CN115435669A

CN115435669A - Measuring device and electronic apparatus

Info

Publication number: CN115435669A
Application number: CN202211112219.1A
Authority: CN
Inventors: 郭国典
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2022-12-06
Also published as: WO2024055672A1

Abstract

The embodiment of the application discloses a measuring device, includes: the fixed end comprises a sending coil and a receiving coil; a moving end movable relative to the stationary end, the moving end including a resonant circuit; and the processor is respectively coupled with the transmitting coil and the receiving coil, when the moving end moves relative to the fixed end, the processor applies an alternating signal to the transmitting coil, the moving end responds to the alternating signal to generate an alternating magnetic field, the receiving coil induces the alternating magnetic field to generate an induction signal and transmits the induction signal to the processor, and the processor determines the moving amount of the moving end relative to the fixed end according to the induction signal. The embodiment of the application also provides electronic equipment comprising the measuring device. Therefore, the transmitting coil, the receiving coil and the resonant circuit are adopted to generate the first induction signal and the second induction signal, so that the metal interference can be resisted, the reliability of displacement measurement is improved, and the reliability of the measuring device is further improved.

Description

Measuring device and electronic apparatus

Technical Field

The present invention relates to a displacement measurement technique, and more particularly, to a measurement device and an electronic apparatus having the measurement device.

Background

At present, the magnetic field intensity value of a moving magnet is detected by utilizing a Hall (hall) sensor array, the magnetic field intensity value of the magnet at each Hall sensor is different, the magnet can be determined in the range of a certain Hall sensor through the size relation, the magnetic field intensity value and the displacement are in one-to-one correspondence through calibration, and the displacement of the magnet can be obtained through magnetic induction intensity.

Usually, a Tunnel Magneto Resistor (TMR)/Giant Magneto Resistor (GMR)/Anisotropic Magneto Resistor (AMR) hall Sensor is used to collect the magnetic sensing direction of the magnet array, when the magnet and the Sensor (Sensor) are placed close to each other, the Sensor can obtain the direction of the magnetic field through the TMR/GMR/AMR effect, when the magnet moves, different magnetic field directions can be formed above the Sensor, the magnetic field strengths in two directions of X, Y of the TMR/GMR/AMR Sensor present a standard sine/cosine relationship, so that the magnetic field angle can be obtained by dividing the two directions. Because the angle of the magnetic field is measured, the magnetic field is insensitive to the size consistency of the magnetic field of the magnet, the magnetic field recession, the structural tolerance and the like, and is further mapped into the displacement through linear mapping.

However, the sensors rely on magnets, magnetic interference is obvious, and external magnetic fields can affect the measurement accuracy and even cause failure. AMR/GMR/TMR sensors rely on strong magnets, which may interfere with the proper operation of certain devices. And the magnet has attenuation, and the falling magnetic field is also attenuated. Therefore, the existing displacement measurement means has the technical problem of unreliability.

Disclosure of Invention

The embodiment of the application provides a measuring device and electronic equipment, which can improve the reliability of displacement measurement.

In one aspect, an embodiment of the present application provides a measurement apparatus, including:

the fixed end comprises a sending coil and a receiving coil;

a moving end movable relative to the stationary end, the moving end including a resonant circuit; and

a processor coupled to the transmit coil and the receive coil, respectively, wherein,

when the movable end moves relative to the fixed end, the processor applies an alternating signal to the sending coil, the movable end responds to the alternating signal to generate an alternating magnetic field, the receiving coil induces the alternating magnetic field to generate an induction signal and transmits the induction signal to the processor, and the processor determines the movement amount of the movable end relative to the fixed end according to the induction signal.

On the other hand, an embodiment of the present application provides an electronic device, which includes the above-mentioned measuring apparatus, a first housing, a second housing, and a flexible screen; wherein,

the second shell is connected to the first shell in a sliding mode, and the flexible screen is connected to the first shell and the second shell and can be unfolded or folded along with sliding of the second shell relative to the first shell.

In this embodiment of the application, the transmitting coil and the receiving coil of the measuring apparatus utilize an electromagnetic induction principle, and the resonant circuit utilizes a resonance principle, so that the processor can receive the first sensing signal and the second sensing signal, and the first sensing signal and the second sensing signal received by the processor can reflect a position relationship of the moving end relative to the fixed end through the arrangement of the first receiving coil and the second receiving coil, so that the processor can determine the measurement result in the total range by utilizing the first sensing signal and the second sensing signal. The transmitting coil, the receiving coil and the resonant circuit are adopted to generate the first induction signal and the second induction signal, so that metal interference can be resisted, the reliability of displacement measurement is improved, and the reliability of the measuring device is further improved.

Drawings

Fig. 1 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a first example of a stator according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a first example of a moving end according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of impedance characteristics of an LC resonant circuit according to an embodiment of the present disclosure;

FIG. 5 is a schematic circuit diagram of a first example of a measurement apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of an example of an LC resonant circuit provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a second example of a fixed end provided in the embodiment of the present application;

FIG. 8 is a waveform diagram of an example one of a sensing signal according to an embodiment of the present application;

FIG. 9 is a waveform diagram of an example two of an induced signal according to an embodiment of the present disclosure;

FIG. 10 is a waveform diagram of an example three of an induced signal provided by an embodiment of the present application;

FIG. 11 is a waveform diagram of an example four of a sensing signal provided by an embodiment of the present application;

fig. 12 is a schematic diagram of a phase angle according to an embodiment of the present application;

FIG. 13 is a waveform diagram of an inductive signal and a sub-inductive signal provided by an embodiment of the present application;

fig. 14 is a schematic perspective view of a second example of a measuring device according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a fixed end and a movable end according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of an example three of a moving end provided in the embodiment of the present application;

fig. 17a is a schematic structural diagram of a second example of a moving end according to an embodiment of the present application;

fig. 17b is a schematic structural diagram of an example three of a moving end according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of a third example of a measuring device according to an embodiment of the present disclosure;

fig. 19 is a schematic structural diagram of a fourth example of a measuring apparatus according to an embodiment of the present application;

fig. 20 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 21 is a schematic flowchart of a measurement method according to an embodiment of the present application;

fig. 22 is a block diagram of a measurement apparatus according to an embodiment of the present disclosure.

