Patent Publication Number: US-11643856-B2

Title: Flush handle for vehicle door actuated by a slider

Description:
This application is the national phase entry of international patent application no. PCT/KR2020/000980 filed Jan. 21, 2020 and claims the benefit of Korean patent application No. 10-2019-0007865, filed Jan. 22, 2019, and Korean patent application No. 10-2019-0143506, filed Nov. 11, 2019, the disclosures of which are incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     The present invention relates to a flush handle that is withdrawn from or entered into a vehicle door. 
     BACKGROUND 
     A flush handle for a vehicle door is a handle that is withdrawn from or entered into the outer side of the vehicle door panel in the width direction of the vehicle. 
     A conventional flush handle for a vehicle door is presented in Korean Patent Publication No. 10-2018-0071313. 
     The vehicle door handle of ‘Korean Patent Publication No. 10-2018-0071313’ is connected to the handle support through two links and rotating joints, so that the door lock or door lock function can be mechanically driven. 
     In addition, when an electrical signal is generated by the movement of the vehicle door handle, the door lock or door lock function may be electronically driven. 
     The vehicle door handle of ‘Korean Patent Publication No. 10-2018-0071313’ uses links and a rotating joint, and thus has a problem that the overall volume is large and assembly is difficult to secure a turning radius. 
     Patent Document 1: Korean Patent Publication No. 10-2018-0071313 
     DETAILED DESCRIPTION OF INVENTION 
     Technical Problems 
     The present invention has been made to solve the above-described problems, and an objective thereof is to provide a flush handle for a vehicle door capable of enhancing the assemblability while minimizing the volume of the flush handle for a vehicle door. 
     Technical Solution 
     It is characterized in that a flush handle for a vehicle door of the present invention for achieving the above object comprises: a slider; a handle unit accommodated in the slider; and a linear motion conversion mechanism, sliding the handle unit in an y direction in accordance with a sliding of the slider in an x direction, or sliding the slider in the x direction in accordance with a sliding of the handle unit in the y direction, wherein a lengthwise direction of the vehicle is the x direction, and a widthwise direction of the vehicle is the y direction. 
     It may be characterized in that the linear motion conversion mechanism comprises: a linear motion conversion unit, sliding the slider and the handle unit relatively; and a driving unit, sliding the slider. 
     It may be characterized in that the linear motion conversion unit comprises: an inclined long hole, inclined with respect to the y direction, formed at the slider; and a pin, coupled to the handle unit, and sliding along the inclined long hole. 
     It may be characterized in that the driving unit comprises: a moving nut disposed non-rotatably in the slider; a lead screw fastened to the moving nut; and a power delivery unit delivering a rotational force to the lead screw. 
     It may further comprise a slider return spring returning the slider. 
     It may be characterized in that the slider return spring is installed between the power delivery unit and the slider. 
     It may be characterized in that: the inclined long hole includes a first inclined long hole and a second inclined long hole disposed in the x direction, wherein an inclined direction of the first inclined long hole is parallel to the inclined direction of the second inclined long hole, wherein the pin includes: a first pin sliding in the first inclined long hole, and a second pin sliding in the second inclined long hole, and wherein the handle unit includes: an extension portion, coupled to the first pin, and adjusting a distance between the first pin and an outer surface of the handle unit. 
     It may be characterized by further comprising: an extension portion return spring, returning the extension portion, and wherein a slot positioned in the first pin orthogonal to an direction between the first pin and the outer surface of the handle unit. 
     It may be characterized in that the handle unit is rotatable centered around the second pin, and a pivot unit changing a rotation axis of the handle unit is further installed in the handle unit. 
     It may be characterized—by further comprising: a housing in which the slider is installed, wherein the pivot unit is provided with a pivot pin connected to the handle unit, wherein a distance between the pivot pin and an outer side of the vehicle is smaller than a distance between the second pin and the outer side of the vehicle, and wherein the pivot unit is fixed to the housing by a frictional force with the housing when the handle unit is pressed from the outer side of the vehicle. 
     It may be characterized in that the second inclined long hole includes an entry portion formed in the inner side of the vehicle and a withdrawal portion formed in the outer side of the vehicle, wherein the entry portion of the second inclined long hole has a shape in which the second pin is rotatable with respect to the pivot pin. 
     It may be characterized in that a second pin installation groove into which the second pin is inserted is formed in the handle unit, wherein the second pin installation groove has a shape of an arc centered around the pivot pin. 
     It may be characterized by further comprising: a housing in which the slider is installed is further included, wherein a guide portion in contact with the slider is formed in the housing, the guide portion is elongated in the x direction, and wherein a groove into which the guide portion is inserted is formed in the slider and the moving nut. 
     It may be characterized in that a sensor detecting the moving nut is further installed in the housing, wherein a protrusion that can press the sensor is formed in the moving nut, and wherein the protrusion is disposed outside the slider. 
     It may be characterized by further comprising: a first housing in which the handle unit is installed; and a second housing in which the power delivery unit is installed, wherein the second housing is separated from the first housing. 
     It may be characterized in that the handle unit further includes a button pushing the handle unit into a vehicle door, wherein the button is exposed outside only when the handle unit is withdrawn. 
     It may be characterized by further comprising: a housing in which the slider is installed, wherein the handle unit further includes a button withdrawing the handle unit from the vehicle door, and wherein the button is pressed by the housing when the handle unit is pressed in the y direction. 
     It may be characterized in that the power delivery unit includes: a motor; and an encoder capable of measuring the number of revolutions of the motor. 
     It may be characterized by comprising: a housing in which the slider is installed, wherein a bumper protruded outward from the slide is installed on the slider, and wherein a gap is formed between an outer surface of the slider and an inner surface of the housing due to the bumper. 
     It may be characterized in that the handle unit includes: a rear side handle unit slided by the linear motion conversion mechanism; and a front side handle unit coupled to the rear side handle unit by a pivot pin, wherein the front side handle unit is rotatable centered around the pivot pin. 
     It may be characterized in that the inclined long hole includes a first section and a second section in which the pin passes, the pin moves from the first section to the second section when the handle unit is withdrawn, wherein a slope of the first section is more gradual than a slope of the second section. 
     It may be characterized by further comprising: a plate spring coupled to an outer side of the button, wherein the plate spring is pressed by the housing. 
     It may be characterized by further comprising: a housing in which the slider is installed, wherein a step adjustment bolt is installed in the housing, wherein the step adjustment bolt is disposed in contact with the handle unit, and wherein the handle unit is moved in the y direction when the step adjustment bolt is tightened or loosened. 
     It may be characterized in that a guide groove is formed on an upper surface of the slider and elongated in the x direction, wherein a locking groove is formed on the upper surface of the slider, and connected to an end of the guide groove, wherein a weight balance includes a first arm, wherein the first arm moves between a first position located at the end of the guide groove and a second position located at the locking groove to prevent sliding of the slider in the x direction, and wherein when an impact is applied to the vehicle door, the first arm moves to the second position. 
     It may be characterized by further comprising: a motorized latch unit that is locked or unlocked by the sliding of the slider. 
     It may be characterized by further comprising: a key cylinder manually driving the motorized latch unit. 
     It may be characterized by further comprising: a gear provided with a rotational force of the key cylinder, a gear rod connected to the gear and rotated by the gear, and an insert portion formed at an end of the gear rod and coupled to the motorized latch unit, wherein the insert portion has a shape of a plate, and wherein the motorized latch unit is manually opened when the insert portion rotates. 
     It may be characterized by further comprising a manual latch unit opened by the rotation of the handle unit. 
     It may be characterized characterized by further comprising: a lever delivering the rotational force of the handle unit to the manual latch unit, and a weight balance including a second spring installation portion that can be moved between a first position in an initial state and a second position that can block the operation of the lever, wherein when an impact is applied to the vehicle door, the second spring installation portion is moved from the first postion to the second position. 
     Advantageous Effects of Invention 
     According to a flush handle for a vehicle door of the present invention as described above, it has the following effects. 
     The slider is installed to accommodate the handle unit, thereby making the device compact on the whole. 
     Due to the linear motion conversion mechanism that converts the sliding direction of the slider to the sliding direction of the handle unit, the device does not need to be installed in the same direction as the sliding direction of the handle unit, so the device becomes compact in the width direction of the vehicle. 
     As the slider is slid in the lengthwise direction of the vehicle, the device becomes compact in the height direction of the vehicle. 
     Due to the driving unit, sliding the slider, the handle unit can be withdrawn and entered with motorized movement. 
     Due to the slider return spring that slides the slider, the handle unit can be manually withdrawn and entered. 
     Due to the sliding of the slider, the motorized latch unit can be mechanically and electrically locked or unlocked, so that the electrical malfunction of the motorized latch unit can be prevented. 
     By installing the moving nut included in the driving unit in a state separated from the slider, the slider can be slid independently of the driving unit. Therefore, when a user&#39;s hand is caught in the handle unit, the hand can be removed by pulling the handle unit, thereby enhancing the use safety. 
     The linear motion conversion mechanism comprises a pin installed in an inclined long hole formed in the slider, thereby enhancing the assemblability between the handle unit and the slider. 
     The water tightness of the power delivery unit is enhanced by separating the space where the handle unit is in contact with the outside and the space where the power delivery unit of the driving unit is installed are not connected to each other. 
     A button capable of entering the handle unit is formed on the handle unit, so that the handle unit can be easily entered. The button is disposed at a position that can be pressed only when the handle unit is withdrawn, thereby reducing the inflow of foreign substances through the button and enhancing the user interface. 
     A button capable of withdrawing the handle unit is formed at the rear side of the handle unit, so that a user can easily withdraw the handle unit by pressing the handle unit inward. 
     By installing a bumper on the outer side of the slider, it is possible to reduce noise generated between the slider and the housing on which the slider is installed and the blocking plate when the slider is being slid. 
     Since a motorized latch or a manual latch can be used, a latch can be selected according to the requirements of a user. 
     By further comprising a key cylinder that can manually unlock the motorized latch or the manual latch, a user can open or close the vehicle door in various ways. 
     By connecting the motorized latch or the manual latch and the key cylinder through a gear, it is possible to respond to a key mounting position that is changed according to the exterior design of the vehicle, and the rotational force of the key that turns the key cylinder can be delivered to the motorized latch or the manual latch more efficiently. 
     When the manual latch is used, by comprising a lever that delivers the rotational force of the handle unit to the manual latch unit and a weight balance that is moved to a position where the operation of the lever can be prevented by an impact when the impact is applied to the vehicle door, a situation where the vehicle door is being opened by an external impact can be prevented. 
     When the manual latch is used, by comprising a weight balance that is moved to a position where the sliding of the slider can be blocked by an impact when the impact is applied to the vehicle door, a situation where the vehicle door is opened by an external impact can be prevented. 
     The handle unit is separated into a rear side handle unit that is slid by a linear motion conversion mechanism, and a front side handle unit that is pin-coupled with the rear side handle unit and capable of pulling operation, so that it can be stably driven without tangling between the sliding and pulling operations. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  2    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention (excluding housing and blocking plate). 
         FIG.  3    is a rear perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  4    is a rear perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention (excluding the housing and blocking plate). 
         FIG.  5    is a front exploded perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  6    is a front perspective view of the housing of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  7    is a rear perspective view of the housing of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  8    is a front exploded perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  9    is an exploded rear perspective view of a handle unit of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  10    is a front perspective view of the handle cover of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  11    is a rear perspective view of the handle cover of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  12    is a front perspective view of a bumper member of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  13    is a front perspective view of a slider of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  14    is a rear perspective view of a slider of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  15    is a front perspective view of a driving unit of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  16    is a rear exploded perspective view of a driving unit of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  17    is a front perspective view of a blocking plate of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  18    is a rear perspective view of a blocking plate of a flush handle for a vehicle door according to a first preferred embodiment of the present invention. 
         FIG.  19    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state where the handle is lifted. 
         FIG.  20    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state where the handle is being lifted (excluding the housing and blocking plate). 
         FIG.  21    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being withdrawn. 
         FIG.  22    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being withdrawn manually (excluding the housing and blocking plate). 
         FIG.  23    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state being withdrawn motorizedly (excluding the housing and blocking plate). 
         FIG.  24    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being pulled. 
         FIG.  25    is a front perspective view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being pulled (excluding the housing and blocking plate). 
         FIG.  26    is a cross-sectional view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being entered. 
         FIG.  27    is a cross-sectional view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state where the handle is being lifted. 
         FIG.  28    is a cross-sectional view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being withdrawn. 
         FIG.  29    is a cross-sectional view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being withdrawn motorizedly. 
         FIG.  30    is a cross-sectional view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being pulled. 
         FIG.  31    is a front view of a flush handle for a vehicle door according to the first preferred embodiment of the present invention in a state of being entered (excluding the housing). 
         FIG.  32    is a right side view of a latch of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being entered. 
         FIG.  33    is a left side view of a latch of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being entered. 
         FIG.  34    is a front view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state of being withdrawn motorizedly (excluding the housing). 
         FIG.  35    is a right side view of a latch of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state being withdrawn motorizedly. 
         FIG.  36    is a left side view of a latch a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state in which a motorized door open function is activated after withdrawn motorizedly. 
         FIG.  37    is a front view of a flush handle for a vehicle door according to a first preferred embodiment of the present invention in a state which an motorized door opening function is activated after being withdrawn manually (excluding the housing). 
         FIG.  38    is a rear perspective view of a flush handle for a vehicle door according to a second preferred embodiment of the present invention (excluding the housing and blocking plate). 
         FIG.  39    is a rear perspective view of a housing of a flush handle for a vehicle door according to a second preferred embodiment of the present invention. 
         FIG.  40    is a rear exploded perspective view of a handle unit of a flush handle for a vehicle door according to a second preferred embodiment of the present invention. 
         FIG.  41    is a front exploded perspective view of a driving unit of a flush handle for a vehicle door according to a second preferred embodiment of the present invention. 
         FIG.  42    is a rear exploded perspective view of a driving unit of a flush handle for a vehicle door according to a second preferred embodiment of the present invention. 
         FIG.  43    is a cross-sectional view of a flush handle for a vehicle door according to a second preferred embodiment of the present invention in a state of being entered. 
         FIG.  44    is a cross-sectional view of a flush handle for a vehicle door according to a second preferred embodiment of the present invention in a state where the handle is being lifted. 
         FIG.  45    is a front perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  46    is a front perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention (excluding the housing and blocking plate) 
         FIG.  47    is a rear perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  48    is a rear perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention (excluding the housing and blocking plate) 
         FIG.  49    is a front exploded perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  50    is a front perspective view of a first housing of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  51    is a rear perspective view of a first housing of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  52    is a front exploded perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  53    is a rear exploded perspective view of a handle unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  54    is a rear perspective view of a handle unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  55    is a front perspective view of a bumper member of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  56    is a front exploded perspective view of a slider of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  57    is a rear exploded perspective view of a slider of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  58    is a front perspective view of a first blocking plate of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  59    is a rear perspective view of a first blocking plate of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  60    is a front perspective view of a second housing of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  61    is a rear perspective view of a second housing of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  62    is a front perspective view of a second blocking plate of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  63    is a rear perspective view of a second blocking plate of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  64    is a front perspective view of a driving unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  65    is a front exploded perspective view of a driving unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  66    is a rear exploded perspective view of a driving unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  67    is a front perspective view of a key lock unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  68    is a rear exploded perspective view of a key lock unit of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  69    is a front perspective view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  70    is a partial front view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention in a state of being entered (excluding the housing and blocking plate) 
         FIG.  71    is a partial front view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention in a state of being withdrawn (excluding the housing and blocking plate) 
         FIG.  72    is a partial rear view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention in a state of being entered (excluding the housing and blocking plate) 
         FIG.  73    is a partial rear view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention in a state of being withdrawn (excluding the housing and blocking plate) 
         FIG.  74    is a partial cross-sectional view of a flush handle for a vehicle door according to a third preferred embodiment of the present invention. 
         FIG.  75    is a front view and a perspective view of a motor of a flush handle for a vehicle door according to a fourth preferred embodiment of the present invention. 
         FIG.  76    is a front perspective view of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention. 
         FIG.  77    is a rear perspective view of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention. 
         FIG.  78    is a front perspective view of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention in a state of being entered (excluding the housing, blocking plate). 
         FIG.  79    is a front perspective view of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention in a state of being pulled after being withdrawn (excluding the housing, blocking plate). 
         FIG.  80    is a front exploded perspective view of a lever and a weight balance of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention. 
         FIG.  81    is a rear exploded perspective view of a lever and a weight balance of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention. 
         FIG.  82    is a plan view of the enter state of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention (excluding the cover). 
         FIG.  83    is a plan view of a flush handle for a vehicle door according to a fifth preferred embodiment of the present invention in a state of being pulled after being withdrawn. 
         FIG.  84    is a plan view when a handle unit of a flush handle for a vehicle door according to the fifth preferred embodiment of the present invention is withdrawn due to an external impact (excluding the cover). 
         FIG.  85    is a front perspective view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  86    is a front perspective view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention (excluding the housing, blocking plate). 
         FIG.  87    is a rear perspective view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  88    is a rear perspective view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention (excluding the housing, blocking plate). 
         FIG.  89    is a front perspective view of a first housing of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  90    is a rear perspective view of a first housing of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  91    is a front exploded perspective view of a handle unit of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  92    is an exploded perspective view of a rear surface of a handle unit of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  93    is a front perspective view of a rear side handle unit of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  94    is a rear perspective view of a rear side handle unit of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  95    is a rear perspective view of a slider of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  96    is a plan view of a slider of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  97    is a front perspective view of a first blocking plate of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  98    is a rear perspective view of a first blocking plate of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  99    is a front perspective view of a driving unit of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  100    is an exploded perspective view of a weight balance of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  101    is a state diagram when a weight balance of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention is in the first position. 
         FIG.  102    is a state diagram when a weight balance of a flush handle for a vehicle door according to the sixth preferred embodiment of the present invention is in the second position. 
         FIG.  103    is an assembly diagram of a step adjustment bolt of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention. 
         FIG.  104    is a cross-sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being entered. 
         FIG.  105    is a sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention when the handle is in a state of being lifted. 
         FIG.  106    is a cross-sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being pulled after being withdrawn. 
         FIG.  107    is a cross-sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being entered. 
         FIG.  108    is a cross-sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being withdrawn. 
         FIG.  109    is a sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being pulled 5 degrees. 
         FIG.  110    is a cross-sectional view of a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention in a state of being pulled 10 degrees. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     For reference, for the same configuration as the prior art among the configurations of the present invention to be described hereinafter, reference will be made to the above mentioned prior art, and a separate detailed description will be omitted. 
     The terms used herein are for reference only to specific embodiments and are not intended to limit the invention. The singular forms used herein comprise plural forms unless the phrases clearly indicate the opposite meaning. 
     As used herein, the meaning of “comprising” embodies specific features, areas, integers, steps, actions, elements and/or components, but it does not exclude the presence or addition of other specific features, areas, integers, steps, actions, elements, components and/or groups. 
     In a preferred embodiment of the present invention, the front-to-rear side means the lengthwise direction of the vehicle, the up-and-down direction means the widthwise direction of the vehicle, and the left-to-right direction means the vertical direction of the vehicle. 
     Embodiment 1 
     As illustrated in  FIGS.  1  to  5   , a flush handle for a vehicle door according to a first preferred embodiment of the present invention comprises: a housing  1100 ; a slider  1600  installed in the housing  1100 ; a handle unit  1200  accommodated in the slider  1600 ; and a linear motion conversion mechanism, sliding the handle unit  1200  in the front-to-rear direction in accordance with a sliding of the slider  1600  in the left-to-right direction, or sliding the slider  1600  in the left-to-right direction in accordance with a sliding of the handle unit  1200  in the front-to-rear direction. 
     The linear motion conversion mechanism comprises: a linear motion conversion unit for supporting the relative sliding between the slider  1600  and the handle unit  1200 ; and a driving unit  1700 , sliding the slider  1600 . 
     The linear motion conversion unit comprises: first and second inclined long holes  1601  and  1602  formed in the slider  1600 , and first and second pins  1301  and  1302  installed in the handle unit  1200  to be slid along the first and second inclined long holes  1601  and  1602 . 
     Hereinafter, each configuration will be described in detail with reference to  FIG.  5   . 
     &lt;Housing&gt; 
     The housing  1100  is illustrated in detail in  FIGS.  6  to  7   . 
     The housing  1100  is formed, on the whole, in the shape of a cuboid with open rear and left sides. That is, it is composed of a front surface portion and a circumferential portion formed to be protruded rearward from the circumference of the front surface portion. 
     A handle unit  1200  and a slider  1600  are disposed at a central portion of the housing  1100 , a driving unit  1700  is disposed at a right side portion of the housing  1100 , and a key cylinder  1900  is disposed at a left side portion of the housing  1100 . 
     In the housing  1100 , a handle unit through hole  1101  is formed to be long from the central portion to the left side portion of the housing  1100 . The handle unit through hole  1101  is formed as the shape of the front portion of the handle unit  1200 , and in the first embodiment, formed in the shape of a rectangle with arc-shaped left and right sides to be penetrated through the front-to-rear direction. The handle unit through hole  1101  is formed larger than the front portion of the handle unit  1200  so that the interference between the handle unit through hole  1101  and the handle unit  1200  is prevented. 
     A first guide portion  1102  and a second guide portion  1105  are formed to be protruded inward in the upper and lower portions of the circumferential portion of the housing  1100 . 
     The first guide portion  1102  is disposed at the left and right sides of the handle unit through hole  1101 , and the first and second pins  1301  and  1302  inserted into the handle unit  1200  and the slider  1600  guide the sliding of the slider  1600 . 
     The first guide portion  1102  is divided into two portions, a left and a right side portions. The right side of the first guide portion  1102  is formed in a straight line extending straight in the front-to-rear direction, and the rear side portion of the left side of the first guide portion  1102  is formed in a straight line inclined leftward as it travels from front to rear. 
     Due to this first guide portion  1102 , a space is secured to which the handle unit  1200  is movable rightward when rotating counterclockwise along the turning radius while the first and second pins  1301  and  1302  are located in the rear side, and when they are located in the front side, it can be slid in the front-to-rear direction. 
     The second guide portion  1105  is disposed at the center of the handle unit through hole  1101  and guides the sliding of the slider  1600 . 
     The second guide portion  1105  formed on the upper portion is formed in the form of a straight line extending straight in the front-to-rear direction, and the second guide portion  1105  formed in the lower portion is in the form of a letter ‘¬’, on the whole, and formed in a shape in which a second straight line portion that runs continuous in the downward direction is connected at the rear direction of a first straight line portion that runs continuous in the front-to-rear direction. 
     A groove is formed to be open rearward in the second straight line portion, and a door latch connection portion  30 , which will be described later, is fitted. 
     The left portion of the second guide portion  1105  formed in the lower portion of the housing  1100  is formed to be protruded downward. A door latch connection portion penetrating groove  1104  is formed to be open rearward and to be penetrated through the up-down direction in the lower left of the protruded space, and thereby a portion of the door latch connection portion  30  is installed. 
     In the lower right portion of the housing  1100 , two third sensor installation grooves  1103  are formed to be spaced apart from each other in the left-to-right direction. The third sensor installation groove  1103  is formed in a way that a rim of a rectangular shape having a partially open upper portion is protruded rearward. Due to this, third sensors  23   a  and  23   b  are installed in the rear-to-front direction in the third sensor installation groove  1103 , and pressed through the open portion. 
     In the right center of the housing  1100 , three third guide portions  1106  are formed to be protruded rearward. The third guide portion  1106  is disposed on the right side of the handle unit through hole  1101 . 
     The third guide portion  1106  is formed long in the left-to-right direction, and the lengths of the widths of the left and center portions are formed wider than the lengths of the widths of the right side. Lead screw installation grooves  1131  are formed in the rear direction of the left side and center, and bumper installation grooves  1136  are formed in the rear direction of the right side. 
     In addition, the length of the front-to-rear width of the third guide portion  1106  disposed in the middle portion in the up-down direction is narrower than the length of the front-to-rear width of the third guide portion  1106  disposed in the upper and lower portions. Due to this, the middle portion and the upper and lower portions of each of the lead screw  1724  installed in a lead screw installation groove  1131 , which will be described later, a slider return spring  1730  disposed surrounding a lead screw  1724 , and a bumper  1740  installed in the bumper installation groove  1136  can be guided by the third guide portion  1106 . 
     The front outer side of the housing  1100  is coupled with a bumper member  1500 , which will be described later. A first bumper fastening portion  1113  capable of fastening bolts is formed on the left and right sides centered around the handle unit through hole  1101 . A plurality of second bumper fastening portions  1114  is formed on the upper side and the lower side around the handle unit through hole  1101 . The left and right sides, with respect to the central portion, of the second bumper fastening portion  1114  is formed recessed toward the direction of the handle unit through hole  1101 . Between the first bumper fastening portion  1113  and the second bumper fastening portion  1114  and between the second bumper fastening portion  1114  and the second bumper fastening portion  1114 , a third bumper fastening portion  1115  has a shape of a cylindrical column protruded forward. Due to this, the housing  1100  and the bumper member  1500  may be more firmly coupled. 
     The right side of the housing  1100  is formed to be protruded downward. 
     In the lower right side of the housing  1100 , a first motor installation groove  1121  is formed to be open rearward. 
     In the upper portion of the first motor installation groove  1121 , a worm gear installation groove  1122  is formed to be open rearward. 
     The first motor installation groove  1121  is disposed at the right side of the third guide portion  1106 . Between the first motor installation groove  1121  and the third guide portion  1106 , a lead screw penetrating portion  1132  is formed long in the up-down direction in a way that the upper and lower portions of the lead screw penetrating portion  1132  are connected to the circumferential portion of the housing  1100 . 
