Abstract:
A laser depilatory device is provided where the tips of skin hairs can be trimmed evenly after cauterization and the skin hair can he removed efficiently with lower power consumption, while preventing the direct adverse influent of het on the human skim The laser device includes: a housing including a contacting surface to which a skin surface is contacted and a recessed portion formed on the contacting surface; a laser light generating section disposed in the housing for generating laser light; and a first hole portion formed on an inner wall surface of the recessed portion for emitting the laser light through a space inside the recessed portion towards the inner wall.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of prior International Application No. PCT/JP2012/006118 filed on Sep. 26, 2012, which is based upon and claims the benefit of priority from Japanese Patent Application No. 2011-219378 filed on Oct. 3, 2011; the entire contents of all of which are incorporated herein by reference. 
     
    
     FIELD 
       [0002]    Embodiments described herein relate generally to a laser depilatory device for removing skin hair with irradiating laser light. 
       BACKGROUND 
       [0003]    Conventionally, a non-electric powered device such as a razor or a tweezer has been known as a device which removes hair such as facial hair or leg and arm hair (i.e., hair removal or hair depilation). The usage of this kind of non-electric powered device frequently entails botheration and a discomfort feeling. The usage of this kind of non-electric powered device also imparts a direct stimulation or a damage to a skin. On the other hand, a so-called dry shaver is known to be provided as an electromechanical device. This kind of dry shaver is capable of being used inside a vehicle. In this kind of dry shaver, an electromechanical razor is widely used which does not impart a significant damage to a skin. In the electromechanical razor, a rotational blade is configured to be rotated by, e.g., a motor. For this reason, the electromechanical razor sometimes generates a noise and therefore adversely affects a surrounding environment. 
         [0004]    Additionally, it has been proposed a hair removal device of so-called a heat generator which cauterizes a skin hair grown on a skin by use of a wire or a ribbon heated at high temperature adjacent to the skin. The heat generator is capable of removing skin hair without generating a noise. The heat generator provides a heat pulse with respect to the wire or the ribbon which serves as a heating element. Thus, an average temperature can be lowered even if the temperature has been once raised at a moment. As a result, the heat generator has an advantage that a damage due to a heat is not imparted to the skin. 
       SUMMARY 
       [0005]    However, in the above mentioned conventional hair removal device, there is a case where it takes a lone: time to remove skin hair by cauterization because the heating element is a wire or a ribbon for applying heat for skin hair removal. For example, the wire or the ribbon has a heat resistance so that it sometimes takes a long time for a temperature of the wire or the ribbon to reach a temperature at which the skin hair can be cauterized. Additionally, in the above mentioned conventional hair removal device, a speed for cauterization varies depending on a thickness of hair so that tips of hairs after cauterization may be unevenly aligned. Furthermore, in case the wire or the ribbon is employed, a disadvantage may be caused that a power consumption is increased. 
         [0006]    The embodiment is made in light of the above mentioned circumstances, and an object of the embodiment is therefore to provide a laser depilatory device that can utilize a rectilinear and convergent characteristics of laser light to evenly align tips of hairs after cauterization without adversely affecting a human skin due to a direct heat application. Thus, the embodiment can achieve a hair removal in an efficient manner with saving power consumption. 
         [0007]    In order to achieve the above object, according to an aspect of the embodiment, there is provided a laser depilatory device comprising: a housing including a contacting surface to which a skin surface is contacted and a recessed portion formed on the contacting surface; a laser light generating section disposed in the housing for generating laser light; and a first hole portion formed on an inner wall surface of the recessed portion for emitting the laser light through a space inside the recessed portion towards the inner wall. 
         [0008]    According to another aspect of the embodiment, the laser depilatory device may include a second hole portion formed on an inner wall surface of the recessed portion for emitting the laser light through a space inside the recessed portion towards the inner wall in a direction different from a direction of the laser light emitted from the first hole portion. 
         [0009]    According to yet another aspect of the embodiment, the laser depilatory device may include a tubular laser light deriving section connected to the laser light generating section and the first hole portion for transmitting the laser light generated by the laser light generating section to the first hole portion. 
