WO2020138280A1 - 歯ブラシ - Google Patents

歯ブラシ Download PDF

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Publication number
WO2020138280A1
WO2020138280A1 PCT/JP2019/051103 JP2019051103W WO2020138280A1 WO 2020138280 A1 WO2020138280 A1 WO 2020138280A1 JP 2019051103 W JP2019051103 W JP 2019051103W WO 2020138280 A1 WO2020138280 A1 WO 2020138280A1
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WO
WIPO (PCT)
Prior art keywords
displacement amount
repulsive force
threshold value
reversing
less
Prior art date
Application number
PCT/JP2019/051103
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
玲央奈 野田
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 CN201980084772.9A priority Critical patent/CN113194784B/zh
Priority to KR1020217015747A priority patent/KR20210104678A/ko
Priority to US17/312,384 priority patent/US20220015531A1/en
Priority to EP19905494.1A priority patent/EP3903632A4/en
Priority to JP2020562402A priority patent/JPWO2020138280A1/ja
Publication of WO2020138280A1 publication Critical patent/WO2020138280A1/ja

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0054—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use
    • A46B5/0066—Flexible resilience by elastic deformation of the material
    • 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
    • A46B5/021—Grips or handles specially adapted to conform to the hand
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B7/00—Bristle carriers arranged in the brush body
    • A46B7/06—Bristle carriers arranged in the brush body movably during use, i.e. the normal brushing action causing movement
    • 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 toothbrushes.
  • the present application claims priority based on Japanese Patent Application No. 2018-246150 filed in Japan on December 27, 2018, and the content thereof is incorporated herein.
  • Root caries is caries of dentin exposed due to gingival recession, but dentin has a higher proportion of organic components than enamel, so caries progress faster.
  • One of the causes of the above-mentioned gingival retraction is overbrushing in which brushing is performed with a brushing pressure larger than an appropriate value.
  • the brushing pressure is defined by the load/flocking area
  • the brushing pressure can be reduced by at least one of reducing the load and increasing the flocking area.
  • the neck part bends during brushing, and the toothbrush is designed to brush with the force of straightening the neck part during brushing.
  • toothbrushes that use a softer type, and toothbrushes that have a center of gravity of the gripping portion located closer to the rear end of the handle so that force is less likely to be applied to the flocked portion.
  • toothbrushes having a wide head width are commercially available. However, in these specifications, it is possible to reduce the brushing pressure, but it is difficult to make all users recognize the appropriate brushing pressure at the same level and control the brushing pressure.
  • the toothbrush disclosed in Patent Document 1 can be cited.
  • the toothbrush disclosed in Patent Document 1 is disposed between the head portion and the grip portion and has a two-beam structure of a rear beam to which compressive stress is applied during normal use and a face beam to which tensile stress is applied. There is.
  • the rear beam to which a compressive force exceeding the determined force is applied while the user is grasping the grasping portion elastically buckles and protrudes downward from the arc that is convex upward. Invert to a circular arc.
  • the user can recognize that the proper brushing pressure has been exceeded by reversing the rear beam.
  • the present invention has been made in consideration of the above points, and an object thereof is to provide a toothbrush capable of recognizing an appropriate brushing pressure with high versatility and a good feeling of use.
  • a head portion provided on the distal end 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 flocked surface and the grip portion. And a neck portion arranged between, and a sensing portion for sensing that the external force in the first direction orthogonal to the flocked surface exceeds a predetermined value on the rear end side of the flocked surface,
  • the sensing unit is a displacement amount of the head unit when a load is applied to the head unit in the first direction to a back surface side opposite to the flocked surface, and a repulsive force generated according to the displacement amount.
  • the repulsive force is changed from increasing to decreasing at the first threshold value in accordance with the increase of the displacement amount, and the second threshold value in which the displacement amount is larger than the first threshold value,
  • B/A Provided is a toothbrush characterized in that the value represented is 0.3 or more and 0.9 or less.
  • the repulsive force A is 1.0 N or more and 5.0 N or less.
  • a value represented by DC is Is 0 mm or more and 1.5 mm or less.
  • the displacement amount C is 28 mm or less.
  • the sensing unit when the displacement amount exceeds the second threshold value, the sensing unit increases the repulsive force according to an increase in the displacement amount.
  • an increase rate of the repulsive force until the displacement amount of the head portion becomes 4 mm from the displacement amount at the second threshold value is 0.015 or more. It is characterized by
  • the sensing unit applies a load to the back surface side, and after at least stopping the reduction of the repulsive force, when the load is released, The relationship between the displacement amount and the repulsive force maintains the same relationship as before the load is applied.
  • the sensing unit connects a first region on the tip side with respect to the sensing unit and a second region on the rear end side with respect to the sensing unit,
  • the reversal portion that flips and buckles with the displacement of the head portion to the back surface side opposite to the flocked surface in the first direction due to the external force exceeding the threshold value, and the reversal portion.
  • an elastic deformation portion that connects the first region and the second region and that elastically deforms at least up to the external force at which the reversal portion jumps and buckles to be reversed.
  • the portion is located between the outer contour on the flocking surface side and the outer contour on the back surface side in the elastically deformable portion in a side view viewed in a direction orthogonal to the long axis direction and the first direction.
  • a path in which the elastically deformable portion is deformed by an external force in the first direction and a path in which the reversal portion is deformed by an external force in the first direction are non-interfering with each other. It is provided.
  • the elastically deformable portion and the reversal portion are arranged with a gap in a second direction orthogonal to the first direction and the major axis direction, respectively. It is characterized by
  • the reversal portion has a convex shape on the back side when the external force in the first direction is equal to or less than the predetermined value, and the external force in the first direction is the predetermined value. When it exceeds the value, it is inverted to a convex shape on the flocked surface side.
  • the reversal portion has a groove portion extending in the second direction on at least one of the flocked surface side and the back surface side in a region including the apex of the convex shape, It is characterized by
  • the reversal portion is formed of a hard resin
  • a part of the elastically deformable portion is formed of a resin having a hardness different from that of the hard resin. Is characterized by.
  • the toothbrush according to the aspect of the present invention is characterized in that the gap is a through hole extending in the first direction.
  • the present invention can provide a toothbrush capable of recognizing an appropriate brushing pressure with high versatility and a good feeling of use.
  • FIG. 6 is a cross-sectional view of the sensing unit 70 taken along a plane parallel to the thickness direction and the width direction.
  • FIG. 5 is a cross-sectional view of the sensing unit 70 taken along a plane parallel to the thickness direction and the long axis direction. It is a partial front view of the sensing unit 70 periphery in the hard part 70H. It is a partial side view of the periphery of the sensing unit 70 in the hard portion 70H.
  • FIG. 7 is a cross-sectional view of the sensing unit 70 taken along a plane parallel to the thickness direction and the long axis direction, for explaining that the inverting unit is inverted. It is a figure which shows the relationship between the pushing amount (mm) measured by the autograph testing machine, and the bending repulsion force (N). It is a perspective view showing a sensing unit 70 of the toothbrush 1.
  • FIGS. 1 to 9 show one aspect of the present invention, and do not limit the present invention, and can be arbitrarily modified within the scope of the technical idea of the present invention.
  • the scale and the number of each structure are different from the actual structure in order to make each structure easy to understand.
  • the side orthogonal to the flocked surface in the side view is the vertical direction
  • the flocked surface side is the upper side
  • the back side opposite to the flocked surface is the lower side.
  • the up-down direction, the upper side, and the lower side are merely names used for description, and do not limit the actual positional relationship or direction in the present invention.
  • FIG. 1 is a front view of the toothbrush 1.
  • FIG. 2 is a cross-sectional view of the toothbrush 1 taken along a plane including the center in the width direction (vertical direction in FIG. 1).
  • the toothbrush 1 of the present embodiment has a head portion 10 arranged on the tip side (hereinafter, simply referred to as the tip side) in the long axis direction and having a tuft of bristles (not shown) implanted, and a head portion 10 having a long length.
  • a neck portion 20 extending to the rear end side in the axial direction hereinafter, simply referred to as a rear end side
  • a sensing portion 70 extending to the rear end side of the neck portion 20, and a rear end side of the sensing portion 70.
  • the extended grip portion 30 (hereinafter, the head portion 10, the neck portion 20, the grip portion 30, and the sensing portion 70 are collectively referred to as a handle body 2).
  • the toothbrush 1 of the present embodiment is a molded body in which a hard portion H made of a hard resin and a soft portion E made of a soft resin are integrally molded.
  • the hard portion H constitutes at least a part of each of the head portion 10, the neck portion 20, the grip portion 30, and the sensing portion 70.
  • the soft part E constitutes a part of each of the grip part 30 and the sensing part 70 (details will be described later).
  • the head portion 10 has a flocked surface 11 on one side in the thickness direction (direction orthogonal to the paper surface in FIG. 1).
  • the flocked surface 11 side in the thickness direction will be referred to as the front side in the front direction
  • the side opposite to the flocked surface will be referred to as the back side
  • the direction orthogonal to the thickness direction and the major axis direction will be the width direction (or appropriate).
  • Lateral direction Lateral direction).
  • a plurality of flocked holes 12 are formed on the flocked surface 11.
  • a tuft of hairs (not shown) is planted in the tufting hole 12.
  • the width of the head portion 10, that is, the length in the width direction parallel to the flocked surface 11 on the front side and orthogonal to the major axis direction (hereinafter, simply referred to as width) is not particularly limited and is, for example, 7 mm or more and 13 mm or less. Is preferred. If it is at least the above lower limit, a sufficient area for implanting hair bundles can be secured, and if it is at most the above upper limit, operability in the oral cavity can be further enhanced.
  • the length of the head portion 10 in the major axis direction (hereinafter, simply referred to as “length”) is not particularly limited, and is preferably 10 mm or more and 33 mm or less, for example.
  • length of the head portion 10 is equal to or more than the above lower limit value, a sufficient area for implanting the hair bundle can be secured, and when the length is equal to or less than the above upper limit value, operability in the oral cavity can be further enhanced.
  • the boundary between the neck portion 20 and the head portion 10 in the major axis direction in this embodiment is a position where the width of the neck portion 20 becomes the minimum value from the neck portion 20 toward the head portion 10.
  • the length of the head portion 10 in the thickness direction (hereinafter, simply referred to as thickness) can be determined in consideration of the material and the like, and is preferably 2.0 mm or more and 4.0 mm or less.
  • thickness can be determined in consideration of the material and the like, and is preferably 2.0 mm or more and 4.0 mm or less.
  • the strength of the head portion 10 can be further increased.
  • the thickness of the head portion 10 is equal to or less than the above upper limit value, the reachability to the back of the back teeth can be enhanced and the operability in the oral cavity can be further enhanced.
  • Hair bundle is a bundle of multiple hairs.
  • the length (hair length) from the flocked surface 11 to the tip of the hair bundle can be determined in consideration of the hair stiffness required for the hair bundle and is, for example, 6 to 13 mm. All tufts may have the same hair length or may differ from each other.
  • the thickness of the hair bundle (hair bundle diameter) can be determined in consideration of the hair stiffness required for the hair bundle, and is set to, for example, 1 to 3 mm. All the tufts may have the same tuft diameter or may be different from each other.
  • the bristle forming the tuft for example, the diameter thereof gradually decreases toward the bristle tip, and the bristle tip is sharpened (tapered bristle), and the diameter thereof from the flocked surface 11 to the bristle tip is almost the same.
  • the same hair (straight hair) and the like can be mentioned.
  • the straight bristles include a bristled tip that is a plane substantially parallel to the flocked surface 11, and a bristled tip that is rounded into a hemispherical shape.
  • the material for the hair is, for example, polyamide such as 6-12 nylon (6-12NY) or 6-10 nylon (6-10NY), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT). ), polyesters such as polyethylene naphthalate (PEN) and polybutylene naphthalate (PBN), polyolefins such as polypropylene (PP), elastomer resins such as polyolefin elastomers and styrene elastomers. These resin materials can be used alone or in combination of two or more.
  • the bristle include polyester bristle having a multi-core structure having a core and at least one or more sheaths provided outside the core.
  • the cross-sectional shape of the hair is not particularly limited, and may be a circle such as a true circle or an ellipse, a polygon, a star, a three-leaf clover shape, or a four-leaf clover shape.
  • the cross-sectional shapes of all the bristles may be the same or different.
  • the length of the neck portion 20 is preferably 40 mm or more and 70 mm or less.
  • the width of the neck portion 20 is formed so as to gradually increase from the position of the minimum value to the rear end side.
  • the neck portion 20 in the present embodiment is formed such that it gradually increases from the position where the width is the minimum value toward the rear end side. Further, the neck portion 20 is formed such that the thickness thereof gradually increases from the position where the thickness is minimum to the rear end side.
  • the width and thickness of the neck portion 20 at the minimum position are both preferably 3.0 mm or more and 4.5 mm or less. If the width and thickness of the neck portion 20 at the minimum position are equal to or more than the above lower limit values, the strength of the neck portion 20 can be further increased, and if the width and thickness are less than or equal to the above upper limit values, lips are easily closed and reachability to the back teeth is achieved. And the operability in the oral cavity can be further enhanced.
  • the width and thickness of the neck portion 20 formed so as to gradually increase from the position of the minimum value toward the rear end side can be appropriately determined in consideration of the material and the like.
  • the front side of the neck portion 20 as viewed from the side is inclined toward the front side as it goes toward the rear end side.
  • the back surface side of the neck portion 20 as viewed in the side direction is inclined toward the back surface side toward the rear end side.
  • the neck portion 20 is inclined such that the distance from the center in the width direction increases toward the rear end side.
  • the boundary between the neck portion 20 and the sensing portion 70 in this embodiment is the position of the tip of the neck side 20 where the elastic deformation portion 90 described later is provided.
