Lens driving mechanism

Abstract

The application discloses a lens driving mechanism, which comprises an outer frame, a movable frame, a driving motor and a first reset member. The outer frame is annular and is provided with a circuit board, a first coil and a chip. The circuit board is connected to the outer frame. The first coil is electrically connected to the circuit board. The chip is electrically connected to the circuit board. The movable frame is annular and is movably installed in the outer frame. The movable frame is provided with a first magnet. The first reset member is used for driving the movable frame to reset. The driving motor is installed in the movable frame and comprises an inner frame, an inner shell and a carrier. The inner shell is connected to the inner frame and is provided with a second magnet. The carrier is movably installed in the inner frame. The carrier is used for installing a lens. The carrier is provided with a second coil. The second coil is electrically connected to the circuit board and is used for driving the carrier to move along the optical axis of the lens in cooperation with the second magnet. A second reset member is used for driving the carrier to reset. The chip is used for controlling the first coil and the second coil to operate.

Description

TECHNICAL FIELD

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

[0002] With the development of electronic technology, portable consumer electronic products are more and more popular, such as mobile phones, handheld game consoles, and navigation devices. With the development of technology, these electronic devices are becoming more and more popular, and are developing towards the direction of convenience and thinness, so as to provide users with more choices.

[0003] In practice, in order to adapt to various scene shooting, the lens needs to be continuously focused, and the lens needs to be prevented from being damped during focusing or shooting. In the prior art, a lens driving mechanism is generally used to drive the lens to move along the optical axis direction to adjust the focal length, and the lens driving mechanism includes a carrier and a movable frame. The carrier is used to install the lens, and the carrier can drive the lens to move along the optical axis.

[0004] In order to drive the lens to move more quickly, it is necessary to make the driving motor more lightweight, so as to meet the market demand. In addition, a circuit board needs to be arranged inside the lens driving mechanism, and the structure of the circuit board needs to be connected with the parts of the lens driving mechanism as stably as possible, because a lens driving mechanism with stable structure needs to be developed. SUMMARY

[0005] The purpose of the present application is to provide a lens driving mechanism to solve the above problems.

[0006] To solve the above technical problems, the present application provides a lens driving mechanism, comprising:

[0007] An outer frame, which is annular and is provided with:

[0008] A circuit board connected to the outer frame;

[0009] A first coil electrically connected to the circuit board;

[0010] A chip electrically connected to the circuit board;

[0011] A movable frame, which is annular and movably installed in the outer frame, and is provided with a first magnet;

[0012] A first reset member operable to drive the movable frame to reset; and

[0013] A driving motor installed in the movable frame and comprising:

[0014] An inner frame, which is annular;

[0015] an inner shell connected to the inner frame and provided with a second magnet;

[0016] a carrier, the carrier being movably mounted in the inner frame and being used to mount a lens, the carrier having a second coil wound around its periphery, the second coil being electrically connected to the circuit board and cooperating with the second magnet to drive the carrier to move along the optical axis of the lens; and

[0017] a second restoring member operable to drive the carrier to reset;

[0018] The chip can control the operation of the first coil and the second coil.

[0019] In one embodiment, the outer frame comprises:

[0020] an annular body, the annular body being in a rectangular ring shape, the movable frame being movably mounted in the annular body, and the first coil being mounted in the annular body; and

[0021] An extension plate, the extension plate is annular and sleeved outside the annular body, the extension plate extends along the circumference of the annular body and is located at the bottom of the annular body;

[0022] The circuit board comprises:

[0023] a first plate, the first plate being located on a top surface of the extension plate and extending circumferentially along the extension plate, the first plate being clamped to the extension plate;

[0024] a second plate, the second plate being located at the bottom of the extension plate and extending along the circumference of the extension plate to form a ring shape, the second plate being electrically connected to the first plate; and

[0025] A third plate is mounted on the annular body and is electrically connected to the second plate and the first coil.

