Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier, a first capacitor and an elastic piece, the frame is annular and is connected with the base in a rolling manner, and the frame is provided with a guide post extending along the vertical direction. The carrier can be movably installed in the frame in the vertical direction and is connected with the guide columns in a rolling mode. The first capacitor comprises a first electrode plate and a first induction plate, the first electrode plate and the first induction plate are oppositely arranged, one of the first electrode plate and the first induction plate is connected with the frame, and the other one of the first electrode plate and the first induction plate is connected with the carrier. The elastic piece is connected with the frame and the carrier and used for driving the carrier to reset.

Description

Technical Field

[0001] This utility model relates to the field of optical element technology, and in particular to a lens driving mechanism. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones) have the function of taking pictures or recording videos. Through the camera module set on the electronic device, users can operate the electronic device to extract all kinds of photos.

[0003] The design of modern electronic devices is constantly trending towards miniaturization, necessitating the continuous reduction in the size and structure of various components in camera modules to achieve this goal. Generally, the drive mechanism in a camera module may include a lens mount to support a lens, and the drive mechanism may have autofocus or optical image stabilization functions. However, while existing drive mechanisms can achieve the aforementioned photographic or video recording functions, they still cannot meet all requirements.

[0004] In some lens drive mechanisms, the carrier needs to have a large motion stroke and also needs to accurately sense the position of the carrier. However, existing lens drive mechanisms cannot meet this requirement, so improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a lens driving mechanism to solve the problems of the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides a lens driving mechanism, comprising:

[0007] Base;

[0008] A frame, which is ring-shaped and rotatably connected to the base, is provided with guide posts extending in a vertical direction;

[0009] A carrier, which is movably mounted within the frame in a vertical direction and is rotatably connected to the guide column;

[0010] A first capacitor, comprising a first electrode plate and a first sensing plate, wherein the first electrode plate and the first sensing plate are disposed opposite to each other and one of them is connected to the frame and the other is connected to the carrier;

[0011] An elastic element, which is connected to the frame and the carrier, is used to drive the carrier to reset.

[0012] In one embodiment, the top surface of the frame is provided with a receiving groove;

[0013] One of the first electrode plate or the first sensing plate is disposed on the side wall of the receiving groove, and the other is connected to the radial outer side of the carrier and located inside the receiving groove.

[0014] In one embodiment, the receiving slot is disposed on one side of the frame;

[0015] The two guide posts are located on the other side of the frame;

[0016] The lens driving mechanism also includes:

[0017] Z-axis coil assembly, the Z-axis coil assembly being connected to one of the frame and the carrier and located between the two guide posts;

[0018] Z-axis magnet assembly, which is connected to another of the frame and the carrier, and cooperates with the Z-axis coil assembly to drive the carrier to move in the vertical direction.

[0019] In one embodiment, the carrier includes a carrier metal frame connected to the first electrode plate or the first sensing plate, and extending at least to adjacent sides of the carrier.

[0020] In one embodiment, the lens driving mechanism further includes:

[0021] The second capacitor includes a second electrode plate and a second sensing plate. The second electrode plate is connected to the frame, and the second sensing plate is connected to the base.

[0022] The third capacitor includes a third electrode plate and a third sensing plate. The third electrode plate is connected to the frame, and the third sensing plate is connected to the base.

[0023] In one embodiment, the first sensing plate is connected to the frame;

[0024] A metal frame is installed inside the frame, and the metal frame is electrically connected to the first sensing plate, the second electrode plate, and the third electrode plate.

[0025] In one embodiment, the Z-axis coil assembly is connected to the carrier;

[0026] The carrier is further provided with a first adsorption plate, which is attached to the Z-axis coil group to adsorb the Z-axis coil group.

[0027] In one embodiment, the lens driving mechanism further includes:

[0028] The X-axis coil assembly is connected to the base.

[0029] The X-axis magnet assembly is connected to the frame and cooperates with the X-axis coil assembly to drive the frame to move along the X-axis direction;

[0030] The Y-axis coil assembly is connected to the base.

[0031] The Y-axis magnet assembly is connected to the frame and cooperates with the Y-axis coil assembly to drive the frame to move along the Y-axis direction.

[0032] In one embodiment, the base includes:

[0033] The base plate is rectangular and includes a first side and a second side arranged adjacent to each other, the width of the first side being greater than the width of the second side; the two first sides are respectively provided with a second adsorption plate and a third adsorption plate;

[0034] A circuit board, which is stacked on the top surface of the base plate;

[0035] The frame and the base plate are rotatably connected.

[0036] The X-axis coil group and the Y-axis coil group are located inside the circuit board and above the second adsorption plate and the third adsorption plate, respectively.

[0037] In one embodiment, the elastic element is electrically connected to the carrier metal frame and the frame metal frame;

[0038] The base also includes:

[0039] Four support columns are respectively connected to the four corners of the base plate;

[0040] The built-in circuit is located inside the base plate, with a portion of the connecting end extending to the top surface of the support column and electrically connected to the elastic element. At least a portion of the connecting end is located inside the second side and electrically connected to the circuit board. Attached Figure Description

[0041] Figure 1 and Figure 2 This is an exploded view of the lens driving mechanism according to one embodiment of the present invention.

[0042] Figure 3 yes Figure 1 Assembly diagram of the lens drive mechanism in the illustrated embodiment.

[0043] Figure 4 yes Figure 3 A cross-sectional view of the lens drive mechanism along line AA in the embodiment shown.

[0044] Figure 5 yes Figure 1 An exploded view of the lens drive mechanism in the illustrated embodiment.

[0045] Figure 6 yes Figure 1 The illustrated embodiment shows a perspective view of the base without the circuit board.

[0046] Figure 7 This is an assembly diagram of the built-in circuit, the second adsorption plate, and the third adsorption plate in one embodiment of this utility model.

[0047] Figure 8 yes Figure 1 A perspective view of the base in the illustrated embodiment.

[0048] Figure 9 yes Figure 1 A perspective view of the circuit board in the illustrated embodiment.

[0049] Figure 10 and Figure 11 yes Figure 1 Assembly diagram of the frame and carrier in the illustrated embodiment.

[0050] Figure 12 and Figure 13 yes Figure 10 Exploded view of the frame and carrier in the illustrated embodiment.

[0051] Figure 14 yes Figure 10 An exploded view of the frame in the illustrated embodiment.

[0052] Figure 15 and Figure 16 yes Figure 10 The assembly diagram shown in the embodiment comprises a metal plate, a metal frame, an X-axis magnet group, a Y-axis magnet group, a Z-axis magnet group, a Z-coil group, and a first adsorption plate.

[0053] Reference numerals: 100, Lens drive mechanism; 1, Base; 11, Base plate; 111, First side; 112, Second side; 12, Support column; 13, Boss; 131, Ball bearing; 14, Circuit board; 141, X-axis coil group; 142, Y-axis coil group; 15, Built-in circuit; 151, First connecting end; 152, Second connecting end; 16, Second suction plate; 17, Third suction plate; 18, Chip; 2, Frame; 21, Frame metal frame 22. X-axis magnet group; 23. Y-axis magnet group; 24. Z-axis magnet group; 25. Metal plate; 251. Hollowed-out area; 26. Receiving groove; 27. First sensing plate; 28. Second electrode plate; 29. ​​Third electrode plate; 3. Carrier; 31. Z-axis coil group; 32. Guide post; 34. First electrode plate; 35. Carrier metal frame; 36. First adsorption plate; 4. Upper spring; 41. Spring; 42. Metal ring; 5. Lower spring; 6. Outer shell; Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0055] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0056] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of this utility model. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of this utility model, but are merely illustrative of the essential spirit of the technical solution of this utility model.

[0057] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0058] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0059] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0060] This utility model relates to a lens driving mechanism 100, which includes a base 1, a frame 2, a carrier 3, an elastic element, a first capacitor, a second capacitor, a third capacitor, and a housing 6. The base 1 includes a base plate 11, built-in circuitry 15, four support columns 12, four protrusions 13 located on the top surface of the base plate 11, an X-axis coil group 141, a Y-axis coil group 142, and a circuit board 14.

[0061] The base plate 11 is rectangular and has four sides. Two opposite sides are defined as the first side 111, and the other two opposite sides are defined as the second side 112. The width of the first side 111 is greater than the width of the second side 112. The wider first side 111 is used to support the circuit board 14, while the narrower second side 112 is used to avoid other components that are adapted to the lens drive mechanism 100.

[0062] Four bosses 13 are located at the four corners of the base plate 11, and each has a mounting groove on its top surface. Each mounting groove contains a ball bearing 131, which supports the rolling of the frame 2. It should be understood that at least one ball bearing 131 is provided in each mounting groove to form a stable structure to stably support the frame 2.

[0063] The four support columns 12 are of equal height and are respectively connected to the four corners of the base plate 11.

[0064] Built-in wiring 15 is installed within the base plate 11, and a portion of the connection end of built-in wiring 15 extends into the support column 12 for electrical connection with the elastic element; this portion of the connection end is defined as the first connection end 151. Another portion of the connection end is located inside one of the second sides 112 for electrical connection with the circuit board; this portion of the connection end is defined as the second connection end 152.

[0065] The circuit board 14 is C-shaped and stacked on the top surface of the base plate 11. Specifically, the circuit board 14 is located on the top surface of the two first sides 111 and one of the second sides 112, which is the side where the second connection terminal 152 is provided. The circuit board 14 is electrically connected to the second connection terminal 152.

[0066] Two sensors are connected to circuit board 14 to sense the position of frame 2 along the X-axis or Y-axis.

[0067] The X-axis coil group 141 and the Y-axis coil group 142 are located on the circuit board 14 and above the two second sides 112, respectively.

[0068] The frame 2 is located on the top surface of the base plate 11 and is rotatably connected to the base plate 11 via the ball bearings 131 in the boss 13.

[0069] Frame 2 is a rectangular ring and includes a frame metal frame 21, an X-axis magnet group 22, a Y-axis magnet group 23, a Z-axis magnet group 24, and multiple metal plates 25. The X-axis magnet group 22, Y-axis magnet group 23, and Z-axis magnet group 24 are located on three adjacent sides of frame 2, while the other side is used to mount the electrode plates or induction plates of the built-in metal frame, the first capacitor, the second capacitor, and the third capacitor. The X-axis magnet group 22 cooperates with the X-axis coil group 141 of the base 1 to drive frame 2 to move along the X-axis direction, while the Y-axis magnet group 23 cooperates with the Y-axis coil group 142 of the base 1 to drive frame 2 to move along the Y-axis direction. The X-axis, Y-axis, and optical axis directions are perpendicular to each other. Frame 2 moves along the X-axis or Y-axis direction to prevent lens image stabilization.

[0070] The two metal plates 25 have L-shaped cross-sections and are attached to the adjacent sides of the X-axis magnet group or the Y-axis magnet group. Specifically, the top surfaces of the two metal plates 25 are located on the top surfaces of the X-axis magnet group and the Y-axis magnet group, respectively, and the sides are attached to the outer surfaces of the X-axis magnet group and the Y-axis magnet group, respectively, for adsorbing the X-axis magnet group and the Y-axis magnet group.

[0071] During the injection molding process, a groove is usually required to hold the X-axis magnet group and the Y-axis magnet group. However, since it is not easy to form a flat plane on the top or bottom wall of the groove, an L-shaped metal plate 25 is embedded in the frame 2. The top surface of the metal plate 25 is the top wall of the groove, and the side surface is the side wall of the groove. This can ensure the flatness of the groove so that it can fit tightly with the X-axis magnet group and the Y-axis magnet group, thereby improving the adsorption force between the metal plate 25 and the X-axis magnet group and the Y-axis magnet group.

[0072] Each L-shaped metal plate 25 has multiple hollow areas 251. The multiple hollow areas 251 are set at the bending corners of the L-shaped metal plate 25 and arranged along the length of the L-shaped metal plate 25 to reduce the stress of the L-shaped metal plate 25 and improve the stability of the metal plate 25.

[0073] Another metal plate 25 is flat and fits against the outer side of the Z-axis magnet assembly 24 for adsorbing the Z-axis magnet assembly 24. The metal plates 25 can be individually insulated or integrally formed. The Z-axis magnet assembly 24 needs to cooperate with the Z-axis coil assembly of the carrier 3. To increase the magnetic field along the vertical direction, the height of the Z-axis magnet assembly 24 can be increased, or two or more magnets can be stacked vertically.

[0074] The first capacitor includes a first electrode plate 34 and a first sensing plate 27. The first electrode plate 34 is disposed outside the carrier 3, while the first sensing plate 27 is disposed on the frame 2. As the carrier 3 moves, the capacitance of the first capacitor changes. The position of the carrier 3 is determined based on the change in the capacitance of the first capacitor.

[0075] In the embodiment shown in the figure, the top surface of the frame 2 is provided with a recessed receiving groove 26, and two first sensing plates 27 are respectively disposed on two opposite sidewalls of the receiving groove 26. The first electrode plate 34 is located radially outside the carrier 3, its top end is connected to the carrier 3, and its top end extends into the receiving groove 26 to form a first capacitor with the two first sensing plates 27.

[0076] It should be understood that in other embodiments, the first electrode plate 34 may be disposed on the frame 2 and the first sensing plate 27 may be disposed on the carrier 3.

[0077] The metal frame and the first sensing plate 27 are located on the same side of the frame 2. The metal frame is electrically connected to the first sensing plate 27 to provide power to the first sensing plate 27.

[0078] The carrier 3 is used to mount the lens. The carrier 3 is movably mounted inside the ring of the frame 2 and is rotatably connected to the frame 2 via guide posts 32. In this embodiment, the carrier 3 has a large stroke along the optical axis. The guide posts 32 can increase the stability of the carrier 3's movement. Moreover, compared to the suspension wire, the four support posts 12 of the base 1 can also improve the stability of the frame 2, ensuring that the carrier 3 can operate stably under a large stroke.

[0079] The carrier 3 also includes a carrier metal frame 35, which is electrically connected to the first electrode plate 34 to charge the first electrode plate 34. The carrier metal frame 35 is bent and occupies at least two adjacent sides of the carrier 3 to increase its stability.

[0080] A Z-axis coil assembly 31 is mounted radially outward on the carrier 3. This Z-axis coil assembly 31 is aligned with and cooperates with the Z-axis magnet assembly 24 to drive the carrier 3 to move along the optical axis, which is the vertical direction. It should be understood that in other embodiments, the Z-axis coil assembly 31 may also be disposed on the frame 2, while the Z-axis magnet assembly 24 may be disposed on the carrier 3.

[0081] The carrier 3 is also provided with a first adsorption plate 36, which is also a metal plate 25 and is attached to the side of the Z-axis coil group to adsorb the Z-axis coil group in order to ensure the stability of the Z-axis coil group.

[0082] In addition, the carrier 3 has two first guide grooves extending along the optical axis on the side where the Z-axis coil group 31 is installed, and the frame 2 has a second guide groove on the radial inner side. The two second guide grooves and the two first guide grooves are aligned and form a space for installing the guide post 32.

[0083] In other words, the two guide posts 32 are respectively installed in the space formed by the matching of the two second guide grooves and the two first guide grooves. The guide posts 32 extend vertically and can be rolled in this space. When the carrier 3 moves along the optical axis, it will touch the guide posts 32, generating rolling friction with the guide posts 32, reducing friction, and also preventing the carrier 3 from tilting, thus playing a guiding role.

[0084] The second capacitor includes a second electrode plate 28 and a second sensing plate. The second electrode plate 28 is located inside the frame 2 and is electrically connected to the frame metal frame 21. The second sensing plate is located inside the circuit board 14 or the base plate 11 and is aligned with the second electrode plate 28 in the vertical direction.

[0085] The third capacitor includes a third electrode plate 29 and a third sensing plate. The third electrode plate 29 is located inside the frame 2 and is also electrically connected to the frame metal frame 21. The third sensing plate is located inside the circuit board 14 or the base plate 11 and is aligned vertically with the third electrode plate 29.

[0086] When frame 2 moves along the X-axis or Y-axis, it will cause the second electrode plate 28 and the third electrode plate 29 to move, thereby changing the capacitance of the second capacitor and the third capacitor, and thus determining the position of frame 2.

[0087] The base plate 11 is provided with a second adsorption plate 16 for adsorbing the X-axis coil group 141 and a third adsorption plate 17 for adsorbing the Y-axis coil group 142. The second adsorption plate 16 and the third adsorption plate 17 are located inside the base plate 11 and below the X-axis coil group 141 and the Y-axis coil group 142, respectively.

[0088] The elastic element includes an upper spring plate 4 and a lower spring plate 5. The upper spring plate 4 and the lower spring plate 5 are located at the top and bottom of the frame 2, respectively, and are elastically connected to the frame 2 and the carrier 3, respectively. After the carrier 3 moves, the upper spring plate 4 and the lower spring plate 5 cooperate to drive the carrier 3 to reset.

[0089] The upper spring plate 4 is also electrically connected to the first connection end 151 of the built-in circuit 15 at the top of the support column 12, and electrically connected to the frame metal frame 21 and the carrier metal frame 35 inside the frame 2. The frame metal frame 21 is electrically connected to the first sensing plate 27, the first electrode plate 34 and the second electrode plate 28, and the carrier metal frame 35 is electrically connected to the Z-axis coil group. After the built-in circuit 15 is energized, it can supply power to the Z-axis coil group, the first sensing plate 27, the first electrode plate 34 and the second electrode plate 28.

[0090] The upper spring 4 includes multiple springs 41 and a metal ring 42 located in the middle of the multiple springs 41. The metal ring 42 is connected to the multiple springs 41. After the whole assembly is installed, the metal ring 42 can be cut off.

[0091] The outer shell 6 covers the frame 2 and the support column 12 and is fixedly connected to the base plate 11, serving a protective function.

[0092] The frame 2 also has a chip 18 installed inside. When powered on, it works in conjunction with the Z-axis magnet group 24 to monitor the movement of the carrier 3 and the lens in the optical axis direction. The chip 18 can also control the current flowing through the Z coil group.

[0093] The carrier and frame are connected by a rolling guide column, which ensures the stability of the carrier's movement even if the carrier has a large stroke. At the same time, the first capacitor is configured to accurately sense the position of the carrier.

[0094] The metal plate inside the frame can ensure the stability of several magnet groups, and the first adsorption plate inside the carrier can also ensure the stability of the Z-axis coil group. Therefore, even if the carrier has a large stroke, the stable operation of the entire lens drive mechanism can be guaranteed.

[0095] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0096] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0097] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism characterized by comprising: include: Base; A frame, which is ring-shaped and rotatably connected to the base, is provided with guide posts extending in a vertical direction; A carrier, which is movably mounted within the frame in a vertical direction and is rotatably connected to the guide column; A first capacitor, comprising a first electrode plate and a first sensing plate, wherein the first electrode plate and the first sensing plate are disposed opposite to each other and one of them is connected to the frame and the other is connected to the carrier; An elastic element, which is connected to the frame and the carrier, is used to drive the carrier to reset.

2. The lens driving mechanism according to claim 1, wherein The top surface of the frame is provided with a receiving groove; One of the first electrode plate or the first sensing plate is disposed on the side wall of the receiving groove, and the other is connected to the radial outer side of the carrier and located inside the receiving groove.

3. The lens driving mechanism according to claim 2, wherein The receiving slot is disposed on one side of the frame; The two guide posts are located on the other side of the frame; The lens driving mechanism also includes: Z-axis coil assembly, the Z-axis coil assembly being connected to one of the frame and the carrier and located between the two guide posts; Z-axis magnet assembly, which is connected to another of the frame and the carrier, and cooperates with the Z-axis coil assembly to drive the carrier to move in the vertical direction.

4. The lens driving mechanism according to claim 1, wherein The carrier is provided with a carrier metal frame, which is connected to the first electrode plate or the first sensing plate and extends at least to the adjacent sides of the carrier.

5. The lens driving mechanism according to claim 4, wherein The lens driving mechanism also includes: The second capacitor includes a second electrode plate and a second sensing plate. The second electrode plate is connected to the frame, and the second sensing plate is connected to the base. The third capacitor includes a third electrode plate and a third sensing plate. The third electrode plate is connected to the frame, and the third sensing plate is connected to the base.

6. The lens driving mechanism according to claim 5, wherein The first sensing plate is connected to the frame; A metal frame is installed inside the frame, and the metal frame is electrically connected to the first sensing plate, the second electrode plate, and the third electrode plate.

7. The lens driving mechanism according to claim 3, characterized in that, The Z-axis coil assembly is connected to the carrier; The carrier is further provided with a first adsorption plate, which is attached to the Z-axis coil group to adsorb the Z-axis coil group.

8. The lens driving mechanism according to claim 1, wherein The lens driving mechanism also includes: The X-axis coil assembly is connected to the base. The X-axis magnet assembly is connected to the frame and cooperates with the X-axis coil assembly to drive the frame to move along the X-axis direction; The Y-axis coil assembly is connected to the base. The Y-axis magnet assembly is connected to the frame and cooperates with the Y-axis coil assembly to drive the frame to move along the Y-axis direction.

9. The lens driving mechanism according to claim 8, wherein The base includes: The base plate is rectangular and includes a first side and a second side arranged adjacent to each other, the width of the first side being greater than the width of the second side; the two first sides are respectively provided with a second adsorption plate and a third adsorption plate; A circuit board, which is stacked on the top surface of the base plate; The frame and the base plate are rotatably connected. The X-axis coil group and the Y-axis coil group are located inside the circuit board and above the second adsorption plate and the third adsorption plate, respectively.

10. The lens driving mechanism according to claim 9, wherein The elastic element is electrically connected to the carrier metal frame and the frame metal frame; The base also includes: Four support columns are respectively connected to the four corners of the base plate; The built-in circuit is located inside the base plate, with a portion of the connecting end extending to the top surface of the support column and electrically connected to the elastic element. At least a portion of the connecting end is located inside the second side and electrically connected to the circuit board.

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