CN115808765A - Lens driving mechanism - Google Patents

Abstract

The invention discloses a lens driving mechanism which comprises an outer frame, a movable frame, a driving motor and a first resetting piece. The outer frame is annular and is provided with a circuit board, a first coil and a chip, and the circuit board is connected to the outer frame; the first coil is electrically connected with the circuit board; the chip is electrically connected with the circuit board; the movable frame is annular and can be movably arranged in the outer frame, and is provided with a first magnet; the first reset piece can drive the movable frame to reset; the drive motor is mounted within the mobile frame and includes an inner frame, an inner shell, and a carrier. The inner shell is connected with the inner frame and is provided with a second magnet; the carrier is movably arranged in the inner frame, the carrier is used for mounting the lens, a second coil is wound on the periphery of the carrier, and the second coil is electrically connected with the circuit board and matched with a second magnet to drive the carrier to move along the optical axis direction of the lens; the second resetting piece can be used for operatively driving the carrier to reset; the chip can control the first coil and the second coil to operate.

Description

Lens driving mechanism

Technical Field

The present invention relates to electronic devices, and particularly to a lens driving mechanism.

Background

With the development of electronic technology, portable consumer electronic products are more and more sought after, such as mobile phones, handheld game consoles, and with the development of technology, the use of these electronic devices is more and more common, and the electronic devices are developed towards a convenient and light design direction, so as to provide more choices for users.

In practice, in order to adapt to photographing of various scenes, the lens needs to be continuously focused, and an anti-shake lens needs to be prevented during focusing or photographing. In the prior art, a lens driving mechanism is generally used to drive a lens along an optical axis direction to adjust a focal length, and the lens driving mechanism includes a carrier and a movable frame, wherein the carrier is used to mount the lens, and the carrier can drive the lens to move along the optical axis.

In order to drive the lens to move more quickly, the driving motor needs to be lighter to meet the market demand. In addition, a circuit board is required to be arranged in the lens driving mechanism, and the structure of the circuit board needs to be stably connected with parts of the lens driving mechanism as much as possible, so that the lens driving mechanism with a stable structure needs to be developed.

Disclosure of Invention

The present invention is directed to a lens driving mechanism to solve the above problems.

In order to solve the above technical problem, the present invention provides a lens driving mechanism, including:

the outer frame, the outer frame is cyclic annular and is equipped with:

a circuit board connected to the outer frame;

a first coil electrically connected to the circuit board;

a chip electrically connected with the circuit board;

a movable frame; the movable frame is annular and can be movably arranged in the outer frame, and a first magnet is arranged on the movable frame;

the first reset piece is operable to drive the movable frame to reset; and

a drive motor mounted in the adjustable shelf and including:

an inner frame; the inner frame is annular;

an inner case connected to the inner frame and provided with a second magnet;

the carrier is movably arranged in the inner frame and used for mounting a lens, a second coil is wound on the periphery of the carrier and is electrically connected with the circuit board and matched with the second magnet to drive the carrier to move along the optical axis direction of the lens; and

a second reset member operable to drive the carrier to reset;

wherein the chip may control the first coil and the second coil to operate.

In one embodiment, the outer frame comprises:

the annular main body is rectangular and annular, the movable frame can be movably arranged in the annular main body, and the first coil is arranged in the annular main body; and

the extension plate is annular and sleeved outside the annular main body, and the extension plate extends along the circumferential direction of the annular main body and is positioned at the bottom of the annular main body;

the circuit board includes:

the first plate is positioned on the top surface of the extension plate and extends along the circumferential direction of the extension plate, and the first plate is clamped with the extension plate;

the second plate is positioned at the bottom of the extension plate and extends along the circumferential direction of the extension plate to form a ring shape, and the second plate is electrically connected with the first plate; and

a third plate mounted on the ring body and electrically connected with the second plate and the first coil.

In one embodiment, the extension plate is rectangular ring-shaped, and avoidance grooves are respectively arranged on four side parts of the extension plate and extend from the bottom surface to the top surface of the extension plate; the annular main body is provided with four mounting grooves which are respectively communicated with the four avoiding grooves;

the third plate comprises four side circuit boards, the bottom ends of the four side circuit boards are respectively connected with the second plate, and the top ends of the four side circuit boards respectively extend into the four mounting grooves from the four avoidance grooves; the four first coils are respectively electrically connected with the four side circuit boards and are respectively positioned in the four mounting grooves; the four second magnets are respectively located on the side portion of the movable frame and are respectively aligned with the four first coils in the radial direction.

In one embodiment, the edge of the extension plate is provided with a limiting column, and the limiting column is positioned at the radial outer part of the first plate.

In one embodiment, the bottom surface of the extension plate is further provided with a groove, the groove extends along the circumferential direction of the extension plate and is communicated with the avoidance groove, and the second plate is located in the groove.

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 in the radial direction, and the second mounting positions are deviated towards the top relative to the first mounting positions;

the first reset piece comprises a plurality of spring wires, the outer ends of the plurality of spring wires are respectively connected with the first mounting positions, and the inner ends of the plurality of spring wires are respectively connected with the second mounting positions.

In one embodiment, 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 main body towards the outside, and the depth of the first groove body along the axial direction is gradually reduced from inside to outside;

the bottom surface of the movable frame is respectively provided with four second groove bodies which are respectively formed by inwards sinking from the outer surface of the movable frame; the depth of the four second groove bodies along the axial direction is the same as the depth of the inner ends of the four first groove bodies along the axial direction, and the four second groove bodies are opposite to the inner ends of the four first groove bodies along the radial direction;

the four first mounting positions are respectively positioned on the top walls of the four first tank bodies and at the outer ends of the first tank bodies; the four second mounting positions are respectively positioned on the top wall of the second groove body; the outer ends of the four spring wires are respectively connected with the four first mounting positions, and the inner ends of the four spring wires are respectively connected with the four second mounting positions.

In one embodiment, the annular body is provided with a first avoidance hole extending from a bottom towards a top surface of the annular body, the extension plate is provided with a first shoulder extending into the avoidance hole from an inner surface of the extension plate;

the movable frame includes:

the annular support is annular and can be movably arranged in the annular main body, and the driving motor is arranged in the annular support;

a first protrusion connected to an outer side of the annular bracket and located on a top surface of the first shoulder.

In one embodiment, the annular support is provided with a second avoidance hole extending from the top towards the bottom of the annular support and radially aligned with the first avoidance hole;

the circuit board further comprises a connecting piece, the outer end of the connecting piece is electrically connected with the first board, the inner end of the connecting piece penetrates through the first avoiding hole and the second avoiding hole in sequence and extends into the annular support, and the connecting piece covers the first protruding top face and is electrically connected with the second coil.

In one embodiment, the inner frame comprises:

an annular frame in which the carrier is mounted,

the second protrusion is connected to the outer side of the annular frame and sequentially penetrates in the radial direction through the second avoidance hole and the first avoidance hole and extends to the outside of the annular main body, and the second protrusion is located on the top surface of the connecting piece.

In one embodiment, the inner frame is provided with a built-in circuit electrically connected with the connection pad and the second coil.

In one embodiment, the inner surface of the annular main body is provided with limiting grooves, the limiting grooves are positioned at the corners of the annular main body, and the limiting grooves extend along the top surface to the bottom surface of the annular main body;

the radial outer side of the annular support is provided with a limiting protrusion, the limiting protrusion is located in the limiting groove, and the size of the limiting protrusion is smaller than that of the limiting groove.

In one embodiment, further comprising:

the base is arranged at the bottom of the outer frame;

the shell is connected with the base and covers the outer portion of the outer frame.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 and 2 are exploded views of a lens driving mechanism of an embodiment of the present invention.

Fig. 3 is an assembly view of the base, the outer frame, the circuit board and the first restoring member of the embodiment shown in fig. 1.

