Photoelectronic switch
First Claim
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1. A photoelectronic switch comprising:
- a pulse oscillator for outputting oscillation pulses at a predetermined frequency,a counter operatively connected to said pulse oscillator for counting the oscillation pulses,a light emitting element driven by said oscillation pulses and a photoreceiving element for receiving the light pulses issued from the light emitting element,a latch circuit operatively connected to said photoreceiving element and said pulse oscillator for latching a photo-reception signal from the photoreceiving element in synchronization with said oscillation pulses, anda counter control circuit means operatively connected to said counter and said latch for resetting said counter when the number of oscillation pulses counted by said counter during the operating state of said photoreceiving element as determined by said latch is less than a predetermined count value, and for presetting said counter when the number of oscillation pulses counted by said counter during the non-operating state of said photoreceiving element as determined by said latch is less than the predetermined count value.
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Abstract
A photoelectronic switch circuit of a pulse-modulated light system adapted to emit pulse light and conduct detecting operation by detecting only the photo-reception signal synchronized with the pulse light, and it comprises a counter control circuit for resetting or presetting the output signal from a counter if the number of pulse light successively received is less than a predetermined number to eliminate the effect, if any, of external disturbance light and facilitates to attain the integrated circuit by reducing the number of parts for the circuit constituting portion.
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Citations
7 Claims
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1. A photoelectronic switch comprising:
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a pulse oscillator for outputting oscillation pulses at a predetermined frequency, a counter operatively connected to said pulse oscillator for counting the oscillation pulses, a light emitting element driven by said oscillation pulses and a photoreceiving element for receiving the light pulses issued from the light emitting element, a latch circuit operatively connected to said photoreceiving element and said pulse oscillator for latching a photo-reception signal from the photoreceiving element in synchronization with said oscillation pulses, and a counter control circuit means operatively connected to said counter and said latch for resetting said counter when the number of oscillation pulses counted by said counter during the operating state of said photoreceiving element as determined by said latch is less than a predetermined count value, and for presetting said counter when the number of oscillation pulses counted by said counter during the non-operating state of said photoreceiving element as determined by said latch is less than the predetermined count value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification