公开(公告)号：JPS62266749A

公开(公告)日：1987-11-19

申请号：JP11119986

申请日：1986-05-15

Applicant: SONY CORP

Inventor： WATANABE HIDETOSHI ,  YAMAMOTO MASANOBU ,  KUMAI SATOSHI

IPC: G11B7/26

Abstract: PURPOSE:To eliminate a stage for removing unnecessary parts of a resin layer and to improve productivity and transferability, as well as quality by coating and forming a group of a UV-curing resin having a thickness of a sheet metal through the insertion holes of the sheet metal onto one face of a disk substrate. CONSTITUTION:The sheet metal 2 formed with the plural through-holes 3 except in a central aperture 1a of the CD substrate 1 is imposed on the substrate 1 and a ski bar 14 is slid along the sheet metal 2 in an arrow X direction to coat the UV-curing resin 6 through the holes 3, by which the group 6A of the UV-curing resin is formed thereon to the thickness of the sheet metal 2. The substrate 1 is then imposed on the signal surface 7A of a disk stamper 7 formed with signal pits in such a manner as to hold the group 6A therebetween. The substrate 1 is moved in an arrow Y direction to press and defnrm the group 6A through press rollers 8, by which the UV-curing resin layer 6B is formed. The layer 6B is cured by irradiating UV rays UV on the layer 6B from the substrate 1 side to form the transfer layer 6C. The layer 6C is stripped from the stamper 7 and the disk 10 having the signal pit surface 10A corresponding to the surface 7A is obtd.

公开(公告)号：JP2001093152A

公开(公告)日：2001-04-06

申请号：JP26738299

申请日：1999-09-21

Applicant: SONY CORP

Inventor： TAKEDA RITSU ,  KUMAI SATOSHI ,  KONISHI AYUMI ,  SUZUKI JUNICHI

IPC: G11B7/09 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/12 ,  G11B27/19 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To eliminate a cross modulation component caused by wobbles of adjoining tracks. SOLUTION: This recorder comprises a spindle motor 12 for driving rotation of an optical disk 11, an optical head 20 for emitting a laser beam to a target track of the optical disk 11 and both neighbor tracks adjoining the target track and also detecting each returning light, a high-pass filter part 31 for transmitting high frequency components of a signal of the light returning from the target track detected by the optical head 20, low-pass filter parts 32, 33 for transmitting low frequency components of detection signals of the respective returning light from the above both neighbor tracks, an adder part 38 for summing/ subtracting the output signals from the high-pass filter part 31 and the low-pass filter parts 32, 33, and a PLL 39 for generating a reference signal as a time reference for recording signal generation based on the signal from the adder part 38, and offsets a cross modulation component by arithmetic operation in the adder part 38.

公开(公告)号：JP2000149271A

公开(公告)日：2000-05-30

申请号：JP31780098

申请日：1998-11-09

Applicant: SONY CORP

Inventor： TAKEDA RITSU ,  KUMAI SATOSHI ,  MIKAMI TATSURO ,  UEHARA SHUJI ,  OKANISHI TOSHIHARU ,  OGAWA KENJI ,  NISHIDA NORIO ,  SATO MASASHI ,  ISHIKAWA HIDEKI ,  MUNEKATA KAZUMI ,  YANAGIMOTO KAORU ,  MITSUNE NORICHIKA

IPC: G11B7/24 ,  G11B7/007 ,  G11B7/26 ,  G11B19/247 ,  G11B20/10 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To enable accurate recording and reproducing clocks to be generated by making constant the line density for the wave number regarding wobbling waveform of a track and forming a rotation angle mark indicating a prescribed rotation angle position of a disk. SOLUTION: Data are recorded while keeping constant line density(CLD), and the number of carrier waves of a wobbling group is assumed to CLD, further, a fine clock mark is added as CAV reference, and record and reproduction being more accurate are aimed at, and the wobbling period of a group is set. First, in adjacent tracks, the phase relation of a wobbling waveform is made so that a rotation angle position to be fixed relation exists. For example, when a rotation angle position of a start point of each rotation track is assumed to be 0 degree (the direction of 12 o'clock of a clock), the phase difference between adjacent tracks is made to have fixed relation at this position 0 degree. Further, a fine clock mark is added to a rotation angle position in fixed relation when phase difference is 0, 180, or 270 degrees.

公开(公告)号：JPH08185639A

公开(公告)日：1996-07-16

申请号：JP33974394

申请日：1994-12-29

Applicant: SONY CORP

Inventor： KANEKO KENJI ,  KUMAI SATOSHI

IPC: G11B11/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/125 ,  G11B11/105

Abstract: PURPOSE: To shorten the fluctuation period of light emitting power corresponding to switching by adding a bias voltage to a power control voltage thereby forming a synthesis power control voltage. CONSTITUTION: In an addition part 53, the bias voltage VB taken out by a switch 57 is added to the power control voltage VL obtained from a control part 44, and the synthesis power control voltage VLB is formed. The voltage VLB is supplied to a laser drive part 58, and a laser drive signal SLD' corresponding to the voltages VL and VB is supplied to a laser element 35. The element 35 light emits according to the signal SLD', and its light emitting power becomes one according to the voltages VL and VB, and the element 35 is feedback controlled so as to become one according to a reference signal SRP taken out by the switch 43.

公开(公告)号：JPH08111071A

公开(公告)日：1996-04-30

申请号：JP24545894

申请日：1994-10-11

Applicant: SONY CORP

Inventor： KANNO MASAKI ,  KUMAI SATOSHI

IPC: G11B20/14 ,  G11B7/005 ,  G11B20/10 ,  G11B20/22 ,  H03K5/01

Abstract: PURPOSE: To surely draw in an asymmetry correction amount by switching a switch means to an asymmetry detection circuit when a difference between a level of an asymmetry detection signal and a level of a mean value signal becomes a prescribed value or below. CONSTITUTION: The digital signal reproducing device is switched to a mean value circuit 8 side by a control circuit 4 in the initial state, and when a clock reproducing circuit 11 becomes to be in a lock state, and when the level of the asymmetry detection signal from the asymmetry detection circuit 14 becomes a prescribed value or above, a switch means 9 is switched to the asymmetry detection circuit 14 side. In such a case, even in a modulation system with a DC component, and even when no data lock is reproduced, asymmetry is detected effectively, and the asymmetry correction amount is surely drawn within a prescribed draw range even when a lock of a PLL comes off.

公开(公告)号：JPH087490A

公开(公告)日：1996-01-12

申请号：JP33156794

申请日：1994-12-09

Applicant: SONY CORP

Inventor： KUMAI SATOSHI ,  KANNO MASAKI ,  KIMURA MOTOI

IPC: G11B20/14 ,  G11B20/10 ,  H03K5/08 ,  H03M7/14

Abstract: PURPOSE:To efficiently perform asymmetry correction in a recording method of no DC component free. CONSTITUTION:A correction amount supplied from an asymmetry detection circuit is added to a slica level supplied from the slica level 4 in an adder 5, and the corrected slica level is made into a reference, and an equalized reproduced RF signal is binarized in a comparator 3. In the asymmetry detection circuit 6, the correction amount is decided from the reproduced binarized data from the comparator 3 and a reproducing clock from a PLL generation circuit 7 to be supplied to the adder 5. In a discriminator 8, a reproduced signal is generated from the reproduced binarized data and the reproducing clock.

