Lens driving device

Abstract

The utility model provides a lens driving device comprising a housing which comprises a bottom plate and an upper cover. The first bracket is elastically supported on the bottom plate; the second bracket is elastically supported on the first bracket and is used for mounting a lens module; the first driving assembly comprises a first magnetic circuit system fixed on the first bracket and a driving coil fixed on the second bracket; the guide rod is fixed on the first bracket and is in sliding connection with the second bracket; and the second driving assembly comprises a second magnetic circuit system and an anti-shake coil which is relatively spaced from the second magnetic circuit system. The lens driving device provided by the utility model not only can improve the driving force when the first magnetic circuit system drives the lens module to move along the optical axis direction, but also can guide the second bracket through the added guide rod, thereby inhibiting the deflection motion when the lens module moves along the optical axis direction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photographic equipment technical field, especially relate to a lens drive device. BACKGROUND

[0002] With the improvement of living standards, some devices with shooting function such as digital camera, digital video camera, smart phone, tablet computer have all been provided with automatic focusing camera, and the automatic focusing camera needs lens drive device to drive to realize automatic focusing and optical anti-shake.

[0003] The lens drive device comprises a shell, a first support, a second support spaced from the first support and a driving assembly for driving the lens module to move along the optical axis direction and along the 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] In the related art, the common magnetic circuit system of the lens drive device adopts an open-loop magnetic circuit, which can cause insufficient driving force when the common magnetic circuit system drives the lens module to move along the optical axis direction. In addition, the lens module can also produce a yawing motion when moving. SUMMARY

[0005] The embodiment of the utility model provides a kind of lens drive device, to solve the problem that the lens drive device in the related art can cause insufficient driving force when the common magnetic circuit system drives the lens module to move along the optical axis direction, and the lens module can also produce a yawing motion when moving.

[0006] The embodiment of the utility model is realized as follows, a kind of lens drive device is provided, comprising:

[0007] The shell 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 upper cover is provided with a light hole for communicating the receiving space with the outside world;

[0008] The first support is in the form of a rectangular ring 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 is spaced from the first support;The second support is opposite to the light hole and is used for mounting the lens module;

[0010] A first driving assembly is configured to drive the second holder to move relative to the first holder along an optical axis of the lens module; the first driving assembly comprises a first magnetic circuit system fixed to the first holder and a driving coil fixed to the second holder; the first magnetic circuit system comprises a magnetic bowl fixed to the first holder, a magnetic steel assembly fixed to the magnetic bowl in a stacked manner, and an upper clamping plate fixed to an opening end of the magnetic bowl in a stacked manner; opposite sides of the magnetic bowl are provided with two notches extending along the optical axis of the lens module; the driving coil is located in the magnetic bowl and arranged around the magnetic steel assembly in a spaced manner; the second holder is provided with two clamping arms respectively extending into the magnetic bowl from the two notches; the two clamping arms are respectively fixedly connected with the driving coil.

[0011] A guide rod is arranged in a spaced manner with the first driving assembly; the guide rod is fixed to the first holder and extends along the optical axis direction of the lens module; the guide rod is in sliding connection with the second holder and guides the second holder to move along the optical axis direction of the lens module.

[0012] A second driving assembly is configured to drive the second holder to move relative to the bottom plate along a direction perpendicular to the optical axis of the lens module; the second driving assembly comprises a second magnetic circuit system and an anti-shake coil spaced from the second magnetic circuit system; the second magnetic circuit system is fixed to one of the bottom plate and the first holder; and the anti-shake coil is fixed to the other one of the bottom plate and the first holder.

[0013] Preferably, the first driving assembly and the guide rod each comprise one; the first driving assembly and the guide rod are respectively located at one set of diagonal positions of the first holder; the second driving assembly comprises two sets; the two sets of second driving assemblies are respectively located at another set of diagonal positions of the first holder; each set of second driving assemblies comprises two second driving assemblies respectively located at adjacent two sides of the first holder.

