Copperplate printing detection method and device therefor

Details Copperplate printing detection method and device therefor Copperplate printing detection method and device therefor

1983-01-31

1986-06-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

045945144

ABSTRACT:
A method is provided for observing, preferably through the medium of an optoelectronic pick-up, the carrier to be checked which is illuminated by a light beam having an angle of incidence of at least 45.degree. through a rotary disc comprising alternately transparent and opaque sectors spaced from one another by a distance at least substantially equal to the distance measured between the lines of the copperplated printing formed on the carrier. The carrier image is formed in the plane of a detector by means of an optical system. If the carrier has a copperplate printing formed thereon, a moire effect is observed. If the pick-up extends over several transparent sectors of the disc this moire effect is converted electrically into a very pronounced periodic variation of the current delivered by the pick-up, at the sector passage frequency.

REFERENCES:
patent: 2827822 (1958-03-01), Timms
patent: 3056033 (1962-09-01), Shepard
patent: 3634012 (1972-01-01), Mustert
patent: 3851971 (1974-12-01), Koch

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