  • the width increases from the neck portion 20 to the grip portion 30 in an arcuate contour in both front view and side view, and the position of the center of curvature of the arc coincides with the changed position in the long axis direction.
  • the boundary between the neck portion 20 and the sensing portion 70 is aligned with the position in the long axis direction where the center of curvature changes from the outside of the arc-shaped contour to the center side in the width direction. I am doing it.
  • the boundary between the neck portion 20 and the sensing portion 70 coincides with the position in the long axis direction in which the center of curvature changes from the outside of the arcuate contour to the center side in the thickness direction.
  • the grip portion 30 is arranged along the long axis direction. As shown in FIG. 1, the length of the grip portion 30 in the width direction gradually narrows from the boundary with the sensing portion 70 toward the rear end side, and then extends at a substantially constant length. As shown in FIG. 2, the length of the grip portion 30 in the thickness direction gradually narrows from the boundary with the sensing portion 70 toward the rear end side, and then extends at a substantially constant length.
  • the boundary between the sensing unit 70 and the grip unit 30 in this embodiment is the position of the tip of the grip unit side 30 where the elastically deformable unit 90 described below is provided.
  • the width decreases from the sensing unit 70 toward the grip unit side 30 in an arcuate contour in both front view and side view, and the position of the center of curvature of the arc coincides with the changed position in the long axis direction.
  • the boundary between the sensing unit 70 and the grip unit 30 is the position in the long axis direction where the center of curvature changes from the width direction center side to the outside of the arc-shaped contour.
  • the boundary between the sensing unit 70 and the gripping unit 30 coincides with the position in the long axis direction where the center of curvature changes from the center side in the thickness direction to the outside of the arc-shaped contour. ..
  • the width-direction length of the grip portion 30 gradually narrows from the boundary with the sensing portion 70 toward the rear end side, and then becomes a substantially constant length in the major axis direction and the thickness direction of the grip portion 30.
  • the position in the major axis direction where the length gradually narrows from the boundary with the sensing unit 70 toward the rear end side and then becomes substantially constant is the same.
  • the grip portion 30 has a soft portion 31E at the center in the width direction on the front side.
  • the soft part 31E constitutes a part of the soft part E.
  • the soft part 31E gradually narrows as it goes from the boundary with the sensing part 70 toward the rear end side in a front view, and then extends with a substantially constant length.
  • the side edge of the soft portion 31E and the side edge of the grip portion 30 on the outer side in the width direction are formed at a substantially constant distance.
  • the grip portion 30 has a hard portion 30H.
  • the hard portion 30H constitutes a part of the hard portion H.
  • the hard portion 30H has a recess 31H on the front side in which a part of the soft portion 31E is embedded.
  • the recess 31H gradually narrows as it goes from the boundary with the sensing unit 70 toward the rear end side in a front view, and then extends with a substantially constant length.
  • a part of the soft part 31E projects more than the hard part 30H exposed on the front side.
  • the other soft portion 31E is substantially flush with the hard portion 30H exposed on the front side.
  • the grip portion 30 has a soft portion 32E at the center in the width direction on the back side (see FIGS. 1 and 2).
  • the soft part 32E constitutes a part of the soft part E.
  • the soft portion 32E has an outer contour that is substantially the same as the outer contour of the soft portion 31E in a front view. That is, the soft portion 32E gradually narrows from the boundary with the sensing portion 70 toward the rear end side, and then extends with a substantially constant length. When viewed from the rear, the side edge of the soft portion 32E and the side edge of the grip portion 30 on the outer side in the width direction are formed at a substantially constant distance.
  • the hard part 30H has a recess 32H (see FIG. 2) in which a part of the soft part 32E is embedded on the back side.
  • the recess 32H gradually narrows as it goes from the boundary with the sensing unit 70 toward the rear end side in rear view, and then extends with a substantially constant length.
  • a part of the soft part 32E projects more than the hard part 30H exposed on the back side.
  • the other soft portion 32E is substantially flush with the hard portion 30H exposed on the front side.
  • the soft part 31E is provided on the front side of the grip part 30 and the soft part 32E is provided on the back side, grip performance when gripping the grip part 30 is improved.
  • the sensing unit 70 senses that the external force in the first direction orthogonal to the flocked surface 11 exceeds a predetermined value (hereinafter, external force threshold value).
  • the sensing unit 70 uses the relationship between the displacement amount of the head unit 10 when a load is applied to the back face side in the thickness direction of the head unit 10 and the repulsive force generated according to the displacement amount to increase the displacement amount. Accordingly, the repulsive force is changed from increasing to decreasing at the first threshold value, and the decreasing of the repulsive force is stopped at the second threshold value whose displacement amount is larger than the first threshold value (details will be described later).
  • the sensing unit 70 includes an inversion unit 80 and an elastic deformation unit 90 that connect the neck unit 20 on the front end side of the sensing unit 70 and the grip unit 30 on the rear end side of the sensing unit 70. doing.
  • FIG. 3 is a sectional view of the sensing unit 70 taken along a plane parallel to the thickness direction and the width direction.
  • FIG. 4 is a sectional view of the sensing unit 70 taken along a plane parallel to the thickness direction and the long axis direction.
  • the elastically deforming portions 90 are provided on both sides of the reversing portion 80 in the width direction with a gap S therebetween.
  • the gap S is formed by a through hole K penetrating in the thickness direction.
  • the through hole K is formed in a rectangular shape in plan view extending in the long axis direction.
  • the reversing unit 80 can be reversed (easy to reverse) without interfering with the surrounding structure. Further, since the deformation of the reversing portion 80 does not follow the deformation of the elastically deforming portion (since they do not interfere with each other), the functional roles (described later) of the reversing portion 80 and the elastically deforming portion 90 can be made independent. As a result, it is possible to increase the degree of freedom in design for obtaining the following effects, for example. For example, it is possible to clearly generate a vibration/sound when the reversing unit 80 described later is reversed.
  • the gap S is communicated with both sides in the thickness direction of the reversing portion 80 so as not to hinder the reversing behavior of the reversing portion 80, the above effect is further improved.
  • the vector of the load applied to the brush portion bridges
  • the direction in which the reversing portion 80 and the elastic deforming portion 90 are deformed become parallel ( (See FIG. 7), for example, it becomes easy to interlock the generation of vibration and sound due to reversal with the brushing load.
  • the movable region of the elastically deformable portion 90 having the bending function of the toothbrush skeleton with respect to the load during brushing can be further expanded. (Tensile behavior on the front surface and compression behavior on the back surface due to bending are not easily impeded).
  • the through hole K does not exist between the elastic deformation portion 90 and the reversal portion 80, the movable region of the elastic deformation portion 90 becomes narrow.
  • the inversion unit 80 may not be triggered to invert in an appropriate load range, and the inversion unit 80 may invert before reaching an appropriate load range, or may not invert even in an appropriate load range. is assumed.
  • the “external force threshold value” at which the reversing portion 80 described later is reversed can be controlled in a finer range. ..
