Electric toothbrush

Abstract

The utility model discloses an electric toothbrush which comprises a brush head assembly and a handle assembly, the handle assembly comprises a handle cylinder and a driving motor located in the handle cylinder, the driving motor comprises a stator module, a rotor module and a driving shaft, the rotor module is rotatably connected with the stator module, and the driving shaft is fixed with the rotor module. The stator module and the rotor module are in mutual magnetic fit, part of the driving shaft extends out of the handle cylinder, and the brush head assembly is connected with the driving shaft; the handle assembly is provided with a plurality of working gears, and the rotation angle ranges of the driving shaft under different working gears are different; or the rotating angle of the driving shaft is adjustable; wherein the handle assembly has an awakening state, and in the awakening state, the driving motor has electromagnetic force for keeping the driving shaft fixed relative to the handle assembly. According to the technical scheme, when a user wants to use the electric toothbrush to manually brush the oral cavity, the brush head of the electric toothbrush cannot rotate, so that the use requirements of different users are met, and the experience feeling of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oral cleaning appliances, in particular to an electric toothbrush. Background Art

[0002] The driving motor of a traditional electric toothbrush usually has a mechanical limit, and the cleaning swing angle cannot be adjusted, which results in the swing angle / amplitude of the electric toothbrush being relatively unchanged or changing slightly (the swing amplitude of the bristles changes due to the change in driving force);

[0003] In the current related technologies, the design concept of electric toothbrushes is constantly innovating to meet higher-level cleaning needs and user experience. In order to increase the swing angle of the electric toothbrush, a drive motor without mechanical limit is used. This design allows the swing angle adjustment range of the drive shaft of the drive motor to be larger, thereby providing users with a richer cleaning mode.

[0004] However, in actual use, this kind of drive motor without mechanical limit also brings some troubles. If the user wants to use the electric toothbrush manually, for example, manually use the brush head of the electric toothbrush to brush the tongue, the brush head will rotate. Because the original design of the electric toothbrush is to achieve automatic cleaning, when used manually, the rotation of the brush head will lead to poor cleaning effect and may even damage the teeth and gums. In order to solve this problem, it is necessary to study an electric toothbrush that can meet the requirements of large swing angles and can be used manually. Utility Model Content

[0005] The main purpose of the utility model is to provide an electric toothbrush, which is intended to meet the demand of the user that the brush head of the electric toothbrush does not rotate when the user wants to use the electric toothbrush to manually brush the oral cavity.

[0006] To achieve the above-mentioned purpose, the electric toothbrush proposed by the utility model comprises:

[0007] a brush head assembly; and

[0008] A handle assembly, the handle assembly includes a handle barrel and a drive motor located in the handle barrel, the drive motor includes a stator module, a rotor module and a drive shaft, the rotor module is rotatably connected to the stator module, the drive shaft is fixed to the rotor module, the stator module and the rotor module are magnetically matched with each other, a portion of the drive shaft extends from the handle barrel, and the brush head assembly is connected to the drive shaft;

[0009] The handle assembly has a plurality of working gears, and the rotation angle range of the drive shaft is different in different working gears; or, the rotation angle of the drive shaft is adjustable;

[0010] Wherein, the handle assembly has an awake state, and in the awake state, the drive motor has an electromagnetic force to keep the drive shaft fixed relative to the handle assembly.

[0011] Optionally, the handle assembly further has a standby state, in which the drive shaft can rotate relative to the handle assembly;

[0012] The handle assembly also includes a control module and a sensing module. The control module is electrically connected to the drive motor, and the sensing module is electrically connected to the control module. When the sensing module is triggered, the handle assembly switches from the standby state to the wake-up state. The control module controls the drive motor to generate electromagnetic force to fix the drive shaft relative to the handle assembly.

[0013] Optionally, the control module controls the drive motor in a preset manner to generate electromagnetic force at a preset position, so that the drive shaft remains fixed relative to the handle assembly at the preset position.

[0014] Optionally, the preset position is configured as an initial position of the drive shaft in a standby state;

[0015] Alternatively, the preset position is configured as a reference position when the drive shaft is oscillating;

[0016] Alternatively, the preset position is configured to be obtained by rotating a reference position when the drive shaft is controlled to swing in a preset manner.

[0017] Optionally, the fixed position of the drive shaft relative to the handle assembly is a holding position. When in the awakening state and the drive shaft deviates from the holding position, the drive shaft can be reset to the holding position under the action of the electromagnetic force.

[0018] Optionally, the handle assembly further includes an adjustment module, wherein the adjustment module is electrically connected to the control module, and the adjustment module is used to adjust the magnitude of the electromagnetic force.

[0019] Optionally, the regulating module is configured as a wireless communication module, the wireless communication module is electrically connected to the control module, and the control module adjusts the magnitude of the electromagnetic force after receiving a signal instruction through the wireless communication module.

[0020] Optionally, the electromagnetic force ranges from 3N to 10N.

[0021] Optionally, the handle assembly also has a working state, and the handle assembly also includes a position sensor for detecting the rotation angle of the drive shaft. When the electric toothbrush is in the working state, the control module controls the rotation of the drive shaft according to the rotation angle detected by the position sensor.

[0022] Optionally, the stator module drives the rotor module to drive the drive shaft to swing back and forth within a first angle range, and drives the drive shaft to rotate back and forth within a second angle range, the first angle range is smaller than the second angle range, and the swing frequency is greater than the rotation frequency.

[0023] Optionally, the handle assembly is in the awake state within a first preset time after the handle assembly is picked up and / or within a second preset time after the drive motor stops working.

[0024] Optionally, the handle assembly has a flight mode, and in the flight mode, the handle assembly:

[0025] The handle assembly will not switch from the standby state to the awakening state when the awakening condition is met; or, when the handle assembly is in the awakening state, the driving motor has no electromagnetic force.

[0026] In the technical solution of the utility model, the stator module and the rotor module are magnetically matched with each other, and the brush head assembly is connected to the drive shaft; the handle assembly has multiple working gears, and the rotation angle range of the drive shaft is different in different working gears; or, the rotation angle of the drive shaft is adjustable to meet the usage needs of different user groups; the handle assembly has a wake-up state, in which a constant current is passed through the drive motor, and the drive motor generates electromagnetic force through the coil, and the stator module and the rotor module are magnetically matched with each other, so that the drive shaft remains fixed relative to the handle assembly, so that when the user wants to use the electric toothbrush to manually brush the mouth, the brush head of the electric toothbrush will not rotate, so as to meet the usage needs of different users and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of an embodiment of the electric toothbrush of the utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the middle drive motor;

[0030] Figure 3 This is a structural diagram of the electric toothbrush of the utility model;

[0031] Figure 4A schematic diagram of the swing angle, reference position and preset position of the drive shaft in one embodiment of the utility model;

[0032] Figure 5 It is a schematic diagram of the swing angle, reference position and preset position of the driving shaft in another embodiment of the utility model.

[0033] Description of Figure Numbers:

[0034]

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0040] The utility model provides an electric toothbrush. In one embodiment of the utility model, Figures 1 to 5 As shown, the electric toothbrush 10 includes: a brush head assembly (not shown) and a handle assembly 20. The brush head assembly includes a brush head and bristles. The bristles are the part of the electric toothbrush 10 that contacts the teeth and are usually made of soft nylon bristles to effectively clean the tooth surface and the gum line.

[0041] Reference Figures 1 to 3 The handle assembly 20 includes a handle barrel, a drive motor 24 located in the handle barrel, a battery 70, a circuit board 25 and a sealing device (not shown in the figure). The handle barrel of the electric toothbrush 10 usually has waterproof and sealing functions to protect the internal circuit and motor from moisture intrusion. The handle of the electric toothbrush 10 is usually made of plastic material, which is the main body of the entire toothbrush. The electric toothbrush 10 usually uses a rechargeable battery 70, such as a lithium-ion battery 70. These batteries 70 have a long service life and can be charged by a charger. The drive motor 24 drives the vibration or rotation movement of the toothbrush through the energy provided by the power supply, thereby achieving a cleaning effect.

[0042] Reference Figure 2 The handle assembly 20 includes a handle tube and a drive motor 24 located in the handle tube, the drive motor 24 includes a stator module 242, a rotor module 243 and a drive shaft 241, the rotor module 243 is rotatably connected to the stator module 242, the drive shaft 241 is fixed to the rotor module 243, the stator module 242 and the rotor module 243 are magnetically matched with each other, part of the drive shaft 241 extends from the handle tube, and the brush head assembly is connected to the drive shaft 241.

[0043] There is usually a switch button 22 on the handle tube, which is connected to the circuit board 25 for controlling the switch and mode selection of the electric toothbrush 10. The circuit board 25 is usually located inside the handle of the electric toothbrush 10. The circuit board 25 integrates a control module 27, a wireless communication module 29, a power management module, etc. The circuit board 25 contains multiple electronic components, such as integrated circuits, resistors, capacitors, transistors, etc., to achieve specific functions.

[0044] Specifically, refer to Figure 4 and Figure 5 The handle assembly 20 has a plurality of working positions, and the rotation angle range of the drive shaft 241 is different in different working positions; or, the rotation angle of the drive shaft 241 is adjustable to meet the usage requirements of different user groups.

[0045] The switching of different working gears can be performed by means of a switch or a button, and the switch or button can be a physical button; or a virtual button.

[0046] Specifically, the control module 27 is responsible for receiving the electrical signal from the switch or button and transmitting the electrical signal to the motor to control its start and stop. The switch or button may also include other functions, such as triggering different cleaning modes or triggering a timer.

[0047] The circuit board 25 is integrated with a power management module for managing the power supply of the electric toothbrush 10 to ensure the service life and performance of the battery 70. For example, it includes a charging circuit, a battery 70 protection circuit, and a power converter.

[0048] The circuit board 25 is also electrically connected to other components, such as the drive motor 24, the charging device, the display screen 23, etc. Through the circuit connections on the circuit board 25, the various components can work together to achieve the normal operation of the electric toothbrush 10.

[0049] The driving motor 24 of a traditional electric toothbrush 10 usually has a mechanical limit, and the cleaning swing angle cannot be adjusted, which results in the swing angle 60 / amplitude of the electric toothbrush 10 being relatively unchanged, or changing very little (the change in the swing amplitude of the bristles is caused by the change in the driving force). This type of electric toothbrush 10 is difficult to meet the usage needs of a variety of users and is difficult to simulate the vibration brushing technique.

[0050] In order to solve this problem, in the related art, in order to increase the swing angle 60 of the electric toothbrush 10, a drive motor 24 without mechanical limit is adopted. Since the physical limit on the drive shaft 241 during the rotation process is cancelled, the drive shaft 241 of the drive motor 24 can rotate 360°, and is replaced by electronic limit, that is, when working, the rotation direction of the drive motor 24 is changed by applying the opposite electrical signal. There is a sensor on the drive motor 24 for detecting the rotation angle of the shaft, thereby realizing closed-loop control of the rotation angle and electronic limit, so that the swing angle 60 of the drive shaft 241 of the drive motor 24 has a larger adjustment range. However, if the user wants to use the electric toothbrush 10 manually, for example, manually use the brush head of the electric toothbrush 10 to brush the tongue coating, etc., the brush head will rotate and cannot meet the corresponding usage scenarios.

[0051] Reference Figure 3 and Figure 4 In this embodiment, the stator module 242 drives the rotor module 243 to drive the drive shaft 241 to swing back and forth within a first angle range 81, and drives the drive shaft 241 to rotate back and forth within a second angle range 82. The first angle range 81 is smaller than the second angle range 82, and the swing frequency is greater than the rotation frequency.

[0052] The driving motor 24 includes a rotor module 243 and a stator module 242. The stator module 242 can be arranged on the peripheral side of the rotor module 243, and the rotor module 243 is rotatably connected to the stator module 242. The stator module 242 and the rotor module 243 cooperate with each other magnetically to drive the rotor module 243 to rotate. The stator module 242 can include a permanent magnet or an electromagnet. The driving shaft 241 is fixed to the rotating module, and the driving shaft 241 is connected to the brush head. The rotational movement of the driving shaft 241 is divided into swinging and rotating. During the swinging process of the driving shaft 241, the teeth can be cleaned; and the rotation of the driving shaft 241 is mainly to adjust the reference position 50 of the driving shaft 241, that is, the driving motor 24 realizes the rotation of the driving shaft 241 by swinging the driving shaft 241. When the user's holding posture remains unchanged, the brush head can be deflected, and the swing angle 60 of the driving motor 24 has a larger adjustment range, so that a wider tooth surface can be covered, thereby improving the cleaning effect.

[0053] The following refers to the state, gear and mode of the electric toothbrush 10. When referring to the state, working gear and working mode of the electric toothbrush 10, the following are their definitions:

[0054] Status: The status of the electric toothbrush 10 generally indicates its current working status or function. Common statuses include on, off, and charging. In this embodiment, the electric toothbrush 10 also has the following three statuses:

[0055] Standby state: In the standby state, the electric toothbrush 10 is turned off and remains stationary when not in use, and the drive shaft 241 can rotate 360 ​​degrees under the action of external force. The electric toothbrush 10 is in a low power consumption mode and does not vibrate or work to extend the battery life. Usually, the electric toothbrush 10 in the standby state can be awakened by picking up the electric toothbrush, pressing the switch button, or connecting it to the charging base.

[0056] Awakening state: When the electric toothbrush 10 is awakened from the standby state, it enters the awakening state. In this state, the electric toothbrush 10 may have some simple reactions, such as lighting up an indicator light or making a sound, to indicate that it has been activated and is ready to start working, so that the user can easily identify and operate the electric toothbrush 10, or some of its standby electrical modules, such as the Bluetooth module, are switched to normal power consumption.

[0057] Working state: When the motor of the electric toothbrush 10 is in operation, it is in working state. In the working state, the electric toothbrush 10 begins to perform its designed function, usually vibrating or rotating to clean teeth. In the working state, the electric toothbrush 10 consumes energy, generates sound and vibration, and provides effective teeth cleaning. The working state may last for a preset period of time, or until the user actively turns off the electric toothbrush 10.

[0058] Regarding working gears: The electric toothbrush 10 generally has a plurality of working gears for controlling the vibration speed or intensity of the brush head, for example:

[0059] The lower setting generally indicates a gentler cleaning force, which is suitable for sensitive teeth or first-time users.

[0060] Gear 2 may provide medium cleaning power, which is suitable for most people's daily use.

[0061] Level 3 generally provides higher cleaning power and is suitable for situations where more powerful cleaning is required, such as areas with more plaque or where deep cleaning is required.

[0062] In other words, different gears can be different movement modes or operating forces (angle, frequency, duty cycle), which can be reflected as working gears on the electric toothbrush, or as the working modes described below.

[0063] The working gear of the present solution can be reflected as a gear on the electric toothbrush 10, such as including the strength of the motor, and can also be represented as a working mode on the electric toothbrush 10, that is, different movement strengths and movement methods. For example, when the working gear refers to the working mode, it can include at least some of the following modes:

[0064] Standard mode: This is the most common working mode and is suitable for daily teeth cleaning.

[0065] Deep Clean Mode: This mode provides stronger vibrations to clean deeply on the tooth surfaces and between teeth.

[0066] Massage mode: This mode usually uses gentler vibrations and is designed to massage the gums to stimulate blood circulation.

[0067] Airplane mode: This is a special mode in which the wireless function of the electric toothbrush 10 is disabled and the driving motor 10 is stopped. If the handle assembly meets the wake-up condition, it will not switch from the standby state to the wake-up state; or, when the handle assembly is in the wake-up state, the driving motor has no electromagnetic force.

[0068] In order to ensure that the brush head of the electric toothbrush 10 does not rotate when the user uses the electric toothbrush 10 to manually brush the oral cavity, the electric toothbrush 10 can continue to be used in the form of a common toothbrush.

[0069] Furthermore, the handle assembly 20 has an awake state, in which the drive motor 24 has an electromagnetic force that keeps the drive shaft 241 fixed relative to the handle assembly 20 .

[0070] In one embodiment, the handle assembly 20 is in a wake-up state within the first preset time after the handle assembly 20 is picked up. In one scenario, the wake-up state may be the process from the placement state of the electric toothbrush 10 to the user picking up the electric toothbrush 10, including but not limited to within 1s, 3s, and 5s, the electric toothbrush 10 enters the wake-up state, the drive motor 24 generates an electromagnetic force to make the drive shaft 241 relatively fixed, and ensure that the brush head will not rotate under the action of external force when the electric toothbrush 10 is used manually. The electromagnetic force that fixes the drive shaft 241 relative to the handle assembly 20 needs to be greater than the product of the brushing pressure and the friction coefficient u between the toothbrush head, u is less than 1, and the pressure is usually around 1.5~3N, that is, the electromagnetic force is at least greater than 3N, which can basically ensure that the brush head will not rotate under the action of external force during the brushing process. During the initial setting process, the electromagnetic force can be 4N, 5N, and 6N, which ensures that the user's manual brushing process has good stability and improves the user's experience.

[0071] In one embodiment, the handle assembly 20 is in the wake-up state within the second preset time after the drive motor 24 stops working. In one scenario, after turning off the electric toothbrush 10, the user may manually trigger a button to stop the drive motor 24, or the drive motor 24 may be preset with a working time, such as automatically stopping after two minutes, that is, after exiting the working state, if the electric toothbrush 10 is not put down within the second preset time, such as 5s or other preset time, then the wake-up state is entered.

[0072] In one embodiment, the handle assembly 20 is in a wake-up state within a first preset time when the handle assembly 20 is picked up and within a second preset time when the drive motor 24 stops working. For example, when a user picks up the electric toothbrush 10 for a first preset time, such as 1s, 3s, etc., the electric toothbrush 10 first enters the wake-up state and then enters the working state. Then, after turning off the electric toothbrush 10, that is, after exiting the working state, if the user does not put down the electric toothbrush 10 within a second preset time, such as 5s or other preset time, then it enters the wake-up state.

[0073] In one embodiment, the awakening state may also be that the user triggers the electric toothbrush 10 to enter the awakening state through an instruction, such as a voice instruction, a button instruction, a signal instruction, etc.

[0074] Specifically, the handle assembly 20 also has a standby state. In the standby state, the drive motor 24 is not powered on, so that there is no electromagnetic force to keep the drive shaft 241 fixed relative to the handle assembly 20, so that the drive shaft 241 can rotate relative to the handle assembly, such as the drive shaft 241 can rotate 360 ​​degrees; the handle assembly 20 also includes a control module 27 and a sensing module 28, the control module 27 is electrically connected to the drive motor 24, and the sensing module 28 is electrically connected to the control module 27. When the sensing module 28 is triggered, the handle assembly 20 switches from the standby state to the wake-up state, and the control module 27 controls the drive motor 24 to generate electromagnetic force to fix the drive shaft 241 relative to the handle assembly 20.

[0075] It can be understood that the coil of the drive motor 24 can generate a magnetic field after being energized. The greater the current, the stronger the magnetic field, so that the coil will be magnetically attracted to the permanent magnet. The drive motor 24 has an electromagnetic force that keeps the drive shaft 241 fixed relative to the handle assembly 20.

[0076] In one embodiment, the sensing module 28 is configured as a motion sensor or a gyroscope or an acceleration sensor for detecting the motion state of the handle assembly 20. Taking the gyroscope as an example, when the user picks up the electric toothbrush 10, the gyroscope senses the rotational motion of the handle assembly 20 around its three axes (X, Y, and Z axes), and the handle assembly 20 automatically switches to the manual mode through the control module 27.

[0077] In one embodiment, the sensing module 28 is configured as a piezoelectric sensor, a temperature sensor, a contact sensor, or a photoelectric sensor for detecting when the handle assembly 20 is held. Taking the temperature sensor as an example, when the user holds the handle assembly 20, the handle assembly 20 automatically switches to the manual mode through the control module 27.

[0078] In one embodiment, the electric toothbrush 10 further includes a base adapted to the handle assembly 20, and the sensing module 28 is configured as a Hall sensor or an RF sensor or a conductive contact for detecting when the base and the handle assembly 20 are separated, and the base can also charge the electric toothbrush 10. For example, when the user picks up the electric toothbrush 10, the Hall sensor is disconnected, and the control module 27 controls the drive motor 24 to generate current, and the stator module 242 and the rotor module 243 are magnetically matched to keep the relative positions fixed, and the electric toothbrush 10 enters the awakening state, and the user can brush his teeth manually, or can further start the electric toothbrush 10, for example, switch to the working state through the display screen 23 or a button, and select different working modes, such as cleaning mode, whitening mode, etc. Similarly, it is also possible to switch back to the awakening state through the mode switch in the working state. For example, in the cleaning mode, the user feels that the brushing is finished, and the remaining cleaning part only wants to be brushed manually for a few times, and can choose to switch to the manual mode to manually complete the oral cleaning process.

[0079] After the electric toothbrush 10 detects that the conditions are met through the sensing module 28, the specific action of executing the instruction through the control module 27 is a relatively mature technology in the prior art and will not be repeated here.

[0080] In the present application, the handle assembly 20 has an awake state, in which a constant current is supplied to the drive motor 24, and the drive motor 24 generates electromagnetic force through the coil, and the drive shaft 241 of the drive motor 24 remains fixed relative to the handle assembly 20 under the adsorption of the electromagnetic force, so that when the user wants to use the electric toothbrush 10 to manually brush the oral cavity, the brush head of the electric toothbrush 10 will not rotate, and the electric toothbrush 10 can continue to be used as an ordinary toothbrush, so as to meet the use needs of different users and improve the user experience.

[0081] It should be noted that the drive motor 24 may or may not work in the awakened state; the awakened state means that the drive shaft 241 of the drive motor 24 is magnetically engaged with the stator module 242 and the rotor module 243 to maintain a fixed relative position.

[0082] The electric toothbrush 10 can be in standby mode and enter the awake state through the induction module 28; in the awake state, the user can hold the handle to manually brush the mouth, and the brush head will not rotate; in the awake state, the user can select different working modes according to their own usage needs and enter the working state.

[0083] Specifically, the handle assembly 20 has a plurality of working gears, and different working gears correspond to different functional modes, and the functional modes include a switchable working mode and a manual mode. When switched to the manual mode, the control module 27 controls the drive motor 24 to generate electromagnetic force, so that the drive shaft 241 is fixed relative to the handle assembly 20. The working modes include but are not limited to:

[0084] Daily cleaning mode is suitable for daily use and basic oral cleaning needs. This mode uses the vibrating brush head to effectively remove plaque and food debris to keep the mouth clean. For most people, the daily cleaning mode is sufficient to meet the needs of oral cleaning.

[0085] Deep cleaning mode, which usually uses a higher vibration frequency and denser bristles, can clean deeply between teeth and gum lines and effectively remove tartar. Deep cleaning mode is suitable for those who want to clean their mouth more carefully and thoroughly.

[0086] Gum Care Mode, which uses soft bristles and gentle vibrations to stimulate and massage the gums, promote blood circulation, and reduce the risk of gum bleeding and periodontal disease. Gum Care Mode is suitable for those with sensitive or easily bleeding gums.

[0087] When in working state, the driving motor 24 does not have the electromagnetic force to keep the driving shaft 241 fixed relative to the handle assembly 20. When in working state, for example, if the user selects the daily cleaning mode and then wants to brush his teeth manually, he can also switch to the manual mode to fix the driving shaft 241 relative to the handle assembly 20.

[0088] The functional mode also includes a flight mode, and the handle assembly has a flight mode. In the flight mode, the handle assembly:

[0089] The handle assembly 20 does not switch from the standby state to the awakening state when the awakening condition is met; or

[0090] When the handle assembly 20 is in the awake state, the drive motor 24 has no electromagnetic force.

[0091] In the flight mode, the drive motor 24 does not work.

[0092] Specifically, in flight mode, the electric toothbrush 10 will not wake up when the wake-up conditions are met. In flight mode, the drive shaft 241 of the drive motor 24 can rotate relative to the toothbrush handle; and when carrying the electric toothbrush 10, if vibration, movement, button pressing triggering and other operations that will wake up the toothbrush occur, the control mode will not control the drive motor 24 to perform corresponding actions, thereby avoiding wasting power of the electric toothbrush 10 when not in use and extending the standby time and usage time.

[0093] In standby mode, the drive shaft 241 can rotate 360 ​​degrees. When working, the direction of rotation of the motor is changed by applying opposite electrical signals. The motor is provided with a sensor for detecting the rotation angle of the shaft, thereby realizing closed-loop control of the rotation angle and electronic limiting.

[0094] Specifically, when the drive motor 24 is not powered on, the drive shaft 241 can rotate 360 ​​degrees. When in working state, the control module 27 applies an opposite electrical signal through the position sensor 26 to adjust the swing angle 60 of the drive shaft 241. The drive motor 24 has a sensor for detecting the rotation angle of the drive shaft 241, thereby realizing closed-loop control of the rotation angle and electronic limit. In this solution, the rotational movement of the drive shaft 241 is divided into swinging and rotating. During the swinging process of the drive shaft 241, the teeth can be cleaned; and the rotation is mainly for adjusting the reference position 50 of the drive shaft 241, that is, the drive motor 24 realizes the rotation of the drive shaft 241 by making the drive shaft 241 swing while the drive shaft 241 rotates. When the user's holding posture remains unchanged, the brush head can be deflected, and the swing angle 60 of the drive motor 24 has a larger adjustment range, so that it can cover a wider tooth surface and improve the cleaning effect.

[0095] In addition, the driving motor 24 adopts electronic limit. In order to solve the different swing angles 60 of the brush head in different modes and realize accurate closed-loop control, the handle assembly 20 also includes a position sensor 26 for detecting the rotation angle of the driving shaft 241. When the electric toothbrush 10 is in working state, the control module 27 controls the rotation of the driving shaft 241 according to the rotation angle detected by the position sensor 26. The rotation angle of the motor shaft is detected by the position sensor 26, so as to realize the control of the rotation angle of the driving shaft 241 under different working gears. For example, the brush head and the front of the handle are the swing 0 axis. Under different working gears, the swing angle 60 of the driving shaft 241, that is, the cleaning range of the brush head, can be a swing angle 60 of 30°, 40°, 42°, 50°, etc. centered on the swing 0 axis.

[0096] In order to achieve precise closed-loop control, when switching from the awake state to the working state, the drive shaft 241 is reset from the preset position 30 to the swing 0 axis or reference position 50 during operation, thereby enabling the drive motor 24 to have a more precise initial reference position, which is conducive to precise closed-loop control of the motor angle.

[0097] It should be noted that the preset position 30 mentioned above is configured as the reference position 50 when the drive shaft 241 swings; the reference position 50, that is, the swing 0 axis when the drive shaft 241 swings, the reference position 50 can be changed as needed, for example, the swing 0 axis is centered on the button of the handle, and is rotated left / right by a certain angle relative to the front of the handle as a new reference position 50. The reference position 50 can also be the holding position 40 of the drive shaft 241.

[0098] It can be understood that in order to meet the manual use requirements of the electric toothbrush 10, the electromagnetic force ranges from 3N to 10N. The electromagnetic force needs to be greater than the product of the pressure of brushing and the friction coefficient u between the toothbrush head, u is less than 1, and the pressure is usually around 1.5~3N. That is, when the user manually uses the electric toothbrush 10, the electromagnetic force that keeps the brush head fixed relative to the handle assembly 20 is at least greater than 3N. Considering that different users give different pressures to brush their teeth, and that excessive electromagnetic force requires consideration of better electromagnetic coil materials, larger currents, etc., which will affect the use effect of the electric toothbrush 10, a reasonable selection and control is made within the range of 3N-10N. In addition, during the initial setting process, the electromagnetic force can be 4N, 5N, or 6N, which ensures that the user's manual brushing process has good stability and improves the user's experience.

[0099] Furthermore, the control module 27 controls the drive motor 24 to generate electromagnetic force at a preset position 30 in a preset manner, so that the drive shaft 241 remains fixed relative to the handle assembly 20 at the preset position 30. The preset position 30 may be a position before awakening. For example, in the standby state, the direction in which the brush head faces is the initial position, and the preset position 30 is configured as the initial position; for example, the preset position 30 is configured as a reference position 50 when the drive shaft 241 swings. The reference position 50 may be the swing 0 axis of the drive shaft 241. Figure 3 and Figure 4 For example, the preset position 30 is configured to be obtained by rotating the reference position 50 when the drive shaft 241 is swung in a preset manner, that is, the preset position 30 that can be customized by the user, such as a position twisted 45° relative to the holding position / the front of the handle, so that the brush head can form a 45° angle with the tooth surface, which complies with the Bass brushing method; for example, the button of the brush head facing the handle is the swing 0 axis (reference position 50), if the user presets the position 30 to be 45° to the left / right of the front of the handle; when entering the wake-up state or switching to the manual mode, the control module 27 will control the coils at different positions of the drive motor 24 to generate electromagnetic force, so that the brush head will rotate to the preset position 30, that is, the position 45° relative to the front of the handle, and then remain at the preset position 30, which can also be 15°, 20°, 30°, etc.

[0100] It should be noted that the reference position 50 and the preset position 30 may be the same position or different positions. Figure 3 For example, if the reference position 50 is Figure 3 The middle dotted line indicates the position, then the preset position 30 can be the position indicated by the dotted line on the left, the position indicated by the middle dotted line, or the position indicated by the dotted line on the right; if the initial position of the brush head is different from the preset position 30 when entering the awakening state, the drive shaft 241 will rotate to the preset position 30 under the effect of magnetism. From the user's point of view, after starting the drive shaft 241, the brush head automatically rotates to the preset position 30 set; and when the preset position 30 is different from the swing position, such as Figure 4 The position indicated by the middle dotted line is the preset position 30. In order to accurately adjust the swing angle 60 during the swinging process, when the working state is changed from the awakening state, the driving shaft 241 will first rotate from the preset position 30 to the reference position 50, and then vibrate.

[0101] As mentioned above, the larger the current, the stronger the magnetic field. In order to meet the usage needs of different users, the size of the electromagnetic force can be adjusted. For example, if the user is accustomed to brushing gently, the electromagnetic force can be matched to be smaller, or the user hopes that the brush head has a slight shaking feeling during brushing to meet the user's different brushing habits.

[0102] In one embodiment, the handle assembly 20 further includes an adjustment module, which is electrically connected to the control module 27 and is used to adjust the magnitude of the electromagnetic force.

[0103] In one embodiment, the handle assembly 20 further includes a wireless communication module 29, which is electrically connected to the control module 27. After receiving a signal instruction from the wireless communication module 29, the control module 27 adjusts the magnitude of the electromagnetic force to meet the use requirements of different users. For example, if the user is used to brushing gently, the electromagnetic force can be smaller, or if the user is used to keeping the brush head still without shaking, the electromagnetic force can be increased to better fix the brush head, thereby meeting the different brushing habits of users.

[0104] In one embodiment, the regulating module is configured as a wireless communication module 29, and the wireless communication module 29 is electrically connected to the control module 27. After receiving a signal instruction through the wireless communication module 29, the control module 27 controls the regulating module to adjust the magnitude of the electromagnetic force.

[0105] Specifically, the wireless communication module 29 is configured as at least one of a Bluetooth module, a WIFI module, a ZigBee module, a TPUNB module, a LoRa module, and a GPRS module.

[0106] The toothbrush can be connected to a terminal to provide a better teeth cleaning experience and interconnection functions with smart phones or other devices. For example, the user can adjust the size of the electromagnetic force of the drive motor 24 through a mobile phone app to meet different brushing habits. By setting the size of the electromagnetic force, it can better match the brushing habits while saving power.

[0107] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electric toothbrush, characterized in that: include: Brush head assembly; and A handle assembly, the handle assembly includes a handle barrel and a drive motor located in the handle barrel, the drive motor includes a stator module, a rotor module and a drive shaft, the rotor module is rotatably connected to the stator module, the drive shaft is fixed to the rotor module, the stator module and the rotor module are magnetically matched with each other, a portion of the drive shaft extends from the handle barrel, and the brush head assembly is connected to the drive shaft; The handle assembly has a plurality of working gears, and the rotation angle range of the drive shaft is different in different working gears; or, the rotation angle of the drive shaft is adjustable; Wherein, the handle assembly has an awake state, and in the awake state, the drive motor has an electromagnetic force to keep the drive shaft fixed relative to the handle assembly.

2. The electric toothbrush according to claim 1, characterized in that The handle assembly also has a standby state, in which the drive shaft can rotate relative to the handle assembly; The handle assembly also includes a control module and a sensing module. The control module is electrically connected to the drive motor, and the sensing module is electrically connected to the control module. When the sensing module is triggered, the handle assembly switches from the standby state to the wake-up state. The control module controls the drive motor to generate electromagnetic force to fix the drive shaft relative to the handle assembly.

3. The electric toothbrush according to claim 2, characterized in that The control module controls the drive motor in a preset manner to generate electromagnetic force at a preset position, so that the drive shaft remains fixed relative to the handle assembly at the preset position.

4. The electric toothbrush according to claim 3, characterized in that The preset position is configured as an initial position of the drive shaft when in a standby state; Alternatively, the preset position is configured as a reference position when the drive shaft is oscillating; Alternatively, the preset position is configured to be obtained by rotating a reference position when the drive shaft is controlled to swing in a preset manner.

5. The electric toothbrush according to claim 2, characterized in that: The fixed position of the driving shaft relative to the handle assembly is a holding position. When in the awakening state and the driving shaft deviates from the holding position, the driving shaft can be reset to the holding position under the action of the electromagnetic force.

6. The electric toothbrush according to claim 2, characterized in that The handle assembly also includes an adjustment module, which is electrically connected to the control module and is used to adjust the magnitude of the electromagnetic force.

7. The electric toothbrush according to claim 6, characterized in that The regulating module is configured as a wireless communication module, and the wireless communication module is electrically connected to the control module. After receiving a signal instruction through the wireless communication module, the control module adjusts the magnitude of the electromagnetic force.

8. The electric toothbrush according to claim 1, characterized in that The electromagnetic force ranges from 3N to 10N.

9. The electric toothbrush according to claim 2, characterized in that: The handle assembly also has a working state, and the handle assembly also includes a position sensor for detecting the rotation angle of the drive shaft. When the electric toothbrush is in the working state, the control module controls the rotation of the drive shaft according to the rotation angle detected by the position sensor.

10. The electric toothbrush according to claim 1, characterized in that: The stator module drives the rotor module to drive the drive shaft to swing back and forth within a first angle range, and drives the drive shaft to rotate back and forth within a second angle range. The first angle range is smaller than the second angle range, and the swing frequency of the drive shaft is greater than the rotation frequency of the drive shaft.

11. The electric toothbrush according to claim 1, characterized in that The handle assembly is in a wake-up state within a first preset time after the handle assembly is picked up and / or within a second preset time after the drive motor stops working.

12. The electric toothbrush according to claim 11, characterized in that The handle assembly has a flight mode, and in the flight mode: The handle assembly does not switch from the standby state to the awakening state when the awakening condition is met; or When the handle assembly is in the awakening state, the drive motor has no electromagnetic force.

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