WO2022239598A1 - 歯ブラシ - Google Patents

歯ブラシ Download PDF

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Publication number
WO2022239598A1
WO2022239598A1 PCT/JP2022/017784 JP2022017784W WO2022239598A1 WO 2022239598 A1 WO2022239598 A1 WO 2022239598A1 JP 2022017784 W JP2022017784 W JP 2022017784W WO 2022239598 A1 WO2022239598 A1 WO 2022239598A1
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WIPO (PCT)
Prior art keywords
length
less
thickness direction
width direction
value represented
Prior art date
Application number
PCT/JP2022/017784
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English (en)
French (fr)
Japanese (ja)
Inventor
邦之 糸瀬
晃大 石川
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.)
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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 JP2023520935A priority Critical patent/JPWO2022239598A1/ja
Priority to KR1020237030347A priority patent/KR20240006495A/ko
Publication of WO2022239598A1 publication Critical patent/WO2022239598A1/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
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
    • 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
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • 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 toothbrushes.
  • This application claims priority based on Japanese Patent Application No. 2021-081747 filed in Japan on May 13, 2021, the content of which is incorporated herein.
  • the neck In a slim neck toothbrush, the neck is narrowed from the viewpoint of operability in the oral cavity. By forming thick, the neck avoids bending behavior from the rear end side.
  • Patent Document 1 by making the brush body S-shaped in side view, the shape after bending is closer to a "straight-shaped" toothbrush, and the operability is high, and the tooth gap is reduced. Disclosed is a toothbrush that achieves a brush body shape that facilitates cleaning.
  • the inventors of the present invention have found that, in the toothbrush as described above, while the head part can be moved more freely when brushing teeth by slimming the neck part, there is still a difference in tooth brushing techniques among users. Considering the fact that there is a difference, in order to apply the bristles from an appropriate angle according to the unevenness, rather than limiting the bending direction and bending amount, the head part can be easily moved to various angles. On the contrary, I found that it is desirable to do so.
  • the present invention has been made in consideration of the above points, and an object thereof is to provide a toothbrush that can obtain a good fit with an object to be cleaned without depending on how to brush and technique.
  • ⁇ 1> It has a flocked part made up of a plurality of tufts and a brush body extending in the longitudinal direction, the brush body having a hard part made of hard resin, and the hard part being on the tip side in the longitudinal direction. located between a head portion having the flocked portion provided on the flocked surface, a grip portion located on the rear end side of the head portion in the longitudinal direction, and the head portion and the grip portion a neck portion, wherein A is the position of the end of the neck portion on the leading end side in the longitudinal direction; B is the position of the end portion of the neck portion on the rear end side in the longitudinal direction; The length of the neck portion in the thickness direction at the position A and Each of the lengths in the width direction is 3.0 mm or more and 4.3 mm or less, and the length in the width direction of the neck portion at the position A is greater than the length in the width direction of the neck portion at the position B.
  • the length ratio is 0.30 or more and 0.60 or less, and the ratio of the length of the neck portion in the thickness direction at the position A to the length of the neck portion in the thickness direction at the position B is 0.30 or more and 0.60 or less, and the bending of the brush body in the width direction measured by the following method ( ⁇ ) and the bending of the brush body measured by the following method ( ⁇ )
  • ⁇ The brush in a state where the position that is 40% of the length of the gripping portion in the long axis direction from the tip end of the gripping portion in the longitudinal direction to the rear end side is fixed.
  • a load of 200 g is further applied in the width direction to the central position of the hair-implanted portion in the longitudinal direction of the head portion in the fixed state, and the starting point of bending after 10 seconds.
  • the position and the amount of displacement (unit: mm) in the width direction of the tip of the brush body from the reference height are measured as the bending length.
  • a load of 200 g is further applied in the thickness direction to the central position of the flocked portion in the longitudinal direction of the head portion, and the bending after 10 seconds is measured.
  • the position of the starting point and the amount of displacement (unit: mm) in the thickness direction of the tip of the brush body from the reference height are measured as the bending length.
  • ⁇ 2> The toothbrush according to ⁇ 1>, wherein the bending length in the width direction and the bending length in the thickness direction are both 6.0 mm or more and 11.0 mm or less.
  • D mm be the length in the thickness direction of the neck portion
  • W mm be the length in the width direction
  • WD 3 (A) mm 4 be the value represented by W ⁇ D 3 at position A
  • WD 3 (A) mm 4 at position B
  • the value represented by W ⁇ D 3 is WD 3 (B) mm 4
  • the value represented by D ⁇ W 3 at position A is DW 3 (A) mm 4
  • the value represented by D ⁇ W 3 at position B is WD 3 (B) is 1200 mm 4 or more and 6500 mm 4 or less
  • the value represented by WD 3 ( A)/WD 3 ( B) is 0 0.01 or more and 0.20 or less
  • DW 3 (B) is 1200 mm 4 or more and 6500 mm 4 or less
  • the value represented by DW 3 (A)/DW 3 (B) is 0.01 or more , 0.20 or less, the toothbrush according to any one of ⁇ 1> to ⁇ 3>.
  • the gripping portion has a continuous area of at least 20% of the length in the longitudinal direction of the gripping portion, and both the length in the thickness direction and the length in the width direction are 4.5 mm or more and 8.0 mm.
  • the toothbrush according to any one of ⁇ 1> to ⁇ 4> below.
  • the position of the tip end of the gripping portion in the longitudinal direction is set to C, and the length of the gripping portion in the longitudinal direction is 50 from the tip end of the gripping portion to the rear end.
  • % is D
  • the length of the gripping portion in the thickness direction is D mm
  • the length in the width direction is W mm
  • the value represented by W ⁇ D 3 at position C is WD 3 (C ) mm 4
  • the value represented by W ⁇ D 3 at position D is WD 3 (D) mm 4
  • the value represented by D ⁇ W 3 at position C is DW 3 (C) mm 4
  • the position represented by D ⁇ W 3 in D is DW 3 (D) mm 4
  • WD 3 (C) is 410 mm 4 or more and 4000 mm 4 or less
  • WD 3 (C)/WD 3 (D) is 0.35 or more and 2.0 or less
  • DW 3 (C) is 410 mm 4 or more and 4000 mm 4 or less, and is expressed as
  • a ratio of the length of the gripping portion in the width direction at the position C to the length of the gripping portion in the width direction at the position D is 0.65 or more and 1.30 or less;
  • the toothbrush according to ⁇ 6>, wherein a ratio of the length of the grip portion in the thickness direction at the position C to the length of the grip portion in the thickness direction is 0.65 or more and 1.30 or less.
  • Both the length in the thickness direction and the length in the width direction of the neck portion are constant or gradually increase in diameter from the front end side to the rear end side, and the neck portion has a length in the thickness direction and a length in the width direction. At least one of the lengths in the width direction has a position greater than the length in the thickness direction or the length in the width direction between the positions C and D in the gripping portion, and
  • the length in the thickness direction including the soft portion in the side view of the grip portion in the width direction is De
  • the length of the grip portion in the side view Let Dh be the length in the thickness direction, We be the length in the width direction including the soft portion in the front view of the gripping portion in the thickness direction, and We be the gripping portion in the front view.
