Toothbrush

Abstract

The invention provides a toothbrush which reduces collision on the inner wall of the oral cavity when the toothbrush is inserted into the deep part of the oral cavity and improves operability in the oral cavity. This toothbrush (1) is provided with: a head part (2) in which a plurality of bristle bundles (3) are each implanted at a right angle to a bristle implanting surface (20); the neck part (5) is connected with the head part (2); in the toothbrush (1), the head part (2) is composed of a base end side part (21) extending in the length direction from the front end of the neck part (5) and a front end side part (23) extending in the length direction from the front end of the base end side part (21) through a step, and the front end side part (23) inclines in the bristle tip direction where the bristle bundles (3) extend.

Description

Technical Field

[0001] This invention relates to a highly operable toothbrush. Background Technology

[0002] In recent years, toothbrushes with thinner heads have been proposed to make them easier to reach deep into the mouth, thereby improving their operability in the mouth (e.g., see Patent Document 1, etc.).

[0003] However, when cleaning molars, the gap between the molars and the inner wall of the mouth is narrow, and the edge of the toothbrush head can collide with this inner wall, hindering the operation of the toothbrush.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-114423 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In view of this, the present invention provides a toothbrush that reduces impact on the oral cavity wall when the toothbrush head is inserted deep into the oral cavity, thereby improving operability in the oral cavity.

[0009] Technical solutions for solving the problem

[0010] The toothbrush of the present invention includes: a head in which a plurality of bristle bundles are respectively planted at right angles to the bristle planting surface; a neck continuously disposed with the head; and a grip portion continuously disposed with the neck. In the toothbrush, the head is composed of a base end side portion extending in the length direction from the front end of the neck and a front end side portion extending in the length direction from the front end of the base end side portion via a step, the front end side portion being inclined toward the bristle tip direction of the bristle bundles.

[0011] Furthermore, the toothbrush of the present invention includes: a head in which a plurality of bristle bundles are respectively planted at right angles relative to the bristle planting surface; a neck continuously disposed with the head; and a grip portion continuously disposed with the neck. In the toothbrush, the head is composed of a base end side portion extending in a length direction from the front end of the neck and an outer edge side portion extending in an expanding direction in a peripheral direction from the outer edge side of the base end side portion via a step. The outer edge side portion is inclined toward the bristle tip direction of the bristle bundles.

[0012] This type of toothbrush reduces impact on the oral cavity walls when inserted deep into the mouth, improving its operability. Furthermore, by embedding the bristle tufts at a right angle to the bristle attachment surface, this toothbrush allows for efficient and reliable bristle attachment to the head.

[0013] Furthermore, the outer edge portion preferably includes a front end portion extending from the front end of the base end portion along the length direction, and a pair of left and right side portions extending from the side of the base end portion along a left-right width direction orthogonal to the length direction.

[0014] According to this toothbrush, when inserted deep into the mouth, it will not only reduce the impact of the toothbrush head on the inner wall of the mouth, but also reduce the impact of the head on the inner wall of the mouth when brushing in the up-down direction.

[0015] Furthermore, the hair-grafting surface includes a base-side implantation surface disposed on the base-side portion and a front-side implantation surface disposed on the front-side portion. Preferably, the base-side implantation surface and the front-side implantation surface are parallel, and are formed in a stepped shape by the base-side implantation surface and the front-side implantation surface.

[0016] Furthermore, the hair-grafting surface includes a base-side implantation surface disposed on the base-side portion and an outer-side implantation surface disposed on the outer-side portion. Preferably, the hair-grafting surface is continuous from the base-side portion to the outer-side portion and is formed into a stepped shape by the base-side implantation surface and the outer-side implantation surface.

[0017] With this toothbrush, the bristle tuft installation process can be carried out efficiently, and the bristle head can be reliably installed.

[0018] In addition, it is preferable to open a plurality of hair implantation holes of uniform depth on the base-side implantation surface and the front-side implantation surface for implanting the bristle bundle.

[0019] In addition, it is preferable to open a plurality of hair implantation holes of uniform depth on the implantation surface at the base end and the implantation surface at the outer edge for implanting the bristle bundle.

[0020] With this type of toothbrush, since the bristle bundles are implanted in pores of the same depth, it is easy to shape the head thickness evenly and maintain the strength of the head.

