Toothbrush

Abstract

To provide a toothbrush that reduces collision of the toothbrush to an inner wall of an oral cavity when the toothbrush is inserted to the deep part of the oral cavity and improves operability in the inside of the oral cavity.SOLUTION: A toothbrush 1 according to the present invention includes: a head part 2 in which a plurality of brush hair bundles 3 are implanted at a right angle with respect to an implantation surface 20; a neck part 5 continuously installed in the head part 2; and a grip part 7 continuously installed in the neck part 2. The head part 2 includes a proximal end side portion 21 extending from a distal end of the neck part 5 in a longitudinal direction, and a distal end side portion 23 extending from a distal end of the proximal end side portion 21 in the longitudinal direction via a step. The distal end side portion 23 is inclined in a hair tip direction in which the brush hair bundles 3 extend.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a toothbrush that is easy to operate. [Background technology]

[0002] In recent years, toothbrushes have been proposed that have a thinner head to make it easier to reach the back of the oral cavity and improve maneuverability within the oral cavity (see, for example, Patent Document 1, etc.).

[0003] However, when cleaning the back teeth, the gap between the back teeth and the inner wall of the mouth is narrow, and with the above toothbrush, the edge of the head hits the inner wall, hindering the operability of the toothbrush. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-114423 A Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, the present invention provides a toothbrush that reduces collisions with the oral wall that occur when the head of the toothbrush is inserted deep into the oral cavity, thereby improving operability within the oral cavity. [Means for solving the problem]

[0006] The toothbrush of the present invention comprises a head portion in which multiple bristle bundles are each planted at right angles to the bristle planting surface, a neck portion connected to the head portion, and a handle portion connected to the neck portion, wherein the head portion is composed of a base end portion extending in the longitudinal direction from the tip of the neck portion, and a tip end portion extending in the longitudinal direction from the tip of the base end portion via a step, and the tip end portion is inclined in the bristles direction along which the bristle bundles extend.

[0007] In addition, the toothbrush of the present invention comprises a head portion in which multiple bristle bundles are each planted at right angles to the bristle planting surface, a neck portion connected to the head portion, and a handle portion connected to the neck portion, wherein the head portion is composed of a base end portion extending in the longitudinal direction from the tip of the neck portion, and an outer edge portion extending from the outer edge side of the base end portion via a step in an expansion direction spreading out around, and the outer edge portion is inclined in the direction of the bristles from which the bristle bundles extend.

[0008] This toothbrush reduces the risk of collision with the oral wall when the toothbrush is inserted deep into the oral cavity, improving the operability of the toothbrush. In addition, with this toothbrush, the bristle bundles are planted at right angles to the bristle planting surface, allowing the bristle bundles to be planted efficiently and reliably in the head portion.

[0009] It is also preferable that the outer edge portion includes a tip portion extending along the longitudinal direction from the tip of the base end portion, and a pair of left and right side portions extending from the sides of the base end portion along a left-right width direction perpendicular to the longitudinal direction.

[0010] Such a toothbrush not only reduces the impact of the toothbrush head on the inner walls of the oral cavity when inserted deep inside the oral cavity, but also reduces the impact of the head on the inner walls of the oral cavity when brushing in an up and down direction inside the oral cavity.

[0011] In addition, it is preferable that the hair implantation surface includes a base-side implantation surface provided in the base-side portion and a tip-side implantation surface provided in the tip-side portion, and that the base-side implantation surface and the tip-side implantation surface are parallel to each other and are formed in a stepped manner by the base-side implantation surface and the tip-side implantation surface.

[0012] Furthermore, it is preferable that the hair implantation surface includes a base end side implantation surface provided in the base end side portion and an outer edge side implantation surface provided in the outer edge side portion, and that the hair implantation surface extends from the base end side portion to the outer edge side portion and is formed in a stepped manner by the base end side implantation surface and the outer edge side implantation surface.

[0013] According to such a toothbrush, the process of attaching the tufts of brush bristles can be performed efficiently, and the tufts can be attached reliably to the head portion.

