Lens driving mechanism

Abstract

The present invention discloses a lens driving mechanism, including a housing, a base, a carrier, a magnetic element, a coil assembly, a circuit board and a lower spring piece. The carrier is used for mounting a lens. The coil assembly is mounted on opposite sides of the carrier. The magnetic element is mounted on the base and cooperates with the coil assembly. The lower spring piece movably connects the carrier to the base. The circuit board is disposed on the base and faces one side portion of the carrier. Wherein, the lower spring piece electrically connects the circuit board to the coil assembly.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and particularly to a lens driving mechanism. Background Art

[0002] With the development of technology, many current electronic devices (such as smart phones or digital cameras) have the function of taking pictures or videos. The use of these electronic devices is becoming more and more common, and they are developing towards a convenient, thin and light design direction to provide users with more choices. However, the lens driving mechanisms on the existing market involve too many parts, have a complex installation process, are difficult to assemble, have a low yield rate, and poor reliability.

[0003] Therefore, a driving device, which has the advantages of small size and simple structure, has become the research and development direction of industry players. Summary of the Invention

[0004] The purpose of the present invention is to provide a lens driving mechanism to solve the problems existing in the above-mentioned prior art.

[0005] To solve the above problems, according to one aspect of the present invention, a lens driving mechanism is provided. The lens driving mechanism includes a housing, a base, a carrier, a magnetic element, a coil assembly, a circuit board and a lower spring piece. The carrier is used for mounting a lens. The coil assemblies are mounted on opposite sides of the carrier. The magnetic element is mounted on the base and cooperates with the coil assemblies. The lower spring piece movably connects the carrier and the base. The circuit board is disposed on the base and faces one side portion of the carrier. Wherein, the lower spring piece electrically connects the circuit board and the coil assemblies.

[0006] In one embodiment, the base includes a bottom plate and a mounting plate extending upward from the bottom plate by a certain distance. The circuit board is mounted on the mounting plate.

[0007] In one embodiment, the circuit board has an inner surface facing the carrier. Sensors and capacitors are provided on the inner surface. The mounting plate is provided with a sensor avoidance opening for avoiding the sensors and a capacitor avoidance opening for avoiding the capacitors.

[0008] In one embodiment, the side portion of the carrier corresponding to the circuit board is further provided with a wire winding post and a sensor magnet mounting hole. The sensor magnet mounting hole and the wire winding post are respectively located at both ends of this side portion.

[0009] In one embodiment, a lens mounting hole is provided in the middle of the carrier for mounting a lens. A first side portion, a second side portion, a third side portion, and a fourth side portion of the carrier are sequentially formed around the lens mounting hole. The first side portion and the third side portion are oppositely arranged and are used for mounting the coil assembly, and the second side portion corresponds to the circuit board and is provided with a sensor magnet mounting groove.

[0010] In one embodiment, the winding posts include a first winding post provided on the second side portion and a second winding post provided on the fourth side portion. The coil assembly includes a first coil mounted on the first side portion and a second coil mounted on the third side portion. The end of the first coil is wound around the first winding post, and the end of the second coil is wound around the second winding post.

[0011] In one embodiment, the lower spring piece includes two independent parts. Each part includes at least two base connection parts and at least two carrier connection parts. One of the base connection parts includes a notch, a base fixing piece and a circuit board connection part respectively provided on both sides of the notch. The circuit board connection part is electrically connected to the circuit board, and the base fixing piece is fixedly connected to the base.

[0012] In one embodiment, support posts are provided at the four corners of the base, and the notch of the lower spring piece cooperates with the support posts.

[0013] In one embodiment, a base-embedded metal piece is provided in the base. The base-embedded metal piece includes a contact piece. The bottom plate is provided with a contact piece hole. The contact piece is located in the contact piece hole. When the lower spring piece is mounted on the base, the circuit board connection part contacts the contact piece.

[0014] In one embodiment, the lens driving mechanism further includes a housing. The top of the housing is provided with a top opening for cooperating with the lens. A plurality of bending parts are provided around the top opening, and the carrier is provided with a straight groove surrounding the lens mounting hole and extending along the optical axis direction. The bending parts extend into the straight groove.

[0015] In one embodiment, the lens driving mechanism further includes an upper spring piece. The upper spring piece includes an outer ring for fixedly connecting with the housing and an inner ring for connecting with the upper surface of the carrier. The outer ring and the inner ring are connected by an elastic strip.

[0016] In one embodiment, the lens driving mechanism further includes a frame. The frame is of a rectangular frame structure and is arranged between the upper spring piece and the housing. At least two overflow holes are provided at each corner of the frame for overflowing glue.

[0017] In one embodiment, sinking portions are provided at four corners of the upper surface of the housing, and the outer ring of the upper spring piece is fixedly connected to the lower surface of the sinking portion through the frame.

[0018] In one embodiment, the base further includes a baffle, and the baffle is disposed on opposite side portions of the mounting plate.

[0019] In one embodiment, the housing forms a rectangular structure and has an open space at the lower part to accommodate the carrier and cooperate with the base. The top of the housing is provided with a top opening to cooperate with the lens. A plurality of bending portions extending in the vertical direction are provided around the top opening, and the plurality of bending portions cooperate with the straight grooves on the carrier.

[0020] In one embodiment, housing sinking portions are provided at four corners of the top surface of the housing, and the housing sinking portions cooperate with support columns provided at four corners of the base.

[0021] In one embodiment, the housing sinking portion forms a substantially triangular structure and has a bottom surface parallel to the upper surface of the housing and side surfaces perpendicular to the bottom surface. Protruding portions protrude integrally outward on the side surfaces.

[0022] In one embodiment, the bending portions are disposed inside the sinking portions and are integrally bent and extended downward from the inner edge of the top opening.

[0023] In one embodiment, the width of one end of the bending portion close to the top opening is smaller, and the width of the other end of the bending portion far from the top opening is larger.

