Carriage recording head sandwiched by electromagnetic coil sections
US4823219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | May 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A carriage assembly for a disc operating apparatus comprising a frame, a carriage movably supported in the frame relative to the disc, an optical lens or magnetic head mounted on the carriage for recording and reproducing information on the disc, and a radial guide arrangement permitting movement of the carriage in a radial direction relative to the disc. The assembly also comprises a radial drive arrangement including an electromagnetic coil mounted to the carriage and a permanent magnet mounted to the frame. The permanent magnet is electromagnetically coupled with the electromagnetic coil for driving the carriage in the radial direction of the disc. The electromagnetic coil includes two sections which sandwich the carriage and are shaped to come into contact with each other at both sides thereof, whereby the cross section of the electromagnetic coil is hexagonal in a plane parallel to a surface of the disc. As a result, the dimensions in the radial direction of the carriage assembly are decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.