Electric toothbrush

Abstract

The utility model discloses an electric toothbrush which comprises a handle assembly and a brush head assembly, the brush head assembly is detachably connected with the handle assembly, a motor shaft of a driving motor can drive the brush head assembly to swing, the unilateral swing angle of the brush head assembly is not smaller than 5 degrees, and the brush head assembly comprises a brush rod, a brush plate, bristles and a cushioning piece. The front face and the back face are opposite in the thickness direction, the circumferential side face is arranged between the front face and the back face, and the cushioning piece wraps at least part of the back face and / or at least part of the circumferential side face. The hardness of the cushioning piece is smaller than that of the brush plate. The electric toothbrush disclosed by the utility model can solve the problem that teeth are damaged or a user feels uncomfortable due to the fact that the toothbrush head is easy to hit teeth when the electric toothbrush swings at a large angle.

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] At present, sonic electric toothbrushes achieve the purpose of cleaning teeth through high-frequency reciprocating swings, but due to the small swing angle, the cleaning range is insufficient, and it is easy to miss brushing when brushing teeth. Therefore, the swing angle of the toothbrush is set to be larger to produce a horizontal brushing effect, solving the problem of missing brushing or requiring manual horizontal brushing. However, in the related art, large-angle swinging is prone to the problem of the brush head hitting the teeth, causing damage to the teeth or causing extreme discomfort to the user. Utility Model Content

[0003] The main purpose of the utility model is to provide an electric toothbrush, aiming to solve the problem that the brush head of the electric toothbrush is easy to hit the teeth when the electric toothbrush swings at a large angle, thereby causing damage to the teeth or causing discomfort to the user.

[0004] To achieve the above-mentioned object, the utility model provides an electric toothbrush, the electric toothbrush comprising a handle assembly and a brush head assembly, the handle assembly having a shell, a drive motor being arranged in the shell; the brush head assembly is detachably connected to a drive shaft of the drive motor, the drive shaft can drive the brush head assembly to swing back and forth 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, the angle between the first extreme position and the preset swing center line being not less than 5°, and / or the angle between the second extreme position and the preset swing center line being not less than 5°;

[0005] Wherein, 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.

[0006] In one embodiment, the shock absorbing member also covers at least a portion of the outer wall surface of the brush rod.

[0007] In one embodiment, in the length direction of the brush rod, the length of the shock absorbing member covering the outer wall surface of the brush rod is not less than 5 mm.

[0008] In one embodiment, in the length direction of the brush rod, the length of the shock absorbing member is not less than 25 mm.

[0009] In one embodiment, the thickness of the shock absorbing element ranges from 0.3 mm to 3 mm.

[0010] 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.

[0011] In one embodiment, the shock absorbing element covers at least a portion of the front surface.

[0012] 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.

[0013] 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 connection between the edge portion, the middle portion and the peripheral side surface is smoothly transitioned.

[0014] In one embodiment, the back side includes a transition surface located in the middle portion of the back side and extending along the length direction of the brush plate, and a concave arc surface arranged on the outer side of the transition surface.

[0015] In one embodiment, the electric toothbrush has a swing mode. In the swing mode, 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°.

[0016] 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.

[0017] In one embodiment, the vibration frequency range of the drive shaft is 10000 Hz / min-40000 Hz / min; and / or the swing frequency of the drive shaft is 200 Hz / min-1000 Hz / min.

[0018] In one embodiment, when the driving motor is started, the driving shaft swings for a time T, and the range of T is 0.05s-2s. Within the range of T, the driving shaft swings and its swing angle is less than a preset angle.