[0024] In one embodiment, the housing has a first side portion, a second side portion, a third side portion, and a fourth side portion. The first side portion is the motor output side, which cooperates with the first side portion of the base and is provided with a buckle at the bottom of one end close to the fourth side portion of the housing. The buckle bends from the outside to the inside to fix the base.

[0025] In one embodiment, two downwardly protruding portions are further provided at the bottom of the first side portion, and the two protruding portions are provided close to both ends of the first side portion to cooperate with notches on the first side portion of the base.

[0026] In one embodiment, the second side portion of the housing is the circuit board mounting side and is used to cooperate with the second side portion on the base. A notch is provided at the bottom of the second side portion of the housing, and the notch cooperates with the circuit board interface of the metal sheet embedded in the base.

[0027] In one embodiment, the third side portion of the housing is disposed opposite to the first side portion of the housing, and a protruding portion integrally extends downward from the bottom of the third side portion of the housing. The protruding portion occupies a relatively large area at the bottom, and the fourth side portion corresponds to a baffle on the base and is provided with two protruding blocks at the bottom to cooperate with corresponding structures on the base.

[0028] In one embodiment, a frame is further provided inside the housing. Four corner portions of the frame cooperate with the sunken portion of the housing, and the upper spring piece of the lens driving mechanism is fixedly connected to the housing.

[0029] In one embodiment, the carrier is used for mounting a lens and has an upper surface of the carrier facing the housing and a lower surface of the carrier facing the base. The upper surface of the carrier is provided with a plurality of upper spring piece connection portions, and straight grooves are provided adjacent to the upper spring piece connection portions. The straight grooves extend from the upper surface of the carrier to the lower surface of the carrier and cooperate with the bent portion of the housing.

[0030] In one embodiment, a lens mounting hole is provided in the middle of the carrier to mount the lens. A first side portion, a second side portion, a third side portion, and a fourth side portion of the carrier are formed around the lens mounting hole. The first side portion and the third side portion of the carrier are oppositely arranged and are respectively provided with a first coil mounting portion and a second coil mounting portion to mount the first coil and the second coil of the lens driving mechanism.

[0031] In one embodiment, the coil mounting portion includes a plurality of protrusions integrally protruding outward from the first side portion and the third side portion. The first coil and the second coil are wound around the plurality of protrusions.

[0032] In one embodiment, the second side portion corresponds to the circuit board and is provided with a sensor magnet mounting groove to mount the sensor magnet of the lens driving mechanism.

[0033] In one embodiment, the second side portion is further provided with a first wire winding post. The sensor magnet mounting groove and the first wire winding post are respectively disposed at two ends of the second side portion. The first wire winding post is disposed at one end close to the first side portion to fix the end of the first coil, and the sensor magnet mounting groove is disposed at one end close to the third side portion.

[0034] In one embodiment, the fourth side portion of the carrier is opposite to the second side portion of the carrier and cooperates with the baffle on the base. A second wire winding post is provided at one end of the fourth side portion close to the third side portion, and the end of the second coil is fixed to the second wire winding post.

[0035] In one embodiment, a plurality of lower reed fixing posts are provided on the lower surface of the carrier to connect with the inner ring of the lower reed of the lens driving mechanism.

[0036] In one embodiment, one of the lower reed fixing posts is disposed adjacent to the first winding post, and the other lower reed fixing post is disposed adjacent to the second winding post.

[0037] In one embodiment, an upper surface protrusion is further provided on the upper surface of the carrier, and the upper surface protrusion and the upper reed fixing portion are respectively disposed on both sides of the straight groove.

[0038] In one embodiment, a carrier sinking portion is further provided on the upper surface of the carrier, and the carrier sinking portion is disposed outside the straight groove.

[0039] In one embodiment, the base includes a bottom plate, the bottom plate forms a rectangular structure and forms an opening in the middle to cooperate with the lens mounting hole of the carrier. Support columns are formed at the four corners of the bottom plate, and the support columns extend upward from the bottom plate by a certain distance. An installation plate is provided on one side of the bottom plate, and the installation plate extends upward from the bottom plate by a certain distance, and the circuit board is mounted on the installation plate.

[0040] In one embodiment, a notch is formed on the outer side of the support column for mounting the housing, and a damping rubber groove is formed on the inner side of the support column for accommodating damping rubber.

[0041] In one embodiment, a stepped portion is formed on the inner side of the support column, and the upper surface of the stepped portion is recessed downward to form the damping rubber groove.

[0042] In one embodiment, two damping rubber grooves are formed on the stepped portion, and each damping rubber groove is an arc-shaped groove.

[0043] In one embodiment, the base surrounds the opening to form a first side portion, a second side portion, a third side portion, and a fourth side portion of the base. The first side portion and the third side portion of the base are respectively used for mounting a first magnetic element and a second magnetic element. The second side portion is provided with the installation plate, and the fourth side portion is opposite to the second side portion and is provided with a baffle.

[0044] In one embodiment, reed fixing posts are provided at both ends of the first side portion and the fourth side portion of the base, and positioning holes are provided adjacent to the reed fixing posts. Preferably, one positioning hole is provided on each of the inner and outer sides of the reed fixing post.

[0045] In one embodiment, one end of the mounting plate close to the first side is provided with a capacitor avoidance opening to cooperate with the capacitor on the circuit board, and one end of the mounting plate close to the third side is provided with a sensor avoidance opening to cooperate with the sensor on the circuit board.

[0046] In one embodiment, a circuit board positioning post is provided in the middle of the mounting plate, and the positioning hole of the circuit board corresponds to and cooperates with the circuit board positioning post to fixedly mount the circuit board on the mounting plate. In one embodiment, a groove extending from top to bottom is formed in the middle of the mounting plate, and the circuit board positioning post is arranged in the groove.

[0047] In one embodiment, the capacitor avoidance opening extends from the top to the bottom of the mounting plate and forms an opening above, and / or an arc-shaped side wall is formed on the side wall of the capacitor avoidance opening close to the mounting plate.

[0048] In one embodiment, the base is further provided with a base-embedded metal sheet, the base-embedded metal sheet includes a contact piece, and contact holes are further provided at both ends of the second side, and the contact piece is arranged in the contact holes; preferably, the contact holes are arranged adjacent to one of the support columns.

[0049] In one embodiment, the base-embedded metal sheet has an annular body, an access end and a circuit board connection end are respectively provided on two adjacent sides of the annular body, the circuit board connection end includes a plurality of protruding pieces, and a plurality of openings for cooperating with the plurality of protruding pieces are provided at the bottom of the circuit board.

[0050] In one embodiment, the contact piece is arranged at both ends of the side of the base-embedded metal sheet where the plurality of protruding pieces are provided.

[0051] Compared with the traditional drive module, the lens driving mechanism of the present invention has the advantages of small volume, low power consumption, accurate displacement and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is an exploded perspective view of a lens driving mechanism according to an embodiment of the present invention;

[0053] Figure 2 is a perspective view of a housing according to an embodiment of the present invention;

[0054] Figures 3 - 6 are respectively Figure 2 front views of different sides of the housing;

[0055] Figure 7 is a top view of an upper spring piece according to an embodiment of the present invention;

[0056] Figures 8 - 9They are perspective views of different perspectives of a carrier according to an embodiment of the present invention;

[0057] Figure 10 It is a perspective view of a lower leaf spring according to an embodiment of the present invention;

[0058] Figure 11 It is a perspective view of a base according to an embodiment of the present invention;

[0059] Figure 12 It is a perspective view of a metal sheet embedded in the base according to an embodiment of the present invention;

[0060] Figure 13 It is a perspective view of a component in which a circuit board is combined with the metal sheet embedded in the base;

[0061] Figure 14 It is a cross-sectional view of a lens driving mechanism according to an embodiment of the present invention; and

[0062] Figure 15 It is another cross-sectional view of a lens driving mechanism according to an embodiment of the present invention, in which the housing has been removed. Detailed Description of the Embodiment

[0063] The following will describe the preferred embodiments of the present invention in detail with reference to the accompanying drawings so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0064] In the following description, for the purpose of illustrating various disclosed embodiments, certain specific details are set forth to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0065] References to "an embodiment" or "an embodiment" throughout the specification mean that the particular features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment. Thus, the appearances of "in an embodiment" or "in an embodiment" throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0066] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, words such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0067] Figure 1 is an exploded perspective view of the lens driving mechanism 100 according to an embodiment of the present invention. As Figure 1 shown, the lens driving mechanism 100 generally includes a housing 10, a frame 20, an upper spring piece 30, a carrier 40, a lower spring piece 50, a base 60, a base-embedded metal sheet 70, a first coil 81, a first magnet 82, a second coil 83, a second magnet 84, a circuit board 91, a sensor magnet 92, and a sensor magnet gasket 93. The first magnet 82 and the second magnet 84 are fixedly installed on opposite sides of the base 60. The first coil 81 and the second coil 83 are respectively installed on opposite sides of the carrier 40 and correspond to the first magnet 81 and the second magnet 84 fixedly installed on the base 60. The sensor magnet 92 and the sensor magnet gasket 93 are installed on one side of the carrier 40 where the first coil 81 and the second coil 83 are not installed. The circuit board 91 is installed on one side of the base 40 where the first magnet 82 and the second magnet 84 are not installed and corresponds to the side of the carrier 40 where the sensor magnet is installed.

[0068] The circuit board 91 is provided with a sensor, and the sensor corresponds to the sensor magnet 92. The base-embedded metal sheet 70 is installed in the base 60 and is electrically connected to the circuit board 91. The circuit board 91 is electrically connected to the first coil 81 and the second coil 82. The upper spring piece 30 movably connects the carrier 40 to the housing 10, and the lower spring piece 50 movably connects the carrier 40 to the base 60. The frame 20 is disposed between the upper spring piece 30 and the housing 10. The frame 20, the upper spring piece 30, the carrier 40, the lower spring piece 50, the first coil 81, the first magnet 82, the second coil 83, the second magnet 84, the circuit board 91, the sensor magnet 92, and the sensor magnet gasket 93 are integrally installed in the space defined by the base 60 and the housing 10. Current enters the circuit board 91 through the base-embedded metal sheet 70 and then enters the first coil 81 and the second coil 83 through the circuit board 91. The energized first coil 81 and second coil 83 are subjected to the magnetic force in the magnetic fields generated by the first magnet 82 and the second magnet 84, thereby driving the carrier 40 to move along the optical axis direction. By changing or adjusting the current direction or current magnitude in the first coil 81 and the second coil 83, the movement rhythm and direction of the carrier 40 along the optical axis direction can be controlled.

[0069] Next, each component of the Figure 1 shown lens driving mechanism 100 will be described in detail with reference to the accompanying drawings.

[0070] Figure 2 is a perspective view of the housing 10. As Figure 2As shown, the housing 10 generally forms a rectangular structure and has an open space at the lower part to accommodate components such as the carrier 40 and cooperate with the base 60. The top of the housing 10 is provided with a top opening 11 to cooperate with a lens (not shown in the figure). A plurality of bending portions 12 are provided around the top opening 11, and the plurality of bending portions 12 cooperate with the straight grooves on the carrier 40 to enhance the connection between the housing 10 and the carrier 40. Four corner portions of the top surface of the housing 10 are provided with housing sinking portions 13, and the housing sinking portions 13 cooperate with the support columns 63 at the four corners of the base 60.