  • Wh is the length in the width direction, the value represented by Dh/De is 0.75 or less, and the value represented by Wh/We is 0.75 or less, from ⁇ 1>
  • the toothbrush can obtain a good fit with the object to be cleaned, regardless of the brushing method and technique.
  • FIG. Fig. 2 is a front view of the toothbrush 1 viewed from the side of the flocked surface 3a; 4 is a side view showing the configuration of a hard portion 60; FIG. Fig. 3 is a front view of a hard portion 60 viewed from the flocked surface 3a side;
  • FIG. 1 An embodiment of the toothbrush of the present invention will be described below with reference to FIGS. 1 to 4.
  • FIG. 1 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. Also, in the drawings below, in order to make each configuration easier to understand, the actual structure and each structure are different in scale, number, and the like.
  • the side of the head portion 3 on which the flocked surface 3a of the head portion 3 is provided is the front side of the toothbrush 1, and the side facing the flocked surface 3a of the head portion 3 is opposite to the front side of the toothbrush 1.
  • side is the back side of the toothbrush 1.
  • the direction parallel to the flocked surface 3a and in which the brush body 2 described later extends is defined as the longitudinal direction
  • the direction parallel to the flocked surface 3a and perpendicular to the longitudinal direction is defined as the width direction of the toothbrush 1, and the flocked surface.
  • the direction orthogonal to 3a is described as the thickness direction of the toothbrush 1. As shown in FIG.
  • the side on which the head portion 3 is provided (the side of the head portion 3) in the long axis direction will be referred to as the front end side
  • the side on which the grip portion 5 is provided (the side of the grip portion 5) will be referred to as the rear end side.
  • FIG. 1 is a diagram showing the configuration of the toothbrush 1, and is a side view of the toothbrush 1 viewed in the width direction.
  • FIG. 2 is a front view of the toothbrush 1 viewed from the bristle-implanted surface 3a side in the thickness direction. 2, illustration of the flocked portion 40 is omitted.
  • the toothbrush 1 of this embodiment includes a brush body 2 made of a resin molded body formed in an elongated shape as a whole, and a bristle portion 40 .
  • the brush body 2 includes a head region 3R having a flocked surface 3a located on the tip side, a gripping region 5R disposed on the rear end side of the head region 3R, and disposed between the head region 3R and the gripping region 5R. It has a neck region 4R.
  • the toothbrush 1 can clean the inside of the oral cavity with the bristle portion 40 having a plurality of bristle bundles (not shown) planted on the bristle-planted surface 3a of the head region 3R.
  • the brush body 2 has a hard portion 60 made of hard resin and a soft portion 70 made of soft resin.
  • the hard portion 60 extends in the longitudinal direction.
  • Rigid portion 60 forms at least part of head region 3R, neck region 4R and grip region 5R.
  • the soft portion 70 forms part of the grip region 5R.
  • the soft portion 75 partially covers the hard portion 60 in the gripping region 5R.
  • the hard portion 60 includes the head portion 3 positioned in the head region 3R, the neck portion 4 positioned in the neck region 4R, and the grip portion 5 positioned in the grip region 5R.
  • hard resins examples include resins having a flexural modulus (JIS7171) of 1000 MPa or more and 2800 MPa or less, such as polypropylene (PP) resin, polyacetal (POM) resin, polybutylene terephthalate (PBT) resin, It is preferable to use it in consideration of strength.
  • the flexural modulus is more preferably 1000-2000 MPa, and PP resin is preferred.
  • the soft resin preferably has a Shore hardness A of 30 or more and 80 or less.
  • Soft resins include, for example, elastomers (eg, olefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based thermoplastic elastomers, etc.) and silicones.
  • a first curved region F1 extending in an arc on the rear end side to 51A
  • a second curved region F2 having a center of curvature on the front side and extending in an arc from the vertex 51A on the rear end side, and a center of curvature on the back side.
  • a third curved region F3 extending rearward from the rear end of the second curved region F2, and a fourth curved region F4 having a center of curvature on the front side and extending rearward from the rear end of the third curved region F3.
  • a fifth curved region F5 extending from the rear end of the fourth curved region F4 to the rear end side having the center of curvature on the back side.
  • the head portion 3 extends from the rear end side of the head region 3R toward the gripping region 5R side.
  • a second linear region L2 that extends linearly from the rear surface toward the rear end
  • a sixth curved region F6 that has a center of curvature on the front side and extends in an arc from the rear end of the second linear region L2 toward the rear end.
  • a seventh curved region F7 having a center of curvature on the back side and extending in an arc from the rear end of the sixth curved region F6 to the vertex 51B;
  • a ninth curved region F9 having a center of curvature on the front side and extending in an arc from the rear end of the eighth curved region F8 to the rear end side, and a center of curvature on the back side.
  • a tenth curved region F10 that extends in an arc from the rear end of the ninth curved region F9 to the rear end side, and a tenth curved region F10 that has a center of curvature on the front side and arcs from the rear end to the rear end side of the tenth curved region F10 and an eleventh curved region F11 extending to .
  • the neck region 4R and the gripping region 5R in a side view extend in the direction toward the front side in the thickness direction toward the rear end side while being inclined with respect to the longitudinal direction.
  • the first curved region F1, the second curved region F2, the third curved region F3, the fourth curved region F4, and the fifth curved region F5 are located at the same position in the thickness direction as the hair-implanted surface 3a or in the thickness direction from the hair-implanted surface 3a. is also located on the front side.
  • the toothbrush 1 of the present embodiment is located at the center in the width direction and is located on both sides of the brush body 2 in the width direction with respect to the center line extending in the longitudinal direction.
  • the outer contour line is formed line symmetrically. Therefore, in the following description, the contour line on one side in the width direction (lower side in FIG. 2) will be described.
  • the center side in the width direction with respect to the contour line is called the inner side
  • the side opposite to the center in the width direction is called the outer side.
  • the outer contour line in the width direction of the brush body 2 extends from the boundary between the head region 3R and the neck region 4R (details will be described later) to the rear end side.
  • a third linear region L3 that extends linearly, a twelfth curved region F12 that has a center of curvature on the outside and extends in an arc from the rear end of the third linear region L3 toward the rear end, and a second curved region F12 that has the center of curvature on the inside.
  • a 13th curve area F13 that extends in an arc from the rear end of the 12th curve area F12 toward the rear end, and a 14th curve that has a center of curvature on the outside and extends in an arc from the rear end of the 13th curve area F13 toward the rear end. It has a region F14 and a fifteenth curved region F15 which has a center of curvature inside and extends arcuately from the rear end of the fourteenth curved region F14 to the rear end side.
  • the boundary between the head region 3R and the neck region 4R is the position A of the tip end of the third linear region L3.
  • the position A coincides with the boundary between the head portion 3 and the neck portion 4, which will be described later.
  • the boundary between the neck region 4R and the gripping region 5R is a position B where the contour line in a front view switches from the 12th curved region F12, in which the arc center is located on the outside, to the 13th curved region F13, in which the arc center is located on the inside. is.
  • Position B coincides with the boundary between neck portion 4 and grip portion 5, which will be described later. If the position where the outline changes is unclear, it is the position on the most tip side where the soft resin coating starts.
