Determining the operating energy of a thermal ink jet printhead

Details Determining the operating energy of a thermal ink jet printhead Determining the operating energy of a thermal ink jet printhead

1993-05-03

1995-05-23

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Controller

347 19, 347 57, B41J 205

Patent

active

054185580

ABSTRACT:
A method for operating a thermal ink jet printer including a printhead having ink firing heater resistors responsive to pulses provided to the printhead. A sequence of pulse bursts of respective increasing or decreasing pulse energies that span a predetermined pulse energy range is applied to the printhead, each pulse burst comprised of a plurality of pulses having a pulse energy that is associated with such pulse burst and is constant for all pulses in such burst, and each burst having a sufficient number of pulses to allow the printhead to achieve a steady state operating temperature at the pulse energy of the pulse burst. A steady state operating temperature sample is determined for each of the sequence of pulses bursts of different pulse energies to produce a set of temperature samples respectively associated with the increasing pulse energies, and a turn on pulse energy is determined from the temperature samples. The thermal ink jet printhead is then operated with a pulse energy that is greater than the turn on pulse energy and in a range that provides a desired print quality while avoiding premature failure of the heater resistors.

REFERENCES:
patent: 4860034 (1989-08-01), Watanabe
patent: 4872028 (1989-10-01), Lloyd
patent: 5023626 (1991-06-01), Kawamura
patent: 5036337 (1991-07-01), Rezanka
patent: 5223853 (1993-06-01), Wysocki

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