Thermal ink-jet printhead with a thermally isolated heating elem

Details Thermal ink-jet printhead with a thermally isolated heating elem Thermal ink-jet printhead with a thermally isolated heating elem

1996-04-16

1998-05-12

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 62, B41J 205

Patent

active

057513155

ABSTRACT:
An ejector for a thermal ink-jet printhead includes a heating element defined on a main surface of a silicon heater chip. A cavity is disposed within the heater chip opposite the side of the heating element exposed to liquid ink. In one embodiment, the heating element is disposed on a narrow pillar which is surrounded by two elongated trenches. In another embodiment, the heating element is suspended over a cavity by narrow supports. In each case, the cavity reduces the thermal mass of the structure supporting the heating element and acts as an insulator to prevent excess heat from being dissipated into the body of the heater chip.

REFERENCES:
patent: 4532530 (1985-07-01), Hawkins
patent: 4719477 (1988-01-01), Hess
patent: 4894664 (1990-01-01), Pan
patent: 5017941 (1991-05-01), Drake
patent: 5506608 (1996-04-01), Marler

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