Voice coil motor for driving liquid lens and lens assembly with voice coil motor

Abstract

The present application provides a voice coil motor for driving a liquid lens and a lens assembly having a voice coil motor. The voice coil motor includes a plurality of sub-motor parts, which can be independently controlled, and the sub-motor parts include: a fixed part; a movable part that can move relative to the fixed part along the optical axis; a connecting spring that connects the liquid lens and the movable part respectively, and the movable part drives the connecting spring to squeeze the liquid lens when a force is applied in the optical axis direction, and the connecting spring is a leaf spring, and the stiffness coefficient of the connecting spring in the optical axis direction is greater than the stiffness coefficient of the connecting spring in the direction perpendicular to the optical axis; a driving circuit part that controls the moving distance of the movable part. The voice coil motor of the above technical solution can accurately realize automatic focusing and optical image stabilization of the liquid lens at the same time.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of lens driving devices, and more specifically, to a voice coil motor for driving a liquid lens and a lens assembly having the voice coil motor. Background Art

[0002] Auto focus (AF) uses the principle of light reflection from the object. The reflected light passes through the lens to form an image and is received on the image sensor. The object distance of the object is then obtained through computer processing, and the lens is automatically moved according to the object distance to complete the focusing.

[0003] Optical image stabilization (OIS) is a method of detecting shake using a gyroscope and then using the OIS motor to translate or rotate the entire lens in the opposite direction to compensate for image blur caused by device shake during exposure.

[0004] For traditional lenses, different motor components are usually used to drive the lens to move or rotate to achieve AF and OIS respectively. In order to meet people's demand for micro zoom lenses, a new type of optical element, namely liquid lens, has emerged that dynamically adjusts the refractive index of the lens or changes its surface shape to change the focal length and achieve optical image stabilization.

[0005] For liquid lenses, AF and OIS can be achieved simultaneously through the drive of the same motor assembly. However, the current driving device of the liquid lens cannot accurately control the displacement deformation of the liquid lens during autofocus and optical image stabilization, thus failing to achieve good autofocus and optical image stabilization effects. Summary of the invention

[0006] The embodiments of the present application provide a voice coil motor for driving a liquid lens and a lens assembly having the voice coil motor, which can accurately achieve automatic focusing and optical image stabilization of the liquid lens at the same time.

[0007] In a first aspect, a voice coil motor for driving a liquid lens is provided, wherein the voice coil motor comprises a plurality of sub-motor parts, and the plurality of sub-motor parts can be independently controlled, and the sub-motor parts comprise: a stationary part; a movable part movable relative to the stationary part along an optical axis; a connecting spring sheet, respectively connecting the liquid lens and the movable part, wherein the movable part drives the connecting spring sheet to squeeze the liquid lens when a force is applied in the direction of the optical axis, and the connecting spring sheet is a leaf spring, and a stiffness coefficient of the connecting spring sheet in the direction of the optical axis is greater than a stiffness coefficient of the connecting spring sheet in a direction perpendicular to the optical axis; and a driving circuit part, which controls the moving distance of the movable part.

[0008] The voice coil motor provided in the present application connects the liquid lens and the movable part of the voice coil motor through a connecting spring, so that the movable part of the voice coil motor can keep moving in a single direction when subjected to a certain force, and the multiple sub-motor parts of the voice coil motor can be independently controlled. The multiple sub-motor parts independently apply force to the liquid lens, which can more accurately control the displacement and deformation of the liquid lens, and can simultaneously realize automatic focus and optical image stabilization of the liquid lens.

[0009] In combination with the first aspect, in a possible implementation, the stationary part includes a motor base part, a coil fixed on the motor base part, and a circuit board, wherein the coil is fixed on the circuit board and electrically connected to the circuit board; the movable part includes a magnet arranged opposite to the coil.

[0010] In combination with the first aspect, in a possible implementation, the movable part also includes a U-shaped magnetic isolation plate, the magnet is fixed on the inner wall of the U-shaped magnetic isolation plate, and the magnetic isolation space formed by the U-shaped magnetic isolation plate also accommodates the coil and the circuit board; the lower part of the connecting spring is fixedly connected to the outer wall of the U-shaped magnetic isolation plate.

[0011] The U-shaped magnetic isolation sheet can reduce the leakage magnetic field generated when the magnet and coil are energized, and can increase the motor thrust.

[0012] In combination with the first aspect, in a possible implementation, the stationary part includes a motor base part and a magnet fixed relative to the motor base part; the movable part includes a circuit board and a coil fixed on the circuit board, and the coil is arranged relative to the magnet.

[0013] By making the magnet fixed and the coil movable, the weight of the movable part can be reduced and the mechanical reliability of the voice coil motor can be improved.

[0014] In combination with the first aspect, in a possible implementation, the stationary part also includes a U-shaped magnetic isolation plate, the magnet is fixed on the inner wall of the U-shaped magnetic isolation plate, and the magnetic isolation space formed by the U-shaped magnetic isolation plate also accommodates the coil and the circuit board; the lower part of the connecting spring sheet is fixedly connected to the circuit board, and the side wall of the U-shaped magnetic isolation plate has an opening along the optical axis direction, and the connecting spring sheet drives the circuit board to move through the opening.

[0015] The U-shaped magnetic isolation sheet can reduce the leakage magnetic field generated when the magnet and coil are energized, and can increase the motor thrust.

[0016] In combination with the first aspect, in a possible implementation, the motor base parts of the multiple sub-motor parts form an integral motor base.

[0017] In combination with the first aspect, in a possible implementation, the driving circuit part includes a driving and Hall integrated chip, and the driving and Hall integrated chip is located at the center of the coil and fixed on the circuit board to realize closed-loop control of the moving distance of the movable part.

[0018] By using a drive and Hall integrated chip to perform closed-loop control on the displacement of the movable part of the voice coil motor, the displacement of the movable part can be controlled more accurately, thereby more accurately controlling the displacement and deformation of the liquid lens, achieving better autofocus and optical image stabilization effects.

[0019] In combination with the first aspect, in a possible implementation, the driving circuit part also includes a microcontroller unit MCU, which obtains autofocus instructions and / or optical image stabilization instructions, and outputs motor displacement instructions to the driving and Hall integrated chip after calculation through superposition and fusion algorithms, so as to perform closed-loop control of the sub-motor part.

[0020] Since the movable part of the voice coil motor moves in a single direction, namely the direction of the optical axis, a motor displacement instruction is obtained by superimposing and fusing the instructions for autofocus and the instructions for optical image stabilization. Autofocus and optical image stabilization can be achieved simultaneously by executing the motor displacement instruction.

[0021] In combination with the first aspect, in a possible implementation, the sub-motor part also includes an extrusion component part, the extrusion component part includes an arc-shaped extrusion portion and an ear portion arranged on the circumference of the arc-shaped extrusion portion, and the connecting spring piece is connected to the ear portion of the extrusion component part.

[0022] In combination with the first aspect, in a possible implementation, the arc-shaped extrusion portions of the multiple sub-motor parts form an integral annular extrusion portion.

[0023] In combination with the first aspect, in a possible implementation, the sub-motor part also includes an upper supporting spring sheet and a lower supporting spring sheet for supporting and suspending the movable part, wherein one end of the upper supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part; one end of the lower supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part.

[0024] The upper supporting spring sheet and the lower supporting spring sheet of the voice coil motor can control the movable part of the voice coil motor not to be displaced in the direction perpendicular to the optical axis, thereby enabling the movable part to move in a single direction.

[0025] In combination with the first aspect, in a possible implementation, the upper supporting springs of the multiple sub-motor parts form an integrated upper supporting spring; and / or the lower supporting springs of the multiple sub-motor parts form an integrated lower supporting spring.

[0026] In combination with the first aspect, in a possible implementation manner, the multiple sub-motor parts are distributed on four sides of the voice coil motor around the optical axis.

[0027] In combination with the first aspect, in a possible implementation manner, the maximum driving force generated by the coil and the magnet is smaller than the force causing the connecting spring to deform in the direction of the optical axis.

[0028] In a second aspect, a lens assembly is provided, comprising a liquid lens and a voice coil motor for driving the liquid lens, wherein the voice coil motor comprises a plurality of sub-motor parts, and the plurality of sub-motor parts can be independently controlled, and the sub-motor parts comprise: a stationary part; a movable part movable relative to the stationary part along an optical axis; a connecting spring sheet, respectively connecting the liquid lens and the movable part, wherein the movable part drives the connecting spring sheet to squeeze the liquid lens when a force is applied in the direction of the optical axis, and the connecting spring sheet is a leaf spring, and a stiffness coefficient of the connecting spring sheet in the direction of the optical axis is greater than a stiffness coefficient of the connecting spring sheet in a direction perpendicular to the optical axis; and a driving circuit part, which controls the moving distance of the movable part.

[0029] The voice coil motor provided in the present application connects the liquid lens and the movable part of the voice coil motor through a connecting spring, so that the movable part of the voice coil motor can keep moving in a single direction when subjected to a certain force, and the multiple sub-motor parts of the voice coil motor can be independently controlled. The multiple sub-motor parts independently apply force to the liquid lens, which can more accurately control the displacement and deformation of the liquid lens, and can simultaneously realize automatic focus and optical image stabilization of the liquid lens.

[0030] In combination with the second aspect, in a possible implementation, the stationary part includes a motor base part, a coil fixed on the motor base part, and a circuit board, wherein the coil is fixed on the circuit board and electrically connected to the circuit board; the movable part includes a magnet arranged opposite to the coil.

[0031] In combination with the second aspect, in a possible implementation, the movable part also includes a U-shaped magnetic isolation plate, the magnet is fixed on the inner wall of the U-shaped magnetic isolation plate, and the magnetic isolation space formed by the U-shaped magnetic isolation plate also accommodates the coil and the circuit board; the lower part of the connecting spring is fixedly connected to the outer wall of the U-shaped magnetic isolation plate.

[0032] The U-shaped magnetic isolation sheet can reduce the leakage magnetic field generated when the magnet and coil are energized, and can increase the motor thrust.

[0033] In combination with the second aspect, in a possible implementation, the stationary part includes a motor base part and a magnet fixed relative to the motor base part; the movable part includes a circuit board and a coil fixed on the circuit board, and the coil is arranged relative to the magnet.

[0034] In combination with the second aspect, in a possible implementation, the stationary part also includes a U-shaped magnetic isolation plate, the magnet is fixed on the inner wall of the U-shaped magnetic isolation plate, and the magnetic isolation space formed by the U-shaped magnetic isolation plate also accommodates the coil and the circuit board; the lower part of the connecting spring sheet is fixedly connected to the circuit board, and the side wall of the U-shaped magnetic isolation plate has an opening along the optical axis direction, and the connecting spring sheet drives the circuit board to move through the opening.

[0035] The U-shaped magnetic isolation sheet can reduce the leakage magnetic field generated when the magnet and coil are energized, and can increase the motor thrust.

[0036] In combination with the second aspect, in a possible implementation, the motor base parts of the multiple sub-motor parts form an integral motor base.

