Brush head with transparent back and electric toothbrush

Abstract

The utility model provides a brush head with a transparent back and an electric toothbrush. The brush head with the transparent back comprises a brush rod main body which comprises a brush rod head part, a neck part and a tail part which are connected in sequence, and the brush rod head part is provided with a plurality of through hair planting holes; the plurality of bristle bundles are inserted into the bristle planting holes one by one; the soft rubber body comprises a half-surrounding section and a sleeve section which are connected, the half-surrounding section is provided with a wrapping cavity for achieving half wrapping on the head of the brush rod, the sleeve section is provided with an axial channel for achieving wrapping on the neck, and the wrapping cavity is communicated with one end of the axial channel; the bottom plate is arranged between the back surface of the head part of the brush rod and the semi-surrounding section; wherein the semi-surrounding section has transparency for visually exposing the bottom plate. In this way, the front-back thickness of the brush head is reduced visually. And the bottom plate and the soft rubber body are two independent and different parts, so that the bottom plate and the soft rubber body can be conveniently manufactured by adopting respective proper materials.

Description

Technical Field

[0001] The present application relates to the field of toothbrushes, and in particular to a brush head with a transparent back and an electric toothbrush. Background Art

[0002] The relevant technical field of electric toothbrushes involves the manufacturing process of brush heads. As consumables of electric toothbrushes, brush heads need to be replaced every once in a while.

[0003] The brush head is generally an injection-molded part, and its main function is to come into direct contact with the teeth and clean them. As a component, its functions are relatively simple, and more possible functions need to be realized through the electric toothbrush body (handle) assembled with the brush head.

[0004] A Chinese utility model application with the publication number "CN211884115U" discloses a "new electric toothbrush." ​​This electric toothbrush features an LED light panel inside the brush head and a transparent sealing cover on the back. Light from the LED panel can pass through the transparent sealing cover, and the blue light from the LED panel has the effect of whitening teeth. The back of the brush head is designed to be transparent, with the LED panel emitting light from the inside out. Furthermore, the transparent sealing cover is relatively small and oval in shape, creating a gap at the junction where the transparent sealing cover is assembled. This poses a risk of water ingress and mold formation during long-term use in the oral cavity. Utility Model Content

[0005] In view of the above-mentioned state of the prior art, this application is made. In a first aspect, the purpose of this application is to provide a brush head with a transparent back.

[0006] The technical solutions adopted in this application include:

[0007] A brush head with a transparent back includes: a brush rod body, including a brush rod head, a neck, and a tail connected in sequence, the brush rod head having a plurality of through-going hair-planting holes; bristle bundles, wherein a plurality of the bristle bundles are inserted into the hair-planting holes one by one; a soft colloid, wherein the soft colloid includes a connected semi-enclosed section and a sleeve section, the semi-enclosed section having a wrapping cavity for semi-enclosing the brush rod head, the sleeve section having an axial channel for wrapping the neck, the wrapping cavity being connected to one end of the axial channel; a bottom plate, wherein the bottom plate is arranged between the back side of the brush rod head and the semi-enclosed section; wherein the semi-enclosed section has a transparency that visually exposes the bottom plate.

[0008] As a further improvement of the present application, a surface of the bottom plate facing the bottom surface of the wrapping cavity has a pattern.

[0009] As a further improvement of the present application, the bottom surface of the wrapping cavity is penetrated by a through hole, and the surface of the bottom plate is convexed by a protrusion, which fills and fits into the through hole.

[0010] As a further improvement of the present application, the cross-sectional profile of the protrusion and the opening profile of the through hole are both waist-shaped, and the length direction of the waist-shaped protrusion and the through hole is parallel to the length direction of the brush rod body.

[0011] As a further improvement of the present application, the surface of the base plate is provided with a recessed pit, and the recessed pit and the protrusion are respectively located on the front and back sides of the base plate; along the depth direction of the recessed pit, the projection of the recessed pit falls into the protrusion.

[0012] As a further improvement of the present application, the back of the brush rod head is provided with an inner concave pit, and the edge of the bottom plate is provided with a circle of stop edges, and the stop edges are assembled with the edges of the inner concave pit.

[0013] As a further improvement of the present application, the brush rod head, the neck and the tail of the brush rod body are formed as one piece, and the semi-enclosed section and the sleeve section of the soft colloid are formed as one piece; the material hardness of the soft colloid is less than the material hardness of the brush rod body.

