Detection device and electronic device

Abstract

Embodiments of the present application provide a detection device and an electronic device, comprising an excitation magnetic field generator, a plurality of magnetic bistable micro wires and a magnetic field sensor; the plurality of magnetic bistable micro wires are adjacent to each other, and any two adjacent magnetic bistable micro wires have a gap therebetween, and the gap is less than or equal to 5 mm. Embodiments of the present application can improve the detection accuracy of the sensor, and are beneficial to improving the performance of the electronic device.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a detection device and electronic device. Background Technology

[0002] Sensors are widely used in various electronic devices. A sensor detects the measured information and converts it into an electrical signal or other form of information output. As the automation and intelligence of equipment continue to improve, the accuracy requirements for sensors are also increasing. However, conventional sensors cannot meet the ever-increasing demands for detection accuracy, thus limiting the performance improvement of electronic devices. Summary of the Invention

[0003] This application provides a detection device and an electronic device that can improve the detection accuracy of sensors and improve the performance of electronic devices.

[0004] In a first aspect, embodiments of this application provide a detection device, including an excitation magnetic field generator, multiple magnetic bistable microfilaments, and a magnetic field sensor; the excitation magnetic field generator is used to generate a changing magnetic field signal; the multiple magnetic bistable microfilaments are arranged adjacent to each other, and there is a gap between any two adjacent magnetic bistable microfilaments, the gap being less than or equal to 5 mm; the multiple magnetic bistable microfilaments are used to generate multiple pulse signals under the excitation of the changing magnetic field signal; the magnetic field sensor is used to receive the multiple pulse signals.

[0005] In this embodiment, the detection device can also be considered a sensor. By placing multiple magnetically bistable microfilaments (hereinafter referred to as microfilaments) in pairs with the gap between them controlled within the aforementioned range, coupling effects can be ensured between the microfilaments, resulting in the differentiation of hysteresis loops. This allows for the acquisition of pulse generation times from multiple sets of microfilaments in a single scan (i.e., increasing the sampling frequency), ultimately enabling the determination of the measured quantity (e.g., distance, temperature, pressure, magnetic field strength, etc.). Since the sampling frequency can be increased, detection accuracy can be improved. Moreover, this embodiment does not rely on increasing the scanning frequency as in conventional solutions, but rather increases the sampling frequency while maintaining a relatively low scanning frequency, thus avoiding the loss of detection accuracy caused by increasing the scanning frequency in conventional solutions.

[0006] In one implementation of the first aspect, an excitation magnetic field generator surrounds the outer periphery of multiple magnetically bistable microfilaments. By surrounding the excitation magnetic field generator with the outer periphery of the multiple magnetically bistable microfilaments, it is ensured that the magnetic field of the excitation magnetic field generator covers all microfilaments, thus ensuring the normal operation of the detection device.

[0007] In one implementation of the first aspect, the magnetic field sensor surrounds the outer periphery of multiple magnetically bistable microfilaments, or the magnetic field sensor is located on the same side of the multiple magnetically bistable microfilaments. By designing the relative positions of the magnetic field sensor and the multiple microfilaments as described above, the magnetic field sensor can be arranged around or near the microfilaments according to product requirements, which helps to ensure reliable reception of the pulse signals from the microfilaments by the magnetic field sensor.

[0008] In one implementation of the first aspect, the excitation magnetic field generator surrounds the outer periphery of the magnetic field sensor, which in turn surrounds the axis of multiple magnetically bistable microfilaments. In this implementation, the microfilaments can be considered as the axis of the detection device. By arranging the excitation magnetic field generator and the magnetic field sensor "concentrically," it is beneficial to ensure the magnetic field coverage of the excitation magnetic field generator, the reliable reception of the pulse signals from the microfilaments by the magnetic field sensor, and also to adapt to the structural design requirements of electronic equipment.

[0009] In one implementation of the first aspect, neither the excitation magnetic field generator nor the magnetic field sensor comes into contact with the multiple microfilaments. In this implementation, the excitation magnetic field generator and the magnetic field sensor may not contact any of the microfilaments. This satisfies the working principle of the microfilaments while preventing the excitation magnetic field generator and magnetic field sensor from squeezing the microfilaments, thus avoiding detection anomalies or decreased detection accuracy.

[0010] In one implementation of the first aspect, at least one of the following is the same: material, length, and outer diameter of the multiple magnetically bistable microfilaments. By making the multiple microfilaments have the same characteristic, these microfilaments can be made as identical (or homogeneous) as possible, which is beneficial for mass production and cost reduction.

[0011] In one implementation of the first aspect, the length of each magnetically bistable microfilament is 1 cm to 10 cm. By controlling the length of the microfilament within this range, the intensity requirements of the pulse signal generated by the microfilament can be met, while avoiding abnormalities such as bending during assembly.

[0012] In one implementation of the first aspect, each magnetically bistable microfilament includes a metal wire and a glass layer surrounding the metal wire; the diameter of the metal wire is 5 μm to 20 μm; and / or, the thickness of the glass layer is 20 μm to 50 μm. The structure of the microfilament in this implementation meets product requirements, has good mass production manufacturability, and can guarantee testing requirements.

[0013] In one implementation of the first aspect, the excitation magnetic field generator is a coil, and / or the magnetic field sensor is a coil. Using coils as both the excitation magnetic field generator and the magnetic field sensor simplifies the structural design of the detection device and meets both detection and cost requirements.

[0014] Secondly, embodiments of this application provide an electronic device, including a signal generation module, a processing module, and a detection device as described above; the signal generation module is used to send an excitation signal to an excitation magnetic field generator; the excitation magnetic field generator is used to generate a changing magnetic field signal under the excitation of the excitation signal; the processing module is used to process multiple pulse signals received by the magnetic field sensor and determine the quantity to be detected.

[0015] In this embodiment of the application, since the electronic device uses the detection device, the detection accuracy can be improved, the loss of detection accuracy can be avoided, and the performance of the electronic device can be improved.

[0016] In one implementation of the second aspect, the electronic device also includes a structural component, to which multiple magnetically bistable microfilaments are fixed. By fixing the microfilaments to the structural component, the detection device can be reliably and reasonably installed within the electronic device, and the structural component can be subjected to measurement, such as detecting the instantaneous displacement of the structural component.

[0017] In one implementation of the second aspect, a structural component is used to generate motion. The displacement of this structural component is small; for example, the structural component could be a lens assembly in a camera module of an electronic device. By fixing a microfilament to the movable structural component, the instantaneous displacement of the structural component can be detected.

[0018] In one implementation of the second aspect, multiple magnetically bistable microfilaments are fixed to the structural component using adhesive. Adhesive fixing is a simple and reliable method that meets product requirements.

[0019] In one implementation of the second aspect, any two adjacent magnetically bistable microfilaments are separated by adhesive. Separating adjacent microfilaments with adhesive not only fixes their respective positions but also maintains the spacing between them, which helps ensure the coupling performance of the microfilaments and thus guarantees the reliability of the detection function.

[0020] In one implementation of the second aspect, the excitation magnetic field generator surrounds the outer periphery of the structural component and has a gap between it and the structural component, and the excitation magnetic field generator is fixedly installed; the magnetic field sensor also has a gap between it and the structural component, and the magnetic field sensor is fixedly installed. By designing the excitation magnetic field generator, magnetic field sensor, microfilament, and structural component as described above, it is possible to avoid the excitation magnetic field generator and magnetic field sensor restricting the movement of the structural component, and it is also possible to make the excitation magnetic field generator and magnetic field sensor have a smaller size, which is beneficial to the miniaturization of electronic devices.

[0021] In one implementation of the second aspect, the frequency of the excitation signal is less than or equal to 800Hz. Setting the frequency of the excitation signal within this range ensures the differentiation of hysteresis loops in multiple microfilaments, guaranteeing the reliability of the detection.

[0022] In one implementation of the second aspect, the processing module includes a clock module and a processor. The clock module records the occurrence time of the pulse signal, and the processor determines the quantity to be detected based on the occurrence time. This implementation's processing module is mature and can meet product requirements.

[0023] Thirdly, embodiments of this application provide a detection method, which is applied to any of the above-mentioned electronic devices. The detection method includes: receiving an excitation signal; acquiring multiple pulse signals based on the excitation signal; and processing the multiple pulse signals to obtain a quantity to be detected.

[0024] In this embodiment, the excitation signal can be provided by a signal generation module, the excitation magnetic field generator can receive the excitation signal, the magnetic field sensor can receive the pulse signals generated by multiple microfilaments, and the processing module can process the multiple pulse signals received by the magnetic field sensor and determine the quantity to be detected. Unlike conventional solutions that rely on increasing the scanning frequency, this embodiment maintains a low scanning frequency while increasing the sampling frequency, thus avoiding the loss of detection accuracy caused by increasing the scanning frequency in conventional solutions.

[0025] In one implementation of the third aspect, multiple pulse signals are processed to obtain the quantity to be detected, including: acquiring time information corresponding to each of the multiple pulse signals; and obtaining the quantity to be detected based on the time information corresponding to each of the multiple pulse signals and the switching field intensity corresponding to each of the multiple microfilaments. By acquiring multiple sets of time information and based on these multiple sets of time information and the switching field intensity, accurate and reliable detection can be achieved by utilizing the characteristics of the microfilaments. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of a detection device according to an embodiment of this application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the detection device in section A;

[0028] Figure 3 A schematic diagram illustrating the arrangement of two microfilaments at intervals;

[0029] Figure 4 and Figure 5 The positional relationship between the detection device and the structural component is illustrated in another embodiment, wherein... Figure 5 for Figure 4 View from direction B;

[0030] Figure 6 The positional relationship between the detection device and the structural component is illustrated in another embodiment;

[0031] Figure 7This is a schematic diagram of the planar structure of an electronic device in one embodiment;

[0032] Figure 8 This is a cross-sectional view of the camera module.

[0033] Figures 9a-9c This illustrates the coupling effect of the microfilaments;

[0034] Figure 10 A schematic diagram illustrating the principle structure of a microfilament sensor composed of a single microfilament is shown.

[0035] Figure 11 The waveform of the triangular wave signal is illustrated. Figure 10 The correspondence of the hysteresis loops of the microfilaments in the microfilament sensor is shown.

[0036] Figure 12 A circuit structure block diagram of an electronic device in one embodiment is shown;

[0037] Figure 13 The waveform of the triangular wave signal is illustrated. Figure 12 The correspondence of the hysteresis loops of the three microfilaments is shown. Detailed Implementation

[0038] This application provides an electronic device, including but not limited to mobile phones, tablets, laptops, smart screens, in-vehicle devices, wearable devices, augmented reality (AR) glasses, AR helmets, virtual reality (VR) glasses or VR helmets, motors, electric vehicles, power converters, relays, contactors and other electrical equipment, communication network equipment, smart home devices, etc.

[0039] In this embodiment, the electronic device incorporates a detection unit comprising an array of multiple magnetically bistable microwires. The term "magnetically bistable" refers to the fact that the material's magnetization exists in only two stable saturation states: a positive saturation state and a negative saturation state. This characteristic stems from the material's positive magnetostriction effect and the axial stress introduced during manufacturing, resulting in a single axial magnetization domain structure. When the external magnetic field strength reaches the critical magnetic field strength (Hsw), the magnetic domain structure of the bistable microwire suddenly flips through a Barkhausen jump, causing the bistable microwire to transition from one saturation state to another, thus triggering a switching of the bistable microwire's magnetization state. This switching process exhibits significant nonlinear characteristics. The critical magnetic field strength Hsw can also be referred to as the switching field Hsw.

[0040] Magnetic bistable microwires possess unique magnetic bistable properties, high sensitivity, and miniaturization advantages, exhibiting excellent performance in digital signal processing. They can be applied to sensor design in industrial automation, biomedicine, and complex environments. The characteristics of magnetic bistable microwires enable them to directly convert physical quantities (such as magnetic fields, temperature, and stress) into easily processed digital signals, significantly improving measurement efficiency and accuracy. Magnetic bistable microwires possess at least the following characteristics:

[0041] 1. Bistable magnetization behavior

[0042] There are only two stable magnetization states (positive saturation and negative saturation), with no intermediate states. The switching of the magnetization state is triggered when the external magnetic field strength reaches the switching field Hsw, and the switching time of the magnetization state can be accurately measured.

[0043] 2. High sensitivity and low hysteresis

[0044] It is highly sensitive to changes in temperature, mechanical stress, and external magnetic fields, making it suitable for high-precision sensing applications. It exhibits extremely low hysteresis, with a hysteresis loop approaching a rectangle, and virtually no energy loss during switching.

[0045] 3. Miniaturization and low cost

[0046] Magnetic bistable microfilaments, with diameters in the micrometer range, are suitable for integration into microsensors. They can be fabricated using the Taylor-Ulitovsky method, which offers low production costs.

[0047] 4. Environmental adaptability

[0048] It can operate under strong magnetic field backgrounds or harsh conditions, separating target signals through digital signal processing. Its response to external magnetic fields manifests as a hysteresis loop shift; while temperature / stress primarily affects coercivity, and the interference between the two is negligible.

[0049] 5. Capability to measure multiple physical quantities

[0050] The strength of the external magnetic field can be estimated by measuring the switching time of the magnetization state, and temperature or mechanical stress can be monitored by measuring the change in coercivity, thus realizing multifunctional sensing.

[0051] In this embodiment, the magnetically bistable microwire can be composed of a metal wire (also called a metal core) and a glass layer surrounding the metal wire. In some embodiments, the atomic structure of the metal wire can be an amorphous structure, that is, the atoms are arranged in a disordered state rather than a long-range ordered crystalline structure. Such a magnetically bistable microwire can be called an amorphous magnetically bistable microwire. The amorphous properties of the amorphous magnetically bistable microwire can endow it with properties such as magnetic bistableness, high magnetostriction, and weak anisotropy. It is understood that the amorphous magnetically bistable microwire is merely an example, and the embodiments of this application are not limited thereto. For example, in some embodiments, the atomic structure of the metal wire and / or glass layer of the magnetically bistable microwire can also be a crystalline structure.

[0052] In the following text, magnetic bistable microfilaments will be referred to simply as microfilaments, and an array composed of multiple magnetic bistable microfilaments will be referred to simply as a microfilament array.

[0053] In this embodiment of the application, the detection device can detect quantities including but not limited to the distance from the moving part to the source point, temperature, pressure, and external magnetic field strength.

[0054] The detection devices in electronic devices will be explained below.

[0055] Figure 1 and Figure 2 The basic structure of the detection device in one embodiment is illustrated respectively, wherein, Figure 2 for Figure 1 A-direction view.

[0056] like Figure 1 and Figure 2 As shown, the detection device 1 can be arranged near a structural component 2 in the electronic device. The shape and internal structure of the structural component 2 are not limited. Figure 1 The illustration is merely schematic. For example, structural member 2 can be a cylindrical structure.

[0057] like Figure 1 As shown, the detection device 1 may include an excitation magnetic field generator 11, a magnetic field sensor 12, and multiple microfilaments 13. Figure 1 To distinguish them, the excitation magnetic field generator 11, the magnetic field sensor 12, and the multiple microfilaments 13 are illustrated with lines of different thicknesses.

[0058] like Figure 1As shown, exemplarily, the excitation magnetic field generator 11 can surround the outer periphery of the structural member 2, or in other words, the excitation magnetic field generator 11 can surround the entire periphery and be located outside the structural member 2. The excitation magnetic field generator 11 may not be in contact with the structural member 2, and there may be a gap between them. In this embodiment, the excitation magnetic field generator 11 is used to receive electrical signals and generate changing magnetic field signals. The changing magnetic field signal can be a periodically changing magnetic field signal (alternating magnetic field signal) or a non-periodic changing magnetic field signal. The excitation magnetic field generator 11 includes, but is not limited to, electromagnets, coils (e.g., Helmholtz coils, Maxwell coils, solenoids, etc.). For example, Figure 1 The excitation magnetic field generator 11 in the middle can be a coil.

[0059] like Figure 1 As shown, multiple microfilaments 13 can be fixed within the inner cavity 2a of the structural member 2. In this embodiment, there can be at least two microfilaments 13, for example... Figure 1 Three microfilaments 13 are illustrated. These microfilaments 13 can be arranged in pairs at intervals. They can be located on the same plane or the same curved surface, or they can be located on different planes or curved surfaces. Any two adjacent microfilaments 13 can be parallel or approximately parallel. There is a gap between any two adjacent microfilaments 13, which can be less than or equal to 5 mm, for example, 2 mm, 3 mm, 5 mm, etc. Multiple microfilaments 13 can form a microfilament array. In the changing magnetic field generated by the excitation magnetic field generator, the microfilaments 13 in the microfilament array can rapidly magnetize or demagnetize along their hysteresis loops, achieving a switching of magnetization states and thus generating pulse signals. This switching of magnetization states can be used to detect the quantity to be detected. In this embodiment, by controlling the gap within the above range, it is possible to ensure that the microfilaments 13 generate a coupling effect, thereby producing hysteresis loop differentiation, which increases the sampling frequency and improves detection accuracy. The coupling effect refers to the different magnetization properties of the two microfilaments 13 due to their different microstructures. One microfilament 13 switches its magnetization state first, while the other microfilament 13 switches its magnetization state later. This is because the first microfilament 13 switches its magnetization state first, generating an electromagnetic field A through electromagnetic effects. Since the sign of electromagnetic field A is opposite to that of the source electromagnetic field S, it weakens the source electromagnetic field S. The other microfilament 13 is affected by both the source electromagnetic field S and the electromagnetic field A, requiring further strengthening of the source electromagnetic field S before reaching its switching field. Therefore, its magnetization state switching is delayed. This principle will be further explained below.

[0060] In this embodiment, the microfilaments 13 placed side by side should not be compressed or squeezed against each other to ensure their working performance. When arranging the microfilaments 13, multiple microfilaments 13 can be laid flat and fixed at equal intervals in the installation position. For example, multiple microfilaments 13 can be fixed to the structural member 2 by adhesive bonding. To strengthen the fixation of the microfilaments 13 and reliably maintain the gap between adjacent microfilaments 13, adhesive can be provided between any two adjacent microfilaments 13. To avoid the stress effect of the adhesive on the microfilaments 13, excessive coverage of the adhesive on the microfilaments 13 should be avoided. In another embodiment, depending on product requirements, multiple microfilaments 13 can be fixed in any other suitable way, for example, by mechanically engaging structural features (e.g., grooves, holes, cavities, etc.) on the structural member 2.

[0061] Figure 3 A schematic diagram illustrating the arrangement of two microfilaments spaced 13 apart is shown. Figure 3 As shown, the microfilament 13 may include a metal wire 132 (also referred to as a metal core) and a glass layer 131 surrounding the metal wire 132.

[0062] refer to Figure 3 As shown, the diameter of the metal wire 132 can be 5μm to 20μm, for example, 5μm, 8μm, 15μm, 20μm, etc. The material of the metal wire 132 includes, but is not limited to, composite metals with iron (Fe), cobalt (Co), sodium (Na), etc., as the matrix material. For example, the composite metal is mainly composed of iron (Fe) and cobalt (Co). Such a microwire 132 can be called an iron-based microwire or a cobalt-based microwire. One or more of silicon (Si), boron (B), molybdenum (Mo), nickel (Ni), manganese (Mn), carbon (C), hafnium (Hf), etc., can be added to the matrix material. For example, the composite metal can be Fe. 76 Si9B 10 P5, or Fe 38.5 Co 38.5 B 18 Mo4Cu1.

[0063] refer to Figure 3 As shown, the thickness of the glass layer 131 can be 20 μm to 50 μm, for example, 20 μm, 30 μm, 35 μm, 50 μm, etc. The material of the glass layer 131 can be, for example, borosilicate glass, which can be composed of, for example, 73% silicon dioxide (SiO2), 16.5% boron oxide (B2O3), 6.0% lead oxide (PbO), 3.0% sodium oxide (Na2O) and 1.5% potassium oxide (K2O).

[0064] refer to Figure 3As shown, for example, the length of the microfilament 13 can be 1cm to 10cm, such as 1cm, 4cm, 10cm, etc. Controlling the length of the microfilament 13 within this range can ensure that the intensity of the generated pulse signal is high, while avoiding bending or abnormalities of the microfilament 13, thereby ensuring detection accuracy.

[0065] For example, the microwire 13 can be manufactured using a modified Taylor-Ulitovsky process (simultaneous drawing and quenching of the molten alloy). For example, the Taylor-Ulitovsky process may include the following steps:

[0066] Alloy rods were prepared according to the alloy ratio and inserted into a glass tube;

[0067] The alloy rod and glass tube are placed in a high-frequency induction heater, and the alloy rod is turned into droplets by eddy current heating.

[0068] The droplet heats the glass, making it viscous, at which point a thin glass filament can be pulled out from the softened glass portion;

[0069] The glass filaments are gradually stretched, eventually forming a glass capillary. Under suitable atmospheric pressure, molten alloy droplets will fill the capillary, thus forming a metal core encased in a glass shell.

[0070] Microfilaments are cooled by a coolant to obtain their unique microstructures, such as amorphous, nanocrystalline, and crystalline states.

[0071] The microfilaments are wound around a collector to enable continuous production.

[0072] In this embodiment, the multiple microfilaments 13 can be identical or substantially identical. For example, at least one of the following aspects is identical or approximately identical: material, length, diameter of the metal wire 132, thickness of the glass layer 131 (diameter of the metal wire 132 + 2 * thickness of the glass layer 131 = outer diameter of the microfilament 13), and manufacturing process. Exemplarily, the specifications of the multiple microfilaments 13 can be completely identical, or the multiple microfilaments 13 can be homogeneous. As will be explained below, using homogeneous multiple microfilaments 13 allows for the differentiation of hysteresis loops generated by the coupling effect of the multiple microfilaments 13, thereby increasing the sampling frequency and improving detection accuracy.

[0073] like Figure 1As shown, the magnetic field sensor 12 can be fixed within the inner cavity 2a of the structural component 2. Exemplarily, the magnetic field sensor 12 can surround the outer periphery of multiple microfilaments 13, or in other words, the magnetic field sensor 12 can surround and enclose the multiple microfilaments 13. The magnetic field sensor 12 does not contact the multiple microfilaments 13. The magnetic field sensor 12 may or may not contact the excitation magnetic field generator 11. In this embodiment, the magnetic field sensor 12 can sense the rapid magnetization or demagnetization of the microfilaments 13 and receive the pulse signal generated by the microfilaments 13. This pulse signal can be used to determine the quantity to be detected. The magnetic field sensor 12 includes, but is not limited to, magnetic field sensors based on the magnetoresistive effect (e.g., thin-film magnetoresistive sensors, magnetoresistive sensors, etc.), magnetic field sensors based on the Hall effect (e.g., Hall magnetic field sensors), magnetic field sensors based on the giant magnetoresistive effect (e.g., anisotropic magnetoresistive magnetic field sensors, giant magnetoresistive magnetic field sensors, etc.), or coils such as solenoids and Helmholtz coils. Exemplarily, Figure 1 The excitation magnetic field generator 11 in the middle can be a coil.

[0074] like Figure 1 and Figure 2 As shown, in this embodiment, the excitation magnetic field generator 11 also surrounds the outer periphery of the magnetic field sensor 12 and the outer periphery of the multiple microfilaments 13.

[0075] like Figure 1 and Figure 2 As shown, exemplarily, the excitation magnetic field generator 11 and the magnetic field sensor 12 can form a "concentric circle structure," and the two can be arranged concentrically or approximately concentrically. The length direction of the microfilaments 13 is parallel or approximately parallel to the axis of the concentric circle structure, and multiple microfilaments 13 can be disposed at the axis. In this embodiment, it can be considered that both the excitation magnetic field generator 11 and the magnetic field sensor 12 can surround the axis of the multiple microfilaments 13, wherein the axis of the microfilaments 13 is along the length direction of the microfilaments 13.

[0076] Figure 4 and Figure 5 The positional relationship between the detection device 1 and the structural member 2 in another embodiment is illustrated, wherein Figure 5 for Figure 4 View B.

[0077] like Figure 4 and Figure 5As shown, structural member 2 can be a columnar structure. The excitation magnetic field generator 11 can surround the outer periphery of structural member 2 without contacting it. Multiple microfilaments 13 can be fixed to the outer peripheral surface of structural member 2. For example, the microfilaments 13 can extend circumferentially along structural member 2 and can surround the axis o of structural member 2. The microfilaments 13 can adapt to the curvature of the outer peripheral surface of structural member 2 for better fit and fixation. The magnetic field sensor 12 can be located on the same side of the multiple microfilaments 13 and can be close to the microfilaments 13. The magnetic field sensor 12 can be without contact with structural member 2. In this embodiment, the magnetic field sensor 12 can be a coil. By placing the magnetic field sensor 12 close to the same side of the multiple microfilaments 13, rather than surrounding them, the coil volume of the magnetic field sensor 12 can be reduced. This embodiment is beneficial for miniaturizing and lightening the detection device 1. Figure 5 The magnetic field sensor 12 can be located outside the excitation magnetic field generator 11; this is merely an example. Depending on the need, the magnetic field sensor 12 can also be located inside the excitation magnetic field generator 11. Exemplarily, the detection device 1 of this embodiment can be used to detect the movement distance of the structural member 2 along its axial direction, using multiple microfilaments 13... Figure 4 and Figure 5 The posture arrangement shown can ensure the detection accuracy of axial movement distance based on the mechanism of microfilament 13 magnetization.