[0026] In one embodiment, the extension plate is rectangular and annular, and the four sides of the extension plate are respectively provided with avoidance grooves, and the avoidance grooves extend from the bottom surface to the top surface of the extension plate; the annular body is provided with four mounting grooves, and the four mounting grooves are respectively connected to the four avoidance grooves;

[0027] The third plate includes four side circuit boards, the bottom ends of the four side circuit boards are respectively connected to the second plates, and the top ends extend from the four avoidance grooves to the four mounting grooves; the four first coils are respectively electrically connected to the four side circuit boards and are respectively located in the four mounting grooves; the four second magnets are respectively located on the sides of the movable frame and are respectively aligned radially with the four first coils.

[0028] In one embodiment, the extension plate is provided with a limiting post at the edge of the extension plate, the limiting post is located radially outside the first plate.

[0029] In one embodiment, the bottom surface of the extension plate is further provided with a recess, the recess extends along the circumference of the extension plate and communicates with the avoiding groove, and the second plate is located in the recess.

[0030] In one embodiment, the bottom of the outer frame is provided with a plurality of first mounting positions, the bottom of the movable frame is provided with a plurality of second mounting positions, the plurality of second mounting positions are respectively aligned with the plurality of first mounting positions along the radial direction, and the second mounting positions are offset towards the top relative to the first mounting positions.

[0031] The first reset member includes a plurality of spring wires, the outer ends of the plurality of spring wires are respectively connected with the plurality of first mounting positions, and the inner ends are respectively connected with the second mounting positions.

[0032] In one embodiment, the four corners of the outer frame are respectively provided with a first groove body, the first groove body is formed by extending the inner surface of the annular body towards the outside, and the depth of the first groove body along the axial direction gradually decreases from inside to outside.

[0033] The bottom surface of the movable frame is respectively provided with four second groove bodies, the four second groove bodies are respectively recessed from the outer surface of the movable frame towards the inside; the depth of the four second groove bodies along the axial direction is the same as the inner ends of the four first groove bodies along the axial direction, and the inner ends of the four first groove bodies are respectively arranged opposite to the four second groove bodies along the radial direction.

[0034] The four first mounting positions are respectively located on the top wall of the four first groove bodies and at the outer ends of the first groove bodies; the four second mounting positions are respectively located on the top wall of the second groove bodies; the outer ends of the four spring wires are respectively connected with the four first mounting positions, and the inner ends are respectively connected with the four second mounting positions.

[0035] In one embodiment, the annular body is provided with a first avoiding hole, the first avoiding hole extends from the bottom of the annular body towards the top surface, the extension plate is provided with a first shoulder, the first shoulder extends from the inner surface of the extension plate into the avoiding hole;

[0036] The movable frame includes:

[0037] An annular support, the annular support is annular and movably installed in the annular body, and the driving motor is installed in the annular support;

[0038] A first protrusion, the first protrusion is connected to the outer side of the annular support and located on the top surface of the first shoulder.

[0039] In one embodiment, the annular bracket is provided with a second avoidance hole, the second avoidance hole extending from the top toward the bottom of the annular bracket and radially aligned with the first avoidance hole;

[0040] The circuit board also includes a connecting piece, the outer end of which is electrically connected to the first board, and the inner end of which extends into the annular bracket through the first avoidance hole and the second avoidance hole in sequence. The connecting piece covers the top surface of the first protrusion and is electrically connected to the second coil.

[0041] In one embodiment, the inner frame comprises:

[0042] an annular frame, wherein the carrier is installed in the annular frame,

[0043] A second protrusion is connected to the outer side of the annular frame and radially passes through the second avoidance hole and the first avoidance hole in sequence and extends to the outside of the annular body. The second protrusion is located on the top surface of the connecting piece.

[0044] In one embodiment, the inner frame is provided with a built-in circuit, and the built-in circuit is electrically connected to the connecting piece and the second coil.

[0045] In one embodiment, a limiting groove is provided on the inner surface of the annular body, the limiting groove is located at a corner of the annular body, and the limiting groove extends from the top surface to the bottom surface of the annular body;

[0046] A limiting protrusion is provided on the radial outer side of the annular bracket. The limiting protrusion is located in the limiting groove, and the size of the limiting protrusion is smaller than the size of the limiting groove.

[0047] In one embodiment, it further includes:

[0048] a base mounted on the bottom of the outer frame;

[0049] The shell is connected to the base and covers the outside of the outer frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0051] Figure 1 and Figure 2 FIG. 4 is an exploded view of a lens driving mechanism according to an embodiment of the present invention.

[0052] Figure 3 yesFigure 1 Assembly view of the base, outer frame, circuit board and first return member of the embodiment shown.

[0053] Figure 4 is Figure 1 Assembly view of the circuit board, movable frame and drive motor of the embodiment shown.

[0054] Figure 5 is Figure 1 Exploded view of the movable frame, first return member, outer frame and circuit board of the embodiment shown.

[0055] Figure 6 is Figure 5 Assembly view of the movable frame, first return member, outer frame and circuit board of the embodiment shown.

[0056] Figure 7 is Figure 1 Exploded view of the movable frame, first return member and outer frame of the embodiment shown.

[0057] Figure 8 is Figure 1 Assembly view of the outer frame, movable frame and first return member of the embodiment shown.

[0058] Figure 9 is Figure 1 Assembly view of the circuit board, movable frame and drive motor of the embodiment shown.

[0059] Figure 10 and Figure 11 is Figure 1 Exploded view of the drive motor of the embodiment shown.

[0060] Reference signs: 100, lens driving mechanism; 1, base; 2, housing; 3, outer frame; 31, annular main body; 311, limiting groove; 312, mounting slot; 313, clamping block; 314, first avoiding hole; 32, extension plate; 321, avoiding slot; 322, groove; 323, first shoulder; 33, limiting column; 34, first coil; 35, first slot body; 4, movable frame; 41, annular support; 42, limiting protrusion; 43, first magnet; 44, second avoiding hole; 45, first protrusion; 46, second slot body; 47, second shoulder; 5, drive motor; 51, inner frame; 511, annular frame; 512, second protrusion; 513, first protruding part; 52, inner housing; 53, carrier; 54, upper spring sheet; 55, lower spring sheet; 56, second magnet; 6, circuit board; 61, first plate; 62, second plate; 63, third plate; 631, clamping slot; 64, fourth plate; 65, fifth plate; 66, connecting sheet; 67, clamping sheet; 68, chip; 69, imaging chip; 7, spring wire; 71, connecting hole. DETAILED DESCRIPTION

[0061] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, it should be understood that, for the persons of ordinary skill in the art, many technical details are presented in the various embodiments of the present application for the purpose of better understanding the present application. However, the technical solutions claimed by the present application can be implemented even if these technical details are not presented and various changes and modifications based on the following various embodiments.

[0062] In the following description, for the purpose of illustrating the various disclosed embodiments, specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, persons of ordinary skill in the art will recognize that embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring the description of embodiments.

[0063] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

[0064] The various 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 only intended to illustrate the essential spirit of the present application, but not to limit the scope of the present application.

[0065] 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, the appearances of the phrase "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 can be combined in any suitable manner in one or more embodiments.

[0066] 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 "comprising" or "comprises" is generally used herein in the sense of "including" or "includes" but not limited to.

[0067] 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 of "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.

[0068] The present invention relates to a lens driving mechanism 100, such as Figure 1 and Figure 2 As shown, the lens drive mechanism 100 includes a base 1, a housing 2, an outer frame 3, a movable frame 4, a drive motor 5, and a first reset member. The base 1 is in the shape of a rectangular plate, and the housing 2 is connected to the top surface of the base 1 and cooperates with the base 1 to form a storage space for accommodating the outer frame 3, the movable frame 4, and the drive motor 5.

[0069] Specifically, if Figure 2 and Figure 3 As shown, the outer frame 3 is rectangular and annular and is mounted on the top surface of the base 1 and is located inside the outer shell 2. The outer frame 3 is fixedly connected to the base 1. The outer frame 3 includes an annular body 31, an extension plate 32, and three limiting posts 33 located on the top surface of the extension plate 32. The annular body 31 is rectangular and has four side portions, and is mounted on the top surface of the base 1. The extension plate 32 is also rectangular and annular and is sleeved on the outside of the annular body 31. The extension plate 32 is located on the bottom surface of the annular body 31, and the bottom surface of the extension plate 32 is flush with the bottom surface of the annular body 31. The three limiting posts 33 are located at the three corners of the extension plate 32, and are spaced apart from the annular body 31.

