US 2003/0222933 A1 · Device for preventing printer header from overheating

Abstract

A device for preventing a printer header from overheating includes a heater driving portion which is driven in response to a heater driving control signal, a heater emitting heat using electricity which is supplied by the heater driving portion, a substrate temperature detector detecting a temperature of a header substrate where the heater is mounted, a reference voltage generator generating a reference voltage, a comparator comparing a voltage detected by the substrate temperature detector with the reference voltage, a power control portion controlling a driving voltage supplied to the heater in response to a power control signal and controlling the driving voltage in accordance with an output signal of the comparator, and a control portion controlling the heater driving portion and the power control portion in accordance with transmitted printing data. According to the device for preventing the printer header from overheating, its hardware-like construction helps to prevent the header substrate from overheating even in a case that the overheating occurring in the header substrate is not controlled due to the abnormality of the control portion. Therefore, damage to the printer header is more efficiently prevented.

Claims21

Dependent claims

A device for preventing a printer header from overheating, comprising:

a control portion generating a heater driving control signal and a power control signal;
a heater driving portion which is driven in response to the heater driving control signal;
a header substrate including a heater emitting heat using electricity which is supplied by the heater driving portion;
a substrate temperature detector detecting a temperature of the header substrate to output a detection voltage;
a reference voltage generator generating a reference voltage;
a comparator comparing the detection voltage detected by the substrate temperature detector with the reference voltage;
and
a power switching portion switching a driving voltage to be supplied to the heater in response to the power control signal and controlling the driving voltage in accordance with an output signal of the comparator;
wherein the control portion controls the heater driving portion and the power control portion in accordance with transmitted printing data.

6 more elements

Dependencies are inferred from the claim text.

Device for preventing printer header from overheating

Life of this patent

Device for preventing printer header from overheating

Life of this patent

Abstract

Claims21