Patent Publication Number: US-11022263-B2

Title: Headlight for vehicle

Description:
INCORPORATION BY REFERENCE 
     The disclosure of Japanese Patent Application No. 2018-122030 filed on Jun. 27, 2018 including the specification, drawings and abstract is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a headlight for a vehicle. 
     2. Description of Related Art 
     In recent years, a light emitting diode (LED) has been mainly used as a light source of a headlight for a vehicle represented by an automobile headlight. By using an LED, effects of reducing heat generation and promoting power saving in a light emitting part can be expected. 
     The following Japanese Patent Application Publication No. 2011-192451 (JP 2011-192451 A) discloses a headlight for a vehicle including a light emitting module that includes: a light emitting unit using an LED; a frame defining a light emitting surface of the light emitting unit; and an optical member. The optical member projects an image utilizing a shape of the light emitting surface by light from the light emitting surface of the light emitting unit. By projecting the light from the light emitting surface through this optical member, at least a part of a light distribution pattern for a low beam is formed. 
     SUMMARY 
     In the headlight for the vehicle of JP 2011-192451 A, the light emitting surface of the light emitting unit using the LED is configured to have a square shape. This can be considered because the light emitting surface of the LED is generally formed in a square shape, and it is preferable to form a phosphor covering the LED in a square shape in a front view in order to make full use of the light exiting from the LED. In the headlight for the vehicle according to JP 2011-192451 A, the dimension of the light emitting surface in parallel to sides located on one side of respective sides mutually orthogonal and defining the square of the light emitting surface mainly contributes to a spread in the height direction of a light distribution pattern by the light from the light emitting surface. In addition, the dimension of the light emitting surface in parallel to sides located on the other side of the respective sides mutually orthogonal and defining the square of the light emitting surface mainly contributes to a spread in the lateral direction of the light distribution pattern by the light from the light emitting surface. 
     In the meantime, in the case in which the light exiting from the light source is reflected by a reflector or refracted by a projection lens to form a desired light distribution pattern, when the sides located on the one side of the square light emitting surface of the light source has a greater dimension, the light exiting from the light source can be applied in an unintended direction. More specifically, a reflector and a projection lens are designed such that the radiation direction of light exiting from the center of a light source is defined in a predetermined direction, and light exiting from an end of the light source might be radiated in an unintended direction by the reflector or the projection lens. Therefore, the light distribution pattern might blur. In addition, it is preferable to particularly reduce blurring in the height direction in the light distribution pattern of the headlight, from the viewpoint of suppressing unclearness in the cut line of the light distribution pattern, preventing pedestrians from being dazzled, etc. 
     Therefore, the present disclosure reduces blurring of the light distribution pattern. 
     A first aspect of the present disclosure is a headlight for a vehicle. The headlight includes a light source. The a light source includes: a substrate; a light emitting diode chip disposed on the substrate; and a phosphor disposed on a light emitting surface of the light emitting diode chip. The phosphor through which light exiting from the light emitting surface penetrates. The single light emitting diode chip is disposed on the single substrate. The phosphor includes an exiting surface through which the light from the light emitting surface penetrates and exits. A first direction of the exiting surface corresponds to a height direction of a light distribution pattern by the light exiting from the exiting surface, and a second direction of the exiting surface corresponds to a spread in a lateral direction of the light distribution pattern. The second direction of the exiting surface is perpendicular to the first direction of the exiting surface. A dimension in the first direction of the exiting surface is smaller than a dimension in the second direction of the exiting surface. 
     With the above configuration, the light from the light emitting diode chip penetrates through the phosphor and exits from the exiting surface of the phosphor. Therefore, it can be said that the exiting surface of the phosphor is the light emitting surface of the light source. The dimension in the first direction of the light emitting surface of the light source corresponding to the spread in the height direction of the light distribution pattern by the light exiting from the light source is smaller than the dimension in the second direction of the light emitting surface of the light source corresponding to the spread in the lateral direction of the light distribution pattern. Therefore, in the light distribution pattern by the light exiting from the light source, it is possible to secure a sufficient spread of the light in the lateral direction, while reducing an unintended spread of the light in the height direction. By reducing the unintended spread of the light in the height direction, blurring of the light distribution pattern can be reduced. 
