CN111157105A - Tremor sensor and tremor detection device - Google Patents
Tremor sensor and tremor detection device Download PDFInfo
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- CN111157105A CN111157105A CN202010009938.5A CN202010009938A CN111157105A CN 111157105 A CN111157105 A CN 111157105A CN 202010009938 A CN202010009938 A CN 202010009938A CN 111157105 A CN111157105 A CN 111157105A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1101—Detecting tremor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/40—Detecting, measuring or recording for evaluating the nervous system
- A61B5/4076—Diagnosing or monitoring particular conditions of the nervous system
- A61B5/4082—Diagnosing or monitoring movement diseases, e.g. Parkinson, Huntington or Tourette
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- A—HUMAN NECESSITIES
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- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/746—Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms
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Abstract
The invention relates to the technical field of medical instruments and provides a tremor sensor and tremor detection equipment. The tremor sensor includes a housing, a button, and a piezoelectric portion; the shell is provided with a through hole; the button is movably arranged in the through hole; piezoelectric unit locates in the shell, and piezoelectric unit supports with the button and leans on, and piezoelectric unit includes gasket and the two electrode slices of locating the relative both sides face of gasket of one-to-one, and the button accepts the pressure that tremble produced and transmits pressure to the electrode slice, and two electrode slices change area of contact in order to change resistance under the pressure effect. The tremor amplitude and frequency of the fingers of the Parkinson's disease patient are detected through resistance change, and the device is noninvasive and nondestructive without blood drawing examination; the period is short, the tremor index with real time and high accuracy can be provided for doctors, and the detection equipment has simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a tremor sensor and tremor detection equipment provided with the tremor sensor.
Background
Parkinson's disease, also known as parkinsonism, is the most common degenerative disease of the central nervous system of the elderly. Tremor refers to the tremor and shaking of the fingers and limbs, while paralysis refers to the inability of some or all of the limbs to move autonomously. Parkinson's disease usually progresses slowly, and early signs of the disease are often overlooked, and detection and treatment are carried out until the disease has affected life, and usually Parkinson's disease enters the middle and late stages. At this point, the optimal treatment period has been missed and, in addition, the diagnostic process for Parkinson's disease is a continuous observation process. Parkinson's disease is usually accompanied by tremor of limbs when the disease occurs, so that the detection of the presence of tremor of limbs is a necessary link for timely detection and early diagnosis of Parkinson's disease.
At present, the detection equipment for the disease adopts high-cost materials and complex preparation process, so that the structure is complex, the cost is high, and a long detection period is required for blood or gene detection.
Therefore, it is necessary to develop a new tremor sensor and a tremor detection apparatus mounted with the tremor sensor.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defects of higher cost and longer period of the prior art and provide a tremor sensor with lower cost and shorter period and a tremor detection device provided with the tremor sensor.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
According to one aspect of the present disclosure, there is provided a tremor sensor, comprising:
a housing having a through hole formed therein;
the button is movably arranged in the through hole;
the piezoelectric part is arranged in the shell and abutted to the button, the piezoelectric part comprises a gasket and two electrode plates which are arranged on two opposite side faces of the gasket in a one-to-one correspondence mode, the button receives pressure generated by tremor and transmits the pressure to the electrode plates, and the contact area of the two electrode plates is changed under the action of the pressure to change the resistance.
In an exemplary embodiment of the present disclosure, the piezoelectric portion further includes:
the flexible base material is arranged on one surface of the electrode plate, which deviates from the gasket.
In an exemplary embodiment of the present disclosure, the piezoelectric portion further includes:
and the protective layer is arranged on one surface of the flexible substrate, which deviates from the gasket.
In an exemplary embodiment of the present disclosure, the flexible substrate is made of plastic, filter paper or polyimide, the protective layer is made of polydimethylsiloxane or rubber, and the electrode sheet is made of graphite or metal.
In an exemplary embodiment of the present disclosure, a lamination direction of the piezoelectric portion is perpendicular to a pressing direction of the button, and one side surfaces of both the electrode sheets abut against the button.
