Lens drive device

Abstract

The present invention discloses a lens driving device, which includes a base, a carrier, multiple reeds and multiple suspension wires. The base includes a bottom plate, two side plates and two side circuit boards, and the bottom plate is provided with a bottom coil; the two side plates are arranged at intervals and connected to the top surface of the bottom plate; the two side circuit boards are respectively connected to the two side plates and respectively provided with side coils; the carrier is movably installed on the top surface of the bottom plate and is located between the two side plates, and side magnets are respectively provided on both sides of the carrier, and the side magnets cooperate with the side coils to drive the carrier to move along the optical axis; the bottom of the carrier is provided with a bottom magnet, and the bottom magnet cooperates with the bottom coil to drive the carrier to move in a direction perpendicular to the optical axis; a metal sheet is provided inside the carrier, and the metal sheet is used to enhance the strength of the side magnets and the bottom magnet; multiple reeds are connected to the top of the carrier; the bottom ends of multiple suspension wires are respectively connected to the bottom plate, and the top ends are respectively connected to the multiple reeds.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to a lens driving device. 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 mechanism to drive the optical components of the lens to move, thereby achieving the functions of autofocus and optical image stabilization.

[0004] In the prior art, the lens drive mechanism's carrier is equipped with a magnet that cooperates with the coil on the base to drive the carrier's movement. The magnet needs to be stably connected to the carrier to prevent it from falling off during movement. Therefore, a carrier design is needed that allows the magnet to be stably mounted within it. Summary of the Invention

[0005] The object of the present invention is to provide a lens driving device to solve the above-mentioned problem.

[0006] In order to solve the above technical problems, the present invention provides a lens driving device, which includes:

[0007] A base, comprising:

[0008] a bottom plate, wherein the bottom plate is provided with a bottom coil;

[0009] two side panels, the two side panels being spaced apart and connected to the top surface of the bottom panel; and

[0010] Two side circuit boards, the two side circuit boards are respectively connected to the two side plates and are respectively provided with side coils;

[0011] A carrier, the carrier being movably mounted on the top surface of the bottom plate and located between the two side plates, with side magnets being respectively provided on both sides of the carrier, and the side magnets cooperating with the side coils to drive the carrier to move along the optical axis; a bottom magnet being provided at the bottom of the carrier, and the bottom magnet cooperating with the bottom coils to drive the carrier to move in a direction perpendicular to the optical axis; a metal sheet being provided inside the carrier, and the metal sheet being used to enhance the strength of the side magnets and the bottom magnet;

[0012] a plurality of reeds connected to the top of the carrier; and

[0013] A plurality of suspension wires, the bottom ends of the plurality of suspension wires are respectively connected to the bottom plate, and the top ends are respectively connected to the plurality of reeds.

[0014] In one embodiment, two sets of bottom magnets are connected to the bottom of the carrier;

[0015] The metal sheet comprises:

[0016] Two bottom metal sheets, the two bottom metal sheets are embedded in the bottom of the carrier and correspond to the two groups of bottom magnets respectively; and

[0017] Two side metal sheets, the bottom ends of the two side metal sheets are respectively connected to the two bottom metal sheets, and the top ends extend away from the bottom metal sheets and respectively correspond to the two side magnets.

[0018] In one embodiment, the two side metal sheets are respectively formed integrally with the two bottom metal sheets.

[0019] In one embodiment, side mounting grooves are respectively provided on both sides of the carrier, and the two side magnets are respectively located in the two side mounting grooves;

[0020] The bottom of the carrier is provided with a plurality of bottom mounting grooves, and the two groups of bottom magnets are located in the bottom mounting grooves.

[0021] In one embodiment, the top surface of the base plate is provided with a plurality of shoulders, the top surface of the shoulders is provided with a groove, and a damping colloid is provided in the groove; the bottom of the carrier is provided with a plurality of bumps, and the plurality of bumps are respectively located above the plurality of shoulders and respectively connected to the plurality of damping colloids.

