Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-02-09
1995-08-08
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25055906, 235437, 356239, G06K 710
Patent
active
054401429
ABSTRACT:
A system and method for testing bar code scanner window viability which determines whether the window is scratched or otherwise damaged enough to require replacement. The system includes a laser beam source. The laser beam passes through a window glass for scanning a bar code label. Light reflected from the bar code label passes through the window glass and is detected and converted into an electrical signal. Finally, a processor determines the bar code information from the electrical signal and determines whether the window glass is damaged enough that the bar code information cannot accurately be determined. The method determines the variance between the widths of the bars and spaces from a plurality of bar code scans and compares the variance to a predetermined threshold. The window glass is replaced when the threshold is exceeded.
REFERENCES:
patent: 3995166 (1976-11-01), Hobart et al.
patent: 4955693 (1990-09-01), Bobba
patent: 5134272 (1992-07-01), Tsuchiya et al.
Allen Stephone B.
AT&T Global Information Solutions Company
Martin Paul W.
LandOfFree
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