[0014] As a further improvement of the present application, the end of the sleeve segment facing away from the semi-enclosed segment has an end surface of the sleeve segment, and the junction of the neck and the tail of the brush rod body is provided with a step surface, and the end surface and the step surface form a concave-convex matching surface contact; the projections of the end surface and the step surface along the longitudinal direction of the brush rod body coincide with each other; the end surface and the step surface are both non-rotational curved surfaces.

[0015] As a further improvement of the present application, a positioning cylinder is protruded from the front of the brush rod head, and the inner wall of the positioning cylinder coincides axially with the inner wall of the hair planting hole.

[0016] As a further improvement of the present application, a plurality of upright rods are protruded from the back of the brush rod head, and the plurality of upright rods are arranged around the hair planting holes.

[0017] In a second aspect, an electric toothbrush is provided, comprising the above-mentioned brush head with a transparent back.

[0018] The beneficial effects of the brush head and electric toothbrush with a transparent back of the present application include: first, the semi-enclosed section of the soft colloid is transparent, so at least the back of the brush rod body is transparent, so it is easy to see the shape, color, etc. of the bottom plate from the outside to the inside, which makes it easy to make changes to the bottom plate in the toothbrush design. The bottom plate and the soft colloid are two independent and different components, which are convenient for manufacturing with their own suitable materials. The soft colloid only needs to meet the functions of softness and transparency, which reduces the requirements for the selection of soft colloid materials, and some performances in terms of shape, color, pattern, etc. can be met without the soft colloid. Then, compared with the opaque back of the brush head, the front and back thickness of the brush head is reduced from the side visual sense, and the market prefers thinner brush heads because thinner brush heads can achieve more flexible movement in the user's mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is an exploded view of an embodiment of a brush head with a transparent back portion of the present application;

[0021] Figure 2 is another exploded view of an embodiment of a brush head with a transparent back portion of the present application;

[0022] Figure 3 This is a front view of an embodiment of a brush head with a transparent back in the present application;

[0023] Figure 4 This application Figure 3 AA section view;

[0024] Figure 5 It is a left side view of an embodiment of the brush head with a transparent back of the present application;

[0025] Figure 6 This application Figure 5 BB cross-sectional view;

[0026] Figure 7 This is a front view of the soft colloid of one embodiment of the brush head with a transparent back in the present application;

[0027] Figure 8 This is a front view of the soft colloid of one embodiment of the brush head with a transparent back in the present application;

[0028] Figure 9 This is a three-dimensional diagram of the soft colloid of one embodiment of the brush head with a transparent back in the present application.

[0029] Description of Reference Numerals

[0030] 1-brush rod body; 11-brush rod head; 111-planting hole; 112-positioning cylinder; 114-rib; 115-inner pit; 118-pillar rod; 12-neck; 121-through hole; 122-raised platform; 123-convex step; 13-tail; 14-step surface; 2-bristle bundle; 3-soft colloid; 31-semi-enclosed section; 311-wrapped cavity; 316-perforation; 32-sleeve section; 321-through hole; 324-end surface; 325-notch hole; 326-inner convex column; 3261-circular top surface; 3262-conical surface; 4-bottom plate; 41-flat portion; 42-protrusion; 43-recessed pit; 44-stop edge; L1-first distance; L2-second distance; L3-third distance; L4-fourth distance; X1-first left-right distance; Y1-first front-back distance; Z1-first longitudinal distance; J1-first straight-line distance; X2-second left-right distance; Y2-second front-back distance; Z2-second longitudinal distance; J2-second straight-line distance. DETAILED DESCRIPTION

[0031] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible embodiments of the present application, nor to limit the scope of the present application.

[0032] See Figure 1 and Figure 2 , an embodiment of the present application provides a brush head with a transparent back, which includes: a brush rod body 1, a bristle bundle 2 and a soft colloid 3. The brush rod body 1 includes a brush rod head 11, a neck 12, and a tail 13 connected in sequence. The brush rod head 11 has a plurality of through-going bristle planting holes 111; a plurality of bristle bundles 2 are inserted into the bristle planting holes 111 one by one. The soft colloid 3 includes a connected semi-enclosed section 31 and a sleeve section 32. The semi-enclosed section 31 has a wrapping cavity 311 that semi-encloses the brush rod head 11, and the sleeve section 32 has an axial channel 323 that wraps the neck 12. The wrapping cavity 311 is connected to one end of the axial channel 323.

