JPS5771529A - Movable lens for controlling focus - Google Patents

Movable lens for controlling focus

Info

Publication number
JPS5771529A
JPS5771529A JP14681780A JP14681780A JPS5771529A JP S5771529 A JPS5771529 A JP S5771529A JP 14681780 A JP14681780 A JP 14681780A JP 14681780 A JP14681780 A JP 14681780A JP S5771529 A JPS5771529 A JP S5771529A
Authority
JP
Japan
Prior art keywords
bobbin
lenses
springs
thin
optical path
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
JP14681780A
Other languages
Japanese (ja)
Inventor
Shiro Nakagawa
Toshiki Aoi
Akihiko Kuroiwa
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP14681780A priority Critical patent/JPS5771529A/en
Publication of JPS5771529A publication Critical patent/JPS5771529A/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
    • G11B7/0927—Electromechanical actuators for lens positioning for focusing only

Landscapes

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

Abstract

PURPOSE:To obtain high speed responsiveness, facilitate treatment of lead wires and make selection of arbitrary driving impedances possible by holding a thin-walled cylindrical magnetic material mounted with lenses in a bobbin having winding on the outside circumference by means of elastic bodies such as springs. CONSTITUTION:A thin-walled magnetic material 12 consisting of an Fe-Cr-Mo alloy is held oscillatably in the optical path direction by means of elastic holding bodies 14a-14d such as springs in a bobbin 10 made of plastics having windings 11 on the outside circumference. The material 12 has lenses 13a, 13b on both end faces and is magnetized in the optical path direction. Thereby, high speed responsiveness is obtained, the treatment of lead wires is made simple and the selection of arbitrary driving impedances is made possible.
JP14681780A 1980-10-22 1980-10-22 Movable lens for controlling focus Pending JPS5771529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14681780A JPS5771529A (en) 1980-10-22 1980-10-22 Movable lens for controlling focus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14681780A JPS5771529A (en) 1980-10-22 1980-10-22 Movable lens for controlling focus

Publications (1)

Publication Number Publication Date
JPS5771529A true JPS5771529A (en) 1982-05-04

Family

ID=15416195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14681780A Pending JPS5771529A (en) 1980-10-22 1980-10-22 Movable lens for controlling focus

Country Status (1)

Country Link
JP (1) JPS5771529A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000457A1 (en) * 1983-07-06 1985-01-31 Matsushita Electric Industrial Co., Ltd. Light pickup
US4868802A (en) * 1986-07-28 1989-09-19 Kabushiki Kaisha Toshiba Magnetooptic recording and erasing head which performs biasing, tracking and focusing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000457A1 (en) * 1983-07-06 1985-01-31 Matsushita Electric Industrial Co., Ltd. Light pickup
US4868802A (en) * 1986-07-28 1989-09-19 Kabushiki Kaisha Toshiba Magnetooptic recording and erasing head which performs biasing, tracking and focusing
US4984226A (en) * 1986-07-28 1991-01-08 Kabushiki Kaisha Toshiba Magnetoptic head for recording/erasing information using a cylindrical hollow permanent magnet

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