Lens driving device

Abstract

According to the lens driving device provided by the invention, long-stroke automatic focusing can be realized with high precision. The lens driving device comprises a base which comprises a bottom surface, a first side wall and a second side wall; a housing; the lens driving device is characterized in that the lens driving device is provided with a driving rod capable of rotating around a rotating shaft within a specified angle range, and the driving rod is provided with a root part close to the rotating shaft and a front end part far away from the rotating shaft; the memory metal wire is provided with one end serving as a driving end and the other end serving as a fixed end, the driving end is arranged at the root part of the driving rod, one side surface of the lens holding part is provided with a bearing part which abuts against the front end part of the driving rod, and in an assembling state, the bearing part is exposed from a gap between the first side wall and the second side wall; under the condition that the memory metal wire is electrified, the memory metal wire contracts, the driving rod rotates around the rotating shaft, and the front end part of the driving rod pushes the receiving part to enable the lens holding part to move along the optical axis direction.

Description

Technical Field

[0001] The invention relates to a lens driving device. Background Art

[0002] In the past, in a lens driving device (refer to patent document 1), the lens holding part is driven by a shape memory metal wire (Shape Memory Alloy Wire, SMA wire) with shape memory properties, and the two ends of the memory metal wire are respectively fixed on the upper side of the base, and a holding part is provided at the corner of the lower side of the lens holding part, and the middle part of the memory metal wire abuts against the lower side of the holding part. Therefore, when the memory metal wire contracts, its middle part will pull the lens holding part to move upward, thereby realizing the automatic focusing function. However, the lens driving device drives the movement of the lens holding part by contracting a memory metal wire, and can only realize movement in a single direction (for example, upward). In addition, the contraction length of the memory metal wire determines the moving distance of the lens holding part, so the stroke length of the lens holding part is limited. That is, the lens driving device cannot realize long-stroke automatic focusing with high precision.

[0003] In another lens driving device (refer to patent document 2), the two ends of a memory metal wire are respectively fixed on the upper side of the base, the two ends of the elastic member are respectively fixed on the lower side of the base, and a boss is provided on the side of the lens holding part. The middle part of the memory metal wire abuts against the lower side of the boss, and the middle part of the elastic member abuts against the upper side of the boss. Therefore, when the memory metal wire contracts, its middle part will pull the lens holding part to move in the first direction. At this time, an elastic force in a second direction opposite to the first direction is generated by the abutment between the elastic member and the upper side of the boss, thereby realizing the return function. However, the lens driving device also drives the movement of the lens holding part by the contraction of a memory metal wire, and can only realize movement in a single direction (for example, the first direction). In addition, the contraction length of the memory metal wire determines the moving distance of the lens holding part, so the stroke length of the lens holding part is limited. That is, the lens driving device cannot realize long-stroke automatic focusing with high precision.

[0004] Prior art literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 5250544

[0006] Patent Document 2: China Patent Announcement No. CN218283428U Summary of the invention

[0007] Technical Problems to be Solved by the Invention

[0008] In the above two lens driving devices, the lens holding part is driven to move in one direction by a memory metal wire, so the lens holding part can only move in one direction, and the stroke length of the lens holding part is limited by the contraction length of the memory metal wire. Therefore, it is impossible to achieve long-stroke automatic focusing with high precision.

[0009] The present invention has been made in view of the above-mentioned technical problems, and an object of the present invention is to provide a lens driving device capable of realizing autofocusing over a long stroke with high accuracy.

[0010] Means used to solve problems

[0011] According to the lens driving device of the present invention, it comprises: a base, including a bottom surface, and a first side wall and a second side wall which are perpendicular to the bottom surface and located in the same plane with each other; a shell, which is covered on the base and forms a storage space with the base; and a lens holding part, which is arranged in the storage space. The lens driving device is characterized in that it comprises: a driving rod which can rotate around a rotation axis within a specified angle range, the axis direction of the rotation axis is perpendicular to the optical axis direction, the driving rod has a root portion close to the rotation axis and a front end portion away from the rotation axis; and a memory metal wire, which has one end as a driving end and the other end as a fixed end, the driving end is arranged at the root portion of the driving rod, and a receiving part which abuts against the front end portion of the driving rod is arranged on one side of the lens holding part, and in the assembled state, the receiving part is exposed from the notch between the first side wall and the second side wall; when the memory metal wire is energized, the memory metal wire contracts, so that the driving rod rotates around the rotation axis, and the front end portion of the driving rod pushes the receiving part to move the lens holding part along the optical axis direction.

[0012] Thus, when the memory wire contracts, the drive rod is pulled, and the receiving portion is pushed by the contact between the drive rod and the receiving portion, so that the lens holding portion moves along the optical axis. Here, based on the lever principle centered on the rotation axis of the drive rod, the shorter contraction distance of the memory wire is converted into a longer rotation distance of the front end of the drive rod, so that the movement distance of the lens holding portion is not limited by the contraction distance of the memory wire but corresponds to the rotation distance of the front end of the drive rod. Thus, long-stroke autofocus can be achieved with high precision. Moreover, by rotating the drive rod in different directions, the lens holding portion can be moved in both directions, and the stroke length of the lens holding portion can be increased, so that long-stroke autofocus can be further achieved with high precision.

[0013] According to the lens driving device of the present invention, it is characterized in that an attraction magnet is provided in the receiving portion, and a metal component is provided inside the driving rod, and the front end portion of the driving rod is kept in contact with the receiving portion through the attraction force between the attraction magnet and the metal component.

[0014] Thus, the contact between the driving lever and the receiving portion can be reliably maintained, thereby achieving long-stroke autofocus with high accuracy.

[0015] The lens driving device according to the present invention is characterized in that the memory metal wire comprises two memory metal wires including a first memory metal wire and a second memory metal wire, the first memory metal wire rotates the front end portion of the driving rod in a manner that the receiving portion moves along the optical axis in a direction away from the bottom surface, and the second memory metal wire rotates the front end portion of the driving rod in a manner that the receiving portion moves along the optical axis in a direction close to the bottom surface.

[0016] According to the lens driving device of the present invention, it is characterized in that the driving rod comprises two driving rods including a first driving rod and a second driving rod, the rotation axis of the first driving rod is arranged on the second side wall, the rotation axis of the second driving rod is arranged on the first side wall, and the receiving portion is clamped between the first driving rod and the second driving rod.

[0017] The lens driving device according to the present invention is characterized in that the fixed end of the first memory metal wire is arranged at the part of the first side wall away from the bottom surface, the driving end of the first memory metal wire is arranged at the part of the first driving rod close to the bottom surface, the fixed end of the second memory metal wire is arranged at the part of the second side wall close to the bottom surface, and the driving end of the second memory metal wire is arranged at the part of the second driving rod away from the bottom surface.

