JP2020028643A - toothbrush - Google Patents

Abstract

To provide a toothbrush for facilitating insertion of bristles to periodontal pockets and, at the same time, sufficiently obtaining a cleaning effect on tooth surfaces and occlusal surfaces.SOLUTION: A toothbrush includes: a bar shape handle part; a plate-like head part 2 connected to a tip end part of the handle part in an axial direction; and multiple bristle bundles arranged in one surface of the head part. The multiple bristle bundles include: at least one line of multiple first bristle bundles 31 aligned in an axial direction; at least two lines of multiple second bristle bundles 32 arranged to sandwich the multiple first bristle bundles between the second bristle bundles and aligned in an axial direction; and at least two lines of multiple third bristle bundles 33 aligned in an axial direction. A height from the head part is formed to be higher in order of the third bristle bundles, the second bristle bundles, and the first bristle bundles. Tip ends of respective bristles in the first bristle bundles are formed to be thinner in a tapered shape. Tip ends of at least a part of bristles in the second and third bristle bundles are formed to be flat or hemispherical.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a toothbrush.

  Periodontal disease is also said to be a national disease of the Japanese, and it is reported that about 80% of those in their 30s have evidence of periodontal disease. It is known that periodontal disease is the most frequent cause of tooth loss. Plaque control using a toothbrush is important for self-care to prevent periodontal disease.

  Against this background, various toothbrushes have been proposed for enhancing the periodontal pocket cleaning effect. For example, the toothbrush of Patent Literature 1 employs hair with a thin tip that can be easily inserted into a periodontal pocket, and it has been reported that such fine hair is effective for cleaning a periodontal pocket. ing.

JP 2001-346630A

  However, hair having a thin tip has a problem that the plaque scraping force is weaker than that of a hair having a flat tip or a hemispherical tip, and cleaning efficiency on a tooth surface or an occlusal surface is low. An object of the present invention is to provide a toothbrush capable of solving such a problem, in which hair can be easily inserted into a periodontal pocket, and at the same time, a sufficient cleaning effect of a tooth surface and an occlusal surface can be obtained. .

  The toothbrush according to the present invention has a rod-shaped handle portion, a plate-shaped head portion connected to an axial end of the handle portion, and a plurality of bristle bundles provided on one surface of the head portion. The plurality of hair bundles are arranged in the axial direction, and at least a part of the plurality of first hair bundles are arranged in at least one row in a width direction orthogonal to the axial direction. A plurality of second hair bundles arranged in at least two rows arranged along the axial direction, and at least a portion in the width direction sandwich the plurality of second hair bundles so as to sandwich the plurality of second hair bundles. At least two rows of third hair bundles arranged on the opposite side to the first hair bundle and arranged along the axial direction, wherein the third hair bundle, the second hair bundle, and the first hair are provided. In the order of the bundle, the tip portion from the head portion to the tip portion is formed so as to have a higher height, and the The tip of each hair of one hair bundle is formed so as to be tapered, and the tip of at least part of the hairs of the second and third hair bundles is formed flat or hemispherical. .

  According to this configuration, the tips of the plurality of first bristle bundles having the highest tips are formed in a tapered shape, so that this portion can be easily inserted into the periodontal pocket, and plaque is scraped. Easy to take. Further, the height of the tip of the second hair bundle and the third hair bundle is adjusted so as to sandwich the first hair bundle so as to have a mountain shape as a whole, so that the first hair bundle is inserted into the periodontal pocket. In this state, if the handle is tilted around the axis, the second bristle bundle and the third bristle bundle can be easily brought into contact with the tooth surface and gums. When brushing is performed in this state, at least a part of the tip of the second hair bundle and the third hair bundle is formed in a flat or hemispherical shape, so that force is easily transmitted to the tooth surface and the gums. Therefore, not only the periodontal pocket but also the cleaning power for the tooth surface and the gums can be enhanced.

  In the above-mentioned toothbrush, the tip of each bristle of all the second and third bristle bundles can be formed flat or hemispherical.

  According to this configuration, the force can be easily transmitted from the entire second and third bristle bundles to the tooth surface and the gums. Therefore, the cleaning power for tooth surfaces and gums can be further improved.