[0014] It is also preferable that the base end implantation surface and the tip end implantation surface are provided with a plurality of implantation holes having a uniform depth and into which the brush bristle bundles are implanted.

[0015] It is also preferable that the base end side implantation surface and the outer edge side implantation surface are provided with a plurality of implantation holes having a uniform depth and into which the brush bristle bundles are implanted.

[0016] With such a toothbrush, the bristle bundles are planted in bristle holes of the same depth, which makes it easy to mold the head to a uniform thickness and maintain the strength of the head.

[0017] It is also preferable that the outer edge portion is formed in a substantially U-shape in plan view by connecting the tip portion and the pair of side portions.

[0018] With this toothbrush, the head is strengthened by being formed in a roughly U-shape. Also, when using this toothbrush to rinse after cleaning the oral cavity, water flows out of the opening in the roughly U-shape, making it easy to remove toothpaste and dirt remaining on the toothbrush. Effect of the Invention

[0019] To provide a toothbrush which reduces collision with the inner wall of the oral cavity that occurs when the toothbrush is inserted deep inside the oral cavity and improves operability in the oral cavity. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing a toothbrush according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a partially enlarged view showing the head portion of the toothbrush shown in FIG. [Diagram 3] 3 is a cross-sectional view showing a cross section of the head part shown in FIG. 2 taken along line A1-A1. [Figure 4] 1 is a schematic diagram showing a flat line when planting a brush bristle bundle into a bristle planting hole. FIG. [Diagram 5] FIG. 2 is a schematic diagram showing (a) cleaning in the oral cavity with the toothbrush shown in FIG. 1 and (b) cleaning in the oral cavity with a conventional toothbrush. [Figure 6] FIG. 4 is a perspective view showing a toothbrush according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a partially enlarged view showing the head portion of the toothbrush shown in FIG. 6. [Figure 8] 8A is a cross-sectional view showing a cross section of the head part shown in FIG. 7 taken along line A2-A2, and FIG. 8B is a cross-sectional view showing a cross section of the head part shown in FIG. 7 taken along line B2-B2. [Figure 9] FIG. 11 is a locally enlarged view showing a head portion of a toothbrush according to a third embodiment of the present invention. [Figure 10] 10A is a cross-sectional view showing a cross section of the head part shown in FIG. 9 taken along line A3-A3, and FIG. 10B is a cross-sectional view showing a cross section of the head part shown in FIG. 9 taken along line B3-B3. [Figure 11] 7 is a locally enlarged view showing the rear surface of the head unit shown in FIG. 6. [Figure 12] 10 is a locally enlarged view showing the rear surface of the head unit shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] A toothbrush 1 according to a first embodiment of the present invention will be described. Fig. 1 is a perspective view showing the toothbrush 1 according to the first embodiment of the present invention. Fig. 2 is a locally enlarged view showing the head portion 2 of the toothbrush 1 shown in Fig. 1. Fig. 3 is a perspective view showing the cross section of the head portion shown in Fig. 2 taken along line A1-A1.

[0022] The toothbrush 1 according to the first embodiment shown in Figs. 1 to 3 includes a head portion 2 in which a plurality of brush bristle bundles 3 are planted in one direction relative to a bristle planting surface 20, a neck portion 5 connected to the head portion 2, and a grip portion 7 connected to the neck portion 5. The head portion 2, the neck portion 5, and the grip portion 7 can be formed using a commonly used synthetic resin without any particular restrictions. For example, it is preferable to use one or more resins selected from the group consisting of 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, polytrimethylene terephthalate, and polycyclohexane dimethylene terephthalate. Particularly preferred are polyacetal resin, polybutylene terephthalate resin, acrylonitrile butadiene styrene resin, acrylonitrile styrene resin, polycarbonate resin, and polycyclohexane dimethylene terephthalate.

[0023] It is also preferable that the head portion 2, the neck portion 5 and the grip portion 7 are integrally formed. The brush bristle bundle 3 is formed of a plurality of filaments made of a resin having appropriate elasticity, such as a polyamide resin such as nylon or aramid resin, a polyester resin such as polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate, a polyolefin resin such as polypropylene, a thermoplastic elastomer resin, or any other conventionally known thermoplastic resin filament.

