| 摘要 |
Disclosed is a light guiding sheet that is provided on the backside of a keytop comprising a plurality of key buttons and guides light emitted from a light source for illuminating the plurality of key buttons from the backside of the keytop. The light guiding sheet comprises a flat plate-shaped light guiding part and a peripheral part that is provided integrally with the periphery of the light guiding part. The peripheral part has a larger thickness than the thickness of the light guiding part, and the surface of the peripheral part which faces the backside of the keytop is flat. The side surface of the peripheral part serves as an incident plane for light emitted from the light source. Upon the contact of the flat surface with the backside of the keytop, the peripheral part holds the size of a space between the backside of the keytop and the surface of the light guiding part at a given value.
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