[0037] In combination with the second aspect, in a possible implementation, the driving circuit part includes a driving and Hall integrated chip, and the driving and Hall integrated chip is located at the center of the coil and fixed on the circuit board to realize closed-loop control of the moving distance of the movable part.

[0038] By using a drive and Hall integrated chip to perform closed-loop control on the displacement of the movable part of the voice coil motor, the displacement of the movable part can be controlled more accurately, thereby more accurately controlling the displacement and deformation of the liquid lens, achieving better autofocus and optical image stabilization effects.

[0039] In combination with the second aspect, in a possible implementation, the driving circuit part also includes a microcontroller unit MCU, which obtains autofocus instructions and / or optical image stabilization instructions, and outputs motor displacement instructions to the driving and Hall integrated chip through superposition and fusion algorithms, for closed-loop control of the sub-motor part.

[0040] Since the movable part of the voice coil motor moves in a single direction, namely the direction of the optical axis, a motor displacement instruction is obtained by superimposing and fusing the instructions for autofocus and the instructions for optical image stabilization. Autofocus and optical image stabilization can be achieved simultaneously by executing the motor displacement instruction.

[0041] In combination with the second aspect, in a possible implementation, the sub-motor part also includes an extrusion component part, the extrusion component part includes an arc-shaped extrusion portion and an ear portion arranged on the circumference of the arc-shaped extrusion portion, and the connecting spring piece is connected to the ear portion of the extrusion component part.

[0042] In combination with the second aspect, in a possible implementation, the arc-shaped extrusion portions of the multiple sub-motor parts form an integral annular extrusion portion.

[0043] In combination with the second aspect, in a possible implementation, the sub-motor part also includes an upper supporting spring sheet and a lower supporting spring sheet for supporting and suspending the movable part, wherein one end of the upper supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part; one end of the lower supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part.

[0044] The upper supporting spring sheet and the lower supporting spring sheet of the voice coil motor can control the movable part of the voice coil motor not to be displaced in the direction perpendicular to the optical axis, thereby enabling the movable part to move in a single direction.

[0045] In combination with the second aspect, in a possible implementation, the upper supporting springs of the multiple sub-motor parts form an integrated upper supporting spring; and / or the lower supporting springs of the multiple sub-motor parts form an integrated lower supporting spring.

[0046] In combination with the second aspect, in a possible implementation, the multiple sub-motor parts are distributed on four sides of the voice coil motor around the optical axis.

[0047] In combination with the second aspect, in a possible implementation manner, the maximum driving force generated by the coil and the magnet is smaller than the force causing the connecting spring to deform in the direction of the optical axis.

[0048] In combination with the second aspect, in a possible implementation, the lens assembly also includes a housing, which cooperates with the motor base part of the multiple sub-motor parts and has an opening, and the space formed by the housing and the motor base part of the multiple sub-motor parts is used to accommodate the voice coil motor and the liquid lens.

[0049] In combination with the second aspect, in a possible implementation manner, the lens assembly further includes a liquid lens support frame, the housing is provided with a support plate, and the support plate is connected to the support frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the principle of automatic focusing and optical image stabilization of the liquid lens of an embodiment of the present application.

[0051] Figure 2 This is an axonometric assembly diagram of a lens assembly according to an embodiment of the present application.

[0052] Figure 3 It is an exploded perspective view of a lens assembly according to an embodiment of the present application.

[0053] Figure 4 It is a bottom exploded perspective view of a lens assembly according to an embodiment of the present application.

[0054] Figure 5 Detailed description of the invention Figure 4 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention.

[0055] Figure 6 It is an exploded perspective view of a lens assembly according to another embodiment of the present application.

[0056] Figure 7 It is an exploded perspective view of a voice coil motor according to another embodiment of the present application.

[0057] Figure 8 It is a schematic diagram of the working principle of the voice coil motor automatic focusing according to an embodiment of the present application.

[0058] Fig. 9 It is a schematic diagram of the working principle of the voice coil motor optical image stabilization according to an embodiment of the present application.

[0059] Fig.10 It is a schematic structural diagram of the connecting spring piece of an embodiment of the present application.

[0060] Fig.11 It is a schematic block diagram of the line connection of an embodiment of the present application.

[0061] Fig.12 It is a schematic diagram of the control flow of voice coil motor autofocus and optical image stabilization according to an embodiment of the present application. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0063] In application scenarios such as taking photos and videos, it is often necessary to change the focus position of the camera or lens to achieve autofocus and optical image stabilization.

[0064] Auto focus (AF) uses the principle of light reflection from the object. The light reflected by the object is imaged and received on the image sensor after passing through the lens. The object distance of the object is obtained through computer processing, and then the lens is automatically moved according to the object distance to complete the focusing.

[0065] Optical image stabilization (OIS) refers to the use of optical components, such as lens settings, in imaging instruments such as cameras to avoid or reduce instrument jitter during the capture of optical signals in order to improve image quality. A common approach is to use a gyroscope to detect jitter, and then use the OIS motor to translate or rotate the entire lens in the opposite direction to compensate for image blur caused by imaging instrument jitter during exposure.

[0066] When traditional lenses are performing autofocus and optical image stabilization, achieving optical zoom requires the lens to move a certain distance or rotate a certain angle as a whole, and the autofocus and optical image stabilization of the lens are achieved through different motor components. In order to meet people's demand for miniaturization of cameras, a new type of optical element has emerged that can dynamically adjust the refractive index of the lens or change its surface shape (curvature) to change the focal length and achieve optical image stabilization, namely the liquid lens.

[0067] Liquid lens is a liquid lens with variable curvature. It is an optical element without mechanical connection made of one or more liquids. The internal parameters of the optical element can be changed through external control. It has performance that traditional optical lenses cannot match. Figure 1 The principle of liquid lens autofocus and optical image stabilization is shown.

[0068] When the liquid lens is automatically focused, the liquid lens can be squeezed by a motor or electrostatic force in a small space and size, so that the shape of its surface (i.e., the refractive surface) changes relatively evenly, thereby achieving the focus moving up and down along the center of the optical axis. Figure 1 As shown in (a) and (b), a squeezing component 101 is provided on one side of the refractive surface of the liquid lens 102. When autofocusing is performed, the squeezing component 101 moves toward the liquid lens 102 along the optical axis under the action of the motor driving force, thereby squeezing the liquid lens 102. After the periphery of the liquid lens 102 is uniformly squeezed, the lens surface becomes more curved, and the refraction angle of the light L increases after passing through the liquid lens 102, so that the focus moves upward along the center of the optical axis. From the figure, after the liquid lens 102 is automatically focused, the focus moves from the focus Fa in (a) to the focus Fb in (b), and both the focus Fa and the focus Fb are located at the center of the optical axis.

[0069] When the liquid lens is optically image-stabilized, the lens can be squeezed by a motor or electrostatic force to make the shape of its surface (i.e., the refractive surface) change relatively unevenly, thereby causing the focus to deviate from the center of the optical axis. Figure 1As shown in (c) and (d), a squeezing component 101 is provided on one side of the refractive surface of the liquid lens 102. When optical image stabilization is performed, the squeezing component 101 moves toward the liquid lens 102 under the action of the motor driving force, thereby squeezing the liquid lens 102. Since the squeezing component 101 moves at different distances at multiple positions of the liquid lens, the periphery of the liquid lens 102 is unevenly squeezed, the curvature of the lens surface is inconsistent, and the light L symmetrical with respect to the optical axis has different refraction angles after passing through the liquid lens 102, causing the focus to shift from the center of the optical axis. The jitter of the imaging instrument during exposure is reversely compensated by the shift in focus, so as to achieve the purpose of clear imaging. As can be seen from the figure, after optical image stabilization, the focus of the liquid lens 102 shifts from the focus Fc in (c) to the focus Fd in (d).

[0070] When the lens is autofocusing or optically image stabilizing, a voice coil motor (VCM) is usually used to drive the lens to translate or rotate. In the voice coil motor used to drive the lens, the movement direction of the movable part that drives the lens to move for autofocus is often different from the movement direction for optical image stabilization. For example, for a traditional lens, the movement of the movable part along the optical axis can make the lens translate along the optical axis to achieve autofocus, and the swinging movement of the movable part in the direction perpendicular to the optical axis can make the lens rotate to achieve optical image stabilization. Therefore, this type of voice coil motor requires a larger internal space to meet the movement of the movable part in different directions, and the motor components used to achieve autofocus and optical image stabilization need to be controlled separately; For liquid lenses, the movable part moves along the optical axis direction so that the refractive surface of the liquid lens is uniformly squeezed to achieve autofocus, and the refractive surface of the liquid lens is unevenly squeezed to achieve optical image stabilization. Although autofocus and optical image stabilization can be achieved simultaneously through the same set of motor components, when the movable part of the motor is used for optical image stabilization, since the refractive surface of the liquid lens needs to be unevenly squeezed, the movable part of the motor used to squeeze the liquid lens, such as the relatively arranged movable part of the motor, has different displacements in the direction of the optical axis, which will cause the movable part of the motor to be displaced in the direction perpendicular to the optical axis. After the motor assembly is tilted, the spacing between the movable part (such as the coil) and the stationary part (such as the magnet) will change, and the electromagnetic force used to push the movable part will also change accordingly, resulting in the inability to accurately control the displacement of the movable part of the motor in the vertical direction. Therefore, no matter what kind of lens is used, when performing optical image stabilization and / or autofocus, the displacement or deformation of the lens cannot be more accurately controlled.

[0071] The embodiment of the present application provides a voice coil motor for driving a liquid lens, which can accurately control the deformation displacement of the liquid lens and can simultaneously achieve autofocus and optical image stabilization.

[0072] It should be understood that the voice coil motor of the embodiment of the present application is not limited to driving a liquid lens, but can also be used to drive a traditional lens. The embodiment of the present application is described by taking the voice coil motor driving a liquid lens as an example.

[0073] Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0074] Figure 2 An axonometric assembly view of the lens assembly is shown.

[0075] The lens assembly A has an AF function and an OIS function, and can capture images without blurring the image by automatically focusing and optically image stabilizing when capturing an object. As shown in the figure, the lens assembly A mainly includes a voice coil motor 1, a liquid lens subassembly 2, and a housing 20. The voice coil motor 1 is used to convert electrical energy into mechanical energy, and utilizes the interaction between the magnetic poles in the magnetic field generated by the magnetic field from the permanent magnet and the energized coil conductor to generate regular motion, such as linear or limited swing angle motion, thereby driving the motion of the liquid lens in the liquid lens subassembly 2.

[0076] For the convenience of description, the optical axis direction of the lens is defined as the Z direction, the side of the optical axis in the direction of the object is the front side, the side opposite to the object is the rear side, the first direction perpendicular to the optical axis is the X direction, and the Figure 2 In the middle, the X direction is Figure 2 The side of the voice coil motor 1 in the lower left corner is parallel, and the second direction perpendicular to the optical axis and the first direction is the Y direction. Figure 2 In the middle, the Y direction is Figure 2 The sides of the voice coil motor 1 in the lower right corner are parallel, the direction close to the optical axis in the X and Y directions is the inner side, and the direction opposite to the optical axis is the outer side. Similarly, the definitions of the X, Y, Z directions and the front, back, inner, and outer sides also apply to the drawings to be described later.

