JP6226618B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush.

  In the toothbrush, various ideas have been made to enhance the plaque removal effect. However, with the conventional toothbrush, it is difficult to fit all the tips of the hair bundles planted on the flocked surface of the head portion to the teeth. For this reason, some hair bundles may be greatly bent locally during brushing, or some hair bundles may not come into contact with the teeth, especially in users with poor brushing techniques. Plaque is likely to remain in the corners, causing caries and periodontal disease.

Thus, for example, the following toothbrushes have been proposed as toothbrushes for fitting the tips of the hairs implanted in the head part to the teeth as a whole.
A toothbrush that is recessed in a mortar shape so that the upper surface of the flocked portion becomes lower toward the center from the outer periphery of the flocked portion (Patent Document 1).

Japanese Utility Model Publication No. 5-39329

  However, when the toothbrush of Patent Document 1 is used, it is easy to fit the bristles on the tooth surface, so the plaque removal effect on the tooth surface is high, but the plaque is removed from the gaps between the teeth and the neck. Is difficult.

  The present invention makes it easy to fit the teeth to the teeth as a whole, has an excellent feeling of use, has an excellent plaque removal effect, and efficiently removes plaque from the gaps between the tooth surface, interdental teeth, and neck of the tooth Provide a toothbrush that can.

  The toothbrush of the present invention is a toothbrush in which a plurality of hair bundles in which a plurality of bristles are bundled are implanted on the flocked surface of the head portion, and is implanted in the central region of the flocked surface so as to be aligned to an arbitrary bristle length. The first hair bundle group and the hair length are aligned higher than the first hair bundle group, provided on the front end side and the rear end side of the head portion across the first hair bundle group, A pair of second hair bundle groups spaced apart from each other, and the hair length is aligned higher than that of the second hair bundle group, and the front end side and the rear end of the head portion sandwiching the pair of second hair bundle groups And a pair of third hair bundle groups spaced apart from each other, wherein the pair of second hair bundle groups and the pair of third hair bundle groups are in the center direction of the flocked surface And is arranged so as to surround the first hair bundle group.

  In the toothbrush of the present invention, the diameter of the hair bundle of the second hair bundle group and the diameter of the hair bundle of the third hair bundle group may be smaller than the diameter of the hair bundle of the first hair bundle group. preferable.

  The toothbrush of the present invention is easy to fit on teeth as a whole and has an excellent feeling of use and has an excellent plaque removing effect. It effectively removes plaque from the tooth surface, gaps between teeth, and neck of the tooth. Can be removed.

It is a top view of the head part in the toothbrush of 1st embodiment of this invention. It is a side view of the toothbrush of FIG. It is a top view of the head part in the toothbrush of other embodiments of the present invention. It is a side view of the toothbrush of FIG. It is a top view of the head part in the toothbrush of the comparative example 1.

In the present invention, “aligning the hair length of the hair bundle group” means that the hair length is aligned visually. That is, in addition to the hair length of each hair bundle being completely the same, those having slightly different hair length are also included. The error of the hair length in the hair bundle group in which the hair length is aligned is preferably ± 10% or less, and more preferably ± 5% or less.
In addition, a direction from the front end to the rear end in the head portion is a length direction, and a direction perpendicular to the length direction is a width direction.

<First embodiment>
Hereinafter, the toothbrush of 1st embodiment of this invention is demonstrated based on FIG.1 and FIG.2.
The toothbrush 1 of the present embodiment includes a handle body 14 including a long handle portion 10 and a head portion 12 provided at the tip of the handle portion 10. The toothbrush 1 includes a first hair bundle group 16, a second hair bundle group 18, and a third hair bundle group 20 on the flocked surface 12 a of the head portion 12.

[Handle]
The handle body 14 is formed by integrally forming the handle portion 10 and the head portion 12.
The shape and size of the handle portion 10 and the head portion 12 of the handle body 14 are not particularly limited, and a normal shape and size employed in a toothbrush can be appropriately employed.

The handle body 14 is obtained, for example, by injection molding a resin. The resin forming the handle body 14 is determined in consideration of the rigidity and mechanical characteristics required for the toothbrush 1. For example, a high-hardness resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa can be given.
Examples of such high-hardness resins include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylenedimethylene terephthalate (PCT), polyacetal (POM), polystyrene (PS), and acrylonitrile. -Butadiene / styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile / styrene copolymer resin (AS) and the like. These resins may be used alone or in combination of two or more.