[0071] In one embodiment, the housing sinking portion 13 is generally a triangular structure and has a bottom surface 131 substantially parallel to the upper surface of the housing 10. On the side surface substantially perpendicular to the bottom surface 131, a protruding portion 132 protrudes integrally outward, and a concave portion 133 is formed at the place where the protruding portion 132 is connected to the side surface. In one embodiment, the top opening 11 is circular, and the positions of the bending portions 12 correspond to those of the sinking portions 13. That is to say, the connection line between the bending portions 12 and the sinking portions 13 generally passes through the center of the top opening 11 of the housing 10. In other words, the bending portions 12 are arranged at the positions corresponding to the sinking portions 13 of the central opening 11 and are integrally bent and extended downward from the inner edge of the top opening 11. Among them, the width of the upper end (i.e., the end closer to the top opening 11) of the bending portion 12 is smaller, and the width of the lower end (i.e., the end far from the top opening 11) of the bending portion 12 is larger. The bending portion 12 preferably has a thickness equivalent to that of the top of the housing.

[0072] Figures 3 - 6 They are the front views of different sides of the housing 10. As Figures 3 - 6 shown, the housing 10 has a first side portion 14, a second side portion 15, a third side portion 16, and a fourth side portion 17. Among them, the first side portion 14 is the motor output side, which cooperates with the first side portion of the base 60 and is provided with a buckle 141 at the end close to the fourth side portion 17. The buckle 141 bends from the outside to the inside to fix the base 60 and the housing 10 after the housing 10 is installed on the base 60. Two protruding portions 142 are also provided on the first side portion 14, and the two protruding portions 142 are arranged close to both ends of the first side portion 14 to cooperate with the notches on the first side portion of the base 60. The second side portion 15 is the circuit board installation side and is used to cooperate with the second side portion on the base 60. A notch 151 is provided at the bottom of the second side portion 15, and the notch 151 cooperates with the circuit board interface of the metal sheet 70 embedded in the base. The third side portion 16 is arranged opposite to the first side portion 14, and a protruding portion 161 protrudes integrally downward from the bottom of the third side portion 16, and the protruding portion 161 occupies a large area at the bottom. The fourth side portion 17 corresponds to the baffle on the base 60 and is provided with two protruding blocks 171 at the bottom to cooperate with the corresponding structures on the base.

[0073] Return to refer Figure 1, the frame 20 is generally in the shape of a rectangular frame structure and is disposed between the upper spring piece 20 and the housing 10. Specifically, the four corners of the frame 20 cooperate with the sunken part 13 of the housing 10 and are provided with overflow holes 21 for overflowing glue. Preferably, at least two overflow holes 21 are provided at each corner of the frame 20, and the two overflow holes 21 are preferably in a substantially right triangle shape.

[0074] Figure 7 is a top view of the upper spring piece 30. As Figure 7 shown, the upper spring piece 30 generally includes an outer ring 30A and an inner ring 30B. The inner ring 30B is provided with a carrier fixing part 31 and the outer ring 30A is provided with a housing fixing part 32. The carrier fixing part 31 and the housing fixing part 32 are movably connected by an elastic member 33. A plurality of carrier fixing parts 31 are provided on the inner ring, and the plurality of carrier fixing parts 31 are connected by an inner ring connecting part 34. In one embodiment, the inner ring connecting part 34 is integrally formed with the carrier fixing part 31, and the carrier fixing part 31 is formed in a plate shape and is provided with a plurality of small holes. The inner ring connecting part 34 is in a strip shape, preferably with uniform thickness. The entire inner ring forms an annular structure. The outer ring of the upper spring piece 30 generally forms a rectangular structure, and the housing fixing parts 32 are located at the four corners. The two housing fixing parts 32 are connected by an outer ring connecting part 35. One end of the elastic member 33 is connected to the carrier fixing part 31, and the other end is connected to the housing fixing part 32. Preferably, the elastic member 33 is integrally formed with the carrier fixing part 31 and the housing fixing part 32. In one embodiment, the elastic member 33 is an elastic strip, and the elastic strip forms at least one bend at the end close to the housing fixing part 32, so as to form an "S" - shaped structure as a whole, enabling the carrier fixing part 31 to move relative to the housing fixing part 32.

[0075] Figures 8 - 9 are perspective views of the carrier 40 from different perspectives. As Figures 8 - 9As shown, the carrier 40 is used to carry the lens and has a lens mounting hole 41 in the middle. A lens (not shown in the figure) is mounted in the lens mounting hole 41. Around the lens mounting hole 41, a first side portion 42, a second side portion 43, a third side portion 44, and a fourth side portion 45 of the carrier are formed, and the carrier 40 has a carrier upper surface 46 facing the housing 10 and a carrier lower surface 47 facing the base 60. The carrier upper surface 46 is provided with a plurality of upper spring piece connection portions 461. Adjacent to the upper spring piece connection portions 461, there are straight grooves 462. The straight grooves 462 extend from the carrier upper surface 46 to the carrier lower surface 47 and cooperate with the bent portion 12 on the housing 10. Specifically, the bent portion 12 of the housing 10 extends into the straight grooves 462, thereby relatively limiting the housing 10 and the carrier 40 to move within a certain direction and range. On the other side of the straight grooves 462, there is an upper surface protrusion 463. The upper surface protrusion 463 and the upper spring piece mounting portion 461 are located on both sides of the straight grooves 462 and are preferably symmetrically arranged. On the outer side of the straight grooves 462, there is a carrier sinking portion 464. The carrier sinking portion 464 can be provided with marks such as direction marks to facilitate the automated equipment to determine the mounting direction of the carrier.

