Base assembly and lens driving device

Abstract

The present invention belongs to the technical field of optical imaging equipment, and specifically relates to a base assembly and a lens driving device. The base assembly includes a base, a reset mechanism and a substrate. The substrate is movably installed in the inner cavity of the base through the reset mechanism. The reset mechanism includes a lower spring leaf, an upper spring leaf and a frame. The lower spring leaf is connected between the base and the frame, and the upper spring leaf is connected between the frame and the substrate. A coil group for cooperating with a magnet group is provided on the substrate. When the coil group is energized, it cooperates with the magnet group to drive the substrate to move at least along a plane perpendicular to the optical axis. The present invention can achieve a wider range of movement, achieve a better zoom and / or anti-shake effect, and thus obtain better imaging quality. The present invention also achieves a better reset effect under the action of the reset mechanism after the substrate moves through the design of the reset mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging equipment, and in particular relates to a base assembly and a lens driving device. Background Art

[0002] With the advancement of technology, many electronic devices today (such as smartphones and digital cameras) now have photo or video recording capabilities. These devices are becoming increasingly common, and are increasingly designed for convenience and slimmer weight, offering users more options. However, current mobile phone cameras sometimes produce blurry images, meaning the images are not clear, or even exhibit ghosting or blurry images. These issues, in addition to occasional loss of focus (i.e., the camera fails to focus properly), are largely due to subtle camera shake during exposure.

[0003] Generally speaking, this slight shaking phenomenon often occurs when holding a camera, causing the camera lens to deviate, resulting in a degradation of the image quality captured by the image sensor. Therefore, the demand for the development of anti-shake technology functions has been relatively high in recent years.

[0004] However, most of the existing technologies achieve optical zoom and optical image stabilization functions through the movement of the same component (carrier). The movement range of the carrier is limited by weight, volume, etc., and cannot effectively solve the problem of blurry photos caused by hand shaking during shooting. Summary of the Invention

[0005] The present invention aims to solve the above technical problems and provides a base assembly and a lens driving device.

[0006] A base assembly, comprising a base, a reset mechanism, and a base plate, wherein the base has an open-topped base cavity, and the base plate is movably mounted in the base cavity via the reset mechanism, wherein the reset mechanism comprises a lower spring, an upper spring, and a frame, wherein the lower spring is connected between the base and the frame, and the upper spring is connected between the frame and the base plate;

[0007] A coil group for cooperating with a magnet group is provided on the substrate. When the coil group is energized, it cooperates with the magnet group to drive the substrate to move at least along a plane perpendicular to the optical axis.

[0008] Optionally, the substrate is located inside the frame, and the upper spring is connected between the top of the frame and the top of the substrate.

[0009] Optionally, the upper spring includes an upper spring outer ring and an upper spring inner ring, both of which are frame-shaped structures. The upper spring inner ring is connected to the inner side of the upper spring outer ring, the upper spring outer ring is connected to the top of the frame, and the upper spring inner ring is connected to the top of the substrate.

[0010] Optionally, the inner sides of two opposite sides of the upper spring outer ring in the first direction are connected to the outer sides of two opposite sides of the upper spring inner ring in the first direction, one or more upper spring through holes are provided on two opposite sides of the upper spring outer ring in the first direction, the bottom ends of two opposite sides of the upper spring outer ring in the second direction are connected to the top end of the frame, and the bottom end of the upper spring inner ring is connected to the outer side of the top end of the base plate;

[0011] The first direction is perpendicular to the optical axis direction, and the second direction is perpendicular to the first direction and the optical axis direction respectively.

[0012] Optionally, support portions are respectively provided on two opposite sides of the inner cavity of the base along a first direction, and the first direction is perpendicular to the optical axis direction;

[0013] The bottom ends of two opposite sides of the lower spring sheet in the first direction are respectively connected to the two support portions.

[0014] Optionally, the lower spring is a rectangular frame structure, the top ends of two opposite sides of the lower spring in the first direction are respectively connected to the bottom end of the frame, one or more lower spring through holes are provided on two opposite sides of the lower spring in the second direction, and frame connecting parts are provided on the inner sides of the two opposite sides of the lower spring in the second direction, and the top ends of the frame connecting parts are connected to the bottom end of the frame;

[0015] The first direction is perpendicular to the optical axis direction, and the second direction is perpendicular to the first direction and the optical axis direction respectively.

