Thermally reversible printing system with ambient temperature co

Details Thermally reversible printing system with ambient temperature co Thermally reversible printing system with ambient temperature co

1994-02-17

1995-09-26

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

With correction or erasing means

3461351, 347211, 347224, B41J 232, B41M 526

Patent

active

054537657

ABSTRACT:
A printing system for recording and erasing a visible image onto and from a recording medium presenting two states, recording and erasing, by different heating processes, comprises a temperature sensor for sensing ambient temperature, a thermal head, a circuit for computing the temperature difference between a reference ambient temperature and the ambient temperature obtained from the sensor, a circuit for controlling the electrically energizing time of the thermal head in accordance with the temperature difference obtained at the computing circuit, and means for controlling the supply voltage to the thermal head according to the temperature difference. When ambient temperature around the system is lower than the reference ambient temperature, the electrically energizing time of the thermal head is increased. When the ambient temperature is higher than the reference ambient temperature, the supply voltage to the thermal head is decreased. By recording or erasing a visible image in this way, the effect of ambient temperature is corrected, thereby making it possible to always record or erase a visible image onto or from a recording medium stably.

REFERENCES:
patent: 4696528 (1987-09-01), Dabisch
patent: 4851924 (1989-07-01), Nakamura et al.
patent: 5274460 (1993-12-01), Yamada et al.
"Proceedings of 4th Japanese Symposium on Non-impact Printing Technologies Symposium", Reversible Thermosensitive Material and Printing Characteristics, pp. 57-60, Jul. 1987, Yoshihiko Hotta & Keish Kubo.
"Japan Hardcopy `90", The Annual Conference of Japan Hardcopy for the Society of Electrophotography of Japan Rewritable Leuco-Thermal Recording Medium, pp. 147-150, Jun. 1990, Yoshihiro Nino & Niro Watanabe.

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