Lens drive device

Abstract

The present invention discloses a lens driving device, comprising a housing, a frame, a carrier, a base, an upper spring leaf, and a lower spring leaf, wherein the frame is provided with a magnet group, the carrier is provided with a first coil, and the base is provided with a second coil, the first coil cooperates with the magnet group to drive the carrier to move along the optical axis, the second coil cooperates with the magnet group to drive the frame and the carrier to move on a plane perpendicular to the optical axis, and an elastic member is provided between the frame and the base, the elastic member comprises a plurality of mutually independent parts and is arranged around the frame, each independent part of the elastic member comprises a base connecting portion, a frame connecting portion, and an elastic portion connecting the base connecting portion and the frame connecting portion, the base connecting portion is connected to the base, and the frame connecting portion is connected to the bottom end of the frame, thereby movably connecting the frame and the base through the elastic member. The present invention can solve the problem that the carrier of a traditional optical element driving device has a weak reset ability after displacement, and improve the optical anti-shake performance of the optical element driving device.

Description

Technical Field

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

[0002] With the widespread popularity of smartphones, the application scope of mobile phone cameras is becoming increasingly wider. However, most of the sensors in mobile phone cameras are currently installed in the module outside the motor. The side FPC uses a flexible circuit board, which causes problems such as warping, making sensor detection unstable. At the same time, the side FPC uses a flexible circuit board, and uneven installation will affect the actual movement range. The vertical moving part of the middle carrier transmits power from the bottom FPC to the upper spring leaf and then to the coil on the carrier through the suspension wire. When the motor is impacted or after a long period of operation, the suspension wire becomes less reliable and is prone to breakage and other problems, causing the entire motor to fail. In addition, the carrier is usually elastically connected to the frame and base through the upper and lower spring leaves. During the movement of the carrier, the upper and lower spring leaves provide insufficient restoring force, which can easily make the carrier's reset process less sensitive, affecting image quality. Summary of the Invention

[0003] The object of the present invention is to provide a lens driving device to solve the above-mentioned problems in the prior art.

[0004] In order to solve the above problems, according to one aspect of the present invention, a lens driving device is provided, which includes a housing, a frame, a carrier, a base, an upper spring and a lower spring, the frame is provided with a magnet group, the carrier is provided with a first coil that cooperates with the magnet group, the base is provided with a second coil that cooperates with the magnet group, the first coil cooperates with the magnet group to drive the carrier to move along the optical axis, and the second coil cooperates with the magnet group to drive the frame and the carrier to move in a plane perpendicular to the optical axis, and

[0005] An elastic member is arranged between the frame and the base, and the elastic member includes a plurality of independent parts and is arranged around the frame. Each of the independent parts of the elastic member includes a base connecting part, a frame connecting part, and an elastic part connecting the base connecting part and the frame connecting part. The base connecting part is connected to the base, and the frame connecting part is connected to the bottom end of the frame, so that the frame and the base are movably connected through the elastic member.

[0006] In one embodiment, the elastic portion includes a first hollow portion, a bent portion and a second hollow portion, the first hollow portion and the second hollow portion are respectively arranged on adjacent two sides of the frame, and the bent portion is arranged at the corner of the frame and connects the first hollow portion and the second hollow portion.

[0007] In one embodiment, the frame connecting portion is a frame connecting piece, and the base connecting portion is a base connecting piece. The frame connecting piece and the base connecting piece of the same elastic member are located on adjacent sides of the frame and are respectively arranged at the bottom of the frame and the bottom of the base.

[0008] In one embodiment, the frame is arranged above the base, and magnet grooves are provided on the inner sides of the four end corners of the frame for installing the magnet group, and elastic member limiting grooves are provided on the outer side wall of the frame for limiting the elastic member.

[0009] In one embodiment, a first avoidance groove is provided in the middle of the outer side wall of the frame for avoiding the base connecting piece of the elastic member.

[0010] In one embodiment, a second avoidance groove is provided at the bottom end of the end corner of the frame for avoiding the bent portion of the elastic member.

[0011] In one embodiment, a second mounting protrusion is provided on the side of the frame, and the second mounting protrusion is connected to the elastic member so that the elastic member and the frame are in an overhead state; preferably, the bottom end of the second mounting protrusion is connected to the elastic member.

[0012] In one embodiment, a limiting groove is provided on the inner side of the frame, and a limiting protrusion is provided on the outer side of the carrier, and the limiting groove cooperates with the limiting protrusion to limit the longitudinal movement range of the carrier.

