JPS5771529A - Movable lens for controlling focus - Google Patents
Movable lens for controlling focusInfo
- 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
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.
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 (3)
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 |
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 |
-
1980
- 1980-10-22 JP JP14681780A patent/JPS5771529A/en active Pending
Cited By (4)
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 |
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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