Patent Publication Number: US-11033331-B2

Title: Method for controlling moving pattern for laser treatment and laser irradiation device using same

Description:
TECHNICAL FIELD 
     The present invention relates to a method of controlling motion pattern for a laser treatment and a laser irradiation apparatus using the same, which can control the motion pattern of the laser in the laser irradiation apparatus using a robot arm. 
     BACKGROUND ART 
     Today, a variety of laser treatment methods by irradiating the laser beam on the skin have been developed to achieve the purpose of treatment, etc., and have been still actively studying a medical laser apparatus for use the laser treatment methods. 
     The treatment methods using the laser has been using for a variety of purposes such as to promote hair growth or prevent hair loss, skin peel, skin regeneration, skin whitening, wrinkle or spot removal, or stain removal, etc. 
     However, a user, such as a physician, manually operates the laser treatment apparatus to perform the treatment in the conventional art. 
     Accordingly, there is a problem in that the reliability of the treatment may be decreased by lowering the accuracy of the treatment. 
     In addition, conventionally, there is an additional problem that of the treatment time for taking the laser is excessively too long. 
     DISCLOSURE 
     Technical Problem 
     An object of the present invention is to provide a method of controlling motion pattern for a laser treatment and a laser irradiation apparatus using the same, which can perform the efficient laser treatment. 
     Technical Solution 
     A method of controlling a motion pattern for a laser treatment, the method includes constituting a three-dimensional image of an object; setting a region of therapy on which a laser is irradiated on a surface of the object using the three-dimensional image; setting a guide path passing through the region of therapy; setting a plurality of laser irradiation points arranged on the guide path; and sequentially irradiating the laser on a position corresponding to each of the laser irradiation point among the surface of the object; wherein the guide path includes a first section for entering the region of therapy, a second section for linearly moving at the same speed within the region of therapy, and a third section for reentering to the region of therapy by moving along a curved path while varying the speed outside the region of therapy; and the laser is irradiated at a constant frequency in the second section. 
     An apparatus of controlling a motion pattern for a laser treatment, the apparatus includes a vision controlling unit for constituting a three-dimensional image of an object, and for setting a region of therapy irradiated the laser on the surface of the object, a guide path passing through the region of therapy, and laser irradiation points arranged on the guide path; a laser unit for sequentially irradiating the laser to a position corresponding to the laser irradiation points in the surface of the object; and a motion controlling unit for controlling movement of the laser unit and laser irradiation based on the set guide path and the laser irradiation points; wherein the guide path includes a first section for entering the region of therapy, a second section for linearly moving at the same speed within the region of therapy, and a third section for reentering to the region of therapy by moving along a curved path while varying the speed outside the region of therapy; and the laser is irradiated at a constant frequency in the second section. 
     On the other hand, the laser irradiation method is making a computer program for performing him may be provided in the program itself or stored in a recording medium, it can be performed by the laser irradiation apparatus according to an embodiment of the present invention. 
     In addition, the laser irradiation apparatus may use a wired or wireless network such as the Internet may be controlled as described above in conjunction with an external server. 
     Advantageous Effects 
     According to an embodiment of the present invention, it will be obtained following effects that the precision and the stability of the laser treatment may be improved, and the operating time required to perform the laser treatment may also be reduced. 
     Further, it may be possible to control the motion speed and the frequency inside and outside of a region of therapy in moving the laser using the robot arm, thereby more precisely controlling the positions of the laser irradiation point. 
    
    
     
       DESCRIPTION OF DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. 
         FIGS. 1 to 3  are block diagrams for explaining embodiments for the overall structure of a laser irradiation apparatus according to the present invention. 
         FIGS. 4 to 29  are views for explaining the structure and the operation of a laser irradiation apparatus according to embodiments of the present invention. 
         FIG. 30  is a flowchart illustrating a motion pattern control method for a laser treatment according to an embodiment of the present invention. 
         FIGS. 31 and 32  are views for explaining the first embodiment of a guide path in which the laser unit is moved. 
         FIGS. 33 and 34  are views for explaining a second embodiment of a guide path in which the laser unit is moved. 
         FIGS. 35 and 36  are views for explaining a second embodiment of a guide path in which the laser unit is moved. 
         FIG. 37  is a diagram for explaining an embodiment of a method of adjusting the position of the laser irradiation point. 
     
    
    
     BEST MODE 
     Detailed exemplary embodiments of the present invention will be described with reference to the accompanying drawings. 
     The present invention may be modified in various ways and implemented by various exemplary embodiments, so that specific exemplary embodiments are illustrated in the drawings and will be described in detail below. However, it is to be understood that the present invention is not limited to the specific exemplary embodiments, but includes all modifications, equivalents, and substitutions included in the spirit and the scope of the present invention. 
     On the other hand, although the first and/or the terms of the second and so on in the present invention can be used in describing various elements, but the above elements shall not be restricted to the above terms. These terms are only to distinguish one component from other components, for example within that range departing from the scope of the concept of the present invention, a first element could be termed a second element, Similarly, the second component may be named as a first component. 
     As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, it will be understood that when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements present. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     In the following description, it is explained as an example that the laser is irradiated to the facial skin of the patient for ease of explanation, but the apparatus and the method according to the present invention can be applied whatever as long as irradiating the laser beam on the surface of a given object. 
     The accompanying drawings are intended to illustrate aspects of the present invention, but the scope of the present invention is not limited to this. In addition, the attached drawings will be noted that the portion or component is disposed is enlarged/reduced to better explain the characteristics of the present invention. 
     Hereinafter, a laser irradiation apparatus using a robot arm and a method thereof according to the present invention is described in detail with reference to the accompanying drawings. 
       FIGS. 1 to 3  are block diagrams for explaining embodiments for the overall structure of the laser irradiation apparatus according to the present invention. 
     Referring to  FIG. 1 , the laser irradiation apparatus  10  may include a scanner  300 , a robot arm  100 , and a controlling unit  200 . 
     The scanner  300  may collect raw data by scanning an object. Here, the raw data may include two-dimensional image and depth information. 
     The two-dimensional image may include color information, the diagnosis of the particular condition, such as telangiectasia may be possible according to the color information of a patient&#39;s skin. Further, the scanner may detect the size, location, or depth information, etc. for pores, scars, or wrinkles of the patient&#39;s face using the two-dimensional images and the depth information. 
     The scanner  300 , as shown in  FIG. 2 , may include a color sensor  310  for photographing the two-dimensional color images, and an IR projector  320  and an IR sensor  330  for obtaining the three-dimensional depth data. 
     If the IR projector  320  may irradiate the IR light on the surface of an object  400 , that is the surface of the patients&#39; skin, the IR sensor  330  would obtain the depth data by detecting the IR light reflected from the surface of the object  400 . 
     The color sensor  310  may obtain the two-dimensional color image by photographing the surface of the object. 
