Lens driving device

Abstract

A lens driving device (100), comprising a housing (1) having a through hole (2), a lens (2) arranged in the housing (1) and partially extending out of the housing (1), a carrier frame (3) carrying the lens (2), a support frame (4) arranged around the carrier frame (3), elastic elements (5) elastically connecting the carrier frame (3) to the support frame (4), a first driving assembly (6) arranged at a corner part (101) position of the lens driving device (100), and a second driving assembly (7) arranged at another corner part (101) position of the lens driving device (100). The lens (2) has an optical axis; the first driving assembly (6) drives the carrier frame (3) and the lens (2) to move in the direction of the optical axis; the second driving assembly (7) drives the support frame (4), the carrier frame (3) and the lens (2) to move in a direction perpendicular to the optical axis; the elastic elements (5) are made of a polymer material. By using the polymer elastic elements (5), the lens driving device (100) can provide the lens (2) with a greater motion stroke, and the reliability of the elastic elements (5) is higher.

Description

Lens driving device TECHNICAL FIELD

[0001] The present application relates to the technical field of lens, in particular to a lens driving device. BACKGROUND

[0002] Recently, in addition to portable cameras, portable terminals such as smart phones and tablet computers are also equipped with high-performance lens driving devices. The high-performance lens driving device equipped on the portable terminal generally has an auto focusing function (AF) and an optical image stabilization function (OIS). The optical image stabilization function (OIS) can reduce the shaking of the photo caused by external vibration or the hand tremor of the user. TECHNICAL PROBLEM

[0003] In the lens driving device of the related art, the spring in the structure related to the auto focusing function is generally a metal spring, which is mostly made of copper or stainless steel, and adopts a two-layer structure, each layer being provided with four springs. The spring with such a structure occupies a relatively large space of the lens driving device, and is prone to breakage in drop tests.

[0004] Therefore, it is necessary to provide a new lens driving device to solve the above technical problems. TECHNICAL SOLUTION

[0005] The present application aims to provide a lens driving device with stable structure and high reliability.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present application is as follows: a lens driving device, comprising a shell with a through hole, a lens arranged in the shell and partially extending beyond the shell, a carrier frame bearing the lens, a support frame arranged around the carrier frame, an elastic element elastically connecting the carrier frame to the support frame, a first driving assembly arranged at a corner position of the lens driving device, and a second driving assembly arranged at another corner position of the lens driving device, the lens having an optical axis, the first driving assembly driving the carrier frame and the lens to move along the direction of the optical axis, the second driving assembly driving the support frame, the carrier frame and the lens to move along the direction perpendicular to the optical axis, and the elastic element being made of a high polymer material.

[0007] Preferably, the elastic element is in a wave shape.

[0008] Preferably, the lens driving device further comprises a first metal piece fixing one end of the elastic element to the carrier frame and / or a second metal piece fixing the other end of the elastic element to the support frame.

[0009] Preferably, the elastic element is made of at least one of silicone, rubber, polyether ether ketone, and polyimide.

[0010] Preferably, the elastic element includes a first elastic element arranged on a side of the carrier frame close to the through hole and a second elastic element arranged on a side of the carrier frame away from the through hole, the first elastic element is in a ring structure, and / or the second elastic element is in a ring structure.

[0011] Preferably, the elastic element includes a first elastic element arranged on a side of the carrier frame close to the through hole and a second elastic element arranged on a side of the carrier frame away from the through hole, the first elastic element is in a ring structure, and / or the second elastic element is in a ring structure.

[0012] Preferably, the first driving assembly includes a magnetic frame fixed to the support frame and having a receiving space, a first magnetic steel assembly located in the receiving space, and a first coil arranged around the first magnetic steel assembly, the magnetic frame is provided with a notch, and the carrier frame includes an extension arm fixedly connected with the first coil through the notch.

[0013] Preferably, the second driving assembly includes a first group of magnetic steels fixed to the shell and arranged along one straight side constituting the corner, a first driving coil arranged at intervals on a side of the first group of magnetic steels close to the through hole, a second group of magnetic steels arranged along another straight side constituting the corner, and a second driving coil arranged at intervals on a side of the second group of magnetic steels close to the through hole, the first driving coil and the second driving coil being fixed to the support frame.

[0014] Preferably, the lens driving device further includes a first circuit board electrically connected with the first coil, one end of the first circuit board being fixed to the carrier frame, and the other end of the first circuit board being fixed to the support frame.

