JPH048562Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vehicle lamp using an LED as a light source.

[Prior art]

Vehicle lighting usually uses incandescent bulbs as a light source, but
Some use a large number of LEDs as a light source. For example, as shown in Fig. 1 A and B, this type of vehicle lighting equipment has a large number of LEDs serving as light sources arranged at predetermined locations on a printed circuit board b, and a diffusion cut c such as a fisheye cut on the front side. Lenses d formed to correspond to the LEDs a are attached to the printed circuit board b via gaskets e. In this case, the light ray that entered the lens d from the LEDa is
The light is diffused by the diffusion cut c and effectively radiated to the outside.

[Problem that the invention attempts to solve]

However, in the configuration of the conventional example described above, the light rays emitted from each LEDa are emitted in all directions and do not necessarily enter the lens d efficiently and evenly, causing brightness and darkness on the surface of the lens d, and There is a problem that the light-emitting surface does not shine uniformly.

[Means for solving problems]

As a specific means for solving the above-mentioned problems, the present invention includes a printed circuit board on which a large number of LEDs serving as light sources are arranged, and a lens attached to this printed circuit board and having diffusion cuts corresponding to each of the LEDs formed on the surface side. Each of the LEDs is positioned on a vertical axis passing through the center of each of the diffusion cuts, and a circular emitted light is provided at the center of each diffusion cut, corresponding to each of the LEDs on the inner surface of the lens. A vehicle lamp using an LED as a light source, characterized by having a condensing cut consisting of a convex surface that condenses light, and a curved surface with a shark-tooth cross section that emits light without a border around the circular emitted light. The convex surface and the shark-tooth curved surface increase the light utilization efficiency from the LED and make the brightness of the lens uniform.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to the illustrated embodiment. In Fig. 2, Te1 is an LED serving as a light source.
2 is a printed circuit board on which a large number of conductors 3 are arranged.
It is possible to light up LED2 via the.
Reference numeral 4 denotes a lens, and a diffusion cut 4a such as a fisheye cut is provided on the front surface side so as to correspond to each of the LEDs 2, and a condensing cut 4b is provided on the inside surface side so as to correspond to each LED 2. ing. The condensing cut 4b has a shape formed by rotating three continuous curved surfaces A, B, and C around a vertical axis V, and the LED 2 faces the concave portion 4c, and the vertical axis V has the center of the LED 2. At the same time, it also passes through the center of the curved surface of the diffusion cut 4a.

The light collecting cut 4b is formed of continuous curved surfaces A, B, and C as described above, and as is clear from the figure, the curved surfaces A and B form a shark-tooth shape in cross section, and the curved surface C
forms a convex surface toward the LED side. Therefore,
The curved surface A forming the shark-tooth shape serves as a reflection surface toward the diffusion cut 4a, and the curved surface B serves as an incident surface for the curved surface A. The lens 4 thus formed is attached to the printed circuit board 1 via a lens gasket 5.

Since the vehicle lamp according to this invention is constructed as described above, the light beam from the LED 2 is incident on the condensing cut 4b of the lens, is refracted or totally reflected, and reaches the entire surface side. The light is diffused by the diffusion cut 4a and radiated to the outside.

In this case, in each condensing cut 4b, out of the light emitted from each corresponding LED 2, the light emitted approximately upward is emitted in a circular shape from approximately the center of the corresponding diffuser cut 4a due to the curved surface C. The light that exits obliquely upward and to the side is directed to the curved surface A through the curved surface B, is totally reflected by the curved surface A toward the diffusion cut 4a, and is emitted seamlessly filling the periphery of the circular emitted light. . In other words, on the surface of each diffusion cut 4a, around the circular radiant light emitted through the curved surface C, the radiant light that has been totally reflected on the curved surface A is uniformly radiated adjacent to the curved surface A without any boundaries. . Therefore, the brightness of the light rays emitted from each diffusion cut 4a surface becomes uniform, and since these diffusion cuts 4a continuously form the lens 4,
As a result, there is no brightness or darkness on the surface of the lens 4, and the light emitting surface of the lamp shines uniformly. Furthermore, since the light beams from each LED 2 are efficiently focused by the condensing cut 4b, the brightness of the lens 4 is also improved.

[Effect of idea]

As explained above, the vehicle lamp according to the present invention includes a printed circuit board on which a large number of LEDs are arranged, and a lens provided with a diffusion cut corresponding to each of the LEDs. a convex surface located on a vertical axis passing through the center of the cut, corresponding to each LED on the inner surface of the lens, condensing circular emitted light at the center of each diffuser cut;
By creating a condensing cut consisting of a curved surface with a shark-tooth cross section that emits radiant light seamlessly around the circular radiant light, it is possible to significantly improve the light utilization efficiency of the LED, and also to Each diffusion cut in the state shines uniformly, producing an excellent effect of uniformly irradiating the entire lens.

[Brief explanation of drawings]

FIG. 1 shows a conventional example, A is an exploded perspective view of the main part of the lamp, B is a sectional view of a part thereof, and FIG. 2 is a sectional view of the main part showing an embodiment of the present invention. 1... Print base, 2... LED, 3... Conductor, 4... Lens, 4a... Diffusion cut, 4b...
...Condensing cut, 5...Lens gasket, A, B
...Curved surface forming a shark-tooth shape in cross section, C...Convex surface, V
...Vertical axis.

Claims (1)

[Scope of utility model registration request] It consists of a printed circuit board with a large number of LEDs arranged as a light source, and a lens attached to this printed circuit board with a diffusion cut corresponding to each of the LEDs formed on its surface side. A convex surface is positioned on the vertical axis passing through the lens, and a convex surface is provided on the inner surface of the lens corresponding to each of the LEDs to condense a circular emitted light at the center of each diffusion cut. A vehicle lamp that uses an LED as a light source, and is characterized by having a condensing cut made of a curved surface with a shark-tooth cross section that emits radiation light without boundaries.