JPS57172306A - Focus controller of optical recording system - Google Patents

Focus controller of optical recording system

Info

Publication number
JPS57172306A
JPS57172306A JP5712681A JP5712681A JPS57172306A JP S57172306 A JPS57172306 A JP S57172306A JP 5712681 A JP5712681 A JP 5712681A JP 5712681 A JP5712681 A JP 5712681A JP S57172306 A JPS57172306 A JP S57172306A
Authority
JP
Japan
Prior art keywords
beam splitter
recording
executed
reflected
focus
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
JP5712681A
Other languages
Japanese (ja)
Other versions
JPS6367256B2 (en
Inventor
Toshiki Aoi
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP5712681A priority Critical patent/JPS57172306A/en
Priority to US06/362,983 priority patent/US4530080A/en
Publication of JPS57172306A publication Critical patent/JPS57172306A/en
Publication of JPS6367256B2 publication Critical patent/JPS6367256B2/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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0055—Erasing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
    • 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
    • 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
    • G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

Landscapes

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

Abstract

PURPOSE:To execute focus control which is large in S/N ratio and excellent in accuracy, by obtaining a focus controlling signal from a reflected beam of a beam which has irradiated the front part in the running direction, instead of a focus of the irradiation beam for recording and reproducing. CONSTITUTION:A beam from a laser 1 is converged on a point B on a recording layer 8 of a recording medium running in the direction as indicated with an arrow, through a collimator lens 2, an optical modulator 3, a beam splitter 4, a 1/4 wavelength plate 5, a dichroic mirror 6 and a condensing lens 7, and recording is executed. When reproducing, a reflected ray is reflected by the beam splitter 4, is made incident to a photodetector 9, and a reproducing signal is outputted. On the other hand, a beam from a laser 10 is converged on a point C on the recording layer 8 through a collimator lens 11, a beam splitter 12, a 1/4 wavelength plate 14, the dichroic mirror 6 and the condensing lens 7, and the reflected ray is made incident to a 1/2 split photodiode 14 through the beam splitter 12, and a focus control is executed. The focus control which is large in S/N ratio and excellent in accuracy is executed since it is not influenced by a recorded hole.
JP5712681A 1981-04-07 1981-04-17 Focus controller of optical recording system Granted JPS57172306A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5712681A JPS57172306A (en) 1981-04-17 1981-04-17 Focus controller of optical recording system
US06/362,983 US4530080A (en) 1981-04-07 1982-03-29 Optical recording/reproducing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5712681A JPS57172306A (en) 1981-04-17 1981-04-17 Focus controller of optical recording system

Publications (2)

Publication Number Publication Date
JPS57172306A true JPS57172306A (en) 1982-10-23
JPS6367256B2 JPS6367256B2 (en) 1988-12-23

Family

ID=13046864

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5712681A Granted JPS57172306A (en) 1981-04-07 1981-04-17 Focus controller of optical recording system

Country Status (1)

Country Link
JP (1) JPS57172306A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01151428U (en) * 1988-04-06 1989-10-19
JPH0460603A (en) * 1990-06-29 1992-02-26 Canon Inc Focus detector and observation device equipped with the same
CN101862912A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser drilling method
CN101862911A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser cutting method
CN101862902A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser welding method and device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01151428U (en) * 1988-04-06 1989-10-19
JPH0460603A (en) * 1990-06-29 1992-02-26 Canon Inc Focus detector and observation device equipped with the same
CN101862912A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser drilling method
CN101862911A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser cutting method
CN101862902A (en) * 2010-03-11 2010-10-20 广东海洋大学 Handheld laser welding method and device

Also Published As

Publication number Publication date
JPS6367256B2 (en) 1988-12-23

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