[0070] The movable frame 4 can be movably installed in the outer frame 3. Specifically, Figure 4 、 Figure 5 and Figure 6 As shown, the movable frame 4 includes an annular support 41 and two limiting protrusions 42. The annular support is rectangular and annular and is located within the annular body 31. The annular support 41 is spaced apart from the inner surface of the annular body 31, thereby allowing the annular support 41 to move within the annular body 31. The limiting protrusions 42 are located on the outer surface of the annular support and are respectively located at a set of opposite corners of the annular support. The limiting protrusions 42 extend from the top surface of the annular support to the bottom surface. The inner surface of the annular body 31 is provided with two limiting grooves 311. The two limiting grooves 311 are located at the opposite corners of the annular body 31 corresponding to the two limiting protrusions 42 and extend from the top surface of the annular body 31 to the bottom surface. The two limiting grooves 311 respectively accommodate the two limiting protrusions 42. In addition, the shape of the limiting groove 311 matches the shape of the limiting protrusion 42, and the axial, circumferential and radial dimensions of the limiting groove 311 are all larger than the dimensions of the limiting protrusion 42, that is, the two limiting grooves 311 can allow the two limiting protrusions 42 to move inside them and can limit the rotation range of the limiting protrusion 42 to a certain extent.

[0071] The four sides of the annular bracket 41 are respectively provided with a first magnet 43, and the four first magnets 43 are respectively embedded in the interior of the annular bracket without taking up additional space. The four sides of the annular body 31 are respectively provided with a first coil 34, and the four first coils 34 cooperate with the four first magnets 43 to drive the movable frame 4 to move.

[0072] The four first coils 34 are electrically connected to the circuit board 6. The circuit board 6 comprises a first plate 61, a second plate 62, a third plate 63, a fourth plate 64 and a fifth plate 65. The first plate 61 is annularly sleeved outside the annular main body 31 and stacked on the top surface of the extension plate 32. The first plate 61 is located radially inward of the three limiting columns 33 and is provided with a connecting hole which is sleeved on the connecting column on the top surface of the extension plate 32, so as to enhance the connection stability of the first plate 61 and the extension plate 32. In addition, the first plate 61 can also be clamped with the extension plate 32 in other ways, and the specific clamping way is not limited.

[0073] The second plate 62 is also annularly stacked on the bottom surface of the extension plate 32, i.e. the planes where the second plate 62 and the first plate 61 are located are parallel to the plane where the extension plate is located, and are perpendicular to the optical axis direction. The third plate 63 comprises four side circuit boards. The planes where the four side circuit boards are located are substantially perpendicular to the extension plate 32. The bottoms of the four side circuit boards are connected with the second plate 62, and the tops are respectively installed on the four sides of the annular main body 31 and are respectively electrically connected with the four first coils 34.

[0074] In order to facilitate the electrical connection between the second plate 62 and the third plate 63, the four parts of the extension plate 32 are respectively provided with four avoiding grooves 321 which extend from the bottom surface to the top surface of the extension plate 32. The positions and shapes of the four avoiding grooves 321 can be set according to the shape requirements of the four side circuit boards, and the specific shape of the avoiding grooves 321 is not limited. In addition, the four sides of the annular main body 31 are respectively provided with four installation grooves 312 which extend from the outer surface to the inner surface of the annular main body 31, and the bottoms of the four installation grooves 312 are respectively connected with the four avoiding grooves 321. The bottoms of the four side circuit boards of the third plate 63 are respectively located in the four avoiding grooves 321 and are electrically connected with the second plate 62. The tops extend from the avoiding grooves 321 to the installation grooves 312. The four first coils 34 are respectively connected to the inner surfaces of the four side circuit boards and are located in the installation grooves 312.

[0075] The inner surface of the installation groove 312 is also provided with two or more clamping blocks 313. The side circuit board is provided with a plurality of clamping grooves 631 which are respectively clamped in the clamping blocks 313, so as to increase the connection strength of the four side circuit boards in the installation groove 312 and facilitate the positioning and assembly of the side circuit boards in the installation groove 312. The bottom surface of the extension plate is provided with a recess 322 which extends along the circumference of the extension plate and penetrates through the four avoiding grooves 321, so as to accommodate the second plate 62. The second plate 62 is installed in the recess 322, which can enhance the stability between the second plate 62 and the extension plate and can also reduce the occupied space.

