Incremental printing of symbolic information – Ink jet – Controller
Patent
1993-10-29
1995-06-27
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
347 19, B41J 201
Patent
active
054283760
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. Warming voltage pulses are applied to the printhead to warm the printhead to a temperature that is at least as high as a temperature that would be produced pursuant to ink firing pulses of a predetermined voltage, a predetermined pulse width, and a predetermined pulse frequency. A continuous series of ink firing pulses are then applied to the printhead, starting with a pulse energy substantially equal to the predetermined reference pulse energy and a pulse frequency equal to the predetermined pulse frequency, and then incrementally decreasing the pulse energy of the ink firing pulses. The temperature of the printhead is repeatedly sampled while the ink firing pulses are applied to the ink firing resistors to produce a set of temperature samples respectively associated with the decreasing pulse energies. A thermal turn on energy is determined from the temperature samples, and the printhead is operated at a pulse energy that is greater than the thermal turn on energy and in a range that provides a desired print quality while avoiding premature failure of the heater resistors.
REFERENCES:
patent: 5223853 (1993-06-01), Wysocki et al.
patent: 5365257 (1994-11-01), Minowa et al.
Andersen Kurt K.
Canfield Brian P.
Ix Hanno
Wade John M.
Fuller Benjamin R.
Hallacher Craig A.
Hewlett--Packard Company
Stenstrom Dennis G.
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