Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-09-26
1995-11-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235472, 359213, H01J 314
Patent
active
054649765
ABSTRACT:
A bar code reader for reading two-dimensional bar codes is disclosed herein. The reader includes first and second oscillating mirrors which oscillate to scan the light beam of the reader over the code. The first mirror is oscillated about a horizontal axis at a first velocity during the first half of its oscillating cycle, and at a second velocity during the second half of the oscillating cycle. The second mirror is oscillated about a vertical axis at a generally constant frequency. The reader varies the first and second velocities based upon the error rate monitored during decoding. By varying the first and second velocities, the slope of the scanning lines can be varied to enable reading two-dimensional bar codes which are oriented at slopes which differ from bar code to bar code.
REFERENCES:
patent: 4527055 (1985-07-01), Harkless et al.
patent: 4878721 (1989-11-01), Paulsen
patent: 5124539 (1992-06-01), Krichever et al.
Allen-Bradley Company, Industrial Medium and High-Speed Bar Code Scanners, Publication 2755-2.34, May, 1990, pp. 1-12.
Bechtel Richard D.
Scofield Robert E.
Allen-Bradley Company Inc.
Hamann H. F.
Horn John J.
Le Que T.
Morrow James G.
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