Abstract:
Provided is a vehicular headlamp including a lamp casing configured by a lamp housing having an opening at least at one side thereof and a cover that covers the opening of the lamp housing, and a lamp unit disposed within the lamp casing. The lamp unit includes: a light source unit having a light source; a movable shade configured to be rotatable and change the shielding quantity of light; a solenoid having an output shaft which moves in a left-and-right direction and configured to rotate the movable shade; a rotation shaft configured to function as a rotation fulcrum of the movable shade, the axial direction of the shaft corresponding to the left and right direction; and an orthogonal transformation mechanism configured to convert a movement action of the output shaft to a rotation movement of the movable shade.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority from Japanese Patent Application No. 2012-219513 filed on Oct. 1, 2012 with the Japan Patent Office and the disclosure of which is incorporated herein in its entirety by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a vehicular headlamp. Specifically, the present disclosure relates to a technology in which at least a portion of a rotation shaft is disposed at an upper side of a solenoid, thereby reducing the size of the vehicular headlamp in the front and rear direction. 
     BACKGROUND 
     A vehicular headlamp known in the art is provided with a lamp unit which includes, for example, a light source disposed within a lamp casing configured by, for example, a cover and a lamp housing. 
     In the lamp unit of the vehicular headlamp, a light quantity control mechanism configured to control a light quantity emitted from the light source is provided and the light quantity control mechanism includes a movable shade configured to change the shielding quantity of the light emitted from the light source and a solenoid configured to operate the movable shade. See, e.g., FIG. 4 of Japanese Patent Laid-Open Publication No. 2007-213938. 
     In the vehicular headlamp disclosed in Japanese Patent Laid-Open Publication No. 2007-213938, an output shaft of the solenoid disposed in front of the solenoid and the movable shade disposed behind the solenoid are connected with each other by a wire type arm and the movable shade is configured to be rotatable on a rotation shaft extending to the left and the right as a fulcrum. When the output shaft of the solenoid moves in the left and right direction, the arm is rotated and the movable shade turns on the rotation shaft as a fulcrum with the rotation of the arm. 
     When the movable shade turns to a first position, the irradiation mode is switched into a low beam irradiation mode that irradiates a short distance. When the movable shade turns to a second position, the irradiation mode is switched into a high beam irradiation mode that irradiates a long distance. 
     In the vehicular headlamp disclosed in Japanese Patent Laid-Open Publication No. 2007-213938, the output shaft of the solenoid is disposed to be movable in the left and right direction and the rotation shaft of the movable shade is also disposed such that the axial direction of the rotation shaft corresponds to the left and right direction. Thus, the size of the vehicular headlamp may be reduced in the front and rear direction. 
     SUMMARY 
     In the vehicular headlamp disclosed in Japanese Patent Laid-Open Publication No. 2007-213938, since the solenoid and the movable shade are connected with each other by the arm, and the solenoid and the movable shade are positioned to be spaced apart from each other in the front and rear direction, a solenoid disposition space and a movable shade disposition are individually required in the front and rear direction. Therefore, it is difficult to say that the size in the front and rear direction is sufficiently reduced. 
     Thus, an aspect of the present disclosure is to provide a vehicular headlamp which may overcome the above-described problem so as to reduce the size in the front and rear direction. 
     According to an aspect of the present disclosure, provided is a vehicular headlamp including a lamp unit disposed within a lamp casing that is configured by a lamp housing having an opening at least at one side thereof and a cover that covers the opening of the lamp housing. The lamp unit includes: a light source unit having a light source; a movable shade configured to be rotatable and change the shielding quantity of light projected from the light source; a solenoid having an output shaft which moves in a left and right direction and configured to rotate the movable shade; a rotation shaft configured to function as a rotation fulcrum of the movable shade, the axial direction of the shaft corresponding to the left and right direction; and an orthogonal transformation mechanism configured to convert a movement action of the output shaft to a rotation action of the movable shade. At least a portion of the rotation shaft is positioned above the solenoid. 
