JP5749584B2 - Lighting fixtures for vehicles - Google Patents

Description

  The present invention relates to a so-called projector-type vehicular illumination lamp, and more particularly to a configuration for stabilizing the light distribution performance thereof.

  In general, a projector-type vehicular illumination lamp is configured to reflect light from a light source disposed rearward of the rear focus of the projection lens toward the projection lens by a reflector.

  In “Patent Document 1”, in such a projector-type vehicular illumination lamp, a part of the reflection area on the reflection surface of the reflector is formed in a shape different from that of the other reflection areas. A configuration for improving the above is described.

  That is, in the vehicular illumination lamp described in “Patent Document 1”, a part of the reflection area contributing to the formation of the horizontal cutoff line on the opposite lane side in the low beam light distribution pattern is projected from the light source. By reflecting the lens toward the rear focal point of the lens, high-beam distribution is avoided while giving a large glare to the oncoming driver even when the vehicle is pitched while driving with a low beam. The central luminous intensity of the light pattern is increased.

JP 2006-79984 A

  In the projector-type vehicle lighting device, the light source image formed on the rear focal plane of the projection lens by the reflected light from the reflector is reversely projected by the projection lens. For this reason, if a defect occurs on a part of the reflecting surface of the reflector (for example, adhesion of a foreign substance or loss of a reflective vapor deposition film) and the reflected light from this part cannot be obtained, the projection lens on the rear focal plane A dark part is formed in the light source image, and this dark part is inverted and projected by the projection lens, and a dark part is formed in a part of the lamp light distribution pattern. And when such a dark part generate | occur | produces, visibility, such as a vehicle front road surface and a fence of a roadside zone, will fall.

  The present invention has been made in view of such circumstances, and in the projector-type vehicular illumination lamp, even if a defect occurs in a part of the reflecting surface of the reflector, the visual recognition due to this An object of the present invention is to provide a vehicular illumination lamp that can effectively suppress the deterioration of the property.

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

That is, the vehicular illumination lamp according to the present invention is:
In a vehicular illumination lamp comprising: 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.
The basic light distribution pattern substantially the same as the lamp light distribution pattern to be formed by the irradiation light from the vehicle illumination lamp is reflected from the other general reflection areas except for the partial reflection area on the reflection surface of the reflector. It is configured to be formed by light,
The partial reflection region is configured to form an additional light distribution pattern having a size close to the basic light distribution pattern by causing the light from the light source to enter the projection lens as diffusely reflected light. It is characterized by that.

  The type of the “light source” is not particularly limited, and for example, a light emitting part of a discharge bulb, a filament of a halogen bulb, or the like can be employed.

  The above-mentioned “lamp light distribution pattern” is not particularly limited as long as it is a light distribution pattern formed by irradiation light from a vehicle illumination lamp. For example, a low beam light distribution pattern of a headlamp, A high beam light distribution pattern, a fog light distribution pattern, or the like can be employed.

  If the “partial reflection region” is configured so that the light from the light source is incident on the projection lens as diffuse reflection light, the specific reflection surface shape, the specific formation position on the reflection surface of the reflector, etc. Is not particularly limited.

  As shown in the above configuration, the vehicular illuminating lamp according to the present invention is configured as a projector-type vehicular illuminating lamp, and the lamp light distribution pattern to be formed by the irradiation light is reflected on the reflecting surface of the reflector. It is configured to be formed by the reflected light from other general reflection areas except the partial reflection area, while the partial reflection area is configured to make the light from the light source enter the projection lens as diffuse reflection light Therefore, the following effects can be obtained.

  That is, in the vehicular illumination lamp according to the present invention, the basic light distribution pattern as the lamp light distribution pattern is formed by the reflected light from the general reflection area, and then the reflected light from the partial reflection area. Thus, an additional light distribution pattern having a certain extent is formed.

  For this reason, even if a defect occurs in a part of the general reflection area and a dark part is formed in a part of the basic light distribution pattern, the dark part is covered with an additional light distribution pattern. Therefore, it is possible to prevent a part of the lamp light distribution pattern from becoming extremely dark. And it can prevent beforehand that visibility, such as a vehicle front road surface and a fence of a roadside belt, falls.

  As described above, according to the present invention, in the projector-type vehicular illumination lamp, even when a defect occurs in a part of the reflecting surface of the reflector, a reduction in visibility due to this is effectively suppressed. be able to. This eliminates the need for strict quality control in the reflector manufacturing process, thereby reducing the lamp manufacturing cost accordingly.

