JP2015002128A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently secure the luminance of a light distribution pattern even if an inclination angle of a translucent cover is large, in a vehicle lighting appliance in which a projector-type lighting appliance unit is accommodated in a lamp chamber.SOLUTION: In a reflection face 26a of a reflector 26, a left-and-right width of a first reflection region 26a1 located inside the vehicle width direction with respect to an optical axis Ax of a projection lens 22 is set at a value which is larger than a left-and-right width of a second reflection region 26a2 located outside the vehicle width direction. By this constitution, although a translucent cover 14 is largely inclined to a rear side toward the outside of the vehicle width direction, an incident angle of light which is reflected at an end edge of the outside of the vehicle width direction in the second reflection region 26a2, emitted from the projection lens 22, and made to be incident to the translucent cover 14 is suppressed to a relatively-small value, and a light amount loss caused by surface reflection at a rear face 14b of the translucent cover is suppressed to the minimum.

Description

  The present invention relates to a vehicular lamp in which a projector-type lamp unit is accommodated in a lamp chamber.

  In general, a projector-type lamp unit forms a light distribution pattern by projecting a light source image formed on the rear focal plane of a projection lens in the forward direction.

  “Patent Document 1” describes such a projector-type lamp unit that is configured to reflect light from a light source toward a projection lens by a reflector.

  In general, a projector-type lamp unit is used in a state of being housed in a lamp chamber formed by a translucent cover and a lamp body. The translucent cover is also described in the above-mentioned “Patent Document 1”. Thus, it often has a shape that is inclined rearward toward the outside in the vehicle width direction.

JP 2010-205558 A

  In the vehicular lamp in which such a projector-type lamp unit is housed in the lamp chamber, the following problems occur when the angle of inclination of the light-transmitting cover increases.

  That is, out of the light emitted from the lamp unit, the light emitted from the projection lens after being reflected at the edge of the reflector reflecting surface on the outer side in the vehicle width direction is directed toward a direction largely inclined in the inner side in the vehicle width direction. Therefore, when the tilt angle of the translucent cover increases, the incident angle when reaching the translucent cover becomes a considerably large value. For this reason, the ratio of the light reflected from the rear surface of the translucent cover increases, and the ratio of the light that passes through the translucent cover and is irradiated forward decreases.

  At this time, the light emitted from the projection lens after being reflected at the outer edge of the reflector reflecting surface in the vehicle width direction forms one end portion in the left-right direction in the light distribution pattern formed by the irradiation light from the lamp unit. Therefore, when the inclination angle of the translucent cover is increased, there is a problem that one end portion in the left-right direction of the light distribution pattern becomes dark.

  By the way, in general, a pair of vehicle lamps is provided on both the left and right sides of the vehicle. Therefore, if a light distribution pattern formed by irradiation light from the pair of left and right vehicle lamps is synthesized, the left and right direction in one light distribution pattern It is possible to compensate for the darkness of one end of the light by the other light distribution pattern.

  However, even in this case, the light reflected from the rear surface of the translucent cover in each vehicle lamp becomes a loss, so that there is a problem that it is not possible to compensate for the corresponding light loss.

  The present invention has been made in view of such circumstances, and in a vehicular lamp in which a projector-type lamp unit is housed in a lamp chamber, even if the angle of inclination of the translucent cover is large, It is an object of the present invention to provide a vehicular lamp that can sufficiently ensure the brightness of a light distribution pattern.

  The present invention is intended to achieve the above object by devising the configuration of the reflector.

That is, the vehicular lamp according to the present invention is
In the lamp chamber formed by the translucent cover and the lamp body inclined rearward toward the outside in the vehicle width direction,
A vehicle in which a lamp unit including a projection lens, a light source disposed behind the rear focal point of the projection lens, and a reflector that reflects light from the light source toward the projection lens is housed. In the lighting equipment,
The reflecting surface of the reflector includes a first reflecting region located on the inner side in the vehicle width direction with respect to the optical axis of the projection lens, and a second reflecting region located on the outer side in the vehicle width direction,
The left and right width of the first reflection region is set to a value larger than the left and right width of the second reflection region.