In an exemplary embodiment of the present disclosure, the tremor sensor further includes:
and the protruding part is fixed on the inner side wall of the shell and is positioned on one side of the electrode plate close to the shell.
In an exemplary embodiment of the disclosure, the button abuts a face of one of the electrode pads facing away from the gasket.
According to one aspect of the present disclosure, there is provided a tremor detection device comprising:
a tremor sensor according to any of the above;
and the detection circuit is electrically connected to the two electrode plates.
In an exemplary embodiment of the present disclosure, the detection circuit includes:
the positive and negative electrodes of the power supply are electrically connected to the two electrode plates in a one-to-one corresponding manner;
and the ammeter is connected with the power supply and the electrode plate in series.
In an exemplary embodiment of the present disclosure, the tremor detection device further includes:
the signal processor is electrically connected with the detection circuit;
the amplifier is electrically connected with the signal processor;
and the wireless transmitter is electrically connected with the amplifier.
According to the technical scheme, the invention has at least one of the following advantages and positive effects:
according to the tremor sensor disclosed by the invention, pressure is applied to the button in the tremor process of the finger of the patient suffering from Parkinson's disease, the button receives the pressure generated by the tremor and transmits the pressure to the electrode plate, and the electrode plate changes the contact area under the action of the pressure so as to change the resistance. The tremor amplitude and frequency of the fingers of the Parkinson's disease patient are detected through resistance change, and the device is noninvasive and nondestructive without blood drawing examination; the period is short, the tremor index with real time and high accuracy can be provided for doctors, and the detection equipment has simple structure and low cost.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic structural view of one embodiment of a tremor sensor of the present invention;
FIG. 2 is a schematic perspective view of the tremor sensor of FIG. 1;
fig. 3 is a schematic structural view of the piezoelectric portion in fig. 1;
FIG. 4 is a schematic diagram of the tremor sensor of FIG. 1 after the piezoelectric portion has been bent to receive tremors;
FIG. 5 is a schematic view of the piezoelectric portion of FIG. 1 after bending;
FIG. 6 is a schematic structural view of another embodiment of a tremor sensor of the present invention;
FIG. 7 is a schematic diagram of the tremor sensor of FIG. 6 after the piezoelectric portion has been bent to receive tremors;
FIG. 8 is a block diagram schematically illustrating the construction of one embodiment of the tremor detection device of the present invention;
FIG. 9 is a schematic structural view showing the connection of electrode plates with a power supply and an ammeter in the tremor detection apparatus of the present invention;
FIG. 10 is a schematic diagram of the current change during tremor compressions;
FIG. 11 is a schematic diagram of the time current variation of slight tremor;
FIG. 12 is a graph showing the time-current variation of light and severe flicker;
fig. 13 is a schematic diagram of the time current change of light and very severe chattering.
The reference numerals of the main elements in the figures are explained as follows:
1. a housing;
2. a piezoelectric portion; 21. a gasket; 22. an electrode sheet; 23. a flexible substrate; 24. a protective layer;
3. a button; 4. a protrusion; 5. a tremor sensor; 6. a power source; 7. an ammeter; 8. a signal processor; 9. an amplifier; 10. a wireless transmitter.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
The invention firstly provides a tremor sensor, which is shown in a schematic structural diagram of an embodiment of the tremor sensor in figure 1; the tremor sensor may include a housing 1, a button 3, and a piezoelectric portion 2. The shell 1 is provided with a through hole; the button 3 is movably arranged in the through hole; piezoelectric unit 2 locates in the shell 1, piezoelectric unit 2 with button 3 supports and leans on, piezoelectric unit 2 includes gasket 21 and one-to-one locates two electrode slices 22 of the relative both sides face of gasket 21, button 3 accepts the pressure that the tremor produced and with pressure transmission reaches electrode slice 22, two electrode slices 22 change area of contact under the pressure effect in order to change resistance.
In the present exemplary embodiment, referring to the schematic perspective structure of the tremor sensor in fig. 1 shown in fig. 2, the housing 1 is provided as a cylindrical case, and the housing 1 has a cylindrical side wall, and a circular top wall and a circular bottom wall at both ends of the side wall. The through hole is provided on the top wall, and the shape of the through hole may be circular. Of course, in other exemplary embodiments of the present invention, the housing 1 may also be provided in a square shape, a truncated cone shape, a truncated pyramid shape, or the like; the shape of the through-hole may also be square, polygonal, etc.
In the present exemplary embodiment, referring to a schematic structural view of the piezoelectric portion 2 in fig. 1 shown in fig. 3, the piezoelectric portion 2 is provided in an elongated shape. The number of the spacers 21 may be two, and the spacers 21 may be elongated. The electrode sheet 22, the flexible base material 23, and the protective layer 24 may be provided in elongated shapes, and the length of the gasket 21 may substantially coincide with the width of the electrode sheet 22. The two spacers 21 are disposed between the two electrode sheets 22, and the two spacers 21 are disposed at both end portions of the electrode sheets 22 in the longitudinal direction in a one-to-one correspondence manner, and support both end portions of the two electrode sheets 22 so that the two electrode sheets 22 do not contact each other. The electrode sheet 22 is made of a conductive material such as graphite or metal. Of course, the shapes of the pads 21 and the electrode pieces 22 are not limited to the above description, for example, the pads 21 may be configured in a ring shape to support and separate the peripheries of the two electrode pieces 22, and the electrode pieces 22 may be configured in various shapes such as a square shape, an oval shape, and the like.
In the present exemplary embodiment, please continue to refer to fig. 3, a flexible substrate 23 is disposed on one side of each of the two electrode sheets 22 away from the gasket 21, that is, the flexible substrates 23 are disposed in two pieces, the electrode sheets 22 are completely covered by the flexible substrates 23, the flexible substrates 23 are made of plastic, filter paper, polyimide, or the like, and the flexible substrates 23 support the electrode sheets 22. Protective layers 24 are arranged on the surfaces, away from the gasket 21, of the two flexible substrates 23, namely the protective layers 24 are arranged into two pieces, the flexible substrates 23 are completely covered by the protective layers 24, the protective layers 24 are made of polydimethylsiloxane or rubber, and the protective layers 24 protect the electrode plates 22 and the flexible substrates 23. In addition, the flexible base material 23 may also be provided as one piece, and the shape of the flexible base material 23 is set as a cylinder to wrap the two electrode sheets 22 and the two gaskets 21; similarly, the protective layer 24 may be provided as one piece, and the shape of the protective layer 24 is set to be cylindrical to wrap the flexible substrate 23, the two electrode sheets 22, and the two gaskets 21.
Referring to a structural schematic diagram of the tremor sensor shown in fig. 4 after bending the piezoelectric portion 2 in fig. 1, the stacking direction of the piezoelectric portion 2 is perpendicular to the pressing direction of the button 3, one side surface of each of the two electrode sheets 22 abuts against the button 3, the other side surface of each of the two electrode sheets 22 opposite to the side surface abutting against the button 3 abuts against the inner wall surface of the bottom wall of the housing 1, and when the button 3 is pressed by tremor, the two electrode sheets 22 are both forced to bend. In the present exemplary embodiment, the longitudinal direction of the piezoelectric portion 2 coincides with the axial direction of the housing 1, that is, one end surface in the longitudinal direction of the piezoelectric portion 2 abuts against the inner wall surface of the bottom wall of the housing 1, and the other end surface in the longitudinal direction of the piezoelectric portion 2 abuts against one end surface of the push button 3 protruding into the housing 1. The Parkinson patient places the tremor fingers on the buttons 3, the patient generates pressure to the buttons 3 when the patient tremors, the buttons 3 transmit the pressure to the two electrode sheets 22 of the piezoelectric part 2, and the two electrode sheets 22 are bent under the action of the pressure. Referring to fig. 5, which is a schematic view of the structure of the piezoelectric portion 2 shown in fig. 1 after bending, the electrode pads 22 on both sides of the spacer 21 are bent in the same direction, and the electrode pads 22 located inside the bend have a smaller bending radius and a larger bending degree; the electrode sheet 22 located outside the bend has a larger bending radius and a smaller bending degree; thereby bringing the two electrode pads 22 into contact. The larger the amplitude of the chattering is, the larger the bending degree of the two electrode plates 22 is, the larger the contact area of the two electrode plates 22 is, and the smaller the resistance is; conversely, the smaller the amplitude of the chattering vibration, the smaller the pressure generated, the smaller the contact area of the two electrode sheets 22, and the larger the resistance. And the higher the frequency of chatter, the higher the frequency of resistance change; conversely, the smaller the frequency of chatter, the smaller the frequency of resistance change.
