WO2014079345A1

WO2014079345A1 - Multipurpose micro voice coil motor

Info

Publication number: WO2014079345A1
Application number: PCT/CN2013/087301
Authority: WO
Inventors: 吴发权; 王万军
Original assignee: 辽宁中蓝电子科技有限公司
Priority date: 2012-11-20
Filing date: 2013-11-18
Publication date: 2014-05-30
Also published as: CN102957297B; CN102957297A

Abstract

A multipurpose micro voice coil motor, comprising: a magnet yoke body (1), a first gasket (2), an upper shrapnel (3), a coil (4), a coil frame (5), a permanent magnet (6), a second gasket (7), a lower shrapnel (8) and a base (9). The magnet yoke body (1) and the base (9) are arranged in a mutally cooperative manner, so that a closed space for accommodating the first gasket (2), the upper shrapnel (3), the coil (4), the coil frame (5), the permanent magnet (6), the second gasket (7) and the lower shrapnel (8) is formed. The magnet yoke body (1) is integrally shaped by punching with a metal material. Through the cooperation of the magnet yoke body (1) and the base (9), the number of component parts of the motor is reduced, and the manufacturing procedure of the motor is simplified.

Description

Description A multi-purpose miniature voice coil motor

Technical field

The invention relates to the technical field of voice coil motors, and in particular to a multi-purpose micro voice coil motor for automatic focusing of a camera.

Background technique

The voice coil motor is a miniature displacement drive motor, which has the characteristics of small rotor stroke displacement, small product volume, fast response speed, low cost, low power consumption, and accurate stroke displacement. Since the voice coil motor has the above characteristics, recent micro-optics such as a camera in a mobile phone, a camera in a notebook computer, a camera in a tablet computer, etc. use a voice coil motor as an actuator for driving the lens in the camera along the optical axis. The direction is moved to achieve automatic focusing.

The voice coil motor uses Ampere's law for the left hand rule: that is, the energized coil receives a force perpendicular to the direction of the magnetic field and the direction of the current in the magnetic field generated by the permanent magnet, and changes the magnitude of the input current to change the force applied to the energized solenoid. The voice coil motor uses this principle to change the electromagnetic force of the solenoid by changing the current in the coil, thereby changing the displacement of the solenoid in the magnetic field to achieve mechanical movement of other components driven by the motor. At present, the chip driver input current size resolution can be made very small and accurate, so the voice coil motor has a very high precision in controlling the displacement, so that the voice coil motor controls the distance between the lens and the image sensor in the camera module. Very precise.

For example, the Chinese patent document CN 102347679 A discloses a "voice coil motor" comprising: a rotor comprising a cylindrical bobbin for accommodating a lens and having both ends open, and a coil assembly including a coil wound around the periphery of the bobbin a stator including a cylindrical yoke formed with an opening for exposing the lens, a plurality of magnets placed inside the yoke and opposed to the coil assembly, and magnets placed inside the yoke to fix the plurality of magnets And an elastic member elastically supporting the bobbin. Use the sound of this structure The ring motor has the following drawbacks:

1. The connecting elastic unit (ie, the elastic wire) in the first elastic member and the second elastic member only uses a simple circuitous structure, so that the elastic wire structure can only generate a small centripetal tension during the movement of the motor, thereby The angle formed by the dynamic and static axis of the rotor bobbin is relatively large, generally at an offset angle of 13 or more (0.2 Γ or more), which affects the focusing effect, resulting in poor quality of the high-pixel mobile phone;

2. The housing made of plastic is connected to the top of the yoke and covers the upper end of the yoke. The lower end of the yoke is connected to the substrate. Since the top of the yoke is covered by the plastic casing, the motor casing cannot be shielded. The interference of electromagnetic waves generated by various components in the vicinity, which affects the accuracy of the motor operation. At the same time, since the housing is made of plastic material, the strength is insufficient in terms of impact resistance and vibration;

3. Adding a metal cover box outside the yoke to cover the yoke shell and connect it to the substrate, which not only increases the cost of the motor, but also complicates assembly and processing. At the same time, due to the size of the entire motor, Increasing the cover box will inevitably make the internal space of the motor smaller, resulting in a smaller size of the permanent magnet and the coil of the motor, thereby reducing the driving force of the motor and affecting the performance of the motor;

4. The contact structure between the bobbin and the substrate is a structure in which the convex portion is in contact with the plane, so that dust and the like inside the motor pass through the gap between the convex portion of the bobbin and the substrate, and enter the photosensitive chip of the camera, affecting Shooting quality;

5. The pole piece on the first elastic member is connected to the second elastic member by welding. Due to the small volume of the pole piece, the difficulty and the workload of welding the pole piece are very large, the welding quality cannot be guaranteed, and the welding is impossible. The strength of the pole pieces is often not high and the service life is relatively low.

Summary of the invention

An object of the present invention is to provide a multi-purpose micro voice coil motor which can make the machining process of the motor simpler by using the metal yoke body as the motor casing, and can increase the cooperation of the coil and the permanent magnet when the motor size is constant. The area, thus increasing the motor drive force. Another object of the present invention is to provide a multi-purpose micro voice coil motor which can increase the strength of the entire motor and protect the safety of the parts inside the motor by integrally molding the yoke body with a metal material, and is made of a metal material. The yoke body can shield electromagnetic waves generated by various components near the motor.

