Lens driving mechanism, lens driving device, photographic device, electronic equipment

Abstract

The present invention discloses a lens driving mechanism, a lens driving device, a photographic device, and an electronic device. The key points of the technical solution are as follows: a lens driving mechanism includes a housing, a base, and a frame connected to a driving body; a moving assembly is provided between the base and the frame, and the moving assembly includes at least three balls provided between the base and the frame, a receiving groove provided on the bottom surface of the frame and receiving the balls, and a movable groove provided on the base and allowing the balls to move relative to each other; an upper spring group and a lower spring group having potential energy for driving the frame to move toward the base are provided between the frame and the base, and the upper spring group and the lower spring group are provided at both ends of the frame. The present invention achieves stable support for the frame through three balls, realizes translation of the frame, and generates potential energy for driving the frame to move toward the base by creating a height difference between the installation positions of the upper spring group and the lower spring group, ensuring that the balls are located in the receiving groove, effectively preventing the balls from falling off, and improving assembly reliability.

Description

Technical Field

[0001] The present invention relates to the field of photographic equipment, and in particular to a lens driving mechanism, a lens driving device, a photographic device, and an electronic device. Background Art

[0002] The optical image stabilization performance of the camera module of electronic equipment is attracting more and more attention. The anti-shake motor is an optical image stabilization device. The camera module is generally installed on the anti-shake motor. The anti-shake motor can effectively reduce the probability of blurry photos in low-light environments and reduce the inevitable shaking during video or photo shooting.

[0003] There are two main types of image stabilization motors available: shift OIS and tilt OIS. Depending on the structure, image stabilization motors can be divided into translation, axis-shift, and shape memory metal (SMA) types. The main structure of an image stabilization motor is the drive body and the lens drive mechanism.

[0004] The existing translation type anti-shake motor uses balls in its translation structure to drive the main body to move. However, during use, when vibrated or shaken, the balls are prone to fall off, causing the anti-shake motor to malfunction.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of the present invention is to provide a lens driving mechanism, a lens driving device, a photographic device, and an electronic device, which use three balls to stably support the frame and achieve translation of the frame. The height difference between the installation positions of the upper spring group and the lower spring group creates potential energy for driving the frame to move toward the base, ensuring that the balls are located in the accommodating grooves, effectively preventing the balls from falling off, and improving assembly reliability.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a lens drive mechanism comprising a housing, a base, and a frame connected to a drive body, wherein a moving assembly is disposed between the base and the frame, the moving assembly comprising at least three balls disposed between the base and the frame, a receiving groove provided on the bottom surface of the frame and accommodating the balls, and a movable groove provided on the base and allowing the balls to move relative to each other;

[0008] An upper spring group and a lower spring group with potential energy for driving the frame to move toward the base are arranged between the frame and the base, and the upper spring group and the lower spring group are arranged at both ends of the frame.

[0009] The present invention is further configured as follows: the upper spring group includes an inner group of upper springs arranged between the frame and the driving body, and an outer group of upper springs arranged between the end of the frame away from the bottom surface of the base and the base or the outer shell; the outer group of upper springs includes an upper inner fixing part connected to the end of the frame away from the bottom surface of the base, an upper outer fixing part connected to the inner wall of the base or the outer shell, and an upper cantilever arranged between the upper inner fixing part and the upper outer fixing part; there is a height difference between the installation positions of the upper inner fixing part and the upper outer fixing part, and the upper cantilever has potential energy to drive the frame to move toward the bottom surface of the base after being affected by the height difference.

[0010] The present invention is further configured as follows: the lower spring group includes two symmetrically arranged lower spring groups, the lower spring groups include a lower inner fixing part connected to the driving body, a lower middle fixing part connected to one end of the frame facing the bottom surface of the base, a lower outer fixing part connected to the base, a lower inner cantilever part arranged between the lower inner fixing part and the lower outer fixing part, and a lower outer cantilever part arranged between the lower middle fixing part and the lower outer fixing part; there is a height difference between the installation positions of the lower middle fixing part and the lower outer fixing part, and the upper cantilever has potential energy to drive the frame to move toward the bottom surface of the base after being affected by the height difference.

