JPS5812204A - 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 wheel light, and more particularly to a vehicle light that uses IrI to make the brightness of the lens surface uniform and improve visibility. A vehicle lighting device that controls the direct light emitted from the light source by forming a direct-ray Fresnel grism directly on the screen lens without using a single-node reflector in the shape of a paraboloid of revolution that takes a sweep to make it shallow and thin. Proposed. ``A vehicle lamp equipped with a front lens formed with a direct-light Fresnel grism conventionally has a lamp chamber 1ζ defined by a housing a, a front lens, and eb, as illustrated in FIG.
A light source C is arranged, and an outer lens having a fisheye prism formed on the front surface, an LED, and a light source C.
In order to control the emitted light (direct light) from the light source as a ray approximately parallel to the optical axis It is composed of an inner lens Jef forming a direct-infrared Fresnel prism, and among the light emitted from the light source C (direct light), the light incident on the inner lens f is incident at an angle α0 as shown in the figure, forming a direct-input system. The Fresnel grism is configured to make the light substantially parallel to the optical axis X, and to condense the light into the fisheye grism fist of the actor lens d to obtain a desired light distribution.

However, in such a conventional vehicle lamp, the front lens b is formed into a flat shape and is disposed in the housing a, so that a direct-light Fresnel grism with an inf-V lens fVc is formed. The central part r facing the light source e of
The radiation light (direct light) that enters the refraction prism section g provided in c and the reflection prisms h and h' provided on its outer periphery only enters within the range of angle α0 as shown in the figure. Since the inner lens f is planar, this angle of incidence αO cannot necessarily exceed 180'. Therefore, since the light incident on the inner lens t is within the range of angle α0, the utilization rate of the luminous flux from the light source C is low, so the entire lens surface is dark, especially the reflective prisms h and h on the outer periphery far from the light source C. The light incident on the angle .beta.3 is within the range of angle .beta.3, which is a much smaller value than the value of the angle .alpha.0. That is, in the outer peripheral part of the inner lens f that is far from the light source C, the amount of luminous flux from the light source C is small and the density of the luminous flux decreases. It looks bright when you look at it, but there are dark areas around the outer periphery.The existence of such dark areas causes uneven brightness on the lens surface, making it impossible to obtain a uniform brightness surface over the entire lens surface, making the lighting filling look unsightly. Although the display function of signal lights and the like is not fully achieved, there are drawbacks such as reduced visibility.

The present invention has been developed in view of the above-mentioned circumstances, and the present invention effectively utilizes the luminous flux from Parno, eliminates dark areas that occur particularly in the outer peripheral part of the lens far from the light source, uniformizes the brightness of the entire lens surface, and improves visibility. The purpose of the present invention is to provide a wheel lamp with improved performance.

Embodiments of the vehicle lamp according to the present invention will be described below with reference to the accompanying drawings.

The illustrated example in FIG. 2 is a cross-sectional view of the main part in which the present invention is applied to a tail light for an automobile, where l is a housing l, and a lamp 2 is defined by a lens 2 disposed on the front surface of the housing l. A light source 5 is connected to a holder 52 through a socket 51 in the chamber IO.
installed and located on the The forward-facing lens 2 consists of an outer lens (cover lens) 21 and an inner lens n on the inside thereof, and the outer surface of the inner lens n has a fisheye! A rhythm part 22m is provided, and a direct-ray Fresnel prism part n is formed at the center part 6 near the optical axis X (reference axis of the lamp) facing the light source 5 on the outer surface, and the outer periphery far from the light source 5 around the center part 60. The parts 7 and 8 have a flat part 22
o, 224 are formed ◎ And, the optical means 3.4 which makes a large amount of light beam incident toward the flat parts 22a, 22d of the outer peripheral part 7.8 far from the light source 5 of the inner lens-f22 are formed with the light source 5, respectively. Both 1
IIK is arranged, and its optical means 3.4 is composed of first side lenses 31, 41, #12 side lens blades, 42, and a reflective lens 33.43 on the side of the light source 5.
The 1111-sided lens 31.41 has a Fresnel cut 31 on its inner surface that refracts the light emitted laterally from the light source 5 (@sword tip) into a ray approximately parallel to the horizontal axis Y orthogonal to the optical axis X.
m, 41m are formed, and cylindrical prism parts 31b, 41 are formed on the outer surface.
m,, 41 Cylindrical prism section 32 further provided with substantially parallel light rays from m in the second lateral lens t32.42
m, emits focused light toward 42 m. And the above 11
IIl side lens 31 by cylindrical prism parts 32m, 42m of 12 Confucian lenses 32.42.

The focused light ray from 41 is further refracted as a substantially parallel beam IIK to the horizontal axis Y, and is refracted to the incident surface 11 of the reflecting lens 33.43.
1m, 43aK incident and passes through the wall thickness to the outer reflective surface 33b
.

43b, the light 1 is reflected substantially parallel to the optical axis
, 22d K, and is configured to allow a large amount of light to be incident thereon.

More specifically, the first side lenses 31, 41 and the second
The side lens blades 42 are disposed on the side of the light source 5 substantially parallel to the optical axis X, and are q) a first side lens je31.

The inner surface (light source side) of 41 has a Fresnel cutter (K) 31a.

41m is centered around the horizontal axis Y! Also, the cylindrical prism part 31b provided on the outer surface has a rhythm formed,
41b and the cylindrical prism portions 32m and 42m provided on the inner surfaces of the #I2@ lenses 32 and 42 are optically designed to correspond to each other. 2nd lens proverb in history, 42 cylindrical prism parts 32m, 42m
and reflective surfaces 33b and 43 provided on the buds.
b are configured to correspond to each other. Incidentally, the reflection lens 43 has the incident surfaces 33m and 43m formed in a step-like manner, and each reflection surface 33b provided on the outer surface.

'43b is formed with stepped portions 33e and 43a, and the reflective lens 4-3 is a second side lens support.

42.

As mentioned above, since the light source 5 is turned on, the optical effect when the light source 5 is turned on is as shown in the example shown in the figure, and the light emitted forward from the light source 5 is transmitted through the inner lens ρ as shown by the solid line in the figure.
The light source 5 enters the Fresnel prism portion 22b on the inner surface of the central portion 6 facing K, is refracted by the Fresnel prism portion 22b into a ray substantially parallel to the optical axis Part 22 & Yoru outer lens 2
The light passes through the lens 1, is condensed, and is emitted in front of the lens 2.

Furthermore, the light emitted laterally from the light source 5, that is, the side light, is transmitted through the first lateral lens 31 on the right and the f-th lens on the left, as shown by the dotted line in the figure.
7 lenses cut 30 on each inner surface of the illumination lens
．． 416, and this Fresnel cut 31m, 41m
The light is refracted into a light ray that is approximately parallel to the horizontal axis Y, passes through the wall thickness, and is controlled as a focused light by the trical prism portions 31b and 41b on the respective outer surfaces, and the focused light ray is A cylindrical prism portion 32m provided on the inner surface of the 211th lens 32°42.

It was incident at 42m, and the 21111th direction lens was good.The next day, 42
The rays are refracted by the cylindrical prism parts 32m and 42m into substantially parallel rays to the horizontal axis Y, and then passed through the outer reflecting lens.

The light enters the 430 incident surfaces 33m and 43m, passes through the wall thickness, and enters each of the outer reflecting surfaces 33b, 43b.

Then, a large amount of reflected light with a high luminous flux density controlled to be reflected into rays substantially parallel to the optical axis X is directed toward the outer circumferential portions 7 and 8 of the inner lens and e22 by the respective reflecting surfaces 33b and 43b, and is directed to the inner surface of the inner lens e22. Parts 22c and 22d are each sized, and the fisheye on the outer surface is transmitted through the wall thickness! Rhythm section 22
The light passes through the outer lens 21, is condensed in front of the front lens 2, and is emitted, making it easier to obtain the desired light distribution and main turn.

As shown in FIG. 3, among the direct light emitted from the light source 5, in the vehicle lamp of the invention No. 9, the light emitted forward that enters the central portion 6 of the inner lens n is at an angle shown by the solid line in the figure. The amount of light incident within the range of αT is the same as in the conventional case. The light radiated laterally from the light source 5, that is, the side light, has a luminous flux in the range of angle α1 on the right side and the range of angle α1 on the left side shown by the dotted line in the figure.
The Fresnel cuts 31m and 41m provided on the inner surface of each of the first side lenses 31 and 41 with a diameter of 13°4 refract the emitted light toward the side from the beam @5 into a direction approximately parallel to the horizontal axis Y, ft, m. The outer surface of the cylinder prism portions 31b and 41b
The cylindrical prism portion 32a of the second side lenses 32, 42 further converts the focused light into a focused light.

＼ 42 & is focused into a ray substantially parallel to the horizontal axis Y, and the substantially parallel ray is controlled to be reflected into a ray substantially parallel to the optical axis X by the corresponding reflecting surfaces 33b and 43b of the reflecting lens A and 43, respectively, and the inner lens A large amount of light with high luminous flux density can be made to enter toward the outer peripheral portions 7.8 on both sides of n. Therefore, the emitted light from the light source 5 is at an angle α
The luminous flux in the range of 1+α1+αt can be effectively used, and a large amount of light with high luminous flux density is incident on the outer peripheral portions 7 and 8 far from the planar front lens 20 and the light source 5 using the optical means 3.4. The brightness of the outer peripheral portions 7 and 8 can be compensated, so that dark areas do not occur on the outer peripheral portions 7 and 8, and the brightness of the entire lens surface can be made uniform, significantly improving visibility. I can do it.

In the above embodiment, the optical means 3 and 4 are arranged on both sides of the light source 5. However, the present invention is not limited to this, and the optical means 3 and 4 may be provided as traps on the entire side of the light source 5. By effectively utilizing the side light from 5, a large amount of light beam can be incident on the external part.

As is clear from the above-described embodiments, the vehicular 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 on the front surface of the housing.
7's has a fisheye on the outside! An optical means is provided with a rhythm part, a 7-lens grism part is provided in the central part facing the light source inside the rhythm part, and a large amount of luminous flux is incident on the outer circumferential part around the rhythm part. A first side lens and a second side lens are disposed, and a reflective lens is disposed outside the first side lens, and the light emitted laterally from the light source is directed to the inner surface of the first side lens so as to be perpendicular to the optical axis. A Fresnel cut portion is provided to refract the light beam substantially parallel to the horizontal axis, and a cylindrical cylindrical portion is provided on the outer surface to converge the light beam, and the second
The side lens is provided with a cylindrical cylindrical part that refracts the focused light from the first side lens into a ray substantially parallel to the horizontal axis, and the reflective lens K11r refracts the light ray from the second side lens to the outer periphery. This feature is characterized by the provision of a reflective surface to reflect light rays substantially parallel to the optical axis towards the center of the light, which eliminates the problems of the conventional method and makes effective use of the luminous flux of the light source. A large amount of light with a high luminous flux density can be incident on the outer periphery of the lens, thereby making it possible to equalize the brightness over the entire surface of the lens, which has the effect of significantly improving visibility.

It should be noted that, as a matter of course, the present invention is not limited to the above-described embodiments.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional lamp, FIG. 2 is a sectional view of a main part of a vehicle lamp according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing the range of use of luminous flux of a light source. 1...Housing, 2...Front lens, 22a...
・Fish eyes! Rhythm section, 22b... Fresnel cut section, 3
．． 4... Optical means, 31.41... First side lens, 3"#41 m... Fresnel cut part, 31b
, 41b... Cylindrical prism section, 32,
42...211th lens, 32m, 42m...
Cylindrical cylindrical part, 33.43...Reflection lens, 33b-43b...Reflection surface, 5...Light source, 6.
...Central part, 7; 8...Outer part, X...Optical axis, Y...
...Horizontal axis.

Claims (1)

[Claims] This is a lamp in which a light source is placed in a lamp chamber defined by a housing and a lens placed on the front side of the housing. 7. An optical means that includes a Rennel grism section and allows a large amount of light to enter toward the outer circumference of the periphery is as follows:
A first side lens and a 21st lens are arranged on the side of the light source and approximately parallel to the optical axis.
A reflective lens is placed on the outside of the first side lens, and the light emitted from the light source to you is reflected on the inner surface of the #J first side lens into a ray approximately parallel to the horizontal axis perpendicular to the optical axis. A Fresnel cut part that refracts the light is provided, and a silicitric prism part that focuses the light is provided on the outer surface.
The @ side lens is provided with a clindrical prism part that refracts the focused light from the first side lens into a horizontal axis and approximately one line of rays, and furthermore, the light ray from the 211th side lens is directed to the outer periphery of the target. A vehicular lamp characterized in that a reflective surface is provided to reflect an optical axis and a beam of light toward the center.