[0076] The fourth plate 64 of the circuit board 6 is substantially a rectangular plate and is substantially parallel to the third plate 63, the fourth plate 64 is located outside one side of the third plate 63 and between the first plate 61 and the second plate 62. The top of the fourth plate 64 is welded to the first plate 61 and the bottom is welded to the second plate 62. In the prior art, the circuit board 6 is originally flat and needs to be bent according to the circuit to a predetermined state, but the bent part is easily affected by the original stress, that is, the bent part has a force towards the original state, and the stress will make the bent part move towards the original state, causing instability of the circuit board 6. Moreover, the circuit board 6 is electrically connected to the coil and each chip 68, which will affect the position state of the coil. The circuit board 6 of the present application needs the fourth plate 64 to be bent and connected to the first plate 61 and the second plate 62 by welding, which can avoid the problem of being affected by stress, thereby ensuring the relative stability of the circuit board 6 and the outer frame 3.

[0077] The fifth plate 65 is connected to the first plate 61 and extends away from the first plate 61 towards the outside of the shell 2, which is convenient for electrical connection with the external power supply.

[0078] In addition, one corner of the annular support is also provided with a first avoiding hole 314, as shown in Figure 2 and Figure 6 , the first avoiding hole 314 extends from the top surface of the annular support towards the bottom surface, and the extension plate is provided with a first shoulder 323 at a position corresponding to the first avoiding hole 314 in the radial direction, the first shoulder 323 extends from the inner surface of the extension plate towards the inner surface and is located in the first avoiding hole 314. The outer surface of the annular support 41 is provided with a first protrusion 45, which is aligned with the first avoiding hole 314 and the first shoulder 323 in the radial direction, and is stacked on the top surface of the first shoulder 323, the first protrusion 45 is stacked on the top surface of the first shoulder 323 and located in the first avoiding hole 314.

[0079] The annular support 41 is provided with a second avoiding hole 44 at a position corresponding to the first avoiding hole 314 in the radial direction, the second avoiding hole 44 extends from the top surface of the annular support 41 towards the bottom to the position of the first protrusion 45.

[0080] The circuit board 6 further comprises a connecting piece 66, the outer end of the connecting piece 66 is connected to the corner of the first plate 61 corresponding to the first avoiding hole 314 and is stacked on the top surface of the first protrusion 45; the inner end extends to the inside of the annular support 41 through the first avoiding hole 314 and the second avoiding hole 44 and is electrically connected to the imaging chip 69 located at the bottom of the annular support.

[0081] The movable frame 4 is restored to the original state by the first reset member after movement. Specifically, the four corners of the outer frame 3 are respectively provided with a first slot 35, as shown in Figure 7 and Figure 8As shown, the first grooves 35 are located on the bottom surface of the outer frame 3 and extend from the inner surface of the annular body 31 towards the outside to the extension plate, i.e. the first grooves 35 extend from the bottom surface of the annular body 31 to the bottom surface of the extension plate, the depth of the first grooves 35 gradually increases from the inside to the outside along the axial direction, the top wall of the outer end of the four first grooves 35 is the first mounting position for connecting one end of the first reset member. The four corners of the annular support 41 are provided with second grooves 46, and the second grooves 46 are located on the bottom surface of the annular support 41 and extend from the outer surface of the annular support 41 towards the inside. The four second grooves 46 are respectively aligned with the four first grooves 35 along the radial direction, and the depth of the four second grooves 46 along the axial direction is substantially the same as the depth of the inner end of the four first grooves 35 along the axial direction, but greater than the depth of the outer end of the four first grooves 35. The top wall of the second groove 46 is the second mounting position for connecting the other end of the first reset member.

[0082] Specifically, the first reset member includes four spring wires 7, and the outer end and the inner end of each of the four spring wires 7 is provided with a connecting hole 71, and the first mounting position is provided with a connecting column located in the connecting hole 71 at the outer end of the spring wire 7. The four spring wires 7 are connected to the first mounting position through the cooperation of the connecting holes 71 and the connecting columns. The second mounting position is respectively provided with a connecting column located in the connecting hole 71 at the inner end of the spring wire 7, and the inner end of the four spring wires 7 is respectively connected to the second mounting position of the four second grooves 46.

