Variable aperture, camera module and electronic equipment

Abstract

The utility model relates to a variable aperture, a camera module and an electronic device. The variable aperture comprises a base, at least two piezoelectric actuators, a rotating member, 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] This utility model relates to the field of photography, and more specifically, to a variable aperture, a camera module, and an electronic device. Background Technology

[0002] In traditional piezoelectric drive technology, a spring structure is typically used to provide the required preload between the moving part and the piezoelectric block to ensure the normal operation and performance of the piezoelectric drive device. However, when this traditional piezoelectric drive technology is applied to mobile terminal devices such as smartphones, the limitations of the spring structure become apparent because these devices need to undergo a series of rigorous environmental tests in actual use, such as drop tests, micro-drop tests, roller tests, and vibration tests. During these demanding tests, the spring is prone to deformation, leading to changes in the preload. Instability in the preload can seriously affect the performance of the piezoelectric drive and may even cause the entire drive system to fail, thus affecting the normal use and functionality of mobile terminal devices such as smartphones. Therefore, how to provide a more stable and reliable piezoelectric drive technology in mobile phone applications to overcome the problem of preload instability caused by traditional spring structures has become a technical challenge that urgently needs to be solved by those skilled in the art. Utility Model Content

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

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A variable aperture includes a base, at least two piezoelectric actuators, a rotating element, at least two aperture blades, a limiting frame, and a magnetic suction assembly.

[0006] The base is made of a magnetic alloy material.

[0007] At least two piezoelectric actuators are fixedly mounted on the upper surface of the base, each piezoelectric actuator having an upwardly protruding drive boss.

[0008] The rotating actuator has a bottom surface that forms a frictional contact interface with the driving boss, and the rotating actuator is configured to rotate about a vertical axis perpendicular to the base.

[0009] At least two aperture blades are distributed circumferentially and are linked to the rotating moving parts.

[0010] A limiting frame is coaxially sleeved on the outer periphery of the rotating component, and the inner circumferential surface of the limiting frame is provided with a guide groove structure that cooperates with the outer periphery of the rotating component.

[0011] The magnetic attraction assembly includes at least two permanent magnets symmetrically embedded in the bottom of the limiting frame, with the bottom surface of each permanent magnet forming a non-contact gap with the upper surface of the base.

[0012] The axial magnetic attraction force generated between the permanent magnet and the base is transmitted through the limiting frame to form an axial clamping force on the rotating component, so that the friction contact interface maintains a preset contact pressure.

[0013] This variable aperture has advantages such as stable pre-pressure control, miniaturization and lightweight design, no magnetic interference, and low cost.

[0014] Stable Pre-Pressure Control: The pre-pressure control system of the variable aperture employs a non-contact magnetic pre-tensioning mechanism. It replaces traditional mechanical springs (springs) with the non-contact magnetic attraction between a permanent magnet and a magnetically conductive alloy base to achieve axial clamping force on rotating components. During product development, this magnetic pre-tensioning system can flexibly adjust the magnitude of the magnetic attraction force according to actual needs, thereby precisely controlling the preset contact pressure. The pre-pressure is provided by the magnetic attraction force, which can be adjusted by changing the magnetic energy product or size of the magnetic magnet. During environmental testing (environmental testing), due to the non-contact nature of the magnetic attraction force, the system will not deform under external impact like a spring, thus ensuring the stability of the pre-pressure. In actual product use, facing complex environmental impacts, such as drops and vibrations in daily mobile phone use, the system can maintain precise control of the pre-pressure, effectively avoiding piezoelectric drive efficiency reduction or malfunction caused by changes in pre-pressure, significantly improving the reliability and stability of the variable aperture.

[0015] Miniaturization and Lightweight Design: The variable aperture of this invention achieves miniaturization and lightweight design in its structural design. Its design is compact and rational, with all components arranged closely together without redundancy. By employing a non-contact magnetic preload system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the overall size and weight of the device and achieving the design goals of miniaturization and lightweighting. This makes its application in mobile devices (such as mobile phones) with strict space and weight requirements more convenient, providing greater flexibility and freedom for the overall design of the device, while also meeting the aesthetic and usage needs of modern consumers for thin and portable electronic devices.

[0016] No magnetic interference: In its design, the magnetic attraction between the permanent magnet and the magnetically conductive alloy base of this invention is highly directional and concentrated. The magnetic lines of force mainly form closed loops in the non-contact gap between the permanent magnet and the base, preventing magnetic interference to other surrounding electronic components. This characteristic is significant in complex electronic device environments (such as mobile phones), effectively avoiding various 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 equipment.

[0017] Low cost: From a cost perspective, the variable aperture of this invention has a significant low-cost advantage. On the one hand, its structure is relatively simplified, reducing the difficulty of processing and assembling complex mechanical structures, thereby lowering manufacturing costs. On the other hand, the costs of permanent magnets and magnetic alloy materials are relatively stable, and they offer high cost-effectiveness in large-scale production.

[0018] Preferably, the number of piezoelectric actuators is three, which are evenly distributed along the circumference of the base, and the central angle between adjacent piezoelectric actuators is 120°±2°.

[0019] This invention's variable aperture also boasts the advantage of low-voltage drive. Compared to 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 to generate sufficient driving force at a lower voltage. This allows for precise motion control of the rotating components and aperture blades, achieving long stroke and high thrust characteristics. Low-voltage drive not only helps reduce energy consumption and extend equipment lifespan but also meets the energy-saving and environmental protection requirements of modern electronic equipment, offering significant advantages. Furthermore, its low-voltage drive characteristics reduce the requirements for the power supply system, further lowering the overall cost. These factors combined make this variable aperture highly price-competitive in the market, facilitating its wider application and promotion in various fields.

[0020] Preferably, the number of permanent magnets is three, which are evenly distributed along the circumference of the limiting frame, and the central angle between adjacent permanent magnets is 120°±2°.

[0021] This design ensures a uniform distribution of magnetic force along the circumference, guaranteeing balanced force on rotating components and preventing motion deviations caused by uneven force distribution. Furthermore, the uniformly distributed permanent magnets effectively reduce magnetic interference, improving system stability and reliability. By precisely controlling the central angle between adjacent permanent magnets, the distribution of magnetic force can be further optimized, ensuring stable preload under various operating conditions.

[0022] Preferably, the guide groove structure includes a first groove that is arc-shaped and disposed on the inner circumferential surface of the limiting frame, at least one second groove that is arc-shaped and disposed on the outer circumferential surface of the rotating member, and a plurality of balls that are rolled between the first groove and the second groove.

[0023] This guide groove structure design effectively reduces friction between the rotating component and the limiting frame, improving the smoothness and precision of the movement. The rolling arrangement of the balls not only reduces frictional resistance but also extends the service life of the equipment. Furthermore, the combination of the arc-shaped first and second grooves ensures that the rotating component maintains an accurate trajectory throughout its movement, avoiding motion deviations caused by improper groove design.

[0024] Preferably, there are three first and second slide grooves, which are evenly distributed along the circumference of the rotating member, and each first slide groove contains a number of the ball bearings.

[0025] This design ensures that the balls are evenly distributed along the circumference of the rotating component, further reducing frictional resistance and improving the smoothness and precision of the motion. The multiple balls effectively distribute the force, preventing wear or damage caused by excessive force on a single ball. Furthermore, the evenly distributed first and second grooves ensure balanced force on the rotating component during movement, preventing motion deviations caused by uneven force distribution, thereby improving the stability and reliability of the entire system.

[0026] Preferably, the cross-sections of the first and second slides are V-shaped or square.

[0027] This V-shaped or square structure design effectively guides the movement trajectory of the balls, ensuring their stability and accuracy as they roll within the groove. The optimized V-shaped opening angle reduces contact stress between the balls and the groove, decreasing wear and extending service life. Furthermore, the optimized ratio of the ball diameter to the radius of curvature of the V-groove bottom further improves the fit between the balls and the groove, reducing motion deviations caused by improper fit, thereby enhancing the overall system's motion accuracy and reliability.

[0028] Preferably, the limiting frame is provided with at least one anti-rotation positioning post, and the rotating moving part is provided with a limiting groove that is clearance-fitted with the anti-rotation positioning post.

[0029] This design effectively prevents accidental rotation of the rotating component during operation, ensuring accurate adjustment of the aperture. The clearance fit between the anti-rotation positioning post and the limiting groove not only improves assembly flexibility but also ensures stability during movement. Furthermore, this design effectively reduces motion deviations caused by assembly errors, improving the overall system's precision and reliability.

[0030] Preferably, the three piezoelectric actuators are connected in parallel to a printed circuit board, which is mounted on a base.

[0031] This design effectively improves the driving efficiency of piezoelectric actuators, ensuring sufficient driving force even at low voltages. Parallel connection of piezoelectric actuators enables more precise motion control and improves the accuracy of aperture adjustment. Furthermore, the printed circuit board mounted on the base not only facilitates circuit integration and management but also enhances the stability and reliability of the entire system. This design also effectively reduces energy consumption, extends equipment lifespan, and meets the energy-saving and environmentally friendly requirements of modern electronic equipment.

[0032] Another implementation of this utility model is a camera module, including a lens assembly and the aforementioned variable aperture, wherein the variable aperture is connected to the lens assembly and located on the light-incident side of the lens assembly.

[0033] Another implementation of this utility model is an electronic device, including a device housing and a camera module as described above, wherein the camera module is disposed in the housing.

[0034] The advantages of this utility model compared to the prior art are:

[0035] The variable aperture of this invention has the advantages of stable pre-pressure control, miniaturization and lightweight, no magnetic interference, and low cost.

[0036] Stable Pre-Pressure Control: The pre-pressure control system of the variable aperture employs a non-contact magnetic pre-tensioning mechanism. It replaces traditional mechanical springs (springs) with the non-contact magnetic attraction between a permanent magnet and a magnetically conductive alloy base to achieve axial clamping force on rotating components. During product development, this magnetic pre-tensioning system can flexibly adjust the magnitude of the magnetic attraction force according to actual needs, thereby precisely controlling the preset contact pressure. The pre-pressure is provided by the magnetic attraction force, which can be adjusted by changing the magnetic energy product or size of the magnetic magnet. During environmental testing (environmental testing), due to the non-contact nature of the magnetic attraction force, the system will not deform under external impact like a spring, thus ensuring the stability of the pre-pressure. In actual product use, facing complex environmental impacts, such as drops and vibrations in daily mobile phone use, the system can maintain precise control of the pre-pressure, effectively avoiding piezoelectric drive efficiency reduction or malfunction caused by changes in pre-pressure, significantly improving the reliability and stability of the variable aperture.

[0037] Miniaturization and Lightweight Design: The variable aperture of this invention achieves miniaturization and lightweight design in its structural design. Its design is compact and rational, with all components arranged closely together without redundancy. By employing a non-contact magnetic preload system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the overall size and weight of the device and achieving the design goals of miniaturization and lightweighting. This makes its application in mobile devices (such as mobile phones) with strict space and weight requirements more convenient, providing greater flexibility and freedom for the overall design of the device, while also meeting the aesthetic and usage needs of modern consumers for thin and portable electronic devices.

[0038] No magnetic interference: In its design, the magnetic attraction between the permanent magnet and the magnetically conductive alloy base of this invention is highly directional and concentrated. The magnetic lines of force mainly form closed loops in the non-contact gap between the permanent magnet and the base, preventing magnetic interference to other surrounding electronic components. This characteristic is significant in complex electronic device environments (such as mobile phones), effectively avoiding various 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 equipment.

[0039] Low cost: From a cost perspective, the variable aperture of this invention has a significant low-cost advantage. On the one hand, its structure is relatively simplified, reducing the difficulty of processing and assembling complex mechanical structures, thereby lowering manufacturing costs. On the other hand, the costs of permanent magnets and magnetic alloy materials are relatively stable, and they offer high cost-effectiveness in large-scale production. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural diagram of a variable aperture according to an embodiment of the present invention.

[0042] Figure 2 This is a partial exploded view of a variable aperture according to an embodiment of the present invention.

[0043] Figure 3 This is a partial exploded view of a variable aperture from another perspective according to an embodiment of the present invention.

[0044] Figure 4 This is a cross-sectional view of a variable aperture according to an embodiment of the present invention.

[0045] Label Explanation

[0046] 10: Base

[0047] 20: Piezoelectric actuator

[0048] 21: Drive boss (piezoelectric actuator component)

[0049] 30: Rotating component

[0050] 31: Friction contact interface (contact between rotating moving part and driving boss)

[0051] 40: Aperture blades

[0052] 50: Limiting frame

[0053] 60: Guide groove structure (including first groove 61, second groove 62, and ball bearing 63)

[0054] 61: First slide (arc-shaped, located on the limiting frame)

[0055] 62: Second slide (arc-shaped, located on the rotating component)

[0056] 63: Ball bearings (rolling components between grooves)

[0057] 70: Magnetic attraction assembly (including permanent magnet 71 and non-contact gap 72)

[0058] 71: Permanent magnet

[0059] 72: Non-contact gap (distance between permanent magnet and base)

[0060] 80: Anti-rotation positioning post (limiting frame component)

[0061] 81: Limiting groove (mating part of rotating moving part)

[0062] 90: Printed circuit board (piezoelectric actuator connector) Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0065] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0066] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0067] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0068] This embodiment provides a variable aperture, including a base 10, at least two piezoelectric actuators 20, a rotating actuator 30, at least two aperture blades 40, a limiting frame 50, and a magnetic suction assembly 70.

[0069] The base 10 is made of magnetically conductive alloy material.

[0070] At least two piezoelectric actuators 20 are fixedly mounted on the upper surface of the base 10, and each piezoelectric actuator 20 has an upwardly protruding drive boss 21.

[0071] The rotating member 30 has a bottom surface that forms a friction contact interface 31 with the driving boss 21. The rotating member 30 is configured to rotate about a vertical axis perpendicular to the base 10.

[0072] At least two aperture blades 40 are circumferentially distributed and coordinated with the rotating component 30.

[0073] The limiting frame 50 is coaxially sleeved on the outer periphery of the rotating member 30, and the inner circumferential surface of the limiting frame 50 is provided with a guide groove structure 60 that cooperates with the outer periphery of the rotating member 30.

[0074] The magnetic attraction assembly 70 includes at least two permanent magnets 71 symmetrically embedded in the bottom of the limiting frame 50, with the bottom surface of each permanent magnet 71 forming a non-contact gap 72 with the upper surface of the base 10.

[0075] 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 clamping force on the rotating moving part 30, so that the friction contact interface 31 maintains a preset contact pressure.

[0076] This variable aperture has advantages such as stable pre-pressure control, miniaturization and lightweight design, no magnetic interference, and low cost.

[0077] Stable Pre-Pressure Control: The pre-pressure control system of the variable aperture adopts a non-contact magnetic pre-tensioning mechanism. The non-contact magnetic attraction between the permanent magnet 71 and the magnetically conductive alloy base 10 replaces the traditional mechanical spring (spring) to achieve axial clamping force on the rotating component 30. During product development, this magnetic pre-tensioning system can flexibly adjust the magnitude of the magnetic attraction force according to actual needs, thereby precisely controlling the preset contact pressure. The pre-pressure is provided by the magnetic attraction force, which can be adjusted by changing the magnetic energy product or size of the magnetic magnet. During environmental testing (environmental testing), due to the non-contact nature of the magnetic attraction force, the system will not deform under external impact like a spring, thus ensuring the stability of the pre-pressure. In actual product use, facing complex environmental impacts, such as drops and vibrations during daily mobile phone use, the system can always maintain precise control of the pre-pressure, effectively avoiding piezoelectric drive efficiency reduction or malfunction caused by changes in pre-pressure, significantly improving the reliability and stability of the variable aperture.

[0078] Miniaturization and Lightweight Design: The variable aperture of this invention achieves miniaturization and lightweight design in its structural design. Its design is compact and rational, with all components arranged closely together without redundancy. By employing a non-contact magnetic preload system, the use of complex mechanical structures such as traditional mechanical springs is reduced, thereby effectively controlling the overall size and weight of the device and achieving the design goals of miniaturization and lightweighting. This makes its application in mobile devices (such as mobile phones) with strict space and weight requirements more convenient, providing greater flexibility and freedom for the overall design of the device, while also meeting the aesthetic and usage needs of modern consumers for thin and portable electronic devices.

[0079] No magnetic interference: In its design, the magnetic attraction between the permanent magnet 71 and the magnetically conductive alloy base 10 of this invention has a high degree of 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, which will not cause magnetic interference to other surrounding electronic components. This characteristic is of great significance in complex electronic equipment environments (such as mobile phones), effectively avoiding various signal interference and data transmission errors caused by magnetic interference, ensuring the stable operation of the entire equipment system, and improving the reliability and performance of the equipment.

[0080] Low cost: From a cost perspective, the variable aperture of this invention has a significant low-cost advantage. On the one hand, its structure is relatively simplified, reducing the difficulty of processing and assembling complex mechanical structures, thereby lowering manufacturing costs. On the other hand, the costs of the permanent magnet 71 and the magnetic alloy material are relatively stable, and they offer high cost-effectiveness in large-scale production.

[0081] In this embodiment, there are three piezoelectric actuators 20, which are evenly distributed along the circumference of the base 10, and the central angle between adjacent piezoelectric actuators 20 is 120°±2°.

[0082] The variable aperture of this invention also boasts the advantage of low-voltage drive. Compared to 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 component 30 and the aperture blades 40 to achieve precise motion control. Low-voltage drive not only helps reduce energy consumption and extend equipment lifespan but also meets the energy-saving and environmental protection requirements of modern electronic equipment, offering significant advantages. Furthermore, due to its low-voltage drive characteristics, the requirements for the power supply system are correspondingly reduced, further lowering the overall cost. These factors combined make this variable aperture highly price-competitive in the market, facilitating its promotion and application in a wider range of fields.

[0083] In this embodiment, there are three permanent magnets 71, which are evenly distributed along the circumference of the limiting frame 50, and the central angle between adjacent permanent magnets 71 is 120°±2°.

[0084] This design ensures that the magnetic attraction force is evenly distributed in the circumferential direction, thereby ensuring that the rotating component 30 is subjected to balanced forces during movement and avoiding motion deviations caused by uneven forces. Furthermore, the evenly distributed permanent magnets 71 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 attraction force can be further optimized, ensuring a stable preload under different operating conditions.

[0085] In this embodiment, the guide groove structure 60 includes a first groove 61 that is arc-shaped and disposed on the inner peripheral surface of the limiting frame 50, at least one second groove 62 that is arc-shaped and disposed on the outer peripheral surface of the rotating member 30, and a plurality of balls 63 that are rolled between the first groove 61 and the second groove 62.

[0086] This guide groove structure 60 design effectively reduces friction between the rotating component 30 and the limiting frame 50, improving the smoothness and precision of the movement. The rolling arrangement of the balls 63 not only reduces frictional resistance but also extends the service life of the equipment. Furthermore, the combination of the arc-shaped first groove 61 and the arc-shaped second groove 62 ensures that the rotating component 30 maintains an accurate trajectory during movement, avoiding motion deviations caused by improper groove design.

[0087] In this embodiment, there are three first slide grooves 61 and three second slide grooves 62, which are evenly distributed along the circumferential direction of the rotating member 30, and a plurality of balls 63 are provided in each first slide groove 61.

[0088] This design ensures that the balls 63 are evenly distributed along the circumference of the rotating component 30, further reducing frictional resistance and improving the smoothness and precision of the motion. The arrangement of multiple balls 63 effectively distributes the force, preventing wear or damage caused by excessive force on a single ball 63. Furthermore, the evenly distributed first groove 61 ensures that the rotating component 30 experiences balanced force during movement, preventing motion deviations caused by uneven force distribution, thereby improving the stability and reliability of the entire system.

[0089] In this embodiment, the cross-section of the first groove 61 is approximately square, and the cross-section of the second groove 62 is approximately V-shaped.

[0090] This V-shaped or square structure design effectively guides the movement trajectory of the ball 63, ensuring its stability and accuracy as it rolls within the groove. The optimized V-shaped opening angle reduces contact stress between the ball 63 and the groove, minimizing wear and extending service life. Furthermore, the optimized ratio of the ball 63's diameter to the radius of curvature of the V-groove bottom further improves the fit between the ball 63 and the groove, reducing movement deviations caused by improper fit, thereby enhancing the overall system's motion accuracy and reliability.

[0091] In this embodiment, the limiting frame 50 is provided with an anti-rotation positioning post 80, and the rotating moving part 30 is provided with a limiting groove 81 that is clearance-fitted with the anti-rotation positioning post 80.

[0092] This design effectively prevents the rotating component 30 from rotating unexpectedly during operation, ensuring accurate adjustment of the aperture. The clearance fit between the anti-rotation positioning post 80 and the limiting groove 81 not only improves assembly flexibility but also ensures stability during movement. Furthermore, this design effectively reduces motion deviations caused by assembly errors, improving the overall system's precision and reliability.

[0093] In this embodiment, three piezoelectric actuators 20 are connected in parallel to a printed circuit board 90, which is mounted on a base 10.

[0094] This design effectively improves the driving efficiency of the piezoelectric actuator 20, ensuring sufficient driving force even at low voltages. The parallel connection of the piezoelectric actuators 20 enables more precise motion control and improves the accuracy of aperture adjustment. Furthermore, the design of mounting the printed circuit board 90 on the base 10 not only facilitates circuit integration and management but also enhances the stability and reliability of the entire system. This design also effectively reduces energy consumption, extends equipment lifespan, and meets the energy-saving and environmental protection requirements of modern electronic equipment.

[0095] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable aperture, characterized in that, include: The base is made of a magnetically conductive alloy material; At least two piezoelectric actuators are fixedly mounted on the upper surface of the base, and each piezoelectric actuator has an upwardly protruding drive boss. A rotating member, the bottom surface of which forms a frictional contact interface with the driving boss, is configured to rotate about a vertical axis perpendicular to the base. At least two aperture blades, circumferentially distributed and linked with the rotating moving part; A limiting frame is coaxially sleeved on the outer periphery of the rotating moving part, and the inner circumferential surface of the limiting frame is provided with a guide groove structure that cooperates with the outer periphery of the rotating moving part. The magnetic attraction assembly includes at least two permanent magnets symmetrically embedded in the bottom of the limiting frame, with the bottom surface of each permanent magnet forming 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 limiting frame to form an axial clamping force on the rotating component, 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 piezoelectric actuators is three, which are evenly distributed along the circumference 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 permanent magnets is three, which are evenly distributed along the circumference 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 groove structure includes: The first sliding groove, which is arc-shaped, is set on the inner circumferential surface of the limiting frame. At least one second groove, which is arc-shaped and disposed on the outer peripheral surface of the rotating member, and Multiple balls are rolled between the first slide groove and the second slide groove.

5. The variable aperture according to claim 4, characterized in that, There are three first slide grooves and three second slide grooves, which are evenly distributed along the circumference of the rotating component, and several balls are arranged in each first slide groove.

6. The variable aperture according to claim 4, characterized in that, The cross-sections of the first and second slides are either 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 post, and the rotating moving part is provided with a limiting groove that is clearance-fitted with the anti-rotation positioning post.

8. The variable aperture according to claim 2, characterized in that, The three piezoelectric actuators are connected in parallel to a printed circuit board, which 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 1-8, 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 is disposed in the device housing.

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