[0016] Optionally, the base assembly further includes a circuit board, which is disposed on the base and supplies power to the coil assembly on the substrate.

[0017] Optionally, the circuit board is an FPC board.

[0018] Optionally, the circuit board includes a circuit connection portion, a circuit board outer ring, and a circuit board inner ring connected in sequence, the circuit connection portion is connected to the base outside the inner cavity of the base, the circuit board outer ring is suspended and surrounds the outside of the frame, and the circuit board inner ring is connected to the top of the upper spring at the top of the base;

[0019] The connection portion between the circuit connection portion and the outer ring of the circuit board passes through a base avoidance opening on the base, and the base avoidance opening communicates with the inside and outside of the base inner cavity;

[0020] The connection portion between the top end of the outer ring of the circuit board and the inner ring of the circuit board passes through a frame avoidance groove on the frame, and the frame avoidance groove communicates with the inside and outside of the frame.

[0021] Optionally, the base assembly further includes a movable seat, the movable seat is mounted on the upper end of the substrate, the coil assembly is mounted on the top of the movable seat, and a light avoidance opening is provided in the middle of the movable seat.

[0022] Optionally, the coil group has four coils, and the four coils are arranged around the light avoidance opening.

[0023] Optionally, the movable seat is located above the inner cavity of the base.

[0024] Optionally, a sensor installation opening is provided in the middle of the substrate, and the base assembly further includes an image sensor, which is installed in the sensor installation opening.

[0025] A lens driving device includes the base assembly provided above in the present invention.

[0026] Beneficial effects: The present invention has at least one or more of the following advantages:

[0027] 1. The moving component for realizing the zoom and / or anti-shake function of the present invention is located on the substrate, that is, the chip part. The lens zoom and / or anti-shake effect is achieved through the movement of the chip part. It is relatively independent of the lens part and can achieve a wider range of movement, achieve a better zoom and / or anti-shake effect, and thus obtain better imaging quality.

[0028] The circuit board of the present invention has an outer circuit board ring and an inner circuit board ring, which can not only provide power for the image sensor and the coil assembly, but also, due to this reasonable design, the circuit board has a certain elastic potential energy, which can assist in resetting the substrate.

[0029] 2. The present invention also uses the design of the reset mechanism to achieve a better reset effect after the substrate moves under the action of the reset mechanism.

[0030] 3. The present invention achieves height elevation of the substrate and the image sensor under the action of the reset mechanism, thereby eliminating the need for a substrate movement avoidance opening on the base to avoid movement of the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A structural schematic diagram of the present invention;

[0032] Figure 2 for Figure 1 A top view of

[0033] Figure 3 for Figure 2 AA section view;

[0034] Figure 4 for Figure 1 Exploded diagram;

[0035] Figure 5 for Figure 4 Further exploded diagram of;

[0036] Figure 6 for Figure 4 Schematic diagram of part of the structure;

[0037] Figure 7 An exploded view of the positional relationship between the substrate, the reset mechanism, and the image sensor of the present invention;

[0038] Figure 8 An exploded view of the positional relationship between the substrate and the reset mechanism of the present invention;

[0039] Figure 9 This is an exploded view of the structure of the lens driving device of the present invention. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In the following description, for the sake of convenience, the concept of "optical axis" is introduced to represent the propagation direction of light in an optical element. It is an abstract concept and does not mean that there is an axis in a physical sense.

[0045] Reference Figures 1 to 8 An embodiment of the present invention provides a base assembly 1, which is applied to a lens driving device and can be used as a part of the lens driving device to realize the zoom and / or anti-shake function of the lens.

[0046] The base assembly 1 includes a base 10, a reset mechanism and a base plate 20. The reset mechanism includes a lower spring 30, an upper spring 40 and a frame 50.

[0047] The base 10 has an open-topped inner cavity, a reset mechanism is located within the inner cavity, and the base plate 20 is movably mounted within the inner cavity via the reset mechanism. Specifically, the lower spring 30 is connected between the base 10 and the frame 50, and the upper spring 40 is connected between the frame 50 and the base plate 20.