Another object of the present invention is to provide a multi-purpose micro voice coil motor. By changing the elastic structure of the upper elastic piece and the lower elastic piece, the elastic wire can generate a large centripetal tension during the focusing process, thereby making the rotor The angle between the axis of the wire frame and the static is the smallest, so that the shooting effect is better.

Another object of the present invention is to provide a multi-purpose micro voice coil motor. By arranging a plurality of elastic wires symmetrically and evenly, each of the elastic wires generates a relatively large and identical centripetal tension during the focusing process, and further It ensures that the angle formed by the dynamic and static axis of the rotor bobbin is the smallest.

To this end, the present invention uses the following technical solutions:

A multi-purpose micro voice coil motor comprising a yoke body, a first gasket, a spring elastic sheet, a coil, a wire frame, a permanent magnet, a second gasket, a lower elastic piece and a base, wherein the magnetic yoke body and the base are mutually In cooperation, a closed space for accommodating the first gasket, the upper elastic piece, the coil, the wire frame, the permanent magnet, the second gasket and the lower elastic piece is formed, and the yoke body is integrally formed by stamping with a metal material.

As a preferred embodiment of the multi-purpose micro voice coil motor, the yoke body includes a rectangular or square yoke bottom plate, the yoke bottom plate is provided with a yoke side frame, and the yoke bottom plate is provided with a yoke through hole at the center a plurality of yoke columns are annularly disposed on the same side of the yoke through hole and on the same side of the yoke side frame, and the yoke column is disposed in parallel with the yoke side frame on the yoke bottom plate a yoke groove is disposed on a side of the yoke through hole near the yoke side frame;

The first spacer is disposed in the yoke body, and the first spacer includes a first support ring that cooperates with the yoke bottom plate, and the upper four corners of the first support ring correspond to the four corners of the yoke side frame Sheet column, A first pad convex portion is disposed on a side of the first support ring near the center.

Further, the yoke body and the first gasket are bonded together by an adhesive.

Preferably, the adhesive is a synthetic resin adhesive.

Further, the yoke body is made of a highly magnetically conductive, ductile metal material.

More preferably, the yoke body is made by stamping a thin steel plate.

More preferably, the yoke body is made by stamping a thin copper plate.

Further, the first spacer is made of an insulating material.

Preferably, the first gasket is directly injection molded from plastic.

As a preferred solution of the multi-purpose micro voice coil motor, the upper elastic piece is disposed in the first support ring of the first gasket, and the upper elastic piece includes a first outer frame, a first inner frame and a first elastic wire. The first outer frame is provided with a first outer frame groove corresponding to the first pad convex portion, and the first inner frame is provided with a first fixing hole for fixing the wire frame, the first fixing hole a plurality of first fixing grooves are disposed in the inner ring, the yoke column passes through a gap between the first outer frame and the first inner frame, and the upper elastic piece is fixed in the yoke body, the first An elastic wire includes at least six curved curved portions and two straight portions, and the straight portion and the curved portion are tangentially coupled by a straight line and an arc, the first elastic wire and the first wire respectively The outer frame, the first inner frame is curvedly connected.

Preferably, the first elastic wire comprises an eight-section curved portion and two straight portions, which are a first curved portion, a second curved portion, a third curved portion, a fourth curved portion, and a first a fifth curved portion, a sixth curved portion, a seventh curved portion, an eighth curved portion, a first straight portion, and a second straight portion, and the first curved portion, the second curved portion, and the first curved portion The three arc-shaped portion and the fourth curved portion are sequentially coupled by arc tangent to form a first S-shaped elastic portion, the fifth curved portion, the sixth curved portion, the seventh curved portion and the eighth arc The shape is coupled into the second S-shaped elastic portion by the arc tangent, the first inner frame, the first straight portion, the first S-shaped elastic portion, the second S-shaped elastic portion, a second straight portion, the first outer frame is sequentially connected, and the first inner frame is The first straight portion, the first outer frame and the second straight portion are each connected by an arc transition, the first straight portion and the first s-shaped elastic portion, the second straight line The second S-shaped elastic portion is tangentially coupled by a straight line and an arc, and the first S-shaped elastic portion and the second S-shaped elastic portion are tangentially coupled by an arc and an arc.

As a preferred embodiment of the multi-purpose micro voice coil motor, the wire rack includes a wire frame top and a wire frame bottom, the wire frame top is fixed by a first inner frame of the upper elastic piece, and the wire frame top is disposed The first fixing groove of the upper elastic piece matches the top convex part of the wire frame, and the wire frame light-passing hole is arranged between the top of the wire frame and the bottom of the wire frame, and the top of the wire frame and the bottom of the wire frame are opposite to each other. The wire frame through hole defines a wire frame outer wall, and the outer wall of the wire frame is provided with a wire frame groove matched with the yoke column, and the wire frame is disposed on the bottom of the wire frame and the wire frame through hole a wire frame convex tooth is disposed on a side of the wire frame dustproof ring adjacent to the outer wall of the wire frame, and two wire frame bottom convex portions are symmetrically disposed near the outer wall of the wire frame at the bottom of the wire frame, the outer wall of the wire frame The coil is placed on it.

Preferably, the wire frame is injection molded by a synthetic resin material, so that the wire frame has the characteristics of compact size, small thermal expansion coefficient, electrical insulation, no dust generation, rapid mass production and the like.

Preferably, the coil is arranged in a cylindrical shape or a square shape or an irregular shape.

More preferably, the coil is wound on the wire frame on the outer wall of the wire frame and forms an integral structure with the wire frame.