[0022] In one embodiment, the bottom surface of the protrusion is a curved surface or is provided with a protrusion.

[0023] In one embodiment, a built-in circuit is provided in the base, and the built-in circuit extends into the side panel and is electrically connected to the side circuit board.

[0024] In one embodiment, the built-in circuit extends beyond the top surface of the side plate and is electrically connected to the side circuit board.

[0025] In one embodiment, the base further includes a flexible circuit board and a sensor, wherein the flexible circuit board is stacked on the top surface of the bottom plate, and the sensor is connected to the flexible circuit board.

[0026] In one embodiment, the base further includes a bottom circuit board, which is stacked on a top surface of the flexible circuit board, and the bottom coil is disposed in the bottom circuit board.

[0027] In the lens drive device of the present invention, a metal sheet is embedded inside the carrier, which can enhance the connection stability between the side magnets and the bottom magnet and the carrier. In addition, a bump is provided at the bottom of the carrier, which is connected to the damping colloid of the base, and the bottom surface of the bump is provided with a protrusion. The multiple protrusions can increase the connection strength between the bump and the damping colloid, thereby enhancing the stability of the carrier movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0029] Figure 1 FIG. 1 is an exploded view of a lens driving device according to an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Assembly diagram of the carrier, base, bottom circuit board, side circuit board, spring wire and four suspension wires in the illustrated embodiment.

[0031] Figure 3 and Figure 4 yes Figure 1 A perspective view of the base in the illustrated embodiment.

[0032] Figure 5 yes Figure 3 A perspective view of the built-in circuitry in the illustrated embodiment.

[0033] Figure 6 and Figure 7 yes Figure 1 A perspective view of the carrier in the illustrated embodiment.

[0034] Figure 8 yes Figure 6 A perspective view of the metal sheet in the illustrated embodiment.

[0035] Figure 9 yes Figure 1 A three-dimensional diagram of the carrier, suspension wire, and reed in the illustrated embodiment.

[0036] Figure numerals: 100, lens driving device; 1, base; 11, bottom plate; 111, shoulder; 112, groove; 113, damping colloid; 114, positioning column; 12, side plate; 13, built-in circuit; 131, bottom circuit; 132, side circuit; 14, flexible circuit board; 15, bottom circuit board; 16, side circuit board; 17, sensor; 2, carrier; 21, side mounting groove; 22, bottom mounting groove; 23, side magnet; 24, bottom magnet; 25, bump; 26, protrusion; 27, lens mounting hole; 28, metal sheet; 281, bottom metal sheet; 282, side metal sheet; 3, shell; 4, spring; 5, suspension wire. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that in each embodiment of the present invention, many technical details are provided to facilitate a better understanding of the present application. However, even without these technical details and various variations and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0038] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0039] 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, that is, should be interpreted to mean "including, but not limited to."

[0040] The following will describe in detail various embodiments of the present invention in conjunction with the accompanying drawings to provide a clearer understanding of the objectives, features 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.

[0041] Reference throughout this specification to "one embodiment" or "an embodiment" means 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 this 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.

[0042] 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.

[0043] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0044] The present invention relates to a lens driving device 100, such as Figure 1 and Figure 2 As shown, the lens driving mechanism includes a base 1 , a shell 3 , a carrier 2 , a plurality of springs 4 and a plurality of suspension wires 5 .

[0045] The base 1 is used to carry the carrier 2, such as Figure 2 、 Figure 3 and Figure 4 As shown, the base 1 includes a bottom plate 11, two side plates 12, and an internal built-in circuit 13. The bottom plate 11 is rectangular and has shoulders 111 at each corner. The top surfaces of the four shoulders 111 are respectively provided with grooves 112. Each groove 112 is provided with a damping colloid 113, which is used to connect to the bottom of the carrier 2.

