Lens driving device

Abstract

The utility model belongs to the technical field of optical imaging equipment, and particularly relates to a lens driving device, which comprises a base, a carrier, a frame, a circuit board, a driving assembly and a movable seat, and is characterized in that the driving assembly comprises an AF coil, a magnet group and an OIS coil group, and the AF coil and the magnet group are matched to drive the carrier to move in a first direction relative to the frame; the circuit board is provided with an inner ring structure and an outer ring structure, an image sensor is arranged on the inner ring structure, and the base and the frame are fixedly connected with the outer ring structure. The movable seat is fixedly connected with the inner ring structure, the OIS coil group is arranged on the movable seat, and the OIS coil group and the magnet group are matched to drive the movable seat, the inner ring structure and the image sensor to move in the second direction and the third direction relative to the frame. According to the utility model, the zoom operation and the anti-shake operation are independent from each other, a large motion range can be realized, and better focusing and anti-shake effects can be realized.

Description

Technical Field

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

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the function of taking photos or recording videos. These electronic devices are becoming more and more popular and are developing in the direction of convenient and lightweight designs to provide users with more choices.

[0003] Some electronic devices with camera or video functions are equipped with a lens drive device to drive optical components such as lenses to achieve autofocus and optical image stabilization (OIS) functions. Light can pass through the optical components to form an image on the photosensitive component.

[0004] Existing lens drive devices usually include an OIS coil group, a magnet group, an AF coil and a carrier for mounting the lens. However, the range of motion of the carrier is limited and cannot effectively solve the problem of blurry photos caused by shaking during shooting. Utility Model Content

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

[0006] A lens drive device includes a base, a carrier, a frame, a circuit board, and a drive assembly. The drive assembly includes an AF coil disposed on the carrier, a magnet group disposed on the frame, and an OIS coil group. The AF coil cooperates with the magnet group to drive the carrier to move in a first direction relative to the frame.

[0007] The circuit board comprises an inner ring structure and an outer ring structure connected to each other, the inner ring structure is provided with an image sensor, and the base and the frame are respectively fixedly connected to the outer ring structure;

[0008] The lens driving device also includes a movable seat, which is fixedly connected to the inner ring structure. The OIS coil group is arranged on the movable seat. The OIS coil group cooperates with the magnet group to drive the movable seat, the inner ring structure and the image sensor to move in a second direction and a third direction relative to the frame. The second direction and the third direction are respectively perpendicular to the first direction.

[0009] Optionally, the lens driving device further includes a housing, the housing and the base form a hollow cavity, and the carrier, the frame, the driving assembly, the movable seat and part of the circuit board are located in the hollow cavity.

[0010] Optionally, the circuit board is an FPC board, and the inner ring structure and the outer ring structure of the PFC board form an elastic reset plate.

[0011] Optionally, the carrier is sleeved on the inner side of the frame, the upper end of the frame and the upper end of the carrier are connected by an upper spring leaf, and the lower end of the frame and the lower end of the carrier are connected by a lower spring leaf.

[0012] Optionally, the magnets of the magnet group are arranged on the inner side of the frame, the AF coil is arranged on the outer side of the carrier, a frame built-in circuit is arranged in the frame, the bottom end of the frame is fixedly connected to the outer ring structure, and the AF coil is connected to the outer ring structure via the upper spring sheet and the frame built-in circuit respectively.

[0013] Optionally, each magnet of the magnet group is arranged on the inner side of the frame;

[0014] The movable seat is a planar structure, and the OIS coils of the OIS coil group are horizontally arranged around the top of the movable seat, and the magnets are arranged vertically opposite to the corresponding OIS coils.

[0015] Optionally, position sensors are provided around the bottom end of the movable seat, and the position of the movable seat is monitored by the cooperation between the position sensors and the corresponding magnets.

[0016] Optionally, each magnet of the magnet group is arranged on the inner side of the frame;

[0017] The movable seat is a planar structure, and mounting protrusions are arranged around the top of the movable seat. The OIS coils of the OIS coil group are arranged on the inner wall of the mounting protrusions, and the magnets are arranged opposite to the corresponding OIS coils inside and outside.

[0018] Optionally, a position sensor is provided on the inner wall of the mounting protrusion, and the position of the movable seat is monitored by the cooperation between the position sensor and the magnet of the magnet group.

[0019] Optionally, a mounting protrusion avoidance groove is provided on the inner side of the frame, the mounting protrusion avoidance groove is located on the outer side of the magnet, and the mounting protrusion is located in the mounting protrusion avoidance groove.

[0020] Optionally, a movable seat built-in circuit is provided in the movable seat, and the OIS coil and the position sensor are connected to the inner ring structure via the movable seat built-in circuit.

[0021] Optionally, the installation positions of the OIS coils are all offset to one side of the movable seat.

[0022] Optionally, balls are provided at the four end corners of the top end of the movable seat, and the upper ends of the balls abut against the ball grooves at the bottom end of the frame.

[0023] Optionally, connecting protrusions are provided around the bottom end of the movable seat, and the movable seat is fixedly connected to the upper end of the inner ring structure via the connecting protrusions.

[0024] Optionally, a sensor avoidance groove is provided at the bottom end of the movable seat, and the image sensor is located in the sensor avoidance groove.

[0025] Optionally, an IR board is provided in the sensor avoidance groove.

[0026] Beneficial effects: The present invention has at least one or more of the following advantages: The present invention realizes the zoom operation of the lens by moving the carrier in a first direction relative to the frame, and realizes the OIS anti-shake operation of the lens by driving the inner ring of the FPC board and the image sensor to move in the second and third directions relative to the frame through the movable seat. The zoom operation and the anti-shake operation are independent of each other, and a larger range of motion can be achieved, thereby achieving better focusing and anti-shake effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of Example 1 of the present utility model;

[0028] Figure 2 for Figure 1 AA section view;

[0029] Figure 3 for Figure 1 Exploded diagram;

[0030] Figure 4 for Figure 3 Further exploded diagram of

[0031] Figure 5 for Figure 4 Further exploded diagram of

[0032] Figure 6 for Figure 5 Further exploded diagram of

[0033] Figure 7 This is a diagram showing the positional relationship between the frame and the carrier in Example 1 of the present utility model;

[0034] Figure 8 for Figure 7 Exploded diagram;

[0035] Figure 9 This is a diagram showing the positional relationship between the circuit board and the movable seat in Example 1 of the present utility model;

[0036] Figure 10 This is a structural diagram of the movable seat in Example 1 of the present utility model;

[0037] Figure 11 This is a structural diagram of Example 2 of the present utility model;

[0038] Figure 12 for Figure 11 BB cross-sectional view;

[0039] Figure 13 for Figure 11 Exploded diagram;

[0040] Figure 14 for Figure 13 Further exploded diagram of;

[0041] Figure 15 for Figure 14 Further exploded diagram of;

[0042] Figure 16 This is a diagram showing the positional relationship between the frame and the carrier in Example 2 of the present utility model;

[0043] Figure 17 for Figure 16 Exploded diagram;

[0044] Figure 18 This is an exploded view of the base, circuit board and movable seat in Example 2 of the present utility model;

[0045] Figure 19 This is a structural diagram of the movable seat in Example 2 of the utility model. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings to describe in detail the preferred embodiments of the present invention so that the purpose, 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.

[0047] 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.

[0048] 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.

[0049] In the following description, in order to clearly demonstrate 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.

[0050] In the following description, the first direction is defined as the Z-axis, also known as the optical axis; the second direction is defined as the X-axis; and the third direction is defined as the Y-axis. The optical axis represents the direction in which light propagates within an optical element. It is an abstract concept and does not refer to a physical axis.

[0051] Example 1:

[0052] Reference Figures 1 to 10 This embodiment provides a lens driving device, which includes a housing 1, a base 2, a carrier 3, a frame 4, a circuit board 5, a driving component, a movable seat 7 and an image sensor 8.

[0053] The driving assembly includes an AF coil 61 arranged on the carrier 3, a magnet group and an OIS coil group arranged on the frame 4, the magnet group has a plurality of magnets 62, and the OIS coil group has a plurality of OIS coils 63. The number of magnets 62 and OIS coils 63 is preferably the same, and the two are arranged relative to each other.

[0054] The AF coil 61 and the magnet 62 in the magnet group are arranged opposite to each other, and the two cooperate to drive the carrier 3 to move in the Z-axis direction relative to the frame 4. A lens is installed on the carrier 3 to achieve a zoom operation of the lens.

