CN115755491B - Iris diaphragm, harmonic oscillator, lens assembly and electronic equipment - Google Patents

Abstract

The application provides an iris diaphragm, a harmonic oscillator, a lens assembly and electronic equipment. The iris diaphragm includes a stator, a mover, a plurality of blades, a resonator, and a support. The rotor is rotationally connected with the stator. A portion of the vane is connected to the stator. A part of the blade is connected with the mover. The plurality of blades jointly enclose an aperture. The harmonic oscillator and the supporting piece are arranged on one side of the rotor at intervals and jointly support the rotor. The harmonic oscillator is used for driving the rotor to rotate relative to the stator. The mover drives the plurality of blades to rotate so as to change the aperture of the diaphragm hole. The variable aperture of the application can effectively reduce the size of the variable aperture in the width direction and the length direction by stacking the harmonic oscillator and the mover. In addition, the harmonic oscillator and the supporting piece are matched to jointly support the rotor, so that the annular harmonic oscillator can be avoided, and the inner space of the iris diaphragm can be saved. The iris diaphragm can improve the internal space utilization rate while realizing the miniaturization arrangement.

Description

Variable aperture, resonator, lens assembly and electronic equipment

Technical Field

The present application relates to the field of camera technology, and in particular to a variable aperture, a resonator, a lens assembly and an electronic device.

Background Art

In recent years, major manufacturers have put forward more stringent requirements on the imaging quality of lens assemblies while pursuing the miniaturization of lens assemblies. Traditional lens assemblies are provided with variable apertures. By changing the size of the aperture hole of the variable aperture, the light intensity of the incident light can be adjusted, thereby greatly improving the imaging quality of the lens assembly. However, the traditional variable aperture is to adjust the size of the aperture hole by driving the blades to move through a voice coil motor. Since the voice coil motor is susceptible to electromagnetic interference, the size of the aperture hole is not easy to adjust accurately. At the same time, the voice coil motor also needs to be equipped with additional coils and magnets, which makes the size of the variable aperture larger and the internal space utilization rate is low.

Summary of the invention

The embodiments of the present application provide a resonator whose aperture hole can be accurately adjusted while taking into account miniaturization and high space utilization, a variable aperture including the resonator, a lens module including the variable aperture, and an electronic device including the lens module.

In a first aspect, a variable aperture is provided. The variable aperture includes a stator, a mover, a plurality of blades, a resonator, and a support. The mover is rotatably connected to the stator. A portion of the blade is connected to the stator. A portion of the blade is connected to the mover. A plurality of blades together surround an aperture hole. The resonator and the support are spaced apart and located on one side of the mover, and together support the mover. The resonator is used to drive the mover to rotate relative to the stator. The mover drives the plurality of blades to rotate, so that the aperture of the aperture hole changes.

It is understandable that the conventional variable aperture generally controls the aperture size through magnets and coils. This makes the conventional variable aperture prone to small changes due to the upper limit of the magnetic force of the magnet and the coil, that is, the aperture size of the conventional variable aperture is limited. At the same time, the magnetoelectrically driven variable aperture is susceptible to magnetic interference, resulting in the aperture size of the variable aperture being difficult to accurately adjust. The variable aperture of the present application drives the mover to rotate relative to the stator through a resonator, and the aperture size will not be affected by the magnetic force of the magnet and the coil, so that the aperture size can be accurately adjusted. At the same time, the variable aperture of the present application does not require the additional arrangement of coils and magnets, which is conducive to the miniaturization of the variable aperture.

In addition, the variable aperture of the present application supports the mover through the resonator and the support member, thereby avoiding the use of a larger resonator (such as a ring-shaped resonator, etc.) to support the mover, which is beneficial to saving the internal space of the variable aperture.

In addition, the variable aperture of the present application also effectively reduces the size of the variable aperture in the width direction and the length direction by placing the resonator at the bottom of the mover, that is, the resonator and the mover are stacked, which is conducive to realizing the miniaturization of the variable aperture.

In one possible implementation, the stator includes a housing. The mover includes a rotating bracket. The rotating bracket is located on the inner side of the housing. The rotating bracket is rotatably connected to the housing. A portion of the blade is connected to the housing. A portion of the blade is connected to the rotating bracket. The resonator and the support are located on one side of the rotating bracket at intervals and jointly support the rotating bracket. The resonator is used to drive the rotating bracket to rotate relative to the housing. The rotating bracket drives the multiple blades to rotate so that the aperture of the aperture hole changes. In this way, by rotating the rotating bracket relative to the housing to drive the multiple blades to rotate, the size of the aperture hole can be accurately adjusted. At the same time, the rotating bracket is located on the inner side of the housing, which can effectively prevent the rotating bracket from interfering with external devices.

In a possible implementation, the rotating bracket includes a first part and a second part. The second part is connected to the first part. The first part is bent relative to the second part. A part of the blade is connected to the second part of the rotating bracket. In the thickness direction of the variable aperture, the first part is arranged relative to at least a part of the shell, and the first part is rotatably connected to the shell. The resonator and the support are spaced apart and located on a side of the first part away from the shell, and jointly support the first part. In this way, by arranging the first part of the rotating bracket relative to at least a part of the shell in the thickness direction of the variable aperture, the coaxiality of the shell and the rotating bracket can be ensured, thereby avoiding the lateral posture difference of the variable aperture when adjusting the size of the aperture hole, which is conducive to achieving accurate adjustment of the aperture hole size. At the same time, the resonator and the rotating bracket are stacked along the thickness direction of the variable aperture, which is conducive to reducing the radial size of the variable aperture, thereby realizing a miniaturized setting of the variable aperture.

In a possible implementation, the housing includes a third part and a fourth part. The fourth part is connected to the third part, and the fourth part is bent relative to the third part. In the thickness direction of the variable aperture, the third part is arranged opposite to the first part, and the third part is rotatably connected to the first part. The first part and the third part are located between the fourth part and the second part, and the resonator and the support are spaced apart and located on the side of the first part away from the third part. The stator also includes a base, the fourth part of the housing is fixed on the base, and the resonator and the support are both arranged on the base. In this way, the first part and the third part are arranged relative to each other in the thickness direction of the variable aperture, which is conducive to improving the coaxiality of the housing and the rotating bracket, thereby avoiding the lateral posture difference of the variable aperture when adjusting the size of the aperture hole, which is conducive to achieving accurate adjustment of the aperture hole size.

In a possible implementation, the housing is provided with a first groove, the first part is provided with a second groove, and the first groove and the second groove are arranged opposite to each other. The variable aperture further includes a ball, a part of the ball is located in the first groove, and the other part of the ball is located in the second groove. In this way, the opening of the first groove and the opening of the second groove can be arranged opposite to each other, and are stacked along the thickness direction of the variable aperture, so that the housing and the first groove can be integrally formed, and the rotating bracket and the second groove can be integrally formed, which is conducive to ensuring the coaxiality of the first through hole and the second through hole, thereby avoiding the lateral posture difference of the variable aperture when adjusting the size of the aperture hole, which is conducive to achieving accurate adjustment of the aperture hole size.

In a possible implementation, the variable aperture further includes a ball holder, which is fixed to a surface of the housing facing the first portion, or the ball holder is fixed to a surface of the first portion facing the housing. The ball holder is provided with a through hole, and a part of the ball is arranged in the through hole. In this way, the ball can support the housing more stably, and avoid tilting between the housing and the rotating bracket.

In a possible implementation, the resonator includes a first piezoelectric ceramic, which is pressed on the mover under an external force. The first piezoelectric ceramic is used to generate an elliptical motion under an electrical signal, thereby driving the mover to rotate relative to the stator.

It is understandable that, compared with the variable aperture driven by magnetoelectric drive, the variable aperture of the present application is piezoelectric driven, and the resonator has a larger driving stroke. The variable aperture can realize the rapid switching of the aperture hole size in a large range through piezoelectric drive, which is conducive to improving the response speed of the variable aperture. In addition, the variable aperture in the present application can realize power-off self-locking and maintain the size of the aperture hole unchanged. There is no need to set an additional locking structure inside the variable aperture, which is conducive to realizing the miniaturization setting of the variable aperture. At the same time, the variable aperture does not need to be powered on all the time, and there is no additional power consumption after power failure, which is conducive to improving the battery life of the camera module.

In a possible implementation, the first piezoelectric ceramic is in a strip shape. Thus, compared with the ring-shaped first piezoelectric ceramic, the first piezoelectric ceramic in the strip shape occupies a smaller space, which is conducive to realizing a miniaturized setting of the variable aperture.

In a possible implementation, the end of the first piezoelectric ceramic is pressed on the mover. In this way, the displacement of the end of the first piezoelectric ceramic during elliptical motion is more obvious, thereby realizing rapid switching of the aperture size within a wide range, which is beneficial to improving the response speed of the variable aperture.

In a possible implementation, the resonator further includes a first elastic body, the first elastic body is fixed on the first piezoelectric ceramic, and the first piezoelectric ceramic is squeezed on the mover through the first elastic body under external force. In this way, the first piezoelectric ceramic indirectly squeezes the mover through the first elastic body, which is conducive to improving the service life of the first piezoelectric ceramic, thereby improving the service life of the entire variable aperture.

In a possible implementation, the variable aperture further includes a bracket, the bracket is located at one side of the mover, and the first piezoelectric ceramic and the support are arranged on the bracket with a gap. The bracket presses the first piezoelectric ceramic and the support onto the mover under an external force. In this way, by arranging the first piezoelectric ceramic and the support on the bracket, installation is facilitated.

In a possible implementation, the bracket is provided with a second fixing groove, the supporting member is a supporting ball, and at least a portion of the supporting ball is located in the second fixing groove. In this way, the movement direction of the supporting ball can be limited by providing the second fixing groove.

In a possible implementation, the support member includes a second piezoelectric ceramic, the second piezoelectric ceramic is fixed on the bracket, and the second piezoelectric ceramic is pressed on the mover under an external force. The second piezoelectric ceramic is used to generate an elliptical motion under an electrical signal, thereby driving the mover to rotate relative to the stator.

It is understandable that when the support member includes a second piezoelectric ceramic, the variable aperture can generate elliptical motion in the same direction in the first piezoelectric ceramic and the second piezoelectric ceramic by inputting PWM signals to the resonator and the support member at the same time. In this way, a driving force couple is formed between the resonator and the support member, so that the mover can be driven to rotate relative to the stator more quickly, and the size of the aperture hole can be quickly switched within a large range, effectively improving the response speed of the variable aperture.

In addition, compared to a variable aperture with only one resonator, the variable aperture of the present application effectively increases the driving force of the mover by simultaneously providing a resonator and a support member, wherein the support member includes a second piezoelectric ceramic, so that the mover can carry a larger and heavier rotating bracket, thereby increasing the adjustment range of the variable aperture.

In a possible implementation, the variable aperture further includes a spring, and at least a portion of the spring is located on a side of the bracket away from the first piezoelectric ceramic. A portion of the spring is fixed to a side of the bracket facing away from the mover, and another portion of the spring is fixed to the stator. The bracket drives the driving member to squeeze the mover under the action of the spring. The bracket squeezes the first piezoelectric ceramic and the support member onto the mover under the external force of the spring. In this way, the spring enables the first piezoelectric ceramic to squeeze the mover, thereby increasing the friction between the mover and the first piezoelectric ceramic, avoiding slippage between the first piezoelectric ceramic and the mover, and facilitating accurate adjustment of the aperture size.

In a possible implementation, the first piezoelectric ceramic includes a first end and a second end, the first end is used to input a first signal, and the second end is used to input a second signal. When the first signal and the second signal are both positive or negative, the first piezoelectric ceramic stretches and vibrates along a first direction, wherein the first direction is the length direction of the first piezoelectric ceramic. When one of the first signal and the second signal is positive and the other is negative, the first piezoelectric ceramic bends and vibrates along a second direction, wherein the second direction is the thickness direction of the first piezoelectric ceramic. The stretching vibration and the bending vibration form an elliptical motion.

It can be understood that the variable aperture of the present application applies a first signal and a second signal to the two ends of the first piezoelectric ceramic of the resonator respectively, so as to simultaneously excite the stretching vibration of the first piezoelectric ceramic along the first direction and the bending vibration along the second direction, thereby generating elliptical motion in the coupling of the first piezoelectric ceramic. In this way, by controlling the first piezoelectric ceramic to generate elliptical motion, the mover can be driven to rotate relative to the stator, thereby adjusting the size of the aperture. Compared with the variable aperture driven by magnetoelectric drive, the variable aperture of the present application is piezoelectrically driven, and the range of change of the aperture is not affected by the magnetic force of the magnet and the coil, and the size of the aperture can be accurately adjusted.

In a possible implementation, the stator further includes a base. The housing is fixed on the base. The resonator and the support are arranged on the base. In this way, the resonator and the support can be located inside the housing and the base, thereby preventing the resonator and the support from being affected by impurities such as dust, which is beneficial to improving the service life of the variable aperture.

In a possible implementation, a first mounting groove is provided on a side of the first part facing away from the convex portion, and the variable aperture further includes a first friction plate, which is fixed to the first mounting groove, and the resonator abuts against the first friction plate. In this way, by providing the first friction plate between the resonator and the mover, the friction between the resonator and the mover can be effectively increased, and slipping between the resonator and the mover can be avoided, which is conducive to accurate adjustment of the size of the aperture hole.

In a possible implementation, the variable aperture further includes a magnet and a position sensor, a second mounting groove is further provided on a side of the first portion facing away from the convex portion, the magnet is fixed to the second mounting groove, and the position sensor is fixed to the circuit board. The position sensor is used to detect the magnetic field strength when the magnet is in different positions.

In a possible implementation, at least one end of the first elastic body protrudes toward the mover. In this way, the displacement of the end of the first elastic body during elliptical motion is more obvious, thereby realizing rapid switching of the aperture size within a wide range, which is beneficial to improving the response speed of the variable aperture.

In the second aspect, a resonator is provided. The resonator includes a first piezoelectric ceramic, the first piezoelectric ceramic includes a first end and a second end, the first end is used to input a first signal, and the second end is used to input a second signal. When the first signal and the second signal are both positive or negative, the first piezoelectric ceramic stretches and vibrates along a first direction, wherein the first direction is the length direction of the first piezoelectric ceramic. When one of the first signal and the second signal is positive and the other is negative, the first piezoelectric ceramic bends and vibrates along a second direction, wherein the second direction is the thickness direction of the first piezoelectric ceramic. The stretching vibration and the bending vibration form an elliptical motion.

It can be understood that by applying the first signal and the second signal to both ends of the first piezoelectric ceramic of the resonator respectively, the stretching vibration of the first piezoelectric ceramic along the first direction and the bending vibration along the second direction can be simultaneously excited, thereby generating elliptical motion in the first piezoelectric ceramic coupling.

In a possible implementation, the ratio of the length of the longest side of the cross section of the resonator to the length of the driving member is in the range of one tenth to one third. In this way, the frequency of the resonator's telescopic vibration and the frequency of its bending vibration can be closer, so that the first driving foot and the second driving foot can better synthesize an elliptical motion.

In a possible implementation, the period of the first signal and the second signal is T. From 0 to T/4, the first signal is positive and the second signal is positive. From T/4 to T/2, the first signal is positive and the second signal is negative. From T/2 to 3T/4, the first signal is negative and the second signal is positive. From 3T/4 to T, the first signal is negative and the second signal is negative. In this way, through the changes in the first signal and the second signal, the first piezoelectric ceramic can generate stretching vibration and bending vibration, which are then coupled to form elliptical motion.

In a possible implementation, the first end of the first piezoelectric ceramic includes a first input end and a second input end, the first input end and the second input end are arranged in a third direction, and the width direction of the first piezoelectric ceramic is the third direction. The first input end is used to input a first signal, and the second input end is used to input a second signal, and the first signal and the second signal are synthesized into a first signal. In this way, the first signal can be synthesized by inputting the first signal and the second signal to the first end.

In a possible implementation, the period of the first signal and the second signal is T. From 0 to T/4, the first signal is a first value, and the second signal is 0. From T/4 to T/2, the first signal is 0, and the second signal is a second value. From T/2 to 3T/4, the first signal is 0, and the second signal is a second value. From 3T/4 to T, the first signal is a first value, and the second signal is 0. In this way, the first signal is synthesized through the periodic changes of the first signal and the second signal.

In a possible implementation, the first piezoelectric ceramic is in a strip shape. Thus, compared with the ring-shaped first piezoelectric ceramic, the first piezoelectric ceramic in the strip shape occupies a smaller space, which is conducive to realizing a miniaturized setting of the variable aperture.

In a possible implementation, the resonator further includes a first elastic body, and the first elastic body is fixed on the first piezoelectric ceramic. In this way, the first piezoelectric ceramic indirectly presses the mover through the first elastic body, which is conducive to improving the service life of the first piezoelectric ceramic.

In a third aspect, a variable aperture is provided. The variable aperture includes a stator, a mover, a plurality of blades, and the resonator as described above, the mover is rotatably connected to the stator, a portion of the blades is connected to the stator, a portion of the blades is connected to the mover, and a plurality of blades together surround an aperture. The resonator is used to drive the mover to rotate relative to the stator, and the mover drives the plurality of blades to rotate, so that the aperture of the aperture changes.

It is understandable that, compared with the variable aperture driven by magnetoelectric drive, the variable aperture of the present application is piezoelectric driven, and the resonator has a larger driving stroke. The variable aperture can realize the rapid switching of the aperture hole size in a large range through piezoelectric drive, which is conducive to improving the response speed of the variable aperture. In addition, the variable aperture in the present application can realize power-off self-locking and maintain the size of the aperture hole unchanged. There is no need to set an additional locking structure inside the variable aperture, which is conducive to realizing the miniaturization setting of the variable aperture. At the same time, the variable aperture does not need to be powered on all the time, and there is no additional power consumption after power failure, which is conducive to improving the battery life of the camera module.

In a fourth aspect, a lens assembly is provided, which includes a camera module and the above-mentioned variable aperture, wherein the variable aperture is located at the light incident side of the camera module, and the variable aperture is used to adjust the luminous flux of ambient light entering the camera module.

It is understandable that the variable aperture in the lens assembly of the present application drives the mover to rotate relative to the stator through the resonator, and the range of change of the aperture hole will not be affected by the magnetic force of the magnet and the coil, so that the size of the aperture hole can be accurately adjusted. At the same time, the variable aperture of the present application does not need to be additionally provided with coils and magnets, which is conducive to the miniaturization of the variable aperture, and then the miniaturization of the lens assembly.

In a fifth aspect, an electronic device is provided. The electronic device includes a device housing and the above-mentioned lens assembly, and the lens assembly is arranged inside the device housing. It can be understood that the lens assembly in the electronic device of the present application is piezoelectrically driven, and the variable aperture drives the mover to rotate relative to the stator through the resonator, and the range of change of the aperture hole will not be affected by the magnetic force of the magnet and the coil, so that the size of the aperture hole can be accurately adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

FIG1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

FIG2 is a partial cross-sectional view of an embodiment of the electronic device shown in FIG1 taken along line A-A;

FIG3 is a schematic structural diagram of an implementation of the lens assembly shown in FIG2 ;

FIG4 is an exploded schematic diagram of the lens assembly shown in FIG3 ;

FIG5 is an exploded schematic diagram of the variable aperture of the lens assembly shown in FIG3 ;

FIG6 is a schematic structural diagram of the housing and the base shown in FIG5 ;

FIG7 is a cross-sectional view of a partial structure of the variable aperture shown in FIG4 on line B-B of an embodiment;

FIG8 is a schematic structural diagram of the rotating bracket shown in FIG5;

FIG9 is a schematic structural diagram of the rotating bracket shown in FIG5 from another perspective;

FIG10 is a cross-sectional view of a partial structure of the variable aperture shown in FIG4 on line B-B of an embodiment;

FIG11 is a partial structural schematic diagram of the variable aperture shown in FIG5 ;

FIG12 is a cross-sectional view of a partial structure of the variable aperture described in FIG4 on line B-B in an embodiment;

FIG13 is a partial structural schematic diagram of the variable aperture shown in FIG5 ;

FIG14 is a schematic diagram of a partial structure of the variable aperture shown in FIG5 ;

FIG15 is a schematic structural diagram of a portion of the variable aperture shown in FIG13 being converted from the second state to the first state;

FIG16 is a schematic diagram of the exploded structure of the driving mechanism shown in FIG5 ;

FIG17 is a schematic structural diagram of the bracket shown in FIG16;

FIG18 is a schematic structural diagram of the bracket shown in FIG17 at another angle;

FIG19 is a schematic diagram of the structure of the resonator of the driving mechanism shown in FIG16;

FIG20 is a schematic diagram of a partial structure of the driving mechanism shown in FIG16;

FIG21 is a schematic diagram of a partial structure of the driving mechanism shown in FIG16;

FIG22 is a schematic structural diagram of the driving mechanism shown in FIG16;

FIG23 is a schematic structural diagram of the driving mechanism shown in FIG22 at another angle;

FIG24 is a schematic structural diagram of a base and a driving mechanism of the variable aperture shown in FIG5 ;

FIG25 is a cross-sectional view of an embodiment of the variable aperture diaphragm shown in FIG4 on line B-B;

Fig. 26 is a cross-sectional view of an embodiment of the variable aperture shown in Fig. 4 on line C-C;

FIG27 is a cross-sectional view of an embodiment of the variable aperture diaphragm shown in FIG4 on line D-D;

FIG28 is a schematic diagram of the structure of the resonator shown in FIG16 from another perspective;

FIG29 is a schematic diagram of the structure of the resonator shown in FIG28 from another perspective;

FIG30 is a schematic diagram of a signal input to the first input terminal shown in FIG29;

FIG31 is a schematic diagram of a signal input to the second input terminal shown in FIG29;

FIG32 is a schematic diagram of a composite signal of the first input terminal and the second input terminal shown in FIG29;

FIG33 is a schematic diagram of a signal input to the third input terminal shown in FIG29;

FIG34 is a schematic diagram of a signal input to the fourth input terminal shown in FIG29;

FIG35 is a schematic diagram of a composite signal of the third input terminal and the fourth input terminal shown in FIG29;

FIG36 is a schematic diagram of the resonator shown in FIG28 generating stretching vibration;

FIG37 is a schematic diagram of the resonator shown in FIG28 generating bending vibration;

FIG38 is an enlarged schematic diagram of the variable aperture shown in FIG26 at positions E1 and E2;

FIG39 is an enlarged schematic diagram of the variable aperture shown in FIG26 at positions E1 and E2;

FIG40 is a cross-sectional view of the variable aperture shown in FIG4 on line B-B in another embodiment;

FIG41 is an exploded schematic diagram of a drive mechanism of the variable aperture shown in FIG40 ;

FIG. 42 is a schematic diagram of the partial structure of the driving mechanism shown in FIG. 41 .

DETAILED DESCRIPTION

The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

In the description of the embodiments of the present application, it is understood that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. "Sliding connection" means that the two are connected to each other and can slide relative to each other after the connection. "Multiple" means at least two.

Fig. 1 is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. Fig. 2 is a partial cross-sectional view of an implementation of the electronic device 1000 shown in Fig. 1 on line A-A.

As shown in FIG1 , the electronic device 1000 may be a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, an augmented reality (AR) glasses, an AR helmet, a virtual reality (VR) glasses or a VR helmet, etc., which have a camera function. The electronic device 1000 of the embodiment shown in FIG1 is described by taking a mobile phone as an example.

