Patent Publication Number: US-2023141558-A1

Title: Ice maker and refrigerator including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 16/256,063, filed on Jan. 24, 2019, which claims the benefit of the Korean Patent Application No. 10-2018-0009970, filed on Jan. 26, 2018. The disclosures of the prior applications are incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an ice maker and a refrigerator including the same, and more particularly, to an ice maker and a refrigerator including the same, in which an ice making amount is increased, ice separation is easily made and energy efficiency is improved. 
     BACKGROUND 
     A refrigerator is an apparatus used to freshly store food for a long time. The refrigerator has a food storage compartment therein, wherein the food storage compartment is always maintained at a low temperature state by a cooling cycle to allow food to be maintained at a fresh state. 
     The food storage compartment provides a plurality of storage compartments having their respective properties different from each other to allow a user to select a storage method suitable for each food by considering types and features of food and a storage period of food. Main examples of the storage compartments include a refrigerating compartment and a freezing compartment. 
     If a user desires to drink beverage or water together with ices, the user should take ices out of an ice tray provided in the freezing compartment by opening a freezing compartment door. However, in this case, there is inconvenience in that the user should separate ices from the ice tray after opening the freezing compartment door and then taking the ice tray out of the freezing compartment. Also, if the user opens the freezing compartment door, the cool air of the freezing compartment is taken out, whereby a temperature of the freezing compartment is increased. Therefore, since a compressor should be driven for a longer time, a problem occurs in that energy is wasted. 
     In this respect, an automatic ice maker has been developed, which is provided inside a refrigerator but may discharge ices separated from the ice tray through a dispenser if necessary after automatically supplying water thereto and then making the ices. However, the ice maker of the related art needs much energy consumption, whereby improvement will be required in view of various aspects. 
     SUMMARY 
     Accordingly, the present disclosure is directed to an ice maker and a refrigerator including the same, which substantially obviate one or more problems due to limitations and disadvantages of the related art. 
     An object of the present disclosure is to provide an ice maker and a refrigerator including the same, in which ice separation is easily made to reduce energy consumption while ice separation is being made. 
     Another object of the present disclosure is to provide an ice maker and a refrigerator including the same, in which the cool air is easily transferred to ices during ice making to increase an ice making amount and thus improve energy efficiency. 
     Still another object of the present disclosure is to provide a refrigerator that may increase an ice making amount by increasing the time required to supply the cool air to an ice tray. Particularly, the present disclosure provides a refrigerator that may reduce the time required to make ices by allowing the cool air to be supplied to an ice making compartment only to concentrate the cool air supply to the ice making compartment without supplying the cool air to a freezing compartment. 
     Further still another object of the present disclosure is to provide a refrigerator that may efficiently use heat supplied from a heater by stopping an operation of an ice making compartment fan during ice separation. That is, the present disclosure provides a refrigerator that disperses heat of a heater if an ice making compartment fan is driven while ice separation is being made, thereby solving a problem caused as a temperature of an ice tray fails to be increased sufficiently. 
     Further still another object of the present disclosure is to provide a refrigerator that may prevent a temperature of an ice making compartment from being remarkably increased due to heat generated from a heater during ice separation to reduce a supply amount of the cool air required during ice making and thus improve energy efficiency. 
     Further still another object of the present disclosure is to provide a refrigerator that may increase the time required for ice making by more reducing RPM of an ejector in a state that a door is closed, than RPM of the ejector in a state that the door is not closed. That is, the present disclosure provides a refrigerator that may increase the time required to make ices to increase the amount of ices which are made by setting RPM of the ejector in a state that the door is closed, differently from RPM of the ejector in a state that the door is not closed. 
     Additional advantages, objects, and features of the disclosure will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the disclosure. The objectives and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, the present disclosure provides a refrigerator comprising a compressor for compressing a refrigerant, first and second evaporators to which the refrigerant compressed by the compressor is supplied, and a valve for forming a path that moves the refrigerant supplied from the compressor to either the first evaporator or the second evaporator. In this case, the valve may open or close the path toward any one of the two evaporators such that the path may be applied to a cooling cycle that uses one compressor and two evaporators. 
     Also, according to the present disclosure, in a driving cycle of a refrigerator provided with an ice maker, a compressor may continue to be driven even though a driving condition of a freezing compartment is satisfied, and an ice making compartment fan may be driven to sufficiently supply the cool air to an ice making compartment. Therefore, the amount of ices that may be generated in the refrigerator may be increased. 
     One embodiment comprises a first step of sensing whether to satisfy a temperature condition of a refrigerating compartment, a second step of sensing whether to satisfy a temperature condition of a freezing compartment if the first step is satisfied, and a third step of sensing whether to satisfy a temperature condition of the ice making compartment or whether the time required for ice making has passed if the second step is satisfied. 
     Also, the present disclosure may be applied to a refrigerator comprising an ice tray for receiving water to generate ices; a motor capable of being rotated in a forward or reverse direction; an ejector including a rotary shaft rotating the ices made in the ice tray to discharge the ices from the ice tray, rotated by being axially connected to the motor, and a protrusion pin protruded in a radius direction of the rotary shaft to adjoin the ices; and a heater for selectively supplying heat to the ice tray. 
     Driving of the ice making compartment fan may be stopped during ice separation, whereby the heating time may be reduced. This may reduce the ice making time, whereby the amount of ices that may be made may be increased. 
     One embodiment may comprise a first step of determining whether the ejector is rotated to reach a first setup position; a second step of driving the heater and stopping driving of an ice making compartment fan if the first step is satisfied; a third step of determining whether the ejector is rotated to reach a second setup position; and a fourth step of stopping driving of the heater if the third step is satisfied. 
     Also, the present disclosure may be applied to a refrigerator comprising an ice tray for receiving water to generate ices; a motor capable of being rotated in a forward or reverse direction; an ejector including a rotary shaft rotating the ices made in the ice tray to discharge the ices from the ice tray, rotated by being axially connected to the motor, and a protrusion pin protruded in a radius direction of the rotary shaft to adjoin the ices; a heater for selectively supplying heat to the ice tray; and a door switching sensor for sensing a storage compartment door&#39;s opening or closing, the storage compartment door being provided with the ejector. 
     In one embodiment, the ejector is rotated once during ice separation, and if the door provided with the ejector is opened and then it is sensed that the door is closed, the ejector is rotated twice, whereby the time required to rotate the ejector may be reduced. Therefore, the time required to rotate the ejector per day may be reduced, whereby the amount of ices that may be made per day may be increased. 
     One embodiment may comprise a first step of sensing whether the ejector starts to be rotated; a second step of checking whether the storage compartment door is closed; and a third step of rotating the ejector once if the storage compartment door is closed at the second step. 
     On the other hand, if the storage compartment door is not closed, the ejector may be rotated twice at the third step. 
     According to the present disclosure, since energy consumption is reduced during ice making or ice separation, energy efficiency of the refrigerator as well as the ice maker may be improved. 
     According to the present disclosure, since a contact area between water and the ice tray is increased, the water may quickly be cooled by the cool air. 
     Also, according to the present disclosure, since one ice making space of the ice tray has the same radius as that of another ice making space, ices may move more easily. 
     Also, since ices generated in the ice tray have a forward moving direction relatively thicker than a backward moving direction, it is not likely that the ices remain in the ice tray without being discharged from the ice tray, whereby reliability in ice separation of the ice maker may be improved. 
     Also, according to the present disclosure, since the time required to supply the cool air to the ice tray is increased, the ice making amount may be increased. 
     Also, according to the present disclosure, since an operation of the ice making compartment fan is stopped during ice separation, heat supplied from the heater may efficiently be used. Therefore, energy consumed by the heater is reduced, whereby overall energy efficiency of the refrigerator may be improved. 
     Also, according to the present disclosure, the amount of heat supplied by the heater to make ice separation is reduced, whereby the amount of the cool air to be supplied for later ice making may be reduced. That is, since ice making is available using less energy, energy consumed by the refrigerator may be reduced. 
     Also, according to the present disclosure, RPM of the ejector in a state that the door is closed is more reduced than that of the ejector in a state that the door is not closed, whereby the time required for ice making may be increased. Therefore, the time required to rotate the ejector within the same time may be reduced, whereby the amount of ices that may be made by the refrigerator may be increased. 
     It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the principle of the disclosure. In the drawings: 
         FIG.  1    is a perspective view illustrating that an ice maker according to the present disclosure is provided in a refrigerator door; 
         FIG.  2    is a perspective view illustrating an ice maker according to the present disclosure; 
         FIG.  3    is an exploded view illustrating an ice maker of  FIG.  2   ; 
         FIG.  4    is a perspective view illustrating the inside of a driving unit in  FIG.  3   ; 
         FIG.  5    is a right side view of  FIG.  4   ; 
         FIG.  6    is a left side view of  FIG.  4   ; 
         FIGS.  7 A to  7 C  are right side views illustrating an operation relation of a first rotation member in  FIG.  5   ; 
         FIGS.  8 A and  8 B  are left side views illustrating an operation relation of a second rotation member in  FIG.  6   ; 
         FIG.  9    is a view illustrating a process of discharging ices; 
         FIG.  10    is a view illustrating an example of a side cross-section of one ice making space; 
         FIG.  11    is a view illustrating an example of a front cross-section in  FIG.  10   ; 
         FIGS.  12  and  13    are views illustrating another example of  FIG.  11   ; 
         FIG.  14    is a view illustrating an example of a door provided with an ice maker; 
         FIG.  15    is a view illustrating a main portion in  FIG.  14   ; 
         FIG.  16    is a view illustrating that an ice tray is viewed from the front; 
         FIG.  17    is a view illustrating that a lower portion of an ice tray is viewed; 
         FIG.  18    is a view illustrating that an ice tray is viewed from a lower side; 
         FIG.  19    is a control block diagram illustrating one embodiment; 
         FIGS.  20 A and  20 B  are views illustrating an embodiment of a rotation path of an ejector; 
         FIGS.  21 A and  21 B  are views illustrating an embodiment of an ejector rotation gear; 
         FIG.  22    is a view illustrating another embodiment of an ejector rotation gear; 
         FIGS.  23 A and  23 B  are views illustrating an effect of the embodiments described in  FIGS.  20 A to  21 B ; 
         FIG.  24    is a control block diagram illustrating another embodiment; 
         FIG.  25    is a view illustrating a cooling cycle according to another embodiment; 
         FIG.  26    is a view illustrating an operation of a refrigerator according to another embodiment; 
         FIG.  27    is a control flow chart according to another embodiment; 
         FIG.  28    is a view illustrating an effect according to another embodiment; 
         FIG.  29    is a control flow chart according to still another embodiment; 
         FIG.  30    is a control flow chart illustrating an example modified from  FIG.  29   ; 
         FIG.  31    is a view illustrating an effect of the embodiments described in  FIGS.  29  and  30   ; and 
         FIG.  32    is a control flow chart according to further still another embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. 
       FIG.  1    is a perspective view illustrating that an ice maker according to the present disclosure is provided in a refrigerator door. 
     The ice maker may be applied to a bottom freezer type refrigerator in which a freezing compartment is arranged below a refrigerating compartment or a top mounting type refrigerator in which a freezing compartment is arranged on a refrigerating compartment. Also, the ice maker may be applied to a side by side type refrigerator in which a refrigerating compartment and a freezing compartment are arranged at both sides. 
     A refrigerator comprises a freezing compartment  20  and a refrigerating compartment  30 , in which contents are stored in a cabinet  10  constituting an external appearance. A freezing compartment door  22  and a refrigerating compartment door  32 , which are intended to open or close the freezing compartment  20  and the refrigerating compartment, are respectively provided on front surfaces of the freezing compartment  20  and the refrigerating compartment  30 . In this embodiment, a bottom freezing type refrigerator, in which the freezing compartment  20  is arranged below the cabinet  10 , is introduced, but the present disclosure is not limited to this bottom freezing type refrigerator. 
     The refrigerating compartment  30  is opened or closed at both sides in such a manner that two refrigerating compartment doors  32  are hinge-coupled with a side of a refrigerator main body, and the freezing compartment door  50  is opened or closed in a forward or backward direction of the refrigerator body in a sliding manner. 
     The freezing compartment door  22  and the refrigerating compartment door  32  may be arranged differently depending positions of the freezing compartment  20  and the refrigerating compartment  30 . For example, the refrigerator may be applied to a top mount type refrigerator, a two-door type refrigerator, etc. regardless of types. 
     An ice making compartment  40  may be provided in any one of the refrigerating compartment doors  32 . A sealed space surrounded by a frame is provided at a rear side of the refrigerating compartment door  32 , and may form the ice making compartment  40 . Since the ice making compartment  40  is adjacent to the refrigerating compartment  30 , it is preferable that the ice making compartment  40  is heat-insulated so as not to generate heat-exchange with the refrigerating compartment  30 . 
     The ice making compartment  40  may be provided inside the freezing compartment  20  or the refrigerating compartment  30 . However, considering a user&#39;s access convenience and efficiency in use of an inner space of the cabinet  10 , it is preferable that the ice making compartment  40  is provided in the refrigerating compartment door  32 . 
     The ice maker  100  according to the present disclosure is provided inside the ice making compartment  40 , and an ice bank  42  and a dispenser  44  are provided below the ice making compartment  40 , wherein ices are temporarily stored in the ice bank  42  and the dispenser  44  is to discharge ices in accordance with a user&#39;s request. 
     A perspective view illustrating an external appearance of the ice maker  100  is shown in  FIG.  2   , and an exploded view illustrating the ice maker  100  is shown in  FIG.  3   . 
