Photoelectrical switching circuit with frequency divider circuit

Details Photoelectrical switching circuit with frequency divider circuit Photoelectrical switching circuit with frequency divider circuit

1991-05-08

1992-03-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250221, 340556, H01J 4014

Patent

active

050991132

ABSTRACT:
A photoelectrical switching circuit, which produces a pulse-modulated light for detecting presence of an object by light interruption or reflection, comprises a frequency divider circuit and a signal output circuit and may comprise a control circuit. The frequency divider circuit includes a counter formed by flip-flops and an operation stop circuit. The counter generates light emission pulse signals with variable period and read pulse signals to pick up light sensing signals and outputting the state of the final stage flip-flop as an operation signal. The operation stop circuit stops the operation of the final stage flip-flop after the operation signal is input. The signal output circuit, which provides output signals after the operation signal is input, includes a shift register for shifting the light sensing signals in step with clock pulses, a set output AND circuit, and a reset output AND circuit. The output AND circuit provides a logical product of a set output of the final stage and a set output of the m-th stage of the shift register to direct set terminals of the m+1-th and subsequent stages of the shift register, the reset output AND circuit performs the same operation with the reset outputs and the reset terminals of the shift register, and then the signal output circuit outputs output signals of the final stage of the shift register. The control circuit makes the period of pulse signals of the frequency divider circuit fixed for a predetermined length of time.

REFERENCES:
patent: 4434363 (1984-02-01), Yorifuji et al.
patent: 5003169 (1991-03-01), Sakaguchi et al.
patent: 5026978 (1991-06-01), Misumi et al.

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