JP2008091262A - Headlight for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headlight for a vehicle capable of alleviating glare by lessening a light and darkness difference between a projection lens and its periphery part. <P>SOLUTION: The headlight for a vehicle 1 is provided with a projection lens 2 arranged on a light axis Ax extended in a back-and-forth direction of the vehicle, a light source 3 arranged further backward of a rear-side focus F of the projection lens 2, and a reflector 4 reflecting direct light from the light source 3 forward a little toward the light axis Ax, inside a lamp room 13 formed of a lamp body 11 and a cover 12. A peripheral light-emitting part 6 arranged at an outer periphery of the projection lens 2 is provided with a peripheral light-emitting face 62 with brightness lowered from the projection lens 2 side toward the outer periphery side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector-type vehicle headlamp.

In general, a projector-type vehicle headlamp includes a projection lens disposed on an optical axis extending in the vehicle front-rear direction, a light source disposed behind a rear focal point of the projection lens, and a direct light from the light source. And a reflector that reflects light toward the optical axis toward the front.
The light from the light source is reflected near the optical axis by the reflector, and the projection lens is configured to project the image on the focal plane including the rear focal point forward as a reverse image (for example, Patent Document 1). reference).

Therefore, for example, when light distribution characteristics that do not include upward light, such as a low beam (passing light distribution), are required, the lower half of the light beam that converges from the light source to the vicinity of the rear focus is covered with a shade. The light projected from the lens does not include any upward light, and a desired light distribution characteristic can be obtained.
Further, in recent years, as a light source bulb used as a light source, a discharge bulb such as a high brightness metal halide bulb is used instead of a halogen bulb.

JP 2001-110213 A

  By the way, in the case of the projector-type vehicle headlamp as described above, the difference in brightness between the projection lens and its surroundings when viewed from the front is large, so the driver and pedestrian in the oncoming vehicle are highly dazzled. In particular, when a high-intensity discharge bulb is used as the light source or when used in a high beam (light distribution for travel), the contrast (brightness difference) between the projection lens and its surroundings is large, and the driver of the oncoming vehicle And pedestrians often feel dazzling.

  Accordingly, an object of the present invention is to provide a vehicle headlamp capable of reducing the dazzling feeling in connection with solving the above-described problems.

  An object of the present invention is to provide a projection lens disposed on an optical axis extending in the vehicle front-rear direction in a lamp chamber formed by a lamp body and a cover, and a light source disposed behind the rear focal point of the projection lens. And a reflector for reflecting the direct light from the light source toward the front toward the optical axis, and the peripheral light emitting unit disposed along the outer periphery of the projection lens, This is achieved by having a peripheral light emitting surface whose luminance decreases from the projection lens side toward the outer peripheral side.

  According to the vehicle headlamp having the above configuration, by gradually reducing the luminance of the peripheral light emitting surface in the peripheral light emitting unit disposed along the outer periphery of the projection lens from the inside (projection lens side) toward the outside, The contrast between the projection lens and its surroundings can be lowered to reduce the feeling of glare.

  In the vehicle headlamp configured as described above, the peripheral light emitting unit includes a reflector disposed on an outer periphery of the projection lens, and the peripheral light emitting surface provided on the front surface of the reflector includes the projection. It is desirable to have a non-reflective region formed by a plurality of steps arranged concentrically from the lens side toward the outer peripheral surface.

  According to the vehicle headlamp having such a configuration, the brightness of the peripheral light emitting surface is increased from the inside to the outside by the non-reflective region formed by the plurality of steps provided on the front surface of the reflector disposed on the outer periphery of the projection lens. It can be gradually lowered toward Therefore, by changing the height of the step and the width in the radial direction in a stepwise manner, the luminance distribution on the peripheral light emitting surface can be easily controlled.

  Further, in the vehicle headlamp configured as described above, the peripheral light emitting unit includes a reflector disposed on an outer periphery of the projection lens, and the peripheral light emitting surface provided on the front surface of the reflector is a surface treatment. Thus, it is desirable to have a non-reflective region formed so that the luminance decreases from the projection lens side toward the outer peripheral side.

  According to the vehicle headlamp having such a configuration, the luminance of the peripheral light emitting surface is changed from the inside to the outside by the non-reflective region formed by the surface treatment provided on the front surface of the reflector disposed on the outer periphery of the projection lens. It can be gradually lowered. Therefore, the brightness distribution of the peripheral light emitting surface can be controlled by adjusting the surface treatment in stages.

  Further, in the vehicle headlamp configured as described above, the peripheral light emitting unit includes a plurality of light guides disposed concentrically from the projection lens side toward the outer peripheral side, and is disposed outside in the front view. It is preferable that the peripheral light emitting surface of the light guide thus formed emits light with lower luminance than the peripheral light emitting surface of the light guide disposed inside.

  According to the vehicle headlamp having such a configuration, the luminance of the peripheral light emitting surface is gradually increased from the inside to the outside by the plurality of light guides arranged concentrically from the projection lens side to the outer peripheral side. Can be reduced. Therefore, the luminance distribution on the peripheral light emitting surface can be controlled by adjusting the amount of light emitted from each light guide.

Moreover, in the vehicle headlamp having the above-described configuration, it is preferable that the peripheral light emitting unit is caused to emit light by a dedicated light source different from the light source.
According to the vehicle headlamp having such a configuration, the amount of light emitted from each light guide can be easily adjusted by adjusting the light emission amount of the dedicated light source.

In the vehicle headlamp having the above-described configuration, it is desirable that the dedicated light source is disposed along the outer periphery of the peripheral light emitting unit.
According to the vehicle headlamp having such a configuration, for example, the temperature rise of the dedicated light source can be suppressed by separating the mounting position of the dedicated light source such as an LED from the light source.

  According to the vehicle headlamp according to the present invention, the brightness of the peripheral light emitting surface in the peripheral light emitting unit arranged along the outer periphery of the projection lens is gradually decreased from the inside toward the outside, thereby allowing the projection lens and its The contrast with the surroundings can be lowered and the dazzling feeling can be reduced.

Hereinafter, preferred embodiments of a vehicle headlamp according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of a vehicle headlamp according to a first embodiment of the present invention, and FIG. 2 is a horizontal sectional view and a front view of the lamp unit shown in FIG.

  As shown in FIG. 1, the vehicle headlamp 1 according to the first embodiment includes a lamp chamber 13 formed by a lamp body 11 and a transparent translucent cover (cover) 12 attached to a front opening thereof. Inside, a projector-type lamp unit 14 is accommodated.

  The lamp unit 14 is supported by the lamp body 11 via an aiming mechanism 15. The aiming mechanism 15 is a mechanism for finely adjusting the mounting position and the mounting angle of the lamp unit 14, and when the aiming adjustment is performed, the lens central axis of the lamp unit 14 is 0.5 to 0.5 with respect to the vehicle front-rear direction. It extends in the downward direction by about 0.6 degrees.

  The lamp unit 14 performs light irradiation for forming a low beam light distribution pattern. In the present embodiment, the projection lens 2, the light source 3, the reflector 4, the peripheral light emitting unit 6, and the shade are used. 51, and first and second holders 52 and 53, which have a common optical axis Ax extending in the vehicle front-rear direction.

  The projection lens 2 is a plano-convex aspheric lens having a convex front surface and a flat rear surface, and is disposed on an optical axis Ax extending in the vehicle front-rear direction. The projection lens 2 projects an image on the focal plane including the rear focal point F as a reversed image (inverted vertically and horizontally) on a vertical virtual screen arranged in front of the lamp. The projection lens 2 is fixedly supported by an annular first holder 52 at the outer peripheral edge thereof.

The light source 3 is a discharge light emitting unit of the light source bulb 3a, and is disposed behind the rear focus F of the projection lens 2. The light source 3 is configured as a line light source extending along the optical axis Ax on the optical axis Ax.
The light source bulb 3a is a discharge bulb such as a metal halide bulb, and is inserted into the rear top opening 4b of the reflector 4 described later. As the light source bulb 3a, a halogen bulb or the like can be employed instead of the above-described discharge bulb.