     The ice maker  100  of the present disclosure includes an ice tray  100  to which water supplied to make ices, an ejector  120  rotated to take out ices made in the ice tray, a heater  40  provided to be in contact with the ice tray, selectively heating the ice tray to easily separate the ices from the ice tray, a case  1502  mounted at one side of the ice tray, and a brushless direct current motor (BLDC)  1510  mounted inside the case  1502 , selectively rotating the ejector  120  to enable forward rotation and backward rotation. 
     The ice tray  110  is a structure where ices are formed by water supply, and has a semi-cylindrical shape with an opened upper portion to store water and ices therein as shown in  FIG.  3   . 
     A plurality of partition ribs  112  for partitioning the inner space of the ice tray  110  into a plurality of ice making spaces are provided inside the ice tray  110 . The plurality of partition ribs  112  are formed to be extended upwardly inside the ice tray  110 . The plurality of partition ribs  112  may allow a plurality of ices to be simultaneously made in the ice tray. 
     A water supply unit  130  is provided at a right upper portion of the ice tray  110  to allow water to be supplied from an externally connected water supply hose (not shown) to the ice tray  110 . 
     The water supply unit  130  has an opened upper portion, and is preferably provided with a water supply unit cover  132  for preventing water from splashing during water supply. 
     Meanwhile, the ice tray  110  includes an anti-overflow wall  115  for preventing water from overflowing, formed to be extended from a rear upper surface to an upward direction. If the ice maker  100  is provided in the refrigerating compartment door  32 , water supplied to the ice tray  110  may overflow in accordance with movement of a door which is generally rotated to be opened or closed. Therefore, the anti-overflow wall  115  forms a high wall at a rear side of the ice tray  110  to prevent water inside the ice tray  110  from overflowing toward the rear of the ice tray  110 . 
     The ejector  120  includes a rotary shaft  122  and a plurality of protrusion pins  124 . The rotary shaft  122  is arranged at an upper side inside the ice tray  110  to cross the center in a length direction as shown in  FIG.  3   . The inner surface of the ice tray  110  has a semi-cylindrical shape having the center of the rotary shaft  122  as the center. The plurality of protrusion pins  124  are extended to an outer circumference of the rotary shaft  122  in a radius direction. It is preferable that the plurality of protrusion pins  124  are formed at the same interval along the length direction of the rotary shaft  122 . Particularly, the plurality of protrusion pins  124  are arranged one by one per space partitioned in the ice tray  110  by the partition ribs  112 . 
     The heater  140  is arranged below the ice tray  110 . The heater  140  is a heat transfer heater, and is preferably formed in a U shape. The heater  140  heats the surface of the ice tray  110  to slightly melt ice on the surface of the ice tray  110 . Therefore, when the ejector  120  separates ices while being rotated, ices on the surface of the ice tray  110  may easily be separated from the surface of the ice tray  110 . 
     Meanwhile, a plurality of discharge guides  126  for guiding ices separated by the ejector  120  to be dropped on the ice bank  42  arranged below the ice maker  100  are provided above the front of the ice tray  110 . The plurality of discharge guides  126  are fixed to corner portions at the front of the ice tray  110  and extended to be close to the rotary shaft  122 . A predetermined gap exists between the plurality of discharge guides  126 . When the rotary shaft  122  is rotated, the protrusion pins  124  pass through the gap. It is preferable that the discharge guide  126  has an upper surface inclined to be higher toward its end, that is, the rotary shaft  122  to allow ices to be slid to the front by means of self-load. 
     Preferably, the ice tray  110  further includes an anti-overflow member  116  for preventing water from overflowing toward the front of the ice tray, provided below the discharge guide  126 . Preferably, the anti-overflow member  116  is made in a plate shape to prevent water from overflowing, and is made of a flexible plastic material. 
     Also, when the ejector  120  is rotated, the anti-overflow member  116  are formed provided with “T” shaped slits  117  per position corresponding to the protrusion pins  124  such that the protrusion pins  124  may pass through the anti-overflow member  116 . Since the anti-overflow member  116  is made of a flexible material, when the protrusion pins  124  pass through the slit  117 , the slit  117  may generate a gap while being deformed, and then may be restored after the protrusion pins  124  pass therethrough. 
     A driving device  150  for selectively rotating the ejector  140  is provided at an opposite side of the water supply unit  130  in the ice tray  110 . 
     The driving device  150  is provided inside the case  1502  to protect inner parts, and includes a motor  1504  (see  FIG.  4   ) inside the case  1502  as described later. The driving device  150  selectively supplies a power source to the motor  1510  and the heater  140 . 
     Also, the motor  1510  selectively rotates a full-ice sensing bar for sensing whether the ice bank  42  arranged below the ice maker  100  is fully filled with ices. 
     Meanwhile, a switch  1505  for experimentally operating the ice maker  100  is provided at the front of the driving device  150 . If the switch  1505  is pushed for several seconds or more, the ice maker  100  is operated in a test mode to identify whether there is a problem in the ice maker  100 . 
     The ice maker  100  is provided with an air guide  166  arranged to surround the front below the ice tray  110 . The air guide  166  is provide to surround the front of the ice tray  110 , a cool air moving path is formed between the air guide  166  and the front surface of the ice tray  110 , and a plurality of cool air discharge holes  169  are preferably arranged at the center of the front portion  168  from side to side. The cool air guided to the lower portion of the ice tray  110  may be discharged to the front surface of the ice maker  100  through the cool air discharge holes  169 . 
     Also, it is preferable that a plurality of fins  114  are formed on the entire surface of the ice tray  110  spaced apart from the front portion  168 . The fins  114  may expedite heat transfer to the ice tray  110  when the cool air is discharged through the cool air discharge holes  169 , whereby water may quickly be cooled to quickly generate ices. 
     The front portion  168  of the air guide  166  may be formed in a single body with the discharge guide  126 . In this case, the discharge guide  126  and the anti-overflow member  116  may be fixed to each other using a plurality of screws at the front on the ice tray  110 , whereby the front portion  168  may be fixed to the front surface of the ice tray  110  to be spaced apart from the ice tray  110  at a predetermined interval. 
     Next, a structure of the driving device will be described with reference to  FIGS.  4  to  8 B . 
     The driving device  150  includes a case  1502  mounted at one side of the ice tray, and a motor  1510  mounted inside the case, selectively rotating the ejector. 
     The case  1502  has a cuboid shape, is provided with mounting portions such as various gears and cams therein, and has an opened side to which a cover is coupled. 
     The motor  1510  rotates the rotary shaft  122  of the ejector  120  at a predetermined angle in a forward or backward direction. To this end, the motor  1510  is preferably a motor that enables forward or backward rotation. Particularly, the motor  1510  is preferably a brushless direct current motor (BLDC). 
     If the motor  1510  is rotated in a forward or backward direction, a complicated connection structure of a gear and cam for rotating the ejector  120  in a forward or backward direction is not required, and it is easy to rotate the full-ice sensing bar  170 , in a forward or backward direction, which should be rotated at a predetermined angle in a forward or backward direction. 
     Also, if the brushless direct current motor is used, since a volume of the motor is smaller than the case that the direct current motor is used, the driving device may have a small volume, whereby the ice tray  110  may be made more greatly in a limited space. 
     The motor  1510  is deaccelerated through a plurality of reduction gears  1511 ,  1512 ,  1513  and  1514  and then axially coupled to the rotary shaft  122  of the ejector  120  to rotate an ejector rotation gear  1520  for rotating the ejector. At this time, since the motor  1510  may be rotated in a forward or backward direction, if the motor is rotated in a first direction, the ejector is rotated in the first direction, and if the motor is rotated in a second direction, the ejector is rotated in the second direction. 
     Also, the plurality of four reduction gears  1511 ,  1512 ,  1513  and  1514  are shown, a reduction ratio and the number of the plurality of reduction gears may be controlled properly in accordance with specification of the motor  1510 . 
     Preferably, the motor  1510  is connected to a circuit board  1580  provided at one side inside the case  1502  and thus supplied with a power source. 
     It is preferable that the driving device  150  further includes a first sensor unit for sensing a position of a rotation angle of the ejector, and a second sensor unit for sensing a rotation angle position of the full-ice sensing bar. Each of the first sensor unit and the second sensor unit may include a hall sensor to sense related information. 
     A first cam portion  1522  provided with two grooves made of a disk type and formed at a predetermined angle position on the outer circumference is provided at one side of the ejector rotation gear  1520 . The two grooves include a first groove  1523  for defining an initial rotation angle position of the ejector  120  and a second groove  1524  formed to be spaced apart from the first groove  1523  at a predetermined angle. The first groove  1523  is formed at the same depth as that of the second groove  1524 , and is preferably formed at an angle greater than that of the second groove  1524 . 
     A first rotation member  1530  interworking with the first cam portion  1522  in contact with the first cam portion  1522  is provided at one side of the ejector rotation gear  1520 . The first rotation member  1530  is provided with a first protrusion  1532  at one side, and the first protrusion  1532  is rotated while sliding along the outer circumference and two grooves of the first cam portion  1522 . 
     A magnet  1534  is provided at an end of the first rotation member  1530 , and a first hall sensor  1536  for measuring a voltage signal generated as the magnet  1534  approaches to a position close to the magnet  1534  is provided. 
     The first hall sensor  1536  is a sensor based on a hall effect of a voltage generated when the magnet  1534  approaches thereto. Since the first hall sensor  1536  is a sensor to which a current flows, it is preferable that the first hall sensor  1536  is installed in the circuit board  1580 . 
     Since the first rotation member  1530  is pulled to be always in contact with the first cam portion  1522 , a first elastic member  1538  is provided between one side of the first rotation member  1530  and a lower fixed position in the case  1502  to be in contact with the first cam portion  1522  by downwardly pulling the first rotation member  1530 . 
     As shown in  FIG.  5   , in this embodiment, the first elastic member  1538  may be installed to be hung between a protrusion downwardly protruded from a middle portion of the first rotation member  1530  and a ring protruded from a position where a temperature sensor  182 , which will be described later, is fixed. 
     The first sensor unit, which includes the first rotation member  1530  and the first hall sensor  1536 , may sense a rotation angle of the ejector  120  by sensing a position signal, which corresponds to a case that the first protrusion  1532  is inserted into the first groove  1523  and the second groove  1524  of the first cam portion  1522 , when the ejector rotation gear  1520  is rotated. 
     Meanwhile, a temperature sensor unit  180  is provided inside the case  1502  of the driving device  150  to adjoin a side of the ice tray  110  coupled to the side of the case  1502 . The temperature sensor unit  180  includes a temperature sensor  182  for measuring a voltage signal according to a temperature of the ice tray  110 , and a conducting plate  184  of a metal material interposed to prevent water permeation with the ice tray  110 . 
     The temperature sensor  182  may be buried in a rubber of a waterproof and elastic material, and may be fixed to one side of the case  1502 . Since the temperature sensor  182  is to measure a temperature of the ice tray  110 , an opening portion, through which the temperature sensor  182  may be exposed, is formed at one side of the case  1502  made of a plastic material. 
     The temperature sensor  182  is not directly in contact with the ice tray  110  but in contact with the ice tray  110  through the conducting plate  184 . Therefore, the conducting plate  184  may prevent water permeation by blocking the opening portion formed at one side of the case  1502  and at the same time measure a temperature of the ice tray  110  to be conducted to the temperature sensor  182 . The conducting plate  184  may be made of a metal material having high heat conductivity, and may be fixed to one side of the case  1502  by insert molding after a plate of a stainless material is formed. 
     Also, since the temperature sensor  182  measures a voltage change according to a temperature change, the temperature sensor  182  is connected with the circuit board  1580  by a wire. 
     Next, a side view illustrating that the inside of the driving device is viewed from a left side is shown in  FIG.  6   . 
     A disk type second cam portion  1526  having a diameter corresponding to a half of a diameter of the ejector rotation gear  1520  is provided at a left side of the ejector rotation gear  1520 . A groove  1527  is formed at one side of the second cam portion  1526 . 
     A second rotation member  1540  rotated by interworking with the second cam portion  1526  is provided near the second cam portion  1526 . The second rotation member  1540  is rotated at the front of the second cam portion  1540 , and is entirely provided to surround the center of the ejector rotation gear  1520 . A second protrusion  1546  is formed on a surface at one end of the second rotation member  1540 , that is, a surface toward the second cam portion  1526  to be vertical to the surface, whereby a side of the second protrusion  1546  is in contact with an outer circumference of the second cam portion  1526 . 
     The other end of the ejector rotation gear  1520  receives an elastic force to be upwardly rotated by the second elastic member  1554 . The second elastic member  1554  has both ends longitudinally spread in a spring type, and provides an elastic force spread in a radius direction unlike the first elastic member  1538  that provides an elastic force pulled in a length direction. One side of the second elastic member  1554  is installed to be hung in a ring portion protruded at the other end of the ejector rotation gear  1520 , and other side of the second elastic member  1554  is installed to be hung on one surface of the case. 
     A protrusion  1528  is formed at one side of the front of the second cam portion  1526  in the rotary shaft of the ejector rotation gear  1520  in a radius direction. The protrusion  1528  is mounted to be rotated at a predetermined angle range with respect to the rotary shaft of the ejector rotation gear  1520 . The protrusion  1528  is rotated at a predetermined angle in the same direction as that of the ejector rotation gear  1520  when the ejector rotation gear  1520  is rotated counterclockwise, whereby the second protrusion  1546  of the second rotation member  1540  may be inserted into the groove  1527  of the second cam portion  1526 . On the other hand, the protrusion  1528  is rotated at a predetermined angle in the same direction as that of the ejector rotation gear  1520  when the ejector rotation gear  1520  is rotated clockwise, and is hung in a side of one end of the second protrusion  1546  of the second rotation member  1540 , whereby the second protrusion  1546  cannot be inserted into the groove  1527  of the second cam portion  1526  and thus the second rotation member  1540  cannot be rotated. 