[0014] Preferably, the first holder comprises a first side, a second side, a third side and a fourth side connected in sequence; the first driving assembly comprises one; the first driving assembly is located at a corner position formed by the first side and the second side; the guide rod comprises a first guide rod, a second guide rod and a third guide rod; the first guide rod is located at a corner position formed by the second side and the third side; the second guide rod is located at a corner position formed by the third side and the fourth side; and the third guide rod is located at the middle of the first side; the second driving assembly comprises two; the two second driving assemblies are respectively located at the third side and the fourth side.

[0015] Preferably, the first driving assembly and the guide rod each include two, the two first driving assemblies are respectively located at one set of corner positions of the first support, and the two guide rods are respectively located at another set of corner positions of the first support; the second driving assembly includes two, and the two second driving assemblies are respectively located at two adjacent sides of the first support.

[0016] Preferably, the first driving assembly and the guide rod each include two, the two first driving assemblies are respectively located at one set of diagonal positions of the first support, and the two guide rods are respectively located at the middle of the two opposite sides of the first support; the second driving assembly includes two, and the two second driving assemblies are respectively located at another set of diagonal positions of the first support.

[0017] 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 both arranged on the side wall; the magnetic steel assembly includes a first driving magnetic steel fixedly stacked on the bowl bottom, a pole core fixedly stacked on the side of the first driving magnetic steel away from the bowl bottom, and a second driving magnetic steel fixedly stacked on the side of the pole core away from the first driving magnetic steel, and the upper clamping plate is fixedly stacked on the side of the second driving magnetic steel away from the pole core.

[0018] Preferably, the first support is provided with a support portion extending inward and spaced from the bottom plate on the side close to the bottom plate, and a support plate opposite to the support portion is fixed to the side of the first support away from the bottom plate; the second support is provided with an extension portion extending outward at the position close to the support portion, and the extension portion is provided with a through hole penetrating therethrough; one end of the guide rod is fixed to the support plate, and the other end of the guide rod extends to the support portion through the through hole, the guide rod and the through hole form a sliding connection, and the guide rod penetrates through the support portion and forms a fixed connection with the support portion.

[0019] Preferably, the second magnetic circuit system includes a lower clamping plate fixed to the bottom plate, a first anti-shake magnetic steel, a second anti-shake magnetic steel, and a third anti-shake magnetic steel fixedly stacked on the lower clamping plate and arranged in sequence along the direction perpendicular to the optical axis of the lens module; 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.

[0020] Preferably, the lens driving device further includes a first elastic member, the first elastic member is connected with the first support and the bottom plate respectively, and the first elastic member elastically supports the first support on the bottom plate.

[0021] Preferably, the lens driving device further comprises a second elastic member and a third elastic member which are spaced apart from each other, the second elastic member is connected to the side of the first support away from the bottom plate and the side of the second support away from the bottom plate respectively, and the third elastic member is connected to the side of the first support close to the bottom plate and the side of the second support close to the bottom plate respectively.

[0022] Compared with the related art, the lens driving device in the utility model decouples the first driving assembly and the second driving assembly, designs the first magnetic circuit system of the first driving assembly as a closed magnetic circuit structure, further provides a guide rod on the first support which forms a sliding connection with the second support, the closed magnetic circuit structure improves the driving force of the first magnetic circuit system when driving the lens module to move along the optical axis direction, and the guide rod can further guide the second support to inhibit the lens module from producing a yawing movement when moving along the optical axis direction. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the related art, the drawings needed to be used in the embodiment or the related art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0024] Figure 1 It is the three-dimensional structure schematic diagram of the lens driving device provided by the embodiment one of the utility model;

[0025] Figure 2 It is the partial structure exploded view of the lens driving device provided by the embodiment one of the utility model;

[0026] Figure 3 It is the section view along the A-A line of Figure 1 ;

[0027] Figure 4 It is the section view along the B-B line of Figure 1 ;

