Incremental printing of symbolic information – Thermal marking apparatus or processes – Multicolor
Patent
1994-07-20
1996-01-23
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Multicolor
347212, B41J 232, B41M 528, B41M 534
Patent
active
054868564
ABSTRACT:
A recording sheet, to be printed in a color thermal printer, includes a support and thermosensitive coloring layers of yellow, magenta and cyan formed thereon, the three coloring layers arranged from an obverse toward a reverse of the recording sheet. The recording sheet is rotated to pass under a thermal head. The rotation subjects the three coloring layers sequentially to thermal recording. With a sensor, 1st irradiance of a yellow fixing lamp is measured, as well as 2nd irradiance of a magenta fixing lamp. A target irradiance is determined from the 1st irradiance. A duty factor of a drive signal is redetermined from the 1st irradiance and the target irradiance, to actuate the yellow fixing lamp at the target irradiance. A 1st speed is previously adapted to the yellow coloring layer. The yellow fixing lamp is maintained at the target irradiance. The recording sheet is rotated at the 1st speed, for the recording to the yellow coloring layer. A 2nd speed is determined from the 1st irradiance. The recording sheet is rotated at the 2nd speed, for supplementary fixation of the yellow coloring layer with the yellow fixing lamp. A 3rd speed is previously adapted to the magenta coloring layer. The recording sheet is rotated at the 3rd speed with the 2nd irradiance maintained, for the recording to the magenta coloring layer. A 4th speed is determined from the 2nd irradiance. The recording sheet is rotated at the 4th speed, for supplementary fixation of the magenta coloring layer with the magenta fixing lamp.
REFERENCES:
patent: 5268707 (1993-12-01), Katsuma et al.
patent: 5424761 (1995-06-01), Imai
Katsuma Nobuo
Matsukawa Hiroyuki
Ueda Satoshi
Fuji Photo Film Co. , Ltd.
Tran Huan H.
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