Keying apparatus with thumb gap

Details Keying apparatus with thumb gap Keying apparatus with thumb gap

1995-08-24

1999-03-09

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250553, 345168, 341 22, G01V 904

Patent

active

058804625

ABSTRACT:
A photoelectric keyboard switch apparatus comprising a first structure to produce and detect laterally directed and longitudinally spaced first light beams at a first level in a simulated keyboard area, which is open; a second structure to produce and detect longitudinally directed, laterally spaced second light beams at or proximate to the first level, in the area, whereby the first and second light beams produce a grid-like pattern having cross-over nodes; a third structure to produce and detect third light beams at a second level or levels, whereby user's finger interruption of a third beam occurs in conjunction with finger interruption of the first and second beam at or near one or more nodes.

REFERENCES:
patent: 4384201 (1983-05-01), Carroll et al.
patent: 4998014 (1991-03-01), Hasegawa
patent: 5136156 (1992-08-01), Nounen et al.
patent: 5477223 (1995-12-01), Destremps

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