IT1000785B - Sistema ottico di riproduzione di una registrazione a pista di dif frazione - Google Patents

Sistema ottico di riproduzione di una registrazione a pista di dif frazione

Info

Publication number
IT1000785B
IT1000785B IT54579/73A IT5457973A IT1000785B IT 1000785 B IT1000785 B IT 1000785B IT 54579/73 A IT54579/73 A IT 54579/73A IT 5457973 A IT5457973 A IT 5457973A IT 1000785 B IT1000785 B IT 1000785B
Authority
IT
Italy
Prior art keywords
reproduction
optical system
track recording
dif fraction
dif
Prior art date
Application number
IT54579/73A
Other languages
English (en)
Original Assignee
Thomson Csf
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 claimed from FR7246189A external-priority patent/FR2212070A6/fr
Application filed by Thomson Csf filed Critical Thomson Csf
Application granted granted Critical
Publication of IT1000785B publication Critical patent/IT1000785B/it

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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements
IT54579/73A 1972-12-26 1973-12-24 Sistema ottico di riproduzione di una registrazione a pista di dif frazione IT1000785B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7246189A FR2212070A6 (it) 1972-08-25 1972-12-26

Publications (1)

Publication Number Publication Date
IT1000785B true IT1000785B (it) 1976-04-10

Family

ID=9109267

Family Applications (1)

Application Number Title Priority Date Filing Date
IT54579/73A IT1000785B (it) 1972-12-26 1973-12-24 Sistema ottico di riproduzione di una registrazione a pista di dif frazione

Country Status (4)

Country Link
US (1) US3909608A (it)
JP (3) JPS649654B2 (it)
CA (1) CA997603A (it)
IT (1) IT1000785B (it)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125860A (en) * 1975-06-16 1978-11-14 Nippon Telegraph And Telephone Public Corporation Reproducer for an eraseable videodisc
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
US4065786A (en) * 1975-09-30 1977-12-27 Rca Corporation Videodisc playback system
DE2660901C2 (it) * 1975-10-08 1988-04-14 Olympus Optical Co., Ltd., Tokio/Tokyo, Jp
FR2358797A1 (fr) * 1976-07-16 1978-02-10 Thomson Brandt Systeme de correction automatique du facteur de forme de l'onde porteuse issue de la lecture d'un support d'information
CA1091966A (en) * 1976-10-15 1980-12-23 Chiaki Kojima Apparatus for reading signals recorded on a record carrier
JPS5465007A (en) * 1977-11-02 1979-05-25 Matsushita Electric Ind Co Ltd Disc form recording carrier reader
US4271334A (en) * 1979-04-06 1981-06-02 Discovision Associates Apparatus for correcting for temperature-induced tracking errors in a system for recovering information from a recording disc
JPS5814332A (ja) * 1981-07-16 1983-01-27 Mitsubishi Electric Corp 光学式情報再生装置
AT373932B (de) * 1981-11-12 1984-03-12 Chemiefaser Lenzing Ag Verfahren zur aufarbeitung von gebrauchter aufschlussfluessikgeit sowie anlagen zur durchfuehrung dieses verfahrens
US4466088A (en) * 1981-12-21 1984-08-14 Burroughs Corporation Galvo position sensor for track selection in optical data disk system
US4556964A (en) * 1981-12-21 1985-12-03 Burroughs Corporation Technique for monitoring galvo angle
JPS5928253A (ja) * 1982-08-09 1984-02-14 Toshiba Corp デジタルデイスクプレ−ヤのサ−ボ回路
JPS59103210U (ja) * 1982-12-27 1984-07-11 日本無線株式会社 傾斜計
JPS62159357A (ja) * 1986-01-07 1987-07-15 Nec Corp 光学ヘツド
JPH04181522A (ja) * 1990-11-16 1992-06-29 Sony Corp 光ディスク装置
US5729334A (en) * 1992-03-10 1998-03-17 Van Ruyven; Lodewijk Johan Fraud-proof identification system
JPH06111334A (ja) * 1992-09-24 1994-04-22 Sony Corp 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
US5680386A (en) * 1993-12-23 1997-10-21 Thomson-Csf Optical method and system for writing/reading information on a recording medium
JP3318636B2 (ja) * 1994-03-31 2002-08-26 ソニー株式会社 サーボ装置、光ディスク再生装置
TW347899U (en) 1994-08-31 1998-12-11 Sony Corp Optical recording/reproducing device
FR2742911B1 (fr) * 1995-12-21 1998-02-06 Thomson Csf Support d'enregistrement/lecture optique d'informations et procede d'enregistrement
FR2787232B1 (fr) 1998-12-15 2001-02-23 Thomson Csf Disque d'enregistrement optique anti-piratage et procede de lecture d'un tel disque
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
FR2805071B1 (fr) 2000-02-11 2002-05-03 Moulage Plastique De L Ouest Disque optique protege contre la copie et procede de protection pour un tel disque
JP2012238367A (ja) 2011-05-13 2012-12-06 Hitachi Media Electoronics Co Ltd 光学ヘッド、光学ドライブ装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3198949A (en) * 1960-11-21 1965-08-03 F L Moseley Co Line following apparatus for a graphical recorder including symmetrical photocell arrangements
US3207904A (en) * 1962-04-09 1965-09-21 Western Electric Co Electro-optical article positioning system
US3715524A (en) * 1972-04-20 1973-02-06 Zenith Radio Corp Electro-optical groove tracking apparatus for video reproducing system

Also Published As

Publication number Publication date
JPH0214428A (ja) 1990-01-18
JPH0230093B2 (it) 1990-07-04
JPH041412B2 (it) 1992-01-13
US3909608A (en) 1975-09-30
CA997603A (en) 1976-09-28
JPS649654B2 (it) 1989-02-20
JPS4998113A (it) 1974-09-17
JPH02236827A (ja) 1990-09-19

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