Tooth cleaning target area acquisition system, method, and oral cleaning tool

Abstract

This application discloses a system, method, and oral hygiene tool for acquiring target areas for teeth cleaning. The system includes a sensing module and a data processing module. The sensing module comprises multiple sensing units arranged in an array to form an array sensing unit. The array sensing units are used to obtain multiple electrical signal changes relative to the human body during cleaning in real time. The input end of the data processing module is connected to the output end of the array sensing unit. The data processing module is used to acquire multiple electrical signal changes and calculate the orientation angle of the sensing module relative to the human oral cavity based on these changes. By setting multiple sensing units arranged in an array to form an array sensing unit, the electrical signal changes obtained by the multiple sensing units are more accurate. Users can determine which areas have not been cleaned based on the real-time orientation angle, and then perform further cleaning in the current or next cleaning session to prevent dental problems.

Description

[Technical Field]

[0001] This invention relates to the field of smart toothbrush technology, and more particularly to a system, method, and oral cleaning tool for acquiring target areas for tooth cleaning. [Background Technology]

[0002] Oral hygiene tools are daily necessities used to clean teeth. However, research shows that most people's oral hygiene practices are not standardized, resulting in ineffective cleaning. Cleaning standards vary from person to person due to differences in age, oral condition, and other factors. However, when using electric toothbrushes, certain areas may sometimes be missed, leading to dental health problems. Currently, there is no good method to identify which specific areas have not been cleaned. [Summary of the Invention]

[0003] In view of this, the present invention provides a system, method and oral cleaning tool for acquiring target areas for tooth cleaning, so as to obtain real-time cleaning area data during the cleaning process.

[0004] The specific technical solution of the first embodiment of the present invention is as follows: a tooth cleaning target area acquisition system, applied to an electric oral cleaning tool, the system comprising: a sensing module and a data processing module; the sensing module includes multiple sensing units, which are arranged in an array to form an array sensing unit, the array sensing unit being used to obtain multiple electrical signal changes relative to the human body during cleaning in real time; the input end of the data processing module is connected to the output end of the array sensing unit, the data processing module being used to obtain the multiple electrical signal changes and calculate the orientation angle of the sensing module relative to the human oral cavity based on the multiple electrical signal changes.

[0005] Preferably, the system further includes a motion sensing module, which is electrically connected to the data processing module. The motion sensing module obtains three-dimensional spatial motion feature data of the electric oral cleaning tool based on the orientation angle.

[0006] Preferably, the sensing module further includes a first electrode shielding unit, which is located inside the array sensing unit and is used to shield interference signals generated between multiple sensing units.

[0007] Preferably, the sensing module further includes a second electrode shielding unit, which is located on one side of the array sensing unit and is used to shield interference signals generated between multiple sensing units.

[0008] Preferably, the central axis of the sensing unit intersects with the central axis of the array sensing unit.

[0009] Preferably, the sensing module includes four sensing units, which are arranged in a ring array.

[0010] Preferably, it also includes a swing amplitude setting module, the input end of which is connected to the data processing unit, and the output end of which is connected to the motor of the electric toothbrush. The swing amplitude setting module has preset working frequency signals for different orientation angles. The swing amplitude setting module receives the orientation angle and sends the corresponding working frequency signal to the motor. The motor controls the brush head to work according to the working frequency signal.

[0011] Preferably, it further includes a pressure sensing module and a pressure setting module; the output end of the pressure sensing module is connected to the input end of the pressure setting module, and the pressure sensing module is used to obtain the contact pressure of the brush head against the teeth; the input end of the pressure setting module is also connected to the data processing unit, and the output end of the pressure setting module is connected to the user terminal; the pressure setting module presets pressure values ​​for different orientation angles, obtains the pressure value according to the orientation angle, obtains pressure adjustment parameters according to the pressure value and the contact pressure, and sends the pressure adjustment parameters to the user terminal.

[0012] The specific technical solution of the second embodiment of the present invention is as follows: a method for obtaining a target area for teeth cleaning, the method comprising: a sensing module including multiple sensing units, the multiple sensing units being arranged in an array to form an array sensing unit, the array sensing unit obtaining multiple electrical signal changes in the distance of the sensing unit relative to the human body during cleaning in real time; a data processing module obtaining the multiple electrical signal changes, and calculating the orientation angle of the sensing module relative to the human oral cavity based on the multiple electrical signal changes.

