DE69027514D1 - Optisches Gerät zur Detektion der Modulation eines Lichtstrahls - Google Patents
Optisches Gerät zur Detektion der Modulation eines LichtstrahlsInfo
- Publication number
- DE69027514D1 DE69027514D1 DE69027514T DE69027514T DE69027514D1 DE 69027514 D1 DE69027514 D1 DE 69027514D1 DE 69027514 T DE69027514 T DE 69027514T DE 69027514 T DE69027514 T DE 69027514T DE 69027514 D1 DE69027514 D1 DE 69027514D1
- Authority
- DE
- Germany
- Prior art keywords
- modulation
- detecting
- light beam
- optical device
- optical
- 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 - Fee Related
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/133—Shape of individual detector elements
-
- 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
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Head (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/448,450 US5105415A (en) | 1989-12-11 | 1989-12-11 | Detecting magnetooptic and intensity-modulated optical signals with the same detector |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69027514D1 true DE69027514D1 (de) | 1996-07-25 |
DE69027514T2 DE69027514T2 (de) | 1997-01-23 |
Family
ID=23780346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69027514T Expired - Fee Related DE69027514T2 (de) | 1989-12-11 | 1990-12-07 | Optisches Gerät zur Detektion der Modulation eines Lichtstrahls |
Country Status (6)
Country | Link |
---|---|
US (1) | US5105415A (de) |
EP (1) | EP0432977B1 (de) |
JP (1) | JP2575531B2 (de) |
KR (1) | KR940001447B1 (de) |
CA (1) | CA2025924C (de) |
DE (1) | DE69027514T2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5835472A (en) * | 1990-07-31 | 1998-11-10 | Omron Corporation | Optical pickup device with substantially mutually orthogonal reflection surfaces |
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 |
US5442618A (en) * | 1993-11-12 | 1995-08-15 | International Business Machines Corporation | Common mode rejection control in an optical disk drive |
CN1088233C (zh) * | 1995-01-31 | 2002-07-24 | 索尼公司 | 光信号检测电路 |
US6118753A (en) * | 1996-08-13 | 2000-09-12 | Hewlett-Packard Company | Erasable digital video disk with reference clock track |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4337534A (en) * | 1979-04-18 | 1982-06-29 | Discovision Associates | Solid state electro-optical track follower array |
NL8103505A (nl) * | 1981-07-24 | 1983-02-16 | Philips Nv | Inrichting voor het puntsgewijs aftasten van een voorwerp. |
JPS59148145A (ja) * | 1983-02-14 | 1984-08-24 | Fujitsu Ltd | 表面欠陥検査装置 |
JPS59198537A (ja) * | 1983-04-22 | 1984-11-10 | Matsushita Electric Ind Co Ltd | 光学的記録再生装置 |
US4691308A (en) * | 1984-04-19 | 1987-09-01 | Nippon Kogaku K. K. | Apparatus for reproducing information from magnetooptical recording medium |
US4617654A (en) * | 1984-06-12 | 1986-10-14 | National Semiconductor Corporation | Matrix circuit for optical disc systems |
US4858218A (en) * | 1984-09-12 | 1989-08-15 | Nikon Corporation | Optical recording medium and reproducing apparatus |
JPH0746435B2 (ja) * | 1985-03-14 | 1995-05-17 | オリンパス光学工業株式会社 | 光学的情報記録再生装置における光ピックアップの異常判別装置 |
US4833662A (en) * | 1985-05-02 | 1989-05-23 | Olympus Optical Co., Ltd. | Reproduction apparatus for a magneto-optical recording medium |
JPS6361427A (ja) * | 1986-09-01 | 1988-03-17 | Olympus Optical Co Ltd | 光学式記録再生装置 |
JPH07101523B2 (ja) * | 1986-09-12 | 1995-11-01 | キヤノン株式会社 | 光磁気信号再生装置 |
DE3732874A1 (de) * | 1987-09-30 | 1989-04-20 | Thomson Brandt Gmbh | Optische abtastvorrichtung |
JPH0777048B2 (ja) * | 1987-06-26 | 1995-08-16 | 三菱電機株式会社 | 記録媒体駆動装置 |
US4785167A (en) * | 1987-08-26 | 1988-11-15 | International Business Machines Corporation | Photodetector having cascaded photoelements |