     Therefore, in the vehicular headlamp, a space for disposing at least a portion of the rotation shaft and a space for disposing the solenoid are positioned vertically. 
     The vehicular headlamp of the present disclosure includes a lamp casing configured by a lamp housing having an opening at least at one side and a cover that covers the opening of the lamp housing, and a lamp unit disposed within the lamp casing. The lamp unit includes: a light source unit having a light source; a movable shade configured to be rotatable and change the shielding quantity of light emitted from the light source; a solenoid having an output shaft which moves in a left and right direction and configured to rotate the movable shade; a rotation shaft configured to function as a rotation fulcrum of the movable shade, the axial direction of the shaft corresponding to the left and right direction; and an orthogonal transformation mechanism configured to convert a movement action of the output shaft to a rotation action of the movable shade. At least a portion of the rotation shaft is positioned above the solenoid. 
     Therefore, since the rotation shaft and the output shaft are disposed in a direction extending in the left and right direction and then the rotation shaft is positioned above the solenoid, it is not required to provide a space for disposing the solenoid and a space for disposing the movable shade separately in the front and rear direction. As a result, the size in the front and rear direction may be sufficiently reduced. 
     According to an exemplary embodiment, the vehicular headlamp further includes a support plate configured to support the rotation shaft, in which the solenoid is provided with a yoke case, and the support plate is attached to the yoke case. 
     Therefore, a dedicated member such as, for example, a bracket configured to attach the support plate becomes unnecessary. Thus, the manufacturing costs may be reduced by reducing the number of components and simplifying the mechanism. 
     According to another exemplary embodiment, the vehicular headlamp further includes a support plate configured to support the rotation shaft, in which the solenoid is provided with a yoke case, and the support plate is integrally formed with the yoke case. 
     Therefore, a process of attaching the support plate to the yoke case becomes unnecessary and the number of components and the manufacturing costs may be reduced. 
     According to still another exemplary embodiment, the orthogonal transformation mechanism includes: a rotation link which is rotated by the movement of the output shaft; a first connecting pin configured to connect the output shaft and the rotation link; and a second connecting pin configured to connect the movable shade and the rotation link. The first connecting pin is inserted into the output shaft and the rotation link so that the output shaft and the rotation link are connected with each other and the second connecting pin is inserted into the movable shade and the rotation link so that the movable shade and the rotation link are connected with each other. 
     Therefore, a process of connecting the rotation link with the output shaft and the movable shade may be facilitated and the workability may be improved. 
     According to yet another exemplary embodiment, within a rotation range of the rotation link, the second connecting pin is positioned between a rotation fulcrum of the rotation link and the first connecting pin. 
     Therefore, the rotation space of the rotation link may be formed in a small size and thus, size in the front and rear direction may be reduced. 
     According to yet another exemplary embodiment, the top surface portion and the bottom surface portion of the yoke case are provided as attachment surface portions, respectively, to which the support plate is selectively attached. 
     Therefore, the support plate may be selectively attached to the top surface and the bottom surface for use in the left vehicular lamp and the right vehicular lamp of the right side so as to use the same solenoid. As a result, the number of components and the manufacturing costs may be reduced due to the improvement of versatility. 
     The above-described summary is illustration purposes only and does not intend to limit in any ways. In addition to the illustrative embodiment, examples, and features described above, additional embodiment, example, and features will become apparent by referring to the drawings and the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a longitudinal sectional view schematically illustrating an exemplary embodiment of a vehicular headlamp of the present disclosure. 
         FIG. 2  is an exploded perspective view of a light quantity control mechanism. 
         FIG. 3  is a perspective view illustrating a state in which a movable shade is maintained at a first position. 
         FIG. 4  is a perspective view illustrating a state in which a movable shade is maintained at a second position. 
         FIG. 5  is a perspective view illustrating an example in which a solenoid is reversely used. 
         FIG. 6  is a perspective view illustrating an example in which a support plate is integrally formed in a yoke case. 
