Electric toothbrush head and electric toothbrush

Abstract

An electric toothbrush head and an electric toothbrush. The electric toothbrush head (10) comprises a brush shank (100), a brush plate (200), bristles (300) and a soft rubber body (400), wherein the brush plate (200) is disposed on the brush shank (100), and the brush plate (200) has a front surface (210) and a back surface (220) opposite each other in the direction of thickness, and has an outer peripheral surface (230) arranged between the front surface (210) and the back surface (220), the front surface (210) being provided with bristle-implanting holes (211); the bristles (300) are disposed in the bristle-implanting holes (211); and the soft rubber body (400) covers the back surface (220) and at least part of the outer peripheral surface (230) of the brush plate (200), the soft rubber body (400) is provided with a through hole (410), and the brush plate (200) is at least partially exposed by the through hole (410).

Description

Electric toothbrush heads and electric toothbrushes Technical Field

[0001] The present application relates to the technical field of oral cleaning appliances, and in particular to an electric toothbrush head and an electric toothbrush. Background Art

[0002] In the related art, the brush plate of an electric toothbrush head is generally made of hard rubber material. In order to improve the user experience and prevent the hard brush plate from colliding with the skin in the mouth and causing discomfort when the user uses the toothbrush, an elastic soft rubber is usually wrapped around the hard brush plate. At present, the elastic soft rubber is usually injection molded together with the hard brush plate. However, during the production process of the electric toothbrush head, it is easy to have the problem of insufficient bonding force between the elastic soft rubber and the hard brush plate, which will cause the elastic soft rubber of the electric toothbrush head to bulge or peel off from the hard brush plate. On the other hand, during the transportation of the electric toothbrush head, due to changes in climate or environment, such as when the temperature changes from a low temperature state to a high temperature state, the elastic soft rubber of the electric toothbrush head will expand and cause bulging or peeling, affecting user use.

[0003] Application Contents

[0004] The main purpose of this application is to propose an electric toothbrush head, which aims to solve the problem of insufficient bonding force between the soft glue and the hard brush plate of the electric toothbrush head.

[0005] To achieve the above-mentioned purpose, the electric toothbrush head proposed in the present application includes a brush rod, a brush plate, bristles and a soft colloid; the brush plate is arranged on the brush rod, and the brush plate has a front and a back side relative to each other in the thickness direction, and the brush plate also has an outer peripheral surface arranged between the front and the back side, and the front side has a bristle planting hole; the bristles are arranged in the bristle planting hole; the soft colloid is wrapped around the back side and at least part of the outer peripheral surface of the brush plate; a through hole is provided on the soft colloid, and the brush plate is partially exposed in the through hole.

[0006] In some embodiments, the through hole is arranged corresponding to the back surface.

[0007] In some embodiments, the brush plate has a neck and a head, one end of the neck is connected to the head, and the other end is connected to the brush rod; the through hole is arranged corresponding to the neck, or the through hole is arranged corresponding to the head.

[0008] In some embodiments, the through hole is circular in shape, and the diameter of the through hole ranges from 0.5 mm to 2.5 mm; and / or,

[0009] The projection area of ​​the through hole toward the brush plate is 0.5 mm 2 -5mm 2 .

[0010] In some embodiments, the back surface is provided with a first protrusion, and the soft colloid has a first groove that matches the first protrusion.

[0011] In some embodiments, the brush plate is provided with a second protrusion that cooperates with the through hole, and the second protrusion is exposed from the through hole.

[0012] In some embodiments, the second protrusion is separable from the hole wall of the through hole.

[0013] In some embodiments, the second protrusion is lower than the outer surface of the soft rubber portion.

[0014] In some embodiments, the number of the through holes is set to be multiple.

[0015] In some embodiments, the through holes are symmetrically arranged about the central axis of the brush rod.

[0016] In some embodiments, the distribution range of the plurality of through holes in the length direction of the brush plate is not less than 6 mm.

[0017] In some embodiments, a step surface is formed at the connection between the neck of the brush plate and the brush rod, the soft colloid wraps the neck and the outer surface of the soft colloid smoothly transitions to the outer surface of the brush rod; or,

[0018] The thickness of the neck of the brush plate is smaller than that of the brush rod. The neck is connected to the brush rod via a concave arc surface. The surface of the soft colloid corresponding to the concave arc surface is also a concave arc surface.

[0019] In some embodiments, the back side includes a transition surface extending along the length direction of the brush plate, and a concave arc surface arranged on the outside of the transition surface, the concave arc surface is U-shaped, and the arm area of ​​the concave arc surface extends toward the neck.

[0020] In some embodiments, the width of the arm region gradually decreases in a direction from the arm region toward the neck.

[0021] In some embodiments, the connection between the arm region of the concave arc surface and the neck region transitions smoothly.

[0022] In some embodiments, a surface of the brush plate is recessed to form a glue groove, and part of the soft plastic part is filled in the glue groove.

[0023] In some embodiments, the glue containing groove is arranged on the front surface of the brush plate, and / or the glue containing groove is arranged on the outer peripheral surface of the brush plate.

[0024] In some embodiments, the glue containing groove is arranged on the back side of the brush plate and is symmetrically arranged about the central axis of the brush rod.

[0025] In some embodiments, there are multiple glue containing grooves, and the brush plate exposed from the through hole is located between the glue containing grooves.

[0026] In some embodiments, the brush rod has a first end and a second end opposite to each other in the length direction, and the first end has a connecting port; the brush plate is arranged at the second end of the brush rod, and the brush plate and the brush rod are injection molded as one piece; the soft colloid is injection molded; the hardness of the soft colloid is less than the hardness of the brush plate and the brush rod.

[0027] The present application also proposes an electric toothbrush, which includes a brush handle and the aforementioned electric toothbrush head, and the electric toothbrush head is connected to the brush handle.

[0028] The technical solution of the present application is to set through holes on the soft colloid so that the gas generated between the soft colloid and the brush plate of the electric toothbrush head during the production process and the transportation process can be discharged from the inside, thereby avoiding the formation of a bonding gap between the two, which would cause the soft colloid to bulge and affect the user's use. At the same time, it can also further enhance the bonding force between the soft colloid and the brush plate to prevent the two from peeling off from each other.

