Lens driving mechanism and base thereof

Abstract

The application discloses a lens driving mechanism and a base thereof. The lens driving mechanism comprises a frame and a plurality of circuit boards. The frame is provided with a magnet on the side thereof. Each of the circuit boards is arranged at the bottom of one side of the frame and is internally provided with a set of coils. Two ends of the coil are arranged at two ends of the circuit board respectively and form a first power supply pin and a second power supply pin at the two ends of the circuit board respectively to supply power to the coil. The base is provided with an upper surface facing the frame and a lower surface away from the frame. The upper surface is provided with a plurality of partition structures. Each of the circuit boards is arranged between and limited by at least two of the partition structures. The unique matching design of the plurality of circuit boards and the base can realize more stable combination of the circuit boards and the base and has stronger versatility, saves processing cost and has wide commercial application prospect.

Description

Technical Field

[0001] This invention relates to the field of optical imaging, and more specifically to a lens driving mechanism and its base. Background Technology

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

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

[0004] like Figure 1 As shown, these lens drive modules typically include a circuit board, which usually has a shape that matches the base and is mounted on the base, for example, in a roughly rectangular structure, with a set of coils on each of the four sides of the rectangular structure, for example... Figure 1 The circuit board contains four coils built into its front, back, left, and right sides. When energized, these coils interact with magnets above them, driving the magnets and the frame on which they are mounted to move in the X and Y directions. Four energizing pins are located on the inner edge of the circuit board, energizing two oppositely positioned coils. However, when this circuit board is mounted on a base, gaps often appear at the bottom, resulting in instability. Furthermore, different sized coils are required for different frame sizes, leading to poor versatility. Summary of the Invention

[0005] The purpose of this invention is to provide a lens driving mechanism and its base to solve the problems existing in the prior art.

[0006] To address the aforementioned problems, according to one aspect of the present invention, a base for a lens driving mechanism is provided. The lens driving mechanism includes a frame and a plurality of circuit boards. Magnets are provided on the sides of the frame. Each circuit board is disposed at the bottom of one side of the frame and contains a set of coils. The two ends of the coils are respectively arranged at the two ends of the circuit boards, and a first energizing pin and a second energizing pin are respectively formed at the two ends of the circuit boards to energize the coils. The base has an upper surface facing the frame and a lower surface away from the frame. The upper surface is provided with a plurality of partition structures. Each circuit board is arranged between at least two of the partition structures and is limited by at least two of the partition structures.

[0007] In one embodiment, the base has a rectangular structure and a through hole in the middle for engaging with a lens, and a plurality of circuit board mounting portions are formed around the through hole, with at least one partition structure formed between each pair of adjacent circuit board mounting portions.

[0008] In one embodiment, the partition structure includes a main partition extending in a straight line, wherein one end of the main partition extends to the periphery of the through hole and the extension line passes through the center of the through hole, and the extension line of the other end of the main partition passes through the corner of the base.

[0009] In one embodiment, the partition structure further includes a "U"-shaped auxiliary partition disposed at the corner of the base, wherein each of the circuit boards has a notch at the corner and the notches of each two adjacent circuit boards are combined to form a "U"-shaped notch that cooperates with the "U"-shaped auxiliary partition.

[0010] In one embodiment, the base has an embedded metal sheet, and each circuit board mounting part has two circuit interfaces. The two pins of the circuit board are electrically connected to the embedded metal sheet through the two circuit interfaces.

[0011] In one embodiment, the upper surface of the base is provided with four circuit board mounting portions on average for mounting four circuit boards.

[0012] In one embodiment, the upper surface of the base is provided with three circuit board mounting portions on average for mounting three circuit boards.

[0013] In one embodiment, the upper surface of the base is provided with two circuit board mounting portions on average for mounting two circuit boards.

[0014] According to another aspect of the present invention, a lens driving mechanism is also provided, the lens driving mechanism comprising a housing, a frame, a base, a carrier, and four circuit boards, the housing and the base cooperating to form a cavity, the carrier for mounting a lens and disposed within the frame, the frame disposed within the cavity and having at least one magnet on each of the four sides, the four circuit boards disposed on the base and respectively arranged below the four sides of the bottom of the frame, wherein each circuit board contains a set of coils, the two ends of the set of coils are respectively arranged at the two ends of the circuit board and a first energizing pin and a second energizing pin are respectively formed at the two ends of the circuit board to energize the coils, and the base has an upper surface facing the frame and a lower surface away from the frame, the upper surface having a plurality of partition structures, each circuit board being disposed between two partition structures and limited by the two partition structures.