         [0010]    According to yet another aspect of the embodiment, the first hole portion may be arranged in a straight line along the contacting surface. With this configuration, the laser depilatory device according to the embodiment enables skin hair guided inside the recessed portion to be simultaneously and yet efficiently cauterized along the contacting surface. 
         [0011]    According to yet another aspect of the embodiment, the laser depilatory device includes a slit opposing the first hole portion. With this configuration, a user can utilize the slit as a guide when a body of the laser depilatory device is moved along the user&#39;s skin. As a result, the laser depilatory device can guide skin hair inside the recessed portion. Furthermore, the slit allows the skin hair to be raised or groomed. Accordingly, the skin hair can be cut to be aligned at the prescribed height along the contacting surface. 
         [0012]    According to yet another aspect of the embodiment, the laser depilatory device includes a heating element arranged substantially in parallel with the first hole portion, a part of which being arranged in contact with the skin surface, for absorbing the laser light emitted from the first hole portion to generate heat. The heating element converts light energy to heat energy to be heated to high temperature. The heat generation of the heating element allows a pore of the skin to open so that a removal function can be improved. Since the heating element is heated with the laser light, the heating element is free from unnecessary power consumption required for the pore of the skin being opened. Furthermore, the heating element absorbs light, therefore it can be prevented that emitted laser light enters into the user&#39;s eye. 
         [0013]    According to yet another aspect of the embodiment, the laser depilatory device may include a detecting section for detecting the contacting surface being moved towards a direction of the laser irradiated from the first hole portion with respect to the skin surface; and a controller for turning on/off an irradiation of the laser light based on a detection by the detecting section. With this configuration, the laser light is automatically irradiated only when a user carries forward the laser depilatory device for hair removal on the user&#39;s skin. On the other hand, an irradiation of the laser light automatically stops when the user stops the laser depilatory device to move or carries backward the laser depilatory device. As a result, a power loss can be suppressed due to a constant irradiation of the laser light. 
         [0014]    According to the embodiment, the tips of skin hairs can be trimmed evenly after cauterization, while preventing the direct adverse influent of heat on the human skin. Furthermore, according to the embodiment, the skin hair can be removed effectively with lower power consumption. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]      FIG. 1  is a perspective view showing a laser depilatory device according to the first embodiment. 
           [0016]      FIG. 2  is a partially fractured front elevational view showing an outline of an inner equipment of the laser depilatory device according to the first embodiment. 
           [0017]      FIG. 3  is a perspective view showing the modification to the first embodiment. 
           [0018]      FIG. 4  is a partially fractured front elevational view showing an outline of an inner equipment of the laser depilatory device according to the second embodiment. 
           [0019]      FIG. 5  is a perspective view showing the modification to the laser depilatory device. 
           [0020]      FIG. 6  is a perspective view showing another modification to the laser depilatory device. 
           [0021]      FIG. 7  is a plan view showing yet another modification to the laser depilatory device. 
           [0022]      FIG. 8  is a plan view showing yet another modification to the laser depilatory device. 
       
    
    
     DETAILED DESCRIPTION 
       [0023]    Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. 
       First Embodiment 
       [0024]    Referring to  FIGS. 1 and 2 , a laser depilatory device  100  according to the first embodiment comprises a housing  1 , a laser light outlet  2  and a heating element  3 . The laser depilatory device  100  is capable of cauterizing skin hair with laser light. By use of the laser light, removing skin hair with lower power consumption can be achieved in comparison to the conventional hair removal device that heats a wire or a ribbon. 
         [0025]    The housing  1  has cuboid shape which is surrounded by wall sections  5   a,    5   b,    5   c  and  5   d  as a whole. A recessed portion  4  is formed at one end surface of the housing  1  which contacts wall sections  5   a,    5   b,    5   c  and  5   d,  respectively, in an approximately center region of the end surface. The recessed portion  4  is defined by inner walls of the wall sections  5   a    5   b,    5   c  and  5   d,  and has a prescribed depth. 