[0029] Furthermore, the back of the brush plate may also include a transition surface extending along the length direction of the brush plate, and a concave arc surface provided on the outside of the transition surface, wherein the concave arc surface is provided in a U-shape, the arm area of ​​the concave arc surface extends toward the neck, and the through hole is provided corresponding to the neck, so as to guide the gas through the arm area of ​​the concave arc surface, thereby being more conducive to gas discharge and enhancing the bonding force between the soft colloid and the brush plate. Alternatively, a glue containing groove is formed on one side of the head of the brush plate, which is recessed toward the other side. The contact area between the soft colloid and the brush plate is increased by the provision of the glue containing groove, thereby preventing the gas between the two from easily gathering together to form a bulge, and avoiding the occurrence of a bonding gap, which leads to insufficient bonding force between the soft colloid and the hard brush plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] FIG1 is a schematic structural diagram of some embodiments of the electric toothbrush head of the present application;

[0032] FIG2 is an exploded view of the electric toothbrush head in FIG1 ;

[0033] FIG3 is a schematic structural diagram of some other embodiments of the electric toothbrush head of the present application;

[0034] FIG4 is an exploded view of the electric toothbrush head in FIG3 ;

[0035] FIG5 is a cross-sectional view of the electric toothbrush head in FIG1 ;

[0036] Figure 6 is an enlarged view of point A in Figure 5;

[0037] FIG7 is an exploded view of the cross-sectional view of the electric toothbrush head in FIG5 ;

[0038] FIG8 is an enlarged view of point B in FIG7;

[0039] FIG9 is an exploded view of the electric toothbrush head in FIG1 from another perspective;

[0040] FIG10 is a top view of the electric toothbrush head in FIG1 with the soft colloid removed.

[0041] Description of Figure Numbers:

[0042] 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

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such 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 in which A and B are satisfied at the same time. 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 mutually 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 this application.

[0046] The present application proposes an embodiment of an electric toothbrush head, which is used in conjunction with an electric toothbrush handle. In the related art, the brush plate of an electric toothbrush head is generally made of hard rubber material. In order to improve the user experience and prevent the hard brush plate from colliding with the skin in the oral cavity and causing discomfort when the user uses the toothbrush, an elastic soft rubber is usually wrapped around the hard brush plate. At present, the elastic soft rubber is usually injection molded into one piece with the hard brush plate. However, during the production process of the electric toothbrush head, it is easy to have the problem of insufficient bonding force between the elastic soft rubber and the hard brush plate, which will cause the elastic soft rubber of the electric toothbrush head to bulge or peel off from the hard brush plate. On the other hand, during the transportation of the electric toothbrush head, due to changes in climate or environment, such as when the temperature changes from a low temperature state to a high temperature state, the elastic soft rubber of the electric toothbrush head will expand and cause bulging or peeling, affecting user use.

[0047] Please refer to Figures 1 to 4. In some embodiments of the present application, the electric toothbrush head 10 includes a brush rod 100, a brush plate 200, bristles 300 and a soft colloid 400; the brush plate 200 is arranged on the brush rod 100, and the brush plate 200 has a front side 210 and a back side 220 opposite to each other in the thickness direction. The brush plate 200 also has an outer peripheral surface 230 arranged between the front side 210 and the back side 220, and the front side 210 has a hair planting hole 211; the bristles 300 are arranged in the hair planting hole 211; the soft colloid 400 is wrapped around the back side 220 and at least part of the outer peripheral surface 230 of the brush plate 200, and a through hole 410 is provided on the soft colloid 400, and part of the brush plate 200 is exposed in the through hole 410.

[0048] Please refer to Figures 1 to 4. In some embodiments of the present application, the electric toothbrush head 10 includes a brush rod 100, a brush plate 200, bristles 300 and a soft colloid 400; the brush rod 100 has a first end 110 and a second end 120 opposite to each other in the length direction, and the first end 110 has a connecting port 111; the brush plate 200 is arranged at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded, and the brush plate 200 has a front face 210 and a back face 220 opposite to each other in the thickness direction. It also has an outer peripheral surface 230 arranged between the front side 210 and the back side 220, and the front side 210 has a bristle planting hole 211; the bristles 300 are arranged in the bristle planting hole 211; the soft colloid 400 is wrapped around the back side 220 of the brush plate 200 and at least part of the outer peripheral surface 230, and the soft colloid 400 is injection molded; the hardness of the soft colloid 400 is less than the hardness of the brush plate 200 and the brush rod 100, and a through hole 410 is provided on the soft colloid 400, and part of the brush plate 200 is exposed in the through hole 410.

[0049] Specifically, the brush rod 100 has a first end 110 and a second end 120, and the first end 110 is provided with a connection port 111, which is used to plug and connect with the main body of the electric toothbrush. The brush plate 200 is provided at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded. The soft colloid 400 is wrapped around the back surface 220 and at least a portion of the outer peripheral surface 230 of the brush plate 200. The soft colloid 400 is injection molded to prevent the harder brush plate 200 from directly contacting the user's oral skin when using the electric toothbrush, thereby improving the user's experience. The soft colloid 400 is transparent and is injection molded with the brush plate 200. It can be molded on the brush plate 200 by secondary injection molding or two-color injection molding, and then the brush plate 200 is subjected to a hair planting process. Alternatively, when the melting point of the bristles is greater than the melting point of the soft colloid 400, the brush plate 200 can be first subjected to a hair planting process, and then the soft colloid 400 can be injection molded on the brush plate 200. There is no specific restriction on this.

[0050] The thickness of the soft colloid 400 ranges from 0.3 mm to 2 mm. Specifically, the 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, or 2.0 mm. Considering the production tolerances, the thickness of the soft colloid 400 can be roughly within the above range. It should be noted that since the soft colloid 400 is wrapped around the back side 220 of the brush plate 200 and at least part of the outer peripheral surface 230, and since the shape of the brush plate 200 has a variety of designs, in order to adapt to the shape of the brush plate 200, the thickness of the soft colloid 400 wrapped around the brush plate 200 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 soft colloid 400 is in the range of 0.3mm to 2mm, it is within the protection scope of this application.

[0051] It is taken into consideration that when the electric toothbrush head 10 is produced, if gas enters between the soft colloid 400 and the brush plate 200, this part of the gas cannot be discharged in time, which will cause a gap between the soft colloid 400 and the brush plate 200, causing the soft colloid 400 to bulge. Or, during the transportation of the electric toothbrush head 10 after production, due to changes in climate or environment, such as when the temperature changes from a low temperature state to a high temperature state, the soft colloid 400 of the electric toothbrush head 10 expands and causes bulging, affecting user use. Therefore, a through hole 410 is optionally provided on the soft colloid 400, one end of the through hole 410 is connected to the atmosphere, and the other end is connected to the space between the soft colloid 400 and the brush plate 200, so that the gas between the soft colloid 400 and the brush plate 200 can be discharged from the through hole 410, thereby avoiding the bulging of the soft colloid 400 and affecting user use. As for the shape of the through hole 410, it can be circular, square, angular or other special shapes, and there is no specific limitation on this. The through hole 410 may be provided at any position corresponding to the back surface 220 of the brush plate 200 , or may be provided at a side wall of the brush plate 200 , and there is no specific limitation on this.

[0052] Referring to Figure 8, in some embodiments, the brush plate 200 has a front side 210 and a back side 220. The front side 210 is provided with a plurality of bristle holes 211, and the through holes 410 are provided corresponding to the back side 220. Specifically, the front side 210 of the brush plate 200 is provided with a plurality of bristle holes, into which bristles 300 can be fixedly mounted. The bristles 300 are composed of a plurality of bristles to clean the user's teeth.

[0053] Please refer to Figures 2, 4, 7 and 8. Furthermore, the brush plate 200 has a neck 240 and a head 250. One end of the neck 240 is connected to the head 250, and the other end is connected to the brush rod 100. The through hole 410 is provided corresponding to the neck 240. Specifically, the bristle pores are provided in the neck 240 of the brush plate 200 and are located on the front side 210 of the brush plate 200. Usually, when a user uses a toothbrush, part of the brush plate 200 and part of the brush rod 100 are extended into the oral cavity, while the bristles 300 are provided on the front side 210 of the brush plate 200. The head 250 of the brush plate 200 mainly cleans the user's teeth. The through hole 410 is provided corresponding to the neck 240 to prevent water, foam, etc. from flowing into the through hole 410 during use, thereby preventing the toothbrush assembly from being contaminated. Among them, the through hole 410 is arranged corresponding to the neck 240, which means that the projection surface of the through hole 410 toward the brush plate 200 is at least partially located on the neck 240. It can be partially located on the neck 240 and partially located on the head 250, that is, the through hole 410 is arranged corresponding to the connection between the head 250 and the neck 240, or it can be entirely located on the neck 240, all within the protection scope of this embodiment.

[0054] Please refer to Figures 1, 2 and 6. In some embodiments, the shape of the through hole 410 is circular, and the diameter of the through hole 410 ranges from 0.5mm to 2.5mm. Specifically, the shape of the through hole 410 can be set to be circular. The circular through hole 410 has a regular shape and is easy to process and produce. Setting the diameter of the through hole 410 between 0.5mm and 2.5mm can, on the one hand, ensure the exhaust effect of the through hole 410, and on the other hand, avoid the situation where the water flow and foam easily flow through the through hole 410 into the space between the soft colloid 400 and the brush plate 200 during brushing when the diameter of the through hole 410 is too large, and dust easily accumulates in the through hole 410 when not in use. The diameter of the through hole 410 can specifically be 0.5mm, 1mm, 1.5mm, 2mm, or 2.5mm. Preferably, the diameter of the through hole 410 ranges from 1mm to 2mm. Within this range, the effect of the through hole 410 is better. The diameter of the through hole 410 can be selected from 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm.

[0055] Referring to Figures 2, 6, and 8, it is worth mentioning that the back surface 220 is provided with a first protrusion 260, and the soft colloid 400 has a first groove 420 that cooperates with the first protrusion 260. Specifically, the first protrusion 260 can be an aesthetically pleasing shape or a letter with a certain meaning. Because the soft colloid 400 is transparent, the user can see the first protrusion 260 through the soft colloid 400. Furthermore, the first protrusion 260 is provided on the back surface 220, and the first groove 420 is formed on the soft colloid 400 to cooperate with the first protrusion 260. This configuration further increases the contact area between the soft colloid 400 and the brush plate 200, thereby further strengthening the bonding force between the brush plate 200 and the soft colloid 400, and preventing the soft colloid 400 from detaching from the toothbrush plate 200 after prolonged use.

[0056] Referring to Figures 3 and 4, in some embodiments, the back surface 220 is provided with a second protrusion 270 that interacts with the through hole 410. The second protrusion 270 is detachable from the wall of the through hole 410. Specifically, the second protrusion 270 can be provided on the back surface 220 of the brush plate 200, and the through hole 410 and the second protrusion 270 interact with each other. The shape of the second protrusion 270 can be aesthetically pleasing or can be a letter with a certain meaning. The second protrusion 270 is detachable from the wall of the through hole 410. When gas is present between the brush plate 200 and the soft colloid 400, the gas can be discharged through the gap between the second protrusion 270 and the wall of the through hole 410, thereby strengthening the bonding force between the soft colloid 400 and the hard brush plate 200. The number of through holes 410 is set to multiple, and correspondingly, the shape of the second protrusion 270 is also set to multiple. The multiple second protrusions 270 can be combined to form a smiley face. This embodiment combines the through hole 410 with the second protrusion 270 , making the electric toothbrush head 10 more aesthetically pleasing and enhancing the bonding force between the soft colloid 400 and the hard brush plate 200 .