[0018] The lens driving device according to the present invention is characterized in that the first memory metal wire and the second memory metal wire are arranged in parallel.

[0019] Thus, the first memory metal wire and the second memory metal wire respectively rotate the driving rod in different directions, so that the lens holding part can move in both directions from the initial position. Thus, by realizing the movement of the lens holding part in both directions, the stroke length of the lens holding part can be increased, and long-stroke automatic focusing can be realized with high precision. In addition, since the first memory metal wire and the second memory metal wire are arranged in parallel, the space required for arranging the first memory metal wire and the second memory metal wire can be reduced, thereby improving the compactness of the structure of the lens driving device.

[0020] The lens driving device according to the present invention is characterized in that the driving rod is one driving rod, the front end portion of the driving rod has a receiving portion, and the receiving portion is located in the receiving portion.

[0021] The lens driving device according to the present invention is characterized in that the rotating axis of the driving rod is arranged on one of the first side wall and the second side wall, the fixed end of the first memory metal wire and the fixed end of the second memory metal wire are respectively arranged on the other of the first side wall and the second side wall, the driving end of the first memory metal wire and the driving end of the second memory metal wire are respectively arranged on the parts on both sides of the rotating axis of the driving rod, the driving end of the first memory metal wire is arranged on the side of the rotating axis close to the bottom surface, and the driving end of the second memory metal wire is arranged on the side of the rotating axis away from the bottom surface.

[0022] Thus, the bidirectional movement of the lens holding part can be realized by one driving rod, and long-stroke autofocus can be realized with high precision, while the structure of the lens driving device can be simplified. Furthermore, the contact between the driving rod and the receiving part can be more reliably maintained.

[0023] The lens driving device according to the present invention is characterized in that it also has a leaf spring that supplies power to the metal component and is fixed to the base. The base has a metal circuit. One end of the leaf spring is connected to the metal component, and the other end is connected to the metal circuit. The two ends of the memory metal wire are respectively clamped by metal clips. The metal clip at the driving end is connected to the metal component, and the metal clip at the fixed end is connected to the metal circuit.

[0024] The lens driving device according to the present invention is characterized in that the metal component is made of a magnetic metal material.

[0025] According to the lens driving device of the present invention, the driving rod is obtained by insert molding the metal component.

[0026] This makes it possible to more reliably maintain the contact between the drive lever and the receiving portion, thereby achieving long-stroke autofocus with high accuracy.

[0027] The lens driving device according to the present invention is characterized by further comprising a Hall element for detecting the position of the lens holding portion along the optical axis direction by detecting the relative position of the attraction magnet.

[0028] Thus, by detecting the position of the attraction magnet in the contact portion, the position of the lens holding portion along the optical axis direction is detected, so that the position of the lens holding portion can be detected with high accuracy and the number of components can be reduced, thereby simplifying the structure of the lens driving device.

[0029] According to the lens driving device of the present invention, it is characterized in that a pair of guide shafts are arranged on the base and are perpendicular to the bottom surface, the pair of guide shafts are located on the side of the receiving part close to the optical axis, a guide magnet is arranged on the side of the base opposite to the receiving side, and a guide plate opposite to the guide magnet is arranged on the lens holding part, and the lens holding part is made to be in close contact with the pair of guide shafts through the attraction between the guide magnet and the guide plate.

[0030] Thus, by providing the guide shaft, the guide magnet, and the guide plate, the movement of the lens holding portion in the optical axis direction can be guided, and long-stroke autofocus can be achieved with high accuracy.

[0031] Effects of the Invention

[0032] According to the lens driving device of the present invention, the lens holding part can be moved in both directions, and the moving distance of the lens holding part is not limited to the contraction length of the memory metal wire. The stroke length of the lens holding part can be increased, and long-stroke automatic focusing can be achieved with high precision.

[0033] Furthermore, according to the lens driving device of the present invention, the number of components in the lens driving device can be reduced, thereby achieving simplification and compactness of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an exploded perspective view of the lens driving device.

[0035] Figure 2 It is a three-dimensional diagram of the base of the lens driving device.

[0036] Figure 3 This is a front view of the drive rod and memory wire in the assembled state of the lens drive device.

[0037] Figure 4 It is a front view of the first driving rod and the second driving rod.

[0038] Figure 5 It is an exploded perspective view of the first driving rod and the second driving rod.

[0039] Figure 6 This is a front view of the lens holding part moving in one direction.

[0040] Figure 7 This is a front view of the lens holding part moving in the other direction.

[0041] Figure 8 It is a perspective view of a power supply mechanism of the lens driving device.

[0042] Fig. 9 This is a front view of the lens drive device with the housing removed.

[0043] Fig.10 is along Fig. 9 A cross-sectional top view of the lens driving device taken along line AA' in FIG.

[0044] Fig.11 It is an exploded perspective view of a lens driving device according to a modified example.

[0045] Fig.12 It is a front view of a drive rod and a memory wire in an assembled state of a lens drive device according to a modified example.

[0046] Fig.13 It is an exploded perspective view of a drive rod according to a modified example.

[0047] Fig.14 This is a front view of the lens holding portion of the modified example moving in one direction.

[0048] Fig.15 This is a front view of the lens holding portion of the modified example moved in the other direction.

[0049] Description of reference numerals:

[0050] 100 lens driving device; 1 base; 11 first side wall; 12 second side wall; 13 bottom surface; 2 housing; 3 lens holding part; 31 receiving part; 32 attracting magnet; 4 driving rod; 41 first driving rod; 411 first rotating shaft; 412, 422 root; 413, 423 front end; 42 second driving rod; 421 second rotating shaft; 43, 44 metal parts; SA, SA1, SA2 memory metal wire; SA11, SA21 driving end; SA12, SA22 fixed end; 7 guiding mechanism; 71, 72 a pair of guiding shafts; 73 guiding magnet; 74 guiding plate; 8 power supply mechanism; 81, 82 leaf spring; 83 metal circuit; 91 1 first driving metal clip; 912 first fixed metal clip; 921 second driving metal clip; 922 second fixed metal clip; 200 lens driving device; 201 base; 202 housing; 23 lens holding part; 231 receiving part; 232 attracting magnet; 24 driving rod; 241 first front end portion; 242 second front end portion; 243 front end portion; 244 rotating shaft; 245 root; 249 metal part; 291 first driving metal clip; 292 second driving metal frame; 293 first fixed metal clip; 294 second fixed metal frame; SA3, SA4 memory metal wires; SA31, SA41 driving end; SA32, SA42 fixed end. DETAILED DESCRIPTION

[0051] (First Embodiment)

[0052] Hereinafter, a lens driving device 100 according to an embodiment of the present invention will be described with reference to the drawings. Figure 1It is an exploded perspective view of the lens driving device 100 . Figure 2 1 is a perspective view of the base 1 of the lens driving device 100 of the present invention. Figure 3 It is a front view of the drive rod 4 and the memory wire SA in the assembled state of the lens drive device 100 .

