CN103312232B - Magnetic suspension motor - Google Patents

Abstract

A magnetic levitation motor used to drive a lens module, the magnetic levitation motor includes a fixed unit and a movable unit, the movable unit is movably arranged in the fixed unit, the fixed unit includes a fixed frame and a first magnetic field generating assembly, the first magnetic field The generating assembly is fixed on the fixed frame, the fixed frame has a guide post, the movable unit includes a movable frame and a second magnetic field generating assembly, the second magnetic field generating assembly is fixed on the movable frame, the movable frame is used to accommodate the lens module, and the movable frame has Corresponding to the gap of the guide post, at least one of the first magnetic field generating component and the second magnetic field generating component is an electromagnet comprising a coil and an iron core, and the movable unit generates Under the action of the magnetic field, the guide pillar moves along the optical axis in the fixed unit.

Description

Maglev motor

technical field

The invention relates to a magnetic levitation motor.

Background technique

The main principle of the voice coil motor (VCM) is to control the stretching position of the shrapnel by changing the current of the inner coil of the voice coil motor in the permanent magnetic field, so that the coil receives different magnetic force, so as to control the stretching position of the shrapnel, thereby driving the lens Move up and down to achieve the movement function of the lens.

Since the coil moves up and down with the lens, the coil is sometimes damaged, causing distortion during focusing or zooming, resulting in low reliability of the voice coil motor; in addition, the elastic fatigue of the shrapnel will permanently cause distortion.

Contents of the invention

In view of this, it is necessary to provide a magnetic levitation motor with high reliability.

A magnetic levitation motor used to drive a lens module, the magnetic levitation motor includes a fixed unit and a movable unit, the movable unit is movably arranged in the fixed unit, the fixed unit includes a fixed frame and a first magnetic field generating assembly, the The first magnetic field generating assembly is fixed on the fixed frame, and the fixed frame has guide posts, and the movable unit includes a movable frame and a second magnetic field generating assembly, and the second magnetic field generating assembly is fixed on the movable frame Above, the movable frame is used to accommodate the lens module, the movable frame has a notch corresponding to the guide post, and the guide post is engaged in the notch, the first magnetic field generating assembly and the second magnetic field At least one of the generating components is an electromagnet including a coil and an iron core, and the movable unit moves along the guide post under the action of the magnetic field generated by the first magnetic field generating component and the second magnetic field generating component. Move along the direction of the optical axis in the fixed unit.

Compared with the prior art, the magnetic levitation motor of the embodiment of the present invention uses magnetic field force to drive the movable unit to move, and because the shrapnel is omitted, no elastic fatigue occurs, so that the reliability of the maglev motor is higher.

Description of drawings

Fig. 1 is a schematic diagram of a magnetic levitation motor according to an embodiment of the present invention.

FIG. 2 is an exploded schematic diagram of FIG. 1 .

FIG. 3 is an exploded schematic view from another angle of FIG. 2 .

Description of main component symbols

Maglev motor 100 case 10 fixed unit 20 Fixture twenty one The first magnetic field generating component twenty two first storage space 200 Bottom plate 210 Guide post 211 Blind hole 212 activity unit 30 Activity rack 31 Second magnetic field generating component 32 Second storage space 300 groove 310 gap 311 raised 312 shrapnel 40 Clear hole 400 first via 41 Second via 42 elastic part 43 Carrier 50 Boss 51

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the magnetic levitation motor 100 provided by the embodiment of the present invention is used to drive a lens module (not shown in the figure) to realize focusing or zooming functions, and the lens module has an optical axis.

The magnetic levitation motor 100 includes a housing 10 , a fixed unit 20 , a movable unit 30 , a shrapnel 40 and a carrier 50 .

The casing 10 is used to accommodate the fixed unit 20 , the movable unit 30 , the elastic piece 40 and the carrier 50 to prevent external interference to the above components and to have the function of preventing electromagnetic interference.

The fixing unit 20 includes a fixing frame 21 and four first magnetic field generating components 22 . The fixing frame 21 includes a hollow square bottom plate 210 , four corners of the bottom plate 210 are respectively provided with guide posts 211 of the same height in the same direction, and the extension directions of the guide posts 211 are parallel to the optical axis. Four blind holes 212 are formed on a side of the bottom plate 210 away from the guide post 211 . The guide post 211 and the bottom plate 210 define a first receiving space 200 for receiving the movable unit 30 . The first magnetic field generating component 22 is fixed on the bottom plate 210 between adjacent guide posts 211 and has a certain gap with the guide posts 211 . The first magnetic field generating component 22 can be a permanent magnet or an electromagnet (generally including a coil and an iron core and the coil is wound on the iron core). If it is a permanent magnet, the first magnetic field generating component 22 generates a constant magnetic field (ie, a permanent magnetic field ), if it is an electromagnet, it can produce a variable magnetic field.

The movable unit 30 includes a movable frame 31 and four second magnetic field generating components 32 . The movable frame 31 has a second accommodating space 300 for accommodating the lens module. The movable frame 31 has four grooves 310. The second magnetic field generating assemblies 32 are respectively fixed in the grooves 310, and one second magnetic field generating assembly 32 corresponds to one The first magnetic field generating component 22 . The movable frame 31 has a notch 311 corresponding to the guide post 211 , and the guide post 211 is engaged in the notch 311 . The movable frame 31 has four protrusions 312 on the side away from the notch 311 . The second magnetic field generating component 32 can be a permanent magnet or an electromagnet. If it is a permanent magnet, the second magnetic field generating component 32 can generate a constant magnetic field. If it is an electromagnet, it can generate a variable magnetic field.

