Laminated piezoelectric actuator

US9123880B2 · kind B2 · utility

Assignee

• TDK CORPORATION · JP

Inventors

• Satoshi Ozawa · Hitachi, JP
• Syuuzi Itoh · Tokyo, JP
• Haruo Taguchi · Fukuyama, JP

Key dates

• Filing date: Jan 25, 2013
• Grant date: Sep 1, 2015
• Expiry date: Nov 7, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N30/50

Abstract

A laminated piezoelectric device comprising a device body 10 on which a number of piezoelectric layers 2 and internal electrodes 3, 4 are laminated, external electrodes 5, 6 electrically connected to the internal electrodes 3, 4 and formed on the surface of the device body 10, an insulation layer 7 and a resistance layer 8. The insulation layer 7 covers at least a portion wherein internal electrodes 3, 4 are exposed on the surface of the device body 10, where mechanical displacement is generated by applying voltage. The resistance layer 8 is formed to connect between external electrodes 5, 6 and has a lower electric resistance value than the insulation layer 7.