  • the boundary is common between front view and side view.
  • the grip region 5R is covered with a soft portion 74 over the entire circumference from the position B to the rear end side.
  • the hard portion 60 is exposed to the outside at the end on the rear end side and the design region 5A on the front side.
  • the entire periphery is covered with the soft portion 75 except for the end on the rear end side and the design area 5A.
  • the length of the gripping area 5R in the width direction has a maximum value in the 13th curved area F13 and the 15th curved area F15, and a minimum value in the 14th curved area F14.
  • the length of the gripping region 5R in the thickness direction is between the maximum value shown between the vertices 51A and 51B in side view and the length between the second curved region F2 and the eighth curved region F8. Decrease to the position showing the local minimum.
  • the length of the gripping region 5R in the thickness direction changes from the minimum value between the second curved region F2 and the eighth curved region F8 to the maximum between the third curved region F3 and the ninth curved region F9. Increments to the position indicated by the value.
  • the length of the gripping region 5R in the thickness direction is minimal between the fourth curved region F4 and the tenth curved region F10 from the maximum value between the third curved region F3 and the ninth curved region F9.
  • the length of the gripping region 5R in the thickness direction is the minimum between the fourth curved region F4 and the tenth curved region F10 and the maximum between the fifth curved region F5 and the eleventh curved region F11. After increasing to the position indicating the value, it decreases toward the rear end side.
  • the region of the second curved region F2 extending from the vertex 51A toward the rear side toward the back side and the region of the eighth curved region F8 extending toward the front side from the vertex 51B toward the rear end side are defined by the user. It constitutes a finger rest part when the region 5R is gripped.
  • FIG. 3 is a side view showing the configuration of the hard portion 60.
  • FIG. 4 is a front view of the hard portion 60 viewed from the flocked surface 3a side.
  • the hard portion 60 includes the head portion 3 , the gripping portion 5 located on the rear end side of the head portion 3 in the longitudinal direction, and a portion between the head portion 3 and the gripping portion 5 . and a neck portion 4 located at the .
  • the head part 3 is a part that sweeps the inside of the oral cavity with a plurality of tufts of bristles, and as shown in FIG. 4, has a substantially rectangular parallelepiped shape with rounded corners.
  • the head portion 3 has a substantially quadrilateral plate-like shape in which four top portions are corner-cut with curved lines when viewed from the front.
  • 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 bend of the curve forming the corner cut. It is the position A where the direction changes.
  • the head portion 3 has a flocked surface 3a on the front side.
  • a plurality of tufting holes 6 are arranged side by side on the tufting surface 3a.
  • the shape and hole diameter of the tufting holes 6 are not particularly limited. Hair tufts constituting a hair-planting portion 40 are planted in the planting holes 6 respectively.
  • the head portion 3 is not covered with the soft portion 70 . That is, the head portion 3 is entirely exposed.
  • the head region 3R is configured by the head portion 3. As shown in FIG.
  • Each tufting hole 6 is formed by bundling a plurality of brushes (filaments) and folding them in two, inserting a metal stopper (not shown) called a flat wire between them, and driving it into each tufting hole 6. 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 shape and size of the head portion 3 are not particularly limited as long as they are easy to clean the oral cavity, and the shape is not particularly limited. may be Moreover, the head portion 3 may have a tapered shape in which the thickness is gradually reduced from the base end side to the tip end side, and the head portion 3 may have a rounded shape in which the central portion on the back side of the head portion 3 is raised. good too.
  • the width of the head portion 3 is not particularly limited, and is preferably 7 mm or more and 16 mm or less, for example. If it is at least the above lower limit, a sufficient area for implanting the hair bundle can be ensured, and if it is at most the above upper limit, operability in the oral cavity can be further enhanced. If the head portion 3 has a width of 12 mm or more and is a wide head, it is easy to apply force to twist the head portion 3 when performing cleaning by a rolling method/bath method, which will be described later.
  • the length in the longitudinal direction of the head portion 3 is not particularly limited, and is preferably 10 mm or more and 33 mm or less, for example. If the length of the head portion 3 is at least the above lower limit value, a sufficient area for implanting the hair bundle can be secured, and if it is at most the above upper limit value, the operability in the oral cavity can be further enhanced.
  • the length of the head portion 3 in the thickness direction is set within a range of 2.5 mm or more and 4.5 mm or less, for example. More preferably, the length of the head portion 3 in the thickness direction is 2.5 mm or more and 4.0 mm or less. More preferably, the length of the head portion 3 in the thickness direction is 2.5 mm or more and 3.7 mm or less. The lower limit of the length of the head portion 3 in the thickness direction is preferably 2.5 mm or more. The upper limit of the length of the head portion 3 in the thickness direction is preferably 4.5 mm or less, more preferably 4.0 mm or less, and even more preferably 3.7 mm or less.
  • the neck portion 4 is a portion that is arranged between the grip portion 5 and the head portion 3 and connects the grip portion 5 and the head portion 3 .
  • the longitudinal length of the neck portion 4 is preferably 35.0 mm or more and 50.0 mm or less, more preferably 37.0 mm or more and 48.0 mm or less.
  • the lower limit of the length of the neck portion 4 in the longitudinal direction is preferably 36.0 mm or more, more preferably 37.0 mm or more.
  • the upper limit of the length of the neck portion 4 in the longitudinal direction is preferably 50.0 mm or less, more preferably 48.0 mm or less. Both the length in the thickness direction and the length in the width direction of the neck portion 4 are constant or gradually increase in diameter from the front end side to the rear end side.
  • the contour of the tip side of the neck portion 4 has a constant width formed by the third linear region L3.
  • the length in the major axis direction of the third linear region L3 is preferably 18.0 mm or more and 35.0 mm or less, more preferably 20.0 mm or more and 30.0 mm or less.
  • the lower limit of the length of the third linear region L3 in the longitudinal direction is preferably 18.0 mm or more, more preferably 20.0 mm or more. 35.0 mm or less is preferable and, as for the upper limit of the length of the major axis direction of the 3rd linear area
  • the contour of the neck portion 4 on the rear end side of the third linear region L3 is formed by a twelfth curved region F12.
  • the length of the neck portion 4 formed in the twelfth curved region F12 in the width direction gradually increases toward the rear end side up to the end position B on the rear end side. That is, the widthwise length of the neck portion 4 is maximized at the position B.
  • Position B is the boundary between the neck portion 4 and the grip portion 5 .
  • the contour of the neck portion 4 on the front side is formed by the first curved region F1.
  • the outline of the front side of the neck portion 4 gradually extends toward the front side toward the rear end side.
  • the contour of the back side of the neck portion 4 is formed by the sixth curved region F6.
  • the contour of the back side of the neck portion 4 gradually extends toward the front side toward the rear end side.
  • the length of the first curved region F1 toward the front side toward the rear end side is longer than the length of the sixth curved region F6 toward the front side toward the rear end side. Therefore, the length of the neck portion 4 in the thickness direction increases toward the rear end side.
  • the contour of the front side of the neck portion 4 does not form the first curved region F1 or the sixth curved region F6 from the position A. may be connected to In this case, the length of the linear region is preferably 15.0 mm or less.
