Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier and an elastic piece, and a first coil group is arranged in the base. The frame is movably connected with the base and is provided with a magnet group, a built-in metal frame and a partition plate, and the magnet group comprises at least two magnet strips which are arranged side by side; the built-in metal frame is located in the frame and connected with the partition plate, and the partition plate is located between the two magnet strips arranged side by side. And the magnet group is matched with the first coil group to drive the frame to move along the radial direction. The carrier is movably connected with the frame and is provided with a second coil group; and the second coil group is matched with the magnet group to drive the carrier to move along the vertical direction. The elastic piece is elastically 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 driving technology, and in particular to a lens driving mechanism. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones or digital cameras) have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards convenient and thinner designs to provide users with more choices.

[0003] Some electronic devices with photographic or video recording capabilities include a lens drive module to move optical components such as a lens, thereby achieving autofocus and optical image stabilization. Light can pass through the aforementioned optical components to form an image on a photosensitive element.

[0004] In current lens drive mechanisms, image stabilization is achieved by using magnets in the frame in conjunction with coils in the base to drive the frame to move. During the frame's movement, multiple magnet groups move together, and the contact between these magnet groups can cause wobbling, affecting the image stabilization function. Therefore, improvements are needed. Utility Model Content

[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] A base, wherein a first coil assembly is provided within the base;

[0008] A frame, movably connected to the base, is provided with a magnet assembly, an internal metal frame, and a partition plate. The magnet assembly includes at least two magnet strips arranged side by side. The internal metal frame is located within the frame and connected to the partition plate, which is located between the two magnet strips arranged side by side.

[0009] The magnet assembly, in conjunction with the first coil assembly, can drive the frame to move radially.

[0010] The carrier is movably connected to the frame and is provided with a second coil group. The second coil group cooperates with the magnet group to drive the carrier to move in the vertical direction.

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

[0012] In one embodiment, the magnet assembly includes a plurality of radially arranged magnet strips, with each of the separators located between two adjacent magnet strips.

[0013] In one embodiment, the magnet assembly includes a plurality of magnet strips arranged vertically, with each separator located between two adjacent magnet strips.

[0014] In one embodiment, the lens driving mechanism further includes a first capacitor, which includes a first electrode sheet and two first sensing sheets. The two first sensing sheets are connected to the frame and electrically connected to the built-in metal frame, and the first electrode sheet is connected to the carrier.

[0015] In one embodiment, the top surface of the frame is provided with a mounting groove;

[0016] The two first sensing elements are located on the inner walls of both sides of the mounting groove;

[0017] The top end of the first electrode sheet is connected to the outside of the carrier, and the bottom end is located between the two first sensing sheets.

[0018] In one embodiment, the lens driving mechanism further includes a second capacitor and a third capacitor;

[0019] The second capacitor includes a second electrode plate and two second sensing plates. The extension direction of the second electrode plate is parallel to the extension direction of the two second sensing plates. The second electrode plate is connected to the frame and electrically connected to the built-in metal frame.

[0020] The two second sensing elements are connected to the base;

[0021] The third capacitor includes a third electrode plate and two third sensing plates. The extension direction of the third electrode plate is perpendicular to the extension direction of the second electrode plate and is connected to the frame and electrically connected to the built-in metal frame.

[0022] The two third sensing plates are connected to the base.

[0023] In one embodiment, the base includes:

[0024] A base plate, which is rotatably connected to the frame;

[0025] A circuit board, which is stacked on the top surface of the base plate and has the first coil group, two second sensing sheets and two third sensing sheets inside.

[0026] In one embodiment, the base further includes:

[0027] Multiple support columns, wherein the multiple support columns are connected to the base plate;

[0028] An internal circuit is located within the base plate and electrically connected to the circuit board, and at least a portion of the internal circuit extends to the top of the support column and is electrically connected to the internal metal frame.

[0029] In one embodiment, the base further includes an adsorption plate located above or below the built-in circuitry and below the magnet assembly for adsorbing the magnet assembly.

[0030] In one embodiment, the first sensing sheet and the second electrode sheet are integrally formed.

[0031] In one embodiment, the base plate is further provided with a groove, in which a sensing chip is disposed. The sensing chip is electrically connected to the circuit board and to two second sensing sheets and two third sensing sheets.

