JPH03269904A - Light for automobile having multiple reflector - Google Patents

Abstract

PURPOSE:To dissolve step structure by providing a composite reflector between a simple parabolic reflector and a multiple parabolic reflector. CONSTITUTION:The four pieces of circular parts between a simple parabolic reflector 7 and a multiple parabolic reflector 9 is divided in the coaxial shape at the same pitch as the multiple parabolic reflector 9, and also the division constitutes a composite reflector 10 wherein convex circular reflectors 10a, 10a,... and concave circular reflectors 10b, 10b,... retreated from these reflectors are arranged alternately. The convex reflectors 10, 10a,... are constituted along the parabolic reflector existing on the track continuing from the simple parabolic reflector 7, and also the concave reflectors 10b, 10b,... constituted of the faces which have retreated in the optical axis L so that they may maintain fixed width from this parabolic reflector. Hereby, the oblong image when the light constituting an oblong highly bright part in lighting is lit can be improved, and the step structure can be dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automobile lamp having a multi-reflection mirror surface in which the reflection surface of a reflector is stepped back in a stepped manner.

[Conventional technology]

In lighting equipment, so-called multi-reflection mirrors in which the reflective surface of the reflector is set back in a step-like manner can reduce the depth of the lamp compared to a simple reflector with a parabolic reflective curved surface, so it is difficult to install. It has been used more frequently than ever before as a lighting fixture for automobiles where space is limited.

However, since this type of automotive lighting cannot obtain a large solid angle, it is not possible to obtain a luminous flux as high as that of a single paraboloid. A reflector with an object-reflecting mirror surface is provided with an inner reflector, which is a separate member, in the center of the reflector and has a single parabolic reflective mirror surface with the bulb position as the focal point. There is a problem in that a shadow area is formed due to lack of luminous flux, and a dark area is formed in front of the lamp.

For this reason, conventionally, as shown in FIG.
The part from the center of 0 to the middle is a single parabolic reflecting mirror surface 51, followed by a multiple parabolic reflecting mirror surface 52, and each surface of the single parabolic reflecting mirror surface 51 and multiple parabolic reflecting mirror surface 52 is A lamp with a lighting bulb 53 at the focal point F is used, making it possible to reduce the overall depth of the lamp, and also making it possible to distribute high-intensity light with a single parabolic reflecting mirror surface 51. Became.

[Problem to be solved by the invention]

However, according to the above conventional configuration, the single parabolic reflecting mirror surface 5
1 and the multiple parabolic reflecting mirror surface 52 are arranged concentrically, so the illuminance of the part corresponding to the single parabolic reflecting mirror surface 51 becomes extremely high, and the central part of the lamp inevitably shines in a circular manner. For example, even in a lamp with a rectangular front shape, the central part always shines in a circular shape, so as a countermeasure, it is possible to make the front shape of the central single parabolic reflecting mirror surface rectangular. In this case, there is a problem in that a large level difference occurs between the rectangular single parabolic reflecting mirror surface 51 and the surrounding multiple parabolic reflecting mirror surface 52, resulting in poor appearance.

The present invention was devised in view of the above problem, and even if a single parabolic reflecting mirror section having a rectangular shape is configured in the center, a step difference occurs between the multiple parabolic reflecting mirror sections at the periphery. An object of the present invention is to provide an automobile lamp having a multi-reflecting mirror surface, which improves the appearance and appearance of the luminous surface when the light is turned on and off.

[Means to solve the problem]

In order to achieve the above object, the automotive lamp having a multi-reflection mirror surface according to the present invention uses the inner surface of the rear wall of the lamp body with an open front as a reflector, and a lens is provided on the front surface, and the optical axis inside the lamp chamber is In the automotive lamp provided with a lighting bulb on top, the reflective surface of the reflector is located in the center and forms a reflective surface consisting of a single parabolic curved surface with the bulb position as a substantially focal point, A single parabolic reflecting mirror surface exhibiting a rectangular front shape, and a step bank which is divided into a plurality of concentric circles at an appropriate pitch and sequentially parallel to the optical axis toward the outer periphery on the outside of the circumscribed circle of the single parabolic reflecting mirror surface. a multiple parabolic reflecting mirror surface consisting of a plurality of parabolic reflecting mirror surfaces;
It is formed in four arc-shaped parts between the single parabolic reflecting mirror surface and the multiple parabolic reflecting mirror surface, and is partitioned concentrically with approximately the same pitch as the multiple parabolic reflecting mirror surface, and the partitioned portion is formed into a convex annular shape. The gist of the present invention is that a composite reflecting mirror section is constructed in which a reflecting mirror surface and a concave annular reflecting mirror surface set back from the convex annular reflecting mirror surface are arranged adjacent to each other alternately.