[0053] In each figure, X1 represents one direction of the X-axis constituting a three-dimensional orthogonal coordinate system, and X2 represents another direction of the X-axis. In addition, Y1 represents one direction of the Y-axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents another direction of the Y-axis. Similarly, Z1 represents one direction of the Z-axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents another direction of the Z-axis. In addition, the Z-axis direction is parallel to the optical axis direction L of the lens LS not shown. Furthermore, in each figure, the X1 side of the lens driving device 100 is equivalent to the front side (front side) of the lens driving device 100, and the X2 side of the lens driving device 100 is equivalent to the rear side (back side) of the lens driving device 100. In addition, the Y1 side of the lens driving device 100 is equivalent to the left side of the lens driving device 100, and the Y2 side of the lens driving device 100 is equivalent to the right side of the lens driving device 100. The Z1 side of the lens driving device 100 corresponds to the upper side (farther from the bottom surface) of the camera module lens driving device 100 , and the Z2 side of the lens driving device 100 corresponds to the lower side (closer to the bottom surface) of the lens driving device 100 .

[0054] In addition, in each drawing, part of the illustration is omitted for convenience of explanation, and only the shown part is described.

[0055] like Figure 1 As shown, the lens driving device 100 includes a base 1 , a housing 2 , and a lens holding portion 3 .

[0056] (Base 1)

[0057] like Figure 2 As shown, the base 1 includes a bottom surface 13, a first side wall 11 and a second side wall 12. The first side wall 11 and the second side wall 12 are respectively perpendicular to the bottom surface 13, and the first side wall 11 and the second side wall 12 are located in the same plane.

[0058] like Figure 1 As shown, the housing 2 is covered on the base 1 in the assembled state, and a receiving space S (not shown) is formed between the housing 2 and the base 1. The housing 2 can be formed of synthetic resin or non-magnetic metal. Figure 1 As shown, the housing 2 has an outer shape that defines a housing space S for housing the lens holding portion 3. In addition, in the present embodiment, an opening for exposing a lens LS (not shown in the drawings) is formed on the top surface (surface in the Z1 direction) of the housing 2, and the shape of the opening is substantially the same as the shape of the lens LS.

[0059] (Lens holding part 3)

[0060] The lens holding portion 3 is disposed in a storage space S formed by the housing 2 and the base 1 .

[0061] like Figure 3 As shown, the lens driving device 100 further includes a driving rod 4 and a memory metal wire SA. Figure 3 In the figure, part of the illustration is omitted for convenience of explanation, and only the shown part is explained.

[0062] (Drive rod 4)

[0063] like Figure 3 As shown, in this embodiment, the driving rod 4 includes a first driving rod 41 and a second driving rod 42 .

[0064] The first drive rod 41 is provided on the second side wall 12 and supported by the first rotation axis 411 so as to be rotatable around the first rotation axis 411 within a predetermined angle range. The axial direction of the first rotation axis 411 of the first drive rod 41 is perpendicular to the optical axis direction L (Z-axis direction). The first drive rod 41 includes a root portion 412 close to the first rotation axis 411 and a front end portion 413 away from the first rotation axis 411. The first drive rod 41 is formed, for example, as a rod-shaped member extending from the root portion 412 to the front end portion 413.

[0065] The second drive rod 42 is provided on the first side wall 11 and supported by the second rotation axis 421 so as to be rotatable around the second rotation axis 421 within a predetermined angle range. The axial direction of the second rotation axis 421 of the second drive rod 42 is perpendicular to the optical axis direction L (Z-axis direction). The second drive rod 42 includes a root portion 422 close to the second rotation axis 421 and a front end portion 423 away from the second rotation axis 421. The second drive rod 42 is formed, for example, as a rod-shaped member extending from the root portion 422 to the front end portion 423.

[0066] (Metal parts 43, 44)

[0067] Reference Figure 4 , 5 The metal members 43 and 44 will be described. Figure 4 It is a front view of the first driving rod 41 and the second driving rod 42 . Figure 5 4 is an exploded perspective view of the first driving rod 41 and the second driving rod 42. Figure 4 , 5 In the figure, for the sake of convenience, a part of the illustration is omitted, and only the first driving rod 41, the second driving rod 42 and the metal parts 43 and 44 are described. Figure 4 In the figure, the first driving rod 41 and the second driving rod 42 are shown transparently for the convenience of explanation.

[0068] like Figure 4 , 5 As shown, metal parts 43 and 44 are respectively provided inside the first driving rod 41 and the second driving rod 42. The metal parts 43 and 44 are made of magnetic metal materials, for example. The metal parts 43 and 44 are respectively embedded in the first driving rod 41 and the second driving rod 42 by insert molding. The metal parts 43 and 44 are respectively formed in the shape along the first driving rod 41 and the second driving rod 42.

[0069] For example, the metal member 43 is formed into a strip extending from a position corresponding to the root 412 of the first drive rod 41 to a position corresponding to the front end 413. In order to form an attraction force with the attraction magnet 32 ​​in the receiving portion 31 described later, the metal member 43 is bent at a position corresponding to the front end 413 to extend horizontally.

[0070] Similarly, the metal member 44 is formed into a strip extending from a position corresponding to the root 422 of the second drive rod 42 to a position corresponding to the front end 423. In order to form an attraction force with the attraction magnet 32 ​​in the receiving portion 31 described later, the metal member 44 is bent at a position corresponding to the front end 423 to extend horizontally.

[0071] In addition, the metal components 43 and 44 may also be disposed inside the first driving rod 41 and the second driving rod 42 by other methods.

[0072] (Memory Metal Wire SA)

[0073] In this embodiment, the memory metal wire SA includes a memory metal wire SA1 and a memory metal wire SA2 .

[0074] like Figure 3 As shown, the memory metal wire SA1 includes one end as a driving end SA11 and the other end as a fixed end SA12. The driving end SA11 of the memory metal wire SA1 is disposed at a portion of the first driving rod 41 close to the bottom surface 13, for example, substantially below the first rotating shaft 411 of the first driving rod 41. The fixed end SA12 of the memory metal wire is disposed at a portion of the first side wall 11 away from the bottom surface 13.

