Bar code symbol scanner utilizing monitor photodiode of laser di

Details Bar code symbol scanner utilizing monitor photodiode of laser di Bar code symbol scanner utilizing monitor photodiode of laser di

1992-05-11

1993-02-16

LaRoche, Eugene R.

Registers

Coded record sensors

Particular sensor structure

235454, 235455, 235472, G06K 710

Patent

active

051873532

ABSTRACT:
An arrangement for reading bar code symbols including a laser diode unit having a forwardly-directed laser beam emitted along an optical path toward a symbol for reflection therefrom to generate reflected light, and a rearwardly-directed laser beam, and a monitor photodiode in optical communication with the rearwardly-directed laser beam for producing a signal indicative of the output power of the laser diode. The arrangement also includes a collector exterior to the laser diode unit for collecting at least a portion of the reflected light from the symbol, and for directing the collected portion to the monitor photodiode to generate an information signal descriptive of the symbol.

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