  • the grip portion 5 extends in a direction toward the front side as it goes from the position C of the end on the front end side toward the rear end side.
  • Position C is the same position or substantially the same position as position B of the end portion on the rear end side of neck portion 4 .
  • the substantially identical position is defined as substantially identical when the position C is within the distance from the position B to the position 0.2 mm on the rear end side in the long axis direction.
  • the length of the grip portion 5 in the thickness direction at the position C has a region that is shorter than the length of the neck portion 4 in the thickness direction.
  • the length of the gripping portion 5 in the thickness direction is shorter than the length of the rear end portion of the neck portion 4 in the thickness direction. Approximately constant and elongated.
  • the grip portion 5 has a projecting portion 5B projecting to the front side at the position of the design area 5A in the longitudinal direction.
  • the front end face of the protrusion 5B is exposed in the grip region 5R.
  • a rear end of the grip portion 5 is provided with a protrusion 5C exposed at the rear end of the grip region 5R.
  • the length of the grip portion 5 in the width direction is preferably 4.5 mm or more and 14.0 mm or less, more preferably 4.5 mm or more and 12.0 mm or less, in the entire region of the grip portion 5 .
  • the lower limit of the length of the grip portion 5 in the width direction is 4.5 mm or more.
  • the upper limit of the length of the grip portion 5 in the width direction is preferably 14.0 mm or less, more preferably 12.0 mm or less.
  • the length of the grip portion 5 in the thickness direction is preferably 4.5 mm or more and 18.0 mm or less, more preferably 4.5 mm or more and 16.0 mm or less, over the entire area of the grip portion 5 .
  • the lower limit of the length of the grip portion 5 in the thickness direction is preferably 4.5 mm or more.
  • the upper limit of the length of the grip portion 5 in the thickness direction is preferably 18.0 mm or less, more preferably 16.0 mm or less.
  • the length of the grip portion 5 in the longitudinal direction is preferably 80 mm or more and 140 mm or less, and more preferably 90 mm or more and 130 mm or less. It is preferable that the lower limit of the length of the grip portion 5 in the longitudinal direction is 90 mm or more.
  • the upper limit of the length of the grip portion 5 in the major axis direction is preferably 140 mm or less, more preferably 130 mm or less. This range is a range including protrusions 5B and 5C in FIGS. As will be described later, the grip portion 5 has a continuous region with a length in the thickness direction and a length in the width direction of 4.5 mm or more and 8.0 mm or less.
  • the length in the thickness direction and the length in the width direction of the neck portion 4 at the position A are both 3.0 mm or more and 4.3 mm or less. If both the length in the thickness direction and the length in the width direction of the neck portion 4 at the position A are less than 3.0 mm, the neck portion 4 will bend excessively and move too much. If both the length in the thickness direction and the length in the width direction of the neck portion 4 at the position A exceed 4.3 mm, sufficient bending cannot be obtained. Moderate bending can be realized by setting the length in the thickness direction and the length in the width direction of the neck portion 4 at the position A to 3.0 mm or more and 4.3 mm or less. More preferably, the length in the thickness direction and the length in the width direction of the neck portion 4 at the position A are both 3.0 mm or more and 4.0 mm or less.
  • the ratio of the length of the neck portion 4 in the width direction at the position A to the length of the neck portion 4 in the width direction at the position B is preferably 0.30 or more and 0.60 or less, more preferably 0.40 or more and 0. It is more preferably 0.50 or less.
  • the lower limit of the ratio of the widthwise length of the neck portion 4 at the position A to the widthwise length of the neck portion 4 at the position B is preferably 0.30 or more, more preferably 0.40 or more.
  • the upper limit of the ratio of the widthwise length of neck portion 4 at position A to the widthwise length of neck portion 4 at position B is preferably 0.60 or less, more preferably 0.50 or less.
  • the ratio of the length in the thickness direction of neck portion 4 at position A to the length in the thickness direction of neck portion 4 at position B is preferably 0.30 or more and 0.60 or less, and is preferably 0.40 or more. , is more preferably 0.50 or less.
  • the lower limit of the ratio of the length of the neck portion 4 in the thickness direction at the position A to the length of the neck portion 4 in the thickness direction at the position B is preferably 0.30 or more, more preferably 0.40 or more.
  • the upper limit of the ratio of the length of the neck portion 4 in the thickness direction at the position A to the length of the neck portion 4 in the thickness direction at the position B is preferably 0.60 or less, more preferably 0.50 or less.
  • the ratio of the widthwise length of the neck portion 4 at position A to the widthwise length of the neck portion 4 at position B, or the length of the neck portion 4 at position A to the thickness direction length of the neck portion 4 at position B If the length ratio in the thickness direction is less than 0.30, the tip is too thin and the stress concentrates on the tip. Can not. Alternatively, the rear end is too thick, and only the neck portion 4 bends without interlocking with the grip portion 5 . On the other hand, when the ratio of the lengths in the width direction or the length in the thickness direction exceeds 0.60, the rear end of the neck portion 4 becomes thin, and the neck portion does not move in conjunction with the grip portion 5. Only the entirety of 4 will flex excessively.
  • the tip of the neck portion 4 becomes thicker, and the tip of the neck portion 4 is less likely to bend. Therefore, by setting the length ratio in the width direction and the length ratio in the thickness direction to 0.30 or more and 0.60 or less, the entire neck portion 4 can move in conjunction with the grip portion 5. deflection can be achieved. It is more preferable that the width-direction length ratio and the thickness-direction length ratio be 0.40 or more and 0.50 or less.
  • the above-mentioned brush body 2 (toothbrush 1) is fixed at a position that is 40% of the length in the longitudinal direction of the grip portion 5 on the rear end side from the tip end (position C) of the grip portion 5,
  • a load of 200 g is applied in the width direction or a load of 200 g is applied in the thickness direction to the central position of the long axis direction of the flocked portion 40, out of the bending in the width direction and the bending in the thickness direction, At least one side bends with the grip portion 5 as a starting point. That is, when the load is applied to the above position, the brush body 2 bends from the grip portion 5 in at least one of the width direction and the thickness direction without bending only the neck portion 4 .
  • methods for determining the bending starting position and bending length of the brush body 2 in the width direction and the thickness direction will be described in detail.
  • the bending starting point position and bending length of the brush body 2 in the width direction are measured by the following method ( ⁇ ).
  • the amount of displacement (unit: mm) in the width direction from the is measured as the bending length.
  • the bending starting point position and bending length of the brush body 2 in the width direction are measured as follows.
  • the grip portion 5 is fixed using a jig 100 so that the width direction of the brush body 2 is the vertical direction.
  • the jig 100 is fixed at a position P1, which is 40% of the length of the gripping portion 5 in the longitudinal direction, from the tip end (position C) of the gripping portion 5 to the rear end side.
  • the height of the tip of the brush body 2 is defined as a reference height H0.
  • Position S is the center position of the hair-implanted portion 40 in the head portion 3 in the longitudinal direction.
