Proximity and ambient light monitor

Details Proximity and ambient light monitor Proximity and ambient light monitor

1996-10-17

1997-11-04

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250221, H01J 4014

Patent

active

056842945

ABSTRACT:
A proximity detector and ambient light monitor (PALM) is provided, comprising a light source for generating an optical composite signal, a light detector for providing a detected signal, a circuit for separating the ac component from the detected signal, and a switch for providing a control signal when the ac component is outside a preset range. The PALM further comprises an ambient light detector which also receives the detected signal and provides an ambient light level signal. The ambient light detection circuit rejects the signals that relate to the proximity monitoring and provides sufficient gain to overcome daylight filtering lens currently provided on the light detectors. The ambient light monitoring circuit provides either a continuous varying voltage proportional to the ambient light, or a simple binary signal indicating that the light is above a threshold.

REFERENCES:
patent: 4735357 (1988-04-01), Gregory et al.
patent: 4977351 (1990-12-01), Bavaro et al.
patent: 5010566 (1991-04-01), Seo
patent: 5224151 (1993-06-01), Bowen et al.
patent: 5398680 (1995-03-01), Polson et al.

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