Information recording apparatus having magnetic shield means
US5446722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/20278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information recording apparatus including a device for driving an optical-disk's master disk, an electron lens barrel for having an electron beam irradiate a recording surface of a disk, a translational device for producing, between the disk and the electron lens barrel, a relative movement in a direction parallel to the recording surface and a container for enclosing the elements of the apparatus adapted to support a vacuum atmosphere. The driving device includes a turn table 4, a spindle 14a for supporting the turn table, a motor 14 for driving the spindle, and a magnetic shield for preventing magnetic fields of the motor from leaking outward. The motor is enclosed in the shield to prevent its magnetic fields from affecting the electron beam, which makes it possible to record information with high accuracy. The use of the motor as a drive source realizes easier and more responsive control of the turn table than that in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.