Optical recording medium driving apparatus capable of accurately detecting position of optical head
US5459705A · kind A · utility
17Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1992 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jul 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00718
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical recording medium driving apparatus, only a frequency component corresponding to pits of an ID portion is detected from a total signal representing a total amount of reflected light from an optical disc by a high pass filter. With this frequency component clamped so that a potential at a maximum point becomes a definite potential, a changed amount of light of the total signal corresponding to pits is detected and a phase pit signal is generated. In response to this phase pit signal, a signal component corresponding to pits is removed from the total signal, thereby generating a pit removal signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.