Lens driving device and camera module

Abstract

The present invention discloses a lens driving device and a camera module, wherein the lens driving device comprises a supporting structure, a plurality of electrodes, a lens holder and a plurality of driving wires, wherein the plurality of electrodes are connected to the supporting structure, and the plurality of driving wires are connected to the corresponding electrodes, and the driving wires are configured to drive the lens holder to move relative to the supporting structure on a plane perpendicular to the optical axis when the driving wires are controlled to expand and contract, and the electrodes are pulled to undergo elastic deformation when the expansion and contraction of the driving wires reaches a predetermined threshold. Thus, while achieving optical image stabilization, the driving wires can be well buffered when they are controlled to expand and contract, reducing the possibility of the driving wires falling off from the supporting structure or breaking themselves, thereby improving the stability and yield of the product.

Description

Technical Field

[0001] The present invention relates to the field of camera applications, and in particular to a lens driving device and a camera module. Background Art

[0002] Mobile devices usually have camera modules for taking photos or recording videos. In addition to the light-sensing element (such as an image sensor) used for sensing light, the camera module also contains an optical lens group. In some high-end camera modules, the optical lens group can move parallel or perpendicular to the light-receiving surface of the light-sensing element to offset image shaking caused by device shaking or to perform autofocus.

[0003] Existing optical image stabilization systems can use voice coil motors or shape memory alloy wires to drive the lens holder. However, the voice coil motor has a complex structure and is difficult to achieve thinness; at the same time, there are a large number of magnets in the voice coil motor, which are prone to mutual interference when multiple modules are used in parallel and close together. The electrodes connected to the drive wires made of shape memory alloys (Shape Memory Alloys, SMA) in the current optical image stabilization system are fixedly connected to the support structure by riveting, bonding, welding, etc. When the drive wire is controlled to expand and contract, the tension of the drive wire cannot be well buffered, and it is easy to loosen from the support structure or break itself, resulting in poor stability and low yield of the actual production products. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a lens driving device and a camera module, which can provide good buffering when the driving line is controlled to extend and retract, reduce the driving line from falling off the supporting structure or breaking itself, and improve the stability and yield of the product.

[0005] According to a first aspect of an embodiment of the present invention, there is provided a lens driving device, comprising:

[0006] Support structure;

[0007] A plurality of electrodes connected to the support structure and configured to undergo elastic deformation when a tensile force is greater than a predetermined threshold;

[0008] A lens bracket, used for fixing the optical lens group;

[0009] A plurality of driving wires are connected to the corresponding electrodes, and the driving wires are configured to drive the lens holder to move relative to the supporting structure on a plane perpendicular to the optical axis when the driving wires are controlled to be extended or retracted.

[0010] Preferably, the plurality of electrodes include a first electrode, a second electrode, a third electrode and a fourth electrode, the first electrode and the second electrode are arranged on a first side of the support structure, and the third electrode and the fourth electrode are arranged on a second side opposite to the first side;

[0011] The multiple driving lines include a first driving line and a second driving line, wherein two ends of the first driving line are electrically connected to the first electrode and the third electrode respectively, and a middle portion is connected to the lens holder, and two ends of the second driving line are electrically connected to the second electrode and the fourth electrode respectively, and a middle portion is connected to the lens holder, and the first driving line and the second driving line are configured to drive the lens holder to move along a first direction relative to the supporting structure when being controlled to retract or contract.

[0012] Preferably, the plurality of electrodes further include a fifth electrode, a sixth electrode, a seventh electrode and an eighth electrode, the fifth electrode and the sixth electrode are arranged on a third side of the support structure, and the seventh electrode and the eighth electrode are arranged on a fourth side opposite to the third side;

[0013] The multiple driving lines also include a third driving line and a fourth driving line, wherein two ends of the third driving line are electrically connected to the fifth electrode and the seventh electrode respectively, and a middle portion is connected to the lens holder, and two ends of the fourth driving line are electrically connected to the sixth electrode and the eighth electrode respectively, and a middle portion is connected to the lens holder, and the third driving line and the fourth driving line are configured to drive the lens holder to move relative to the support structure along a second direction perpendicular to the first direction when they are controlled to be extended and retracted.

[0014] Preferably, the first driving line and the second driving line are arranged on the top of the supporting structure and the lens holder, and the third driving line and the fourth driving line are arranged on the bottom of the supporting structure and the lens holder.

