Recording/reproducing optical head apparatus compatible with different optical media
US5930214A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head apparatus includes a stationary optical system having a light source and a detector for detecting light reflected by a recording medium, which stationary optical system is arranged at a position fixed to the recording medium. Plural objective lenses for focusing/irradiating light emitted from the light source onto the recording medium are arranged on a rotating blade which is provided to be rotatable in a direction parallel to the recording medium. By controlling the waveform of a current to be supplied to a tracking coil, the blade is rotated and a desired one of the objective lenses is located on an optical axis of the light irradiated onto the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.