JP6827096B2 - toothbrush - Google Patents

Description

The present invention relates to a toothbrush.

At present, there are various types of toothbrush heads having various sizes according to the taste and purpose of the user. In terms of oral hygiene, a compact head that "polishs one tooth at a time" is generally suitable, but those who lack the technique of polishing and those who emphasize efficient polishing in a short time. For this purpose, a "wide head type" toothbrush having a wide head portion, which can simultaneously brush the cervical region, the interdental region and the tooth surface, may be suitable.

The problem with this "wide head type" toothbrush is that it can clean multiple cleaning areas at the same time, so cleaning efficiency is high, but the "cleaning accuracy" of each area, especially the gaps between teeth and the cervical region, etc. Regarding the cleaning of parts, it tends to be inferior. This is because the tip of the toothbrush hits the peripheral part other than the place to be brushed, and physical interference is likely to occur.

By the way, in an existing toothbrush of a general size, a configuration has been proposed in which a height difference is provided in the bristles in the brush in order to improve cleaning efficiency (Patent Document 1). This has the advantage that the height of the flocking in the center is shorter than the height of the flocking in the periphery, so that the teeth can be brushed across the dentition. That is, it is possible to polish the upper surface and both side surfaces of one tooth at the same time.

Utility Model Registration No. 3142875

However, it is difficult to brush the cervical region, the space between teeth, and the tooth surface at the same time with a toothbrush of a general size as in Patent Document 1, and a person who attaches importance to efficiently brushing a plurality of cleaning sites in a short time. Cannot 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 wipe a plurality of cleaning parts at the same time with a wide head specification, and to provide high cleaning performance and gentle hitting comfort even for individual gap shapes. With the goal.

The toothbrush according to one aspect of the present invention has a head portion in which a plurality of hair bundles are planted on the bristled surface, and a handle body extending from the head portion, and has a width intersecting the extending direction of the handle body. The size of the head portion in the direction is 13 mm or more, and the head portion has an outer hair bundle composed of hairs of an arbitrary height and the hair having the highest height in one hair bundle. It has an inner hair bundle having a height lower than that of the tallest hair in the outer hair bundle, and a plurality of the outer hair bundles are provided so as to surround the plurality of the inner hair bundles. , The outer hair bundle and at least one of the inner hair bundles are characterized by having two half-hair bundles having different hair lengths from each other.

The toothbrush according to one aspect of the present invention has a plurality of central hair bundles that separate the plurality of inner hair bundles into two in the longitudinal direction of the head portion, and the hair length of the central hair bundle is that of the outer hair bundle. The composition may be equal to the hair length.

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

In the toothbrush according to one aspect of the present invention, the hair lengths of each half-hair bundle portion of the outer hair bundle and each half-hair bundle portion of the inner hair bundle may be different.

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

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

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

In the toothbrush according to one aspect of the present invention, the outer hair follicle and the inner hair follicle are planted by a flat line sandwiched between the folded hair follicles being driven into a hair-implanted hole formed on the hair-implanted surface. The two half-hair bundles may be provided so as to sandwich the flat line.

In the toothbrush according to one aspect of the present invention, the distance between the outer hole edges of the two outermost follicles 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 edge of each 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 wipe a plurality of cleaning parts with a wide head specification, and it is possible to provide a toothbrush having high cleanability and a gentle touch even for individual gap shapes.

The side view which shows the whole structure of the toothbrush in 1st Embodiment. The plan view of the head part which shows the arrangement pattern of a hair bundle. The schematic diagram which shows the hair bundle in the flat line straight hair type. (A) is a diagram schematically showing the configuration of the head portion in the first embodiment, (b) is a diagram showing a partially enlarged brush configuration of the head portion in the first embodiment, (b) is a diagram. , (A) is an enlarged view of the area surrounded by the broken line. (A) is a diagram schematically showing the configuration of the head portion in the second embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the third embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the fourth embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the fifth embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). The plan view which shows the structure in the head part of the toothbrush of 6th Embodiment. FIG. 9A is a cross-sectional view taken along the line BB'of FIG. 9, and FIG. 10B is a diagram schematically showing the configuration of the head portion in the sixth embodiment, and FIG. 10B is a broken line in FIG. 9A. Enlarged view of the area surrounded by. (A) is a cross-sectional view taken along the line AA'of FIG. 9, and FIG. 11 (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the seventh embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the eighth embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a). (A) is a diagram schematically showing the configuration of the head portion in the ninth embodiment, and (b) is an enlarged view of a region surrounded by a broken line in (a).

