The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1997
Filed:
Nov. 17, 1993
Applicant:
Inventor:
Yumiko Ohashi, Hashima, JP;
Assignee:
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
347 69 ;
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.