  In the above configuration, if the partial reflection area is arranged in the vicinity of the optical axis of the projection lens on the reflection surface, the maximum diffusion angle of diffuse reflection light from the partial reflection area is set to a relatively large value. Even in this case, the diffusely reflected light can be incident on the projection lens, whereby an additional light distribution pattern can be formed with a size close to the basic light distribution pattern. For this reason, even when the occurrence location of the defect in the general reflection region varies greatly, the dark portion formed in the basic light distribution pattern can be covered with the additional light distribution pattern.

  In the above configuration, when a low beam light distribution pattern having a cut-off line at the upper end edge is formed as the lamp light distribution pattern, the lamp in which a shade for shielding a part of the reflected light from the reflector is arranged. In such a case, if the vehicle is pitched during low-beam driving, the partial reflection area is arranged on the own lane side with respect to the optical axis of the projection lens. However, it is possible to obtain the above-described effects while preventing the oncoming vehicle driver from giving large glare.

The plane sectional view which shows the vehicular illumination lamp which concerns on one Embodiment of this invention in the state in which the movable shade exists in a light-shielding position II-II arrow view of FIG. The figure which shows transparently the light distribution pattern formed on the virtual vertical screen arrange | positioned in the position of 25 m ahead of the lamp | ramp by the light irradiated ahead from the said illumination lamp for vehicles The same figure as FIG. 2 which shows the principal part of the modification of the said embodiment. The same figure as FIG. 3 which shows the effect | action of the said modification.

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

  FIG. 1 is a plan sectional view showing a vehicular illumination lamp 10 according to an embodiment of the present invention in a state where a movable shade 20 is in a light shielding position, and FIG. 2 is a sectional view taken along line II-II. is there.

  As shown in these drawings, the vehicular illumination lamp 10 according to the present embodiment is configured as a projector-type lamp unit, and is used in a state of being incorporated in a lamp body or the like (not shown).

  This vehicular illumination lamp 10 includes a light source bulb 12, a reflector 14, a holder 16, a projection lens 18, a movable shade 20, and an actuator 22, and has an optical axis Ax extending in the vehicle front-rear direction. ing. However, when the aiming adjustment is completed, the vehicular illumination lamp 10 is arranged with its optical axis Ax extending in a downward direction by about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction. It has become.

  The projection lens 18 is a planoconvex aspheric lens having a convex front surface and a flat rear surface, and is disposed on the optical axis Ax. The projection lens 18 converts the light source image formed on the rear focal plane (that is, the focal plane including the rear focal point F of the projection lens 18) as an inverted image on a virtual vertical screen arranged in front of the lamp. Projected.

  The light source bulb 12 is a discharge bulb such as a metal halide bulb having a discharge light emitting portion as the light source 12a, and is inserted and fixed from the rear side to an opening portion 14b formed at the rear top portion of the reflector 14. The light source 12 a of the light source bulb 12 is configured as a line light source extending substantially coaxially with the optical axis Ax, and is disposed on the rear side of the rear focal point F of the projection lens 18.

  The reflector 14 has a reflection surface 14 a that reflects light from the light source 12 a toward the projection lens 18.

  In this reflection surface 14a, the other general reflection areas 14a0 other than the partial reflection area 14aA (which will be described later) are formed so as to reflect the light from the light source 12a forward and toward the optical axis Ax. Yes.

  That is, the cross-sectional shape along the plane including the optical axis Ax of the general reflection region 14a0 is set to be substantially elliptical, and the eccentricity is set to gradually increase from the vertical cross section toward the horizontal cross section. Yes. As a result, the light from the light source 12a reflected by the general reflection region 14a0 is substantially converged to the vicinity of the rear focal point F in the vertical section, and the convergence position is set in front of the rear focal point F in the horizontal section. It is designed to be displaced to the side.

  On the other hand, as shown by a broken line region in FIG. 2, the partial reflection region 14aA is disposed so as to surround the opening 14b in an annular shape at the inner peripheral edge portion of the reflection surface 14a.

  The partial reflection region 14aA is configured to allow light from the light source 12a to enter the projection lens 18 as diffuse reflection light. At this time, the partial reflection region 14aA diffuses and reflects light from the light source 12a evenly with a relatively large diffusion angle in the horizontal direction and diffusely reflects downward with a relatively small diffusion angle in the vertical direction. It is formed to let you.

  The holder 16 is formed so as to extend in a substantially cylindrical shape from the front end opening of the reflector 14 toward the front. The holder 16 fixes and supports the reflector 14 at the rear end, and also supports the projection lens 18 at the front end. ing. The lower region of the holder 16 is cut away.

