Lens driving mechanism

Abstract

A lens driving mechanism disclosed by the present invention comprises a base, a frame, a carrier and an elastic member, the base is provided with an X-axis coil group and a Y-axis coil group, and the top surface of the base is provided with at least three balls. 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] The present invention relates to the technical field of optical elements, and particularly to a lens driving mechanism. Background Art

[0002] With the development of technology, many current electronic devices (such as smart phones or digital cameras) have functions of taking pictures or videos. The use of these electronic devices is becoming more and more common, and they are developing towards a convenient, thin and light design direction to provide users with more choices.

[0003] The aforementioned electronic devices with functions of taking pictures or videos usually are provided with an optical element driving mechanism to drive an optical element (such as a lens) to move along the optical axis, so as to achieve functions of auto focus (AF) or optical image stabilization (OIS).

[0004] In the optical element driving mechanism of the prior art, its frame and base are connected by balls. The balls are likely to wear the frame, and an abutting plate needs to be arranged in the frame. However, the abutting plate is likely to shake or move in the frame and is not stable enough, so improvement is needed. Summary of the Invention

[0005] An object of the present invention is to provide a lens driving mechanism to solve the problems of the prior art.

[0006] To solve the above technical problems, an embodiment of the present invention provides a lens driving mechanism, including:

[0007] A base, on which an X-axis coil group and a Y-axis coil group are arranged, and at least three balls are arranged on the top surface of the base;

[0008] A frame, which is rollably connected to the base through the balls, and at least three abutting plates, at least two metal sheets, an X-axis magnet group and a Y-axis magnet group are arranged in the frame. At least two of the metal sheets are connected to at least three of the abutting plates and respectively fit the outer sides of the X-axis magnet group and the Y-axis magnet group. The bottom surfaces of the three abutting plates are exposed on the bottom surface of the frame and abut against the balls;

[0009] A carrier, which is connected to the frame and used for installing a lens, and the carrier is arranged to be movable along the optical axis direction of the lens;

[0010] An elastic member, which is connected to the frame and the carrier and used for driving 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 four corners of the rectangular plate;

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

[0013] Three of the abutting plates and two of the metal sheets are provided inside the frame, and the two metal sheets are connected to the three abutting plates.

[0014] In one embodiment, an internal metal frame is provided inside the frame, and the internal metal frame and the metal sheet are insulated from each other;

[0015] A Z-axis coil group is provided inside the frame, and the Z-axis coil group is electrically connected to the internal metal frame;

[0016] The carrier is provided with a Z-axis magnet group, and the Z-axis magnet group and the Z-axis coil group cooperate to drive the carrier to move along the optical axis direction;

[0017] An internal circuit is provided inside the base, and the internal circuit is electrically connected to the internal metal frame through the elastic member;

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

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

[0020] The Z-axis coil group is mounted on the radial inner side of the frame and is disposed opposite to the Z-axis magnet group;

[0021] The carrier is provided with at least two first guide grooves extending along the optical axis direction, 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 direction, and the two guide posts are respectively located in the two first guide grooves.

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

[0024] The frame is provided with two second guide grooves; the two second guide grooves are respectively recessed from the radial inner side of the frame and have bottom walls, and the bottom surface of the bottom wall protrudes from the bottom surface of the frame and is located in the recessed area;

[0025] The guide posts are mounted in the second guide grooves and supported on the bottom walls of the second guide grooves.

[0026] In one embodiment, the base further includes a circuit board, the circuit board is stacked on the top surface of the rectangular plate and is disposed offset from the recessed area, and the circuit board is electrically connected to the internal circuit;

[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 four corners of the rectangular plate;

[0029] Three bosses are provided on the top surface of the rectangular plate, and mounting grooves are respectively provided on the top surfaces of the three bosses;

[0030] A plurality of the balls are provided in each of the mounting grooves.

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

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

[0033] In one embodiment, the circuit board is L-shaped and abuts against two of the bosses at both ends, and an avoidance notch is provided at one of the corners for avoiding the other boss.

[0034] In one embodiment, the Z-axis magnet group includes multiple layers of magnets arranged along the optical axis direction. Description of the Drawings

[0035] Figure 1 、 Figure 2 and Figure 3 are respectively the exploded views of the lens driving mechanism according to an embodiment of the present invention.

[0036] Figure 4 is Figure 1 the exploded view of the base in the shown embodiment.

[0037] Figure 5 is the three-dimensional view of the built-in circuit, the bottom contact plate, the sensor and the built-in adsorption plate according to an embodiment of the present invention.

[0038] Figure 6 is Figure 1 the three-dimensional view of the base in the shown embodiment.

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

[0040] Figure 8 and Figure 9 is Figure 1 the assembly view of the frame and the carrier in the shown embodiment.

