Lens module

Abstract

A lens module includes a lens, an imaging chip, a circuit board, a movable carrier, a magnetic excitation coil and a magnetic element, wherein the imaging chip is arranged on the circuit board, the movable carrier can be movably connected to the circuit board, the lens is fixedly arranged on the movable carrier, the magnetic excitation coil is arranged on the movable carrier, and the magnetic element is arranged on the circuit board, and the magnetic excitation coil and the magnetic element can interact with each other to generate a driving force to drive the movable carrier to move in a plane perpendicular to the optical axis direction. The lens module provided by the present invention adds a movable carrier inside the module as a mechanical structure for realizing optical image stabilization, and by controlling the direction and magnitude of the current loaded into the magnetic excitation coil installed on the movable carrier, the moving direction and moving distance of the movable carrier can be controlled, thereby driving the lens to move in a specific direction and a specific distance, compensating for the slight movement of the lens caused by hand shaking when taking pictures, stabilizing the optical path, and solving the problem of image blur caused by hand shaking during taking pictures.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to a lens module. Background Art

[0002] At present, with the development of mobile communication technology, smart phones have become an indispensable part of people's lives, and mobile phone cameras have become standard equipment for smart phones, and mobile phone users have higher and higher requirements for the shooting effects of mobile phone cameras. Commonly used lens modules include autofocus lens modules composed of lenses, VCM motors, imaging chips and PCB boards, and fixed-focus lens modules composed of lenses, imaging chips and PCB boards. However, when shooting with these two types of lens modules, the problem of image blur caused by hand shaking during shooting cannot be solved. In this regard, the general solution is to directly add an optical image stabilization motor to the traditional lens module, but this will lead to excessively high production costs of the lens module, which will in turn affect the market competitiveness of the corresponding products. Therefore, it is necessary to design a new lens module with optical image stabilization function. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a lens module that enables the lens to move in a plane perpendicular to the optical axis, so as to solve the problem of image blur caused by hand shaking during the photo-taking process.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A lens module described in the present invention includes a lens, an imaging chip and a circuit board, wherein the imaging chip is arranged on the circuit board, and the lens module also includes a movable carrier, a magnetic excitation coil and a magnetic element. The movable carrier can be movably connected to the circuit board, and the lens is fixed on the movable carrier, the magnetic excitation coil is arranged on the movable carrier, and the magnetic element is arranged on the circuit board. The magnetic excitation coil and the magnetic element can interact with each other to generate a driving force to drive the movable carrier to move in a plane perpendicular to the optical axis direction.

[0006] A lens module provided by the present invention adds a movable carrier, a mechanical structure for realizing optical image stabilization, inside the module. By controlling the direction and magnitude of the current loaded into the magnetic excitation coil installed on the movable carrier, the moving direction and moving distance of the movable carrier can be controlled, thereby driving the lens to move a specific distance in a specific direction, compensating for the slight movement of the lens caused by hand shaking during photographing, stabilizing the optical path, and solving the problem of image blur caused by hand shaking during photographing.

[0007] In one embodiment, the lens module includes at least two magnetic excitation coils, and the two magnetic excitation coils are arranged in directions perpendicular to each other. A magnetic element is correspondingly provided on the circuit board relative to each magnetic excitation coil, and the directions of the driving forces generated by the interaction between the two magnetic excitation coils and the corresponding magnetic elements are perpendicular to each other.

[0008] In one embodiment, the lens module includes four magnetic excitation coils and four magnetic elements. The four magnetic excitation coils are divided into two groups and arranged in directions perpendicular to each other, and the two magnetic excitation coils in each group are arranged in parallel and spaced apart from each other. The four magnetic elements are arranged around the imaging chip.

[0009] In one embodiment, the magnetic excitation coil is a rectangular coil formed by winding a core wire, including a first long side and a second long side, the axial direction of the core wire of the magnetic excitation coil is parallel to the optical axis of the lens, the first long side is located above the magnetic element, and the second long side is located on one side of the magnetic element; one magnetic pole of the magnetic element is arranged adjacent to the magnetic excitation coil, and the other magnetic pole of the magnetic element is arranged away from the magnetic excitation coil.

[0010] In one embodiment, the magnetic excitation coil is a rectangular coil formed by winding a core wire, including a first long side and a second long side, the axial direction of the core wire of the magnetic excitation coil is perpendicular to the optical axis of the lens, and the axial directions of the core wires of the two magnetic excitation coils are perpendicular to each other, the first long side is located above the magnetic element, and the second long side is located above the first long side; one magnetic pole of the magnetic element is arranged adjacent to the magnetic excitation coil, and the other magnetic pole of the magnetic element is arranged away from the magnetic excitation coil.

[0011] In one embodiment, the movable carrier is provided with a corresponding lens holder for mounting the lens, and the lens is fixed to the movable carrier via the lens holder; alternatively, the lens module further comprises a voice coil motor, the lens is mounted in the voice coil motor, and can be moved along the optical axis direction of the lens under the drive of the voice coil motor, and the base of the voice coil motor is fixedly connected to the movable carrier.

[0012] In one embodiment, the lens module also includes a vibration sensing element and a controller, wherein the vibration sensing element senses the shake of the lens, and the controller receives the signal sensed by the vibration sensing element and calculates the direction and magnitude of the current required to be loaded on each of the magnetic excitation coils, thereby controlling the movement of the movable carrier to compensate for the shake of the lens.

[0013] In one embodiment, the movable carrier is movably connected to the circuit board through a connecting structure, wherein the connecting structure includes a plurality of pull rods, and the movable carrier is provided with a plurality of connecting positions corresponding to the plurality of pull rods, one end of each of the pull rods is fixedly connected to the circuit board, and the other end is fixedly connected to the connecting position; or, the connecting structure includes a plurality of groups of tension spring ball structures, one end of the tension spring in each group of the tension spring ball structures is fixedly connected to the circuit board, and the other end is fixedly connected to the movable carrier, and the balls in each group of the tension spring ball structures are installed on a side of the movable carrier facing the circuit board to support the movable carrier; or, the connecting structure includes a planar spring sheet, and the planar spring sheet includes a first connecting portion fixedly connected to the movable carrier and a second connecting portion fixedly connected to the circuit board, the first connecting portion and the second connecting portion are connected by an elastically deformable spring portion, and a support column is correspondingly provided on the circuit board relative to the planar spring sheet, and the support column is fixedly connected to the corresponding second connecting portion of the planar spring sheet so that the movable carrier is suspended above the circuit board.

[0014] In one embodiment, the lens module also includes a bracket and a filter fixed to the bracket, the filter is located on a side of the lens close to the imaging chip, the bracket is fixedly connected to the magnetic element, and the filter is fixedly mounted above the imaging chip through the bracket.

[0015] In one embodiment, the lens module also includes a protective cover, which includes four rectangular side panels fixedly connected to the circuit board, the four rectangular side panels are connected in pairs and are arranged around the periphery of the magnetic element, the tops of the four rectangular side panels are bent and extended upward to form an upper baffle, the upper baffle covers the edge area around the movable carrier to accommodate the magnetic element, the imaging chip and the movable carrier in sequence inside the lens module, and the four rectangular side panels are spaced apart from the movable carrier.

[0016] Other advantages of the present invention will be described in detail in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the lens module according to the first embodiment of the present invention;

[0019] Figure 2 for Figure 1 A first-angle exploded perspective view of the lens module shown;

[0020] Figure 3 for Figure 1 A second angle exploded perspective view of the lens module shown;

[0021] Figure 4 for Figure 1 A partial structural schematic diagram of the lens module shown;

[0022] Figure 5 for Figure 1 A top view of the internal structure of the lens module shown;

[0023] Figure 6 for Figure 5 The cross-sectional structure diagram of the internal structure of the lens module along AA is shown;

[0024] Figure 7 for Figure 1 A schematic diagram showing the positional relationship between the magnetic excitation coil and the magnetic element in the lens module;

[0025] Figure 8 for Figure 7 A schematic diagram showing the positional relationship between the magnetic excitation coil and the magnetic element from another angle;

[0026] Fig. 9 for Figure 7 Schematic diagram of the interaction between the magnetic excitation coil and the magnetic element in the position relationship shown;

[0027] Fig.10 for Figure 1 The cross-sectional structure diagram of the lens module shown;

[0028] Fig.11 Another schematic diagram of the positional relationship between the magnetic excitation coil and the magnetic element in the lens module of the present invention;

[0029] Fig.12 It is a structural schematic diagram of another embodiment of the movable carrier in the lens module of the present invention;

[0030] Fig.13 for Fig.11 Schematic diagram of the interaction between the magnetic excitation coil and the magnetic element in the position relationship shown;

[0031] Fig.14 This is a schematic diagram of the three-dimensional structure of a lens module according to a second embodiment of the present invention;

[0032] Fig.15 for Fig.14 A first-angle exploded perspective view of the lens module shown;

[0033] Fig.16 for Fig.14 A second angle exploded perspective view of the lens module shown;

[0034] Fig.17 for Fig.14 The cross-sectional structure diagram of the lens module shown.

[0035] Description of reference numerals: 10, lens 13, voice coil motor 20, imaging chip 30, circuit board 33, connection structure 35, magnetic element 40, movable carrier 41, lens holder 43, connection position 45, magnetic excitation coil 451, first long side 453, second long side 50, bracket 55, filter 60, protective cover 63, rectangular side plate 65, upper baffle DETAILED DESCRIPTION

[0036] To further explain the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings, in which the same reference numerals represent the same components.

[0037] The present invention provides a lens module, in combination with Figures 1 to 3 The lens module of the first embodiment includes a lens 10, an imaging chip 20, a circuit board 30, a magnetic element 35, a movable carrier 40 and a magnetic excitation coil 45, wherein the imaging chip 20 is arranged on the circuit board 30, the movable carrier 40 is movably connected to the circuit board 30 through a connecting structure 33, and the lens 10 is fixedly arranged on the movable carrier 40, the magnetic excitation coil 45 is arranged on the movable carrier 40, and the magnetic element 35 is arranged on the circuit board 30. The magnetic excitation coil 45 and the magnetic element 35 can interact with each other to generate a driving force to drive the movable carrier 40 to move in a plane perpendicular to the optical axis direction.

[0038] In this embodiment, the lens module includes at least two magnetic excitation coils 45, and the two magnetic excitation coils 45 are arranged on the movable carrier 40 in directions perpendicular to each other. The corresponding lens module includes at least two magnetic elements 35. A magnetic element 35 is correspondingly arranged on the circuit board 30 relative to each magnetic excitation coil 45. When current is loaded in the magnetic excitation coil 45, each magnetic excitation coil 45 interacts with its corresponding magnetic element 35 to generate a driving force. The directions of the driving forces on the two magnetic excitation coils 45 arranged in directions perpendicular to each other are perpendicular to each other, so as to drive the movable carrier 40 to move in a plane perpendicular to the optical axis. In the lens module provided by the present invention, the magnetic excitation coils 45 on the movable carrier 40 are not limited to being arranged along two groups of opposite sides of the movable carrier 40, and the directions of the driving forces generated by the interaction between the two magnetic excitation coils 45 and their corresponding magnetic elements 35 are not limited to being perpendicular to each other. Two or more magnetic excitation coils 45 can also be arranged in a manner that the directions of the driving forces generated by each of them form a certain acute angle, as long as the combined force of the driving forces received by the magnetic excitation coils 45 can drive the movable carrier 40 to move in a plane perpendicular to the optical axis.

[0039] Please refer to Figures 1 to 4 The lens module in this embodiment is a fixed-focus lens module. An opening for light to pass through is provided at the center of the movable carrier 40. A lens holder 41 for mounting the lens 10 is provided at the opening. The lens 10 is fixed to the movable carrier 40 through the lens holder 41. The lens 10 can be fixedly connected to the lens holder 41 by glue dispensing or threaded tightening. Four magnetic excitation coils 45 are provided on one side of the movable carrier 40 facing the circuit board 30. Figure 3 As shown, the movable carrier 40 is a rectangular structure with an opening in the center, and the four magnetic excitation coils 45 are divided into two groups and arranged along two opposite sides of the movable carrier 40, that is, the arrangement directions of the two groups of magnetic excitation coils 45 are perpendicular to each other, and the two magnetic excitation coils 45 in each group are arranged in parallel with each other. Correspondingly, four magnetic elements 35 are arranged on the circuit board 30, and the four magnetic elements 35 are arranged around the imaging chip 20, and the magnetic elements 35 are arranged one by one with the magnetic excitation coils 45. Figures 4 to 10 ,in, Figure 4 The structure of the movable carrier 40 is made transparent so as to show the relative positional relationship between the magnetic excitation coil 45 and the magnetic element 35 mounted on the side of the movable carrier 40 facing the circuit board 30; Figure 7 The direction of the Z axis is the direction of the lens optical axis, and the Z axis is perpendicular to the plane where the X axis and the Y axis are located. Specifically, in this embodiment, the relative position relationship between the magnetic excitation coil 45 on the movable carrier 40 and the magnetic element 35 on the circuit board 30 is as follows: Figure 4 and Figure 7 As shown, the magnetic excitation coil 45 is a rectangular coil formed by winding a core wire, including a first long side 451 and a second long side 453 which are opposite to each other. The axial direction of the core wire of the magnetic excitation coil 45 is parallel to the optical axis of the lens, and the plane where the magnetic excitation coil 45 is located is parallel to the plane where the circuit board 30 is located. Among them, the first long side 451 of the magnetic excitation coil 45 is located above the magnetic element 35, and the second long side 453 is away from the magnetic element 35 and is located on one side of the magnetic element 35. For each magnetic excitation coil 45, only the first long side 451 located above the magnetic element 35 is within the magnetic action range of its corresponding magnetic element 35. When the magnetic excitation coil 45 is energized, the first long side 451 interacts with the magnetic element 35 to generate a driving force, driving the movable carrier 40 to move in a plane perpendicular to the optical axis direction. In this embodiment, the principle of the interaction between the magnetic excitation coil 45 and the magnetic element 35 is as follows: Fig. 9 As shown, Fig. 9 The magnetic excitation coil 45 is Figure 7The magnetic excitation coil 45 is one of a group of magnetic excitation coils 45 arranged along the X-axis direction, the Z-axis direction represents the direction of the optical axis of the lens, the magnetic north pole of the magnetic element 35 is arranged adjacent to the first long side 451 of the magnetic excitation coil 45, and the magnetic south pole of the magnetic element 35 is arranged away from the magnetic excitation coil 45. When the magnetic excitation coil 45 is energized, current continues to flow through the first long side 451 of the magnetic excitation coil 45. Fig. 9 The direction of the current in the first long side 451 is perpendicular to the paper and inward, and the magnetic field direction of the magnetic north pole on the magnetic element 35 is shown by the magnetic flux lines. According to the left-hand rule, it can be determined that the first long side 451 is subjected to the Ampere force in the X direction; when Fig. 9 When the current direction in the first long side 451 is changed to perpendicular to the paper plane and outward, the direction of the Ampere force on the first long side 451 is changed to the opposite direction of the X direction. Similarly, after the other group of magnetic excitation coils 45 arranged along the Y-axis direction are energized, they can be acted on by the Ampere force along the Y direction or the opposite direction of the Y direction, and the movable carrier 40 can be driven by the Ampere force to move in the XY plane. It can be seen that by controlling the direction and size of the current loaded into each magnetic excitation coil 45, the displacement direction and displacement amount of the movable carrier 40 can be accurately controlled, so that the movable carrier 40 moves in a plane perpendicular to the optical axis direction. It is easy to know that the magnetic south pole of the magnetic element 35 can also be arranged adjacent to the magnetic excitation coil 45, and the magnetic north pole of the magnetic element 35 can be arranged away from the magnetic excitation coil 45.

[0040] In the lens module provided by the present invention, the movable carrier 40 is movably connected to the circuit board 30 via the connecting structure 33 .

[0041] In this embodiment, the movable carrier 40 is movably connected to the circuit board 30 via four pull rods. Figure 2 As shown, the movable carrier 40 is provided with connection positions 43 at the four vertex corners, one end of the pull rod is fixedly connected to the circuit board 30, and the other end is fixedly connected to the connection position 43 by soldering. When the current is loaded in the magnetic excitation coil 45, the movable carrier 40 is driven by the Ampere force and moves in a plane perpendicular to the optical axis direction relative to the circuit board 30. When the magnetic excitation coil 45 is powered off, the movable carrier 40 returns to its original position under the traction of the pull rod. In other embodiments, the number of pull rods can be increased or decreased according to specific needs, and the number of pull rods is not limited to four, as long as the movable carrier 40 can be kept suspended above the circuit board 30 in a balanced manner; the pull rod can also be fixedly connected to the connection position 43 by injection molding or laser welding, and according to different connection methods, the connection position 43 can be designed into different forms accordingly.

[0042] In this embodiment, a vibration sensing element (not shown) for sensing the direction and magnitude of the shaking of the lens 10 is correspondingly provided on the circuit board 30 of the fixed-focus lens module. The vibration sensing element senses the slight movement of the lens 10 caused by hand shaking during the shooting process. The microprocessor (not shown) receives the sensing signal of the vibration sensing element and calculates the direction and magnitude of the current that needs to be loaded on each magnetic excitation coil 45 based on the sensing signal, and then controls the moving direction and moving distance of the movable carrier 40 to compensate for the shaking of the lens 10, thereby solving the problem of image blur caused by hand shaking during the shooting process.

[0043] In this embodiment, the fixed-focus lens module also includes a bracket 50 and a filter 55 fixed on the bracket 50. The filter 55 is located on the side of the lens 10 close to the imaging chip 20, specifically, between the movable carrier 40 and the magnetic element 35. The bracket 50 is fixedly connected to the magnetic element 35, and the filter 55 is fixedly installed above the imaging chip 20 through the bracket 50. When taking pictures, light enters from the lens 10, passes through the central opening of the movable carrier 40 and the filter 55, and finally is incident on the imaging chip 20.

[0044] In the present embodiment, the fixed-focus lens module also includes a protective cover 60 made of metal material, and the protective cover 60 includes four rectangular side panels 63 fixedly connected to the circuit board 30. The four rectangular side panels 63 are connected in pairs and are arranged around the periphery of the magnetic element 35. The tops of the four rectangular side panels 63 are bent and extended upward to form an upper baffle 65. The upper baffle 65 covers the edge area around the movable carrier 40 to accommodate the magnetic element 35, the imaging chip 20 and the movable carrier 40 in sequence inside the lens module. At the same time, the four rectangular side panels 63 of the protective cover 60 are spaced apart from the movable carrier 40 to ensure that the movable carrier 40 has sufficient movable space inside the protective cover 60, so that the movement of the movable carrier 40 in a plane perpendicular to the optical axis direction is not hindered.

[0045] In another embodiment, the relative position relationship between the magnetic excitation coil 45 on the movable carrier 40 and the magnetic element 35 on the circuit board 30 is as follows: Fig.11 As shown, the corresponding magnetic excitation coil 45 is installed on the movable carrier 40 as shown in FIG. Fig.12 As shown, four side panels extend downward from the edges of the movable carrier 40, and four magnetic excitation coils 45 are respectively installed on the sides of the four side panels. The magnetic excitation coils 45 are rectangular coils formed by winding core wires, including a first long side 451 and a second long side 453 that are opposite to each other. The axis directions of the winding core wires of the four magnetic excitation coils 45 are all perpendicular to the optical axis of the lens. Specifically, the four magnetic excitation coils 45 are divided into two groups and are respectively arranged along two groups of opposite sides of the movable carrier 40, so that the axis directions of the winding core wires of the two groups of magnetic excitation coils 45 are perpendicular to each other, and the planes where the four magnetic excitation coils 45 are located are all perpendicular to the plane where the circuit board 30 is located. Fig.11 As shown, the first long side 451 of the magnetic excitation coil 45 is located above the magnetic element 35, and the second long side 453 is located above the first long side 451 and away from the magnetic element 35. For each magnetic excitation coil 45, only the first long side 451 close to the magnetic element 35 is within the magnetic action range of its corresponding magnetic element 35. When the magnetic excitation coil 45 is energized, the first long side 451 interacts with the magnetic element 35 to generate a driving force, driving the movable carrier 40 to move in a plane perpendicular to the optical axis. In this embodiment, the principle of the interaction between the magnetic excitation coil 45 and the magnetic element 35 is as follows: Fig.13 As shown, Fig.13 The magnetic excitation coil 45 is Fig.11 The magnetic excitation coil 45 is one of a group of magnetic excitation coils 45 arranged along the X-axis direction, the Z-axis direction represents the direction of the optical axis of the lens, the magnetic north pole of the magnetic element 35 is arranged adjacent to the first long side 451 of the magnetic excitation coil 45, and the magnetic south pole of the magnetic element 35 is arranged away from the magnetic excitation coil 45. When the magnetic excitation coil 45 is energized, current continues to flow through the first long side 451 of the magnetic excitation coil 45. Fig.13 The direction of the current in the first long side 451 is perpendicular to the paper and inward, and the magnetic field direction of the magnetic north pole on the magnetic element 35 is shown by the magnetic flux lines. According to the left-hand rule, it can be determined that the first long side 451 is subjected to the Ampere force in the X direction; when Fig.13 When the current direction in the first long side 451 is changed to perpendicular to the paper plane and outward, the direction of the Ampere force on the first long side 451 is changed to the opposite direction of the X direction. Similarly, after the other group of magnetic excitation coils 45 arranged along the Y-axis direction are energized, they can be acted on by the Ampere force along the Y direction or the opposite direction of the Y direction, and the movable carrier 40 can be driven by the Ampere force to move in the XY plane. It can be seen that by controlling the direction and size of the current loaded into each magnetic excitation coil 45, the displacement direction and displacement amount of the movable carrier 40 can be accurately controlled, so that the movable carrier 40 moves in a plane perpendicular to the optical axis direction. It is easy to know that the magnetic south pole of the magnetic element 35 can also be arranged adjacent to the magnetic excitation coil 45, and the magnetic north pole of the magnetic element 35 can be arranged away from the magnetic excitation coil 45.

[0046] In the lens module provided in the present invention, the movable carrier 40 can also be suspended on the circuit board 30 through a tension spring ball type connection structure or a plane spring sheet type connection structure. Specifically, the movable carrier 40 can be suspended on the circuit board 30 through four groups of tension spring ball structures, one end of the tension spring in each group of tension spring ball structures is fixedly connected to the circuit board 30, and the other end is fixedly connected to the movable carrier 40, and the balls in each group of tension spring ball structures are installed on the side of the movable carrier 40 facing the circuit board 30, located between the movable carrier 40 and the bracket 50 or between the movable carrier 40 and other bases, so as to support the movable carrier 40 and play a role in limiting the height after sliding. When the current is loaded in the magnetic excitation coil 45, the movable carrier 40 is driven by the Ampere force, and moves in a plane perpendicular to the optical axis direction relative to the circuit board 30 through the sliding of the balls in the groove. When the current loaded in the magnetic excitation coil 45 is removed, the movable carrier 40 returns to its original position under the traction of the tension spring. In other embodiments, the number of groups of the tension spring ball structure can be increased or decreased according to specific needs. The number of the tension spring ball structure is not limited to four groups, as long as the movable carrier 40 can be suspended above the circuit board 30 in a balanced manner.

[0047] In another embodiment, the movable carrier 40 is suspended on the circuit board 30 by four planar spring sheets, the planar spring sheets include a first connection portion fixedly connected to the movable carrier 40 and a second connection portion fixedly connected to the circuit board 30, the first connection portion and the second connection portion are connected by an elastically deformable spring portion, a support column is provided on the circuit board 30 corresponding to each planar spring sheet, each support column is fixedly connected to the second connection portion of the corresponding planar spring sheet so that the movable carrier 40 is suspended above the circuit board 30. When current is loaded in the magnetic excitation coil 45, the movable carrier 40 is driven by the Ampere force and moves in a plane perpendicular to the optical axis relative to the circuit board 30. When the magnetic excitation coil 45 is powered off, the movable carrier 40 returns to its original position under the traction of the spring portion. In other embodiments, the planar spring sheet can be designed in the form of a whole sheet or in the form of two sheets, as long as the movable carrier 40 can be suspended above the circuit board 30 in a balanced manner and can move in a plane perpendicular to the optical axis.

[0048] In the lens module provided by the present invention, the connection structure 33 also plays the role of conductive connection, and one end of the power lead of the magnetic excitation coil 45 on the movable carrier 40 is electrically connected to the connection structure 33, and then the magnetic excitation coil 45 is electrically connected to the circuit board 30 through the connection structure 33 to achieve electrical connection with the circuit board 30. It is easy to imagine that the electrical connection between the magnetic excitation coil 45 and the circuit board 30 can also be achieved by setting a wire.

[0049] Fig.14The figure shows a three-dimensional structural diagram of a lens module according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the lens module includes a voice coil motor 13, the lens 10 is mounted on the voice coil motor 13, and the voice coil motor 13 is fixedly connected to the movable carrier 40. The lens module in this embodiment is an auto-focus lens module. Figures 14 to 17 The lens 10 is mounted on a voice coil motor 13 . Driven by the voice coil motor 13 , the lens 10 can move along the optical axis of the lens to achieve a focusing function. The base of the voice coil motor 13 is fixedly connected to the movable carrier 40 .

[0050] The voice coil motor 13 on the autofocus lens module is electrically connected to the movable carrier 40 through an electrical connection structure, and the movable carrier 40 is electrically connected to the circuit board 30 through a connection structure 33 such as a pull rod or a planar spring sheet, thereby realizing the electrical connection between the voice coil motor 13 and the circuit board 30. By respectively controlling the direction and magnitude of the current loaded into the voice coil motor 13 and the direction and magnitude of the current in the magnetic excitation coil 45 on the movable carrier 40, the autofocus lens module can simultaneously realize the autofocus function and the optical image stabilization function, thereby improving the quality of the captured image.

[0051] In the lens module provided by the present invention, the movable carrier 40 can be a metal part or a plastic part or a metal plus plastic part; the magnetic excitation coil 45 can be a copper wire winding or an FPCB etched coil; the combination of the movable carrier 40 and the magnetic excitation coil 45 can be a coil-sticking type, a coil-winding PIN type or a bracket-winding injection molding type.

[0052] The lens module provided by the present invention adds a movable carrier, a mechanical structure for realizing optical image stabilization, inside the module. By controlling the direction and magnitude of the current loaded into the magnetic excitation coil installed on the movable carrier, the moving direction and moving distance of the movable carrier can be controlled, thereby driving the lens to move a specific distance in a specific direction, compensating for the slight movement of the lens caused by hand shaking during photographing, stabilizing the optical path, and solving the problem of image blur caused by hand shaking during photographing. The invention is low in cost and easier to realize.

[0053] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A lens module, comprising a lens (10), an imaging chip (20) and a circuit board (30), wherein the imaging chip (20) is arranged on the circuit board (30), characterized in that: The lens module further comprises a movable carrier (40), a magnetic excitation coil (45) and a magnetic element (35); the movable carrier (40) is movably connected to the circuit board (30); the lens (10) is fixedly arranged on the movable carrier (40); the magnetic excitation coil (45) is arranged on the movable carrier (40); the magnetic element (35) is arranged on the circuit board (30); the magnetic excitation coil (45) and the magnetic element (35) can interact with each other to generate a driving force, thereby driving the movable carrier (40) to move in a plane perpendicular to the optical axis direction; the lens module further comprises a protective cover (60); the protective cover (60) comprises four rectangular side panels (63) fixedly connected to the circuit board (30); the four rectangular side panels (63) are connected in pairs and are arranged on the periphery of the magnetic element (35), and the tops of the four rectangular side panels (63) are bent and extended upward to form an upper baffle (65), and the upper baffle (65) covers the edge area around the movable carrier (40) to accommodate the magnetic element (35), the imaging chip (20) and the movable carrier (40) in sequence inside the lens module, and the four rectangular side panels (63) are spaced apart from the movable carrier (40) on all sides; the lens module also includes a voice coil motor (13), the lens (10) is installed in the voice coil motor (13), and can be moved along the optical axis of the lens under the drive of the voice coil motor (13), and the base of the voice coil motor (13) is fixedly connected to the movable carrier (40).