  • the central position of the bristle portion 40 in the longitudinal direction is the central position between the outer edge of the plurality of tufting holes 6 on the frontmost side in the longitudinal direction and the outer edge on the rearmost side in the longitudinal direction. indicates Then, the amount of displacement (in mm) from the height H0 to the height H1 is obtained. The above measurements are performed five times, and the average value of the displacement amounts is obtained as the bending length of the brush body 2 in the width direction.
  • the bending starting position and bending length of the brush body 2 in the thickness direction are measured by the following method ( ⁇ ).
  • a load of 200 g is applied in the width direction to the center position of the long axis direction of the flocked part in the head part, and after 10 seconds, the starting point position of the bending in the thickness direction and the reference height of the tip of the brush body 2
  • the amount of displacement in the thickness direction from the height (unit: mm) is measured as the bending length.
  • the bending starting point position and bending length of the brush body 2 in the thickness direction are measured as follows. As shown in FIG. 1, the grip portion 5 is fixed using a jig 100 so that the thickness direction of the brush body 2 is the vertical direction.
  • the jig 100 is fixed at a position P1, which is 40% of the length of the gripping portion 5 in the longitudinal direction, from the tip end (position C) of the gripping portion 5 to the rear end side.
  • the height of the tip of the brush body 2 is defined as a reference height H0.
  • the weight 102 of 200 g is suspended at the above position S, and the starting position of bending of the brush body 2 after 10 seconds and the height H2 of the tip of the brush body 2 are measured. Then, the amount of displacement (in mm) from the height H0 to the height H2 is obtained.
  • the above measurements are performed five times, and the average value of the displacement amounts is obtained as the bending length of the brush body 2 in the thickness direction.
  • the neck portion 4 is thicker at position A and the ratio of the length of the neck portion 4 at position A to the length of the neck portion 4 at position B exceeds 0.60 in either the width direction or the thickness direction, the neck portion No deflection is realized at the tip of 4 . Further, when the neck portion 4 is thick at the position B in either the width direction or the thickness direction, and the ratio of the length of the neck portion 4 at the position A to the length of the neck portion 4 at the position B is less than 0.30, No deflection is realized at the rear end of the neck 4 .
  • the brush body 2 is that when the above load is applied to the above position, the head portion 3, the neck portion 4, and the grip portion 5 from the grip portion 5 bend in the width direction or the thickness direction with a large range of motion, starting from the grip portion 5. can be done.
  • the maximum bending length (maximum amount of deflection) of the tip end of the brush body 2 after 10 seconds from applying the above load is the load in the width direction, regardless of the bending starting position of the brush body 2. It is preferably 6.0 mm or more and 11.0 mm or less, more preferably 7.0 mm or more and 10.0 mm or less, both when applied and when applied in the thickness direction.
  • the lower limit of the maximum bending length (maximum amount of deflection) of the tip end of the brush body 2 10 seconds after the load is applied is preferably 6.0 mm or more, more preferably 7.0 mm or more. .
  • the upper limit of the maximum bending length (maximum amount of deflection) of the tip end of the brush body 2 10 seconds after the load is applied is preferably 11.0 mm or less, more preferably 10.0 mm or less. .
  • the bending length is less than 6.0 mm, the user cannot feel the bending sufficiently.
  • the head portion 3 can be easily moved, so that the fitting property during brushing is improved, and is particularly effective when the brushing method is the Phones method.
  • the front side and the back side of the range of 9 mm from the tip of the grip portion 5 to the rear end side of the grip portion are fixed, and further, the central position in the long axis direction of the tip of the head portion 3 to the flocked portion
  • the lower limit of the rotation angle is preferably 30° or more, more preferably 40° or more.
  • the upper limit of the rotation angle is preferably 50° or less.
  • the movable range in the rotation direction about the axis extending in the longitudinal direction of the head portion 3 during cleaning becomes narrow. If the rotation angle of the head portion 3 exceeds 50° when the above force is applied, the head portion 3 is twisted excessively in the direction of rotation about the axis extending in the longitudinal direction of the head portion 3 during cleaning, resulting in a stable fit. sex is not obtained.
  • the rotation angle of the head portion 3 is set to 30° or more and 50° or less when the force is applied, it is possible to sufficiently secure the twist of the head portion 3 during cleaning. Therefore, with the toothbrush 1 of the present embodiment, the bristles come into contact with the teeth at various angles during cleaning, and a good fit can be obtained particularly during the rolling method and the bath method.
  • the length in the thickness direction of the hard portion 60 is assumed to be D mm, and the length in the width direction thereof is assumed to be W mm.
  • WD 3 (B) is preferably 1200 mm 4 or more and 6500 mm 4 or less, more preferably 2400 mm 4 or more and 5200 mm 4 or less.
  • the lower limit of WD 3 (B) is preferably 1200 mm 4 or more, more preferably 2400 mm 4 or more.
  • the upper limit of WD 3 (B) is preferably 6500 mm 4 or less, more preferably 5200 mm 4 or less.
  • the values represented by WD 3 (A) and WD 3 (B) correspond to the geometrical moment of inertia at positions A and B when the neck portion 4 has a substantially rectangular cross section and a load is applied in the thickness direction. It indicates a value and correlates with the easiness of bending of the neck portion 4 in the thickness direction.
  • the value represented by WD 3 (A)/WD 3 (B) is preferably 0.01 or more and 0.20 or less, more preferably 0.03 or more and 0.06 or less.
  • the lower limit of the value represented by WD 3 (A)/WD 3 (B) is preferably 0.01 or more, more preferably 0.03 or more.
  • the upper limit of the value represented by WD 3 (A)/WD 3 (B) is preferably 0.20 or less, more preferably 0.06 or less.
  • WD 3 (A) is preferably 80 mm 4 or more and 350 mm 4 or less, and is 80 mm 4 or more and 260 mm 4 or less. is more preferable.
  • the lower limit of WD 3 (A) is preferably 80 mm 4 or more.
  • the upper limit of WD 3 (A) is preferably 350 mm 4 or less, more preferably 260 mm 4 or less.
  • the tip of the neck portion 4 bends in the thickness direction, and the thickness of the grip portion 5 as a whole increases. bending in the lateral direction cannot be realized.
  • the rear end of the neck portion 4 is too thick, and only the neck portion 4 bends without interlocking with the grip portion 5 . If the value represented by WD 3 (A)/WD 3 (B) exceeds 0.20, sufficient deflection in the thickness direction cannot be achieved at the tip of the neck portion 4 .
  • the rear end of the neck portion 4 becomes thin, and only the entire neck portion 4 bends excessively without interlocking with the grip portion 5 .
  • the value represented by WD 3 (A)/WD 3 (B) to 0.01 or more and 0.20 or less, the entire grip portion 5 can be bent in the thickness direction.
  • DW 3 ( B) is preferably 1200 mm 4 or more and 6500 mm 4 or less, more preferably 2400 mm 4 or more and 5200 mm 4 or less.
  • the lower limit of DW 3 (B) is preferably 1200 mm 4 or more, more preferably 2400 mm 4 or more.
  • the upper limit of DW 3 (B) is preferably 6500 mm 4 or less, more preferably 5200 mm 4 or less.