[0015] Preferably, the lens driving device further includes an elastic support member elastically supporting the support frame, the elastic support member including a first support portion fixed to the shell, a second support portion fixed to opposite sides of the support frame, and a connecting portion connecting the first support portion and the second support portion. Advantages

[0016] Compared with the related art, the lens driving device provided by the application comprises a shell with a through hole, a lens arranged in the shell and partially extending beyond the shell, a carrier frame bearing the lens, a support frame arranged around the carrier frame, an elastic element elastically connecting the carrier frame to the support frame, a first driving assembly arranged at a corner position of the lens driving device, and a second driving assembly arranged at another corner position of the lens driving device, the lens has an optical axis, the first driving assembly drives the carrier frame and the lens to move along the direction of the optical axis, the second driving assembly drives the support frame, the carrier frame and the lens to move along the direction perpendicular to the optical axis, and the elastic element is made of a high polymer material. The lens driving device of the application adopts a high polymer elastic element, which occupies a small space and can provide a larger movement stroke of the lens during automatic focusing of the lens, and the reliability of the elastic element is higher during drop resistance and fatigue resistance tests of the lens driving device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a schematic view of a perspective structure of the lens driving device of the application;

[0018] Fig. 2 is a partially exploded view of the lens driving device shown in Fig. 1;

[0019] Fig. 3 is a further partially exploded view of the lens driving device shown in Fig. 1;

[0020] Fig. 4 is an exploded view of the lens driving device shown in Fig. 1;

[0021] Fig. 5 is a sectional view of the lens driving device shown in Fig. 1 along line A-A;

[0022] Fig. 6 is a sectional view of the lens driving device shown in Fig. 1 along line B-B. Best Mode for Carrying Out the Invention

[0023] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0024] Referring to Figs. 1-6, the present application provides a lens driving device 100, which comprises a housing 1 with a through hole 10, a lens 2 arranged in the housing 1 and partially extending beyond the housing 1, a carrier frame 3 carrying the lens 2, a support frame 4 arranged around the carrier frame 3, an elastic element 5 elastically connecting the carrier frame 3 to the support frame 4, a first driving assembly 6 arranged at a corner 101 of the lens driving device 100 and a second driving assembly 7 arranged at another corner 101 of the lens driving device 100, a first circuit board 81, a second circuit board 82, an electrical connector 91 and an elastic support 92.

[0025] The housing 1 comprises a cover 11 and a bottom plate 12 surrounding the cover 11 to form a containing space, the through hole 10 is arranged on the cover 11, and the bottom plate 12 is also provided with a through hole.

[0026] The lens 2 has an optical axis O.

[0027] The carrier frame 3 is arranged around the lens 2 and carries the lens 2, the carrier frame 3 comprises a hollow annular main body 31 and an extension arm 32 extending outward from the main body 31, the extension arm 32 is arranged at the corner 101 of the lens driving device 100, and each of the two corners of a pair of diagonal lines of the lens driving device 100 is provided with a pair of extension arms 32.

[0028] The support frame 4 is a hollow annular structure, the lens driving device 100 further comprises a reinforcing ring 40 embedded in the inside of the support frame 4, the reinforcing ring 40 is made of metal material to improve the strength and stability of the support frame 4. The support frame 4 is provided with a carrying table 41 at the corner 101 corresponding to the arrangement of the extension arm 32, and the first driving assembly 6 is fixed on the carrying table 41.

[0029] The elastic element 5 is arranged between the carrier frame 3 and the support frame 4 to elastically support the carrier frame 3. The elastic element 5 is made of a high polymer material, specifically, the elastic element 5 is made of at least one of silica gel, rubber, polyether ether ketone, and polyimide. In the embodiment, the elastic element 5 is in a wave shape, and in other embodiments, the elastic element 5 can also be in other shapes with excellent elasticity, such as a sawtooth shape, etc. The lens driving device 100 further includes a first metal piece 51 fixing one end of the elastic element 5 to the carrier frame 3 and / or a second metal piece 52 fixing the other end of the elastic element 5 to the support frame 4. The first metal piece 51 and / or the second metal piece 52 are arranged at the edge position of the elastic element 5 so that the elastic element 5 is stably fixed to the carrier frame 3 and the support frame 4. Of course, the lens driving device 100 can not be provided with the first metal piece 51 and the second metal piece 52, so that the elastic element 5 can be directly fixed to the carrier frame 3 and the support frame 4, which can adopt gluing or other fixing methods.