     The right and lower sides of the first motor installation groove  1121  are blocked by the circumference of the housing  1100 , the upper side of the first motor installation groove  1121  is blocked by a partition formed between the first motor installation groove  1121  and the worm gear installation groove  1122 , and the left side of the first motor installation groove  1121  is blocked by the lead screw penetrating portion  1132 . 
     In the lead screw penetrating portion  1132 , a groove is formed to be open rearward, and thereby the right side of the lead screw  1724  is installed. 
     In the lower portion of the first motor installation groove  1121 , a first motor support portion  1124  is formed to be protruded upward. A portion of the lower portion of the motor  1710  inserted into the first motor installation groove  1121  is supported by being inserted between the first motor support portion  1124 . 
     In the lower portion of the worm gear installation groove  1122 , a groove is formed to be open rearward and to be penetrated through the up-down direction, so that the worm  1721  formed in the upper portion of the motor  1710  is installed in the worm gear installation groove  1122  through the groove. 
     In the upper portion of the worm gear installation groove  1122 , a first motor shaft installation portion  1123 , in which a groove is formed to be open rearward and downward, is formed, and thereby the upper portion of the worm  1721  is installed. 
     In the right side of the worm gear installation groove  1122 , a lead screw installation portion  1133  in which a groove is formed to be open rearward, is formed, and thereby the right side of the axis of the lead screw  1724  is installed. 
     In the right side of the periphery of the housing  1100 , a lead screw support  1134  is formed to be protruded leftward. The lead screw support portion  1134  is disposed at the right side of the lead screw installation portion  1133 . The right end of the lead screw  1724  is supported by the lead screw support portion  1134  so that the lead screw  1724  does not move further rightward. 
     Between the third guide portion  1106  and the handle unit through hole  1101 , a lead screw installation portion  1135  is formed to be protruded rearward. The right side of the lead screw installation portion  1135  is formed to be flat so that the lead screw  1724  does not move further leftward. In addition, the left side of the lead screw installation portion  1135  has a shape of an arc convex on the right side, and thereby the interference between the lead screw installation portion  1135  and the handle unit  1200  is prevented. 
     In the center of the lead screw installation portion  1135 , a groove is formed to be penetrated through the left-to-right direction, and thereby the left side of the axis of the lead screw  1724  is installed. 
     In the lower right portion of the circumferential portion of the housing  1100 , a wire penetrating groove  1141  is formed to be penetrated through the up-down direction. The wire penetrating groove  1141  is disposed between the third sensor installation grooves  1103 . 
     Between the third sensor installation grooves  1103 , a wire guide portion  1142  is formed to be protruded rearward, and the third sensor installation groove  1103  at the left side and the third sensor installation groove  1103  at the right side are connected by the wire guide portion  1142 . 
     Due to this, a wire  20  is inserted into the housing  1100  through the wire penetrating groove  1141 , and some of the wires  20  is connected to third sensors  23   a  and  23   b  through the lower portion of the wire guide portion  1142 . 
     In the circumferential portion of the housing  1100 , a first fastening portion  1151  and a second fastening portion  1152  coupled with a blocking plate  1800  are formed. 
     The first fastening portion  1151  is formed in a form comprising a groove through which the bolt can be inserted from rear to front. A portion of the first fastening portion  1151  is formed to be protruded outward in a portion of the right, upper, and lower side surfaces of the circumferential portion of the housing  1100 , and the rest of the first fastening portion  1151  is formed to be protruded rearward in the left side of the housing  1100  and in the right side of the door latch connection portion penetrating groove  1104 . 
     In the upper and lower side surfaces of the circumferential portion of the housing  1100 , a second fastening portion  1152  is formed to be protruded outward. The second fastening portion  1152  has a shape of a protrusion inclined inward as it travels from front to rear. 
     In the circumferential portion of the housing  1100 , a third fastening portion  1153  that is coupled with the door panel is formed. 
     In the upper and lower side surfaces of the circumferential portion of the housing  1100 , a third fastening portion  1153  is formed to be protruded outward. In the third fastening portion  1153 , a groove is formed to be penetrated through the front-to-rear direction, and is coupled to the door panel through the groove. A metal pad  1154  in the shape of a donut is installed in the groove to prevent the coupling portion between the housing  1100  and the door panel from being damaged and loosened. 
     &lt;Handle Unit&gt; 
     The handle unit  1200  is illustrated in detail in  FIGS.  8  to  9   . 
     The handle unit  1200  is formed in a shape in which the left and right sides of a rectangle are protruded rearward, on the whole. The handle unit  1200  comprises a handle unit main body  1220  corresponding to the rectangle, a left side portion  1230  of the handle unit corresponding to the protruding portion, and a right side portion  1240  of the handle unit. 
     In the left side portion of the handle unit  1200 , an extension portion installation groove  1201  has a shape of a rectangle to be penetrated through the front-to-rear direction, and in the right side portion of the handle unit  1200  a pivot unit installation groove  1202  has a shape of a rectangle to be penetrated through the front-to-rear direction. 
     The left and right and up-down directions of the extension portion installation groove  1201  and the pivot unit installation groove  1202  are blocked by the handle unit  1200 . Due to this, an extension portion  1310 , which will be described later, is moved along the extension portion installation groove  1201  within the extension portion installation groove  1201 , and the pivot unit  1320  is rotated centered around a third pin installation groove  1214  or a pivot pin  1327  within the pivot unit installation groove  1202 . 
     In the lower portion in front of the pivot unit installation groove  1202 , an LED installation groove  1203  is formed to be penetrated through the up-down direction. In the LED installation groove  1203  the lower portion of the LED  24 , which will be described later, is inserted, so that when the handle unit  1200  is withdrawn, a user can check the light of the LED  24  from the outside of the handle unit  1200 . 
     In the left side of the pivot unit installation groove  1202 , a wire penetrating groove  1242  is formed to be penetrated through the left-to-right direction. The wire  20  connected to the outside through a wire insertion groove  1801  of a blocking plate  1800 , which will be described later, is connected to each sensor of the handle unit  1200  through the wire penetrating groove  1242 , and some of them are connected to the LED  24 . 
     In the front surface of the handle unit main body  1220 , a handle cover installation portion  1210  is formed. The handle cover installation portion  1210  is formed to be extended further leftward than the handle unit main body  1220 . The handle cover installation portion  1210  comprises a rear surface panel formed in the shape of a rectangle having an arc-shaped left and right sides in accordance with the shape of the handle unit through hole  1101  and a circumferential portion formed protruded rearward at a place inwardly apart a predetermined interval from the circumference of the rear plate. 
     In a central portion of the handle cover installation portion  1210 , a button sensor installation groove  1211  and a wire installation portion  1212  are formed. 
     The button sensor installation groove  1211  is formed to be open forward, and thereby a button  25  and a button sensor  26  are installed. The button  25  is disposed at the front direction of the button sensor  26 , and when the button  25  is pressed from front to rear, the button sensor  26  is pressed. The button  25  and the button sensor  26  are illustrated in detail in  FIG.  10   . 
     The wire installation portion  1212  is formed to be open in the front and left and right directions, and thereby the wire  20  entered through the pivot unit installation groove  1202  is installed. The wire  20  is connected to the button sensor  26  through the wire installation portion  1212 . 
     In the up, down, left, and right sides of the circumferential portion of the handle cover installation portion  1210 , a handle cover fastening portion  1213  in the shape of a hook is formed to be protruded outward of the circumferential portion of the handle cover installation portion  1210 . The handle cover fastening portion  1213  comprises a protrusion formed inclined further outward of the handle cover installation portion  1210  as it travels from front to rear, and grooves formed to be penetrated through the inward-outward directions at both sides of the protrusion to allow elastic deformation of the both sides of the protrusion. 
     Due to this, the handle cover  1400 , which will be described later, is installed on the outer surface of the circumferential portion of the handle cover installation portion  1210 . 
     In the upper and lower portions of the right side of the circumferential portion of the handle cover installation portion  1210 , a third pin installation groove  1214  is formed to have an open front and to be penetrated through the up-down direction. 
     In the center of the handle unit main body  1220 , a first through hole  1221  is formed to be penetrated through the up-down direction. The first through hole  1221  has a shape of a rectangle with rounded corners. The first through hole  1221  is formed large enough to allow a user&#39;s hand to be inserted, so that the user can pull the handle unit  1200  by putting a hand in the first through hole  1221 . At this time, due to the shape of the first through hole  1221 , the user&#39;s grip feeling is enhanced. 
     In the rear surface of the handle unit main body  1220 , a wire installation portion  1222  is formed to be protruded rearward. The wire installation portion  1222  is formed to be bent upward or downward after being extended rearward. 
     The wire installation portion  1222  formed to be bent upward and the wire installation portion  1222  formed to be bent downward are alternately disposed so that installation of the electric wire  20  is easy, and, at the same time, the wire  20  is prevented from being flowed in the up-down direction. 
     The wire  20  connected to the outside through the wire insertion groove  1801  of the blocking plate  1800 , which will be described later, is connected to a second sensor  22  installed in the left rear direction of the handle unit  1200  through the wire installation portion  1222 . 
     In the front direction of the handle unit left side portion  1230 , a partition wall is formed, and a circular groove to be penetrated through the front-to-rear direction is formed in the partition wall. The groove is in communication with the extension portion installation groove  1201 . 
     The handle unit left side portion  1230  is formed to be open rearward. 
     The handle unit left side portion  1230  comprises a first pin installation groove  1231  formed to be penetrated through the up-down direction. 
     In the right side of the handle unit left side portion  1230 , a second sensor installation groove  1232  is formed to be protruded outward. In the left side of the second sensor installation groove  1232 , a groove is formed to be protruded rearward, so that the second sensor installation groove  1232  and the extension portion installation groove  1201  are in communication with each other. Due to this, the second sensor  22  installed in the second sensor installation groove  1232  is pressed through the groove by an extension portion  1310 , which will be described later. 
     The right side portion  1240  of the handle unit is formed such that the rear side is inclined further forward as it travels from left to right. Due to this, when the handle unit  1200  is rotated counterclockwise centered around the right side portion  1240  of the handle unit, the blocking plate  1800  installed in the rear surface of the handle unit  1200  and the housing  1100  is prevented from being interfered. 
     In the left side of the right portion  1240  of the handle unit, a second pin installation groove  1241  is formed to be penetrated through the up-down direction. The handle unit  1200  is connected to the slider  1600  by a second pin  1302  inserted into the second pin installation groove  1241 . 
     &lt;Extension Portion&gt; 
     An extension portion  1310  is illustrated in detail in  FIGS.  8  to  9   . 
     The extension portion  1310  is installed in the left side of the handle unit  1200  so as to be adjustable in length with respect to the first pin  1301 . 
     The extension portion  1310  comprises a head portion  1311  formed in the shape of a cylindrical column with rounded corners, and a length portion  1313  formed in the shape of a cylindrical column in the rear side of the head portion  1311 . The length of the diameter of the length portion  1313  is formed to be smaller than the length of one side of the head portion  1311 . 
     The head portion  1311  is formed to be open rearward, and an extension portion return spring insertion groove  1312  is formed between the inner surface of the head portion  1311  and the outer surface of the length portion  1313 . 
     In the rear of the length portion  1313 , a second sensor anti-pressing portion  1314  is formed in a way that the left side surface and right side surface thereof are inclined further toward the center of the length portion  1313  as they travel from front to rear. The second sensor  22  is disposed at the right side of one second sensor anti-pressing portion  1314 , but it is possible to further enhance the assemblability by forming the second sensor anti-pressing portion  1314  on both left and right sides. 
     In the rear of the length portion  1313 , a slot  1315  is formed to be penetrated through the up-down direction. The slot  1315  is formed long in the left-to-right direction. 
     An extension portion return spring  1316  is fitted in the outer side of the length portion  1313 . 
     The extension portion  1310  is fitted from front to rear of the handle unit  1200 . The rear direction of the extension portion  1310  is blocked by a partition wall formed in the front direction of the left side portion  1230  of the handle unit. 
     At this time, the front direction of the extension portion return spring  1316  is fitted into the extension portion return spring insertion groove  1312 , and the rear direction is blocked by a partition formed in front direction of the left side portion  1230  of the handle unit, and thereby it is compressed and restored in the front-to-rear direction between the extension portion return spring insertion groove  1312  and the partition wall depending on the movement of the handle unit  1200 . 
     After the assembly, the first pin  1301  is fitted into the slot  1315  of the extension portion  1310  protruding rearward of the handle unit  1200  and the first inclined long hole  1601  of the slider  1600 . Due to this, the left side portion of the handle unit  1200  is connected to the slider  1600 . 
     At this time, due to the shape of the slot  1315 , the first pin  1301  freely slides along the slot  1315  when the handle unit  1200  is rotated. Due to this, the handle unit  1200  can be rotated while keeping the width of the first inclined long hole  1601  constant. 
     &lt;Pivot Unit&gt; 
     A pivot unit  1320  is illustrated in detail in  FIGS.  8  to  9   . 
     The pivot unit  1320  is installed in the right side of the handle unit  1200  in a way that the rotation axis of the handle unit  1200  can be changed. 
     The pivot unit  1320  comprises: a rotating shaft  1321  in the shape of a cylindrical column disposed in the up-down direction; a rotating portion  1322  that is formed to be extended rearward from the upper portion and the lower portion of the rotating shaft  1321  with respect to the rotating shaft  1321 , a pivot unit return spring installation portion  1325  connecting the upper rotating portion  1322  and the lower rotating portion  1322  to each other, and a reinforcement portion  1326 . 
     The diameter of the central portion of the rotating shaft  1321  is formed smaller than the diameters of the upper and lower portions of the rotating shaft  1321 . The rotating shaft  1321  may be detachably assembled to the pivot unit  1320 . A pivot unit return spring  1324  is wound on the outer side of the rotating shaft  1321 . Due to the shape of the rotating shaft  1321 , the pivot unit return spring  1324  will not be separated along the up-down direction. 
     A groove is formed in the center of the rotating shaft  1321  to be penetrated through the up-down direction. A pivot pin  1327  is inserted into the groove. The length in the height direction of the pivot pin  1327  is formed to be longer than the length in the height direction of the rotating shaft  1321 , and after installation, a portion of the upper and lower portions of the pivot pin  1327  is protruded outward of the rotating shaft  1321 . 
     The rotating portion  1322  is formed in the form of a plate being extended in the front-to-rear direction. In the rotating portion  1322 , the rear end of the rotating portion  1322  is formed long enough to be in contact with a pivot unit engaging portion  1803  of the blocking plate  1800 , which will be described later, when the handle unit  1200  is entered. 
     In the left side of the rear side of the rotating portion  1322 , a second pin engagement prevention groove  1323  is formed concavely. When the left side surface of the rotating portion  1322  is in contact with the inner surface of the pivot unit installation groove  1202  of the handle unit  1200 , the second pin  1302  is positioned in the second pin engagement prevention groove  1323 . 
     The pivot unit return spring installation portion  1325  has a shape of a rectangular plate and a wide surface is disposed to be facing the left-to-right direction. The pivot unit return spring installation portion  1325  is disposed behind the rotating shaft  1321 . 
     One side of the pivot unit return spring  1324  is in contact with the rear surface of the handle cover  1400 , which will be described later, and the other side is in contact with the right side surface of the pivot unit return spring installation portion  1325 . The pivot unit return spring  1324  is wound clockwise centered around the one side. That is, due to the pivot unit return spring  1324 , the pivot unit  1320  receives an elastic force in the counterclockwise direction centered around the rotating shaft  1321 . 
     The reinforcement portion  1326  is formed in the form of a rectangular plate and a wide surface is disposed in a way to face the front-to-rear direction. The reinforcement portion  1326  is disposed at the rear direction of the pivot unit return spring installation portion  1325 . Due to the reinforcement portion  1326 , the pivot unit  1320  can be reduced in weight while maintaining the rigidity. 
     The pivot unit  1320  is installed from front to rear of the handle unit  1200 . The front side of the pivot unit  1320  is then blocked by the handle cover  1400  being installed in the front side of the handle unit  1200 , and will not be flowed in the rear side by the pivot pin  1327  whose upper and lower portions are installed in the third pin installation groove  1214  of the handle unit  1200 . 
     &lt;Handle Cover&gt; 
     A handle cover  1400  is illustrated in detail in  FIGS.  10  to  11   . 
     The handle cover  1400  has a shape of a rectangle with left and right sides having an arc-shaped left and right sides in accordance with the shape of the handle cover installation portion  1210  of the handle unit  1200 . The handle cover  1400  is formed to be open rearward. 
     In the left side of the handle cover  1400 , a button installation groove  1401  is installed to be penetrated through the front-to-rear direction. The button installation groove  1401  is disposed at the front direction of the button sensor installation groove  1211  of the handle unit  1200 . A portion of the button  25  is installed so as to be inserted into the button installation groove  1401 , and a user can press a portion of the button  25 . 
     In the upper and lower portions of the right side of the handle cover  1400 , a third pin support portion  1402  is formed to be protruded rearward. 
     The third pin support portion  1402  has a shape of a letter ‘T’. The end of the vertical side in the letter ‘T’ is formed to be connected to the inner surface of the handle cover  1400 , and the other end is protruded further rearward than the remaining portion, so as to be in contact with the upper and lower portions of the pivot pin  1327 . Due to this, the pivot pin  1327  will not be flowed in the forward direction. 
     In the left side of the handle cover  1400 , an extension portion support portion  1403  is formed to be protruded rearward. The rear surface of the extension portion support portion  1403  is in contact with the front surface of the extension portion  1310 . 
     In the top, bottom, left, and right of the handle cover  1400 , a handle fastening portion  1404  in the form of a hook is formed to be protruded inward. The handle fastening portion  1404  is formed to be inclined further outward as it travels from front to rear. 
     When assembling the handle cover  1400 , the inclined portion of the handle fastening portion  1404  of the handle cover  1400  pushes the inclined portion of the handle cover fastening portion  1213  of the handle unit  1200  so that the handle cover fastening portion  1213  can be gradually elastically deformed. 
     &lt;Bumper Member&gt; 
     A bumper member  1500  is illustrated in detail in  FIG.  12   . 
     In the center portion of the bumper member  1500 , a handle through hole  1501  through which the handle unit  1200  and the handle cover  1400  are slid is formed to be penetrated through the front-to-rear direction. The handle through hole  1501  has a shape of a rectangle having an arc-shaped left and right sides in accordance with the shape of the front side of the handle unit  1200  and the shape of the handle cover  1400 . 
     The shape is composed of multiple stages, and the size of the shape increases as it travels from rear to front of the bumper member  1500 . Due to this, a handle cover installation groove  1502  has a shape of a step between the handle through hole  1501  formed at the rear direction of the bumper member  1500  and the handle through hole  1501  formed in the front direction. Due to the handle cover installation groove  1502 , manual manipulation of the handle unit  1200  becomes easier, and the insertion of a key into the key cylinder  1900  becomes smoother. 
     The rear direction of the bumper member  1500  is coupled with the front surface of the housing  1100 . In the left and right sides of the handle through hole  1501 , a first housing fastening portion  1503  capable of fastening bolts is formed. In the upper side and the lower side with respect to the handle through hole  1501 , a plurality of second housing fastening portions  1504  is formed. The second housing fastening portion  1504  is formed to be extended rearward, and a groove through which the central portion of the second bumper fastening portion  1114  of the housing  1100  can be inserted is formed to be penetrated through the up-down direction. Between the first housing fastening portion  1503  and the second housing fastening portion  1504 , and between the second housing fastening portion  1504  and the second housing fastening portion  1504 , a groove wherein the third bumper fastening portion  1115  of the housing  1100  may be inserted is formed to be penetrated through the front-to-rear direction. Due to this, the bumper member  1500  and the housing  1100  may be more firmly coupled. 
     Due to the bumper member  1500 , the housing  1100  is not directly in contact with the door panel and is protected from an external impact, and also performs a function of dustproofing and waterproofing to prevent contaminants or moisture from entering the housing  1100  from the outside. 
     &lt;Slider&gt; 
     A slider  1600  is illustrated in detail in  FIGS.  13  to  14   . 
     The slider  1600  comprises an upper surface  1610  and a lower surface  1620  formed to be extended leftward from both upper and lower ends of a right surface  1630  and a right surface  1630 . That is, the slider  1600  is formed to be open leftward, forward, and rearward, so that the handle unit  1200  can be accommodated in the space. 
     The upper surface  1610  and the lower surface  1620  are formed, on the whole, in the form of a rectangular plate. The left side of the upper surface  1610  and the lower surface  1620  is formed to be inclined further rightward as they travel from front to rear, and in the right side, a housing interference prevention portion  1607  is formed to have an open front and right side. The left side surfaces of the housing interference prevention portion  1607  are formed parallel to the left side surfaces of the upper surface  1610  and the lower surface  1620 . 
     Due to this, a space in the left rear direction of the slider  1600  is secured, so that the key cylinder  1900  can be installed. In addition, when the slider  1600  is slid rightward, in the line where the slider  1600  and the housing  1100  are not interfered, the front-to-rear gap of the right side of the housing  1100  can be formed as compact as possible. 
     The first and second inclined long holes  1601  and  1602  are formed in the up-down directions in the left and right sides of the upper surface  1610  and the lower surface  1620 . The first and second inclined long holes  1601  and  1602  are formed parallel to the left side surfaces of the upper surface  1610  and the lower surface  1620 . 
     The first inclined long hole  1601  is formed on the left side of the slider  1600 , and the second inclined long hole  1602  is formed on the right side of the slider  1600 . 
     The first inclined long hole  1601  is formed to have the same width from the front direction up to the rear direction. The width is formed similar to or slightly larger than the size of the diameter of the first pin  1301 . 
     The second inclined long hole  1602  comprises an entry portion formed in the rear direction of the second inclined long hole  1602  and a withdrawal portion formed in the front direction of the second inclined long hole  1602 . 
     The width of the withdrawal portion is similar to or slightly larger than the diameter of the second pin  1302 . 
     The left side surface of the second inclined long hole  1602  is formed to be inclined leftward as it travels from middle portion to rear, and the width of the entry portion is gradually widened as it travels from front to rear. The rear surface of the second inclined long hole  1602  is formed parallel to the rear surface of the slider  1600 . 
     Due to this, the second pin  1302  inserted into the second inclined long hole  1602  can be moved within the second inclined long hole  1602 , without moving the slider  1600  when the handle unit  1200  is rotated centered around the rotation axis  1321  of the pivot unit  1320 . 
     In the rear direction of the lower surface  1620 , a door latch connection portion installation portion  1603  is formed to be protruded downward. The door latch connection portion installation portion  1603  has a shape of a letter ‘ ’, and a concave portion of the letter ‘ ’ is formed rearward. The door latch connection portion installation portion  1603  is disposed to be inserted into the right side of the door latch connection portion penetrating groove  1104  of the housing  1100 . 
     In the rear of the upper surface  1610  and the lower surface  1620 , a reinforcement portion  1606  is formed in the form of connecting the upper surface  1610  and the lower surface  1620 . The reinforcement portion  1606  is formed on the upper portion of the door latch connection portion installation portion  1603 . Due to the reinforcement portion  1606 , the rigidity of the slider  1600  is enhanced. 
     The right surface  1630  is formed, on the whole, in the shape of a rectangular plate. The right surface  1630  comprises a slider return spring fitting portion  1604  formed to be protruded rearward, and a moving nut insertion groove  1605 , in the shape of a letter ‘ ’ having an open front and to be penetrated through the left-to-right direction, in the upper portion and the lower portion of the slider return spring fitting portion  1604 . 
     The slider return spring fitting portion  1604  has a shape of an arc in which a concave portion is formed forward. Inner side of the slider return spring fitting portion  1604 , a lead screw  1724 , which will be described later, is disposed, and a slider return spring  1730  is fitted to the outer side of the slider return spring fitting portion  1604 . That is, the slider return spring fitting portion  1604  is disposed between the lead screw  1724  and the slider return spring  1730 . The inner side diameter of the slider return spring fitting portion  1604  is formed to be the same as and similar to the outer side diameter of the moving nut  1750  fitted to the lead screw  1724 , and thereby the slider return spring fitting portion  1604  and the lead screw  1724  are not in contact with each other. 
     The inner surface of the lower portion of the moving nut insertion groove  1605  formed in the upper portion is in contact with the third guide portion  1106  of the housing  1100 , and thereby guided by the third guide portion  1106 , and the inner surface of the upper portion is formed to be spaced apart from the third guide portion  1106  by a predetermined interval. The moving nut insertion groove  1605  formed in the lower portion is formed symmetrically with respect to the moving nut insertion groove  1605  and the slider return spring fitting portion  1604  formed in the upper portion. 
     Due to this, a space in which the moving nut  1750  can be installed is formed between the moving nut insertion groove  1605  and the third guide portion  1106 . After the moving nut  1750  is installed, the inner surface of the moving nut  1750  and the outer surface of the third guide portion  1106  are in contact with each other. 
     &lt;Driving Unit&gt; 
     A driving unit  1700  is illustrated in detail in  FIGS.  15  to  16   . 
     The driving unit  1700  comprises a power delivery unit, a worm  1721  rotated by the power delivery unit, a double gear  1722  rotated by the worm  1721 , a moving nut  1750  being slid in the left-to-right direction by the double gear  1722  and the housing  1100 . 
     The power delivery unit may be provided with a motor  1710 . 
     The driving unit  1700  is disposed at the right side of the housing  1100 . 
     The motor  1710  is installed in the housing  1100  in an up-down direction. 
     The motor  1710  is operated or stopped by a control unit (not shown). 
     A worm  1721  is installed in the shaft of the motor  1710 . 