         [0026]    The end surface of the housing  1  (i.e., end portions of the wall sections  5   a  to  5   d ), at which the recessed portion  4  is formed, is capable of contacting (i.e., abutting) human skin, such as a skin of a face, or legs and arms, as described hereinafter, and constitutes a smooth surface (i.e., a contacting surface) P. 
         [0027]    At rim portions of an opposing pair of wall sections  5   a  and  5   b  which constitutes the recessed portion  4 , a plurality of slits  6  and  7  are arranged, respectively (nine slits in an illustrative example shown in  FIG. 1 ), at an equal interval along the respective rim portions of the recessed portion  4 . The slits  6  and  7  communicate between an inner wall of the recessed portion  4  and an outer wall of the housing  1 . The slits  6  and  7  have the same shape and the same dimension with respect to one another. Yet concerning the slits  6  and  7 , corresponding slits are positioned at opposing positions each other. As a result, the slits  6  and  7  allow the device to form a plurality of protruding portions  8 ,  9  each of which has the same shape and the same dimension one another at wall sections  5   a  and  5   b,  respectively. The heating element  3  are disposed at each of protruding portions  8  of the wall section  5   a,  the protruding portions  8  sandwiching the slit  6 . 
         [0028]    The slits  6  and  7  function as a guide which raises or grooms skin hair subject to the cauterization to guide into the recessed portion  4 . 
         [0029]    A plurality of laser light outlets  2  are provided, respectively, at an inner side surface of the protruding portions  9  of the wall section  5   b  which sandwich the slit  7  (i.e., an inner wall surface of the recessed portion  4  opposing the protruding portion  8 ). The laser light outlets  2 , as a whole, are aligned in a straight line along the contacting surface P of the rim portion of the wall section  5   b.    
         [0030]    The laser light outlet  2  is a bore which is arranged for emitting laser light towards heating elements  3  disposed at protruding portions  8 . The laser light emitted from the laser light outlet  2  arranged on the inner side surface of each of the protruding portion  9  (as shown with an arrow R in  FIG. 1 ) is irradiated to the heating element  3  arranged on the inner side surface of each of the protruding portions  8  which corresponds to each of the protruding portions  9 . A collective lens may be arranged at the laser light outlet  2 . Arranging the collective lens allows the laser light to be effectively irradiated to the heating element  3 . 
         [0031]    The heating element  3  is arranged such that the heating elements  3  are arranged in series on the inner wall surface of the recessed portion  4  (i.e., the surface opposing to the protruding portion  9 ) from a part of an upper surface of the protruding portion  8  (i.e., the contacting surface P). The heating elements  3  are mounted such that the heating elements  3 , as a whole, have the same width as the protruding portions  8  and the cross sections thereof have inverted L-shape. The heating element  3  is adhered to the upper surface and the inner side surface of the protruding portion  8 . The heating element  3  may be integrally disposed with the housing f when the housing  1  is molded. 
         [0032]    In case infrared laser is employed as laser light emitted from the laser light outlet  2 , the heating element  3  is composed of infrared absorption material, in this case, the heating element  3  is realized by the process that liquid infrared absorption material be applied to the protruding portion  8 , or alternatively, sheet-shaped or film-shaped infrared absorption material be pasted on the protruding portion  8 . 
         [0033]    As shown in  FIG. 2 , the laser depilatory device  100  according to the first embodiment, in addition to the above described laser light outlets  2  and the heating element  3 , a laser light generating section  11 , a detecting section  12 , a battery  13 , a power switch  14 , a power receiving connector  15 , an AC/DC converting section  16  and a controller  17 , all of which are in the housing  1 . 
         [0034]    The laser light generating section  11  is a device that generates laser light with higher directivity and higher convergence. The laser light generating section  11  is, for example, a pulse laser device with small-diameter, and generates laser light with prescribed wavelength by way of prescribed oscillation method. Solid-state laser, gas laser or semiconductor laser may be employed as a light source of the laser light generating section  11 . The output level of the laser light generating section  11  is regulated to a level capable of cauterizing skin hair of human in a small amount of time. The laser light generating section  11  is capable of emitting laser light that can cauterize skin hair upon supply of power. In other words, according to the laser light generating section  11 , an amount of time required for cauterizing skin hair can be shortened in comparison to the conventional cauterization with the wire or the ribbon. The laser light generating section  11  is connected to the laser light outlet  2  through light deriving tube  11 A which is light guiding elements. 
         [0035]    The light deriving tube  11 A is a transmission channel of laser light. The light deriving tube  11 A derives the laser light generated by the laser light generating section  11  to the laser light outlet  2 . The light deriving tube  11 A, for example, is made of an optical fiber and has a multi-layered structure. In other words, the laser light generated by the laser light generating section  11  is derived to the laser light outlet  2  with repetitive reflection within the light deriving tube  11 A. The laser light derived to the laser light outlet  2  is then irradiated onto the heating elements  3 . It should be noted that, although not shown, a light branching filter may be incorporated in the housing  1 . The light branching filter branches the laser light venerated by the laser light generating section  11  into a prescribed number of rays of laser light. The branched rays of laser light are emitted from respective laser light outlets  2  through respective light deriving tubes  11 A. 
         [0036]    The detecting section  12  is a sensor that detects that, electrically, electrostatically or optically, the skin of human be getting adjacent or in contact. The detecting section  12  detects that the contacting surface P of the housing  1  contacts or gets adjacent to the skin of human. 
         [0037]    The detecting section  12  is employed for controlling the turn on/off of an irradiation of the laser light onto the heating element  3 . For example, user pushes the contacting surface P of the housing  1  against his/her skin so that the detecting section  12  detects a contact with the skin (or an approximation being about to contact the skin). As a result, the laser light generating section  11  generates the laser light. Then, the laser light generated is irradiated onto the heating element  3 . When the contacting surface P of the housing  1  is disengaged from the skin, the laser light generating section  11  halts its driving. Consequently, the irradiation of the laser light onto the heating element  3  also halts. 
         [0038]    The power switch  14  turns on/off the power supply to the laser light generating unit  11 . Alternatively, a function of the power switch  14  may he provided with the detecting section  12 . In this case, the power switch  134  may he omitted. In other words, the detecting section  12  detects a contact with or an approximation to the skin of human so that the power supply to the laser light generating section  11  may he turned on/off. 
         [0039]    An AC plug  18  to which an AC code  19  is connected is plugged into the power receiving connector  15 . When the AC plug  18  is plugged into the power receiving connector  15 , the AC/DC converting section  16  converts alternating-current power into direct-current power. Then, the converted direct-current power is supplied to the controller  17 . 
         [0040]    The controller  17  selects either one of the direct-current power supplied from the AC/DC converting section  16  and the direct-current power output from the battery  13 . The controller  17  then supplies the selected direct-current power to the laser light generating section  11 . 
         [0041]    It should be noted that the controller  17  cutouts the power supply from the battery  13  when the power switch  14  is turned on and the AC plug  18  is plugged into the power receiving connector  15 . In other words, the controller  17  supplies to the laser light generating section  11  the direct-current power input through the AC/DC converting section  16 . The controller  17  supplies to the laser light generating section  11  the power of the battery  13  when the power switch  14  is turned on and the AC plug  18  is not plugged into the power receiving connector  15 . 
         [0042]    The controller  17  controls the turn on/off of the driving of the laser light generating section  11  based on a detection signal from the detection section  12 . The “detection signal from the detection section  12 ” is a signal that is output in response to the event that the detection section  12  detects, e.g., the contacting surface P of the housing  1  being in contact with or adjacent to the skin of human. 
         [0043]    Next, an operational sequence of the laser depilatory device  100  will be described. First, a user connects to the power receiving connector  15  of the housing  1  the power supply connector  18  to which the power supply code  19  is connected. Subsequently, the power switch  14  is turned on. With the power switch  14  being turned on, the controller  17  supplies to the laser light generating section  11  the power supplied through the power supply code  19 , the power supply connector  18 , the power receiving connector  15  and the AC/DC converting section  16 . At this moment, the controller  17  cutouts the power supply from the battery  13  to the laser light generating section  11 . 
         [0044]    When the power switch  14  is turned on and the power receiving connector  15  of the housing  1  is not connected to the power supply connector  18  to which the power supply code  19  is connected, the controller  17  supplies the direct-current power from the battery  13  to the laser light generating section  11 . 
