Optical selector switch and display apparatus
First Claim
1. Angle repeater means adapted for use with angular position pick-off means producing first and second pulse trains upon rotation thereof through an integral number of complete revolutions in a first or in a second direction, said repeater means including:
- clock means,first and secon bistable means responsive to said clock means cooperatively forming pulse synchronizer means and respectively responsive to said first and second pulse trains, each said bistable means having respective Q and Q outputs,phase detector means responsive to said respective Q and Q outputs for generating a first control signal representative of the sense of said first or second directions and a second control signal representative of the number of pulses in said first or second pulse trains,counter means responsive to said first and second control signals, anddisplay means responsive to said clock means and to said counter means for displaying a true numerical measure of the total angular motion of said angular position pick-off means,wherein said phase detector means includes;
third bistable means having a data input responsive to the Q output of said first bistable means and a clocking input responsive to the Q output of said second bistable means, andfourth bistable means having a data input responsive to the Q output of said second bistable means and a clocking input responsive to the Q output of said first bistable means.
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Accused Products
Abstract
An optical pulse-forming switch includes a pair of spaced apart photodetectors and a rotatable shutter arranged to permit sequentially illuminating first one photodetector and then the other, depending on the sense of rotation, to produce out-of-phase pulse trains. The optical pulse-forming switch is interfaced with a pair of synchronized flip-flops and a phase detection counter control circuit which senses rotation extent and direction. The counter control circuit drives a counter that stores the number of passed angular increments and stores direction of rotation, the counter being interrogated and reset at regular time intervals. Thus, the input shaft rotation is converted into a digital quantity by maintaining a running summation of counter values. The operator reference indicator is accordingly brought up to date following each input conversion.
16 Citations
11 Claims
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1. Angle repeater means adapted for use with angular position pick-off means producing first and second pulse trains upon rotation thereof through an integral number of complete revolutions in a first or in a second direction, said repeater means including:
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clock means, first and secon bistable means responsive to said clock means cooperatively forming pulse synchronizer means and respectively responsive to said first and second pulse trains, each said bistable means having respective Q and Q outputs, phase detector means responsive to said respective Q and Q outputs for generating a first control signal representative of the sense of said first or second directions and a second control signal representative of the number of pulses in said first or second pulse trains, counter means responsive to said first and second control signals, and display means responsive to said clock means and to said counter means for displaying a true numerical measure of the total angular motion of said angular position pick-off means, wherein said phase detector means includes; third bistable means having a data input responsive to the Q output of said first bistable means and a clocking input responsive to the Q output of said second bistable means, and fourth bistable means having a data input responsive to the Q output of said second bistable means and a clocking input responsive to the Q output of said first bistable means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification