Variable aperture, camera module and electronic equipment

Abstract

The invention relates to a variable aperture, a camera module and electronic equipment. The variable aperture comprises a base, at least two piezoelectric actuators, a rotary moving part, at least two aperture blades, a limiting frame and a magnetic attraction assembly. The magnetic attraction assembly comprises at least two permanent magnets which are symmetrically embedded in the bottom of the limiting frame, and a non-contact gap is formed between the bottom surface of each permanent magnet and the upper surface of the base; axial magnetic attraction force generated between the permanent magnet and the base is transmitted through the limiting frame to form axial pressing force on the rotating moving piece, and the friction contact interface is made to maintain preset contact pressure. A pre-pressure control system adopts a non-contact magnetic pre-tightening force mechanism, a traditional mechanical spring is replaced by non-contact magnetic attraction force between the permanent magnet and the magnetic conductive alloy base so as to achieve axial pressing force on the rotating moving part, and the magnetic pre-tightening force type permanent magnet pre-tightening force device has the advantages of being stable in pre-pressure control, small in size, light in weight, free of magnetic interference, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of imaging, and more particularly to a variable aperture, an imaging module, and an electronic device. Background Art

[0002] In the field of traditional piezoelectric drive technology, a shrapnel structure is usually adopted to provide the required pre-pressure between the moving part and the piezoelectric block to ensure the normal operation and performance of the piezoelectric drive device. However, when such traditional piezoelectric drive technology is applied to mobile terminal devices such as mobile phones, due to the fact that these devices need to undergo a series of strict environmental tests in the actual use environment, such as drop tests, micro-drop tests, drum tests, and vibration tests, etc., the limitations of the shrapnel structure become prominent. During these severe tests, the shrapnel is extremely prone to deformation, resulting in a change in the pre-pressure. The instability of the pre-pressure will seriously affect the performance of the piezoelectric drive, and may even cause the entire drive system to fail, thereby affecting the normal use and function realization of mobile terminal devices such as mobile phones. Therefore, how to provide a more stable and reliable piezoelectric drive technology in the mobile phone application scenario to overcome the problem of unstable pre-pressure caused by the traditional shrapnel structure has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0003] In view of this, the present invention provides a variable aperture to solve the above problem of unstable pre-pressure.

[0004] The object of the present invention is achieved by the following technical solutions: A variable aperture includes a base, at least two piezoelectric actuators, a rotating moving part, at least two aperture blades, a limiting frame, and a magnetic attraction assembly.

[0005] The base is made of a magnetically conductive alloy material.

[0006] At least two piezoelectric actuators are fixedly installed on the upper surface of the base, and the piezoelectric actuator has a driving boss protruding upward.

[0007] The rotating moving part has a friction contact interface with the driving boss on its bottom surface, and the rotating moving part is configured to be rotatable about a vertical axis perpendicular to the base.

[0008] At least two aperture blades are circumferentially distributed and are linked and cooperated with the rotating moving part.

[0009] The limiting frame is coaxially sleeved on the outer periphery of the rotating moving part, and a guiding chute structure matching the outer periphery of the rotating moving part is provided on the inner peripheral surface of the limiting frame.

[0010] The magnetic attraction assembly includes at least two permanent magnets symmetrically embedded at the bottom of the limiting frame, and a non-contact gap is formed between the bottom surface of each permanent magnet and the upper surface of the base.

[0011] Among them, the axial magnetic suction force generated between the permanent magnet and the base is transmitted through the limiting frame to form an axial pressing force on the rotating moving part, so as to maintain a preset contact pressure at the friction contact interface.

[0012] This variable aperture has the advantages of stable pre-pressure control, miniaturization and light weight, no magnetic interference, low cost, etc.

