JPS56165937A - Optical recorder and reproducer - Google Patents

Optical recorder and reproducer

Info

Publication number
JPS56165937A
JPS56165937A JP6940580A JP6940580A JPS56165937A JP S56165937 A JPS56165937 A JP S56165937A JP 6940580 A JP6940580 A JP 6940580A JP 6940580 A JP6940580 A JP 6940580A JP S56165937 A JPS56165937 A JP S56165937A
Authority
JP
Japan
Prior art keywords
lens
laser beam
reflecting mirror
mirror
turning radius
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
JP6940580A
Other languages
Japanese (ja)
Inventor
Yoshikazu Goto
Kanji Nishii
Shunji Harikae
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 JP6940580A priority Critical patent/JPS56165937A/en
Publication of JPS56165937A publication Critical patent/JPS56165937A/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
    • G11B7/094—Methods and circuits for servo offset compensation

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To eliminate the occurrence of the vignetting of lens of a laser beam on an objective lens by a reflecting mirror by locating the turning center of the reflecting mirror on the extension line of the reflection optical axis, and setting the turning radius thereof at the length approximately twice the optical path distance between the reflecting mirror and the objective lens. CONSTITUTION:The turning radius of a reflecting mirror 6 is set at the distance 2m about twice the optical path distance m between the reflecting mirror 6 and an objective lens 8. Now, when the mirror 6 turns by an angle phi and comes to the position 6', the incident angle of the laser beam to the lens 8 is 2phi. The laser beam irradiation position of the reflecting mirror 6 moves approximately to 2mphi. This results in that the laser beam reflected from the mirror 6 passes near the point O which is half the turning radius. Now, the lens 8 is located at the point O and this turns out that the laser beam passes always near the center of the lens 8, thereby eliminating the vignetting of lens of the laser beam owing to tracking.
JP6940580A 1980-05-23 1980-05-23 Optical recorder and reproducer Pending JPS56165937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6940580A JPS56165937A (en) 1980-05-23 1980-05-23 Optical recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6940580A JPS56165937A (en) 1980-05-23 1980-05-23 Optical recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS56165937A true JPS56165937A (en) 1981-12-19

Family

ID=13401653

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6940580A Pending JPS56165937A (en) 1980-05-23 1980-05-23 Optical recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS56165937A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189932A2 (en) * 1985-01-31 1986-08-06 Fujitsu Limited Track servo system for controllably projecting an optical beam to an optical disk
JPS6251313U (en) * 1985-09-18 1987-03-30
JPH0567915U (en) * 1992-02-24 1993-09-10 日本電気ホームエレクトロニクス株式会社 Optical head device
JPH05242516A (en) * 1992-02-27 1993-09-21 Fujitsu Ltd Optical disk device
US5651553A (en) * 1995-04-25 1997-07-29 Teikoku Piston Ring Co., Ltd. Antirotation structure for combined oil ring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189932A2 (en) * 1985-01-31 1986-08-06 Fujitsu Limited Track servo system for controllably projecting an optical beam to an optical disk
JPS6251313U (en) * 1985-09-18 1987-03-30
JPH0567915U (en) * 1992-02-24 1993-09-10 日本電気ホームエレクトロニクス株式会社 Optical head device
JPH05242516A (en) * 1992-02-27 1993-09-21 Fujitsu Ltd Optical disk device
US5651553A (en) * 1995-04-25 1997-07-29 Teikoku Piston Ring Co., Ltd. Antirotation structure for combined oil ring

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