JPS581903A - Lamp apparatus for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp in which the brightness of the lens surface is made uniform and visibility is improved.

This type of wheel light uses direct light from a light source without using a rotating paraboloid shape that takes up space in order to reduce the depth and thickness of the light.
2 A front lens with a Fresnel prism formed in the irradiation system has been proposed for control by the front lens of the picture wall. Vehicle lights and equipment equipped with a front lens formed with this direct-ray 7-Resnel prism are conventionally the first. As shown in the example shown in the figure, a light source C is disposed in a lamp chamber defined by a housing a and a front lens b, and an outer lens d having a fisheye prism formed on the inner surface of the front lens bFi. , in order to control the emitted light (direct light) from the light source C as a light beam approximately parallel to the optical axis A so-called direct-ray system Fresnel prism equipped with 1. It consists of an inner lens f provided with a beam, and among the light emitted from the light (direct light), the angle lf that is incident on the inner lens f as shown in the Kosha diagram.
It is constructed so that a desired light distribution pattern can be obtained by applying the entrance, front, and direct illumination systems within the range a'.

3tl However, in such a conventional vehicle lamp, the lens surface is formed in a flat shape and is disposed in the howling a, so in particular, the light source of the nine direct ray system 7 Lennel prism is formed in the inner lens f. A radiation system (direct light) 11 in which light enters a nine-refraction prism g provided in the center facing C and a nine-reflection prism h provided in its periphery. Zuko's incident angle α0 is 9180 when the inner lens f is planar.
It cannot exceed °. Therefore, since the light incident on the inner lens f is within the range of angle a0, the light source C
As a result, the lens surface appears dark as a whole, and the light that enters the reflective prism h, which is far from the light source, falls within the angle β, which is a very small value compared to the value of the angle α0-. As a result, the amount of luminous flux is small (and the luminous flux density decreases), so the central area where the refractive prism g is installed looks bright from the outside, but the peripheral area where the reflective prism is designed becomes a dark area. , such dark areas are particularly noticeable in lamps with horizontal lens surfaces.
8-1903 (2) The existence of such a dark area □ reduces the brightness of the lens surface, and not only does a uniform light-emitting surface become unsightly and the lighting ring is unsightly, but also the display light distribution function of signal lights etc. is not sufficiently achieved. There are drawbacks such as poor visibility due to poor visibility.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wheel lamp that makes effective use of the luminous flux from the bulb, uniformizes the brightness of the entire surface of the lens, and has good visibility.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the implementation of a vehicle lamp according to the present invention will be explained below with reference to the accompanying drawings.

Figures 2 to #! The illustrated example in FIG. 4 is an example in which the present invention is applied to a tail light for an automobile, and is an IFi housing. The lever 5 is attached to the back cover 6 via a lever 52 into which a socket 51 is press-fitted. A fisheye prism portion 21m is formed on the inner surface of the front lens 2, and then an outer lens 21 is formed.
The inner lens 22 is provided with an inner lens 51 + lens ρ on its inner surface, and the inner lens 22 has a central portion 7 near the optical axis A refraction system prism section 22m is formed to control the emitted light (direct light) from the light source (filament) P of the bulb 5 to be approximately parallel to the optical axis X and output it to the outer lens 40, The outer peripheral part 8 of the central part 7 of the inner lens 4
A refraction system prism portion 22b is formed on the outer surface of the light source (a portion far from the light source P) for controlling a large amount of incident light from an optical means to be described later to be substantially parallel to the entire optical axis X.

Further, the optical means for making a large amount of high-density light beam incident toward the refractive prism part 22b formed in the outer part 6 far from the light source P' is composed of a first υ lens 3 and a second lens 4. 9. The optical means is disposed on the side of the bulb 5 substantially parallel to the optical axis X. More specifically, on the bulb 5 side, the optical means is provided with a lens 3 having seven lens cuts 31 formed on the outer surface thereof centered on the horizontal axis Y of the bulb 5 perpendicular to the optical axis X, and a lens 3 on the outer side thereof. A second lens 4 is disposed parallel to the second lens 3, and the second lens 4 is arranged parallel to the second lens 3.
7-renel cut 41 is formed on the outer surface. Further, K is a 7-lens cutlet formed on the outer surface of the first lens 3.) 31 is a second lens provided outward from which the light emitted from the light source P is emitted.
The beam is formed to be emitted substantially parallel to the horizontal axis Y toward the lens 4, and the substantially parallel light beam incident on the second lens 4 is directed to the outer periphery of the first inner lens n by a round cut 41 formed on the outer surface. The prism is designed to allow a large amount of light to enter the refractive prism section 22b formed in the section 8.

Note that the relationship between the optical shape of the Fresnel cap formed on the outer surface of the first lens 3 and the second lens 4 of the optical means and the refractive system prism 5 part 22b provided on the outer peripheral part 8 of the 31.41Fi inner lens B is゛Si circumcentric circle.

It is sufficient to arbitrarily set a 7-layer cut such as a lattice shape or a cylindrical shape.

In addition, when a 7 Lennel prism is applied to the inner surface of the inner lens n, a refractive prism is formed in the central portion 7 of the lens in order to control the emitted light into approximately parallel rays. A reflective prism portion is formed on the outer periphery s8. This means that the 7-lens cut 41 formed on the outer surface side of the second lens 4 of the optical means
It is determined by the angle of the incident light from.