[0015] Preferably, the electrode comprises:

[0016] A fixing portion, fixedly connected to the supporting structure;

[0017] an elastic portion extending along the fixing portion and forming a gap with the supporting structure;

[0018] Wherein, both ends of the driving wire are connected to the corresponding elastic parts of the electrode, and when the driving wire is controlled to expand and contract beyond a expansion and contraction threshold, the corresponding elastic part is pulled to undergo elastic deformation.

[0019] Preferably, one side of the elastic portion has a U-shaped groove, both ends of the driving wire have protrusions, and the driving wire is fixed relative to the U-shaped groove through the protrusions.

[0020] Preferably, the lens driving device further comprises:

[0021] A prestressed adjustment screw is detachably connected to the lens bracket, and a middle portion of the driving line bypasses the prestressed adjustment screw and is connected to the lens bracket.

[0022] Preferably, the prestressed adjustment screw is a circular variable cross-section structure.

[0023] Preferably, the lens holder is provided with a plurality of guide grooves, each for guiding the direction of the driving wire.

[0024] Preferably, the driving wire is a shape memory alloy wire.

[0025] Preferably, a plurality of limiting grooves are provided on the side of the supporting structure for limiting the distance between the elastic part and the supporting structure.

[0026] According to a second aspect of an embodiment of the present invention, there is provided a camera module, including:

[0027] Lens housing;

[0028] The lens driving device as described in the first aspect is arranged in the lens housing;

[0029] An optical lens group, arranged in the lens driving device;

[0030] A photosensitive element, arranged opposite to the optical lens group;

[0031] The vibration sensor is arranged in the lens housing and is used to detect and obtain the vibration signal of the lens driving device.

[0032] The embodiment of the present invention discloses a lens driving device and a camera module, wherein the lens driving device includes a support structure, a plurality of electrodes, a lens holder and a plurality of driving wires, wherein the plurality of electrodes are connected to the support structure, and the plurality of driving wires are connected to the corresponding electrodes, and the driving wires are configured to drive the lens holder to move relative to the support structure on a plane perpendicular to the optical axis when the driving wires are controlled to expand and contract, and the electrodes are pulled to undergo elastic deformation when the expansion and contraction of the driving wires reaches a predetermined threshold. Thus, while achieving optical image stabilization, the driving wires can be well buffered when they are controlled to expand and contract, reducing the possibility of the driving wires falling off the support structure or breaking themselves, thereby improving the stability and yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0034] Figure 1 is a structural schematic diagram of a lens driving device according to a first embodiment of the present invention;

[0035] Figure 2 is another structural schematic diagram of the lens driving device according to the first embodiment of the present invention;

[0036] Figure 3is a three-dimensional schematic diagram of the connection between the driving wire and the electrode of the first embodiment of the present invention;

[0037] Figure 4 is a top view of the connection between the driving wire and the electrode of the first embodiment of the present invention;

[0038] Figure 5 is a bottom view of the connection between the driving wire and the electrode of the first embodiment of the present invention;

[0039] Figure 6 is a front view of the connection between the prestressed adjustment screw and the driving wire of the first embodiment of the present invention;

[0040] Figure 7 is a top view of the connection between the prestressed adjustment screw and the driving wire of the first embodiment of the present invention;

[0041] Figure 8 is a structural schematic diagram of a lens driving device according to a second embodiment of the present invention;

[0042] Fig. 9 is another structural schematic diagram of the lens driving device according to the second embodiment of the present invention;

[0043] Fig.10 is another structural schematic diagram of the lens driving device according to the second embodiment of the present invention;

[0044] Fig.11 It is a structural schematic diagram of a camera module according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0046] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0047] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0048] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Embodiment 1:

[0051] Figure 1 FIG. 1 is a schematic diagram of the structure of a lens driving device according to an embodiment of the present invention. Figure 1 As shown, the lens driving device A includes a supporting structure 1, a lens holder 2, a first electrode 3, a second electrode 4, a third electrode 5, a fourth electrode 6, a first driving wire 7 and a second driving wire 8. The lens holder 2 is relatively fixedly connected to the supporting structure 1 through the driving wire, and the lens holder 2 is used to fix the optical lens group B. When the driving wire is controlled to extend and retract, the driving wire can drive the lens holder 2 to move relative to the supporting structure 1 in any direction in a plane perpendicular to the optical axis, thereby offsetting the jitter caused by the user's movement when capturing an image.

