Temperature sensor for an ink jet printhead

Details Temperature sensor for an ink jet printhead Temperature sensor for an ink jet printhead

B - Operations, Transporting

41

J

101/96.022

B41J 2/125 (2006.01) B41J 2/05 (2006.01) B41J 2/14 (2006.01) B41J 2/16 (2006.01)

Patent

CA 2029527

An ink jet printhead is fabricated with a resistive temperature sensor formed adjacent to the heater resistors and, in a preferred embodiment, of the same material. Temperature sensing variations between a plurality of printheads used in the same printer is achieved by trimming the thermistors to the desired resistance value while holding the printhead at the nominal set temperature. In one embodiment, the heater resistor and thermistor are formed within the same polysilicon layer, and the resistor trimmed therein. In a second embodiment, a thick or thin film resistor is formed or bonded in series with the polysilicon thermistor with the trimming being accomplished at the thick, or thin film resistor.

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