Lens driving mechanism

Abstract

The application discloses a lens driving mechanism, which comprises a base, a frame and a carrier. The base is internally provided with a first coil. The frame is annular and extends around the optical axis direction and is movably connected to the base. The base is provided with a first magnet and a second magnet. The carrier is movably connected to the ring of the frame and is provided with a second coil. The polarity of the first magnet is distributed along the direction perpendicular to the optical axis direction and is oppositely arranged to the first coil along the optical axis direction. The first magnet and the first coil can drive the frame to move along the first direction and the second direction. The first direction and the second direction are perpendicular to the optical axis direction. The side opposite to the first magnet and the first coil is provided with a first groove. The polarity of the second magnet is distributed along the optical axis direction and is oppositely arranged to the second coil along the direction perpendicular to the optical axis direction. The second magnet and the second coil can drive the carrier to move along the optical axis direction. The side opposite to the second magnet and the second coil is provided with a second groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens driving, in particular to a lens driving mechanism. BACKGROUND

[0002] With the continuous development and wide application of terminal devices, the auto-focusing function is applied to more and more terminal devices such as smart phones and tablet computers. The terminal device configured with the auto-focusing function can automatically focus on the photographed object during shooting, and realize clear imaging of the photographed object.

[0003] The auto-focusing and anti-shake functions of the lens driving mechanism generally rely on the cooperation of the magnet and the coil. After the coil is powered on, the magnetic field of the magnet can make the moving charge in the coil produce Lorentz force, which is the thrust to push the lens.

[0004] The size of the Lorentz force will affect the thrust of the lens driving mechanism, and then affect the speed of auto-focusing and anti-shake of the terminal device, so it is important to improve the Lorentz force between the magnet and the coil. SUMMARY

[0005] The purpose of the present application is to provide a lens driving mechanism which can quickly realize lens focusing and anti-shake.

[0006] To solve the above technical problems, an embodiment of the present application provides a lens driving mechanism for driving the lens to move, comprising:

[0007] a base, wherein the base is provided with a first coil;

[0008] a frame, wherein the frame is annular and extends around the optical axis direction, and is movably connected to the base, and the base is provided with a first magnet and a second magnet;

[0009] a carrier, wherein the carrier is movably connected to the ring of the frame and is provided with a second coil;

[0010] The polarity of the first magnet is distributed along the direction perpendicular to the optical axis direction, and the first magnet and the first coil are oppositely arranged along the optical axis direction, and the first magnet and the first coil cooperate to drive the frame to move along a first direction and a second direction, and the first direction and the second direction are perpendicular to the optical axis direction; the side surface opposite to the first magnet and the first coil is provided with a first groove;

[0011] The polarity of the second magnet is distributed along the optical axis direction, and the second magnet and the second coil are oppositely arranged along a direction perpendicular to the optical axis direction. The second magnet and the second coil cooperate to drive the carrier to move along the optical axis direction. The side of the second magnet opposite to the second coil is provided with a second groove.

[0012] In one embodiment, the first magnet extends along the first direction, and the polarity of the first magnet is distributed along the first direction. A plurality of the first grooves are arranged along the first direction.

[0013] In one embodiment, a plurality of the first magnets are stacked along the second direction.

[0014] In one embodiment, the side of the first magnet away from the first coil is provided with a plurality of the first cavities, and the first cavities are aligned with the first grooves along the optical axis direction.

[0015] In one embodiment, a plurality of the first grooves are arranged along the second direction.

[0016] In one embodiment, a plurality of the first magnets are stacked along the second direction, and adjacent two of the first magnets are arranged to attract each other.

[0017] In one embodiment, the second magnet extends along the first direction or the second direction, and a plurality of the second grooves are arranged along the optical axis direction.

[0018] In one embodiment, a plurality of the second magnets are stacked along the optical axis direction, and adjacent two of the second magnets are arranged to attract each other.

[0019] In one embodiment, the side of the second magnet away from the second coil is provided with a second cavity.

