CN109578932B

CN109578932B - Vehicle lamp

Info

Publication number: CN109578932B
Application number: CN201811119387.7A
Authority: CN
Inventors: 金森昭贵; 中林政昭; 伏见美昭
Original assignee: Koito Manufacturing Co Ltd
Current assignee: Koito Manufacturing Co Ltd
Priority date: 2017-09-28
Filing date: 2018-09-25
Publication date: 2021-10-29
Anticipated expiration: 2038-09-25
Also published as: CN109578932A; JP6913589B2; JP2019061913A; CN209445281U

Abstract

The invention provides a vehicle lamp, which can restrain or solve the problems caused by the analog lighting of the lamp unit in a composite headlamp comprising a high beam unit and a low beam unit. In a composite Headlamp (HL) at least comprising a low beam lamp unit (1L) and a high beam lamp unit (1H), the high beam lamp unit (1H) is provided with a light accumulation body, and the low beam lamp unit (1L) is not provided with the light accumulation body. The appearance design of the Headlamp (HL) is improved by performing simulated lighting on the high beam unit (1H) which is turned off during low beam light distribution, and the problems of forgetting to turn off the headlamp, delaying to change into a full black state and the like caused by the simulated lighting are solved.

Description

Vehicle lamp

Technical Field

The present invention relates to a lamp for a vehicle such as an automobile, and more particularly to a lamp for a vehicle which performs simulated lighting of the lamp by storing light.

Background

In a composite type lamp in which a plurality of lamp units are built in one housing, for example, a composite type headlamp in which a high beam unit and a low beam unit are built in, when only the low beam unit is turned on, an appearance in which only a region of the low beam unit is brighter and a region of the high beam unit is darker is presented when the headlamp is viewed, and there is room for improvement in design of the headlamp.

Therefore, a technique has been proposed in which a light storage body is provided in a part of a lamp unit, and pseudo lighting is performed using light stored in the light storage body (here, the lamp is in a state as if it were being lighted). In the lamp unit of patent document 1 in which the LED mounted on the base plate is used as a light source, a light storage body is disposed in the vicinity of the base plate and the reflector, and when the lamp unit is not lit, the lamp is artificially lit by using light emitted from the light storage body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-149157

Disclosure of Invention

Problems to be solved by the invention

The inventors of the present invention have studied and found that the following problems may occur when the technique of patent document 1 is applied to a composite type headlamp including a high beam unit and a low beam unit, that is, when the headlamp is configured by the high beam unit and the low beam unit each including a light accumulating body.

As one of the problems, when the light accumulating body is provided in the low beam unit, the amount of accumulated light in the light accumulating body increases because the lighting time of the low beam unit is long, and the pseudo lighting time of the low beam unit when the headlight is turned off, that is, when the low beam unit is turned off, becomes long. If the simulated lighting time of the low beam unit is normalized, the driver may forget to turn off the headlights without confirming whether the headlights are turned off.

As another problem, although the presence of the light storage body can prevent the headlight from being instantly darkened when the headlight is turned off, in the opposite sense, when the front of the vehicle is intended to be quickly darkened, the headlight cannot be immediately darkened by the pseudo lighting. In particular, in the low beam unit, the time required for the pseudo lighting is likely to be long as described above, and therefore, a driver who desires to be quickly darkened may feel unpleasant.

The invention aims to provide a vehicle lamp which is a composite type vehicle lamp comprising a high beam unit and a low beam unit, and can improve appearance design and simultaneously restrain or solve problems caused by simulated lighting.

Means for solving the problems

The present invention is a composite type vehicle lamp including at least a low beam lamp unit and a high beam lamp unit, wherein the high beam lamp unit includes a light accumulator, and the low beam lamp unit does not include the light accumulator. The present invention is applied to a composite headlamp in which the high beam unit and the low beam unit are turned on when high beam distribution is performed, and the low beam unit is turned on and the high beam unit is turned off when low beam distribution is performed.

In a preferred embodiment of the present invention, the high-beam unit is provided with a light-storing body in a portion corresponding to the high-beam unit. Alternatively, the low beam lamp unit and the high beam lamp unit are each configured as an independent lamp unit, and the high beam lamp unit is provided with a light accumulator.

