Core structure with L-shaped back member and magnetic bonding material
US3940798A · kind A · utility
Inventor
Key dates
| Filing date | Sep 30, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Sep 30, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/29
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a magnetic recording head and specifically the back bar of a multi-channel magnetic recording head for use in high performance multitrack disc files. Crosstalk is substantially reduced by incorporating a specially shaped back bar, such as a back bar having an L-shaped cross section to enclose and reduce the crosscoupling fringing fields from the back gaps. In addition, the use of an epoxy with a magnetic filler material is included to further reduce the back gap fringing fields. The above-mentioned techniques when used in combination with a limited dimension intertrack shield can greatly reduce the crosstalk between cores of a high track density flying head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.