公开(公告)号：JP2000260029A

公开(公告)日：2000-09-22

申请号：JP6195799

申请日：1999-03-09

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B19/20 ,  G11B7/00 ,  G11B7/005 ,  G11B7/09 ,  G11B19/02

Abstract: PROBLEM TO BE SOLVED: To provide a speech noise reducing unit capable of reducing a speech noise caused by an unbalanced abnormal vibration generated corresponding to rotation of an optical disk. SOLUTION: This speech noise reducing unit reduces a speech noise caused by a mechanical vibration by the rotation of an optical disk medium 10, because an I-V matrix circuit 18 detects a wavy disorder part of a tracking error signal according to the rotational cycle of the optical disk medium 10, and when the duration of the wavy disorder part is longer than a prescribed time and the cycle period matches with the rotation cycle of the optical disk medium 10, a system control unit 7 judges that a speech noise is generated due to an abnormal vibration by deflection swinging of the optical disk medium 10, and when the duration of the wavy disorder part is larger than that of the maximum defect part smaller than the rotation cycle of the optical disk medium 10, the noise is judged as speech noise generation judged excluding an influence by defects of a recording film, and the system control unit 7 provides the speech signal with decreasing processing by a level amount provided with a positive correlation with the disordered amplitude for the duration.

公开(公告)号：JP2000040273A

公开(公告)日：2000-02-08

申请号：JP20543598

申请日：1998-07-21

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B11/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To enable a magneto-optical recording device to perform a high transfer rate recording by always maintaining the optimum recording conditions, regardless of temperature fluctuation, the change with time of the device, and difference in the characteristics of a recording medium, in a magneto-optical recorder of what is called a laser strobe magnetic field modulated recording method. SOLUTION: A test signal is recorded on a recording medium by varying (1, 2, 3,...9) the time phase of a laser pulse and a modulated magnetic field; then, the test signal is reproduced, with the jitter measured of the reproduced signal, and the time phase in which the jitter is smallest is used as the optimum phase and set in the recording device for the purpose of data recording thereafter.

公开(公告)号：JP2000011524A

公开(公告)日：2000-01-14

申请号：JP17008798

申请日：1998-06-17

Applicant: SONY CORP

Inventor： NAKAO SHINICHI ,  KODA TOMOHIRO

IPC: G11B20/10 ,  G11B7/00 ,  G11B7/004 ,  G11B19/04 ,  G11B19/247 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To obtain an optical information recording and reproducing device and an optical information recording and reproducing method realizing a high transfer rate with high access by performing a recording and a reproduction with a CAV(constant angular velocity) system with respect to the optical disk of a CLV(constant linear velocity) system. SOLUTION: An optical information recording and reproducing device is provided with a recording clock generating circuit 9 generating recording clocks based rotational information at the time an optical disk 1 is revolved by a spindle motor 2 in a condition in which an angular velocity is constant at the time of recording, an optical pickup 3 performing the recording of optical information data with the generated recording clocks, the optical pickup 3 performing the reproducing of the optical information recorded on an optical recording medium at the time of reproduction and an ADIP address detecting circuit 5 detecting reproduced clock frequencies. Thus, the device can perform the recording and the reproducing of the optical information data of high access and the high transfer rate.

公开(公告)号：JP2003338131A

公开(公告)日：2003-11-28

申请号：JP2002142715

申请日：2002-05-17

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HORIKAWA SHUJI ,  KODA TOMOHIRO ,  TAKAI MOTOYUKI

IPC: G06F12/00 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To efficiently read a disk. SOLUTION: When information to be read from the disk are temporarily stored in a cache memory in response to a plurality of times of reading requests to the cache memory, separated situations in the disk among the plurality of pieces of information to be read from the disk in response to the requests are detected. For example, whether a difference between addresses in the disk is not more than a prescribed value or not is detected. When the plurality of pieces of information are physically separated a little, reading is performed from the disk by one continuous reading trace including unnecessary data in the separated part. That is, the plurality of necessary pieces of information are read as an operation by which the reading trace with respect to the track of a disk recording medium is not interrupted by track access. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：有效读取磁盘。 解决方案：响应于对高速缓冲存储器的多次读取请求而将要从盘读取的信息临时存储在高速缓冲存储器中，在待读取的多条信息中的盘中的分离情况 从磁盘响应请求被检测到。 例如，检测到盘中地址之间的差是否在规定值以下。 当多条信息在物理上分开时，通过包括分离部分中不必要的数据的一连续读取轨迹从盘执行读取。 也就是说，将多条必要的信息作为操作，通过该操作，相对于磁盘记录介质的磁道的读取轨迹不被磁道访问中断。 版权所有（C）2004，JPO