         [0045]    Subsequently, in order to start the removal operation of the skin hair, the user directs the recessed portion  4  of the housing  1  towards the position on the skin on which the skin hair is to be removed. Further, the user abuts or approximates the contacting surface P of the housing  1  against or to his/her skin. The detection section  12  detects that the contacting surface P he in contact with or adjacent to the skin. Based on the detection thereof, the controller  17  allows the laser light generating section  11  to he driven. Consequently, the laser light is emitted from the respective laser light outlets  2  towards the respective heating elements  3  which oppose the laser light outlets  2 , respectively. 
         [0046]    The housing  1  is moved along the surface of the skin in a sliding manner so that the skin hairs grown on the skin are guided with the slits  6  and  7  to pass through inside the recessed portion  4 . At this moment, the slit  6  or slit  7  allows the skin hairs passing through therein to be raised or groomed. Then the skin hairs are guided into the recessed portion  4  by the slit  6  or the slit  7  and then to be cut to an even length during the later hair removal operation. 
       (Cauterization of Skin Hair) 
       [0047]    The laser light cauterizes the skin hairs which have passed through the slit  6  or the slit  7  and been guided into the recessed portion  4  at a prescribed height. 
         [0048]    When the skin hair is cauterized, the heating element  3  irradiated with the laser light is heated by the laser light emitted from the laser light outlet  2 . The skin is moderately warmed that is adjacent to the skin in contact with the heated heating element  3 . As a result, the pore is made open, and the hair removal can be achieved from closer position with respect to the skin. Additionally, the heating element  3  functions as a light absorbing element. In other words, the laser light is not reflected in other direction from the heating element  3 . Accordingly, it can be prevented that the laser light enters into an eye of the user so that the safety can be ensured. 
         [0049]    After the skin hair is removed by the above described operations, the contacting surface P is disengaged from the skin by operating the housing  1 . As a result, the detecting section  2  detects that the housing  1  be distant from the skin. Based on the detection by the detecting section  2 , the controller  17  allows the laser light generating section  11  to halt its driving. This enables the cauterization of the Skin hair with the laser light to halt. 
         [0050]    At this moment, when the user turns off the power switch  14 , the power supply can be halted from the battery  13  or the AC/DC converting section  16  to the laser light generating section  11 . Finally, when the power supply connector  18  is pulled out from the power receiving connector  15 , a sequence of the hair removal operation can be terminated. When the user does not turn off the power switch  14  and gets the contacting surface P to be in contact with or approximate the skin once again, the hair removal operation can be resumed or continued. 
         [0051]    It should be noted that a part of the skin hairs removed by the cauterization is once accumulated within the recessed portion  4 . During or after the hair removal operation, the housing  1  is to be operated such that the recessed portion  4  is directed downwardly. By doing so, the accumulated skin hairs can be easily eliminated from the recessed portion  4 . 
         [0052]    As described above, with the provision of slits  6  and  7  in the laser depilatory device  100 , the slits  6  and  7  serve as a guide to smoothly guide the skin hair into the recessed portion  4  when the housing  1  is moved along the skin. At this moment, the slit  6  or slit  7  allows the skin hair to he raised or groomed. Then, since the laser light is emitted in parallel with the direction of travel of the housing  1 , the skin hair that has passed through the slit  6  or slit  7  can he cauterized such that the skin hair is aligned at the prescribed height over the length in the prescribed direction. 
         [0053]    Within the recessed portion  4 , a part of the skin hair is irradiated with the laser light to be intensively cauterized so that each of skin hairs irradiated with the laser light has a cauterized surface having homogeneous and of uniformed shape. The laser light outlets  2  are linearly arranged (arranged in a straight line) at an equal interval along the rim portion of the recessed portion  4  so that wide range of skin hairs can be irradiated with the laser light. As a result, rapid hair removal treatment can he achieved. 