Effects of the invention

According to the present invention, while the effect of the design of the headlight as the vehicle lamp can be improved, problems caused by the pseudo lighting when the headlight is turned off, such as forgetting to turn off the headlight due to normalization of the pseudo lighting of the low beam unit or the lamp not immediately turning to a dark state when the headlight is turned off, can be suppressed or prevented.

Drawings

Fig. 1 is an external view of a first embodiment of a headlamp to which the present invention is applied.

Fig. 2 is an exploded perspective view of the lamp unit according to the first embodiment.

Fig. 3 is a longitudinal sectional view of the high beam unit of the first embodiment.

Fig. 4 is a perspective view of the light storing and radiating body as viewed from below.

Fig. 5 is a schematic front view of the lighting state of the headlamp of the first embodiment.

Fig. 6 is a schematic front view of a headlamp of the second embodiment.

Fig. 7 is a longitudinal sectional view of the high beam unit of the second embodiment.

Fig. 8 is a schematic front view of the lighting state of the headlamp of the second embodiment.

Description of the reference numerals

HL: headlamps (vehicle lamps); 1: a lamp unit; 1H: a high beam unit; 1L: a low beam light unit; 2: a lamp shade; 11: a substrate; 12: a reflector; 12H: a reflector for high beam; 12L: a reflector for low beam; 13: a light source unit; 15: a heat sink; 16: a light-storing heat-dissipating body; 21: a unit base; 22: an LED; 23: a reflector; 24: a projection lens; 26: a light storage body; 122: a reflection section; 161: a heat dissipation plate; 162: a light storage body; 133: an LED.

Detailed Description

(first embodiment)

Next, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is an external perspective view of a left headlamp HL of an automobile to which the present invention is applied. As shown in fig. 1, a reflector-type lamp unit 1 is incorporated in a lamp housing 2 of a left headlamp HL mounted on a left front portion of a vehicle body of an automobile. The lamp unit 1 is integrally constituted by a high beam unit 1H and a low beam unit 1L, and thus the headlamp 1 is constituted as a composite type headlamp including the two

lamp units

1H and 1L. The right headlamp and the left headlamp HL, which are not shown, are formed to be symmetrical to each other, but have substantially the same basic configuration.

Fig. 2 is a partially exploded perspective view of the lamp unit 1 incorporated in the headlamp HL. In fig. 1 and 2, the lamp unit 1 has a block-shaped base body 11 whose front surface 111 is formed in a step shape in the left-right direction. The stepped shape of the front surface 111 of the base 11 is configured such that the front surface 111 is stepped rearward toward the outside in the vehicle width direction of the automobile, that is, toward the right side when viewed from the front in the case of the left headlamp HL. In the following, front-back, left-right, and up-down refer to directions based on the automobile, in other words, directions based on the lamp unit 1 and the headlamp HL.

A reflector 12 is supported on the front surface 111 of the base 11. The reflector 12 is composed of both a high beam reflector 12H and a low beam reflector 12L which are formed separately. The high beam reflector 12H constituting the high beam unit 1H has four reflection portions 122 arranged in parallel in the left-right direction, and the low beam reflector 12L constituting the low beam unit 1L has five reflection portions 122 arranged in parallel in the left-right direction. Hereinafter, each of the reflectors for high beam and low beam may be simply referred to as a reflector.

The support portion 121 is formed in a substantially plate shape, and a rectangular light-transmitting window 124 having a predetermined size is opened in the vertical direction at a plurality of portions corresponding to the plurality of reflection portions 122. The light source unit 13 is attached to the support unit 121 so as to cover the upper side thereof. The light source unit 13 includes a light source substrate 131, and an LED133 as a light source is mounted on a lower surface of the light source substrate 131. Further, a heat sink 15 is laminated on the upper surface of the light source substrate 131 via a heat conductive sheet 14.

Fig. 3 is a longitudinal sectional view of one reflection unit 122 of the high beam unit 1H, and is substantially the same as the low beam unit 1L. The illustration of the substrate 11 is omitted. The reflector 12 (the high beam reflector 12H and the low beam reflector 12L) includes a support portion 121 for supporting the light source, and a parabolic reflection portion 122 extending from the support portion 121 toward the front of the lamp and obliquely below the lamp. The reflector 12 is formed by resin molding, and a light reflecting surface is formed by forming a metal film 123 having light reflectivity such as aluminum on the front surface of the reflecting portion 122 by vapor deposition or the like. The support portion 121 has a structure in which a plurality of rectangular frames corresponding to the respective reflection portions 122 are arranged in parallel, and the light transmission windows 124 are formed in the respective frames.