[0078] based on Figure 4 In the embodiment shown, Figure 6 The diagram illustrates the positional relationship between the detection device 1 and the structural member 2 in another embodiment. For example... Figure 6 As shown, the microfilament 13 can extend along the axial direction of the structural member 2, and the microfilament 13 can be parallel or approximately parallel to the axis o of the structural member 2. Multiple microfilaments 13 are used... Figure 6 The posture arrangement shown can meet some product requirements. The above is a general description of the detection device 1 in electronic devices. The specific applications of the detection device 1 in electronic devices will be listed below. It should be understood that the following description is merely an example and is not intended to limit the application scenarios of the detection device 1 in the embodiments of this application.

[0079] Figure 7 This is a schematic diagram of the planar structure of an electronic device 10 in one embodiment. For example... Figure 7 As shown, the electronic device 10 in this embodiment can be a mobile phone. The electronic device 10 may include a housing 101 and a camera module 102, etc., and may also include a display screen. It is understood that... Figure 7 The accompanying drawings below only schematically illustrate some components of the electronic device 10; the actual shape, size, location, and construction of these components are not subject to change. Figure 7 As well as the limitations of the accompanying figures below.

[0080] like Figure 7 As shown, the housing 101 can be, for example, a rear housing, and the housing 101 and the display screen can be located on opposite sides of the electronic device 10.

[0081] like Figure 7 As shown, the camera module 102 can be a rear-facing camera module that collects light from one side of the rear cover. In another embodiment, the camera module 102 can be a front-facing camera module that collects light from one side of the display screen. In this embodiment, the number of camera modules 102 can be designed as needed, for example, multiple modules.

[0082] Figure 8 This is a cross-sectional view of the camera module 102. Figure 8 As shown, the camera module 102 may include a module housing 102a and a lens assembly 102b, etc. The lens assembly 102b can be installed in the receiving cavity of the module housing 102a and can be mounted along... Figure 8 The lens assembly 102b moves in the direction of motion to achieve the actions required for imaging, such as focusing. It is understood that... Figure 8 The direction of motion is parallel to the optical axis of the camera module 102. This is merely an example and not a limitation on the embodiments of this application. For example, in another embodiment, the direction of motion can also be any direction in a plane perpendicular to the optical axis.

[0083] like Figure 8 As shown, in this embodiment, the lens assembly 102b can serve as the structural component. The detection device 1 can be located close to the lens assembly 102b. Exemplarily, the excitation magnetic field generator 11 can be fixedly installed and surround the outer periphery of the lens assembly 102b. The excitation magnetic field generator 11 can be non-contacting with the module housing 102a, or it can be wound around the module housing 102a. Multiple microfilaments 13 (or microfilament arrays) can be fixed to the outer surface of the lens assembly 102b and can move with the lens assembly 102b, or they can be fixed to the bottom surface of the lens assembly 102b and can move with the lens assembly 102b. The magnetic field sensor 12 can be located on the same side as the multiple microfilaments 13 and can be opposite to the multiple microfilaments 13. The magnetic field sensor 12 can be fixed inside the module housing 102a, or it can be fixed outside the module housing 102a.

[0084] refer to Figure 8 As shown, when the multiple microfilaments 13 move with the lens assembly 102b, their distance from the excitation magnetic field generator 11 will change. The detection device 1 can detect the distance between the microfilament array and the excitation magnetic field generator 11 at a certain moment, so that the electronic device 10 can determine the position of the lens assembly 102b at that moment.

[0085] The structural design of the detection device 1 has been explained above. The working principle of the detection device 1 will be explained below.

[0086] First, the proper nouns involved in the embodiments of this application will be explained.

[0087] 1. Switching field

[0088] In magnetic materials, the minimum applied magnetic field strength required for the magnetization direction to reverse is called the switching field. The magnetization in the axial magnetic field of a microfilament has only two states: -Ms or +Ms, where Ms represents saturation magnetization, -Ms represents reverse saturation, and +Ms represents forward saturation. -Ms and +Ms correspond to two opposite alignments of the magnetic moments. The switching between these two states is driven by domain wall propagation in a field called the switching field (corresponding to the magnetic field strength Hsw), which is sensitive to many external parameters (such as stress, temperature, and magnetic field). The initial switching field of a magnetic material is determined at the time of its production. Under certain external conditions (such as temperature and pressure), the switching field of a magnetic material can change; the changed switching field can be called the actual switching field.

[0089] 2. Hysteresis loop

[0090] A hysteresis loop represents a closed magnetization curve of a strongly magnetic material exhibiting hysteresis when the magnetic field strength changes periodically. The hysteresis loop illustrates the relationship between the magnetization intensity M or magnetic induction intensity B and the magnetic field strength H during repeated magnetization of a strongly magnetic material.

[0091] 3. Coupling effect

[0092] The coupling effect refers to the difference in magnetization properties between two microfilaments 13 due to their different microstructures. One microfilament 13 will switch its magnetization state first, while the other microfilament 13 will switch its magnetization state later. This is because when one microfilament 13 switches its magnetization state first, it generates an electromagnetic field A through electromagnetic effects. Since the sign of electromagnetic field A is opposite to that of the source electromagnetic field S, it weakens the source electromagnetic field S. The other microfilament 13 is affected by both the source electromagnetic field S and the electromagnetic field A. It requires further strengthening of the source electromagnetic field S before it reaches its switching field, thus its magnetization state switching is delayed.

[0093] Figure 9a , Figure 9b as well as Figure 9c The coupling effect can be illustrated. For example... Figure 9a As shown, for the hysteresis loop of a single microfilament 13, when the magnetic field strength exceeds the minimum value H... min Subsequently, the microfilament 13 can exhibit standard rectangular hysteresis loop characteristics. When the magnetic field strength H0 is within the range of 100 A / m to 330 A / m, for example... Figure 9aAs shown, the rectangular hysteresis loop can be well preserved at magnetic field strengths of 10000 A / m to 20000 A / m, while higher magnetic field strengths lead to distortion of the hysteresis loop. For example... Figure 9b As shown, for the hysteresis loops of two homogeneous microfilaments 13 placed side by side, it can be observed that when the hysteresis loops are within a certain range, a distinct two-segment curve can be observed (e.g., Figure 9b The hysteresis loop 3 in the image is a differentiation of the hysteresis loop caused by the coupling effect of the microfilament 13. For example... Figure 9c As shown, two homogeneous microfilaments 13 are placed side by side, and when the maximum magnetic field strength is 800 A / m, the differentiation of hysteresis loops can also occur by adjusting the magnetic field frequency. That is, when the magnetic field strength is constant, the change of the magnetic field frequency will also cause the coupling effect of the microfilaments 13.

[0094] like Figure 10 As shown, the non-contact detection principle of the microfilament 13 is first introduced by taking the distance measurement of the microfilament sensor 100 composed of a single microfilament 13 as an example.

[0095] Combination Figure 10 As shown, during distance measurement, the excitation magnetic field generator 1001 in the microfilament sensor 100 receives an excitation signal (e.g., a triangular wave signal) and sends a changing magnetic field signal. Because the magnetic field propagates and attenuates in space, when the magnetic field at the location of the microfilament 13 in the microfilament sensor 100 reaches the material's own switching field strength, the metal core of the microfilament 13 undergoes extremely rapid magnetization. This rapidly changing magnetic field excites a similarly rapidly changing electrical signal in the magnetic field sensor 1003 in the microfilament sensor 100. The instant the magnetic field sensor 1003 receives this signal indicates that the magnetic field at the microfilament 13 has reached the switching field strength.

[0096] Figure 11 The diagram illustrates the correspondence between the triangular wave signal waveform and the hysteresis loop of the microwire 13, where... Figure 11 The upper part displays the triangular wave signal waveform. Figure 11 The lower part shows the hysteresis loop. Combined with... Figure 10 and Figure 11 As shown, the hysteresis loop of the microfilament 13 is approximately rectangular due to its material properties. The intersections of this rectangle with the horizontal axis H, +Hsw and -Hsw, represent the switching fields of the material itself corresponding to +Ms and -Ms, respectively. The excitation magnetic field generator 1001 can receive... Figure 11The triangular wave signal shown above generates a continuously changing magnetic field signal in space. When the magnetic field strength at the location of microfilament 13 does not reach the switching field, the magnetization state of microfilament 13 itself does not change, therefore microfilament 13 does not generate a corresponding electrical signal in magnetic field sensor 1003. When the magnetic field reaches the switching field, the metal core of microfilament 13 undergoes rapid magnetization or demagnetization along the hysteresis loop, thereby exciting a pulsed electrical signal. Figure 11 As can be seen, the current at time t1 causes the magnetic field strength at the location of microfilament 13 to reach the switching field + Hsw. The current at time t2 causes the magnetic field strength at the location of microfilament 13 to reach the switching field - Hsw. Figure 11 The arrow in the diagram indicates that time t2 corresponds to the switching field (-Hsw). From this, we can obtain the times t1 and t2 of the two pulses within a triangular wave signal period. The appearance of this pulse signal indicates that the switching field has been reached at microfilament 13.

[0097] In one implementation, distance detection can be achieved through calculation. Specifically, the current or voltage of the triangular wave signal can be determined based on the triangular wave signal and the aforementioned t1 (or t2), thereby determining the magnetic field strength Ho at the magnetic field origin o (i.e., at the excitation magnetic field generator 1001). The magnetic field strength Hd at the microfilament 13 (the distance between the microfilament 13 and the magnetic field source point o is d) is either the switching field +Hsw or -Hsw, thus allowing the determination of the ratio of magnetic field strength Ho to magnetic field strength Hd. Furthermore, according to common knowledge in the field of electromagnetics, magnetic field strength Ho, magnetic field strength Hd, and distance d satisfy a certain relationship. Therefore, given the determination of magnetic field strengths Ho and Hd, the distance d can be determined, thereby determining the distance from the microfilament 13 to the magnetic field origin o, thus achieving distance detection.

[0098] In another implementation, distance detection can be achieved through calibration. Multiple distances d can be pre-measured using other methods, and the mapping relationship between time t and the multiple distances d can be pre-calibrated. When the microfilament sensor 100 is operating, after acquiring t1 and t2, the distance d can be directly determined.

[0099] In the above embodiment, the occurrence times t1 and t2 of the two pulses are obtained. The magnetic field strength Ho can be calculated using t1 and t2, and the calculated magnetic field strength Ho can be processed, for example, by averaging, to obtain a more accurate magnetic field strength Ho. This utilizes the two jumps of the hysteresis loop of the microwire 13 to eliminate interference, ensuring the accuracy of the magnetic field strength Ho and ultimately guaranteeing detection accuracy. It is understood that the magnetic field strength Ho can also be calculated using only the occurrence time t of a single pulse.

[0100] The principle of distance measurement by the microfilament sensor 100 composed of a single microfilament 13 has been described above. The working principle of the detection device 1 composed of multiple microfilaments 13 provided in this application embodiment will be described in detail below. The following example uses a detection device 1 comprising three spaced-apart microfilaments 13 as an example; for ease of distinction, they can be referred to as microfilament S1, microfilament S2, and microfilament S3, respectively. It is understood that the following description also applies to other numbers of microfilaments 13.

[0101] Figure 12 A circuit structure block diagram of an electronic device 30 in one embodiment is shown. Figure 13 The diagram illustrates the correspondence between the triangular wave signal waveform and the hysteresis loops of the three microwires 13, where... Figure 13 The upper part displays the triangular wave signal waveform. Figure 13 The lower part shows the hysteresis loops of three microfilaments 13. From Figure 13 It can be seen that, due to the coupling effect, the hysteresis loops of the three microfilaments 13 exhibit distinct multi-segment curves. The hysteresis loops corresponding to the three microfilaments 13 are not completely overlapping, and each microfilament 13 reaches the switching field at different times. For example, the times when microfilament S1 reaches the switching field are t1.1 and t2.1, the times when microfilament S2 reaches the switching field are t1.2 and t2.2, and the times when microfilament S3 reaches the switching field are t1.3 and t2.3.

[0102] like Figure 12 As shown, the electronic device 30 may include a signal generation module 31, a detection device 1, and a processing module 32. The detection device 1 may include three microfilaments 13: microfilament S1, microfilament S2, and microfilament S3.

[0103] like Figure 12 As shown, the signal generation module 31 sends an excitation signal to the excitation magnetic field generator 11 in the detection device 1. The excitation signal can be, for example, a triangular wave signal. The frequency of the excitation signal can be less than or equal to 800Hz, such as 800Hz, 750Hz, etc. This ensures that the excitation signal, within this frequency range, exhibits a coupling effect and maximizes the rectangularity of the hysteresis loop of the microfilament 13, thereby improving detection accuracy. In another embodiment, the frequency of the excitation signal can be set as needed, and is not limited to what is described above.

[0104] For example, the signal generation module 31 may include a controller such as a microcontroller unit (MCU), and may also include an integrator. The MCU may send a pulse width modulation (PWM) signal to the integrator, which then converts the PWM signal into a triangular wave signal.

[0105] Combination Figure 12 and Figure 13 As shown, after receiving the triangular wave signal, the excitation magnetic field generator 11 generates a changing magnetic field signal based on the triangular wave signal. This changing magnetic field signal can be, for example, a periodic magnetic field signal that increases or decreases linearly. When the magnetic field strength at the location of microfilament S1 reaches the switching field +Hsw1 or the switching field -Hsw1, the metal core of microfilament S1 will undergo rapid magnetization / demagnetization along the hysteresis loop, thereby generating a pulse signal, which can be received by the magnetic field sensor 12. At this time, due to the coupling effect between microfilaments S1, S2, and S3, the magnetic field strength at the locations of microfilaments S2 and S3 does not reach their switching field. Therefore, the magnetization state of microfilaments S2 and S3 will not change, and microfilaments S2 and S3 will not generate corresponding pulse signals in the magnetic field sensor 12. For distinction, the pulse signal generated by microfilament S1 will be referred to as pulse signal 1, the pulse signal generated by microfilament S2 as pulse signal 2, and the pulse signal generated by microfilament S3 as pulse signal 3.

[0106] Combination Figure 12 and Figure 13 As shown, with the continuous change of the magnetic field signal of the excitation magnetic field generator 11, the magnetic field strength at the location of microfilament S1 is not equal to its switching field, and microfilament S1 no longer generates pulse signal 1 in the magnetic field sensor 12. However, when the magnetic field strength at the location of microfilament S2 reaches its switching field +Hsw2 or switching field -Hsw2, the metal core of microfilament S2 undergoes rapid magnetization / demagnetization along the hysteresis loop, thereby exciting pulse signal 2. At this time, due to the coupling effect between microfilaments S1, S2, and S3, the magnetic field strength at the locations of microfilaments S1 and S3 does not reach their respective switching fields, so the magnetization state of microfilaments S1 and S3 themselves will not change, and microfilaments S1 and S3 will not generate corresponding pulse signals in the magnetic field sensor 12.

[0107] Combination Figure 12 and Figure 13 As shown, with the continuous change of the magnetic field signal of the excitation magnetic field generator 11, the magnetic field strength at the location of microfilament S2 is not equal to its switching field, and microfilament S2 no longer generates pulse signal 2 in magnetic field sensor 12. However, when the magnetic field strength at the location of microfilament S3 reaches its +Hsw3 or switching field -Hsw3, the metal core of microfilament S3 undergoes rapid magnetization / demagnetization along the hysteresis loop, thereby exciting pulse signal 3. At this time, due to the coupling effect between microfilaments S1, S2, and S3, the magnetic field strength at the locations of microfilaments S1 and S2 has not reached their respective switching fields, so the magnetization state of microfilaments S1 and S2 will not change, and microfilaments S1 and S2 will not generate corresponding pulse signals in magnetic field sensor 12.

[0108] like Figure 12 and Figure 13 As shown, the processing module 32 can process the three pulse signals received by the magnetic field sensor 12 and determine the distance.

[0109] For example, the processing module 32 may include an analog-to-digital converter (ADC) and a clock module. The ADC is used to convert analog signals into digital signals, and the clock module can obtain the pulse generation times of two pulses corresponding to each microfilament 13 within a triangular wave signal cycle. For example, the pulse generation times t1.1 and t2.1 corresponding to microfilament S1, the pulse generation times t1.2 and t2.2 corresponding to microfilament S2, and the pulse generation times t1.3 and t2.3 corresponding to microfilament S3.

[0110] For example, the processing module 32 may also include a controller such as an MCU, which may be the controller in the signal generation module 31 or a different controller. The controller in the processing module 32 may use the method described above for calculating distance based on a single microfilament 13 to calculate the corresponding distance for each microfilament 13. Then, the controller in the processing module 32 may average the multiple distances corresponding to multiple microfilaments 13 to obtain an accurate distance. Alternatively, the controller in the processing module 32 may first average the multiple pulse occurrence times recorded above, and then determine the distance based on the average time using the method described above for calculating distance based on a single microfilament 13.

[0111] As described above, this embodiment, based on the detection device 1, can receive multiple adjacent pulse signals through the magnetic field sensor 12 within one triangular wave signal cycle. The processing module 32 records the occurrence time of each pulse and determines the distance. Therefore, this embodiment can achieve multiple measurements in a single scan (the signal generation module 31 generates a triangular wave signal for one cycle, which is called one scan), thereby increasing the sampling frequency of the processing module 32, or in other words, increasing the feedback frequency of the detection device 1. The increased feedback frequency of the detection device 1 facilitates rapid detection, thus meeting product requirements.

[0112] Furthermore, since this embodiment does not increase the feedback frequency by increasing the scanning frequency, it does not sacrifice detection accuracy and simplifies the hardware architecture and detection algorithm. Conversely, conventional methods that increase the scanning frequency can easily disrupt the rectangularity of the hysteresis loop of the microfilament 13, causing the feedback signal to change from a brief, sharp pulse to a signal with a lower peak value and a wider width, resulting in a lower signal-to-noise ratio (SNR) and ultimately reduced detection accuracy. Additionally, as the scanning frequency increases, the switching field of the microfilament 13 becomes larger. This means that the actual value of the switching field strength of the microfilament 13 at higher scanning frequencies will deviate from the theoretical value, requiring specialized calibration to obtain the true value. This leads to a more complex detection hardware architecture and detection algorithm.

[0113] In addition, the detection device 1 of this embodiment can use multiple homogeneous microfilaments 13. Since the structure, material, manufacturing process and performance of these microfilaments 13 can be the same or basically the same, it is beneficial to simplify product design and reduce design and manufacturing costs.

[0114] The above embodiments calculate the magnetic field strength-distance based on time information to obtain the distance. In another embodiment, the distance can also be calculated by fitting the relationship between time information and distance. For example, multiple distances d can be measured in advance by other methods, and the mapping relationship between time t and multiple distances d can be pre-calibrated. When the detection device 1 is working, after acquiring the time information corresponding to each microfilament 13 (such as t1.1 and t2.1, or t1.2 and t2.2, or t1.3 and t2.3), the distance d can be directly determined. This embodiment can avoid complex calculations and improve detection efficiency.

[0115] The above embodiment uses the detection device 1 for distance measurement as an example, which is merely an example. In practice, the detection device 1 can also be used to measure various quantities to be detected, such as temperature, pressure, flow rate, magnetic field, and current, as needed.

[0116] For example, in one embodiment, the detection device 1 can be used to detect temperature or pressure. The principle is as follows: In this scenario, the distance d from the microfilament 13 to the magnetic field origin o is constant. Under the influence of external environmental factors such as temperature or pressure, the switching field of the microfilament 13 changes, causing a deviation between the actual switching field and the initial switching field. This actual switching field is the magnetic field strength Hd when the microfilament 13 undergoes a magnetization state switch. The difference between the magnetic field strength Hd and the initial switching field of the microfilament 13 is related to temperature or pressure. Based on this, the processing module 32 can obtain the pulse generation time of the microfilament 13 using the method described above, thereby obtaining the magnetic field strength Ho of the magnetic field origin o. Based on the magnetic field strength Ho of the magnetic field origin o and the distance d, the magnetic field strength Hd when the microfilament 13 undergoes a magnetization state switch can be determined. Furthermore, the processing module 32 can determine the difference between the magnetic field strength Hd and the initial switching field of the microfilament 13, thereby determining the temperature or pressure.

[0117] The flow rate in the pipe is related to the pressure of the fluid on the pipe. Therefore, in another embodiment, the flow rate can be determined by detecting the pressure through the detection device 1.

[0118] For example, in another embodiment, the detection device 1 can be used to detect the magnetic field at the magnetic field source point o, such as detecting the magnetic field strength Ho at the magnetic field source point o. This process has been explained above and will not be repeated here. Since the current in the line is related to the magnetic field generated by the energized line, the magnetic field at the magnetic field source point o can be detected by the detection device 1, thereby determining the current.

[0119] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0120] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Features specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0121] The term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Similarly, "fixation" should also be interpreted broadly. For example, "fixation" can be direct fixation or indirect fixation through an intermediate medium.

[0122] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the directions in the accompanying drawings. These directional terms are used to better and more clearly explain and understand the embodiments of this application, and are not intended to explicitly or implicitly suggest that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, etc., and therefore should not be construed as limiting the embodiments of this application.

[0123] In the description of the embodiments in this application, unless otherwise stated, "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: A existing alone, A and B existing simultaneously, and B existing alone.

[0124] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A detection device, characterized in that, It includes an excitation magnetic field generator, multiple magnetic bistable microfilaments, and a magnetic field sensor; The excitation magnetic field generator is used to generate changing magnetic field signals; The multiple magnetic bistable microfilaments are adjacent to each other, and there is a gap between any two adjacent magnetic bistable microfilaments, the gap being less than or equal to 5 mm; the multiple magnetic bistable microfilaments are used to generate multiple pulse signals under the excitation of the changing magnetic field signal; The magnetic field sensor is used to receive the plurality of pulse signals.

2. The detection device according to claim 1, characterized in that, The excitation magnetic field generator surrounds the outer periphery of the multiple magnetic bistable microfilaments.

3. The detection device according to claim 1 or 2, characterized in that, The magnetic field sensor is located around the outer periphery of the multiple magnetic bistable microfilaments, or the magnetic field sensor is located on the same side of the multiple magnetic bistable microfilaments.

4. The detection device according to claim 1 or 2, characterized in that, The excitation magnetic field generator surrounds the outer periphery of the magnetic field sensor, and the magnetic field sensor surrounds the axis of the multiple magnetic bistable microfilaments.

5. The detection device according to any one of claims 1-4, characterized in that, Neither the excitation magnetic field generator nor the magnetic field sensor comes into contact with the multiple microfilaments.

6. The detection device according to any one of claims 1-5, characterized in that, The multiple magnetic bistable microfilaments are identical in at least one of the following: material, length, and outer diameter.

7. The detection device according to any one of claims 1-6, characterized in that, The length of each of the magnetically bistable microfilaments is 1 cm to 10 cm.

8. The detection device according to any one of claims 1-7, characterized in that, Each of the magnetically bistable microfilaments comprises a metal wire and a glass layer surrounding the outer periphery of the metal wire; the diameter of the metal wire is 5 μm to 20 μm; and / or the thickness of the glass layer is 20 μm to 50 μm.

9. The detection device according to any one of claims 1-8, characterized in that, The excitation magnetic field generator is a coil, and / or the magnetic field sensor is a coil.

10. An electronic device, characterized in that, Includes a signal generation module, a processing module, and the detection device according to any one of claims 1-9; The signal generation module is used to send excitation signals to the excitation magnetic field generator; The excitation magnetic field generator is used to generate a changing magnetic field signal under the excitation of the excitation signal; The processing module is used to process the multiple pulse signals received by the magnetic field sensor and determine the quantity to be detected.

11. The electronic device according to claim 10, characterized in that, The electronic device also includes a structural component, to which the multiple magnetic bistable microfilaments are fixed.

12. The electronic device according to claim 11, characterized in that, The structural component is used to generate motion.

13. The electronic device according to claim 11 or 12, characterized in that, The multiple magnetic bistable microfilaments are fixed to the structural component by adhesive.

14. The electronic device according to claim 13, characterized in that, Any two adjacent magnetic bistable microfilaments are separated by adhesive.

15. The electronic device according to claims 10-14, characterized in that, The excitation magnetic field generator surrounds the outer periphery of the structural component and has a gap between it and the structural component; the excitation magnetic field generator is fixedly installed. The magnetic field sensor has a gap between it and the structural component, and the magnetic field sensor is fixedly installed.

16. The electronic device according to any one of claims 10-15, characterized in that, The frequency of the excitation signal is less than or equal to 800Hz.

Images