JPS57191838A - Objective lens driver - Google Patents

Objective lens driver

Info

Publication number
JPS57191838A
JPS57191838A JP7503281A JP7503281A JPS57191838A JP S57191838 A JPS57191838 A JP S57191838A JP 7503281 A JP7503281 A JP 7503281A JP 7503281 A JP7503281 A JP 7503281A JP S57191838 A JPS57191838 A JP S57191838A
Authority
JP
Japan
Prior art keywords
objective lens
yoke
pole
coils
magnet
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
JP7503281A
Other languages
Japanese (ja)
Inventor
Takahiro Kato
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP7503281A priority Critical patent/JPS57191838A/en
Publication of JPS57191838A publication Critical patent/JPS57191838A/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

Abstract

PURPOSE:To obtain a small-sized, lightweight and simplified structure and to improve efficiency by forming a magnetic gap between a fixed coil and a movable part which includes an annular magnet and an objective lens, and supporting the movable part by a coil spring. CONSTITUTION:For example, when a magnet 1 is magnetized to have an N pole at the upper part and an S pole at the lower part, a flow 1a of magnetic flux crosses a bobbin 6 and an electromagnetic coil 7 through the magnet 1 and a yoke 2, reaches a yoke 9, and then return to the S pole through an electromagnetic coil 8, the bobbin 6, and a yoke 3. When currents flow through the electromagnetic coils 7 and 8 wound in said magnetic circuit in such a way that the current flow in the opposite directions, those two coils generate equal forces in the axis direction 4a. Since the coils 7 and 8 are fixed, an objective lens 4 moves in the axial direction by reaction to perform stable driving by a coil spring 10, and the size and weight are reduced; and the efficiency is improved and the structure is simplified.
JP7503281A 1981-05-20 1981-05-20 Objective lens driver Pending JPS57191838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7503281A JPS57191838A (en) 1981-05-20 1981-05-20 Objective lens driver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7503281A JPS57191838A (en) 1981-05-20 1981-05-20 Objective lens driver

Publications (1)

Publication Number Publication Date
JPS57191838A true JPS57191838A (en) 1982-11-25

Family

ID=13564434

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7503281A Pending JPS57191838A (en) 1981-05-20 1981-05-20 Objective lens driver

Country Status (1)

Country Link
JP (1) JPS57191838A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103929A2 (en) * 1982-09-16 1984-03-28 Philips Patentverwaltung GmbH Optical unit for guidance and alignment of a radiator beam
TR24402A (en) * 1989-07-21 1991-09-01 Thomson Brandt Gmbh FOOT FOR AN OPTICAL ELEMENT
US5386107A (en) * 1991-12-23 1995-01-31 Symbol Technologies, Inc. Scanning arrangement and method in which the focus is varied in operative correlation with the scanning angle
EP1739469A1 (en) * 2005-06-29 2007-01-03 A-Optronics Technology Inc. Electromagnetically actuated adjusting apparatus for lens
KR100684037B1 (en) 2004-09-03 2007-02-16 주식회사 파워로직스 Lens Actuator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103929A2 (en) * 1982-09-16 1984-03-28 Philips Patentverwaltung GmbH Optical unit for guidance and alignment of a radiator beam
TR24402A (en) * 1989-07-21 1991-09-01 Thomson Brandt Gmbh FOOT FOR AN OPTICAL ELEMENT
US5210649A (en) * 1989-07-21 1993-05-11 Deutsche Thomson-Brandt Gmbh Mount for an optical element
US5386107A (en) * 1991-12-23 1995-01-31 Symbol Technologies, Inc. Scanning arrangement and method in which the focus is varied in operative correlation with the scanning angle
KR100684037B1 (en) 2004-09-03 2007-02-16 주식회사 파워로직스 Lens Actuator
EP1739469A1 (en) * 2005-06-29 2007-01-03 A-Optronics Technology Inc. Electromagnetically actuated adjusting apparatus for lens

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