[First Embodiment]
The toothbrush of the first embodiment according to the present invention will be described below.
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 a head portion showing an arrangement pattern of hair bundles. FIG. 3 is a schematic view showing a hair bundle in the flat line straight hair type. FIG. 4A is a diagram schematically showing the configuration of the head portion 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. 4A. Here, one direction in the width direction of the head portion (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 a hair bundle located on one side (−X side) of the head portion in the width direction in FIG. 4A.

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

The head portion 3 of the present embodiment has a head width of 13 mm and a head length of 25 mm.
As described above, in the wide head specification 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 likely to be impaired. Therefore, the length dimension of the head portion 3 is set within the above range.

The thinner the thickness of the head portion 3, the higher the operability in the oral cavity, 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 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 surface side of the head portion 3 is a flocked surface 3a, and a plurality of hair bundles are planted. A brush 4 composed of hair bundles having three height differences is provided on the flocked surface 3a of the head portion 3 of the present embodiment.

The brush 4 of the head portion 3 has a plurality of outer hair bundles A composed of hairs of an arbitrary height, and the hair having the highest height in one hair bundle has the highest height in the outer hair bundle A. It is composed of a stepped hair bundle composed of an inner hair bundle B having a height lower than that of the hair to be held.

The plurality of outer hair follicles A are provided so as to surround the inner hair follicle group 12 by being planted in each of the hair transplant holes 5 provided on the peripheral edge of the hair transplant surface 3a, forming the outer hair follicle group 11. There is.
The plurality of inner hair follicles B are planted in the plurality of hair-implanted holes 6 provided in the center of the hair-implanted surface 3a to form the inner hair follicle group 12. In this embodiment, the pores 5 and 6 are arranged in a grid pattern.

In the toothbrush 10 of the present embodiment having a wide head specification, the distance L between the outer hole edges and the hole edges in the two outermost flocked holes 5 and 5 on both sides in the width direction of the head portion 3 is 11 mm or that. It is said that it is over. It is preferably 12 mm or more.

Further, the flocked area surrounded by connecting the edges of the plurality of flocked holes 5 provided on the peripheral edge 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. If the flocked area is less than 1.5 cm ² , the effect of polishing the cleaned part 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 from each other. The inner hair bundle B also has a half-hair bundle portion b1 and a half-hair bundle portion b2 having different hair lengths.

In the brush 4 of the present embodiment, the hair length of the half-hair bundle portion a2 of the outer hair bundle A and the hair length of the half-hair bundle portion b1 of the inner hair bundle B are equal to each other, and there are three stages of hair length difference as a whole. Is provided. In this way, by making the hair lengths different in 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 the center toward one side of the head portion 3 is generally formed.

In the present embodiment, as shown in FIGS. 2 and 3, the outer hair bundle A is provided with a height difference between one half hair bundle portion a1 and the other half hair bundle portion a2 sandwiching the flat line 7, respectively. It is composed of planted hair. Further, the plurality of inner hair bundles B are also composed of hairs planted with a height difference between one half hair bundle portion b1 and the other half hair bundle portion b2 sandwiching the flat line 7, respectively. There is.

Specifically, a flat line 7 is sandwiched between the hair follicles folded in half, and the flat line 7 is driven into the flocking hole 5 (flocking hole 6), so that the hair follicle is placed on the flocking surface 3a of the head portion 3. It has been planted. In the present embodiment, as shown in FIG. 2, all the flat lines 7 are driven into the hair follicles holes 5 (hair follicles 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 degrees or more and 45 degrees or less with respect to the head length direction. When the temperature is 45 degrees or more, it becomes difficult to form a fine step in the shape of a depression from the outside to the inside in the head width direction of the head portion 3.

Of the hair bundles folded in half in the inner hair bundle B, one is referred to as a half-hair bundle portion b1 and the other is referred to as a half-hair bundle portion b2 when the flat line 7 is a boundary (FIG. 3). The half-hair bundle portion b1 and the half-hair bundle portion b2 are formed with the flat line 7 interposed therebetween. As described above, the half-hair bundle portion b1 and the half-hair bundle portion b2 have different hair lengths, and the half-hair bundle portion b1 has a longer hair length than the half-hair bundle portion b2 (Fig.). 4).

