Registers – Coded record sensors – Particular sensor structure
Patent
1998-08-12
2000-11-28
Le, Thien M.
Registers
Coded record sensors
Particular sensor structure
235454, 235472, 235459, 359558, 359559, G06K 922
Patent
active
061523712
ABSTRACT:
A method and apparatus for reading and decoding one-dimensional (1D) bar code symbols. A 1D bar code symbol is imaged by an optical assembly which includes a cubic phase mask that causes the optical transfer function of the optical assembly to remain approximately constant over a range of distances between the apparatus and the symbol to be read. An electrical representation of the resulting image is converted to a smoothly varying analog image signal. A transition identifying circuit processes the analog image signal, without first applying a recovery function that takes into account the effect of the phase mask, and generates a binary signal which is used to decode the symbol.
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Canale James L.
Hunter Vivian L.
McEnery Dennis W.
Schwartz Eric D.
Felten Daniel
Le Thien M.
Welch Allyn Inc.
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