[0052] The first electrode 3 and the second electrode 4 are arranged on the first side 11 of the support structure 1, and the third electrode 5 and the fourth electrode 6 are arranged on the second side 12 of the support structure 1. The first side 11 is opposite to the second side 12. The two ends of the first driving line 7 are respectively physically and electrically connected to the first electrode 3 and the third electrode 5 in a relatively fixed manner, and the middle part is connected to the lens driving device 2 to form a V shape. The two ends of the second driving line 8 are respectively physically and electrically connected to the second electrode 4 and the fourth electrode 6 in a relatively fixed manner, and the middle part is connected to the lens holder 2 to form a V shape in the opposite direction to the first driving line 7. Thus, the lens holder 2 is relatively fixedly connected to the support structure 1 through the first driving line 7 and the second driving line 8. The first driving line 7 and the second driving line 8 are set as a V-shaped structure, which can enable the first driving line 7 or the second driving line 8 to drive the lens holder 2 relative to the support structure 1 along the first direction (such as Figure 1 The X-axis is shown in the figure.

[0053] In another optional implementation, the first electrode 3 and the second electrode 4 are arranged on the third side 13 of the support structure 1, and the third electrode 5 and the fourth electrode 6 are arranged on the fourth side 14 of the support structure 1, and the third side 13 is opposite to the fourth side 14. Figure 2 As shown. The two ends of the first driving line 7 are respectively physically and electrically connected to the first electrode 3 and the second electrode 4 in a relatively fixed manner, and the middle part is connected to the lens driving device 2 to form a V-shape. The two ends of the second driving line 8 are respectively physically and electrically connected to the third electrode 5 and the fourth electrode 6 in a relatively fixed manner, and the middle part is connected to the lens holder 2 to form a V-shape in the opposite direction to the first driving line 7. Thus, the lens holder 2 is relatively fixedly connected to the support structure 1 through the first driving line 7 and the second driving line 8. The first driving line 7 and the second driving line 8 are set to a V-shaped structure, which can enable the first driving line 7 or the second driving line 8 to drive the lens holder 2 to move relative to the support structure 1 along a first direction (such as Figure 2 The X-axis is shown in the figure.

[0054] In this embodiment, the first electrode 3, the second electrode 4, the third electrode 5 and the fourth electrode 6 can be made of an elastic conductive metal sheet. When the first drive line 7 or the second drive line 8 is controlled to extend and contract beyond the extension threshold, the corresponding electrode is pulled to undergo elastic deformation, providing a structural buffer for the first drive line 7 or the second drive line 8 to prevent the first drive line 7 or the second drive line 8 from falling off or breaking from the lens holder 2 or the support structure 1 when the first drive line 7 or the second drive line 8 is controlled to exceed the extension threshold. For example, when the assembly is completed, the tension on the drive line is within the range of 0-0.3N (adjustable), and the relative displacement of the electrode relative to the support structure 1 is always maintained at 0.6mm. When the temperature of the external environment rises, or the temperature of the drive line rises after power is turned on, a structural phase change occurs, and the stress in the drive line increases, causing extension and contraction. When the strength of this pulling force is within the range of 0.3N, the shape and position of the electrode remain unchanged, so that the lens holder 2 can move stably. When the temperature of the driving wire further increases, causing the driving wire stress to continue to increase beyond the predetermined working stress range (i.e., the stress is greater than 0.3N), the electrode begins to elastically deform, and the "relative displacement" of the electrode relative to the support structure 1 decreases until it contacts the support structure 1. Due to the elastic deformation of the electrode, an additional structural buffer is provided for the driving wire, so that the stress of the driving wire does not exceed the safe working limit.

[0055] The electrode can be made of materials such as stainless steel or copper alloy. The elastic force of the electrode can be adjusted by changing the material or shape of the electrode. Preferably, the thickness of the electrode is 0.05mm-0.3mm. In order to ensure the reliability of the electrical contact between the electrode and the external drive circuit, a layer of silver plating or gold plating can be provided on the surface of the electrode.

