公开(公告)号：EP1492113A4

公开(公告)日：2008-01-23

申请号：EP04706863

申请日：2004-01-30

Applicant: SONY CORP

Inventor： MATSUDA MIKINORI ,  KANADA TOKIO ,  KURITA KAZUHITO ,  TOBITA MINORU ,  NODA AKIHIRO ,  ARIKAWA YOSHIRO ,  NAKAO SHINICHI

IPC: G11B7/004 ,  G11B11/105 ,  G11B19/12 ,  G11B23/03 ,  G11B23/28

CPC classification number: G11B23/285 ,  G11B11/10578 ,  G11B11/10584 ,  G11B11/10597 ,  G11B19/12 ,  G11B23/0303

Abstract: A recording medium can judge types of various discs and the write enabled/disabled state. A detection hole of a cartridge has opening/closing means which forms a substantially horizontal plane with respect to a reference plane of the cartridge at the position of the detection hole when the detection hole is in the closed state. Moreover, the cartridge has at least a first and a second detection hole. The second detection hole (H1) is opened/closed by the aforementioned opening/closing means while the first detection hole (H0) is always kept in the open state. In a disc drive device or a disc judgment method, the disc type and the judgment information content (such as write enabled/disabled state) by the detection hole are judged according to the open/closed state of one or more detection holes formed on the cartridge and the disc type detection result obtained by using the signal based on the reflection light from the recording medium mounted.

公开(公告)号：JPH11339286A

公开(公告)日：1999-12-10

申请号：JP14607498

申请日：1998-05-27

Applicant: SONY CORP

Inventor： ARIKAWA YOSHIRO

IPC: G11B7/09

Abstract: PROBLEM TO BE SOLVED: To provide an optical disk drive method and an optical disk device, capable of precisely measuring a DC offset contained in a tracking error signal. SOLUTION: This optical disk drive method is c provided with a means for forming a push-pull error signal PP from the differential signal of a split light receiving part by reflected light from the optical disk of a light spot, a top hold circuit 2 for holding the top peak value of the push-pull error signal PP, a bottom hold circuit 3 for holding the bottom peak value of the push-pull error signal PP, and an arithmetic circuit 4 for calculating the average of the top and bottom values; and the balance of the optical spot can be adjusted by performing tracking servo, while the offset value K based on the average is removed from the push-pull error signal PP.