The housing 1, the button 3 and the spacer 21 may be made of insulating materials.
In the present exemplary embodiment, one protruding portion 4 is also fixed on the inner side wall of the housing 1, and the protruding portion 4 is located on the side of one of the electrode pads 22 close to the housing 1. The protruding part 4 can ensure that the two electrode plates 22 are both bent towards the same side, and the two electrode plates 22 can be contacted after being bent towards the same side; instead of the two electrode pieces 22 being bent in different directions, respectively, so that the two electrode pieces 22 cannot be in contact. The end of the protrusion 4 close to the piezoelectric part 2 is arc-shaped, so that the piezoelectric part 2 is prevented from being damaged when the protrusion 4 contacts the piezoelectric part 2.
Note that the abutting relationship between the push button 3 and the piezoelectric portion 2 is not limited to the above description, and for example, the push button 3 may abut against a surface of one of the electrode sheets 22 facing away from the pad 21. Reference is made to fig. 6, which is a schematic structural view of another embodiment of the tremor sensor of the present invention. In the present exemplary embodiment, the piezoelectric portion 2 may also include a spacer 21, two electrode sheets 22, two flexible substrates 23, and two protective layers 24. The two electrode sheets 22 are correspondingly arranged on two opposite side surfaces of the gasket 21 one to one, the two flexible base materials 23 are correspondingly arranged on one surfaces of the two electrode sheets 22, which are far away from the gasket 21, and the two protective layers 24 are correspondingly arranged on one surfaces of the two flexible base materials 23, which are far away from the gasket 21. The spacer 21 may be provided in a ring shape to support and separate the peripheries of the two electrode sheets 22, and the two electrode sheets 22, the two flexible substrates 23, and the two protective layers 24 may be provided in various shapes such as a circle or a square.
As shown in fig. 6, the stacking direction of the piezoelectric portion 2 is the same as the axial direction of the housing 1, that is, the stacking direction of the piezoelectric portion 2 is the same as the pressing direction of the push button 3, that is, the protective layer 24 abuts against the bottom wall of the housing 1, and the flexible substrate 23, the electrode sheet 22, the gasket 21, the electrode sheet 22, the flexible substrate 23, and the protective layer 24 are sequentially disposed on the protective layer 24 from bottom to top. The push button 3 abuts against a protective layer 24 located on the upper layer. Of course, in the case where the flexible base material 23 and the protective layer 24 are not provided, the push button 3 abuts against the electrode sheet 22 located on the upper layer. Referring to fig. 7, the tremor sensor in fig. 6 is shown in a structural schematic diagram after the piezoelectric part 2 is bent after receiving tremor; the Parkinson's disease patient places the trembled fingers on the buttons 3, the patient generates pressure to the buttons 3 during tremble, the buttons 3 transmit the pressure to the electrode plates 22 on the upper layer, the electrode plates 22 on the upper layer are stressed and bent to be in contact with the electrode plates 22 on the lower layer, the larger the tremble amplitude is, the larger the generated pressure is, the larger the contact area of the two electrode plates 22 is, and the smaller the resistance is; conversely, the smaller the amplitude of the chattering vibration, the smaller the pressure generated, the smaller the contact area of the two electrode sheets 22, and the larger the resistance. And the higher the frequency of chatter, the higher the frequency of resistance change; conversely, the smaller the frequency of chatter, the smaller the frequency of resistance change.
The Parkinson's disease patient exerts pressure to button 3 in the finger tremor process, and button 3 receives the pressure that the tremor produced and transmits pressure to electrode slice 22, and electrode slice 22 changes area of contact under the pressure effect in order to change resistance. The tremor amplitude and frequency of the fingers of the Parkinson's disease patient are detected through resistance change, and the device is noninvasive and nondestructive without blood drawing examination; the period is short, the tremor index with real time and high accuracy can be provided for doctors, and the detection equipment has simple structure and low cost.
Further, the invention also provides a tremor detection device, and the reference is made to a structural schematic block diagram of an embodiment of the tremor detection device of the invention shown in fig. 8. The tremor detection device may include a detection circuit and the tremor sensor 5 described above; the specific structure of the tremor sensor 5 has been described in detail above and, therefore, will not be described in detail here. The detection circuit is electrically connected to the two electrode pads 22 for detecting the resistance of the tremor sensor 5 or the current through the tremor sensor 5.
In the present exemplary embodiment, reference is made to fig. 9 showing a schematic structural view of the connection of the electrode pads with the power supply and the ammeter in the tremor detection apparatus of the present invention; the detection circuit can comprise a power supply 6 and an ammeter 7, wherein the positive electrode and the negative electrode of the power supply 6 are electrically connected to the two electrode plates 22 in a one-to-one correspondence manner; ammeter 7 is electrically connected between power supply 6 and electrode sheet 22, that is, ammeter 7 is connected in series with power supply 6 and electrode sheet 22. The current passing through the electrode sheet 22 is detected by the ammeter 7. Under the condition of constant voltage, the larger the resistance is, the smaller the current is; conversely, the smaller the resistance, the greater the current. Referring to the schematic diagram of the current change during tremor pressing shown in fig. 10, the trough position in the diagram is the state of minimum current, i.e. the state of maximum resistance, and at this time, the two electrode sheets 22 are not in contact. The peak position in the figure is a state where the current is maximum, that is, a state where the resistance is minimum, and at this time, the two electrode sheets 22 are in contact. Moreover, the larger the current value at the peak, the smaller the resistance at this time, the larger the contact area of the two electrode plates 22, and the larger the tremor amplitude of the patient's finger; conversely, the smaller the current value at the peak, the larger the resistance at that time, the smaller the contact area of the two electrode sheets 22, and the smaller the tremor amplitude of the patient's finger. Also, the more times a peak occurs per unit time, the higher the tremor frequency of the patient's finger; conversely, a lesser number of peaks occurring per unit time indicates a lower frequency of tremors in the patient's finger.
In addition, the detection circuit can also be used as a resistance detector. Directly judge tremble frequency and amplitude through resistance, specifically: the smaller the resistance is, the larger the contact area of the two electrode plates 22 is, and the larger the tremor amplitude of the fingers of the patient is; conversely, the larger the resistance, the smaller the contact area of the two electrode pads 22, and the smaller the tremor amplitude of the patient's finger. Also, the greater the number of valleys that occur per unit time, the higher the tremor frequency of the patient's fingers; conversely, a lesser number of valleys occurring per unit time indicates a lower frequency of tremors in the patient's fingers.
In the present exemplary embodiment, the tremor detection apparatus may further include a signal processor 8, an amplifier 9, and a wireless transmitter 10, the signal processor 8 being electrically connected to the ammeter 7 or the resistance detector, the amplifier 9 being electrically connected to the signal processor 8; the wireless transmitter 10 is electrically connected to the amplifier 9.
The signal processor 8 can be a single chip microcomputer, the single chip microcomputer can convert the detected analog signals into digital signals, and current values are extracted once every second, so that a time-current change schematic diagram (the abscissa is time, the unit is second; the ordinate ADC is a numerical value obtained after the current is subjected to analog-to-digital conversion) of slight tremor shown in fig. 11 is formed, wherein the tremor amplitude in the diagram is small, and the tremor amplitude indicates that the patient has a light degree of illness; FIG. 12 is a graph showing the time-current variation of severe tremor (abscissa is time in seconds; ordinate ADC is the value of the current after analog-to-digital conversion), in which the tremor amplitude is large, indicating that the patient is more ill; FIG. 13 is a graph showing the time-current variation of very severe tremor (abscissa is time in seconds; ordinate ADC is the value of the current after analog-to-digital conversion), in which the tremor amplitude is very large, indicating that the patient is seriously ill.
Hand tremor stage data (tremor amplitude and frequency within one minute) of typical healthy, early-stage parkinson's disease, severe parkinson's disease and very severe parkinson's disease can be stored in the single chip microcomputer, and the single chip microcomputer can also compare the detected value with the stored standard value to determine the degree and stage of the patient suffering from the disease. The tremor detection apparatus may further include a display, an input of which is electrically connected to an output of the signal processor 8, and the display directly displays the degree and stage of the patient's illness for reference by the patient and the doctor.
The wireless transmitter 10 can be bluetooth, various wireless transmission devices, and the wireless transmitter 10 can perform data interaction with mobile terminals and electronic devices in hospitals. For example, the electronic device may be a printer, and the patient may print the test results via the printer; the medical doctor can access the server through a computer of the doctor to call the detection result of the patient.
The tremor detection equipment can also comprise an alarm, the input end of the alarm is electrically connected with the output end of the signal processor 8, and the alarm can remind a detected person to timely carry out medical treatment.
Compared with the prior art, the beneficial effects of the tremor detection apparatus provided by the embodiment of the present invention are the same as the beneficial effects of the tremor sensor 5 provided by the above embodiment, and are not described herein again.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, and the features discussed in connection with the embodiments are interchangeable, if possible. In the above description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "top", "bottom", and the like, are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
In this specification, the terms "a", "an", "the" and "the" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the description. The invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for carrying out the invention and will enable those skilled in the art to utilize the invention.
Claims (10)
1. A tremor sensor, comprising:
a housing having a through hole formed therein;
the button is movably arranged in the through hole;
the piezoelectric part is arranged in the shell and abutted to the button, the piezoelectric part comprises a gasket and two electrode plates which are arranged on two opposite side faces of the gasket in a one-to-one correspondence mode, the button receives pressure generated by tremor and transmits the pressure to the electrode plates, and the contact area of the two electrode plates is changed under the action of the pressure to change the resistance.
2. The tremor sensor of claim 1, wherein the piezoelectric portion further comprises:
the flexible base material is arranged on one surface of the electrode plate, which deviates from the gasket.
3. The tremor sensor of claim 2, wherein the piezoelectric portion further comprises:
and the protective layer is arranged on one surface of the flexible substrate, which deviates from the gasket.
4. The tremor sensor of claim 3, wherein the flexible substrate is made of plastic, filter paper, or polyimide, the protective layer is made of polydimethylsiloxane or rubber, and the electrode pads are made of graphite or metal.
5. The tremor sensor of claim 1, wherein the piezoelectric portion is laminated in a direction perpendicular to the direction of pressure applied to the buttons, and one side surface of both of the electrode pads abuts against the buttons.
6. The tremor sensor of claim 5, further comprising:
and the protruding part is fixed on the inner side wall of the shell and is positioned on one side of the electrode plate close to the shell.
7. The tremor sensor of claim 1 wherein the button abuts a face of one of the electrode pads facing away from the spacer.
8. A tremor detection device, comprising:
a tremor sensor according to any of claims 1 to 7;
and the detection circuit is electrically connected to the two electrode plates.
9. The tremor detection device of claim 8, wherein the detection circuit includes:
the positive and negative electrodes of the power supply are electrically connected to the two electrode plates in a one-to-one corresponding manner;
and the ammeter is connected with the power supply and the electrode plate in series.
10. The tremor detection device of claim 8, wherein the tremor detection device further comprises:
the signal processor is electrically connected with the detection circuit;
the amplifier is electrically connected with the signal processor;
and the wireless transmitter is electrically connected with the amplifier.
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