[0024] 2, the head portion 2 is composed of a base portion 21 and a tip portion 23. The base portion 21 extends in the longitudinal direction from the tip of the neck portion 5. The tip portion 23 inclines from the tip of the base portion 21 toward the tips of the bristle bundles 3 while following the longitudinal direction. The term "inclined" here includes not only the case in which the tip portion 23 extends straight at a constant angle to the base portion 21 as in this example, but also cases in which part or the entire tip portion 23 extends in a curved manner while changing the angle, and other shapes.

[0025] The head portion 2 includes a bristle implantation surface 20 extending from a base end portion 21 to a tip end portion 23, and a 4 located on the opposite side of the bristle implantation surface 20. The bristle implantation surface 20 includes a base end implantation surface 201 provided in the base end portion 21 and a tip end implantation surface 203 provided in the tip end portion 23, and the base end implantation surface 201 and the tip end implantation surface 203 are perpendicular to the implantation direction of the brush bristle bundles 3. The bristle implantation surface 20 is formed in a stepped shape with multiple steps from the tip of the base end portion 21 to the tip of the tip end portion 23 by interposing a wall surface 202 extending in the implantation direction of the brush bristle bundles 3 between the base end implantation surface 201 and the tip end implantation surface 203. The inclination of the tip side portion 23 refers to the inclination of an imaginary plane 230 passing through the thickness direction middle position of the tip surface of the tip side portion 23 and the thickness direction middle position of the tip of the base side portion 21, relative to an imaginary plane 210 passing through the thickness direction middle position of the tip of the base side portion 21 and the thickness direction middle position of the tip of the neck portion 5. Note that, in this embodiment, the number of steps between the tip of the base side portion 21 and the tip of the tip side portion 23 is three, but the number of steps may be formed in a stepped shape depending on the number of brush bristle bundles 3 planted, etc., and is not limited thereto.

[0026] As shown in FIG. 3, the wall surface 202 of the bristle implantation surface 20 may extend while being curved or bent, and it is preferable that the bristle implantation surface 20 extends flatly while being given a predetermined gradient with respect to either the base end implantation surface 201 or each tip end implantation surface 203. The predetermined gradient may be such that the head portion 2, the neck portion 5, and the grip portion 7 can be easily released from the mold when they are molded, and is not particularly limited, but is preferably 0 degrees to 25 degrees. In this embodiment, the number of steps of the stepped bristle implantation surface 20 formed by the base end implantation surface 201, the wall surface 202, and each tip end implantation surface 203 is three, but the number of steps can be adjusted depending on the design of how the brush bristle bundle 3 is implanted, so the number of steps is not limited. As shown in FIG. 3, the bristle implantation surface 20 formed in a stepped shape by the base end implantation surface 201, the wall surface 202, and each tip end implantation surface 203 may have different height differences, i.e., the values ​​of the steps, and it is preferable that they are equal. Moreover, the step height per step is preferably 0.1 to 3 mm, and the total step height of the entire head portion 2 is preferably 0.1 to 6 mm.

[0027] A plurality of bristle implantation holes 22 into which the bristle bundles 3 are implanted are provided on the base-side implantation surface 201 and the tip-side implantation surface 203. The bristle implantation holes 22 are preferably perpendicular to the base-side implantation surface 201 and the tip-side implantation surface 203, and have a uniform depth. If the bristle implantation holes 22 have a uniform depth, the bristle bundles 3 implanted on the base-side implantation surface 201 and the tip-side implantation surface 203 will have approximately the same pluck strength.