Reference numerals are as follows:

100-measuring device, 11-fixed terminal, 111-transmitting coil, 112-receiving coil, 12-moving terminal, 121-resonant circuit, 13-processor;

200-moving end, 21-plate frame of PCB, 22-sending coil, 23-receiving coil, 24-receiving coil;

300-moving end, 31-plate frame, 32-resonance inductor, 33-resonance capacitor;

51-moving end, 52-fixed end, 53-processing circuit, 531-analog switch Guan Jiediao device, 532-amplifier, 533-half bridge, 534-low pass filter, 535-MCU,536-LDO,537-Level Shift,538-AP;

61-resonant capacitance, 62-resonant inductance;

700-fixed end, 71-transmitting coil, 72-receiving coil;

131-receive coil, 132-receive coil, 133-sub-receive coil;

fixed-141, 142-moving end;

151-transmitting coil, 152-receiving coil, 153-receiving coil, 154-resonant inductance, 155-resonant capacitance;

161-sub receiving coil, 162-sub receiving coil;

17a 1-resonance capacitance, 17a 2-resonance inductance, 17b 1-resonance capacitance, 17b 2-resonance inductance;

2000-electronics, 201-measuring device, 202-first housing, 203-second housing, 204-flexible screen;

2200-measuring means, 221-processor, 222-storage medium, 223-communication bus.

Detailed Description

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

An embodiment of the present application provides a measurement apparatus, and fig. 1 is a schematic structural diagram of the measurement apparatus provided in the embodiment of the present application, and as shown in fig. 1, the measurement apparatus 100 includes: a fixed end 11, the fixed end 11 comprising a transmitting coil 111 and a receiving coil 112, a movable end 12 movable relative to the fixed end, the movable end 12 comprising a resonant circuit 121; and a processor 13, the processor 13 being respectively coupled with the transmitting coil 111 and the receiving coil 112, wherein when the moving end 12 moves relative to the fixed end 11, the processor 13 applies an alternating signal to the transmitting coil 111, the moving end 12 generates an alternating magnetic field in response to the alternating signal, the receiving coil 112 induces the alternating magnetic field to generate an induction signal and transmits the induction signal to the processor 13, and the processor 13 determines the moving amount of the moving end 12 relative to the fixed end 11 according to the induction signal.

At present, whether a hall sensor array is used for measuring displacement or a TMR/GMR/AMR hall sensor is used for measuring displacement, the hall sensor array is dependent on a magnet, magnetic interference is obvious, and an external magnetic field can influence the measuring accuracy of the hall sensor array and even cause the failure of the hall sensor array; the AMR/GMR/TMR sensor depends on a strong magnet which interferes other devices, for example, peripheral devices sensitive to a magnetic field of a DC-DC converter can influence the work of the peripheral devices if the magnet is close to each other, the magnet is attenuated, meanwhile, the falling magnetic field is also attenuated, and the reliability is not good enough.

In order to improve the reliability of displacement measurement, the present embodiment provides a measuring apparatus 100, where the measuring apparatus 100 is composed of three parts, namely a fixed end 11 including a transmitting coil 111 and a receiving coil 112, a moving end 12 including a resonant circuit 121, and a processor 13, where when the moving end 12 moves relative to the fixed end 11, the processor 13 causes the moving end 12 to generate an alternating magnetic field by an alternating signal applied to the transmitting coil 111, so that an induced signal generated by the alternating magnetic field can be induced by the receiving coil 112, where a relationship between the induced signal and a moving amount of the moving end 12 relative to the fixed end can be known by setting arrangement shapes of the transmitting coil 111 and the receiving coil 112, and finally, the processor 13 can determine the moving amount of the moving end 12 relative to the fixed end 11 according to the induced signal by using the relationship.

Thus, the displacement is measured by using the induction signal generated by the electromagnetic induction principle and the resonance principle, and the reliability of displacement measurement can be improved.

Further, in order to achieve the measurement of the displacement, the transmitting coil 111 and the receiving coil 112 need to be arranged to determine the moving amount by using the relationship between the induced signal and the moving amount of the moving end 12 relative to the fixed end 11, here, the receiving coil 112 may be arranged in a sine wave manner, and of course, the receiving coil 112 may be arranged in other arrangement forms, which is not specifically limited in the embodiment of the present application.

In addition, in the arranging the receiving coils 112 in the sine wave manner, the receiving coils 112 may be arranged by using a partial waveform of one sine wave, the receiving coils 112 may be arranged by using one sine wave, or the receiving coils 112 may be arranged by using more than one sine wave, which is not specifically limited in the embodiment of the present application.

To read the case where the receiving coil 112 adopts a sine wave-shaped arrangement, in an alternative embodiment, the receiving coil 112 includes a first receiving coil and a second receiving coil, the first receiving coil includes a first coil and a second coil connected to each other, the second receiving coil includes a third coil and a fourth coil connected to each other, the first coil, the second coil, the third coil and the fourth coil are all arranged in a sine wave shape, the phase angle of the first coil is different from that of the second coil by pi, the phase angle of the first coil is different from that of the third coil by pi/2, the phase angle of the third coil is different from that of the fourth coil by pi,

the first receiving coil induces the alternating magnetic field to generate a first induction signal, the second receiving coil induces the alternating magnetic field to generate a second induction signal, and the processor determines the movement amount of the movable end relative to the fixed end according to the first induction signal and the second induction signal.

It is understood that the receiving coil 112 may include two, namely a first receiving coil and a second receiving coil, and the first receiving coil includes two coils connected to each other, namely a first coil and a second coil, and similarly, the second coil also includes two coils connected to each other, namely a third coil and a fourth coil, and the sine wave arrangement means that the four coils are arranged in a sine wave shape, and there is a phase difference between any two coils in the four coils, wherein the phase angle of the first coil is different from that of the second coil by pi, the phase angle of the first coil is different from that of the third coil by pi/2, and the phase angle of the third coil is different from that of the fourth coil by pi, so that the receiving coil 112 is arranged such that the first induction signal and the second induction signal received by the receiving coil 112 have a specific relationship with the movement amount of the movable end 12 relative to the fixed end 11, and the movement amount can be calculated from the first induction signal and the second induction signal received by the receiving coil 112.

In order to better achieve the displacement measurement, in an alternative embodiment, the transmitting coil 111 is provided in a rectangular frame shape; the receiving coil 112 is linearly arranged in a sine wave form inside the transmitting coil 111.

That is, the transmitting coil 111 is arranged around the receiving coil 112, so that the transmitting coil 111 can generate an alternating magnetic field by the alternating signal applied by the processor 13, where the arrangement shape of the transmitting coil 111 may be a regular shape or an irregular shape, such as a rectangular frame or a circular ring, and this is not particularly limited in this embodiment of the present application.

Further, in order to improve the displacement measurement accuracy, the transmitting coil 111 is arranged around the receiving coil 112 in the shape of a rectangular frame, and the first receiving coil and the second receiving coil are arranged in the rectangular frame, so that the whole fixed end 12 is a rectangle, and when the displacement measurement is performed on the measurement object, the rectangular fixed end 12 is easier to be integrated with the measurement object for displacement measurement, which is beneficial to being applied to the inside of electronic equipment and realizing the displacement measurement.

When the transmission coil 111 has a rectangular frame shape, the first coil, the second coil, the third coil, and the fourth coil arranged in a sine wave shape have a sine wave shape in a rectangular coordinate system.

In order to calculate the moving amount of the transmitting coil 111 in the rectangular frame shape, in an alternative embodiment, the moving track of the moving end 12 relative to the fixed end 11 is a straight line, and the processor 13 is configured to:

respectively carrying out demodulation processing and filtering processing on the first induction signal and the second induction signal to obtain a processed first induction signal and a processed second induction signal;

calculating to obtain a phase angle of the movable end on the fixed end corresponding to the first coil by using the processed first induction signal and the processed second induction signal;

based on the phase angle and the wavelength of the first coil, the amount of shift is determined.

It can be understood that when a sliding track of the moving end 12 sliding in the extending direction of the receiving coil 112 is a straight line, it indicates that the receiving coil 112 extends according to a straight line, and then a moving track of the moving end 12 relative to the fixed end 11 is a straight line, so in order to determine the moving amount, the processor 13 firstly performs demodulation processing and filtering processing on the first induction signal and the second induction signal respectively, so as to obtain a processed first induction signal and a processed second induction signal, and since the first induction coil and the second induction coil adopt a sine wave arrangement manner, so that the processed first induction signal changes in sine form along with the change of the position, and the processed second induction signal changes in cosine form along with the change of the position, a sine value, a cosine value and a tangent value of an angle of the position of the moving end 12 on the fixed end 11 corresponding to a phase angle of the first coil can be known according to the processed first induction signal and the processed second induction signal, and then an inverse trigonometric function can be applied in a range of 0-2 pi to determine an only angle value, that is an angle value of the position of the moving end 12 on the fixed end 11 corresponding to the first coil angle of the first coil.

After the position of the moving end 12 on the fixed end 11 is known to correspond to the angle of the phase angle of the first coil, the arrangement of the first receiving coil and the second receiving coil indicates that the position of the moving end 12 on the fixed end 11 corresponds to the angle of the phase angle of the first coil between 0 and 2 pi, so that the displacement corresponding to the position of the moving end 12 on the fixed end 11, namely the displacement, can be calculated by multiplying the ratio of the angle of the position of the moving end 12 on the fixed end 11 to the phase angle of the first coil to 2 pi by the total stroke of the measuring device.

The total range of the measuring device is equal to the wavelength of the first coils which are arranged in a sine wave mode.

It is understood that the total range is the slidable distance of the movable end 12 in the extending direction of the receiving coil 112 of the fixed end 11, and then, since the slidable distance in the extending direction of the receiving coil 122 is the wavelength of the first coil (or the second coil, or the third coil or the fourth coil) arranged in the sine wave shape, the total range may be the wavelength of the first coil arranged in the sine wave shape.

In order to better enable the displacement measurement, in an alternative embodiment, the transmitting coil 111 is provided in the shape of a circular ring; the receiving coil 112 is arranged in a circular ring shape in a sine wave form inside the transmitting coil 111.

Here, with the annular transmission coil 111, it is possible to determine the relationship between the induced signal sensed by the reception coil 112 arranged at this time and the amount of movement of the movable end 12 with respect to the fixed end 11, and thus determine the amount of movement based on the relationship.

Further, in order to improve the displacement measurement accuracy, the transmitting coil 111 is arranged around the receiving coil 112 in a circular ring shape, and the first receiving coil and the second receiving coil are arranged in the circular ring, so that the whole fixed end 12 is circular, when the displacement measurement is performed on the measurement object, the circular movable end 11 on the fixed end 12 performs circular motion, and is easier to be integrated with the measurement object for placement, for example, the movable end is connected with a rotating shaft for displacement measurement, which is beneficial to being applied to the inside of electronic equipment, and the displacement measurement is realized.

When the transmitting coil 111 has a circular ring shape, the first coil, the second coil, the third coil, and the fourth coil arranged in a sine wave shape have a sine wave shape in a polar coordinate system.

In order to calculate the movement amount under the above-mentioned annular transmitting coil 111, in an alternative embodiment, the movement track of the movable end 12 relative to the fixed end 11 is a circle, and the processor 13 is configured to:

calculating to obtain the rotation angle of the movable end relative to the fixed end by using the processed first induction signal and the processed second induction signal; and

the amount of movement is determined based on the rotation angle and the circumference of the first coil.

It can be understood that, arranging the transmitting coil 111 in a ring shape and arranging the receiving coil 112 in the circumference formed by the ring shape, such that the moving end 12 slides along the extending direction of the receiving coil 112, for example, the extending direction of the receiving coil 112 is the direction of circular motion, such that, the extending direction of the transmitting coil 111 and the receiving coil 112 adopts the circumferential arrangement, the distance that the moving end 12 can slide on a smaller area can be longer, that is, the total range of the measuring device 100 is extended under the condition of reducing the area of the fixed end 11, thereby optimizing the structure of the measuring device.

Based on the transmitting coils 111 arranged circumferentially, it can be understood that, in order to determine the moving amount, the processor 13 firstly performs demodulation processing and filtering processing on the first sensing signal and the second sensing signal respectively, so as to obtain a processed first sensing signal and a processed second sensing signal, because the first sensing coil and the second sensing coil adopt a sine wave arrangement mode, the processed first sensing signal changes in a sine manner along with the change of the position, and the processed second sensing signal changes in a cosine manner along with the change of the position, then the sine value, the cosine value and the tangent value of the rotating angle between the moving end 11 and the fixed end 12 can be known according to the processed first sensing signal and the processed second sensing signal, and then, a unique angle value, that is, the rotating angle between the moving end 12 and the fixed end 11, can be determined by applying an inverse trigonometric function within a range of 0 to 2 pi.