2. The lens module according to claim 1, characterized in that: The lens module comprises at least two magnetic excitation coils (45), the two magnetic excitation coils (45) are arranged in directions perpendicular to each other, a magnetic element (35) is correspondingly provided on the circuit board (30) relative to each magnetic excitation coil (45), and the directions of the driving forces generated by the interaction between the two magnetic excitation coils (45) and the corresponding magnetic elements (35) are perpendicular to each other.

3. The lens module according to claim 2, characterized in that: The lens module comprises four magnetic excitation coils (45) and four magnetic elements (35); the four magnetic excitation coils (45) are divided into two groups and arranged in mutually perpendicular directions, and the two magnetic excitation coils (45) in each group are arranged in parallel and spaced apart from each other; and the four magnetic elements (35) are arranged around the imaging chip (20).

4. The lens module according to claim 2, characterized in that: The magnetic excitation coil (45) is a rectangular coil formed by winding a core wire, comprising a first long side (451) and a second long side (453); the axis direction of the core wire of the magnetic excitation coil (45) is parallel to the optical axis of the lens; the first long side (451) is located above the magnetic element (35), and the second long side (453) is located on one side of the magnetic element (35); one magnetic pole of the magnetic element (35) is arranged adjacent to the magnetic excitation coil (45), and the other magnetic pole of the magnetic element (35) is arranged away from the magnetic excitation coil (45).

5. The lens module according to claim 2, characterized in that: The magnetic excitation coil (45) is a rectangular coil formed by winding a core wire, comprising a first long side (451) and a second long side (453); the axis direction of the winding of the core wire of the magnetic excitation coil (45) is perpendicular to the optical axis of the lens, and the axis directions of the winding of the core wires of the two magnetic excitation coils (45) are perpendicular to each other; the first long side (451) is located above the magnetic element (35), and the second long side (453) is located above the first long side (451); one magnetic pole of the magnetic element (35) is arranged adjacent to the magnetic excitation coil (45), and the other magnetic pole of the magnetic element (35) is arranged away from the magnetic excitation coil (45).

6. The lens module according to claim 1, characterized in that: The lens module further comprises a vibration sensing element and a controller, wherein the vibration sensing element senses the vibration of the lens (10), and the controller receives the signal sensed by the vibration sensing element and calculates the direction and magnitude of the current required to be loaded on each of the magnetic excitation coils (45), thereby controlling the movement of the movable carrier (40) to compensate for the vibration of the lens (10).

7. The lens module according to claim 1, characterized in that: The movable carrier (40) is movably connected to the circuit board (30) via a connecting structure (33), wherein the connecting structure (33) comprises a plurality of pull rods, and the movable carrier (40) is provided with a plurality of connecting positions (43) corresponding to the plurality of pull rods, and one end of each of the pull rods is fixedly connected to the circuit board (30), and the other end is fixedly connected to the connecting position (43); or, The connection structure (33) comprises a plurality of groups of tension spring ball structures, one end of the tension spring in each group of the tension spring ball structures is fixedly connected to the circuit board (30), and the other end is fixedly connected to the movable carrier (40), and the balls in each group of the tension spring ball structures are mounted on a side of the movable carrier (40) facing the circuit board (30) to support the movable carrier (40); or, The connection structure (33) comprises a planar spring sheet, the planar spring sheet comprising a first connection portion fixedly connected to the movable carrier (40) and a second connection portion fixedly connected to the circuit board (30), the first connection portion and the second connection portion being connected via an elastically deformable spring portion, a support column being provided on the circuit board (30) corresponding to the planar spring sheet, the support column being fixedly connected to the second connection portion of the corresponding planar spring sheet so that the movable carrier (40) is suspended above the circuit board (30).

8. The lens module according to claim 1, wherein: The lens module further comprises a bracket (50) and a filter (55) fixed to the bracket (50); the filter (55) is located on a side of the lens (10) close to the imaging chip (20); the bracket (50) is fixedly connected to the magnetic element (35); and the filter (55) is fixedly mounted above the imaging chip (20) via the bracket (50).

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