  • the gap S does not have to penetrate in the thickness direction, and may be formed by, for example, a closed cavity extending in the long axis direction inside the elastically deformable portion 90. It may also be formed by a recess (described later) that opens to the front side or the back side.
  • Each elastically deformable portion 90 has a hard portion 90H and a soft portion 90E. As shown in FIG. 1, the hard portion 90H and the soft portion 90E connect the rear end of the neck portion 20 and the front end of the grip portion 30. As shown in FIGS. 3 and 4, between the pair of elastically deformable portions 90, a recess (recess) 71 opening to the front side and a recess (recess) 72 opening to the back side are provided. The bottoms of the recess 71 and the recess 72 on both widthwise end sides are connected to the through hole K, respectively. An inversion portion 80 is provided so as to be exposed at the bottom of the recess 71 and the recess 72 at the center in the width direction.
  • the movable region of the elastically deformable portion that performs the bending function of the toothbrush skeleton against the load during brushing can be further expanded, and the anisotropy of bending in the thickness direction can be improved.
  • the recess between the pair of elastically deformable portions 90 does not have to penetrate in the thickness direction, and may open in only one side in the thickness direction. Further, for example, a closed cavity extending in the long axis direction may be formed inside the elastically deformable portion 90, and a pair of elastically deformable portions may be formed in the width direction with the cavity being sandwiched in the center.
  • the ends in the long axis direction of the soft portion 90E are connected in the width direction on both the front side and the back side.
  • the soft portions 90E of the pair of elastically deformable portions 90 are provided around the oval recesses 71 and 72 in a front view.
  • the rear end side of the soft portion 90E is connected to the soft portion 31E of the grip portion 30.
  • the soft portions 90E are connected in the width direction on both the front end side and the rear end side of the elastically deformable portion 90, even if the reversal is repeated, stress is less likely to concentrate at the end of the reversal portion 80 and is less likely to break. Further, since the soft portion 90E is connected in the width direction, the amount of heat that the soft resin (elastomer) has during injection molding increases, and thus the adhesiveness between the neck portion 20 and the sensing portion 70 (neck portion 20 and the elastically deformable portion 90) is enhanced. ..
  • the anisotropy of the sensing unit 70 is increased by connecting the soft portions 90E in the width direction on both the front end side and the rear end side of the elastically deformable portion 90, and, for example, the pair of elastically deformable portions 90 can move during brushing. On the other hand, it becomes possible to bend without twisting in the thickness direction.
  • FIG. 5 is a partial front view around the hard portion 70H in the sensing unit 70.
  • FIG. 6 is a partial side view around the hard portion 70H of the sensing unit 70.
  • the hard portion 70H is formed in a rectangular shape in a plan view connecting the hard portion 20H that is the neck portion 20 and the hard portion 30H of the grip portion 30 in the major axis direction.
  • the front end side of the hard portion 70H is connected to the hard portion 20H by an arcuate curved surface 73H in a side view.
  • the front side rear end side of the hard portion 70H is connected to the hard portion 30H by an arcuate curved surface 74H in a side view.
  • the arc centers of the curved surfaces 73H and 74H are located on the front side of the hard portion 70H in a side view.
  • the rear end side of the hard portion 70H is connected to the hard portion 20H by an arcuate curved surface 75H in a side view.
  • the rear end side of the hard portion 70H on the back side is connected to the hard portion 30H by an arcuate curved surface 76H in a side view.
  • the arc centers of the curved surfaces 75H and 76H are located on the back side of the hard portion 70H in a side view.
  • the curved surfaces 73H to 76H do not exist, stress may be concentrated on the boundary between the front end side of the hard portion 70H and the hard portion 20H and the boundary between the rear end side of the hard portion 70H and the hard portion 30H.
  • the presence of the curved surfaces 73H to 76H alleviates the concentrated stress.
  • the presence of the curved surfaces 73H to 76H allows the elastically deformable portion 90 and both the front end side and the rear end side of the reversal portion 80 to be flexibly deformed (the elastically deformable portion 90 which triggers the reversal). The degree of deformation can be detected in more detail).
  • the hard portion 70H has through holes 73 provided on both sides of the reversing portion 80 in the width direction.
  • the through holes 73 extend in the long axis direction.
  • the length of the through-hole 73 in the major axis direction is such that the end of the through-hole 73 on the tip end side is separated from the hard part 20H and the end of the through-hole 73 on the rear end side is separated from the hard part 30H.
  • a soft portion 90E is provided near the hard portion 90H in the width direction, and a through hole K is formed near the inversion portion 80 in the width direction.
  • the hard portion 70H 90H are arranged on both sides in the width direction centering on the reversing portion 80 via the through holes 73, so that the shape of the reversing portion 80 even if the elastically deformable portion 90 is deformed under a load. Can be maintained.
  • the reversing part 80 of the sensing part 70 is reversed in order to release the accumulated strain energy.
  • the energy cannot be stored, so that the portion is immediately reversed.
  • the strain energy accumulated can be efficiently transferred to the reversing section. Can be communicated.
  • the hard portion 90H is formed outside the through hole 73 in the hard portion 70H in the width direction. As shown in FIG. 3, the hard portion 90H has a substantially rectangular cross-sectional shape.
  • the hard portion 90H is embedded in the soft portion 90E. Since the hard portion 90H is embedded in the soft portion 90E, the stress applied to the hard portion 90H can be relaxed from the viewpoint of strength. Further, in terms of the degree of bending of the toothbrush 1 with respect to the load, the elastic behavior of the elastically deformable portion 90 can be controlled. Further, the flexure anisotropy of the sensing unit 70 is enhanced, and the elastically deforming unit 90 can be flexed without being twisted in the thickness direction with respect to the movement during brushing, for example.
  • a resin having a flexural modulus (JIS7171) of 1500 MPa or more and 3500 MPa or less can be cited, and examples thereof include polyacetal resin (POM).
  • the flexural modulus of the hard portion H is more preferably 2000 MPa or more and 3500 MPa or less.
  • a shore hardness A of 90 or less is preferable, and a shore hardness A of 90 or less is preferable because the load when the jumping buckling occurs is close to the recommended brushing load value.
  • the soft resin include elastomers (for example, olefin-based elastomer, styrene-based elastomer, polyester-based elastomer, polyurethane-based thermoplastic elastomer, etc.) and silicone. Styrenic elastomers are preferred because of their excellent miscibility with polyacetal resins.
  • the inversion portion 80 extends in the major axis direction in a front view, and has a first region A1 on the tip side of the through hole 73 in the hard portion 70H and a second region on the rear end side of the through hole 73. It is connected to the area A2.
  • the reversing unit 80 does not apply an external force to the back side of the head unit 10 (or an external force equal to or less than a predetermined external force threshold value described later) is applied to the first stable state shown in FIG. (Referred to as “state”), it is formed in a substantially V shape in a side view, which gradually inclines toward the back side from both ends in the major axis direction toward the center. That is, in the first state, the reversal portion 80 is formed in a convex shape on the back side whose apex is the center in the long axis direction.
