Lens driving mechanism

Abstract

The utility model discloses a lens driving mechanism, which comprises a base, a frame, a carrier and an elastic piece, an X-axis coil group and a Y-axis coil group are arranged on the base, and at least three balls are arranged on the top surface of the base. The frame is connected with the base in a rolling mode through the balls, at least three abutting plates, at least two metal sheets, an X-axis magnet set and a Y-axis magnet set are arranged in the frame, and the at least two metal sheets are connected with the at least three abutting plates and attached to the outer sides of the X-axis magnet set and the Y-axis magnet set respectively. The bottom faces of the three abutting plates are exposed out of the bottom face of the frame and abut against the balls. The carrier is connected with the frame and used for installing a lens, and the carrier is arranged to be capable of moving in the optical axis direction of the lens. 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 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 a more convenient and thinner design to provide users with more choices.

[0003] The aforementioned electronic devices with photographic or video recording functions are typically equipped with an optical element driving mechanism to drive the optical element (e.g., a lens) to move along the optical axis, thereby achieving the functions of autofocus (AF) or optical image stabilization (OIS).

[0004] In existing optical element driving mechanisms, the frame and base are connected by ball bearings. The ball bearings are prone to wear on the frame, so an abutment plate needs to be installed inside the frame. However, the abutment plate is prone to shaking or moving inside the frame and is not stable enough, so it needs to be improved. 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] A base, on which an X-axis coil group and a Y-axis coil group are provided, and at least three ball bearings are provided on the top surface of the base;

[0008] The frame is rotatably connected to the base via the ball bearings, and the frame contains at least three abutment plates, at least two metal sheets, an X-axis magnet group, and a Y-axis magnet group. The at least two metal sheets are connected to the at least three abutment plates and respectively abut the outer sides of the X-axis magnet group and the Y-axis magnet group. The bottom surfaces of the three abutment plates are exposed on the bottom surface of the frame and abut against the ball bearings.

[0009] A carrier connected to the frame for mounting a lens, the carrier being configured to move along the optical axis of the lens;

[0010] An elastic element, which is connected to the frame and the carrier, is used to drive the carrier to reset.

[0011] In one embodiment, the base includes a rectangular plate and four support columns; the four support columns are connected to the four corners of the rectangular plate.

[0012] At least three of the balls are located at the three corners of the rectangular plate;

[0013] The frame contains three abutment plates and two metal sheets, with the two metal sheets connected to the three abutment plates.

[0014] In one embodiment, the frame is provided with a built-in metal frame, and the built-in metal frame and the metal sheet are insulated from each other;

[0015] The frame contains a Z-axis coil group, which is electrically connected to the built-in metal frame.

[0016] The carrier is equipped with a Z-axis magnet group, which, in conjunction with the Z-axis coil group, can drive the carrier to move along the optical axis.

[0017] The base has an internal wiring, which is electrically connected to the internal metal frame via the elastic element.

[0018] The X-axis coil group and the Y-axis coil group are electrically connected to the built-in circuit.

[0019] In one embodiment, the Z-axis magnet assembly is mounted on one side of the carrier;

[0020] The Z-axis coil assembly is installed on the radial inner side of the frame and is positioned opposite to the Z-axis magnet assembly.

[0021] The carrier is provided with at least two first guide grooves extending along the optical axis, and the two first guide grooves and the Z-axis magnet group are located on the same side of the carrier;

[0022] The frame is provided with two guide posts extending along the optical axis, and the two guide posts are respectively located in the two first guide grooves.

[0023] In one embodiment, the top surface of the rectangular plate is provided with a recessed area.

[0024] The frame is provided with two second guide grooves; the two second guide grooves are respectively formed by a radial inward recess of the frame and have a bottom wall, the bottom surface of the bottom wall protruding from the bottom surface of the frame and located within the recessed area;

[0025] The guide post is installed in the second guide groove and supported on the bottom wall of the second guide groove.

[0026] In one embodiment, the base further includes a circuit board, which is stacked on the top surface of the rectangular plate and offset from the recessed area, and the circuit board is electrically connected to the built-in circuitry.

[0027] The X-axis coil group and the Y-axis coil group are located within the circuit board or the rectangular plate.