  The type of the “light source” is not particularly limited, and for example, a light emitting element such as a light emitting diode or a laser diode, a light source bulb, or the like can be employed.

  The specific arrangement of the “reflector” is not particularly limited as long as it is configured to reflect light from the light source toward the projection lens.

  If the left and right width of the first reflection area is set to a value larger than the left and right width of the second reflection area, the “reflection surface” can be set in each of these “first reflection area” and “second reflection area”. The specific reflecting surface shape is not particularly limited.

  As shown in the above configuration, in the vehicular lamp according to the present invention, the reflecting surface of the reflector in the lamp unit is positioned on the inner side in the vehicle width direction with respect to the optical axis of the projection lens and on the outer side in the vehicle width direction. In this case, since the left and right width of the first reflection area is set to a value larger than the left and right width of the second reflection area, the following effects are obtained. be able to.

  That is, the light reflected from the inner edge in the vehicle width direction in the first reflection region and emitted from the projection lens becomes light that is directed in a direction that is relatively largely inclined outward in the vehicle width direction, while in the second reflection region. The light that is reflected from the edge portion on the outer side in the vehicle width direction and emitted from the projection lens becomes light that travels in a direction that is relatively small and inclined inward in the vehicle width direction.

  For this reason, even when the translucent cover is largely inclined rearward toward the vehicle width direction outer side, the light is reflected from the edge of the second reflection region on the vehicle width direction outer side and emitted from the projection lens. The incident angle when light enters the light-transmitting cover can be suppressed to a relatively small value.

  Therefore, it is possible to suppress the ratio of light that is reflected from the rear surface of the light-transmitting cover out of the light emitted from the lamp unit, and to increase the ratio of light that is transmitted forward through the light-transmitting cover. it can.

  On the other hand, the light reflected from the inner edge in the vehicle width direction in the first reflection region and emitted from the projection lens becomes light that is relatively inclined toward the outer side in the vehicle width direction. The incident angle when entering the translucent cover inclined rearward is a sufficiently small value.

  Therefore, the light quantity loss due to the surface reflection on the rear surface of the translucent cover can be minimized with respect to the light reflected in both the first and second reflection regions. Thereby, it is possible to sufficiently ensure the brightness of the light distribution pattern formed by the irradiation light from the lamp unit.

  As described above, according to the present invention, in the vehicular lamp in which the projector-type lamp unit is accommodated in the lamp chamber, the brightness of the light distribution pattern is sufficiently increased even when the tilt angle of the translucent cover is large. Can be secured.

  When the configuration of the present invention is adopted, the brightness of the light distribution pattern is sufficiently ensured, but the horizontal diffusion angle of the light distribution pattern is left-right unbalanced. However, in general, a pair of vehicle lamps are provided on both the left and right sides of the vehicle. By combining light distribution patterns formed by irradiation light from the pair of left and right vehicle lamps, the vehicle as a whole is arranged in the horizontal direction. The diffusion angle can be balanced.

  In the above configuration, if the edge on the inner side in the vehicle width direction in the first reflection region is positioned on the front side of the outer edge in the vehicle width direction in the second reflection region, the light from the light source by the first reflection region The luminous flux utilization factor for the emitted light can be further increased.

  In the above configuration, if the light source is positioned on the inner side in the vehicle width direction than the optical axis, the above-described effects can be obtained without imposing a large burden on the shape of the reflecting surface of the reflector.

  In the above configuration, if a cut-off forming member for forming a cut-off line is disposed between the light source and the projection lens at the upper end portion of the light distribution pattern formed by the reflected light from the reflector, the low beam The light distribution pattern for use can be formed with a high luminous flux utilization factor. In this case, the specific configuration of the “cut-off forming member” is not particularly limited, and for example, a shade or a mirror member having an upward reflecting surface can be employed.

  In the above configuration, if the rear surface of the projection lens is subjected to a light reflection prevention process (for example, formation of an antireflection film), this also minimizes light loss due to surface reflection on the rear surface of the projection lens. Can be suppressed.

