Method for detecting unusable donor in a dye donor web

Details Method for detecting unusable donor in a dye donor web Method for detecting unusable donor in a dye donor web

1994-04-29

1995-08-08

Hess, B. Hamilton

Record receiver having plural interactive leaves or a colorless

Having plural interactive leaves

356239, 428195, 428913, 428914, B41M 5035, B41M 538, G01N 2100

Patent

active

054398711

ABSTRACT:
A method and apparatus for detecting defects in a dye donor web having repeating series of patch colors. If defective regions in a dye donor web are found during manufacture, an opaque mark is physically placed on a color patch of the repeating series in which the defect occurs. As the dye donor web is advanced, two beams of light of a color to which the color patch is transmittable impinge on the dye donor web. The beams are in substantial alignment in a direction transverse to the web path and are positioned such that the mark (if present) aligns with one of the two light beams and not the other beam. By sampling the transmission or non-transmission of the two light beams through the dye donor web, a signal can be generated whenever the simultaneous non-transmission of the one light beam and transmission of the other light beam is detected.

REFERENCES:
patent: 4588329 (1985-12-01), Honda

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