In the outer hair bundle A, one of the folded hair bundles when the flat line 7 is the boundary is the half hair bundle portion a1, and the other is the 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 line 7 interposed therebetween. As described above, the half-hair bundle portion a1 and the half-hair bundle portion a2 have different hair lengths, and the half-hair bundle portion a1 has a longer hair length than the half-hair bundle portion a2 (FIG. 4).

The hairs constituting the inner hair bundle B are 8.5 mil both end ST hairs (tapered hair whose diameter gradually decreases toward the tip of the hair), and the hair length t (b1) of the half hair bundle portion b1 is 10. The hair length t (b2) of the half-hair bundle portion b2 is 5 mm, and the hair length t (b2) is 9.5 mm.

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

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

The hair bundle diameter of each of the half hair bundle portions a1, a2, b1, b2 is 1.6 mm in diameter.

As shown in FIG. 2, all the hair bundles including the outer hair bundle A and the inner hair bundle B are planted in the flocked region at equal pitch intervals in a grid pattern, and are planted in the width direction (X direction) of the head portion 3. There are 6 rows of hair bundles and 9 rows of hair bundles in the longitudinal direction (Y direction).

In the wide-head specification toothbrush 10 of the present embodiment, a part of the bristles (half bristles a1) forming the outer bristles A located on the outermost periphery of the head portion 3 constitutes the inner bristles B. It is set longer than a part of the hair (half hair bundle portion b1), and the outer hair bundle A is generally set longer than the hair length of the hair for forming the inner hair bundle B. As a result, the center of the brush 4 is recessed in a concave shape, and as a result, the entire brush wraps the teeth during brushing. Therefore, the specifications are such that the bristles of the brush 4 easily reach gaps such as between teeth.

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

In such a wide-head toothbrush 10, if the hair bundles constituting the brush 4 are provided with three levels of height difference, the hair bundles only come into contact with a wide area of the cleaning portion in the oral cavity. However, high cleanability for each cleaning site can be ensured.

This implementation is compared with the case where the difference in hair length in the brush 4 is two stages, that is, the case where the outer hair bundle A and the inner hair bundle B are each composed of the usual "equally folded" hair bundles. In the toothbrush 10 of the form, since the difference in hair height within the brush 4 is set to three stages, it is possible to dent the center of the brush 4 while having a smoother and cushioning property against pressure. Therefore, it is possible to obtain a gentler touch feeling and to impart a hair tip fit to fine irregularities of the cleaning portion.

In a general wide-head toothbrush, hair bundles hit peripheral parts other than the place to be brushed, so physical interference is likely to occur in one head part 3, and for a plurality of adjacent gaps having different shapes. At the same time, it is difficult to hit the ends of the hair.

On the other hand, according to the toothbrush 10 of the present embodiment, it is possible to simultaneously wipe a plurality of cleaning parts with the wide head specification, and the hair tip fits to various gap shapes of the cleaning parts in the oral cavity. Is high, and high cleanability can be obtained.
As described above, the functional feature of the toothbrush 10 is that the bristles of the brush 4 hit a wide range of the cleaning area in the oral cavity, so that the gap between the teeth and the cervical region is adjusted while adjusting the "cleaning efficiency". It is a point that can be polished accurately.

In this embodiment, hair thicker than the outer hair bundle A is used as the hair forming the inner hair bundle B. This is because the inner hair bundle B preferentially hits the tooth surface, so that it is necessary to firmly support the flocked portion. On the other hand, since it is necessary for the outer hair bundle A to reach the gap in the cleaning site with greater flexibility, the outer hair bundle A is configured by using hair thinner than the inner hair bundle B.

The flocked surface 3a of the head portion 3 of the present embodiment is provided with a brush 4 composed of hair bundles having three levels of height difference, but the present invention is not limited to this. It is sufficient that hair bundles having at least three height differences are planted on the flocked surface 3a, and height differences of four or more steps may be provided.

The shapes of the hair follicles holes 5 and 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. Further, the number of holes 5 and 6 in the head portion 3 as a whole is not particularly limited, and is, for example, 40 to 60 holes. However, in the present embodiment, the maximum number of holes forming one row in the width direction (X direction) of the head portion 3 is five. That is, most of the hair bundle rows forming the brush 4 in the longitudinal direction (Y direction) of the head portion 3 are rows having five holes in the width direction (X direction) of the head portion 3.

