CN2447988Y - Electromagnetic actuator with magnetic floating device - Google Patents
Electromagnetic actuator with magnetic floating device Download PDFInfo
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- CN2447988Y CN2447988Y CN 00255305 CN00255305U CN2447988Y CN 2447988 Y CN2447988 Y CN 2447988Y CN 00255305 CN00255305 CN 00255305 CN 00255305 U CN00255305 U CN 00255305U CN 2447988 Y CN2447988 Y CN 2447988Y
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- magnetic
- force
- magnetic line
- electromagnetic actuators
- drive coil
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Abstract
The utility model relates to an electromagnetic actuator, which enables an object to respectively carry out micro-movement and micro-rotation along with a shaft. The utility model comprises a magnetic line of force generating device which comprises a first magnetic pole and a second magnetic pole, wherein, the same poles of the two magnetic poles face each other with interval space; due to the mutual exclusion of magnetic performance, a first magnetic line of force and a second magnetic line of force with gentle curvature are generated in a peripheral annular region positioned at the exterior of the interval space; a first drive coil is connected with the object and arranged in the peripheral annular region, which generates an induction force to drive the object to carry out the micro-movement along the shaft according to the size and the direction of electric current; a second drive coil is connected with the object and arranged on the outer side of the peripheral annular region, which generates an induction force to drive the object to carry out the micro-rotation along the shaft according to the size and the direction of the electric current; a magnetic suspension sheet is connected with the object and arranged at the adjacent position of the first magnetic line of force and the second magnetic line of force.
Description
The utility model relates to a kind of electromagnetic actuators, particularly relates to a kind of object and carries out the electromagnetic actuators that trace moved and rotated and had the floating device of magnetic along one, and this object specifically is meant the objective lens for optical pickup load bearing seat.
In general, card read/write apparatus is that utilization is carried out read-write motion as intensive dish, MO disc-shaped recording mediums such as (magneto optical disks).
And optical head is an important spare part in the card read/write apparatus, and optical head will guide to light-sensitive device so that read by the intensive light that disk reflected by object lens wherein.Yet, because disk itself has the rate of curving and the eccentricity of some degree inevitably, therefore because focusing deviation and tracing deviation that the rate of curving and eccentricity caused, card read/write apparatus must make object lens wherein carry out some micro-moving along pairwise orthogonal direction (being respectively focus direction F and the tracking direction T that is parallel to magnetic disk surface perpendicular to magnetic disk surface) respectively, and then proofreaies and correct above-mentioned deviation.
Move in order to make object lens carry out trace along focus direction and tracking direction respectively, just need objective drive unit, upward view shown in Figure 1A, 1B and profile are the expression U.S. objective drive units that No. 5659525 patent disclosed, wherein object lens load bearing seat 1 moving up and down in fixed axis 7 enterprising line trace directions rotations and focus direction.Object lens 2 are placed on the object lens load bearing seat 1, and balancer 8 is arranged on the another side of object lens 2 and object lens load bearing seat 1 with respect to fixed axis 7, in order to reach the balance of mass motion.Paired focusing coil 4 and tracking coil 3 then are connected to respectively on object lens load bearing seat 1 and the balancer 8, the magnetic line of force that is provided according to permanent magnet 6 and the electromagnetic induction power of focusing coil 4 and 3 generations of tracking coil can drive object lens load bearing seat 1 in the rotation of fixed axis 7 enterprising line trace directions and moving up and down of focus direction.Permanent magnet 6 is fixed on the outer yoke 9,5 slewing areas in order to restriction object lens load bearing seat 1 of interior yoke.Magnetic piece 10 (magnetic piece) acts on permanent magnet 6, the restoring force of 1 one two-dimensional directionals of object lens load bearing seat is provided, and then does not do the time spent at focusing coil 4 and tracking coil 3, makes object lens load bearing seat 1 quick recoverable to static middle position.