Since the structure is as described above, the optical effect when the pulp 50 is lit is as shown in Figs. As shown, a refractive prism @ 22a is formed on the outer surface of the central portion 7 near the optical axis X facing the pulp 5 of the inner lens n.
A large amount of light flux with high K light flux density is incident on the flat surface of the inner surface,
The light passes through the wall thickness and enters the refractive system grism section 221 K on the outer surface, and is refracted into a ray substantially parallel to the optical axis X, and then enters the outer lens 21.
It will be emitted at 00,000. Furthermore, among the light emitted from the light IIP, the side light, that is, the side light, enters the Fresnel cut 31 formed on the outer surface of the first lunion 3 of the optical means, as shown by broken lines in the figure. The cut 31 controls the beam i1 to be approximately parallel to the horizontal axis Y, and the beam is emitted toward the second lens 4.
The light enters the 3-nons 4, passes through the wall thickness, and emits a large amount of high-density luminous flux through the 7-lens cut 41 on the outer surface toward the outer peripheral portion 8 far from the light source of the inner lens n.
The light beams are incident on the flat surface of the inner surface, transmitted through the 11th thickness, controlled to be substantially parallel to the optical axis X by the refractive prism section 22b on the outer surface, and emitted toward the outer lens 21. Fisheye prism 9 of outer lens 21
21&, the light is diffused and emitted to the front of the lens to form a desired light distribution pattern.

Therefore, in the vehicle lamp of the present invention, as shown in FIG. 4, the forward light from the light source P is incident on the central portion 7 near the optical axis X of the inner lens n within the range of angle a01 shown by the solid line in the figure. As in the conventional case, a light quantity with a relatively high luminous flux density is incident. Furthermore, the side light from the light source P is formed on the outer surface of the first lunse 3 of the first optical arm disposed near the pulp 5, and the beam in the range of angle a02 shown by the broken line is formed on the outer surface of the lunches 3 of the first optical arm disposed near the pulp 5. A beam IIK is controlled to be substantially parallel to the axis Y, and is arranged outside the second lens 4, and is formed outside 11 of the second lens 4, and a large amount of light with a degree of W is made incident toward the outer circumferential portion 8 by a lens cut 41. be able to.

Therefore, the emitted light (direct light) from the light source P has an angle a01+
It is possible to make effective use of the luminous flux in the range of 002, and the effective luminous flux angle f is the angle fa'', 10a', > tsoo.In addition, in this example, a 7 Lens prism is installed on the outer surface. Since the portions 22m and 22b are formed, the structure can be constructed with less loss of light.

Therefore, when a large amount of light flux with high luminous flux density is made to enter the outer part 118 of the lens 2, a dark part does not occur on the outer periphery s8, and the luminance of the entire surface of the lens can be made uniform, making it possible to make visual recognition easier. This provides effects such as being able to obtain a vehicle lamp with good properties.

In this example, the optical means for making a large amount of light beam incident on the outer circumference 8 of the inner lens ρ constitutes the first lens 3 and the second lens 4, and the IRI lens 3 and the second lens 4 respectively Although the description has been made of a lens K in which 7-lens cuts 31 and 41 are formed on the outer surface of the lens, the present invention is not limited to this. A Fresnel cut 41 may be formed on the outer surface side.Furthermore, the optical means having the first lens 3 and the second lens 4 is provided with a housing.
The pulp 5 is placed on the pack cover 6 or by an appropriate means.
It is arranged on the side of the optical axis substantially parallel to the optical axis. In addition, as in this example, in a lamp with a double lens structure of an inner lens holder, when a lattice-shaped Fresnel prism is formed on the inner or outer surface of the inner lens n, the outer lens 21 is a cover lens. Further, a Fresnel prism portion may be formed on the circular surface of the inner lens n, and a fisheye prism portion may be formed on the outer surface, or the lens 2 may be constructed of one piece.

As is clear from the above-described embodiments, the vehicle lamp of the present invention is a lamp in which a light source is disposed within a lamp chamber defined by a housing and a lens disposed in front of the housing, and the lens is provided with a Fresnel prism. an optical means 11,j for making a large amount of high-density light beam incident on the outer peripheral part of the lens far from the light source;

The optical means is arranged on the side of the light source substantially parallel to the optical axis, and the optical means controls the side light from the light source into substantially parallel light beams and directs the incident light of the second run toward the outer peripheral portion. Since the present invention is characterized by comprising a second lens that controls the output of the light, the present invention can eliminate the conventional problems and effectively utilize the luminous flux of the bulb. There are no dark areas that occur, and therefore the lens
There are effects such as being able to provide a wheel lamp with uniform brightness over the entire surface and good visibility.

[Brief explanation of the drawing]

Fig. 1 shows an explanatory view of a conventional lamp, Figs. 2 to 4 show an embodiment of the wheel lamp of the present invention, Fig. 2 is a front view of the lamp, and Fig. 3 is a sectional view of main part #i. 4 are explanatory diagrams showing the optical effect. l...housing, 2...lens, 4...outer lens, n...inner lens, 22a #22
b...Refraction system burr, rhythm part, 3.4...th runz,
#I2 lens (optical means), 5... pulp, P...
Light-17...Outer periphery, 10...Light chamber, X...Optical axis. JP-A-58-1903 (4)' Patent applicant: Ichikoh Industries, Ltd.

Claims (1)

[Claims] A light source is arranged in a lamp chamber formed by a housing and a lens disposed in front of the housing, and a 7 Lennel prism part is formed in the lens, and a density is formed in the outer peripheral part of the lens far from the light source. An optical means for allowing a large amount of light flux to enter is disposed on the side of the light source substantially parallel to the optical axis; , and a second lens for controlling the incident light from the second lens toward the external part.