CN2530327Y

CN2530327Y - Magnetic movable positioner

Info

Publication number: CN2530327Y
Application number: CN 01208991
Authority: CN
Inventors: 张起豪
Original assignee: Discovision Associates
Current assignee: Discovision Associates
Priority date: 2001-04-12
Filing date: 2001-04-12
Publication date: 2003-01-08
Anticipated expiration: 2011-04-12

Abstract

The utility model relates to a magnetic movable positioner used on the drive, which comprises a first section for producing a magnetic loop, and a second part provided with a pair of cross loops for producing magnetic force and interacting with the magnetic force produced by the first part. The utility model uses multi loops to form a pair of cross loops structure and forms a special component with the yoke iron having special shape, thereby producing magnetic force with better sensitivity of the basal line to improve the positioning effect of the drive device, synchronously benefiting for the manufacturing and assembling production of the product.

Description

But magnetic dynamic positioning system

Technical field

But the utility model relates to a kind of magnetic dynamic positioning system that is used on the driver.

Background technology

In science and technology growing today, various data storage medium is widely used, and most data storage medium all need by a driver finish data storage, work such as read.On magnetic storage,, all has the driver of a magnetic read/write head as floppy disk, hard disk drive; On optical disc drive, as various CD, VCD, DVD etc., also all need the driver of optical read head, and such as erasable storage devices such as MO, MD, also each needs the read/write head driver of various different types, just can finish its work.And this quasi-driver most important work no more than with read head or read/write head, fast and accurately is placed on the working point, so the usefulness of its location and degree of accuracy seem very important.

But the dynamic positioning system on the existing driver adopts the characteristic of magnetic to realize the location more.With the Liar driver that is applied on the optical read head is example, and its structure can be with reference to the existing technology implementation example one to four of figure 1, Fig. 2, Fig. 3 and Fig. 4.If classify, can be divided into two classes haply according to the movable part V structure that comprises Liar O.L.:

A) coil movable type (Moving Coils):

As Fig. 1, Fig. 2 and shown in Figure 3, have focusing coil F1 on the movable part V, and with vertical path circle T1, T2, T3 and the T4 of following.

B) magnet movable type (Moving Magnets):

As shown in Figure 4, have permanent magnet M1, M2 on the movable part.

Its operation principles is identical haply, all be to utilize permanent magnet M1, M2 and fixedly yoke Y1, Y2, Y3 produce a fixed magnetic field, as electric current by focusing coil F1, F2 or when following path circle T1, T2, T3, T4, can be because the induction of electromagnetism, produce different variable magnetic field in addition, and cause the relative displacement between described coil and the permanent magnet; As long as can control the electric current of the described coil of flowing through, just can cause the relative displacement of different-effect.Above-mentioned two classes, difference promptly are to fix certain partly, make another relative object that partly moves different.

And above-mentioned two classes also respectively have shortcoming.Aspect the locating device of coil movable type, among the embodiment of Fig. 1 and Fig. 2, the magnetic force that both produced all lacks linear characteristic, so that all be difficult to realize accurate control on the location; Among the embodiment of Fig. 3, but must produce the movable part of bearing optical object lens and coiling during fabrication earlier, and movable part is complicated and coiling is difficult for, if coil is wound in advance, stick movable part again, also need many one production processes, therefore also restriction to some extent of the winding mode of coil is difficult for realizing.

Aspect the locating device of magnet moving type, then be that permanent magnet is placed on the movable part; And the weight ratio coil of general magnet is much higher, makes the inborn weight of movable part increase like this, causes sensitivity to reduce, all influences to some extent in speed that moves and accuracy.

The utility model content

But the purpose of this utility model is to provide a kind of magnetic dynamic positioning system that is used on the driver, and it can produce comparatively a linearity and the better magnetic force of sensitivity, and is more convenient for making.

For achieving the above object, but the magnetic dynamic positioning system that is used on the driver of the present utility model, and it comprises: a magnet unit group; One first yoke group, the relative position of it and described magnet unit group is fixed; One second yoke group, it has an end and is connected with the described first yoke group, and the relativeness between corresponding described magnet unit group, the described first yoke group and the second yoke group and produce a magnetic loop; One first coil groups, it is wound on the described second yoke group; And one second coil groups, it is wound on described first coil groups, and winding direction is vertical with the winding direction of described first coil groups, is used to produce magnetic force and produces the magnetic force interaction with described magnetic loop.

As mentioned above, wherein said magnet unit group is several permanent magnets.

As mentioned above, wherein said first coil groups and described magnetic loop effect produce first displacing force on the first direction; And described second coil groups and described magnetic loop effect produce second displacing force on the second direction; And wherein said first direction is vertical with described second direction.

As mentioned above, wherein said driver is the read/write head of optical pickup device.

As mentioned above, described driver comprises a movable part, and described movable part is connected with described first and second coil groups, and has a Liar on the described movable part.

As mentioned above, wherein said first coil groups is several focusing coils, and described second coil groups is followed the path circle for several.

As mentioned above, wherein said first coil groups is a focusing coil, and described second coil groups is two and follows the path circle, and described two follow the two ends that the path circle is wound in described focusing coil respectively, forms described diesis coil.

