JP2000182411A - Headlamp for aoutomobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance productivity and efficiency by integrally forming the front part than a parallel wall of a first reflecting surface and the front half part of a third reflecting surface as an adaptor part, integrally forming the remaining part of the first reflecting surface, a second reflecting surface, and the remaining part of the third reflecting surface, and jointing the adaptor part with a main body part. SOLUTION: A first reflecting surface 31 is formed by connecting, so that two surfaces (a first surface front half part 31A and the first surface remaining part 31B) having different focal distances form a parallel wall 35 parallel in the irradiating direction, and a light guide path 34 is formed on the parallel wall 35. A third reflecting surface 33 is formed in the top plate part of the first reflecting surface 31, and the first surface front half part 31A than the parallel wall of the first reflecting surface 31 and a third reflecting surface front half part 33A are integrally formed as an adaptor part 3A. The first reflecting surface remaining part 31B, a second reflecting surface 32, and a third surface remaining part 33B are integrally formed as a main body part 3B, and the adaptor part 3A and the main body part 3B are jointed. Thereby, beam utilization efficiency is enhanced, without increasing the number of part items.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight of an automobile, and more particularly, to an improvement in performance by enabling an improvement in the utilization of a luminous flux with respect to a light source, and a novel appearance in appearance. The purpose is to provide a headlight that enables design.

[0002]

2. Description of the Related Art FIG. 6 shows an example of the structure of a conventional lamp 90 of this type. As a basic structure, this lamp 90 has a rotating parabolic reflector 9 having a light source 91 arranged at a focal point.
2 and a lens 93 having a lens cut 93a. The parallel parabolic reflecting mirror 92 obtains reflected light of substantially parallel rays, and the reflected light is used as the lens cut 9 of the lens 93.
In step 3a, a desired light distribution characteristic is obtained by appropriately diffusing the light.

[0003]

However, in the lamp 90 having the above-described structure, the depth of the reflecting mirror 92 is increased to improve the efficiency with respect to the light source 91, which hinders the mounting of the reflecting mirror 92 on a vehicle. So that
No further improvement in efficiency can be expected, and therefore, when further improvement in illuminance is required, it is necessary to cope with the increase in power consumption of the light source.

In particular, in recent years, there has been a tendency to favor a lamp 90 having a reduced height in the vertical direction when mounted on a vehicle, and the reflecting mirror 92 does not contribute to the generation of reflected light. Since the area of the upper and lower top plate portions 92a increases and the effective area as the reflecting mirror 92 decreases and the efficiency with respect to the light source 91 tends to further decrease, some means for improving the efficiency of the reflecting mirror 92 is required. Has become.

Here, the applicant of the present invention has already provided a means for improving the efficiency of the reflecting mirror as Japanese Patent Application No. 10-197340, but FIG. However, the number of parts for forming a reflecting mirror is increased from one point in the conventional example to four points, which causes problems such as complicated production processes.

[0006]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a light source is arranged at a substantially focal point in a parabolic system, and the light source is arranged in the left-right direction of the light source. A first reflection surface provided with a light guide path penetrating to the rear side at an appropriate position, and a parabolic system that is disposed on the left and right outer sides of the first reflection surface and has a focus near the light guide path portion and A second reflection surface, and a third reflection surface mainly provided outside the optical path from the light source to the first reflection surface and having the light source as a first focal point and the light guide path as a second focal point. An automotive headlamp, wherein the first reflection surface is connected so that at least two surfaces having different focal lengths form a parallel wall substantially parallel to an irradiation direction, and the light guide path is formed on the parallel wall. And the third reflection surface is formed on a top plate of the first reflection surface. Together, the front part and the first half of the third reflection surface are integrally formed as an adapter part from the parallel wall of the first reflection surface, and the remaining part of the first reflection surface and the second reflection surface. A headlight for an automobile, wherein the remaining part of the third reflecting surface is integrally formed as a main body, and the adapter and the main body are joined to each other. Thus, the number of parts can be reduced to solve the problem.

[0007]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a vehicle headlamp according to the present invention. The vehicle headlamp 1 is roughly divided into a light source 2, a reflector 3, and a lens 4. According to the present invention, the reflection mirror 3 is used.
As described in Japanese Patent Application No. 10-197340, the first reflection surface 31, the second reflection surface 32 disposed outside the first reflection surface 31, and the third reflection surface Face 3
The first reflection surface 31 is provided with a light guide path 34 penetrating to the back surface.