[0015] In one embodiment, the base is the base described in the above embodiments.

[0016] This invention, through a unique design that integrates multiple circuit boards with a base, enables a more stable connection between the circuit boards and the base while also providing greater versatility, saving processing costs, and has broad commercial application prospects. Attached Figure Description

[0017] Figure 1 This is a planar schematic diagram of a flat coil in the prior art.

[0018] Figure 2 This is an exploded perspective view of a lens driving mechanism according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A 3D layout diagram of the four circuit boards.

[0020] Figure 4 This is a perspective view of the base according to an embodiment of the present invention.

[0021] Figure 5 This is a front view of the base according to an embodiment of the present invention.

[0022] Figure 6 This is a plan view of the three circuit boards of a lens driving mechanism according to an embodiment of the present invention. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0024] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0025] 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.

[0026] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0027] This invention relates to a lens driving mechanism and its base, which can be used in devices such as mobile phones, tablets, and laptops.

[0028] Figure 2 This is an exploded perspective view of the lens driving mechanism 100 according to the first embodiment of the present invention. Figure 3 yes Figure 2 A 3D layout diagram of the four circuit boards in the diagram. Figure 4 This is a perspective view of the base according to an embodiment of the present invention. Figure 5 This is a front view of the base according to an embodiment of the present invention, as shown below. Figure 2-5 As shown, the lens drive mechanism 100 includes a frame 10, a base 20, a carrier 30, and four circuit boards 40. The carrier 30 is used to mount the lens and is disposed within the frame 10. At least one magnet 11 is provided at the bottom of each of the four sides of the frame 10. The four circuit boards 40 are disposed on the base 20 and respectively arranged below the four sides of the frame 10. The base 20 has an upper surface 21 facing the frame 10 and a lower surface 22 away from the frame. The upper surface 21 is provided with multiple partition structures 211. Each circuit board 40 is arranged between two partition structures 211 and limited by the two partition structures 211. Each circuit board 40 has a set of coils built in, and the two ends of this set of coils are respectively arranged at the two ends of the circuit board, forming a first energizing pin and a second energizing pin at the two ends of the circuit board to energize the coil. After the coil is energized, it forms an electromagnetic induction with the magnet and is subjected to the Lorentz force in the magnetic field, thereby driving the magnet and thus driving the frame and carrier on which the magnet is mounted to move, thereby realizing the optical image stabilization function and / or optical zoom function.

[0029] It should be noted that the coil of the present invention mainly refers to a multi-turn coil formed by winding a single wire. For example, it can be formed by winding a single wire to form a circular, elliptical, roughly rectangular, or roughly square shape, and then connecting the turns one by one from the inside out.

[0030] Continue to refer to Figure 2Optionally, the lens drive mechanism 100 further includes a housing 60, an upper spring 70, a lower spring 80, and a suspension wire 90. The housing 80 and the base 20 cooperate to form a receiving chamber. The carrier 30 is disposed within the frame 10. The upper spring 70 movably connects the upper surface of the frame 10 to the upper surface of the carrier 30, and the lower spring 90 movably connects the lower surface of the frame 10 to the lower surface of the carrier 30. The lower end of the suspension wire 90 is connected to the base 20, and the upper end of the suspension wire 90 is connected to the upper spring 70. Thus, the metal sheet embedded in the base and the upper spring, and then the carrier coil on the carrier, can be electrically connected via the suspension wire to power the coil. Optical zoom is achieved by driving the carrier along the optical axis through the cooperation of the magnet 11 mounted on the side of the frame 10 and the carrier coil, and optical image stabilization is achieved by driving the carrier frame along the horizontal direction through the cooperation of the magnet 11 mounted on the side of the frame 10 and the coil on the circuit board.

[0031] It should be noted that the carrier of this invention may also omit the coil, thus achieving optical image stabilization solely through the interaction between the magnet and the coil on the circuit board. Therefore, the suspension wire can be omitted, or other methods such as ball bearings can be used instead.

[0032] like Figure 3 As shown, four circuit boards 40 are combined to form a roughly rectangular circuit board that corresponds exactly to the four sides of the frame. It can be seen that a single circuit board of this invention represents less than a quarter of the structure in the prior art, and it contains a coil with two energizing pins at each end to power the coil. This circuit board can be combined as needed, which can save on the material used for the flat coil to a certain extent, thereby reducing costs. The combined circuit board is shown below. Figure 3 As shown, its specific rotation direction can be adjusted according to the usage. Compared with existing circuit boards, it not only uses less material and has lower cost, but also has greater versatility.

