Lens driving device

Abstract

A lens driving device (100), comprising a housing (1), the housing (1) comprising a bottom plate (11) and an upper cover (12); a first mount (2), the first mount (2) being elastically supported on the bottom plate (11); a second mount (3), the second mount (3) being elastically supported on the first mount (2), and the second mount (3) being used for mounting a lens module (4); first driving assemblies (5), there being two first driving assemblies (5) that are used for driving the lens module (4) to move in the optical axis direction of the lens module (4), and each first driving assembly (5) comprising a first magnetic circuit system (51) fixed to the first mount (2) and a driving coil (52) fixed to the second mount (3); and second driving assemblies (6), the second driving assemblies (6) being used for driving the second mount (3) to move in the direction perpendicular to the optical axis of the lens module (4), and each second driving assembly (6) comprising a second magnetic circuit system (61) fixed to the bottom plate (11) and an anti-shake coil (62) fixed to the first mount (2). The lens driving device (100) not only can reduce the risk of failure of a lens module cylinder due to falling, but also can inhibit the swinging mode of the lens module cylinder.

Description

Lens driving device TECHNICAL FIELD

[0001] The present application belongs to the technical field of shooting equipment, and particularly relates to a lens driving device. BACKGROUND

[0002] With the improvement of living standards, some devices with shooting functions such as digital cameras, digital video cameras, smart phones and tablet computers have all been equipped with automatic focusing cameras, and the automatic focusing cameras need to be driven by a lens driving device to realize automatic focusing and optical image stabilization.

[0003] The lens driving device comprises a housing, a first support, a second support spaced from the first support, and a driving assembly for driving a lens module to move along an optical axis direction and a direction perpendicular to the optical axis direction; wherein the second support is used for mounting the lens module, and the driving assembly mainly comprises a common magnetic circuit system and a driving coil and an anti-shake coil.

[0004] The magnetic circuit system in the related art is mainly arranged on two pairs of straight edges of the support and adopts an open magnetic circuit, the driving coil is fixed to the second support, and the anti-shake coil is fixed to the bottom plate of the housing. This driving mode using the same open magnetic circuit system will exhibit as an ineffective mass when the lens module moves. TECHNICAL PROBLEM

[0005] The embodiment of the present application provides a lens driving device, which aims to solve the problem that the driving mode using the same open magnetic circuit system of the lens driving device in the related art will exhibit as an ineffective mass when the lens module moves. TECHNICAL SOLUTION

[0006] The embodiment of the present application is implemented in this way, and provides a lens driving device, which comprises:

[0007] The housing is in a rectangular shape, and comprises a bottom plate and an upper cover arranged on the bottom plate and surrounding the bottom plate to form a receiving space, and the bottom plate and the upper cover are respectively provided with through holes for connecting the receiving space with the outside;

[0008] The first support is in a rectangular ring shape and is elastically supported on the bottom plate, and the first support is located in the receiving space;

[0009] The second support is elastically supported on the inner side of the first support, and the second support is arranged in a spaced manner with the first support; the second support is opposite to the through hole and is used for mounting the lens module;

[0010] The first driving assembly includes two first driving assemblies respectively arranged at a diagonal position of the first support, and the two first driving assemblies are used to drive the second support to move along the optical axis direction of the lens module; the first driving assembly includes a first magnetic circuit system fixed to the first support and a driving coil fixed to the second support; the first magnetic circuit system includes a magnetic bowl fixed to the first support, a first magnetic steel assembly fixed to the magnetic bowl in a stacked manner, and a clamping plate fixed to the opening end of the magnetic bowl in a stacked manner, the magnetic bowl is provided with two notches on opposite sides, the driving coil is arranged around the first magnetic steel assembly and spaced from the first magnetic steel assembly, and the driving coil extends to the outside of the magnetic bowl through the notches and is fixedly connected with the second support;

[0011] The second driving assembly is used to drive the second support to move along a direction perpendicular to the optical axis of the lens module; the second driving assembly includes a second magnetic circuit system fixed to the bottom plate and an anti-shake coil fixed to the first support and spaced from the second magnetic circuit system.

