WO2022137971A1

WO2022137971A1 - Toothbrush

Info

Publication number: WO2022137971A1
Application number: PCT/JP2021/043227
Authority: WO
Inventors: 雄也木本; 良輔高井; 晃大石川; 佳薇李
Original assignee: ライオン株式会社
Priority date: 2020-12-24
Filing date: 2021-11-25
Publication date: 2022-06-30
Also published as: KR20230120631A; JP2022100465A; CN216932263U; TW202228550A; CN116634904A

Abstract

The purpose of the present invention is to provide a wide head type toothbrush in which the neck part is prevented from bending in the width direction thereof and from being twisted in the circumferential direction about the long-axis direction thereof. The maximum length of the head part in the width direction is 12-18 mm. The maximum length of the head part in the thickness direction is 2-4 mm. The minimum length of the neck part in the width direction and the minimum length of the neck part in the thickness direction are 3-5 mm. In the neck part, when let a region from a second position to a third position which is at a distance corresponding to 65% of the length of the neck part from the second position is defined as C, and when a region from the third position to a fourth position which is a boundary between the neck part and a grip part and which is at a distance corresponding to 35% of the length of the neck part from the third position is defined as D, the relation (volume of region D)/(volume of region C)≥1.0 is satisfied. At the fourth position, the maximum length in the width direction is greater than the maximum length in the thickness direction.

Description

toothbrush

The present invention relates to a toothbrush.
This application claims priority based on Japanese Patent Application No. 2020-214446 filed in Japan on December 24, 2020, the contents of which are incorporated herein by reference.

There are various types of toothbrush head 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, a "wide head type" toothbrush having a wide head portion, which can simultaneously polish the cervical portion, the interdental portion and the tooth surface, is provided (for example, Patent Document 1).

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

Japanese Unexamined Patent Publication No. 2016-13247

If a thin neck is used for the "wide head type" toothbrush in consideration of operability in the oral cavity, the center of gravity becomes unstable during brushing, so the neck may bend in the width direction or be centered in the long axis direction. The problem of twisting in the circumferential direction arises.

The present invention has been made in consideration of the above points, and is a "wide head type" toothbrush that can prevent the neck portion from bending in the width direction or twisting in the circumferential direction centered on the long axis direction. The purpose is to provide.

According to the first aspect of the present invention, a head portion located on the tip side in the long axis direction and having a flocked surface, a grip portion arranged on the rear end side of the head portion, the head portion and the grip portion. The maximum length of the head portion having a neck portion arranged between the hair-planted surface and the head portion in the width direction parallel to the hair-planted surface and orthogonal to the long-axis direction is 12 mm or more and 18 mm or less, and the hair-planted portion. The maximum length of the head portion in the thickness direction orthogonal to the surface is 2 mm or more and 4 mm or less, and the minimum length of the neck portion in the width direction and the minimum length in the thickness direction are 3 mm or more. In the head portion, the region from the tip end to the first position on the rearmost end side where the length in the width direction is maximum in the major axis direction is defined as A, and the head portion is from the first position. The region up to the second position of the boundary between the neck portion and the neck portion is defined as B, and the third position in the neck portion is 65% of the length of the neck portion in the major axis direction from the second position. The region up to is C, and the region from the third position to the fourth position of the boundary between the neck portion and the grip portion, which is 35% of the length of the neck portion in the major axis direction, is D. Then, the relationship of (volume of region D) / (volume of region C) ≧ 1.0 is satisfied, and at the fourth position, the maximum length in the width direction is larger than the maximum length in the thickness direction. Toothbrushes characterized by being large are provided.

Further, the toothbrush according to one aspect of the present invention is characterized by satisfying the relationship of (volume of the region A) / (volume of the region D) ≤ 0.60.

Further, in the toothbrush according to one aspect of the present invention, the volume of the region D is 1000 mm ³ or more.

Further, in the toothbrush according to one aspect of the present invention, (the sum of the volume of the region A and the volume of the region C) / (the volume of the region A, the volume of the region B, the volume of the region C, and the above). It is characterized in that the relationship of (total volume of region D) ≤ 0.70 is satisfied.

Further, in the toothbrush according to one aspect of the present invention, the maximum length in the width direction at the fourth position is 11 mm or more, and (the maximum length in the width direction at the fourth position)-(. It is characterized in that the relationship of (maximum length in the thickness direction) ≧ 2 mm at the fourth position is satisfied.

Further, in the toothbrush according to one aspect of the present invention, the relationship of 1.5 mm ≤ (maximum length of the region A in the width direction)-(maximum length of the fourth position in the width direction) ≤ 7 mm is satisfied. It is characterized by doing.

Further, in the toothbrush according to one aspect of the present invention, the relationship of (maximum length in the thickness direction at the fourth position)-(maximum length in the thickness direction at the third position) ≥ 3 mm is satisfied. It is characterized by doing.

Further, in the toothbrush according to one aspect of the present invention, (maximum length in the thickness direction at the third position)-(mean value of the length of the region A over the long axis direction in the thickness direction) ≤ 2 mm. It is characterized by satisfying the relationship of. The average value of the length of the region A in the major axis direction in the thickness direction is (the maximum value of the length of the region A in the major axis direction in the thickness direction + the thickness direction of the region A in the major axis direction). It is defined by the value represented by (minimum value of length) / 2.

Further, in the toothbrush according to one aspect of the present invention, the region C has a maximum length of 4.5 mm or less in the thickness direction over the long axis direction (in the width direction at the third position). It is characterized in that the relationship of (maximum length)-(maximum length in the thickness direction at the third position)> 1 mm is satisfied.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a wide-head type toothbrush that can prevent the neck portion from bending in the width direction or twisting in the circumferential direction centered on the long axis direction.

It is a figure which shows the embodiment of this invention, and is the front view which looked at the toothbrush 1 from the flocking surface 3a side. It is a side view which shows the structure of a toothbrush 1. It is a partially enlarged front view of a part of a head part 3 and a neck part 4. It is a partially enlarged front view of a part of a head part 3 and a neck part 4.

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 4.
It should be noted that the following embodiments show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.

Further, in the following description, the side of the head portion 3 where the flocked surface 3a is provided (the side facing the flocked surface) is the front side of the toothbrush 1, which is opposite to the side of the head portion 3 facing the flocked surface 3a. The side is the back side of the toothbrush 1. In addition, the direction in which the handle body 2 extends is the major axis direction, the direction parallel to the hair-planted surface 3a and orthogonal to the major axis direction is the width direction of the toothbrush 1, and the direction orthogonal to the hair-planted surface 3a is the thickness of the toothbrush 1. It will be explained as an orthogonal direction. Further, the side where the head portion 3 is provided (head portion 3 side) in the long axis direction is referred to as the front end side, and the side where the grip portion 5 is provided (the grip portion 5 side) is appropriately described as the rear end side.

FIG. 1 is a front view of the toothbrush 1 as viewed from the flocked surface 3a side.
FIG. 2 is a side view showing the configuration of the toothbrush 1. In FIG. 1, the brush 40 is not shown.

As shown in FIGS. 1 and 2, the toothbrush 1 of the present embodiment includes a handle body 2 and a brush 40 made of a resin molded body formed in an elongated shape as a whole. As an example, the total length of the toothbrush 1 is 150 mm or more and 200 mm or less.

The handle body 2 is made of hard resin. The handle body 2 is arranged between the head portion 3 located on the tip side and having the flocked surface 3a, the grip portion 5 arranged on the rear end side of the head portion 3, and the head portion 3 and the grip portion 5. It has a neck portion 4. The toothbrush 1 can be cleaned in the oral cavity by a brush 40 having a plurality of hair bundles (not shown) planted on the flocked surface 3a of the head portion 3.

Examples of the hard resin forming the handle body 2 include resins having a flexural modulus (JIS7171) of 1000 MPa or more and 2800 MPa or less, and examples thereof include polypropylene (PP) resin, polyacetal (POM) resin, and polybutylene terephthalate. It is preferable to use (PBT) resin or the like in consideration of strength.

(Outer contour line shape on both sides of the handle body in the width direction)
As shown in FIG. 1, when the handle body 2 is viewed from the front, the toothbrush 1 of the present embodiment is located at the center in the width direction and extends on both sides in the width direction with respect to the center line extending in the long axis direction. The outer contour line is formed line-symmetrically. Therefore, in the following description, the outer contour line on one side (lower side in FIG. 1) in the width direction will be described, and the description of the outer contour line on the other side (upper side in FIG. 1) will be omitted. Further, regarding the position of the center of curvature of the curved line extending in an arc shape, the case on the center side in the width direction with respect to the outer contour line is referred to as the inside, and the case on the opposite side to the center in the width direction is referred to as the outside.

In the toothbrush 1 of the present embodiment, when the handle body 2 is viewed from the front, the length of the head portion 3 in the width direction is increased from the tip end side of the head portion 3 to the rear end side in the outer contour line in the width direction of the handle body 2. A first curved region E1 extending in an arc shape, a first straight line region L1 extending from the rear end of the first curved region E1 in the width direction to the first position P1 with a constant width in the width direction, and a first straight line region L1. The second straight line region L2 in which the length in the width direction of the head portion 3 becomes smaller from the first position P1 to the second position P2 which is the boundary between the head portion 3 and the neck portion 4, and the width of the neck portion 4 from the second position P2. A third straight line region L3 having a constant length in the direction and extending toward the rear end side, and a second curved line region E2 having a center of curvature on the outside and extending in an arc shape from the rear end to the rear end side of the third straight line region L3. The length of the grip portion 5 from the rear end of the third curved region E3, which has a center of curvature on the inside and extends in an arc shape from the rear end of the second curved region E2 to the rear end side, is It has a fourth straight line region L4 that is constant and extends toward the rear end side.

(Outer contour line shape on the front side of the handle body)
As shown in FIG. 2, when the handle body 2 is viewed from the side, the toothbrush 1 of the present embodiment has an outer contour line on the front side of the handle body 2 from the rear end side of the head portion 3 to the grip portion 5 side. A convex shape is formed from the rear end of the fifth straight line region L5 having a center of curvature on the front side and the fifth straight line region L5 continuously extending linearly toward the rear end side from the flocked surface 3a of the head portion 3. The fourth curved region E4, which is provided with the apex 51 and extends in an arc shape on the rear end side to the fourth position P4 which is the boundary between the neck portion 4 and the grip portion 5, and the fourth position P4 having the center of curvature on the front side. It has a fifth curve region E5 extending in an arc shape from the apex 51 to the rear end side, and a sixth straight line region L6 extending linearly from the rear end to the rear end side of the fifth curve region E5.