Here, the outline of the basic structure of the automotive headlamp 1 of the present invention will be described. The first reflecting surface 31 is formed as a paraboloid such as a rotating paraboloid, and the focal point is adjusted. It is arranged substantially at the position of the light source 2, reflects light from the light source 2 as substantially parallel light rays, directs the light toward the lens 4, and forms a light distribution characteristic by a lens cut 4 a provided on the lens 4.

In FIG. 1, the third reflecting surface 33 which is only partially shown is, for example, the first reflecting surface 3.
A first reflection surface 31 of light emitted from the light source 2 such as one or both of the top and bottom or both top plates 31a (see FIGS. 2 to 5)
1 is provided at a position that does not reach
As shown by a broken line therein, the light source 2 is formed as an elliptical reflecting surface such as a spheroid having the first focal point and the vicinity of the light guide path 34 as a second focal point.

Accordingly, the third reflecting surface 33 forms an image of the light source 2 at the first focal point in the vicinity of the light guide path 34 at which the second focal point is located. 3
2 is formed as a parabolic reflecting surface whose focal point is in the vicinity of the light guide path 34, so that the light source image formed by the third reflecting surface 33 is reflected as parallel rays,
Will be directed to.

Therefore, the present invention and Japanese Patent Application No. 10-197 are disclosed.
According to the configuration of No. 340, light reaching the top plate portion 31a, which has not been used in the past, is collected by the third reflection surface 33 and directed to the irradiation direction by the second reflection surface 32.
This enables a brighter headlight to be realized even with light sources of the same standard.

In particular, in a recent headlamp in which the height in the vertical direction is set to be narrow, the ratio of the amount of light from the light source 2 which has reached the top plate 31a and has been disabled has increased. The effect of recovering the light from the light source 2 reaching the top plate portion 31a is remarkable. If this characteristic is positively utilized, the headlight of a small height, which is impossible in the configuration of the related art, is not possible. This can be realized without reducing the amount of light.

Here, in the present invention, the reflecting mirror 3 is formed into two parts, an adapter part 3A shown in FIGS. 2 and 3, and a main body part 3B shown in FIGS. 4 and 5. The adapter part 3A has a first reflecting surface 31.
Of the first surface 31A, which is a part of the third reflecting surface 33, a third surface front half 33A, which is a part of the third reflecting surface 33, a parallel wall 35 described later, and a guide formed on the parallel wall 35. Light path 34
It consists of:

Therefore, the main body 3B is provided with the first reflecting surface 3
1 and a third surface remaining portion 33B and a second reflecting surface 32, which are the remaining portions of the third reflecting surface 33, both of which are the adapter portion 3A. The reflecting mirror 3 is obtained by connecting two points of the main body 3B and the main body 3B at a predetermined position.

Next, the configuration of each section will be described in detail. In the actual implementation, various modifications are expected depending on the design of the vehicle and the like. However, in order to avoid complicating the description, in this embodiment, this lamp is used as a vehicle headlight. This will be described with an example on the right side of a central axis (optical axis) Z passing through the light source 2 when viewed from the driver's seat side.

First, as described above, the first reflecting surface 31 is formed as a parabolic reflecting surface such as a paraboloid of revolution. It is formed as two surfaces having different focal lengths with the light source 2 as the focal point, and the side having the shorter focal length is arranged as the first surface remaining portion 31B in the main body 3B.

The longer focal length side is disposed on the adapter portion 3A as the first surface front half portion 31A. However, in the case where the same position is the focal point on the parabolic reflecting surface, the further toward the front, the greater the distance. In addition, there is a difference in the amount of spread between the two reflecting surfaces, and when connecting the two reflecting surfaces at the same distance from the central axis Z, a step in the front-rear direction occurs.

In the present invention, the steps are connected by a parallel wall 35 parallel to the central axis Z, and the light guide path 34 is formed on the parallel wall 35. Then, the first reflecting surface 31 is divided into the adapter portion 3A so as to include the parallel wall 35 and the light guide path 34 together with the first surface front half portion 31A.

The division of the third reflecting surface 33 into the adapter portion 3A and the main body portion 3B is performed because the third reflecting surface 33 exists as an inner surface of a closed space such as a spheroid. , Basically the adapter part 3
A, and division is performed at a position having a maximum diameter with respect to the moving direction of the mold when forming the main body portion 3B. What is necessary is just to arrange | position with the three surface remaining part 33B.

Here, in this embodiment, a part of the front half portion 33A of the third surface provided on the side of the adapter portion 3A is replaced with a light source 2 as shown by a reference numeral 33Aa in FIGS. 1, 2 and 3. Is extended so as to cover the front of the lens, and also serves as a hood for shielding light reaching the lens 4 directly from the light source 2. Therefore, the light of this portion is also collected and effectively used as irradiation light from the second reflection surface 32.

