公开(公告)号：JP2002319217A

公开(公告)日：2002-10-31

申请号：JP2001121342

申请日：2001-04-19

Applicant: SONY CORP

Inventor： ISHIMOTO TSUTOMU ,  KONDO TAKAO

IPC: G11B17/028

Abstract: PROBLEM TO BE SOLVED: To restrain distortion generated to a minimum level, when a optical disk is clamped, or to make the frequency of the variation of the amount of surface wobbling lower. SOLUTION: An optical disk 1 is fixed on a turntable 5 via an O-ring 3 by sucking the center pin 2 with the suction pressure of a vacuum suction device 6. Consequently, compared with the case where the optical disk 1 is fixed directly with the center pin 2, the contact point of the optical disk 1 and the center pin 2 is made smaller, and the possibility that the optical disk 1 is sucked via impurities, such as foreign particles, adhered to the center pin 2 and distorted as a consequence becomes lower. Moreover, the turntable 5 is set to not to make contact with the optical disk 1, in regions other than the central part of the optical disk, hence the distortion of the optical disk 1 can be reduced as compared with that of the conventional fixing method to the turntable which is based on the entire surface suction of the optical disk 1.

公开(公告)号：JP2002319160A

公开(公告)日：2002-10-31

申请号：JP2001125006

申请日：2001-04-23

Applicant: SONY CORP

Inventor： ISHIMOTO TSUTOMU ,  SAITO KIMIHIRO

IPC: G11B7/005 ,  G11B7/09 ,  G11B7/135 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To provide a signal recording device which stably carries out gap control to control the distance between an optical means and an optical recording medium in a proximity field, and to provide a signal recording method, a signal reproducing device and a signal reproducing method. SOLUTION: In a band-limited circuit 20, the frequency band of an inputted return light quantity S1 is limited within a gap control band, and a return light quantity S2 after a band limitation not influenced by a modulation by the information source 1 of a laser beam LB1 for recording, the surface roughness of a glass master disk 17, the resonance of an exposure device, etc., is outputted. The return light quantity S2 after the band limitation is inputted in a gap controller 21, and gap control to fix the distance between an optical head 16 and a glass master disk 17 is carried out by a gap control voltage S3 outputted from the gap controller 21.

公开(公告)号：JP2002319156A

公开(公告)日：2002-10-31

申请号：JP2001120706

申请日：2001-04-19

Applicant: SONY CORP

Inventor： ISHIMOTO TSUTOMU

IPC: G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/135 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To carry out stable gap control without being influenced by the modulation of a recording signal when recording or reproducing the signal by using a proximity field. SOLUTION: A modulation removing circuit 23 converts a totally reflected return light quantity S1 from an optical head 15 into a totally reflected return light quantity S2 in which the effect of the modulation is removed. A gap controller 24 controls the distance between the optical head 15 and a glass master disk 16 according to the return light quantity (totally reflected light quantity S1). The distance between the optical head 15 and the glass master disk 16 is constantly controlled according to the return light quantity S2 converted by the modulation removing circuit 23. Thereby, the stable gap control is carried out without being influenced by the modulation of the recording signal.

公开(公告)号：JP2002092906A

公开(公告)日：2002-03-29

申请号：JP2000274201

申请日：2000-09-08

Applicant: SONY CORP

Inventor： ISHIMOTO TSUTOMU

IPC: G11B7/004 ,  G11B7/085 ,  G11B7/09 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To avoid the collision of an objective lens with a defective projecting part on an optical recording medium when making the objective lens having a high numerical aperture approach a medium surface to record an information signal in high density. SOLUTION: A laser element 4 emits a laser beam for recording the information signal on a glass master disk 16. The aspherical lens in an optical head 15 condenses the laser beam from the laser element 4 onto the glass master disk 16. A SIL(Solid Immersion Lens) in the optical head 15 realizes a larger numerical aperture than the numerical aperture of the aspherical lens. A laser element 21 emits a laser beam for disturbance detection onto the glass master disk 16. A focus controller 33 holds the distance between the end surface 45 of the SIL 44 and the glass master disk 16 constant. The optical head protecting device 35 protects the SIL 44 and the glass master disk 16 on the basis of a light beam returning from the glass master disk 16 originating from the laser beam emitted from the laser element 21 and condensed on a position preceding a position on which the SIL 44 condenses the laser beam.

公开(公告)号：JPH11213390A

公开(公告)日：1999-08-06

申请号：JP880998

申请日：1998-01-20

Applicant: SONY CORP

Inventor： KOBAYASHI SEIJI ,  ISHIMOTO TSUTOMU ,  YAMATSU HISAYUKI

IPC: G11B7/24 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/20

Abstract: PROBLEM TO BE SOLVED: To make second information such as characters and graphics to be recorded on a disk recordable without using an output difference of laser and to make clearer second information recordable by using the output difference jointly. SOLUTION: This optical information recording device consists of a modulation circuit 4 which generates a first modulation signal SB in accordance with first information SA, a orthogonal coordinate position detection circuit 5 which detects relative position information on a disk master plate 2 of a pickup, a character signal generation circuit 6 which generates second information SE in accordance with relative position information, a second modulation circuit 8 which changes a part of the modulation signal SB in accordance with second information SE, and an optical modulator 10B which modulates laser light in accordance with an output SD of the second modulation circuit 8. Second information which can be visually confirmed can be recorded in an area where first information like music or video is recorded.