[0012] Preferably, the magnetic bowl includes a bowl bottom and a side wall extending from the circumferential side of the bowl bottom, and the two notches are formed in the side wall; the first magnetic steel assembly includes a first driving magnetic steel fixed to the bowl bottom in a stacked manner, a first pole core fixed to the side of the first driving magnetic steel away from the bowl bottom in a stacked manner, and a second driving magnetic steel fixed to the side of the first pole core away from the first driving magnetic steel in a stacked manner, and the upper clamping plate is fixed to the side of the second driving magnetic steel away from the first pole core in a stacked manner.

[0013] Preferably, one diagonal position of the inner circumferential side of the first support is provided with two recesses formed by inwardly recessing; the magnetic bowls in the two first driving assemblies are respectively fixed in the two recesses.

[0014] Preferably, the second driving assembly includes two second driving assemblies, and the anti-shake coils in the two second driving assemblies are respectively arranged at another diagonal position of the first support; the second magnetic circuit system includes two groups of second lower clamping plates fixed to the opposite corner positions of the bottom plate and two groups of second magnetic steel assemblies fixed to the sides of the two groups of second lower clamping plates away from the bottom plate in a stacked manner.

[0015] Preferably, the second magnetic steel assembly includes a first anti-shake magnetic steel, a second anti-shake magnetic steel, and a third anti-shake magnetic steel fixed to the second lower clamping plate in a stacked manner and arranged in a direction perpendicular to the optical axis in sequence, and the first anti-shake magnetic steel, the second anti-shake magnetic steel, and the third anti-shake magnetic steel are fixedly connected with each other.

[0016] Preferably, the lens driving device further comprises a first elastic member, the first elastic member is connected to the first support and the bottom plate respectively, and the first elastic member elastically supports the first support on the bottom plate.

[0017] Preferably, each of the second driving assemblies comprises two anti-shake coils, and the two anti-shake coils are parallel to two sides of a same corner position of the corresponding first support; the lens driving device further comprises a flexible circuit board fixed to a side of the first elastic member away from the first support, all the anti-shake coils in the second driving assemblies are electrically connected to the flexible circuit board, and the flexible circuit board extends out of the housing through the bottom plate.

[0018] Preferably, the lens driving device further comprises an elastic assembly, the elastic assembly is connected to the second support and the first support respectively, and the elastic assembly elastically supports and suspends the second support in the first support.

[0019] Preferably, the elastic assembly comprises second, third and fourth elastic members spaced from each other, the second elastic members are connected to top regions of the second support and the first support respectively, the third elastic members are connected to middle regions of the second support and the first support respectively, and the fourth elastic members are connected to bottom regions of the second support and the first support respectively.

[0020] Preferably, the fourth elastic members comprise four fourth elastic members fixed to four corner positions of the second support and the first support respectively. Beneficial effects

[0021] Compared with the prior art, the lens driving device in the application sets two first driving assemblies at a group of diagonal positions of the first support respectively, limits two notches on opposite sides of the magnetic bowl of the first driving assembly, and fixes the upper clamping plate on the opening end of the magnetic bowl, so that the first magnetic circuit system forms a closed top-to-top magnetic circuit, fixes the second magnetic circuit system in the first driving assembly on the bottom plate, and fixes the anti-shake coil of the first driving assembly on the first support, so that the second magnetic circuit system in the second driving assembly does not participate in the movement of the lens module along the optical axis direction, the total mass of the lens module moving along the optical axis direction is reduced, the sensitivity of the first magnetic circuit system driving the lens module moving along the optical axis direction is improved, the risk of lens module falling failure is reduced, and the mass of the anti-shake coil can effectively balance the mass of the first magnetic circuit system, so that the swing mode of the lens module can be suppressed under the premise of reducing the total mass of the lens module. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0023] Fig. 1 is a schematic diagram of the overall structure of a lens driving device according to an embodiment of the present application;

[0024] Fig. 2 is a schematic diagram of the structure of a lens driving device according to an embodiment of the present application;

[0025] Fig. 3 is a sectional view along line A-A in Fig. 1;

[0026] Fig. 4 is a sectional view along line B-B in Fig. 1.