[0057] In some embodiments, the shape of the through hole 410 is any one of a circle, a triangle, a rectangle, an arc, an angle, and a pentagon, and the area of ​​the projection surface of the through hole 410 toward the brush plate 200 is 0.5 mm2-5 mm2. Of course, in other embodiments, the shape of the through hole 410 can also be set to other special shapes, and there is no specific limitation on this. It should be emphasized that no matter what shape the through hole 410 is, it is necessary to ensure that the area of ​​the projection surface of the through hole 410 toward the brush plate 200 is within 0.5 mm2. 2 -5mm 2In between, the area of ​​the projection surface refers to the cross-sectional area of ​​the through hole 410 used for exhaust. Such a setting can ensure the exhaust effect of the through hole 410, avoid the exhaust area of ​​the through hole 410 being too small, affecting the exhaust effect of the through hole 410, and avoid the exhaust area of ​​the through hole 410 being too large, so that water and foam can easily flow through the through hole 410 into between the soft gel 400 and the brush plate 200 during brushing, and easily accumulate dust in the through hole 410 when not in use, affecting user use.

[0058] Referring to Figures 2 and 4 , in some embodiments, a stepped surface 500 is formed at the connection between the neck 240 and the brush handle 100, and the soft colloid 400 wraps around the neck 240, with the outer surface of the soft colloid 400 smoothly transitioning to the outer surface of the brush handle 100. Specifically, because the soft colloid 400 wraps around the brush plate 200, if the connection between the neck 240 and the brush handle 100 were smoothly transitioned, after the soft colloid 400 wraps around the neck 240, the cross-sectional area of ​​the soft colloid 400 perpendicular to the length of the brush handle 100 would be larger than the cross-sectional area of ​​the brush handle 100, resulting in a top-heavy feeling, an unsightly overall appearance, and inconvenient use for the user. Therefore, a step surface 500 is formed at the connection between the neck 240 and the brush rod 100, that is, in the cross section perpendicular to the length direction of the brush rod 100, the area of ​​the neck 240 is smaller than the area of ​​the brush rod 100, the soft colloid 400 wraps the neck 240, and the outer surface of the soft colloid 400 and the outer surface of the brush rod 100 are smoothly transitioned, which is convenient for users to use and makes the overall appearance of the electric toothbrush head 10 look more beautiful.

[0059] 1, 2, 5 to 10, in some other embodiments of the present application, the electric toothbrush head 10 includes a brush rod 100, a brush plate 200, bristles 300 and a soft colloid 400; the brush rod 100 has a first end 110 and a second end 120 opposite to each other in the length direction, and the first end 110 has a connecting port 111; the brush plate 200 is arranged at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded, the brush plate 200 includes a neck 240 and a head 250, one end of the neck 240 is connected to the head 250, and the other end is connected to the brush rod 100; the brush plate 200 has a front side 210 and a back side 220 opposite to each other in the thickness direction, and the brush plate 200 also has a front side 210 and a back side 220 arranged on the front side. The outer peripheral surface 230 between the front face 210 and the back face 220, the front face 210 is provided with a hair planting hole 211, the back face 220 includes a transition surface 221 extending along the length direction of the brush plate 200, and a concave arc surface 222 arranged on the outside of the transition surface 221, the concave arc surface 222 is arranged in a U shape, and the arm area 222a of the concave arc surface 222 extends toward the neck 240; the bristles 300 are arranged in the hair planting hole 211; the soft colloid 400 is wrapped around the back face 220 of the brush plate 200 and at least part of the outer peripheral surface 230, the soft colloid 400 is injection molded, and a through hole 410 is provided on the soft colloid 400, the brush plate 200 is partially exposed in the through hole 410, and the through hole 410 is arranged corresponding to the neck 240.

[0060] Specifically, the brush rod 100 has a first end 110 and a second end 120, and the first end 110 is provided with a connection port 111 for plugging into the main body of the electric toothbrush. The brush plate 200 is provided at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded. The soft colloid 400 is wrapped around the back surface 220 and at least a portion of the outer peripheral surface 230 of the brush plate 200. The soft colloid 400 is injection molded to prevent the harder brush plate 200 from directly contacting the user's oral skin when using the toothbrush, thereby improving the user's experience. The soft colloid 400 is transparent and is injection molded with the brush plate 200. It can be molded on the brush plate 200 by secondary injection molding or two-color injection molding, and then the brush plate 200 is subjected to a hair planting process. Alternatively, when the melting point of the bristles is greater than the melting point of the soft colloid 400, the brush plate 200 can be first subjected to a hair planting process, and then the soft colloid 400 can be injection molded on the brush plate 200. There is no specific restriction on this.

[0061] It is taken into consideration that when the electric toothbrush head 10 is in the production process, if gas enters between the soft colloid 400 and the brush plate 200, this part of the gas cannot be discharged in time, which will cause the soft colloid 400 to bulge. Or, during the transportation of the electric toothbrush head 10 after production, due to changes in climate or environment, such as when the temperature changes from a low temperature state to a high temperature state, the soft colloid 400 of the electric toothbrush head 10 expands and bulges, affecting user use. Therefore, a through hole 410 is optionally provided on the soft colloid 400, one end of the through hole 410 is connected to the atmosphere, and the other end is connected to the space between the soft colloid 400 and the brush plate 200, so that the gas between the soft colloid 400 and the brush plate 200 can be discharged from the through hole 410, thereby avoiding the soft colloid 400 from bulging, which affects user use. As for the shape of the through hole 410, it can be circular, square, angular or other special shapes, and there is no specific limitation on this.

[0062] Referring to Figures 2, 4, 7, and 8, the brush plate 200 further comprises a neck 240 and a head 250, one end of the neck 240 being connected to the head 250, and the other end being connected to the brush rod 100. The brush plate 200 comprises a front face 210 and a back face 220, the front face 210 being provided with a plurality of bristle holes 211, the through holes 410 being provided corresponding to the back face 220, and the through holes 410 being provided corresponding to the neck 240. Specifically, the front face 210 of the brush plate 200 is provided with a plurality of bristle holes, in which bristles 300 can be fixedly mounted, the bristles 300 being composed of a plurality of bristles to clean the user's teeth. The bristle pores are provided on the neck 240 of the brush plate 200 and on the front side 210 of the brush plate 200. Usually, when a user uses a toothbrush, part of the brush plate 200 and part of the brush rod 100 are extended into the oral cavity, and the bristles 300 are provided on the front side 210 of the brush plate 200. The head 250 of the brush plate 200 mainly cleans the user's teeth. The through hole 410 is provided corresponding to the neck 240 to prevent water, foam, etc. from flowing into the through hole 410 during use, thereby contaminating the toothbrush assembly. The through hole 410 is provided corresponding to the neck 240, which means that the projection surface of the through hole 410 toward the brush plate 200 is at least partially located on the neck 240. It can be partially located on the neck 240 and partially located on the head 250, that is, the through hole 410 is provided corresponding to the connection between the head 250 and the neck 240, or it can be entirely located on the neck 240, all of which are within the protection scope of this embodiment.

