CN102853358A - Vehicle lamp - Google Patents

Abstract

The present invention provides a projection-type vehicle lighting fixture capable of effectively suppressing a decrease in visibility caused by a problem occurring on a part of a reflective surface of a reflector. It adopts a structure in which a basic light distribution pattern approximately the same as light distribution patterns PL and PH of a lamp is formed by using reflected light from other general reflection regions except a part of the reflection region on the reflection surface of the reflector. On top of this, the part of the reflection area is configured such that light from the light source enters the projection lens as diffuse reflection light, and an additional light distribution pattern having a certain degree of spread is formed by the reflected light. Thus, even if a problem sometimes occurs in a part of the general reflection area and a dark part is formed in a part of the basic light distribution pattern, by covering the dark part with the additional light distribution pattern, a part of the light distribution pattern of the lamp is prevented from becoming abnormal. dark.

Description

Lighting fixtures for vehicles

technical field

The present invention relates to a so-called projection type vehicle lighting fixture, and particularly relates to a structure for stabilizing the light distribution performance of the vehicle lighting fixture.

Background technique

In general, projection-type vehicle lighting fixtures are configured to reflect light from a light source disposed on the rear side of the rear focal point of the projection lens toward the projection lens by using a reflector.

"Patent Document 1" describes a configuration in which, in the above-mentioned projection-type vehicle lighting fixture, a part of the reflection area of the reflection surface of the reflector is formed in a shape different from that of other reflection areas, Thereby improving the light distribution performance.

That is, in the vehicular lighting fixture described in "Patent Document 1", a part of the reflection region that contributes to the formation of the horizontal cut-off line on the opposite traffic lane side in the light distribution pattern for low beam is constituted as follows: Reflect the light from the light source near the rear focal point of the projection lens, so that even when the vehicle bumps back and forth while driving in a low-beam state, it will not cause large glare to the driver of the oncoming vehicle. On the other hand, it improves the high-beam Use the central luminosity of the light distribution pattern.

Patent Document 1: Japanese Patent Laid-Open No. 2006-79984

Contents of the invention

A projection-type vehicle lighting fixture is configured such that a light source image formed on a rear focal plane of a projection lens by reflected light from a reflector is reversely projected through the projection lens. Therefore, if there is a problem (such as the adhesion of foreign matter or the defect of the reflective evaporation film, etc.) on a part of the reflective surface of the reflector, and the reflected light from this part cannot be obtained, the light source image on the rear focal plane of the projection lens will A dark part is formed on the top of the lamp, and the dark part is reversely projected through the projection lens to form a dark part in a part of the light distribution pattern of the lamp. In addition, when such a dark portion occurs, the visibility of the road surface in front of the vehicle, the fence on the roadside, and the like is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting fixture for vehicles that can be used effectively even when a problem occurs in a part of the reflection surface of the reflector in a projection type lighting fixture for vehicles. The reduction in observability caused by this can be suppressed as much as possible.

The present invention achieves the above object by improving the structure of the reflecting surface of the reflecting mirror.

That is, the vehicle lighting fixture according to the present invention has the following parts: a projection lens; a light source arranged behind the rear focal point of the projection lens; the projection lens reflection,

It is characterized in that,

configured such that the lamp light distribution pattern to be formed by the irradiated light from the vehicle lighting lamp is formed by reflected light from other general reflective regions except a part of the reflective region on the reflective surface of the reflector,

The partial reflection area is configured to allow light from the light source to enter the projection lens as diffusely reflected light.

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

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 lighting fixture. For example, a low beam light distribution pattern of a headlamp, a high beam Use the light distribution pattern, or the light distribution pattern of the fog lamp, etc.

The above-mentioned "partial reflection area" should only be configured so that light from the light source enters the projection lens as diffusely reflected light, and its specific reflection surface shape and specific formation position on the reflection surface of the mirror are not particularly limited.

The effect of the invention

As shown in the above structure, the vehicular lighting fixture according to the present invention is configured as a projection type vehicular lighting fixture, but it is configured such that the basic light distribution pattern to be formed by the irradiated light is determined by the reflection surface from the reflector. In addition to the reflection light of other general reflection areas except a part of the reflection area, on the other hand, the part of the reflection area is configured to make the light from the light source incident to the projection lens as diffuse reflection light, so the following effects can be obtained .

That is, in the vehicular lighting fixture according to the present invention, the basic light distribution pattern serving as the light distribution pattern of the lamp is formed by using the reflected light from the general reflecting region, and on this basis, using the reflected light from a part of the reflecting region, An additional light distribution pattern with a certain degree of expansion is formed.

