Keyboard

G - Physics – 06 – C

Patent

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345/56, 235/96

G06C 7/02 (2006.01) H03K 17/968 (2006.01)

Patent

CA 2033102

A novel keyboard is mounted in association with a circuit board with a light source which is mounted on the circuit board for emitting light. At least one depressible key is mounted for movement between a rest position and a depressed position, the depressible key having a body part which is formed of a light diffusing and transmitting material, the body part receiving light directly from the light source. A key cap is mounted on the body part, the body part moving concurrently with the key cap when the depressible key is depressed. A photoelectric member is mounted on the circuit board at a distance from the light source, the photoelectric member producing a change in electrical signal depending on the amount of light reaching the photoelectric member, at least a portion of the light reaching the photoelectric member being diffused through the body part when the depressible key is in the rest position. A light barrier is positioned between the light source and the photoelectric member when the depressible key is in the depressed position, the barrier shielding the photoelectric member from the light which is directly emitted from the light source and from the light which is diffused through the body part when the depressible key is in the depressed position.

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