  In the toothbrush, on the tip side in the axial direction, the third bristle bundle may be arranged in a line from the leading end side toward the handle portion side, following the first bristle bundle.

  According to this configuration, on the tip side of the toothbrush, the third bristle bundle lower than the second bristle bundle is arranged following the first bristle bundle. The length of the portion higher than the hair bundle can be increased. Thereby, the degree of freedom of the movement of the first bristle bundle is increased, and, for example, it becomes easy to insert the first bristle bundle on the distal end side into the periodontal pocket of the back teeth. Therefore, the cleaning power for the periodontal pocket in the portion where the brushing is not easy, such as the back teeth, can be enhanced.

  In the above-mentioned toothbrush, each bristle of the first bristle bundle has one end formed in a tapered shape and the other end formed in a flat shape or a hemispherical shape. It is configured to be fixed to the head portion, and in each of the first bristle bundles, the height of the one end portion of each hair from the head portion is higher than the height of the other end portion from the head portion. , And one end of each hair constitutes a tip of the hair of the first hair bundle.

  According to this configuration, each hair constituting the first hair bundle is folded in two, and only one end is formed in a tapered shape. Therefore, the number of tapered portions in each first bristle bundle can be reduced, thereby facilitating insertion of bristle into the periodontal pocket.

  In the toothbrush, the height of the other end of each bristle from the head portion in each of the first bristle bundles is lower than the height of the bristles of each second bristle bundle from the head portion. It can be configured as follows.

  Thereby, since the height of the other end of the first bristle bundle is lower than the height of the bristle of the second bristle bundle, it is possible to suppress the other end from hindering the movement of the one bristle. The degree of freedom of movement can be increased. Accordingly, it is possible to easily insert the tapered one end into the periodontal pocket.

  In the above-mentioned toothbrush, the difference between the height of the other end of the hairs of each first bristle from the head and the height of the hairs of each second bristle from the head is 2.0 mm. Within.

  As a result, the height of the other end of the first hair bundle and the height of the hairs of the second hair bundle are equivalent to each other. The other end of one bristle bundle can also be brought into contact, and the cleaning effect of this portion can be further enhanced.

  In the toothbrush, the difference between the tip height of the first bristle bundle and the tip height of the second bristle bundle may be 1.0 mm or more.

  This increases the length of the portion of the first hair bundle higher than the second hair bundle, so that the degree of freedom of movement of the first hair bundle on the tip end side can be further increased. Therefore, the first bristle bundle can be more easily inserted into the periodontal pocket.

  In the toothbrush, the length of the head portion in the width direction may be 13 mm or more.

  Thus, the number of rows of hair bundles that can be arranged in the head portion in the width direction can be increased, and a large area can be brushed at a time.

  In the above-described toothbrush, the tip of the head portion may be formed in a triangular shape having a pair of side edges such that the width becomes narrower toward the tip.

  This makes it easier to insert the tip of the head into the back of the oral cavity, such as the back teeth, and can easily brush the back teeth.

  In the toothbrush, the first, second, and third bristle bundles can have the same bundle diameter.

  ADVANTAGE OF THE INVENTION According to the toothbrush which concerns on this invention, insertion of a bristle into a periodontal pocket is easy and at the same time, the cleaning effect of a tooth surface and an occlusal surface can be fully acquired.

It is a top view of a toothbrush concerning one embodiment of the present invention. It is a side view of FIG. It is an enlarged view of FIG. FIG. 4 is a side view of FIG. 3. FIG. 4 is a front view of FIG. 3. It is the schematic for demonstrating the hair which comprises each hair bundle. FIG. 2 is a diagram illustrating use of the toothbrush of FIG. 1.

  Hereinafter, an embodiment of a toothbrush according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the toothbrush according to the present embodiment, and FIG. 2 is a side view of FIG. In the following, for convenience of description, the description will be made based on the directions in the drawings in the drawings. However, the present invention is not limited by the definition of this direction.