[0046] The two side panels 12 of the base 1 are respectively arranged parallel to a pair of opposite side edges of the bottom plate 11. The two side panels 12 are arranged parallel and spaced apart and connected to the top surface of the bottom plate 11. The two side panels 12 are close to a pair of opposite side edges of the bottom plate 11 to limit the movement of the carrier 2.

[0047] The built-in circuit 13 in the base 1 includes a bottom circuit 131 and a side circuit 132 electrically connected to each other. Figure 5 As shown, the bottom circuit 131 is located in the bottom plate 11, while the side circuit 132 is located in the two side plates 12 and extends beyond the top surface of the side plates 12. The top of the side circuit 132 is electrically connected to the side circuit board 16. The bottom circuit 131 and the side circuit 132 are integrally formed, and the bottom plate 11 and the side plates 12 are integrally formed by injection molding. During the manufacturing process, it is only necessary to embed the entire built-in circuit 13 in the bottom plate 11 and the two side plates 12 by injection molding. This is convenient for processing and can increase the connection strength between the side plates 12 and the bottom plate 11. Moreover, the bottom circuit 131 and the side circuit 132 are integrally formed and arranged perpendicular to each other. The bottom circuit 131 and the side circuit 132 restrict each other's movement, so that the entire built-in circuit 13 can be stably located in the preset position without misalignment.

[0048] The two side circuit boards 16 are respectively attached to the inner surfaces of the two side panels 12, and the outer surfaces of the two side circuit boards 16 are respectively provided with two connection ends, which correspond to and are electrically connected to the top ends of the side circuits 132. It should be understood that the two side circuit boards 16 can also be attached to the outer surfaces of the two side panels 12, and the specific positions of the two side circuit boards 16 are not limited.

[0049] Furthermore, the side circuit board 16 houses a side coil, and the built-in circuit 13 within the side panel 12 energizes the side coil, reducing the need for external power cables to entangle the side circuit board 16 and providing power to the side circuit board 16. Furthermore, the shape of the built-in circuit 13 within the base 1 is very stable, and the side panel 12 to which the side circuit board 16 is attached maintains a very stable positional relationship. This ensures a very stable connection between the side circuit board 16 and the built-in circuit 13, ensuring the stability of the circuitry within the side circuit board 16.

[0050] A flexible circuit board 14 and a bottom circuit board 15 are stacked on top of the base plate 11. The flexible circuit board 14 is stacked on top of the base plate 11 and can be directly electrically connected to an external power source or to the internal circuit board 13 within the base plate 11. The flexible circuit board 14 is equipped with multiple sensors 17 and a control chip. The sensors 17 can be used to sense the position of the carrier 2.

[0051] The bottom circuit board 15 is stacked on top of the flexible circuit board 14 and electrically connected to it. The bottom circuit board 15 also houses a bottom coil. Furthermore, the top surface of the base plate 11 is provided with positioning posts 114. Both the flexible circuit board 14 and the bottom circuit board 15 have positioning holes that fit over the positioning posts 114. The positioning posts 114 can be sequentially passed through the positioning holes of the flexible circuit board 14 and into the positioning holes of the bottom circuit board 15, facilitating the positioning and connection of the flexible circuit board 14 and the bottom circuit board 15 to the base plate 11.

[0052] The housing 3 covers the outside of the two side panels 12 and is located on the top surface of the bottom panel 11, and is clamped with the two side panels 12. In addition, the housing 3 can also be connected to the base 1 by other means, such as bolts, bonding, magnetism, etc., and the specific connection method of the housing 3 and the base 1 is not limited.

