WO2002029788A1 - Disk unit - Google Patents

Disk unit Download PDF

Info

Publication number
WO2002029788A1
WO2002029788A1 PCT/JP2001/008737 JP0108737W WO0229788A1 WO 2002029788 A1 WO2002029788 A1 WO 2002029788A1 JP 0108737 W JP0108737 W JP 0108737W WO 0229788 A1 WO0229788 A1 WO 0229788A1
Authority
WO
WIPO (PCT)
Prior art keywords
control voltage
peak level
vca
applied
fcm signal
Prior art date
Application number
PCT/JP2001/008737
Other languages
French (fr)
Inventor
Koichi Tada
Toshihide Hamaguchi
Tadashi Okajima
Original Assignee
Sanyo Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2000-305610 priority Critical
Priority to JP2000305610A priority patent/JP2002117535A/en
Application filed by Sanyo Electric Co., Ltd. filed Critical Sanyo Electric Co., Ltd.
Publication of WO2002029788A1 publication Critical patent/WO2002029788A1/en

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005Reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermo-magnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055Disposition or mounting of transducers relative to record carriers
    • G11B11/10556Disposition or mounting of transducers relative to record carriers with provision for moving or switching or masking the transducers in or out of their operative position
    • G11B11/10563Access of indexed parts
    • G11B11/10565Marks for track change, e.g. prepits, gray codes
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00745Sectoring or header formats within a track

Abstract

A disk unit (10) including a VCA (36) to which a first control voltage and a second control voltage are applied at different timings. The VCA (36) amplifies an FCM signal at a gain corresponding to an applied control voltage, the peak level of the amplified FCM signal being detected by a peak-hold circuit (38). A DSP (44) calculates an optimum control voltage providing an optimum peak level based on the peak level of an FCM signal to which a gain corresponding to the first control voltage is assigned and on the peak level of an FCM signal to which a gain corresponding to the second control voltage is assigned. Then, the calculated optimum control voltage is applied to the VCA (36).
PCT/JP2001/008737 2000-10-05 2001-10-03 Disk unit WO2002029788A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2000-305610 2000-10-05
JP2000305610A JP2002117535A (en) 2000-10-05 2000-10-05 Disk device

Publications (1)

Publication Number Publication Date
WO2002029788A1 true WO2002029788A1 (en) 2002-04-11

Family

ID=18786435

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/008737 WO2002029788A1 (en) 2000-10-05 2001-10-03 Disk unit

Country Status (2)

Country Link
JP (1) JP2002117535A (en)
WO (1) WO2002029788A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0982031A (en) * 1995-09-14 1997-03-28 Sony Corp Apparatus and method for gain control as well as reproducing apparatus
WO1998054703A1 (en) * 1997-05-28 1998-12-03 Sanyo Electric Co., Ltd. Recording medium and reproducing apparatus therefor
WO1999040576A1 (en) * 1998-02-06 1999-08-12 Sanyo Electric Co., Ltd. Optical disc device
JPH11306686A (en) * 1998-04-21 1999-11-05 Sony Corp Signal processing circuit
WO2001088907A1 (en) * 2000-05-19 2001-11-22 Sanyo Electric Co., Ltd. Disk reproducing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0982031A (en) * 1995-09-14 1997-03-28 Sony Corp Apparatus and method for gain control as well as reproducing apparatus
WO1998054703A1 (en) * 1997-05-28 1998-12-03 Sanyo Electric Co., Ltd. Recording medium and reproducing apparatus therefor
WO1999040576A1 (en) * 1998-02-06 1999-08-12 Sanyo Electric Co., Ltd. Optical disc device
JPH11306686A (en) * 1998-04-21 1999-11-05 Sony Corp Signal processing circuit
WO2001088907A1 (en) * 2000-05-19 2001-11-22 Sanyo Electric Co., Ltd. Disk reproducing device

Also Published As

Publication number Publication date
JP2002117535A (en) 2002-04-19

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DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
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122 Ep: pct application non-entry in european phase