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

1994-11-21

1995-09-05

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

With recording medium

3461351, 503200, B41M 500

Patent

active

054482844

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 includes a reference slightly opaque portion at the part thereof having the reflectance equivalent to a slight opacity state of the thermally reversible thermosensitive recording material in an early stage or a 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 device employing the judging method.

REFERENCES:
patent: 4442429 (1984-04-01), Kotani et al.
patent: 5158924 (1992-10-01), Konagaya et al.
patent: 5229350 (1993-07-01), Shinagawa et al.

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