     In the above headlight for the vehicle, a plurality of the light sources may be arranged along the second direction. 
     With the above configuration, by arranging the plurality of light sources along the second direction, it is easy to form the light distribution pattern having a predetermined spread in the lateral direction, while reducing an unintended spread of the light in the height direction. Further, since the dimension in the second direction of the light emitting surface of each light source is larger than the dimension in the first direction thereof, in the case of arranging a plurality of light sources along the second direction in a predetermined range, a ratio of the distance between the respective light emitting surfaces of each two adjacent light sources relative to the area of the light emitting surface of each light source is smaller than that in the case in which the light emitting surface of each light source is square. Therefore, the lights exiting from each two adjacent light sources are likely to overlap each other, and thus generation of unevenness in the light distribution pattern can be reduced. 
     In the above headlight for the vehicle, the respective light sources may be configured to individually perform lighting or extinguishing. 
     With the above configuration, as the respective light sources are configured to individually perform lighting or extinguishing, it is possible to configure the headlight to be suitable for an adaptive driving beam (ADB) or the like. 
     In the above headlight for the vehicle, the light emitting surface of the light emitting diode chip may have a square shape. 
     With the above configuration, by configuring the light emitting surface of the light emitting diode chip to be in a square shape, it is possible to adopt a light emitting diode chip used for a general headlight. 
     In the above headlight for the vehicle, the dimension in the second direction of the exiting surface may be larger than a dimension in the second direction of the light emitting surface, and the dimension in the first direction of the exiting surface may be smaller than a dimension in the first direction of the light emitting surface. 
     With the above configuration, the dimension in the second direction of the exiting surface of the phosphor is larger than the dimension in the second direction of the light emitting surface of the light emitting diode chip; and the dimension in the first direction of the exiting surface of the phosphor is smaller than the dimension in the first direction of the light emitting surface of the light emitting diode chip. Therefore, in the light distribution pattern generated by the light exiting from the light source, it becomes easier to reduce the spread of the light in the height direction, while securing a sufficient spread of the light in the lateral direction. 
     In the above headlight for the vehicle, in a front view of the light source, a center of the light emitting surface of the light emitting diode chip may overlap a center of the exiting surface of the phosphor. 
     With the above configuration, when the light emitting surface of the light source is viewed along the optical axis of the light source, the light emitting diode chip and the phosphor are arranged such that the center of the light emitting surface of the light emitting diode chip and the center of the exiting surface of the phosphor overlap each other, to thereby facilitate entry and penetration of the light emitted by the light emitting diode chip through the phosphor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Features, advantages, and technical and industrial significance of exemplary embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein: 
         FIG. 1  is a front view schematically showing a vehicle provided with a headlight according to a first embodiment of the present disclosure; 
         FIG. 2  is a horizontal sectional view of a single lamp taken along line II-II in  FIG. 1 ; 
         FIG. 3  is a vertical sectional view of the single lamp taken along line III-III in  FIG. 1 ; 
         FIG. 4  is an enlarged plan view of light sources shown in  FIG. 2 ; 
         FIG. 5  is a sectional view of each light source in the perpendicular direction taken along line V-V shown in  FIG. 4 ; 
         FIG. 6A  shows a light distribution pattern of a low beam; 
         FIG. 6B  shows a light distribution pattern of a high beam; 
         FIG. 7  is a view showing a lamp according to a second embodiment of the present disclosure in the same manner as  FIG. 3 ; and 
         FIG. 8  is a view of the light source shown in  FIG. 7  as viewed from the front side. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a mode for carrying out a headlight for a vehicle according to the present disclosure will be exemplified together with the attached drawings. Embodiments exemplified below are for the purpose of facilitating understanding of the present disclosure, but are not for the purpose of limiting the present disclosure. The present disclosure can be changed or modified from the following embodiments without departing from the gist of the disclosure. 
