JPS5737747A - Automatic focusing system of optical disk - Google Patents

Automatic focusing system of optical disk

Info

Publication number
JPS5737747A
JPS5737747A JP11445980A JP11445980A JPS5737747A JP S5737747 A JPS5737747 A JP S5737747A JP 11445980 A JP11445980 A JP 11445980A JP 11445980 A JP11445980 A JP 11445980A JP S5737747 A JPS5737747 A JP S5737747A
Authority
JP
Japan
Prior art keywords
optical axis
reflected light
disk
automatic focusing
focusing
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.)
Pending
Application number
JP11445980A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
Tsutomu Shibata
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 JP11445980A priority Critical patent/JPS5737747A/en
Publication of JPS5737747A publication Critical patent/JPS5737747A/en
Pending 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)

Abstract

PURPOSE:To obtain focus information on the basis of the output of a CCD obtained by focusing reflected light from a disk upon a CCD surface extending in the direction of the optical axis of the reflected light as inclined to the optical axis. CONSTITUTION:Reflected light from a disk is focused by a condenser 9 on a CCD12 and a CCD12' surfaces extending in the direction of the optical axis of the reflected light inclined at a small angle to the optical axis. Focusing positions 13-15 shift according to the distance between the disk and said optical system and the output width 22 of the CCDs varies accordingly. On the basis of the signal, a focus error signal for automatic focusing is generated. In the figure, a 26 is a level for the addressing of light shielding bodies 18 and 18', and a 27 is a level generated by bias light.
JP11445980A 1980-08-19 1980-08-19 Automatic focusing system of optical disk Pending JPS5737747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11445980A JPS5737747A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11445980A JPS5737747A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Publications (1)

Publication Number Publication Date
JPS5737747A true JPS5737747A (en) 1982-03-02

Family

ID=14638258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11445980A Pending JPS5737747A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Country Status (1)

Country Link
JP (1) JPS5737747A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988172U (en) * 1982-12-03 1984-06-14 株式会社インテリア−ナ sliding door lock device
JPS63108972U (en) * 1986-12-29 1988-07-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988172U (en) * 1982-12-03 1984-06-14 株式会社インテリア−ナ sliding door lock device
JPS63108972U (en) * 1986-12-29 1988-07-13
JPH0454287Y2 (en) * 1986-12-29 1992-12-21

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