  The movable shade 20 is provided so as to be positioned in a substantially lower half portion in the internal space of the holder 16, and is rotatably supported by the holder 16 via a rotation pin 24 extending in the left-right direction at the lower end portion thereof. Yes. The movable shade 20 has a light shielding position (that is, a position indicated by a solid line in FIG. 1 and a position indicated by a two-dot chain line in FIG. 2) and a light shielding release position that is rotated from the light shielding position to the rear side by a predetermined angle (that is, FIG. 1). The position indicated by a two-dot chain line in FIG.

  The upper end edges 20a1 and 20a2 of the movable shade 20 are formed so as to be different from each other on the left and right sides. When the movable shade 20 is in the light shielding position, it extends in a substantially arc shape in the horizontal direction along the rear focal plane of the projection lens 18. Accordingly, a part of the reflected light from the reflector 14 is shielded. On the other hand, when the movable shade 20 is in the light shielding release position, the shielding of the reflected light from the reflector 14 is released.

  The actuator 22 is composed of a solenoid having a plunger extending in the front-rear direction, and is fixed to the lower end portion of the reflector 14. The actuator 22 is driven when a beam changeover switch (not shown) is operated, and moves the movable shade 20 between the light shielding position and the light shielding release position by moving the plunger in the front-rear direction.

  FIG. 3 is a perspective view showing a light distribution pattern formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicular illumination lamp 10. c) shows the low beam distribution pattern PL, and FIG. 8 (f) shows the high beam distribution pattern PH.

  The light distribution pattern for low beam PL is a light distribution pattern formed when the movable shade 20 is in the light shielding position, and is shown in FIG. 5B as the basic light distribution pattern PL0 shown in FIG. It is formed as a combined light distribution pattern with an additional light distribution pattern PLA. On the other hand, the high beam light distribution pattern PH is a light distribution pattern formed when the movable shade 20 is at the light shielding release position, and is the same as the basic light distribution pattern PH0 shown in FIG. The light distribution pattern is formed as a synthetic light distribution pattern with the additional light distribution pattern PHA shown in FIG.

  As shown in FIG. 5C, the low beam light distribution pattern PL is a left light distribution pattern for low beams, and has upper and lower cut-off lines CL1 and CL2 at the upper edge. The cut-off lines CL1 and CL2 are formed so as to extend in the horizontal direction with a difference in left and right steps with a VV line passing through the HV as a vanishing point in the front direction of the lamp in the vertical direction. At that time, the opposite lane side cut-off line CL1 on the right side of the VV line is formed to extend in the horizontal direction over the entire length, while the own lane side cut-off line CL2 on the left side of the VV line is In addition, it is formed so as to extend in the horizontal direction after rising from the left end position of the oncoming lane side cut-off line CL1 via an inclined portion.

  In this low beam distribution pattern PL, the elbow point E, which is the intersection of the oncoming lane side 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 of the lamp unit 20 extends in a downward direction by about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction. In the low beam light distribution pattern PL, a hot zone HZL which is a high luminous intensity region is formed so as to surround the elbow point E.

  The low-beam light distribution pattern PL is obtained by converting the image of the light source 12a formed on the rear focal plane of the projection lens 18 by the light from the light source 12a reflected by the reflection surface 14a of the reflector 14 by the projection lens 18 to the virtual vertical direction. It is formed by projecting as a reverse projection image on the screen, and the cut-off lines CL1 and CL2 having different left and right steps are formed as reverse projection images of the upper edges 20a1 and 20a2 of the movable shade 20.

  A basic light distribution pattern PL0 shown in FIG. 5A is a light distribution pattern formed by the reflected light from the general reflection region 14a0 on the reflection surface 14a of the reflector 14, and is substantially the same as the low beam light distribution pattern PL. It is formed as a similar light distribution pattern.

  In this basic light distribution pattern PL0, a dark portion DZ is formed at the lower right position of the elbow point E. As shown in FIG. 2, this dark part DZ is a defective part due to adhesion of foreign matter, loss of a reflective vapor deposition film, etc. at the upper left position of the optical axis Ax on the reflecting surface 14a of the reflector 14 (upper right position in the front view of the lamp). When 14aD is generated, the light to be reflected from the defective portion 14aD disappears.

