Magnetic head
US6538843B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | May 5, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/332
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a high-frequency impedance type magnetic head having high impedance and capable of efficiently detecting a change in impedance, an electrically conductive metal film is sandwiched between two soft magnetic films, and the two soft magnetic films form a portion of a magnetic path. The thickness of one soft magnetic film is smaller than the thickness of the other soft magnetic film. The electrically conductive metal thin film has a pair of electrodes at respective ends thereof, to which are connected an oscillator for applying a high frequency carrier signal to the electrodes and a high frequency amplifier having a demodulator circuit. Further, an electrically conductive metal film winding is provided, and a DC current is applied to the electrically conductive metal film winding at the time of reproduction, while on the other hand, a signal current is applied to the electrically conductive metal film winding at the time of recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.