[0041] Figure 10Yes Figure 8 An exploded view of the frame and the carrier in the illustrated embodiment.

[0042] Figure 11 A perspective view of the internal suction attachment in a carrier of an embodiment of the present invention.

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

[0044] Figure 13 Yes Figure 12 An exploded view of the base in the illustrated embodiment.

[0045] Figure 14 An assembly diagram of the built-in metal frame, X-axis magnet group, Y-axis magnet group, Z-axis coil group, metal sheet, abutting plate, and metal strip of the frame of an embodiment of the present invention.

[0046] Figure 15 Yes Figure 14 An assembly diagram of the built-in metal frame, metal sheet, abutting plate, and metal strip in the illustrated embodiment.

[0047] Reference numerals: 100, lens driving mechanism; 1, base; 11, rectangular plate; 111, recessed area; 12, support column; 13, boss; 131, mounting groove; 132, ball; 14, circuit board; 15, sensor; 16, bottom abutting plate; 17, built-in circuit; 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, abutting 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 post; 34, suction attachment; 341, anti-slip end; 4, upper spring piece; 5, lower spring piece; 6, outer shell; Detailed Description of the Invention

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will elaborate on the various embodiments of the present invention with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in various embodiments of the present invention, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in each claim of the present application can still be achieved.

[0049] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and its variants, such as "comprising" and "having", should be understood in an open, inclusive sense, that is, construed as "including, but not limited to".

[0050] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings, so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0051] References to "an embodiment" or "an embodiment" throughout the specification mean that the particular features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment. Thus, the appearances of "in an embodiment" or "in an embodiment" throughout the specification do not necessarily all refer to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0052] As used in this specification and the appended claims, the singular forms "a" and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally used in its inclusive sense of "and / or" unless the context clearly dictates otherwise.

[0053] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0054] The present invention relates to a lens driving mechanism 100, which includes a base 1, a frame 2, a carrier 3, an elastic member and a housing 6. Among them, the base 1 includes a rectangular plate 11, an internal circuit 17, four support columns 12, three bosses 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 in the shape of a rectangular plate and has two avoidance grooves on the top surface for mounting sensors 15.

[0057] The internal circuit 17 is located inside the rectangular plate 11 and the connection ends extend into the four support columns 12, facilitating electrical connection with the upper spring piece 4.

[0058] The three bosses 13 are respectively located at the three corners of the rectangular plate 11, two of the bosses 13 are located at the diagonals of the rectangular plate 11, and the three bosses 13 are adjacent to the three support columns 12. The three bosses 13 have the same height and each has an installation groove 131 on its top surface. Four balls 132 are installed in each installation groove 131, and these balls 132 are used to support the rolling of the frame 2. It should be understood that at least one ball 132 is provided in each installation groove 131 to form a triangular stable structure for stably supporting the frame 2. Of course, in other embodiments, three or more balls 132 can also be provided in each installation groove 131, which can be set according to 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 is arranged offset from the recessed area 111. The circuit board 14 is electrically connected to the built-in circuit 17. In the illustrated embodiment, the circuit board 14 is L-shaped, and its two sides are respectively stacked on the two sides between the three bosses 13. That is to say, the circuit board 14 is arranged between the two bosses 13 arranged diagonally. The two ends of the circuit board 14 along its extending direction respectively abut against the two bosses 13 arranged diagonally, and an avoidance notch is provided at the corner of the circuit board 14 for avoiding the other boss 13. The L-shaped circuit board 14 is just clamped between the three bosses 13, and the structure is very stable.

[0061] Two sensors 15 are connected to the circuit board 14 for sensing the position of the frame 2 in the X-axis direction or the Y-axis direction. The X-axis coil group and the Y-axis coil group are respectively electrically connected to the built-in circuit 17, and they can be arranged in the circuit board 14 or in the rectangular plate 11.

[0062] The frame 2 is rollably connected to the rectangular plate 11 through a plurality of balls 132 in the installation groove 131, and an internal 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 sheets 25 and at least three abutting plates 26 are arranged in the frame 2.

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

[0064] The built-in metal frame 21, two metal sheets 25 and at least three abutting plates 26 are respectively embedded in the frame 2. Among them, the three abutting plates 26 are respectively located at three corners of the frame 2, and the bottom surfaces are exposed to the bottom surface of the frame 2. The three abutting plates 26 are respectively aligned with the three bosses 13 of the rectangular plate 11 in the vertical direction and are respectively in rolling connection with the four balls 132 in the three mounting grooves 131. The vertical direction is also the Z-axis direction, that is, the optical axis direction of the lens.

[0065] The two metal sheets 25 are respectively connected to the three abutting plates 26 alternately. That is to say, the two metal sheets 25 are located on both sides of the frame 2 and are respectively connected to the adjacent two abutting plates 26.

