JP3311991B2 - toothbrush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush which can effectively remove plaque and coloring of teeth during brushing and has a good feeling in use.

[0002]

2. Description of the Related Art In a conventional toothbrush, a bristle bundle consisting of a plurality of bristles is implanted in a plurality of implanted holes formed in an implanted portion by a flat line. The bristle is generally formed of a synthetic resin, has a circular cross section, and is bent at the center thereof so that a plurality of the bundles are bundled and sandwiches the flat wire, which is a metal plate. The hair is implanted as the above-mentioned bristle bundle. The horizontal length of the flat wire is formed slightly larger than the diameter of the flocking hole, and the bristle bundle is held by fitting the flat wire into the flocking hole.

On the other hand, in order to improve the cleaning property, massage property, plaque removing property or coloring prevention property, the material, shape and length of the bristle, the number and arrangement of the bristle bundle, and the upper end of the bristle are formed. Various proposals have been made regarding the shape of the brush surface or the shape of the flocked hole. Among the toothbrushes aiming at such performance improvement, those having a cross-sectional shape of the bristle other than a normal circular shape are disclosed in JP-A-61-168304, JP-A-6-233709, and
2-54427, JP-A-3-289906 and JP-T-8-50
No. 2908, etc. Further, the shape of the flocked hole is a square shape, JP-A-4-261605, JP-A-6-52556, JP-A-9-826626 and JP-A-9-82626
No. 9-182627, etc., those having an elliptical shape of the flocked hole are described in JP-A-6-261809, JP-A-8-332115 and JP-A-9-149815, respectively. I have.

[0004]

Toothbrushes having a bristle cross-sectional shape other than a normal circular shape are, for example, those having a polygonal cross-sectional shape aiming at an effect of scraping plaque by ridges on the side surfaces of the bristles (Japanese Patent Application Laid-Open No. 61-1986). -168304, Japanese Kaihei
2-54427, JP-A-3-289906 and JP-A-6-23
No. 3709), a bristle having a rectangular cross-sectional shape that is regularly oriented to enhance cleaning properties (Japanese Patent Application Laid-Open No. Hei 8-5029).
No. 08 publication), but none of them have sufficient ideas and considerations for removing plaque and coloring of teeth and feeling of use.

An object of the present invention is to provide a dental plaque /
An object of the present invention is to provide a toothbrush that can effectively remove coloring and has a good feeling in use.

[0006]

The invention according to claim 1 is
A plurality of bristle bundles formed of a plurality of bristles 1, 1,.
Each of the bristles 1, 1... Has a rectangular cross section having a long side and a short side, and 20% to 20% of the flocked holes 21, 21. 90% are formed in a rectangular shape, and one side thereof is arranged so as to be perpendicular to the axis L of the toothbrush, and 10% to 8% of the flocked holes 21, 21.
0% is formed in a substantially circular shape, and the bristle 1 implanted in the rectangular implanted hole 21 has a tip 12 formed in a truncated pyramid shape. , "The first invention" means the present invention), thereby achieving the above object.

According to a second aspect of the present invention, a bristle bundle comprising a plurality of bristles 1, 1... Is implanted in a plurality of implanted holes 21, 21. In the toothbrush, the bristles 1, 1
20% to 90% have a rectangular cross section having a long side and a short side, and the tip 12 is formed in a truncated pyramid shape, and 10% to 80%
Has a circular cross-section at its shaft portion, at least a part of the flocked holes 21, 21... Is formed in a rectangular shape, and one side thereof is perpendicular to the axis L of the toothbrush. A toothbrush (hereinafter referred to as a “second invention”) in which the bristle 1 having the truncated pyramid-shaped tip portion 12 is implanted in the rectangular implanted hole 21. In some cases, the present invention has been achieved).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A toothbrush according to an embodiment of the present invention (first invention) (hereinafter, referred to as first embodiment) will be described below with reference to the drawings. FIG. 1 is a perspective view showing a flocking portion in the first embodiment, FIG. 2 is a side view of the toothbrush of the first embodiment, FIG. 3 shows a bristle of the toothbrush of the first embodiment, and (a) is a perspective view. , (B) is a front view, (c) is a side view, FIG. 4 is an enlarged plan view showing a flocking state of a bristle bundle planted in a rectangular flocking hole in the first embodiment, and FIG. 5 is a first embodiment. FIG. 6 is an enlarged plan view showing a flocking state of the bristle bundle planted in the circular flocking hole in FIG. 6, and FIG. 6 is a diagram showing a state of a part of the bristle when the toothbrush of the first embodiment is used; ) Indicates a state in which the bristle is inserted into a gap between the teeth,
FIG. 7B shows a state in which the bristles have scraped out plaque and coloring, and FIGS. 7A and 7B show other arrangements of the flocked holes on the flocked portion in the first embodiment, respectively. It is a top view.