[Effect]

The above-mentioned automobile lamp has a composite reflector section between a single parabolic reflector surface and a multiple parabolic reflector surface, and the front shape of the single reflector surface is rectangular, so when the light is turned on, A horizontally long rectangular high brightness (illuminance) section is formed. Further, since a composite reflecting mirror section is constructed between the single parabolic reflecting mirror surface and the multiple parabolic reflecting mirror surfaces, there is no difference in level between the two structures, and the appearance is good.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an automotive lamp having a multi-reflection mirror surface according to the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a plan sectional view of the lamp, and FIG. 2 is a front view of a different flutter of the lamp.

The body 1 of the lamp has a horizontally rectangular open front, and the inner surface of the rear wall forms a reflective surface as a reflector 2, which will be described later.A lens 3 is installed on the front surface to form a lamp chamber 4, and A lighting bulb 6 is replaceably fixed to a bulb holder 5 fixed to the center of the reflector 2 so as to be located on the optical axis in the chamber 4. The reflective surface of the reflector 2 is located in the center and forms a single parabolic curved surface with the focal point F at the position of the pulse 16, and has a horizontally long rectangle ABCD (A, B, C, and D are A single parabolic reflecting mirror surface 7 having a frontal shape (representing the apex of the adjacent side) is constructed. Further, the single parabolic reflecting mirror surface 7 has a circumscribed circle 8 centered on the optical axis on the outer periphery, and is divided into concentric circles at an appropriate pitch P on the outside thereof, and a focal point F
The multiple parabolic reflecting mirror surface 9 is constructed by sequentially snapping the parabolic reflecting mirror surfaces 9a, 9b, . Furthermore, the four arcuate portions (the portions surrounded by the horizontally long rectangle ABCD and the circumscribed circle 8) between the single parabolic reflecting mirror surface 7 and the multiple parabolic reflecting mirror surface 9 are as follows:
It is partitioned concentrically with the same pitch P as the multiple parabolic reflecting mirror surface 9, and the partitioned portion is divided into convex annular reflecting mirror surfaces 10a, 1.
0a... and the concave annular reflecting mirror surfaces 10b, 10b, . The convex annular reflecting mirror surfaces 10a, 10a, . . . are parabolic reflecting surfaces (arrow E
), and the concave annular reflecting mirror surface 1
0b, 10b, . . . are formed by surfaces G receding in the direction along the optical axis so as to maintain a constant width from the parabolic reflecting surface.

In addition, 11 is on the back of lens 3! This is the diffusion step at t2.

An automobile lamp having a multi-reflecting mirror surface having the above configuration is
Irradiation light is obtained by the reflected light flux from the bulb 6 which is reflected in the direction of the lens 3 by each reflecting surface of the reflector 2, and the direct light flux from the bulb 6.

Of these, the reflected light beam is formed by the light beam from the single parabolic reflection mirror surface 7, the light beam from the multiple parabolic reflection mirror surface 9, and the light beam from the composite reflection mirror section 10. In the composite reflecting mirror portion 10, a shadow portion (see hatched portion in FIG. 4) is formed due to the step-back step, so that the single parabolic reflecting mirror surface 7 in the center shines brighter than the surrounding area. Moreover, since the front shape of the single parabolic reflecting mirror surface 7 is a horizontally long rectangle, it harmonizes with the front shape of the lamp (the shape of the cover lens 3) and does not damage the rectangular image even when the light is turned on. Moreover, the shadow part at the boundary position between the multiple parabolic reflecting mirror surface 9 and the compound reflecting mirror section 10 is
By adjusting the widths of the parabolic reflecting surface E of 0 and the plane G receding from the parabolic reflecting surface, the widths of the shadows wl and w2 can be designed in a timely manner, and an approximate irradiation flux can be obtained. In addition, a single parabolic reflecting mirror surface 7 and a multiple parabolic reflecting mirror surface 9
There is no structural difference between the two.