[0056] In this embodiment, the electrode includes an integrally formed fixing portion a and an elastic portion b. Figure 3-5 As shown. The fixed part a can be fixedly connected to the support structure 1 by means of bolts, welding, etc. The elastic part b extends along the fixed part a, and a gap is formed between the elastic part b and the support structure 1, so as to provide a movable space for the elastic deformation of the elastic part b. The two ends of the driving line are fixedly connected to the elastic part b of the corresponding electrode. When the driving line is controlled to extend and retract beyond the extension threshold, the corresponding elastic part b is pulled to undergo elastic deformation, that is, when the tension on the elastic part b is greater than the predetermined threshold, the elastic part b undergoes elastic deformation, and the distance between the two is reduced.

[0057] In an optional implementation, one side of the elastic portion b has a U-shaped groove c, and both ends of the first driving line 7 and the second driving line 8 have protrusions d, such as Figure 3-Figure 5 As shown. The width of the U-shaped groove c is larger than the diameter of the driving wires 7 and 8 and smaller than the width of the protrusion d. After the driving wires 7 and 8 are inserted into the U-shaped groove, they are relatively fixed to the elastic part b through the protrusion d. The protrusions d formed at both ends of the driving wires 7 and 8 can be formed at both ends of the driving wires 7 and 8 by riveting, pressure welding or melting ball technology. For example, the electrode can be made of 0.15mm thick SUS301-H stainless steel, and the surface is electroplated with 0.2um. The diameter of the driving wire is 25um, and a protrusion is formed at its end by a melting ball process, and the diameter of the protrusion is 0.2mm; a narrow U-shaped groove c is opened on the electrode, and the width of the U-shaped groove c is 0.1mm, thereby firmly clamping the driving wire.

[0058] In an optional implementation, a plurality of limiting grooves 15 are further provided on the outer side of the support structure 1. The fixing portion a of the electrode is fixedly connected to the side of the limiting groove 15 close to the lens holder, and the elastic portion b contacts the side of the limiting groove 15 away from the lens holder, which is used to limit the elastic deformation distance of the elastic portion b in the limiting groove 15, that is, the space for limiting the elastic deformation of the electrode. When the lens driving device A is fixedly connected to the lens housing, the electrode can be prevented from contacting the lens housing and affecting the conduction of electrical signals by the electrode. In this embodiment, the limiting groove 15 can be formed by being surrounded by the inner and outer parts of the support structure 1.

[0059] The first drive line 7 and the second drive line 8 can be shape memory alloy wires. The shape memory alloy wire is achieved by phase transformation between austenite and martensite to achieve expansion or extension. In this embodiment, the diameter of the shape memory alloy wire is 25um, and it can be made of nickel-titanium alloy. Preferably, the shape memory alloy wire can be made of material with model number 5S04007 of SAESGetters. When the external drive circuit applies an electrical signal to the first electrode 3 and the third electrode 5, the temperature of the first drive line 7 gradually increases according to the thermal resistance effect. When the temperature exceeds the phase change temperature, the first drive line 7 expands and contracts, pulling the lens holder 2 to move left along the X-axis; when the external drive circuit applies an electrical signal to the second electrode 4 and the fourth electrode 6, the temperature of the second drive line 8 gradually increases according to the thermal resistance effect. When the temperature exceeds the phase change temperature, the second drive line 8 expands and contracts, pulling the lens holder 2 to move right along the X-axis. When the camera module shakes in the X-axis direction, the image quality caused by the X-axis shake can be compensated by controlling the first drive line 7 and the second drive line 8, thereby achieving optical image stabilization.

[0060] In this embodiment, the first driving wire 7 and the second driving wire 8 can be simultaneously arranged on the top of the support structure 1 and the lens holder 2 or simultaneously arranged on the bottom of the support structure 1 and the lens holder 2, or can be respectively arranged on the top of the support structure 1 and the lens holder 2 and the bottom of the support structure 1 and the lens holder 2. Preferably, the first driving wire 7 and the second driving wire 8 are simultaneously arranged on the top of the support structure 1 and the lens holder 2, so that the controlled extension and retraction of the first driving wire 7 and the second driving wire 8 can pull the lens holder 2 to move precisely along the X-axis direction, avoiding deviation in the moving direction and affecting the quality of the captured image.