[0013] Stable pre-pressure control: The pre-pressure control system of the variable aperture adopts a non-contact magnetic pre-tightening force mechanism. Through the non-contact magnetic suction force between the permanent magnet and the magnetically conductive alloy base, it replaces the traditional mechanical spring (shrapnel) to achieve the axial pressing force on the rotating moving part. During the product development process, this magnetic pre-tightening force system can flexibly adjust the magnitude of the magnetic suction force according to actual needs, so as to accurately control the preset contact pressure. The pre-pressure is provided by the magnetic suction force, and the magnetic suction force can be adjusted by changing the magnetic energy product or size of the magnetic attracting magnet. During the environmental test (environmental test), due to the non-contact characteristic of the magnetic suction force, this system will not deform like a shrapnel due to external force impact, thus ensuring the stability of the pre-pressure. During the actual use stage of the product, in the face of complex environmental impacts, such as the dropping and vibration during the daily use of mobile phones, this system can always maintain the precise control of the pre-pressure, effectively avoiding the problems of piezoelectric drive efficiency reduction or working failure caused by the change of the pre-pressure, and significantly improving the reliability and stability of the variable aperture.

[0014] Miniaturization and light weight: The variable aperture of the present invention realizes miniaturization and light weight in the structural design. Its design is compact and reasonable, and the layout of each component is tight and there is no redundancy. By adopting a non-contact magnetic pre-tightening force system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the volume and weight of the entire device, and achieving the design goals of miniaturization and light weight. This makes its application in mobile devices (such as mobile phones) with strict requirements for space and weight more convenient, provides greater flexibility and freedom for the overall design of the device, and at the same time meets the aesthetic and usage needs of modern consumers for thin, light and portable electronic devices.

[0015] No magnetic interference: In the design, the magnetic suction force between the permanent magnet and the magnetically conductive alloy base of the present invention has high directivity and concentration. The magnetic force lines mainly form a closed loop in the non-contact gap between the permanent magnet and the base, and will not generate magnetic interference to other surrounding electronic components. This characteristic is of great significance in a complex electronic device environment (such as a mobile phone), and can effectively avoid various problems such as signal interference and data transmission errors caused by magnetic interference, ensure the stable operation of the entire device system, and improve the reliability and performance of the device.

[0016] Low cost: From the perspective of cost, the variable aperture of the present invention has a significant low-cost advantage. On the one hand, its structure is relatively simplified, reducing the processing and assembly difficulties of complex mechanical structures, thereby reducing the manufacturing cost. On the other hand, the costs of permanent magnets and magnetically permeable alloy materials are relatively stable and have high cost performance in large-scale production.

[0017] Preferably, the number of the piezoelectric actuators is three, which are evenly distributed along the circumferential direction of the base, and the central angle between adjacent piezoelectric actuators is 120° ± 2°.

[0018] The variable aperture of the present invention also has the advantage of low-voltage drive. Compared with traditional variable apertures, this design can be driven at a lower voltage. This characteristic is mainly attributed to its efficient energy conversion mechanism and optimized structural design, enabling the piezoelectric actuator to generate sufficient driving force at a lower voltage, thereby driving the rotating moving part and the aperture blades to achieve precise motion control, realizing the characteristics of long stroke and large thrust. Low-voltage drive not only helps reduce energy consumption and extend the service time of the device, but also meets the requirements of modern electronic devices for energy conservation and environmental protection, having significant advantages. In addition, due to its low-voltage drive characteristic, the requirements for the power supply system are correspondingly reduced, further reducing the overall cost. These factors combined make the variable aperture have strong price competitiveness in the market competition, which is conducive to its popularization and application in a wider range of application fields.

[0019] Preferably, the number of the permanent magnets is three, which are evenly distributed along the circumferential direction of the limiting frame, and the central angle between adjacent permanent magnets is 120° ± 2°.

[0020] This design makes the magnetic suction force evenly distributed in the circumferential direction, thereby ensuring that the rotating moving part is evenly stressed during the movement process and avoiding movement deviation caused by uneven stress. In addition, the evenly distributed permanent magnets can effectively reduce magnetic interference, improving the stability and reliability of the system. By precisely controlling the central angle between adjacent permanent magnets, the distribution of the magnetic suction force can be further optimized to ensure a stable pre-pressure under different working conditions.

