Optical disk device for reproducing address information from wobbled groove
US5696742A · kind A · utility
11Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Apr 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10576
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light sensor is divided into two light receiving sections which receive light reflected by an optical disk. A first intermediate address signal is generated from a difference signal of outputs of the light receiving sections. A second intermediate address signal is generated from a sum signal of outputs of the light receiving sections. An address generating circuit generates an address signal by using the first and second intermediate address signals. An optical disk device stably generating an address signal regardless of a displacement of an objective lens and a change in reflectance of the optical disk is thus provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.