[0083] Because the top wall of the second groove 46 deviates more towards the top relative to the top wall of the outer end of the first groove 35, the four spring wires 7 are in an inclined state, i.e. the outer end of the four spring wires 7 deviates towards the bottom, and the inner end deviates towards the top, and the four spring wires 7 exert a force towards the bottom on the annular support 41.

[0084] In practice, the movable frame 4 can swing in the annular body 31 or move along the axial direction to adjust the focal length or prevent shaking. For example, the cooperation of the first magnet 43 and the first coil 34 can drive one side of the movable frame 4 to rise or one corner to rise. The two spring wires 7 located at the bottom of the rising side will be stretched, and the two stretched spring wires 7 will exert a downward force on the rising side of the movable frame 4, and the other two spring wires 7 also have a force towards the bottom on the movable frame 4, and the four spring wires 7 cooperate to drive the movable frame 4 to return to the original state. The four spring wires 7 all exert a force towards the bottom on the movable frame 4, and the four spring wires 7 are identical in shape and consistent in elasticity, and can uniformly exert force on the movable frame 4, so that the movable frame 4 moves smoothly and resets stably.

[0085] It should be understood that the number of spring wires 7 is not limited, and two, three or six spring wires 7 can also be provided, and the shape of the spring wire 7 is not limited, and can meet the elastic demand. The number of the first mounting position and the second mounting position is not limited, and the first mounting position can also connect the outer end of the plurality of spring wires 7, and the second mounting position can also connect the inner end of the plurality of spring wires 7, and the combination of the spring wire 7 and the first mounting position and the second mounting position is not limited. In addition, the first groove body 35 can also be provided on the four side portions of the outer frame 3, and the second groove body 46 is provided on the four side portions of the movable frame 4 and is radially aligned with the four first groove bodies 35, and the specific position of the first groove body 35 and the second groove body 46 is not limited.

[0086] The driving motor 5 is installed inside the annular support 41 and is fixedly connected with the annular support 41. Figure 6 In the embodiment shown, the inner surface of the annular support 41 is provided with three second shoulders 47, and the three second shoulders 47 are respectively located at the three corner portions of the annular support 41, that is, the three second shoulders 47 and the second avoiding hole 44 are respectively located at the four corner portions of the annular support 41.

[0087] The driving motor 5 includes an inner frame 51, an inner shell 52, a carrier 53 and a second reset member. As shown in Figure 10 and Figure 11 The inner frame 51 is annular and is installed inside the annular support 41, and the inner frame 51 includes an annular frame 511, a second protrusion 512 connected to the outer surface of the annular frame 511 and three first protruding portions 513, the annular frame 511 is annular and is located inside the annular support 41, and the three first protruding portions 513 are located at the three corner portions of the annular frame 511 and abut against the top surfaces of the three second shoulders 47, so that the inner frame 51 is stably installed inside the annular support 41.

[0088] The second protrusion 512 is a sheet shape and is located at another corner portion of the annular frame 511, as shown in Figure 9 The second protrusion 512 is located at the corner portion corresponding to the first avoiding hole 314 and the second avoiding hole 44, and extends radially from the outer surface of the annular frame 511 to the outside. The second protrusion 512 passes through the second avoiding hole 44 and the first avoiding hole 314 and extends to the outside of the outer frame 3. The second protrusion 512 is located on the top surface of the connecting sheet 66 and is located at the bottom of the first plate 61, that is, the second protrusion 512 holds the connecting sheet 66 and the first plate 61 support, and is electrically connected with the first plate 61 or the connecting sheet 66.

[0089] Specifically, the inner frame 51 is provided with an internal circuit which can extend into the second protrusion 512. The second protrusion 512 can be electrically connected with the connecting piece 66 or the first plate 61, thereby enabling the internal circuit to be electrically connected with the circuit board 6. In addition, in order to strengthen the connection stability between the inner frame 51 and the circuit board 6, the first plate 61 is further provided with a clamping piece 67 which extends from the inner side of the first plate 61 towards the inside and covers the top of the second protrusion 512, and the second protrusion 512 is clamped between the clamping piece 67 and the connecting piece 66. The clamping piece 67 is also provided with a connecting hole, and the top surface of the second protrusion 512 is provided with a connecting column located in the connecting hole, thereby further ensuring the stable connection between the second protrusion 512 and the circuit board 6.