[0021] Preferably, the guiding chute structure includes a first chute arranged on the inner peripheral surface of the limiting frame and in an arc shape, at least one second chute arranged on the outer peripheral surface of the rotating moving part and in an arc shape, and a plurality of balls rolling between the first chute and the second chute.

[0022] This guiding chute structure design can effectively reduce the friction between the rotating moving part and the limiting frame, improving the smoothness and accuracy of the movement. The rolling setting of the balls not only reduces the frictional resistance but also extends the service life of the equipment. In addition, the combination of the arc-shaped first chute and the arc-shaped second chute can ensure that the rotating moving part always maintains an accurate trajectory during the movement, avoiding movement deviation caused by improper chute design.

[0023] Preferably, the number of the first chutes and the second chutes is three, which are evenly distributed along the circumferential direction of the rotating moving part, and several of the balls are arranged in each first chute.

[0024] This design makes the balls evenly distributed in the circumferential direction of the rotating moving part, further reducing the frictional resistance and improving the smoothness and accuracy of the movement. The setting of multiple balls can effectively disperse the force, avoiding wear or damage caused by excessive force on a single ball. In addition, the evenly distributed first chutes and second chutes can also ensure the balanced force of the rotating moving part during the movement, avoiding movement deviation caused by uneven force, thereby improving the stability and reliability of the entire system.

[0025] Preferably, the cross-sections of the first chutes and the second chutes are of a V-shaped structure or a square structure.

[0026] This V-shaped structure or square structure design can effectively guide the movement trajectory of the balls, ensuring the stability and accuracy of the balls when rolling in the chutes. The optimized design of the V-shaped opening angle can reduce the contact stress between the balls and the chutes, reduce wear, and extend the service life. In addition, the optimized ratio of the ball diameter to the curvature radius of the V-shaped groove bottom can further improve the matching accuracy between the balls and the chutes, reducing movement deviation caused by improper matching, thereby improving the movement accuracy and reliability of the entire system.

[0027] Preferably, the limiting frame is provided with at least one anti-rotation positioning post, and the rotating moving part is correspondingly provided with a limiting groove that has a clearance fit with the anti-rotation positioning post.

[0028] This design can effectively prevent the rotating moving part from accidentally rotating during the movement, ensuring the accurate adjustment of the aperture. The clearance fit design between the anti-rotation positioning post and the limiting groove not only improves the flexibility of assembly but also ensures the stability during the movement. In addition, this design can also effectively reduce the movement deviation caused by assembly errors, improving the accuracy and reliability of the entire system.

[0029] Preferably, the three piezoelectric actuators are connected in parallel to the printed circuit board, and the printed circuit board is installed on the base.

[0030] This design can effectively improve the driving efficiency of the piezoelectric actuator, ensuring that sufficient driving force can still be generated under low voltage. The piezoelectric actuators connected in parallel can achieve more precise motion control and improve the accuracy of aperture adjustment. In addition, the design of mounting the printed circuit board on the base not only facilitates the integration and management of the circuit, but also improves the stability and reliability of the entire system. This design can also effectively reduce energy consumption and extend the usage time of the device, meeting the requirements of modern electronic devices for energy conservation and environmental protection.

[0031] Another implementation of the present invention is a camera module, including a lens assembly and the variable aperture described above. The variable aperture is connected to the lens assembly and is located on the light incident side of the lens assembly.

[0032] Another implementation of the present invention is an electronic device, including a device housing and the camera module described above. The camera module is disposed in the housing.

[0033] The beneficial effects of the present invention compared with the prior art are as follows: The variable aperture of the present invention has the advantages of stable pre-pressure control, miniaturization and light weight, no magnetic interference, low cost, etc.