<1. Outline of toothbrush>
As shown in FIGS. 1 and 2, the toothbrush according to the present embodiment includes a handle portion 1 extending in a rod shape, and a plate-shaped head portion 2 integrally attached to an axial end of the handle portion 1. , A plurality of hair bundles 3 attached to the upper surface of the head unit 2. Hereinafter, each member will be described in detail.

<1-1. Handle part>
The handle 1 includes a rod-shaped base 11 that can be gripped by hand, and a connecting part 12 that connects the base 11 and the head 2, and these are integrally formed. A mounting portion 13 for placing a finger is formed on an upper surface and a lower surface of the distal end portion of the base portion 11, and unevenness for preventing slipping, resin, rubber, and the like are arranged on the mounting portion 13. Can be.

  The connecting portion 12 is formed in a rod shape smaller than the base portion 11.

<1-2. Head>
Next, the head section 2 will be described with reference to FIG. FIG. 3 is an enlarged view of FIG. As shown in FIG. 3, the head part 2 is formed in a plate shape, and is formed in an octagonal shape that is long in the axial direction in plan view. Here, for convenience of description, the outline of the head unit 2 in plan view is defined by the tip side 21, the first right side 22, the first left side 23, the second right side 24, the second left side 25, and the third right side 26. , And the third left side 27.

  The tip side 21 is the shortest end of the head portion 2 and extends in the left-right direction. A first right side 22 and a first left side 23 are connected to both sides of the front end 21, respectively, and extend away from the front end 21 so as to move away from each other. The second right side 24 and the second left side 25 are connected to the rear ends of the first right side 22 and the first left side 23, respectively, and extend in the front-rear direction in parallel with each other. The third right side 26 and the third left side 27 are connected to the rear ends of the second right side 24 and the second left side 25, respectively. These extend toward each other toward the rear and are connected to both sides of the connecting portion 12 of the handle portion 1.

  The width W of the head portion 2 is not particularly limited as long as there is no problem in handling in the oral cavity, but is, for example, preferably 10 mm to 20 mm, more preferably 13 mm to 17 mm, and particularly preferably 14 mm to 16 mm. As the width W of the head portion 2 increases, the number of rows of the hair bundles on which the hair can be implanted increases, and thus, a large area can be cleaned at a time. For example, on the upper surface of the head portion 2, five or more rows, preferably six or more rows of hair bundles can be arranged.

  Further, on the upper surface of the head portion 2, a plurality of flocked holes 28 in which the respective hair bundles 3 to be described later are transplanted are formed (see FIG. 6).

  The handle 1 and the head 2 are integrally formed of a resin material such as plastic.

<1-3. Hair bundle>
Next, the hair bundle 3 will be described with reference to FIGS. 4 is a side view of FIG. 3, FIG. 5 is a front view of FIG. 3, and FIG. 6 is a schematic diagram for explaining the hairs constituting each hair bundle. In the present embodiment, a plurality of types of hair bundles, that is, a plurality of first hair bundles 31, a second hair bundle 32, and a third hair bundle 33 are respectively provided so as to form rows in the front-rear direction. Are located. In FIGS. 3 to 5, the hair bundles are colored for each type of hair for convenience of description, but for the sake of explanation, all the hair bundles can be made the same color such as white. The bristle bundles shown in FIGS. 3 to 5 and 7 are merely schematic diagrams, and a state in which a plurality of bristle bundles is shown as a rectangular bristle bundle.

<1-3-1. 1st hair bundle>
As shown in FIGS. 3 to 5, approximately two rows constituted by the first hair bundles 31 are provided at the center in the width direction of the head portion 2, and each row is arranged from the vicinity of the tip side 21 to the handle portion. 1 extends to the vicinity of the connecting portion 12. However, only the third hair bundle 31a from the tip, and the last part and the second hair bundle 31b and 31c from the last part are in a line.

  As shown in the enlarged view of FIG. 5 and FIG. 6, the plurality of bristles 310 constituting each first bristle bundle 31 are formed in a tapered shape in which one end 311 becomes thinner toward the tip, and the other end 312 , Flat or on a hemisphere. The plurality of bristles 310 thus formed are bundled and folded in two. Then, a known flat wire 4 having a flat plate shape is attached to the fold portion, and the fold portion is driven into the flocking hole 28 of the head 2 together with the flat wire 4. Thereby, the first hair bundle 31 is fixed to the head unit 2.