公开(公告)号：JP2003330796A

公开(公告)日：2003-11-21

申请号：JP2002141021

申请日：2002-05-16

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HORIKAWA SHUJI ,  KODA TOMOHIRO ,  TAKAI MOTOYUKI

IPC: G06F12/08 ,  G06F3/06 ,  G11B20/10 ,  H04N5/765 ,  H04N5/85 ,  H04N5/92

Abstract: PROBLEM TO BE SOLVED: To realize a cache system adaptable to both PC data and AV data. SOLUTION: A cache memory (temporary storage means) is divided for every N pieces of cells (in a prescribed unit). For the data to be read and written to a disc, the write-in to the cache memory is performed from the position corresponding to the remainder of the division of an address on the disc by a prescribed number N. According to this, a cache memory control ensured in the continuity of continuous data on the cache memory and enhanced in retrieval speed can be realized. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：实现适用于PC数据和AV数据的缓存系统。 解决方案：每N个单元（以规定的单位）划分缓存存储器（临时存储装置）。 对于要读取和写入盘的数据，从对应于盘上的地址的剩余部分的位置执行对高速缓冲存储器的写入规定数量N.据此，缓存 存储器控制确保了高速缓冲存储器上的连续数据的连续性，并且可以实现增强的检索速度。 版权所有（C）2004，JPO

公开(公告)号：JP2001256765A

公开(公告)日：2001-09-21

申请号：JP2000072534

申请日：2000-03-15

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: H04N5/781 ,  G11B19/02 ,  G11B19/28 ,  G11B20/10 ,  G11B21/08 ,  G11B27/10 ,  H04N5/85

Abstract: PROBLEM TO BE SOLVED: To provide a recording and reproducing device capable of recording or reproducing information with high quality without making noise of a mechanism part during recording or reproducing operation. SOLUTION: The recording and reproducing device comprises a movable time estimation part 9 for estimating a stand still period of recording on a recording medium 2 based on the difference between the speed for writing main data in a data buffer 10 and that for reading recorded data from the data buffer 10, a moving amount calculating part 7 and a moving speed calculating part 8 which calculate a control signal value for moving the recording and reproducing head 1 to a recording position away from the present position by a thread driving part 4 during the stand still period, and a system control part 5 for moving the recording and reproducing head 1 to the recording position by the thread driving part 4 over the estimated stand still period based on the control signal value calculated during the stand still time of recording the data on the recording medium 2.

公开(公告)号：JPH10199060A

公开(公告)日：1998-07-31

申请号：JP1596897

申请日：1997-01-14

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

IPC: G11B11/10 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To easily and exactly control laser power by temp. change. SOLUTION: Test data are written in a test area by, for instance, laser power PB as an adjusting value for the previous test, and then the written test data are read out (S001-S004). Now, a regenerative signal position Xc is detected from the test data by a positional shift detecting part (S005), and is supplied as a dislocation signal to a controller. In the controller, a laser power changing quantity ΔP=f(Xc-X'c) is calculated from the regenerative signal position Xc and a stored regenerative signal position X'c (S006), and laser power PN=PB+ΔP obtained in the writing test this time is set as the laser power for performing an actual writing operation.

公开(公告)号：JPH08106774A

公开(公告)日：1996-04-23

申请号：JP17705995

申请日：1995-07-13

Applicant: SONY CORP

Inventor： KODA TOMOHIRO ,  OMORI KIYOSHI

IPC: G11B33/14 ,  G11B7/00 ,  G11B7/004 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE: To enable a producing of a temperature detection means of a disc cassette at a lower cost while eliminating the need to consider the laying of cables. CONSTITUTION: A cassette holder 2 and a spindle lifting/lowering plate body 3 move upward or downward independently and an elastic deformation part 121a is made up of a flexible substrate 121 arranged on the spindle lifting/ lowering plate body 3. A temperature sensor S5 is fixed in such a manner that it does not contact a disc cassette DK in a cassette waiting state by on the elastic deformation part 121a and presses onto the disc cassette DK in a cassette loaded stated.

公开(公告)号：JPH0836798A

公开(公告)日：1996-02-06

申请号：JP17058194

申请日：1994-07-22

Applicant: SONY CORP

Inventor： OMORI KIYOSHI ,  AOKI SUNAO ,  KODA TOMOHIRO

IPC: G11B11/10 ,  G11B5/02 ,  G11B11/105 ,  G11B21/21

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 impresses an external magnetic field on the disk. The slider 6 is fitted to the flecture 5 so that the front and rear sides 6c and 6d thereof in the direction of movement of a carriage have a prescribed tilt angle theta2 to the direction intersecting the direction of movement of the carriage perpendicularly so that the side 6b may separate from a protuberant part 106 in the outer circumference of the magneto-optical disk 101 and that the side 6b may approach the part 106, when the slider 6 is moved toward the protuberant part 106.

公开(公告)号：JPH0676402A

公开(公告)日：1994-03-18

申请号：JP22753992

申请日：1992-08-26

Applicant: SONY CORP

Inventor： KODA TOMOHIRO

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

Abstract: PURPOSE:To save the power consumption of a coil driving circuit by adding two switching means to a constant current source route and performing the control of these switching elements in accordance with the combined patterns of continuous recording column data. CONSTITUTION:Switching means 21 and 22 are connected with auxiliary coils 18 and 19. By the control of a controller 2, the ON/OFF controls of the switching elements 21, 22 are performed in accordance with the combined patterns of continuous recording column data. Thus, energy is stored in the inductance L3 (L2) of the auxiliary coil 19 (18), counter electromotive force is generated when a switching element 15 (14) is turned off and the switching from current I1 (I2) to I2 (I1) can be quickly performed. Therefore, current I'2, I'1 flowing in the coils 18, 19 is minimized, power consumption is reduced and the switching of sufficient exciting current can be performed in modulation pulse data of short width caused by counter electromotive force.