[0033] like Figure 4 As shown, with Figure 3 Corresponding to the circuit board, the base 20 has a rectangular structure and a through hole 23 in the middle that cooperates with the lens. The through hole 23 is preferably a circular through hole. Four circuit board mounting parts 231 are formed around the through hole 23, and at least one partition structure 211 is formed between each pair of adjacent circuit board mounting parts 231. Figure 3 The four circuit boards 40 shown are respectively mounted on four circuit board mounting parts 231, and each circuit board 40 is just limited on the circuit board mounting part 231 by two partition structures 211 on both sides, which prevents the circuit board from shifting on the plane perpendicular to the optical axis. At the same time, it also plays a positioning role during the installation process, ensuring installation accuracy and improving installation efficiency.

[0034] Optionally, the partition structure 211 includes a main partition 212 extending in a straight line and a U-shaped auxiliary partition 213 disposed at the corner of the base. One end of the main partition 212 extends to a circular through-hole 23, and the extension line of the main partition preferably passes through the center of the circular through-hole. The other end of the main partition 212 extends towards the corner of the base, and its extension line passes through the corner of the base. That is, the main partition 212 extends radially along a circle, and its extension line passes through the corner of the base. Figure 4 As can be seen, optionally, four main partitions 212 are evenly arranged on the upper surface of the base, with each pair of main partitions at approximately a 90-degree angle to each other.

[0035] The “U”-shaped auxiliary partition 213 is located at the corner of the base 20 and connected to the main partition 212. Specifically, the “U”-shaped auxiliary partition 213 includes a bottom 2131 and two side portions 2132 extending from both ends of the bottom 2131 to the sides. The two side portions 2132 form an angle greater than 90 degrees with the bottom 2131 and extend to the edge of the base. One end of the main partition 212 extends to the periphery of the circular through hole, and the other end of the main partition 212 extends to the “U”-shaped bottom 2131 of the auxiliary partition 213. Correspondingly, each circuit board 40 has a notch 41 at its corner, and the notches 41 of each two adjacent circuit boards combine to form a “U”-shaped notch 42 that cooperates with the “U”-shaped auxiliary partition. When the circuit board 40 is mounted on the base 20, each circuit board is positioned between two main partitions 212 and limited at the corners by two auxiliary partitions 213. Thus, each circuit board 40 is confined and limited on its sides by the main partitions 212 and auxiliary partitions 213. Furthermore, because the two main partitions form an angle of approximately 90 degrees, and the two sides of the circuit board are not parallel, the circuit board 40 has a roughly fan-shaped shape, wider on the outside and narrower on the inside. Therefore, even though there are no partitions limiting the circuit board on the side of the through-hole in the base and on the edge opposite the through-hole, the circuit board 40 will not shift in the inward or outward direction. It can be seen that through the special shape design of the circuit board and the specially shaped partitions on the base, the circuit board's displacement is restricted in a plane perpendicular to the optical axis (i.e., a plane parallel to the base), preventing the circuit board from moving freely on the base.

[0036] Continue to refer to Figure 4-5 In one embodiment, the base 20 is provided with a base embedded metal sheet 50, which is set inside the base 20 during the base casting process. Each circuit board mounting part 231 is provided with two circuit interfaces 232. The two pins of each circuit board 40 are electrically connected to the base embedded metal sheet 50 through the two circuit interfaces 232 respectively. The circuit interface 232 can be formed, for example, by opening a hole in the base so that the base embedded metal sheet is exposed to the upper surface of the base.

[0037] Optionally, refer to Figure 3 In one embodiment, the circuit board 40 has an outer surface 43 facing outwards from the lens driving mechanism and an inner surface 44 facing inwards from the lens driving mechanism. The outer surface 44 is flat, and the inner surface 43 is curved. This design ensures that the outer surface of the circuit board is parallel to the edge of the base, and also ensures that when multiple circuit boards are arranged in a ring, they can form a circular internal space to mate with the circular through-hole 23 of the base. Figure 3-4 The situation shown in the figure.

[0038] It should be noted that although each lens driving mechanism in the above embodiments includes four circuit boards and four circuit board mounting parts are correspondingly provided on the base, in other embodiments, each lens driving mechanism may include more or less than four circuit boards. For example, three circuit boards or two circuit boards may be provided. In this case, three circuit board mounting parts or two circuit board mounting parts are also provided on the base accordingly.