[0063] Referring to Figures 8 to 10 , the back surface 220 includes a transition surface 221 extending along the length of the brush plate 200, and a concave arc surface 222 disposed outside the transition surface 221. The concave arc surface 222 is U-shaped, with its arm region 222a extending toward the neck 240. Specifically, the concave arc surface 222 is an arc surface that is recessed toward the front surface 210 of the brush plate 200. The concave arc surface 222 is disposed outside the transition surface 221 and extends obliquely from the back surface 220 of the brush plate 200 toward the front surface 210. The concave arc surface 222 is generally U-shaped, with its two opposing arm regions 222a extending toward the neck 240. Since the through hole 410 is disposed corresponding to the neck 240, if gas exists between the brush plate 200 and the soft colloid 400, the arm regions 222a of the concave arc surface 222 can guide the gas, thereby further facilitating gas discharge.

[0064] 2 and 10 , the width of the arm region 222a gradually decreases in the direction from the arm region 222a toward the neck 240. This configuration can further guide the gas between the soft colloid 400 and the brush plate 200, allowing the gas to be more easily discharged from the through hole 410 provided on the neck 240.

[0065] Referring to FIG. 2 , in some embodiments, the connection between the arm region 222a of the concave arc surface 222 and the neck region 240 is smoothly transitioned. Specifically, the smooth transition between the arm region 222a of the concave arc surface 222 and the neck region 240 facilitates the production of the regularly shaped brush plate 200 and also facilitates smoother, unimpeded flow of gas through the connection between the arm region 222a of the concave arc surface 222 and the neck region 240, facilitating gas discharge.

[0066] Please refer to Figures 2 and 6. In some embodiments, the shape of the through hole 410 is circular, and the diameter of the through hole 410 ranges from 0.5mm to 2.5mm. Specifically, the shape of the through hole 410 can be set to be circular. The circular through hole 410 has a regular shape and is easy to process and produce. Setting the diameter of the through hole 410 between 0.5mm and 2.5mm can, on the one hand, ensure the exhaust effect of the through hole 410, and on the other hand, avoid the situation where the water flow and foam easily flow through the through hole 410 into the space between the soft colloid 400 and the brush plate 200 during brushing when the diameter of the through hole 410 is too large, and dust easily accumulates in the through hole 410 when not in use. The diameter of the through hole 410 can specifically be 0.5mm, 1mm, 1.5mm, 2mm, or 2.5mm. Preferably, the diameter of the through hole 410 ranges from 1mm to 2mm. Within this range, the effect of the through hole 410 is better. The diameter of the through hole 410 can be selected from 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm.

[0067] Referring to Figures 6 and 8, in some embodiments, the back surface 220 is provided with a first protrusion 260, and the soft colloid 400 has a first groove 420 that cooperates with the first protrusion 260. Specifically, the first protrusion 260 can be an aesthetically pleasing shape or a letter with a certain meaning. Because the soft colloid 400 is transparent, the user can see the first protrusion 260 through the soft colloid 400. Furthermore, the first protrusion 260 is provided on the back surface 220, and the first groove 420 is formed on the soft colloid 400 to cooperate with the first protrusion 260. This configuration further increases the contact area between the soft colloid 400 and the brush plate 200, thereby further strengthening the bonding force between the brush plate 200 and the soft colloid 400, and preventing the soft colloid 400 from detaching from the toothbrush plate 200 after prolonged use.

[0068] In some embodiments of the present application, a surface depression of the brush plate forms a glue-containing groove 223a, and part of the soft glue part 400 is filled in the glue-containing groove 223a. On the one hand, the design of the glue-containing groove 223a can improve the stability of the connection between the soft colloid 400 and the brush plate 200, and prevent the soft colloid 400 from falling off the brush plate 200. On the other hand, the provision of the glue-containing groove 223a increases the contact area between the soft colloid 400 and the brush plate 200. When gas exists between the soft colloid 400 and the brush plate 200, the increased contact area between the soft colloid 400 and the brush plate 200 increases the space available for gas to be accommodated between the two, making it less likely for the gas to gather together and form a bulge.

[0069] In some embodiments of the present application, the adhesive groove 223a is provided on the front surface of the brush plate 200, and / or the adhesive groove 223a is provided on the outer peripheral surface of the brush plate 200. The interface between the soft colloid 400 and the brush plate 200 is provided on the front surface or the outer peripheral surface, and by providing the adhesive groove 223a at the corresponding position, the bonding force at the interface can be effectively improved.

[0070] In some embodiments of the present application, the adhesive groove 223a is provided on the back of the brush plate 200 and is symmetrically arranged about the central axis of the brush rod 100. This makes the weight distribution of the brush plate 200 more uniform, and can ensure the stability of the connection between the soft colloid 400 and the brush plate 200, thereby preventing the soft colloid 400 from falling off the brush plate 200. The soft colloid 400 and the brush plate 200 have a junction at the through hole 410, which is a location prone to peeling. By providing the adhesive groove 223a near the brush plate 200 corresponding to the through hole 410, for example, at 2mm to 5mm, so as to partially fill the soft colloid 400, the peripheral bonding force of the through hole 410 is effectively improved.

[0071] In some embodiments of the present application, there are multiple adhesive grooves 223a, and the brush plate exposed from the through hole 410 is located between the adhesive grooves 223a. This facilitates the discharge of gas between the soft colloid 400 in the adhesive groove and the brush plate 200 through the through hole 410, thereby further preventing the gas from gathering together and forming bulges.