[0013] In one embodiment, the four end corners of the frame top are provided with frame top protrusions, and the top of the carrier is provided with a carrier top protrusion. The frame top protrusions and the carrier top protrusions provide space for the installation of the upper spring leaf, preventing the upper spring leaf from directly contacting the top of the shell.

[0014] In one embodiment, a first coil is provided on the outside of the carrier, and when the first coil is energized, it cooperates with the magnet to drive the carrier to move along the optical axis, wherein the upper end of the carrier and the upper end of the frame are both provided with upper spring connecting columns to connect with the upper spring, and the bottom end of the frame is provided with a lower spring connecting column and the bottom end of the carrier is provided with a lower spring connecting convex ring, which is connected to the lower spring through the lower spring connecting convex ring and the lower spring connecting column.

[0015] In one embodiment, the base is provided with a first mounting protrusion connected to the elastic member, a first power-on point is provided on the first mounting protrusion, the first power-on point is connected to the internal circuit of the base, a second power-on point is provided at the bottom end of the frame, the first power-on point and the second power-on point are connected through the elastic member, a frame built-in circuit is provided inside the frame, a third power-on point is provided at the top end of the frame, the second power-on point and the third power-on point are connected through the frame built-in circuit, and a carrier built-in circuit is provided inside the carrier, the third power-on point is connected to the built-in circuit of the carrier through the upper spring sheet, and the carrier built-in circuit is connected to the first coil.

[0016] In one embodiment, the lens driving device includes two of the first power-on points, two of the second power-on points, two of the third power-on points and two of the upper springs. When performing a power supply operation, one group of the first power-on points, the second power-on points, the third power-on points and the upper springs are used for current input, and another group of the first power-on points, the second power-on points, the third power-on points and the upper springs are used for current output, thereby forming a closed circuit.

[0017] In one embodiment, the base is provided with a coil groove and a damping rubber groove. The coil groove is used to place the second coil, which is connected to the internal circuit of the base. The damping rubber groove is used to place the damping block. The internal circuit of the frame is composed of a metal sheet, and the metal sheet extends from the bottom end of the frame to form a damping rod. The damping rod is inserted into the damping block. The elastic action of the damping block assists the frame to return to its original position after moving in the X-axis and Y-axis, and at the same time it can play an insulating effect.

[0018] In one embodiment, two position sensors are provided at the bottom of the base. The two position sensors are powered by internal circuits of the base and respectively cooperate with two different magnets to monitor the displacement of the lens in the X-axis direction and the Y-axis direction.

[0019] The lens driving device of the present invention can solve the problem of weak reset capability of a carrier of a conventional optical element driving device after displacement, thereby improving the optical anti-shake performance of the optical element driving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective exploded view of a lens driving device according to an embodiment of the present invention.

[0021] Figure 2 4 is a perspective view of an elastic member according to an embodiment of the present invention.

[0022] Figure 3 FIG. 1 is a perspective view of a frame with elastic members installed according to an embodiment of the present invention.

[0023] Figure 4-51 is a perspective view of a frame according to an embodiment of the present invention from different perspectives.

[0024] Figure 6-7 These are three-dimensional views of a carrier according to an embodiment of the present invention from different perspectives.

[0025] Figure 8 It is a three-dimensional diagram of a base according to one embodiment of the present invention.

[0026] Figure 9 It is a three-dimensional view of a base with an elastic member installed according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0028] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0029] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0030] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0031] The present application generally relates to a lens driving device, which can be used in terminal products such as mobile phones and tablet computers to cooperate with lenses to achieve functions such as taking pictures and recording videos.

[0032] Figure 1 FIG. 1 is an exploded perspective view of a lens driving device 100 according to an embodiment of the present invention. Figure 2 FIG. 7 is a perspective view of an elastic member 70 according to an embodiment of the present invention. Figure 1-2 As shown, the lens driving device 100 includes a housing 10, a frame 20, a carrier 30, a base 40, an upper spring 50 and a lower spring 60. The frame 20 is provided with a magnet group 21, which is composed of a plurality of magnets. The carrier 30 is used to mount the lens 80 and is provided with a first coil 31 (see FIG. Figure 6 ), the base 40 is provided with a second coil 41 that cooperates with the magnet group 21 (refer to Figure 9 ), the first coil 31 cooperates with the magnet group 21 to drive the carrier 30 to move along the optical axis to realize the optical zoom function, and the second coil 41 cooperates with the magnet group 21 to drive the frame 20 and the carrier 30 to move in a plane perpendicular to the optical axis to realize the optical image stabilization function. An elastic member 70 is provided between the frame 20 and the base 40. The elastic member 70 is composed of a plurality of independent parts. These independent parts are preferably arranged to have the same structure and shape and are arranged around the frame 20. Each part of the elastic member 70 includes a base connection part 71, a frame connection part 72 and an elastic part 73 connecting the base connection part and the frame connection part. The base connection part 71 is connected to the base 40, and the frame connection part 72 is connected to the frame 20, so that the frame 20 and the base 40 are movably connected through the elastic member 70. The ingenious design of the elastic member 70 solves the problem of the carrier 30 having a weak reset ability after displacement, enhances the reset ability of the carrier 30 after deformation, and improves the optical image stabilization performance of the optical element driving device.

