JPS62123603A - Reflecting mirror for automobile head lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The details of the vehicle and headlight reflector of the present invention will be explained in accordance with the following items.

A. Industrial field of application B0 Overview of the invention C0 Prior art [Figures 11 to 14] D6 Problems to be solved by the invention E0 Means for solving the problems 1 to 9] 59 Effects [Fig. 10] Effects of the G0 Invention (A, Industrial Application Field) The present invention relates to a novel reflector for automobile headlights. Specifically, by improving the configuration of the reflective part, we have improved the light distribution without a lens, especially the light distribution of passing beams,
The present invention aims to provide a novel reflector for automobile headlights that reduces the burden on the lens and facilitates lens design.

(B. Summary of the Invention) The automobile headlamp reflector of the present invention includes a first reflecting section that is spaced apart from each other on the left and right sides, and a second reflecting mirror that is located in an intermediate portion in the vertical direction of a region between the left and right first reflecting sections. comprising a reflecting part and a second reflecting part existing above the second reflecting part in the area between the left and right first reflecting parts, and each of these reflecting parts is constituted by a paraboloid of rotation having a substantially common focal point, The focal length of the second reflecting section is made larger than the focal length of the first reflecting section, and the optical axes of the left and right second reflecting sections are respectively inclined outward, and the focal length of the third reflecting section is set to be the focal length of the first reflecting section. By making the third reflecting section smaller and approximately dividing it into left and right halves, and tilting the optical axes of these left and right parts inward, a sub Of the light reflected by the filament reflector, we eliminate the light that goes far downward from the horizon, and generate light that goes to the area below the horizon that is separated to the left and right. The light distribution near the center of the area is made denser, thereby making it possible to obtain a light distribution closer to that of a passing beam without a lens.

(C, Prior Art) [Figures 11 to 14] For example, there is a reflector for automobile headlights shown in Japanese Patent Publication No. 14003/1983, which is shown in Figures 11 to 14. Shown below.

In FIGS. 11 to 14, (100) is a reflecting mirror main body, and (102) is a back opening formed in the center of the main body (100) for inserting a light source. (103)
, (104) are the first reflecting parts arranged at left and right intervals from the back opening (102), and (105) and (106) are the first reflecting parts (103), (104) and the back opening (102), respectively. ), (107) a second reflecting section disposed between
is above the back opening (102) and is located above the first reflecting portion (102).
02) and (103).

And each reflecting part (103), (104), (105)
, (10B), and (107) form a paraboloid of rotation that share the focal position, and the second reflecting portions (105) and (106)
) and the third reflecting section (107) are the first reflecting section (103),
(104) has a shorter focal length than that of (104).

The light distribution by the reflecting mirror (Zoo) as described above is the first
The result will be as shown in Figure 4. In this case, the light source is located along the main optical axis of the reflecting mirror (100) (each of the reflecting parts (103), (104)
), (105), (106), and (107). ) is placed slightly in front of the focal point, and uses a subfilament (also for low beam) whose front and lower half are covered.

In the light distribution in Fig. 14, the part (A) is the first reflecting part (103
), (104), part (B) is due to light reflected at the third reflecting part (107),
The portion (C) is due to the light reflected by the second reflecting portions (105) and (106). The part (A') has high illuminance, and the parts CB) and (C) have relatively uniform and low illuminance.

(D. Problem to be Solved by the Invention) Approximately the lower half portion (shaded) of the portion (B) during light distribution by the conventional automobile headlamp reflector (100) described above is a passing beam. This is an unnecessary part due to the light distribution. Therefore, the light in this part must be directed to a part that requires a predetermined illumination intensity in terms of the light distribution of the passing beam by the action of the lens. In particular, the above-mentioned reflector (1
00), which has a non-circular aperture (101), has a considerable amount of effective reflection at the top and bottom removed compared to one which has a circular front aperture, so a small amount of luminous flux is generated. However, it is necessary to utilize it without wasting it.

