JPH01159902A - Automobile head light - Google Patents

Abstract

PURPOSE: To reduce the role of a cover lens at the time of obtaining a required luminous intensity distribution, by enabling to obtain a luminous intensity distribution which is similar to the luminous intensity distribution required as a luminous intensity distribution of a dipped beam or a main beam in the state where a cover lens is not used. CONSTITUTION: A luminous intensity distribution pattern whose upper edge is restricted by a shielding edge 14 of a shielding body 12, namely, a luminous intensity distribution pattern which is similar to the luminous intensity distribution pattern required for a dipped beam, is formed by an upper reflector 3, a sub-filament 7, the shielding body 12 and a condensing lens 15. And, a luminous intensity distribution pattern, which has a diffusion part, expanded to right and left by the upper reflector 3, a main filament 8 and the condensing lens 15, and also has a high luminous intensity part in the center, formed by a lower reflector 4, the main filament 8, a reflector 16 and an emissive mirror 181, namely, a luminous intensity distribution pattern which is similar to the luminous intensity distribution pattern required for a main beam, is formed. Therefore, a region facing to the condensing lens 15 becomes a simply passing-by part where a lens function hardy affects, and a control function of such a cover lens 19 that lens elements are formed in the region facing to the emissive mirror 181, is needed very little.

Description

[Detailed description of the invention] The automobile headlamp of the present invention will be explained according to the following items.

A. Field of industrial application B. Outline of the invention C. Prior art 1. Problems to be solved by the invention E. Means for solving the problems F. Example 89 Reflector b. Light source C. Light-shielding cap d. Light-shielding body e. Condensing lens f1 reflection mirror, exit mirror g, cover lens h light distribution pattern G Effects of the invention (A. Field of industrial application) The present invention relates to a novel automobile headlamp. Specifically, the present invention aims to provide a novel automobile headlamp that emits a driving beam and a passing beam, and which reduces the role played by a cover lens in obtaining a desired light distribution pattern. It is something.

(B. Summary of the Invention) The automobile headlamp of the present invention consists of an upper reflector that condenses light from a light source located at the focal point onto a focusing area in front, and an abbreviation for the light from the light source located at the focal point. The sub-filament is placed at the focal point of the upper reflecting mirror, the main filament is placed at the focal point of the lower reflecting mirror located behind the focal point of the upper reflecting mirror, and the upper reflecting mirror A part of the sub-filament light reflected by the light is intercepted by a light-shielding body located near the light-shielding area, and the light is projected forward by a condensing lens placed in front of the light-shielding body to form a passing beam. The light from the main filament reflected by the lower reflector is sequentially reflected by the reflector and the output mirror and emitted forward, and the light from the main filament is irradiated forward by the upper reflector and condensing lens to form a traveling beam. By doing so, it is possible to realize a light distribution pattern close to the light distribution pattern required for each of the traveling beam and the passing beam, with or without control using a cover lens, and thus obtain the required light distribution pattern. The role played by the cover lens can be reduced.

(C Prior Art) Automobile headlights are required to have a predetermined light distribution pattern in order to ensure driving safety.

In conventional automobile headlights, in order to obtain the desired light distribution pattern, a parallel light beam is created by a reflecting mirror having a paraboloid of revolution, and a certain portion of the parallel light beam is A cover lens is used to control the light by concentrating it in the center, diffusing it in the left and right directions in another part, moving it upward and to the left in another part, and so on, in order to obtain the desired light distribution pattern. The role played by the cover lens was extremely important.

(D. Invention or problem to be solved) By the way, the appearance of a car is determined from the perspective of fluid dynamics and design, so the headlights for cars must be in harmony with this. In this case, the size and shape of the cover lens are often extremely limited.