[0028] Figure 5 It is the quantity and the position relative to the bottom plate of the first driving assembly, the guide rod and the second driving assembly in the lens driving device provided by the embodiment one of the utility model;

[0029] Figure 6 It is the quantity and the setting position relative to the bottom plate of the first driving assembly, the guide rod and the second driving assembly in the lens driving device provided by the embodiment two of the utility model;

[0030] Figure 7is the schematic view of the number and the setting position of the first driving assembly, the guide rod and the second driving assembly relative to the bottom plate in the lens driving device provided by the embodiment three of the utility model;

[0031] Figure 8 is the schematic view of the number and the setting position of the first driving assembly, the guide rod and the second driving assembly relative to the bottom plate in the lens driving device provided by the embodiment four of the utility model.

[0032] Wherein, 100, lens driving device;101, lens module;1, shell;11, bottom plate;12, upper cover;13, light hole;2, first support;21, support part;22, support plate;24, first edge;25, second edge;26, third edge;27, fourth edge;3, second support;31, extension;32, through hole;33, clamping arm;4, first driving assembly;41, first magnetic circuit system;411, magnetic bowl;4111, bowl bottom;4112, side wall;412, magnetic steel assembly;4121, first driving magnetic steel;4122, pole core;4123, second driving magnetic steel;413, upper clamping plate;42, driving coil;5, guide rod;5a, first guide rod;5b, second guide rod;5c, third guide rod;6, second driving assembly;61, second magnetic circuit system;611, lower clamping plate;612, first anti-shake magnetic steel;613, second anti-shake magnetic steel;614, third anti-shake magnetic steel;62, anti-shake coil;7, first elastic piece;71, fixed part;8, flexible circuit board;91, second elastic piece;911, metal connecting piece;92, third elastic piece. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0034] Embodiment one

[0035] The utility model embodiment provides a kind of lens driving device 100, in combination Figures 1 to 4 As shown in the figure, it includes shell 1, first support 2, second support 3, first driving assembly 4, guide rod 5, second driving assembly 6.

[0036] The shell 1 includes 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, the upper cover 12 is provided with a light hole 13 for connecting the receiving space with the outside; the first support 2 is in the shape 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 is elastically supported on the inner side of the first support 2 and is arranged in a spaced manner with the first support 2, the second support 3 is opposite to the light hole 13 and is used for mounting the lens module 101.

[0037] In the embodiment, the light hole 13 is also arranged on the bottom plate 11, that is, the light hole 13 penetrates through the bottom plate 11 and connects the receiving space with the outside.

[0038] The first driving assembly 4 is used for driving the second support 3 to move relative to the first support 2 along the optical axis direction of the lens module 101; the guide rod 5 is fixed on the first support 2 and extends along the optical axis direction of the lens module 101, the guide rod 5 forms a sliding connection with the second support 3 and guides the second support 3 to move along the optical axis direction of the lens module 101; the second driving assembly 6 is used for driving the second support 3 to move relative to the bottom plate 11 along a direction perpendicular to the optical axis direction of the lens module 101.

[0039] The first driving assembly 4 includes a first magnetic circuit system 41 fixed on the first support 2 and a driving coil 42 fixed on the second support 3, the first magnetic circuit system 41 includes a magnetic bowl 411 fixed on the first support 2, a magnetic steel assembly 412 stacked and fixed in the magnetic bowl 411 and an upper clamping plate 413 stacked and fixed at the opening end of the magnetic bowl 411, opposite sides of the magnetic bowl 411 are provided with two notches extending along the optical axis direction of the lens module 101, the driving coil 42 is located in the magnetic bowl 411 and is arranged around the magnetic steel assembly 412 and is spaced from the magnetic steel assembly 412, the second support 3 is provided with two clamping arms 33 respectively extending into the magnetic bowl 411 from the two notches, and the two clamping arms 33 respectively form fixed connections with the driving coil 42.

