Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1998-06-17
1999-11-30
Barlow, John
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 205
Patent
active
059929790
ABSTRACT:
For each printhead nozzle, nozzle circuitry includes a warming transistor, drive transistor and heating resistor. To maintain a threshold temperature at the printhead, a warming pulse is sent from the warming transistor to the heating resistor of one or more nozzles when the temperature falls below a prescribed temperature. To fire a nozzle a firing pulse is output from the drive transistor to the heating resistor. The warming transistor is laid out as a segmented portion of the drive transistor layout area. No layout penalty is incurred by including the warming transistor for each nozzle. The source of a warming transistor is coupled in common to the source of a drive transistor. The drain of the warming transistor is coupled in common to the drain of the drive transistor. The gates are separate. The gates receive respective warming or firing control signals. The drains are coupled to the heating resistor.
REFERENCES:
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patent: 4982199 (1991-01-01), Dunn
patent: 5109234 (1992-04-01), Otis, Jr. et al.
patent: 5122812 (1992-06-01), Hess et al.
patent: 5414245 (1995-05-01), Hackleman
patent: 5428376 (1995-06-01), Wade et al.
patent: 5475405 (1995-12-01), Widder et al.
patent: 5815180 (1998-09-01), Barbour et al.
Barbour Michael J.
Corrigan George H.
Barlow John
Brooke Michael S.
Hewlett--Packard Company
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