CN220043203U - Lens driving module and voice coil motor thereof - Google Patents

Abstract

The utility model discloses a voice coil motor, which is used for driving a lens to focus, and comprises a stator, a rotor, a first coil and a first magnet, wherein the stator is used for being connected to electronic equipment; the rotor is movably connected to the stator and is used for installing a lens and driving the lens to move along the optical axis direction; one of the first coil and the first magnet is connected with the stator, the other one of the first coil and the first magnet is connected with the rotor, the polarity of the first magnet is distributed along the optical axis direction and is opposite to the first coil along the first direction, a first groove is formed in the side surface of the first magnet opposite to the first coil, and the first direction is perpendicular to the optical axis direction. According to the utility model, the first groove is formed in the first magnet, so that the weight of the voice coil motor is reduced and the driving force of the voice coil motor is increased under the condition that the volume of the first magnet is not changed, and the focusing speed can be improved.

Description

Lens driving module and voice coil motor thereof

Technical Field

The present utility model relates to the field of optical lens driving technology, and in particular, to a lens driving module and a voice coil motor thereof.

Background

With the continuous development and wide application of terminal devices, the automatic focusing function is increasingly applied to terminal devices such as smart phones and tablet computers. The terminal equipment with the automatic focusing function can automatically focus the shot object during shooting, so that clear imaging of the shot object is realized.

The auto-focusing function of the lens driving module is generally realized by a voice coil motor. The voice coil motor comprises a rotor part and a stator part, wherein the rotor part is fixedly provided with a lens, and the rotor part can move relative to the stator part in the optical axis direction. The lens may move with the mover portion, and an imaging focus of the lens on the object may be positioned on the image sensor.

Generally, the mover portion moves relative to the stator portion in the following manner: one of the stator part or the mover part is provided with a magnet, and the other is provided with a coil. After the coil is electrified, the magnetic field of the magnet can enable the moving charges in the coil to generate Lorentz force, and the Lorentz force is thrust of the rotor to push the lens.

The magnitude of the lorentz force can influence the thrust of the voice coil motor, so that the automatic focusing speed of the terminal equipment is influenced, and therefore, the improvement of the lorentz force between the magnet and the coil is important.

Disclosure of Invention

The utility model aims to provide a lens driving module and a voice coil motor thereof, wherein the voice coil motor has larger pushing force and can improve the focusing speed of a driving lens.

To solve the above technical problem, embodiments of the present utility model provide a voice coil motor for driving a lens to focus, including:

a stator for connection to an electronic device;

the rotor is movably connected to the stator and is used for installing a lens; and

the lens comprises a first coil and a first magnet, wherein one of the first coil and the first magnet is connected with the stator, the other one of the first coil and the first magnet is connected with the rotor, the polarity of the first magnet is distributed along the optical axis direction of the lens and is opposite to the first coil along a first direction, a first groove is formed in the side surface, opposite to the first coil, of the first magnet, and the first direction is perpendicular to the optical axis direction.

In one embodiment, the first coil is connected to the mover, and the first magnet is connected to the stator.

In one embodiment, a second groove is formed in the side surface, away from the first coil, of the first magnet, and the second groove is aligned with the first groove along the first direction.

In one embodiment, a plurality of the first grooves are arranged at intervals along the optical axis direction, and a plurality of the second grooves are aligned with a plurality of the first grooves, respectively, along the first direction.

In one embodiment, a plurality of the first magnets are stacked along the optical axis direction and two adjacent first magnets attract each other.

The utility model also relates to a lens driving module, comprising:

the base body is provided with a second coil;

in the voice coil motor, the stator can be movably connected to the base; and

the polarities of the second magnets are distributed along the first direction and connected with the stator, the second magnets and the second coil are aligned along the optical axis direction, and the side surfaces of the second magnets, which are opposite to the second coil, are provided with first concave parts.

In one embodiment, a second concave portion is disposed on a side surface of the second magnet facing away from the second coil, and the second concave portion is aligned with the concave portion along the optical axis direction.

In one embodiment, the plurality of first recesses are spaced apart along the first direction.

In one embodiment, the plurality of second concave portions and the plurality of first concave portions are aligned in the optical axis direction, respectively.

In one embodiment, the second recess is the same shape as the first recess.

According to the utility model, the first groove is formed in the first magnet, so that the weight of the voice coil motor is reduced, the driving force of the voice coil motor is increased, and the focusing speed is improved under the condition that the volume of the first magnet is not changed.

Drawings

Fig. 1 is an exploded view of a voice coil motor according to an embodiment of the present utility model.

Fig. 2 is a perspective view of a first magnet and a first coil in the prior art.

Fig. 3 and 4 are perspective views of a first magnet and a first coil according to an embodiment of the present utility model.