[0034] Stable pre-pressure control: The pre-pressure control system of the variable aperture adopts a non-contact magnetic pre-tightening force mechanism. Through the non-contact magnetic attraction force between the permanent magnet and the magnetically conductive alloy base, it replaces the traditional mechanical spring (shrapnel) to achieve the axial pressing force on the rotating moving part. During the product development process, this magnetic pre-tightening force system can flexibly adjust the magnitude of the magnetic attraction force according to actual needs, so as to precisely control the preset contact pressure. The pre-pressure is provided by the magnetic attraction force, and the magnetic attraction force can be adjusted by changing the magnetic energy product or size of the magnetic attracting magnet. When conducting environmental tests (environmental tests), due to the non-contact characteristic of the magnetic attraction force, this system will not deform like a shrapnel when subjected to external force impacts, thus ensuring the stability of the pre-pressure. During the actual use stage of the product, in the face of complex environmental impacts, such as dropping and vibration during the daily use of a mobile phone, this system can always maintain precise control of the pre-pressure, effectively avoiding problems such as reduction in piezoelectric drive efficiency or work failure caused by changes in pre-pressure, and significantly improving the reliability and stability of the variable aperture.

[0035] Miniaturization and Lightweight: The variable aperture of the present invention achieves miniaturization and lightweight in its structural design. Its design is compact and reasonable, with the layout of each component being tight and without redundancy. By adopting a non-contact magnetic preloading force system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the volume and weight of the entire device and achieving the design goals of miniaturization and lightweight. This makes its application in mobile devices (such as mobile phones) with strict requirements for space and weight more convenient, provides greater flexibility and freedom for the overall design of the device, and also meets the aesthetic and usage needs of modern consumers for thin, light, and portable electronic devices.

[0036] Magnetic Interference Free: In terms of design, the magnetic attraction force between the permanent magnet and the magnetically permeable alloy base of the present invention has high directivity and concentration. The magnetic field lines mainly form a closed loop in the non-contact gap between the permanent magnet and the base, and will not generate magnetic interference to other surrounding electronic components. This characteristic is of great significance in a complex electronic device environment (such as a mobile phone), and can effectively avoid various problems such as signal interference and data transmission errors caused by magnetic interference, ensuring the stable operation of the entire device system and improving the reliability and performance of the device.

[0037] Low Cost: From the perspective of cost, the variable aperture of the present invention has significant low-cost advantages. On the one hand, its structure is relatively simplified, reducing the processing and assembly difficulty of complex mechanical structures, thereby reducing the manufacturing cost. On the other hand, the costs of permanent magnets and magnetically permeable alloy materials are relatively stable, and have high cost performance in large-scale production. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a structural diagram of the variable aperture according to an embodiment of the present invention.

[0040] Figure 2 It is a partial exploded view of the variable aperture according to an embodiment of the present invention.

[0041] Figure 3 It is a partial exploded view of the variable aperture from another perspective according to an embodiment of the present invention.

[0042] Figure 4 It is a cross-sectional view of the variable aperture according to an embodiment of the present invention.

[0043] Label Description 10: Base 20: Piezoelectric actuator 21: Driving boss (piezoelectric actuator component) 30: Rotating member 31: Frictional contact interface (contact part between rotating member and driving boss) 40: Aperture blade 50: Limiting frame 60: Guide chute structure (including first chute 61, second chute 62, and ball 63) 61: First chute (arc-shaped, provided on the limiting frame) 62: Second chute (arc-shaped, provided on the rotating member) 63: Ball (rolling component between chutes) 70: Magnetic attraction assembly (including permanent magnet 71, non-contact gap 72) 71: Permanent magnet 72: Non-contact gap (distance between permanent magnet and base) 80: Anti-rotation positioning post (limiting frame component) 81: Limiting groove (mating part of rotating member) 90: Printed circuit board (connector of piezoelectric actuator) Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Generally, the components of the embodiments of this application described and illustrated herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without making creative efforts fall within the scope of protection of this application.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0047] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0048] The technical solutions in the present application will be described below with reference to the drawings.

[0049] This embodiment provides a variable aperture, including a base 10, at least two piezoelectric actuators 20, a rotating member 30, at least two aperture blades 40, a limiting frame 50, and a magnetic attraction assembly 70.

[0050] The base 10 is made of a magnetically conductive alloy material.

[0051] At least two piezoelectric actuators 20 are fixedly installed on the upper surface of the base 10. The piezoelectric actuator 20 has a driving boss 21 that protrudes upward.