     In other words, the protrusion  1528  may upwardly rotate the second rotation member  1540  only when the ejector rotation gear  1520  is rotated counterclockwise. 
     An arc shaped large gear portion  1542  is formed at the other end of the ejector rotation gear  1520  and thus coupled with a rotation force transfer gear  1550 . Since the arc shaped large gear portion  1542  is rotated in the range of a predetermined angle, the large gear portion  1542  is formed in an arc shape. 
     The rotation force transfer gear  1550  includes an arc shaped small gear portion  1551  rotated to be engaged with the arc shaped large gear portion  1542 , and an arc shaped large gear portion  1552  engaged with the ejector rotation gear  1520 , rotating the ejector rotation gear  1520 . 
     Since a rotation angle of the rotation force transfer gear  1550  becomes greater than the arc shaped large gear portion  1542  but does not exceed 180°, the small gear portion  1551  and the large gear portion  1552  may be formed in an arc shape. The arc shaped large gear portion  1552  rotates a full-ice sensing bar rotation gear  1560  to which one end of the full-ice sensing bar  170  is axially coupled. 
     A third elastic member  1558  is provided between the arc shaped small gear portion  1551  and the arc shaped large gear portion  1552 , wherein the arc shaped large gear portion  1552  is rotatably coupled to the third elastic member  1558  relatively with respect to the arc shaped small gear portion. The third elastic member  1558  is a spring fitted into the rotary shaft of the rotation force transfer gear  1550 , and its one end is supported in the arc shaped large gear portion  1552  and its other end is supported in the arc shaped small gear portion  1551 , whereby an elastic force is provided in an opening direction. Therefore, when the full-ice sensing bar  170  is rotated and descends to sense whether the ice bank  42  has been fully filled with ices, even though the full-ice sensing bar  170  is not rotated any more due to the ices fully filled in the ice bank  42 , the third elastic member  1558  may be rotated at a predetermined angle, whereby the gears coupled with each other are not damaged. 
     The magnet  1564  is fixed to one side of the full-ice sensing bar rotation gear  1560 , and a second hall sensor  1566  may be installed at one side below the circuit board  1580 . The second hall sensor  1566  may be provided in a protruded shape in view of a relative position with the magnet  1564 . 
     The magnet  1564  is rotated together with the full-ice sensing bar rotation gear  1560  as the full-ice sensing bar rotation gear  1560  is rotated. The magnet  1564  is the closest to the second hall sensor  1566  in a position where the full-ice sensing bar  170  is rotated toward the lowest portion, whereby the second hall sensor  1566  senses a signal at the time when the magnet  1564  is the closest to the second hall sensor  1566 . That is, if the second hall sensor  1566  senses that the full-ice sensing bar  170  is upwardly rotated, descends and then is rotated toward the lowest position, the second hall sensor  1566  may sense that the ice bank  42  cannot be fully filled with ices. 
     Meanwhile, the circuit board  1580  is connected with a switch  1505  provided inside the case  1502  of the driving device  150  and partially protruded to the outside of the case  1502 . Also, the circuit board  1580  is connected with the motor  1510  to adjoin the motor  1510 , includes the first and second hall sensors  1536  and  1566  installed therein, and is connected with the temperature sensor  182  provided inside the case  1502  by a wire. 
     The circuit board  1580  performs a test mode in accordance with an action signal of the switch  1505 , rotates the motor  1510  in a forward direction or backward direction by operating the motor  1510 , and transfers sensing signals of the first and second hall sensors  1536  and  1566  and the temperature sensor  182  to a main controller (not shown) provided in the refrigerator main body. Also, the circuit board  1580  operates the motor  1510  by receiving an operation command signal from the main controller. 
     Since the circuit board  1580  does not include a controller for controlling the ice maker  100  unlike the related art, its size may be made with a very small size. Instead, the circuit board  1580  may transfer a sensing signal and a command signal to the main controller, whereby the main controller may control the ice maker  100 . 
     Next, operations of the first rotation member and the second rotation member will be described with reference to  FIGS.  7 A to  8 B . 
       FIGS.  7 A to  7 C  illustrate some of inner elements of the driving device, wherein an operation state of the first hall sensor unit is viewed from a right side, that is, a side where the ejector exists. 
     First of all,  FIG.  7 A  illustrates a state that the protrusion pins  124  of the ejector  120  are arranged in an initial position (this position is referred to as a “first position”). At this time, since the first protrusion  1532  of the first rotation member  1530  is inserted into the first groove  1523  of the first cam portion  1522 , the first rotation member  1530  is pulled by the first elastic member  1538  and downwardly rotated. Since the first hall sensor  1536  is spaced apart from the magnet  1534 , the first hall sensor  1536  fails to sense a signal. 
     Next,  FIG.  7 B  illustrates a state that the protrusion pins  124  of the ejector  120  are upwardly rotated by a reverse rotation of the motor at a predetermined angle for full-ice sensing (this position is referred to as a “second position”). At this time, since the first protrusion  1532  of the first rotation member  1530  is inserted into the second groove  1524  of the first cam portion  1522 , the first rotation member  1530  is pulled by the first elastic member  1538  and downwardly rotated. Even at this time, since the first hall sensor  1536  is spaced apart from the magnet  1534 , the first hall sensor  1536  fails to sense a signal. 
     When the first protrusion  1532  passes through the outer circumference between the first groove  1523  and the second groove  1524  of the first cam portion  1522 , since the first protrusion  1532  is pushed up by the outer circumference of the first cam portion  1522 , the first rotation member  1530  is upwardly rotated in spite of a pulling force of the first elastic member  1538  as shown in  FIG.  7 C . At this time, since the first hall sensor  1536  is spaced apart from the magnet  1534 , the first hall sensor  1536  senses a signal. 
     That is, the first hall sensor  1536  continuously senses a signal when the first protrusion  1532  passes through the outer circumference not the first and second grooves  1523  and  1524  of the first cam portion  1522 , and stops from sensing a signal when the first protrusion  1532  is inserted into the first and second grooves  1523  and  1524  of the first cam portion  1522 , whereby the rotation angle position of the ejector  120  may be determined. 
     Meanwhile, if the ejector rotation gear  1520  moves to the position of  FIG.  7 B , the full-ice sensing bar  170  is rotated to upwardly move in accordance with the operation of the second rotation member  1540  as described later. 
     In case of the full-ice sensing operation, the ejector rotation gear  1520  is rotated from the initial position of  FIG.  7 A  to the position of  FIG.  7 B  and then rotated to the position of  FIG.  7 A  (rotated clockwise and then rotated counterclockwise). This means that the motor  1510  rotates the ejector rotation gear  1520  at a predetermined angle in a backward direction and then rotates the ejector rotation gear  1520  in a forward direction. Therefore, as the full-ice sensing bar  170  is rotated from the downward position as shown in  FIG.  7 A  to the upward position as shown in  FIG.  7 B  and then descends toward the downward position, the second hall sensor  1566  senses whether the full-ice sensing bar  170  descends as much as possible, as described later. 
     If the full-ice sensing bar  170  descends to the maximum downward position as shown in  FIG.  7 A , it may be determined that the ice bank  42  is not fully filled with ices, and if the full-ice sensing bar  170  fails to descend to the maximum downward position due to ices in the middle of descending toward the downward position, it may be determined that the ice bank  42  is fully filled with ices. 
     If it is determined that the ice bank  42  is not fully filled with ices, the heater  140  is first heated and then the ejector  120  is rotated at 360° in a forward direction (counterclockwise direction). Then, the ices in the ice tray  110  are separated from the ice tray  110  and dropped onto the ice bank  42 . A middle state that the ejector  120  is rotated for ice separation is shown in  FIG.  7 C . At this state, since the magnet  1534  is maintained to be close to the first hall sensor  1536 , the state of  FIG.  7 C  is maintained until the first rotation member  1530  is rotated to descend, and the first hall sensor  1536  continues to sense this state. 
     In this case, when the ejector  120  reaches the second position of  FIG.  7 B  prior to returning to the initial position (the first position), the heated heater  140  is turned off. Since the heater  140  is an electric heating appliance and needs much power consumption, it is possible to reduce power consumption by reducing the heater operation time. 
     Next,  FIGS.  8 A and  8 B  illustrate that the full-ice sensing bar  170  is rotated and the second hall sensor  1566  senses the rotation of the full-ice sensing bar  170  as the second rotation member  1540  is rotated. 
       FIG.  8 A  illustrates the state that the second rotation member  1540  is downwardly rotated because the outer circumference of the second cam portion  1526  pushes the second protrusion  1546  when the ejector  120  is in the first position. At this time, since the protrusion  1528  is inserted into a side of one end of the second rotation member, the groove  1527  is hung in the protrusion  1528  even through the groove  1527  reaches the position of the protrusion  1528 , whereby the second rotation member  1540  cannot be rotated downwardly. 
     In this state, the arc shaped large gear portion  1542  formed at the other end of the second rotation member  1540  rotates the rotation force transfer gear  1550  counterclockwise. Therefore, the full-ice sensing bar rotation gear  1560  is rotated clockwise, and thus the full-ice sensing bar  170  descends to the downward position. At this time, since the magnet  1564  is arranged at an opposite side of the full-ice sensing bar  170 , the magnet  1564  approaches to the second hall sensor  1566 , whereby a sensing signal is generated in the second hall sensor  1566 . 
       FIG.  8 B  illustrates the state that the ejector  120  is rotated to the second position. At this time, the protrusion  1528  is rotated and come out and at the same time the second cam portion  1526  is also rotated and reaches the position of the second protrusion  1546 . Therefore, the second protrusion  1546  is inserted into the groove  1527  of the second cam portion  1526  by an elastic force of the second elastic member  1554 , and the second rotation member  1540  is upwardly rotated. 
     In this state, the arc shaped large gear portion  1542  formed at the other end of the second rotation member  1540  rotates the rotation force transfer gear  1550  clockwise. Therefore, the full-ice sensing bar rotation gear  1560  is rotated counterclockwise, and thus the full-ice sensing bar  170  ascends to the upward position. At this time, since the magnet  1564  arranged at an opposite side of the full-ice sensing bar  170  is far away from the second hall sensor  1566 , a sensing signal is stopped in the second hall sensor  1566 . 
     As described above, during full-ice sensing operation, the full-ice sensing bar  170  moves from the position of  FIG.  8 A  to the position of  FIG.  8 B  and then senses full-ice while descending to the position of  FIG.  8 A . 
     When the ejector  120  is rotated for ice separation in a forward direction, the ejector rotation gear  1520  is rotated clockwise (counterclockwise based on  FIGS.  7 A to  7 C ) in  FIGS.  8 A and  8 B . At this time, since the protrusion  1528  is hung in one end of the second rotation member  1540 , the second rotation member  1540  is not rotated, whereby the full-ice sensing bar  170  is maintained at a descending state as shown in  FIG.  8 A . 
     Next, a procedure of discharging ices and a control method of an ice maker will be described with reference to  FIG.  9   . 
     First of all, if the ice maker  100  is initially driven, the rotation angle position of the ejector is identified using the first hall sensor, whereby the ejector  120  reaches the initial position. 
     Next, water of a predetermined content is supplied to the ice tray  110  and it is in a standby mode for a freezing time when water is frozen by the cool air. At this time, a temperature of the ice tray  110  may be measured through the temperature sensor  182 , whereby water has been completely phase-changed to ices. 
     Next, the full-ice sensing bar  170  is rotated to determine whether the ice bank  42  provided below the ice maker  100  is fully filled with ices. If it is determined that the ice bank  42  is fully filled with ices, it is periodically sensed whether the ice bank  42  is fully filled with ices, and it is in a standby mode in a state that ice separation is stopped until it is determined that the ice bank  42  is not fully filled with ices. To determine full-ice, the ejector is rotated in an opposite direction of the rotation direction of the ejector shown in  FIG.  9   . That is, although the protrusion pins  124  of the ejector are rotated counterclockwise, the protrusion pins  124  are rotated clockwise to sense full-ice. 
     Next, if it is determined that the ice bank  42  is not fully filled with ices, the heater  140  is heated. The heater  140  is heated for a predetermined time before the ejector starts to be rotated. The heating operation may be performed continuously, may be performed intermittently at a predetermined period, or may be performed at a very short pulse period. 
     Next, when a predetermined time passes after the heater  140  is heated, or when the temperature of the ice tray  110 , which is measured by the temperature sensor, is a predetermined temperature or more, the ejector is rotated in a forward direction (clockwise) to separate ices in the ice tray  110  from the ice tray  110 . 
     At this time, the heater  140  continues to maintain a heating state even after the ejector  120  starts to be rotated, and is turned off before the ejector  120  turns to the initial position. That is, as described above, the first hall sensor  1536  senses that the protrusion pins  124  of the ejector  120  reach the second position and turns off the heater  140  at that time. 
     When the ejector  120  is rotated for ice separation, since ices are already separated during rotation of 300°, unnecessary operation of the heater may be reduced. 
     The ejector  120  may be rotated twice not one time during ice separation. The reason why that the ejector  120  is rotated twice is to make sure of complete ice separation in preparation for a case that ices may not be completely separated when the ejector  120  is rotated one time. Also, the ices separated from the ice tray may be hung between the protrusion pins  124  of the ejector  120  when the ejector  120  is rotated one time. As the ejector  120  is rotated twice, the ices separated from the ice tray may make sure of being dropped onto the ice bank  42 . 