Fig. 4 is an assembly view of the circuit board, the movable frame, and the driving motor in the embodiment shown in fig. 1.

Fig. 5 is an exploded view of the movable frame, the first restoring member, the outer frame, and the circuit board in the embodiment shown in fig. 1.

Fig. 6 is an assembly view of the movable frame, the first restoring member, the outer frame and the circuit board in the embodiment shown in fig. 5.

Fig. 7 is an exploded view of the movable frame, the first restoring member and the outer frame in the embodiment of fig. 1.

Fig. 8 is an assembled view of the outer frame, the movable frame, and the first restoring member in the embodiment shown in fig. 1.

Fig. 9 is an assembly view of the circuit board, the movable frame, and the driving motor in the embodiment shown in fig. 1.

Fig. 10 and 11 are exploded views of the driving motor in the embodiment shown in fig. 1.

Reference numerals: 100. a lens driving mechanism; 1. a base; 2. a housing; 3. an outer frame; 31. an annular body; 311. a limiting groove; 312. mounting grooves; 313. a clamping block; 314. a first avoidance hole; 32. an extension plate; 321. an avoidance groove; 322. a groove; 323. a first shoulder; 33. a limiting post; 34. a first coil; 35. a first tank body; 4. a movable frame; 41. an annular support; 42. a limiting bulge; 43. a first magnet; 44. a second avoidance hole; 45. a first protrusion; 46. a second tank body; 47. a second shoulder; 5. a drive motor; 51. an inner frame; 511. an annular frame; 512. a second protrusion; 513. a first projecting portion; 52. an inner shell; 53. a carrier; 54. a reed is arranged; 55. a lower reed; 56. a second magnet; 6. a circuit board; 61. a first plate; 62. a second plate; 63. a third plate; 631. a card slot; 64. a fourth plate; 65. a fifth plate; 66. connecting sheets; 67. a clamping piece; 68. a chip; 69. an imaging chip; 7. a spring wire; 71. and connecting the holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment can be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

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

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

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 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 clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

The present invention relates to a lens driving mechanism 100, and as shown in fig. 1 and 2, the lens driving mechanism 100 includes a base 1, a housing 2, an outer frame 3, a movable frame 4, a driving motor 5, and a first restoring member. Wherein, the base 1 is rectangular plate-shaped, and the shell 2 is connected to the top surface of the base 1, and forms accommodation space with the cooperation of the base 1 for hold outer frame 3, adjustable shelf 4 and driving motor 5.

Specifically, as shown in fig. 2 and 3, the outer frame 3 is rectangular and annular and is mounted on the top surface of the base 1 and is located inside the housing 2, and the outer frame 3 is fixedly connected to the base 1. The outer frame 3 includes an annular main body 31, an extension plate 32, and three position-limiting posts 33 located on the top surface of the extension plate 32, wherein the annular main body 31 is rectangular and annular and has four side portions, and the annular main body 31 is mounted on the top surface of the base 1. The extension plate 32 is also rectangular ring-shaped and is sleeved outside the ring-shaped main body 31, the extension plate 32 is located on the bottom surface of the ring-shaped main body 31, and the bottom surface of the extension plate 32 is flush with the bottom surface of the ring-shaped main body 31. The three limiting columns 33 are respectively located at three corners of the extending plate 32, and are arranged at intervals with the annular main body 31.