[0076] The first side portion 42 and the third side portion 44 are oppositely arranged and are respectively provided with a first coil mounting portion 421 and a third coil mounting portion 441. The first coil 81 is wound around the first coil mounting portion 421, and the second coil 83 is wound around the second coil mounting portion 441. The first coil mounting portion 421 and the second coil mounting portion 441 include a plurality of protrusions integrally protruding outward from the first side portion 42 and the third side portion 44, and the coils are wound around the plurality of protrusions. The second side portion 43 corresponds to the circuit board 91 and is provided with a sensor magnet mounting groove 431 and a first winding post 432. The sensor magnet mounting groove 431 and the first winding post 432 are respectively arranged at both ends of the second side portion 43. Among them, the first winding post 432 is arranged at the end close to the first side portion 42, and the end of the first coil 81 wound around the coil mounting portion 421 of the first side portion 42 is fixed to the first winding post 432. The sensor magnet mounting groove 431 is arranged at the end close to the third side portion 44. The sensor magnet is mounted in the sensor magnet mounting groove 431 and cooperates with the sensor 911 on the circuit board 91 to detect the displacement information of the carrier 40. The third side portion 44 is opposite to the first side portion 42 and is provided with a second coil mounting portion 441. The second coil mounting portion 441 includes a plurality of protrusions integrally protruding outward from the third side portion 44, and the second coil 83 is wound around the plurality of protrusions. The fourth side portion 45 is opposite to the second side portion 43 and is used to cooperate with the baffle on the base 60. At the end of the fourth side portion 45 close to the third side portion 44, there is a second winding post 451, and the end of the second coil 83 wound around the second coil mounting portion 441 of the third side portion 44 is fixed to the second winding post 451.

[0077] Refer to Figure 9, the lower surface 47 of the carrier 40 is provided with a plurality of lower reed fixing posts 471 for connecting with the inner ring of the lower reed 50. The lower reed fixing posts 471 are used to fix the lower reed, and the lower reed is fixed by hot riveting after installation. The lower reed fixing posts 471 are integrally extended downward from the lower surface 47 of the carrier 40. One of the lower reed fixing posts 471 is disposed adjacent to the first winding post 432, and the other lower reed fixing post 471 is disposed adjacent to the second winding post 451, so as to electrically connect the base embedded metal sheet 70 and the circuit board 91 to the first coil 81 and the second coil 83 through the lower reed 50.

[0078] Figure 10 is a perspective view of the lower reed 50. As Figure 10 shown, the lower reed 50 generally includes an independent lower reed first part 51 and a lower reed second part 52, and the structures and shapes of the lower reed first part 51 and the lower reed second part 52 are similar. The lower reed first part 51 generally forms an arc structure, and a first base connection part 511 is formed at one end of the arc structure, a second carrier connection part 512 is formed at the other end of the arc structure, a first carrier connection part 513 is formed at approximately the middle part of the arc structure, a second base connection part 514 is formed by extending back from the second carrier connection part 512 along the arc structure to the middle part and at a position approximately in the middle, and the second base connection part 514 is adjacent to the first carrier connection part 513 and is located outside the first carrier connection part 513. Both between the first base connection part 511 and the first carrier connection part 513 and between the first carrier connection part 513 and the second carrier connection part 512 are connected by elastic strips, and the second carrier connection part 512 and the second base connection part 514 are connected by an elastic strip, and the elastic strip connecting the second carrier connection part 512 and the second base connection part 514 is bent at least twice near the second base connection part 514 to form at least one "S" shaped structure, and the elastic strip connecting the first base connection part 511 and the first carrier connection part 513 is bent at least twice near the first base connection part 511 to form at least one "S" shaped structure, so that relative movement can be carried out between the base connection part and the carrier connection part, so that after the base connection part and the carrier connection part are respectively connected to the base and the carrier, the base can perform relative movement with respect to the carrier.

[0079] Continue to refer to Figure 10, the first base connection portion 511 includes a first notch 5111 located in the middle and first fixing pieces 5112 located on both sides of the first notch 5111. First base fixing holes 5113 are provided on the first fixing pieces 5112. Among them, the first notch 5111 is preferably set in a rectangular shape, and the first fixing piece 5112 is preferably set in a substantially triangular shape. The second base connection portion 514 includes a second notch 5141 located in the middle, second base fixing pieces 5142 and a circuit board connection portion 5143 located on both sides of the second notch 5141. Preferably, the base fixing piece 5142 and the circuit board connection portion 5143 are symmetrically arranged with respect to the second notch 5141 and have similar shapes. Among them, second base fixing holes 5144 are provided on the second base fixing pieces 5142. The circuit board connection portion 5143 cooperates with a contact piece 733 passing through a contact hole 675 of the base 60 of the base-embedded metal sheet 70 to be electrically connected to the circuit board 91 through the base-embedded metal sheet 70.

[0080] The first carrier connection portion 513 integrally forms a block shape and is provided with a first carrier fixing hole 5131. The second carrier connection portion 512 integrally forms a block shape and is provided with a second carrier fixing hole 5121 and a coil connection portion 5122. The coil connection portion 5122 integrally extends from the edge of the second carrier connection portion 512. The coil connection portion 5122 is connected to the end of the coil wound around the carrier winding post, so as to be electrically connected to the coil installed on the carrier.

[0081] Similarly, the second part 52 of the lower spring piece integrally forms an arc structure and forms a first base connection portion 524 at one end of the arc structure, a second carrier connection portion 522 at the other end of the arc structure, and a first carrier connection portion 523 at approximately the middle of the arc structure. It extends back from the second carrier connection portion 522 along the arc structure to the middle and forms a second base connection portion 521 at approximately the middle position. The first base connection portion 524 and the first carrier connection portion 523, and the first carrier connection portion 523 and the second carrier connection portion 522 are connected by elastic strips. The second carrier connection portion 522 and the second base connection portion 521 are connected by an elastic strip. And the elastic strip connecting the second carrier connection portion 522 and the second base connection portion 521 is bent at least twice near the second base connection portion 521 to form at least one "S" - shaped structure, and the elastic strip connecting the first base connection portion 524 and the first carrier connection portion 523 is bent at least twice near the first base connection portion 524 to form at least one "S" - shaped structure, so that relative movement can occur between the base connection portion and the carrier connection portion, so that after the base connection portion and the carrier connection portion are respectively connected to the base and the carrier, the base can move relative to the carrier.