Plan sectional drawing which shows the left vehicle lamp which concerns on one Embodiment of this invention II-II sectional view of FIG. Detailed view of the main part of FIG. The figure similar to FIG. 1 which shows the vehicle lamp of the right side which concerns on the said embodiment (A) is a perspective view showing a low beam light distribution pattern formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by light emitted forward from the left vehicle lamp, (b) ) Is a perspective view showing a low beam light distribution pattern formed on the virtual vertical screen by light emitted forward from the right vehicle lamp. The figure similar to FIG. 1 which shows the left vehicle lamp which concerns on the modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan sectional view showing a left vehicle lamp 10L according to an embodiment of the present invention.

  As shown in the figure, a vehicular lamp 10L according to the present embodiment is a low beam headlamp provided at a left front end of a vehicle, and is attached to a lamp body 12 and a front end opening of the lamp body 12. The two lamp units 20L are incorporated in the lamp chamber formed by the transparent light-transmitting cover 14.

  In FIG. 1, the direction indicated by X is “front” as the vehicle and the vehicle lamp 10L, and the direction indicated by Y is “left direction” orthogonal to “front”.

  The translucent cover 14 is formed so as to extend obliquely toward the rear side toward the vehicle width direction outer side (that is, the left direction).

  The two lamp units 20L are arranged side by side in the vehicle width direction, and are arranged in a state where the lamp unit 20L located outside in the vehicle width direction is displaced rearward along the translucent cover 14. ing.

  These two lamp units 20L are both projector-type lamp units and have the same configuration. Therefore, in the following, one lamp unit 20L will be described.

  2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a detailed view of a main part of FIG.

  As shown in these drawings, the lamp unit 20L includes a projection lens 22 having an optical axis Ax extending in the vehicle front-rear direction, a light emitting element 24 disposed on the rear side of the rear focal point F of the projection lens 22, The light emitting element 24 is disposed so as to cover from above, and a reflector 26 that reflects light from the light emitting element 24 toward the projection lens 22 and a part of the reflected light from the reflector 26 are reflected upward. And a mirror member 30 having an upward reflecting surface 30a.

  At that time, the light emitting element 24 and the reflector 26 are supported by the mirror member 30, and the projection lens 22 is supported by the mirror member 30 via the lens holder 28.

  The lamp unit 20L is arranged in a state in which the optical axis Ax of the projection lens 22 extends in a downward direction by about 0.5 to 0.6 ° with respect to the vehicle front-rear direction when the lamp unit 20L is incorporated in the lamp chamber. It is like that.

  The projection lens 22 is a plano-convex aspherical lens having a convex front surface 22a and a flat rear surface 22b, and a light source image formed on the rear focal plane, which is a focal plane including the rear focal point F, as an inverted image. It projects on a virtual vertical screen in front of the lamp.

  The rear surface 22b of the projection lens 22 is subjected to a light reflection preventing process. Specifically, an antireflection film 22c is formed on the rear surface 22b.

  The projection lens 22 is supported by the lens holder 28 at the outer peripheral flange portion.

  The light emitting element 24 is a white light emitting diode and has a light emitting surface having a horizontally long rectangular shape. The light emitting element 24 is disposed on the rear side of the rear focal point F of the projection lens 22 with its light emitting surface positioned on a horizontal plane including the optical axis Ax.

  The reflection surface 26a of the reflector 26 includes a first reflection region 26a1 located on the inner side in the vehicle width direction with respect to the optical axis Ax and a second reflection region 26a2 located on the outer side in the vehicle width direction.

  The first and second reflection regions 26a1 and 26a2 each have a long axis coaxial with the optical axis Ax and a substantially elliptical curved surface having the light emission center of the light emitting element 24 as the first focal point. At this time, each of the first and second reflection areas 26a1 and 26a2 has an elliptical shape in which the vertical cross-sectional shape along the optical axis Ax is located slightly forward of the rear focal point F as the second focal point. The eccentricity is set so that the eccentricity gradually increases from the vertical cross section toward the horizontal cross section. However, the amount of increase in the eccentricity at that time is set to a value larger in the first reflection area 26a1 than in the second reflection area 26a2.