[0075] The memory metal wire SA2 includes one end as a driving end SA21 and the other end as a fixed end SA22. The driving end SA21 of the memory metal wire SA2 is disposed at a portion of the second driving rod 42 away from the bottom surface 13, for example, substantially above the second rotating shaft 421 of the second driving rod 42. The fixed end SA22 of the memory metal wire is disposed at a portion of the second side wall 12 close to the bottom surface 13.

[0076] Specifically, a first fixing metal clip 912 and a second fixing metal clip 922 are respectively disposed on the first side wall 11 and the second side wall 12. The first fixing metal clip 912 is disposed at a position of the first side wall 11 away from the bottom surface 13. The second fixing metal clip 922 is disposed at a position of the second side wall 12 close to the bottom surface 13.

[0077] A first driving metal clip 911 and a second driving metal clip 921 are respectively provided on the first driving rod 41 and the second driving rod 42. The first driving metal clip 911 is provided at a position close to the bottom surface 13 of the root 412 of the first driving rod 41, for example, provided substantially below the first rotation axis 411 of the root 412 of the first driving rod 41. The second driving metal clip 921 is provided at a position away from the bottom surface 13 of the root 422 of the second driving rod 42, for example, provided substantially above the second rotation axis 421 of the root 422 of the second driving rod 42.

[0078] In addition, the first driving metal clip 911 and the second driving metal clip 921 are mechanically and electrically connected to the metal components 43 and 44 , respectively, and the first fixing metal clip 912 and the second fixing metal clip 922 are mechanically and electrically connected to the metal circuit 83 described later, respectively.

[0079] Specifically, the driving end SA11 of the memory metal wire SA1 is clamped by the first driving metal clip 911, and the fixed end SA12 is clamped by the first fixed metal clip 912. The driving end SA21 of the memory metal wire SA2 is clamped by the second driving metal clip 921, and the fixed end SA22 is clamped by the second fixed metal clip 922. In addition, the first driving metal clip 911 and the second driving metal clip 921, and the first fixed metal clip 912 and the second fixed metal clip 922 are respectively arranged symmetrically. Thus, when both ends of the memory metal wire SA1 are clamped by the first driving metal clip 911 and the first fixed metal clip 912, respectively, and both ends of the memory metal wire SA2 are clamped by the second driving metal clip 921 and the second fixed metal clip 922, respectively, the memory metal wire SA1 and the memory metal wire SA2 are formed to be substantially parallel.

[0080] Therefore, in the lens driving device 100 of the present embodiment, even if two memory wires SA are arranged, the space required for providing the memory wires SA1 and SA2 can be reduced, and the structure of the lens driving device 100 can be made more compact.

[0081] (Receiving section 31)

[0082] like Figure 3As shown, a receiving portion 31 is provided on the side of the lens holding portion 3 facing the first driving rod 41 and the second driving rod 42. The receiving portion 31 is formed, for example, to protrude from the side of the lens holding portion 3 in the X1 direction. In addition, in the assembled state, the receiving portion 31 is exposed from the notch between the first side wall 11 and the second side wall 12, and further protrudes in the X1 direction. When viewed from the Z1 direction, the front end portion 413 of the first driving rod 41, the receiving portion 31, and the front end portion 423 of the second driving rod 42 are roughly overlapped.

[0083] In this embodiment, for example, the first drive rod 41 and the second drive rod 42 are formed such that the front end 413 of the first drive rod 41 is located below the receiving portion 31 (in the Z2 direction), and the front end 423 of the second drive rod 42 is located above the receiving portion 31 (in the Z1 direction), that is, when viewed from the Z1 direction, the front end 423 of the second drive rod 42, the receiving portion 31, and the front end 413 of the first drive rod 41 overlap in this order and contact each other. In other words, the receiving portion 31 is sandwiched between the first drive rod 41 and the second drive rod 42.

[0084] An attraction magnet 32 ​​is provided in the receiving portion 31. The attraction magnet 32 ​​is composed of, for example, a magnetized permanent magnet. The front end portion 413 of the first driving rod 41 is kept in contact with the lower surface of the receiving portion 31 by the attraction force between the metal component 43 in the first driving rod 41 and the attraction magnet 32 ​​in the receiving portion 31. Similarly, the front end portion 423 of the second driving rod 42 is kept in contact with the upper surface of the receiving portion 32 by the attraction force between the metal component 44 in the second driving rod 42 and the attraction magnet 32 ​​in the receiving portion 31.

[0085] In addition, in order to achieve that the front end portion 413 of the first driving rod 41 and the front end portion 423 of the second driving rod 42 push the receiving portion 31 respectively and move the lens holding portion 3 along the optical axis direction L, the lower surface and the upper surface of the receiving portion 31 that are in contact with the front end portion 413 of the first driving rod 41 and the front end portion 423 of the second driving rod 42 are respectively formed as arc surfaces. Thus, for example, when the front end portion 413 of the first driving rod 41 rotates around the first rotating shaft 411, the front end portion 413 of the first driving rod 41 can be kept in contact with the lower surface of the receiving portion 31 by the attraction between the metal component 43 and the attraction magnet 32 ​​in the receiving portion 31. The same is true for the upper surface of the receiving portion 31.

[0086] Thus, during the process of driving the lens holding portion 3 to move, the first driving rod 41 and the second driving rod 42 always keep in contact with the receiving portion 31. Therefore, there will be no problem of idle stroke or the like that affects the driving accuracy. Thus, long-stroke autofocus can be achieved with high accuracy.

[0087] In addition, in this embodiment, the surface of the receiving portion 31 that abuts against the first drive rod 41 and the second drive rod 42 can also be formed into other shapes, as long as the first drive rod 41 and the second drive rod 42 can remain in contact with the receiving portion 31 during the movement of the lens holding portion 3.

[0088] (Movement of Lens Holding Unit 3)

[0089] Below, use Figure 6 , 7 The movement of the lens holding unit 3 will be described. Figure 6 This is a front view of the lens holding portion 3 moving in one direction. Figure 7 3 is a front view of the lens holding part 3 moving in another direction. Figure 6 , 7 In the figure, part of the illustration is omitted for convenience of explanation, and only the shown part is explained.

[0090] The memory metal wires SA1 and SA2 are made of, for example, shape memory metal. When electricity is applied to the memory metal wires SA1 and SA2, their temperatures rise, and the memory metal wires SA1 and SA2 shrink in accordance with the temperature rise.