[0061] In this embodiment, the lens driving device A further comprises two prestressed adjustment screws 9, which can be detachably connected to the lens bracket 2 in a manner such as Figure 6-Figure 7 As shown. In other implementations, the prestress adjustment screw 9 can be fixedly connected to the lens holder 2 by crimping or dispensing technology. The middle part of the first drive line 7 and the second drive line 8 bypasses the prestress adjustment screw 9 to achieve connection with the lens holder 2. Preferably, the drive line can be set to an isosceles V-shaped structure after bypassing the prestress adjustment screw 9. When the drive line is extended or retracted, the extension lengths of the drive lines on both sides of the prestress adjustment screw are the same, thereby controlling the lens holder 2 to move along the first direction. The prestress adjustment screw 9 is a circular variable cross-section structure. When the depth of the prestress adjustment screw 9 screwed into the lens holder 2 is different, the diameter of the exposed part is different, and the length of the drive line bypassing the prestress adjustment screw 9 is different, thereby achieving the purpose of adjusting the length of the drive line and the pretension during installation.

[0062] The lens holder 2 is also provided with a plurality of lead grooves 21, which are arranged near the prestressed adjustment screw 9 and are used to guide the direction of the corresponding driving wire. This embodiment discloses a lens driving device, which includes a supporting structure, four electrodes, a lens holder and two driving wires. The four electrodes are connected to the supporting structure, and the two driving wires are connected to the corresponding electrodes. The driving wires are configured to drive the lens holder to move along a first direction relative to the supporting structure on a plane perpendicular to the optical axis when the driving wire is controlled to be extended and retracted, and the electrodes are pulled to undergo elastic deformation when the extension and retraction of the driving wire reaches a predetermined threshold. In this way, while achieving optical image stabilization, the driving wire can be well buffered when it is controlled to be extended and retracted, reducing the detachment of the driving wire from the supporting structure or its own breakage, thereby improving the stability and yield of the product.

[0063] Embodiment 2:

[0064] Figure 8 FIG. 1 is a schematic diagram of the structure of a lens driving device according to an embodiment of the present invention. Figure 8 As shown, the difference between the lens driving device of this embodiment and the driving device of the first embodiment is that the lens driving device further includes a fifth electrode 30, a sixth electrode 40, a seventh electrode 50, an eighth electrode 60, a third driving line 70 and a fourth driving line 80. The fifth electrode 30 and the sixth electrode 40 are arranged on the third side 13 of the support structure 1, and the seventh electrode 50 and the eighth electrode 60 are arranged on the fourth side 14 opposite to the third side 13. The two ends of the third driving line 70 are electrically connected to the fifth electrode 30 and the seventh electrode 50 respectively, and the middle part is connected to the lens holder 2 to form a V shape. The two ends of the fourth driving line 80 are electrically connected to the sixth electrode 40 and the eighth electrode 60 respectively, and the middle part is connected to the lens holder 2 to form a V shape in the opposite direction to the third driving line 70. Therefore, the lens holder 2 can be relatively fixedly connected to the support structure 1 through the first driving line 7, the second driving line 8, the third driving line 70 and the fourth driving line 80. The first driving wire 7 and the second driving wire 8 are arranged in a V-shaped structure, so that the first driving wire 7 or the second driving wire 8 can drive the lens holder 2 to move relative to the supporting structure 1 along a first direction (such as Figure 8 The third driving wire 70 and the fourth driving wire 80 are arranged in a V-shaped structure, so that the third driving wire 70 or the fourth driving wire 80 can drive the lens holder 2 to move relative to the supporting structure 1 along the second direction (such as Figure 8 The first direction is perpendicular to the second direction.

[0065] In this embodiment, the first driving wire 7 and the second driving wire 8 are arranged on the top of the support structure 1 and the lens holder 2, and the third driving wire 70 and the fourth driving wire 80 are arranged on the bottom of the support structure 1 and the lens holder 2. Figure 8 As shown, when the four driving lines are arranged crosswise, the accuracy of driving the lens holder 2 to move can be improved. In another optional implementation, the first driving line 7 and the second driving line 8 can be arranged at the bottom of the support structure 1 and the lens holder 2, and the third driving line 70 and the fourth driving line 80 can be arranged at the top of the support structure 1 and the lens holder 2.

