Multi-plane optical membrane switch apparatus

Details Multi-plane optical membrane switch apparatus Multi-plane optical membrane switch apparatus

1982-03-16

1984-10-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340365P, G02B 514

Patent

active

044801831

ABSTRACT:
A multi-plane optical membrane switch for use for example in a keyboard matrix is formed by two flat, planar, clear, plastic members disposed in parallel, separated relationship and each having individual light conducting guides or channels thereon. The channels of the lower plane are disposed at right angles to the channels of the upper plane. The upper set of light guides includes integral, gently curving coupler taps disposed at the intersection of the upper and lower guides for coupling the light from the lower planar guide channels into the upper guide channels when the two channel intersections are pressed together by the key top effectively switching the light from the lower to the upper channels.

REFERENCES:
patent: 3982123 (1976-09-01), Goell et al.
patent: 4013342 (1977-03-01), Narodny
patent: 4360247 (1982-11-01), Beasley
patent: 4402568 (1983-09-01), Kulich et al.

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