[0032] This invention features a partition plate within the frame. The partition plate and the built-in metal frame are integrally formed and located between multiple magnetic strips, which can enhance the attraction between the multiple magnets and increase the stability of the frame. Attached Figure Description

[0033] Figure 1 , Figure 2 and Figure 3 This is an exploded view of the lens driving mechanism according to one embodiment of the present invention.

[0034] Figure 4 yes Figure 1 Exploded view of the base in the illustrated embodiment.

[0035] Figure 5 yes Figure 4 A perspective view of the built-in wiring of the base in the illustrated embodiment.

[0036] Figure 6 yes Figure 4 Exploded view of the circuit board in the illustrated embodiment.

[0037] Figure 7 yes Figure 1 A perspective view of the frame in the illustrated embodiment.

[0038] Figure 8 yes Figure 7 An exploded view of the frame in the illustrated embodiment.

[0039] Figure 9 yes Figure 1 Exploded view of the frame and carrier in the illustrated embodiment.

[0040] Figure 10 yes Figure 1The exploded view of the built-in metal strip, the second coil group, the built-in metal frame, the first induction sheet, the second electrode sheet, and the third electrode sheet in the embodiment shown.

[0041] Figure 11 yes Figure 10 The illustrated embodiment shows an assembly diagram of the built-in metal frame, the first sensing plate, the second electrode plate, and the third electrode plate.

[0042] Figure 12 yes Figure 1 Assembly diagram of the lens drive mechanism in the illustrated embodiment.

[0043] Figure 13 yes Figure 12 A cross-sectional view of the lens drive mechanism along line AA in the embodiment shown.

[0044] Reference numerals: 100, Lens drive mechanism; 1, Base; 11, Base plate; 12, Support column; 13, Boss; 131, Ball bearing; 14, Circuit board; 15, First coil group; 16, Built-in circuit; 17, Adsorption plate; 18, Sensing chip; 19, Groove; 2, Frame; 21, Built-in metal frame; 22, Magnet group; 221, Magnet groove; 222, Magnet strip; 23, Divider plate; 24, Mounting groove; 25, First sensing plate; 26, Second electrode plate; 27, Third electrode plate; 28, Shielding plate; 3, Carrier; 31, Second coil group; 32, First electrode plate; 33, Built-in metal strip; 4, Upper spring; 5, Lower spring; 6, Outer shell; Detailed Implementation

[0045] 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.

[0046] 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”.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0051] This utility model relates to a lens driving mechanism 100, such as... Figure 1-3 As shown, the lens drive mechanism 100 includes a base 1, a frame 2, a carrier 3, an elastic element, and a housing 6.

[0052] The base 1 includes a base plate 11, built-in circuitry 16, support column 12, four protrusions 13, sensing chip 18, first coil group 15 and circuit board 14. The base plate 11 is rectangular and has a groove 19 on its top surface for mounting the sensing chip 18.

[0053] Four bosses 13 are located at the four corners of the base plate 11, and each boss has a receiving groove on its top surface. Each receiving groove contains a ball bearing 131, which is used to support the rolling of the frame 2. It should be understood that at least one ball bearing 131 is provided in each receiving groove to form a stable structure to stably support the frame 2.

[0054] The four support columns 12 are of equal height and are respectively connected to the four corners of the base plate 11.

[0055] The built-in circuit 16 is installed inside the base plate 11, and a portion of the connecting section of the built-in circuit 16 extends into the support column 12 for electrical connection with the elastic element, while the other part of the connecting end is used for electrical connection with the circuit board 14 or with an external power supply.

[0056] Circuit board 14 is stacked on top of base plate 11, and its top surface is substantially at the same level as the top surfaces of the four bosses 13. Circuit board 14 is electrically connected to built-in circuitry 16. First coil group 15 is located within circuit board 14 and includes three coil groups. Induction chip 18 is electrically connected to circuit board 14.

[0057] The frame 2 is located above the circuit board 14 and is rotatably connected to the base plate 11 via four ball bearings 131. The frame 2 is provided with a magnet assembly 22, an internal metal frame 21, and multiple partition plates 23.

