Ink jet printer head with ink channel protective film

Details Ink jet printer head with ink channel protective film Ink jet printer head with ink channel protective film

1993-11-17

1997-01-14

Bobb, Alrick

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 2045

Patent

active

055944825

ABSTRACT:
An ink jet printer head has a piezoelectric ceramic element with a plurality of ink reservoirs wherein at least one side wall of each reservoir is made of a piezoelectric ceramic material and has an electrode for driving the piezoelectric ceramic element formed on the wall. The electrode is covered with an inorganic passive state protective film, and the protective film has a thickness of from 0.1 .mu.m to a value smaller than 1/8 of a thickness of the wall in maximum or a density of not smaller than 1.8 g/cm.sup.3. The protective film may be formed to cover all inner surfaces of each reservoir.

REFERENCES:
patent: 4879568 (1989-11-01), Bartky et al.
patent: 4887100 (1989-12-01), Michaelis et al.
patent: 4968992 (1990-11-01), Komuro
patent: 5016028 (1991-05-01), Temple
patent: 5028936 (1991-07-01), Bartky et al.
patent: 5245244 (1993-09-01), Takahashi et al.

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