[0028] 4 is a schematic diagram showing the flat wire 9 when the bristle bundle 3 is implanted in the bristle implantation hole 22. The bristle bundle 3 is pushed in from one direction along the bristle implantation hole 22 together with the flat wire 9, as shown in the distal end portion 23 of FIG. 4(a), so that the flat wire 9 acts as an anchor and the bristle bundle 3 is implanted in the bristle implantation hole 22. If the proximal implantation surface 201 and the distal implantation surface 203 for implanting the bristle bundle 3 are not perpendicular to the implantation direction in the distal end portion 23A, as shown in FIG. 4(b), one side of the flat wire 9 comes into contact with the bristle implantation hole 22 and tilts when the flat wire 9 is pushed in along the bristle implantation hole 22. If the bristle bundle 3 is implanted in the bristle implantation hole 22 with the flat wire 9 in a tilted position, the bristle bundle 3 is likely to come off. If the bristle bundle 3 were to be implanted in a direction perpendicular to the inclined surface of the tip portion 23A, the bristle bundle 3 would have to be implanted in at least two directions in the head portion 2, which would result in inefficiencies in the manufacturing process. Therefore, even if the flat wire 9 is pushed into the bristle implantation hole 22 opened along the implantation direction, the flat wire 9 does not tilt because the base end implantation surface 201 and the tip end implantation surface 203 are perpendicular to the implantation direction, and the bristle bundle 3 can be reliably implanted in the head portion 2.

[0029] Furthermore, the bristle holes 22 can be arranged as appropriate depending on the combination of bristle bundles 3 made of different materials, the bristle tip shapes of the bristle bundles 3, etc. The arrangement of the bristle holes 22 is not particularly limited as long as the toothbrush 1 can exhibit its cleaning properties, and they can be arranged at equal intervals in the longitudinal direction and the left and right width directions, or in a staggered pattern.

[0030] 1, the brush bristle bundles 3 are implanted in each bristle implantation hole 22 with different bristle heights depending on the base end implantation surface 201 and the tip end implantation surface 203, forming a brush section 30 with bristle tips that are approximately flush. The brush section 30 may be formed with bristle tips that have an undulating shape such as a mountain cut, or the brush bristle bundles 3 may all have the same bristle length to form a brush section 30 with bristle tips that have a shape similar to the stepped bristle implantation surface 20 formed by the base end implantation surface 201 and the tip end implantation surface 203. This is not limited to this as long as the operability of the toothbrush in the oral cavity is not impaired and cleaning performance is improved.

[0031] The back surface 29 is composed of a base end side back surface 291 provided in the base end side portion 21 and a tip end side back surface 293 provided in the tip end side portion 23. The base end side back surface 291 preferably extends substantially flat from the neck portion 5, and may have a step between the neck portion 5. The tip end side back surface 293 is bent from the tip of the base end side back surface 291 toward the end side of the tip end side portion 23 of the top step surface of the tip end side implantation surface 203, while corresponding to the step shape of the tufting surface 20 and the hole bottom position of the tufting hole 22. The degree of inclination of the tip end side portion 23 with respect to the base end side portion 21 is preferably set to 1 to 55 degrees as the angle H of the tip end side back surface 293 with respect to the base end side back surface 291, taking into consideration the cleaning ability of the toothbrush 1 in the back of the oral cavity and the durability of the head portion 2 against the brushing pressure.

[0032] 5 is a schematic diagram showing (a) cleaning in the oral cavity with the toothbrush 1 shown in FIG. 1 and (b) cleaning in the oral cavity with a conventional toothbrush B. When the conventional toothbrush B is inserted up to a tooth T close to the pharynx, as shown in FIG. 5(b), the tip collides with the oral cavity wall W. In contrast, as shown in FIG. 5(a), the toothbrush 1 according to the present invention is less likely to collide with the oral cavity wall W even when inserted up to a tooth T close to the pharynx, as with the conventional toothbrush B, because the tip-side back surface 293 of the tip-side portion 23 is inclined toward the bristle implantation surface 20.

[0033] In addition, it is preferable that the bristle tips of the bristle bundles 3 of the bristle part 30 are formed to be approximately flush by making the bristle length of the bristle bundles 3 planted in the base end portion 21 long and the bristle length of the bristle bundles 3 planted in the tip end portion 23 short. As a result, the tip of the toothbrush 1 narrows in the direction in which the bristle bundles 3 are planted, making it easier to insert the toothbrush 1 even if the space between the teeth T or gums G and the oral cavity wall W is narrow.

[0034] In addition, the bristle bundles 3 implanted on the distal implantation surface 203 are shorter in length than the bristle bundles 3 implanted on the proximal implantation surface 201, and therefore have a harder bristle stiffness than the bristle bundles 3 implanted on the proximal implantation surface 201, improving cleaning performance for the tooth surface. On the other hand, the bristle bundles 3 implanted on the proximal implantation surface 201 are longer in length than the bristle bundles 3 implanted on the distal implantation surface 203, and therefore have a softer bristle stiffness than the bristle bundles 3 implanted on the distal implantation surface 203, and are expected to have better interdental cleaning performance. In addition, the bristle bundles 3 implanted on the bristle implantation surface 20 are all aligned in one direction, and therefore the brushing pressure is uniformly distributed to the brush part 30, improving cleaning performance.

[0035] A toothbrush 1 according to a second embodiment of the present invention will be described. Fig. 6 is a perspective view showing a toothbrush 1 according to the second embodiment of the present invention. Fig. 7 is a locally enlarged view showing the head portion 4 of the toothbrush 1 shown in Fig. 6. Fig. 8 is a cross-sectional view showing the cross-sections of the A2-A2 line and the B2-B2 line of the head portion 4 shown in Fig. 7. Note that a description of the parts corresponding to the first embodiment will be omitted, and the description will focus on the technical features of the second embodiment that differ from the first embodiment.

[0036] The toothbrush 1 of the second embodiment shown in Figures 6 to 8, like the first embodiment, comprises a head portion 4 in which multiple brush bristle bundles 3 are each planted in one direction relative to a bristle planting surface 40, a neck portion 5 connected to the head portion 4, and a grip portion 7 connected to the neck portion 5.

[0037] 7, the head portion 4 is composed of a base end portion 41 and an outer edge portion 43. The base end portion 41 extends in the longitudinal direction from the tip of the neck portion 5. The outer edge portion 43 extends in an expanding direction from the outer edge side of the base end portion 41 and is inclined toward the bristles of the brush bristle bundles 3. The outer edge portion 43 includes a tip portion 431 extending in the longitudinal direction from the tip of the base end portion 41, and a pair of left and right side portions 433, 433 extending from the sides of the base end portion 41 in a left and right width direction perpendicular to the longitudinal direction.

[0038] Moreover, it is preferable that the outer edge portion 43 is formed in a substantially U-shape with the tip portion 431 and the pair of side portions 433, 433 connected to each other toward the neck portion 5. This prevents saliva and toothpaste that overflows during cleaning of the oral cavity from flowing out of the substantially U-shaped opening 400 and dripping to unexpected places. Also, the strength of the head portion 4 is ensured by forming the tip portion 431 and the pair of side portions 433, 433 connected to each other in a substantially U-shape.

[0039] The head portion 4 includes a bristle implantation surface 40 extending from the base end portion 41 to the outer edge 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 end implantation surface 401 provided in the base end portion 41, a tip end implantation surface 404 provided in the tip portion 431, and a lateral implantation surface 405 provided in the lateral portion 433, and the base end implantation surface 401, the tip end implantation surface 404, and the lateral implantation surface 405 are perpendicular to the implantation direction of the brush bristle bundles 3.

[0040] As shown in Fig. 7 and Fig. 8, the distal implantation surface 404 and the pair of lateral implantation surfaces 405, 405 are connected in the order of the lateral implantation surface 405, the distal implantation surface 404, and the lateral implantation surface 405 to form the peripheral implantation surface 403. The implantation surface 40 is formed in a two-step staircase shape from the tip of the proximal portion 41 to the tip of the peripheral portion 43 by interposing a wall surface 402 extending in the implantation direction of the brush bristle bundle 3 between the proximal implantation surface 401 and the peripheral implantation surface 403. The inclination of the distal end 431 of the peripheral portion 43 refers to the inclination of a virtual plane 432 passing through the thickness direction intermediate position of the distal end surface of the distal end 431 and the thickness direction intermediate position of the distal end of the proximal portion 41 with respect to a virtual plane 434 passing through the thickness direction intermediate position of the distal end of the proximal portion 41 and the thickness direction intermediate position of the distal end of the neck portion 5. In addition, the inclination of the lateral portion 433 of the outer edge portion 43 refers to the inclination of an imaginary plane 436 passing through the thicknesswise midpoint of the outer surface of the lateral portion 433 and the thicknesswise midpoint of the central portion of the base end portion 41, relative to an imaginary plane 438 passing through the thicknesswise midpoint of the central portion of the base end portion 41 and the thicknesswise midpoint of the tip of the neck portion 5.

