WO2023246556A1 - Procédé de commande d'ouverture, dispositif de commande d'ouverture, module de caméra et dispositif électronique - Google Patents

Procédé de commande d'ouverture, dispositif de commande d'ouverture, module de caméra et dispositif électronique Download PDF

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Publication number
WO2023246556A1
WO2023246556A1 PCT/CN2023/099821 CN2023099821W WO2023246556A1 WO 2023246556 A1 WO2023246556 A1 WO 2023246556A1 CN 2023099821 W CN2023099821 W CN 2023099821W WO 2023246556 A1 WO2023246556 A1 WO 2023246556A1
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WO
WIPO (PCT)
Prior art keywords
aperture
motor
blade
target
drive
Prior art date
Application number
PCT/CN2023/099821
Other languages
English (en)
Chinese (zh)
Inventor
李张成
王怡沁
戴佳志
姚航
李智信
赵文博
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN202380013856.XA priority Critical patent/CN118103770A/zh
Publication of WO2023246556A1 publication Critical patent/WO2023246556A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • G03B9/06—Two or more co-operating pivoted blades, e.g. iris type

Definitions

  • Embodiments of the present application relate to the technical field of electronic equipment, and more specifically, to an aperture control method, an aperture controller, a camera module, and an electronic device.
  • variable apertures For this reason, camera modules with variable apertures emerged. Specifically, by setting a variable aperture on the front end of the lens of the camera module, the aperture size for light to pass through can be adjusted, thereby adjusting the amount of light entering.
  • Controlling the amount of light entering has an important impact on imaging quality. It is very important to provide an aperture gear control strategy to obtain better-quality images in different shooting scenarios.
  • Embodiments of the present application provide an aperture control method, an aperture controller, a camera module and an electronic device, which can obtain images with better shooting quality in different shooting scenarios.
  • an aperture control method is provided, which is applied to an aperture assembly.
  • the aperture assembly includes a controller, a motor and a blade.
  • the controller is used to control the motor to drive the movement of the blade to form an aperture with multiple apertures.
  • light entrance hole the method includes:
  • the controller controls the motor to drive the blade to move with a first constant current until the blade is fixed to the first target through the first limiting part.
  • the controller controls the motor to drive the blade to move with a second constant current until the blade is fixed to the second target through the second limiting part. position, wherein the light entrance hole of the second target position has the smallest aperture value among the plurality of apertures;
  • the controller obtains the actual aperture position of the aperture
  • the magnitude of the third current changes dynamically with the deviation between the target aperture position of the aperture and the actual aperture position of the aperture.
  • the controller adjusts the size of the third current in real time according to the deviation between the target aperture position and the actual aperture position to stably switch the aperture position.
  • the controller when the target aperture position of the aperture is the first target position or the second target position, the controller performs open-loop control; when the When the target aperture position of the aperture is the third target position, the controller performs closed-loop control.
  • the second constant current is used to input into the coil to drive the mover to rotate around the axis of the light inlet. the second magnetic force;
  • the controller can reduce the current of the drive motor to keep the aperture at the target aperture position, which can reduce power consumption.
  • the controller controls the motor to drive the movement of the blades to form a light entrance hole with a maximum aperture value, which can be open-loop control or closed-loop control.
  • the method further includes: after the motor is powered off, when the aperture is in a preset scene, the controller controls the motor to be powered on, and The motor is controlled to drive the movement of the blade to form a light entrance hole with a maximum aperture value, wherein the blade is fixed by a locking mechanism, and the stress experienced by the aperture in the preset scene is greater than or equal to the preset value.
  • the controller can control the motor to power on again and switch the aperture to the position with the largest aperture. In this way, the aperture blades are in a contracted state, which can reduce the possibility of damage to the blades.
  • the preset scene includes at least one of the following scenes: a beating scene, a swinging scene, and a falling scene.
  • 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.
  • an aperture control method is provided, which is applied to an aperture assembly.
  • the aperture assembly includes a controller, a motor and a blade.
  • the controller is used to control the motor to drive the movement of the blade to form an aperture with multiple apertures.
  • Light entrance hole the method includes: when the aperture is in a preset scene, the controller controls the motor to drive the blade movement to form a light entrance hole with a maximum aperture value, wherein the blade is fixed by a locking mechanism , the stress experienced by the aperture in the preset scene is greater than or equal to the preset value.
  • the controller controls the motor to drive the blade to move to form an aperture with a maximum aperture.
  • the light inlet hole with the maximum aperture value includes: the controller controls the motor to drive the blade with a first constant current to move from the current position until the blade forms the light inlet hole with the maximum aperture value.
  • the aperture being in a preset scene is determined based on a gyroscope signal and/or an acceleration signal.
  • the preset scene includes at least one of the following scenes: a beating scene, a swinging scene, and a falling scene.
  • an aperture controller is provided, the aperture controller being configured to perform the above-mentioned first aspect and the method in any possible implementation of the first aspect, or to perform the above-mentioned second aspect and the second aspect. method in any possible implementation.
  • an aperture controller is provided, which is included in an electronic device.
  • the device has the function of realizing the behavior involved in the above-mentioned first aspect and any possible implementation of the first aspect, or It has the function of realizing the behavior involved in the above-mentioned second aspect and any possible implementation of the second aspect.
  • This function can be implemented by hardware, or can be implemented by hardware executing corresponding software.
  • Hardware or software includes one or more modules or units or circuits corresponding to the above functions. For example, signal processing circuits, control circuits, drive circuits, etc.
  • an aperture assembly including a controller, a motor and a blade.