[0091] like Figure 6 As shown, when the memory metal wire SA1 is energized, the memory metal wire SA1 contracts. At this time, the fixed end SA12 of the memory metal wire SA1 is clamped by the first fixed metal clip 912 on the first side wall 11, and the driving end SA11 is clamped by the first driving metal clip 911 on the first driving rod 41. Therefore, when the memory metal wire SA1 contracts, the fixed end SA12 is fixed and the driving end SA11 contracts toward the fixed end SA12 (as shown in the direction S1 in the figure), thereby, the memory metal wire SA1 pulls the first driving rod 41 to rotate around the first rotating shaft 411 via the first driving metal clip 911. At this time, the front end 413 of the first driving rod 41 pushes the receiving portion 31 to move the lens holding portion 3 along the optical axis direction L.

[0092] Specifically, when the memory metal wire SA1 contracts, the fixed end SA12 is fixed and the driving end SA11 contracts toward the fixed end SA12, the front end portion 413 of the first driving rod 41 rotates around the first rotating axis 411 in a direction (Z1 direction) away from the bottom surface 13 (as shown in the direction S2 in the figure). As a result, the front end portion 413 of the first driving rod 41 pushes the receiving portion 31 to move the lens holding portion 3 in a direction (Z1 direction) away from the bottom surface 13 (as shown in the direction S3 in the figure).

[0093] like Figure 7As shown, when the memory metal wire SA2 is energized, the memory metal wire SA2 contracts. At this time, the fixed end SA22 of the memory metal wire SA2 is clamped by the second fixed metal clip 922 on the second side wall 12, and the driving end SA21 is clamped by the second driving metal clip 921 on the second driving rod 42. Therefore, when the memory metal wire SA2 contracts, the fixed end SA22 is fixed and the driving end SA21 contracts toward the fixed end SA22 (as shown in the direction S4 in the figure), thereby, the memory metal wire SA2 pulls the second driving rod 42 to rotate around the second rotating shaft 421 via the second driving metal clip 921. At this time, the front end 423 of the second driving rod 42 pushes the receiving portion 31 to move the lens holding portion 3 along the optical axis direction L.

[0094] Specifically, when the memory metal wire SA2 contracts, the fixed end SA22 is fixed and the driving end SA21 contracts toward the fixed end SA22, the front end portion 423 of the second driving rod 42 rotates around the second rotating axis 421 toward the direction (Z2 direction) close to the bottom surface 13 (as shown in the direction S5 in the figure). As a result, the front end portion 423 of the second driving rod 42 pushes the receiving portion 31 to move the lens holding portion 3 toward the direction (Z2 direction) close to the bottom surface 13 (as shown in the direction S6 in the figure).

[0095] Thus, the lens holding portion can be moved in the optical axis direction L by energizing the memory wire SA1 or the memory wire SA2.

[0096] In addition, for example, when the lens holding part 3 is in the original position, the memory wire SA1 and the memory wire SA2 are pre-energized based on a small initial current to keep them in a tensioned state. When one of the memory wire SA1 and the memory wire SA2 is used as a driving memory wire and the lens holding part 3 is moved by contracting the driving memory wire, the current in the driving memory wire is increased, and the current in the other memory wire is reduced, thereby coordinating the contraction action of the driving memory wire.

[0097] Furthermore, a lever principle is formed in the first driving rod 41 and the second driving rod 42 .

[0098] like Figure 3As shown, in the first driving rod 41, the first driving rod 41 is rotated by pulling the root 412 by contraction of the memory metal wire SA1, and the lens holding part 3 is moved in a direction away from the bottom surface 13 by pushing the receiving part 31 by the rotation of the front end 412. At this time, a main force arm is formed between the position where the first fixed metal clip 912 is provided at the root 412 of the first driving rod 41 and the first rotating shaft 411, and a slave force arm is formed between the position where the front end 413 of the first driving rod 41 contacts the receiving part 31 and the first rotating shaft 411, thereby forming a "lever" with the first rotating shaft 411 as a fulcrum in the first driving rod 41. In addition, the length of the main force arm is much smaller than the length of the slave force arm.

[0099] Likewise, Figure 3 As shown, in the second driving rod 42, a main force arm is formed between the position where the second fixing metal clip 922 is provided at the root 422 of the second driving rod 42 and the second rotating shaft 421, and a slave force arm is formed between the position where the front end 423 of the second driving rod 42 contacts the receiving portion 31 and the second rotating shaft 421, thereby forming a "lever" with the second rotating shaft 421 as a fulcrum in the second driving rod 42. In addition, the length of the main force arm is much smaller than that of the slave force arm.

[0100] Thus, the memory wire SA1 or the memory wire SA2 only needs to shrink a short shrinking distance, and the front end portion 413 of the first drive rod 41 or the front end portion 423 of the second drive rod 42 can be rotated a longer rotation distance through the "lever" to push the receiving portion 3 to move a longer moving distance. That is, the shrinking distance of the memory wire SA1 or the memory wire SA2 can be enlarged based on the proportional relationship between the length of the active force arm and the slave force arm. Thus, the lens holding portion 3 can obtain a longer moving distance, that is, long-stroke autofocus can be achieved with high precision.

[0101] In addition, when the memory wire SA1 contracts, the receiving portion 3 is pushed to move in a direction away from the bottom surface 13, and when the memory wire SA2 contracts, the receiving portion 3 is pushed to move in a direction close to the bottom surface 13. Therefore, the lens holding portion 3 can be moved in both directions along the optical axis direction L, increasing the stroke length of the lens holding portion 3. Therefore, long-stroke autofocus can be further realized with high precision.

[0102] (Power supply organization 8)

[0103] Reference Figure 8 The power supply mechanism 8 will be described. Figure 8 FIG. 1 is a perspective view of the power supply mechanism 8 of the lens driving device 100. Figure 8 In the figure, part of the illustration is omitted for convenience of explanation, and only the shown part is explained.

[0104] like Figure 8 As shown, the power supply mechanism 8 includes leaf springs 81 , 82 and a metal circuit 83 .

[0105] The leaf springs 81 and 82 are respectively fixed to the base 1. One end of the leaf spring 81 is mechanically and electrically connected to the metal component 43 in the first driving rod 41, and the other end of the leaf spring 81 is mechanically and electrically connected to the metal circuit 83. Similarly, one end of the leaf spring 82 is mechanically and electrically connected to the metal component 44 in the second driving rod 42, and the other end of the leaf spring 82 is mechanically and electrically connected to the metal circuit 83.

[0106] Furthermore, the first driving metal clip 911 and the second driving metal clip 921 are mechanically and electrically connected to the metal components 43 and 44 , respectively, and the first fixing metal clip 912 and the second fixing metal clip 922 are mechanically and electrically connected to the metal circuit 83 , respectively.