As shown in FIG. 1 and FIG. 2 , the electronic device 1000 may include a lens assembly 100, a device housing 200, and a screen 300. It is understood that FIG. 1 and the related drawings below only schematically illustrate some components included in the electronic device 1000, and the actual shape, actual size, actual position, and actual structure of these components are not limited by FIG. 1 and the drawings below. In addition, when the electronic device 1000 is a device of some other form, the electronic device 1000 may not include the screen 300.

For ease of description, the width direction of the electronic device 1000 is defined as the X axis. The length direction of the electronic device 1000 is defined as the Y axis. The thickness direction of the electronic device 1000 is defined as the Z axis. It is understood that the coordinate system setting of the electronic device 1000 can be flexibly set according to specific actual needs.

Exemplarily, the device housing 200 may include a frame 201 and a back cover 202. The back cover 202 is fixed to one side of the frame 201. Exemplarily, the back cover 202 may be fixedly connected to the frame 201 by adhesive. The back cover 202 may also be an integrally formed structure with the frame 201, that is, the back cover 202 and the frame 201 are an integral structure.

In addition, the screen 300 is located on the side of the frame 201 away from the back cover 202. At this time, the screen 300 and the back cover 202 are respectively located on both sides of the frame 201. The screen 300, the frame 201 and the back cover 202 together surround the interior of the electronic device 1000. The interior of the electronic device 1000 can be used to place components of the electronic device 1000, such as a battery, a receiver or a microphone. Among them, the screen 300 can be a flat screen or a curved screen.

Exemplarily, the lens assembly 100 may be located inside the electronic device 1000. The lens assembly 100 may be fixed to the side of the screen 300 facing the back cover 202. The back cover 202 may be provided with a light-transmitting hole 203. The shape of the light-transmitting hole 203 is not limited to the circular shape illustrated in FIG. 1. The light-transmitting hole 203 connects the inside of the electronic device 1000 to the outside of the electronic device 1000. Light outside the electronic device 1000 may enter the inside of the electronic device 1000 through the first light-transmitting hole. The lens assembly 100 may collect ambient light entering the inside of the electronic device 1000.

Fig. 3 is a schematic diagram of the structure of an embodiment of the lens assembly 100 shown in Fig. 2. Fig. 4 is an exploded schematic diagram of the lens assembly 100 shown in Fig. 3.

As shown in Figures 3 and 4, the lens assembly 100 may include a variable aperture 1 and a camera module 2. The variable aperture 1 may be located on the light incident side of the camera module 2 (see Figure 2). The variable aperture 1 may have an aperture hole 1a. The size of the aperture hole 1a may be automatically adjusted. Ambient light may enter the camera module 2 through the aperture hole 1a of the variable aperture 1. It is understandable that the connection relationship between the variable aperture 1 and the camera module 2 is not specifically limited in this application. In addition, the specific structure of the variable aperture 1 will be described in detail in the following structural related drawings, which will not be repeated here.

Exemplarily, the camera module 2 may include a lens (not shown) and a motor (not shown). The motor may be a voice coil motor or a shape memory alloy (SMA) motor. It should be understood that the present application does not limit the specific structure of the motor. The lens may be disposed on the motor. The motor is used to drive the lens to move along the optical axis direction (i.e., the Z-axis direction) of the lens assembly 100. The variable aperture 1 may be fixed to the lens and located on the light incident side of the lens. At this time, ambient light may enter the lens through the aperture hole 1a of the variable aperture 1.

It is understandable that the camera module 2 can be a module that directly collects light along the Z-axis direction, or it can be a periscope camera module. The periscope camera module can convert the light along the Z-axis direction into light propagating along the X-Y plane and collect the light.

The above specifically introduces the structures of the electronic device and the lens assembly 100 , and the following specifically introduces the structures of several variable apertures 1 in conjunction with the relevant drawings.

FIG. 5 is an exploded schematic diagram of the variable aperture 1 of the lens assembly 100 shown in FIG. 3 .

First embodiment: As shown in FIG5 , the variable aperture 1 may include a housing 10, a base 20, a rotating bracket 30, a driving mechanism 40, a plurality of balls 50, a plurality of blades 60, a cover plate 70, a gasket 80, and a ball holder 90. Among them, the housing 10 and the base 20 may together constitute the housing of the variable aperture 1, and also the stator 1b of the variable aperture 1. The rotating bracket 30 may constitute the mover 1c of the variable aperture 1. It is understood that in this embodiment, the number of balls 50 is three. Among them, the shape and size of each ball 50 are the same. Therefore, each ball 50 may use the same number. For the sake of simplicity of the drawings, FIG5 is only numbered on one of the balls 50. In other embodiments, the number of balls 50 is not limited. Among them, the shape and size of each ball 50 may also be different. The specific shape and size can be flexibly set according to needs. In this embodiment, the numbering method of the plurality of blades 60 is the same as the numbering method of the plurality of balls 50. No further description is given here. It should be understood that when there are multiple components in the following text, the components can also refer to the numbering method of the multiple balls 50. The specific details will not be repeated below.

It should be understood that in this embodiment, the width direction of the variable aperture 1, that is, the width direction of the electronic device 1000, is the X-axis direction. The length direction of the variable aperture 1, that is, the length direction of the electronic device 1000, is the Y-axis direction. The thickness direction of the variable aperture 1, that is, the thickness direction of the electronic device 1000, is the Z-axis direction. In other embodiments, the coordinate system setting of the variable aperture 1 can be flexibly set according to specific actual needs.

Fig. 6 is a schematic diagram of the structure of the housing 10 and the base 20 shown in Fig. 5. Fig. 7 is a cross-sectional view of a partial structure of the variable aperture 1 shown in Fig. 4 on the B-B line in an embodiment.

As shown in FIGS. 6 and 7 , the housing 10 can be fixed to the outer periphery of the base 20. The housing 10 and the base 20 can enclose a containing space 101, that is, the interior of the variable aperture 1. The housing 10 is provided with a first through hole 11. The first through hole 11 is connected to the containing space 101. The base 20 is provided with a third through hole 21. The third through hole 21 is connected to the containing space 101. The third through hole 21 can be connected to the first through hole 11. The central axis of the first through hole 11 can coincide with the central axis of the third through hole 21.

Exemplarily, the housing 10 may include a third portion 10a and a fourth portion 10b connected to each other. The fourth portion 10b may be bent relative to the third portion 10a. The third portion 10a may be provided with a first groove 12. The opening of the first groove 12 may be formed on the surface of the third portion 10a facing the base 20. The first groove 12 may be an annular groove. In other embodiments, the first groove 12 may also be in other shapes. It should be understood that FIG. 7 illustrates the third portion 10a and the fourth portion 10b by dotted lines.

Exemplarily, the surface of the third part 10a away from the base 20 may also be convexly provided with a positioning protrusion 13, a plurality of first limiting columns 14 and a plurality of limiting blocks 15. Among them, each first limiting column 14 and its two adjacent limiting blocks 15 may constitute a limiting structure. The plurality of limiting structures may be evenly distributed along the outer periphery of the housing 10. The plurality of limiting structures may be surrounded in a ring shape. The positioning protrusion 13 may be located between any two adjacent limiting structures. It is understandable that FIG. 7 schematically shows the third part 10a and the fourth part 10b of the housing 10 through dotted lines.

For example, a plurality of first fixing columns 16 may be convexly provided on the surface of the third portion 10a away from the base 20. The plurality of first fixing columns 16 may be evenly distributed along the edge of the first through hole 11. The plurality of first fixing columns 16 may be arranged in a ring shape. In this embodiment, the number of the first fixing columns 16 is six. In other embodiments, the number of the first fixing columns 16 is not specifically limited.

Exemplarily, the base 20 may be provided with a first limiting groove 22 and a second limiting groove 23 on one side facing the third portion 10a (FIG. 5 also illustrates the first limiting groove 22 and the second limiting groove 23 from another angle). The first limiting groove 22 and the second limiting groove 23 may be symmetrically arranged relative to the central axis of the third through hole 21.

As shown in Figures 5 and 6, a side of the fourth portion 10b of the housing 10 facing the base 20 may be provided with a plurality of spaced fixing grooves 17. The opening of each fixing groove 17 may be formed on the end surface of the fourth portion 10b facing the base 20. The plurality of fixing grooves 17 may be provided around the fourth portion 10b.

Exemplarily, a plurality of fixing protrusions 24 may be provided on one side of the base 20 facing the housing 10. The plurality of fixing protrusions 24 may be arranged around the outer periphery of the base 20. The plurality of fixing protrusions 24 may be matched with the plurality of fixing grooves 17 in a one-to-one correspondence, so that the housing 10 is fixed to the base 20, which is beneficial to improve the connection stability between the housing 10 and the base 20.

Exemplarily, the fixing protrusion 24 may be provided with a communication groove 241. The communication groove 241 may be used to connect the inside of the variable aperture 1 (ie, the accommodating space 101) with the outside of the variable aperture 1.

Please refer to FIG. 2 again, and in combination with FIG. 6 , the base 20 can be fixed on the camera module 2 of the lens assembly 100. Part of the camera module 2 can pass through the third through hole 21 of the base 20 and be located in the accommodating space 101 of the variable aperture 1. In this way, the variable aperture 1 and the camera module 2 have an overlapping area in the Z-axis direction. At this time, the thickness of the lens assembly 100 in the Z-axis direction can be reduced, which is conducive to realizing a thin setting of the lens assembly 100.

It is understandable that the shapes of the housing 10 and the base 20 are not limited to the cylindrical shapes shown in Figures 3 to 6. In other embodiments, the shapes of the housing 10 and the base 20 may also be other shapes such as a cube or a prism.

Fig. 8 is a schematic structural diagram of the rotating bracket 30 shown in Fig. 5. Fig. 9 is a schematic structural diagram of the rotating bracket 30 shown in Fig. 5 from another viewing angle.

As shown in Figures 8 and 9, the rotating bracket 30 can be roughly annular. The rotating bracket 30 may include a first part 31 and a second part 32. The first part 31 may be bent relative to the second part 32. The rotating bracket 30 is provided with a second through hole 33. The second through hole 33 may pass through the second part 32. Among them, the central axis of the second through hole 33 may coincide with the central axis of the rotating bracket 30. It should be understood that in order to facilitate the description of the specific structure and shape of the rotating bracket 30, the present embodiment divides the rotating bracket 30 into two parts for description, but does not affect the rotating bracket 30 as an integrally formed structure. In other embodiments, the second part 32 may also be fixed to the first part 31 by welding or other methods. It should be understood that Figure 10 illustrates the first part 31 and the second part 32 by dotted lines.

Exemplarily, the first portion 31 may be provided with a second groove 311. The opening of the second groove 311 is located on the surface of the first portion 31 facing the second portion 32. The second groove 311 may be an annular groove and is arranged around the second portion 32. In other embodiments, the second groove 311 may also be in other shapes.

For example, the second portion 32 may be provided with a plurality of second fixing columns 321 disposed at intervals. The second fixing columns 321 may be located on the side of the second portion 32 facing away from the first portion 31. The plurality of second fixing columns 321 may be evenly distributed along the outer periphery of the second portion 32. The plurality of second fixing columns 321 may be arranged in a ring shape. In this embodiment, the number of the second fixing columns 321 is six. In other embodiments, the number of the second fixing columns 321 is not specifically limited.

For example, the first part 31 may be provided with a first mounting groove 312, a second mounting groove 313 and a third mounting groove 314 which are arranged at intervals. The openings of the first mounting groove 312, the second mounting groove 313 and the third mounting groove 314 are located on the surface of the first part 31 which faces away from the second part 32. The first mounting groove 312, the second mounting groove 313 and the third mounting groove 314 may be arranged around the first part 31. The first mounting groove 312 and the third mounting groove 314 may be arranged symmetrically relative to the central axis of the rotating bracket 30. The variable aperture 1 may also include a first friction plate 102, a second friction plate 103 and a magnet 104. The first friction plate 102 may be fixed in the first mounting groove 312. The magnet 104 may be fixed in the second mounting groove 313. The second friction plate 103 may be fixed in the third mounting groove 314. In other embodiments, the variable aperture 1 may also not include the first friction plate 102, the second friction plate 103 and the magnet 104.