[0020] In one embodiment, the lens driving mechanism further comprises:

[0021] a housing connected to the top of the base and covering the outside of the frame and the carrier;

[0022] an upper spring plate located at the top of the frame and the carrier and connected to the frame and the carrier;

[0023] a lower spring plate located at the bottom of the frame and the carrier and connected to the frame and the carrier; and

[0024] a plurality of suspension wires, the top ends of the plurality of suspension wires being connected to the upper spring plate, and the bottom ends extending beyond the bottom of the frame along the optical axis direction and being connected to the base.

[0025] The first magnet and the second magnet are respectively provided with grooves, so that the Lorentz force between the first magnet and the first coil and the Lorentz force between the second magnet and the second coil are increased, the thrust of the driving frame and the carrier is improved, and the driving frame and the carrier can be driven more quickly. Moreover, the first magnet and the second magnet are provided with grooves, so that the weight of the first magnet and the second magnet is reduced, the overall weight of the lens driving mechanism is reduced, and the lens driving mechanism is more flexible. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 and Figure 2 is an exploded view of a lens driving mechanism according to an embodiment of the present application.

[0027] Figure 3 is Figure 1 is an assembly view of the frame, the carrier, the upper spring piece, the lower spring piece, the suspension wire and the base in the lens driving mechanism according to the embodiment shown in FIG. 1.

[0028] Figure 4 is a schematic view of the first magnet and the first coil according to an embodiment of the present application.

[0029] Figure 5 is a schematic view of the first magnet and the first coil according to another embodiment of the present application.

[0030] Figure 6 is a schematic view of the second magnet and the second coil according to an embodiment of the present application.

[0031] Figure 7 is a schematic view of the second magnet and the second coil according to another embodiment of the present application.

[0032] Figure 8 is Figure 1 is an assembly view of the first magnet, the second magnet and the carrier according to the embodiment shown in FIG. 1.

[0033] Figure 9 is Figure 8 is a perspective view of the first magnet and the second magnet according to the embodiment shown in FIG. 1.

[0034] Figure 10 is an assembly view of the first magnet, the second magnet, the carrier and the base according to an embodiment of the present application.

[0035] Figure 11 is Figure 10 is an assembly view of the first magnet, the second magnet and the carrier according to the embodiment shown in FIG. 1.

[0036] Figure 12 is Figure 10 is a perspective view of the first magnet and the second magnet according to the embodiment shown in FIG. 1.

[0037] Reference numerals: 100, lens driving mechanism; 1, base; 11, first coil; 12, bottom plate; 13, circuit board; 2, frame; 21, first magnet; 211, first recess; 22, second magnet; 221, second recess; 222, second recessed cavity; 3, carrier; 31, second coil; 4, upper spring leaf; 5, lower spring leaf; 6, suspension wire; 7, housing. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the claims of the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0039] Unless otherwise required by the context, throughout the specification and claims, the words "comprise" and variations such as "comprising" and "comprises" will be understood to mean "including, but not limited to".

[0040] The embodiments of the present application will be described in detail below with reference to the drawings, so as to make the objects, features and advantages of the present application clearer. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but are only intended to illustrate the essential spirit of the technical solutions of the present application.

[0041] Throughout the specification, the mention of "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. Therefore, the occurrence of "in one embodiment" or "in an embodiment" at various locations throughout the specification does not necessarily refer to the same embodiment. In addition, a particular feature, structure or characteristic can be combined in any way in one or more embodiments.

[0042] As used in this specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the content clearly dictates otherwise.

[0043] In the following description, in order to clearly show the structure and working mode of the present application, many directional words will be used for description, but the words "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", "down" and the like should be understood as convenient words, and should not be understood as limiting words.

[0044] The present application relates to a lens driving mechanism 100 which is light and has a large thrust force and can be used to drive a lens to move, and a lens driving mechanism 100 of an embodiment of the present application will be described in detail below with reference to the drawings.

