Bubble-jet type ink-jet printhead

Details Bubble-jet type ink-jet printhead Bubble-jet type ink-jet printhead

2005-04-12

2005-04-12

Brooke, Michael S. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

06877842

ABSTRACT:
A bubble-jet type ink-jet printhead is provided. When forming a doughnut-shaped bubble, the printhead allows bubbles to be first grown around the heater that surrounds the central axis of the nozzle at regular angles followed by the formation of another bubble between the earlier formed bubbles, thereby forming a larger doughnut-shaped bubble. Accordingly, this can prevent the formation of an unbalanced doughnut-shaped bubble due to variations in local resistance of the heater, which may be caused by a process error. Furthermore, the printhead allows the center of the doughnut-shaped bubble to be set on the central axis of the nozzle thus causing a droplet formed within the doughnut-shaped bubble to be ejected in a normal manner, that is, in a direction vertical to the nozzle plate.

REFERENCES:
patent: 4870433 (1989-09-01), Campbell et al.
patent: 4914562 (1990-04-01), Abe et al.
patent: 6019457 (2000-02-01), Silverbrook
patent: U1993-8456 (1993-05-01), None

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