CN103199666A

CN103199666A - Voice coil motor

Info

Publication number: CN103199666A
Application number: CN201210005780XA
Authority: CN
Inventors: 游祥杰
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: 2012-01-10
Filing date: 2012-01-10
Publication date: 2013-07-10

Abstract

The invention relates to a voice coil motor used for driving a lens module to move. The voice coil motor comprises a fixed unit and a movable unit. The fixed unit comprises a fixed frame, four first magnets and four second magnets, wherein the fixed frame is roughly of a cubic structure, an accommodating space is arranged in a geometric center of the fixed frame, a first magnet is arranged on each of four walls of the fixed frame, and a second magnet is fixedly arranged on each of four corners of the fixed frame. The movable unit is movably accommodated in the accommodating space of the fixed frame. The movable unit comprises a movable frame, a first coil and four second coils. The movable frame is provided with an accommodating space for accommodating the lens module, the first coil corresponding to the first magnets is twined on the outer side of the movable frame, the second coils corresponding to the second magnets are arranged on four corners of the movable frame, the first magnets drive the first coil to drive the movable frame to move along the direction parallel to an optical axis, and an included angle formed by the movable frame and the optical axis can be adjusted through mutual coordination of the second magnets and the second coils. The voice coil motor can prevent the lens module from tilting in the process of moving.

Description

Voice coil motor

Technical field

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

Background technology

Voice coil motor generally comprises active unit, fixed cell and shell fragment, and active unit is suspended in the fixed cell by shell fragment, and active unit has coil, and fixed cell has magnet, the coil of energising can be subjected to magnet magnetic field effect and move.

Because unavoidably there is the error of assembly error or above-mentioned each component design in voice coil motor in assembling process, for example, shell fragment is not symmetrically distributed to the active force of the active unit optical axis about the camera lens module, thereby the optical axis that the direction of motion that makes the camera lens module can not paralleloscope head mould group, so that camera lens module run-off the straight, can not accurately focus or zoom, to influence the image quality of camera lens module.

Summary of the invention

In view of this, be necessary to provide a kind of voice coil motor of adjusting the active unit inclination angle.

A kind of voice coil motor, be used for driving the motion of camera lens module, described camera lens module has optical axis, described voice coil motor comprises: fixed cell, comprise fixed mount, four first magnet and four second magnet, described fixed mount is roughly cube structure and geometric center has spatial accommodation, is respectively arranged with first magnet on the sidewall of described fixed mount, and four corners of described fixed mount fixedly have second magnet respectively; And active unit, be contained in versatilely in the spatial accommodation of described fixed mount, described active unit comprises adjustable shelf, first coil and four second coils, described adjustable shelf has to accommodate the spatial accommodation of described camera lens module, corresponding described first magnet of described first coil is wrapped in the described adjustable shelf outside, corresponding described second magnet of described second coil arranges four jiaos of described adjustable shelf, described first magnet is used for matching with described first coil and drives described adjustable shelf and move along the direction of parallel optical axis, and described second magnet is used for matching to adjust angle between described adjustable shelf and the optical axis with described second coil.

Compared to prior art, second magnet orders about active unit adjustment inclination direction to the voice coil motor of the embodiment of the invention on cornerwise second coil of adjustable shelf and the fixed mount by being arranged on, so that the direction of motion parallel optical axis direction of camera lens module.

Description of drawings

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

Fig. 2 is the decomposing schematic representation of Fig. 1.

Fig. 3 is the decomposing schematic representation of another angle of Fig. 1.

The main element symbol description

Voice coil motor	10
		Housing	11
Central through hole	110
		Loam cake	12
Last location hole	121
		Last shell fragment	13a
Following shell fragment	13b
		Light hole
	130
		First location hole	131
Breach	132
		Second location hole	133
Elastic part	134
		Active unit	14
Adjustable shelf	141
		First spatial accommodation	1410
First reference column	1411
		Projection	1412
First coil	142
		Second coil	143
Fixed cell	15
		Fixed mount	151
Second spatial accommodation	1510
		Second reference column	1511
Following location hole	1512
		Opening	1513
First magnet	152
		Second magnet	153
Supporting body	16
		Following reference column	161

Following embodiment will further specify the present invention in conjunction with above-mentioned accompanying drawing.