     The robot arm  100  may have an end-effector (EE)  101 , as shown in  FIG. 3 , and irradiates the laser on the surface of the object  400  according to the control of the controlling unit  200 . Specifically, the robot arm  100  may irradiate with the laser to the surface of the object  400  in response to a guide path (GP) through the end-effector  101 . Such the robot arm  100  may be considered as a manipulator. 
     The controlling unit  200  may control the overall function and operation of the laser irradiation apparatus  10 . 
     The controlling unit  200  may include a vision controlling unit  210  and a motion controlling unit  220 . 
     The vision controlling unit  210  may receive the raw data having the two-dimensional image and the depth information transmitted from the scanner  300 , and configure the three-dimensional image of the object  400  on the basis of the raw data. 
     Here, the origin position of the raw data and the direction of the coordinates may vary depending on the object  400 , for example, the shape and volume of the face, or various causes such as the scan starting point of the scanner  300 , etc. 
     In addition, the vision controlling unit  210  may adjust the coordinates in alignment for the raw data. For this adjustment, the vision controlling unit  210  may detect the position of objects such as eyes, or a nose using face recognition algorithm, and obtain aligning homogeneous matrix. 
     The vision controlling unit  210  may set a region of interest (ROI) on the surface of the object  400  in the three-dimensional image. 
     The region of interest (ROI) may be a region including a portion that of requiring the laser irradiation, and set the region of interest (ROI) may be set by the user (e.g., physician), or may be automatically set by the three-dimensional image process. 
     For example, the user may set the region of interest (ROI) by clicking on the four corner points on the facial surface, and in this case, the normal vector corresponding to each of the corner point may be obtained. 
     On the other hand, the vision controlling unit  210  may determine at least one of the color or the contrast of the surface of the object  400  based on the data transmitted form the scanner  300 , and set the region of interest based on the determined result. 
     Specifically, the vision controlling unit  210  may detect a portion where the color or/and the contrast of the surface of the object  400  is (or are) different form the two-dimensional color image of the object  400  photographed by the scanner  300 . In addition, the vision controlling unit may set the region of the interest to be included the other portion where the color and/or contrast is (or are) different than another portion. 
     More specifically, the reason for darkly appearing a specific portion is mainly due to the pigment of the depth of the blood vessels, otherwise due to the shaded region by the contour of the skin. 
     Therefore, an algorithm may be applied to distinguish the regions which darkly appear due to the pigment or blood vessels of the face or darkly appear in the shade region due to the contour of the skin, and the dermatological treatment method may be changed depending on this distinction. 
     For example, if the shaded region, caused by the contour of the skin, is occurred, it is caused by the skin stain or the atrophy of the subcutaneous fat layer due to skin aging, thereby treating firmness treatment, fac implants, fillers, and the like. 
     Further, when the shaded region caused by the scar is occurred, it may be necessary the scar treatment. 
     In the following, it may be referred to as a region of therapy (ROT) which is necessary for treatment by irradiating the laser on the surface of the object. 
     For example, the region of therapy (ROT) may be liver spots, freckles, burn marks, tattoos, acne, dark circles, and the like, those are occurred in the human skin, the present invention is not limited to this, and it may be treatable regions by irradiating the laser of various kinds of wavelength or frequency. 
     The vision controlling unit  210  may determine this portion where color and/or contrast are different surroundings as the region of therapy (ROT). 
     According to an embodiment of the present invention, the region of interest (ROI) and the region of therapy (ROT) may be set separately as described above, but may be set only the region of therapy (ROT) which is actually irradiated as needed. 
     The vision controlling unit  210  constitutes a motion pattern on the object for the laser treatment on the basis of the determined (or set) information as described above, and the motion pattern may be configured by setting the guide path (GP) passing through the region of interest (ROI) or the region of therapy (ROT). 
     Then, the vision controlling unit  210  sets a plurality of points arranged on the guide path (GP). The plurality of points may represent the position where the laser is irradiated on the surface of the object, and the point on the guide path (GP) displayed on the two-dimensional image may be projected on the three-dimensional image. 
     In addition, the vision controlling unit  210  obtains the actual laser irradiation points to be irradiated on the surface of the object by selecting only those points positioned within the region of therapy (ROT) of the plurality of points arranged on the guide path (GP). 
     The motion controlling unit  220  controls the operation of the robot arm  100  on the basis of the information obtained by the vision controlling unit  210 , while the end-effector  101  irradiates the laser as closely moving to the surface of the object. 
     Here, the interval between the surface of both the end-effector  101  and the surface of the object during the laser irradiation are preferably and constantly maintained during the movement, the interval may be set based on a focal distance of the laser. 
     For example, the motion controlling unit  220  may control the movement and the laser irradiation of the robot arm  100  on the basis of the guide path (GP) and the laser irradiation points set in the vision controlling unit  210 . 
     In addition, the motion controlling unit  220  may emergently stop the laser irradiation by urgently stopping the robot arm  100 , for example, the operation of the robot arm  100  may be stopped by the action or the voice of the doctor or the patient. 
     The laser irradiation apparatus  10  according to the present invention may each operate in a manual mode or an automatic mode. 
     For example, in the automatic mode, the scanner  300  scans the surface of the object  400  to obtain the information about the surface of the object  400 , and the controlling unit  200  may irradiate with the laser on the surface of the object  400  by controlling the robotic arm  100  on basis of the obtained information. 
     On the other hand, in the manual mode, the user such as a doctor has the controlling authorization, the robot arm  100  is operated by the control of the user. 
     It has been described for the configuration of the laser irradiation apparatus with  FIGS. 1 to 3  as described above, the present invention shall not be limited, and some of the illustrated elements may be omitted or added additional elements as needed. 
     For example, the laser irradiation apparatus  10  further includes a computing unit (not shown) for performing a function of Artificial Intelligence (AI) and a database (not shown) for processing big data. 
     The laser irradiation method using the laser irradiation apparatus  10  according to the present invention will be described in detail with reference to the accompanying drawings. 
       FIGS. 4 to 25  are views for explaining the operation of the laser irradiation apparatus according to embodiments of the present invention, the same explanation as explained with reference to  FIGS. 1-3  of the operation and the construction of the laser irradiation apparatus  10  will be omitted below. 
     Referring to  FIG. 4 , the controlling unit determines whether the current setting mode is the automatic mode or not or not (step S 100 ). If the automatic mode is not, the controlling unit determines whether the current setting mode is the manual mode or not (S 110 ). 
     For example, the user may set by selecting one of the manual mode or the automatic mode using a button mounted in the laser irradiation apparatus  10  or a user interface (UI) provided in a touch screen. 
     It is determined that if the current setting mode is not the manual mode in the step S 110 , it is performed a different function previously predetermined (for example, Default setting) (S 120 ). 
