Illuminating device, and input device having the former

Abstract

To provide a thin illumination device capable of efficiently utilizing light emitted from a light source, and an input device equipped with the illumination device. [Means for Solution] A recess portion 2a is formed in a substrate 2 to accommodate a light emitting element 6 so as to be sealed with a sealant 9. A light guide layer 4 formed of a thin transparent resin film is fixed onto the substrate 2 via an adhesive layer 3 to realize an illuminating device 1A with a thin structure. The light emitted from the light emitting element 6 is irradiated into the light guide layer 4 via the sealant 9 and the adhesive layer 3. The light fully reflecting on the boundary surfaces between the light guide layer 4 and the adhesive layer 3, and between the light guide layer 4 and the air layer 5 passes inside the light guide layer 4. Then the light which has not fully reflected leaks outside from the surface of the transparent resin film which forms the light guide layer 4. This makes it possible to illuminate the surface of the illumination device 1A entirely with brightness.

Description

technical field [0001] The present invention relates to an illuminating device for illuminating operation parts and the like of various electronic devices, and particularly relates to a thin illuminating device capable of effectively utilizing light emitted from a light source, and an input device having the illuminating device. Background technique [0002] In various electronic devices such as audio equipment or portable electronic equipment, a light guide member is generally provided to guide light emitted from a light source such as an LED to the operation surface, and the operation buttons or engraved on the operation surface are guided by the above-mentioned light. Illuminate the fixed character or number display on the operation surface. [0003] Conventionally, this type of lighting device has a structure in which a lighting member such as an acrylic plate is attached to the back side of an operation surface of an electronic device, and light from a light source is g...

AI Technical Summary

Problems solved by technology

[0007] In addition, there is a problem in the conventional lighting device that it is bright near the light source, but the ratio of getting darker as it moves away from the light source is large, and the illuminance difference is large.

[0008] In addition, there is a problem in the conventional illuminating device that due to scattering of stray light, relatively bright parts (spots) are formed in an island shape on the surface of the light guide layer, and the surface of the surface of the light guide layer is not uniformly illuminated.

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