  As a result, the first reflection region 26a1 converges the light from the light emitting element 24 to a point located slightly in front of the rear focal point F in the vertical section, and considerably forwards the convergence position in the horizontal section. On the other hand, the second reflection region 26a2 converges the light from the light emitting element 24 to a point located slightly in front of the rear focal point F in the vertical section and in the horizontal section. The convergence position is moved forward to some extent.

  The left and right width of the first reflection area 26a1 is set to a value larger than the left and right width of the second reflection area 26a2. At this time, the edge P1 on the inner side in the vehicle width direction in the first reflection region 26a1 is located outside the outer peripheral edge of the projection lens 22 with respect to the optical axis Ax (that is, on the inner side in the vehicle width direction). The edge P2 on the outer side in the vehicle width direction in the region 26a2 is located inside the outer peripheral edge of the projection lens 22 with respect to the optical axis Ax (that is, the inner side in the vehicle width direction).

  In addition, the edge P1 on the inner side in the vehicle width direction in the first reflection region 26a1 is located on the front side of the edge P2 on the outer side in the vehicle width direction in the second reflection region 26a2.

  2 and 3, a reflector 26 ′ indicated by a two-dot chain line is a general reflector having a reflecting surface shape that is symmetrical with respect to the optical axis Ax.

  The inner edge P1 in the vehicle width direction in the first reflection region 26a1 is located on a straight line connecting the light emission center of the light emitting element 24 and the edge P1 ′ in the vehicle width direction on the reflection surface of the reflector 26 ′. On the other hand, the vehicle width direction outer edge P2 in the second reflection region 26a2 is located on a straight line connecting the light emission center of the light emitting element 24 and the vehicle width direction outer edge P2 'of the reflection surface of the reflector 26'. Yes. As a result, the first reflection area 26a1 is formed with substantially the same solid angle as the right half of the reflection surface of the reflector 26 ', and the second reflection area 26a2 is the same as the left half of the reflection surface of the reflector 26'. They are formed with substantially the same solid angle.

  As shown by a two-dot chain line in FIG. 3, the light emitted from the projection lens 22 after being reflected at the outer edge portion in the vehicle width direction on the reflecting surface of the reflector 26 ′ goes in a direction greatly inclined inward in the vehicle width direction. It becomes light, and the incident angle when reaching the translucent cover 14 becomes a considerably large value. For this reason, the ratio of the light reflected from the rear surface 14b of the translucent cover 14 increases, and the ratio of the light transmitted through the translucent cover 14 and irradiated forward decreases.

  On the other hand, in the reflector 26, the light emitted from the projection lens 22 after being reflected at the inner edge in the vehicle width direction in the first reflection region 26a1 is directed toward a direction that is relatively largely inclined outward in the vehicle width direction. On the other hand, the light emitted from the projection lens 22 after being reflected at the outer edge in the vehicle width direction in the second reflection region 26a2 becomes light that is directed in a direction that is relatively small and inclined in the vehicle width direction.

  Accordingly, the incident angle when the light reflected from the outer edge in the vehicle width direction in the second reflection region 26a2 and emitted from the projection lens 22 is incident on the translucent cover 14 is a relatively small value. For this reason, the ratio of the light which is transmitted through the transparent cover 14 and irradiated forward is suppressed while the ratio of the light reflected from the rear surface 14b of the transparent cover 14 is kept small in the irradiation light from each lamp unit 20L. The amount of light loss due to surface reflection can be minimized.

  On the other hand, the light reflected from the inner edge in the vehicle width direction in the first reflection region 26a1 and emitted from the projection lens 22 becomes light that is directed in a direction relatively inclined outward in the vehicle width direction. The incident angle at the time of entering 14 is a sufficiently small value.