[0077] It should be noted that the above definitions of the X, Y, Z directions and the front, rear, inside, and outside are only for the convenience of describing the positional relationship or connection relationship between the various components of the voice coil motor of the embodiment of the present application, and do not limit the embodiment of the present application.

[0078] It should also be noted that, for the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the same figure marks apply to other identical parts or components.

[0079] Figure 3 and Figure 4 An exploded perspective view of the lens assembly A is shown. Figure 3 This is an exploded perspective view. Figure 4 This is an exploded perspective view.

[0080] The voice coil motor 1 of the embodiment of the present application includes a plurality of sub-motor parts, and the plurality of sub-motor parts can be controlled independently, for example, by inputting control instructions to the plurality of sub-motor parts to realize independent movement of the plurality of sub-motor parts, etc.; the plurality of sub-motor parts can also be controlled as a whole, for example, by inputting the same instruction to the plurality of sub-motor parts to control the synchronous movement of the plurality of sub-motor parts; of course, the same instruction can also be input to several of the plurality of sub-motor parts to control the movement of the several sub-motor parts. In other words, the plurality of sub-motor parts can be independently controlled to move individually, the plurality of sub-motor parts can be controlled to move together, or the plurality of sub-motor parts can be divided into multiple groups, so as to independently control the plurality of groups of sub-motor parts.

[0081] Each sub-motor part mainly includes a motor base part 11, a circuit board 12, a magnet 13, a coil 14, a U-shaped magnetic isolation sheet 15, a lower supporting spring sheet 16, an upper supporting spring sheet 17, a connecting spring sheet 18, and an extrusion component part 19.

[0082] It should be noted that the voice coil motor of the embodiment of the present application includes a plurality of sub-motor parts, that is, the voice coil motor includes at least two sub-motor parts. Figure 3 , Figure 4 In the following figures, in order to clearly show the various components of the sub-motor part, figure marks are marked on multiple sub-motor parts to describe one of the sub-motor parts, but it should be understood that, unless otherwise specified, the content described by the figure marks in the figure is for describing one of the sub-motor parts.

[0083] In the embodiment of the present application, the voice coil motor includes four sub-motor parts, and the four sub-motor parts are respectively located on the four sides of the voice coil motor. It should be understood that in some other embodiments, the voice coil motor may include other numbers of sub-motor parts, such as 2, 3, 6, 8 or more.

[0084] The voice coil motor 1 is generally in the shape of a cube, and the space formed by the housing 20 and the motor base portion 11 of the plurality of sub-motor portions is used to accommodate other components of the voice coil motor or other components of the lens assembly A. Figure 5 That is, an exploded perspective view of the voice coil motor is shown. Figure 5 Describe the structure of the voice coil motor in detail.

[0085] The motor base portion 11 includes a substrate portion 111a and a coil fixing base 112. The motor base portion 11 is located at the rear side of the voice coil motor in the optical axis direction, and can also be considered to be located at the bottom layer of the voice coil motor, and is used to support the corresponding sub-motor part structure. The motor base portion 11 of multiple sub-motor parts is used to support the entire motor and module structure.

[0086] The coil fixing base 112 is disposed at both ends of the front end surface of the base plate portion 111a, and is used to fix the coil 14 and the upper supporting spring sheet 17. The coil fixing base 112 is provided with a coil fixing column, which is used to fix the coil 14. Figure 5 As shown, the coil fixing base 112a is provided with a coil fixing post 1122, and the coil fixing base 112c is provided with a coil fixing post 1124, the coil fixing post 1122 fixes one end of the coil 14, and the coil fixing post 1124 fixes the other end of the coil 14. In the embodiment of the present application, the coil fixing base 112a provided with the coil fixing post 1122, the coil fixing base 112c provided with the coil fixing post 1124, and the base plate portion 111a for supporting and fixing the coil fixing base 112a and the coil fixing base 112c can constitute a motor base portion 11 of a sub-motor portion.

[0087] Preferably, the motor base parts 11 of the multiple sub-motor parts can form an integrated motor base, that is, the substrate parts 111a of the multiple motor base parts can form an integrated substrate, and adjacent sub-motor parts can share a coil fixing base, etc. In the embodiment of the present application, the voice coil motor using an integrated motor base is used as an example for description, and it should be understood that other structures provided on the integrated motor base can also be applicable to the motor base parts of multiple sub-motors.

[0088] For an integrated motor base, it may include an integrated substrate 111 and a coil fixing base 112, such as Figure 5 As shown, the integral substrate 111 is generally square, with a hole formed in the middle. The coil fixing base 112 is arranged at the four corners of the front end surface of the integral substrate 111. The coil fixing base 112a is provided with coil fixing posts 1121 and 1122 on the side parallel to the optical axis direction. In a specific implementation, the coil fixing post 1121 on the coil fixing base 112a can fix the two ends of one coil 14 with the coil fixing post 1123 on another adjacent coil fixing base 112b, and the coil fixing post 1122 on the coil fixing base 112a can fix the two ends of another coil 14 with the coil fixing post 1124 on another adjacent coil fixing base 112c.

[0089] Of course, in other implementations, the coil fixing base 112 may also be set at other positions of the integral substrate 111, for example, on the four sides of the integral substrate 111; the number of coil fixing bases 112 set on the integral substrate 111 is not limited to 4, and other numbers of coil fixing bases 112 may also be set, such as 8; and the number of coil fixing columns on each coil fixing base 112 is not limited to two, and other numbers of coil fixing columns may also be set.

[0090] In other implementations, the coil fixing column for fixing the coil 14 may also be a hook type or a prism type or other forms that can fix the coil 14 .

[0091] The coil fixing base 112 may be formed integrally with the integral substrate 111 , or may be connected to the integral substrate 111 by welding or bonding.

[0092] Optionally, the coil fixing base 112 may be a rectangular parallelepiped, a triangular prism, a quadrangular prism, a polygonal prism, a cylinder, etc., which is not limited in the embodiment of the present application.

[0093] Optionally, a boss 113 may be further provided on the integral substrate 111 to support the lower supporting spring sheet 16 .

[0094] The coil 14 may be a ring coil, and its two long sides are perpendicular to the optical axis. Corresponding to the number of the four sub-motor parts, the four coils 14 are distributed on the four sides of the voice coil motor, and the two ends of each coil 14 are respectively fixed to the coil fixing posts on the two adjacent coil fixing bases 112. Taking one of the coils 14 as an example, its two ends 141a and 141b are respectively fixed to the coil fixing post 1123 on the coil fixing base 112b and the coil fixing post 1121 on the coil fixing base 112a.

[0095] In other implementations, the coil 14 is not limited to a ring-shaped coil, but may be of other shapes; the number of coils 14 in each sub-motor part is not limited to one, for example, it may be 2, 4 or more, and the appropriate shape and number of coils 14 can be matched according to the setting of the coil fixing base 112.

[0096] In order to achieve precise control of the displacement and deformation of the liquid lens, the voice coil motor of the embodiment of the present application can use a drive and Hall integrated IC 142 for closed-loop control. The drive and Hall integrated IC 142 is located in the middle of the coil 14, and is used to detect the displacement of the voice coil motor and drive the voice coil motor to move according to the detection result.

[0097] The circuit board 12 is arranged on the outside of the drive and Hall integrated IC 142, which is equivalent to the circuit board 12 being located on the outside of the coil 14. The circuit board 12 and the drive and Hall integrated IC 142 can be connected by welding, and the coil 14 is fixed on the circuit board 12 and electrically connected to the circuit board 12, so as to realize the electrical connection of the drive and Hall integrated IC 142 and the routing of the coil 14. As shown in the figure, the drive and Hall integrated IC 142 can be welded to the inner side 121 of the circuit board 12, and the coil 14 is opposite to the inner side 121 of the circuit board 12.

[0098] In some implementations, the circuit board 12 may be a flexible printed circuit board (FPCB) or a printed circuit board (PCB) or other electronic devices that can implement coil routing.

[0099] In some implementations, the circuit boards 12 corresponding to all coils 14 of multiple sub-motor parts can be integrated or separated.

[0100] In some implementations, the circuit board 12 and the integrated driver and Hall IC 142 may be connected via a patch. The welding method may adopt a reflow soldering process. The integrated driver and Hall IC 142 may also be provided with a solder pad and a motor terminal output.

[0101] Optionally, the circuit board 12 may be connected to an external driving circuit of the voice coil motor through the connection portion 123 .

[0102] The motor base portion 11 and the coil fixing base 112, coil 14, and circuit board 12 arranged thereon described above can be regarded as fixed parts whose positions remain unchanged relative to the liquid lens subassembly 2 during the process of adjusting the liquid lens.

[0103] A magnet 13 is arranged on the inner side of the coil 14 near the motor cavity to provide a magnetic field. The magnet 13 includes an N pole 131 and an S pole 132 arranged relatively front and back in the direction of the optical axis. A person of ordinary skill in the art will know that the N pole and S pole of the magnet can be arranged according to the required magnetic field direction, and is not limited to the N pole being in front of the S pole in the embodiment of the present application. The magnet 13 is fixed on the inner side surface 152 of the inner side wall of the U-shaped magnetic isolation plate 15, located on the inner side of the coil 14, opposite to the coil 14. The coil 14 is in the magnetic field of the magnet 13. When the coil 14 is energized, under the action of the magnetic field, the coil 14 and the magnet 13 will produce relative motion under the action of the Ampere force. Since the coil 14 is fixed on the coil fixing base 112, under the action of the magnetic field, the magnet 13 will move relative to the coil 14 along the optical axis.

[0104] The opening of the U-shaped magnetic isolation sheet 15 faces backwards, and the magnetic isolation space between the inner side surface 152 of the inner wall of the U-shaped magnetic isolation sheet 15 and the inner side surface 153 of the outer wall accommodates the magnet 13, the coil 14, the drive and Hall integrated IC 142, and the circuit board 12 from the inside to the outside. The inner side surface 153 of the outer wall of the U-shaped magnetic isolation sheet 15 is opposite to the outer side surface 122 of the circuit board 12, and the outer side surface 154 of the outer wall of the U-shaped magnetic isolation sheet 15 is opposite to the inner wall of the housing 20. For the voice coil motor, corresponding to the setting of the coil 14, each sub-motor part has a U-shaped magnetic isolation sheet, and the U-shaped magnetic isolation sheets 15 of multiple sub-motor parts are distributed perpendicular to the optical axis on the four sides of the motor to reduce the leakage magnetic field generated when the magnet and the coil are energized, thereby increasing the motor thrust. A person skilled in the art can know that the U-shaped magnetic isolation sheet 15 can be set accordingly according to the setting method of the coil 14, without limiting the method listed in the embodiment of the present application.

[0105] A connecting spring piece 18 is fixed on the outer side surface 151 of the inner side wall of the U-shaped magnetic isolation piece 15 . The connecting spring piece 18 can play the role of connection, power transmission and buffering.

[0106] The connecting spring 18 is in the form of a sheet, one end of which is fixed to the outer side surface 151 of the inner side wall of the U-shaped magnetic isolation sheet 15, and the other end is connected to the extrusion component 19. The four connecting springs 181a, 181b, 181c, and 181d in the embodiment of the present application are distributed on the four sides of the voice coil motor, corresponding to the distribution of multiple sub-motor parts, and each connecting spring is correspondingly connected to a U-shaped magnetic isolation sheet 15. Taking the connecting spring 181a as an example, its second connecting portion 1812 is connected to the outer side surface 151 of the inner side wall of the U-shaped magnetic isolation sheet 15, and its first connecting portion 1811 is connected to the extrusion component 19. A person skilled in the art can know that the position and number of the connecting springs 18 can be set accordingly according to the setting of the coil 14 or the magnet 13. The embodiment of the present application is not limited to each sub-motor part having one connecting spring, which is equivalent to not limiting the total number of connecting springs 18 of multiple sub-motor parts to 4, nor limiting the specific connection position of the connecting spring.

[0107] In some possible implementations, other shapes of magnetic isolation plates may be used to replace the U-shaped magnetic isolation plate 15 in the voice coil motor to prevent or reduce magnetic leakage between the magnet and the coil.

[0108] In some possible implementations, the voice coil motor may not include the U-shaped magnetic isolation sheet 15 , and the magnet may be connected to the connecting spring sheet 18 through other components, or directly connected to the connecting spring sheet 18 .

[0109] The connecting spring 18 can be a leaf spring, which has a larger stiffness coefficient in the direction of the optical axis, that is, it has a larger stiffness in the direction of the optical axis and a smaller stiffness coefficient in the direction perpendicular to the optical axis. When the motor driving force received by the connecting spring is within the preset motor driving force threshold, the connecting spring 18 is only allowed to deform slightly in the direction perpendicular to the optical axis. Therefore, the connecting spring 18 can be used to transmit the driving force to the extrusion component part 19, drive the extrusion component part 19 to move, and ensure that the voice coil motor moves in a single direction; when the force received by the connecting spring 18 in the direction of the optical axis exceeds the preset motor driving force threshold, the connecting spring 18 can bend and deform greatly in the direction perpendicular to the optical axis. When the force received in the direction of the optical axis disappears or is less than the preset motor driving force threshold, the connecting spring 18 returns to its original state. Therefore, the connecting spring 18 can also play a buffering role when the force received in the direction of the optical axis is large, so as to protect other modules or lens components inside the voice coil motor. The following will be combined with Figure 8 and Fig. 9 The working process of the connecting spring 18 is described, which will not be described in detail here.

[0110] The extrusion component part 19 includes an ear 191 and an extrusion part 192, wherein the ear 191 is arranged on the periphery of the extrusion part 192 and is connected to the first connection part 1811 of the connecting spring 18; the extrusion part 192 is generally arc-shaped, and its front end surface 1921 is close to the rear side of the liquid lens 21, and is used to squeeze the liquid lens to deform it, thereby changing the light input path to achieve autofocus and optical image stabilization. In the embodiment of the present application, the four ears 191a, 191b, 191c, and 191d of the four extrusion component parts 19 are connected to the four connecting springs 18. A person skilled in the art can know that the ear 191 of the extrusion component part 19 can be set accordingly according to the setting method of the connecting spring.

[0111] In some implementations, a claw is provided on the first connection portion 1811 of the connecting spring 18 , and a hole is provided on the ear 191 , into which the claw is inserted. The claw drives the ear 191 , so that the squeezing portion 192 squeezes the liquid lens 21 .

[0112] Preferably, the extrusion component parts 19 of multiple sub-motor parts can constitute an integral extrusion component. In the embodiment of the present application, an integral extrusion component is taken as an example. As shown in the figure, an integral extrusion component includes an annular extrusion portion and an ear portion arranged on the circumference of the annular extrusion portion.

[0113] The magnet 13 and the U-shaped magnetic isolation sheet 15 mentioned above can be regarded as movable parts that can move relative to the liquid lens subassembly 2 during the process of adjusting the liquid lens.

[0114] In the embodiment of the present application, the sub-motor part of the voice coil motor 1 further includes a lower supporting spring sheet 16 and an upper supporting spring sheet 17, which are used to support and suspend the movable part. One end of the lower supporting spring sheet and the upper supporting spring sheet are fixed to the movable part, and the other end is fixed to the fixed part. Taking the voice coil motor shown in the figure as an example, one end 161 of the lower supporting spring sheet 16 is fixed to the motor base part 11, and the other end 162 is fixed to the U-shaped magnetic isolation sheet 15, which is used to support the lower end of the U-shaped magnetic isolation sheet 15. For example, one end 161 of the lower supporting spring sheet 16 can be fixed to the integral substrate 111 or the boss 113, and the other end 162 is fixed to the side surface of the side wall of the U-shaped magnetic isolation sheet 15 or the rear end surface of the side wall. One end 171 of the upper supporting spring sheet 17 is fixed to the motor base portion 11, and the other end 172 is fixed to the top of the U-shaped magnetic isolation sheet 15, and is used to support the upper end of the U-shaped magnetic isolation sheet 15. For example, one end 171 of the upper supporting spring sheet 17 is fixed to the coil fixing base 112, and the other end 172 is fixed to the front end surface 155 of the U-shaped magnetic isolation sheet 15. The stiffness coefficient of the upper supporting spring sheet 17 and the lower supporting spring sheet 16 in the direction perpendicular to the optical axis is large, and the stiffness coefficient in the direction of the optical axis is small, so the deformation of the upper supporting spring sheet 17 and the lower supporting spring sheet 16 in the direction perpendicular to the optical axis is very small, and a large deformation can occur in the direction of the optical axis, so the movable part can only move along the optical axis when subjected to force, but cannot move in the direction perpendicular to the optical axis.

[0115] In some implementations, the upper supporting springs of multiple sub-motor parts can form an integrated upper supporting spring, and the lower supporting springs of multiple sub-motor parts can also form an integrated lower supporting spring. The integrated upper supporting spring and / or the integrated lower supporting spring are used to support and suspend the movable parts of the multiple sub-motor parts.

[0116] The upper supporting spring sheet 17 and the lower supporting spring sheet 16 described above can be regarded as supporting members for supporting and suspending during the process of adjusting the liquid lens. Of course, the supporting members can adopt any connection method known to those skilled in the art to realize a parallelogram anti-dumping structure.

[0117] The housing 20 is generally in the shape of a square with four sides closed, and an opening is provided at the top. A support plate 201 is provided on the housing 20, and the support plate 201 is connected to the liquid lens subassembly 2 to support the liquid lens subassembly 2. The support plate 201 can be arranged at the edge of the opening of the housing 20 or at any appropriate position that can be realized by a person of ordinary skill in the art. The space 202 formed by the housing 20 and the integrated motor base is used to accommodate the voice coil motor assembly described above.

[0118] The liquid lens subassembly 2 may include a liquid lens 21 and a support frame 22 for fixing the liquid lens. The support plate 201 of the housing 20 may be connected to the support frame 22 to support the liquid lens subassembly 2. The voice coil motor 1 may also include a drive circuit part for closed-loop control of the displacement of the movable part. The drive circuit part will be described in detail below and will not be described in detail here.

[0119] The above mainly describes the structure of one sub-motor part. The structures of multiple sub-motor parts can be the same, that is, multiple sub-motor parts all include the parts, components or assemblies described above for one of the sub-motor parts. The structures of multiple sub-motor parts can also be different, but include parts, components or assemblies that can achieve the same functions as the above parts, components or assemblies. Multiple sub-motor parts can be independent structures, or multiple sub-motor parts can share the same component.

[0120] Multiple sub-motor parts can form an integrated voice coil motor, wherein the parts in the multiple sub-motor parts can form an integrated part, for example, the motor base parts of the multiple sub-motor parts can form an integrated motor base, the circuit boards of the multiple sub-motor parts can form an integrated circuit board, the extrusion parts of the multiple sub-motor parts can form an integrated extrusion part, the upper support springs or the lower support springs of the multiple sub-motor parts can form an integrated upper support spring or an integrated lower support spring, etc. Each sub-motor part uses a part of the integrated parts as a part inside each sub-motor part to realize the corresponding function.

[0121] Preferably, the voice coil motor 1 includes a plurality of sub-motor parts distributed around the optical axis on the four sides of the voice coil motor. For example, in the embodiment of the present application, the voice coil motor includes four sub-motor parts, and the four sub-motor parts are distributed on the four sides of the voice coil motor.

[0122] In summary, the voice coil motor of the embodiment of the present application includes a plurality of sub-motor parts, each of which mainly includes a stationary part, a movable part, a connecting spring, a support part and a driving circuit part. The support part is used to support and suspend the movable part, and the driving circuit part is used to drive the movable part to move, and finally change the curvature of the lens, which is equivalent to the translation or rotation of the lens, thereby changing the focus and realizing autofocus and optical image stabilization. The setting of the connecting spring can keep the movable part of the voice coil motor moving in a single direction, ensuring that the distance between the magnet and the coil remains unchanged, thereby making the control of the liquid lens displacement more precise. The specific working process of the voice coil motor will be described later and will not be described in detail here.

[0123] Figure 6The exploded perspective view of the lens assembly of another embodiment of the present application is shown. The lens assembly B comprises a voice coil motor 1 , a liquid lens subassembly 2 and a housing 20 .

[0124] like Figure 6 As shown, the voice coil motor 1 of another embodiment of the present application includes multiple sub-motor parts, and the multiple sub-motor parts can be controlled independently. Each sub-motor part mainly includes a motor base part 11, a circuit board 12, a magnet 13, a coil 14, a U-shaped magnetic isolation sheet 15, a lower supporting spring sheet 16, an upper supporting spring sheet 17, a connecting spring sheet 18, and an extrusion component part 19.

[0125] In the embodiment of the present application, the voice coil motor includes four sub-motor parts, and the four sub-motor parts are respectively located on the four sides of the voice coil motor. It should be understood that in some other embodiments, the voice coil motor may include other numbers of sub-motor parts, such as three, six, eight or more sub-motor parts.

[0126] The voice coil motor 1 is generally in the shape of a cube, and the space formed by the housing 20 and the motor base portion 11 of the plurality of sub-motor portions is used to accommodate other components of the voice coil motor or other components of the lens assembly B. Figure 7 That is, an exploded perspective view of the voice coil motor is shown. Figure 7 Describe the structure of the voice coil motor in detail.

[0127] The motor base portion 11 includes a substrate portion 111a and a fixed base 112'. The motor base portion 11 is located at the rear side of the voice coil motor in the optical axis direction, and can also be considered to be located at the bottom layer of the voice coil motor, and is used to support the corresponding sub-motor part structure. The motor base portion 11 of multiple sub-motor parts is used to support the entire motor and module structure.

