公开(公告)号：JPH04372753A

公开(公告)日：1992-12-25

申请号：JP17743091

申请日：1991-06-21

Applicant: SONY CORP

Inventor： FUJITA GORO

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To control the variation of a gain of a height servo due to the deviation, etc., of the reflection rate of a disk. CONSTITUTION:Light from an auxiliary light source LED is reflected with the disk and is made incident on optical detectors 10a, 10b. Each output of optical detectors 10a, 10b is supplied to a differential amplifier 20 and an adder 50 and the output of the differential amplifier 20 becomes a height error signal. The height error signal is controlled by a variable gain amplifier 60 so as to be constant at a gain in accordance with the addition output of the adder 50. The height error signal controlled the gain is supplied to an actuator 2 controlling the distance with respect to the disk of a magnetic circuit Mg through a driving amplifier 30.

公开(公告)号：JPH04372748A

公开(公告)日：1992-12-25

申请号：JP17742491

申请日：1991-06-21

Applicant: SONY CORP

Inventor： HORIGOME HIDEYOSHI ,  FUJITA GORO

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To reduce the fluctuation of a time base and to attain a high density recording by recording a recording pit to be recorded in a magneto-optical recording medium at an exact position. CONSTITUTION:A magneto-optical recording layer is provided on the substrate of the magneto-optical recording medium, and an isolated area 2 being the obstacle to the recording is provided at a prescribed interval in the recording direction of the magneto-optical recording layer, that is, a track direction, so that a recording pit cell can be prepared in the tracking direction, and the signal can be recorded by using the recording pit cell as a unit.

公开(公告)号：JPH04372739A

公开(公告)日：1992-12-25

申请号：JP17742891

申请日：1991-06-21

Applicant: SONY CORP

Inventor： FUJITA GORO

IPC: G11B7/007 ,  G11B7/095 ,  G11B7/26

Abstract: PURPOSE:To attain the recording and reproduction of exact information by recording tracking sensitivity information in a disk as one piece of TOC information and reading the TOC information in order to control a suitable tracking. CONSTITUTION:A CPU 7 decides whether or not the information concerning to the gain of a tracking servo is present in the read TOC information. When the gain information of the tracking servo is not present, the tracking sensitivity is measured at the inner periphery and outer periphery of a disk 1, and the information of the tracking sensitivity obtained after the measurement is recorded in the disk 1 as the TOC information. That is, the CPU 7 moves a head 2 through a servo circuit 4 to the prescribed position of the inner periphery of the disk 1. Then, the tracking servo is turned OFF at the position, so that the optical tracking can be controlled, and the recording or reproduction of the exact information can be operated.

公开(公告)号：JPH04283442A

公开(公告)日：1992-10-08

申请号：JP7251191

申请日：1991-03-12

Applicant: SONY CORP

Inventor： FUJITA GORO ,  WATANABE SATORU

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To protect parts or the like from the heat of a magnetic head provided at a magneto-optical disk device. CONSTITUTION:A bobbin 12 holding a driving coil 11 is equipped with many radiating fins 17. The head of a magnetic head 15 is transmitted to the bobbin 12, and radiated from the radiating fins 17. Therefore, the rising of the temperature of the magnetic head 15 can be suppressed, and the influence of the heat on the surrounding parts(optical sensor 16 or the like) can be reduced.

公开(公告)号：JPH04276338A

公开(公告)日：1992-10-01

申请号：JP6264891

申请日：1991-03-04

Applicant: SONY CORP

Inventor： FUJITA GORO

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To offer a magnetic field coil position controller which can be used without reducing the light emitting light quantity even when an ambient temperature rises. CONSTITUTION:A pulse-shaped timing signal generated from a timing circuit 10 is supplied through a light emitting element driving circuit 11 to a light emitting element 5, thus, the power consumption the light emitting element 5 is decreased, and when the ambient temperature rises, the controller can be used without decreasing the light emitting light quantity.

公开(公告)号：JPH04184738A

公开(公告)日：1992-07-01

申请号：JP31558190

申请日：1990-11-20

Applicant: SONY CORP

Inventor： FUJITA GORO ,  KAWASHIMA TETSUJI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To lower power consumption, and to reduce the effect of heat generation by intermittently driving laser beams while being synchronized with the timing of a reference clock and irradiating a magneto-optic disc with laser beams while intermittently applying a magnetic field to the magneto-optical disc as being synchronized with the driving timing of laser beams. CONSTITUTION:Laser beams are driven intermittently while the temperature of a magneto-optical disc 1 is elevated to a Curie temperature or higher by the irradiation of laser beams, and a magnetic field is applied from head coils 32 and 33 only for a period when data can be recorded. When the temperature of the magneto-optical disc 1 is lowered to the Curie temperature or lower, currents are not made to flow through the head coils 32 and 33. Accordingly, currents are made to flow through the head coils 32, 33, thus reducing power consumption.

