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:
Apr. 15, 2008
Filed:
Dec. 10, 2002
Hiroaki Asano, Yokkaichi, JP;
Shinichi Okamoto, Kariya, JP;
Hiroaki Asano, Yokkaichi, JP;
Shinichi Okamoto, Kariya, JP;
Denso Corporation, , JP;
Abstract
The present invention provides a piezoelectric actuator with excellent durability. In the present invention, a piezoelectric elementin which a plurality of piezoelectric layers that expand in accordance with an applied voltage, and internal electrode layers for supplying an applied voltage, are alternately laminated, and at least a part of the side surfacesandthereof is covered by an external packaging resin, the piezoelectric elementbeing housed in a sealed containerthat substantially isolates it from the external atmosphere, and in which the internal atmosphereis replaced by an inert gas. Alternatively, the piezoelectric elementis housed in a sealed containerthat substantially isolates it from the external atmosphere, and the external packaging resinincludes an antioxidant.