Electric toothbrush

Abstract

Disclosed is an electric toothbrush, comprising a handle assembly and a brush head assembly. The brush head assembly and the handle assembly are detachably connected. A motor shaft of a driving motor can drive the brush head assembly to swing, and the swing angle of the brush head assembly on one side is not less than 5 degrees. The brush head assembly comprises a brush rod, a brush plate, bristles, and a shock absorber. The brush plate has a front surface, a rear surface, and a peripheral surface arranged between the front surface and the rear surface, wherein the front surface and the rear surface are opposite in the thickness direction. The shock absorber covers at least part of the rear surface and / or at least part of the peripheral surface. The hardness of the shock absorber is less than the hardness of the brush plate.

Description

electric toothbrush

[0001] Related applications

[0002] This application claims priority from the following Chinese patent application:

[0003] Priority to Chinese patent application number 2024201238919 filed on January 17, 2024, entitled “Electric Toothbrush”;

[0004] The above patents are hereby incorporated by reference in their entirety into this application. Technical Field

[0005] The present application relates to the technical field of oral cleaning appliances, and in particular to an electric toothbrush. Background Art

[0006] Currently, sonic electric toothbrushes clean teeth through high-frequency reciprocating motion. However, due to the narrow swing angle, the cleaning range is limited, making it easy to miss spots when brushing. Therefore, toothbrushes are designed to swing at a larger angle to create a horizontal brushing effect, eliminating the problem of missed spots or requiring manual horizontal brushing. However, in related technologies, large swing angles can easily cause the brush head to rub against teeth, causing damage to teeth or extreme discomfort to the user. Summary of the Invention

[0007] The main purpose of this application is to propose an electric toothbrush, which aims to solve the problem that the brush head of the electric toothbrush easily hits the teeth when it swings at a large angle, thereby causing damage to the teeth or causing discomfort to the user.

[0008] To achieve the above-mentioned object, the present application proposes an electric toothbrush, which includes a handle assembly and a brush head assembly, the handle assembly having a housing, wherein a drive motor is disposed within the housing; the brush head assembly is detachably connected to a drive shaft of the drive motor, and the drive shaft can drive the brush head assembly to reciprocate along the circumference of the drive shaft with a preset swing center line as the center and having a first extreme position and a second extreme position, wherein the angle between the first extreme position and the preset swing center line is not less than 5°, and / or the angle between the second extreme position and the preset swing center line is not less than 5°;

[0009] In which, the brush head assembly includes a brush rod, a brush plate, bristles and a shock-absorbing member, the brush plate is arranged at one end of the brush rod, the brush plate has a front side and a back side relative to each other in the thickness direction, the brush plate also has a peripheral side surface arranged between the front side and the back side, and the bristles are arranged on the front side; the shock-absorbing member covers at least part of the back side and / or at least part of the peripheral side surface; the hardness of the shock-absorbing member is less than the hardness of the brush plate.

[0010] In one embodiment, the shock-absorbing member is further covered on at least a portion of the outer wall surface of the brush rod.

[0011] In one embodiment, in the length direction of the brush rod, the length of the portion of the shock absorbing member covering the outer wall surface of the brush rod is not less than 5 mm.

[0012] In one embodiment, in the length direction of the brush rod, the length of the shock absorbing member is not less than 25 mm.

[0013] In one embodiment, the thickness of the shock absorbing element ranges from 0.3 mm to 3 mm.

[0014] In one embodiment, the distance from the portion of the shock-absorbing component covering the peripheral side surface to the front surface is no more than 2 mm.

[0015] In one embodiment, the shock-absorbing component covers at least a portion of the front surface.

[0016] In one embodiment, the width of the brush head assembly is no greater than 15 mm, and / or the thickness of the brush head assembly is no greater than 18 mm.

[0017] In one embodiment, in the thickness direction of the brush head assembly, the middle portion of the back surface is thicker than the edge portion of the back surface, and the edge portion has a smooth transition to the connection with the middle portion and the peripheral side surface.

[0018] In one embodiment, the back surface includes a transition surface located in the middle portion of the back surface and extending along the length direction of the brush plate, and a concave arc surface arranged on the outer side of the transition surface.

[0019] In one embodiment, the electric toothbrush has a swing mode, in which the preset swing center line of the brush head assembly swings back and forth along the circumference of the drive shaft, wherein a first preset angle is formed between the first extreme position and the preset swing center line, and a second preset angle is formed between the second extreme position and the preset swing center line, and the angle range of the first preset angle and the second preset angle is 5°-60°.

[0020] In one embodiment, the drive motor drives the drive shaft to swing back and forth between the first extreme position and the second extreme position, and drives the drive shaft to vibrate at a vibration angle of 1° to 5°, and the swing frequency of the drive shaft is lower than the vibration frequency of the drive shaft.

[0021] In one embodiment, the vibration frequency range of the drive shaft is 10000 Hz / min-40000 Hz / min; and / or the oscillation frequency of the drive shaft is 200 Hz / min-1000 Hz / min.

[0022] In one embodiment, when the drive motor is started, the drive shaft swings for a time T, and the range of T is 0.05s-2s. Within the range of T, the drive shaft swings and its swing angle is less than a preset angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] FIG1 is a schematic structural diagram of an embodiment of an electric toothbrush of the present application;

[0025] FIG2 is a schematic structural diagram of a brush head assembly of the electric toothbrush in FIG1 ;

[0026] FIG3 is an exploded view of the brush head assembly in FIG2 ;

[0027] FIG4 is a schematic structural diagram of the drive motor of the present application;

[0028] FIG5 is a cross-sectional view of the drive motor in FIG4 ;

[0029] FIG6 is a schematic diagram of a preset swing centerline and swing angle of a drive shaft in one embodiment of the present application;

[0030] FIG. 7 is a schematic diagram of the vibration angle of the drive shaft in one embodiment of the present application.

[0031] Description of Figure Numbers:

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] This application proposes an embodiment of an electric toothbrush. Currently, sonic electric toothbrushes achieve the goal of cleaning teeth through high-frequency reciprocating oscillation. However, due to the small oscillation angle, the cleaning range is insufficient, and it is easy to miss brushed teeth during brushing. Therefore, the toothbrush's oscillation angle is set to a larger angle to produce a horizontal brushing effect, solving the problem of missed brushes or requiring manual horizontal brushing. However, in related art, large-angle oscillation can easily cause the brush head to hit the teeth, causing damage to the teeth or causing extreme discomfort to the user.

[0034] Please refer to Figures 1 to 5. In one embodiment of the present application, the electric toothbrush 10 includes a handle assembly 100 and a brush head assembly 200. The handle assembly 100 has a housing 110, and a drive motor 111 is provided in the housing 110; the brush head assembly 200 is detachably connected to the drive shaft 111a of the drive motor 111, and the drive shaft 111a can drive the brush head assembly 200 to swing back and forth along the circumference of the drive shaft 111a with a preset swing center line 300 as the center and has a first limit position 410 and a second limit position 420, and the angle between the first limit position 410 and the preset swing center line 300 is not less than 5°, and / or the second limit position 420 is not less than 5°. The angle between the extreme position 420 and the preset swing center line 300 is not less than 5°; wherein, the brush head assembly 200 includes a brush rod 210, a brush plate 220, bristles 230 and a shock-absorbing member 240, and the brush plate 220 is arranged at one end of the brush rod 210, and the brush plate 220 has a front face 221 and a back face 222 opposite to each other in the thickness direction. The brush plate 220 also has a peripheral side face 223 arranged between the front face 221 and the back face 222, and the bristles 230 are arranged on the front face 221; the shock-absorbing member 240 covers at least part of the back face 222, and / or at least part of the peripheral side face 223; the hardness of the shock-absorbing member 240 is less than the hardness of the brush plate 220.

[0035] Specifically, the handle assembly 100 includes a shell 110, in which a drive motor 111, a battery, a circuit board and a sealing device (not shown in the figure) are arranged. The shell 110 of the handle assembly 100 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 part of the entire toothbrush. The electric toothbrush 10 usually uses rechargeable batteries, such as nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, lithium polymers, and lead-acid batteries. These batteries have a long service life and can be charged by a charger. The drive motor 111 drives the drive motor 111 of the toothbrush to vibrate or swing through the energy provided by the power supply, thereby driving the brush head assembly 200 to vibrate or swing to achieve a cleaning effect.