[0033] Reference Figure 2 In one embodiment, the independent portions of the elastic member 70 are identical, so one portion is used as an example for description. Optionally, the elastic portion 73 includes a first hollow portion 731, a bent portion 733, and a second hollow portion 732. The first hollow portion 731 and the second hollow portion 732 are respectively arranged on adjacent sides of the frame 20, and the bent portion 733 is arranged at a corner of the frame and connects the first hollow portion 731 and the second hollow portion 732. The first hollow portion 731, the bent portion 733, and the second hollow portion 732 increase the elastic deformation of the elastic member, expand the range of motion of the frame relative to the base, and further enhance the optical image stabilization effect.

[0034] Continue to refer to Figure 2 In one embodiment, the frame connecting portion 72 is a frame connecting piece, and the base connecting portion 71 is a base connecting piece. The frame connecting piece 72 and the base connecting piece 71 of the same part of the elastic member 70 are located on adjacent sides of the frame 20 and are respectively arranged at the bottom of the frame 20 and the bottom of the base 40. In other words, the frame connecting piece 72 and the base connecting piece 71 are respectively formed by extending inward from the bottom of the elastic portion 73. Optionally, in combination Figure 8The frame connecting portion 72 is provided with a frame connecting hole 721, the frame connecting hole 721 is connected to the first elastic piece connecting column 722 on the frame 20, and the base connecting portion 71 is provided with a base connecting hole 711, the base connecting hole 711 is connected to the second elastic piece connecting column 712 on the base 40.

[0035] Figure 3 is a perspective view of the frame 20 with the elastic member 70 installed. Figure 4-5 are three-dimensional images of the frame 40 from different perspectives, such as Figure 3-5 As shown, in one embodiment, the frame 20 is disposed above the base 40, and magnet grooves 22 are provided on the inner sides of the four end corners of the frame 20 for mounting the magnet group 21, and elastic member limiting grooves 23 are provided on the outer side wall of the frame to limit the elastic member 70. Optionally, the elastic member limiting grooves 23 can be provided as a semi-open structure, that is, the elastic member limiting grooves 23 can be formed by providing the side wall of the frame 20 with an inwardly recessed step. When the elastic member 70 is installed on the step, the outer surface is substantially flush with the outer surface of the frame 20, and the lower surface is located above the base 40.

[0036] Continue to refer to Figure 3-5 In one embodiment, a first avoidance groove 24 is provided in the middle of the outer wall of the frame 20 for avoiding the base connecting piece 71 of the elastic member 70 . The base connecting piece 71 of the elastic member 70 is installed in the first avoidance groove 24 .

[0037] Reference Figure 3-5 In one embodiment, a second avoidance groove 25 is provided at the bottom end of the end corner of the frame, and the bent portion 733 of the elastic member 70 is avoided by the second avoidance groove 25. Optionally, the second avoidance groove 25 is formed inward from the end corner of the frame 20, that is, the second avoidance groove 25 is formed by a notch at the lower position of the end corner of the frame 20, and the bent portion 733 of the elastic member 70 is arranged in the notch 25.

[0038] In one embodiment, a second mounting protrusion 26 is provided on the side of the frame 20 , and the second mounting protrusion 26 is connected to the elastic member 70 so that the elastic member 70 and the frame 20 are in an overhead state. Preferably, the bottom end of the second mounting protrusion 26 is connected to the elastic member 70 .

[0039] Figure 6-7 They are three-dimensional views of the carrier 30 of an embodiment from different perspectives, referring to Figure 3-7In one embodiment, a limiting groove 27 is provided on the inner side of the frame 20, and a limiting protrusion 32 is provided on the outer side of the carrier 30. The limiting groove 27 and the limiting protrusion 32 cooperate to limit the longitudinal movement range of the carrier 30, that is, the range of movement along the optical axis. Optionally, the limiting groove 27 is open at the top and closed at the bottom. When the carrier 30 moves downward, that is, toward the base 40, within a certain range, the limiting protrusion 32 contacts the bottom of the limiting groove 27, preventing the carrier 30 from moving further downward.