     On the other hand, if the current setting mode is the manual mode, it is determined that the setting status of the manual mode (S 130 ), the controlling authorization is given to the user (S 140 ). 
     Here, the operation of giving the controlling authorization to the user means that the controlling unit  200  may judge for themselves and limit the operation of the robot arm  100 . 
     In the manual mode, the user may operate the robotic arm  100  on their own while performing the laser treatment. 
     On the other hand, it is determined that the current setting mode is the automatic mode in the step S 100 , the scanner  300  scans the surface of the object  400  according to the control of the controller  200  (S 150 ). As a result of the scanning by the scanner  300 , the raw data including the two-dimensional image and the depth information may be generated. 
     Here, a screen mode is available to be moved the irradiation position of the laser along the motion of the pointer on a monitor. 
     Then, the vision controlling unit  210  constitutes the three-dimensional image on the basis of the raw data obtained from the scanner  300  (S 160 ). 
     For example, the canner may scan a plaster cast of a head shape of a person, as shown  FIG. 5(A) , it may be constituted the three-dimensional image as shown  FIG. 5(B) . 
     Hereinafter, for convenience of explanation, it will be described where the plaster cast of the head shape is regarded as the object  400 . 
     After constituting the three-dimensional image, the region of interest (ROI) is set on the surface of the object  400  in the three-dimensional image (S 170 ). 
     For example, the first corner point (Pcor, 1), the second corner point (Pcor, two), the third corner point (Pcor, 3), and the fourth corner point (Pcor, 4) may be set on the surface of the object  400  in the three-dimensional image, as shown in  FIG. 5  (C). Then, the region of interest (ROI) may be set with a region partitioned by the vertices with four corner points such as the first, the second, the third and the four corner points. 
     In this embodiment, the region of interest (ROI) is set using the four corner points, but the number of corner points to be used the conditions may be changed. For example, it is possible to set the region of interest (ROI) by using at least three corner points. 
     Hereinafter, the first corner point (Pcor, 1), the second corner point (Pcor, two), the third corner point (Pcor, 3), and the fourth corner point (Pcor, 4) may be referred as the first point (P 1 ), the second point (P 2 ), the third point (P 3 ), and the fourth point (P 4 ), respectively. 
     Then, the guide path (GP) passing through the region of interest (ROI) may be set (step S 180 ). 
     For example, as illustrated in  FIG. 6 , it is possible to set the guide path (GP) within the region of interest (ROI). 
     The starting point of the guide path (GP), i.e. the point at which the laser irradiation is started, is expressed as Ps, while the end point of the guide path (GP), i.e. the point at which the laser irradiation is ended, is expressed as Pt. 
     Then, the laser is irradiated in sequence to the laser irradiation points on the surface of the object corresponding to the guide path (GP) (Step S 190 ). 
     The guide path (GP) may include a path where the robot arm  100  is irradiated with the laser. In other words, the robot arm  100  may irradiate with the laser to the surface of the object as moving in response to the guide path (GP). 
     The guide path (GP) may be regarded as including a path connecting the hitting point of the laser. 
     On the other hand, the regions of interest (ROI) may be set based on at least one a color, contrast, contour and texture of the surface of the object  400 . It will be explained with reference to  FIG. 7  as follows. 
     Referring to  FIG. 7 , in S 170  step of setting the region of interest (ROI), the color and/or contrast of the surface of the object  400  is firstly determined (step S 171 ). Here, the color and/or contrast of the surface of the object  400  may be determined from the two-dimensional color image of the object  400 . 
     Since, the determined value is compared with the reference value (S 172  step), the region of therapy (ROT), which is different surroundings at least one of contrast and contour, is detected from the surface of the object  400  according to the comparison result (step S 173 ). 
     For example, a region of normal (RON) and the region of therapy (ROT) may be distinguished on the basis of at least one of a color, contrast, contour and texture on the surface of the object  400 . 
     As shown in  FIG. 8 , when the total 16 of unit areas are arranged in 4×4 matrix form, the number expressed on each of the unit area may indicate the brightness value. 
     Here, it is assumed that the brightness value is 40, it is determined the region of therapy (ROT) with unit areas of (1, 1), (2, 1), (3, 1), (3, 2), (3, 3), (3, 4), (4, 1), (4, 2), (4, 3) and (4, 4) that the brightness value is smaller than 40, and the remained portion may be determined as the region of normal (RON). 
     The brightness of the region of therapy (ROT) may appear relatively darker than other portion, that is lower than the brightness of the region of normal (RON). Similarly, the color of the region of therapy (ROT) may appear relatively thicker than the color of the region of normal (RON). The thicker color means more darker than surroundings. 
     As such, the brightness value of the region of therapy (ROT) may be a lower portion than a predetermined reference brightness value. The reference brightness value may be varied in various ways depending on the surface state or characteristics (for example, contour or texture, etc.) of the object  400  or other factors such as the color tone. 
     Here, the reference brightness value may be a constant, but preferably may be set differently for each patient or treatment region. For example, the reference brightness value may be varied by considering a brightness value of the surrounding region to coincide the skin tone with a region adjacent to the region of therapy (ROT). 
     If the face of White is bright as a whole, the reference brightness value may be set relatively high based on the brightness value. The reason is that if the face is appeared with bright white as a whole, a portion requiring the treatment such as dots, spots required, i.e. the region of therapy, is more prominently appeared. 
     On the other hand, if the face is Mongoloid appeared relatively dark as a whole than Whites, the reference brightness value may be set relatively low compared with the brightness value of Whites. 
     After detecting the region of therapy (ROT), then the regions of interest (ROI) is set (S 174 ). 
     As described above, the region of interest (ROI) includes the region of therapy (ROT), the region of interest (ROI) and the region of therapy (ROT) may be equally set. 
     As illustrated in  FIG. 9(A) , it is assumed that the region of therapy (ROT), where brightness, color, contour, and texture, etc. are different within the region of normal RON, is included on a predetermined region (R 1 ) of the surface of the object  400 , the form of the region of therapy (ROT) is arbitrarily set for convenience of the description and the present invention is not limited thereto. 
     In this case, as illustrated in  FIG. 9(B) , it may be set the first, second, third, and fourth points (P 1 , P 2 , P 3 , and P 4 ) to be contacted the first line (L 1 ) connecting the first point (P 1 ) and the second point (P 2 ) with the region of therapy (ROT), the second line (L 2 ) connecting the second point (P 2 ) and the fourth point (P 4 ) with the region of therapy (ROT), the third line (L 3 ) connecting the third point (P 3 ) and the fourth point (P 4 ) with the region of therapy (ROT), and the fourth line (L 4 ) connecting the fourth point (P 4 ) and the first point (P 1 ) with the region of therapy (ROT). 
     In addition, regions divided with the first, the second, the third, and the fourth points (P 1 , P 2 , P 3 , and P 4 ) may be set as the region of interest (ROI). 