  The upward reflecting surface 30a of the mirror member 30 is formed by subjecting the upper surface of the mirror member 30 to a mirror surface treatment such as aluminum vapor deposition. In the upward reflecting surface 30a, the left region located on the left side of the optical axis Ax (right side in the front view of the lamp) is a horizontal plane including the optical axis Ax, and the right region located on the right side of the optical axis Ax It is composed of a horizontal plane that is one step lower than the left region through a short slope. The front edge 30a1 of the upward reflecting surface 30a extends from the rear focal point F toward the left and right sides so as to curve forward along the meridional image plane of the projection lens 22. The upward reflecting surface 30a is formed in a region within a range from the front end edge 30a1 to a position away from the rear side by a certain distance.

  Then, the mirror member 30 reflects a part of the reflected light directed from the reflecting surface 26a of the reflector 26 toward the projection lens 22 on the upward reflecting surface 30a so as to be incident on the projection lens 22, and these are used as downward light. The light is emitted from the projection lens 22.

  FIG. 4 is a view similar to FIG. 1 showing the right vehicle lamp 10R according to the present embodiment.

  This vehicular lamp 10R is a lamp used in a pair with the vehicular lamp 10L, and is a low beam headlamp provided at the right front end of the vehicle.

  The vehicular lamp 10R has a symmetrical shape with the vehicular lamp 10L, and is arranged in a laterally symmetrical positional relationship with the vehicular lamp 10L.

  However, the mirror member 30 in each lamp unit 20R of the vehicle lamp 10R has a positional relationship in which the upward reflecting surface 30a translates the upward reflecting surface 30a of the mirror member 30 in each lamp unit 20L of the vehicle lamp 10L. It is formed with.

  FIG. 5A is a perspective view of a low beam light distribution pattern PLL formed on a virtual vertical screen disposed at a position 25 m ahead of the vehicle by light irradiated forward from the left vehicle lamp 10L. FIG. The low beam light distribution pattern PLL is obtained by superimposing light distribution patterns having the same shape formed by irradiation light from the two lamp units 20L.

  This low beam light distribution pattern PLL is a left light distribution light beam distribution pattern, and has upper and lower cut-off lines CL1 and CL2 at its upper edge. The cut-off lines CL1 and CL2 extend in the horizontal direction at the left and right steps with the VV line passing through the HV, which is a vanishing point in the front direction of the lamp, in the vertical direction, and are on the right side of the VV line. The opposite lane side portion is formed as a lower cut-off line CL1, and the own lane side portion on the left side of the VV line is formed as an upper cut-off line CL2 that rises from the lower cut-off line CL1 through an inclined portion. Is formed.

  The light distribution pattern PLL for low beam is obtained by using the projection lens 22 to generate the light source image of the light emitting element 14 formed on the rear focal plane of the projection lens 22 by the light from the light emitting element 14 reflected by the reflector 26. The cut-off lines CL1 and CL2 are formed as a reverse projection image of the front end edge 30a1 of the upward reflecting surface 20a of the mirror member 20.

  In this low beam light distribution pattern PLL, the elbow point E, which is the intersection of the lower cut-off line CL1 and the VV line, is located about 0.5 to 0.6 ° below HV. This is because the optical axis Ax extends in a downward direction by about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction.

  The low-beam light distribution pattern PLL ′ indicated by a two-dot chain line in FIG. 6A is formed when the reflector 26 ′ (see FIG. 3) is arranged instead of the reflector 26 as the configuration of each lamp unit 20 L. Is a light distribution pattern.

  The low-beam light distribution pattern PLL ′ is formed as a light distribution pattern that spreads evenly on the left and right sides with respect to the VV line. This is because the reflector 26 ′ has a reflective surface shape that is symmetrical with respect to the optical axis Ax.

  However, the low beam light distribution pattern PLL ′ is formed as a light distribution pattern whose right end is dark. This is because the angle of inclination of the translucent cover 14 is large, so that light for forming the right end portion of the low beam light distribution pattern PLL ′ (that is, the outer edge in the vehicle width direction on the reflecting surface of the reflector 26 ′). This is because the light reflected and emitted from the projection lens 22 is not sufficiently obtained.

