Method and apparatus for calibrating a thermistor
First Claim
1. A method for calibrating a thermistor in a liquid drop ejector, the method comprising:
- first measuring a first resistance of the thermistor of the liquid drop ejector at a first temperature;
heating the thermistor;
second measuring a transient resistance response of the thermistor through a range of varying temperatures;
generating a plot of thermistor resistance against thermistor temperature based on the first and second measuring; and
,calculating an operating temperature resistance based on the plot.
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Accused Products
Abstract
The presently described embodiments are directed to a calibration method and system for thin film thermistors that are locally heated with integrated thin film heaters. Initially, print head temperature is either measured or referenced. Then, transient thermistor resistances are measured and used to determine the thermistor resistance at a higher temperature. Notably, this calibration method is advantageously implemented as a step of an existing process without having to expose the print heads to operating temperatures. In some implementations of the presently described embodiments, trimming of the thermistors may be required once calibrated.
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Citations
6 Claims
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1. A method for calibrating a thermistor in a liquid drop ejector, the method comprising:
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first measuring a first resistance of the thermistor of the liquid drop ejector at a first temperature; heating the thermistor; second measuring a transient resistance response of the thermistor through a range of varying temperatures; generating a plot of thermistor resistance against thermistor temperature based on the first and second measuring; and
,calculating an operating temperature resistance based on the plot. - View Dependent Claims (2, 3)
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4. A system for calibrating a thermistor in a liquid drop ejector, the system comprising:
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means for first measuring a first resistance of the thermistor of the liquid drop ejector at a first temperature; means for heating the thermistor; means for second measuring a transient resistance response of the thermistor through a range of varying temperatures; means for generating a plot of thermistor resistance against thermistor temperature based on the first and second measuring; and
,means for calculating an operating temperature resistance based on the plot. - View Dependent Claims (5, 6)
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Specification