Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-02-23
1994-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235467, G06K 710
Patent
active
053171667
ABSTRACT:
A system apparatus for altering the depth of field of a lens mechanism for use with a bar code. The altering of the mechanism allows different focal points and increased depths of field to be selected to accommodate different container sizes. The system is also designed to provide a variable threshold which adjusts the receiving circuitry based upon the amplitude of the signal received from the scanned label. Additionally, the system may be operated in a mode which introduces alternate threshold switching for allowing labels of low contrast bar and space elements to be successfully scanned along with elements of high contrast. Incorporated into the apparatus is a technique for adjusting the circuitry when there is a reduction of the power output of the beam generating laser.
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Kuypers Rene A.
Murphy Joseph F.
Nelms David C.
PSC Inc.
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