WO2022137971A1 - 歯ブラシ - Google Patents

歯ブラシ Download PDF

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Publication number
WO2022137971A1
WO2022137971A1 PCT/JP2021/043227 JP2021043227W WO2022137971A1 WO 2022137971 A1 WO2022137971 A1 WO 2022137971A1 JP 2021043227 W JP2021043227 W JP 2021043227W WO 2022137971 A1 WO2022137971 A1 WO 2022137971A1
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WO
WIPO (PCT)
Prior art keywords
region
length
volume
width direction
maximum length
Prior art date
Application number
PCT/JP2021/043227
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
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 (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ライオン株式会社 filed Critical ライオン株式会社
Priority to KR1020237008837A priority Critical patent/KR20230120631A/ko
Priority to CN202180086247.8A priority patent/CN116634904A/zh
Publication of WO2022137971A1 publication Critical patent/WO2022137971A1/ja

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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • 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.
  • toothbrush head sizes There are various types of toothbrush head sizes according to the taste and purpose of the user.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • the volume of the region D is 1000 mm 3 or more.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 1 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.
  • FIGS. 1 to 4 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.
  • the side of the head portion 3 where the flocked surface 3a is provided 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.
  • 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
  • the direction orthogonal to the hair-planted surface 3a is the thickness of the toothbrush 1. It will be explained as an orthogonal direction.
  • 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
  • the side where the grip portion 5 is provided 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.
  • 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.
  • 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.
  • JIS7171 flexural modulus
  • POM polyacetal
  • PBT polybutylene terephthalate
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the ratio of the total volume of the flocked holes 6 to the resin volume of the flocked region is 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the finger pad portion 50 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.
  • 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.
  • 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.
  • 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.
  • the thickness is increased.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • the maximum length in the width direction is preferably larger than the maximum length in the thickness direction.
  • 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).
  • 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.
  • 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.
  • the volume of the region A the volume of the hair follicle hole 6 (total hole volume) is excluded.
  • 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.
  • 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.
  • the volume of the region B the volume of the hair follicle hole 6 (total hole volume) is excluded.
  • 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.
  • 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.
  • 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).
  • FIG. 3 is a partially enlarged front view of a part of the head portion 3 and the neck portion 4.
  • the angle ⁇ on the smaller side is preferably 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.
  • the angle ⁇ on the smaller side is preferably 75 ° or more and 85 ° or less.
  • FIG. 4 is a partially enlarged front view of the head portion 3 and the neck portion 4.
  • the angle ⁇ on the smaller side is preferably 70 ° or more and 80 ° or less.
  • the angle ⁇ on the smaller side is preferably 80 ° or more and 85 ° or less.
  • the angle ⁇ at which the line segment S6 and the line segment S5 intersect 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.
  • 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.
  • 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.
  • 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
  • the neck The maximum length in the width direction of the portion was 4.0 mm
  • the maximum length in the thickness direction of the neck portion was 4.0 mm.
  • 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
  • the neck is 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.
  • 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".
  • 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".
  • 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.
  • 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.
  • 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.
  • 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.
  • 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".
  • the present invention can be applied to a toothbrush.

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PCT/JP2021/043227 2020-12-24 2021-11-25 歯ブラシ WO2022137971A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030016440A (ko) * 2001-08-16 2003-03-03 주식회사 엘지생활건강 유체를 주입할 수 있는 손잡이를 가지는 칫솔
JP2007075514A (ja) * 2005-09-16 2007-03-29 Lion Corp 歯ブラシおよび歯ブラシパッケージ
WO2017155033A1 (ja) * 2016-03-09 2017-09-14 ライオン株式会社 歯ブラシ
WO2018079114A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ
WO2020095867A1 (ja) * 2018-11-08 2020-05-14 ライオン株式会社 歯ブラシ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6564164B2 (ja) 2014-07-01 2019-08-21 小林製薬株式会社 歯ブラシ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030016440A (ko) * 2001-08-16 2003-03-03 주식회사 엘지생활건강 유체를 주입할 수 있는 손잡이를 가지는 칫솔
JP2007075514A (ja) * 2005-09-16 2007-03-29 Lion Corp 歯ブラシおよび歯ブラシパッケージ
WO2017155033A1 (ja) * 2016-03-09 2017-09-14 ライオン株式会社 歯ブラシ
WO2018079114A1 (ja) * 2016-10-28 2018-05-03 ライオン株式会社 歯ブラシ
WO2020095867A1 (ja) * 2018-11-08 2020-05-14 ライオン株式会社 歯ブラシ

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JP7550636B2 (ja) 2024-09-13
CN116634904A (zh) 2023-08-22
JP2022100465A (ja) 2022-07-06
KR20230120631A (ko) 2023-08-17
TW202228550A (zh) 2022-08-01
CN216932263U (zh) 2022-07-12

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