[0021] Furthermore, the outer edge portion preferably has the front end and the pair of side portions connected to form a roughly U-shaped form when viewed from above.

[0022] The toothbrush with this design features a roughly U-shaped head, which increases its strength. Furthermore, when cleaning the mouth, water flows out from the roughly U-shaped opening, making it easy to remove toothpaste and stains remaining on the brush.

[0023] Invention Effects

[0024] A toothbrush that can reduce the impact on the inner wall of the mouth when the toothbrush is inserted deep into the mouth and improve maneuverability in the mouth. Attached Figure Description

[0025] Figure 1 This is a perspective view of a toothbrush according to the first embodiment of the present invention.

[0026] Figure 2 It means Figure 1 A magnified view of a portion of the toothbrush head shown.

[0027] Figure 3 It means Figure 2 The cross-sectional view of the head at section A1-A1 is shown.

[0028] Figure 4A This is a schematic diagram showing the horizontal lines when the bristle bundles are implanted in the bristle holes.

[0029] Figure 4B This is a schematic diagram showing the horizontal lines when the bristle bundles are implanted in the bristle holes.

[0030] Figure 5A It means to use Figure 1 The diagram shows how a toothbrush cleans the inside of the mouth.

[0031] Figure 5B This is a diagram illustrating oral cleaning using an existing toothbrush.

[0032] Figure 6 This is a perspective view of a toothbrush according to a second embodiment of the present invention.

[0033] Figure 7 It means Figure 6 A magnified view of a portion of the toothbrush head shown.

[0034] Figure 8A It means Figure 7 The cross-sectional view of the head at section A2-A2 is shown.

[0035] Figure 8B It means Figure 7 The cross-sectional view of the head at section B2-B2 is shown.

[0036] Figure 9 This is a partially enlarged view showing the head of the toothbrush according to the third embodiment of the present invention.

[0037] Figure 10A It means Figure 9 The cross-sectional view of the head at section A3-A3 is shown.

[0038] Figure 10B It means Figure 9 The cross-sectional view of section B3-B3 of the head is shown.

[0039] Figure 11AIt means Figure 6 A magnified view of the back of the head shown.

[0040] Figure 11B It means Figure 11A The image shows a side view of the head.

[0041] Figure 11C It means Figure 11A The image shows a side view of the front end of the head.

[0042] Figure 12A It means Figure 9 A magnified view of the back of the head shown.

[0043] Figure 12B It means Figure 12A The image shows a side view of the head.

[0044] Figure 12C It means Figure 12A The image shows a side view of the front end of the head. Detailed Implementation

[0045] The toothbrush 1 according to the first embodiment of the present invention will be described. Figure 1 This is a perspective view of a toothbrush 1 according to the first embodiment of the present invention. Figure 2 It means Figure 1 A magnified view of the head 2 of the toothbrush 1 shown. Figure 3 It means Figure 2 The cross-sectional view of the head at section A1-A1 is shown.

[0046] Figures 1-3 The toothbrush 1 of the first embodiment shown includes: a head 2 on which a plurality of bristle bundles 3 are respectively implanted in one direction on the bristle surface 20; a neck 5 connected to the head 2; and a grip portion 7 connected to the neck 5. The head 2, neck 5, and grip portion 7 can be formed using commonly used synthetic resins without particular limitation. For example, it is preferable to use any one or more resins such as polypropylene, polyacetal resin, polybutylene terephthalate resin, polystyrene resin, polyethylene terephthalate resin, acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene resin, cellulose propionate resin, polyarylate resin, polycarbonate resin, polyester, polypropylene glycol terephthalate, and polycyclohexanediol terephthalate. Polyacetal resin, polybutylene terephthalate resin, acrylonitrile-butadiene-styrene resin, polycarbonate resin, and polycyclohexanediol terephthalate are particularly preferred.

[0047] Furthermore, the head 2, neck 5, and grip 7 are preferably integrally formed. The bristle bundle 3 is composed of multiple filaments formed from resins with appropriate elasticity, such as nylon, aramid resin, polyamide resin, polyethylene terephthalate, polyethylene terephthalate, or polybutylene terephthalate, polyester resin, polyolefin resin, polypropylene, thermoplastic elastomer resin, or other existing known thermoplastic resin filaments.