Fig. 1 C, 1D represent the detailed construction schematic diagram of magnetic piece 10 and permanent magnet 6 respectively.Can know by figure and to find out that the employed magnetic piece 10 of above-mentioned patent must be made into I-shaped, and permanent magnet 6 also need be made into curved surface, and be the single face bipolarity.Therefore, difficulty and time-consuming in manufacture process, and the magnetic circuit utilization ratio of focusing coil 4 and tracking coil 3 is not good, how to develop one and make simple and easy and have the objective drive unit structure of high magnetic circuit service efficiency, be main purpose of the present utility model.
This is novel to relate to a kind of electromagnetic actuators, it makes an object carry out trace along one respectively and moves and carry out the trace rotation along this axle, this electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, relative between this first magnetic pole and this second magnetic pole with a clearance space same sex, and then because of producing mild first magnetic line of force, second magnetic line of force of curvature in the peripheral annular section of magnetic mutual exclusion outside clearance space; One first drive coil is connected to object and is arranged in the peripheral annular section, produces according to the size and Orientation of electric current wherein to drive object and carry out the induction force that trace moves along axle; One second drive coil is connected to object and is arranged on the outside of peripheral annular section, produces according to the size of electric current wherein and direction to drive object and carry out the induction force that trace rotates along axle; And the floating sheet of a magnetic, be connected to object and be arranged on first magnetic line of force and the adjacent of second magnetic line of force, the size by the clearance space of controlling magnetic pole makes the intensity of the magnetic line of force be enough to provide restoring force, and then do not do the time spent at drive coil, make object remain on a static middle position.
According to above-mentioned, object is in order to carry the object lens load bearing seat of object lens in the card read/write apparatus optical head in the electromagnetic actuators, and first drive coil is a focusing coil, second drive coil is a tracking coil, and the normal vector on plane that this tracking coil constitutes can be parallel with the tangent line of circle that with this is the center of circle.
According to above-mentioned, magnetic line of force generation device can constitute with the clearance space next-door neighbour with the like pole of two permanent magnets in the electromagnetic actuators.
According to above-mentioned, also can be provided with the floating sheet of another magnetic line of force generation device, first drive coil, second drive coil and magnetic in the electromagnetic actuators with axial symmetry.
This is novel to relate to a kind of electromagnetic actuators on the other hand, it makes an object carry out trace along one and moves, this electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, this magnetic pole is relative with a clearance space same sex, and then produces the one first mild magnetic line of force of curvature and one second magnetic line of force respectively because of producing in the peripheral annular section of magnetic mutual exclusion outside this clearance space; One first drive coil is connected to this object and is arranged in the peripheral annular section, produces according to the size of electric current wherein and direction to drive object and carry out the induction force that trace moves along this; One magnetic floats sheet, is connected to object and is arranged on first magnetic line of force and the adjacent of second magnetic line of force, and the size of the clearance space of control magnetic pole makes the intensity of the magnetic line of force be enough to not do the time spent at drive coil, makes object remain on a static middle position.
According to above-mentioned, object is in order to carrying the object lens load bearing seat of object lens in the card read/write apparatus optical head in the electromagnetic actuators, and first drive coil is a focusing coil, and magnetic line of force generation device is that the like pole with two permanent magnets constitutes with the clearance space next-door neighbour.
According to above-mentioned, also can be provided with the floating sheet of another magnetic line of force generation device, first drive coil and magnetic in the electromagnetic actuators with axial symmetry.
This novel another aspect relates to a kind of electromagnetic actuators, it makes an object carry out trace along one and moves, this electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, magnetic pole is relative with a clearance space same sex, and then produces the one first mild magnetic line of force of curvature and one second magnetic line of force respectively because of producing in the peripheral annular section of magnetic mutual exclusion outside clearance space; One second drive coil, the outside that it is connected to this object and is arranged on peripheral annular section produces according to the size of electric current wherein and direction and to drive object and carry out the induction force that trace moves along axle; One magnetic floats sheet, and it is connected to object and is arranged on first magnetic line of force and the adjacent of second magnetic line of force, and the clearance space size of control magnetic pole makes the intensity of the magnetic line of force be enough to not do the time spent at drive coil, makes object remain on static middle position.
According to above-mentioned, object is in order to carry an object lens load bearing seat of object lens in the card read/write apparatus optical head in the electromagnetic actuators.