[0052] The rotating member 30 has a friction contact interface 31 formed with the driving boss 21 on its bottom surface. The rotating member 30 is configured to be rotatable about a vertical axis perpendicular to the base 10.

[0053] At least two aperture blades 40 are circumferentially distributed and are linked and cooperated with the rotating member 30.

[0054] The limiting frame 50 is coaxially sleeved on the outer periphery of the rotating member 30. The inner peripheral surface of the limiting frame 50 is provided with a guiding chute structure 60 that cooperates with the outer periphery of the rotating member 30.

[0055] The magnetic attraction assembly 70 includes at least two permanent magnets 71 symmetrically embedded in the bottom of the limiting frame 50. The bottom surface of each permanent magnet 71 forms a non-contact gap 72 with the upper surface of the base 10.

[0056] Among them, the axial magnetic attraction force generated between the permanent magnet 71 and the base 10 is transmitted through the limiting frame 50 to form an axial pressing force on the rotating member 30, so as to maintain a preset contact pressure on the friction contact interface 31.

[0057] This variable aperture has the advantages of stable pre-pressure control, miniaturization and light weight, no magnetic interference, and low cost.

[0058] Stable pre-pressure control: The pre-pressure control system of the variable aperture adopts a non-contact magnetic pre-tightening force mechanism. Through the non-contact magnetic attraction between the permanent magnet 71 and the magnetic conductive alloy base 10, it replaces the traditional mechanical spring (shrapnel) to achieve the axial pressing force on the rotating moving part 30. During the product development process, this magnetic pre-tightening force system can flexibly adjust the magnitude of the magnetic attraction according to actual needs, thereby precisely controlling the preset contact pressure. The pre-pressure is provided by the magnetic attraction, and the magnetic attraction can be adjusted by changing the magnetic energy product or size of the magnetic attracting magnet. When conducting environmental tests (environmental testing), due to the non-contact characteristic of the magnetic attraction, this system will not deform like a shrapnel when subjected to external force impacts, thus ensuring the stability of the pre-pressure. During the actual use stage of the product, in the face of complex environmental impacts, such as dropping and vibration during the daily use of a mobile phone, this system can always maintain precise control of the pre-pressure, effectively avoiding problems such as the reduction of piezoelectric drive efficiency or work failure caused by changes in the pre-pressure, and significantly improving the reliability and stability of the variable aperture.

[0059] Miniaturization and light weight: The variable aperture of the present invention realizes miniaturization and light weight in its structural design. Its design is compact and reasonable, and the layout of each component is tight without redundancy. By adopting a non-contact magnetic pre-tightening force system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the volume and weight of the entire device, and achieving the design goals of miniaturization and light weight. This makes its application in mobile devices (such as mobile phones) with strict requirements for space and weight more convenient, provides greater flexibility and freedom for the overall design of the device, and at the same time meets the aesthetic and usage needs of modern consumers for thin, light, and portable electronic devices.

[0060] No magnetic interference: In terms of design, the magnetic attraction between the permanent magnet 71 and the magnetic conductive alloy base 10 of the present invention has high directionality and concentration. The magnetic lines of force mainly form a closed loop in the non-contact gap 72 between the permanent magnet 71 and the base 10, and will not generate magnetic interference to other surrounding electronic components. This characteristic is of great significance in a complex electronic device environment (such as a mobile phone), and can effectively avoid various problems such as signal interference and data transmission errors caused by magnetic interference, ensuring the stable operation of the entire device system and improving the reliability and performance of the device.

[0061] Low cost: From the perspective of cost, the variable aperture of the present invention has significant low-cost advantages. On the one hand, its structure is relatively simplified, reducing the processing and assembly difficulty of complex mechanical structures, thereby reducing the manufacturing cost. On the other hand, the costs of the permanent magnet 71 and the magnetic conductive alloy material are relatively stable, and have high cost performance in large-scale production.

