Device for detecting a missing copy by detecting the presence or

Details Device for detecting a missing copy by detecting the presence or Device for detecting a missing copy by detecting the presence or

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.

REFERENCES:
patent: 3858052 (1974-12-01), Luska
patent: 4147104 (1979-04-01), Zernov et al.
patent: 4266123 (1981-05-01), Friberg
patent: 4363271 (1982-12-01), Horst
patent: 4528630 (1985-07-01), Sargent
patent: 4546700 (1985-10-01), Kishner et al.
patent: 4679071 (1987-07-01), Kitagawa
patent: 4798136 (1989-01-01), Tittgemeyer et al.
patent: 4808832 (1989-02-01), Doggett
patent: 4857745 (1989-08-01), Gough

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