Optical information reading apparatus having means for judging l

Details Optical information reading apparatus having means for judging l Optical information reading apparatus having means for judging l

1993-09-07

1996-09-03

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

055525903

ABSTRACT:
An optical information reading apparatus comprises: a semiconductor laser (30); an optical scanning mechanism (50) for scanning bar code (90) using a laser beam emitted from the semiconductor laser (30); a photodetector (70) receiving a returning laser beam reflected at the bar code (90); information reading device (130, 140) for reading out information from the bar code on the basis of the returning laser beam received by the photodetector (70); sweep angle regulating mechanism (150, 180) for restricting a sweep angle of the laser beam used in a scanning operation of the optical scanning device (50) within a predetermined angle so as to scan only one bar code; an operational current detecting circuit (120) for detecting an operational current value of the semiconductor laser (30); and a deterioration judging device for making a judgement as to whether the semiconductor laser (30) is deteriorated or not on the basis of the operational current detected by the operational current value detecting circuit (120).

REFERENCES:
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patent: 4461974 (1984-07-01), Chiu
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patent: 5023515 (1991-06-01), Olon
patent: 5117098 (1992-05-01), Swartz
patent: 5199037 (1993-03-01), Aronowitz
patent: 5334826 (1994-08-01), Sato
"Stabilization of CW Injection Lasers", RCA Technical Notes, Apr. 9, 1975, pp. 1-3, James P. Wittke, David R. Patterson, Ivan Ladany, Authors.

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