JPS57500852A - - Google Patents

Info

Publication number
JPS57500852A
JPS57500852A JP56501768A JP50176881A JPS57500852A JP S57500852 A JPS57500852 A JP S57500852A JP 56501768 A JP56501768 A JP 56501768A JP 50176881 A JP50176881 A JP 50176881A JP S57500852 A JPS57500852 A JP S57500852A
Authority
JP
Japan
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.)
Pending
Application number
JP56501768A
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 filed Critical
Publication of JPS57500852A publication Critical patent/JPS57500852A/ja
Pending 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G11B7/0051—Reproducing involving phase depth effects
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
JP56501768A 1980-06-20 1981-05-12 Pending JPS57500852A (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/161,486 US4349901A (en) 1980-06-20 1980-06-20 Apparatus and method for reading optical discs

Publications (1)

Publication Number Publication Date
JPS57500852A true JPS57500852A (ja) 1982-05-13

Family

ID=22581370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56501768A Pending JPS57500852A (ja) 1980-06-20 1981-05-12

Country Status (4)

Country Link
US (1) US4349901A (ja)
EP (1) EP0054037A4 (ja)
JP (1) JPS57500852A (ja)
WO (1) WO1982000067A1 (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5253244A (en) * 1980-07-16 1993-10-12 Discovision Associates System for recording digital information in a pulse-length modulation format
US5553047A (en) * 1980-07-16 1996-09-03 Discovision Associates System for recording digital information in a pulse-length modulation format
JPS57111837A (en) * 1980-12-27 1982-07-12 Olympus Optical Co Ltd Signal detecting system of optical information reader
JPS5817549A (ja) * 1981-07-22 1983-02-01 Hitachi Ltd 光学的トラツク追従装置
NL8103505A (nl) * 1981-07-24 1983-02-16 Philips Nv Inrichting voor het puntsgewijs aftasten van een voorwerp.
JPS5856236A (ja) * 1981-09-28 1983-04-02 Hitachi Ltd 光学的トラック位置検出装置およびそれを用いた光学的記録再生装置
US4534021A (en) * 1981-12-10 1985-08-06 Discovision Associates Angularly multiplexed optical recording medium
US4477891A (en) * 1982-03-12 1984-10-16 Rca Corporation Multi-bandwidth optical playback apparatus having minimum baseband distortion
USRE32660E (en) * 1982-04-19 1988-05-03 Siscan Systems, Inc. Confocal optical imaging system with improved signal-to-noise ratio
JPS5936338A (ja) * 1982-08-24 1984-02-28 Matsushita Electric Ind Co Ltd 光デイスク記録再生方法
US4684799A (en) * 1983-09-19 1987-08-04 Ricoh Company, Ltd. Focus detection method involving cutting more than half of light beam reflected from disc
JPS6069840A (ja) * 1983-09-22 1985-04-20 Canon Inc 情報記録又は再生装置
JPS60197950A (ja) * 1984-03-22 1985-10-07 Toshiba Corp 光学ヘツド
JPS6124033A (ja) * 1984-07-13 1986-02-01 Sony Corp 光学式ヘツドのトラツキング誤差検出装置
JPS61160714A (ja) * 1985-01-09 1986-07-21 Canon Inc 焦点距離可変レンズ
JPH0792916B2 (ja) * 1985-02-08 1995-10-09 松下電器産業株式会社 光学記録信号再生方法
US5247510A (en) * 1990-06-29 1993-09-21 Digital Equipment Corporation Increasing storage density of optical data media by detecting a selected portion of a light spot image corresponding to a single domain
US5414512A (en) * 1993-03-10 1995-05-09 Grant Engineering, Inc. Method and apparatus for viewing a shearographic image
KR100200873B1 (ko) * 1996-01-11 1999-06-15 윤종용 광 픽업 장치

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5465007A (en) * 1977-11-02 1979-05-25 Matsushita Electric Ind Co Ltd Disc form recording carrier reader

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2031515C3 (de) * 1970-06-25 1982-04-15 Siemens AG, 1000 Berlin und 8000 München Verfahren zum Auslesen von Informationen
US4010317A (en) * 1972-03-29 1977-03-01 U.S. Philips Corporation Apparatus for reading a record carrier in which information, for example video and/or audio information, is recorded in at least one track
NL7212044A (ja) * 1972-09-05 1974-03-07
US3919465A (en) * 1974-01-14 1975-11-11 Zenith Radio Corp Optical system for directly detecting spatially recorded signals
NL177157C (nl) * 1975-02-28 1985-08-01 Philips Nv Inrichting voor het uitlezen van een vlakke registratiedrager met een optisch uitleesbare informatiestruktuur.
US4065786A (en) * 1975-09-30 1977-12-27 Rca Corporation Videodisc playback system
FR2359476A1 (fr) * 1976-07-23 1978-02-17 Thomson Csf Procede de lecture optique d'un support d'information et lecteur optique mettant en oeuvre un tel procede de lecture

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5465007A (en) * 1977-11-02 1979-05-25 Matsushita Electric Ind Co Ltd Disc form recording carrier reader

Also Published As

Publication number Publication date
US4349901A (en) 1982-09-14
WO1982000067A1 (en) 1982-01-07
EP0054037A4 (en) 1982-11-08
EP0054037A1 (en) 1982-06-23

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