Next, the operation and effect of the headlamp 1 for an automobile according to the present invention having the above-described structure will be described. First,
First reflection surface 31, second reflection surface 32, third reflection surface 3
The complicated configuration consisting of the reflecting mirror 3 composed of three surfaces and the light guide path 34, the parallel wall 35, etc., requires only two parts,
That is, it can be formed with the same number of components as the conventional configuration including the reflecting mirror and the hood, and a lamp with an excellent light flux utilization rate can be easily manufactured.

Further, the parallel wall 35 is provided on the first reflecting surface 31 and the light guide path 34 is provided on the parallel wall 35, so that all the light from the third reflecting surface 33 is
4 does not pass through, and even if a situation occurs in which a part of the parallel wall 35 comes into contact with the parallel wall 35, the reflected light is generated in a direction substantially perpendicular to the central axis Z. Never be.

This gives a degree of freedom to the position of the light guide path 34 in the parallel wall 35, and does not cause the occurrence of glare light. Light guide 3 in the most efficient position
4 is provided, and as a result, the efficiency of the entire vehicle headlamp 1 can be further improved. Furthermore, since the light guide path 34 is provided on the parallel wall 35, the size of the first reflection surface 31 can be freely set without deteriorating the area of the first reflection surface 31. In this respect, improvement in efficiency can be expected. Becomes

Although the above embodiment is limited by the power consumption of the light source 2 and the like, and has been described with respect to an example of an automotive headlamp which is most suitable for exhibiting the effects of the present invention, the present invention is not limited to this. It is not intended to limit, and even for lamps for other purposes,
It is possible to use the configuration described above to improve efficiency.

[0025]

As described above, according to the present invention, the first reflecting surface is formed by connecting at least two surfaces having different focal lengths so as to form a parallel wall parallel to the irradiation direction. Is formed on the parallel wall, the third reflection surface is formed on the top plate portion of the first reflection surface, and the front portion and the first half of the third reflection surface from the parallel wall of the first reflection surface. Are formed integrally as an adapter portion, the remaining portion of the first reflecting surface, the second reflecting surface, and the remaining portion of the third reflecting surface are integrally formed as a main body portion, and the adapter portion and the main body portion are joined. First of all, by adopting an automotive headlamp that has a configuration that consists of, this type of automotive headlamp with improved efficiency can be formed with the same number of parts as the conventional one. Thus, an extremely excellent effect in improving the productivity can be obtained.

Second, by providing a parallel wall on the first reflecting surface according to the present invention and providing a light guide portion on the parallel wall, it is possible to prevent the generation of glare light, The position and area of the reflective surface can be freely adjusted without deteriorating the effective area of the reflective surface, and the efficiency of the third reflective surface can be maximized, which can further improve the efficiency of automotive headlamps. It also has excellent effects.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an automotive headlamp according to the present invention.

FIG. 2 is a perspective view showing an adapter part which is a main part of the same embodiment.

FIG. 3 is a front view of an adapter unit.

FIG. 4 is a perspective view showing a main body part which is a main part of the same embodiment.

FIG. 5 is a front view of a main body.

FIG. 6 is a sectional view showing a conventional example.

FIG. 7 is an explanatory diagram showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Headlight for automobiles 2 ... Light source 3 ... Mirror 3A ... Adapter part 3B ... Body part 31 ... First reflection surface 31A ... First surface front half part 31B ... First surface remaining part 32 second reflective surface 33 third reflective surface 33A third surface first half 33B third surface residual portion 34 light guide path 35 parallel wall 4 lens

Claims (2)

[Claims] A first reflecting surface having a parabolic system, a light source disposed at a substantially focal point position, and a light guide path penetrating the back side at an appropriate position in the left-right direction of the light source; A second reflecting surface which is disposed on the left and right outer sides of the first reflecting surface and is a parabolic system whose focal point is in the vicinity of the light guide path portion, and an optical path which mainly reaches the first reflecting surface from the light source. And a third reflection surface having the light source as a first focus and the light guide path as a second focus, wherein the first reflection surface has at least two surfaces having different focal lengths. The light guide path is formed on the parallel wall, and the third reflection surface is formed on a top plate of the first reflection surface. Along with
The front part and the first half of the third reflection surface are integrally formed as an adapter part from the parallel wall of the first reflection surface, and the remainder of the first reflection surface, the second reflection surface, and the second A headlight for an automobile, wherein the remaining part of the three reflecting surfaces is integrally formed as a main body, and the adapter and the main body are joined to each other. 2. The vehicle headlight according to claim 1, wherein a part of the third reflecting surface of the adapter part is extended to the front of the light source and serves also as a hood. light.