(Outer contour line shape on the back side of the handle body)
The toothbrush 1 of the present embodiment has a seventh straight line region L7 extending linearly from the tip end side of the head portion 3 to the rear end side in the outer contour line on the back surface side of the handle body 2 when the handle body 2 is viewed from the side. A sixth curved region E6 having a center of curvature on the front side and extending in an arc shape from the rear end of the seventh straight line region L7 to the rear end side, and a linearly extending linearly from the rear end to the rear end side of the sixth curved region E6. It has an eighth straight line region L8.
The straight line and the curved line of the outer contour line shape in the toothbrush 1 described above are one aspect. It may be present, and the outer contour line shape is not limited to the above description.

(Head part)
The head portion 3 is a portion that sweeps the oral cavity with a plurality of hair bundles, and as shown in FIG. 1, has a substantially rectangular shape having an arc shape when viewed from the front, and has a rounded corner portion. Have. In the present embodiment, the boundary between the head portion 3 and the neck portion 4 is the end point of the curve forming the corner cut on the neck portion 4 side in the front view shape of the head portion 3, that is, the bending of the curve forming the corner cut. It is the second position P2 whose direction changes.

The head portion 3 has a flocked surface 3a on the front side. A plurality of flocked holes 6 are arranged side by side on the flocked surface 3a. The shape and diameter of the hair follicles 6 are not particularly limited, and FIG. 1 shows, as an example, a hair follicles 6 having a circular front view and the same diameter. The hair follicles 6 have a plurality of rows (3 to 7 in FIG. 2) arranged at intervals in the width direction according to the length of the head portion 3 in the width direction. Rows (10 rows in FIG. 2) are provided. Hair follicles constituting the brush 40 are transplanted to each of the hair transplant holes 6.

The hair follicles are formed by bundling a plurality of brushes (filaments), folding them in half, sandwiching a metal retaining tool (not shown) called a flat wire between them, and driving the hair follicles into the hair follicles 6. It is planted in. The shape of the head portion 3 is not particularly limited, and for example, the flocked surface 3a on the front side and the surface on the back side form flat and parallel surfaces.

The maximum length of the head portion 3 in the width direction is preferably, for example, 12 mm or more and 18 mm or less. The head portion 3 of the present embodiment is a so-called wide head type. By having the wide head type head portion 3, it is possible to increase the contact area of each part of the teeth and to brush a plurality of teeth, so that the teeth can be brushed efficiently.

The maximum length of the head portion 3 in the thickness direction is, for example, preferably 2 mm or more and 4 mm or less, and more preferably 2.5 mm or more and 3.5 mm or less. The head portion 3 of the present embodiment is a so-called thin head. By having the thin head portion 3, it is possible to improve the operability of the back teeth and improve the cleaning power of the back teeth even in the wide head type head portion 3.

In the present embodiment, in the head portion 3, the region from the first position P1 to the first position P1 on the rearmost end side where the length from the tip to the width direction is maximum in the long axis direction is defined as A, and the head portion 3 Let B be the region up to the second position P2 at the boundary between the neck portion 4 and the neck portion 4.

The outer contour of the head portion 3 in the front view is an ellipse or the like, and the position on the rearmost end side where the length in the width direction is maximum is not on the rear end side of the center in the long axis direction of the head portion 3. In this case, the row having the largest number of hair follicles 6 arranged in the width direction can be located in the long axis direction of the rear end side edge portion of the hair follicles 6 in the row on the rearmost end side.

In the head portion 3, the ratio of the total volume of the flocked holes 6 (total hole volume) to the resin volume of the flocked region connecting the outer edges of the flocked holes 6 located on the outermost side is 1: 2.5. The above is preferable.
By setting the ratio of the total volume of the flocked holes 6 to the resin volume of the flocked region to 1: 2.5 or more,
Since the amount of resin in the flocked region is large with respect to the flocked hole 6 and the head portion 3 becomes rigid, it is possible to suppress the occurrence of warpage and bending of the head portion 3 even though it is a wide head type and a thin head type. Can be done.

The maximum length of the head portion 3 in the long axis direction is preferably 25 mm or more. By setting the maximum length of the head portion 3 in the long axis direction to 25 mm or more, the thin region becomes long and it becomes easy to polish the back teeth. Further, it is possible to prevent the neck portion 4 from becoming excessively long, and to polish the neck portion 4 without excessive bending.

(Neck)
The neck portion 4 is a portion arranged between the grip portion 5 and the head portion 3 and connecting the grip portion 5 and the head portion 3. The boundary between the neck portion 4 and the grip portion 5 is the fourth position P4 where the fourth curve region E4 and the fifth curve region E5 intersect in the side view. That is, it is a position where the apex 51 of the convex shape is formed by connecting to the fourth curve region E4 and the fifth curve region E5 having the center of curvature on the outside.
The boundary between the neck portion 4 and the grip portion 5 when there is no convex apex or cannot be visually recognized is a position where the center of curvature switches in the thickness direction in the side view, and when this position cannot be specified, for example, for example. The position is set to switch from a hard resin to a different resin such as a soft resin such as an elastomer, and if this position cannot be specified, the position is set to 75 mm from the tip end side of the head portion 3 to the rear end side.