[0128] The fixing base 112' is disposed at both ends of the front end surface of the base plate portion 111a, and is used to fix the upper supporting spring sheet 17 and the lower supporting spring sheet 16. The fixing base 112' may be provided with an extending protrusion for mechanically and electrically connecting with the lower supporting spring sheet 16.

[0129] Preferably, the motor base parts 11 of the multiple sub-motor parts can constitute an integrated motor base, that is, the substrate parts 111a of the multiple motor base parts can constitute an integrated substrate, and adjacent sub-motor parts can share a fixed base, etc. In the embodiment of the present application, the voice coil motor using an integrated motor base is used as an example for description, and it should be understood that other structures provided on the integrated motor base can also be applicable to the motor base parts of multiple sub-motors.

[0130] For an integrated motor base, it may include an integrated substrate 111 and a fixed base 112'. Figure 7As shown, the integral substrate 111 is generally square, with a hole formed in the middle. The fixed base 112' is arranged at the four corners of the front end surface of the integral substrate 111. The fixed base 112' is provided with extension protrusions 1125 and 1126 for mechanical connection with the lower support spring sheet 16, and the extension protrusions 1125 and 1126 are embedded with power pins for electrical connection with the lower support spring sheet 16. The top of the fixed base 112', i.e., the front end surface, is used for mechanical connection with the upper support spring sheet 17, and the fixed base 112 is embedded with power pins for electrical connection with the upper support spring sheet 17.

[0131] Of course, in other implementations, the fixed base 112' may also be set at other positions of the integral substrate 111, for example, on the four sides of the integral substrate 111; the number of fixed bases 112' set on the integral substrate 111 is not limited to 4, and other numbers of fixed bases 112' may also be set; the number of extended protrusions on each fixed base 112' is not limited to two, and other numbers of extended protrusions may also be set, for example, 1.

[0132] Optionally, the fixed base 112 ′ may be formed integrally with the integral substrate 111 , or may be connected to the integral substrate 111 by welding or bonding.

[0133] The sub-motor part of the voice coil motor also includes a lower supporting spring sheet 16 and an upper supporting spring sheet 17, which are used to support and suspend the movable part. One end of the lower supporting spring sheet and the upper supporting spring sheet are fixed to the movable part, and the other end is fixed to the fixed part. Figure 7 The voice coil motor shown in is described as an example.

[0134] Each sub-motor part may include two lower support springs 16, such as 16a and 16b shown in the figure. Taking the lower support spring 16b as an example, the lower support spring 16b includes a first lower connection portion 163 and a second lower connection portion 164. The first lower connection portion 163 is connected to the extended protrusion of the fixed base 112', and the second lower connection portion 164 is connected to the rear end of the circuit board 12 through a pin, so that the mechanical and electrical connection between the lower support spring 16b and the motor base part 11 and the circuit board 12 is realized.

[0135] Each sub-motor part may include two upper supporting springs 17, such as 17a and 17b shown in the figure. Taking the upper supporting spring 17b as an example, the upper supporting spring 17b includes a first upper connecting portion 173 and a second upper connecting portion 174. The first upper connecting portion 173 is connected to the front end surface of the fixed base 112', and the second upper connecting portion 174 is connected to the front end of the circuit board 12 through a pin, so that the mechanical and electrical connection between the upper supporting spring 17 and the motor base part 11 and the circuit board 12 is realized.

[0136] In some embodiments, two adjacent sub-motor parts may share an upper supporting spring sheet, and the upper supporting spring sheet may include a first upper connecting portion and two second upper connecting portions.

[0137] In some implementations, the upper supporting spring sheet 17 and the lower supporting spring sheet 16 may be mechanically and electrically connected to the motor base portion 11 and the circuit board 12 in other ways.

[0138] The coil 14 is fixed on the outer surface of the circuit board 12, corresponding to the multiple sub-motor parts. There are four coils 14 in the embodiment of the present application, which are distributed on the four sides of the motor perpendicular to the optical axis.

[0139] The coil 14 can be a ring coil or a coil of other forms, and the embodiment of the present application does not make any specific limitation thereto; the number of coils 14 included in each sub-motor part is not limited to one, and a coil 14 of a suitable shape and a suitable number can be matched according to the setting of the circuit board 12.

[0140] The circuit board 12 is also provided with a drive and Hall integrated IC 142 for closed-loop control, which is used to detect the displacement of the voice coil motor and drive the voice coil motor to move according to the detection result. The drive and Hall integrated IC 142 is located in the middle of the coil 14 and can be fixed to the outer surface of the circuit board 12 by welding.

[0141] In some implementations, the circuit board 12 may be an FPCB or a PCB or other electronic device that can implement coil routing.

[0142] In some implementations, the circuit boards 12 corresponding to all coils 14 of multiple sub-motor parts can be integrated or separated.

[0143] The magnet 13 is arranged on the outside of the coil 14, opposite to the coil 14, and is used to provide a magnetic field. The magnet 13 includes an N pole 131 and an S pole 132 arranged relatively front and back in the direction of the optical axis. A person of ordinary skill in the art will know that the N pole and S pole of the magnet can be arranged according to the required magnetic field direction, and is not limited to the N pole being in front of the S pole in the embodiment of the present application. The magnet 13 is fixed on the inner side 158 of the outer wall of the U-shaped magnetic isolation sheet 15. The coil 14 is in the magnetic field of the magnet 13. When the coil 14 is energized, under the action of the magnetic field, the coil 14 and the magnet 13 will produce relative movement under the action of the Ampere force. In the embodiment of the present application, the magnet is fixed on the U-shaped magnetic isolation sheet 15, and the U-shaped magnetic isolation sheet 15 is fixed on the motor base part 11 or the housing 20, so the magnet is fixed, and under the action of the magnetic field, the coil 14 will move relative to the magnet 13 along the optical axis.

[0144] Each sub-motor part may include a U-shaped magnetic shielding sheet, corresponding to the number of sub-motor parts, and the four U-shaped magnetic shielding sheets 15 of the multiple sub-motor parts are distributed perpendicular to the optical axis on the four sides of the motor. The magnetic shielding space between the inner wall and the outer wall of the U-shaped magnetic shielding sheet 15 sequentially accommodates the circuit board 12, the drive and Hall integrated IC, the coil 14, and the magnet 13 from the inside to the outside. The U-shaped magnetic shielding sheet 15 is used to reduce the leakage magnetic flux generated when the magnet and the coil are energized, thereby increasing the motor thrust. A person of ordinary skill in the art can know that the U-shaped magnetic shielding sheet 15 can be set accordingly according to the setting method of the coil 14, without limiting the method listed in the embodiment of the present application.

[0145] In some implementations, the circuit board 12 may be fixed on a fixing plate (not shown in the figure), and the fixing plate is fixed on the inner wall of the U-shaped magnetic isolation sheet 15 .

[0146] The U-shaped magnetic isolation sheet 15 can be fixed on the motor base portion 11 or the housing 20 .

[0147] In the embodiment of the present application, the magnet 13, the U-shaped magnetic isolation sheet 15, and the motor base portion 11 can be regarded as the fixed parts whose positions remain unchanged relative to the liquid lens assembly 2 during the process of adjusting the liquid lens. Since the coil is subjected to force and moves after being energized, in order to transmit power, a connecting spring 18 is fixed on the inner side of the circuit board 12, that is, the side close to the motor cavity. The connecting spring 18 plays the role of connection, power transmission and buffering. This function is the same as the function of the connecting spring in the previous embodiment, and only differs in structure. In order to facilitate the connection and movement of the connecting spring 18 and the circuit board 12, an opening 156 is opened on the inner side wall of the U-shaped magnetic isolation sheet 15, and an opening 157 can also be opened on the front end face of the U-shaped magnetic isolation sheet.

[0148] In some implementations, the U-shaped magnetic shielding sheet 15 can also open forward or adopt other U-shaped magnetic shielding sheet designs, so that it has no interference with the movement of the coil 14 in the direction of the optical axis. The connecting spring 18 is in the shape of a sheet, one end of which is fixed to the inner side of the circuit board 12, and the other end is connected to the extrusion component part 19. Its second connection part 1812 is connected to the inner side of the circuit board 12, and its first connection part 1811 is connected to the extrusion component part 19. In the embodiment of the present application, each sub-motor part includes a connecting spring, and corresponding to the number of sub-motor parts, the four connecting springs 18 of the multiple sub-motor parts are distributed on the four sides of the voice coil motor, and the connecting springs of the sub-motor parts are correspondingly connected to the circuit board 12. A person of ordinary skill in the art will know that the position and number of the connecting springs 18 can be set accordingly according to the setting of the coil 14 or the magnet 13. The embodiment of the present application is not limited to the number of connecting springs 18 included in the sub-motor part being one, which is equivalent to not limiting the total number of connecting springs 18 of multiple sub-motor parts to 4, nor limiting the specific connection position of the connecting springs.

[0149] In some possible implementations, other shapes of magnetic isolation plates may be used to replace the U-shaped magnetic isolation plate 15 in the voice coil motor to prevent or reduce magnetic leakage between the magnet and the coil.

[0150] In some possible implementations, the voice coil motor may not include the U-shaped magnetic isolation plate 15 , and the magnet 13 may be connected to the motor base portion 11 through other components, or directly connected to the motor base portion 11 .

[0151] The connecting spring 18 can be a leaf spring, which has a larger stiffness coefficient in the direction of the optical axis, that is, the stiffness is larger in the direction of the optical axis, and a smaller stiffness coefficient in the direction perpendicular to the optical axis. When the motor driving force received by the connecting spring is within the preset motor driving force threshold, the connecting spring 18 is only allowed to undergo a slight deformation in the direction perpendicular to the optical axis. Therefore, the connecting spring 18 can be used to transmit the driving force to the extrusion component part 19, drive the extrusion component part 19 to move, and ensure that the voice coil motor moves in a single direction; when the force received by the connecting spring in the direction of the optical axis exceeds the preset motor driving force threshold, the connecting spring can undergo a larger bending deformation in the direction perpendicular to the optical axis. When the force received in the direction of the optical axis disappears or is less than the preset motor driving force threshold, the connecting spring 18 returns to its original state. Therefore, the connecting spring 18 can also play a buffering role when the force received in the direction of the optical axis is large, so as to protect other modules or lens components inside the voice coil motor.

[0152] In the embodiment of the present application, the coil 14 and the circuit board 12 can be regarded as movable parts that can move relative to the liquid lens subassembly 2 during the process of adjusting the liquid lens.

[0153] The upper supporting spring sheet 17 and the lower supporting spring sheet 16 are both supporting members, which are used to support and suspend the movable member of the motor. Of course, the supporting member can adopt any connection method known to those of ordinary skill in the art to realize a parallelogram anti-dumping structure.

[0154] The structures of the housing 20, the pressing component portion 19 and the liquid lens subassembly 2 may be the same as those in the previous embodiment. For detailed description, please refer to the above and will not be repeated here.

[0155] The four metal PINs formed by insert molding on the circuit board 12 are respectively welded to the four pins of the upper supporting spring sheet 17 and the lower supporting spring sheet 16, thereby realizing the connection between the driver IC and the four drivers and Hall integrated ICs of the multiple sub-motor parts.

