CN218737711U - Toothbrush head and toothbrush - Google Patents

Abstract

The embodiment of the application discloses toothbrush head and toothbrush, the toothbrush head includes brush board and brush hair, and the brush hair includes that the first brush silk group, second brush silk group and the third brush silk group that distribute in proper order in the first direction and have a height, the brush silk of first brush silk group, second brush silk group and third brush silk group all with the brush board is fixed and all upwards stretches out in the second direction the brush board, on the first direction, the height of first brush silk group becomes gradually, and the height of second brush silk group step-down gradually, the height of third brush silk group becomes gradually, and the brush face of second brush silk group and the brush face of third brush silk group form concave curved surface, the second brush face with the part that first brush face links up mutually forms the convex curved surface that upwards arches with first brush face. The part of the highest height position of the convex curved surface of the toothbrush head is relatively gentle, so that the part can not only extend into the gap between the teeth to be cleaned, but also is not easy to stab the teeth.

Description

Toothbrush head and toothbrush

Technical Field

The utility model relates to an oral cavity cleaning appliance field, concretely relates to toothbrush head and toothbrush.

Background

In the related art, a toothbrush includes a head including a brush plate and bristles, root portions of which are implanted and fixed to the brush plate. When brushing teeth, the toothbrush head stretches into the oral cavity, and partial bristles contact with teeth, in order to satisfy the requirement of brushing the slit between the teeth, partial bristles are set to have sharp portion, when the sharp portion stretches into the slit between the teeth, other bristles are relatively poor with the laminating degree of tooth flank of teeth, only less part of bristles are laminated with tooth flank of teeth, the friction frequency between the bristles that do not laminate well with tooth flank of teeth and the flank of teeth is little, cause the cleaning effect of brushing teeth relatively poor to the tooth flank. In addition, since the interdental space is cleaned by the sharp portion, the sharp angle of the sharp portion is small, and the gum is stabbed by the contact of the sharp portion with the gum during tooth brushing, which causes a severe pain. Therefore, there is a need for a new toothbrush head and toothbrush.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a toothbrush head and a toothbrush, which can reduce or avoid tooth stabbing during tooth brushing.

In a first aspect, the present embodiment provides a toothbrush head comprising,

brushing the board; and a process for the preparation of a coating,

the brush bristles comprise a first brush filament group, a second brush filament group and a third brush filament group which are distributed in sequence in a first direction and have heights, the brush filaments of the first brush filament group, the second brush filament group and the third brush filament group are all fixed with the brush plate and all extend out of the brush plate in a second direction, the heights of the first brush filament group, the second brush filament group and the third brush filament group are the lengths of the brush filaments extending out of the brush plate in the second direction, the tips of the brush filaments of the first brush filament group define a first brush surface, the tips of the brush filaments of the second brush filament group define a second brush surface, the tips of the brush filaments of the third brush filament group define a third brush surface, the heights of the first brush filament group gradually increase in the first direction, the heights of the second brush filament group gradually decrease in the second direction, the heights of the third brush filament group gradually increase in the third direction, the second brush surface and the third brush surface form a concave curved surface, and the convex curved surface of the second brush filament group is far away from the first brush plate.

In some embodiments, the third group of brush filaments has a highest height that is less than a highest height of the first group of brush filaments.

In some embodiments, the first group of filaments has a length A in the first direction, the bristles have a length B in the first direction, and 1/10 ≦ A: B ≦ 1/3.

In some embodiments, the first set of brush filaments has a rate of height change that is less than a rate of height change of the second set of brush filaments in the first direction.

In some embodiments, the length of the first group of filaments in the first direction is less than the length of the second group of filaments in the first direction, the second group of filaments comprising a first segment and a second segment, the first segment being engaged with the first group of filaments and the second segment being engaged with the third group of filaments in the first direction; in the first direction, a rate of height change of the first segment is greater than a rate of height change of the first group of brush filaments, and the rate of height change of the first group of brush filaments is greater than a rate of height change of the second segment.

In some embodiments, the sum of the areas of the orthographic projections of the first group of filaments and the first segment on the brush plate is smaller than the sum of the areas of the orthographic projections of the second segment and the third group of filaments on the brush plate.

In some embodiments, the length of the first group of brush filaments in the first direction is 2mm to 6mm.

In some embodiments, the difference between the highest height and the lowest height of the first group of brush filaments is 1mm to 3.5mm.

