CN216933571U - Electric toothbrush head and electric toothbrush - Google Patents

Abstract

The utility model discloses an electric toothbrush head and an electric toothbrush, wherein the electric toothbrush head comprises: including the brush head body, brush hair and flexible piece, the brush head body includes brush pole portion and brush board portion, but brush board portion relative brush pole portion elastic deformation between natural state and elastic deformation state, and the relative brush pole portion's of brush board portion flexible angle is not less than 10, the elastic deformation state includes first deformation state and second deformation state, the relative brush pole portion of brush board portion is towards positive side bending deformation under first deformation state, the relative brush pole portion of brush board portion is towards dorsal part bending deformation under second deformation state, the brush holder of electric toothbrush is suitable for connecting to the second end of brush pole portion, brush pole portion transmits the vibration that electric toothbrush's brush holder produced to brush board portion, the hardness of flexible piece is less than the hardness of brush board portion and the at least part of parcel brush board portion, therefore, electric toothbrush head can compromise better and hold performance and cleaning performance.

Description

Electric toothbrush head and electric toothbrush

Technical Field

The utility model relates to the technical field of oral cleaning, in particular to an electric toothbrush head and an electric toothbrush.

Background

The electric toothbrush is convenient and labor-saving to use, and has good cleaning force, so the electric toothbrush is popular with a plurality of users. Some electric toothbrushes of the related art achieve cleaning of teeth by driving a brush head to vibrate. But have vibration amplitude not enough, lead to the poor problem of clean dynamics, promote clean dynamics through the motor that sets up bigger amplitude among the correlation technique, nevertheless have the problem of shaking the hand when motor vibration amplitude is too big, can't realize clean dynamics and the balance of holding experience.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an electric toothbrush head, which has a larger amplitude, and can avoid the hand-shaking phenomenon caused by using a large-amplitude motor, and has the effects of excellent cleaning effect and good holding experience.

The utility model also provides an electric toothbrush adopting the electric toothbrush head.

An electrically powered toothbrush head according to an embodiment of the first aspect of the utility model comprising: the method comprises the following steps: the toothbrush head comprises a toothbrush head body, the toothbrush head body comprises a toothbrush rod part and a toothbrush plate part, the toothbrush rod part comprises a first end and a second end which are opposite in the length direction, the brush plate part is connected with the first end of the brush rod part, the two sides of the thickness of the brush plate part are respectively a front side and a back side, the brush plate portion is elastically deformable between a natural state and an elastically deformed state with respect to the brush rod portion, and the deformable angle of the brush plate part relative to the brush rod part is not less than 10 degrees, the elastic deformation state comprises a first deformation state and a second deformation state, the brush plate portion is bent and deformed toward the front side with respect to the brush shaft portion in the first deformed state, the brush plate portion is bent and deformed toward the back side with respect to the brush shaft portion in the second deformed state, the second end of the brush rod part is suitable for being connected with a brush handle of an electric toothbrush, and the brush rod part transmits the vibration generated by the brush handle of the electric toothbrush to the brush plate part; the two ends of the length of each bristle are respectively a root part and a head part, the root parts of the bristles are directly or indirectly connected with the brush board part, and the head parts of the bristles extend out from the front side of the brush board part; a flexible member, the hardness of which is smaller than the hardness of the brush plate portion, and the flexible member includes at least one of a first flexible portion provided on a back side of the brush plate portion, a second flexible portion provided on a peripheral side of the brush plate portion, and a third flexible portion provided on a front side of the brush plate portion.

According to the electric toothbrush head disclosed by the embodiment of the utility model, the brush plate part with the deformable angle of not less than 10 degrees relative to the brush rod part is arranged, so that on one hand, the amplitude of the electric toothbrush head can be improved, the reaction impact force of teeth is buffered through the elastic deformation of the brush rod part, the amplitude can be increased without using a motor with larger amplitude to improve the cleaning effect, the soft scraping force of elastic soft vibration is realized, the problem of shaking hands can be avoided, and the cleaning force and the holding experience are both considered; on the other hand, through setting up the at least part of flexible piece parcel brush board portion, when the amplitude of electric toothbrush head is great, can improve the problem of brush board portion and the direct rigid contact of soft parts such as flank of tooth, gum, oral cavity internal epidermis more effectively to improve and use the travelling comfort.

In some embodiments, the flexible member includes both the first flexible portion and a second flexible portion, and the second flexible portion has a thickness less than a thickness of the first flexible portion; and/or the flexible piece comprises the first flexible part and a third flexible part at the same time, and the thickness of the third flexible part is smaller than that of the first flexible part.

In some embodiments, the first flexible portion has a thickness greater than 1/2 a thickness of the brash section.

In some embodiments, the flexible member includes both the first flexible portion and the second flexible portion, the first flexible portion extending toward the peripheral side surface of the brush plate portion and being connected to the second flexible portion; and/or the flexible piece comprises a third flexible part and a second flexible part at the same time, and the third flexible part extends to the peripheral side surface of the brush plate part and is connected with the second flexible part.

In some embodiments, the flexible member includes all of the first flexible portion, the second flexible portion, and the third flexible portion, and completely surrounds the brush plate portion except for avoiding the bristles.

In some embodiments, the flexible member includes the first flexible portion, a groove portion is formed on a back surface of the shaft portion, and the flexible member further includes an extension portion filled in the groove portion and connected to the first flexible portion, the groove portion including at least one flared section having an increasing width in a direction from the brush plate portion to the shaft portion to hinder the extension portion from being separated from the shaft portion when the brush plate portion is elastically deformed.

In some embodiments, the width of the groove portion gradually decreases and then gradually increases in a direction from the brush plate portion to the brush shaft portion.

In some embodiments, the brush plate portion is formed as an elastic brush plate that is bendable and twistable itself.

In some embodiments, a dimension of at least a portion of the brush bar portion in a thickness direction of the brush bar portion is greater than a maximum thickness of the brush plate portion.

In some embodiments, a cross-sectional area of an end of the brush plate portion that connects to the shaft portion is smaller than a cross-sectional area of an end of the brush shaft portion that connects to the brush plate portion, such that the brush head body forms a sudden change in cross-section between the brush plate portion and the shaft portion.

In some embodiments, portions of the flexible member are located at the abrupt changes in cross-section to provide a smooth transition of the outer surface of the powered toothbrush head at the junction of the blade portion and the shaft portion.

In some embodiments, the brush plate portion and the brush rod portion are integrally formed, and/or the material of the brush plate portion is polystyrene.

