JPS57212631A - Focus detector of optical information reproducing device - Google Patents

Focus detector of optical information reproducing device

Info

Publication number
JPS57212631A
JPS57212631A JP9685981A JP9685981A JPS57212631A JP S57212631 A JPS57212631 A JP S57212631A JP 9685981 A JP9685981 A JP 9685981A JP 9685981 A JP9685981 A JP 9685981A JP S57212631 A JPS57212631 A JP S57212631A
Authority
JP
Japan
Prior art keywords
sensors
shielding plates
intercepted
illuminate
behind
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
JP9685981A
Other languages
English (en)
Japanese (ja)
Other versions
JPS627610B2 (en, 2012
Inventor
Yasuo Hachi
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP9685981A priority Critical patent/JPS57212631A/ja
Publication of JPS57212631A publication Critical patent/JPS57212631A/ja
Publication of JPS627610B2 publication Critical patent/JPS627610B2/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
    • G11B7/0908—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)
JP9685981A 1981-06-23 1981-06-23 Focus detector of optical information reproducing device Granted JPS57212631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9685981A JPS57212631A (en) 1981-06-23 1981-06-23 Focus detector of optical information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9685981A JPS57212631A (en) 1981-06-23 1981-06-23 Focus detector of optical information reproducing device

Publications (2)

Publication Number Publication Date
JPS57212631A true JPS57212631A (en) 1982-12-27
JPS627610B2 JPS627610B2 (en, 2012) 1987-02-18

Family

ID=14176187

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9685981A Granted JPS57212631A (en) 1981-06-23 1981-06-23 Focus detector of optical information reproducing device

Country Status (1)

Country Link
JP (1) JPS57212631A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04248135A (ja) * 1990-05-31 1992-09-03 Samsung Electron Co Ltd 光学式ディスクドライブのフォーカスエラー検出装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05258234A (ja) * 1992-03-09 1993-10-08 Alps Electric Co Ltd 複合磁気ヘッド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04248135A (ja) * 1990-05-31 1992-09-03 Samsung Electron Co Ltd 光学式ディスクドライブのフォーカスエラー検出装置

Also Published As

Publication number Publication date
JPS627610B2 (en, 2012) 1987-02-18

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