[0030] The elastic element 5 includes a first elastic element 53 arranged on the side of the carrier frame 3 close to the through hole 10 and a second elastic element 54 arranged on the side of the carrier frame 3 away from the through hole 10. In the embodiment, the first elastic element 53 is in a ring structure, and correspondingly, the first metal piece 51 and the second metal piece 52 are also in a ring structure. In other embodiments, the number of the first elastic element 53 can be multiple, and the multiple first elastic elements 53 are arranged at intervals. Correspondingly, the number of the first metal piece 51 and the second metal piece 52 fixing the first elastic element 53 can also be multiple. In the embodiment, the number of the second elastic element 54 is multiple, and the multiple second elastic elements 54 are arranged at intervals. Specifically, the number of the second elastic element 54 is four, and correspondingly, the number of the first metal piece 51 and the second metal piece 52 fixing the second elastic element 54 can also be multiple, wherein part of the second elastic elements 54 are directly glued to the carrier frame 3 and the support frame 4. In other embodiments, the second elastic element 54 can also be in a ring structure, and correspondingly, the first metal piece 51 and the second metal piece 52 fixing the second elastic element 54 are also in a ring structure.

[0031] The first driving assembly 6 is provided in a pair of positions, and each of the positions is located at a corner of a pair of diagonal lines of the lens driving assembly 100. The first driving assembly 6 drives the carrier frame 3 and the lens 2 to move along the optical axis O, and each of the first driving assemblies 6 comprises a magnetic frame 61 fixed to the support frame 4 and having a receiving space 610, a first magnetic steel assembly 62 located in the receiving space 610, and a first coil 63 arranged around the first magnetic steel assembly 62. The magnetic frame 61 is made of a magnetic conductive material and comprises a frame body 611 and a cover 612 arranged on the frame body 611. The frame body 611 is provided with a notch 613, and the extension arm 32 of the carrier frame 3 is fixedly connected with the first coil 63 through the notch 613. The first magnetic steel assembly 62 comprises a first magnetic steel 621, a second magnetic steel 622 arranged above the first magnetic steel 621, and a pole core 623 clamped between the first magnetic steel 621 and the second magnetic steel 622. The first magnetic steel 621 and the second magnetic steel 622 are magnetized along the optical axis O, and the first magnetic steel 621 and the second magnetic steel 622 are arranged in opposite poles.

[0032] The second driving assembly 7 is provided in a pair of positions, and each of the positions is located at a corner of another pair of diagonal lines of the lens driving assembly 100. The second driving assembly 7 drives the support frame 4, the carrier frame 3, and the lens 2 to move along a direction perpendicular to the optical axis O. Each of the second driving assemblies 7 comprises a first magnetic conductive plate 71 fixed to the bottom plate 12 and arranged along one straight line constituting the corner 101, a first group of magnetic steels 72 located on the first magnetic conductive plate 71, a first driving coil 73 arranged at a side close to the through hole 10 and spaced apart from the first group of magnetic steels 72, a second magnetic conductive plate 74 arranged along another straight line constituting the corner 101, a second group of magnetic steels 75 located on the second magnetic conductive plate 74, and a second driving coil 76 arranged at a side close to the through hole 10 and spaced apart from the second group of magnetic steels 75. The first driving coil 73 and the second driving coil 76 are fixed to the support frame 4.

[0033] Taking the first group of magnetic steels 72 as an example, the first group of magnetic steels 72 comprises a first driving magnetic steel 721, a second driving magnetic steel 722, and a third driving magnetic steel 723 arranged side by side. The first driving magnetic steel 721 and the third driving magnetic steel 723 are magnetized along the optical axis O, and the magnetization directions of the first driving magnetic steel 721 and the third driving magnetic steel 723 are opposite. The second driving magnetic steel 722 is magnetized along a direction perpendicular to the optical axis O.

[0034] The first circuit board 81 is electrically connected with the first coil 63, one end of the first circuit board 81 is fixed to the carrier frame 3, and the other end is fixed to the support frame 4. Specifically, the first circuit board 81 includes a first contact part 811 fixed to the carrier frame 3, a second contact part 812 fixed to the support frame 4, and a connecting part 813 connecting the first contact part 811 and the second contact part 812, and the first contact part 811 is a ring structure.

[0035] The second circuit board 82 includes a first conductive part 821 extending out of the shell, a second conductive part 822 fixed to the bottom surface of the support frame 4, and a transition part 823 connecting the first conductive part 821 and the second conductive part 822. The second circuit board 82 is directly electrically connected with the first drive coil 73 and the second drive coil 76 to supply power to the first drive coil 73 and the second drive coil 76.

[0036] The first coil 63 is connected with the first contact part 811 of the first circuit board 81, and the second contact part 812 of the first circuit board 81 is connected with the second conductive part 822 of the second circuit board 82 through the electric connecting piece 91, so that the first coil 63 is electrified.