[0048] The substrate 20 is provided with a coil assembly for cooperating with the magnet assembly, and the coil assembly and the magnet assembly form a driving mechanism. When energized, the coil assembly cooperates with the magnet assembly to drive the substrate 20 to move along the optical axis and / or on a plane perpendicular to the optical axis.

[0049] The coil assembly comprises a plurality of coils 60, and the magnet assembly comprises a plurality of magnets arranged in an opposing relationship to the number of coils 60. When power is applied to a portion of the coils 60, the magnets corresponding to the portion of the coils 60 cooperate with the drive substrate 20 to move along the optical axis. These coils 60 can be defined as zoom coils. When power is applied to another portion of the coils 60, the magnets corresponding to the portion of the coils 60 cooperate with the drive substrate 20 to move along a plane perpendicular to the optical axis. These coils 60 can be defined as anti-shake coils.

[0050] The movement direction perpendicular to the optical axis includes two directions: a first direction perpendicular to the optical axis and a second direction also perpendicular to the first direction. If the first direction is defined as the X-axis direction, the second direction is the Y-axis direction, and the optical axis direction is the Z-axis direction.

[0051] The magnets corresponding to the zoom coil and the anti-shake coil can be the same or different. In other words, the zoom coil and the anti-shake coil can share a set of magnets.

[0052] Of course, in the present invention, when the coil assembly is energized, it cooperates with the magnet assembly to drive the substrate 20 to move only along the optical axis or only along a plane perpendicular to the optical axis.

[0053] With the above-described design, the substrate 20 can move independently of the lens assembly, enabling a wider range of motion, achieving superior zoom and / or anti-shake effects, and thus achieving better imaging quality. Furthermore, the present invention utilizes a reset mechanism to ensure that the substrate 20 is effectively reset after movement.

[0054] The present invention realizes the height elevation of the substrate 20 and the image sensor 90 under the action of the reset mechanism, so that there is no need to set a substrate movement avoidance opening on the base 10 to avoid the movement of the substrate 20. Of course, a substrate movement avoidance opening can also be set, such as Figure 3 As shown, a substrate movement avoidance opening 13 communicating with the inside and outside is provided on the base 10 , and the substrate movement avoidance opening 13 is located below the base plate 20 .

[0055] In one embodiment, the base inner cavity on the base 10 is a rectangular cavity. Specifically, a rectangular frame can be provided on the base 10, and the base inner cavity is formed in the rectangular frame.

[0056] In one embodiment, referring to Figures 3 to 5 The substrate 20 is located inside the frame 50 , and the upper spring 40 is connected between the top of the frame 50 and the top of the substrate 20 .

[0057] In one embodiment, referring to Figures 6 to 8 The upper spring 40 includes an upper spring outer ring 41 and an upper spring inner ring 42, both of which are frame-shaped structures. The upper spring inner ring 42 is connected to the inner side of the upper spring outer ring 41. The upper spring outer ring 41 is connected to the top of the frame 50, and the upper spring inner ring 42 is connected to the top of the substrate 20.

[0058] In one embodiment, referring to Figure 7 The inner sides of the two opposite sides of the upper spring outer ring 41 in the first direction are connected to the outer sides of the two opposite sides of the upper spring inner ring 42 in the first direction. One or more upper spring through holes 411 are provided on both opposite sides of the upper spring outer ring 41 in the first direction. Figure 6 , the bottom ends of the two opposite sides of the upper spring outer ring 41 in the second direction are connected to the top of the frame 50, that is, the bottom ends of the two opposite sides of the upper spring outer ring 41 in the first direction are not connected to the frame 50. Figure 6 and Figure 8 The four bottom surfaces of the bottom end of the upper spring inner ring 42 are all connected to the outer side of the top end of the base plate 20.

[0059] With the above design, this embodiment enables the substrate 20 to achieve relatively stable and smooth movement and a better restoring effect when moving in the first direction.

[0060] In a specific implementation, it is preferred that the inner middle portions of the two opposite sides of the upper spring outer ring 41 in the first direction are connected to the outer middle portions of the two opposite sides of the upper spring inner ring 42 in the first direction.

[0061] In a specific implementation, a circle of substrate accommodating grooves can be provided on the outer side of the top end of the substrate 20 , and the upper spring inner ring 42 is installed in the substrate accommodating grooves.

[0062] In a specific implementation, the length direction of the upper spring through hole 411 is preferably the second direction.