[0107] Thus, when power is supplied to the metal circuit 83, current is supplied to the fixed end SA12 of the memory metal wire SA1 and the fixed end SA22 of the memory metal wire SA2 respectively via the metal circuit 83, the first fixed metal clip 912, and the second fixed metal clip 922. Furthermore, when power is supplied to the metal circuit 83, current is supplied to the driving end SA11 of the memory metal wire SA1 and the driving end SA21 of the memory metal wire SA2 respectively via the metal circuit 83, the leaf springs 81, 82, the metal parts 43, 44, the first driving metal clip 911, and the second driving metal clip 922.

[0108] Thus, the power supply mechanism including the leaf springs 81 and 82 and the metal circuit 83 can supply power to both ends of the memory wire SA1 and the memory wire SA2 to cause them to contract.

[0109] (Guiding mechanism 7)

[0110] Reference Fig. 9 , 10 The guide mechanism 7 will be described. Fig. 9 This is a front view of the lens driving device 100 with the housing 2 removed. Fig.10 is along Fig. 9 A cross-sectional top view of the lens driving device 100 taken along line AA' in FIG. Fig. 9 , 10 In order to facilitate the description of the guide mechanism 7, part of the illustration is omitted, and only the shown part is described.

[0111] like Fig.10 As shown, the guide mechanism 7 includes a pair of guide shafts 71 , 72 , a guide magnet 73 , and a guide plate 74 .

[0112] The pair of guide shafts 71 and 72 are provided on the chassis 1 perpendicularly to the bottom surface 13. The pair of guide shafts 71 and 72 are located between the receiving portion 31 and a guide magnet 73 described later in a plan view and penetrate the lens driving portion 3 along the optical axis direction L.

[0113] The guide magnet 73 is provided on the side of the base 1 opposite to the receiving portion 31. The guide magnet 73 is provided, for example, perpendicularly to the bottom surface 13. In addition, a guide plate 74 is provided on the side of the lens holding portion 3 opposite to the receiving portion 31, and is opposed to the guide magnet 73. The guide plate 74 is made of, for example, a magnetic metal material. The lens holding portion 3 is closely attached to the guide shafts 71 and 72 by the attraction between the guide magnet 73 and the guide plate 74.

[0114] Thus, when the lens holding portion 3 is moved in the optical axis direction L, the movement of the lens holding portion 3 can be guided, and thus long-stroke autofocus can be realized with further high accuracy.

[0115] In addition, in this embodiment, the lens driving device 100 may also have a Hall element H not shown in the figure. In the process of moving the lens holding part 3 along the optical axis direction L, the Hall element H detects the position of the lens holding part 3 along the optical axis direction by detecting the relative position of the attraction magnet 32 ​​in the receiving part 31 of the lens holding part 3.

[0116] Thus, the moving position of the lens holding portion 3 can be continuously detected during the process of moving the lens holding portion 3 along the optical axis direction L, thereby further realizing long-stroke autofocus with high accuracy. At the same time, the attraction magnet 32 ​​has the functions of maintaining contact and detecting the position of the lens holding portion 3. Therefore, the number of components can be reduced, and the structure of the lens driving device 100 can be simplified.

[0117] In the present embodiment, two drive rods 4 and two memory wires SA are provided, but the number of drive rods 4 and memory wires SA may not be two, as long as the lens holder 3 can be moved in both directions along the optical axis direction L.

[0118] In addition, in the present embodiment, the driving rod 4 is formed as a rod-shaped component extending from the root to the front end. However, the driving rod 4 may also be a component of other shapes, as long as it can push the receiving portion 31 to move by the contraction of the memory metal wire SA. In addition, the shape of the driving rod 4 can utilize the principle of a lever, and its active force arm is larger than the passive force arm, so that the contraction distance of the memory metal wire SA can be magnified so that the lens driving unit 3 can obtain a larger moving distance.

[0119] In addition, in the present embodiment, metal parts 43 and 44 are provided in the driving rod 4, and an attracting magnet 32 ​​is provided in the receiving portion 31, and the first driving rod 41 and the second driving rod 42 are always kept in contact with the receiving portion 31 by the attraction between the metal parts 43 and 44 and the attracting magnet 32. However, other methods may be used to keep the first driving rod 41 and the second driving rod 42 in contact with the receiving portion 31, as long as the problem of affecting the driving accuracy such as the idle stroke is not generated during the movement of the lens driving unit 3.

[0120] Through the lens driving device 100 of the present invention, the lens holding part 3 can be moved in both directions, and the moving distance of the lens holding part 3 is not limited to the contraction length of the memory metal wire SA. The stroke length of the lens holding part 3 can be increased, and long-stroke automatic focusing can be achieved with high precision.

[0121] Furthermore, according to the lens driving device 100 of the present invention, the number of components in the lens driving device 100 can be reduced, thereby achieving simplification and compactness of the structure.

[0122] (Variation Example)

[0123] Below, refer to Figures 11 to 15 A lens driving device 200 according to a modified example will be described. Fig.11 It is an exploded perspective view of a lens driving device 200 according to a modified example. Fig.12 It is a front view of the drive rod 24 and the memory wire SA in the assembled state of the lens drive device 200 according to the modification. Fig.13 It is an exploded perspective view of a driving rod 24 according to a modified example. Fig.14 This is a front view of the lens holding portion 203 according to the modification example moving in one direction. Fig.15 Hereinafter, only the differences between the lens driving device 200 of the modified example and the lens driving device 100 of the first embodiment will be described, and the same parts as those of the lens driving device 100 are given the same reference numerals and their descriptions are omitted.

[0124] (Driving rod 24 and receiving portion 231)

[0125] like Fig.11 , 10 As shown, in the lens driving device 200 of the modified example, there is only one driving rod 24. The driving rod 24 is formed to extend from a root portion 245 to a front end portion 243, and is branched into a first front end portion 241 and a second front end portion 242 along the optical axis direction L at the front end portion 243. An accommodation portion I is formed between the first front end portion 241 and the second front end portion 242 branched along the optical axis direction L. In the assembled state, the receiving portion 231 protrudes toward the driving rod 24 and is located in the accommodation portion I.

[0126] Similar to the lens driving device 100 of the first embodiment, in the lens driving device 200 of the modification, an attraction magnet 232 is provided in the receiving portion 231 , and a metal member 249 is provided in the driving rod 24 by, for example, insert molding.

[0127] (Metal Parts 249)

[0128] Reference Fig.13 The metal component 249 is described. Fig.13 As shown, the metal component 249 of the lens driving device 200 of the modified example is different from the metal components 43 and 44 of the first embodiment in that the metal component 249 extends from a position corresponding to the root 245 of the driving rod 24 to a position corresponding to the front end 243, and further extends to a position corresponding to the first front end 241, so that the metal component 249 is formed in a shape extending from the root 245 to the first front end 241 of the driving rod 24. Therefore, when the metal component 249 is embedded in the driving rod 24 by insert molding, the metal component 249 is embedded only in the first front end 241.

