JPS6358321U - - Google Patents

Info

Publication number
JPS6358321U
JPS6358321U JP1986152109U JP15210986U JPS6358321U JP S6358321 U JPS6358321 U JP S6358321U JP 1986152109 U JP1986152109 U JP 1986152109U JP 15210986 U JP15210986 U JP 15210986U JP S6358321 U JPS6358321 U JP S6358321U
Authority
JP
Japan
Prior art keywords
region
light
photodetector
error signal
track
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.)
Granted
Application number
JP1986152109U
Other languages
English (en)
Other versions
JPH0626972Y2 (ja
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
Priority to JP1986152109U priority Critical patent/JPH0626972Y2/ja
Priority to GB8723200A priority patent/GB2196115B/en
Priority to DE19873733422 priority patent/DE3733422A1/de
Priority to US07/104,017 priority patent/US4815060A/en
Publication of JPS6358321U publication Critical patent/JPS6358321U/ja
Application granted granted Critical
Publication of JPH0626972Y2 publication Critical patent/JPH0626972Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B7/09—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
    • 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
    • G11B7/094—Methods and circuits for servo offset compensation
    • 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
    • G11B7/131—Arrangement of detectors in a multiple array
    • 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
    • G11B7/0901—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 track following only

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Description

【図面の簡単な説明】
第１図は本考案の光検出器の構成図、第２図は
その光学式ピツクアツプ装置の構成図、第３図は
従来の光検出器の構成図である。 １……光源、２……ビームスプリツタ、３……
対物レンズ、４……デイスク、５……円柱レンズ
、６……光検出器、１１乃至１４……領域、１５
乃至１８……加算回路、１９，２０……差動増幅
器。

Claims (1)

  1. 【実用新案登録請求の範囲】 光源と、該光源より発せられた光をデイスクに
    収束する対物レンズと、該デイスクにより反射さ
    れた該光を検出する、３つの平行な分割線により
    実質的に４分割された光検出器と、該光検出器へ
    入射される該光に非点収差を与える光学手段と、
    該光検出器の内側の第１の領域と第２の領域の出
    力を加算した信号と、外側の第３の領域と第４の
    領域の出力を加算した信号とからフオーカスエラ
    ー信号を生成する第１の差動増幅器と、該第１の
    領域と該第３の領域の少なくとも一方の出力と該
    第２の領域と該第４の領域の少なくとも一方の出
    力とからトラツキングエラー信号を生成する第２
    の差動増幅器とを備え、 該第１の領域と該第２の領域の幅は、合焦状態
    において該フオーカスエラー信号が零になるよう
    に定められているとともに、トラツクの進行方向
    は、該第１の領域と該第３の領域及び該第２の領
    域と該第４の領域における該トラツクの回折光に
    よる成分の差が零又は最も小さくなるように、該
    分割線に対して傾斜しており、トラツキングによ
    る該光の移動方向は該分割線と平行な方向である
    ことを特徴とする光学式ピツクアツプ装置。
JP1986152109U 1986-10-03 1986-10-03 光学式ピツクアツプ装置 Expired - Lifetime JPH0626972Y2 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1986152109U JPH0626972Y2 (ja) 1986-10-03 1986-10-03 光学式ピツクアツプ装置
GB8723200A GB2196115B (en) 1986-10-03 1987-10-02 Optical pickup device
DE19873733422 DE3733422A1 (de) 1986-10-03 1987-10-02 Optischer aufnehmer
US07/104,017 US4815060A (en) 1986-10-03 1987-10-05 Optical pickup device with tracking and focusing utilizing a photodetector having four regions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1986152109U JPH0626972Y2 (ja) 1986-10-03 1986-10-03 光学式ピツクアツプ装置

Publications (2)

Publication Number Publication Date
JPS6358321U true JPS6358321U (ja) 1988-04-19
JPH0626972Y2 JPH0626972Y2 (ja) 1994-07-20

Family

ID=15533251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1986152109U Expired - Lifetime JPH0626972Y2 (ja) 1986-10-03 1986-10-03 光学式ピツクアツプ装置

Country Status (4)

