Off center heaters for thermal ink jet printheads

Details Off center heaters for thermal ink jet printheads Off center heaters for thermal ink jet printheads

1993-11-22

1995-04-25

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 42, B41J 205

Patent

active

054103401

ABSTRACT:
An ink jet printhead having off center or offset heaters or thermal transducers to reduce heater damage. The printhead has heaters located beneath channels to eject ink from the channel through a nozzle to a substrate for printing. Edge heaters are spaced away from the dicing edges of the heater plate to avoid damage resulting from dicing for assembly or from thermal expansion due to adjacent printheads if used to form a page width or large array printhead. The spacing distance between the edge heaters to adjacent equally spaced heaters on the same printhead is less than the distance between adjacent equally spaced heaters. Edge heaters are also offset from the centerline of respective channels in the printhead.

REFERENCES:
patent: Re32572 (1988-01-01), Hawkins et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4638337 (1987-01-01), Torpey et al.
patent: 4678529 (1987-07-01), Drake et al.
patent: 4774530 (1988-09-01), Hawkins
patent: 4829324 (1989-05-01), Drake et al.
patent: 5000811 (1991-03-01), Campanelli
patent: 5010355 (1991-04-01), Hawkins et al.
patent: 5160403 (1992-11-01), Fisher et al.

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