[First hair bundle group]
The first hair bundle group 16 mainly contacts the tooth surface and serves to remove plaque adhering to the tooth surface.
The first hair bundle group 16 is formed by planting a plurality of first hair bundles 16 a aligned in an arbitrary hair length in the central region of the hair transplant surface 12 a of the head portion 12. In other words, the plurality of first hair bundles 16a are formed by planting the plurality of first hair bundles 16a in the central region of the hair transplant surface 12a of the head portion 12, and the plurality of first hair bundles 16a. Are aligned with each other.

  The first hair bundle group 16 in this example is composed of nine first hair bundles 16a, and these first hair bundles 16a are arranged in a staggered manner so as to form a rhombus in plan view. Yes. More specifically, the first hair bundles 16 a are arranged so that the rhombus diagonals in plan view of the first hair bundle group 16 are in the length direction and the width direction of the head portion 12.

The number of the first hair bundles 16a forming the first hair bundle group 16 is not limited to 9, and may be 8 or less, or 10 or more. What is necessary is just to set suitably the number of the 1st hair | bristle bundles 16a which form the 1st hair | bristle bundle group 16, considering the diameter of the 1st hair | bristle bundle 16a, etc., 4-16 pieces are preferable.
In addition, the shape of the first hair bundle group 16 in plan view is not limited to a rhombus, and may be a square, a hexagon, a circle, an ellipse, or the like.

The first hair bundle 16a is formed by bundling a plurality of hairs.
The hair for forming the first hair bundle 16a is not particularly limited. For example, the hair (taper hair) whose diameter is gradually reduced toward the hair tip and the tip is sharpened, and gradually toward the hair tip. For example, hair having a reduced diameter and having a tip diameter larger than that of the tapered hair (semi-tapered hair) and hair having a substantially same outer diameter except for the rounded portion of the hair tip (straight hair) can be used. The semi-tapered hair can be obtained, for example, by partially scraping off the tip of the tapered hair or adjusting the processing conditions (time) during chemical treatment.
The 1st hair | bristle bundle 16a may be formed only by the taper hair, may be formed only by the semi taper hair, may be formed only by the straight hair, a taper hair, a straight hair, and a semi taper. You may form combining 2 or more types among hair. The first hair bundle 16a is preferably formed of straight hair or semi-tapered hair from the viewpoint that the effect of removing plaque adhering to the tooth surface is enhanced.

  The material for the bristles is not particularly limited, and those normally used for toothbrush bristles can be used. For example, polyamide such as 6-12 nylon and 6-10 nylon, polyester such as PET, polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), Examples thereof include resin materials such as polyolefins such as PP, olefin elastomers, and styrene elastomers. These resin materials may be used individually by 1 type, and may use 2 or more types together.

The cross-sectional shape of the hair is preferably circular. In addition, the cross-sectional shape of the hair is not limited to a circle, and for example, an ellipse, a polygon (for example, a triangle, a quadrangle, a pentagon, a hexagon, etc.), an irregular shape (for example, a star, a three-leaf clover shape, a four It may be a clover-shaped clover.
The number of hairs for forming the first hair bundle 16a may be appropriately set so that the diameter of the first hair bundle 16a is a desired value.
In the first hair bundle 16a, a plurality of hairs having different thicknesses may be used in any combination in consideration of a feeling of use, a cleaning feeling, a cleaning effect, durability, and the like.

[Second hair bundle group]
The second hair bundle group 18 is provided in a pair on the front end 13 side and the rear end side of the head portion 12 with the first hair bundle group 16 interposed therebetween on the hair transplantation surface 12a of the head portion 12. The pair of second hair bundle groups 18 are separated from each other. That is, the second hair bundle 18 a forming the pair of second hair bundle groups 18 is not arranged on both sides in the width direction of the first hair bundle group 16.
As described above, the second hair bundle 18a is not disposed on both sides of the first hair bundle group 16 in the width direction, so that each second hair of the pair of second hair bundle groups 18 is arranged. The bristles of the bundle 18a are likely to enter gaps between the teeth and the neck. As a result, the second hair bundle group 18 can efficiently scrape and remove the plaque present in the gaps between the teeth and the neck.