[0040] The magnetic bowl 411 includes a bowl bottom 4111 and a side wall 4112 bent and extended from the circumferential side of the bowl bottom 4111, and the two notches are both arranged on the side wall 4112; the magnetic steel assembly 412 includes a first driving magnetic steel 4121 stacked and fixed on the bowl bottom 4111, a pole core 4122 stacked and fixed on the side of the first driving magnetic steel 4121 away from the bowl bottom 4111 and a second driving magnetic steel 4123 stacked and fixed on the side of the pole core 4122 away from the first driving magnetic steel 4121, and the upper clamping plate 413 is stacked and fixed on the side of the second driving magnetic steel 4123 away from the pole core 4122.

[0041] The first support 2 is provided with a support portion 21 extending inwardly and spaced from the bottom plate 11 at one side of the first support 2 close to the bottom plate 11, and the first support 2 is fixed with a support plate 22 opposite to the support portion 21 at one side of the first support 2 away from the bottom plate 11, and the second support 3 is provided with an extension portion 31 extending outwardly at a position close to the support portion 21, and the extension portion 31 is provided with a through hole 32 penetrating therethrough; one end of the guide rod 5 is fixed to the support plate 22, and the other end of the guide rod 5 penetrates through the through hole 32 and extends to the support portion 21, and the guide rod 5 is in sliding connection with the through hole 32, and the guide rod 5 penetrates through the support portion 21 and is in fixed connection with the support portion 21. In this way, the guide rod 5 can be more stably fixed to the first support 2 and can penetrate through the second support 3.

[0042] 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 opposite to the second magnetic circuit system 61. Of course, according to actual requirements, the second magnetic circuit system 61 can also be fixed to the first support 2, and correspondingly the anti-shake coil 62 is fixed to the bottom plate 11.

[0043] The second magnetic circuit system 61 comprises a lower clamping plate 611 fixed to the bottom plate 11, a first anti-shake magnetic steel 612, a second anti-shake magnetic steel 613 and a third anti-shake magnetic steel 614 sequentially arranged along the direction perpendicular to the optical axis of the lens module 101 and fixed to the lower clamping plate 611 in a stacked manner, and the first anti-shake magnetic steel 612, the second anti-shake magnetic steel 613 and the third anti-shake magnetic steel 614 are fixedly connected with each other.

[0044] The lens driving device 100 further comprises a first elastic member 7 connecting the first support 2 and the bottom plate 11 respectively and elastically supporting the first support 2 on the bottom plate 11. In the embodiment, the first elastic member 7 comprises two and is respectively located at opposite sides of the first support 2, and each first elastic member 7 is connected with the bottom plate 11 through a fixing member 71.

[0045] The lens driving device 100 further comprises a flexible circuit board 8 fixed to one of the first elastic members 7 and electrically connected with all the anti-shake coils 62, and the flexible circuit board 8 extends outwardly through the upper cover 12.

[0046] The lens driving device 100 further comprises a second elastic member 91 and a third elastic member 92 spaced from each other; the second elastic member 91 is connected with one side of the second support 3 away from the bottom plate 11 and one side of the first support 2 away from the bottom plate 11 respectively, and the third elastic member 92 is connected with one side of the second support 3 close to the bottom plate 11 and one side of the first support 2 close to the bottom plate 11 respectively.

[0047] Both ends of all the drive coils 42 are electrically connected to the second elastic member 91, and the second elastic member 91 is electrically connected with the flexible circuit board 8 through a metal connecting member 911, that is, all the drive coils 42 are indirectly electrically connected with the flexible circuit board 8.

[0048] In the embodiment, as shown in Figure 5 The first driving assembly 4 and the guide rod 5 are respectively arranged at one set of diagonal positions of the first support 2. The second driving assembly 6 includes two sets, and the two sets of second driving assemblies 6 are respectively arranged at another set of diagonal positions of the first support 2. Each set of second driving assemblies 6 includes two second driving assemblies 6 respectively arranged at adjacent two sides of the first support 2.

