Thermal head apparatus

Details Thermal head apparatus Thermal head apparatus

1995-12-20

1998-01-06

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

347194, B41J 235, B41J 2355

Patent

active

057060444

ABSTRACT:
The present provides a thermal head apparatus wherein temperatures of heat generation elements resulted from heat generation can be individually detected directly so that an abnormal condition of any heat generation element can be detected. A plurality of unit heat generation elements each formed from a resistor whose electric resistance value varies depending upon a temperature of itself are arranged in a row. A driving circuit is provided for each unit heat generation element and supplies an electric current to the unit heat generation element, and a temperature detection circuit is provided for each unit heat generation element and extracts, from the unit heat generation element, an electric signal which is obtained as a result of a variation of a resistance value caused by a variation in temperature of the unit heat generation element itself. An abnormal condition detection circuit is provided for each unit heat generation element and detects presence or absence of an abnormal condition of the unit heat generation element from an output of the temperature detection circuit.

REFERENCES:
patent: 5132709 (1992-07-01), West
patent: 5353044 (1994-10-01), Nakano et al.
patent: 5422662 (1995-06-01), Fukushima et al.

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