Embodiment

See also Fig. 1, Fig. 2 and Fig. 3, the voice coil motor 10 that the embodiment of the invention provides is used for driving camera lens module (not shown) and moves to realize focusing or zoom function and can prevent that the camera lens module is in the motion process medium dip.

Voice coil motor 10 comprises housing 11, loam cake 12, last shell fragment 13a, following shell fragment 13b, active unit 14, fixed cell 15 and supporting body 16.

Housing 11 has a central through hole 110 and is used for making light to enter, and housing 11 is used for loam cake 12, last shell fragment 13a, following shell fragment 13b, active unit 14 and fixed cell 15 to prevent the extraneous function that also can have anti-electromagnetic interference to the interference of said modules.

Loam cake 12 is roughly square structure, and four jiaos respectively arrange one and go up location hole 121.

Last shell fragment 13a is square structure, and the center has a light hole 130.Four jiaos of last shell fragment 13a respectively have first location hole 131, the breach 132 that has two circular arcs between online two first location holes 131 in diagonal angle, namely go up shell fragment 13a and have four breach 132 altogether, online two breach 132 in diagonal angle are between two first location holes 131, and breach 132 is symmetrical arranged about the central shaft of light hole 130.

The structure of the structure of following shell fragment 13b and last shell fragment 13a is basic identical: have 130, four jiaos of light holes and have first location hole 131 respectively; Different being in has two online second location holes 133 of two second location holes 133 and diagonal angle between two first location holes 131 between two online first location holes 131 of: following shell fragment 13b diagonal angle.

Part between first location hole 131 and breach 132 and first location hole 131 and second location hole 133 is elastic part 134, after the elastic part 134 feasible external force that are applied on shell fragment 13a and the following shell fragment 13b disappeared, last shell fragment 13a and following shell fragment 13b can recover original shape.

Active unit 14 comprises adjustable shelf 141, first coil 142 and second coil 143.Wherein, adjustable shelf 141 is the square shape of first spatial accommodation 1410 that has to accommodate the camera lens module, and first coil 142 is wrapped in the periphery of adjustable shelf 141, and second coil 143 is positioned at four corners of adjustable shelf 141 and is positioned at the outside of first coil 142.

Adjustable shelf 141 has the projection 1412 of corresponding breach 132 near the end of last shell fragment 13a, the close end of shell fragment 13b down has first reference column 1411 of corresponding second location hole 133, last shell fragment 13a is fixed on an end of adjustable shelf 141 by projection 1412 and breach 132 and binding site adhesive process, and shell fragment 13b is fixed on the other end of adjustable shelf 141 by first reference column 1411 and second location hole 133 and binding site adhesive process down.

Fixed cell 15 comprises fixed mount 151, first magnet 152 and second magnet 153.The shape of the shape of fixed mount 151 and adjustable shelf 141 is roughly the same, and the geometric center of fixed mount 151 has second spatial accommodation 1510 that holds active unit 14.

Fixed mount 151 has second reference column 1511 near the end of last shell fragment 13a, and the close end of shell fragment 13b down has following location hole 1512.Second reference column 1511 passes first location hole 131 of shell fragment 13a and stretches into the last location hole 121 of loam cake 12, by gluing process shell fragment 13a is fixed between fixed mount 151 and the loam cake 12 again.

In addition, having opening 1513, the first magnet 152 on the sidewall of fixed mount 151 is arranged in the opening 1513 and first coil 142 of corresponding active unit 14.Second magnet 153 is arranged on four corners of fixed mount 151 with second coil 143 of corresponding active unit 14.

Produce magnetic field force between first coil 142 of first magnet 152 and energising, magnetic field force drives adjustable shelf 141 motions, and the adjustable shelf 141 of motion drives the motion in second spatial accommodation 1510 together of camera lens module.

Supporting body 16 is square structure, four jiaos respectively have a following reference column 161, and following reference column 161 stretches into down in the following location hole 1512 of first location hole 131 of shell fragment 13b and fixed mount 151 and by gluing process and will descend shell fragment 13b to be fixed between fixed mount 151 and the supporting body 16.