[0036] Please refer to Figures 4 and 5. The handle assembly 100 includes a housing 110 and a drive motor 111 located within the housing 110. The drive motor 111 includes a stator module 111b, a rotor module 111c, and a drive shaft 111a. The stator module 111b can be arranged on the circumference of the rotor module 111c, and the rotor module 111c is rotatably connected to the stator module 111b. The stator module 111b and the rotor module 111c cooperate with each other magnetically to drive the rotor module 111c to rotate. The stator module 111b may include a permanent magnet or an electromagnet. The rotor module 111c includes a rotor shaft 111a (i.e., the drive shaft 111a). The rotor shaft 111a is usually connected to the brush head. When the rotor shaft 111a rotates back and forth, it can drive the brush head to rotate back and forth, thereby cleaning the oral cavity. The rotor module 111c may include a permanent magnet or an electromagnet. A portion of the driving shaft 111 a extends from the housing 110 , and the brush head assembly 200 is detachably connected to the driving shaft 111 a .

[0037] There is usually at least one button (not shown in the figure) on the shell 110, which is connected to the circuit board for controlling the switch and mode selection of the electric toothbrush 10. The circuit board is usually located inside the handle of the electric toothbrush 10. The circuit board integrates a control module, a wireless communication module, a power management module, etc. The circuit board contains multiple electronic components, such as integrated circuits, resistors, capacitors, transistors, etc., to achieve specific functions.

[0038] Referring to FIG. 6 , the drive shaft 111 a can drive the brush head assembly 200 to oscillate reciprocally along the circumference of the drive shaft 111 a about a preset oscillation centerline 300. The oscillation is primarily a reciprocating motion for cleaning teeth. The preset oscillation centerline 300 is a virtual line that can be understood as a virtual line passing through the axis of the brush head assembly 200 (i.e., having an intersection with the axis of the brush head assembly 200) and perpendicular to the axis of the brush head assembly 200. It should be noted that the preset oscillation centerline 300 is configured as a reference line when the drive shaft 111 a oscillates, i.e., the oscillation centerline of the drive shaft 111 a oscillates. The preset oscillation centerline 300 can be changed as needed. For example, the preset oscillation centerline 300 can be centered on the button of the housing 110 of the handle assembly 100 and rotated left / right by a certain angle relative to the front face 221 of the handle to serve as a new preset oscillation centerline 300.

[0039] Referring to FIG6 , when the brush head assembly 200 swings, it has a first extreme position 410 and a second extreme position 420 relative to the preset swing centerline 300, wherein the angle between the first extreme position 410 and the preset swing centerline 300 is not less than 5°, or the angle between the second extreme position 420 and the preset swing centerline 300 is not less than 5°, or the angle between the first extreme position 410 and the preset swing centerline 300 and the angle between the second extreme position 420 and the preset swing centerline 300 are both not less than 5°. In this way, the brush head assembly 200 can cover more areas to be cleaned when swinging, that is, while ensuring the cleaning efficiency of the electric toothbrush 10, the electric toothbrush 10 can also have a larger cleaning range.

[0040] 2 and 3 , the brush head assembly 200 includes a brush rod 210, a brush plate 220, bristles 230, and a shock-absorbing member 240. The brush plate 220 has a front face 221 and a back face 222 that are opposite to each other in the thickness direction. The brush plate 220 also has a peripheral side face 223 disposed between the front face 221 and the back face 222, and the bristles 230 are disposed on the front face 221. Generally speaking, the front face 221 of the brush plate 220 and the front face 221 of the handle assembly 100 (i.e., the side face on which the button is disposed) are disposed on the same side, and the brush head assembly 200 is centered on the front face 221. This not only meets the expectations of most users regarding the position of the brush head assembly 200, but also facilitates user use, preventing users from using the wrong angle and posture when brushing their teeth due to the deflection of the brush head assembly 200, thereby ensuring effective brushing. The front side 221 of the brush plate 220 is provided with a hair-planting hole (not marked in the figure), and the bristles 230 are arranged in the hair-planting hole. The bristles 230 are the part of the electric toothbrush 10 that contacts the teeth and are usually made of soft nylon brushes to effectively clean the tooth surface and gum line.