公开(公告)号：JPH07296514A

公开(公告)日：1995-11-10

申请号：JP10452394

申请日：1994-04-20

Applicant: SONY CORP

Inventor： KUMAI SATOSHI

IPC: G11B5/09 ,  G11B20/10 ,  H03L7/08

Abstract: PURPOSE:To prevent a slice level fro, moving to a cross point with a different eye pattern. CONSTITUTION:In a comparator 23, a reproduced RF signal equalized based on the slice level where a correction variable supplied from an asymmetry detection circuit 26 and the slice level supplied from the slice level 24 are added, that is, corrected in an adder 25 is binarized. In the asymmetry detection circuit 26, the correction variable is decided from the regenerative binarized data from the comparator 23 and a reproduced clock from a PLL generation circuit 27 to be supplied to the adder 25. In a discriminated 28, a reproduced signal is generated from the regenerative binarized data and the reproduced clock.

公开(公告)号：JPH07254224A

公开(公告)日：1995-10-03

申请号：JP4610594

申请日：1994-03-16

Applicant: SONY CORP

Inventor： KUMAI SATOSHI

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

Abstract: PURPOSE:To obtain a highly reliable reproduced data. CONSTITUTION:A threshold-generating circuit 22 optimizes and generates a threshold voltage in compliance with the waveform of a reproduced signal at each track unit of a magneto-optical disk 10 based on the clock signal CK inputted from a clock reproducing circuit 30, various kinds of the timing signals inputted from a threshold-reproduction timing circuit 34, and the RF signal inputted from a separating circuit 18, and inputs the voltage SL into a decoding circuit 28. The decoding circuit 28 compares the threshold voltage SL which is optimized by the threshold generating circuit 22 with the RF signal, and identifies from the RF signal binary coded data.

公开(公告)号：JPH0676286A

公开(公告)日：1994-03-18

申请号：JP22880392

申请日：1992-08-27

Applicant: SONY CORP

Inventor： KUMAI SATOSHI

IPC: G11B7/00 ,  G11B7/003 ,  G11B7/005 ,  G11B7/007

Abstract: PURPOSE:To record in respective recording areas with optimum power, to evade apprehensions that laser power becomes a recording state at a reproducing time as well and to facilitate retrieval. CONSTITUTION:A data recording area DRA and an index recording area IRA are provided proximately on an optical tape 1. At a recording time, recording data is written in the recording area DRA spread over both recording areas in the scanning direction H of an optical recording head in a rotary optical system, when the head passes through the retrieval area IRA, continuously lighting recording is performed by an index mark according to retrieval data. At a reproducing time, the data recorded in the data recording area DRA is read by using the rotary optical system, and the retrieval data in the index recording area IRA recorded along the tape transfer direction L of the optical tape 1 is read by using a still reproducing optical system.

公开(公告)号：JPH03134852A

公开(公告)日：1991-06-07

申请号：JP27333589

申请日：1989-10-20

Applicant: SONY CORP

Inventor： KUMAI SATOSHI ,  NARAHARA TATSUYA ,  OSUE TADASHI ,  TOGAWA KAZUO

IPC: G11B15/61 ,  G11B7/00 ,  G11B7/003

Abstract: PURPOSE:To prevent the occurrence of ruggedness on a recording surface of a tape-like optical recording medium due to wrinkles, etc., by providing a groove part of a prescribed shape in a part of the outer circumferential surface of a drum, on which the optical recording medium is slid in contact. CONSTITUTION:The tape-like optical medium 2 is wound around the outer circumference 21A of the rotary drum 21, and the optical recording medium 2 is irradiated by a light beam LA1 from an optical head 9 provided outside the drum 2, so that information is recorded and/or reproduced on the optical recording medium 2. In this case, the groove part 25 formed along an irradiating position of the light beam LA1 is provided on the outer circumferential surface 21B of the drum to be slid in contact with the side of the back side 2B of a recording area 2A of the optical recording medium 2 to be irradiated by the light beam LA1. Consequently, the recording area 2A of the optical recording medium to be irradiated by the light beam LA1 is always supported on its back side 2B by an air layer. By this method, even in case of a foreign matter such as dust, etc., mixed into between the optical recording medium 2 and the outer circumferential surface 21B of the rotary drum 21, etc., no ruggedness takes place on the surface of the tape-like optical recording medium 2.