     The double gear  1722  comprises a worm wheel  1723  and a lead screw  1724  disposed at the left side of the worm wheel  1723 . The worm wheel  1723  and the lead screw  1724  are connected by a single shaft and thereby rotated at the same time. Between the worm wheel  1723  and the lead screw  1724 , a disc whose one surface is connected to the worm wheel  1723 , and the other surface is connected to the lead screw  1724  is formed 
     The worm  1721  is teeth-coupled with the worm wheel  1723 . The double gear  1722  is disposed at the left-to-right direction in the rear direction of the worm  1721 . 
     A slider return spring  1730  is installed on the outer side of the lead screw  1724 . After assembly is completed, one side of the slider return spring  1730  is installed in the slider return spring fitting portion  1604  of the slider  1600 , and the other side of the slider return spring  1730  is in contact with the left side surface of the lead screw penetrating portion  1132 . 
     In the outer side of the slider return spring  1730 , a bumper  1740  is installed. 
     The bumper  1740  is formed, on the whole, in the shape of a circular pipe. The bumper  1740  is disposed in the left-to-right direction. 
     In the front direction of the bumper  1740 , guide portions  1741  formed to be protruded forward are formed at upper and lower portions, respectively. 
     The guide portion  1741  has a shape of a rectangular pipe. The guide portion  1741  is disposed in the left-to-right direction. 
     The upper guide portion  1741  and the lower guide portion  1741  are spaced apart from each other. That is, a housing insertion groove  1742  is formed between the two guide portions  1741 . 
     The bumper  1740  is installed in the bumper installation groove  1136  of the housing  1100 . The third guide portion  1106  formed in the middle is inserted into the housing insertion groove  1742 . The upper surface of the upper portion guide portion  1741  is in contact with the lower surface of the third guide portion  1106  formed in the upper portion, and the lower surface of the lower portion guide portion  1741  is in contact with the upper surface of the third guide portion  1106  formed in the lower portion. That is, the bumper  1740  is disposed between the third guide portions  1106 , and thereby it does not flow in the up-down direction. The bumper  1740  does not flow in the left-to-right direction over a certain range due to the shape of the third guide portion  1106 . 
     Due to the bumper  1740 , the slider return spring  1730  cannot be moved in the up-down and in the front-to-rear direction by a predetermined amount, and noise, vibration, and the like generated when the slider return spring  1730  is operated are absorbed. 
     The moving nut  1750  is formed, on the whole, in the shape of a rectangular plate. 
     The moving nut  1750  is disposed such that the wide surface thereof is disposed facing the left-to-right direction. 
     The central portion of the moving nut  1750  comprises: a second housing insertion groove  1754  formed to have an open front and to be penetrated through the left-to-right direction; a second guide portion  1752  formed in the upper and lower portions of the second housing insertion groove  1754 ; a first housing insertion groove  1753  formed to have an open front and to be penetrated through the left-to-right direction in the upper and the lower portions of the second guide portion  1752 ; and a first guide portion  1751  formed to be protruded rightward in the upper and the lower portions of the first housing insertion groove  1753 . 
     The depth of the first housing insertion groove  1753  in the front-to-rear direction is formed to be deeper than the depth of the second housing insertion groove  1754  in the front-to-rear direction. 
     The third guide portion  1106  of the housing  1100  is inserted into the first housing insertion groove  1753  and the second housing insertion groove  1754 . 
     The rear surface of the first guide portion  1751  is formed to be inclined leftward as it travels from front to rear, so that it can be more easily inserted into the moving nut  1750  when the slider  1600  is sliding in the left-to-right direction. 
     In addition, the moving nut  1750  comprises a lead screw insert portion  1755  formed to be protruded rightward from the central portion. 
     A female screw portion is formed in the lead screw insert portion  1755  to be penetrated through the left-to-right direction. A lead screw  1724  is fitted to the female screw portion. 
     When the lead screw  1724  is rotated, the moving nut  1750 , since one side is inserted into the housing  1100 , is slid in the left-to-right direction along the third guide portion  1106 . 
     The moving nut  1750  is disposed at the left side of the slider  1600  than the right surface  1630 . Therefore, when the moving nut  1750  is moved rightward, the slider  1600  is pushed rightward by the moving nut  1750 , and when the moving nut  1750  is moved leftward, the slider  1600  is pushed leftward by the slider return spring  1730 . 
     In the first guide portion  1751  formed in the lower portion, the third sensor pressing portion  1756  is formed to be protruded downward. The third sensor pressing portion  1756  is protruded sufficiently to push the upper portions of the third sensors  23   a  and  23   b  when the moving nut  1750  is slid in the left-to-right direction. 
     The moving nut  1750  is disposed in the slider  1600  in a way that the third sensor pressing portion  1756  is disposed further at front direction than the front surface of the slider  1600 . Due to this, the interference between the slider  1600  and the third sensor pressing portion  1756  is prevented when the slider  1600  is slid in the left-to-right direction separately from the moving nut  1750 . 
     &lt;Blocking Plate&gt; 
     The housing  1100  comprises a blocking plate  1800  coupled to the rear direction of the housing  1100 . 
     The blocking plate  1800  is illustrated in detail in  FIGS.  17  to  18   . 
     The blocking plate  1800  is formed, on the whole, in the shape of a cuboid having an open front. That is, it is composed of a rear surface portion and a circumferential portion formed to be protruded forward from the circumference of the rear surface portion. 
     The shape of the blocking plate  1800  is formed, on the whole, along the shape of the housing  1100 . 
     The left side portion  1810  and the right side portion  1820  of the blocking plate  1800  are formed to be protruded further forward than the central portion of the blocking plate  1800 . 
     In the center of the blocking plate  1800 , a wire insertion groove  1801  is formed to be penetrated through the front-to-rear direction. A portion of the electric wire  20  is connected to the inside of the housing  1100  through the wire insertion groove  1801 . 
     In the center of the blocking plate  1800 , a housing support portion  1802  and a pivot unit engaging portion  1803  are formed to be protruded forward. 
     The pivot unit engaging portion  1803  is disposed at the right side than the wire insertion groove  1801 , and the housing support portion  1802  is disposed at the right side than the pivot unit engaging portion  1803 . 
     The left side of the housing support portion  1802  is protruded in the shape of an arc formed with a concave left side, and the right side of the housing support portion  1802  protruded in the shape of a straight line formed in the up-down direction. Due to this shape, the lead screw installation portion  1135  of the housing  1100  may be inserted into the housing support portion  1802 . For this reason, the lead screw installation portion  1135  can more firmly support the lead screw  1724 . 
     The right side of the pivot unit engaging portion  1803  is formed to be inclined forward as it travels from left to right. Due to this inclined portion, even if a user presses the right side of the handle unit  1200  and the pivot unit  1320  receives a force, the pivot unit  1320  is not pushed rightward beyond the pivot unit engaging portion  1803 . In addition, since the pivot unit return spring  1324  installed in the pivot unit  1320  receives an elastic force in the counterclockwise direction, the pivot unit  1320  is not moved rightward of the pivot unit engaging portion  1803  even when it is not in contact with the pivot unit engaging portion  1803 . 
     In the lower left of the blocking plate  1800 , a door latch connection portion penetrating groove  1804  is formed to be open forward and to be penetrated through the up-down direction, and thereby a portion of the door latch connection portion  30  is installed. 
     The door latch connection portion penetrating groove  1804  is disposed at the rear direction of the door latch door latch connection portion penetrating groove  1104  of the housing  1100 . 
     In the left side portion  1810 , a key cylinder installation groove  1811  is formed to be open rearward. 
     In the upper and lower portions of the key cylinder installation groove  1811 , a key cylinder fastening portion  1812  is formed. In the key cylinder fastening portion  1812 , a groove through which a bolt can be inserted is formed to be penetrated through the front-to-rear direction, so that the key cylinder  1900  can be bolt-coupled to the key cylinder fastening portion  1812  and installed therein. 
     The right side of the key cylinder installation groove  1811  and the key cylinder fastening portion  1812  are formed inclined rightward as it travels from front to rear, so that the key cylinder  1900  is also installed inclined rightward as it travels from front to rear. Due to this, when the left side of the handle unit  1200  is pulled forward, the gap between the handle unit  1200  and the bumper member  1500  needed for a user for operating the key cylinder  1900  can be minimized. 
     Between the two key cylinder fastening portions  1812 , a key cylinder penetrating groove  1813  is formed to be penetrated through the front-to-rear direction. The key cylinder penetrating groove  1813  has a shape of a circle. 
     The front direction of the key cylinder  1900  is inserted into the housing  1100  through the key cylinder penetrating groove  1813 . Due to this, when the left side of the handle unit  1200  is lifted forward to expose the inside of the housing  1100 , the key cylinder  1900  can be operated. 
     In the lower left end of the inside of the key cylinder installation groove  1811 , a door key connection portion installation portion  1814  is formed to be protruded rearward. The door key connection portion installation portion  1814  is formed in a rectangular pipe shape. In the door key connection portion installation portion  1814 , a groove is formed to be open rearward and to be penetrated through the up-down direction, a portion of the door key connection portion  50 , which will be described later, is installed in the groove. 
     In the right portion  1820 , a motor support portion  1821 , a motor shaft support portion  1822 , and a bumper support portion  1823  are formed to be protruded forward. 
     The motor support portion  1821  is formed in the lower right portion of the right side portion  1820 . 
     The motor support portion  1821  has a shape of a rectangular pipe with rounded corners. Due to this, the motor support portion  1821  is reduced more in weight. 
     The front surface of the motor support  1821  is in contact with the rear surface of the motor  1710  installed in the housing  1100 . Due to this, the motor  1710  is not flowed rearward. 
     The motor shaft support portion  1822  is formed in the form of a rectangular plate with the wider surface thereof is facing the up-down direction. 
     The motor shaft support portion  1822  is disposed at the upper portion of the motor support portion  1821 . 
     The front surface of the motor shaft support portion  1822  is in contact with the rear surface of the first motor shaft installation portion  1123  of the housing  1100 . Due to this, the shaft of the motor  1710  is not flowed rearward. 
     The bumper support portion  1823  is formed in the form of a plate whose left side is protruded further forward than the right side. 
     The bumper support portion  1823  is disposed at the left side of the motor support portion  1821  and the motor shaft support portion  1822 . 
     The front surface of the left side of the bumper support portion  1823  is in contact with the rear surface of the third guide portion  1106  of the housing  1100 , and the front surface of the right side of the bumper support portion  1923  is in contact with the rear surface of the bumper  1740  installed in the housing  1100 . Due to this, the bumper  1740  is not flowed rearward and leftward. 
     In the circumferential portion of the blocking plate  1800 , a first fastening portion  1831  and a second fastening portion  1832  coupled with the housing  1100  are formed. 
     The first fastening portion  1831  is formed comprising a groove through which the bolt can be inserted from rear to front. 
     A portion of the first fastening portion  1831  is formed protruded outward in the right side surface, the upper side surface, and the lower side surface of the circumferential portion of the blocking plate  1800 ; a remaining portion of the first fastening portion  1831  is formed to be protruded rearward in the left side of the blocking plate  1800 ; and the rest of the first fastening portion  1831  is formed to be penetrated through the front-to-rear direction in the left side lower portion. 
     In the upper and lower side surfaces of the circumferential portion of the blocking plate  1800 , the second fastening portion  1832  is formed to be protruded forward. In the central portion of the second fastening portion  1832 , a groove to be penetrated through the up-down direction is formed, and thereby a second fastening portion  1152  of the housing  1100  is inserted into the groove. 
     Due to this, the blocking plate  1800  and the housing  1100  can be more firmly coupled. In addition, a sealing member  1850  is inserted between the front surface of the blocking plate  1800  and the rear surface of the housing  1100 . The sealing member  1850  may fill the gap between the blocking plate  1800  and the housing  1100  and may perform the role of waterproofing and dust proofing. 
     &lt;Connection Portion&gt; 
     A door latch connection portion  30  is illustrated in detail in  FIGS.  5  and  31  to  37   . 
     One end of the door latch connection portion  30  is connected to the slider  1600  and the other end is connected to the motorized latch unit  2000 . 
     As illustrated in  FIG.  31   , the door latch connection portion  30  comprises a cable  33  and a tube  32  surrounding the cable  33 , thereby forming an engagement protrusion  31  in one end of the cable  33 . 
     The cable  33  is installed in the door latch connection portion installation portion  1603  of the slider  1600 , so that an engaging protrusion  31  is located further in the right side than the door latch connection portion installation portion  1603 . 
     Since the width of the groove of the door latch connection portion installation portion  1603  is formed to be larger than the diameter of the cable  33  and smaller than the diameter of the door latch connection portion  30 , the engagement protrusion  31  is pulled to the right side or returned to its original state by the door latch connection portion installation portion  1603 . 
     A groove is formed in the circumference of the one side of the tube  32 , and by inserting the groove into the groove of the second guide portion  1105  of the housing  1100 , the tube  32  is fixed to the housing  1100 . Due to this, when the slider  1600  is slid, only the cable  33  installed inside the tube  32  is moved while the tube  32  remains still. 
     In the other end of the cable  33 , a stopper (not shown) of the motorized latch unit  2000  is formed. 
     The stopper is connected to a safety plate  2400 , as illustrated in  FIG.  32   . When the cable  33  is pulled or returned to its original state, also the safety plate  2400  is slid accordingly. 
     When one side of the safety plate  2400  is pulled along the door latch connection portion  30 , the safety plate  2400  is separated from a lock member  2615  and the rotation of the lock member  2615  becomes possible, and the first sensor  21  is pressed by the safety plate  2400  so that power is applied to the motor  2610 , and thereby the operation of the motor  2610  becomes possible. That is, the motorized latch unit  2000  is unlocked. 
     At this time, when an operation command is issued to the motor  2610  due to the pressing of a specific sensor, operation of the remote control, and the like, the motor  2610  is operating, and the locking member  2615  teeth-coupled with the worm installed on the shaft of the motor  2610  is rotating, and the open lever  2350  inserted in the locking member  2615  is rotating. That is, it becomes the state as illustrated in  FIG.  35   . 
     When the open lever  2350  is rotated, the open lever  2350  is rotated the pivoting member  2370  engaged with the latch  2200  so that the pivoting member  2370  is separated from the latch  2200 . Due to this, when the latch  2200  is rotating by the restoring force of a spring (not shown) installed in the latch  2200 , the striker  2100  of the vehicle body engaged by the latch  2200  releases the latch  2200 , and the door panel will be opened. That is, it becomes the state as illustrated in  FIG.  36   . 
     The door key connection portion  50  is illustrated in  FIG.  5   . 
     The door key connection portion  50  has the same shape and operation principle as the door latch connection portion  30 . However, one end of the door key connection portion  50  is connected to the key cylinder  1900 , and when the key cylinder  1900  is rotated clockwise or counterclockwise by the key, it is pulled upward or returned to its original state accordingly. In addition, the other end of the door key connection portion  50  is connected to an open plate (not shown) interlocked with the open lever  2350 , so that the latch  2200  can be unlocked by manually rotating the open lever  2350 . 
     Hereinafter, a method of operating a flush handle for a vehicle door according to a first embodiment of the present invention having the above-described configuration will be described. 
     &lt;Manual Operation Process&gt; 
     Hereinafter, a process in which the handle unit  1200  is manually operated will be described. 
     As illustrated in  FIG.  1   , when a user presses the right side of the handle unit  1200  from the front direction rearward while the handle unit  1200  is entered, as illustrated in  FIG.  19   , the left side of the handle unit  1200  is rotated forward centered around the right side of the handle unit  1200 . 
     Due to this, the inside of the housing  1100  is exposed to the left rear direction of the handle unit  1200 . In the left rear direction of the handle unit  1200 , a key cylinder  1900  is installed as illustrated in  FIG.  20   . 
     In this state, a user can operate the key cylinder  1900  by inserting a key between the handle unit  1200  and the bumper member  1500 . 
     To further secure a space for inserting the key, the user may pull the handle unit  1200  protruded forward. When the handle unit  1200  is pulled forward sufficiently, as illustrated in  FIG.  21   , the handle unit  1200  is withdrawn in a horizontal state in the left-to-right direction. 
     In this state, the user may operate the key cylinder  1900  by inserting a key between the handle unit  1200  and the bumper member  1500 . 
     When the handle unit  1200  is manually withdrawn as described above, as illustrated in  FIG.  22   , the slider return spring  1730  is compressed rightward by the slider  1600 , and the position of the moving nut  1750  is maintained. 
     Thereafter, when the user releases the handle unit  1200 , the handle unit  1200  is returned to the original state by the slider return spring  1730 . 
     &lt;Manual Withdrawal and Entry Process&gt; 
     Hereinafter, the manual withdrawal and entry process of the handle unit  1200  will be described in detail with reference to a cross-sectional view. 
     The manual withdrawal and entry process is illustrated in detail in  FIGS.  26  to  28   . 
     As illustrated in  FIG.  26   , in a state wherein the handle unit  1200  is entered, when the right side of the handle unit  1200  is pressed, the rear direction of the pivot unit  1320  installed on the right side of the handle unit  1200  is in close contact with the blocking plate  1800 . The pivot unit  1320  receives compression force in the front-to-rear direction by the user and the blocking plate  1800 . 
     The frictional force between the pivot unit  1320  and the blocking plate  1800  is increased by the compression force. When the frictional force becomes greater than the restoring force by the pivot unit return spring  1324  of the pivot unit  1320 , the pivot unit  1320  is not rotated centered around the pivot pin  1327 , thereby fixing the position of the pivot pin  1327 . 
     In this state, when a pressing force is applied to the right side of the pivot pin  1327 , as illustrated in  FIG.  27   , the handle unit  1200  is rotated counterclockwise centered around the pivot pin  1327 . 
     When the handle unit  1200  is rotated, the second pin  1302  is moved a predetermined distance leftward along the rear side surface of the second inclined long hole  1602 , and then blocked by the inclined surface of the first guide portion  1102  in which the upper and lower portions of the second pin  1302  are inserted. 
     When the position of the second pin  1302  is fixed, the handle unit  1200  is no longer rotated. 
     When the handle unit  1200  is rotated, the first pin  1301  is moved a predetermined distance along the first inclined long hole  1601 , and then blocked at the inclined surface of the first guide portion  1102  in which the upper and lower portions of the first pin  1301  are inserted. 
     When the position of the first pin  1301  is fixed, the handle unit  1200  is slid with respect to the extension portion  1310  and rotated. The extension portion return spring  1316  inside the extension portion  1310  is compressed as much as the handle unit  1200  is slid. 
     The extension portion  1310  is slid and rotated with respect to the first pin  1301 . 
     In a state in which the handle unit  1200  is entered, the first pin  1301  and the second pin  1302  are slid only within a space which is formed by the crossing of the grooves of the first and second inclined long holes  1601  and  1602 . That is, since there is no force acting on the slider  1600  due to the first pin  1301  and the second pin  1302 , the slider  1600  does not slide. 
     When the user releases the handle unit  1200 , the handle unit  1200  is entered by the restoring force of the extension portion return spring  1316  of the extension portion  1310 . 
     In this state, when the user pulls the handle unit  1200  forward, the first pin  1301  and the second pin  1302  are moved in the front direction along the first and second inclined long holes  1601  and  1602 . Due to this, the slider  1600  is slid rightward, and the slider return spring  1730  is compressed. 
     When the withdrawal of the handle unit  1200  is completed, the state becomes as illustrated in  FIG.  29   . 
     The extension portion return spring  1316  inside the extension portion  1310  is restored to its original state as the first pin  1301  is moved freely. Since there is no friction between the pivot unit  1320  and the blocking plate  1800 , the pivot unit  1320  is rotated counterclockwise centered around the pivot pin  1327  by the restoring force of the pivot unit return spring  1324 . 
     Since the slider  1600  is slid not by the driving unit  1700 , the moving nut  1750  maintains its original position. 
     That is, when the handle unit  1200  is manually operated, the moving nut  1750  maintains a state of pressing the third sensor  23   b  on the left side as illustrated in  FIG.  37   . 
     When the slider  1600  is slid rightward, the door latch connection portion  30  is pulled. Due to this, the motorized latch unit  2000  is unlocked. 
     However, since the motor  2610  of the motorized latch unit  2000  does not operate in a state where the third sensor  23   b  in the left side is pressed, and thus, unlike the motorized operation process, which will be described later, even if the extension portion  1310  depresses the second sensor  22  by pulling out the left side of the handle unit  1200 , the door panel will not be opened through motorized movement. That is, in order to open the door panel, the motorized latch unit  2000  must be operated manually. 
     When the user inserts a key into the key cylinder  1900  in the handle unit  1200  and turns, the motorized latch unit  2000  is manually operated by the door key connection portion  50 , so that the striker  2100  is escaped from the latch  2200 , thereby opening the door panel. In addition, the door panel may also be opened by pulling out the manual open cable of the motorized latch unit  2000 . 
     In this state, when the user releases the handle unit  1200 , the slider  1600  is moved leftward by the elastic force of the slider return spring  1730 , and accordingly the first pin  1301  and the second pin  1302  are moved toward the rear direction along the first and second inclined long holes  1601  and  1602  of the slider  1600 , and thereby the handle unit  1200  is entered. 
     &lt;Motorized Operation Process&gt; 
     Hereinafter, a process in which the handle unit  1200  is operated through motorized movement will be described. 
     As illustrated in  FIGS.  1  to  2   , when the withdrawal of the handle unit  1200  is inputted through a key or a remote controller, a button, and the like while the handle unit  1200  is being entered, the motor  1710  is operated by the control unit. 
     When the motor  1710  is operated, the worm  1721  is rotated, and as the worm  1721  is rotated, the worm wheel  1723  of the double gear  1722  is rotated, and the lead screw  1724  together with the worm wheel  1723  is also rotated. 
     When the lead screw  1724  is rotated, the moving nut  1750  teeth-coupled with the lead screw  1724  is moved rightward, and the slider  1600  is also moved rightward by the moving nut  1750 . 
     When the slider  1600  is moved to the right, the first pin  1301  and the second pin  1302  are moved toward the front direction along the first and second inclined long holes  1601  and  1602  of the slider  1600 . 
     Accordingly, the handle unit  1200  is withdrawn toward the front direction and is in a state as illustrated in  FIGS.  23 ,  29   , and  34 . 
     When the moving nut  1750  is moved to the right side, the third sensor pressing unit  1756  of the moving nut  1750 , as illustrated in  FIG.  34   , presses the third sensor  23   a  in the right side. When the third sensor  23   a  is pressed, the operation of the motor  1710  is stopped. 
     In addition, when the slider  1600  is slid rightward, the door latch connection portion  30  is pulled. When one side of the safety plate  2400  is pulled according to the door latch connection portion  30 , the safety plate  2400  is separated from the lock member  2615 , so that the rotation of the lock member  2615  becomes possible, and the first sensor  21  is pressed by the safety plate  2400 , thereby enabling the operation of the motor  2610 . That is, the motorized latch unit  2000  is unlocked. 
     In this state, the user may open the door panel by operating the key cylinder  1900  by inserting a key between the handle unit  1200  and the bumper member  1500  as in the manual operation method described above. 
     Unlike this, when a user want to open the door panel through motorized movement, the user can pull the left side of the handle unit  1200  toward the front direction as illustrated in  FIGS.  24 ,  25  and  30   . 
     When the left side of the handle unit  1200  is pulled toward the front direction, unlike when the handle unit  1200  is entered, since the rear direction of the pivot unit  1320  is not fixed, the handle unit  1200  is rotated counterclockwise centered around the second pin  1302 . 
     As the left side of the handle unit  1200  is rotated, the extension portion return spring  1316  in the extension portion  1310  is compressed. As the handle unit  1200  is slid toward the front direction with respect to the extension portion  1310 , the second sensor  22  installed in the rear direction of the handle unit  1200  is separated from the second sensor anti-pressing portion  1314  formed at the rear direction of the extension portion  1310 , and pressed by the outer surface of the length portion  1313  of the extension portion  1310 . 
     When the first sensor  21 , the second sensor  22 , and the third sensor  23   a  in the right side are all pressed, the motor  2610  of the motorized latch unit  2000  is operated, as illustrated in  FIGS.  35  to  36   , and thereby the door panel is opened. 
     When the user releases the handle unit  1200 , the handle unit  1200  is returned to the state as illustrated in  FIG.  23    by the extension portion return spring  1316  of the extension portion  1310 . 
     Thereafter, when the motor  1710  is rotated in the opposite direction to when the handle unit  1200  is withdrawn, as the moving nut  1750  is moved leftward, the slider  1600  is moved leftward by the restoring force of the slider return spring  1730 . 
     When the slider  1600  is moved leftward, the first pin  1301  and the second pin  1302  are moved toward the rear side along the first and second inclined long holes  1601  and  1602  of the slider  1600 . 
     When the moving nut  1750  is moved leftward, the third sensor pressing unit  1756  of the moving nut  1750  presses the third sensor  23   b  in the left side as illustrated in  FIG.  31   . When the third sensor  23   b  is pressed, the operation of the motor  1710  is stopped. 
     When the slider  1600  is slid leftward, the door latch connection portion  30  is returned to its original state. When the safety plate  2400  is returned to the original state along the door latch connection portion  30 , as illustrated in  FIG.  32   , the safety plate  2400  is inserted in the lock member  2615 , so that the rotation of the lock member  2615  is prevented, and the safety plate  2400  is slipped out from the first sensor  21 , and thereby the power to the motor  2610  is cut off. That is, the motorized latch unit  2000  is locked. Due to this, the opening of the door panel due to the electrical malfunction of the motorized latch unit  2000  is prevented. 
