JPH0359521B2 - - Google Patents

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 kind in a thinned state, in which a light source 22 placed approximately at the center of the lamp 21 and a Fresnel lens 23 with this light source 22 as a focal point are arranged in parallel. The light distribution characteristic required for this lamp 21 is formed by obtaining the light beam and making a lens cut on the outer lens 24 provided in front of the light beam.

[Problem to be solved by the invention]

However, the lamp 21 with the conventional configuration described above
The thinner the light source 2 is, that is, the closer the distance between the light source 22 and the Fresnel lens 23 is, the more the light source 2 that enters the periphery of the Fresnel lens 23 becomes smaller.
The incident angle of 2 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 problem of the decrease in the amount of peripheral light cannot be ignored, and the current state of use is practically at its limit, and vehicle manufacturers and other market Although there is a strong desire to make the device thinner, it has been considered impossible to make it any thinner, creating the problem that market demands cannot be met. Additionally, compared to lamps that use reflectors, 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, making it even more difficult to make them thinner. It has become something to do.

[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 according to the present invention;
For example, three reflective surfaces 2a, 2b, and 2c are combined. The reflective surfaces 2a, 2b, 2c will be explained in more detail below.
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, i.e. It is a parabolic prism that has curvature only in the direction perpendicular to the long side, and by forming it in this way, even in shapes with extremely large aspect ratios, such as the rectangular shape described above, the reflective surfaces 2a, 2
This makes it possible to form a reflective surface covering the entire surfaces of 2c and 2c. Light sources 3a, 3b, 3c are disposed to substantially coincide with the focal line LF of each of the reflective surfaces 2a, 2b, 2c. The action of the reflecting mirror 2 explained above is explained by the reflecting surface 2a.
and the light source 3a, the reflective surface 2a
In the short side direction, the light source 3a has a parabolic curvature as shown in FIG. 2, so the light source 3a becomes parallel light, which is directed toward the irradiation direction. On the other hand, since there is no curvature in the long side direction as shown in FIG. 3, the light source from the light source 3a reflected on the reflecting surface 2a is completely equivalent to being reflected by a plane mirror. This results in point radiation emitted from the virtual image P of the light source 3a generated behind the reflective surface 2a. Therefore, these reflective surfaces 2
The reflecting mirror 2, which is a collection of elements a, 2b, and 2c, also emits reflected light having the same properties. The entire surface of the reflecting mirror 2 is covered with a Fresnel lens, but as explained above, the reflecting mirror 2
However, in this embodiment, since the horizontal direction is parallel light and the vertical direction is point radiation, the Fresnel lens only needs to act in the vertical direction, and therefore the focal line LF If a Fresnel cut having an end point at the virtual image P on a surface including the virtual image P is formed by collecting a refractive prism and a reflecting prism, and this is a linear Fresnel lens 4 extending in the horizontal direction, the light source 3a, The light beams from 3b and 3c are integrated as parallel light beams and are incident on the outer lens 5, and the outer lens 5 can be provided with a conventional lens cut.

[Effect]

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 becomes possible to form a reflective surface with a short focal length, thus making it easier to reduce the thickness. Furthermore, since the number of light sources is increased in accordance with the above-mentioned division, it is possible to reduce unevenness in brightness that occurs on the light emitting surface.

【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 achieve high division and reduce the number of divisions.
This has the excellent effect of eliminating unnecessary complication of the structure and avoiding factors such as increased costs. Further, the number of light sources increases with the above division, and this 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 drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the vehicle signal lamp according to the present invention, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. 3 is the same as in FIG. FIG. 4 is a cross-sectional view taken along the - line, and FIG. 4 is a cross-sectional view showing a conventional example. 1...Vehicle signal lamp, 2...Reflector, 2a,
2b, 2c... Reflective surface, 3a, 3b, 3c... Light source, 4... Linear Fresnel lens, 5... Outer lens.

Claims (1)

[Claims] 1. A plurality of parabolic cylindrical reflectors that divide the light emitting surface of the 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 parabolic cylindrical reflectors. , 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.