[0028] In one embodiment, the base includes a rectangular plate and four support columns; the four support columns are connected to the four corners of the rectangular plate.

[0029] The top surface of the rectangular plate is provided with three protrusions, and the top surface of each of the three protrusions is provided with a mounting groove.

[0030] Each of the mounting slots is provided with a plurality of the ball bearings.

[0031] In one embodiment, the elastic element includes an upper spring and a lower spring, the upper spring and the lower spring being located at the top and bottom of the frame, respectively, and being elastically connected to the frame and the carrier, respectively.

[0032] The upper spring is electrically connected to the built-in wiring and the built-in metal frame of the frame.

[0033] In one embodiment, the circuit board is L-shaped with both ends abutting against two of the bosses, and one corner is provided with a clearance notch for avoiding the other boss.

[0034] In one embodiment, the Z-axis magnet group comprises multiple layers of magnets arranged along the optical axis. Attached Figure Description

[0035] Figure 1 , Figure 2 and Figure 3 These are exploded views of a lens driving mechanism according to one embodiment of this utility model.

[0036] Figure 4 yes Figure 1 Exploded view of the base in the illustrated embodiment.

[0037] Figure 5 This is a perspective view of the built-in circuit, bottom abutment plate, sensor, and built-in adsorption plate of one embodiment of the present invention.

[0038] Figure 6 yes Figure 1 A perspective view of the base in the illustrated embodiment.

[0039] Figure 7 yes Figure 1 An exploded view of the lens driving mechanism of the embodiment shown.

[0040] Figure 8 and Figure 9 yes Figure 1 Assembly diagram of the frame and carrier in the illustrated embodiment.

[0041] Figure 10 yes Figure 8 Exploded view of the frame and carrier in the illustrated embodiment.

[0042] Figure 11 This is a perspective view of the adsorption component inside the carrier according to an embodiment of the present invention.

[0043] Figure 12 yes Figure 1 A perspective view of the base in the illustrated embodiment.

[0044] Figure 13 yes Figure 12 Exploded view of the base in the illustrated embodiment.

[0045] Figure 14 This is an assembly diagram of the built-in metal frame, X-axis magnet group, Y-axis magnet group, Z-axis coil group, metal sheet, abutment plate and metal strip of a frame according to an embodiment of the present invention.

[0046] Figure 15 yes Figure 14 The illustrated embodiment shows an assembly diagram of the built-in metal frame, metal sheet, abutment plate, and metal strip.

[0047] Reference numerals: 100, Lens drive mechanism; 1, Base; 11, Rectangular plate; 111, Recessed area; 12, Support column; 13, Boss; 131, Mounting groove; 132, Ball bearing; 14, Circuit board; 15, Sensor; 16, Bottom abutment plate; 17, Built-in circuitry; 18, Built-in adsorption plate; 2, Frame; 21, Built-in metal frame; 22, X-axis magnet group; 23, Y-axis magnet group; 24, Z-axis coil group; 25, Metal sheet; 26, Abutment plate; 27, Metal strip; 28, Second guide groove; 281, Bottom wall; 29, Chip; 211, Anti-slip plate; 3, Carrier; 31, Z-group magnet group; 32, First guide groove; 33, Guide column; 34, Adsorption component; 341, Anti-slip end; 4, Upper spring; 5, Lower spring; 6, Housing; Detailed Implementation

[0048] 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.

[0049] 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”.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] This utility model relates to a lens driving mechanism 100, which includes a base 1, a frame 2, a carrier 3, an elastic element, and a housing 6. The base 1 includes a rectangular plate 11, built-in circuitry 17, four support columns 12, three protrusions 13 located on the top surface of the rectangular plate 11, an X-axis coil group, a Y-axis coil group, and a circuit board 14.

[0055] The base 1 includes a rectangular plate 11 and four support columns 12; the four support columns 12 are of equal height and are respectively connected to the four corners of the rectangular plate 11.

[0056] The rectangular plate 11 is rectangular and has two clearance slots on its top surface for mounting the sensor 15.

[0057] The built-in circuit 17 is located inside the rectangular plate 11 and the connection end extends into the four support columns 12, which facilitates electrical connection with the upper spring 4.

