DE69324983T2 - Aufzeichnungs-/Wiedergabegerät für scheibenförmiges Aufzeichnungsmedium, Photodetektor und optischer Kopf - Google Patents

Aufzeichnungs-/Wiedergabegerät für scheibenförmiges Aufzeichnungsmedium, Photodetektor und optischer Kopf

Info

Publication number
DE69324983T2
DE69324983T2 DE69324983T DE69324983T DE69324983T2 DE 69324983 T2 DE69324983 T2 DE 69324983T2 DE 69324983 T DE69324983 T DE 69324983T DE 69324983 T DE69324983 T DE 69324983T DE 69324983 T2 DE69324983 T2 DE 69324983T2
Authority
DE
Germany
Prior art keywords
photodetector
disc
playback device
optical head
recording medium
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE69324983T
Other languages
English (en)
Other versions
DE69324983D1 (de
Inventor
Nobuhiko Ando
Ryo Ando
Kazuhiko Fujiie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of DE69324983D1 publication Critical patent/DE69324983D1/de
Publication of DE69324983T2 publication Critical patent/DE69324983T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording 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
    • G11B11/10—Recording 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
    • G11B11/105—Recording 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 thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function
    • G11B11/10597—Adaptations for transducing various formats on the same or different carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • G11B7/0901—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 for track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/0908—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 for focusing only
    • G11B7/0909—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 for focusing only by astigmatic methods
    • 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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
DE69324983T 1992-09-24 1993-09-15 Aufzeichnungs-/Wiedergabegerät für scheibenförmiges Aufzeichnungsmedium, Photodetektor und optischer Kopf Expired - Lifetime DE69324983T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4255023A JPH06111334A (ja) 1992-09-24 1992-09-24 円盤状記録媒体用の記録及び／又は再生装置、光検出器及び光ヘッド

Publications (2)

Publication Number Publication Date
DE69324983D1 DE69324983D1 (de) 1999-06-24
DE69324983T2 true DE69324983T2 (de) 1999-11-11

Family

ID=17273118

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69324983T Expired - Lifetime DE69324983T2 (de) 1992-09-24 1993-09-15 Aufzeichnungs-/Wiedergabegerät für scheibenförmiges Aufzeichnungsmedium, Photodetektor und optischer Kopf

Country Status (7)

Country Link
US (3) US5453607A (de)
EP (1) EP0589611B1 (de)
JP (1) JPH06111334A (de)
KR (1) KR100270854B1 (de)
AU (1) AU672990B2 (de)
CA (1) CA2106124C (de)
DE (1) DE69324983T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062078A1 (de) * 2000-12-13 2002-06-20 Thomson Brandt Gmbh Verfahren zum Erzeugen eines Linsenpositionssignals sowie entsprechendes Gerät zum Lesen und/oder Beschreiben eines optischen Aufzeichnungsträgers

