CN118103770A

CN118103770A - Aperture control method, aperture controller, camera module and electronic equipment

Info

Publication number: CN118103770A
Application number: CN202380013856.XA
Authority: CN
Inventors: 李张成; 王怡沁; 戴佳志; 姚航; 李智信; 赵文博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-06-24
Filing date: 2023-06-13
Publication date: 2024-05-28
Also published as: CN115616831A; CN115616831B; WO2023246556A1

Abstract

The embodiment of the application provides an aperture control method, an aperture controller, a camera module and electronic equipment. The method is applied to an aperture assembly, and the aperture assembly comprises a controller, a motor and blades, wherein the controller is used for controlling the motor to drive the blades to move so as to form a light inlet hole with various apertures. The method comprises the following steps: the controller obtains a target aperture position of the aperture; when the light inlet hole of the target aperture position has the maximum aperture value or has the minimum aperture value, the controller controls the motor to drive the blade to move with constant current until the blade is fixed at the target aperture position through the limiting part; when the light inlet hole of the target aperture position is larger than the minimum aperture value and smaller than the maximum aperture value, the controller controls the motor to drive the blade to move to the target aperture position by dynamic current according to the deviation between the actual aperture position of the diaphragm and the target aperture position. The aperture position control strategy provided by the technical scheme can obtain images with better shooting quality under different shooting scenes.

Description

Aperture control method, aperture controller, camera module and electronic equipment

The present application claims priority from chinese patent office, application No. 202210726641.X, application No. 2022, 24, chinese patent application entitled "aperture control method, aperture controller, camera module, and electronic device", the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the technical field of electronic equipment, in particular to an aperture control method, an aperture controller, a camera module and electronic equipment.

Background

With the continuous development of electronic device technology, electronic devices such as mobile phones, tablet computers and wearable devices have increasingly higher requirements on shooting functions, so as to provide a camera-like shooting experience and adapt to shooting requirements of different scenes.

For this purpose, camera modules with variable aperture have been developed. Specifically, the aperture size through which light passes can be adjusted by arranging the iris diaphragm at the front end of the lens of the camera module, so that the size of the light inlet quantity is adjusted.

It is important to provide an aperture control strategy to obtain images with good shooting quality in different shooting scenes.

Disclosure of Invention

The embodiment of the application provides an aperture control method, an aperture controller, a camera module and electronic equipment, which can obtain images with better shooting quality under different shooting scenes.

In a first aspect, there is provided a diaphragm control method applied to a diaphragm assembly including a controller for controlling the motor to drive the blade to move to form a light inlet having a plurality of apertures, a motor and a blade, the method comprising:

The controller acquires a target aperture position of the aperture;

when the target aperture position of the diaphragm is a first target position, the controller controls the motor to drive the blade to move with a first constant current until the blade is fixed at the first target position through a first limiting part, wherein a light inlet hole of the first target position has the maximum aperture value in the multiple apertures;

When the target aperture position of the diaphragm is a second target position, the controller controls the motor to drive the blade to move with a second constant current until the blade is fixed at the second target position through a second limiting part, wherein a light inlet hole of the second target position has a minimum aperture value in the multiple apertures;

when the target aperture position of the diaphragm is a third target position, the controller acquires the actual aperture position of the diaphragm;

According to the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm, the controller controls the motor to drive the blade to move to the third target position with a third current, wherein the aperture of the light inlet of the third target position is smaller than the maximum aperture value and larger than the minimum aperture value.

In the embodiment of the application, when the target aperture position of the aperture is the maximum aperture position or the minimum aperture position, the aperture position is switched by adopting the combination of open loop control and mechanical limit. When the target aperture position of the diaphragm is positioned between the maximum aperture position and the minimum aperture position, closed loop control is adopted to realize the switching of the diaphragm position. The scheme can realize the accuracy, the rapidness and the stability of the aperture position control, so that the light quantity can be better controlled under different shooting scenes, and further, the image with good shooting quality can be obtained.

With reference to the first aspect, in one possible implementation manner, the magnitude of the third current dynamically changes with a deviation between a target aperture position of the diaphragm and an actual aperture position of the diaphragm.

In the closed loop control, the controller adjusts the third current in real time according to the deviation between the target aperture position and the actual aperture position, so as to stably switch the aperture position.

With reference to the first aspect, in one possible implementation manner, when the target aperture position of the diaphragm is the first target position or the second target position, the controller performs open loop control; the controller performs closed-loop control when a target aperture position of the diaphragm is the third target position.

The mode of opening and closing loop control combined with mechanical limiting can be used for switching various aperture gears, the problems of inaccurate feedback of Hall elements, insensitive partial aperture positions and the like caused by more aperture gears can be solved, and the purpose of randomly switching the aperture gears is achieved. In addition, the open loop control combines with a mechanical limiting priming strategy, so that the accuracy of the open loop control is improved.

With reference to the first aspect, in one possible implementation manner, the motor includes a magnet and a coil, one of the magnet and the coil is a stator, and the other is a mover, and the mover is used for driving the blade to move so as to change the aperture of the light inlet hole;

when the target aperture position of the diaphragm is the first target position, the first constant current is used for being input into the coil so as to provide a first magnetic force for driving the rotor to rotate around the axis of the light inlet hole; or alternatively

When the target aperture position of the diaphragm is the second target position, the second constant current is used for being input into the coil so as to provide a second magnetic force for driving the rotor to rotate around the axis of the light inlet hole;

Wherein the first magnetic force is opposite to the second magnetic force.

The direction of the rotation of the driving rotor in the first constant current input coil is opposite to the direction of the rotation of the driving rotor in the second constant current input coil, and the diaphragm can be switched to the maximum aperture position or the minimum aperture position in a certain driving current range.

With reference to the first aspect, in a possible implementation manner, the method further includes:

when the target aperture position of the diaphragm is the first target position, after the blade is fixed at the first target position, the controller controls the motor to drive the blade to remain at the first target position with a fourth constant current, wherein the fourth constant current is smaller than the first constant current and greater than 0; or alternatively

When the target aperture position of the diaphragm is the second target position, the controller controls the motor to drive the blade to remain at the second target position with a fifth constant current after the blade is fixed at the second target position, wherein the fifth constant current is smaller than the second constant current and larger than 0.

When the position of the diaphragm reaches the target aperture position, the controller can reduce the current of the driving motor, so that the diaphragm is kept at the target aperture position, and the power consumption can be reduced.

With reference to the first aspect, in a possible implementation manner, the method further includes: when the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through a locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to the preset value.

When the stress to which the diaphragm is subjected is greater than or equal to a preset value, the diaphragm is switched to the position with the largest aperture no matter what aperture position the diaphragm is in. The aperture blade is in a contracted state, and the aperture blade can be fixed through the locking mechanism, so that the aperture blade can be protected, and the possibility that the aperture blade is damaged when being subjected to large stress is reduced.

With reference to the first aspect, in a possible implementation manner, the controller controls the motor to drive the blade to move so as to form the light inlet hole with the maximum aperture value, including: the controller controls the motor to drive the blade to move with constant current so as to form the light inlet hole with the maximum aperture value; or the controller controls the motor to drive the blade to move with dynamic current according to the deviation between the actual aperture position of the diaphragm and the maximum aperture position of the diaphragm so as to form the light inlet with the maximum aperture value.

When the aperture is in a preset scene, the mode that the controller controls the motor to drive the blades to move so as to form the light inlet with the maximum aperture value can be open-loop control or closed-loop control.

With reference to the first aspect, in a possible implementation manner, the method further includes: before the motor is powered down, the controller controls the motor to drive the blades to move so as to form a light inlet hole with the maximum aperture value.

Before the motor is powered down, the aperture is switched to the position where the aperture is maximum, no matter what aperture position the aperture is in. Therefore, the aperture blades are in a contracted state, so that the blades can be protected, and the possibility of damage to the blades is reduced.

With reference to the first aspect, in a possible implementation manner, the method further includes: after the motor is powered down, when the aperture is in a preset scene, the controller controls the motor to be powered up, and controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through a locking mechanism, and the stress of the aperture in the preset scene is greater than or equal to the preset value.

After the motor is powered down, if the aperture is subjected to larger stress, the controller can control the motor to be powered up again and switch the aperture to the position with the largest aperture. In this way, the aperture blades are in a contracted state, so that the possibility of damage to the blades can be reduced.

With reference to the first aspect, in one possible implementation manner, the aperture is in a preset scene and is determined according to a gyroscope signal and/or an acceleration signal.

With reference to the first aspect, in one possible implementation manner, the preset scene includes at least one of the following scenes: the scene is flapped, the scene is flicked and the scene is dropped.

With reference to the first aspect, in one possible implementation manner, the aperture value of the first target position is less than or equal to 1.4, and the aperture value of the second target position is greater than or equal to 4.0.

In a second aspect, there is provided a diaphragm control method applied to a diaphragm assembly including a controller for controlling the motor to drive the blade to move to form an entrance aperture having a plurality of apertures, a motor and a blade, the method comprising: when the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through the locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to a preset value.

In the embodiment of the application, when the diaphragm is subjected to larger stress, the controller switches the diaphragm to the maximum aperture position no matter what aperture position the diaphragm is in, and the locking mechanism is used for fixing the blade. In this way, the aperture blades are in a contracted state, so that the possibility of damage to the blades can be reduced.

With reference to the second aspect, in one possible implementation manner, when the aperture is in a preset scene and the motor is in a power-on state, the controller controls the motor to drive the blade to move so as to form a light inlet with a maximum aperture value, and the method includes: the controller controls the motor to drive the blade to move from a current position with a first constant current until the blade forms the light inlet hole with the maximum aperture value.

With reference to the second aspect, in one possible implementation manner, when the aperture is in a preset scene and the motor is in a powered-down state, the controller controls the motor to drive the blade to move so as to form a light inlet with a maximum aperture value, including: the controller controls the motor to be electrified; the controller controls the motor to drive the blade to move from a current position with a first constant current until the blade forms the light inlet hole with the maximum aperture value.

With reference to the second aspect, in a possible implementation manner, the aperture is in a preset scene and is determined according to a gyroscope signal and/or an acceleration signal.

With reference to the second aspect, in one possible implementation manner, the preset scene includes at least one of the following scenes: the scene is flapped, the scene is flicked and the scene is dropped.

In a third aspect, there is provided an aperture controller configured to perform the method of the first aspect and any one of the possible implementations of the first aspect, or to perform the method of the second aspect and any one of the possible implementations of the second aspect.

In a fourth aspect, there is provided an aperture controller for inclusion in an electronic device, the device having the functionality to implement the actions referred to in any one of the possible implementations of the first aspect and the second aspect, or the functionality to implement the actions referred to in any one of the possible implementations of the second aspect and the second aspect, the functionality being implemented in hardware, or by execution of corresponding software in hardware. The hardware or software includes one or more modules or units or circuits corresponding to the functions described above. For example, a signal processing circuit, a control circuit, a driving circuit, and the like.

In a fifth aspect, there is provided an aperture assembly comprising a controller, a motor and a blade, the controller being for controlling the motor to drive the blade in motion to form an aperture having a plurality of apertures, wherein the controller is for performing the method of the first aspect and any one of the possible implementations of the first aspect, or for performing the method of the second aspect and any one of the possible implementations of the second aspect.

In a sixth aspect, a camera module is provided, including a lens and the aperture assembly in the fourth aspect, where the aperture assembly is disposed at a front end of the lens to form a light inlet having a plurality of apertures.

In a seventh aspect, an electronic device is provided, including the camera module in the fifth aspect and a housing for accommodating the camera module.

In an eighth aspect, there is provided an electronic device comprising: one or more processors; one or more memories; the one or more memories store one or more computer programs comprising instructions that, when executed by the one or more processors, cause the electronic device to perform the method of, or perform the method of, any of the first aspect and any of the possible implementations of the second aspect.

A ninth aspect provides a computer readable storage medium comprising computer instructions which, when run on an electronic device, cause the electronic device to perform the method of the first aspect and any one of the possible implementations of the first aspect, or to perform the method of the second aspect and any one of the possible implementations of the second aspect.

In a tenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect and any of the possible implementations of the first aspect, or to perform the method of the second aspect and any of the possible implementations of the second aspect.

In an eleventh aspect, a chip is provided, the chip comprising a processor and a data interface, the processor reading instructions stored on a memory via the data interface to perform the method as in any one of the possible implementations of the first aspect and the first aspect, or to perform the method as in any one of the possible implementations of the second aspect and the second aspect.

Optionally, as an implementation manner, the chip may further include a memory, where the memory stores instructions, and the processor is configured to execute the instructions stored on the memory, where the instructions, when executed, are configured to perform the method in any one of the foregoing first aspect and any one of the foregoing possible implementation manners of the first aspect, or perform the method in any one of the foregoing second aspect and any one of the foregoing possible implementation manners of the second aspect.

The chip may be a field programmable gate array or an application specific integrated circuit.

The advantages of the apparatus according to the third to eleventh aspects may be referred to the advantages of the methods according to the first and second aspects, and are not described here again.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a camera module provided in an embodiment of the present application.

Fig. 3-6 are schematic block diagrams of a variable aperture provided in accordance with embodiments of the present application.

Fig. 7 is a schematic view of a variable aperture stop according to an embodiment of the present application.

Fig. 8 is a schematic diagram of the aperture position detected by the hall element throughout the stroke of the motor.

Fig. 9 is a schematic flowchart of a diaphragm control method according to an embodiment of the present application.

Fig. 10 is a schematic view of an iris diaphragm in a maximum aperture position according to an embodiment of the application.

Fig. 11 is a schematic flowchart of a diaphragm control method according to an embodiment of the present application.

Fig. 12 is a schematic flow chart of open loop control and closed loop control provided by an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In addition, the term "vertical" in the present application is not strictly vertical, but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

In the description of embodiments of the present application, the terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like are used for defining an orientation or position relative to the orientation or position in which components are schematically depicted in the drawings, and it should be understood that these directional terms are relative terms used for describing and clarifying the description relative to each other, rather than for indicating or implying that the apparatus or component being referred to must have a particular orientation, or be constructed and operated in a particular orientation, which may vary accordingly with respect to the orientation in which components are depicted in the drawings and therefore should not be construed as limiting the present application.

It should be noted that, in the embodiment of the present application, the same reference numerals denote the same components or the same parts, and for the same parts in the embodiment of the present application, reference numerals may be given to only one of the parts or the parts in the drawings, and it should be understood that, for other same parts or parts, the reference numerals are equally applicable.

For convenience of understanding, technical terms involved in the embodiments of the present application are explained and described below.

The aperture is a device for controlling the light quantity of light entering the photosensitive surface of the body through the lens. The size of the aperture controls how much light is entered and also how much background is blurred (i.e., the depth of field of the picture). The larger the aperture, the more the amount of incoming light, and the brighter the screen. The smaller the aperture, the smaller the amount of light entering, and the darker the screen. The larger the aperture, the shallower the depth of field, and the more pronounced the background blurring (i.e., the more blurred the background). The smaller the aperture, the deeper the depth of field and the clearer the background.

The aperture may be divided into a fixed aperture and a variable aperture. The size of the fixed aperture is not arbitrarily changeable. The size of the iris diaphragm can be adjusted, so that the amount of light entering can be adjusted. The adjustability of the aperture may provide further photographing advantages, such as the user being free to control the size of the aperture and thus the exposure time and the degree of background blurring. The size of the aperture described herein refers to the size of the aperture through which light passes (i.e., clear aperture, clear diameter, or aperture of a through-hole).

The aperture value, which is used to indicate the size of the aperture, is generally indicated by F. The aperture value is the ratio of the focal length of the lens to the light passing diameter, and is expressed as F (aperture value) =f (lens focal length)/D (light passing diameter). The light flux is expressed as the area of the hole corresponding to the light flux diameter, and is expressed as S (light flux) =pi (D/2) ² by the formula. The aperture value (i.e., F-number) is inversely related to the aperture size, with the larger the aperture, the smaller the aperture value. A generally common sequence of F values (i.e. aperture positions) is as follows: f1.4, F2, F2.8, F4, F5.6, F8, F11, F16, F22, F32, F44, F64, wherein the former is 2 times the latter for two adjacent F values. In some embodiments, for example, an aperture value of 1.4, the usual representation is F1.4 or F/1.4.

The aperture blade, which may be referred to as a blade for short, is a set of overlapping sheet-like members in the aperture for adjusting the clear aperture. In general, the iris diaphragm includes a plurality of blades annularly arranged to form an entrance aperture through which light passes. The size of the light inlet hole can be adjusted by driving the blades to move, so that the aim of changing the light inlet amount is fulfilled.

The optical axis is the direction in which the optical system conducts light. For a symmetric transmission system, the optical axis generally coincides with the optical system rotation centerline.

Autofocus (AF) may refer to that light reflected by a subject may be imaged on an image sensor after passing through a lens using a lens imaging principle and a light reflection principle; a clear image can be formed on the image sensor by moving one or more lenses according to the object distance of the subject. Autofocus can be seen simply as a movement of the lens relative to the image sensor along the optical axis.

The optical anti-shake (optical image stabilization, OIS) may refer to that by adjusting the placement angle, placement position, etc. of the lens relative to the image sensor, the instrument shake phenomenon occurring during capturing the optical signal may be reduced, and thus the imaging quality may be improved. One possible approach is to detect the displacement or angle to be compensated by, for example, a gyroscope, and then to translate or rotate the lens or image sensor by a motor so that image blur due to imaging instrument device shake during exposure can be compensated. Optical anti-shake can be seen simply as a translation or rotation of the lens relative to the image sensor in a plane perpendicular to the optical axis.

Fig. 1 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.

The electronic device 100 according to the embodiment of the present application is an electronic device having an imaging function (for example, image capturing or photographing), such as a mobile phone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, a video camera, a video recorder, a camera, a smart watch (SMART WATCH), a smart band (smart wristband), a car-mounted computer, a television (or a smart screen), and the like.

The embodiment of the present application is not particularly limited to the specific form of the electronic device 100. For convenience of explanation and understanding, the following description will be made taking the electronic device 100 as an example of a mobile phone. By way of example, (a) and (b) in fig. 1 schematically show the front and back, respectively, of the electronic device 100.

As shown in fig. 1, an electronic device 100 may include a housing 101, a display screen (DISPLAY PANEL, DP) 102, and a camera module (camera compact module, CCM) 103.

The case 101 is formed with an accommodating space for accommodating components of the electronic apparatus 100. The housing 101 may also function to protect the electronic device 100 and support the entire machine. The display screen 102 and the camera module 103 are disposed in the accommodating space of the housing 101, and are connected to the housing 101. In some embodiments, the housing 101 may include a rear cover disposed opposite the display screen 102 and a middle frame disposed inside the electronic device 100, and the display screen 102 and the camera module 103 may be fixed to the middle frame. The material of the housing 101 may be metal, plastic, ceramic or glass.

The display screen 102 is used to display images, such as images captured by the camera module 103. The display screen 102 may be a Liquid CRYSTAL DISPLAY (LCD) screen, an Organic LIGHT EMITTING Diode (OLED) screen, etc., wherein the OLED screen may be a flexible display screen or a hard display screen. The display screen 102 may be a regular screen, a special-shaped screen, a folding screen, or the like. The display screen 102 may be disposed on the front and/or back of the electronic device 100. Here, the front side of the electronic device 100 may be understood as a side facing the user when the user uses the electronic device 100, and the back side of the electronic device 100 may be understood as a side facing away from the user when the user uses the electronic device 100.