[0082] Continue to refer to Figure 10, the first base connection part 524 includes a first notch 5241 located in the middle, and a first fixing piece 5242 and a circuit board connection part 5243 on both sides of the first notch 5241. A first base fixing hole 5244 is provided on the first fixing piece 5242. Among them, the first notch 5241 is preferably set in a rectangular shape, the first fixing piece 5242 is preferably set in a substantially triangular shape, and the first base fixing piece 5242 and the circuit board connection part 5243 are symmetrically arranged with respect to the first notch 5241 and have similar shapes. Among them, a first base fixing hole 5244 is provided on the first base fixing piece 5242. The circuit board connection part 5243 is in contact with a contact piece passing through a contact hole 675 of the base 60 of the base-embedded metal piece 70, so as to be electrically connected to the circuit board 91 through the base-embedded metal piece 70. The second base connection part 521 includes a second notch 5211 located in the middle and second base fixing pieces 5212 on both sides of the second notch 5211. A second base fixing hole 5213 is provided on the second base fixing piece 5212. The second notch 5211 is preferably set in a rectangular shape, and the second fixing piece 5212 is preferably set in a substantially triangular shape. The first carrier connection part 523 integrally forms a block shape and is provided with a first carrier fixing hole 5231. The second carrier connection part 522 integrally forms a block shape and is provided with a second carrier fixing hole 5221 and a coil connection part 5222. The coil connection part 5222 extends integrally from the edge of the second carrier connection part 522. The coil connection part 5222 is connected to the coil winding wound on the carrier winding post, so as to supply power to the coil installed on the carrier.

[0083] Continue to refer to Figure 10 , the second carrier connection part 522 of the second part 52 of the lower spring piece is arranged adjacent to the first base connection part 511 of the first part 51 of the lower spring piece, and the first base connection part 524 of the second part 52 of the lower spring piece is arranged adjacent to the second carrier connection part 512 of the first part 51 of the lower spring piece. Thus, the lower spring piece 50 integrally forms an arc-shaped structure and includes two first carrier connection parts and two second carrier connection parts located in the inner circle, and two first base connection parts and two second base connection parts located in the outer circle. The inner circle and the outer circle are connected by a bent elastic strip, so that the inner circle and the outer circle can perform elastic deformation and relative movement, and thus the base and the carrier connected by the lower spring piece can also perform relative movement.

[0084] Specifically, the first part 51 of the lower spring piece is installed on the third side and the bottom of the second side of the carrier 40, and the third side and the bottom of the second side of the base 60. The second part 52 of the lower spring piece is installed on the fourth side and the bottom of the first side of the carrier 40, and the fourth side and the bottom of the first side of the base 60. The first carrier fixing holes 5131 and the second carrier fixing holes 5121 of the first part 51 of the lower spring piece cooperate with the lower spring piece fixing posts 471 at the third side and the bottom of the second side of the carrier 40. The first carrier fixing holes 5231 and the second carrier fixing holes 5221 of the second part 52 cooperate with the lower spring piece fixing posts 471 at the fourth side and the bottom of the first side of the carrier 40. The first base fixing hole 5113 of the first part 51 of the lower spring piece cooperates with the spring piece fixing post 692 at the fourth side of the base 60 and the spring piece fixing post 682 at the third side. The second base fixing hole 5144 of the first part 51 of the lower spring piece cooperates with the spring piece fixing post 682 at the third side. The circuit board mounting part 5413 of the first part 51 of the lower spring piece cooperates with the contact hole 675 at one end close to the third side of the second side of the base 60. The first base fixing hole 5244 of the second part 52 of the lower spring piece cooperates with the spring piece fixing post 661 at the first side of the base 60. The circuit board mounting part 5243 of the second part 52 of the lower spring piece cooperates with the contact hole 675 at one end close to the first side of the second side of the base 60. The second base fixing hole 5213 of the second part 52 of the lower spring piece cooperates with the spring piece fixing post 661 at the first side and the spring piece fixing post 692 at the fourth side of the base 60. Each support post 63 of the base 60 is respectively located in each first notch and each second notch of the first part 51 and the second part 52 of the lower spring piece 50.

[0085] Figure 11 is a perspective view of the base 60. The following refers to Figure 11 to describe the base 60 of an embodiment of the present invention. As Figure 11As shown, the base 60 generally includes a bottom plate 61. The bottom plate 61 generally forms a rectangular structure and has an opening 62 in the middle to cooperate with the lens mounting hole 41 of the carrier 40. Support columns 63 are formed at the four corners of the bottom plate 61. The support columns 63 extend upward from the bottom plate 61 by a certain distance. The heights of the four support columns 63 are basically equal, and they cooperate with the first notches and second notches of the lower spring piece 50 and the housing 10 to play a role in support and strengthening the overall structure. In the illustrated embodiment, the cross-section of the support column 63 is generally rectangular and has a notch 631 on the outside. The bottom of the notch 631 is an inclined surface 632 to facilitate the installation of the housing 10. A damping rubber groove 633 is formed on the inner side of the support column 63 to accommodate damping rubber. Specifically, a step portion 634 is formed at approximately the middle position on the inner side of the support column 63. The surface of the step portion 634 forms a downwardly concave damping rubber groove 633. Preferably, two damping rubber grooves 633 perpendicular to the inner surface of the support column 63 are formed on each step portion 634, and each damping rubber groove 633 is an arc-shaped groove, that is, the side wall of the damping rubber groove 633 has an arc shape, so as to form a shape with a smaller bottom and a width gradually increasing from the bottom to the top.

