Lens driving device and camera module

Abstract

The invention relates to the technical field of optical anti-shake, in particular to a lens driving device and a camera module, the lens driving device comprises a base, an AF movable part and a lens holder, the AF movable part is movably arranged on the base, the lens holder is movably arranged on the AF movable part, the AF movable part comprises an AF frame and a plurality of horizontal suspension wires, the AF frame is movably arranged on the base, and the horizontal suspension wires are arranged on the AF frame. One end of each horizontal suspension wire is connected to the AF frame, the other end of each horizontal suspension wire is connected to the base, the lens bearing seat is movably arranged on the AF frame, and the lens driving device is not provided with an elastic sheet; a horizontal suspension wire is used as an AF suspension framework to realize a friction-free design, a first rolling body and two second rolling bodies are used as an OIS guide framework, and the horizontal suspension wire is used as a power supply and a signal line to realize electric connection with a base, so that the whole framework is simplified on the basis of a three-axis closed loop, the manufacturing process is optimized, and the production cost is reduced; and meanwhile, the magnetic leakage phenomenon is reduced, and magnetic interference to the outside is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of optical image stabilization, and particularly relates to a lens driving device and a camera module. Background Art

[0002] Currently, people's demand for the camera function of portable electronic devices (such as tablet computers, smart phones, etc.) is still increasing rapidly. In order to meet people's diverse requirements for the imaging of the camera function, an anti-shake motor is usually added to the camera module to perform motion compensation on the camera module during shooting, so as to achieve the effect of improving the imaging quality.

[0003] At present, most of the conventional anti-shake motors on the market adopt the structure of upper and lower elastic sheets + suspension wires, or the scheme of double-layer ball bearings to achieve the purpose of anti-shake. However, in order to achieve a three-axis closed-loop design for the conventional structure of upper and lower elastic sheets + suspension wires, many additional components need to be added, resulting in a complex overall structure and high manufacturing costs. And due to the double-layer ball bearing structure of the double-layer ball bearings, the overall guiding structure of the OIS requires a large space and cannot be miniaturized. Moreover, there is friction in the ball bearing structure, and additional lubricating oil needs to be added, making the assembly very inconvenient.

[0004] It should be noted that the information disclosed in this background art section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] To solve the defects of the existing anti-shake motors mentioned above, the present invention provides a lens driving device, which includes a base, an AF movable part and a lens holder. The AF movable part is movably arranged on the base, and the lens holder is movably arranged on the AF movable part.

[0006] The AF movable part includes an AF frame and a plurality of horizontal suspension wires. The AF frame is movably arranged on the base. One end of each of the plurality of horizontal suspension wires is connected to the AF frame, and the other end of each of the plurality of horizontal suspension wires is connected to the base. The lens holder is movably arranged on the AF frame.

[0007] Wherein, the lens driving device does not have elastic sheets.

[0008] Further, a magnetic conductive sheet is provided on an outer side wall of one side of the base.

[0009] Further, a first substrate is provided on an outer side wall of one side of the base. A plurality of the horizontal suspension wires are connected to the first substrate. A first coil is provided on a side of the first substrate facing the AF frame, and a first magnet is provided on the AF frame at a position corresponding to the first coil.

[0010] Furthermore, the lens driving device further includes an embedded part and at least two second coils. The embedded part is disposed within the AF frame, and the embedded part is electrically connected to a plurality of the horizontal suspension wires. Two of the second coils are disposed on a side of the AF frame facing the lens holder. The two second coils are electrically connected to the embedded part, and two second magnets are provided on the lens holder at positions corresponding to the two second coils.

[0011] Furthermore, the two second coils are respectively located at two adjacent corners of the AF frame and on a side away from the first substrate.

[0012] Furthermore, the two second coils are obliquely arranged.

[0013] Furthermore, a first rolling groove and at least two second rolling grooves are provided on the AF frame. The first rolling groove is located between the two second coils, and the positions of the two second rolling grooves are opposite to the two second coils. A first rolling body is movably disposed within the first rolling groove, a second rolling body is movably disposed within the second rolling groove, and the first rolling body and the second rolling body are movably connected to the lens holder.

[0014] Furthermore, the second rolling body is a roller.

[0015] Furthermore, the lens driving device further includes a damping cover plate, and the damping cover plate is connected to the AF frame. A plurality of damping grooves are provided on the lens holder, a plurality of damping parts are provided on the damping cover plate, and the plurality of damping parts respectively extend into the plurality of damping grooves, and the damping parts are movably connected to the damping grooves.

[0016] Furthermore, the present invention further provides an imaging module using the lens driving device according to any one of the above.

[0017] Based on the above, for the lens driving device and the imaging module provided by the present invention, compared with the prior art, a horizontal suspension wire is used as the AF suspension structure to achieve a frictionless design, and a first rolling body and two second rolling bodies are used as the OIS guiding structure, and the horizontal suspension wire is used as a power supply and signal line to be electrically connected to the base, realizing the simplification of the overall structure on the basis of a three-axis closed loop, optimizing the manufacturing process and production cost, while reducing the magnetic leakage phenomenon and avoiding magnetic interference to the outside. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the following description of the positional relationship of the drawings, unless otherwise specified, it is based on the direction in which the components are shown in the drawings.

[0019] Figure 1 Exploded structural schematic diagram of a lens driving device provided by an embodiment of the present invention; Figure 2 Exploded structural schematic diagram of a base provided by an embodiment of the present invention; Figure 3 Structural schematic diagram of a base and an AF frame provided by an embodiment of the present invention; Figure 4 Exploded structural schematic diagram of an AF frame and a lens holder provided by an embodiment of the present invention; Figure 5 Structural schematic diagram of the connection between a horizontal suspension wire and a buried part provided by an embodiment of the present invention.

[0020] Reference numerals: Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. Additionally, the term "comprising" and any of its variations mean "at least including".

[0023] Please refer to Figure 1 and Figure 2 , Figure 1 , which is an exploded structural schematic diagram of a lens driving device provided by an embodiment of the present invention; Figure 2 , which is an exploded structural schematic diagram of a base provided by an embodiment of the present invention.

[0024] To solve the defects of the above traditional anti-shake motors, or to achieve at least one of the advantages or other advantages, an embodiment of the present invention provides a lens driving device. As shown in the figure, the lens driving device includes a base 10, an AF movable part 20, and a lens holder 30.

[0025] A first substrate 11 is provided on an outer side wall of one side of the base 10. The first substrate 11 is internally provided with power supply and signal lines to realize the extraction of power supply and signals of the overall motor.

[0026] As Figure 3 shown, the AF movable part 20 is movably provided on the base 10. Specifically, in implementation, the AF movable part 20 includes an AF frame 21 and a plurality of horizontal suspension wires 22. The AF frame 21 is movably provided on the base 10. One end of each of the plurality of horizontal suspension wires 22 is connected to the AF frame 21, and the other end of each of the plurality of horizontal suspension wires 22 is connected to the base 10.

[0027] Specifically, the number of the horizontal suspension wires 22 is 4. The 4 horizontal suspension wires 22 are respectively arranged in a vertically spaced and parallel manner in two pairs on opposite sides of the AF frame 21. One end of the 4 horizontal suspension wires 22 is connected to the AF frame 21, and the other end is perpendicularly connected to the first substrate 11, serving as a suspension structure of the AF frame 21, enabling the AF frame 21 to move smoothly and stably relative to the base 10 along the Z-axis direction to achieve focusing.

[0028] Further, a first coil 40 is disposed on one side of the first substrate 11 facing the AF frame 21. A first magnet 23 is provided at a position corresponding to the first coil 40 on the AF frame 21. When the first coil 40 generates an Ampere force under the magnetic field of the first magnet 23 to perform a cutting magnetic induction line movement, the AF frame 21 is further pushed to perform movement compensation in the Z-axis direction, achieving the purposes of focusing and anti-shake.

[0029] Preferably, a driving first driving IC 12 is further disposed on the first substrate 11 for monitoring and controlling the Z-axis movement of the AF frame 21.

[0030] Since the AF movable part 20 adopts a suspension structure of 4 horizontal suspension wires 22 to achieve a frictionless design, when the AF frame 21 moves in the Z-axis direction, the upper and lower horizontal suspension wires 22 may cause the problem that the AF frame 21 tilts due to uneven force. Therefore, a magnetic conductive sheet 50 is disposed on the side of the first substrate 11 away from the AF frame 21. A magnetic suction force is generated at the position between the magnetic conductive sheet 50 and the first magnet 23 to ensure the stability of the AF frame 21, avoid problems of tilting or toppling, and improve the imaging quality.

[0031] Please combine Figure 1 Refer to Figure 4 and Figure 5 , the lens holder 30 is movably disposed on the AF frame 21. Specifically, the lens driving device further includes a buried part 60 and at least two second coils 70. The buried part 60 is pre-buried inside the AF frame 21 and is electrically connected to the 4 horizontal suspension wires 22. The two second coils 70 are disposed on the side of the AF frame 21 facing the lens holder 30 in mutually perpendicular directions and are electrically connected to the buried part 60. The 4 horizontal suspension wires 22 are used to lead out the power supply and signal lines, eliminating traditional components such as elastic pieces + suspension wires. This can not only avoid errors caused by the deformation of the elastic pieces, but also simplify the complexity of the structure and the difficulty of the manufacturing process, facilitating assembly and reducing production costs.

[0032] Second magnets 31 are provided at positions corresponding to the two second coils 70 on the lens holder 30. When the second coils 70 are energized, an Ampere force is generated under the magnetic field of the second magnets 31 to perform a cutting magnetic field line movement, and then the lens holder 30 is pushed to perform movement compensation in the X-axis direction and / or the Y-axis direction, achieving the purposes of anti-shake and improving the imaging quality.

[0033] Preferably, a second driving IC 80 and a third driving IC 90 are respectively disposed inside the two second coils 70 for monitoring and controlling the X-axis movement and the Y-axis movement of the lens holder 30 respectively.

[0034] In some preferred embodiments, the two second coils 70 are respectively located at two adjacent corners of the AF frame 21 and on the side away from the first substrate 11. That is, the installation positions of the two second coils 70 and the installation position of the first magnet 23 are on two opposite sides of the AF frame 21. By concentrating the installation positions of the two second coils 70 and the two second magnets 31 and the installation positions of the first coil 40 and the first magnet 23 on the same side of the base 10, the magnetic leakage phenomenon of the overall anti-shake motor is reduced, and more lenses and anti-shake motors can be arranged.

[0035] Furthermore, the two second coils 70 are obliquely arranged. Preferably, the inclination angle is 45°.

[0036] On the basis of the above, the AF frame 21 is provided with a first rolling groove 24 and at least two second rolling grooves 25. The installation position of the first rolling groove 24 is between the two second coils 70. A first rolling body 100 is movably arranged in the first rolling groove 24. A third rolling groove 32 is provided at the position corresponding to the first rolling groove 24 on the lens holder 30. The first rolling body 100 is movably connected to the third rolling groove 32.

[0037] The installation positions of the two second rolling grooves 25 are opposite to the two second coils 70 and are respectively responsible for the X-axis direction and the Y-axis direction. Second rolling bodies 110 are respectively movably arranged in the two second rolling grooves 25. A fourth rolling groove 33 is provided at the position corresponding to the two second rolling grooves 25 on the lens holder 30. The second rolling bodies 110 are movably connected to the fourth rolling grooves 33.

[0038] When the lens holder 30 performs motion compensation relative to the AF frame 21 in the X-axis direction and / or the Y-axis direction, the first rolling body 100 and the second rolling bodies 110 respectively form rolling connections with the lens holder 30, so that the lens holder 30 can perform motion compensation smoothly and evenly in the X-axis direction and / or the Y-axis direction, achieving the purpose of improving the imaging quality.

[0039] Preferably, the second rolling groove 25 is an inverted trapezoidal groove, and the fourth rolling groove 33 is a V-shaped groove Furthermore, the second rolling body 110 is a roller. Compared with a ball or other rolling bodies, the roller has a larger supporting surface, can reduce the pressure, and avoid the problem of pits causing jitter or vibration of the lens holder 30. Of course, it can be understood that due to the use of rollers, in order for the lens holder 30 to perform normal motion compensation, the length L of the second rolling groove 25 and the fourth rolling groove 33 should be slightly greater than the length l of the roller to avoid interference between the second rolling body 110 and the second rolling groove 25 and the fourth rolling groove 33.

[0040] In some preferred embodiments, the lens driving device further includes a shielding cover 120 and a damping cover plate 130. Specifically, during implementation, the shielding cover 120 and the base 10 are covered with each other. The damping cover plate 130 is disposed between the lens holder 30 and the shielding cover 120. The damping cover plate 130 is connected to the AF frame 21.

[0041] A plurality of damping grooves 34 are provided on the lens holder 30. A plurality of damping portions 131 are provided on the damping cover plate 130. The plurality of damping portions 131 respectively extend into the plurality of damping grooves 34 and are movably connected to the damping grooves 34. When the lens holder 30 performs motion compensation in the X-axis direction and / or the Y-axis direction, a damping force can be provided.

[0042] In some preferred embodiments, the present invention further provides an imaging module that employs the lens driving device of any one of the above.

[0043] In summary, the lens driving device and the imaging module provided by the present invention, compared with the prior art, adopt a horizontal suspension wire as the AF suspension structure to achieve a frictionless design, and use a first rolling body and two second rolling bodies as the OIS guiding structure, and utilize the horizontal suspension wire as the power supply and signal line to achieve electrical connection with the base, simplifying the overall structure on the basis of a three-axis closed loop, optimizing the manufacturing process and production cost, while reducing the magnetic leakage phenomenon and avoiding magnetic interference to the outside.

[0044] Although terms such as horizontal suspension wire are used more in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0045] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved only in one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or the background art at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation to the claim.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lens driving device, characterized in that: include Base; An AF movable part, wherein the AF movable part is movably arranged on the base; A lens holder, the lens holder being movably disposed on the AF movable part; The AF movable part comprises an AF frame and a plurality of horizontal suspension wires, the AF frame is movably arranged on the base, one end of the plurality of horizontal suspension wires is connected to the AF frame, the other end of the plurality of horizontal suspension wires is connected to the base, and the lens holder is movably arranged on the AF frame; Wherein, the lens driving device does not have a spring.

2. The lens driving device according to claim 1, characterized in that: A magnetic conductive sheet is arranged on an outer side wall of one side of the base.

3. The lens driving device according to claim 1, characterized in that: A first substrate is arranged on an outer side wall of one side of the base, a plurality of the horizontal suspension wires are connected to the first substrate, a first coil is arranged on a side of the first substrate facing the AF frame, and a first magnet is arranged on the AF frame at a position corresponding to the first coil.

4. The lens driving device according to claim 1, wherein: The lens driving device also includes an embedded component and at least two second coils, wherein the embedded component is arranged in the AF frame, the embedded component is electrically connected to a plurality of the horizontal suspension wires, two second coils are arranged on a side of the AF frame facing the lens mount, the two second coils are electrically connected to the embedded component, and two second magnets are provided on the lens mount at positions corresponding to the two second coils.

5. The lens driving device according to claim 4, characterized in that: The two second coils are respectively located at two adjacent corners of the AF frame and at a side away from the first substrate.

6. The lens driving device according to claim 5, characterized in that: The two second coils are arranged obliquely.

7. The lens driving device according to claim 4, characterized in that: The AF frame is provided with a first rolling groove and at least two second rolling grooves, the first rolling groove is located between the two second coils, and the two second rolling grooves are arranged at positions opposite to the two second coils; A first rolling body is movably arranged in the first rolling groove, a second rolling body is movably arranged in the second rolling groove, and the first rolling body and the second rolling body are movably connected to the lens holder.

8. The lens driving device according to claim 7, characterized in that: The second rolling element is a roller.

9. The lens driving device according to claim 1, characterized in that: The lens driving device further comprises a damping cover plate, wherein the damping cover plate is connected to the AF frame; The lens holder is provided with a plurality of damping grooves, the damping cover is provided with a plurality of damping parts, the plurality of damping parts respectively extend into the plurality of damping grooves, and the damping parts are movably connected with the damping grooves.

10. A camera module, characterized in that: A lens driving device as described in any one of claims 1 to 9 is adopted.

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