Optical pickup adjusting apparatus and adjusting method
US7355945B2 · kind B2 · utility
2Cited by
15References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2002 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Jul 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adjustment apparatus for adjusting an optical pickup capable of recording and/or reproducing optical discs of different sorts. The adjustment apparatus is an adjustment optical disc having a first signal recording layer of a physical format in common with a CD and a second signal recording layer of a physical format in common with a DVD. On the first and second signal recording layers, there are concentrically recorded EFM modulated data. The respective signal recording layers are provided with recording areas that are not overlapped with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.