CN203056814U

CN203056814U - Ultraminiature voice coil motor

Info

Publication number: CN203056814U
Application number: CN 201320189275
Authority: CN
Inventors: 邵柏芝
Original assignee: GUI XIN MAGNETOELECTRIC HI-TECH Co Ltd
Current assignee: GUI XIN MAGNETOELECTRIC HI-TECH Co Ltd
Priority date: 2013-04-15
Filing date: 2013-04-15
Publication date: 2013-07-10
Anticipated expiration: 2023-04-15

Abstract

The utility model discloses an ultraminiature voice coil motor. The voice coil motor comprises a stop base fixedly arranged between a lens base and a base, wherein the upper end of the stop base extends into an inner ring of the base and forms the interference amount of a set value; the upper end of the stop base pushes the lens base to move, so that springs connected to the lens base deform; and spring deformation pre-pressure formed by the interference amount balances with external force causing deviation of the initial position of the voice coil motor. The voice coil motor solves the problem in the prior art that the interference amount is hard to determine; and by virtue of the independent stop base, not only can the interference amount be determined accurately, but also the magnetic flux efficiency can be enhanced and dust and foreign matters can be prevented from falling on image sensors to cause bad images.

Description

A kind of microminiature voice coil motor

Technical field

The utility model relates to a kind of microminiature voice coil motor.

Background technology

Be applied to the voice coil motor (as shown in Figure 1) of camera module in the prior art for preventing from when taking pictures, being subjected to the influence of gravity, do not influence because of angle and gravity for the original position that makes camera lens is stable, usually there are single or a plurality of springs in the voice coil motor structure, and spring can be connected with lens mount, in order to make voice coil motor not cause original position to depart from because of gravity or angle, voice coil motor can make lens mount produce a displacement earlier in design, and then make spring produce deflection, and the deflection of this spring has just formed the influence that existing precompression is revolted gravity.

The technology of existing voice coil motor is to produce an amount of interference so that the base of an ejection formation is next with lens mount, and when voice coil motor was installed, this amount of interference can make base that lens mount is pushed to and eliminate this amount of interference and cause camber of spring to produce precompression.

Fig. 2 is the branch body structure of existing voice coil motor, because lens mount and base are the part of ejection formation, often when penetrating, all can cause needing to revise jetting mold with the change amount of interference because of the combined tolerances of ejection formation and mould condition not, but because the fine setting of jetting mold is very difficult, especially when the precompressed amount is too many, mould even meeting can't change and must make again, and the time that spends and expense will make design case failure probability improve.

The utility model content

At the problem that prior art exists, the purpose of this utility model is to provide a kind of structure to advance improvement, is provided with the voice coil motor of stopping payment seat, and it efficiently solves the bigger problem of amount of interference error when base is installed in the prior art.

For achieving the above object, a kind of microminiature voice coil motor of the utility model, comprise the seat of stopping payment that is fixedly installed between lens mount and the base, the base inner ring is stretched in this upper end of stopping payment seat, and the amount of interference of formation set point, the upper end of stopping payment seat promotes lens mount and moves to make the camber of spring that connects on it, and the formed camber of spring precompression of amount of interference balances each other with the external force that causes the voice coil motor original position to depart from.

Further, described voice coil motor comprises loam cake, upper spring, enclosing cover, magnet, coil, described lens mount, lower spring, described base and the described seat of stopping payment, and described lens mount is by upper spring, lower spring clamping, and coil stationary is on described lens mount.

Further, the described seat of stopping payment is made for metal material.

Further, the described seat of stopping payment is made for magnetic conductive material.

Further, the described seat of stopping payment is the metal stamping goods.

Further, described lower end of stopping payment seat is provided with seal cover, sealing lid circumferentially is outward extended with the edge along it, perhaps at the side of described seal cover to being outside equipped with L type supporting leg, described edge and L type supporting leg are the described position limiting structure that seat moves at optical axis direction of stopping payment.

Further, pass through the fluid sealant integrated bond between the lower end of described edge, L type supporting leg and described base.

Further, the lower end of the described edge of described fluid sealant integral sealing, L type supporting leg and described base is to form the dust and moisture hermetically-sealed construction.

Further, the outline at described edge is circle, regular hexagon or square.

Further, the size of starting current is adjusted in the test macro feedback by described voice coil motor, sets the described seat of stopping payment in the described amount of interference of optical axis direction.

The utility model has solved the problem that amount of interference is difficult to determine in the prior art, independently stops payment seat by arranging, and not only can determine amount of interference accurately, can also increase magnetic flux efficient and prevent that dust fall and foreign matter from dropping to cause image bad on the image perceptron.