[0053] The carrier 2 is mounted on the top surface of the bottom plate 11 and is located in the housing 3. Figure 6 and Figure 7 As shown, the carrier 2 is movable between the two side plates 12. The carrier 2 is provided with a lens mounting hole 27, which is used to mount a lens. Figure 6 and Figure 7In the embodiment, carrier 2 is generally rectangular, with lens mounting holes 27 extending through carrier 2 along opposite sides. A relief hole is provided on the side of housing 3 opposite lens mounting hole 27, positioned opposite lens mounting hole 27 to provide light shielding. It should be understood that the present invention is not limited to a specific shape of carrier 2; carrier 2 may also be spherical or any other shape.

[0054] The other two opposing sides of the carrier 2 are positioned opposite the two side circuit boards 16 and are each provided with a side mounting slot 21. A side magnet 23 is mounted in each side mounting slot 21. The two side magnets 23 cooperate with the side coils within the two side circuit boards 16 to drive the carrier 2 along the optical axis, thereby adjusting the lens focal length.

[0055] The bottom of the carrier 2 is provided with a plurality of bottom mounting slots 22, arranged in two rows, with the two rows of bottom mounting slots 22 located near both sides of the carrier 2. A bottom magnet 24 is mounted in each bottom mounting slot 22. The multiple bottom magnets 24 cooperate with the bottom coils within the bottom circuit board 15 to drive the carrier 2 to move perpendicular to the optical axis, thereby achieving an anti-shake function.

[0056] In addition, in order to make the side magnets 23 and the bottom magnets 24 more stably connected to the carrier 2, a metal sheet 28 is also embedded inside the carrier 2. The metal sheet 28 includes two bottom metal sheets 281 and two side metal sheets 282. The two bottom metal sheets 281 are respectively embedded in the bottom of the carrier 2 and located above the bottom mounting groove 22. The two bottom metal sheets 281 respectively correspond to the bottom magnets 24 in the two rows of bottom mounting grooves 22, and are used to attract the bottom magnets 24 in the two rows of bottom mounting grooves 22 and enhance the magnetic field strength of the bottom magnets 24.

[0057] The two side metal sheets 282 are integrally formed with the two bottom metal sheets 281 and are arranged approximately perpendicular to the bottom metal sheets 281. The two side metal sheets 282 correspond to the side magnets 23 in the two side mounting grooves 21, respectively, and are used to attract the side magnets 23 and enhance the strength of the side magnets 23. During processing, the metal sheet 28 can be placed as a whole in a mold and embedded in the interior of the carrier 2 by injection molding. This facilitates processing and allows the metal sheet 28 to be very firmly installed in the interior of the carrier 2. The side metal sheets 282 and the bottom metal sheet 281 are integrally formed and arranged perpendicularly, which can restrict each other's movement, so that the entire metal sheet 28 can be stably embedded in a preset position in the interior of the carrier 2, thereby making the side magnets 23 and the bottom magnet 24 more stably connected to the carrier 2.

[0058] Each of the four reeds 4 is formed from a flexible, bent spring wire. They are connected to the top of the carrier 2 and to the top ends of the four suspension wires 5. The bottom ends of the four suspension wires 5 are connected to the top surface of the base plate 11. When the carrier 2 moves along the optical axis or perpendicular to the optical axis, it pulls on the four reeds 4, causing them to stretch. This stretching generates a reverse force on the carrier 2, thereby resetting it.

[0059] The bottom of the carrier 2 is provided with four bumps 25. These bumps 25 are located above the four shoulders 111 of the base plate 11 and are connected to the damping colloid 113 within the four shoulders 111. The damping colloid 113 has viscoelastic properties. When the carrier 2 moves, the damping colloid 113 stabilizes the movement of the carrier 2 and assists the reed 4 in driving the carrier 2 to reposition stably. It should be understood that the top surface of the base plate 11 may be provided with only three or more shoulders 111, and the bottom of the carrier 2 may be provided with three or more bumps 25 corresponding to the three shoulders 111, respectively, or with a corresponding number of bumps 25. The specific number of shoulders 111 and bumps 25 is not limited.

