Photodetecting circuit

Details Photodetecting circuit Photodetecting circuit

Filed on

1987-12-23

Date issued

1989-07-25

Examiner

Nelms, David C.

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Photocell controlled circuit

Other Related Categories

250221, H01J 4014, G01V 904

Type

Patent

Status

active

Patent number

048516899

Description

ABSTRACT:
A photodetecting circuit for detecting radiation emitted from a light emitting element in the presence of ambient radiation is disclosed. The circuit includes a first and a second synchronizing on/off input signal having a predetermined period, each signal being complementary to the other. When the first synchronizing signal is "on", the second synchronizing signal is "off" and the circuit can detect the amount of ambient radiation. When the first synchronizing signal is "off", the second synchronizing signal is turned "on" and the light emitting element is energized and the circuit detects the amount of radiation emitted therefrom. The circuit prevents erroneous readings of radiation emitted from the light emitting element when the amount of detected ambient radiation is high.

REFERENCES:
patent: 4061925 (1977-12-01), van der Gaag et al.
patent: 4417148 (1983-11-01), Otake
patent: 4713534 (1987-12-01), Masters et al.

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