Most of the plurality of hair bundle rows forming the brush 4 in the longitudinal direction (Y direction) of the head portion 3 form one row in the width direction (X direction) of the head portion 3, and the maximum number of holes is 6 or more. Is more preferable. When there are many rows in the head portion 3 having a maximum number of holes of 4 or less forming one row in the width direction (X direction) of the head portion 3, the roles of the outer hair bundle A and the inner hair bundle B are ineffective. It becomes clear.

The diameters of the hair follicle 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 hair follicle holes 5 and 6 is not limited to the arrangement pattern described above. Any arrangement pattern may be used as long as the brush 4 having a concave shape in the head portion 3 can be formed.
As shown in FIGS. 2 and 4A, in the configuration of the present embodiment, the half hair bundle portion a2 of the outer hair bundle A having the same hair length and the inner hair bundle B on the −X side in the head width direction Although the arrangement pattern is such that the half-hair bundle portion b1 of the outer hair bundle A and the other half-hair bundle portion a1 of the outer hair bundle A have a hair length longer than that of the one half-hair bundle portion b1 of the inner hair bundle B. It is not limited to this as long as it is guaranteed to be long.

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

Of the half-hair bundle portion a1 and the half-hair bundle portion a2 of the outer hair bundle A and the half-hair bundle portion b1 and the half-hair bundle portion b2 of the inner hair bundle B, which of the half-hair bundle portions a1, a2, b1, Whether or not the b2s face each other can be appropriately selected.

In the four arrangement patterns described above, since the half-hair bundle portion a1 of the outer hair bundle A is longer than the hair length of the half-hair bundle portion b1 of the inner hair bundle B, when viewed macroscopically, it is in the head width direction of the toothbrush. The central part is recessed, and the entire brush wraps the teeth during brushing, ensuring that the tips of the hair easily reach the gaps. Therefore, there is no clear difference in usability and function between the faction patterns.

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

The hair diameter of each hair bundle is not particularly limited, but since the outer hair bundle A needs to have high penetration into the gap, 4 mil to 8 mil that can secure flexibility is desirable. Further, since the inner hair bundle B needs to clean the tooth surface and support the teeth, 6 mil to 10 mil that can secure more rigidity is desirable.

Further, the step within the same hair bundle is preferably 0.5 mm to 3 mm, more preferably 1 mm to 2 mm. If there are too few steps, the cushioning property will be reduced, and it will be difficult to obtain a gentle touch to the gums. If the step is too large, it is difficult to secure the rigidity of the hair tips that enter the gap, and the cleanability deteriorates.

The difference in hair length 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 difference in hair length is too small, the formation of recesses from the outer circumference to the center of the head portion 3 becomes shallow, and it is not possible to wrap the teeth and allow the tips of the outer hair bundle A to reach the gap. On the other hand, if the difference in hair length between the half-hair bundle portion a1 and the half-hair bundle portion b1 is too large, the formation of the recess becomes too deep, and the fit of the hair tips along the tooth shape is lowered.

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

FIG. 5A is a diagram schematically showing the configuration of the head portion 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 has a half-hair bundle portion a1 and a half-hair bundle portion a2 forming the outer hair bundle A, and a half forming the inner hair bundle B. The hair bundles b1 and the half-hair bundles b2 have different hair lengths. In the present embodiment, the hair lengths t (a1), t (a2), t (b1), and t (b2) of the half hair bundles a1, a2, b1, and 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 portion a1 constituting the outer hair bundle A is 11.5 mm, and the hair length t (a2) of the half-hair bundle portion a2 is It is said to be 10.5 mm. On the other hand, the hair length t (b1) of the half-hair bundle portion b1 constituting the inner hair bundle B of the present embodiment is 9.5 mm, and the hair length t (b2) of the half-hair bundle portion b2 is 8.5 mm.

As described above, the hair length differences M1, M2, and M3 between the half-hair bundle portions a1, a2, b1, and b2 are all equal, and here, the hair length difference is 1 mm.

By making the hair lengths of all the half hair bundles a1, a2, b1 and b2 constituting the outer hair bundle A and the inner hair bundle B different, the cushion against the pressure load is compared with the toothbrush 20 of the first embodiment. A toothbrush 10 with increased properties and a gentler feel is obtained.

Further, the step of the brush 4 formed by offset flocking that provides a step in one hair bundle improves the cushioning property as the number of steps increases. Therefore, even if the bristles of the bristles constituting each bristles do not match the shape of the cleaning portion, the bristles of the brush 4 can move freely and have cushioning properties to be flexible during brushing. It is possible to fit the ends of the hair.