The reflector 4 has a substantially elliptical spherical reflecting surface 4a that reflects the direct light from the light source 3 forward and toward the optical axis Ax, and the rear apex opening 4b described above.
The reflector 4 is formed so that the cross-sectional shape along the plane including the optical axis of the reflecting surface 4a is substantially elliptical, and the eccentricity is set so as to gradually increase from the vertical cross section toward the horizontal cross section. Yes. Therefore, the cross-sectional shape of the reflector 4 is flatter in the horizontal direction than in the vertical direction.

  Thereby, the reflector 4 reflects the light from the light source 3 located at the first focal point by the reflecting surface 4a, and converges it in the vicinity of the rear focal point F that substantially coincides with the second focal point in the vertical section, and also in the horizontal section. Inside, the convergence position is displaced to the front side of the rear focal point F.

  The shade 51 is integrally formed so as to extend from the substantially lower half of the first holder 52 to the rear side. The shade 51 is formed so that its upper edge passes through the rear focal point F of the projection lens 2, blocks a part of the reflected light from the reflection surface 4 a of the reflector 4 and emits it forward from the projection lens 2. Remove most of the upward light. An upper end edge 51a of the shade 51 extends in a substantially arc shape in the horizontal direction along the rear focal plane of the projection lens 2, and is formed in a step difference on the left and right.

The peripheral light emitting unit 6 disposed along the outer periphery of the projection lens 2 includes an additional reflector 41 and a reflector 61.
The additional reflector 41 is provided in the vicinity of the rear of the projection lens 2 and in the vicinity of the outer periphery of the projection lens 2, and reflects the direct light from the light source 3 in the direction away from the optical axis Ax in the rear direction. It sends out to the front surface of the body 61. The additional reflector 41 is an annular member centered on the optical axis Ax, and is configured integrally with the first holder 52. The reflection surface 41a is formed along the outer peripheral surface of the projection lens 2 over the entire periphery. Yes.

The reflector 61 is fixedly supported by the second holder 53 integrated with the reflector 4. As shown in FIG. 2, the reflector 61 has a peripheral light emitting surface 62 whose luminance decreases from the projection lens 2 side toward the outer peripheral side. The outer diameter of the reflector 61 is formed to be approximately twice the diameter of the projection lens 2.
The reflector 61 reflects the direct light from the light source 3 reflected by the additional reflector 41 to the front by the peripheral light emitting surface 62 on the front side.

  As shown in FIG. 2B, the peripheral light emitting surface 62 of the first embodiment has a plurality (four in this embodiment) of concentric rings arranged concentrically from the projection lens 2 side toward the outer peripheral portion. Peripheral light emitting surfaces 62a, 62b, 62c, and 62d, and the widths W1, W2, W3, and W4 in the radial direction become narrower as the distance from the projection lens 2 is closer to the outer periphery. Note that the “peripheral light emitting surface” in the present invention refers to a surface that shines when viewed from the front centering on the projection lens, and is not particularly limited to a planar shape. .

The peripheral light emitting surface 62 of the first embodiment is formed in a stepped shape with steps D1, D2, and D3 between adjacent peripheral light emitting surfaces 62a, 62b, 62c, and 62d, and goes to the outer periphery. It is inclined and arranged so that it is retracted backwards.
Therefore, as shown in FIG. 3, the concentric annular peripheral light emitting surfaces 62a, 62b, 62c, and 62d are partially blocked by the steps D1, D2, and D3 from the incident reflected light from the additional reflector 41. The non-reflective areas α1, α2, and α3, which are shadow portions where no reflected light hits, and the reflective areas β0, β1, β2, β3, and β4 that hit the reflected light are formed.

Here, as shown in FIG. 2B and FIG. 3, the reflector 61 of the first embodiment includes four concentric annular peripheral light emitting surfaces 62a, 62b, and 62c formed by steps D1, D2, and D3. 62d is controlled by changing the radial widths W1, W2, W3, W4 of the peripheral light emitting surface 62. That is, since the non-reflective area α3 can be enlarged and the reflective area β3 can be narrowed as the peripheral light emitting surface 62d closer to the outer periphery, the luminance of the peripheral light emitting surface 62 is decreased stepwise from the inside toward the outside. be able to.
In addition, by changing the height of the steps D1, D2, and D3, the non-reflection areas α1, α2, and α3 can be adjusted to control the luminance distribution of the peripheral light emitting surface 62.