Fig. 5 is an exploded view of a lens driving module according to an embodiment of the present utility model.

Fig. 6 and 7 are assembled views of the voice coil motor, the base, the upper reed, the lower reed, and the four suspension wires in the embodiment shown in fig. 5.

Fig. 8 is an assembly view of the mover and the first and second magnets in the embodiment shown in fig. 5.

Reference numerals: 100. a voice coil motor; 1. a stator; 11. a first magnet; 111. a first groove; 112. a second groove; 12. a second magnet; 2. a mover; 21. a first coil; 101. a first partial magnetic field line; 102. a second partial magnetic field line; 103. a third portion of magnetic field lines; 3. a base; 31. a bottom plate; 32. a circuit board; 4. an upper reed; 5. a lower reed; 7. a suspension wire; 8. a housing; 200. and a lens driving module.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present utility model. However, the technical solutions claimed in the claims of the present utility model can be realized without these technical details and various changes and modifications based on the following embodiments.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising" will be understood to be open-ended, meaning of inclusion, i.e. to be interpreted to mean "including, but not limited to.

The following detailed description of various embodiments of the present utility model will be provided in connection with the accompanying drawings to provide a clearer understanding of the objects, features and advantages of the present utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the utility model, but rather are merely illustrative of the true spirit of the utility model.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present utility model, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.

The present utility model relates to a lens driving module 200 and a voice coil motor 100 of the lens driving module 200, wherein the voice coil motor 100 can rapidly drive a lens to move along an optical axis direction, and the lens driving module 200 and the voice coil motor 100 thereof according to an embodiment of the present utility model are described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the voice coil motor 100 includes a stator 1 and a rotor 2, wherein the stator 1 is provided with a first magnet 11, and can be used for connecting with electronic equipment, and the electronic equipment includes terminal equipment such as a smart phone, a tablet computer, and the like. The rotor 2 and the stator 1 are movably connected and provided with a first coil 21, the first coil 21 and the first magnet 11 are aligned along a first direction X, and the first direction X is perpendicular to the optical axis direction Z of the lens. The stator 1 is used for mounting a lens. After the first coil 21 is electrified, the first coil 21 and the first magnet 11 are matched to drive the stator 1 to move along the optical axis direction, so that the focal length of the lens is adjusted. It should be understood that in other embodiments, the first magnet 11 may be disposed on the mover 2, the first coil 21 may be disposed on the stator 1, or the mover 2 and the stator 1 may be driven to move relatively, and the specific installation manner of the first coil 21 and the first magnet 11 is not limited.

In the embodiment shown in fig. 1, the stator 1 and the mover 2 are both rectangular annular extending around the optical axis direction, the stator 1 is located in the ring of the mover 2, the optical axis direction Z of the lens is the axial direction, and the first direction X is one direction in the radial direction. It should be understood that in other embodiments, the stator 1 and the mover 2 may be provided in other shapes as long as the lens can be driven to move in the optical axis direction, and the specific shapes of the stator 1 and the mover 2 are not limited.

In the embodiment shown in fig. 1, the first magnets 11 are attached to one side portion of the stator 1 and extend in the second direction Y, and the second direction Y, the first direction X, and the optical axis direction Z are perpendicular to each other. In the embodiment shown in fig. 1, the first direction X and the second direction Y are both two directions of the horizontal direction, and the optical axis direction Z is the vertical direction.

The polarity distribution direction of the first magnet 11 is along the optical axis direction Z, that is, the N pole and the S pole of the first magnet 11 are distributed along the optical axis direction Z, and two first grooves 111 are formed on the side surface of the first magnet 11, which is close to the first coil 21, the two first grooves 111 are formed by recessing the side surface of the first magnet 11 along the first direction X, extend along the second direction Y and penetrate the first magnet 11, and the two first grooves 111 are uniformly arranged at intervals along the optical axis direction Z.

In the prior art, as shown in fig. 2, the N pole of the first magnet 11 is located at the top in the optical axis direction, the S pole is located at the bottom, that is, the magnetization regions of the first magnet 11 are located at the top and bottom, and the first coil 21 is located near the middle portion of the first magnet 11 in the optical axis direction. The magnetic field lines of the first magnet 11 pass through the first coil 21 from the N pole to the S pole, and the magnetic field lines pass through the first coil 21 perpendicularly.