But used magnetic dynamic positioning system of the present utility model, can adjust its structure at the different elasticity of demand ground of different occasions; Can improve product quality but used magnetic dynamic positioning system of the present utility model, and reduce production costs.

Fig. 1 is a prior art embodiments one;

Fig. 2 is a prior art embodiments two;

Fig. 3 is a prior art embodiments three;

Fig. 4 is a prior art embodiments four;

Fig. 5 is preferred embodiment one of the present utility model;

Fig. 6 is preferred embodiment two of the present utility model;

Fig. 7 is preferred embodiment three of the present utility model;

Fig. 8 is preferred embodiment four of the present utility model;

Fig. 9 is preferred embodiment five of the present utility model.

But the utility model is a kind of magnetic dynamic positioning system that is used on the drive unit.It is to utilize the formed paired-line cross coil structures of several coils, forms a particular combinations with the yoke of special shape, producing the preferable magnetic force of linear characteristic, improving the sensitivity of device, and makes product be easier to make.

Duplicating of operation principles of the present utility model and aforesaid prior art, its structure please refer to preferred embodiment of the present utility model shown in Figure 5.It is to follow path circle T1, T2 by two to be wound on the focusing coil F1, form a pair of cruciform coil, and also comprised a fixing yoke Y2 in the middle of the described diesis shape coil, and described fixedly yoke Y2 be be positioned at the coil outside another fixedly yoke Y1 be connected, the magnetic line of force can be in circulation inside each other.By the magnetic loop that permanent magnet M1 and yoke produce, follow the path circle and can produce magnetic force along X-direction, focusing coil can produce the magnetic force of Z-direction, with mobile movable part.

Under this structure, the magnetic force that is produced can be to being positioned with preferable control than the linear characteristic that has more of Fig. 1, prior art shown in Figure 2.Owing to relatively simple for structure, coil can be wound remaining yoke of recombinant respectively simultaneously, ease of assembly, the utility model also are easier to make and assembling than the existing technology of Fig. 3; Compared with prior art and since settle on the movable part be coil but not magnet, so movable part is in light weight, sensitivity is also preferable.

Figure 6 shows that preferred embodiment two of the present utility model, it cuts half with the fixedly yoke Y2 in the preferred embodiment one of the present utility model, and its usefulness is constant, can reduce material usage and volume simultaneously.Shown in Figure 7 is preferred embodiment three of the present utility model, and it is a structure shown in Figure 6, adds the situation of movable part.

Shown in Figure 8 is preferred embodiment four of the present utility model, and it adopts two group permanent-magnets and yoke combination; Fig. 9 is preferred embodiment five of the present utility model, and it is the situation that Fig. 8 structure adds movable part, and its principle of work all as hereinbefore.

In sum, we can draw following 3 conclusions: but one, used magnetic dynamic positioning system of the present utility model, can flexibly adjust its structure at the different demands of different occasions.But two, used magnetic dynamic positioning system of the present utility model, can improve product quality, and reduce production costs.Therefore, the utility model is to have the original idea of progressive for one.

Claims

But 1. magnetic dynamic positioning system that is used on the driver, it comprises:

One magnet unit group;

One first yoke group, the relative position of it and described magnet unit group is fixed;

One second yoke group, it has an end and is connected with the described first yoke group, and the relativeness between corresponding described magnet unit group, the described first yoke group and the second yoke group and produce a magnetic loop;

One first coil groups, it is wound on the described second yoke group; And

One second coil groups, it is wound on described first coil groups, and winding direction is vertical with the winding direction of described first coil groups, is used to produce magnetic force and produces the magnetic force interaction with described magnetic loop.
2. but magnetic dynamic positioning system as claimed in claim 1 is characterized in that, described magnet unit group is several permanent magnets.
3. but magnetic dynamic positioning system as claimed in claim 1 is characterized in that, described first coil groups and described magnetic loop effect are to produce first displacing force on the first direction.
4. but magnetic dynamic positioning system as claimed in claim 3 is characterized in that, described second coil groups and described magnetic loop effect are to produce second displacing force on the second direction.
5. but magnetic dynamic positioning system as claimed in claim 4 is characterized in that described first direction and second direction are perpendicular.
6. but magnetic dynamic positioning system as claimed in claim 1 is characterized in that, described driver is the read/write head of optical pickup device.
7. but magnetic dynamic positioning system as claimed in claim 6 is characterized in that described driver comprises a movable part.
8. but magnetic dynamic positioning system as claimed in claim 7 is characterized in that, described movable part is to be connected with described first and second coil groups.
9. but magnetic dynamic positioning system as claimed in claim 7 is characterized in that, has a Liar on the described movable part.
10. but magnetic dynamic positioning system as claimed in claim 6 is characterized in that, described first coil groups is several focusing coils.
11. but magnetic dynamic positioning system as claimed in claim 9 is characterized in that described second coil groups is followed the path circle for several.
12. but magnetic dynamic positioning system as claimed in claim 8 is characterized in that described first coil groups is a focusing coil.
13. but magnetic dynamic positioning system as claimed in claim 12 is characterized in that described second coil groups is two and follows the path circle.
14. but magnetic dynamic positioning system as claimed in claim 13 is characterized in that described two to follow the path circle be the two ends that are wound in described focusing coil respectively, to form a paired-line cross circle.