       FIG. 1  is a front view showing an outline of a vehicle provided with headlights according to a first embodiment of the present disclosure. As shown in  FIG. 1 , a vehicle  100  is provided with a pair of headlights  1  on front left and right sides, respectively. A pair of headlights  1  provided in the vehicle  100  are symmetrical in the lateral direction. Each headlight  1  of the present embodiment includes a plurality of lamps  1   a ,  1   b ,  1   c  arranged side by side with each other, the lamp  1   a  is disposed on the outermost side of the vehicle  100 , the lamp  1   c  is disposed on the most center side of the vehicle  100 , and the lamp  1   b  is disposed between the lamp  1   a  and the lamp  1   c.    
       FIG. 2  is a view schematically showing a horizontal cross section parallel to the II-II line in  FIG. 1 , and  FIG. 3  is a view schematically showing a vertical cross section parallel to the III-III line in  FIG. 1 . That is,  FIG. 2  is a horizontally sectional view of an upper part of the lamp  1   a , and  FIG. 3  is a perpendicularly sectional view of the lamp  1   a  substantially at the center in the lateral direction. As shown in  FIGS. 2 and 3 , the lamp  1   a , which is a part of the headlight  1 , includes a housing  10  and a lamp unit LUa housed in the housing  10 . 
     The housing  10  mainly includes a lamp housing  11 , a front cover  12 , and a back cover  13 . A front part of the lamp housing  11  is open, and the front cover  12  is fixed to the lamp housing  11  so as to close this front opening. Further, an opening smaller than the front opening is formed at a rear part of the lamp housing  11 , and the back cover  13  is fixed to the lamp housing  11  so as to close this rear opening. 
     A space formed by the lamp housing  11 , the front cover  12  closing the front opening of the lamp housing  11 , and the back cover  13  closing the rear opening of the lamp housing  11  is a lamp chamber LR, and a lamp unit LUa is accommodated in the lamp chamber LR. 
     The lamp unit LUa mainly includes a reflector  20 , a support member  30 , a light source support substrate  40 , and light sources  41 . 
     The support member  30  is a metal member, and includes a top plate  31 , a back plate  32 , and a locking portion  33 . The top plate  31  is a plate-like metal member extending in a generally horizontal direction, and the back plate  32  is a plate-like metal member extending in a generally perpendicular direction. A rear end of the top plate  31  and an upper end of the back plate  32  are connected to each other. Further, a locking portion  33  is connected to the vicinity of the upper end of the back plate  32 . The locking portion  33  extends rearward from the back plate  32 , and the locking portion  33  is formed with a screw hole opening rearward. A screw  35  is screwed into this screw hole from the outer side of the lamp housing  11 , and the locking portion  33  is fixed to the lamp housing  11 . Further, a screw hole is formed also in a lower portion of the back plate  32 , and a screw  34  is screwed into this screw hole from the outer side of the lamp housing  11  so as to fix the back plate  32  to the lamp housing  11 . Thus, the back plate  32  is fixed in the inside of the lamp chamber LR in a substantially vertical state, and the top plate  31  connected to the back plate  32  is also fixed in the inside of the lamp chamber LR. The angle of the back plate  32  can be finely adjusted through adjustment of these screws  34 ,  35 , and thus the angle of the top plate  31  can also be finely adjusted. 