The movable frame 4 is movably arranged in the outer frame 3. Specifically, as shown in fig. 4, 5 and 6, the movable frame 4 includes a ring-shaped holder 41 having a rectangular ring shape and located inside the ring-shaped main body 31, and two limit protrusions 42, the ring-shaped holder 41 being spaced apart from the inner surface of the ring-shaped main body 31 so as to allow the ring-shaped holder 41 to move inside the ring-shaped main body 31. The limiting protrusions 42 are located on the outer surface of the annular support and located at a pair of diagonal positions of the annular support respectively, and the limiting protrusions 42 extend from the top surface to the bottom surface of the annular support. The inner surface of the annular main body 31 is provided with two limiting grooves 311, the two limiting grooves 311 are located at opposite corners of the annular main body 31 corresponding to the two limiting protrusions 42 and extend from the top surface to the bottom surface of the annular main body 31, and the two limiting grooves 311 respectively accommodate the two limiting protrusions 42. In addition, the shape of the limiting groove 311 is matched with that of the limiting protrusion 42, and the size of the limiting groove 311 in the axial direction, the circumferential direction and the radial direction is all larger than that of the limiting protrusion 42, that is, the two limiting grooves 311 can allow the two limiting protrusions 42 to move in the limiting groove and can limit the rotation amplitude of the limiting protrusion 42 to a certain extent.

The four side portions of the annular bracket 41 are respectively provided with the first magnets 43, the four first magnets 43 are respectively embedded in the annular bracket, no additional space is occupied, the four side portions of the annular main body 31 are respectively provided with the first coils 34, and the four first coils 34 are respectively matched with the four first magnets 43 to drive the movable frame 4 to move.

The four first coils 34 are electrically connected to the circuit board 6. The circuit board 6 includes a first plate 61, a second plate 62, a third plate 63, a fourth plate 64 and a fifth plate 65, wherein the first plate 61 is annularly sleeved outside the annular main body 31 and is overlapped on the top surface of the extension plate 32, the first plate 61 is located at the radial inner side of the three spacing columns 33 and is provided with a connecting hole with the extension plate 32, and the connecting column on the top surface of the extension plate sleeved with the connecting hole can enhance the connection stability of the first plate 51 and the extension plate 32. In addition, the first plate 51 may be clamped with the extension plate 32 in other manners, and the specific manner of clamping is not limited.

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

In order to facilitate the electrical connection between the second board 62 and the third board 63, four parts of the extension board 32 are respectively provided with four avoiding grooves 321, the avoiding grooves 321 extend from the bottom surface to the top surface of the extension board 32, and the positions and shapes of the four avoiding grooves 321 can be set according to the shape requirements of the four side circuit boards without limiting the specific shapes of the avoiding grooves 321. In addition, four side portions of the ring-shaped body 31 are respectively installed in the grooves 312, the four installation grooves 312 extend from the outer surface toward the inner surface of the ring-shaped body 31, and the bottoms of the four installation grooves 312 are respectively connected with the four escape grooves 321. The bottoms of the four side circuit boards of the third board 63 are respectively located in the four avoidance grooves 321 and are electrically connected to the second board 62; the top portion extends from the escape groove 321 into the mounting groove 312, and the four first coils 34 are connected to the inner surfaces of the four side circuit boards, respectively, and are located in the mounting groove 312.

The inner surface of the mounting groove 312 is further provided with two or more clamping blocks 313, and the lateral circuit board is provided with a plurality of clamping grooves 631 clamped in the clamping blocks 313 respectively, so that the connection strength of the four lateral circuit boards in the mounting groove 312 is increased, and the lateral circuit boards are conveniently positioned and assembled in the mounting groove 312. The bottom surface of extension board is equipped with recess 322, and this recess 322 just runs through four dodge grooves 321 along the circumference extension of extension board, is convenient for hold second board 62, and second board 62 is installed in recess 322, can strengthen second board 62 and extend the stability between the board, can reduce the space that occupies moreover.

The fourth plate 64 of the circuit board 6 is a substantially rectangular plate and substantially parallel to the third plate 63, and the fourth plate 64 is located outside the circuit board on 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 sheet of the bit plane of the original state of the circuit board 6 needs to be bent according to the circuit trend to be in a preset state, but the bent part is easily affected by original stress, that is, the bent part has a force toward the original state, and the stress can make the bent part move toward the original state, which causes instability of the circuit board 6. The circuit board 6 is electrically connected to the coil and the respective chips 68, and the positional state of the coil is affected. In the circuit board 6 of the present invention, the fourth plate 64 to be bent is connected to the first plate 61 and the second plate 62 by welding, so as to avoid the problem of being affected by stress, and further ensure the relative stability of the circuit board 6 and the outer frame 3.

