公开(公告)号：JP2000030417A

公开(公告)日：2000-01-28

申请号：JP19899598

申请日：1998-07-14

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  TADOKORO EIJI

IPC: G11B27/34 ,  G11B17/22 ,  G11B19/02 ,  G11B27/02 ,  G11B27/034 ,  G11B27/10

Abstract: PROBLEM TO BE SOLVED: To rapidly reproduce a record medium requested from a user even at a device initialization time by storing the top part data on the requested recording medium in a sub-storage means when the user requests the reproduction of the specified recording medium at the device initialization time, storing the data after the top part data in a main storage means and reproducing the requested recording medium. SOLUTION: At the device initialization time, when the user requests the MD 1a as the specified MD, a system controller 11 controls a stage controller 33 and a loading controller 34, etc., and loads the MD 1a on a player box 32, and reads the top part data of the MD 1a to store them in a top part area of a RAM 12. Thereafter, the system controller 11 reads out the top part data from the RAM 12 to start to reproduce them, and succeedingly, stores the data after the top part data in the main memory area of the RAM 12. Thus, at the device initialization time, the MD 1a requested by the user is reproduced rapidly and continuously from the top part without breaking a sound.

公开(公告)号：JPH11162036A

公开(公告)日：1999-06-18

申请号：JP32828997

申请日：1997-11-28

Applicant: SONY CORP

Inventor： OMORI TAKASHI

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

Abstract: PROBLEM TO BE SOLVED: To enable high speed recording with a sufficient margin in an attitude error even when a variety of fluctuation factors are caused by generating a control pulse for respective switching elements of a magnetic head drive means based on the encoded data and making the width of the control pulse for the switching element connected to a power source a specified length answering to the inversion of the encoded data. SOLUTION: The widths of the control pulses Sig 3 and Sig 4 for the switching element functioning at a magnetic field inversion operation are made less than 1/2 of a unit time. A clock frequency variable part 21 N multiplies a clock frequency from a clock generation part 20, and generates a clock of a high speed rate of 1/N. A regular rate clock from the clock generation part 20 and the high speed rate clock from the variable part 21 are selected by switching operation of a switch 22 according to a switch signal Sel from a system controller 11 to be supplied to an encoder 14 and a control signal generation circuit 15 as a processing clock CK. A change in a head current is steepened.

公开(公告)号：JPH11144263A

公开(公告)日：1999-05-28

申请号：JP31072897

申请日：1997-11-12

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  TADOKORO EIJI

IPC: G11B7/085 ,  G11B7/09

Abstract: PROBLEM TO BE SOLVED: To provide an optical disk device capable of stable tracking and stable track jump at a high speed revolution. SOLUTION: Two servo filters 11, 12 are provided in the optical disk device, and either one side between them is connected to a control circuit 14 by a changeover switch 13. The gain |G1 | of the servo filter 11 at a disk rotational frequency (f0 ) is set larger than the gain |G2 | of the servo filter 12, and the servo filter 11 of a large gain is connected in regular tracking, and the servo filter 12 of a small gain is connected in the track jump. After the track jump, the servo filter 11 is connected again, and returnes to regular tracking.

公开(公告)号：JPH1069602A

公开(公告)日：1998-03-10

申请号：JP17468297

申请日：1997-06-30

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  FUJISAWA HIROTOSHI

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

Abstract: PROBLEM TO BE SOLVED: To precisely apply a magnetic head to a position irradiated with a light beam by precisely moving and operating the magnetic head and an optical pickup arranged oppositely to each other holding a magneto-optical disk in-between synchronized with each other. SOLUTION: This recorder using the magneto-optical disk 1 is provided with the optical pickup 8 and the magnetic head 12 arranged on the position opposing to each other holding the magneto-optical disk 1 rotated by a disk rotation drive mechanism 7 between them. Then, the magnetic head 12 is connected to the optical pickup device 8 through supporting members 11a, 11b consisting of metallic plate, and is moved and operated in the radial direction of the magneto-optical disk 1 synchronized with the optical pickup device 8. Further, the magnetic head 12 is attached/detached to/from the magneto-optical disk 1 interlocked with turning movement of a cap 2b.

公开(公告)号：JPH1064182A

公开(公告)日：1998-03-06

申请号：JP21824696

申请日：1996-08-20

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  TADOKORO EIJI

IPC: G11B19/28 ,  G11B19/247

Abstract: PROBLEM TO BE SOLVED: To exactly discriminate the polarity of an error voltage to perform rotational control on a disk. SOLUTION: The error voltage comprising a large amt. of variation due to noise is impressed upon an LPF 31, and a high frequency component due to noise is removed. Then, the error voltage to be supplied via the LPF 31 and a voltage at a reference level, for example, zero level are supplied to a comparator 32. These two voltages are compared with each other in size by the comparator 32 to output a signal showing the polarity corresponding to a result of the comparison. Thus, by removing the high frequency component comprised in the error voltage to be supplied to the comparator 32 by means of the LPF 31, a polarity signal in good quality with reduced variation caused by noise can be obtained.