  • the controller is used to control the motor to drive the movement of the blade to form a light entrance hole with multiple apertures, wherein the controller is used to Perform the method in the above-mentioned first aspect and any possible implementation of the first aspect, or perform the method in the above-mentioned second aspect and any possible implementation of the second aspect.
  • a camera module including a lens and the aperture component in the fourth aspect.
  • the aperture component is disposed at the front end of the lens to form a light inlet with multiple apertures.
  • an electronic device including the camera module in the fifth aspect and a housing for accommodating the camera module.
  • a computer-readable storage medium including computer instructions.
  • the electronic device causes the electronic device to execute the above-mentioned first aspect and any possible implementation of the first aspect.
  • the method in the manner, or perform the above second aspect and the method in any possible implementation manner of the second aspect.
  • a computer program product containing instructions is provided.
  • the computer program product When the computer program product is run on a computer, it causes the computer to execute the method in the above-mentioned first aspect and any possible implementation of the first aspect, or to execute the above-mentioned method.
  • a chip in an eleventh aspect, includes a processor and a data interface.
  • the processor reads instructions stored on the memory through the data interface to execute the above-mentioned first aspect and the first aspect.
  • the method in any possible implementation manner, or the method in any possible implementation manner of performing the above second aspect and the second aspect.
  • the chip may further include a memory, in which instructions are stored, and the processor is configured to execute the instructions stored in the memory.
  • the The processor is configured to perform the method in the above-mentioned first aspect and any possible implementation of the first aspect, or to perform the method in the above-mentioned second aspect and any possible implementation of the second aspect.
  • the above-mentioned chip may specifically be a field programmable gate array or an application specific integrated circuit.
  • FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Figure 2 is a schematic structural diagram of a camera module provided by an embodiment of the present application.
  • Figures 3-6 are schematic structural diagrams of an variable aperture provided by embodiments of the present application.
  • FIG. 7 is a schematic diagram of a variable aperture gear provided by an embodiment of the present application.
  • Figure 8 is a schematic diagram of the aperture position detected by the Hall element during the entire stroke of the motor.
  • FIG. 9 is a schematic flow chart of an aperture control method provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of the variable aperture provided by the embodiment of the present application at the maximum aperture position.
  • Figure 11 is a schematic flow chart of an aperture control method provided by an embodiment of the present application.
  • first, second, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined by “first,” “second,” etc. may explicitly or implicitly include one or more of such features.
  • vertical involved in this application is not vertical in the strict sense, but within the allowable error range.
  • Parallel is not parallel in the strict sense, but within the allowable error range.
  • the terms “upper”, “lower”, “inner”, “outer”, “vertical”, “horizontal”, etc. indicate an orientation or positional relationship that is schematically placed relative to the components in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, rather than indicating or implying that the device or component referred to must have a specific orientation, or Constructed and operated in a specific orientation, it may change accordingly depending on the orientation in which the components are placed in the drawings, and therefore should not be construed as a limitation of the present application.
  • Aperture is a device used to control the amount of light entering the photosensitive surface of the camera body through the lens.
  • the size of the aperture controls the amount of light that enters, and also controls the size of the background blur (that is, it controls the depth of field of the picture).
  • the larger the aperture the more light enters and the brighter the picture.
  • the smaller the aperture the less light enters and the darker the picture.
  • the larger the aperture the shallower the depth of field and the more obvious the background blur (i.e. the background is blurred).
  • the smaller the aperture the deeper the depth of field and the clearer the background.
  • Aperture value used to express the size of the aperture, usually represented by F.
  • the aperture value i.e. F value
  • the aperture value is inversely proportional to the aperture size. The larger the aperture, the smaller the aperture value.
  • the generally common F value sequence i.e.
  • aperture gear is as follows: F1.4, F2, F2.8, F4, F5.6, F8, F11, F16, F22, F32, F44, F64, among which for two adjacent F value, The amount of light transmitted by the former is twice that of the latter.
  • the commonly used expression is F1.4 or F/1.4.
  • Aperture blades are a set of overlapping sheet-like components within the aperture that adjust the clear aperture.
  • the variable aperture includes a plurality of blades arranged in an annular shape to form a light entrance hole for light to pass through. By driving multiple blades to move, the size of the light entrance hole can be adjusted to achieve the purpose of changing the amount of light entering.
  • Auto focus can refer to the use of the lens imaging principle and the light reflection principle.
  • the light reflected by the subject can be imaged on the image sensor after passing through the lens; according to the object distance of the subject, by moving one or more Lenses that form a clear image on the image sensor.
  • Autofocus can simply be thought of as the movement of the lens along the optical axis relative to the image sensor.
  • Optical image stabilization can mean that by adjusting the angle and position of the lens relative to the image sensor, the instrument jitter that occurs during the capture of optical signals can be reduced, thereby improving the imaging quality.
  • One possible method is to detect the displacement or angle to be compensated through, for example, a gyroscope, and then drive the lens or image sensor through a motor to translate or rotate, so that the image blur caused by the shake of the imaging instrument during exposure can be compensated.
  • Optical image stabilization can be simply regarded as the translation or rotation of the lens relative to the image sensor on a plane perpendicular to the optical axis.
  • the electronic device 100 involved in the embodiment of the present application is an electronic device with imaging functions (such as video or photography), such as a mobile phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, and a laptop computer (laptop computer). computer), video camera, video recorder, camera, smart watch, smart wristband, car computer, TV (or smart screen), etc.
  • imaging functions such as video or photography
  • the embodiment of the present application does not place any special restrictions on the specific form of the electronic device 100 .
  • the following description takes the electronic device 100 as a mobile phone as an example.
  • (a) and (b) in FIG. 1 schematically illustrate the front and back of the electronic device 100, respectively.
  • the electronic device 100 may include a housing 101, a display panel (display panel, DP) 102, and a camera compact module (CCM) 103.
  • a display panel display panel
  • CCM camera compact module
  • the housing 101 forms a storage space for accommodating components of the electronic device 100 .
  • the housing 101 can also play a role in protecting the electronic device 100 and supporting the entire machine.
  • the display screen 102 and the camera module 103 are arranged in the accommodation space of the housing 101 and connected to the housing 101 .
  • the housing 101 may include a back 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 on 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 can be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) display screen, etc., wherein the OLED display screen can 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, etc.
  • the display screen 102 may be disposed on the front and/or back of the electronic device 100 .
  • the front side of the electronic device 100 can be understood as the side facing the user when the user uses the electronic device 100
  • the back side of the electronic device 100 can be understood as the 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 videos.
  • the camera module 103 can be disposed on the front and/or back of the electronic device 100 .
  • the camera module 103 can be used to take pictures of people located on the electronic device 100.
  • the scene on the front side of the sub-device 100 for example, used for selfies, may be called a front camera in some embodiments.
  • the camera module 103 is disposed on the back of the electronic device 100, it can be used to capture the scene on the back side of the electronic device 100. In some embodiments, it can be called a rear camera.
  • users can choose the corresponding camera module according to their shooting needs.
  • the camera module 103 can be a vertical module or a foldable module.
  • the upright camera module can be understood as the light entering the camera module directly hits the image sensor, and the light path is not bent.
  • Folding camera modules can be understood as the light entering the camera module needs to pass through reflectors, lenses, prisms and other components before hitting the image sensor, and the light path is folded. Folding camera modules can also be called periscope camera modules.
  • the camera module 103 can be a telephoto camera module or a wide-angle camera module.
  • the camera module 103 can be a fixed focus module or a zoom module, where the zoom module can include a manual zoom module and an automatic zoom module.
  • the installation position of the camera module 103 in Figure 1 is only schematic.
  • the camera module 103 can be installed at any position on the front of the electronic device 100 except the display screen 102 , such as the left side of the earpiece, the upper middle of the electronic device 100 , or the lower part of the electronic device 100 . chin) or the four corners of the electronic device 100, etc.
  • the camera module 103 can also be disposed in a hollowed-out area on the display screen 102 .
  • the camera module 103 is used as a rear camera, it can be installed at any position on the back of the electronic device 100, such as the upper left corner, the upper right corner or the upper middle position.
  • the camera module 103 may not be disposed on the main body of the electronic device 100 , but may be disposed on an edge protruding relative to the main body of the electronic device 100 , or on a component that is movable or rotatable relative to the electronic device 100 , wherein the component can be retracted or rotated from the main body of the electronic device 100 so that the camera module 103 can be hidden inside the electronic device 100 or at least partially ejected from the electronic device 100 .
  • the camera module 103 can be rotated 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, the scene on the front side of the electronic device 100 can be photographed. The scene located on the back side of the electronic device 100 can be photographed.
  • the camera module 103 when the display screen 101 can be folded, the camera module 103 can be used as a front camera or a rear camera as the display screen 102 is folded.
  • the embodiment of the present application does not limit the number of camera modules 103, which can be one, two, four or even more.
  • one or more camera modules 103 can be installed on the front of the electronic device 100, and/or on One or more camera modules 103 are provided on the back of the electronic device 100 .
  • the multiple camera modules 103 may be completely the same or different.
  • the multiple camera modules 103 may have different lens optical parameters, different lens placement positions, and different lenses.
  • the shapes are different.
  • the embodiments of the present application do not place any restrictions on the relative positions of multiple camera modules when they are installed.
  • the electronic device 100 may also include 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 .
  • the protective lens 104 can only cover the front camera module or cover the entire front of the electronic device 100 .
  • the protective lens 104 covers the entire front of the electronic device 100, it can be used to protect the front camera module and the display screen 102 at the same time.
  • the protective lens 104 is the cover glass (CG).
  • the protective lens 104 is used to protect the rear camera, the protective lens 104 can cover the entire back of the electronic device 100, or can be only disposed at a position corresponding to the rear camera module.
  • the protective lens 104 may be made of glass, sapphire, ceramic, etc., and is not particularly limited in the embodiment of the present application. In some embodiments, the protective lens 104 is transparent, and light from outside the electronic device 100 can enter the camera module 103 through the protective lens 104 .
  • the electronic device 100 may It includes more or fewer components than shown in the figure.
  • the electronic device 100 may also include one or more components such as batteries, flashlights, fingerprint recognition modules, earpieces, buttons, sensors, etc.
  • the electronic device 100 may also be configured Parts arrangement differs from that shown in the illustration.
  • variable apertures By setting a variable aperture on the front end of the lens of the camera module, the aperture size for light to pass through can be adjusted, thereby adjusting the amount of light entering and controlling the depth of field of the picture. For example, adjusting the size of the variable aperture can adapt to different lighting conditions and focusing distances, thereby helping users better adjust the amount of light and background blur to adapt to different scene needs.
  • FIG. 2 shows a schematic structural diagram of a camera module provided by an embodiment of the present application.
  • the camera module 200 in FIG. 2 may be an exemplary structure of the camera module 103 in FIG. 1 .
  • the optical axis direction of the camera module 200 is defined as the Z direction
  • the object direction side in the optical axis direction is the front side
  • the direction side opposite to the object is the rear side.
  • the first direction perpendicular to the optical axis is the X direction
  • the second direction perpendicular to the optical axis and the first direction is the Y direction.
  • the camera module 200 may include an aperture component 210 , a lens 220 , a driving component 230 and an image sensor component 240 .
  • the lens 220 is used to image the scene on the object side onto the imaging plane on the image side.
  • the lens 220 may include a lens barrel and one or more lenses disposed in the lens barrel.
  • lens 220 may be a fixed focus lens or a zoom lens.
  • lens 220 may be a wide-angle lens, a standard lens, or a telephoto lens.
  • lens 220 may be an upright lens or a periscope lens.
  • the driving component 230 is used to drive the lens 220 to move to achieve automatic focusing and/or optical image stabilization.
  • the driving assembly 230 may include a motor for moving the lens 220 for autofocus (hereinafter referred to as an AF motor) and a motor for moving the lens 220 for optical image stabilization (hereinafter referred to as an OIS motor).
  • the AF motor is used to move the lens 220 in the Z direction (ie, the direction of the optical axis) for automatic focusing
  • the OIS motor is used to move the lens 220 in the X direction or the Y direction (ie, the direction perpendicular to the optical axis) for optical image stabilization. .
  • the AF motor and the OIS motor can be two independent components, which independently drive the lens 220 to perform AF and OIS respectively.
  • the AF motor and the OIS motor can also be the same component. This component can drive the lens 220 to perform AF and also drive the lens 220 to perform OIS.
  • the AF motor and/or OIS motor can be a voice coil motor (VCM), a shape memory alloy (shape memory alloy, SMA) motor, a stepping motor (stepping motor), a piezoelectric motor ( piezoelectric motor) etc.
  • VCM voice coil motor
  • SMA shape memory alloy
  • stepping motor stepping motor
  • piezoelectric motor piezoelectric motor
  • the image sensor assembly 240 is disposed on the rear side of the lens 220 and is mainly used for imaging. Specifically, the light reflected by the object passes through the lens 220 and is projected onto the photosensitive surface of the image sensor assembly 240 . To get a clear image, The lens imaging principle can be utilized to drive the lens 220 to move to an appropriate position through the driving assembly 230 . Therefore, the light can be focused on the photosensitive surface of the image sensor assembly 240 to form a clear optical image.
  • the image sensor assembly 240 can convert optical images into electrical signals to obtain image signals.
  • image sensor assembly 240 may include an image sensor as well as other peripheral devices and support structures.
  • the light from outside the camera module 200 enters the lens 220 through the light entrance hole of the aperture component 210, and the light passing through the lens 220 finally reaches the image sensor component for development and imaging.
  • the aperture component 210 can also play a role in controlling the depth of field. Generally speaking, a larger aperture means a smaller depth of field; a smaller aperture means a larger depth of field.
  • FIG. 4 shows an exploded schematic view of the upper cover 310 separated from the variable aperture 300 .
  • the aperture of the light inlet hole formed by the plurality of blades 320 is smaller than or equal to the aperture of the through hole provided on the upper cover 310 .
  • the light inlet hole formed by the plurality of blades 320 is circular or polygonal (for example, a regular polygon).
  • the aperture of the light entrance hole can be understood as the diameter of the circular light entrance hole.
  • the aperture of the light entrance hole can be understood as the diameter of the inscribed circle of the polygonal light entrance hole.
  • the blades 320 may be in the shape of a sickle.
  • the fixing assembly 330 may include a fixing carrier 331 , a coil 332 and a base 333 .
  • the fixed carrier 331 and the base 333 are covered together to form a receiving space for accommodating the rotating assembly 340.
  • the fixed carrier 331 and the base 333 are both hollow structures.
  • the fixed carrier 331 and the base 333 have a ring structure.
  • the coil 332 is fixedly connected to the fixed carrier 331 and/or the base 333 .
  • the coil 332 may be fixedly connected to the flexible circuit board 350 .
  • the coil 332 is electrically connected to the flexible circuit board 350 .
  • 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.
  • the rotating carrier 341 has an annular structure.
  • the fixed carrier 331 is sleeved on the rotating carrier 341, and the coil 332 and the magnet 342 are arranged oppositely in a direction perpendicular to the optical axis.
  • 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 can serve as a set of coil-magnets.
  • one or more sets of coil-magnets can be provided. When multiple sets of coil-magnets are provided, the multiple sets of coil-magnets are evenly distributed in the circumferential direction perpendicular to the optical axis.
  • the fixing 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 and facing the blade 320 .
  • There are a plurality of positioning posts 3312 the plurality of positioning posts 3312 are annularly distributed around the optical axis, and the plurality of positioning posts 3312 correspond to the plurality of blades 320 one-to-one.
  • Each blade 320 is rotationally connected to the fixed carrier 331 through a positioning post 3312. That is to say, the blade 320 can rotate around the corresponding positioning post 3312.
  • the blade 320 can be driven to rotate around the corresponding positioning post 3312, thereby adjusting the aperture size of the light entrance hole and thereby adjusting the amount of light. More specifically, in the assembled state, the coil 332 and the magnet 342 are arranged oppositely in a direction perpendicular to the optical axis. When the coil 332 is energized, a Lorentz force will be generated between the coil 332 and the magnet 342. The Lorentz force The force is tangent to the radial direction of the rotating component 340, that is, the Lorentz force is a tangential force.
  • the plurality of blades 320 rotate around their respective positioning posts 3312 at the same time, thereby realizing the opening and closing of the plurality of blades 320.
  • the aperture size of the light entrance hole formed by the plurality of blades 320 changes.
  • 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.
  • the first through hole 312 and the first groove 313 both pass through the upper cover body 311. 311Thickness along the optical axis.
  • the first through hole 312 is used for the positioning post 3312 to pass through, and the first slot 313 is used for the guide post 3412 to pass through. Since the guide post 3412 is movable, the shape of the first groove 313 is adapted to the movement trajectory of the guide post 3412. For example, the guide post 3412 rotates around the direction of the optical axis, and its movement trajectory is arc-shaped.
  • the first groove 313 may be an arc-shaped groove, but the application is not limited thereto. In some other embodiments, the first groove 313 can also have other shapes, as long as the first groove 131 does not hinder the movement of the guide post 3412.
  • the number of the first through holes 312 is multiple, and the multiple first through holes 312 correspond to the multiple positioning posts 3312 one by one.
  • There are a plurality of first grooves 313 and the plurality of first grooves 313 correspond to the plurality of guide posts 3412 one-to-one.
  • the plurality of first through holes 312 are distributed annularly around the optical axis direction.
  • the plurality of first grooves 313 are distributed annularly around the optical axis direction.
  • the flexible circuit board 350 is surrounding the outer surface of the fixing component 330 .
  • the flexible circuit board 350 is used to transmit driving current to the coil 332 .
  • variable aperture 300 may further include a gasket 360 , which is disposed between the blade 320 and the rotating carrier 341 and may protect the blade 320 .
  • the gasket 360 can avoid large-area contact between the blade 320 and the rotating carrier 341, and can reduce the friction of the blade 320 during movement, thereby extending the service life of the blade 320.
  • the spacer 360 is annular and can be used as an aperture of a certain gear.
  • variable aperture 300 may further include a ball 370 disposed between the fixed carrier 331 and the rotating carrier 341 .
  • a first receiving groove 3313 is provided on the side of the first annular body 3311 of the fixed carrier 331 facing the rotating carrier 341, and the first receiving groove 3313 extends in a circumferential direction perpendicular to the optical axis.
  • the second annular main body 3411 of the rotating carrier 341 is provided with a second receiving groove 3413 on the side facing the fixed carrier 331, and the second receiving groove 3413 extends along the circumferential direction perpendicular to the optical axis. Part of the ball 370 is received in the first receiving groove 3313, and part is received in the second receiving groove 3413.
  • the balls 370 roll in the space formed by the first receiving groove 3313 and the second receiving groove 3413, which can reduce the friction force during the rotation of the rotating carrier 341 and is beneficial to lifting the rotating carrier.
  • the smoothness of 341 spins.
  • the extension length of the first receiving groove 3313 and/or the second receiving groove 3413 is greater than or equal to the rotation stroke of the rotating carrier 341 .
  • the first receiving groove 3313 runs through the wall thickness of the first annular body 3311 of the fixed carrier.
  • the first receiving groove 3313 and the second receiving groove 3413 are filled with lubricating oil to reduce friction between the ball and the fixed carrier 331 and the rotating carrier 341 during motion.
  • variable aperture 300 may further include a magnetically permeable sheet 380 .
  • the magnetically conductive sheet 380 is disposed at an end of the fixing component 330 away from the blade 320 .
  • the magnetically 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, and this force can attract the rotating component 340, ensuring that in any state, the ball 370 can be pressed against the first receiving groove 3313 and the second receiving groove 3413, so that the rotating component 340 rotates smoothly, and can reduce or avoid the movement of the rotating assembly 340 along the optical axis during rotation, which affects the accuracy of aperture gear control.
  • the driving chip 390 may be surrounded by the coil 332. During the rotation of the rotating assembly 340, the driving chip 390 may sense changes in the magnetic field of the magnet 342, thereby determining the position of the aperture. In some embodiments, the driving chip 390 includes a Hall element, so the driving chip 390 can detect the position of the aperture through the Hall element.
  • the position of the aperture involved here can be understood as the position of the aperture of the light entrance hole, and can also be understood as the opening and closing size of the blade 320 .
  • variable aperture 300 introduced in FIGS. 3 to 6 is only an exemplary structure. In other embodiments, other forms of variable apertures may also be used, which will not be described in detail here.
  • the light entrance holes of different aperture gears have different sizes, so the amount of light entering is different. Control of the amount of incident light has an important impact on imaging quality.
  • the currently provided aperture gear control scheme uses closed-loop control. Specifically, the driver chip obtains the target position of the aperture and the actual position of the aperture, and controls the current used by the aperture motor to drive the movement of the blades through the deviation between the actual position of the aperture and the target position.
  • the actual position of the aperture is detected by a Hall element (such as a Hall sensor). Taking the variable aperture 300 shown in FIGS. 3 to 6 as an example, the Hall element is fixed relative to the mover in the aperture motor, for example, the Hall element is fixed to the fixed carrier 331 .
  • the Hall element detects the actual position of the aperture by sensing changes in the magnetic field when the mover rotates relative to the stator around the optical axis.
  • the mover rotates relative to the stator around the optical axis, affected by the attitude of the variable aperture and external forces, the mover may also move along the optical axis relative to the stator, thus affecting the relative relationship between the Hall element and the magnet.
  • the aperture position detected by the Hall element is at the end aperture position (such as the maximum aperture position and the minimum aperture position), that is, Hall
  • the accuracy of the aperture position detected by the Er element is low. Based on this, when the closed-loop control aperture is used to switch to the end aperture position, the control accuracy is low. In other words, the aperture is not actually at the end aperture position, so the amount of light entering will deviate greatly from the required amount of light entering, thus affecting the image quality.
  • the driver chip when performing closed-loop control of the end aperture position of the aperture, the driver chip will adjust the drive current in real time based on the deviation between the aperture position detected by the Hall element and the target position. Users using the variable aperture will perceive the aperture The movement of the motor affects the user's experience.
  • FIG. 9 shows a schematic flow chart of an aperture control method provided by an embodiment of the present application.
  • the method 400 may include steps S410 to S440. Each step will be described in detail below with reference to the accompanying drawings.
  • the controller obtains the target aperture position of the aperture.
  • the controller may receive an input signal or indication information for indicating a target aperture position of the aperture.
  • the input signal or indication information may be an aperture gear or an aperture value, which is not limited in the embodiment of the present application.
  • 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 the light entering the first target position
  • the hole has the maximum aperture value.
  • the controller controls the motor to drive the blade to move with a constant current (for example, a first constant current).
  • a constant current for example, a first constant current.
  • the controller performs open-loop control.
  • the controller does not refer to the actual position of the aperture.
  • the aperture is considered to be at the first target position.
  • the “constant current” involved can be understood to mean that the magnitude of the current input to the motor is constant during a certain process of switching the aperture position. But it can be understood that this does not limit the magnitude of the current input to the motor to be the same during the process of switching the aperture position multiple times. That is to say, in the two processes in which the motor drives the blade to move with a constant current to achieve aperture position switching, for each aperture position switching process, the current input to the motor remains unchanged, and the two aperture position switching processes The amount of current input to the motor can be different during the process.
  • the controller controls the motor to drive the blade to move with a first constant current for a first preset time, it is considered that the blade is fixed at the first target position through the first limiting part.
  • the first limiting part can unidirectionally limit the movement of the blade driven by the motor. That is to say, the first limiting portion can limit the motor-driven blade to continue to move in a direction greater than the maximum aperture position when the aperture is at the maximum aperture position, but does not limit the motor-driven blade to switch from the maximum aperture position to a smaller aperture. Location.
  • the method of fixing the blade to the first target position through the first limiting part may be direct or indirect. That is to say, the first limiting part 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 embodiments of the present application.
  • 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 the light entering the second target position
  • the hole has a minimum aperture value.
  • the controller controls the motor to drive the blade movement with a constant current (for example, a second constant current).
  • a constant current for example, a second constant current.
  • the controller performs open-loop control.
  • the controller does not refer to the actual position of the aperture.
  • the aperture is considered to be at the second target position.
  • the controller controls the motor to drive the blade to move with a second constant current for a second preset time, it is considered that the blade is fixed at the second target position through the second limiting part.
  • the method of fixing the blade to the second target position through the second limiting part may be direct or indirect. That is to say, the second limiting portion can directly limit the movement of the blade, or can indirectly limit the movement of the blade by limiting the movement of the motor, which is not limited in the embodiments of the present application.
  • the controller obtains the actual aperture position of the aperture, and according to the deviation between the target aperture position of the aperture and the actual aperture position of the aperture, the controller controls the motor to drive with the third current
  • the blade moves to a third target position, where the aperture of the light entrance hole at the third target position is smaller than the maximum aperture value and larger than the minimum aperture value.
  • the controller can adjust the current of the motor-driven blade through the deviation between the target aperture position and the actual aperture position to drive the blade to move to the target Aperture location.
  • the controller performs closed-loop control.
  • the controller refers to the actual position of the aperture, and controls or adjusts the driving current through the deviation between the actual aperture position of the aperture 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 changes dynamically with the deviation between the target aperture position of the aperture and the actual aperture position of the aperture. That is, the third current is a dynamic current.
  • the "dynamic current” involved can be understood as that during a certain process of switching the aperture position, the magnitude of the current input to the motor is not always constant, that is, the magnitude of the current will change. .
  • the magnitude of the current may vary according to the magnitude of the deviation between the target aperture position of the aperture and the actual aperture position of the aperture. Because during a certain switching of the aperture position, as the blades move, the size of the deviation between the target aperture position of the aperture and the actual aperture position of the aperture will change, so the size of the current used to drive the motor movement will change accordingly. changes occur. It can be understood that this does not limit the changing trend of the current input to the motor during the process of switching the aperture position multiple times. For example, in the two processes in which the motor drives the blade to move with dynamic current to achieve aperture position switching, the current input to the motor may change from large to small for each aperture position switching process.
  • the aperture when the deviation between the actual aperture position of the aperture and the target aperture position is less than a preset threshold, the aperture is considered to be at the third target position.
  • the target aperture position of the aperture when the target aperture position of the aperture is the maximum aperture position or the minimum aperture position, a combination of open-loop control and mechanical limit is used to achieve switching of the aperture position.
  • closed-loop control is used to switch the aperture position.
  • open-loop control can avoid the relative position deviation between the Hall element and the magnet in the direction of the optical axis (that is, the axis direction of the light entrance hole).
  • the impact of changes on aperture position control can improve the accuracy and stability of aperture position control.
  • a mechanical limit is used to limit the position of the blade, so that the first constant current or the second constant current can be larger, which can increase the speed of blade movement, thereby improving the speed of aperture position control.
  • steps S420, S430 and S440 are parallel optional steps. After the target aperture position in step S410 is determined, the corresponding one of steps S420, S430 and S440 is The steps are executed.
  • the motor includes a magnet and a coil.
  • One of the magnet and the coil is a stator, and the other is a mover.
  • the mover is used to drive the blade to move to change the aperture of the light entrance hole.
  • the first constant current is used to input into the coil to provide a first magnetic force for driving the mover to rotate around the axis of the aperture.
  • the second constant current is used to input into the coil to provide a second magnetic force for driving the mover to rotate around the axis of the aperture, wherein the first magnetic force is related to the second The direction of magnetic force is opposite.
  • the direction in which the first constant current is input into the coil to drive the mover to rotate is opposite to the direction in which the second constant current is input into the coil to drive the mover to rotate.
  • the aperture can be switched to the maximum aperture position or the minimum aperture within a certain drive current range. Location.
  • the first magnetic force and the second magnetic force are both tangent to the radial direction of the mover, and the radial direction of the mover is perpendicular to the axis of the light entrance hole.
  • the mover When the motor is at rest, the mover will experience friction. Therefore, if the mover is driven to rotate around the axis of the light hole to drive the blades, the magnetic force generated by the current input to the coil should at least overcome the friction experienced by the mover. force.
  • the first constant current and the second constant current may be the same or different.
  • the controller can reduce the current of the drive motor to keep the aperture at the target aperture position, which can reduce power consumption.
  • the fourth constant current and the fifth constant current may be the same or different.
  • the preset scene is a scene in which the aperture blades are easily damaged.
  • the preset scene includes at least one of the following scenes: a beating scene, a swinging scene, and a falling scene.
  • the controller can control the motor to drive the blade movement with a constant current to form a light entrance hole with a maximum aperture value.
  • This process is similar to the process in which the controller controls the aperture to switch to the first target position.
  • the constant current and the first constant current may be the same or different.
  • the aperture before the motor is powered off, no matter what aperture position the aperture is in, the aperture is switched to the position with the largest aperture. In this way, the aperture blades are in a contracted state, which can protect the blades and reduce the possibility of damage to the blades.
  • method 400 may further include: after the motor is powered off, when the aperture is in a preset scene, the controller controls the motor to power on, and controls the motor to drive the blade movement to form a light entrance hole with a maximum aperture value, The blades are fixed by a locking mechanism, and the stress the aperture receives in the preset scene is greater than or equal to the preset value.
  • the controller can control the motor to power on again and switch the aperture to the position with the largest aperture. In this way, the aperture blades are in a contracted state, which can protect the blades and reduce the possibility of damage to the blades.
  • 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.
  • the blades in the variable aperture are made of fragile materials. They are easily damaged by external forces under severe stress conditions such as falling, beating, and swinging. In view of this, embodiments of the present application also provide an aperture control method that can solve the problem of protecting the variable aperture blades.
  • An embodiment of the present application provides an aperture control method that is applied to an aperture assembly.
  • the aperture assembly includes a controller, a motor, and a blade.
  • the controller is used to control the motor to drive the movement of the blades to form light entrance holes with multiple apertures.
  • the method includes: when the aperture is in a preset scene, the controller controls the motor to drive the movement of the blade to form a light entrance hole with a maximum aperture value, wherein the blade is fixed by a locking mechanism, and the stress the aperture receives in the preset scene is greater than or equal to default value.
  • FIG. 10 shows a schematic diagram of the variable aperture 300 in the maximum aperture position.
  • the blades 320 are in a retracted state and are covered by the upper cover 310 .
  • the upper cover 310 plays a role in protecting the blades 320 .
  • the controller when the aperture is under great stress, no matter what aperture position the aperture is in, the controller switches the aperture to the maximum aperture position, and uses a locking mechanism to fix the blades. In this way, the aperture blades are in a contracted state, which can reduce the possibility of damage to the blades.
  • the locking mechanism involved in the embodiment of the present application can directly fix the position of the aperture blade.
  • the position of the aperture motor mover may also be fixed to fix the position of the blades, which is not specifically limited in the embodiments of the present application.
  • the locking mechanism can adopt any structure that can fix the position of the blade, such as a ratchet and pawl mechanism.
  • the controller can perform open-loop control so that the motor drives the blade to move with a first constant current.
  • the controller can first control the motor to power on, and then perform open-loop control so that the motor drives the blade to move with a first constant current.
  • whether the aperture is in a preset scene may be determined based on gyroscope signals and/or acceleration signals.
  • Figure 11 shows a schematic flow chart of an aperture control method provided by an embodiment of the present application.
  • the variable aperture includes four gears Z1, Z2, Z3, and Z4 as an example.
  • the aperture values of the four gears are F/4.0, F/2.8, F2.0, F1.4, where the Z1 gear has the minimum aperture value and the Z4 gear has the maximum aperture value.
  • this application does not specifically limit the number of gears included in the variable aperture and the aperture value of each gear. This is only an exemplary description.
  • the motor needs to control different aperture gears to meet different shooting scenarios.
  • open-loop control combined with mechanical limit can be used to switch the aperture position to Z1.
  • the controller can open-loop control the motor to drive the blade to move with a first constant current until the blade is fixed at the Z1 gear through the first limiting part.
  • the aperture sensitivity value is large and the position changes sensitively. The positions of the Hall element and the magnet will be affected by the gap along the axis of the light entrance hole. If closed-loop control is used, the feedback value will be inaccurate. . Therefore, the process of adjusting the aperture to the Z1 gear should not use closed-loop control but open-loop control. Since there is no feedback information in open-loop control, a mechanical limit is used to stop the motor or blade from continuing to move to fix the position of the blade, thereby achieving accurate, fast and stable aperture gear control.
  • open-loop control combined with mechanical limit can be used to switch the aperture position to Z4.
  • the controller may open-loop control the motor to drive the blade to move with a second constant current until the blade is fixed at the Z4 gear through the second limiting part. Since there is no feedback information in open-loop control, a mechanical limit is used to stop the motor or blade from continuing to move to fix the position of the blade, thereby achieving accurate, fast and stable aperture gear control.
  • switch from Z1 gear to Z2 gear, or switch from Z2 gear to Z1 gear, or switch from Z3 gear to Z4 gear, or switch from Z4 gear to Z3 gear. need to perform open-loop control and closed-loop Ring controlled switching.
  • the aperture can be accurately and quickly switched to the target position through closed-loop control.
  • the target position is Z1 or Z4
  • the aperture can be quickly and accurately switched to the target position based on open-loop control and the mechanical limit is used to fix the blade.
  • the switching time between closed-loop control and open-loop control is within 10 ms.
  • the method of open and closed loop control combined with mechanical limit can be used to switch a variety of aperture gears, which can solve problems such as inaccurate feedback of the Hall element and insensitive position of some apertures caused by many aperture gears.
  • the purpose of arbitrarily switching multiple aperture gears is achieved.
  • the open-loop control combined with the mechanical limit strategy improves the accuracy of open-loop control.
  • the motor of the variable aperture is powered on, that is, the camera module using the variable aperture is powered on.
  • the emergency protection scene is entered.
  • open-loop control combined with mechanical limit is used to switch the aperture position to the Z4 position, so that the aperture blades are in a retracted protection state.
  • the aperture is subject to greater stress in scenes such as being slapped, dropped, and shaken.
  • the aperture is subject to large stress, which can be understood to mean that the stress on the aperture is greater than or equal to the preset value.
  • it can be determined whether the aperture is in a large stress scene through the gyroscope signal and/or the acceleration signal.
  • the angular velocity of the aperture component is greater than or equal to a first preset threshold, and/or the acceleration of the aperture component is greater than or equal to a second preset threshold, it can be determined that the aperture is in a large stress scene, but embodiments of the present application are not limited thereto.
  • the controller can control the aperture to be set to the Z4 gear to lock the blades. In the retracted state, the possibility of damage to the diaphragm blades can be reduced.
  • the aperture position is switched to Z4, so that the aperture The leaves are in a shrinking protection state.
  • the position of the aperture blades can be fixed through friction and magnetic attraction between the magnetic conductive sheet and the magnet. Therefore, as shown in Figure 11, in the power-off scene, the aperture position defaults to Z4.
  • the aperture is set to the Z4 position before the motor is powered off, and the blades are locked in a retracted state, which can protect the blades from minimal external force and reduce the possibility of damage to the variable aperture blades.
  • a power-off scenario if it is detected that the aperture is subject to large stress, the motor is powered on and the emergency protection scenario is entered.
  • the emergency protection scenario no matter what position the aperture is in, open-loop control combined with mechanical limit is used to switch the aperture position to the Z4 position, so that the aperture blades are in a retracted protection state.
  • it can be determined whether the aperture is in a large stress scene through the gyroscope signal and acceleration signal.
  • the protection mechanism for the blades will be triggered, that is, the aperture position will be switched to the Z4 position, which can reduce the possibility of damage to the blades.
  • Figure 12 shows a schematic flow chart of open-loop control and closed-loop control provided by the embodiment of the present application.
  • the controller can control the motor to drive the blade movement with a constant current to switch the aperture to the target aperture position.
  • the Hall element can detect the actual aperture position of the aperture and feed it back to the controller. The controller adjusts the driving current in real time based on the deviation between the target aperture position and the actual aperture position to switch the aperture to the target aperture position. .
  • An embodiment of the present application provides an aperture controller configured to perform the foregoing aperture control method.
  • Embodiments of the present application provide an aperture assembly, including a controller, a motor and blades.
  • the controller is used to control the movement of the motor to drive the blades to form light entrance holes with multiple apertures, and the controller is used to perform the aforementioned aperture control method.
  • Embodiments of the present application provide a computer-readable storage medium that includes computer instructions.
  • the computer instructions When the computer instructions are run on an electronic device, the electronic device causes the electronic device to execute the aforementioned aperture control method.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

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Abstract

Un procédé de commande d'ouverture (400), un dispositif de commande d'ouverture, un module de caméra (103, 200) et un dispositif électronique (100). Le procédé de commande d'ouverture (400) est appliqué à un ensemble ouverture (210). L'ensemble ouverture (210) comprend un dispositif de commande, un moteur et des pales (320). Le dispositif de commande est utilisé pour commander le moteur pour qu'il entraîne les pales (320) à se déplacer de façon à former des trous d'incidence de lumière ayant divers diamètres. Le procédé de commande d'ouverture (400) comprend les étapes suivantes : le dispositif de commande acquiert une position de diamètre cible d'une ouverture (S410); lorsque le trou d'incidence de lumière situé à la position de diamètre cible a une valeur de diamètre maximale ou une valeur de diamètre minimale, le dispositif de commande commande le moteur pour qu'il entraîne, avec un courant constant, les pales (320) à se déplacer jusqu'à ce que les pales (320) soient fixées au niveau de la position de diamètre cible au moyen de parties de limitation (S420, S430); et lorsque le trou d'incidence de lumière situé au niveau de la position de diamètre cible est supérieur à la valeur de diamètre minimale et inférieur à la valeur de diamètre maximale, le dispositif de commande commande le moteur en fonction d'un écart entre une position de diamètre réelle et la position de diamètre cible de l'ouverture pour qu'il entraîne, avec un courant dynamique, les pales (320) à se déplacer vers la position de diamètre cible (S440). La politique de commande de position d'ouverture peut obtenir des images présentant une bonne qualité de prise de vues dans différents scénarios de prise de vues.
PCT/CN2023/099821 2022-06-24 2023-06-13 Procédé de commande d'ouverture, dispositif de commande d'ouverture, module de caméra et dispositif électronique WO2023246556A1 (fr)

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