[0062] In this embodiment, the number of piezoelectric actuators 20 is three, which are evenly distributed along the circumferential direction of the base 10, and the central angle between adjacent piezoelectric actuators 20 is 120° ± 2°.

[0063] The variable aperture of the present invention also has the advantage of low-voltage drive. Compared with traditional variable apertures, this design can achieve drive at a lower voltage. This characteristic is mainly attributed to its efficient energy conversion mechanism and optimized structural design, enabling the piezoelectric actuator 20 to generate sufficient driving force at a lower voltage, thereby driving the rotating member 30 and the aperture blades 40 to achieve precise motion control. Low-voltage drive not only helps reduce energy consumption and extend the service time of the device, but also meets the requirements of modern electronic devices for energy conservation and environmental protection, having significant advantages. In addition, due to its low-voltage drive characteristic, the requirements for the power supply system are correspondingly reduced, further reducing the overall cost. These factors combined make the variable aperture have strong price competitiveness in the market competition, facilitating its promotion and application in a wider range of application fields.

[0064] In this embodiment, the number of permanent magnets 71 is three, which are evenly distributed along the circumferential direction of the limiting frame 50, and the central angle between adjacent permanent magnets 71 is 120° ± 2°.

[0065] This design makes the magnetic suction force evenly distributed in the circumferential direction, thereby ensuring that the rotating member 30 is evenly stressed during movement and avoiding movement deviation caused by uneven stress. In addition, the evenly distributed permanent magnets 71 can effectively reduce magnetic interference, improving the stability and reliability of the system. By precisely controlling the central angle between adjacent permanent magnets 71, the distribution of the magnetic suction force can be further optimized to ensure a stable pre-pressure under different working conditions.

[0066] In this embodiment, the guiding chute structure 60 includes a first chute 61 arranged on the inner circumferential surface of the limiting frame 50 and in an arc shape, at least one second chute 62 arranged on the outer circumferential surface of the rotating member 30 and in an arc shape, and a plurality of balls 63 rollingly arranged between the first chute 61 and the second chute 62.

[0067] This guiding chute structure 60 design can effectively reduce the friction between the rotating member 30 and the limiting frame 50, improving the smoothness and accuracy of movement. The rolling arrangement of the balls 63 not only reduces the frictional resistance but also extends the service life of the device. In addition, the combination of the arc-shaped first chute 61 and the arc-shaped second chute 62 can ensure that the rotating member 30 always maintains an accurate trajectory during movement, avoiding movement deviation caused by improper chute design.

[0068] In this embodiment, the number of the first sliding grooves 61 and the second sliding grooves 62 is three respectively, which are evenly distributed along the circumferential direction of the rotating member 30, and a plurality of balls 63 are arranged in each first sliding groove 61.

[0069] This design makes the balls 63 evenly distributed in the circumferential direction of the rotating member 30, further reducing the frictional resistance and improving the smoothness and accuracy of the movement. The arrangement of multiple balls 63 can effectively disperse the force, avoiding wear or damage caused by excessive force on a single ball 63. In addition, the evenly distributed first sliding grooves 61 can also ensure the balanced force on the rotating member 30 during the movement, avoiding movement deviation caused by uneven force, thereby improving the stability and reliability of the entire system.

[0070] In this embodiment, the cross-section of the first sliding groove 61 is approximately square, and the cross-section of the second sliding groove 62 is approximately V-shaped.

[0071] This design of the V-shaped or square structure can effectively guide the movement trajectory of the balls 63, ensuring the stability and accuracy of the balls 63 when rolling in the sliding groove. The optimized design of the V-shaped opening angle can reduce the contact stress between the balls 63 and the sliding groove, reduce wear, and extend the service life. In addition, the optimization of the ratio of the diameter of the balls 63 to the curvature radius of the V-shaped groove bottom can further improve the matching accuracy between the balls 63 and the sliding groove, reduce the movement deviation caused by improper matching, thereby improving the movement accuracy and reliability of the entire system.

[0072] In this embodiment, the limiting frame 50 is provided with an anti-rotation positioning post 80, and the rotating member 30 is correspondingly provided with a limiting groove 81 for clearance fit with the anti-rotation positioning post 80.

