Rewriteable card, printing apparatus for printing the card and a

Details Rewriteable card, printing apparatus for printing the card and a Rewriteable card, printing apparatus for printing the card and a

1993-11-29

1995-09-05

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

B41J 232

Patent

active

054482798

ABSTRACT:
A rewriteable card of the invention is composed of a thermally reversible thermosensitive recording material which changes reversibly between a slightly opaque state and a transparent state depending on a given heating condition wherein the rewriteable card is characterized in including a reference slightly opaque portion at the part thereof having the reflectance equivalent to slight opacity state of the thermally reversible thermosensitive recording material in the early stage or the last stage of use of the rewriteable card. A method of judging the life of the rewriteable card is based on the result of detection of the reflectance on a printing slightly opaque portion and that on the reference slightly opaque portion, and a printing apparatus is provided with a card life judging means employing the judging method.

REFERENCES:
patent: 5274460 (1993-12-01), Yamada et al.
patent: 5371522 (1994-12-01), Miyawaki et al.

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