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

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

As shown in FIGS. 6A and 6B, the inner hair bundle B has a shorter hair length than the outer hair bundle A, but the half hair bundle portion b1 of the inner hair bundle B is the outer hair bundle A. 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), and t (b2) of each half-hair bundle portion 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 portion a1 constituting the outer hair bundle A is 11.5 mm, and the hair length t (a2) of the half-hair bundle portion a2 is 9.5 mm. On the other hand, the hair length t (b1) of the half-hair bundle portion b1 constituting the inner hair bundle B of the present embodiment is 10.5 mm, and the hair length t (b2) of the half-hair bundle portion 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 It is said to be 2 mm. It is the same as the second embodiment in that the hair lengths of all the half-hair bundles a1, a2, b1, and b2 are different, but the height difference in one hair bundle is as long as 2 mm.

As a result, the amount of protrusion between the half-hair bundles a1 and a2 in the outer hair bundle A and the half-hair bundles b1 and b2 in the inner hair bundle B is large, so that the bristles can move freely in the entire brush 4. Cushioning is increased, and cleanability into gaps and gentle contact are improved.

[Fourth Embodiment]
Next, the toothbrush of the fourth embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment shown below is substantially the same as that of the first embodiment, and the height difference of the brush is three stages, but the difference is that the hair lengths of the outer hair bundles are all the same. Therefore, in the following description, the different points will be described in detail, and the description of common points will be omitted. Further, in each of the drawings used for the explanation, the same components as those in FIGS. 1 to 4 are designated by the same reference numerals.

FIG. 7A is a diagram schematically showing the configuration of the head portion in the fourth embodiment. FIG. 7B is an enlarged view of a region surrounded by a broken line in FIG. 7A, showing a hair bundle located on one side (−X side) in the width direction of the head portion.
As shown in FIGS. 7A and 7B, in the toothbrush 40 of the present embodiment, the hair lengths of all the hairs constituting the outer hair bundle A are equal, and the hair lengths of the half hair bundles a1 and a2 are equal. It is said to be the same. That is, the hair bundles are planted by folding them evenly. Specifically, the hair lengths t (a1), t (a2), t (b1), and t (b2) of each half-hair bundle portion a1, a2, b1, b2 are t (a1) = t (a2). The relationship satisfies> t (b1)> t (b2).

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

As described above, in the toothbrush 40, the outer hair bundle A of the head portion 3 is composed of straight hairs, but the half hair bundles a1 and a2 of the outer hair bundle A are each half hair bundle of the inner hair bundle B. Since it is longer than the portions b1 and b2, when viewed macroscopically, the central portion is recessed in the head width direction. For this reason, the feature that the entire brush 4 wraps the teeth during brushing and the tips of the bristles easily reach the gap is ensured.

[Fifth Embodiment]
Next, the toothbrush of the fifth embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment shown below differs from that of the first embodiment in that the height difference of the brush is three stages, but the hair lengths of the inner hair bundles are all the same. Therefore, in the following description, the different points will be described in detail, and the description of common points will be omitted. Further, in each of the drawings used for the explanation, the same components as those in FIGS. 1 to 4 are designated by the same reference numerals.

FIG. 8A is a diagram schematically showing the configuration of the head portion according to the fifth embodiment. FIG. 8B is an enlarged view of a region surrounded by a broken line in FIG. 8A, showing a 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, the hair lengths of all the hairs constituting the inner hair bundle B are equal, and the hair lengths of the half hair bundles b1 and b2 are the same. It is said to be the same. That is, the hair bundles are planted by folding them evenly. Specifically, the hair lengths t (a1), t (a2), t (b1), and t (b2) of each half-hair bundle portion 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 portion a1 constituting the outer hair bundle A is 11.5 mm, and the hair length t (a2) of the half-hair bundle portion a2 is 10.5 mm. The hair length t (b1) of the half-hair bundle portion b1 and the hair length t (b2) of the half-hair bundle portion b2 constituting the inner hair bundle B are both 9.5 mm.

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

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

FIG. 9 is a plan view showing the configuration of the toothbrush head portion 3 of the sixth embodiment. 10 (a) is a cross-sectional view taken along the line BB'of FIG. 9, which schematically shows the configuration of the head portion in the sixth embodiment, and FIG. 10 (b) is FIG. 10 (a). ) Is an enlarged view of the area surrounded by the broken line, and shows the hair bundle located on one side (+ Y side) in the width direction of the head portion. Note 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 outer hair bundle and each half hair bundle portion in the inner hair bundle (hair length difference). ) Is illustrated in an easy-to-understand manner.
11 (a) is a cross-sectional view taken along the line AA'of FIG. 9, and FIG. 11 (b) is an enlarged view of a region surrounded by a broken line in FIG. 11 (a), and the width of the head portion. The hair bundle located on one side (-X side) of the direction is shown.

