Thermal ink jet print head and printer temperature control appar

Details Thermal ink jet print head and printer temperature control appar Thermal ink jet print head and printer temperature control appar

1997-10-28

2000-11-28

Grimley, Arthur T.

Incremental printing of symbolic information

Ink jet

Controller

B41J 2938

Patent

active

061542296

ABSTRACT:
A thermal ink jet print head with numerous firing elements on a die, and a temperature sensor on the die with a sensor voltage output proportional to a sensed temperature. A digital to analog converter has a digital input and an output voltage proportional to the value of a digital word received by the digital input, and a comparator has a first input connected to the sensor voltage output and a second input connected to the converter voltage output. The comparator generates an equivalency signal when the converter output voltage exceeds the sensor output voltage. The print head may have a temperature controller that compares the digital word to a preselected temperature threshold value to determine if the temperature is within a selected range, and which changes the temperature of the die in response to a determination that the temperature is outside of the selected range.

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patent: 5526027 (1996-06-01), Wade et al.
patent: 5576745 (1996-11-01), Matsubara

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