[0058] Three protrusions 13 are located at the three corners of the rectangular plate 11, with two protrusions 13 located at opposite corners of the rectangular plate 11. The three protrusions 13 are adjacent to three support columns 12. The three protrusions 13 are of equal height and each has a mounting groove 131 on its top surface. Each mounting groove 131 contains four ball bearings 132, which support the rolling of the frame 2. It should be understood that at least one ball bearing 132 is provided in each mounting groove 131 to form a triangular stable structure for stabilizing the support frame 2. Of course, in other embodiments, each mounting groove 131 may also contain three or more ball bearings 132, depending on the requirements.

[0059] The top surface of the rectangular plate 11 is also provided with a recessed area 111, which is located on one side of the rectangular plate 11. And the side where the recessed area 111 is located is not between the two bosses 13.

[0060] The circuit board 14 is stacked on the top surface of the rectangular plate 11 and offset from the recessed area 111. The circuit board 14 is electrically connected to the built-in circuit 17. In the embodiment shown in the figure, the circuit board 14 is L-shaped, and its two sides are stacked on both sides between the three protrusions 13. That is, the circuit board 14 is disposed between two protrusions 13 arranged diagonally. The two ends of the circuit board 14 along its extension direction abut against the two diagonally arranged protrusions 13, and the corner of the circuit board 14 is provided with a clearance notch to avoid another protrusion 13. The L-shaped circuit board 14 fits perfectly between the three protrusions 13, and the structure is very stable.

[0061] Two sensors 15 are connected to the circuit board 14 to sense the position of the frame 2 along the X-axis or Y-axis. The X-axis coil group and the Y-axis coil group are electrically connected to the built-in circuit 17, which can be set inside the circuit board 14 or inside the rectangular plate 11.

[0062] The frame 2 is rotatably connected to the rectangular plate 11 via multiple balls 132 in the mounting groove 131, and the frame 2 is provided with a built-in metal frame 21, an X-axis magnet group 22, a Y-axis magnet group 23, a Z-axis coil group 24, at least two metal plates 25 and at least three abutment plates 26.

[0063] Specifically, the frame 2 is a rectangular ring located between four support columns 12 and is insulated from the metal sheet 25 or the abutment plate 26.

[0064] An internal metal frame 21, two metal plates 25, and at least three abutment plates 26 are embedded within the frame 2. The three abutment plates 26 are located at the three corners of the frame 2, with their bottom surfaces exposed above the bottom surface of the frame 2. The three abutment plates 26 are vertically aligned with the three protrusions 13 of the rectangular plate 11 and are rotatably connected to the four balls 132 in the three mounting slots 131. The vertical direction is the Z-axis direction, which is the optical axis direction of the lens.

[0065] Two metal plates 25 are alternately connected to three abutment plates 26, that is, the two metal plates 25 are located on both sides of the frame 2 and are respectively connected to two adjacent abutment plates 26.

[0066] The frame 2 has grooves on its three adjacent sides for mounting the X-axis magnet group 22, the Y-axis magnet group 23, and the Z-axis coil group 24. The X-axis magnet group 22, in conjunction with the X-axis coil group of the base 1, drives the frame 2 to move along the X-axis direction, while the Y-axis magnet group 23, in conjunction with the Y-axis coil group of the base 1, drives the frame 2 to move along the Y-axis direction. The X-axis, Y-axis, and optical axis directions are perpendicular to each other. The frame 2 moves along either the X-axis or Y-axis direction to stabilize the lens.

[0067] The two metal plates 25 and the three abutment plates 26 are not on the same plane. The three abutment plates 26 are close to the bottom surface of the frame 2, while the two metal plates 25 are close to the top surface of the frame 2. The two metal plates 25 are respectively attached to the top surfaces of the X-axis magnet group 22 and the Y-axis magnet group 23 to attract the X-axis magnet group 22 and the Y-axis magnet group 23, thereby increasing the stability of the X-axis magnet group 22 and the Y-axis magnet group 23.

[0068] In addition, one of the metal plates 25 is located on the top surface of the X-axis magnet assembly 22. The two ends of the metal plate 25 are connected to two adjacent abutment plates 26 by two metal strips 27 to form a U-shaped groove, and the X-axis magnet assembly 22 is engaged in the U-shaped groove.

