Thermosensitive color printing method and thermosensitive color

Details Thermosensitive color printing method and thermosensitive color Thermosensitive color printing method and thermosensitive color

1999-12-10

2000-11-28

Tran, Huan

Incremental printing of symbolic information

Thermal marking apparatus or processes

Multicolor

347212, B41J 232

Patent

active

061542415

ABSTRACT:
A thermosensitive color recording sheet includes yellow, magenta and cyan thermosensitive coloring layers formed on a support. A thermal head heats there recording sheet for recording on the yellow coloring layer while the recording sheet is transported in a forward direction through the thermal head at a speed predetermined according to a thermal sensitivity of the yellow coloring layer. A yellow fixing lamp disposed behind the thermal head in the forward direction applies near ultraviolet rays to the recording sheet to fix the yellow coloring layer. The yellow fixing lamp is maintained at an irradiance set value while the recording sheet is transported in the forward direction. The irradiance set value is determined based on a maximum irradiance of the yellow fixing lamp that is measured prior to the thermal recording on the yellow coloring layer while driving the yellow fixing lamp by a drive pulse signal at a maximum duty factor. The recording sheet is then transported in a rearward direction under the yellow fixing lamp, to refix the yellow coloring layer. For the refixing, the yellow fixing lamp is maintained at a second irradiance set value determined based on a second maximum irradiance of the yellow fixing lamp that is measured at the end of the forward transport of the recording sheet, whereas the recording sheet is transported the rearward direction at a transport speed determined in accordance with the second irradiance set value.

REFERENCES:
patent: 5486856 (1996-01-01), Katsuma et al.
patent: 5892530 (1999-04-01), Ueda et al.

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