Photoelectric switch monitoring the duration of pulsed light to prevent false signals due to ambient conditions
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Nov 15, 1994
filing date -
Nov 15, 1994
priority date (Note) -
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status (Latency Note)
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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.
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