JP4125035B2 - Automotive headlamps - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive headlamp that reflects light emitted from a light source by a rear main reflector and distributes the light. For example, the effective reflecting surface of the main reflector cannot be sufficiently taken into account in relation to the shape of the vehicle body. The present invention relates to an automotive headlamp that is effective in increasing the light distribution, for example, by providing a sub-reflector to compensate for the shortage of light.
[0002]
[Prior art]
An automotive headlamp is a lamp that is attached to a vehicle front-end corner and illuminates the front of the vehicle widely, and mainly includes a light source and a main reflector that is behind the light source and reflects light emitted from the light source forward. Configured.
[0003]
However, in recent automotive headlamps, the design is emphasized, and the front cover constituting the front of the headlamp tends to be formed into a three-dimensional streamlined shape following the shape of the vehicle body. For this reason, the shape of the reflector that creates the optical system necessary for the light distribution of the headlamps is restricted, and a necessary solid angle cannot be obtained, for example, the light distribution to the side may be insufficient.
[0004]
In addition, in recent years when opportunities for elderly people to drive have increased, the current light distribution standard for headlamps is not preferable. That is, if it is noticed after approaching a side pedestrian or obstacle, it may be too late and lead to an accident. For example, the visibility is not sufficient for an elderly driver who is slow to respond.
[0005]
Therefore, as such a countermeasure, a structure in which a sub-reflector is provided to increase the amount of light of the headlamp is conceivable. As conventional techniques, U.S. Pat. No. 4,772,987, U.S. Pat. No. etc. are known.
[0006]
The first prior art (US Pat. No. 4,772,987) attempts to increase the amount of light by expanding the sub reflector below the main reflector. The second prior art (US Pat. No. 4,587,601) provides a reflecting surface (sub-reflector) on the inner side of a shade arranged in front of the light source, and reflects the reflected light from the sub-reflector with the main reflector. I am trying to improve. In the third prior art (Japanese Utility Model Laid-Open No. 3-4402), a sub-reflector is provided in front of the left and right sides of the light source to increase the amount of light.
[0007]
[Problems to be solved by the invention]
However, in the first prior art described above, since the main reflector is expanded to the outside, the headlamp is increased in size and does not conform to the recent design (downsizing and narrowing). The second prior art does not mention at all how to specifically improve the light distribution. In the third prior art, the reflected light (light parallel to the optical axis of the headlamp) from the parabolic main reflector and sub-reflector is diffused by a front lens diffusion step (generally a fisheye step). Therefore, it is only mentioned that the light distribution standard of the conventional headlamp is satisfied, and there is no mention of a configuration that positively increases the light distribution to the side of the vehicle.
[0008]
That is, as a result of examination by the inventor, all of the conventional headlamps equipped with the sub-reflector were proposed on the assumption that the current light distribution standard should be satisfied. When considering measures for aging, the light distribution from the front to the side was insufficient, and it was found that there was a need for improvement.
[0009]
Therefore, the inventor configures an effective reflection surface so that light distribution can be controlled from the front to the side of the vehicle body alone without performing light distribution control with the front lens, and the light source is directed to the main reflector (effective reflection surface). A sub-reflector is provided near the light source that does not interfere with the light, or slightly diagonally to the front, and the prototype is designed considering the configuration where the optical axis of the sub-reflector is substantially perpendicular to the optical axis of the main reflector. Since it has been confirmed that the light intensity is greatly increased and a light distribution with good visibility can be obtained even for an elderly driver, the present invention has been proposed.
[0010]
The present invention was made based on the problems of the prior art and the above-mentioned knowledge of the inventor, the purpose of which can substantially satisfy the light distribution standard as a headlamp by the reflected light from the main reflector, The reflected light from the small sub-reflector provided near the light source increases the overall light distribution of the headlamps and increases the driver's viewing distance on the side and front, making it more secure The object is to provide a new automotive headlamp.
[0011]
[Means and Actions for Solving the Problems]
In order to achieve the above object, in the automotive headlamp according to claim 1, a light source, a main reflector disposed behind the light source and reflecting light emitted from the light source forward, and the light source A front cover disposed in front and a small sub reflector that is disposed slightly forward of the light source and reflects light emitted from the light source mainly to the side. In the car headlight ,
The light source comprises a discharge bulb, The sub-reflector has an optical axis substantially orthogonal to the optical axis of the main reflector. And a cap-type sub-reflector housing having a pair of left and right effective reflecting surfaces provided below the optical axis of the main reflector and extending forward and backward across the optical axis, and rearward from the sub-reflector housing An L-shaped leg portion that extends and is attached to the lower portion of the main reflector, and a direct-shade formed on a substantially upper half of the front surface of the sub-reflector housing It was configured as follows.
[0012]
(Operation) The small sub-reflector arranged in front of the light source does not block the light from the light source toward the main reflector (the effective reflection surface) and the light reflected by the main reflector (the effective reflection surface). A first light distribution pattern having a light amount close to the current standard of the headlamp is formed by the reflected light. Moreover, the light which goes to other than the main reflector (its effective reflection surface) is reflected by the sub-reflector (its effective reflection surface), and the 2nd light distribution pattern which supplements a 1st light distribution pattern is formed. In particular, since the optical axis of the sub-reflector (its effective reflection surface) is substantially perpendicular to the optical axis of the main reflector (its effective reflection surface), the second light distribution pattern mainly contributes to the lateral light distribution. That is, most of the light source light is reflected from the front to the side by the main reflector to form a first light distribution pattern close to the current standard of the headlamp, and a part of the light emitted obliquely forward in the left-right direction from the light source Is reflected by the sub-reflector to form a second light distribution pattern that spreads widely from the front to the side, and by combining both light distribution patterns, the light distribution of the entire headlamp (from the front to the side of the vehicle) ) And the driver's viewing distance from the front to the side of the vehicle is extended. In addition, when the solid angle of the main reflector optical system cannot be increased due to the shape of the lamp chamber or the like and the light distribution amount of the main reflector is insufficient, the reflected light from the sub reflector compensates for the insufficient light distribution amount of the main reflector.
[0013]
According to a second aspect of the present invention, in the automotive headlamp according to the first aspect, the effective reflection surface of the main reflector is formed of a free curved surface or a composite reflection surface that forms a predetermined light distribution, and the front cover is The lens step for light distribution control is not provided and is configured to be non-step.
(Operation) Light distribution control as a headlamp (for example, light distribution control for forming a passing beam) is not performed by the light distribution control step of the front lens, but the effective reflection surface (curvature of the curvature) of the main reflector. Since a plurality of different reflecting surfaces are formed by a continuous free-form surface or a composite reflecting surface), a non-step front cover without a light distribution control step can be placed on the front of the headlamp. Through the cover, the interior of the lamp can be seen through the mirror color, giving the headlight a sense of depth.
[0014]
In Claim 3, The automotive headlamp of Claim 1 or 2 WHEREIN: As for the effective reflective surface of the said sub reflector, the parabolic column curved surface in which reflected light diffuses, or the elliptical curved surface in which reflected light diffuses after condensing It was made to consist of.
(Operation) The reflected light on the parabolic curved surface is diffused and distributed from the front to the side of the vehicle. The reflected light on the elliptic curved surface is once condensed and then diffused and distributed from the front of the vehicle to the side.
[0015]
According to Claim 4, in the automotive headlamp according to any one of Claims 1 to 3, the front cover of the headlamp largely wraps around from the front to the side of the vehicle body, and is three-dimensional following the streamlined shape of the vehicle body It was configured to form a streamlined shape.
(Operation) Since the front cover is formed in a three-dimensional streamline shape that largely turns from the front to the side of the vehicle body following the streamline shape of the vehicle body, the length of the effective reflection surface of the main reflector on the left and right of the light source is different (from the light source The left and right width of the effective reflecting surface outside the vehicle width direction is smaller than the left and right width of the effective reflecting surface inside the vehicle width), and the light distribution by the main reflector (particularly the side of the vehicle) due to the small solid angle of the main reflector optical system The amount of light distributed by the sub-reflector compensates for this.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described based on examples.