[0027] In the drawings: 100, lens driving device; 1, housing; 10, through hole; 11, bottom plate; 12, upper cover; 2, first support; 21, groove; 3, second support; 4, lens module; 5, first driving assembly; 51, first magnetic circuit system; 511, magnetic bowl; 5111, bowl bottom; 5112, side wall; 512, first magnetic steel assembly; 5121, first driving magnetic steel; 5122, first pole core; 5123, second driving magnetic steel; 513, upper clamping plate; 52, driving coil; 6, second driving assembly; 61, second magnetic circuit system; 611, second lower clamping plate; 612, second magnetic steel assembly; 6121, first anti-shake magnetic steel; 6122, second anti-shake magnetic steel; 6123, third anti-shake magnetic steel; 62, anti-shake coil; 7, first elastic member; 8, flexible circuit board; 9, elastic assembly; 91, second elastic member; 92, third elastic member; 921, connecting member; 93, fourth elastic member. Embodiment of the present application

[0028] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0029] The embodiment of the present application provides a lens driving device 100, which, in combination with Figs. 1 to 4, comprises a housing 1, a first support 2, a second support 3, a first driving assembly 5 and a second driving assembly 6.

[0030] The shell 1 is rectangular, and the shell 1 comprises a bottom plate 11 and an upper cover 12 arranged on the bottom plate 11 and surrounding the bottom plate 11 to form a receiving space, and the bottom plate 11 and the upper cover 12 are respectively provided with a through hole 10 for connecting the receiving space with the outside; the first support 2 is in the form of a rectangular ring and is elastically supported on the bottom plate 11, and the first support is located in the receiving space; the second support 3, also referred to as a lens barrel, is in the form of a ring and is elastically supported on the inner side of the first support 2, and the second support 3 is arranged in spaced relation with the first support 2, the second support 3 is opposite to the through hole 10, and is used for mounting a lens module 4.

[0031] One group of diagonal positions on the inner circumferential side of the first support 2 are respectively provided with two recesses 21 formed by inwardly recessing.

[0032] Specifically, the first driving assembly 5 comprises a first magnetic circuit system 51 fixed to the first support 2 and a driving coil 52 fixed to the second support 3.

[0033] The first magnetic circuit system 51 comprises a magnetic bowl 511 fixed to the first support 2, a first magnetic steel assembly 512 stacked and fixed to the magnetic bowl 511, and an upper clamping plate 513 stacked and fixed to the opening end of the magnetic bowl 511, opposite sides of the magnetic bowl 511 are provided with two notches, the driving coil 52 is arranged around the first magnetic steel assembly 512 and is spaced from the first magnetic steel assembly 512, the driving coil 52 extends to the outside of the magnetic bowl 511 through the notches and is fixedly connected with the second support 3.

[0034] The magnetic bowl 511 comprises a bowl bottom 5111 and a side wall 5112 formed by bending and extending from the circumferential side of the bowl bottom 5111, and the two notches are both arranged in the side wall 5112.

[0035] The first magnetic steel assembly 512 comprises a first driving magnetic steel 5121 stacked and fixed to the magnetic bowl 511, a first pole core 5122 stacked and fixed to one side of the first driving magnetic steel 5121 away from the magnetic bowl 511, and a second driving magnetic steel 5123 stacked and fixed to one side of the first pole core 5122 away from the first driving magnetic steel 5121, and the upper clamping plate 513 is stacked and fixed to one side of the second driving magnetic steel 5123 away from the first pole core 5122.

[0036] The first driving assembly 5 comprises two, and the two first driving assemblies 5 are respectively arranged at one group of diagonal positions of the first support 2, and the magnetic bowls 511 of the two first driving assemblies 5 are respectively fixed in the two recesses 21; the two first driving assemblies 5 are used for driving the second support 3 to move along the optical axis direction of the lens module 4.

[0037] Specifically, the second driving assembly 6 is used for driving the second support 3 to move along a direction perpendicular to the optical axis direction of the lens module 4; the second driving assembly 6 comprises a second magnetic circuit system 61 fixed to the bottom plate 11 and an anti-shake coil 62 fixed to the first support 2 and spaced from the second magnetic circuit system 61.

[0038] The second driving assembly 6 includes two anti-shake coils 62, and the two anti-shake coils 62 are respectively arranged at the other two diagonal positions of the first support 2.

[0039] Each of the second driving assembly 6 includes two anti-shake coils 62, and the two anti-shake coils 62 are respectively arranged at the other two diagonal positions of the first support 2.

[0040] The second magnetic system 61 includes two sets of second lower clamping plates 611 fixed at the opposite two corner positions of the bottom plate 11 and two sets of second magnetic steel assemblies 612 respectively stacked and fixed on the side away from the bottom plate 11 of the two sets of second lower clamping plates 611.

[0041] Specifically, the lens driving device 100 further includes a first elastic member 7, and the first elastic member 7 is connected to the first support 2 and the bottom plate 11 respectively and elastically supports the first support 2 suspended on the bottom plate 11.

[0042] Specifically, each of the second driving assembly 6 includes two anti-shake coils 62, and the two anti-shake coils 62 are respectively arranged at the other two diagonal positions of the first support 2.

[0043] Specifically, the lens driving device 100 further includes a first elastic member 7, and the first elastic member 7 is connected to the first support 2 and the bottom plate 11 respectively and elastically supports the first support 2 suspended on the bottom plate 11.

[0044] Specifically, the lens driving device 100 further includes a first elastic member 7, and the first elastic member 7 is connected to the first support 2 and the bottom plate 11 respectively and elastically supports the first support 2 suspended on the bottom plate 11.

[0045] The second elastic member 91 is annular and wavy; the third elastic member 92 comprises a first fixed arm in an annular shape and fixed to the second support 3, two elastic arms respectively formed by bending and extending from opposite ends of the first fixed arm, and a second fixed arm formed by extending from one end of the elastic arm away from the first fixed arm, and the second fixed arm is fixed to the first support 2; the fourth elastic member 93 comprises four fourth elastic members 93, which are arranged at intervals and respectively in a wavy shape.

[0046] The third elastic member 92 is connected with the flexible circuit board 8 through the connecting member 921 fixed to the first support 2, and the third elastic member 92 is an elastic circuit board and is electrically connected with the two drive coils 52 in the first drive assembly 5, so as to realize the electrical connection between the drive coil 52 and the flexible circuit board 8 at intervals.

[0047] The fourth elastic member 93 comprises four fourth elastic members 93, which are respectively fixed to the corresponding four corner positions of the second support 3 and the first support 2.

[0048] The lens driving device 100 in the embodiment is provided with two first drive assemblies 5 at one set of opposite corner positions of the first support 2, and the opposite sides of the magnetic bowl 511 are provided with two notches, and the upper clamping plate 513 is fixed to the opening end of the magnetic bowl 511, so that the first magnetic circuit system 51 forms a closed top-to-top magnetic circuit, and the second magnetic circuit system 61 in the first drive assembly 5 is fixed to the bottom plate 11, and the anti-shake coil 62 is fixed to the first support 2, so that the second magnetic circuit system 61 in the second drive assembly 6 does not participate in the movement of the lens module 4 along the optical axis direction, the total mass of the lens module 4 moving along the optical axis direction is reduced, the sensitivity of the first magnetic circuit system 51 driving the lens module 4 to move along the optical axis direction is improved, the risk of falling failure of the lens module 4 is reduced, and the mass of the anti-shake coil 62 can effectively balance the mass of the first magnetic circuit system 51, so that the swing mode of the lens module 4 can be suppressed under the premise of reducing the total mass of the lens module 4.

