Thermal ink jet device with improved heating elements

Details Thermal ink jet device with improved heating elements Thermal ink jet device with improved heating elements

1989-03-30

1990-06-19

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

338333, B41J 205

Patent

active

049357522

ABSTRACT:
A thermal ink jet printhead is improved by using heating element structures which space the portion of the heating element structures subjected to the cavitational forces produced by the generation and collapsing of the droplet expelling bubbles from the upstream electrode interconnection to the heating element. In one embodiment this is accomplished by narrowing the resistive area where the momentary vapor bubbles are to be produced so that a lower temperature section is located between the bubble generating region and the electrode connecting point. In another embodiment, the electrode is attached to the bubble generating resistive layer through a doped polysilicon descender. A third embodiment spaces the bubble generating portion of the heating element from the upstream electrode interface, which is most susceptible to cavitational damage, by using a resistive layer having two different resistivities.

REFERENCES:
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patent: 3629782 (1971-12-01), Sahni
patent: 4339762 (1982-07-01), Shirato et al.
patent: 4370668 (1983-01-01), Hara et al.
patent: 4532530 (1985-07-01), Hawkins
patent: 4567493 (1986-01-01), Ikeda et al.
patent: 4686544 (1987-08-01), Ikeda et al.
patent: 4725859 (1988-02-01), Shibata et al.
patent: 4792818 (1988-12-01), Eldridge
patent: 4831391 (1989-05-01), Asai

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