[0017]
1 to 6 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an automotive headlamp according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view of the headlamp. 3 shows a main reflector, (a) is a perspective view of a sub-reflector, (b) is a vertical cross-sectional view of the sub-reflector, (c) is a cross-sectional view of the sub-reflector, and FIG. 4 is a main reflector. The horizontal sectional view which shows the optical path of the light reflected by the effective reflective surface and subreflector's effective reflective surface, (a) is a horizontal sectional view of the left headlamp, (b) is a horizontal sectional view of the right headlamp It is. 5A and 5B are diagrams showing the light distribution pattern of the headlamp on the screen, where FIG. 5A is a light distribution pattern of the left headlamp, FIG. 5B is a light distribution pattern of the right headlamp, and FIG. The combined light distribution pattern of the headlamp is shown. FIG. 6 is a view showing a light distribution pattern of the headlamp on the road surface, and corresponds to FIG.
[0018]
As shown in FIGS. 1 and 2, the headlamp in the present embodiment (the left side when viewed from the driver, that is, the right side when viewed from the front of the automobile) is a front opening of a container-shaped synthetic resin lamp body 12. A transparent front cover 14 is assembled to define a lamp chamber S, and a light source unit U1 for forming a low beam is accommodated in the lamp chamber S. The light source unit U1 is provided so as to be tiltable in the vertical and horizontal directions by an aiming mechanism (not shown). The lamp optical axis (the optical axis of the main reflector 20) L1 is operated in the vertical and horizontal directions by operating the aiming mechanism. It can be adjusted to tilt. Further, the headlamp is formed in a shape following the streamline type B of the front end corner portion of the vehicle body formed in a streamline shape having a small curvature when viewed from either the plane or the side surface, The front cover 14, that is, the front surface of the lamp chamber S is formed in a streamlined shape that greatly wraps around three-dimensionally from the front to the side of the vehicle body.
[0019]
The light source unit U1 has a structure in which a discharge bulb 30 as a light source and a sub-reflector unit 40A are mounted and integrated on the main reflector 20 having an effective reflection surface 22 formed on the front side. The bulb 30 inserted into the provided bulb insertion hole 13 extends in front of the effective reflection surface 22.
[0020]
The discharge bulb 30 is a discharge bulb referred to as a model name D2S or D2R used as a light source of an automobile headlamp, and has a structure in which an arc tube 32 made of quartz glass or the like extends in front of an insulating plug 31 and has an arc. A pair of electrodes is provided approximately at the center in the longitudinal direction of the tube 32, and Hg, NaI, ScI. ₃ A sealed glass sphere 33 is provided as a discharge light emitting part in which a light emitting material such as the above is enclosed together with a rare gas. And in the state which inserted the discharge bulb 30 in the reflector 20, the discharge axis of the arc tube 32 becomes a form which corresponded with the optical axis (optical axis of the main reflector 20) L1 of a lamp | ramp. Reference numeral 36 denotes a lighting circuit that starts discharge by applying a high voltage to the discharge bulb 30 (between the opposing electrodes), and a ballast circuit that continues stable discharge to the discharge bulb 30 (between the opposing electrodes). The output cord 37 led out from the lighting circuit / ballast circuit unit 36 into the lamp body 12 is connected to the rear end portion of the discharge bulb 30 via the connector 38. .
[0021]
The effective reflecting surface 22 of the main reflector 20 is provided so as to surround the arc tube 32 that is a light source. However, as described above, the lamp chamber S (front cover 14) is configured to largely wrap around to the side. As shown in FIG. 2, the main reflector 20 extending along the inside of the body 12 has an effective reflection surface whose inner side in the vehicle width direction is longer than the valve insertion hole 13. Although it is shorter than the surface 22a (the left-right width of the effective reflecting surface 22b is smaller than the left-right width of the effective reflecting surface 22a), it is difficult to obtain a sufficient solid angle in the main reflector reflecting optical system. In the example, the following structure compensates for the insufficient light distribution due to insufficient solid angle, and the light distribution larger than that of the conventional headlamp. Resulting in an improvement in visibility of the driver toward the side is achieved from the front of the vehicle.