[0063] In one embodiment, referring to Figure 5 Support parts 11 are respectively provided on two opposite sides of the base cavity of the base along the first direction, and the length direction of the support parts 11 is the second direction.

[0064] The lower spring piece 30 is a rectangular frame structure, and the bottom ends of two opposite sides of the lower spring piece 30 in the first direction are respectively connected to the two support portions 11 .

[0065] In one embodiment, referring to Figure 7 and Figure 8 The lower spring leaf 30 is a rectangular frame structure. The top ends of the two opposite sides of the lower spring leaf 30 in the first direction are respectively connected to the bottom end of the frame 50. One or more lower spring through holes 31 are provided on the two opposite sides of the lower spring leaf 30 in the second direction. The inner sides of the two opposite sides of the lower spring leaf 30 in the second direction are provided with frame connecting parts 32. The top ends of the frame connecting parts 32 are connected to the bottom end of the frame 50. That is to say, the two opposite sides of the lower spring leaf 30 in the second direction are not directly connected to the frame 50, but are indirectly connected through the frame connecting parts 32.

[0066] With the above design, in this embodiment, when the substrate 20 moves in the second direction, the frame 50 can drive the substrate 20 to move along the second direction, and the frame 50 can achieve relatively stable and smooth movement and a better resetting effect.

[0067] In a specific implementation, the length direction of the lower spring through hole 31 is preferably the first direction.

[0068] In a specific implementation, frame connecting portions 32 are preferably provided at the inner middle portions of two opposite sides of the lower spring piece 30 in the second direction.

[0069] In one embodiment, referring to Figures 1 to 5 The base assembly 1 further includes a circuit board 70 , which is disposed on the base 10 . The circuit board 70 is mainly used for circuit transmission, and the circuit board 70 supplies power to the coil assembly on the substrate 20 .

[0070] Of course, when the image sensor 90 is mounted on the substrate 20 , the circuit board 70 also supplies power to the image sensor 90 .

[0071] In one embodiment, the circuit board 70 is an FPC board.

[0072] In one embodiment, referring to Figures 1 to 5 The circuit board 70 includes a circuit connection part 71, a circuit board outer ring 72 and a circuit board inner ring 73 connected in sequence. The circuit connection part 71 is connected to the base 10 outside the inner cavity of the base. The circuit board outer ring 72 and the circuit board inner ring 73 are both located in the inner cavity of the base. The circuit board outer ring 72 is suspended around the outside of the frame 50, and the circuit board inner ring 73 is connected to the top of the upper spring 40 at the top of the substrate 20.

[0073] The connection between circuit connector 71 and circuit board outer ring 72 passes through base relief opening 12 on base 10, connecting the inside and outside of the base cavity. The connection between the top of circuit board outer ring 72 and circuit board inner ring 73 passes through frame relief groove 51 on frame 50, connecting the inside and outside of frame 50.

[0074] The circuit board 70, designed as described above, extends from the circuit connection portion 71 outside the base cavity through the base clearance 12, into the base cavity, and connects to the circuit board outer ring 72. The outer ring 72 wraps around the frame 50 and extends through the frame clearance 51 at one end before connecting to the inner circuit board ring 73 at the center. This circuit board 70 not only provides power, but also, due to the coordinated design of the outer and inner circuit boards, 72 and 73, imparts a certain amount of elastic potential energy to the circuit board 70, assisting in the repositioning of the base plate 20.

[0075] In specific implementation, it is preferred that the inner middle portion of the circuit connection portion 71 is connected to the outer middle portion of one side of the circuit board outer ring 72 , and the inner middle portion on the opposite side of the circuit board outer ring 72 is connected to the outer middle portion of one side of the circuit board inner ring 73 .

[0076] In a specific implementation, when a circle of substrate accommodating grooves is provided on the outer side of the top end of the substrate 20 , the upper spring inner ring 42 and the circuit board inner ring 73 are both installed in the substrate accommodating grooves.

[0077] In one embodiment, the circuit board outer ring 72 and the circuit board inner ring 73 both adopt a rectangular frame structure.