A plurality of chip-shaped LEDs 133 are mounted on the lower surface of the light source substrate 131 by surface mounting so as to correspond to the plurality of reflection units 122. Here, one LED133 is mounted on one reflection unit 122. In addition, a solder resist 134 for protection is applied to a region of the lower surface of the light source substrate 131 where the LED133 is not mounted.

The light emitting surface of the LED133 faces downward, and when the light source substrate 131 is mounted on the support portion 121 of the reflector 12, the LED133 is disposed at a position facing the light transmitting window 124 of the corresponding support portion 121. When the LEDs 133 emit light, the light is emitted downward of the light source substrate 131, passes through the corresponding light-transmitting windows 124, and then is directed toward the corresponding reflection portions 122.

The reflecting portion 122 of the reflector 12 is formed as a paraboloid having the LED133 disposed correspondingly as a focal point, and reflects the light emitted from the LED133 toward the front of the lamp. The respective reflection portions 122 are designed to have substantially the same shape, but the size and shape of the respective reflection portions 122 are different in order to form a desired light distribution required for the lamp unit 1. In particular, the reflection portions 122 of the high beam reflector 12H and the low beam reflector 12L are formed in different shapes so as to form predetermined light distributions, respectively.

A plate-shaped light storing and radiating body 16 is disposed between the LEDs 133 and the reflection portion 122 of the reflector 12 on the lower surface side of the light source 13, that is, on the lower surface side of the light source substrate 131, and between the lower surface of the light source substrate 131 and the support portion 121 of the reflector 12. The light-storing and heat-radiating body 16 includes a heat radiation plate 161 extending in the range of the two regions of the high beam unit 1H and the low beam unit 1L. A rectangular opening 163 is opened in a portion of the heat dissipation plate 161 corresponding to the support portion 121, in other words, a portion corresponding to each LED133 mounted on the light source substrate 131. The opening 163 is formed to have a size smaller than that of the light transmitting window 124 formed in the support portion 121.

The heat dissipation plate 161 is formed of a material having a thermal conductivity at least greater than that of air. That is, since the thermal conductivity of air is 0.02W/m.k, any material having a thermal conductivity of more than 0.02W/m.k may be used. When the solder resist 134 for circuit protection is formed on the lower surface of the light source substrate 131 as described above, the heat sink 161 is preferably formed of a metal plate of aluminum, copper, or the like having a thermal conductivity greater than that of the solder resist 134, for example, greater than 0.17W/m · k.

In addition, as shown in a perspective view when the light-storing and heat-radiating body 16 is viewed from below in fig. 4, a portion of the heat radiation plate 161 extending in the region of the high beam unit 1H is coated with a light-storing body 162 on its lower surface. On the other hand, the portion extending in the region of the low beam lamp unit 1L is not coated with the light accumulation body. That is, the light accumulator 162 is formed only in the region of the high beam unit 1H, in other words, the region corresponding to the reflection portion 122 of the high beam reflector 12H. Therefore, the longitudinal sectional structure of the low beam lamp unit 1L is a structure in which the light accumulator 162 is removed from the sectional structure of the high beam lamp unit 1H shown in fig. 3.

According to the lamp unit 1 of the first embodiment, when the headlamp HL is turned on with the high beam light distribution, that is, when the low beam lamp unit 1L and the high beam lamp unit 1H are simultaneously turned on, light emitted downward from each LED133 that emits light is reflected forward by the corresponding reflection portion 122 of the reflector 12, and is irradiated to the front area of the automobile through the transparent cover of the cover 2, as indicated by the solid line in fig. 3. The lights from the respective reflection portions 122 overlap each other in a region in front of the headlamp HL, thereby forming a light distribution that illuminates a desired region in front of the automobile.

When the low beam unit 1L and the high beam unit 1H are simultaneously turned on in this way, the light reflected by the reflection portion 122 of the reflector 12 is superimposed to form high beam light distribution. When only the low beam lamp unit 1L is turned on, only the light reflected by the reflection portion 122 of the low beam reflector 12L is superimposed to form low beam light distribution.

