Magnetic head driving device and magnetooptical recording apparatus
US5661612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1994 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Dec 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6872
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head drive device is provided with a magnetic head for generating a magnetic field, a pair of switching elements for switching a current flow direction in the magnetic head, and auxiliary coils respectively connected serially to the switching elements. The current in the magnetic head is controlled by on/off operations of the paired switching elements so as to generate a magnetic field modulated according to an information signal to be recorded. Additional switching elements are serially connected to the auxiliary coils, respectively. In magnetic field modulation recording, the additional switching elements are maintained in the on-state while the modulated magnetic field is generated by the on/off operations of the paired switching elements. In optical modulation recording, the additional switching elements and the paired switching elements are controlled so as to fix the current direction in the magnetic head to generate a magnetic field corresponding to an operation mode such as an erasing mode or a recording mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.