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

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

The central hair bundle group 13 is composed of a plurality of central hair bundles C having the same configuration as the outer hair bundle A, and as shown in FIGS. 10A and 10B, the half hair bundle portions c1 and c2 The hair lengths t (c1) and t (c2) satisfy 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 hair bundle group 13 connects the two outer hair bundles A located on both outer edge sides in the head width direction and forms a row between them, whereby the inner hair bundle groups 12 and 12 are formed. It is the same as being surrounded by the outer hair bundle group 11. As a result, two concave recesses are formed in the longitudinal direction of the head portion 3. Therefore, at the time of brushing, each recessed portion wraps around one tooth to fit.

According to the toothbrush 60 of the present embodiment, the central bristles group 13 increases the number of bristles responsible for intertooth cleaning, and the recessed area of the outer bristles group 11 shrinks to about one tooth, resulting in a larger gap. The fit of the hair tips to the teeth will be increased.

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

The configuration including the central hair bundle C of this embodiment can be appropriately applied to other embodiments as well.

[7th Embodiment]
Next, the toothbrush of the seventh embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment shown below is substantially the same as that of the first embodiment, and the hairs forming the outer hair bundle are ST hairs, but the hairs forming the inner hair bundle are straight hairs. Different in that. Therefore, in the following description, the different points will be described in detail, and the description of common points will be omitted. Further, in each drawing used for explanation, the same reference numerals are given to the components common to those in FIGS. 1 to 3.

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

According to the toothbrush 70 of the present embodiment, since the half-hair bundle portions b1 and b2 of the inner hair bundle B are both composed of straight hairs, the contact area of the hair tips with respect to the tooth surface increases, and the teeth Surface cleanability is improved.

[8th Embodiment]
Next, the toothbrush of the eighth embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment shown below is substantially the same as that of the first embodiment, but the outer hair bundle is composed of straight hair and a mixed hair of ST hair, and the inner hair bundle is composed of straight hair. It differs in that it is. Therefore, in the following description, the different points will be described in detail, and the description of common points will be omitted. Further, in each drawing used for explanation, the same reference numerals are given to the components common to those in FIGS. 1 to 3.

FIG. 13A is a diagram schematically showing the configuration of the head portion in the eighth embodiment. 13 (b) is an enlarged view of the area surrounded by the broken line in FIG. 13 (a), 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-hair bundle portion a1 of the outer hair bundle A having the longest hair length among the hair bundles constituting the brush 4 is ST. The hair is regarded as hair, and the other half-hair bundles a2, b1 and b2 are straight hair. That is, both the half-hair bundle portion b1 and the half-hair bundle portion b2 of the inner hair bundle B are composed of straight hair. The outer hair bundle A is planted by folding one end ST hair whose only one side is sharpened in two and sandwiching the flat line 7.

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

[9th Embodiment]
Next, the toothbrush of the ninth embodiment of the present invention will be described.
The basic configuration of the toothbrush of the present embodiment shown below is substantially the same as that of the first embodiment, except that all the bristles constituting the brush are composed of straight bristles. Therefore, in the following description, the different points will be described in detail, and the description of common points will be omitted. Further, in each drawing used for explanation, the same reference numerals are given to the components common to those in FIGS. 1 to 3.

FIG. 14A is a diagram schematically showing the configuration of the head portion in the ninth embodiment. 14 (b) is an enlarged view of the area surrounded by the broken line in FIG. 14 (a), 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 the present embodiment, all the hair bundles constituting the brush 4 are straight hairs. That is, all of the half hair bundles a1 and a2 of the outer hair bundle A and the half hair bundles b1 and b2 of the inner hair bundle B are composed of straight hair.

According to the toothbrush 90 of the present embodiment, since all the half hair bundles a1, a2, b1 and b2 in the outer hair bundle A and the inner hair bundle B are composed of straight hairs, the contact area with respect to the tooth surface is increased. Therefore, the cleaning efficiency of the tooth surface is further improved. Further, since the toothbrush 90 has a shape in which the central portion is recessed when viewed macroscopically, the feature that the entire brush wraps the teeth during brushing and the tips of the bristles easily reach the gap is ensured.