  • the sensing unit 70 when an external force is applied to the back side of the head unit 10 while holding the grip portion 30 and the magnitude of the external force is in a first state that is equal to or less than a predetermined external force threshold value, the sensing unit 70 The elastic deformation section 90 and the reversing section 80 elastically deform according to the magnitude of the external force.
  • the sensing unit 70 when an external force is applied to the back side of the head unit 10, the displacement amount of the head unit 10 according to the magnitude of the external force and the repulsive force (flexing repulsive force) generated according to the displacement amount. ), the repulsive force is changed from an increase to a decrease at the first threshold value in accordance with an increase in the displacement amount of the head portion 10, and the second displacement amount of the head portion 10 is larger than the first threshold value. At the threshold value, the reduction of repulsive force is stopped.
  • the elastic deformation section 90 determines that the external force value exceeds the external force threshold value. It elastically deforms.
  • the reversing unit 80 causes the neck portion to move as shown by a two-dot chain line in FIG. When the portion 20 is deformed, it jumps and buckles and is inverted, and becomes the second stable state (hereinafter referred to as the second state).
  • the reversing unit 80 is reversed in a direction in which it is gradually inclined toward the front side toward the center and has a substantially inverted V shape in a side view.
  • the reversing portion 80 is formed in a convex shape on the front side having the apex at the center in the long axis direction.
  • the elastic deformation portion 90 elastically deforms, and the bending strength of the sensing portion 70 is ensured. It jumps, buckles, and reverses to enter the second state. Further, since the through hole K is provided between the reversing portion 80 and the elastically deforming portion 90, the reversing portion 80 and the elastically deforming portion 90 can be deformed independently of each other, and the reversing portion 80 can be easily reversed. Become. That is, when the brushing load is applied, the through hole K is provided, so that the elastic member 90 is bent first and then the reversal portion 80 can be bent without interfering with each other's deformation behavior. It should be noted that the inversion portion 80 and the elastically deformable portion 90 do not necessarily have to penetrate therethrough, and the gap S may be formed.
  • the user who grips the gripping part 30 applies a back surface to the head part 10 due to the decrease in vibration and repulsive force when the inverting part 80 jumps and buckles and is inverted, and when the inverting part 80 shifts from the first state to the second state. It can be sensed that the external force applied to the side is in an overbrushing state in which the external force threshold value is exceeded.
  • the external force is applied to the head portion 10 and the increased displacement amount of the head portion 10 is larger than the first threshold value.
  • the repulsion force increases in a state where the reversal portion 80, in which the reduction of the repulsion force has stopped at the second threshold value, is formed in a convex shape on the front side in the second state.
  • the repulsive force increases in the state where the reversing portion 80 is formed in a convex shape on the front side in the second state, even if the external force applied to the head portion 10 decreases, the series of brushing pressure behaviors is quickly restored, It is possible to suppress the occurrence of operational problems. Therefore, the user who has gripped the grip portion 30 has a repulsive force in which the displacement amount of the head portion 10 exceeds the first threshold value and decreases, and thereafter, the displacement amount of the head portion 10 has the second threshold value.
  • the change in the repulsive force is detected in two stages, namely, the repulsive force whose reduction has stopped, and the overbrushing state can be more accurately detected.
  • the sensing unit 70 releases the load at least after stopping the reduction of the repulsive force, and then the displacement amount of the head unit 10 after the release. And the repulsive force maintain the same relationship as before loading.
  • B/A The value represented by is preferably 0.3 or more and 0.9, and more preferably 0.65 or more and 0.85 or less.
  • B/A the repulsive force A is greatly attenuated to the repulsive force B, which may impair the usability.
  • the displacement amount of the head unit 10 exceeds the second threshold value and increases, the repulsive force increases greatly, which may impair the feeling of use.
  • the repulsive force A is preferably 1.0 N or more and 5.0 N or less, more preferably 1.5 N or more and 4.0 N or less, and 1.5 N or more and 3.0 N or less. More preferable. If the repulsive force A is less than 1.0 N, sufficient cleaning force may not be obtained. If the repulsive force A exceeds 5.0 N (about 500 g), there is a possibility of causing harm to the gingiva. Therefore, by setting the repulsive force A to 1.0 N or more and 5.0 N or less, a sufficient cleaning force can be secured and harm to the gums can be suppressed. Further, the value of the repulsive force A is set to a value that does not exceed the recommended brushing pressure, which will be described later, within the above preferable range.
  • the value represented by DC is 0 mm or more and 1.5 mm or less. Is preferably 0 mm or more and 1.0 mm or less, more preferably 0 mm or more and 0.5 mm or less.
  • the value represented by DC exceeds 1.5 mm, the displacement of the head unit 10 exceeds the first threshold value and the repulsive force decreases, and then the displacement of the head unit 10 becomes the second displacement. The amount of displacement until the repulsive force increases beyond the threshold value increases, and the synergistic effect of recognizing the change in repulsive force in two steps may be diminished.
  • the displacement amount C of the first threshold value is preferably 28 mm or less. When the displacement amount C exceeds 28 mm, the amount of bending during brushing becomes large, which makes it difficult for the user to clean the oral cavity. Therefore, by setting the displacement amount C to 28 mm or less, the role of cleaning the oral cavity can be secured.
  • the displacement amount C of the first threshold value is more preferably 24 mm or less.
  • the lower limit value of the displacement amount C is more preferably 10 mm or more. By setting the lower limit of the displacement amount C to 10 mm or more, the brushing load applied to the gingiva can be relieved.
  • the repulsive force up to the displacement amount C rises in proportion to the displacement amount, and in particular, even if the repulsive force approaches the displacement amount C, the proportional relation does not change (the degree of increase in the repulsive force does not decrease).
  • the increase rate of the repulsive force per 1 mm of displacement until reaching the displacement C is preferably 0.05 or more, more preferably 0.08 or more, and further preferably 0.09 or more.
  • the rate of increase in repulsive force until the displacement amount of the head unit 10 reaches 4 mm, starting from the displacement amount D of the second threshold value, is preferably 0.015 or more.
  • the increasing rate of the repulsive force from the displacement amount D of the second threshold value to the displacement amount of the head unit 10 being 4 mm is less than 0.015, the repulsive force increase after the reversing unit 80 is reversed is small, Feeling may be impaired. Therefore, by setting the increase rate of the repulsive force from the displacement amount D of the second threshold value until the displacement amount of the head unit 10 becomes 4 mm to 0.015 or more, the usability after the reversal unit 80 is reversed. It is possible to continue brushing without damage.
  • the reversing part 80 has a groove part 81 in the center in the major axis direction on the front side, that is, in a region including a convex vertex.
  • the reversal portion 80 has a groove portion 82 in the center in the major axis direction on the back surface side, that is, in a region including a convex vertex.
  • the groove portions 81 and 82 extend in the width direction.
  • the groove portion 81 is formed in an arc shape in a side view in which the center of the arc is arranged on the front side.
  • the groove portion 82 is formed in an arc shape in a side view in which the center of the arc is arranged on the back side.