[0058] The magnet group 22 includes three sets of magnets. At least one set of magnets includes at least two magnetic strips 222 arranged side by side in the radial direction, and at least another set of magnets includes multiple magnetic strips 222 arranged in the vertical direction. The three sets of magnets cooperate with the first coil group 15 to drive the frame 2 to move radially. Radial means two directions perpendicular to the vertical direction. The radial movement of the frame 2 can prevent lens shake.

[0059] The built-in metal frame 21 is located inside the frame 2 and is connected to multiple partition plates 23. Among the multiple partition plates 23, some partition plates 23 are located between two magnetic strips 222 arranged side by side in the radial direction. The multiple partition plates 23 and multiple magnetic strips 222 are arranged alternately, and each partition plate 23 is located between two magnetic strips 222.

[0060] Partial partitions 23 are located between multiple magnetic strips 222 arranged side by side in a vertical direction, with each partition 23 located between two magnetic strips 222.

[0061] exist Figure 8 In the embodiment shown, the frame 2 is provided with a plurality of magnet grooves 221, and each magnet groove 221 is provided with a partition plate 23. The partition plate 23 divides the magnet groove 221 into two parts, and two sets of magnet strips 222 are installed in the magnet groove 221 and located on both sides of the partition plate 23.

[0062] The carrier 3 is used to mount the lens and is movably connected to the frame 2. The carrier 3 is provided with a second coil group 31. The second coil group 31 cooperates with the magnet group 22 to drive the carrier 3 to move in the vertical direction, which is the optical axis direction, so as to adjust the focal length.

[0063] The lens driving mechanism 100 also includes a first capacitor, a second capacitor, and a third capacitor. The first capacitor includes a first electrode plate 32 and two first sensing plates 25. The two first sensing plates 25 are connected to the frame 2 and electrically connected to the built-in metal frame 21 within the frame 2. The first electrode plate 32 is connected to the carrier 3. The first capacitor is used to sense the position of the carrier 3.

[0064] Specifically, a mounting groove 24 is provided on the top surface of one side of the frame 2, and the top of the mounting groove 24 is open to the inside of the frame 2. Two first sensing plates 25 are attached to the inner and outer sides of the mounting groove 24. The top surface of the first electrode plate 32 is connected to the outer side of the carrier 3, and the bottom end is inserted between the two first sensing plates 25.

[0065] The first sensing sheet 25 and the first electrode sheet 32 ​​are arranged in parallel and are both metal sheets extending in a vertical direction.

[0066] The second capacitor includes a second electrode plate 26 and two second sensing plates. The extension direction of the second electrode plate 26 is parallel to the extension direction of the two second sensing plates, and both are metal plates extending along a horizontal plane.

[0067] The second electrode 26 is embedded in the frame 2 and its bottom surface is exposed to the bottom surface of the frame 2. The second electrode 26 and one of the first sensing plates 25 are integrated into an L-shape. The second electrode 26 is also electrically connected to the built-in metal frame 21.

[0068] Two second sensing plates are located inside the circuit board 14 and below the first electrode plate 32.

[0069] The third capacitor includes a third electrode plate 27 and two third sensing plates. The extension direction of the third electrode plate 27 is perpendicular to the extension direction of the second electrode plate 26 and is also embedded in the frame 2. The bottom surface of the second electrode plate 26 is exposed on the bottom surface of the frame 2 and is electrically connected to the built-in metal frame 21.

[0070] Two third sensing plates are located within the circuit board 14 and below the second electrode plate 26. The second and third capacitors can be used at positions of the sensing frame 2 in two radial directions.

[0071] The frame 2 is also equipped with a shielding plate 28, which is a metal plate and is integrally formed with the built-in metal frame 21. The shielding plate 28 is located outside the first sensing plate 25. After being powered on, it can shield external magnetic field information and avoid interfering with the operation of the first capacitor.

[0072] The base 1 is also provided with an adsorption plate 17, which is located above or below the built-in circuit 16, but not on the same horizontal plane as the built-in circuit 16. Several adsorption plates 17 are located below the magnet group 22, which are used to attract the magnet group 22, thereby driving the frame 2 to press towards the base 1.

[0073] The sensing chip 18 is electrically connected to the circuit board 14 and to two second sensing plates and two third sensing plates, and is used to sense the capacitance of the second capacitor and the third capacitor to determine the position of the frame 2.