Thus, according to the vehicle headlamp 1 of the first embodiment, the brightness of the peripheral light emitting surface 62 in the peripheral light emitting unit 6 arranged along the outer periphery of the projection lens 2 is increased from the inside to the outside. Therefore, the contrast between the projection lens 2 and its surroundings can be lowered, and the dazzling feeling of the driver of the oncoming vehicle and the pedestrian can be effectively reduced.
If the brightness of the peripheral light-emitting surface is not lowered stepwise from the inside to the outside simply by providing a peripheral light-emitting portion on the outer periphery of the projection lens 2, the driver of an oncoming vehicle or a pedestrian is dazzled. The feeling of feeling could not be reduced sufficiently.

  Furthermore, according to the vehicle headlamp 1 of the first embodiment, the non-reflective region formed by the plurality of steps D1, D2, D3 provided on the front surface of the reflector 61 arranged on the outer periphery of the projection lens 2 With α1, α2, and α3, the luminance of the peripheral light emitting surface 62 can be gradually decreased from the inside toward the outside. Therefore, the luminance distribution of the peripheral light emitting surface 62 can be easily controlled by changing the heights of the steps D1, D2, D3 and the radial widths W1, W2, W3, W4 stepwise.

Next, a vehicle headlamp according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the vehicular headlamp according to the second embodiment, the vehicular headlamp according to the first embodiment is that the peripheral light-emitting unit 7 is provided instead of the peripheral light-emitting unit 6 in the lamp unit 14 according to the first embodiment. Different from lamp 1.

The peripheral light emitting unit 7 in the lamp unit 24 of the second embodiment includes an additional reflector 41 and a reflector 71.
The reflector 71 is fixedly supported by the second holder 53 integrated with the reflector 4. As shown in FIG. 4, the reflector 71 has a peripheral light emitting surface 72 whose luminance decreases from the projection lens 2 side toward the outer peripheral side on the front surface. The outer diameter of the reflector 71 is formed to be approximately twice the diameter of the projection lens 2.
The reflector 71 reflects the direct light from the light source 3 reflected by the additional reflector 41 forward by the peripheral light emitting surface 72 on the front side.

  As shown in FIG. 4B, the peripheral light emitting surface 72 of the second embodiment is a non-reflective region formed so that the luminance gradually decreases from the projection lens 2 side to the outer peripheral side by surface treatment. A portion other than the non-reflective region α constitutes a reflective region β that reflects the reflected light from the additional reflector 41 forward.

The non-reflective region α of the second embodiment is formed so that the luminance decreases from the projection lens 2 side toward the outer surface side by providing a circular recess as a surface treatment. Here, the shape of the concave hole is not limited to a circular shape, and various shapes can be adopted.
That is, since the reflected light from the additional reflector 41 that has entered the non-reflective region α is scattered and not reflected forward, the light traveling forward is attenuated. The non-reflective region α is formed so that the number and area gradually increase from the projection lens 2 side toward the outer peripheral side. Therefore, the luminance of the peripheral light emitting surface 72 can be gradually reduced stepwise from the projection lens 2 side toward the outer peripheral side.

  In addition, as a surface treatment mode in which the reflected light from the additional reflector 41 is scattered and not reflected forward, in addition to the circular concave portion described above, surface treatment such as embossing or matte finishing is performed, so that from the projection lens 2 side. The brightness of the peripheral light emitting surface 72 may be gradually reduced stepwise toward the outer peripheral side.

  Therefore, according to the vehicle headlamp of the second embodiment, the non-reflective region α is provided on the front surface of the reflector 71 by the surface treatment to scatter the reflected light from the additional reflector 41 incident on this portion. The brightness of the peripheral light emitting surface 72 can be gradually decreased from the inside toward the outside. Therefore, the brightness distribution of the peripheral light emitting surface can be controlled by adjusting the surface treatment in stages.

