公开(公告)号：ID24986A

公开(公告)日：2000-09-07

申请号：ID20000158

申请日：2000-03-02

Applicant: SONY CORP

Inventor： FUJIIE KAZUHIKO ,  NETSU NAOHIRO ,  KODA TOMOHIRO

IPC: G11B5/02 ,  G11B5/127 ,  G11B5/60 ,  G11B11/10 ,  G11B11/105

Abstract: A magnetic head device comprising a head section 55 for applying a magnetic field to a disk. The head section 55 includes a magnetic field generating section 61 and a slider 62. The slider 62 supports the magnetic field generating section 61 and may be set in sliding contact with the disk. The magnetic field generating section 61 has a magnetic core 63 and a coil 64 wound around the magnetic core 63. The section 61 is designed to generate the magnetic field and embedded in and formed integral with the slider 62. The head section 55 excels in heat-radiating property.

公开(公告)号：DE10009873A1

公开(公告)日：2000-09-07

申请号：DE10009873

申请日：2000-03-01

Applicant: SONY CORP

Inventor： FUJIIE KAZUHIKO ,  NETSU NAOHIRO ,  KODA TOMOHIRO

IPC: G11B5/02 ,  G11B5/127 ,  G11B5/60 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04

Abstract: The magnetic head device has a head part for applying a magnetic field to a plate, whereby the head part has a magnetic field generating part and a sliding element supporting the field generating part that slides in contact with the plate. The field generating part (61) has a coil (63) wound around a magnetic core (64) and embedded in the sliding element (62) and hence made in one piece with it. An Independent claim is also included for a recording/reproduction device.

公开(公告)号：JPH10334535A

公开(公告)日：1998-12-18

申请号：JP14552297

申请日：1997-06-03

Applicant: SONY CORP

Inventor： NAGASHIMA TOSHIRO ,  KODA TOMOHIRO

IPC: G11B20/14 ,  G11B7/00 ,  G11B7/005 ,  G11B11/10 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To correct the phase deviation of a reproducing clock signal in a data area on demand. SOLUTION: The clock signal CKL synchronized with clock pits of a disk 11 is generated in a PLL(phase-locked loop) circuit 52 and plural clock signals CK1-CKm are obtained by successively delaying the clock signal CKL every fixed time in a phase delaying circuit 53. After the reproduced signal SMO of the data area of the disk 11 is subjected o the waveform equalizing processing of a PR(partial response), it is converted into a digital signal by using a reproducing clock signal WCK in an A/D converter 42. Signal sampled values yn being output data of the coverter 42 are supplied to a phase deviation detecting circuit 55 and the phase deviation value Δτn from the optimum reproducing clock signal of the clock signal WCK is detected from the signal sampled values and ternary data decision values. Then, the reproducing clock signal WCK synchronized with the reproduced signal SMO by controlling the tacking out of a clock signal in a clock selection circuit 54 so that the phase deviation value Δτn becomes zero.

公开(公告)号：JPH0836799A

公开(公告)日：1996-02-06

申请号：JP17058294

申请日：1994-07-22

Applicant: SONY CORP

Inventor： OMORI KIYOSHI ,  AOKI SUNAO ,  KODA TOMOHIRO

IPC: G11B21/21 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To enlarge the recording area of a magneto-optical disk. CONSTITUTION:In a state wherein a slider 6 is made eccentric so that a length L2 from a border line B1 to one side 6b thereof be longer than a length L1 to the other side 6a when the radial direction of a magneto-optical disk 101 is made to be the border line B1, the slider 6 is fitted to the fore end of a flecture 5. The slider 6 is provided with a magnetic field generating part 7 which moves in the radial direction of the magneto-optical disk 101 and an external magnetic field is impressed on the disk. The front side 6c of the slider 6 in the direction of movement thereof being opposed to a ring-shaped protuberant part 106 in the outer circumference of the magneto-optical disk 101 is formed to have a circular-arc face to the center of rotation of the magneto- optical disk 101. The circular-arc face is formed to have a radius R2 of curvature being smaller than the radius R1 of curvature of the ring-shaped protuberant part 106.

公开(公告)号：JPH064924A

公开(公告)日：1994-01-14

申请号：JP18615192

申请日：1992-06-19

Applicant: SONY CORP

Inventor： WATANABE SATORU ,  KODA TOMOHIRO

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To reduce the influence of external magnetic field and to relieve the load of a magnetic head by setting the magnetizational direction of the initialization of an entire disk or a guard band in the same direction as the direction of the leakage magnetic field of an electromagnetic actuator. CONSTITUTION:By a magnetic field direction control part, the direction (the arrow B) of the leakage magnetic field from an optical actuator is detected and the direction of the leakage magnetic field (the arrow B) is set in the direction where a magneto-optical disk is initialized. By such a constitution, the direction (the arrow D) of the strength of the magnetic field performing magnetic field inversion recording to a required pit is made to coincide with the direction (the arrow C) of stray magnetic field in the pit. Similarly, the polarization, as well of the guard band GB provided on the boundary of the recording area Rs of the magneto-optical disk is made the polarization N of the same direction as the leakage magnetic field and initialized. Thus, the influence due to the guard band GB of a required recording position is reduced.

公开(公告)号：JPH05307780A

公开(公告)日：1993-11-19

申请号：JP13429192

申请日：1992-04-27

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To provide a magneto-optical recording medium which increases the perpendicular component of a magnetic field applied by a magnetic head in the area to be irradiated with light, reduced electric power consumed by the head and the amt. of heat generated by the head and enhances reliability. CONSTITUTION:A dielectric film 31, a recording film 32, a high permeability layer 35 and a protective layer 4 are successively laminated on a transparent substrate 1 or a photosetting resin layer 2, a first dielectric film 31, a recording film 32, a second dielectric film 33, a high permeability layer 35 and a protective layer 4 are successively laminated on the substrate 1. Light passing through the recording film 32 or the second dielectric film 33 is reflected by the high permeability layer 35 to accelerate multiplex interference and the perpendicular component of a magnetic field is increased in the area to be irradiated with laser light.