As a preferred embodiment of the multi-purpose micro voice coil motor, the permanent magnet is disposed between the two shims and the yoke side frame, and the permanent magnet includes a first magnet and a second magnet. And a third magnet and a fourth magnet, wherein the first magnet, the second magnet, the third magnet, and the fourth magnet are thin strip magnets, and a magnetic surface of the permanent magnet is parallel to the coil surface.

As a preferred embodiment of the multi-purpose micro voice coil motor, the lower elastic piece includes a second outer frame, a second inner frame and a second elastic wire, and the second outer frame is arranged along the center of the lower elastic piece, the first The second inner frame is also Separatingly disposed along a center of the lower elastic piece, the second inner frame has a second fixing hole for fixing the bottom of the wire frame, and a side of the second inner frame adjacent to the second outer frame corresponds to the a second fixing groove is disposed on the bottom convex portion of the wire frame, the second elastic wire includes at least six curved curved portions and two straight portions, and the straight portion and the curved portion are tangent to the curved line and the curved line Coupling, the second elastic wires are respectively connected to the second outer frame and the second inner frame, and two second poles are disposed on the second outer frame. The second inner frame in which the pole pieces are located is respectively soldered to the start line and the end line of the coil.

When the second outer frame and the second inner frame are separated by a non-closed structure whose center is separated into two parts, the insulation function can be realized, and the insulation function is not required to be separately provided, thereby simplifying the process and saving parts. A further reduction in costs.

Further, the second outer frame and the pole piece are of a unitary structure, and are formed by bending. By integrally forming the pole piece on the second outer frame, the process of welding the pole piece on the second outer frame is reduced, and the conventional welding process of the positive and negative terminals and the elastic piece is overcome, and it is difficult to ensure the yield rate; It saves the use of parts and saves costs.

Preferably, the second elastic wire comprises a six-segment curved portion and a three-segment straight portion, which are a ninth arc portion, a tenth arc portion, an eleventh arc portion, and a twelfth arc portion, respectively. a thirteenth arc portion, a fourteenth arc portion, a fifteenth arc portion, a sixteenth arc portion, a third straight portion, a fourth straight portion, and a fifth straight portion, and the ninth arc The shape, the tenth arc portion, the eleventh arc portion, and the twelfth arc portion are sequentially coupled by arc tangent to form a third s type elastic portion, the thirteenth curved portion, the tenth The four arc-shaped portion, the fifteenth curved portion, and the sixteenth curved portion are sequentially coupled by arc tangentially into a fourth S-shaped elastic portion, the second inner frame, the third straight portion, and the second a third S-type elastic wire portion, a fourth straight portion, a fourth S-shaped elastic portion, the fifth straight portion, and the second outer frame are sequentially connected, and the second inner frame and the third straight portion are The second outer frame and the fifth straight portion are each connected by an arc transition, the third straight portion and the third portion

S-type elastic wire portion, the fourth straight portion, the third S-type elastic wire portion and the fourth S-shaped elastic wire portion, The fourth S-type elastic portion and the fifth straight portion are tangentially coupled by a straight line and an arc.

By changing the structure of the first elastic wire and the second elastic wire, the structure includes at least two S-shaped elastic portions arranged in a non-linear arrangement, which increases the structural stability of the elastic piece, so that the motor rotor wire frame is in motion The average angle between the axis and the static axis of the centerline frame can be controlled within 0.12 °, which is much smaller than the average angle between the dynamic and static of the wire frame axis during the movement of the conventional motor rotor frame. , produced unexpected technical effects, and played a decisive role in ensuring the focus effect. It will be understood by those skilled in the art that any elastomeric structure having at least six arcuate portions that can constitute at least two S-shaped filament portions in a non-linear arrangement can be adapted to the present invention.

More preferably, the upper elastic piece and the lower elastic piece are made of other metal composite plates such as nickel and copper. Preferably, the first elastic wire and/or the second elastic wire have the same thickness from the beginning to the end, and the width from the beginning to the end is narrowed or narrowed by a wide gradient;

Or, the first end of the first elastic wire and/or the second elastic wire has the same width from the beginning to the end, and the thickness from the beginning to the end is thinned by thickness or a uniform gradient from thin to thick.

Through the above design, the purpose of eliminating the stress concentration of the elastic wire during the movement of the wire frame can be achieved.

As a preferred embodiment of the multi-purpose micro voice coil motor, the second spacer is disposed between the permanent magnet and the second outer frame of the lower elastic piece, and is used for the second outer frame of the lower elastic piece Pressing on the base, the second spacer includes a second support ring that cooperates with the shape of the second outer frame, and the four corners of the second support ring are recessed inward with a spacer groove.

As a preferred solution of the multi-purpose micro voice coil motor, the base center is provided with a through hole of the base, and the outer periphery of the through hole of the base corresponds to the dustproof ring of the wire frame to provide a base dust ring, and the base dust ring A step of a dust seal inner ring for supporting the wire frame dust ring is disposed between the light passing hole of the base, and a side of the base dust ring that is away from the center of the light passing hole of the base is respectively disposed a base groove corresponding to the convex part of the wire frame and the convex part of the bottom of the wire frame, and the groove of the second gasket is arranged at the four corners of the base With the base column.

As a preferred embodiment of the multi-purpose micro voice coil motor, four yoke protrusions are uniformly distributed on each frame of the yoke side frame, and one yoke convex portion is provided with one for securing the yoke a grounding terminal having a stable electromagnetic field inside the body, wherein the yoke convex portion is provided with a latching groove on the side of the base, so that the yoke body and the base can be snap-fitted together, and one of the latching slots is The two sides of the pole piece are provided with a pole piece through hole for the passage of the pole piece.

