Lighting device and inputting device using the same

Abstract

The invention provides a lighting device and an inputting device, thereby adjusting the quantity of light emitted from a light source, guided into a light guide layer and provided to a plurality of lighting indication parts according to each lighting indication part. The light source (8) is opposite to the light guide layer (3) to form the lighting device (30). A plurality of diffuse reflection parts (35A,35B) are formed on the surface of the light guide layer (3) and concave reflected rays (37A,37B) are formed on the diffuse reflection parts (35A,35B). The reflected rays (37A,37B) are different in the diffuse reflection parts (35A,35B) relative to the cross angles of optical paths (LA,LB) extending from the light source (8). The result shows that: the quantity of the light reflected by the diffuse reflection parts (35A,35B) and provided to the lighting indication part thereon and the quantity of the light through the diffuse reflection parts (35A,35B) are adjusted.

Description

technical field [0001] The present invention relates to an illumination device for supplying illumination light to an illumination instruction section provided on an operation section, and an input device using the illumination device. Background technique [0002] A keyboard device for a personal computer, a portable device or other electronic devices, a remote control device, an operating unit of a vehicle, etc. are provided with a plurality of input devices for performing pressing operations, etc., and an illuminating device for supplying illumination light to the input devices. [0003] Patent Document 1 discloses a light guide for illuminating keys of a keypad of a portable device. [0004] The light guide has: a film on the back of a keypad having a plurality of keys; a light emitting diode optically coupled to the film. A circular area for supplying light to each key is provided on the film, and a microstructured shape concavely cut into the film is formed in the cir...

AI Technical Summary

Problems solved by technology

If, as described in Patent Document 1, all the microstructured shapes are aligned in the same direction in all the circular regions, the luminance of the region with a large degree of repetition becomes too high, and the overall luminance unevenness tends to increase.

[0016] In the keyboard described in Patent Document 2, since the diffusion part is formed of a printed pattern, the ability to diffusely reflect the light propagating inside the light guide plate is low, and the amount of light supplied to the key top tends to decrease.

[0017] In addition, in Patent Document 2, since a plurality of light emitting diodes are opposed to the light guide plate, the area where the light emitted from the plurality of light emitting diodes overlaps has a larger amount of light than other areas, and thus unevenness is likely to occur. Illuminated

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