Registers – Coded record sensors – Particular sensor structure
Patent
1986-09-30
1988-12-20
Pellinen, A. D.
Registers
Coded record sensors
Particular sensor structure
235454, 235462, G06K 714
Patent
active
047926660
ABSTRACT:
A method and apparatus for obtaining a more uniform output signal strength among various scan lines of a multiple scan line laser bar code reader involves switching of the gain level in the return signal amplifier of the bar code reader apparatus, in accordance with the position of the laser beam in the scanning sequence and in accordance with known information relating to the relative response that can be expected from each different scan line. This enables a better uniformity in signals from the reading of bar codes, regardless of which scan line was used to read the code, by compensating for inevitable variations in return signal strength on different scan lines, particularly in a shallow-profile slot scanner.
REFERENCES:
patent: 3891829 (1975-06-01), Dobea
patent: 4289957 (1981-09-01), Neyroud et al.
patent: 4409469 (1983-10-01), Yasuda et al.
Cherry Craig D.
Howard P. Guy
Davis Paul
Feix Donald C.
Freiburger T. M.
Gaffin Jeffrey A.
Pellinen A. D.
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