公开(公告)号：JPH05303752A

公开(公告)日：1993-11-16

申请号：JP12993292

申请日：1992-04-24

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B7/085 ,  G11B7/09

Abstract: PURPOSE:To effectively focusing control by setting the driving current of a focus actuator to a large value till the focal point of a laser beam arrives at the surface of an optical disk, reducing the driving current after arriving at the optical disk surface, executing focusing on the recording surface of the optical disk and ending the leading-in of the focus. CONSTITUTION:The driving current I1 is supplied to the focus actuator 45 from a power amplifier 11. Then an objective lens 44 is approached to the optical disk 1 surface at a speed corresponding to the current I1 by the actuator 45. Then, when the focal point of the laser beam arrives at the surface 1s of the optical disk 1, the large value I1 of the driving current of the focus actuator 45 is reduced in speed. Then, by reducing a searching speed till the beam focuses on the recording surface of the optical disk 1 and the leading-in of focus is ended, the occurrence of overshoot, etc., is prevented and the leading-in of the focus operation is executed stably in a short time.

公开(公告)号：JP2003338130A

公开(公告)日：2003-11-28

申请号：JP2002142714

申请日：2002-05-17

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HORIKAWA SHUJI ,  KODA TOMOHIRO ,  TAKAI MOTOYUKI

IPC: G06F12/08 ,  G06F12/12 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To make an efficient write/read operation and the responsiveness for a disk compatible with each other. SOLUTION: When the information temporarily stored in a cash memory is written to a recording medium (disk) and/or the information read from the disk is stored into the cash memory, it is made so that disk writing about the information stored in the cash memory or disk reading of the information to be stored in the cash memory is directed with the minimum data length and period capable of continuous write/read of the information to the disk and, in accordance with the direction, the execution of the write/read operation of the information to the disk is controlled. Thereby, the disk writing/disk reading are made possible to be performed as a continuous operation which continues in accordance with plural times of directions, that is, such an operation that the write/read trace to a track of the disk is not interrupted by the track access. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：进行有效的写入/读取操作和对于兼容的磁盘的响应性。 解决方案：当临时存储在现金存储器中的信息被写入记录介质（磁盘）和/或从磁盘读取的信息被存储到现金存储器中时，使得关于所存储的信息的磁盘写入 存储在现金存储器中的现金存储器或磁盘读取将以存储在现金存储器中的信息的最小数据长度和周期指示，该数据长度和周期能够将信息连续写入/读取到盘，并且根据该方向执行 将信息的写入/读取操作控制到磁盘。 由此，能够进行磁盘写入/读取，作为连续的动作，该连续动作按照多个方向继续进行，即，对磁盘的磁道的写入/读取轨迹不被中断的操作 轨道通道。 版权所有（C）2004，JPO

公开(公告)号：JP2003330798A

公开(公告)日：2003-11-21

申请号：JP2002142713

申请日：2002-05-17

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HORIKAWA SHUJI ,  KODA TOMOHIRO ,  TAKAI MOTOYUKI

IPC: G06F12/08 ,  G06F3/06 ,  G06F12/12 ,  G11B20/10 ,  H04N5/85 ,  H04N5/91

Abstract: PROBLEM TO BE SOLVED: To improve the cache responsiveness by an efficient flash processing. SOLUTION: According to the attribute of information stored in a cache memory (temporary storage means), the operation of reading information temporarily stored in the temporary storage means and writing it in the storage medium, that is, flash operation is controlled. Particularly, flash processing is started preferentially from data having a shorter flash processing time, or in order of continuous data, noncontinuous data, and blocking necessary data. Many data-writable empty spaces are formed in the cache memory in its early stages as much as possible by such a control to improve the cache responsiveness rate. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：通过有效的闪存处理来提高缓存响应能力。 解决方案：根据存储在高速缓冲存储器（临时存储装置）中的信息的属性，控制临时存储在临时存储装置中并将其写入存储介质，即闪存操作的信息的操作。 特别地，闪存处理优先地从具有较短的闪存处理时间的数据或连续数据，非连续数据和阻塞所需数据的顺序开始。 通过这种控制来尽可能多地在高速缓冲存储器的早期阶段形成许多数据可写空白空间，以提高高速缓存响应速率。 版权所有（C）2004，JPO

公开(公告)号：JP2002319102A

公开(公告)日：2002-10-31

申请号：JP2001120510

申请日：2001-04-19

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B5/09 ,  G11B5/02 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To suppress the power consumption by the simple constitution when the drive is changed over to the low frequency driving. SOLUTION: Switching elements Q2, Q4, Q5, Q6 consist of the enhancement type N-channel FETs, and switching elements Q1, Q3 consist of the enhancement type P-channel FETs. When the high frequency driving current is supplied to a coil L, each group of the switching elements Q1, Q4 and the switching elements Q2, Q3 is alternately turned on/off. Meanwhile, when the low frequency driving current is supplied to the coil L, each group of the switching elements Q4, Q5 and the switching elements Q2, Q6 is alternately turned on/off, and since an impedance of the coil L is low and a voltage between both ends is low in this case, the power consumption is reduced by lowering the power source voltage. Since the switching elements Q5, Q6 are the N-channel FETs, the application of the negative gate voltage is unnecessary even though the power source voltage is lowered.