[0049] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lens driving device characterized by comprising: The lens driving device comprises: a housing, the housing is rectangular, the housing comprises a bottom plate and an upper cover arranged on the bottom plate and surrounding the bottom plate to form a receiving space, the bottom plate and the upper cover are respectively provided with a through hole for connecting the receiving space with the outside; a first support, the first support is rectangular and elastically supported on the bottom plate, the first support is located in the receiving space; a second support, the second support is elastically supported on the inner side of the first support, and the second support is arranged in spaced relation with the first support; the second support is opposite to the through hole and used for mounting a lens module; a first driving assembly, the first driving assembly comprises two, two first driving assemblies are respectively arranged at one set of diagonal positions of the first support, and two first driving assemblies are used for driving the second support to move along the optical axis direction of the lens module; the first driving assembly comprises a first magnetic circuit system fixed on the first support and a driving coil fixed on the second support; the first magnetic circuit system comprises a magnetic bowl fixed on the first support, a first magnetic steel assembly fixed in the magnetic bowl, and an upper clamping plate fixed on the opening end of the magnetic bowl; the magnetic bowl is provided with two notches on opposite sides; the driving coil is arranged around the first magnetic steel assembly and spaced from the first magnetic steel assembly; the driving coil extends to the outside of the magnetic bowl through the notches and is fixedly connected with the second support; a second driving assembly, the second driving assembly is used for driving the second support to move along the direction perpendicular to the optical axis of the lens module; the second driving assembly comprises a second magnetic circuit system fixed on the bottom plate and an anti-shake coil fixed on the first support and spaced from the second magnetic circuit system.

2. The lens driving device according to claim 1, wherein The magnetic bowl comprises a bowl bottom and a side wall bent and extended from the circumferential side of the bowl bottom, and two notches are arranged in the side wall; the first magnetic steel assembly comprises a first driving magnetic steel fixed on the bowl bottom, a first pole core fixed on the side of the first driving magnetic steel away from the bowl bottom, and a second driving magnetic steel fixed on the side of the first pole core away from the first driving magnetic steel; and the upper clamping plate is fixed on the side of the second driving magnetic steel away from the first pole core.

3. The lens driving apparatus according to claim 1, wherein One set of diagonal positions of the inner periphery of the first support is respectively provided with two recesses formed by inwardly recessing; the magnetic bowls in two first driving assemblies are respectively fixed in two recesses.

4. The lens driving apparatus according to claim 1, wherein The second driving assembly comprises two, the anti-shake coils in two second driving assemblies are respectively arranged at the other set of diagonal positions of the first support; the second magnetic circuit system comprises two sets of second lower clamping plates fixed on opposite corner positions of the bottom plate and two sets of second magnetic steel assemblies fixed on the sides of the two sets of second lower clamping plates away from the bottom plate.

5. The lens driving apparatus according to claim 4, wherein The second magnetic steel assembly comprises a first anti-shake magnetic steel, a second anti-shake magnetic steel and a third anti-shake magnetic steel fixed on the second lower clamping plate and arranged in sequence along the direction perpendicular to the optical axis; the first anti-shake magnetic steel, the second anti-shake magnetic steel and the third anti-shake magnetic steel are fixedly connected with each other.

6. The lens driving apparatus according to claim 1, wherein The lens driving device further comprises a first elastic member, which is connected to the first support and the bottom plate respectively and elastically supports the first support on the bottom plate.

7. The lens driving apparatus according to claim 6, wherein Each of the second driving assemblies comprises two anti-shake coils, which are parallel to two sides of a same corner position of the corresponding first support respectively; the lens driving device further comprises a flexible circuit board fixed to a side of the first elastic member away from the first support, all the anti-shake coils in the second driving assemblies are electrically connected to the flexible circuit board, and the flexible circuit board extends out of the housing through the bottom plate.

8. The lens driving apparatus of claim 1, wherein The lens driving device further comprises an elastic assembly, which is connected to the second support and the first support respectively and elastically supports the second support in the first support.

9. The lens driving apparatus according to claim 8, wherein The elastic assembly comprises second, third and fourth elastic members which are spaced from each other, the second elastic members are connected to top regions of the second support and the first support respectively, the third elastic members are connected to middle regions of the second support and the first support respectively, and the fourth elastic members are connected to bottom regions of the second support and the first support respectively.

10. The lens driving apparatus according to claim 9, wherein The fourth elastic members comprise four fourth elastic members which are fixed to four corner positions of the second support and the first support respectively.

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