         FIG. 7  is an enlarged schematic plan view illustrating a positional relationship of a fulcrum shaft and each connecting pin within a rotation range of a rotation link. 
         FIG. 8  is an exploded perspective view of a light quantity control mechanism according to a modified example. 
         FIG. 9  is a perspective view illustrating a state in which a movable shade of a light quantity control mechanism according to the modified example is maintained at a second position. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, reference is made to the accompanying drawings which form a part hereof. The illustrative embodiments described in the detailed descriptions, drawings, and claims do not intend to limit. Other embodiments may be utilized and other modified examples may be made without departing from the spirit or scope of the subject matter presented here. 
     Hereafter, detailed description for an exemplary embodiment of a vehicular headlamp according to the present disclosure will be described with reference to drawings. 
     Each vehicular headlamp  1  is disposed at and attached to one of left and right ends of the front end of a vehicle. 
     The vehicular headlamp  1  includes a lamp housing  2  having an opened concave portion at the front side and a cover  3  that covers the opening of the lamp housing  2  (see, e.g.,  FIG. 1 ). A lamp casing  4  is configured by the lamp housing  2  and the cover  3 , and the inner space of the lamp casing  4  is formed as a lamp chamber  5 . 
     At the rear end of the lamp housing  2 , an attachment hole  2   a  penetrated in the front and rear direction is formed. A back cover  6  is attached to the attachment hole  2   a.    
     A lamp unit  7  is disposed within the lamp chamber  5 . The lamp unit  7  includes a lens holder  8 , a projection lens  9  attached to the front end of the lens holder  8 , a reflector  10  configured to reflect light, a light source unit  11  disposed under the reflector  10 , and a cooling fan  12  attached to the bottom surface of the light source unit  11 . 
     The lens holder  8  includes a lens attachment portion  13  which is substantially in an annular shape and penetrated in the front and rear direction, lateral portions  14 ,  14 , . . . protruding rearward from the left and right ends of the lens attachment portion  13 , respectively, and a holding unit  15  provided between the lateral portions  14 ,  14 , . . . disposed at the left and right sides. 
     The lateral portions  14 ,  14 , . . . are each formed in a plate shape facing substantially in the left and right direction. 
     The holding unit  15  includes a solenoid attachment portion  16  disposed at the front side and an attachment surface portion  17  disposed at the rear side of the solenoid attachment portion  16 . 
     The projection lens  9  is formed in a substantially hemisphere shape and attached to the lens attachment portion  13  of the lens holder  8 . 
     The inner surface of the reflector  10  is formed as a reflecting surface  10   a . The reflector  10  is attached to the top surface of the light source unit  11 . 
     The light source unit  11  includes a circuit board  18  and a light source  19  mounted on the top surface of the circuit board  18 . As the light source  19 , for example, a light emitting diode (LED) is used. The light source unit  11  is provided with a heat sink  20  disposed below the circuit board  18 . A cooling fan  12  is disposed inside of the heat sink  20 . 
     The light source unit  11  is attached to the attachment surface portion  17  of the lens holder  8 . 
     A light quantity control mechanism  21  is attached to the lens holder  8 . 
     The light quantity control mechanism  21  includes a movable shade  22 , a support plate  23 , a rotation shaft  24 , a solenoid  25 , and an orthogonal transformation mechanism  26  (see, e.g.,  FIGS. 2 and 3 ). 
     The movable shade  22  includes a light quantity control portion  27  which is formed in a substantially circular arc surface shape, protrusions  28 ,  28  protruding from the left and right ends of the light quantity control portion  27  to the outer sides (lateral sides), respectively, and a stopper portion  29  protruding rearward from the light quantity control portion  27 . At the front surface side of the lower end portion of the light quantity control portion  27 , a spring tray portion  27   a  is formed. One of the protrusions  28  is formed with a shaft insertion hole  28   a  which is substantially vertically penetrated. 