As a preferred solution of the multi-purpose micro voice coil motor, the first elastic wire and the second elastic wire have four groups, and the four first elastic wires are symmetrically distributed on the first outer frame and Between the first inner frames, four sets of the second elastic wires are symmetrically distributed between the second outer frame and the second inner frame.

Through the above design, four sets of elastic wires are arranged symmetrically and evenly, so that each set of elastic wires will produce a centripetal tension of the same size during the movement of the wire frame, thereby ensuring the dynamic and static of the wire frame axis during the movement of the wire frame. The angle formed by the time is the smallest, thereby ensuring the focusing effect.

The beneficial effects of the invention are:

1. By covering the entire product with a metal yoke body and using the base and the yoke body to seal the motor product inside the yoke body, the strength of the motor is increased, and no other shell is used. The body covers the motor, which increases the space inside the motor, increases the size of the permanent magnet and the coil, increases the driving force of the motor, improves the performance of the motor, and the yoke body assumes multiple roles in the motor, further reducing the motor. The number of component parts reduces the manufacturing process and assembly difficulty;

2. By using a special elastic wire structure in the voice coil motor of the present invention, the average value of the angle formed by the dynamic and static state of the rotor wire frame axis during the operation of the motor can be controlled within 0.12°, The lens is fixed on the rotor wire frame, so that the angle formed by the lens optical axis dynamic and static is minimized during the focusing process, which ensures the focusing effect;

3. Set the base dust ring by the base light-passing hole on the base away from the center, and online The wire frame of the frame is provided with a dustproof ring corresponding to the base dust ring, which can effectively prevent foreign matter inside the voice coil motor from falling onto the photosensitive chip, and further improve the shooting quality of the camera.

DRAWINGS

1 is a schematic exploded view of a multi-purpose micro voice coil motor according to the present invention;

Figure 2 is a schematic view of the structure of Figure 1 after assembly;

Figure 3 is a cross-sectional view of the A-A of Figure 2;

Figure 4 is a schematic perspective view of Figure 2;

Figure 5 is a front elevational view of the magnetic yoke body of Figure 1;

Figure 6 is a side elevational view of Figure 5;

Figure 7 is a schematic structural view of the first gasket of Figure 1;

Figure 8 is a schematic view showing the assembly of the yoke body and the first spacer of Figure 1;

Figure 9 is a schematic structural view of the upper elastic piece of Figure 1;

Figure 10 is a schematic structural view of the wire frame of Figure 1;

Figure 11 is a schematic view showing the assembly of the coil and the wire frame of Figure 1;

Figure 12 is a schematic structural view of the second spacer of Figure 1;

Figure 13 is a schematic structural view of the lower elastic piece of Figure 1;

Figure 14 is a schematic view showing the structure of the base of Figure 1.

In the picture:

1, yoke body; 11, grounding terminal; 12, yoke bottom plate; 13, yoke side frame; 14, yoke through hole; 15, yoke column; 16, yoke groove; 17, yoke convex ;

2, the first gasket; 21, the first support ring; 22, the gasket column; 23, the first gasket convex portion;

3, the upper elastic piece; 31, the first outer frame; 32, the first inner frame; 33, the first fixing hole; 34, the first fixing groove; 35, the first elastic wire; 350, the first straight portion; First curved portion; 352, second arc a portion 353, a third curved portion; 354, a fourth curved portion; 355, a fifth curved portion; 356, a sixth curved portion; 357, a seventh curved portion; 358, an eighth curved portion 359, a second straight portion; 36, a first outer frame groove;

4, the coil;

5, wire frame; 51, wire frame light hole; 52, wire frame top; 53, the top of the wire frame convex; 54, the bottom of the wire frame; 55, the outer wall of the wire frame; 56, the wire frame groove; 57, wire frame Grease ring; 58, wire frame convex teeth; 59, the bottom of the wire frame convex;

6. a permanent magnet; 61, a first magnet; 62, a second magnet; 63, a third magnet; 64, a fourth magnet;

7. The second gasket; 71, the second support ring; 72, the gasket groove;

8. Lower elastic piece; 81, second outer frame; 82, second inner frame; 83, second fixing hole; 84, second fixing groove; 85, second elastic wire; 850, third straight portion; 851, Nine arc-shaped portion; 852, tenth curved portion; 853, first curved portion; 854, twelfth curved portion; 855, fourth straight portion; 856, thirteenth curved portion; 857, Fourteen curved portions; 858, fifteenth curved portion; 859, sixteenth curved portion; 860, fifth straight portion; 88, pole piece;

9, base; 91, base dust ring; 92, base light through hole; 93, base dust ring inner step; 94, base groove; 95, base column; 96, card slot; 97, pole piece through hole .

detailed description

As shown in FIGS. 1 to 14, the multi-purpose micro voice coil motor described in this embodiment includes a yoke body 1, a first spacer 2, an upper elastic piece 3, a coil 4, a wire frame 5, a permanent magnet 6, and a first Two spacers 7, a lower elastic piece 8, and a base 9.