  The second hair bundle group 18 is formed by planting a plurality of second hair bundles 18 a, and the hair lengths of the plurality of second hair bundles 18 a are the same as those of the first hair bundle group 16. It is arranged higher than the hair length. As a result, a step is formed at the boundary between the first hair bundle group 16 and the second hair bundle group 18. Since the first hair bundle group 16 and the second hair bundle group 18 are formed with steps, it is possible to efficiently scrape the plaque present in the gaps between the teeth and the neck portion. The removal effect is increased.

The second hair bundle group 18 is formed by arranging the respective second hair bundles 18a so as to open the central direction of the flocked surface 12a and surround the first hair bundle group 16. Specifically, in this example, the second hair bundle group 18 is arranged in a V shape so as to surround the first hair bundle group 16 by opening the center direction of the flocked surface 12a. Further, the angle of the V-shaped second hair bundle group 18 in this example is the same as the angle formed by the two sides on the second hair bundle group 18 side in the rhombus of the first hair bundle group 16. .
The angle of the V-shaped second hair bundle group 18 may be different from the angle formed by the two sides on the second hair bundle group 18 side in the rhombus of the first hair bundle group 16.

  The second hair bundle group 18 is scraped out by the second hair bundle group 18 by being disposed so as to surround the first hair bundle group 16 by opening the center direction of the flocked surface 12a as described above. It becomes easy for dirt, such as dental plaque, to gather at the center portion in the width direction of the second hair bundle group 18. Therefore, it is possible to suppress the dirt from escaping from both sides in the width direction of the second hair bundle group 18 while being scraped by the second hair bundle group 18 and remaining in a gap such as between teeth.

  In this example, each second hair bundle 18a of the second hair bundle group 18 is arranged in a staggered arrangement including the first hair bundle 16a of the first hair bundle group 16. However, it is not limited to such a sequence.

The arrangement shape of the second hair bundle group 18 is not limited to the V shape, and may be, for example, an arc shape.
The arrangement shape of the second hair bundle group 18 is preferably V-shaped because it has a high effect of scraping plaque from the gaps between the teeth and the neck.

In this example, in one second hair bundle group 18, a total of ten second hair bundles 18a are arranged in a double direction in the length direction.
The number of the second hair bundles 18a forming the second hair bundle group 18 is not limited to 10, and may be 9 or less, or 11 or more. What is necessary is just to set suitably the number of the 2nd hair | bristle bundle 18a which forms the 2nd hair | bristle bundle group 18 considering the diameter of the 2nd hair | bristle bundle 18a, etc., 3-18 are preferable, and 5-10 Is more preferable.
Moreover, the 2nd hair | bristle bundle group 18 may be formed by arrange | positioning the 2nd hair | bristle bundle 18a single in the length direction, and may be arrange | positioned and arranged in triple or more.

The aspect of the pair of second hair bundle groups 18 may not be symmetrical as long as the effect of the present invention is not impaired. That is, the aspect of the second hair bundle group 18 on the front end side and the second hair bundle group 18 on the rear end side may be different as long as the effects of the present invention are not impaired.
For example, the number of second hair bundles 18a may be different between the second hair bundle group 18 on the front end side and the second hair bundle group 18 on the rear end side, and the arrangement of the second hair bundles 18a The shape may be different.
The pair of second hair bundle groups 18 are preferably symmetrical with the same number and arrangement shape of the second hair bundles 18a.

The second hair bundle 18a is formed by bundling a plurality of hairs.
The hair for forming the second hair bundle 18a is not particularly limited, and examples thereof include those listed for the first hair bundle 16a.
The second hair bundle 18a may be formed of only tapered hair, may be formed of only semi-tapered hair, may be formed of only straight hair, tapered hair, straight hair, semi-tapered. You may form combining 2 or more types among hair. The second hair bundle 18a is preferably formed of tapered hair from the viewpoint that the effect of removing plaque existing in gaps such as between the teeth and the neck is increased.

Examples of the cross-sectional shape of the hair for forming the second hair bundle 18a include those mentioned for the first hair bundle 16a, and a circular shape is preferable.
In the second hair bundle 18a, a plurality of hairs having different thicknesses may be arbitrarily combined and used in consideration of a feeling of use, a brushing feeling, a cleaning effect, durability, and the like.