[0037] The electric connecting piece 91 is made of metal material, one end of the electric connecting piece 91 is clamped between the first circuit board 81 and the support frame 4, and the other end of the electric connecting piece 91 is clamped between the first drive coil 73 and the support frame 4

[0038] The elastic support 92 is a pair, the elastic support 92 elastically supports the support frame 4, the elastic support 92 includes a first support part 921 fixed to the bottom plate 12 of the shell 1, a second support part 922 fixed to opposite sides of the support frame 4, and a connecting part 923 connecting the first support part 921 and the second support part 922.

[0039] Compared with the related art, the lens driving device provided by the application comprises a shell with a through hole, a lens arranged in the shell and partially extending beyond the shell, a carrier frame bearing the lens, a support frame arranged around the carrier frame, an elastic element elastically connecting the carrier frame to the support frame, a first driving assembly arranged at a corner position of the lens driving device, and a second driving assembly arranged at another corner position of the lens driving device, the lens has an optical axis, the first driving assembly drives the carrier frame and the lens to move along the direction of the optical axis, the second driving assembly drives the support frame, the carrier frame and the lens to move along the direction perpendicular to the optical axis, and the elastic element is made of a high polymer material. The lens driving device of the application adopts a high polymer elastic element, which occupies a small space and can provide a larger movement stroke of the lens during automatic focusing of the lens. Meanwhile, the reliability of the elastic element is higher during drop resistance and fatigue resistance tests of the lens driving device.

[0040] The above merely describes the embodiments of the application, and it should be pointed out that those skilled in the art can make improvements without departing from the concept of the application, and these improvements are within the protection scope of the application.

Claims

1. A lens driving device characterized by comprising: The lens driving device comprises a housing with a through hole, a lens arranged in the housing and partially extending beyond the housing, a carrier frame carrying the lens, a support frame arranged around the carrier frame, an elastic element elastically connecting the carrier frame to the support frame, a first driving assembly arranged at a corner position of the lens driving device, and a second driving assembly arranged at another corner position of the lens driving device, the lens has an optical axis, the first driving assembly drives the carrier frame and the lens to move along the direction of the optical axis, the second driving assembly drives the support frame, the carrier frame and the lens to move along the direction perpendicular to the optical axis, and the elastic element is made of a high polymer material.

2. The lens driving device according to claim 1, wherein: The elastic element is in a wave shape.

3. The lens driving device according to claim 1, wherein: The lens driving device further comprises a first metal piece fixing one end of the elastic element to the carrier frame and / or a second metal piece fixing the other end of the elastic element to the support frame.

4. The lens driving device according to claim 1, wherein: The elastic element is made of at least one of silica gel, rubber, polyether ether ketone and polyimide.

5. The lens driving device according to claim 1, wherein: The elastic element comprises a first elastic element arranged on the side of the carrier frame close to the through hole and a second elastic element arranged on the side of the carrier frame away from the through hole, the first elastic element is in a ring structure, and / or the second elastic element is in a ring structure.

6. The lens driving apparatus according to claim 1, wherein: The elastic element comprises a first elastic element arranged on the side of the carrier frame close to the through hole and a second elastic element arranged on the side of the carrier frame away from the through hole, the number of the first elastic elements is plural, and the plural first elastic elements are arranged at intervals, and / or the number of the second elastic elements is plural, and the plural second elastic elements are arranged at intervals.

7. The lens driving apparatus according to claim 1, wherein: The first driving assembly comprises a magnetic frame fixed to the support frame and having a receiving space, a first magnetic steel assembly located in the receiving space, and a first coil arranged around the first magnetic steel assembly, the magnetic frame is provided with a notch, and the carrier frame comprises an extension arm fixedly connected with the first coil through the notch.

8. The lens driving apparatus according to claim 1, wherein: The second driving assembly comprises a first group of magnetic steels fixed to the housing and arranged along one straight side constituting the corner, a first driving coil arranged at intervals on the side of the first group of magnetic steels close to the through hole, a second group of magnetic steels arranged along the other straight side constituting the corner, and a second driving coil arranged at intervals on the side of the second group of magnetic steels close to the through hole, and the first driving coil and the second driving coil are fixed to the support frame.

9. The lens driving device according to claim 7, wherein: The lens driving device further comprises a first circuit board electrically connected with the first coil, one end of the first circuit board is fixed to the carrier frame, and the other end of the first circuit board is fixed to the support frame.

10. The lens driving apparatus according to claim 1, wherein: The lens driving device further comprises an elastic support supporting the support frame elastically, the elastic support comprises a first support portion fixed to the housing, a second support portion fixed to opposite sides of the support frame, and a connecting portion connecting the first support portion and the second support portion.

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