In some embodiments, the difference between the highest height and the lowest height of the third group of brush filaments is 0.5mm to 2.5mm.

In some embodiments, a height difference between the highest height of the first group of brush filaments and the highest height of the third group of brush filaments is 0.5mm to 1.8mm, and the highest height of the first group of brush filaments is greater than the highest height of the third group of brush filaments.

In some embodiments, a height difference between a highest height of the first group of brush filaments and a lowest height of the third group of brush filaments is 1.5mm to 2.5mm.

In some embodiments, a maximum width of the first group of filaments in a third direction that is perpendicular to both the first and second directions is less than a maximum width of the second group of filaments in the third direction.

In some embodiments, a portion of the filaments of the third filament group are disposed obliquely with respect to the brush plate.

In some embodiments, the first group of filaments comprises a plurality of first filament tufts, the second group of filaments comprises a plurality of second filament tufts, and the third group of filaments comprises a plurality of third filament tufts, all of the first filament tufts and a portion of the second filament tufts enclosing a ring forming a first bristle ring, and a portion of the third filament tufts enclosing a ring forming a second bristle ring.

In some embodiments, the sum of the areas of the orthographic projections of the first bristle tufts, which enclose the first bristle rings, on the brush plate is S1, the sum of the areas of the orthographic projections of the second bristle tufts, which enclose the first bristle rings, on the brush plate is S2, and S1 is greater than S2.

In some embodiments, the bristles further comprise a first intermediate filament tuft, around which the first bristle ring surrounds, and a second intermediate filament tuft, around which the second bristle ring surrounds.

In some embodiments, the number of filaments of the first filament tuft is less than the number of filaments of the third filament tuft, and the density of the first filament tufts of the first filament group is greater than the density of the third filament tufts of the third filament group.

In some embodiments, for a tuft of brush filaments adjacent to the periphery of the brush plate, the height of the brush filaments on the outer side is lower than the height of the brush filaments on the inner side.

A toothbrush comprises the toothbrush head.

Has the advantages that: the height of the first brush silk group gradually becomes high along the first direction, the height of the second brush silk group gradually becomes low along the first direction, the height of the third brush silk group gradually becomes high along the first direction, the second brush surface and the third brush surface form a concave curved surface, the part of the second brush surface, which is connected with the first brush surface, and the first brush surface form an upward arched convex curved surface, so that the part of the highest height of the convex curved surface is relatively gentle, and the part can extend into the slits between the teeth and is not easy to stab the teeth.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Figure 1 is an exploded perspective view of a toothbrush head of an embodiment of the present application;

figures 2 and 3 are perspective views from two different perspectives of a toothbrush head according to an embodiment of the present invention;

figures 4 to 6 are front, left and right side views respectively of a toothbrush head of an embodiment of this application.

Description of the reference numerals:

1. brushing the board; 11. a first region; 111. a first groove; 12. a second region; 121. a second groove; 13. a third region; 131. a third groove; 14. an upper surface;

2. brushing; 21. a first group of brush filaments; 211. a first brush face; 212. a first tuft of brush filaments; 22. a second group of brush filaments; 22a, a first segment; 22b, a second segment; 221. a second brush face; 222. a second tuft of brush filaments; 222a, a second inner bristle tuft; 222b, a second outer brush filament tuft; 23. a third brush wire group; 231. a third brush face; 232. a third tuft of brush filaments; 24. a concave curved surface; 25. a convex curved surface; 251. a sharp portion; 26. a first intermediate tuft of bristles; 27. a second intermediate tuft of bristles;

3. a brush bar; 31. a proximal end; 32. a distal end;

100. a toothbrush head.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

As shown in fig. 1 to 6, a toothbrush head 100 is applied to a toothbrush. The toothbrush head 100 comprises a brush board 1 and bristles 2, wherein the brush board 1 can carry the bristles 2, the bristles 2 can clean teeth, and when teeth are brushed, the brush board 1 and the bristles 2 form a head part of the toothbrush head 100 which extends into an oral cavity. The brush hairs 2 are fixed on the brush plate 1, and the brush plate 1 comprises a first brush hair group 21, a second brush hair group 22 and a third brush hair group 23 which are sequentially distributed along a first direction X, correspondingly, the brush plate 1 comprises a first area 11, a second area 12 and a third area 13 which are sequentially distributed along the first direction X, the first brush hair group 21 is arranged on the first area 11, the second brush hair group 22 is arranged on the second area 12, and the third brush hair group 23 is arranged on the third area 13.