[0069] Similarly, another metal plate 25 is located on the top surface of the Y-axis magnet assembly 23. The two ends of this metal plate 25 are connected to two adjacent abutment plates 26 via two other metal strips 27, forming another U-shaped groove for mounting the Y-axis magnet assembly 23. This design increases the stability of both the X-axis magnet assembly 22 and the Y-axis magnet assembly 23, as well as the stability of the abutment plates 26.

[0070] The frame 2 is also equipped with an anti-slip plate 211, which is connected to one of the abutment plates 26 by a metal strip 27. The abutment plate 26 is a flat plate, while the anti-slip plate 211 is a vertical plate, which can increase the stability of the abutment plate 26.

[0071] The groove for mounting the Z-axis coil assembly 24 opens towards the inside of the frame 2, and is used to cooperate with the Z-axis magnet assembly of the carrier 3 to drive the carrier 3 to move along the optical axis of the lens. In addition, the side where the Z-axis coil assembly 24 is mounted is vertically aligned with the side on the rectangular plate 11 where the recessed area 111 is provided.

[0072] Specifically, the carrier 3 is ring-shaped and installed inside the ring of the frame 2, and the inside of the ring of the carrier 3 is used to install the lens.

[0073] The carrier 3 has a groove on its radially outer side for mounting the Z-group magnet group 31, and the groove is aligned with the Z-axis coil group 24 on the frame 2 and is open to the radially outer side.

[0074] The side of the carrier 3 where the Z-axis magnet group 31 is mounted is aligned with the side of the frame 2 where the Z-axis coil group 24 is mounted. The Z-axis magnet group includes multiple layers of magnets arranged along the optical axis. The multiple layers of magnets can increase the magnetic field lines formed by the Z-axis coil group 24 along the optical axis, thereby increasing the driving stroke.

[0075] The carrier 3 is provided with an adsorption element 34, which is a metal sheet and is attached to the side of the multi-layer magnet, for example, located on the inner side of the multi-layer magnet. It is provided with multiple anti-slip ends 341, which are inclined in a direction away from the plane of the adsorption element 34. That is, the multiple anti-slip ends 341 extend in the opposite direction and are not on the same plane as the adsorption element 34, so as to prevent the adsorption element 34 from moving and increase the stability of the adsorption element 34.

[0076] In addition, the carrier 3 has two first guide grooves 32 extending along the optical axis on the side where the Z-group magnet group 31 is installed, and the frame 2 has a second guide groove 28 on the radial inner side. The two second guide grooves 28 and the two first guide grooves 32 are aligned and form a space for installing the guide post 33.

[0077] In other words, the two guide posts 33 are respectively installed in the space formed by the matching of the two second guide grooves 28 and the two first guide grooves 32. The guide posts 33 extend vertically and can be rolled in this space. When the carrier 3 moves along the optical axis, it will touch the guide posts 33, generating rolling friction with the guide posts 33, reducing friction, and also preventing the carrier 3 from tilting, thus playing a guiding role.

[0078] In addition, the two second guide grooves 28 are respectively formed by the radial inner recess of the frame 2 and have bottom walls 281. The bottom of the bottom wall 281 extends beyond the bottom surface of the frame 2. That is, the bottom of the bottom wall 281 protrudes from the bottom surface of the frame 2 and is located in the recessed area 111 of the rectangular plate 11.

[0079] The recessed area 111 of the rectangular plate 11 is designed to avoid the bottom wall 281 of the second guide groove 28, so as to provide a sufficiently long space for the guide post 33 to facilitate the movement of the carrier 3 along the optical axis.

[0080] 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.

[0081] The upper spring plate 4 is also electrically connected to the connection end of the built-in circuit 17 at the top of the support column 12, and electrically connected to the built-in metal frame 21 in the frame 2. The built-in metal frame 21 is electrically connected to the Z-axis coil group 24. After the built-in circuit is energized, it can supply power to the Z-axis coil group 24.

[0082] The outer shell 6 covers the frame 2 and the support column 12 and is fixedly connected to the rectangular plate 11, serving a protective function.

[0083] In addition, the base 1 is also provided with three other bottom abutment plates 16, which are exposed on the inner wall of the mounting groove 131 of the boss 13, that is, the bottom wall 281 forming the mounting groove 131, for rolling connection with the ball bearing 132 of each mounting groove 131 to prevent wear on the rectangular plate 11.