[0049] Compared with the related art, the lens driving device 100 in the embodiment decouples the first driving assembly 4 and the second driving assembly 6, and designs the first magnetic circuit system 41 of the first driving assembly 4 as a closed magnetic circuit structure. In addition, the guide rod 5 is arranged on the first support 2 and forms a sliding connection with the second support 3. The closed magnetic circuit structure improves the driving force of the first magnetic circuit system 41 when driving the lens module 101 to move along the optical axis direction thereof. In addition, the guide rod 5 can guide the second support 3, thereby suppressing the yawing movement of the lens module 101 when moving along the optical axis direction thereof.

[0050] Embodiment two

[0051] The embodiment is different from the embodiment one in that, as shown in Figure 6 The first support 2 includes a first side 24, a second side 25, a third side 26 and a fourth side 27 connected in sequence. The first driving assembly 4 includes one, and the first driving assembly 4 is arranged at an angle position formed by the first side 24 and the second side 25. The guide rod 5 includes a first guide rod 5a, a second guide rod 5b and a third guide rod 5c. The first guide rod 5a is arranged at an angle position formed by the second side 25 and the third side 26. The second guide rod 5b is arranged at an angle position formed by the third side 26 and the fourth side 27. The third guide rod 5c is arranged at the middle of the first side 24. The second driving assembly 6 includes two, and the two second driving assemblies 6 are respectively arranged at the middle of the third side 26 and the middle of the fourth side 27.

[0052] Embodiment three

[0053] The embodiment is different from the embodiment one in that, as shown in Figure 7 The first driving assembly 4 and the guide rod 5 each include two. The two first driving assemblies 4 are respectively arranged at one set of angle positions of the first support 2. The two guide rods 5 are respectively arranged at another set of angle positions of the first support 2. The second driving assembly 6 includes two, and the two second driving assemblies 6 are respectively arranged at adjacent two sides of the first support 2.

[0054] Embodiment four

[0055] The embodiment is different from the embodiment one in that, as shown in Figure 8As shown, the first driving assembly 4 and the guide rod 5 respectively include two, two first driving assemblies 4 are respectively located in one group of diagonal positions of the first support 2, and two guide rods 5 are respectively located in the middle of opposite two sides of the first support 2; the second driving assembly 6 includes two, two second driving assemblies 6 are respectively located in another group of diagonal positions of the first support 2.

[0056] Of course, according to the size of the lens driving device 100, the number and setting position of the first driving assembly 4, the guide rod 5 and the second driving assembly 6 can also be designed in other ways, which will not be exemplified here.

[0057] The above only describes the preferred embodiment of the present application, and is not intended 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 comprising a bottom plate and an upper cover arranged on the bottom plate and surrounding the bottom plate to form a receiving space, the upper cover being provided with a light hole for communicating the receiving space with the outside; a first support frame in the shape of a rectangular ring and elastically supported on the bottom plate, the first support frame being located in the receiving space; a second support frame elastically supported on the inner side of the first support frame and arranged in spaced relation with the first support frame, the second support frame being opposite to the light hole and used for mounting a lens module; a first driving assembly for driving the second support frame to move relative to the first support frame along the optical axis direction of the lens module, the first driving assembly comprising a first magnetic circuit system fixed to the first support frame and a driving coil fixed to the second support frame, the first magnetic circuit system comprising a magnetic bowl fixed to the first support frame, a magnetic steel assembly fixed in the magnetic bowl in a stacked manner, and an upper clamping plate fixed to the opening end of the magnetic bowl in a stacked manner, the magnetic bowl being provided with two notches extending along the optical axis direction of the lens module at opposite sides thereof, the driving coil being located in the magnetic bowl and arranged around the magnetic steel assembly in spaced relation with the magnetic steel assembly, the second support frame being provided with two clamping arms respectively extending into the magnetic bowl from the two notches, the two clamping arms being respectively in fixed connection with the driving coil; a guide rod arranged in spaced relation with the first driving assembly, the guide rod being fixed to the first support frame and extending along the optical axis direction of the lens module, the guide rod being in sliding connection with the second support frame and guiding the second support frame to move along the optical axis direction of the lens module; a second driving assembly for driving the second support frame to move relative to the bottom plate along a direction perpendicular to the optical axis direction of the lens module, the second driving assembly comprising a second magnetic circuit system and an anti-shake coil arranged in opposite spaced relation with the second magnetic circuit system, the second magnetic circuit system being fixed to one of the bottom plate and the first support frame, and the anti-shake coil being fixed to the other one of the bottom plate and the first support frame.