  Thus, according to the vehicle headlamp of the second embodiment, the luminance of the peripheral light emitting surface 72 in the peripheral light emitting unit 7 arranged along the outer periphery of the projection lens 2 is stepped from the inside to the outside. By lowering the contrast, the contrast between the projection lens 2 and its surroundings can be lowered, and the dazzling feeling of the driver of the oncoming vehicle and the pedestrian can be reduced.

Next, a vehicle headlamp according to a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the vehicular headlamp of the third embodiment, the vehicular headlamp of the first embodiment is that the peripheral light-emitting unit 8 is provided instead of the peripheral light-emitting unit 6 in the lamp unit 14 of the first embodiment. Different from lamp 1.

As shown in FIG. 5, the peripheral light emitting unit 8 in the lamp unit 34 of the third embodiment includes a first light guide 81 and a second light guide arranged concentrically from the projection lens 2 side toward the outer peripheral side. The body 82 is composed of a first elliptical reflecting mirror 812 and a second elliptical reflecting mirror 822.
The first light guide 81 and the second light guide 82 are fixedly supported by a holder 54 integrated with the reflector 4, and the peripheral light emitting surface 821 of the second light guide 82 disposed on the outside in a front view. However, it emits light with lower brightness than the peripheral light emitting surface 811 of the first light guide 81 disposed inside. However, the peripheral light emitting surfaces 811 and 821 here also refer to surfaces that shine when viewed from the front with the projection lens 2 as the center, as described above, and have a particularly planar shape. Not limited to.

  The annular first light guide 81 having a substantially C shape is a light guide material such as a plastic resin material having optical characteristics with a low propagation rate and a good propagation rate. The light introduced from the start end face 811a facing the elliptical reflecting mirror 812 is guided to the end face 811b. The first light guide 81 is provided with fine irregularities (not shown) on the outer peripheral surface in order to emit light to the outside at a uniform rate as much as possible over the entire circumference from the start end surface 811a to the end surface 811b. In addition, the cross-sectional shape of the 1st light guide 81 is not restricted circularly like this embodiment, Various cross-sectional shapes, such as a rectangle, are employable.

  The first elliptical reflecting mirror 812 having an elliptical reflecting surface 812a for taking in direct light from the light source 3 and sending it to the first light guide 81 is provided between the start end surface 811a and the end surface 811b of the first light guide 81. In the gap, the elliptical reflecting surface 812a is installed in a state of facing the starting end surface 811a. The elliptical reflecting surface 812a is formed in a substantially elliptical spherical shape in order to reflect the direct light from the light source 3 and to efficiently enter the starting end surface 811a of the first light guide 81.

  On the other hand, the annular second light guide 82 having a substantially C-shape is similar to the first light guide 81, and is a light guide material such as a plastic resin material that is hard to be attenuated and has good propagation characteristics. The cross section is formed in a circular shape.

  A second elliptical reflecting mirror 822 having an elliptical reflecting surface 822a for taking in direct light from the light source 3 and sending it to the second light guide 82 is provided between the start end face 821a and the end face 821b of the second light guide 82. In the gap, the elliptical reflecting surface 822a is installed in a state of facing the starting end surface 821a. The elliptical reflecting surface 822a is formed in a substantially elliptical spherical shape so that the direct light from the light source 3 is reflected and efficiently incident on the starting end surface 821a of the second light guide 82.

Then, the number of fine irregularities provided on the outer peripheral surface of the second light guide 82 is less than the fine irregularities provided on the outer peripheral surface of the first light guide 81, and the size of the irregularities is reduced to emit light to the outside. The peripheral light emitting surface 821 of the second light guide 82 is guided to the first light guide by suppressing the amount of light to be lowered or by making the transmittance of the second light guide 82 lower than the transmittance of the first light guide 81. Light is emitted at a lower luminance than the peripheral light emitting surface 811 of the body 81.
Further, by making the reflectance of the second elliptical reflecting mirror 822 lower than the reflectance of the first elliptical reflecting mirror 812, the peripheral light emitting surface 821 of the second light guide 82 is changed to the peripheral light emitting surface of the first light guide 81. It may be configured to emit light with a lower luminance than 811.