[0019] The technical solution of the utility model is to drive the brush head assembly to swing back and forth along the circumferential direction of the driving shaft with a preset swing center line as the center through the driving shaft of the driving motor, and the angle of the single-sided swing is not less than 5°, so as to ensure that the electric toothbrush has a larger cleaning range. At the same time, at least part of the back side of the brush plate and / or at least part of the circumferential side surface are coated with a shock-absorbing member, and the hardness of the shock-absorbing member is less than the hardness of the brush plate, so as to prevent the hard brush plate from hitting the teeth when the brush head assembly swings at a large angle, thereby causing damage to the teeth or causing discomfort to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is a schematic structural diagram of an embodiment of an electric toothbrush of the utility model;

[0022] Figure 2 for Figure 1 A schematic structural diagram of a brush head assembly of an electric toothbrush;

[0023] Figure 3 for Figure 2 Exploded view of the brush head assembly;

[0024] Figure 4 This is a schematic diagram of the structure of the drive motor of the utility model;

[0025] Figure 5 for Figure 4 A cross-sectional view of the middle drive motor;

[0026] Figure 6 A schematic diagram of a preset swing center line and swing angle of a drive shaft in one embodiment of the utility model;

[0027] Figure 7 It is a schematic diagram of the vibration angle of the drive shaft in one embodiment of the utility model.

[0028] Description of Figure Numbers:

[0029] Label name Label name 10 Electric toothbrush 222a Transition surface 100 Handle assembly 222b concave arc surface 110 case 223 Side 111 Drive motor 230 Bristles

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The utility model proposes an embodiment of an electric toothbrush. At present, sonic electric toothbrushes achieve the purpose of cleaning teeth through high-frequency reciprocating swings. However, due to the small swing angle, the cleaning range is insufficient, and the problem of missing teeth when brushing is likely to occur. Therefore, the swing angle of the toothbrush is set to be larger to produce a horizontal brushing effect, solving the problem of missing teeth or requiring manual horizontal brushing. However, in the related art, large-angle swings are likely to cause the brush head to hit the teeth, causing damage to the teeth or causing extreme discomfort to the user.

[0035] See also Figures 1 to 5In one embodiment of the utility model, 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 driving motor 111 is disposed in the housing 110; the brush head assembly 200 is detachably connected to a driving shaft 111a of the driving motor 111, and the driving shaft 111a can drive the brush head assembly 200 to swing back and forth along the circumference of the driving 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 The angle between the 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, the brush plate 220 is arranged at one end of the brush rod 210, the brush plate 220 has a front side 221 and a back side 222 opposite to each other in the thickness direction, the brush plate 220 also has a peripheral side surface 223 arranged between the front side 221 and the back side 222, and the bristles 230 are arranged on the front side 221; the shock-absorbing member 240 covers at least part of the back side 222, and / or at least part of the peripheral side surface 223; the hardness of the shock-absorbing member 240 is less than the hardness of the brush plate 220.

[0036] Specifically, the handle assembly 100 includes a housing 110, in which a drive motor 111, a battery, a circuit board, a sealing device, etc. (not shown in the figure) are arranged. The housing 110 of the handle assembly 100 usually has waterproof and sealing functions to protect the internal circuit and the 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.

[0037] See also Figure 4 and Figure 5, the handle assembly 100 includes a housing 110 and a drive motor 111 located in 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 peripheral side 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), which is usually connected to the brush head. When the rotor shaft 111a reciprocates, it can drive the brush head to reciprocate, 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 out from the housing 110 , and the brush head assembly 200 is detachably connected to the driving shaft 111 a .

[0038] 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.

[0039] See also Figure 6 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 the preset swing center line 300 as the center, and the swing is mainly a reciprocating motion for cleaning the teeth. Among them, the preset swing center line 300 is a virtual line, which can be understood as a virtual line passing through the axis of the brush head assembly 200 (that is, 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 swing center line 300 is configured as a reference line when the drive shaft 111a swings, that is, the swing center line when the drive shaft 111a swings. The preset swing center line 300 can be changed as needed. For example, the preset swing center line 300 is centered on the button of the housing 110 of the handle assembly 100, and is used as a new preset swing center line 300 by rotating a certain angle left / right relative to the front side 221 of the handle.

[0040] See also Figure 6When the brush head assembly 200 swings, it has a first limit position 410 and a second limit position 420 relative to the preset swing center line 300, wherein the angle between the first limit position 410 and the preset swing center line 300 is not less than 5°, or the angle between the second limit position 420 and the preset swing center line 300 is not less than 5°, or the angle between the first limit position 410 and the preset swing center line 300 and the angle between the second limit position 420 and the preset swing center line 300 are not less than 5°. In this way, it can be ensured that the brush head assembly 200 can cover more areas to be cleaned when swinging, that is, on the premise of ensuring the cleaning efficiency of the electric toothbrush 10, the electric toothbrush 10 can also have a larger cleaning range.