  • the reversal portion 80 is not provided with the groove portions 81 and 82, stress is uniformly generated in the entire reversal portion 80, and jump buckling hardly occurs.
  • the grooves 81 and 82 are provided in the reversal portion 80, stress is intensively generated in the groove portions 81 and 82, and the jumping buckling is likely to occur.
  • the radius of the arcuate groove portions 81, 82 in a side view is preferably 1 mm or more and 2 mm or less.
  • the reversing part 80 may not be reversed.
  • the radii of the grooves 81 and 82 exceed 2 mm, vibration at the time of reversing of the reversing unit 80 becomes small, and it may be difficult to detect that it is in the overbrushing state.
  • the groove portion 81 is deeper than the groove portion 82.
  • the reversing portion 80 is difficult to reverse even when the magnitude of the external force exceeds a predetermined external force threshold value.
  • the groove portion 81 is deeper than the groove portion 82, it becomes possible to guide the reversal portion 80 so that it is more likely to jump and buckle more toward the front side.
  • the groove portion 82 may not be provided and only the groove portion 81 may be provided.
  • the inversion part 80 is provided with the grooves 81 and 82 in the region including the convex vertex, the region including the convex vertex is thinner than the other regions. Therefore, the strain energy accumulated by the deformation of the reversing portion 80 due to the external force exceeding the external force threshold value can be instantly released from the groove portions 81 and 82 as the starting points, and the reversing portion 80 can be reversed. Further, it is possible to adjust the position of the reversing portion 80 from the first state to the second state by adjusting the positions of the grooves 81 and 82 in the thickness direction.
  • the groove portions 81 and 82 are formed in an arc shape in a side view, for example, as compared with the case where the groove portions 81 and 82 are formed in a V shape on two intersecting planes, the reversing portion 80 including the groove portions 81 and 82 is formed. Even when the apex moves in the thickness direction, stress concentration at the apex can be relaxed.
  • the external force threshold value of the external force applied to the head portion 10 to the back side is, for example, the upper limit value of an appropriate brushing pressure. This external force threshold value corresponds to the first threshold value in the displacement amount of the head unit 10 described above.
  • the angle ⁇ at which the reversal portion 80 is inclined with respect to the plane parallel to the long axis direction and the width direction is preferably 5 degrees or more and 11 degrees or less, and 7 degrees or more and 11 degrees or less. It is more preferable that the degree is less than or equal to the degree.
  • the inclination angle ⁇ is less than 5 degrees, it may be difficult to detect that the reversal portion 80 is in the overbrushing state because the reversal portion 80 is deformed without jumping and buckling. If the inclination angle ⁇ exceeds 11 degrees, it becomes difficult for the reversing portion 80 to buckle and buckle due to overbrushing pressure, or the reversing portion 80 may buckle and buckle when flipping over. It may break and lose reversibility.
  • the thickness of the reversal portion 80 is preferably 1 mm or more and 2 mm or less, excluding the groove portions 81 and 82. If the thickness of the reversing portion 80 is less than 1 mm, it may be deformed but not buckled, and it may be difficult to detect that it is in an overbrushing state. If the thickness of the reversing portion 80 exceeds 2 mm, it becomes difficult to reverse and flip the reversing portion 80 due to overbrushing pressure, or the reversing portion 80 breaks when reversing due to the popping buckling. There is a possibility that the reversibility is lost.
  • the maximum thickness of the reversing portion 80 is T (mm) and the maximum thickness of the sensing portion 70 is t (mm)
  • an excessive brushing load is applied by defining the value represented by T/t.
  • the value represented by T/t is preferably 0.05 or more and 0.35 or less, and more preferably 0.10 or more and 0.35 or less. If the value represented by T/t is less than 0.05, the reversing portion 80 is also deformed in a manner to follow the bending of the sensing portion 70 (elastic deformation portion 90), but it does not jump and buckle, resulting in overbrushing.
  • T/t It can be difficult to detect a condition. If the value represented by T/t exceeds 0.35, it becomes difficult for the reversing portion 80 to buckle and buckle due to overbrushing pressure, or it breaks when it flips due to jumping buckling. Then, the reversal of the reversing unit 80 may be lost.
  • the bending strength of the reversing portion 80 becomes flexible with respect to the elastically deforming portion 90 at a constant rate, and delays with respect to the bending of the elastically deforming portion 90 that bears the handle skeleton. It becomes possible to actuate the reversing unit 80. This makes it possible to control the easiness of reversing of the reversing unit 80 and the timing (external force threshold value) that triggers reversing of the reversing unit 80 even when an excessive brushing load is applied.
  • the maximum width of the reversing unit 80 is L (mm) and the maximum width of the sensing unit 70 is W (mm)
  • L/W a value represented by L/W
  • the value represented by L/W is preferably 0.05 or more and 0.35 or less, and more preferably 0.10 or more and 0.35 or less.
  • the reversing portion 80 is also deformed in a manner that follows the bending of the sensing portion 70 (elastic deformation portion 90), but is less likely to jump and buckle, resulting in an overbrushing state. Can be difficult to detect.
  • the value represented by L/W exceeds 0.35, the reversing portion 80 is less likely to be deformed and reversed due to the bending of the handle body 2 that occurs in the normal brushing range. Therefore, there is a possibility that it becomes difficult for the reversing portion 80 to jump and buckle due to the overbrushing pressure, or that the reversing portion 80 breaks when flipping and buckling and loses reversibility. ..
  • the bending strength of the reversing portion 80 becomes flexible with respect to the elastically deforming portion 90 at a constant rate, and delays with respect to the bending of the elastically deforming portion 90 that bears the handle skeleton. It becomes possible to actuate the reversing unit 80. Therefore, even when an excessive brushing load is applied, it is possible to control the ease of reversal of the reversing unit 80 and the timing (external force threshold value) that triggers reversing of the reversing unit 80.
  • the length of the reversing portion 80 in the major axis direction is preferably 15 mm or more and 30 mm or less, more preferably 15 mm or more and 25 mm or less, and further preferably 15 mm or more and 20 mm or less.
  • the position of the tip side end of the reversal portion 80 is the position of the tip side end of the through hole 73.
  • the position of the rear end side end portion of the reversal portion 80 is the position of the rear end side end portion of the through hole 73.
  • Deformation may not be possible.
  • the length of the reversing portion 80 in the major axis direction exceeds 30 mm, the displacement required until the buckling of the flipping becomes very large, so that the usability is greatly reduced and the deformation behavior of the reversing portion 80 is elastically deformed.
  • the behavior may be the same as that of the part 90.
  • the inverting section 80 is located between the outer contour of the flocking surface side 11 and the outer contour of the back surface side of the elastically deforming section 90 in a side view. More specifically, as the position of the reversing part 80 in the thickness direction, by setting the reversing part 80 so as not to form the outermost contour of the toothbrush, a position that does not protrude from the thickness of the elastically deforming part 90 in a side view, For example, it is possible to prevent the reversing unit from contacting the user during use. Specifically, it is preferable that the elastically deformable portion 90 is located on the back side of the position where the thickness is half.