The first group of brush filaments 21 is composed of a plurality of brush filaments (not shown), the root of each brush filament is fixed in the first region 11, each brush filament extends upwards out of the brush plate 1 along the second direction Z, the length of each brush filament extending upwards out of the brush plate 1 is the height of the brush filament, and the height of the first group of brush filaments 21 is defined by the height of the brush filament. The tips of the individual filaments of the first filament group 21 define a first brush face 211.

The second group 22 of brush filaments is composed of a plurality of brush filaments, the root of each brush filament is fixed in the second area 12, each brush filament extends upwards out of the brush plate 1 along the second direction Z, the length of each brush filament extending upwards out of the brush plate 1 is the height of the brush filament, and the height of the second group 22 of brush filaments is defined by the height of the brush filament. The tips of the individual filaments of the second filament group 22 define a second brush face 221.

The third filament group 23 is composed of a plurality of filaments, roots of the filaments are fixed in the third region 13, the filaments extend upward from the brush plate 1 along the second direction Z, a length of the filament extending upward from the brush plate 1 is a height of the filament, and the height of the filament of the third filament group 23 is defined by the height of the filament. The tips of the individual filaments of the third filament group 23 define a third brush face 231.

In the first direction X, the first filament group 21 gradually increases in height, the second filament group 22 gradually decreases in height, the third filament group 23 gradually increases in height, and the second brush surface 221 and the third brush surface 231 form a concave curved surface 24. The part of the second brush surface 221, which is connected with the first brush surface 211, forms a convex curved surface 25 which is arched away from the brush plate 1 with the first brush surface 211, the highest height of the convex curved surface 25 is a sharp part 251, the sharp part 251 can extend into the tooth gap, and the sharp part 251 is formed at the connection part where the first brush wire group 21 and the second brush wire group 22 are connected.

Each filament group of the brush hairs 2 has a length in a first direction X, a height in a second direction Z and a width in a third direction Y, and the first direction X, the second direction Z and the third direction Y are mutually perpendicular in pairs. The height of each filament group of the brush staples 2 may be the length of the filament group extending upwards from the brush plate 1 in the second direction Z, which corresponds to the distance between the tip of the filament and the brush plate 1 in the second direction Z, and also corresponds to the distance between the brush surface and the brush plate 1 in the second direction.

Since the height of the first filament group 21 gradually increases along the first direction X, the height of the second filament group 22 gradually decreases along the first direction X, and the height of the third filament group 23 gradually increases along the first direction X, a sharp portion 251 is formed at the junction of the first brush surface 211 and the second brush surface 221, and the sharp portion 251 is suitable for extending into the tooth space between the adjacent teeth; because the second brush surface 221 and the third brush surface 231 form a concave curved surface 24, the part of the second brush surface 221, which is connected with the first brush surface 211, and the first brush surface 211 form a convex curved surface 25 containing the sharp part 251, the sharp part 251 can extend into the slit between the teeth and is relatively gentle, and the teeth are not easy to stab. Meanwhile, when brushing teeth, the first bristle group 21 having a higher height is easily deformed due to the deformability of the bristles 2, and if there is no support for the first bristle group 21, the first bristle group is easily permanently deformed, and a portion of the first bristle group 21 having a lower height serves as a support to prevent the first bristle group from being permanently deformed; on the other hand, during brushing, the first filament group 21 can contact the tooth surface on the inner side of the interdental space, and the second filament group 22 and the third filament group 23 can contact the tooth surface on the outer side of the interdental space, so that the brush bristles 2 can be effectively contacted with the tooth surface while being inserted into the interdental space to clean the interdental space regardless of the posture of the user.

In some embodiments, head 100 includes a shaft 3, the shaft 3 extending in a first direction X and having a proximal end 31 and a distal end 32, the proximal end 31 being secured to the plate 1, the distal end 32 being configured to be held by a user or assembled with other parts of the toothbrush, the proximal end 31 and the distal end 32 being located at opposite ends of the shaft 3 in the first direction X. The proximal end 31 of the brush bar 3 is adjacent the third filament group 23 of bristles 2. The brush rod 3 and the brush plate 1 are fixedly connected, and the connection mode can be but not limited to clamping, bonding, hot-melt welding, threaded connection or integral forming and the like.