     The embodiment that the time when ices are generated in the ice tray may be reduced and ice separation may easily be made will be described with reference to  FIGS.  10  and  11   . 
     In one embodiment, an ice making method includes performing heat absorption through heat transfer by supplying the cool air generated by an evaporator to the ice tray for storing water of the ice maker, performing heat absorption through heat transfer between the ice tray and water, and making ices by reducing a temperature of water to a temperature of a freezing point or less. At this time, ice making performance of the refrigerator is determined by a speed of water received in the ice tray  110 , which is reduced to a certain temperature of a freezing point or less, and is improved if efficiency of the heat transfer is increased. Therefore, this embodiment is focused on increase of efficiency of heat transfer Qice between water and the cool air generated from the evaporator. 
     A method for increasing a contact electric heating area to increase heat transfer Qice is applied to this embodiment. 
     In one embodiment, a protrusion portion  400  provided to be protruded toward an inner space and longitudinally extended along a rotation direction of the ices is provided in a cell which is one space partitioned by the partition rib  112 .  FIG.  10    is a view illustrating a side cross-section of a cell, and  FIG.  11    is a view illustrating a front cross-section of the ice tray. 
     Since the protrusion portion  400  is protruded toward an inner side of the cell, an inner area of the cell, which may be in contact with water, is increased. Therefore, the cool air supplied to the ice tray  110  may quickly be transferred to water through heat transfer with water received in the cell, and a generating speed of ices may be improved. 
     In  FIG.  10   , ices made by the ice tray  110  are rotated to draw an arc from a direction ‘c’ to a direction ‘b’ by means of the protrusion pin  124  of the ejector  1200  rotated counterclockwise, whereby the ices are dropped onto the lower end of the ice tray  110  through a space ‘d’. Therefore, the protrusion portion  400  for increase of the electric heating area has a vertical cross-section to be matched with the rotation direction of the ices for a certain interval. 
     Also, since the protrusion portion  400  is protruded toward the inner side of the ice making space of the ice tray  110 , a water level of water supplied to the ice tray is increased as much as a volume of the protrusion portion  400 , whereby the volume of the protrusion portion  400  should be restricted such that a distance between the increased water level and the rotary shaft  122  is not shorter than a certain distance. 
     Also, a shape of the protrusion portion  400  becomes smaller in the portion ‘b’ of the ice than the portion ‘c’ of the ice, and a center of gravity should be given to a moving direction of the ices until the ices are dropped onto portion ‘d’, whereby the ices should be guided to be normally dropped. Therefore, a height of the protrusion portion  400  is preferably maintained such that the portion ‘c’ is higher than a normal water supply level and the portion ‘b’ is lower than the normal water supply level. At this time, the portion ‘c’ should be higher than a maximum water level such that the protrusion portion  400  may not act as a resistance when the ices move for ice separation. 
     It is preferable that the one cell is formed as a space having a certain radius with respect to the rotation direction of the ices. The protrusion pin  124  guides the ice made in the one cell to be pushed counterclockwise and discharged from the ice tray  110 . Since the protrusion pin  124  is a member having a certain size, the protrusion pin  124  uniformly pushes the ice even though the rotation position is varied in the cell. Therefore, if a radius in the cell is varied depending on the rotation angle of the protrusion pin  124 , a force of the protrusion pin  124 , which is applied to the ice, may be varied, whereby various difficulties may occur when the ices are discharged from the ice tray  110 . 
     However, in this embodiment, since the cell is formed to have a certain radius therein, the force of the protrusion pin  124 , which is applied to the ice, may be maintained uniformly, whereby reliability in ice discharge may be improved. 
     Referring to  FIG.  11   , the protrusion portion  400  includes a first protrusion  410  and a second protrusion  420 , which are spaced apart from each other at a certain interval. A recess  430  which is recessed is formed between the first protrusion  410  and the second protrusion  420 . The recess  430  may not be more recessed than the other portion of the bottom surface of the cell. That is, the recess  430  may be arranged to have a height lower than that of the upper end of the protrusion portion  400 . 
     The distance between the first protrusion  410  and the second protrusion  420  may be greater than the width of the protrusion pin  124 . If the protrusion pin  124  is rotated to rotate the ice, the protrusion pin  124  passes between the first protrusion  410  and the second protrusion  420 . To increase a contact area of the protrusion pin  124  with the ice when the protrusion pin  124  moves the ice in contact with the ice, it is preferable that one end of the protrusion  124  is downwardly extended to a height lower than the upper end of the protrusion portion  400 . In this case, if the protrusion portion  400  interrupts movement of the protrusion pin  124 , the ice cannot be discharged smoothly. Therefore, it is preferable that the protrusion pin  124  is not in contact with the protrusion portion  400 . 
     One end of the protrusion pin  124  is extended to be arranged between the protruded height of the protrusion portion  400  and the bottom surface of the cell. That is, one end of the protrusion pin  124  is extended to be arranged between the upper end of the protrusion portion  400  and the bottom surface of the recess  430 . 
     In the protrusion pin  124 , a portion close to the rotary shaft  122  has a relatively wide width, whereas a portion far away from the rotary shaft  122  may have a relatively narrow width. Therefore, when the protrusion pin  124  pushes the ice, the protrusion pin  124  may stably transfer the rotation force of the ejector to the ice. 
     Referring to  FIG.  10   , the protrusion portion  400  may have an arc shape along an inner shape of the cell. That is, the protrusion portion  400  may be formed to make an arc along the bottom surface of the cell. 
     Extended heights at both ends of the protrusion portion  400  in the cell may be different from each other. That is, the protrusion portion  400  is arranged such that an angle of a start position based on a circle is asymmetrical to an angle of an end position based on the circle. 
     One end  400   a  of the protrusion portion  400  may be extended to be higher than the maximum water level of water supplied to the cell. A water supply valve for supplying water to the cell is controlled by a controller such that the amount of water supplied to the cell may not exceed the maximum water level. At this time, the controller may measure the amount of water by means of a flow rate sensor that passes through the water supply valve. 
     Therefore, one end  400   a  of the protrusion portion  400  is arranged to be higher than the ice frozen in the cell. In this case, the ice may be prevented from failing to move due to the protrusion portion  400  in which the ice is hung when the protrusion pin  124  rotates the ice in contact with the ice in an area adjacent to ‘c’ to move the ice. That is, since the ice of a portion adjacent to ‘c’ is frozen while having the shape of the protrusion portion  400 , the ice is not hung in the protrusion portion  400 . 
     Meanwhile, the portion ‘c’ means a portion where the protrusion pin  124  starts to be rotated in contact with the ice to discharge the ice from the ice tray  110 . In  FIG.  10   , the protrusion pin  124  is rotated counterclockwise to discharge the ice. 
     The other end  400   b  of the protrusion portion  400  may be extended to be lower than the maximum water level of water supplied to the cell. That is, the other end  400   b  of the protrusion portion  400  is extended to a height lower than one end  400   a  of the protrusion portion  400 . 
     Also, the other end  400   b  of the protrusion portion  400  may be extended to be lower than the normal water level of water supplied to the cell. That is, the other end  400   b  of the protrusion portion  400  is extended to a height lower than one end  400   a  of the protrusion portion  400 . 
     In the portion adjacent to ‘b’, the protrusion portion  400  is extended to a height lower than the portion adjacent to ‘c’. At this time, the portion adjacent to ‘b’ means an opposite portion of a portion where the protrusion pin  124  starts to be rotated in contact with the ice to discharge the ice from the ice tray  110 . 
     When the protrusion pin  124  pushes the ice and then reaches the position of ‘b’ based on  FIG.  10   , the ice should be discharged to the portion ‘d’ by self-load after ascending to the upper side of the discharge guide  126  (see  FIGS.  3  and  9   ). The discharge guide  126  has one side inclined to discharge the ice, and a center of gravity of the ice is preferably arranged in an inclined direction to smoothly discharge the ice. 
     In one embodiment, since the portion adjacent to ‘c’ is a portion positioned at the front of rotation and movement of the ice, a volume occupied by the protrusion portion  400  in the cell is reduced, and a volume occupied by water is increased. Therefore, the volume of the ice is more increased in the portion adjacent to ‘c’ in the cell than the portion adjacent to ‘b’, and the center of gravity of the ice when the ice moves is arranged in the portion where water is frozen in the portion adjacent to ‘c’. Therefore, since the ice may easily move through the discharge guide  126 , reliability of ice discharge may be improved. 
     Meanwhile, the upper end of the protrusion portion  400  may be formed to be rounded to constitute a curve. Since the portion where the ice tray  110  is in contact with the ice is formed to be rounded, friction that may occur when the ice moves from the ice tray may be reduced. 
       FIGS.  12  and  13    are views illustrating another example of  FIG.  11   . 
     As shown in  FIG.  12   , the upper end of the protrusion portion  400  may be formed to be angulated. Also, as shown in  FIG.  13   , the upper end of the protrusion portion  400  may be formed to constitute a flat surface. The protrusion portion  400  may be formed in a shape that may be protruded into the cell to increase a contact area with water. It is preferable that the protrusion portion  400  is formed in a shape that does not increase resistance greatly when the ice moves inside the cell. 
       FIG.  14    is a view illustrating an example of a door provided with an ice maker, and  FIG.  15    is a view illustrating a main portion in  FIG.  14   . 
     The ice making compartment  40 , which may form ice to provide a user with the ice, is provided inside the refrigerating compartment door  32 . 
     The ice maker  100 , which may form ice, is provided at the upper side of the ice making compartment  40 , and the ice bank  42 , in which the ices discharged from the ice maker  100  are received, is provided at the lower portion of the ice maker  100 . 
     Meanwhile, an inlet  34  to which the cool air from the evaporator provided in the cabinet of the refrigerator is transferred is formed at one side of the door  32 . If the inlet  34  is in contact with a cool air discharge outlet provided in the cabinet, the cool air supplied from the cabinet may be supplied to the inlet  34 . 
     The cool air supplied through the inlet  34  may be supplied to the ice maker  100  and cool the water received in the ice tray  110  after passing through a cool air supply duct provided in the refrigerator compartment door  32 . 
     Meanwhile, the cool air discharged from the ice maker  100  is guided to a discharge outlet  36  after passing through the ice bank  42  and then passing through a cool air discharge duct provided in the refrigerating compartment door  32 . Since the air discharged from the discharge outlet  36  is in contact with a cool air collecting hole provided in the cabinet, the air may again be guided to the evaporator provided in the cabinet. 
     Although the ice making compartment  40  needs a temperature below zero to form ice, since the refrigerating compartment door  32  opens or closes the refrigerating compartment which maintains a temperature above zero, it is preferable that the air supplied to the ice making compartment  40  or discharged from the ice making compartment  40  is not discharged to the refrigerating compartment. 
     Therefore, in one embodiment, a path that may move through the inlet  34  and the discharge outlet  36  is formed such that the cool air supplied to the refrigerating compartment door  32  and the cool air discharged from the refrigerating compartment door  32  may not leak to the storage compartment. 
     Meanwhile, the cool air supplied to the refrigerating compartment door  32  through the inlet  34  is guided to the upper side of the refrigerating compartment door  32 . On the other hand, the cool air which has passed through the ice maker  100  is guided from the inside of the refrigerating compartment door  32  to the lower side of the refrigerating compartment door  32 , whereby the cool air may be discharged through the discharge outlet  36 . 
     As shown in  FIG.  15   , a cool air guide  600  for supplying the cool air to the lower portion of the ice maker  100  is provided at the lower portion of the ice maker  100 . An inlet  602  to which the cool air from the cool air supply duct provided inside the refrigerating compartment door  32  is transferred is provided at one side of the cool air guide  600 . 
     The cool air guide  600  is provided with a body  604  for guiding a path of the cool air, and the inlet  602  is arranged at the right side (based on  FIG.  15   ) of the body  604  and thus the cool air is guided from the body  604  in a left direction. 
     The body  604  includes a bottom surface  608 , of which upper side is provided with an opening portion  606 , whereby the cool air may upwardly be discharged toward the opening  606  without moving to the lower portion of the body  604 . 
     The bottom surface  608  is extended to be shorter than the width of the ice maker  100 . The cool air guided through the cool air guide  600  moves to the portion where the bottom surface  608  is formed, relatively stably in a left direction. However, if the cool air gets out of the portion where the bottom surface  608  is formed, the cool air moves relatively freely. Therefore, the cool air moves at a portion where the cool air gets out of the bottom surface  608 , in various directions, whereby the cool air may get out of resistance from the bottom surface  608 . 
       FIG.  16    is a view illustrating that an ice tray is viewed from the front,  FIG.  17    is a view illustrating that a lower portion of an ice tray is viewed, and  FIG.  18    is a view illustrating that an ice tray is viewed from a lower side. 
     In  FIGS.  16  and  17   , arrows represent a brief moving direction of the cool air supplied form the cool air guide  600 . 
     When the ice tray  110  is heated for ice separation, pins of the ice tray  110  are excessively increased, an electric heating area is increased, and a heating time is increased due to increase of heat capacity of the ice tray  110 . This may cause reduction of ice making amount, increase of ice making power consumption, and quality deterioration of ices due to melting of ice caused by heating of the heater. That is, since a heat transfer coefficient ‘ha’ for increase of ice making heat transfer amount is increased if a pressure drop amount on a cool air path is small, reckless pin attachment of the ice tray  110  may cause reduction of ice making air volume. 