Description of drawings

Fig. 1 is for being applied to the voice coil motor of camera module in the prior art;

Fig. 2 is the branch body structure of existing voice coil motor

Fig. 3 is the utility model voice coil motor structural representation;

Fig. 4 is the split structural representation of the utility model voice coil motor;

Fig. 5 is A portion enlarged drawing among Fig. 3.

Embodiment

Below, with reference to the accompanying drawings, the utility model is more fully illustrated, exemplary embodiment of the present utility model has been shown in the accompanying drawing.Yet the utility model can be presented as multiple multi-form, and should not be construed as the exemplary embodiment that is confined to narrate here.But, these embodiment are provided, thereby make the utility model comprehensively with complete, and scope of the present utility model is fully conveyed to those of ordinary skill in the art.

In order to be easy to explanation, here can use such as " on ", D score " left side " " right side " the space relative terms of etc.ing, for element shown in the key diagram or the feature relation with respect to another element or feature.It should be understood that except the orientation shown in the figure spatial terminology is intended to comprise the different azimuth of device in using or operating.For example, if the device among the figure is squeezed, be stated as the element that is positioned at other elements or feature D score will be positioned at other elements or feature " on ".Therefore, the exemplary term D score can comprise upper and lower orientation both.Device can otherwise be located (revolve turn 90 degrees or be positioned at other orientation), and the used here relative explanation in space can correspondingly be explained.

Extremely shown in Figure 5 as Fig. 3, a kind of microminiature voice coil motor of the utility model, comprise loam cake 1, upper spring 2, enclosing cover 3, magnet 4, coil 5, described lens mount 6, lower spring 7, base 8 and stop payment seat 9, lens mount 6 is by upper spring 2, lower spring 7 clampings, coil 5 is fixed on the lens mount 6, stopping payment seat 9 is fixedly installed between lens mount 6 and the base 8, stop payment the upper end of seat 9 and stretch into base 8 inner rings, and the amount of interference of formation set point, the upper end of stopping payment seat 9 promotes lens mount and moves to make the camber of spring that connects on it, and the formed camber of spring precompression of amount of interference balances each other with the external force that causes the voice coil motor original position to depart from.

The magnet 4 of 4 sheets is arranged in the enclosing cover 3 of rectangle, forms permanent magnet unit; Lens mount 6 by split type upper spring 2, lower spring about in the of 7 clamping be installed in the enclosing cover 3; Coil 5 is by the coiling of thermoset forming high temperature self-adhesion copper conductor, and suit is fixed on the lens mount 6.Its mechanical location is positioned at the outer side clearance that is made of magnet 4 and enclosing cover 3 outer walls.So just formed the N utmost point from magnet 4, through enclosing cover 3 outer walls, diapire, inwall, passed coil 5, returned a closed magnetic circuit of the S utmost point of magnet 4 at last, this also is effective magnetic loop of the microminiaturizationvoice voice coil motor needs that relate to of the utility model.

During to coil 5 energising, permanent magnet unit applies with upper spring 2, lower spring 7 to the opposite magnetic field force of lens mount 6 to coil 5 and related lens mount 6 thereof, and under the magnetic field force effect of permanent magnet unit 7, coil 5 drive lens seats 6 move.Power by electric current in the regulating winding 5 changes, thereby realizes that lens mount 6 moves forward and backward the accurate control of displacement; Make lens mount 6 be returned to initial position by the mechanical return force by magnetic field active force and upper spring 2, lower spring 7.

Upper spring 2, lower spring 7 are all made by specifically developed a kind of copper, nickel, tin alloy material, the hardness of this material, elasticity, processing technology, fatigue resistance, conductivity, easily go up comparison common materials such as tin and have very significantly and improve.Upper spring 2, lower spring 7 have the inner and outer ring edge of concentric structure, and the ring edge is realized radial location by concavo-convex screens and lens mount 6.Reach capacity behind the position when move forward and backward the interior ring edge displacement that drives upper spring 2, lower spring 7 owing to lens mount 6, reply and lens mount 6 is retracted the preliminary examination position with withing joint efforts, so possess good axial resistance to impact by upper spring 2, lower spring 7.Upper spring 2 adopts the full slice system design, only bears the function that axial mechanical return force and radial alignment guarantee, but bears the electric current guiding function without it, so do not need to draw lead and its welding from lens mount 6 middle punches especially.

Enclosing cover 3 adopts ferrimagnet (for example stainless iron) to make.And magnet 4 is made by rare earth epistasis permanent magnetic material.The magnetic line of force direction of magnet 4 by improving the ferromagnetic material grade, improves magnetism intensity for radially, and compensation is owing to the magnetic force that volume reduces to produce weakens problem.

