Lens drive device, base and circuit board thereof

Abstract

The present invention discloses a lens driving device, a base, and a circuit board. The circuit board includes a base plate, a plurality of first positioning members, a multi-layer metal sheet, and a multi-layer coil. The base plate has a center hole, the plurality of first positioning members are connected to the top surface of the base plate, and the multi-layer metal sheets are sequentially stacked on the top surface of the base plate along the axis of the center hole. The multi-layer coils are respectively mounted on the multi-layer metal sheets, each layer of coils includes a plurality of coils, and each layer of coils is respectively mounted on a corresponding layer of metal sheets, and two adjacent layers of coils along the axis are electrically connected, and each coil is arranged around at least one first positioning member. During the process of manufacturing the circuit board, and then in the process of sequentially connecting the multi-layer metal sheets to the top surface of the base plate, the plurality of coils can be firstly placed on the corresponding first positioning members, so that the metal sheets can be smoothly stacked on the top surface of the base. The plurality of first positioning members provide positioning for the multi-layer metal sheets, which can keep the shapes of the plurality of coils stable, thereby accurately controlling the displacement of the lens movement.

Description

Technical Field

[0001] The present invention relates to the field of optical driving, and in particular to a lens driving device, a base and a circuit board. Background Art

[0002] With the development of technology, many electronic devices 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 thinner designs to provide users with more choices.

[0003] In practice, in order to adapt to various shooting scenes, the lens needs to be constantly focused. In the prior art, a lens driving device is generally used to drive the lens to move in three directions, namely, along the optical axis and in two mutually perpendicular directions perpendicular to the optical axis. Specifically, the lens driving device includes a housing, a frame, a carrier, an upper spring, a lower spring, and a base, wherein the housing and the base cooperate to provide a accommodating space for installing the frame and the carrier, the frame is provided with multiple sets of magnets, the carrier is used to install the lens, and the carrier is provided with a set of coils for cooperating with the magnets on the frame to drive the carrier and the lens to move along the optical axis, and the carrier is installed in the hollow structure of the frame, and the base generally includes a circuit board and a base body, and the circuit board is provided with two sets of coils for cooperating with the magnets on the frame to drive the carrier and the lens to move along the two mutually perpendicular directions perpendicular to the optical axis.

[0004] The circuit board consists of a base plate, a multi-layer metal sheet, and a multi-layer coil. The multi-layer coil is mounted on the multi-layer metal sheet. The multi-layer metal sheet is stacked along the axis of the base plate's central hole to the top surface of the base plate, and the multi-layer coil is also stacked along this axis. However, the multi-layer coil is prone to misalignment during use, and it is not easy to align the multi-layer coil along the axis during the manufacturing process of the multi-layer metal sheet, making processing difficult and time-consuming. Summary of the Invention

[0005] The object of the present invention is to provide a lens driving device, a base and a circuit board to solve the problems existing in the above-mentioned prior art.

[0006] In order to solve the above problem, according to one aspect of the present invention, a circuit board is provided, which is applied to a lens driving device and includes:

[0007] a bottom plate, the bottom plate having a central hole, the central hole having a central axis;

[0008] a plurality of first positioning members, the plurality of positioning members being connected to the top surface of the bottom plate and extending in a direction parallel to the central axis;

[0009] Multiple layers of metal sheets, the multiple layers of metal sheets being stacked sequentially on the top surface of the bottom plate in a direction parallel to the central axis; and

[0010] The multi-layer coil comprises a plurality of coils on each layer, and each layer of the coils is respectively installed on a corresponding layer of the metal sheet, wherein the coils on two adjacent layers are electrically connected, and each coil is arranged around at least one of the first positioning members.

[0011] In one embodiment, each of the coils is disposed around at least two first positioning members that are spaced apart from each other.

[0012] In one embodiment, each layer of coils includes two pairs of opposing coils, and each pair of opposing coils is spaced apart via the central hole.