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236625B1 (en) 1991-02-15 2001-05-22 Discovision Associates Optical disc system having current monitoring circuit with controller for laser driver and method for operating same
US5677899A (en) 1991-02-15 1997-10-14 Discovision Associates Method for moving carriage assembly from initial position to target position relative to storage medium
US5729511A (en) 1991-02-15 1998-03-17 Discovision Associates Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal
TW238381B (en) * 1993-10-29 1995-01-11 Ibm Optical data storage cartridge system
KR970011227B1 (ko) * 1994-04-30 1997-07-08 대우전자 주식회사 멀티 레이저비임형 광픽업장치
KR100230234B1 (ko) * 1994-06-30 1999-11-15 윤종용 광픽업의 신호검출장치
US5914929A (en) * 1994-09-07 1999-06-22 Sanyo Electric Co., Ltd. Optical disk recording/playback device with means to recognize, read from and record to multiple types of optical disk types
KR100200832B1 (ko) * 1994-11-29 1999-06-15 윤종용 포커스 에러검출장치
US5889883A (en) * 1995-01-23 1999-03-30 Mars Incorporated Method and apparatus for optical sensor system and optical interface circuit
US6434087B1 (en) 1995-01-25 2002-08-13 Discovision Associates Optical disc system and method for controlling bias coil and light source to process information on a storage medium
JP3322075B2 (ja) * 1995-06-02 2002-09-09 松下電器産業株式会社 光磁気ピックアップ
US5621717A (en) * 1995-06-07 1997-04-15 International Business Machines Corporation Reading optical disks having substrates with diverse axial thicknesses
US5796701A (en) * 1995-06-23 1998-08-18 Sony Corporation Optical pickup and opto-magnetic signal reproducing apparatus
DE69618722T2 (de) * 1995-08-09 2002-08-22 Sony Corp Aufzeichnungsmedium, Aufzeichnungsgerät und Wiedergabegerät
US5907530A (en) * 1995-08-30 1999-05-25 Samsung Electronics Co., Ltd. Optical pickup device
KR100234257B1 (ko) * 1995-08-30 1999-12-15 윤종용 대물렌즈 장치 및 안정된 포커스 서보 신호를 얻는방법 및 이를 적용한 광픽업 장치 및 두께가 다른 디스크를 판별하는 방법 및 두께가 다른 디스크로부터 정보를 재생하고 기록하는 방법
USRE39025E1 (en) * 1995-08-30 2006-03-21 Samsung Electronics Co., Ltd. Lens device including a light controlling mechanism and an optical pickup apparatus using a lens device
DE19536396A1 (de) * 1995-09-29 1997-04-03 Thomson Brandt Gmbh Wiedergabe- und/oder Aufzeichnungsgerät für optische Aufzeichnungsträger unterschiedlicher Speicherdichte
JP3633069B2 (ja) * 1995-12-15 2005-03-30 富士通株式会社 光ディスク装置
JPH09167429A (ja) * 1995-12-15 1997-06-24 Fujitsu Ltd 光ディスク装置
US5963523A (en) * 1996-02-14 1999-10-05 Matsushita Electric Industrial Co., Ltd. Optical recording medium discriminating apparatus using laser beams of different wavelengths
US6430125B1 (en) * 1996-07-03 2002-08-06 Zen Research (Ireland), Ltd. Methods and apparatus for detecting and correcting magnification error in a multi-beam optical disk drive
WO1998031012A1 (fr) 1997-01-10 1998-07-16 Sony Corporation Systeme de disques optiques et systeme discernant les disques optiques
JPH10199003A (ja) * 1997-01-10 1998-07-31 Sony Corp 光ディスク装置
JPH10241199A (ja) * 1997-02-25 1998-09-11 Sharp Corp 光ピックアップ
JPH10256841A (ja) * 1997-03-14 1998-09-25 Sony Corp フォトダイオード増幅回路
JPH10320903A (ja) * 1997-05-19 1998-12-04 Sony Corp 光ディスク装置及びディスクカートリッジ
US6564009B2 (en) * 1997-05-19 2003-05-13 Sony Corporation Apparatus for recording and/or reproducing data onto and/or from an optical disk and method thereof
US6088315A (en) * 1997-05-28 2000-07-11 Sony Corporation Disc recording and/or reproducing apparatus and its motor drive control circuit
JP2885232B2 (ja) * 1997-06-27 1999-04-19 日本電気株式会社 ディスク記録装置および方法
JPH11120683A (ja) 1997-10-15 1999-04-30 Mitsumi Electric Co Ltd 光ディスク装置
US6567353B1 (en) * 1999-01-21 2003-05-20 Pentax Corporation Optical head with light receiving element surfaces divided into at least three light receiving areas
JP3866016B2 (ja) * 1999-07-02 2007-01-10 Ｔｄｋ株式会社 光情報媒体およびその再生方法
JP4380004B2 (ja) * 2000-02-28 2009-12-09 ソニー株式会社 記録媒体の製造方法、および記録媒体製造用原盤の製造方法
US6744031B1 (en) * 2001-11-27 2004-06-01 Ricoh Company, Ltd. High speed sampling circuit
JP2002216372A (ja) * 2001-01-23 2002-08-02 Pioneer Electronic Corp 光ピックアップ装置
JP2004054985A (ja) * 2002-07-17 2004-02-19 Sony Corp 情報記録装置及び情報記録再生装置
TWI240920B (en) * 2003-03-21 2005-10-01 Mediatek Inc Method for accessing variable memory of an optical disk drive
KR20060087012A (ko) * 2005-01-27 2006-08-02 삼성전자주식회사 광디스크 드라이브
JP4994355B2 (ja) * 2008-12-22 2012-08-08 三菱電機株式会社 画像処理装置及び方法並びに画像表示装置

