JPS55101142A - Focus detection unit of optical reproducing device - Google Patents

Focus detection unit of optical reproducing device

Info

Publication number
JPS55101142A
JPS55101142A JP902879A JP902879A JPS55101142A JP S55101142 A JPS55101142 A JP S55101142A JP 902879 A JP902879 A JP 902879A JP 902879 A JP902879 A JP 902879A JP S55101142 A JPS55101142 A JP S55101142A
Authority
JP
Japan
Prior art keywords
condenser lens
disc
interval
photo
many
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
JP902879A
Other languages
English (en)
Inventor
Tadao Nagai
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.)
Teac Corp
Original Assignee
Teac 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 Teac Corp filed Critical Teac Corp
Priority to JP902879A priority Critical patent/JPS55101142A/ja
Publication of JPS55101142A publication Critical patent/JPS55101142A/ja
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)
  • Automatic Focus Adjustment (AREA)
JP902879A 1979-01-29 1979-01-29 Focus detection unit of optical reproducing device Pending JPS55101142A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP902879A JPS55101142A (en) 1979-01-29 1979-01-29 Focus detection unit of optical reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP902879A JPS55101142A (en) 1979-01-29 1979-01-29 Focus detection unit of optical reproducing device

Publications (1)

Publication Number Publication Date
JPS55101142A true JPS55101142A (en) 1980-08-01

Family

ID=11709194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP902879A Pending JPS55101142A (en) 1979-01-29 1979-01-29 Focus detection unit of optical reproducing device

Country Status (1)

Country Link
JP (1) JPS55101142A (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131433U (ja) * 1982-03-02 1983-09-05 ナカミチ株式会社 光学式レコ−ド再生装置
JPS60211644A (ja) * 1984-04-04 1985-10-24 Nec Corp 光学式位置検出方法及びその装置
JPS61165717A (ja) * 1985-01-16 1986-07-26 Nec Corp タ−ゲツトアラインメント装置
EP0317224A2 (en) * 1987-11-17 1989-05-24 Matsushita Electric Industrial Co., Ltd. Focus detection system for an optical disk drive using photo sensor elements in the far field of information pits
US5146445A (en) * 1989-08-04 1992-09-08 Matsushita Electric Industrial Co., Ltd. Optical head with tracking error detecting system
JP2008185581A (ja) * 2006-12-08 2008-08-14 Asml Netherlands Bv スキャトロメータ、リソグラフィ装置、及び、フォーカス分析方法
JP2011005265A (ja) * 2002-08-05 2011-01-13 Resmed Ltd 非伸張性ヘッドギアおよびｃｐａｐまたはこれらを備えたベンチレータ・マスク

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131433U (ja) * 1982-03-02 1983-09-05 ナカミチ株式会社 光学式レコ−ド再生装置
JPH0452810Y2 (ja) * 1982-03-02 1992-12-11
JPS60211644A (ja) * 1984-04-04 1985-10-24 Nec Corp 光学式位置検出方法及びその装置
JPS61165717A (ja) * 1985-01-16 1986-07-26 Nec Corp タ−ゲツトアラインメント装置
JPH0473843B2 (ja) * 1985-01-16 1992-11-24
EP0317224A2 (en) * 1987-11-17 1989-05-24 Matsushita Electric Industrial Co., Ltd. Focus detection system for an optical disk drive using photo sensor elements in the far field of information pits
US5146445A (en) * 1989-08-04 1992-09-08 Matsushita Electric Industrial Co., Ltd. Optical head with tracking error detecting system
JP2011005265A (ja) * 2002-08-05 2011-01-13 Resmed Ltd 非伸張性ヘッドギアおよびｃｐａｐまたはこれらを備えたベンチレータ・マスク
JP2008185581A (ja) * 2006-12-08 2008-08-14 Asml Netherlands Bv スキャトロメータ、リソグラフィ装置、及び、フォーカス分析方法
JP4660533B2 (ja) * 2006-12-08 2011-03-30 エーエスエムエル ネザーランズ ビー．ブイ． スキャトロメータ、及びフォーカス分析方法

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