[0060] As a preferred embodiment, the bottom surface of the bump 25 can be provided with a curved surface or multiple strip-shaped protrusions 26 to increase the contact area with the damping colloid 113, thereby increasing the connection strength between the bump 25 and the damping colloid 113. Furthermore, the multiple protrusions 26 can also be provided with a spike-like structure, which can penetrate into the damping colloid 113, also increasing the connection strength between the bump 25 and the damping colloid 113.

[0061] In the lens driving device 100 of the present invention, a metal sheet 28 is embedded inside the carrier 2. The metal sheet 28 can enhance the connection stability between the side magnets 23 and the bottom magnet 24 and the carrier 2. In addition, a bump 25 is provided at the bottom of the carrier 2. The bump 25 is connected to the damping colloid 113 of the base 1, and a protrusion 26 is provided on the bottom surface of the bump 25. The multiple protrusions 26 can increase the connection strength between the bump 25 and the damping colloid 113, thereby enhancing the stability of the movement of the carrier 2.

[0062] While preferred embodiments of the present invention have been described in detail above, 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.

[0063] 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 construed as limited to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0064] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that 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 device, characterized in that: include: A base, comprising: a bottom plate, wherein the bottom plate is provided with a bottom coil; two side panels, the two side panels being spaced apart and connected to the top surface of the bottom panel; and Two side circuit boards, the two side circuit boards are respectively connected to the two side plates and are respectively provided with side coils; A carrier, wherein the carrier can be movably mounted on the top surface of the bottom plate and located between the two side plates, side mounting grooves are respectively provided on both sides of the carrier, two side magnets are respectively located in the two side mounting grooves, and the side magnets cooperate with the side coils to drive the carrier to move along the optical axis; a plurality of bottom mounting grooves are provided at the bottom of the carrier, two groups of bottom magnets are located in the bottom mounting grooves; the bottom magnets cooperate with the bottom coils to drive the carrier to move in a direction perpendicular to the optical axis; a plurality of reeds connected to the top of the carrier; and A plurality of suspension wires, wherein the bottom ends of the plurality of suspension wires are respectively connected to the bottom plate, and the top ends of the plurality of suspension wires are respectively connected to the plurality of reeds; A metal sheet is provided inside the carrier, and the metal sheet includes: Two bottom metal sheets, the two bottom metal sheets are embedded in the bottom of the carrier and correspond to the two groups of bottom magnets respectively, and the bottom metal sheets are used to attract the bottom magnets; and Two side metal sheets, the bottom ends of the two side metal sheets are respectively integrally formed with the two bottom metal sheets and are arranged vertically to restrict each other's movement; the top ends of the two side metal sheets extend away from the bottom metal sheet and respectively correspond to the two side magnets, and the side metal sheets are used to attract the side magnets.

2. The lens driving device according to claim 1, wherein: The top surface of the bottom plate is provided with a plurality of shoulders, the top surface of the shoulders is provided with grooves, and a damping colloid is provided in the grooves; the bottom of the carrier is provided with a plurality of bumps, and the plurality of bumps are respectively located above the plurality of shoulders and respectively connected to the plurality of damping colloids.

3. The lens driving device according to claim 2, wherein: The bottom surface of the convex block is a curved surface or is provided with a convexity.

4. The lens driving device according to claim 1, wherein: A built-in circuit is provided in the base, and the built-in circuit extends into the side panel and is electrically connected to the side circuit board.

5. The lens driving device according to claim 4, wherein: The built-in circuit extends beyond the top surface of the side plate and is electrically connected to the side circuit board.

6. The lens driving device according to claim 1, wherein: The base further includes a flexible circuit board and a sensor. The flexible circuit board is stacked on the top surface of the bottom plate, and the sensor is connected to the flexible circuit board.

7. The lens driving device according to claim 6, wherein: The base further includes a bottom circuit board, which is stacked on the top surface of the flexible circuit board, and the bottom coil is arranged in the bottom circuit board.

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