公开(公告)号：JPH04137260A

公开(公告)日：1992-05-12

申请号：JP25702890

申请日：1990-09-28

Applicant: SONY CORP

Inventor： OMORI KIYOSHI ,  WACHI SHIGEAKI ,  FUJITA GORO

IPC: G11B33/14 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0055 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B19/02 ,  G11B19/04

Abstract: PURPOSE:To enable a stable recording, reproducing and erasing of information signals by providing a temperature detecting sensor which comes in contact with a cartridge and detects the temperature of the cartridge and, based on the detection result, controling the most suitable laser power. CONSTITUTION:The temperature detecting sensor 20 which comes in contact with the cartridge 2 and detects the temperature of the cartridge 2 is provided on a chasis 6. A laser beam in connection with this is controlled at a central processing device 21 based on the temperature of the cartridge 2 detected by the temperature detecting sensor 20 which is in contact with the disk cartridge 2, viz., based on approximately the same temperature as that of the disk 1 and is outputted as the most suitable power for recording. Consequently, according to the accurate temperature detection result of the recording medium 1, the write and read operation of the information signals are performed under the most suitable conditions.

公开(公告)号：JPH0478001A

公开(公告)日：1992-03-12

申请号：JP18404090

申请日：1990-07-13

Applicant: SONY CORP

Inventor： FUJITA GORO ,  SEO KATSUHIRO

IPC: G11B11/10 ,  G11B5/02 ,  G11B11/105

Abstract: PURPOSE:To precisely detect distance to a disk surface, and to reduce power consumption by arranging a light source and a light receiving part respectively through an optical fiber, and detecting the distance between an external magnetic field generating part and the disk surface by receiving reflected light from the disk surface. CONSTITUTION:One end side of the optical fiber 16 is fitted to the external magnetic field generating part 11, and the light from a light source 12 irradiates the part 11 through the optical fiber 16, and the distance between the external magnetic field generating part 11 and the disk surface is detected by receiving the reflected light from the disk surface of this light by the light receiving part 13. Accordingly, the light source 12 is never influenced by heat generated by the external magnetic field generating part 11. Thus, highly precise position detection can be realized, and the external magnetic field generating part 11 can be arranged sufficiently close to the disk surface of magneto-optical disk 3, and the magnetic field of prescribed intensity can be impressed to the magneto-optical disk 3 by low power consumption.

公开(公告)号：JP2014127651A

公开(公告)日：2014-07-07

申请号：JP2012285027

申请日：2012-12-27

Applicant: Sony Corp ,  ソニー株式会社

Inventor： FUJITA GORO ,  OKA MICHIO ,  YOSHIDA HIROSHI ,  MAEDA FUMISADA ,  UEDA MITSUNORI ,  TANAKA KENJI

IPC: H01S5/14

CPC classification number: H01S5/141 ,  H01S3/1055 ,  H01S5/0064 ,  H01S5/02248 ,  H01S5/0265 ,  H01S5/0267 ,  H01S5/028 ,  H01S5/0657 ,  H01S5/4006 ,  H01S5/50 ,  H01S2301/02

Abstract: PROBLEM TO BE SOLVED: To enable obtaining a more stable output.SOLUTION: A laser emitting device includes a semiconductor laser for emitting light having a prescribed wavelength, a grating which is provided at the latter part of the semiconductor laser while forming a resonance structure between itself and the semiconductor laser by reflecting emitted light from the semiconductor laser, and from which a part of the emitted light is taken out to the outside as output light, and at least one cylindrical lens provided between the semiconductor laser and the grating so that the light emitting surface of the semiconductor laser and the reflection surface of the grating serve as a confocal.

Abstract translation: 要解决的问题：能够获得更稳定的输出。解决方案：激光发射装置包括用于发射具有规定波长的光的半导体激光器，设置在半导体激光器的后半部分的光栅，同时形成谐振结构 其自身和半导体激光器通过反射来自半导体激光器的发射光，并且将一部分发射的光从该半导体激光器中取出到外部作为输出光，以及至少一个柱面透镜，设置在半导体激光器和光栅之间，使得 半导体激光器的发光表面和光栅的反射表面用作共焦。

公开(公告)号：JP2013149304A

公开(公告)日：2013-08-01

申请号：JP2012006748

申请日：2012-01-17

Applicant: Sony Corp ,  ソニー株式会社

Inventor： FUJITA GORO ,  MARUYAMA TSUTOMU

IPC: G11B7/1267 ,  G11B7/0045 ,  G11B7/1263

Abstract: PROBLEM TO BE SOLVED: To provide a recorder able to easily obtain pulse light of a predetermined frequency and pulse energy by a simple configuration, and to provide a driving method thereof.SOLUTION: Pulse energy required for recording is selected from a driving condition table holding driving conditions composed of gain currents Igain for driving a self-oscillation semiconductor laser 1 at a target frequency, negative bias voltages Vsa, and pulse energy. A gain current Igain and bias voltage Vsa corresponding to the selected pulse energy are supplied to the self-oscillation semiconductor laser 1, and also a clock synchronization signal of a predetermined frequency is injected into the bias voltage Vsa. Thus, pulse light of the predetermined frequency and pulse energy is generated from the self-oscillation semiconductor laser 1.

Abstract translation: 要解决的问题：提供一种能够通过简单的结构容易地获得预定频率和脉冲能量的脉冲光的记录器，并提供其驱动方法。解决方案：记录所需的脉冲能量选自保持 由用于驱动目标频率下的自激振荡半导体激光器1的增益电流Igain，负偏压Vsa和脉冲能量组成的驱动条件。 将与选择的脉冲能量对应的增益电流Igain和偏置电压Vsa提供给自激振荡半导体激光器1，并将预定频率的时钟同步信号注入偏置电压Vsa。 因此，从自激半导体激光器1产生预定频率的脉冲光和脉冲能量。