As described above, according to the wide-head specification toothbrush in each embodiment, since it is possible to polish a plurality of cleaning parts with many hair bundles, the cleaning efficiency is excellent and a gentle touch to the gums is obtained. Can be done.

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

(Preparation 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-mentioned first to ninth embodiments were produced. Here, two to four types of toothbrushes D1 (1) to D9 (4) having different arrangement patterns of hair bundles were prepared in each example.
Further, the 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 type or a plurality of types of toothbrushes E1 (1) to E4 (4) were prepared.

As shown in Table 2, in the toothbrush E1 of Comparative Example 1, the outer bristles A and the inner bristles B are both 11.5 mm and have the same hair length.
In the toothbrush E2 of Comparative Example 2, the inner hair bundle B has a shorter hair length than the outer hair bundle A, and both the hair bundles A and B are composed of hairs having the same hair length in the same hair bundle. ing. Specifically, the half-hair bundles a1 and a2 of the outer hair bundle A are 11.5 mm, respectively, and the half-hair bundles b1 and b2 of the inner hair bundle B are 10.5 mm, respectively.
In the toothbrush E3 of Comparative Example 3, the outer bristles A and the inner bristles B have the same configuration, one half bristles a1 and b1 are 11.5 mm, and the other half bristles 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 4 rows of hair bundles in the head width direction and 9 rows of hair bundles in the head length direction.

Here, the cleanability of the interdental and cervical regions and the gentle touching comfort to the gums of the toothbrushes D1 to D9 of Examples 1 to 9 and the toothbrushes D1 to D4 of Comparative Examples 1 to 4 were evaluated.

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

The average score of 10 monitors is 6.0 or more ◎ + 5.5 or more ◎, average score 5.0 or more is ○ +, average score 4.5 or more is ○, average score 4.0 or more is ○- An average score of 3.5 or more was designated as Δ, an average score of 3.0 or higher was designated as Δ, and an average score of less than 3.0 was designated as ×. The evaluation criteria are as follows.

The "feeling of removing dirt between the teeth and the cervical region" when compared with Comparative Example 1 is evaluated.
7 points: feel very strong, 6 points: feel strong, 5 points: feel, 4 points: equivalent, 3 points: do not feel much, 2 points: do not feel, 1 point: do not feel at all (same for other evaluations) )

The results are shown in Tables 1 and 2.

As shown in Table 1, under the conditions shown in Example 1, the cleanability between the teeth and the cervical region and the gentle touch to the gums were evaluated better than those of the comparative example. In all of 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 the inner hair bundle B. Since it is longer than the hair lengths of the hair bundles b1 and b2, the central portion is recessed in the head width direction. Therefore, the feature that the entire brush wraps the teeth during brushing and the tips of the bristles easily reach the gap is ensured. Therefore, there is no clear difference in usability and functionality between the derived patterns.

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

Under the conditions shown in Example 3, particularly good results were obtained with respect to the cleanability between the teeth and the cervical region. In addition, good results were 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 hair length is different among all the half-hair bundles a1, a2, b1, and b2, but the half-hair bundle b1 is more than the half-hair bundle a2. The difference is that the hair length is long, and the step within the same hair bundle is as long as 2 mm. In particular, the latter gives a difference in terms of use and function, and since the amount of protrusion of the half-hair bundle is large, the degree of freedom and cushioning of the hair tips are increased, and the cleanability to the gap and the gentle touch are improved. improves.

Under the conditions shown in Examples 4 and 5, better results were obtained than in Comparative Examples in terms of cleanability between the teeth and the cervical region and gentle contact with the gums.
In the toothbrushes D4 and D5, either the outer bristles A or the inner bristles B are planted by "equal folding", and there is no step in each bristles.
When viewed macroscopically, 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 in the entire brush, so that in the head width direction. The central part has a concave shape. For this reason, the feature that the entire brush wraps the teeth during brushing and the bristles of the brush easily reach the gap is secured.

Under the conditions shown in Example 6, the cleanability between the teeth and the cervical region was particularly good, and good results were also obtained with respect to the gentle touch to the gums.
The toothbrush D6 has a central bristles C in addition to the outer bristles A and the inner bristles B. The central hair bundle C increases the number of hair bundles responsible for cleaning between teeth. Further, the recessed region of the inner hair bundle B, which is divided into two in the head length direction, is reduced to about one tooth, so that the fit of the hair tips to the gap is further improved.