[0011] The present invention is further configured as follows: a driving component is provided between the frame and the base for driving the frame to move relative to the base, and the driving component includes four magnets provided on the four side walls of the frame, and four anti-shake coils connected to the base and corresponding to the magnets respectively.

[0012] The present invention is further configured as follows: the base is provided with two Hall elements located at adjacent side edges of the frame, and the Hall elements are located between the magnet and the bottom surface of the base.

[0013] The present invention is further configured as follows: brackets are provided at the four corners of the base, an FPC board is connected between the four brackets, and the anti-shake coil is fixed to the FPC board.

[0014] The present invention is further configured as follows: a lens driving device having the above-mentioned lens driving mechanism, further comprising a driving body connected to the frame, the driving body comprising a carrier arranged in the frame and movable relative to the frame, a driving coil arranged on the carrier and corresponding to the four magnets, the upper spring inner group being arranged between the end of the carrier facing away from the base and the frame, and the lower inner fixing portion being connected to the end of the carrier facing the base.

[0015] The present invention is further provided as follows: a photographic device having the above-mentioned lens driving device.

[0016] The present invention is further provided as follows: an electronic device having the above-mentioned camera device.

[0017] In summary, the present invention has the following beneficial effects:

[0018] Three ball bearings are used to stably support the frame, and the movement of the balls in the movable grooves allows the frame to be easily translated relative to the bottom surface, facilitating the shift OIS of the anti-shake motor. At the same time, the thickness of the anti-shake motor is effectively reduced through the accommodating grooves and the movable grooves.

[0019] The upper inner and outer fixings are not installed at the same level; the upper inner fixing is higher than the upper outer fixing. This height difference creates potential energy in the upper cantilever, driving the frame toward the base's underside. The potential energy stored in the upper outer spring group drives the frame toward the base's underside. The ball bearings support the frame, limiting its relative position and ensuring the ball remains within its slot, effectively preventing it from falling out and improving assembly reliability. The lower spring group achieves the same effect as the upper outer spring group, further enhancing assembly reliability.

[0020] The two Hall elements effectively sense the accuracy of the frame's translation, improving anti-shake performance. At the same time, the installation slots facilitate confirmation of the Hall element installation position, improving assembly convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an explosion diagram of Example 1;

[0022] Figure 2 This is a cross-sectional view of Example 1 Figure 1 , used to show the ball installation position;

[0023] Figure 3 This is a cross-sectional view of Example 1 Figure 2 , used to indicate the installation position of the Hall element;

[0024] Figure 4 is a schematic diagram of the installation positions of the upper spring assembly and the lower spring assembly in Example 1;

[0025] Figure 5 is a schematic diagram of the upper spring group;

[0026] Figure 6 is a schematic diagram of the lower spring group;

[0027] Figure 7 It is a schematic diagram of the explosion of Example 2.

[0028] The corresponding component names represented by the numbers in the figure are: 1. Base; 2. Frame; 3. Bracket; 4. FPC board; 5. Ball bearing; 6. Accommodation groove; 7. Movable groove; 8. Magnet; 9. Mounting groove; 10. Hall element; 11. Carrier; 12. Driving coil; 13. Upper spring inner group; 14. Upper spring outer group; 15. Upper inner fixing part; 16. Upper outer fixing part; 17. Upper cantilever; 18. Lower spring group; 19. Lower inner fixing part; 20. Lower middle fixing part; 21. Lower outer fixing part; 22. Lower inner cantilever part; 23. Lower outer cantilever part; 24. Anti-shake coil; 25. Housing. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to diagrams and specific embodiments.

[0030] Example 1: Figures 1 to 6 As shown, an anti-shake structure proposed in the present invention includes a shell 25, a base 1, and a frame 2 connected to a driving body. A moving component and a driving component are arranged between the base 1 and the frame 2. Brackets 3 are integrally formed at the four corners of the base 1, and an FPC board 4 is connected between the four brackets 3.

[0031] The moving assembly includes three balls 5 positioned between base 1 and frame 2; a receiving slot 6 on the bottom surface of frame 2 that accommodates the balls 5; and a movable slot 7 on base 1 that allows the balls 5 to move relative to the moving slot. The diameter of the movable slot 7 is larger than that of the balls 5, and the balls 5 are movable relative to the movable slot 7. The three balls 5 provide stable support for frame 2, and the movement of the balls 5 within the movable slot 7 facilitates translation of the frame 2 relative to the bottom surface, facilitating shift OIS (Optical Image Stabilization) motor. The receiving slot 6 and movable slot 7 also effectively reduce the thickness of the anti-shake motor.

[0032] The drive assembly includes four magnets 8 mounted on the four side walls of the frame 2, four anti-shake coils 24 connected to the base 1 and corresponding to the magnets 8, and the anti-shake coils 24 are fixed to the FPC board 4. When energized, these four coils interact with the magnets 8 to drive the frame 2 in translation, implementing the shift OIS function of the anti-shake motor. Furthermore, by directly fixing the anti-shake coils 24 to the FPC board 4, the size of the entire anti-shake motor can be effectively reduced.

[0033] An upper spring assembly and a lower spring assembly, each with the potential energy to drive the frame 2 toward the base 1, are disposed between the frame 2 and the base 1. The upper and lower spring assemblies are disposed at opposite ends of the frame 2. The upper spring assembly comprises an inner spring subassembly 13 (of the conventional structure) mounted between the frame 2 and the driving body, and an outer spring subassembly 14 mounted between the end of the frame 2 facing away from the bottom surface of the base 1 and the bracket 3. The outer spring subassembly 14 comprises an inner fixing portion 15 mounted on the end of the frame 2 facing away from the base 1, an outer fixing portion 16, and an upper cantilever 17 disposed between the inner fixing portion 15 and the outer fixing portion 16. The outer fixing portion 16 can be mounted on the bracket 3 or on the inner wall of the housing 25. In this embodiment, the inner wall of the housing 25 is selected for mounting. There are four upper external fixing parts 16 and four upper cantilever arms 17, each of which is mounted on a corresponding bracket 3 or the inner wall of the housing 25. There is a height difference between the connection position between the frame 2 and the upper internal fixing part 15 and the connection position between the inner wall of the housing 25 and the upper external fixing part 16. That is, the upper internal fixing part 15 and the upper external fixing part 16 are not installed at the same horizontal position. The upper internal fixing part 15 is higher than the upper external fixing part 16. As a result, the upper cantilever arms 17 have the potential energy to drive the frame 2 toward the bottom surface of the base 1 due to the height difference. Due to the potential energy of the upper spring outer group 14, the frame 2 has the potential energy to move toward the bottom surface of the base 1. Due to the support of the ball 5, the relative position of the frame 2 is limited. At the same time, the ball 5 can be ensured to be located in the receiving groove 6, effectively preventing the ball 5 from falling off and improving assembly reliability.

[0034] The lower spring assembly includes two symmetrically arranged lower spring subassemblies 18, each comprising a lower inner fixing portion 19 connected to the driving body, a lower middle fixing portion 20 connected to one end of the frame 2 facing the bottom surface of the base 1, a lower outer fixing portion 21 connected to the base 1, a lower inner cantilever portion 22 disposed between the lower inner fixing portion 19 and the lower outer fixing portion 21, and a lower outer cantilever portion 23 disposed between the lower middle fixing portion 20 and the lower outer fixing portion 21. The lower inner fixing portion 19, the lower inner cantilever portion 22, the lower outer cantilever portion 21, and the lower outer cantilever portion 23 are each provided in pairs, located at two adjacent corners of the frame 2. There is a height difference between the connection point between the frame 2 and the lower middle fixing portion 20 and the connection point between the base 1 and the lower outer fixing portion 21. The upper cantilever 17, affected by this height difference, has the potential energy to drive the frame 2 toward the bottom surface of the base 1. The lower spring assembly achieves the same effect as the upper outer spring subassembly 14, further improving assembly reliability.

[0035] To improve anti-shake accuracy, a Hall effect element 10 is mounted on the bottom surface of base 1. In this embodiment, two Hall effect elements 10 are provided, located at corresponding positions on adjacent sides of frame 2, and between magnet 8 and the bottom surface of base 1. Furthermore, base 1 defines mounting slots 9 for Hall effect elements 10. These two Hall effect elements 10 effectively sense the translational accuracy of frame 2, improving anti-shake performance. Mounting slots 9 also facilitate confirmation of the installation position of Hall effect elements 10, enhancing assembly convenience.