  • the vertex of the reversing unit 80 When the position of the reversing unit 80 in the thickness direction is on the back side of the position where the thickness of the sensing unit 70 is half, when the reversing unit 80 is reversed and enters the second state, the vertex of the reversing unit 80. It is possible to reduce the possibility that the bulge protrudes from the front surface of the elastically deformable portion 90 and comes into contact with the user's finger. In addition, by disposing the reversing portion 80 on the back side of the position where the thickness of the elastically deformable portion 90 is half, the back side is compressed rather than the front side when the reversing portion 80 is bent. The energy that triggers the inversion is easily accumulated, and the strain energy can be efficiently transferred to the inversion unit 80.
  • the reversing portion 80 that constitutes a part of the hard portion H can detect that it is in a state of overbrushing due to a jumping buckling. Further, by setting the bending elastic modulus of the reversing portion 80 to 3500 MPa or less, it is possible to prevent the reversibility of the reversing portion 80 from being lost due to breakage when buckling due to jumping. Further, by using a material having a specified flexural modulus, vibrations due to the jumping buckling are intensively generated in a short time to be sharp (large). As a result, it becomes easier for the user to detect the overbrushing.
  • the moving distance in the thickness direction of the apex of the convex shape when the reversing portion 80 jumps and buckles is preferably 0.2 mm or more and 5.0 mm or less.
  • the vibration when jumping and buckling becomes small, and it may be difficult to detect that it is in the overbrushing state.
  • the moving distance in the thickness direction of the apex exceeds 5.0 mm, it becomes difficult for the reversing part 80 to snap and buckle due to overbrushing pressure, or when the reversing part 80 snaps to buckle and reverses. There is a possibility of breaking and losing the reversibility of the reversal section 80. If the moving distance of the reversing portion 80 is within the above range when jumping buckling occurs, vibration generated by jumping buckling is concentrated in a short time and becomes sharp (large). As a result, the user can easily detect the overbrushing.
  • the thickness of the hard portion 90H in the elastically deformable portion 90 is 2.0 mm or less, and the width is preferably larger than the thickness.
  • the thickness of the hard portion 90H is 2.0 mm or less, the hard portion 90H is less likely to generate internal stress because it is in a plane stress state. As a result, even if it is deformed, it is less likely to be broken, and it is possible to sufficiently store the energy required for reversing the reversing unit 80.
  • the reversal portion 80 and the elastic deformation portion 90 are arranged with a gap in the width direction, it is easier to deform the sensing portion 70 to the front side and the back side, and It is possible to obtain a plane stress state that is hardly deformed in the axial direction and the width direction. That is, in the toothbrush 1 of the present embodiment, the direction in which the reversal portion 80 and the elastically deformable portion 90 are deformed is the thickness direction that is separated from each other in the width direction and does not exist on the same plane.
  • the path through which the elastically deformable portion 90 is deformed by an external force in the thickness direction and the path through which the reversal portion 80 is deformed by an external force in the thickness direction are provided without interference. Therefore, in the toothbrush 1 of the present embodiment, the elastically deformable portion 90 and the reversing portion 80 are less likely to be restricted by each other and can be deformed, so that the energy required for reversing the reversing portion 80 can be accumulated more sufficiently. The stress is intensively generated in the reversal portion 80 (particularly the groove portions 81 and 82), and a sharp jumping buckling appears.
  • the bending in the thickness direction due to the brushing can be transmitted to the reversing unit 80 without loss.
  • the reversing portion 80 and the elastically deforming portion 90 are arranged in the width direction, the bending of the elastically deforming portion 90 and the reversing of the reversing portion 80 can be made independent and the timing can be shifted. If the elastically deformable portion 90 and the reversing portion 80 are arranged in the thickness direction, the roles of the elastically deforming portion 90 and the reversing portion 80 may be impaired.
  • the displacement amount of the head portion 10 when a load is applied to the head portion 10 on the back side in the thickness direction and the repulsive force generated according to the displacement amount.
  • the displacement amount is less than or equal to the first threshold value
  • the repulsive force is increased according to the increase in the displacement amount
  • the displacement amount is less than or equal to the second threshold value greater than the first threshold value
  • the displacement amount is Is provided with a sensing unit 70 that reduces the repulsive force according to an increase in the repulsive force, and the value represented by B/A is 0.3 or more and 0.9 or less, so that the repulsion is highly versatile and has a good feeling of use. It is possible to fully recognize the force and detect the overbrushing state.
  • sensing unit 70 In the above embodiment, the configuration in which the sensing unit 70 has the elastically deforming unit 90 and the reversing unit 80 is illustrated, but the present invention is not limited to this configuration, and for example, the function of elastically deforming by an external force in the thickness direction and the jumping. It may be configured to have the function of buckling.
  • FIG. 9A is a front view showing a modified example of the sensing unit 70.
  • FIG. 9B is a side view showing a modified example of the sensing unit 70.
  • FIG. 9C is a right side view of FIG. 9A. 9(a) to 9(c), the neck portion 20 and the grip portion 30 are not shown.
  • the sensing unit 70 of the modified example is formed in a rectangular shape in a front view as shown in FIG.
  • the sensing unit 70 has a recess 70a that opens to the front side.
  • the sensing unit 70 has an arcuate curved surface 70b that is convex on the back side in a side view.
  • the center of curvature of the curved surface 70b When viewed from the side, the center of curvature of the curved surface 70b is located further to the front side in the thickness direction than the long-axis direction end portion of the curved surface 70b.
  • the center of curvature of the curved surface 70b is located in the center of the sensing unit 70 in the long axis direction in a side view.
  • the crossing angle (small crossing angle) between the tangent to the curved surface 70b and the straight line parallel to the major axis direction in a side view is 0° (that is, parallel) at the center in the major axis direction.
  • the angle of intersection between the tangent to the curved surface 70b and the straight line parallel to the major axis direction in the side view gradually increases from the center in the major axis direction toward the end.
  • the center of curvature of the curved surface 70b is located closer to the front side in the thickness direction than the long-axis direction end of the curved surface 70b in a side view, a tangent to the curved surface 70b and a straight line parallel to the long axis direction in a side view.
  • the intersecting angle of is an acute angle or 0°.
  • the bottom surface of the recess 70a in a side view is a curved surface 70b and a curved surface 70d arranged on the front side with a constant width.
  • the sensing unit 70 has an arcuate curved surface 70c that is convex on the back side in right side view.
  • the center of curvature of the curved surface 70c is located closer to the front side in the thickness direction than the widthwise end of the curved surface 70c when viewed from the right side.
  • the center of curvature of the curved surface 70c is located at the center of the sensing unit 70 in the width direction when viewed from the right side.
  • the crossing angle (small crossing angle) between the tangent to the curved surface 70c and the straight line parallel to the width direction in the right side view is 0° (that is, parallel) at the center in the width direction.
