JPS51135667A - Beam spot size control device - Google Patents

Beam spot size control device

Info

Publication number
JPS51135667A
JPS51135667A JP50060715A JP6071575A JPS51135667A JP S51135667 A JPS51135667 A JP S51135667A JP 50060715 A JP50060715 A JP 50060715A JP 6071575 A JP6071575 A JP 6071575A JP S51135667 A JPS51135667 A JP S51135667A
Authority
JP
Japan
Prior art keywords
beam spot
control device
spot size
size control
size
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
JP50060715A
Other languages
Japanese (ja)
Other versions
JPS5918773B2 (en
Inventor
Tomio Yoshida
Masahiro Deguchi
Koji Matsushima
Akifumi Nakada
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP50060715A priority Critical patent/JPS5918773B2/en
Publication of JPS51135667A publication Critical patent/JPS51135667A/en
Publication of JPS5918773B2 publication Critical patent/JPS5918773B2/en
Expired 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To provide a device of detecting the size of the reflected light of beam spot and sensing and controlling the distance between the projecting optical system and the recording-reproducing medium face to assure keeping the size of beam spot unchanged.
JP50060715A 1975-05-20 1975-05-20 Optical spot size control device Expired JPS5918773B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50060715A JPS5918773B2 (en) 1975-05-20 1975-05-20 Optical spot size control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50060715A JPS5918773B2 (en) 1975-05-20 1975-05-20 Optical spot size control device

Publications (2)

Publication Number Publication Date
JPS51135667A true JPS51135667A (en) 1976-11-24
JPS5918773B2 JPS5918773B2 (en) 1984-04-28

Family

ID=13150253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50060715A Expired JPS5918773B2 (en) 1975-05-20 1975-05-20 Optical spot size control device

Country Status (1)

Country Link
JP (1) JPS5918773B2 (en)

Also Published As

Publication number Publication date
JPS5918773B2 (en) 1984-04-28

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