SE525754C2 - Apparat och metod för mätning av lokalt spåravstånd - Google Patents

Apparat och metod för mätning av lokalt spåravstånd

Info

Publication number
SE525754C2
SE525754C2 SE0100621A SE0100621A SE525754C2 SE 525754 C2 SE525754 C2 SE 525754C2 SE 0100621 A SE0100621 A SE 0100621A SE 0100621 A SE0100621 A SE 0100621A SE 525754 C2 SE525754 C2 SE 525754C2
Authority
SE
Sweden
Prior art keywords
signal
local
track
track distance
laser light
Prior art date
Application number
SE0100621A
Other languages
English (en)
Swedish (sv)
Other versions
SE0100621D0 (sv
SE0100621L (sv
Inventor
Ulf Wilhelmson
Original Assignee
Audiodev Ab
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
Application filed by Audiodev Ab filed Critical Audiodev Ab
Priority to SE0100621A priority Critical patent/SE525754C2/sv
Publication of SE0100621D0 publication Critical patent/SE0100621D0/xx
Priority to CN02801217A priority patent/CN1461402A/zh
Priority to JP2002569663A priority patent/JP2005518617A/ja
Priority to PCT/SE2002/000316 priority patent/WO2002070986A1/en
Priority to EP02700935A priority patent/EP1362217A1/en
Priority to KR1020027014206A priority patent/KR20030013389A/ko
Publication of SE0100621L publication Critical patent/SE0100621L/
Publication of SE525754C2 publication Critical patent/SE525754C2/sv

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Manufacturing Optical Record Carriers (AREA)
SE0100621A 2001-02-23 2001-02-23 Apparat och metod för mätning av lokalt spåravstånd SE525754C2 (sv)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE0100621A SE525754C2 (sv) 2001-02-23 2001-02-23 Apparat och metod för mätning av lokalt spåravstånd
CN02801217A CN1461402A (zh) 2001-02-23 2002-02-22 局部轨迹间距的测量装置和方法
JP2002569663A JP2005518617A (ja) 2001-02-23 2002-02-22 ローカルトラックのピッチを測定する装置及び方法
PCT/SE2002/000316 WO2002070986A1 (en) 2001-02-23 2002-02-22 A local track pitch measuring apparatus and method
EP02700935A EP1362217A1 (en) 2001-02-23 2002-02-22 A local track pitch measuring apparatus and method
KR1020027014206A KR20030013389A (ko) 2001-02-23 2002-02-22 로컬 트랙 피치 측정 장치 및 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0100621A SE525754C2 (sv) 2001-02-23 2001-02-23 Apparat och metod för mätning av lokalt spåravstånd

Publications (3)

Publication Number Publication Date
SE0100621D0 SE0100621D0 (sv) 2001-02-23
SE0100621L SE0100621L (sv) 2002-08-24
SE525754C2 true SE525754C2 (sv) 2005-04-19

Family

ID=20283109

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0100621A SE525754C2 (sv) 2001-02-23 2001-02-23 Apparat och metod för mätning av lokalt spåravstånd

Country Status (6)

Country Link
EP (1) EP1362217A1 (ja)
JP (1) JP2005518617A (ja)
KR (1) KR20030013389A (ja)
CN (1) CN1461402A (ja)
SE (1) SE525754C2 (ja)
WO (1) WO2002070986A1 (ja)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4504939A (en) * 1981-12-10 1985-03-12 Discovision Associates Storage medium track pitch detector
JP2635608B2 (ja) * 1987-08-29 1997-07-30 株式会社東芝 光学的情報記憶媒体検査装置
JPH02220237A (ja) * 1989-02-21 1990-09-03 Pioneer Electron Corp トラッキングサーボ装置におけるエラー信号増幅器のゲイン制御方式
JPH09330554A (ja) * 1996-05-28 1997-12-22 Pioneer Electron Corp 光ディスク再生装置

Also Published As

Publication number Publication date
JP2005518617A (ja) 2005-06-23
CN1461402A (zh) 2003-12-10
KR20030013389A (ko) 2003-02-14
WO2002070986A1 (en) 2002-09-12
SE0100621D0 (sv) 2001-02-23
SE0100621L (sv) 2002-08-24
EP1362217A1 (en) 2003-11-19

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Legal Events

Date Code Title Description
NUG Patent has lapsed