In this embodiment, since the surface G formed by each concave annular reflecting mirror surface 10b is not a paraboloid, the light beam from the bulb 6 does not become parallel to the optical axis after reflection, but the inclination θ of this reflected light beam is
Since it is small, there is no problem in implementation.

FIG. 5 shows another embodiment of the composite reflecting mirror unit 10, in which four arcuate portions (horizontal rectangle ABCD and circumscribed 8 shows different structures of the parts (enclosed by circle 8).

This composite reflecting mirror section 10 is partitioned concentrically with the multiple parabolic reflecting mirror surface 9 at the same angles as P and P, and the partitioned portion is divided into convex annular reflecting mirror surfaces 10a, 10a... and the convex annular reflecting mirror surface. The concave annular reflecting mirror surface 10C, IOC, . . . are arranged adjacent to each other alternately.

10a... is a concave annular reflecting mirror surface 10c that is constructed along a parabolic reflecting surface (see arrow E) that is on a trajectory continuous from the single parabolic reflecting mirror surface 7.

10C... are located behind the parabolic reflecting surface E and are constructed along another parabolic reflecting surface H that shares the focal point F.

In this embodiment as well, the light beam from the bulb 6 is transmitted to the composite reflecting mirror section 10 constructed between the horizontally long rectangle ABCD and its circumscribed circle 7.
Due to the shadow of the light flux formed by the stepped structure, stripes that are very similar to the shadow of the light flux formed by the multiple parabolic reflecting mirror surface 9 appear, and the central part shines in a horizontally long rectangle, so that it harmonizes with the front shape of the lamp. Even when the light is turned on, the rectangular image is not impaired.

〔Effect of the invention〕

Since the automotive lamp having a multiple reflective mirror surface according to the present invention is constructed as described above, by configuring a composite reflective mirror section between the single parabolic reflective mirror surface and the multiple parabolic reflective mirror surface, it is possible to This has extremely excellent effects, such as improving the rectangular image when the lamp is turned on, which forms a horizontally long rectangular high-luminance area, and eliminating the step structure.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view of a lamp showing a first embodiment of an automotive lamp having a multi-reflection mirror surface according to the present invention, Fig. 2 is a front view of the same reflector, and Fig. 3 is a section ■ in Fig. 1. FIG. 4 is an explanatory diagram showing the irradiation state of the luminous flux by the same lamp; FIG. 5 is an enlarged cross-sectional view of main parts showing another embodiment of the present invention; FIG. FIG. 7...Single parabolic reflecting mirror surface 9...Multiple parabolic reflecting mirror surface 8...Circumcircle 0...Compound reflecting mirror part

Claims (1)

[Claims] In an automobile lamp, a lens is disposed in the front opening of a lamp body whose inner surface of the rear wall is formed as a reflector, and a lighting bulb is arranged on the optical axis inside the lamp chamber, and the reflective surface of the reflector is located at the center. a single parabolic reflecting mirror surface located at the central part of the unit, forming a reflecting surface consisting of a single parabolic curved surface having a substantially focal point at the bulb position, and having a rectangular front shape; A multiple parabolic reflecting mirror surface consisting of a plurality of parabolic reflecting mirror surfaces divided into a plurality of concentric circles with an appropriate pitch and sequentially stepped back in parallel to the optical axis toward the outer periphery on the outside of the circumscribed circle, and the single paraboloid. It is formed in four arc-shaped parts between the reflecting mirror surface and the multiple parabolic reflecting mirror surface,
The multi-parabolic reflecting mirror surface is partitioned concentrically at substantially the same pitch as the multi-parabolic reflecting mirror surface, and the partition has a structure in which a convex annular reflecting mirror surface and a concave annular reflecting mirror surface set back from the convex annular reflecting mirror surface are alternately adjacent to each other. 1. An automotive lamp having a multi-reflecting mirror surface, characterized in that it is composed of a composite reflecting mirror section.