[0033] The back, sides, and part of the front of the brush rod head 11 are wrapped with a semi-enclosed section 31 of the soft colloid 3. The semi-enclosed section 31 half-encloses the brush rod head 11, enhancing the resilience of the brush rod head 11 and improving the comfort in the user's mouth. Secondly, the sleeve section 32 of the soft colloid 3 is sleeved on the neck 12 of the brush rod body 1. Compared with some brush heads known to the inventor, they are two flat-shaped plastics that fit together, and the fitting surface is almost a two-dimensional plane. The semi-enclosed section 31 of the soft colloid 3 is a semi-enclosed form, that is, the inner wall of the soft colloid 3 includes at least one inner wall bottom surface and a circle of inner wall side surfaces to fit with the brush rod head 11. The final fitting surface area can be larger, and the intersection of the inner wall bottom surface and the inner wall side surface forms an angle, so the fitting surface is a three-dimensional surface, not a simple two-dimensional plane. This makes the entire soft colloid 3 firmly assembled with the brush rod body 1, not easy to loosen or crack, thereby also reducing the probability of water ingress and mold here.

[0034] The neck 12 of the brush rod body 1 has a through hole 121, which extends through the brush rod body 1 in the front-to-back direction. That is, the penetration direction of the through hole 121 coincides with the penetration direction of the bristle pores 111 on the same symmetrical longitudinal cross-section of the brush rod body 1. The penetration direction of the through hole 121 is the front-to-back direction, which primarily reduces the bending strength of the neck 12 of the brush rod body 1 in the left-to-right direction, while the bending strength in the front-to-back direction does not change much. This facilitates the left-to-right vibration and swinging of the brush rod head 11 of the brush rod body 1, meeting the requirements of a toothbrush for cleaning the oral cavity.

[0035] In one embodiment, the dimension of the through hole 121 along the longitudinal direction of the brush rod body 1 is not less than the dimension of the through hole 121 along the transverse direction of the brush rod body 1 .

[0036] The beneficial effect of the above embodiment is that the through hole 121 is not a simple circular hole. The shape of the through hole 121 ensures that the through hole 121 does not excessively remove the transverse material of the neck portion 12 of the brush rod body 1. However, the through hole 121 is relatively large along the longitudinal direction of the brush rod body 1. This ensures that the structural characteristics of the neck portion 12 of the brush rod body 1 are conducive to left-right vibration and swinging without being easily broken. During the vibration and swinging of the brush rod body 1, the specific spatial shape of the through hole 121 will also adaptively change periodically.

[0037] At the same time, the centroid of the cavity of the through hole 121 can be located on the longitudinal symmetrical cross-section of the brush rod body 1.

[0038] In one embodiment, the brush handle body 1 comprises a head 11, neck 12, and tail 13 formed integrally. The semi-enclosed section 31 and sleeve section 32 of the soft colloid body 3 are also integrally formed. The soft colloid body 3 is made of a material with a lower hardness than the brush handle body 1. The sleeve section 32 has an inner protrusion 326 projecting from its inner wall. In one example, the inner protrusion 326 is formed by melting the material forming the soft colloid body 3 and filling the through-hole 121.

[0039] The beneficial effects of the above embodiment are as follows: the relatively soft inner boss 326 is melted, filled, and solidified in the through-hole 121 for assembly. First, the assembly of the inner boss 326 and the through-hole 121 indicates that the two are in full surface contact and tightly bonded. Second, although the inner boss 326 fills the through-hole 121, because the inner boss 326 is relatively soft, the structural weakening effect of the through-hole 121 on the neck 12 of the brush rod body 1 still exists. At the same time, the inner boss 326 fills the through-hole 121, allowing the outer wall of the neck 12 of the brush rod body 1 to maintain a smooth and closed shape, which helps to reduce sanitary blind spots.

[0040] The brush rod body 1 and the soft colloid 3 can be made of plastic materials of different specifications.

[0041] In one embodiment, the outer wall of the neck 12 has a raised platform 122 , and one end of the through hole 121 is located at the top of the raised platform 122 ; the sleeve section 32 has a through hole 321 ; the raised platform 122 fills and fits into the through hole 321 .