[0048] like Figure 2 As shown, the head 2 is composed of a base-side portion 21 and a front-side portion 23. The base-side portion 21 extends from the front end of the neck 5 along the length direction. The front-side portion 23 is formed from the front end of the base-side portion 21 along the length direction and is inclined toward the tip of the bristle bundle 3. Here, "inclined" means not only that the front-side portion 23 extends straight relative to the base-side portion 21 at a certain angle as in this embodiment, but also that a part or all of the front-side portion 23 extends in a curved manner while changing the aforementioned angle, or other manner.

[0049] The head 2 includes a continuously extending bristle-planting surface 20 from the base-side portion 21 to the front-side portion 23 and a bristle-planting surface 4 located on the opposite side of the bristle-planting surface 20. The bristle-planting surface 20 includes a base-side implantation surface 201 disposed on the base-side portion 21 and a front-side implantation surface 203 disposed on the front-side portion 23, the base-side implantation surface 201 and the front-side implantation surface 203 being orthogonal to the implantation direction of the bristle bundle 3. The bristle-planting surface 20 is formed in a multi-step shape from the front end of the base-side portion 21 to the front end of the front-side portion 23 by the presence of a wall surface 202 extending along the implantation direction of the bristle bundle 3 between the base-side implantation surface 201 and the front-side implantation surface 203. The inclination of the front end portion 23 refers to the inclination of the virtual surface 230, which is located at the midpoint of the thickness direction of the front end face of the front end portion 23 and at the midpoint of the thickness direction of the front end portion 21, relative to the virtual surface 210, which is located at the midpoint of the thickness direction of the front end portion 21 and at the midpoint of the thickness direction of the front end portion 5. Furthermore, in this embodiment, the number of steps from the front end of the base end portion 21 to the front end of the front end portion 23 is three (three-tiered), but it can be formed in a stepped shape depending on the number of bristle bundles 3, and the number of steps is not limited.

[0050] In addition, the 20-fold hair-embedded surface Figure 3As shown, the wall surface 202 can extend while bending or folding, preferably extending flat with a predetermined slope relative to either the base-side implant surface 201 or each of the front-side implant surfaces 203. The predetermined slope is simply the degree to which it is easy to demold from the mold when shaping the head 2, neck 5, and gripping part 7; it is not particularly limited, but preferably 0 to 25 degrees. Furthermore, in this embodiment, the stepped bristle-planting surface 20 formed by the base-side implant surface 201, wall surface 202, and each of the front-side implant surfaces 203 has three steps, but since the number of steps can be adjusted according to the design of how the bristle bundles 3 are implanted, the number of steps is not limited. Furthermore, as... Figure 3 As shown, in the step-shaped hair grafting surface 20 formed by the base-side implantation surface 201, the wall surface 202, and each front-side implantation surface 203, the values ​​of each height difference, i.e., each step difference, can be different from each other, but are preferably equal to each other. In addition, the step difference of each step is preferably 0.1 to 3 mm, and it is desirable that the total step difference of the head 2 is 0.1 to 6 mm.

[0051] Multiple hair-implanting holes 22 for implanting bristle bundles 3 are respectively provided on the basal implantation surface 201 and the anterior implantation surface 203. The hair-implanting holes 22 are orthogonal to the basal implantation surface 201 and the anterior implantation surface 203, respectively, and preferably have a uniform depth. When the depth of the hair-implanting holes 22 is uniform, the hair removal intensity of each bristle bundle 3 implanted on the basal implantation surface 201 and the anterior implantation surface 203 becomes the same.

[0052] Figure 4A and Figure 4B This is a schematic diagram showing the horizontal line 9 when the bristle bundle 3 is implanted in the bristle implantation hole 22. (The diagram is presented as follows...) Figure 4A As shown in the front-end portion 23, the bristle bundle 3 and the horizontal line 9 are pressed in from one direction along the hair implantation hole 22, with the horizontal line 9 serving as the anchoring part, and the bristle bundle 3 is implanted in the hair implantation hole 22. If the front-end portion 23A, where the base-side implantation surface 201 and the front-end-side implantation surface 203 of the implanted bristle bundle 3 are not orthogonal to the implantation direction, then... Figure 4B As shown, when the flat liner 9 is pressed into the hair implantation hole 22, one side of the flat liner 9 touches the hair implantation hole 22 and tilts. When the bristle bundle 3 is implanted into the hair implantation hole 22 while the flat liner 9 is tilted, the bristle bundle 3 is prone to falling off. If the bristle bundle 3 is implanted from a direction orthogonal to the tilted surface of the front end portion 23A, the bristle bundle 3 must be implanted into the head 2 in at least two directions, which is inefficient in the manufacturing process. Therefore, even when the flat liner 9 is pressed into the hair implantation hole 22 opened along the implantation direction, since the base-side implantation surface 201 and the front-side implantation surface 203 are orthogonal to the implantation direction, the flat liner 9 does not tilt, and the bristle bundle 3 can be reliably implanted into the head 2.