[0066] In another optional implementation, the first electrode 3 and the second electrode 4 are arranged on the third side 13 of the support structure 1, the third electrode 5 and the fourth electrode 6 are arranged on the fourth side 14 of the support structure 1, the fifth electrode 30 and the sixth electrode 40 are arranged on the first side 11 of the support structure 1, the seventh electrode 50 and the eighth electrode 60 are arranged on the second side 12 of the support structure 1, the first side 11 and the second side 12 are arranged opposite to each other, and the third side 13 and the fourth side 14 are arranged opposite to each other, as shown in FIG. Fig. 9 As shown. The two ends of the first driving line 7 are respectively physically and electrically connected to the first electrode 3 and the second electrode 4 in a relatively fixed manner, and the middle part is connected to the lens driving device 2 to form a V-shape. The two ends of the second driving line 8 are respectively physically and electrically connected to the third electrode 5 and the fourth electrode 6 in a relatively fixed manner, and the middle part is connected to the lens holder 2 to form a V-shape in the opposite direction to the first driving line 7. The two ends of the third driving line 70 are respectively physically and electrically connected to the fifth electrode 30 and the sixth electrode 40 in a relatively fixed manner, and the middle part is connected to the lens driving device 2 to form a V-shape. The two ends of the fourth driving line 80 are respectively physically and electrically connected to the seventh electrode 50 and the eighth electrode 60 in a relatively fixed manner, and the middle part is connected to the lens holder 2 to form a V-shape in the opposite direction to the third driving line 70. The first driving line 7 and the second driving line 8 are set to a V-shaped structure, so that the first driving line 7 or the second driving line 8 can drive the lens holder 2 to move relative to the support structure 1 along the first direction (such as Fig. 9 The third driving wire 70 and the fourth driving wire 80 are arranged in a V-shaped structure, so that the third driving wire 70 or the fourth driving wire 80 can drive the lens holder 2 to move relative to the supporting structure 1 along the second direction (such as Fig. 9 The first direction is perpendicular to the second direction.

[0067] In this embodiment, the four driving lines can be simultaneously arranged on the top or bottom of the support structure 1 and the lens holder 2, or can be separately arranged on the top or bottom of the support structure 1 and the lens holder 2. Fig.10 shown.

[0068] The embodiment of the present invention discloses a lens driving device, which includes a support structure, multiple electrodes, a lens holder and multiple driving wires. The multiple electrodes are connected to the support structure, and the multiple driving wires are connected to the corresponding electrodes. The driving wires are configured to drive the lens holder to move relative to the support structure on a plane perpendicular to the optical axis when the driving wires are controlled to expand and contract. When the expansion and contraction of the driving wires reaches a predetermined threshold, the electrodes are pulled to undergo elastic deformation. In this way, while achieving optical image stabilization, the driving wires can be well buffered when they are controlled to expand and contract, reducing the possibility of the driving wires falling off the support structure or breaking themselves, thereby improving the stability and yield of the product.

[0069] Embodiment three:

[0070] This embodiment also provides a camera module, which includes a lens housing B, an optical lens group C, a photosensitive element D (not shown in the figure), a vibration sensor E and a lens driving device A. Fig.11 As shown. The lens driving device A is the same as the lens driving device A in the first or second embodiment, and is disposed in the lens housing B. The vibration sensor E is disposed in the lens housing B and connected to the lens driving device A. The vibration sensor E can be any sensor that can be used to detect the motion parameters of the device, such as an acceleration sensor, an angular velocity sensor, etc. The optical lens group C is disposed in the lens bracket 2 of the lens driving device A, as shown in FIG. Fig.11 As shown. The optical lens group C can have any number of optical lenses. The photosensitive element D is arranged in the lens housing B, opposite to the optical lens group C, and is used to capture the image signal transmitted by the optical lens group C, so as to control the lens driving device A to move the optical lens group C in any direction perpendicular to the optical axis plane. The photosensitive element D can be a charge coupled device or a complementary metal oxide semiconductor chip. The camera module of this embodiment can detect the state of movement of the device by sensing the vibration sensor E in the application device, and correspondingly, by controlling the intensity of the electrical signal applied to the corresponding electrode, the translation amount of the optical lens group C can be controlled to achieve reverse compensation, so as to control the stable imaging of the captured image on the photosensitive element D.

[0071] The lens driving device A and the camera module of the embodiment of the present invention can be applied to any electronic device with a camera function, such as a mobile phone, a tablet computer, a notebook computer, a drone, a car camera system, etc.

[0072] The embodiment of the present invention discloses a lens driving device and a camera module, wherein the lens driving device includes a support structure, a plurality of electrodes, a lens holder and a plurality of driving wires, wherein the plurality of electrodes are connected to the support structure, and the plurality of driving wires are connected to the corresponding electrodes, and the driving wires are configured to drive the lens holder to move relative to the support structure on a plane perpendicular to the optical axis when the driving wires are controlled to expand and contract, and the electrodes are pulled to undergo elastic deformation when the expansion and contraction of the driving wires reaches a predetermined threshold. Thus, while achieving optical image stabilization, the driving wires can be well buffered when they are controlled to expand and contract, reducing the possibility of the driving wires falling off the support structure or breaking themselves, thereby improving the stability and yield of the product.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lens driving device, comprising: A supporting structure, with a plurality of limit grooves arranged on the outer side; A lens bracket, used for fixing the optical lens group; A plurality of electrodes connected to the support structure, configured to undergo elastic deformation when the tension received is greater than a predetermined threshold value and to remain unchanged in shape when the tension received is less than or equal to the predetermined threshold value, the electrodes comprising an integrally formed fixing portion and an elastic portion, the fixing portion being fixedly connected to a side edge of the support structure of the limiting groove close to the lens holder, the elastic portion being in contact with a side edge of the support structure of the limiting groove away from the lens holder, and the limiting groove being used to limit the space for elastic deformation of the electrode; A plurality of driving wires are fixedly physically and electrically connected to the corresponding electrodes, the driving wires are configured to drive the lens holder to move relative to the support structure on a plane perpendicular to the optical axis when the driving wires are controlled to be extended or retracted, the two ends of the driving wires are connected to the elastic parts of the corresponding electrodes, and the driving wires pull the corresponding elastic parts to undergo elastic deformation when the controlled extension or retraction of the driving wires exceeds an extension or retraction threshold; A prestressed adjustment screw is detachably connected to the lens holder, and the middle portion of the drive line bypasses the prestressed adjustment screw and is connected to the lens holder. The tension of the drive line is adjusted by the different depths of the prestressed adjustment screw screwed into the lens holder.

2. The lens driving device according to claim 1, characterized in that: The plurality of electrodes include a first electrode, a second electrode, a third electrode and a fourth electrode, the first electrode and the second electrode are arranged on a first side of the support structure, and the third electrode and the fourth electrode are arranged on a second side opposite to the first side; The multiple driving lines include a first driving line and a second driving line, wherein two ends of the first driving line are electrically connected to the first electrode and the third electrode respectively, and a middle portion is connected to the lens holder, and two ends of the second driving line are electrically connected to the second electrode and the fourth electrode respectively, and a middle portion is connected to the lens holder, and the first driving line and the second driving line are configured to drive the lens holder to move along a first direction relative to the supporting structure when being controlled to retract or contract.

3. The lens driving device according to claim 2, characterized in that: The plurality of electrodes further include a fifth electrode, a sixth electrode, a seventh electrode and an eighth electrode, the fifth electrode and the sixth electrode are arranged on a third side of the support structure, and the seventh electrode and the eighth electrode are arranged on a fourth side opposite to the third side; The multiple driving lines also include a third driving line and a fourth driving line, wherein two ends of the third driving line are electrically connected to the fifth electrode and the seventh electrode respectively, and a middle portion is connected to the lens holder, and two ends of the fourth driving line are electrically connected to the sixth electrode and the eighth electrode respectively, and a middle portion is connected to the lens holder, and the third driving line and the fourth driving line are configured to drive the lens holder to move relative to the support structure along a second direction perpendicular to the first direction when they are controlled to be extended and retracted.

4. The lens driving device according to claim 3, characterized in that: The first driving wire and the second driving wire are arranged on the top of the supporting structure and the lens holder, and the third driving wire and the fourth driving wire are arranged on the bottom of the supporting structure and the lens holder.

5. The lens driving device according to claim 1, characterized in that: One side of the elastic part has a U-shaped groove, and both ends of the driving line have protrusions, and the driving line is fixed relative to the U-shaped groove through the protrusions.

6. The lens driving device according to claim 1, characterized in that: The prestressed pressure adjusting screw is a circular variable cross-section structure.

7. The lens driving device according to claim 1, characterized in that: The lens support is provided with a plurality of guide grooves, which are respectively used to guide the directions of the driving wires.

8. A camera module, comprising: Lens housing; The lens driving device according to any one of claims 1 to 7, arranged in the lens housing; An optical lens group, arranged in the lens driving device; A photosensitive element, arranged opposite to the optical lens group; The vibration sensor is arranged in the lens housing and is used to detect and obtain the vibration signal of the lens driving device.

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