JPH024405Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a vehicle lamp that uses a light emitting diode as a light source, and particularly to a lamp that is mounted obliquely so that the lens is inclined with respect to the optical axis of the lamp. This has been improved so that light can be effectively emitted forward and upward to reduce loss, improve light distribution, and reduce the depth of the lamp, making it more compact.

[Conventional technology]

In recent years, advances in semiconductor technology have led to the development of high-brightness light-emitting diodes, which are now available at low prices, so they are being considered as light sources for vehicle lighting, such as brake lights, taillights, and high-mounted stop lamps. . The main reason for this is that, in addition to the fact that high-brightness products are now available at low prices, unlike ordinary light bulbs, they do not have a filament and have a semi-permanent lifespan. There are fewer restrictions on the lamp itself and its mounting position, and the lamp can be made thinner and easier to install. This is because it has many excellent features, such as generating significantly less heat than light bulbs and being able to be made smaller, and can be said to point to the direction of future lighting equipment.

Among such vehicle lamps, the lens is arranged obliquely along the inclination angle of the rear window glass. In that case, in a lamp in which the light emitting diodes are disposed in the same plane orthogonal to the lamp optical axis, the distance from each light emitting diode to the lens is different, which poses a problem in terms of uniform illumination. Another problem is that the size of the lamp protruding from the inner surface of the rear window glass increases, resulting in an increase in the size of the lamp.

[The problem that the idea aims to solve]

Therefore, as a way to solve this problem, a lighting device was proposed in which the lens is formed into a step shape and a light emitting diode is placed inside each step, as seen in Japanese Utility Model Application Publication No. 129630/1983. has been done.

However, such lamps are intended only to reduce the size of the lamp, and no consideration is given to the light emitting characteristics of the light emitting diode, resulting in problems in terms of light distribution.

In other words, a light emitting diode emits light in an elliptical shape with its long axis in the direction of the optical axis, with a large amount of light in the direction of the optical axis and a small amount of light in the direction perpendicular to the optical axis. It has the disadvantage that there is a lot of loss of emitted light and the light distribution characteristics in the upward direction are extremely poor.

Therefore, the present invention was devised in view of the above-mentioned conventional problems, and its purpose is to eliminate the loss of light in the upward direction and improve the light distribution characteristics of the lamp. The object of the present invention is to provide a vehicular lighting device that has the following features.

[Means to solve the problem]

In order to achieve the above object, the present invention has a front lens formed in a step-like shape to form a plurality of front lenses each consisting of a front emission part that is approximately perpendicular to the lamp optical axis and an upper emission part that is approximately parallel to the lamp optical axis. A step is provided, an opening is provided in the upper emission part, and a light emitting diode is arranged inside each step parallel to the optical axis of the lamp.

[Effect]

In the present invention, the upward light emitted from the light emitting diode passes through the opening provided in the upper emitting part of each step and is emitted to the outside without being absorbed.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of the vehicle lamp according to the present invention applied to a high-mount stop lamp, and FIG. 2 is an external perspective view. In these figures, 20 is a rear window of an automobile, and this rear window 20 is provided to be inclined rearward, and a high mount stop lamp 21 is disposed on its inner surface.

The high mount stop lamp 21 has an open front face facing the rear window 20, a lamp body 23 fixed to the inner surface of the rear window 20 via a gasket 22, and a lamp body 23 that closes the opening of the lamp body 23. a plurality of light emitting diodes 26 disposed in a light chamber 25 formed by the light body 23 and the lens 24;
It is generally composed of a bracket/wiring board 27 on which is mounted.

The lamp body 23 is made of a plastic material or a light alloy such as aluminum, and its back surface 23a
The opening surface 28 is formed to be substantially parallel to the rear window 20, and a stepped portion 29 for receiving the peripheral edge of the lens 31 is formed on the inner surface.

The lens 24 is made of translucent resin, glass, etc. colored in a predetermined color, for example, red, and has a step-like cross-sectional shape as shown in the figure, so that it is approximately aligned with the optical axis 30 of the lamp. A front emission part 31a that is perpendicular to each other and an upper emission part 3 that is parallel to the lamp optical axis 30.
1b. The lamp optical axis 30 is substantially horizontal and intersects the rear window 20 at an appropriate angle, for example, at an angle of 45 degrees. Front emission part 31a of each step 32
The distances from the rear window 20 are approximately the same, and a plurality of fisheye condensing lenses 33 are integrally protruded from the inner surface of the lens 24 in a dense manner in the longitudinal direction (direction perpendicular to the plane of the drawing). On the other hand, each step 3
An opening 36 extending approximately the entire length of the lens 31 in the width direction is provided in the upper emission portion 31b of the lens 31 .

The light emitting diodes 26 are arranged substantially parallel to the lamp optical axis 30 and inside each step 32, so that they are located behind the front emitting section 31a and below the upper emitting section 31b. For this reason,
Each of the light emitting diodes 26 is arranged in a stepped manner offset in the direction of the lamp optical axis 30. Further, each light emitting diode 26 and the corresponding fisheye condensing lens 3
The distance from 3 is almost the same.

In the high mount stop lamp 21 configured in this way, the light 37 emitted forward out of the light emitted from each light emitting diode 26 is focused by the fisheye condensing lens 33 and sent to the front emitting part 31a.
After passing through, the rear window 20 is irradiated. This light then passes through the rear window 20 and heads toward the rear of the vehicle. In this case, the distances from the rear window 20 to each light emitting diode 26 are approximately equal, and most of the light emitted from the light emitting diode 26 is
Since the light passes through the front emission part 31a that is substantially perpendicular to the optical axis 30 and illuminates the rear window 20, the entire rear window 20 is illuminated with substantially uniform brightness.

Further, among the light emitted from the light emitting diode 26, the light 38 directed upward is transmitted to the upper emitting section 31 of each step 32.
Since the rear window 20 is irradiated through the opening 36 provided at the rear window 20, there is no loss of light and the rear window 20 is illuminated more brightly. Therefore, it is advantageous in terms of effective use of light.

Furthermore, since the light emitting diodes 26 are arranged in a stepwise manner and the back surface 23a of the lamp body 23 is inclined so as to be almost parallel to the rear window 20,
The depth dimension of the high mount stop lamp 21 itself can be made equal in the height direction of the lamp, which has the advantage that the lamp itself can be miniaturized.

Although the present invention has been described with reference to the case where it is applied to a high-mounted stop light, it goes without saying that the present invention is not limited to this and can be applied to brake lights, tail lights, and the like.

[Effect of idea]

As mentioned above, the vehicle lamp according to the present invention is
In a lamp in which the lens is arranged at an angle with respect to the optical axis of the lamp, the lens is formed in a step-like shape to form a front emission part that is substantially perpendicular to the optical axis of the lamp and an upper emission part that is parallel to the optical axis of the lamp. Since a plurality of steps are provided and an opening is provided in the upper emitting part, there is no absorption of light by the upper emitting part, and the entire surface of the lens can be brightly illuminated, thereby improving the light distribution characteristics of the lamp. In addition, the depth dimension of the lamp is also reduced, making it more compact, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a high-mount stop lamp, and FIG. 2 is a perspective view of the appearance of the lamp. 20...Rear window, 21...High mount lamp, 23...Light body, 24...
Lens, 25...Light chamber, 26...Light emitting diode, 30...Lamp optical axis, 31a...Front emission part,
31b...Upper emission part, 32...Step, 36
...Opening.

Claims (1)

[Scope of utility model registration request] A lamp body, a lens arranged on the body so as to close an opening of the lamp body and inclined with respect to the optical axis of the lamp, and a large number of lenses arranged in a lamp chamber formed by the lens and the lamp body. A light emitting diode is provided, and the lens is formed in a step-like shape to include a plurality of steps including a front emitting portion substantially perpendicular to the optical axis of the lamp and an upper emitting portion substantially parallel to the optical axis of the lamp. The upper emission part is provided with an opening, and the light emitting diodes are arranged parallel to the optical axis of the lamp and shifted in the optical axis direction of the lamp so as to be located inside each step. Characteristic vehicle lighting equipment.