JPS54107708A - Optical information recorder - Google Patents

Optical information recorder

Info

Publication number
JPS54107708A
JPS54107708A JP1416578A JP1416578A JPS54107708A JP S54107708 A JPS54107708 A JP S54107708A JP 1416578 A JP1416578 A JP 1416578A JP 1416578 A JP1416578 A JP 1416578A JP S54107708 A JPS54107708 A JP S54107708A
Authority
JP
Japan
Prior art keywords
disc
focal position
detecting
recording
subjected
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
JP1416578A
Other languages
Japanese (ja)
Inventor
Shigeo Tsuji
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1416578A priority Critical patent/JPS54107708A/en
Publication of JPS54107708A publication Critical patent/JPS54107708A/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

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform recording in high density by providing means of detecting the reflected light from a recording medium through projection of a focal position detecting light beam, detecting the focal position of a recording beam and performing its focal position controlling. CONSTITUTION:The focal position detecting beam radiated onto a disc 11 is subjected to reflection by a disc 11 and turns back in the original optical path but it is subjected to rotation of 90 deg. to the plane of polarization of incident light by a 1/4 wavelength plate 26, passes through a beam splitter 25 and is received in a photo detector 28. Detectors 28', 28'' are placed in the positions deviated from the optical axis. When the disc 11 is in the accurate position A, the beam such as the one shown in A'' is projected to the detector 28. The outputs of the photo detectors are compensation-amplified with a servo amplifier 30 and drive a moving coil 18 to perform feedback-controlling so that the recording beam focuses on the disc 11 with the minimum beam diameter.
JP1416578A 1978-02-13 1978-02-13 Optical information recorder Pending JPS54107708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1416578A JPS54107708A (en) 1978-02-13 1978-02-13 Optical information recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1416578A JPS54107708A (en) 1978-02-13 1978-02-13 Optical information recorder

Publications (1)

Publication Number Publication Date
JPS54107708A true JPS54107708A (en) 1979-08-23

Family

ID=11853523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1416578A Pending JPS54107708A (en) 1978-02-13 1978-02-13 Optical information recorder

Country Status (1)

Country Link
JP (1) JPS54107708A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573230A (en) * 1980-06-06 1982-01-08 Nippon Telegr & Teleph Corp <Ntt> Recorder and reproducer for optical information
JPH0273541A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Manufacture of optical disk
KR100676876B1 (en) 2005-12-22 2007-02-02 주식회사 대우일렉트로닉스 Apparatus for reproducing optical information, apparatus for recoding/reproducing optical information and method of reproducing optical information using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573230A (en) * 1980-06-06 1982-01-08 Nippon Telegr & Teleph Corp <Ntt> Recorder and reproducer for optical information
JPH0273541A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Manufacture of optical disk
KR100676876B1 (en) 2005-12-22 2007-02-02 주식회사 대우일렉트로닉스 Apparatus for reproducing optical information, apparatus for recoding/reproducing optical information and method of reproducing optical information using the same

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