     Here, the region of therapy (ROT) may be also included inside of the region of normal (RON), the region of interest (ROI) may include one portion of the region of normal (RON) as well as the region of therapy (ROT). 
     Hereinafter, it is assumed that a portion included within the region of interest (ROI) in the region of normal (RON) is a second region of normal (RON 2 ) and the other portion does not include within the region of interest (ROI) in the region of normal (RON) is a first region of normal (RON 1 ). 
     In the case of  FIG. 9 , as setting the region of interest (ROI), it is described only one case that a line connecting two near points is contacted on the region of therapy (ROT), the present invention may not be limited thereto. 
     For example, as in a case of  FIG. 10 , at least one or all lines (L 1 , L 2 , L 3 , and L 4 ) connecting two near points is (or are) not in contact with the region of therapy (ROT). 
     Thus, the method of setting the region of interest (ROI) may be changed in various ways. 
     In case that the shape of the region of therapy (ROT) is the polygonal shape, it may be occurred that the region of therapy (ROT) and the region of interest (ROI) are same depending on the set position of the point. 
     On the other hand, the guide path (GP) is capable of being set within the region of therapy (ROT). 
     For example, it is possible to set the guide path (GP) with the zigzag form within the region of therapy (ROT), as shown in  FIG. 11 . 
     As such, the guide path (GP) is passing through the region of therapy (ROT), the laser is capable of being irradiated in the region of therapy (ROT). 
     On the other hand, it is possible to control the fluence and/or frequency of the laser in the beginning step and the end step of the laser irradiation. 
     The fluence of the laser represents the laser energy (J/cm 2 ) delivered per unit area, it may means the strength or intensity of the laser. And the laser frequency may means the emission frequency of the laser. 
     Referring to  FIG. 12(A) , at least one of the fluence or frequency of the laser is gradually raised in the beginning step of irradiating the laser, while at least one of the fluence or frequency of the laser is gradually decreased in the end step of the irradiating the laser. 
     In the following description, the beginning step of the laser irradiation is referred to an acceleration section (D 1 ), while the end step of the laser irradiation is referred to a reduction section (D 3 ). 
     As shown in  FIG. 12(B) , the moving speed of the robot arm  100  may be increased in the acceleration section (D 1 ). That is, the movement speed of the robot arm  100  may be accelerated. 
     The occurrence reason of the acceleration section (D 1 ) is because it takes some time from the time of supplying the power operating the robot arm  100  to the motor to the time of reaching the desired rotation speed. 
     In addition, in the deceleration section (D 3 ), the moving speed of the robot arm  100  may be reduced. The reason why the deceleration section D 3  is generated is that it takes some time from the time of shutting out the power supply to the motor operating the robot arm  100  to the stop of the motor similarly to the acceleration section D 1 . 
     In this way, when the fluence and/or frequency of the laser is gradually risen in acceleration section (D 1 ) and is gradually decreased in the deceleration section (D 3 ), it may be possible to uniformly irradiate the laser. 
     The fluence and/or frequency of the laser may be substantially proportional to the moving speed of the robot arm  100 . 
     At this time, a maintain section (D 2 ) may be occurred between the acceleration section (D 1 ) and the deceleration section (D 3 ), the fluence and/or frequency may substantially and constantly be maintained in the maintain section (D 2 ) if the laser irradiation is not stopped. 
     The speed of the robot arm  100  may be substantially and constantly maintained in the maintain section (D 2 ), for example, the speed of the arm  100  may be constantly maintained during the section (D 2 ) from the time at which the acceleration of the robot arm  100  is ended to the time at which the deceleration is started. 
     As shown in  FIG. 13(A) , it may be possible that of increasing with step curve the fluence and/or frequency of the laser in the acceleration section (D 1 ) or decreasing in the deceleration section (D 3 ). 
     In this case, it may be considered to gradually raise the fluence and/or frequency of the laser in the acceleration section (D 1 ), and gradually decrease the fluence and/or frequency of the laser in the deceleration section (D 3 ). 
     On the other hand, the guide path (GP) may be possible to deviate outside the region of therapy (ROT) within the region of interest (ROI). 
     For example, as shown in  FIG. 14  when the region of interest (ROI) include the region of therapy (ROT) and the region of normal, i.e., the second region of normal (RON 2 ), the guide path (GP) may be passed all regions of the region of therapy (ROT) and the second region of normal (RON 2 ). 
     In this case, the robot arm for irradiating the laser is turned on in correspondence to the region of therapy (ROT) or turned off in correspondence with the second region of normal (RON 2 ). 
     Thus, it is possible to set the guide path (GP) without the relationship of the shape of the region of therapy (ROT) within the region of interest (ROI). 
     Further, the guide path (GP) includes a portion passing through the region of therapy (ROT) and the other portions (T 1 , T 2 , T 3 , and T 4 ) passing through the region of normal (RON 2 ) deviating outside the region of therapy (ROT). 
     As shown in  FIG. 15 , the robot arm  100  may turn off the laser irradiation corresponding to the portion passing through the second region of normal (RON 2 ) in the guide path (GP). In other words, it is considered that the robot arm  100  may turn on/off the laser irradiation depending on at least one color, brightness, and contour of the surface of the object  400  in the course of irradiating the laser along the guide path (GP). 
     That is, the robot arm  100  moves corresponding to the guide path (GP) and may turn on the laser irradiation corresponding to the portion, where the color is appeared more darker or the brightness is lower than the surroundings, that is the region of therapy (ROT) and turn off the laser irradiation corresponding to the portion, where the color is appeared more lighter or the brightness is higher than the surroundings, that is the region of normal (RON). 
     Referring to  FIG. 15 , it may be known that the laser frequency and/or fluence is set substantially zero in the portions (T 1 , T 2 , T 3 , and T 4 ) where the robot arm  100  is passing through the second region of normal (RON 2 ). 
     In this case, the movement of the robot arm is possible to maintain substantially and constantly, thereby improving the accuracy of the treatment. 
     On the other hand, it is possible to adjust at least one of the frequency, the irradiation time, the number of the laser irradiation, the fluence of the laser depending on the degree of color and/or brightness of the region of therapy (ROT) under the control of the motion controlling unit  220 . 
     Referring to  FIG. 16 , the region of therapy (ROT) may include the first region of therapy (ROT 1 ) and the second region of therapy (ROT 2 ). 
     Here, the color of the second region of therapy (ROT 2 ) may be darker than the first region of therapy (ROT 1 ), or the brightness of the second region of therapy (ROT 2 ) may be lower than the brightness of the first region of therapy (ROT 1 ). 
     Alternatively, the brightness of the second region of therapy (ROT 2 ) may be lower than the critical brightness value predetermined in advance, while the brightness of the first region of therapy (ROT 1 ) may be higher than the critical brightness value predetermined in advance. 
     In this case, the second region of therapy (ROT 2 ) may be considered as a portion required intensive care compared to the first region of therapy (ROT 1 ). 
     In this embodiment of the present invention, it is referred to as the first point X 1  for a boundary point between the second region of normal (RON 2 ) and the first region of therapy (ROT 1 ) on the guide path (GP) as sequentially moving at the starting point Ps of the laser, the second point X 2  for a boundary point between the first region of therapy (ROT 1 ) and the second region of therapy (ROT 2 ), the third point X 3  for a boundary point between the second region of therapy (RON 2 ) and the second region of normal (ROT 2 ), the fourth point X 4  for a boundary point between the second region of normal (RON 2 ) and the first region of therapy (ROT 1 ), the fifth point X 5  for a boundary point between the first region of therapy (ROT 1 ) and the second region of therapy (ROT 2 ), the sixth point X 6  for a boundary point between the second region of therapy (ROT 2 ) and the first region of therapy (ROT 1 ), the seventh point X 7  for a boundary point between the first region of therapy (ROT 1 ) and the second region of therapy (ROT 2 ), and the eighth point X 8  for a boundary point between the second region of therapy (ROT 2 ) and the first region of therapy (ROT 1 ). 
     As shown in  FIG. 17 , the robot arm may turn off the laser irradiation in sections from the start point (Ps) of the laser to the first point (X 1 ) and from the third point (X 3 ) to the fourth point (X 4 ), respectively. 
     For example, since Ps-X 1  section and X 3 -X 4  section are included in the second region of normal (RON 2 ), thus the robot arm  100  may not irradiate the laser. 
     On the other hand, the frequency of the laser is set at the first frequency (f 1 ) in X 1 -X 2  section, X 4 -X 5  section, X 6 -X 7  section and the section from the eighth point (X 8 ) to the beginning of the deceleration section (D 3 ). 
     And, it may be gradually varied the gradation of the irradiation conditions through the variations of the laser irradiation frequency or the laser irradiation fluence by the variation in velocity of the end-effector  101 , or the adjustment of the laser fluence or pulse duration in X 1 , X 3  and X 4  points. 
     Further, in the other points except X 1 , X 3  and X 4  points, the gradation of the irradiation conditions as described above may be gradually achieved. 
     On the other hand, in X 2 -X 3 , X 5 -X 6 , and X 7 -X 8  sections, the frequency of the laser may set with a second frequency (f 2 ) that is higher than the first frequency (f 1 ). 
     In this case, the laser, which is relatively stronger, may be irradiated on the second region of therapy (ROT 2 ) thereby improving the treatment efficiency. 
     Referring to  FIG. 18(A) , the frequency of the laser may equally set as the first frequency (f 1 ) in X 1 -X 3  section, X 4 -X 8  section and a section from the eighth point (X 8 ) to the beginning of the deceleration section (D 3 ). 
     Thus, while maintaining the frequency of the laser, as shown in  FIG. 18(B) , the movement speed of the robot arm  100  may set at the first speed (V 1 ) in a section from a point of the end of the acceleration section (D 1 ) to the second point X 2 , X 3 -X 5  section, X 6 -X 7  section, and the section from the eighth point (X 8 ) to the beginning of the deceleration section (D 3 ). 
     On the other hand, the movement speed of the robot arm  100  may be set at the second speed (V 2 ) which is slower than the first speed (V 1 ) in X 2 -X 3 , X 5 -X 6 , and X 7 -X 8  sections. 
     In this case, the laser may irradiate relatively longer than the second region of therapy (ROT 2 ) thereby improving the treatment efficiency. 
     That is, in the case that the speed of the end-effecter (EE) and the fluence of the laser are constant and the emission frequency of the laser is higher, the overlapping rate of the laser is relatively higher in the second region of therapy (ROT 2 ), thereby providing more amount of the laser energy. 
     On the other hand, for the second region of therapy (ROT 2 ), the number of the treatment may be set a lot more than the first region of therapy (ROT 1 ). For this, it will be described below referring to  FIG. 19 . 
       FIG. 19(A)  shows the status that the robot arm  100  may irradiate the laser for the first laser treatment on the surface of the object  400  along the guide path (GP) within the region of interest (ROI), while  FIG. 19(B)  shows the status that of performing the second laser irradiation carried out after the end of the first laser treatment. 
     Referring to  FIG. 19(A) , the robot arm  100  may irradiate the laser in X 1 -X 3  section, X 4 -X 8  section and a section from the eighth point (X 8 ) to before the deceleration section (D 3 ), in which the frequency of the laser may be equally set at the first frequency (f 1 ). 
     Referring to  FIG. 19(B) , in the second course of the laser treatment, the robotic arm  100  may irradiate the laser in X 2 -X 3  section, X 5 -X 6  section, and X 7 -X 8  section corresponding to the second region of therapy (ROT 2 ), in which it may be equally set to the frequency of the laser corresponding to the difference between the second frequency (f 2 ) and the first frequency (f 1 ). 
     Thus, the therapeutic effect similar to that of irradiating the laser of the second frequency (f 2 ) may be occurred in the second region of therapy (ROT 2 ). 
     On the other hand, it may be preferable to set the guide path (GP) with the spiral type. It will be explained in detail as below. 
     Referring to  FIG. 20 , it is possible to set the guide path (GP) of helical type to start from the central region of the region of interest (ROI) and to end at the outer periphery. That is, the starting point (Ps) of the guide path (GP) may be located in the central region of the region of interest (ROI) relatively more than the end point (Pt). 
     Thus, if the guide path (GP) is set to be the helical type, the robot arm  100  is prevented from suddenly changing directions, so that the laser may be more uniformly irradiated to the surface of the object  400 . 
     Even in the case of setting the guide path (GP) of helical type, as shown in  FIG. 21 , the guide path (GP) may pass through both the second region of normal (RON 2 ) and the region of therapy (ROT) together. 
     In this case, the laser irradiation may be turned off at the portions (T 11 , T 12 , and T 13 ) passing through the second region of normal (RON 2 ) on the guide path (GP). 
     Referring to  FIG. 22 , it is also possible that the guide path (GP) may be out of the region of interest (ROI). In such a case, the therapeutic effect may be enhanced by irradiating more densely the laser onto the region of therapy (ROT). 
     It is possible to turn off the laser irradiation corresponding to a portion that deviates from the region of interest (ROI) on the guide path (GP). 
     The shape of the guide path (GP) may be variously changed under the spiral condition. 
     For example, as in the case of  FIG. 23 , it is possible to set the guide path (GP) with the elliptical shape when the region of therapy (ROT) is formed with the elliptical shape. 
     According to the present invention, as in the case of  FIG. 24 , the end-effector  101  of the robot arm  100  preferably irradiates the laser approximately perpendicular to the surface of the object  400  to increase the therapeutic efficacy and to improve the treatment accuracy. 