[0045] As shown in Figure 1 , the lens driving mechanism 100 includes a base 1, a frame 2, a carrier 3, an upper spring piece 4, a lower spring piece 5, four suspension wires 6, and a shell 7. The base 1 is used to carry the frame 2 and the carrier 3, and the shell 7 is used to prevent external foreign matter from interfering with the movement of the frame 2 and the carrier 3. The carrier 3 is used to mount a lens and can drive the lens to move along the optical axis direction Z to adjust the focal length of the lens. The frame 2 is used to cooperate with the carrier 3 to prevent the lens from shaking. The upper spring piece 4 and the lower spring piece 5 are used to drive the carrier 3 to reset. The four suspension wires 6 can be used to suspend the frame 2 above the base 1 to prevent the frame 2 from touching the base 1 during movement.

[0046] Specifically, the base 1 includes a bottom plate 12 and a circuit board 13, and the plane of the bottom plate 12 is perpendicular to the optical axis direction Z of the lens. Figure 1 In the embodiment shown in , the bottom plate 12 is a rectangular plate, and it should be understood that in other embodiments, the bottom plate 12 can also be a circular plate or a plate of other shapes.

[0047] The built-in circuit in the bottom plate 12 can be electrically connected with an external power supply.

[0048] The circuit board 13 is laid on the top surface of the bottom plate 2 and is clamped with the bottom plate, and the circuit board 13 is electrically connected with the built-in circuit in the bottom plate 12. In addition, the circuit board 13 is also provided with a first coil 11. It should be understood that the circuit board 13 can also not be provided, and the first coil 11 can be directly arranged in the interior of the bottom plate and electrically connected with the built-in circuit.

[0049] Figure 2 The frame 2 is annular and extends along the optical axis direction Z, and the frame 2 is suspended above the circuit board 13 and is provided with a first magnet 21 and a second magnet 22, wherein the first magnet 21 and the first coil 11 cooperate to drive the frame 2 to move along a first direction X or a second direction Y. The first direction X and the second direction Y are two directions perpendicular to each other in the radial direction, and both the first direction X and the second direction Y are perpendicular to the optical axis direction Z of the lens. Figure 3 In the embodiment shown in , the two opposite sides of the bottom plate 12 are parallel to the first direction X, and the other two sides are parallel to the second direction Y.

[0050] The side of the first magnet 21 opposite to the first coil 11 is provided with a first recess 211, and the first recess 211 is located between the two polarities of the first magnet 21 and is open towards the first coil 11.

[0051] In the prior art, the magnetized regions of the first magnet 21 are concentrated in two magnetized regions of the first magnet 21, i.e. the two magnetized regions form N and S poles. After the first recess 211 is opened between the two polarities of the first recess 21, part of the magnetized regions are distributed near the first recess 211, thereby increasing the number of magnetized regions inside the first magnet 21, and further changing the distribution of magnetic field lines, i.e. increasing the magnetic field lines from the N or S pole of the first magnet 21 to the vicinity of the first recess 211. Since the first recess 211 is closer to the first coil 11, part of the magnetic field lines will also pass through the first coil 11, thereby greatly increasing the magnetic flux passing through the first coil 11 of the first magnet 21, improving the Lorentz force generated by the first magnet 21 and the first coil 11, and further increasing the thrust of the driving frame 2.