公开(公告)号：JPH08167191A

公开(公告)日：1996-06-25

申请号：JP33038594

申请日：1994-12-07

Applicant: SONY CORP

Inventor： OMORI TAKASHI

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

Abstract: PURPOSE: To make possible the magnetic field impression operation at a highspeed rate by providing the above recorder with a control signal forming means constituted to output a control signal after lapse of the time enough for the terminals of a coil to attain a prescribed voltage. CONSTITUTION: An optical head 3 for irradiating a disk 1 with a laser beam at the time of recording/reproducing outputs the laser of a high level for heating recording tracks up to a Curie temp. at the time of recording and outputs the laser of a relatively low level for detecting data from the reflected light by a magnetic Kerr effect at the time of reproducing. An optical system consisting of a laser diode as a laser output means, a polarization beam splitter, an objective lens 3a, etc., and a detector for detecting the reflected light are, therefore, mounted on the optical head 3. The objective lens 3a is made displaceable in the radial direction of the disk and in a direction where the lens attaches and detaches to and from the disk 1 by a biaxial mechanism 4. The entire part of the optical head 3 is made movable in the radial direction of the disk by a threading mechanism 5.

公开(公告)号：JPH07254220A

公开(公告)日：1995-10-03

申请号：JP4420094

申请日：1994-03-15

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  SANADA SHINJI ,  MATSUMOTO HIDEKI

IPC: G11B20/10 ,  G11B11/10 ,  G11B11/105 ,  G11B19/02 ,  G11B19/28

Abstract: PURPOSE:To enhance the recording and retrieving speeds of files by performing the recording and reproduction of information at a transfer speed corresponding to the rotating speed of a disk for the magneto-optical disk, which is rotated and controlled. CONSTITUTION:In a drive/optical pickup part 14, an optical pickup comprising a laser diode LD 53, a photodetector PD 52 and the like, and a magnetic-field modulating coil 51 as a magnetic-field generator are controlled at the same time. Thus, the compressed data or the non-compressed binary data are recorded on a disk 15. The detected signal from the PD 52 is sent into a signal processing circuit 62. At the time of recording into the disk 15, various kinds of servo signals are obtained. At the time of reproduction the servo signal is obtained, and a reading signal is obtained at the same time. The circuit 62 performs the control, by which the laser power of the LD 53 is made to be specified times in comparison with that in the linear velocity of a standard specification at the time of data recording into the disk 15. The circuit 62 obtains the servo signal and the reading signal by using the PD detected signal from the disk 15, which is rotated at the linear velocity from, e.g. 2.4m/s to 2.8 m/s.

公开(公告)号：JPH06162672A

公开(公告)日：1994-06-10

申请号：JP33971392

申请日：1992-11-25

Applicant: SONY CORP

Inventor： OMORI TAKASHI

IPC: G11B20/12

Abstract: PURPOSE:To protect and reproduce important data even if a burst error section fluctuates at a connection recording part by writing the head data of main data in multiples for each specific amount of data to be recorded in connection. CONSTITUTION:An audio signal is input to an input terminal 31 on recording. The signal is compressed by an audio compression encoder/decoder circuit 33 through an A/D converter 32 and is temporarily stored at a buffer memory 35 under the control of a memory controller 34. On the other hand, sub data information is input to a sub-data encoder 51 and the sub-data blocks for 32 frames are generated and are sent to a multi-writing circuit 52. The circuit 52 outputs the same sub-data blocks to the controller 34 for three times continuously. The controller 34 temporarily stores the sub data at a predetermined sub-data area of the memory 35 and transmits the sub data which are triply written are sent to a circuit 36 when transferring data for one class and a head drive circuit 38 records the data via a circuit 37.

公开(公告)号：JPH06131607A

公开(公告)日：1994-05-13

申请号：JP27621592

申请日：1992-10-14

Applicant: SONY CORP

Inventor： OMORI TAKASHI ,  YANO HAJIME ,  FUJIIE KAZUHIKO

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

Abstract: PURPOSE:To relieve the influence of a magnetic field relating to a magnetic head by arranging an electromagnetic shield member in the vicinity of the magnetic field head and arranging the magnetic head movably in the electromagnetic shield member. CONSTITUTION:The shield ring 22 of the electromagnetic member is inserted to the circumference of the magnetic field head 8. The shield ring 22 consists of an annular member corresponding to the outside dimension of a head holder, and is formed by the quality of the material with a small electric resistance and loaded and fixed on the head holder. The magnetic field required for the magnetic field head 8 is a component in a perpendicular direction facing to a magneto-optical disk 3 side, and the component of the magnetic field in a horizontal direction is absorbed by the shield ring 22. Thus, an adverse influence due to the magnetic the component of the magnetic field in the horizontal direction among the magnetic fields generated by the magnetic field head 8. Further, in the countermeasure for the magnetic field and electric field, the driving circuit of the magnetic field head 8 comes to be a target by using a metallic frame 23, and the countermeasure is simplified.

公开(公告)号：JPH05198087A

公开(公告)日：1993-08-06

申请号：JP2742892

申请日：1992-01-18

Applicant: SONY CORP

Inventor： OMORI TAKASHI

IPC: G11B7/00 ,  G11B7/004 ,  G11B20/00 ,  G11B27/00 ,  G11B27/10

Abstract: PURPOSE:To divide and record recording data in plural areas by recording free area information, start area information, end area information, continuous reproduction information, and coupling address information as table data in a read-in area. CONSTITUTION:The area information, start area information, end area information, continuous reproduction information, and coupling address information are recorded as the table data in the read-in area A22 of an optical disk 1. The free area information indicates that a data recording area A21 is a free area and the start area information shows that the recording data in the area A21 is the start of a series of recording data. The end area information indicates that the recording data is the end of the series of recording data and the continuous reproduction information indicates the reproduction of recording data in a next successive cluster. Further, the coupling address information enables coupling even if a series of data indicating the coupling destination of another data recording area from one area A21 is divided and recorded in plural areas.