Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-11-15
1996-07-02
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214SW, 250221, 250205, H01J 4014
Patent
active
055324720
ABSTRACT:
A photoelectric switch includes a light emitting section emitting pulse light so that intensity of the emitted pulse light is sequentially increased. A light detecting section detects the pulse light emitted by the light emitting section. A light detection signal indicative of the received light is amplified and then integrated. A high-level light detection signal is delivered by the light detecting section when an integral value is equal to or above a threshold. A determination circuit delivers a first detection signal when a duration of the light detection signal is equal or above a predetermined values. The determination circuit further delivers a stable operation signal when a set time period is reached. The light detecting section is integrated into one-chip configuration.
REFERENCES:
patent: 5008532 (1991-04-01), Ono et al.
patent: 5030891 (1991-07-01), Ooka
patent: 5057683 (1991-10-01), Fukuyama
patent: 5126555 (1992-06-01), Hawryluk
patent: 5155350 (1992-10-01), Ottleben
patent: 5243182 (1993-09-01), Murata et al.
patent: 5424532 (1995-06-01), Occheto et al.
Nichols Steven L.
Sunx Kabushiki Kaisha
Westin Edward P.
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