Position controller and position control method of optical system and recording/reproducing apparatus and driving method thereof
US6404710B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jul 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A position controller of an optical system comprising an optical system for forming a near-field with an optical recording medium and focusing converged light to the optical recording medium; an actuator for moving the optical system in a focal direction perpendicularly intersecting a recording surface of the optical recording medium; and a control circuit for controlling the actuator so as to shorten the distance between the optical system and the optical recording medium from outside to inside the range where the near-field is formed and further maintain it inside the range; a position control method of an optical system; and a recording/reproducing apparatus and driving method thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.