公开(公告)号：JPH11273172A

公开(公告)日：1999-10-08

申请号：JP7073098

申请日：1998-03-19

Applicant: Sony Corp ,  ソニー株式会社

Inventor： TANAKA KAYOKO ,  KIJIMA KOUICHIRO

IPC: G11B11/105 ,  G11B7/135 ,  G11B11/10

Abstract: PROBLEM TO BE SOLVED: To provide an optical pickup device for magneto-optical recording medium impressing a proper magnetic field on the recording layer of a magneto-optical recording medium efficiently and to provide the magneto-optical device provided with this pickup device. SOLUTION: A first objective lens converging a laser beam on the recording layer 12a of a magneto-optical recording medium 12 is arranged in this device and a second objective lens 3b is arranged between the first objective lens and the magneto-optical recording medium 12. A magnetic field modulation coil 1 in which a conductive body 1a is wound spirally by one layer and also which has a roughly circular hollow core part around an optical axis 4 is fixed to the surface opposite to the magneto-optical recording medium 12 of the second objective lens 3b. When the length of the direction of the optical axis 4 of the conductive body 1a is twice or more with respect to the length G of the gap between the conductive body 1a and the conductive body 1a and the length of the gap between the conductive body 1a and the recording layer 12a is A, the diameter D of the hollow core part of the magnetic field modulation coil 1 is made to be equal to or longer than (1.93×A-10) μm and to be equal to or shorter than (1.93×A+10) μm (provided that 20 μm

Abstract translation: 要解决的问题：提供一种用于磁光记录介质的光学拾取装置，其有效地在磁光记录介质的记录层上施加适当的磁场，并提供具有该拾取装置的磁光装置。 解决方案：在该装置中布置有将激光束会聚在磁光记录介质12的记录层12a上的第一物镜，并且第二物镜3b布置在第一物镜和磁光记录介质12之间。 其中导电体1a螺旋地卷绕一层并且围绕光轴4具有大致圆形的中空芯部的磁场调制线圈1固定到与第二个磁光记录介质12相对的表面 物镜3b。 当导电体1a的光轴4的方向的长度相对于导电体1a和导电体1a之间的间隙的长度G和导电体1a之间的间隙的长度为两倍或更多时 并且记录层12a为A时，使磁场调制线圈1的中空芯部的直径D为（1.93×A-10）μm以上且等于或小于（1.93 ×A + 10）μm（20μm<= A <=100μm，H <=40μm）。

公开(公告)号：JPH11328902A

公开(公告)日：1999-11-30

申请号：JP13281598

申请日：1998-05-15

Applicant: SONY CORP

Inventor： KIJIMA KOUICHIRO ,  OWA HIDEO

IPC: G11B23/00 ,  G11B7/12

Abstract: PROBLEM TO BE SOLVED: To enable the sure recording and reproducing of desired data even at the time of high-density recording and reproducing by forming a cleaning cartridge loadably in an optical disk device, supplying a washing liquid stored in a washing liquid storage means to the optical head of the optical disk device and wiping the foreign matter sticking to the optical head. SOLUTION: The cleaning cartridge 10 is formed in its external shape to the same shape as the shape of the cartridge of the disk and may be loaded in the optical disk device in place of the cartridge. The cartridge 10 has a case 40 of a flat planar shape internally having a space and is arranged with a shutter 41 of the same shape as the shape of the shutter of the cartridge in the case 40. The case 40 is partitioned slender in the internal space by a wall 40A along the end face on the side reverse from the side arranged with the shutter 41 and the space is allocated to the storage tank 42. A system control circuit executes the cleaning treatment of the optical head by urging the loading of the cleaning cartridge 10.

公开(公告)号：JPH11283257A

公开(公告)日：1999-10-15

申请号：JP8173198

申请日：1998-03-27

Applicant: SONY CORP

Inventor： KIJIMA KOUICHIRO ,  OSATO KIYOSHI

IPC: G11B7/09 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To surely perform focus servo even when an optical lens is held in optical contact with an optical disk. SOLUTION: The light converging means 41 of an optical pickup is composed of a first optical convergence system 43 and a second optical convergence system 44 in this order from the side of an optical disk 1, and the first optical convergence system 43 is held at a prescribed distance in the focus direction by a holding means 43b and is provided with a reflection part 46 out of the optical axis of the surface on the side of the optical disk 1. Shifting of the second optical convergence system 44 is controlled in the focus direction, and based on the light of a side beam reflected by the reflection part of the first optical convergence system, a servo circuit performs focus servo control of the light converging means by controlling the shifting of the second optical convergence system in the focus direction.

公开(公告)号：JPH11328901A

公开(公告)日：1999-11-30

申请号：JP13280098

申请日：1998-05-15

Applicant: SONY CORP

Inventor： KIJIMA KOUICHIRO ,  OWA HIDEO

IPC: G11B23/00 ,  G11B7/12

Abstract: PROBLEM TO BE SOLVED: To enable sure recording and reproducing of desired data even at the time of high-density recording and reproducing by condensing a light beam to an optical recording medium, supplying a washing liquid to the recording medium side surface of the condensing head and wiping foreign matter. SOLUTION: A cleaning head 10 is arranged on the outer peripheral side of a magneto-optical disk 2 on the side reverse from an optical head 3 with respect to the magneto-optical disk 2. When the optical head 3 moves to a prescribed position, the cleaning head is driven by a cleaning head drive mechanism 11 to supply the washing liquid to the optical head 3. The cleaning head 10 removes the foreign matter sticking to the optical disk side of the optical head 3 by removing the washing liquid. A system control circuit monitors the signal level of the regenerative signals MO, RF obtd. via a regenerative signal processing circuit and controls the operation of a servo circuit and a cleaning head drive mechanism 11 at the time of loading and discharging of the optical disk 2 when the change in the light quantity of the return light falls to the prescribed value or below.

公开(公告)号：JPH11316986A

公开(公告)日：1999-11-16

申请号：JP12578498

申请日：1998-05-08

Applicant: SONY CORP

Inventor： KOCHIYAMA AKIRA ,  KIJIMA KOUICHIRO

IPC: G11B11/10 ,  G11B7/12

Abstract: PROBLEM TO BE SOLVED: To prevent thermal damage to a thin-film coil and to enable sure recording of desired data by forming a thermally conductive film consisting of material having the thermal conductivity higher than that of a coil supporting member transparent to a light beam on the surface of this member and forming a thin-film coil for impressing a desired modulation magnetic field to the position irradiated with a light beam. SOLUTION: The coil supporting member 43 is arranged at a holder 41 in parallel with the flat surface of a front lens 17A and the thin-film coil 45 is arranged on the surface of the coil, supporting member 43 facing a magneto- optical disk 2. The thin-film coil 45 is formed on the coil supporting member 43 successively via the thermally conductive film, a magnetic layer and an insulating layer. The thermally conductive film is obtd. by forming an aluminum oxide film, aluminum nitride film or boron nitride film having the thermal conductivity higher than the thermal conductivity of glass material which is transparent to the laser beam and constitutes the coil supporting member 43 on the thin-film coil 45 side of the coil supporting member 43. This film efficiently conducts the heat by the thin-film coil 45 to the coil supporting member 43.