  At this time, the first bristle bundle 31 is fixed such that one end 311 of each bristle 310 is higher than the other end 312. Therefore, the highest end of the first hair bundle 31 is formed by the tapered one end 311, and the flat other end 312 is disposed at a lower position. Here, the height L1 (tip height) of the first bristle bundle 31 is the height from the upper surface of the head portion 2 to the tip of the tapered one end 311 of each bristle 310. The height L1 of the first hair bundle 31 can be, for example, 10 to 15 mm, preferably 12 to 15 mm, and most preferably 13 to 14 mm. When the height of the hairs 310 included in each first hair bundle 31 varies, the average of the heights of the hairs 310 is defined as the height L1 of the first hair bundle 31. This applies to the second hair bundle 32 and the third hair bundle 33 described later. Further, the number of hairs 310 included in each first hair bundle 31 is not particularly limited, but is preferably, for example, 20 to 60, and more preferably 30 to 50. Although the number of hairs included in the second hair bundle 32 and the third hair bundle 33 is not particularly limited, for example, the number is preferably 10 to 50, and more preferably 20 to 40. Here, the number of hairs is the number of hairs after the hairs are bent and implanted in the head portion 2 as described above, that is, the number of hairs protruding from the head portion 2. This applies to other descriptions in this specification.

<1-3-2. Second hair bundle>
Next, the second hair bundle 32 will be described. As shown in FIG. 3, the rows constituted by the second hair bundles 32 are arranged on both sides of the first hair bundle 31, one by one. That is, they are arranged so as to sandwich the first hair bundle 31. The second hair bundle 32 on the most distal end side is arranged so as to sandwich the first hair bundle 31a in the third row from the front. And it arrange | positions also to the both sides of the 1st hair bundle 31c of the tail. As described above, since the first hair bundle 31 has the third 31a and the last two 31b, 31c in one row, the second hair bundle 32 sandwiching the first hair bundle 31 has a width near the center in the front-rear direction. It is arranged so as to bulge outward in the direction.

  As shown in FIG. 6, the plurality of hairs 320 constituting the second hair bundle 32 have both ends formed flat or on a hemisphere. The plurality of bristles 320 thus formed are bundled and folded in two. Then, similarly to the first hair bundle 31, the hair 4 is driven into the flocked hole 28 of the head 2 together with the flat wire 4. However, each hair 320 constituting the second hair bundle 32 is evenly folded in two and fixed to the head unit 2 so that both ends are at the same height. Here, the height L <b> 2 (tip height) of the second bristle bundle 32 is the height from the upper surface of the head 2 to the tips of both ends of each bristle 320.

  The height L2 of the second bristle bundle 32 is lower than the first bristle bundle 31 and can be, for example, 8 to 13 mm, preferably 10 to 13 mm, and most preferably 11 to 12 mm. The height difference (the difference between L1 and L2) from the first bristle bundle 31 is preferably 1 to 4 mm, more preferably 2 to 3 mm, and 1.5 to 2.5 mm. Most preferred.

  The height L4 of the other end 312 of each hair 310 of the first hair bundle 31 is preferably within 2.0 mm from the height L2 of the second hair bundle 32, and is preferably within 1.5 mm. More preferably, it is particularly preferably within 1.2 mm. In particular, it is preferable that the second hair bundle 32 is lower than the second hair bundle 32 within a height range of 2.0 mm or less from the height L2.

<1-3-3. Third Bundle>
Next, the third hair bundle 33 will be described. As shown in FIG. 3, the rows formed by the third hair bundles 33 are arranged on each side of the second hair bundle 32, one by one. That is, they are arranged so as to sandwich the second hair bundle 32. However, the third hair bundle 33a at the most distal end is arranged so as to sandwich the first hair bundle 31 in the second two rows from the front. Therefore, as shown in FIG. 4, in a side view, the third hair bundle 33 a is arranged from the tip, following the first hair bundle 31, and the second hair bundle 32 is arranged following this. It has become.