According to above-mentioned, second drive coil is a tracking coil in the electromagnetic actuators, the normal vector on plane that this tracking coil constitutes can be parallel with the tangent line of circle that with this is the center of circle, and magnetic line of force generation device can constitute with this clearance space next-door neighbour with the like pole of two permanent magnets.
According to above-mentioned, also can be provided with the floating sheet of another magnetic line of force generation device, second drive coil and magnetic in the electromagnetic actuators with axial symmetry.
A kind of magnetic that relates in one aspect to again that this is novel floats device, it offers object one restoring force, make this object be in static middle position, this device comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, magnetic pole is relative with a clearance space same sex, and produces one first magnetic line of force and one second magnetic line of force respectively; And the floating sheet of a magnetic, it is connected to object and is arranged on first magnetic line of force and the adjacent of second magnetic line of force, and the size of the clearance space of control magnetic pole makes the intensity of the magnetic line of force be enough to provide restoring force, and then makes object keep static middle position when nature.
According to above-mentioned, object is in order to carrying an object lens load bearing seat of object lens in the card read/write apparatus optical head in the floating device of magnetic, and the object lens load bearing seat can carry out trace along one and move and rotation.
According to above-mentioned, also can be provided with another magnetic line of force generation device and the floating sheet of magnetic in the floating device of magnetic with axial symmetry.
Contrast following accompanying drawing and detailed description, can understand the utility model more in depth:
Figure 1A, 1B are the upward view and the profiles of the objective drive unit that disclosed in No. 5659525 patent of the U.S. in the prior art;
Fig. 1 C, 1D are the magnetic piece that disclosed in No. 5659525 patent of the U.S. in the prior art and the detailed construction schematic diagram of permanent magnet;
Fig. 2 A, 2B, 2C, 2D are preferred embodiments of the electromagnetic actuators of the floating device of magnetic of the present utility model, represent that it is looked up, section and D structure schematic diagram.
Referring to Fig. 2 A, 2B, 2C, 2D, a preferred embodiment of the electromagnetic actuators of the floating device of this novel magnetic of its expression, the objective drive unit in the optical head of the especially suitable card read/write apparatus that requirement improves day by day as read or write speed.
Fig. 2 A represents the upward view of objective drive unit, wherein object lens load bearing seat 21 is carrying object lens 20, object lens load bearing seat 21 movable sets are on one 22, this axle is fixedly installed on the yoke 23, magnetic line of force generation device 241,242 is made of the permanent magnet relative with axle 22 symmetrically arranged two groups of same sexes, and be fixed on first drive coil 251,252 on the object lens load bearing seat 21 as focusing coil, be fixed on second drive coil 261,262,263,264 on the object lens load bearing seat 21 in order to finish tracking coil.
Fig. 2 B represents the profile of objective drive unit along A-A ', wherein clear first magnetic pole 2411, second magnetic pole 2412, the 3rd magnetic pole 2421 and the 4th magnetic pole 2422 that constitutes this magnetic line of force generation device 211,242 of expressing, with first magnetic pole 2411 and second magnetic pole 2412 is example, it is relative with a clearance space same sex, because of producing mild first magnetic line of force 281 and second magnetic line of force 282 (seeing shown in the arrow among the figure) of curvature in the peripheral annular section of magnetic mutual exclusion outside clearance space, the 3rd magnetic pole 2421 is identical with the situation of the 4th magnetic pole 2422, repeats no more.(first drive coil is arranged on peripheral annular section after carrying out as shown in the figure spatial configuration by above-mentioned magnetic pole and drive coil, second drive coil is arranged on the outside of peripheral annular section, the normal vector on second plane that drive coil constitutes is parallel with the tangent line of circle that with this is the center of circle), the magnetic circuit utilization ratio of first drive coil 251,252 almost can reach 100%, and the magnetic circuit utilization ratio of second drive coil 261,262,263,264 is also up to 70% to 80%.First drive coil 251,252 produces according to the size of electric current wherein and direction and drives object lens load bearing seat 21 and 22 carry out the induction force (as focusing coil) that trace moves along this, and second drive coil produces according to the size of electric current wherein and direction and drives this object and carry out the induction force (tracking coil) of micro-rotation along this.
