JPH0112303Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Technical Field This invention relates to a light emitting display device used, for example, as a level meter.

b. Prior Art and Disadvantages Conventionally, this type of light emitting diode display device had the disadvantage that it lacked design interest because its light emitting surface was optically separated. Another drawback is that it is difficult to obtain sufficient luminous intensity as a result of attenuation of light due to internal reflection.

c. Purpose of the invention The purpose of this invention is to provide a light emitting diode display device in which the light emitting surface is optically continuous. Another object of this invention is to provide a light emitting diode display device with high luminous intensity.

d Features of the invention The light emitting diode display device according to the invention consists of a substrate, a housing, a rod lens, and a light diffusion sheet, and the substrate has a plurality of light emitting diode elements incorporated on a wiring pattern formed on the surface thereof. , the housing is made of synthetic resin and has a hole at the bottom of the U-shaped groove corresponding to the light emitting diode element on the substrate, and is mounted on the substrate, and the rod lens is attached to the housing. The light diffusing sheet is fitted into a U-shaped groove, and is characterized in that the light diffusion sheet is attached to the upper part of the housing.

e Description of Embodiment FIG. 1 is an explanatory diagram showing an embodiment of this invention.

In the figure, 10 is a substrate, on the surface of which a wiring pattern 12 is formed. A plurality of light emitting diode elements 11 are each fixed at a predetermined position using, for example, a conductive paste and wire bonded. 13 is a so-called external connection terminal, and 14 is a notch for attachment.

A housing 20 is made of, for example, white synthetic resin. The housing 20 is provided with a groove having a U-shaped cross section, and a hole 21 in the shape of a dome, for example, is bored at the bottom of the groove at a position corresponding to the light emitting diode element 11 of the substrate 10.

This housing 20 is mounted on top of the substrate 10. A rod lens 30 is made of, for example, transparent acrylic resin. This rod lens is fitted into the U-shaped groove of the housing 20 and fixed appropriately.

Reference numeral 40 denotes a light diffusion sheet, which is made of, for example, a translucent synthetic resin sheet. Since this light diffusion sheet 40 is attached to the upper part of the housing 20, its surface becomes a light emitting surface.

In the embodiment configured as described above, the light emitted by supplying an appropriate current to the light emitting diode element 11 is transmitted through the hole 2 of the housing 20.
1 or is reflected by the side wall of the hole 21 and enters the rod lens 30.

The light converged by the rod lens 30 is irradiated onto the light diffusion sheet 40, is scattered as appropriate, and is emitted to the outside.

Note that the gap between the rod lens and the diffusion sheet can be set arbitrarily; if the gap is made small, the width of the light appearing on the light emitting surface will be small, and if the gap is made large, the width of the light will be widened. I can do it.

The width of the light can also be narrowed by narrowing the opening of the U-shaped groove.

Furthermore, in the above-described embodiments, a device that emits light in a straight line has been described, but the invention is not limited to this, and may also be one that emits light in a curved manner. In this case, the light emitting diode elements may be arranged in a curved line, and a housing, rod lens, etc., shaped to correspond to this curve may be used. Furthermore, a lead frame may be used as the substrate 10.

Further, in the embodiment, a device that emits light in one row has been described, but if a similar configuration is formed in two rows on the same substrate, a device that emits light in two rows can also be obtained.

f Effect In this invention, the light emitted from the light emitting diode element is extracted through the rod lens and the light diffusion sheet, so the light appearing on the light emitting surface is optically continuous.

Therefore, the light emitting diode device according to this invention exhibits a design effect different from the conventional one and is very interesting.

Additionally, since the light is converged by the rod lens, the luminous intensity of the device increases by 5 to 20 times compared to a device without a lens.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of this invention. 10... Board, 20... Housing, 30...
Rod lens, 40...Light diffusion sheet.

Claims (1)

[Scope of utility model registration request] It consists of a substrate, a housing, a rod lens, and a light diffusion sheet, and the substrate has a plurality of light emitting elements installed in a line shape at predetermined intervals on the surface of the substrate, and a substantially U-shaped groove is formed in the housing. A hole is formed at the bottom of the groove corresponding to the light emitting element on the substrate, and the rod lens is mounted on the substrate, and the rod lens has a circular cross section and is fitted into the groove of the housing. It is
A line type light emitting display device, wherein the light diffusion sheet has a flat back surface and is attached to an upper part of the housing.