JPS6350729Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vehicular lamp suitable for use in, for example, a signal light such as a combination lamp for an automobile.

[Background of the idea]

Figure 4 shows one of the combination lamps for automobiles.
A sectional view of an example taken along a horizontal plane is shown, in which 1 is a lamp housing and 2 is a light source bulb. An inner lens 3 covering the front opening of the lamp housing 1;
The outer lens 4 is attached. FIG. 5 is a perspective view extracting and showing the inner lens 3 in the conventional example.

3a is a flat part near the front of the inner lens;
b is a planar part near the periphery, and 3c is a curved part (more specifically, a cylindrical part) formed between the two planar parts.

In general, a vehicle lamp having such a structure refracts the light emitted from the light source bulb 2 in parallel to the optical axis Z-Z by the inner lens 3 (that is, converts it into a parallel beam of light directed toward the front of the lamp), and refracts the light emitted from the light source bulb 2 by the outer lens 4. This structure allows the light to be dispersed appropriately.

In the vehicle lamp described above, it is effective to provide a prism on the inner lens 3 in order to uniformly emit light from the front surface of the lamp and to increase the amount of light as much as possible. There are technical difficulties in providing the following.

FIG. 6 is an enlarged cross section of the inner lens 3. FIG. 7 shows a further enlarged view of a portion A of the planar portion 3b around the figure.

5 is a prism provided on the peripheral planar portion 3b, 5a is an inner surface of the prism, and 5b is an outer view of the prism. Z-Z is the optical axis, and zz is an axis parallel to the optical axis.

The light incident from the light source bulb as shown by arrow A is refracted by the inner surface 5a of the prism as shown by arrow B, reflected by the outer surface 5b as shown by arrow C, and the optical axis is reflected by the lens surface 3b-1 as shown by arrow D. When an attempt is made to refract the prism in the Z-Z direction, the inner surface 5a of the prism is tilted by each angle θ with respect to the zz axis, as shown in this figure.

For this reason, if the prism 5 having the shape shown by the solid line in FIG. 7 is constructed by injection molding, it will be extremely difficult to mold it.

[Purpose of invention]

This idea was created in view of the above circumstances.
It is an object of the present invention to improve a vehicular lamp equipped with a prism lens having a curved portion, and to provide a vehicular lamp in which the prism lens can be easily configured.

[Summary of the idea]

First, the basic principle of the present invention created to achieve the above purpose will be briefly described.

As described above, it is difficult to injection mold the prism 5, which has the inner surface 5a that is inclined as shown by the solid line in FIG. For example, when the prism lens 5 is constructed by cutting out the prism lens 5, if the entire prism lens is bent as shown by the arrow B and the entire prism lens is made into a flat shape as shown by the imaginary line, the prism 5 will move to the imaginary line 5. ' position and orientation, and the shape is easy to injection mold.

The present invention reversibly utilizes the above-mentioned action. First, as shown by the imaginary line, a planar prism with a prism 5' having a shape that can be easily cut out is constructed, and this is moved in the opposite direction of arrow B. Flex it to form the shape of a solid line.

In order to achieve the above object (a prism lens having a curved part and having an easy structure) based on the above-mentioned principle, the vehicle lamp according to the present invention includes a prism lens having a flat part and a curved part. In the provided vehicle lamp, a planar prism lens is made of a flexible transparent material, and a reinforcing rib is partially provided along at least one side of the planar prism lens to increase rigidity, The present invention is characterized in that a bending force is applied to this ribbed planar prism to curve the portions without reinforcing ribs, and the prism is attached and fixed to the lamp housing.

[Example of idea]

Next, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 2, the inner lens 6 has an almost flat overall shape. A prism is integrally arranged on one side (the lower side in FIG. 2) of the inner lens 6, and is injection molded with flexible transparent plastic. The above prism is
As illustrated by the imaginary line 5' in FIG. 7, it is configured to have a shape that can be easily cut out so that it takes on the desired shape when it is bent. The planar inner lens 6 has reinforcing ribs 6a and 6b integrally formed at both ends along one side thereof.

When the left end of the inner lens 6 provided with the reinforcing ribs 6a and 6b as described above is firmly held and a downward bending force is applied to the right end as shown by arrow C,
Since both ends where the reinforcing ribs 6a and 6b are provided have high rigidity, stress is concentrated in the central part and only this part is curved, and as shown in FIG. portion 6d, and intermediate curved portion 6
e is formed. FIG. 3 is a sectional view of a vehicle lamp provided with the inner lens 6 shown in FIG. 1, and corresponds to FIG. 4 in the conventional example.
The lamp housing 1, light source bulb 2, and outer lens 4, which are given the same drawing reference numbers as in FIG. 4, are the same or similar structural members as in the conventional example. Inner lens 6 configured by applying the present invention
Any known means can be used to attach the lamp housing 1 to the lamp housing 1, such as screws, rivets, adhesives, etc.

[Effect of idea]

As described in detail above, when the present invention is applied, it is possible to easily construct a vehicle lamp equipped with a prism lens having a curved portion, which is an excellent practical effect.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the vehicle lamp of the present invention, FIG. 1 is a perspective view of a prism lens in a bent state, and FIG. 2 is a perspective view of a prism lens in an unbent state. , FIG. 3 is a horizontal sectional view.
FIG. 4 is a horizontal cross-sectional view showing an example of a conventional vehicle lamp, FIG. 5 is a perspective view of the prism lens of the conventional example, FIG. 6 is a cross-sectional view of the prism lens, and FIG.
The figure is an enlarged view of the vicinity of section A in FIG. 6. 1...Lamp housing, 2...Light source bulb,
3... Inner lens, 3a, 3b... Planar part,
3c...Curved portion, 4...Outer lens, 5...Prism, 5a...Inner surface, 5b...Outer surface, 6...
...Inner lens, 6a, 6b...Reinforcement rib, 6c
...Front planar part, 6d... Surrounding planar part,
6e...Curved portion.

Claims (1)

[Scope of utility model registration request] In a vehicle lamp equipped with a prism lens having a flat part and a curved part, the flat prism lens is made of a flexible transparent material, and a part of the prism lens is partially formed along at least one side of the flat prism lens. A vehicle characterized in that the ribbed planar prism is provided with reinforcing ribs to increase its rigidity, and a bending force is applied to the ribbed planar prism to curve the part where there is no reinforcing rib, and the prism is attached and fixed to the lamp housing. Lighting equipment.