JPS59217237A - 焦点制御装置 - Google Patents

焦点制御装置

Info

Publication number
JPS59217237A
JPS59217237A JP58091717A JP9171783A JPS59217237A JP S59217237 A JPS59217237 A JP S59217237A JP 58091717 A JP58091717 A JP 58091717A JP 9171783 A JP9171783 A JP 9171783A JP S59217237 A JPS59217237 A JP S59217237A
Authority
JP
Japan
Prior art keywords
objective lens
focus
detecting
control device
gain
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
JP58091717A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0234092B2 (OSRAM
Inventor
Kazuo Hirasawa
和夫 平沢
Masanori Niwayama
庭山　正紀
Yasuhiro Kashiwagi
康弘 柏木
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP58091716A priority Critical patent/JPS59217236A/ja
Priority to JP58091717A priority patent/JPS59217237A/ja
Publication of JPS59217237A publication Critical patent/JPS59217237A/ja
Publication of JPH0234092B2 publication Critical patent/JPH0234092B2/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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • 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)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
JP58091717A 1983-05-23 1983-05-23 焦点制御装置 Granted JPS59217237A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP58091716A JPS59217236A (ja) 1983-05-23 1983-05-23 焦点制御装置
JP58091717A JPS59217237A (ja) 1983-05-23 1983-05-23 焦点制御装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58091716A JPS59217236A (ja) 1983-05-23 1983-05-23 焦点制御装置
JP58091717A JPS59217237A (ja) 1983-05-23 1983-05-23 焦点制御装置

Publications (2)

Publication Number Publication Date
JPS59217237A true JPS59217237A (ja) 1984-12-07
JPH0234092B2 JPH0234092B2 (OSRAM) 1990-08-01

Family

ID=26433164

Family Applications (2)

Application Number Title Priority Date Filing Date
JP58091717A Granted JPS59217237A (ja) 1983-05-23 1983-05-23 焦点制御装置
JP58091716A Granted JPS59217236A (ja) 1983-05-23 1983-05-23 焦点制御装置

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP58091716A Granted JPS59217236A (ja) 1983-05-23 1983-05-23 焦点制御装置

Country Status (1)

Country Link
JP (2) JPS59217237A (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63284602A (ja) * 1987-05-15 1988-11-21 Matsushita Electric Ind Co Ltd ル−プゲイン制御装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161725A (OSRAM) * 1974-11-27 1976-05-28 Nippon Musical Instruments Mfg

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5161725A (OSRAM) * 1974-11-27 1976-05-28 Nippon Musical Instruments Mfg

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63284602A (ja) * 1987-05-15 1988-11-21 Matsushita Electric Ind Co Ltd ル−プゲイン制御装置

Also Published As

Publication number Publication date
JPS6412015B2 (OSRAM) 1989-02-28
JPH0234092B2 (OSRAM) 1990-08-01
JPS59217236A (ja) 1984-12-07

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