JPS57200948A - Optical information reader - Google Patents

Optical information reader

Info

Publication number
JPS57200948A
JPS57200948A JP8386081A JP8386081A JPS57200948A JP S57200948 A JPS57200948 A JP S57200948A JP 8386081 A JP8386081 A JP 8386081A JP 8386081 A JP8386081 A JP 8386081A JP S57200948 A JPS57200948 A JP S57200948A
Authority
JP
Japan
Prior art keywords
arm
control
yoke
permanent magnets
gimbals
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
JP8386081A
Other languages
Japanese (ja)
Inventor
Ei Yamada
Makoto Ohashi
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 JP8386081A priority Critical patent/JPS57200948A/en
Publication of JPS57200948A publication Critical patent/JPS57200948A/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
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To exercise focusing and tracking control with less control electric power by fixing a balance weight and a condenser lens at both ends of an arm supported by a gimbals, and causing unbalancing from a balancing point by the repulsive force of a separately provided magnet. CONSTITUTION:An arm 34 close to a rigid body is supported by a gimbals 33 having a 3 degree of freedom; a condenser lens 25 and movable permanent magnets 30 and 31 are provided at one end of the arm 34, and a balance weight 34 is equipped at the other end. On the magnetic pole surface of a yoke 45, permanent magnets 35 and 36 directed in such a way that they cause repulsion for the permanent magnets 30 and 31 are stuck. The arm 34 becomes stationary where they are balanced. Focusing control is performed by moving said balancing point by a control coil 29 wound around the yoke 45. Tracking control, on the other hand, is exercised by applying electromagnetic force to a permanent magnet 37 in the arm 34 by flowing a control current through a coil 40 wound around a yoke 44.
JP8386081A 1981-06-02 1981-06-02 Optical information reader Pending JPS57200948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8386081A JPS57200948A (en) 1981-06-02 1981-06-02 Optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8386081A JPS57200948A (en) 1981-06-02 1981-06-02 Optical information reader

Publications (1)

Publication Number Publication Date
JPS57200948A true JPS57200948A (en) 1982-12-09

Family

ID=13814426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8386081A Pending JPS57200948A (en) 1981-06-02 1981-06-02 Optical information reader

Country Status (1)

Country Link
JP (1) JPS57200948A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112322U (en) * 1983-01-13 1984-07-28 日本テクサ株式会社 Objective lens drive device
JPS6089838A (en) * 1983-10-24 1985-05-20 Asahi Optical Co Ltd Device for setting neutral position in track direction of objective lens driver in optical information recording and reproducing device
FR2556121A1 (en) * 1983-12-01 1985-06-07 Philips Nv ELECTRO-OPTICAL DEVICE FOR ELECTRODYNAMICALLY ADJUSTING THE POSITION OF A RADIATION SPOT
FR2649238A1 (en) * 1989-06-30 1991-01-04 Atg Sa DEVICE FOR ACCESSING AND SERVING OPTICAL DISK
EP1475791A2 (en) * 2003-05-01 2004-11-10 Systems Engineering Co. Ltd Optical pickup lens driving apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55146636A (en) * 1979-04-27 1980-11-15 Olympus Optical Co Ltd Objective lens driver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55146636A (en) * 1979-04-27 1980-11-15 Olympus Optical Co Ltd Objective lens driver

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112322U (en) * 1983-01-13 1984-07-28 日本テクサ株式会社 Objective lens drive device
JPS6089838A (en) * 1983-10-24 1985-05-20 Asahi Optical Co Ltd Device for setting neutral position in track direction of objective lens driver in optical information recording and reproducing device
FR2556121A1 (en) * 1983-12-01 1985-06-07 Philips Nv ELECTRO-OPTICAL DEVICE FOR ELECTRODYNAMICALLY ADJUSTING THE POSITION OF A RADIATION SPOT
FR2649238A1 (en) * 1989-06-30 1991-01-04 Atg Sa DEVICE FOR ACCESSING AND SERVING OPTICAL DISK
EP1475791A2 (en) * 2003-05-01 2004-11-10 Systems Engineering Co. Ltd Optical pickup lens driving apparatus
EP1475791A3 (en) * 2003-05-01 2006-03-01 System Engineers' Co. Ltd. Optical pickup lens driving apparatus

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