     The movable shade  22  is rotated on the rotation shaft  24  as a fulcrum between a first position (see, e.g.,  FIG. 3 ) where a part of the light emitted from the light source  19  is shielded and a second position where the shielding quantity becomes less than that of the first position (see, e.g.,  FIG. 4 ). The first position is a low beam position where a short distance is irradiated and the light quantity control portion  27  of the movable shade  22  is in a substantially vertical state. The second position is a high beam position where a long distance is irradiated and the light quantity control portion  27  of the movable shade  22  is in a tilted state. 
     The support plate  23  includes a base surface portion  30  facing the up and down direction, shaft support protrusions  31 ,  31  protruding upward from the left and right ends of the base surface portion  30 , respectively, and a stopper protrusion  32  protruding from the rear end of the base surface portion  30  upward (see, e.g.,  FIG. 2 ). 
     A spring hook portion  30   a  protruding forward and slanting upward is provided at the front end of the base surface portion  30 . The base surface portion  30  is formed with a shaft insertion hole  30   b  at one end in the left and right direction thereof. 
     The axial direction of the rotation shaft  24  corresponds to the left and right direction and the axial opposite ends of the rotation shaft  24  are inserted through the movable shade  22  in the vicinity of the left and right ends of the movable shade  22 . The axial opposite ends of the rotation shaft  24  are positioned at lateral sides (outsides) of the light quantity control portion  27  and the portion other than the opposite ends of the rotation shafts is positioned in front of the light quantity control portion  27 . Fixation rivets  33 ,  33  and fixation rings  34 ,  34  are fixed to the axial opposite ends of the rotation shaft  24 , respectively, and the rotation shaft  24  is fixed to the movable shade  22 . Therefore, the movable shade  22  is rotated on the rotation shaft  24  as a fulcrum integrally with the rotation shaft  24 . 
     The portion of the rotation shafts  24  positioned in front of the light quantity control portion  27  is rotatably supported by the shaft support protrusions  31 ,  31  of the support plate  23 . A compression spring  35  which is a torsional coil spring is fit on and supported by the rotation shaft  24  and both ends of the compression spring  35  are engaged with the spring abutments  27   a  of the movable shade  22  and the spring hook portion  30   a  of the support plate  23 , respectively. Therefore, the movable shade  22  is urged to the direction in which the movable shade  22  is rotated from the second position to the first position by the compression spring  35 . 
     The solenoid  25  includes a yoke case  36 , a coil body  37  disposed within the yoke case  36 , and an output shaft  38  movable in the left and right direction. 
     The yoke case  36  is formed in a frame shape which is penetrated in a rectangular shape in the front and rear direction. 
     The axial direction of the coil body  37  corresponds to the left and right direction, and the axial direction of the output shaft  38  corresponds to the left and right direction so that a portion of the output shaft  38  protrudes laterally from the yoke case  36 . 
     The base surface portion  30  of the support plate  23  is attached to the top surface portion  36   a  of the yoke case  36  by, for example, screw fixation. In a state in which the base surface portion  30  is attached to the top surface portion  36   a , the left and right ends of the base surface portion  30  protrude from the yoke case  36  laterally, respectively. Also, in a state in which the base surface portion  30  is attached to the top surface portion  36   a , the rotation shaft  24  and the movable shade  22  are positioned above the solenoid  25 . 
     The orthogonal transformation mechanism  26  includes a rotation link  39 , a fulcrum shaft  40  which functions as a rotation fulcrum of the rotation link  39 , a first connecting pin  41 , and a second connecting pin  42  in which the first and second connecting pins  41 ,  42  are inserted into the rotation link  39 , respectively. 
     The rotation link  39  is formed in a substantially L shape when viewed from the top. A hole to be supported  39   a  which is vertically penetrated is formed at a curved middle portion, and first and second connecting holes  39   b ,  39   c  which are vertically penetrated are formed at both ends, respectively. The first connecting hole  39   b  is formed in a slot shape which extends substantially to the front and the rear and the second connecting hole  39   b  is formed in a slot shape which extends substantially to the left and the right. 