[0041] See also Figure 2 and Figure 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 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. 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 located in the center of the front face 221, so as to meet the expectations of most users for the position of the brush head assembly 200 and facilitate the use of the user, thereby avoiding the user from using the wrong angle and posture when brushing due to the angle deflection of the brush head assembly 200, so as to ensure the brushing effect. The front side 221 of the brush plate 220 is provided with a hair transplantation hole (not marked in the figure), and the bristles 230 are arranged in the hair transplantation 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 the gum line.

[0042] The shock-absorbing member 240 is coated on at least part of the back surface 222, or is coated on at least part of the peripheral side surface 223, or is coated on at least part 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 harder brush plate 220 from directly contacting the user's oral skin when the user uses the electric toothbrush 10, thereby improving the user's use experience. The shock-absorbing member 240 is set in a transparent state, 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, or, 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 first subjected to a hair planting process, and then the shock-absorbing member 240 is injection molded on the brush plate 220.

[0043] The material of the shock-absorbing member 240 is silicone, rubber or PVC. By covering at least a portion of the back side 222 and / or at least a portion of the peripheral side 223 with the soft shock-absorbing member 240, it is ensured that when the user uses the electric toothbrush 10 and 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.

[0044] The technical solution of the utility model drives the brush head assembly 200 to swing back and forth along the circumferential direction of the driving shaft 111a with a preset swing center line 300 as the center through the driving shaft 111a of the driving motor 111, and the angle of its single-sided swing is not less than 5°, so as to ensure that the electric toothbrush 10 has a larger cleaning range. At the same time, at least part of the back side 222 of the brush plate 220, and / or at least part of the circumferential side surface 223 are coated with a shock-absorbing member 240, and the hardness of the shock-absorbing member 240 is less than the hardness 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.

[0045] See also Figure 3 In one embodiment, the shock absorbing member 240 is also coated on at least a portion of the outer wall surface of the brush rod 210. Specifically, the soft shock absorbing member 240 is coated on 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 the use of the electric toothbrush 10, causing damage to the teeth or causing discomfort to the user.

[0046] It is considered that when the electric toothbrush 10 is in use, at least part of the brush rod 210 is also extended into the oral cavity, and the brush rod 210 will also reciprocate when the user brushes the teeth, and there is a possibility that the brush rod 210 hits the teeth. In view of this, in order to solve this problem, the length of the outer wall 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 reciprocates, the hard brush rod 210 will not directly hit the teeth, avoiding damage to the teeth or causing discomfort to the user. The length of the outer wall of the brush rod 210 covered by the shock-absorbing member 240 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, for example.

[0047] In one embodiment, the length of the shock absorbing member 240 is not less than 25 mm in the length direction of the brush rod 210. It is understandable that when the electric toothbrush 10 is used, the length of the portion of the brush head assembly 200 extending into the oral cavity is more than 20 mm. By setting the length of the shock absorbing member 240 in the length direction of the brush rod 210 to be not less than 25 mm, the collision between the hard part of the brush head assembly 200 and the teeth can be reduced as much as possible to avoid damage to the user's teeth.

[0048] 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. Considering that there are 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 the present utility model.

[0049] In one embodiment, the distance from the portion of the shock-absorbing member 240 covered on the circumferential side surface 223 to the front surface 221 is not 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 during the use of the electric toothbrush 10, causing discomfort to the user or damaging the teeth. It should be noted that the distance from the portion of the shock-absorbing member 240 covered on the circumferential side surface 223 to the front surface 221 is not greater than 2 mm, which means that the shortest distance from any point of the portion of the shock-absorbing member 240 covered on the circumferential side surface 223 to the front surface 221 is not greater than 2 mm.

[0050] 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 front face 221 on the basis of covering at least a portion of the back face 222 and / or at least a portion of the peripheral side face 223, so as to further prevent the harder brush plate 220 from hitting the user's teeth during use. Preferably, 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 a 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 they hit the user's teeth.

[0051] In one embodiment, the width of the brush head assembly 200 is not greater than 15 mm, and / or the thickness of the brush head assembly 200 is not greater than 18 mm. Specifically, the width of the brush head assembly 200 is not greater than 15 mm, or the thickness of the brush head assembly 200 is not greater than 18 mm, or the width of the brush head assembly 200 is not greater than 15 mm and the thickness of the brush head assembly 200 is not 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 easy 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 easy to hit the user's teeth during use, and on the other hand, it is limited by the angle of the user's mouth opening, and the thicker brush head assembly 200 is difficult to extend into the user's mouth.

[0052] See also Figure 2 and Figure 3 In one embodiment, in the thickness direction of the brush head assembly 200, the middle part of the back side 222 is thicker than the edge part of the back side 222, and the edge part has a smooth transition with the connection between the middle part and the peripheral side 223. Specifically, in the thickness direction of the brush head assembly 200, the middle part of the back side 222 of the brush plate 220 is thicker and the edge part is thinner, that is, the height of the middle part of the back side 222 of the brush plate 220 is higher than the edge part of the back side 222 of the brush plate 220, and the edge part has a smooth transition with the connection between the middle part and the peripheral side 223. With such a configuration, when the electric toothbrush 10 is in use, the smooth connection surface (not marked in the figure) formed from the middle part to the edge part of the back side 222 during the swinging process of the brush head assembly 200 will form an avoidance space for the teeth. The smooth connection surface can avoid touching the teeth during the swinging process of the brush head assembly 200, thereby avoiding damage to the user's teeth and providing the user with a good user experience.

[0053] Furthermore, the back surface 222 includes a transition surface 222a located in the middle part of the back surface 222 and extending along the length direction of the brush plate 220, and a concave arc surface 222b arranged 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 swinging, so as to better avoid the teeth and avoid collision with the teeth to cause damage to the teeth.

[0054] See also 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 driving 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, and the angle range of the first preset angle 510 and the second preset angle 520 is 5°-60°.

[0055] 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°.

[0056] Thereby, it can be ensured that the brush head assembly 200 has a certain cleaning range, and the trajectory of the end of the bristle 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 has an angle range 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 the same plane, that is, the contact time between the bristles 230 and the tooth surface during swinging is limited, which affects the cleaning effect. Moreover, a large swing amplitude of the brush head assembly 200 will also affect the vibration frequency.

[0057] It should be noted that the angle range of the first preset angle 510 and the second preset angle 520 is the angle 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 angle range actually measured by the first preset angle 510 and the second preset angle 520 has a slight deviation from the above angle range, which is within the protection range of the first preset angle 510 and the second preset angle 520 of the present application. At the same time, due to the limitations of the angle measurement tool and the measurement method, the first preset angle 510 and the second preset angle 520 have a slight error from the above exemplary angle when actually measured, and can be taken as an integer to be identified as the above exemplary angle.

[0058] See also Figure 5 and Figure 6 , further, the driving motor 111 drives the driving shaft 111a to swing back and forth between the first extreme position 410 and the second extreme position 420, and drives the driving shaft 111a to vibrate at a vibration angle 600 of 1° to 5°, and the swing frequency of the driving shaft 111a is lower than the vibration frequency of the driving shaft 111a. Specifically, the brush head assembly 200 is connected to the driving shaft 111a, and the driving shaft 111a drives the brush head assembly 200 to vibrate while driving the brush head assembly 200 to swing, and its vibration axis will change to form a sweeping motion, thereby achieving sweeping and vibration. Vibration separates the dental plaque from the tooth surface, and the dental plaque is scraped and peeled off the tooth surface by sweeping, so as to further improve the cleaning force of the brush head assembly 200 on the teeth, and the cleaning effect is better. At the same time, the brush head assembly 200 can effectively prevent tooth knocking. The vibration angle 600 is exemplarily 1°, 1.5°, 2°, 2.5°, 3°, 3.5°, 4°, 4.5°, 5°. It should be noted that the range of the above-mentioned vibration angle 600 is the angle 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 angle range of the vibration angle 600 of the drive shaft 111a has a slight deviation from the above-mentioned angle range, which is within the protection range of the vibration angle 600 of the present application. At the same time, due to the limitations of the angle measurement tools and measurement methods, the vibration angle 600 degrees of the drive shaft 111a has a slight error from the above-mentioned exemplary angle when actually measured, and an integer can be taken as the above-mentioned exemplary angle.

[0059] Further, 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, 25000Hz / min, 26000Hz / min, 27000Hz / min, 28000Hz / min, 29000Hz / min, 30000Hz / min, 31000Hz / min, 32000Hz / min, 33000Hz / min, 34000Hz / min, 35000Hz / min, 36000Hz / min, 37000Hz / min, 38000Hz / min, 39000Hz / min, 4000Hz / min, 41000Hz / min, 42000Hz / min, 43000Hz / min, 44000Hz / min, 45000Hz / min, 46000Hz / min, 47000Hz / min, 48000Hz / min, 49000Hz / min, 5000Hz / min, 51000Hz / min, 52000Hz / min, 53000Hz / 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 swing 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, 10000Hz / min. The vibration frequency of the drive shaft 111a is higher than the swing frequency, and the vibration is dominant. The teeth are better cleaned by high-frequency vibration, and foreign matter or dirt on the teeth is swept out by sweeping.

[0060] In one embodiment, when the driving motor 111 is started, the driving shaft 111a swings for a time T, and the range of T is 0.05s-2s. Within the range of T, the driving 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 driving motor 111 is started, the driving 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, 2.0s. Within the time T, the swing angle of the drive shaft 111a is less than the preset angle, which can be set by the user or preset at the factory, and the preset angle is configured to be less than 5°, and the preset angles are exemplarily 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 remind the user that the brush head assembly 200 has started working, and can also remind the user that the position of the brush head assembly 200 has been 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 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: The electric toothbrush comprises: A handle assembly having a housing, wherein a drive motor is disposed in the housing; and A brush head assembly is detachably connected to the driving shaft of the driving motor, and the driving shaft can drive the brush head assembly to swing back and forth along the circumference of the driving shaft with a preset swing center line as the center and has a first limit position and a second limit position, and the angle between the first limit position and the preset swing center line is not less than 5°, and / or the angle between the second limit position and the preset swing center line is 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 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.

2. The electric toothbrush according to claim 1, characterized in that The shock absorbing member also covers at least a portion of the outer wall surface of the brush rod.

3. The electric toothbrush according to claim 2, characterized in that In the length direction of the brush rod, the length of the shock absorbing component covering the outer wall surface of the brush rod is not less than 5 mm.

4. The electric toothbrush according to claim 1, characterized in that 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, characterized in that The thickness of the shock absorbing element ranges from 0.3 mm to 3 mm.

6. The electric toothbrush according to claim 1, characterized in that 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.

7. The electric toothbrush according to claim 1, characterized in that The shock absorbing component covers at least a portion of the front surface.

8. The electric toothbrush according to claim 1, characterized in that 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.

9. The electric toothbrush according to any one of claims 1 to 8, characterized in that: 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 connection between the edge portion, the middle portion and the peripheral side surface is smoothly transitioned.

10. The electric toothbrush according to claim 9, characterized in that The back side includes a transition surface located in the middle part of the back side and extending along the length direction of the brush plate, and a concave arc surface arranged on the outer side of the transition surface.

11. The electric toothbrush according to any one of claims 1 to 8, characterized in that: The electric toothbrush has a swing mode. In the swing mode, 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°.

12. The electric toothbrush according to claim 11, characterized in that 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°, and the swing frequency of the driving shaft is lower than the vibration frequency of the driving shaft.

13. The electric toothbrush according to claim 12, characterized in that The vibration frequency range of the drive shaft is 10000 Hz / min-40000 Hz / min; and / or the swing frequency of the drive shaft is 200 Hz / min-1000 Hz / min.

14. The electric toothbrush according to claim 11, characterized in that When the driving motor is started, the driving shaft swings for a time T, and the range of T is 0.05s-2s. Within the range of T, the driving shaft swings and its swing angle is less than a preset angle.

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