JP6712120B2 - toothbrush - Google Patents

Description

The present invention relates to toothbrushes.

At present, there are various types of toothbrush heads having different sizes depending on the taste and purpose of the user. From the viewpoint of oral hygiene, a compact head that “pours one tooth at a time” is generally suitable, but for those who lack sufficient polishing techniques, those who prioritize efficient polishing in a short time. For this reason, a "wide head type" toothbrush having a wide head portion that can simultaneously polish the tooth neck portion, the tooth gap, and the tooth surface may be suitable.

The problem with this "wide head type" toothbrush is that cleaning efficiency is high because multiple cleaning parts can be cleaned at the same time, but the "cleaning accuracy" of each part, especially the gap between the teeth and the neck, etc. Regarding the cleaning of the part, there is a point that it is inferior. This is because the bristle tips of the toothbrush hit the peripheral parts other than the desired part to be polished, and physical interference easily occurs.

By the way, in a conventional toothbrush of a general size, a configuration has been proposed in which a height difference is provided at the bristle tips in the brush in order to improve cleaning efficiency (Patent Document 1). This has the advantage that the height of the flock at the center is shorter than the height of the flock around it, so that the teeth can be brushed across the dentition. That is, it is possible to simultaneously polish the upper surface and one side surface of one tooth.

Utility model registration No. 3142875

However, with a toothbrush of a general size as in Patent Document 1, it is difficult to simultaneously polish the cervical part, the interdental part, and the tooth surface, and people who place importance on efficiently polishing a plurality of cleaning parts in a short time. Can not be satisfied. In addition, since the cushioning property of the entire brush is not emphasized, it cannot be said that the comfort of hitting the gums is good.

The present invention has been made in view of the above circumstances, and it is possible to simultaneously clean a plurality of cleaning parts with a wide head specification, and to provide a high cleaning property and a gentle contact feeling even for each gap shape. With the goal.

A toothbrush according to an aspect of the present invention includes a head portion in which a plurality of hair bundles are respectively implanted in a width direction and a longitudinal direction of a flocked surface , and a handle body extending from the head portion. The dimension of the head portion in the width direction intersecting the extending direction is 13 mm or more, and the number of the hair bundles constituting one row in the width direction is at least 5 or more, and the head portion is an outer tufts consisting bristles use of any height, most use bristles having a height, an inner wherein a lower height than use bristles having the highest height in the outer tufts in one tuft A bunch of bristles, and a plurality of outer bristles arranged on the outer periphery of the head part surrounds a plurality of inner bristles arranged in the center of the head part. The outer hair bundle and the inner hair bundle are planted by implanting a flat wire sandwiched between the two folded hair bundles into a hair transplant hole formed in the hair transplant surface, Each of the outer hair bundles has two semi-hair bundles formed by sandwiching a flat wire, and the outer hair bundle includes one of the plurality of hairs having the first height in one hair bundle. Between the half-hair bundle portion and the other half-hair bundle portion having a plurality of the hairs having the second height lower than the first height, the inner hair bundle has one hair. In the bundle, from the one half-hair bundle part composed of the plurality of hairs having the third height, and the plurality of hairs having the fourth height lower than the third height A step of 1 mm or more is provided between each of the other half bristles, and the inner bristles are arranged between the outer bunches arranged in the width direction of the head part. in what was between, and long one of the haired length half bristle bundle portion, and a short while the semi tuft portion of hair length, are arranged alternately in the arrangement direction, one of the plurality of the outer tufts each other The half hair bundles are equal to each other at the first height, the other half hair bundle portions are equal to each other at the second height, and one of the half hairs of the plurality of inner hair bundles is The bundle portions are equal to each other at the third height, and the other half-hair bundle portions are equal to each other at the fourth height .

In the toothbrush according to one aspect of the present invention, a plurality of central bristle bundles that separate the plurality of inner bristle bundles into two are provided in a longitudinal direction of the head portion, and a bristle length of the central bristle bundle is equal to that of the outer bristle bundle. You may make it the structure equal to a hair length.

In the toothbrush according to the aspect of the present invention, one half bristle bundle portion of the outer bristle bundle and one half bristle bundle portion of the inner bristle bundle may have the same bristle length.

In the toothbrush according to one aspect of the present invention, the half bristle bundle portions of the outer bristle bundle and the half bristle bundle portions of the inner bristle bundle may have different hair lengths.

In the toothbrush according to one aspect of the present invention, the difference between the half bristle bundle portions of the outer bristle bundle and the difference between the half bristle bundle portions of the inner bristle bundle may each be 1 mm or more.

In the toothbrush according to one aspect of the present invention, the number of bristles forming one row in the width direction of the head portion may be five or more.

In the toothbrush according to the aspect of the present invention, at least one of the outer bristle bundle and the inner bristle bundle may include a plurality of bristles having sharpened tips.

In the toothbrush according to one aspect of the present invention, the outer bristle bundle and the inner bristle bundle are planted by implanting a flat line sandwiched between the folded bristle bundles into a planted hole formed on the planted surface. It may be configured such that the two half-hair bundle portions are provided so as to sandwich the flat wire.

In the toothbrush according to one aspect of the present invention, the distance between the outer hole edges of the two outermost flocked holes on both sides in the width direction of the head portion may be 10 mm or more.

In the toothbrush according to one aspect of the present invention, the flocked region surrounded by connecting the respective hole edges of the plurality of flocked holes located on the outermost side of the head portion may be 1.5 cm ² or more. ..

According to the present invention, it is possible to simultaneously clean a plurality of cleaning parts with a wide head specification, and it is possible to provide a toothbrush with high cleanability and a gentle touch even for each gap shape.

The side view which shows the whole toothbrush structure in 1st Embodiment. The top view of the head part which shows the arrangement pattern of a hair bundle. The schematic diagram which shows the hair bundle in a straight line straight hair type. (A) is a figure which shows typically the structure of the head part in 1st Embodiment, (b) is a figure which partially expands and shows the brush structure of the head part in 1st Embodiment, (b) is. , (A) is an enlarged view of a region surrounded by a broken line. (A) is a figure which shows the structure of the head part in 2nd Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). (A) is a figure which shows the structure of the head part in 3rd Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). (A) is a figure which shows the structure of the head part in 4th Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). (A) is a figure which shows the structure of the head part in 5th Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). The top view which shows the structure in the head part of the toothbrush of 6th Embodiment. 10A is a cross-sectional view taken along the line BB′ of FIG. 9, schematically showing the configuration of the head portion in the sixth embodiment, and FIG. 10B is a broken line in FIG. 10A. Enlarged view of the area surrounded by. 11A is a cross-sectional view taken along the line A-A′ in FIG. 9, and FIG. 11B is an enlarged view of a region surrounded by a broken line in FIG. (A) is a figure which shows the structure of the head part in 7th Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). (A) is a figure which shows the structure of the head part in 8th Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a). (A) is a figure which shows the structure of the head part in 9th Embodiment typically, (b) is an enlarged view of the area|region enclosed with the broken line in (a).

[First Embodiment]
Below, the toothbrush of 1st Embodiment which concerns on this invention is demonstrated.
FIG. 1 is a side view showing the overall configuration of the toothbrush according to the first embodiment. FIG. 2 is a plan view of the head portion showing the arrangement pattern of the hair bundle. FIG. 3 is a schematic view showing a hair bundle in a straight-line straight hair type. FIG. 4A is a diagram schematically showing the configuration of the head unit in the first embodiment. FIG. 4B is a partially enlarged view showing the brush configuration of the head portion in the first embodiment. Note that FIG. 4B is an enlarged view of a region surrounded by a broken line in FIG. Here, one direction in the width direction of the head portion (the direction along the arrangement order of the half-hair bundle portions a1, a2, b1, b2...) Is the +X direction, and the other direction is the −X direction. That is, FIG. 4B shows the hair bundle located on one width direction side (−X side) of the head portion in FIG. 4A.

As shown in FIG. 1, the toothbrush 10 of the present embodiment is formed by integrally molding a handle body 2 and a head portion 3 extending from the handle body 2. The toothbrush of this embodiment is a "wide head specification" toothbrush in which the head portion 3 is wide. The "wide head specification" toothbrush has a width dimension (hereinafter simply referred to as a head width) of the head portion 3 in a direction (X direction) intersecting the extending direction (Y direction) of the handle body 2 is 13 mm or more. A toothbrush. The head width of a general toothbrush is 9 mm to 11 mm, which is a wider head width than this.

The head portion 3 of this embodiment has a head width of 13 mm and a head length of 25 mm.
As described above, in the wide-head type toothbrush, the head width is 13 mm or more, for example, 13 mm to 16 mm.

On the other hand, the head length is, for example, 15 mm to 26 mm. If the head portion 3 is too long, the operability in the oral cavity is likely to be impaired, and if it is too short, the number of hair bundles to be transplanted is too small, and the cleaning effect is easily impaired. Therefore, the length dimension of the head portion 3 is set within the above range.

As the thickness of the head portion 3 is smaller, the operability in the oral cavity can be improved, but if it is too thin, the strength of the head portion 3 tends to be insufficient. Therefore, the thickness of the head portion 3 can be determined in consideration of the material of the handle body 2 and the like, and for example, 1.5 mm to 5 mm is preferable, and 2 mm to 3 mm is more preferable.

As shown in FIG. 2, one side of the head portion 3 is a flocking surface 3a, and a plurality of hair bundles are planted. The bristles 3a of the head portion 3 of the present embodiment are provided with a brush 4 constituted by a bunch of hairs having three height differences.

In the brush 4 of the head portion 3, a plurality of outer bristle bundles A made of bristle of any height and bristles having the highest height in one bristle bundle have the highest height in the outer bristle bundle A. It is configured by a stepped hair bundle composed of an inner hair bundle B having a height lower than that of the hair for use.

The plurality of outer hair tufts A are provided so as to surround the inner hair tuft group 12 by being planted in the respective tufting holes 5 provided on the peripheral edge of the tufting surface 3a, and constitute the outer hair tuft group 11. There is.
The plurality of inner tufts B are planted in the plurality of tufting holes 6 provided in the center of the tufting surface 3a, and constitute the inside tuft bundle group 12. In the present embodiment, the flock holes 5, 6 are arranged in a grid pattern.

In the toothbrush 10 of the present embodiment having the wide head specification, the distance L between the outer hole edge and the hole edge of the two flocked holes 5, 5 existing on the outermost sides in the width direction of the head portion 3 is 11 mm, or That is all. It is preferably 12 mm or more.

In addition, the flocked region surrounded by connecting the edges of the plurality of flocked holes 5 provided on the periphery of the head portion 3 is 1.5 cm ² or more. Preferably 2.0 cm ² or more, further preferably 2.2 cm ² or more. When the flocked area is less than 1.5 cm ² , the effect of polishing the cleaning portion over a wide area cannot be obtained.

The outer hair bundle A has a half-hair bundle portion a1 and a half-hair bundle portion a2 having different hair lengths. The inner bristle bundle B also has a half bristle bundle portion b1 and a half bristle bundle portion b2 having different hair lengths.

In the brush 4 of the present embodiment, the bristle length of the half bristle bundle portion a2 of the outer bristle bundle A and the bristle length of the half bristle bundle portion b1 of the inner bristle bundle B are equal to each other, and there are three levels of difference in bristle length. Is provided. In this way, by making the hair lengths different within one hair bundle in both the outer hair bundle group 11 and the inner hair bundle group 12, that is, the half-hair bundle portion a1 has more hair than the half-hair bundle portion b1. Since the length is long, a concave shape that is recessed toward one surface of the head portion 3 toward the center is generally formed.

In the present embodiment, as shown in FIGS. 2 and 3, the outer bristle bundle A has a height difference between one half bristle bundle portion a1 and the other half bristle bundle portion a2 that sandwich the flat wire 7, respectively. It consists of planted hair. In addition, each of the plurality of inner bristle tufts B is also configured by the bristle that is planted with a height difference between the one half bristle bundle portion b1 and the other half bristle bundle portion b2 that sandwich the flat line 7 therebetween. There is.

Specifically, the flat wire 7 is sandwiched between the hair bundles that are folded in half, and the flat wire 7 is driven into the hair-implanting holes 5 (hair-implanting holes 6), so that the hair bundles are applied to the hair-implanting surface 3a of the head portion 3. It has been planted. In this embodiment, as shown in FIG. 2, all the flat lines 7 are driven into the hair-implanting holes 5 (hair-implanting holes 6) in a state of being inclined at a predetermined angle with respect to the longitudinal direction of the head portion 3. There is. The orientation of each flat line 7 is unified.

The angle of the flat line 7 is not particularly limited, but is preferably 0 degree or more and 45 degrees or less with respect to the head length direction. If the angle is 45 degrees or more, it becomes difficult to form a fine step having a hollow shape from the outer side to the inner side in the head width direction of the head portion 3.

Of the hair bundles folded in two in the inner hair bundle B, one is defined as a half-hair bundle part b1 and the other is defined as a half-hair bundle part b2 with the flat line 7 as a boundary (FIG. 3). The half-hair bundle part b1 and the half-hair bundle part b2 are formed with the flat wire 7 interposed therebetween. As described above, the hair lengths of the half-hair bundle part b1 and the half-hair bundle part b2 are different from each other, and the half-hair bundle part b1 has a longer hair length than the half-hair bundle part b2 (Fig. 4).

In the outer hair bundle A, one of the folded hair bundles with the flat line 7 as a boundary is defined as a half-hair bundle portion a1 and the other is defined as a half-hair bundle portion a2 (FIG. 3). The half-hair bundle portion a1 and the half-hair bundle portion a2 are formed with the flat wire 7 interposed therebetween. As described above, the hair lengths of the half-hair bundle portion a1 and the half-hair bundle portion a2 are different from each other, and the half-hair bundle portion a1 has a longer hair length than the half-hair bundle portion a2 (Fig. 4).

The bristles forming the inner bristle tuft B are 8.5 mil both-end ST bristles (tapered bristles whose diameter gradually decreases toward the bristle tips), and the bristle length t(b1) of the semi-bristle tuft b1 is 10. It is 5 mm and the hair length t(b2) of the half-hair bundle part b2 is 9.5 mm.

The hairs constituting the outer hair bundle A are 7.5 mil both-end ST hairs, and the hair length t(a1) of the half hair bundle a1 is 11.5 mm, and the hair length t(a2) of the half hair bundle a2 is It is set to 10.5 mm.

The relationship between the hair lengths of the semi-hair bundles a1, a2, b1, b2 in the inner hair bundle B and the outer hair bundle A satisfies t(a1)>t(a2)=t(b1)>t(b2). Therefore, the hair lengths of the half-hair bundle portion a2 of the outer hair bundle A and the half-hair bundle portion b1 of the inner hair bundle B are equal. The hair length difference M1 between the half-hair bundle part a1 and the half-hair bundle part a2 is 1 mm, and the hair length difference M2 between the half-hair bundle part b1 and the half-hair bundle part b2 is also 1 mm.

The hair bundle diameters of the respective half-hair bundle portions a1, a2, b1, b2 are all 1.6 mm in diameter.

As shown in FIG. 2, all the hair bundles including the outer hair bundles A and the inner hair bundles B are planted at regular intervals in a lattice pattern in the hair planting area, and the width direction of the head portion 3 (X direction). 6 rows of hairs and 9 rows of hairs in the longitudinal direction (Y direction).

In the wide-head toothbrush 10 of the present embodiment, a part of the bristles forming the outer bristle bundle A located at the outermost periphery of the head portion 3 (half bristle bundle part a1) constitutes the inner bristle bundle B. It is set longer than a part of the bristles (half bristles b1), and the outer bunch A is generally set to be longer than the bristles of the inner bunch B. As a result, the center of the brush 4 has a concave shape, and as a result, the entire brush encloses the teeth during brushing. Therefore, the specifications are such that the bristle tips of the brush 4 easily reach a gap such as between teeth.

Specifically, among the hair bundles that are planted on the head portion 3, the portion 15 (the portion surrounded by the broken line in FIG. 2) arranged in the head length direction of the outer hair bundle group 11 is the tooth neck portion. The part 14 arranged in the head width direction of the outer bristle bundle group 11 (the part surrounded by the broken line in FIG. 2) plays the role of cleaning the interdental part. On the other hand, the inner tuft bundle 12 supports the teeth and plays a role of cleaning the tooth surface.

In such a wide-head toothbrush 10, if the bristles forming the brush 4 are provided with three levels of height difference, the bristles only come into wide contact with the cleaning site in the oral cavity. In addition, it is possible to secure high cleanability for each cleaning part.

Compared with the case where the difference in bristle length within the brush 4 is two stages, that is, the outer bristle bundle A and the inner bristle bundle B are each composed of a regular "half-folded" bristle bundle, the present embodiment Since the toothbrush 10 in the form has a difference in bristle height within the brush 4 in three stages, it is possible to make the center of the brush 4 recessed while having a smoother cushioning property against pressure. For this reason, it is possible to obtain a more gentle contact feeling, and it is possible to provide the tip of the hair to fit fine irregularities on the cleaning portion.

In a general wide-headed toothbrush, the bunch of hair hits the peripheral area other than the desired place to be brushed, so that physical interference easily occurs in one head unit 3 and it is possible to prevent a gap between a plurality of adjacent gaps having different shapes. At the same time, it is difficult to apply the hair tips.

On the other hand, according to the toothbrush 10 of the present embodiment, it is possible to simultaneously clean a plurality of cleaning parts with a wide head specification, and to fit the bristle tips to various gap shapes of the cleaning parts in the oral cavity. And high cleaning performance can be obtained.
As described above, the functional feature of the toothbrush 10 is that the bristles of the brush 4 hit the cleaning site in the oral cavity in a wide range, so that the gap between the teeth and the neck of the tooth can be improved while adjusting the “cleaning efficiency”. Is a point that can be polished with high precision.

In addition, in the present embodiment, hairs thicker than the outer hair bundle A are used as the hairs forming the inner hair bundle B. This is because the inner bristle tuft B preferentially hits the tooth surface, so that it is necessary to firmly support the tufted portion. On the other hand, the outer bristle tuft A needs to be made more flexible so that the bristle tips reach the gap in the cleaning portion, and thus the outer tuft of tufts A is made up of thinner hair than the inner tuft of hair B.

Although the brush 4 configured by a bunch of hairs having three levels of height difference is provided on the flocked surface 3a of the head portion 3 of the present embodiment, the present invention is not limited to this. It is sufficient that at least three height differences are provided on the flocked surface 3a, and four or more height differences may be provided.

The shapes of the hair-implanted holes 5, 6 are not particularly limited, and examples thereof include a circle such as a perfect circle or an ellipse, and a polygon such as a triangle or a quadrangle. In addition, the number of flocked holes 5 and 6 in the entire head portion 3 is not particularly limited, and is, for example, 40 to 60 holes. However, in this embodiment, the maximum number of holes forming one row in the width direction (X direction) of the head portion 3 is five. That is, in the longitudinal direction (Y direction) of the head portion 3, most of the bunch bundle rows forming the brush 4 are rows having five holes in the width direction (X direction) of the head portion 3.

It should be noted that most of the plurality of hair bundle rows forming the brush 4 in the longitudinal direction of the head portion 3 (Y direction) have a maximum number of holes of 6 or more forming one row in the width direction of the head portion 3 (X direction). Is more preferable. When there are many rows in the head portion 3 that have a maximum number of holes of 4 or less forming one row in the width direction (X direction) of the head portion 3, the outer bristle bundle A and the inner bristle bundle B do not play a role. Be clear.

Further, the diameters of the hair transplant holes 5 and 6 are determined according to the desired thickness of the hair bundle, and are, for example, 1 to 3 mm.

Further, the arrangement pattern of the tuft holes 5, 6 is not limited to the arrangement pattern described above. Any arrangement pattern can be used as long as it can form the brush 4 having a concave shape in the head portion 3.
As shown in FIGS. 2 and 4A, in the configuration of the present embodiment, the semi-hair bundle portion a2 of the outer hair bundle A and the inner hair bundle B having the same hair length on the head width direction −X side. The half-hair bundle part b1 and the half-hair bundle part b1 of the outer hair bundle A have a shorter hair length than the one half-hair bundle part b1 of the inner hair bundle B. It is not limited to this as long as it is secured for a long time.

Specifically, in addition to the above, there are three types of array patterns of this embodiment. For example, the half-hair bundle portion a1 of the outer hair bundle A and the half-hair bundle portion b1 of the inner hair bundle B may be opposed to each other, or the half-hair bundle portion a1 of the outer hair bundle A and the half-hair portion of the inner hair bundle B may be opposed to each other. The tuft b2 may be opposed to each other, or the semi-tuft b2 of the inner tuft B and the semi-tuft a2 of the tuft may be opposed to each other.

Of the half-hair bundle portions a1 and half-hair bundle portions a2 of the outer hair bundle A, and the half-hair bundle portions b1 and half-hair bundle portions b2 of the inner hair bundle B, any one of the half-hair bundle portions a1, a2, b1, Whether the b2s face each other can be appropriately selected.

In the four arrangement patterns described above, the half bristle bundle portion a1 of the outer bristle bundle A is longer than the bristle length of the half bristle bundle portion b1 of the inner bristle bundle B. Therefore, macroscopically, in the head width direction of the toothbrush. The central part of the brush has a hollow shape, and the entire brush wraps the teeth during brushing, ensuring that the bristle tips easily reach the gap. Therefore, there is no clear difference in usability and functional aspect between the factional patterns.

In addition, the hole diameter (hair bundle diameter) of the flocked hole is not particularly limited. However, since the outer tuft of hair A needs to have high penetration into the gap, it is desirable that the diameter of the tufting hole is 1.0 mm to 1.6 mm. Further, since the inner tufts of hair B are required to clean the tooth surface and support the teeth, it is desirable that the diameter of the tufting hole is 1.4 mm to 2.0 mm.

Although the hair diameter of each hair bundle is not particularly limited, the outer hair bundle A is required to have high invasion into the gap, and therefore, it is preferably 4 mil to 8 mil capable of ensuring flexibility. Further, since the inner hair bundle B needs to clean the tooth surface and support the teeth, it is desirable that the inner hair bundle B has a rigidity of 6 mil to 10 mil.

Further, the step difference within the same hair bundle is 0.5 mm to 3 mm, more preferably 1 mm to 2 mm. If there are too few steps, the cushioning property deteriorates, and it is difficult to obtain a gentle contact feeling against the gums. If the step is too large, it is difficult to secure the rigidity of the tips of the hairs that enter the gap, and the cleaning property is deteriorated.

The hair length difference between the half-hair bundle portion a1 of the outer hair bundle A and the half-hair bundle portion b1 of the inner hair bundle B is preferably 0.5 mm to 2 mm. If the bristle length difference is too small, the recessed portion from the outer circumference to the center of the head portion 3 becomes shallow, and it is impossible to wrap the teeth and allow the tips of the outer tufts A to reach the gaps. On the other hand, if the hair length difference between the half-hair bundle portion a1 and the half-hair bundle portion b1 is too large, the concave portion formation becomes too deep, and the fitness of the hair tips along the tooth shape deteriorates.

[Second Embodiment]
Next, a toothbrush of the second embodiment of the present invention will be described.
The basic configuration of the toothbrush 20 of the present embodiment described below is substantially the same as that of the first embodiment, but is different in that the height difference of the brush is four stages. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for the description, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 5A is a diagram schematically showing the configuration of the head unit in the second embodiment. FIG. 5B is an enlarged view of a region surrounded by a broken line in FIG. 5A, and shows a hair bundle located on one side (−X side) in the width direction of the head portion.
As shown in FIGS. 5A and 5B, the toothbrush 20 of the present embodiment is configured such that the outer bristle bundle A has a half bristle bundle portion a1 and a half bristle bundle portion a2, and the inner bristle bundle B has a half bristle portion. The hair bundle portions b1 and the semi-hair bundle portions b2 have different hair lengths. In this embodiment, the hair lengths t(a1), t(a2), t(b1), and t(b2) of the half-hair bundles a1, a2, b1, b2 are t(a1)>t(a2). The relationship of >t(b1)>t(b2) is satisfied.

Specifically, as in the first embodiment, the hair length t(a1) of the half-hair bundle part a1 that constitutes the outer hair bundle A is 11.5 mm, and the hair length t(a2) of the half-hair bundle part a2 is It is set to 10.5 mm. On the other hand, the hair length t(b1) of the half-hair bundle part b1 which comprises the inner hair bundle B of this embodiment is 9.5 mm, and the hair length t(b2) of the half-hair bundle part b2 is 8.5 mm.

In this way, the hair length differences M1, M2, M3 between the half-hair bundles a1, a2, b1, b2 are equal, and here the hair length difference is 1 mm.

By making the bristle lengths of all the half bristle bundles a1, a2, b1, b2 that form the outer bristle bundle A and the inner bristle bundle B different, a cushion against a pressure load as compared with the toothbrush 20 of the first embodiment. As a result, the toothbrush 10 having an improved property and a more comfortable touch can be obtained.

Further, the cushioning property is improved as the number of steps of the brush 4 formed by offset flocking in which a step is provided in one hair bundle increases. Therefore, even if the tips of the bristles forming each bunch do not match the shape of the cleaning portion, the flexibility of the tips of the brushes 4 and the cushioning property are used to flexibly perform the cleaning. It is possible to fit the tips of the hair.

[Third Embodiment]
Next, a toothbrush according to the third embodiment of the present invention will be described.
In the basic configuration of the toothbrush 30 of the present embodiment described below, the height difference of the brushes is four levels as in the second embodiment, but the inner bristle bundle B is less than the half bristle bundle portion a2 of the outer bristle bundle A. The difference is that the half-hair bundle portion b1 has a longer hair length, and the difference in hair length within one hair bundle is 2 mm. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for the description, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 6A is a diagram schematically showing the configuration of the head unit in the third embodiment. FIG. 6B is an enlarged view of a region surrounded by a broken line in FIG. 6A and shows a hair bundle located on one side (−X side) in the width direction of the head portion.
In the toothbrush of the second embodiment described above, the bristle length difference in the outer bristle bundle and the inner bristle bundle is 1 mm, respectively, whereas the toothbrush 30 of the present embodiment has the bristle length difference in each bristle bundle. Are 2 mm each.

As shown in FIGS. 6(a) and 6(b), although the inner hair bundle B has a shorter hair length than the outer hair bundle A as a whole, the semi-hair bundle part b1 of the inner hair bundle B has the outer hair bundle A. Is shorter than the half-hair bundle portion a2 of the inner hair bundle B, and the half-hair bundle portion b2 of the inner hair bundle B is shorter than the half-hair bundle portion a2 of the outer hair bundle A. That is, the hair lengths t(a1), t(b1), t(a2), t(b2) of the half-hair bundles a1, a2, b1, b2 are t(a1)>t(b1)>t( The relationship of a2)>t(b2) is satisfied.

Specifically, the hair length t(a1) of the half-hair bundle part a1 that constitutes the outer hair bundle A is 11.5 mm, and the hair length t(a2) of the half-hair bundle part a2 is 9.5 mm. On the other hand, the hair length t(b1) of the half-hair bundle part b1 that constitutes the inner hair bundle B of this embodiment is 10.5 mm, and the hair length t(b2) of the half-hair bundle part b2 is 8.5 mm.

As described above, in the present embodiment, the hair length difference M1 between the half hair bundles a1 and a2 of the outer hair bundle A is 2 mm, and the hair length difference M2 between the half hair bundles b1 and b2 of the inner hair bundle B is also equal to each other. It is set to 2 mm. Although the hair lengths of all the half-hair bundle portions a1, a2, b1, b2 are the same as in the second embodiment, the height difference in one hair bundle is as long as 2 mm.

As a result, the semi-bristle bundles a1 and a2 in the outer bristle bundle A and the semi-bristle bundles b1 and b2 in the inner bristle bundle B project from each other by a large amount, and thus the flexibility of the bristle tips in the entire brush 4 is increased. The cushioning property is increased, and the cleaning property to the gap and the gentle touch feeling are improved.

[Fourth Embodiment]
Next, the toothbrush of 4th Embodiment of this invention is demonstrated.
The basic configuration of the toothbrush of the present embodiment described below is different in that the difference in height between the brushes is three levels, which is substantially the same as in the first embodiment, except that the outer bristle bundles have the same bristle length. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for the description, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 7A is a diagram schematically showing the configuration of the head unit in the fourth embodiment. FIG. 7B is an enlarged view of a region surrounded by a broken line in FIG. 7A, and shows a hair bundle located on one side (−X side) in the width direction of the head portion.
As shown in FIGS. 7(a) and 7(b), in the toothbrush 40 of the present embodiment, all of the bristles forming the outer bristle bundle A have the same bristle length, and the bristle lengths of the half bristle bundle portions a1 and a2 are equal to each other. It is said to be the same. In other words, the tufts of hair are planted in equal folds. Specifically, the hair lengths t(a1), t(a2), t(b1), t(b2) of the half-hair bundles a1, a2, b1, b2 are t(a1)=t(a2) >t(b1)>t(b2).

Specifically, both the hair length t(a1) of the half-hair bundle part a1 and the hair length t(a2) of the half-hair bundle part a2 that form the outer hair bundle A are set to 11.5 mm. The hair length t(b1) of the half-hair bundle part b1 that constitutes the inner hair bundle B is 10.5 mm, and the hair length t(b2) of the half-hair bundle part b2 is 9.5 mm.

As described above, in the toothbrush 40, the outer bristle tufts A of the head portion 3 are composed of straight bristles, but the half bristle tufts a1 and a2 of the outer tufts A are each half tufts of the inner tuft B. Since it is longer than the portions b1 and b2, when viewed macroscopically, the central portion has a recessed shape in the head width direction. Therefore, at the time of brushing, the brush 4 as a whole wraps the teeth so that the bristle tips easily reach the gap.

[Fifth Embodiment]
Next, the toothbrush of 5th Embodiment of this invention is demonstrated.
The basic configuration of the toothbrush of the present embodiment described below is different from that of the first embodiment in that the height difference between the brushes is three levels, but the bristles of the inner bristle bundle are all the same in height. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. Further, in each drawing used for the description, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 8A is a diagram schematically showing the configuration of the head unit in the fifth embodiment. FIG. 8B is an enlarged view of a region surrounded by a broken line in FIG. 8A, and shows the hair bundle located on one side (−X side) in the width direction of the head portion.
As shown in FIGS. 8A and 8B, in the toothbrush 50 of the present embodiment, all the bristles forming the inner bristle bundle B have the same bristle length, and the bristle portions b1 and b2 have bristle lengths. It is said to be the same. In other words, the tufts of hair are planted in equal folds. Specifically, the hair lengths t(a1), t(a2), t(b1), and t(b2) of the half-hair bundle parts a1, a2, b1, b2 are t(a1)>t(a2) >t(b1)=t(b2) is satisfied.

Specifically, the hair length t(a1) of the half-hair bundle part a1 that constitutes the outer hair bundle A is 11.5 mm, and the hair length t(a2) of the half-hair bundle part a2 is 10.5 mm. The hair length t(b1) of the half-hair bundle part b1 and the hair length t(b2) of the half-hair bundle part b2 that form the inner hair bundle B are both 9.5 mm.

In the toothbrush 50, the bristle lengths of the half bristle bundles a1 and a2 of the outer bristle bundle A are longer than the bristle lengths of the half bristle bundles b1 and b2 of the inner bristle bundle B. The central portion is recessed in the width direction. For this reason, it is ensured that the entire brush wraps the teeth during brushing and the bristles easily reach the gap.

[Sixth Embodiment]
Next, the toothbrush of 6th Embodiment of this invention is demonstrated.
The toothbrush of the present embodiment shown below is different from the arrangement pattern of the bristle bundles in the first embodiment described above in that the inner bristle bundle group is divided into two by the central bristle bundle group. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. Further, in each drawing used for the description, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals.

