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JPS5461503A - Detection of focal point - Google Patents

Detection of focal point

Info

Publication number
JPS5461503A
JPS5461503A JP12729777A JP12729777A JPS5461503A JP S5461503 A JPS5461503 A JP S5461503A JP 12729777 A JP12729777 A JP 12729777A JP 12729777 A JP12729777 A JP 12729777A JP S5461503 A JPS5461503 A JP S5461503A
Authority
JP
Japan
Prior art keywords
optical image
light flux
detecting
detection
focal point
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
JP12729777A
Other languages
English (en)
Other versions
JPS6019049B2 (ja
Inventor
Kenichi Oikami
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP12729777A priority Critical patent/JPS6019049B2/ja
Publication of JPS5461503A publication Critical patent/JPS5461503A/ja
Publication of JPS6019049B2 publication Critical patent/JPS6019049B2/ja
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
    • G11B7/09—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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP12729777A 1977-10-25 1977-10-25 焦点検出方法 Expired JPS6019049B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12729777A JPS6019049B2 (ja) 1977-10-25 1977-10-25 焦点検出方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12729777A JPS6019049B2 (ja) 1977-10-25 1977-10-25 焦点検出方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP7550486A Division JPS61239435A (ja) 1986-04-03 1986-04-03 焦点検出方法

Publications (2)

Publication Number Publication Date
JPS5461503A true JPS5461503A (en) 1979-05-17
JPS6019049B2 JPS6019049B2 (ja) 1985-05-14

Family

ID=14956469

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12729777A Expired JPS6019049B2 (ja) 1977-10-25 1977-10-25 焦点検出方法

Country Status (1)

Country Link
JP (1) JPS6019049B2 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152534A (ja) * 1983-02-18 1984-08-31 Mitsubishi Electric Corp 焦点検出装置
JPS61500337A (ja) * 1983-11-04 1986-02-27 マツクス−プランク−ゲゼルシヤフト、ツ−ル、フエルデルング、デル、ヴイツセンシヤフテン、アインゲトラ−ゲナ−、フエライン 結像光学装置のフォ−カシング状態を検出するための方法及び装置
JPS6192445A (ja) * 1985-10-04 1986-05-10 Matsushita Electric Ind Co Ltd 光デイスク装置用光検出器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152534A (ja) * 1983-02-18 1984-08-31 Mitsubishi Electric Corp 焦点検出装置
JPS61500337A (ja) * 1983-11-04 1986-02-27 マツクス−プランク−ゲゼルシヤフト、ツ−ル、フエルデルング、デル、ヴイツセンシヤフテン、アインゲトラ−ゲナ−、フエライン 結像光学装置のフォ−カシング状態を検出するための方法及び装置
JPS6192445A (ja) * 1985-10-04 1986-05-10 Matsushita Electric Ind Co Ltd 光デイスク装置用光検出器

Also Published As

Publication number Publication date
JPS6019049B2 (ja) 1985-05-14

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