[0073] This design can effectively prevent the rotating member 30 from rotating accidentally during the movement, ensuring the accurate adjustment of the aperture. The clearance fit design between the anti-rotation positioning post 80 and the limiting groove 81 not only improves the flexibility of assembly but also ensures the stability during the movement. In addition, this design can also effectively reduce the movement deviation caused by assembly errors, improving the accuracy and reliability of the entire system.

[0074] In this embodiment, three piezoelectric actuators 20 are connected in parallel to the printed circuit board 90, and the printed circuit board 90 is installed on the base 10.

[0075] This design can effectively improve the driving efficiency of the piezoelectric actuator 20, ensuring that sufficient driving force can still be generated under low voltage. The piezoelectric actuators 20 connected in parallel can achieve more precise motion control and improve the accuracy of aperture adjustment. In addition, the design of mounting the printed circuit board 90 on the base 10 not only facilitates the integration and management of the circuit, but also improves the stability and reliability of the entire system. This design can also effectively reduce energy consumption and extend the usage time of the device, meeting the requirements of modern electronic devices for energy conservation and environmental protection.

[0076] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable aperture, characterized in that: include: The base is made of magnetic alloy material; At least two piezoelectric actuators are fixedly mounted on the upper surface of the base, and the piezoelectric actuators have a driving boss protruding upward; A rotating movable member, the bottom surface of which forms a friction contact interface with the driving boss, and the rotating movable member is configured to rotate around a vertical axis perpendicular to the base; At least two aperture blades, distributed circumferentially and cooperating with the rotating moving part; A limit frame is coaxially sleeved on the outer periphery of the rotating movable member, and the inner peripheral surface of the limit frame is provided with a guide sliding groove structure matching the outer periphery of the rotating movable member; A magnetic attraction component, comprising at least two permanent magnets symmetrically embedded in the bottom of the limiting frame, wherein the bottom surface of each permanent magnet forms a non-contact gap with the upper surface of the base; The axial magnetic attraction force generated between the permanent magnet and the base is transmitted through the limit frame to form an axial pressing force on the rotating member, so that the friction contact interface maintains a preset contact pressure.

2. The variable aperture according to claim 1, characterized in that: The number of the piezoelectric actuators is three, which are evenly distributed along the circumferential direction of the base, and the central angle between adjacent piezoelectric actuators is 120°±2°.

3. The variable aperture according to claim 1, characterized in that: The number of the permanent magnets is three, which are evenly distributed along the circumferential direction of the limiting frame, and the central angle between adjacent permanent magnets is 120°±2°.

4. The variable aperture according to claim 1, characterized in that: The guide chute structure comprises: A first arc-shaped slide groove is arranged on the inner peripheral surface of the limiting frame, at least one second sliding groove disposed on the outer peripheral surface of the rotating member and in an arc shape, and A plurality of balls are rollingly arranged between the first sliding groove and the second sliding groove.

5. The variable aperture according to claim 4, characterized in that: The number of the first sliding grooves and the second sliding grooves are three respectively, which are evenly distributed along the circumferential direction of the rotating member, and a plurality of the balls are arranged in each first sliding groove.

6. The variable aperture according to claim 4, characterized in that: The cross-sections of the first sliding groove and the second sliding groove are V-shaped or square.

7. The variable aperture according to claim 1, characterized in that: The limiting frame is provided with at least one anti-rotation positioning column, and the rotating movable member is correspondingly provided with a limiting groove which is clearance-matched with the anti-rotation positioning column.

8. The variable aperture according to claim 2, characterized in that: The three piezoelectric actuators are connected in parallel to a printed circuit board, and the printed circuit board is mounted on a base.

9. A camera module, characterized in that: include: Lens assembly; The variable aperture as described in any one of claims 1 to 8, wherein the variable aperture is connected to the lens assembly and is located on the light incident side of the lens assembly.

10. An electronic device, characterized in that include: Equipment housing; The camera module as described in claim 9, wherein the camera module is arranged in the device housing.

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