2. The lens driving device according to claim 1, wherein The first driving assembly and the guide rod each comprise one, the first driving assembly and the guide rod each being located at one of the diagonal positions of the first support frame; the second driving assembly comprises two groups, the two groups of the second driving assembly each being located at the other diagonal position of the first support frame, and each group of the second driving assembly comprising two second driving assemblies each located at an adjacent side of the first support frame.

3. The lens driving apparatus according to claim 1, wherein The first support comprises a first side, a second side, a third side and a fourth side connected in sequence; the first driving assembly comprises one, and is located at a corner position formed by the first side and the second side; the guide rod comprises a first guide rod, a second guide rod and a third guide rod, the first guide rod is located at a corner position formed by the second side and the third side, the second guide rod is located at a corner position formed by the third side and the fourth side, and the third guide rod is located in the middle of the first side; the second driving assembly comprises two, and the two second driving assemblies are respectively located at the third side and the fourth side.

4. The lens driving apparatus according to claim 1, wherein The first driving assembly and the guide rod each comprise two, the two first driving assemblies are respectively located at one set of corner positions of the first support, and the two guide rods are respectively located at another set of corner positions of the first support; the second driving assembly comprises two, and the two second driving assemblies are respectively located at adjacent two sides of the first support.

5. The lens driving apparatus according to claim 1, wherein The first driving assembly and the guide rod each comprise two, the two first driving assemblies are respectively located at one set of diagonal positions of the first support, and the two guide rods are respectively located in the middle of the opposite two sides of the first support; the second driving assembly comprises two, and the two second driving assemblies are respectively located at another set of diagonal positions of the first support.

6. The lens driving apparatus according to claim 1, wherein The magnetic bowl comprises a bowl bottom and a side wall extended from the circumferential side of the bowl bottom, and two notches are formed in the side wall; the magnetic steel assembly comprises a first driving magnetic steel fixed on the bowl bottom, a 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 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 pole core.

7. The lens driving apparatus of claim 1, wherein The side of the first support close to the bottom plate is provided with a support portion extending inward and spaced from the bottom plate, the side of the first support away from the bottom plate is fixed with a support plate opposite to the support portion, the position of the second support close to the support portion is provided with an extension portion extending outward, and the extension portion is provided with a through hole penetrating therethrough; one end of the guide rod is fixed to the support plate, the other end of the guide rod penetrates through the through hole and extends to the support portion, the guide rod and the through hole form a sliding connection, and the guide rod penetrates through the support portion and forms a fixed connection with the support portion.

8. The lens driving apparatus of claim 1, wherein The second magnetic circuit system comprises a lower clamping plate fixed to the bottom plate, a first anti-shake magnetic steel, a second anti-shake magnetic steel and a third anti-shake magnetic steel fixed in sequence along the direction perpendicular to the optical axis of the lens module and arranged on the lower clamping plate, 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.

9. The lens driving apparatus of claim 1, wherein The lens driving device further comprises a first elastic member, and the first elastic member is connected with the first support and the bottom plate respectively and elastically supports the first support on the bottom plate.

10. The lens driving apparatus of claim 1, wherein The lens driving device further comprises a second elastic member and a third elastic member which are spaced from each other, the second elastic member is connected to the side of the first support away from the bottom plate and the side of the second support away from the bottom plate respectively, and the third elastic member is connected to the side of the first support close to the bottom plate and the side of the second support close to the bottom plate respectively.

Images