  The third bristle bundle 33 is further disposed on both sides of the second bristle bundle 32 from there, to the both sides of the second second bristle bundle 32 from the rear end. Therefore, similarly to the second hair bundle 32, the third hair bundle 33 is arranged so that the vicinity of the center in the front-rear direction swells outward in the width direction.

  As described above, the first to third bristle bundles 31 to 33 have the top end in two rows of the first bristle bundles 31. As shown in FIG. Visually, they are arranged in a generally triangular shape. In the vicinity of the rear end of the head portion 2, the rearmost hair bundles 3 are arranged in three rows. That is, three hair bundles of the first hair bundle 31 and the two second hair bundles 32 sandwiching the first hair bundle 31 are arranged. The plurality of bristle bundles 3 arranged at the rear end are arranged substantially in a trapezoidal shape in plan view in conformity with the shape near the front end of the head 2.

  As shown in FIG. 6, the plurality of bristles 330 constituting the third bristle bundle 33 have both ends formed flat or hemispherical like the second bristle bundle 32. Then, like the second bristle bundle 32, it is evenly folded into two and fixed to the head unit 2 so that both ends are at the same height. Here, the height L3 (tip height) of the third bristle bundle 33 is a height from the upper surface of the head portion 2 to the tips of both ends of each bristle 330.

  The height L3 of the third bristle bundle 33 is lower than that of the second bristle bundle 32, and may be, for example, 7 to 12 mm, preferably 8 to 11 mm, and most preferably 9 to 10 mm. The height difference (the difference between L1 and L3) from the first hair bundle 31 is, for example, preferably 3 mm or more, and most preferably 4 to 6 mm.

As described above, the first bristle bundle 31, the second bristle bundle 32, and the third bristle bundle 33 are formed so that their heights decrease in this order, and as a result, as shown in FIG. In a front view, these hair bundles 3 are arranged so as to form a mountain shape. Table 1 below shows two examples of the height of each of the hair bundles 31 to 33. However, this is merely an example, and other heights can be used.

  The material constituting the hair of each hair bundle 31 is not particularly limited, and may be, for example, a saturated polyester resin, nylon, or the like. In addition, the diameters of the hairs 310, 320, and 330 of each of the hair bundles 31 to 33 and the bundle diameter of each of the hair bundles 31 to 33 can be substantially the same. The diameter of each bristle 310, 320, 330 can be, for example, 0.12 to 0.25 mm. On the other hand, the bundle diameter of each of the hair bundles 31 to 33 can be, for example, 0.5 to 2 mm. The shape of the flocking hole 28 of each hair bundle is not particularly limited, and examples thereof include a perfect circle, an ellipse, and a polygon.

<2. How to use toothbrush>
Next, a method of using the toothbrush formed as described above will be described with reference to FIG. The height L1 of the first hair bundle 31 is the highest, and is arranged at the center in the width direction. Since the distal end of the first bristle bundle 31 is formed in a tapered shape, the bristle bundle 3 is brought into contact with the teeth so that this portion is inserted into the periodontal pocket 51. For this purpose, as shown in FIG. 7, the handle portion 1 is rotated about an axis to make the hair bundle 3 in an inclined state, and then brushing is performed by bringing the hair bundle 3 into contact with the teeth. At this time, since the bristle bundle 3 is arranged in a mountain shape in a front view, if the first bristle bundle 31 is arranged to be inserted into the periodontal pocket 51, one of the second and third bristle bundles in the width direction is arranged. 32 and 33 contact the tooth surface. Therefore, cleaning of the tooth surface 52 can be performed together with cleaning of the periodontal pocket 51. When the occlusal surface 53 is to be cleaned, the head portion 2 may be parallel to the occlusal surface 53 and brushing may be performed while pressing the hair bundle 3.