In such a case, there is a problem in that if a cover lens plays a large part of the role of forming a light distribution pattern, a satisfactory light distribution pattern cannot be obtained.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the automobile headlight of the present invention reflects the light from the light source located at the focal point and focuses it on a light condensing area in front. An upper reflector that reflects the light from the light source located at the focal point and a lower reflector that converts the light into a parallel beam are combined so that the focus of the upper reflector is in front of the focus of the lower reflector,
A sub-filament is placed at the focal point of the upper reflector, and a main filament is placed at the focus of the lower reflector, and a light-shielding cap is provided to block the sub-filament from the front and the lower reflector, and the upper edge serves as a light-shielding edge. A light-shielding body is placed close to the optical axis of the upper reflector near its light-shielding edge or the light-concentrating area, and a light-shielding body located in front of the light-shielding body and whose focal point is on the light-shielding edge of the light-shielding body is placed in close proximity to the optical axis of the upper reflector. A light lens is provided, and a reflection mirror and an output mirror are further provided for outputting the light of the main filament reflected by the lower reflection mirror to the front from the side of the light shielding body.

Therefore, in the automobile headlamp of the present invention, the upper reflector, the subfilament, the light shield, and the condenser lens require a light distribution pattern whose upper edge is limited by the light shielding edge of the light shield, that is, a staggered beam. A light distribution pattern similar to the light distribution pattern is formed, and it also has a diffusion part that spreads from side to side by the upper reflector, the main filament, and the condensing lens, and also includes the lower reflector, the main filament, the reflector, and the output mirror. Accordingly, a light distribution pattern having a high luminous intensity portion at the center, that is, a light distribution pattern close to the light distribution pattern required for a traveling beam is formed. Therefore, the cover lens only needs a few control functions.

(F Example) Below, a description will be given according to Example 1, which illustrates an automobile headlamp of the present invention.

(a Reflector) 2 is a reflector, which is formed by integrally forming an upper reflector 3 and a lower reflector 4.

The upper reflecting mirror 3 has a reflecting surface 5 having a shape in which the lower half of the reflecting surface is removed, which reflects the light from the light source located at the focal point and focuses the light on a condensing area in front. Examples of such reflective surfaces include, for example, a spheroidal surface with a dot-shaped light-concentrating area, and an ellipse-parabolic compound surface with a linear light-converging area extending in the horizontal direction. , that is, a surface that is elliptical in vertical cross section and parabolic in horizontal cross section, and other surfaces may be considered. Note that the explanation here assumes that an ellipsoid of revolution is adopted.

The lower reflecting mirror 4 has a reflecting surface 6 having a shape in which the upper half of the reflecting surface is removed so that the light from the light source located at the focal point is reflected into a parallel beam of light. An example of such a reflecting surface is a paraboloid of revolution.

In this reflecting mirror 2, the optical axes xx of the upper reflecting mirror 3 and the lower reflecting mirror 4 coincide with each other, and the focal point f1 of the upper reflecting mirror 3 is slightly smaller than the focal point fp of the lower reflecting mirror 4. They are combined so that they are located at the front.

(b, light source) 7 is a sub-filament for the staggered beam, and is arranged along the optical axis x-x at the focal point f1 position of the upper reflecting mirror 3.

Reference numeral 8 denotes a main filament for the traveling beam, which is disposed at the focal point fp of the lower reflecting mirror 4 along the optical axis xx.

Therefore, the light beams 9,9, . Although the light is focused, the sub-filament 7 is not a point light source but has a certain size, so the light is focused into a spot of a certain size.

Also, the light is emitted from the main filament 8, and the lower reflector 4
The reflected light 10.10, . . . becomes light parallel to the optical axis XX. Furthermore, out of the light emitted from the main filament 8, the light 11.11 reflected by the upper reflecting mirror 3...
The light is condensed into a dog-eye spot in front of the second focal point f2 of the upper reflecting mirror 3.

(c, light-shielding cap) 12 is a light-shielding cap that is approximately boat-shaped, and covers the front and lower half of the sub-filament 7, and protects the light directly radiated forward from the sub-filament 7 and the reflection surface of the lower reflector 4. It is designed to block the light directed towards 6.

(d Light-shielding body) 13 is a light-shielding body, and its upper edge 14 is used as a light-shielding edge. The light-shielding edge 14 is located on the left side from the center (
The portion on the right side from the center is a horizontal edge 14b.

The light shielding body 13 is located slightly in front of the second focal point f2 of the upper reflecting mirror 3, approaches the light shielding edge 14 from below to the optical axis x-x, and extends approximately perpendicular to the light shielding edge 14 to the optical axis x-x. It is placed facing the same direction.

(e, Condensing Lens) 15 is a condensing lens arranged in front of the light shielding body 13, and its front axis substantially coincides with the optical axis XX of the reflecting mirror 2, and its focal point f. It is located approximately at the center of the light-shielding edge 14 of the light-shielding body 13.

(f Reflection mirror, output mirror) 16 is a reflection mirror, which is arranged in front of the light shielding body 13, that is, on the reflection mirror 2 side. Also, its upper end is the light shielding body 1
It is located at a slightly lower position than the light shielding edge 14 of No. 3.

The reflecting mirror 16 has a substantially △-shaped planar shape, and has a right reflecting surface 17r facing diagonally rearward to the right at an angle of approximately 45 degrees with respect to the optical axis x-x toward the reflecting mirror 2. It has a left reflecting surface 17 facing diagonally rear left at an angle of approximately 45 degrees with respect to the optical axis x--x. And the right reflective surface 1
A connecting portion between 7r and the left reflecting surface 17ρ is located on the optical axis x-x when viewed in plan.

18r, 18°C is the exit mirror, right exit mirror 1
8r is located to the right of the right reflecting surface 17r of the reflecting mirror 16, and faces diagonally forward to the left when looking toward the opposite-of mirror 2. Further, the left exit mirror 18fl is located to the left of the left reflecting surface 17ft of the reflecting mirror 16, and faces diagonally forward to the right when looking toward the reflecting mirror 2.

Therefore, the right half of the light 10.10, .
The left half of the light 10, 10, . will be done.

(g cover lens) 19 is a horizontally long cover lens, and the condensing lens 15
and is arranged so as to cover the front of the output mirrors 18r and 18J2.

A region 20c of the cover lens 19 facing the condensing lens 15 is a transparent portion with almost no lens action, a region 20r facing the exit mirrors 18r and 181, and lens elements 21, 21, . . . at 20° C. A control section is formed by forming a control section.

The lens elements 21, 21, . . . may be suitably formed of four different types, such as left and right diffusing elements, upward or downward refractive elements, etc.

(h, Light Distribution Pattern) In the above automobile headlamp 1, the light distribution pattern shown in FIG. 4 can be obtained with the cover lens 19 removed. In addition, FIG. 4 shows a light distribution pattern projected on a screen placed at a distance in front of the automobile headlamp 1, where H-H intersects at right angles to the optical axis x-x and extends in the horizontal direction. V-V is a line that intersects the optical axis x-x at right angles and extends in the vertical direction.

The light distribution pattern 22 shown in FIG. 14 is the bright/dark boundary line.

The light distribution pattern 24 shown in FIG. 4(B) is when the main filament 8 is turned on, of which 25 is the light distribution portion due to the light 11, 11, . . . reflected by the upper reflector 3. be. Since these lights 11, 11, . Since the light crosses the axis, the degree of light condensation by the light condensing lens 15 is small, and the light is therefore in a slightly diffused state. 26 is the light 10 reflected by the lower reflecting mirror 4.
10,... is the light distribution part. This light 10.10
, . . . are substantially parallel light beams, and therefore form a light distribution portion 26 that is concentrated in a relatively small range. In addition, the light distribution part 2
In order to do this, the reflective surface of the reflective mirror 16 +7r,
This can be achieved by turning the output mirrors 18r and 18fl slightly upward at 17° C., or by turning the optical axis of the lower reflecting mirror 4 slightly upward.

As described above, in the automobile headlamp 1, without the cover lens 19, the light distribution patterns 22 and 24, which are required as light distribution patterns for passing beams and running beams, are provided. Since a light distribution pattern close to that of the cover lens 19 can be obtained, the cover lens 19
The role required for the cover lens 19 is small, therefore, the cover lens 19
Even if there are restrictions on the shape and size of the light, there is no problem in forming the required light distribution pattern.

