JPS54103306A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS54103306A
JPS54103306A JP1021678A JP1021678A JPS54103306A JP S54103306 A JPS54103306 A JP S54103306A JP 1021678 A JP1021678 A JP 1021678A JP 1021678 A JP1021678 A JP 1021678A JP S54103306 A JPS54103306 A JP S54103306A
Authority
JP
Japan
Prior art keywords
light source
phase
output
disc
lens
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
JP1021678A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6227455B2 (enrdf_load_stackoverflow
Inventor
Kazuo Okada
Mitsushige Kondo
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 JP1021678A priority Critical patent/JPS54103306A/ja
Priority to NL7812058A priority patent/NL186121C/xx
Priority to DE7979900037T priority patent/DE2862256D1/de
Priority to PCT/JP1978/000052 priority patent/WO1979000400A1/ja
Priority to EP79900037A priority patent/EP0007902B1/en
Publication of JPS54103306A publication Critical patent/JPS54103306A/ja
Publication of JPS6227455B2 publication Critical patent/JPS6227455B2/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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP1021678A 1977-12-16 1978-01-31 Automatic focusing device Granted JPS54103306A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1021678A JPS54103306A (en) 1978-01-31 1978-01-31 Automatic focusing device
NL7812058A NL186121C (nl) 1977-12-16 1978-12-12 Automatisch focusseerapparaat.
DE7979900037T DE2862256D1 (en) 1977-12-16 1978-12-13 Automatic focusing system
PCT/JP1978/000052 WO1979000400A1 (en) 1977-12-16 1978-12-13 Automatic focusing system
EP79900037A EP0007902B1 (en) 1977-12-16 1979-07-16 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1021678A JPS54103306A (en) 1978-01-31 1978-01-31 Automatic focusing device

Publications (2)

Publication Number Publication Date
JPS54103306A true JPS54103306A (en) 1979-08-14
JPS6227455B2 JPS6227455B2 (enrdf_load_stackoverflow) 1987-06-15

Family

ID=11744063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1021678A Granted JPS54103306A (en) 1977-12-16 1978-01-31 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS54103306A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity

Also Published As

Publication number Publication date
JPS6227455B2 (enrdf_load_stackoverflow) 1987-06-15

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