[0013] In one embodiment, the two pairs of opposite coils are respectively located at two pairs of opposite edges of the metal sheet; preferably, the first positioning members are arranged at both ends of the coils in the extension direction of the edges; preferably, the bottom plate and the metal sheet have the same shape.

[0014] In one embodiment, the circuit board further includes a second positioning member, and the second positioning member is located between the coil and the center hole.

[0015] In one embodiment, the second positioning member is disposed opposite to the corresponding first positioning member across the coil.

[0016] In one embodiment, the second positioning members are divided into a plurality of groups, and each group of the second positioning members includes two second positioning members arranged together.

[0017] In one embodiment, the two pairs of opposite coils are respectively located at two pairs of opposite edges of the metal sheet, and the second positioning member is close to two ends of the coils in the extending direction of the edges.

[0018] In one embodiment, the first positioning member is made of a magnetically conductive metal.

[0019] In one embodiment, the second positioning member is made of a magnetically conductive metal.

[0020] The present invention also relates to a base, which is applied to a lens driving device and comprises:

[0021] A base body, wherein the base body is provided with a metal frame;

[0022] The above-mentioned circuit board is stacked and connected to the top surface of the base body, and the plurality of coils are electrically connected to the metal frame.

[0023] The present invention also relates to a lens driving device, comprising:

[0024] case;

[0025] The base is connected to the bottom of the housing and cooperates with the housing to form a receiving space;

[0026] a frame having a hollow structure and mounted in the accommodating space, wherein an internal circuit is embedded in the frame and the frame is further provided with a magnet, wherein the magnet is used to cooperate with the plurality of coils in the circuit board to drive the frame to move in a direction perpendicular to the optical axis of the lens driving device;

[0027] a carrier, the carrier being movably mounted in the hollow structure of the frame, and having another set of coils disposed on the carrier, the other set of coils being configured to cooperate with the magnets on the frame to drive the carrier to move along the optical axis of the lens driving device;

[0028] an upper spring connecting the frame and the top of the carrier, elastically connecting the frame and the carrier, and electrically connecting the internal circuit of the frame;

[0029] a lower spring connecting the frame and the bottom of the carrier, electrically connecting the internal circuit and the coil on the carrier, and elastically connecting the frame and the carrier;

[0030] A suspension wire, one end of which is connected to the metal frame, and the other end of which is connected to the upper spring.

[0031] The present invention provides a plurality of first positioning members on the bottom plate of the circuit board. When the multiple layers of metal sheets are sequentially connected and stacked on the top surface of the bottom plate, the multiple coils can be firstly placed on the corresponding first positioning members, so that the metal sheets can be smoothly stacked on the top surface of the base. The multiple first positioning members provide positioning for the multiple layers of metal sheets, facilitating the processing of the circuit board, and can also keep the shapes of the multiple coils stable, so that the multiple coils generate a more stable magnetic field. The multiple coils cooperate with the multiple magnets to accurately control the displacement of the lens moving in a direction perpendicular to the optical axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. 1 is an exploded view of a lens driving device according to an embodiment of the present invention.

[0033] Figure 2 It is a three-dimensional view of a base according to an embodiment of the present invention.

[0034] Figure 3 FIG. 1 is a perspective view of a circuit board according to an embodiment of the present invention.

[0035] Figure 4 It is a top view of a multi-layer metal sheet, a multi-layer coil, a plurality of first positioning members, and a bottom plate according to an embodiment of the present invention.

[0036] Figure 5 It is a three-dimensional diagram of a multi-layer metal sheet, a multi-layer coil, a plurality of first positioning members, and a bottom plate according to an embodiment of the present invention.

