Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier and an upper reed, and is characterized in that the base comprises a bottom plate and a plurality of mounting cylinders, and the plurality of mounting cylinders are respectively connected to the edge of the top surface of the bottom plate. The frame is connected with the top face of the bottom plate in a rolling mode and located on the inner sides of the multiple installation column bodies. The carrier is connected with the frame and can move in the vertical direction. And the upper reed is connected with the frame and the carrier, and the upper reed is also connected with the top surface of the mounting column body.

Description

Technical Field

[0001] The utility model relates to the technical field of optical element driving, in particular to a lens driving mechanism. 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 recording functions are equipped with a lens driving module to drive an optical component such as a lens to move, thereby achieving the functions of autofocus (AF) and optical image stabilization (OIS). Light can pass through the aforementioned optical component to form an image on a photosensitive component.

[0004] However, in the prior art, it is necessary to use suspension wires to support the frame above the base, but the installation of the suspension wires is not very convenient and the stability is insufficient, which is not conducive to the production and quality assurance of the lens driving mechanism. Utility Model Content

[0005] The utility model aims to provide a lens driving mechanism to solve the problems of the prior art.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a lens driving mechanism, comprising:

[0007] A base, the base comprising a bottom plate and a plurality of mounting columns, wherein the plurality of mounting columns are respectively connected to the top surface edge of the bottom plate;

[0008] A frame, the frame is rollably connected to the top surface of the base plate and is located inside the plurality of mounting columns;

[0009] a carrier connected to the frame and configured to be movable in a vertical direction; and

[0010] An upper spring sheet is connected to the frame and the carrier, and is also connected to the top surface of the mounting column.

[0011] In one embodiment, a built-in circuit is provided in the base, and a connection end of the built-in circuit is located on the top surface of the mounting column and is electrically connected to the upper spring sheet;

[0012] The frame is provided with a magnet group;

[0013] A coil group is provided on the carrier, and the coil group is electrically connected to the upper spring sheet and cooperates with the magnet group to drive the carrier to move in a vertical direction.

[0014] In one embodiment, the bottom plate is in the shape of a rectangular plate;

[0015] The four mounting columns are respectively located at the four corners of the bottom plate and the top surfaces of the mounting columns are flush with the top surface of the frame;

[0016] The frame is a rectangular frame, and four corners of the frame are respectively provided with avoidance grooves for avoiding the four installation columns.

[0017] In one embodiment, the lens driving mechanism further comprises a circuit board, which is stacked on the top surface of the bottom plate and is provided with a bottom coil;

[0018] The magnet group comprises:

[0019] a first group of magnets, the first group of magnets comprising a plurality of Halbach array magnets, the first group of magnets being located above the bottom coil and cooperating with the bottom coil to drive the frame to move in a horizontal direction; and

[0020] A second group of magnets, wherein the second group of magnets cooperates with the coil group to drive the carrier to move in a vertical direction.

[0021] In one embodiment, the second group of magnets includes at least two groups of magnetic strips stacked in a vertical direction, and notches are provided at the top corners of both ends of the magnetic strips located at the top.

[0022] In one embodiment, a first metal frame and a sensing plate electrically connected to the first metal frame are further provided in the frame;

[0023] A second metal frame is also provided inside the carrier, and an electrode plate is also provided outside the carrier. The top end of the electrode plate is connected to the second metal frame, and the bottom end forms a capacitor with the induction plate.

[0024] In one embodiment, a slot is provided on the top surface of the frame, and the induction plate overlaps the inner wall of the slot;

[0025] The electrode plate is located radially outside the carrier and can be inserted into the slot.

[0026] In one embodiment, a protection plate is further provided in the frame, and the protection plate is located outside the sensing plate and is electrically connected to the first metal frame.

[0027] In one embodiment, the frame is rollably connected to the base plate via a plurality of balls.