     The reflector  20  is fixed to a lower surface of the top plate  31 . The reflector  20  has a reflector body  24  and a plated portion  23 . The reflector body  24  is made of resin. The plated portion  23  is a thin film formed of a metal such as aluminum or a metal oxide on the front surface of the reflector body  24 . A surface of this plated portion  23  is configured as a light reflecting surface  23   r . The reflecting surface  23   r  has, for example, a concave shape formed of a free-form surface based on a parabola having its opening direction facing the front side. More specifically, the shape of the reflecting surface  23   r  in the vertical cross section is configured to be a shape lower than a vertex of the parabola with a central axis of the parabola set substantially horizontal, and the shape of the reflecting surface  23   r  in the horizontal cross section is configured to be a shape generally including the vertex of the parabola. However, the parabola of the reflecting surface  23   r  in the vertical cross section and the parabola of the reflecting surface  23   r  in the horizontal cross section may be different from each other. The shape of the reflecting surface  23   r  in the horizontal cross section may not be based on the parabolic shape, or may be a shape partially based on an ellipse or another concave shape, for example. 
     Further, the light source support substrate  40  is disposed on the lower surface of the top plate  31 , and the light sources  41  are mounted on the light source support substrate  40 . The lamp unit LUa of the present embodiment includes two light sources  41  arranged side by side in the lateral direction. However, the number of light sources  41  is not particularly limited, and may be one or three or more. The light source  41  of the present embodiment emits light that serves as part of a low beam or a high beam. 
       FIG. 4  is a plan view showing the light sources  41  shown in  FIG. 2  in an enlarged manner, and  FIG. 5  is a sectional view of each light source  41  in the perpendicular direction taken along line V-V shown in  FIG. 4 . As shown in  FIGS. 4 and 5 , each light source  41  of the present embodiment includes a substrate  42 , an LED chip  43  disposed on the substrate  42 , a phosphor  44  disposed on a light emitting surface  43 L of the LED chip  43 , a protection element  45 , a reflective material  46 , a sealing resin  47 , terminals  51 ,  52 , and a ground terminal  53 . 
     The substrate  42  is a substrate in which the terminals  51 ,  52  and the ground terminal  53 , which are electrically connected to the LED chip  43  and a protection element  45  protecting the LED chip  43  from excessive current, are integrated. A single LED chip  43  is disposed on a single substrate  42 . 
     The LED chip  43  is electrically connected to the terminal  51  via a gold bump  54 , and is electrically connected to the ground terminal  53  via a gold bump  56 . The protection element  45  is electrically connected to the terminal  52  via a gold bump  55 , and is electrically connected to the ground terminal  53  via a gold bump  57 . The terminal  51  and the terminal  52  are electrically connected in parallel by a circuit (not shown) or the like. The LED chip  43  is fed with power via the terminal  51  to emit light. Further, the LED chip  43  is surrounded by the reflective material  46 , and light emitted by the LED chip  43  can efficiently enter the phosphor  44 . In the light source  41 , the members on the substrate  42  are covered with the sealing resin  47  except for an exiting surface  41 L of the phosphor  44  described later. The sealing resin  47  is made of a white silicone resin, for example. 
     The LED chip  43  has a single light emitting surface  43 L, and the light emitting surface  43 L is covered with a single phosphor  44 . At least a part of the light exiting from the light emitting surface  43 L enters the phosphor  44  and then exits from the exiting surface  41 L of the phosphor  44 . Therefore, the exiting surface  41 L of the phosphor  44  serves as a light emitting surface of the light source  41 . The light exiting from the LED chip  43  passes through the phosphor  44  as described above, whereby the light source  41  emits light in a desired color. 
     The phosphor  44  covers the light emitting surface  43 L of the LED chip  43  as described above, and a surface of the phosphor  44  on the opposite side to the LED chip  43  is configured as the exiting surface  41 L from which light from the light emitting surface  43 L exits. As shown in  FIG. 4 , the exiting surface  41 L of the phosphor  44 , that is, the light emitting surface of the light source  41  has a rectangular shape. Note that in  FIG. 4 , the light emitting surfaces  43 L of the LED chips  43  hidden by the phosphors  44  are indicated by broken lines, respectively. In a front view of the light source  41  shown in  FIG. 4 , the center of the light emitting surface  43 L of the LED chip  43  and the center of the exiting surface  41 L of the phosphor  44  overlap each other. Further, as shown in  FIG. 4 , the dimension in the lateral direction of the exiting surface  41 L of the phosphor  44  is larger than the dimension in the lateral direction of the light emitting surface  43 L of the LED chip  43 , and the dimension in the height direction of the exiting surface  41 L of the phosphor  44  is smaller than the dimension in the height direction of the light emitting surface  43 L of the LED chip  43 . 