[0037] Figure numerals: 100, lens driving device; 1, housing; 2, base; 21, base body; 22, circuit board; 221, bottom plate; 222, center hole; 223a, first positioning member; 223b, second positioning member; 224, coil; 225, suspension wire avoidance portion; 3, frame; 31, magnet; 4, carrier; 5, upper spring leaf; 6, lower spring leaf; 7, suspension wire. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Figure 1This is a perspective exploded view of a lens drive mechanism according to an embodiment of the present invention. In one embodiment, the lens drive mechanism includes a housing 1, a base 2, a carrier 4, a frame 3, an upper spring 5, and a lower spring. The housing 1 and the base 2 cooperate to form a housing space for accommodating the carrier 4, the frame 3, the upper spring 5, the lower spring, and the suspension wire 7. It should be noted that the chamber here can be an open space or a closed space, and can have a regular or irregular shape, which is not limited herein. The frame 3 has a hollow structure and is installed in the housing space. The frame 3 is embedded with internal circuitry and is also provided with multiple sets of magnets 31. The carrier 4 is used to mount the lens and is wound with a coil 224, which is arranged in the hollow structure of the frame 3. The coil 224 on the carrier 4 cooperates with a set of magnets 31 on the frame 3 to drive the carrier 4 to move along the optical axis to achieve the optical zoom function.

[0043] The lower spring 5 movably connects the frame 3 and the lower surface of the carrier 4, while the upper spring 5 movably connects the frame 3 and the upper surface of the carrier 4. This allows the carrier 4 to be reset after moving relative to the frame 3. Furthermore, the upper spring 5 is electrically connected to the internal circuitry of the frame 3 for powering the internal circuitry, while the lower spring 5 electrically connects the internal circuitry within the frame 3 and the coil 224 on the carrier 4, elastically connecting the frame 3 and the carrier 4.

[0044] The base 2 includes a base body 21 and a circuit board 22. Figure 2 As shown, the base body 21 is a rectangular frame with a metal frame inside, which can be electrically connected to an external power source. A suspension wire 7 is connected to the metal frame at one end and to the upper spring 5 at the other. Current from the base 2 metal frame can flow through the suspension wire 7, the upper spring 5, the internal circuitry of the frame 3, and the lower yellow plate 6 to the coil 224 on the carrier 4. A circuit board 22 is superimposed on and connected to the top surface of the base body 21. A multilayer coil 224 is also internally mounted on the circuit board 22, which is also electrically connected to the metal frame inside the base 2. This metal frame supplies power to the multilayer coil 224, allowing the multilayer coil 224 to cooperate with the additional magnet 31 on the frame 3 to drive the carrier 4 and the lens mounted thereon to move perpendicular to the optical axis.

[0045] Figure 3 、 Figure 4 or Figure 5Figure 2 is a schematic diagram of a circuit board 22 according to an embodiment of the present invention. The circuit board 22 comprises a base plate 221, a plurality of first positioning members 223a, a multi-layer metal sheet, and a multi-layer coil 224. The base plate 221 has a central hole 222 with a central axis. The central hole 222 and the central structure of the frame 3 are aligned along the optical axis, providing a channel for light transmission through the lens. The plurality of first positioning members 223a are used to position and install the multi-layer coil 224. The multi-layer metal sheet is used to mount the chip and provide support for the multi-layer coil 224. Specifically, multiple first positioning members 223a are connected to the top surface of the base plate 221 and extend along the central axis parallel to the center hole 22, and the multi-layer metal sheets are stacked in sequence on the top surface of the base plate 221 along the axial direction of the center hole 222, and the multi-layer coils 224 are respectively installed on the multi-layer metal sheets. Each layer of coils 224 includes multiple coils 224, and each layer of coils 224 is respectively installed on a corresponding layer of metal sheets, and the two adjacent layers of coils 224 are electrically connected along the axial direction, and each coil 224 is arranged around at least one first positioning member 223a.

[0046] During the manufacturing process of the circuit board 22, the metal sheet is first connected to the top surface of the base plate 221, and then the multiple layers of metal sheets are connected in sequence and stacked on the top surface of the base plate 221. In the process of stacking the multiple layers of metal sheets, the multiple coils 224 can be first looped on the corresponding first positioning members 223a, so that the metal sheets can be smoothly stacked on the top surface of the base 2. The multiple first positioning members 223a provide positioning for the multiple layers of metal sheets, which facilitates the processing of the circuit board 22, and can also keep the shapes of the multiple coils 224 stable, so that the multiple coils 224 generate a more stable magnetic field, and through the cooperation of the multiple coils 224 with the multiple magnets 31, the displacement of the lens moving in the direction perpendicular to the optical axis can be accurately controlled.