Be connected to the floating sheet 271,272 of magnetic (being the very easy coin round iron plate of a making shown in the figure) of object lens load bearing seat 21, it is symmetrical in this axle 22 and is provided with, and it is arranged in the adjacent of first magnetic line of force 281 and second magnetic line of force 282 (seeing shown in the arrow among the figure), clearance space size by the control magnetic pole, make the intensity of the magnetic line of force be enough to provide restoring force, and then do not do the time spent at drive coil, and make object remain on static middle position, reach the floating requirement of its magnetic.
Referring to Fig. 2 D, it represents the D structure schematic diagram of preferred embodiment of the present utility model, the wherein clear situation of object lens load bearing seat 21 movable sets on axle 22 of expressing carrying object lens 20, axle 22 all is fixedly installed on the yoke 23 with magnetic line of force generation device 241,242, and be fixedly installed on first drive coil 251,252 on the object lens load bearing seat 21 as focusing coil, be fixedly installed on 261,262,263,264 of second drive coils on the object lens load bearing seat 21 with radial arrangement to constitute tracking coil.
In sum, the magnetic piece that preferred embodiment of the present utility model provides and the making of permanent magnet are comparatively simple and easy, and effectively improve the objective drive unit structure of the magnetic circuit service efficiency of drive coil, the preferable solution that meets optical head future development demand can effectively reach main purpose of the present utility model.
Claims (20)
1. electromagnetic actuators, it makes an object carry out trace along one respectively and moves and carry out trace rotation along described axle, it is characterized in that, described electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, relative between described first magnetic pole and described second magnetic pole with a clearance space same sex, and then because of producing mild first magnetic line of force, second magnetic line of force of curvature in the peripheral annular section of magnetic mutual exclusion outside clearance space; One first drive coil, it is connected to object and is arranged in the peripheral annular section, produces according to the size and Orientation of electric current wherein to drive object and carry out the induction force that trace moves along axle; One second drive coil is connected to object and is arranged on the outside of peripheral annular section, produces according to the size of electric current wherein and direction to drive object and carry out the induction force that trace rotates along axle; And the floating sheet of a magnetic, be connected to object and be arranged on first magnetic line of force and the adjacent of second magnetic line of force, the size by the clearance space of controlling magnetic pole makes the intensity of the magnetic line of force be enough to provide restoring force, and then do not do the time spent at drive coil, make object remain on a static middle position.
2. electromagnetic actuators according to claim 1 is characterized in that described object is the object lens load bearing seat of object lens in the carrying one card read/write apparatus optical head.
3. electromagnetic actuators according to claim 2 it is characterized in that first drive coil is a focusing coil, and second drive coil is a tracking coil.
4. electromagnetic actuators according to claim 3 is characterized in that the normal vector on plane that tracking coil constitutes is parallel with the tangent line of circle that with the axle is the center of circle.
5. electromagnetic actuators according to claim 2 is characterized in that magnetic line of force generation device is to constitute with the clearance space next-door neighbour with the like pole of two permanent magnets.
6. electromagnetic actuators according to claim 1 is characterized in that being provided with the floating sheet of another magnetic line of force generation device, first drive coil, second drive coil and magnetic with axial symmetry.
7. electromagnetic actuators, it makes an object carry out trace along one and moves, it is characterized in that described electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, magnetic pole is relative with a clearance space same sex, and then produces the first mild magnetic line of force of curvature and second magnetic line of force respectively because of producing in the peripheral annular section of magnetic mutual exclusion outside clearance space; One first drive coil is connected to object and is arranged in the peripheral annular section, produces according to the size and Orientation of electric current wherein to drive object and carry out the induction force that trace moves along axle; One magnetic floats sheet, is connected to object and is arranged on first magnetic line of force and the adjacent of second magnetic line of force, and the size by the clearance space of controlling magnetic pole makes the intensity of the magnetic line of force be enough to not do the time spent at drive coil, makes object remain on a static middle position.