<3. Features>
According to the toothbrush according to the embodiment, the following effects can be obtained.
(1) Since the tip of the highest first hair bundle 31 is formed in a tapered shape, this portion can be easily inserted into the periodontal pocket 51, and plaque and dirt can be easily scraped out. . The height of the second hair bundle 32 and the height of the third hair bundle 33 are adjusted so as to sandwich the first hair bundle 31 so as to form a mountain shape as a whole. When the handle portion 1 is tilted around the axis in the state of being inserted into the second bundle, the second bristle bundle 32 and the third bristle bundle 33 can be easily brought into contact with the tooth surface 52. When brushing is performed in this state, the distal ends of the second bristle bundle 32 and the third bristle bundle 33 are formed in a flat or hemispherical shape, so that force is easily transmitted to the tooth surface 52. Also, when brushing the occlusal surface 53, the force is easily transmitted by the second hair bundle 32 and the third hair bundle 33. Therefore, the cleaning force for not only the periodontal pocket 51 but also the tooth surface 52 and the occlusal surface 53 can be increased.

(2) On the distal end side of the head portion 2, from the distal end side toward the handle portion 1, the third bristle bundle 33a is arranged in a row following the first bristle bundle 31. That is, since the third hair bundle 33 lower than the second hair bundle 32 is arranged following the first hair bundle 31, in this portion, the first hair bundle 31 is higher than the other hair bundles. The length of the part can be increased. Accordingly, the degree of freedom of movement of the first hair bundle 31 is increased, and, for example, the first hair bundle 31 on the distal end side (front side) is easily inserted into the periodontal pocket 51 of the back tooth. Therefore, the cleaning power for the periodontal pocket 51 in the portion where the brushing is not easy, such as the back teeth, can be enhanced.

(3) Although the number of hairs included in each hair bundle is not particularly limited, for example, the first hair bundle 31 includes 20 to 60 hairs, and the second hair bundle 32 and the third hair bundle 33 Contains 10 to 50 hairs. In the second hair bundle 32 and the third hair bundle 33, the hairs 320 and 330 are evenly folded into two so that both ends are aligned. Therefore, for example, if each hair bundle 32, 33 contains 10 hairs, these are folded in two, so that the ends of the 20 hairs are divided into the second and third hair bundles 32. , 33 are constituted.

  On the other hand, the bristles 310 of the first bristle bundle 31 are also folded in two, but the height of the tapered one end 311 is increased, and this one end 311 constitutes the tip of the first bristle bundle 31. Like that. Therefore, the number of hairs constituting the tip of the first hair bundle 31 is smaller than that of the second and third hair bundles 32 and 33. Therefore, since the number of hairs formed in a tapered shape is small, the hairs can be easily inserted into the periodontal pocket 51.

(4) Since the height L4 of the other end 312 of the first bristle bundle 31 is adjusted to be substantially the same as the height of the second bristle bundle 32, the second bristle is formed on the tooth surface 52. The other end 312 of the first hair bundle 31 can also be brought into contact with a portion substantially the same as the portion with which the bundle 32 comes into contact. In particular, one end 311 of the first bristle bundle 31 is formed in a tapered shape and is soft, so that when brushing the tooth surface 52, it does not hinder the brushing by the other end 312 and the second bristle bundle 32. . In addition, since the other end 312 and the at least two rows of the second bristle bundles 32 can perform brushing with a wide width, the tooth surface 52 can be brushed firmly within the same range as a normal toothbrush. Therefore, the cleaning effect can be further enhanced.

<4. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to said Embodiment, A various change is possible unless it deviates from the meaning. The following modifications can be combined as appropriate.

<4-1>
In the above-described embodiment, the hair bundles 31 to 33 having three kinds of heights are used. However, the present invention is not limited to this, and four or more kinds of hair bundles having different heights can be used. Also in this case, it is preferable that the height of the hair bundle is adjusted to be lower toward the outer side in the width direction so as to form a mountain shape as a whole in a front view. However, as described in the above embodiment, a third hair bundle 33 or a hair bundle lower than the third hair bundle 32 can be arranged instead of the second hair bundle 32 adjacent to the first hair bundle 31. That is, if it is a part, the hair bundles do not have to be arranged in order of height in the width direction.

<4-2>
The number of the hair bundles 3 is not particularly limited. In the above embodiment, the first bristle bundles are provided in two rows, the second bristle bundles 32 are provided on both sides thereof in one row, and the third bristle bundles 33 are provided on both sides thereof in one row. However, this is an example. The number of rows of the hair bundles 31 to 33 can be changed as appropriate.