  • the angle of intersection between the tangent to the curved surface 70c and the straight line parallel to the width direction in the right side view gradually increases from the center in the width direction toward the end. Since the center of curvature of the curved surface 70c is located closer to the front side in the thickness direction than the width direction end of the curved surface 70c in the right side view, a tangent line of the curved surface 70c and a straight line parallel to the width direction in the right side view.
  • the intersecting angle of is an acute angle or 0°.
  • the bottom surface of the recess 70a in the right side view is the curved surface 70c and the curved surface 70e disposed on the front side with a constant width.
  • the material of the sensing unit 70 of the modification the above-mentioned hard resin, soft resin, metal or the like can be used.
  • the length and width in the long axis direction are not limited, but the maximum thickness is 5 mm or less.
  • the sensing unit 70 when an external force is transmitted through the neck unit 20 and is deformed to the back side, a curved surface 70b that is convex toward the back side in side view and a curved surface that is convex toward the back side in right side view. Since it has 70c and has a large bending strength toward the back side in the thickness direction, it is elastically deformed as an elastically deformable portion with an external force equal to or less than the external force threshold value. On the other hand, since the sensing unit 70 has a maximum thickness of 5 mm or less and is thin, when an external force exceeding the external force threshold is transmitted, the sensing unit 70 jumps and buckles as an inversion unit and is inverted to a convex arc shape on the front side. As described above, the sensing unit 70 according to the modified example can have both the function of elastically deforming by the external force in the thickness direction and the function of jumping and buckling without separately providing the elastically deforming unit and the reversing unit. ..
  • Example 4 is a sample of a toothbrush which does not have a soft part of a sensing part in comparison with the sample of Example 1.
  • Example 6 is different from the sample of Example 1 in that it does not have an inversion part, the base end is located in the second region on the rear end side of the sensing part, and the first region on the tip side of the sensing part.
  • Example 7 is a toothbrush sample in which the radii of the groove portions 81 and 82 of the reversal portion are changed from 1.5 mm to 2 mm with respect to the sample of Example 1.
  • Example 9 is a sample of a toothbrush having a modification of the sensing unit shown in FIG. 9 with respect to the sample of Example 1.
  • Comparative Example 1 “Tekiatsu-kun” manufactured by Wada Precision Dental Laboratory Co., Ltd. was used as a sample.
  • Comparative Example 3 a toothbrush in which the gap S was filled with a soft resin was used as a sample with respect to the sample of Example 1.
  • the flocked portions of the samples other than Comparative Example 1 had the same specifications as the Clinica Advantage toothbrush manufactured by Lion Corporation.
  • the finger tip portion of the toothbrush which is closest to the tip of the gripping portion is chucked, and the center of the flocked surface of the head portion in the front view is pushed by the pressing element at a test speed of 100 mm/min to invert the reversing portion
  • the amount of pushing (the amount of displacement of the head) and the load (repulsive force) were measured. The test was performed three times for each sample, and the average value was used.
  • ⁇ Awareness of vibration An evaluation axis for whether or not the user notices the vibration of the sensing unit that occurs when the repulsive force A decays to the repulsive force B.
  • the vibration referred to here is a short-time and sharp (sharp, large) vibration that occurs due to jumping buckling. This vibration is very difficult to understand (1 point), very difficult to understand (2 points), rather difficult to understand (3 points), neither (4 points), rather easy to understand (5 points), very easy to understand ( 6 points) and a very easy to understand (7 points) rating.
  • FIG. 8 is a diagram showing the relationship between the pushing amount (mm) and the bending repulsion force (N) in the samples of Example 1, Example 4, Example 6, and Comparative Example 1 measured by the autograph tester. .. [Table 1] also shows that in the samples of Examples 1 to 9 and Comparative Examples 1 to 4, the repulsive force A(N) at the pushing amount of the first threshold and the repulsion at the pushing amount of the second threshold.
  • Force B (N) first threshold pushing amount (displacement amount) C (mm), second threshold pushing amount (displacement amount) D (mm), B/A, DC (mm) It is shown.
  • the repulsive force in which the displacement amount of the head portion 10 exceeds the first threshold value is reduced and the displacement amount of the head portion 10 is the second amount without impairing the feeling of use.
  • the threshold value of 1 the stop of the reduction of the repulsive force can be sufficiently recognized and the overbrushing state can be detected.
  • the value of the repulsive force A is in the range of 1.0 N or more and 5.0 N or less, and in the sample of Comparative Example 3, the value of the repulsive force A is 1.0 N or more, It was confirmed that it was out of the range of 5.0 N or less.
  • the value of the repulsive force A becomes large, the harmfulness to the gingiva becomes large.
  • the value of the repulsive force A becomes small, irritation to the gingiva disappears, but the plaque removing power decreases.
  • the evaluation of the harm to the gums failed.
  • the toothbrushes according to Examples 1 to 9 can exhibit sufficient plaque removal power while suppressing irritation to the gingiva.
  • the value of DC was in the range of 0 mm or more and 1.5 mm or less, and in the samples of Comparative Examples 1 and 4, the value of DC was 0 mm or more, 1. It was confirmed that it was out of the range of 5 mm or less.
  • the smaller the value of D-C the greater the inclination of the reduction of the repulsive forces A and B, so that it becomes easier to feel the vibration.
  • toothbrushes according to Examples 1 to 9 can secure good operability in the mouth until vibration occurs.
  • the configuration in which the sensing unit 70 is provided between the neck unit 20 and the grip unit 30 has been illustrated, but the configuration is not limited to this.
  • the sensing unit 70 may have a configuration provided on the neck unit 20 or a configuration provided on the grip unit 30.
  • the configuration in which one inversion unit 80 is provided in the sensing unit 70 is illustrated, but the configuration is not limited to this configuration, and a configuration in which a plurality of inversion units 80 are provided may be used.
  • the two reversing portions 80 are provided, one of them is formed to have a thickness and an inclination angle ⁇ that are inverted at an upper limit of an appropriate brushing load, and the other is formed to have a thickness and an inclination that are inverted at an appropriate lower limit of a brushing load.
  • the angle ⁇ or the like it becomes possible to easily define both the upper limit value and the lower limit value of the brushing load.
  • the configuration in which the reversal portion 80 is inverted in the thickness direction is illustrated, but the configuration is not limited to this, and for example, the width direction and the direction orthogonal to the major axis direction and the width direction and the thickness direction may be used.
  • the structure may be reversed in the diagonal direction intersecting.
  • the present invention can be applied to toothbrushes.

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PCT/JP2019/051103 2018-12-27 2019-12-26 歯ブラシ WO2020138280A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201980084772.9A CN113194784B (zh) 2018-12-27 2019-12-26 牙刷
KR1020217015747A KR20210104678A (ko) 2018-12-27 2019-12-26 칫솔
US17/312,384 US20220015531A1 (en) 2018-12-27 2019-12-26 Toothbrush
EP19905494.1A EP3903632A4 (en) 2018-12-27 2019-12-26 TOOTHBRUSH
JP2020562402A JPWO2020138280A1 (ja) 2018-12-27 2019-12-26 歯ブラシ

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US20220015531A1 (en) 2022-01-20
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