[0041] The shock-absorbing member 240 is coated on at least a portion of the back surface 222, or coated on at least a portion of the peripheral side surface 223, or coated on at least a portion of the back surface 222 and the peripheral side surface 223 at the same time, and the hardness of the shock-absorbing member 240 is less than the hardness of the brush plate 220. The shock-absorbing member 240 is injection molded to prevent the user from directly contacting the harder brush plate 220 with the skin in the user's oral cavity when using the electric toothbrush 10, thereby improving the user's experience of use. The shock-absorbing member 240 is transparent, and the shock-absorbing member 240 and the brush plate 220 are injection molded. It can be molded on the brush plate 220 by secondary injection molding or two-color injection molding, and then the brush plate 220 is subjected to a hair planting process. Alternatively, when the melting point of the bristles 230 is greater than the melting point of the shock-absorbing member 240, the brush plate 220 can be subjected to a hair planting process first, and then the shock-absorbing member 240 is injection molded on the brush plate 220.

[0042] The material of the shock-absorbing member 240 is silicone, rubber or PVC. By covering at least part of the back surface 222 and / or at least part of the peripheral side surface 223 with the soft shock-absorbing member 240, it is ensured that when the user uses the electric toothbrush 10, when the brush head assembly 200 swings at a large angle, the hard brush plate 220 will not directly hit the teeth, thereby causing damage to the teeth or causing discomfort to the user.

[0043] The technical solution of the present application drives the brush head assembly 200 to swing back and forth along the circumferential direction of the drive shaft 111a with a preset swing center line 300 as the center through the drive shaft 111a of the drive motor 111, and the angle of its unilateral swing is not less than 5°, so as to ensure that the electric toothbrush 10 has a larger cleaning range. At the same time, a shock-absorbing member 240 is coated on at least part of the back side 222 and / or at least part of the circumferential side surface 223 of the brush plate 220. The hardness of the shock-absorbing member 240 is less than that of the brush plate 220, so as to avoid the hard brush plate 220 hitting the teeth when the brush head assembly 200 swings at a large angle, thereby causing damage to the teeth or causing discomfort to the user.

[0044] Referring to FIG3 , in one embodiment, the shock-absorbing member 240 further covers at least a portion of the outer wall surface of the brush rod 210. Specifically, the soft shock-absorbing member 240 covers at least a portion of the outer wall surface of the brush rod 210, which can increase the contact area between the shock-absorbing member 240 and the brush plate 220 and the brush rod 210, and improve the bonding force between the shock-absorbing member 240 and the brush plate 220 and the brush rod 210. At the same time, when the shock-absorbing member 240 covers at least a portion of the outer wall surface of the brush rod 210, it can also prevent the hard brush rod 210 from directly hitting the user's teeth during use of the electric toothbrush 10, causing damage to the teeth or causing discomfort to the user.

[0045] It is taken into consideration that when the electric toothbrush 10 is in use, at least part of the brush rod 210 is also extended into the oral cavity. When the user brushes their teeth, the brush rod 210 will also rotate back and forth, and there is a possibility that the brush rod 210 will hit the teeth. In view of this, in order to solve this problem, the length of the outer wall portion of the brush rod 210 covered by the shock-absorbing member 240 in the length direction of the brush rod 210 is not less than 5mm, so that when the brush rod 210 rotates back and forth, the hard brush rod 210 will not directly hit the teeth, thereby avoiding damage to the teeth or causing discomfort to the user. The length of the outer wall portion of the brush rod 210 covered by the shock-absorbing member 240 can be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, for example.

[0046] In one embodiment, the length of the shock absorbing member 240 along the length of the brush rod 210 is not less than 25 mm. It is understood that when the electric toothbrush 10 is in use, the length of the portion of the brush head assembly 200 that extends into the oral cavity is greater than 20 mm. By setting the length of the shock absorbing member 240 along the length of the brush rod 210 to be not less than 25 mm, the collision between the hard portion of the brush head assembly 200 and the teeth can be minimized, thereby preventing damage to the user's teeth.