[0047] Optionally, the base plate 221 and the metal sheet are both roughly rectangular and of the same size, and the metal sheet is thin, and multiple layers of metal sheets are stacked to form a single metal plate. Furthermore, the base plate 221 and the metal sheet can also be designed in other shapes, such as triangles, hexagons, squares, or circles, as long as they can fit the housing 1 and frame 3 and drive the carrier 4 to move. The shapes of the base plate 221 and the metal sheet are not limited herein.

[0048] Optionally, each layer of coils 224 includes four coils 224, and the four coils 224 are respectively located at the four edges of the metal sheet, and the coils of the two pairs of opposite coils 224 are respectively located at the opposite edges of the metal sheet. The four coils 224 of the multi-layer metal sheet are respectively aligned along the central axis direction of the center hole 222. The multiple coils 224 of the multi-layer metal sheet are divided into two groups, and the coils 224 located on opposite sides of the metal sheet form a group. One group of coils 224 is used to cooperate with the two magnets 31 on the frame 3 to drive the carrier 4 to move along the X-axis direction perpendicular to the optical axis, and the other group of coils 224 is used to cooperate with the other two magnets 31 on the frame 3 to drive the carrier 4 to move along the Y-axis direction, where the X-axis and Y-axis are both perpendicular to the optical axis direction. In addition, the axial direction of the center hole 222 is consistent with the optical axis direction of the lens. It should be understood that the technology in this field can arbitrarily set the base plate 221 and the metal sheet into other shapes, as long as the first positioning member 223a can be installed in the coil 224 and the shape and magnetic field of the coil 224 are stable. The shapes of the base plate 221 and the metal sheet are not limited here.

[0049] It should be noted that the position of the coil 224 in the circuit board 22 and the magnetic field formed by the coil 224 need to be designed in accordance with the magnet 31 on the frame 3. Figure 1 and Figure 3 as well as Figure 4 In the embodiment, the magnet group includes three magnets 31 and is respectively arranged on three sides of the frame, wherein the two opposing magnets correspond to the two opposing coils 224 of the present invention, one group is used to drive the carrier 4 to move toward the X-axis direction, and the other group is used to drive the carrier 4 toward the Y-axis direction.

[0050] Optionally, each coil 224 is arranged around two first positioning members 223a. The two first positioning members 223a strengthen the support for the coil 224 and prevent the coil 224 from sinking inward or moving outward. Placing the first positioning members 223a within the coil 224 not only facilitates positioning and processing of the circuit board 22, but also stabilizes the shape of the coil 224, thereby stabilizing the magnetic field of the coil 224, so that the coil of the circuit board 22 cooperates with the magnet 41 of the frame 4 to more precisely control the movement of the carrier 4 and the lens in a direction perpendicular to the optical axis. It should be understood that each coil 224 can also be wound around a longer first positioning member 223a, or can be wound around more first positioning members 223a, such as three, four, five, or eight, and the number of first positioning members 223a within the coil 224 is not limited here.

[0051] Furthermore, the two first positioning members 223a extend in the direction in which the corresponding edges extend, and the two ends of the two first positioning members 223a are spaced apart. Figure 4 and Figure 5As shown, the bottom plate 221 and the metal sheet are both rectangular and have four edges facing each other, and the four coils correspond to the edges of the bottom plate 221 and the metal sheet respectively. When the four coils 224 are rectangular circles, the rectangular circles are parallel to the extension of the edges, and the two first positioning members 223a are parallel to the extension direction of the corresponding edges. Each coil 224 is wound around the two first positioning members 223a, so that the magnetic field formed by the coil 224 is distributed over each edge, and the two first positioning members 223a are located in the rectangular circle and parallel to the length direction of the rectangular circle. The two first positioning members 223a are respectively close to the two ends of the rectangular circle, thereby fixing the overall shape of the coil 224.

