Incremental printing of symbolic information – Thermal marking apparatus or processes – Including cooling device
Reexamination Certificate
2006-04-18
2006-04-18
TRan, Huan (Department: 2861)
Incremental printing of symbolic information
Thermal marking apparatus or processes
Including cooling device
C347S018000
Reexamination Certificate
active
07030898
ABSTRACT:
A color thermal printer is provided with a cooling fan for cooling a thermal head and a fan rotational speed controller for controlling the rotation speed of the cooling fan, a head temperature sensor for measuring a temperature of the thermal head and an environmental temperature sensor for measuring an environmental temperature around the thermal head. A controller predicts the head temperature in each recording position based on the printing rate (printing density) calculated from the image data, a measured temperature of the thermal head and a measured environmental temperature, and also predicts a delay time of a heat transmitting system and a measuring system based on a fluctuation of the printing rate. The controller controls an air amount of the cooling fan in each recording position based on the predicted temperature and the delay time.
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