     However, as described above, in order for the safety plate  2400  to return to its original state, the motor  2610  of the motorized latch unit  2000  is rotated in the opposite direction to when the door panel is opened, or the process of returning the locking member  2615  and the open lever  2350  to the original state due to the restoring force of the return spring of the pivoting member  2370  should be preceded. 
     Embodiment 2 
     Hereinafter, a second preferred embodiment according to the present invention will be described. 
     A detailed description of the same configuration that has been previously described in the first embodiment will be omitted. 
     As illustrated in  FIG.  38   , a flush handle for a vehicle door of the second embodiment comprises: a slider  3600 ; a handle unit  3200  accommodated in slider  3600 ; and a linear motion conversion mechanism, sliding the handle unit  3200  in the front-to-rear direction in accordance with a sliding of the slider  3600  in the left-to-right direction, or sliding the slider  3600  in the left-to-right direction in accordance with a sliding of the handle unit  3200  in the front-to-rear direction. 
     The linear motion conversion mechanism comprises: a linear motion conversion unit supporting the relative sliding between the slider  3600  and the handle unit  3200 ; and a driving unit  3700 , sliding the slider  3600 . 
     The linear motion conversion unit comprises: first and second inclined long holes  3601  and  3602  formed in the slider  3600 ; and first and second pins  3301  and  3302  installed on the handle unit  3200  to be slid along the first and second inclined long holes  3601  and  3602 . 
     &lt;Housing&gt; 
     A housing  3100  in which the slider  3600  is installed is illustrated in detail in  FIG.  39   . 
     The housing  3100  is generally similar to the housing  1100  of the first embodiment, but has the following differences. 
     The first guide portion  3102 , which is formed to be protruded inward in the upper and lower portions of the circumferential portion of the housing  3100 , is composed of two straight lines continuous in the front-to-rear direction. 
     In the first guide portion  3102 , a portion of the first and second pins  3301  and  3302  is inserted, and it is moved along the first guide portion  3102  only in the front-to-rear direction. 
     In the left side surface of the portion formed to be protruded downward in the left side of the housing  3100 , a wire penetrating groove  3107  is formed to be penetrated through the left-to-right direction. 
     Unlike the first embodiment in which a portion of the wire  20  is connected to each sensor of the handle unit  1200  through the blocking plate  1500 , in the second embodiment, a portion of the wire  20  is connected to each sensor of the handle unit  3200  through the wire penetrating groove  3107  of the housing  3100 . 
     In the lead screw installation portion  3133  formed on the upper right portion of the housing  3100 , a bush installation portion  3125  is formed to be protruded leftward. The bush installation portion  3125  is formed in the front-to-rear direction, and consists of 3 straight lines disposed in parallel in the up-down direction. 
     The upper, lower and front ends of a bush  3762  installed in the right side of a lead screw  3724 , which will be described later, are in contact with the bush installation portion  3125 . 
     In the right side surface of a lead screw installation portion  3135 , a bush installation groove  3135   a  into which the bush  3762  installed on the left side of the lead screw  3724 , which will be described later, is fitted is further formed. In the bush installation groove  3135   a , a groove into which a portion of the bush  3762  is inserted is formed to be penetrated through the left-to-right direction. The diameter of the groove is formed smaller than the width of the bush installation groove  3135   a.    
     &lt;Handle Unit&gt; 
     A handle unit  3200  is illustrated in detail in  FIG.  40   . 
     The handle unit  3200  is generally similar to the handle unit  1200  of the first embodiment, but has the following differences. 
     A second pin installation groove  3241  formed in the right rear direction of the handle unit  3200  has a shape of an arc centered around a pivot pin  3327  installed in the handle unit  3200 . Due to this, the handle unit  3200  can be rotated centered around the pivot pin  3327  without moving the second pin  3302  when the right side of the handle unit  3200  is pressed from the outside. 
     That is, the second pin  3302  is not moved toward the left-to-right direction when the handle unit  3200  is rotated, but it is moved in the front-to-rear direction along the first guide portion  3102  of the housing  3100  only when the handle unit  3200  is slid in the front-to-rear direction. 
     Unlike a wire installation portion  1222  is formed in the rear surface of the handle unit  1200  of the first embodiment, no separate wire installation portion is formed in the rear surface of the handle unit  3200 . 
     Instead, reinforcing portions  3222  are formed in the upper and lower portions in the right side of the rear direction of the handle unit  3200 , respectively. The reinforcement portion  3222  is formed in the left side of the second pin installation groove  3241 , and thereby reinforces the strength of the second pin installation groove  3241 . In addition, it plays a role of supporting the wire  20  connected through the wire penetrating groove  3107  and the wire penetrating groove  3242  of the left side of the rear direction of the handle unit  3200  and the right side portion  3240  of the handle unit so as not to be drooping downward. 
     &lt;Driving Unit&gt; 
     A driving unit  3700  is illustrated in detail in  FIGS.  41  to  42   . 
     The driving unit  3700  is generally similar to the driving unit  1700  of the first embodiment, but has the following differences. 
     A shaft bumper  3763  is further installed on an upper end of a worm  3721  formed in a motor  3710 . The noise generated when the worm  3721  is rotated due to the shaft bumper  3763  in friction with a worm gear installation groove  3122  of the housing  3100  is reduced. 
     A double gear  3722  comprises: a worm wheel  3723 ; a lead screw  3724  disposed on the left side of the worm wheel  3723 ; and a double gear shaft  3725  penetrating the worm wheel  3723  and the lead screw  3724 . The worm wheel  3723  and the lead screw  3724  are connected into one and rotated at the same time. Between the worm wheel  3723  and the lead screw  3724 , a plate in the shape of a donut whose one surface is connected to the worm wheel  3723  and the other surface is connected to the lead screw  3724  is formed. 
     The double gear shaft  3725  is formed to be protruded further outward than the worm wheel  3723  and the lead screws  3724 . 
     In the left side of the moving nut  3750 , a washer installation groove  3757  is formed to be recessed rightward. The washer installation groove  3757  is in communication with a lead screw insertion portion  3755 . 
     In both sides of the double gear shaft  3725 , washers  3761  and a bush  3762  are further fitted. The bush  3762  is disposed at the outer side than the washer  3671 . Due to the washer  3761  and the bush  3762 , the noise generated when the double gear  3722  is rotated in friction with the housing  3100  is reduced. 
     The washer  3761  is formed of a plate in the shape of a donut, and the bush  3762  is formed in a shape in which a hemispherical cover is connected to a plate in the shape of a donut. The diameter of the donut portion of the bush  3762  is formed to be larger than the diameter of the hemisphere portion. 
     The washer  3761  and bush  3762  installed on the left side of the double gear shaft  3725  are installed on the left side of the moving nut  3750  installed on the double gear  3722 . Due to this, the moving nut  3750  will not be separated leftward of the lead screw  3724 . In addition, the bush  3762  is inserted into the bush installation groove  3135   a  of the housing  3100  so that it will not be separated leftward of the lead screw installation portion  3135 . 
     The operation method of the flush handle for a vehicle door according to the second embodiment is the same as the operation method of the first embodiment. 
     Embodiment 3 
     Hereinafter, a third preferred embodiment according to the present invention will be described. 
     Detailed description of the same configuration as the previously described embodiment will be omitted. 
     As illustrated in  FIGS.  45  to  49   , a flush handle for a vehicle door according to a third preferred embodiment of the present invention comprises: a slider  4600 ; a handle unit  4200  accommodated in slider  4600 ; and a linear motion conversion mechanism, sliding the handle unit  4200  in the front-to-rear direction in accordance with a sliding of the slider  4600  in the left-to-right direction, or sliding the slider  4600  in the left-to-right direction in accordance with a sliding of the handle unit  4200  in the front-to-rear direction. 
     The linear motion conversion mechanism comprises: a linear motion conversion unit supporting the relative sliding between the slider  4600  and the handle unit  4200 ; and a driving unit  4700 , sliding the slider  4600 . 
     The linear motion conversion unit comprises: first and second inclined long holes  4601  and  4602  formed in the slider  4600 , and first and second pins  4301  and  4302  installed in the handle unit  4200  to be slid along the first and second inclined long holes  4601  and  4602 . 
     Hereinafter, each configuration will be described in detail with reference to  FIG.  45   . 
     &lt;First Housing&gt; 
     The housing comprises a first housing  4100  and a second housing  4160  coupled to the right side of the first housing  4100 . 
     The first housing  4100  is illustrated in detail in  FIGS.  50  to  51   . 
     The first housing  4100  is formed, on the whole, in the shape of a cuboid to have an open rear side. 
     That is, the first housing  4100  is composed of a front surface portion and a circumferential portion formed to be protruded rearward in the circumferential portion. 
     In the central portion of the first housing  4100 , a handle unit  4200  and a slider  4600  are disposed; in a right side portion of the first housing  4100 , a portion of the driving unit  4700  is disposed; and a key lock unit  4900  is disposed on the left side portion of the first housing  4100 . 
     In the first housing  4100 , a handle unit through hole  4101  is formed in length from the central portion toward the left side portion of the first housing  4100 . 
     The handle unit through hole  4101  is formed along the shape of the front surface portion of the handle unit  4200 , and in the third embodiment, it has a shape of a rectangle having arc-shaped left and right sides and to be penetrated through the front-rear direction. The handle unit through hole  4101  is formed to be larger than the front portion of the handle unit  4200 , thereby preventing interference between the handle unit through hole  4101  and the handle unit  4200 . 
     In the upper and lower portions of the circumferential portion of the first housing  4100 , a first guide portion  4102  is formed to be protruded outward. 
     The first guide portion  4102  is disposed at the left and right sides of the handle unit through hole  4101  to guide sliding of the first and second pins  4301  and  4302  inserted into the handle unit  4200  and the slider  4600 . 
     The first guide portion  4102  is formed in the front-to-rear direction, and a groove into which the first and second pins  4301  and  4302  can be inserted is formed inside the first guide portion  4102 . Due to this, both ends of the first and second pins  4301  and  4302  can be inserted into the groove and slid in the front-to-rear direction. 
     In the lower right side of the first housing  4100 , two third sensor installation grooves  4103  are formed to be spaced apart from each other in the left-to-right direction. The third sensor installation groove  4103  is formed to be protruded with open upper portion and rear side. Third sensors  23   a  and  23   b  are installed from the rear direction toward the front direction in the third sensor installation groove  4103 , and pressed through the upper portion of the third sensor installation groove  4103 . 
     The lower right end of the first housing  4100  is formed lower than the lower end of the central portion of the first housing  4100 . Due to this, a step is formed in the lower right end of the first housing  4100  and the lower end of the central portion of the first housing  4100 , and a door latch connection portion penetrating groove  4104  is formed to be open in the left-to-right direction in a portion where the step is formed. 
     A portion of the door latch connection portion  30  is disposed in the door latch connection portion penetrating groove  4104 . 
     In the right side of the door latch connection portion penetrating groove  4104 , a door latch connection portion installation groove  4105  is formed to be open rearward. 
     In the door latch connection installation groove  4105  a tube  32  of the door latch connection portion  30  is installed, so that the position of the tube  32  is fixed. 
     In the right center of the first housing  4100 , two third guide portions  4106  are formed to be protruded rearward. The third guide portion  4106  is disposed at the right side of the handle unit through hole  4101 . 
     The third guide portion  4106  is formed to be long in the left-to-right direction. 
     In the left side of the third guide portion  4106 , a moving nut blocking portion  4107  is formed in the up-down direction. 
     The moving nut blocking portion  4107  is formed to be protruded further upward and downward than the left end of the third guide portion  4106 . 
     The left side of the third guide portion  4106  is blocked by the moving nut blocking portion  4107 , and the right side of the third guide portion  4106  is blocked by the right side of the circumferential portion of the first housing  4100 . 
     By the third guide portion  4106 , a moving nut  4750  and a moving nut bumper  4760  of a driving unit  4700 , which will be described later, can be slid in the left-to-right direction within a predetermined range. 
     In the right circumferential portion of the first housing  4100 , a first lead screw penetrating groove  4108  is formed to be open rearward and to be penetrated through the left-to-right direction. 
     The first lead screw penetrating groove  4108  has a shape of a semicircle. 
     In the right circumferential portion of the first housing  4100 , a second housing installation portion  4109  is formed to be protruded rightward. 
     The second housing installation portion  4109  has a shape of a semicircle. The diameter of the second housing installation portion  4109  is formed to be larger than the diameter of the first lead screw penetrating groove  4108 , and the second housing installation portion  4109  is disposed at the front direction of the first lead screw penetrating groove  4108 , and thereby a partition wall is formed between the second housing installation portion  4109  and the first lead screw penetrating groove  4108 . 
     A second housing  4160 , which will be described later, is installed between the first lead screw penetrating groove  4108  and the second housing installation portion  4109 . 
     The outer side of the front surface of the first housing  4100  is coupled with a bumper member  4500 , which will be described later. 
     In the circumference of the handle unit handle unit through hole  4101 , a plurality of first, second, and third bumper fastening portions  4113 ,  4114 , and  4115  is formed. 
     The second bumper fastening portion  4114  is formed to be protruded further outward than the front surface portion of the first housing  4100 . The first bumper fastening portion  4113  is formed in the second bumper fastening portion  4114  in the form of a groove recessed toward the handle unit through hole  4101 . 
     Due to the first and second bumper fastening portions  4113  and  4114 , the bumper member  4500  may be fit-coupled toward the inner side from the outer side of the front surface portion of the first housing  4100 . 
     The third bumper fastening portion  4115  has a shape of a cylindrical column protruded forward. 
     Due to the third bumper fastening portion  4115 , the bumper member  4500  can be fit-coupled from the front direction toward the rear direction of the first housing  4100 . 
     Due to this, the first housing  4100  and the bumper member  4500  can be more firmly coupled. 
     In the left circumferential portion of the first housing  4100 , a key cylinder installation portion  4121  is formed to be protruded rearward. 
     The key cylinder installation portion  4121  has a shape of a circle for the right side, and a rectangle for the left side. In the key cylinder installation portion  4121 , a key cylinder installation groove  4122  is formed to be penetrated through the front-to-rear direction. 
     In the left side of the key cylinder installation portion  4121 , a key cylinder fastening portion  4123  is formed. In the key cylinder fastening portion  4123 , a hole through which a bolt can be fastened is formed. 
     In the upper circumferential portion of the first housing  4100 , a fourth fastening portion  4131  is formed to be protruded upward. 
     In the lower portion of the fourth fastening portion  4131 , a lever penetrating groove  4132  is formed to be penetrated through the front-to-rear direction. 
     The lever penetrating groove  4132  is formed to be long in the left-to-right direction according to the rotation radius of the lever  4950 , which will be described later. 
     In the left side of the fourth fastening portion  4131 , a cable installation groove  4133 , an engaging protrusion installation groove  4134 , and a tube installation groove  4135  are formed to be protruded rearward. 
     The cable installation groove  4133  is formed in the left side of the lever penetrating groove  4132 . The cable installation groove  4133  is formed to be open rearward and left-to-right direction. 
     The engaging protrusion installation groove  4134  is formed on the left side of the cable installation groove  4133 . The engaging protrusion installation groove  4134  is formed to be open rearward and left-to-right direction. 
     A tube installation groove  4135  is formed in the left side of the engaging protrusion installation groove  4134 . The tube installation groove  4135  is formed to be open upward and left-to-right direction. 
     The cable installation groove  4133 , the engaging protrusion installation groove  4134 , and the tube installation groove  4135  are located on the same line in the left-to-right direction. 
     In the upper circumferential portion of the first housing  4100 , a lever installation protrusion  4136   a  and a weight balance installation protrusion  4136   b  are formed to be protruded upward. 
     The lever installation protrusion  4136   a  and the weight balance installation protrusion  4136   b  are disposed further forward than the fourth fastening portion  4131 . 
     The lever installation protrusion  4136   a  and the weight balance installation protrusion  4136   b  are formed in the shape of a cylindrical column formed with holes in the up-down direction. 
     The lever installation protrusion  4136   a  is spacedly disposed at the left side of the weight balance installation protrusion  4136   b.    
     Between the lever installation protrusion  4136   a  and the weight balance installation protrusion  4136   b , a lever guide groove  4137  is formed to be penetrated through the up-down direction. 
     The lever guide groove  4137  has a shape of an arc. Due to this, an engaging portion  4954  of the lever  4950 , which will be described later, can be inserted into the lever guide groove  4137  and rotated. 
     In the left side of the lever installation protrusion  4136   a , a lever guide portion  4138  is formed to be protruded upward. 
     The lever guide portion  4138  has a shape of a rectangular plate disposed in the front-to-rear direction. 
     In the right side of the weight balance installation protrusion  4136   b , a weight balance guide portion  4139  is formed to be protruded upward. 
     The weight balance guide portion  4139  is formed in the form of a weight balance  4960 , which will be described later. 
     The weight balance guide portion  4139  is formed to be in contact with the rear surface of the weight balance  4960 , determines the initial position of the weight balance  4960 , and prevents the weight balance  4960  from being pushed rearward than the weight balance guide portion  4139 . 
     The height of the weight balance guide portion  4139  is formed to be the same as and similar to the height of the lever guide portion  4138 . 
     Between the third sensor installation groove  4103 , a first wire penetrating groove  4141  is formed to be penetrated through the front-to-rear direction. 
     The wire  20  is inserted into the first housing  4100  through the first wire penetrating groove  4141  and connected to the third sensors  23   a  and  23   b.    
     In the lower circumferential portion of the first housing  4100 , a second wire penetrating groove  4142  is formed to be penetrated through the rear and front-to-rear directions. 
     The second wire penetrating groove  4142  is disposed at the center of the first housing  4100 . 
     The wire  20  is inserted into the first housing  4100  through the second wire penetrating groove  4142  and connected to the second sensor  22 , the LED  24 , the button sensor  26 , and the fourth sensor  27 . 
     In the circumferential portion of the first housing  4100 , a first fastening portion  4151  and a second fastening portion  4152  coupled with a first blocking plate  4800 , which will be described later, are formed. 
     The first fastening portion  4151  is formed in a shape that comprises a groove through which the bolt can be inserted from rear to front. 
     A portion of the first fastening portion  4151  is formed to be protruded outward in the upper and lower side surfaces of the circumferential portion of the first housing  4100 , and the remainder of the first fastening portion  4151  is formed to be protruded rearward in the left side of the first housing  4100 . 
     The second fastening portion  4152  is formed to be protruded outward in the upper and lower side surfaces of the circumferential portion of the first housing  4100 . The second fastening portion  4152  has a shape of a protrusion inclined inward of the first housing  4100  as it travels from front to rear. 
     In the circumferential portion of the first housing  4100 , a third fastening portion  4153  to be coupled with the door panel is formed. 
     The third fastening portion  4153  is formed to be protruded outward in the upper and lower side surfaces of the circumferential portion of the first housing  4100 . A groove is formed in the third fastening portion  4153  to be penetrated through the front-to-rear direction, and is coupled to the door panel through the groove. A metal pad  4154  in the shape of a donut is installed in the groove to prevent the coupling portion between the first housing  4100  and the door panel from being broken or loosened. 
     In the right circumferential portion of the first housing  4100 , a second housing fastening portion  4155  is formed. 
     The second housing fastening portion  4155  is disposed further forward than the second housing installation portion  4109 . 
     The second housing fastening portion  4155  is formed in the form of a cuboid protruded rightward. 
     The second housing fastening portion  4155  is formed such that the two cuboids are spaced apart in the up-down direction. 
     The second housing fastening portion  4155  is formed with a groove through which a bolt can be inserted from the upper side toward the lower side. 
     A first blocking plate fitting groove  4156  is formed inside the circumferential portion of the first housing  4100 . 
     A first housing fitting protrusion  4805  of the first blocking plate  4800 , which will be described later, is inserted into the first blocking plate fitting groove  4156 . 
     &lt;First Blocking Plate&gt; 
     The first housing  4100  comprises a first blocking plate  4800  coupled to the rear of the first housing  4100 . 
     The first blocking plate  4800  is illustrated in detail in  FIGS.  58  to  59   . 
     The first blocking plate  4800  is formed, on the whole, in the shape of a cuboid having an open front. That is, it is composed of a rear surface portion and a circumferential portion formed to be protruded forward from the circumference of the rear surface portion. 
     The circumferential portion of the first blocking plate  4800  is formed to cover the rear of the circumferential portion of the first housing  4100 . 
     The left side portion  4810  and the right side portion  4820  of the first blocking plate  4800  are formed to be protruded forward as it travels outward. 
     In the center lower portion of the first blocking plate  4800 , a third wire penetrating groove  4801  is formed to be penetrated through the front and up-down directions. 
     The third wire penetrating groove  4801  is in communication with the second wire penetrating groove  4142  of the first housing  4100 . 
     In the center of the first blocking plate  4800 , a fourth sensor pressing portion  4802  and a pivot unit engaging portion  4803  are formed to be protruded forward. 
     The fourth sensor pressing portion  4802  is disposed further at the left side than the third wire penetrating groove  4801 , and the pivot unit engaging portion  4803  is disposed further at the right side than the third wire penetrating groove  4801 . 
     The fourth sensor pressing portion  4802  has a shape of a flat hemisphere. 
     The fourth sensor pressing portion  4802  is located rear side of the fourth sensor  27  installed in the handle unit  4200 . The fourth sensor pressing portion  4802  is formed so that the fourth sensor pressing portion  4802  does not press the fourth sensor  27  in an initial state. 
     The pivot unit engaging portion  4803  is formed to be protruded in the shape of a rectangle in the upper and lower portions of the first blocking plate  4800 , respectively. 
     The pivot unit engaging portion  4803  is disposed further at the left side than the rear of the rotating portion  4322  of the pivot unit  4320 . Due to this, when the user presses the right side of the handle unit  4200 , and thereby the pivot unit  4320  receives a force, the pivot unit  4320  is not pushed leftward due to the pivot unit engaging portion  4803 . 
     In the lower right of the first blocking plate  4800 , a groove  4804  is formed to be penetrated through the front-to-rear direction. 
     Inside the circumferential portion of the first blocking plate  4800 , a first housing fitting protrusion  4805  is formed. 
     The first housing fitting protrusion  4805  is formed to be spaced apart from the circumferential portion of the first blocking plate  4800 . The separation distance is similar to the thickness of a first blocking plate fitting groove  4156  of the first housing  4100 . 
     The first blocking plate fitting groove  4156  of the first housing  4100  can be inserted between the circumferential portion of the first blocking plate  4800  and the first housing fitting protrusion  4805 . 
     Due to this, the gap between the first housing  4100  and the first blocking plate  4800  may be filled without a separate sealing member, and thus waterproof and dustproof are possible. 
     In the left side portion  4810 , a key cylinder installation groove  4811  is formed to be open leftward and rearward. 
     A key cylinder installation portion  4121  of the first housing  4100  is fitted into the key cylinder installation groove  4811 . 
     In the key cylinder installation groove  4811 , a key cylinder penetrating groove  4813  is formed to be penetrated through the front-to-rear direction. The diameter of the key cylinder penetrating groove  4813  is the same as or larger than the diameter of the key cylinder  4930 . 
     In the left side portion  4810 , a second gear installation groove  4814  is formed to be penetrated through the front-to-rear direction. 
     The second gear installation groove  4814  is located in the lower portion of the key cylinder installation groove  4811 . 
     In the right side portion  4820 , a third lead screw penetrating groove  4821 , a second blocking plate installation portion  4822 , and a second blocking plate fastening portion  4823  are formed. 
     The third lead screw penetrating groove  4821  is formed have an open front and to be penetrated through the left-to-right direction. 
     The third lead screw penetrating groove  4821  has a shape of a semicircle. 
     The third lead screw penetrating groove  4821  is formed symmetrically in the front-to-rear direction with the first lead screw penetrating groove  4108  of the first housing  4100 , and in communication with the first lead screw penetrating groove  4108 . 
     A second blocking plate installation portion  4822  has a shape of a semicircle. The diameter of the third blocking plate installation portion  4822  is formed to be larger than the diameter of the third lead screw penetrating groove  4821 , and the second blocking plate installation portion  4822  is disposed at the rear side further than the third lead screw penetrating groove  4821 , and thereby a partition wall is formed between the second blocking plate installation portion  4822  and the third lead screw penetrating groove  4821 . 
     A second blocking plate  4170 , which will be described later, is installed between the third lead screw penetrating groove  4821  and the second blocking plate installation portion  4822 . 
     In the right side portion  4820 , a second blocking plate fastening portion  4923  is formed. 
     The second blocking plate fastening portion  4923  is disposed at the rear side further than the second blocking plate installation portion  4822 . 
     The second blocking plate fastening portion  4823  has a shape of a cuboid protruded rightward. 
     The second blocking plate fastening portion  4823  is formed such that the two cuboids are spaced apart in the up-down direction. 
     In the second blocking plate fastening portion  4823 , a groove through which a bolt can be inserted from the upper side toward the lower side is formed. 
     In the circumferential portion of the first blocking plate  4800 , a first fastening portion  4831  and a second fastening portion  4832  that are coupled to the first housing  4100  are formed. 
     The first fastening portion  4831  is formed in a shape comprising a groove through which the bolt can be inserted from rear to front. A portion of the first fastening portion  4831  is formed to be protruded outward in the upper and lower side portions of the circumferential portion of the first blocking plate  4800 , and the remainder of the first fastening portion  4831  is formed to be penetrated through the front-to-rear direction in the upper left and lower portions. 
     The second fastening portion  4832  is formed to be protruded outward in the upper and lower side surfaces of the circumferential portion of the first blocking plate  4800 . A groove penetrating in the up-down direction is formed in the central portion of the second fastening portion  4832 , and the second fastening portion  4152  of the first housing  4100  is inserted into the groove. 
     Due to this, the first blocking plate  4800  and the first housing  4100  may be more firmly combined. 