     The exiting surface  41 L of the phosphor  44  has a rectangular shape having a dimension d 1  in the first direction smaller than a dimension d 2  in the second direction. The dimension d 1  in the first direction is set to be 0.95 mm, for example, and the dimension d 2  in the second direction is set to be 1.15 mm, for example. Further, a distance ds between the respective exiting surfaces  41 L of the phosphors  44  adjacent to each other is set to be 0.6 mm, for example. 
     The dimension d 1  in the first direction of the light emitting surface of the light source  41  having this configuration corresponds to a spread in the height direction of the light distribution pattern by the light from the light source  41 . That is, when the dimension d 1  in the first direction of the light emitting surface of the light source  41  is set larger without changing the dimension d 2  in the second direction thereof, the light distribution pattern by the light from the light source  41  spreads out more greatly in the height direction than in the lateral direction. As shown in  FIG. 3 , the light L 1  exiting from the center of the light emitting surface of the light source  41  is reflected by the reflecting surface  23   r  of the reflector  20  and is applied to a desired position. Light Lc exiting from a front end of the light emitting surface, which is one end in the first direction of the light emitting surface of the light source  41 , is reflected by the reflecting surface  23   r  of the reflector  20  and is then radiated above the position to which the light L 1  is applied. Light Ld exiting from the rear end of the light emitting surface, which is the other end in the first direction of the light emitting surface of the light source  41 , is reflected by the reflecting surface  23   r  of the reflector  20  and is then radiated below the position to which the light L 1  is applied. Thus, as the dimension d 1  in the first direction of the light emitting surface of the light source  41  increases, a difference B between the position radiated with the light Lc and the position radiated with the light Ld increases, and the light distribution pattern is more likely to blur. 
     The dimension d 2  in the second direction of the light emitting surface of the light source  41  corresponds to a spread in the lateral direction of the light distribution pattern by the light from the light source  41 . That is, when the dimension d 2  in the second direction is set larger without changing the dimension d 1  in the first direction of the light emitting surface of the light source  41 , the light distribution pattern by the light from the light source  41  spreads more in the lateral direction than in the height direction. As shown in  FIG. 2 , light La exiting from a left end, which is one end in the second direction of the light emitting surface of the light source  41 , is reflected by the reflecting surface  23   r  of the reflector  20  and is then applied more leftward than light exiting from the center of the light emitting surface of the light source  41 . Light Lb exiting from a right end, which is the other end in the second direction of the light emitting surface of the light source  41 , is reflected by the reflecting surface  23   r  of the reflector  20  and is then applied more rightward than the light exiting from the center of the light emitting surface of the light source  41 . 
     As described above, in the light source  41  of the present embodiment, the first direction of the light emitting surface of the light source  41  is the front-rear direction of the vehicle  100 , and the second direction of the light emitting surface of the light source  41  is the lateral direction of the vehicle  100 . 
     The light sources  41  as described above are respectively mounted on the light source support substrate  40  and connected to a light emission control circuit (not shown) provided on the light source support substrate  40 . Further, each light source  41  can emit light by power fed from a light emission control circuit provided on the light source support substrate  40 . Hence, lightning and extinguishing of each light source  41  is controlled by the light emission control circuit. 
     Next, operation and effects of the headlight  1  for the vehicle of the present embodiment will be described. 
     By adjusting the position of the light sources  41 , the shape of the reflecting surface  23   r , and others, the lamp  1   a  of the present embodiment is configured as a low beam lamp or a high beam lamp. 