Therefore, even if a part of the general reflection area sometimes causes a dark part to form a part of the basic light distribution pattern, it is possible to prevent a part of the light distribution pattern of the lamp from becoming very dark by covering the dark part with an additional light distribution pattern. . And thereby, it is possible to prevent deterioration of the visibility of the road surface in front of the vehicle and the fence on the roadside, and the like.

As described above, according to the present invention, even if a problem occurs on a part of the reflective surface of the reflector in the projection type vehicle lighting fixture, it is possible to effectively suppress the deterioration of visibility caused by it. In addition, this eliminates the need to strictly perform quality control in the manufacturing process of the reflector, so that the manufacturing cost of the lamp can be correspondingly reduced.

In the above configuration, if a part of the reflection area is arranged near the optical axis of the projection lens on the reflection surface, even if the maximum diffusion angle of the diffusely reflected light from the part of the reflection area is set relatively large In the case of a value of , the diffusely reflected light can also be incident on the projection lens, whereby the additional light distribution pattern can be formed with a size close to that of the basic light distribution pattern. Therefore, even in the case where the problem-generating portion on the general reflective area fluctuates greatly, it is possible to cover the dark portion formed on the basic light distribution pattern with the additional light distribution pattern.

In the above configuration, when a light distribution pattern for low beam having a cut-off line at the upper edge is formed as the light distribution pattern of the lamp, a lamp structure is adopted in which a shade is arranged to block part of the reflected light from the reflector. , but in this case, as long as a part of the reflective area is arranged on the side of the own lane with respect to the optical axis of the projection lens, even if the vehicle bumps back and forth while driving under low beams, no warning will be given to the oncoming vehicle. The driver causes greater glare, and the above-mentioned effects can be obtained on this basis.

Description of mirror drawings

FIG. 1 is a cross-sectional plan view showing a state where a movable shade is located at a light-shielding position in a vehicle lighting fixture according to an embodiment of the present invention.

Fig. 2 is a view of arrow II-II in Fig. 1 .

3 is a perspective view showing a light distribution pattern formed on an imaginary vertical screen arranged at a position 25 m in front of the lamp by light irradiated forward from the vehicle lighting lamp.

FIG. 4 is a diagram similar to FIG. 2 showing main parts of a modified example of the above-described embodiment.

FIG. 5 is a diagram similar to FIG. 3 showing the operation of the modification described above.

Specific implementation of the mirror

Hereinafter, embodiments of the present invention will be described using the drawings.

1 is a plan cross-sectional view showing a state where a movable shade 20 is located at a light-shielding position in a vehicle lighting fixture 10 according to an embodiment of the present invention, and FIG. 2 is a view taken along line II-II.

As shown in the above-mentioned drawings, the vehicle lighting fixture 10 according to the present embodiment is configured as a projection-type lighting unit, and is used in a state of being assembled in a not-shown lamp body or the like.

The vehicular lighting fixture 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. However, the vehicle lighting fixture 10 is arranged such that its optical axis Ax extends in a downward direction of about 0.5° to 0.6° with respect to the vehicle front-rear direction when the calibration adjustment is completed.

The projection lens 18 is composed of a plano-convex aspheric lens with a convex front side surface and a flat rear side surface, and is arranged on the optical axis Ax. And, the projection lens 18 projects the light source image formed on its rear focal plane (that is, the focal plane including the rear focal point F of the projection lens 18) as an inverted image onto a virtual vertical screen arranged in front of the lamp. projection.

The light source bulb 12 is a discharge bulb such as a metal halide bulb having a discharge light emitting portion as a light source 12a, and is inserted and fixed into an opening 14b formed in the rear top of the reflector 14 from the rear side. The light source 12 a of the light source bulb 12 is configured as a line segment light source extending approximately 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 reflection mirror 14 has a reflection surface 14 a that reflects light from the light source 12 a toward the projection lens 18 .

In this reflective surface 14a, other general reflective regions 14a0 except a part of reflective region 14aA (described later) are formed to reflect light from the light source 12a forward so as to approach the optical axis Ax.

That is, the general reflective region 14a0 has a cross-sectional shape along a plane including the optical axis Ax set to a substantially elliptical shape, and its eccentricity is set to gradually increase from the vertical cross-section toward the horizontal cross-section. And thus, the light from the light source 12a reflected by the general reflection area 14a0 is substantially converged in the vicinity of the rear focus F in the vertical section, and the converging position is made to the front side of the rear focus F in the horizontal section. displacement.

