CN102466845A

CN102466845A - Voice coil motor

Info

Publication number: CN102466845A
Application number: CN2010105479315A
Authority: CN
Inventors: 辜炳翰
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2010-11-17
Filing date: 2010-11-17
Publication date: 2012-05-23

Abstract

The invention discloses a voice coil motor, for driving a lens module, the lens module comprising an optical axis. The voice coil motor comprises a fixing unit, a movable unit, a carrier, a first guide rod and a second guide rod, wherein the fixing unit comprises a fixing bracket and a magnet arranged on the fixing bracket, the fixing bracket comprises a central axis and a accommodating space overlapped with the optical axis, the movable unit is arranged in the accommodating space, the accommodating space comprises a barrel and a coil wound on the barrel, the barrel comprises a first through hole and a second through hole which have central axes in parallel with the optical axis and are symmetrical relative to the optical axis, the barrier is matched with the fixing bracket for accommodating a movable piece, and two ends of each of the first and the second guide rails are respectively fixed on the fixing bracket and the barrier; when current flows through the coil, the barrel moves under the effect of the electromagnetic force of the magnetic and the coil and the guidance of the first and the second guide rods.

Description

Voice coil motor

Technical field

The present invention relates to a kind of voice coil motor simple in structure.

Background technology

Traditional voice coil motor needs to use precompression of shell fragment manufacturing to make when voice coil motor does not apply strength, can get back on the position originally.

But because this precompression can cause voice coil motor in the process that moves, need have more this precompression of strength opposing of a part, cause the power consumption of itself to increase, and make body overheated, can't reach carbon reduction.

In addition, shell fragment is prone to cause assembly error when assembling, cause camera lens module inclination angle excessive, causes image quality bad.

Summary of the invention

In view of this, be necessary to provide a kind of shell fragment, voice coil motor simple in structure of not needing.

A kind of voice coil motor; It is used for driving the motion of camera lens module, and said camera lens module has optical axis, and said voice coil motor comprises: fixed cell; It comprises fixed mount and is arranged on the magnet on the said fixed mount that said fixed mount has the receiving space of central shaft and optical axis coincidence; Mobile unit; It is arranged in the said receiving space and can in said receiving space, moves; Said mobile unit comprises fitted tube and the coil of winding outside said fitted tube, and said fitted tube has first through hole and second through hole and the said relatively symmetrical of said first through hole of the said optical axis of central axes; Supporting body, it matches with said fixed mount and is used to accommodate said movable piece; First guide rod, it is located in said first through hole, and two ends are separately fixed on said fixed mount and the supporting body; And second guide rod; It is located in said second through hole; And two ends are separately fixed on said fixed mount and the supporting body; When in the coil when the electric current, said fitted tube direction at the parallel said optical axis in guiding lower edge of said first guide rod and second guide rod under the electromagnetic force effect of said magnet and coil moves.

Compared to prior art; The voice coil motor of present embodiment omits the elastic piece structure in traditional voice coil motor; Make structure and assembling process comparatively simple; And mat lives the motion that symmetrically arranged first guide rod and second guide rod are guided mobile unit, can avoid fitted tube run-off the straight at the volley, thereby makes the optical axis that the direction of motion of fitted tube can paralleloscope head mould group.

Description of drawings

Fig. 1 is the synoptic diagram of embodiment of the invention voice coil motor.

Fig. 2 is the exploded view of embodiment of the invention voice coil motor.

Fig. 3 is the sectional view along III-III line among Fig. 1.

The main element symbol description

Voice coil motor 100

Fixed cell 10

Fixed mount 11

Magnet 12

First receiving space 110

First containing hole 111

Second containing hole 112

Reference column 113

Mobile unit 20

Fitted tube 21

Coil 22

Second receiving space 210

First through hole 211

Second through hole 212

First guide rod 30

Second guide rod 40

Supporting body 50

Light hole 510

First accepting hole 511

Second accepting hole 512

Pilot hole 513

Housing 60

Embodiment

To combine accompanying drawing that the embodiment of the invention is done further explain below.

See also Fig. 1, Fig. 2 and shown in Figure 3; The voice coil motor 100 that the embodiment of the invention provides is used for driving focusing of camera lens module motion realization or zoom; Voice coil motor 100 comprises fixed cell 10, mobile unit 20, first guide rod 30, second guide rod 40, supporting body 50 and housing 60, and housing 60 is used to accommodate fixed cell 10 and mobile unit 20.

Fixed cell 10 comprises fixed mount 11 and is arranged on the magnet 12 on the fixed mount 11.Fixed mount 11 is for having the square structure of first receiving space 110, and first receiving space 110 is used for accommodating the central shaft of mobile unit 20, the first receiving spaces 110 and the optical axis coincidence of camera lens module.Have first containing hole 111 and second containing hole 112 on the diagonal angle of fixed mount 11, be used for fixing first guide rod 30 and second guide rod 40.Fixed mount 11 has reference column 113 near an end of supporting body 50.

Certainly, first containing hole 111 and second containing hole 112 also can be arranged on relative two limits of fixed mount 11, as long as guarantee the central shaft symmetry of first containing hole 111 and second containing hole, 112 relative first receiving spaces 110.

First containing hole 111 and second containing hole 112 can be through hole or blind hole.

Mobile unit 20 comprises fitted tube 21 and the coil 22 of winding on fitted tube 21; When feeding electric current in the coil 22; Just can produce electromagnetic force between the magnet 12 of fixed cell 10 and the coil 22; The direction of electromagnetic force can sense of current is corresponding to change along with feeding, thereby makes the direction of motion of fitted tube 21 change.