FIGS. 1 and 2 show a toothbrush of the first embodiment.
As shown in the figure, a bristle bundle composed of a plurality of bristles 1, 1... Is implanted in a plurality of implanted holes 21, 21. Nothing changes.

As shown in FIG. 1, in the toothbrush of the first embodiment, the bristles 1, 1,... Have a rectangular cross section having a long side and a short side. 20% to 90%, preferably 20% to 80% of the flocked holes 21, 21... Are formed in a rectangular shape, and are arranged so that one side thereof is perpendicular to the axis L of the toothbrush. , 10% to 8 of the flocked holes 21, 21,.
0%, preferably 20% to 80%, that is, a substantially circular shape except for a rectangular one, and the bristle 1 implanted in the rectangular implanted hole 21 has a tip 12 having a pyramid shape. It is formed in a trapezoidal shape. If the rectangular flocking holes 21 and 21 are less than 20%, the number of bristles 1, 1... Whose side surfaces are in surface contact with the tooth surface decreases, and a sufficient coloring and removing effect cannot be obtained. Rectangular flocking hole 21,
If the ratio of 21 exceeds 90%, a specific direction is generated as a whole on the side surfaces of the bristles 1, 1,..., And there is a possibility that the bristles cannot be moved smoothly during brushing.

Each of the bristles bundles is composed of a plurality of bristles 1, 1... Having the same shape, and the thickness of the shaft portions of the bristles 1, 1.

The toothbrush of the first embodiment will be described in more detail. As shown in FIGS. 1 and 2, the toothbrush of the first embodiment has a plurality of bristles 1, 1... And a grip portion 4 to be gripped during use, and a neck portion 3 connecting them.

The bristles 1, 1,... Implanted in the flocking holes 21, 21,.
The bristles 1 of the book are bent in two at the center thereof, and the bent portions are fitted into the flocking holes 21 while being held by the flat wires 11 so that the bristle is planted. The flat wires 11 are fitted into the flocking holes 21 and 21 so as to be perpendicular to the axis L. In FIG. 1,
Although only one bent bristle is shown to clearly show the configuration, the bristle 1
Needless to say, a plurality of hairs are bundled and implanted in the hair implantation holes 21 when the hairs are implanted.

The flocked portion 2 has a flat shape with no steps formed on its upper surface. On the upper surface of the flocked portion 2, a total of 22 rows of the flocked holes 21, 21..., 2-3-3-3-3-3-3-3-2, are formed from the tip side of the toothbrush. ing.

The first and even-numbered rows of the flocked holes 21, 21... From the tip end of the toothbrush are rectangular and have long sides and short sides, as shown in FIG. Are arranged perpendicular to the axis L, and the length of the short side is preferably 0.5 mm or more and 3 mm
Less than 1.0 mm, and more preferably less than 1.0 mm and less than 2.0 mm. If the length is less than 0.5 mm, it may be difficult to implant the hair, and if it exceeds 3 mm, the direction of the bristle 1 farthest from the flat line may not be controlled. The length of the long side of the flocking hole 21 is preferably 1.0 mm or more and less than 4 mm, more preferably 1.5 mm or less.
mm or more and less than 3 mm. If the length is less than 1.0 mm, flocking may be difficult, and if it exceeds 4 mm, sufficient bristle strength may not be obtained, and the bristle may shift or fall out.