That is, according to the vehicular headlamp of the third embodiment, the peripheral light emitting surface 811 and the peripheral light emitting surface 821 are adjusted by adjusting the amounts of light emitted from the first light guide 81 and the second light guide 82, respectively. It is possible to control the luminance distribution. Therefore, the peripheral light emitting surface 821 of the second light guide 82 disposed on the outer side can emit light with lower brightness than the peripheral light emitting surface 811 of the first light guide 81 disposed on the inner side.
Accordingly, by gradually reducing the luminance of the peripheral light emitting surface 811 and the peripheral light emitting surface 821 from the projection lens 2 side toward the outer peripheral side, the contrast between the projection lens 2 and its surroundings is lowered, and the driver of the oncoming vehicle or the like A dazzling feeling of a pedestrian can be reduced.

Next, a vehicle headlamp according to a fourth embodiment of the invention will be described with reference to FIG. In the present embodiment, the same parts as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the vehicle headlamp of the fourth embodiment, a dedicated light source is provided instead of the first elliptical reflecting mirror 812 and the second elliptical reflecting mirror 822 in the peripheral light emitting unit 8 of the third embodiment. This is different from the vehicle headlamp of the third embodiment.

  As shown in FIG. 6, the peripheral light emitting unit 9 in the lamp unit 44 of the fourth embodiment includes a first light guide 81 and a second light guide arranged concentrically from the projection lens 2 side toward the outer peripheral side. The body 82 and the LED 813 and the LED 823 which are dedicated light sources are configured. In addition, as a dedicated light source, various light sources, such as semiconductor light emitting elements, such as LED, and a light bulb, can be used.

The LED 813 for sending light to the first light guide 81 is installed in the gap between the start end surface 811a and the end surface 811b of the first light guide 81 with the light emitting surface facing the start end surface 811a.
On the other hand, the LED 823 for sending light to the second light guide 82 is installed in the gap between the start end surface 821a and the end surface 821b of the second light guide 82 with the light emitting surface facing the start end surface 821a. Yes.

That is, according to the vehicle headlamp of the fourth embodiment, the luminance distribution of the peripheral light emitting surface 811 and the peripheral light emitting surface 821 can be controlled by adjusting the light emission amounts of the LED 813 and the LED 823, respectively. Therefore, the peripheral light emitting surface 821 of the second light guide 82 disposed on the outer side can emit light with lower brightness than the peripheral light emitting surface 811 of the first light guide 81 disposed on the inner side.
Accordingly, by gradually reducing the luminance of the peripheral light emitting surface 811 and the peripheral light emitting surface 821 from the projection lens 2 side toward the outer peripheral side, the contrast between the projection lens 2 and its surroundings is lowered, and the driver of the oncoming vehicle or the like A dazzling feeling of a pedestrian can be reduced.

Next, vehicle headlamps according to fifth and sixth embodiments of the present invention will be described with reference to FIG. In addition, the lamp unit 54 according to the fifth embodiment is illustrated in the upper half of the center line C in FIG. 7, and the lamp unit 64 according to the sixth embodiment is illustrated in the lower half of the center line C. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
First, in the vehicle headlamp of the fifth embodiment, the point that the peripheral light emitting unit 10 is provided instead of the peripheral light emitting unit 6 of the first embodiment is the same as the vehicle headlamp 1 of the first embodiment. Is different.

  The peripheral light emitting unit 10 in the lamp unit 54 of the fifth embodiment includes a first light guide 91 disposed on the outer peripheral side of the projection lens 2 as shown in the upper half of the center line C in FIG. And an LED 913 as a dedicated light source arranged along the outer periphery of the light emitting unit 10.

  The first light guide 91 according to the fifth embodiment includes a reflective surface 91a that reflects light from the LED 913 forward at a predetermined angle, and receives reflected light from the reflective surface 91a and forwards at a predetermined angle. And a peripheral light emitting surface 91b that emits light, and is formed in a substantially annular shape extending along the outer periphery of the projection lens 2.