In the present utility model, as shown in fig. 3, the first coil 21 is also near the middle portion of the first magnet 11, and the polarity distribution of the first magnet 11 is also distributed along the optical axis direction Z, that is, the partial magnetization regions are located at the top and bottom of the first magnet 11, that is, the partial magnetic field lines extend from the top to the bottom of the first magnet 11 and pass through the first coil 21. In addition, the first magnet 11 is provided with a first groove 111 on the side surface along the second direction Y, and the first groove 111 makes a part of magnetization area distributed near the first groove 111, and another part of magnetic field lines extend into the first groove 111 from the top and the bottom of the first magnet 11 and pass through the first coil 21, so that it can be seen that the number of magnetic field lines of the first magnet 11 vertically passing through the first coil 21 as a whole increases, that is, on the basis of not changing the volume of the first magnet 11, the magnetic flux of the first magnet 11 passing through the first coil 21 increases, so that the driving force of the voice coil motor 100 is improved, and the lens can be quickly driven to focus. In addition, after the first recess 111 is formed in the first magnet 11, the overall weight of the first magnet 11 is reduced, so that the overall weight of the voice coil motor 100 can be reduced, and the voice coil motor 100 can be further reduced in weight.

It should be understood that the first magnet 11 may also extend along the first direction X and be aligned with the first coil 21 along the second direction Y, and the first recess 111 is located on a side surface of the first magnet 11 along the second direction Y and close to the first coil 21, so long as the first recess 111 is open toward the first coil 21.

In addition, in the embodiment shown in fig. 1, the side surface of the first magnet 11 adjacent to the first coil 21 is provided with two first grooves 111, and the two first grooves 111 are uniform in shape and are arranged at intervals in the optical axis direction Z. In this case, the magnetic field lines may extend from the top and bottom of the first magnet 11 to the two first grooves 111, respectively, and vertically pass through the first coil 21, and there may be magnetic field lines passing through the first coil 21 between the two first grooves 111, so that the magnetic flux of the first magnetic passing through the first coil 21 may be further increased. It should be understood that in other embodiments, a plurality of first grooves 111 may be provided on the side of the first magnet 11 near the first coil 21 as needed, and the depth or shape of the first grooves 111 may be adjusted as needed, without limiting the number and shape of the first grooves 111.

Preferably, the side of the first magnet 11 facing away from the first coil 21 is provided with the second grooves 112, and the number of the second grooves 112 may be single or plural. The number of the second grooves 112 is preferably the same as that of the first grooves 111, and more preferably, the second grooves 112 and the first grooves 111 are identical in shape and aligned along the first direction, so that the first magnets 11 are symmetrically distributed along the magnetic field lines on both sides of the first direction X, and the stability of the magnetic field or the overall shape of the first magnets 11 can be increased. It should be understood that the shape of the second groove 112 and the shape of the first groove 111 may be different, for example, the first groove 111 is a rectangular groove, and the second groove 112 may be provided as a cylindrical groove. The number of the second grooves 112 may be different from the number of the first grooves 111, and the number of the first grooves 111 may be set to two or three, and the number of the second grooves 112 may be set to two or one, as long as the shape and the magnetic field lines of the first magnet 11 can be stabilized.

In the embodiment shown in fig. 4, two first magnets 11 are stacked in the optical axis direction Z, and the polarities of the two first magnets 11 are distributed in the optical axis direction Z, and the two first magnets 11 are disposed so as to attract each other. Each first magnet 11 is provided with a first groove 111 on one side surface along the first direction X, and a second groove 112 on the other side surface. The magnetic field lines of the two first magnets 11 near the first coil 21 are divided into three parts, wherein the first part of the magnetic field lines 101 are from the top of the first magnet 11 at the top to the bottom of the first magnet 11 at the bottom, and the second part of the magnetic field lines 102 are from the N pole or S pole of the two first magnets 11 to the respective first grooves 111. The third partial magnetic field lines 103 extend from the top of the top first magnet 11 to the bottom thereof, or from the bottom of the bottom first magnet 11 to the top thereof. The three magnetic field lines pass through the first coil 21, respectively, greatly increasing the magnetic flux passing through the first coil 21. The two first magnets 11 are symmetrically arranged along the magnetic field lines on both sides of the first direction X, so that the whole magnet magnetic field and shape are very stable.

It should be understood that a plurality of first magnets 11 stacked along the optical axis direction Z may be provided as required, and the polarities of the plurality of first magnets 11 only need to be distributed along the optical axis direction Z and two adjacent first magnets 11 are arranged in a sucking manner, without limiting the number of first magnets 11.

The lens driving module 200 of the present utility model includes a base 3, a second magnet 12, an upper reed 4, a lower reed 5, four suspension wires 7, a housing 8, and the voice coil motor 100. As shown in fig. 5-8, the base 3 includes a bottom plate 31 and a circuit board 32, and a second coil is disposed in the circuit board 32. The voice coil motor 100 is suspended above the base 3, the stator 1 is further provided with a second magnet 12, the second magnet 12 is aligned with the second coil along the optical axis direction Z, and the second coil can be matched with the second magnet 12 after being electrified to drive the stator 1 to move along the first direction X or the second direction Y, so as to play a role in preventing lens shake.