[0090] The inner shell 52 is a rectangular shell and is connected to the top of the inner frame 51. The inner shell 52 and the outer frame 3 are fixedly connected, and the specific connection between the inner shell 52 and the outer frame 3 is not limited, including but not limited to clamping, threaded connection, bonding or other modes. In addition, the inner shell 52 is provided with a plurality of second magnets 56 which are fixedly connected to the inner surface of the inner shell 52.

[0091] The carrier 53 is movably mounted in the annular frame 511 and is provided with a second coil. The carrier 53 is provided with a lens, and the second coil cooperates with the second magnet 56 to drive the carrier 53 to move along the optical axis direction of the lens, thereby adjusting the focal length of the lens.

[0092] The second reset member includes an upper spring piece 54 and a lower spring piece 55. The carrier 53 is elastically connected with the inner shell 52 and the inner frame 51 through the upper spring piece 54 and the lower spring piece 55. The upper spring piece 54 and the lower spring piece 55 are both elastic and can drive the carrier 53 to reset. Specifically, one end of the upper spring piece 54 is connected with the inner surface of the inner shell 52, and the other end is connected with the top of the carrier 53. The lower spring piece 55 is connected with the top of the carrier 53, and the other end is connected with the inner frame 51. The upper spring piece 54 and the lower spring piece 55 cooperate to elastically connect the carrier 53 with the shell and the inner frame 51.

[0093] In addition, the lower spring piece 55 is a conductive metal sheet. One end of the lower spring piece 55 is electrically connected with the second coil of the carrier 53, and the other end is electrically connected with the internal circuit in the inner frame 51. That is, the current can flow from the circuit board 6, the internal circuit of the inner frame 51, the lower spring piece 55 to the second coil.

[0094] The circuit board 6 is further provided with a chip 68 which is located on the top surface of the first plate 61 and is electrically connected with the first plate 61. The chip 68 can control the operation of the first coil 34 and the second coil. In the prior art, the chip 68 is generally located inside the driving motor 5. The chip 68 of the present application is located outside the driving motor 5, which can reduce the internal space of the driving motor 5, make the driving motor 5 more lightweight, and thus more easily drive the carrier 53 and the lens to move, thereby meeting the market demand.

[0095] While preferred embodiments of the present invention 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 further embodiments.

[0096] 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 as limited to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0097] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism, characterized in that: include: The outer frame is annular and has: a circuit board connected to the outer frame; a first coil, the first coil being electrically connected to the circuit board; a chip, wherein the chip is electrically connected to the circuit board; Movable frame; the movable frame is annular and can be movably installed in the outer frame, and the movable frame is provided with a first magnet; a first restoring member operable to drive the movable frame to reset; as well as A drive motor is installed in the movable frame and includes: Inner frame; the inner frame is annular; an inner shell connected to the inner frame and provided with a second magnet; a carrier, the carrier being movably mounted in the inner frame and being used to mount a lens, the carrier having a second coil wound around its periphery, the second coil being electrically connected to the circuit board and cooperating with the second magnet to drive the carrier to move along the optical axis of the lens; and a second restoring member operable to drive the carrier to reset; Wherein, the chip can control the operation of the first coil and the second coil; The outer frame also includes: an annular body, the annular body being in a rectangular ring shape, the movable frame being movably mounted in the annular body, and the first coil being mounted in the annular body; and An extension plate, the extension plate is annular and sleeved outside the annular body, the extension plate extends along the circumference of the annular body and is located at the bottom of the annular body; The circuit board comprises: a first plate, the first plate being located on a top surface of the extension plate and extending circumferentially along the extension plate, the first plate being clamped to the extension plate; a second plate, the second plate being located at the bottom of the extension plate and extending along the circumference of the extension plate to form a ring shape, the second plate being electrically connected to the first plate; and a third plate mounted on the annular body and electrically connected to the second plate and the first coil; A plurality of first mounting positions are provided at the bottom of the outer frame, and a plurality of second mounting positions are provided at the bottom of the movable frame. The plurality of second mounting positions are radially aligned with the plurality of first mounting positions, and the second mounting positions are offset toward the top relative to the first mounting positions. The first restoring member includes a plurality of spring wires, wherein the outer ends of the plurality of spring wires are respectively connected to the plurality of first mounting positions, and the inner ends of the plurality of spring wires are respectively connected to the second mounting positions; The annular body is provided with a first avoidance hole, the first avoidance hole extending from the bottom toward the top surface of the annular body, and the extension plate is provided with a first shoulder, the first shoulder extending from the inner surface of the extension plate into the avoidance hole; The movable frame comprises: an annular bracket, the annular bracket is annular and movably mounted in the annular body, and the drive motor is mounted in the annular bracket; A first protrusion is connected to the outer side of the annular support and is located on the top surface of the first shoulder.