In the neck portion 4, the region where the outer contour line is formed in the third straight line region L3 in the front view shown in FIG. 1 is constant and maximum from the second position P2 which is the boundary with the head portion 3 toward the grip portion 5. It will be small. The neck portion 4 has a width from the minimum width in a region from the rear end of the third straight line region L3 to the fourth position P4 which is the rear end of the third curved region region E3 in which the outer contour line is connected via the second curved region region E2. It gradually becomes wider.

The minimum length of the neck portion 4 in the width direction is preferably 3 mm or more and 5 mm or less, and more preferably 3.5 mm or more and 4.5 mm or less. The minimum length of the neck portion 4 in the thickness direction is preferably 3 mm or more and 5 mm or less. The neck portion 4 of the present embodiment is a so-called slim neck type. By setting the minimum length in the width direction and the minimum length in the thickness direction of the neck portion 4 to 3 mm or more and 5 mm or less, the operability of the back teeth is improved even in the wide head type head part 3, and the back teeth are cleaned. You can improve your power.

The length from the first position P1 on the rearmost end side where the length in the width direction of the head portion 3 is maximum to the second position P2 on the most advanced side where the length in the width direction of the neck portion 4 is minimum is , 9.0 mm or less is preferable.
By setting the length from the first position P1 to the second position P2 to 9.0 mm or less, the width of the rear end side of the head portion 3 converges sharply until the neck portion 4 becomes the finest. The length of the can be reduced and the operability can be improved.

(Grip part)
The grip portion 5 is a portion gripped by the user and is formed in a long columnar shape.
In the side view shown in FIG. 1, the grip portion 5 has a constant length in the width direction from the fourth position P4 at the boundary with the neck portion 4 toward the rear end side.

In the side view shown in FIG. 2, the grip portion 5 has a fifth curved region E5 on the outer contour line on the front side at the fourth position P4 from the fourth position P4 of the boundary with the neck portion 4 toward the rear end side. The thickness gradually decreases to the rear end side end portion of the fifth curve region E5 where the maximum value is reached and the grip portion 5 is the minimum thickness. The length of the grip portion 5 in the thickness direction is constant on the rear end side of the fifth curve region E5 with respect to the rear end side end portion.

The grip portion 5 has a finger rest portion 50 on the front side, for example, with which the thumb abuts. In the side view, the finger contact portion 50 is formed at the rear end side end portion of the fifth curved region E5, which is a concave curved surface toward the back end side from the apex 51 toward the rear end side. By providing the finger pad 50 with a concave curved surface, a fit can be obtained when the finger pad 50 is pressed toward the back surface side.

Since the finger pad portion 50 has a convex apex 51 and a flat shape, it is adjusted so as not to be excessively bent in the thickness direction, and the propagation of the bending from the neck portion 4 to the grip portion 5 is suppressed. Can be done.
Further, by providing the convex apex 51, a large wall thickness on the front side of the grip portion 5 can be secured, the grip portion 5 does not bend excessively in the thickness direction, and appropriate flexibility is transmitted to the grip portion 5 side. It is possible to suppress the propagation of the deflection from the neck portion 4 to the grip portion 5.

The length from the tip of the head portion 3 to the tip end portion (fourth position P4) of the finger rest portion 50 in the long axis direction is preferably 77 mm or more and 90 mm or less.
By setting the length in the long axis direction from the tip of the head portion 3 to the tip end of the finger rest 50 to 77 mm or more and 90 mm or less, the tip side is sufficiently longer than the tip end of the finger rest 50. It becomes easier to reach the back of the back teeth.

The length in the long axis direction from the finest part of the neck portion 4 (second position P2) to the tip end side end portion (fourth position P4) of the finger rest portion 50 is preferably 52 mm or more and 70 mm or less.
By setting the length in the long axis direction from the finest detail of the neck portion 4 to the tip end of the finger rest 50 to 52 mm or more and 70 mm or less, the neck portion 4 becomes sufficiently long and easily reaches the depths of the back teeth. Become.

From the neck portion 4 to the rear end of the grip portion 5, either the back side or the front side in the thickness direction is the distance in the thickness direction between the back surface of the head portion 3 and the back surface of the grip portion 5, or the head portion 3. The distance between the front surface (flocked surface 3a) and the front surface of the grip portion 5 in the thickness direction is 2.5 mm or less, and the cross-sectional shape orthogonal to the long axis direction is wide and flat, and the back side or the front surface in the thickness direction. It is preferable that the thickness of either side from the neck portion 4 to the finger rest portion 50 gradually increases.
As a result, the thickness from the neck portion 4 to the finger rest portion 50 increases in one direction, so that even a long neck portion 4 is less likely to bend and a firm polishing feeling can be obtained. Further, since the difference between the positions of the neck portion 4 and the grip portion 5 in the thickness direction is small, it becomes easy to polish the targeted position in the oral cavity. Further, the position of the rear end side end portion of the third straight line region L3 is preferably within ± 15 mm in the long axis direction from the third position P3 described later.

In the case of adopting this configuration, in the region from the position on the rearmost end side where the length of the neck portion 4 in the width direction is the minimum to the tip end side end portion of the finger pad portion 50, for example, abruptly at 5 to 10 mm. It is preferable that the thickness is increased. Further, it is preferable that the back surface of the head portion 3 and the back surface of the grip portion 5, or the front surface of the head portion 3 and the front surface of the grip portion 5 are parallel to each other. As a result, the force transmitted from the grip portion 5 to the head portion 3 is applied to the teeth by the same vector, and a firm polishing feeling can be obtained and the operability can be improved.

The grip portion 5 has a length in the thickness direction of 9.0 mm or more, a length in the width direction of 10 mm or more, a region having a constant thickness and width of 80 mm or more, and only a hard resin. It is preferable to have a region having a constant thickness and width of 90 mm or more and 120 mm or less.
If the area where the thickness and width of the grip portion 5 are constant is less than 80 mm, the grip portion 5 cannot be gripped by the entire palm and is not stable. When the region where the thickness and width of the grip portion 5 are constant exceeds 120 mm, the gripping portion is not determined, and the center of gravity is not stable when gripped on the rear end side. By forming the thickness and width of the grip portion 5 within the above range and using only the hard resin, it is difficult to bend and the grip portion 5 can be gripped firmly, and a firm polishing feeling can be obtained.

The length of the grip portion 5 from the tip of the finger rest portion 50 to the rear end of the grip portion 5 in the major axis direction is 80 mm or more and 120 mm or less, and the total length of the handle body 2 is 150 mm or more as described above. , 200 mm or less is preferable.
By setting the length of the grip portion 5 and the handle body 2 to the above range, it is possible to grip firmly, a firm polishing feeling can be obtained, and the total length is sufficiently secured, so that the grip is easy to grip and the oral cavity is in the oral cavity. Can be secured for easy reach.

(Area A to Area D)
As shown in FIG. 1, in the neck portion 4, the region from the second position P2 to the third position P3, which is 65% of the length of the neck portion 4 in the long axis direction, is defined as C, and the third position P3. Therefore, assuming that the region up to the fourth position P4 of the boundary between the neck portion 4 and the grip portion 5, which is 35% of the length of the neck portion 4 in the major axis direction, is D, (volume of region D) / It is preferable to satisfy the relationship of (volume of region C) ≧ 1.0, and more preferably satisfy the relationship of (volume of region D) / (volume of region C) ≧ 1.5.

(Volume of region D) / (Volume of region C) ≧ 1.0, that is, the volume of region D located on the rear end side of the neck portion 4 is equal to or greater than the volume of region C located on the front end side of the neck portion 4. By doing so, it is possible to strengthen the root of the neck portion 4 on the grip portion 5 side and suppress bending and twisting while ensuring the advantage of intraoral operability on the tip end side of the neck portion 4.

The volume of each area A to D was calculated by multiplying the area of each area A to D in the front view by the area in the side view / the length in the long axis direction.

The length in the width direction at the third position P3 of the rear end side end portion of the region C is preferably 6.7 mm or less.
By setting the length in the width direction at the third position P3 to 6.7 mm or less, a narrow region of the neck portion 4 continues from the second position P2 at the boundary with the head portion 3 to the third position P3, and the operation is performed. You can secure sex.

The value represented by (maximum length in the width direction of the region C) / (maximum length in the thickness direction of the region C) over the entire length of the region C is 1.0 or more and 1.8. The following is preferable.
The value represented by (maximum length in the width direction of the region C) / (maximum length in the thickness direction of the region C) is 1.0 or more and 1.8 over the entire length of the region C in the major axis direction. By doing the following, the neck portion 4 of the wide-head type toothbrush 1 is widened to prevent twisting.

The position where the length in the width direction is 1 mm larger than the second position P2 which is the start point of the region C is 40% of the length in the major axis direction of the neck portion 4 with respect to the start point of the region C. Is preferably present on the finger pad 50 side, and more preferably on the finger pad 50 side than at a position that is 50% of the length of the neck portion 4 in the long axis direction.
A region where the length in the width direction is small and narrow because the position where the length in the width direction is increased by 1 mm is located on the finger pad 50 side of the position where the length in the long axis direction of the neck portion 4 is 40%. Can be improved in operability because it exists for a long time.

At the fourth position P4, which is the rear end side end portion of the region D, the maximum length in the width direction is preferably larger than the maximum length in the thickness direction.
At the fourth position P4, the maximum length in the width direction is larger than the maximum length in the thickness direction, so that the shape can be flattened in the width direction.

The volume of the region D is preferably 1000 mm ³ or more, and more preferably 1300 mm ³ or more.
By setting the volume of the region D to 1000 mm ³ or more, the volume of the root of the neck portion 4 becomes sufficiently large, and bending and twisting can be suppressed.

The maximum length in the width direction at the fourth position P4, which is the rear end side end of the region D, is 11 mm or more, and (the maximum length in the width direction at the fourth position P4)-(at the fourth position P4). It is preferable to satisfy the relationship of maximum length in the thickness direction) ≧ 2 mm.
The maximum length in the width direction at the fourth position P4, which is the rear end side end of the region D, is set to 11 mm or more, and (the maximum length in the width direction at the fourth position P4)-(the thickness at the fourth position P4). By satisfying the relationship of (maximum length in the direction) ≧ 2 mm, since the root of the neck portion 4 is wide, it is possible to suppress bending and twisting of the neck portion 4 in the width direction.

Further, it is preferable to satisfy the relationship of 1.5 mm ≦ (maximum length in the width direction of the region A) − (maximum length in the width direction at the fourth position P4) ≦ 7 mm.
If (maximum length in the width direction of the region A)-(maximum length in the width direction at the fourth position P4) is less than 1.5 mm, it is not applied as the wide head type head portion 3 or the root of the neck portion 4. However, it becomes abnormally wide and impairs the usability. If (the maximum length in the width direction of the region A)-(the maximum length in the width direction at the fourth position P4) exceeds 7 mm, the twist suppressing effect is reduced.

Further, it is preferable to satisfy the relationship of (maximum length in the thickness direction at the fourth position P4)-(maximum length in the thickness direction at the third position P3) ≥ 3 mm.
By satisfying the relationship of (maximum length in the thickness direction at the fourth position P4)-(maximum length in the thickness direction at the third position P3) ≥ 3 mm, the thickness within the region D of the neck portion 4 is satisfied. You can make a big difference. Therefore, it is possible to suppress the propagation of the deflection in the thickness direction to the grip portion 5. Therefore, by rapidly increasing the thickness of the neck portion 4 in the short region D, it is possible to suppress twisting while ensuring the advantage of operability.

Regarding the region A in the head portion 3 and the region D in the neck portion 4, it is preferable that the relationship of (volume of region A) / (volume of region D) ≤ 0.60 is satisfied, and (volume of region A) /. It is more preferable to satisfy the relationship (volume of region D) ≤ 0.40. As for the volume of the region A, the volume of the hair follicle hole 6 (total hole volume) is excluded.
By setting (volume of region A) / (volume of region D) ≦ 0.60, the volume of the head portion 3 can be made smaller than the volume on the rear end side of the neck portion 4. Therefore, by setting (volume of region A) / (volume of region D) ≤ 0.60, the rear end side of the neck portion 4 is secured while ensuring the advantages of efficient printing and operability by the thin wide head. Can be strengthened to suppress bending and twisting.

For the regions A and B in the head portion 3 and the region C in the neck portion 4, 0.7 ≦ (volume of the region A) / [(volume of the region B) + (volume of the region C)] ≦ 1.0. It is preferable to satisfy the relationship. Regarding the volume of the region B, the volume of the hair follicle hole 6 (total hole volume) is excluded.
By satisfying the relationship of 0.7 ≤ (volume of region A) / [(volume of region B) + (volume of region C)] ≤ 1.0, the volume of region A becomes the volume of region B and the volume of region C. Since it is smaller than the total volume of, operability can be ensured.

It is preferable to satisfy the relationship of (maximum length in the thickness direction at the third position P3)-(mean value of the length in the thickness direction of the region A over the long axis direction) ≤ 2 mm. The average value of the length of the region A in the major axis direction in the thickness direction is (the maximum value of the length of the region A in the major axis direction in the thickness direction + the thickness direction of the region A in the major axis direction). It is defined by the value represented by (minimum value of length) / 2.
By satisfying the relationship of (maximum length in the thickness direction at the third position P3)-(average value of the length in the thickness direction of the region A over the long axis direction) ≤ 2 mm, the head portion 3 to the neck portion Since the thickness of 65% on the tip side (head portion 3 side) in No. 4 does not change significantly, operability can be improved.

The region C has a maximum length in the thickness direction of 4.5 mm or less over the major axis direction, and (maximum length in the width direction at the third position P3)-(maximum length in the thickness direction at the third position P3). It is preferable to satisfy the relationship of length)> 1 mm.
The region C has a maximum length in the thickness direction of 4.5 mm or less over the major axis direction, and (maximum length in the width direction at the third position P3)-(maximum length in the thickness direction at the third position P3). By satisfying the relationship of length)> 1 mm, the neck portion 4 is wide and the neck portion 4 bends in the width direction while ensuring the advantage of operability in the portion extending to the root of the neck portion 4. It is possible to suppress things and twists.

It is preferable to satisfy the relationship of (total of the volume of the region A and the volume of the region C) / (the total of the volume of the region A, the volume of the region B, the volume of the region C, and the volume of the region D) ≤ 0.70. , 0.20 ≤ (total of the volume of the region A and the volume of the region C) / (total of the volume of the region A, the volume of the region B, the volume of the region C, and the volume of the region D) ≤ 0.50 It is more preferable to be satisfied.
By satisfying the relationship of (total of the volume of the region A and the volume of the region C) / (the total of the volume of the region A, the volume of the region B, the volume of the region C, and the volume of the region D) ≤ 0.70. The ratio of the region that induces twisting to the entire handle body 2 can be reduced, and twisting can be made difficult.

FIG. 3 is a partially enlarged front view of a part of the head portion 3 and the neck portion 4.
As shown in FIG. 3, in front view, a point P11 on one side edge of the head portion 3 located on the rearmost end side where the length in the width direction of the head portion 3 is maximum, and the width direction of the neck portion 4. The line segment S1 connecting the point P12 located on the most distal end side where the length of the head portion 3 is the minimum, and the both side edges of the head portion 3 located on the rearmost end side where the length in the width direction of the head portion 3 is maximum. Of the angles at which the line segments S2 connecting the points intersect, the angle α on the smaller side is preferably 40 ° or more and 60 ° or less.
By setting the angle α at which the line segment S1 and the line segment S2 intersect to 40 ° or more and 60 ° or less, the width on the rear end side of the head portion 3 converges sharply, and the neck portion 4 is the finest. The length until it becomes can be reduced and the operability can be improved.

