Method for calibration of an optical output power of a laser dio

Details Method for calibration of an optical output power of a laser dio Method for calibration of an optical output power of a laser dio

1996-05-06

1997-10-14

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235454, 235462, G06K 710

Patent

active

056775237

ABSTRACT:
A system for bar code reading and scanning is provided having automatic gain control for accurate reading of bar codes over a range of distance. An amplifier within the system provides a plurality of selectable amplification gain levels for increasing the size of the signal received by a digitizing element. A processor is programmed to select the gain level. The system has a light source, preferably a laser diode, and a laser diode circuit, which provides accurate setting by the processor of the laser optical power output. The laser diode is calibrated according to each selected gain level of the amplifier such that the system can scan within a desired range of distances from the system to a bar code. The system successively scans a bar code, with each scan being at a different amplification level. In the alternative, a signal size detector provides a signal representative of the size of the signal to the digitizer. Utilizing this detector, the system successively scans a bar code and switches the amplification level responsive to signal size.

REFERENCES:
patent: 4315245 (1982-02-01), Nakahara et al.
patent: 4481667 (1984-11-01), Price et al.
patent: 4528444 (1985-07-01), Hara et al.
patent: 4677287 (1987-06-01), Ejima
patent: 4816661 (1989-03-01), Krichever et al.
patent: 4820911 (1989-04-01), Arackellian et al.
patent: 4831275 (1989-05-01), Drucker
patent: 4894817 (1990-01-01), Tanaka et al.
patent: 4933538 (1990-06-01), Heiman et al.
patent: 5148008 (1992-09-01), Takenaka
patent: 5149948 (1992-09-01), Chisholm
patent: 5179269 (1993-01-01), Horie et al.
patent: 5200597 (1993-04-01), Eastman et al.
patent: 5210398 (1993-05-01), Metlitsky
patent: 5260554 (1993-11-01), Grodevant
patent: 5267253 (1993-11-01), Nakatani
patent: 5268914 (1993-12-01), Yamamuro et al.
patent: 5280162 (1994-01-01), Marwin
patent: 5308962 (1994-05-01), Heavens et al.
patent: 5363387 (1994-11-01), Sinofsky
patent: 5373581 (1994-12-01), Uchiyama et al.
patent: 5382782 (1995-01-01), Hasegawa et al.
patent: 5406062 (1995-04-01), Hasegawa et al.
patent: 5426288 (1995-06-01), Obata et al.
patent: 5438187 (1995-08-01), Reddersen et al.
patent: 5504315 (1996-04-01), Hardesty et al.

Affiliated with

Also associated with

Rating

Method for calibration of an optical output power of a laser dio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for calibration of an optical output power of a laser dio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for calibration of an optical output power of a laser dio will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1557098