     In this embodiment, a method for discharging the cool air to a front surface of the ice tray  110  by allowing the cool air to enter a right side of the ice maker  100  and performing heat transfer from lower and front surfaces of the ice tray  110  is adopted. To increase ice making performance (ice making heat transfer amount) in the ice maker, pins are arranged for an electric heating area of the ice tray  110  and the cool air. However, if the pins are excessively arranged for increase of the electric heating area, a heating time for ice separation is increased due to increase of heat capacity according to increase of a total mass of the ice tray  110 , whereby ice making heat transfer efficiency is reduced. Also, a pressure drop amount of an ice making path is increased in accordance with arrangement of the pins, whereby heat transfer efficiency may be reduced. Therefore, in this embodiment, the technology of lower and front surfaces of the ice tray has been devised considering the aforementioned technical restrictions. 
     Meanwhile, in this embodiment, the cool air for ice making enters the ice tray  110  from the left side, cools the lower end of the ice tray  110  and then is discharged to the front surface of the ice tray  110 . At this time, since the driving device  150  for rotation of the ejector  120  exists at the left side of the ice tray, the path is blocked, whereby vortex occurs at the lower end of the ice tray  110 . Therefore, to minimize the vortex, the pins are removed from a certain area of the front surface, whereby efficiency in trade-off between the electric heating area and pressure drop is increased. 
     In case of the lower end of the ice tray  110 , a lot of heat transfer of the cool air occurs at the right side of the ice tray  110 , the right side of the ice tray  110  has the lowest temperature, whereas heat transfer is reduced at the left side of the ice tray  110  due to flow speed reduction and air temperature increase. Therefore, it is effective to arrange lower pins of the ice tray  110  at only a certain area. Also, staggered arrangement not in-line arrangement is applied to arrangement of the pins. 
     A first guide rib  192 , for heat exchange with the cool air supplied from the cool air guide  600 , a second guide rib  194  and a third guide rib  196  are arranged at the lower portion of the ice tray  110 . 
     The first guide rib  192  is arranged to be extended in a forward and backward direction with respect to the ice tray  110  and thus arranged to be vertical to the cool air supplied from the cool air guide  600  in a left direction. Also, the first guide rib  192  is downwardly protruded with respect to the ice tray  110 , whereby a contact area of the ice tray  110  with the cool air may be increased through the first guide rib  192  to quickly generate ices. 
     The second guide rib  194  is arranged to be extended in a left and right direction with respect to the ice tray  110  and thus arranged to be parallel with the cool air supplied from the cool air guide  600  in a left and right direction. Also, the second guide rib  194  is downwardly protruded with respect to the ice tray  110 , whereby the contact area of the ice tray  110  with the cool air may be increased through the second guide rib  194  to quickly generate ices. 
     Also, the second guide rib  194  may be arranged at the center of the lower portion of the ice tray  110  to guide a moving direction of the cool air supplied from the cool air guide  600 . 
     Meanwhile, the lower portion of the ice tray  110  may be categorized into a first area a 1  arranged to adjoin the cool air guide  600  and a second area a 2  arranged to be far away from the cool air guide  600 . 
     Since the first area a 1  is arranged to be close to the cool air guide  600 , the first area a 1  is a portion where a relatively fast speed of the cool air supplied from the cool air guide  600  is maintained. On the other hand, since the second area a 2  is arranged to be far away from the cool air guide  600 , the second area a 2  is a portion where the speed of the cool air supplied from the cool air guide  600  relatively becomes slow. If there are a lot of projected portions in the ice tray  110 , since the contact area of the ice tray  110  with the cool air is increased, it is advantageous in that heat exchange efficiency is increased, whereas a drawback occurs in that friction with the air is increased to make the moving speed of the air slow. 
     Therefore, in the area of a 1 , the second guide rib  194  is not provided, and the cool air is maintained at a relatively fast speed to easily move the cool air to the area of a 2 . On the other hand, since the speed of the cool air is lowered in the area of a 2 , the second guide rib  194  is provided to have more contact areas. 
     Meanwhile, the second guide rib  194  is arranged to be parallel with a left direction, to which the cool air moves, such that the moving speed of the cool air does not become slow if possible. 
     The third guide rib  196  is arranged to be extended in a left and right direction with respect to the ice tray  110  and arranged at lower corners of the ice tray  110 . The third guide rib  196  may form a lower outside of the ice tray  110 . 
     At this time, a barrier  198  is provided at the rear of the ice tray  110 . The barrier  198  may be arranged to be spaced apart from the third guide rib  196 . 
     The heater  140  may be arranged between the barrier  198  and the third guide rib  196 . 
     The third guide rib  196  guides the cool air to stay in the lower portion of the ice tray  110 , whereby a heat exchange time of the cool air with the ice tray  110  may be increased. 
     The third guide rib  196  may be arranged at both ends of the first guide rib  192 . That is, the third guide rib  196  may be arranged at a portion where the first guide rib  192  ends. 
     Each of the first guide rib  192  and the third guide rib  196  may be arranged as a plurality of the same. The third guide ribs  196  may be arranged to connect the first guide ribs  192  in a line. Therefore, the time when the cool air stays in the lower portion of the ice tray  110  is increased, whereby ice making efficiency may be improved. 
     The respective third guide ribs  196  may be arranged to be spaced apart from each other in a left and right direction. Since the portion where the heater  140  is arranged may partially be exposed between the third guide ribs  196 , the heater  140  may be cooled together with the third guide ribs  196 . 
     The plurality of first guide ribs  192  may be arranged, and the respective first guide ribs  192  may be arranged at the same interval. At this time, the second guide rib  194  may be arranged to connect two of the first guide ribs  192  to guide a flow of the cool air. 
     Particularly, the second guide rib  194  may be formed to be more protruded downwardly than the first guide rib  192 , and thus may guide the cool air in a certain direction while increasing the contact area with the cool air. 
     The second guide rib  194  may be arranged as a plurality of the same, and the respective second guide ribs  194  may be arranged alternately. Since the second guide ribs  194  are formed to be more protruded downwardly than the first guide rib  192 , it may be difficult for the cool air to move in a forward and backward direction between the second guide ribs  194 . Therefore, to enhance freedom of degree in the moving direction of the cool air, the second guide ribs  194  are arranged in staggered arrangement not in-line arrangement. 
     Fourth guide ribs  190  are provided on a front surface (see  FIG.  16   ) of the ice tray  110  and protruded to be extended in an up and down direction. The fourth guide ribs  190  are arranged in a third area b 1  arranged to adjoin the cool air guide  600  in the ice tray  110 . 
     On the other hand, on the front surface of the ice tray  110 , a fourth area b 2  arranged to be far away from the cool air guide  600  may have a flat shape. That is, since the fourth guide ribs  190  are not arranged in the fourth area b 2 , the fourth area b 2  may constitute one surface. 
     The moving speed of the cool air is relatively fast in the third area b 1  adjacent to the cool air guide  600  on the front surface of the ice tray  110 , whereas the moving speed of the cool air becomes slow in the fourth area b 2  far away from the cool air guide  600 . 
     Therefore, the fourth guide ribs  190  are provided in the third area b 1  to increase a heat exchange area with the cool air. On the other hand, the fourth area b 2  may be formed as a flat surface, whereby the cool air may pass through the fourth area b 2  without any delay. 
     Meanwhile, since some of the fourth guide ribs  190  are extended at different lengths to guide the cool air in various directions not a uniform direction. 
     The portion where the first area a 1  and the second area a 2  are divided from each other may be the same as or different from the portion where the third area b 1  and the fourth area b 2  are divided from each other. 
     The cool air guide  600  is arranged below the ice tray  110 , and the air guide  166  is arranged on the front surface of the ice tray  110  (see  FIGS.  2  and  3   ). Although the air guide  166  is provided with the cool air discharge holes  169 , the space between the ice tray  110  and the air guide  166  is smaller than the lower space of the ice tray  110 . Therefore, based on that it is more difficult for the cool air to move on the front surface of the ice tray  110  than the lower portion of the ice tray  110 , less guide ribs are arranged on the front surface than the lower portion to improve heat exchange efficiency between the cool air and the ice tray. 
       FIG.  19    is a control block diagram illustrating one embodiment. Description will be given with reference to  FIG.  19   . 
     In the present disclosure, a controller  500  receives information from various elements and transfers a related command in accordance with the received information. The controller  500  may be provided in the circuit board  1580  of the ice maker  110 . 
     Unlike the above case, to concisely maintain the circuit board  1580 , the controller may mean a controller for controlling the refrigerator. In this case, the controller  500  may together perform a function of driving a compressor for compressing a refrigerant, a function of transferring a related signal to a display provided in a door, and a function of transmitting and receiving a signal between an external communication network and the refrigerator. 
     Description will be given based on that the present disclosure is applicable to both the aforementioned two examples (the example that the controller is provided in the circuit board and the example that the controller corresponds to a main controller of the refrigerator). 
     The controller  500  receives information on a temperature from the temperature sensor unit  180 . The controller  500  may determine whether the ice tray  110  has been sufficiently cooled, and may determine whether ice has been formed in the ice tray  110  in accordance with the sensed temperature. 
     The first sensor unit  300  may sense movement of the first rotation member in accordance with rotation of the ejector rotation gear. To this end, the first sensor unit  300  may include a first hall sensor  1536  as shown in  FIGS.  7 A to  7 C . The first hall sensor  1536  may sense a change of a magnetic force if the first rotation member moves, and therefore may sense rotation of the ejector. Therefore, the controller  600  may sense a rotation angle of the ejector  120  by means of the first sensor unit  300 . 
     The second sensor unit  310  may sense movement of the second rotation member in accordance with rotation of the ejector rotation gear. To this end, the second sensor unit  310  may include a second hall sensor  1566  as shown in  FIGS.  8 A and  8 B . The second hall sensor  1566  may sense a change of a magnetic force if the full-ice sensing bar rotation gear  1560  moves together with the second rotation member, and therefore may sense rotation of the full-ice sensing bar rotation gear  1560 . Therefore, the controller  600  may sense whether ices are stacked at a set amount or more, by means of the second sensor unit  310 . 
     A flow rate sensor  610  may sense the amount of water supplied to the ice tray  110 . Therefore, the controller  500  may sense the amount of water supplied to the ice tray  110  in accordance with a signal received from the flow rate sensor  610 . 
     The controller  500  may command the motor  1510  to perform a forward rotation or backward rotation. That is, the motor  1510  may rotate the ejector rotation gear clockwise or counterclockwise in accordance with the signal of the controller  500 . 
     The controller  500  may turn on or off the heater  140 . The controller  500  may heat the ice tray  110  by turning on the heater  140  in accordance with the rotation angle of the ejector. Also, the controller  500  may stop supply of heat to the ice tray  110  by turning off the heater  140  in accordance with the rotation angle of the ejector. 
     The controller  500  may open or close the water supply valve  600  for opening or closing the path where water is supplied to the ice tray  110  in accordance with flow rate information received from the flow rate sensor  610 . If the water supply valve  600  opens the path, water may be supplied to the ice tray  110 , and if the water supply valve closes the path, water is not supplied to the ice tray  110 . 
       FIGS.  20 A and  20 B  are views illustrating an embodiment of a rotation path of an ejector, and  FIGS.  21 A and  21 B  are views illustrating an embodiment of an ejector rotation gear. 
       FIG.  20 A  illustrates that an embodiment described with reference to  FIGS.  4  to  8 B  is implemented, and  FIG.  20 B  illustrates a method implemented in accordance with another embodiment. Likewise, rotation according to  FIG.  20 A  may be implemented by an operation of the ejector rotation gear shown in  FIG.  21 A , and rotation according to  FIG.  20 B  maybe implemented by the ejector rotation gear shown in  FIG.  21 B . 
     The embodiment according to  FIGS.  20 A and  21 A  will be described. If ice making is completed in the ice tray  110 , the ejector  120  is rotated from the first position to the second position counterclockwise to identify full-ice of the ice bank  42 . At this time, although the protrusion pin  124  is rotated together with the ejector  120 , the full-ice sensing bar rotation gear  1560  is substantially rotated to sense full-ice. 
     In this case, as the ejector rotation gear  1520  shown in  FIG.  21 A  is rotated clockwise, and the first rotation member  1530  is hung in the second groove  1524 . Therefore, the first sensor unit  300  may sense movement of the first rotation member  1530 , and may finally sense that the protrusion pin  124  moves to the second position. 
     Subsequently, the controller  500  provides a rotation force of the motor  1510  rotated counterclockwise, whereby the ejector  120  is rotated counterclockwise. That is, the protrusion pin  124  moves from the second position to the first position. Likewise, since the first rotation member  1530  is hung in the first groove  1523 , the first sensor unit  300  may sense movement of the first rotation member  1530 , and may finally sense that the protrusion pin  124  moves to the first position. The first position may mean the initial position. 
     At the first position, if a certain time passes after the heater  140  is turned on, the protrusion pin  124  moves to the third position counterclockwise due to the rotation force of the motor  1510 . The protrusion pin  124  continues to push the ice until the surface of the ice is melted and then the ice moves. If the surface of the ice is melted and the ice moves after a certain time passes, the protrusion pin  124  moves by continuously pushing the ice. Even at this time, the heater  140  is continuously driven, and heats the ice tray  110 . If the heater  140  is driven, since a current is supplied to the heater  140 , the heater  140  consumes energy. 
     If the protrusion pin  124  pushes the ice while being rotated counterclockwise and finally reach the second position, the heater  140  is turned off. That is, no current is supplied to the heater  140 , and energy consumption is stopped. 
     Subsequently, if the protrusion pin  124  reaches the first position while being rotated counterclockwise, it is determined that ice separation of the ice tray  110  is completed. 
     Unlike the embodiment according to  FIGS.  20 A and  21 A , the first cam portion  1522  of the ejector rotation gear is additionally provided with a third groove  1525  in the embodiment according to  FIGS.  20 B and  21 B . That is, the first cam portion  1522  are provided with the first groove  1523 , the second groove  1524  and the third groove  1525 . 