(G. Effects of the Invention) As is clear from the above description, the automobile headlamp of the present invention has a substantially lower half of the reflecting surface that condenses the light emitted from the focal position onto the condensing area in front. an upper reflector having a reflective surface with a removed shape; a lower reflector with a reflective surface with approximately the upper half of the reflective surface removed to reflect light emitted from the focal position into a substantially parallel beam; and an upper reflector. A sub-filament placed at the focal point of the reflecting mirror, a main filament placed at the focal point of the lower reflecting mirror behind the focal point of the upper reflecting mirror, and a light-shielding cap covering the front and lower half of the sub-filament. and a light shielding body having a light shielding edge close to the optical axis of the upper reflecting mirror from below near the light condensing area;
A condensing lens is located in front of the light shield and its focal point is on the light shielding edge, and a condenser lens is located on the reflective surface side of the light shield and its upper edge is lower than the light shielding edge of the light shield and directs the light reflected by the lower reflector to the side. a reflecting mirror that reflects the light toward the front; an output mirror that is located on the side of the reflective mirror and reflects the light reflected by the reflective mirror toward the front; and an output mirror that is arranged to cover the front of the condenser lens and the output mirror. The area facing the condenser lens is a transparent part having almost no lens function, and the area facing the exit mirror is provided with a cover lens which is a control part in which a lens element is formed.

Therefore, according to the automobile headlamp of the present invention, the upper reflector, the subfilament, the light shield, and the condenser lens require a light distribution pattern whose upper edge is limited by the light shielding edge of the light shield, that is, a staggered beam. A light distribution pattern similar to the light distribution pattern is formed, and it also has a diffusion part that spreads from side to side by the upper reflecting mirror, the main filament, and the condensing lens, and the lower reflecting mirror, the main filament, the reflecting mirror, and the output mirror. Accordingly, a light distribution pattern having a high luminous intensity portion at the center, that is, a light distribution pattern close to the light distribution pattern required for a traveling beam is formed. Therefore, the cover lens only needs a few control functions.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the automotive headlamp of the present invention, in which Fig. 1 is a schematic perspective view, Fig. 2 is a schematic plan view, Fig. 3 is a schematic vertical sectional view, and Fig. 4 is a light distribution pattern. It is a diagram. Explanation of symbols 1...Car headlight, 3...Upper reflector, 4...Lower reflector, 5...
・Reflecting surface of the upper reflecting mirror, 6... Reflecting surface of the lower reflecting mirror, 7... Sub filament, 8... Main filament, 12... Light shielding cap, 13... Light shielding body, 14...・Shading edge, 15...
Condensing lens, 16... Reflection mirror, 18r, 181... Outgoing mirror, 19... Cover lens, 20c... Transparent part, 2Or, 20°C... Control part, 21... Lens Device applicant Koito Manufacturing Co., Ltd.

Claims (1)

[Scope of Claims] An upper reflecting mirror having a reflecting surface having a shape in which approximately the lower half of the reflecting surface is removed, which focuses the light emitted from the focal position onto a focusing area in front; A lower reflector having a reflecting surface with approximately the upper half of the reflecting surface removed to produce a substantially parallel beam of light, a sub-filament placed at the focal point of the upper reflecting mirror, and a sub-filament located behind the focal point of the upper reflecting mirror. A main filament placed at the focal point of the lower reflector, a light-shielding cap covering the front and lower half of the sub-filament, and a light-shielding cap close to the optical axis of the upper reflector from below near the above-mentioned light collection area. a condenser lens located in front of the light shield and whose focal point is located on the light shield edge; and a condenser lens located on the reflective surface side of the light shield with an upper edge lower than the light shield edge of the light shield and a lower part. a reflecting mirror that reflects the light reflected by the reflecting mirror to the side; an output mirror located on the side of the reflecting mirror that reflects the light reflected by the reflecting mirror forward; and the condenser lens and the output mirror. The cover lens is arranged so as to cover the front of the lens, and the area facing the condensing lens is a transparent part with almost no lens action, and the area facing the exit mirror is a control part in which a lens element is formed. Automobile headlights characterized by