[0129] (Receiving section 231)

[0130] like Fig.12 As shown, in the lens driving device 200 of the modified example, for example, the upper surface of the receiving portion 231 protrudes upward (in the Z1 direction) and is formed into an arc surface. The upper surface of the receiving portion 231 contacts the first front end portion 241. And, by the attraction between the attraction magnet 232 in the receiving portion 231 and the metal component 249 in the driving rod, the receiving portion 231 is held in contact with the first front end portion 241 via the upper surface.

[0131] Thus, in the process of driving the lens holding portion 203 to move, the driving rod 24 always keeps in contact with the receiving portion 231. Therefore, there will be no problem of idle stroke or the like that affects the driving accuracy. Thus, long-stroke autofocus can be achieved with high accuracy.

[0132] In addition, in the modified example, the drive rod 24 is formed to branch into a first front end portion 241 and a second front end portion 242 at the front end portion 243, and an accommodating portion I for accommodating the receiving portion 231 is formed between the first front end portion 241 and the second front end portion 242.

[0133] For example, the front end portion 243 of the driving rod 24 may be formed into a shape having a through hole, and the receiving portion 231 may protrude from the lens holding portion 203 toward the driving rod 24, and further pass through the through hole of the front end portion 243 of the driving rod 24 to abut against the front end portion 243. Thus, when the driving rod 24 rotates, the receiving portion 231 moves along the optical axis direction L via the through hole.

[0134] Alternatively, the front end portion 243 of the driving rod 24 may be formed into a shape having a recessed portion, and the receiving portion 231 may protrude from the lens holding portion 203 into the recessed portion and abut against the front end portion 243 of the driving rod 24 in the recessed portion. Thus, when the driving rod 24 rotates, the receiving portion 231 may be moved in the optical axis direction L via the recessed portion.

[0135] That is, the shape of the front end portion 243 of the driving rod 24 is not limited, and the front end portion 243 of the driving rod 24 can be any shape as long as it can accommodate the receiving portion 231, abut against the receiving portion 231, and enable the receiving portion 231 to move along the optical axis direction L.

[0136] (Memory Metal Wire SA)

[0137] like Fig.12 As shown, in this modification, the rotation axis 244 of the driving rod 24 can be set on either the first side wall 11 or the second side wall 12. Here, the driving rod 24 can rotate around the rotation axis 244 along the optical axis direction L.

[0138] In addition, the memory metal wire SA includes a memory metal wire SA3 and a memory metal wire SA4. The memory metal wire SA3 includes one end as a driving end SA31 and the other end as a fixed end SA32. The memory metal wire SA4 includes one end as a driving end SA41 and the other end as a fixed end SA42.

[0139] The fixed end SA32 of the memory metal wire SA3 and the fixed end SA42 of the memory metal wire SA4 are respectively disposed on the other side of the first side wall 11 and the second side wall 12, that is, the side opposite to the rotating shaft 244 on which the driving rod 24 is disposed. In this modified example, the fixed end SA32 of the memory metal wire SA3 and the fixed end SA42 of the memory metal wire SA4 are respectively disposed on the second side wall 12 for explanation.

[0140] Specifically, a first fixing metal clip 293 and a second fixing metal clip 294 are disposed on the second side wall 12 , and the fixing end SA32 of the memory metal wire SA3 and the fixing end SA42 of the memory metal wire SA4 are clamped by the first fixing metal clip 293 and the second fixing metal clip 294 , respectively.

[0141] The driving end SA31 of the memory wire SA3 and the driving end SA41 of the memory wire SA4 are respectively provided at portions on both sides of the rotation shaft 244 of the driving lever 24 in the optical axis direction L.

[0142] Specifically, for example, in this modified example, the driving end SA31 of the memory metal wire SA3 is disposed on the side of the rotating shaft 244 close to the bottom surface 13, and the driving end SA41 of the memory metal wire SA4 is disposed on the side of the rotating shaft 244 away from the bottom surface 13. In addition, a first driving metal clip 291 is disposed on the side of the rotating shaft 244 close to the bottom surface 13, and a second driving metal clip 292 is disposed on the side of the rotating shaft 244 away from the bottom surface 13. The driving end SA31 of the memory metal wire SA3 and the driving end SA41 of the memory metal wire SA4 are clamped by the first driving metal clip 291 and the second driving metal clip 292, respectively.

[0143] That is, the memory metal wire SA3 and the memory metal wire SA4 are arranged to cross each other.

[0144] Therefore, in the lens driving device 200 of this modification, even if two memory wires SA are arranged, the space required for installing the memory wires SA3 and SA4 can be reduced, and the compactness of the structure of the lens driving device 200 can be further improved.

[0145] (Movement of Lens Holding Unit 203)

[0146] Below, use Fig.14 , 15 The movement of the lens holding unit 203 will be described. Fig.14 This is a front view of the lens holding portion 203 according to the modification example moving in one direction. Fig.15 FIG. 2 is a front view of the lens holding portion 203 of the modified example moved in another direction. Fig.14 , 15 In the figure, part of the illustration is omitted for convenience of explanation, and only the shown part is explained.

[0147] The memory metal wire SA3 and the memory metal wire SA4 are energized to contract.

[0148] like Fig.14As shown, when the memory metal wire SA3 is energized, the memory metal wire SA3 contracts. Since the fixed end SA32 of the memory metal wire SA3 is fixed to the second side wall 12 via the first fixed metal clip 293, the driving end SA31 contracts toward the fixed end SA32 (as shown in the direction S1 in the figure), and the memory metal wire SA3 pulls the driving rod 24 around the rotating shaft 244 to rotate in the direction (Z1 direction) away from the bottom surface 13 via the first driving metal clip 291 provided on the driving rod 24 (as shown in the direction S2 in the figure). At this time, through the attraction between the metal component 249 and the attracting magnet 232, the first front end 241 of the driving rod 24 pulls the receiving portion 231 to move the lens holding portion 203 in the direction (Z1 direction) away from the bottom surface 13 (as shown in the direction S3 in the figure).

[0149] like Fig.15 As shown, when the memory metal wire SA4 is energized, the memory metal wire SA4 contracts. Since the fixed end SA42 of the memory metal wire SA4 is fixed to the second side wall 12 via the second fixed metal clip 294, the driving end SA41 contracts toward the fixed end SA42 (as shown in the direction S4 in the figure), and the memory metal wire SA4 pulls the driving rod 24 around the rotating shaft 244 to rotate in the direction (Z2 direction) close to the bottom surface 13 via the second driving metal clip 292 provided on the driving rod 24 (as shown in the direction S5 in the figure). At this time, the first front end 241 of the driving rod 24 is kept in contact with the receiving portion 231, and the first front end 241 pushes the receiving portion 231 to move the lens holding portion 203 in the direction (Z2 direction) close to the bottom surface 13 (as shown in the direction S6 in the figure).