[0052] In the first embodiment, as shown in Figure 4 the first magnet 21 extends along the first direction X and is arranged opposite to the first coil 11 along the optical axis direction Z, and the polarity of the first magnet 21 is distributed along the first direction X, i.e. the N and S poles of the first magnet 21 are respectively located at the two ends of the first magnet 21 along the first direction X. The first recess 211 is located on the side of the first magnet 21 along the optical axis direction Z and is open towards the first coil 11, and the first recess 211 is recessed from the bottom surface of the first magnet 21 and preferably penetrates the first magnet 21 along the second direction Y. The first coil 11 is located at the bottom of the first recess 211. The magnetic field lines of the first magnet 21 pass through the first coil 11 in two parts, wherein the first part of the magnetic field lines passes through the first coil 11 from the two ends of the first magnet 21 along the first direction X, and the second part of the magnetic field lines passes through the first coil 11 from the two ends of the first magnet 21 along the first direction X to the first recess 211 respectively. Compared with the prior art, the magnetic flux passing through the first coil 11 of the first magnet 21 is significantly increased. Optionally, a plurality of first recesses 211 can be provided, and the plurality of first recesses 211 can be arranged at intervals along the first direction X.

[0053] As a more preferred solution, the first magnet 21 is provided with a first recess cavity away from the side of the first magnet 21 away from the first coil 11, or a plurality of first recess cavities, the number of first recess cavities can be different from the number of first recesses 211, and preferably the number of first recess cavities and the number of first recesses 211 are consistent and the shapes are the same, and the plurality of first recess cavities are preferably aligned with the plurality of first recesses 211 along the optical axis direction Z, which can increase the stability of the shape and magnetic field of the first magnet 21.

[0054] More preferably, a plurality of first magnets 21 are provided on the frame 2, the plurality of first magnets 21 are stacked along the second direction Y and the adjacent two first magnets 21 are arranged to attract each other, and the number of first magnets 21 is not limited.

[0055] In the second embodiment, the first magnet 21 extends along the first direction X and is positioned opposite the first coil 11 along the optical axis direction Z. The polarity of the first magnet 21 can be distributed along the second direction Y. In this embodiment, the polarities of the first magnet 21 are located on both sides along the first direction X. The first groove 211 is located on the bottom surface opposite the first coil 11 and extends through the first magnet 21 along the first direction X. Similarly, the magnetic field lines of the first magnet 21 are also divided into two parts. One part of the magnetic field lines passes through the first coil 11 from both sides of the first magnet 21 along the second direction Y, and the other part of the magnetic field lines extends from both sides of the first magnet 21 along the second direction Y to the first groove 211 and passes through the first coil 11. The arrangement of the first groove 211 also increases the magnetic flux and Lorentz force of the first magnet 21 and the first coil 11.

[0056] Similar to the first embodiment, in this example, the first magnet 21 can also be provided with multiple first grooves 211, and the side of the first magnet 21 that is opposite to the first coil 11 can also be provided with a first cavity, which will not be described in detail here.

[0057] Furthermore, as a preferred embodiment, the two first magnets 21 are stacked along the second direction Y, such as... Figure 5 As described above, the two first magnets 21 attract each other, and each first magnet 21 has a first groove 211 on the side opposite to the first coil 11. The magnetic field lines after the two first magnets 21 are combined can be divided into three parts: the first part of the magnetic field lines runs from the N pole to the S pole of each of the two first magnets 21 and passes through the first coil 11; the second part of the magnetic field lines runs from the N pole of one of the two first magnets 21 to the S pole of the other and passes through the first coil 11; the third part of the magnetic field lines runs from the first groove 211 of each of the two first magnets 21 to their respective N pole or S pole and passes through the first coil 11. The three parts of the magnetic field lines passing through the first coil 11 can greatly increase the magnetic flux from the first magnet 21 to the first coil 11.

[0058] It should be understood that more first magnets 21 stacked along the second direction Y can also be provided, with adjacent first magnets 21 attracting each other and each first magnet 21 having a first groove 211. Preferably, each first magnet 21 has a first cavity on the side facing away from the first coil 11, and the number of first cavities is the same as the number of first grooves 211 and they are aligned along the optical axis direction Z, which can increase the stability of multiple first magnets 21.

[0059] In addition, the first magnet 21 can also extend in any radial direction. For example, the first magnet 21 can be tilted relative to the first direction X or the second direction Y and installed at the four corners of the frame 2. The polarity distribution of the first magnet 21 only needs to be perpendicular to the optical axis, and the extension direction of the first magnet 21 is not restricted.