Fitted tube 21 is for having the square structure of second receiving space 210, and second receiving space 210 is used for accommodating the camera lens module, so that the camera lens module is in the drive campaign of fitted tube 21.Having first through hole 211 and second through hole 212 on the diagonal angle of fitted tube 21 is used for making first guide rod 30 and second guide rod 40 to wear.

Supporting body 50 is used for accommodating fixed cell 10 and mobile unit 20 with housing 60; Have light hole 510, first accepting hole 511, second accepting hole 512 and pilot hole 513 on the supporting body 50; Light hole 510 is used for making from the light of camera lens module outgoing and is incident on the image sensor (figure does not show); First accepting hole 511 and second accepting hole 512 are used for fixing first guide rod 30 and second guide rod 40, and pilot hole 513 is used for matching in reference column 113 on the fixed mount 11 and makes fixed mount 11 location and being fixed on the supporting body 50.

First accepting hole 511 and second accepting hole 512 can be through hole or blind hole.When first containing hole 111 and second containing hole 112 were blind hole, first accepting hole 511 and second accepting hole 512 should be through hole; When first containing hole 111 and second containing hole 112 were through hole, first accepting hole 511 and second accepting hole 512 can be through hole or blind hole.

Housing 60 also can be used for eliminating external electromagnetic to the interference of this voice coil motor 100 and prevent the work of its external electronic components of electromagnetic effect of voice coil motor 100.

When assembling voice coil motor 100; Earlier first guide rod 30 and second guide rod 40 are placed first accepting hole 511 and second accepting hole 512; It is fixing with first guide rod 30 and second guide rod 40 that mat is lived gluing process; Make first guide rod 30 and second guide rod 40 pass first through hole 211 and second through hole 212 on the fitted tube 21 then; First containing hole 111 on the fixed mount 11 and second containing hole 112 are located on first guide rod 30 and second guide rod 40, mat is lived gluing process first guide rod 30 and second guide rod 40 is fixed in first containing hole 111 and second containing hole 112 once more again.

Certainly, also has other assemble method, as long as first through hole 211 that is located in fitted tube 21 and the two ends of first guide rod 30 in second through hole 212 and second guide rod 40 are separately fixed on supporting body 50 and the fixed mount 11.

Because fitted tube 21 is located on first guide rod 30 and second guide rod 40; When feeding electric current in the coil 22; Just can produce electromagnetic force between the magnet 12 of fixed cell 10 and the coil 22; Electromagnetic force makes fitted tube 21 under

first guide rod

30 and 40 guidings of second guide rod, move, and can accomplish focusing or zoom operation thereby get the camera lens module; After accomplishing corresponding function, can feed in the other direction electric currents so that mobile unit 20 can be replied initial position to coil 22, certainly, also can mat live the gravity of mobile unit 20 itself and reply initial position.

The elastic piece structure that the voice coil motor 100 of present embodiment omits in traditional voice coil motor; Make structure and assembling process comparatively simple; And mat is lived the motion that symmetrically arranged first guide rod 30 and second guide rod 40 are guided mobile unit 20; Can avoid fitted tube 21 run-off the straight at the volley, thereby make the optical axis of the direction of motion ability paralleloscope head mould group of fitted tube 21.

It is understandable that those skilled in the art also can do other variation etc. and be used for design of the present invention in spirit of the present invention, as long as it does not depart from technique effect of the present invention and all can.These all should be included within the present invention's scope required for protection according to the variation that the present invention's spirit is done.

Claims

1. voice coil motor, it is used for driving the motion of camera lens module, and said camera lens module has optical axis, and said voice coil motor comprises:

Fixed cell, it comprises fixed mount and is arranged on the magnet on the said fixed mount that said fixed mount has the receiving space of central shaft and optical axis coincidence;

Mobile unit; It is arranged in the said receiving space and can in said receiving space, moves; Said mobile unit comprises fitted tube and the coil of winding outside said fitted tube, and said fitted tube has first through hole and second through hole and the said relatively symmetrical of said first through hole of the said optical axis of central axes;

Supporting body, it matches with said fixed mount and is used to accommodate said movable piece;

First guide rod, it is located in said first through hole, and two ends are separately fixed on said fixed mount and the supporting body; And

Second guide rod; It is located in said second through hole; And two ends are separately fixed on said fixed mount and the supporting body; When in the coil when the electric current, said fitted tube direction at the parallel said optical axis in guiding lower edge of said first guide rod and second guide rod under the electromagnetic force effect of said magnet and coil moves.

2. voice coil motor as claimed in claim 1 is characterized in that, has containing hole on the said fixed mount, and an end of said first guide rod and second guide rod is fixed in the said containing hole.

3. voice coil motor as claimed in claim 2 is characterized in that, said containing hole is through hole or blind hole.

4. voice coil motor as claimed in claim 2 is characterized in that, has accepting hole on the said supporting body, and the other end of said first guide rod and second guide rod is fixed in the said accepting hole.

5. voice coil motor as claimed in claim 4 is characterized in that, said accepting hole is through hole or blind hole.

6. like the arbitrary described voice coil motor of claim 1 to 5, it is characterized in that said fixed mount and said supporting body opposing end faces have pilot hole and reference column respectively, said pilot hole and reference column match and make said supporting body be fixed on the said fixed mount.

7. voice coil motor as claimed in claim 6 is characterized in that, said voice coil motor comprises that further a housing is used to accommodate said fixed cell and mobile unit.