On the other hand, part of the reflection area 14aA is arranged as indicated by a dotted line area in FIG. 2 so as to surround the opening 14b annularly at the inner peripheral edge of the reflection surface 14a.

The partial reflection area 14aA is configured to allow the light from the light source 12a to enter the projection lens 18 as diffused reflection light. At this time, the partial reflection region 14aA is formed to diffusely reflect the light from the light source 12a uniformly left and right at a relatively large diffusion angle with respect to the horizontal direction, and diffusely reflect it slightly downward at a relatively small diffusion angle with respect to the vertical direction.

Holder 16 is formed to extend forward in a substantially cylindrical shape from the front end opening of reflection mirror 14 , and fixedly supports reflection mirror 14 at its rear end and projection lens 18 at its front end. The lower region of the holder 16 is cut away.

The movable shade 20 is provided at substantially the lower half 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 its lower end. And, this movable shade 20 can take the following positions, that is, the light-shielding position (that is, the position indicated by the solid line in FIG. 1 and the position indicated by the double-dashed line in FIG. The light-shielding release position (that is, the position indicated by the two-dot chain line in FIG. 1 ) after the position is rotated to the rear side by a predetermined angle.

The upper edge 20a1, 20a2 of the movable shade 20 is formed so that the left and right heights are different, and when the movable shade 20 is at the light-shielding position, it is arranged to extend in a substantially circular arc along the rear focal plane of the projection lens 18 in the horizontal direction. This blocks part of the reflected light from the mirror 14 . On the other hand, when the movable shade 20 is located at the light shielding release position, the shielding of the reflected light from the reflection mirror 14 is released.

The actuator 22 is composed of a solenoid having a plunger extending in the front-back direction, and is fixed to the lower end of the mirror 14 . The actuator 22 is driven when an unillustrated beam switching switch is operated, and the plunger moves in the front-rear direction, thereby moving the movable shade 20 between the light-shielding position and the light-shielding release position.

3 is a perspective view showing a light distribution pattern formed by light irradiated forward from the vehicle lighting fixture 10 on an imaginary vertical screen arranged at a position 25 m in front of the lighting fixture. The figure (c) shows the low beam distribution pattern. The light pattern PL and (f) of the figure show the light distribution pattern PH for high beam.

The low-beam light distribution pattern PL is a light distribution pattern formed when the movable shade 20 is at the light-shielding position, as the basic light distribution pattern PL0 shown in (a) of the figure and the additional light distribution shown in (b) of the figure A synthetic light distribution pattern of the pattern PLA is formed. On the other hand, the light distribution pattern PH for high beam is a light distribution pattern formed when the movable shade 20 is at the light-shielding release position, and is the basic light distribution pattern PH0 shown in the figure (d) and the light distribution pattern shown in the figure (e). The synthetic light distribution pattern of the additional light distribution pattern PHA shown is formed.

As shown in (c) of the figure, the light distribution pattern for low beam PL is a light distribution pattern for low beam with left light distribution, and has cut-off lines CL1 and CL2 with different left and right heights at its upper edge. The cut-off lines CL1 and CL2 are formed to extend in the horizontal direction with different heights on the left and right, bounded by the line VV of HV which is the vanishing point passing in the front direction of the lamp in the vertical direction. At this time, the oncoming lane side cut-off line CL1 on the right side of the V-V line is formed to extend horizontally over its entire length, while the own-lane side cut-off line CL2 on the left side of the V-V line is formed to extend horizontally. It is formed to extend in the horizontal direction after rising from the left end position of the oncoming traffic side cut-off line CL1 via the slope.

In this light distribution pattern PL for low beam, the intersection point of the oncoming traffic side cut-off line CL1 and the V-V line, that is, the inflection point E is located approximately 0.5 to 0.6° below the HV. This is because the optical axis Ax of the lamp unit 20 extends downward at about 0.5° to 0.6° with respect to the vehicle front-rear direction. In addition, in this light distribution pattern PL for low beam, a hot zone HZL as a high luminosity region is formed so as to surround the inflection point E. As shown in FIG.

This low beam light distribution pattern PL is an 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 reflective surface 14a of the reflector 14, and passes through the projection lens 18 in the above-mentioned virtual image. The cut-off lines CL1 and CL2 which are projected as reverse projection images on the vertical screen and whose left and right heights are different are formed as reverse projection images of the upper edge 20a1 and 20a2 of the movable shade 20 .

The basic light distribution pattern PL0 shown in (a) of the figure is a light distribution pattern formed by using the reflected light from the general reflection region 14a0 in the reflection surface 14a of the reflector 14, and is substantially the same as the low beam light distribution pattern PL. formed by the light distribution pattern.

In this basic light distribution pattern PL0, a dark portion DZ is formed at the lower right position of the inflection point E thereof. This dark portion DZ is, as shown in FIG. 2 , at the upper left position of the optical axis Ax on the reflection surface 14a of the reflector 14 (the upper right position when viewing the lamp from the front), where the vapor-deposited film is formed due to the adhesion of foreign matter or reflection. In the case of the problematic part 14aD caused by chipping or the like, it is formed because the light that should be reflected from the problematic part 14aD disappears.

The additional light distribution pattern PLA shown in FIG. A darker light distribution pattern is formed. At this time, since part of the reflected light from the part of the reflection area 14aA is also blocked by the movable shade 20 located at the light-shielding position, there are cut-off lines CL1, CL2.

As shown in (c) of the figure, since the low beam light distribution pattern PL is formed as a composite light distribution pattern of the basic light distribution pattern PL0 and the additional light distribution pattern PLA, the dark part DZ of the basic light distribution pattern PL0 is formed by the additional light distribution pattern PL0. Patterned PLA overlay.

On the other hand, the high-beam light distribution pattern PH shown in (f) of the figure is formed to expand upward from the cut-off lines CL1 and CL2 with respect to the low-beam light distribution pattern PL, and has a Hot zone HZH.

The basic light distribution pattern PH0 shown in (d) of the figure is a light distribution pattern formed by reflected light from the general reflection region 14a0 in the reflection surface 14a of the reflector 14, and is substantially the same as the light distribution pattern PH for high beam. Formed by light distribution pattern. At this time, also in this basic light distribution pattern PH0 , a dark portion DZ due to the problem portion 14 aD generated on the reflection surface 14 a of the reflection mirror 14 is formed.

The additional light distribution pattern PHA shown in FIG. A darker light distribution pattern is formed.

As shown in (f) of this figure, since the light distribution pattern PH for high beam is formed as a composite light distribution pattern of the basic light distribution pattern PL0 and the additional light distribution pattern PLA, the dark part DZ of the basic light distribution pattern PH0 is formed by the additional light distribution pattern Patterned PHA coverage.

Next, the effect of this embodiment will be described.

The vehicular lighting fixture 10 according to the present embodiment is configured as a projection type vehicular lighting fixture, but is configured such that the basic light distribution pattern PL0 that should be formed by the irradiated light is substantially the same as the lamp light distribution patterns PL and PH. , PH0, formed by the reflected light from other general reflection regions 14a0 except a part of the reflection region 14aA in the reflection surface 14a of the reflector 14, on the other hand, this part of the reflection region 14aA is configured to use the light from the light source 12a as Since the diffusely reflected light enters the projection lens 18, the following effects can be obtained.

That is, in the vehicle lighting fixture 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 using the reflected light from the general reflection region 14a0, and on this basis, The additional light distribution patterns PLA, PHA having a certain degree of spread are formed by the reflected light from a part of the reflective area 14aA.

Therefore, even if a problem sometimes occurs in a part of the general reflection area 14a0 and a dark part DZ is formed in a part of the basic light distribution pattern PL0, PH0, the dark part DZ can be covered by the additional light distribution pattern PLA, PHA, thereby preventing the lamp from Parts of the light distribution patterns PL and PH become very dark. And thereby, it is possible to prevent deterioration of the visibility of the road surface in front of the vehicle and the fence on the roadside, and the like.

As described above, according to the present embodiment, even if a problem occurs on a part of the reflection surface 14a of the reflector 14 in the projection-type vehicle lighting fixture 10, the visibility caused by it can be effectively suppressed. decrease. In addition, because of this, strict quality control in the manufacturing process of the reflecting mirror 14 is not necessary, so that the manufacturing cost of the lamp can be correspondingly reduced.

At this time, in the present embodiment, part of the reflection area 14aA is arranged near the optical axis Ax of the projection lens 18 on the reflection surface 14a, so whether or not the horizontal direction of the diffusely reflected light from the part of the reflection area 14aA is arranged The maximum diffusion angle is set to a relatively large value so that the diffused reflected light can be incident on the projection lens 18 . And thus, the additional light distribution patterns PLA, PHA can be formed with a size close to that of the basic light distribution patterns PL0, PH0. Therefore, even in the case where the problematic portion on the general reflection area 14a0 fluctuates widely, the additional light distribution patterns PLA, PHA can cover the dark portion DZ formed on the basic light distribution patterns PL0, PH0.

