Printhead warming method to defeat wait-time banding

Details Printhead warming method to defeat wait-time banding Printhead warming method to defeat wait-time banding

1990-09-14

1992-04-28

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, 346 76PH, B41J 2365, B41J 238

Patent

active

051092344

ABSTRACT:
A thermal technique for reducing print density shifts due to print wait time in thermal ink jet printers. The ink jet firing resistors of the printhead are driven with warming pulses having a pulse width insufficient to cause ink drop firing at the warming pulse frequency. They are driven for an interval that depends on the amount of time that has elapsed since printing by the printhead last occurred, or an interval that depends on the amount of decrease in the printhead temperature since printing stopped. In a particular embodiment of the printhead warming technique, the warming pulses have the same amplitude as the ink drop firing pulses, and a higher frequency.

REFERENCES:
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4490728 (1984-12-01), Vaught et al.
patent: 4712172 (1987-12-01), Kiyohara et al.
patent: 4791435 (1988-12-01), Smith et al.

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