Piezoelectric conversion element having an electroded surface with a non-electrode surface portion at an end thereof
US6545395B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2001 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Feb 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/8554
Abstract
A tube-shaped piezoelectric conversion element and a method of fabricating a tube-shaped piezoelectric conversion element are provided. The piezoelectric conversion element is formed either with two electroded piezoelectric sheet elements (two-layer type) rolled up in a tube-shaped member or with a single piezoelectric sheet element (single-layer type) electroded on two opposing surfaces and folded near its center and rolled up in a tube shaped member. A non-electrode surface portion without electrode material disposed thereon is provided on at least one electroded surface of at least one piezoelectric sheet element at an end of the piezoelectric sheet element in a direction intersecting a tube-axis direction. At lease one non-electrode surface portion may also be provided on a piezoelectric sheet element in a region encompassing the fold of single-layer type device. Short circuiting between electrode layers is thereby substantially avoided at ends of the piezoelectric sheet elements or in the fold region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.