Fig. 10 is a cross-sectional view of a partial structure of the variable aperture 1 shown in Fig. 4 on line B-B in one embodiment.

As shown in FIG. 10 , the rotating bracket 30 may be at least partially located in the accommodating space 101. Exemplarily, in the Z-axis direction, the first portion 31 of the rotating bracket 30 may be arranged opposite to the third portion 10a of the housing 10 and rotatably connected to the housing 10. At this time, the first portion 31 and the third portion 10a may be located between the fourth portion 10b and the second portion 32. The opening of the first groove 12 and the opening of the second groove 311 may be arranged opposite to each other and arranged along the Z-axis direction. The first groove 12 and the second groove 311 may together constitute the ball groove 51 of the variable aperture 1. Exemplarily, the shape of the first groove 12 may be compatible with the shape of the second groove 311. It should be understood that in this embodiment, the relative arrangement of the first portion 31 and the third portion 10a may be that the first portion 31 is projected along the Z-axis direction to obtain a first projection, and the third portion 10a is projected along the Z-axis direction to obtain a second projection. Wherein, the first projection and the second projection may at least partially overlap.

In addition, the second portion 32 of the rotating bracket 30 may be located in the accommodating space 101. At this time, the first through hole 11, the third through hole 21 and the second through hole 33 may be interconnected. For example, the first through hole 11, the third through hole 21 and the second through hole 33 may be coaxially arranged.

Exemplarily, the first mounting groove 312 may be disposed opposite to the first limiting groove 22. The third mounting groove 314 may be disposed opposite to the second limiting groove 23. That is, the first friction plate 102 may be disposed opposite to the first limiting groove 22. The second friction plate 103 may be disposed opposite to the second limiting groove 23.

Exemplarily, the materials of the first friction plate 102 and the second friction plate 103 can both be materials with high hardness and wear resistance, such as stainless steel or silicon carbide ceramics that have been surface hardened.

Fig. 11 is a schematic diagram of a partial structure of the variable aperture 1 shown in Fig. 5. Fig. 12 is a cross-sectional view of a partial structure of the variable aperture 1 shown in Fig. 4 on line B-B in an embodiment.

As shown in Figures 11 and 12, the ball retainer 90 can be roughly annular and surrounded by a connecting hole. The ball retainer 90 can be fixed to the surface of the first part 31 of the rotating bracket 30 facing the third part 10a. Among them, the second part 32 can pass through the connecting hole of the ball retainer 90. The ball retainer 90 can cover the second groove 311. In other embodiments, the ball retainer 90 can also be fixed to the surface of the third part 10a of the shell facing the first part 31. At this time, the ball retainer 90 can cover the first groove 12.

Exemplarily, the ball holder 90 may be provided with a plurality of through holes 91 arranged at intervals (FIG. 5 also illustrates the through holes 91 from another angle). The plurality of through holes 91 may be equally spaced around the connecting hole of the ball holder 90. The plurality of balls 50 may be arranged in the plurality of through holes 91 in a one-to-one correspondence. In addition, a portion of each ball 50 may be located in the first groove 12, a portion of which may be arranged in the through hole 91, and another portion of which may be located in the second groove 311. In this way, the rotating bracket 30 can be rotatably connected to the housing 10 through the ball 50. The friction between the rotating bracket 30 and the housing 10 is small. Exemplarily, the number of balls 50 may be greater than or equal to three. In this embodiment, the number of through holes 91 and balls 50 are both three. In this way, the plurality of balls 50 can support the housing 10 more stably and avoid tilting between the housing 10 and the rotating bracket 30. In other embodiments, the number of through holes 91 and balls 50 is not specifically limited.

Exemplarily, the gasket 80 may be roughly annular and surround a connecting hole. The gasket 80 may be provided with a plurality of avoidance grooves 81 arranged at intervals. The plurality of avoidance grooves 81 may be distributed at equal intervals around the outer periphery of the gasket 80. Among them, the opening of each avoidance groove 81 is located on the peripheral side wall of the gasket 80. The gasket 80 may be fixed to the side of the second part 32 of the rotating bracket 30 away from the first part 31. At this time, the connecting hole of the gasket 80 may be connected to the second through hole 33 of the rotating bracket 30. In this embodiment, the number of the avoidance grooves 81 of the gasket 80 is six. At this time, the plurality of second fixing columns 321 of the rotating bracket 30 are located in the plurality of avoidance grooves 81 in a one-to-one correspondence. In this way, the gasket 80 can be prevented from rotating relative to the rotating bracket 30 through the cooperation of the second fixing column 321 and the avoidance groove 81.

FIG. 13 is a schematic diagram of a partial structure of the variable aperture 1 shown in FIG. 5 .

As shown in FIG. 13 , in the present embodiment, the number of blades 60 is six. The shapes and sizes of the blades 60 are the same. The structure of the blade 60 will be specifically described below by taking one of the blades 60 as an example. The blade 60 is provided with a rotating hole 61 and a guide hole 62 arranged at intervals. The rotating hole 61 can be located at the end of the blade 60. The guide hole 62 can be located in the middle of the blade 60. Among them, the rotating hole 61 can be a circular hole. The guide hole 62 can be a strip hole. Exemplarily, the guide hole 62 can include a first end wall 621 and a second end wall 622 arranged opposite to each other. The first end wall 621 can be arranged close to the rotating hole 61 relative to the second end wall 622.

Exemplarily, the rotation hole 61 of the blade 60 can be rotatably connected to one of the first fixing columns 16 of the housing 10. The guide hole 62 of the blade 60 can be slidably connected to one of the second fixing columns 321 of the rotating bracket 30. It should be understood that in other embodiments, the positions of the rotation hole 61 and the first fixing column 16 can be swapped. The positions of the guide hole 62 and the second fixing column 321 can also be swapped. In other words, the first fixing column 16 and the second fixing column 321 can be set on the blade 60. The rotation hole 61 can be set on the housing 10. The guide hole 62 can be set on the rotating bracket 30.

As shown in FIG13 , the plurality of blades 60 may be distributed in an annular shape and together surround the aperture hole 1a. The aperture hole 1a may be arranged opposite to the first through hole 11 and sequentially connect the first through hole 11, the connecting hole of the gasket 80, the second through hole 33 and the third through hole 21 (see FIG12 ). Exemplarily, the central axis of the aperture hole 1a may coincide with the central axis of the first through hole 11.

FIG. 14 is a schematic diagram of a partial structure of the variable aperture 1 shown in FIG. 5 .

As shown in FIG. 14 , the cover plate 70 may be roughly annular and surround a connecting hole. The cover plate 70 may be provided with a cover plate positioning hole 71 and a plurality of cover plate limiting grooves 72 arranged at intervals. The plurality of cover plate limiting grooves 72 may be evenly distributed along the outer periphery of the cover plate 70. The cover plate positioning hole 71 may be located between any two adjacent cover plate limiting grooves 72. In the present embodiment, the number of the cover plate limiting grooves 72 is six. The limiting structures of the plurality of shells 10 may be located in the plurality of cover plate limiting grooves 72 in a one-to-one correspondence. The positioning protrusion 13 of the shell 10 may be located in the cover plate positioning hole 71. In this way, by the cooperation between the cover plate limiting groove 72 and the limiting structure, and the cooperation between the positioning protrusion 13 and the cover plate positioning hole 71, the cover plate 70 may be fixed to the shell 10, while preventing the cover plate 70 from rotating relative to the shell 10.

Exemplarily, the cover plate 70 may be provided with a plurality of first avoidance holes 73 and a plurality of second avoidance holes 74. The plurality of first avoidance holes 73 may be arranged in a ring shape. The plurality of second avoidance holes 74 may be arranged in a ring shape. Among them, the plurality of second avoidance holes 74 may be evenly distributed around the connecting hole of the cover plate 70. The plurality of first avoidance holes 73 may be evenly distributed around the plurality of cover plate limiting grooves 72. The first avoidance hole 73 may be a circular hole. The second avoidance hole 74 may be a strip hole. In this embodiment, the number of the first avoidance holes 73 and the number of the second avoidance holes 74 are both six. The plurality of first fixing columns 16 may be located in the plurality of first avoidance holes 73 in a one-to-one correspondence. The plurality of second fixing columns 321 may be located in the plurality of second avoidance holes 74 in a one-to-one correspondence. Among them, the second avoidance hole 74 may expose at least part of the guide hole 62.

The above specifically describes the connection relationship between the blade 60, the housing 10, and the rotating bracket 30. The following specifically describes the relationship between the movement of the blade 60 and the size of the aperture 1a. In this embodiment, when the rotating bracket 30 rotates relative to the housing 10, the blade 60 rotates relative to the housing 10, and the blade 60 slides relative to the rotating bracket 30, and the aperture 1a changes. The details are described below.

As shown in FIG13 , when the variable aperture 1 is in the first state, the second fixing column 321 of the rotating bracket 30 is disposed close to the first end wall 621 of the guide hole 62. At this time, the aperture of the aperture hole 1a is the largest. In this way, the luminous flux of the ambient light entering the variable aperture 1 through the aperture hole 1a is the largest.

When the variable aperture 1 is in the second state, the second fixing column 321 of the rotating bracket 30 is disposed close to the second end wall 622 of the guide hole 62. At this time, the aperture of the aperture hole 1a is the smallest, so that the luminous flux of the ambient light entering the variable aperture 1 through the aperture hole 1a is the smallest.

FIG. 15 is a schematic structural diagram of a part of the variable aperture 1 shown in FIG. 13 being transformed from the second state to the first state.

As shown in FIG. 13 and FIG. 15 , when the variable aperture 1 is converted from the first state to the second state, the rotating bracket 30 rotates relative to the housing 10 along the first direction a1 (the first direction a1 in this embodiment is counterclockwise), and the rotating bracket 30 can drive the blade 60 to move through the second fixing column 321. At this time, the blade 60 can rotate relative to the housing 10 along the third direction b1 (the third direction b1 in this embodiment is clockwise) with the first fixing column 16 as the rotation axis. The second fixing column 321 can be converted from the state of the first end wall 621 close to the guide hole 62 to the state of the second fixing column 321 close to the second end wall 622 of the guide hole 62.

When the variable aperture 1 is converted from the second state to the first state, the rotating bracket 30 rotates relative to the housing 10 along the second direction a2 (the second direction a2 in this embodiment is clockwise), and the rotating bracket 30 can drive the blade 60 to move through the second fixing column 321. At this time, the blade 60 can rotate relative to the housing 10 along the fourth direction b2 (the fourth direction b2 in this embodiment is counterclockwise) with the first fixing column 16 as the rotation axis. The second fixing column 321 can be converted from the state of the second end wall 622 close to the guide hole 62 to the state of the second fixing column 321 close to the first end wall 621 of the guide hole 62.

The above specifically introduces the relationship between the movement of the blade 60 and the size of the aperture hole 1a. The following will specifically introduce the drive mechanism 40 of the variable aperture 1 in conjunction with the relevant drawings. The drive mechanism 40 can be used to drive the rotating bracket 30 to rotate relative to the housing 10.

FIG. 16 is a schematic diagram of the exploded structure of the driving mechanism 40 shown in FIG. 5 .

As shown in FIG16 , the driving mechanism 40 may include a resonator 41, a bracket 42, a spring 43, a support member 44, a circuit board 45, and a position sensor 46. For example, the circuit board 45 may be a flexible circuit board. The position sensor 46 may be a Hall sensor. In other embodiments, the circuit board 45 may also be a hard circuit board, or a hard-soft circuit board. The position sensor 46 may also be other types of sensors. The support member 44 may be a support ball.

Fig. 17 is a schematic diagram of the structure of the bracket 42 shown in Fig. 16. Fig. 18 is a schematic diagram of the structure of the bracket 42 shown in Fig. 17 at another angle.

As shown in Figures 17 and 18, the bracket 42 may include an annular portion 421, a first support portion 422 and a second support portion 423. The first support portion 422 and the second support portion 423 may be fixed to the circumferential side of the annular portion 421 at intervals. Exemplarily, the first support portion 422 and the second support portion 423 may be symmetrically arranged relative to the central axis of the annular portion 421. Both the first support portion 422 and the second support portion 423 may protrude relative to the annular portion 421 along the Z-axis direction. It should be understood that in order to facilitate the description of the specific structure and shape of the bracket 42, the bracket 42 is divided into three parts for description in this embodiment, but it does not affect the bracket 42 being an integrally formed structure. Figure 17 schematically shows the annular portion 421, the first support portion 422 and the second support portion 423 by dotted lines. In other embodiments, the first support portion 422 and the second support portion 423 may also be fixed to the annular portion 421 by welding or other methods.

Exemplarily, the first support portion 422 may include a first sub-end surface 4221 and a second sub-end surface 4222 disposed in opposite directions. The second support portion 423 may include a third sub-end surface 4231 and a fourth sub-end surface 4232 disposed in opposite directions. The annular portion 421 may include a fifth sub-end surface 4211 and a sixth sub-end surface 4212 disposed in opposite directions. The first sub-end surface 4221, the third sub-end surface 4231 and the fifth sub-end surface 4211 may together constitute a first end surface 42a of the bracket 42. The second sub-end surface 4222, the fourth sub-end surface 4232 and the sixth sub-end surface 4212 may together constitute a second end surface 42b of the bracket 42.

Exemplarily, the first support portion 422 may be provided with a first fixing groove 4223. The opening of the first fixing groove 4223 may be formed at the first sub-end surface 4221 of the first support portion 422. The second support portion 423 may be provided with a second fixing groove 4233. The opening of the second fixing groove 4233 may be formed at the third sub-end surface 4231 of the second support portion 423. The first fixing groove 4223 and the second fixing groove 4233 may be symmetrically arranged relative to the center of the bracket 42.

Exemplarily, the bracket 42 may be provided with a bracket through hole 42c. The bracket through hole 42c may be located at the center of the annular portion 421 and pass through the fifth sub-end surface 4211 and the sixth sub-end surface 4212 of the annular portion 421. The sixth sub-end surface 4212 of the annular portion 421 may be provided with a plurality of spaced positioning posts 4213. The plurality of positioning posts 4213 may be evenly distributed around the bracket through hole 42c. In this embodiment, the number of positioning posts 4213 is four. In other embodiments, the number of positioning posts 4213 is not specifically limited.

FIG. 19 is a schematic structural diagram of the resonator 41 of the driving mechanism 40 shown in FIG. 16 .

As shown in FIG19 , the resonator 41 may include a main body 411, a first driving foot 412, and a second driving foot 413. The main body 411 may include a first surface 411a and a second surface 411b disposed in opposite directions. The first driving foot 412 and the second driving foot 413 may be fixed to the first surface 411a of the main body 411. The main body 411 may also include a first end 4111 and a second end 4112. The first driving foot 412 may be located at the first end 4111. The second driving foot 413 may be located at the second end 4112. In some embodiments, the first driving foot 412 and/or the second driving foot 413 may also be located at other positions of the main body 411. In other embodiments, the resonator 41 may also not include the second driving foot 413.

Exemplarily, the main body 411 may include a first elastic body 4113 and a first piezoelectric ceramic 4114. The material of the first elastic body 4113 may be a metal material such as stainless steel. The first elastic body 4113 and the first piezoelectric ceramic 4114 may be stacked along the Z-axis direction. Exemplarily, the first elastic body 4113 may be fixed to one side of the first piezoelectric ceramic 4114 by bonding. The surface of the first elastic body 4113 away from the first piezoelectric ceramic 4114 may constitute the first surface 411a of the main body 411. The side surface of the first piezoelectric ceramic 4114 away from the first elastic body 4113 may constitute the second surface 411b of the main body 411.

Exemplarily, the first piezoelectric ceramic 4114 may include a first end 4114a and a second end 4114b. The first elastic body 4113 may include a third end 4113a and a fourth end 4113b. The first end 4114a and the third end 4113a may together constitute the first end 4111 of the body 411. The second end 4114b and the fourth end 4113b may together constitute the second end 4112 of the body 411. The first driving foot 412 and the second driving foot 413 may be fixed to the side of the first elastic body 4113 away from the first piezoelectric ceramic 4114 by bonding. The first driving foot 412 may be fixed to the third end 4113a. The second driving foot 413 may be fixed to the fourth end 4113b. In some embodiments, the first driving foot 412, the second driving foot 413 and the first elastic body 4113 may be an integrally formed structure. In other words, both ends of the first elastic body 4113 may protrude toward the mover 1 c to form a first driving foot 412 and a second driving foot 413 .

Exemplarily, the material of the first driving foot 412 and the second driving foot 413 may also be a metal material such as stainless steel. In some embodiments, the first driving foot 412, the second driving foot 413 and the first elastic body 4113 may also be an integrally formed structure.

Exemplarily, the resonator 41 may be roughly in the shape of an elongated strip. The elongated strip refers to a component whose cross-sectional dimension is much smaller than its length dimension. In this embodiment, the cross-sectional dimension of the resonator 41 in the XZ plane is much smaller than the length dimension of the resonator 41 in the Y-axis direction.

Fig. 20 is a partial structural diagram of the driving mechanism 40 shown in Fig. 16. Fig. 21 is a partial structural diagram of the driving mechanism 40 shown in Fig. 16.

As shown in FIGS. 19 and 20 , the circuit board 45 may include a first sub-board 451 and a second sub-board 452 connected in sequence. The resonator 41 may be fixed to the end of the first sub-board 451 away from the second sub-board 452. The second surface 411b of the resonator 41 may be fixed to the first sub-board 451 by low-temperature welding or bonding. At this time, the first piezoelectric ceramic 4114 of the resonator 41 may be electrically connected to the circuit board 45. The circuit board 45 may input a pulse width modulation (PWM) signal to the first piezoelectric ceramic 4114 so that the first piezoelectric ceramic 4114 may be deformed under the control of the signal. The position sensor 46 may be fixed to the end of the second sub-board 452 close to the first sub-board 451. The resonator 41 and the position sensor 46 may be located on the same side of the circuit board 45.

It should be understood that in order to facilitate the description of the specific structure and shape of the circuit board 45, the circuit board 45 is divided into two parts in this embodiment, but it does not affect the circuit board 45 being an integrated structure. FIG20 schematically shows the first sub-board 451 and the second sub-board 452 through dotted lines.

Exemplarily, the first piezoelectric ceramic 4114 may be a multilayer piezoelectric ceramic, so that the driving voltage of the piezoelectric ceramic can be effectively reduced.

As shown in FIGS. 20 and 21 , the end of the first sub-board 451 of the circuit board 45 away from the second sub-board 452 can be fixed in the first fixing groove 4223 of the bracket 42. The resonator 41 can be fixed in the first fixing groove 4223 through the circuit board 45. The support member 44 can be located in the second fixing groove 4233 of the bracket 42. At this time, the resonator 41 and the support member 44 can be symmetrically arranged relative to the central axis of the bracket 42.

Fig. 22 is a schematic diagram of the structure of the driving mechanism 40 shown in Fig. 16. Fig. 23 is a schematic diagram of the structure of the driving mechanism 40 shown in Fig. 22 at another angle.

As shown in Figures 22 and 23, the spring piece 43 may include a first extension portion 431, a second extension portion 432, a third extension portion 433, a fourth extension portion 434 and a mounting portion 435. The mounting portion 435 may be generally annular. The mounting portion 435 may surround a connecting hole. The first extension portion 431, the second extension portion 432, the third extension portion 433 and the fourth extension portion 434 may surround and connect the outer periphery of the mounting portion 435 in sequence. Exemplarily, the first extension portion 431, the second extension portion 432, the third extension portion 433 and the fourth extension portion 434 may be distributed at equal intervals around the outer periphery of the mounting portion 435.

Exemplarily, the mounting portion 435 may be provided with a plurality of positioning holes 4351 arranged at intervals. The plurality of positioning holes 4351 may be evenly distributed around the connecting hole of the mounting portion 435. In the present embodiment, the number of the positioning holes 4351 is four. The plurality of positioning posts 4213 of the bracket 42 may be located in the plurality of positioning holes 4351 in a one-to-one correspondence. In this way, the spring sheet 43 may be fixed to the second end face 42b of the bracket 42 (i.e., the sixth sub-end face 4212 of the annular portion 421 in the present embodiment) by the cooperation between the positioning posts 4213 and the positioning holes 4351. Exemplarily, the first support portion 422 of the bracket 42 may be located between the first extension portion 431 and the second extension portion 432 of the spring sheet 43. The position sensor 46 may be located between the second extension portion 432 and the third extension portion 433 of the spring sheet 43. The second support portion 423 of the bracket 42 may be located between the third extension portion 433 and the fourth extension portion 434 of the spring sheet 43.

Fig. 24 is a schematic structural diagram of the base 20 and the driving mechanism 40 of the variable aperture 1 shown in Fig. 5. Fig. 25 is a cross-sectional view of an embodiment of the variable aperture 1 shown in Fig. 4 on the B-B line. Fig. 26 is a cross-sectional view of an embodiment of the variable aperture 1 shown in Fig. 4 on the C-C line.

As shown in Figures 24 and 25, the first extension portion 431, the second extension portion 432, the third extension portion 433 and the fourth extension portion 434 of the spring 43 can be fixed to the multiple fixed protrusions 24 of the base 20 respectively. The spring 43 can apply an upward force (in this embodiment, that is, along the positive direction of the Z axis) to the bracket 42. Under the action of the spring 43, the bracket 42 can be suspended from the base 20. In other words, the second end surface 42b of the bracket 42 can be out of contact with the base 20. It can be understood that the spring 43 applies a force along the positive direction of the Z axis to the bracket 42 by, but not limited to, the following methods. For example, before the spring 43 is installed on the base 20, a pre-tension is applied to the first extension portion 431, the second extension portion 432, the third extension portion 433 and the fourth extension portion 434 of the spring 43, and then the spring 43 is installed on the base 20. At this time, the structure of the spring sheet 43 itself will generate a contraction force in order to resist the pre-tensioning force, and the contraction force can apply a force along the positive direction of the Z axis to the bracket 42.

Exemplarily, at least a portion of the first support portion 422 of the bracket 42 may be located in the first limiting groove 22. At least a portion of the second support portion 423 of the bracket 42 may be located in the second limiting groove 23. At least a portion of the second sub-board 452 of the circuit board 45 may be connected to the outside of the variable aperture 1 through the connecting groove 241 of the base 20. In this way, the external device of the variable aperture 1 may input an electrical signal to the resonator 41 and the position sensor 46 through the second sub-board 452 of the circuit board 45.

As shown in FIG. 25 and FIG. 26 , the first mounting groove 312 of the rotating bracket 30 can be arranged opposite to the first fixed groove 4223 along the Z-axis direction. The third mounting groove 314 of the rotating bracket 30 can be arranged opposite to the second fixed groove 4233 along the Z-axis direction. At this time, the first friction plate 102 fixed to the first mounting groove 312 can be arranged opposite to the first fixed groove 4223. The second friction plate 103 fixed in the third mounting groove 314 can be arranged opposite to the second fixed groove 4233. When the bracket 42 is subjected to the force of the spring sheet 43, the bracket 42 can drive the resonator 41 to squeeze the rotating bracket 30 under the force of the spring sheet 43. Among them, the first driving foot 412 and the second driving foot 413 of the resonator 41 respectively abut the first friction plate 102, and the support member 44 can abut the second friction plate 103. That is, the first piezoelectric ceramic 4114 can be squeezed on the rotating bracket 30 through the first elastic body 4113 under the force of the spring sheet 43. At this time, the resonator 41 and at least part of the rotating bracket 30 can be stacked along the Z-axis direction. The resonator 41 and the support member 44 can be spaced apart and located on a side of the rotating bracket 30 away from the housing 10, and jointly support the first part 31 of the rotating bracket 30. Among them, the contact surface between the first driving foot 412 and the first friction plate 102 is the first contact surface 4121. The contact surface between the second driving foot 413 and the first friction plate 102 is the second contact surface 4131.

In other implementations, the resonator 41 may not include the first elastic body 4113 . In this case, the end of the first piezoelectric ceramic 4114 may be directly pressed onto the rotating bracket 30 under the action of the spring 43 .

Fig. 27 is a cross-sectional view of an embodiment of the variable aperture 1 shown in Fig. 4 on line D-D.

As shown in FIG. 27 , the second mounting groove 313 of the rotating bracket 30 can be arranged opposite to the position sensor 46. At this time, the magnet 104 installed in the second mounting groove 313 can be arranged opposite to the position sensor 46. In this embodiment, the position sensor 46 can be used to detect the magnetic field strength of the magnet 104. In this way, when the rotating bracket 30 rotates relative to the housing 10, the rotating bracket 30 also rotates relative to the base 20 at the same time. At this time, the magnet 104 will be in different positions. The position sensor 46 can detect the magnetic field strength of the magnet 104 at different positions. In this way, the magnetic field strength detected by the position sensor 46 can confirm the rotation angle of the rotating bracket 30 relative to the housing 10 and the base 20, so that the state of the variable aperture 1 can be accurately confirmed, that is, the aperture size of the aperture hole 1a of the variable aperture 1 can be accurately confirmed, and then the light flux in the variable aperture 1 can be accurately controlled.

The structure of the driving mechanism 40 is described in detail above in conjunction with the relevant drawings. The driving principle of the driving mechanism 40 will be described in detail below in conjunction with the relevant drawings.

Fig. 28 is a schematic diagram of the structure of the resonator 41 shown in Fig. 16 at another viewing angle. Fig. 29 is a schematic diagram of the structure of the resonator 41 shown in Fig. 28 at yet another viewing angle.

As shown in FIG28 and FIG29 , the resonator 41 may include a first vibrating portion 414 and a second vibrating portion 415 connected in sequence along the length direction (i.e., the Y-axis direction). It is understood that the first vibrating portion 414 and the second vibrating portion 415 are schematically separated by a dotted line in both FIG28 and FIG29 . The first vibrating portion 414 includes a first driving foot 412. The second vibrating portion 415 includes a second driving foot 413.

Exemplarily, the second surface 411b of the resonator 41 may be provided with a first input terminal 416, a second input terminal 417, a third input terminal 418, and a fourth input terminal 419. The first input terminal 416 and the second input terminal 417 may be located at the first vibration part 414. The third input terminal 418 and the fourth input terminal 419 may be located at the second vibration part 415. In this way, the external signal of the variable aperture 1 may be transmitted to the first input terminal 416, the second input terminal 417, the third input terminal 418, and the fourth input terminal 419 respectively via the circuit board 45 (as shown in FIG. 20 ).

Exemplarily, the first input terminal 416 and the second input terminal 417 may be located at the first end 4114a of the first piezoelectric ceramic 4114. The first input terminal 416 and the second input terminal 417 may be spaced apart along the X-axis direction. The third input terminal 418 and the fourth input terminal 419 may be located at the second end 4114b of the first piezoelectric ceramic 4114. The third input terminal 418 and the fourth input terminal 419 may be spaced apart along the X-axis direction. At this time, the circuit board 45 may input PWM signals to both ends of the first piezoelectric ceramic 4114 respectively. The polarization direction of the first piezoelectric ceramic 4114 in the resonator 41 may be along the thickness direction of the first piezoelectric ceramic 4114 (i.e., the Z-axis direction).

Exemplarily, the first input terminal 416, the second input terminal 417, the third input terminal 418, and the fourth input terminal 419 may all include an electrode sheet. The first piezoelectric ceramic 4114 may be electrically connected to the circuit board 45 through the electrode sheet. In other embodiments, the circuit board 45 may also be directly electrically connected to the first input terminal 416, the second input terminal 417, the third input terminal 418, and the fourth input terminal 419 of the first piezoelectric ceramic 4114. Alternatively, the circuit board 45 may also be electrically connected to the first piezoelectric ceramic 4114 in other ways.

Fig. 30 is a schematic diagram of signal input to the first input terminal 416 shown in Fig. 29. Fig. 31 is a schematic diagram of signal input to the second input terminal 417 shown in Fig. 29. Fig. 32 is a schematic diagram of the composite signal of the first input terminal 416 and the second input terminal 417 shown in Fig. 29.

As shown in Figures 29 to 31, a first signal is input to the first input terminal 416, and a second signal is input to the second input terminal 417. The value of the first signal can be a first value or 0. The value of the second signal can be a second value or 0. The first signal and the second signal have a certain phase difference. The phase difference between the first signal and the second signal can be in the range of π/4 to 3π/4. Exemplarily, the phase difference between the first signal and the second signal can be π/4.

Exemplarily, the voltage of the signal input to the first input terminal 416 and the second input terminal 417 may be 3.2V, that is, the first value and the second value may both be 3.2. The period of the first signal and the second signal may be T. When in the period of 0 to T/4, the value of the voltage _VA of the first input terminal 416 may be 3.2V, that is, the first signal is the first value. The voltage _VB of the second input terminal 417 may be 0V, that is, the second signal is 0. At this time, the value of the potential difference _UAB between the first input terminal 416 and the second input terminal 417 may be 3.2V. When in the period of T/4 to 3T/4, the value of the voltage _VA of the first input terminal 416 may be 0V, that is, the first signal is 0. The voltage _VB of the second input terminal 417 may be 3.2V, that is, the second signal is the second value. At this time, the value of the potential difference _UAB between the first input terminal 416 and the second input terminal 417 may be -3.2V. When in the 3T/4 to T period, the voltage _VA of the first input terminal 416 may be 3.2V, that is, the first signal is 3.2. The voltage _VB of the second input terminal 417 may be 0V, that is, the second signal is 0. At this time, the potential difference _UAB between the first input terminal 416 and the second input terminal 417 may be 3.2V. In this way, the above signal input is repeated, so that the first signal and the second signal can be synthesized to obtain the first signal as shown in FIG32.

Fig. 33 is a schematic diagram of signal input to the third input terminal 418 shown in Fig. 29. Fig. 34 is a schematic diagram of signal input to the fourth input terminal 419 shown in Fig. 29. Fig. 35 is a schematic diagram of the composite signal of the third input terminal 418 and the fourth input terminal 419 shown in Fig. 29.

As shown in Figures 29, 33 and 34, the third signal is input to the third input terminal 418, and the fourth signal is input to the fourth input terminal 419. The value of the third signal can be the third value or 0. The value of the fourth signal can be the fourth value or 0. The third signal and the fourth signal have a certain phase difference. The phase difference between the third signal and the fourth signal can be in the range of π/4 to 3π/4. Exemplarily, the phase difference between the third signal and the fourth signal can be π/4.

Exemplarily, the voltage of the signal input to the third input terminal 418 and the fourth input terminal 419 may be 3.2V, that is, the third value and the fourth value may both be 3.2. The period of the third signal and the fourth signal may be T. When in the period of 0 to T/2, the value of the voltage _VC of the third input terminal 418 may be 3.2V, that is, the third value is 3.2. The voltage _VD of the fourth input terminal 419 may be 0V, that is, the fourth value is 0. At this time, the value of the potential difference _UCD between the third input terminal 418 and the fourth input terminal 419 may be 3.2V. When in the period of T/2 to T, the value of the voltage _VC of the third input terminal 418 may be 0V, that is, the third value is 0. The voltage _VD of the fourth input terminal 419 may be 3.2V, that is, the fourth value is 3.2. At this time, the value of the potential difference _UCD between the third input terminal 418 and the fourth input terminal 419 may be -3.2V. In this way, the above signal input is repeated, so that the third signal and the fourth signal can be synthesized to obtain the second signal as shown in Figure 34.

Exemplarily, the phase difference between the first signal and the second signal may be π/4.

The above specifically introduces the formation process of the first signal and the second signal. The following will specifically introduce how the first signal and the second signal drive the first piezoelectric ceramic 4114 to move in conjunction with the accompanying drawings.

Fig. 36 is a schematic diagram of the resonator 41 shown in Fig. 28 generating stretching vibration. Fig. 37 is a schematic diagram of the resonator 41 shown in Fig. 28 generating bending vibration.

As shown in FIG28, FIG32 and FIG34, the peak value of the first signal is 3.2V, the peak value of the second signal is 3.2V, and the period of the first signal and the second signal is T. When in the period of 0 to T/4, the value of the first signal is 3.2V, and the value of the second signal is 3.2V. At this time, the first piezoelectric ceramic 4114 located in the first vibration part 414 can be extended along the Y-axis direction, and the first piezoelectric ceramic 4114 located in the second vibration part 415 can be extended along the Y-axis direction, and the resonator 41 can generate an extension motion along the Y-axis direction (as shown in FIG36).

When in the period from T/4 to T/2, the value of the first signal is -3.2 V, and the value of the second signal is 3.2 V. At this time, the first piezoelectric ceramic 4114 located in the first vibration part 414 can shrink along the Y-axis direction, and the first piezoelectric ceramic 4114 located in the second vibration part 415 can stretch along the Y-axis direction, so the resonator 41 can generate bending motion along the Z-axis direction (as shown in FIG. 37 ).

When in the period from T/2 to 3T/4, the value of the first signal is -3.2 V, and the value of the second signal is -3.2 V. At this time, the first piezoelectric ceramic 4114 located in the first vibration part 414 can shrink along the Y-axis direction, and the first piezoelectric ceramic 4114 located in the second vibration part 415 can shrink along the Y-axis direction, and the resonator 41 can generate shrinkage motion along the Y-axis direction (as shown in FIG. 36 ).

When in the 3T/4 to T period, the value of the first signal is 3.2 V, and the value of the second signal is -3.2 V. At this time, the first piezoelectric ceramic 4114 located in the first vibration part 414 can be stretched along the Y-axis direction, and the first piezoelectric ceramic 4114 located in the second vibration part 415 can be contracted along the Y-axis direction, and the resonator 41 can generate bending motion along the Z-axis direction (as shown in FIG. 37 ). It should be understood that the resonator 41 will repeat the above motion in subsequent multiple periods.

It can be understood that, through the coordination of the first signal and the second signal, the resonator 41 can sequentially generate an elongation motion along the Y-axis direction, a bending motion along the Z-axis direction, a contraction motion along the Y-axis direction, and a bending motion along the Z-axis direction in one cycle, and this cycle is repeated, so that the resonator 41 can generate a telescopic vibration along the Y-axis direction and a bending vibration along the Z-axis direction, thereby synthesizing an elliptical motion. At this time, the first driving foot 412 and the second driving foot 413 can also form an elliptical motion. In this way, the first driving foot 412 and the second driving foot 413 can drive the rotating bracket 30 to rotate.

In other words, the variable aperture 1 of this embodiment inputs PMW signals (i.e., the first signal and the second signal) with a certain phase difference to the first end 4111 and the second end 4112 of the resonator 41, respectively, so that the resonator 41 can generate a telescopic vibration along its length direction (in this embodiment, the Y-axis direction) and a bending vibration along its thickness direction (in this embodiment, the Z-axis direction), thereby forming an elliptical motion at the first driving foot 412 and the second driving foot 413. In this way, the rotating bracket 30 can be driven to rotate through the elliptical motion of the first driving foot 412 and the second driving foot 413.

In this embodiment, when a third signal having a certain phase difference with the first signal is input to the first vibration part 414 of the resonator 41, and a fourth signal having a certain phase difference with the second signal is input to the second vibration part 415 of the resonator 41, the first driving foot 412 and the second driving foot 413 can generate an elliptical motion in the opposite direction to that when the first signal and the second signal are input, and a driving force in the opposite direction. The phase difference between the first signal and the third signal and the phase difference between the second signal and the fourth signal can be the same. Exemplarily, the phase difference between the first signal and the third signal can be -π/2.

In some embodiments, the ratio of the length of the longest side of the cross section of the resonator 41 to the length of the resonator may be in the range of one tenth to one third. In this way, the frequency of the stretching vibration and the frequency of the bending vibration of the resonator 41 may be closer, so that the first driving foot 412 and the second driving foot 413 can better synthesize an elliptical motion.

In other embodiments, the resonator 41 may also be other structures or forms capable of generating a driving force along the tangential direction of the aperture hole 1 a .

Fig. 38 is an enlarged schematic diagram of the variable aperture 1 shown in Fig. 26 at positions E1 and E2. Fig. 39 is an enlarged schematic diagram of the variable aperture 1 shown in Fig. 26 at positions E1 and E2.

As shown in FIG. 26 and FIG. 38 , when the first signal and the second signal are input to the two ends of the first piezoelectric ceramic 4114, respectively, the first contact surface 4121 of the first driving foot 412 and the second contact surface 4131 of the second driving foot 413 can both generate elliptical motion in the clockwise direction. The first contact surface 4121 and the second contact surface 4131 are deformed. At this time, friction is generated between the first contact surface 4121 and the first friction plate 102. Friction is generated between the second contact surface 4131 and the first friction plate 102. The resonator 41 can drive the rotating bracket 30 to rotate along the first direction a1 (i.e., counterclockwise).

When the first and second signals are stopped from being input to the first piezoelectric ceramic 4114, that is, when the variable aperture 1 is powered off, the first driving foot 412 and the second driving foot 413 stop moving. At this time, the first contact surface 4121 of the first driving foot 412 generates static friction with the first friction plate 102. The second contact surface 4131 of the second driving foot 413 generates static friction with the first friction plate 102. The static friction generated by the two can be used as the self-locking force of the variable aperture 1 to control the rotating bracket 30 to stop rotating, so as to maintain the size of the aperture hole 1a unchanged.

As shown in FIG. 26 and FIG. 39, when the third signal and the fourth signal are input to the two ends of the first piezoelectric ceramic 4114, respectively, the first contact surface 4121 of the first driving foot 412 and the second contact surface 4131 of the second driving foot 413 can both generate elliptical motion in the counterclockwise direction. The first contact surface 4121 and the second contact surface 4131 are deformed. At this time, friction is generated between the first contact surface 4121 and the first friction plate 102. The second contact surface 4131 and the first friction plate 102 generate friction. The resonator 41 can drive the rotating bracket 30 to rotate along the second direction a2 (i.e., clockwise).

When the third signal and the fourth signal are stopped from being input to the first piezoelectric ceramic 4114, that is, when the variable aperture 1 is powered off, the first driving foot 412 and the second driving foot 413 stop moving. At this time, the first contact surface 4121 of the first driving foot 412 generates static friction with the first friction plate 102. The second contact surface 4131 of the second driving foot 413 generates static friction with the first friction plate 102. The static friction generated by the two can be used as the self-locking force of the variable aperture 1 to control the rotating bracket 30 to stop rotating, thereby maintaining the size of the aperture hole 1a unchanged.

It is understandable that the conventional variable aperture 1 generally controls the size of the aperture hole 1a through the magnet 104 and the coil, which makes the conventional variable aperture 1 easy to change slightly due to the upper limit of the magnetic force of the magnet 104 and the coil, that is, the range of change of the aperture hole 1a of the conventional variable aperture 1 is limited. At the same time, the variable aperture 1 driven by magnetoelectricity is easily affected by magnetic interference, resulting in that the size of the aperture hole 1a of the variable aperture 1 is not easy to be accurately adjusted. The variable aperture 1 in this embodiment applies a PWM signal (that is, the first signal and the second signal) with a phase difference to the two ends of the first piezoelectric ceramic 4114 of the resonator 41, and simultaneously excites the telescopic vibration of the resonator 41 along its length direction and the bending vibration along its thickness direction, so that the first driving foot 412 and the second driving foot 413 of the resonator 41 are coupled to generate an elliptical motion in the same direction. In this way, by controlling the first driving foot 412 and the second driving foot 413 to perform an elliptical motion, the rotating bracket 30 is driven to rotate relative to the housing 10, thereby adjusting the size of the aperture hole 1a. Compared with the magnetoelectrically driven variable aperture 1, the variable aperture 1 of this embodiment is piezoelectrically driven, and the variation range of the aperture hole 1a is not affected by the magnetic force of the magnet 104 and the coil, and the size of the aperture hole 1a can be accurately adjusted.

Secondly, the variable aperture 1 of this embodiment is piezoelectrically driven, and the resonator 41 has a large driving stroke. At the same time, the driving force generated at the first driving foot 412 and the second driving foot 413 is larger, so that the resonator 41 can drive the rotating bracket 30 to rotate quickly. In other words, compared with the variable aperture 1 driven by magnetoelectricity, the variable aperture 1 of this embodiment can achieve rapid switching of the size of the aperture hole 1a in a large range through piezoelectric driving, which is conducive to improving the response speed of the variable aperture 1.

In addition, the variable aperture 1 in this embodiment can achieve self-locking when powered off and maintain the size of the aperture hole 1a unchanged, and there is no need to set an additional locking structure inside the variable aperture 1, which is conducive to realizing the miniaturization of the variable aperture 1. At the same time, the variable aperture 1 does not need to be powered on all the time, and there is no additional power consumption after power off, which is conducive to improving the battery life of the camera module 2.

In addition, the resonator 41 of this embodiment is in the shape of an elongated strip, and its cross-sectional dimension is much smaller than its length dimension, that is, the entire resonator 41 is thin, which is conducive to realizing a thin configuration of the variable aperture 1.

Finally, the overall structure of the variable aperture 1 of this embodiment also has some advantages, as follows:

First, at least part of the housing 10 of the variable aperture 1 of the present embodiment, at least part of the rotating bracket 30, and the resonator 41 can be stacked along the thickness direction (i.e., the Z-axis direction) of the variable aperture 1. The opening of the first groove 12 of the housing 10 and the opening of the second groove 311 of the rotating bracket 30 are arranged opposite to each other, and are stacked along the thickness direction of the variable aperture 1. In this way, the housing 10 and the first groove 12 can be integrally formed, and the rotating bracket 30 and the second groove 311 can be integrally formed, which is conducive to ensuring the coaxiality of the first through hole 11 of the housing 10 and the second through hole 33 of the rotating bracket 30, thereby avoiding the lateral posture difference of the variable aperture 1 when adjusting the size of the aperture hole 1a, which is conducive to achieving accurate adjustment of the size of the aperture hole 1a. At the same time, the variable aperture 1 of the present embodiment has no lateral posture difference when adjusting the size of the aperture hole 1a, so that the distance between the magnet 104 and the position sensor 46 can be kept constant when in different positions, thereby ensuring the position sensing accuracy of the position sensor 46, which is conducive to achieving accurate adjustment of the size of the aperture hole 1a. In addition, the resonator 41 and the rotating bracket 30 are stacked along the thickness direction of the variable aperture 1 , which is beneficial to reducing the radial size of the variable aperture 1 , thereby realizing a miniaturized setting of the variable aperture 1 .

Secondly, the variable aperture 1 of this embodiment supports the rotating bracket 30 through the resonator 41 and the support member 44, so that it is possible to avoid using a larger resonator 41 (such as a ring-shaped resonator 41, etc.) to support the rotating bracket 30, which is beneficial to saving the internal space of the variable aperture 1, thereby improving the internal space utilization rate. At the same time, it is beneficial to reduce the size of the resonator 41 and reduce the manufacturing cost of the resonator 41.

In addition, the variable aperture 1 of the present embodiment is provided with a first friction plate 102 on the side of the rotating bracket 30 close to the resonator 41, so that the first driving foot 412 and the second driving foot 413 of the resonator 41 can abut against the first friction plate 102, thereby increasing the friction between the resonator 41 and the rotating bracket 30, avoiding the resonator 41 from slipping when driving the rotating bracket 30 to rotate, which is beneficial to improving the adjustment accuracy of the aperture hole 1a.

In addition, the first driving foot 412 and the second driving foot 413 of the resonator 41 of the present embodiment are respectively located at the two ends of the main body 411 (i.e., the first end 4111 and the second end 4112), so that the displacement of the first driving foot 412 and the second driving foot 413 during elliptical motion is more obvious, thereby realizing rapid switching of the size of the aperture hole 1a within a large range, which is beneficial to improving the response speed of the variable aperture 1.

The above specifically introduces a structure of a variable aperture 1 in conjunction with the relevant drawings. Other implementations of the variable aperture 1 will be specifically introduced below in conjunction with the relevant drawings.

Fig. 40 is a cross-sectional view of the variable aperture 1 shown in Fig. 4 on line B-B in another embodiment. Fig. 41 is an exploded schematic view of the driving mechanism 40 of the variable aperture 1 shown in Fig. 40 .

In the second embodiment, the same technical contents as those in the first embodiment are not described in detail: as shown in FIGS. 40 and 41 , the support member 44 may include a second piezoelectric ceramic 441 and a second elastic body 442. The second elastic body 442 may be fixed on the second piezoelectric ceramic 441. In addition, the circuit board 45 may further include a third sub-board 453. The third sub-board 453 may be connected to a side of the second sub-board 452 away from the first sub-board 451.

FIG. 42 is a schematic diagram of a partial structure of the driving mechanism 40 shown in FIG. 41 .

As shown in Figures 41 and 42, the second piezoelectric ceramic 441 can be fixed to the end of the third sub-plate 453 away from the second sub-plate 452. Among them, the second piezoelectric ceramic 441 can be fixed to the third sub-plate 453 by low-temperature welding or bonding. At this time, the second piezoelectric ceramic 441 can be electrically connected to the circuit board 45. The circuit board 45 can apply a PWM signal to the second piezoelectric ceramic 441 so that the second piezoelectric ceramic 441 can be deformed under the control of the signal. Exemplarily, the resonator 41 and the support member 44 can be connected in parallel through the circuit board 45.

Exemplarily, the end of the third sub-board 453 away from the second sub-board 452 can be fixed in the second fixing groove 4233 of the bracket 42. At this time, the support member 44 can be fixed to the second fixing groove 4233 through the circuit board 45.

As shown in Figures 40 and 42, the support member 44 may include a third vibration part 443 and a fourth vibration part 444. The third vibration part 443 may be connected to the fourth vibration part 444. The support member 44 may also include a third driving foot 445 and a fourth driving foot 446. The third driving foot 445 may be located at an end of the third vibration part 443 away from the fourth vibration part 444. The fourth driving foot 446 may be located at an end of the fourth vibration part 444 away from the third vibration part 443. At this time, the third driving foot 445 and the fourth driving foot 446 may be located at both ends of the support member 44, respectively.

When the bracket 42 is acted upon by the spring 43, the bracket 42 moves in a direction close to the rotating bracket 30 until the first driving foot 412 and the second driving foot 413 of the resonator 41 respectively abut against the first friction plate 102, and the third driving foot 445 and the fourth driving foot 446 of the support member 44 respectively abut against the second friction plate 103. At this time, the resonator 41 can be stacked with at least part of the rotating bracket 30 along the Z-axis direction. The support member 44 can be stacked with at least part of the rotating bracket 30 along the Z-axis direction.

Exemplarily, when the first vibration part 414 of the resonator 41 and the third vibration part 443 of the support member 44 are input with the first signal at the same time, and the second vibration part 415 of the resonator 41 and the fourth vibration part 444 of the support member 44 are input with the second signal at the same time, the first driving foot 412, the second driving foot 413, the third driving foot 445 and the fourth driving foot 446 can all generate elliptical motion in the clockwise direction. Friction is generated between the resonator 41 and the first friction plate 102. Friction is generated between the support member 44 and the second friction plate 103. The resonator 41 and the support member 44 form a driving force couple, thereby driving the rotating bracket 30 to rotate along the first direction a1. It can be understood that FIG. 42 schematically shows the first vibration part 414 and the second vibration part 415 of the resonator 41, and the third vibration part 443 and the fourth vibration part 444 of the support member 44 through dotted lines.

When the third signal is input to the first vibration part 414 of the resonator 41 and the third vibration part 443 of the support member 44 at the same time, and the fourth signal is input to the second vibration part 415 of the resonator 41 and the fourth vibration part 444 of the support member 44 at the same time, the first driving foot 412, the second driving foot 413, the third driving foot 445 and the fourth driving foot 446 can all generate elliptical motion in the counterclockwise direction. Frictional force is generated between the resonator 41 and the first friction plate 102. Frictional force is generated between the support member 44 and the second friction plate 103. The resonator 41 and the support member 44 form a driving force couple, thereby driving the rotating bracket 30 to rotate along the second direction a2.

When the input signal to the resonator 41 and the support member 44 stops, that is, when the variable aperture 1 is powered off, the first driving foot 412, the second driving foot 413, the third driving foot 445 and the fourth driving foot 446 stop moving. At this time, static friction is generated between the resonator 41 and the first friction plate 102. Static friction is generated between the support member 44 and the second friction plate 103. The two parts of static friction can be used as the self-locking force of the variable aperture 1 to control the rotating bracket 30 to stop rotating, so that the size of the aperture hole 1a can be maintained unchanged.

It can be understood that the variable aperture 1 in this embodiment includes a resonator 41 and a support member 44, wherein the support member 44 may include a second piezoelectric ceramic 441. In this embodiment, by simultaneously inputting PWM signals to the resonator 41 and the support member 44, the first driving foot 412, the second driving foot 413, the third driving foot 445, and the fourth driving foot 446 are coupled to generate elliptical motion in the same direction. In this way, a driving force couple is formed between the resonator 41 and the support member 44, so that the rotating bracket 30 can be driven to rotate relative to the housing 10 more quickly, and the size of the aperture hole 1a can be quickly switched in a large range, which effectively improves the response speed of the variable aperture 1.

In addition, compared to the variable aperture 1 with only one resonator 41, the present embodiment simultaneously provides a resonator 41 and a support member 44, wherein the support member 44 includes a second piezoelectric ceramic 441, which effectively increases the driving force of the driving mechanism 40, so that the driving mechanism 40 can carry a larger and heavier rotating bracket 30, thereby increasing the adjustment range of the variable aperture 1.

In other embodiments, the resonator 41 and the support member 44 can also respectively push the rotating bracket 30 to rotate in different directions. For example, the resonator 41 can push the rotating bracket 30 to rotate in the first direction a1. The support member 44 can push the rotating bracket 30 to rotate in the second direction a2.

It can be understood that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of the present application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

It is understood that all the above drawings are exemplary illustrations of the present application and do not represent the actual size of the product. Moreover, the size ratio relationship between the components in the drawings is not intended to limit the actual product of the present application.

The above are only some embodiments and implementation methods of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (21)

1. An iris diaphragm (1), wherein the iris diaphragm (1) comprises a stator (1 b), a rotor (1 c), a plurality of blades (60), a harmonic oscillator (41) and a supporting piece (44), the rotor (1 c) is rotationally connected with the stator (1 b), a part of the blades (60) is connected with the rotor (1 c), and a plurality of blades (60) jointly enclose an iris aperture (1 a);

The harmonic oscillator (41) and the supporting piece (44) are arranged on one side of the rotor (1 c) at intervals and jointly support the rotor (1 c), the harmonic oscillator (41) is used for driving the rotor (1 c) to rotate relative to the stator (1 b), and the rotor (1 c) drives a plurality of blades (60) to rotate so as to enable the aperture of the aperture hole (1 a) to change;

The iris diaphragm (1) further comprises a support (42) and an elastic sheet (43), the support (42) is located on one side of the rotor (1 c), one part of the elastic sheet (43) is fixed on one side, facing away from the rotor (1 c), of the support (42), and the other part of the elastic sheet (43) is fixed on the stator (1 b);

The harmonic oscillator (41) and the supporting piece (44) are arranged on the support (42) at intervals, at least part of the elastic piece (43) is located on one side, away from the harmonic oscillator (41), of the support (42), and the support (42) presses the harmonic oscillator (41) and the supporting piece (44) on the rotor (1 c) under the external force of the elastic piece (43).

2. Iris diaphragm (1) according to claim 1, characterized in that the stator (1 b) comprises a housing (10), the mover (1 c) comprises a rotating support (30), the rotating support (30) being located inside the housing (10), the rotating support (30) being rotationally connected to the housing (10), a part of the blade (60) being connected to the rotating support (30);

the harmonic oscillator (41) and the supporting piece (44) are arranged on one side of the rotating support (30) at intervals and jointly support the rotating support (30), the harmonic oscillator (41) is used for driving the rotating support (30) to rotate relative to the shell (10), and the rotating support (30) drives the blades (60) to rotate so that the aperture of the aperture hole (1 a) changes.

3. Iris diaphragm (1) according to claim 2, characterized in that said rotating bracket (30) comprises a first portion (31) and a second portion (32), said second portion (32) being connected to said first portion (31), said first portion (31) being folded with respect to said second portion (32);

A portion of the blade (60) is connected to the second portion (32) of the rotating bracket (30);

in the thickness direction of the iris diaphragm (1), the first part (31) is arranged opposite to at least part of the housing (10), and the first part (31) is rotationally connected with the housing (10);

The resonators (41) are located at a distance from the support (44) on a side of the first section (31) remote from the housing (10) and jointly support the first section (31).

4. An iris diaphragm (1) according to claim 3, wherein said housing (10) comprises a third portion (10 a) and a fourth portion (10 b), said fourth portion (10 b) being connected to said third portion (10 a), said fourth portion (10 b) being arranged in a bent manner with respect to said third portion (10 a);

in the thickness direction of the iris diaphragm (1), the third part (10 a) is arranged opposite to the first part (31), and the third part (10 a) is rotationally connected with the first part (31);

-the first portion (31) and the third portion (10 a) are located between the fourth portion (10 b) and the second portion (32), the resonator (41) being located at a side of the first portion (31) remote from the third portion (10 a) spaced from the support (44);

The stator (1 b) further comprises a base (20), the fourth part (10 b) of the housing (10) is fixed on the base (20), and the harmonic oscillator (41) and the supporting piece (44) are both arranged on the base (20).

5. Iris diaphragm (1) according to claim 3 or 4, characterized in that said housing (10) is provided with a first recess (12), said first portion (31) is provided with a second recess (311), said first recess (12) being arranged opposite to said second recess (311);

The iris diaphragm (1) further comprises a ball (50), one part of the ball (50) is located in the first groove (12), and the other part of the ball (50) is located in the second groove (311).

6. The iris diaphragm (1) according to claim 5, wherein the iris diaphragm (1) further comprises a ball retainer (90), the ball retainer (90) being fixed to a surface of the housing (10) facing the first portion (31), or the ball retainer (90) being fixed to a surface of the first portion (31) facing the housing (10);

The ball retainer (90) is provided with a through hole (91), and a part of the ball (50) is disposed in the through hole (91).

7. The iris diaphragm (1) according to any of claims 1 to 4, wherein the resonator (41) comprises a first piezoelectric ceramic (4114), the first piezoelectric ceramic (4114) being pressed against the mover (1 c) under an external force;

The first piezoelectric ceramic (4114) is used for generating elliptical motion under an electric signal, so as to drive the rotor (1 c) to rotate relative to the stator (1 b).

8. The iris diaphragm (1) according to claim 7, wherein the first piezoelectric ceramic (4114) has an elongated shape.

9. Iris diaphragm (1) according to claim 7, characterized in that the end of the first piezoceramic (4114) is pressed against the mover (1 c).

10. The iris diaphragm (1) according to claim 7, wherein the resonator (41) further comprises a first elastic body (4113), the first elastic body (4113) is fixed on the first piezoelectric ceramic (4114), and the first piezoelectric ceramic (4114) is pressed on the mover (1 c) by the first elastic body (4113) under an external force.

11. The iris diaphragm (1) according to claim 7, wherein the first piezoelectric ceramic (4114) is provided on the support (42) at a distance from the support (44);

the support (42) presses the first piezoelectric ceramic (4114) against the mover (1 c) under an external force.

12. Iris diaphragm (1) according to claim 11, characterized in that the support (42) is provided with a second fixing groove (4233), the support (44) being a support ball, at least part of which is located in the second fixing groove (4233).

13. The iris diaphragm (1) according to claim 11, wherein the support (44) comprises a second piezoelectric ceramic (441), the second piezoelectric ceramic (441) being fixed on the support (42), the second piezoelectric ceramic (441) being pressed against the mover (1 c) under external force;

The second piezoelectric ceramic (441) is used for generating elliptical motion under an electric signal, so as to drive the rotor (1 c) to rotate relative to the stator (1 b).

14. The iris diaphragm (1) according to any of the claims 11 to 13, wherein at least part of the spring plate (43) is located at a side of the support (42) remote from the first piezoelectric ceramic (4114);

the support (42) presses the first piezoelectric ceramic (4114) on the mover (1 c) under the external force of the elastic sheet (43).

15. The iris diaphragm (1) according to claim 7, wherein the first piezoelectric ceramic (4114) comprises a first end portion (4114 a) and a second end portion (4114 b), the first end portion (4114 a) being for inputting a first signal and the second end portion (4114 b) being for inputting a second signal;

When the first signal and the second signal are both positive or negative, the first piezoelectric ceramic (4114) vibrates in a stretching mode along a first direction, wherein the first direction is the length direction of the first piezoelectric ceramic (4114);

When one of the first signal and the second signal is positive and the other is negative, the first piezoelectric ceramic (4114) is subjected to flexural vibration along a second direction, and the second direction is the thickness direction of the first piezoelectric ceramic (4114);

The stretching vibration and the bending vibration form the elliptical motion.

16. Iris diaphragm (1) according to claim 15, characterized in that the period of the first signal and the second signal is T;

At 0 to T/4, the first signal is positive and the second signal is positive;

at T/4 to T/2, the first signal is positive and the second signal is negative;

at T/2 to 3T/4, the first signal is negative and the second signal is positive;

At 3T/4 to T, the first signal is negative and the second signal is negative.

17. The iris diaphragm (1) according to claim 15 or 16, wherein the first end portion (4114 a) of the first piezoelectric ceramic (4114) includes a first input end (416) and a second input end (417), the first input end (416) and the second input end (417) being arranged at intervals in a third direction, the third direction being a width direction of the first piezoelectric ceramic (4114);

the first input terminal (416) is used for inputting a first signal, the second input terminal (417) is used for inputting a second signal, and the first signal and the second signal are synthesized to form the first signal.

18. Iris diaphragm (1) according to claim 17, characterized in that the period of the first signal and the second signal is T;

at 0 to T/4, the first signal is a first value and the second signal is 0;

At T/4 to T/2, the first signal is 0 and the second signal is a second value;

At a time of T/2 to 3T/4, the first signal is 0, and the second signal is a second value;

at 3T/4 to T, the first signal is a first value and the second signal is 0.

19. Iris diaphragm (1) according to claim 10, characterized in that at least one end of the first elastomer (4113) protrudes in the direction of the mover (1 c).

20. A lens assembly (100) comprising an imaging module and the iris diaphragm (1) of any one of claims 1 to 19, the iris diaphragm (1) being located on the light entry side of the imaging module (2), the iris diaphragm (1) being adapted to adjust the luminous flux of ambient light entering the imaging module (2).

21. An electronic device (1000), characterized in that the electronic device (1000) comprises a device housing (200) and the lens assembly (100) of claim 20, the lens assembly (100) being provided inside the device housing (200).