Laser beam generation control system for optical bar code scanne

Details Laser beam generation control system for optical bar code scanne Laser beam generation control system for optical bar code scanne

1994-12-06

1998-03-03

Couso, Yon J.

Image analysis

Image sensing

382100, G06K 900

Patent

active

057244588

ABSTRACT:
A laser beam generation control system of an optical mark reader device including a laser generating element, a laser generation control unit, a laser scanner unit for scanning a mark, such as a bar code or the like, and a signal processor unit for photoconverting a reflected light to read thereof; wherein the laser beam generation control unit turns ON/OFF the laser generation element by a predetermined duty to carry out a generation of the laser intermittently. Further, when a reflected light from the mark is detected during an intermittent generation of the laser beam, the laser generation element is turned ON to generate a laser beam continuously; and when a reflected light from the mark is not detected for more than a predetermined first time period during a continuous generation of a laser beam, the system is switched from continuous generation to intermittent generation.

REFERENCES:
patent: 3925639 (1975-12-01), Hester
patent: 4032888 (1977-06-01), Broyles
patent: 4160156 (1979-07-01), Sherer
patent: 4392056 (1983-07-01), Weyandt
patent: 4639606 (1987-01-01), Boles
Broockman, et al., "Shutterless Laser Scanner Capable of Class 1 Operation", IBM Technical Disclosure Bulletin, p. 5586, vol. 26, Mar. 1984.
European Search Report, the Hague, search mailed Mar. 3, 1993.

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