[0078] In one embodiment, referring to Figures 1 to 5 The base 10 assembly also includes a movable seat 80, which is mounted on the upper end of the substrate 20, and the coil assembly is mounted on the top of the movable seat 80. A light avoidance opening 81 is provided in the middle of the movable seat 80 so that light can pass through the light avoidance opening 81 and irradiate the image sensor 90 in the substrate 20 below it.

[0079] In the design of this embodiment, when the coil assembly is energized, the magnet assembly matched therewith drives the substrate 20 and the movable seat 80 to move together.

[0080] In one embodiment, the movable seat 80 has a hollow rectangular cross-section.

[0081] In one embodiment, referring to Figure 1 、 Figures 2 to 5 The coil assembly includes four coils 60 , which are arranged around the light avoidance opening.

[0082] In one embodiment, referring to Figure 3 , the movable seat 80 is located above the inner cavity of the base.

[0083] In one embodiment, referring to Figure 7 A sensor mounting opening is provided in the middle of the substrate 20 , and the base assembly 1 further includes an image sensor 90 , which is mounted in the sensor mounting opening.

[0084] In the design of this embodiment, when the coil assembly is energized, the magnet assembly driving substrate 20 and image sensor 90 thereof move together.

[0085] In one embodiment, the substrate 20 is a substrate having a hollow rectangular structure in cross section.

[0086] An embodiment of the present invention further provides a lens driving device, which includes the base assembly 1 provided by the above embodiments of the present invention.

[0087] Example 1:

[0088] Reference Figure 9 The lens driving device of this embodiment includes a base assembly 1, a housing 2, a carrier spring 3, a magnet group having a plurality of magnets 4, a carrier 5 and a zoom coil 6.

[0089] An accommodating cavity is formed between the base assembly 1 and the housing 2 , and the components in the base assembly 1 as well as the carrier spring 3 , the magnet 4 , the carrier 5 , and the zoom coil 6 are all arranged in the accommodating cavity.

[0090] When the base assembly 1 has a circuit board, part of the circuit board extends out of the accommodating cavity for connection with an external device. Specifically, when the circuit board has a circuit connecting portion, the circuit connecting portion extends out of the accommodating cavity.

[0091] The carrier spring 3 is connected between the housing 2 and the carrier 5. The magnet 4 is disposed within the housing 2, and the carrier 5 is located inside the magnet 4 within the housing 2. Typically, the carrier 5 has an optical component mounting hole for mounting an optical component. A zoom coil 6 is disposed on the outer wall of the carrier 5, facing the inner side of the magnet 4. When energized, the zoom coil 6 cooperates with the magnet 4 to drive the carrier 5 along the optical axis, achieving the zoom function.

[0092] The coil assembly of the base assembly 1 is arranged as an anti-shake coil opposite to the bottom end of the magnet 4. When energized, the anti-shake coil cooperates with the magnet 4 to drive the substrate 20 to move in the first direction and the second direction perpendicular to the optical axis, thereby achieving the anti-shake function.

[0093] The base of the base assembly 1 and the housing 2 may be connected to each other, or may be disconnected, or each may be secured separately by other external components. When disconnected, they are preferably secured to each other by an adsorption assembly. Of course, the adsorption assembly may also be omitted, depending on the actual application requirements.

[0094] Of course, when the image sensor 90 is mounted in the middle of the substrate 20 and the carrier 5 is mounted with an optical element, the image sensor 90 is aligned with the optical element to receive light transmitted through the optical element.

[0095] Example 2:

[0096] Compared to Example 1, the lens drive device of this embodiment includes a base assembly 1, a housing, a magnet, and a carrier, but does not include a carrier spring or a zoom coil. Unlike Example 1, the carrier is fixed within the housing, and the coil assembly of the base assembly 1 partially functions as a zoom coil, while the remaining portion functions as an anti-shake coil. The zoom coil and anti-shake coil are respectively positioned opposite the magnet 4 to achieve the zoom and anti-shake functions of the substrate 20.

[0097] The lens driving device of the present invention may also employ other variations, such as a relatively stationary carrier, employing other existing zoom structures to achieve the zoom function, and employing the base assembly 1 to achieve the anti-shake function. Any existing device that can cooperate with the base assembly 1 of the present invention to achieve the zoom and / or anti-shake functions may be combined to form a lens driving device, and is not limited to Embodiments 1 and 2 of the present invention.

[0098] 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 base assembly, characterized in that: The base assembly includes a base, a reset mechanism and a base plate, the base has a base inner cavity with an open top, the base plate is movably installed in the base inner cavity through the reset mechanism, the reset mechanism includes a lower spring leaf, an upper spring leaf and a frame, the lower spring leaf is connected between the base and the frame, and the upper spring leaf is connected between the frame and the base plate; The substrate is provided with a coil group for cooperating with the magnet group. When the coil group is energized, it cooperates with the magnet group to drive the substrate to move at least along a plane perpendicular to the optical axis. The base assembly further includes a circuit board, which is disposed on the base and supplies power to the coil assembly on the substrate; The circuit board comprises a circuit connection part, a circuit board outer ring and a circuit board inner ring which are connected in sequence, the circuit connection part is connected to the base outside the inner cavity of the base, the circuit board outer ring is suspended and surrounds the outside of the frame, and the circuit board inner ring is connected to the top of the upper spring sheet at the top of the base; The upper spring sheet comprises an upper spring sheet outer ring and an upper spring sheet inner ring, both of which are frame-shaped structures. The upper spring sheet inner ring is connected to the inner side of the upper spring sheet outer ring, the upper spring sheet outer ring is connected to the top of the frame, and the upper spring sheet inner ring is connected to the top of the substrate.

2. The base assembly according to claim 1, characterized in that: The base plate is located inside the frame, and the upper spring sheet is connected between the top end of the frame and the top end of the base plate.

3. The base assembly according to claim 1, wherein: Support parts are respectively arranged on two opposite sides of the inner cavity of the base along a first direction, wherein the first direction is perpendicular to the optical axis direction; Two pairs of bottom ends on the lower spring sheet in the first direction are respectively connected to the two support portions.

4. The base assembly according to claim 1, wherein: The upper spring sheet comprises an upper spring sheet outer ring and an upper spring sheet inner ring, both of which are frame-shaped structures. The upper spring sheet inner ring is connected to the inner side of the upper spring sheet outer ring. The inner sides of two opposite sides of the upper spring sheet outer ring in the first direction are connected to the outer sides of two opposite sides of the upper spring sheet inner ring in the first direction. One or more upper spring sheet through holes are arranged on two opposite sides of the upper spring sheet outer ring in the first direction. The bottom ends of two opposite sides of the upper spring sheet outer ring in the second direction are connected to the top of the frame, and the bottom end of the upper spring sheet inner ring is connected to the outer side of the top of the substrate. Wherein, the first direction is perpendicular to the optical axis direction, and the second direction is perpendicular to the first direction and the optical axis direction respectively; And / or, the lower spring sheet is a rectangular frame structure, the top ends of two opposite sides of the lower spring sheet in the first direction are respectively connected to the bottom end of the frame, one or more lower spring sheet through holes are arranged on two opposite sides of the lower spring sheet in the second direction, and frame connecting parts are arranged on the inner sides of the two opposite sides of the lower spring sheet in the second direction, and the top ends of the frame connecting parts are connected to the bottom end of the frame; The first direction is perpendicular to the optical axis direction, and the second direction is perpendicular to the first direction and the optical axis direction respectively.

5. The base assembly according to claim 1, wherein: A sensor installation opening is arranged in the middle of the substrate, and the base assembly further comprises an image sensor, which is installed in the sensor installation opening.

6. The base assembly according to any one of claims 1 to 5, characterized in that: The base assembly also includes a movable seat, which is mounted on the upper end of the base plate, the coil group is mounted on the top of the movable seat, and a light avoidance opening is arranged in the middle of the movable seat.

7. The base assembly according to claim 1, wherein: The circuit board is an FPC board; And / or, the connection portion between the circuit connection portion and the outer ring of the circuit board passes through a base avoidance opening on the base, and the base avoidance opening communicates with the inside and outside of the base inner cavity; The connection portion between the top end of the outer ring of the circuit board and the inner ring of the circuit board passes through a frame avoidance groove on the frame, and the frame avoidance groove communicates with the inside and outside of the frame.

8. The base assembly according to claim 6, wherein: The coil group has four coils, and the four coils are arranged around the light avoidance opening; And / or, the movable seat is located above the inner cavity of the base.

9. A lens driving device, characterized in that: The lens driving device comprises the base assembly according to any one of claims 1 to 8.

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