JPS57200950A - Optical recording information reader - Google Patents

Optical recording information reader

Info

Publication number
JPS57200950A
JPS57200950A JP56083882A JP8388281A JPS57200950A JP S57200950 A JPS57200950 A JP S57200950A JP 56083882 A JP56083882 A JP 56083882A JP 8388281 A JP8388281 A JP 8388281A JP S57200950 A JPS57200950 A JP S57200950A
Authority
JP
Japan
Prior art keywords
aspherical mirror
gimbals
optical system
reflected
optical recording
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
JP56083882A
Other languages
Japanese (ja)
Inventor
Junichi Maeno
Ei Yamada
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 JP56083882A priority Critical patent/JPS57200950A/en
Publication of JPS57200950A publication Critical patent/JPS57200950A/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
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G11B7/08576—Swinging-arm positioners
    • 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
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

PURPOSE:To eliminate spherical aberration and to facilitate the detachment of only an optical system from a movable part, by using an aspherical mirror as a reflecting mirror, and supporting an optical system constituted in one body by a gimbals. CONSTITUTION:Luminous flux from a light source 20 is made into a parallel beam by a collimation aspherical mirror 21, and the beam is passed through a polarizing beam splitter 22 and a lambda/4 plate 23 to obtain circularly or elliptically polarized light, which is reflected and condensed by a condensing aspherical mirror 24 to form an extremely small spot on a prescribed surface of an information recording medium 25. Its reflected beam passes through an astigmatism system of a convex lens 26 and a cylindrical lens 27 and focused on a photodetector 28. A housing 29 is fitted to an arm 30 and supported by a gimbals 31. A focusing and tracking driving means 33 exercises position control.
JP56083882A 1981-06-02 1981-06-02 Optical recording information reader Pending JPS57200950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083882A JPS57200950A (en) 1981-06-02 1981-06-02 Optical recording information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083882A JPS57200950A (en) 1981-06-02 1981-06-02 Optical recording information reader

Publications (1)

Publication Number Publication Date
JPS57200950A true JPS57200950A (en) 1982-12-09

Family

ID=13815022

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083882A Pending JPS57200950A (en) 1981-06-02 1981-06-02 Optical recording information reader

Country Status (1)

Country Link
JP (1) JPS57200950A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261831A (en) * 1988-08-26 1990-03-01 Mitsumi Electric Co Ltd Optical head
JPH0296621U (en) * 1989-01-20 1990-08-01

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0261831A (en) * 1988-08-26 1990-03-01 Mitsumi Electric Co Ltd Optical head
JPH0296621U (en) * 1989-01-20 1990-08-01

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