[0042] Here, the raised platform 122 may be formed on the back side of the neck 12 (the side opposite to the side where the bristles are located), which is beneficial to the vibration and swing of the bristle side.

[0043] The beneficial effects of adopting the above embodiment are: first, the raised platform 122 is equivalent to thickening the front and rear thickness dimensions of the neck 12, thereby improving the structural strength of the neck 12 against bending in the front and rear directions; second, it is also equivalent to lengthening the axial length of the through hole 121 and the height of the inner boss 326, thereby increasing the contact area between the through hole 121 and the inner boss 326, thereby improving the assembly tightness of the two.

[0044] In one embodiment, the cross-sectional profile at the base of the inner boss 326 is waist-shaped. The term "waist-shaped" refers to the same shape as the waist-shaped hole and the oblong hole, i.e., two semicircular arcs with opposing openings connected by two parallel, equal-length line segments. The cross-sectional profiles of the raised platform 122 and one end of the through hole 321 are both waist-shaped. The longitudinal direction of the waist-shaped inner boss 326, the raised platform 122, and the through hole 321 is parallel to the longitudinal direction of the brush rod body 1.

[0045] Due to the presence of the inner convex column 326, the through hole 121 is larger in the front-to-back direction of the brush rod body 1, which reduces the bending structural strength of the neck 12 of the brush rod body 1 along the left-right direction, while maintaining the bending strength in the front-to-back direction, making the brush rod body 1 more suitable for the left-right swinging action requirements, which is in line with the cleaning action of the toothbrush in the oral cavity.

[0046] like Figure 2 、 Figure 4As shown, in one embodiment, the top profile of the inner boss 326 is circular, i.e., a circular top surface 3261. The sidewall of the inner boss 326 is a tapered surface 3262; the cross-sectional area of ​​the inner boss 326 gradually decreases from the root to the top.

[0047] The diameter of the circular top surface 3261 at the top of the inner boss 326 can be equal to the width of the waist-shaped profile at the base of the inner boss 326. Furthermore, the angle of the tapered surface 3262 facing the semi-enclosed segment 31 is smaller than the angle of the tapered surface 3262 facing away from the semi-enclosed segment 31. The thick base and tapered tip of the inner boss 326 facilitates the manufacture of the brush handle body 1 and the soft gel 3 in a composite injection mold using two different materials. The shape of the inner boss 326 also facilitates demolding.

[0048] like Figure 1 As shown, in one embodiment, the front of the neck 12 has a convex step 123, and one side of the convex step 123 is integrally connected to the brush rod head 11; the soft gel 3 has a notch hole 325 that passes through the inside and outside, and one end of the notch hole 325 is connected to the opening edge of the wrapping cavity 311; the convex step 123 fills and is assembled to the notch hole 325.

[0049] The root of the convex step 123 is formed integrally with the neck 12, and one side of the convex step 123 is formed integrally with the brush rod head 11. When viewed from the front of the brush rod body 1, the outline of the notch hole 325 is U-shaped.

[0050] The raised platform 122 and the convex step 123 are arranged one in front of the other, and play a role in strengthening the front and rear bending strength of the neck 12 of the brush rod body 1. The vibration of the brush rod body 1 is reflected in the left and right swing as much as possible.

[0051] It should be noted that the inner boss 326 fills and fits into the through-hole 121, the raised platform 122 fills and fits into the through-hole 321, and the raised step 123 fills and fits into the notched hole 325. The space occupied by the inner boss 326 coincides with the cavity enclosed by the through-hole 121, the space occupied by the raised platform 122 coincides with the cavity enclosed by the through-hole 321, and the space occupied by the raised step 123 coincides with the cavity enclosed by the notched hole 325. Ultimately, the top of the inner boss 326 smoothly transitions to the end of the through-hole 121, the top of the raised platform 122 smoothly transitions to the end of the through-hole 321, and the top of the raised step 123 smoothly transitions to the end of the notched hole 325. This smooth transition can specifically be flush or coplanar.

[0052] The inner convex column 326 is filled and melted and solidified in the through hole 121. Since the inner convex column 326 is softer than the brush rod body 1, the inner convex column 326 is allowed to have a certain elastic deformation. The elastic deformation can absorb the impact force and vibration generated during the use of the toothbrush, thereby reducing stress concentration and enhancing the structural stability of the entire brush rod body 1.

