Thermal ink jet printhead with recirculating cooling system

Details Thermal ink jet printhead with recirculating cooling system Thermal ink jet printhead with recirculating cooling system

1989-11-06

1991-05-21

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, 361385, B41J 205

Patent

active

050179411

ABSTRACT:
A thermal ink jet printer is disclosed having a printhead with a passageway therein for the circulation of a cooling fluid therethrough. The passageway is parallel and closely adjacent the array of bubble generating heating elements. When the printhead is composed of mated silicon channel and heater plates, the passageway is formed in one embodiment by forming a groove in the heater plate surface opposite the one containing the heating elements and addressing electrodes followed by the mating of a silicon sealing plate having inlet and outlet openings etched therein. Tubes for circulating a cooling fluid, such as ink, are sealingly attached to the inlet and outlet openings. In an alternative embodiment, the groove may be formed in the sealing plate or in both the sealing plate and the printhead heater plate. In another embodiment, the passageway for the cooling fluid is provided by etching a channel in a thick film layer deposited on the heater plate surface opposite the one with the heating elements. The circulated cooling fluid prevents printhead temperature fluctuations during the printing operation.

REFERENCES:
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patent: 4638337 (1987-01-01), Torpey et al.
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patent: 4774630 (1988-09-01), Reisman
patent: 4791440 (1988-12-01), Eldridge
patent: 4831390 (1989-05-01), Deshpande et al.
patent: 4896172 (1990-01-01), Nozawa

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