     If the first rotation member  1530  is hung in each of the first, second and third grooves  1523 ,  1524  and  1525 , the first sensor unit  300  senses a position change of the first rotation member  1530 . Therefore, the first sensor unit  300  may sense how the ejector  120 , that is, the protrusion pin  124  is rotated to reach the current position and an angle at the current position. 
     In this embodiment, the ejector rotation gear  1520  is rotated from the first position to the second position in the same manner as the embodiment of  FIGS.  20 A and  21 A  to sense full-ice. Therefore, the protrusion pin is rotated from the first position to the second position clockwise. 
     If the ices are stacked in the ice bank  42  at a height lower than the set height, the ejector  120  is rotated counterclockwise. The protrusion pin  124  moves from the second position to the first position, and continue to be rotated counterclockwise and then move to the third position. 
     At this time, the first sensor unit  300  senses the time when the first rotation member  1530  is hung in the first groove  1523  (when the first rotation member  1530  reaches the first position), whereby the heater  140  is turned on at the corresponding time. 
     If the protrusion pin  124  is rotated counterclockwise to reach the third position and continuously push the ice, the ice starts to move by means of the protrusion pin  124 . 
     Meanwhile, if the protrusion pin  124  continues to be rotated counterclockwise, the ice move and the protrusion pin  124  reaches the fourth position. If the ice moves to the fourth position, the ice is substantially separated from the ice tray  110 , whereby the ice may move by means of only the rotation force of the protrusion pin  124  even though heat is not supplied from the heater  140 . 
     The time when the protrusion pin  124  reaches the fourth position is the same as the time when the first rotation member  1530  is hung in the third groove  1525 . That is, if the ejector rotation gear  1520  continues to be rotated counterclockwise, the ejector, that is, the protrusion pin  124  is rotated counterclockwise together with the ejector rotation gear  1520 . If the first rotation member  1530  is hung in the third groove  1525 , the first rotation member  1530  moves, and the first sensor unit  300  may sense the corresponding time. 
     The controller  500  may determine that the heater  140  does not need to supply heat because the protrusion pin  124  sufficiently pushes the ice at the corresponding time, and may turn off the heater  140 , whereby energy may be saved. 
     In the embodiment of  FIGS.  20 B and  21 B , the heater  140  is turned off at an earlier time as compared with the embodiment of  FIGS.  20 A and  21 A . That is, power consumption in the heater  140  may be reduced. If the power consumed by the heater  140  is increased, since the ice tray  110  is also heated by a high temperature, more energy is consumed to again cool the ice tray  110  to form the ice. 
     In the embodiment of  FIGS.  20 B and  21 B , energy consumed by the heater and energy consumed to cool the ice tray may be reduced as compared with the embodiment of  FIGS.  20 A and  21 A . Also, in the embodiment of  FIGS.  20 B and  21 B , since the temperature of the ice tray is not increased as compared with the embodiment of  FIGS.  20 A and  21 A , the ice tray may be cooled more quickly. Therefore, since the time required to form the ice may be reduced, the amount of the ice that may be provided to the user may be increased. 
     A structure that the position (the position of the protrusion pin  124  between 0° and 90°) where the ejector starts to move from the third position may be sensed is applied to the embodiment of  FIGS.  20 A and  21 B , and the heater  140  may be turned off relatively quickly. 
     Generally, for ice separation from the ice tray  110 , the heater  140  at the lower end of the ice tray  110  is used. If the protrusion pin  124  starts to move the ice beyond the third position, since the surface of the ice is melted even though the heater  140  is turned off, ice separation may be performed. 
       FIG.  22    is a view illustrating another embodiment of an ejector rotation gear. 
     Referring to  FIG.  22   , the ejector rotation gear  1520  includes the first groove  1523 , the third groove  1524  and a protrusion  1600  on the outer circumference of the first cam portion  1522 . 
     The initial position of the ejector is sensed by movement of the first rotation member  1530 , which is generated in the first groove  1523 , and a full-ice position is sensed by movement of the first rotation member  1530 , which is generated in the second groove  1524 . 
     On the other hand, the time when the heater  140  is turned off is sensed by movement of the first rotation member  1530 , which is generated in the protrusion  1600 . 
     If the first rotation member  1530  is hung in the first groove  1523  and the second groove  1524 , a position change of the first rotation member  1530  is sensed by the first hall sensor  1536  of the first sensor unit  1586 . 
     The first sensor unit  300  further includes a third hall sensor  1586  packaged in the circuit board  1580 . The third hall sensor  1586  is arranged above the first hall sensor  1536 . 
     If the first rotation member  1530  is hung in the protrusion  1600 , since the first rotation member ascends, the third hall sensor  1586  may sense movement of the first rotation member  1530 . 
     That is, in this embodiment, it is designed such that the protrusion  1600  is added to allow the first rotation member  1530  to ascend. The first sensor unit  300  may sense whether the ejector has reached the initial position, by means of the first hall sensor  1536 , and may sense whether the ejector has reached the position where the heater may be turned off, by means of the third hall sensor  1586 . 
     In this embodiment, since the first sensor unit includes two hall sensors, a first group of the initial position and the full-ice position may be identified from a second group of a position where the heater may be turned off. 
     In addition, in another embodiment, the off-time of the heater  140  may be determined by measurement of the current supplied to the motor  1510 . Since the ice does not move initially at the third position corresponding to the time when the protrusion pin  124  is rotated to reach the ice, stall occurs, and a current value supplied to the motor  1510  is increased. If the ice starts to move, stall is released and the protrusion pin  124  is rotated, and a current value consumed by the motor  1510  is reduced. The time when the current consumed by the motor  1510  is determined, and it is determined at that time that ice separation may be performed even though heat is not additionally supplied from the heater, whereby the heater may be turned off. 
     That is, the first sensor unit  300  may sense the angle of the protrusion pin  124  before the ice formed in the ice tray  110  is completely discharged from the ice tray  110 . The first sensor unit  300  may sense whether the ice passes through a specific position of a rotation track of the protrusion pin  124  even before the ice is completely discharged, by sensing whether the protrusion pin  124  have reached a specific angle. Meanwhile, the heater  140  may be turned off at the angle sensed by the first sensor unit  300 . That is, since the heater  140  may be turned off before the ice is completely discharge from the ice tray  110 , energy consumed for driving the ice maker may be saved. 
     Meanwhile, the first sensor unit  300  may sense whether the protrusion pin  124  has reached an angle before the ice ascends to the discharge guide  126 , and may turn off the heater  140  at the corresponding angle. After the ice ascends to the discharge guide  126 , the ice may be dropped along a slope of the discharge guide  126  and stored in the ice bank  42 . 
     Also, the first sensor unit  300  may sense whether the protrusion pin  124  has reached an angle which has rotated the ice formed by the ice tray at 90° or less, thereby turning off the heater  140  at the corresponding angle. Since the ice moves from the ice tray in a state that the ice is rotated at 90° or less, the ice may move without melting by additionally supplying heat from the heater  140 . 
     The first sensor unit  300  may sense whether the protrusion pin  124  has reached an angle before the protrusion pin  124  is arranged to be vertical to the ground after being in contact with the ice formed by the ice tray, and thus may turn off the heater  140  if the protrusion pin  124  reaches the corresponding angle. Since the time when the heater is turned off may become faster, energy consumed by the ice maker may be saved, and the time required to cool the ice maker may be saved. 
     Also, the first sensor unit  300  may sense whether the protrusion pin  124  has reached an angle for moving the ice formed by the ice tray  110  at a certain angle, and thus may turn off the heater  140  at the corresponding angle. 
     The first sensor unit  300  may sense whether the protrusion pin  124  has moved the ice formed by the ice tray at a predetermined angle after the heater  140  has been driven, and thus may turn off the heater  140 . 
     The first sensor unit  300  may sense a first position, a second position and a third position according to the rotation angle of the protrusion pin  124 , wherein the angle of the protrusion pin rotated at the first position, the second position and the third position are different from one another. In this case, if the protrusion pin  124  reaches the third position, the heater  140  may be turned off. 
     Meanwhile, the first position may be the initial position where ice separation starts, the second position may be the position where full-ice of the ice bank is sensed, and the third position may be the position where the ice formed by the ice tray moves at a predetermined distance. 
     If the first sensor unit  300  senses that the protrusion pin  124  has reached the first position, the heater  140  is turned on, whereby ice separation may start. 
       FIGS.  23 A and  23 B  are views illustrating an effect of the embodiments described in  FIGS.  20 A to  21 B . 
     The experimental result according to the embodiment of  FIGS.  20 A and  21 A  is shown in  FIG.  23 A , and the experimental result according to the embodiment of  FIGS.  20 B and  21 B  is shown in  FIG.  23 B . 
     In  FIGS.  23 A and  23 B , a bar graph means a heating time of the heater, and a line means ice making amount. 
     According to the experimental result of the embodiment according to  FIGS.  20 B and  21 B , additional heating of about  30  seconds may be avoided by the heater  140  as compared with the embodiment according to  FIGS.  20 A and  20 B . Therefore, it is noted that the heating time by the heater is reduced to 170 s. 
     As the time required for ice making is reduced, it is noted that the ice making amount is increased from 4.341b to 4.571b as much as 0.231b. 
     Referring to  FIG.  24   , the controller  500  may acquire temperature information of the ice maker or the ice tray from the temperature sensor unit  180 . The temperature sensor unit  180  includes a temperature sensor  182  that may be attached to the ice tray. 
     The freezing compartment  20  may be provided with a freezing compartment temperature sensor  2210  for sensing a temperature of a freezing compartment, and the refrigerating compartment  30  may be provided with a refrigerating compartment temperature sensor  2110  for sensing a temperature of a refrigerating compartment. The freezing compartment  20  and the refrigerating compartment  30  may transfer their respective temperature information to the controller  500 , and the controller  500  may transfer a command to various elements in accordance with the temperature information. 
     Also, a timer  2510  may be provided to measure elapsed time. The time measured by the timer  2510  is transferred to the controller  500 . 
     The door for opening or closing storage compartments is provided with a door switching sensor  2600 , whereby information on door&#39;s opening or closing is also transferred to the controller  500 . The door switching sensor  2600  may be provided in each of the freezing compartment door  22  and the refrigerating compartment door  32 , whereby the information on door&#39;s opening or closing may be acquired. Particularly, the door switching sensor  2600  may be installed in a hinge of the refrigerating compartment door  32  provided with the ice maker. Various examples of the door switching sensor  2600  may include a hall sensor, a reed switch, and a mechanical switch. 
     The controller  500  may allow the heater  140  to be turned on or off. If the heater  140  is driven, heat is generated and then supplied to the ice tray. 
     The controller  500  includes a refrigerating compartment fan  2100  for supplying the air cooled by heat exchange with the evaporator to the refrigerating compartment, a freezing compartment fan  2200  for supplying the air cooled by heat exchange with the evaporator to the freezing compartment, and an ice making compartment fan  2300  for supplying the air cooled by heat exchange with the evaporator to the ice making compartment. Since each fan may be driven individually, if each fan is driven, the cool air may be supplied to each corresponding area. The controller  500  may control each fan to be driven or stopped driving. 
     The controller  500  may command whether to drive the compressor  2400  which is a partial element of the cooling cycle. If the compressor  2400  is driven, the compressor  2400  may compress a refrigerant and circulate the compressed refrigerant through a cooling cycle. On the other hand, if the compressor  2400  is not driven, the compressor  2400  does not compress the refrigerant, whereby circulation of the refrigerant may be stopped in the cooling cycle. 
     Also, the controller  500  may control a valve  2500  provided in the cooling cycle, forming a moving path of the refrigerant. 
     The cooling cycle will be described with reference to  FIG.  25   . 
     The refrigerant compressed by the compressor  2400  is guided to the condenser  2420 . The compressed refrigerant is cooled while passing through the condenser  2420 , and is guided to the valve  2500 . 
     The valve  2500  may include a three-way valve to guide the refrigerant to any one of two paths. 
     The valve  2500  may guide the refrigerant, which has passed through the condenser  2420 , to a first path  2501  and a second path  2502 . 
     The first path  2501  may be provided with a first capillary portion  2440 , of which rear end may be provided with a first evaporator  2442 . At this time, the first evaporator  2442  may be a refrigerating compartment evaporator for supplying the cool air to the refrigerating compartment. Also, the first evaporator  2442  may be provided with the refrigerating compartment fan  2100  that may supply the air heat-exchanged by the first evaporator  2442  to the refrigerating compartment. The refrigerating compartment fan  2100  may mean a first fan. 
     The refrigerant evaporated by passing through the first evaporator  2442  may be guided to the compressor  2400 . In this way, the refrigerant may be circulated. 
     The second path  2502  may be provided with a second capillary portion  2450 , of which rear end may be provided with a second evaporator  2452 . At this time, the second evaporator  2452  may be a freezing compartment evaporator for supplying the cool air to the freezing compartment. The freezing compartment evaporator may also supply the cool air to the ice making compartment. Since it is preferable that each of the ice making compartment and the freezing compartment maintains a temperature below zero to make ices, the cool air supplied to the ice making compartment and the cool air supplied to the freezing compartment may have the same temperature. 
     Also, the second evaporator  2452  may be provided with the ice making compartment fan  2300  that may supply the air heat-exchanged by the second evaporator  2452  to the ice making compartment. The ice making compartment fan  2300  may mean a third fan. 