The fifth plate 65 is connected to the first plate 61 and extends away from the first plate 61 towards the exterior of the housing 2, facilitating electrical connection to an external power source.

Further, one corner portion of the ring-shaped bracket is further provided with a first avoidance hole 314, as shown in fig. 2 and 6, the first avoidance hole 314 extending from the top surface toward the bottom surface of the ring-shaped bracket, and the extension plate is provided with a first shoulder 323 at a position radially corresponding to the first avoidance hole 314, the first shoulder 323 extending from the inner surface toward the inner surface of the extension plate and being located within the first avoidance hole 314. The outer surface of the annular support 41 is provided with a first projection 45, the first projection 45 is aligned with the first avoidance hole 314 and the first shoulder 323 in the radial direction and is overlapped on the top surface of the first shoulder 323, and the first projection 45 is overlapped on the top surface of the first shoulder 323 and is positioned in the first avoidance hole 314.

The annular bracket 41 is provided with second avoidance holes 44 at positions corresponding to the first avoidance holes 314 in the radial direction, and the second avoidance holes 44 extend from the top surface of the annular bracket 41 toward the bottom to the positions of the first protrusions 45.

The circuit board 6 further includes a connecting piece 66, an outer end of the connecting piece 66 is connected with a corner of the first plate 61 corresponding to the first avoiding hole 314, and is overlapped on the top surface of the first protrusion 45; the inner end extends to the inside of the ring bracket 41 through the first and second relief holes 314 and 44. And is electrically connected to an imaging chip 69 located at the bottom of the ring support.

The movable frame 4 is restored to the original state through the first restoring piece after moving. Specifically, four corners of the outer frame 3 are respectively provided with first grooves 35, as shown in fig. 7 and 8, the first grooves 35 are located on the bottom surface of the outer frame 3 and extend from the inner surface of the annular main body 31 to the extension plate towards the outside, that is, the first grooves 35 extend from the bottom surface of the annular main body 31 to the bottom surface of the extension plate, the depth of the first grooves 35 in the axial direction gradually increases from the inside to the outside, and top walls of the outer ends of the four first grooves 35 are first mounting positions for connecting one end portion of the first restoring member. The annular bracket 41 is provided at four corners thereof with second grooves 46, and the second grooves 46 are located at the bottom surface of the annular bracket 41 and extend from the outer surface of the annular bracket 41 toward the inside. The four second grooves 46 are aligned with the four first grooves 35 in the radial direction, respectively, and the depth of the four second grooves 46 in the axial direction is substantially the same as the depth of the four first grooves 35 in the axial direction at the inner ends, but is greater than the depth of the four first grooves 35 at the outer ends. The top wall of the second groove 46 is a second mounting position for connecting the other end of the first restoring member.

Specifically, the first reset piece includes four spring wires 7, and the outer end and the inner end of four spring wires 7 are equipped with connecting hole 71 respectively, and the first installation position is equipped with the spliced pole that is located the connecting hole 71 of spring wire 7 outer end. The four spring wires 7 are connected with the first mounting position through the matching of the connecting holes 71 and the connecting columns. The second mounting positions are respectively provided with connecting columns of connecting holes 71 positioned at the inner ends of the spring wires 7, and the inner ends of the four spring wires 7 are respectively connected with the second mounting positions of the four second groove bodies 46.

Since the top wall of the second groove 46 is offset more toward the top than the top wall of the outer end of the first groove 35, and the four spring wires 7 are thereby caused to assume an inclined state, i.e., the outer ends of the four spring wires 7 are offset toward the bottom and the inner ends are offset toward the top, the four spring wires 7 exert a force on the annular bracket 41 that moves toward the bottom.