[0040] Continue to refer to Figure 3-7 In one embodiment, the four end corners of the top of the frame 20 are provided with frame top protrusions 28, and the top of the carrier 30 is provided with a carrier top protrusion 33. The frame top protrusion 28 and the carrier top protrusion 33 provide space for the installation of the upper spring 50 to prevent the upper spring 50 from directly touching the top of the shell 10. That is, when the upper spring 50 is installed on the top of the frame 20 and the carrier 30, the carrier top protrusion 33 and the frame top protrusion 28 protrude from the upper surface of the upper spring 50, so that when the carrier and the frame move, the carrier top protrusion 33 and the frame top protrusion 28 are in contact with the top of the shell 10, avoiding the upper spring 50 from directly contacting the top of the shell 10 and preventing damage to the upper spring 50.

[0041] Reference Figure 3-7 In one embodiment, a first coil 31 is provided on the outside of the carrier 30. When the first coil 31 is energized, it cooperates with the magnet group 21 to drive the carrier 30 to move along the optical axis. The upper end of the carrier 30 and the upper end of the frame 20 are both provided with an upper spring connecting column 51 to connect with the upper spring 50, and the bottom end of the frame 20 is provided with a lower spring connecting column 61 and the bottom end of the carrier 30 is provided with a lower spring connecting protruding ring 34. The frame 20 and the carrier 30 are respectively connected to the lower spring 60 through the lower spring connecting column 61 and the lower spring connecting protruding ring 34.

[0042] Figure 8 is a perspective view of a base 40 according to an embodiment of the present invention. Figure 9 FIG. 1 is a perspective view of a base with an elastic member installed according to an embodiment of the present invention. Figure 8-9 As shown, in one embodiment, the base 40 is provided with a first mounting protrusion 42 connected to the elastic member 70, and the first mounting protrusion 42 is provided with a first power point 421, which is connected to the base internal circuit (not shown) of the base 40. Figure 5A second power-on point 291 is provided at the bottom end of the frame 20, the first power-on point 421 is connected to the second power-on point 291 through the elastic member 70 circuit, a frame built-in circuit (not shown) is provided inside the frame 20, a third power-on point 292 is provided at the top end of the frame 20, the second power-on point 291 and the third power-on point 292 are connected through the frame built-in circuit, and a carrier built-in circuit (not shown) is provided inside the carrier, the third power-on point 292 is connected to the carrier built-in circuit through the upper spring sheet 50, and the carrier built-in circuit is connected to the first coil 31.

[0043] Optionally, the lens driving device 100 includes two first power-on points 421, two second power-on points 291, two third power-on points 293 and two upper springs 50. When performing a power supply operation, one group of the first power-on points 421, the second power-on points 291, the third power-on points 292 and an upper spring 50 is used for current input, and the other group of the first power-on points 421, the second power-on points 291, the third power-on points 292 and an upper spring 50 is used for current output, thereby forming a closed circuit.

[0044] Reference Figure 8-9 Combined with Figure 3 In one embodiment, a coil groove 43 and a damping rubber groove 44 are provided on the base 40. The coil groove 43 is used to place the second coil 41, and the second coil 41 is connected to the internal circuit of the base 40. The damping rubber groove 44 is used to place the damping block 45. The internal circuit of the frame is composed of a metal sheet, and the metal sheet extends from the bottom end of the frame to form a damping rod 294. The damping rod 294 is inserted into the damping block 45. The elastic action of the damping block 45 assists the frame 20 to return to its original position after moving in a plane perpendicular to the optical axis, and can also play an insulating effect.

[0045] In one embodiment, two position sensors are provided at the bottom end of the base 40. The two position sensors are powered by the internal circuit of the base and respectively cooperate with two different magnets in the magnet group 21 to realize the position monitoring of the lens in two axial directions on the plane perpendicular to the optical axis, such as the X-axis direction and the Y-axis direction.

[0046] In summary, the optical element driving device of the present invention has broad commercial application scenarios and can be widely used in various electronic devices such as mobile phones and smart phones.