[0156] The multiple sub-motor parts mentioned above can form an integrated voice coil motor, wherein the parts in the multiple sub-motor parts can form an integrated part, for example, the motor base parts of the multiple sub-motor parts can form an integrated motor base, the circuit boards of the multiple sub-motor parts can form an integrated circuit board, the extrusion parts of the multiple sub-motor parts can form an integrated extrusion part, the upper support springs or the lower support springs of the multiple sub-motor parts can form an integrated upper support spring or an integrated lower support spring, etc. Each sub-motor part uses a part of the integrated parts as a part inside each sub-motor part to realize the corresponding function.

[0157] Preferably, the voice coil motor 1 includes a plurality of sub-motor parts distributed around the optical axis on the four sides of the voice coil motor. For example, in the embodiment of the present application, the voice coil motor includes four sub-motor parts, and the four sub-motor parts are distributed on the four sides of the voice coil motor.

[0158] The voice coil motor in the embodiment of the present application described above may also include a drive circuit part for closed-loop control of the moving distance of the movable part. The drive circuit part may include a drive IC, a drive and Hall integrated IC, and line connections. The description of the drive circuit part will be combined with Fig.10 and Fig.11 The following will be explained and will not be described in detail here.

[0159] In the voice coil motor of the embodiment of the present application, the support is used to support and suspend the movable component, and the driving circuit part is used to drive the movable part to move, and finally change the curvature of the lens, which is equivalent to the translation or rotation of the lens, thereby changing the focus and realizing automatic focus and optical image stabilization. The setting of the connecting spring can keep the movable part of the voice coil motor moving in a single direction, ensuring that the distance between the magnet and the coil remains unchanged, so as to make the control of the displacement of the liquid lens more precise. The specific working process of the voice coil motor will be described later and will not be described in detail here.

[0160] exist Figures 2 to 7 In the voice coil motor shown, multiple sub-motor parts can be independently controlled to squeeze the liquid lens uniformly or unevenly. Since the force squeezing the liquid lens comes from the Ampere force generated by the energized coil in the magnetic field, the four coils 14 included in the multiple sub-motor parts can be independently controlled. When the same driving force is generated on the squeezing component part 19 in the same size and direction, it can be used for automatic focusing of the liquid lens; when different driving forces are generated on the squeezing component part 19 in different sizes and / or directions, it can be used for optical image stabilization and / or automatic focusing. Figure 8 and Fig. 9 The principles and processes of several working states of the voice coil motor are explained in detail.

[0161] However, it should be understood that multiple sub-motor parts can also be controlled synchronously or in groups. Taking the above-mentioned voice coil motor including four sub-motor parts, each sub-motor part including a coil and a magnet as an example, the force for squeezing the liquid lens comes from the Ampere force generated by the energized coil in the magnetic field. The same control instruction can be used to control the movement of the four coils at the same time, or the movement of two of the coils can be controlled by one instruction, and the movement of the other two coils can be controlled by another instruction.

[0162] Figure 8 A diagram showing the working principle of the voice coil motor of an embodiment of the present application when used for autofocus. Figure 8 only Figure 7 In the embodiment shown, the movable part includes a coil and the stationary part includes a magnet. For the embodiment in which the movable part includes a magnet and the stationary part includes a coil, the working principle of the autofocus is the same.

[0163] It should be noted that Figure 8 In the example, for ease of understanding, the extrusion component part used for extruding the liquid lens in the multiple sub-motor parts forms an integral extrusion component 19'. At the same time, the internal structure of the voice coil motor is simplified in the schematic diagram, and components such as the U-shaped magnetic isolation sheet and the circuit board are not shown.

[0164] Figure 8(a) in the figure shows the state of the voice coil motor before autofocusing. The light L reflected by the object passes through the liquid lens 21 and the fixed lens F, and converges to the point Fa on the lower side of the sensor G. The point Fa is the focus of the current state. When the coil 14 is energized, the energized coil 14 is acted upon by the magnetic field force in the magnetic field of the magnet 13. Since the magnet 13 is stationary, the coil 14 is a movable part. Under the action of the magnetic field force, the coil 14 moves along the optical axis relative to the magnet 13. From the figure, the coil 14 moves in the positive direction of Z. One end of the connecting spring 18 is fixedly connected to the U-shaped magnetic isolation sheet to which the coil 14 is fixed, and the other end is connected to the extrusion component 19'. Therefore, the Z-direction movement of the coil 14 will drive the connecting spring 18 and the extrusion component 19' to move in the Z direction, and then the extrusion component 19' will squeeze the liquid lens 21, thereby changing the curvature of the liquid lens 21. During autofocusing, the four coils 14 are independently controlled, and the magnitude and direction of the magnetic field force on each coil 14 are the same. Therefore, the magnetic field force on the four coils 14 and the distance they move along the Z direction are the same. It can be seen that the thrust on the extrusion component 19' and the distance they move along the Z direction are the same, so the refractive surface 211 of the liquid lens 21 is squeezed uniformly. Therefore, the focus moves from the focus Fa in (a) along the Z direction to the focus Fb, and the focus Fb is located on the sensor, and the image is clear at this time. At the same time, the upper supporting spring 17 and the lower supporting spring 16 ensure that the coil 14 does not move perpendicular to the optical axis, and the coil 14 only moves in the direction of the optical axis. The connecting spring piece 18 has great rigidity in the direction of the optical axis. During normal operation, the driving force of the motor is much smaller than the driving force threshold for obvious deformation and bending of the connecting spring piece. The thrust applied by the coil 14 to the connecting spring piece 18 has no force component in the direction perpendicular to the optical axis or the component value is too small to cause the connecting spring piece 18 to deform in the direction perpendicular to the optical axis. This ensures that the thrust of the coil 14 (which can also be considered as the driving force of the motor) is transmitted to the extrusion component 19', thereby achieving autofocus.

[0165] Fig. 9 The working principle diagram of the voice coil motor of the embodiment of the present application when used for optical image stabilization is shown. Figure 8 Only Figure 7 In the embodiment shown, the movable part includes a coil and the stationary part includes a magnet. For the embodiment in which the movable part includes a magnet and the stationary part includes a coil, the working principle of the optical image stabilization is the same.

[0166] It should be noted that Fig. 9 In the example, for ease of understanding, the extrusion component part used for extruding the liquid lens in the multiple sub-motor parts forms an integral extrusion component 19'. At the same time, the internal structure of the voice coil motor is simplified in the schematic diagram, and components such as the U-shaped magnetic isolation sheet and the circuit board are not shown.

[0167] Fig. 9(a) shows the state of the voice coil motor before optical image stabilization. The light L reflected by the object passes through the liquid lens 21 and the fixed lens F and converges at the point Fc on the sensor G. The point Fc is the focus of the current state. When shaking occurs, the voice coil motor needs to perform optical image stabilization.

[0168] Fig. 9 (b) and (c) in the figure show schematic diagrams of voice coil motors used for optical image stabilization.

[0169] If the connecting spring 18 is rigid, the process of using the voice coil motor for optical image stabilization is shown in Figure (b). When the coil 14 is energized, the energized coil 14 moves along the optical axis under the action of the magnetic field force of the magnet 13. As can be seen from the figure, the coil 14 moves in the positive direction of Z, thereby pushing the rigid connecting spring 18 and the extrusion component 19' to move along the Z direction. Since the four coils 14 are independently controlled, when optical image stabilization is performed, the magnetic field force exerted on each coil 14 is different, so the magnetic field force exerted on the four coils 14 and the distance moved along the Z direction are not exactly the same. It can be seen that the driving force exerted on the extrusion component 19' and the distance moved are not exactly the same. Therefore, the extrusion exerted on the refractive surface 211 of the liquid lens 21 is not uniform, so that the focus can be shifted from the focus Fc in (a) to the focus Fd in (b), that is, optical image stabilization. However, during the optical image stabilization process, if the connecting spring pieces 18 are rigid, the moving distances of the four connecting spring pieces 18 are not exactly the same, which causes the extrusion component 19' to rotate. Since the upper and lower ends of the connecting spring pieces 18 are fixedly connected, the rotation of the extrusion component 19' causes the connecting spring pieces 18 to rotate accordingly, which is equivalent to the connecting spring pieces 18 being tilted, thereby driving the coil 14 to tilt. After the coil 14 is tilted, the distance between the coil 14 and the magnet 13 will change, resulting in the current value in the input coil not accurately corresponding to the corresponding displacement, and therefore, the deformation of the liquid lens cannot be accurately controlled.

[0170] The embodiment of the present application adopts a specially designed connecting spring 18, which can realize that the movable part of the voice coil motor maintains a single direction of movement during optical image stabilization. Fig. 9(c) is described. The stiffness of the connecting spring 18 in the direction of the optical axis is much greater than the stiffness in other directions. When the coil 14 is energized, the energized coil 14 moves along the Z direction under the action of the magnetic field force of the magnet 13, thereby pushing the connecting spring 18 and the extrusion component 19' to move along the Z direction. Since the four coils 14 are independently controlled, when optical image stabilization is performed, the magnetic field force exerted on each coil 14 is different, and thus the magnetic field forces exerted on the four coils 14 and the distances moved along the Z direction are not exactly the same. It can be known that the pushing force and moving distance of the squeezing component 19' are not exactly the same. Therefore, the squeezing component 19' connected to the connecting spring 18 rotates. Under the action of the force generated by the rotation of the squeezing component, the connecting spring can bend in the direction perpendicular to the optical axis, converting the tilting movement of the coil 14 to its own bending, thereby isolating the influence of the rotation of the squeezing component 19' on the coil 14. The component value of the force of the connecting spring in the direction perpendicular to the optical axis is very small and insufficient to cause the connecting spring 18 to deform significantly in the direction perpendicular to the optical axis, which can ensure that the thrust of the coil 14 (which can also be considered as the driving force of the motor) is transmitted to the squeezing component 19'. At the same time, the upper supporting spring 17 and the lower supporting spring 16 ensure that the coil 14 does not move in the direction perpendicular to the optical axis, thereby ensuring that the coil 14 only moves in the direction of the optical axis, that is, only in a single direction. The movable part of the voice coil motor keeps moving in a single direction during the optical image stabilization process, ensuring that the distance between the magnet and the coil remains unchanged, so that the current value of the coil and the displacement of the movable part have good correspondence, thereby achieving precise control of the deformation of the liquid lens. At the same time, in the embodiment of the present application, the driving circuit part adopts a driving and Hall integrated IC to perform closed-loop control on the displacement of the movable part. The movement of the movable part in a single direction can also ensure the accuracy of the driving and Hall integrated IC in detecting the displacement of the movable part, thereby realizing precise control of the deformation of the liquid lens in closed-loop control.

[0171] The voice coil motor of the embodiment of the present application can independently realize the automatic focusing of the liquid lens, for example Figure 8 The process shown; optical image stabilization of the liquid lens can be achieved alone, for example Fig. 9 The process shown; due to the movement of the movable part of the voice coil motor in a single direction, the voice coil motor can also simultaneously realize the autofocus and optical image stabilization of the liquid lens.