     The fulcrum shaft  40  is sequentially inserted to the shaft insertion hole  30   b  of the support plate  23  and the hole to be supported  39   a  of the rotation link  39  from the upper side. Therefore, the rotation link  39  is rotated horizontally on the fulcrum shaft  40  as the fulcrum in relation to the support plate  23 . 
     The first connecting pin  41  is inserted into the first connecting hole  39   b  of the rotation link  39  and inserted through and fixed to the output shaft  38  of the solenoid  25 . Therefore, the output shaft  38  and the rotation link  39  are connected with each other by the first connecting pin  41 . The first connecting pin  41  is adapted to be able to move in the first connecting hole  39   b  along the longitudinal direction (substantially in the front and rear direction) of the first connecting hole  39   b  when the rotation link  39  is rotated. 
     The second connecting pin  42  is sequentially inserted into the shaft insertion hole  28   a  of the movable shade  22  and the second connecting hole  39   c  of the rotation link  39  from the upper side. Therefore, the movable shade  22  and the rotation link  39  are connected with each other by the second connecting pin  42 . The second connecting pin  42  is adapted to be able to move in the second connecting hole  39   c  along the longitudinal direction (substantially in the left and right direction) of the second connecting hole  39   c  when the rotation link  39  is rotated. 
     The lamp unit  7  is supported to the housing  2  to be capable of being tilted through an aiming adjustment mechanism (not illustrated). Therefore, by the operation of the aiming adjustment mechanism, the lamp unit  7  is tilted in the up and down direction or in the left and right direction so that optical axis adjustment (initial adjustment) of the light source  19  is performed. 
     Also, for example, the lamp unit  7  may be supported by the lamp housing  2  to be capable of being tilted in the up and down direction. When the lamp unit  7  is supported by the lamp housing  2  to be capable of being tilted in the up and down direction, a leveling adjustment mechanism (not illustrated) is connected to the lamp unit  7  so that the lamp unit  7  is tilted in the up and down direction by the operation of the leveling adjustment mechanism, and the optical axis direction of the light source  19  is adjusted according to the weight of goods loaded on the vehicle. 
     Further, the lamp unit  7  may be rotated, for example, in the horizontal direction. When the lamp unit  7  is adapted to be capable of being rotated in the horizontal direction, a swivel mechanism (not illustrated) is connected to the lamp unit  7  so that the lamp unit  7  is rotated in the horizontal direction by the operation of the swivel mechanism and the optical axis is changed according to the driving direction of the vehicle. 
     In the vehicular headlamp  1  configured as described above, in a state in which a driving current is not supplied to the coil body  37  of the solenoid  25 , the protrusions  28 ,  28  of the movable shade  22  urged by the biasing spring  35  are urged against the base surface portion  30  of the support plates  23  and maintained at the first position (see, e.g.,  FIG. 3 ). At this time, the output shaft  38  of the solenoid  25  is positioned at a moving end in the protruding direction from the yoke case  36 . 
     In the state in which the movable shade  22  is at the first position, when light is emitted from the light source  19 , a part of the light is shielded by the movable shade  22 . The non-shielded light is incident on the projection lens  9  and projected by the projection lens  9 . As a result, a low beam light distribution pattern irradiating a short distance is formed. 
     When the electricity is supplied to the coil body  37  of the solenoid  25 , the output shaft  38  moves in the direction drawn into the yoke case  36  and the rotation link  29  is rotated on the fulcrum shaft  40  as the fulcrum (see, e.g.,  FIG. 4 ). When the rotation link  39  is rotated, the position of the second connecting pin  42  is changed and the movable shade  22  is rotated on the rotation shaft  24  as the fulcrum from the first position to the second position against the biasing force of the biasing spring  35 . The stopper portion  29  of the movable shade  22  is in contact with the stopper protrusion  32  of the support plate  23 , thereby maintaining the movable shade  22  at the second position. 
     When the movable shade  22  is rotated up to the second position, the shielding quantity of the light emitted from the light source  19  is reduced and the high beam light distribution pattern irradiating the long distance is formed. 