Lens mount 6 is made by insulating material (for example synthetic resin etc.), and lens mount 6 is for simply being furnished with the cylinder of internal thread.The special design in lens mount 6 rear ends has boss, plays the installation positioning function of lower spring 7.

Loam cake 1 and base 8 are made by insulating material (for example synthetic resin etc.), particularly point out the utility model simple concavo-convex position engaging is provided, and are equipped with glued fixingly, are distributed in junction, four angles (can referring among Fig. 8 12) respectively.The back-off design of abandoning tradition can fully save and radially reach axial space.Can hold lens mount 6, fixedly permanent magnetic field unit, upper spring 2, lower spring 7, and they closely are fastened togather.Namely made things convenient for produce in batches fast to bit manipulation, the structure that also makes whole device more closely, more firm.

Stop payment seat 9 and be the metal stamping goods, can reach the advantage of rapid adjustment precompressed amount by adjusting punching press amount or the off-position of mould.Stop payment seat 9 and make for metal material, further, stop payment seat 9 and can adopt magnetic conductive material to make, magnetic conductive material can increase magnetic flux efficient, and prevents the electronic building brick of magnetic flux interference voice coil motor below.

The lower end of stopping payment seat 9 is provided with seal cover 10, seal cover 10 circumferentially is outward extended with edge 11 along it, perhaps at the side of seal cover 10 to being outside equipped with L type supporting leg (not shown), edge 11 and L type supporting leg are to stop payment the position limiting structure that seat 9 moves at optical axis direction.

Pass through fluid sealant 12 integrated bond between the lower end of edge 11, L type supporting leg and base 8, the lower end of fluid sealant 12 integral sealing edges 11, L type supporting leg and base 8, to form the dust and moisture hermetically-sealed construction, when this dust and moisture hermetically-sealed construction can effectively prevent lens mount 6 motions, dust and the foreign matter of stopping payment seat 9 outsides enter in the voice coil motor, drop on the image perceptron, and influence imaging.The outline at edge 11 can be set to shapes such as circle, regular hexagon, square.

In the utility model, can stop payment seat at 9 o'clock in assembling, its size in the amount of interference 13 of optical axis direction is adjusted in the location, adjust the size of starting current by the test macro feedback of voice coil motor, set and stop payment seat 9 amount of interference 13 at optical axis direction, this location adjustment mode can increase the consistency of quality effectively, to reach out the requirement of circuit controls.

Claims

1. microminiature voice coil motor, it is characterized in that, this voice coil motor comprises the seat of stopping payment that is fixedly installed between lens mount and the base, the base inner ring is stretched in this upper end of stopping payment seat, and the amount of interference of formation set point, the upper end of stopping payment seat promotes lens mount and moves to make the camber of spring that connects on it, and the formed camber of spring precompression of amount of interference balances each other with the external force that causes the voice coil motor original position to depart from.

2. voice coil motor as claimed in claim 1, it is characterized in that, described voice coil motor comprises loam cake, upper spring, enclosing cover, magnet, coil, described lens mount, lower spring, described base and the described seat of stopping payment, described lens mount is by upper spring, lower spring clamping, and coil stationary is on described lens mount.

3. voice coil motor as claimed in claim 1 is characterized in that, the described seat of stopping payment is made for metal material.

4. voice coil motor as claimed in claim 3 is characterized in that, the described seat of stopping payment is made for magnetic conductive material.

5. voice coil motor as claimed in claim 4 is characterized in that, the described seat of stopping payment is the metal stamping goods.

6. voice coil motor as claimed in claim 1, it is characterized in that, described lower end of stopping payment seat is provided with seal cover, the sealing lid circumferentially is outward extended with the edge along it, perhaps at the side of described seal cover to being outside equipped with L type supporting leg, described edge and L type supporting leg are the described position limiting structure that seat moves at optical axis direction of stopping payment.

7. voice coil motor as claimed in claim 6 is characterized in that, passes through the fluid sealant integrated bond between the lower end of described edge, L type supporting leg and described base.

8. voice coil motor as claimed in claim 7 is characterized in that, the lower end of the described edge of described fluid sealant integral sealing, L type supporting leg and described base is to form the dust and moisture hermetically-sealed construction.

9. voice coil motor as claimed in claim 6 is characterized in that, the outline at described edge is circle, regular hexagon or square.

10. voice coil motor as claimed in claim 1 is characterized in that, the size of starting current is adjusted in the test macro feedback by described voice coil motor, sets the described seat of stopping payment in the described amount of interference of optical axis direction.