Thermal printer which detects the temperature of a thermal head

Details Thermal printer which detects the temperature of a thermal head Thermal printer which detects the temperature of a thermal head

1995-10-13

1999-02-23

Fuller, Benjamin R.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

B41J 236, B41J 237, B41J 2365

Patent

active

058749829

ABSTRACT:
A thermal printer is provided with a first temperature sensor which is disposed in a substrate of a thermal head, and a second temperature sensor disposed in a housing of the thermal printer. The thermal head has an array of heating elements, each constituted of a resistance layer formed on the substrate, and a grazed glass layer is interposed between the resistance layer and the substrate. An average temperature of the grazed glass layers is calculated from first and second temperatures detected by the first and second temperature sensors, the heat resistance of a path from the substrate to the first temperature sensor, and the heat resistance of an atmosphere in the housing. Based on the calculated temperature, electric energy to be supplied to the thermal head is changed to control heat energy generated from the thermal head.

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