[0039] For example, Figure 6 This is a plan view of the three circuit boards of the lens driving mechanism according to the second embodiment of the present invention, as shown below. Figure 6 As shown, the lens driving mechanism of this embodiment differs from the lens driving mechanism 100 described above in the shape of the frame and the number of circuit boards 40. Specifically, the lens driving mechanism of this embodiment includes a frame 10, a base 20, a carrier 30, and three circuit boards 40. The carrier 30 is used to mount the lens and is disposed within the frame 10. The frame 10 has three sides arranged in a triangular pattern when projected onto the base. At least one magnet 11 is provided at the bottom of each of the three sides. The three circuit boards 40 are disposed on the base 20 and respectively arranged below the three sides of the frame 10. Each circuit board 40 contains a set of coils, with the two ends of the coils respectively arranged at the two ends of the circuit board 40, forming a first energizing pin and a second energizing pin at the two ends of the circuit board 40 to energize the coils. In this embodiment, corresponding to the number of circuit boards 40, three circuit board mounting parts are also provided on the base. Each circuit board mounting part is separated by a partition structure, which limits the position of each circuit board.

[0040] According to a third embodiment of the present invention, similar to the lens driving mechanism 100 of the first embodiment, the lens driving mechanism of the third embodiment may further include a frame 10, a base 20, a carrier 30, and two circuit boards. The carrier 30 is used to mount the lens and is disposed within the frame. At least one magnet is provided at the bottom of each of the four sides of the frame. The two circuit boards are disposed on the base and configured such that each circuit board is arranged below two sides of the frame. Each circuit board has two sets of coils built in and is respectively arranged below one side of the frame to cooperate with the magnets at the bottom of the frame and drive the magnets and the frame to move when energized. In this embodiment, corresponding to the number of circuit boards 40, two circuit board mounting parts are also provided on the base. Each circuit board mounting part is separated by a partition structure and limits the movement of each circuit board.

[0041] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A base for a lens driving mechanism, the lens driving mechanism comprising a frame and a plurality of circuit boards, wherein a magnet is provided on the side of the frame, each circuit board is respectively disposed at the bottom of one side of the frame and contains a set of coils, the two ends of the coils are respectively arranged at the two ends of the circuit boards, and a first energizing pin and a second energizing pin are respectively formed at the two ends of the circuit boards to energize the coils, characterized in that, The base has an upper surface facing the frame and a lower surface away from the frame. The upper surface is provided with a plurality of partition structures, and each circuit board is arranged between at least two of the partition structures and is limited by at least two of the partition structures.

2. The base according to claim 1, characterized in that, The base has a rectangular structure and a through hole in the middle for mate with the lens. Multiple circuit board mounting parts are formed around the through hole, and at least one partition structure is formed between each pair of adjacent circuit board mounting parts.

3. The base according to claim 2, characterized in that, The partition structure includes a main partition extending in a straight line, wherein one end of the main partition extends to the periphery of the through hole and the extension line passes through the center of the through hole, and the extension line of the other end of the main partition passes through the corner of the base.

4. The base according to claim 1, characterized in that, The partition structure also includes a "U"-shaped auxiliary partition disposed at the corner of the base. Each of the circuit boards has a notch at the corner, and the notches of each two adjacent circuit boards are combined to form a "U"-shaped notch that cooperates with the "U"-shaped auxiliary partition.

5. The base according to claim 2, characterized in that, The base has an embedded metal plate, and each circuit board mounting part has two circuit interfaces. The two pins of the circuit board are electrically connected to the embedded metal plate in the base through the two circuit interfaces.

6. The base according to claim 2, characterized in that, The upper surface of the base is provided with four circuit board mounting parts on average for mounting four circuit boards.

7. The base according to claim 2, characterized in that, The upper surface of the base is provided with three circuit board mounting parts on average for mounting three circuit boards.

8. The base according to claim 2, characterized in that, The upper surface of the base is provided with two circuit board mounting parts on average for mounting two circuit boards.

9. A lens driving mechanism, characterized in that, The lens driving mechanism includes a housing, a frame, a base, a carrier, and four circuit boards. The housing and the base cooperate to form a cavity. The carrier is used to mount the lens and is disposed within the frame. The frame is disposed within the cavity and has at least one magnet on each of its four sides. The four circuit boards are disposed on the base and are respectively arranged below the four sides of the bottom of the frame. Each circuit board contains a set of coils. The two ends of the set of coils are respectively arranged at the two ends of the circuit board, and a first energizing pin and a second energizing pin are respectively formed at the two ends of the circuit board to energize the coils. The base has an upper surface facing the frame and a lower surface away from the frame. The upper surface is provided with multiple partition structures. Each circuit board is disposed between two partition structures and is limited by the two partition structures.

10. The lens driving mechanism according to claim 9, characterized in that, The base is the base as described in any one of claims 1-5.

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