  • the values represented by DW 3 (A) and DW 3 (B) are values corresponding to the geometrical moment of inertia at positions A and B when the cross section of the neck portion 4 is substantially rectangular and a load is applied in the width direction. , which correlates with the flexibility of the neck portion 4 in the width direction.
  • the value represented by DW 3 (A)/DW 3 (B) is preferably 0.01 or more and 0.20 or less, more preferably 0.03 or more and 0.06 or less.
  • the lower limit of the value represented by DW 3 (A)/DW 3 (B) is preferably 0.01 or more, more preferably 0.03 or more.
  • the upper limit of the value represented by DW 3 (A)/DW 3 (B) is preferably 0.20 or less, more preferably 0.06 or less.
  • DW 3 (A) is preferably 80 mm 4 or more and 350 mm 4 or less, and is 80 mm 4 or more and 260 mm 4 or less. is more preferable.
  • the lower limit of DW 3 (A) is preferably 80 mm 4 or more.
  • the upper limit of DW 3 (A) is preferably 350 mm 4 or less, more preferably 260 mm 4 or less.
  • the value represented by DW 3 (A)/DW 3 (B) is less than 0.01, the bending in the width direction at the tip of the neck portion 4 increases, and the grip portion 5 as a whole expands in the width direction. deflection cannot be realized.
  • the rear end of the neck portion 4 is too thick, and only the neck portion 4 bends without interlocking with the grip portion 5 . If the value represented by DW 3 (A)/DW 3 (B) exceeds 0.20, sufficient bending in the width direction cannot be achieved at the tip of the neck portion 4 .
  • the rear end of the neck portion 4 becomes thin, and only the entire neck portion 4 bends excessively without interlocking with the grip portion 5 .
  • the value represented by DW 3 (A)/DW 3 (B) to 0.01 or more and 0.20 or less, the entire grip portion 5 can be flexed in the width direction.
  • the length in the width direction of the neck portion 4 at the position H is 3.0 mm or more and 4.5 mm or less. is preferred.
  • the length in the thickness direction of the neck portion 4 at the position H is preferably 5.0 mm or more and 6.5 mm or less.
  • D/W(H) which indicates the ratio of the length in the thickness direction to the length in the width direction of the neck portion 4 at the position H, is preferably 1.3 or more and 1.7 or less.
  • WD 3 (H ) is preferably 350 mm 4 or more and 1300 mm 4 or less, more preferably 500 mm 4 or more and 1000 mm 4 or less.
  • the lower limit of WD 3 (H) is preferably 350 mm 4 or more, more preferably 500 mm 4 or more.
  • the upper limit of WD 3 (H) is preferably 1300 mm 4 or less, more preferably 1000 mm 4 or less.
  • DW 3 (H) is preferably 130 mm 4 or more and 600 mm 4 or less, more preferably 200 mm 4 or more and 500 mm 4 or less.
  • the lower limit of DW 3 (H) is preferably 130 mm 4 or more, more preferably 200 mm 4 or more.
  • the upper limit of DW 3 (H) is preferably 600 mm 4 or less, more preferably 500 mm 4 or less.
  • the length in the width direction of neck portion 4 at position G is preferably 3.0 mm or more and 4.5 mm or less.
  • the length in the thickness direction of the neck portion 4 at the position G is preferably 4.0 mm or more and 5.5 mm or less.
  • D/W(G) which indicates the ratio of the length in the thickness direction to the length in the width direction of the neck portion 4 at the position G, is preferably 1.1 or more and 1.5 or less.
  • WD 3 (G ) is preferably 200 mm 4 or more and 750 mm 4 or less, more preferably 300 mm 4 or more and 600 mm 4 or less.
  • the lower limit of WD 3 (G) is preferably 200 mm 4 or more, more preferably 300 mm 4 or more.
  • the upper limit of WD 3 (G) is preferably 750 mm 4 or less, more preferably 600 mm 4 or less.
  • DW 3 (G) is preferably 100 mm 4 or more and 500 mm 4 or less, more preferably 150 mm 4 or more and 400 mm 4 or less.
  • the lower limit of DW 3 (G) is preferably 100 mm 4 or more, more preferably 150 mm 4 or more.
  • the upper limit of DW 3 (G) is preferably 500 mm 4 or less, more preferably 400 mm 4 or less.
  • the length in the width direction of neck portion 4 at position F is preferably 3.0 mm or more and 4.5 mm or less.
  • the length in the thickness direction of the neck portion 4 at the position F is preferably 3.5 mm or more and 4.5 mm or less.
  • D/W(F) which indicates the ratio of the length in the thickness direction to the length in the width direction of the neck portion 4 at the position F, is preferably 0.90 or more and 1.3 or less.
  • WD 3 (F ) is preferably 100 mm 4 or more and 400 mm 4 or less, more preferably 150 mm 4 or more and 300 mm 4 or less.
  • the lower limit of WD 3 (F) is preferably 100 mm 4 or more, more preferably 150 mm 4 or more.
  • the upper limit of WD 3 (F) is preferably 400 mm 4 or less, more preferably 300 mm 4 or less.
  • DW 3 (F) is preferably 90 mm 4 or more and 400 mm 4 or less, more preferably 130 mm 4 or more and 300 mm 4 or less.
  • the lower limit of DW 3 (F) is preferably 90 mm 4 or more, more preferably 130 mm 4 or more.
  • the upper limit of DW 3 (F) is preferably 400 mm 4 or less, more preferably 300 mm 4 or less.
  • the gripping portion 5 has a continuous region of at least 20% of the length in the longitudinal direction of the gripping portion 5 at any position and has a length in the thickness direction and a length in the width direction of 4.5 mm or more; It is preferably 0 mm or less, and the length in the thickness direction and the length in the width direction are both 4.5 mm or more and 8.0 mm in a continuous region of at least 50% of the length in the long axis direction of the grip part 5 The following are more preferable. If at least one of the length in the thickness direction and the length in the width direction is less than 4.5 mm, excessive bending occurs in the grip portion 5 .
  • the grip portion 5 When at least one of the length in the thickness direction and the length in the width direction exceeds 8.0 mm, the grip portion 5 is not sufficiently bent.
  • the length in the thickness direction and the length in the width direction are both 4.5 mm or more and 8.0 mm or less in an area of at least 20% of the length in the longitudinal direction of the gripping portion 5 at an arbitrary position. By doing so, it is possible to cause the grasping portion 5 to bend sufficiently but not excessively.
  • both the length in the width direction and the length in the thickness direction of the grip portion 5 at position C are preferably 4.5 mm or more and 8.0 mm or less.
  • Both the length in the width direction and the length in the thickness direction of the grip portion 5 at the position D are preferably 4.5 mm or more and 8.0 mm or less.
  • WD 3 (C) is preferably 410 mm 4 or more and 4000 mm 4 or less, more preferably 600 mm 4 or more and 1800 mm 4 or less.
  • the lower limit of WD 3 (C) is preferably 410 mm 4 or more, more preferably 600 mm 4 or more.
  • the upper limit of WD 3 (C) is preferably 4000 mm 4 or less, more preferably 1800 mm 4 or less.