[0041] Fig. 9 is a partially enlarged view showing the head part 4 of the toothbrush 1 according to the third embodiment of the present invention. Fig. 10 is a cross-sectional view showing the cross-sections of the head part 4 shown in Fig. 9 along the lines A3-A3 and B3-B3. As shown in Figs. 9 and 10, the toothbrush 1 according to the third embodiment, which is a modification of the second embodiment, is formed in a step-like shape with one step between the tip of the base end part 41 and the tip of the outer edge part 43 with the wall surface 402 interposed therebetween. The step-like shape may be formed between the tip of the base end part 41 and the tip of the outer edge part 43 depending on the number of bristle bundles 3 to be planted and the layout design of the bristle bundles 3, and the number of steps is not limited.

[0042] 8 and 10, the wall surface 402 of the bristle implantation surface 40 may extend while being curved or bent, and preferably extends flat with a predetermined inclination with respect to either the base end implantation surface 401 or each outer edge implantation surface 403. The predetermined inclination may be such that the head portion 4, the neck portion 5, and the gripping portion 7 can be easily released from the mold when they are molded, and is not particularly limited, but is preferably 0 degrees to 25 degrees. In this embodiment, the number of steps of the stepped bristle implantation surface 40 formed by the base end implantation surface 401, the wall surface 402, and each outer edge implantation surface 403 may be two or one, but the number of steps is not limited because the number of steps can be adjusted depending on the design of how the brush bristle bundles 3 are implanted. 8 and 10, the height difference, i.e., the step value of each step of the step-like implantation surface 40 formed by the base end side implantation surface 401, the wall surface 402, and each outer edge side implantation surface 403 may be different, but is preferably equal. The step value per step is preferably 0.1 to 3 mm, and the total step value of the entire head portion 4 is preferably 0.1 to 6 mm.

[0043] A plurality of bristle implantation holes 42 in which the bristle bundles 3 are implanted are formed on the base end implantation surface 401 and the outer edge implantation surface 403. The bristle implantation holes 42 are preferably perpendicular to the base end implantation surface 401 and the outer edge implantation surface 403, and have a uniform depth. If the depth of the bristle implantation holes 42 is uniform, the bristle bundles 3 implanted on the base end implantation surface 401 and the outer edge implantation surface 403 will have approximately the same pluck strength. The bristle implantation holes 42 can be appropriately arranged according to the combination of bristle bundles 3 made of different materials, the bristle tip shapes of the bristle bundles 3, etc. The bristle implantation holes 42 can be arranged at equal intervals in the longitudinal direction and the left and right width directions, or in a staggered pattern, and the arrangement of the bristle implantation holes 42 is not particularly limited as long as the cleaning performance of the toothbrush 1 can be exhibited.

[0044] FIG. 11 is a partially enlarged view showing the back surface of the head portion 4 shown in FIG. 6. FIG. 12 is a partially enlarged view showing the back surface of the head portion 4 shown in FIG. 9. As shown in FIG. 11 and FIG. 9, the back surface 49 according to the second and third embodiments is composed of a base end side back surface 491 provided in the base end side portion 41 and an outer edge side back surface 493 provided in the outer edge side portion 43. The base end side back surface 491 preferably extends substantially flat from the neck portion 5, and may have a step between the base end side back surface 491 and the neck portion 5. The outer edge side back surface 493 is bent from the outer edge of the base end side back surface 291 toward the end edge of the tip portion 431 of the top surface of the tip end side implantation surface 404 and each end edge of the side portion 433 of the top surface of the pair of side side implantation surfaces 405, 405, while corresponding to the step shape of the hair implantation surface 40 and the hole bottom position of the hair implantation hole 42. The base end side back surface 491 is provided substantially flat and continues from the tip of the neck portion 5. The degree of inclination of the outer edge side portion 43 with respect to the base end side portion 41 is preferably set at an angle H of the outer edge side back surface 493 with respect to the base end side back surface 491, which is 1 to 55 degrees, in consideration of the ability of the toothbrush 1 to clean the inner part of the oral cavity and the durability of the head portion 2 against brushing pressure.