     If the freezing compartment fan  2200  is driven while the refrigerant is being evaporated by the second evaporator  2452 , the cool air may be supplied to the freezing compartment, whereby the temperature of the freezing compartment descends. On the other hand, if the ice making compartment fan  2300  is driven while the refrigerant is being evaporated by the second evaporator  2452 , the cool air may be supplied to the ice making compartment, whereby the temperature of the ice making compartment descends. 
     The refrigerant evaporated by passing through the second evaporator  2452  may be guided to the compressor  2400 . In this way, the refrigerant may be circulated. 
     That is, the refrigerant is circulated in such a manner that the refrigerant which has compressed by the compressor  2400  is guided to either the first path  2501  or the second path  2502  while passing through the valve  2500  and again enters the compressor  2400 . 
     Referring to  FIGS.  25  to  27   , the refrigerator according to one embodiment may include a compressor  2400  for compressing a refrigerant, first and second evaporators  2442  and  2452  to which the refrigerant compressed by the compressor  2400  is supplied, and a valve  2500  for forming a path that moves the refrigerant supplied from the compressor  2400  to either the first evaporator  2442  or the second evaporator  242 . In the refrigerator according to one embodiment, one compressor  2400  and two evaporators  2442  and  2452  are provided, and the refrigerant compressed by the compressor  2400  may be moved to any one of the two evaporators  2442  and  2452 , evaporated in each evaporator and heat-exchanged with the external air, and may cool the external air. Hereinafter, for convenience of description, the first fan  2100  will be referred to as a refrigerating compartment fan, the second fan  2200  will be referred to as a freezing compartment fan, and the third fan  2300  will be referred to as an ice making compartment fan. 
     The first evaporator  2442  may supply the cool air to the refrigerating compartment, and the second evaporator  2452  may supply the cool air to the freezing compartment or the ice making compartment, or may supply the cool air to both the freezing compartment and the ice making compartment. The first evaporator  2442  may be provided with a refrigerating compartment fan  2100  for generating a fluid for supplying the cool air to the refrigerating compartment. The second evaporator  2452  may be provided with a freezing compartment fan  2200  for generating a fluid for supplying the cool air to the freezing compartment and an ice making compartment fan  2300  for generating a fluid for supplying the cool air to the ice making compartment. 
     First of all, for cooling of the refrigerating compartment, the freezing compartment and the ice making compartment, one embodiment includes a first step of sensing whether to satisfy a temperature condition of the refrigerating compartment, a second step of sensing whether to satisfy a temperature condition of the freezing compartment if the first step is satisfied, and a third step of sensing whether to satisfy a temperature condition of the ice making compartment or whether the time required for ice making has passed if the second step is satisfied. 
     At this time, the compressor may be driven without stop while the second step and the third step are being performed, and driving of the compressor  2400  may be stopped if the third step is satisfied. That is, if the condition for the refrigerating compartment, the freezing compartment and the ice making compartment is satisfied, the compressor  2400  determines that the cool air is not required to be supplied any more, whereby the compressor  2400  may not compress the refrigerant, and may allow the refrigerant not to be circulated in the cooling cycle. 
     First of all, it is determined whether the temperature condition of the refrigerating compartment is satisfied (S 10 ). At this time, the temperature condition of the refrigerating compartment may mean a refrigerating compartment temperature set by a user. Also, the temperature of the refrigerating compartment corresponds to a temperature lower than the refrigerating compartment temperature set by the user as much as a predetermined temperature, and may mean a temperature that may be maintained at the temperature set by the user after a certain time period passes. 
     If the temperature condition of the refrigerating compartment is not satisfied, the compressor  2400  is driven to compress the refrigerant. Also, the first path  2501  is opened by the valve  2500 , whereby the refrigerant, which has been compressed by the compressor  2400  and has passed through the condenser  2420 , is guided to the first path  2501 . The refrigerant guided to the first path  2440  may be expanded while passing through the first capillary portion  2440  and heat-exchanged by the first evaporator  2442 , whereby the air adjacent to the first evaporator  2442  may be cooled. As the refrigerating compartment fan  2100  is driven, the cool air cooled by the first evaporator  2442  is supplied to the refrigerating compartment, whereby the temperature of the refrigerating compartment may descend (S 12 ). 
     Meanwhile, if the first path  2501  is opened by the valve  2500 , the second path  2502  may be blocked. That is, the valve  2500  may open any one of the first path  2501  and the second path  2502  and block the other path. 
     If the temperature of the refrigerating compartment descends to satisfy the temperature condition of the refrigerating compartment, the valve  2500  blocks the first path  2501  and stops driving of the refrigerating compartment fan  2100  (S 14 ). At this time, since the temperature condition of the refrigerating compartment has been satisfied, driving of the compressor  2400  may be stopped. On the other hand, without stopping driving of the compressor  2400 , the compressor  2400  may be driven to reduce its load by lowering RPM. 
     Subsequently, it is determined whether the temperature condition of the freezing compartment is satisfied (S 20 ). At this time, the temperature condition of the freezing compartment may mean a freezing compartment temperature set by a user. Also, the temperature of the freezing compartment corresponds to a temperature lower than the freezing compartment temperature set by the user as much as a predetermined temperature, and may mean a temperature that may be maintained at the temperature set by the user after a certain time period passes. 
     If the temperature condition of the freezing compartment is not satisfied, the compressor  2400  is driven to compress the refrigerant. Also, the second path  2502  is opened by the valve  2500 , whereby the refrigerant, which has been compressed by the compressor  2400  and has passed through the condenser  2420 , is guided to the second path  2502 . The refrigerant guided to the second path  2502  may be expanded while passing through the second capillary portion  2450  and heat-exchanged by the second evaporator  2452 , whereby the air adjacent to the second evaporator  2452  may be cooled. As the freezing compartment fan  2200  is driven, the cool air cooled by the second evaporator  2452  is supplied to the freezing compartment, whereby the temperature of the freezing compartment may descend (S 20 ). 
     If the second path  2502  is opened and a predetermined time period passes after the freezing compartment fan  220  is driven (S 24 ), the ice making compartment fan  2300  is driven (S 26 ). A separate duct may be provided at a discharge end of the fan  2300  during ice making, whereby the fluid generated by the ice making compartment fan  2300  may be guided to the ice making compartment. 
     If the temperature condition of the freezing compartment is satisfied in S 20 , driving of the freezing compartment fan  2200  is stopped. That is, it is determined that the cool air is not required to be supplied to the freezing compartment due to sufficient cooling of the freezing compartment, whereby driving of the freezing compartment  2200  is stopped. 
     Also, the ice making compartment fan  2300  is driven, whereby the cool air is supplied to the ice making compartment (S 29 ). If the temperature condition of the freezing compartment is not satisfied in S 20 , the freezing compartment fan  2200  is driven, and the ice making compartment fan  2300  is driven if a predetermined time period passes, whereby the cool air starts to be supplied to the ice making compartment. In this case, since the time when the ice making compartment fan  2300  and the freezing compartment fan  2200  are driven together exists, the time when the cool air generated by the second evaporator  2442  is supplied to the freezing compartment and the ice making compartment exists. Since only the freezing compartment fan  2200  is driven initially, the cool air is initially supplied to the freezing compartment only. A detailed control flow related to this case is described in  FIG.  26   . 
     On the other hand, if the driving condition of the freezing compartment is satisfied in S 20 , driving of the freezing compartment fan  2200  does not start. That is, since driving of the freezing compartment fan  220  is stopped, the cool air is not supplied to the freezing compartment. The ice making compartment fan  2300  is driven to supply the cool air to the ice making compartment. In this case, since the time when the freezing compartment fan  2200  and the ice making compartment fan  2300  are driven together does not exist and the freezing compartment is at a sufficiently cooled state, the cool air generated by the second evaporator  2452  is supplied to the ice making compartment only. 
     Since the temperatures of the refrigerating compartment, the freezing compartment and the ice making compartment generally ascend if the time passes, when each temperature condition is determined, it is likely that most of the temperature conditions are not satisfied. Therefore, it is likely that most of the temperature conditions are managed by the control method according to  FIG.  26   . 
     It is determined whether the temperature condition of the ice making compartment is satisfied or the driving time for ice making passes (S 30 ). Even though any one of the two conditions is satisfied, it may be determined that the condition in S 30  is satisfied. 
     At this time, the temperature condition of the ice making compartment may mean the ice making compartment temperature set by the user. Also, the ice making compartment temperature may mean a temperature that is set by a worker who has manufactured a refrigerator to freeze water within a short time. 
     Meanwhile, the driving time for ice making is the driving time set by the worker, and may be set considering the amount of ices to be supplied per day. The driving time for ice making may mean the time when ices can be generated when the cool air is supplied. That is, in one embodiment, even though the temperature of the ice making compartment does not descend sufficiently to satisfy the temperature condition of the ice making compartment, if the driving time for ice making passes, the cool air is not supplied to the ice making compartment any more. 
     If the temperature condition of the ice making compartment is not satisfied or the driving time for ice making does not passes, the compressor  2400  is driven to compress the refrigerant. Also, the second path  2502  is opened by the valve  2500 , whereby the refrigerant compressed by the compressor  2400 , passing through the condenser  2420  is guided to the second path  2502 . The refrigerant guided to the second path  2502  may be expanded while passing through the second capillary portion  2450  and heat-exchanged by the second evaporator  2452 , whereby the air adjacent to the second evaporator  2452  may be cooled. As the ice making compartment fan  2300  is driven, the cool air cooled by the second evaporator  2452  is supplied to the ice making compartment, whereby the temperature of the ice making compartment may descend (S 32 ). Therefore, water received in the ice tray may be phase-changed to ice. 
     If the corresponding condition is satisfied in S 30 , the second path  2502  is blocked, whereby the refrigerant may not move to the second path  2502  any more. Also, driving of the ice making compartment fan  2300  is stopped, whereby the air cooled by the second evaporator  2452  is blocked from being guided to the ice making compartment (S 34 ). 
     Since the refrigerating compartment, the freezing compartment and the ice making compartment have been sufficiently cooled, driving of the compressor  2400  is stopped (S 40 ). 
     In one embodiment, even though the temperature condition of the freezing compartment is satisfied, driving of the compressor  2400  is not stopped, and the ice making compartment fan  2300  is driven. Therefore, as soon as the ice making compartment fan  2300  is driven, the air cooled by the second evaporator  2452  may be supplied to the ice making compartment, whereby the temperature of the ice making compartment may quickly descend, and the time required to generate ices may be reduced. 
     In  FIG.  28   , an experimental result (b) according to one embodiment and the existing an experimental result (a) according to the related art are compared with each other. 
     In the related art experimental result (a), if the freezing compartment temperature is satisfied, driving of the compressor  2400  is stopped. Also, before the temperature condition of the freezing compartment is satisfied, the ice making compartment fan  2300  is driven for a certain time period, and then if the temperature condition of the freezing compartment is satisfied, driving of the ice making compartment fan  2300  and driving of the freezing compartment fan  2200  are stopped together. 
     In the experimental result (b) of one embodiment, even though the freezing compartment temperature descends to a set temperature as described above, driving of the compressor  2400  is not stopped. Also, driving of the compressor  2400  is stopped only if the temperature condition of the ice making compartment is satisfied or the driving time for ice making is satisfied. Therefore, the driving time of the compressor  2400  may be more increased than the existing compressor, whereby the cool air may be more generated. 
     Also, since the time when the ice making compartment fan  2300  is driven while the freezing compartment fan  2200  is not driven exists, the cool air generated by the second evaporator  2452  is supplied to the ice making compartment only without being supplied to the freezing compartment. Therefore, since the cool air may be concentrated on the ice making compartment, the temperature of the ice making compartment rapidly descends, whereby ices may quickly be generated. 
     The time required for ice making is 47 minutes in the related art experimental result (a), whereas the time required for ice making is reduced to 38 minutes in the experimental result (b) of one embodiment, whereby it is noted that the time for ice making is reduced to 9 minutes. 
     Also, a daily amount for ice making is 4.5 lbs/day, approximately, in the related art experimental result (a), whereas a daily amount for ice making is 5.5 lbs/day in the experimental result (b) of one embodiment, whereby it is noted that the amount of ices that may be provided per day has been increased. 
     Since the time for concentrating the cool air on the ice making compartment exists in one embodiment, the time required to generate ices may be reduced, and more ices may be generated. Also, since the time required to supply the cool air to the ice making compartment may be increased, the time required to generate ices may be reduced, and more ices may be generated. 
     Another embodiment will be described with reference to  FIG.  29   . In another embodiment of  FIG.  29   , the ice making compartment fan is not driven for a certain period while ice separation is being made. If the ice making compartment fan is driven while heat is being generated by the heater, heat of the heater is dispersed and the temperature of the ice tray  110  fails to be increased sufficiently, whereby ices may not be separated from the ice tray  110 . 
     Also, as heat generated from the heater  140  is dispersed inside the ice making compartment by movement of the air generated by the ice making compartment fan, the temperature inside the ice making compartment ascends. After ice separation is completed, more cool air should be supplied when the ice making compartment is cooled to generate ices in the ice tray  110 , whereby a problem occurs in that energy efficiency is deteriorated. Therefore, in another embodiment, the heater is driven, and driving of the ice making compartment fan is stopped for a certain time when heat is supplied from the heater, whereby heat of the heater is supplied to the ice tray only without being forcibly dispersed to other areas. As a result, energy efficiency is improved. 
     In another embodiment, the refrigerator may include an ice tray  110  for receiving water to generate ices, a motor  1510  capable of being rotated in a forward or reverse direction, an ejector  120  including a rotary shaft  122  rotating ices made in the ice tray  110  to discharge the ices from the ice tray  110 , rotated by being axially connected to the motor  1510  and a protrusion pin  124  protruded in a radius direction of the rotary shaft  122  to adjoin the ices, and a heater  140  for selectively supplying heat to the ice tray  110 . 
