Symbol reader using differentiating circuit for light beam focus

Details Symbol reader using differentiating circuit for light beam focus Symbol reader using differentiating circuit for light beam focus

1990-12-19

1993-01-05

Shepperd, John W.

Registers

Coded record sensors

Readout control

235455, 235467, 2502015, 2502017, 356123, G06K 7015, G06K 710, G01J 120

Patent

active

051773430

ABSTRACT:
A symbol reader for reading symbols on a symbol surface. An optical system including a laser, condensing lens and scanning mirror illuminate a symbol surface to be read with a laser beam, scanning across the symbol surface. A transducer measures the amount of light reflected from the symbol surface. A differentiating circuit develops a differential coefficient indicative of the change of light intensity as light scans the symbols being read. A control system adjusts the optical system illuminating the symbol surface so as to maximize the differential coefficient, thereby minimizing the diameter of the light beam to allow for adequate reading of the symbol surface at variable distances.

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