[0172] When the voice coil motor performs autofocus and optical image stabilization at the same time, since the four coils can be controlled independently, the distance required to move for autofocus and the distance required to move for optical shake can be superimposed and combined for calculation, so that the movable part of the voice coil motor moves a certain distance in the direction of the optical axis, which can cause the imaging focus of the subject to shift while moving along the optical axis, thereby achieving autofocus and optical image stabilization at the same time.

[0173] Therefore, the voice coil motor in the embodiment of the present application can ensure that the distance between the magnet and the coil remains unchanged through the design of connecting the spring pieces, so that the current in the input coil can accurately correspond to the displacement of the movable part, which is beneficial to the precise control of the deformation and displacement of the liquid lens, and can simultaneously achieve autofocus and optical image stabilization by moving only in the direction of the optical axis.

[0174] In some cases, when the force in the optical axis direction applied to the connecting spring piece is greater than the designed driving force value, there is a large component of force in the direction perpendicular to the optical axis on the connecting spring piece, which causes the connecting spring piece to be significantly deformed and cannot play a role in transmitting force. For example, when the lens module falls, a large force will be generated on the connecting spring piece. The obvious deformation of the connecting spring piece makes it impossible for all the force to be transmitted to the liquid lens, thereby playing a buffering role and protecting the components inside the lens module.

[0175] Specific non-limiting examples of connecting springs according to embodiments of the present application are described in more detail below. Fig.10 A schematic structural diagram of the connecting spring sheet of an embodiment of the present application is shown.

[0176] The connecting spring in the embodiment of the present application is a leaf spring, and its stiffness coefficient can also be called stubbornness coefficient or stiffness coefficient or elastic coefficient, which is used to describe the magnitude of the elastic force generated per unit deformation, usually represented by k. A large k value indicates that a large force is required for deformation per unit length, or the spring is "tough". The stiffness coefficient is numerically equal to the elastic force when the spring is stretched (or shortened) per unit length. Its value is related to the material of the spring, the thickness of the spring and the temperature. When other conditions are constant, the lower the temperature, the larger k is.

[0177] The stiffness coefficient of the connecting spring in the embodiment of the present application is relatively large in the direction of the optical axis, and relatively small in the direction perpendicular to the optical axis. Therefore, the stiffness of the connecting spring in the direction of the optical axis is much greater than the stiffness in other directions, so that the connecting spring is not easy to stretch and bend in the direction of the optical axis, but is easy to bend in the plane of minimum stiffness, that is, in the direction perpendicular to the optical axis. When the force in the direction of the optical axis applied to the connecting spring is less than the designed motor driving force, the component value of the force applied to the connecting spring in the direction perpendicular to the optical axis is very small, so that only a slight deformation of the connecting spring is allowed. When the force in the direction of the optical axis applied to the connecting spring is greater than the designed motor driving force, the component value of the force applied to the connecting spring in the direction perpendicular to the optical axis is large, which can cause a large bending deformation of the connecting spring in the direction perpendicular to the optical axis.

[0178] When determining the above-mentioned designed motor driving force, the embodiment of the present application ignores the influence of other factors and can only consider the ideal state of the connecting spring plate under stress. Through simulation or theoretical calculation, the maximum force applied to the connecting spring plate that causes the connecting spring plate to deform in the direction of the optical axis is obtained, that is, the supporting force of the connecting spring plate in the direction of the optical axis to resist its deformation in the direction of the optical axis. The designed motor driving force is less than the force that causes the connecting spring plate to deform in the direction of the optical axis, which is equivalent to the maximum driving force generated by the magnet and the coil during the operation of the motor, that is, the designed motor driving force, which is less than the force that causes the connecting spring plate to deform in the optical axis. The actual situation is more complicated than the ideal state, and those skilled in the art can adjust the designed motor driving force according to the actual situation or taking into account other factors.

[0179] Fig.10 Some specific non-limiting examples of connecting springs are shown. Fig.10 As shown in (a), the connecting spring 18 is in the shape of a sheet, and is exemplified as a serpentine leaf spring in the figure. The connecting spring 18 has a first connecting portion 1811 and a second connecting portion 1812, and may further include an intermediate portion 1813 between the first connecting portion 1811 and the second connecting portion 1812.

[0180] The first connection part 1811 is connected to the extrusion component 19'. Specifically, the first connection part 1811 includes two claws 1801 and 1802. The claws 1801 and 1802 are connected at one end close to the middle part 1813 and are separated by a distance at the other end. Taking the claw 1801 as an example, the claw 1801 is provided with an inclined portion 1801a. Due to the existence of the bevel, the inclined portion 1801a of the claw 1801 and the inclined portion 1802a of the claw 1802 can be inserted into the ear of the extrusion component 19' whose inner diameter is smaller than the width of the connecting spring sheet. During the insertion process, the inclined portions 1801a and 1802a are subjected to the force applied by the ear. Since the claw 1801 and the claw 1802 are not connected at this end, under the action of the force, the claw 1801 and the claw 1802 will move closer to each other and thus be inserted into the ear. An opening 1801b is provided on the claw 1801 near the inclined portion 1801a, and the width of the opening 1801b is slightly larger than the height of the ear. When the ear slides to the openings 1801b and 1802b, the inclined portions 1801a and 1802a are subjected to reduced or no longer stressed forces. Under the elastic deformation of the claw, the claw 1801 and the claw 1802 move away from each other, so that the openings 1801b and 1802b are stuck on the ear, thereby achieving the purpose of connecting the first connecting portion 1811 of the connecting spring 18 with the extrusion component.

[0181] The second connection portion 1812 of the connecting spring 18 is connected to the movable part of the sub-motor part, which can be directly connected, such as welding, bonding, etc., or indirectly connected, such as connecting the second connection portion 1812 to the movable part through other parts.

[0182] The shape of the middle portion 1813 of the connecting spring piece 18 can be curved, straight, or a combination of curved and linear. The first connecting portion 1811, the middle portion 1813, and the second connecting portion 1812 of the connecting spring piece 18 can be in the same plane or in different planes. If the first connecting portion 1811, the middle portion 1813, and the second connecting portion 1812 are in different planes, the connecting spring piece 18 can also be provided with a portion for connecting the first connecting portion 1811 and the middle portion 1813 on different planes, and a portion for connecting the middle portion 1813 and the second connecting portion 1812.

[0183] The connecting springs in the embodiment of the present application can have various deformation forms. Fig.10 (b) is another non-limiting example of the connecting spring in the embodiment of the present application. The specific connection method can be determined according to the structure of the extrusion component and the movable part. It is only used as an example here and its specific structure will not be described in detail.

[0184] The connecting spring piece of the embodiment of the present application can be made of materials such as copper alloy, tin bronze, zinc white copper, beryllium bronze, silicon manganese steel, etc.

[0185] It should be understood that the connecting springs of the embodiment of the present application can adopt any design form known in the art, such as Figure 5 The serpentine leaf spring shown, Figure 7 The rectangular straight leaf spring shown can also be a trapezoidal, triangular or step-shaped leaf spring, etc., as long as the stiffness of the connecting spring in the direction of the optical axis is much greater than the stiffness in the direction perpendicular to the optical axis. A person skilled in the art can know that based on the inspiration of the connecting spring structure shown in the embodiment of the present application, those skilled in the art can obtain many connecting springs with other deformed structures that can realize the functions of the connecting spring in the embodiment of the present application, and it should be understood that the connecting springs with these deformed structures are all within the protection scope of the present application.

[0186] The movement of the sub-motor part of the voice coil motor is driven by the driving circuit. For example, the movable part of the voice coil motor is usually driven by the driving circuit part. Fig.11 It is a circuit connection diagram of an embodiment of the present application.

[0187] The multiple sub-motor parts in the voice coil motor can each use a separate set of driving circuits and driving devices, or share a set of driving circuits and a set of driving devices, and of course, can share part of the driving circuits and part of the driving devices. In the embodiment of the present application, the multiple sub-motor parts of the voice coil motor have driving and Hall integrated ICs respectively, but can share a microcontroller unit. The following is an overall description of the driving circuit part of the four sub-motor parts exemplified in the embodiment of the present application.

[0188] According to the structure of the voice coil motor in the above embodiment, the driving circuit part of the voice coil motor in the embodiment of the present application includes 4 driving and Hall integrated ICs 142 and a microcontroller unit (MCU), the 4 driving and Hall integrated ICs 142 are located in the middle of the 4 coils 14 of the voice coil motor, and the MCU is located on the module substrate or other substrate outside the voice coil motor. The voice coil motor includes four sub-motor parts, each sub-motor part includes a coil, so the voice coil motor includes 4 coils 142, each coil leads 2 leads to the corresponding driving and Hall integrated ICs 142, the MCU and the 4 driving and Hall integrated ICs 142 are connected in parallel through 2 I2C communication lines, that is, a total of 4 lines can be led out from the voice coil motor, including 2 communication lines, 1 power line and 1 ground line. The MCU is connected to the system on chip (SOC) through the I2C communication line, and the MCU is connected to the gyro through the serial peripheral interface (SPI), and the SOC is connected to the gyro through the SPI. In the embodiment of the present application, since the drive and Hall integrated IC is arranged inside the voice coil motor, the number of motor leads is greatly reduced.

[0189] In some implementations, an OIS driver IC or other logic devices may be used to replace the microcontroller unit MCU to implement the functions of the MCU in the application embodiments.

[0190] In some implementations, the coil, drive, and Hall integrated IC can be routed on the circuit board 12, and the internal and external circuit connections of the voice coil motor can be achieved by embedding power pins in the motor base 11.

[0191] It should be understood that in the circuit connection of the embodiment of the present application, the number of driver and Hall integrated ICs is determined according to the design of the voice coil motor.

[0192] Fig.12 It is a control flow chart of voice coil motor autofocus and optical image stabilization according to an embodiment of the present application.

[0193] like Fig.11As shown, after the image sensor G detects the image-related information, it inputs the focus information such as image clarity as input information into the SOC; the SOC stores an image processing algorithm, and the SOC can calculate the AF instruction based on the read image data. The AF instruction can be the distance that the voice coil motor 1 needs to move for autofocus. The gyroscope Gyro can detect jitter information such as angular velocity, angular acceleration, etc.; the AF instruction and jitter information are input into the MCU as input information. The MCU has a calculation function. The MCU can calculate a motor displacement instruction based on the jitter information and the AF instruction through superposition and fusion algorithms, and input it to the drive and Hall integrated IC142. The motor displacement instruction indicates the final distance that the voice coil motor 1 needs to move, which can simultaneously achieve autofocus and optical image stabilization. After the drive and Hall integrated IC142 drives the motor movable component to move, the Hall sensor will detect the displacement of the motor movable component and form a closed-loop control of the motor in the drive and Hall integrated IC142. The movement of the motor movable part can change the curvature of the liquid lens 21, thereby achieving autofocus and optical image stabilization.