     Inside the second fastening portion  4832 , a pin interference preventing groove  4833  is formed. 
     The pin interference preventing groove  4833  is formed on the left and right sides, respectively, so that the front and inner directions are open. 
     The pin interference preventing groove  4833  is in communication with the groove of the first guide portion  4102  of the first housing  4100 . 
     Due to the pin interference preventing groove  4833 , the first pin  4301  and the second pin  4302  can be slid in the front-to-rear direction without interfering with the first blocking plate  4800 . 
     In the upper circumferential portion of the first blocking plate  4800 , a lever interference preventing groove  4834  is formed. 
     The lever interference preventing groove  4834  is formed between the left pin interference preventing groove  4833  and the right pin interference preventing groove  4833 . 
     The lever interference preventing groove  4834  is formed to be open forward, upward, and downward with a concave arc-shaped rear side. The arc is formed according to the rotation radius of the lever  4950 . 
     When the first housing  4100  and the first blocking plate  4800  are coupled, a circumferential portion of the first housing  4100  is positioned in the lower portion of the lever interference preventing groove  4834 . 
     &lt;Second Housing&gt; 
     A second housing  4160  is illustrated in detail in  FIGS.  60  to  61   . 
     The second housing  4160  is formed, on the whole, in the shape of a cuboid to have an open rear side. 
     That is, the first housing  4100  is composed of a front surface portion and a circumferential portion formed to be protruded rearward in the circumference of the front surface portion. 
     The second housing  4160  is formed in a shape in which the lower portion is protruded leftward. 
     In the second housing  4160 , a first housing fastening portion  4161  is formed to be protruded forward. 
     The first housing fastening portion  4161  has a shape of a cuboid so that it can be fitted between the two second housing fastening portions  4155  of the first housing  4100 . 
     The first housing fastening portion  4161  is formed with a groove through which a bolt can be inserted from the upper side toward the lower side. 
     Due to this, the first housing fastening portion  4161  of the second housing  4160  and the second housing fastening portion  4155  of the first housing  4100  can be coupled to each other by bolts. 
     In the left side of the second housing  4160 , a second lead screw penetrating groove  4162  is formed to be penetrated through the rear side and front-to-rear direction. 
     The first lead screw penetrating groove  4108  and the second lead screw penetrating groove  4162  are disposed on the same line in the front-to-rear direction. 
     In the lower portion of the second housing  4160 , a first encoder connector installation groove  4163  is formed to be penetrated through the rear side and up-down directions. 
     In the circumferential portion of the second housing  4160 , a second blocking plate engaging groove  4164  is formed to be recessed from rear to front. 
     The second blocking plate coupling groove  4164  is formed in the remaining section of the circumferential portion of the second housing  4160  except for the section in which the second lead screw penetrating groove  4162  and the first encoder connector installation groove  4163  are formed. 
     In the left side of the circumferential portion of the second housing  4160 , a second blocking plate engagement protrusion  4164   a  is formed to be protruded rearward. 
     The second blocking plate engaging protrusion  4164   a  is formed further inside the second housing  4160  than the second blocking plate engaging groove  4164 . 
     The second blocking plate engaging protrusion  4164   a  is located at the edge of the second housing  4160 . 
     The left side surface of the second blocking plate engaging protrusion  4164   a  is in contact with the inner surface of the circumferential portion of a second blocking plate  4170 , which will be described later. 
     Due to this, the second blocking plate engaging protrusion  4164   a  may play the role of guiding the coupling position when the second housing  4160  and the second blocking plate  4170  are coupled. 
     In the upper portion of the second housing  4160 , a first lead screw installation groove  4165  is formed to have an open rear side. 
     The first lead screw installation groove  4165  has a shape of a semi-cylinder. 
     A first double gear installation portion  4166   a  is formed on the upper portion of the second housing  4160  to be protruded rearward. 
     The first double gear installation portion  4166   a  is formed in the upper portion of the first lead screw installation groove  4165 . 
     In the first double gear installation portion  4166   a , a semi-circular groove in which the upper portion of the shaft of a first double gear  4472 , which will be described later, can be installed is formed. 
     In the center of the second housing  4160 , a second double gear installation portion  4166   b  is formed to be protruded rearward. 
     The second double gear installation portion  4166   b  is formed further in the lower portion than the first lead screw installation groove  4165 . 
     In the second double gear installation portion  4166   b , a groove in the shape of a semi-cylinder in which the central portion of the shaft of the first double gear  4472  may be installed is formed. 
     In the lower portion of the second housing  4160 , a third double gear installation portion  4166   c  is formed to be protruded rearward. 
     In the third double gear installation portion  4166   c , a groove in the shape of a semi-circle in which a lower portion of the shaft of the first double gear  4472  can be installed is formed. 
     The first, second and third double gear installation portions  4166   a ,  4166   b , and  4166   c  are located on the same line in the up-down direction. 
     In the lower left portion of the second housing  4160 , a first motor installation groove  4167  is formed to have an open rear. 
     The first motor installation groove  4167  has a shape of a cuboid. 
     In the right side of the first motor installation groove  4167 , a first motor shaft installation groove  4168   a  and a second motor shaft installation portion  4168   b  are formed. 
     The first motor shaft installation groove  4168   a  is formed in the lower right portion of the second housing  4160 . 
     The first motor shaft installation groove  4168   a  is formed to have an open rear side. 
     In the first motor shaft installation groove  4168   a , the right side of the shaft of a first worm  4472 , which will be described later, is installed. 
     The second motor shaft installation portion  4168   b  is formed in the left upper end of the third double gear installation portion  4166   c.    
     In the second motor shaft installation groove  4168   a , a groove in which the left side of the shaft of the motor  4710 , which will be described later, can be installed is formed to have an open rear side. 
     &lt;Second Blocking Plate&gt; 
     The second housing  4160  comprises a second blocking plate  4170  coupled to the rear side of the second housing  4160 . 
     The second blocking plate  4170  is illustrated in detail in  FIGS.  62  to  63   . 
     The second blocking plate  4170  has a shape of a cuboid having an open front. 
     That is, the second blocking plate  4170  is composed of a rear surface portion and a circumferential portion formed to be protruded forward from the circumference of the rear surface portion. 
     The second blocking plate  4170  is formed in a shape in which the lower portion is protruded leftward. 
     In the second blocking plate  4170 , a first blocking plate fastening portion  4171  is formed to be protruded rearward. 
     The first blocking plate fastening portion  4171  has a shape of a cuboid so that it can be fitted between the two second blocking plate fastening portions  4823  of the first blocking plate  4800 . 
     In the first blocking plate fastening portion  4171 , a groove through which a bolt can be inserted from the upper side toward the lower side is formed. 
     Due to this, the first blocking plate fastening portion  4171  of the second blocking plate  4170  and the second blocking plate fastening portion  4923  of the first blocking plate  4800  may be coupled to each other by bolts. 
     In the left side of the second blocking plate  4170 , a fourth lead screw penetrating groove  4172  is formed to be penetrated through the front and front-to-rear directions. 
     The third lead screw penetrating groove  4821  is formed symmetrically in the front-to-rear direction with the second lead screw penetrating groove  4162  of the second housing  4160 , and is in communication with the second lead screw penetrating groove  4162 . 
     The third lead screw penetrating groove  4821  and the fourth lead screw penetrating groove  4172  of the second blocking plate  4170  are disposed on the same line in the left-to-right direction. 
     That is, the first, second, third and fourth lead screw penetrating grooves  4108 ,  4162 ,  4821 , and  4172  are in communication with one another. 
     In the lower portion of the second blocking plate  4170 , a second encoder connector installation groove  4173  is formed to be penetrated through the front and up-down directions. 
     The second encoder connector installation groove  4173  is formed symmetrically in the front-to-rear direction with the first encoder connector installation groove  4163  of the second housing  4160 , and in communication with the first encoder connector installation groove  4163 . 
     In the circumferential portion of the second blocking plate  4170 , a second housing coupling protrusion  4174  is formed to be protruded forward. 
     The second housing coupling protrusion  4174  is formed in the remaining section of the circumferential portion of the second blocking plate  4170  except the section in which the fourth lead screw penetrating groove  4172  and the second encoder connector installation groove  4173  are formed. 
     The second housing coupling protrusion  4174  is inserted into the second blocking plate coupling groove  4164  of the second housing  4160 . 
     Due to this, the gap between the second housing  4160  and the second blocking plate  4170  can be filled without a separate sealing member, and waterproof and dustproof are possible. In addition, since the second housing  4160  is spatially separated from the first housing  4100  in which the handle unit  4200  being entered and withdrawn from the vehicle door is installed, thereby enhancing the water tightness of the driving unit  4700  installed in the second housing  4160 . There is also an advantage that the amount of noise of the driving unit  4700  exposed outside through the handle unit  4200  is reduced. 
     In the upper portion of the second housing  4160 , a second lead screw installation groove  4175  is formed to have an open front side. 
     The second lead screw installation groove  4175  has a shape of a semi-cylinder. 
     In the right side of the second blocking plate  4170 , a double gear installation groove  4176  is formed in the up-down direction. The double gear installation groove  4176  has a shape of a semi-cylinder. 
     Inner side of the double gear installation groove  4176 , a plurality of protrusions capable of supporting the shaft of the first double gear  4722  is formed. 
     In the lower left portion of the second blocking plate  4170 , a second motor installation groove  4177  is formed to have an open front side. 
     The second motor installation groove  4177  is formed in shape of a cuboid. 
     In the right side of the second motor installation groove  4177 , a second motor shaft installation groove  4178   a  and a second motor shaft installation portion  4178   b  are formed. 
     The second motor shaft installation groove  4178   a  is formed in the lower right portion of the second blocking plate  4170 . 
     The second motor shaft installation groove  4178   a  is formed to have an open front. 
     In the second motor shaft installation groove  4178   a , the right side of the shaft of a first worm  4472 , which will be described later, is installed. 
     In the upper left of the double gear installation groove  4176 , the second motor shaft installation portion  4178   b  is formed to be protruded forward. 
     In the second motor shaft installation portion  4178   b , a groove in which the left side of the shaft of the motor  4710 , which will be described later, can be installed is formed to have an open front side. 
     &lt;Handle Unit&gt; 
     A handle unit  4200  is illustrated in detail in  FIGS.  52  to  53   . 
     The handle unit  4200  is formed, on the whole, in a shape in which left and right sides of a rectangle are protruded rearward. The handle unit  4200  comprises a handle unit main body  4220  corresponding to the rectangle, a left side portion  4230  of the handle unit corresponding to the protruded portion, and a right side portion  4240  of the handle unit. 
     In the left side portion of the handle unit  4200 , an extension portion installation groove  4201  has a shape of a rectangle to be penetrated through the front-to-rear direction, and in the right side portion of the handle unit  4200 , a pivot unit installation groove  4202  has a shape of a rectangle to be penetrated through the front-to-rear direction. 
     The left and right and up and down directions of the extension portion installation groove  4201  and the pivot unit installation groove  4202  are blocked by the handle unit  4200 . Due to this, the extension portion  4310 , which will be described later, is moved along the extension portion installation groove  4201  within the extension portion installation groove  4201 , and the pivot unit  4320  is rotated centered around a pivot pin  4327  within the pivot unit installation groove  4202 . 
     In the rear of the extension portion installation groove  4201 , an extension portion engaging plate  4201   a  is installed. 
     The extension portion engaging plate  4201   a  is formed in the middle in the front-to-rear direction within the extension portion installation groove  4201 . 
     The extension portion engaging plate  4201   a  comprises a circular groove formed to have a diameter equal to or larger than the diameter of the rear portion of the extension portion  4310 , which will be described later. 
     In the lower front portion of the pivot unit installation groove  4202 , an LED installation groove  4203  is formed to be penetrated through the up-down direction. In the LED installation groove  4203 , a lower portion of the LED  24 , which will be described later, is inserted, so that when the handle unit  4200  is withdrawn, a user can check the light of the LED  24  from the outside of the handle unit  4200 . 
     In the left and right sides of the LED installation groove  4203 , an LED installation portion  4205  is formed. 
     The lower end of the LED installation portion  4205  is connected to the lower inner surface of the pivot unit installation groove  4202 . 
     In the upper portion of the LED installation portion  4205 , a protrusion protruded toward the LED installation groove  4203  is formed, and thereby the LED  24  may be hook-coupled to the LED installation portion  4205 . 
     In the upper portion of the LED installation unit  4205 , a button sensor installation portion  4204  is formed. 
     The button sensor installation portion  4204  has a shape of a cuboid having an open rear side, so that the button sensor  26  can be inserted from rear to front of the button sensor installation portion  4204 . 
     The upper end of the button sensor installation portion  4204  is connected to the inner surface of the upper portion of the pivot unit installation groove  4202 . 
     In the upper portion of the button sensor installation portion  4204 , a button penetrating groove  4206  is formed to be penetrated through the up-down direction. 
     The button penetrating groove  4206  is formed to be penetrated through the right side portion of the handle unit  4200 . 
     The button  25  is installed in the upper portion of the button sensor  26 , and a portion of the button  25  is exposed to the outside through the button penetrating groove  4206 . Due to this, when the handle unit  4200  is withdrawn, the user can press the button  25 . When the button  25  is pressed, the button sensor  26  is pressed, and the button sensor  26  transmits a signal to a control unit (not shown). 
     In the left rear side of the pivot unit installation groove  4202 , a wire penetrating groove  4242  is formed to be penetrated through the left-to-right direction. The upper portion of the wire penetrating groove  4242  is formed to have an open rear side, so that the wire  20  can be inserted into the wire penetrating groove  4242  through the open portion. 
     The wire  20  connected to the outside through the third wire penetrating groove  4801  of the first blocking plate  4800  is connected to each sensor of the handle unit  4200  through the wire penetrating groove  4242 , and some of them are connected to LED  24  and the button sensor  26 . 
     In the front surface of the handle unit main body  4220 , a handle cover installation portion  4210  is formed. The handle cover installation portion  4210  is formed to be extended leftward of the handle unit main body  4220 . The handle cover installation portion  4210  comprises a rear plate formed in the shape of a rectangle having arc-shaped left and right sides in accordance with the shape of the handle unit through hole  4101 , and a circumferential portion formed to be protruded rearward spaced apart in a predetermined interval inward from the circumference of the rear plate. 
     In the up, down, left, and right sides of the circumferential portion of the handle cover installation portion  4210 , a handle cover fastening portion  4213  in the shape of a hook is formed to be protruded outward. The handle cover fastening portion  4213  comprises: a protrusion formed in a shape inclined further outward of the handle cover installation portion  4210  as it travels from front to rear; and grooves formed penetrating inward and outward in both sides of the protrusion enabling the elastic deformation of the protrusion. 
     Due to this, a handle cover  4400 , which will be described later, is installed on the outer surface of the circumferential portion of the handle cover installation portion  4210 . 
     In the upper and lower portions of the right side of the circumferential portion of the handle cover installation portion  4210 , a pivot pin installation groove  4214  is formed to have an open front and to be penetrated through the up-down direction. 
     In the center of the handle unit main body  4220 , a first through hole  4221  is formed to be penetrated through the up-down direction. The first through hole  4221  has a shape of a rectangle with rounded corners. The first through hole  4221  is formed large enough to allow a user&#39;s hand to be inserted, so that the user can pull the handle unit  4200  by putting a hand in the first through hole  4221 . At this time, due to the shape of the first through hole  4221 , the user&#39;s grip feeling is enhanced. 
     In the upper rear of the first through hole  4221 , a lever engaging groove  4223  is formed to be open forward and upward. In the lever engaging groove  4223 , a portion of the lever  4950  which can be installed in the upper surface of the first housing  4100  is inserted. Due to this, the handle unit  4200  and the lever  4950  can be interlocked with each other. 
     In the rear surface of the handle unit main body  4220 , a wire installation portion  4222  is formed to be protruded rearward. The wire installation portion  4222  is formed in the form of two rectangular plates spaced apart from each other to be facing each other in the up-down direction. 
     The wire  20  connected to the outside through the third wire penetrating groove  4801  of the first blocking plate  4800  is connected to the second sensor  22  and the fourth sensor  27  installed in the left rear side of the handle unit  4200  through the wire installation portion  4222 . 
     The left side portion of the handle unit  4230  is formed to be open rearward. 
     The left side portion  4230  of the handle unit comprises a first pin installation groove  4231  formed to be penetrated through the up-down direction. 
     The first pin installation groove  4231  is disposed in the upper portion and the lower portion of the extension portion installation groove  4201 . 
     In the right side of the handle unit left portion  4230 , a second sensor installation groove  4232  is formed to be protruded rearward. In the left side of the second sensor installation groove  4232 , a groove is formed to be recessed forward, and thereby the second sensor  22  installed in the second sensor installation groove  4232  is pressed by an extension portion  4310 , which will be described later, through the groove. 
     A fourth sensor installation portion  4233  is formed in the further right side than the second sensor installation groove  4232 . 
     The fourth sensor installation portion  4233  is formed in the form of two rectangular plates spaced apart from each other to be facing each other in the up-down direction. 
     In the rear side of the fourth sensor installation portion  4233 , protrusions are formed in the directions in which the rectangular plates facing each other. Due to this, the fourth sensor  27  is hook-coupled to the fourth sensor installation portion  4233 . 
     The right side portion  4240  of the handle unit is formed to be inclined further forward as the rear side travels from the left side rightward. Due to this, when the handle unit  4200  is rotated counterclockwise centered around the right side portion  4240  of the handle unit, the mutual interference between the handle unit  4200  and the first blocking plate  4800  installed in the rear surface of the first housing  4100  is prevented. 
     In the left side of the right side portion  4240  of the handle unit, a second pin installation groove  4241  is formed to be penetrated through the up-down direction. The second pin installation groove  4241  is formed in the upper and lower portions of the pivot unit installation groove  4202 , and in communication with the pivot unit installation groove  4202 . 
     The handle unit  4200  is connected to the slider  4600  by a second pin  4302  inserted into the second pin installation groove  4241 . 
     &lt;Extension Portion&gt; 
     An extension portion  4310  is illustrated in detail in  FIGS.  52  to  54   . 
     The extension portion  4310  is installed in the left side of the handle unit  4200  to be adjustable in length with respect to the first pin  4301 . 
     The extension portion  4310  comprises a head portion  4311  formed in the shape of a rectangular column with rounded corners, and a length portion  4313  formed in the shape of a cylindrical column in the rear side of the head portion  4311 . The length of the diameter of the length portion  4313  is formed to be smaller than the length of one side of the head portion  4311 . 
     The head portion  4311  is formed in a shape having an open rear, and an extension portion return spring insertion groove  4312  is formed between the inner surface of the head portion  4311  and the outer surface of the length portion  4313 . 
     In the left and right side surfaces of the length portion  4313 , a second sensor anti-pressing portion  4314  is formed to be inclined further toward the center of the length portion  4313  as it travels from front to rear. The second sensor  22  is in contact with only one of the two second sensor anti-pressing portions  4314 , but can further enhance the assemblability by forming the second sensor anti-pressing portions  4314  at both of the left and right sides. 
     At the rear of the length portion  4313 , a slot  4315  is formed to be penetrated through the up-down direction. The slot  4315  is formed long in the left-to-right direction. 
     In the outer side of the length portion  4313 , an extension portion return spring  4316  is fitted. 
     The extension portion  4310  is fitted from front to rear of the handle unit  4200 . The rear side of the extension portion  4310  is blocked by the extension portion engaging plate  4201   a  of the left side portion  4230  of the handle unit. 
     At this time, the front side of the extension portion return spring  4316  is fitted into the extension portion return spring insertion groove  4312 , and the rear side is blocked by the extension portion engaging plate  4201   a , and thereby it is compressed and restored in the front-to-rear direction between the spring insertion groove  4312  and the extension portion engaging plate  4201   a  in accordance with the movement of the handle unit  4200   
     After the assembly, the first pin  4301  is fitted into the slot  4315  of the extension portion  4310  protruded rearward of the handle unit  4200  and the first inclined long hole  4601  of the slider  4600 . Due to this, the left side portion of the handle unit  4200  is connected to the slider  4600 . 
     At this time, due to the shape of the slot  4315 , the first pin  4301  is slid freely along the slot  4315  when the handle unit  4200  is rotated. Due to this, the handle unit  4200  can be rotated while keeping the width of the first inclined long hole  4601  constant. 
     In the upper and lower portions of the first pin  4301 , a first pin bumper  4301   a  may be fitted. The first pin bumper  4301   a  has a shape of a cylinder. 
     The first pin bumper  4301   a  is disposed in the first pin installation groove  4231 , thereby alleviating the impact between the handle unit  4200  and the first pin  4301  due to the rotation of the handle unit  4200 . 
     &lt;Pivot Unit&gt; 
     A pivot unit  4320  is illustrated in detail in  FIGS.  52  to  53   . 
     The pivot unit  4320  is installed on the right side of the handle unit  4200  in a way that the rotation axis of the handle unit  4200  can be changed. 
     The pivot unit  4320  comprises: a rotating shaft  4321  formed in the shape of a letter ‘C’; a rotating portion  4322  formed to be extended rearward from the upper and lower portions of the rotating shaft  4321  centered around the rotating shaft  4321 ; and a pivot unit return spring installation portion  4325  connecting the upper portion of the rotating portion  4322  and the lower portion of the rotating portion  4322  to each other. 
     The rotating shaft  4321  comprises two discs formed to be spaced apart from each other to be facing in the upward direction, and a bar connecting the discs to each other. 
     A groove is formed in the disc of the rotating shaft  4321  to be penetrated through the up-down direction. A pivot pin  4327  is inserted into the groove. The length in the height direction of the pivot pin  4327  is formed to be longer than the length in the height direction of the rotating shaft  4321 , and after installation, a portion of the upper and lower portions of the pivot pin  4327  is protruded outward of the rotating shaft  4321 . 
     A pivot unit return spring  4324  is installed between the two discs of the rotating shaft  4321 . 
     In the center of the pivot unit return spring  4324 , a pivot pin  4327  is inserted. Due to this, the pivot unit return spring  4324  will not be separated along the up-down direction. 
     The rotating portion  4322  is formed, on the whole, in the shape of a plate extended in the front-to-rear direction. The rotating portion  4322  is formed long enough so that the rear portion of the rotating portion  4322  is engaged with the right side of the pivot unit engaging portion  4803  of the first blocking plate  4800  when the handle unit  4200  is entered. 
     In the left side of the rear side of the rotating portion  4322 , a second pin engagement prevention groove  4323  is formed concavely. When the left side surface of the rotating portion  4322  is in contact with the inner surface of the pivot unit installation groove  4202  of the handle unit  4200 , the second pin  4302  is in contact with the second pin engagement prevention groove  4323 . 
     The pivot unit return spring installation portion  4325  has a shape of a rectangular plate. The pivot unit return spring mounting portion  4325  forms a left side surface of the pivot unit  4320 . 
     One side of the pivot unit return spring  4324  is in contact with the pivot unit installation groove  4202  of the handle unit  4200 , and the other side is in contact with the right side surface of the pivot unit return spring installation portion  4325 . The pivot unit return spring  4324  is wound clockwise centered around the one side. That is, due to the pivot unit return spring  4324 , the pivot unit  4320  receives an elastic force in the counterclockwise direction centered around the rotating shaft  4321 . 
     The pivot unit  4320  is installed from front to rear of the handle unit  4200 . The front side of the pivot unit  4320  is then blocked by the handle cover  4400  being installed in the front side of the handle unit  4200 , and will not be flowed in the rear side by the pivot pin  4327  whose upper and lower portions are installed in the third pin installation groove  4214  of the handle unit  4200 . 
     &lt;Handle Cover&gt; 
     The handle cover  4400  is formed similarly to the handle cover  1400  of the first embodiment, as illustrated in  FIGS.  10  to  11   . 
     In the handle cover  4400  of the third embodiment, like the handle cover  1400  of the first embodiment, a third pin support portion  4402 , an extension portion support portion  4403 , and a handle fastening portion  4404  are formed, but a configuration similar to the button installation groove  1401  illustrated in  FIG.  10    is not formed. 
     &lt;Bumper Member&gt; 
     A bumper member  4500  is illustrated in detail in  FIG.  55   . In the center portion of the bumper member  4500 , a handle through hole  4501  through which the handle unit  4200  and the handle cover  4400  are slid is formed to be penetrated through the front-to-rear direction. The handle through hole  4501  has a shape of a rectangle having an arc-shaped left and right sides in accordance with the shape of the front side of the handle unit  4200  and the shape of the handle cover  4400 . 
     The rear side of the bumper member  4500  is coupled with the front surface of the first housing  4100 . 
     In the circumference of the handle through hole  4501 , a plurality of first and second housing fastening portions  4504  and  4505  are formed. 
     The first housing fastening portion  4504  is formed to be extended rearward from the rim of the bumper member  4500 , and in the central portion, a groove through which the second bumper fastening portion  4114  of the first housing  4100  can be inserted is formed to be penetrated through the up-down direction. 
     The second housing fastening portion  4505  is disposed between the first housing fastening portion  4504  and the handle through hole  4501 . 
     The second housing fastening portion  4505  is formed to be penetrated through the front-to-rear direction so that the third bumper fastening portion  4115  of the first housing  4100  can be inserted. 
     Due to this, the bumper member  4500  and the first housing  4100  can be more firmly coupled. 
     Due to the bumper member  4500 , the first housing  4100  is not directly in contact with the door panel and is protected from an external impact, and also performs a function of dustproofing and waterproofing to prevent contaminants or moisture from entering the housing  1100  from the outside. 
     &lt;Slider&gt; 
     A slider  4600  is illustrated in detail in  FIGS.  56  to  57   . 
