JPS6239522Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention is a double-lens lamp such as a stop lamp that is installed on a vehicle such as an automobile, and is particularly suitable for use when installed inside the lamp. This invention relates to an inner lens.

(Prior Art) Various structures of this type of double-lens lamp are known, and one has a structure in which a mask is provided in front of the lens to prevent false reflection.
For example, the earlier application filed by the same applicant (Sho 50-120778)
(Utility Model Application No. 52-34683) discloses a lens provided with the same type of mask.

A part of this conventional lens a is shown in FIG. A fisheye-shaped convex lens cut a' is provided on the back side of this lens a, and opaque masks b are arranged at predetermined intervals on the front side.

In a lens with such a configuration, the larger the size of the mask b, the less external light enters, the fewer false reflections, and the fewer misidentifications.
It has excellent stability. However, the diffusion angle α of conventional lenses cannot be made very large due to light distribution standards, and is within the range of about 20° at most. Therefore, the parallel light c reflected by the reflector of the housing is refracted by the convex lens cut and diffused to the outside at a predetermined angle, effectively illuminating the front, but the direct light d from the bulb is It is blocked by mask part b and is not irradiated to the outside,
Since it is only the above-mentioned diffused light, there is no lateral irradiation, and there is a drawback that visibility from the side is poor.

(Purpose of the invention) The present invention was made in order to eliminate the drawbacks of the conventional example, and its purpose is to use not only the diffused light by parallel rays but also the direct light from the bulb to illuminate the side surface. The present invention aims to provide an inner lens for a vehicle lamp that improves visibility from the side.

(Structure of the invention) The invention made to achieve this purpose is:
Transparent parts and opaque mask parts are alternately and regularly formed on the front side, and fisheye-shaped convex lens cut parts are formed on the back side, and adjacent parts of the fisheye-shaped convex lens cut parts are formed in the mask part. In the inner lens of a vehicle lamp, the fisheye-shaped convex lens cut portion is formed at the same pitch as the light-transmitting portion, and a prism cut portion or a flat portion is formed in an adjacent portion thereof. This is an inner lens for a vehicle lamp, which refracts direct light at a predetermined angle by a prism cut part or a flat part formed adjacent to a convex lens cut, and directs the light away from the mask part and irradiates the side surface. It is possible to improve visibility from the outside.

(Embodiment) Next, the present invention will be explained in more detail based on the embodiment illustrated in FIG.
A bulb 3 is attached to the inside of the housing 2, and an inner lens 4 and an outer lens 5 are attached to the front side of the housing 2. The present invention particularly relates to the inner lens 4, which is made of a colored material having a luminescent color such as red, amber or clear.

As shown in the first embodiment in FIG. 3, this inner lens 4 has a fisheye-shaped convex lens cut 41 on the inside facing the bulb 3, that is, on the back side, and on the outer lens 5 side, that is, on the front side. A concave portion 42 having a short width and serving as a light transmitting portion is provided at the same pitch as the convex lens cut 41 and whose centers coincide with each other, and an opaque mask portion 43 is provided between these concave portions and corresponding to the adjacent portion of the convex lens cut 41. are provided regularly, and a prism cut portion 44 having a predetermined step angle θ is continuously formed adjacent to the convex lens cut 41. The opaque mask portion may be painted with a color tone different from the lens color, for example, black or the color of the vehicle body, or hot stamped with aluminum or chrome color.

When the inner lens 4 configured in this manner is used, the parallel light rays c reflected by the reflective surface of the housing 2 are refracted by the convex lens cut 41 and further diffused by the concave portion 42 on the front surface side at a diffusion angle α. Therefore, the parallel light rays c entering the inner lens 4 are not blocked by the mask portion 43 provided on the front surface side.
All of it will be radiated to the outside.

Direct light d from the bulb 3 passes through the prism cut section 4
4, it directly reaches the recess 42, is refracted further outward from the recess, and is eventually irradiated in the direction of the side surface of the lamp.

In the second embodiment shown in FIG. 4, the step angle θ of the prism cut portion of the first embodiment is set to 0.
In this case, the flat part 44a is provided adjacent to the convex lens cut 41, the concave part 42 on the front side provided at the same pitch as the convex lens cut 41 is conversely made into a convex part 42a, and there is a gap between the convex parts 42a. The mask portions 43 are arranged regularly.

Even in this second embodiment, the parallel light rays c are diffused, and the direct light d passes through the flat part 44a to the convex part 44.
It will be irradiated in the side direction from point a.

In the lens cut of the inner lens 4, the basic thickness is T, the width of the convex lens cut 41 is A, and the prism cut portion 44 or flat portion 44a
, the width of the concave portion 42 or the convex portion 42a is L, and the width of the mask portion 43 is M, then the relationship between L and M is as follows.

L=A-2D M=B+2D However, D=T×tan {sin ^-1 (sin α/η)} η is the refractive index of the lens. Then, if M>L is satisfied in the above relationship, the inner lens It is possible to extract the diffused light and the light irradiated to the side without changing the basic wall thickness or reducing the M of the mask portion, and moreover, it is possible to suppress false reflections.

(Effect of the invention) As explained above, the inner lens of the vehicle lamp according to the invention has a prism cut part or a flat part adjacent to the convex lens cuts provided on the back surface, so that direct light from the bulb can be removed. This direct light is directed to the concave or convex part on the front surface that becomes the light transmitting part, and the direct light is irradiated to the side, which has the excellent effect of greatly improving the visibility of the lamp from the side. It is something that plays.

Furthermore, it goes without saying that the convex lens cut effectively releases diffused light to the front side and prevents false reflection from sunlight.

[Brief explanation of the drawing]

Figure 1 is a partially enlarged cross-sectional view of a lens used in a conventional double-lens type lamp, Figure 2 is a cross-sectional view of a vehicle lamp using the inner lens of the present invention, and Figure 3 is a cross-sectional view of a vehicle lamp using the inner lens of the present invention. FIG. 4 is an enlarged view of the portion shown by the dotted line in FIG. 2 of the embodiment, and FIG. 4 is an enlarged view similar to FIG. 3 of the second embodiment. 1... Lamp, 2... Housing, 3... Bulb, 4... Inner lens, 5... Outer lens, 41... Fish-eye convex lens cut, 42, 4
2a... recessed part or convex part, 43... mask part, 4
4, 44a...prism cut part or flat part, c
...Parallel rays, d...Direct light.

Claims (1)

[Scope of utility model registration request] Transparent parts and opaque mask parts are alternately and regularly formed on the front side, and fisheye-shaped convex lens cut parts are formed on the back side, and adjacent parts of the fisheye-shaped convex lens cut parts are formed in the mask part. In the inner lens of a vehicle lamp, the fisheye-shaped convex lens cut portion is formed at the same pitch as the light-transmitting portion, and a prism cut portion or a flat portion is formed in an adjacent portion thereof. Inner lens for vehicle lighting equipment.