As shown in FIG. 3, when viewed from the front, the point P11 on one side edge of the head portion 3 located on the rearmost end side where the length in the width direction of the head portion 3 is maximum, and the width direction of the neck portion 4. Both sides of the line segment S3 connecting the point P13 located on the rearmost end side where the length of the head portion 3 is the minimum and the head portion 3 located on the rearmost end side where the length in the width direction of the head portion 3 is the maximum. Of the angles at which the line segments S2 connecting the points intersect with each other, the angle β on the smaller side is preferably 75 ° or more and 85 ° or less.
By setting the angle β at which the line segment S3 and the line segment S2 intersect to 75 ° or more and 85 ° or less, the length of the neck portion 4 to be the finest can be secured and the operability can be improved.

FIG. 4 is a partially enlarged front view of the head portion 3 and the neck portion 4.
As shown in FIG. 4, in front view, a point P14 on one side edge of the head portion 3 located on the most distal end side where the length in the width direction of the head portion 3 is maximum, and a point P14 in the width direction of the neck portion 4. The line segment S4 connecting the point P12 located on the most tip side with the minimum length and the points on both side edges of the head portion 3 located on the most tip side with the maximum length in the width direction of the head portion 3 Of the angles at which the line segments S5 connecting the two intersect, the angle γ on the smaller side is preferably 70 ° or more and 80 ° or less.
By setting the angle γ at which the line segment S4 and the line segment S5 intersect to 70 ° or more and 80 ° or less, the thin region becomes the long head portion 3, so that the back of the back teeth can be easily brushed.

As shown in FIG. 4, in front view, a point P14 on one side edge of the head portion 3 located on the most distal end side where the length in the width direction of the head portion 3 is maximum, and a point P14 in the width direction of the neck portion 4. A line segment S6 connecting the point P13 located on the rearmost end side having the minimum length and a point on both side edges of the head portion 3 located on the most distal end side having the maximum length in the width direction of the head portion 3. Of the angles at which the line segments S5 connecting the two intersect, the angle Δ on the smaller side is preferably 80 ° or more and 85 ° or less.
By setting the angle Δ at which the line segment S6 and the line segment S5 intersect to 80 ° or more and 85 ° or less, the thin region becomes the long head portion 3, so that the back of the back teeth can be easily brushed. Further, it is possible to prevent the neck portion 4 from becoming excessively long, and to polish the neck portion 4 without excessive bending.

As described above, in the toothbrush 1 of the present embodiment, it is possible to provide a wide head type toothbrush capable of suppressing the neck portion 4 from bending in the width direction or twisting in the circumferential direction centered on the long axis direction.

[Example]
Hereinafter, the effects of the present invention will be further clarified by examples. The present invention is not limited to the following examples, and can be appropriately modified and implemented without changing the gist thereof.

(Examples 1 to 9, Comparative Examples 1 to 2)
In this example, toothbrush samples of Examples 1 to 9 and Comparative Examples 1 and 2 were prepared according to the specifications shown in [Table 1] below.
Each part of the toothbrush of each example has the dimensions shown in Table 1. Polypropylene (PP) resin was used as the hard resin of the handle body.

In each of the samples of Examples 1 to 9 and Comparative Examples 1 and 2, the maximum length in the width direction of the head portion is 15.0 mm, the length in the thickness direction of the head portion is a constant 3.0 mm, and the neck. The maximum length in the width direction of the portion was 4.0 mm, and the maximum length in the thickness direction of the neck portion was 4.0 mm.

[Evaluation method]
Ten specialized panels cleaned the oral cavity with the toothbrush samples of each example, and evaluated the "difficulty of bending in the width direction" and "feeling of being able to polish firmly without twisting" according to the following evaluation criteria. .. The following evaluations were made based on the average score of the 10 specialized panels. The average score of 10 specialized panels is "◎ (Very Good)" with an average score of 5.5 points or more, "○ (Good)" with an average score of 4.0 points or more and less than 5.5 points, and an average score of 3.0 points. A score of less than 4.0 points was defined as "Δ (Not Bad)", and an average score of less than 3.0 points was designated as "x (Bad)".

(1) Difficulty of bending in the width direction [evaluation criteria]
7 points: Very hard to bend.
6 points: Very hard to bend.
5 points: Slightly hard to bend.
4 points: I can't say either.
3 points: Slightly flexible but acceptable.
2 points: Very easy to bend.
1 point: Very easy to bend.

(2) Feeling that you can polish firmly without twisting 7 points: You can polish firmly without twisting at all.
6 points: Can be polished firmly with almost no twist.
5 points: Can be polished firmly without twisting too much.
4 points: I can't say either.
3 points: It is a little twisted and cannot be polished firmly, but it is acceptable.
2 points: It is twisted considerably and cannot be polished firmly.
1 point: It is very twisted and cannot be polished firmly.

As shown in [Table 1], the maximum length of the head portion in the width direction is 12 mm or more and 18 mm or less, the maximum length of the head portion in the thickness direction is 2 mm or more and 4 mm or less, and the neck. The minimum length in the width direction and the minimum length in the thickness direction of the portion are 3 mm or more and 5 mm or less, satisfying the relationship of (volume of region D) / (volume of region C) ≧ 1.0, and the region. In the toothbrush samples of Examples 1 to 9, the maximum length in the width direction at the fourth position, which is the position of the rear end side end of D, is larger than the maximum length in the thickness direction, "difficulty in bending in the width direction". Good evaluation was obtained in both "feeling that it can be polished firmly without twisting".