Under the conditions shown in Example 7, the cleanability between the teeth and the cervical region is good, but the feeling of contact with the gums is slightly reduced. This is because the inner bristles B of the toothbrush D7 are composed of straight bristles at both ends, but a step is provided in the brush due to offset flocking, and the bristles are a portion responsible for cleaning the tooth surface. , The gentle touch to the gums is secured from the comparative example.

Even under the conditions shown in Example 8, the cleanability between the teeth and the cervical region is good, but the feeling of contact with the gums is slightly reduced. In the toothbrush D8, only the half hair bundle portion a1 of the outer hair bundle A is ST hair, and both the other half hair bundle portion a2 and the half hair bundle portions b1 and b2 of the inner hair bundle B are straight hairs. .. Therefore, the accessibility to the gap and the gentle touch to the gums are inferior to those of the toothbrushes of the other examples in which all the bristles are composed of ST bristles. However, since the tips of the half-hair bundles a1 of the outer hair bundle A having the longest hair length are sharpened, the accessibility to the gap is higher than that of Comparative Examples 1 to 4.

In the conditions shown in Example 9, all the half hair bundles a1, a2, b1 and b2 in the outer hair bundle A and the inner hair bundle B are composed of straight hairs based on the conditions of Example 1. The cleanability of the gap is reduced. However, since the toothbrush D9 has a shape in which the central portion is recessed when viewed macroscopically, the feature that the tooth is wrapped with the entire brush during brushing and the bristles easily reach the gap is secured.

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 cleanability between the teeth and the cervical region and the gentle contact feeling with the gums are evaluated to be inferior to those of the examples. It was.

Under the conditions shown in Comparative Example 2, although the outer hair bundle A and the inner hair bundle B have different hair lengths, they are planted in equal folds, so that the entire brush is formed in two stages. Therefore, although the gap cleaning property and the feeling of contact with the gums are improved as compared with Comparative Example 1, the results are inferior to those of each of the above Examples.

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

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

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

The hole arrangement (lattice / houndstooth) of the outer hair bundle A and the inner hair bundle B is also not particularly limited.
Further, the outer hair bundle A is not limited to one row, and if there is a margin in the head width, a plurality of rows (for example, two rows) may be configured after adjusting the hair bundle diameter.

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

The cross-sectional shape of the hair is also not limited to a circular shape.

2 ... Handle body, 3 ... Head part, 3a ... Flocked surface, 4 ... Brush, 5, 6 ... Flocked 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, M1, M2 ... Hair length difference

Claims (5)

A head portion in which a plurality of bristle tufts are implanted to the bristle surface, has a handle body extending from said head portion,
The number of the hair bundles in the width direction intersecting the extending direction of the handle body is a maximum of 5 or more, and the number of the hair bundles in the length direction of the head is a maximum of 7 or more.
The head portion has a plurality of inner hair bundles and a plurality of outer hair bundles provided so as to surround the plurality of inner hair bundles.
The outer hair bundle and the inner hair bundle each have two half-hair bundles having different hair lengths.
The half-hair bundle portion has the same hair length in one half-hair bundle portion.
The hair lengths of the half-hair bundles b1 and b2 of the inner hair bundle are t (b1), t (b2),
When the hair lengths of the half hair bundles a1 and a2 of the outer hair bundle are t (a1) and t (a2), the hair length of the half hair bundle is any of the following, and the outer hair bundle And the steps between all the half-hair bundles constituting the inner hair bundle are 3 or 4 steps.
T (a1)> t (a2) = t (b1)> t (b2)
T (a1)> t (a2)> t (b1)> t (b2)
T (a1)> t (b1)> t (a2)> t (b2)
A toothbrush that features that. It has a plurality of central hair bundles that separate the plurality of inner hair bundles into two in the longitudinal direction of the head portion, and the hair length of the central hair bundle is equal to the hair length of the outer hair bundle.
The toothbrush according to claim 1. At least one of the outer bristles and the inner bristles comprises a plurality of hairs with sharpened tips.
The toothbrush according to claim 1 or 2. The number of flocked holes formed on the flocked surface is 40 or more and 60 or less.
The toothbrush according to any one of claims 1 to 3 . The toothbrush according to claim 4 , wherein the flocked area surrounded by connecting the edges of the plurality of flocked holes located on the outermost side of the head portion is 2.0 cm ² or more and 2.8 cm ² or less. ..

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