[0047] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A lens driving device, characterized in that: The lens driving device includes a housing, a frame, a carrier, a base, an upper spring and a lower spring, the frame is provided with a magnet group, the carrier is provided with a first coil that cooperates with the magnet group, the base is provided with a second coil that cooperates with the magnet group, the first coil cooperates with the magnet group to drive the carrier to move along the optical axis, and the second coil cooperates with the magnet group to drive the frame and the carrier to move in a plane perpendicular to the optical axis, and An elastic member is provided between the frame and the base, the elastic member including mutually independent parts and arranged around the frame, each of the independent parts of the elastic member including a base connecting portion, a frame connecting portion, and an elastic portion connecting the base connecting portion and the frame connecting portion, the base connecting portion being connected to the base, and the frame connecting portion being connected to the bottom end of the frame, so that the frame and the base are movably connected through the elastic member; The elastic portion includes a first hollow portion, a bent portion, and a second hollow portion, wherein the first hollow portion and the second hollow portion are respectively arranged on adjacent sides of the frame, and the bent portion is arranged at a corner of the frame and connects the first hollow portion and the second hollow portion; The base is provided with a first mounting protrusion connected to the elastic member, and a first power-on point is provided on the first mounting protrusion, and the first power-on point is connected to the internal circuit of the base. A second power-on point is provided at the bottom end of the frame, and the first power-on point and the second power-on point are connected through the elastic member. A frame built-in circuit is provided inside the frame, and a third power-on point is provided at the top end of the frame, and the second power-on point and the third power-on point are connected through the frame built-in circuit. A carrier built-in circuit is provided inside the carrier, and the third power-on point is connected to the built-in circuit of the carrier through the upper spring sheet, and the built-in circuit of the carrier is connected to the first coil.

2. The lens driving device according to claim 1, wherein: The frame connecting portion is a frame connecting piece, and the base connecting portion is a base connecting piece. The frame connecting piece and the base connecting piece of the same elastic member are located on adjacent sides of the frame and are respectively arranged at the bottom of the frame and the bottom of the base.

3. The lens driving device according to claim 1, wherein: The frame is arranged above the base, and magnet grooves are arranged on the inner sides of the four end corners of the frame for installing the magnet group, and elastic member limiting grooves are arranged on the outer side wall of the frame for limiting the elastic member.

4. The lens driving device according to claim 1, wherein: A first avoidance groove is provided in the middle of the outer side wall of the frame for avoiding the base connecting piece of the elastic member.

5. The lens driving device according to claim 1, wherein: A second avoidance groove is provided at the bottom end of the end corner of the frame for avoiding the bent portion of the elastic member.

6. The lens driving device according to claim 1, wherein: A second mounting protrusion is provided on the side surface of the frame, the second mounting protrusion is connected to the elastic member and makes the elastic member and the frame in an overhead state; the bottom end of the second mounting protrusion is connected to the elastic member.

7. The lens driving device according to claim 1, wherein: A limiting groove is provided on the inner side of the frame, and a limiting protrusion is provided on the outer side of the carrier. The limiting groove cooperates with the limiting protrusion to limit the longitudinal movement range of the carrier.

8. The lens driving device according to claim 1, wherein: The four corners of the top of the frame are provided with frame top protrusions, and the top of the carrier is provided with a carrier top protrusion. The frame top protrusions and the carrier top protrusions provide space for the installation of the upper spring to prevent the upper spring from directly contacting the top of the shell.

9. The lens driving device according to claim 1, wherein: A first coil is provided on the outside of the carrier, and when the first coil is energized, it cooperates with the magnet to drive the carrier to move along the optical axis. The upper end of the carrier and the upper end of the frame are both provided with upper spring connecting columns to connect with the upper spring, and the bottom end of the frame is provided with a lower spring connecting column and the bottom end of the carrier is provided with a lower spring connecting convex ring, which is connected to the lower spring through the lower spring connecting convex ring and the lower spring connecting column.

10. The lens driving device according to claim 1, wherein: The lens driving device includes two first power-on points, two second power-on points, two third power-on points and two upper springs. When performing power supply operation, one group of the first power-on points, the second power-on points, the third power-on points and the upper springs are used for current input, and the other group of the first power-on points, the second power-on points, the third power-on points and the upper springs are used for current output, thereby forming a closed circuit.

11. The lens driving device according to claim 1, wherein: The base is provided with a coil groove and a damping rubber groove. The coil groove is used to place the second coil, which is connected to the internal circuit of the base. The damping rubber groove is used to place the damping block. The internal circuit of the frame is composed of a metal sheet. The metal sheet extends from the bottom end of the frame to form a damping rod. The damping rod is inserted into the damping block. The elastic action of the damping block assists the frame to return to its original position after moving in the X-axis and Y-axis, and at the same time plays an insulating effect.

12. The lens driving device according to claim 1, wherein: Two position sensors are provided at the bottom of the base. The two position sensors are powered by internal circuits of the base and respectively cooperate with two different magnets to monitor the displacement of the lens in the X-axis direction and the Y-axis direction.

Images