FIG. 9: is a top view which shows the structure in the head part 3 of the toothbrush of 6th Embodiment. 10A is a cross-sectional view taken along the line BB′ of FIG. 9, and is a diagram schematically showing the configuration of the head portion in the sixth embodiment, and FIG. FIG. 4A is an enlarged view of a region surrounded by a broken line in FIG. 4B, showing a hair bundle located on one side (+Y side) in the width direction of the head portion. It should be noted that FIG. 10A is slightly different from the accurate cross-sectional view taken along the line BB′ of FIG. 9, but the relationship between the semi-hair bundles in the outer hair bundle and the inner hair bundle (hair length difference) ) Is illustrated in an easy-to-understand manner.
11A is a cross-sectional view taken along the line AA′ in FIG. 9, and FIG. 11B is an enlarged view of a region surrounded by a broken line in FIG. The hair bundle located on one side (-X side) in the direction is shown.

As shown in FIG. 9, the toothbrush 60 of the present embodiment has a central bristle bundle group 13 that separates the inner bristle bundle group 12 into two in the longitudinal direction of the head portion 3.

The head portion 3 includes an outer bristle tuft group 11 arranged on the outer periphery of the head portion 3, a central bristle tuft group 13 that forms a row across the head width direction at a longitudinal center position, an outer bristle tuft group 11 and a central bristle tuft. It has two inner hair bundle groups 12, 12 surrounded by a bundle group 13. The hair bundle configurations of the outer hair bundle A and the inner hair bundle B are the same as those in the first embodiment.

The central bristle bundle group 13 is composed of a plurality of central bristle bundles C having the same configuration as the outer bristle bundle A, and as shown in FIGS. 10(a) and 10(b), the half bristle bundle portions c1 and c2 are The hair lengths t(c1) and t(c2) have a relationship of satisfying t(c1)>t(c2). Specifically, the hair length t(c1) of the half-hair bundle portion c1 of the central hair bundle C is 11.5 mm, and the hair length t(c2) of the half-hair bundle portion c2 is 10.5 mm.

In this way, the central bristle bundle group 13 connects the two outer bristle bundles A located on both outer edge sides in the head width direction so as to form a row between them, so that the inner bristle bundle groups 12 and 12 This is the same as surrounding by the outer bundle of hair groups 11. As a result, two recessed recesses are formed in the longitudinal direction of the head portion 3. Therefore, at the time of brushing, each recessed portion fits so as to wrap around one tooth.

According to the toothbrush 60 of the present embodiment, the central bristle bundle group 13 increases the number of bristle bundles responsible for interdental cleaning, and the hollow region of the outer bristle bundle group 11 shrinks to about 1 tooth, resulting in a larger gap. The fit property to the hair tips will be increased.

In the present embodiment, only one row of hair bundle groups configured by the plurality of central hair bundles C is provided, but a plurality of rows may be provided.

In addition, the configuration including the central hair bundle C of the present embodiment can be appropriately applied to other embodiments.

[Seventh Embodiment]
Next, the toothbrush of 7th Embodiment of this invention is demonstrated.
In the basic configuration of the toothbrush of the present embodiment described below, the bristles forming the outer bristle tufts are ST bristles, but the bristles forming the inner bristle tufts are straight bristles, as in the first embodiment. They differ in points. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for description, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals.

FIG. 12A is a diagram schematically showing the configuration of the head portion in the seventh embodiment. FIG. 12B is an enlarged view of a region surrounded by a broken line in FIG. 12A, and shows the hair bundle located on one side (−X side) in the width direction of the head portion.
As shown in FIGS. 12A and 12B, in the toothbrush 70 of the present embodiment, as in the first embodiment, the outer bristle bundle A uses tapered bristles whose diameter gradually decreases toward the bristle tips. However, as the inner bristle tuft B, straight bristles having substantially the same diameter except for the rounded portion of the bristle tips are used.

According to the toothbrush 70 of the present embodiment as described above, since the half bristle bundle portions b1 and b2 of the inner bristle bundle B are both configured by straight bristles, the contact area of the tip of the bristle with respect to the tooth surface increases, and The surface cleaning property is improved.

[Eighth Embodiment]
Next, the toothbrush of 8th Embodiment of this invention is demonstrated.
The basic structure of the toothbrush of the present embodiment described below is substantially the same as that of the first embodiment, except that the outer bristle bundles are composed of straight bristles and ST bristles, and the inner bristles are composed of straight bristles. The difference is that. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for description, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals.

FIG. 13A is a diagram schematically showing the configuration of the head portion in the eighth embodiment. FIG. 13B is an enlarged view of a region surrounded by a broken line in FIG. 13A, and shows a hair bundle located on one side (−X side) in the width direction of the head portion.

As shown in FIGS. 13A and 13B, in the toothbrush 80 of the present embodiment, only the half bristle bundle portion a1 of the outer bristle bundle A having the longest bristle length among the bristle bundles constituting the brush 4 is ST. The bristles are the bristles, and the other half bristles a2, b1, b2 are straight bristles. That is, each of the half-hair bundle part b1 and the half-hair bundle part b2 of the inner hair bundle B is composed of straight bristles. The outer bristle tuft A is planted with a flat wire 7 sandwiched by folding one end ST bristles having one end sharpened into two.

According to the toothbrush 80 of the present embodiment, since the bristle tips of the half bristle bundle portion a1 having the longest bristle length are sharpened, high clearance cleanability is ensured. On the other hand, since the other half-hair bundles a2, b1, b2 are all straight bristles, the contact area with the tooth surface is increased and the tooth surface cleaning efficiency is improved.

[Ninth Embodiment]
Next, a toothbrush according to the ninth embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment described below is substantially the same as that of the first embodiment, but is different in that all the bristles forming the brush are made of straight bristles. Therefore, in the following description, different points will be described in detail, and description of common points will be omitted. In addition, in each drawing used for description, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals.

FIG. 14A is a diagram schematically showing the configuration of the head portion in the ninth embodiment. FIG. 14B is an enlarged view of a region surrounded by a broken line in FIG. 14A, and shows a hair bundle located on one side (−X side) in the width direction of the head portion.

As shown in FIGS. 14A and 14B, in the toothbrush 90 of this embodiment, all the bristles forming the brush 4 are straight bristles. That is, all of the half-hair bundle portions a1 and a2 of the outer hair bundle A and the half-hair bundle portions b1 and b2 of the inner hair bundle B are all composed of straight hairs.

According to the toothbrush 90 of the present embodiment, since all the half bristle bundle portions a1, a2, b1, b2 in the outer bristle bundle A and the inner bristle bundle B are composed of straight bristles, the contact area with the tooth surface increases. The tooth surface cleaning efficiency is further improved. Further, since the toothbrush 90 has a shape in which the central portion is dented when viewed macroscopically, it is ensured that the entire brush encloses the tooth during brushing and the bristle tips easily reach the gap.