[0194] Optionally, when the MCU calculates the motor displacement instruction, the MCU can calculate the OIS instruction based on the jitter information. The OIS instruction can indicate the distance the voice coil motor 1 needs to move for optical jitter. The MCU then superimposes the distance the voice coil motor 1 is instructed to move by the AF instruction and the distance the voice coil motor 1 is instructed to shift by the OIS instruction to obtain the final distance the voice coil motor 1 moves.

[0195] Optionally, the voice coil motor displacement instructions input by the MCU to the four driver and Hall integrated ICs 142 can be different, that is, each driver and Hall integrated IC 142 can drive the corresponding motor movable component to move a different distance to achieve independent control of the four driver and Hall integrated ICs 142. In some other embodiments, the AF instruction and the OIS instruction may not be superimposed and merged by the MCU, but the two instructions may be input into the driver and Hall integrated IC respectively; or the SOC may process the focus information and the jitter information to obtain the motor displacement instruction.

[0196] Those skilled in the art will appreciate that the connections described herein include direct connections and indirect connections via intermediate elements.

[0197] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A voice coil motor for driving a liquid lens, characterized in that: The voice coil motor includes a plurality of sub-motor parts, and the plurality of sub-motor parts can be controlled independently, and the sub-motor parts include: The stationary part; A movable member portion movable relative to the fixed member portion along the optical axis direction; A connecting spring, respectively connecting the liquid lens and the movable part, wherein when the movable part is subjected to a force in the direction of the optical axis, the connecting spring drives the connecting spring to squeeze the liquid lens, so that the focus of the liquid lens moves along the direction of the optical axis and / or is offset relative to the optical axis. The connecting spring is a leaf spring, and the stiffness coefficient of the connecting spring in the direction of the optical axis is greater than the stiffness coefficient of the connecting spring in the direction perpendicular to the optical axis. A driving circuit part controls the moving distance of the movable part; Wherein, the sub-motor part also includes an extrusion component part, the connecting spring includes a first connecting part and a second connecting part, the first connecting part is connected to the liquid lens through the extrusion component part, and the second connecting part is connected to the movable part.

2. The voice coil motor according to claim 1, characterized in that: The stationary part includes a motor base part, a coil fixed on the motor base part, and a circuit board, wherein the coil is fixed on the circuit board and electrically connected to the circuit board; The movable part includes a magnet arranged opposite to the coil.

3. The voice coil motor according to claim 2, characterized in that: The movable part also includes a U-shaped magnetic isolation sheet. The magnet is fixed on the inner side wall of the U-shaped magnetic isolation sheet, and the magnetic isolation space formed by the U-shaped magnetic isolation sheet also accommodates the coil and the circuit board; The second connection portion of the connection spring is fixedly connected to the outer side surface of the inner side wall of the U-shaped magnetic isolation plate.

4. The voice coil motor according to claim 1, characterized in that: The stationary part includes a motor base part and a magnet fixed relative to the motor base part; The movable part includes a circuit board and a coil fixed on the circuit board, and the coil is arranged opposite to the magnet.

5. The voice coil motor according to claim 4, characterized in that: The fixed part also includes a U-shaped magnetic isolation sheet. The magnet is fixed on the inner side wall of the U-shaped magnetic isolation sheet, and the magnetic isolation space formed by the U-shaped magnetic isolation sheet also accommodates the coil and the circuit board; The second connection portion of the connecting spring is fixedly connected to the circuit board, the side wall of the U-shaped magnetic isolation sheet has an opening along the optical axis direction, and the connecting spring drives the circuit board to move through the opening.

6. The voice coil motor according to any one of claims 2 to 5, characterized in that: The motor base portions of the plurality of sub-motor portions form an integral motor base.

7. The voice coil motor according to any one of claims 2 to 5, characterized in that: The driving circuit part includes a driving and Hall integrated chip, which is located at the center of the coil and fixed on the circuit board to achieve closed-loop control of the moving distance of the movable part.

8. The voice coil motor according to claim 7, characterized in that: The driving circuit part also includes a microcontroller unit MCU, which obtains autofocus instructions and / or optical image stabilization instructions, and outputs motor displacement instructions to the driving and Hall integrated chip after calculation through superposition and fusion algorithms, so as to perform closed-loop control on the sub-motor part.

9. The voice coil motor according to any one of claims 1 to 5, characterized in that: The extrusion component part includes an arc-shaped extrusion portion and an ear portion arranged on the circumference of the arc-shaped extrusion portion, and the first connection portion of the connecting elastic sheet is connected to the ear portion of the extrusion component part.

10. The voice coil motor according to claim 9, characterized in that: The first connection part is provided with a claw, the ear part is provided with a hole, and the claw is inserted into the corresponding hole, so that the first connection part is partially connected with the extrusion component.

11. The voice coil motor according to claim 9, characterized in that: The arc-shaped extrusion portions of the plurality of sub-motor parts form an integral annular extrusion portion.

12. The voice coil motor according to any one of claims 1 to 5, characterized in that: The sub-motor part also includes an upper supporting spring sheet and a lower supporting spring sheet for supporting and suspending the movable part, wherein: One end of the upper supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part; One end of the lower supporting spring sheet close to the motor cavity is fixed on the movable part, and the other end is fixed on the stationary part.

13. The voice coil motor according to claim 11, characterized in that: The upper supporting springs of the plurality of sub-motor parts form an integrated upper supporting spring; and / or the lower supporting springs of the plurality of sub-motor parts form an integrated lower supporting spring.

14. The voice coil motor according to any one of claims 1 to 5, characterized in that: The plurality of sub-motor parts are distributed on four sides of the voice coil motor around the optical axis.

15. The voice coil motor according to any one of claims 2 to 5, characterized in that: The maximum driving force generated by the interaction of the coil and the magnet is smaller than the force causing the connecting spring to deform in the direction of the optical axis.

16. A lens assembly, characterized in that: The invention comprises a liquid lens and a voice coil motor for driving the liquid lens, wherein the voice coil motor comprises a plurality of sub-motor parts, the plurality of sub-motor parts can be controlled independently, and the sub-motor parts comprise: The stationary part; A movable member portion movable relative to the fixed member portion along the optical axis direction; A connecting spring, respectively connecting the liquid lens and the movable part, wherein when the movable part is subjected to a force in the direction of the optical axis, the connecting spring drives the connecting spring to squeeze the liquid lens, so that the focus of the liquid lens moves along the direction of the optical axis and / or is offset relative to the optical axis. The connecting spring is a leaf spring, and the stiffness coefficient of the connecting spring in the direction of the optical axis is greater than the stiffness coefficient of the connecting spring in the direction perpendicular to the optical axis. A driving circuit part controls the moving distance of the movable part; Wherein, the sub-motor part also includes an extrusion component part, the connecting spring includes a first connecting part and a second connecting part, the first connecting part is connected to the liquid lens through the extrusion component part, and the second connecting part is connected to the movable part.

17. The lens assembly according to claim 16, wherein: The stationary part includes a motor base part, a coil fixed on the motor base part, and a circuit board, wherein the coil is fixed on the circuit board and electrically connected to the circuit board; The movable part includes a magnet arranged opposite to the coil.

18. The lens assembly according to claim 17, wherein: The movable part also includes a U-shaped magnetic isolation sheet. The magnet is fixed on the inner side wall of the U-shaped magnetic isolation sheet, and the magnetic isolation space formed by the U-shaped magnetic isolation sheet also accommodates the coil and the circuit board; The lower part of the connecting spring piece is fixedly connected to the outer side wall of the U-shaped magnetic isolation sheet.

19. The lens assembly according to claim 16, wherein: The stationary part includes a motor base part and a magnet fixed relative to the motor base part; The movable part includes a circuit board and a coil fixed on the circuit board, and the coil is arranged opposite to the magnet.

20. The lens assembly according to claim 19, wherein: The fixed part also includes a U-shaped magnetic isolation sheet. The magnet is fixed on the inner side wall of the U-shaped magnetic isolation sheet, and the magnetic isolation space formed by the U-shaped magnetic isolation sheet also accommodates the coil and the circuit board; The lower part of the connecting spring sheet is fixedly connected to the circuit board, the side wall of the U-shaped magnetic isolation sheet has an opening along the optical axis direction, and the connecting spring sheet drives the circuit board to move through the opening.

21. The lens assembly according to any one of claims 17 to 20, characterized in that: The motor base portions of the plurality of sub-motor portions form an integral motor base.

22. The lens assembly according to any one of claims 17 to 20, characterized in that: The driving circuit part includes a driving and Hall integrated chip, which is located at the center of the coil and fixed on the circuit board to achieve closed-loop control of the moving distance of the movable part.

23. The lens assembly according to claim 22, characterized in that: The driving circuit part also includes a microcontroller unit MCU, which obtains autofocus instructions and / or optical image stabilization instructions, and outputs motor displacement instructions to the driving and Hall integrated chip after calculation through superposition and fusion algorithms, so as to perform closed-loop control on the sub-motor part.

24. The lens assembly according to any one of claims 16 to 20, characterized in that: The extrusion component part includes an arc-shaped extrusion portion and an ear portion arranged on the circumference of the arc-shaped extrusion portion, and the first connection portion of the connecting elastic sheet is connected to the ear portion of the extrusion component part.

25. The lens assembly according to claim 24, characterized in that: The first connection part is provided with a claw, the ear part is provided with a hole, and the claw is inserted into the corresponding hole, so that the first connection part is partially connected with the extrusion component.

26. The lens assembly according to claim 24, characterized in that: The arc-shaped extrusion portions of the plurality of sub-motor parts form an integral annular extrusion portion.

27. The lens assembly according to any one of claims 16 to 20, characterized in that: The sub-motor part also includes an upper supporting spring sheet and a lower supporting spring sheet for supporting and suspending the movable part, wherein: One end of the upper supporting spring sheet close to the motor cavity is fixed to the movable part, and the other end is fixed to the stationary part; One end of the lower supporting spring sheet close to the motor cavity is fixed on the movable part, and the other end is fixed on the stationary part.

28. The lens assembly according to claim 27, characterized in that: The upper supporting springs of the plurality of sub-motor parts form an integrated upper supporting spring; and / or the lower supporting springs of the plurality of sub-motor parts form an integrated lower supporting spring.

29. The lens assembly according to any one of claims 16 to 20, characterized in that: The plurality of sub-motor parts are distributed on four sides of the voice coil motor around the optical axis.

30. The lens assembly according to any one of claims 17 to 20, characterized in that: The maximum driving force generated by the interaction of the coil and the magnet is smaller than the force causing the connecting spring to deform in the direction of the optical axis.

31. The lens assembly according to any one of claims 17 to 20, characterized in that: The lens assembly also includes a housing, which cooperates with the motor base part of the multiple sub-motor parts and has an opening. The space formed by the housing and the motor base part of the multiple sub-motor parts is used to accommodate the voice coil motor and the liquid lens.

32. The lens assembly according to claim 31, characterized in that: The lens assembly also includes a liquid lens support frame, the housing is provided with a support plate, and the support plate is connected to the support frame.

Images