Apparatus for optically recording data into a disc
US6115336A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an apparatus for optical recording, reproducing and erasing data into or from a recording medium, including an optical head for recording, reproducing or erasing data into or from a recording medium by emitting a light to the recording medium, the optical head including at least an objective lens and a laser diode, a sensor for sensing a thickness of the recording medium, and a focal distance compensator for varying a focal distance of the light in accordance with a thickness sensed by the sensor, the focal distance compensator including a convex lens located between the objective lens and the laser diode and designed to be able to located in or out of an optical path. In accordance with the above-mentioned apparatus, a thickness of a recording medium is readily measured by the sensor, and the focal distance compensator adjusts a focal distance of a light emitted from the light source in accordance with the measured thickness of a recording medium. Hence, it is always possible to properly record, reproduce and erase data into or from a recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.