Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-12-24
1994-09-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250568, G06K 710
Patent
active
053450892
ABSTRACT:
An optical scanning system comprises an optical scanner, a first circuit for generating a reference pulse and a second circuit for comparing a benchmark pulse scanned by the scanner to the reference pulse. The comparing circuit provides an indicating signal of one of a less than, a greater than and an equal to signals as a result of the comparison. There is a third circuit for adjusting sensitivity of the scanner based on the indicating signal. In one embodiment a visual indication is provided to distinguish between the less than, greater than and equal to signals so that a manual adjustment can be made to the scanner sensitivity. In another embodiment, automatic adjustments are made if a predetermined number of less than or greater than signals are provided before an equal to signal is provided by the comparing circuit.
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Lorenzo John L.
Mol Hans C.
Malandra, Jr. Charles R.
Nelms David C.
Pitney Bowes Inc.
Scolnick Melvin J.
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