     When the electricity supply to the coil body  37  is stopped, the movable shade  22  is rotated on the rotation shaft  24  as the fulcrum from the second position up to the first position by the biasing force of the biasing spring  35 . According to the rotation of the movable shade  22 , the rotation link  39  is rotated and the output shaft  38  is moved to the moving end in the direction protruding from the yoke case  36  (see, e.g.,  FIG. 3 ). 
     Also, the solenoid  25  is provided with a connection portion (not illustrated) where a cable for the electricity supply is connected in which the cable connection portion is provided at the opposite side to the side protruding from the yoke case  36  of the output shaft  38  in the left and right direction. Therefore, by providing both the top surface portion  36   a  and the bottom surface portion  36   b  of the yoke case  36  as the attachment surface portions, as illustrated in  FIG. 5 , the solenoid  25  may be turned upside down so that the capable connection portion may be positioned at the inner side or the outer side together in the left and right direction for use in the vehicular headlamp  1  of left side and the vehicular headlamp  1  of the right side. 
     As described above, by providing both the top surface portion  36   a  and the bottom surface portion  36   b  of the yoke case  36  as the attachment surface portions of the support plates  23 , the support plate  23  may be selectively attached to the top surface portion  36   a  and the bottom surface portion  36   b  and the same solenoid  25  may be used. Therefore, the number of components and the manufacturing costs may be reduced due to the improvement of versatility. 
     Also, in the above description, an example in which the support plate  23  is attached to the yoke case  36  of the solenoid  25  has been described. However, the yoke case  36  and the support plate  23  may be integrally formed (see, e.g.,  FIG. 6 ). When the yoke case  36  and the support plate  23  are integrally formed, a process of attaching the support plate to the yoke case  36  becomes unnecessary and the number of the components and the manufacturing costs may be reduced. 
     Further, in the light quantity control mechanism  21 , with respect to the fulcrum shaft  40  and the first and second connecting pins  41 ,  42  which are individually inserted into the rotation link  38 , the second connecting pin  42  is positioned between the fulcrum shaft  40  and the first connecting pin  41  in the front-rear direction in the rotation ranges R 1 , R 2  of the rotation link  39  (see, e.g.,  FIG. 7 ). 
     Therefore, the rotation space of the rotation link  39  is reduced and thus, the vehicular headlamp  1  may be reduced in size in the front and rear direction of the vehicular headlamp  1 . 
     Moreover, in the light quantity control mechanism  21 , the first connecting pin  41  is inserted into the output shaft  38  and the rotation link  39  so that the output shaft  38  and the rotation link  39  are connected with each other and the second connecting pin  42  is inserted into the movable shade  22  and the rotation link  39  so that the movable shade  22  and the rotation link  39  are connected with each other. 
     Therefore, the process of connecting the rotation link  39  and the output shaft  38  and the movable shade  22  may be facilitated and the workability may be improved. 
     Hereinafter, a modified example of the lens holder and the light quantity control mechanism will be described (see, e.g.,  FIGS. 8 and 9 ). 
     A light quantity control mechanism  51  according to the modified example is attached to the lens holder  8 . 
     The light quantity control mechanism  51  includes a movable shade  52 , a support plate  53 , a rotation shaft  54 , a solenoid  55 , and an orthogonal transformation mechanism  56 . 
     The movable shade  52  includes a light quantity control portion  57  which is formed in a substantially circular arc surface shape, protrusions  58 ,  58  protruding from the left and right ends of the light quantity control portion  57  outward (laterally) respectively, and a stopper portion  59  protruding rearward from the light quantity control portion  57 . 
     The movable shade  52  is rotated on the rotation shaft  54  as a fulcrum between a first position where a part of the light emitted from the light source  19  is shielded and a second position where the shielding quantity becomes less than that of the first position. The first position is a low beam position of where a short distance is irradiated and the light quantity control portion  57  of the movable shade  52  becomes a substantially vertical state. The second position is a high beam position where a long distance is irradiated and the light quantity control portion  57  of the movable shade  52  becomes a tilted state. 