One of the first magnetic field generating component 22 and the second magnetic field generating component 32 needs to be an electromagnet, that is, when the first magnetic field generating component 22 is a permanent magnet, the second magnetic field generating component 32 needs to be an electromagnet, and vice versa.

The shape of the elastic sheet 40 is the same as that of the fixed frame 21 and the movable frame 31. The elastic sheet 40 has a light through hole 400, and the light through hole 400 has a first through hole 41 and a second through hole 42, and the first through hole 41 and the second through hole 400. Between the through holes 42 is an elastic portion 43 and the first through hole 41 is away from the light through hole 400 . The elastic piece 40 is fixed on the movable frame 31 through the second through hole 42 and the protrusion 312 on the movable frame 31 by dispensing process.

The shape of the carrier body 50 is the same as that of the fixed frame 21 and the movable frame 31. The four corners of the carrier body 50 have a protruding post 51 respectively. hole 212 , and fix the fixed frame 21 and the elastic piece 40 on the carrier 50 by dispensing process, so that the movable frame 31 is suspended in the first accommodation space 200 of the fixed frame 21 by the action of the elastic part 43 .

Of course, the shrapnel 40 can be omitted. When the elastic piece 40 is omitted, the boss 51 of the carrier 50 is directly fixed in the blind hole 212 of the fixed frame 21, and the movable frame 31 is suspended in the first accommodation space 200 by the friction force between the guide post 211 and the notch 311. middle. In addition, the structure corresponding to the elastic piece 40 on the movable frame 31 can also be omitted.

When the first magnetic field generating assembly 22 is a permanent magnet and the second magnetic field generating assembly 32 is an electromagnet, if there is no current in the second magnetic field generating assembly 32, then the second magnetic field generating assembly 32 will not generate a magnetic field. There is only the permanent magnetic field generated by the first magnetic field generating assembly 22 in the motor 100, and there will be no magnetic force between the first magnetic field generating assembly 22 and the second magnetic field generating assembly 32, so the movable unit 30 maintains the initial position; if the second magnetic field generates When there is current flowing in the component 32, the second magnetic field generating component 32 will generate a magnetic field. In the magnetic levitation motor 100, there is not only the permanent magnetic field generated by the first magnetic field generating component 22, but also the variable magnetic field generated by the second magnetic field generating component 32. , according to the different directions of the incoming current, the permanent magnetic field and the variable magnetic field have mutual attraction and repulsion. Since the fixed unit 20 is fixed on the carrier 50 and cannot move, the movable unit 30 is movable. Therefore, the movable unit 30 The movement of the movable unit 30 drives the lens module to move along the guide post 211 under the action of the magnetic field force, thereby realizing the focusing or zooming function.

After focusing or zooming is completed, the current input to the second magnetic field generating assembly 32 can be stopped, and the movable unit 30 can return to the initial position under the action of the elastic part 43, or input reverse current to the second magnetic field generating assembly 32 to make it Magnetic fields in opposite directions are generated to return the movable unit 30 to the original position.

When the first magnetic field generating component 22 is an electromagnet and the second magnetic field generating component 32 is a permanent magnet, the working principle of the magnetic levitation motor 100 is the same as that described above, so it will not be repeated here.

Because the magnetic levitation motor 100 can omit the shrapnel, there will be no focus or zoom distortion and the cost is low; in addition, because the coil of the electromagnet is wound on the iron core, there is no need for magnetic levitation motor 100 when it is falling. Coil damage problem.

It can be understood that those skilled in the art can also make other changes within the spirit of the present invention to be used in the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (5)

1. a kind of magnetic suspension motor, for driving camera lens module, it is characterised in that the magnetic suspension motor includes fixed cell and activity Unit, the active unit are actively set in the fixed cell, and the fixed cell includes fixed mount and is produced from the first magnetic field Raw component, first field generating component are fixed on the fixed mount, and the fixed mount has guide pillar, the active unit Including adjustable shelf and the second field generating component, second field generating component is fixed on the adjustable shelf, the activity Frame is used for accommodating the camera lens module, and the breach on the adjustable shelf with the corresponding guide pillar, the guide pillar is fastened on described In breach, first field generating component and the second field generating component are magnet, first field generating component and At least one among both second field generating components is the electromagnet for including coil and iron core, and the coil is around being located at the iron core On, the active unit is produced described in the effect lower edge in magnetic field in first field generating component and the second field generating component Guide pillar moves in the fixed cell along optical axis direction, and the magnetic suspension motor does not include shell fragment, and the guide pillar is four, described Fixed mount has a square bottom plate, and the guide pillar is arranged on four corners of the bottom plate, and the magnetic suspension motor is further Including a supporting body, the bottom plate is fixed on the supporting body, has projection on the supporting body, has on the bottom plate Blind hole, the projection are extend into the blind hole.

2. magnetic suspension motor as claimed in claim 1, it is characterised in that first field generating component is electromagnet, described Coil is wrapped on the iron core, and second field generating component is permanent magnet.

3. magnetic suspension motor as claimed in claim 1, it is characterised in that second field generating component is electromagnet, described It is permanent magnet that coil, which is wrapped in first field generating component on the iron core,.

4. magnetic suspension motor as claimed in claim 1, it is characterised in that the breach is four.

5. the magnetic suspension motor as described in claim 1-4 is any, it is characterised in that the magnetic suspension motor includes housing, for holding Receive the fixed cell and active unit.