It is preferable that the second hair bundle 18a bend more easily than the first hair bundle 16a. As a result, the hair tips of the second hair bundle 18a can easily enter between the teeth and the gap between the tooth necks, and the plaque removal effect is enhanced.
What is necessary is just to set suitably the number of the hairs which form the 2nd hair | bristle bundle 18a so that the diameter of the 2nd hair | bristle bundle 18a may become a desired value.

[Third hair bundle group]
The third hair bundle group 20 is provided in a pair on the front end 13 side and the rear end side of the head portion 12 across the pair of second hair bundle groups 18 on the flocked surface 12a of the head portion 12. . The pair of third hair bundle groups 20 are separated from each other. That is, the third hair bundle 20 a forming the pair of third hair bundle groups 20 is not arranged on both sides in the width direction of the first hair bundle group 16.
As described above, the third hair bundle 20a is not disposed on both sides of the first hair bundle group 16 in the width direction, so that each third hair is similar to the second hair bundle group 18. The bristles of the bundle 20a can easily enter gaps between the teeth and the neck, and as a result, the plaque removal efficiency is increased.

  The third hair bundle group 20 is formed by planting a plurality of third hair bundles 20a, and the hair length of the plurality of third hair bundles 20a is that of the second hair bundle group 18. It is arranged higher than the hair length. Thereby, a step is formed at the boundary portion between the second hair bundle group 18 and the third hair bundle group 20. Since the second hair bundle group 18 and the third hair bundle group 20 are formed with steps, it is possible to efficiently scrape the plaque present in the gaps between the teeth and the neck portion. The removal effect is increased.

The third hair bundle group 20 opens the central direction of the flocked surface 12a, and surrounds the first hair bundle group 16 outside the second hair bundle group 18, so that each third hair bundle 20a. Are arranged. That is, the third hair bundle group 20 is formed so as to surround the first hair bundle group 16 and the second hair bundle group 18.
Specifically, in this example, the third hair bundle group 20 opens the central direction of the flocked surface 12a and surrounds the first hair bundle group 16 outside the second hair bundle group 18. It is arranged in a V shape. In addition, the angle of the V-shaped third hair bundle group 20 in this example is the same as the angle of the second hair bundle group 18.
The angle of the V-shaped third hair bundle group 20 may be different from the angle of the second hair bundle group 18.

  In this way, the third hair bundle group 20 is disposed so as to surround the first hair bundle group 16 by opening the center direction of the flocked surface 12 a, and similarly to the second hair bundle group 18. Since dirt is difficult to escape from both sides of the third hair bundle group 20 in the width direction, the plaque removal effect is enhanced.

  Further, in this example, the third hair bundle 20 a of each of the third hair bundle groups 20 is the second hair bundle group 18 of the first hair bundle group 16 and the second hair bundle group 18 of the second hair bundle group 18. Although it arrange | positions so that it may be staggered including the hair | bristle bundle 18a, it is not limited to such an arrangement | sequence.

The arrangement | sequence shape of the 3rd hair | bristle bundle group 20 is not limited to V shape, For example, circular arc shape may be sufficient.
The arrangement shape of the third hair bundle group 20 is preferably V-shaped because it has a high effect of scraping plaque from gaps between the teeth and the neck.

In this example, in one third hair bundle group 20, five third hair bundles 20a are arranged in a single line in the length direction.
The number of third hair bundles 20a forming the third hair bundle group 20 is not limited to five, but may be four or less, or may be six or more. What is necessary is just to set suitably the number of the 3rd hair | bristle bundle 20a which forms the 3rd hair | bristle bundle group 20, considering the diameter of the 3rd hair | bristle bundle 20a, etc., 3-18 are preferable, and 5-10 Is more preferable.
Moreover, the 3rd hair | bristle bundle group 20 may be formed by arrange | positioning the 3rd hair | bristle bundle 20a more than double in the length direction.

The aspect of the pair of third hair bundle groups 20 may not be symmetrical as long as the effect of the present invention is not impaired. In other words, the third hair bundle group 20 on the front end side and the third hair bundle group 20 on the rear end side may have different aspects as long as the effects of the present invention are not impaired.
For example, the number of the third hair bundles 20a may be different between the third hair bundle group 20 on the front end side and the third hair bundle group 20 on the rear end side, and the arrangement of the third hair bundles 20a The shape may be different.
The pair of third hair bundle groups 20 are preferably symmetrical with the same number and arrangement shape of the third hair bundles 20a.

