Magnetostrictive element
US5357232A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Dec 2, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R15/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetostrictive element includes a magnetostrictive member, an outer magnet disposed coaxially about, spaced apart from, and surrounding the magnetostrictive member, and a soft magnetic yoke for magnetically coupling the magnetostrictive member and the outer magnet to form a closed magnetic circuit. The magnetostrictive member may be either solid or hollow. In the latter case, an inner magnet is disposed coaxially within the magnetostrictive member for producing a biased DC magnetic field. An axial length of the outer magnet is made shorter than an axial length of the magnetostrictive member. In either case, the outer magnet is spaced apart from the magnetostrictive member so that a more uniform magnetization distribution is produced in the magnetostrictive member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.