         [0054]    In the laser depilatory device  100 , the heating element  3  absorbs the laser light emitted from the laser light outlet  2  and then is heated. The heating element  3  generates heat by converting the light energy to the heat energy. Heat generation by the heat element  3  allows a pore of the skin contacting the heat element  3  to open. As a result, the hair removal elect can be improved. 
       Modification to First Embodiment 
       [0055]    Hereinafter, referring to  FIG. 3 , the laser depilation device  200 , the modification to the first embodiment, will be described. In this modification, a roller type detecting section  12 A is employed in place of the detecting section  12  shown in  FIG. 1 . The roller type detecting section  12 A detects that a roller  20  has rotated when the housing  1  is operated manually and the contacting surface P is moved in contact with or adjacent to the skin. The roller type detecting section  12 A outputs to the controller  17  a signal indicating that the roller  20  has rotated (hereinafter referred to as “rotation detecting information”). In response to the reception of the rotation detecting information, the controller  17  controls the turn on/off of driving the laser light generating section  11 . Since the turn on/off of an driving of the laser light generating section  11  is controlled based on the detection of the rotation detection information, the laser light is not to be emitted unless the housing  1  is in contact with or adjacent to the skin and then moved. This prevents the laser light from being emitted unnecessarily. As a result, the power consumption required for generating the laser light can be suppressed. 
         [0056]    Preferably, the roller type detecting section  12 A may output the rotation detecting information to the controller  17  only when the roller  20  has rotated in the specified direction. For example, the roller type detecting section  12 A outputs the rotation detecting information to the controller  17  only when the housing  1  is moved towards the direction of emission of the laser light emitted from the laser light outlet  2  (the direction indicated with the arrow in  FIG. 3 ). 
         [0057]    In this manner, the roller type detecting section  12 A outputs the rotating detection information to the controller  17  only when the roller  20  has rotated in one direction so that the laser light can be automatically emitted when, for example, the housing  1  is moved forward in the direction of emission of the laser light on the skin. In contrast, the emission of the laser light can be automatically halted when the housing  1  is stopped from moving or is moved backward. 
         [0058]    Without provision of the roller type detecting section  12 A, when the housing  1  is moved hack and forth, the laser light is emitted in response to the back and forth movement of the housing  1 . Accordingly, the laser light may be irradiated repetitively onto the same skin hair more than necessary. As a result, it may be occurred that length of remaining skin hairs are uneven after the cauterization with the laser light or the keratin of the skin is damaged. In contrast, with provision of the roller type detecting section  12 A, it can be prevented that the laser light be irradiated repetitively onto the same skin hair more than necessary. Also, it can be prevented that the keratin of the skin he damaged. Furthermore, with provision of the roller type detecting section  12 A, the power consumption with continuous emission of the laser light can be suppressed. 
       Second Embodiment 
       [0059]    Hereinafter, referring to  FIG. 4 , the laser depilation device  300 , the second embodiment, will be described. In the description hereinafter, the same element as the laser depilation device  100  according to the first embodiment is denoted by the same reference sign and duplicative description will be omitted. 
         [0060]    The laser depilation device  300  according to the second embodiment is provided with a half mirror  21  at an aperture portion of the laser light outlet  2 . Two mirrors  22  with the prescribed dimension and the prescribed shape are arranged at an equal interval at the wall section  5   b  in the direction of the aperture portion of the recessed portion  4  from the half mirror  21 . 
         [0061]    As such, two mirrors  23  are arranged at an equal interval at the wall section  5   a  in the direction of bottom portion of the recessed portion  4  from the heating element  3 . The half mirror  21 , the mirrors  22  and  23  are arranged such that the half mirror  21 , the mirrors  22  and  23  are positioned in the optic axis of the laser light traveling forward with transmitting or reflecting thereamong. 
         [0062]    With provision of the half mirror  21 , it can be prevented that, when the laser light emitted from the laser light outlet  2  is reflected towards the laser light outlet  2  by the mirror  23 , the reflected laser light is unintentionally entered into the laser light outlet  2 . 