As shown in FIGS. 5 to 6, the yoke body 1 includes a square yoke base plate 12, a yoke side frame 13 is disposed on the yoke base plate 12, and a yoke through hole 14 is disposed in the center of the yoke base plate 12, and the yoke through hole 14 is provided in the yoke through hole 14 Peripheral, yoke side Four yoke columns 15 are annularly disposed on the same side of the frame 13, and four yoke columns 15 are respectively disposed in parallel with the four corners of the yoke side frame 13, and the yoke bottom plate 14 is adjacent to the yoke side frame on the periphery of the yoke bottom plate 14. A yoke groove 16 is provided on one side of the 13.

In the present embodiment, the yoke body 1 is made of a metal having high magnetic permeability and excellent ductility, and is preferably made of copper.

As shown in FIG. 7, a first spacer 2 is assembled in the yoke body 1, and the first spacer 2 includes a first support ring 21 that cooperates with the yoke bottom plate 12, and the upper four corners of the first support ring 21 correspond to the yoke side. A spacer post 22 is provided at four corners of the frame 13, and a first pad convex portion 23 is provided on a side of the first support ring 21 near the center.

In this embodiment, the first gasket 2 is directly injection molded from plastic.

As shown in FIG. 9 , the upper elastic piece 3 includes a first outer frame 31 , a first inner frame 32 , and a first elastic wire 35 . The first outer frame 31 has a first outer frame groove 36 corresponding to the first pad convex portion 23 . The first inner frame 32 is provided with a first fixing hole 33 of the fixing wire frame 5, and the first fixing hole 33 is annularly uniformly arranged with four first fixing grooves 34, and the yoke column 15 passes through the first outer frame 31 and the first a gap between the inner frames 32, and the upper elastic piece 3 is fixed in the yoke body 1. The first elastic wire 35 includes an eight-section curved curved portion and two straight portions, respectively being the first curved portion 351, a second curved portion 352, a third curved portion 353, a fourth curved portion 354, a fifth curved portion 355, a sixth curved portion 356, a seventh curved portion 357, an eighth curved portion 358, a first The straight portion 350 and the second straight portion 359, and the first curved portion 351, the second curved portion 352, the third curved portion 353, and the fourth curved portion 354 are sequentially coupled by the arc tangent The S-shaped elastic portion, the fifth curved portion 355, the sixth curved portion 356, the seventh curved portion 357 and the eighth curved portion 358 are sequentially coupled by a curved tangent to form a second S-shaped elastic portion. First inner frame 32, first The straight portion 350, the first S-shaped elastic portion, the second S-shaped elastic portion, the second straight portion 359, and the first outer frame 31 are sequentially connected, and the first inner frame 32 and the first straight portion 350 are first. The outer frame 31 and the second straight portion 359 are each connected by an arc-shaped transition, and the first straight portion 350 and the first S-shaped elastic portion, the second straight portion 359 and the second S-shaped elastic portion are aligned with each other. Curved tangent Coupling, the first s-shaped elastic portion and the second S-shaped elastic portion are tangentially coupled by an arc and an arc. The first outer frame 31 of the upper elastic piece 3 is disposed between the first support ring 21 and the yoke upright 15, and the yoke upright 15 is inserted into the space between the first outer frame 31 and the first inner frame 32.

As shown in Figures 10 and 11, the bobbin 5 includes a bobbin top 52 and a bobbin bottom 54 that is secured by a first inner frame 32 of the upper shrapnel 3, and the bobbin top 52 is disposed with the upper shrapnel 3 The first fixing groove 34 is matched with the wire frame top convex portion 53, the wire frame top portion 52 and the wire frame bottom portion 54 are provided with a wire frame light-passing hole 51, and the wire frame top 52 and the wire frame bottom portion 53 are opposite to the wire frame. The optical hole 51 is provided with a wire frame outer wall 55. The wire frame outer wall 55 is provided with a wire frame groove 56 matched with the yoke column 15, and a wire frame dustproof ring 57 is disposed on the wire frame bottom portion 54 and the wire frame light passing hole 51. A wire frame convex tooth 58 is disposed on a side of the wire frame dustproof ring 57 near the outer wall 55 of the wire frame, and two wire frame bottom convex portions 59 are symmetrically disposed near the outer wall 55 of the wire frame, and a coil is disposed on the outer wall 55 of the wire frame 4, the coil 4 釆 uses a square frame structure.

In the present embodiment, the wire frame 5 is integrally molded by a synthetic resin material, so that the wire frame 5 has the characteristics of precise size, small thermal expansion coefficient, electrical insulation, no dust generation, and rapid mass production.

As shown in FIG. 8, a permanent magnet 6 (a permanent magnet 6 is not shown in the figure) is mounted between each two spacer posts 22 against the yoke side frame 13, and the permanent magnet 6 includes a first magnet 61, a second The magnet 62, the third magnet 63, and the fourth magnet 64, the first magnet 61, the second magnet 62, the third magnet 63, and the fourth magnet 64 are all thin strip magnets, the magnetic face of the permanent magnet 6 and the side of the coil 4 parallel.

The permanent magnet 6 faces the coil 4 as an N pole or an S pole, and the permanent magnet 6 abuts against the side surface of the inner surface of the yoke body 1 to correspond to the S pole or the N pole, and the magnetic field direction of the entire permanent magnet and the side winding direction of the coil 4 facing the same Vertically, the four permanent magnets 6 respectively correspond to the four sides of the coil 4, so that the matching area between the side of the permanent magnet and the side of the coil is larger, so as to increase the electromagnetic force of the coil, that is, increase the driving force of the motor.