Further, in the toothbrush samples of Examples 3 to 4 and 9 satisfying the relationship of (volume of region A) / (volume of region D) ≤ 0.60, "difficulty in bending in the width direction" and "not twisting". Good evaluation was obtained in both of "feeling that it can be polished firmly".

Further, in the toothbrush samples of Examples 5 to 6 and 9 in which the volume of the region D is 1000 mm ³ or more, both "difficulty in bending in the width direction" and "feeling of being able to polish firmly without twisting" are evaluated well. was gotten.

Further, the implementation that satisfies the relationship of (total of the volume of the region A and the volume of the region C) / (the total of the volume of the region A, the volume of the region B, the volume of the region C, and the volume of the region D) ≤ 0.70. In the toothbrush samples of Examples 2 to 7 and 9, good evaluations were obtained in terms of both "difficulty in bending in the width direction" and "feeling of being able to polish firmly without twisting".

Further, the maximum length in the width direction at the fourth position is 11 mm or more, and (maximum length in the width direction at the fourth position)-(maximum length in the thickness direction at the fourth position) ≥ 2 mm. In the toothbrush samples of Examples 8 to 9 satisfying the relationship, good evaluations were obtained in both "difficulty in bending in the width direction" and "feeling of being able to polish firmly without twisting".

From the above results, the toothbrush sample of Example 9 was evaluated particularly well in both "difficulty in bending in the width direction" and "feeling that it can be polished firmly without twisting", followed by Examples 2 and 6. A better evaluation was obtained with a toothbrush sample.

On the other hand, Comparative Example 1 which does not satisfy the relationship of (volume of region D) / (volume of region C) ≧ 1.0, and the maximum length in the width direction at the fourth position which is the position of the rear end side end portion of the region D. In Comparative Example 2 in which the thickness is smaller than the maximum length in the thickness direction, good evaluations were not obtained in both "difficulty in bending in the width direction" and "feeling of being able to polish firmly without twisting".

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. The various shapes and combinations of the constituent members shown in the above-mentioned example are examples, and can be variously changed based on design requirements and the like within a range not deviating from the gist of the present invention.

The present invention can be applied to a toothbrush.

1 ... toothbrush, 3 ... head part, 3a ... flocked surface, 4 ... neck part, 5 ... grip part, 6 ... flocked hole

Claims

The head part, which is located on the tip side in the long axis direction and has a flocked surface,
A grip portion arranged on the rear end side of the head portion and
It has a neck portion arranged between the head portion and the grip portion, and has.
The maximum length of the head portion in the width direction parallel to the flocked surface and orthogonal to the long axis direction is 12 mm or more and 18 mm or less.
The maximum length of the head portion in the thickness direction orthogonal to the flocked surface is 2 mm or more and 4 mm or less.
The minimum length of the neck portion in the width direction and the minimum length in the thickness direction are 3 mm or more and 5 mm or less.
In the head portion, the region from the tip end in the major axis direction to the first position on the rearmost end side where the length in the width direction is maximum is defined as A, and the head portion and the neck portion are formed from the first position. Let B be the area up to the second position of the boundary of
In the neck portion, the region from the second position to the third position, which is 65% of the length of the neck portion in the long axis direction, is defined as C, and from the third position, the neck portion is described. Assuming that the region up to the fourth position of the boundary between the neck portion and the grip portion, which is 35% of the length in the major axis direction, is D, (volume of region D) / (volume of region C) ≧ 1 Satisfying the relationship of .0,
A toothbrush characterized in that, at the fourth position, the maximum length in the width direction is larger than the maximum length in the thickness direction.
Satisfying the relationship of (volume of the region A) / (volume of the region D) ≤ 0.60.
The toothbrush according to claim 1.
The volume of the region D is 1000 mm 3 or more.
The toothbrush according to claim 1 or 2.
(Total of the volume of the region A and the volume of the region C) / (Total of the volume of the region A, the volume of the region B, the volume of the region C, and the volume of the region D) ≤ 0.70 Satisfy,
The toothbrush according to any one of claims 1 to 3.
The maximum length in the width direction at the fourth position is 11 mm or more, and the maximum length is 11 mm or more.
Satisfying the relationship of (maximum length in the width direction at the fourth position)-(maximum length in the thickness direction at the fourth position) ≥ 2 mm.
The toothbrush according to any one of claims 1 to 4.
Satisfying the relationship of 1.5 mm ≤ (maximum length of the region A in the width direction)-(maximum length of the region A in the width direction) ≤ 7 mm.
The toothbrush according to any one of claims 1 to 5.
(Maximum length in the thickness direction at the fourth position)-(Maximum length in the thickness direction at the third position) ≧ 3 mm
Satisfy the relationship,
The toothbrush according to any one of claims 1 to 6.
(Maximum length in the thickness direction at the third position)-(Average value of the length of the region A over the long axis direction in the thickness direction) ≤ 2 mm
Satisfy the relationship,
The toothbrush according to any one of claims 1 to 7.
The region C has a maximum length of 4.5 mm or less in the thickness direction over the long axis direction.
(Maximum length in the width direction at the third position)-(Maximum length in the thickness direction at the third position)> 1 mm is satisfied.
The toothbrush according to any one of claims 1 to 8.