Printhead temperature controller that uses nonprinting pulses

Details Printhead temperature controller that uses nonprinting pulses Printhead temperature controller that uses nonprinting pulses

1991-05-01

1992-12-01

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, B41J 205

Patent

active

051682842

ABSTRACT:
This document discloses a method and apparatus for real-time control of the temperature of thermal ink jet printheads and thermal printheads through the use of nonprinting pulses. A closed-loop system produces nonprinting pulses in response to a difference between a reference temperature signal and a printhead temperature signal produced by a temperature sensor on the printhead so that the printhead operates at a constant elevated temperature. The reference temperature signal can specify an operating temperature anywhere between 10.degree. C. and 100.degree. C. above room temperature. The closed-loop system can have multiple loops with different response times so that complex nonlinear responses to changes in the printhead temperature can be obtained. The open-loop system transmits nonprinting pulses to the printhead for each printing interval that the printer does not eject a drop. Also, this document discloses a method for measuring the energy transfer characteristics of a printhead. This method is used to determine how much energy open-loop nonprinting pulses should transmit within one printing interval to the printhead to prevent fluctuations in the temperature of the printhead caused by variations in the printer output.

REFERENCES:
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patent: 4797837 (1989-01-01), Brooks
patent: 5046859 (1991-09-01), Yamaguchi
patent: 5109234 (1992-04-01), Otis, Jr. et al.

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