In some embodiments, the brush plate portion and the brush shaft portion are separate pieces, and the brush head body further includes a connecting portion through which the brush plate portion and the brush shaft portion are connected.

In some embodiments, the connecting portion is disposed on a back side of the brush plate portion, the connecting portion and the brush rod portion are integrally formed, and a portion of the flexible member is disposed between and connects the connecting portion and the brush plate portion.

In some embodiments, the connecting portion is disposed between and connects the brush plate portion and the brush rod portion along a length extending direction of the brush rod portion, and an elastic deformation capability of the connecting portion is greater than an elastic deformation capability of any one of the brush plate portion and the brush rod portion.

In some embodiments, the brush plate portion has a mounting hole formed therein, and the root of the bristle is provided in the mounting hole.

In some embodiments, a plurality of annular protrusions are formed on the front side surface of the brush plate portion, the inner ring of each annular protrusion forms the mounting hole, the flexible member includes the third flexible portion, an avoiding hole for avoiding the annular protrusions is formed in the third flexible portion, and the thickness of the third flexible portion is not greater than the height of the annular protrusions.

In some embodiments, the height of the annular protrusion is no more than 2 mm; and/or the annular bulge is soft.

In some embodiments, the mounting hole is a through hole, the root of the bristle is thermally fused to the mounting hole, and the flexible member includes the first flexible portion covering the mounting hole.

In some embodiments, the bristles form a heat-fusible connecting sheet on a back side of the brush plate portion, the heat-fusible connecting sheet extending to a peripheral region of the mounting hole, and the first flexible portion covers the heat-fusible connecting sheet.

In some embodiments, an annular rib extending along the edge of the brush plate portion is formed on the back side of the brush plate portion, the hot-melt connecting sheet is arranged in an inner ring area of the annular rib, the thickness of the hot-melt connecting sheet is smaller than or equal to the height of the annular rib, and the first flexible portion covers the inner ring area of the annular rib and extends to an outer ring area of the annular rib.

In some embodiments, the brush plate portion has a pre-hot-melting state and a post-hot-melting state, in the pre-hot-melting state, the back surface of the brush plate portion has a hot-melting structure located on the periphery of the mounting hole, the hot-melting structure includes a chamfered surface and/or a hot-melting column, the chamfered surface extends obliquely in the radial direction of the mounting hole along the direction away from the mounting hole toward the direction close to the brush plate portion, and in the post-hot-melting state, the hot-melting connecting sheet and the hot-melting structure are welded into a whole.

In some embodiments, at least one of the mounting holes is provided with a mounting tube, the root of the bristle is connected in the mounting tube, and the mounting tube is an elastic tube and is synchronously and elastically deformed with the brush plate part.

An electric toothbrush according to an embodiment of a second aspect of the present invention comprises: a handle and a brush head assembly, the brush head assembly being the electric toothbrush head of any of the above embodiments. Therefore, the overall performance of the electric toothbrush can be improved by arranging the electric toothbrush head.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

figure 1 is a perspective view of a powered toothbrush head according to a first embodiment of the present invention;

figure 2 is a top plan view of a powered toothbrush head according to a first embodiment of the present invention;

figure 3 is a front elevational view of a powered toothbrush head according to a first embodiment of the present invention;

figure 4 is an angled cross-sectional schematic view of the powered toothbrush head according to the first embodiment of the present invention;

figure 5 is a schematic cross-sectional view of another angle of the powered toothbrush head according to the first embodiment of the present invention;

figure 6 is a schematic perspective view of the head body of the powered toothbrush head according to the first embodiment of the present invention;

figure 7 is a top plan view of a powered toothbrush head according to a first embodiment of the present invention;

figure 8 is a schematic view of bristles of a powered toothbrush head according to an embodiment of the utility model;

figure 9 is a schematic perspective view of the flexible member of the powered toothbrush head according to the first embodiment of the present invention;

figure 10 is a perspective view of a powered toothbrush head according to a second embodiment of the present invention;

figure 11 is a top plan view of a powered toothbrush head according to a second embodiment of the utility model;

figure 12 is a front elevational view of a powered toothbrush head according to a second embodiment of the utility model;

figure 13 is an angled cross-sectional schematic view of a powered toothbrush head according to a second embodiment of the utility model;

figure 14 is a schematic view of the engagement of the bristles of a powered toothbrush head according to a second embodiment of the utility model with a flexible member;

figure 15 is a perspective view of a powered toothbrush head according to a third embodiment of the utility model;

figure 16 is an angled cross-sectional schematic view of a powered toothbrush head according to a third embodiment of the utility model;

figure 17 is a schematic view of the head body of a powered toothbrush head according to a third embodiment of the utility model;

figure 18 is a schematic view of the flexible member of a powered toothbrush head according to a third embodiment of the utility model.

Reference numerals:

the power-driven toothbrush head 100 is,

a brush head body 10, a brush rod part 11, a first end 11a, a second end 11b, a groove part 111, a brush plate part 12, a front side 12a, a back side 12b, an annular convex rib 121, a hot melting structure 122, an annular bulge 125,

the number of bristles 20, root 21, head 22,

the flexible member 30, the first flexible portion 31, the extension portion 32, the second flexible portion 33, the third flexible portion 34,

a connecting portion 40 to which the tube 50 is attached; dodge hole a, mounting hole b.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

An electric toothbrush head 100 and an electric toothbrush according to an embodiment of the present invention will be described with reference to fig. 1-18.

As shown in fig. 1-3, a powered toothbrush head 100 according to an embodiment of the utility model includes: a head body 10, bristles 20, and a flexible member 30.

As shown in fig. 4 to 6, the brush head body 10 includes a brush rod portion 11 and a brush plate portion 12, the brush rod portion 11 includes a first end 11a and a second end 11b opposite to each other in a length direction, the brush plate portion 12 is connected to the first end 11a of the brush rod portion 11, two sides of a thickness of the brush plate portion 12 are a front side 12a and a back side 12b, respectively, the brush plate portion 12 is elastically deformable between a natural state and an elastically deformable state with respect to the brush rod portion 11, a deformable angle of the brush plate portion 12 with respect to the brush rod portion 11 is not less than 10 °, the elastically deformable state includes a first deformable state in which the brush plate portion 12 is bent and deformed toward the front side 12a with respect to the brush rod portion 11, and a second deformable state in which the brush plate portion 12 is bent and deformed toward the back side 12b with respect to the brush rod portion 11.

