BR8103377A - Aparelho para detectar o erro de foco de um feixe de energia radiante - Google Patents

Aparelho para detectar o erro de foco de um feixe de energia radiante

Info

Publication number
BR8103377A
BR8103377A BR8103377A BR8103377A BR8103377A BR 8103377 A BR8103377 A BR 8103377A BR 8103377 A BR8103377 A BR 8103377A BR 8103377 A BR8103377 A BR 8103377A BR 8103377 A BR8103377 A BR 8103377A
Authority
BR
Brazil
Prior art keywords
reflected
aperture
recording surface
focus
photodetector elements
Prior art date
Application number
BR8103377A
Other languages
English (en)
Inventor
John S Winslow
Original Assignee
Discovision Ass
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 Discovision Ass filed Critical Discovision Ass
Publication of BR8103377A publication Critical patent/BR8103377A/pt

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
    • 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
    • G11B7/0912—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 push-pull method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Automatic Focus Adjustment (AREA)
  • Eye Examination Apparatus (AREA)
  • Optical Head (AREA)
  • Electron Beam Exposure (AREA)
BR8103377A 1980-07-14 1981-05-29 Aparelho para detectar o erro de foco de um feixe de energia radiante BR8103377A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/168,812 US4357533A (en) 1980-07-14 1980-07-14 Focus detector for an optical disc playback system

Publications (1)

Publication Number Publication Date
BR8103377A true BR8103377A (pt) 1982-08-24

Family

ID=22613031

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8103377A BR8103377A (pt) 1980-07-14 1981-05-29 Aparelho para detectar o erro de foco de um feixe de energia radiante

Country Status (11)

Country Link
US (1) US4357533A (pt)
EP (1) EP0044074B1 (pt)
JP (1) JPS5732410A (pt)
KR (1) KR850001003B1 (pt)
AT (1) ATE9741T1 (pt)
AU (1) AU538975B2 (pt)
BR (1) BR8103377A (pt)
CA (1) CA1147860A (pt)
DE (1) DE3166473D1 (pt)
HK (1) HK51086A (pt)
MY (1) MY8600741A (pt)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567246A (en) * 1979-06-25 1981-01-24 Olympus Optical Co Ltd Method and unit for focus detection
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
EP0068390B1 (en) * 1981-06-22 1990-08-22 Kabushiki Kaisha Toshiba An optical head
US4412743A (en) * 1981-09-08 1983-11-01 Discovision Associates Off-axis light beam defect detector
US4538062A (en) * 1981-11-19 1985-08-27 Olympus Optical Co., Ltd. Focusing detecting device with coaxial source and detector
EP0095852A1 (en) * 1982-05-19 1983-12-07 BURROUGHS CORPORATION (a Michigan corporation) Focusing control circuitry for an optical memory system
US4559622A (en) * 1982-09-09 1985-12-17 Burroughs Corporation Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system
US4621353A (en) * 1982-09-09 1986-11-04 Burroughs Corporation Optical memory system providing improved focusing control and improved beam combining and separating apparatus
US4622659A (en) * 1982-09-09 1986-11-11 Burroughs Corporation Focus detection and control apparatus for maintaining accurate focusing in an optical memory system by detecting reflected beam diameter variations at spaced predetermined locations
JPS59125727U (ja) * 1983-02-15 1984-08-24 パイオニア株式会社 光学式情報ピツクアツプ装置
JPS59162514A (ja) * 1983-03-08 1984-09-13 Dainippon Screen Mfg Co Ltd 画像走査記録装置における焦点調整方法
US4705941A (en) * 1983-06-30 1987-11-10 Kabushiki Kaisha Toshiba Apparatus for detecting a focusing state of an optical system
DE3429382A1 (de) * 1983-08-10 1985-02-28 Canon K.K., Tokio/Tokyo Optischer kopf
NL8403034A (nl) * 1984-10-05 1986-05-01 Philips Nv Opto-elektronisch fokusfout-detektiestelsel.
JPS6282525A (ja) * 1985-10-08 1987-04-16 Toshiba Corp 光学ヘツド
WO1987002499A1 (en) * 1985-10-10 1987-04-23 Opticon Technology Incorporated Apparatus for recording and reading optical data marks on an optical medium
US4843603A (en) * 1988-03-11 1989-06-27 Optotech, Inc. Concentric photodetector arrangement for focusing and tracking
US5072437A (en) * 1988-09-19 1991-12-10 Pioneer Electronic Corporation Optical information reproducing apparatus
TW218427B (pt) * 1991-06-04 1994-01-01 Ibm
US5978329A (en) * 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
ES2112224T1 (es) * 1995-12-06 1998-04-01 Discovision Ass Aparato y metodo para control de foco.
US5689485A (en) 1996-04-01 1997-11-18 Discovision Associates Tracking control apparatus and method
FR2759208B1 (fr) * 1997-01-31 1999-05-07 Thomson Csf Dispositif de controle du pointage et de la focalisation des chaines laser sur une cible
US9234854B2 (en) * 2013-03-15 2016-01-12 International Business Machines Corporation Single fiber noncritical-alignment wafer-scale optical testing

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3454772A (en) * 1966-12-20 1969-07-08 Hughes Aircraft Co Photoelectric monitoring system for holding the object plane in proper focus
FR2222666B1 (pt) * 1973-03-19 1976-11-05 Thomson Brandt
JPS5016423A (pt) * 1973-06-11 1975-02-21
US3967110A (en) * 1973-09-21 1976-06-29 Corning Glass Works Automatic focusing system
JPS5091317A (pt) * 1973-12-12 1975-07-22
US3932700A (en) * 1974-02-04 1976-01-13 Zenith Radio Corporation Focus tracking registration for optical reproducing systems
JPS5250130B2 (pt) * 1974-02-20 1977-12-22
JPS5154432A (en) * 1974-11-07 1976-05-13 Asahi Optical Co Ltd Shotenkenshutsusochi
JPS51120725A (en) * 1975-04-16 1976-10-22 Sankyo Kogaku Kogyo Kk Automatic forcusing camera
JPS5238944A (en) * 1975-09-23 1977-03-25 Canon Inc Optical system for scanning
JPS53116852A (en) * 1977-03-23 1978-10-12 Olympus Optical Co Ltd Automatic focus adjusting system
US4220850A (en) * 1978-09-29 1980-09-02 Abbott Laboratories Bimodal autofocusing apparatus

Also Published As

Publication number Publication date
AU538975B2 (en) 1984-09-06
DE3166473D1 (en) 1984-11-08
AU7057481A (en) 1982-01-21
EP0044074A1 (en) 1982-01-20
CA1147860A (en) 1983-06-07
JPS5732410A (en) 1982-02-22
HK51086A (en) 1986-07-11
EP0044074B1 (en) 1984-10-03
KR850001003B1 (ko) 1985-07-15
US4357533A (en) 1982-11-02
MY8600741A (en) 1986-12-31
ATE9741T1 (de) 1984-10-15

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Legal Events

Date Code Title Description
MK Patent expired

Effective date: 19960529

RH Request refused