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909608A (en) * 1972-12-26 1975-09-30 Thomson Csf Reproducing device for the optical reading out of a record carrying an embossed print
FR2271590B1 (de) * 1974-01-15 1978-12-01 Thomson Brandt
US4561032A (en) * 1981-06-02 1985-12-24 Canon Kabushiki Kaisha Magnetooptic reproducing device
DE3342525A1 (de) * 1982-11-27 1984-05-30 Canon K.K., Tokio/Tokyo Geraet zur informations-aufzeichnung und/oder -wiedergabe
JPS61180935A (ja) * 1985-02-06 1986-08-13 Matsushita Electric Ind Co Ltd 光学的信号記録再生装置
FR2591787A1 (fr) * 1985-12-13 1987-06-19 Thomson Csf Dispositif d'enregistrement-lecture polyvalent de support d'enregistrement
DE3750409T2 (de) * 1986-02-07 1995-03-30 Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka Optische Platte und Plattengerät zum Aufzeichnen oder Wiedergeben von Daten in oder von der Platte.
KR900008380B1 (ko) * 1986-07-01 1990-11-17 미쓰비시덴기 가부시기 가이샤 광학식 헤드장치
JP2565196B2 (ja) * 1986-09-30 1996-12-18 ソニー株式会社 記録装置及び記録方法
JPH0677351B2 (ja) * 1986-11-15 1994-09-28 ソニー株式会社 光学ピツクアツプ装置
US5270996A (en) * 1986-12-25 1993-12-14 Nec Corporation Optical head with diffraction grating producing five diffracted detection light beams
JPS63109366U (de) * 1986-12-27 1988-07-14
US4951274A (en) * 1987-01-23 1990-08-21 Nec Corporation Magneto-optical head capable of separating beams for reading recorded information and servo information by use of one optical element
JPS63306535A (ja) * 1987-06-05 1988-12-14 Sharp Corp 光学的記録再生装置
JP2583273B2 (ja) * 1988-04-04 1997-02-19 株式会社日本コンラックス 光学的情報記録再生方法および装置
JPH0758559B2 (ja) * 1988-09-02 1995-06-21 シャープ株式会社 光ピックアップ装置
US5161139A (en) * 1989-01-06 1992-11-03 Kabushiki Kaisha Toshiba Focusing error detecting apparatus
DE3942943A1 (de) * 1989-12-23 1991-06-27 Thomson Brandt Gmbh Optische abtastvorrichtung
US5257253A (en) * 1989-03-07 1993-10-26 Pioneer Electronic Corporation Laser vision disc with digital sound (LDD) disc player for reproducing analog audio signals mixed with digital audio signals
JPH03100931A (ja) * 1989-09-14 1991-04-25 Mitsubishi Electric Corp 光学式情報記録再生装置
JP2979592B2 (ja) * 1990-06-21 1999-11-15 ソニー株式会社 ディスクカートリッジ
CA2047606C (en) * 1990-07-24 1996-08-13 Michiyoshi Nagashima Optical disk reproducing method and optical disk reproducing apparatus
JP2961982B2 (ja) * 1990-08-24 1999-10-12 ソニー株式会社 ディスクカートリッジ
GB2248989B (en) * 1990-10-15 1995-05-24 Applied Magnetics Corp Focus sensing apparatus and method
US5297114A (en) * 1990-11-30 1994-03-22 Asahi Kogaku Kogyo Kabushiki Kaisha Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
US5281802A (en) * 1991-02-20 1994-01-25 Ricoh Company, Ltd. Focus error signal detection device with separating prism
JP3368908B2 (ja) * 1991-07-24 2003-01-20 松下電器産業株式会社 光磁気ディスク記録再生装置
US5278401A (en) * 1991-08-13 1994-01-11 Asahi Kogaku Kogyo Kabushiki Kaisha Optical disc apparatus having five light receiving areas for detecting focus error and tracking error