The third hair bundle 20a is formed by bundling a plurality of hairs.
The hair for forming the third hair bundle 20a is not particularly limited, and examples thereof include those exemplified in the third hair bundle 20a.
The 3rd hair | bristle bundle 20a may be formed only by the taper hair, may be formed only by the semi taper hair, may be formed only by the straight hair, a taper hair, a straight hair, a semi taper You may form combining 2 or more types among hair. The third hair bundle 20a is preferably formed of tapered hair from the viewpoint of increasing the effect of removing plaque existing in gaps such as between the teeth and the neck.

Examples of the cross-sectional shape of the hair for forming the third hair bundle 20a include those mentioned for the first hair bundle 16a, and a circular shape is preferable.
In the third hair bundle 20a, a plurality of hairs having different thicknesses may be arbitrarily combined and used in consideration of a feeling of use, a feeling of cleaning, a cleaning effect, durability, and the like.

It is preferable that the third hair bundle 20a bend more easily than the first hair bundle 16a. Thereby, the hair tip of the 3rd hair | bristle bundle 20a becomes easy to enter into the clearance gap between teeth or a tooth neck part, and a plaque removal effect increases.
What is necessary is just to set suitably the number of the hair for forming the 3rd hair | bristle bundle 20a so that the diameter of the 3rd hair | bristle bundle 20a may be made into a desired value.

  As described above, in the toothbrush 1, a pair of second hair bundle groups 18 having a hair length higher than that of the first hair bundle group 16 are provided so as to sandwich the first hair bundle group 16. A pair of third hair bundle groups 20 having a hair length higher than that of the second hair bundle group 18 are provided so as to sandwich the hair bundle group 18. Thereby, in the toothbrush 1, the bristle height becomes high in steps toward the front-end | tip 13 side and the rear-end side of the head part 12 from the center area | region of the flocked surface 12a.

[Dimensions of hair bundles]
The hair length d1 (FIG. 2) of the first hair bundle group 16 can be set as appropriate, and is preferably 7 to 12 mm, more preferably 8 to 11 mm. When the hair length d1 of the first hair bundle group 16 is less than the lower limit value, the hair may not bend so much that pain may be felt when it hits the gingiva. Also, the polishing comfort may be worse. If the hair length d1 of the first hair bundle group 16 exceeds the upper limit value, the intraoral operability may be deteriorated.

The hair length d2 (FIG. 2) of the second hair bundle group 18 is aligned so as to be higher than the hair length d1 of the first hair bundle group 16.
The difference (d2-d1) in the hair length d2 of the second hair bundle group 18 with respect to the hair length d1 of the first hair bundle group 16 is preferably 0.5 to 3.0 mm, and more preferably 0.5 to 2.0 mm. More preferred. When the difference (d2−d1) is less than the lower limit value, the second hair bundle is less likely to enter between teeth or the neck. When the difference (d2−d1) exceeds the upper limit value, the first hair bundle may not hit the tooth surface, or the second hair bundle may hit the gum and feel pain.

The hair length d3 (FIG. 2) of the third hair bundle group 20 is aligned to be higher than the hair length d2 of the second hair bundle group 18.
The difference (d3−d2) in the hair length d3 of the third hair bundle group 20 with respect to the hair length d2 of the second hair bundle group 18 is preferably 0.5 to 3.0 mm, and more preferably 0.5 to 2.0 mm. More preferred. When the difference (d3−d2) is less than the lower limit value, the third hair bundle is less likely to enter between the teeth or the neck. When the difference (d3-d2) exceeds the upper limit value, the first hair bundle may not hit the tooth surface, or the third hair bundle may hit the gingiva and feel pain.

  The diameters of the second hair bundle 18a and the third hair bundle 20a are preferably smaller than the diameter of the first hair bundle 16a. As a result, dental plaque on the tooth surface is sufficiently removed by the first hair bundle 16a, and the hair tips of the second hair bundle 18a and the third hair bundle 20a are inserted into the gaps between the teeth and the tooth neck. Thus, it becomes easy to remove plaque in the gap.

