Title:
【発明の名称】光デイスク装置
Document Type and Number:
Japanese Patent JP3092756
Kind Code:
B2
Abstract:
In an optical disc apparatus for recording/reproducing desired information, e.g. a "write once, read many times" optical disc system, it is desired to securely detect speed information and address data recorded in a pregroove, even when the position of incidence of a light beam (L1) with respect to a light receiving element (24) has been changed. To this end, output signals (SA+SD, SB+SC) of light receiving surfaces of an optical pickup (6) adjacent to each other in the received radial direction of an optical disc (2) have their relative signal levels corrected so that the signal levels of RF components mixed into these output signals are equalized to each other. A difference signal thereof is then generated to recover the speed information and address data.
Inventors:
Shinichiro Iimura
Application Number:
JP21864892A
Publication Date:
September 25, 2000
Filing Date:
July 24, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G11B7/00; G11B7/004; G11B7/0045; G11B7/09; G11B27/10; (IPC1-7): G11B7/0045; G11B7/004; G11B27/10
Domestic Patent References:
| JP6435727A | ||||
| JP2166642A | ||||
| JP4113523A | ||||
| JP5225580A |
Attorney, Agent or Firm:
Keiki Tanabe