JPH0347204Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a vehicle lamp in which an outer lens and an inner lens are fixed to a lamp body at a predetermined interval, and a light transmission area of a desired shape is formed on the inner lens. Regarding.

[Prior art]

Conventionally, various vehicle lamps of this type have been implemented, including those shown in FIGS. 4 and 5, and FIG. 4 shows one of the conventional vehicle lamps. FIG. 5 is a sectional view taken along the line shown in FIG. 4.

In these figures, reference numeral 1 denotes a lamp body with a built-in bulb 2. A lens adhesive groove 3 is provided around the periphery of the rectangular opening of the lamp body 1, and an outer lens 5 is adhered to this groove 3. has been done. An inner lens 4 bonded to the lamp body 1 is disposed inside the outer lens 5 at a predetermined interval. Fresnel steps 6 are formed concentrically on the back surface of the inner lens 4, and fisheye steps 7 are formed in a checkerboard pattern on the back surface of the outer lens 5. A light-shielding bead portion 8 is provided inside the groove 3 to protrude from the inner surface of the lamp body 1, and this bead portion 8 blocks light from entering the inner lens end portion 4a, so that a rectangular light beam is formed on the inner lens 4. A transparent area 10 is adapted to be formed. In the light transmission area 10 of the inner lens 4, the light from the bulb 2 is distributed into a substantially parallel beam by the Fresnel step 6, and then a desired rectangular light emitting pattern 1 is formed on the surface of the outer lens 5.
1 is formed.

[Problem that the invention attempts to solve]

However, in the configuration of the vehicle lamp, light obliquely enters from the gap d between the light-shielding bead 8 and the inner lens 4 at the end 4a of the inner lens, as shown by the symbol A, and passes through the outer lens 5. Put it away. Therefore, the peripheral part 11a of the light emitting pattern
There were problems in that the light emitting pattern 11 was blurred and the light emitting pattern 11 could not be formed clearly, resulting in poor visibility.

Further, the gap d differs depending on how the inner lens 4 and the outer lens 5 are assembled, and there is also a problem in that the light emitting pattern 11 varies even among lamps of the same type. Further, even if the light-shielding bead portion 8 is made high so as to eliminate the gap d, there is a limit to how clearly the light-emitting pattern 11 can be made because light enters the inner lens end portion 4a obliquely.

The present invention was devised in view of the problems of the prior art, and its purpose is to provide a vehicular lamp in which a light emitting pattern is formed in a desired shape, thereby eliminating variations in the light emitting pattern.

[Means for solving problems]

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

The gist of the configuration of the present invention is that a prism step 18 is formed around the entire periphery of the inner lens 13 to prevent light from passing in the direction of the outer lens 14.

[Effect]

During lighting, the light incident on the prism step 18 forming area 13a of the inner lens 13 is totally reflected or refracted and transmitted by the prism step 18 forming surface, and is diffused laterally as shown by the symbol B. Therefore, the prism step forming area 13a
Almost no light is emitted from the outer lens 14 toward the outer lens 14, and the light emitting pattern 25 is formed in a desired shape.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a sectional view showing a vehicle lamp according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In these figures, reference numeral 1 denotes a lamp body with a built-in bulb 2. In the rectangular opening of the lamp body 1, an inner lens 13 with a Fresnel step 6 formed on the back side and a fisheye step 7 on the back side are installed. The formed outer lenses 14 are arranged at predetermined intervals. A frame-shaped side wall 14a is formed on the outer periphery of the back surface of the outer lens 14, and the lower end of this side wall 14a is fixed to the body 1 with an adhesive 16a in an adhesive groove 16 formed in the lamp body 1. ing. A reinforcing rib 15 is formed on the peripheral edge of the inner lens 13, and a portion of this rib 15 protrudes downward, and serves as an inner lens adhesion foot 15a, and is attached to the engaging portion 15b formed on the lamp body 1. It is glued to 1. Note that although the inner lens 13 is formed with four legs 15a, only one side cross section of the lamp is shown in the figure, and only one leg 15a is visible.

A prism step 18 having a sawtooth cross section is formed on the outer peripheral surface of the rectangular lens portion of the inner lens 13. This prism step 1
8, as shown in FIG. 3, the prism step forming surface is constituted by a protrusion having a triangular cross section and consisting of a reflective slope 19 and a transmission slope 20.
From the bulb 2 to this prism step forming area 13
The directions of the lights l ₁ and l ₂ heading toward a have a substantially constant angle θ even after they enter the inner lens 13, and for example, the angle θ is set so that the slope 19 has a critical angle or more with respect to the incident lights l ₁ , l ₂ . It is set. Therefore, the light l ₁ , l ₂ ...
The light is totally reflected or refracted and transmitted at the prism step forming surface, and most of the light is directed in the direction shown by reference numeral B in FIG. 1 and passes through the inner lens side wall 14a toward the left in FIG.

In this way, in the prism step 18, by directing the light to the side of the outer lens 14, the light passing through the prism step forming area 13a and heading toward the outer lens 14 is blocked, thereby preventing the light from passing through the non-light transmitting area 22. It is now possible to form a A rectangular light transmitting area 23 is formed inside this non-light transmitting area 22, and as a result, a light emitting pattern 25 is clearly formed in a predetermined area of the outer lens 14 corresponding to this light transmitting area 23.

Note that reference numeral 24 is a stud bolt for attaching the lamp to the vehicle body, and this stud bolt 24 is provided at a position close to the outer lens adhesive groove 16.

Next, the operation of the above configuration will be explained.

When lighting, the light incident on the surface of the inner lens 13 on which the Fresnel step 6 is formed becomes parallel light and enters the outer lens 14, and the light enters the fisheye step 7.
The desired light distribution pattern 2 is diffused by the action of
5 is obtained. On the other hand, as shown in FIG. 3, the light incident on the prism step 18 forming area 13a of the inner lens 13 is totally reflected or refracted and transmitted through the prism step 18 forming surface and exits to the side. A rectangular ring-shaped non-light transmitting area 22 as shown in FIG. 2 is formed. As a result, a rectangular light transmitting area 23 is formed inside this non-light transmitting area 22 of the inner lens 13, and a rectangular light emitting pattern 25 is formed on the surface of the outer lens 14.

In addition, when assembling the lamp to the vehicle body, in the past it was not possible to install stud bolts because a light-shielding bead was formed, but in this implementation, there is no need for a light-shielding bead, so there is sufficient space. By providing the stud bolt 24, etc., the degree of freedom in mounting the lamp to the vehicle body increases.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made.

[Effect of idea]

As is clear from the above explanation, according to the present invention, a prism step is provided around the entire circumference of the inner lens to prevent light from passing toward the outer lens. can be set. Therefore, variations in the light emission pattern due to lens assembly can be eliminated, and the light emission pattern can be tightly formed in a desired shape.

Furthermore, since the light-shielding bead portion is not required, a stud bolt or the like can be provided, and structural restrictions on the lamp body due to the presence of the light-shielding bead portion can be eliminated.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a vehicle lamp according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view explaining the action of the prism step, and Fig. 4 is a conventional vehicular lamp. A plan view of the lamp, and FIG. 5 is a sectional view thereof. 1...Lighting body, 13...Inner lens,
14... Outer lens, 18... Prism step, 22... Non-light transmitting area, 23... Light transmitting area, 25... Light emitting pattern.

Claims (1)

[Scope of utility model registration request] In a vehicle lamp in which an outer lens and an inner lens are fixed to a lamp body at a predetermined interval,
A vehicle lamp characterized in that a prism step is formed around the entire circumference of the inner lens to prevent light from passing toward the outer lens.