[0013] The specific technical solution of the third embodiment of the present invention is as follows: an electric oral cleaning tool, including a tooth cleaning target area acquisition system as described in any one of the first embodiments of this application.

[0014] Implementing the embodiments of the present invention will have the following beneficial effects:

[0015] This system utilizes multiple sensing units arranged in an array to obtain real-time changes in electrical signals relative to the human body during cleaning. A data processing module acquires these changes and calculates the orientation angle of the sensing unit relative to the oral cavity. By arranging multiple sensing units in an array, the obtained electrical signal changes are more accurate. Users can determine which areas have not been cleaned based on the real-time orientation angle, allowing for more thorough cleaning during the current or next cleaning session and preventing dental problems. [Attached Image Description]

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the system for acquiring target areas for teeth cleaning;

[0018] Figure 2 This is a schematic diagram of the motion sensing module structure;

[0019] Figure 3 This is a graph showing the change in electrical signal.

[0020] Figure 4 This is a schematic diagram of the first electrode shielding unit;

[0021] Figure 5 This is a schematic diagram of the second electrode shielding unit;

[0022] Figure 6 A schematic diagram showing the combination of the first electrode shielding unit and the second electrode shielding unit;

[0023] Figure 7 Schematic diagram of the module for setting swing amplitude;

[0024] Figure 8 This is a diagram illustrating the area where the toothbrush moves.

[0025] Figure 9 Schematic diagram of pressure sensing module and pressure setting module;

[0026] Figure 10 Flowchart of the steps for obtaining the target area for teeth cleaning.

[0027] Among them, 101 is the sensing module; 102 is the data processing module; 103 is the motion sensing module; 104 is the first electrode shielding unit; 105 is the second electrode shielding unit; 106 is the swing amplitude setting module; 107 is the pressure sensing module; and 108 is the pressure setting module.

Detailed Implementation Methods

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] The terms "first," "second," etc., used in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to such processes, methods, products, or apparatus.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] Please see Figure 1 This is a schematic diagram of a tooth cleaning target area acquisition system according to the first embodiment of this application, applied to an electric toothbrush. The tooth cleaning target area acquisition system includes: a sensing module 101 and a data processing module 102; the sensing module 101 includes multiple sensing units 101, which are arranged in an array to form an array sensing unit. The array sensing unit is used to obtain multiple electrical signal changes relative to the distance of the sensing unit 101 to the human body in real time during cleaning; the input end of the data processing module 102 is connected to the output end of the array sensing unit, and the data processing module 102 is used to obtain the multiple electrical signal changes and calculate the orientation angle of the sensing module relative to the human oral cavity based on the multiple electrical signal changes.

[0032] The change in electrical signal can include changes in capacitance, infrared light transmission and reception time difference, ultrasonic transmission and reception time difference, and electrical signals converted from ranging sensor signals. The sensing unit 101 is not limited to a capacitive sensor, but also includes infrared ranging sensors, SAR proximity sensors, ToF ranging sensors, laser ranging sensors, ultrasonic distance sensors, millimeter-wave antennas, etc. The sensor of the sensing unit 101 is not further limited here, and can be one or a combination of several of them.

[0033] Specifically, the sensing unit 101 is mainly used for capacitive sensing. The sensing unit 101 acts as an electrode plate or a sensing antenna, and the detected target acts as the other electrode plate of the capacitor, according to the expression: C = ε0 * ε r *Ad, where C is the capacitance of the sensing unit, ε0 and ε r Let A be the dielectric constant, A be the sensing area of ​​the sensing unit, and d be the relative distance between the sensing unit and the object being detected. Because the relative distance between different body parts and the toothbrush varies, the capacitance sensed by the sensing unit 101 will also differ for different cleaning areas. During the cleaning process, various body parts are the targets being detected. In this system, due to the human body's electric field, when different body parts approach the sensing unit, they couple with the sensing unit, creating a capacitance. At this time, the sensing unit can sense the corresponding change in capacitance. Simultaneously, during the cleaning process, the position of the toothbrush constantly changes, and the relative distance between different body parts and the sensing unit also changes. That is, when the relative distance d between the electrode plates of the corresponding capacitor changes, according to the expression: C = ε0 * ε r *Ad, the capacitance of the corresponding capacitor also changes.

[0034] When the sensing unit 101 is a millimeter-wave antenna, the millimeter-wave antenna is installed near the annular shell of the electric oral cleaning tool at different azimuth angles, presenting a spatial layout that generates two beams in different directions. The beams can have some overlap, but the maximum gain points of the two beam centers form a certain required angle. For electric toothbrushes, water flossers, smart dental floss, and other electric oral cleaning tools, an axisymmetric distribution is usually adopted, such as two beams at a 180-degree angle, three beams at a 120-degree angle, and four beams at a 90-degree angle. However, different combinations of angles can be adjusted according to the actual product's requirements for sensing accuracy in different directions, resulting in a ring-shaped distribution around the central axis of the shell, but not completely symmetrical, forming an antenna array ring. Multiple beams can calculate the azimuth angle of the human body relative to the annular shell of the electric oral cleaning tool, and based on the angle between the front of the electric oral cleaning tool and the measured azimuth angle of the human body, determine the actual posture of the human body using the electric oral cleaning tool, thereby locating the target area where the electric oral cleaning tool is performing its task, such as locating which tooth the brush head is cleaning when using an electric toothbrush. While determining the azimuth and orientation angles, the distance relationship between the human body and the electric oral cleaning tool can also be determined based on the signal strength characteristics. This allows for further calculation of a more precise location of the target area where the electric oral cleaning tool is performing its task. Array-type millimeter-wave antennas can be combined with multiple single-antenna or multi-antenna millimeter-wave transceiver modules to achieve millimeter-wave radar systems with broader azimuth and orientation angle coverage.

[0035] For details, please participate. Figure 2The system also includes a motion sensing module 103, which is electrically connected to the data processing module 102. The motion sensing module 103 includes at least one of a three-axis linear accelerometer, a three-axis gyroscope, and a three-axis magnetometer. The motion sensing module 103 obtains three-dimensional spatial motion characteristic data of the electric oral cleaning tool based on the orientation angle. The motion sensing module, combined with the orientation angle obtained by the sensing module, provides a human body orientation reference coordinate system for the three-dimensional motion characteristic data, improving the accuracy of the three-dimensional motion characteristic data calculation.

[0036] This system utilizes multiple sensing units arranged in an array to obtain real-time changes in electrical signals relative to the human body during cleaning. A data processing module acquires these changes and calculates the orientation angle of the sensing module relative to the oral cavity. By arranging multiple sensing units in an array, the obtained electrical signal changes are more accurate. Users can determine which areas have not been cleaned based on the real-time orientation angle, allowing for more thorough cleaning during the current or next cleaning session and preventing dental problems.

[0037] In a specific embodiment, one or more sensing modules 101 may be installed according to actual design needs, and may be installed in different positions inside the toothbrush handle according to actual design.

[0038] In a specific embodiment, the sensing module 101 includes four sensing units arranged in a ring array. Specifically, each sensing unit can be a single-ring electrode, and the four sensing units arranged in a ring array form a ring shape. The single-ring sensing unit and the ring array design achieve optimal accuracy in identifying the orientation angle of the sensing unit relative to the human body, thereby enabling the identification of more detailed orientation angles such as clean outer surfaces, inner surfaces, upper tooth occlusal surfaces, and lower occlusal surfaces. The shape of the sensing units and the array arrangement can also be designed in other ways; no specific limitations are imposed here. The four sensing units are arranged in pairs to form a capacitor. Since the orientation of the human body near the sensing units is not fixed, it will affect each of the four sensing units, causing changes in their electrical signals. Based on the relative magnitudes of the electrical signals formed by the four sensing units, the orientation position relationship of the human body among the four sensing units can be obtained. For details, please refer to [link to relevant documentation]. Figure 3 The electrical signals obtained by the four sensing units are C15, C25, C35, and C45, respectively, by... Figure 3 It can be seen that the electrical signals obtained by different sensing units change with the orientation angle of the sensing unit relative to the human body, thereby obtaining the amount of change in electrical signals.

[0039] In a specific embodiment, please refer to Figure 4The sensing module 101 also includes a first electrode shielding unit 104, which is located inside the array sensing unit. The electrode shielding unit is used to shield interference signals generated between multiple sensing units. Specifically, the shape of the first electrode shielding unit 104 can be designed according to actual conditions and is not specifically limited here. For example, it can be an annular closed ring electrode. One end of the first electrode shielding unit 104 is grounded to achieve better anti-interference performance.

[0040] In a specific embodiment, please refer to Figure 5 The sensing module 101 also includes a second electrode shielding unit 105, which is located on one side of the array sensing unit. The electrode shielding unit is used to shield interference signals generated between multiple sensing units. Specifically, the shape of the second electrode shielding unit 105 can be designed according to actual conditions and is not specifically limited here. For example, it can be a closed annular electrode, with one end grounded to achieve better anti-interference performance. In particular, the second electrode shielding unit 105 can also be designed as an integral part of the array sensing unit, forming a complete ring signal combination. This complete ring signal combination can improve the shielding capability of the second electrode against interference signals and improve the accuracy of system identification.

[0041] In a specific embodiment, please refer to Figure 6 The sensing module 101 may also include a first electrode shielding unit 104 and a second electrode shielding unit 105, and the first electrode shielding unit 104 and the second electrode shielding unit 105 are grounded to form a ground shielding protection. Electrode shielding units are provided inside and on one side of the array sensing unit to further improve the anti-interference capability of the system.

[0042] In a specific embodiment, the central axis of the sensing unit intersects with the central axis of the array sensing unit. Specifically, the sensing unit is placed at an angle, parallel to the tapered toothbrush handle shell, thereby better conforming to the tapered characteristics of the toothbrush handle shell and improving the accuracy of orientation angle recognition.

[0043] In a specific embodiment, please refer to Figure 7 It also includes a swing amplitude setting module 106. The input end of the swing amplitude setting module 106 is connected to the data processing unit, and the output end of the swing amplitude setting module 106 is connected to the motor of the electric toothbrush. The swing amplitude setting module presets working frequency signals for different orientation angles. The swing amplitude setting module receives the orientation angle and sends the corresponding working frequency signal to the motor. The motor controls the brush head to work according to the working frequency signal.

[0044] For details, please refer to Figure 8The cleaning process can be broken down into 16 zones based on orientation angle: upper left, lower left, lower left inner, upper left inner, lower left outer, upper left outer, upper right, lower right, lower right inner, upper right inner, lower right outer, upper right outer, upper middle inner, lower middle inner, lower middle inner, lower middle inner, and lower middle outer. By setting corresponding operating frequency signals for each of these 16 zones, the oscillation amplitude setting module receives the orientation angle and sends the corresponding operating frequency signal to the motor. The motor then controls the brush head's operation based on the operating frequency signal. For example, the lower left inner zone typically corresponds to the molar area. When the area is identified as a molar area, the motor power is increased, controlling the motor's oscillation to achieve the target operating frequency, thus improving the cleaning ability.

[0045] In a specific embodiment, please refer to Figure 9 It also includes a pressure sensing module 107 and a pressure setting module 108. The output of the pressure sensing module 107 is connected to the input of the pressure setting module 108, and the pressure sensing module 107 is used to obtain the contact pressure of the brush head against the teeth. The input of the pressure setting module 108 is also connected to a data processing unit, and the output of the pressure setting module 108 is connected to a user terminal. The pressure setting module 108 presets pressure values ​​for different orientation angles. The pressure setting module obtains the pressure value based on the orientation angle, and obtains pressure adjustment parameters based on the pressure value and the contact pressure, and sends the pressure adjustment parameters to the user terminal. Specifically, the pressure sensing module obtains the contact pressure of the brush head against the teeth, the pressure setting module sets pressure values ​​for 16 orientation angles, obtains the pressure value based on the orientation angle, obtains pressure adjustment parameters based on the pressure value and the contact pressure, and sends the pressure adjustment parameters to the user terminal to adjust the cleaning intensity. In particular, individual cleaning strategies can also be set in 16 areas, such as implementing a specific cleaning strategy for dental implant sites.

[0046] In a specific embodiment, the user terminal is a voice broadcast module, which obtains the orientation angle in real time and broadcasts it to the user. The voice broadcast provides real-time reminders to the user to adjust the cleaning intensity, thereby achieving the purpose of oral hygiene.

[0047] In one embodiment, the system also includes a cloud server. The cloud server obtains the orientation angle and presets standard toothbrush movement rules. The cloud server can compare the orientation angle with the standard toothbrush movement rules and model to obtain a comparative analysis result. The comparative analysis result is saved and sent to the display module, which can be used to view the comparative analysis result to determine whether its own cleaning habits are standard.

[0048] Specifically, the data processing module obtains the real-time orientation angle and sends it to the user's device. The user can then view the orientation angle to identify the toothbrush's movement area. Based on the real-time orientation angle, the user can determine which areas haven't been cleaned and perform further cleaning during the current or next cleaning session, preventing dental problems. Simultaneously, the toothbrush can be equipped with user-friendly features such as light prompts, voice prompts, and a display module, which can guide the user through proper cleaning. After cleaning is complete, a data analysis report of the entire cleaning process's orientation angle can be generated and output to the user to guide the next cleaning session.

[0049] For the same purpose, please refer to Figure 10 This is a flowchart illustrating the steps of a method for obtaining a target area for teeth cleaning according to a second embodiment of this application. The method includes:

[0050] Step 1001: The sensing module 101 includes multiple sensing units, which are arranged in an array to form an array sensing unit. The array sensing unit obtains multiple electrical signal changes in the distance between the sensing unit and the human body during cleaning in real time.

[0051] Step 1002: The data processing module 102 acquires the multiple electrical signal changes and calculates the orientation angle of the sensing module relative to the human oral cavity based on the multiple electrical signal changes.

[0052] Specifically, the sensing unit is mainly used for capacitive sensing. The sensing unit acts as an electrode plate or sensing antenna, and the detected target acts as the other electrode plate of a capacitor, according to the expression: C = ε0 * ε r *Ad, where C is the capacitance of the sensing unit, ε0 and ε r Let A be the dielectric constant, A be the sensing area of ​​the sensing unit, and d be the relative distance between the sensing unit and the object being detected. Because the relative distance between different body parts and the toothbrush varies, the capacitance sensed by the sensing unit differs for different cleaning areas. During the cleaning process, various body parts are the targets being detected. In this system, due to the human body's electric field, when different body parts approach the sensing unit, they couple with the sensing unit, creating a capacitance. The sensing unit can then sense the corresponding change in capacitance. Simultaneously, during cleaning, the toothbrush position changes continuously, and the relative distance between different body parts and the sensing unit also changes. That is, when the relative distance d between the electrode plates of the corresponding capacitor changes, according to the expression: C = ε0 * ε r *Ad, the capacitance of the corresponding capacitor also changes.

[0053] This method utilizes an array of multiple sensing units to obtain real-time electrical signal changes relative to the human body during cleaning. A data processing module acquires these electrical signal changes and calculates the orientation angle of the sensing module relative to the oral cavity. By using an array of sensing units, the obtained electrical signal changes are more accurate. Users can determine which areas have not been cleaned based on the real-time orientation angle, allowing for more thorough cleaning during the current or next cleaning session and preventing dental problems.

[0054] For the same purpose, a third embodiment of this application provides an electric oral cleaning tool, including a tooth cleaning target area acquisition system as described in any one of the first embodiments of this application. The tooth cleaning target area acquisition system can provide prompts regarding the user's current orientation angle, such as through voice, buzzer, or light signals. The user can correct the orientation angle recognition of the electric oral cleaning tool. For example, if the user believes the recognition is incorrect after receiving a prompt, such as the actual target area being the outer region of the upper right teeth but the electric oral cleaning tool has identified it as the outer region of the lower right teeth, the user can manually adjust the setting. The method of correction is not limited; for example, it can be corrected by touching a specific button or through voice input. After correction, the electric oral cleaning tool can record the capacitance information of the area and the corresponding corrected judgment result (the actual tooth cleaning target area). This can prevent misjudgment in the next judgment, improving the targeting and accuracy of the user's cleaning area recognition. The electric oral cleaning tool includes, but is not limited to, electric toothbrushes, electric water flossers, electric dental floss, electric dental abrasives, and electric dental polishers.

[0055] Simultaneously, the orientation angle can be identified by obtaining image recognition information based on the auxiliary recognition module. The current area image can be obtained based on the camera module. Similarly, by recognizing the current area image, it can be mainly used to determine the left-right and inside-out orientation of the electric oral cleaning tool. For example, it can identify: the left outer area of ​​the teeth, the right outer area of ​​the teeth, and the inner area (at this time, the electric toothbrush is facing outward, and it is difficult to determine left and right by image recognition alone), or: the outer area of ​​the upper left teeth, the outer area of ​​the lower left teeth, the outer area of ​​the upper right teeth, the outer areas of the lower left and right teeth, and the inner area (at this time, the electric toothbrush is facing outward, and it is difficult to determine left and right by image recognition alone).

[0056] By using the electric oral cleaning tool provided in this embodiment, multiple sensing units arranged in an array can be used to obtain multiple electrical signal changes relative to the human body during cleaning. The data processing module acquires these multiple electrical signal changes and calculates the orientation angle of the sensing module relative to the human oral cavity based on these changes. By setting multiple sensing units in an array, the electrical signal changes obtained by the multiple sensing units are more accurate. Users can determine which areas have not been cleaned based on the real-time orientation angle, and then perform further cleaning in the current or next cleaning session to prevent dental problems.

[0057] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A tooth cleaning target area acquisition system applied to an electric oral cleaning tool, characterized by, The system includes: a sensing module and a data processing module; The sensing module includes multiple sensing units, which are arranged in an array to form an array sensing unit. The array sensing unit is used to obtain multiple electrical signal changes in the distance between the sensing unit and the human body during cleaning in real time. The input end of the data processing module is connected to the output end of the array sensing unit. The data processing module is used to acquire the multiple electrical signal changes and calculate the orientation angle of the sensing module relative to the human oral cavity based on the multiple electrical signal changes. The sensing module further includes a first electrode shielding unit, which is located inside the array sensing unit. The electrode shielding unit is used to shield interference signals generated between multiple sensing units. The first electrode shielding unit is an annular closed ring electrode, and one end of the first electrode shielding unit is grounded. The sensing module also includes a second electrode shielding unit, which is located on one side of the array sensing unit. The electrode shielding unit is used to shield the interference signals generated between multiple sensing units. The second electrode shielding unit is a ring-shaped closed ring electrode, one end of which is grounded. The second electrode shielding unit is also designed as an integral part of the array sensing unit to form a complete ring signal combination. The central axis of the sensing unit intersects with the central axis of the array sensing unit, and the sensing unit is placed at an angle, parallel to the conical toothbrush handle housing.

2. The dental cleaning target area acquisition system of claim 1, wherein: The system also includes a motion sensing module, which is electrically connected to the data processing module. The motion sensing module obtains the three-dimensional spatial motion feature data of the electric oral cleaning tool based on the orientation angle.

3. A dental cleaning target area acquisition system according to claim 1 or 2 wherein: The sensing module contains four sensing units, which are arranged in a ring array.

4. The dental cleaning target area acquisition system of claim 1 or 2, wherein: It also includes a swing amplitude setting module. The input end of the swing amplitude setting module is connected to the data processing module, and the output end of the swing amplitude setting module is connected to the motor of the electric toothbrush. The swing amplitude setting module presets working frequency signals for different orientation angles. The swing amplitude setting module receives the orientation angle and sends the corresponding working frequency signal to the motor. The motor controls the brush head to work according to the working frequency signal.

5. The dental cleaning target area acquisition system of claim 1 or 2, wherein: It also includes a pressure sensing module and a pressure setting module; The output of the pressure sensing module is connected to the input of the pressure setting module. The pressure sensing module is used to obtain the contact pressure of the brush head against the teeth. The input end of the pressure setting module is also connected to the data processing module, and the output end of the pressure setting module is connected to the user terminal. The pressure setting module presets pressure values ​​for different orientation angles. The pressure setting module obtains the pressure value based on the orientation angle, and obtains pressure adjustment parameters based on the pressure value and the contact pressure, and sends the pressure adjustment parameters to the user terminal.

6. A tooth cleaning target area acquisition method applied to the tooth cleaning target area acquisition system according to claim 1, characterized by, The method includes: The sensing module contains multiple sensing units, which are arranged in an array to form an array sensing unit. The array sensing unit obtains multiple electrical signal changes in the distance between the sensing unit and the human body in real time during cleaning. The data processing module acquires the multiple electric signal change amounts, and calculates a direction angle of the sensing module relative to the oral cavity of the human body according to the multiple electric signal change amounts.

7. An electric oral cleaning tool, characterized by: A dental cleaning target area acquisition system comprising the system according to any one of claims 1-5.

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