     When the lamp  1   a  is configured as a low beam lamp, the light L 1  from each light source  41  forms a part of the light distribution pattern in the low beam shown in  FIG. 6A . As shown in  FIG. 3 , most of the light L 1  exiting from the light sources  41  is reflected by the reflecting surface  23   r , and after being reflected by the reflecting surface  23   r , the light L 1  is radiated below a cut line of the low beam. In this case, at least a part of the light distribution pattern in the low beam is formed by the lamps  1   a  provided on the left and right of the vehicle  100 . 
     On the other hand, when the lamp  1   a  is configured as a high beam lamp, the light L 1  from the light source  41  forms a part of the light distribution pattern in the high beam shown in  FIG. 6B . As shown in  FIG. 3 , most of the light L 1  exiting from the light source  41  is reflected by the reflecting surface  23   r , and a part of the light distribution pattern in the high beam is formed. In this case, at least a part of the light distribution pattern in the high beam is formed by the lamps  1   a  provided on the left and right of the vehicle  100 . 
     As described above, the headlight  1  for the vehicle of the present embodiment includes the light sources  41  each including: the substrate  42 ; the LED chip  43  disposed on the substrate  42 ; and the phosphor  44  which is disposed on the light emitting surface  43 L of the LED chip  43 , and through which the light exiting from the light emitting surface  43 L penetrates. Each single LED chip  43  is disposed on each single substrate  42 . Further, the phosphor  44  has the exiting surface  41 L through which the light from the light emitting surface  43 L of the LED chip  43  penetrates and exits; the first direction of the exiting surface  41 L corresponds to the height direction of the light distribution pattern by the light exiting from the exiting surface  41 L; the second direction perpendicular to the first direction of the exiting surface  41 L corresponds to a spread of the light distribution pattern in the lateral direction rather than in the height direction; and the dimension d 1  in the first direction of the exiting surface  41 L is smaller than the dimension d 2  in the second direction of the exiting surface  41 L. 
     In the headlight  1  for the vehicle of the present embodiment, the light from the LED chip  43  penetrates through the phosphor  44  and exits from the exiting surface  41 L of the phosphor  44 . Therefore, it can be said that the exiting surface  41 L of the phosphor  44  is the light emitting surface of the light source  41 . The dimension d 1  in the first direction of the light emitting surface of the light source  41  corresponding to the spread in the height direction of the light distribution pattern by the light from the light source  41  is smaller than the dimension d 2  in the second direction of the light emitting surface of the light source  41  corresponding to the spread in the lateral direction of the light distribution pattern. Therefore, in the light distribution pattern by the light exiting from the light source  41 , it is possible to secure a sufficient spread of the light in the lateral direction, while suppressing an unintended spread of the light in the height direction. By suppressing an unintended spread of the light in the height direction, blurring of the light distribution pattern can be reduced. 
     In addition, by arranging a single LED chip  43  on each substrate  42 , in the case of using a plurality of LED chips  43 , heat transfer between the LED chips  43  adjacent to each other can be suppressed. Furthermore, by arranging a single LED chip  43  on each substrate  42 , when using a plurality of LED chips  43 , flexibility of the arrangement positions of each LED chip  43  is increased, and thus a desired light distribution pattern can be easily formed. 
     Further, in the headlight  1  for the vehicle of the present embodiment, the lamp  1   a  includes the plurality of light sources  41 , and the plurality of light sources  41  are arranged side by side along the second direction. Arrangement of the plurality of light sources  41  along the second direction facilitates formation of the light distribution pattern having a predetermined spread in the lateral direction, while suppressing an unintended spread of the light in the height direction. Further, since the dimension d 2  in the second direction of the light emitting surface of each light source  41  is larger than the dimension d 1  in the first direction thereof, in the case in which the plurality of light sources  41  are arranged side by side in the second direction in a predetermined range, a ratio of the distance ds between the light emitting surfaces of each two adjacent light sources  41  relative to the area of the light emitting surface of each light source  41  is smaller than that in the case where the light emitting surface of each light source  41  is square. Therefore, the lights respectively exiting from each two adjacent light sources  41  easily overlap each other, and thus generation of unevenness in the light distribution pattern can be reduced. 