The camera module 103 is used to capture still images or video. The camera module 103 may be disposed on the front and/or back of the electronic device 100. When the camera module 103 is disposed on the front side of the electronic device 100, it may be used to capture a scene on the front side of the electronic device 100, for example, for self-timer shooting, which may be referred to as a front camera in some embodiments. When the camera module 103 is disposed on the back of the electronic device 100, it may be used to capture a scene on the back side of the electronic device 100, which may be referred to as a rear camera in some embodiments. When shooting, a user can select a corresponding camera module according to shooting requirements.

The camera module 103 may be a vertical module or a folding module. The vertical camera module can be understood that the light entering the camera module is directly transmitted to the image sensor, and the light path is not bent. The folding camera module can be understood that light entering the camera module can be transmitted to the image sensor only through the reflector, the lens, the prism and other elements, and the light path is folded. The folded camera module may also be referred to as a periscope camera module.

In some embodiments, the camera module 103 may be a tele camera module or a wide camera module.

In some embodiments, the camera module 103 may be a fixed focus module or a zoom module, where the zoom module may include a manual zoom module and an automatic zoom module.

It will be appreciated that the mounting position of the camera module 103 in fig. 1 is merely illustrative. When the camera module 103 is used as a front camera, it may be mounted on the front surface of the electronic device 100 at any position other than the display screen 102, for example, the left side of the earphone, the middle of the upper portion of the electronic device 100, the lower portion (or chin) of the electronic device 100, or four corners of the electronic device 100. The camera module 103 may also be disposed in a hollowed-out area on the display screen 102. When the camera module 103 is used as a rear camera, it may be mounted on any position on the back of the electronic device 100, for example, the upper left corner, the upper right corner, or the upper middle position. In other embodiments, the camera module 103 may be disposed not on the main body of the electronic device 100, but on an edge protruding from the main body of the electronic device 100, or on a component movable or rotatable relative to the electronic device 100, where the component may be telescopic or rotatable from the main body of the electronic device 100, so that the camera module 103 may be hidden inside the electronic device 100 or at least partially ejected from the electronic device 100, etc. When the camera module 103 can rotate relative to the electronic device 100, the camera module 103 is equivalent to a front camera and a rear camera, that is, by rotating the same camera module 103, a scene on the front side of the electronic device 100 can be shot, and a scene on the back side of the electronic device 100 can be shot. In other embodiments, when the display screen 101 is foldable, the camera module 103 may function as a front camera or as a rear camera as the display screen 102 is folded.

The number of the camera modules 103 is not limited in the embodiment of the present application, and may be one, two, four or more, for example, one or more camera modules 103 may be disposed on the front side of the electronic device 100, and/or one or more camera modules 103 may be disposed on the back side of the electronic device 100. When a plurality of camera modules 103 are provided, the plurality of camera modules 103 may be identical or different, for example, the lens optical parameters of the plurality of camera modules 103 may be different, the lens arrangement positions may be different, the lens shapes may be different, and the like. The embodiment of the application also does not limit the relative positions of the camera modules when the camera modules are arranged.

Optionally, in some embodiments, the electronic device 100 may further comprise a protective lens 104 for protecting the camera module 103. The protective lens 104 is disposed on the housing 101 and covers the camera module 103. When the protective lens 104 is used to protect the front camera, the protective lens 104 may cover only the front camera module or the entire front surface of the electronic device 100. When the protective lens 104 covers the entire front surface of the electronic device 100, the protective lens 104 may be used to protect the front camera module and the display screen 102 at the same time, and the protective lens 104 is Cover Glass (CG). When the protection lens 104 is used for protecting the rear camera, the protection lens 104 may cover the entire back surface of the electronic device 100, or may be only disposed at a position corresponding to the rear camera module. The material of the protective lens 104 may be glass, sapphire, ceramic, etc., and the embodiment of the present application is not limited in particular. In some embodiments, the protective lens 104 is transparent, and light outside the electronic device 100 can enter the camera module 103 through the protective lens 104.

It should be understood that the structure illustrated in fig. 1 is not limited to the specific structure of the electronic device 100, and the electronic device 100 may include more or less components than those illustrated, for example, the electronic device 100 may further include one or more of a battery, a flash, a fingerprint recognition module, a receiver, a key, a sensor, and the like, and the electronic device 100 may also be provided with a different arrangement of components than those illustrated.

With the continuous development of electronic device technology, electronic devices such as mobile phones, tablet computers and wearable devices have increasingly higher requirements on shooting functions, so as to provide a camera-like shooting experience and adapt to shooting requirements of different scenes. For example, in a dark environment, it is necessary to take a brighter, clearer picture; or photographing in places with beautiful environment, and taking the front and back sceneries while photographing people clearly; still further, or when capturing a person image, it is necessary to lighten the background and highlight the subject, and so on.

For this purpose, camera modules with variable aperture have been developed. Specifically, by arranging the iris diaphragm at the front end of the lens of the camera module, the aperture size through which light passes can be adjusted, so that the size of the light incoming quantity is adjusted and the depth of field of a picture is controlled. For example, the size of the iris diaphragm can be adjusted to adapt to different illumination conditions and focusing distances, so that a user is helped to better adjust the light incoming amount and background blurring to adapt to different scene requirements.

For easy understanding, fig. 2 shows a schematic block diagram of a camera module provided in an embodiment of the present application. The camera module 200 in fig. 2 may be one exemplary structure of the camera module 103 in fig. 1.

For convenience of description, the optical axis direction of the camera module 200 is defined as the Z direction, the subject direction side in the optical axis direction is the front side, and the direction side opposite to the subject is the rear side. The first direction perpendicular to the optical axis is the X direction, and the second direction perpendicular to the optical axis and the first direction is the Y direction.

Here, the X, Y, Z directions and the definitions of front and rear are equally applicable to the respective drawings to be described later. It should be noted that, the above definitions of the direction X, Y, Z and the front and back are only for convenience in describing the positional relationship, the connection relationship and the movement relationship between the components in the embodiments of the present application, and should not be construed as limiting the embodiments of the present application.

As shown in fig. 2, the camera module 200 may include an aperture assembly 210, a lens 220, a driving assembly 230, and an image sensor assembly 240.

The lens 220 is used to image a subject on the object side onto an imaging plane on the image side. The lens 220 may include a barrel and one or more lenses disposed in the barrel.

In some embodiments, lens 220 may be a fixed focus lens or a zoom lens.

In some embodiments, lens 220 may be a wide angle lens, a standard lens, or a tele lens.

In some embodiments, lens 220 may be a standing lens or a periscope lens.

The driving component 230 is used for driving the lens 220 to move so as to realize automatic focusing and/or optical anti-shake. For example, the driving assembly 230 may include a motor for moving the lens 220 for auto-focusing (hereinafter, may be abbreviated as an AF motor) and a motor for moving the lens 220 for optical anti-shake (hereinafter, may be abbreviated as an OIS motor). Specifically, the AF motor is used to move the lens 220 for auto-focusing in the Z direction (i.e., the optical axis direction), and the OIS motor is used to move the lens 220 for optical anti-shake in the X direction or the Y direction (i.e., the direction perpendicular to the optical axis). The AF motor and OIS motor may be two separate components that independently drive the lens 220 for AF and OIS, respectively. The AF motor and OIS motor may be the same component, and the one component may drive the lens 220 to perform AF or drive the lens 220 to perform OIS.

In some embodiments, the AF motor and/or OIS motor may be a Voice Coil Motor (VCM), a shape memory alloy (shape memory alloy, SMA) motor, a stepper motor (stepping motor), a piezoelectric motor (piezoelectric motor), or the like. It should be understood that the specific structures of the AF motor and OIS motor may be designed and selected accordingly according to the selected driving mode, and embodiments of the present application will not be described in detail.

The image sensor assembly 240 is disposed at the rear side of the lens 220, mainly for imaging. Specifically, light reflected by the subject passes through the lens 220 and is projected onto the photosensitive surface of the image sensor assembly 240. To obtain a clear image, lens 220 may be driven into position by drive assembly 230 using lens imaging principles. Thus, light may be focused on the photosurface of image sensor assembly 240, forming a clear optical image. The image sensor assembly 240 may convert the optical image into an electrical signal, thereby obtaining an image signal. In some embodiments, image sensor assembly 240 may include an image sensor as well as other external devices and support structures.

The diaphragm assembly 210 is disposed at a front side of the lens 220 for adjusting the amount of light entering to achieve an improvement in image quality. Specifically, the aperture assembly 210 is used to control the amount of light that passes through the lens 220 into the photosensitive surface of the image sensor assembly 240. In an embodiment of the present application, the aperture assembly 210 is an iris diaphragm structure. In some embodiments, the aperture assembly 210 includes a plurality of blades, and the plurality of blades are annularly arranged to form an entrance hole for light passing therethrough, and the size of the entrance hole can be adjusted by driving the plurality of blades to move, so as to achieve the purpose of changing the amount of light entering. Light outside the camera module 200 enters the lens 220 through the light inlet of the aperture assembly 210, and the light passing through the lens 220 finally reaches the image sensor assembly to develop and image. On the other hand, the aperture assembly 210 may also function to control the depth of field, and in general, the aperture is large and the depth of field is small; the aperture is small and the depth of field is large.

By providing the aperture assembly 210, the camera module 200 can adapt to shooting requirements of different scenes. For example, the size of the iris diaphragm can be adjusted to adapt to different illumination conditions and focusing distances, so that the requirements of image brightness are met, different depth of field is provided, and a user can be helped to better adjust the light incoming quantity and background blurring, so that the imaging effect is improved. For example, under indoor lighting, a plurality of stripes may appear in the photographed image, and the photographed image is clearer after the amount of light is adjusted by the aperture assembly 210. In addition, in the macro photographing, if the depth of field is shallow, background blurring cannot be performed, and it is difficult to highlight the photographed object, and after the amount of light input is adjusted by the aperture assembly 210, the depth of field can be increased, and background blurring is performed to highlight the subject.

For ease of understanding, fig. 3 to 6 show schematic block diagrams of an iris diaphragm provided by an embodiment of the present application. Wherein fig. 3 is a schematic assembly view of the iris diaphragm and fig. 4 to 6 are schematic exploded views of the iris diaphragm shown in fig. 3. The variable aperture 300 shown in fig. 3 to 6 may be one exemplary structure of the aperture assembly 210 in fig. 2.

Referring to fig. 3 to 6, the variable aperture 300 may include an upper cover 310, a blade 320, an aperture motor, and a flexible circuit board 350. In the embodiment of the present application, the number of the blades 320 is plural, and the plural blades 320 are annularly arranged to form the light inlet hole for the light to pass through. The centerline of the light entry aperture is parallel to the direction of the optical axis, and in some embodiments, the centerline of the light entry aperture is collinear with the centerline of the lens 220, i.e., the centerline of the light entry aperture is collinear with the optical axis. The diaphragm motor may drive the plurality of blades 320 to rotate to adjust the aperture of the light entrance hole, thereby adjusting the amount of light entrance. The upper cover 310 is disposed on a side of the blade 320 away from the lens, and is used for protecting the blade 320. The upper cover 310 is provided with a through hole consistent with the maximum aperture of the light entrance hole formed by the plurality of blades 320. When the plurality of blades 320 form a light inlet hole of a maximum aperture under the driving of the diaphragm motor, the plurality of blades 320 may be hidden under the upper cover 310. When the plurality of blades 320 form a light inlet hole smaller than the maximum aperture by the driving of the diaphragm motor, the plurality of blades 320 are exposed from the through hole of the upper cover 310. The flexible circuit board 350 is used for transmitting an electric signal for controlling the diaphragm motor.

Fig. 4 shows an exploded view of the upper cover 310 separated from the iris 300, and the plurality of blades 320 form an entrance aperture having a smaller or equal diameter than the aperture of the through hole provided in the upper cover 310. Note that, the light entrance holes formed by the plurality of blades 320 are circular or polygonal (e.g., regular polygon). When the light inlet is circular, the aperture of the light inlet can be understood as the diameter of the circular light inlet. When the light inlet is polygonal, the aperture of the light inlet can be understood as the diameter of the inscribed circle of the polygonal light inlet. For example, the blades 320 may be sickle-shaped.

Fig. 5 shows an exploded view of the upper cover 310 and the blades 320 separated from the iris diaphragm 300. Referring to fig. 5, in some embodiments, the aperture motor may include a fixed assembly 330 and a rotating assembly 340, wherein the fixed assembly 330 is sleeved on the rotating assembly 340, and wherein the rotating assembly 340 may rotate relative to the fixed assembly 330 about a center line of the light entrance aperture. The blades 320 are rotatably connected with the fixing component 330 and slidably connected with the rotating component 340, when the rotating component 340 rotates around the center line of the light inlet, the blades 320 can be driven to rotate relative to the fixing component 330, and the size of the light inlet formed by surrounding the blades 320 is changed.

Referring to fig. 6, in some embodiments, the fixed assembly 330 may include a fixed carrier 331, a coil 332, and a base 333. The fixed carrier 331 and the base 333 are covered together to form an accommodating space for accommodating the rotating assembly 340. The fixed carrier 331 and the base 333 are hollow structures, and the fixed carrier 331 and the base 333 are ring structures, for example. In some embodiments, the coil 332 is fixedly connected to the fixed carrier 331 and/or the base 333. In other embodiments, the coil 332 may be fixedly connected to the flexible circuit board 350. In an embodiment of the present application, the coil 332 is electrically connected to the flexible circuit board 350.

In some embodiments, the rotating assembly 340 may include a rotating carrier 341 and a magnet 342. The magnet 342 is fixedly connected to the rotating carrier 341. The rotating carrier 341 has a hollow structure, and illustratively, the rotating carrier 341 has a ring-like structure. In the assembled state, the fixed carrier 331 is sleeved on the rotating carrier 341, and the coil 332 and the magnet 342 are disposed opposite to each other in a direction perpendicular to the optical axis.

In some embodiments, air is between the coil 332 and the magnet 342. For example, the coil 332 may be disposed on a face of the fixed carrier 331 facing the rotating carrier 341, and the magnet 342 may be disposed on a face of the rotating carrier 341 facing the fixed carrier 331. For another example, the side wall of the fixed carrier 331 may be provided with a groove penetrating the thickness of the side wall thereof, and the coil 332 is fixed at a position corresponding to the groove. The side wall of the rotating carrier 341 may be provided with a groove penetrating the thickness of the side wall thereof, and the magnet 342 is fixed at a position corresponding to the groove. At least part of the gap between the coil 332 and the magnet 342 does not include the side wall of the fixed carrier 331 nor the side wall of the rotating carrier 341, the size of the iris diaphragm in the direction perpendicular to the optical axis can be reduced, and the weight can be reduced. For another example, the coil 332 may be disposed on the flexible circuit board 350, and the fixed carrier 331 is removed from the sidewall at a position corresponding to the coil 332, such that the coil 332 is disposed opposite to the magnet 342.

In an embodiment of the present application, the number of coils 332 is one or more, and the number of magnets 342 is one or more. One coil 332 and one magnet 342 may be provided as a set of coil-magnets, and one or more sets of coil-magnets may be provided in embodiments of the present application. When a plurality of sets of coil-magnets are provided, the plurality of sets of coil-magnets are uniformly distributed in the circumferential direction perpendicular to the optical axis.

In some embodiments, the positions of the coil 332 and the magnet 342 may be reversed, that is, the rotating assembly 340 includes the coil 332, and the fixing assembly 330 includes the magnet 342, which may also achieve the purpose of moving the blade 320 by the rotating assembly 340. That is, in the embodiment of the present application, the aperture motor may include a stator and a mover, wherein the stator may be one of a magnet or a coil, and the mover may be the other of the magnet or the coil.

In some embodiments, the stationary carrier 331 may include a first annular body 3311 and a positioning post 3312 protruding from the first annular body 3311 toward the blade 320. The number of the positioning posts 3312 is plural, the positioning posts 3312 are distributed annularly around the optical axis, and the positioning posts 3312 are in one-to-one correspondence with the blades 320. Each vane 320 is rotatably coupled to the fixed carrier 331 by a positioning post 3312. That is, the vane 320 may rotate about the corresponding positioning post 3312.

In some embodiments, the rotating carrier 341 may include a second annular body 3411 and a guide post 3412 protruding from the second annular body 3411 toward the blade 320 facing the blade 320. The number of the guide posts 3412 is plural, the plurality of guide posts 3412 are annularly distributed around the optical axis, and the plurality of guide posts 3412 are in one-to-one correspondence with the plurality of blades. Each vane 320 is slidably coupled to the rotating carrier 341 by a guide post 3412. In the embodiment of the present application, the blade 320 is driven to rotate around the positioning post 3312 by sliding with the rotating carrier 341.

Accordingly, in some embodiments, the blade 320 may include a blade body 321, a positioning hole 322 and a guide groove 323 formed on the blade body 321, the positioning hole 322 is sleeved on the positioning post 3312, and the guide groove 323 is sleeved on the guide post 3412. The blade 320 is driven to rotate around the corresponding positioning post 3312 by the cooperation of the positioning post 3312 and the positioning hole 322 and the sliding of the guiding post 3412 in the guiding slot 323.

In the embodiment of the application, the blade 320 can be driven to rotate around the corresponding positioning post 3312 by the interaction force between the coil 332 and the magnet 342 after being electrified, so that the aperture size of the light inlet hole is adjusted, and the light inlet quantity is adjusted. More specifically, in the assembled state, the coil 332 and the magnet 342 are disposed opposite to each other in a direction perpendicular to the optical axis, and when the coil 332 is energized, a lorentz force is generated between the coil 332 and the magnet 342, which is tangential to the radial direction of the rotating assembly 340, i.e., the lorentz force is a tangential force. Since the coils 332 are relatively fixed, the tangential force will drive the magnet 342 to rotate about the optical axis. The magnet 342 is fixed to the rotation carrier 341, and accordingly, the tangential force drives the entire rotation assembly 340 to rotate about the optical axis direction as a driving force. Since the guide posts 3412 are positioned in the guide grooves 323, the guide posts 3412 slide in the guide grooves 232 when the turn carrier 341 rotates. One end of the vane 320 is engaged with the positioning post 3312 through the positioning hole 322, and the end is rotatable with respect to the fixing member 330. When the guide post 3412 slides along the guide groove 323, the vane 320 is rotated about the positioning post 3312. The plurality of blades 320 are simultaneously rotated about the respective positioning posts 3312 to effect the opening and closing of the plurality of blades 320. Correspondingly, the aperture size of the light inlet hole formed by the plurality of blades 320 is changed.

In some embodiments, the upper cover 310 may include an upper cover body 311 and a first through hole 312 and a first groove 313 opened on the upper cover body 311, each of the first through hole 312 and the first groove 313 penetrating through a thickness of the upper cover body 311 in the optical axis direction. The first through hole 312 is used for the passing of the positioning post 3312, and the first groove 313 is used for the passing of the guiding post 3412. Since the guide post 3412 is movable, the shape of the first groove 313 is adapted to the movement trace of the guide post 3412. Illustratively, the guide post 3412 rotates around the optical axis direction, and the movement track thereof is arc-shaped, and accordingly, the first groove 313 may be an arc-shaped groove, but the present application is not limited thereto. In other embodiments, the first slot 313 may have other shapes as long as the first slot 131 does not interfere with the movement of the guide post 3412. Here, the number of the first through holes 312 is plural, and the plural first through holes 312 are in one-to-one correspondence with the plural positioning posts 3312. The number of the first grooves 313 is plural, and the plurality of first grooves 313 corresponds to the plurality of guide posts 3412 one by one. The plurality of first through holes 312 are annularly distributed around the optical axis direction. The plurality of first grooves 313 are annularly distributed around the optical axis direction.

In the embodiment of the present application, the upper cover 310 is coupled to the fixing member 330, so that the upper cover 310 is fixed with respect to the vane 320. The upper cover 310 may protect the blade 320, prevent the blade 320 from coming out of the positioning posts 3312 and/or the guide posts 3412, and improve reliability.

In some embodiments, the flexible circuit board 350 surrounds the outer surface of the fixed assembly 330. The flexible wiring board 350 is used to transmit a driving current to the coil 332.

In some embodiments, iris diaphragm 300 may further include a spacer 360, where spacer 360 is disposed between blade 320 and rotating carrier 341, and may function to protect blade 320. The spacer 360 can prevent the blade 320 from contacting the rotating carrier 341 in a large area, and can reduce friction force of the blade 320 during movement, thereby prolonging the service life of the blade 320. On the other hand, the spacer 360 is annular and can serve as an aperture for a certain gear.

In some embodiments, the iris diaphragm 300 may further include a ball 370, the ball 370 being disposed between the fixed carrier 331 and the rotating carrier 341. Illustratively, a side of the first annular body 3311 of the fixed carrier 331 facing the rotary carrier 341 is provided with a first accommodation groove 3313, the first accommodation groove 3313 extending in a circumferential direction perpendicular to the optical axis. The second annular body 3411 of the rotating carrier 341 is provided with a second accommodation groove 3413 on a side facing the fixed carrier 331, the second accommodation groove 3413 extending in a circumferential direction perpendicular to the optical axis. The balls 370 are partially accommodated in the first accommodation groove 3313 and partially accommodated in the second accommodation groove 3413. When the rotating carrier 341 rotates relative to the fixed carrier 331, the balls 370 roll in the space formed by the first accommodation groove 3313 and the second accommodation groove 3413, so that friction force during rotation of the rotating carrier 341 can be reduced, and smoothness of rotation of the rotating carrier 341 can be improved.

In some embodiments, the extension length of the first receiving groove 3313 and/or the second receiving groove 3413 is greater than or equal to the rotational travel of the rotational carrier 341.

In some embodiments, the first receiving groove 3313 extends in the optical axis direction to an end of the fixed carrier 331 remote from the blade 320. This facilitates the installation of the ball 370.

In some embodiments, the first receiving groove 3313 extends through a wall thickness of the first annular body 3311 of the stationary carrier.

In some embodiments, the first and second receiving grooves 3313 and 3413 are filled with a lubricant to reduce friction with the fixed carrier 331 and the rotating carrier 341 during the movement of the balls.

In the embodiment of the present application, the number of balls 370 is one or more. When the iris diaphragm 300 includes the plurality of balls 370, the corresponding first and second receiving grooves 3313 and 3413 are each plural in number and correspond to the number of balls 370. Of course, the plurality of balls 370 may be accommodated in the first and second accommodation grooves 3313 and 3413, which is not limited in the embodiment of the application.

In some embodiments, iris diaphragm 300 may also include a magnetic sheet 380. The magnetic conductive sheet 380 is disposed at an end of the fixing component 330 away from the blade 320, for example, the magnetic conductive sheet 380 is disposed at the bottom of the base 333. The magnetic conductive sheet 380 can generate an interaction force with the magnet 342, the force can attract the rotating assembly 340, so that the ball 370 can be tightly pressed with the first accommodation groove 3313 and the second accommodation groove 3413 in any state, the rotating assembly 340 can rotate stably, and the movement of the rotating assembly 340 along the optical axis direction during the rotation process can be reduced or avoided to influence the accuracy of the aperture gear control.

In some embodiments, iris diaphragm 300 may also include a driver chip 390, which driver chip 390 is used to control the amount of current supplied to coil 322, i.e., to control the drive current of the diaphragm motor, and thus the gear position of the diaphragm. The drive currents are different in magnitude and the speed at which the diaphragm motor drives the blades 320 is different. In general, the greater the drive current, the faster the speed at which the blade 320 moves; the lower the drive current, the slower the speed at which the blade 320 moves. In embodiments of the present application, driver chip 390 may be mounted on flexible circuit board 350 and electrically connected to flexible circuit board 350.

In some embodiments, driver chip 390 may be surrounded by coil 332, and driver chip 390 may sense a change in the magnetic field of magnet 342 during rotation of rotation assembly 340, thereby enabling the position of the aperture to be determined. In some embodiments, driver chip 390 includes a hall element, so driver chip 390 can detect the position of the aperture through the hall element. The position of the diaphragm referred to herein is understood to be the position of the aperture of the light entrance hole, and is also understood to be the size of the opening and closing of the blade 320.

By way of example and not limitation, fig. 7 shows a schematic view of the structure with the iris in different positions. Fig. 7 (a), (b), (c), and (d) show the iris in the first, second, third, and fourth aperture positions, respectively, wherein the first aperture position < the second aperture position < the third aperture position < the fourth aperture position, and the first aperture position > the second aperture position > the third aperture position > the fourth aperture position, when ordered by aperture value. Illustratively, the first aperture position corresponds to the smallest aperture size, and the fourth aperture position corresponds to the largest aperture size.

In some embodiments, the first aperture position, the second aperture position, the third aperture position, and the fourth aperture position may each be one aperture stop. By way of example and not limitation, the aperture value of the first aperture position may be F4.0, the aperture value of the second aperture position may be F2.8, the aperture value of the third aperture position may be F2.0, and the aperture value of the fourth aperture position may be F1.4. It should be understood that the above aperture values corresponding to the respective aperture positions are merely exemplary, and embodiments of the present application are not limited thereto, and in other embodiments, the variable aperture 300 may have more or less gears, and the aperture value corresponding to each gear may be selected and designed according to actual requirements, which will not be described in detail herein.

It will be appreciated that the iris diaphragm 300 described in fig. 3-6 is merely an exemplary configuration, and that in other embodiments, other forms of iris diaphragms may be employed and will not be described in detail herein.

The light inlet holes of different aperture positions have different sizes, so the light inlet amount is different. The control of the amount of light intake has an important influence on the imaging quality. In the currently provided aperture stop control scheme, closed-loop control is adopted. Specifically, the driving chip acquires a target position of the diaphragm and an actual position of the diaphragm, and controls a current for driving the blade to move by the diaphragm motor through a deviation between the actual position of the diaphragm and the target position. The actual position of the aperture is detected by a hall element, e.g. a hall sensor. Taking the iris diaphragm 300 shown in fig. 3 to 6 as an example, the hall element is fixed with respect to the mover in the diaphragm motor, for example, the hall element is fixed to the fixed carrier 331. Taking the mover as a magnet and the stator as a coil as an example, the hall element detects the actual position of the diaphragm by sensing the change of the magnetic field when the mover rotates around the optical axis direction relative to the stator. When the mover rotates around the optical axis direction relative to the stator, the mover is influenced by the gesture of the iris diaphragm and external acting force, and therefore the relative position between the Hall element and the magnet is influenced, and the magnetic field of the magnet is nonlinear, so that when the diaphragm is at an end aperture position (such as a maximum aperture position and a minimum aperture position), an error between the diaphragm position detected by the Hall element and the real position of the diaphragm is large, namely the diaphragm position detected by the Hall element is low in accuracy. Based on this, when the diaphragm is switched to the end aperture position by closed-loop control, the control accuracy is low. That is, the diaphragm is not actually at the end aperture position, so that the amount of light input is greatly deviated from the required amount of light input, thereby affecting the imaging quality.

Fig. 8 shows a schematic diagram of the aperture position detected by the hall element over the entire stroke of the motor. As shown in fig. 8, the abscissa in the drawing is the motor stroke, and the ordinate is the hall element detection value, wherein the values of the abscissa and the ordinate are merely exemplary. In the figure, the aperture gear includes a Q1 gear, a Q2 gear, a Q3 gear and a Q4 gear as examples, wherein the light inlet of the Q1 gear is greater than the light inlet of the Q2 gear, greater than the light inlet of the Q3 gear, and greater than the light inlet of the Q4 gear. Curves L1, L2, L3, L4, and L5 are exemplarily shown, and the hall element differs from the magnet in the gap along the optical axis between the different curves. As can be seen from fig. 8, the curves L1, L2, L3, L4, and L5 are good in the repetition coincidence of the Q2 shift position and the Q3 shift position, which means that the gap between the hall element and the magnet in the direction along the optical axis has less influence on the hall element detection of the Q2 shift position diaphragm and the Q3 shift position diaphragm. As can be seen from fig. 8, the curves L1, L2, L3, L4, and L5 are inferior in the repetition coincidence of the Q1 shift position and the Q4 shift position, which means that the influence of the gap between the hall element and the magnet in the direction along the optical axis on the hall element detection end-position diaphragm is large when the motor is at both ends of the stroke. As shown in the figure, when the motor stroke is the maximum stroke in the forward direction or the maximum stroke in the reverse direction, the gap between the hall element and the magnet in the optical axis direction is different, and the gap between the diaphragm positions detected by the hall element is large. Or when the gap between the hall element and the magnet in the optical axis direction is different, the deviation amount of the motor stroke is large when the driving diaphragm reaches the target position although the diaphragm position detected by the hall element is the same. Thus, when the attitudes of the iris are different, the relative positions of the hall element and the magnet in the optical axis direction are affected, so that the accuracy of detection of the hall element is affected, and the control accuracy of the aperture gear is further affected. On the basis, when closed-loop control is carried out on the end aperture position of the diaphragm, the driving chip can adjust driving current in real time according to deviation between the diaphragm position detected by the Hall element and the target position, and a user using the iris diaphragm can sense the movement of the diaphragm motor to influence the use experience of the user.

Therefore, it is necessary to provide an aperture control strategy to accurately, stably and rapidly control the aperture position in different shooting scenes, so as to obtain an image with better shooting quality.

Fig. 9 shows a schematic flowchart of a diaphragm control method according to an embodiment of the present application.

The method 400 shown in fig. 9 is applied to an aperture assembly that may include a controller, a motor, and a blade, wherein the controller is configured to control the motor to drive the blade to move to form an entrance aperture having a plurality of apertures. Illustratively, the aperture assembly may be the aperture assembly 210 described above with respect to fig. 2, and more particularly, the aperture assembly may be the iris 300 described with respect to fig. 3-6, or other iris structures. Illustratively, the controller may be a driver chip 390 in the iris 300. The motor may be an aperture motor in the variable aperture 300. The blades may be blades 320 in the iris 300. In an embodiment of the application, the aperture assembly includes a plurality of blades, and the plurality of blades are annularly arranged to form a light inlet hole for light to pass through. Because the size of the light inlet hole is adjustable, the controller can form the light inlet hole with various apertures when controlling the motor to drive the blade to move.

As shown in fig. 9, the method 400 may include steps S410 to S440, and each step is described in detail below with reference to the accompanying drawings.

S410, the controller acquires the target aperture position of the diaphragm.

In some embodiments, the controller may receive an input signal or indication information indicating a target aperture position of the diaphragm. The input signal or indication information may be an aperture position or an aperture value, for example, which is not limited by the embodiment of the present application.

And S420, when the target aperture position of the diaphragm is the first target position, the controller controls the motor to drive the blade to move with the first constant current until the blade is fixed at the first target position through the first limiting part, wherein a light inlet of the first target position has the maximum aperture value.

That is, when the target aperture position of the diaphragm is the maximum aperture position, the controller controls the motor to drive the blade to move at a constant current (for example, a first constant current), and when the blade is limited by the first limiting portion, the diaphragm is at the first target position, that is, at the maximum aperture position.

In this step, the controller performs open loop control. The controller does not refer to the actual position of the diaphragm here, and considers that the diaphragm is at the first target position as long as the blade is limited by the first limiting portion.

In the embodiments of the present application and the following embodiments, the reference to "constant current" is understood to mean that the magnitude of the current input to the motor is constant during a certain switching of the aperture position. It will be appreciated that this is not limited to the magnitude of the current input to the motor being the same during the multiple switching of the aperture position. That is, in two processes in which the motor drives the blade movement with a constant current to achieve the aperture position switching, the current input to the motor is constant in magnitude for each aperture position switching process, and the magnitudes of the currents input to the motor in the two aperture position switching processes may be different.

In some embodiments, the controller controls the motor to drive the blade to move for a first preset time at a first constant current, and then considers that the blade is fixed at a first target position through the first limiting part.

In some embodiments, the first limiting portion may limit the movement of the motor-driven blade in one direction. That is, the first limiting portion may limit the motor driving blade to continue moving in a direction larger than the maximum aperture position when the diaphragm is at the maximum aperture position, but does not limit the motor driving blade to switch from the maximum aperture position to the smaller aperture position.

In the embodiment of the application, the blade may be fixed at the first target position by the first limiting part directly or indirectly. That is, the first limiting portion may directly limit the movement of the blade, or may indirectly limit the movement of the blade by limiting the movement of the motor, which is not limited in the embodiment of the present application.

And S430, when the target aperture position of the diaphragm is the second target position, the controller controls the motor to drive the blade to move with the second constant current until the blade is fixed at the second target position through the second limiting part, wherein a light inlet of the second target position has the minimum aperture value.

That is, when the target aperture position of the diaphragm is the minimum aperture position, the controller controls the motor to drive the blade to move at a constant current (for example, a second constant current), and when the blade is limited by the second limiting portion, the diaphragm is at the second target position, that is, at the minimum aperture position.

In this step, the controller performs open loop control. The controller does not refer to the actual position of the diaphragm here, and considers that the diaphragm is at the second target position as long as the blade is limited by the second limiting portion.

In some embodiments, the controller controls the motor to drive the blade at the second constant current for a second preset time, and then considers that the blade is fixed at the second target position by the second limiting portion.

In some embodiments, the second limiting portion may limit the movement of the motor-driven blade in one direction. That is, the second limiting portion may limit the motor driving blade to continue moving in a direction smaller than the minimum aperture position when the diaphragm is at the minimum aperture position, but does not limit the motor driving blade to switch from the minimum aperture position to the larger aperture position.

In the embodiment of the application, the blade is fixed at the second target position through the second limiting part either directly or indirectly. That is, the second limiting portion may directly limit the movement of the blade, or may indirectly limit the movement of the blade by limiting the movement of the motor, which is not limited in the embodiment of the present application.

And S440, when the target aperture position of the diaphragm is the third target position, the controller acquires the actual aperture position of the diaphragm, and according to the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm, the controller controls the motor to drive the blade to move to the third target position by the third current, wherein the aperture of the light inlet hole of the third target position is smaller than the maximum aperture value and larger than the minimum aperture value.

That is, when the target aperture position of the diaphragm is located between the maximum aperture position and the minimum aperture position, the controller can adjust the current of the motor driving blade through the deviation between the target aperture position and the actual aperture position to drive the blade to move to the target aperture position.

In this step, the controller performs closed-loop control. Here, the controller refers to the actual position of the diaphragm, and controls or adjusts the driving current by the deviation between the actual aperture position of the diaphragm and the target aperture position, so that the driving current output by the controller can automatically track the target aperture position. Therefore, in the embodiment of the present application, the magnitude of the third current dynamically changes with the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm. That is, the third current is a dynamic current.

In the embodiments of the present application and the following embodiments, the "dynamic current" is understood to mean that the magnitude of the current input to the motor is not always constant, i.e. the current varies, during a certain switching of the aperture position. Specifically, the current magnitude may vary according to the magnitude of the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm. Since the magnitude of the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm changes with the movement of the blade during a certain switching of the diaphragm position, the magnitude of the current for driving the motor to move correspondingly changes. It will be appreciated that this is not limited to the trend of the current input to the motor over the course of switching the aperture position a number of times. For example, in two processes in which the motor drives the movement of the blade with a dynamic current to achieve aperture position switching, the current input to the motor may be made smaller from larger to smaller for each aperture position switching process.

In the embodiment of the application, when the deviation between the actual aperture position and the target aperture position of the diaphragm is smaller than the preset threshold, the diaphragm is considered to be at the third target position.

In the aperture control method 400 provided by the embodiment of the application, when the target aperture position of the aperture is the maximum aperture position or the minimum aperture position, the aperture position is switched by adopting the combination of open loop control and mechanical limit. When the target aperture position of the diaphragm is positioned between the maximum aperture position and the minimum aperture position, closed loop control is adopted to realize the switching of the diaphragm position. The scheme can realize the accuracy, the rapidness and the stability of the aperture position control, so that the light quantity can be better controlled under different shooting scenes, and further, the image with good shooting quality can be obtained.

More specifically, when the target aperture position of the diaphragm is the maximum aperture position or the minimum aperture position, the open loop control is adopted to avoid the influence of the change of the relative position of the hall element and the magnet in the optical axis direction (i.e. the axial direction of the light inlet hole) on the diaphragm position control, so that the accuracy and the stability of the diaphragm position control can be improved. In addition, the position of the blade is limited by adopting mechanical limiting, so that the first constant current or the second constant current can be larger, the moving speed of the blade can be improved, and the rapidity of the aperture position control is improved.

It should be noted that, in the method 400 shown in fig. 9, the steps S420, S430 and S440 are optional steps in parallel, and after the target aperture position in the step S410 is determined, a corresponding one of the steps S420, S430 and S440 is performed.

In some embodiments, the motor includes a magnet and a coil, one of the magnet and the coil is a stator, and the other is a mover for moving the blade to change the aperture of the light entrance hole. When the target aperture position of the diaphragm is the first target position, a first constant current is used for being input into the coil to provide a first magnetic force for driving the mover to rotate around the axis of the light entrance hole. When the target aperture position of the diaphragm is the second target position, a second constant current is used for being input into the coil to provide a second magnetic force for driving the mover to rotate around the axis of the light inlet hole, wherein the direction of the first magnetic force is opposite to that of the second magnetic force.

Here both the first magnetic force and the second magnetic force are tangential to the radial direction of the mover, which radial direction is perpendicular to the axis of the light entry aperture.

In some embodiments, the first magnetic force is greater than the friction force experienced by the mover and the second magnetic force is greater than the friction force experienced by the mover.

When the motor is in a static state, the rotor is subjected to friction force, so that if the rotor is driven to rotate around the axis of the light inlet hole to drive the blades to move, the magnetic force generated by the current input into the coil at least overcomes the friction force applied to the rotor.

The first constant current means that the current of the driving motor is constant, that is, the current is constant in the process of switching the diaphragm position to the first target position, but it is not limited to the current of the driving motor being the same each time the diaphragm position is switched to the first target position. The second constant current means that the current of the driving motor is constant, that is, the current is constant in the course of switching the diaphragm position to the second target position, but it is not limited to the current of the driving motor being the same each time the diaphragm position is switched to the second target position.

In the embodiment of the application, the first constant current and the second constant current may be the same or different.

In some embodiments, the method 400 may further comprise: when the target aperture position of the diaphragm is the first target position, after the blade is fixed at the first target position, the controller controls the motor to drive the blade to keep at the first target position with a fourth constant current, wherein the fourth constant current is smaller than the first constant current and larger than 0; or when the target aperture position of the diaphragm is the second target position, after the blade is fixed at the second target position, the controller controls the motor to drive the blade to keep at the second target position with a fifth constant current, wherein the fifth constant current is smaller than the second constant current and larger than 0.

That is, when the position of the diaphragm reaches the target aperture position, the controller can reduce the current of the driving motor to keep the diaphragm at the target aperture position, which can reduce power consumption.

In the embodiment of the present application, the fourth constant current and the fifth constant current may be the same or different.

The fourth constant current means that the current of the driving motor is constant, that is, the current is constant in the process of holding the diaphragm position at the first target position, but it is not limited to the current of the driving motor being the same every time the diaphragm position is held at the first target position. The fifth constant current means that the current of the driving motor is constant, that is, the current is constant in the course of maintaining the diaphragm position at the second target position, but it is not limited to the current of the driving motor being the same every time the diaphragm position is maintained at the second target position.

In some embodiments, the method 400 may further comprise: when the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through the locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to the preset value.

In the embodiment of the application, when the stress on the aperture is greater than or equal to the preset value, the controller controls the motor to drive the blade to move to form the light inlet with the maximum aperture value no matter what aperture position the aperture is. That is, the diaphragm is switched to the position where the aperture is maximum regardless of the aperture position of the diaphragm. The aperture blade is in a contracted state, and the aperture blade can be fixed through the locking mechanism, so that the aperture blade can be protected, and the possibility that the aperture blade is damaged when being subjected to large stress is reduced.

In some embodiments, whether the aperture is in the preset scene may be determined from the gyroscope signal and/or the acceleration signal.

In some embodiments, the preset scene is a scene in which the aperture blade is easily damaged, and exemplary, the preset scene includes at least one of: the scene is flapped, the scene is flicked and the scene is dropped.

In some embodiments, when the aperture is in the preset scene, the manner in which the controller controls the motor to drive the blade to move so as to form the light inlet with the maximum aperture value may be open loop control or closed loop control.

For example, the controller may control the motor to drive the blade movement at a constant current to form the light entrance aperture having the maximum aperture value. The process is similar to the process in which the controller controls the diaphragm to switch to the first target position, and reference is made in detail to the description above regarding the switching of the diaphragm position to the first target position. Wherein the constant current may be the same as the first constant current or may be different from the first constant current.

For another example, the controller may control the motor to drive the blade movement with a dynamic current to form the light entrance hole having the maximum aperture value according to a deviation between an actual aperture position of the diaphragm and a maximum aperture position of the diaphragm. The process is similar to the process in which the controller controls the diaphragm to switch to the third target position, and reference is made to the description above regarding the switching of the diaphragm position to the third target position for details. Wherein the dynamic current dynamically varies with the deviation between the maximum aperture position of the aperture and the actual aperture position of the aperture.

In some embodiments, the method 400 may further comprise: before the motor is powered down, the controller controls the motor to drive the blades to move so as to form the light inlet hole with the maximum aperture value.

In the embodiment of the application, before the motor is powered down, the aperture is switched to the position with the largest aperture no matter what aperture position the aperture is. Therefore, the aperture blades are in a contracted state, so that the blades can be protected, and the possibility of damage to the blades is reduced.

In some embodiments, the method 400 may further comprise: after the motor is powered down, when the aperture is in a preset scene, the controller controls the motor to be powered up, and controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through the locking mechanism, and the stress of the aperture in the preset scene is greater than or equal to the preset value.

In the embodiment of the application, after the motor is powered down, if the aperture is subjected to larger stress, the controller can control the motor to be powered up again and switch the aperture to the position with the largest aperture. Therefore, the aperture blades are in a contracted state, so that the blades can be protected, and the possibility of damage to the blades is reduced.

In some embodiments, the first target position has an aperture value of less than or equal to 1.4 and the second target position has an aperture value of greater than or equal to 4.0.

The blades in the iris diaphragm are easily damaged due to the influence of external force under the scenes of large stress such as falling, flapping and swinging, and the like, and belong to vulnerable materials. In view of this, the embodiment of the application also provides a diaphragm control method, which can solve the problem of protection of the variable diaphragm blade.

The embodiment of the application provides a diaphragm control method which is applied to a diaphragm assembly. The method comprises the following steps: when the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through the locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to the preset value.

Illustratively, taking the iris diaphragm 300 described in fig. 3 as an example, fig. 10 shows a schematic view of the iris diaphragm 300 in a maximum aperture position. As shown in fig. 10, the vane 320 is in a contracted state and is covered by the upper cover 310. The upper cover 310 serves to protect the blades 320.

The locking mechanism according to the embodiment of the present application may be configured to fix the position of the diaphragm blade directly or fix the position of the diaphragm motor mover to fix the position of the blade, and the embodiment of the present application is not particularly limited thereto. The locking mechanism may be any structure capable of fixing the position of the blade, such as a ratchet and pawl mechanism.

In some embodiments, when the aperture is in a preset scene and the motor is in a power-on state, the controller controls the motor to drive the blade to move so as to form the light inlet with the maximum aperture value, and the method comprises the following steps: the controller controls the motor to drive the blade to move from the current position with a first constant current until the blade forms a light inlet hole with a maximum aperture value.

That is, when the motor is in a powered-on state and it is desired to switch the aperture to the maximum aperture position, the controller may perform open loop control to cause the motor to drive the blade movement at a first constant current.

In some embodiments, when the aperture is in a preset scene and the motor is in a powered-down state, the controller controls the motor to drive the blade to move so as to form the light inlet with the maximum aperture value, including: the controller controls the motor to be electrified; the controller controls the motor to drive the blade to move from the current position with a first constant current until the blade forms a light inlet hole with a maximum aperture value.

That is, when the motor is in a power-down state and the diaphragm needs to be switched to the maximum aperture position, the controller may control the motor to power up first and then perform open loop control, so that the motor drives the blade to move with the first constant current.

For easy understanding, the aperture control method provided in the embodiment of the present application is described below with reference to specific examples.

Fig. 11 shows a schematic flowchart of a diaphragm control method according to an embodiment of the present application. In fig. 11, for convenience of understanding, the iris diaphragm is exemplified by four steps of Z1, Z2, Z3, Z4 having F/4.0, F/2.8, F2.0, F1.4 in order, wherein the Z1 step has a minimum aperture value and the Z4 step has a maximum aperture value. It will be appreciated that the present application is not specifically limited to the number of gears included in the iris diaphragm and the diaphragm value for each gear, but is merely illustrative herein.

As shown in fig. 11, in a normal shooting scene, the motor needs to control different aperture stops to satisfy different shooting scenes.

If the target aperture position is the Z1 gear, the aperture position can be switched to the Z1 gear by adopting an open loop control combined with a mechanical limiting mode. Specifically, the controller may open loop control the motor to drive the blade to move with a first constant current until the blade is fixed to the Z1 gear by the first limit portion. When the diaphragm is adjusted to the Z1 gear, the diaphragm sensitivity value is large, the position change is sensitive, the positions of the Hall element and the magnet can be influenced by the clearance along the axis direction of the light inlet, and if closed-loop control is adopted, the feedback value can be inaccurate. Therefore, the process of adjusting the diaphragm to the Z1 gear is not suitable to use closed-loop control but to use open-loop control. Because the open loop control has no feedback information, the motor or the blades are blocked to move continuously by matching with the mechanical limit, the purpose of fixing the positions of the blades is achieved, and the accurate, quick and stable aperture gear control is realized.

If the target aperture position is the Z4 gear, the aperture position can be switched to the Z4 gear by adopting an open loop control combined with a mechanical limiting mode. Specifically, the controller may open loop control the motor to drive the blade to move with the second constant current until the blade is fixed to the Z4 gear through the second limiting portion. Because the open loop control has no feedback information, the motor or the blades are blocked to move continuously by matching with the mechanical limit, the purpose of fixing the positions of the blades is achieved, and the accurate, quick and stable aperture gear control is realized.

If the target aperture position is the Z2 gear or the Z3 gear, the aperture position can be switched to the Z2 gear or the Z3 gear by adopting a closed-loop control mode. Specifically, the actual aperture position fed back by the hall element is compared with the target aperture position to generate a deviation signal, and the current of the driving motor generated by the controller can be controlled and regulated by using the deviation signal, so that the output quantity of the closed-loop control system (namely, the aperture position to be switched to determined by the controller) can automatically track the input quantity (namely, the target aperture position), the tracking error is reduced, the control precision is improved, and the influence of the disturbance signal is restrained.

When the diaphragm gear is switched, it is necessary to switch between open-loop control and closed-loop control from the Z1 gear to the Z2 gear, from the Z2 gear to the Z1 gear, from the Z3 gear to the Z4 gear, or from the Z4 gear to the Z3 gear. When the target position is the Z2 gear or the Z3 gear, the diaphragm can be switched to the target position accurately and quickly by the closed-loop control. When the target position is the Z1 gear or the Z4 gear, the blades are fixed in a mechanical limiting mode based on open loop control, and the aperture can be quickly and accurately switched to the target position. In the embodiment of the application, the switching time between the closed-loop control and the open-loop control is within 10 ms.

In the embodiment of the application, the mode of combining open-closed loop control with mechanical limiting can be used for switching various aperture gears, so that the problems of inaccurate feedback of a Hall element, insensitive position of part of apertures and the like caused by more aperture gears can be solved, and the aim of arbitrarily switching the aperture gears is fulfilled. In addition, the open loop control combines with a mechanical limiting priming strategy, so that the accuracy of the open loop control is improved.

It can be understood that in a normal shooting scene, the motor of the iris diaphragm is in a power-on state, that is, the camera module applying the iris diaphragm is in a power-on state.

In some embodiments, during normal shooting, if the diaphragm is detected to be under large stress, an emergency protection scene is entered. As shown in fig. 11, in the emergency protection scene, no matter what position the diaphragm is, the diaphragm position is switched to the Z4 gear by adopting an open loop control combined with mechanical limiting, so that the diaphragm blade is in the contracted protection state. In general, in a scene such as flapping, dropping, whipping, etc., the diaphragm is subjected to a large stress. The diaphragm in the embodiment of the application is subjected to large stress, which can be understood as the stress to which the diaphragm is subjected is greater than or equal to a preset value. In a specific implementation, whether the aperture is in a high stress scene can be determined by a gyroscope signal and/or an acceleration signal. For example, when the angular velocity of the aperture assembly is greater than or equal to a first preset threshold and/or the acceleration of the aperture assembly is greater than or equal to a second preset threshold, it may be determined that the aperture is in a high stress scenario, but embodiments of the application are not limited thereto.

In the embodiment of the application, when the blades of the iris diaphragm are subjected to external large stress, for example, when the lens of the iris diaphragm is flapped, swung or fallen, the controller can control the iris diaphragm to be set to a Z4 gear, so that the blades are locked in a contracted state, and the possibility of damage to the blades of the iris diaphragm can be reduced.

In some embodiments, after normal shooting is completed, before the motor is powered down (or before the camera module applying the iris is powered down), the iris position is switched to the Z4 gear no matter where the iris is located, so that the iris blade is in a shrink protection state. In a specific implementation, the aperture blade may fix the position of the blade by friction and magnetic attraction between the magnetically permeable sheet and the magnet after the motor is powered down. Therefore, as shown in fig. 11, in the power-down scene, the position of the diaphragm defaults to the Z4 position.

In the embodiment of the application, the diaphragm is set to be in a Z4 gear before the motor is powered down, and the blades are locked to be in a contracted state, so that the blades can be protected from being influenced by the minimum external force, and the possibility of damaging the blades of the diaphragm is reduced.

In some embodiments, in a power-down scenario, it is desirable to detect in real-time whether the aperture is in a high stress scenario.

In some embodiments, in a power-down scenario, if a large stress is detected on the aperture, the motor is powered up and enters an emergency protection scenario. As shown in fig. 11, in the emergency protection scene, no matter what position the diaphragm is, the diaphragm position is switched to the Z4 gear by adopting an open loop control combined with mechanical limiting, so that the diaphragm blade is in the contracted protection state. In a specific implementation, whether the aperture is in a large stress scene can be judged through a gyroscope signal and an acceleration signal.

In the embodiment of the application, even if the aperture is in the power-down state, once the aperture is detected to be in a large-stress scene, a protection mechanism for the blade is triggered, namely, the position of the aperture is switched to the Z4 gear, so that the possibility of damage to the blade can be reduced.

In the embodiment of the application, the accuracy, the rapidity and the stability of the aperture gear control are realized by adopting a strategy of combining open loop control and closed loop control. Meanwhile, a large stress scene is detected in real time based on accelerometer and/or gyroscope signals, and an aperture is changed into a large aperture mode (namely, the aperture position is in a Z4 gear) through open loop control and a mechanical limiting mode in the scene, so that an emergency protection mechanism of the iris blade is realized. In addition, when the camera module applying the iris diaphragm is powered down, the large diaphragm mode is defaulted, so that the minimum external force influence and more ideal appearance design can be ensured.

Fig. 12 shows a schematic flow chart of open loop control and closed loop control provided by an embodiment of the present application. As shown in fig. 12, when the aforementioned open loop control method is adopted, the controller may control the motor to drive the blade movement at a constant current after acquiring the target aperture position, so as to switch the diaphragm to the target aperture position. When the closed-loop control mode is adopted, the Hall element can detect the actual aperture position of the aperture and feed back the actual aperture position to the controller, and the controller adjusts the driving current in real time according to the deviation between the target aperture position and the actual aperture position so as to switch the aperture to the target aperture position.

An embodiment of the present application provides a diaphragm controller configured to perform the aforementioned diaphragm control method.

The embodiment of the application provides an aperture assembly, which comprises a controller, a motor and blades, wherein the controller is used for controlling the motor to drive the blades to move so as to form light inlet holes with various apertures, and the controller is used for executing the aperture control method.

The embodiment of the application provides a camera module, which comprises a lens and the aperture assembly, wherein the aperture assembly is arranged at the front end of the lens to form a light inlet with various apertures.

An embodiment of the application provides an electronic device, which comprises a camera module and a shell for accommodating the camera module.

An embodiment of the present application provides an electronic device, including: one or more processors; one or more memories; the one or more memories store one or more computer programs, the one or more computer programs comprising instructions that, when executed by the one or more processors, cause the electronic device to perform the aforementioned aperture control method.

Embodiments of the present application provide a computer-readable storage medium comprising computer instructions that, when executed on an electronic device, cause the electronic device to perform the aforementioned aperture control method.

The embodiment of the application provides a chip, which comprises a processor and a data interface, wherein the processor reads instructions stored in a memory through the data interface so as to execute the aperture control method.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A diaphragm control method applied to a diaphragm assembly including a controller for controlling the motor to drive the blade to move to form a light inlet having a plurality of apertures, a motor and a blade, the method comprising:

The controller acquires a target aperture position of the aperture;

when the target aperture position of the diaphragm is a first target position, the controller controls the motor to drive the blade to move with a first constant current until the blade is fixed at the first target position through a first limiting part, wherein a light inlet hole of the first target position has the maximum aperture value in the multiple apertures;

When the target aperture position of the diaphragm is a second target position, the controller controls the motor to drive the blade to move with a second constant current until the blade is fixed at the second target position through a second limiting part, wherein a light inlet hole of the second target position has a minimum aperture value in the multiple apertures;

when the target aperture position of the diaphragm is a third target position, the controller acquires the actual aperture position of the diaphragm;

According to the deviation between the target aperture position of the diaphragm and the actual aperture position of the diaphragm, the controller controls the motor to drive the blade to move to the third target position with a third current, wherein the aperture of the light inlet of the third target position is smaller than the maximum aperture value and larger than the minimum aperture value.
The method of claim 1, wherein the magnitude of the third current dynamically varies with a deviation between a target aperture position of the diaphragm and an actual aperture position of the diaphragm.
A method according to claim 1 or 2, characterized in that,

When the target aperture position of the diaphragm is the first target position or the second target position, the controller performs open loop control;

The controller performs closed-loop control when a target aperture position of the diaphragm is the third target position.
A method according to any one of claims 1 to 3, wherein the motor comprises a magnet and a coil, one of the magnet and the coil being a stator, the other being a mover for moving the blade to change the aperture of the light inlet aperture;

when the target aperture position of the diaphragm is the first target position, the first constant current is used for being input into the coil so as to provide a first magnetic force for driving the rotor to rotate around the axis of the light inlet hole; or alternatively

When the target aperture position of the diaphragm is the second target position, the second constant current is used for being input into the coil so as to provide a second magnetic force for driving the rotor to rotate around the axis of the light inlet hole;

Wherein the first magnetic force is opposite to the second magnetic force.
The method according to any one of claims 1 to 4, further comprising:

when the target aperture position of the diaphragm is the first target position, after the blade is fixed at the first target position, the controller controls the motor to drive the blade to remain at the first target position with a fourth constant current, wherein the fourth constant current is smaller than the first constant current and greater than 0; or alternatively

When the target aperture position of the diaphragm is the second target position, the controller controls the motor to drive the blade to remain at the second target position with a fifth constant current after the blade is fixed at the second target position, wherein the fifth constant current is smaller than the second constant current and larger than 0.
The method according to any one of claims 1 to 5, further comprising:

When the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through a locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to the preset value.
The method of claim 6, wherein the controller controlling the motor to drive the blade to move to form the light entrance aperture having the maximum aperture value comprises:

The controller controls the motor to drive the blade to move with constant current so as to form the light inlet hole with the maximum aperture value; or alternatively

The controller controls the motor to drive the blade to move with dynamic current according to the deviation between the actual aperture position of the diaphragm and the maximum aperture position of the diaphragm so as to form the light inlet with the maximum aperture value.
The method according to any one of claims 1 to 7, further comprising:

Before the motor is powered down, the controller controls the motor to drive the blades to move so as to form a light inlet hole with the maximum aperture value.
The method of claim 8, wherein the method further comprises:

After the motor is powered down, when the aperture is in a preset scene, the controller controls the motor to be powered up, and controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through a locking mechanism, and the stress of the aperture in the preset scene is greater than or equal to the preset value.
Method according to claim 6 or 9, characterized in that the aperture being in a preset scene is determined from a gyroscope signal and/or an acceleration signal.
The method according to claim 6 or 9, wherein the preset scenes comprise at least one of the following: the scene is flapped, the scene is flicked and the scene is dropped.
The method of any one of claims 1 to 11, wherein the first target position has an aperture value of less than or equal to 1.4 and the second target position has an aperture value of greater than or equal to 4.0.
A diaphragm control method applied to a diaphragm assembly including a controller for controlling the motor to drive the blade to move to form a light inlet having a plurality of apertures, a motor and a blade, the method comprising:

When the aperture is in a preset scene, the controller controls the motor to drive the blades to move so as to form a light inlet hole with a maximum aperture value, wherein the blades are fixed through the locking mechanism, and the stress of the aperture in the preset scene is larger than or equal to a preset value.
The method of claim 13, wherein when the aperture is in a preset scene and the motor is in a powered-on state, the controller controlling the motor to drive the blades to move to form a light entrance hole having a maximum aperture value, comprising:

The controller controls the motor to drive the blade to move from a current position with a first constant current until the blade forms the light inlet hole with the maximum aperture value.
The method of claim 13, wherein when the aperture is in a preset scene and the motor is in a powered-down state, the controller controlling the motor to drive the blades to move to form a light entrance hole having a maximum aperture value, comprising:

The controller controls the motor to be electrified;

The controller controls the motor to drive the blade to move from a current position with a first constant current until the blade forms the light inlet hole with the maximum aperture value.
Method according to any one of claims 13 to 15, wherein the aperture being in a preset scene is determined from a gyroscope signal and/or an acceleration signal.
The method according to any one of claims 13 to 16, wherein the preset scenes comprise at least one of the following: the scene is flapped, the scene is flicked and the scene is dropped.
An aperture controller, characterized in that the aperture controller is configured to perform the method of any one of claims 1 to 17.
An aperture assembly comprising a controller for controlling the motor to drive the blades in motion to form an aperture having a plurality of apertures, a motor and blades, wherein the controller is for performing the method of any of claims 1 to 17.
A camera module comprising a lens and the aperture assembly of claim 19, wherein the aperture assembly is disposed at a front end of the lens to form an entrance aperture having a plurality of apertures.
An electronic device comprising the camera module of claim 20 and a housing for housing the camera module.
An electronic device, comprising:

one or more processors;

One or more memories;

The one or more memories store one or more computer programs comprising instructions that, when executed by the one or more processors, cause the electronic device to perform the method of any of claims 1-17.
A computer readable storage medium comprising computer instructions which, when run on an electronic device, cause the electronic device to perform the method of any one of claims 1 to 17.
A chip comprising a processor and a data interface, the processor reading instructions stored on a memory via the data interface to perform the method of any one of claims 1 to 17.