In addition, the second magnets 12 extend along the first direction X and the polarity distribution is also along the first direction X, that is, the N pole and the S pole of the second magnets 12 are located at the two ends of the second magnets 12 along the first direction X, respectively. The second magnet 12 is further provided with a first recess near the bottom surface of the second coil, and the first recess extends along the first direction X and penetrates through the second magnet 12. The first recess may also increase the magnetic flux between the second magnet 12 and the second coil to increase the thrust force driving the movement of the stator 1. In addition, the second concave portion of the second magnet 12 can further reduce the weight of the lens driving module 200, so that the lens driving module 200 is lighter.

It is to be understood that the side surface of the second magnet 12 adjacent to the second coil may be provided with a plurality of first concave portions arranged at intervals along the first direction X, for example, two or three first concave portions may be provided, and the number and the specific shape of the first concave portions are not limited.

Preferably, a second concave portion is disposed on a surface of the second magnet 12 facing away from the second coil, and the shape of the second concave portion may be the same as or different from that of the first concave portion. The second concave part and the first concave part are aligned along the optical axis direction Z and can be arranged in a dislocation way. The number of second concave portions may be different from or the same as the number of first concave portions. Preferably, the second concave portions have the same shape as the first concave portions, and the second concave portions are preferably aligned in the optical axis direction Z in the same number as the first concave portions, so that the stability of the second magnet 12 can be increased.

The upper reed 4 and the lower reed 5 have elasticity, respectively, the upper reed 4 is located at the top of the voice coil motor 100, the lower reed 5 is located at the bottom of the voice coil motor 100, and the upper reed 4 and the lower reed 5 are connected with the top and the bottom of the voice coil motor 100, respectively, and allow the stator 1 and the mover 2 to be elastically connected. After the rotor 2 moves relative to the stator 1, the upper reed 4 and the lower reed 5 cooperate to drive the stator 1 to reset.

The top and the upper reed 4 of four suspension wires 7 are connected, and the bottom extends beyond the bottom of voice coil motor 100 and is connected with pedestal 3 along the optical axis direction, and four suspension wires 7 make voice coil motor 100 unsettled in the top of pedestal 3, prevent the touch pedestal 3 of voice coil motor 100 motion in-process.

The housing 8 covers the voice coil motor 100 and is connected with the base 3, and a light shielding hole is further formed at the top of the housing 8 for shielding the light entering the lens.

According to the utility model, the first groove 111 is formed in the first magnet 11, so that the weight of the voice coil motor 100 is reduced and the driving force of the voice coil motor 100 is increased under the condition that the volume of the first magnet 11 is not changed, and the focusing speed is improved.

While the preferred embodiments of the present utility model have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims (10)

1. A voice coil motor for driving a lens into focus, comprising:

a stator for connection to an electronic device;

the rotor is movably connected to the stator and is used for installing a lens; and

the lens comprises a first coil and first magnets, wherein one of the first coil and the first magnets is connected with a stator, the other one of the first coil and the first magnets is connected with a rotor, the polarity of the first magnets is distributed along the optical axis direction of the lens, the first magnets and the first coil are oppositely arranged along a first direction, a first groove is formed in the side surface of the first magnets opposite to the first coil, and the first direction is perpendicular to the optical axis direction.

2. The voice coil motor of claim 1, wherein the first coil is connected to the mover, and the first magnet is connected to the stator.

3. The voice coil motor of claim 2, wherein a side of the first magnet facing away from the first coil is provided with a second groove, the second groove aligned with the first groove along the first direction.

4. The voice coil motor of claim 3, wherein a plurality of the first grooves are arranged at intervals in the optical axis direction, and a plurality of the second grooves are aligned with a plurality of the first grooves, respectively, in the first direction.

5. A voice coil motor according to claim 3, wherein a plurality of the first magnets are stacked in the optical axis direction and adjacent two of the first magnets attract each other.

6. A lens driving module, comprising:

the base body is provided with a second coil;

a voice coil motor as claimed in any one of claims 2 to 5, the stator being movably connected to the housing; and

the second magnets are distributed along the first direction, the second magnets are connected with the stator, the second magnets and the second coils are aligned along the optical axis direction, and first concave parts are arranged on the side surfaces of the second magnets, opposite to the second coils.

7. The lens driving module as claimed in claim 6, wherein a side of the second magnet facing away from the second coil is provided with a second recess, and the second recess is aligned with the recess along the optical axis direction.

8. The lens driving module as claimed in claim 7, wherein the plurality of first concave portions are arranged at intervals along the first direction.

9. The lens driving module as claimed in claim 8, wherein the plurality of second concave portions and the plurality of first concave portions are aligned along the optical axis direction, respectively.

10. The lens driving module as recited in claim 8, wherein the second recess has a shape identical to the first recess.