The area (flocked area) of the rectangular the flocking holes 21 is preferably 1 mm ² to 4 mm ^2, more preferably from 1.5mm ² ~3.0mm ^2. The flocking area is 1
If it is less than mm ² , the number of flocks per hole is too small, and a sufficient contact area may not be obtained. The flocking area is 4 mm ²
Is exceeded, sufficient flocking strength cannot be obtained and bristle 1
There is a possibility that the sheet may shift or be easily removed. The flocked hole 2
Although it is determined to some extent from the relationship between the size of the bristles 1 and the size of the cross section of the bristles 1, it is preferable that about 10 to 50 bristles 1 be planted in one flocking hole 21.

Further, the flocked holes 2 other than the rectangular ones
1, are circular as shown in FIG. 1, and preferably have a diameter of 1.2 mm to 2.5 mm, and more preferably 1.4 mm to 2.0 mm. If the diameter is less than 1.2 mm, it is difficult to implant sufficient bristle, and there is a possibility that the total number of bristles is too small to exert a sufficient brushing effect. Too much, the feeling when brushing the teeth is deteriorated, the bending of the bristle is also deteriorated, and the movement of the bristle implanted in the adjacent rectangular implanted hole may be restricted.

The interval at which the flocking holes 21, 21,... Are formed is 0 in the vertical direction indicated by P ₁ (the interval between the rectangular shape and the circular shape and the interval between the rectangular shape and the rectangular shape) in FIG. .3
It is preferably from mm to 2.5 mm, more preferably from 0.6 mm to 2 mm. Further, the lateral spacing shown in FIG. 1 P ₂ (circular - between circular and rectangular - spacing between rectangular) is preferably 0.5mm~4mm, 0.7mm~3mm Is more preferable. If the distances P ₁ and P ₂ exceed 2.5 mm and 4 mm, respectively, the adjacent bristle bundles are too far apart to form teeth that do not hit the bristle, and there is a possibility that a sufficient coloring removal effect may not be obtained. is there.

Further, in the toothbrush of the first embodiment, as shown in FIG. 2, the length of the bristles 1, 1... The brush surface formed by the upper ends of 1... Is uneven when viewed from the side. By making the brush surface uneven, the bristle enters the gap between the teeth and the like, and as a result, the contact area between the bristle and the tooth increases, and at the same time, the flexibility (hardness) of the bristle changes, and the resulting toothbrush The range of choices for cleaning properties and usability is expanded. In the case of the first embodiment, hook-shaped irregularities are formed,
The bristle bundles in the first and second rows at the top are convex, and the bristle bundles in the rows behind them have irregularities alternately for each row. At this time, the step d between the highest and lowest bristle 1 is preferably 0.5 mm to 3.0 mm,
1.0 mm to 2.0 mm is more preferable. When the step d is 0.
If it is less than 5 mm, the highest bristle does not reach well between teeth. When the step d exceeds 3.0 mm,
The lowest bristle does not hit the tooth surface.

Further, on the uneven brush surface, each of the interval P ₃ between the convex and the convex and the interval P ₄ between the concave and the concave in FIG. 2 are each preferably 3 mm to 12 mm, and more preferably 4 mm. 10 mm. If these distances are less than 3 mm, there is a possibility that the long bristles 1, 1,... Support each other and the short bristles 1, 1,. If these gaps exceed 12 mm, long bristle 1, 1
・ Because there are too few, there is a possibility that a gap between the teeth that cannot reach the bristle 1, 1.