  The diameter of the first hair bundle 16a is preferably 1.0 to 2.0 mm, and more preferably 1.4 to 1.8 mm. If the diameter of the first hair bundle 16a is less than the lower limit value, the effect of removing plaque on the tooth surface may be reduced. If the diameter of the first hair bundle 16a exceeds the upper limit value, the first hair bundle 16a may be excessively bent and impair the feeling of use.

The diameter of the second hair bundle 18a is preferably 1.0 to 1.6 mm, and more preferably 1.1 to 1.3 mm. When the diameter of the second hair bundle 18a is less than the lower limit, the gingiva may be painful. When the diameter of the second hair bundle 18a exceeds the upper limit value, the second hair bundle 18a is not bent so much that the feeling of use is impaired.
The preferable range of the diameter of the third hair bundle 20a is the same as the preferable range of the diameter of the second hair bundle 18a.

[Production method]
The manufacturing method of the toothbrush 1 includes a first bristle bundle 16a, a first bristle bundle 16a, a second bristle bundle 18a, and a third bristle bundle 20a each having a predetermined size. A known method can be adopted except that the second hair bundle group 18 and the third hair bundle group 20 are formed.
For example, as a method for planting hair bundles, a known method such as a method of driving a flat wire or a method of heat welding can be employed.
What is necessary is just to set the diameter of the hole at the time of planting a hair | bristle bundle suitably according to the diameter of the hair | bristle bundle to plant.

In the toothbrush 1 of the present invention described above, the first bristle bundle group 16, the second bristle bundle group 18, and the third bristle bundle group 20 are arranged from the central region of the flocked surface 12a to the tip 13 side of the head portion 12 and Since the hair height is gradually increased toward the rear end side, the hair tip fits the teeth as a whole during brushing. Thereby, it is excellent in a feeling of use, and while removing the plaque on the tooth surface by the first hair bundle group 16, the second hair bundle group 18 and the pair of third hair bundle groups 20 allow the interdental teeth and the neck. It is possible to scrape and remove plaque in the gaps of the parts and the like.
Further, the second hair bundle group 18 and the third hair bundle group 20 are arranged so as to open the center direction and surround the first hair bundle group 16, so that the interdental region, the tooth neck portion, etc. Since it is difficult for the plaque to escape from the second hair bundle group 18 and the third hair bundle group 20 when the plaque is scraped from the gap, a high plaque removal effect is obtained.

<Other embodiments>
The toothbrush of the present invention is not limited to the toothbrush 1 described above.
For example, the toothbrush 2 illustrated in FIGS. 3 and 4 may be the toothbrush of the present invention. 3 and FIG. 4 that are the same as those in FIG. 1 and FIG.
The toothbrush 2 is arranged in a zigzag manner so that the 14 first hair bundles 16b are hexagonal in a plan view to form a first hair bundle group 16A, and the diameter of the first hair bundle 16b is It is the same as the toothbrush 1 except that it is the same as the diameter of the second bristle bundle 18a and the third bristle bundle 20a.
As with the toothbrush 1, the toothbrush 2 also has an excellent feeling of use because the bristles fit the teeth as a whole during brushing, and it effectively removes plaque in the gap between the tooth surface, interdental teeth, and neck of the tooth. it can.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
[Evaluation of usability]
Ten monitors cleaned the oral cavity with the toothbrushes of each example, and the actual feeling of cleaning between the tooth neck, tooth surfaces and teeth, and the contact feeling of the toothbrushes were evaluated according to the following evaluation criteria.

(Real feeling of cleaning between the tooth neck, tooth surface, and teeth)
5 points: I feel very much.
4 points: I feel a little.
3 points: I feel.
2 points: I don't feel much.
1 point: I do not feel.
The average score of 10 monitors was ◎, the average score was 3.0 or more and less than 4.0, ◯, the average score was 2.0 or more and less than 3.0, and the average score was less than 2.0. .

(Fit feeling)
5 points: I feel very much.
4 points: I feel a little.
3 points: I feel.
2 points: I don't feel much.
1 point: I do not feel.
An average score of 10 or more monitors is 4.0 or more, an average score of 3.0 or more and less than 4.0 is ○, an average score of 2.0 or more 3
. A value less than 0 was evaluated as Δ, and an average score of less than 2.0 as ×.