     Moreover, in the headlight  1  for the vehicle of the present embodiment, the light emitting surface  43 L of the LED chip  43  is a square. By configuring the light emitting surface  43 L of the LED chip  43  in a square shape, it is possible to adopt an LED chip used for a general headlight for the vehicle. 
     In the front view of the light source  41 , the center of the light emitting surface  43 L of the LED chip  43  and the center of the exiting surface  41 L of the phosphor  44  overlap each other. When the light emitting surface of the light source  41  is viewed along the optical axis of the light source  41 , the LED chip  43  and the phosphor  44  are arranged such that the center of the light emitting surface  43 L of the LED chip  43  and the center of the exiting surface  41 L of the phosphor  44  overlap with each other, to thereby facilitate entry and penetration of the light emitted by the LED chip  43  through the phosphor  44 . Further, the dimension d 2  in the second direction of the exiting surface  41 L of the phosphor  44  is larger than the dimension in the second direction of the light emitting surface  43 L of the LED chip  43 ; and the dimension d 1  in the first direction of the exiting surface  41 L is smaller than the dimension in the first direction of the light emitting surface  43 L. Therefore, in the light distribution pattern by the light exiting from the light source  41 , it becomes easier to reduce the spread of the light in the height direction, while securing a sufficient spread of the light in the lateral direction. 
     Next, a second embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the same or equivalent components as those of the first embodiment will be denoted by the same reference numerals and overlapping description thereof will be omitted unless otherwise specifically mentioned. 
       FIG. 7  is a view schematically showing a vertical cross section of each lamp according to the second embodiment of the present disclosure. That is,  FIG. 7  is a view showing the cross section of the lamp  1   a  according to the present embodiment from the same viewpoint as that in  FIG. 3 . 
     The lamp unit LUa included in the lamp  1   a  of the present embodiment is mainly different from the lamp unit LUa of the first embodiment in that the lamp unit LUa is a projector-type lamp unit. In addition, each of the lamp  1   b  and the lamp  1   c  of the present embodiment may have the same configuration as that of the lamp  1   a , or may have a different configuration from that of the lamp  1   a.    
     The lamp unit LUa of the present embodiment includes a projection lens  60 , a lens holder  61 , a light source  41 , a base member  62 , and a turning mechanism  63 . 
     The projection lens  60  is a plano-convex aspheric lens having a convex front surface and a flat rear surface. The projection lens  60  projects a light source image, as a reverse image, formed on a rear focal plane, which is a focal plane including a rear focal point, frontward of the lamp  1   a  in a virtually perpendicular direction. Further, the projection lens  60  has a flange on its outer periphery, and this flange is fixed to the lens holder  61 . 
     Although only one reference numeral for the light source  41  is illustrated in  FIG. 8 , a plurality of light sources  41  are provided.  FIG. 8  is a view showing the plurality of light sources  41  provided in the lamp unit LUa of the present embodiment, as viewed from the front, that is, from the projection lens  60  side. As shown in  FIG. 8 , the lamp unit LUa of the present embodiment includes seven light sources  41 . However, the number of light sources  41  is not particularly limited. 
     The plurality of light sources  41  are arranged in parallel in the lateral direction behind the rear focal point of the projection lens  60 . In the present embodiment, the plurality of light sources  41  are arranged at equal intervals in the lateral direction, having a center at a position where the light sources  41  overlap the optical axis of the projection lens  60 . The light exiting from these light sources  41  and directed to the projection lens  60  passes through the rear focal plane of the projection lens  60  with a spread at a certain degree. At this time, the lights exiting from the adjacent light sources  41  partially overlap each other. 
     Further, the plurality of light sources  41  of the present embodiment are respectively configured to individually perform adjustment of brightness and control of lighting or extinguishing. For example, the plurality of light sources  41  are respectively connected to a not-shown electronic control unit (ECU), and thus the light sources  41  are respectively controlled with signals from the electronic control unit so as to individually perform adjustment of brightness and control of lighting or extinguishing in accordance with the traveling conditions of the vehicle. 
