DISCONNECTION DETECTING DEVICE FOR THERMAL HEAD

Japanese Patent JP3725914

B2

PURPOSE: To obtain a disconnection detecting device capable of detecting number of heating resistors having disconnections in a thermal head with high accuracy in a short time by a low detection voltage.
CONSTITUTION: A disconnection detection voltage Vi of which voltage level is sufficiently lower than a thermal head driving standard voltage VH is applied to a non-inverting input terminal of an operational amplifier 11 and a fixing resistor RO is connected between the output terminal and the inverting input terminal. A terminal (a) of a switch 12 is connected to the inverting input terminal. A reference power supply 1 for driving the thermal head and a first capacitor C1 are connected to a terminal (b) in parallel and a common terminal of the switch 12 is connected to the thermal head 5. In a print mode, the switch 12 is switched to a side of the terminal (b), then normal printing is executed and in a disconnection number detecting mode, the switch 12 is switched to a side of the terminal (a), then a plurality of heating resistors 6 of the thermal head 5 are controlled to be simultaneously energized so that the number of heating resistors 6 having disconnections is detected by virtue of deviation of the output voltage of the operational amplifier 11.

JP3043042	[Title of the Invention] A thermal printer and a printing processing method thereof.
JPS57174277	HEAT SENSITIVE RECORDING HEAD
JPH09248926	DATA CORRECTION CIRCUIT FOR THERMAL HEAD

Akimitsu Kojima
Masahiko Yamamoto

JP14268195A

December 14, 2005

May 16, 1995

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ISHIDA CO.,LTD.

B41J2/35; (IPC1-7): B41J2/35

JP60159662A
JP4201358A

Shuji Sugimoto
Masashi Noda

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