It should be noted that the deformable angle of the brush plate portion 12 relative to the brush rod portion 11 is not less than 10 °, which means that one end of the brush plate portion 12 is a fixed end connected to the first end 11a of the brush rod portion 11, the other end of the brush plate portion 12 is a free end, a connection line between the fixed end and the free end of the brush plate portion 12 is an initial connection line when the brush plate portion 12 is in a natural state relative to the brush rod portion 11, the connection line is an instantaneous connection line when the brush plate portion 12 is in an elastic deformation state relative to the brush rod portion 11, and an included angle between the instantaneous connection line and the initial connection line can be changed between 0 ° and X °, where X ° is not less than 10 °, for example, X ° can be 10 °, 12 °, 14 °, 16 °, 18 °, 20 °, 22 °, 24 °, 18 °, 20 °, 22 °, 24 °, 26 °, 28 °, 30 °, 32 °, 34 °, 36 °, where X ° is not less than 10 ° 38 °, 40 °, 42 °, 44 °, 45 °, and so on.

With reference to fig. 1 and 5, the second end 11b of the brush rod part 11 is suitable for connecting the brush handle of the electric toothbrush, the vibration generated by the brush handle of the electric toothbrush is transmitted to the brush board part 12 by the brush rod part 11, because the brush board part 12 can elastically deform between the natural state and the elastic deformation state relative to the brush rod part 11, and the deformable angle of the brush board part 12 relative to the brush rod part 11 is not less than 10 °, the elastic body can generate a soft vibration effect when vibrating, so that the brush board part 12 has a larger amplitude, the cleaning effect is improved without using a motor with a larger amplitude, and the problem of hand vibration caused by a motor with a large amplitude can be effectively avoided. Therefore, both cleaning force and holding experience can be considered.

Moreover, the brush plate part 12 can be elastically deformed between a natural state and an elastic deformation state relative to the brush rod part 11, and the deformable angle of the brush plate part 12 relative to the brush rod part 11 is not less than 10 degrees, so that when the reaction force of the bristles 20 on teeth reaches a threshold value, the brush plate part 12 can be elastically deformed to buffer the pressure of the bristles 20, the pressure of the brush plate part 12 on the tooth surface and the gum through the bristles 20 is reduced, and the scraping force of the bristles 20 is relatively softer.

In addition, since the brush plate portion 12 is elastically deformable between the natural state and the elastically deformed state with respect to the brush shaft portion 11, and the deformable angle of the brush plate portion 12 with respect to the brush shaft portion 11 is not less than 10 °, it is possible to make the brush plate portion 12 more fit to teeth in different areas of the same user, and to better adapt to tooth surface shapes of teeth of different users, so as to improve the cleaning effect.

The term "the plate portion 12 is bent and deformed toward the front side 12a with respect to the stem portion 11 in the first deformed state" and "the plate portion 12 is bent and deformed toward the back side 12b with respect to the stem portion 11 in the second deformed state" means that the plate portion 12 is bent and deformed in any direction toward the front side 12a with respect to the stem portion 11 in the first deformed state, and for example, both sides of the width of the plate portion 12 are left and right sides, respectively, and may be bent toward the left side of the front side of the plate portion 12, may be bent toward the right side of the front side of the plate portion 12, may be bent toward the middle of the front side of the plate portion 12, and the like, and the plate portion 12 is bent and deformed in any direction toward the back side 12b with respect to the stem portion 11 in the second deformed state, and for example, both sides of the width of the plate portion 12 are left and right sides, respectively, and may be bent toward the left side of the back side of the plate portion 12, and toward the back side of the plate portion 12, But may also be curved toward the middle of the back side of the brush plate portion 12, etc. Therefore, the mouth cleaner can be better suitable for different oral shapes and different positions in the oral cavity, and has both use comfort and cleaning thoroughness.

As shown in fig. 8, the two ends of the length of the brush 20 are a root 21 and a head 22, the root 21 of the brush 20 is directly or indirectly connected to the brush plate portion 12 (for example, the direct fixation may be the adhesive fixation, the heat fusion fixation, etc. of the brush plate portion 12 and the brush 20, or the indirect fixation may be the fixation of the brush 20 to a bracket, the bracket being fixed to the brush plate portion 12, etc.), and the head 22 of the brush 20 extends from the front side 12a of the brush plate portion 12, and may extend perpendicularly outward, or obliquely outward with a certain angle (i.e., with a certain angle to the normal of the brush plate portion 12).

As shown in fig. 1 and 4, the flexible member 30 has a hardness smaller than that of the brush plate portion 12, and the flexible member 30 includes at least one of a first flexible portion 31, a second flexible portion 33, and a third flexible portion 34, wherein the first flexible portion 31 is disposed on the back side of the brush plate portion 12, the second flexible portion 33 is disposed on the peripheral side of the brush plate portion 12, and the third flexible portion 34 is disposed on the front side of the brush plate portion 12, so that the flexible member 30 can wrap at least a portion of the brush plate portion 12, and the relatively soft flexible member 30 can be used to reduce the rigid contact between the brush plate portion 12 and the oral cavity surface, or the gum surface, or the tooth surface, thereby improving the comfort level. Moreover, the relatively hard brush plate part 12 is beneficial to the fixed connection of the brush bristles 20, so that the connection reliability of the brush bristles 20 can be ensured. In addition, since the flexible member 30 is relatively soft, it does not affect the elastic deformation of the brush plate portion 12, and it is ensured that the brush plate portion 12 can be elastically deformed effectively.

As shown in fig. 1, 4 and 9, the flexible member 30 includes at least a first flexible portion 31, and the first flexible portion 31 is located on a side of the root 21 of the bristle 20 away from the head 22 and covers at least a portion of the back surface of the brush portion 12. Therefore, the first flexible portion 31 can cover at least part of the back side 12b of the brush plate portion 12 while shielding the back side of the brush 20, so that the brush 20 can be protected, the connection reliability between the brush 20 and the brush plate portion 12 can be improved, a flexible layer can be formed on the back side 12b of the brush plate portion 12, the collision of the back side 12b of the brush plate portion 12 to the oral cavity can be reduced, the use comfort of a user can be further improved, and the first flexible portion 31 can more effectively protect the surface of the oral cavity when the brush 20 is relatively greatly and reversely elastically deformed by the reaction force of the tooth surface due to the relatively large amplitude of the brush plate portion 12 in the embodiment of the present invention.