8. electromagnetic actuators according to claim 7 is characterized in that object is the object lens load bearing seat of object lens in the carrying one card read/write apparatus optical head.
9. electromagnetic actuators according to claim 8 is characterized in that first drive coil is a focusing coil.
10. electromagnetic actuators according to claim 8 is characterized in that magnetic line of force generation device is to constitute with the clearance space next-door neighbour with the like pole of two permanent magnets.
11. electromagnetic actuators according to claim 7 is characterized in that being provided with the floating sheet of another magnetic line of force generation device, first drive coil and magnetic with axial symmetry.
12. electromagnetic actuators, it makes an object carry out trace along one and moves, it is characterized in that described electromagnetic actuators comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, described magnetic pole is relative with a clearance space same sex, and then because of producing the one first mild magnetic line of force of curvature and one second magnetic line of force in the peripheral annular section of magnetic mutual exclusion outside clearance space respectively; One second drive coil is connected to described object and is arranged on the outside of peripheral annular section, produces according to the size of electric current wherein and direction to drive object and carry out the induction force that trace moves along described axle; One magnetic floats sheet, is connected to object and is arranged on first magnetic line of force and the adjacent of second magnetic line of force, and the size by the described clearance space of controlling magnetic pole makes the intensity of the magnetic line of force be enough to not do the time spent at drive coil, makes object remain on a static middle position.
13. electromagnetic actuators according to claim 12 is characterized in that object is the object lens load bearing seat of object lens in the carrying one card read/write apparatus optical head.
14. electromagnetic actuators according to claim 13 is characterized in that second drive coil is a tracking coil.
15. electromagnetic actuators according to claim 14 is characterized in that the normal vector on plane that tracking coil constitutes is parallel with the tangent line of circle that with the axle is the center of circle.
16. electromagnetic actuators according to claim 13 is characterized in that magnetic line of force generation device is to constitute with the clearance space next-door neighbour with the like pole of two permanent magnets.
17. electromagnetic actuators according to claim 12 is characterized in that being provided with the floating sheet of another magnetic line of force generation device, second drive coil and magnetic with axial symmetry.
18. floating device of magnetic, it provides restoring force for an object, make described object be in static middle position, it is characterized in that described device comprises: a magnetic line of force generation device, it comprises one first magnetic pole and one second magnetic pole, magnetic pole is relative with a clearance space same sex, and produces one first magnetic line of force and one second magnetic line of force respectively; And the floating sheet of a magnetic, be connected to object and be arranged on first magnetic line of force and the adjacent of second magnetic line of force, size by the clearance space of controlling magnetic pole makes the intensity of the magnetic line of force be enough to provide restoring force, and then makes object remain on a static middle position when nature.
19. magnetic according to claim 18 floats device, it is characterized in that object is the object lens load bearing seat of object lens in the carrying one card read/write apparatus optical head, described object lens load bearing seat can carry out trace along one and move and rotate.
20. magnetic according to claim 19 floats device, it is characterized in that being provided with another magnetic line of force generation device and the floating sheet of magnetic with axial symmetry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00255305 CN2447988Y (en) | 2000-10-23 | 2000-10-23 | Electromagnetic actuator with magnetic floating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00255305 CN2447988Y (en) | 2000-10-23 | 2000-10-23 | Electromagnetic actuator with magnetic floating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2447988Y true CN2447988Y (en) | 2001-09-12 |
Family
ID=33612326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00255305 Expired - Lifetime CN2447988Y (en) | 2000-10-23 | 2000-10-23 | Electromagnetic actuator with magnetic floating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2447988Y (en) |
-
2000
- 2000-10-23 CN CN 00255305 patent/CN2447988Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: YUTIAN STOCK CO., LTD. Free format text: FORMER OWNER: HONGJING SCIENCE + TECH. CO., LTD. Effective date: 20071221 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20071221 Address after: Delaware, zip code: 000000 Patentee after: VIA Tech Inc. Address before: Postcode of Taiwan, Hsinchu: Patentee before: Hongjing Science-Technology Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20101023 Granted publication date: 20010912 |