[0055] The circuit board 5 has an inner ring structure 51 and an outer ring structure 52 connected to each other. The image sensor 8 is set at the center of the inner ring structure 51 and is powered by the image sensor 8. The base 2 and the frame 4 are fixedly connected to the outer ring structure 52 respectively.

[0056] The movable seat 7 is fixedly connected to the inner ring structure 51. Several OIS coils 63 from the OIS coil assembly are mounted on the movable seat 7. Each OIS coil 63 in the OIS coil assembly cooperates with a corresponding magnet 62 from the magnet assembly to drive the movable seat 7, the inner ring structure 51, and the image sensor 8 to move in the X- and Y-axis directions relative to the frame 4, thereby achieving OIS (Optically Isolation) for the lens. Due to the elasticity between the inner and outer ring structures 51, 52, a good elastic reset effect is achieved after the movable seat 7, the inner ring structure 51, and the image sensor 8 move in the X- and Y-axis directions relative to the frame 4.

[0057] The housing 1 is an optional structure. A hollow cavity is formed between the housing 1 and the base 2, preferably connected by a snap-fit ​​connection. The carrier 3, frame 4, drive assembly, movable seat 7, and the inner and outer ring structures 51 and 52 of the circuit board 5 are located within the hollow cavity. The portion of the circuit board 5 exposed within the hollow cavity is used for connection to external circuits.

[0058] In one embodiment, the circuit board 5 is an FPC board, and the inner ring structure 51 and the outer ring structure 52 of the PFC board form an elastic reset plate, which can achieve a better elastic reset effect for the movable seat 7.

[0059] In one embodiment, referring to Figure 7 and Figure 8 The carrier 3 is sleeved on the inner side of the frame 4 , the upper end of the frame 4 and the upper end of the carrier 3 are connected by an upper spring 64 , and the lower end of the frame 4 and the lower end of the carrier 3 are connected by a lower spring 65 .

[0060] Specifically, the upper spring leaf 64 can be a split structure, comprising two independent upper spring branches, which are centrally symmetrically arranged with a certain distance between them. Each upper spring branch is separately connected to the carrier 3 and the frame 4. The upper spring branch has a plurality of frame upper connecting portions connected to the frame 4, a plurality of carrier upper connecting portions connected to the carrier 3, and a plurality of upper elastic connecting portions. The upper elastic connecting portions elastically connect the frame upper connecting portions and the carrier upper connecting portions.

[0061] The lower spring leaf 65 adopts an integrated structure, and has several frame lower connecting parts connected to the frame 4, several carrier lower connecting parts connected to the carrier 3, and several lower elastic connecting pieces. The lower elastic connecting pieces elastically connect the frame lower connecting parts and the carrier lower connecting parts.

[0062] In one embodiment, referring to Figure 2 、 Figure 7 and Figure 8 A magnet group 62 is provided on the inner side of the frame 4 . Preferably, the magnet group has four magnets 62 , and the four magnets 62 are provided around the inner side of the frame 4 .

[0063] Reference Figure 2 and Figure 8 An AF coil 61 is disposed on the outside of the carrier 3, facing the magnet 62. Frame 4 contains internal circuitry, with the bottom end of the frame 4 fixedly connected to the outer ring structure 52. The AF coil 61 is connected to the outer ring structure 52 via an upper spring 64 and the internal circuitry of the frame 4. Power is supplied to the AF coil 61 via the outer ring structure 52 of the circuit board 5.

[0064] In one embodiment, referring to Figure 2 、 Figure 7 and Figure 8 , each magnet 62 of the magnet group is arranged on the inner side of the frame 4.

[0065] Reference Figure 5 、 Figure 6 and Figure 9 The movable seat 7 is a planar structure. The top of the movable seat 7 is provided with mounting protrusions 71 around the periphery. The inner wall of the mounting protrusion 71 is provided with each OIS coil 63 of the OIS coil group. Figure 2 Each magnet 62 is disposed opposite to the corresponding OIS coil 63 inside and outside.

[0066] Specifically, the OIS coil assembly includes four OIS coils 63 , and the four OIS coils 63 are respectively disposed on the inner walls of the four mounting protrusions 71 .

[0067] The OIS coil 63 and the AF coil 61 share the magnet 62 .

[0068] The design of the mounting protrusion 71 allows the OIS coil 63 to be placed very close to the outside of the magnet 62, achieving more stable and reliable anti-shake operation.

[0069] In one embodiment, referring to Figure 9 A position sensor 66 is provided on the inner wall of the mounting protrusion 71 , and the moving position of the movable seat 7 is monitored by the cooperation between the position sensor 66 and the magnet 62 of the magnet group.

[0070] In one embodiment, referring to Figure 7 A mounting protrusion avoidance groove 41 is provided on the inner side of the frame 4 , and the mounting protrusion avoidance groove 41 is located outside the magnet 62 . After the movable seat 7 is installed, the mounting protrusion 71 is located in the mounting protrusion avoidance groove 41 .

[0071] In one embodiment, a movable seat internal circuit is provided in the movable seat 7, and the OIS coil 63 and the position sensor 66 are connected to the inner ring structure 51 via the movable seat internal circuit. The OIS coil 63 and the position sensor 66 are powered by the inner ring structure 51 of the circuit board 5.

[0072] In one embodiment, the installation position of the OIS coil 63 is offset to one side of the movable seat 7 .

[0073] Specifically, the four OIS coils 63 located around the movable seat 7 are generally offset in a clockwise or counterclockwise direction, that is, the OIS coils 63 are not arranged in the middle position around the movable seat 7 .

[0074] The mounting positions of the mounting protrusions 71 and the OIS coils 63 are both offset to one side of the movable seat 7, and the four mounting protrusions 71 are offset in a clockwise or counterclockwise direction as a whole, that is, the mounting protrusions 71 are not set in the middle position around the movable seat 7. In this case, the four OIS coils 63 located on the inner walls of the four mounting protrusions 71 can still be offset in a clockwise or counterclockwise direction, or can also be located in the middle position of the mounting protrusions 71. Alternatively, the four mounting protrusions 71 can be located in the middle position around the movable seat 7, and the four OIS coils 63 are offset in a clockwise or counterclockwise direction as a whole, that is, the OIS coils 63 are not set in the middle position of the mounting protrusions 71.

[0075] The biasing design of the four OIS coils 63 allows the movable base 7 to perform both X- and Y-axis translation and Z-axis rotation by controlling the current flowing through them, enhancing the OIS anti-shake effect. For X-axis translation, only two opposing OIS coils 63 need current flowing in the same direction; for Y-axis translation, only the other two opposing OIS coils 63 need current flowing in the same direction; for rotation, both sets of opposing OIS coils need current flowing in opposite directions.

[0076] In one embodiment, referring to Figure 9 Balls 67 are provided at the four corner positions of the top of the movable seat 7 , and the upper ends of the balls 67 abut against the ball grooves 42 at the bottom end of the frame 4 .

[0077] The balls 67 can reduce friction when the movable seat 7 moves.

[0078] In one embodiment, referring to Figure 5 、 Figure 6 and Figure 10 The bottom of the movable seat 7 is provided with connecting protrusions 72 around it, and the movable seat 7 is fixedly connected to the upper end of the inner ring structure 51 around it through the connecting protrusions 72.

[0079] In one embodiment, referring to Figure 10 A sensor avoidance groove 73 is provided at the bottom of the movable seat 7 , and the image sensor 8 is located in the sensor avoidance groove 73 . The sensor avoidance groove 73 is used to avoid the space occupied by the image sensor 8 .

[0080] In one embodiment, referring to Figure 6To ensure effective heat dissipation for image sensor 8, an IR plate 81 is installed within sensor avoidance slot 73. IR plate 81 is located above image sensor 8, with carrier 3 and its lens positioned above IR plate 81. IR plate 81 is a common structure in chip architectures, providing both light transmission and a certain degree of heat dissipation.

[0081] Example 2:

[0082] Reference Figures 11 to 19 Except for the following design, the rest of the design of this embodiment is the same as that of embodiment 1.

[0083] Compared with the first embodiment, the structure of the movable seat 7 of this embodiment is different, and the movable seat 7 is not provided with the mounting protrusion 71:

[0084] Reference Figure 14 、 Figure 15 and Figure 18 The movable seat 7 is a planar structure, and the four OIS coils 63 are horizontally arranged around the top of the movable seat 7. Figure 12 Each magnet 62 is disposed opposite to the corresponding OIS coil 63 in the upper and lower directions.

[0085] Reference Figure 19 Position sensors 66 are provided around the bottom of the movable seat 7 , and the position of the movable seat 7 is monitored by the cooperation of the position sensors 66 and the corresponding magnets 62 .

[0086] The movable seat 7 is not provided with a mounting protrusion 71, so Figure 7 Compared with reference Figure 16 , the inner side of the frame 4 is not provided with a mounting protrusion avoidance groove 41.

[0087] 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 equivalent forms also fall within the scope of the claims appended hereto.

Claims

1. A lens drive device, comprising a base, a carrier, a frame, a circuit board, and a drive assembly, wherein the drive assembly includes an AF coil disposed on the carrier, a magnet assembly disposed on the frame, and an OIS coil assembly, wherein the AF coil and the magnet assembly cooperate to drive the carrier to move in a first direction relative to the frame. It is characterized by: The circuit board comprises an inner ring structure and an outer ring structure connected to each other, the inner ring structure is provided with an image sensor, and the base and the frame are respectively fixedly connected to the outer ring structure; The lens driving device also includes a movable seat, which is fixedly connected to the inner ring structure. The OIS coil group is arranged on the movable seat. The OIS coil group cooperates with the magnet group to drive the movable seat, the inner ring structure and the image sensor to move in a second direction and a third direction relative to the frame. The second direction and the third direction are respectively perpendicular to the first direction.

2. The lens driving device according to claim 1, wherein: The lens driving device further includes a housing, wherein the housing and the base form a hollow cavity, and the carrier, the frame, the driving assembly, the movable seat, and a portion of the circuit board are located in the hollow cavity; And / or, the circuit board adopts an FPC board, and the inner ring structure and the outer ring structure of the FPC board form an elastic reset plate.

3. The lens driving device according to claim 1, wherein: The carrier is sleeved on the inner side of the frame, the upper end of the frame and the upper end of the carrier are connected by an upper spring, and the lower end of the frame and the lower end of the carrier are connected by a lower spring; The magnets of the magnet group are arranged on the inner side of the frame, the AF coil is arranged on the outer side of the carrier, the frame is provided with a frame built-in circuit, the bottom end of the frame is fixedly connected to the outer ring structure, and the AF coil is connected to the outer ring structure via the upper spring sheet and the frame built-in circuit respectively.

4. The lens driving device according to claim 1, wherein: Each magnet of the magnet group is arranged inside the frame; The movable seat is a planar structure, and the OIS coils of the OIS coil group are horizontally arranged around the top of the movable seat, and the magnets are arranged vertically opposite to the corresponding OIS coils.

5. The lens driving device according to claim 4, wherein: Position sensors are arranged around the bottom end of the movable seat, and the position of the movable seat is monitored by the cooperation of the position sensors and the corresponding magnets.

6. The lens driving device according to claim 1, wherein: Each magnet of the magnet group is arranged inside the frame; The movable seat is a planar structure, and mounting protrusions are arranged around the top of the movable seat. The OIS coils of the OIS coil group are arranged on the inner wall of the mounting protrusions, and the magnets are arranged opposite to the corresponding OIS coils inside and outside.

7. The lens driving device according to claim 6, wherein: A position sensor is provided on the inner wall of the mounting protrusion, and the position of the movable seat is monitored by the cooperation between the position sensor and the magnet of the magnet group.

8. The lens driving device according to claim 6, wherein: An installation protrusion avoidance groove is provided on the inner side of the frame, the installation protrusion avoidance groove is located on the outer side of the magnet, and the installation protrusion is located in the installation protrusion avoidance groove.

9. The lens driving device according to claim 5, wherein: A movable seat built-in circuit is provided in the movable seat, and the OIS coil and the position sensor are both connected to the inner ring structure via the movable seat built-in circuit.

10. The lens driving device according to any one of claims 4 to 8, wherein: The installation positions of the OIS coils are all offset to one side of the movable seat.

11. The lens driving device according to any one of claims 1 to 9, wherein: Balls are provided at the four corner positions of the top end of the movable seat, and the upper ends of the balls abut against the ball grooves at the bottom end of the frame; And / or, connecting protrusions are provided around the bottom end of the movable seat, and the movable seat is fixedly connected to the upper end of the inner ring structure around the periphery via the connecting protrusions.

12. The lens driving device according to any one of claims 1 to 9, wherein: A sensor avoidance groove is provided at the bottom end of the movable seat, and the image sensor is located in the sensor avoidance groove.

13. The lens driving device according to claim 12, wherein: An IR board is arranged in the sensor avoidance groove.

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