[0053] Furthermore, the bristle pores 22 can be arranged appropriately according to the combination of bristle bundles 3 of different materials and the shape of the bristle tips 3. They can be arranged at equal intervals along the length direction and the width direction on both sides, or in an alternating pattern. As long as the cleaning performance of the toothbrush 1 is achieved, the arrangement of the bristle pores 22 is not particularly limited.

[0054] In addition, such as Figure 1 As shown, the bristle bundles 3 are implanted into each implantation hole 22 by varying the height of their bristle lengths according to the base-side implantation surface 201 and the front-side implantation surface 203, forming a bristle portion 30 with approximately flush bristle tips. Furthermore, the bristle tips of the bristle portion 30 can be formed into an undulating shape such as a mountain-shaped form, or the bristle bundles 3 can be made entirely of equal bristle length, forming a bristle portion 30 with bristle tips corresponding to the stepped implantation surface 20 formed by the base-side implantation surface 201 and the front-side implantation surface 203. This is not a limitation, as long as it does not impair the operability of the toothbrush in the oral cavity and improves cleaning performance.

[0055] Furthermore, the back surface 29 is composed of a base-side back surface 291 provided on the base-side portion 21 and a front-side back surface 293 provided on the front-side portion 23. The base-side back surface 291 preferably extends substantially flat from the neck 5, but may also have a step difference between it and the neck 5. The front-side back surface 293 corresponds to the stepped shape of the bristle implantation surface 20 and the bottom position of the bristle implantation hole 22, and bends from the front end of the base-side back surface 291 toward the edge of the front-side portion 23 of the uppermost stepped surface of the front-side implantation surface 203. Considering the cleanliness of the deep oral cavity of the toothbrush 1 and the durability of the head 2 to the brushing pressure, the inclination of the front-side portion 23 relative to the base-side portion 21 is preferably set such that the angle H of the front-side back surface 293 relative to the base-side back surface 291 is 1 to 55 degrees.

[0056] Figure 5A It means to utilize Figure 1 The diagram shows toothbrush 1 cleaning inside the mouth. Figure 5B This is a diagram illustrating oral cleaning using an existing toothbrush B. When the existing toothbrush B is inserted into the tooth T near the pharynx, as... Figure 5B As shown, the anterior end collides with the inner wall W of the oral cavity. This differs from, as... Figure 5A As shown, even when the toothbrush 1 of the present invention is inserted into a tooth T near the pharynx in the same manner as the conventional toothbrush B, the front side back surface 293 of the front side portion 23 is inclined toward the bristle implantation surface 20, thus reducing the impact of the front end on the oral cavity wall W.

[0057] Furthermore, the bristle portion 30 preferably has longer bristle bundles 3 implanted on the base side portion 21 and shorter bristle bundles 3 implanted on the front side portion 23, so that the bristle tips are roughly flush. As a result, the front end of the toothbrush 1 narrows in the direction of the bristle bundles 3 implantation, making it easy to insert the toothbrush 1 even if there is a narrow space between the tooth T or gingiva G and the oral cavity wall W.

[0058] Furthermore, the bristle bundles 3 implanted on the anterior implant surface 203 have shorter bristle lengths than those implanted on the basal implant surface 201, resulting in greater bristle stiffness and improved cleaning performance on the tooth surface. On the other hand, the bristle bundles 3 implanted on the basal implant surface 201 are longer than those implanted on the anterior implant surface 203, resulting in softer bristle stiffness and improved interdental cleaning performance. Additionally, all the bristle bundles 3 implanted on the bristle implant surface 20 are aligned in one direction, thus distributing the brushing pressure evenly across the bristle portion 30, further enhancing cleaning performance.