As shown in FIG. 13, the lower elastic piece 8 includes a second outer frame 81, a second inner frame 82, and a second elastic wire 85, The second outer frame 81 is arranged along the center of the lower elastic piece 8, and the second inner frame 82 is also arranged along the center of the lower elastic piece 8. Here, the second outer frame 81 and the second inner frame 82 are separated by their center. In the two-part non-enclosed structure, the insulation function can be realized, and the insulation function is not required to be separately provided, which simplifies the process and saves parts, and further reduces the cost.

The second inner frame 82 has a second fixing hole 83 for fixing the bottom portion 54 of the wire frame. The second inner frame 82 has a second fixing groove 84 corresponding to the side of the second outer frame 81. The second elastic wire 85 includes a curved portion of six segments and a straight portion of three segments, which are respectively a ninth curved portion 851 and a tenth curved portion.

852, the first curved portion 853, the twelfth curved portion 854, the thirteenth curved portion 856, the fourteenth curved portion 857, the fifteenth curved portion 858, the sixteenth curved portion 859, a third straight portion 850, a fourth straight portion 855, and a fifth straight portion 860, and a ninth curved portion 851, a tenth curved portion 852, and a second curved portion

853, the twelfth curved portion 854 is sequentially coupled by arc tangent to form a third S-shaped elastic portion, a thirteenth curved portion 856, a fourteenth curved portion 857, a fifteenth curved portion 858, The sixteenth curved portion 859 is coupled into the fourth S-shaped elastic portion by the arc tangent, the second inner frame 82, the third straight portion 850, the third S-shaped elastic portion, and the fourth straight portion 855. The fourth S-shaped wire portion, the fifth straight portion 860, and the second outer frame 81 are sequentially connected, and the second inner frame 82 and the third straight portion 850, the second outer frame 81, and the fifth straight portion 860 are each arced. Transition connection, third straight portion 850 and third S-type elastic portion, fourth straight portion 855 and third S-type elastic portion and fourth S-type elastic portion, fourth S-type elastic portion and fifth The straight portions 860 are tangentially coupled by a straight line and an arc.

The pole piece 88 is integrally bent and formed on the second outer frame 81, and the pole piece 88 is integrally formed on the second outer frame 81, thereby reducing the process of welding the pole piece 88 on the second outer frame 81, overcoming the conventional Positive and negative electrode sheets and shrapnel welding process requirements are high, it is difficult to ensure the yield rate problem, and also saves the use of components, saving cost, and the second inner frame 82 where the two pole pieces 88 are located respectively and the coil 4 The start line and end line are soldered on. As shown in Figures 9 and 13, the present invention changes the structure of the first elastic wire 35 and the second elastic wire 85 such that it includes at least two S-shaped elastic portions arranged in a non-linear arrangement, and the shrapnel is added. The structural stability makes the average value of the angle between the dynamic and static axes of the rotor frame of the motor rotor during the movement can be controlled within 0.12 °, which is much smaller than that of the conventional motor rotor frame during the movement. The average value of the angle between the axis of the wire frame and the static state is above 0.2 Γ, which plays a decisive role in ensuring the focusing effect. It will be understood by those skilled in the art that any of the elastic filament structures having at least eight arcuate portions that can constitute at least two S-shaped filament portions arranged in a non-linear manner can be applied to the present invention.

In this embodiment, the upper elastic piece 3 and the lower elastic piece 8 are made of other metal composite plates such as nickel or copper.

The first end of the first elastic wire 35 and the second elastic wire 85 have the same thickness from the beginning to the end, and the width from the beginning to the end is set by a narrow and wide uniform gradient. Through the above design, the purpose of eliminating stress concentration during the movement of the wire frame 5 can be achieved.

As shown in FIG. 12, the second spacer 7 is disposed between the permanent magnet 6 and the second outer frame 81 of the lower elastic piece 8 for pressing the second outer frame 81 of the lower elastic piece 8 against the base 9, second The spacer 7 includes a second support ring 71 that cooperates with the shape of the second outer frame 81. The four corners of the second support ring 71 are recessed inwardly with a spacer groove 72.

As shown in FIG. 14 , a base light-passing hole 92 is disposed in the center of the base 9 , and a base dust-proof ring 91 is disposed on the outer periphery of the base light-passing hole 92 , and a dust-proof ring 91 is disposed between the base dust-proof ring 91 and the base light-passing hole 92 . The inner dust-proof ring inner step 93 for supporting the wire frame dust-proof ring 57, the side of the base dust-proof ring 91 and away from the center of the base light-passing hole 92 are respectively provided with the wire frame convex teeth 58 and the wire frame bottom convex portion 59. The matching base recess 94 is provided with a base post 95 matching the wire frame recess 56 at the four corners of the base, and the shape of the base post 95 is also matched with the shape of the spacer groove 72 to facilitate the base post 95. Through the wire frame groove When the 56 is inserted into the yoke upright 15 of the yoke body, the second spacer 7 can be fixed by the way.

Four yoke convex portions 17 are uniformly distributed on each of the frames of the yoke side frame 13, and one yoke convex portion 17 is provided with a ground terminal 11 for ensuring stabilization of the electromagnetic field inside the yoke body 1, corresponding to the yoke convex The portion 17 is provided with a latching slot 96 on the side of the base 9 so that the yoke body 1 and the base 9 can be snap-fitted together, and the pole piece 88 is provided on both sides of one of the latching slots 96 for the passage of the pole piece 88. The pole piece through hole 97.