[0022]
That is, first, the effective reflection surface 22 is formed of a free curved surface or a composite reflection surface for light distribution control in which a plurality of reflection surfaces having different curvatures are continuous or aggregated, and the light reflected by the effective reflection surface 22. Is diffused over a wide area from the front to the side of the vehicle, and a light distribution close to the current light distribution standard of the headlamp is obtained. Specifically, most of the light emitted from the sealed glass bulb 33 which is the discharge portion of the bulb 30 (light emitted from the discharge center C to the outer periphery of the arc tube and obliquely rearward) is directed to the effective reflection surface 22 (22a, 22b) of the main reflector 20. 1 and is diffusely reflected from the front side of the vehicle to the side as shown in FIGS. L. The first light distribution pattern P1 for the passing beam is formed (see FIG. 5A).
[0023]
Secondly, as shown in FIGS. 1 and 2, a sub reflector unit 40A made of aluminum is generally disposed so as to cover the front of the bulb 30, and the sub reflector unit 40A (effective reflection surfaces 43a and 43b) A portion of the light that travels obliquely forward from the sealed glass sphere 33 that is the discharge portion of the bulb 30 (light that travels from the discharge center C to other than the effective reflection surface 22 of the main reflector 20) is reflected to be formed by the main reflector 20. A light distribution (second light distribution pattern P21, P22) that supplements the light distribution (first light distribution pattern P1) is formed (see FIG. 5A).
[0024]
As shown in FIG. 3, the sub-reflector unit 40A includes a cap-type sub-reflector housing 42 having a pair of left and right effective reflecting surfaces 43a and 43b extending forward and backward with the optical axis L1 interposed therebetween, and a sub-reflector housing 42. L-shaped leg portions 47 that extend rearward and are attached to the lower portion of the main reflector 20. The pair of left and right effective reflecting surfaces 43a and 43b are provided below the optical axis L1 of the main reflector 20, and as shown in FIG. 4A, the discharge center C of the discharge bulb 30 is a common first focal point f1 and light. It is composed of ellipsoidal curved surfaces having second focal points f2a and f2b at the left and right front predetermined positions of the axis L1, respectively. And the leg part 47 is fixed to the back side of the reflector 20 by a fixing means such as a screw 48 (see FIG. 1), so that the effective reflection surfaces 43a and 43b have the optical axes L2a and L2b of the main reflector 20 respectively. It is orthogonal to the optical axis L1 (see FIG. 3 (c)), is substantially opposed to the left and right across the optical axis L1 of the main reflector 20 in front of the bulb 30, and extends in parallel along the optical axis L1. Next, it is positioned with respect to the discharge center C of the discharge bulb 30.
[0025]
In addition, the sub-reflector unit 40A discharges the rear edges of the effective reflection surfaces 43a and 43b so as not to block light from the discharge bulb 30 (discharge center C) toward the effective reflection surfaces 22 (22a and 22b) of the reflector 20. It arrange | positions on the straight line which connects the center C and front edge 22a1, 22b1 of the effective reflective surface 22 (22a, 22b) (refer Fig.4 (a)). Furthermore, the sub-reflector unit 40A has a compact size so as not to block the light that is reflected by the effective reflection surface 22 (22a, 22b) of the reflector 20 and contributes to the formation of the first light distribution pattern P1. It is formed in parallel with the axis L1. Reference numeral 44 denotes a direct-light shade formed on substantially the upper half of the front surface of the sub-reflector housing 42 in order to block the direct light emitted forward from the bulb 30 (discharge center C) and prevent the generation of glare light. belongs to.
[0026]
Further, as shown in FIG. 4A, the light emitted obliquely forward and laterally from the bulb 30 (discharge center C) crosses the optical axis L1 in the left-right direction by the effective reflection surfaces 43a and 43b of the sub reflector unit 40A. Thus, light distribution patterns P12 and P22 are formed that are diffusely reflected laterally and distribute light laterally from the front of the vehicle (see FIG. 5A).
[0027]
FIG. 4B is a horizontal sectional view showing an optical path of light reflected by the effective reflection surface of the main reflector and the effective reflection surface of the sub reflector in the right headlamp.