In order to direct the light directed toward the shaded portion of the light distribution CB) to another portion using a lens, it is necessary to provide a lens element for this purpose, which makes lens design difficult. In particular, in the case of a headlamp that emits both a main beam and a passing beam, it is necessary to take care so that the lens element does not affect the light distribution of the main beam, and the negative beam is controlled by the lens. The more parts that need to be added, the more difficult it becomes to design a lens.

Therefore, the present invention was made in view of the above-mentioned problems, and by improving the configuration of the reflecting section, the light distribution without a lens, especially the light distribution of the passing beam, is improved, and the light distribution of the passing beam is improved. It is an object of the present invention to provide a novel reflector for an automobile headlamp that can ease the lens design by reducing the burden of forming light distribution.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the automobile headlamp reflector of the present invention has a first reflecting section that is spaced apart from the center to the left and right, and The second reflecting part is located in the center of the area between the two first reflecting parts, and the third reflecting part is located in the upper part. The focal length is made larger than the focal length of the first reflecting section so that the focal position thereof is located in front of the focal position of the first reflecting section, and the optical axes of the left and right second reflecting sections are respectively inclined inward, and the third The focal length of the reflecting section is made shorter than the focal length of the first and second reflecting sections so that its focal position is located near the focal position of the first reflecting section, and the third reflecting section is divided into left and right parts. The optical axes of the left and right parts are tilted inward.

Therefore, according to the present invention, the light reflected by the second reflecting part comes closer to the center just below the horizon, and the light reflected by the third reflecting part comes to be located at both the left and right ends of the light distribution. As it is, the pattern becomes almost the basic shape of the passing beam, which reduces the burden on the lens and facilitates lens design.

(F. Example) Below, details of the reflector for an automobile headlamp of the present invention will be described according to the illustrated example.

(a, Structure) [Figures 1 to 9] Reference numeral 1 is a reflecting mirror, which has a concave surface that opens toward the front as a reflecting part, and is made of a material with good molding precision and strong strength, such as FRP. However, the forming material and forming method are not limited to these.

This reflecting mirror 1 is equipped with a front opening 2 having a substantially horizontally long rectangular shape, and 3 is an insertion hole formed approximately in the center of the reflecting mirror 1, and the light source part of the light source bulb is inserted through this insertion hole 3. It is arranged within the reflecting mirror 1.

4d and 4p are first reflecting portions, which are arranged near both left and right ends. And these first reflecting parts 4d, 4p
are formed in areas that occupy approximately one-fourth of the area of the opening surface of the reflecting mirror 1 in terms of the front shape, and extend from the upper end to the lower end of the reflecting mirror 1, and extend to each side edge of the reflecting mirror 1 on the left and right sides. has been done. The additional codes rdJ and rPJ are distinguished by adding "d" to those on the driving lane side and rPJ to those on the oncoming lane side with respect to the center of the reflector 1 as a reference.

5d and 5p are second reflecting portions occupying a substantially fan-shaped portion between the first reflecting portions 4d and 4p and the insertion hole 3.

6 is a third reflecting part, which includes the upper edge of the insertion hole 3, the second reflecting part 5d, the upper edge of 5p, the upper edge of the reflecting mirror 1, and the first reflecting part 4d;
It is arranged in the area surrounded by the inner edge of 4p. The third reflecting portion 6 is divided from the center into two left and right portions 6d and 6p.

Each of the reflecting portions 4d, 4p, 5d, 5p, 6d, and 6p is formed to form a paraboloid of revolution.

Further, the first reflecting portions 4d and 4p are oriented substantially straight in the front direction of the reflecting mirror 1, and therefore, the optical axes of these reflecting portions extend in the front-rear direction passing approximately through the center of the reflecting mirror 1. The main optical axis is X m -X m.

The focal lengths of the second reflecting sections 5d and 5p are made larger than the focal lengths of the first reflecting sections 4d and 4p, and the focal length Fe
d, F5p are located in front of and below the focal point F of the first reflecting portions 4d, 4p, and optical axes x5d-x5d, xsp
-x5p are tilted toward the white side, ie, the right side faces to the left, and the left side faces to the right.