The reflection surface 91a and the peripheral light emitting surface 91b are such that the outgoing light b1 forward is parallel light at the inner peripheral portion of the first light guide 91, but the forward outgoing light b2 decreases downward toward the outer peripheral portion. Designed with a free-form surface so that
Therefore, since the peripheral light emitting surface 91b when viewed from the front looks brighter in the parallel light portion, the luminance of the peripheral light emitting surface 91b can be gradually decreased from the inside toward the outside.
Note that the luminance distribution of the first light guide 91 can be controlled by changing the free curved surfaces of the reflecting surface 91a and the peripheral light emitting surface 91b to adjust the angles of the outgoing lights b1 and b2.

On the other hand, in the vehicle headlamp of the sixth embodiment, the point that the peripheral light emitting unit 20 is provided instead of the peripheral light emitting unit 6 of the first embodiment is the same as the vehicle headlamp 1 of the first embodiment. Is different.
The peripheral light emitting unit 20 of the lamp unit 64 according to the sixth embodiment includes a second light guide 92 disposed on the outer peripheral side of the projection lens 2 as illustrated in the lower half of the center line C in FIG. LED 923 as a dedicated light source arranged along the outer periphery of the peripheral light emitting unit 20.

The second light guide 92 according to the sixth embodiment includes a reflecting surface 92a that reflects light from the LED 923 forward at a predetermined angle, and a peripheral light emitting surface that emits the reflected light from the reflecting surface 92a in front in parallel. 92b, and is formed in a substantially annular shape extending along the outer periphery of the projection lens 2.
Further, the LED 923 according to the sixth embodiment is arranged so that the irradiation axis is inclined forward, and irradiates strong light along the irradiation axis toward the inner peripheral portion of the reflecting surface 92a. Distant weak light can be irradiated toward the outer peripheral portion of the reflecting surface 92a.

Therefore, the reflected light of the reflecting surface 92a emitted forward from the peripheral light emitting surface 92b is stronger at the inner peripheral portion of the peripheral light emitting surface 92b and becomes weaker toward the outer peripheral portion.
That is, when viewed from the front, the peripheral light emitting surface 92b looks brighter at the inner peripheral portion where the emitted light b3, which is a strong light, is emitted, so that the luminance of the peripheral light emitting surface 92b gradually increases from the inside toward the outside. Can be reduced.
In addition, by changing the inclination angle of the irradiation axis of the LED 923, the luminance of the emitted lights b3 and b4 can be adjusted to control the luminance distribution of the peripheral light emitting surface 92b.

That is, according to the vehicle headlamp of the fifth or sixth embodiment, the free curved surfaces of the reflecting surface 91a and the peripheral light emitting surface 91b are appropriately designed, and the inclination angle of the irradiation axis of the LED 923 to the front is adjusted. As a result, the luminance distribution of the peripheral light emitting surface 91b or the peripheral light emitting surface 92b can be controlled. Therefore, the peripheral light emitting surface 91b or the peripheral light emitting surface 92b can emit light with lower luminance than the inner peripheral surface.
Accordingly, by gradually reducing the luminance of the peripheral light emitting surface 91b or the peripheral light emitting surface 92b from the projection lens 2 side toward the outer peripheral side, the contrast between the projection lens 2 and its surroundings is lowered, and the driver of the oncoming vehicle or the like A dazzling feeling of a pedestrian can be reduced.

In the vehicle headlamps of the fifth and sixth embodiments, the LEDs 913 and 923 are disposed along the outer periphery of the peripheral light emitting units 10 and 20.
According to the vehicle headlamp having such a configuration, the temperature rise of the LEDs 913 and 923 can be suppressed by separating the mounting positions of the LEDs 913 and 923 from the light source 3.

For example, the peripheral light emitting unit 10 of the fifth embodiment described above and the peripheral light emitting unit 20 of the sixth embodiment are combined, and a substantially semicircular annular peripheral light emitting unit 10 is provided along the upper part of the outer periphery of the projection lens 2. In addition, a substantially semi-circular peripheral light emitting unit 10 may be provided along the lower part of the outer periphery of the projection lens 2.
Further, the vehicle headlamp of the present invention is not limited to the configuration of each of the embodiments described above, and it is needless to say that various forms can be taken based on the gist thereof.
For example, the arrangement of the additional reflector 41 and the reflector 71 in the lamp unit 24 of the second embodiment is reversed inside and outside, the reflector 71 is provided along the outer periphery of the projection lens 2, and the outer periphery in the immediate vicinity of the reflector 71 is provided. It is good also as a structure which provided the additional reflector 41 along.