In practice, the movable frame 4 can be rocked or moved axially within the annular body 31 to adjust the focal length or to prevent shaking. For example, the first magnet 43 and the first coil 34 cooperate to drive the movable frame 4 to be raised on one side or to be raised at one corner. The two spring wires 7 at the bottom of the ascending side are stretched, the two stretched spring wires 7 exert a downward moving force on the ascending side of the movable frame 4, the other two spring wires 7 also have a downward moving force on the movable frame 4, and the four spring wires 7 cooperate to drive the movable frame 4 to return to the original state. Four spring wires 7 all exert the power of moving towards the bottom to adjustable shelf 4, and four spring wires 7 are the same shape moreover, and elasticity is unanimous, can be to adjustable shelf 4 even application of force to make adjustable shelf 4 steady motion and stable the resetting.

It should be understood that the number of the spring wires 7 is not limited, two, three, six, etc. may be provided, and the shape of the spring wires 7 is not limited, so as to meet the requirement of elasticity. The number of the first installation positions and the second installation positions is not limited, the first installation positions can be connected with the outer ends of the multiple spring wires 7, the second installation positions can be connected with the inner ends of the multiple spring wires 7, and the matching of the spring wires 7 and the first installation positions and the second installation positions is not limited. In addition, the first slot 35 may be disposed on four side portions of the outer frame 3, and the second slot 46 may be disposed on four side portions of the movable frame 4 and aligned with the four first slots 35 in the radial direction, without limiting specific positions of the first slot 35 and the second slot 46.

The driving motor 5 is installed inside the annular bracket 41 and is fixedly connected with the annular bracket 41. In the embodiment shown in fig. 6, the inner surface of the annular bracket 41 is provided with three second shoulders 47, and the three second shoulders 47 are respectively located at three corners of the annular bracket 41, that is, the three second shoulders 47 and the second avoidance hole 44 are respectively located at four corners of the annular bracket 41.

The drive motor 5 includes an inner frame 51, an inner housing 52, a carrier 53, and a second returning member. As shown in fig. 10 and 11, the inner frame 51 is ring-shaped and is mounted in the ring bracket 41, the inner frame 51 includes a ring-shaped frame 511, a second protrusion 512 connected to an outer surface of the ring-shaped frame 511, and three first protrusions 513, the ring-shaped frame 511 is ring-shaped and is located in the ring bracket 41, the three first protrusions 513 are located at three corners of the ring-shaped frame 511 and abut against top surfaces of the three second shoulders 47, respectively, so that the inner frame 51 is stably mounted in the ring bracket 41.

The second protrusion 512 is shaped like a sheet and is located at the other corner of the annular frame 511, and as shown in fig. 9, the second protrusion 512 is located at a corner corresponding to the first and second avoiding holes 314 and 44 and extends from the outer surface of the annular frame 511 toward the outside in the radial direction. The second protrusion 512 penetrates through the second escape hole 44 and the first escape 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 piece 66 and on the bottom of the first plate 61, i.e. the second protrusion 512 is supported by the connecting piece 66 and the first plate 61 and is electrically connected to the first plate 61 or the connecting piece 66.

Specifically, the inner frame 51 is provided with a built-in circuit that may extend into the second protrusion 512. The second protrusion 512 may be electrically connected to the connection pad 66 or the first board 61, thereby electrically connecting the built-in circuit to the circuit board 6. In addition, in order to enhance 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, the clamping piece 67 extends from the inner side of the first plate 61 toward the inside and covers to the top of the second protrusion 512, and the second protrusion 512 is supported by the clamping piece 67 and the connection 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 positioned in the connecting hole, so that the second protrusion 512 is further ensured to be stably connected with the circuit board 6.

The inner shell 52 is a rectangular shell and is connected to the top of the inner frame 51, and the inner shell 52 and the outer frame 3 are fixedly connected, without limiting the specific connection of the inner shell 52 and the outer frame 3, including but not limited to snapping, screwing, bonding or other means. Further, the inner case 52 is provided with a plurality of second magnets 56, and the plurality of second magnets 56 are fixedly attached to the inner surface of the inner case 52.

