Photoelectric sensor having time changing means

Details Photoelectric sensor having time changing means Photoelectric sensor having time changing means

2005-02-22

2005-02-22

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S578100

Reexamination Certificate

active

06858832

ABSTRACT:
Detection of interfering light is performed based on an interfering light detection timing signal Si set immediately before a blockage detection timing signal Sr. If interfering light is detected consecutively with respect to the same optical axis according to interfering light detection timing, the length of blank period tb is reduced to shift the positions of pulses of the blockage detection timing signal, thereby avoiding overlap between these pulses and pulses of interfering light on the time axis. In this manner, mutual interference between multiple-axis photoelectric sensors can be prevented without providing sync line wiring between the photoelectric sensors.

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