As shown in fig. 1 and 9, the flexible member 30 includes at least a second flexible portion 33, and the second flexible portion 33 covers at least a portion of the circumferential side surface of the brush plate portion 12. For example, when the user turns the brush plate portion 12 from the outer tooth surface side to the inner tooth surface side or from the inner tooth surface side to the outer tooth surface side in the use of the electric toothbrush, the peripheral side of the brush plate portion 12 is likely to collide with the teeth, and for example, when the brush 20 cleans the tooth surface, the vibration of the brush plate portion 12 in the width direction thereof is likely to cause the peripheral side of the brush plate portion 12 to impact the oral cavity surface, and further, for example, when the line connecting the longitudinal line of the brush plate portion 12 and the center of each tooth surface is inclined, the peripheral side of the brush plate portion 12 is likely to impact the oral cavity surface, and the like, whereby at least part of the peripheral side surface of the brush plate portion 12 is wrapped with the relatively soft second flexible portion 33, so that the rigid contact between the peripheral side surface of the brush plate portion 12 and the oral cavity surface, the gum surface, the tooth surface, or the like can be reduced as much as possible, and the use comfort can be improved.

As shown in fig. 12-14, the flexible member 30 at least includes a third flexible portion 34, the third flexible portion 34 covers at least a portion of the front side surface of the brush plate portion 12, an avoiding hole a is formed in the third flexible portion 34, and a portion of the bristles 20 located on the front side 12a of the brush plate portion 12 passes through the avoiding hole a. Therefore, when the user uses the electric toothbrush with a large force and presses the brush plate portion 12 in the direction of the tooth surface, the brush 20 may be deformed to a large extent in contact with the tooth surface, and the front surface of the brush plate portion 12 may contact the tooth surface or the gum, so that at least a part of the front surface of the brush plate portion 12 is covered with the third flexible portion 34, which is relatively soft, thereby reducing the rigid contact between the front surface of the brush plate portion 12 and the gum surface, the tooth surface, or the like as much as possible and improving the use comfort.

The first flexible portion 31, the second flexible portion 33 and the third flexible portion 34 may be made of the same material, such as soft glue, specifically, silicone rubber, etc.

In some embodiments, as shown in fig. 1 and 9, the flexible member 30 includes both the first flexible portion 31 and the second flexible portion 33, so that a better flexible barrier can be formed from the back side and the peripheral side of the brush plate portion 12, resulting in better and more comprehensive protection for the oral cavity, the gingival tooth surface, and the like.

Alternatively, when the flexible member 30 includes both the first flexible portion 31 and the second flexible portion 33, the thickness of the second flexible portion 33 is smaller than that of the first flexible portion 31. Thereby, the peripheral side edge of the flexible member 30 can be narrowed, and the width of the brush plate portion 12 is relatively wide, so that the area of the region for arranging the bristles 20 on the brush plate portion 12 is larger, and the range in which the bristles 20 can be set is larger.

Illustratively, the thickness of the second flexible portion 33 is not more than 1mm, so that the distribution area of the second flexible portion 33 on the circumferential side of the brush plate portion 12 is better prevented from being too large, and the distribution of the bristles 20 is prevented from being affected.

Alternatively, when the flexible member 30 includes both the first flexible portion 31 and the second flexible portion 33, the first flexible portion 31 extends toward the peripheral side surface of the brush plate portion 12 to be connected to the second flexible portion 33. It is understood that the first flexible portion 31 extends along the length and width of the back side 12b of the brush plate portion 12, while the second flexible portion 33 surrounds the circumferential edge of the first flexible portion 31 and extends along the thickness of the brush plate portion 12, and when the first flexible portion 31 is connected to the second flexible portion 33, the back side 12b and at least a portion of the circumferential side of the brush plate portion 12 can be covered.

Therefore, on one hand, the connection stability of the flexible part 30 and the brush board part 12 can be improved, and the local tilting phenomenon of the flexible part 30 is improved; on the other hand, the flexible member 30 has a larger covering area for the brush plate portion 12, so that the rigid portion of the brush plate portion 12, including the edge rigid portion where the back surface meets the peripheral surface, can be better isolated from the gum, the mouth, the tooth surface, and the like, thereby further improving the comfort of use.

In some embodiments, as shown in fig. 12 and 14, the flexible member 30 includes both the second flexible portion 33 and the third flexible portion 34, so as to form a better flexible barrier from the front side and the peripheral side of the brush plate portion 12, and to form a better and more comprehensive protection for the oral cavity, the gingival tooth surface, and the like.

Alternatively, when the flexible member 30 includes both the second flexible portion 33 and the third flexible portion 34, the third flexible portion 34 extends toward the peripheral side surface of the brush plate portion 12 to be connected to the second flexible portion 33. Therefore, on one hand, the connection stability of the flexible part 30 and the brush board part 12 can be improved, and the local tilting phenomenon of the flexible part 30 is improved; on the other hand, the flexible member 30 has a larger covering area for the brush plate portion 12, and can better isolate the rigid portion of the brush plate portion 12, including the rigid portion where the front surface and the peripheral surface meet, from the gum, the mouth, the tooth surface, and the like, to further improve the comfort of use.

In some embodiments, as shown in fig. 12 and 14, the flexible member 30 includes both the first flexible portion 31 and the third flexible portion 34, so that a better flexible barrier can be formed from the front side and the back side of the brush plate portion 12, resulting in better and more comprehensive protection for the oral cavity, the gingival tooth surface, and the like.

Optionally, the thickness of the third flexible portion 34 is less than the thickness of the first flexible portion 31. Specifically, on the premise of ensuring the overall strength of the electric toothbrush head 100, the brush head portion of the electric toothbrush head 100 needs to have a certain thickness, in order to ensure that the brush plate portion 12 has better elasticity, the thickness of the brush plate portion 12 cannot be too thick, therefore, the rest of the thickness of the brush head portion can be compensated by the flexible member 30, if the thickness of the third flexible portion 34 located on the front side is too thick and injection molding is adopted, the third flexible portion is affected by the bristles 20 during injection molding, the uniform injection molding is not easy, and the uniformity of the overall elasticity is affected, therefore, the first flexible portion 31 on the back side is relatively thicker, most of the rest of the thickness of the brush head portion is compensated, and the first flexible portion 31 relatively thicker can form better buffer protection from the back side of the brush plate portion 12.

Exemplarily, the thickness of third flexible portion 34 is no more than 1mm to can avoid the thickness of moulding plastics of third flexible portion 34 too big, lead to the flexible glue mobility poor of moulding plastics, and then lead to the injection structure inhomogeneous, influence the holistic elasticity homogeneity's of electric toothbrush head 100 technical problem.

Optionally, the thickness of the first flexible portion 31 is greater than 1/2 of the thickness of the brush plate portion 12. In other words, the thickness of the first flexible portion 31 is half or more of the thickness of the brush plate portion 12, and on the one hand, the thickness of the brush plate portion 12 can be ensured to be low, so as to ensure the elasticity of the brush plate portion 12; on the other hand, the first flexible portion 31 at the back side 12b can be used for effective elastic compensation and stably connected to the back side 12b of the brush plate portion 12, so as to improve the overall structural strength of the power toothbrush head 100.

In some embodiments, as shown in fig. 12 and 14, the flexible member 30 includes three of the first flexible portion 31, the second flexible portion 33 and the third flexible portion 34, so that a better flexible barrier can be formed from the front side, the back side and the peripheral side of the brush plate portion 12, and a better and more comprehensive protection can be formed for the oral cavity, the gingival tooth surface and the like.

Alternatively, as shown in fig. 15, when the flexible member 30 includes the first flexible portion 31, the second flexible portion 33, and the third flexible portion 34 at the same time, the flexible member 30 may be further configured to wrap the entire surface of the brush plate portion 12. That is, the outer side of the brush plate portion 12 is covered with the flexible member 30, the flexible member 30 is configured as a flexible sleeve having a contour substantially identical to that of the brush plate portion 12, and is injection-molded or sleeved on the brush plate portion 12, and a portion of the flexible member 30 located on the front side 12a of the brush plate portion 12 is opened with an avoiding hole a for the bristles 20 to pass through.

Therefore, on one hand, the connection between the flexible part 30 and the brush board part 12 can be improved to be more stable and reliable, and the local tilting phenomenon of the flexible part 30 can be better improved; on the other hand, the flexible member 30 covers the brush plate portion 12 in a larger area, so that the rigid portion of the brush plate portion 12, including the rigid portions such as the back surface, the peripheral surface, the front surface, and the edge of the junction between the adjacent surfaces, can be better isolated from the gum, the mouth, the tooth surface, and the like, thereby further improving the comfort of use.

In some embodiments, when flexible member 30 includes at least first flexible portion 31, as shown in fig. 15-18, groove portion 111 is formed on the back surface of brush rod portion 11, flexible member 30 further includes extension portion 32, and extension portion 32 fills groove portion 111 and is connected to first flexible portion 31, and groove portion 111 includes at least one flared portion with an increasing width in a direction from brush plate portion 12 to brush rod portion 11 to prevent extension portion 32 from separating from brush rod portion 11 when brush plate portion 12 is elastically deformed.

In other words, the brush rod portion 11 is provided with a groove portion 111 on the side on the same side as the back side 12b of the brush plate portion 12, the flexible member 30 has an extending portion 32 engaged with the groove portion 111, the groove portion 111 may include at least one flared portion (i.e., the width of the groove portion 111 gradually increases along the direction from the brush plate portion 12 to the brush rod portion 11), the flexible member 30 is provided with the extending portion 32 on the side toward the first end 11a of the brush rod portion 11 for being connected with the brush rod portion 11, and the extending portion 32 is configured to match with the groove portion 111 and fill the groove portion 111.

Like this, extension 32 and first flexible portion 31 can carry out the buffering of the reaction force of flank of tooth and to gum, the effective protection of oral cavity internal surface at dorsal side 12b of brush board portion 12 jointly, and simultaneously, when brush board portion 12 takes place to warp, carry on spacingly through the flaring section to extension 32, can avoid extension 32 to deviate from concave part 111 comparatively effectively to improve the cooperation stability of flexible piece 30 and brush head body 10, improve electric toothbrush head 100's life.

Further, when the groove portion 111 is inserted into the extending portion 32, the groove portion 111 may be in interference fit to better prevent the extending portion 32 from coming off the groove portion 111, so as to improve the stability of the flexible member 30 in cooperation with the toothbrush head body 10 and to improve the service life of the electric toothbrush head 100. Alternatively, the extended portion 32 may be injection molded in the groove portion 111, thereby simplifying the process and further improving the connection reliability.

In some alternative embodiments, first flexible portion 31 and extension portion 32 may be integrally formed, or, in other embodiments, first flexible portion 31 and extension portion 32 may be constructed as a single piece, first flexible portion 31 may be secured to back side 12b of brash section 12, extension portion 32 is secured partially to back side 12b of brash section 12, partially within grooved portion 111 or fully within grooved portion 111, and so forth.

In addition, in some embodiments, the flexible member 30 may be integrally formed as an injection-molded member and connected to the head body 10 by injection molding, so as to simplify the manufacturing process and improve the reliability of the combination of the two.

In some embodiments, the groove wall of the groove portion 111 may be configured as a curved surface, thereby facilitating the flow of the injection molding material within the groove portion 111 and improving the uniformity of injection molding.

Alternatively, the width of the groove portion 111 is gradually decreased and then gradually increased in the direction from the brush plate portion 12 to the brush bar portion 11. From this, can form to close up earlier, the form of flaring again to guarantee that the whole width of concave part 111 can be relatively even, the wide department is unlikely to too wide, and narrower department is unlikely to too narrow, thereby makes extension 32 and concave part 111 be connected more reliably, and the anticreep nature is better, is favorable to moulding plastics moreover more.

In some embodiments, the brush plate portion 12 is formed as a resilient brush plate that is bendable and twistable in itself. That is, the connecting line between the free end and the fixed end of the brush plate portion 12 can be bent, deflected, twisted, and the like, so that the brush plate portion can be better suitable for different tooth surface shapes, and the fitting cleaning effect can be improved. The brush face orientation of the brush 20 can be changed by twisting the brush plate portion 12, and when teeth are brushed by a scientific brushing method (babbit brushing method), teeth can be better brushed by twisting the brush plate portion 12, and the twist angle of the wrist can be reduced.

In some embodiments, as shown in fig. 3 and 4, at least a portion of the brush bar portion 11 has a dimension in the thickness direction of the brush bar portion 11 that is greater than the maximum thickness of the brush plate portion 12. This is advantageous in that the brush plate portion 12 is elastically deformable with respect to the brush rod portion 11. For example, the cross-sectional area of the brush bar portion 11 is gradually reduced toward the direction approaching the brush plate portion 12, so that the thickness of the brush plate portion 12 is reduced compared with the thickness of the brush bar portion 11, the elasticity of the brush plate portion 12 can be ensured, the deformation amplitude of the brush bar portion 11 in the process of being stressed is small in the process of brushing teeth, and the vibration of the motor can be more efficiently transmitted to the brush plate portion 12.

Alternatively, when the thickness of the region where the thickness of the brush shaft portion 11 is the smallest is also larger than the thickness of the brush plate portion 12, it is better to ensure that the brush plate portion 11 exerts elastic deformation, and the problem of hand shaking of the brush shaft portion 11 is better avoided.

Optionally, the cross-sectional area of the end of the brush plate portion 12 connected to the brush rod portion 11 is smaller than the cross-sectional area of the end of the brush rod portion 11 connected to the brush plate portion 12, so that the brush head body 10 forms a cross-sectional abrupt change between the brush plate portion 12 and the brush rod portion 11, that is, the brush plate portion 12 is configured to have a cross-sectional abrupt change at least in a region where the brush rod portion 11 is connected, so that the cross-sectional abrupt change is formed into an elastic connection region, through elastic deformation of the cross-sectional abrupt change, a deformable angle of the brush plate portion 12 relative to the brush rod portion 11 is not smaller than 10 °, and the cleaning effect of the electric toothbrush head 100 is effectively improved.

In some embodiments, portions of flexible member 30 are provided with abrupt cross-sectional changes to provide a smooth transition of the outer surface of powered toothbrush head 100 at the junction of the brush plate portion 12 and the brush bar portion 11, as shown in figures 10-13. Thus, on the one hand, the appearance of the electric toothbrush head 100 is smoother, the gripping comfort can be improved, the accumulation of dirt in the abrupt change of the cross section can be avoided, and the plot performance can be improved, and on the other hand, the connection stability of the brush plate part 12 and the brush rod part 11 can be improved.

In some embodiments, such as shown in FIG. 4, the brush plate portion 12 is integrally formed with the brush bar portion 11. From this, the processing of electric toothbrush head 100 is simpler, convenient, can improve machining efficiency, reduces the processing cost, and wherein, brush board portion 12 can adopt the thermoplastic elastomer material to make, can improve the elasticity of brush board portion 12.

In some embodiments, the material of the brush rod portion 11 is polystyrene (TPE material, thermoplastic elastomer). For example, when the brush bar portion 11 and the brush plate portion 12 are constructed as an integrally molded component, the brush bar portion 11 and the brush plate portion 12 may be constructed as an integrally molded component made of polystyrene, and when the brush plate portion 12 and the brush bar portion 11 are constructed as a separate component, at least the brush plate portion 12 is made of polystyrene. This ensures that the brush plate portion 12 has a high elastic deformability.

In some embodiments, such as shown in fig. 12 and 13, the brush plate portion 12 and the brush bar portion 11 are separate pieces, the head body 10 further includes a connecting portion 40, and the brush plate portion 12 and the brush bar portion 11 are connected by the connecting portion 40.

In other words, in the embodiment where the brush plate portion 12 is provided separately from the brush rod portion 11, the brush rod portion 11 is provided on the connecting portion 40, the connecting portion 40 is connected to the brush rod portion 11, the connecting portion 40 can be made elastic to improve the elasticity of the brush plate portion 12, the brush plate portion 12 is used to mount the brush bristles 20, and the brush plate portion 12 is provided separately from the brush rod portion 11, so that the assembly of the brush bristles 20 on the brush plate portion 12 is facilitated, and the assembly convenience of the electric toothbrush head 100 can be improved.

In some embodiments, referring to fig. 13, the connecting portion 40 is disposed on the back side 12b of the brush plate portion 12, the connecting portion 40 and the brush rod portion 11 are integrally formed, and a part of the flexible member 30 is disposed between the connecting portion 40 and the brush plate portion 12, and connects the connecting portion 40 and the brush plate portion 12.

Therefore, the connecting portion 40 is formed as a bracket connected to the first end 11a of the brush rod portion 11, for example, the bracket can be made to have elasticity by selecting materials to lift the brush plate portion 12 and elastically deform synchronously with the brush plate portion 12, the brush plate portion 12 is connected to the connecting portion 40 through the flexible member 30, the flexible member 30 at least partially covers the connecting portion 40, the combination area of the connecting portion 40 and the flexible member 30 is increased, the connection stability of the brush plate portion 12 and the connecting portion 40 is increased, and the elasticity of the brush plate portion 12 is effectively compensated.

In the embodiment where the brush bar portion 11 and the brush plate portion 12 are connected by the connecting portion 40, optionally, the connecting portion 40 is arranged between the brush bar portion 12 and the brush bar portion 11 along the length extension direction of the brush bar portion 11, and the elastic deformability of the connecting portion 40 is stronger than that of either one of the brush bar portion 12 and the brush bar portion 11.

Like this, in the process of brushing teeth, connecting portion 40 produces elastic deformation and drives the relative brush pole portion 11 of brush board portion 12 and move by a wide margin, and at connecting portion 40 and brush board portion 12 vibration in-process, brush pole portion 11 is nearly motionless to improve clean effect, and can avoid connecting portion 40 to cause the damage to the gum through the flexible piece 30 of cladding outside connecting portion 40.

Of course, the utility model is not limited thereto, for example, in other embodiments, the connecting portion 40 and the brush rod portion 11 may also be separate pieces and assembled, or the connecting portion 40 and the brush plate portion 12 may also be connected by other manners, such as bonding or other fixing manners, and the like, which will not be described herein.

As shown in fig. 4 to 7, according to some embodiments of the present invention, the brush plate portion 12 is formed with mounting holes b, and the root portions 21 of the bristles 20 are disposed in the mounting holes b, so that the root portions 21 of the bristles 20 can be restrained by the mounting holes b, thereby improving the coupling stability of the bristles 20 and the cleaning force of the bristles 20 to the tooth surface. For example, the bristles 20 are multiple, the multiple bristles 20 can be formed into several bristle tufts with the same or different geometric shapes, and each mounting hole b is correspondingly provided with one bristle tuft.

Alternatively, as shown in fig. 10 and 11, the front side surface of the brush plate portion 12 is formed with a plurality of annular protrusions 125, inner rings of the annular protrusions 125 form mounting holes b, the flexible member 30 includes a third flexible portion 34, an avoiding hole b avoiding the annular protrusion 125 is formed on the third flexible portion 34, and a thickness of the third flexible portion 34 is not greater than a height of the annular protrusion 125. From this, when third flexible portion 34 processed to brush board portion 12 through injection molding process on, can avoid the material of the in-process fluid state of moulding plastics to flow into the mounting hole b of brush hair 20 through the separation of annular bulge 125, avoid leading to brush hair 20 adhesion phenomenon to appear, also make things convenient for follow-up electric toothbrush head 100's washing, avoid hiding between the brush hair 20 dirty.

Optionally, the height of the annular protrusion 125 does not exceed 2 mm. Therefore, the limit of the deformation of the bristles 20 caused by the annular protrusion 125 can be reduced, so that the bristles 20 can better exert the deformation and the tooth surface cleaning effect can be improved.

Optionally, the annular protrusion 125 is soft, i.e., has some flexibility. Therefore, the limit of the deformation of the bristles 20 caused by the annular protrusion 125 can be reduced, so that the bristles 20 can better exert the deformation and the tooth surface cleaning effect can be improved.

In some embodiments, the mounting hole b is a through hole, the root portion 21 of the bristle 20 is thermally fused to the mounting hole b, and the flexible member 30 includes a first flexible portion 31, and the first flexible portion 31 covers the mounting hole b. Wherein, be located the first flexible portion 31 of brush board portion 12 dorsal part 12b and cover and mounting hole b to shelter from mounting hole b, guarantee electric toothbrush head 100's surface finish, the dorsal part 12b unevenness of brush board portion 12 after avoiding the assembly to finish leads to hiding dirty phenomenon, improves clean convenience, and can form the protection to the root 21 of brush hair 20, improves brush hair 20's connection reliability. In addition, the thermal melting connection mode is beneficial to fixing the bristles 20, and the processing convenience and the connection reliability are improved.

Alternatively, the brush staples 20 are formed on the back side 12b of the brush plate portion 12 with a heat-fusible connecting sheet extending to the outer peripheral region of the mounting hole b, and the first flexible portion 31 covers the heat-fusible connecting sheet. It can be understood that the bristles 20 are inserted into the mounting holes b, and the hot-melt connecting pieces are melted and then solidified with the bristles 20 to fix the roots 21 of the bristles 20 on the brush plate portion 12, and the first flexible portions 31 are covered outside the hot-melt connecting pieces, so that the specified stability of the bristles 20 on the brush plate portion 12 can be improved, and the unevenness of the outer surface of the electric toothbrush head 100 caused by the hot-melt process can be avoided to improve the cleaning convenience.

Alternatively, as shown in fig. 15 to 18, the back side 12b of the brush plate portion 12 is formed with an annular rib 121 extending along the edge, the heat-fusible connecting sheet is provided in an inner ring area of the annular rib 121, the thickness of the heat-fusible connecting sheet is equal to or less than the height of the annular rib 121, and the first flexible portion 31 covers the inner ring area of the annular rib 121 and extends to an outer ring area of the annular rib 121. That is to say, the periphery of brush board portion 12 is provided with annular protruding rib 121, the recess (being the inner ring region) is injectd to the inside of annular protruding rib 121, the hot melt connection piece sets up in the recess, the remaining part in the recess is filled by first flexible portion 31, the part outside the recess also covers by first flexible portion 31, the height of hot melt connection piece is not higher than the height of annular protruding rib 121, therefore, make first flexible portion 31 thickness can be bigger, thereby make brush board portion 12 can better drip and exert elastic deformation, and improve the stability of being connected of flexible 30 and brush board portion 12.

As shown in fig. 6 to 7, the brush plate portion 12 has a pre-heat-melting state in which the back surface of the brush plate portion 12 has the heat-melting structure 122 located around the mounting hole b, and a post-heat-melting state in which the heat-melting connecting piece and the heat-melting structure 122 are welded together, the heat-melting structure 122 includes a chamfered surface and/or a heat-melting post, the chamfered surface extends obliquely in a radial direction of the mounting hole b in a direction away from the mounting hole b toward a direction close to the brush plate portion 12.

Specifically, the chamfer of the opening of the mounting hole b forms a chamfer surface, and the form of the hot-melt connecting piece formed after the bristles 20 are hot-melted has a certain guiding structure, which is beneficial to guiding the bristles 20 to be hot-melt connected piece with the cross section area larger than that of the mounting hole b. The periphery interval of the mounting hole b of brush board portion 12 is provided with a plurality of hot melt posts, and the hot melt post is as an organic whole with the butt fusion when brush hair 20 is heated, has promoted the connection effect of brush hair 20 and brush board portion 12. From this, through the setting of chamfer face and/or hot melt post, make the hot melt processing back, the brush hair 20 is more stable with the fixed of brush board portion 12, avoids electric toothbrush head 100 in-process, and the phenomenon that drops appears in brush hair 20, improves and uses experience.

Of course, the present invention is not limited thereto, and the brush 20 may not be directly connected to the mounting holes b, for example, in some other embodiments, as shown in fig. 11, a mounting tube 50 is disposed in at least one mounting hole b, the root 21 of the brush 20 is connected to the mounting tube 50, and the mounting tube 50 is an elastic tube and is elastically deformed in synchronization with the brush plate portion 12. Thus, by providing the mounting pipe 50, the brush 20 can be mounted, the connection stability between the brush 20 and the plate portion 12 can be improved, and the mounting pipe 50 is an elastic pipe and elastically deforms in synchronization with the plate portion 12, so that the plate portion 12 can smoothly exhibit elastic deformation, and the problem that the elastic deformation of the plate portion 12 is hindered by the provision of the mounting pipe 50 can be improved.

It should be noted that the mounting tube 50 may be completely embedded in the corresponding mounting hole b, or may have a portion exposed outside the mounting hole b, which is not limited herein.

In addition, the present invention also provides an electric toothbrush, according to an embodiment of the present invention, comprising: a handle and a head assembly, the head assembly being the powered toothbrush head 100 of any of the embodiments described above.

According to the electric toothbrush provided by the embodiment of the utility model, by adopting the brush head assembly, the brush holder vibrates to drive the brush plate part 12 of the brush head assembly to swing relative to the brush holder, the amplitude angle of the brush plate part 12 is larger, the cleaning effect can be improved, the elastic brush plate part 12 and the flexible part 30 can buffer the reaction force of the tooth surface, the hand shaking phenomenon is avoided, the use experience is improved, the gum is prevented from being damaged, and the use safety is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more.

In the description of the utility model, "on" or "under" a first feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but are in contact via another feature between them.

In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (24)

1. An electric toothbrush head, comprising:

the toothbrush head comprises a toothbrush head body, the toothbrush head body comprises a toothbrush rod part and a toothbrush plate part, the toothbrush rod part comprises a first end and a second end which are opposite in the length direction, the brush plate part is connected with the first end of the brush rod part, the two sides of the thickness of the brush plate part are respectively a front side and a back side, the brush plate portion is elastically deformable between a natural state and an elastically deformed state with respect to the brush rod portion, and the deformable angle of the brush plate part relative to the brush rod part is not less than 10 degrees, the elastic deformation state comprises a first deformation state and a second deformation state, the brush plate portion is bent and deformed toward the front side with respect to the brush shaft portion in the first deformed state, the brush plate portion is bent and deformed toward the back side with respect to the brush shaft portion in the second deformed state, the second end of the brush rod part is suitable for being connected with a brush handle of the electric toothbrush, and the brush rod part transmits the vibration generated by the brush handle of the electric toothbrush to the brush board part;

the two ends of the length of each bristle are respectively a root part and a head part, the root parts of the bristles are directly or indirectly connected with the brush board part, and the head parts of the bristles extend out from the front side of the brush board part;

a flexible member, the hardness of which is smaller than the hardness of the brush plate portion, and the flexible member includes at least one of a first flexible portion provided on a back side of the brush plate portion, a second flexible portion provided on a peripheral side of the brush plate portion, and a third flexible portion provided on a front side of the brush plate portion.

2. The powered toothbrush head of claim 1,

the flexible piece comprises the first flexible part and a second flexible part at the same time, and the thickness of the second flexible part is smaller than that of the first flexible part; and/or the presence of a gas in the gas,

the flexible piece comprises the first flexible portion and a third flexible portion, and the thickness of the third flexible portion is smaller than that of the first flexible portion.

3. The powered toothbrush head of claim 1 wherein the first flexible portion has a thickness greater than 1/2 of the thickness of the brush plate portion.

4. The powered toothbrush head of claim 1,

the flexible piece comprises the first flexible part and the second flexible part, and the first flexible part extends to the peripheral side surface of the brush board part and is connected with the second flexible part; and/or the presence of a gas in the gas,

the flexible member includes the third flexible portion and the second flexible portion, and the third flexible portion extends to the circumferential side surface of the brush plate portion and is connected to the second flexible portion.

5. The powered toothbrush head of claim 4 wherein the flexible member includes all of the first flexible portion, the second flexible portion, and the third flexible portion and completely encases the brush plate portion except for the avoidance of the bristles.

6. The powered toothbrush head of claim 1 wherein the flexible member includes the first flexible portion and the stem portion is formed with a recessed portion at a rear surface thereof, the flexible member further including an extension portion filled in the recessed portion and connected to the first flexible portion, the recessed portion including at least one flared section of increasing width in a direction from the brush plate portion to the stem portion to hinder separation of the extension portion from the stem portion upon elastic deformation of the brush plate portion.

7. The powered toothbrush head of claim 6, wherein the width of the groove portion gradually decreases and then gradually increases in a direction from the brush plate portion to the brush shaft portion.

8. The powered toothbrush head of claim 1, wherein the brush plate portion is formed as a resilient brush plate that is itself bendable and twistable.

9. An electrically powered toothbrush head according to claim 1 wherein at least part of the shaft portion has a dimension in the direction of the thickness of the shaft portion which is greater than the maximum thickness of the blade portion.

10. The powered toothbrush head of claim 1 wherein the cross-sectional area of the end of the blade portion that connects to the shaft portion is less than the cross-sectional area of the end of the shaft portion that connects to the blade portion so that the head body defines a sudden change in cross-section between the blade portion and the shaft portion.

11. The powered toothbrush head of claim 10 wherein portions of the flexible member are located at the abrupt changes in cross-section to provide a smooth transition of the outer surface of the powered toothbrush head at the junction of the blade portion and the shaft portion.

12. The powered toothbrush head of claim 1, wherein the entire portion of the brush plate and the shaft portion are integrally formed, and/or the material of the brush plate portion is polystyrene.

13. The powered toothbrush head of claim 1, wherein the blade portion and the shaft portion are separate pieces, the body further including a connecting portion through which the blade portion and the shaft portion are connected.

14. The powered toothbrush head of claim 13 wherein the connecting portion is located on the back side of the brush portion, and the connecting portion and the shaft portion are integrally formed, and a portion of the flexible member is located between and connects the connecting portion and the brush portion.

15. The powered toothbrush head of claim 13, wherein the connecting portion is disposed between and connects the brush plate portion and the brush shaft portion along a length extension direction of the brush shaft portion, and an elastic deformability of the connecting portion is greater than an elastic deformability of either of the brush plate portion and the brush shaft portion.

16. An electrically powered toothbrush head according to any one of claims 1 to 15 characterised in that the plate portion is formed with a mounting aperture in which the root portions of the bristles are located.

17. The powered toothbrush head of claim 16 wherein the front surface of the brush plate portion is formed with a plurality of annular protrusions, the inner ring of which forms the mounting hole, the flexible member including the third flexible portion, the third flexible portion having an avoidance hole formed therein to avoid the annular protrusions, the third flexible portion having a thickness not greater than the height of the annular protrusions.

18. The powered toothbrush head of claim 17 wherein the height of the annular protrusion is no more than 2 mm; and/or the annular bulge is soft.

19. The powered toothbrush head of claim 16 wherein the mounting hole is a through hole, the root portion of the bristle being thermally fused to the mounting hole, the flexible member including the first flexible portion, the first flexible portion covering the mounting hole.

20. The powered toothbrush head of claim 19 wherein the bristles form a heat staked tab on a back side of the brush portion, the heat staked tab extending to a peripheral region of the mounting aperture, the first flexible portion covering the heat staked tab.

21. The powered toothbrush head of claim 20 wherein the back side of the brush plate portion is formed with an annular bead extending along an edge of the brush plate portion, the heat-fusible web is provided in an inner annular region of the annular bead, and the heat-fusible web has a thickness less than or equal to a height of the annular bead, and the first flexible portion covers the inner annular region of the annular bead and extends to an outer annular region of the annular bead.

22. The electric toothbrush head according to claim 20, wherein the brush plate portion has a pre-heat-melting state in which the back surface of the brush plate portion has a heat-melting structure located around the mounting hole, and a post-heat-melting state in which the heat-melting connecting piece is welded integrally with the heat-melting structure, the heat-melting structure including a chamfered surface and/or a heat-melting post, the chamfered surface extending obliquely in a radial direction of the mounting hole in a direction away from the mounting hole toward a direction close to the brush plate portion.

23. The powered toothbrush head of claim 16 wherein at least one of the mounting holes has a mounting tube, the root portion of the bristles being connected to the mounting tube, the mounting tube being an elastomeric tube and being resiliently deformable in synchronism with the brush plate portion.

24. An electric toothbrush, comprising:

a brush handle; and

a brush head assembly which is an electrically powered toothbrush head according to any one of claims 1 to 23.

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