[0028]
In the right headlamp, the lamp body, front cover, light source unit, and sub-reflector unit 40A are configured symmetrically with the left headlamp. Then, most of the light emitted from the discharge center C of the discharge bulb is diffusely reflected by the effective reflection surface 22 (22a, 22b) of the main reflector 20, and as shown in FIG. L. The first light distribution pattern P1 for the passing beam is formed. Further, the light emitted obliquely forward and laterally from the discharge center C is diffusely reflected by the effective reflecting surfaces 43a and 43b of the sub reflector unit 40A and is formed by the main reflector 20 (first light distribution pattern P1). Is distributed (second light distribution patterns P21 and P22) (see FIG. 5B).
[0029]
A light distribution pattern shown in FIG. 5C is formed on the light distribution screen by combining the light distribution patterns of the left and right headlamps. The pattern on the light distribution screen shown in FIG. 5C is formed by sub-reflectors on the left and right sides of the light distribution pattern P1 formed by the main reflector 20 on the road surface in front of the traveling vehicle, as shown in FIG. The second light distribution patterns P21 and P22 overlap each other, and the light distribution is enlarged laterally in the lateral direction, so that light distribution with excellent visibility from the front to the lateral side of the vehicle is obtained.
[0030]
FIGS. 7 to 9 show an automotive headlamp (a headlamp on the left side when viewed from the driver) according to a second embodiment of the present invention. FIG. 7 shows the effective reflecting surface of the main reflector and the effective sub-reflector in the headlamp. 8 is a horizontal sectional view showing an optical path of light reflected by the reflecting surface, FIG. 8 is a longitudinal sectional view of an effective reflecting surface of the sub-reflector, and FIG. 9 is a diagram showing a light distribution pattern on the screen of the headlamp. Is the light distribution pattern of the left headlamp, and (b) is the light distribution pattern of the right headlamp.
[0031]
In the second embodiment, the structure of the sub-reflector unit 40B is the same as that of the first embodiment except for the structure of the sub-reflector unit 40B. The structure of the different sub-reflector unit 40B will be described. The same reference numerals as those in the first embodiment are assigned, and redundant description thereof is omitted.
[0032]
The sub-reflector unit 40A of the first embodiment described above is provided with two effective reflecting surfaces 43a and 43b formed of an ellipsoidal curved surface. However, the sub-reflector unit 40B of the second embodiment includes Only one effective reflecting surface 43c constituted by a parabolic curved surface having an optical axis L2c orthogonal to the optical axis L1 of the main reflector 20 is provided.
[0033]
The effective reflecting surface 43c extends inward of the optical axis L1 in the vehicle width direction in parallel with the optical axis L1, and light emitted diagonally forward rightward from the discharge center C of the discharge bulb 30 is indicated by L23 in FIG. As shown, it is diffusely reflected to the left by the effective reflecting surface 43c of the sub reflector unit 40B. Further, as shown in FIG. 8, for example, the longitudinal section of the effective reflecting surface 43c is a combination of a parabola 43c1 and a hyperbola 43c2 above the optical axis L2c, and an ellipse 43c3 and a parabola below the optical axis L2c. 43c4, and in any case, the reflected light from the effective reflecting surface 43c diffuses downward from the optical axis L1 (horizontal line position H). And the light distribution (second light distribution pattern P23) that supplements mainly the left side of the light distribution (first light distribution pattern P1) formed by the main reflector 20 by the diffuse reflection light of the effective reflection surface 43c. It is formed (see FIG. 9A).
[0034]
FIG. 9B shows a light distribution pattern of the right head lamp provided as a pair with the left head lamp. In the right head lamp, the lamp body, the front cover, the light source unit, and the sub-reflector unit 40B are shown in FIG. The left side lamp shown in FIG.
[0035]
For this reason, in the left headlamp, as shown in FIG. 9B, the light distribution (second light distribution) mainly supplementing the right side of the light distribution (first light distribution pattern P1) formed by the main reflector 20 is provided. A light distribution pattern P23) is formed. Then, the light distribution patterns of the left and right headlamps shown in FIGS. 9A and 9B are combined, the light distribution is expanded in the lateral direction, and the light distribution with excellent visibility from the front to the side of the vehicle is obtained. Is obtained.
