JPS5737748A - Automatic focusing system of optical disk - Google Patents

Automatic focusing system of optical disk

Info

Publication number
JPS5737748A
JPS5737748A JP11446080A JP11446080A JPS5737748A JP S5737748 A JPS5737748 A JP S5737748A JP 11446080 A JP11446080 A JP 11446080A JP 11446080 A JP11446080 A JP 11446080A JP S5737748 A JPS5737748 A JP S5737748A
Authority
JP
Japan
Prior art keywords
light
varies
line sensor
automatic focusing
disk
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
JP11446080A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
Hideshi Kenjo
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 JP11446080A priority Critical patent/JPS5737748A/en
Publication of JPS5737748A publication Critical patent/JPS5737748A/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 which corresponds to its irradiation area, by causing reflected light from a disk to strike the CCD through an objective. CONSTITUTION:Reflected light from a disk 7 is incident to a line sensor 9 consisting of CCDs, etc., by way of an objective lens 6 and a half-mirror 5. According to the state of focusing of a light beam on the disk surface, the state of the light incident to the line sensor 9 varies and a light circle 20 also varies, so that the output (l) of the line sensor 9 varies. On the basis of the variations, a focus error signal for automatic focusing is generated. In the figure, a 23 is a level for the addressing of a light shielding body 17, and a 22 is a level generated by bias light.
JP11446080A 1980-08-19 1980-08-19 Automatic focusing system of optical disk Pending JPS5737748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11446080A JPS5737748A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11446080A JPS5737748A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Publications (1)

Publication Number Publication Date
JPS5737748A true JPS5737748A (en) 1982-03-02

Family

ID=14638285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11446080A Pending JPS5737748A (en) 1980-08-19 1980-08-19 Automatic focusing system of optical disk

Country Status (1)

Country Link
JP (1) JPS5737748A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165717A (en) * 1985-01-16 1986-07-26 Nec Corp Target alignment device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165717A (en) * 1985-01-16 1986-07-26 Nec Corp Target alignment device
JPH0473843B2 (en) * 1985-01-16 1992-11-24

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