[0086] The bottom plate 60 surrounds the open end 61 to form a first side portion 66, a second side portion 67, a third side portion 68, and a fourth side portion 69. The first side portion 66 and the third side portion 68 are respectively used for installing the first magnet 82 and the second magnet 84. The second side portion 67 is used for installing the circuit board 91. The fourth side portion 69 is opposite to the second side portion 67 and is provided with a baffle 691. Specifically, at both ends of the first side portion 66, there are reed fixing posts 661, and positioning holes 662 are provided adjacent to the reed fixing posts 661. Preferably, one positioning hole 662 is provided on each of the inner and outer sides of the reed fixing posts 661. The positioning holes 662 are used for grasping and identifying by automated equipment. The second side portion 67 is provided with a mounting plate 671 extending upward from the bottom plate 62. The mounting plate 671 extends upward from the bottom plate by a certain distance. The height of the mounting plate 671 is approximately the same as the height of the support columns 63 at the four corners. At one end of the mounting plate 671 close to the first side portion 66, there is a capacitor avoidance opening 672. At one end of the mounting plate 671 close to the third side portion 68, there is a sensor avoidance opening 673. In the middle of the mounting plate 671, there is a circuit board positioning post 674. The positioning holes of the circuit board 91 are correspondingly matched with the circuit board positioning posts 674 to fixedly install the circuit board 91 on the mounting plate 671 of the base 60. After the circuit board 91 is installed on the mounting plate 671, the capacitors on the circuit board 91 are aligned and matched with the capacitor avoidance opening 672, and the sensors on the circuit board 91 are aligned and matched with the sensor avoidance opening 673 and are aligned with the sensors on the carrier 40 using magnets. The capacitor avoidance opening 672 extends from the top to the bottom of the mounting plate 671 and forms an opening above. An arc-shaped side wall is formed on the side wall of the capacitor avoidance opening 672 close to the mounting plate 671. At both ends of the second side portion 67, there are also contact pad holes 675. When the base-embedded metal sheet 70 is installed in the base 60, the contact pads 733 of the base-embedded metal sheet 70 are located in the contact pad holes 675, so as to be electrically connected to the circuit board 91. Preferably, the contact pad holes 675 are provided adjacent to the support columns 63 and have a shape similar to that of the contact pads 733 of the base-embedded metal sheet 70. A groove 676 extending from top to bottom is formed in the middle of the mounting plate 671. The circuit board positioning post 674 is arranged in the groove 676 and is approximately located in the middle of the groove 676. The width of the lower part of the groove 676 is smaller than that of the upper part. The upper part integrally forms a rectangular groove, and the lower part integrally forms another rectangular groove with a smaller width.

[0087] The third side portion 68 is disposed opposite to the first side portion 66 and is used for installing magnets. Its structure and function are similar to those of the first side portion 66. There are reed fixing posts 681 at both ends, and positioning holes 682 are provided adjacent to the reed fixing posts 681. Preferably, there is a positioning hole 682 on each of the inner and outer sides of the reed fixing post 681. The fourth side portion 69 is disposed opposite to the third side portion 67 and has a baffle 691 extending in the vertical direction. The baffle 691 integrally protrudes upward from the middle position of the fourth side portion 69 and has a height approximately equal to that of the support posts 63 at the four corners and the mounting plate 671 on the second side portion, which plays a role in strengthening the overall strength of the base. The two ends of the fourth side portion 69 are similar to those of the first side portion and the third side portion. There are reed fixing posts 692 at both ends, and positioning holes 693 are provided adjacent to the reed fixing posts 692. Preferably, there is a positioning hole 693 on each of the inner and outer sides of the reed fixing post 692.

[0088] Figure 12 is a perspective view of the base with an embedded metal sheet. Figure 13 is a perspective view of the component with the circuit board combined with the embedded metal sheet of the base. As Figures 12 - 13 shown, the base embedded metal sheet 70 is disposed in the base 60 and has an annular structure main body 71. One of the adjacent two side portions of the main body 71 is respectively provided with an access end 72 and a circuit board connection end 73. The circuit board connection end 73 includes a plurality of protruding pieces 731. An opening 732 is defined between the plurality of protruding pieces 731. The bottom of the circuit board 91 is provided with an opening matching the protruding pieces 731. The circuit board 91 is connected to the base embedded metal sheet by inserting the protruding pieces 731 of the base embedded metal sheet 70 into the bottom opening of the circuit board 91. The ends of the plurality of protruding pieces 731 are substantially on the same straight line, and contact pieces 733 are provided at both ends of the side portion of the base embedded metal sheet 70 where the plurality of protruding pieces are provided. The contact pieces 733 cooperate with the contact holes 675 on the base 60. When the base embedded metal sheet 70 is installed in the base 60, the contact pieces 733 are located in the contact holes 675 and are used for electrical connection with the coil. The access end 72 is disposed on the side portion adjacent to the circuit board connection end 73 and includes a plurality of lead-in pieces 72 for connection with an external circuit. At least two protruding portions 74 are provided on the side portion of the base embedded metal sheet 70 opposite to the circuit board connection end 73 to strengthen the strength of the base 60.

[0089] Referring to Figure 13, the circuit board 91 is installed on the base 60 and cooperates with the metal sheet 70 embedded in the base. Specifically, the circuit board 91 integrally forms a rectangular block structure and has an inner surface facing the carrier and an outer surface facing the housing. A sensor 911 and a capacitor 912 are provided on the inner surface. The sensor 911 is aligned with the sensor avoidance opening 673 on the base 60 and correspondingly cooperates with the sensor magnet 92 installed on the carrier 40. The capacitor 912 correspondingly cooperates with the capacitor avoidance opening 672 on the base 60. A plurality of openings 913 are provided at the bottom of the circuit board 91. The openings 913 cooperate with the protruding pieces 731 of the metal sheet 70 embedded in the base to clamp the circuit board 91 on the metal sheet 70 embedded in the base and provide electrical connection at the same time. The contact piece 733 of the metal sheet 70 embedded in the base is located outside both ends of the circuit board 91.