[0052] Optionally, a second positioning member 223b is further provided on the base plate 221. The second positioning member 223b is located between the coil 224 and the center hole 222 to prevent the coil 224 from moving toward the center hole 222, thereby preventing misalignment and causing magnetic field disturbance. It should be understood that multiple second positioning members 223b may also be provided between the coil 224 and the hollow hole 222. As long as there is sufficient space between the coil 224 and the center hole 222 and the magnetic field of the coil 224 is not affected, the present invention does not limit the number of first positioning members 223a. In addition, the second positioning member 223b may also be omitted. The single first positioning member 223a also serves to secure the coil 2234.

[0053] Furthermore, the second positioning member 223b is arranged opposite to the coil corresponding to the first positioning member 223a. The second positioning member 223b and the first positioning member 223a can fix the coil 224 and prevent the coil 224 from moving.

[0054] Optionally, the second positioning members 223b are divided into multiple groups, each group of second positioning members 223b includes two second positioning members 223b, and the second positioning members 223b are respectively close to the two ends of the extension direction of the corresponding edge of the coil 224. Specifically, Figure 4 and Figure 5 As shown, multiple sets of second positioning members 223b are located on one side of the rectangular ring close to the center hole 222, and near both ends of the rectangular ring, to prevent the ends of the rectangular ring from moving toward the center hole 222. Preferably, the second positioning members 223b are symmetrically arranged along the long sides of the rectangular ring, so that the magnetic fields at both ends of the rectangular ring are symmetrical and consistent, thereby cooperating with the first positioning members 223a inside the rectangular ring to stabilize the magnetic field of the rectangular ring.

[0055] Optionally, multiple groups of second positioning members 223b extend along the extension direction of the corresponding edge and are arranged perpendicular to the extension direction of the corresponding edge. The second positioning members 223b are parallel to the length direction of the rectangular ring, which can support the coil 224 to the maximum extent, and the two coils 224 are arranged at intervals perpendicular to the length direction of the rectangular ring, which can strengthen the support for the rectangular ring. Figure 4 and Figure 5 In the embodiment, the two opposing teams of coils 224 are respectively located at opposite edges of the metal sheet, and the second positioning members 223 are close to both ends of the coils 224 along the extending direction of the edge.

[0056] Optionally, the first positioning member 223a and the second positioning member 223b may be magnetically conductive, i.e., they may be magnetic metal strips made of a magnetically conductive metal. The magnetic metal strips may not only strengthen the magnetic field of the multiple coils 224 but also stabilize the magnetic field of the multiple coils 224. It should be noted that the first positioning member 223a and the second positioning member 223b may also be made of a non-magnetic metal, such as plastic, as long as they can position and install multiple layers of metal sheets and maintain the shape of the multiple coils 224. The material of the first positioning member 223a and the second positioning member 223b is not limited herein.

[0057] Optionally, a top plate is also included, such as Figure 3 As shown, the top plate covers and is connected to the top of the multi-layer metal sheet along the axial direction. The top plate and the bottom plate 221 are respectively located at the top and bottom of the multi-layer metal sheet to protect the multi-layer metal sheet and prevent the multi-layer metal sheet from being worn. It can also prevent the multiple coils 224 from being bumped during movement, thereby causing the coils 224 to wear and age, thereby avoiding reducing the service life of the lens driving device 100.

[0058] It should also be noted that the four corners of the multi-layer metal sheet are provided with suspension wire avoidance portions 225. The multi-layer metal sheet is installed on the top surface of the bottom plate 221. The four suspension wire avoidance portions 225 can facilitate the connection of the suspension wire 7 to the metal frame inside the base body 21.

[0059] The present invention sets multiple first positioning members 223a on the bottom plate 221 of the circuit board 22. In the process of connecting the multiple layers of metal sheets in sequence and stacking them on the top surface of the bottom plate 221, the multiple coils 224 can be first looped on the corresponding first positioning members 223a, so that the metal sheets can be smoothly stacked on the top surface of the base 2. The multiple first positioning members 223a provide positioning for the multiple layers of metal sheets, which facilitates the processing of the circuit board 22, and can also keep the shapes of the multiple coils 224 stable, so that the multiple coils 224 generate a more stable magnetic field, and through the multiple coils 224 and the multiple magnets 31, the displacement of the lens moving in the direction perpendicular to the optical axis can be accurately controlled.

[0060] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A circuit board, which is used in a lens driving device, characterized in that: include: A bottom plate, the bottom plate having a central hole, the central hole having a central axis, and the central hole is used to provide a channel for the lens to transmit light; a plurality of first positioning members, the plurality of positioning members being connected to the top surface of the bottom plate and extending in a direction parallel to the central axis; Multiple layers of metal sheets, wherein the multiple layers of metal sheets are sequentially stacked on the top surface of the bottom plate in a direction parallel to the central axis; as well as a multi-layer coil, each layer of the coil comprising a plurality of coils, and each layer of the coils being mounted on a corresponding layer of the metal sheet, wherein the coils of two adjacent layers are electrically connected, and each of the coils is disposed around at least one of the first positioning members; Each of the coils is arranged around at least two first positioning members spaced apart from each other; each layer of the coils includes two pairs of opposing coils, and each pair of opposing coils is spaced apart via the central hole.

2. The circuit board according to claim 1, wherein: The two pairs of opposite coils are respectively located at two pairs of opposite edges of the metal sheet.

3. The circuit board according to claim 2, wherein: The first positioning members are arranged at both ends of the coil in an extending direction of the edge.

4. The circuit board according to claim 1, wherein: The bottom plate and the metal sheet have the same shape.

5. The circuit board according to claim 1, wherein: The circuit board further includes a second positioning member, which is located between the coil and the center hole.

6. The circuit board according to claim 5, characterized in that The second positioning member is disposed opposite to the corresponding first positioning member via the coil.

7. The circuit board according to claim 5, characterized in that The second positioning members are divided into a plurality of groups, and each group of the second positioning members includes two second positioning members arranged together.

8. The circuit board according to claim 5, wherein: The two pairs of opposite coils are respectively located at two pairs of opposite edges of the metal sheet, and the second positioning members are close to two ends of the coils in the extending direction of the edges.

9. The circuit board according to claim 1, wherein: The first positioning member is made of magnetically conductive metal.

10. The circuit board according to claim 5, wherein: The second positioning member is made of magnetically conductive metal.

11. A base, applied to a lens driving device, characterized in that: include: A base body, wherein the base body is provided with a metal frame; The circuit board according to any one of claims 1 to 10 is stacked and connected to the top surface of the base body, and the plurality of coils are electrically connected to the metal frame.

12. A lens driving device, characterized in that: include: case; The base according to claim 11, wherein the base is connected to the bottom of the shell and cooperates with the shell to form a receiving space; a frame having a hollow structure and mounted in the accommodating space, wherein an internal circuit is embedded in the frame and the frame is further provided with a magnet, wherein the magnet is used to cooperate with the plurality of coils in the circuit board to drive the frame to move in a direction perpendicular to the optical axis of the lens driving device; a carrier, the carrier being movably mounted in the hollow structure of the frame, and having another set of coils disposed on the carrier, the other set of coils being configured to cooperate with the magnets on the frame to drive the carrier to move along the optical axis of the lens driving device; an upper spring connecting the frame and the top of the carrier, elastically connecting the frame and the carrier, and electrically connecting the internal circuit of the frame; a lower spring connecting the frame and the bottom of the carrier, electrically connecting the internal circuit and the coil on the carrier, and elastically connecting the frame and the carrier; A suspension wire, one end of which is connected to the metal frame, and the other end of which is connected to the upper spring.

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