  On the other hand, the low-beam light distribution pattern PLL is formed as a light distribution pattern that spreads with a relatively large diffusion angle on the left side with respect to the VV line and spreads with a relatively small diffusion angle on the right side. This is because light emitted from the projection lens 22 after being reflected at the inner edge in the vehicle width direction in the first reflection region 26a1 becomes light that is directed in a direction that is relatively largely inclined outward in the vehicle width direction. This is because the light that is reflected from the edge of the reflection region 26a2 on the outer side in the vehicle width direction and emitted from the projection lens 22 becomes light that is directed in a direction that is relatively small and inclined toward the inner side in the vehicle width direction.

  The low-beam light distribution pattern PLL is formed by using the irradiation light from each lamp unit 20L with almost no loss due to the surface reflection on the rear surface 14b of the translucent cover 14, and thus becomes a bright light distribution pattern.

  At this time, the low beam light distribution pattern PLL has a right half relatively brighter than the left half. This is because the first and second reflection regions 26a1 and 26a2 are formed with substantially the same solid angle.

  FIG. 5B is a view perspectively showing a low beam light distribution pattern PLR formed on the virtual vertical screen by light irradiated forward from the right vehicle lamp 10R.

  This light distribution pattern for low beam PLR is also a light distribution pattern for low beam distribution on the left, but with respect to the VV line, the light distribution spreads with a relatively small diffusion angle on the left side and with a relatively large diffusion angle on the right side. Formed as a pattern. This is because the vehicular lamp 10R has a shape symmetrical to the vehicular lamp 10L except for the upward reflecting surface 30a of the mirror member 30 in each lamp unit 20R.

  The low beam light distribution pattern PLR is also formed as a bright light distribution pattern, and its left half is relatively brighter than the right half.

  The low beam light distribution pattern PLR ′ indicated by a two-dot chain line in FIG. 6B is a light distribution pattern corresponding to the low beam light distribution pattern PLL ′ in FIG. It is formed as a light distribution pattern.

  As a whole vehicle, a combination of the low beam light distribution pattern PLL shown in FIG. 5A and the low beam light distribution pattern PLR shown in FIG. 5B is obtained by irradiation light from a pair of left and right vehicle lamps 10L and 10R. A low beam light distribution pattern is formed as the light distribution pattern, and the vehicle front traveling path is thus widely illuminated from the left region to the right region.

  Next, the effect of this embodiment is demonstrated.

  In the vehicular lamp 10L according to the present embodiment, the reflecting surface 26a of the reflector 26 in each lamp unit 20L has a first reflecting area 26a1 positioned on the inner side in the vehicle width direction with respect to the optical axis Ax of the projection lens 22 and the outer side in the vehicle width direction. The first reflective region 26a1 is set to have a larger left-right width than that of the second reflective region 26a2, so that the following Advantageous effects can be obtained.

  That is, the light reflected from the inner edge in the vehicle width direction in the first reflection region 26a1 and emitted from the projection lens 22 becomes light that is directed in a direction that is relatively largely inclined outward in the vehicle width, while the second reflection. The light emitted from the projection lens 22 after being reflected by the edge of the region 26a2 on the outer side in the vehicle width direction becomes light directed in a direction that is relatively small and inclined toward the inner side in the vehicle width direction.

  For this reason, although the translucent cover 14 is largely inclined rearward in the vehicle width direction outside, the light is reflected from the outer edge of the second reflection region 26a2 in the vehicle width direction and is reflected from the projection lens 22. The incident angle when the emitted light enters the translucent cover 14 can be suppressed to a relatively small value.

  Therefore, the ratio of the light that is reflected from the rear surface 14b of the translucent cover 14 in the light emitted from each lamp unit 20L is kept small, and the ratio of the light that is transmitted forward through the translucent cover 14 is large. can do.

  On the other hand, the light reflected from the inner edge in the vehicle width direction in the first reflection region 26a1 and emitted from the projection lens 22 becomes light that travels in a direction relatively inclined outward in the vehicle width direction. The incident angle when entering the translucent cover 14 inclined rearward toward the outside is a sufficiently small value.

  Therefore, the light amount loss due to the surface reflection on the rear surface 14b of the translucent cover 14 can be minimized with respect to the light reflected in any of the first and second reflection regions 26a1 and 26a2. As a result, the brightness of the low-beam light distribution pattern PLL formed by the irradiation light from each lamp unit 20L can be sufficiently secured.

