DE3200778C2 - Optische Wiedergabevorrichtung zum Auslesen von Information von einem rotierenden Aufzeichnungsmedium mittels eines gesteuerten Lichtstrahls - Google Patents

Optische Wiedergabevorrichtung zum Auslesen von Information von einem rotierenden Aufzeichnungsmedium mittels eines gesteuerten Lichtstrahls

Info

Publication number
DE3200778C2
DE3200778C2 DE3200778A DE3200778A DE3200778C2 DE 3200778 C2 DE3200778 C2 DE 3200778C2 DE 3200778 A DE3200778 A DE 3200778A DE 3200778 A DE3200778 A DE 3200778A DE 3200778 C2 DE3200778 C2 DE 3200778C2
Authority
DE
Germany
Prior art keywords
circuit
output
winding
signal
bridge
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
Application number
DE3200778A
Other languages
German (de)
English (en)
Other versions
DE3200778A1 (de
Inventor
Tadashi Ebina Kanagawa Motoyama
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
Publication of DE3200778A1 publication Critical patent/DE3200778A1/de
Application granted granted Critical
Publication of DE3200778C2 publication Critical patent/DE3200778C2/de
Expired 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
DE3200778A 1981-01-14 1982-01-13 Optische Wiedergabevorrichtung zum Auslesen von Information von einem rotierenden Aufzeichnungsmedium mittels eines gesteuerten Lichtstrahls Expired DE3200778C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56004165A JPS57120237A (en) 1981-01-14 1981-01-14 Optical reproducing device

Publications (2)

Publication Number Publication Date
DE3200778A1 DE3200778A1 (de) 1982-12-09
DE3200778C2 true DE3200778C2 (de) 1983-10-06

Family

ID=11577124

Family Applications (1)

Application Number Title Priority Date Filing Date
DE3200778A Expired DE3200778C2 (de) 1981-01-14 1982-01-13 Optische Wiedergabevorrichtung zum Auslesen von Information von einem rotierenden Aufzeichnungsmedium mittels eines gesteuerten Lichtstrahls

Country Status (7)

Country Link
US (1) US4426690A (enExample)
JP (1) JPS57120237A (enExample)
CA (1) CA1191949A (enExample)
DE (1) DE3200778C2 (enExample)
FR (1) FR2497989A1 (enExample)
GB (1) GB2093611B (enExample)
NL (1) NL8200143A (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155527A (ja) * 1982-03-10 1983-09-16 Hitachi Ltd 光デイスクプレ−ヤのフオ−カス引き込み回路
EP0095852A1 (en) * 1982-05-19 1983-12-07 BURROUGHS CORPORATION (a Michigan corporation) Focusing control circuitry for an optical memory system
JPS59140642A (ja) * 1983-01-31 1984-08-13 Canon Inc トラツキングエラ−信号検出装置
JPS6134734A (ja) * 1984-07-25 1986-02-19 Sony Corp 光学式デイスクプレ−ヤ
JP2004185741A (ja) * 2002-12-04 2004-07-02 Mitsubishi Electric Corp 光学式ディスク装置
US7137775B2 (en) * 2003-03-20 2006-11-21 Huntair Inc. Fan array fan section in air-handling systems
KR100520508B1 (ko) * 2003-09-27 2005-10-11 삼성전자주식회사 포커스 인입 장치 및 방법
US7408728B2 (en) * 2006-12-04 2008-08-05 Quality Vision International, Inc. System and method for focal length stabilization using active temperature control
US10361554B1 (en) * 2016-09-27 2019-07-23 Altera Corporation Techniques for determining inductances

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7401805A (nl) 1974-02-09 1975-08-12 Philips Nv Inrichting voor het instellen van het beeld en informatiestruktuur op een omzetter.
NL182257C (nl) * 1974-12-23 1988-02-01 Philips Nv Inrichting voor het uitlezen van een vlakke reflekterende registratiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur.
FR2330062A1 (fr) 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
GB2027881B (en) * 1978-07-19 1983-04-27 Universal Pioneer Corp In-focus detecting device
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader
FR2458126A1 (fr) 1979-05-31 1980-12-26 Thomson Brandt Systeme de commande de changement de face lue pour un lecteur optique de support d'information et lecteur optique comportant un tel systeme
JPS6048809B2 (ja) 1979-10-16 1985-10-29 パイオニアビデオ株式会社 情報読取装置におけるトラッキングサ−ボ引込装置
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo

Also Published As

Publication number Publication date
JPS57120237A (en) 1982-07-27
GB2093611A (en) 1982-09-02
DE3200778A1 (de) 1982-12-09
NL8200143A (nl) 1982-08-02
US4426690A (en) 1984-01-17
GB2093611B (en) 1984-09-19
FR2497989B1 (enExample) 1985-05-10
CA1191949A (en) 1985-08-13
FR2497989A1 (fr) 1982-07-16

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8126 Change of the secondary classification

Ipc: ENTFAELLT

D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee