Variable aperture assembly and image pickup apparatus
By designing different capacitor structures in the variable aperture assembly and detecting the difference in capacitance values to improve the accuracy of the fan blade rotation angle, the problem of insufficient aperture aperture detection accuracy is solved, and higher control accuracy and robustness are achieved.
Patent Information
- Application Number
- CN202423225384.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The existing camera module has insufficient aperture opening diameter detection accuracy, and the detection method occupies space and is susceptible to magnetic field interference, which affects control accuracy.
A variable aperture assembly is used. The first receiving plate is designed to face the first part and the second part to form a first capacitor, and the second receiving plate is designed to face the other part of the first part and the second part to form a second capacitor. When the emitting plate rotates with the fan blade, the capacitance value changes differently. The processor detects the difference in capacitance value to improve the accuracy of the fan blade rotation angle.
It improves the detection accuracy and control sensitivity of the fan blade rotation angle, reduces space occupation and magnetic field interference, and enhances the robustness of the capacitor signal.
Smart Images
Figure CN223551994U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of camera technology, and in particular to a variable aperture component and camera device. Background Technology
[0002] As people's demand for video recording in their daily lives continues to increase, the size of camera modules installed on portable devices such as smartphones and tablets is getting smaller and smaller, and the demand for improving the shooting quality of camera equipment is also gradually increasing.
[0003] The amount of light entering the camera module affects the image quality. By adjusting the size of the aperture opening, the amount of light entering the camera module can be adjusted, resulting in different brightness and depth of field. When the aperture opening is larger, the camera module has a larger amount of light entering, resulting in a brighter image with a better background blur effect. When the aperture opening is smaller, the camera module has a smaller amount of light entering, resulting in a clearer image with finer details.
[0004] In related technologies, Hall effect detection is commonly used to measure the amount of light entering a camera module. A detection magnet is placed within the camera module, and the Hall effect detects changes in the magnetic field to control the size of the aperture opening. However, this detection method requires a detection magnet within the camera module, occupying internal space. Furthermore, the motor installed in the camera module generates magnetic field interference, affecting detection accuracy and consequently impacting the control of the aperture opening size. Utility Model Content
[0005] This application provides a variable aperture component and a camera device, which at least helps to improve the accuracy of detecting the rotation angle of the fan blades.
[0006] According to some embodiments of this application, one aspect of this application provides a variable aperture assembly, including: a base having a through hole for accommodating a lens; a plurality of fan blades circumferentially spaced around the through hole, with one end of each fan blade rotatably connected to the base, the plurality of fan blades forming an aperture facing the through hole; at least one emitting electrode plate fixed to the side of the fan blades facing the base, the emitting electrode plate including a first part and a second part arranged circumferentially along the through hole; and at least one set of receiving electrode plates located below the emitting electrode plate, the set of receiving electrode plates including... The device includes a first receiving electrode and a second receiving electrode spaced apart from each other. The first receiving electrode faces one of the first part and the second part to form a first capacitor, and the second receiving electrode faces the other of the first part and the second part to form a second capacitor. As the transmitting electrode rotates with the fan blade, the capacitance value of one of the first capacitor and the second capacitor gradually increases, and the capacitance value of the other gradually decreases. The processor is configured to acquire the difference between the capacitance values of the first capacitor and the second capacitor during the rotation of the fan blade, and detect the angle of rotation of the fan blade based on the difference in capacitance values.
[0007] In some embodiments, a plurality of emitting electrodes are circumferentially spaced around the through hole, and the plurality of emitting electrodes are electrically connected to each other; each emitting electrode corresponds to a group of receiving electrodes, and multiple groups of receiving electrodes are circumferentially spaced around the through hole, the first receiving electrodes in the multiple groups of receiving electrodes are electrically connected to each other, and the second receiving electrodes in the multiple groups of receiving electrodes are electrically connected to each other.
[0008] In some embodiments, two sets of receiving electrode groups that are adjacent to each other along the circumferential direction of the through hole are respectively a first set of receiving electrode groups and a second set of receiving electrode groups. The emitting electrode group that is directly opposite the first set of receiving electrode groups is a first emitting electrode group, and the emitting electrode group that is directly opposite the second set of receiving electrode groups is a second emitting electrode group. In this embodiment, along the circumferential direction of the through hole, the first portion of the first emitting electrode group is adjacent to the first portion of the second emitting electrode group.
[0009] In some embodiments, along the circumferential direction of the through hole, the first set of receiving electrode groups and the second set of receiving electrode groups are mirror-symmetrical about the axis of symmetry, and the first emitting electrode and the second emitting electrode are mirror-symmetrical about the axis of symmetry.
[0010] In some embodiments, the two sets of receiving electrode groups that are adjacent to each other along the circumferential direction of the through hole are respectively a first set of receiving electrode groups and a second set of receiving electrode groups, the emitting electrode group directly opposite the first set of receiving electrode groups is a first emitting electrode group, and the emitting electrode group directly opposite the second set of receiving electrode groups is a second emitting electrode group; wherein, along the circumferential direction of the through hole, the second part of the first emitting electrode group is adjacent to the first part of the second emitting electrode group.
[0011] In some embodiments, the width of the emitting electrode plate gradually increases in the circumferential direction of the through hole and in the axial direction of the through hole, and the maximum value of the width of the first part is less than the minimum value of the width of the second part.
[0012] In some embodiments, the orthographic projection shapes of the first receiving electrode and the second receiving electrode on the reference plane are both fan-shaped rings, and the reference plane is perpendicular to the direction from the first receiving electrode to the transmitting electrode.
[0013] In some embodiments, along the axial direction of the through hole, the width of the first receiving electrode is greater than the maximum width of the emitting electrode, and the width of the second receiving electrode is greater than the maximum width of the emitting electrode.
[0014] In some embodiments, the processor is further configured to store the difference between the capacitance values of the first capacitor and the second capacitor, and after detecting the angle of rotation of the fan blade based on the difference in capacitance values, adjust the angle of rotation of the fan blade based on the difference in capacitance values.
[0015] According to some embodiments of this application, another aspect of this application provides a camera device, including: a lens; and a variable aperture component as described in any of the preceding claims, for controlling the aperture of the lens.
[0016] The technical solution provided in this application has at least the following advantages:
[0017] The design involves a first receiving plate facing one of the first and second parts to form a first capacitor, and a second receiving plate facing the other of the first and second parts to form a second capacitor. As the transmitting plate rotates with the fan blades, the capacitance of one of the first and second capacitors gradually increases, while the capacitance of the other gradually decreases. This design ensures that the capacitance changes of the two capacitors formed by the transmitting plate and the first and second receiving plates exhibit different trends. The difference between the two capacitance values is calculated, and the processor performs differential processing on this difference. After differential processing, the difference can be amplified to increase the robustness of the capacitance signal received by the processor, thereby improving the accuracy of detecting the fan blade rotation angle and making the control of the fan blade rotation more sensitive. Attached Figure Description
[0018] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a partial exploded view of a variable aperture assembly provided in an embodiment of this application;
[0020] Figure 2 This is a first top view of the emitter electrode and receiver electrode assembly in a variable aperture assembly provided in an embodiment of this application;
[0021] Figure 3 A second top view schematic diagram of the emitter electrode and receiver electrode assembly in a variable aperture assembly provided in an embodiment of this application;
[0022] Figure 4 A third top view of the emitter electrode and receiver electrode assembly in a variable aperture assembly provided in an embodiment of this application;
[0023] Figure 5 A fourth top view of the emitter electrode and receiver electrode assembly in a variable aperture assembly provided in an embodiment of this application;
[0024] Figure 6 A partial top view of a variable aperture assembly provided in an embodiment of this application, showing the fan blades rotating counterclockwise by (AB)°.
[0025] Figure 7 This is a simulation result of the capacitance of the fan blades rotating counterclockwise (AB)° in a variable aperture assembly provided in an embodiment of this application;
[0026] Figure 8 This is a schematic diagram of the fan blade movement and aperture opening diameter change in a camera device provided in another embodiment of this application. Detailed Implementation
[0027] As can be seen from the background technology, the detection accuracy of aperture opening diameter needs to be improved.
[0028] This application provides a variable aperture assembly and a camera device. In the variable aperture assembly, a first receiving plate is designed to face one of the first and second parts to form a first capacitor, and a second receiving plate is designed to face the other of the first and second parts to form a second capacitor. As the emitting plate rotates with the fan blades, the capacitance value of one of the first and second capacitors gradually increases, while the capacitance value of the other gradually decreases. This allows the capacitance values of the two capacitors formed by the emitting plate and the first and second receiving plates to change with different trends. The difference between the capacitance values of the two capacitors is calculated, and the processor performs differential processing on this difference. After differential processing, the difference in capacitance values can be amplified to increase the robustness of the capacitance signal received by the processor, thereby improving the accuracy of detecting the fan blade rotation angle and making the control of the fan blade rotation more sensitive.
[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0031] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.
[0032] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0033] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0035] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.
[0036] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or it can have another component present in between. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located in between.
[0037] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.
[0038] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the embodiments. However, the technical solutions claimed in the embodiments of this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.
[0039] One embodiment of this application provides a variable aperture component, which will be described in detail below with reference to the accompanying drawings.
[0040] Reference Figures 1 to 3 The variable aperture assembly includes: a base having a through-hole 101 for accommodating a lens; a plurality of fan blades 102 circumferentially spaced around the through-hole 101, with one end of each fan blade 102 rotatably connected to the base, the plurality of fan blades 102 forming an aperture facing the through-hole 101; at least one emitting electrode 103 fixed to the side of the fan blades 102 facing the base, the emitting electrode 103 including a first portion 113 and a second portion 123 arranged circumferentially along the through-hole 101; and at least one set of receiving electrode groups 104 located below the emitting electrode 103, the set of receiving electrode groups 104 including spaced apart from each other. The first receiving plate 114 and the second receiving plate 124 are arranged such that the first receiving plate 114 is directly opposite to one of the first part 113 and the second part 123 to form a first capacitor, and the second receiving plate 124 is directly opposite to the other of the first part 113 and the second part 123 to form a second capacitor; when the transmitting plate 103 rotates with the fan blade 102, the capacitance value of one of the first capacitor and the second capacitor gradually increases, and the capacitance value of the other gradually decreases; the processor 105 is configured to acquire the difference between the capacitance values of the first capacitor and the second capacitor during the rotation of the fan blade 102, and detect the rotation angle of the fan blade 102 based on the difference in capacitance values.
[0041] in, Figure 1 This is a partial exploded view of a variable aperture assembly provided in an embodiment of this application; Figure 2 This is a first top view of the emitter electrode and receiver electrode assembly in a variable aperture assembly provided in an embodiment of this application; Figure 3This is a second top view schematic diagram of the emitter and receiver electrode groups in a variable aperture assembly provided in an embodiment of this application. It should be noted that the diagram is designed to illustrate the first portion 113 and the second portion 123 of the emitter electrode 103. Figure 3 The first part 113 and the second part 123, which are respectively opposite to different first receiving plates 114, are outlined with solid lines, and the first part 113 and the second part 123, which are respectively opposite to different second receiving plates 124, are outlined with dashed lines.
[0042] It is worth noting that the emitting electrode 103 is fixed on the fan blade 102. The rotation of the fan blade 102 drives the emitting electrode 103 to move, thereby causing a change in the facing area between the emitting electrode 103 and a set of receiving electrode groups 104. This causes a change in the capacitance between the emitting electrode 103 and the first receiving electrode 114 and the second receiving electrode 124, so that the capacitance value of one of the first capacitor and the second capacitor gradually increases and the capacitance value of the other gradually decreases. Thus, the angle of rotation of the fan blade 102 can be detected by detecting the difference in capacitance values.
[0043] The capacitance between the emitting plate 103 and the first receiving plate 114, and the capacitance between the emitting plate 103 and the second receiving plate 124, both satisfy the following relationship: C=εS / 4πkd.
[0044] Where ε is the dielectric constant of the medium; k is the electrostatic constant; S is the area of the face-to-face region between the emitting electrode 103 and the first receiving electrode 114, or between the emitting electrode 103 and the second receiving electrode 124; and d is the vertical distance between the emitting electrode 103 and the first receiving electrode 114, or between the emitting electrode 103 and the second receiving electrode 124. From the above equations, it can be seen that for the first capacitor formed by the emitting electrode 103 and the first receiving electrode 114, and the second capacitor formed by the emitting electrode 103 and the second receiving electrode 124, while keeping the dielectric constant constant, changing the area of the face-to-face region between the emitting electrode 103 and the first receiving electrode 114 and the second receiving electrode 124, or the vertical distance between the emitting electrode 103 and the first receiving electrode 114 and the second receiving electrode 124, will cause a change in the capacitance values of the first and second capacitors.
[0045] It should be noted that the area directly opposite the emitting electrode 103 and the first receiving electrode 114 refers to the overlapping area of their orthographic projections onto the reference plane; the area directly opposite the emitting electrode 103 and the second receiving electrode 124 refers to the overlapping area of their orthographic projections onto the reference plane. The reference plane is perpendicular to the direction from the first receiving electrode 114 to the emitting electrode 103.
[0046] In some cases, the reference surface can be the surface of the base facing the fan blade 102.
[0047] It is worth emphasizing that the first receiving plate 114 is designed to face one of the first part 113 and the second part 123 to form a first capacitor, and the second receiving plate 124 is designed to face the other of the first part 113 and the second part 123 to form a second capacitor. Furthermore, as the transmitting plate 103 rotates with the fan blade 102, the capacitance value of one of the first and second capacitors gradually increases, while the capacitance value of the other gradually decreases. This design allows the capacitance values of the two capacitors formed by the transmitting plate 103 and the first and second receiving plates 114 to exhibit different trends. The difference between the two capacitance values is calculated, and the processor performs differential processing on this difference. After differential processing, the difference can be amplified to increase the robustness of the capacitance signal received by the processor, thereby improving the accuracy of the detected fan blade rotation angle and making the control of fan blade rotation more sensitive.
[0048] The embodiments of this application will be described in more detail below with reference to the accompanying drawings.
[0049] In some embodiments, reference Figures 1 to 3 Multiple emitting electrodes 103 are circumferentially spaced around the through hole 101 and are electrically connected to each other. Each emitting electrode 103 corresponds to a set of receiving electrode groups 104. Multiple sets of receiving electrode groups 104 are circumferentially spaced around the through hole 101. The first receiving electrode groups 114 and the second receiving electrode groups 124 are electrically connected to each other. In other words, the potentials on the multiple emitting electrodes 103 are the same, the potentials on the multiple first receiving electrode groups 114 are the same, and the potentials on the multiple second receiving electrode groups 124 are the same. Thus, the capacitance between the emitting electrode 103 and the first receiving electrode group 114 and the second receiving electrode group 124 is mainly determined by the facing area between the emitting electrode 103 and the first receiving electrode group 114 and the second receiving electrode group 124.
[0050] It is worth noting that for any given emitting electrode 103, it is directly opposite to a set of receiving electrode groups 104. In other words, the orthographic projections of the emitting electrode 103 and the set of receiving electrode groups 104 on the reference plane overlap. Thus, when the emitting electrode 103 rotates with the fan blade 102, the shape of the emitting electrode 103 itself does not change. The area between the emitting electrode 103 and the first receiving electrode 114 in the receiving electrode group 104 increases, and the area between the emitting electrode 103 and the second receiving electrode 124 in the receiving electrode group 104 also increases, and vice versa.
[0051] It should be noted that, Figures 1 to 3This example only uses a variable aperture assembly containing two emitting electrode plates 103 and two sets of receiving electrode plates 104 as an example. In practical applications, this embodiment does not limit the number of emitting electrode plates 103 or the number of sets of receiving electrode plates 104 in the variable aperture assembly, as long as each emitting electrode plate 103 corresponds to one set of receiving electrode plates 104, so that each emitting electrode plate 103 and the receiving electrode plate set 104 can respectively form a first capacitor and a second capacitor. Moreover, if multiple sets of receiving electrode plates 104 are arranged circumferentially around the through hole 101, then the first receiving electrode plate 114 of one set of two adjacent sets of receiving electrode plates 104 and the second receiving electrode plate 124 of the other set are adjacent.
[0052] Furthermore, the first portion 113 and the second portion 123 of the emitting electrode 103 vary based on the rotation of the emitting electrode 103. For example, for a single emitting electrode 103, during the rotation of the emitting electrode 103, the portion of the emitting electrode 103 facing the first receiving electrode 114 can be considered the second portion 123, and the portion of the emitting electrode 103 facing the second receiving electrode 124 can be considered the first portion 113. In other examples, the portion of the emitting electrode facing the first receiving electrode can also be considered the second portion, and the portion of the emitting electrode facing the second receiving electrode can also be considered the first portion.
[0053] In some embodiments, reference Figure 3 The transmitting electrode 103 also includes a connecting portion 133 connecting the first portion 113 and the second portion 123. It is worth noting that there is a gap between the first receiving electrode 114 and the second receiving electrode 124 in the receiving electrode group 104. When the transmitting electrode 103 is facing the receiving electrode group 104, in addition to having the first portion 113 and the second portion 123 that are respectively facing the first receiving electrode 114 and the second receiving electrode 124, it also has a connecting portion 133 that is directly opposite the gap between the first receiving electrode 114 and the second receiving electrode 124.
[0054] It should be noted that the emitting electrode 103 can be a complete component. The division of its first part 113, second part 123 and connecting part 133 is based on the fact that different areas of the emitting electrode 103 and the receiving electrode group 104 are facing each other. Therefore, as the emitting electrode 103 rotates, the first part 113, the second part 123 and the connecting part 133 all change.
[0055] In one example, along the circumference of the through hole 101, the circumferential length of the emitting electrode 103 can be greater than the circumferential length of both the first receiving electrode 114 and the second receiving electrode 124. In other examples, along the circumferential direction of the through hole, the circumferential length of the emitting electrode can be less than the circumferential length of the first receiving electrode, resulting in a situation where the emitting electrode is completely aligned with the first receiving electrode. In this case, either the connecting portion or either the first or second portion can be considered zero. Alternatively, the circumferential length of the emitting electrode can be less than the circumferential length of the second receiving electrode, resulting in a situation where the emitting electrode is completely aligned with the second receiving electrode. In this case, either the connecting portion or either the first or second portion can be considered zero.
[0056] The transmitting electrode 103 and the receiving electrode assembly 104 are described in detail below.
[0057] In some embodiments, in conjunction with reference Figure 3 and Figure 4 , Figure 4 This is a third top view of the emitter electrode and receiver electrode group in a variable aperture assembly provided in an embodiment of this application. The two receiver electrode groups 104 that are adjacent to each other along the circumference of the through hole 101 are the first receiver electrode group 104a and the second receiver electrode group 104b, respectively. The emitter electrode 103 that is directly opposite to the first receiver electrode group 104a is the first emitter electrode 103a, and the emitter electrode 103 that is directly opposite to the second receiver electrode group 104b is the second emitter electrode 103b. In the circumference of the through hole 101, the first part 113 of the first emitter electrode 103a is adjacent to the first part 113 of the second emitter electrode 103b.
[0058] In one example, referring to the reference Figure 3 and Figure 4 The second part 123 of the first transmitting electrode 103a is directly opposite to the first receiving electrode 114 of the first receiving electrode group 104a. The first part 113 of the first transmitting electrode 103a is directly opposite to the second receiving electrode 124 of the first receiving electrode group 104a. The first part 113 of the second transmitting electrode 103b is directly opposite to the first receiving electrode 114 of the second receiving electrode group 104b. The second part 123 of the second transmitting electrode 103b is directly opposite to the second receiving electrode 124 of the second receiving electrode group 104b. Therefore, along the circumferential direction of the through hole 101, the first part 113 of the first transmitting electrode 103a is adjacent to the first part 113 of the second transmitting electrode 103b, and the second receiving electrode 124 of the first receiving electrode group 104a and the first receiving electrode 114 of the second receiving electrode group 104b are also adjacent to each other.
[0059] Thus, fan blade 102 (reference) Figure 1During the counterclockwise rotation around the rotation center point O, the emitting electrode 103 moves counterclockwise relative to a set of receiving electrode groups 104. The second part 123 of the first emitting electrode 103a and the first receiving electrode 114 of the first set of receiving electrode groups 104a form a capacitor C11, and the area between them increases. The first part 113 of the second emitting electrode 103b and the first receiving electrode 114 of the second set of receiving electrode groups 104b form a capacitor C23, and the area between them also increases. Therefore, the capacitance (C11+C23) also increases. At the same time, the first part 113 of the first transmitting electrode 103a and the second receiving electrode 124 of the first receiving electrode group 104a form a capacitor C12, and the area between them decreases. The second part 123 of the second transmitting electrode 103b and the second receiving electrode 124 of the second receiving electrode group 104b form a capacitor C24, and the area between them also decreases. Thus, the capacitance (C12+C24) also decreases, thereby increasing the capacitance (C11+C23) and decreasing the capacitance (C12+C24).
[0060] In some cases, continue to refer to Figure 4 Along through hole 101 (reference) Figure 2 In the circumferential direction, the first set of receiving electrode groups 104a and the second set of receiving electrode groups 104b are mirror-symmetrical along the axis of symmetry S, and the first transmitting electrode 103a and the second transmitting electrode 103b are mirror-symmetrical along the axis of symmetry S. Thus, the orthographic projection shapes of the first receiving electrode 114 and the second receiving electrode 124 in any set of receiving electrode groups 104 on the reference plane are the same; in other words, the first receiving electrode 114 and the second receiving electrode 124 are components of the same size.
[0061] In other embodiments, reference is made to Figure 5 , Figure 5 This is a fourth top view of the emitter electrode and receiver electrode group in a variable aperture assembly provided in an embodiment of this application. The two receiver electrode groups 104 that are adjacent to each other along the circumference of the through hole 101 are the first receiver electrode group 104a and the second receiver electrode group 104b, respectively. The emitter electrode 103 that is directly opposite to the first receiver electrode group 104a is the first emitter electrode 103a, and the emitter electrode 103 that is directly opposite to the second receiver electrode group 104b is the second emitter electrode 103b. In the circumference of the through hole 101, the second part 123 of the first emitter electrode 103a is adjacent to the first part 113 of the second emitter electrode 103b.
[0062] It should be noted that, Figure 5 The first part 113 and the second part 123 of the emitting electrode 103 are divided by dashed lines.
[0063] In one example, continue to refer to Figure 5The first part 113 of the first transmitting electrode 103a is directly opposite to the first receiving electrode 114 of the first receiving electrode group 104a. The second part 123 of the first transmitting electrode 103a is directly opposite to the second receiving electrode 124 of the first receiving electrode group 104a. The first part 113 of the second transmitting electrode 103b is directly opposite to the first receiving electrode 114 of the second receiving electrode group 104b. The second part 123 of the second transmitting electrode 103b is directly opposite to the second receiving electrode 124 of the second receiving electrode group 104b. Therefore, along the circumferential direction of the through hole 101, the second part 123 of the first transmitting electrode 103a and the first part 113 of the second transmitting electrode 103b are adjacent. Thus, the second receiving electrode 124 of the first receiving electrode group 104a and the first receiving electrode 114 of the second receiving electrode group 104b are also adjacent.
[0064] In some cases, the orthographic projection shapes of the first receiving electrode 114 and the second receiving electrode 124 in any set of receiving electrode groups 104 on the reference plane can be the same; in other words, the first receiving electrode 114 and the second receiving electrode 124 can be components of the same size. In other examples, different first receiving electrodes in different sets of receiving electrode groups can be components of the same size, and different second receiving electrodes in different sets of receiving electrode groups can be components of the same size, but the first receiving electrode and the second receiving electrode can be components of different sizes.
[0065] In the various embodiments described above, reference is made to Figures 1 to 5 Along the circumferential direction of the through hole 101, the width of the emitting electrode 103 in the axial direction of the through hole 101 gradually increases, and the maximum value of the width of the first part 113 is less than the minimum value of the width of the second part 123.
[0066] On one hand, on the side of the fan blade 102 facing the base, in addition to fixing the emitting electrode plate 103, a spring-loaded structure is also installed to allow the fan blade 102 to spring back. Based on this, in order to avoid interference between the emitting electrode plate 103 and the spring-loaded structure when the emitting electrode plate 103 rotates with the fan blade 102, an emitting electrode plate 103 with a gradually changing width along the axial direction of the through hole 101 is used to avoid interference with the spring-loaded structure.
[0067] On the other hand, although the widths of the first part 113 and the second part 123 in the axial direction of the through hole 101 are gradually changing, the area change of the second part 123 is greater than the area change of the first part 113 within a unit angle of rotation of the emitting electrode plate 103 with the fan blade 102. Thus, the change in the area between the second part 123 and the receiving electrode plate group 104 is greater than the change in the area between the first part 113 and the receiving electrode plate group 104, resulting in unequal rates of change of the area of the first part 113 and the second part 123 within a unit rotation angle of the emitting electrode plate 103.
[0068] Based on this, refer to Figures 1 to 4 Along the circumferential direction of the through hole 101, the first part 113 of the first emitting electrode 103a is adjacent to the first part 113 of the second emitting electrode 103b, such that the second part 123 of the first emitting electrode 103a and the first part 113 of the second emitting electrode 103b are both directly opposite to different first receiving electrodes 114, and the different first receiving electrodes 114 are electrically connected to each other, so that capacitors C11 and C23 can be regarded as a group of capacitors, for example, the sum of multiple first capacitors; similarly, the first part 113 of the first emitting electrode 103a and the second part 1233 of the second emitting electrode 103b are both directly opposite to different second receiving electrodes 124, and the different second receiving electrodes 124 are electrically connected to each other, so that capacitors C12 and C24 can be regarded as another group of capacitors, for example, the sum of multiple second capacitors. Thus, each of the two sets of capacitors includes a first part 113 and a second part 123. When the emitter plate 103 rotates with the fan blade 102, the area of the first part 113 and the second part 123 in one set of capacitors increases, while the area of the first part 113 and the second part 123 in the other set of capacitors decreases.
[0069] For example, during the counterclockwise rotation of the fan blade 102 around the rotation center point O, the areas of the second part 123 of the first emitting electrode 103a and the first part 113 of the second emitting electrode 103b facing the first receiving electrode 114 both increase, and within a unit rotation angle, the increase in area of the second part 123 of the first emitting electrode 103a is greater than the increase in area of the first part 113 of the second emitting electrode 103b; the areas of the first part 113 of the first emitting electrode 103a and the second part 123 of the second emitting electrode 103b facing the first receiving electrode 114 both decrease, and within a unit rotation angle, the decrease in area of the second part 123 of the first emitting electrode 103a is greater than the decrease in area of the first part 113 of the second emitting electrode 103b.
[0070] In other words, by designing the first part 113 of the first emitting plate 103a and the first part 113 of the second emitting plate 103b to be adjacent, the two sets of capacitors, namely capacitors (C11+C23) and capacitors (C12+C24), can form a complementary structure. Each part 123 has a large area change rate, which is matched with a first part 113 with a small area change rate. The combined area change rates of the two parts avoid the situation of poor linearity of the width change of the emitting plate 103. This is beneficial to improving the linearity of the capacitance difference between capacitors (C11+C23) and capacitors (C12+C24) measured by the processor 105, without reducing the detection accuracy of the processor 105.
[0071] In some examples, the orthographic projection shape of the emitting electrode 103 onto the reference plane can be triangular, trapezoidal, triangular-like, or trapezoidal. In the case of a triangular-like or trapezoidal shape, one side near the center of the through-hole 101 is arc-shaped. The reference plane is perpendicular to the direction from the first receiving electrode 114 to the emitting electrode 103. It should be noted that... Figures 1 to 5 The example shown uses a trapezoidal shape as the orthographic projection of the emitting electrode 103 onto the base. In practical applications, the specific shape of the emitting electrode can be flexibly designed according to the specific dimensions of the spring structure located below the fan blades, so as to effectively avoid interference between the emitting electrode and the spring structure. Furthermore, the center of the through hole 101 is the rotation center point O.
[0072] In some embodiments, reference Figures 1 to 5 The orthographic projections of the first receiving electrode 114 and the second receiving electrode 124 onto the reference plane can both be fan-shaped rings, with the reference plane perpendicular to the direction from the first receiving electrode 114 to the emitting electrode 103. This helps to avoid the receiving electrode assembly 104 limiting the aperture of the aperture and prevents the receiving electrode assembly 104 from affecting the amount of light entering the variable aperture assembly.
[0073] In some embodiments, reference Figures 1 to 5 Along the axial direction of the through hole 101, the width of the first receiving electrode 114 can be greater than the maximum width of the transmitting electrode 103, and the width of the second receiving electrode 124 can be greater than the maximum width of the transmitting electrode 103.
[0074] In some embodiments, reference Figure 1 The processor 105 can also be configured to store the difference in capacitance values between the first capacitor and the second capacitor, and after detecting the rotation angle of the fan blade 102 based on the difference in capacitance values, adjust the rotation angle of the fan blade 102 based on the difference in capacitance values. This not only increases the robustness of the capacitance signal received by the processor based on the different trends in the capacitance values of the first and second capacitors, thereby improving the accuracy of the detected fan blade rotation angle, but also facilitates obtaining a good sensitivity and linear relationship between the rotation angle and capacitance. Furthermore, based on the detected difference in capacitance values, the subsequent rotation of the fan blade 102 can be more accurately controlled, thus achieving closed-loop control of the rotation angle of the fan blade 102, and ultimately controlling the amount of light entering the variable aperture assembly.
[0075] In some cases, refer to Figure 6 and Figure 7 , Figure 6 This is a partial top view of a variable aperture assembly provided in an embodiment of this application, showing the fan blades rotating counterclockwise by (AB)°. Figure 7This is a simulation result diagram of the capacitance when the fan blades rotate counterclockwise (AB)° in a variable aperture assembly provided in an embodiment of this application. Wherein, Figure 6 The initial position of the emitter plate 103 and the fan blade is A, and the final position is B. Based on the different capacitance trends of the first and second capacitors, the processor can obtain a good sensitivity and linear relationship between the rotation angle and the first and second capacitors, and realize closed-loop control of the rotation angle of the fan blade 102 based on the detected difference between the first and second capacitors. In one example, AB is 15°.
[0076] It should be noted that, Figure 7 This diagram illustrates the simulation results of the relationship between the rotation angle of the fan blades and the capacitance of the first and second capacitors as the emitting electrode rotates with the fan blades. The horizontal axis represents the rotation angle of one fan blade, and the vertical axis represents the capacitance values of the first and second capacitors. Figure 7 The first capacitor and the second capacitor are represented by a darker solid line, and the other capacitor is represented by a grayer solid line.
[0077] In summary, the design involves first receiving plate 114 facing one of the first part 113 and second part 123 to form a first capacitor, and second receiving plate 124 facing the other of the first part 113 and second part 123 to form a second capacitor. As the transmitting plate 103 rotates with the fan blade 102, the capacitance value of one of the first and second capacitors gradually increases, while the capacitance value of the other gradually decreases. This design allows the capacitance values of the two capacitors formed by the transmitting plate 103 and the first and second receiving plates 114 to exhibit different trends. The difference between the two capacitance values is calculated, and the processor performs differential processing on this difference. After differential processing, the difference can be amplified to increase the robustness of the capacitance signal received by the processor, thereby improving the accuracy of the detected fan blade rotation angle and making the control of fan blade rotation more sensitive.
[0078] Another embodiment of this application provides a camera device, including the variable aperture component provided in the foregoing embodiments. The camera device provided in another embodiment of this application will be described in detail below with reference to the accompanying drawings. It should be noted that parts that are the same as or corresponding to those in the foregoing embodiments will not be repeated here.
[0079] refer to Figure 8 , Figure 8This is a schematic diagram illustrating the movement of fan blades and the change in aperture opening diameter in a camera device according to another embodiment of this application. The camera device includes: a lens; and a variable aperture assembly provided in the aforementioned embodiment, used to control the aperture of the lens. Since multiple fan blades 102 are circumferentially spaced around a through-hole 101, and one end of each fan blade 102 is rotatably connected to a base 106, the multiple fan blades 102 form an aperture 107 directly opposite the through-hole 101. Therefore, the rotation angle of the fan blades 102 affects the amount of light entering the camera device, i.e., the aperture opening diameter of the aperture 107.
[0080] In summary, the design involves first receiving plate 114 facing one of the first part 113 and second part 123 to form a first capacitor, and second receiving plate 124 facing the other of the first part 113 and second part 123 to form a second capacitor. As the transmitting plate 103 rotates with the fan blade 102, the capacitance value of one of the first and second capacitors gradually increases, while the capacitance value of the other gradually decreases. This design allows the capacitance values of the two capacitors formed by the transmitting plate 103 and the first and second receiving plates 114 to exhibit different trends. The difference between the two capacitance values is calculated, and the processor performs differential processing on this difference. After differential processing, the difference can be amplified to increase the robustness of the capacitance signal received by the processor, thereby improving the accuracy of the detected fan blade rotation angle and making the control of fan blade rotation more sensitive.
[0081] Those skilled in the art will understand that the above-described embodiments are specific examples of implementing this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the embodiments of this application. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of this application; therefore, the scope of protection of the embodiments of this application should be determined by the scope defined in the claims.
Claims
1. A variable aperture assembly, characterized in that, include: A base having a through-hole for receiving a lens; Multiple fan blades are arranged circumferentially around the through hole, and one end of each fan blade is rotatably connected to the base. The multiple fan blades form an aperture that faces the through hole. At least one emitting electrode plate, the emitting electrode plate being fixed to the side of the fan blade facing the base, the emitting electrode plate comprising a first part and a second part arranged circumferentially along the through hole; At least one set of receiving plates located below the transmitting plate, the set of receiving plates including a first receiving plate and a second receiving plate spaced apart from each other, the first receiving plate facing one of the first part and the second part to form a first capacitor, and the second receiving plate facing the other of the first part and the second part to form a second capacitor. As the emitting plate rotates with the fan blade, the capacitance value of one of the first capacitor and the second capacitor gradually increases, while the capacitance value of the other capacitor gradually decreases. The processor is configured to acquire the difference in capacitance values between the first capacitor and the second capacitor during the rotation of the fan blade, and to detect the angle of rotation of the fan blade based on the difference in capacitance values.
2. The variable aperture assembly according to claim 1, characterized in that, The plurality of emitting electrodes are arranged circumferentially around the through hole, and the plurality of emitting electrodes are electrically connected to each other; Each of the transmitting electrode plates corresponds to a set of receiving electrode plates. Multiple sets of receiving electrode plates are arranged circumferentially around the through hole. The first receiving electrode plates in the multiple sets of receiving electrode plates are electrically connected to each other, and the second receiving electrode plates in the multiple sets of receiving electrode plates are electrically connected to each other.
3. The variable aperture assembly according to claim 2, characterized in that, The two sets of receiving electrode groups that are adjacent to each other along the circumference of the through hole are the first set of receiving electrode groups and the second set of receiving electrode groups, respectively. The transmitting electrode group that is directly opposite the first set of receiving electrode groups is the first transmitting electrode group, and the transmitting electrode group that is directly opposite the second set of receiving electrode groups is the second transmitting electrode group. Along the circumferential direction of the through hole, the first portion of the first emitting electrode plate is adjacent to the first portion of the second emitting electrode plate.
4. The variable aperture assembly according to claim 3, characterized in that, Along the circumference of the through hole, the first set of receiving electrode groups and the second set of receiving electrode groups are mirror-symmetrical about the axis of symmetry, and the first emitting electrode and the second emitting electrode are mirror-symmetrical about the axis of symmetry.
5. The variable aperture assembly according to claim 2, characterized in that, The two sets of receiving electrode groups that are adjacent to each other along the circumference of the through hole are the first set of receiving electrode groups and the second set of receiving electrode groups, respectively. The transmitting electrode group that is directly opposite the first set of receiving electrode groups is the first transmitting electrode group, and the transmitting electrode group that is directly opposite the second set of receiving electrode groups is the second transmitting electrode group. Along the circumferential direction of the through hole, the second part of the first emitting electrode plate is adjacent to the first part of the second emitting electrode plate.
6. The variable aperture assembly according to any one of claims 1 to 5, characterized in that, Along the circumferential direction of the through hole, the width of the emitting electrode plate gradually increases in the axial direction of the through hole, and the maximum value of the width of the first part is less than the minimum value of the width of the second part.
7. The variable aperture assembly according to any one of claims 1 to 5, characterized in that, The orthographic projections of the first receiving electrode and the second receiving electrode on the reference plane are both fan-shaped rings, and the reference plane is perpendicular to the direction from the first receiving electrode to the transmitting electrode.
8. The variable aperture assembly according to any one of claims 1 to 5, characterized in that, Along the axial direction of the through hole, the width of the first receiving electrode is greater than the maximum width of the transmitting electrode, and the width of the second receiving electrode is greater than the maximum width of the transmitting electrode.
9. The variable aperture assembly according to claim 1, characterized in that, The processor is also configured to store the difference between the capacitance values of the first capacitor and the second capacitor, and after detecting the angle of rotation of the fan blade based on the difference in capacitance values, adjust the angle of rotation of the fan blade based on the difference in capacitance values.
10. A camera device, characterized in that, include: Lens; a variable aperture assembly as described in any one of claims 1 to 9, for controlling the aperture of the lens.