     The base member  62  is a member for supporting the lens holder  61  and the light source support substrate  40 . Further, the base member  62  is supported by the turning mechanism  63 . 
     The turning mechanism  63  is a member having a mechanism for turning the base member  62 . Since the light source  41  and the projection lens  60  are turned by turning of the base member  62 , the radiation direction of the light from the lamp unit LUa is changed. Further, the turning mechanism  63  is connected to an ECU (not shown), and the turning mechanism  63  performs the above turning in response to signals from the ECU in accordance with the traveling conditions of the vehicle, and the radiation direction of the light from the lamp unit LUa is thus adjusted. 
     Next, operation and effects of the headlight  1  for the vehicle of the present embodiment will be described. 
     By adjusting the positions of the light sources  41 , the shape of the projection lens  60 , and others, the lamp  1   a  according to the present embodiment is configured as a low beam lamp or as a high beam lamp. That is, as shown in  FIG. 8 , the light L 1  exiting from each light source  41  is adjusted in its irradiation direction as the light L 1  penetrates through the projection lens  60 , to thereby form a part of the light distribution pattern of the low beam shown in  FIG. 6A  or a part of the light distribution pattern of the high beam shown in  FIG. 6B . 
     In the above manner, even when the light from the light source  41  penetrates through the projection lens  60  to be applied, as with the case in which a reflector is used as in the first embodiment, when the dimension d 1  in the first direction of the light source  41  is increased, the light distribution pattern is more likely to blur. Also in the lamp unit LUa of the present embodiment, the dimension d 1  in the first direction of the light emitting surface of the light source  41  corresponding to the spread in the height direction of the light distribution pattern is smaller than the dimension d 2  in the second direction of the light emitting surface of the light source  41  corresponding to the spread in the lateral direction of the light distribution pattern. Therefore, in the light distribution pattern by the light L 1  exiting from the light source  41 , a sufficient spread of the light in the lateral direction can be ensured, while reducing an unintended spread of the light in the height direction. By reducing the unintended spread of the light in the height direction, blurring of the light distribution pattern can be reduced. 
     Further, in the present embodiment, as described above, the light sources  41  are respectively controlled with signals from the not-shown ECU so as to individually perform adjustment of brightness and control of lighting or extinguishing. Therefore, the headlight  1  for the vehicle provided with the lamp  1   a  of the present embodiment is suitable for an adaptive driving beam (ADB) or the like. 
     Although the present disclosure has been described by exemplifying the embodiments, the present disclosure is not limited to these embodiments. 
     For example, the number and arrangement of the light sources  41  are not particularly limited. The number of the light sources  41  may be one or more. The number and arrangement of the light sources  41  can be appropriately selected depending on the function required for the lamp  1   a . Also, a single lamp  1   a  may be configured to serve as both a high beam lamp and a low beam lamp. 
     Further, the shape of the light emitting surface  43 L of the LED chip  43  in a front view is not limited to a square shape. For example, the shape of the light emitting surface  43 L of the LED chip  43  in a front view may be the same shape as that of the exiting surface  41 L or a similar shape to the exiting surface  41 L. 
     In addition, the number of lamps is not particularly limited. When multiple lamps are provided, a position of each lamp is not particularly limited. Therefore, for example, in the above embodiment, the lamp  1   a  may be disposed on the most central side of the vehicle  100 . 
     Moreover, in the first embodiment, the manner of disposing the reflector  20  below the light source  41  has been described; however, the reflector  20  may be provided above the light source  41 . 
     Furthermore, the present disclosure is not limited to the above embodiments, and is applicable to any headlight for the vehicle that emits light through a reflector or a lens. 
     As described above, according to the present disclosure, it is possible to provide the headlight for the vehicle capable of reducing blurring of the light distribution pattern. The headlight for the vehicle can be utilized in the field of headlights, such as motor vehicles.