     The slider  4600  comprises an upper surface  4610  and a lower surface  4620  formed to be extended leftward from both upper and lower ends of a right surface  4630  and a right surface  4630 . That is, the slider  4600  is formed to be open leftward, forward, and rearward, so that the handle unit  4200  can be accommodated. 
     The upper surface  4610  and the lower surface  4620  are formed, on the whole, in the form of a rectangular plate. The left side of the upper surface  4610  and the lower surface  4620  is formed to be inclined further rightward as they travel from the front side toward the rear side, and in the right side, a housing interference prevention portion  4607  is formed to have an open front and right side. 
     Due to this, a space is secured to the left rear side and right front side of the slider  4600 , so that it becomes easy to install in the vehicle door panel. 
     In addition, when the slider  4600  is slid rightward, in the line where the slider  4600  and the first housing  4100  are not interfered, the front-to-rear gap of the right side of the first housing  4100  can be formed as compact as possible. 
     The first and second inclined long holes  4601  and  4602  are formed in the up-down directions in the left and right sides of the upper surface  4610  and the lower surface  4620 . 
     The first and second inclined long holes  4601  and  4602  are formed parallel to the left side surfaces of the upper surface  4610  and the lower surface  4620 . 
     The first inclined long hole  4601  is formed on the left side of the slider  4600 , and the second inclined long hole  4602  is formed on the right side of the slider  4600 . 
     The first inclined long hole  4601  and the second inclined long hole  4602  are formed to have the same width from the front direction up to the rear direction. The width is formed similar to or slightly larger than the size of the diameter of the first pin  4301  and the second pin  4302 . 
     In the rear end portion of the first inclined long hole  4601  and the second inclined long hole  4602 , a groove into which the first pin  4301  and the second pin  4302  can be inserted is formed to be extended rearward. 
     In the upper surface  4610 , a lever guide groove  4605  is formed to be penetrated through the front side and up-down direction. 
     In the rear side of the lower surface  4620 , a wire penetrating groove  4603  is formed to be penetrated through the up-down direction. The wire penetrating groove  4603  is formed long in the left-to-right direction so that the wire  20  is not affected by the sliding of the slider  4600 . 
     In the front and rear of the upper surface  4610  and the lower surface  4620 , a slider bumper insertion groove  4606  is formed. The slider bumper insertion groove  4606  has a shape of a letter ‘L’. 
     The slider bumper insertion groove  4606  formed in the upper surface  4610  is formed such that a portion of the upper portion and the front side or rear side are open. 
     The slider bumper insertion groove  4606  formed in the lower surface  4620  is formed such that a portion of the lower portion and the front side or rear side are open. 
     A slider bumper  4650  is inserted into the slider bumper insertion groove  4606 . 
     In the third embodiment, a total of eight slider bumpers  4650  are inserted. 
     The slider bumper  4650  has a shape of an ‘L’. 
     The slider bumper  4650  installed in the front side of the upper surface  4610  is described as an example as follows. 
     The slider bumper  4650  comprises a vertical portion and a horizontal portion, and the horizontal portion is connected to a rear side of the lower portion of the vertical portion. The upper surface and the lower portion of the front surface of the vertical portion are formed to be protruded convexly. 
     When the slider bumper  4650  is inserted into the slider bumper insertion groove  4606 , the upper surface and the lower portion of the front surface of the vertical portion of the slider bumper  4650  is protruded further outward than the slider  4600 . 
     Since the slider bumper  4650  is installed in the front and rear sides of the upper surface  4610  and the lower surface  4620  of the slider  4600 , the front and rear surfaces and the upper and lower surfaces of the slider  4600  are spaced apart from the first housing  4100  and the first blocking plate  4800 . 
     The slider bumper  4650  may be provided with a rubber material. Due to this, when the slider  4600  is slid, noise due to the friction can be reduced. 
     The right surface  4630  is formed, on the whole, in the shape of a rectangular plate. 
     The right surface  4630  comprises a return spring bumper installation portion  4604  formed to be protruded rightward. 
     The return spring bumper installation portion  4604  has a shape of a semicircle in which the concave portion is formed rearward. In the inner side of the return spring bumper installation portion  4604 , a return spring bumper  4740 , which will be described later, is fitted. 
     &lt;Driving Unit&gt; 
     A driving unit  4700  is illustrated in detail in  FIGS.  64    to  66 . 
     The driving unit  4700  comprises a power delivery unit, a first worm  4721  rotated by the power delivery unit, a first double gear  4722  rotated by the first worm  4721 , a moving nut  4750  being slid in the left-to-right direction by the first double gear  4722  and the housing  4100 . 
     The power delivery unit may be provided with a motor  4710 . 
     The driving unit  4700  is disposed between the second housing  4160  and the second blocking plate  4170 . 
     The motor  4710  is installed in the left-to-right direction between the first motor installation groove  4167  of the second housing  4160  and the second motor installation groove  4177  of the second blocking plate  4170 . 
     The motor  4710  is operated or stopped by the control unit. 
     The first worm  4721  is installed in the shaft of the motor  4710 . 
     In the end portion of the motor  4710  shaft, a motor shaft bumper  4710   a  is installed. 
     The motor shaft bumper  4710   a  has a shape of a cylindrical column formed with grooves in one side. The motor shaft bumper  4710   a  is fitted between the first motor shaft installation groove  4168   a  of the second housing  4160  and the second motor shaft installation groove  4178   a  of the second blocking plate  4170 . 
     In the lower portion of the motor  4710 , an encoder connector  4711  may be installed. 
     The central portion of the encoder connector  4711  is installed between the first encoder connector installation groove  4163  of the second housing  4160  and the second encoder connector installation groove  4173  of the second blocking plate  4170 , a lower portion of the encoder connector  4711  is protruded toward the lower portion of the second housing  4160  and the second blocking plate  4170 . 
     In the central portion of the encoder connector  4711 , an encoder connector bumper  4714  is installed. The encoder connector bumper  4714  is made of a rubber material, and enhances the water tightness of the inner space formed between the second housing  4160  and the second blocking plate  4170 . 
     In the upper portion of the encoder connector  4711 , a motor installation portion  4712  is formed to be open upward and rightward. 
     The encoder connector  4711  is formed to cover a portion of the left side surface and lower surface of the motor  4710  installed in the motor installation portion  4712 . 
     In the left side of the encoder connector  4711 , an encoder installation portion  4713  is formed to be protruded upward. 
     The encoder installation portion  4713  is formed in the front and rear sides of the encoder connector  4711 , respectively. 
     In the upper portion of the encoder mounting portion  4713 , a groove is formed to be open inward and to be penetrated through the left-to-right direction. The groove is disposed further lower than the shaft of the motor  4710  installed in the motor installation portion  4712 , and an encoder  4715  may be installed. 
     The first double gear  4722  comprises a second worm  4723  and a first worm wheel  4724  disposed in the second worm  4723  and the lower portion of the second worm  4723 . 
     The second worm  4723  and the first worm wheel  4724  are connected with a single shaft and rotated simultaneously, and the second worm  4723  and the first worm wheel  4724  are spaced apart from each other, and thereby a portion of the shaft is formed between the second worm  4723  and the first the worm wheel  4724 . 
     The first double gear  4722  is disposed in the up-down direction in the rear side of the first worm  4721 , and the first worm  4721  is teeth-coupled with the first worm wheel  4724 . 
     The upper portion of the shaft of the first double gear  4722  is fitted to the first double gear installation portion  4166   a  of the second housing  4160 , and the central portion of the shaft of the first double gear  4472  is connected to the second double gear installation portion  4166   b , and the lower portion of the shaft of the first double gear  4722  is fitted into the third double gear installation portion  4166   c.    
     Due to this, the front side of the first double gear  4722  is blocked by the second housing  4160 . 
     The rear side of the first double gear  4722  is blocked by the double gear installation groove  4176  of the second blocking plate  4170 . 
     The upper and lower ends of the first double gear  4722  are in contact with the inner surfaces of the second blocking plate  4170 , and thereby the first double gear  4722  does not flow in the up-down direction. 
     The second double gear  4725  comprises a second worm wheel  4726  and a lead screw  4727  disposed at the left side of the second worm wheel  4726 . 
     The second worm wheel  4726  and the lead screw  4727  are connected with a single shaft and rotated simultaneously, and the second worm wheel  4726  and the lead screw  4727  are spaced apart from each other, and thereby a portion of the shaft is formed between the second worm wheel  4726  and the lead screw  4727 . 
     The second double gear  4725  is disposed in the left-to-right direction in the front side of the second worm  4723 , and the second worm  4723  is teeth-coupled with the second worm wheel  4726 . 
     A housing engaging plate  4728  is formed between the second worm wheel  4726  and the lead screw  4727 . 
     The diameter of the housing engaging plate  4728  is formed to be larger than the diameter of the shaft of the second double gear  4725 . An engaging step is formed in the right side of the housing engaging plate  4728 . 
     The left side of the housing engaging plate  4728  is inserted between the second lead screw penetrating groove  4162  of the second housing  4160  and the fourth lead screw penetrating groove  4172  of the second blocking plate  4170 . 
     The diameter of the engaging step of the housing engaging plate  4728  is formed to be larger than the diameter of the second and fourth lead screw penetrating grooves  4162  and  4172 . 
     Due to this, the right side of the housing engaging plate  4728  is engaged with the inner side of the second housing  4160  and the second blocking plate  4170  and does not flow leftward. 
     In the right side of the second double gear  4725 , a second double gear head  4725   a  is installed. 
     In the left side of the second double gear head  4725   a , a groove in which the right side of the second double gear  4725  can be fitted is formed. 
     In the right side of the second double gear head  4725   a , an engaging step is formed. 
     A second double gear bumper  4725   b  may be further installed between the engaging step of the housing engaging plate  4728  and the inner surfaces of the second housing  4160  and the second blocking plate  4170 . The second double gear bumper  4725   b  may be made of a rubber material. Due to this, the inner space formed between the second housing  4160  and the second blocking plate  4170  is sealed separately from the inner space formed between the first housing  4100  and the first blocking plate  4800 , thereby enhancing water tightness. The vibration and noise are also reduced. 
     Between the engaging step of the second double gear head  4725   a  and the inner surfaces of the second housing  4160  and the second blocking plate  4170 , a second double gear bumper  4725   b  may be further installed. 
     The diameter of the second double gear bumper  4725   b  is formed to be larger than the diameter of the engaging step of the housing engaging plate  4728  and the engaging step of the second double gear head  4725   a . The flow in the left-to-right direction and the noise of the second double gear  4725  may be reduced by such the second double gear bumper  4725   b.    
     In the outer side of the lead screw  4725 , a slider return spring  4730  is installed. 
     In both sides of the slider return spring  4730 , a return spring bumper  4740  is installed. 
     The return spring bumper  4740  is formed, on the whole, in the shape of a circular pipe. 
     In the return spring bumper  4740 , a guide portion  4471  is formed to be protruded forward. 
     In the upper and lower portions of the guide portion  4741 , a housing insertion groove  4742  is formed to be open forward and to be penetrated through the left-to-right direction. 
     In the housing insertion groove  4742 , a third guide portion  4106  of the first housing  4100  is inserted. Due to this, the return spring bumper  4740  can be slid in the left-to-right direction and does not flow in the up-down direction. 
     In the return spring bumper  4740 , a lead screw installation groove  4743  is formed to be penetrated through the left-to-right direction. 
     In one side of the housing insertion groove  4742 , a slider return spring installation groove  4744  is formed. 
     The slider return spring installation groove  4744  is formed to be spaced apart from the lead screw installation groove  4743  in the circumference of the lead screw installation groove  4743 . 
     The return spring bumper  4740  installed in the left side of the slider return spring  4730  is installed in the return spring bumper installation portion  4604  of the slider  4600 , and the rear side is blocked by the return spring bumper installation portion  4604 . 
     The rear side of the return spring bumper  4740  installed in the right side of the slider return spring  4730  is blocked by the first blocking plate  4800 . 
     Due to the return spring bumper  4740 , the noise, vibration, and the like generated during the operation of the slider return spring  4730  are absorbed by the return spring bumper  4740 . 
     The moving nut  4750  is formed, on the whole, in the shape of a rectangular plate. 
     The moving nut  4750  is disposed such that the wide surface thereof is disposed facing the left-to-right direction. 
     In the moving nut  4750 , a moving nut bumper installation portion  4472  is formed to be protruded forward. 
     In the upper and lower ends of the moving nut bumper installation portion  4752 , a return spring bumper installation portion  4751  is formed to be protruded rightward. 
     The inner surface of the return spring bumper installation portion  4751  is formed to be in contact with the outer surface of the return spring bumper  4740  after the return spring bumper  4740  is installed. 
     In the moving nut bumper installation portion  4752 , a moving nut bumper insertion groove  4703  is formed to be open forward. 
     The moving nut bumper insertion groove  4753  is formed in a shape in which both sides of the rectangle are protruded upward and downward so that the moving nut bumper  4760 , which will be described later, can be inserted. 
     In the upper and lower portions of the moving nut  4750 , a blocking plate contact protrusion  4754  is formed to be protruded rearward. 
     Due to the blocking plate contact protrusion  4754 , the moving nut  4750  may make a line contact with the first blocking plate  4800 . Due to this, when the moving nut  4750  is slid in the left-to-right direction, the friction force between the moving nut  4750  and the first blocking plate  4800  can be minimized. 
     In the central portion of the moving nut  4750 , a lead screw insertion groove  4755  is formed to be penetrated through the left-to-right direction. The lead screw insertion groove  4755  is formed in the form of a female screw, and may be teeth-coupled with the lead screw  4727 . 
     In the lower portion of the moving nut  4750 , a third sensor pressing portion  4756  is formed to be protruded downward over the moving nut bumper installation portion  4752  and the return spring bumper installation portion  4751 . 
     The third sensor pressing portion  4756  is protruded sufficiently to press the upper portions of the third sensors  23   a  and  23   b  when the moving nut  4750  is slid in the left-to-right direction. 
     The moving nut  4750  is disposed in the slider  4600  in a way that the third sensor pressing portion  4756  is disposed further at front direction than the front surface of the slider  4600 . Due to this, the interference between the slider  4600  and the third sensor pressing portion  4756  is prevented when only the slider  4600  is slid in the left-to-right direction while the moving nut  4750  remains fixed. 
     In the moving nut  4750 , a door latch connection portion installation portion  4757  is formed to be protruded downward. 
     The door latch connection portion installation portion  4757  is disposed at the rear side further than the moving nut bumper installation portion  4752 . 
     The door latch connection portion installation portion  4757  is formed to be bent rearward. 
     The door latch connection portion installation portion  4757  comprises an engaging protrusion insertion groove  4758  and a cable penetrating groove  4759 . 
     The engaging protrusion insertion groove  4758  is formed to be open rearward and downward. 
     The cable penetrating groove  4759  is formed to be open rearward and to be penetrated through the left-to-right direction in the central portion of the engaging protrusion insertion groove  4758 . 
     The width in the up-down direction of the cable penetrating groove  4759  is formed to be narrower than the width in the up-down direction of the insertion groove  4758 . 
     Due to this, the locking protrusion  31  and the cable  33  of the door latch connection portion  30  can be inserted from rear to front of the door latch connection portion installation portion  4757 . In addition, after installation, since the protrusion  31  does not flow in the left-to-right direction, when the moving nut  4750  is slid in the left-to-right direction, the engaging protrusion  31  is also slid along the moving nut  4750  in the left-to-right direction. 
     Since the tube  32  of the door latch connection portion  30  is fixed by the door latch connection portion installation groove  4105  of the first housing  4100 , when the engaging protrusion  31  is slid in the left-to-right direction, only the cable  33  is slid in the left-to-right direction while the tube  32  remains fixed. 
     The moving nut  4750  is disposed at the left side further than the right surface  4630  of the slider  4600 . Due to this, when the moving nut  4750  is moved to the right side, the slider  4600  is moved to the right side by the moving nut  4750 , and when the moving nut  4750  is moved to the left side, the slider  4600  is moved to the left side by the slider return spring  4730 . 
     As described previously, by connecting the door latch connection portion  30  to the moving nut  4750  rather than the slider  4600 , safety is enhanced than the slider  4600  that can be moved by an external impact and a manual operation of the handle unit  4200 . 
     The moving nut bumper  4760  is formed, on the whole, in shape of a cuboid. 
     In the central portion of the moving nut bumper  4760 , a first moving nut fitting groove  4761  is formed to be penetrated through the front-to-rear direction. 
     The first moving nut fitting groove  4761  has a shape of a rectangle and is fitted to the moving nut bumper installation portion  4752  formed in the middle of the moving nut  4750 . 
     In the upper and lower portions of the moving nut bumper  4760 , a third guide portion insertion groove  4762  and a second moving nut fitting groove  4763  are formed. 
     The third guide portion insertion groove  4762  is formed to be open forward and to be penetrated through the left-to-right direction. The third guide portion insertion groove  4762  is fitted to the third guide portion  4106  of the first housing  4100 . 
     Due to this, the moving nut bumper  4760  may be slid in the left-to-right direction along the third guide portion  4106 . 
     The second moving nut fitting groove  4763  is formed to be open upward or downward and to be penetrated through the front-to-rear direction. 
     The second moving nut fitting groove  4763  is disposed at the outer side further than the third guide portion insertion groove  4762 . 
     The second moving nut fitting groove  4763  is fitted to the moving nut bumper installation portion  4752  formed on the upper and lower portions of the moving nut  4750 . 
     Due to this, the moving nut bumper  4760  is fitted to the moving nut  4750  so as not to flow in the left-to-right direction and up-down direction, and the moving nut  4750  is also can be slid in the left-to-right direction along the third guide portion  4106 . 
     By the moving nut bumper  4760 , the noise due to friction when the moving nut  4750  is slid in the left-to-right direction can be reduced. 
     The return spring bumper  4740  and the moving nut bumper  4760  can be slid in the left-to-right direction, due to the third guide portion  4106 , without being rotated with the lead screw  4727  when the lead screw  4727  is rotated. 
     &lt;Door Latch Connection Portion&gt; 
     The door latch connection portion  30  is of the same type as the door latch connection portion  30  of the first embodiment. 
     One end of the door latch connection portion  30  is connected to the moving nut  4750 , and the other end is connected to the motorized latch unit  5000 . 
     A groove is formed in the circumference of one side of the tube  32 . The tube  32  is fixed to the first housing  4100  by fitting the groove into the door latch connection portion installation groove  4105  of the first housing  4100 . 
     &lt;Key Lock Unit&gt; 
     A key lock unit  4900  is illustrated in detail in  FIGS.  67  to  68   . 
     The key lock unit  4900  comprises: a key cylinder  4930  that a user can operate with a key; a first gear  4910  interlocked with the key cylinder  4930 ; a second gear  4920  teeth-coupled with and rotated by the first gear  4910 ; and a gear rod  4940  connecting the second gear  4920  and the motorized latch unit  5000 . 
     In the key cylinder  4930 , a first housing fastening portion  4831  is formed to be protruded to the left side. 
     In the first housing fastening portion  4931 , a groove into which a bolt can be inserted is formed, and the groove is in communication with a key cylinder fastening portion  4123  of the first housing  4100 . Due to this, the first housing  4100  and the key cylinder  4930  are fastened by bolts. 
     In front side of the key cylinder  4930 , a groove that can be turned by inserting a key is formed. 
     In the rear side of the key cylinder  4930 , a first gear installation shaft  4932  is formed. 
     The first gear installation shaft  4932  has a shape of a rectangular column. The first gear installation shaft  4932  is rotated in conjunction with a portion that is rotated in the key cylinder  4930  when the key is inserted and turned. 
     In the rear side the first gear installation shaft  4932 , a first gear clip engaging portion  4932   a  is formed. 
     The first gear clip engaging portion  4932   a  has a shape of a circle. 
     The diameter of the first gear clip engaging portion  4932   a  is equal to or smaller than the length of one side of the first gear installation shaft  4932 . 
     Due to this, the first gear  4910  may pass through the first gear clip engaging portion  4932   a  and be installed on the first gear installation shaft  4932 , and due to the shape of the first gear installation shaft  4932 , the first gear  4910  can be rotated in conjunction with the rotation of the key without being idle. 
     In the first gear clip engaging portion  4932   a , a groove is formed in the circumference of a portion connected to the first gear installation shaft  4932 . 
     Due to this, when the first gear clip  4915  is inserted into the groove of the first gear clip engaging portion  4932   a , in a state in which the first gear  4910  is fitted in the first gear installation shaft  4932 , the rear side of the first gear  4910  is blocked by the first gear clip  4915 , so that the first gear  4910  is not slipped out from the first gear installation shaft. 
     The first gear  4910  and the second gear  4920  may be provided as spur gears. 
     In the first gear  4910 , a key cylinder insertion groove  4911  is formed to be penetrated through the front-to-rear direction. 
     The key cylinder insertion groove  4911  has a shape of a rectangle so that the first gear  4910  can be fitted to the first gear installation shaft  4932  of the key cylinder  4930 . 
     In the second gear  4920 , a gear rod installation groove  4921  is formed to be open rearward. 
     In the rear side of the second gear  4920 , a first installation pin insertion groove  4923  is formed to be penetrated through the left-to-right direction. The first installation pin insertion groove  4923  is in communication with the gear rod installation groove  4921 . 
     In the front side of the second gear  4920 , a second gear shaft  4922  is formed to be protruded forward. 
     In the upper and lower portions of the front side of the second gear shaft  4922 , a protrusion is formed protruded outward, and the central portion is formed to be open forward, leftward, and rightward. Due to this, the second gear shaft  4922  is hook-coupled to the second gear installation groove  4814  of the first blocking plate  4800 . 
     The gear rod  4940  comprises a rod  4941  and an insert portion  4942  formed in both sides of the rod  4941 . 
     The rod  4941  has a shape of a cylindrical column, and the insert portion  4942  is formed in the form of a plate. 
     In the one side of the insert portion  4942 , a second installation pin insertion groove  4943  is formed to be penetrated through the left-to-right direction. 
     Due to this, the insert portion  4942  in which the second installation pin insertion groove  4942  is formed is inserted into the gear rod installation groove  4921  of the second gear  4920 , and when the installation pin  4945  is passed through the first installation pin insertion groove  4923  of the second gear  4920  and the second installation pin insertion groove  4942  of the gear rod  4940 , the second gear  4920  and the gear rod  4940  are connected to each other. 
     The remaining other side of the insert portion  4942  of the gear rod  4940  is connected to the door latch key  5010  of the motorized latch unit  5000 . 
     The door latch key  5010  is formed with a cross-shaped gear rod insertion groove  5011  in which the insert portion  4942  can be installed. Due to this, the first gear  4910  is rotated when the key is inserted to rotate a portion of the key cylinder  4930 , the second gear  4920  engaged with the first gear  4910  is rotated, the gear rod  4940  installed in the second gear  4920  is rotated, the door latch key  5010  is rotated by the gear rod  4940 , and thereby the motorized latch unit  5000  can be unlocked. 
     Hereinafter, a method of operating a flush handle for a vehicle door according to a third embodiment of the present invention having the previously described configuration will be described. 
     &lt;Manual Operation Process&gt; 
     The manual operation process of a flush handle for a vehicle door according to the third embodiment is the same as the operating method of the first embodiment. 
     &lt;Motorized Operation Process&gt; 
     Hereinafter, a process in which the handle unit  4200  is operated through motorized movement will be described. 
     As illustrated in  FIGS.  45  to  46   , when the withdrawal of the handle unit  4200  is inputted through a key or a remote controller, a button, and the like while the handle unit  4200  is being entered, the motor  4710  is operated by the control unit. 
     The input of the withdrawal signal of the handle unit  4200  using a button will be described in detail with reference to  FIG.  74    as follows. 
     When a user presses the handle unit  4200  that is entered toward the inner side of the vehicle, the first pin  4301  is inserted into the groove at the rear side of the first inclined long hole  4601  of the slider  4600 , and thereby the handle unit  4200  is pushed rearward. 
     When the handle unit  4200  is pushed rearward, the fourth sensor  27  is pressed by the fourth sensor pressing portion  4802  of the first blocking plate  4800  and a signal is transmitted to the control unit. 
     When the motor  4710  is operated, the first worm  4721  is rotated; the first worm wheel  4724  of the first double gear  4722  engaged with the first worm  4721  is rotated; when the second worm  4723  is rotated with the first worm wheel  4724 , the second worm wheel  4726  of the second double gear  4725  engaged with the second worm  4723  is rotated; and the lead screw  4727  is rotated together with the second worm wheel  4726 . 
     When the lead screw  4727  is rotated, the moving nut  4750  teeth-coupled to the lead screw  4727  is moved rightward, and the slider  4600  is moved rightward by the moving nut  4750 . 
     When the slider  4600  is moved rightward, the first pin  4301  and the second pin  4302  are moved forward along the first and second inclined long holes  4601  and  4602  of the slider  4600 . 
     Accordingly, the handle unit  4200  is withdrawn forward and is in a state as illustrated in  FIGS.  69 ,  71 , and  73   . 
     When the moving nut  4750  is moved to the right, the third sensor pressing portion  4756  of the moving nut  4750  presses the third sensor  23   a  on the right side as illustrated in  FIG.  71   . When the third sensor  23   a  is pressed, the operation of the motor  4710  is stopped. 
     In addition, when the moving nut  4750  is slid rightward, the door latch connection portion  30  is pulled, and thereby the motorized latch unit  5000  is unlocked. 
     The principle of unlocking the motorized latch unit  5000  is the same as the operating method of the first embodiment. 
     As illustrated in  FIG.  83   , when the left side of the handle unit  4200  is pulled forward, unlike when the handle unit  4200  is entered, since the rear side of the pivot unit  4320  is not fixed, the handle unit  4200  is rotated counterclockwise centered around the second pin  4302 . 