Here, when the high beam unit 1H is turned on, a part of the light emitted from the LEDs 133 is irradiated on the light accumulating body 162 and is stored in the light accumulating body 162. When the low beam lamp unit 1L is turned on, a part of the light emitted from the low beam lamp unit 1L is also irradiated on the light accumulating body 162 by, for example, reflection in the globe 2, and in this case, light accumulation is also performed. However, the light stored in the light accumulator 162 based on the low beam lamp unit 1L is not so much.

When the high beam unit 1H and the low beam unit 1L are turned on, a part of the heat generated by the light emission of the LEDs 133 is conducted from the light source substrate 131 to the heat sink 15 through the heat transfer sheet 14, and is radiated therefrom. In addition, another part of the generated heat is radiated and conducted from the LEDs 133 to the light-storing and heat-radiating body 16 directly or via the solder resist 134 of the light source substrate 131. Since the heat conductivity of the heat dissipating plate 161 of the light storing and heat dissipating body 16 is larger than that of air as described above, the radiated heat is diffused to the heat dissipating plate 161 and dissipated from the heat dissipating plate 161. This improves the heat radiation effect of the LEDs 133, and prevents the light emission characteristics of the LEDs 133 from being degraded, thereby making it possible to obtain a headlamp having a high illumination effect.

On the other hand, in the case of low beam light distribution, that is, when the low beam lamp unit 1L is turned on and the high beam lamp unit 1H is turned off, the light accumulating body 162 for accumulating light at the time of lighting emits light in the high beam lamp unit 1H as indicated by a broken line in fig. 3, and the light passes through the light transmitting window 124, is reflected by the reflecting portion 122, and is irradiated forward. That is, the high beam unit 1H is in the pseudo-lighting state.

As shown in a schematic diagram of the headlamp HL in fig. 5 (a), the high beam unit 1L brightly emits light in the region thereof and the high beam unit 1H brightly emits light in the region thereof, due to the pseudo lighting of the high beam unit 1H. In fig. 5, the dotted area represents a dark area. As a result, as compared with the case where only the low beam lamp unit 1L is turned on, the brightness of the entire headlamp HL can be increased to improve the visibility of the front region, and the design of the headlamp HL can be improved. In addition, by making the entire headlamp HL have a bright appearance by the lighting of the low beam lamp unit 1L and the pseudo lighting of the high beam lamp unit 1H in this manner, the presence of the vehicle can be easily recognized by other vehicles and pedestrians, and this is also preferable from the viewpoint of traffic safety.

Incidentally, in the headlamp having no light accumulator 162 in the high beam unit 1H, the illumination by the light emitted from the LEDs 133 of the high beam unit 1H is terminated at the time of low beam light distribution, that is, at the time of turning off the high beam unit 1H. Therefore, as shown in fig. 5 (b), the headlight HL is illuminated only by the low beam lamp unit 1L, and visibility of the front region is reduced. When the headlamp HL is viewed from the front, the region outside the headlamp HL in the vehicle width direction looks dark and is difficult to recognize by other vehicles and the like, and there is still a problem in terms of appearance design.

In the first embodiment, when the headlamps HL are turned off, that is, when the low beam lamp unit 1L is turned off, although the area of the low beam lamp unit 1L is darkened, the high beam lamp unit 1H is turned on in an analog manner, and therefore, the front of the host vehicle can be prevented from becoming dark instantaneously. On the other hand, since the brightness at this time is darker than when the low beam lamp unit 1L is turned on, the driver can confirm whether or not the headlamps are turned off, and thus can not forget to turn off the headlamps. Further, when the high beam unit 1H is turned on, it is less likely to be turned on for a long time, and the amount of light stored in the light storage body during the lighting is not so large, so that even when the analog lighting is performed, the headlamp HL can be turned off in a short time to turn the headlamp HL into a dark state.

(second embodiment)

Fig. 6 is a schematic front view of a headlamp of the second embodiment. An example of a left headlamp of an automobile is shown in the same manner as in the first embodiment, and the same reference numerals are given to the same portions as those in the first embodiment. A plurality of independent lamp units are arranged in the lamp cover 2 to form a composite type headlamp HL. Here, the blinker unit 1C, the low beam unit 1L, the high beam unit 1H, and the turn lamp unit 1T are arranged from the inside in the vehicle width direction.