     The support plate  53  includes a base surface portion  60  facing the front and rear direction and shaft support protrusions  61 ,  61  protruding upward from the left and right ends of the base surface portion  60 , respectively. 
     The base surface portion  60  is provided with a spring hook portion  60   a  which protrudes forward. 
     The rotation shaft  54  has an axial direction which corresponds to the left and right direction and penetrates the movable shade  22  at positions in the vicinity of the left and right ends of the movable shade  22 , respectively. The axial opposite ends of the rotation shaft  54  are positioned at lateral sides of the movable shade  52  and the portion in the shaft direction other than the both ends is positioned in front of the light quantity control portion  57  of the movable shade  52 . At a location in the vicinity of one of the axial ends of the rotation shaft  54 , a connecting base  62  is fixed. The connecting base  62  is provided as a connecting portion  62   a  of which the rear end is positioned behind the rotation shaft  54 . At the opposite ends of the shaft direction of the rotation shaft  54 , fixation rivets  63 ,  63  and fixation rings  64 ,  64  are attached, respectively so that the rotation shaft  54  is fixed to the movable shade  52 . Therefore, the movable shade  52  is rotated integrally with the rotation shaft  54  on the rotation shaft  54  as a fulcrum. 
     The portion of the rotation shaft  54  positioned in front of the light quantity control portion  57  is rotatably supported by the shaft support protrusions  61 ,  61  of the support plate  53 . A biasing spring  65  which is a twist coil spring is externally put on the rotation shaft  54  and supported and both ends of the biasing spring  65  are engaged with the spring abutment  57   a  of the movable shade  52  and the spring hook portion  60   a  of the support plate  53 . Therefore, the movable shade  52  is urged to the direction of rotating the movable shade  52  from the second position to the first position by the biasing spring  65 . 
     The solenoid  55  includes a yoke case  66 , a coil body  67  disposed within the yoke case  66 , and an output shaft  68  movable in the left and right direction. 
     The yoke case  66  is formed in a frame shape which is penetrated in a rectangular shape in the front and rear direction. 
     The axial direction of the coil body  67  corresponds to the left and right direction. The output shaft  68  has an axial direction in the left and right direction and partially protrudes laterally from the yoke case  66 . At the protruding portion from the yoke case  66  of the output shaft  68 , a connecting neck portion  68   a  of which the diameter is narrower than that of other portion is formed. 
     A portion of the upper end of the front surface portion  66   a  of the yoke case  66  protrudes laterally. 
     A base surface portion  60  of the support plate  53  is attached to the upper end of the rear surface portion  66   b  of the yoke case  66  by, for example, screw fixation. In the state in which the base surface portion  60  is attached to the rear surface portion  66   b , the left and right ends of the base surface portion  60  protrude from the yoke case  66  laterally. Also, in the state in which the base surface portion  60  is attached to the rear surface portion  66   b , the rotation shaft  54  and the movable shade  52  are positioned at the upper side of the solenoid  55 . 
     The orthogonal transformation mechanism  56  includes a rotation link  69 , a fulcrum shaft  70  that functions as a rotation fulcrum, a pressing member  71  configured to press the fulcrum shaft  70 , and a wire type connecting member  72 . 
     The rotation link  69  is formed with a flat supported portion  73  facing the front and rear direction, a connecting plate portion  74  protruding substantially downwards from the flat supported portion  73 , and an arm portion  75  protruding rearward from the flat supported portion  73 . The flat supported portion  73  is formed with a supported hole  73   a  and the rear end of the arm portion  75  is provided as a connecting portion  75   a.    
     The fulcrum shaft  70  is attached to a portion protruding laterally of the front surface portion  66   a  of the yoke case  66  and provided to protrude rearward. 
     The fulcrum shaft  70  is inserted into the supported hole  73   a  of the rotation link  69  and the rotation link is rotatably supported by the fulcrum shaft  70 . In the state in which the rotation link  69  is supported by the fulcrum shaft  70 , the pressing member  71  is attached to the fulcrum shaft  70  and the rotation link  69  is pressed by the pressing member  71  so that the rotation link  62  is suppressed from releasing from the fulcrum shaft  70 . 