US4823220A (en) * | 1987-11-16 | 1989-04-18 | International Business Machines Corporation | Detector for magnetooptic recorders |
US4847824A (en) * | 1987-12-21 | 1989-07-11 | International Business Machines Corporation | Readback circuits for magnetooptic players |
JP2655682B2 (ja) * | 1988-06-08 | 1997-09-24 | 株式会社日立製作所 | 光磁気情報記録再生装置 |
US5034934A (en) * | 1988-07-15 | 1991-07-23 | Pioneer Electronic Corp. | Opto-magnetic disk unit with improved dynamic range characteristics and opto-magnetic disk therefor |
US5050144A (en) * | 1989-12-11 | 1991-09-17 | International Business Machines Corporation | Recording intensity modulated signals and polarization-modulated optical signals in the same area of a storage member |
-
1989
- 1989-12-11 US US07/448,450 patent/US5105415A/en not_active Expired - Lifetime
-
1990
- 1990-09-21 CA CA002025924A patent/CA2025924C/en not_active Expired - Fee Related
- 1990-11-20 JP JP2313004A patent/JP2575531B2/ja not_active Expired - Fee Related
- 1990-11-27 KR KR1019900019242A patent/KR940001447B1/ko not_active IP Right Cessation
- 1990-12-07 DE DE69027514T patent/DE69027514T2/de not_active Expired - Fee Related
- 1990-12-07 EP EP90313350A patent/EP0432977B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR910013106A (ko) | 1991-08-08 |
EP0432977A3 (en) | 1992-12-16 |
CA2025924C (en) | 1995-08-01 |
DE69027514T2 (de) | 1997-01-23 |
EP0432977B1 (de) | 1996-06-19 |
US5105415A (en) | 1992-04-14 |
JP2575531B2 (ja) | 1997-01-29 |
JPH03189525A (ja) | 1991-08-19 |
EP0432977A2 (de) | 1991-06-19 |
KR940001447B1 (ko) | 1994-02-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69025481T2 (de) | Optischer Modulator | |
DE69028592D1 (de) | Gerät zur automatischen Generierung eines Index | |
DE69315864T2 (de) | Faseroptische Vorrichtung zur Wellenlängenselektion | |
FR2608790B1 (fr) | Dispositif perfectionne de test pour disques optiques | |
FR2608789B1 (fr) | Dispositif de test pour disques optiques | |
DE69124864T2 (de) | Vorrichtung zur Modulation der Abtastgeschwindigkeit eines Strahls | |
DE69306201D1 (de) | Einrichtung zur optischen Modulation | |
AT382733B (de) | Optisches system fuer leuchtkoerper eines lichtanzeigegeraetes | |
DE69516799T2 (de) | Optoelektronischer Sensor zur Messung der Intensität und der Einfallsrichtung eines Lichtstrahls | |
DE69123711T2 (de) | Gerät zur Detektion der Position eines Lichtpunktes | |
ATA136488A (de) | Gleismessgeraet zur vermessung eines unteren lichtraumprofiles | |
DE69218275D1 (de) | Gerät zur Erfassung der Lage eines Lichtflecks | |
DE69027514T2 (de) | Optisches Gerät zur Detektion der Modulation eines Lichtstrahls | |
DE69309692T2 (de) | Optische vorrichtung zur ringförmigen beleuchtung eines punktes | |
ATA65189A (de) | Einrichtung zur konstanthaltung der luftwellenlaenge von laserlicht | |
DE69318534T2 (de) | Gerät zur messung der optischen wellenlänge | |
DE59003868D1 (de) | Einrichtung zur Umlenkung und Fokussierung eines Lichtstrahls. | |
FR2647915B1 (fr) | Appareil photocommande de deviation d'un faisceau lumineux | |
DE69521382D1 (de) | Gerät zur verstärkung der modulationsamplitude eines optischen strahls | |
DE69113935D1 (de) | Detektor zur Feststellung der Position eines Lichtpunkts und optischer Kopf. | |
DE59107311D1 (de) | Optisches gerät, insbesondere zur messung der geschwindigkeit einer bewegten oberfläche mittels eines von einem laser ausgehenden messlichtstrahls | |
DE59008904D1 (de) | Integrierte optische Einrichtung zur interferometrischen Vermessung von Lichtwellen. | |
DE68916576D1 (de) | Vorrichtung zur Messung der Kennzeichen der optischen Frequenzmodulation. | |
FR2631684B1 (fr) | Dispositif de coloration de faisceau lumineux | |
DE69115732T2 (de) | Vorrichtung zur Feststellung der Neigung einer optischen Platte |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |