An electric toothbrush
By using a dual-degree-of-freedom motor and a combination of low- and high-frequency vibration signals, the problem of insufficient freedom of movement in existing electric toothbrushes has been solved, resulting in better teeth cleaning and conforming to the scientific method of Bass brushing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI QINGHE XIAOBEI TECH CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing electric toothbrush motors only have the freedom to swing up and down, which limits the diversity of complex vibration motions and cannot effectively achieve left-right swinging and forward-backward movement, thus failing to meet the cleaning requirements of the horizontal vibrating brushing method recommended by the Chinese Stomatological Association.
Employing a dual-degree-of-freedom motor, the control chip and motor drive chip work together to enable the motor output shaft to move simultaneously in the x and y directions, forming a circular or elliptical displacement trajectory. Combined with the superposition of low-frequency and high-frequency vibration signals, the brushing effect is enhanced.
It achieves a specific movement trajectory of the brush head, enhances the coverage of teeth cleaning, improves brushing effect, and better conforms to the scientific cleaning method of Bass brushing.
Smart Images
Figure CN224484199U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of oral or dental hygiene devices, and specifically relates to an electric toothbrush. Background Technology
[0002] Most electric toothbrushes on the market today have motors that only have one degree of freedom: vertical oscillation. When an electric toothbrush is working, the main controller can achieve composite vibration by arranging, combining, and superimposing various frequencies of the motor drive signal. However, due to the limitations of the motor's degree of freedom, the resulting composite motion is limited to changes in the amplitude of the vertical oscillation.
[0003] The Chinese Stomatological Association recommends the horizontal scrubbing brushing method for teeth cleaning. The entire brushing process using this method involves the movement of the brush head in two directions: left and right swinging and back and forth movement. This cleans the inner and outer surfaces of certain teeth and adjacent teeth, effectively cleaning grooves and crevices in different directions, thus increasing the cleaning effect. Utility Model Content
[0004] This utility model is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by this utility model is to provide an electric toothbrush to improve brushing performance.
[0005] To solve the above problems, the technical solution provided by this utility model includes:
[0006] An electric toothbrush is provided, comprising: a brush head with bristles for cleaning teeth; and a brush handle connected to the brush head, the brush handle having a cavity inside, wherein a control chip, a motor drive chip, and a two-degree-of-freedom motor are disposed within the cavity. The control chip is electrically connected to a first magnetic circuit and a second magnetic circuit in the two-degree-of-freedom motor via the motor drive chip. Under the action of a first signal, the first magnetic circuit causes the motor output shaft to perform linear reciprocating motion along its extension direction, the first signal including a first sine wave with a first frequency. Under the action of a second signal, the second magnetic circuit causes the motor output shaft to perform reciprocating rotational motion along its axial direction, the second signal including a second sine wave with a first frequency and a periodic signal with a second frequency. The first frequency ranges from 1 to 10 Hz, the second frequency is more than twenty times the first frequency, and the phase difference between the first sine wave and the second sine wave is [missing information]. The two-degree-of-freedom motor will generate a second frequency vibration displacement under the control of the first and second signals, while forming a circular or elliptical displacement trajectory.
[0007] Preferably, the dual-degree-of-freedom motor is provided with a motor output shaft; the brush head is provided with a receiving space; the motor output shaft extends into the receiving space, and when the motor output shaft moves along a circular or elliptical displacement trajectory, the brush head moves accordingly.
[0008] Preferably, the second frequency range is 150~400Hz.
[0009] Preferably, the motor drive chip includes a first motor drive chip and a second motor drive chip; the first motor drive chip outputs a first power signal to a first magnetic circuit electrically connected to it through a first power signal output module, so that the motor output shaft moves along the y-direction according to... The motor output shaft is displaced in a certain way, with the y-direction being the left-right direction of its extension and retraction. The second motor drive chip outputs a second power signal to the second magnetic circuit electrically connected to it through a second power signal output module, so that the motor output shaft moves along the x-direction in a certain manner. The displacement is achieved in the manner described above, with the x-direction representing the vertical component of the rotation of the motor output shaft; where A... xL Let A be the amplitude of the motor output shaft displacement in the x-direction under the first frequency vibration. xH Let A be the amplitude of the motor output shaft displacement in the x-direction under the second frequency vibration. y f is the displacement amplitude of the motor output shaft corresponding to the first frequency vibration in the y direction. L f is the motor vibration frequency corresponding to the first frequency. H This is the motor vibration frequency corresponding to the second frequency.
[0010] Preferably, the motor drive chip includes a first motor drive chip and a second motor drive chip; the first motor drive chip outputs a first power signal to a first magnetic circuit electrically connected to it through a first power signal output module, so that the motor output shaft moves along the y-direction according to... The motor output shaft is displaced in a certain way, with the y-direction being the left-right direction of its extension and retraction. The second motor drive chip outputs a second power signal to the second magnetic circuit electrically connected to it through a second power signal output module, so that the motor output shaft moves along the x-direction in a certain manner. The displacement is achieved in the manner described above, with the x-direction representing the vertical component of the rotation of the motor output shaft; where A... xL Let A be the amplitude of the motor output shaft displacement in the x-direction under the first frequency vibration. xH Let A be the amplitude of the motor output shaft displacement in the x-direction under the second frequency vibration. y f is the displacement amplitude of the motor output shaft corresponding to the first frequency vibration in the y direction. L f is the motor vibration frequency corresponding to the first frequency. H This is the motor vibration frequency corresponding to the second frequency.
[0011] Preferably, the control chip is electrically connected to the first motor drive chip and the second motor drive chip respectively; the first drive signal emitted by the control chip is transmitted to the first motor drive chip to form a first power signal; the second drive signal emitted by the control chip is transmitted to the second motor drive chip to form a second power signal.
[0012] Preferably, the first power signal output by the first power signal output module is positively correlated with the displacement of the motor output shaft in the y direction; and the second power signal output by the second power signal output module is positively correlated with the displacement of the motor output shaft in the x direction.
[0013] Preferably, the control chip includes a first drive signal output module, which outputs a first drive signal and is electrically connected to a first motor drive chip, wherein the first motor drive signal is positively correlated with a first power signal.
[0014] Preferably, the control chip further includes a second drive signal output module, which outputs a second drive signal and is electrically connected to the second motor drive chip, wherein the second motor drive signal is positively correlated with the second power signal.
[0015] Preferably, the sign of the phase difference between the first sine signal and the second sine signal determines the rotation direction of the displacement trajectory formed by the motor output shaft.
[0016] Compared with existing technologies, the electric toothbrush head provided by this invention can form a specific motion trajectory during operation. This trajectory provides a wider brushing coverage, resulting in better cleaning and a superior user experience. Furthermore, the elliptical displacement trajectory formed by the brush head motor better conforms to the Bass brushing technique, enabling more effective and scientific teeth cleaning. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this specification 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 recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.
[0018] Figure 1 This is a schematic diagram of the module connection of the electric toothbrush in an embodiment of the present utility model;
[0019] Figure 2 This is a schematic diagram of the displacement obtained by superimposing low-frequency vibration of the motor in the x-direction with high-frequency sinusoidal vibration in an embodiment of this utility model.
[0020] Figure 3In this embodiment of the invention, the motor is in the y-direction with... Figure 2 low-frequency vibration phase difference in the x-direction A schematic diagram of the displacement of low-frequency vibration;
[0021] Figure 4 This is a schematic diagram of the displacement obtained by superimposing low-frequency vibration of the motor in the x-direction with high-frequency square wave vibration in an embodiment of this utility model.
[0022] Figure 5 In this embodiment of the invention, the motor is in the y-direction with... Figure 4 low-frequency vibration phase difference in the x-direction A schematic diagram of the displacement of low-frequency vibration. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0025] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.
[0026] To facilitate understanding of the embodiments of this utility model, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.
[0027] This embodiment provides an electric toothbrush, such as Figure 1 As shown.
[0028] The electric toothbrush includes a brush head and a handle.
[0029] A brush head, which is provided with bristles for cleaning teeth. The brush head also has a receiving space inside.
[0030] A brush handle, connected to the brush head, is used for gripping. The brush handle has an internal space to accommodate a circuit board and a dual-degree-of-freedom motor, the circuit board being electrically connected to the dual-degree-of-freedom motor. The motor's output shaft is adapted to the accommodating space within the brush head, allowing the motor output shaft to extend into the accommodating space. When the motor drives the output shaft to move along a specific trajectory, the brush head moves accordingly.
[0031] The circuit board includes a control chip and a motor drive chip. The control chip is electrically connected to the motor drive chip, and controls the motor drive chip through generated drive signals. Specifically, the control chip includes a first drive signal output module and a second drive signal output module. The motor drive chip includes a first motor drive chip and a second motor drive chip. The first drive signal output module is electrically connected to the first motor drive chip, and the second drive signal output module is electrically connected to the second motor drive chip. The first motor drive chip includes a first power signal output module, and the second motor drive chip includes a second power signal output module. The two-degree-of-freedom motor includes a first magnetic circuit and a second magnetic circuit. The first power signal output module is electrically connected to the first magnetic circuit, and the second power signal output module is electrically connected to the second magnetic circuit. That is, the first drive signal output module in the control chip outputs a first drive signal to the first motor drive chip, and the first power signal output module of the first motor drive chip outputs a first power signal to the first magnetic circuit, thereby driving the dual-degree-of-freedom motor to perform linear reciprocating motion under the action of the first magnetic circuit, which is referred to as left-right motion, corresponding to the movement in the y-direction; correspondingly, the second power signal output module of the second motor drive chip outputs a second power signal to the second magnetic circuit, thereby driving the dual-degree-of-freedom motor to perform rotational motion under the action of the second magnetic circuit, which is referred to as up-down motion, corresponding to the movement in the x-direction.
[0032] The oscillator and motor shaft of a two-degree-of-freedom motor will simultaneously perform corresponding movements in two directions. When the power signals of the two magnetic circuits conform to a specific pattern, the toothbrush head inserted into the motor shaft will generate a specific motion trajectory under the drive of the motor.
[0033] Since the displacement of the motor is positively correlated with the power signal of the corresponding motor driver chip, and the power signal is positively correlated with the drive signal of the corresponding control chip, the drive signal output by the control chip is related to the displacement characteristics of the motor. If the motor needs to generate a certain motion trajectory, it is only necessary to output a drive signal corresponding to the specific motion trajectory by the control chip.
[0034] In order to achieve toothbrush oscillation adapted to the Bass brushing method, this embodiment sets the specific movement trajectory of the brush head to be elliptical or circular.
[0035] The projections of uniform circular motion on any plane onto two mutually orthogonal linear directions are both simple harmonic motions. Conversely, when two orthogonal simple harmonic motions of the same frequency have a phase difference of a specific value, they can be combined to form uniform circular motion.
[0036] Specifically, when the displacement of the motor in the x direction is And its displacement in the y direction is At that time, the sum and displacement of the motor are .in, and Let be the displacement amplitudes in the x and y directions, respectively, and f be the frequency. At that time, there is Therefore, the motor's displacement is uniform circular motion, and the trajectory produced by the motor is circular. When At that time, the motion trajectory generated by the motor is elliptical.
[0037] Similarly, when the displacement of the motor in the x direction is And its displacement in the y direction is At that time, the sum and displacement of the motor are still expressed as Similarly, when At that time, the motion trajectory generated by the motor is circular. At that time, the motion trajectory generated by the motor is elliptical.
[0038] Therefore, it can be concluded that when the displacements of the motor in the x and y directions are sinusoidal functions of the same frequency, and the phase difference between them is... When the displacement amplitudes in the x and y directions are equal, the displacement will produce an elliptical trajectory. Furthermore, when the displacement amplitudes in the x and y directions are equal, the displacement will be a circular trajectory. The direction of the motor's circular motion is related to the sign of the phase difference.
[0039] To achieve better brushing results and more closely mimic the Bass brushing technique, the brush head needs to produce a clearly defined circular or elliptical brushing trajectory. When the brush head's movement trajectory is distinctly circular or elliptical, it indicates that its vibration amplitude has reached a relatively ideal state. To achieve this circular or elliptical trajectory, the corresponding motion frequency is usually relatively low. This is because as the frequency increases, the vibration amplitude decreases, making the resulting circular or elliptical effect less pronounced, thus reducing the brushing effectiveness. Therefore, the motion frequency is typically set between 1 and 10 Hz.
[0040] However, operating solely at the aforementioned motion frequency would be insufficient for effective brushing due to its low frequency. Therefore, a high-frequency vibration is superimposed on top, with a frequency range of 150-400Hz, positioned in the x-direction to clean the teeth. Because the superimposed high-frequency vibration differs significantly from the original low-frequency circular or elliptical motion frequency, it is easily superimposed, allowing the toothbrush to maintain a circular motion even during high-frequency vibration. This superimposed high-frequency vibration is a periodic signal.
[0041] Specifically, the superimposed high-frequency vibrations can be sinusoidal waves, such as... Figure 2 As shown, the displacement of the motor in the x-direction after superimposed high-frequency vibration is: The displacement of the motor in the y-direction is: When the displacement in the y direction is At that time, its schematic diagram is as follows Figure 3 As shown. Where A xL Let A be the displacement amplitude of the low-frequency vibration in the x-direction. xH Let Ay be the displacement amplitude of the high-frequency vibration in the x-direction, and let f be the displacement amplitude of the low-frequency vibration in the y-direction. L f is the frequency of low-frequency vibration. H It represents the frequency of high-frequency vibration.
[0042] Superimposed high-frequency vibrations can be square waves, such as... Figure 4 As shown, the displacement of the motor in the x-direction after superimposed high-frequency vibration is: The displacement of the motor in the y-direction is: When the displacement in the y direction is At that time, its schematic diagram is as follows Figure 5 As shown. Where A xL Let A be the displacement amplitude of the low-frequency vibration in the x-direction. xH Let A be the displacement amplitude of the high-frequency vibration in the x-direction. y f represents the displacement amplitude of the low-frequency vibration in the y-direction. L f is the frequency of low-frequency vibration. H It represents the frequency of high-frequency vibration.
[0043] A xL A xH A y Adjustments need to be made based on the characteristics of the motor and the required amplitude during actual use. L Typically, values between 1 and 10 Hz are used. H Typically, a value between 150 and 400 Hz is used. The phase difference between y and x... The symbol determines the direction of the circle-drawing action.
[0044] To generate the displacement trajectory of the aforementioned motor, the drive signals sent by the control chip can be configured. Specifically, the control chip will issue two drive signals, namely a first drive signal and a second drive signal, corresponding to two motor drive chips, namely a first motor drive chip and a second motor drive chip, which respectively issue a first power signal and a second power signal. The first magnetic circuit performs linear reciprocating motion under the influence of the first signal, which includes a first sine wave with a first frequency; the second magnetic circuit rotates under the influence of the second signal, which includes a second sine wave with a first frequency and a sine wave with a second frequency, wherein the first frequency corresponding to the first sine wave and the second sine wave are low frequencies, and the second frequency corresponds to a high frequency, and the phase difference between the first sine wave and the second sine wave is... At that time, the corresponding motor will generate high-frequency vibration and simultaneously form a circular motion, resulting in a distinct ellipse.
[0045] Furthermore, when the second driving signal is a superposition of a low-frequency sine wave signal and a high-frequency square wave signal, that is, the frequency of the square wave signal is the second frequency, and the phase difference between the first sine wave signal and the second sine wave signal is... Similarly, the motor will generate high-frequency vibrations while simultaneously creating a circular motion, resulting in a distinct elliptical circle.
[0046] The method provided in this embodiment for making the brush head generate a specific motion trajectory during operation can achieve a larger brushing coverage area and produce a better cleaning effect.
[0047] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. An electric toothbrush, characterized in that, include: A brush head, which is equipped with bristles, for cleaning teeth; The brush handle is connected to the brush head. The brush handle has a cavity inside, in which a control chip, a motor drive chip, and a dual-degree-of-freedom motor are disposed. The control chip is electrically connected to the first and second magnetic circuits of the dual-degree-of-freedom motor through the motor drive chip. Under the action of the first signal, the motor output shaft performs linear reciprocating motion along its extension direction. The first signal includes a first sinusoidal signal with a first frequency. Under the action of the second signal, the output shaft of the motor reciprocates along its axial direction. The second signal includes a second sinusoidal signal with a first frequency and a periodic waveform with a second frequency. The first frequency range is 1–10 Hz, the second frequency is more than twenty times the first frequency, and the phase difference between the first and second sinusoidal signals is [missing information]. A two-degree-of-freedom motor will generate a second frequency vibration displacement under the control of the first and second signals, while simultaneously forming a circular or elliptical displacement trajectory.
2. The electric toothbrush according to claim 1, characterized in that, The dual-degree-of-freedom motor is equipped with a motor output shaft; the brush head is equipped with a receiving space; the motor output shaft extends into the receiving space, and when the motor output shaft moves along a circular or elliptical displacement trajectory, the brush head moves accordingly.
3. The electric toothbrush according to claim 1, characterized in that, The second frequency range is 150 to 400 Hz.
4. The electric toothbrush according to claim 1, characterized in that, The motor drive chip includes a first motor drive chip and a second motor drive chip. The first motor driver chip outputs a first power signal to the first magnetic circuit electrically connected to it through a first power signal output module, so that the motor output shaft moves along the y-direction according to... The displacement is achieved in the manner described above, with the y-direction being the left and right direction of the motor output shaft's extension and retraction. The second motor driving chip outputs a second power signal to the second magnetic circuit electrically connected thereto through a second power signal output module, so that the motor output shaft is displaced in the x direction according to x=A xL sin2πft L t+A xH sin2πft H t manner, and the x direction is the component in the up-down direction when the motor output shaft rotates. Among them, A xL Let A be the amplitude of the motor output shaft displacement in the x-direction under the first frequency vibration. xH Let A be the amplitude of the motor output shaft displacement in the x-direction under the second frequency vibration. y f is the displacement amplitude of the motor output shaft corresponding to the first frequency vibration in the y direction. L f is the motor vibration frequency corresponding to the first frequency. H This is the motor vibration frequency corresponding to the second frequency.
5. The electric toothbrush according to claim 1, characterized in that, The motor drive chip includes a first motor drive chip and a second motor drive chip. The first motor driver chip outputs a first power signal to the first magnetic circuit electrically connected to it through a first power signal output module, so that the motor output shaft moves along the y-direction according to... The displacement is achieved in the manner described above, with the y-direction being the left and right direction of the motor output shaft's extension and retraction. The second motor drive chip outputs a second power signal to the second magnetic circuit electrically connected to it through the second power signal output module, so that the motor output shaft moves along the x-direction according to... The displacement is performed in the manner of n = 0, 1, 2, 3..., and the x-direction is the vertical component of the rotation of the motor output shaft. Among them, A xL Let A be the amplitude of the motor output shaft displacement in the x-direction under the first frequency vibration. xH Let A be the amplitude of the motor output shaft displacement in the x-direction under the second frequency vibration. y f is the displacement amplitude of the motor output shaft corresponding to the first frequency vibration in the y direction. L f is the motor vibration frequency corresponding to the first frequency. H This is the motor vibration frequency corresponding to the second frequency.
6. The electric toothbrush according to claim 4 or 5, characterized in that, The control chip is electrically connected to the first motor drive chip and the second motor drive chip, respectively. The first drive signal emitted by the control chip is transmitted to the first motor drive chip to form a first power signal; The second drive signal emitted by the control chip is transmitted to the second motor drive chip to form a second power signal.
7. The electric toothbrush according to claim 4 or 5, characterized in that, The first power signal output by the first power signal output module is positively correlated with the displacement of the motor output shaft in the y direction; The second power signal output by the second power signal output module is positively correlated with the displacement of the motor output shaft in the x direction.
8. The electric toothbrush according to claim 7, characterized in that, The control chip includes, The first drive signal output module outputs a first drive signal and is electrically connected to the first motor drive chip. The first motor drive signal is positively correlated with the first power signal.
9. The electric toothbrush according to claim 7, characterized in that, The control chip also includes, The second drive signal output module outputs a second drive signal and is electrically connected to the second motor drive chip. The second motor drive signal is positively correlated with the second power signal.
10. The electric toothbrush according to claim 1, characterized in that, The sign of the phase difference between the first and second sine signals determines the rotation direction of the displacement trajectory formed by the motor output shaft.