In particular, in the present embodiment, part of the reflection region 14aA is formed so as to surround the opening 14b in an annular shape at the inner peripheral portion of the reflection surface 14a, so the basic light distribution patterns PL0 and PH0 do not need to be part of it. On the basis of the naturally deficient shape, additional light distribution patterns PLA and PHA can be formed.

In the above-mentioned embodiment, the vehicle lighting fixture 10 is configured as a light distribution pattern for low beam that forms the left light distribution as the light distribution pattern PL for low beam. Also in the case of the low beam light distribution pattern for light distribution, the same effect can be obtained by adopting the same configuration as that of the above-mentioned embodiment.

Next, modifications of the above-described embodiment will be described.

FIG. 4 is a diagram similar to FIG. 2 , showing main parts of a lighting fixture for a vehicle according to this modified example.

As shown in the figure, the basic structure of the vehicle lighting fixture according to this modified example is the same as that of the above-mentioned embodiment, but the structure of the reflection surface 114a of the reflector 114 is different from that of the above-mentioned embodiment.

That is, in this modified example, part of the reflection region 114aA is arranged in the vicinity of the optical axis Ax on the reflection surface 114a as indicated by the dotted line region in the figure, but the part of the reflection region 114aA is arranged on the left side with respect to the optical axis Ax. side (ie, ego lane side). Specifically, the partial reflection region 114aA is formed as a horizontally long substantially rectangular region adjacent to the opening 114b at the inner peripheral portion of the reflection surface 114a on the left side of the optical axis Ax.

5 is a perspective view showing a light distribution pattern formed on the virtual vertical screen by light irradiated forward from the vehicle lighting fixture 10. The figure (c) shows the low beam light distribution pattern PL, and the figure ( f) represents the light distribution pattern PH for high beam.

In this modified example, the basic light distribution shown in (a) and (d) of the figure is formed by using the reflected light from other general reflection areas 114a0 except a part of the reflection area 114aA in the reflection surface 114a of the reflection mirror 114 patterns PL1 and PH1 , and additional light distribution patterns PLB and PHB shown in (b) and (e) of the figure are formed by using the reflected light from a part of the reflective region 114aA.

And thus, even if the problematic part 114aD sometimes occurs in the general reflection area 114a0 and a dark part DZ is formed on a part of the basic light distribution patterns PL1, PH1, the dark part DZ is covered by the additional light distribution pattern PHB, thereby preventing the lamp from being distributed. Parts of the light patterns PL, PH become very dark.

At this time, in this modified example, part of the reflection area 114aA is arranged on the inner peripheral portion of the reflection surface 114a on the left side of the optical axis Ax, so that the side along the opposite traffic lane in the light distribution pattern PL for low beam is cut off. The luminance of the portion A of the line CL1 close to the inflection point E is lowered, thereby preventing a part of the low beam light distribution pattern PL and the high beam light distribution pattern PH from becoming extremely dark.

And thus, even when the vehicle is bumping back and forth while driving under low beams, it will not cause a large glare to the driver of the oncoming vehicle, and on this basis, the same effect as that of the above-mentioned embodiment can be obtained.

In addition, in the above-mentioned embodiment and its modifications, the numerical values shown as various elements are merely examples, and of course they may be appropriately set to different values.

Claims (3)

1. A lighting fixture for vehicles, comprising the following parts: a projection lens; a light source disposed on the rear side of the rear focal point of the projection lens; and a reflector that directs light from the light source to the projection lens reflection, It is characterized in that, configured such that the lamp light distribution pattern to be formed by the irradiated light from the vehicle lighting lamp is formed by reflected light from other general reflective regions except a part of the reflective region on the reflective surface of the reflector, The partial reflection area is configured to allow light from the light source to enter the projection lens as diffusely reflected light. 2. The vehicle lighting fixture according to claim 1, characterized in that: The part of the reflection area is arranged on the reflection surface near the optical axis of the projection lens. 3. The vehicle lighting fixture according to claim 1 or 2, characterized in that, A shading cover is arranged behind the projection lens to block part of the reflected light from the reflector to form a light distribution pattern for low beam having a cut-off line at an upper edge as the light distribution pattern of the lamp. , The part of the reflection area is arranged on the own lane side with respect to the optical axis of the projection lens.

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