Flux extender or guide for magnetic read head having a magnetoresistive flux sensor
US4291351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Nov 28, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/3919
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A flux extender or guide for a magnetic read head having a magnetoresistive read element. The element is mounted on a substrate, contained, for example, in a hand-held wand structure. The element is spaced from the contact portion of the wand, to permit a small amount of wear of the head to take place, before the read element comes into contact with the record media. In order to increase the spacing between the magnetoresistive element and the contact portion of the wand, the flux guide or extender is utilized. The flux guide or extender is a wedge-shaped piece of magnetizable material. At the end of the flux guide closest to the read element, the guide is approximately as wide as the element and tapers down to approximately three quarters of its top width at the lower end of the guide. The guide is of uniform thickness and thicker than the read element. The cross-sectional area is selected to be from two to three times the cross-sectional area of the read element. The flux guide is preferably fabricated from a magnetic material which is non-corrosive or less corrosive than the read element and having a higher value of flux density than the element. The width of the guide at the lo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.