In this embodiment, the first elastic wire 35 and the second elastic wire 85 have four groups, and the four first elastic wires 35 are symmetrically distributed between the first outer frame 31 and the first inner frame 32, and the four groups are The two elastic wires 85 are symmetrically distributed between the second outer frame 81 and the second inner frame 82. Through the above design, four sets of elastic wires are arranged symmetrically and evenly, so that each set of elastic wires will generate a centripetal tension of the same size during the movement of the wire frame 5, thereby ensuring the dynamics of the rotor wireframe axis during the movement of the rotor. The angle formed with the static is the smallest, thus ensuring the focus effect.

In addition to the shape of the coil described in the above embodiments, the coil may be cylindrical or irregular, or the coil may be wound on the wire frame on the outer wall of the wire frame and form an integral structure with the wire frame.

In addition to the thicknesses from the beginning end to the end of the first elastic wire and the second elastic wire described in the above embodiments, the width from the beginning to the end is set by the narrowing and widening uniform gradient, and may be set to be narrower and wider. Gradient setting; or the width from the beginning to the end of the first elastic wire and the second elastic wire are the same, and the thickness from the beginning to the end is thinned from thick or from a thin gradient to a uniform gradient.

The assembly method of the multi-purpose micro voice coil motor includes the following steps:

First: applying a synthetic resin adhesive to the side of the yoke body 1 in contact with the first spacer 2, and then mounting the first spacer 2 to the yoke base 12 of the yoke body 1, and The spacer post 22 of the first spacer 2 is aligned with the four corners of the yoke side frame 13;

Second 歩: The upper elastic piece 3 is loaded into the yoke body 1 to mount the first outer frame 31 on the first support ring 21 and the yoke column 15, and the first inner frame 32 is mounted in the yoke column 15, and the first shims convex portion 23 is aligned with the first outer frame groove 36;

Third 歩: an adhesive is applied in the yoke side frame 13, and the first magnet 61, the second magnet 62, the third magnet 63, and the fourth are pasted between the spacer posts and the yoke side frame 13 Magnet 64;

Fourth: continue to apply the adhesive in the yoke side frame 13, and then assemble the second spacer 7, so that the four spacer grooves 72 of the second spacer 7 are respectively in contact with the permanent magnet 6;

Fifth 歩: The coil 4 is then mounted to the outer wall 55 of the bobbin 5, and the lower elastic piece 8 is assembled with the bobbin bottom 54 of the bobbin 5;

The sixth winding: the coil 4, the wire frame 5, and the lower elastic piece 8 which are assembled into one body are placed in the yoke body 1, and the second outer frame 81 of the lower elastic piece 8 is placed in the second spacer 7 On the second support ring 71, the top frame 52 of the wire frame cooperates with the first inner frame 32 of the upper elastic piece 3, that is, the wire frame top convex portion 53 is engaged with the first fixing groove 34 of the upper elastic piece 3;

The seventh step: the convex portion adhesive at the inner corners of the yoke body 1, and then the base 9 is snapped onto the yoke body 1, the base dust ring 91 is matched with the wire frame dust ring 57, and the wire frame is prevented. The end of the dust ring 57 is in contact with the step 93 of the base dust ring, and the base column 95 is bonded to the gasket column 22 of the first gasket 2 through the gasket groove 72 at the four corners of the second gasket 7. At this time, the pole piece 88 protrudes outside the motor through the pole piece through hole 97, the ground terminal 11 protrudes outside the motor through the card slot, and the card slot 96 and the yoke convex part 17 on the yoke body 1 are stuck. Then, the yoke body 1 and the base 9 are snap-fitted together to complete the assembly of the entire motor.

The yoke body 1 is coated with an adhesive before each part is placed, which enhances the shock and vibration resistance of the motor.

By using the grounding terminal 11, the grounding terminal 11 can be grounded when the motor is in operation, and when there is an external electric field interference, a loop is formed in the entire yoke body 1 to effectively protect the internal electromagnetic field from being stable. On the second outer frame 81 of the lower elastic piece 8, a pole piece 88 is disposed, and the entire motor input current is the lower elastic piece piece 88. The current is input from the pole piece 88, and a ring current is formed in the entire coil 4 due to the magnetic field of the permanent magnet 6. The direction is perpendicular to the side winding direction of the coil 4 facing, that is, the direction of the magnetic field is perpendicular to the current direction. Thus, according to Ampere's law, the coil is subjected to an electromagnetic force perpendicular to the direction of the current and the direction of the magnetic field, which determines the motor. The driving force.

The technical principles of the present invention have been described above in connection with specific embodiments. The descriptions are only intended to explain the principles of the invention and are not to be construed as limiting the scope of the invention. Based on the explanation herein, those skilled in the art will be able to contemplate other specific embodiments of the present invention without departing from the scope of the invention.

Claims

claims

1. A multi-purpose micro voice coil motor, including a yoke body, a first gasket, an upper elastic piece, a coil, a wire frame, a permanent magnet, a second gasket, a lower elastic piece and a base, characterized in that the magnetic yoke The body and the base are arranged in cooperation with each other to form a closed space for accommodating the first gasket, the upper elastic piece, the coil, the wire frame, the permanent magnet, the second gasket, and the lower elastic piece. The yoke body is used The metal material is stamped and formed in one piece.