(Comprehensive evaluation)
◎: All ◎.
○: ○ is the lowest evaluation.
Δ: Evaluation with the lowest Δ.
X: When there is even one x.

[Bristles]
The hair used in this example is as follows.
Tapered hair (ST): Made of PBT.
Semi-tapered hair (SST): Made of PBT.

[Example 1]
In accordance with the specifications shown in Table 1, hair bundles were implanted in a PP handle body to obtain the toothbrush 1 shown in FIGS.

[Example 2]
In accordance with the specifications shown in Table 1, a bristle bundle was implanted in a PP handle body to obtain the toothbrush 2 shown in FIGS.

[Comparative Example 1]
In accordance with the specifications shown in Table 1, a hair bundle was implanted in a PP handle body to obtain a toothbrush 101 of FIG.
The toothbrush 101 includes a first bristle bundle group 116, a second bristle bundle group 118 provided in pairs on the front end side and the rear end side of the head portion 12 with the first bristle bundle group 116 interposed therebetween, And a third hair bundle group 120 provided as a pair on the front end side and the rear end side of the head portion 12 with the hair bundle group 118 interposed therebetween.
The first hair bundle group 116 is formed by implanting five first hair bundles 116a in five rows and three rows in the width direction and three in the length direction. The second hair bundle group 118 is formed by implanting five second hair bundles 118a in 5 columns × 2 rows of 5 in the width direction and 2 in the length direction. The third hair bundle group 120 is formed such that four third hair bundles 120a are implanted in 4 columns × 1 row in the width direction and one in the length direction.

As shown in Table 1, the hair height is increased stepwise from the center region of the flocked surface toward the front end side and the rear end side, and the second and third hair bundle groups are moved to the center of the flocked surface. In Examples 1 and 2 arranged so as to open the direction and surround the first hair bundle group, the fitting feeling was excellent, the cleaning feeling was high, and the plaque removal effect was high.
On the other hand, the second hair bundle group and the third hair bundle group are not arranged to open the center direction of the flocked surface, and in Comparative Example 1 arranged linearly in the width direction, the fit is inferior. The feeling of cleaning was low and the plaque removal effect was inferior.

1, 2 Toothbrush 10 Handle part 12 Head part 13 Tip 14 Handle body 16, 16A First hair bundle group 16a, 16b First hair bundle 18 Second hair bundle group 18a Second hair bundle 20 Third hair Bundle group 20a Third hair bundle

Claims (6)

In the toothbrush in which a plurality of hair bundles in which a plurality of bristles are bundled are planted on the flocked surface of the head part,
A first group of hair bundles planted in the center region of the flocked surface, aligned to an arbitrary hair length;
The hair length is aligned higher than that of the first hair bundle group, provided on the front end side and the rear end side of the head portion across the first hair bundle group, and the width of the first hair bundle group A pair of second hair bundles in which hair bundles are not arranged on both sides in the direction ;
The hair length is aligned higher than that of the second hair bundle group, provided on the front end side and the rear end side of the head portion across the pair of second hair bundle groups, and the first hair bundle group Consisting of only a pair of third hair bundle groups in which no hair bundles are arranged on both sides in the width direction of
The pair of second hair bundle groups and the pair of third hair bundle groups are toothbrushes arranged so as to surround the first hair bundle group by opening a central direction of the flocked surface.   The toothbrush according to claim 1, wherein a diameter of the hair bundle of the second hair bundle group and a diameter of the hair bundle of the third hair bundle group are smaller than a diameter of the hair bundle of the first hair bundle group. . The first hair bundle group has a rhombus shape in plan view, and two diagonal lines of the rhombus shape are arranged so as to be parallel to the length direction and the width direction of the head portion, respectively. The toothbrush described. The first hair bundle group has a hexagonal shape in a plan view, and is arranged so that one diagonal line of the hexagonal shape is parallel to the length direction of the head portion. toothbrush. The toothbrush according to any one of claims 1 to 4, wherein the second bristle bundle group is arranged in a V shape or an arc shape in which a central direction of the flocked surface is opened in a plan view. The toothbrush according to any one of claims 1 to 5, wherein the third bristle bundle group is arranged in a V shape or an arc shape in which a central direction of the flocked surface is opened in a plan view.

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