     As the left side of the handle unit  4200  is rotated, the extension portion return spring  4316  in the extension portion  4310  is compressed. As the handle unit  4200  is slid forward with respect to the extension portion  4310 , the second sensor  22  installed at the rear side of the handle unit  4200  is separated from the second sensor anti-pressing portion  4314  formed at the rear side of the extension portion  4310 , and pressed by the outer surface of the length portion  4313  of the extension portion  4310 . 
     When the first sensor  21  of the motorized latch unit  5000 , the second sensor  22  of the handle unit  4200 , and the third sensor  23   a  at the right side are all pressed, the motorized latch unit  5000  is driven, thereby opening the door panel. 
     When the user releases the handle unit  4200 , the handle unit  4200  returns to the state as illustrated in  FIG.  69    by the extension portion return spring  4316  of the extension portion  4310 . 
     After that, when the motor  4710  is rotated in the opposite direction when the handle unit  4200  is withdrawn by a button input, as the moving nut  4750  is moved leftward, the slider  4600  is moved leftward due to the restoring force of the slider return spring  4730 . 
     When the slider  4600  is moved leftward, the first pin  4301  and the second pin  4302  are moved toward the rear side along the first and second inclined long holes  4601  and  4602  of the slider  4600 . 
     When the moving nut  4750  is moved leftward, the third sensor pressing unit  4756  of the moving nut  4750  presses the third sensor  23   b  in the left side as illustrated in  FIG.  70   . When the third sensor  23   b  is pressed, the operation of the motor  4710  is stopped. 
     When the moving nut  4750  is moved leftward, the door latch connection portion  30  is returned to its original state, and the motorized latch unit  5000  is locked. The principle that the motorized latch unit  5000  is locked is the same as the operating method of the first embodiment. 
     Embodiment 4 
     Hereinafter, a fourth preferred embodiment according to the present invention will be described with reference to  FIG.  75   . 
     Detailed description of the same configuration as the previously described embodiment will be omitted. 
     The configuration of the fourth embodiment is almost the same as that of the third embodiment. 
     In the fourth embodiment, instead of using the third sensors  23   a  and  23   b  of the third embodiment, the encoder  4715  is installed in the encoder connector  4711 , and the movement range of the handle unit  4200  is adjusted by the driving of the motor  4710 . 
     After installation, the encoder  4715  is located at the lower side of the shaft of the motor  4710 . 
     The encoder  4715  measures the number of revolutions of the shaft of the motor  4710 , so that the motor  4710  is rotated by a predetermined number of revolutions. Due to this, it is possible to drive the motor  4710  as many times as necessary after calculating the distance at which the handle unit  4200  is withdrawn and entered using the number of revolutions of the motor  4710 . 
     Embodiment 5 
     Hereinafter, a preferred fifth embodiment according to the present invention will be described with reference to  FIGS.  76  to  84   . 
     Detailed description of the same configuration as the previously described embodiment will be omitted. 
     The configuration of the fifth embodiment is almost the same as that of the third embodiment. 
     The fifth embodiment comprises a manual latch unit instead of the motorized latch unit of the third embodiment. 
     The manual latch unit may be opened by receiving the rotational force of the handle unit  4200  through a lever  4950 . 
     The lever  4950  is formed, on the whole, in the form of a right triangle. 
     The lever  4950  is installed such that a right-angled portion of the right triangle is disposed at the right side. 
     Of the right triangle of the lever  4950 , a cover coupling portion  4951  in the shape of a circular pipe is formed at a vertex formed in the front side. 
     The cover coupling portion  4951  is fitted into the lever installation protrusion  4136   a  of the first housing  4100 , so that the lever  4950  and the first housing  4100  are fit-coupled. 
     The lever  4950  can be rotated centered around the lever installation protrusion  4136   a.    
     At an apex formed at the rear of the right triangle of the lever  4950 , a door latch connection portion insertion groove  4952  is formed to be open upward. 
     The door latch connection portion insertion groove  4952  is formed to be partially opened on the right side, and is formed to open about half a turn counterclockwise from the lower portion of the opened right portion, and when the door latch connection portion  30  is installed through the door latch connection portion insertion groove  4952  so that the cable  33  is positioned on the left side of the engaging protrusion  31 , the engaging protrusion  31  does not escape to the left side of the door latch connection portion insertion groove  4952 . 
     A first spring insertion groove  4953  is formed between the first cover coupling portion  4951  and the inner surface of the lever  4950 . 
     The first spring  4970  fitted into the first spring insertion groove  4953  may be provided as a coil spring. 
     In both ends of the first spring  4970 , a first bent portion  4970  and a second bent portion  4972  are formed, respectively. 
     The first bent portion  4971  is located at the left side further than the second bent portion  4972 . 
     The first bent portion  4971  is in contact with the inner surface of the lever  4950 , and the second bent portion  4972  is in contact with the inner surface of the lever penetrating groove  4132  of the first housing  4100 . 
     Due to this, when the lever  4950  is rotated clockwise, the first spring  4970  is compressed as the first bent portion  4971  is getting closer toward the second bent portion  4972 . 
     Of the right angle triangle of the lever  4950 , at the vertex where a right angle is formed, a locking portion  4954  is formed to be protruded downward. 
     The engaging portion  4954  comprises: a lever protrusion  4955  in the shape of a cylindrical column; an extension portion  4956  formed to be extended rightward in the lower portion of the lever protrusion  4955 ; and a handle unit engaging protrusion  4957  formed to be protruded downward in the right side of the extension portion. 
     The lever protrusion  4955  is inserted into the lever guide groove  4137  of the first housing  4100 , and is rotated along the lever guide groove  4137 . 
     The handle unit engaging protrusion  4957  is located in front of the lever engaging groove  4223  of the handle unit  4200 , and when the handle unit  4200  is withdrawn, the handle unit engaging protrusion  4957  is engaged with the lever engaging groove  4223 . 
     In a state where the handle unit  4200  withdrawn, as illustrated in  FIG.  79    or  FIG.  83   , when one side of the handle unit  4200  is pulled and rotated counterclockwise, as the lever engaging groove  4223  is rotated, the handle unit engaging protrusion  4957  engaged with the lever engaging groove  4223  is rotated clockwise by the rotation radius of the handle unit engaging protrusion  4957 . That is, the lever  4950  is rotated all the way clockwise by the handle unit  4200 . Due to this, the engaging protrusion  31  of the door latch connection portion  30  engaged with the lever  4950  is pulled so that the manual latch connected to the door latch connection portion  30  is opened, thereby opening the vehicle door. 
     In the right side of the lever  4950 , a weight balance  4960  that can block the rotation of the lever  4950  by the handle unit  4200  may be installed. 
     The weight balance  4960  has a shape of an egg. 
     The weight balance  4960  is installed such that the round portion of the egg shape is located in the front side and the pointed portion is facing the left rear side. 
     In the weight balance  4960 , a cover coupling groove  4191  is formed to be penetrated through the up-down direction in the round portion of the egg shape. 
     The cover engaging groove  4191  is fitted to the weight balance installation protrusion  4136   b  of the first housing  4100 . Due to this, the weight balance  4960  and the first housing  4100  are fit-coupled. 
     The weight balance  4960  may be rotated centered around the weight balance installation protrusion  4136   b.    
     In the pointed portion of the egg shape of the weight balance  4960 , a second spring installation portion  4962  is formed to be protruded upward. 
     Due to the second spring installation portion  4962 , the center of gravity of the weight balance  4960  is biased toward the second spring installation portion  4962 . 
     In the lower portion of the second spring installation portion  4962 , a second spring installation groove  4963  is formed to be open leftward. 
     The second spring  4980  installed in the second spring installation portion  4962  may be provided as a coil spring. 
     In both ends of the second spring  4980 , a first bent portion  4981  and a second bent portion  4982  are respectively formed. 
     The first bent portion  4981  is located at the left side further than the second bent portion  4982 . 
     The first bent portion  4981  is in contact with the second spring installation groove  4963  of the weight balance  4960 , and the second bent portion  4972  is in contact with the front side of the weight balance guide portion  4139  of the first housing  4100 . 
     Due to this, when the weight balance  4960  is rotated counterclockwise, as the first bending portion  4981  is getting closer toward the second bending portion  4982 , and thereby the second spring  4980  is compressed. 
     A cover  4990  comprises: an upper plate; a first blocking portion  4992  formed on the lower left side of the upper plate; a second blocking portion  4993  formed on the lower right side of the upper plate; a front plate connecting the front sides of the first blocking portion  4992  and the second blocking portion  4993 ; and a lever penetrating groove  4994  formed between the rear side of the first blocking portion  4992  and the rear side of the second blocking portion  4993 . 
     In the left and right sides of the upper plate of the cover  4990 , a bolt penetrating groove  4991  is formed to be penetrated through the up-down direction. 
     The cover  4990  is bolt-coupled with the first housing  4100  by inserting a bolt into the bolt penetrating groove  4991 , and fastening to the lever installation protrusion  4136   a  and the weight balance installation protrusion  4136   b  of the first housing  4100 . 
     The first blocking portion  4992  is fitted to the left side of the lever guide portion  4138  of the first housing  4100 , and the second blocking portion  4993  is fitted to the right side of the weight balance guide portion  4139  of the first housing  4100 . 
     The rear side of the lever  4950  installed in the inner side of the cover  4990  is protruded outside the cover  4990  through the lever penetrating groove  4994  and may be connected to the door latch connection portion  30 . 
     The weight of the weight balance  4960  is formed to react immediately by the inertia in the case of side collision of a vehicle. 
     When an impact occurs on the side of the vehicle and the handle unit  4200  is withdrawn, the weight balance  4960  is also rotated counterclockwise as illustrated in  FIG.  84   , so that the second spring installation portion  4962  is positioned in the front side. 
     Due to this, the rotated weight balance  4960  is positioned within the rotation radius of the lever  4950 , and rotation of the lever  4950  is blocked. Since the lever  4950  is not rotated to the end, the door latch connection portion  30  is not fully pulled, so that the manual latch unit is not opened. That is, the safety of the manual latch unit is enhanced due to the weight balance  4960 . 
     Embodiment 6 
     Hereinafter, a sixth preferred embodiment according to the present invention will be described. 
     Detailed description of the same configuration as the previously described embodiment will be omitted. 
     As illustrated in  FIGS.  85  to  88   , a flush handle for a vehicle door according to a sixth preferred embodiment of the present invention comprises: a slider  6600  installed in the housing; a handle unit accommodated in the slider  6600 ; and a linear motion conversion mechanism, sliding the handle unit in the front-to-rear direction in accordance with a sliding of the slider  6600  in the left-to-right direction, or sliding the slider  6600  in the left-to-right direction in accordance with sliding of the handle unit in the front-to-rear direction. 
     The linear motion conversion mechanism comprises a slider  6600 ; a linear motion conversion unit supporting the relative sliding between the slider  6600  and the handle unit; and a driving unit  6700  that slides. 
     The linear motion conversion unit comprises: first and second inclined long holes  6601  and  6602  formed in the slider  6600 , and first and second pins  6301  and  6302  installed in the handle unit to be slid along the first and second inclined long holes  6601  and  6602 . 
     Hereinafter, each configuration will be described in detail. 
     &lt;First Housing&gt; 
     The housing comprises a first housing  6100  and a second housing  6160  coupled to the right side of the first housing  6100 . 
     The first housing  6100  is illustrated in detail in  FIGS.  89  to  90   . 
     The first housing  6100  is formed similarly to the first housing  4100  of a third preferred embodiment of the present invention. 
     The point in which the first housing  6100  is formed differently from the first housing  4100  of the third preferred embodiment of the present invention is as follows. 
     First, in the lower portion of the circumferential portion of the first housing  6100 , a plurality of lower surface through holes  6130  is formed to be penetrated through the up-down direction. 
     Due to this, the first housing  6100  can be made lighter. In addition, when water flows in, drainage is smoothly performed due to the lower surface through holes  6130 . 
     Next, there is a difference in configuration formed on the upper side surface of the circumferential portion of the first housing  6100 . 
     In an upper side of the circumferential portion of the first housing  6100 , a third fastening portion  6153  coupled to the door panel is formed. 
     The third fastening portion  6153  is formed in the central portion of the upper side surface of the circumferential portion of the first housing  6100 . 
     The shape of the third fastening portion  6153  is similar to the third fastening portion  4153  of a third preferred embodiment of the present invention. 
     In the upper side circumferential portion of the first housing  6100 , a weight balance installation protrusion  6136 , a first cover fitting portion  6138 , a second cover fitting portion  6139 , and a cover engaging protrusion  6139   a  are formed to be protruded upward. 
     The weight balance installation protrusion  6136  is formed, on the whole, in the form of a cylindrical column. 
     The upper portion of the weight balance installation protrusion  6136  is formed to have a larger diameter than the diameter of the lower portion; and a gap is formed between the left and right side portions of the weight balance installation protrusion  6136 . 
     Due to this, a weight balance  6960 , which will be described later, may not be easily separated after being installed in the lower portion of the weight balance installation protrusion  6136 . 
     The first cover fitting portion  6138  is disposed in the left side of the weight balance installation protrusion  6136 . 
     The first cover fitting portion  6138  has a shape of a long cuboid in the front-to-rear direction. 
     The first cover fitting portion  6138  is formed to be open rightward. 
     Due to this, a protruded fitting plate  6991   a  of the cover  6990 , which will be described later, may be inserted. 
     The second cover fitting portion  6139  is disposed in the right side of the weight balance installation protrusion  6136 . 
     The second cover fitting portion  6139  is formed one on each of the front and rear sides of the upper circumferential portion of the first housing  6100 , respectively. 
     The upper portions of the second cover fitting portions  6139  are protruded toward each other and are formed in the shape of a hook. 
     The space between the two second cover fitting portions  6139  is formed to be penetrated through the up-down direction. 
     The cover engaging protrusion  6139   a  is formed between the weight balance installation protrusion  6136  and the second cover fitting portion  6139 . 
     The cover engaging protrusion  6139   a  is formed in the front-to-rear direction. 
     The height of the cover engaging protrusion  6139   a  is formed to be lower than the heights of the first cover fitting portion  6138  and the second cover fitting portion  6139 . 
     Between the weight balance installation protrusion  6136  and the first cover fitting portion  6138 , a weight balance guide groove  6137  is formed to be penetrated through the up-down direction. 
     The weight balance guide groove  6137  has a shape of an arc. Due to this, a first arm  6962  of the weight balance  6960 , which will be described later, may be inserted into the weight balance guide groove  6137  and rotated. 
     &lt;First Blocking Plate&gt; 
     The first housing  6100  comprises a first blocking plate  6800  coupled to the rear of the first housing  6100 . 
     The first blocking plate  6800  is illustrated in detail in  FIGS.  97  to  98   . 
     The first blocking plate  6800  is formed similarly to the first blocking plate  4800  of the third preferred embodiment of the present invention. 
     The first blocking plate  6800  is formed differently from the first blocking plate  4800  of the third preferred embodiment of the present invention as follows. 
     In both left and right sides of the center of the first blocking plate  6800 , a step adjustment boss  6803  is formed to be protruded forward. 
     In the step adjustment boss  6803 , a step adjustment bolt  40 , which will be described later, may be coupled from rear to front. 
     The length of the front-to-rear direction of the step adjustment boss  6803  is formed to be shorter than the length of the step adjustment bolt  40 , so that the step adjustment bolt  40  may be protruded toward the front side of the step adjustment boss  6803 . 
     In the right center of the first blocking plate  6800 , two fourth guide portions  6806  are formed to be protruded forward. The fourth guide portion  6806  is disposed on the same line in the front-to-rear direction as the third guide portion  6106  of the first housing  6100 , and the shape is formed to be the same and similar. 
     In the left side of the fourth guide portion  6806 , a second moving nut blocking portion  6807  is formed in an up-down direction. The second moving nut blocking portion  6807  is disposed on the same line in the front-to-rear direction as the first moving nut blocking portion  6107  of the first housing  6100 , and the shape is formed to be the same and similar. 
     The left side of the fourth guide portion  6806  is blocked by the second moving nut blocking portion  6807 , and the right side of the fourth guide portion  6806  is blocked by the right side of the circumferential portion of the first blocking plate  6800 . 
     Due to such the fourth guide portion  6806 , a moving nut  6750  of the driving unit  6700 , which will be described later, can be slid in the left-to-right direction within a predetermined range. 
     In the upper circumferential portion of the first blocking plate  6800 , a third coupling portion interference prevention groove  6834  is formed instead of the lever interference prevention groove  4834 . 
     The third coupling portion interference prevention groove  6834  is formed to be open forward, upward, and downward in the shape of a trapezoid in which the width is widened toward the front. 
     When the first housing  6100  and the first blocking plate  6800  are coupled, a circumferential portion of the first housing  6100  is positioned in the lower portion of the third coupling portion interference prevention groove  6834 . 
     The key cylinder penetrating groove  6813  is formed to be extended rightward of the key cylinder penetrating groove  4813  of a third preferred embodiment of the present invention. 
     In the right side of the key cylinder penetrating groove  6813 , a door outer side connection portion fixing portion  6835  is formed to be protruded rearward. 
     The door outer side connection portion fixing portion  6835  has a shape of a letter ‘C’, and the space formed in the left side of the door outer side connection portion  6835  is in communication with the key cylinder penetrating groove  6813 . 
     In the door outer side connection fixing portion  6835 , a plate formed to be protruded inward in the shape of a letter ‘C’ is formed. The tube  62  of the door outer side connection portion  60  is fit-coupled to the plate, and thereby it may not be flowed. 
     &lt;Second Housing, Second Blocking Plate&gt; 
     The second housing  6160  and the second blocking plate  6170  are formed to be the same as and similar to the second housing  4160  and the second blocking plate  4170  of a third preferred embodiment of the present invention. 
     &lt;Handle Unit&gt; 
     The handle unit is illustrated in detail in  FIGS.  91  to  92   . 
     The handle unit comprises a front side handle unit  6200  and a rear side handle unit  6250  that is pin-coupled to the rear side of the front side handle unit  6200 . 
     The front side handle unit  6200  is, on the whole, a cuboid shape in which openings are formed in the upper and lower portions and the rear side. 
     The front side handle unit  6200  comprises a front side handle unit main body  6220  formed in the front side, and a front side handle unit left side portion  6230  and a front side handle unit right side portion  6240  formed in the left and right sides. 
     In the front side handle unit left side portion  6230 , a rear side handle unit left side portion insertion groove  6231  is formed to be penetrated through the front-to-rear direction, and in the front side handle unit right side portion  6240 , a rear side handle unit right side portion insertion groove  6241  is formed to be penetrated through the front-to-rear direction. 
     The rear side handle unit left portion insertion groove  6231  is formed such that the rear side of the front side handle unit left side portion  6230  is open. 
     In the front of the rear side handle unit left side portion insertion groove  6231 , as illustrated in  FIG.  103   , a rear side handle unit engaging member  6232  is formed. 
     In the upper and lower left portions of the rear side handle unit left side portion insertion groove  6231 , the rear side handle unit engaging member  6232  is formed to be protruded inward. 
     The rear side handle unit engaging member  6232  formed in the upper portion is formed to be inclined further leftward as it travels from top to bottom, and the rear side handle unit engaging member  6232  formed in the lower portion is formed to be inclined further rightward as it travels from top to bottom. 
     Unlike the above description, the rear side handle unit engaging member  6232  may have any shape as long as the rear side handle unit  6250  is engaged with the rear side handle unit engaging member  6232  and cannot be moved further forward. 
     The width of the left-to-right direction of the rear side handle unit right side portion insertion groove  6241  is formed to be larger than the width of the left-to-right direction of the right side portion of the rear side handle unit  6250 . 
     Due to this, when the front side handle unit  6200  is rotated relative to the right side of the front side handle unit  6200  in which the pivot pin  6327 , which will be described later, is installed, the front side handle unit  6200  and the rear side handle unit  6250  are not interfered. 
     In the left side of the front side handle unit left side portion  6230 , a door outer side connection portion installation groove  6201  is formed to be penetrated through the front-to-rear direction. 
     The door outer side connection portion installation groove  6201  is disposed at the left side of the rear side handle unit left side portion insertion groove  6231 , and is not in communication with each other. 
     The door outer side connection portion installation groove  6201  is formed to be open forward, and the rear side of the door outer side connection portion installation groove  6201  has a shape of a keyhole having a circular upper portion and a rectangular lower portion. That is, the diameter of the circle is formed to be larger than the width of the rectangle in the left-to-right direction. 
     The engaging protrusion  61  and the cable  63  of the door outer side connection portion  60  are installed in the upper portion of the door outer side connection portion installation groove  6201  from rear to front. Thereafter, when the engaging protrusion  61  and the cable  63  are moved to the lower portion of the door outer side connection portion installation groove  6201 , the engaging protrusion  61  does not separated rearward of the door outer side connection portion installation groove  6201  due to the shape of the door outer side connection portion installation groove  6201 . 
     In the upper and lower sides of the front side of the rear side handle unit left side portion insertion groove  6231 , an extension portion pin engaging groove  6202  is formed. 
     The extension portion pin engaging groove  6202  is formed to be open forward. 
     The extension portion pin engaging groove  6202  is formed to be long enough in the front-to-rear direction so that an extension portion pin  6317  can be completely inserted into the rear side handle unit left side portion insertion groove  6231 . 
     Due to this, the extension portion pin  6317  can be installed from front to rear of the extension portion pin engaging groove  6202 . 
     In the lower portion of the front of rear side handle unit right side portion insertion groove  6241 , a first LED installation groove  6203  is formed to be penetrated through the up-down direction. 
     The lower portion of the LED  24  is inserted into the first LED installation groove  6203 , so that when the front side handle unit  6200  is withdrawn, a user can check the light of the LED  24  from the outside of the front side handle unit  6200 . 
     In the upper portion of the front side of the rear side handle unit right side portion insertion groove  6241 , a button penetrating groove  6206  is formed to be penetrated through the up-down direction. 
     In the button through groove  6206 , the upper portion of the button  25  is installed to be exposed to the outside. Due to this, when the front side handle unit  6200  is withdrawn, the user can press the button  25 . 
     In the front of the front side handle unit main body  6220 , a handle cover installation portion  6210  is formed. The handle cover installation portion  6210  is formed to be the same as and similar to the handle cover installation portion  4210  of a third preferred embodiment of the present invention. 
     In the upper and lower portions of the right side of the handle cover installation portion  6210 , a first pivot pin installation groove  6214  is formed to be open forward and inward. 
     Between the rear side of the front side handle unit main body  6220  and the front side handle unit left side portion  6230  and the front side handle unit right side portion  6240 , a first hand insert portion  6221  is formed. 
     The first hand insert portion  6221  is formed to be open upward, downward, and rearward. 
     The first hand insert portion  6221  is formed to have round corners. 
     That is, the corner where the front side handle unit main body  6220  and the front side handle unit right side portion  6240  meet is also formed to be round. 
     The rear side handle unit  6250  is illustrated in more detail in  FIGS.  93  to  94   . 
     The rear side handle unit  6250  is, on the whole, a cuboid shape in which openings are formed in the upper and lower portions and the front side. 
     The rear side handle unit  6250  comprises a rear side handle unit main body  6270  formed at the rear, a rear side handle unit left side portion  6280 , and a rear side handle unit right side portion  6290  formed on the left and right sides. 
     The right side of the rear side handle unit left side portion  6280  is disposed at the right side of the rear side handle unit left side portion insertion groove  6231 , so that the outer surface of the rear side handle unit left side portion  6280  lies on the same line as the outer surface of the front side handle unit left side portion  6230 . 
     That is, the front side of the right side surface of outer surface of the rear side handle unit left side portion  6280  is blocked by the right side surface of the front side handle unit left side portion  6230 , and the left side surface of the rear side handle unit left side portion  6280  is blocked by the rear side handle unit engaging member  6232  of the front side handle unit left side portion  6230 . 
     Due to this, when the rear side handle unit  6250  is withdrawn forward, the front side handle unit  6200  is also withdrawn forward. 
     In the rear side handle unit left side portion  6280 , an extension portion installation groove  6251  has a shape of rectangle to be penetrated through the front-to-rear direction. 
     The extension portion installation groove  6251  is formed to be the same as and similar to the shape of the cross section of a head portion  6311  of the extension portion  6310 , which will be described later. 
     The left and right and up and down directions of the extension portion installation groove  6251  are blocked in by the rear side handle unit  6250 . Due to this, the extension portion  6310  is moved along the extension portion installation groove  6251  within the extension portion installation groove  6251 . 
     In front side of the extension portion installation groove  6251 , an extension portion engaging portion  6251   a  has a shape of a circle. 
     The extension portion engaging portion  6251   a  is formed to be protruded forward. 
     In the central portion of the extension portion engaging portion  6251   a , a circular groove is formed to be penetrated through the front-to-rear direction. 
     The diameter of the groove of the extension portion engaging portion  6251   a  is formed to be smaller than the lengths of the left and right and up-down directions of the extension portion installation groove  6251 . 
     The groove of the extension portion engaging portion  6251   a  is formed to be the same as and similar to the shape of the cross section of a length portion  6313  of an extension portion  6310 , which will be described later. 
     Due to this, the extension portion  6310  is inserted into the extension portion installation groove  6251  from rear to front, so that it is not escaped to the front side of the extension portion installation groove  6251 . 
     A sensor installation groove  6252  is formed over the rear side of the rear side handle unit main body  6270  and the inside of the rear side handle unit right side portion  6290 . 
     The sensor installation groove  6252  is formed such that the rear side of the rear side handle unit main body  6270  is open, and the rear side handle unit right side portion  6290  is to be penetrated through the front-to-rear direction. 
