JPS6070923U - 焦点誤差検出装置 - Google Patents

焦点誤差検出装置

Info

Publication number
JPS6070923U
JPS6070923U JP1983161697U JP16169783U JPS6070923U JP S6070923 U JPS6070923 U JP S6070923U JP 1983161697 U JP1983161697 U JP 1983161697U JP 16169783 U JP16169783 U JP 16169783U JP S6070923 U JPS6070923 U JP S6070923U
Authority
JP
Japan
Prior art keywords
photodetector
focus error
light
arithmetic circuit
receiving elements
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
JP1983161697U
Other languages
English (en)
Other versions
JPH0110750Y2 (ja
Inventor
賢二郎 浜中
野津　進作
勝春 佐藤
穂積 田中
Original Assignee
パイオニア株式会社
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 パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP1983161697U priority Critical patent/JPS6070923U/ja
Priority to US06/662,037 priority patent/US4663750A/en
Priority to DE19843438260 priority patent/DE3438260A1/de
Priority to GB08426517A priority patent/GB2150385B/en
Publication of JPS6070923U publication Critical patent/JPS6070923U/ja
Application granted granted Critical
Publication of JPH0110750Y2 publication Critical patent/JPH0110750Y2/ja
Granted 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
    • G11B7/094—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
    • G11B7/08—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)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【図面の簡単な説明】
第１図は光学式記録又は再生装置における光学系の模式
図、第２図は従来例を示す回路図、第３図ａ、　ｂ、　
ｃは光検出器の受光面上での光束形状を示す模式図、第
４図は本考案の一実施例を示す回路図、第５図は焦点ず
れに対する焦点誤差信号の変化を示す図、第６図は光検
出器の受光面上での光束中心がずれた場合を示す模式図
、第７図は第６図の状態における焦点ずれに対する焦点
誤差信号の変化を示す図、第８図は本考案の他の実施例
を示す回路図、第９図は光検出器の受光面上での極端な
光束の中心ずれを示す模式図である。 主要部分の符号の説明、１・・・光源、３・・・ビーム
スプリッタ、４・・・対物レンズ、７・・・シリンドリ
カルレンズ、８・・・光検出器、９．１０．１５・・・
加算器、１１．１４・・・減算器、１２．１３・・・乗
算器、　　□１６・・・除算器。

Claims (2)

    【実用新案登録請求の範囲】
  1. （１）はぼ直交する２本の直線を境界線として各々近接
    配置された４つの独立な受光素子からなる光検出器と、
    記録媒体の情報記録面を経た光束を前記光検出器の受光
    面に非点収束形態で導く光学系と、前記光検出器の４つ
    の受光素子の出力信号を演算する演算回路とを備え、前
    記演算回路の出力信号を焦点誤差信号とする焦点誤差検
    出装置であって、前記演算回路は、前記光検出器の受光
    面中心に関して対称な受光素子同士の出力信号を乗算し
    て１対の積信号を得る手段゛と、前記１対の積信号間の
    差信号を算出する手段とを備えたことを特徴とする焦点
    誤差検出袋゛　　　置。
  2. （２）前記演算回路は、前記４つの受光素子あ各出力信
    号を加算して和信号を得る手段と、前記和信号で前記差
    信号を除算する手段とを備えたことを特徴とする実用新
    案登録請求の範囲第１項記載の焦点誤差検出装置。
JP1983161697U 1983-10-19 1983-10-19 焦点誤差検出装置 Granted JPS6070923U (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1983161697U JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置
US06/662,037 US4663750A (en) 1983-10-19 1984-10-18 Focus error detection device for an optical recording/playing back system
DE19843438260 DE3438260A1 (de) 1983-10-19 1984-10-18 Fokussierungsfehlerdetektorvorrichtung fuer ein optisches aufzeichnungs- und wiedergabegeraet
GB08426517A GB2150385B (en) 1983-10-19 1984-10-19 Video disc focussing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1983161697U JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置

Publications (2)

Publication Number Publication Date
JPS6070923U true JPS6070923U (ja) 1985-05-20
JPH0110750Y2 JPH0110750Y2 (ja) 1989-03-28

Family

ID=15740140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1983161697U Granted JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置

Country Status (4)

Country Link
US (1) US4663750A (ja)
JP (1) JPS6070923U (ja)
DE (1) DE3438260A1 (ja)
GB (1) GB2150385B (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823330A (en) * 1985-02-04 1989-04-18 International Business Machines Corporation Focus servo loop off-set compensation
US4899327A (en) * 1985-02-04 1990-02-06 International Business Machines Corporation Focus servo loop correction
JPH0736233B2 (ja) * 1985-04-16 1995-04-19 オリンパス光学工業株式会社 光学的情報記録再生装置
EP0234594A3 (en) * 1986-02-28 1989-09-06 Kabushiki Kaisha Toshiba System capable of retrieving information from an optical memory
JPH0760527B2 (ja) * 1986-09-17 1995-06-28 パイオニア株式会社 光学式ピックアップ装置
JP2597560B2 (ja) * 1986-12-25 1997-04-09 株式会社東芝 情報処理装置
JPS648563A (en) * 1987-06-30 1989-01-12 Toshiba Corp Track counter
JPS6433779A (en) * 1987-07-30 1989-02-03 Toshiba Corp Track access device
US4942563A (en) * 1987-09-30 1990-07-17 Kabushiki Kaisha Toshiba Signal processing apparatus and method capable of providing precise digital data
JPH0827961B2 (ja) * 1987-11-11 1996-03-21 日本電気ホームエレクトロニクス株式会社 ホログラム式光ヘッドの光検出器
US4937440A (en) * 1989-08-29 1990-06-26 Hewlett-Packard Company System and method for beam farfield shift focus compensation
DE3936032A1 (de) * 1989-10-28 1991-05-02 Thomson Brandt Gmbh Fokusregelkreis
US5978329A (en) 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
CN1077715C (zh) 1995-12-06 2002-01-09 迪维安公司 聚焦控制的装置和方法
US5689485A (en) 1996-04-01 1997-11-18 Discovision Associates Tracking control apparatus and method
CN102980739B (zh) * 2012-10-30 2015-05-20 华中科技大学 基于四象限探测器的脉冲气体激光器腔内流场测量装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057833A (en) * 1974-10-03 1977-11-08 U.S. Philips Corporation Centering detection system for an apparatus for playing optically readable record carriers
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.
JPS5642060A (en) * 1979-09-14 1981-04-20 Kubota Ltd Building material
JPS58125241A (ja) * 1982-01-20 1983-07-26 Matsushita Electric Ind Co Ltd 光学記録再生装置
NL8200208A (nl) * 1982-01-21 1983-08-16 Philips Nv Inrichting voor het uitlezen van een schijfvormige registratiedrager.

Also Published As

Publication number Publication date
JPH0110750Y2 (ja) 1989-03-28
GB2150385B (en) 1987-06-17
US4663750A (en) 1987-05-05
DE3438260A1 (de) 1985-05-15
GB8426517D0 (en) 1984-11-28
GB2150385A (en) 1985-06-26

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