  • the values represented by WD 3 (C) and WD 3 (D) correspond to the geometrical moment of inertia at position C and position D when the grip portion 5 has a substantially rectangular cross section and a load is applied in the thickness direction. It indicates a value, and correlates with the easiness of bending of the grip portion 5 in the thickness direction.
  • the value represented by WD 3 (C)/WD 3 (D) is preferably 0.35 or more and 2.0 or less, more preferably 0.50 or more and 1.5 or less.
  • the lower limit of the value represented by WD 3 (C)/WD 3 (D) is preferably 0.35 or more, more preferably 0.50 or more.
  • the upper limit of the value represented by WD 3 (C)/WD 3 (D) is preferably 2.0 or less, more preferably 1.5 or less.
  • WD 3 (D) is preferably 410 mm 4 or more and 4000 mm 4 or less, and 600 mm 4 or more and 2400 mm 4 or less. is more preferable.
  • the lower limit of WD 3 (D) is preferably 410 mm 4 or more, more preferably 600 mm 4 or more.
  • the upper limit of WD 3 (D) is preferably 4000 mm 4 or less, more preferably 2400 mm 4 or less.
  • the tip of the gripping portion 5 bends in the thickness direction, and the thickness of the gripping portion 5 as a whole increases. bending in the lateral direction cannot be realized.
  • the position D of the grip portion 5 is too thick to realize a thin grip portion 5 . If the value represented by WD 3 (C)/WD 3 (D) exceeds 2.0, the thin grip portion 5 cannot be realized.
  • the bending in the thickness direction at the tip of the gripping portion 5 becomes large, and the bending in the thickness direction of the entire gripping portion 5 cannot be realized.
  • the value represented by WD 3 (C)/WD 3 (D) to 0.35 or more and 2.0 or less, the bending of the entire grip portion 5 in the thickness direction and the thin grip portion 5 can be reduced. can be compatible.
  • DW 3 ( C) is preferably 410 mm 4 or more and 4000 mm 4 or less, more preferably 600 mm 4 or more and 1800 mm 4 or less.
  • the lower limit of DW 3 (C) is preferably 410 mm 4 or more, more preferably 600 mm 4 or more.
  • the upper limit of DW 3 (C) is preferably 4000 mm 4 or less, more preferably 1800 mm 4 or less.
  • the values represented by DW 3 (C) and DW 3 (D) are values corresponding to the geometrical moment of inertia at positions C and D when the cross section of the grip portion 5 is substantially rectangular and a load is applied in the width direction. , which correlates with the flexibility of the grip portion 5 in the width direction.
  • the value represented by DW 3 (C)/DW 3 (D) is preferably 0.35 or more and 2.0 or less, more preferably 0.50 or more and 1.5 or less.
  • the lower limit of the value represented by DW 3 (C)/DW 3 (D) is preferably 0.35 or more, more preferably 0.50 or more.
  • the upper limit of the value represented by DW 3 (C)/DW 3 (D) is preferably 2.0 or less, more preferably 1.5 or less.
  • DW 3 (D) is preferably 410 mm 4 or more and 4000 mm 4 or less, and is 600 mm 4 or more and 2400 mm 4 or less. is more preferable.
  • the lower limit of DW 3 (D) is preferably 410 mm 4 or more, more preferably 600 mm 4 or more.
  • the upper limit of DW 3 (D) is preferably 4000 mm 4 or less, more preferably 2400 mm 4 or less.
  • the bending in the width direction at the tip of the gripping portion 5 becomes large, and the bending in the width direction of the entire gripping portion 5 cannot be realized.
  • the value represented by DW 3 (C)/DW 3 (D) to 0.35 or more and 2.0 or less, the bending of the entire grip portion 5 in the width direction and the thin grip portion 5 can be reduced. can be made compatible.
  • the ratio of the width direction length of the gripping portion 5 at the position C to the width direction length of the gripping portion 5 at the position D is preferably 0.65 or more and 1.3 or less, more preferably 0.70 or more and 1 .2 or less is more preferable.
  • the lower limit of the above ratio is preferably 0.65 or more, more preferably 0.70 or more.
  • the upper limit of the above ratio is preferably 1.3 or less, more preferably 1.2 or less.
  • the ratio of the thickness direction length of the gripping portion 5 at the position C to the thickness direction length of the gripping portion 5 at the position D is preferably 0.65 or more and 1.30 or less, more preferably 0.70 or more. , 1.2 or less.
  • the ratio of the width direction length of the grip portion 5 at the position C to the width direction length of the grip portion 5 at the position D, or the ratio of the grip portion 5 at the position C to the thickness direction length of the grip portion 5 at the position D If the length ratio in the thickness direction is less than 0.65, the position C becomes narrower than the position D, and the stress concentrates on the position C, so that the gripping portion 5 as a whole cannot be bent. Alternatively, the shape of the position D becomes thicker than that of the position C, and the bending of the gripping portion 5 as a whole cannot be realized. On the other hand, when the ratio of lengths in the width direction or the length in the thickness direction exceeds 1.30, stress concentrates at position D, and bending at position C does not occur.
  • the shape of the position C is thicker than that of the position D, and the bending of the gripping portion 5 as a whole cannot be realized. Therefore, by setting the length ratio in the width direction and the length ratio in the thickness direction to 0.65 or more and 1.30 or less, the grip portion 5 becomes uniform, and when force is applied, Furthermore, the stress is dispersed in the gripping portion 5, and the entire gripping portion 5 can be bent.
  • the ratio of the widthwise length of the neck portion 4 at the position A to the widthwise length of the grip portion 5 at the position D is preferably 0.38 or more and 0.89 or less, and is preferably 0.41 or more and 0.41 or more. It is more preferably 0.54 or less.
  • the lower limit of the above ratio is preferably 0.38 or more, more preferably 0.41 or more.
  • the upper limit of the above ratio is preferably 0.89 or less, more preferably 0.54 or less.
  • the ratio of the thickness direction length of the neck portion 4 at the position A to the thickness direction length of the grip portion 5 at the position D is preferably 0.38 or more and 0.89 or less, and is preferably 0.54 or more. , 0.70 or less.
  • the lower limit of the above ratio is preferably 0.38 or more, more preferably 0.54 or more.
  • the upper limit of the above ratio is preferably 0.89 or less, more preferably 0.70 or less.
  • the value represented by WD 3 (A)/WD 3 (D) is preferably 0.10 or more and 0.20 or less.
  • the value represented by DW 3 (A)/DW 3 (D) is preferably 0.05 or more and 0.20 or less.
  • At least one of the length in the thickness direction and the length in the width direction of the neck portion 4 is the length in the thickness direction between the position C and the position D in the grip portion 5. Or it has a position greater than the length in the width direction.
  • the position E which is the most distal side, is located at the distal side of the position B by 3 mm or more.
  • the position E in this embodiment is positioned 4.0 mm further to the tip side than the position B.
  • the grip portion 5 is thinner than the rear end side of the neck portion 4, stress is likely to be generated on the grip portion 5 side, and bending of the grip portion 5 can be realized. Stress is likely to occur in the gripping portion 5 when the thicker region than the thickest portion in the region CD of the gripping portion 5 is positioned 3 mm or more toward the tip side of the position B.
