System and method of thermally verifying freshly printed images

Details System and method of thermally verifying freshly printed images System and method of thermally verifying freshly printed images

1996-01-19

1998-09-29

Wong, Peter S.

Incremental printing of symbolic information

Ink jet

Controller

347 98, 382135, 358406, B41J 29393, B41J 2015, H04N 100

Patent

active

058151745

ABSTRACT:
A system and method for detecting a latent image formed with an invisible ink. A mechanism, such as a heater for heating the ink, provides a temperature differential between the ink and the substrate. An ink delivery system such as an ink jet printer applies the ink to the substrate to form a latent image thereon. A heat-sensitive scanning device scans the substrate and outputs an electrical signal corresponding to the temperature differential between the ink and the substrate before the ink reaches thermal equilibrium with the substrate. The electrical signal includes information representative of the image on the substrate, and may be displayed, recorded and/or processed as desired to verify the image.

REFERENCES:
patent: 3916194 (1975-10-01), Novak et al.
patent: 4864618 (1989-09-01), Wright et al.
patent: 4893558 (1990-01-01), Gouch
patent: 5521722 (1996-05-01), Colville et al.
patent: 5547501 (1996-08-01), Maryuama et al.

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