[0084] The base 1 is also equipped with two built-in adsorption plates 18, which are located below the X-axis magnet group 22 and the Y-axis magnet group 23 respectively, and are used to adsorb the X-axis magnet group 22 and the Y-axis magnet group 23, thereby increasing the force of the frame 2 moving toward the rectangular plate 11.

[0085] Chip 29 is also installed inside frame 2. When powered on, it is combined with the Z-axis magnet group to monitor the movement position of carrier 3 and lens in the optical axis direction. Chip 29 can also control the current in the Z coil group.

[0086] 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.

[0087] 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.

[0088] 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, on which an X-axis coil group and a Y-axis coil group are provided, and at least three ball bearings are provided on the top surface of the base; The frame is rotatably connected to the base via the ball bearings, and the frame contains at least three abutment plates, at least two metal sheets, an X-axis magnet group, and a Y-axis magnet group. The at least two metal sheets are connected to the at least three abutment plates and respectively abut the outer sides of the X-axis magnet group and the Y-axis magnet group. The bottom surfaces of the three abutment plates are exposed on the bottom surface of the frame and abut against the ball bearings. A carrier connected to the frame for mounting a lens, the carrier being configured to move along the optical axis of the lens; 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 base includes a rectangular plate and four support columns; the four support columns are connected to the four corners of the rectangular plate. At least three of the balls are located at the three corners of the rectangular plate; The frame contains three abutment plates and two metal sheets, with the two metal sheets connected to the three abutment plates.

3. The lens driving mechanism according to claim 2, wherein The frame is provided with an internal metal frame, and the internal metal frame and the metal sheet are insulated from each other. The frame contains a Z-axis coil group, which is electrically connected to the built-in metal frame. The carrier is equipped with a Z-axis magnet group, which, in conjunction with the Z-axis coil group, can drive the carrier to move along the optical axis. The base has an internal wiring, which is electrically connected to the internal metal frame through the elastic element. The X-axis coil group and the Y-axis coil group are electrically connected to the built-in circuit.

4. The lens driving mechanism according to claim 3, wherein The Z-axis magnet assembly is mounted on one side of the carrier; The Z-axis coil assembly is installed on the radial inner side of the frame and is positioned opposite to the Z-axis magnet assembly. The carrier is provided with at least two first guide grooves extending along the optical axis, and the two first guide grooves and the Z-axis magnet group are located on the same side of the carrier; The frame is provided with two guide posts extending along the optical axis, and the two guide posts are respectively located in the two first guide grooves.

5. The lens driving mechanism according to claim 4, wherein The top surface of the rectangular plate is provided with a recessed area. The frame is provided with two second guide grooves; the two second guide grooves are respectively formed by a radial inward recess of the frame and have a bottom wall, the bottom surface of the bottom wall protruding from the bottom surface of the frame and located within the recessed area; The guide post is installed in the second guide groove and supported on the bottom wall of the second guide groove.

6. The lens driving mechanism according to claim 5, wherein The base also includes a circuit board, which is stacked on the top surface of the rectangular plate and offset from the recessed area. The circuit board is electrically connected to the built-in circuitry. The X-axis coil group and the Y-axis coil group are located within the circuit board or the rectangular plate.

7. The lens driving mechanism according to claim 6, wherein The base includes a rectangular plate and four support columns; the four support columns are connected to the four corners of the rectangular plate. The top surface of the rectangular plate is provided with three protrusions, and the top surface of each of the three protrusions is provided with a mounting groove. Each of the mounting slots is provided with a plurality of the ball bearings.

8. The lens driving mechanism according to claim 7, wherein The elastic element includes an upper spring and a lower spring, which are located at the top and bottom of the frame, respectively, and are elastically connected to the frame and the carrier, respectively. The upper spring is electrically connected to the built-in wiring and the built-in metal frame of the frame.

9. The lens driving mechanism according to claim 8, wherein The circuit board is L-shaped and its two ends abut against two of the bosses, and one corner is provided with a clearance notch, which is used to avoid the other boss.

10. The lens driving mechanism according to claim 3, characterized in that, The Z-axis magnet group comprises multiple layers of magnets arranged along the optical axis.

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