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:
Oct. 22, 2002
Filed:
May. 15, 2001
Shigeyuki Takao, Fukuoka, JP;
Osamu Watanabe, Kumamoto, JP;
Kenji Tomita, Kumamoto, JP;
Hiroyuki Matsuo, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An ink jet head H is downsized by making piezoelectric elements top electrodes provided on surfaces of the piezoelectric elements that are opposite to pressure rooms and bottom electrode provided on other surfaces of the piezoelectric elements that are on the pressure rooms into thin films in piezoelectric actuators a crack covering layer made from an electric insulating material is arranged on the surfaces of the piezoelectric elements that are on the bottom electrode so that the electric insulating material is filled into the cracks in the piezoelectric elements in order to prevent the piezoelectric actuators from malfunctioning due to the cracks occurring during the film formation of the bottom electrode and piezoelectric elements