[0074] 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.

[0075] In addition, the carrier 3 is provided with a built-in metal strip 33, which is electrically connected to the first electrode plate 32 and to the upper spring plate 4.

[0076] The upper spring plate 4 is electrically connected to the built-in circuit 16 at the top of the support column 12, and is also electrically connected to the built-in metal frame 21 of the frame 2. After the built-in circuit 16 is energized, it can supply power to the first electrode plate 32, the second coil group 31, the built-in metal frame 21, the first induction plate 25, the second electrode plate 26 and the third electrode plate 27.

[0077] The outer shell 6 covers the frame 2 and the four support columns 12 and is connected to the base plate 11 for protection.

[0078] This invention features a partition plate within a frame. The partition plate and the built-in metal frame are integrally formed and located between multiple magnetic strips. This placement within the frame enhances the attraction between the multiple magnets and increases the stability of the frame.

[0079] 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.

[0080] 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.

[0081] 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: A base, wherein a first coil assembly is provided within the base; A frame, movably connected to the base, is provided with a magnet assembly, an internal metal frame, and a partition plate. The magnet assembly includes at least two magnet strips arranged side by side. The internal metal frame is located within the frame and connected to the partition plate, which is located between the two magnet strips arranged side by side. The magnet assembly, in conjunction with the first coil assembly, can drive the frame to move radially. The carrier is movably connected to the frame and is provided with a second coil group. The second coil group cooperates with the magnet group to drive the carrier to move in the vertical direction. An elastic element is elastically connected to the frame and the carrier, and is used to drive the carrier to reset.

2. The lens driving mechanism according to claim 1, wherein The magnet assembly includes a plurality of magnetic strips arranged radially, with each of the separators located between two adjacent magnetic strips.

3. The lens driving mechanism according to claim 1, wherein The magnet assembly includes multiple magnet strips arranged vertically, with each separator located between two adjacent magnet strips.

4. The lens driving mechanism according to claim 1, wherein The lens driving mechanism further includes a first capacitor, which includes a first electrode plate and two first sensing plates. The two first sensing plates are connected to the frame and electrically connected to the built-in metal frame. The first electrode plate is connected to the carrier.

5. The lens driving mechanism according to claim 4, wherein The top surface of the frame is provided with a mounting groove; The two first sensing elements are located on the inner walls of both sides of the mounting groove; The top end of the first electrode sheet is connected to the outside of the carrier, and the bottom end is located between the two first sensing sheets.

6. The lens driving mechanism according to claim 4, wherein The lens driving mechanism also includes a second capacitor and a third capacitor; The second capacitor includes a second electrode plate and two second sensing plates. The extension direction of the second electrode plate is parallel to the extension direction of the two second sensing plates. The second electrode plate is connected to the frame and electrically connected to the built-in metal frame. The two second sensing elements are connected to the base; The third capacitor includes a third electrode plate and two third sensing plates. The extension direction of the third electrode plate is perpendicular to the extension direction of the second electrode plate and is connected to the frame, and is electrically connected to the built-in metal frame. The two third sensing plates are connected to the base.

7. The lens driving mechanism according to claim 6, wherein The base includes: A base plate, which is rotatably connected to the frame; A circuit board, which is stacked on the top surface of the base plate and has the first coil group, two second induction plates and two third induction plates inside.

8. The lens driving mechanism according to claim 7, wherein The base also includes: Multiple support columns, wherein the multiple support columns are connected to the base plate; Built-in wiring, which is located within the base plate and electrically connected to the circuit board, with at least a portion of the built-in wiring extending to the top of the support column and electrically connected to the built-in metal frame.

9. The lens driving mechanism according to claim 8, wherein The base also includes an adsorption plate, which is located above or below the built-in circuit and below the magnet assembly, for adsorbing the magnet assembly.

10. The lens driving mechanism according to claim 6, wherein One of the first sensing sheets and the second electrode sheet are integrally formed.

11. The lens driving mechanism according to claim 8, wherein The base plate is also provided with a groove, in which a sensing chip is provided. The sensing chip is electrically connected to the circuit board and to two second sensing plates and two third sensing plates.

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