JPS5814402A - 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 vehicle lamp, and more particularly to a vehicle lamp in which the brightness of the lens surface is made uniform by 71 degrees and visibility is improved.

In recent years, this type of vehicle lighting equipment has been designed to reduce the depth of the lighting equipment and make it thinner, so the direct light emitted from the light source is directed directly to the front lens without using a rotating paraboloid shape that takes up space. A vehicle lamp that is controlled by forming a Fresnel prism has been proposed.

Conventionally, a vehicle lamp equipped with a front lens formed with a direct-light Fresnel prism has a light source C arranged in a lamp chamber defined by a front lens B and a front lens B, as illustrated in FIG. The front lens b faces the light source C in order to control the emitted light (direct light) from the light source C as a ray substantially parallel to the optical axis X. It consists of an inner lens f forming a so-called direct Fresnel prism with a refractive prism g in the center and reflective prisms h and h' on its outer circumference, and emits light emitted from a light source C (direct -yt, ), the light incident on the inner lens f is incident at an angle of ♂ as shown in the figure, and is converted into a beam approximately parallel to the optical axis X by a direct-input Fresnel prism, and is converted into a beam approximately parallel to the optical axis X by the fisheye prism of the outer lens d. It is configured to collect light to obtain a desired light distribution pattern.

However, in such a conventional wheel lamp, the front lens b is formed into a planar shape and is disposed in the housing a, so that the light source eK of the direct Fresnel prism formed in the inner lens f is particularly The radiation light (direct light) that enters the refractive prism section g provided at the facing center and the reflective prisms h and h' provided at the outer periphery is only within the range of angle α0 as shown in the figure. This incident angle ♂ is 1 because the inner lens f is planar.
It is impossible for the angle to exceed 80°. Therefore, since the light incident on the inner lens f is within the range of angle α0, the utilization rate of the luminous flux from the light source C is low, and therefore the entire lens surface is dark, especially the reflective prism h on the outer periphery far from the light source C.
, h' is within the range of angle βhβ, which is a very small value compared to the value of the angle α0. 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 luminous flux density decreases, so the central part of the inner lens f facing the light source C looks bright from the outside, but the outer peripheral part The presence of such dark areas causes unevenness in brightness and brightness on the lens surface, making it impossible to obtain a uniform brightness surface over the entire lens surface, making the lighting filling unsightly, or achieving sufficient display functions such as signal lights. However, there are drawbacks such as reduced visibility.

The present invention was developed in view of the above circumstances, and the present invention effectively utilizes the luminous flux from the light source, eliminates the dark area that occurs on the outer periphery of the lens far from the light source, uniformizes the brightness of the entire surface of the lens, and improves visibility. The purpose of the present invention is to provide a vehicle lamp with good performance.

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

Fig. 2 is a cross-sectional view of the main part of the Toya invention applied to an automobile taillight, in which 1 is a housing made of synthetic resin, and a lens 2 disposed on the front side of this housing 1 is shown. The light source 5 is connected to the holder 5 through the socket 51 in the light chamber 10.
It is attached and arranged at 2. The front lens 2 includes an outer lens 21 having a fisheye prism portion 21 formed on the inner surface, and an inner lens 22 on the inner side thereof, and the inner lens 22 has an optical axis X (standard of the lamp) facing the light source 5 on its inner surface. A Fresnel prism part 22m of a direct system that refracts the source radiated forward from the light source 5 into a ray substantially parallel to the optical axis X is formed in the central part 6 near the central part 6 (axis), and the light source 5 which is around the central part 6 On the outer surfaces of the outer circumferential parts 7 and 8 farthest from the periphery, there are 7 Lennel prism parts 22b and 22c iE shadow-forming parts for controlling the refraction of the reflected and focused light from the total reflection lens 4 of the optical means described later into substantially parallel rays along the optical axis X. It is.

Then, a lens 3 is disposed substantially parallel to the optical axis X toward the light source 5 corresponding to the outer circumferential parts 7 and 8 far from the light source 5 of the inner lens 22, and the light source 5 is directed toward you by the side lens 3. The emitted light is refracted in a direction substantially parallel to the horizontal axis Y of the light source 6 which is orthogonal to the optical axis Total reflection prism section 41c + 42c
It is constructed so that a large amount of reflected and focused light is incident on the outer peripheral portion 7.8 of the inner lens 22.

