JPS57100629A - Focal point controller - Google Patents

Focal point controller

Info

Publication number
JPS57100629A
JPS57100629A JP17583480A JP17583480A JPS57100629A JP S57100629 A JPS57100629 A JP S57100629A JP 17583480 A JP17583480 A JP 17583480A JP 17583480 A JP17583480 A JP 17583480A JP S57100629 A JPS57100629 A JP S57100629A
Authority
JP
Japan
Prior art keywords
coils
arrow
electricity
fed
cylindrical body
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
JP17583480A
Other languages
Japanese (ja)
Inventor
Toshihiko Goto
Hideo Onuki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP17583480A priority Critical patent/JPS57100629A/en
Publication of JPS57100629A publication Critical patent/JPS57100629A/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

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To move an optical system in >=2 directions while holding the direction of its optical axis constant, by arranging a couple of semicircle magnets while different poles face mutually, and by providing flat coils in two mutually-orthogonal magnetic gaps. CONSTITUTION:A magnetic circuit consisting of a magnet 5 and yokes 6 and 7 and another magnetic circuit consisting of a magnet 9 having different polarity with said magnet, and yokes 10 and 11 are arranged facing each other, and in their gaps coils 23 and 24 fixed in the center of a cylindrical body 21 equipped with an objective lens 22 are arranged. The coil 23 is fed with electricity as shown by an arrow A to move the cylindrical body 21 in a z-axis direction together with the coil 23, and the coil 24 is fed with electricity as shown by an arrow B to move the cylindrical body in a y-axis direction. At projection parts of the coils 23 and 24, coils 25-28 are arranged, and the coils 25 and 26 are fed with electricity as shown by an arrow C, and the coils 27 and 28 are also fed with electricity as shown by an arrow D, displacing the cylindrical body 21 in an x-axis direction. Consequently, an optical system 22 is moved in >=2 directions while its optical axis is held constant.
JP17583480A 1980-12-15 1980-12-15 Focal point controller Pending JPS57100629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17583480A JPS57100629A (en) 1980-12-15 1980-12-15 Focal point controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17583480A JPS57100629A (en) 1980-12-15 1980-12-15 Focal point controller

Publications (1)

Publication Number Publication Date
JPS57100629A true JPS57100629A (en) 1982-06-22

Family

ID=16003026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17583480A Pending JPS57100629A (en) 1980-12-15 1980-12-15 Focal point controller

Country Status (1)

Country Link
JP (1) JPS57100629A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008140437A (en) * 2006-11-30 2008-06-19 Konica Minolta Opto Inc Lens drive unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008140437A (en) * 2006-11-30 2008-06-19 Konica Minolta Opto Inc Lens drive unit

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