     In the state in which the rotation link  69  is supported by the fulcrum shaft  70 , the connecting plate portion  74  is fit on the connecting neck portion  68   a  formed on the output shaft  68  of the solenoid  55  so that the rotation link  69  is connected to the output shaft  68 . 
     The connecting member  72  is connected to the connecting portion  75   a  provided for the arm portion  75  of the rotation link  69  at one end and connected to the connecting portion  62   a  of the connecting base  62  at the other end. Therefore, the rotation link  69  connected to the output shaft  68  and the connecting base  62  fixed at the rotation shaft  54  are connected with each other via the connecting member  72 . 
     In the vehicular headlamp  1  configured as described above, in a state in which a driving current is not supplied to the coil body  67  of the solenoid  55 , the movable shade  52  urged by the biasing spring  65  is maintained at the first position. At this time, the output shaft  68  of the solenoid  55  is positioned at a moving end in the protruding direction from the yoke case  66 . 
     In the state in which the movable shade  52  is at the first position, when light is emitted from the light source  19 , a part of the light is shielded by the movable shade  52 . The non-shielded light is incident on the projection lens  9  and the light is projected by the projection lens  9 . As a result, a low beam light distribution pattern irradiating a short distance is formed. 
     When the electricity is supplied to the coil body  67  of the solenoid  55 , the output shaft  68  moves in the direction drawn into the yoke case  66  and the rotation link  69  is rotated on the fulcrum shaft  40  as a fulcrum (see, e.g.,  FIG. 8 ). When the rotation link  69  is rotated, the connecting member  72  is moved downwards, the movable shade  52  is rotated on the rotation shaft  24  as the fulcrum from the first position to the second position against the biasing force of the biasing spring  65 . The stopper portion  59  of the movable shade  52  is in contact with a stopper portion (not illustrated), thereby maintaining the movable shade  52  at the second position. 
     When the movable shade  52  is rotated up to the second position, the shielding quantity of the light emitted from the light source  19  is reduced and the high beam light distribution pattern irradiating the long distance is formed. 
     When the electricity supply to the coil body  67  is stopped, the movable shade  52  is rotated on the rotation shaft  54  as a fulcrum from the second position to the first position by the biasing force of the biasing spring  65 . According to the rotation of the movable shade  52 , the rotation link  69  is turned as the movable shade  52  is rotated and the output shaft  68  is moved to the moving end in the direction protruding from the yoke case  66 . 
     As described above, in the vehicular headlamp  1 , since the rotation shafts  24 ,  54  are disposed at the upper side of the solenoids  25 ,  55  after the rotation shafts  24 ,  54  and the output shafts  38 ,  68  are disposed in the direction extending in the left and right direction, it is not required to separately provide the spaces for disposing the solenoids  25 ,  55  and the movable shades  22 ,  52  in the front and rear direction. Therefore, the size in the front and rear direction may be sufficiently reduced. 
     Also, since the support plates  23 ,  53  are attached to the yoke cases  36 ,  66 , a dedicated member such as, for example, a bracket becomes unnecessary. Therefore, the manufacturing costs may be reduced due to the reduction of the number of the components and the simplification of the mechanism. 
     Further, in the light quantity control mechanism  51  according to the modified example, the yoke case  66  and the support plate  53  may be integrally formed as in the light quantity control mechanism  21 . When the yoke case  66  and the support plate  53  are integrally formed, a process of attaching the support plate  53  to the yoke case  66  becomes unnecessary and the number of components and the manufacturing costs may also be reduced. 
     In the above description, a vehicular lamp  1  having reflector  10  has been described as an example. However, the present disclosure may also be applied to a so-called direct projection type vehicular headlamp which does not have a reflector. 
     From the foregoing, it will be appreciated that various embodiments of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various embodiments disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.