More specifically, the side lenses 3 (31, 32) and the total reflection lenses 4 (41, 42) are arranged corresponding to the outer peripheral parts 7, 8 on both sides of the inner lens 22 far from the light source 5, as shown in the illustrated example. has been done.

That is, the side lenses 3 (51, 32) have a right side lens 51 and a left side lens 32 fixed on both sides of the light source 5 substantially parallel to the optical axis X in the housing 1 by appropriate means. The left and right side lenses 31 and 32 have inner surfaces (on the light source side) that refract the light emitted laterally from the light source 5 into rays substantially parallel to the horizontal axis Y of the light source 5 orthogonal to the optical axis X. 7 renel force points 31m centering on the horizontal axis Y,
32a is formed.

Further, on the outer surface thereof, there is a 7-renel force fitting portion 51a on the inner surface.

The total reflection lenses 41 and 4
Serrated prism portions 31b and 32b are formed with angles designed for each prism segment so that light enters the entire area of the prism.

On the other hand, the total reflection lenses 41 and 42 correspond to the left and right side lenses 31 and 32 disposed on both sides of the light source 5, and correspond to the outer portions 7.8 on both sides of the inner lens 220 inside the housing 1. A total reflection lens 41 on the left side and a total reflection lens 42 on the right side are arranged, and each total reflection lens 4
1, 42 #i Total reflection prism section 41c on the outer surface.

42e is formed in a multi-stage shape. Further, on the inner surface thereof, there are incident surfaces 41a and 42m set to be substantially perpendicular to the incident light from each prism segment of the sawtooth prism portions 31b and 52b on the outer surface of the side lenses 31 and 52.
and output surfaces 41b and 42b set to be substantially perpendicular to the reflected light from the total reflection prism sections 41a and 42a.
and are formed into a prism at a substantially right angle.

Since the configuration is as described above, as for the optical system when the light source 5 is turned on, as shown in the illustrated example, out of the light emitted from the light source 5,
In the direction of the inner lens 22, that is, as shown by the line in the diagram, the Schrenel prism @ 22a K is incident on the inner surface of the central part 6 facing the light source 5 of the inner lens 22, and this lens 22a is incident on the Schrenel prism part 22m. The light is refracted substantially parallel to the optical axis X, passes through the thickness as it is, and is emitted toward the outer lens 21. Furthermore, the light emitted from the light source 5 to the side is transmitted to the left side lens S1 as shown by the dotted line in the figure.
The light is incident on the 7-lens force points 31m and 52m on the inner surfaces of the and right side lenses 32, and is refracted into a ray substantially parallel to the horizontal axis Y of the light ll1i5, transmitting through the wall thickness, and passing through the sawtooth of each outer surface. The substantially parallel light beams enter the sawtooth prism portions 31b and 32b K, respectively, and the substantially parallel rays enter the sawtooth prism portions 31b and 32b.
, 32b, the light is refracted and emitted toward the entire area of each total reflection lens 41 and 42. The outgoing light from each prism segment is reflected by the incident surface 4 of each total reflection lens 41, 42.
1JL, 41m/song, (42a, 42m...
...), and pass through the wall thickness to each total reflection prism section 41a, 41a...
, 42m...), each exit surface 4 undergoes a total internal reflection phenomenon.
1b, 41b..., (42b, 42b...
...), a large amount of reflected and focused light is emitted toward the outer peripheral parts 7 and 8 of the lens far from the light source 5 on both sides of the lens 220, and then enters the flat part of the inner surface of the lens 220 and passes through the wall thickness. Then, the optical axis and the proton beam INK are refracted by the outer surface of the 7-Renel prism portions 22b and 22c, and the light emitted from the central portion 6 is also formed on the inner surface of the outer lens 21, forming a round fisheye. The prism section 21 & refracts and emits the light so as to condense it in front of the lens, so that a desired light distribution pattern can be obtained.

Accordingly, in the vehicle lamp of the present invention, the forward emitted light incident on the inner lens 220 and the center 116 facing the light source 5 emitted from the light source 5 falls within the range 80 of the angle f/1 as shown in the figure.
The same amount of light as before is incident on the light beam. Furthermore, as shown in the figure, the side emitted light from the light source 5 has an angle α0s on the right side and an angle α03 on the left side. 4
2, a large amount of reflected and focused light with high luminous flux density can be made to enter the entire area of the outer circumferential portion 7.8 on both sides of the in-no-lens 220, and therefore the emitted light from the light source 5 is directed forward. In addition to the range of the angle α01 of the emitted light, the luminous flux of the side emitted light in the range of the negative degree α1+αlls can be effectively used, and the amount of light can be greatly increased. Especially the outer periphery of the lens far from the light source 7.・Since the side emitted light from the light source 5 can be incident on the side lenses 51 and 52 and the total reflection lenses 41 and 42, a large amount of light with high luminous flux density can be input into the outer peripheral part of the lens 8. It is possible to compensate for the brightness of 7.8. Therefore, the outer peripheral portions 7, 8
Unlike conventional lenses, there are no dark areas and uneven brightness, and the brightness across the entire lens is even! There are effects such as being able to obtain a vehicle light that satisfies visibility. ... In the above-mentioned embodiment, the side lenses 31 and 32 and the total reflection lenses 41 and 42 were arranged on both sides of the light source 50, and nine were described, but the present invention is not limited to this. Depending on the shape of the lens 2, it may be arranged on one side of the light source 5, or on the circumferential side such as the top, bottom, left, right, etc. Also, the 7 Lennel prism portion provided on the inner lens 22 may be formed in a lattice shape. In this case, the outer lens is composed of a cover lens. Also, it does not have to be of the dual-lens structure type.

As is clear from the above-described embodiments, the wheel 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 front lens, and the -surface lens receives light 1.
[A Fresnel prism part is formed in the central part facing K and the outer peripheral part around it, and a side lens is arranged approximately parallel to the optical axis on the side of the light source corresponding to the outer peripheral part, The lens has a Fresnel cut part on its inner surface that refracts the light radiated laterally from the light source into light substantially parallel to the horizontal axis of the light source, and its outer surface allows the light to enter the entire area of a total reflection lens disposed on the inner surface of the housing. The total reflection lens has a prism formed on the inner surface with an incident surface and an exit surface at substantially right angles, and a total reflection prism section is provided on the outer surface of the total reflection lens. Furthermore, the present invention is characterized in that it is configured to allow a large amount of reflected and focused light to enter, so that unlike conventional lenses, dark areas do not occur on the outer periphery of the lens, and the luminous flux from the light source can be effectively used. When used, a high amount of light with high luminous flux density can be incident on the outer periphery of the lens, making it possible to equalize the brightness over the entire surface of the lens and improve visibility. 0. You can get a wi light.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional diagram illustrating the range of luminous flux utilization of a conventional lamp;
FIG. 2 is an explanatory diagram showing an optical path diagram of an optical system and a luminous flux utilization range showing an embodiment of a vehicle lamp according to the present invention. 1...Housing, 2...Front lens, 22m, 2
2b. 22c... Fresnel prism section, 3 (31, 52).
・・Side lens, 31m, 32a-7 Lennel force point portion, 31b, 52b −・・Sawtooth prism portion, 4
(41,42)...Total reflection lens, 41m, 42
a--Incidence surface, 41b, 42b--Output surface, 41a
, 42e... Total reflection prism section, 5... Light source,
6... Central portion of the lens, 7, 8... Outer periphery of the lens, X... Optical axis, Y--Horizontal axis of the light source. Patent applicant Masami Akimoto, agent of Ichikoh Industries Co., Ltd., patent attorney]□

Claims (1)

[Claims] A light fixture in which a light source is arranged in a lamp chamber defined by a housing and a front lens, wherein the front lens has a Fresnel prism formed in a central part facing the light source and an outer peripheral part around the central part, and A side lens is disposed on the side of the light source corresponding to the part, and is arranged substantially parallel to 'Jt,@, and the side lens is arranged on the inner surface of the side lens so that the light emitted from the light source to the side is made to be substantially parallel to the horizontal axis of the light source. A Fresnel cut portion for refraction is formed, and a circular sawtooth prism portion is formed on the outer surface at an angle such that the light beam enters the entire area of a total reflection lens provided on the inner surface of the housing, and the total reflection lens is provided on the inner surface of the housing. A vehicular lamp characterized in that a prism is formed with an entrance surface and an exit surface at a substantially right angle, and a total reflection prism section is provided on the outer surface of the prism so that a large amount of reflected and focused light is incident toward the outer periphery.