  The additional light distribution pattern PLA shown in FIG. 5B is a light distribution pattern formed by the reflected light from the partially reflective region 14aA on the reflective surface 14a of the reflector 14, and is a basic light distribution pattern PL0. The light distribution pattern is slightly smaller and darker than that. At this time, the reflected light from the partial reflection region 14aA is also partially blocked by the movable shade 20 at the light blocking position, so that the additional light distribution pattern PLA is cut at the upper edge of the left and right steps. It has offline CL1 and CL2.

  As shown in FIG. 5C, the low beam distribution pattern PL is formed as a combined light distribution pattern of the basic light distribution pattern PL0 and the additional light distribution pattern PLA. The dark part DZ of the pattern PL0 is covered with the additional light distribution pattern PLA.

  On the other hand, the high-beam light distribution pattern PH shown in FIG. 5F is formed so as to extend upward from the cut-off lines CL1 and CL2 with respect to the low-beam light distribution pattern PL. It has a zone HZH.

  A basic light distribution pattern PH0 shown in FIG. 6D is a light distribution pattern formed by reflected light from the general reflection region 14a0 on the reflection surface 14a of the reflector 14, and is substantially the same as the high beam light distribution pattern PH. It is formed as a similar light distribution pattern. At this time, also in this basic light distribution pattern PH0, a dark portion DZ due to the defective portion 14aD generated on the reflecting surface 14a of the reflector 14 is formed.

  The additional light distribution pattern PHA shown in FIG. 5E is a light distribution pattern formed by the reflected light from the partial reflection region 14aA on the reflection surface 14a of the reflector 14, and is a basic light distribution pattern PH0. The light distribution pattern is slightly smaller and darker than that.

  As shown in FIG. 5F, the high beam light distribution pattern PH is formed as a combined light distribution pattern of a basic light distribution pattern PL0 and a combined light distribution pattern of an additional light distribution pattern PLA. The dark portion DZ of the basic light distribution pattern PH0 is covered with the additional light distribution pattern PHA.

  Next, the function and effect of this embodiment will be described.

  Although the vehicular illumination lamp 10 according to the present embodiment is configured as a projector-type vehicular illumination lamp, a basic light distribution substantially similar to the lamp light distribution patterns PL and PH to be formed by the irradiation light. The patterns PL0 and PH0 are configured to be formed by the reflected light from the other general reflection areas 14a0 excluding the partial reflection area 14aA on the reflection surface 14a of the reflector 14, while the partial reflection area 14aA is a light source. Since the light from 12a is made to enter into the projection lens 18 as diffusely reflected light, the following effects can be obtained.

  That is, in the vehicular illumination lamp 10 according to the present embodiment, the basic light distribution patterns PL0 and PH0 as the lamp light distribution patterns PL and PH are formed by the reflected light from the general reflection region 14a0. The additional light distribution patterns PLA and PHA having a certain extent of spread are formed by the reflected light from the partial reflection region 14aA.

  For this reason, even if a defect occurs in a part of the general reflection region 14a0 and a dark part DZ is formed in a part of the basic light distribution patterns PL0 and PH0, the dark part DZ is additionally provided. By covering with the light distribution patterns PLA and PHA, it is possible to prevent a part of the lamp light distribution patterns PL and PH from becoming extremely dark. And it can prevent beforehand that visibility, such as a vehicle front road surface and a fence of a roadside belt, falls.

  As described above, according to the present embodiment, in the projector-type vehicle lighting device 10, even when a defect occurs in a part of the reflecting surface 14 a of the reflector 14, a reduction in visibility due to this is effective. Can be suppressed. In addition, this eliminates the need for strict quality control in the manufacturing process of the reflector 14, thereby reducing the lamp manufacturing cost accordingly.

At this time, in the present embodiment, since the partial reflection region 14aA is disposed in the vicinity of the optical axis Ax of the projection lens 18 on the reflection surface 14a, the horizontal direction of the diffusely reflected light from the partial reflection region 14aA maximum diffusion angle Razz I written in is set to a relatively large value of, can be incident the diffuse reflected light to the projection lens 18. Thus, the additional light distribution patterns PLA and PHA can be formed with a size close to the basic light distribution patterns PL0 and PH0. For this reason, even in the case where the occurrence location of the defect in the general reflection region 14a0 varies greatly, the dark portion DZ formed in the basic light distribution patterns PL0 and PH0 is covered with the additional light distribution patterns PLA and PHA. Can be.

  In particular, in the present embodiment, the partial reflection region 14aA is formed so as to annularly surround the opening 14b at the inner peripheral edge of the reflection surface 14a. It is possible to form additional light distribution patterns PLA and PHA while preventing the portion from being unnaturally chipped.

