JPS6464136A - Lens focusing actuator - Google Patents
Lens focusing actuatorInfo
- Publication number
- JPS6464136A JPS6464136A JP22260287A JP22260287A JPS6464136A JP S6464136 A JPS6464136 A JP S6464136A JP 22260287 A JP22260287 A JP 22260287A JP 22260287 A JP22260287 A JP 22260287A JP S6464136 A JPS6464136 A JP S6464136A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- coupled
- permanent magnet
- movable part
- auxiliary magnetic
- 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
Abstract
PURPOSE:To eliminate the need of a power supply to a movable part, to easily enhance the accuracy of the mechanism, and to speed up an optical memory, by using an Nd-Fe-B series rare earth permanent magnet for the movable part of a lens focusing actuator, and constituting all the movable parts of ring-shaped components. CONSTITUTION:To a lens holder 102 to which an objective lens 101 of an optical head is coupled, an auxiliary magnetic pole 103 is coupled, and auxiliary magnetic poles 103, 104 to which a coupled permanent magnet 105 are supported by a plastic sleeve 106. At the outside of this sleeve 106, coils 107, 108 are arranged, and a magnetic circuit is constituted of a yoke 109. This permanent magnet 105 is a magnet of Nd-Fe-B series compound rare earth, and the auxiliary magnetic poles 103, 104 consist of a magnetic pole brought to a green compact by mixing Fe powder, Co powder and Mn powder. Also, all movable parts of a lens focusing actuator are constituted of ring-shaped components, a current in the reverse direction is allowed to flow to the coils 107, 108, it is contrived to make the movable part light in weight, and the high speed responsiveness of the actuator is improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22260287A JPS6464136A (en) | 1987-09-04 | 1987-09-04 | Lens focusing actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22260287A JPS6464136A (en) | 1987-09-04 | 1987-09-04 | Lens focusing actuator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6464136A true JPS6464136A (en) | 1989-03-10 |
Family
ID=16785038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22260287A Pending JPS6464136A (en) | 1987-09-04 | 1987-09-04 | Lens focusing actuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6464136A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999054872A1 (en) * | 1998-04-17 | 1999-10-28 | Koninklijke Philips Electronics N.V. | Optical scanning device comprising a lens system with a compact actuator |
-
1987
- 1987-09-04 JP JP22260287A patent/JPS6464136A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999054872A1 (en) * | 1998-04-17 | 1999-10-28 | Koninklijke Philips Electronics N.V. | Optical scanning device comprising a lens system with a compact actuator |
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