After the rotation angles of the moving end 12 and the fixed end 11 are known, the number of turns of the moving end 12 rotating on the fixed end 11 can be known, and the processor 13 stores the corresponding relationship between the number of turns and the displacement, for example, one turn corresponds to the circumference of the first coil, so that the displacement corresponding to the rotation angle, that is, the moving amount, can be determined according to the corresponding relationship.

In this way, the measuring apparatus 100 having the above-described configuration can measure the target object such as a spool by connecting the rotating device of the movable end 12 and the rotating device of the target object such as a spool.

For the above-mentioned case where the moving end 12 is a resonant circuit, in one embodiment, the resonant circuit includes: a resonant capacitor and a resonant inductor; the resonance frequency of the resonance circuit is within a range of 5% up and down with reference to the frequency of the alternating signal applied to the transmission coil.

It can be understood that the LC resonant circuit is used as the moving end 12 to move on the receiving coil 112, so that the LC resonant circuit cuts the magnetic field generated by the transmitting coil 111, so that the LC resonant circuit generates an alternating magnetic field, so that the receiving coil 112 can sense the induction signal, and the movement amount is determined by the induction signal.

The resonance frequency of the resonance circuit may be a frequency at which a preset frequency value is shifted up and down with respect to the frequency of the alternating signal applied to the transmission coil 111, for example, the preset frequency value is 5% of the frequency value of the alternating signal applied to the transmission coil 111.

In addition, in order to improve the accuracy of the measurement, in an embodiment the resonance frequency of the resonance circuit is equal to the frequency of the alternating signal applied on the transmitting coil 111.

It can be understood that, when the moving end 12 adopts a resonant circuit, the frequency of the alternating signal on the transmitting coil 111 can be made equal to the resonant frequency by adjusting the resonant inductance and the resonant capacitance of the moving end 12, so that the Q value of the LC resonant circuit affects the attenuation characteristic of the resonant signal, and if the Q value is larger, the signal attenuation is slower; the impedance characteristic of the LC resonant circuit of the moving end 12 is: when the alternating signal of the transmitting coil 111 and the LC resonant circuit of the moving end 12 have the same resonant frequency, the smaller the impedance is, the smaller the attenuation is, and signals other than the equal frequency are attenuated, so that the resonant circuit has a good frequency selection characteristic, thereby improving the performance of the resonant circuit and further improving the measurement accuracy.

Further, to improve the accuracy of the displacement measurement, in one embodiment, the fixed end 12 further comprises: at least two sub receiving coils which are adjacently arranged, wherein each sub receiving coil corresponds to the moving amount in different ranges; wherein the processor 13 is coupled with at least two sub-receiving coils, respectively, wherein the processor 13 is configured to:

determining a sub receiving coil corresponding to the movement amount;

and re-determining the movement amount of the movable end relative to the fixed end according to the induction signal of the corresponding sub receiving coil.

It is understood that the fixed end 11 further includes at least two sub receiving coils arranged adjacently, and each of the two sub receiving coils arranged adjacently corresponds to a moving amount in a different range, so that the processor can determine a range in which the moving amount falls according to the moving amounts determined by the first receiving coil and the second receiving coil, and determine the sub receiving coil corresponding to the range, that is, determine the sub receiving coil corresponding to the moving amount.

The processor determines the moving amount of the moving end relative to the fixed end by determining the moving amount in the range corresponding to the sub receiving coil corresponding to the moving amount by using the induction signal received by the sub receiving coil corresponding to the moving amount, so as to achieve the purpose of re-determining the moving amount of the moving end relative to the fixed end.

In order to achieve a re-determination of the shift amount to improve the measurement accuracy, it is necessary to arrange each of the sub-receiving coils in a sine wave shape, and in an alternative embodiment, each of the at least two sub-receiving coils includes: the first sub receiving coil comprises a first sub coil and a second sub receiving coil which are connected with each other, the second sub receiving coil comprises a third sub coil and a fourth sub coil which are connected with each other, the first sub coil, the second sub coil, the third sub coil and the fourth sub coil are all arranged in a sine wave shape, the phase angle difference between the first sub coil and the second sub coil is pi, the phase angle difference between the first sub coil and the third sub coil is pi/2, and the phase angle difference between the third sub coil and the fourth sub coil is pi; the processor is further configured to:

the method comprises the steps of receiving a first sub induction signal from a first sub receiving coil, receiving a second sub induction signal from a second sub receiving coil, and re-determining the movement amount of a moving end relative to a fixed end according to the first sub induction signal and the second sub induction signal.

It can be understood that the moving end 12 slides on the receiving coil 112 along the extending direction of the receiving coil 112, and the moving amount of the total measuring range of the measuring apparatus can be measured by using two sensing signals sensed by the receiving coil 112, then, in order to improve the accuracy, the total measuring range can be divided into a plurality of sub-measuring ranges, one sub-receiving coil is arranged on each sub-measuring range, and the moving amount of the sub-measuring ranges can be measured by using two sensing signals sensed by the sub-receiving coils in the same arrangement manner as the receiving coil 112. That is, after the receiving coil 112 calculates the movement amount in the total range, the sub-range corresponding to the movement amount can be located, and then the sub-receiving coil corresponding to the sub-range is used to determine the movement amount in the sub-range corresponding to the sub-receiving coil, thereby realizing high-precision measurement of the movement amount.

In order to improve the accuracy of displacement measurement, sub-ranges of a measuring device in which a measurement result in a total range is located may be determined, each sub-range corresponds to a sub-receiving coil, which corresponds to the movement amount, for example, the total range is 20cm, and the movement amount of the total range is 9cm, so when the total range includes two sub-ranges, it may be determined that the movement amount of the total range is in the sub-range of 0-10cm, and at this time, a demodulation process and a filtering process may be performed on a first sub-induction signal and a second sub-induction signal sensed by the sub-receiving coil corresponding to the sub-range, so as to obtain a processed first sub-induction signal and a processed second sub-induction signal, and then the movement amount in the sub-range is determined according to the processed first sub-induction signal and the processed second sub-induction signal, that is the re-determined movement amount.

It should be noted that, the manner of determining the moving amount according to the processed first sub-sensing signal and the processed second sub-sensing signal is similar to the manner of determining the moving amount according to the processed first sensing signal and the processed second sensing signal, and is not described herein again.

In addition, since the sub-range is shorter than the total range, the accuracy of the shift amount of the sub-range obtained by the sub-receiving coil corresponding to the sub-range is higher than the shift amount of the total range obtained by at least two receiving coils corresponding to the total range in the case of the same bit, and thus the measurement accuracy can be improved.

In addition, in order to improve the measurement accuracy, in one embodiment, the transmitting coil 111 and the receiving coil 112 are arranged by PCB traces.

That is to say, the sending coil 121 and the at least two receiving coils 122 are all arranged by using PCB traces, so that the consistency of the coils is ensured, and the measurement accuracy can be improved.

In addition, in an alternative embodiment, the transmitting coil 111 and the receiving coil 112 are arranged on the same plane.

It can be understood that the coils in the fixed end 11 are all arranged in a plane, so that the fixed end is a plane structure, which facilitates the moving end 12 to move on the fixed end 11, and facilitates the arrangement of the measuring device inside the electronic device to be integrated with other internal structures of the electronic device, thereby realizing displacement measurement in the electronic device.

The measuring device in one or more of the above embodiments is described below by way of example.

Fig. 2 is a schematic structural diagram of an example one of the fixed end provided in the embodiment of the present application, and as shown in fig. 2, the fixed end 200 includes a board frame 21 of a PCB, a transmitting coil 22, and two sets of receiving coils, where the two sets of receiving coils are a receiving coil 23 and a receiving coil 24, respectively, the receiving coil 23 and the receiving coil 24 are arranged as shown in fig. 2, and a difference between the receiving coil 23 and the receiving coil 24 is a quarter wavelength λ, which is performed to make waveforms of sensing signals received by the receiving coil 23 and the receiving coil 24 along with a change in position consistent, but a phase difference is pi.

Fig. 3 is a schematic structural diagram of an example i of a moving end provided in the embodiment of the present application, as shown in fig. 3, the moving end 300 includes a plate frame 31, a resonant inductor 32, and a resonant capacitor 33, where the resonant inductor 32 is an inductor of a PCB coil, and an expression of a resonant frequency is as follows:

wherein f represents the resonance frequency, L represents the inductance value of the resonance inductor, and C represents the capacitance value of the resonance capacitor; the frequency f is made to be the same as the frequency of the alternating signal of the transmission coil, and the resonance frequency is made to be equal to the frequency of the alternating signal of the transmission coil by adjusting the inductance value of the resonance inductor and the capacitance value of the resonance capacitor.

Since the Q value of the LC resonant circuit may affect the attenuation characteristic of the resonant signal, if the Q value is larger, the signal attenuation is slower, fig. 4 is a schematic diagram of the impedance characteristic of the LC resonant circuit provided in the embodiment of the present application, as shown in fig. 4, a horizontal axis represents frequency, a vertical axis represents impedance, and the impedance characteristic of the LC resonant circuit at the moving end is: when the resonance frequency f of the alternating signal and the LC resonance circuit is the same, the smaller the impedance is, the smaller the attenuation is, and signals other than the resonance frequency f are attenuated, and from this viewpoint, the LC resonance circuit has a good frequency selection characteristic.

Fig. 5 is a circuit schematic diagram of an example one of a measurement apparatus provided in the embodiment of the present application, and as shown in fig. 5, the measurement apparatus includes a moving end 51, a fixed end 52 and a processing circuit 53 (equivalent to the above processor), where the fixed end 52 is composed of a transmitting coil and a receiving coil, and the coils are implemented by PCB traces; the moving end is also called as a measurement target (target) and consists of an LC resonance circuit, and the inductance part is realized by adopting a coil or a PCB (printed Circuit Board) wire; the processing circuit 53 includes: analog switch Guan Jiediao, amplifier 532, half bridge 533, low pass filter 534, micro control Unit 535 (MCU), low drop out Regulator 536 (LDO), level Shift 537 (Level Shift), and Application Processor 538 (AP).

The fixed end 52 is a high-frequency alternating signal transmitted on a channel of a transmitting link (TX), the processing circuit 53 applies the high-frequency alternating signal to a transmitting coil through a half bridge 533, a measurement target is a slide block formed by an LC resonance circuit, the slide block generates resonance and generates an alternating magnetic field, and a receiving link (RX) has two channels, such as the specific staggered structure shown in fig. 2, which can make signals induced by the receiving coil have a phase difference of pi and opposite winding directions, so as to eliminate coupling interference; the resonant circuit has the advantages that the specific resonant frequency reflects electromagnetic waves, the receiving coil receives the electromagnetic waves, and the interference of nearby metal eddy current effects on the measuring device can be filtered out, so that the reliability and the anti-interference performance of the measuring device are stronger.

Based on the above-mentioned measuring apparatus shown in fig. 5, the resonant circuit of the moving end 51 can also be shown in fig. 6, and fig. 6 is a schematic structural diagram of an example of an LC resonant circuit provided in the embodiment of the present application. As shown in fig. 6, the resonant inductor 62 is a wound inductor and is connected in series with the resonant capacitor 61 to form a moving end.

The processing of the induced signal during the measurement of the measurement target by the measuring apparatus shown in fig. 5 can be further described with reference to fig. 7 to 13.

Fig. 7 is a schematic structural diagram of a second example of a fixed end provided in the embodiment of the present application, and as shown in fig. 7, the fixed end 700 includes: a transmitting coil 71 and a receiving coil 72 (the other receiving coil is not shown), the processing circuit giving the transmitting coil 71 an alternating excitation signal U = sin ω t; after the square wave is output by the singlechip, the excitation signal becomes a sine wave after being subjected to half-bridge enhanced driving capability and filtered by the sending coil 71 and the capacitor.

The LC resonant circuit at the moving end induces an alternating excitation signal, an alternating magnetic field is generated at the receiving coil 71, and the receiving coil 71 receives the induced signal. When the right edge of the fixed end 700 in fig. 7 is at point a, the signal is at a value of 0, as the slider moves, the amplitude of the sensing signal received by the receiving coil 71 in the sensing process increases gradually, when the right edge of the moving end reaches point C, the amplitude of the received sensing signal reaches a peak value, then as the slider moves, the strength of the sensing signal received by the receiving coil 71 decreases gradually, when the right edge of the moving end reaches point D, the amplitude of the received sensing signal is 0, the sensing signal continues to move to the right, the amplitude increases gradually, when the right edge of the moving end reaches point E, the peak value of the sensing signal received by the receiving coil 71 reaches the highest, the sensing signal continues to move to the right, the strength of the sensing signal received by the receiving coil 71 decreases gradually, and when the left edge of the slider is at point E, the receiving signal falls back to 0.

Fig. 8 is a waveform diagram of an example of a first sensing signal provided by an embodiment of the present application, and as shown in fig. 8, the sensing signal received by the receiving coil 71 changes with the position of the moving end relative to the fixed end, and the strength of the sensing signal sensed by the receiving coil 71 also changes with the position, as can be seen from fig. 8, this changing waveform is consistent with the AM amplitude modulation signal.

Fig. 9 is a waveform diagram of an example two of the induced signal provided in the embodiment of the present application, and as shown in fig. 9, the induced signal received by the receiving coil 71 is subjected to analog switch demodulation by using the analog switch Guan Jiediao device in fig. 5.

Fig. 10 is a waveform diagram of an example three of an induced signal according to an embodiment of the present application, and fig. 10 is a waveform obtained by filtering a high-frequency signal after performing a low-pass filter on the waveform in fig. 9 by using the low-pass filter in fig. 5.

Fig. 11 is a waveform diagram of an example of an induction signal provided in this embodiment, as shown in fig. 11, a horizontal axis is a movement amount, a thick line is a waveform of the processed induction signal obtained by the receiving coil 23, and an obtained voltage signal (corresponding to the processed induction signal) also changes in a sinusoidal manner with a change in position, however, a single sinusoidal signal cannot determine an angle of the slider with respect to a fixed end, and two sinusoidal signals need to be used, so that the coil is intentionally shifted by a quarter wavelength, and a thin line is a waveform of the processed induction signal obtained by the receiving coil 24, so that the induction signals received by the two receiving coils are sinusoidal waves having a phase difference of pi.

The electromagnetic coupling factor of the resonant circuit of the fixed end and the movable end is approximately constant, and when the resonant circuit is in a measurement range, the resonant circuit is always electrified. Fig. 12 is a schematic diagram of a phase angle provided in the embodiment of the present application, and as shown in fig. 12, after knowing two sensing signals, a sine value and a cosine value can be known, and through fig. 12, a quadrant where the position of the moving end on the fixed end corresponds to the phase angle of the first coil is determined, and a phase angle pr (equivalent to the above relative angle) is calculated by using an arctangent:

wherein k is _sin Representing the processed induction signal, k, of the first receiving coil _cos The actual displacement L can be calculated from the angle at which the position of the moving end on the fixed end corresponds to the phase angle of the first coil, which represents the processed induced signal of the second receiving coil, using the following equation:

wherein λ is the total range, and is actually equal to the wavelength of the receiving coil.

In order to further improve the measurement accuracy, at least two sub receiving coils which are adjacently arranged may be disposed on the fixed end, the specific arrangement of each sub receiving coil is similar to the arrangement of the at least two receiving coils, and the induction signals received by the at least two sub receiving coils are also similar to the at least two receiving coils, which is not described herein again.

Based on the above at least two receiving coils and at least two sub-receiving coils, fig. 13 is a waveform diagram of an induction signal and a sub-induction signal provided in this embodiment of the present application, as shown in fig. 13, if a measurement distance is longer and it is necessary to satisfy the same measurement accuracy, on the basis of at least two receiving coils, that is, the receiving coil 131 and the receiving coil 132 (dotted line waveform in fig. 13), a plurality of sub-receiving coils are additionally added, and fig. 13 shows a group of sub-receiving coils 133 (solid line waveform in fig. 13), it should be noted that each group of sub-receiving coils corresponds to one sub-range, at least two receiving coils are used for positioning the initial position, and each group of sub-receiving coils is used for positioning in the corresponding sub-range, that is, a precise measurement coil group is used to measure a precise position.

Fig. 14 is a schematic perspective view of an example two of a measuring device provided in an embodiment of the present application, and as shown in fig. 14, the measuring device is placed on a measurement target, a fixed end 141 is fixedly placed, and a movable end 142 is disposed on the fixed end 141 and can slide on the fixed end 141, and through sliding of the movable end 142 on the fixed end 141, the measuring device can be used for measuring displacement of the target object.

In order to optimize the structure of the measuring device for measuring different kinds of measuring objects, for example, in the case of a roll screen, the moving displacement of the roll screen can be calculated by bending a linear coil into a circular shape and calculating the angle of rotation.

Fig. 15 is a schematic structural diagram of a fixed end and a movable end provided in an embodiment of the present application, and as shown in fig. 15, the fixed end includes a sending coil 151, a receiving coil 152, and a receiving coil 153, where a processed first induction signal corresponding to the receiving coil 152 is a sine wave, and a processed second induction signal corresponding to the receiving coil 153 is a cosine wave; the moving end comprises a resonant circuit, the resonant circuit comprises a resonant inductor 154 and a resonant capacitor 155, the resonant inductor 154 and the resonant capacitor 155 are formed by winding coils, the transmitting coil 151 is in a circular ring shape, the receiving coil 152 and the receiving coil 153 are arranged in a sine wave shape, the phase difference between the receiving coil 152 and the receiving coil 153 is pi, the moving end moves circumferentially on the receiving coil 152 and the receiving coil 153 around the center of the circle of the transmitting coil 151, thus, when the processor applies an alternating signal to the transmitting coil 111, the moving end responds to an alternating magnetic field generated by the alternating signal, so that the receiving coil 152 senses a first induction signal and the receiving coil 153 senses a second induction signal, after receiving the first induction signal and the second induction signal, the processor respectively performs demodulation processing and filtering processing on the first induction signal and the second induction signal to obtain a processed first induction signal and a processed second induction signal, and can calculate the rotation angle of the moving end on the fixed end by using the processed first induction signal and the processed second induction signal, and the processor determines the corresponding rotation angle as the movement amount by using the corresponding relationship between a preset angle and the displacement; for example, when the rotation angle is pi, the corresponding displacement is M, the movement amount is M, when the rotation angle is 2 pi, the corresponding displacement is 2M, when the rotation angle is 4 pi, the corresponding displacement is 4M, and the movement amount is 4M.

Fig. 16 is a schematic structural diagram of a third example of a fixed end provided in an embodiment of the present application, as shown in fig. 16, based on fig. 15, further including: at least adjacently arranged sub-receiving coils, wherein a group of sub-receiving coils comprises: a sub-receiving coil 161 and a sub-receiving coil 162; the sub-receiving coils 161 and the sub-receiving coils 162 are both in sine wave shapes, the phase difference is pi, and one group of sub-receiving coils corresponds to one sub-range and is used for carrying out displacement measurement again in the sub-range, so that the measurement accuracy is improved.

For example, after the rotation angle is measured through fig. 15, a movement amount may be obtained according to the rotation angle, then the first sub-sensing signal and the second sub-sensing signal are respectively demodulated and filtered based on the first sub-sensing signal and the second sub-sensing signal sensed by the sub-receiving coil corresponding to the movement amount, so as to obtain a processed first sub-sensing signal and a processed second sub-sensing signal, and the rotation angle of the moving end on the fixed end may be obtained again by using the processed first sub-sensing signal and the processed second sub-sensing signal, so as to determine the movement amount again, thereby improving the measurement accuracy.

Fig. 17a is a schematic structural diagram of an example two of a moving end provided in the embodiment of the present application, and as shown in fig. 17a, the moving end includes a resonant capacitor 17a1 and a resonant inductor 17a2, and the resonant inductor 17a2 is formed by winding a coil, where the moving end may be applied to a rectangular fixed end to perform linear motion, and may also be applied to a circular fixed end to perform linear motion, where this is not particularly limited in the embodiment of the present application. The resonant frequency f is set to be equal to the frequency of the signal on the transmission coil, and the capacitance of the resonant capacitor 17a1 and the inductance of the resonant inductor 17a2 are adjusted to be equal to each other.

Fig. 17b is a schematic structural diagram of an example three of a moving end provided in the embodiment of the present application, and as shown in fig. 17b, the moving end includes a resonant capacitor 17b1 and a resonant inductor 17b2, and the resonant inductor 17b2 is formed by winding a coil, where the moving end may be applied to a rectangular fixed end to perform linear motion, and may also be applied to a circular fixed end to perform linear motion, where this is not specifically limited in the embodiment of the present application. The resonance frequency f is made equal to the frequency of the signal at the transmission coil, and the capacitance value of the resonance capacitor 17b1 and the inductance value of the resonance inductor 17b2 are adjusted to make the frequencies equal.

Fig. 18 is a schematic structural diagram of a third example of a measuring device according to an embodiment of the present application, and as shown in fig. 18, the difference from fig. 5 is that the fixed end and the moving end in fig. 15 are used as the fixed end, and the moving end in fig. 18 is used as the moving end.

The electromagnetic coupling factor of the resonators at the fixed end and the movable end is approximately constant, the resonators are always electrified when the resonators are in a measurement range, the two induction signals received by the processing circuit through the receiving coil 152 and the receiving coil 153 of the resonators change in a sine mode along the measurement range, and the phase angle is obtained by measuring the amplitude of the two induction signals.

The actual rotation angle can be calculated by calculating the phase angle by combining sin and cos values and calculating the rotation angle pr by using the arctangent, that is, by calculating pr using the above formula (2).

In actual measurement, the displacement of the sliding scroll screen is converted into a rotation angle, the measuring device is large, so that a plane is required to be placed on a machine, the rotation is converted into plane rotation through a gear rotation mechanism, and the displacement corresponding to pr is determined as the movement amount through the angle value pr calculated in the example.

Fig. 19 is a schematic structural diagram of an example four of a measuring device according to an embodiment of the present invention, as shown in fig. 19, the measuring device (corresponding to an angle encoder) is connected to a motor of a transmission mechanism of a sliding and rolling screen, and a width of the sliding and rolling screen changes along with rotation of the motor, at this time, the measuring device is used for measuring an unwinding width of the sliding and rolling screen to obtain the unwinding width of the sliding and rolling screen. The rotation of the motor output shaft in a vertical plane (or in a plane in which the thickness direction of the electronic device is located) can be converted into rotation of the fixed end in a horizontal plane (or in a plane perpendicular to the thickness direction of the electronic device), for example, by a bevel gear, wherein the fixed end is connected to the motor output shaft via the bevel gear. At this time, the fixed end performs a rotational motion, and the movable end is fixed to the housing and performs a rotational motion with respect to the fixed end, so the fixed end may be referred to as the movable end instead, and the movable end may be referred to as the fixed end instead.

In the above example, the high-frequency signal of the sending coil is actively driven and modulated, and the sending coil is insensitive to magnetic field interference, easy to install, has certain adaptability to installation tolerance, is resistant to electromagnetic interference, is dustproof, is oil-proof, does not influence the use in a warm and humid environment, has high precision, and can increase the digit of an Analog-to-digital converter (ADC) or reduce the wavelength of the measuring coil, thereby achieving higher measuring precision.

Therefore, the measuring target is based on the electromagnetic induction principle and the resonant principle, metal interference can be resisted, the sending coil and the receiving coil are realized by PCB wiring, the coil consistency is good, and the measuring precision is improved.

The embodiment of the application provides a measuring device, in the embodiment of the application, the transmitting coil and the receiving coil of the measuring device utilize an electromagnetic induction principle, the resonance circuit utilizes a resonance principle, the processor can receive a first induction signal and a second induction signal, and the first induction signal and the second induction signal received by the processor can reflect the position relation of a movable end relative to a fixed end through the arrangement of the first receiving coil and the second receiving coil, so that the processor can determine a measuring result in a total range by utilizing the first induction signal and the second induction signal.

Based on the same inventive concept of the foregoing embodiments, an electronic device is provided in an embodiment of the present application, fig. 20 is a schematic structural diagram of an electronic device provided in an embodiment of the present application, and as shown in fig. 20, the electronic device 2000 includes a measuring apparatus 201, a first housing 202, a second housing 203, and a flexible screen 204, which are described in one or more embodiments above; wherein,

the second housing 203 is slidably connected to the first housing 202, and the flexible screen 204 is connected to the first housing 202 and the second housing 203 and can be expanded or contracted as the second housing 203 slides relative to the first housing 202.

In an alternative embodiment, the fixed end is arranged on the first housing 202, the movable end is arranged on the second housing 203, and the measuring device 201 is the measuring device in the embodiment as described in fig. 5; the movable end moves linearly relative to the fixed end as the second housing 203 slides relative to the first housing 202.

In an alternative embodiment, the device further comprises a motor for driving the second housing to slide relative to the first housing, the fixed end is connected with an output shaft of the motor, and the measuring device is the measuring device in the embodiment shown in fig. 18; the movable end moves circularly relative to the fixed end along with the rotation of the output shaft of the motor.

Based on the same inventive concept of the foregoing embodiments, an embodiment of the present application provides a measurement method, which is applied to a processor of a measurement apparatus according to one or more embodiments described above, and fig. 21 is a schematic flow chart of the measurement method provided in the embodiment of the present application, as shown in fig. 21, where the method includes:

s2101: when the processor applies an alternating signal to the sending coil of the fixed end and the moving end moves relative to the fixed end, receiving an induction signal from the receiving coil;

s2102: and determining the movement amount of the movable end relative to the fixed end according to the induction signal.

In one embodiment, the method may further include:

receiving a first induction signal from the first receiving coil and a second induction signal from the second receiving coil;

and determining the movement amount of the movable end relative to the fixed end according to the first induction signal and the second induction signal.

In an alternative embodiment, the moving track of the moving end relative to the fixed end is a straight line, and the amount of movement of the moving end relative to the fixed end is determined according to the first sensing signal and the second sensing signal, including:

calculating to obtain a phase angle of the position of the movable end and the fixed end corresponding to the first coil by using the processed first induction signal and the processed second induction signal;

In one embodiment, the track of the moving end relative to the fixed end is a circle, and the determining the moving amount of the moving end relative to the fixed end according to the first sensing signal and the second sensing signal includes:

calculating to obtain the rotation angle of the movable end and the fixed end by using the processed first induction signal and the processed second induction signal;

In one embodiment, the method further comprises:

determining a sub-receiving coil corresponding to the movement amount;

Fig. 22 is a block diagram of a measurement apparatus according to an embodiment of the present application, and as shown in fig. 22, an embodiment of the present application provides a measurement apparatus 2200 including:

a processor 221 and a storage medium 222 storing instructions executable by the processor 221, the storage medium 222 relying on the processor 221 to perform operations via a communication bus 223, the instructions, when executed by the processor 221, performing the measurement method performed in one or more of the above embodiments.

It should be noted that, in actual application, the various components in the measuring apparatus are coupled together through the communication bus 223. It is understood that communication bus 223 is used to enable connected communication between these components. Communication bus 223 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for clarity of illustration the various buses are labeled in figure 22 as communication bus 223.

Embodiments of the present application provide a computer storage medium storing executable instructions that, when executed by one or more processors, perform the measurement method as described above as performed by the control device in one or more of the embodiments.

The computer-readable storage medium may be a magnetic random access Memory (FRAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM).

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims

1. A measurement device, comprising:

the fixed end comprises a sending coil and a receiving coil;

2. The measurement apparatus according to claim 1, wherein the reception coil includes a first reception coil and a second reception coil, the first reception coil includes a first coil and a second coil connected to each other, the second reception coil includes a third coil and a fourth coil connected to each other, the first coil, the second coil, the third coil, and the fourth coil are each arranged in a sine wave shape, the first coil and the second coil differ in phase angle by π, the first coil and the third coil differ in phase angle by π/2, the third coil and the fourth coil differ in phase angle by π,

3. The measuring device according to claim 2, wherein the transmitting coil is provided in a rectangular frame shape, and the receiving coil is linearly arranged in a sine wave form inside the transmitting coil.

4. The measurement device of claim 3, wherein a trajectory of movement of the movable tip relative to the fixed tip is a straight line, the processor configured to:

respectively demodulating and filtering the first induction signal and the second induction signal to obtain a processed first induction signal and a processed second induction signal;

calculating to obtain a phase angle of the movable end on the fixed end, which corresponds to the first coil, by using the processed first induction signal and the processed second induction signal;

determining the amount of movement based on the phase angle and a wavelength of the first coil.

5. A measuring device according to claim 2, characterized in that the transmitting coil is arranged in a circular ring shape and the receiving coil is arranged in a circular ring shape in the form of a sine wave inside the transmitting coil.

6. The measurement device of claim 5, wherein a trajectory of movement of the movable tip relative to the fixed tip is a circle, the processor configured to:

calculating to obtain a rotation angle of the movable end relative to the fixed end by using the processed first induction signal and the processed second induction signal;

the movement amount is determined based on the rotation angle and the circumference of the first coil.

7. The measurement device of claim 1, wherein the resonant circuit comprises: a resonance capacitance and a resonance inductance, and a resonance frequency of the resonance circuit is within a range of 5% up and down with reference to a frequency of the alternating signal applied to the transmission coil.

8. The measuring device of claim 1, wherein the fixed end further comprises at least two sub-receiving coils arranged adjacently, each sub-receiving coil corresponding to a different range of movement; wherein the processor is coupled with the at least two sub-receive coils, respectively, wherein the processor is configured to:

determining a sub receiving coil corresponding to the movement amount;

and re-determining the movement amount of the movable end relative to the fixed end according to the induction signal of the corresponding sub-receiving coil.

9. The measurement device of claim 8, wherein each of the at least two sub-receive coils comprises: the receiving coil comprises a first sub receiving coil and a second sub receiving coil, wherein the first sub receiving coil comprises a first sub coil and a second sub coil which are connected with each other, the second sub receiving coil comprises a third sub coil and a fourth sub coil which are connected with each other, the first sub coil, the second sub coil, the third sub coil and the fourth sub coil are arranged in a sine wave shape, the phase angle difference between the first sub coil and the second sub coil is pi, the phase angle difference between the first sub coil and the third sub coil is pi/2, and the phase angle difference between the third sub coil and the fourth sub coil is pi; the processor is further configured to:

receiving a first sub-induction signal from the first sub-receiving coil, receiving a second sub-induction signal from the second sub-receiving coil, and re-determining the movement amount of the moving end relative to the fixed end according to the first sub-induction signal and the second sub-induction signal.

10. The measurement device according to claim 1, wherein the transmitting coil and the receiving coil are arranged by using a PCB (printed Circuit Board) trace, and the transmitting coil and the receiving coil are arranged on the same plane.

11. An electronic device, comprising: the measurement device, first housing, second housing and flexible screen of any of the preceding claims 1 to 10; wherein,

12. The electronic device of claim 11, wherein the fixed end is disposed on the first housing, the movable end is disposed on the second housing, and the measuring apparatus is the measuring apparatus of claim 3 or 4; the movable end moves linearly relative to the fixed end along with the sliding of the second shell relative to the first shell.

13. The electronic device according to claim 11, further comprising a motor for driving the second housing to slide relative to the first housing, wherein the fixed end is connected to an output shaft of the motor, and the measuring apparatus is the measuring apparatus according to claim 5 or 6; the movable end moves circularly relative to the fixed end along with the rotation of the output shaft of the motor.