Fig. 7 is a longitudinal sectional view of the high beam unit 1H. The high beam unit 1H includes a unit base 21 that is fixedly supported in the globe 2 and also serves as a heat sink, and an LED22 serving as a light source is mounted on an upper surface of the unit base 21. A dome-shaped reflector 23 is attached to the unit base 21 so as to cover the upper side of the LED 22. Further, a projection lens 24 is disposed in front of the reflector 23, and the projection lens 24 is attached to the unit base 21 via a lens holder 25.

The projection lens 24 has a circular front shape when viewed from the front, and a flange 241 is integrally formed on the circumference thereof. The flange 241 is attached to the unit base 21 via the lens holder 25. Further, in an annular portion of the flange 241 not covered with the lens holder 25, a light storage body 26 is formed on a rear surface of the projection lens 24. The light storage body 26 is formed in a ring shape by, for example, applying a light storage material to the back surface of the flange 241.

The low beam unit 1L has a configuration in which a part of the components, such as the shape of the reflector 23 and the shape of the projection lens 24, is different from the configuration of the high beam unit 1H, but the basic configuration is substantially the same, and therefore, the illustration thereof is omitted. On the other hand, in the low beam lamp unit 1L, the light accumulator 26 formed on the flange 241 of the projection lens 24 of the high beam lamp unit 1H is not provided.

The above-described indicator light unit 1C and the turn light unit 1T are not particularly characterized in the present invention, and therefore detailed description thereof is omitted here.

When the vehicle lamp is turned on, the headlight HL of the second embodiment is subjected to lighting control in three modes: only the small lighting of the wide light 1C is lighted; turning on the low beam light distribution mode of the low beam light unit 1L on this basis; and further turns on the high beam light distribution system of the high beam unit 1H on this basis. The turn signal lamp 1T blinks independently of the lighting and non-lighting of the lamp unit.

In the high beam light distribution, the high beam unit 1H and the low beam unit 1L are simultaneously turned on. In each of the

lamp units

1H and 1L, as shown by a solid line in fig. 7, light emitted from the LED22 is reflected by the reflector 23 and is irradiated toward the front of the automobile through the projection lens 24. The low beam unit 1L and the high beam unit 1H are superimposed on each other to illuminate with a predetermined high beam distribution.

At this time, in high beam unit 1H, part of the light emitted from LED22 is irradiated onto light storage body 26 directly or after being reflected by reflector 23, and is stored in light storage body 26. Although not shown, the light storage body 26 may store light by reflecting a part of light when the low beam lamp unit 1L is turned on inside the globe 2 or by sunlight in the daytime. However, the amount of light stored in light storage body 26 in the above manner is not much as compared with the light storage by high beam unit 1H.

In the low beam light distribution, the low beam light unit 1L is turned on, and the high beam light unit 1H is turned off. By turning on the low beam lamp unit 1L, as in the case of the high beam lamp unit 1H shown in fig. 7, the light emitted from the LED22 is reflected by the reflector 23, is irradiated forward of the automobile through the projection lens 24, and is illuminated with a predetermined low beam distribution by the irradiation light of the low beam lamp unit 1L.

At this time, although the high beam unit 1H is turned off, the light-accumulating body for accumulating light is made to emit light when the high beam unit 1H is turned on or during the daytime, and the light causes the flange 241 of the projection lens 24 to be in a light-emitting state. Thus, the high beam unit 1H is in a pseudo-lighting state in which the flange 241 of the projection lens 24 serves as a light source and emits light in a ring shape. As a result, as shown in fig. 8 (a), the headlight HL has an appearance in which a region from the low beam unit 1L to the high beam unit 1H brightly emits light.

By this simulated lighting of the high beam unit 1H, the brightness of the headlamps HL can be increased and visibility of the front region can be improved as compared with the case where only the low beam unit 1L is turned on. In addition, when the headlamp HL is viewed from the front of the automobile, the headlamp HL as a whole presents a bright appearance by the lighting of the low beam lamp unit 1L and the pseudo lighting of the high beam lamp unit 1L, so that the presence of the own vehicle is easily recognized by other vehicles and pedestrians, and this is also preferable in terms of traffic safety. Further, by the pseudo lighting, the light emitting surface of the headlamp HL can be made to have substantially uniform brightness, and the design can be improved. Incidentally, fig. 8 (b) shows a state in which the high beam unit 1H is not turned on in a simulated manner, and the outer region of the headlamp HL in the vehicle width direction is dark.