[0036]
FIGS. 10 and 11 show an automotive headlamp according to a third embodiment of the present invention. FIG. 10 shows a light beam reflected by the effective reflection surface of the main reflector and the effective reflection surface of the sub-reflector in the headlamp. FIG. 11 is a diagram showing a light distribution pattern on the screen of the headlamp.
[0037]
Also in the third embodiment, the structure of the sub-reflector unit 40C is the same as that of the first embodiment except for the structure of the sub-reflector unit 40C, and the structure of the different sub-reflector unit 40C will be described. By attaching the same reference numerals as those in the first embodiment, the redundant description is omitted.
[0038]
The sub-reflector unit 40C of the third embodiment has two effective axes having optical axes L2d and L2e orthogonal to the optical axis L1 of the main reflector 20, similar to the sub-reflector unit 40A of the first embodiment. Reflective surfaces 43d and 43e are provided.
[0039]
The effective reflection surface 43d is a parabolic column curved surface that is disposed on the inner side in the vehicle width direction of the optical axis L1 and extends parallel to the optical axis L1, and exits diagonally forward right from the discharge center C of the discharge bulb 30. As shown by L31 in FIG. 10, the light is diffused and reflected obliquely to the left by the effective reflecting surface 43d, and supplements the left front side of the light distribution (first light distribution pattern P1) formed by the main reflector 20. A light distribution (second light distribution pattern P24) is formed.
[0040]
On the other hand, the effective reflection surface 43e is disposed outside the optical axis L1 in the vehicle width direction and extends in parallel with the optical axis L1, and the discharge center C is the first focal point f1 and the position near the optical axis L1 is the second focal point f2. It is composed of an ellipsoidal curved surface that can guide all of the reflected light to the effective reflecting surface 43d. Then, the light emitted diagonally forward leftward from the discharge center C of the discharge bulb 30 is reflected by the effective reflection surface 43e and then diffusely reflected leftward by the effective reflection surface 43d, as indicated by reference numeral L32 in FIG. Thus, a light distribution (third light distribution pattern P25) that supplements the left side of the light distribution (first light distribution pattern P1) formed by the main reflector 20 is formed.
[0041]
In the above-described embodiment, the direct reflector 44 is provided in the sub-reflector unit, but it is not always necessary.
[0042]
In the above-described embodiments, the present invention has been described with respect to a headlamp using the discharge bulb 30 as a light source. However, the present invention can also be applied to a headlamp using a halogen bulb provided with a filament as a light emitting unit as a light source.
[0043]
In the above-described embodiment, the front cover 14 is formed in a three-dimensional streamline shape that greatly wraps around from the front to the side of the vehicle body, and the shape of the reflector is restricted so that the solid angle in the main reflector optical system is not sufficient. Although described, the shape of the reflector is not restricted, and the present invention can be similarly applied to a headlamp that can obtain a solid angle in the main reflector optical system.
[0044]
In the above-described embodiments, the present invention has been described with respect to a vehicle headlamp for forming a low beam. However, the present invention can be applied to a headlamp for forming a traveling beam, a fog lamp, and other vehicle headlamps.
[0045]
【The invention's effect】
As is apparent from the above description, according to the automotive headlamp according to the first aspect, the first light distribution pattern having a light amount substantially similar to the headlamp standard formed by the main reflector is formed by the sub-reflector. The second light distribution pattern that spreads widely from the front to the side supplements the light distribution of the entire headlamp, increasing the driver's viewing distance from the front of the vehicle to the side. The headlamp with good visibility can be obtained, and safe driving is ensured not only for elderly drivers but also for general drivers.
[0046]
According to the second aspect, when the lamp is not lit, the bright interior of the mirror color can be seen through the front cover, and a luxurious and high-class image is obtained.
[0047]
According to the third aspect, the amount of light distribution from the front of the vehicle to the side is reliably increased by the diffusely reflected light of the sub-reflector, and the visibility from the front of the vehicle to the side is reliably improved.