[0066] Grooves for mounting the X-axis magnet group 22, the Y-axis magnet group 23 and the Z-axis coil group 24 are respectively provided on three adjacent sides of the frame 2. The X-axis magnet group 22 and the X-axis coil group of the base 1 cooperate to drive the frame 2 to move in the X-axis direction, while the Y-axis magnet group 23 and the Y-axis coil group of the base 1 cooperate to drive the frame 2 to move in the Y-axis direction. The X-axis direction, the Y-axis direction and the optical axis direction are perpendicular to each other in pairs. The frame 2 moves in the X-axis direction or the Y-axis direction for lens anti-shake.

[0067] The two metal sheets 25 and the three abutting plates 26 are not in the same plane. The three abutting plates 26 are close to the bottom surface of the frame 2, while the two metal sheets 25 are close to the top surface of the frame 2. The two metal sheets 25 respectively adhere to the top surfaces of the X-axis magnet group 22 and the Y-axis magnet group 23 for adsorbing the X-axis magnet group 22 and the Y-axis magnet group 23 to increase the stability of the X-axis magnet group 22 and the Y-axis magnet group 23.

[0068] In addition, one of the metal sheets 25 is located on the top surface of the X-axis magnet group 22. The two ends of this metal sheet 25 are respectively connected to the adjacent two abutting plates 26 through two metal strips 27 to form a U-shaped groove, and the X-axis magnet group 22 is clamped in this U-shaped groove.

[0069] Similarly, the other metal sheet 25 is located on the top surface of the Y-axis magnet group 23. The two ends of this metal sheet 25 are respectively connected to the other adjacent two abutting plates 26 through the other two metal strips 27 to form another U-shaped groove for mounting the Y-axis magnet group 23. This design can not only increase the stability of the X-axis magnet group 22 and the Y-axis magnet group 23, but also increase the stability of the abutting plates 26.

[0070] An anti-slip plate 211 is also provided in the frame 2. The anti-slip plate 211 is connected to one of the abutting plates 26 through a metal strip 27. The abutting plate 26 is a flat plate, while the anti-slip plate 211 is a plate in the vertical direction, which can increase the stability of the abutting plate 26.

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

[0072] Specifically, the carrier 3 is annular and is 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] A groove for installing the Z-group magnet group 31 is provided on the radially outer side of the carrier 3, and this groove is aligned with the Z-axis coil group 24 on the frame 2 and opens towards the radially outer side.

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

[0075] An adsorbing member 34 is provided inside the carrier 3. The adsorbing member 34 is a metal sheet and is attached to the side surface of the multiple layers of magnets, for example, located inside the multiple layers of magnets, and is provided with a plurality of anti-slip ends 341. The plurality of anti-slip ends 341 incline towards a direction deviating from the plane of the adsorbing member 34. That is, the plurality of anti-slip ends 341 extend in opposite directions and are not in the same plane as the adsorbing member 34, preventing the adsorbing member 34 from moving and increasing the stability of the adsorbing member 34.

[0076] In addition, two first guiding grooves 32 extending along the optical axis direction are further provided inside the side of the carrier 3 where the Z-group magnet group 31 is installed, and second guiding grooves 28 are further provided on the radially inner side of the frame 2. The two second guiding grooves 28 are aligned with the two first guiding grooves 32 and form a space for installing the guiding posts 33.

[0077] That is to say, the two guiding posts 33 are respectively installed in the space formed by the matching of the two second guiding grooves 28 and the two first guiding grooves 32. The guiding posts 33 extend along the vertical direction and can be installed in this space in a rolling manner. When the carrier 3 moves along the optical axis direction, it will touch the guiding posts 33 and generate rolling friction with the guiding posts 33, reducing the frictional force and also preventing the carrier 3 from tilting, playing a guiding role.

[0078] In addition, the two second guiding grooves 28 are respectively formed by recessing on the radially inner side 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 to say, 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 just to avoid the bottom wall 281 of the second guiding groove 28, so as to provide enough long space for the guiding posts 33 and facilitate the movement of the carrier 3 along the optical axis direction.

[0080] The elastic member includes an upper spring piece 4 and a lower spring piece 5. The upper spring piece 4 and the lower spring piece 5 are respectively located at the top and bottom of the frame 2, and are elastically connected to the frame 2 and the carrier 3 respectively. After the carrier 3 moves, the upper spring piece 4 and the lower spring piece 5 cooperate to drive the carrier 3 to reset.

[0081] The upper spring piece 4 is also electrically connected to the connection end of the built-in circuit 17 at the top end of the support column 12 and is 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 powered on, it can supply power to the Z-axis coil group 24.

