JPH0534732B2 - - Google Patents

Info

Publication number
JPH0534732B2
JPH0534732B2 JP59072440A JP7244084A JPH0534732B2 JP H0534732 B2 JPH0534732 B2 JP H0534732B2 JP 59072440 A JP59072440 A JP 59072440A JP 7244084 A JP7244084 A JP 7244084A JP H0534732 B2 JPH0534732 B2 JP H0534732B2
Authority
JP
Japan
Prior art keywords
photodetector
recording medium
light
optical recording
photodetectors
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.)
Expired - Lifetime
Application number
JP59072440A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60217535A (ja
Inventor
Keiji Maruta
Satoru Hineno
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP7244084A priority Critical patent/JPS60217535A/ja
Publication of JPS60217535A publication Critical patent/JPS60217535A/ja
Publication of JPH0534732B2 publication Critical patent/JPH0534732B2/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

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP7244084A 1984-04-11 1984-04-11 フオ−カス検出装置 Granted JPS60217535A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7244084A JPS60217535A (ja) 1984-04-11 1984-04-11 フオ−カス検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7244084A JPS60217535A (ja) 1984-04-11 1984-04-11 フオ−カス検出装置

Publications (2)

Publication Number Publication Date
JPS60217535A JPS60217535A (ja) 1985-10-31
JPH0534732B2 true JPH0534732B2 (fr) 1993-05-24

Family

ID=13489349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7244084A Granted JPS60217535A (ja) 1984-04-11 1984-04-11 フオ−カス検出装置

Country Status (1)

Country Link
JP (1) JPS60217535A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823331A (en) * 1986-02-24 1989-04-18 Sony Corporation Focusing detection apparatus
JPS63225927A (ja) * 1987-03-13 1988-09-20 Pioneer Electronic Corp 焦点誤差検出装置
JP2701324B2 (ja) * 1988-06-16 1998-01-21 ソニー株式会社 光学ヘッド装置
JPH10116427A (ja) * 1996-10-09 1998-05-06 Sony Corp サーボ信号処理装置及び光ディスク装置
US7138200B1 (en) 1997-12-18 2006-11-21 Toyota Jidosha Kabushiki Kaisha Fuel cell and separator for the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53112705A (en) * 1977-03-14 1978-10-02 Mitsubishi Electric Corp Optical system information reproducer
JPS58211721A (ja) * 1982-06-04 1983-12-09 Olympus Optical Co Ltd 合焦検出方法
JPS6043234A (ja) * 1983-08-18 1985-03-07 Mitsubishi Electric Corp 光デイスクヘツドのフオ−カスずれ検出装置
JPS60171643A (ja) * 1984-02-17 1985-09-05 Mitsubishi Electric Corp 光デイスクヘツドのフオ−カスずれ検出装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56152941U (fr) * 1980-04-14 1981-11-16

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53112705A (en) * 1977-03-14 1978-10-02 Mitsubishi Electric Corp Optical system information reproducer
JPS58211721A (ja) * 1982-06-04 1983-12-09 Olympus Optical Co Ltd 合焦検出方法
JPS6043234A (ja) * 1983-08-18 1985-03-07 Mitsubishi Electric Corp 光デイスクヘツドのフオ−カスずれ検出装置
JPS60171643A (ja) * 1984-02-17 1985-09-05 Mitsubishi Electric Corp 光デイスクヘツドのフオ−カスずれ検出装置

Also Published As

Publication number Publication date
JPS60217535A (ja) 1985-10-31

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