         [0063]    The laser light emitted from the laser light outlet  2  first passes through the half mirror  21 . Subsequently, the laser light is reflected by the mirror  23  at the lowermost part provided at the protruding portion  8 . Yet subsequently, the laser light is reflected by the minor  22  at an upper part provided at the protruding portion  9 . Yet subsequently, the laser light is reflected by the other mirror  23  provided at the protruding portion  8 . Ultimately, the laser light is irradiated onto the heating element  3  provided at the protruding portion  8 . 
         [0064]    The skin hairs that are guided by either the slit  6  or the slit  7  to be introduced into the recessed portion  4  are cauterized by the laser light which is repetitively reflected by the minors  22  and  23 . In this laser depilatory device  300 , the skin hairs are cauterized at five points in the direction of the travel of the laser light on a light path. As a result, the hair removal can be achieved in more efficient manner. As described above, it is particularly efficient when the energy of the laser light generated by the laser light generations section  11  to employ a configuration where the laser light is reflected by, e.g., the mirrors  22  and  23 . 
         [0065]    As described above, the first and second embodiments and the modification to the first embodiment has been described. However, it is not limited to the above described embodiments. In other words, the various modifications can be applied to the embodiment. Hereinafter, the first to third modifications to the embodiment will be described. 
       First Modification 
       [0066]    For example, a laser diode (LD) can be directly disposed at the laser light outlet  2 . The LD and the laser light generation section  11  are electrically connected and the laser light is irradiated onto the heating element  3 . With employing this configuration, the light deriving tube  11 A can be omitted. As a result, manufacturing cost of the laser depilatory device  100  or the like can be reduced. 
       Second Modification 
       [0067]    As shown in  FIGS. 5 and 6 , the layout position of the laser light outlet  2  can be modified appropriately. For example, the laser light outlet  2  can be disposed at the wall section  5   d,  instead of the wall section  5   b  as shown in  FIG. 5 . With employing this configuration, the laser light is irradiated onto the skin hair from the direction orthogonal to the above described direction of the travel of the housing  1  (i.e., the moving direction of the skin hair). It should be noted that in this case the heating element  3  is arranged at the wall section  5   c.  Needless to say, the laser light outlet  2  can be disposed at the wall section  5   c.  in this case, the heating element  3  is arranged at the wall section  5   d.    
         [0068]    As shown in  FIG. 6 , the laser light outlet  2  can be disposed at the wall sections  5   b  and  5   d.  In this case, the rays of laser light emit orthogonally each other. In other words, the hair removal treatment can be carried out by both the laser light RB which is emitted from the laser light outlet  2  disposed at the wall section  5   b  and the laser light RA which is emitted from the laser light outlet  2  disposed at the wall section  5   d  and orthogonal to the emitting direction of the laser light RB. Accordingly, the chance where the skin hairs are irradiated with the laser light is enhanced because the laser light outlet  2  is disposed not only at the wall section  5   b  but also further at the wall section  5   d.  Accordingly, the skin hairs can be cauterized in more efficient manner. Preferably, the layout positions of the laser light outlets  2  at the wall sections  5   b  and  5   d  are different each other in order to prevent the laser light RA and RB interfere (for example, the laser light outlet  2  at the wall section  5   d  is to be disposed at lower position of the recessed portion  4  in  FIG. 6 , in comparison with the laser light outlet  2  at the wall section  5   b ). 
         [0069]    Yet another modification regarding the layout position of the laser light outlet  2  in  FIG. 5  or  6 . The laser light outlet  2 , in addition to the wall section  5   d,  can be disposed at the wall section  5   c  opposing the wall section  5   d.  In this case, preferably, the laser light outlets  2  are disposed at the wall sections  5   c  and the  5   d  alternatively. Hereinafter, the term “disposed alternatively” means that the laser light outlet  2  is not disposed in the region of one wall section (for example, the wall section  5   d ) corresponding to the layout position of the laser light outlet  2  at the other wall section (for example, wall section  5   c ) in order to prevent the rays of laser light R emitted from the opposing laser light outlets  2  from conflicting each other. In other words, when the laser light outlet  2  is disposed at the wall section  5   c  from which the laser light is emitted from the wall section  5   c  towards the wall section  5   d,  the other laser light outlet  2  is not disposed in the region of the wall section  5   d  to which the laser light R emitted from the laser light outlet  2  reaches. Instead, the laser light outlet  2  from which the laser light R is emitted from the wall section  5   d  towards the wall section  5   c  is disposed in the region of the wall section  5   d  towards which the laser light R emitted from the laser light outlet  2  disposed at the wall section  5   c  does not reach. Needless to say, the configuration of the laser light outlets  2  which are alternatively disposed can be applied to the wall sections  5   a  and  5   b.    
       Third and Fourth Modifications 
       [0070]    The shape of the wall sections  5   a.  to  5   d  and the emitting direction of the laser light can be modified appropriately, as the laser depilatory devices  400  and  500  shown in the  FIGS. 7 and 8 . 
         [0071]    Hereinafter, referring to  FIGS. 7 and 8 , the third and fourth modifications where the shape of the wall sections  5   a  to  5   d  and the emitting direction of the laser light are modified will be described. 
         [0072]    First, referring to  FIG. 7 , the laser depilatory device  400 , which is the third modification, will be described.  FIG. 7  is the view showing the laser depilatory device  400  viewed from straight above thereof. As shown in  FIG. 7 , in the laser depilatory device  400 , a part of the wail sections  5   a  to  5   d  is formed in an arch-like shape. More particularly, the opposing surfaces of the wall sections  5   a  to  5   d  are formed such that the opposing surfaces are convex in an arch shape towards the direction of the corresponding wall sections  5   a  to  5   d , respectively. 
         [0073]    The light deriving tube  11 A is disposed such that the end section thereof from which the laser light RA and RB are derived is along with the shape of the wall sections  5   a  to  5   d.  As a result, the rays of the laser light derived by the light deriving tube  11 A (RA and RB in the Figs.) are emitted in the different direction each other towards the heating element  3  disposed at either one of opposing wall sections  5   a  to  5   d.  Accordingly, the rays of laser light RA and RB are emitted to spread in a fan-like shape as a whole, it should be noted that in the laser depilatory device  400 , as described in the modification to the laser device  100  shown in the  FIG. 6 , preferably, the layout position of the laser light outlets  2  is different each other at the wall section  5   b  and the wall section  5   d,  in order to prevent the rays of laser light RA and RB to interfere each other. 
         [0074]    According to the laser depilatory device  400 , since a part of the wall sections  5   a  to  5   d  is formed in an arch-like shape, the area of the contacting surface P is increased. As a result, the area for contacting the skin surface is increased. Consequently, when the skin hair is to be removed, the stability of the laser depilatory device  400  with respect to the skin surface can be increased. 
         [0075]    Next, referring to  FIG. 8 , the laser depilatory device  500 , which is the fourth modification, will be described.  FIG. 8  is a view Showing the laser depilatory device  500  viewed from straight above thereof As shown in  FIG. 8 , in the laser depilatory device  500 , a part of the wall sections  5   a  to  5   d  is formed in an arch-like shape. More particularly, the opposing surfaces of the wall sections  5   a  to  5   d  are formed such that the opposing surfaces are concave in an arch-like shape in the direction of the corresponding wall sections  5   a  to  5   d,  respectively. As a result, the recessed portion  4  is formed in a substantially circular shape (in an elliptical shape in  FIG. 8 ) as a whole. 
         [0076]    The light deriving tube  11 A is disposed such that the end section thereof from which the laser light R is derived is along with the shape of the wall sections  5   a  to  5   d.  The laser light R derived by the light deriving tube  11 A is emitted towards the heating element  3  disposed at either one of opposing wail sections  5   a  to  5   d.  At this moment, the laser light R passes through the center part of the recessed portion  4 . 
         [0077]    In the laser depilatory device  500 , as configured in this way, the derived laser light R passes through the center part of the recessed portion  4 , as described above. Accordingly, the rays of laser light are synthesized in the center part of the recessed portion  4  at which the rays of laser light are concentrated to indicate a high energy state. Also, the interval between the rays of laser light becomes densely. As a result, an output of the laser light generated by the laser light generating section  11  can be set lower than the other embodiments. Consequently, the hair removal in the center part of the aperture can be carried out more strongly, while the safety is ensured.