As described above, according to the wide head specification toothbrush in each of the embodiments, it is possible to polish a plurality of cleaning portions with a large number of bristle bundles, so that the cleaning efficiency is excellent and a gentle contact feeling against the gums is obtained. You can

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to the following description.

(Production of Toothbrushes of Examples 1 to 9 and Comparative Examples 1 to 4)
Based on the specifications shown in Table 1, toothbrushes D1 to D9 of Examples 1 to 9 based on the above-described first to ninth embodiments were produced. Here, in each example, two to four types of toothbrushes D1(1) to D9(4) having different hair bundle arrangement patterns were prepared.
Further, toothbrushes E1 to E4 of Comparative Examples 1 to 5 were produced based on the specifications shown in Table 2. Also in the comparative example, one kind or plural kinds of toothbrushes E1(1) to E4(4) were prepared.

As shown in Table 2, in the toothbrush E1 of Comparative Example 1, the outer bristle bundle A and the inner bristle bundle B are both 11.5 mm and have the same bristle length.
In the toothbrush E2 of Comparative Example 2, the inner bristle bundle B has a shorter bristle length than the outer bristle bundle A, and both bristle bundles A and B are configured by bristles having the same bristle length in the same bristle bundle. ing. Specifically, the half-hair bundle portions a1 and a2 of the outer hair bundle A are 11.5 mm, and the half hair bundle portions b1 and b2 of the inner hair bundle B are 10.5 mm.
In the toothbrush E3 of Comparative Example 3, the outer bristle bundle A and the inner bristle bundle B have the same configuration, one half bristle bundle portions a1 and b1 are 11.5 mm, and the other half bristle bundle portions a2 and b2 are 10. It is 5 mm.
The toothbrush E4 of Comparative Example 4 is based on the configuration of Example 1(1), has a head width of 12 mm, and has four bristles arranged in the head width direction and nine bristles arranged in the head length direction.

Here, each of the toothbrushes D1 to D9 of Examples 1 to 9 and the toothbrushes D1 to D4 of Comparative Examples 1 to 4 was evaluated for cleanability between teeth and tooth necks, and gentle contact feeling against gums.

For the evaluation, 10 monitors cleaned the inside of the oral cavity with the toothbrush of each example, and the evaluation at that time was evaluated according to the following criteria.

10 monitors have an average score of 6.0 or more ◎+, 5.5 or more ◎, average 5.0 or more ◯+, average score 4.5 or more ◯, average score 4.0 or more ◯−. The average point of 3.5 or more was Δ, the average point of 3.0 or more was Δ-, and the average point of less than 3.0 was x. The evaluation criteria are as follows.

The "feel of removing dirt between the teeth and the neck of the tooth" when compared with Comparative Example 1 is evaluated.
7 points: Very strong, 6 points: Strongly felt, 5 points: Feeled, 4 points: Equal, 3 points: Not so much, 2 points: Not felt, 1 point: Not felt at all (same in other evaluations) )

The results are shown in Tables 1 and 2.

As shown in Table 1, under the conditions shown in Example 1, the interdental and cervical cleanability and the gentle contact with the gums were evaluated better than the comparative examples. In the patterns (1) to (4), when viewed macroscopically, the hair length of the half hair bundle a1 of the outer hair bundle A (>the hair length of the half hair bundle a2) is half of that of the inner hair bundle B. Since it is longer than the hair length of the hair bundles b1 and b2, it has a shape in which the central portion is recessed in the head width direction. Therefore, it is ensured that the entire brush wraps the teeth during brushing and the bristle tips easily reach the gap. Therefore, there is no clear difference in usability and function between the derived patterns.

Under the conditions shown in Example 2, the cleanability between the teeth and the cervical part was good, and the contact feeling against the gums was particularly good. The toothbrush D2 of Example 2 has different bristle lengths among all the half bristle bundle portions a1, a2, b1, b2, which increases the cushioning property against pressure load as compared with Example 1 and provides a gentle contact feeling. Improved. There is no clear difference in usability and function between the derived patterns in the second embodiment.

Under the conditions shown in Example 3, particularly good results were obtained regarding the cleaning property between the teeth and the cervical part. In addition, good results were also obtained with respect to the gentle touch to the gums.
The toothbrush D3 of Example 3 is the same as that of Example 2 in that the bristle lengths of all the half bristle bundles a1, a2, b1, b2 are different, but the half bristle bundle b1 is more than the half bristle bundle a2. Is different in that it has a long hair length and a step difference of 2 mm within the same hair bundle. In particular, the latter is different in terms of use and function, and since the protruding amount of the semi-hair bundle is large, the freedom of movement of the tips of the hair and the cushioning property are increased, and the cleanability to the gap and the gentle touch feeling are improved. improves.

Under the conditions shown in Examples 4 and 5, good results were obtained as compared with the comparative example in terms of the cleaning property between the teeth and the cervical part, and the gentle contact feeling against the gums.
In the toothbrushes D4 and D5, either the outer bristle bundle A or the inner bristle bundle B is planted by “equal-folding”, and there is no step in each bristle bundle.
When viewed macroscopically in the entire brush, the hair length of the half-hair bundle portion a1 (>the hair length of the half-hair bundle portion a2) is longer than the hair length of the half-hair bundle portions b1 and b2. The central part has a hollow shape. For this reason, it is ensured that the entire brush wraps the teeth during brushing and the bristle tips easily reach the gap.

Under the conditions shown in Example 6, the cleanability between the teeth and the cervical part was particularly good, and good results were also obtained with respect to the gentle contact feeling against the gums.
The toothbrush D6 has a central bristle bundle C in addition to the outer bristle bundle A and the inner bristle bundle B. The central hair bundle C increases the number of hair bundles responsible for interdental cleaning. In addition, the recessed area of the inner bristle tuft B that is divided into two in the head length direction is contracted to approximately one tooth, so that the tip fitting property in the gap is further improved.

Under the conditions shown in Example 7, the cleanability between the teeth and the cervical part is good, but the comfort of contact with the gums is slightly reduced. This is because the inner bristle tuft B is composed of straight bristles at both ends in the toothbrush D7, but since a step is provided in the brush by the offset tufting, and the tuft is a portion responsible for tooth surface cleaning. , A gentle feeling of contact with the gums is secured compared to the comparative example.