     In the right front side of the sensor installation groove  6252 , a button sensor installation portion  6254  and an LED installation portion  6255  are formed in the shape of a cuboid with an open rear side. 
     Due to this, the button sensor  26  may be inserted in the button sensor installation portion  6254  from rear to front, and the LED  24  may be inserted in the LED installation unit  6255  from rear to front. 
     The button sensor installation portion  6254  is disposed at the upper portion of the LED installation portion  6255 . 
     In the back of the button sensor installation portion  6254 , a protrusion protruded inward of the button sensor installation portion  6254  is formed, and thereby the button sensor  26  is hook-coupled to the button sensor installation portion  6254  so that it may not be escaped rearward. 
     In the upper portion of the button sensor installation portion  6254 , a button installation groove  6256  is formed to be penetrated through the up-down direction. 
     The button installation groove  6256  is formed to be spaced apart at a predetermined interval from the circumference of the button  25 . 
     Due to this, the button  25  may be placed from top to bottom in the button installation groove  6256 . 
     The button  25  is disposed to be in contact with the upper surface of the button sensor  26  through the button installation groove  6256 . 
     For this reason, when the button  25  is pressed, the button sensor  26  is pressed, and the button sensor  26  transmits a signal to a control unit (not shown). 
     In the lower portion of the LED mounting portion  6255 , a second LED installation groove  6253  is formed to be penetrated through the up-down direction. 
     The second LED installation groove  6253  is formed to be the same as and similar to the first LED installation groove  6203  and are in communication with each other. 
     In the second LED installation groove  6253 , the lower portion of the LED  24  is inserted. 
     In the right rear side of the sensor installation groove  6252 , a second sensor housing guide portion  6257  and a second sensor housing installation groove  6258  are formed. 
     The second sensor housing guide portion  6257  is formed at both left and right sides of the lower portion of the sensor installation groove  6252 . 
     The second sensor housing guide portion  6257  has a shape of a step in accordance with the shape of the lower portion of the second sensor housing  22   a.    
     The second sensor housing installation groove  6258  is formed to be penetrated through the up-down direction of the sensor installation groove  6252 . 
     The second sensor housing installation groove  6258  is formed to match the shape of a protrusion protruded in the upper and lower portions of the second sensor housing  22   a , so that the protrusion of the second sensor housing  22   a  may be fitted into the second sensor housing installation groove  6258 . 
     The second sensor housing  22   a  is installed at the correct position by the second sensor housing guide portion  6257  and the second sensor housing installation groove  6258 . 
     In the second sensor housing  22   a , the second sensor  22  is fitted from rear to front, and the second sensor  22  is disposed such that the right side thereof can be pressed by the inner wall of the front side handle unit  6200 . 
     The front side of the rear side handle unit right side portion  6290  is formed to be protruded leftward. 
     The left front side of the rear side handle unit right side portion  6290  is bent in the shape an arc in accordance with the shape of the inner wall of the front side handle unit right side portion  6240 . 
     In the curved portion in the shape of an arc, a second pivot pin installation groove  6264  is formed to be penetrated through the up-down direction. 
     The second pivot pin installation groove  6264  is in communication with the first pivot pin installation groove  6214 . 
     Due to this, the rear side handle unit right side portion  6290  partially supports the front side handle unit right side portion  6240 , so that when the front side handle unit  6200  is rotated centered around the pivot pin  6327  installed in the first and second pivot pin installation grooves  6214  and  6264 , it guides the rotation of the front side handle unit right side portion  6240 . 
     Between the front side of the rear side handle unit main body  6270  and the rear side handle unit left side portion  6280  and the rear side handle unit right side portion  6290 , a second hand insert portion  6271  is formed. 
     The second hand insert portion  6171  is formed such that the up-down direction and the front are open. 
     The second hand insert portion  6271  is formed to have round corners. 
     When the rear side handle unit  6250  is coupled to the front side handle unit  6200 , the first hand insert portion  6221  and the second hand insert portion  6271  form a closed curve. The closed curve is formed large enough to allow a user&#39;s hand to be inserted, so that the user can pull the front side handle unit  6200  by putting a hand in the closed curve. At this time, due to the shape of the first and second hand insert portions  6221  and  6271 , the user&#39;s grip feeling is enhanced. 
     In the lower portion of the center of the rear side handle unit main body  6270 , a wire penetrating groove  6276  is formed to be penetrated through the up-down direction and to be open rearward. 
     Due to the wire penetrating groove  6276 , a space is formed between the rear side handle unit  6250  and the first blocking plate  6800  when the rear side handle unit  6250  is entered, and the wire  20  can be installed through the wire penetrating groove  6276 . 
     The wires  20  connected to the outside through the wire penetrating groove  6276  are connected to each sensor of the rear side handle unit  6250 . 
     In the right side of the rear side handle unit main body  6270 , a wire installation portion  6272  and a step adjustment protrusion  6274  are formed to be protruded rearward. 
     The wire installation portion  6272  is formed in the form of two rectangular plates spaced apart in the up-down direction so as to be facing each other. 
     In the rear of the electric wire installation portion  6272 , a protrusion is formed to be protruded toward the rectangular plates, and due to the protrusion, it is difficult for the wires  20  installed inside the wire installation portion  6272  to be escaped rearward. 
     The step adjustment protrusion  6274  has a shape of a cylindrical column, and protruded enough to be in contact with a step adjustment bolt  40 , which will be described later. 
     The step adjustment protrusion  6274  is disposed at the right side of the wire installation portion  6272 . 
     In the left side of the rear side handle unit main body  6270 , a fourth sensor engaging step  6163  and a plate spring fitting protrusion  6275  are formed. 
     The fourth sensor engaging step  6273  comprises a first portion formed to be protruded inward in the upper portion and lower portion of the rear side handle unit main body  6270 , and a second portion disposed at the left side further than the first portion and formed to be protruded rearward. 
     The first portion of the fourth sensor engaging step  6273  has a shape of a hook at the rear side of the rear side handle unit main body  6270 , and prevents the fourth sensor  27  installed inside the fourth sensor engaging step  6273  from escaping rearward, and the second portion of the fourth sensor engaging step  6273  prevents the fourth sensor  27  from escaping leftward. 
     The plate spring fitting protrusion  6275  is disposed further at the right side than the fourth sensor engaging step  6273 , and is formed to be protruded rearward, thereby preventing the fourth sensor  27  from escaping rightward. 
     The length of the front-to-rear direction of the plate spring fitting protrusion  6275  is formed longer than the front-to-rear direction of the fourth sensor  27 . 
     Due to this, the plate spring fitting protrusion  6275  may be provided with a plate spring  27   a  located at the rear side of the fourth sensor  27 . 
     The plate spring  27   a  may be provided with a metal. 
     The plate spring  27   a  is formed, on the whole, in the shape of a rectangular plate. 
     The plate spring  27   a  has a shape of an arc in which the central portion thereof is protruded rearward when viewed from the side. 
     The plate spring  27   a  is installed between the first portion of the fourth sensor engaging step  6273  and the fourth sensor  27 . 
     Due to such the plate spring  27   a , damages of the fourth sensor  27  by an excessive force is minimized, and the distinction feeling when the handle unit is pressed in the entry direction is improved. 
     In the left side portion of the rear side handle unit  6280 , a first pin installation groove  6281  is formed to be penetrated through the up-down direction. 
     The first pin installation groove  6281  is formed in the upper and lower portions of the left side of the sensor installation groove  6252 . 
     The portion where the first pin installation groove  6281  is formed is formed to be recessed inward, so that the first pin bumper  6301   a  can be installed in the recessed portion. 
     In the right side of the rear side handle unit  6290 , a second pin installation groove  6291  is formed to be penetrated through the up-down direction. 
     The second pin installation groove  6291  is formed at the upper and lower portions of the right side of the sensor installation groove  6252 . 
     The portion where the second pin installation groove  6291  is formed is formed to be protruded outward, and thus has a similar shape as if a first pin bumper  6301   a  is installed thereto. 
     The rear side handle unit  6250  is connected to the slider  6600  by a first pin  6301  installed in the first pin installation groove  6281  and a second pin  6302  installed in the second pin installation groove  6291 . 
     &lt;Extension Portion&gt; 
     An extension portion  6310  is illustrated in detail in  FIGS.  91  to  92   . 
     The extension portion  6310  is installed inside the left side portion  6280  of the rear side handle unit so as to be adjustable in length with respect to the extension portion pin  6317 . 
     The extension portion  6310  comprises: a head portion  6311  formed in the shape of a rectangular column with rounded corners; 
     and a length portion  6313  formed in the form of a cylindrical column in front of the head portion  6311 . The length of the diameter of the length portion  6313  is formed smaller than the length of one side of the head portion  6311 . 
     The head portion  6311  is formed to be open forward, and an extension portion return spring insertion groove  6312  is formed between the inner surface of the head portion  6311  and the outer surface of the length portion  6313 . 
     Inner side of the length portion  6313 , as illustrated in  FIG.  103   , the step adjustment plate  6314  is formed in the form of a rectangular plate. 
     The step adjustment plate  6314  is formed such that when the rear side handle unit  6250  is in the entry state, the rear surface of the step adjustment plate  6314  is placed on the same line as the rear surface of the step adjustment protrusion  6274  of the rear side handle unit  6250 . 
     In the front side of the length portion  6313 , a slot  6315  is formed to be penetrated through the up-down direction. The slot  6315  is formed long in the left-to-right direction. 
     In the outer side of the length portion  6313 , an extension portion return spring  6316  is fitted. 
     The extension portion  6310  is fitted from rear to front in the rear side handle unit  6250 . The rear portion of the extension portion  6310  is blocked by the extension portion engaging portion  6251   a.    
     At this time, the front side of the extension portion return spring  6316  is blocked by the extension portion engaging portion  6251   a , the rear side is inserted into the extension portion return spring insertion groove  6312 , the extension portion pin  6317  is fitted into the slot  6315  of the extension portion  6310  and the extension portion pin engaging groove  6202  of the front side handle unit  6200 . 
     Due to this, the extension portion return spring  6316  is compressed and restored in the front-to-rear direction between the extension portion return spring insertion groove  6312  and the extension portion engaging portion  6251   a  in accordance with the movement of the front side handle unit  6200 . 
     &lt;Handle Cover&gt; 
     A handle cover  6400  is formed similarly to the handle cover  1400  of a first preferred embodiment of the present invention. 
     The handle cover  6400  is illustrated in  FIG.  103   . 
     In the right side of the handle cover  6400 , a pivot pin support portion  6402  is formed to be protruded rearward. 
     The pivot pin support portion  6402  blocks the front side of the pivot pin  6327  to prevent the pivot pin  6327  from being escaped forward, and thereby blocking the pivot pin  6327  from being separated from the front side handle unit  6200 . 
     In the left side of the handle cover  6400 , an extension portion pin support portion  6403  is formed to be protruded rearward. 
     The extension portion pin support portion  6403  blocks the front side of the extension portion pin  6317  to prevent the extension portion pin  6317  from being escaped forward, and thereby blocking the extension portion pin  6317  from being separated from the front side handle unit  6200 . 
     &lt;Bumper Member&gt; 
     A bumper member  6500  is formed similarly to the bumper member  4500  of a third preferred embodiment of the present invention. 
     &lt;Slider&gt; 
     A slider  6600  is illustrated in detail in  FIGS.  95  to  96   . 
     The slider  6600  is formed, on the whole, similarly to the slider  4600  of the third preferred embodiment of the present invention. 
     The point that the slider  6600  is formed differently from the slider  4600  of the third preferred embodiment of the present invention is as follows. 
     A first inclined long hole  6601  comprises, when the handle unit is withdrawn, a first inclined long hole first section  6601   a  where the first pin  6301  passes in the first half, and a first inclined long hole second section  6601   b  where the first pin  6301  passes in the second half. 
     That is, the first inclined long hole first section  6601   a  is formed at the rear side of the slider  6600 , and the first inclined long hole second section  6601   b  is formed in the front side of the slider  6600 . 
     The slope of the first inclined long hole first section  6601   a  is formed to be less steep than that of the first inclined long hole second section  6601   b.    
     It may be formed such that the slope of the first inclined long hole first section  6601   a  is 30 degrees, and the slope of the first inclined long hole second section  6601   b  is 50 degrees. 
     The first inclined long hole first section  6601   a  and the first inclined long hole second section  6601   b  are curvedly connected. 
     A second inclined long hole  6602  also comprises a second inclined long hole first section  6602   a  and a second inclined long hole second section  6602   b , and is formed in the same manner as the first inclined long hole  6601 . 
     Due to such the shape of the first and second inclined long holes  6601  and  6602 , since the resistance according to the angle decreases at the initial stage of withdrawal of the handle unit, the handle unit can be more smoothly withdrawn. 
     In the outer surfaces of the upper surface  6610  and the lower surface  6620  of the slider  6600 , ribs are formed in the shape of a grid to enhance the strength of the slider  6600 . 
     Among the grooves formed by the ribs, a groove into which a weight balance  6960 , which will be described later, is inserted is a weight balance insertion groove  6605 . 
     The weight balance insertion groove  6605  comprises: a guide groove formed in the left-to-right direction; and an engaging groove formed to be protruded forward in the right side of the guide groove. 
     In the right side of the engaging groove of the weight balance insertion groove  6605 , a weight balance engaging plate  6605   a  is formed. 
     When the weight balance  6960  is located in the engagement groove of the weight balance insertion groove  6605 , the weight balance  6960  comes into contact with the weight balance engaging plate  6605   a , and the slider  6600  is no longer moved to the right side. 
     In the preferred sixth embodiment of the present invention, the slider bumper  6606  is formed on the slider  6600  itself without separately installing the slider bumper  4650  described in a third preferred embodiment of the present invention. 
     The slider bumper  6606  formed in the upper surface  6610  is formed to be protruded upward and forward or rearward. 
     The slider bumper  6606  formed in the lower surface  6620  is formed to be protruded downward and forward or rearward. 
     The slider bumper  6606  is protruded in the shape of an arc, and the noise caused by the friction when the slider  6600  is slid may be reduced. 
     A guide groove  6608  is further formed in the rear side of the return spring bumper installation portion  6604  formed in the right surface of the slider  6600 . 
     The guide groove  6608  is formed, in the right surface of the slider  6600 , to be penetrated through the left-to-right direction and to be open rearward. 
     The guide groove  6608  is formed in two spaced apart from each other in the up-down direction. 
     The fourth guide portion  6806  of the first blocking plate  6800  is inserted into the guide groove  6608 . 
     &lt;Driving Unit&gt; 
     A driving unit  6700  is illustrated in detail in  FIG.  99   . 
     The driving unit  6700  is formed, on the whole, similarly to the driving unit  4700  of the third preferred embodiment of the present invention. 
     The point that the driving unit  6700  is formed differently from the driving unit  4700  of the third preferred embodiment of the present invention is as follows. 
     The moving nut  6650  of the preferred sixth embodiment of the present invention is formed in the form of a combination of the moving nut  4750  and the moving nut bumper  4760  of the third preferred embodiment of the present invention. 
     In front of the moving nut  6750 , a first housing guide groove  6753  is formed to be penetrated through the left-to-right direction, and to be open forward. 
     A first housing guide groove  6753  is formed one at each of the upper and lower portions of the front side of the moving nut  6750 . 
     The first housing guide groove  6753  is formed on the same line as the first housing insertion groove  6742  of the return spring bumper  6740  installed in the right side of the moving nut  6750 . 
     In the first housing guide groove  6753  and the first housing insertion groove  6742 , a third guide portion  6106  of the first housing  6100  is inserted. 
     In the rear side of the moving nut  6750 , a first blocking plate guide groove  6754  is formed to be penetrated through the left-to-right direction and to be open rearward. 
     The first blocking plate guide groove  6754  is formed one at each of the upper and lower portions of the rear side of the moving nut  6750 . 
     In the first blocking plate guide groove  6754 , a fourth guide portion  6806  of the first blocking plate  6800  is inserted. 
     That is, the left-to-right direction sliding of the moving nut  6750  is guided by the third guide portion  6106  and the fourth guide portion  6806 . 
     &lt;Door Latch Connection Portion&gt; 
     The door latch connection portion  30  is of the same type as the door latch connection portion  30  of the third preferred embodiment of the present invention. 
     One end of the door latch connection portion  30  is connected to the moving nut  6750  and the other end is connected to the motorized latch unit  5000 , so that the motorized latch unit  5000  may be unlocked by the movement of the moving nut  6750 . 
     &lt;Door Outer Side Connection Portion&gt; 
     As illustrated in  FIGS.  107  to  110   , the door outer side connection portion  60  is inserted into the door outer side connection portion installation groove  6201  of the front side handle unit  6200 , and the other end is connected to the motorized latch unit  5000 . 
     The tube  62  of the door outer side connection portion  60  is inserted into and fixed to the door outer side connection portion  6835  of the first blocking plate  6800 , and when the engaging protrusion  61  inserted into the door outer side connection portion installation groove  6201  according to the position of the tube  62  is lowered downward, the engaging protrusion  61  is in a state where it cannot be escaped rearward of the door outer side connection portion installation groove  6201 . 
     As illustrated in  FIG.  108   , when the front side handle unit  6200  is withdrawn, the engaging protrusion  61  is disposed in the front side of the door outer side connection portion installation groove  6201  so that engaging protrusion  61  is not engaged with the rear side of the door outer side connection portion installation groove  6201 . 
     In the state as illustrated in  FIG.  107   , if the front side handle unit  6200  is withdrawn, and becomes a state as illustrated in  FIG.  108   , the motorized latch  5000  is unlocked by the door latch connection portion  30 . 
     In this state, as illustrated in  FIG.  109   , when the front side handle unit  6200  is pulled about 5°, as illustrated in  FIG.  106   , the second sensor  22  is pressed, and the power is applied to the motorized latch  5000 , and thereby the vehicle door is opened electrically. 
     At this time, although the engaging protrusion  61  of the door outer side connection portion  60  is pulled by the rear side of the door outer side connection portion installation groove  6201 , it has little effect on the motorized latch  5000 . 
     As illustrated in  FIG.  110   , when the front side handle unit  6200  is pulled about 10 degrees, the engaging protrusion  61  of the door outer side connection portion  60  is further pulled by the rear of the door outer side connection portion installation groove  6201 , and the motorized latch  5000  is mechanically operated to open the vehicle door. 
     That is, when the power is not normally applied to the motorized latch  5000 , the user can mechanically open the vehicle door by pulling the front side handle unit  6200  completely. 
     &lt;Key Lock Unit&gt; 
     A key lock unit  6900  is the same type as the key lock unit  4900  of a third preferred embodiment of the present invention. 
     &lt;Weight Balance&gt; 
     The weight balance  6960  is illustrated in detail in  FIGS.  100  to  102   . 
     The weight balance  6960  comprises a first housing fitting portion  6961  in the shape of a donut, a first arm  6696  and a second arm  6963  connected to a first housing fitting portion  6161 . 
     A groove formed in the center of the first housing fitting portion  6161  is fitted into the weight balance installation protrusion  6136  of the first housing  6100 . 
     The first housing fitting portion  6161  is rotatably formed with respect to the weight balance installation protrusion  6136 . 
     The first housing fitting portion  6161  is formed to be open downward, and a spring  6970  is installed in the lower portion of the first housing fitting portion  6161 . 
     The first arm  6962  is connected to the left side of the first housing fitting portion  6961 . 
     The first arm  6696  is formed so that the left side thereof is protruded downward. 
     Due to this, the lower portion of the first arm  6696  is positioned within the weight balance insertion groove  6605  of the slider  6600  through the weight balance guide groove  6137  of the first housing  6100  after assembly. 
     The second arm  6963  is connected to the front side of the first housing fitting portion  6961 . 
     The spring  6970  may be provided as a coil spring. At both ends of the spring  6970 , a first bent portion  6971  and a second bent portion  6972  are formed, respectively. 
     The first bent portion  6971  is positioned further forward than the second bent portion  6972 . 
     The first bent portion  6971  is in contact with the outer side surface of the second arm  6963 , and the second bent portion  6972  is in contact with the outer surface of the first fastening portion  6151  which is formed in the upper portion. 
     Due to this, when the weight balance  6960  is rotated counterclockwise, the spring  6970  is compressed as the first bent portion  6971  is getting closer toward the second bent portion  6972 . 
     When in the initial state, the first arm  6962  of the weight balance  6960  is positioned in the guide groove of the weight balance insertion groove  6605  of the slider  6600 , so that the slider  6600  can be slid freely in the left-to-right direction. 
     When an impact occurs on the side of the vehicle, as illustrated in  FIG.  102   , the weight balance  6960  is rotated counterclockwise so that the first arm  6962  is positioned at the right side of the weight balance engaging plate  6605   a  of the slider  6600 , and thereby the slider  6600  cannot be moved rightward. 
     Since the movement of the slider  6600  is blocked, the rear side handle unit  6250  interlocked with the slider  6600  is not moved, and since the door latch connection portion  30  connected to the rear side handle unit  6250  is not pulled, the manual latch unit is not opened. 
     That is, the safety of the manual latch unit is enhanced due to the weight balance  6960 . 
     &lt;Cover&gt; 
     A cover  6990  of the weight balance  6960  is illustrated in detail in  FIG.  100   . 
     The cover  6990  is formed, on the whole, in the shape of a flat cuboid. 
     The lower portion of the cover  6990  is formed to be open. In the left side of the cover  6990 , a first fitting portion  6991  is formed to be protruded leftward. 
     The first fitting portion  6991  is formed to be in contact with the right side of the first cover fitting portion  6138  of the first housing  6100 . 
     Due to the first fitting portion  6991 , the cover  6990  is not moved leftward. 
     In the lower portion of the first fitting portion  6991 , a protruding fitting plate  6991   a  is formed. 
     The protruding fitting plate  6991   a  is formed to be protruded leftward further than the first fitting portion  6991 , and is inserted into the first cover fitting portion  6138  of the first housing  6100 . 
     Due to the protruding fitting plate  6991   a , the left side of the cover  6990  is not lifted upward. 
     In the right side of the cover  6990 , a second fitting portion  6992  is formed to be protruded rightward. 
     The second fitting portion  6992  is formed one at each of the front side and the rear side of the cover  6990 . 
     The second fitting portion  6992  is formed to be hook-coupled to the inner surface of the second cover fitting portion  6139  of the first housing  6100 . 
     Due to the second fitting portion  6992 , the right side of the cover  6990  is not lifted upward. 
     The lower portion of the right side of the cover  6990  is in contact with the cover engaging protrusion  6131   a  of the first housing  6100 , and thereby the cover  6990  is not moved rightward. 
     First, after inserting the protruding fitting plate  6991   a  of the cover  6990  into the first cover fitting portion  6138 , the right side of the cover  6990  is lowered so that the second fitting portion  6992  is hook-coupled to the second cover fitting portion  6139 , and thereby the position of the cover  6990  is fixed. 
     &lt;Step Adjustment Bolt&gt; 
     A step adjustment bolt  40  is illustrated in detail in  FIG.  103   . 
     The step adjustment bolt  40  can be fastened to the step adjustment boss  6803  of the first blocking plate  6800  from rear to front. 
     In the front side of the step adjustment boss  6803  of the left side, a step adjustment protrusion  6274  of the rear side handle unit  6250  is disposed, and in the front side of the step adjustment boss  6803  of the right side, a step adjustment plate  6314  of the extension portion  6310  is disposed. 
     The position of the front side handle unit  6200  is changed according to the positions of the rear side handle unit  6250  and the extension portion  6310 . 
     When the forward protruding amount of the step adjustment bolt  40  from the step adjustment boss  6803  is adjusted, the position of the front side handle unit  6200  in the front-to-rear direction can be adjusted. 
     Due to this, when assembling a flush handle for a vehicle door, by adjusting the position of the front side handle unit  6200  to match the design of the vehicle door, the sense of unity between the outer surface of the vehicle door and the front surface of the front side handle unit  6200  can be improved. 
     Hereinafter, a method of operating a flush handle for a vehicle door according to a sixth embodiment of the present invention having the previously described configuration will be described with reference to  FIGS.  104  to  106   . 
     As illustrated in  FIG.  104   , in the state where the handle unit is withdrawn, when the right side of the front side handle unit  6200  is pressed, as illustrated in  FIG.  105   , the front side handle unit  6200  is rotated counterclockwise centered around the pivot pin  6327 . 
     When the front side handle unit  6200  is rotated, the extension portion  6310  connected to the front side handle unit  6200  is pulled forward and the extension portion return spring  6316  is compressed. When the force applied to the front side handle unit  6200  is removed, the extension portion return spring  6316  is tensioned and the front side handle unit  6200  is returned to its original position. 
     At this time, the rear side handle unit  6250  is connected to the slider  6600  by the first and second pins  6301  and  6302 , so it is not moved. 
     This is also the same when the front side handle unit  6200  is pulled forward while the handle unit is withdrawn, as illustrated in  FIG.  106   . 
     When the rear side handle unit  6250  is withdrawn by the sliding of the slider  6600 , the front side handle unit  6200  is also moved along the drawing direction accordingly, but when a user pulls the front side handle unit  6200 , only the front side handle unit  6200  is rotated centered around the pivot pin  6327 , and the rear side handle unit  6250  is fixed in the withdrawn position. 
     That is, by separating each function using a rear side handle unit  6250  connected to the slider  6600  to perform entry and withdrawal operations, and the front side handle unit  6200  to perform pulling operation, the functions of the handle unit can be stably driven without tangling with each other. 
     In addition, since only the front side handle unit  6200  is operated by the extension portion return spring  6316 , the operating force of the extension portion return spring  6316  can be reduced. 
     As previously described, although it is described with reference to preferred embodiments of the present invention, those skilled in the art may implement the present invention through various modifications or variations without departing from the spirit and scope of the present invention as set forth in the claims below.