The carrier 53 is movably installed in the annular frame 511 and is provided with a second coil, a lens is installed in the carrier 53, and the second coil and the second magnet 56 are matched to drive the carrier 53 to move along the optical axis direction of the lens, so that the focal length of the lens is adjusted.

The second reset member comprises an upper spring 54 and a lower spring 55, the carrier 53 is elastically connected with the inner shell 52 and the inner frame 51 through the upper spring 54 and the lower spring 55, and the upper spring 54 and the lower spring 55 have elasticity and can drive the carrier 53 to reset. Specifically, the upper spring 54 has one end connected to the inner surface of the inner case 52 and the other end connected to the top of the carrier 53. The lower spring 55 is attached to the top of the carrier 53 and the other end is attached to the inner frame 51, and the upper spring 54 and the lower spring 55 cooperate to resiliently connect the carrier 53 to the housing and the inner frame 51.

The lower spring 55 is a conductive metal piece, and one end of the lower spring 55 is electrically connected to the second coil of the carrier 53, and the other end is electrically connected to the built-in circuit in the inner frame 51, that is, a current can flow from the circuit board 6, the built-in circuit in the inner frame 51, and the lower spring 55 to the second coil.

The circuit board 6 is further provided with a chip 68, the chip 68 is located on the top surface of the first plate 61 and electrically connected to the first plate 61, and 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, and the chip 68 of the present invention is located outside the driving motor 5, so that the internal space of the driving motor 5 can be reduced, and the driving motor 5 is lighter, so that the carrier 53 and the lens can be driven to move more easily, and market demands can be met.

While the 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 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 for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (13)

1. A lens driving mechanism, comprising:

the outer frame, the outer frame is cyclic annular and is equipped with:

a circuit board connected to the outer frame;

a first coil electrically connected to the circuit board;

a chip electrically connected with the circuit board;

a movable frame; the movable frame is annular and can be movably arranged in the outer frame, and the movable frame is provided with a first magnet; the first reset piece is operable to drive the movable frame to reset; and

a drive motor mounted in the adjustable shelf and including:

an inner frame; the inner frame is annular;

an inner shell connected with the inner frame and provided with a second magnet;

the carrier is movably arranged in the inner frame and used for mounting a lens, a second coil is wound on the periphery of the carrier and is electrically connected with the circuit board and matched with the second magnet to drive the carrier to move along the optical axis direction of the lens; and

a second reset member operable to drive the carrier to reset;

wherein the chip can control the first coil and the second coil to operate.

2. The lens driving mechanism according to claim 1,

the outer frame includes:

the annular main body is rectangular and annular, the movable frame is movably arranged in the annular main body, and the first coil is arranged in the annular main body; and

the extension plate is annular and sleeved outside the annular main body, and the extension plate extends along the circumferential direction of the annular main body and is positioned at the bottom of the annular main body;

the circuit board includes:

the first plate is positioned on the top surface of the extension plate and extends along the circumferential direction of the extension plate, and the first plate is clamped with the extension plate;

the second plate is positioned at the bottom of the extension plate and extends along the circumferential direction of the extension plate to form a ring shape, and the second plate is electrically connected with the first plate; and

a third plate mounted on the annular body and electrically connected with the second plate and the first coil.

3. The lens driving mechanism according to claim 2, wherein the extension plate has a rectangular ring shape, and the extension plate is provided with an avoiding groove at each of four side portions thereof, the avoiding groove extending from a bottom surface to a top surface of the extension plate; the annular main body is provided with four mounting grooves which are respectively communicated with the four avoiding grooves;

the third plate comprises four side circuit boards, the bottom ends of the four side circuit boards are respectively connected with the second plate, and the top ends of the four side circuit boards respectively extend into the four mounting grooves from the four avoidance grooves; the four first coils are respectively and electrically connected with the four side circuit boards and are respectively positioned in the four mounting grooves; the four second magnets are respectively located on the side portion of the movable frame and are respectively aligned with the four first coils in the radial direction.