Even under the conditions shown in Example 8, the cleanability between the teeth and the cervical part is good, but the comfort of contact with the gums is slightly reduced. In the toothbrush D8, only the half bristle bundle portion a1 of the outer bristle bundle A is ST bristle, and the other half bristle bundle portions a2 and the half bristle bundle portions b1 and b2 of the inner bristle bundle B are both straight bristles. .. Therefore, as compared with the toothbrush of all the other examples in which all the tips of the bristles are made of ST bristles, the penetrability into the gap and the gentle contact with the gums are inferior. However, since the hair tips of the semi-hair bundle part a1 of the outer hair bundle A having the longest hair length are sharpened, the penetration into the gap is higher than in Comparative Examples 1 to 4.

In the conditions shown in Example 9, based on the conditions of Example 1, since all the semi-hair bundle parts a1, a2, b1, b2 in the outer hair bundle A and the inner hair bundle B are composed of straight hairs, Cleanability of the gap decreases. However, since the toothbrush D9 has a hollow central portion when viewed macroscopically, the toothbrush D9 encloses the teeth with the entire brush during brushing and the bristles easily reach the gap.

Under the conditions shown in Comparative Example 1, since the outer hair bundle A and the inner hair bundle B have the same hair length, the cleaning property between the teeth and the cervical part and the gentle contact feeling on the gums are inferior to those of the examples. It was

Under the conditions shown in Comparative Example 2, although the outer bristle bundle A and the inner bristle bundle B have different bristle lengths, since they are planted in equal folds, the step formation of the entire brush is in two steps. Therefore, although the gap cleanability and the comfort of contact with the gums were improved as compared with Comparative Example 1, the results were inferior to the above Examples.

Under the conditions shown in Comparative Example 3, since the outer hair bundle A and the inner hair bundle B have the same hair bundle configuration and the half hair bundle portions are planted with the same step width, the step shape of the entire brush is formed. There are two stages. Therefore, the formation of recesses in the inner hair bundle group was insufficient, and the gap cleaning property and the comfort of contact with the gums were improved as compared with Comparative Example 1, but the results were inferior to those of the above Examples.

Under the conditions shown in Comparative Example 4, only the head width is reduced based on the conditions of Example 1. Specifically, the tufts in the head width direction were arranged in four rows, and the head width was 12 mm. In this case, the cleaning efficiency cannot be improved because the number of hair bundles is small. In addition, the cushioning property is also reduced. For this reason, the cleanability of the gap and the comfort of contact with the gums are considerably inferior to those of the above-mentioned respective examples.

The preferred embodiment of the present invention has been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to the example. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and naturally, the technical scope of the present invention is also applicable to them. Be understood to belong to.

The hole arrangement (lattice/staggered) of the outer hair bundle A and the inner hair bundle B is not particularly limited.
Further, the outer hair bundle A is not limited to one row, and if the head width has a margin, the hair bundle diameter may be adjusted and then a plurality of rows (for example, two rows) may be formed.

In each of the above-described embodiments, both end ST bristles and one end ST bristles/both ends straight bristles are used, but the tip diameters of the both ends ST bristles may be different from each other. Further, the shape of the bristle tips is not limited to this, and the branched bristle tips may be used except for the semi-bristle bundle portion a1 of the outer bristle bundle A having the highest bristle length.

The cross-sectional shape of the bristle is not limited to the circular shape.

2... Handle body, 3... Head part, 3a... Flocking surface, 4... Brush, 5,6... Flocking hole, 7... Flat line, A... Outer hair bundle, B... Inner hair bundle, C... Central hair bundle, 10 , 20, 30, 40, 50, 60, 70, 80, 90, D1 to D9, E1 to E4... Toothbrush, t(a1), t(a2), t(b1), t(b2), t(c1) ), t(c2),... Hair length, a1, a2, b1, b2, c1, c2... Half hair bundle part, M1, M2... Hair length difference

Claims (7)

A head part in which a plurality of hair bundles are respectively implanted in the width direction and the longitudinal direction of the flocked surface, and a handle body extending from the head part,
The dimension of the head portion in the width direction intersecting the extending direction of the handle body is 13 mm or more, and the number of the hair bundles forming one row in the width direction is 5 or more at the maximum,
The head portion is an outer bristle bundle composed of bristles of any height,
A bristle having the highest height in one tuft and an inner tuft that is lower in height than the highest bristles in the outer tuft;
A plurality of the outer hair bundles arranged on the outer periphery of the head portion are provided so as to surround the plurality of inner hair bundles arranged in the center of the head portion,
The outer hair bundle and the inner hair bundle are planted by inserting the flat wire sandwiched between the two folded hair bundles into the hair transplant holes formed in the hair transplant surface, and sandwiching the flat wire. Each has two half-hair bundles formed,
In the one hair bundle, the outer hair bundle has one of the half-hair bundle portions composed of the plurality of hairs having a first height and a second height lower than the first height. Between the other half hair bundle part consisting of the plurality of hairs having,
The inner bristle bundle has, within one bristle bundle, the one half bristle bundle portion composed of the plurality of bristle having a third height, and a fourth height lower than the third height. A step of 1 mm or more is provided between each of the other half hair bristles formed of the plurality of bristles, and
Between the outer bristle bundles arranged in a plurality in the width direction of the head portion, between the inner bristle bundles, the one half bristle bundle portion having a long bristle length, and the other of the short bristle bundles Half-hair bundle part, and are lined up alternately in the arrangement direction,
One of the half-hair bundle portions of the plurality of outer bristle bundles is equal to each other at the first height, and the other half-hair bundle portion is equal to each other at the second height,
A toothbrush, wherein one of the half bristle bundle portions of the plurality of inner bristle bundles is equal to each other at the third height, and the other half bristle bundle portion is equal to each other at the fourth height. A plurality of central bristle tufts separating the plurality of inner tufts into two in the longitudinal direction of the head portion,
The toothbrush according to claim 1, wherein the bristle length of the central bristle bundle is equal to the bristle length of the outer bristle bundle. The toothbrush according to claim 1 or 2, wherein one half bristle bundle portion of the outer bristle bundle and one half bristle bundle portion of the inner bristle bundle have the same bristle length. The toothbrush according to claim 1 or 2, wherein the half bristle bundle portions of the outer bristle bundle and the half bristle bundle portions of the inner bristle bundle all have different bristle lengths. The toothbrush according to any one of claims 1 to 4, wherein at least one of the outer bristle bundle and the inner bristle bundle includes a plurality of bristles having sharpened bristle tips. The toothbrush according to claim 5, wherein a distance between outer hole edges of the two flocked holes existing on the outermost sides on both sides in the width direction of the head portion is 10 mm or more. The toothbrush according to claim 5 or 6, wherein a flocked region surrounded by connecting the respective hole edges of the plurality of flocked holes located on the outermost side of the head portion is 1.5 cm 2 or more.

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