[0072] 1 to 10 , in some further embodiments of the present application, the electric toothbrush head 10 includes a brush rod 100, a brush plate 200, bristles 300 and a soft colloid 400; the brush rod 100 has a first end 110 and a second end 120 opposite to each other in the length direction, the first end 110 has a connecting port 111; the brush plate 200 is arranged at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded, the brush plate 200 has a neck 240 and a head 250, one end of the neck 240 is connected to the head 250, and the other end is connected to the brush rod 100, and one side of the head 250 faces the other One side is recessed to form a glue-containing groove; the brush plate 200 has a front side 210 and a back side 220 opposite to each other in the thickness direction, and the brush plate 200 also has an outer peripheral surface 230 arranged between the front side 210 and the back side 220, and the front side 210 has a bristle planting hole 211; the bristles 300 are arranged in the bristle planting hole 211; the soft colloid 400 is wrapped around the back side 220 and at least part of the outer peripheral surface 230 of the brush plate 200, and the soft colloid 400 is injection molded; a through hole 410 is provided on the soft colloid 400, and the through hole 410 is arranged corresponding to the back side 220, and part of the brush plate 200 is exposed in the through hole 410.

[0073] Specifically, the brush rod 100 has a first end 110 and a second end 120, and the first end 110 is provided with a connection port 111, which is used to plug and connect with the main body of the electric toothbrush. The brush plate 200 is provided at the second end 120 of the brush rod 100, and the brush plate 200 and the brush rod 100 are integrally injection molded. The soft colloid 400 is wrapped around the back surface 220 and at least a portion of the outer peripheral surface 230 of the brush plate 200. The soft colloid 400 is injection molded to prevent the harder brush plate 200 from directly contacting the user's oral skin when using the toothbrush, thereby improving the user's experience. The soft colloid 400 is transparent and is injection molded with the brush plate 200. It can be molded on the brush plate 200 by secondary injection molding or two-color injection molding, and then the brush plate 200 is subjected to a hair planting process. Alternatively, when the melting point of the bristles is greater than the melting point of the soft colloid 400, the brush plate 200 can be first subjected to a hair planting process, and then the soft colloid 400 can be injection molded on the brush plate 200. There is no specific restriction on this.

[0074] Please refer to Figures 1 to 4. It is taken into consideration that when the electric toothbrush head 10 is in the production process, if gas enters between the soft colloid 400 and the brush plate 200, this part of the gas cannot be discharged in time, which will cause the soft colloid 400 to bulge. Or, during the transportation of the electric toothbrush head 10 after production, due to changes in climate or environment, such as when the temperature changes from a low temperature state to a high temperature state, the soft colloid 400 of the electric toothbrush head 10 expands and bulges, affecting user use. Therefore, a through hole 410 is optionally provided on the soft colloid 400, one end of the through hole 410 is connected to the atmosphere, and the other end is connected to the space between the soft colloid 400 and the brush plate 200, so that the gas between the soft colloid 400 and the brush plate 200 can be discharged from the through hole 410, thereby avoiding the soft colloid 400 from bulging and affecting user use. As for the shape of the through hole 410, it can be circular, square, angular or other special shapes, and there is no specific limitation on this. The through hole 410 may be provided at any position corresponding to the back surface 220 of the brush plate 200 , or may be provided at a side wall of the brush plate 200 , and there is no specific limitation on this.

[0075] Please refer to Figure 2 or Figure 4. One side of the head 250 is recessed toward the other side to form a glue-containing groove 223a. When the soft colloid 400 and the brush plate 200 are injection-molded as one, the space in the glue-containing groove 223a is also used to accommodate the soft colloid 400. On the one hand, the design of the glue-containing groove 223a can improve the stability of the connection between the soft colloid 400 and the brush plate 200, and prevent the soft colloid 400 from falling off the brush plate 200. On the other hand, the provision of the glue-containing groove 223a increases the contact area between the soft colloid 400 and the brush plate 200. When there is gas between the soft colloid 400 and the brush plate 200, due to the increase in the contact area between the soft colloid 400 and the brush plate 200, the space that can accommodate the gas between the two is increased, so that the gas will be less likely to gather together to form a bulge.

[0076] Referring to Figure 8, in some embodiments, the brush plate 200 has a front side 210 and a back side 220. The front side 210 is provided with a plurality of bristle holes 211, and the through holes 410 are provided corresponding to the back side 220. Specifically, the front side 210 of the brush plate 200 is provided with a plurality of bristle holes, into which bristles 300 can be fixedly mounted. The bristles 300 are composed of a plurality of bristles to clean the user's teeth.

[0077] Please refer to Figures 1, 2, 5 to 10. Furthermore, the through hole 410 is arranged corresponding to the neck 240, and the back side 220 includes a transition surface 221 extending along the length direction of the brush plate 200, and a concave arc surface 222 arranged on the outside of the transition surface 221. The concave arc surface 222 is U-shaped, and the arm area 222a of the concave arc surface 222 extends toward the neck 240. The glue containing groove 223a is located on the side of the concave arc surface 222 away from the transition surface 221.

[0078] Specifically, the bristle pores are provided on the neck 240 of the brush plate 200 and on the front side 210 of the brush plate 200. Generally, when a user uses a toothbrush, part of the brush plate 200 and part of the brush rod 100 are extended into the oral cavity, and the bristles 300 are provided on the front side 210 of the brush plate 200. The head 250 of the brush plate 200 mainly cleans the user's teeth. The through hole 410 is provided corresponding to the neck 240 to prevent water, foam, etc. from flowing into the through hole 410 during use, thereby contaminating the toothbrush assembly. The through hole 410 is provided corresponding to the neck 240, which means that the projection surface of the through hole 410 toward the brush plate 200 is at least partially located on the neck 240. It can be partially located on the neck 240 and partially located on the head 250, that is, the through hole 410 is provided corresponding to the connection between the head 250 and the neck 240, or it can be entirely located on the neck 240, all of which are within the protection scope of this embodiment.

