Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1989-07-03
1990-08-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
101181, G01N 2186
Patent
active
049489828
ABSTRACT:
An optical scanner scans the surface of printed material at a particular position of the surface to determine if the surface is properly marked. The output level of the scanner at that position is compared with the output level of a differential signal level generator. If the two levels are substantially the same, then no error is indicated. If the two levels are different, then an error is indicated and the process is stopped to correct the error.
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patent: 4808832 (1989-02-01), Doggett
patent: 4857745 (1989-08-01), Gough
Allen Stephone B.
Nelms David C.
Somerville Packaging
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