[0060] The second magnet 22 extends along the second direction Y and is arranged opposite to the second coil 31 along the first direction X, as shown in Figure 6 The polarity of the second magnet 22 is distributed along the optical axis direction Z, and the second groove 221 is arranged on the side of the second magnet 22 adjacent to the second coil 31, i.e. on one side of the second magnet 22 along the first direction X. The magnetic field lines of the second magnet 22 are also divided into two parts, the first part of the magnetic field lines passes through the second coil 31 from the top to the bottom of the second magnet 22, and the second part of the magnetic field lines passes through the second coil 31 from the top or bottom of the second magnet 22 to the second groove 221. The second groove 221 also increases the magnetic flux of the second magnet 22 passing through the second coil 31.

[0061] Further, as shown in Figure 7 Two second magnets 22 are stacked along the optical axis direction Z, and each second magnet 22 is provided with a second groove 221 on the side opposite to the second coil 31, and the two second magnets 22 are attracted to each other, i.e. the N poles or S poles of the two second magnets 22 abut each other. Compared with the case of a single second magnet 22, after the two second magnets 22 are stacked, a part of the magnetic field lines can be increased, which passes through the second coil 31 from the N pole of one of the two second magnets 22 to the S pole of the other second magnet 22, further increasing the magnetic flux and Lorentz force passing through the second coil 31. It should be understood that more second magnets 22 can also be arranged according to the needs, and the adjacent two second magnets 22 can be attracted to each other.

[0062] It should be understood that more second grooves 221 can also be arranged, and the plurality of second grooves 221 can be arranged at intervals along the optical axis direction Z, and new magnetic field lines can be formed between the adjacent two second grooves 221, which can also increase the magnetic flux passing through the second coil 31.

[0063] The side of the second magnet 22 away from the second coil 31 can also be provided with a second recess 222, and the number of the second recess 222 can be single or multiple, and the number of the second recess 222 is preferably the same as the number of the second groove 221 and is aligned along the first direction X, which can increase the stability of the second magnet 22. In the embodiment shown in Figure 7 The side of the second magnet 22 away from the second coil 31 can also be provided with a second recess 222, and the number of the second recess 222 can be single or multiple, and the number of the second recess 222 is preferably the same as the number of the second groove 221 and is aligned along the first direction X, which can increase the stability of the second magnet 22. In the embodiment shown in

[0064] The second magnet 22 can also be arranged to extend along the first direction X and oppositely arranged to the second coil 31 along the second direction Y, or the second magnet 22 can extend along any radial direction, for example, the second magnet 22 can be arranged to be inclined relative to the first direction X or the second direction Y and installed at four corners of the frame 2, the polarity distribution of the second magnet 22 is parallel to the optical axis, and the extension direction of the second magnet 22 is not limited, as long as the second magnet 22 is oppositely arranged to the second coil 31 along the radial direction and the polarity is distributed along the optical axis direction Z.

[0065] The upper spring 4 and the lower spring 5 are respectively elastic, the upper spring 4 is located at the top of the frame 2 and the carrier 3, the lower spring 5 is located at the bottom of the frame 2 and the carrier 3, the upper spring 4 and the lower spring 5 are respectively connected with the frame 2 and the carrier 3, and the upper spring 4 and the lower spring 5 cooperate to drive the carrier 3 to reset after the movement of the carrier 3.

[0066] The four suspension wires 6 are respectively located at four corners of the frame 2, the top ends of the four suspension wires 6 are respectively connected with the upper spring 4, the bottom ends extend along the optical axis direction Z and beyond the bottom of the frame 2, and the bottom ends of the four suspension wires 6 are respectively connected with the base 1 so that the frame 2 and the base 1 are arranged to be spaced apart.

[0067] The shell 7 has a containing space for containing the frame 2, the carrier 3, the upper spring 4, the lower spring 5 and the four suspension wires 6, and the bottom of the shell 7 is open and connected with the base 1.