[0028] In one embodiment, the top surface of the bottom plate is provided with a plurality of bosses, and the top surface of each boss is provided with a first ball groove;

[0029] The bottom surface of the frame is provided with a second ball rolling groove corresponding to each of the first ball rolling grooves;

[0030] Each of the balls is located in each of the first ball grooves and the corresponding second ball groove.

[0031] The frame of the utility model is connected to the installation column through the upper spring sheet and is rollably connected to the bottom plate, does not need to install hanging wires, is easy to install, and the movement and reset of the frame are more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 and Figure 2 It is a three-dimensional diagram of a lens driving mechanism according to an embodiment of the utility model.

[0033] Figure 3 yes Figure 1 An assembly diagram of the frame, base, and carrier in the illustrated embodiment.

[0034] Figure 4 yes Figure 1 Assembly diagram of the frame and carrier in the illustrated embodiment.

[0035] Figure 5 yes Figure 1 A three-dimensional diagram of the frame and the carrier in the illustrated embodiment.

[0036] Figure 6 and Figure 7 It is an assembly diagram of a first metal frame, a second metal frame, a sensor sheet, and an electrode sheet according to an embodiment of the utility model.

[0037] Figure 8 yes Figure 1 Assembly diagram of the circuit board, frame and balls in the illustrated embodiment.

[0038] Reference numerals: 100, lens driving mechanism; 1, base; 11, bottom plate; 12, mounting column; 13, boss; 14, first ball groove; 15, ball; 2, frame; 21, first metal frame; 22, induction plate; 23, slot; 24, first group of magnets; 25, second group of magnets; 26, avoidance groove; 27, second ball groove; 28, protective plate; 3, carrier; 31, second metal frame; 32, electrode plate; 33, coil group; 4, circuit board; 5, upper spring leaf; 6, lower spring leaf; 7, housing; DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0040] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0041] The following will be combined with the accompanying drawings to describe the various embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. 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.

[0042] References throughout the specification to "one 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. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the 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] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0044] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0045] The utility model relates to a lens driving mechanism 100, which comprises a base 1, a frame 2, a carrier 3, an upper spring 5, a lower spring 6, a circuit board 4 and a housing 7, wherein the base 1 is used to support the frame 2 and the carrier 3. The frame 2 and the base 1 are rollably connected. The carrier 3 is connected to the frame 2 and can move in a vertical direction. The carrier 3 is used to install a lens, and the vertical direction is the direction of the optical axis of the lens. The carrier 3 can drive the lens to move in the vertical direction and focus. The upper spring 5 and the lower spring 6 are respectively elastic, the upper spring 5 is located at the top of the frame 2 and connected to the top of the frame 2 and the top of the carrier 3, the lower spring 6 is located at the bottom of the frame 2 and connected to the bottom of the frame 2 and the bottom of the carrier 3, and the upper spring 5 and the lower spring 6 can drive the carrier 3 to reset.

[0046] The base 1 includes a rectangular bottom plate 11, four mounting columns 12 connected to the top surface of the bottom plate 11, and a built-in circuit. The four mounting columns 12 are respectively located at the four corner edges of the bottom plate 11, and the heights of the four mounting columns 12 are substantially the same. The built-in circuit is located in the bottom plate 11, and the four connection ends of the built-in circuit extend from the inside of the mounting column 12 to the top surface of the mounting column 12.

[0047] Optionally, the bottom plate 11 is a circular plate, and a plurality of mounting columns 12 may be mounted at the edge of the bottom plate 11 and arranged at intervals around the circumference of the bottom plate 11 .

[0048] The circuit board 4 is stacked on the top surface of the bottom plate 11 and is provided with a bottom coil. The circuit board 4 is electrically connected to the built-in circuit of the base 1 .

[0049] The frame 2 is rollably connected to the top surface of the bottom plate 11 and is located inside the four mounting columns 12. The frame 2 is a rectangular frame, and the four corners of the frame 2 are respectively provided with avoidance grooves 26 for avoiding the four mounting columns 12. The frame 2 can move slightly in the horizontal direction within the four mounting columns 12 to prevent the lens from shaking. The four mounting columns 12 can also limit the range of motion of the frame 2.

[0050] In a specific embodiment, the frame 2 is rollably connected to the base plate 11 via four balls 15. Figure 2 and Figure 8 As shown, the top surface of the bottom plate 11 is provided with four bosses 13, the four bosses 13 are respectively adjacent to the four mounting columns 12, and the top surface of each boss 13 is provided with a first ball groove 14. The bottom surface of the frame 2 is provided with a second ball groove 27 corresponding to each of the first ball grooves 14. Each of the balls 15 is located in each of the first ball grooves 14 and the corresponding second ball grooves 27.

[0051] In addition, four bosses 13 protrude from the bottom plate 11 and the top surface of the circuit board 4 , and the lower spring leaf 6 is located between the circuit board 4 and the frame 2 . The raised space of the bosses 13 can also provide movement space for the lower spring leaf 6 .

[0052] The frame 2 is also provided with a magnet group, which cooperates with the bottom coil in the circuit board 4 to drive the frame 2 to move in the horizontal direction to prevent the lens from shaking. Of course, in other embodiments, other driving methods can also be used to drive the carrier 3 to move, such as a piezoelectric mechanism.

[0053] The top surface of the frame 2 is preferably flush with the four mounting columns 12, but there may be slight differences.

[0054] The carrier 3 is movably mounted in the ring of the frame 2 and is provided with a coil assembly 33 . The coil assembly 33 cooperates with the magnet assembly to drive the carrier 3 to move in the vertical direction.

[0055] The upper spring piece 5 is also connected to the top surface of the mounting column 12 and is electrically connected to the built-in circuit of the base 1. The upper spring piece 5 can support the frame 2 to be suspended above the base 1, and can also drive the frame 2 to reset after the frame 2 moves.

[0056] As a preferred solution, a first metal frame 21 and a sensing plate 22 electrically connected to the first metal frame 21 are further provided in the frame 2, and the first metal frame 21 is electrically connected to the upper spring sheet 5. A second metal frame 31 and an electrode plate 32 are further provided on the carrier 3, the second metal frame 31 is located inside the carrier 3 and is electrically connected to the upper spring sheet 5, and the electrode plate 32 is located outside the carrier 3 and the top end is connected to the second metal frame 31, and the electrode plate 32 and the sensing plate 22 form a capacitor.

[0057] When the carrier 3 moves in the vertical direction, the electrode plate 32 can be driven to move. The relative area between the electrode plate 32 and the induction plate 22 changes, thereby causing the capacitance of the capacitor to change. The displacement of the carrier 3 can be determined based on the change in the capacitance of the capacitor.

[0058] In a specific embodiment, a slot 23 is provided on the top surface of the frame 2, and the slot 23 is open toward the top surface of the frame 2. The two sensing plates 22 are electrically connected to the first metal frame 21 and are respectively attached to two opposite inner walls of the slot 23. The electrode plate 32 is located radially outside the carrier 3 and can be inserted into the slot 23 and form a capacitor with the two sensing plates 22.

[0059] As a preferred solution, a protective plate 28 is provided on the outer side of the two sensing plates 22. The protective plate 28 is also a metal plate and is electrically connected to the first metal frame 21 to play a role in fixing the potential and improving the accuracy of the capacitor.

[0060] The magnet group includes a first group of magnets 24 and a second group of magnets 25. The first group of magnets 24 is located above the bottom coil and includes a plurality of Halbach array magnets. The Halbach array magnet can refer to the first magnet group in patent CN220509195U. The first group of magnets 24 of the utility model also includes a plurality of axial magnetic strips and a plurality of radial magnetic strips. The axial magnetic strips and the radial magnetic strips are alternately arranged at intervals, and the N poles and S poles of the axial magnetic strips are distributed in the vertical direction, while the magnetic poles of the two adjacent axial magnetic strips are arranged in opposite directions. The N poles and S poles of the radial magnetic strips are distributed in the horizontal direction. The Halbach array magnet arrangement of the first group of magnets 24 can improve the magnetic field lines and Lorentz force passing through the bottom coil, and can improve the driving force of the frame 2 moving in the horizontal direction.

[0061] The second group of magnets 25 cooperates with the coil group 33 of the carrier 3 to drive the carrier 3 to move in the vertical direction. The second group of magnets 25 includes at least two groups of magnetic strips stacked in the vertical direction, and the top corners of the two ends of the magnetic strips at the top are provided with notches, which can provide a space for the frame 2 to avoid and enhance the structural strength of the frame 2.

[0062] The frame 2 of the utility model is connected to the mounting column 12 through the upper spring sheet 5 and is rollably connected to the bottom plate 11, and does not need to install hanging wires. The installation is convenient, and the movement and reset of the frame 2 are more stable.

[0063] Preferred embodiments of the present invention have been described in detail above, but it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0064] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be considered limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0065] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism, characterized in that: include: A base, the base comprising a bottom plate and a plurality of mounting columns, wherein the plurality of mounting columns are respectively connected to the top surface edge of the bottom plate; A frame, the frame is rollably connected to the top surface of the base plate and is located inside the plurality of mounting columns; a carrier connected to the frame and configured to be movable in a vertical direction; and An upper spring sheet is connected to the frame and the carrier, and is also connected to the top surface of the mounting column.

2. The lens driving mechanism according to claim 1, characterized in that: A built-in circuit is provided in the base, and a connection end of the built-in circuit is located on the top surface of the mounting column and is electrically connected to the upper spring sheet; The frame is provided with a magnet group; A coil group is provided on the carrier, and the coil group is electrically connected to the upper spring sheet and cooperates with the magnet group to drive the carrier to move in a vertical direction.

3. The lens driving mechanism according to claim 1, characterized in that: The bottom plate is in the shape of a rectangular plate; The four mounting columns are respectively located at the four corners of the bottom plate and the top surfaces of the mounting columns are flush with the top surface of the frame; The frame is a rectangular frame, and four corners of the frame are respectively provided with avoidance grooves for avoiding the four installation columns.

4. The lens driving mechanism according to claim 2, characterized in that: The lens driving mechanism further comprises a circuit board, which is stacked on the top surface of the bottom plate and is provided with a bottom coil; The magnet group comprises: a first group of magnets, the first group of magnets comprising a plurality of Halbach array magnets, the first group of magnets being located above the bottom coil and cooperating with the bottom coil to drive the frame to move in a horizontal direction; and A second group of magnets, wherein the second group of magnets cooperates with the coil group to drive the carrier to move in a vertical direction.

5. The lens driving mechanism according to claim 4, characterized in that: The second group of magnets includes at least two groups of magnetic strips stacked in the vertical direction, and notches are provided at the top corners of both ends of the magnetic strips located at the top.

6. The lens driving mechanism according to claim 1, characterized in that: A first metal frame and an induction plate electrically connected to the first metal frame are also provided in the frame; A second metal frame is also provided inside the carrier, and an electrode plate is also provided outside the carrier. The top end of the electrode plate is connected to the second metal frame, and the bottom end forms a capacitor with the induction plate.

7. The lens driving mechanism according to claim 6, characterized in that: A slot is provided on the top surface of the frame, and the induction plate overlaps the inner wall of the slot; The electrode plate is located radially outside the carrier and can be inserted into the slot.

8. The lens driving mechanism according to claim 7, characterized in that: A protection plate is also provided in the frame, and the protection plate is located outside the induction plate and is electrically connected to the first metal frame.

9. The lens driving mechanism according to claim 1, characterized in that: The frame is rollably connected to the base plate via a plurality of balls.

10. The lens driving mechanism according to claim 9, characterized in that: The top surface of the bottom plate is provided with a plurality of bosses, and the top surface of each boss is provided with a first ball groove; The bottom surface of the frame is provided with a second ball rolling groove corresponding to each of the first ball rolling grooves; Each of the balls is located in each of the first ball grooves and the corresponding second ball groove.

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