The height h (height from the upper surface of the flocked portion 2 to the upper end of the bristle 1) h (see FIG. 2) of the bristle 1 is preferably 8 mm to 13 mm, and more preferably 9 mm to 12 mm. When the height h is less than 8 mm, the bristle becomes difficult to bend too much, which may deteriorate not only the color removal property but also the massage property and the cleaning property.
In addition to being an obstacle during brushing, the "strain" may be too weak to deteriorate the color removal property, massage property, and cleaning property. When there is a difference in the length of the bristles 1, 1... Implanted in the implanted portion 2 as in the first embodiment, the highest height of the bristles 1 is within the above range. Is preferred.

The bristles 1, 1... Have the same shape not only in each bristle bundle but also on the entire surface of the flocked portion 2.

The bristle 1 has a long side and a short side.
Having a rectangular cross section, and the tip 12
As shown in FIG. 3A, it is formed in a truncated pyramid shape.
The long side of the upper end surface of the tip portion 12 having a truncated pyramid shape is shown in FIG.
As shown in (b), the bottom surface of the tip 12 is substantially the same as the long side.
With the same length, and the bristles can be ground with only one pair of surfaces.
It is done. Also, the front end portion 12 faces
Each side is symmetrically sloped and slightly outward
It is curved. The length l of the long side of the upper end face ₁Is a tooth and tooth
So that the removal of plaque and coloring in the gaps of
Preferably from 0.1 mm to 0.4 mm, more preferably
It is 0.15 mm to 0.3 mm. Length of the short side of the upper end surface
l_ThreeAs shown in FIG. 3 (c),
Length of the short side of the bottom surface l_FourShorter
It has been broken. The length l_ThreeIs preferably 0.01 mm
To 0.2 mm, more preferably 0.03 mm to 0.1 mm.
You. The length l_ThreeIs less than 0.01 mm, gums etc.
The length l_ThreeExceeds 0.2 mm,
The feel of the tip of the bristle may not be soft and teeth and teeth
There is a possibility that the bristle becomes difficult to enter the gap. The tip
12 height h_eThe tip 12 has a soft feel and
In order to give a good elasticity, preferably 1 mm to 10 mm,
It is preferably 3 mm to 8 mm.

The length l ₂ of the long side of the bottom surface is preferably 0.18 mm to 0.4 mm, more preferably 0.2 mm to 0.3 mm, in consideration of the function and grindability of the bristle. The length l ₄ of the short sides of the bottom surface is preferably from 0.1 mm to 0.2 mm, 0.12Mm～0.18Mm more preferred. The length l
_{If 4,} is less than 0.1 mm, the "strain" of the bristle is weakened, and there is a possibility that the color removal property, the massage property, and the cleaning property may be deteriorated, and if it exceeds 0.2 mm, the bristle becomes difficult to bend. In addition, there is a possibility that not only the color removal property but also the massage property and the cleaning property are deteriorated.

As shown in FIG. 4, the bristle bundle implanted in the rectangular implanted hole 21 preferably has an angle α between the long side of the upper end surface of the tip 12 of the bristle 1 and the axis L. The bristle 1 is planted so as to have an angle of 80 to 100 °, more preferably 85 to 95 °.

The angle α in the bristle bundle implanted in the circular implanted hole 21 is random at 0 ° to 180 ° as shown in FIG. The direction of the side is no longer directional.

The bristles 1, 1,... Implanted in the implanted holes 21, 21,... Are made of polybutylene terephthalate (PBT), nylon (6-12, 6-10, 6-6), polypropylene, etc. Is preferably formed.

The toothbrush of the first embodiment is constructed as described above. When brushing, the bristle 1 having the truncated pyramid-shaped tip 12 acts like a spatula to brush the tooth. As shown in FIG. 6 (a), since the abrasive 12 is efficiently applied to the tooth surface and the tip 12 has a tapered surface, the toothbrush slides smoothly into the gap between the teeth as shown in FIG. At this time, as shown in FIG. 6 (b), the bristles 1, 1... Are bent to efficiently scrape plaque and coloring in the gap between the teeth. Therefore, according to the toothbrush of the first embodiment, plaque and coloring of teeth can be effectively removed. In addition, when the toothbrush is moved in the vertical direction along the gap between the teeth, the bristle 1 having the truncated pyramid-shaped tip 12 cleans the dirt in the gap as when using a toothpick. Even when using a brushing method that moves the bristle without direction during brushing, such as the Phones method or the drawing circle method, the side surfaces of the bristles 1, 1... Can move smoothly without a specific direction as a whole. Therefore, the usability is good.