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

[0083] In addition, there are also three other bottom abutting plates 16 provided in the base 1. The bottom abutting plates 16 are exposed on the inner wall of the mounting groove 131 of the convex platform 13, that is, form the bottom wall 281 of the mounting groove 131, and are used for rolling connection with the balls 132 in each mounting groove 131 to prevent the rectangular plate 11 from being worn.

[0084] There are also two built-in adsorption plates 18 provided in the base 1. The two built-in adsorption plates 18 are respectively located below the X-axis magnet group 22 and the Y-axis magnet group 23, and are used for adsorbing the X-axis magnet group 22 and the Y-axis magnet group 23 to increase the force for the frame 2 to move towards the rectangular plate 11.

[0085] A chip 29 is also installed in the frame 2. After being powered on, it combines with the Z-axis magnet group to realize the monitoring of the moving position of the carrier 3 and the lens in the optical axis direction, and the chip 29 can also control the energizing current in the Z coil group.

[0086] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that if necessary, aspects of the embodiments can be modified to adopt aspects, features, and concepts of various patents, applications, and publications to provide additional embodiments.

[0087] In view of the above detailed description, these and other changes can be made to the embodiments. Generally speaking, in the claims, the terms used should not be considered to be limited to the specific embodiments disclosed in the specification and the claims, but should be understood to include all possible embodiments together with the full equivalent scope enjoyed by these claims.

[0088] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A lens driving mechanism, characterized in that, Comprising: A base, on which an X-axis coil group and a Y-axis coil group are provided, and at least three balls are provided on the top surface of the base; A frame, which is rollably connected to the base through the balls, and at least three abutting plates, at least two metal sheets, an X-axis magnet group and a Y-axis magnet group are provided inside the frame. At least two of the metal sheets are connected to at least three of the abutting plates and respectively fit against the outer sides of the X-axis magnet group and the Y-axis magnet group. The bottom surfaces of the three abutting plates are exposed to the bottom surface of the frame and abut against the balls; A carrier, which is connected to the frame and is used for mounting a lens, and the carrier is arranged to be movable along the optical axis direction of the lens; An elastic member, which is connected to the frame and the carrier and is used for driving 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 three corners of the rectangular plate; Three of the abutting plates and two of the metal sheets are provided inside the frame, and the two metal sheets are connected to the three abutting plates.

3. The lens driving mechanism according to claim 2, wherein An internal metal frame is provided inside the frame, and the internal metal frame and the metal sheets are insulated; A Z-axis coil group is provided inside the frame, and the Z-axis coil group is electrically connected to the internal metal frame; The carrier is provided with a Z-axis magnet group, and the Z-axis magnet group and the Z-axis coil group cooperate to drive the carrier to move along the optical axis direction; An internal circuit is provided inside the base, and the internal circuit is electrically connected to the internal metal frame through the elastic member; The X-axis coil group and the Y-axis coil group are electrically connected to the internal circuit.

4. The lens driving mechanism according to claim 3, characterized in that, The Z-axis magnet group is mounted on one side of the carrier; The Z-axis coil group is mounted on the radial inner side of the frame and is arranged opposite to the Z-axis magnet group; The carrier is provided with at least two first guiding grooves extending along the optical axis direction, and the two first guiding grooves and the Z-axis magnet group are on the same side of the carrier; The frame is provided with two guiding columns extending along the optical axis direction, and the two guiding columns are respectively located in the two first guiding grooves.

5. The lens driving mechanism according to claim 4, wherein A recessed area is provided on the top surface of the rectangular plate, The frame is provided with two second guiding grooves; the two second guiding grooves are respectively recessed from the radial inner side of the frame and have bottom walls, and the bottom surface of the bottom wall protrudes from the bottom surface of the frame and is located in the recessed area; The guiding columns are mounted in the second guiding grooves and supported on the bottom walls of the second guiding grooves.

6. The lens driving mechanism according to claim 5, wherein The base further includes a circuit board, the circuit board is stacked on the top surface of the rectangular plate and is arranged out of alignment with the recessed area, and the circuit board is electrically connected to the internal circuit; The X-axis coil group and the Y-axis coil group are located in 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; Three bosses are provided on the top surface of the rectangular plate, and mounting grooves are respectively provided on the top surfaces of the three bosses; A plurality of the balls are provided in each of the mounting grooves.

8. The lens driving mechanism according to claim 7, wherein The elastic member includes an upper spring piece and a lower spring piece. The upper spring piece and the lower spring piece are respectively located at the top and bottom of the frame, and are elastically connected to the frame and the carrier respectively; The upper spring piece is electrically connected to the built-in circuit 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 of the corners is provided with an avoidance notch for avoiding the other boss.

10. The lens driving mechanism according to claim 3, wherein The Z-axis magnet group includes multiple layers of magnets arranged along the optical axis direction.

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