Further, the optical axes xd-xd and xp-xp of the portions 6d and 6p of the third reflecting portion are arranged inward, that is, the right side faces to the left, and the left side faces to the right.
It is slanted. Further, these focal points F6d and Fep are located slightly apart to the left and right of the focal point F when viewed in plan,
It is located at approximately the same position as focal point F when viewed from the side.

Note that the focal point F and main optical axis X m of the first reflecting portions 4d and 4p
-X m and second reflecting section 5d, 5p (7) focal point F5d, F
5p and the optical axes x5d-x5d and xsp-xsp are conceptually shown in FIG. 6 when viewed from above, and in FIG. 7 when viewed from the side. In addition, the focal points F6d and FsP of the third reflecting portions 6d and 6p and the optical axes xd-xd
, xp-xp, the principal optical axis X m -X m and the focal point F
The relationship between the two is shown in FIG. 8 when viewed from above, and FIG. 7 when viewed from the side.

In FIG. 7, the two-dot chain line indicates the position when the second reflecting parts 5d, 5p are not tilted or moved, and in FIG. 8, the two-dot chain line indicates the position when the third reflecting part 6d, 6p is not tilted. It shows the position of

Furthermore, in this embodiment, the focal length of the first reflecting sections 4d, 4p is about 45 mm, the focal length of the second reflecting sections 5d, 5p is about 50 mm, and the focal length of the third reflecting sections 6d, 6p is about 45 mm. It is formed to be 20 mm.

Reference numeral 7 shows an example of a light bulb used in combination with the reflecting mirror 1, which is generally referred to as an H4 bulb. When this light bulb 7 is inserted through the insertion hole of the reflecting mirror 1 and its light source is placed inside the reflecting mirror 1, the filament arrangement is as follows.

Reference numeral 8 denotes a main filament for irradiating the traveling beam, and it is arranged at approximately the focal point F of the reflecting mirror 1 so as to extend approximately along the main optical axis X m -X m.

9 is a subfilament for passing beam irradiation;
A main optical axis X m −X m is located in front of the main filament 8.
It is arranged so as to extend approximately along the .

A shade 10 covers a part of the sub-filament 9, and is formed to cover about the lower half and the front of the sub-filament 9. Further, of both shoulders of the shade 10, the shoulder on the oncoming lane side is located slightly below the horizontal line passing through the main optical axis Xm-Xm.

(b. Effect) [Fig. 10] The light distribution due to the light reflected by the reflecting mirror 1 of the sub-filament 9 arranged as described above is as shown in Fig. 10.

In the light distribution diagram in Figure 10, H-H is the main optical axis X of the reflecting mirror 1.
A horizontal line that intersects with the extension line of m - X m, and V-■ is a vertical line that also intersects with the extension line of the main optical axis X m -X m.

During this light distribution, a portion lid is a portion that is irradiated with the light reflected by the first reflecting portion 4d, a portion tip is a portion that is irradiated with the light reflected by the first reflecting portion 4p, and a portion 12d is a portion that is irradiated with the light reflected by the first reflecting portion 4p. The part 12p is the part to which the light reflected by the second reflection part 5d is irradiated, and the part 12p is the part to which the light reflected by the second reflection part 5p is irradiated.
3d is a portion to which the light reflected by the third reflecting portion 6d is irradiated, and portion 13p is a portion to be irradiated by the light reflected by the third reflecting portion 6p.

As can be seen from this light distribution diagram, the light distribution to the unnecessary part, which is largely shifted downward, is eliminated, and the part 13d,
The light is distributed to the side as shown in 13p, and the light distribution 12d and 12p by the second reflecting portions 5d and 5p are located near the center of the area just below the horizontal line H-H, and the beams passing each other with only the reflected light are located. A light distribution pattern close to the light distribution pattern can be obtained. Therefore, the design of the lens for obtaining the light distribution of the passing beam becomes significantly easier.

(G. Effects of the Invention) As is clear from the above description, the reflector for an automobile headlamp of the present invention has a concave surface opening toward the front as a reflecting portion. A first reflective part that is located apart from the center to the left and right, a second reflective part that is located in the middle part in the vertical direction of the area between the left and right first anti-sealing parts, and a third reflecting section existing above the second reflecting section in a region between the first reflecting sections, the first to third reflecting sections are formed as a paraboloid of rotation, and the second reflecting section The focal length of the first reflecting section is made larger than the focal length of the first reflecting section so that its focal position is located in front of the focal position of the first reflecting section, and the optical axes of the left and right second reflecting sections are respectively inclined inward. The focal length of the three reflecting parts is set to the first and second
The focal length of the third reflecting section is set to be shorter than the focal length of the first reflecting section, and its focal position is located near the focal position of the first reflecting section, and the third reflecting section is divided into left and right sections approximately in the center thereof, and the optical axis of each section is set. It is characterized by slanting inward.

Therefore, according to the present invention, the light reflected by the second reflecting part is located near the center just below the horizon, and the light reflected by the third reflecting part is located at both the left and right ends of the light distribution. Therefore, the pattern is almost the same as the basic shape of the passing beam, which reduces the burden on the lens and facilitates lens design.

[Brief explanation of drawings]

1 to 10 show an example of the implementation of the automobile headlamp reflector of the present invention, with FIG. 1 being a front view and FIG. 2 being a sectional view taken along line II-II in FIG. 1. , Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 is a sectional view taken along the line IV-IV in Fig. 1.
A sectional view along the line, Figure 5 is a perspective view seen from the back side, Figure 6 is a perspective view taken from the back side.
The figure is a horizontal sectional view conceptually showing the optical axis and focal point of the first and second reflecting parts, FIG. 7 is a vertical sectional view conceptually showing the optical axis and focal point of each reflecting part, and FIG. A horizontal cross-sectional view conceptually showing the optical axis and focal point of the reflecting part, Fig. 9 is a perspective view showing an example of a light bulb, Fig. 10 is a light distribution diagram, and Figs. 11 and 12 are conventional automobile headlights. 11 is a front view, FIG. 12 is a horizontal cross-sectional view, FIG. 13 is a perspective view seen from the back side, and FIG. 14 is a light distribution diagram. Explanation of symbols 1...Reflector for automobile headlights, 4d, 4p, fist first reflecting part, 5d, 5p...second reflecting part, 6d, 6p...third anti-needle part, F. ...Focus position of the first reflection section, F1a, Fsp...Focus position of the second reflection section, F1a
, Fep...focal position of the third reflection section, x5d-x5
d... Optical axis of the second reflecting section, xsp xsp... Optical axis of the second reflecting section, xd - xd φ... Optical axis of the third reflecting section, xp - xp... Optical axis of the third reflecting section Optical axis applicant: Koito Seisakusho Co., Ltd. Representative Patent Attorney Yu Komatsu Beat: 龜ミ一SunLl')■ Qi N

Claims (1)

[Claims] (1) A reflector for an automobile headlamp whose reflecting portion is a concave surface that opens toward the front, and includes a first reflecting portion that is spaced apart from the center to the left and right, and the left and right first reflecting portions. a second reflecting section existing in the middle part in the vertical direction of a region between them, and a third reflecting section also existing above the second reflecting section in the region between the left and right first reflecting sections, The first to third reflecting parts are formed as paraboloids of revolution, and the focal length of the second reflecting part is made larger than the focal length of the first reflecting part, so that the focal position thereof is the same as the focal position of the first reflecting part. At the same time, the optical axes of the left and right second reflecting sections are tilted inward, and the focal length of the third reflecting section is made shorter than the focal length of the first and second reflecting sections, so that the focal position is changed to the third reflecting section. An automobile headlamp characterized in that the third reflecting part is located near the focal point of the first reflecting part, the third reflecting part is divided into right and left parts approximately at the center thereof, and the optical axes of the left and right parts are tilted inward. reflector for