  As described above, according to the present embodiment, in the vehicular lamp 10L in which the projector-type lamp unit 20L is housed in the lamp chamber, the light distribution pattern PLL for the low beam is used even though the inclination angle of the translucent cover 14 is large. The brightness of can be secured sufficiently.

  When the configuration of the present embodiment is adopted, the brightness of the low beam light distribution pattern PLL is sufficiently ensured, but the horizontal diffusion angle of the low beam light distribution pattern PLL is left-right unbalanced. However, the low beam distribution pattern PLL is combined with the low beam distribution pattern PLR formed by the light emitted from the right vehicle lamp 10R to balance the horizontal diffusion angle for the entire vehicle. Can do.

  In the present embodiment, the edge P1 on the inner side in the vehicle width direction in the first reflection region 26a1 is located on the front side of the edge P2 on the outer side in the vehicle width direction in the second reflection region 26a2. The luminous flux utilization factor for the light emitted from the light emitting element 24 (that is, the light source) by the region 26a1 can be further increased.

  In the present embodiment, a cut for forming the cut-off lines CL1 and CL2 between the light emitting element 24 and the projection lens 22 at the upper end portion of the low beam light distribution pattern PLL formed by the reflected light from the reflector 26. Since the mirror member 30 is disposed as the off-forming member, the low beam light distribution pattern PLL can be formed with a high luminous flux utilization factor. At that time, the mirror member 30 can be arranged in the same manner as in the case of a general projector-type lamp unit.

  Furthermore, in the present embodiment, since the antireflection film 22c is formed on the rear surface 22b of the projection lens 22, the light quantity loss due to the surface reflection on the rear surface 22b can be minimized.

  In the above-described embodiment, the two lamp units 20L have been described as having the same configuration, but may have different configurations. A single lamp unit 20L or three or more lamp units 20L may be arranged in the lamp chamber.

  In the above embodiment, each of the vehicle lamps 10L and 10R has been described as being configured as a headlamp for forming a low beam light distribution pattern. However, it is configured as a headlamp for forming a high beam light distribution pattern. It can also be configured as a fog lamp or a daytime running lamp.

  Next, a modification of the above embodiment will be described.

  FIG. 6 is a view similar to FIG. 1 showing the left vehicle lamp 110L according to the present modification.

  As shown in the figure, the basic configuration of the vehicular lamp 110L is the same as that of the vehicular lamp 10L of the above embodiment, but the arrangement of the light emitting elements 24 and the configuration of the reflector 126 in each lamp unit 120L are the above-described embodiments. It is different from the case of form.

  That is, in this modification, the light emitting element 24 is located on the inner side in the vehicle width direction than the optical axis Ax.

  In addition, the reflector 126 of this modification has a reflective surface shape that is symmetrical with respect to an axis Ax1 that extends in parallel with the optical axis Ax so as to pass through the light emission center of the light emitting element 24.

  At this time, the reflecting surface 126a of the reflector 126 is formed of a substantially elliptical curved surface having a long axis coaxial with the axis Ax1 and having the light emission center of the light emitting element 24 as a first focal point. At this time, the reflecting surface 126a is set to have an elliptical shape in which the vertical cross-sectional shape along the axis Ax1 is a point located slightly in front of the rear focal point F on the axis Ax1, and the second focus. The rate is set to gradually increase from the vertical cross section toward the horizontal cross section.

  As a result, also in the present modified example, the reflecting surface 126a of the reflector 126 has the left and right widths of the first reflecting region 126a1 positioned on the inner side in the vehicle width direction with respect to the optical axis Ax. It is set to a value larger than the horizontal width.

  For this reason, the light emitted from the projection lens 22 after being reflected at the inner edge in the vehicle width direction in the first reflection region 126a1 becomes light that is directed in a direction relatively inclined outward in the vehicle width direction. The light that is reflected from the edge of the reflection region 126a2 on the outer side in the vehicle width direction and emitted from the projection lens 22 becomes light that is directed in a direction that is relatively small and inclined toward the inner side in the vehicle width direction.