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062078A1 (de) * 2000-12-13 2002-06-20 Thomson Brandt Gmbh Verfahren zum Erzeugen eines Linsenpositionssignals sowie entsprechendes Gerät zum Lesen und/oder Beschreiben eines optischen Aufzeichnungsträgers
US7266057B2 (en) 2000-12-13 2007-09-04 Thomson Licensing Method for generating a lens position signal and corresponding apparatus for reading from and/or writing to an optical recording medium

Also Published As

Publication number Publication date
EP0589611A3 (en) 1994-08-17
US5559769A (en) 1996-09-24
CA2106124C (en) 2003-01-21
KR940007798A (ko) 1994-04-28
EP0589611A2 (de) 1994-03-30
CA2106124A1 (en) 1994-03-25
AU672990B2 (en) 1996-10-24
US5453607A (en) 1995-09-26
JPH06111334A (ja) 1994-04-22
DE69324983D1 (de) 1999-06-24
KR100270854B1 (ko) 2000-11-01
AU4611593A (en) 1994-03-31
US5479387A (en) 1995-12-26
EP0589611B1 (de) 1999-05-19

Similar Documents

Publication Publication Date Title
DE69324983D1 (de) Aufzeichnungs-/Wiedergabegerät für scheibenförmiges Aufzeichnungsmedium, Photodetektor und optischer Kopf
DE69329765T2 (de) Optisches Informationsaufzeichnungsmedium und optisches Informationsaufzeichnungs- und Wiedergabegerät
DE69630549D1 (de) Plattenförmiges Aufzeichnungsmedium, Aufzeichnungs- und Wiedergabegerät
DE69222235D1 (de) Informationsaufzeichnungsplatte und Wiedergabegerät dafür
DE69422870T2 (de) Informationsaufzeichnungsträger, optische Platten und Wiedergabesystem
DE69518336D1 (de) Aufzeichnungsmedium und Datenwiedergabegerät
DE69726482D1 (de) Aufzeichnungsträger, optische Platteneinrichtung und Informationsaufzeichnungsverfahren
DE69127776D1 (de) Aufnahmedatenträger und Informationsaufnahme- und Wiedergabegerät
DE69616885D1 (de) Optisches Aufzeichnungsmedium und optisches Informationsaufzeichnungs-/-wiedergabegerät
DE69420634T2 (de) Wiedergabegerät für Aufzeichnungsmedium
DE69429935T2 (de) Aufzeichnungs-Wiedergabegerät für Aufzeichnungsmedium
DE69418384D1 (de) Informationswiedergabegerät und Informationsaufzeichnungsmedium
DE69123523D1 (de) Optischer Kopf für magnetooptisches Aufzeichnungs-/Wiedergabegerät
DE69518584T2 (de) Optischer Kopf, der evaneszentes Licht verwendet und optisches Aufzeichnungs/Wiedergabegerät für Daten
DE69326965T2 (de) Aufzeichnungsträgerkassette, Anzeigegerät und Aufzeichnungs-/Wiedergabegerät
DE69022951D1 (de) Optischer Kopf für optisches Informationsaufzeichnungsmedium.
DE69123192D1 (de) Optischer Kopf für magnetooptisches Informationswiedergabegerät
DE69322905T2 (de) Kassette für plattenförmiges Aufzeichnungsmedium
DE69329355D1 (de) Optisches Aufzeichnungsmedium und optisches Aufzeichnungs/Wiedergabegerät
DE69726527D1 (de) Optischer kopf und optisches aufzeichnungsgerät
DE69620061T2 (de) Optisches Medium und Aufzeichnungs-/Wiedergabegerät dafür
DE69521167T2 (de) Datenaufzeichnungsmedium, optische Platte und optisches Plattengerät
DE69320422D1 (de) Optisches Aufzeichnungsmedium, Informationsaufzeichnungsmethode und Informationswiedergabemethode
DE69617873T2 (de) Optischer Kopf für Informationsaufzeichnungs-/-wiedergabegerät
DE68925465D1 (de) Optisches Aufzeichnungsmedium und Aufnahme-/Wiedergabesystem

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)