[0053] Although the inner protrusion 326 fills the through-hole 121, due to its relatively soft texture, it does not excessively weaken the structural integrity of the brush handle body 1. At the same time, the close fit between the inner protrusion 326 and the through-hole 121 reduces the possibility of moisture and other contaminants entering the through-hole 121, thereby reducing the risk of internal corrosion of the brush handle body 1 and improving the durability of the product.

[0054] The shape design (such as waist-shaped profile) and material selection (softer) of the inner convex column 326 enable it to undergo adaptive deformation when subjected to external force. This deformation helps to disperse pressure and reduce the risk of damage caused by excessive local stress.

[0055] In one embodiment, the end of the sleeve section 32 facing away from the semi-enclosed section 31 has an end surface 324 of the sleeve section 32, and the junction of the neck 12 and the tail 13 of the brush rod body 1 is provided with a step surface 14, and the end surface 324 and the step surface 14 form a concave-convex matching surface contact; the projections of the end surface 324 and the step surface 14 along the longitudinal direction of the brush rod body 1 coincide with each other; the end surface 324 and the step surface 14 are both non-rotational curved surfaces.

[0056] The advantages of the above embodiment are as follows: First, the end surface 324 is completely connected to the stepped surface 14, achieving a smooth transition between the outer wall of the soft colloid 3 and the outer wall of the middle and tail portion 13 of the brush handle body 1, maintaining an aesthetically pleasing appearance. Second, both the end surface 324 and the stepped surface 14 are non-revolutionary surfaces, which provides greater structural stability at the joint between the two and prevents the soft colloid 3 from loosening due to rotation or other factors near this location on the brush handle body 1.

[0057] like Figure 1 As shown, the front of the brush rod head 11 has several positioning cylinders 112 protruding, and the inner wall of the positioning cylinder 112 is axially overlapped with the inner wall of the hair planting hole 111. Axial overlap here means overlap when observed or projected along the axial direction, that is, having the same radial size or position.

[0058] The beneficial effects of the above embodiment are as follows: the inner wall of the positioning cylinder 112 smoothly transitions with the inner wall of the bristle planting hole 111, and the positioning cylinder 112 is equivalent to an axial extension of the inner wall of the bristle planting hole 111. The positioning cylinder 112 firstly facilitates assembly and can guide the bristle bundle 2 smoothly into the bristle planting hole 111; secondly, it increases the axial dimension of the bristle planting hole 111 at this location, thereby improving the anti-lodging ability of the bristle bundle 2 at this location.

[0059] like Figure 2 、 Figure 6 As shown, a plurality of upright rods 118 are protruded from the back of the brush rod head 11 , and the plurality of upright rods 118 are arranged around the plurality of hair planting holes 111 .

[0060] The number of pillar rods 118 is greater than the number of bristle planting holes 111. The axial length and diameter of the pillar rod 118 are respectively smaller than the axial length and diameter of the bristle planting holes 111. The part of the brush rod head 11 between adjacent bristle planting holes 111 constitutes the rib 114, and the pillar rod 118 protrudes integrally from the rib 114. During the assembly operation of the bristle bundle 2 and the brush rod head 11, the root of the bristle bundle 2 is fixedly combined with the pillar rod 118 by sintering and melting, and the bristle bundle 2 in the molten state will diffuse, that is, the molecular motion is enhanced in the molten state, and the root of the bristle bundle 2 loses its fixed shape and exhibits flow characteristics. The root of the bristle bundle 2 can diffuse radially outward along the bristle planting holes 111, and then contact the pillar rod 118 or even surround part of the pillar rod 118. After the bristle bundle 2 cools and solidifies, it is fully fixed to the pillar rod 118, so that the bristle bundle 2 has a stronger anti-loosening ability. Because the sintered and melted shape is unstable, it is not shown in the accompanying drawings. Figure 4 As shown, the bristle bundle 2 is also in a state where it has not yet been fully assembled with the hair implantation hole 111.

[0061] In a non-limiting example, the distance between two adjacent hair implantation holes 111 is between 0.9 mm and 1.1 mm.

[0062] In a non-limiting example, the diameter of the hair implantation hole 111 is between 1.5 mm and 4.0 mm.

[0063] In a non-limiting example, the distance between the positioning cylinder 112 and the adjacent hair implantation hole 111 is between 0.4 mm and 1.1 mm.

[0064] In a non-limiting example, the thickness of the positioning cylinder 112 (ie, the distance from the inner wall to the outer wall of the positioning cylinder 112 ) is between 0.4 mm and 0.6 mm, preferably 0.5 mm.

[0065] In one embodiment, a bottom plate 4 is further included. The bottom plate 4 is disposed between the back of the brush rod head 11 and the semi-enclosed section 31. The semi-enclosed section 31 is transparent. A logo or pattern may be printed on the side of the bottom plate 4 facing the bottom of the wrapping cavity 311.

[0066] The transparent wrapping cavity 311, compared to an opaque design, has two purposes: first, it reduces the front-to-back thickness of the brush handle 1 from a side-view perspective. This thinner brush handle 1 allows for greater mobility within the user's mouth, making it more popular in the market. Second, it allows the user to see directly through the wrapping cavity 311 of the soft gel 3 to the base plate 4 from a back-to-front perspective. The base plate 4 can be printed with aesthetically pleasing patterns or trademarks, etc.

[0067] The bottom surface of the wrapping cavity 311 is penetrated by a perforation 316. The main body of the bottom plate 4 is a flat plate portion 41, with a protrusion 42 protruding from the surface of the bottom plate 4. Protrusion 42 can be located at the centroid of the flat plate portion 41 and fills and fits into the perforation 316. In this case, strictly speaking, the wrapping cavity 311 has an opening in each of the front and rear directions. The rear opening area of ​​the wrapping cavity 311 can be smaller than the front opening area of ​​the wrapping cavity 311.

[0068] The beneficial effects of adopting the above embodiment are: the assembly of the protrusion 42 and the through-hole 316 increases the contact area between the base plate 4 and the soft colloid 3, thereby improving the connection tightness between the two; secondly, the base plate 4 and the soft colloid 3 are not simply in plane contact, but have surface contacts at multiple locations at different angles, further improving the connection tightness between the base plate 4 and the soft colloid 3 in all directions.

[0069] The cross-sectional profile of the protrusion 42 and the opening profile of the through hole 316 may both be waist-shaped, and the length directions of the waist-shaped protrusion 42 and the through hole 316 are parallel to the longitudinal direction of the brush rod body 1 .

[0070] The waist shape formed by the mutual matching of the protrusion 42 and the through hole 316 is also adapted to the longitudinally longer brush rod head 11 .

[0071] It should be noted that the waist-shaped contours of the inner convex column 326, the through hole 121, the raised platform 122, the through hole 321, the protrusion 42, and the through hole 316 are all intended to adapt to the relatively long longitudinal dimension of the brush rod body 1; secondly, because of the rounded contour of the waist, there is no stress concentration point in the soft colloid 3, and the junction between the soft colloid 3 and the brush rod body 1 or the bottom plate 4 is not easy to crack, and the soft colloid 3 is not easy to tear during long-term use.

[0072] like Figure 7 As shown, there are two distances between the edge of the circular top surface 3261 at the top of the inner convex column 326 and the edge of the through hole 321, namely a first distance L1 and a second distance L2. The first distance L1 and the second distance L2 are both along the longitudinal direction of the brush handle body 1 and the soft colloid 3. The first distance L1 refers to the straight-line distance from the edge of the circular top surface 3261 to the edge of the through hole 321 along the longitudinal direction of the soft colloid 3 and toward the brush handle head 11. The preferred distance for the first distance L1 is 3.27 mm. The second distance L2 refers to the straight-line distance from the edge of the circular top surface 3261 to the edge of the through hole 321 along the longitudinal direction of the soft colloid 3 and toward the tail 13. The preferred distance for the second distance L2 is 6.57 mm.

[0073] like Figure 8As shown, the top and base of the inner protrusion 326 each have two dimensions, namely, a third distance L3 and a fourth distance L4. Both the third distance L3 and the fourth distance L4 are along the longitudinal direction of the brush handle body 1 and the soft colloid 3. The third distance L3 refers to the dimension of the top of the inner protrusion 326 (i.e., the circular top surface 3261) along the longitudinal direction of the soft colloid 3. The preferred dimension of the third distance L3 is 1.76 mm. The fourth distance L4 refers to the dimension of the base of the inner protrusion 326 along the longitudinal direction of the soft colloid 3. The preferred dimension of the fourth distance L4 is 4.51 mm.

[0074] like Figure 9 As shown, Figure 9 The size and distance relationship between the through hole 321 and the soft colloid 3 is further optimized, which increases the elasticity of the soft colloid 3 and facilitates providing a stronger cleaning force. The position on the left and right sides of the soft colloid 3 and at the intersection of the semi-enclosed section 31 and the sleeve section 32 is set as the first positioning point. The first positioning point can be the tangent intersection of the concave surface and the convex surface. The position on the outer wall of the soft colloid 3 and at the position closest to the semi-enclosed section 31 of the through hole 321 is set as the second positioning point. The position on the left and right sides of the soft colloid 3 and at the end face 324 is set as the third positioning point. The third positioning point can be the position closest to the semi-enclosed section 31 on the end face 324. The position on the outer wall of the soft colloid 3 and at the position farthest from the semi-enclosed section 31 of the through hole 321 is set as the fourth positioning point. The longitudinal distance from the third positioning point to the semi-enclosed section 31 can be smaller than the longitudinal distance from the fourth positioning point to the semi-enclosed section 31.

[0075] like Figure 9 As shown, the straight-line distance from the first positioning point to the second positioning point is the first straight-line distance J1, and the first straight-line distance J1 is between 8.0 mm and 9.0 mm. The preferred distance of the first straight-line distance J1 may be 8.37 mm. The distance from the first positioning point to the second positioning point in the left-right direction along the brush rod body 1 is the first left-right distance X1, and the first left-right distance X1 is between 4.0 mm and 5.0 mm. The preferred distance of the first left-right distance X1 may be 4.93 mm. The distance from the first positioning point to the second positioning point in the front-to-back direction along the brush rod body 1 is the first front-to-back distance Y1, and the first front-to-back distance Y1 is between 2.0 mm and 3.0 mm. The preferred distance of the first front-to-back distance Y1 may be 2.8 mm. The distance from the first positioning point to the second positioning point in the longitudinal direction along the brush rod body 1 is the first longitudinal distance Z1, and the first longitudinal distance Z1 is between 6.0 mm and 7.0 mm. The preferred distance of the first longitudinal distance Z1 may be 6.15 mm.

[0076] The straight-line distance from the third positioning point to the fourth positioning point is the second straight-line distance J2, which is between 5.0 mm and 6.0 mm. The preferred distance of the second straight-line distance J2 may be 5.61 mm. The distance from the third positioning point to the fourth positioning point in the left-right direction along the brush rod body 1 is the second left-right distance X2, which is between 3.0 mm and 4.0 mm. The preferred distance of the second left-right distance X2 may be 3.51 mm. The distance from the first positioning point to the second positioning point in the front-to-back direction along the brush rod body 1 is the second front-to-back distance Y2, which is between 2.0 mm and 3.0 mm. The preferred distance of the second front-to-back distance Y2 may be 2.93 mm. The distance from the first positioning point to the second positioning point in the longitudinal direction along the brush rod body 1 is the second longitudinal distance Z2, which is between 3.0 mm and 4.0 mm. The preferred distance of the second longitudinal distance Z2 may be 3.25 mm.

[0077] like Figure 4 As shown, the surface of the bottom plate 4 has a recessed pit 43 , and the recessed pit 43 and the protrusion 42 are respectively located on the front and back sides of the bottom plate 4 ; along the depth direction of the recessed pit 43 , the projection of the recessed pit 43 is located inside the protrusion 42 .

[0078] The beneficial effects of adopting the above embodiment are: the recessed pit 43 and the protrusion 42 extend in the same direction, which firstly reduces the material consumption of the base plate 4; secondly, the recessed pit 43 leaves a cavity, so that when the bristle bundle 2 is assembled with the brush rod head 11, there is space for gas compression on the back of the brush rod head 11, thereby facilitating the smooth implantation of the bristle bundle 2 into the implanting hole 111. Otherwise, the gas in the implanting hole 111 may hinder the smooth implantation of the bristle bundle 2 due to the air pressure in the enclosed space.

[0079] The back of the brush rod head 11 is provided with an inner pit 115 , and the edge of the bottom plate 4 is provided with a circle of stop edges 44 , which are assembled with the edge of the inner pit 115 .

[0080] The beneficial effect of the above embodiment is that the stop edge 44 creates a right-angled inner corner around the edge of the bottom plate 4, thereby facilitating the entry of part of the bottom plate 4 into the inner recess 115, while part of the bottom plate 4 is located outside the inner recess 115, limiting the distance from the bottom plate to the bottom surface of the inner recess 115. This leaves space for the molten bristle bundle 2 to fully contact and secure with the pillar rod 118.

[0081] Figure 3 and Figure 5 They are respectively the front view and the side view of the finished product of the brush head with a transparent back. In the finished product, the brush rod body 1 and the soft colloid 3 of the brush head with a transparent back are tightly fitted.

[0082] On the other hand, the present application also provides an electric toothbrush, which adopts the above-mentioned brush head with a transparent back.

[0083] The electric toothbrush may be a vibrating electric toothbrush, which includes a motor that drives the brush rod body 1 to vibrate or swing back and forth in the left and right directions.

[0084] like Figure 4 、 Figure 6 As shown, the brush rod body 1 has a blind hole at one end facing the motor, and the motor is assembled directly or indirectly with the blind hole.

[0085] The above embodiments are only for illustrating the technical concepts and features of the present application. Their purpose is to enable people familiar with this technology to understand the content of the present application and implement it. They cannot be used to limit the scope of protection of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A brush head with a transparent back, characterized in that: include: The brush rod body includes a brush rod head, a neck, and a tail connected in sequence, wherein the brush rod head has a plurality of through-holes for planting hair; Brush bristle bundles, wherein a plurality of the brush bristle bundles are inserted into the hair implantation holes one by one; A soft colloid, the soft colloid comprising a connected semi-enclosed section and a sleeve section, the semi-enclosed section having a wrapping cavity for semi-enclosing the brush rod head, the sleeve section having an axial channel for wrapping the neck, the wrapping cavity being in communication with one end of the axial channel; A bottom plate, the bottom plate being arranged between the back side of the brush rod head and the semi-enclosed section; The semi-enclosed section has transparency that visually exposes the bottom plate.

2. The brush head with a transparent back according to claim 1, characterized in that: A surface of the bottom plate facing the bottom surface of the wrapping cavity has a pattern.

3. The brush head with a transparent back according to claim 1, characterized in that: The bottom surface of the wrapping cavity is penetrated by a through hole, and the surface of the bottom plate is protruded by a protrusion, which fills and fits into the through hole.

4. The brush head with a transparent back according to claim 3, characterized in that: The cross-sectional profile of the protrusion and the opening profile of the through hole are both waist-shaped, and the length directions of the waist-shaped protrusion and the through hole are parallel to the length direction of the brush rod body.

5. The brush head with a transparent back according to claim 3, characterized in that: The surface of the bottom plate is provided with a concave pit, and the concave pit and the protrusion are respectively located on the front and back sides of the bottom plate; Along the depth direction of the concave pit, the projection of the concave pit falls into the protrusion.

6. The brush head with a transparent back according to claim 1, characterized in that: The back of the brush rod head is provided with an inner concave pit, and the edge of the bottom plate is provided with a circle of stop edges, and the stop edges are assembled with the edges of the inner concave pit.

7. The brush head with a transparent back according to claim 1, characterized in that: The brush rod head, the neck, and the tail of the brush rod body are formed integrally, and the semi-enclosed section and the sleeve section of the soft colloid are formed integrally; the hardness of the soft colloid is less than that of the brush rod body.

8. The brush head with a transparent back according to claim 1, characterized in that: The end of the sleeve section away from the semi-enclosed section has an end surface of the sleeve section, and the junction between the neck and the tail of the brush rod body has a step surface, and the end surface and the step surface form a concave-convex matching surface contact; The projections of the end surface and the step surface along the longitudinal direction of the brush rod body coincide with each other; The end surface and the step surface are both non-revolutionary curved surfaces.

9. The brush head with a transparent back according to claim 1, characterized in that: A positioning cylinder is protruded from the front of the brush rod head, and the inner wall of the positioning cylinder coincides with the inner wall of the hair planting hole along the axial direction.

10. The brush head with a transparent back according to claim 1, characterized in that: A plurality of upright rods are protruded from the back of the brush rod head, and the plurality of upright rods are arranged around the hair planting holes.

11. An electric toothbrush, characterized in that: A brush head with a transparent back according to any one of claims 1 to 10.

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