<4-3>
The number of hairs constituting each of the hair bundles 31 to 33, the diameter of the hair, and the bundle diameter of the hair bundle are not particularly limited, and may be all the same as in the above embodiment, or may be different. it can. In particular, if the bundle diameter of all hair bundles is the same, force can be uniformly applied to each hair bundle during brushing, and furthermore, the bundle diameter can be easily adjusted at the time of manufacturing, which contributes to cost reduction. I do. In addition, at least one of the hair bundles 31 to 33 may be colored so that the difference in height can be recognized.

<4-4>
The method of implanting the hair bundles 31 to 33 is not particularly limited. In the above embodiment, the bristles 310 of the first bristle bundle 31 are bent such that one end of the tapered shape is raised. However, the position of the fold is not particularly limited as long as the tapered portion is not obstructed. In addition, the other end 312 may be formed in a shape other than a flat shape or a hemispherical shape, for example, a tapered shape.

  Regarding the second and third hair bundles 32 and 33, the position of the fold is not particularly limited, and the heights at both ends may be different. Further, a part of the ends of the bristles of the second and third bristle bundles 32 and 33 may be formed in a shape other than a flat shape or a hemisphere, for example, in a tapered shape.

<4-5>
The shapes of the handle portion 1 and the head portion 2 are not particularly limited, and can be appropriately changed. For example, the shape (particularly, planar shape) of the head portion 2 can be appropriately changed according to the desired arrangement of the hair bundle.

DESCRIPTION OF SYMBOLS 1 Handle part 2 Head part 3 Hair bundle 31 First hair bundle 310 Hair 311 One end 312 Other end 32 Second hair bundle 320 Hair 33 Third hair bundle 330 Hair

Claims (8)

A rod-shaped handle,
A plate-shaped head connected to an axial end of the handle,
A plurality of hair bundles provided on one surface of the head portion,
With
The plurality of hair bundles,
At least one row of a plurality of first hair bundles arranged in the axial direction;
In a width direction orthogonal to the axial direction, at least a part is arranged so as to sandwich the plurality of first hair bundles, and is arranged along the axial direction, and at least two rows of a plurality of second hair bundles,
In the width direction, at least a part of the plurality of second hair bundles is disposed on the opposite side to the plurality of first hair bundles, and is arranged along the axial direction. A third hair bundle,
With
The third bristle bundle, the second bristle bundle, and the first bristle bundle are formed in such a manner that the height of the tip from the head to the tip is higher,
The tip of each hair of the first hair bundle is formed so as to be tapered,
A toothbrush in which at least a part of hairs of the second and third bristle bundles have a flat or hemispherical tip.   2. The toothbrush according to claim 1, wherein the tips of all the bristles of the second and third bristle bundles are formed flat or hemispherical. 3.   3. The axial bundle according to claim 1, wherein the third bristle bundle is arranged following the first bristle bundle from the distal end side toward the handle portion side. 4. The toothbrush as described. Each bristle of the first bristle bundle has one end formed into a tapered shape and the other end formed into a flat shape or a hemispherical shape,
The hair is folded in two, and a fold portion is configured to be fixed to the head portion,
In each of the first bristle bundles, the height of the one end portion of each hair from the head portion is configured to be higher than the height of the other end portion from the head portion,
The toothbrush according to any one of claims 1 to 3, wherein one end of each bristle constitutes a tip of the bristle of the first bristle bundle.   In each of the first bristle bundles, the height of the other end of each bristle from the head portion is configured to be lower than the height of the bristles of each second bristle bundle from the head portion. The toothbrush according to claim 4, wherein   The difference between the height of the other end of the hairs of each first hair bundle from the head portion and the height of the hairs of each second hair bundle from the head portion is 2.0 mm or less. Item 6. The toothbrush according to item 5.   The toothbrush according to any one of claims 1 to 6, wherein a difference between a tip height of the first bristle bundle and a tip height of the second bristle bundle is 1.0 mm or more. The tip of the head section,
The toothbrush according to any one of claims 1 to 8, wherein the toothbrush is formed in a triangular shape having a pair of side edges such that the width becomes narrower toward the tip.