In the toothbrush of the first embodiment, most of the bristles 1, 1... Implanted in the rectangular implanted holes 21 can be brought into efficient surface contact with the tooth surface.
The color removal property can be further improved. In particular, the tip of the truncated pyramid abuts against the teeth and gums on the surface, so that the tip of the hair at the time of use is soft.

The toothbrush of the first invention is not limited to the above-described first embodiment, but can be variously modified.
For example, in the first embodiment, the bristles 1 may have a rectangular cross section with rounded corners. Also,
As shown in FIG. 1, the rectangular flocking holes 21
A side that has a long side and a short side and is parallel to the axis L is a short side, but may be a long side. Also,
The flocking hole 21 may be formed in a square shape having the same length on each side or a rectangular shape with rounded corners.

In the first embodiment, the shape of the substantially circular flocked hole 21 is circular, but may be elliptical, track circular, egg-shaped, or the like.

In the first embodiment, the bristle 1 having a rectangular cross section and implanted in the circular implanted hole 21 is used.
The tip 12 has a truncated pyramid shape, but may have a rectangular parallelepiped overall shape.

In the first embodiment, the bristles 1, 1,... Are implanted into the flocked holes 21, 21,. It may be performed by fusing.
Further, in the first embodiment, the uneven brush surface formed by the upper ends of the plurality of bristles has a hook shape as shown in FIG. 2, but a chevron shape, a saw blade shape, and a wavy shape. And the like.

In the first embodiment, the top end 12 of the truncated pyramid shape has the long side of the upper end surface equal to the long side of the bottom surface. May be shorter than the long side. In this case, the length of the long side of the upper end face is preferably 0.01 mm to 0.3 mm, and more preferably 0.08 mm to 0.25 mm. In the first embodiment, two types of bristles having these different truncated pyramid-shaped tips may be used together.

In the first embodiment, each of the bristle bundles is made of bristles 1, 1... Of the same shape, but may be made of bristles of different shapes. For example, the bristle bundle may be made up of two types of bristles having different truncated pyramid shaped tips as described above.

In the first embodiment, 2-3-3-3-3-3-3-2 from the tip side of the toothbrush, for a total of 8 rows and 2 rows
Of the two flocked holes 21, 21,...
The first and even-numbered rows from the tip end are rectangular, but the rectangular flocking holes 21, 21.
Are arranged only in the two rows on the top end side of the flocked portion 2 (see FIG. 7A), or are arranged only on the outer side of the top surface of the flocked portion 2 (see FIG. 7B). They may be arranged in a zigzag pattern.

In the first embodiment, each of the bristle bundles is formed of a plurality of bristles 1, 1... Having the same shaft portion, and at least two bristle bundles 1, 1. The bristle bundles having different pliability (hardness) are obtained by making the heights of the bristle bundles different. However, in the bristle bundles, the thicknesses of the shaft portions of the respective bristles 1, 1... Thus, bristle bundles having different pliability (hardness) may be obtained.

In the first embodiment, the upper surface of the flocking portion 2 is formed flat, but a step is provided to adjust the flexibility of the bristle bundle depending on the flocking portion, and to remove the coloring, the massage, and the like. It is also possible to tune the cleanability. Still further, the toothbrush of the first embodiment is formed in a form in which the gripper 4 is gripped by hand, but as a form without the gripper 4, such as a detachable head of an electric toothbrush. It may be formed.

One embodiment of the present invention (second invention)
8 and 9 and FIGS. 1 and 7 used for describing the first embodiment, the same reference numerals are given to the same components as those of the first embodiment. Will be explained. In the following, characteristic portions of the second embodiment are described, and the other points are the same as those of the first embodiment unless otherwise specified.
8 and 9 are perspective views showing various shapes of a bristle having a circular cross section in a shaft portion of the toothbrush of the second embodiment.

In the toothbrush of the second embodiment, 20% to 90%, preferably 20%, of the bristle 1, 1...
% To 80% have a rectangular cross section having a long side and a short side, and the tip 12 is formed in a truncated pyramid shape, and 10% to 80% of the bristles 1, 1... Preferably, 20% to 80%, that is, the shaft portion has a circular cross section except that the cross section is rectangular, and at least a part of the flocked holes 21, 21,. The bristles 1 each having a side perpendicular to the axis L of the toothbrush and each having the tip 12 having a truncated pyramid shape are implanted in the rectangular implanted holes 21. ing. If the number of the bristles 1 and 1 having a rectangular cross section is less than 20%, the number of the bristles whose side surfaces are in surface contact with the tooth surface decreases, and a sufficient coloring removal effect cannot be obtained. Bristles 1 with a rectangular cross section
If the number 1 is more than 90%, a specific direction is generated as a whole on the side faces of the bristles 1, 1,..., And there is a possibility that the bristles cannot be moved smoothly during brushing.

The second embodiment will be described in more detail. Each of the bristles bundles is composed of a plurality of bristles 1, 1...
・ ・ It is planted in the hair. A bristle bundle composed of the above-mentioned bristles 1, 1... Having a rectangular cross section (hereinafter, this bristle is referred to as a rectangular cross section bristle) is planted in the rectangular flocking holes 21, 21. Bristle 1, 1 ... with circular cross section
A bristle bundle composed of (hereinafter, this bristle is referred to as a circular cross-section bristle) is planted in the flocking holes 21, 21,... Shown in FIG. In addition to the rectangular cross-section bristles 1, 1 ..., the circular cross-section bristles 1, 1
.. Is implanted, so that the direction of the bristle side surface of the entire implanted portion 2 has no directionality. The thickness of the shaft of each of the rectangular cross-section bristles 1, 1, ... is the same,
Each of the cross sections of the bristles 1, 1... Has the same thickness. The circular cross-section bristle 1 has a tip 1
The shape of the toothbrush 2 can be varied as shown in FIG. 8 and FIG. 9, thereby giving a variation in the cleanability, feeling of use, and the like of the toothbrush. Bristle 1,1 ・
Are arranged in various arrangements as shown in FIG. 7,
A toothbrush corresponding to a wide variety of interdental portions resulting from a deep depth and poor alignment of teeth can be obtained.

The toothbrush of the second embodiment is configured as described above, and has the same effects as the toothbrush of the first embodiment, and also has various other effects. That is, the tip portion 12 of the circular cross-section bristle 1 has a spherical shape (see FIG. 8).
Thus, the hard colored matter and the soft plaque can be efficiently removed at the same time. In addition, when the distal end portion 12 has a tapered shape (see FIG. 9) or a tapered spherical shape, it is possible to efficiently remove soft plaque in a deep interdental portion which is degenerated due to a periodontal disease such as alveolar purulence. Does not hurt, degenerated, weakened gums.

The circular flocking holes 21, 21,...
When arranged as shown in (a), rectangular cross-section bristles 1, 1... Are implanted in two rows of rectangular implanted holes 21, 21. Because the circular cross-section bristles 1, 1... Are implanted in six rows, the coloring on the back side of the front teeth is changed to the rectangular cross-section bristles 1, 1,.
Can be efficiently removed by the truncated pyramid-shaped tips 12, 12,..., And the usability when polishing other portions can be improved. Also, the circular flocking holes 21, 21,...
When arranged as shown in (b), bristles 1, 1... With a rectangular cross section are implanted in rectangular implanted holes 21, 21.
Since a bristle with a circular cross section is implanted at 1, 21,..., It is effective to remove coloring matter between teeth and gums.

