Optical disk device which performs auto gain control process on servo signals which perform illuminating control of a light beam on the disk's recording surface
US5862111A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0941
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk device that reads and/or writes information to or from an optical disk. The optical disk device includes a recording signal output unit to output a signal to be recorded on an optical disk, an illuminating device to illuminate a recording surface of the optical disk with a light beam, a light generation control unit to control the intensity of the light beam according to the signal to be recorded, a calculating unit to calculate a value according to the level of the signal to be recorded, a light detector to receive the reflected light from the optical disk and to convert the reflected light to an electrical signal, and a gain adjustment unit to adjust the level of the output signal from the optical detector, based on the gain according to the output value from the calculating unit, and a control unit to control the illuminating device according to the output signal from the gain adjustment unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.