When the headlamps HL are turned off, that is, when the low beam lamp unit 1L is turned off, the high beam lamp unit 1H is not instantaneously dimmed because the high beam lamp unit 1H is artificially turned on, although the region of the low beam lamp unit 1L is dimmed, as in the first embodiment. Since the brightness at this time is darker than when the low beam lamp unit 1L is turned on, it can be easily determined whether or not the headlamp HL is being turned on, and thus the headlamp HL cannot be forgotten to be turned off. Since the time for the analog lighting of the high beam unit 1H is short, the analog lighting can be ended in a short time to change to the dark state.

In the second embodiment, if the low beam lamp unit is turned on, the light storage body may be provided in a high beam lamp or a turn signal lamp in addition to the high beam lamp unit of the second embodiment. In this way, when only the low beam lamp unit is turned on, the lamp unit can be turned on in a simulated manner, and visibility of the headlight and visibility of the other vehicle or the like to the host vehicle can be improved.

The light accumulator of the second embodiment may be formed in other portions of the high beam unit. For example, the light accumulator may be formed locally on the circumference of the flange of the projection lens, or intermittently along the circumference of the flange. The light-storing body may be formed in a part of the light-reflecting surface of the reflector of the high beam unit, or in a part or the entire region of the non-light-reflecting surface.

The light storage body in the first and second embodiments preferentially selects a light storage body that stores white light or light of a color close to white and emits light, but is not limited to such a light storage body, and a light storage layer that emits light with arbitrary color light may be selected. Thus, the lamp unit or the headlight has an appearance that is pseudo-lighted with the colored light, and the design of the headlight at the time of pseudo-lighting can be improved.

The present invention is applicable to a composite type lamp including a plurality of lamp units, and particularly can achieve the object by performing pseudo lighting on a lamp unit including a high beam unit that is not lit simultaneously with a low beam unit when the low beam unit is lit, and therefore, the configuration of the plurality of lamp units and the lamp unit constituting the lamp, and the configuration of the lamp unit and the unit portion provided with a light accumulator are not limited to the configurations of the first embodiment and the second embodiment.

Claims

1. A vehicular lamp configured as a composite type including at least a low beam lamp unit and a high beam lamp unit, characterized in that,

the high beam unit is provided with a light accumulator, the low beam unit is not provided with a light accumulator,

the high beam unit and the low beam unit are turned on when high beam light distribution is performed, the low beam unit is turned on and the high beam unit is turned off when low beam light distribution is performed,

the high beam unit becomes an analog lighting state by the light stored in the light accumulating body when it is turned off itself,

the high beam unit and the low beam unit are formed separately and arranged side by side in the left and right direction of the vehicle.

2. The vehicular lamp according to claim 1,

the light accumulator stores at least light emitted by the high beam unit.

3. The vehicular lamp according to claim 1 or 2,

the vehicle lamp is configured as one lamp unit in which the low beam lamp unit and the high beam lamp unit are integrally formed, and a light storage body is provided in a portion of the one lamp unit corresponding to the high beam lamp unit.

4. The vehicular lamp according to claim 1 or 2,

the dipped headlight unit and the high beam unit are each configured as an independent lamp unit, and a light accumulator is provided in the high beam unit.

5. The vehicular lamp according to claim 3,

the vehicle lamp further includes at least one other lamp unit different from the low beam lamp unit and the high beam lamp unit, and at least one of the other lamp units includes a light storage body.

6. The vehicular lamp according to claim 4,

7. The vehicular lamp according to claim 1 or 2,

the high beam unit and the low beam unit each have a reflector including a support portion for supporting the light source and a parabolic reflection portion extending from the support portion toward the front of the vehicle lamp and toward the lower side of the vehicle lamp in an inclined state, and the light accumulation body is formed in a region corresponding to the reflection portion of the high beam unit.

8. The vehicular lamp according to claim 1 or 2,

the high beam lamp unit and the low beam lamp unit each have a dome-shaped reflector and a projection lens provided in front of the reflector, the projection lens having a flange formed thereon, the light accumulator being formed on a surface of the flange on a side close to the reflector.