[0090] Figure 14 is a cross-sectional view of the lens driving mechanism 100 according to an embodiment of the present invention. Figure 15 is another cross-sectional view of the lens driving mechanism 100 according to an embodiment of the present invention, in which the housing has been removed. As Figures 14 - 15 shown, during installation, the frame 20 is located between the upper surface of the upper spring piece 30 and the lower surface of the housing 20. The outer ring and the inner ring of the upper spring piece 30 are respectively fixedly connected to the bottom of the housing and the top of the carrier. The bent portion 12 of the housing 10 extends into the straight groove 462 of the carrier 40. The outer ring and the inner ring of the lower spring piece 50 are respectively fixedly connected to the base 60 and the lower surface of the carrier 40. The metal sheet 70 embedded in the base is installed in the base 60. The first magnet 82 and the second magnet 84 are respectively installed on the first side portion 66 and the second side portion 68 of the base 60. The first coil 81 and the second coil 83 are respectively installed on the first side portion 42 and the third side portion 44 of the carrier 40. The sensor magnet 92 and the sensor magnet gasket 93 are installed in the sensor magnet installation groove 431 on the second side portion of the carrier 40 to regularize the magnetic field. The circuit board 91 is installed on the second side portion 67 of the base 60. Each support column 63 at the four corners of the base 60 cooperates with the sunken portion 13 of the housing 10. The bent portion 12 of the housing 10 extends into the straight groove 462 of the carrier 40 to prevent inward rotation and tilting during driving. The buckle 141 is snapped into the lower surface of the base 60. During operation, the external current reaches the circuit board 91 through the access end 72 of the metal sheet 70 embedded in the base via the metal sheet 70 embedded in the base, and then is electrically connected to the first coil 81 and the second coil 82 through the contact piece 733, the circuit board connection portion and the coil connection portion of the lower spring piece 50. The energized first coil and second coil drive the carrier 40 to move along the optical axis direction under the action of the magnetic field forces of the first magnet 82 and the second magnet 84. The sensor 911 detects the displacement of the carrier by sensing the displacement of the sensor magnet 92 and transmits the displacement information to the control unit (not shown in the figure).

[0091] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A lens driving mechanism, characterized in that, The lens driving mechanism includes a housing, a base, a carrier, a magnetic element, a coil assembly, a circuit board, and a lower spring piece. The carrier is used to mount the lens. The coil assembly is mounted on opposite sides of the carrier. The magnetic element is mounted on the base and cooperates with the coil assembly. The lower spring piece movably connects the carrier to the base. The circuit board is disposed on the base and faces one side of the carrier. Among them, the lower spring piece electrically connects the circuit board to the coil assembly; The lens driving mechanism further includes a housing. A lens mounting hole is provided in the middle of the carrier for mounting the lens. A top opening is provided at the top of the housing to cooperate with the lens. A plurality of bending portions are provided around the top opening. And the carrier is provided with a straight groove that surrounds the lens mounting hole and extends along the optical axis direction. The bending portions extend into the straight groove; The lens driving mechanism further includes an upper spring piece. The upper spring piece includes an outer ring for fixedly connecting with the housing and an inner ring for connecting with the upper surface of the carrier. The outer ring and the inner ring are connected by an elastic strip; The lens driving mechanism further includes a frame. The frame is of a rectangular frame structure and is disposed between the upper spring piece and the housing. At least two overflow holes are provided at each corner of the frame to overflow glue; Sunken portions are provided at the four corners of the upper surface of the housing. The outer ring of the upper spring piece is fixedly connected to the lower surface of the sunken portion through the frame.

2. The lens driving mechanism according to claim 1, wherein The base includes a bottom plate and a mounting plate extending upward from the bottom plate by a certain distance. The circuit board is mounted on the mounting plate.

3. The lens driving mechanism according to claim 2, characterized in that, The circuit board has an inner surface facing the carrier. A sensor and a capacitor are provided on the inner surface. The mounting plate is provided with a sensor avoidance opening for avoiding the sensor and a capacitor avoidance opening for avoiding the capacitor.

4. The lens driving mechanism according to claim 3, characterized in that, A wire winding post and a sensor magnet mounting groove are further provided on the side of the carrier corresponding to the circuit board. The sensor magnet mounting groove and the wire winding post are respectively located at both ends of this side.

5. The lens driving mechanism according to claim 4, wherein, A first side portion, a second side portion, a third side portion, and a fourth side portion of the carrier are sequentially formed around the lens mounting hole. The first side portion and the third side portion are oppositely arranged and are used to mount the coil assembly. And the second side portion corresponds to the circuit board and is provided with a sensor magnet mounting groove.

6. The lens driving mechanism according to claim 5, wherein The wire winding post includes a first wire winding post provided on the second side portion and a second wire winding post provided on the fourth side portion. The coil assembly includes a first coil mounted on the first side portion and a second coil mounted on the third side portion. The end of the first coil is wound around the first wire winding post. The end of the second coil is wound around the second wire winding post.

7. The lens driving mechanism according to claim 1, wherein The lower spring piece includes two independent parts. Each part includes at least two base connection parts and at least two carrier connection parts. One base connection part includes a notch and a base fixing piece and a circuit board connection part respectively provided on both sides of the notch. The circuit board connection part is electrically connected to the circuit board. The base fixing piece is fixedly connected to the base.

8. The lens driving mechanism according to claim 7, wherein Support columns are provided at four corners of the base, and the notch of the lower spring piece is matched with the support columns.

9. The lens driving mechanism according to claim 2, wherein A base-embedded metal sheet is provided inside the base. The base-embedded metal sheet includes a contact piece. The bottom plate is provided with a contact piece hole. The contact piece is located in the contact piece hole. When the lower spring piece is installed on the base, the circuit board connecting portion contacts the contact piece.

10. The lens driving mechanism according to claim 2, wherein, The base is further provided with a baffle, and the baffle is arranged on the side opposite to the mounting plate.

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