Detecting circuit for a photocell pattern sensing assembly

Details Detecting circuit for a photocell pattern sensing assembly Detecting circuit for a photocell pattern sensing assembly

1977-12-22

1979-01-30

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340190, 340347P, G01D 534

Patent

active

041374517

ABSTRACT:
Encoding photocells are positioned in a circuit array for sensing lighted and unlighted variations produced by changes in an optical code pattern. Corresponding signal output changes of the encloding photocells are detected by being sequentially connected to a sensing network including a reference photocell circuit array. The encoding photocell output changes are sensed at a voltage comparator having inputs connected to the sensing network and a fixed voltage reference to produce a binary signal output. A comparator inhibiting circuit deactivates the comparator in response to a malfunction condition to protect against erroneous operation.

REFERENCES:
patent: 3441923 (1969-04-01), King
patent: 3846789 (1974-11-01), Germer et al.
patent: 4037219 (1977-04-01), Lewis

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