The toothbrush of the second invention is not limited to the above second embodiment, but can be variously modified. For example, in the second embodiment, the flocking holes 21 of the bristle 1 having the circular cross-section are formed in a circular shape, but are polygonal, triangular, square, rectangular (including square), and elliptical. Shape, track circle shape, fan shape, etc. may be used. In the second embodiment, the shape of the distal end portion 12 of the bristles 1 having a circular cross section is spherical, tapered, or tapered spherical, but is shaped like a truncated pyramid (FIG. 1).
0), a round shape or the like.

Also in the second invention, various changes in the first invention described above can be appropriately made without departing from the spirit of the second invention.

[0046]

According to the present invention, it is possible to provide a toothbrush which can effectively remove plaque and coloring of teeth during brushing and has a good feeling of use.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flocked portion in the first embodiment.

FIG. 2 is a side view of the toothbrush of the first embodiment.

FIGS. 3A and 3B show a bristle of the toothbrush according to the first embodiment, wherein FIG. 3A is a perspective view, FIG. 3B is a front view,
(C) is a side view.

FIG. 4 is an enlarged plan view showing a flocking state of a bristle bundle planted in a rectangular flocking hole in the first embodiment.

FIG. 5 is an enlarged plan view showing a flocking state of a bristle bundle planted in a circular flocking hole in the first embodiment.

FIG. 6 is a view showing a state of a part of bristles when the toothbrush of the first embodiment is used, and FIG.
Shows a state in which the bristle is inserted into a gap between the teeth, and FIG. 4B shows a state in which the bristle is plaque and coloring.

FIGS. 7 (a) and 7 (b) are plan views each showing another arrangement of the flocking holes on the flocking portion in the first embodiment.

FIG. 8 is a perspective view showing a bristle having a circular cross section in a central portion in the toothbrush of the second embodiment.

FIG. 9 is a perspective view showing another shape of a bristle having a circular cross section at a central portion in the toothbrush of the second embodiment.

FIG. 10 is a perspective view showing another shape of a bristle having a circular cross section in a central portion of the toothbrush of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bristle 12 Tip part 2 Flooding part 21 Flooding hole L axis

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidenori Yoshida 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Prefecture, Japan Kao Co., Ltd. Inventor Miyuki Okajima 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Pref. Kao Co., Ltd. (56) References JP-A-61-168304 (JP, A) JP-A-6-233709 (JP, A) JP-A 10-42956 (JP, A) JP-A 2-54427 (JP, U) JP-A 63-163634 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A46D 9/04

Claims (2)

(57) [Claims] 1. A toothbrush in which bristles bundles comprising a plurality of bristles 1, 1... Are implanted in a plurality of implanted holes 21, 21... Formed in an implanted portion 2, respectively. , 1.. Has a rectangular cross section having a long side and a short side, and 20% to 90% of the flocked holes 21, 21. Are arranged substantially perpendicular to the axis L of the toothbrush, and 10% to 80% of the flocked holes 21, 21... Are formed in a substantially circular shape. A toothbrush characterized in that the bristle 1 implanted in the bristles has a tip 12 formed in a truncated pyramid shape. 2. A toothbrush in which bristle bundles comprising a plurality of bristles 1, 1,... Are implanted in a plurality of implanted holes 21, 21,... Formed in an implanted portion 2, respectively. , 1,... Have a rectangular cross section having a long side and a short side, and the tip 12 is formed in a truncated pyramid shape.
1 to 10% to 80% of the shaft portion has a circular cross section, and at least a part of the flocked holes 21, 21... Is formed in a rectangular shape, and one side thereof is A toothbrush characterized in that the bristle 1 whose tip portion 12 has a truncated pyramid shape is implanted in the rectangular implanted hole 21, which are arranged so as to be perpendicular to the axis L of the toothbrush. .