Lighted electronic keyboard

Details Lighted electronic keyboard Lighted electronic keyboard

1992-09-30

1993-11-30

Peng, John K.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 31, 250229, 25022722, 200314, H01H 900

Patent

active

052669491

ABSTRACT:
A keyboard mounted in connection with a circuit board (2) includes a light source (3). A key (1) of the keyboard comprises a key cap (4) and a body part (5) located between the key cap (4) and the circuit board (2). The body part (5) diffusively transmits light. The light source (3) is arranged to conduct light into the body part (5) and to illuminate the key (1). A photoelectric member (6) is mounted on the circuit board (2) under the key (1) and at a distance from the light source (3). There is further arranged a light barrier (7) in connection with the circuit board (2) or with which key (1), the barrier is arranged to shield the photoelectric member (6) from the light of the light source (3) coming from the body part (5) when the key is depressed. The decrease in light provides an electric change (1) in the photoelectric member (6) indicating a depression of the key.

REFERENCES:
patent: 4049964 (1977-09-01), Wuchinich et al.
patent: 4303856 (1981-12-01), Serras-Paulet
patent: 4315147 (1982-02-01), Harmer
patent: 4931794 (1990-06-01), Haag et al.

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