JPH02123606A - Signal lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To eliminate the luminance unevenness caused by constituting the light emitting surface of a lighting fixture from strip reflecting surfaces, and to thin the lighting fixture by forming each reflecting surface into a parabolic prism to provide the reflecting surface having a short forcal distance. CONSTITUTION:Reflecting surfaces 2a-2c formed by distributing the light emitting surface in strip are the paraboloids having the forcal line LF, and light sources 3a-3c are located so as to coincide with the forcal line LF. The refraction prism and the reflection prism are gathered to form the Fresnel cut having the forcal point at the virtual image P on the surface comprising the forcal line LF and the virtual image P, and the Fresnel cut is extended in the horizontal direction to be a liner Fresnel lens 4. Since the beam from the light source 3a-3c are unifired as the parallel beams and are threw to an outside lens 5, the lens 5 may be cut as same as the conventional cut. In this structure, the light fixture thin and having a little luminance unevenness can be obtained.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a signal light, such as a taillight, which is mounted on a vehicle such as an automobile, and particularly aims to provide a structure suitable for thinning.

[Conventional technology]

FIG. 4 shows the structure of a conventional lamp 21 of this type in a thinner state, which includes a light source 22 placed approximately at the center of the lamp 21, and a Fresnel lens 2 with this light source 22 as a focal point.
3 to obtain parallel light rays, and the lens cut made on the outer lens 24 provided in front of the parallel light rays forms the light distribution characteristics required for this lamp 21.

[Problem to be solved by the invention]

However, as the lamp 21 having the conventional configuration described above becomes thinner, that is, as the distance between the light source 22 and the Fresnel lens 23 becomes closer, the Fresnel lens 23
The angle of incidence of the light source 22 that enters the 0 peripheral area becomes shallow, leading to a decrease in the amount of peripheral light. Therefore, when trying to make the lamp 21 thinner while maintaining the conventional configuration, the above-mentioned problem of a decrease in the amount of peripheral light cannot be ignored.
Practically speaking, the state in which it is currently being used is close to its limit, and although there is a strong demand for thinning in the market such as vehicle manufacturers, it is believed that it is impossible to make the thickness any thinner. This created the problem of not being able to fill the gaps. Furthermore, - compared to lamps that use a reflective mirror in the film, lamps that use the Fresnel lens 23 tend to have a lower luminous flux utilization rate, and this becomes more noticeable as they become thinner. It has become difficult.

[Means to solve the problem]

As a specific means for solving the conventional problems described above, the present invention provides a plurality of parabolic column reflecting mirrors that divide the light emitting surface of a lamp into strips and have a focal line along the long side direction, and A light source disposed near the focal line of each of the columnar reflectors, and a linear Fresnel lens that covers the light emitting surface and focuses on a virtual image of the light source reflected by the parabolic columnar reflector. The above-mentioned conventional problems are solved by providing the characteristic vehicle signal lamp.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. What is indicated by the reference numeral 1 in FIG. 1 is a vehicle signal light fixture of the present invention, and this vehicle signal light fixture 1 (hereinafter abbreviated as the light fixture 1) is provided with a reflecting mirror 2. 2 is a plurality of reflective surfaces, for example, three reflective surfaces 2at according to the present invention.
It is a combination of 2bs and 2c. Below, the reflective surfaces 2 at 2 b12 c will be explained in more detail.These reflective surfaces 2a and 2b. 2c is formed by dividing the light emitting surface into strips, and the shape is a paraboloid with a focal point, that is, a focal line LF, running along the long side of the strip, that is, It is a parabolic prism that has curvature only in the direction perpendicular to the long side described above, and by forming it in this way, even in shapes with extremely large aspect ratios such as the rectangular shape described above, the reflective surface 2
This makes it possible to form a reflective surface covering the entire surface of a12bx2c. Light sources 3at 3bs 3c are arranged to substantially coincide with the focal line LF of each of the reflective surfaces 2 ai 2 bs 2 c. The action of the reflecting mirror 2 explained above is explained by the reflecting surface 2a and the light source 3.
To explain using the example of point a, the short side of the reflecting surface 2a has a parabolic curvature as shown in FIG. Become something. On the other hand, since it has no curvature in the long side direction as shown in FIG. 3, the light source 3 reflected on the reflective surface 2a
The light ray from a is exactly equivalent to being reflected by a plane mirror, so that a light source 3a is generated behind the reflecting surface 2a.
It becomes point radiation light emitted from the virtual image P. Therefore, the reflecting mirror 2 which is an aggregate of these reflecting surfaces 2a12b12c
will also emit reflected light with the same properties. The entire surface of the reflecting mirror 2 is covered with Fresnel lenses, but as explained above, in this embodiment, the reflecting mirror 2 emits parallel light in the horizontal direction and point radiation in the vertical direction. Therefore, the Fresnel lens only needs to act in the vertical direction, and therefore the focal line LF
If a Fresnel cut having a focus on the virtual image P is formed by collecting a refractive prism and a reflecting prism on a surface including the virtual image P, and this is a linear Fresnel lens 4 extending in the horizontal direction, from the light source 3a13b13c. The light rays are integrated as parallel light rays and are incident on the outer lens 5, and the outer lens 5 can be a lens cut similar to the conventional one.

[For production]

In this way, by dividing the light-emitting surface of the lamp 1 into strip-shaped reflective surfaces and making these reflective surfaces into parabolic columns, it is possible to form a reflective surface with a short focal length, which makes it easy to reduce the thickness. . Further, since the number of light sources is increased according to the above-mentioned division, unevenness in brightness occurring on the light emitting surface can also be reduced.

【Effect of the invention】

As explained above, according to the present invention, when the light emitting surface of a lamp is divided to make it thinner, the reflective surface formed on the divided surface is a reflective surface of a parabolic column, so that the aspect ratio such as a rectangular shape can be improved. It is possible to reduce the number of divisions by making it possible to divide the structure with a high degree of division, thereby eliminating unnecessary complication of the structure and having the excellent effect of avoiding factors such as increased costs. . Also, with the above division, the number of light sources will also increase,
It also has the effect of reducing uneven brightness on the light emitting surface, which tends to occur in this type of thin lamp.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of a vehicle signal lamp according to the present invention, and FIG. 2 is a diagram showing ■-■ in FIG.
3 is a sectional view taken along the line m--■ in FIG. 1, and FIG. 4 is a sectional view showing a conventional example. 1...Vehicle signal lamp 2...Reflector 2 az 2 bz 2 c" Reflective surface 3 av 3
bz 3 c” Light source 4...Linear Fresnel lens 5...Outer thins @Figure 1 @Figure 2/- Figure 3 Figure 4

Claims (1)

[Claims] a plurality of parabolic columnar reflecting mirrors that divide the light emitting surface of the lamp into strips and each having a focal line along the long side direction; a light source disposed near the focal line of each of the parabolic columnar reflecting mirrors; A vehicle signal lamp comprising: a linear Fresnel lens that covers the light emitting surface and focuses on a virtual image of the light source reflected by the parabolic column reflector.