[0047] In one embodiment, the thickness of the shock absorbing member 240 ranges from 0.3 mm to 3 mm. Specifically, the thickness of the shock absorbing member 240 ranges from 0.3 mm to 3 mm. Exemplarily, its thickness can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm. Taking into account the errors in the production of the brush head assembly 200, the thickness of the shock absorbing member 240 can be roughly equal to the above range. It should be noted that, since the shock-absorbing member 240 wraps at least the back side 222 of the brush plate 220, and / or wraps at least part of the peripheral side surface 223, and since the shape of the brush plate 220 can be designed in various ways, in order to adapt to the shape of the brush plate 220, the thickness of the shock-absorbing member 240 wrapped around the brush plate 220 can be consistent, or it can be designed to be thicker in some areas and thinner in some areas. As long as the overall thickness of the shock-absorbing member 240 is in the range of 0.3mm to 3mm, it is within the protection scope of this application.

[0048] In one embodiment, the distance from the portion of the shock-absorbing member 240 covering the circumferential side surface 223 to the front surface 221 is no greater than 2 mm. In other words, the shock-absorbing member 240 covers the circumferential side surface 223 of the brush plate 220 as completely as possible to prevent the user's teeth from being hit by the hard circumferential side surface 223 of the brush plate 220 while the user is using the electric toothbrush 10, causing discomfort or damage to the user's teeth. It should be noted that the distance from the portion of the shock-absorbing member 240 covering the circumferential side surface 223 to the front surface 221 is no greater than 2 mm, which means that the shortest distance from any point on the portion of the shock-absorbing member 240 covering the circumferential side surface 223 to the front surface 221 is no greater than 2 mm.

[0049] In one embodiment, the shock-absorbing member 240 covers at least a portion of the front face 221. Specifically, the shock-absorbing member 240 covers at least a portion of the back face 222 and / or at least a portion of the peripheral side face 223, and further covers at least a portion of the front face 221, so as to further prevent the harder brush plate 220 from hitting the user's teeth during use. Optionally, the shock-absorbing member 240 covers at least a portion of the front face 221 on the basis of completely covering the back face 222 and the peripheral side face 223, and the covered at least portion of the front face 221 extends from the peripheral side face 223 to the front face 221 (i.e., it also covers the connection between the peripheral side face 223 and the front face 221), so that when the user uses the electric toothbrush 10, the back face 222, the peripheral side face 223, and the connection between the peripheral side face 223 and the front face 221 of the brush plate 220 are not easy to cause damage to the user's teeth or cause discomfort to the user when hitting the user's teeth.

[0050] In one embodiment, the width of the brush head assembly 200 is no greater than 15 mm, and / or the thickness of the brush head assembly 200 is no greater than 18 mm. Specifically, the width of the brush head assembly 200 is no greater than 15 mm, or the thickness of the brush head assembly 200 is no greater than 18 mm, or the width of the brush head assembly 200 is no greater than 15 mm and the thickness of the brush head assembly 200 is no greater than 18 mm. When the width of the brush head assembly 200 is greater than 15 mm, the wider brush head assembly 200 is likely to hit the user's teeth during use, causing discomfort to the user. Similarly, when the thickness of the brush head assembly 200 is greater than 18 mm, on the one hand, it is likely to hit the user's teeth during use, and on the other hand, due to the angle at which the user's mouth is opened, the thicker brush head assembly 200 is difficult to insert into the user's oral cavity.

[0051] 2 and 3 , in one embodiment, in the thickness direction of the brush head assembly 200, the middle portion of the back surface 222 is thicker than the edge portion of the back surface 222, and the edge portion smoothly transitions to the connection between the middle portion and the peripheral side surface 223. Specifically, in the thickness direction of the brush head assembly 200, the middle portion of the back surface 222 of the brush plate 220 is thicker and the edge portion is thinner, that is, the height of the middle portion of the back surface 222 of the brush plate 220 is higher than the edge portion of the back surface 222 of the brush plate 220, and the connection between the edge portion, the middle portion and the peripheral side surface 223 smoothly transitions to the connection between the edge portion and the middle portion. With this arrangement, when the electric toothbrush 10 is in use, the smooth connection surface (not shown in the figure) formed between the middle portion and the edge portion of the back surface 222 during the swinging of the brush head assembly 200 creates a clearance space for the teeth. This smooth connection surface prevents the brush head assembly 200 from touching the teeth during the swinging process, thereby preventing damage to the user's teeth and providing a good user experience.

[0052] Furthermore, the back surface 222 includes a transition surface 222a located in the middle portion of the back surface 222 and extending along the length of the brush plate 220, and a concave arc surface 222b disposed outside the transition surface 222a. Specifically, the concave arc surface 222b is a curved surface similar to the motion trajectory of the brush head assembly 200 when it swings, so as to better avoid teeth and prevent them from colliding and causing damage.

[0053] Please refer to Figure 6. In one embodiment, the electric toothbrush 10 has a swing mode. In the swing mode, the preset swing center line 300 of the brush head assembly 200 swings back and forth along the circumference of the drive shaft 111a, wherein a first preset angle 510 is formed between the first extreme position 410 and the preset swing center line 300, and a second preset angle 520 is formed between the second extreme position 420 and the preset swing center line 300. The angle range of the first preset angle 510 and the second preset angle 520 is 5°-60°.

[0054] Specifically, the preset swing center is as described above and will not be described in detail here. During the swinging process of the brush head assembly 200, the first preset angle 510 and the second preset angle 520 have an angle range of 5°-60°.

[0055] In this way, it can be ensured that the brush head assembly 200 has a certain cleaning range, and the trajectory of the end of the bristles 230 when swinging can be roughly on the same plane. The angle of the first preset angle 510 can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°. Similarly, the angle of the second preset angle 520 can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°. If the angle range of the first preset angle 510 and / or the second preset angle 520 is less than 5°, the cleaning range of the brush head assembly 200 is too small, affecting the cleaning efficiency. If the first preset angle 510 and / or the second preset angle 520 are greater than 60°, the swing amplitude of the brush head assembly 200 is large, and the movement trajectory of the ends of the bristles 230 is not in a plane. In other words, the contact time between the bristles 230 and the tooth surface during swinging is limited, affecting the cleaning effect. In addition, excessive swing amplitude of the brush head assembly 200 may also affect the vibration frequency.

[0056] It should be noted that the angular range of the first preset angle 510 and the second preset angle 520 is the angular range when the drive shaft 111a is not connected to the brush head assembly 200. If the drive shaft 111a is connected to the brush head assembly 200 (i.e., the drive shaft 111a is installed with a load), the angular range of the first preset angle 510 and the second preset angle 520 actually measured will have slight deviations from the above-mentioned angular range, and both are within the protection scope of the first preset angle 510 and the second preset angle 520 of this application. At the same time, due to the limitations of the angle measurement tools and measurement methods, the first preset angle 510 and the second preset angle 520 may have slight errors from the above-mentioned exemplary angles when actually measured, and can be rounded to the above-mentioned exemplary angles.

[0057] Referring to Figures 5 and 6, the drive motor 111 drives the drive shaft 111a to swing back and forth between a first extreme position 410 and a second extreme position 420, and drives the drive shaft 111a to vibrate at an oscillation angle 600 of 1° to 5°. The oscillation frequency of the drive shaft 111a is lower than the vibration frequency of the drive shaft 111a. Specifically, the brush head assembly 200 is connected to the drive shaft 111a. While the drive shaft 111a drives the brush head assembly 200 to swing, it also drives the brush head assembly 200 to vibrate. The vibration axis changes to form a sweeping motion, achieving a sweeping and vibrating motion. The vibration separates plaque from the tooth surface, and the sweeping motion scrapes the plaque off the tooth surface, further enhancing the cleaning power of the brush head assembly 200 on the teeth, achieving a better cleaning effect. At the same time, the brush head assembly 200 can effectively prevent tooth rubbing. The oscillation angle 600 is exemplarily 1°, 1.5°, 2°, 2.5°, 3°, 3.5°, 4°, 4.5°, and 5°. It should be noted that the above-mentioned range of the vibration angle 600 is the angular range when the drive shaft 111a is not connected to the brush head assembly 200. If the drive shaft 111a is connected to the brush head assembly 200 (i.e., the drive shaft 111a is installed with a load), the actual measured angular range of the vibration angle 600 of the drive shaft 111a will have slight deviations from the above-mentioned angular range, which are all within the protection range of the vibration angle 600 of this application. At the same time, due to the limitations of the angle measurement tools and measurement methods, the actual measurement of the vibration angle 600 of the drive shaft 111a may have slight errors from the above-mentioned exemplary angles, and can be rounded to an integer to be recognized as the above-mentioned exemplary angle.

[0058] Furthermore, the driving motor 111 drives the vibration center position of the driving shaft 111 a to change, so that the driving shaft 111 a swings back and forth between the first limit position 410 and the second limit position 420 . It should be noted that the vibration center of the drive shaft 111a is the center of the drive shaft 111a when it vibrates at a certain moment. The drive shaft 111a vibrates about the vibration center. When the drive motor 111 drives the vibration center position of the drive shaft 111a to change, the position of the drive shaft 111a will change. The position change trajectory of the vibration center forms the position change trajectory of the drive shaft, and the position change trajectory of the vibration center is located between the first extreme position 410 and the second extreme position 420; taking the perspective shown in Figure 6 as an example, for example, when the vibration center rotates 60° to the left relative to the preset swing center line 300, the drive shaft 111a is at the first extreme position 410, and at this time the drive shaft 111a can vibrate at a vibration angle 600 of 2° about the vibration center; when the vibration center rotates 60° to the right relative to the preset swing center line 300, the drive shaft 111a is at the second extreme position 420, and at this time the drive shaft 111a can also vibrate at a vibration angle 600 of 2° about the vibration center.

[0059] Furthermore, the vibration frequency range of the drive shaft 111a is 10000Hz / min-40000Hz / min; and / or, the swing frequency of the drive shaft 111a is 200Hz / min-1000Hz / min. The vibration frequency of the drive shaft 111a is exemplarily 11000Hz / min, 12000Hz / min, 13000Hz / min, 14000Hz / min, 15000Hz / min, 16000Hz / min, 17000Hz / min, 18000Hz / min, 19000Hz / min, 20000Hz / min, 21000Hz / min, 22000Hz / min, 23000Hz / min, 24000Hz / min, 25 000Hz / min, 26000Hz / min, 27000Hz / min, 28000Hz / min, 29000Hz / min, 30000Hz / min, 31000Hz / min, 32000Hz / min, 3 3000Hz / min, 34000Hz / min, 35000Hz / min, 36000Hz / min, 37000Hz / min, 38000Hz / min, 39000Hz / min, 40000Hz / min. The oscillation frequency of the drive shaft 111a is exemplarily 250Hz / min, 300Hz / min, 350Hz / min, 400Hz / min, 450Hz / min, 500Hz / min, 550Hz / min, 600Hz / min, 650Hz / min, 700Hz / min, 750Hz / min, 800Hz / min, 850Hz / min, 900Hz / min, 950Hz / min, and 10000Hz / min. The vibration frequency of the drive shaft 111a is higher than the oscillation frequency, and the vibration plays a dominant role. The high-frequency vibration can better clean the teeth and remove foreign matter or dirt on the teeth through the sweeping motion.

[0060] In one embodiment, when the drive motor 111 is started, the drive shaft 111a swings for a time T, and the range of T is 0.05s-2s. Within the range of T, the drive shaft 111a swings and its swing angle is less than a preset angle. Specifically, the electric toothbrush 10 can be configured so that when the drive motor 111 is started, the drive shaft 111a swings within a preset time T, and T is exemplarily 0.05s, 0.1s, 0.2s, 0.3s, 0.4s, 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, 1.0s, 1.1s, 1.2s, 1.3s, 1.4s, 1.5s, 1.6s, 1.7s, 1.8s, 1.9s, or 2.0s. During the time T, the swing angle of the drive shaft 111a is less than a preset angle. The preset angle can be set by the user or preset at the factory. The preset angle is configured to be less than 5°. Exemplary preset angles include 4.5°, 4°, 3.5°, 3°, 2.5°, 2°, 1.5°, 1°, and 0.5°. After the motor is started, the drive shaft 111a swings within the preset time T, which can serve to remind the user that the brush head assembly 200 has started working. It can also serve to remind the user that the position of the brush head assembly 200 has swung to the initial position, reminding the user that the brush head assembly 200 has been successfully aligned.

[0061] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An electric toothbrush, wherein, The electric toothbrush includes: a handle assembly having a housing in which a drive motor is provided; and a brush head assembly detachably connected to the drive shaft of the drive motor, the drive shaft being capable of driving the brush head assembly to reciprocally swing circumferentially around a preset swing center line and having a first limit position and a second limit position, the angle between the first limit position and the preset swing center line being not less than 5°, and / or the angle between the second limit position and the preset swing center line being not less than 5°; wherein, the brush head assembly includes a brush rod, a brush plate, bristles and a shock-absorbing member, the brush plate is disposed at one end of the brush rod, the brush plate has a front surface and a back surface opposite to each other in the thickness direction, the brush plate further has a circumferential side surface disposed between the front surface and the back surface, and the bristles are disposed on the front surface; the shock-absorbing member covers at least part of the back surface, and / or at least part of the circumferential side surface; the hardness of the shock-absorbing member is less than the hardness of the brush plate.

2. The electric toothbrush according to claim 1, wherein, The shock-absorbing member also covers at least part of the outer wall surface of the brush rod.

3. The electric toothbrush according to claim 2, wherein, In the length direction of the brush rod, the length of the part of the outer wall surface of the brush rod covered by the shock-absorbing member is not less than 5 mm.

4. The electric toothbrush according to claim 1, wherein, In the length direction of the brush rod, the length of the shock-absorbing member is not less than 25 mm.

5. The electric toothbrush according to claim 1, wherein, The thickness range of the shock-absorbing member is 0.3 mm to 3 mm.

6. The electric toothbrush according to claim 1, wherein, The distance from the part of the shock-absorbing member covering the circumferential side surface to the front surface is not greater than 2 mm.

7. The electric toothbrush according to claim 1, wherein, The shock-absorbing member covers at least part of the front surface.

8. The electric toothbrush according to claim 1, wherein, The width of the brush head assembly is not greater than 15 mm, and / or the thickness of the brush head assembly is not greater than 18 mm.

9. The electric toothbrush according to claim 1, wherein, In the thickness direction of the brush head assembly, the middle part of the back surface is thicker than the edge part of the back surface, and the connection between the edge part and the middle part and the circumferential side surface is smoothly transitioned.

10. The electric toothbrush according to claim 9, wherein, The shock-absorbing member also covers at least part of the outer wall surface of the brush rod.

11. The electric toothbrush according to claim 10, wherein, In the length direction of the brush rod, the length of the part of the outer wall surface of the brush rod covered by the shock-absorbing member is not less than 5 mm.

12. The electric toothbrush according to claim 9, wherein, In the length direction of the brush rod, the length of the shock-absorbing member is not less than 25 mm.

13. The electric toothbrush according to claim 9, wherein, The thickness range of the shock-absorbing member is 0.3 mm to 3 mm.

14. The electric toothbrush according to claim 9, wherein, The distance from the part of the shock-absorbing member covering the circumferential side surface to the front surface is not greater than 2 mm.

15. The electric toothbrush according to claim 9, wherein, The shock-absorbing member covers at least part of the front surface.

16. The electric toothbrush according to claim 9, wherein, The back surface includes a transition surface located in the middle part of the back surface and extending along the length direction of the brush plate, and a concave arc surface disposed outside the transition surface.

17. The electric toothbrush according to claim 1, wherein, The electric toothbrush has a swing mode, in which the preset swing center line of the brush head assembly reciprocally swings circumferentially along the drive shaft, wherein, a first preset angle is formed between the first limit position and the preset swing center line, a second preset angle is formed between the second limit position and the preset swing center line, and the angular range of the first preset angle and the second preset angle is 5° - 60°.

18. The electric toothbrush according to claim 17, wherein, The driving motor drives the driving shaft to swing back and forth between the first extreme position and the second extreme position, and drives the driving shaft to vibrate at a vibration angle of 1° to 5°. The swing frequency of the driving shaft is lower than the vibration frequency of the driving shaft.

19. The electric toothbrush according to claim 18, wherein, The driving motor drives the vibration center position of the driving shaft to change, so that the driving shaft swings back and forth between the first extreme position and the second extreme position.

20. The electric toothbrush according to claim 18, wherein, The vibration frequency range of the driving shaft is 10000 Hz / min - 40000 Hz / min; and / or, the swing frequency of the driving shaft is 200 Hz / min - 1000 Hz / min.

21. The electric toothbrush according to claim 1, wherein, When the driving motor starts, the driving shaft swings for a time T, and the range of T is 0.05 s - 2 s. Within the range of T, the driving shaft swings and its swing angle is less than a preset angle.

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