Country Link
US (1) US4815060A (ja)
JP (1) JPH0626972Y2 (ja)
DE (1) DE3733422A1 (ja)
GB (1) GB2196115B (ja)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2596545B2 (ja) * 1987-01-07 1997-04-02 パイオニア株式会社 焦点誤差検出装置及びこれに用いられる光検出器の受光領域幅の選定方法
GB8724575D0 (en) * 1987-10-20 1987-11-25 Renishaw Plc Focus detection system
EP0317224B1 (en) * 1987-11-17 1993-08-04 Matsushita Electric Industrial Co., Ltd. Focus detection system for an optical disk drive using photo sensor elements in the far field of information pits
JP2701324B2 (ja) * 1988-06-16 1998-01-21 ソニー株式会社 光学ヘッド装置
US5144614A (en) * 1988-10-29 1992-09-01 Sony Corporation Optical pickup device
JP2797345B2 (ja) * 1988-10-29 1998-09-17 ソニー株式会社 光ピックアップ装置及び光ディスク装置
JP2682087B2 (ja) * 1988-11-22 1997-11-26 ソニー株式会社 光学ピックアップ装置
JPH0770073B2 (ja) * 1989-08-04 1995-07-31 松下電器産業株式会社 光学ヘッド
EP0504300B1 (en) * 1989-12-04 1995-08-23 Deutsche Thomson-Brandt Gmbh A tracking system in an optical recording/reproducing device
US5097455A (en) * 1990-02-06 1992-03-17 Hewlett-Packard Company Enhanced focus sending in optical information storage systems
US5412634A (en) * 1990-02-16 1995-05-02 Deutsche Thomson-Brandt Gmbh Optical scanning device for a disc player including improved focusing apparatus
JPH0775081B2 (ja) * 1990-06-27 1995-08-09 パイオニア株式会社 光ピックアップ
US5233587A (en) * 1990-06-29 1993-08-03 Kabushiki Kaisha Toshiba Rotary-type optical head
US5434835A (en) * 1990-11-07 1995-07-18 Asahi Kogaku Kogyo Kabushiki Kaisha Optical disk apparatus
JPH04205728A (ja) * 1990-11-29 1992-07-27 Pioneer Electron Corp トラッキング誤差検出装置
US5278401A (en) * 1991-08-13 1994-01-11 Asahi Kogaku Kogyo Kabushiki Kaisha Optical disc apparatus having five light receiving areas for detecting focus error and tracking error
US5764619A (en) 1995-04-07 1998-06-09 Matsushita Electric Industrial Co., Ltd. Optical recording medium having two separate recording layers
US5777352A (en) * 1996-09-19 1998-07-07 Eastman Kodak Company Photodetector structure
TW336311B (en) * 1997-10-15 1998-07-11 Ind Tech Res Inst Method and device for focusing and tracking of an optical head
JP4036400B2 (ja) * 1998-03-20 2008-01-23 株式会社東芝 光ディスク装置
US20050238145A1 (en) * 2004-04-22 2005-10-27 Sbc Knowledge Ventures, L.P. User interface for "how to use" application of automated self service call center

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7706753A (nl) * 1977-03-23 1978-12-22 Philips Nv Inrichting voor het uitlezen van een optische stralingsreflekterende informatiedrager.
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
NL8202058A (nl) * 1982-05-19 1983-12-16 Philips Nv Opto-elektronisch fokusfout-detektiestelsel.
JPS60185230A (ja) * 1984-03-02 1985-09-20 Pioneer Electronic Corp 焦点誤差検出装置
JP2548106B2 (ja) * 1984-05-23 1996-10-30 ソニー株式会社 光学式デイスクプレ−ヤのトラツキング・サ−ボコントロ−ル装置
JPS618744A (ja) * 1984-06-22 1986-01-16 Fuji Photo Film Co Ltd 光デイスク装置のフオ−カス誤差検出装置
US4718052A (en) * 1984-10-01 1988-01-05 Mitsubishi Denki Kabushiki Kaisha Head assembly for optical disc
DE3640660A1 (de) * 1985-11-28 1987-06-04 Toshiba Kk Vorrichtung zur bestimmung der stellung eines objektivs
DE3679648D1 (de) * 1985-12-10 1991-07-11 Nec Corp Optischer kopf mit einem beugungsgitter zum richten von zwei oder mehreren gebeugten lichtstrahlen auf optische detektoren.

Also Published As

Publication number Publication date
DE3733422A1 (de) 1988-05-05
GB2196115B (en) 1990-07-25
GB2196115A (en) 1988-04-20
US4815060A (en) 1989-03-21
GB8723200D0 (en) 1987-11-04
JPH0626972Y2 (ja) 1994-07-20

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