Circuit for reflective mode optical reader

Details Circuit for reflective mode optical reader Circuit for reflective mode optical reader

1980-06-02

1982-04-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

043237746

ABSTRACT:
A detection circuit is disclosed for use in reflective mode optical mark readers employing LED's as light sources. The subject circuit includes a bias network which sets a contrast threshold for detection and which compensates for temperature variations. The subject detection circuit is ratio dependent rather than magnitude dependent thereby obviating problems which can arise from light sources of different intensities.

REFERENCES:
patent: 3706874 (1972-12-01), Lockard
patent: 3774015 (1973-11-01), Lockard

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