     To this end, the robot arm  100  may be desirable with degree of freedom (DOF). Specifically, the robot arm  100  may be more desirable to have 5 degrees of freedom, and it is preferably have at least 6 degrees of freedom for exceptional circumstances. 
       FIG. 25  illustrates the structure of the laser irradiation apparatus according to an embodiment of the present invention. The laser irradiation apparatus includes a laser emitter, a motor, a motor drive, a reflection mirror, and an end effector (EE) irradiate the laser onto the surface of the object  400 , that is the plaster cast of the head shape. 
     Referring to  FIG. 25 , the motor and the motor drive operate the robot arm  100 . When the laser emitter irradiates the laser, the reflection mirror reflects the laser at a predetermined angle to reach the end-effector (EE), the end-effector (EE) connected to the end terminal of the robot arm  100  may irradiate the laser on the surface of the object  400 . 
     For example, the motor and the motor drive may be controlled by the motion controlling unit  220  so that the end-effector (EE) is moved along the guide path (GP) set by the vision controlling unit  210 . 
     In addition, the laser emitter may be controlled by the motion controlling unit  220  so that the laser is irradiated onto the laser irradiation points set by the vision controlling unit  210 . 
     Referring to  FIG. 26 , it may be seen that the guide path (GP) is set in a spiral on the surface of the object  400 .  FIG. 26  shows that it is photographed the laser irradiation on the surface of the object  400  in a constant duration and implemented by the shape of the guide path (GP). 
     On the other hand, it is possible to stop the laser irradiation depending on the conditions or modify the guide path. It will be described as follows. 
     Referring to  FIG. 27 , the motion of the object  400  may be determined after setting the guide path (GP) or irradiating the laser (S 200 ). For example, if the object  400  is a person&#39;s head, it may be determined whether there is a movement in a corresponding section or not by looking at a specific body such as a nose, both eyes. Or, if the surface of the object  400  is moved, for example, the skin of a person is moved cause by the reasons such as convulsions in the skin of a person&#39;s face, it may be considered that the movement of the object  400  is exist. 
     As determined result, if there is no motion of the object  400 , it may be maintained a predetermined guide path (GP) (S 210 ). 
     On the other hand, if it is determined that the motion of the object  400  may be measured, it may measure the amount of motion of the object ( 400 ) (S 220 ). The measurement of the amount of motion of the object  400  means to be determined that how much the object  400  is moved. 
     It is determined that whether the amount of motion exceeds a threshold range previously set or not as the result of measuring the motion amount (S 230 ). 
     It determined that, if the amount of motion of the object  400  is greater than the threshold range previously set, it is possible to perform an emergency stop mode (S 240 ). In this case, it is possible to urgently stop the laser irradiation. 
     On the other hand, if the amount of motion of the object  400  does not exceed the threshold range, the region of interest (ROI) may reset in consideration of the motion amount (S 250 ). 
     In this embodiment, it is considered that the motion controlling unit  220  compensates or corrects the guide path, when the scanner  300  captures the motion of the object  400 , and the vision controlling unit  210  newly set the region of interest (ROI). 
     In addition, the guide path (GP) may also be modified corresponding to the reset of the region of interest (ROI) (S 260 ). 
     For example, as in the case of  FIG. 28 , if the object  400  is moved toward left upper side 1 cm, then the region of interest (ROI) is also moved toward the left upper side 1 cm. Correspondingly, the guide path (GP) may also be moved toward the upper left 1 cm. 
     Then, the laser may be irradiated on the surface of the object  400  corresponding to the modified guide path (GP) (S 270 ). 
     As such, if the motion of the object  400  is occurred in the laser treatment process, it may be possible to modify the guide path (GP) according to the motion of the object  400 . 
     On the other hand, in the above description, the object  400  is moved up, down, left or right on the same plane, it may be also be adapted when moving back and forth by maintaining the interval between the end-effecter (EE) of the laser irradiation apparatus and the surface of the object  400 . 
     In case that the vibration is generated in the laser irradiation apparatus  10  and the force is applied, it is possible to perform the emergency stop mode. 
     For example, as shown in  FIG. 29 , it may be determined that whether or not the vibration is generated or the force is applied after setting the guide path (GP) or irradiating the laser (S 300 ). 
     As determined result, if the vibration is not generated or the force is not applied, it may be maintained the predetermined guide path (GP) (S 310 ). 
     On the other hand, it is determined that the vibration is generated, or the force is applied, it can measure the vibration and/or the force (S 320 ). 
     As the measured result, it may be determined that whether the vibration is generated more than a reference value previously set, or applied the force over more than a threshold value previously set (S 330 ). 
     As the measured result, if the vibration is generated more than the reference value, or applied the force over more than the threshold value, it may perform the emergency stop mode (S 340 ). In this case, it is possible to urgently stop the laser irradiation. 
     On the other hand, if the vibration is generated more less the reference value, or applied the force lower more than the threshold value, it may reset the region of interest (ROI) in consideration of the vibration and/or the force (S 350 ). 
     In addition, the guide path (GP) may also be modified corresponding to the reset of the region of interest (ROI) (S 360 ). 
     Then, the laser may be irradiated on the surface of the object  400  corresponding to the modified guide path (GP) (S 370 ). 
     For example, the laser irradiation apparatus  10  may be urgently stopped to stop the laser irradiation where the vibration equal to or larger than the reference value is generated in the robot arm  100  when someone touches the laser irradiation apparatus or touches a table on which a patient is lying, or an earthquake occurrence in the course of the treatment procedure. Alternatively, the laser irradiation apparatus  10  may be urgently stopped to stop the laser irradiation, during the treatment procedure, the user (doctor or the like) finds a procedure error and holds the robot arm  100  by hand thereby applying the force equal to or greater than a threshold value to the robot arm  100 . 
     As shown in  FIG. 25 , when the robot arm  100  having a predetermined degree of freedom is operated to sequentially irradiate the laser along the guide path (GP) on the surface of the object through the end-effector (EE), it is preferable to set the guide path (GP) so that the operation of the robot arm  100  may be easily controlled. 
     For example, it is preferable that the motion of the robot arm  100  or the motion pattern of the end-effector (EE) may be continuous, and the speed variation is minimized. In this case, it may be precisely controlled according to the guide path (GP) previously set and the laser irradiation points. 
     According to an embodiment of the present invention, the guide path (GP) passes through both the inside and outside of the region of therapy (ROT), and the robot arm  100  is operated at a constant moving speed and by the laser scanning frequency. Therefore, the motion of the robot arm  100  or the motion pattern of the end-effector (EE) may be performed with continuous and the speed control may be facilitated. 
       FIG. 30  is a flowchart illustrating the method of controlling the motion pattern for the laser treatment according to an exemplary embodiment of the present invention. Referring to  FIG. 30 , the method of controlling the motion pattern of the laser irradiation apparatus will be described in connection with a block diagram of the configuration of the embodiment of the present invention. In the meantime, the description of the motion pattern control method for the laser treatment, which is the same as that described with reference to  FIGS. 1 to 29 , will be omitted hereunder. 