In some embodiments, the first group of filaments 21 comprises a plurality of first filament tufts 212, each first filament tuft 212 being formed by a plurality of filaments arranged in a bundle, each first filament tuft 212 being distributed in a spot-like manner in the first region 11 of the brush plate 1. The second filament group 22 includes a plurality of second filament clusters 222, each second filament cluster 222 is formed by bundling a plurality of filaments, and each second filament cluster 222 is distributed in the second region 12 of the brush plate 1 in a dotted manner. The third filament group 23 includes a plurality of third filament clusters 232, each third filament cluster 232 is formed by bundling a plurality of filaments, and each third filament cluster 232 is distributed in the third area 13 of the brush plate 1 in a dotted manner. The shape of the cross-section of each tuft parallel to the brush plate 1 can be, but is not limited to, circular, oval or polygonal, etc., and the cross-section can be designed and manufactured according to the requirements. The cross section of each brush filament cluster of each brush filament group can be the same or different. For each brush wire group, each brush wire cluster can be distributed in a curve, a straight line, an array or other distribution modes meeting the design and manufacturing requirements.

In one particular construction, each of the first tufts 211 is arcuately disposed. The second filament bundle 222 includes a plurality of second inner filament bundles 222a located at the inner side, which is a side away from the brush bar 3, and a plurality of second outer filament bundles 222b located at the outer side, which is a side close to the brush bar 3, wherein each of the second inner filament bundles 221 is distributed in an arc shape, and each of the second outer filament bundles 221 is also distributed in an arc shape. The third bristle tufts 232 are distributed on the brush plate 1 in a dotted manner.

The first region 11 of the brush plate 1 is provided with first grooves 111 corresponding to the first bristle tufts 212 one by one, and the roots of the respective bristles are implanted and fixed in the first grooves 111. The second region 12 of the brush plate 1 is provided with second grooves 121 corresponding to the second filament clusters 222 one by one, and the roots of the filaments are implanted and fixed in the second grooves 121. The third area 13 of the brush plate 1 is provided with third grooves 131 corresponding to the third bristle tufts 232 one by one, and the roots of the respective bristles are implanted and fixed in the third grooves 131. Of course, in alternative arrangements, a single recess in the brush plate 1 could be used to implant a plurality of tufts of brush filaments.

The brush plate 1 may have an upper surface 14 facing the bristles 2, and the first, second, and third grooves 111, 121, and 131 are formed in the upper surface 14. The height of the group of filaments is the length of the filaments which project upwardly in the second direction Z above the upper surface 14.

In some embodiments, the height of the third filament group 23 is less than the height of the first filament group 21, so that the filaments of the third filament group 23 are shorter than the filaments of the first filament group 21, and the sharp portions 251 are not prevented from extending into the crevices due to the contact between the third filament group 23 and the teeth. In addition, especially for the third bristle group 23, the bristles with the highest height are shorter than those of the first bristle group 21, so that the sharp part 251 cannot be prevented from extending into the interdental space due to the contact of the bristles with the teeth with the higher height of the third bristle group 23 in certain postures, and the influence on the tooth brushing effect due to the small contact area between the bristles 2 and the teeth can be avoided.

In some embodiments, the first filament group 21 has a length A in the first direction, the bristles 2 have a length B in the first direction as a whole, and 1/10 ≦ A: B ≦ 1/3. Through the arrangement, the first brush silk group 21 has more support, and the permanent deformation of the brush silk with higher height of the first brush silk group 21 is prevented. When a user starts to brush teeth, the brush wires of the first brush wire group 21 are in contact with the tooth surface of the user, so that the user is easy to touch gums carelessly, the first brush surface 211 of the first brush wire group 21 has a certain area, the contact area of the first brush surface 211 and the gums is large, pressure is dispersed, and pain of stabbing the gums can be reduced. For A: B ≦ 1/3, on one hand, a longer distance is provided for arranging the second bristle group 22 and the third bristle group 23 because the second bristle group 22 and the third bristle group 23 are the main parts of the toothbrush head 100 and require more bristles, and on the other hand, a longer length dimension allows the heights of the second bristle group 22 and the third bristle group 23 to change more smoothly, so that the bristles of the second bristle group 22 and the third bristle group 23 can smoothly contact with the tooth surface. The ratio A to B is more than or equal to 1/10, so that the phenomenon that the toothbrush head is too large and generates punch-in feeling to the oral cavity is avoided.

In some embodiments, in the first direction X, the rate of change of the height of the first group of brush filaments 21 is less than the rate of change of the height of the second group of brush filaments 22. The first filament group 21 contacts the inner teeth, the second filament group 22 contacts the outer teeth, and the sharp part 251 extends into the interdental space, while the part of the teeth close to the outer side has a larger curvature change, so that the teeth and the interdental space can be adapted to the shape of the teeth, the teeth can be more closely fitted, and the brushing is more comprehensive.

In some embodiments, the length of the first filament group 21 in the first direction X is smaller than the length of the second filament group 22 in the first direction X, and the second filament group 22 includes a first segment 22a and a second segment 22b, in the first direction X, the first segment 22a is engaged with the first filament group 21, and the second segment 22b is engaged with the third filament group 23; in the first direction X, the height change rate of the first segment 22a is greater than the height change rate of the first brush filament group 21, and the height change rate of the first brush filament group 21 is greater than the height change rate of the second segment 22 b. Through the arrangement, the sharp corner of the sharp part 251 formed at the joint of the first brush wire group 21 and the second brush wire group 22 is small, the height change of the first brush wire group 21 is smooth, a user cannot feel sharp and stabbing easily, and the sharp part 251 can be ensured to stretch into the tooth gap for cleaning. The second group 23 of brush filaments is relatively gentle for better contact with the teeth, and its length in the first direction X cannot be too short.

In some embodiments, the sum of the areas of the orthographic projections of the first group of filaments 21 and the first segment 22a on the brush plate 1 is smaller than the sum of the areas of the orthographic projections of the second segment 22b and the third group of filaments 23 on the brush plate 1. Since the second and third wire groups 22 and 23 are main brushing parts, the main brushing part has a large area by setting the above-mentioned area relationship. In general, an orthographic projection on the brush plate 1 corresponds to an orthographic projection on the upper surface 14 of the brush plate 1.

In some embodiments, the length of the first filament group 21 in the first direction X is 2mm to 6mm. When the length is less than 2mm, the first brush wire group 21 is poor in supporting effect during tooth brushing, and the brush wires with higher height are easy to generate permanent deformation; when the length is more than 6mm, the rate of change in height of the first filament group 21 is too small to easily form the sharp portion 251, i.e., the contact of the first filament group 21 with the tooth surface affects the protrusion of the bristles 2 having a high height into the crevices.

In some embodiments, the difference between the highest height and the lowest height of the first filament group 21 is 1mm to 3.5mm. The highest elevation position may be a position engaged with the second group of brush filaments 22, and the lowest elevation position may be a position farthest from the second group of brush filaments 22. Through the arrangement, the height change of the first brush wire group 21 is relatively smooth, the contact area of the first brush wire group and the tooth surface is large, the cleaning efficiency is high, and the sharp stabbing pain feeling is not easy to generate even if the first brush wire group is in contact with the gum. When the height difference is less than 1mm, the sharp part 251 is too gentle and inconvenient for cleaning tooth gaps; when the height difference is greater than 3.5mm, the height change of the first brushing teeth group 21 is relatively severe, and the sharp portion 251 is too sharp to easily stab teeth.

In some embodiments, the difference in height between the highest height and the lowest height of the third group of filaments 23 is 0.5mm to 2.5mm. Through the arrangement, the height change of the bristles of the third brush wire group 23 is gentle, the third brush wire group is adaptive to the shapes of teeth, the contact area of the third brush wire group and the teeth is larger, and the tooth brushing effect is improved. When the height difference is less than 0.5mm or more than 2.5mm, the contact area with the teeth is affected by making the height change of the third bristle group 23 too gentle or too violent.

In some embodiments, the height difference between the highest height of the first group of brush filaments 21 and the highest height of the third group of brush filaments 23 is 0.5mm to 1.8mm, and the highest height of the first group of brush filaments 21 is greater than the highest height of the third group of brush filaments 23. With the above arrangement, the change in the heights of the brush wires of the second brush wire group 22 and the third brush wire group 23 is gentle, so that the concave curved surface 24 formed by the second brush surface 221 and the third brush surface 231 can be more favorably adapted to the shape of the teeth, and the contact area with the tooth surface of the teeth can be further increased. When the height difference is less than 0.5mm or more than 1.8mm, the height of the second and third filament groups 22 and 23 is changed too gradually or too strongly, which affects the contact area with the teeth.

In some embodiments, the difference between the highest height of the first filament group 21 and the lowest height of the third filament group 23 is 1.5mm to 2.5mm. Through the arrangement, the second brush wire group 22 and the third brush wire group 23 are gently changed to adapt to the shape of teeth, so that the condition that part of bristles cannot contact with the teeth during tooth brushing is avoided, and the tooth brushing effect is improved. When the height difference is less than 1.5mm or more than 2.5mm, the height of the second and third filament groups 22 and 23 is changed too gradually or too strongly, which affects the contact area with the teeth.

In some embodiments, the maximum width of the first filament group 21 in the third direction Y is smaller than the maximum width of the second filament group 22 in the third direction Y, which is perpendicular to both the first direction X and the second direction Z. With the above arrangement, the head of the toothbrush head 100 can be arranged to be small, the head of the toothbrush head 100 needs to be inserted between teeth and facial muscles, and the larger head can cause a user to feel hurry.

In some embodiments, a portion of the filaments of the third filament group 23 are arranged obliquely with respect to the brush plate 1. Through the arrangement, the toothbrush head can adapt to each holding posture of a user, and the contact area between the brush wires of the third brush wire group 23 and the teeth of the user can be increased, so that the integral cleaning capacity of the toothbrush head is improved.

In one embodiment, all of the first bristle tufts 212 and a portion of the second bristle tufts 222 form a loop to form a first bristle ring, and a portion of the third bristle tufts 222 form a loop to form a second bristle ring. When a user brushes teeth, different holding postures can be used, the contact between the bristles 2 and the teeth can be influenced by the distribution of the bristles 2, and the plurality of bristle tufts are arranged into the ring shape, so that the bristles 2 can effectively brush and clean the teeth no matter what holding posture the user uses. For the first bristle ring, it may consist of all of the first bristle tufts 212 and the second inner bristle tuft 222 a. The second outer bristle tuft 222b is positioned between the first bristle ring and the second bristle ring.

The area sum of the orthographic projections of the first bristle tufts 212 on the brush plate 1, which enclose the first bristle ring, is S1, the area sum of the orthographic projections of the second bristle tufts 222 on the brush plate 1, which enclose the first bristle ring, is S2, and S1 is greater than S2, as shown in fig. 4, i.e., the area sum of the orthographic projections of the second inner bristle tufts 222a on the brush plate 1 is smaller than S1.

The bristle 2 further comprises a first intermediate tuft 26, around which the first bristle ring surrounds, and a second intermediate tuft 27, around which the second bristle ring surrounds 27. Through the arrangement, the space of the brush plate 1 can be fully utilized, so that the brush filament clusters on the brush plate 1 are distributed more uniformly, and the tooth brushing effect is improved.

The number of the brush filaments of the first brush filament bundle 212 may be smaller than the number of the brush filaments of the third brush filament bundle 232, and the density of the first brush filament bundle 212 of the first brush filament group 21 is greater than the density of the third brush filament bundle 232 of the third brush filament group 23. The higher density of the tufts of the first group 21 is to provide better support against permanent deformation of the filaments adapted to extend into the crevices. The density of the bristle tufts of the third bristle group 23 is low, which reduces the overall structural strength and makes the bristles relatively easily deformable, otherwise, the bristles are likely to cause sharp tingling on the gums of the user, and the bristles 2 are likely to deform as a whole, which is advantageous for tooth brushing using the pasteur brushing technique.

For the brush filament bundle adjacent to the circumference of the brush plate 1, the height of the brush filaments positioned at the outer side thereof may be lower than the height of the brush filaments positioned at the inner side, so that it is possible to prevent the gum from being punctured.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims (19)

1. A toothbrush head, characterized in that the toothbrush head comprises,

brushing a plate; and a (C) and (D) and,

the brush bristles comprise a first brush wire group, a second brush wire group and a third brush wire group which are distributed in sequence in a first direction and have heights, the brush wires of the first brush wire group, the second brush wire group and the third brush wire group are all fixed with the brush plate and all extend out of the brush plate in a second direction, the heights of the first brush wire group, the second brush wire group and the third brush wire group are the lengths of the brush wires extending out of the brush plate in the second direction, the tips of the brush wires of the first brush wire group define a first brush surface, the tips of the brush wires of the second brush wire group define a second brush surface, the tips of the brush wires of the third brush wire group define a third brush surface, the heights of the first brush wire group gradually increase in the first direction, the heights of the second brush wire group gradually decrease in the second direction, the heights of the third brush wire group gradually increase in the second direction, the second brush surface and the third brush surface form a concave curved surface, and the convex surface of the first brush surface and the second brush surface form an arch curved surface.

2. A toothbrush head according to claim 1 wherein the third group of filaments has a maximum height less than the maximum height of the first group of filaments.

3. A toothbrush head according to claim 1 characterised in that the first group of brush filaments has a length A in the first direction and the bristles have a length B in the first direction and 1/10. Ltoreq. A: B.ltoreq.1/3.

4. A toothbrush head according to claim 1 characterised in that in the first direction the rate of change of height of the first group of brush filaments is less than the rate of change of height of the second group of brush filaments.

5. A toothbrush head according to claim 1 characterised in that the first group of filaments has a length in the first direction which is less than the length of the second group of filaments in the first direction, the second group of filaments including a first section which engages the first group of filaments and a second section which engages the third group of filaments in the first direction; in the first direction, the first segment has a rate of height change that is greater than a rate of height change of the first group of brush filaments, and the first group of brush filaments has a rate of height change that is greater than a rate of height change of the second segment.

6. A toothbrush head according to claim 5 characterised in that the sum of the areas of the orthographic projections of the first group of filaments and the first segment on the brush plate is less than the sum of the areas of the orthographic projections of the second segment and the third group of filaments on the brush plate.

7. A toothbrush head according to claim 1 characterised in that the first group of brush filaments has a length in the first direction of from 2mm to 6mm.

8. A toothbrush head according to claim 1 characterised in that the difference in height between the uppermost and lowermost levels of the first group of filaments is in the range 1mm to 3.5mm.

9. A toothbrush head according to claim 1 characterised in that the difference in height between the highest and lowest height of the third group of brush filaments is from 0.5mm to 2.5mm.

10. A toothbrush head according to claim 1 wherein the difference in height between the highest height of the first group of brush filaments and the highest height of the third group of brush filaments is from 0.5mm to 1.8mm, and the highest height of the first group of brush filaments is greater than the highest height of the third group of brush filaments.

11. A toothbrush head according to claim 1 wherein the difference in height between the highest height of the first group of brush filaments and the lowest height of the third group of brush filaments is from 1.5mm to 2.5mm.

12. A toothbrush head according to claim 1 characterised in that the first group of brush filaments has a maximum width in a third direction which is less than the maximum width of the second group of brush filaments in the third direction, the third direction being perpendicular to both the first and second directions.

13. A toothbrush head according to claim 1 characterised in that a portion of the filaments of the third group are arranged obliquely with respect to the brush plate.

14. A toothbrush head according to claim 1 wherein the first group of filaments includes a plurality of first tufts, the second group of filaments includes a plurality of second tufts, and the third group of filaments includes a plurality of third tufts, all of the first tufts and a portion of the second tufts enclosing a loop to form a first bristle ring, and a portion of the third tufts enclosing a loop to form a second bristle ring.

15. A toothbrush head according to claim 14 wherein the sum of the areas of the orthographic projections of the first tufts, which bound the first bristle rings, on the brush plate is S1, the sum of the areas of the orthographic projections of the second tufts, which bound the first bristle rings, on the brush plate is S2, and S1 is greater than S2.

16. A toothbrush head according to claim 14 wherein the bristles further comprise a first intermediate tuft of bristles and a second intermediate tuft of bristles, the first bristle ring encircling the first intermediate tuft of bristles and the second bristle ring encircling the second intermediate tuft of bristles.

17. A toothbrush head according to claim 14 wherein the number of filaments of the first tuft is less than the number of filaments of the third tuft and the density of the first tuft of the first group of filaments is greater than the density of the third tuft of filaments of the third group of filaments.

18. A toothbrush head according to claim 14 wherein for tufts of filaments adjacent the periphery of the brush plate, the height of the outer filaments is less than the height of the inner filaments.

19. A toothbrush comprising a toothbrush head according to any one of claims 1 to 18.

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