Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-04-15
1980-03-18
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 250231SE, H03K 1300
Patent
active
041941845
ABSTRACT:
A digital rotary shaft position encoder includes a disk having a plurality of digitally encoded apertured tracks. The successive binary characters read from the tracks each have at least one 1 and comprise a repeating code having a different order of characters when read in one direction than when read in the other. The code is sensed to determine the direction of rotation of the shaft. The at least one 1 in each character is sensed to produce a clock pulse and these are counted to provide position information. The count is incremented or decremented in accordance with the direction information.
REFERENCES:
patent: 3634853 (1972-01-01), Hedges
patent: 3656154 (1972-04-01), Ross et al.
patent: 3702471 (1972-11-01), Kennedy et al.
patent: 3738504 (1973-06-01), Vail et al.
patent: 3967271 (1976-06-01), Day
patent: 4047007 (1977-09-01), Dlugos et al.
Hartmann John C.
Maxemchuk Nicholas F.
Cohen Samuel
RCA Corporation
Sloyan Thomas J.
Squire William
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