[0079] Referring to Figures 2, 8, and 10, the back surface 220 includes a transition surface 221 extending along the length of the brush plate 200, and a concave arc surface 222 disposed outside the transition surface 221. The concave arc surface 222 is U-shaped, with its arm region 222a extending toward the neck 240. Specifically, the concave arc surface 222 is a curved surface that is recessed toward the front surface 210 of the brush plate 200. The concave arc surface 222 is disposed outside the transition surface 221 and extends obliquely from the back surface 220 of the brush plate 200 toward the front surface 210. The concave arc surface 222 is generally U-shaped, with its two opposing arm regions 222a extending toward the neck 240. Since the through hole 410 is disposed corresponding to the neck 240, if gas exists between the brush plate 200 and the soft colloid 400, the arm regions 222a of the concave arc surface 222 can guide the gas, thereby further facilitating gas discharge.

[0080] Please continue to refer to Figures 2, 8 and 10. Furthermore, the back side 220 also includes a groove surface 223 provided on the outside of the concave arc surface 222, and the glue containing groove 223a is formed from one side of the groove surface 223 to the other side. Specifically, the groove surface 223 is formed to be concave toward the front side 210. The groove surface 223 can be an arc-shaped groove surface 223 or a rectangular groove surface 223, and there is no specific limitation on this. The provision of the groove surface 223 can further enhance the stability of the connection between the soft colloid 400 and the brush plate 200, and prevent the soft colloid 400 from easily falling off the brush plate 200. The glue containing groove 223a is formed by passing through from one side of the groove surface 223 to the other side, that is, the glue containing groove 223a is located between the concave arc surface 222 and the front side 210 of the brush plate 200.

[0081] Referring to Figures 3 and 4 , in other embodiments, the back surface 220 includes a transition surface 221 extending along the length of the brush plate 200, and a groove surface 223 disposed outside the transition surface 221. The adhesive-containing groove 223a is formed from one side of the groove surface 223 to the other side, and the connection between the groove surface 223 and the neck 240 is smoothly transitioned. Specifically, the groove surface 223 can be directly disposed outside the transition surface 221 to increase the contact area between the soft colloid 400 and the brush plate 200, thereby preventing gas from gathering and forming bulges.

[0082] Referring to FIG. 2 , in some embodiments, the concave arc surface 222 and the groove surface 223 are connected to the neck 240 with a smooth transition. Specifically, the smooth transition at the connection between the concave arc surface 222 and the groove surface 223 and the neck 240 facilitates the production of the regularly shaped brush plate 200. Furthermore, the smooth transition allows for smoother, unimpeded gas flow through the connection between the arm region 222a of the concave arc surface 222 and the neck 240, thereby facilitating gas discharge and enhancing the bonding strength between the soft colloid 400 and the hard brush plate 200.

[0083] Please refer to Figures 1 and 2. In some embodiments, the shape of the through hole 410 is circular, and the diameter of the through hole 410 ranges from 0.5mm to 2.5mm. Specifically, the shape of the through hole 410 can be set to be circular, and the circular through hole 410 has a regular shape and is easy to process and produce. Setting the diameter of the through hole 410 between 0.5mm and 2.5mm can, on the one hand, ensure the exhaust effect of the through hole 410, and on the other hand, avoid the situation where the water flow and foam easily flow through the through hole 410 into the space between the soft colloid 400 and the brush plate 200 during brushing when the diameter of the through hole 410 is too large, and dust easily accumulates in the through hole 410 when not in use. Among them, the diameter of the through hole 410 can specifically be 0.5mm, 1mm, 1.5mm, 2mm, and 2.5mm. Preferably, the diameter of the through hole 410 ranges from 1mm to 2mm. Within this range, the effect of the through hole 410 is better. The diameter of the through hole 410 can be selected from 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm.

[0084] Referring to Figures 2, 6, and 8, in some embodiments, the back surface 220 is provided with a first protrusion 260, and the soft colloid 400 has a first groove 420 that cooperates with the first protrusion 260. Specifically, the first protrusion 260 can be an aesthetically pleasing shape or a letter with a certain meaning. Because the soft colloid 400 is transparent, the user can see the first protrusion 260 through the soft colloid 400. Furthermore, the first protrusion 260 is provided on the back surface 220, and the first groove 420 is formed on the soft colloid 400 to cooperate with the first protrusion 260. This configuration further increases the contact area between the soft colloid 400 and the brush plate 200, thereby further strengthening the bonding force between the brush plate 200 and the soft colloid 400, and preventing the soft colloid 400 from detaching from the toothbrush plate 200 after prolonged use.

[0085] Please refer to Figure 4. In other embodiments, the number of the through holes 410 is set to multiple, and the back surface 220 is provided with multiple second protrusions 270 that cooperate with the multiple through holes 410. The second protrusions 270 are separable from the hole walls of the through holes 410. Specifically, a second protrusion 270 can also be provided on the back surface 220 of the brush plate 200, and the through holes 410 and the second protrusions 270 cooperate with each other. The shape of the second protrusion 270 can be an aesthetically pleasing shape or a letter with a certain meaning. The second protrusion 270 is separable from the hole wall of the through hole 410. When gas exists between the brush plate 200 and the soft colloid 400, the gas can be discharged from the gap between the second protrusion 270 and the hole wall of the through hole 410, while also further enhancing the bonding force between the soft colloid 400 and the hard brush plate 200. The number of through holes 410 is set to be multiple, and correspondingly, the shape of the second protrusion 270 is also set to be multiple, and the multiple second protrusions 270 can be combined to form a smiley face. This embodiment combines the through holes 410 with the second protrusions 270, making the electric toothbrush head 10 more aesthetically pleasing and enhancing the bonding strength between the soft colloid 400 and the hard brush plate 200.

