Illumination type key sheet and push button switch
OwnerMasami Arai, Tohru Kimurainventors
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Abstract
The present invention provides a technique that can divide and illuminate display elements juxtaposed in one key top for each use function. Areas divided by the dividing portions of the attenuation means in the projection surface of the key top can be respectively illuminated by backlights from different LEDs, so each divided area can be individually controlled and illuminated. Therefore, it is possible to realize a key sheet in which display elements juxtaposed in one key top are divided for each use function and illuminated.
Claims7
An illumination type key sheet which includes a base sheet formed of a light guiding sheet and light-transparent key tops firmly fixed to an operation surface side of the base sheet and in which a display element showing an operation function of a key top can be illuminated by backlight,
- wherein the base sheet is a light guiding sheet which includes a light guiding means for transmitting light and an attenuation means for attenuating or reflecting light and in which the attenuation means divides the light guiding means into a plurality of illumination areas for transmitting light, and
- a plurality of display elements showing a plurality of operation functions included in one key top are illuminated from an illumination area corresponding to each display element.
A push button switch comprising:
- an illumination type key sheet which includes a base sheet formed of a light guiding sheet and light-transparent key top firmly fixed to an operation surface side of the base sheet and in which a display element showing an operation function of a key top can be illuminated by backlight;
- and
- a circuit board including a plurality of internal light sources,
- wherein the base sheet is a light guiding sheet which includes a light guiding means for transmitting light and an attenuation means for attenuating or reflecting light and in which the attenuation means divides the light guiding means into a plurality of illumination areas for transmitting light, and
- a plurality of display elements showing a plurality of operation functions included in one key top are illuminated from an illumination area corresponding to each display element.
Dependencies are inferred from the claim text.