  In the above embodiment, the vehicular illumination lamp 10 has been described as being configured to form the left light distribution light beam distribution pattern as the low beam light distribution pattern PL, but the right light distribution low beam has been described. Even when the light distribution pattern is configured to be formed, the same effect can be obtained by adopting the same configuration as that of the above embodiment.

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

  FIG. 4 is a view similar to FIG. 2, showing a main part of the vehicular illumination lamp according to this modification.

  As shown in the figure, the vehicular illumination lamp according to this modification has the same basic configuration as in the above embodiment, but the configuration of the reflecting surface 114a of the reflector 114 is in the above embodiment. Is different.

  That is, also in this modified example, the partial reflection region 114aA is disposed in the vicinity of the optical axis Ax on the reflection surface 114a as shown by the broken line region in FIG. It is arranged on the left side (that is, the own lane side) with respect to the axis Ax. Specifically, the partially reflective region 114aA is formed as a horizontally long, substantially rectangular region facing the opening 114b at the inner peripheral edge of the reflective surface 114a on the left side of the optical axis Ax.

  FIG. 5 is a perspective view showing a light distribution pattern formed on the virtual vertical screen by light irradiated forward from the vehicular illumination lamp 10, and FIG. 5C shows a low beam light distribution pattern. PL, (f) in the figure shows a high beam light distribution pattern PH.

  Also in this modified example, the basic light distribution pattern as shown in FIGS. 4A and 4D due to the reflected light from the other general reflection areas 114a0 excluding the partial reflection area 114aA on the reflection surface 114a of the reflector 114. PL1 and PH1 are formed, and additional light distribution patterns PLB and PHB as shown in FIGS. 2B and 2E are formed by the reflected light from the partially reflective region 114aA.

  As a result, even if a defective portion 114aD occurs in the general reflection region 114a0 and a dark portion DZ is formed in a part of the basic light distribution patterns PL1 and PH1, this dark portion DZ is additionally provided. By covering with the light distribution pattern PHB, it is possible to prevent a part of the lamp light distribution patterns PL and PH from becoming extremely dark.

  At this time, in the present modification, the partial reflection region 114aA is disposed on the inner peripheral edge of the reflection surface 114a on the left side of the optical axis Ax, so that the opposite lane side cut-off line CL1 in the low beam light distribution pattern PL is used. In addition to reducing the brightness of the portion A near the elbow point E, it is possible to prevent a portion of the low beam light distribution pattern PL and the high beam light distribution pattern PH from becoming extremely dark. be able to.

  Thus, even when the vehicle is pitched while traveling with a low beam, it is possible to obtain substantially the same operational effects as in the case of the above-described embodiment while preventing the oncoming driver from giving large glare. it can.

  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.

DESCRIPTION OF SYMBOLS 10 Vehicle illumination lamp 12 Light source bulb 12a Light source 14, 114 Reflector 14a, 114a Reflection surface 14a0, 114a0 General reflection area 14aA, 114aA Partial reflection area 14aD, 114aD Failure part 14b, 114b Opening 16 Holder 18 Projection lens 20 Movable shade 20a1, 20a2 Upper edge 22 Actuator 24 Rotating pin A A portion near the elbow point along the opposite lane side cut-off line Ax Optical axis CL1 Opposite lane side cut-off line CL2 Own lane side cut-off line DZ Dark part E Elbow point F Rear focus HZH , HZL Hot zone PH Light distribution pattern for high beam PH0, PH1, PL0, PL1 Basic light distribution pattern PHA, PHB, PLA, PLB Additional light distribution pattern PL Light distribution pattern for low beam

Claims (3)

In a vehicular illumination lamp comprising: 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.
The basic light distribution pattern substantially the same as the lamp light distribution pattern to be formed by the irradiation light from the vehicle illumination lamp is reflected from the other general reflection areas except for the partial reflection area on the reflection surface of the reflector. It is configured to be formed by light,
The partial reflection region is configured to form an additional light distribution pattern having a size close to the basic light distribution pattern by causing the light from the light source to enter the projection lens as diffusely reflected light. A vehicular illumination lamp characterized by the above.   2. The vehicular illumination lamp according to claim 1, wherein the partial reflection region is disposed at a position near the optical axis of the projection lens on the reflection surface. A shade for shielding a part of the reflected light from the reflector is disposed behind the projection lens to form a low beam light distribution pattern having a cut-off line at the upper edge as the lamp light distribution pattern.
The vehicular illumination lamp according to claim 1, wherein the partial reflection region is disposed on the own lane side with respect to an optical axis of the projection lens.

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