[0068] The first magnet 21 and the second magnet 22 are respectively provided with grooves, so that the Lorentz force between the first magnet 21 and the first coil 11 and the Lorentz force between the second magnet 22 and the second coil 31 are increased, the driving force of the frame 2 and the carrier 3 is improved, the frame 2 and the carrier 3 can be driven to move more quickly, and fast focusing and anti-shake are realized. Moreover, after the grooves are provided in the first magnet 21 and the second magnet 22, the weight of the first magnet 21 and the second magnet 22 can be reduced, the overall weight of the lens driving mechanism 100 is reduced, and the lens driving mechanism 100 is more light and flexible.

[0069] The preferred embodiments of the present application have been described in detail above, but it should be understood that aspects of the embodiments can be modified to employ aspects, features and concepts of various patents, applications and publications to provide additional embodiments if desired.

[0070] These and other changes can be made to the embodiments in light of the above detailed description. The terms used in the claims have their normal ordinary meaning in the patent law and not only in the specification and the claims. It will be understood that certain features and subcombinations are of utility and can be employed in various

[0071] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and various changes can be made in form and details in practical application without departing from the spirit and scope of the present application.

Claims

1. A lens driving mechanism for driving a lens movement, characterized by, The lens driving mechanism comprises: a base, wherein a first coil is arranged in the base; a frame, wherein the frame is annular and extends along an optical axis direction, and is movably connected to the base, and the base is provided with a first magnet and a second magnet; a carrier, wherein the carrier is movably connected to the ring of the frame and is provided with a second coil; polarities of the first magnet are distributed along a direction perpendicular to the optical axis direction, and the first magnet and the first coil are oppositely arranged along the optical axis direction, and the first magnet and the first coil cooperate to drive the frame to move along a first direction and a second direction, and the first direction and the second direction are perpendicular to the optical axis direction in pairs; a first groove is arranged on a side of the first magnet opposite to the first coil; polarities of the second magnet are distributed along the optical axis direction, and the second magnet and the second coil are oppositely arranged along a direction perpendicular to the optical axis direction, and the second magnet and the second coil cooperate to drive the carrier to move along the optical axis direction, and a second groove is arranged on a side of the second magnet opposite to the second coil; the first magnet extends along the first direction, and polarities of the first magnet are distributed along the first direction, and a plurality of the first grooves are arranged along the first direction at intervals; the second magnet extends along the first direction or the second direction, and a plurality of the second grooves are arranged along the optical axis direction at intervals.

2. The lens driving mechanism according to claim 1, wherein a plurality of the first magnets are stacked along the second direction.

3. The lens driving mechanism according to claim 1, wherein a plurality of first cavities are arranged on a side of the first magnet opposite to the first coil, and the first cavities are aligned with the first grooves along the optical axis direction.

4. The lens driving mechanism according to claim 1, wherein a plurality of the first magnets are stacked along the second direction, and adjacent two of the first magnets are oppositely arranged.

5. The lens driving mechanism according to claim 1, wherein a plurality of the second magnets are stacked along the optical axis direction, and adjacent two of the second magnets are oppositely arranged.

6. The lens driving mechanism according to claim 1, wherein a second cavity is arranged on a side of the second magnet opposite to the second coil.

7. The lens driving mechanism according to claim 1, wherein The lens driving mechanism further comprises: a housing, wherein the housing is connected to a top of the base and covers an outside of the frame and the carrier; an upper spring sheet, wherein the upper spring sheet is arranged on a top of the frame and the carrier and is connected to the frame and the carrier; a lower spring sheet, wherein the lower spring sheet is arranged on a bottom of the frame and the carrier and is connected to the frame and the carrier; and a plurality of suspension wires, wherein top ends of the plurality of suspension wires are connected to the upper spring sheet, and bottom ends of the plurality of suspension wires extend beyond a bottom of the frame along the optical axis direction and are connected to the base.

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