Laser beam bar code reading apparatus and method

Details Laser beam bar code reading apparatus and method Laser beam bar code reading apparatus and method

1990-01-03

1992-08-18

Trafton, David

Registers

Coded record sensors

Particular sensor structure

235436, 235462, G06K 710

Patent

active

051401428

ABSTRACT:
A bar code reading arrangement. A laser beam is scanned across a bar code which may be on a remote surface. Two detectors receive light reflected from the bar code, and convert it to an electrical signal. The detectors are laterally spaced on opposite sides of a line defined by the bi-section of the triangular area which is scanned by the laser beam. The electrical signal from the detector receiving only diffusely reflected light is used to identify the content of the bar code. The invention may be practiced in a hand-held unit with trigger means to initiate the bar code reading operation.

REFERENCES:
patent: 3770942 (1973-11-01), McMurtry
patent: 3985999 (1976-10-01), Yoneyama
patent: 4013893 (1977-03-01), Hertig
patent: 4057784 (1977-11-01), Tafoya
patent: 4460120 (1984-07-01), Shepard et al.
patent: 4882476 (1989-11-01), White
F. Denki Seizo, Optical Reader for Dot Bar Code, vol. 7, Patent Abstracts of Japan, Number 82, Apr. 6, 1983, p. 189 [1227].

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