  In each of the above embodiments, the projector type vehicle headlamp used for the low beam has been described as an example. However, the present invention is not limited to this, and can be applied to various vehicle headlamps. Of course. In particular, a high beam projector type vehicle headlamp using a discharge bulb has a large contrast between the projection lens and its surroundings, and the driver or pedestrian of the oncoming vehicle often feels dazzling. Great effect.

  The front opening of the reflector is also used when the lamp unit is a dual-use headlamp having a parabolic type reflector (reflecting surface of a substantially paraboloid) that reflects the direct light from the light source bulb forward. By arranging a peripheral light emitting part along the outer periphery of the reflector and providing a peripheral light emitting surface whose luminance decreases from the front opening side of the reflector toward the outer peripheral side, the contrast between the reflective surface of the reflector and its surroundings is lowered, A dazzling feeling can be reduced.

It is a longitudinal cross-sectional view of the vehicle headlamp which concerns on 1st Embodiment of this invention. (A) is the horizontal sectional view of the lamp unit shown in FIG. 1, (b) is the front view. It is a principal part expansion explanatory drawing of the peripheral light emission part in the lamp unit shown to Fig.2 (a). (A) is a horizontal sectional view of the lamp unit of the vehicle headlamp according to the second embodiment of the present invention, and (b) is a front view thereof. (A) is a horizontal sectional view of the lamp unit of the vehicle headlamp according to the third embodiment of the present invention, and (b) is a front view thereof. (A) is the horizontal cross section of the lamp unit of the vehicle headlamp which concerns on 4th Embodiment of this invention, (b) is the front view. It is a longitudinal cross-sectional view of the lamp unit of the vehicle headlamp which concerns on 5th and 6th embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Projection lens 3 Light source 3a Light source bulb 4 Reflector 11 Lamp body 12 Translucent cover (cover)
13 lamp chamber 14 lamp unit 41 additional reflector 41a reflecting surface 51 shade 52 first holder 53 second holder 6 peripheral light emitting portion 61 reflector 62 peripheral light emitting surface D1, D2, D3 step α, α1, α2, α3 non-reflective region β , Β0, β1, β2, β3, β4 Reflection area Ax Optical axis F Rear focus

Claims (6)

In a lamp chamber formed by a lamp body and a cover, a projection lens disposed on an optical axis extending in the vehicle front-rear direction, a light source disposed behind a rear focal point of the projection lens, and a direct light from the light source A vehicle headlamp comprising: a reflector that reflects light toward the optical axis toward the front;
The vehicular headlamp characterized in that a peripheral light emitting unit disposed along the outer periphery of the projection lens has a peripheral light emitting surface whose luminance decreases from the projection lens side toward the outer peripheral side. The peripheral light emitting unit has a reflector disposed on an outer periphery of the projection lens;
The peripheral light-emitting surface provided on the front surface of the reflector has a non-reflective region formed by a plurality of steps arranged concentrically from the projection lens side toward the outer peripheral surface. The vehicle headlamp according to claim 1. The peripheral light emitting unit has a reflector disposed on an outer periphery of the projection lens;
2. The peripheral light emitting surface provided on the front surface of the reflector has a non-reflective region formed so that the luminance decreases from the projection lens side toward the outer peripheral side by surface treatment. The vehicle headlamp described in 1. The peripheral light emitting unit has a plurality of light guides arranged concentrically from the projection lens side toward the outer peripheral side,
2. The vehicle according to claim 1, wherein a peripheral light emitting surface of the light guide disposed outside in the front view emits light with lower luminance than a peripheral light emitting surface of the light guide disposed inside. For headlamps.   The vehicle headlamp according to any one of claims 1 to 4, wherein the peripheral light-emitting unit is caused to emit light by a dedicated light source different from the light source.   The vehicular headlamp according to claim 5, wherein the dedicated light source is disposed along an outer periphery of the peripheral light emitting unit.

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