     In another embodiment, the rotation path of the ejector and the rotation gear of the ejector, which are described with reference to  FIGS.  20 A to  21 B , are used. 
     First of all, the ejector  120  may be rotated to sense whether the ices separated from the ice tray  110  are received in the ice bank  42  at a set height. That is, the ejector  120  is rotated to sense whether the ice bank  42  is fully filled with ices (S 100 ). To sense whether the ice bank  42  is fully filled with ices, the motor  1510  may be rotated in a reverse direction so that the full-ice sensing bar  170  of the ejector  120  may be rotated. At this time, the protrusion pin  124  is rotated from a position  1  to a position  2  in  FIGS.  20 A and  20 B . 
     As the full-ice sensing bar  170  is rotated, a space where ices will be added exists in the ice tray  110 . That is, if it is sensed that the ice bank  42  is not fully filled with ices, the motor  1510  is rotated in a forward direction (direction opposite to full-ice), whereby the protrusion pin  124  may be rotated counterclockwise and moved from the position  2  to the position  1 . At this time, the position  1  may mean a first setup position. 
     It is determined whether the ejector  120  is rotated and reaches a first setup position (S 110 ). 
     As the ejector  120  is rotated, if the protrusion pin  1240  reaches the first setup position, the heater  140  is driven to supply heat to the ice tray  110 , whereby the ice tray  110  is heated. Therefore, a corresponding surface of ice adjacent to the ice tray  110  may be melted and changed to water, and if a certain amount of heat is additionally supplied, the ice may be separated from the ice tray  110 . 
     The operation of the ice making compartment fan  2300  is stopped. If the ice making compartment fan  2300  is being driven, driving of the ice making compartment fan  2300  is stopped. On the other hand, if the ice making compartment fan  2300  is not driven, the state that the ice making compartment fan  2300  is not driven is maintained (S 120 ). 
     As the ejector  120  may be rotated, whether the protrusion pin  124  reaches the first setup position may be determined through the ejector rotation gear  1520  shown in  FIGS.  21 A and  21 B . When a groove formed in the ejector rotation gear  1520  is engaged with a cam portion, it may be sensed that the protrusion pin  124  has reaches the first setup position. 
     Meanwhile, the heater  140  may be driven, and at the same time driving of the ice making compartment fan  2300  may be stopped. If the heater  140  starts to be driven, the heater  140  generates heat. Therefore, as the ice tray  110  is heated, the temperature of the ice making compartment may be increased. In this embodiment, since the ice making compartment fan  2300  is not driven while the heater  140  is being driven, heat generated from the heater  140  is not dispersed inside the ice making compartment by forced convection caused by the ice making compartment fan  2300 . Therefore, the temperature of the ice making compartment may be prevented from being rapidly increased. Also, the temperature of the refrigerating compartment may be prevented from being increased by increase of a peripheral temperature, or ices stored in the ice bank may be prevented from being melted by heat of the heater. 
     The state that the ejector  120  continues to be rotated is maintained. 
     As the ejector  120  is rotated, if the protrusion pin  124  reaches a second setup position (position  4 ) (S 130 ), driving of the heater  140  may be stopped. Since the protrusion pin  124  has separated ices from the ice tray  110 , it is determined that ices may be separated from the ice tray  110  even though heat is not supplied from the heater  140  additionally. Therefore, the heater  140  may be turned off, whereby energy consumed by the heater  140  may be reduced. Also, the temperature of the ice making compartment may be prevented from being additionally increased by heat of the heater  140 , whereby the amount of the cool air required for ice making may be reduced. 
     In a state that the heater  140  is turned off, the ice making compartment fan  2300  starts to be driven (S 140 ). If the ice making compartment fan  2300  is driven, movement of the air is generated, whereby the temperature of the ice tray  110 , which is relatively high inside the ice making compartment, may descend through heat exchange with another portion. 
     In this embodiment, since the ice making compartment fan  2300  is not driven while the heater  140  is being driven, the power consumed by the ice making compartment fan  2300  may be reduced. 
     In this embodiment, while ice separation is being made, the ice making compartment fan is not driven for the time when the heater is driven. That is, if the heater  140  is driven, the ice making compartment fan  2300  is not driven, and the heater  140  is not driven while the ice making compartment fan  2300  is being driven. 
     Meanwhile, after the ice making compartment fan  2300  is turned on, the ejector  120  continues to be rotated and the protrusion pin  124  is also rotated counterclockwise, whereby ices formed in the ice tray  110  may be discharged from the ice tray  110 . 
       FIG.  30    illustrates a modified example of  FIG.  29   . Unlike the embodiment of  FIG.  29   , the ice making compartment fan  2300  is driven for a part of a period where the heater  140  is driven in the embodiment of  FIG.  30   . 
     The same portion as that of  FIG.  29    will be described in brief, and the embodiment of  FIG.  30    will be described based on a difference from  FIG.  29   . 
     If ice separation starts, full-ice is sensed (S 100 ). 
     As the ejector  120  is rotated to determine whether the protrusion pin  124  has reached the first setup position (S 110 ). If the protrusion pin  124  reaches the first setup position, the heater  140  is turned on, and driving of the ice making compartment fan  2300  is stopped. 
     It is determined whether a predetermined time has passed after the heater  140  had turned on (S 122 ). At this time, the predetermined time may mean the time passed after driving of the ice making compartment fan  2300  had been stopped. 
     If the predetermined time passes, the ice making compartment fan  2300  is driven (S 124 ). That is, the ice making compartment fan  2300  starts to be driven in a state that the heater  140  is not turned off, whereby heat generated by the heater  140  may quickly be cooled. 
     At this time, the predetermined time may mean the time when the protrusion pin of the ejector  120  moves from the first setup position to the second setup position, and may be shorter than the time when the protrusion pin reaches the second setup position. Of course, the time when the protrusion pin reaches the second setup position may be equal to the predetermined time. 
     It is determined whether the ejector  120  has been rotated to reach the second setup position (S 130 ), and if the ejector  120  reaches the second setup position, the heater  140  is turned off (S 140 ). 
       FIG.  31    is a view illustrating an effect of the embodiments described in  FIGS.  29  and  30   , especially the effect of the embodiment according to  FIG.  30   . 
     In  FIG.  31   , X-axis means the time when driving of the ice making compartment fan is stopped. A solid line means the driving time of the heater, and a dotted line means a daily ice making amount which is the amount of ices generated per day. 
     As noted from  FIG.  31   , as the time when the ice making compartment fan  2300  is turned off becomes longer, the driving time of the heater becomes shorter, and a daily ice making amount is increased. That is, it is noted that, if the time when the ice making compartment fan  2300  is turned off reaches 90 seconds, the ice making amount is increased as much as 0.21b as compared with the other cases and the driving time of the heater may be reduced as much as 10 seconds. 
     Therefore, according to this embodiment, it is noted that the ice making amount may be more increased than that of the related art. 
     Still another embodiment will be described with reference to  FIG.  32   . 
     In still another embodiment, the refrigerator may include an ice tray  110  for receiving water to generate ices, a motor  1510  capable of being rotated in a forward or reverse direction, an ejector  120  including a rotary shaft  122  rotating ices made in the ice tray  110  to discharge the ices from the ice tray  110 , rotated by being axially connected to the motor  1510  and a protrusion pin  124  protruded in a radius direction of the rotary shaft  122  to adjoin the ices, a heater  140  for selectively supplying heat to the ice tray  110 , and a door switching sensor  2600  for sensing a storage compartment door&#39;s opening or closing, the storage compartment door being provided with the ejector. 
     In this embodiment, if the door in which the ice tray  110  is opened or closed, the ejector is rotated twice, whereby reliability in that the ices are discharged from the ice tray may be improved. The ejector is provided in the door, and if the door is opened or closed, the ejector moves along with the door. This is because that ices formed in the ice tray may return to the ice tray without being discharged from the ice tray in a special case if the ejector moves along with the door and at the same time is rotated to discharge the ices formed in the ice tray. 
     On the other hand, if the door is maintained at a closed state without being opened or closed, the ejector is rotated once. That is, if the door is maintained at a closed state without being opened or closed, the ejector provided in the door is rotated without moving along the door. Since it is not likely that ices are not discharged from the ice tray, waste of time may occur if the ejector is rotated twice. 
     Therefore, in this embodiment, whether the door is opened or closed may be sensed, whereby RPM of the ejector may be implemented differently. 
     First of all, for ice separation, the ejector starts to be rotated (S 100 ). Prior to ice separation, the full-ice sensing bar is rotated to sense full-ice, whereby it may be sensed whether ices are filled with the ice bank at a set height or more. 
     If the ejector  120  is rotated and thus the protrusion pin  124  moves to a set position, the heater  140  is driven to supply heat to the ice tray  110  (S 200 ). 
     A flag value is set to 0. In the flag value, 0 is an initial setup value, and the flag value may be set to other various values. 
     While the ejector  120  is being rotated, it is determined whether the storage compartment door is closed (S 210 ). The storage compartment door may mean the door provided with the ejector  120 . The storage compartment door may mean the refrigerating compartment door. Also, the storage compartment door may mean the door provided with the ice making compartment. 
     At this time, the door switching sensor  2600  may sense whether the storage compartment door is closed, and then may transmit related information to the controller  500 . The door switching sensor  2600  may be installed in a hinge unit which serves as a shaft for rotating the storage compartment, or may be installed in a portion where the door adjoins a cabinet. Therefore, the door switching sensor  2600  may sense whether the storage compartment door is maintained to seal the storage compartment. 
     The state that the storage compartment door is closed may mean the state that the storage compartment door is stopped after sealing the storage compartment. The state that the storage compartment door is not closed may include any one of the state that the storage compartment door is stopped at an opened state, the state that the storage compartment door is rotated to be opened, and the state that the storage compartment door is rotated to close the storage compartment. 
     If it is sensed that the storage compartment door is not closed in S 210 , rotation of the ejector  120  is stopped (S 220 ). This is because that an unnecessary force may be given to a user who holds the door when the ejector  120  is rotated in a state that the door is moving. Also, a force for rotating the ejector  120  and a force for rotating the door may be overlapped with each other, whereby ices may return to the ice tray  110  without being discharged from the ice tray  110 . 
     If it is sensed that the storage compartment door is closed in a state that rotation of the ejector  120  is stopped (S 222 ), the flag value is changed to another value not 0, that is, 1. If the value corresponding to 1 is another value different from the initial setup value, any value may be used as the value corresponding to 1. 
     The ejector  120  is rotated (S 226 ). The ejector  120  is maintained in a state that its rotation is stopped in S 220 , and then starts to be rotated at that position. Therefore, even though rotation of the ejector  120  is stopped in S 220 , the protrusion pin  124  of the ejector  120  is not required to move to an initial position or a specific position. 
     If it is sensed that the storage compartment door is closed in S 210 , the ejector  120  continues to be rotated without stop. The protrusion pin  124  may be rotated counterclockwise to reach position  4  of  FIG.  20 B , for example. That is, if the protrusion pin  124  is rotated to reach a preset position for stopping driving of the heater  140  (S 240 ), driving of the heater  140  is stopped (S 240 ). 
     In S 200 , if the protrusion pin  124  of the ejector  120  reaches the first setup position, the heater is driven. Afterwards, if the protrusion pin  124  continues to be rotated to finally reach a second setup position, driving of the heater is stopped. That is, the heater is turned off. 
     Meanwhile, even though it is determined that the storage compartment door is not closed in S 210 , since the ejector is again rotated in S 226 , the protrusion pin  124  reaches the second setup position in S 230 . Likewise even in this case, driving of the heater is stopped. 
     As the ejector continues to be rotated, the protrusion pin  124  reaches the initial position. If the ejector  120  is rotated to reach the initial position (S 250 ), it is checked whether the flag value set as above is 0 (S 260 ). 
     If the flag value is 1 not 0, the ejector is additionally rotated once more (S 270 ). At this time, the protrusion pin  124  starts to be rotated from the first setup position which is the initial position, and is again rotated to reach the first setup position which is the initial position. In this second rotation, the heater  140  is not driven, and the ejector is only rotated. 
     Since it is determined that the time when the ejector is rotated while the door is being rotated exists, for ice separation, it is not required to additionally ices attached to the ice tray  110 . This is because that the ejector is rotated to discharge ices, which may remain in the ice tray  110 , from the ice tray  110 . 
     On the other hand, if the flag value is 0 which is initially set, since the storage compartment door seals the storage compartment in a state that the storage compartment door is stopped while the ejector is being rotated, it is not likely that ices may remain in the ice tray due to one-time rotation of the ejector. Therefore, the ejector may be rotated once to increase the time required for ice making. This is because that ices cannot be generated even though the ice making compartment  2300  is driven to supply the cool air as water is not supplied to the ice tray while the ejector is being rotated and the ice tray is not filled with water. 
     Meanwhile, in this embodiment, one rotation may mean that the protrusion pin of the ejector is rotated at 360° or more based on the rotary shaft  124 . 
     In this embodiment, if it is likely that ices may remain in the ice tray, the ejector is rotated twice, and if not so, the ejector is rotated once, whereby the time required for ice making may be increased to increase the ice making amount. 
     Even though the ejector is rotated continuously twice, the heater is not driven during a second rotation of the ejector, whereby energy consumed by the heater may be saved. 
     It will be apparent to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the spirit and essential characteristics of the disclosure. Thus, the above embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the disclosure should be determined by reasonable interpretation of the appended claims and all change which comes within the equivalent scope of the disclosure are included in the scope of the disclosure.