[0048]
According to the fourth aspect of the present invention, the front end portion of the vehicle body including the headlamp is formed in a continuous streamline shape to obtain a smart image, and the light distribution is reduced due to insufficient solid angle of the main reflector optical system. Since it is compensated by the reflected light distribution by the sub-reflector, an appropriate light distribution can be secured even if the reflector shape is restricted. In other words, it is possible to satisfy both an automobile design and an appropriate light distribution with good driver visibility.
[0049]
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an automotive headlamp according to a first embodiment of the present invention.
FIG. 2 is a horizontal sectional view of the headlamp.
FIG. 3A is a perspective view of a sub reflector.
(B) It is a longitudinal cross-sectional view of a sub reflector.
(C) Cross-sectional drawing of the sub-reflector.
4A is a horizontal cross-sectional view showing an optical path of light reflected by an effective reflection surface of a main reflector of a left headlamp and an effective reflection surface of a sub reflector. FIG.
(B) is a horizontal sectional view of the optical path of light reflected by the effective reflection surface of the main reflector and the effective reflection surface of the sub-reflector of the right headlamp.
FIG. 5A is a diagram showing a light distribution pattern of the left headlamp on the screen.
(B) is a figure which shows the light distribution pattern of the right headlamp on a screen.
(C) is a figure which shows the synthetic | combination light distribution pattern of the left and right headlamps on a screen.
FIG. 6 is a diagram showing a light distribution pattern of the headlamp on a running road surface.
FIG. 7 is a horizontal sectional view showing an optical path of light reflected by an effective reflection surface of a main reflector and an effective reflection surface of a sub-reflector in an automotive headlamp that is a second embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of an effective reflection surface of a sub reflector.
FIG. 9A is a diagram showing a light distribution pattern of the left headlamp on the screen.
(B) is a figure which shows the light distribution pattern of the right headlamp on a screen.
FIG. 10 is a horizontal sectional view showing an optical path of light reflected by an effective reflection surface of a main reflector and an effective reflection surface of a sub reflector in an automotive headlamp that is a third embodiment of the present invention.
FIG. 11 is a diagram showing a light distribution pattern of the headlamp on the screen.
[Explanation of symbols]
U1 Light source unit
S light room
12 Lamp body
13 Valve insertion hole
14 Front cover
20 Main reflector
22 Effective reflecting surface of the main reflector
22a Effective reflective surface inside the vehicle width direction of the light source
22b Effective reflection surface of the light source on the outer side in the vehicle width direction
30 Discharge bulb as a light source
32 arc tube
33 Sealed glass sphere as light emitting part
C Discharge center
40A, 40B, 40C Sub-reflector unit
42 Sub-reflector housing
43a, 43b, 43c, 43d, 43e Effective reflection surface of sub-reflector (unit)
44 Direct Shade
f1 The first focal point of the ellipsoidal curved surface
f2 Second focal point of ellipsoidal curved surface
Optical axis of L1 main reflector (lamp)
L11 Light reflected from the effective reflecting surface of the main reflector
L2a, L2b, L2c, L2d, L2e Optical axis of the effective reflecting surface of the sub-reflector
L21, L22, L23, L31, L32 Reflected light at the effective reflecting surface of the sub-reflector
P1 Main reflector light distribution pattern
P21, P22, P23, P24, P25 Light distribution pattern of sub-reflector

Claims (1)

A light source, a main reflector that is disposed behind the light source and reflects light emitted from the light source forward, a front cover disposed in front of the light source, and a light source that is disposed slightly forward of the light source. in the automotive headlamp example Bei a small subreflector for reflecting mainly on the side of the light emitted from,
The light source is a discharge bulb, and the sub-reflector has an optical axis substantially orthogonal to the optical axis of the main reflector, and is provided below the optical axis of the main reflector, and the front and rear sides of the optical axis. A cap-type sub-reflector housing having a pair of left and right effective reflecting surfaces; an L-shaped leg portion extending rearward from the sub-reflector housing and attached to a lower portion of the main reflector; and the sub-reflector An automotive headlamp comprising a direct shade formed on a substantially upper half of a front surface of a housing .

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