[0059] The toothbrush 1 according to the second embodiment of the present invention will be described. Figure 6 This is a perspective view of a toothbrush 1 according to the second embodiment of the present invention. Figure 7 It means Figure 6 A magnified view of the head 4 of the toothbrush 1 shown. Figure 8A It means Figure 7 The cross-sectional view of the head 4 at section A2-A2 is shown. Figure 8B It means Figure 7 The diagram shows a cross-sectional view of the head 4 along section B2-B2. Furthermore, descriptions of portions corresponding to the first embodiment are omitted; instead, the technical features of the second embodiment, which differs from the first embodiment, will be highlighted.

[0060] Figures 6 to 8B The toothbrush 1 of the second embodiment shown is the same as that of the first embodiment, including a head 4 in which a plurality of bristle bundles 3 are respectively implanted in the bristle surface 40 in one direction, a neck 5 connected to the head 4, and a grip portion 7 connected to the neck 5.

[0061] like Figure 7 As shown, the head 4 is composed of a base-side portion 41 and an outer-edge-side portion 43. The base-side portion 41 extends from the front end of the neck 5 in the length direction. The outer-edge-side portion 43 extends from the outer edge of the base-side portion 41 in an expanding direction that extends outwards and is inclined toward the tips of the bristle bundle 3. The outer-edge-side portion 43 includes a front end portion 431 extending from the front end of the base-side portion 41 in the length direction and a pair of left and right side portions 433, 433 extending from the sides of the base-side portion 41 in a left-right width direction orthogonal to the length direction.

[0062] Furthermore, the outer edge portion 43 preferably has a front end 431 connected to a pair of side portions 433, 433, forming a generally U-shaped shape facing the neck 5. This allows saliva and toothpaste that overflows during oral hygiene to flow out from the generally U-shaped opening 400, preventing it from dripping into unintended areas. Moreover, the generally U-shaped shape formed by connecting the front end 431 and the pair of side portions 433, 433 ensures the strength of the head 4.

[0063] The head 4 includes a bristle implantation surface 40 connected from the base-side portion 41 to the outer edge-side portion 43 and a back surface 49 located on the opposite side of the bristle implantation surface 40. The bristle implantation surface 40 includes a base-side implantation surface 401 provided on the base-side portion 41, a front-side implantation surface 404 provided on the front end portion 431, and a lateral implantation surface 405 provided on the side portion 433. The base-side implantation surface 401, the front-side implantation surface 404, and the lateral implantation surface 405 are orthogonal to the implantation direction of the bristle bundle 3.

[0064] like Figure 7 , Figure 8A and Figure 8B As shown, the anterior implant surface 404 and a pair of lateral implant surfaces 405 are connected in the order of lateral implant surface 405, anterior implant surface 404, and lateral implant surface 405 to form the outer edge implant surface 403. The bristle implant surface 40 is located between the basal implant surface 401 and the outer edge implant surface 403 by a wall surface 402 extending along the implantation direction of the bristle bundle 3, so that a two-step stepped shape is formed from the front end of the basal portion 41 to the front end of the outer edge portion 43. The inclination of the front end 431 of the outer edge portion 43 refers to the inclination of the virtual surface 432 at the midpoint of the thickness direction of the front end face of the front end 431 and the midpoint of the thickness direction of the front end face of the basal portion 41 relative to the virtual surface 434 at the midpoint of the thickness direction of the front end face of the basal portion 41 and the midpoint of the thickness direction of the front end face of the neck 5. Furthermore, the inclination of the side portion 433 of the outer edge side portion 43 refers to the inclination of the virtual surface 436, which is located at the midpoint of the thickness direction of the outer surface of the side portion 433 and at the midpoint of the thickness direction of the central portion of the base end side portion 41, relative to the virtual surface 438, which is located at the midpoint of the thickness direction of the central portion of the base end side portion 41 and at the midpoint of the thickness direction of the front end of the neck 5.

[0065] Figure 9 This is a partially enlarged view showing the head 4 of the toothbrush 1 according to the third embodiment of the present invention. Figure 10A It means Figure 9 The cross-sectional view of the head 4 at section A3-A3 is shown. Figure 10B It means Figure 9 The cross-sectional view of section B3-B3 of head 4 is shown. Figure 9 , Figure 10A and Figure 10B As shown, the toothbrush 1 in the third embodiment, a variation of the second embodiment, is formed with a wall surface 402 and a stepped shape from the front end of the base-side portion 41 to the front end of the outer edge-side portion 43. The stepped shape between the front end of the base-side portion 41 and the front end of the outer edge-side portion 43 can be formed according to the number of bristle clusters 3 and the arrangement design of the bristle clusters 3, and the number of steps is not limited.

[0066] In addition, the 40-degree flocked surface can be as follows: Figure 8A , Figure 8B , Figure 10A and Figure 10B As shown, the wall surface 402 extends while bending or folding, preferably extending flat with a predetermined slope relative to either the base-side implant surface 401 or each of the outer-side implant surfaces 403. Furthermore, the predetermined slope is simply the degree to which it is easy to demold from the mold when shaping the head 4, neck 5, and gripping part 7; it is not particularly limited, but preferably 0 to 25 degrees. In this embodiment, the stepped bristle-planting surface 40 formed by the base-side implant surface 401, wall surface 402, and each of the outer-side implant surfaces 403 has two or one step. Since the number of steps can be adjusted according to the design of how the bristle bundles 3 are implanted, the number of steps is not limited. Furthermore, as... Figure 8A , Figure 8B , Figure 10A and Figure 10B As shown, the height differences, i.e., the step differences, formed by the basal side implantation surface 401, the wall surface 402, and the outer edge implantation surfaces 403 in the step-like structure can be different from each other, but are preferably equal. In addition, the step difference of each step is preferably 0.1 to 3 mm, and the total step difference of the head 4 is preferably 0.1 to 6 mm.

[0067] Multiple implantation holes 42 for implanting bristle bundles 3 are respectively formed on the basal implantation surface 401 and the outer edge implantation surface 403. The implantation holes 42 are orthogonal to the basal implantation surface 401 and the outer edge implantation surface 403, and preferably have a uniform depth. When the depth of the implantation holes 42 is uniform, the hair removal intensity of each bristle bundle 3 implanted on the basal implantation surface 401 and the outer edge implantation surface 403 becomes the same. In addition, the implantation holes 42 can be appropriately arranged according to the combination of bristle bundles 3 of different materials, the shape of the bristle tips of the bristle bundles 3, etc. They can be arranged at equal intervals along the length direction and the left and right width direction, or in a staggered manner. As long as the cleaning performance of the toothbrush 1 is achieved, the arrangement of the implantation holes 42 is not particularly limited.

[0068] Figure 11A It means Figure 6 A magnified view of the back of head 4 shown. Figure 11B It means Figure 11AThe image shows a side view of the head. Figure 11C It means Figure 11A The image shows a side view of the front end of the head. Figure 12A It means Figure 9 A magnified view of the back of head 4 shown. Figure 12B It means Figure 12A The image shows a side view of the head. Figure 12C It means Figure 12A The image shows a side view of the front end of the head. (See image.) Figures 11A to 11C and Figures 12A-12C As shown, the back surface 49 of the second and third embodiments is composed of a base-end side back surface 491 provided on the base-end side portion 41 and an outer-edge side back surface 493 provided on the outer-edge side portion 43. The base-end side back surface 491 preferably extends substantially flat from the neck 5, but may also have a step difference between it and the neck 5. The outer-edge side back surface 493 corresponds to the stepped shape of the hair implantation surface 40 and the bottom position of the hair implantation hole 42, and bends from the outer edge of the base-end side back surface 291 toward the end edge of the front end portion 431 of the uppermost stepped surface of the front end implantation surface 404 and the end edges of the side portions 433 of the uppermost stepped surface of the pair of side implantation surfaces 405, 405. The base-end side back surface 491 is provided continuously and substantially flat from the front end portion of the neck 5. Considering the cleanliness of the toothbrush 1 deep inside the mouth and the durability of the head 2 to the brushing pressure, the inclination of the outer edge portion 43 relative to the base end portion 41 is preferably set such that the angle H between the outer edge back surface 493 and the base end back surface 491 is 1 to 55 degrees.

[0069] Therefore, the toothbrush 1 of the first embodiment and the toothbrush 1 of the third embodiment can not only reduce the impact on the inner wall of the mouth when inserted deep into the mouth, but also reduce the collision of the head with the inner wall of the mouth when brushing in the vertical direction inside the mouth.

[0070] In addition, for the sake of convenience, in order to illustrate the structure of head 2 and head 4, for the sake of convenience, Figures 2-4B The bristle bundles 3 implanted in head 2 and head 4 are not shown in 7 to 10B, but bristle bundles 3 are actually implanted.

[0071] The embodiments of the present invention have been described above, but the present invention is not limited to such embodiments at all, and can of course be implemented in various ways without departing from the spirit of the present invention.

[0072] Explanation of reference numerals in the attached figures

[0073] 1. Toothbrush

[0074] 2. Head

[0075] 3. Bristle bundles

[0076] 4. Head

[0077] 5. Neck

[0078] 7. Grip section

[0079] 9 horizontal lines

[0080] 20 hair transplanted surface

[0081] 21. Basement side portion

[0082] 22 hair grafting holes

[0083] 23 Front Side

[0084] 23A Front Side Section

[0085] 29 Back

[0086] 30 bristle part

[0087] 40 hair transplanted surface

[0088] 41. Basement side portion

[0089] 42 hair grafting holes

[0090] 43 Outer edge portion

[0091] 49 Back

[0092] 201 Basement implantation surface

[0093] 202 wall

[0094] 203 Front-end implantation surface

[0095] 210 Virtual Surface

[0096] 230 Virtual Faces

[0097] 291 Basement side dorsal

[0098] 293 Front and back sides

[0099] 400 opening

[0100] 401 Basement side implantation surface

[0101] 402 wall

[0102] 403 Outer edge implantation surface

[0103] 404 front-end implantation surface

[0104] 405 Lateral implantation surface

[0105] 431 Front end

[0106] 432 Virtual Face

[0107] 433 Lateral section

[0108] 434 Virtual Face

[0109] 436 Virtual Faces

[0110] 438 Virtual Faces

[0111] 491 Basement side dorsal

[0112] 493 Outer edge side and back

[0113] B. Existing toothbrushes

[0114] G gums

[0115] H angle

[0116] T teeth

[0117] W refers to the inner wall of the oral cavity.

Claims

1. A toothbrush comprising: The head, wherein multiple bristle bundles are respectively planted at right angles to the bristle-planting surface; A neck that is connected to the head; The toothbrush, characterized by a grip portion connected to the neck, is further characterized by: The head is composed of a basal side portion and an anterior side portion, the basal side portion extending longitudinally from the anterior end of the neck, and the anterior side portion extending longitudinally from the anterior end of the basal side portion via a step. The front end portion is inclined toward the tip of the bristles extending from the bristle bundle.

2. The toothbrush as described in claim 1, characterized in that: The hair-grafting surface includes a base-side implantation surface disposed on the base-side portion and an anterior-side implantation surface disposed on the anterior-side portion. The basal side implantation surface and the anterior side implantation surface of the hair-grafting surface are parallel, and the hair-grafting surface is formed into a stepped shape by the basal side implantation surface and the anterior side implantation surface.

3. A toothbrush comprising: The head, wherein multiple bristle bundles are respectively planted at right angles to the bristle-planting surface; A neck that is connected to the head; The toothbrush, characterized by a grip portion connected to the neck, is further characterized by: The head is composed of a basal portion and an outer edge portion. The basal portion extends longitudinally from the front end of the neck, and the outer edge portion extends outwardly from the outer edge of the basal portion via a step. The outer edge portion is inclined toward the tip of the bristles extending from the bristle bundle.

4. The toothbrush as described in claim 3, characterized in that: The outer edge portion includes a front end portion extending along the length direction from the front end of the base end portion, and a pair of left and right side portions extending along the left and right width direction orthogonal to the length direction from the side of the base end portion.

5. The toothbrush as described in claim 3 or 4, characterized in that: The hair-grafting surface includes a base-side implantation surface disposed on the base-side portion and an outer-edge-side implantation surface disposed on the outer-edge-side portion. The hair-implanting surface is continuous from the base side portion to the outer edge side portion, and the hair-implanting surface is formed in a stepped shape by the base side implantation surface and the outer edge side implantation surface.

6. The toothbrush as described in claim 5, characterized in that: The front end of the outer edge portion and the pair of left and right side portions are connected to form a roughly U-shaped form when viewed from above.

Images