2. The lens driving mechanism according to claim 1, wherein: The extension plate is rectangular and annular, and the four sides of the extension plate are respectively provided with avoidance grooves, and the avoidance grooves extend from the bottom surface to the top surface of the extension plate; the annular body is provided with four mounting grooves, and the four mounting grooves are respectively connected to the four avoidance grooves; The third plate includes four side circuit boards, the bottom ends of the four side circuit boards are respectively connected to the second plates, and the top ends extend from the four avoidance grooves to the four mounting grooves; the four first coils are respectively electrically connected to the four side circuit boards and are respectively located in the four mounting grooves; the four second magnets are respectively located on the sides of the movable frame and are respectively aligned radially with the four first coils.

3. The lens driving mechanism according to claim 2, wherein: A limiting column is provided at the edge of the extension plate, and the limiting column is located radially outside the first plate.

4. The lens driving mechanism according to claim 2, wherein: The bottom surface of the extension plate is further provided with a groove, which extends along the circumference of the extension plate and is communicated with the avoidance groove, and the second plate is located in the groove.

5. The lens driving mechanism according to claim 1, wherein: The four corners of the outer frame are respectively provided with a first groove body, the first groove body is formed by extending the inner surface of the annular body toward the outside, and the depth of the first groove body along the axial direction gradually decreases from the inside to the outside; The bottom surface of the movable frame is respectively provided with four second grooves, which are respectively recessed from the outer surface of the movable frame toward the interior; the axial depth of the four second grooves is respectively the same as the axial depth of the inner ends of the four first grooves, and the four second grooves are respectively arranged radially opposite to the inner ends of the four first grooves; The four first mounting positions are respectively located on the top walls of the four first slots and at the outer ends of the first slots; the four second mounting positions are respectively located on the top walls of the second slots; the outer ends of the four spring wires are respectively connected to the four first mounting positions, and the inner ends are respectively connected to the four second mounting positions.

6. The lens driving mechanism according to claim 5, wherein: The annular bracket is provided with a second avoidance hole, which extends from the top toward the bottom of the annular bracket and is radially aligned with the first avoidance hole; The circuit board also includes a connecting piece, the outer end of which is electrically connected to the first board, and the inner end of which extends into the annular bracket through the first avoidance hole and the second avoidance hole in sequence. The connecting piece covers the top surface of the first protrusion and is electrically connected to the second coil.

7. The lens driving mechanism according to claim 6, wherein: The inner frame includes: an annular frame, wherein the carrier is installed in the annular frame, A second protrusion is connected to the outer side of the annular frame and radially passes through the second avoidance hole and the first avoidance hole in sequence and extends to the outside of the annular body. The second protrusion is located on the top surface of the connecting piece.

8. The lens driving mechanism according to claim 6, wherein: The inner frame is provided with a built-in circuit, and the built-in circuit is electrically connected to the connecting piece and the second coil.

9. The lens driving mechanism according to claim 1, wherein: A limiting groove is provided on the inner surface of the annular body, the limiting groove is located at a corner of the annular body, and the limiting groove extends from the top surface to the bottom surface of the annular body; A limiting protrusion is provided on the radial outer side of the annular bracket. The limiting protrusion is located in the limiting groove, and the size of the limiting protrusion is smaller than the size of the limiting groove.

10. The lens driving mechanism according to claim 1, wherein: Also includes: a base mounted on the bottom of the outer frame; The shell is connected to the base and covers the outside of the outer frame.

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