     Referring to  FIG. 30 , the vision controlling unit  210  constitutes the three-dimensional image of an object (step S 2100 ), and sets the region of therapy (ROT) in which the laser is irradiated on the surface of the object using the three-dimensional image. 
     Thereafter, the vision controlling unit  210  sets the guide path passing through the region of therapy (ROT) (step S 2120 ), and sets the plurality of the laser irradiation points arranged on the guide path (GP) (step S 2130 ). 
     The guide path (GP) set in step S 2120  may include the first section for entering the region of therapy (ROT), the second section for linearly moving at the same speed within the region of therapy (ROT), and the third section for re-entering the region of therapy (ROT) by curving and moving while changing the speed at the outside of the region of therapy (ROT). 
     The motion controlling unit  220  controls the robot arm  100  to irradiate the laser at positions corresponding to the laser irradiation points set at the step S 2130  among the surfaces of the object (S 2140 ). 
     The laser may be irradiated at a constant frequency in the second section of the guide path (GP), and the interval between adjacent laser irradiation points may be constantly maintained as the moving speed of the end effector (EE) of the robot arm  100  is constantly controlled. 
       FIGS. 31 to 36  are diagrams for explaining embodiments of the guide path (GP) in which the laser unit of the robot arm  100  is moved. Hereinafter, the case where the region of therapy (ROT) has a rectangular shape is described as an example, but the shape or size of the region of therapy (ROT) may be various. 
     Referring to  FIG. 31 , the laser irradiation points may be set to form the plurality of rows by horizontally and vertically arranging at regular intervals in the region of therapy (ROT). 
     For example, the plurality of rows of the laser irradiation points may be present in the region of therapy (ROT), since the laser irradiation points PE 1 , PE 2 , and PE 3  arranged at regular intervals in the vertical direction constitute the first row R 1 , and the other laser irradiation points arranged in the vertical direction at regular intervals adjacent in the downward direction constitute the second row R 1 . 
     In this case, the guide path (GP) includes the first section (GP 1 ) which moves from the starting point Ps to a constant velocity (v_ 1 ) and enters the region of therapy (ROT), the second section (GP 2 ) that linearly moves to the region of therapy (ROT) to a constant velocity (v_ 2 ) within the region of therapy (ROT), and the third section (GP 3 ) that curves out of the region of therapy (ROT) and re-enters the region of therapy (ROT). 
     In the second section (GP 2 ) of the guide path (GP), the laser is irradiated while maintaining a predetermined frequency, and then the laser may be sequentially irradiated with the interval between the laser irradiation points previously set. 
     In the third section (GP 3 ) of the guide path (GP), the laser is moved along a curved path while changing the speed from the first row (R 1 ) of the laser irradiation points and may enter the second row (R 2 ) immediately adjacent in the vertical direction. 
     For example, the moving speeds (V_ 1  and V_ 2 ) in the first section (GP 1 ) and the second section (GP 2 ) of the guide path (GP) may be equal to each other, and the moving speed in the third section (GP 3 ) of the guide path (GP) is gradually decreased from the moving speed (V_ 2 ) in the second section (GP 2 ) to the constant speed (V_ 3 ) to be moved to the farthest position from the region of therapy (ROT), and is gradually increased from the constant speed (V_ 3 ) in the third section (GP 3 ) to the moving speed (V_ 2 ) in the second section (GP 2 ) to enter the second row R 2 . 
     As described above, the operation of the robot arm  100  may be more precisely controlled in the structure in which the laser is moved and irradiated by the robot arm equipped with the end-effector by maintaining the constant speed for the motion pattern in the region of therapy (ROT) and varying the speed coinciding with the curved movement for the motion pattern outside the region of therapy (ROT). 
     The laser is irradiated to the first row (R 1 ) and the second row (R 2 ) forming the laser irradiation points and, as shown in  FIG. 32 , then the second section (GP 2 ) and the third section (G 3 ) of the guide path (GP) may be repeated and the irradiation of positions corresponding to all the laser irradiation points in the region of therapy (ROT) may be completed. 
     After the irradiation of the positions corresponding to all of the laser irradiation points is completed, the guide path (GP) may include the fourth section (GP 4 ) for deviating from the region of therapy (ROT) to move at the end point Pt with a constant speed (V_ 4 ). 
     The moving speed (V_ 4 ) in the fourth section (GP 4 ) of the guide path (GP) may be set equal to the moving speeds (V_ 1  and V_ 2 ) in the first section (GP 1 ) and the second section (GP 2 ). 
     Referring to  FIGS. 31 and 32 , the moving pattern is described under condition that the laser is irradiated while moving the laser unit of the robot arm  100  in both directions, that is, from left to right and from right to left. The present invention is not limited thereto, however, and the laser of the robot arm  100  may be irradiated while moving in one direction. 
     According to yet another embodiment of the present invention, in the third section (GP 3 ) of the guide path (GP), it may be set to move along the curved path between two rows which are not adjacent to each other in the vertical direction among the plurality of rows forming the laser irradiation points. 
       FIG. 33 , in the third section (GP 3 ) of the guide path (GP), the laser is moved along the curved path while changing the speed out from the first row R 1  of the laser irradiation points, and the laser may enter the ninth raw R 9  that is not immediately adjacent in the vertical direction. 
     Thereafter, the laser is sequentially irradiated on the laser irradiation points of the ninth row R 9 , and it is possible to enter the second row R 2  on the upper side which is not just adjacent in the vertical direction by curving and moving from the ninth row R 9  while varying the speed. 
     As described above, since the rows, spaced apart from each other with one or more rows, are moving in a curve section moving outside the region of therapy (ROT), it is possible to precisely control the operation of the robot arm  100  by increasing the distance of the curved movement section. Also, the laser is irradiated the laser irradiation points adjacent to each other in a short time, thereby preventing the deterioration of the skin. 
     After the laser is irradiated on the first row R 1 , the ninth row R 9  and the second row R 2  forming the laser irradiation points, as shown in  FIG. 34 , the laser irradiation of positions corresponding to all the laser irradiation points in the region of therapy (ROT) may be completed by repeating the second section (GP 2 ) and the third section (GP 3 ) of the guide path (GP). 
     Although the present invention has been escribed with reference to  FIGS. 31 to 34  as an example in which the laser is sequentially irradiated to the laser irradiation points adjacent to each other, the present invention is not limited to this, and the laser irradiation order for the laser irradiation points may be changed by considering the degree of pain experienced by the patient. 
     According to another embodiment of the present invention, the laser may be irradiated by skipping one or more laser irradiation points among the plurality of laser irradiation points forming the same row in the region of therapy (ROT), and the laser unit of the robot arm  100  may be moved to a row on the previous guide path (GP) to irradiate the laser on the skipped laser irradiation point. 
       FIGS. 35 and 36  are shown for explaining another embodiment of the guide path in which the laser unit is moved, and it will be omitted the explanations of the guide path and the laser irradiation method which are the same as those described with reference to  FIGS. 31 to 34 . 
     Referring to  FIG. 35 , the guide path (GP) includes the first section (GP 1 ) which moves from a starting point Ps to a fixed speed v_ 1  and enters the region of therapy (ROT), the second section (GP 2 ) which irradiates the laser while linearly moving at a constant speed within the region of therapy (ROT), the third section (GP 3 ) which moves along the curved path out from the region of therapy (ROT) and re-enters the region of therapy (ROT), the fourth section (GP 4 ) which deviates from the region of therapy (ROT) to move at the end point Pt with a constant speed V_ 4 , and the fifth section (GP 5 ) for moving from the end point Pt to the start point Ps. 
     In the second section (GP 2 ) of the guide path (GP), the laser may be sequentially irradiated by skipping one laser irradiation point among the plurality of laser irradiation points. 
     For this purpose, the speed of moving the laser unit of the robot arm may be faster than that described with reference to  FIGS. 31 to 34 , or the laser irradiation frequency may be lower than that described with reference to  FIGS. 31 to 34  in the second section (GP 2 ). 
     Also, the laser is moved along the curved path while varying the speed from the first row R 1  of the laser irradiation points and entered to the second row R 2  just adjacent in the vertical direction in the third section (GP 3 ) of the guide path (GP). 
     After the laser is irradiated on the first row R 1  and the second row R 2  forming the laser irradiation points, the laser irradiation of some of the laser irradiation points in the (ROT) may be completed by repeating the second section (GP 2 ) and the third section (GP 3 ) of the guide path (GP). 
     After the laser irradiation is completed to the irradiation of the positions corresponding to all of the laser irradiation points, the guide path (GP) may include the fourth section for deviating from the region of therapy (ROT) to move at the end point Pt with a constant speed (V_ 4  (GP 4 ). 
     Thereafter, the laser unit may be moved along the curved path to return from the end point Pt to the start point Ps in the fifth section (GP 5 ) to irradiate the positions of the laser irradiation points in the region of therapy (ROT) where the laser is not irradiated. 
     After the laser unit of the robot arm is returned to the starting point Ps, the laser is irradiated on the laser irradiation points which are not irradiated with the laser along to the guide path (GP) as shown in  FIG. 36 , then the laser irradiation of all laser irradiation points may be completed. 
     The methods of controlling the guide path (GP) and the laser irradiation as described with reference to  FIGS. 35 and 36 , are for reducing the pain that the patient may feel as continuously irradiating to an adjacent position of the human surface. For example, it may be applied when “painless mode” is selected in the laser irradiation apparatus according to the present invention. 
     In the above description as an example that the laser is irradiated although one of the laser irradiation points is skipped. However, two or more laser irradiation points may be skipped to be irradiated the laser, thereby further reducing the pain of the patient. 
     As shown in  FIGS. 35 and 36 , the laser may be irradiated while moving two times the entire region of therapy (ROT) of the patient&#39;s face. In addition, after the laser may be irradiated to two or more rows, the laser unit may be returned to the previous row to irradiate on the irradiation points where the laser is not irradiated. 
     Here, the function of irradiating the laser to the specific point two or more times may be added by overlappingly irradiating the laser to the point where the laser is already irradiated. 
     The method of irradiating the laser by skipping one or more laser irradiation points may be applied separately from the application of the guide path (GP) which moves along the curved path outside the region of therapy (ROT). 
     As described above, it is determined the laser treatment conditions that whether to skip several laser irradiation points, to irradiate again the laser by returning to the previous position after the laser for several rows is irradiated, or to apply the guide path (GP) which moves along the curved path outside the region of therapy (ROT). The laser treatment conditions may be set according to various conditions such as the purpose of the treatment, the therapeutic effect, the treatment stage, and the degree of the pain felt by the patient. 
     However, the movement of the robot arm  100  may be set with the continuous motion pattern, even in such a case the movement of the robot arm  100 , more specifically, the movement of the joints constituting the robot arm  100  may be discontinuous. 
     When the laser is irradiated at a position where the motion of the robot arm  100  is discontinuous, and the positions of the laser irradiation points previously set may be irregular since the position already irradiated may not be precisely controlled. 
     Thus, according to another embodiment of the present invention, the position of at least one of the plurality of laser irradiation points may be adjusted such that the laser is not irradiated at the position where the motion of the robot arm  100  is discontinuous. 
       FIG. 37  is a diagram for explaining an embodiment of the method of adjusting the position of the laser irradiation point. 
     Referring to  FIG. 37( a ) , the movement of the robot arm  100  (indicated by a solid line) may be discontinuous depending on an event, and the laser irradiation points (PE 2 , PE 3 , and PE 4 ) may be set a position where the movement of the robot arm  100  may be discontinuous. 
     In this case, the positions of the laser irradiation points PE 2 , PE 3 , and PE 4  may be adjusted to a position having continuous motion as shown in  FIG. 37( b )  so that the laser is not irradiated at the position where the motion of the robot arm  100  is discontinuous. 
     Although the embodiment of the present invention has been described with reference to the laser irradiation apparatus using the robot arm, but the present invention is not limited thereto. 
     In addition, it may be applicable to control movement patterns in various types of apparatus of a gantry type laser irradiation apparatus for wrapping a patient&#39;s face or the laser irradiating apparatus in the shape of a laser array patch attached to a patient&#39;s face. 
     Further, although the present invention is described as the example with reference to the laser irradiation apparatus using the robot arm, the technical construction of the present invention may be applicable to a variety of energy based medical device, for treating the skin, using the high frequency, ultrasound, IPL (Intense Pulse Light), Psoralen-UV-A (PUVA), etc. 
     The laser irradiation methods using the robot arm according to the present invention may be stored in a computer-readable recording medium manufactured as a program to be executed in a computer, examples of the computer-readable recording medium include ROM, RAM, CD-ROM, a magnetic tape, a floppy disc, optical data storage devices, and it is implemented in the form of carrier waves (such as data transmission through the Internet). 
     Further, the computer-readable recording medium is distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. Then, the functional (functional) programs, codes, and code segments for accomplishing the present invention can be easily construed by programmers skilled in the art to which the invention pertains. 
     In this way, the above-described technical construction of the present invention it will be appreciated that without the person skilled in the art changing the technical spirit or essential features of the invention may be embodied in other specific forms. 
     Therefore, the embodiment described in the above examples should be understood as not be illustrative and not restrictive in all respects, and becomes the scope of the invention is indicated by the claims below rather than the foregoing description, the meaning and scope of the claims and all such modifications as derived from the equivalent concept be construed as being included in the scope of the invention.