[0045] As a result, the toothbrush 1 of the first embodiment and the toothbrush 1 of the third embodiment not only reduce impact with the inner walls of the oral cavity when inserted deep inside the oral cavity, but also reduce impact of the head portion on the inner walls of the oral cavity when brushing up and down inside the oral cavity.

[0046] In addition, for the sake of convenience, in order to show the configuration of head portion 2 and head portion 4, Figures 2 to 4 and 7 to 10 do not show the brush bristle bundles 3 attached to head portion 2 and head portion 4, but in reality, brush bristle bundles 3 are attached.

[0047] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and it is of course possible to carry out the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0048] 1 Toothbrush 2 Head section 3 Brush bristles 4 Head section 5 Neck 7 Grip 9. Flat Line 20 Flocked surface 21 Proximal part 22 Hair transplant hole 23 Tip side part 23A Tip side part 29 Back 30 Brush section 40 Flocked surface 41 Proximal part 42 Hair transplant hole 43 Outer edge part 49 Back 201 Base end implant surface 202 Wall 203 Tip implant surface 210 Virtual Surface 230 Virtual Surface 291 Proximal Dorsal Surface 293 Tip side back 400 opening 401 Base end implant surface 402 Wall 403 Outer edge planting surface 404 Tip implant surface 405 Lateral implant surface 431 Tip 432 Virtual Surface 433 Lateral part 434 Virtual Surface 436 Virtual Surface 438 Virtual Surface 491 Base end back 493 Outer back B. Conventional toothbrush G. Gums H angle T Teeth W Inner oral wall

Claims

1. A toothbrush comprising a head portion in which a plurality of brush bristle bundles are respectively planted at right angles to a bristle planting surface, a neck portion connected to the head portion, and a grip portion connected to the neck portion, The head portion is composed of a base end portion extending in a longitudinal direction from a tip of the neck portion, and a tip end portion extending in a longitudinal direction from a tip of the base end portion via a step, The tip portion is inclined in a direction toward the ends of the bristles of the brush.

2. The implantation surface includes a base end implantation surface provided in the base end portion and a tip end implantation surface provided in the tip end portion, The toothbrush according to claim 1 , wherein the base end implantation surface and the tip end implantation surface are parallel to each other and are formed in a stepped shape by the base end implantation surface and the tip end implantation surface.

3. A toothbrush comprising a head portion in which a plurality of brush bristle bundles are respectively planted at right angles to a bristle planting surface, a neck portion connected to the head portion, and a grip portion connected to the neck portion, The head portion is composed of a base end portion extending in a longitudinal direction from the tip of the neck portion, and an outer edge portion extending in an expansion direction from the outer edge side of the base end portion via a step, The outer edge portion is inclined in a direction toward the bristle tips of the bristle bundles.

4. The toothbrush of claim 3, wherein the outer edge portion includes a tip portion extending in a longitudinal direction from the tip of the base end portion, and a pair of left and right side portions extending in a left-right width direction perpendicular to the longitudinal direction from the sides of the base end portion.

5. The implantation surface includes a base end side implantation surface provided in the base end side portion and an outer edge side implantation surface provided in the outer edge side portion, 5. The toothbrush according to claim 3, wherein the bristle implantation surface is continuous from the base end portion to the outer edge portion, and is formed in a stepped shape by the base end implantation surface and the outer edge implantation surface.

6. The toothbrush according to claim 5 , wherein the outer edge portion is formed into a substantially U-shape in a plan view by connecting the tip portion and the pair of left and right side portions.

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