2. A multi-purpose micro voice coil motor according to claim 1, characterized in that the yoke body includes a rectangular or square yoke bottom plate, and a yoke side frame is provided on the yoke bottom plate, A yoke through hole is provided in the center of the yoke bottom plate. A plurality of yoke uprights are arranged annularly around the yoke through hole and on the same side as the yoke side frame. The yoke uprights are parallel to the yoke side frame. Provided, a yoke groove is provided on the yoke bottom plate and on one side of the yoke through hole close to the yoke side frame;

The first gasket is provided in the body of the yoke. The first gasket includes a first support ring that matches the bottom plate of the yoke. The four upper corners of the first support ring are provided with pads corresponding to the four corners of the yoke side frame. A first gasket protrusion is provided on a side of the first support ring close to the center.

3. A multi-purpose micro voice coil motor according to claim 2, characterized in that the upper elastic piece is provided in the first support ring of the first gasket, and the upper elastic piece includes a first outer frame, The first inner frame and the first elastic wire, the first outer frame is provided with a first outer frame groove corresponding to the first gasket convex portion, and the first inner frame is provided with a first fixing wire frame. A fixing hole, a plurality of first fixing grooves are annularly provided in the first fixing hole, the yoke column passes through the gap between the first outer frame and the first inner frame, and fixes the upper elastic piece on the In the body of the magnetic yoke, the first elastic wire includes at least six curved arc-shaped parts and two straight-line parts, and the straight-line part and the arc-shaped part are tangentially coupled by straight lines and arcs, and the third elastic wire includes at least six curved arc-shaped parts and two straight-line parts. An elastic wire is connected to the first outer frame and the first inner frame in an arc-shaped transition respectively.

4. A multi-purpose micro voice coil motor according to claim 3, characterized in that the wire frame includes a wire frame top and a wire frame bottom, and the top of the wire frame is fixed by the first inner frame of the upper elastic piece. fixed, and the top of the wire frame is provided with a convex portion on the top of the wire frame that matches the first fixing groove of the upper elastic piece, a wire frame light hole is provided between the top of the wire frame and the bottom of the wire frame, the wire frame Between the top and the bottom of the wire frame, an outer wall of the wire frame is provided facing away from the light hole of the wire frame. The outer wall of the wire frame is provided with a wire frame groove that matches the yoke upright. On the bottom of the wire frame, the wire A wire frame dust ring is arranged around the light hole of the frame. The wire frame dust ring is provided with wire frame protrusions on one side close to the outer wall of the wire frame. Two wires are symmetrically arranged at the bottom of the wire frame near the outer wall of the wire frame. There is a convex part at the bottom of the frame, and the coil is arranged on the outer wall of the wire frame.

5. A multi-purpose micro voice coil motor according to claim 2, characterized in that the permanent magnet is arranged between each two gasket uprights and close to the yoke side frame, and the permanent magnet is The magnets include a first magnet, a second magnet, a third magnet and a fourth magnet. The first magnet, the second magnet, the third magnet and the fourth magnet are all thin strip magnets. The magnetic surface of the permanent magnet is The coil surfaces are parallel.

6. A multi-purpose micro voice coil motor according to claim 4, characterized in that the lower elastic piece includes a second outer frame, a second inner frame and a second elastic wire, and the second outer frame is along the lower The center of the elastic piece is divided, and the second inner frame is also divided along the center of the lower elastic piece. The second inner frame has a second fixing hole for fixing the bottom of the wire frame. The periphery of the second inner frame A second fixing groove is provided on the side close to the second outer frame corresponding to the convex portion of the bottom of the wire frame. The second elastic wire includes at least six curved arc portions and two straight portions, and the straight portion and The arc-shaped portion is tangentially coupled with a straight line and an arc, the second elastic wire is connected to the second outer frame and the second inner frame in an arc-shaped transition respectively, and is provided on the second outer frame. Two pole pieces are used for connecting electricity. The second inner frame where the two pole pieces are located is welded to the start line and the end line of the coil respectively.

7. A multi-purpose micro voice coil motor according to claim 6, characterized in that the second gasket is disposed between the permanent magnet and the second outer frame of the lower elastic piece for connecting the The second outer frame of the lower elastic piece is pressed tightly against the base. The second gasket includes a second support ring that matches the shape of the second outer frame. The four corners of the second support ring are inward. The recess has gasket grooves.

8. A multi-purpose micro voice coil motor according to claim 7, characterized in that a base light hole is provided in the center of the base, and a base anti-dust ring is provided on the periphery of the base light hole corresponding to the wire frame dust ring. Dust ring, an inner step of the base dust ring for supporting the wire frame dust ring is provided between the base dust ring and the base light hole, on the base dust ring and away from the base through hole One side of the center of the light hole is provided with base grooves that match the convex teeth of the wire frame and the convex portion of the bottom of the wire frame respectively, and base posts that match the gasket grooves of the second gasket are provided at the four corners of the base.

9. A multi-purpose micro voice coil motor according to any one of claims 1 or 2 or 3 or 5 or 7 or 8, characterized in that four are evenly distributed on each frame of the yoke side frame. One of the yoke convex parts is provided with a grounding terminal for ensuring the stability of the electromagnetic field inside the yoke body, and a locking groove is provided on the side of the base corresponding to the yoke convex part, so that The yoke body and the base can be snapped together as one body, and pole piece through holes for the pole pieces to pass through are provided on both sides of one of the locking slots corresponding to the pole pieces.

10. A multi-purpose micro voice coil motor according to claim 3 or 6, characterized in that there are four groups of the first elastic wire and the second elastic wire, and the four groups of the first elastic wire The four groups of second elastic threads are symmetrically and evenly distributed between the first outer frame and the first inner frame, and the four groups of second elastic threads are symmetrically and evenly distributed between the second outer frame and the second inner frame.