[0036] Example 2: A lens driving device, such as Figure 7 As shown, the lens drive mechanism of Example 1 further includes a drive body connected to the frame 2. The drive body includes a carrier 11 disposed within the frame 2 and movable relative to the frame 2, and a drive coil 12 disposed on the carrier 11 and corresponding to the four magnets 8. An upper spring inner subassembly 13 is disposed between the end of the carrier 11 facing away from the base 1 and the frame 2, and a lower spring inner fixed portion is connected to the end of the carrier 11 facing the base 1.

[0037] Example 3: A photographic device having the lens driving device described in Example 2.

[0038] Example 4: An electronic device having the camera device described in Example 3.

[0039] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description, and therefore should not be understood as limiting the present invention.

[0040] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0041] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A lens driving mechanism, comprising a housing (25), a base (1), and a frame (2) connected to a driving body, characterized in that: A moving assembly is provided between the base (1) and the frame (2), the moving assembly comprising at least three balls (5) provided between the base (1) and the frame (2), a receiving groove (6) provided on the bottom surface of the frame (2) and accommodating the balls (5), and a movable groove (7) provided on the base (1) and allowing the balls (5) to move relatively. An upper spring group and a lower spring group having potential energy for driving the frame (2) to move toward the base (1) are provided between the frame (2) and the base (1); the upper spring group and the lower spring group are provided at both ends of the frame (2); The upper spring group comprises an upper spring inner group (13) arranged between the frame (2) and the driving body, an upper spring outer group (14) arranged between the end of the frame (2) away from the bottom surface of the base (1) and the base (1), the upper spring outer group (14) comprises an upper inner fixing portion (15) connected to the end of the frame (2) away from the bottom surface of the base (1), an upper outer fixing portion (16) connected to the base (1), and an upper cantilever (17) arranged between the upper inner fixing portion (15) and the upper outer fixing portion (16), there is a height difference between the installation positions of the upper inner fixing portion (15) and the upper outer fixing portion (16), and the upper cantilever (17) has potential energy to drive the frame (2) to move toward the bottom surface of the base (1) after being affected by the height difference; Brackets (3) are provided at the four corners of the base (1), an FPC board (4) is connected between the four brackets (3), and an anti-shake coil (24) is fixed to the FPC board (4); The upper external fixing portion (16) is mounted on the bracket (3).

2. The lens driving mechanism according to claim 1, wherein: The lower spring assembly comprises two symmetrically arranged lower spring groups (18), wherein the lower spring group (18) comprises a lower inner fixing portion (19) connected to the driving body, a lower middle fixing portion (20) connected to one end of the frame (2) facing the bottom surface of the base (1), a lower outer fixing portion (21) connected to the base (1), a lower inner cantilever portion (22) arranged between the lower inner fixing portion (19) and the lower outer fixing portion (21), and a lower outer cantilever portion (23) arranged between the lower middle fixing portion (20) and the lower outer fixing portion (21); a height difference exists between the installation positions of the lower middle fixing portion (20) and the lower outer fixing portion (21), and the lower outer cantilever portion (23) has potential energy to drive the frame (2) to move toward the bottom surface of the base (1) due to the height difference.

3. The lens driving mechanism according to claim 1, wherein: A driving assembly for driving the frame (2) to move relative to the base (1) is provided between the frame (2) and the base (1), and the driving assembly includes a magnet (8) provided on a side wall of the frame (2), and anti-shake coils (24) connected to the base (1) and corresponding to the magnet (8).

4. The lens driving mechanism according to claim 3, wherein: The base (1) is provided with two Hall elements (10) located at adjacent side edges of the frame (2), and the Hall elements (10) are located between the magnet (8) and the bottom surface of the base (1).

5. A lens driving device, characterized in that: The lens driving mechanism according to any one of claims 3 further comprises a driving body connected to the frame (2), the driving body comprising a carrier (11) arranged in the frame (2) and movable relative to the frame (2), a driving coil (12) arranged on the carrier (11) and corresponding to the four magnets (8), an upper spring inner group (13) arranged between an end of the carrier (11) facing away from the base (1) and the frame (2), and a lower inner fixing portion (19) connected to an end of the carrier (11) facing the base (1).

6. A photographic device, characterized in that: A lens driving device according to claim 5 is provided.

7. An electronic device, characterized in that: A photographic device according to claim 6.

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