  • De is the length in the thickness direction of the outline of the gripping region 5R including the soft portion 75 in a side view from the tip end of the gripping portion 5 to the rear end thereof, and FIG.
  • the value represented by Dh/De is a continuous length of at least 20% or more of the length of the grip portion 5 in the longitudinal direction. It is preferably 0.75 or less in a region, more preferably 0.75 or less in a continuous region of at least 50% or more of the length in the long axis direction of the grip portion 5, and 0.70 or less. is more preferred.
  • the maximum value of the length Dh of the continuous region is preferably 5.5 mm or more and 7.5 mm or less.
  • the value represented by Dh/De in the hard portion 60 is 0.75 or less, and the hard portion in the thickness direction of the gripping region 5R By reducing the ratio of 60, it becomes easy to generate a force that bends the grip part 5 in the thickness direction while ensuring a thickness that is easy to grip as the toothbrush 1.
  • the widthwise length of the outline of the gripping region 5R including the soft portion 75 in front view is We, and as shown in FIG. Assuming that the width is Wh, the value represented by Wh/We is preferably 0.75 or less in a continuous region of at least 20% or more of the length of the gripping portion 5 in the longitudinal direction. It is more preferably 0.75 or less, even more preferably 0.70 or less in a continuous region of at least 50% of the length in the longitudinal direction.
  • the maximum length Wh of the continuous region is preferably 5.5 mm or more and 7.5 mm or less.
  • the value represented by Wh/We in the hard portion 60 is 0.75 or less, and the hard portion 60 in the width direction of the gripping region 5R
  • the grip portion 5 is the starting point, and the distal end side of the grip portion 5 bends in a wide range of motion in the width direction and the thickness direction according to the direction in which the load is applied, and the head portion 3 can be sufficiently twisted in the direction of rotation about the axis extending in the longitudinal direction, so that the fit to the teeth to be cleaned and the cleaning of gaps can be improved regardless of how to brush and technique. .
  • toothbrush samples of Examples 1 to 8 and Comparative Examples 1 to 5 were produced according to the specifications shown in [Table 1] below. Each portion of the toothbrush in each example had the dimensions shown in Table 1.
  • PP resin was used as the hard resin of the brush body, and thermoplastic elastomer (TPE) was used as the soft resin.
  • TPE thermoplastic elastomer
  • An average score of 4.5 or more and 5.0 or less from the 10 expert panel is marked as " ⁇ (star mark; Special Good)", and an average score of 4.0 or more and less than 4.5 is marked as " ⁇ ( Double circle mark; Very Good)”, “O (circle mark; Good)” when the average score is 3.5 or more and less than 4.0 points, “ ⁇ (cross mark)” when the average score is less than 3.5 points; Bad”, ⁇ , ⁇ , or ⁇ in terms of fit to the teeth and gums of the toothbrush was judged to be a toothbrush that provides good fit to the teeth and gums during toothbrushing.
  • ⁇ Evaluation Criteria 5 points: "The fit to the teeth and gums" is very felt. 4 points: “Fitness to teeth and gums” is felt considerably. 3 points: “Fitness to teeth and gums” can be felt. 2 points: “Fitness to teeth and gums” is slightly felt. 1 point: Absolutely no “fitness to teeth and gums” is felt.
  • the thickness and width of the neck portion at position A are both 3.0 mm or more and 4.3 mm or less, and width (A)/(B) and thickness (A)/ (B) is 0.30 or more and 0.60 or less, the bending of the brush body in the width direction measured by the above method ( ⁇ ), and the thickness of the brush body measured by the above method ( ⁇ )
  • the samples of Examples 1 to 8 in which at least one of the bends in the vertical direction bends starting from the grip part, [fitness to teeth and gums in the scrub method], [fitness to teeth and gums in the Phones method] Good fit] and [fitness to teeth and gums in the rolling method/bath method] were both evaluated favorably.
  • the bending length when a load of 200 g is applied is 6.0 mm or more and 11.0 mm or less when the load is applied in the width direction and when the load is applied in the thickness direction.
  • the rotation angle of the head portion was 30° or more and 50° or less when a torque of 20 N ⁇ cm was applied.
  • the bending length when a load of 200 g is applied is 6.0 mm or more and 11.0 mm or less when a load is applied in the width direction, and the torque is 20 N cm.
  • the rotation angle of the head portion is 30° or more and 50° or less
  • [fitness to teeth and gums by the Phones method] and [fitness to teeth and gums by the rolling method/bath method] A particularly good evaluation was obtained in the section "Performance".
  • the bending length when a load of 200 g is applied is 6.0 mm or more and 11.0 mm or less when a load is applied in the thickness direction, and the torque is 20 N cm.
  • the rotation angle of the head part is 30 ° or more and 50 ° or less
  • [fitness to teeth and gums in the scrub method] and [fitness to teeth and gums in the rolling method/bath method] A particularly good evaluation was obtained in the fit property].
  • the thickness and width of the neck portion at position A are both 3.0 mm or more and 4.3 mm or less, the width (A)/(B) and thickness (A)/(B) The samples of Comparative Examples 1 and 2 outside the range of 0.30 or more and 0.60 or less did not give good evaluations in terms of [fitness to teeth and gums in the rolling method/bath method].
  • the thickness and width of the neck portion at position A are both 3.0 mm or more and 4.3 mm or less, the width (A)/(B) and thickness (A)/(B) are 0.30.
  • the grip portion of Comparative Example 5 does not bend from the range of 0.60 or less.
  • all of [fitness to teeth and gums in the scrub method], [fitness to teeth and gums in the Phones method], and [fitness to teeth and gums in the rolling method/bath method] It didn't get good reviews.
  • Comparative Example 3 in which the width of the neck portion at position A is out of the range of 3.0 mm or more and 4.3 mm or less, and the width (A)/(B) is out of the range of 0.30 or more and 0.60. sample did not give a good evaluation for [fitness to teeth and gums by the Phones method]. Comparative Example 4 in which the thickness of the neck portion at position A is out of the range of 3.0 mm or more and 4.3 mm or less, and the thickness (A)/(B) is out of the range of 0.30 or more and 0.60 or less. sample did not give a good evaluation for [fitness to teeth and gums by rolling method/bath method].
  • the present invention can be applied to toothbrushes.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Brushes (AREA)
PCT/JP2022/017784 2021-05-13 2022-04-14 歯ブラシ WO2022239598A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050108841A1 (en) * 2003-11-25 2005-05-26 Edwards Steven J. Flexible neck toothbrush
WO2016208333A1 (ja) * 2015-06-24 2016-12-29 ライオン株式会社 歯ブラシ
JP2019516448A (ja) * 2016-05-24 2019-06-20 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 歯ブラシにおける力の光学的検知のための方法及びシステム

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CN109890247B (zh) 2016-10-28 2021-11-26 狮王株式会社 牙刷

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050108841A1 (en) * 2003-11-25 2005-05-26 Edwards Steven J. Flexible neck toothbrush
WO2016208333A1 (ja) * 2015-06-24 2016-12-29 ライオン株式会社 歯ブラシ
JP2019516448A (ja) * 2016-05-24 2019-06-20 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 歯ブラシにおける力の光学的検知のための方法及びシステム

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