[0086] The technical solution of the present application is to set a through hole 410 on the soft colloid 400, so that the gas generated between the soft colloid 400 and the brush plate 200 of the electric toothbrush head 10 during the production process and the transportation process is discharged from the inside, avoiding the formation of a bonding gap between the two, which would cause the soft colloid 400 to bulge and affect the user's use. At the same time, it can also further enhance the bonding force between the soft colloid 400 and the brush plate 100 to avoid the two from peeling off from each other. Furthermore, the back side 220 of the brush plate 200 may also include a transition surface 221 extending along the length of the brush plate 200, and a concave arc surface 222 provided on the outside of the transition surface 221. The concave arc surface 222 is provided in a U-shape, and the arm area 222a of the concave arc surface 222 extends toward the neck 240. The through hole 410 is provided corresponding to the neck 240 to guide the gas through the arm area 222a of the concave arc surface 222, thereby further facilitating the gas discharge and enhancing the bonding force between the soft colloid 400 and the brush plate 100. Alternatively, a glue-containing groove 223a is formed on one side of the head 250 of the brush plate 200, which is recessed toward the other side. The provision of the glue-containing groove 223a increases the contact area between the soft colloid 400 and the brush plate 200, thereby preventing the gas between the two from easily gathering together to form a bulge, and avoiding the formation of a bonding gap, which results in insufficient bonding force between the soft colloid 400 and the hard brush plate 200.

[0087] In some embodiments of the present application, the through hole 410 is provided corresponding to the head 250 .

[0088] In some embodiments of the present application, the through hole 410 is symmetrically arranged about the central axis of the brush rod 100, so that the exhaust paths between the soft colloid and the brush plate 200 on both sides of the through hole 410 are symmetrically arranged, which facilitates exhaust.

[0089] In some embodiments of the present application, the second protrusion 270 is lower than the outer surface of the soft colloid 400, thereby preventing the second protrusion 270 from contacting the teeth or oral soft components, thereby ensuring the shock-absorbing effect of the entire electric toothbrush head.

[0090] This application also provides an electric toothbrush comprising the aforementioned electric toothbrush head and a brush handle, wherein the electric toothbrush head is connected to the brush handle. The specific structure of the electric toothbrush head is similar to that of the above-mentioned embodiments. Since this electric toothbrush adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be detailed here.

[0091] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification 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 head, wherein: The electric toothbrush head comprises: Brush rod; A brush plate is arranged on the brush rod, the brush plate has a front side and a back side opposite to each other in the thickness direction, the brush plate also has an outer peripheral surface arranged between the front side and the back side, and the front side has hair planting holes; Bristles are disposed in the hair implantation holes; and A soft colloid is wrapped around the back surface and at least a portion of the outer peripheral surface of the brush plate; a through hole is provided on the soft colloid, and a portion of the brush plate is exposed in the through hole.

2. The electric toothbrush head according to claim 1, wherein: The through hole is arranged corresponding to the back surface.

3. The electric toothbrush head according to claim 1 or 2, wherein: The brush plate has a neck and a head, one end of the neck is connected to the head, and the other end is connected to the brush rod; The through hole is arranged corresponding to the neck, or the through hole is arranged corresponding to the head.

4. The electric toothbrush head according to any one of claims 1 to 3, wherein: The through hole is circular in shape, and the diameter of the through hole is in the range of 0.5 mm to 2.5 mm; and / or, The projection area of ​​the through hole toward the brush plate is 0.5 mm 2 -5mm 2 .

5. The electric toothbrush head according to any one of claims 1 to 4, wherein: The back surface is provided with a first protrusion, and the soft colloid has a first groove matched with the first protrusion.

6. The electric toothbrush head according to any one of claims 1 to 5, wherein: The brush plate is provided with a second protrusion that cooperates with the through hole, and the second protrusion is exposed from the through hole.

7. The electric toothbrush head according to claim 6, wherein: The second protrusion is separable from the hole wall of the through hole.

8. The electric toothbrush head according to claim 6, wherein: The second protrusion is lower than the outer surface of the soft rubber portion.

9. The electric toothbrush head according to any one of claims 1 to 8, wherein: The number of the through holes is set to be plural.

10. The electric toothbrush head according to any one of claims 1 to 9, wherein: The through holes are symmetrically arranged about the central axis of the brush rod.

11. The electric toothbrush head according to any one of claims 1 to 10, wherein: The distribution range of the through holes in the length direction of the brush plate is not less than 6 mm.

12. The electric toothbrush head according to any one of claims 1 to 11, wherein: A step surface is formed at the connection between the neck of the brush plate and the brush rod, the soft colloid wraps the neck, and the outer surface of the soft colloid smoothly transitions with the outer surface of the brush rod; or, The thickness of the neck of the brush plate is smaller than the thickness of the brush rod, and the neck is connected to the brush rod via a concave arc surface. The surface of the soft colloid corresponding to the concave arc surface is also a concave arc surface.

13. The electric toothbrush head according to any one of claims 1 to 12, wherein: The back side includes a transition surface extending along the length direction of the brush plate, and a concave arc surface arranged outside the transition surface, the concave arc surface is arranged in a U shape, and the arm area of ​​the concave arc surface extends toward the neck.

14. The electric toothbrush head according to claim 13, wherein: The width of the arm region gradually decreases in a direction from the arm region toward the neck.

15. The electric toothbrush head according to claim 14, wherein: The connection between the arm area of ​​the concave arc surface and the neck is smoothly transitioned.

16. The electric toothbrush head according to any one of claims 1 to 15, wherein: The surface of the brush plate is concave to form a glue containing groove, and part of the soft glue part is filled in the glue containing groove.

17. The electric toothbrush head according to claim 16, wherein: The glue containing groove is arranged on the front surface of the brush plate, and / or the glue containing groove is arranged on the outer peripheral surface of the brush plate.

18. The electric toothbrush head according to claim 16, wherein: The glue containing groove is arranged on the back side of the brush plate and is symmetrically arranged about the central axis of the brush rod.

19. The electric toothbrush head according to claim 18, wherein: The number of the adhesive containing grooves is multiple, and the brush plate exposed from the through hole is located between the adhesive containing grooves.

20. The electric toothbrush head according to any one of claims 1 to 19, wherein: The brush rod has a first end and a second end opposite to each other in the length direction, and the first end has a connecting port; the brush plate is arranged at the second end of the brush rod, and the brush plate and the brush rod are integrally injection molded; the soft colloid is injection molded; the hardness of the soft colloid is less than the hardness of the brush plate and the brush rod.

21. An electric toothbrush, wherein: It comprises a brush handle and an electric toothbrush head as claimed in any one of claims 1 to 20, wherein the electric toothbrush head is connected to the brush handle.

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