[0150] Similar to the first embodiment, in the driving rod 24, a main force arm is formed between the position of the first driving metal clamp 291 and the second driving metal clamp 292 and the rotating shaft 244, and a slave force arm is formed between the position where the first front end portion 241 contacts the receiving portion 31 and the rotating shaft 244, and the length of the main force arm is much smaller than the length of the slave force arm.

[0151] Thus, according to the lens driving device 200 of this modification, similarly to the first embodiment, the contraction distance of the memory wire SA3 or the memory wire SA4 can be enlarged based on the proportional relationship between the lengths of the active force arm and the passive force arm via the "lever". Thus, the lens holding portion 203 can obtain a longer moving distance, that is, long-stroke autofocus can be achieved with high precision.

[0152] In addition, according to the lens driving device 200 of this modification, when the memory wires SA3 and SA4 are contracted, the lens holding part 203 can be moved in both directions along the optical axis direction L, thereby increasing the stroke length of the lens holding part 203. Therefore, long-stroke autofocus can be realized with higher accuracy.

[0153] Furthermore, according to the lens driving device 200 of this modified example, the bidirectional movement of the lens holding portion 203 is realized by only one driving rod 24, and long-stroke autofocus can be realized with high precision, and at the same time, the number of components in the lens driving device 200 can be reduced, and its structure can be simplified and compacted. Furthermore, the contact between the driving rod 24 and the receiving portion 231 can be more reliably maintained.

[0154] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Various modifications and substitutions can be applied to the above embodiments without departing from the scope of the present invention. In addition, the various features described with reference to the above embodiments can be appropriately combined as long as there is no technical contradiction.

Claims

1. A lens driving device, comprising: A base, comprising a bottom surface, and a first side wall and a second side wall which are perpendicular to the bottom surface and are located in the same plane with each other; A housing, which is covered on the base and forms a receiving space with the base; and A lens holding portion is disposed in the receiving space. The lens driving device is characterized in that it has: a drive rod capable of rotating around a rotation axis within a specified angle range, wherein the axis of the rotation axis is perpendicular to the optical axis direction, and the drive rod has a root portion close to the rotation axis and a front end portion away from the rotation axis; and A memory metal wire having one end as a driving end and the other end as a fixed end, wherein the driving end is arranged at the root of the driving rod, A receiving portion abutting against the front end portion of the driving rod is provided on one side surface of the lens holding portion, and in an assembled state, the receiving portion is exposed from a notch between the first side wall and the second side wall; When the memory wire is energized, the memory wire contracts, causing the drive rod to rotate about the rotation axis, and the front end of the drive rod pushes the receiving portion to move the lens holding portion along the optical axis direction.

2. The lens driving device according to claim 1, characterized in that: An attracting magnet is provided on the receiving portion. A metal component is arranged inside the driving rod. The front end portion of the driving rod is held in contact with the receiving portion by the attraction force between the attraction magnet and the metal member.

3. The lens driving device according to claim 2, characterized in that: The memory metal wires are two memory metal wires including a first memory metal wire and a second memory metal wire. The first memory metal wire rotates the front end portion of the driving rod in such a manner that the receiving portion moves in a direction away from the bottom surface along the optical axis direction. The second memory wire rotates the front end portion of the driving lever so that the receiving portion moves in a direction approaching the bottom surface along the optical axis direction.

4. The lens driving device according to claim 3, characterized in that: The driving rods are two driving rods including a first driving rod and a second driving rod. The rotation axis of the first driving rod is arranged on the second side wall, The rotation axis of the second driving rod is arranged on the first side wall, The receiving portion is sandwiched between the first driving rod and the second driving rod.

5. The lens driving device according to claim 4, characterized in that: The fixed end of the first memory metal wire is arranged at a portion of the first side wall away from the bottom surface. The driving end of the first memory metal wire is arranged at a portion of the first driving rod close to the bottom surface. The fixed end of the second memory metal wire is arranged at a portion of the second side wall close to the bottom surface. The driving end of the second memory metal wire is arranged at a portion of the second driving rod away from the bottom surface.

6. The lens driving device according to claim 5, characterized in that: The first memory metal line is arranged in parallel with the second memory metal line.

7. The lens driving device according to claim 3, characterized in that: The driving rod is a driving rod, The front end portion of the driving rod has a receiving portion, and the receiving portion is located in the receiving portion.

8. The lens driving device according to claim 7, characterized in that: The rotation axis of the driving rod is disposed on one of the first side wall and the second side wall. The fixed end of the first memory metal wire and the fixed end of the second memory metal wire are respectively disposed on the other of the first side wall and the second side wall. The driving end of the first memory metal wire and the driving end of the second memory metal wire are respectively arranged on both sides of the rotating shaft of the driving rod. The driving end of the first memory metal wire is arranged on a side of the rotating shaft close to the bottom surface. The driving end of the second memory metal wire is arranged on a side of the rotating shaft away from the bottom surface.

9. The lens driving device according to claim 8, characterized in that: The first memory metal wire and the second memory metal wire are arranged to cross each other.

10. The lens driving device according to any one of claims 2 to 9, characterized in that: It also has a leaf spring, which supplies power to the metal component and is fixed to the base. The base has a metal circuit, One end of the leaf spring is connected to the metal component, and the other end is connected to the metal circuit. Both ends of the memory metal wire are clamped by metal clips respectively, the metal clip at the driving end is connected to the metal component, and the metal clip at the fixed end is connected to the metal circuit.

11. The lens driving device according to any one of claims 2 to 9, characterized in that: The metal component is made of magnetic metal material.

12. The lens driving device according to any one of claims 2 to 9, characterized in that: The driving rod is obtained by insert molding the metal component.

13. The lens driving device according to any one of claims 2 to 9, characterized in that: A Hall element is further provided for detecting the position of the lens holding portion along the optical axis direction by detecting the relative position of the attraction magnet.

14. The lens driving device according to any one of claims 2 to 9, characterized in that: The base is provided with a pair of guide shafts perpendicular to the bottom surface, and the pair of guide shafts are located on one side of the receiving portion close to the optical axis. A guide magnet is provided on a side of the base opposite to the receiving portion. The lens holding portion is provided with a guide plate facing the guide magnet. The lens holding portion and the pair of guide shafts are brought into close contact with each other by the attraction force between the guide magnet and the guide plate.

Images