4. A lens driving mechanism according to claim 3, wherein a stopper post is provided at an edge of the extension plate, the stopper post being located radially outward of the first plate.

5. The lens driving mechanism according to claim 3, wherein a groove is further provided in a bottom surface of the extension plate, the groove extending in a circumferential direction of the extension plate and communicating with the escape groove, and the second plate is located in the groove.

6. The lens driving mechanism according to claim 2, wherein a bottom portion of the outer frame is provided with a plurality of first mounting locations, a bottom portion of the movable frame is provided with a plurality of second mounting locations, the plurality of second mounting locations are respectively aligned with the plurality of first mounting locations in a radial direction, and the second mounting locations are offset toward a top with respect to the first mounting locations;

the first reset piece comprises a plurality of spring wires, the outer ends of the plurality of spring wires are connected with the first mounting positions respectively, and the inner ends of the plurality of spring wires are connected with the second mounting positions respectively.

7. The lens driving mechanism according to claim 6, wherein the four corners of the outer frame are respectively provided with a first groove, the first grooves are formed by extending the inner surface of the annular main body toward the outside, and the depth of the first grooves in the axial direction is gradually reduced from the inside to the outside;

the bottom surface of the movable frame is respectively provided with four second groove bodies which are respectively formed by inwards sinking from the outer surface of the movable frame; the depth of the four second groove bodies along the axial direction is the same as the depth of the inner ends of the four first groove bodies along the axial direction, and the four second groove bodies are opposite to the inner ends of the four first groove bodies along the radial direction;

the four first installation positions are respectively positioned on the top walls of the four first tank bodies and at the outer ends of the first tank bodies; the four second mounting positions are respectively positioned on the top wall of the second groove body; the outer ends of the four spring wires are respectively connected with the four first mounting positions, and the inner ends of the four spring wires are respectively connected with the four second mounting positions.

8. The lens driving mechanism according to claim 2, wherein the annular main body is provided with a first avoidance hole extending from a bottom toward a top surface of the annular main body, the extension plate is provided with a first shoulder extending from an inner surface of the extension plate into the avoidance hole;

the movable frame includes:

the annular support is annular and can be movably arranged in the annular main body, and the driving motor is arranged in the annular support;

a first protrusion connected to an outer side of the annular bracket and located on a top surface of the first shoulder.

9. The lens driving mechanism according to claim 8, wherein the annular holder is provided with a second avoidance hole extending from a top toward a bottom of the annular holder and radially aligned with the first avoidance hole;

the circuit board further comprises a connecting piece, the outer end of the connecting piece is electrically connected with the first board, the inner end of the connecting piece penetrates through the first avoiding hole and the second avoiding hole in sequence and extends into the annular support, and the connecting piece covers the first raised top surface and is electrically connected with the second coil.

10. The lens driving mechanism according to claim 9, wherein the inner frame comprises:

an annular frame within which the carrier is mounted,

the second protrusion is connected to the outer side of the annular frame and sequentially penetrates in the radial direction through the second avoidance hole and the first avoidance hole and extends to the outside of the annular main body, and the second protrusion is located on the top surface of the connecting piece.

11. A lens driving mechanism according to claim 2, wherein the inner frame is provided with a built-in circuit electrically connected to the connecting piece and the second coil.

12. The lens driving mechanism according to claim 8, wherein the inner surface of the ring body is provided with a stopper groove at a corner of the ring body, the stopper groove extending along a top surface to a bottom surface of the ring body;

the radial outer side of the annular support is provided with a limiting protrusion, the limiting protrusion is located in the limiting groove, and the size of the limiting protrusion is smaller than that of the limiting groove.

13. The lens driving mechanism according to claim 1, further comprising:

the base is arranged at the bottom of the outer frame;

the shell is connected with the base and covers the outer portion of the outer frame.

Images