Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-03-23
1988-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, G01V 904
Patent
active
047483237
ABSTRACT:
A joystick device disclosed has a plurality of light emitter-detector devices disposed around a control shaft in a casing supporting the shaft. A first blocking member on the control shaft selectively blocks out the light to one or two detectors which produces a change in electrical state at an output terminal of a signal processing circuit connected to each detector without the use of any physical contact or the use of mechanically operated electric switches. A second blocking member on an axially movable inner shaft actuated by a button interrupts the light from another light emitter-light detector device having a similar signal processing circuit. The output circuit connects to a plug-type connecting member that connects to a load device such as a joystick-operable computer or video game.
REFERENCES:
patent: 3811047 (1974-05-01), Shragal
patent: 3814199 (1974-06-01), Jones
patent: 4445541 (1984-05-01), Schmiel
patent: 4489303 (1984-12-01), Martin
patent: 4533827 (1985-08-01), Fincher
patent: 4538035 (1985-08-01), Pool
patent: 4607159 (1986-08-01), Goodson et al.
patent: 4614847 (1986-09-01), Sasao
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