Symbol reader

Details Symbol reader Symbol reader

G - Physics

06

K

354/65

G06K 7/14 (2006.01) G06K 7/10 (2006.01) G06K 9/00 (2006.01)

Patent

CA 2031824

A symbol reader for reading symbols on a symbol surface. An optical system including a laser, condensing lens and a 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 differential 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 at variable distances.

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