Introducing voice coil motor 10 below drives camera lens module realization focusing or zoom function and can prevent the course of work of camera lens module in the motion process medium dip:

Feed electric current in first coil 142 of active unit 14, first coil 142 of energising can be subjected to the effect of magnetic field force in the magnetic field of first magnet 152 of fixed cell 15, can draw the direction of motion of first coil 142 according to left hand rule, because first coil 142 is wrapped on the adjustable shelf 141, and adjustable shelf 141 is suspended in second spatial accommodation 1510 of fixed mount 151 by last shell fragment 13a and following shell fragment 13b, so, the direction of motion of first coil 142 is the direction of motion of adjustable shelf 141, be the direction of motion of camera lens module, thereby realize that voice coil motor 10 drives the motion of camera lens module.

The size and Orientation of the electric current by change feeding first coil 142 can change the stressed size and Orientation of adjustable shelf 141, thereby the displacement of camera lens module and direction are changed, and realizes the function of focusing or zoom.

If there is an angle between the optical axis of the direction of motion of camera lens module and camera lens module, feed electric current (direction of adjusting is judged sense of current as required) to cornerwise two second coils 143, second coil 143 of energising is subjected to the effect of the magnetic field force of second magnet 153 and orders about adjustable shelf 141 adjustment inclination directions, so that the direction of motion parallel optical axis direction of camera lens module.

Be understandable that those skilled in the art also can do other variation etc. and be used in 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.The variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.

Claims

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

Fixed cell, comprise fixed mount, four first magnet and four second magnet, described fixed mount is roughly cube structure and geometric center has spatial accommodation, be respectively arranged with first magnet on the sidewall of described fixed mount, four corners of described fixed mount fixedly have second magnet respectively; And

Active unit, be contained in versatilely in the spatial accommodation of described fixed mount, described active unit comprises adjustable shelf, first coil and four second coils, described adjustable shelf has to accommodate the spatial accommodation of described camera lens module, corresponding described first magnet of described first coil is wrapped in the described adjustable shelf outside, corresponding described second magnet of described second coil arranges four jiaos of described adjustable shelf, described first magnet is used for matching with described first coil and drives described adjustable shelf and move along the direction of parallel optical axis, and described second magnet is used for matching to adjust angle between described adjustable shelf and the optical axis with described second coil.

2. voice coil motor as claimed in claim 1 is characterized in that, has opening on the sidewall of described fixed mount, and described first magnet is fixed in the described opening.

3. voice coil motor as claimed in claim 1 or 2, it is characterized in that, described voice coil motor further comprises shell fragment and following shell fragment, described upward shell fragment is fixed on an end of described fixed mount and adjustable shelf, described shell fragment down is fixed on the other end of described fixed mount and adjustable shelf, so that described adjustable shelf is suspended in the described fixed mount.

4. voice coil motor as claimed in claim 3, it is characterized in that, the described shell fragment of going up has first location hole and breach, corresponding described first location hole of described fixed mount and adjustable shelf and breach have first reference column and projection respectively, described breach and projection cooperate is fixed on the described adjustable shelf the described shell fragment of going up, and reference column matches the described shell fragment of going up is fixed on the described fixed mount on described first location hole and first.

5. voice coil motor as claimed in claim 4, it is characterized in that, described down shell fragment has second location hole, and corresponding described second location hole has first reference column on the described adjustable shelf, and described first reference column stretches in described second location hole so that described shell fragment down is fixed on the described adjustable shelf.

6. voice coil motor as claimed in claim 5, it is characterized in that, described voice coil motor further comprises supporting body, described supporting body has following reference column, described fixed mount has following location hole, described down shell fragment has the corresponding described location hole of reference column down, and described reference column down stretches in the location hole of described location hole down and described shell fragment down so that described shell fragment down is fixed between described fixed mount and the supporting body.

7. voice coil motor as claimed in claim 6 is characterized in that, described voice coil motor further comprises loam cake, and described loam cake has last location hole, and described second reference column stretches into described going up in the location hole so that described loam cake is fixed on the described fixed mount.