Velocity sensing device using opto-electronic switches

Details Velocity sensing device using opto-electronic switches Velocity sensing device using opto-electronic switches

1981-04-08

1982-12-07

Witkowski, Stanley J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

84 11, 84 127, 84DIG7, 84423R, 84433, 250551, 307311, 340365P, G10C 312, G01D 534

Patent

active

043629342

ABSTRACT:
A musical synthesizer keyboard has a plurality of keys mounted so that each key may be displaced along and return along a locus of movement and where during travel in either direction along said locus a key causes a change of state in each of two corresponding optical detectors at spaced locations along said locus. Means are provided for signalling the states of the detectors to other equipment.

REFERENCES:
patent: 3617627 (1971-11-01), McLean
patent: 4301704 (1981-11-01), Nagai et al.

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