  Accordingly, the incident angle when the light reflected from the outer edge in the vehicle width direction in the second reflection region 126a2 and emitted from the projection lens 22 enters the translucent cover 14 is a relatively small value. For this reason, of the irradiation light from each lamp unit 120L, the ratio of the light reflected from the rear surface 14b of the transparent cover 14 is kept small, and the ratio of the light that is transmitted forward through the transparent cover 14 is Can be bigger.

  On the other hand, the light reflected from the inner edge in the vehicle width direction in the first reflection region 126a1 and emitted from the projection lens 22 becomes light that is directed in a direction that is relatively largely inclined outward in the vehicle width direction. The incident angle at the time of entering 14 is a sufficiently small value.

  Accordingly, the light amount loss due to the surface reflection on the rear surface 14b of the translucent cover 14 can be minimized with respect to the light reflected in any of the first and second reflection regions 126a1 and 126a2. Thereby, it is possible to sufficiently ensure the brightness of the low beam light distribution pattern formed by the irradiation light from each lamp unit 120L.

  As described above, even when the configuration of the present modification is employed, the brightness of the light distribution pattern for low beam can be sufficiently ensured despite the large inclination angle of the translucent cover 14.

  At this time, as in the present modification, the light emitting element 24 is positioned on the inner side in the vehicle width direction with respect to the optical axis Ax, so that the above-described effects can be obtained without imposing a heavy burden on the reflecting surface shape of the reflector 26. be able to.

  In the above modification, the reflector 126 has been described as having a reflective surface shape that is symmetrical with respect to the axis Ax1, but it is of course possible to have a configuration having a left-right asymmetrical reflective surface shape.

  In addition, the numerical value shown as a specification in the said embodiment and its modification is only an example, and of course, you may set these to a different value suitably.

  The invention of the present application is not limited to the configuration described in the above-described embodiment and its modifications, and a configuration with various other changes can be adopted.

10L, 10R, 110L Vehicle lamp 12 Lamp body 14 Translucent cover 14b Rear surface 20L, 20R, 120L Lamp unit 22 Projection lens 22a Front surface 22b Rear surface 22c Antireflection film 24 Light emitting element (light source)
26, 126 Reflectors 26a, 126a Reflecting surfaces 26a1, 126a1 First reflecting areas 26a2, 126a2 Second reflecting areas 28 Lens holder 30 Mirror member (cut-off forming member)
30a Upward reflecting surface 30a1 Front edge Ax Optical axis Ax1 Axis CL1 Lower cut-off line CL2 Upper cut-off line F Rear focus P1 Edge in the vehicle width direction P2 Edge in the vehicle width direction PLL, PLR Low beam light distribution pattern

Claims (5)

In the lamp chamber formed by the translucent cover and the lamp body inclined rearward toward the outside in the vehicle width direction,
A vehicle in which a lamp unit including a projection lens, a light source disposed behind the rear focal point of the projection lens, and a reflector that reflects light from the light source toward the projection lens is housed. In the lighting equipment,
The reflecting surface of the reflector includes a first reflecting region located on the inner side in the vehicle width direction with respect to the optical axis of the projection lens, and a second reflecting region located on the outer side in the vehicle width direction,
The vehicle lamp according to claim 1, wherein a left and right width of the first reflection region is set to a value larger than a left and right width of the second reflection region.   2. The vehicle-use vehicle according to claim 1, wherein an inner edge in the vehicle width direction of the first reflection region is located on a front side of an edge of the second reflection region on the outer side in the vehicle width direction. Light fixture.   The vehicular lamp according to claim 1, wherein the light source is located on the inner side in the vehicle width direction than the optical axis.   A cut-off forming member for forming a cut-off line is disposed between the light source and the projection lens at the upper end portion of the light distribution pattern formed by the reflected light from the reflector. The vehicular lamp according to any one of claims 1 to 3.   The vehicular lamp according to any one of claims 1 to 4, wherein a rear surface of the projection lens is subjected to a light reflection preventing process.

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