TW202106201A - toothbrush - Google Patents

toothbrush Download PDF

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Publication number
TW202106201A
TW202106201A TW109121347A TW109121347A TW202106201A TW 202106201 A TW202106201 A TW 202106201A TW 109121347 A TW109121347 A TW 109121347A TW 109121347 A TW109121347 A TW 109121347A TW 202106201 A TW202106201 A TW 202106201A
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TW
Taiwan
Prior art keywords
deformed
hard
long axis
axis direction
toothbrush
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TW109121347A
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Chinese (zh)
Inventor
川崎静香
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日商獅子股份有限公司
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Publication of TW202106201A publication Critical patent/TW202106201A/en

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    • 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
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • A46B5/0029—Head made of soft plastics, rubber or rubber inserts in plastics matrix
    • 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
    • A46B5/00—Brush bodies; Handles integral with brushware
    • 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
    • A46B5/0025—Brushes with elastically deformable heads that change shape during use
    • 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
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/06—Brush bodies; Handles integral with brushware in the form of tapes, chains, flexible shafts, springs, mats 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

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  • Brushes (AREA)

Abstract

The purpose of the present invention is to provide a toothbrush having good operability whereby it is possible to thoroughly brush a target site while maintaining an appropriate brushing pressure. This toothbrush comprises: a deformable section (70) that is arranged on a grip section (30) and that is deformed by external force acting in a first direction orthogonal to a bristle implantation surface (11); and a first area and a second area not deformed by external force. The deformable section comprises a hard section (H) formed from a hard resin connecting the first area and the second area and a flexible section (E) formed from a flexible resin and covering at least part of the hard section. The proportion occupied by the cross-sectional area of the hard section with respect to the cross-sectional area of the outer contour of the deformable section or of a closed space surrounded by the extended lines of the outer contour is 35% or less along the long axis direction, the bending strength of the deformable section in the first direction is limited so as to be less than the bending strength in a second direction orthogonal to the long axis direction and the first direction, the flexible section has a recess/protrusion structure (101) in which recesses and protrusions extending in a direction intersecting the long axis direction are adjacent to each other, and the recess/protrusion structure is exposed on each of the bristle implantation surface side and the back surface side in the first direction.

Description

牙刷toothbrush

本發明是有關於一種牙刷。 本申請案基於2019年6月28日於日本提出申請的日本專利特願2019-121254號而主張優先權，且將其內容引用於此。The present invention relates to a toothbrush. This application claims priority based on Japanese Patent Application No. 2019-121254 filed in Japan on June 28, 2019, and the content is incorporated herein.

80歲時具有20顆牙齒的人的比例大約5成，但另一方面，高齡者蛀牙（根面蛀牙）的比例正在增加。根面蛀牙是由於牙齦萎縮而露出的象牙質的蛀牙，但因為象牙質中有機成分的結構比率高於琺瑯質，因此蛀牙的進展快。作為所述牙齦萎縮的原因的其中一個，可列舉過度刷牙，所述過度刷牙是以大於適當值的刷牙壓力（tooth brushing pressure）刷牙。The proportion of people with 20 teeth at the age of 80 is about 50%, but on the other hand, the proportion of elderly people with tooth decay (root surface tooth decay) is increasing. Root cavities are dentinous cavities exposed due to atrophy of the gums. However, because the structure ratio of organic components in dentin is higher than that of enamel, tooth decay progresses quickly. One of the causes of the receding gums is excessive brushing, which is brushing with a tooth brushing pressure greater than an appropriate value.

過去，作為用於減少過剩的刷牙壓力的牙刷，已揭示有例如專利文獻1中所記載的牙刷。專利文獻1中所記載的牙刷，當握於掌柄部（palm grip）並刷牙時，手柄部的由拇指與食指握住的部分中，由熱塑性樹脂所形成的部分形成為向植毛面側開口的U字狀，而由熱塑性樹脂所形成的部分的周圍則由彈性體材料等軟質樹脂覆蓋。In the past, as a toothbrush for reducing excess toothbrushing pressure, for example, a toothbrush described in Patent Document 1 has been disclosed. In the toothbrush described in Patent Document 1, when brushing teeth with a palm grip, the part of the handle part held by the thumb and forefinger is formed of a thermoplastic resin that opens to the side of the grafting surface. U-shaped, and the part made of thermoplastic resin is covered with soft resin such as elastomer material.

專利文獻1中針對所述結構的牙刷，記載有下述內容：藉由將刷頭部的負荷不僅將彈力施加於頸部而且還施加於手柄部的所述部位，在不損害牙齦的情況下，在賦予溫和接觸牙齒和牙齦而舒適的操作性的同時，降低了過剩的刷牙壓力。 [現有技術文獻] [專利文獻]With regard to the toothbrush of the above-mentioned structure, Patent Document 1 describes that by applying the load of the head of the brush not only the elastic force to the neck but also to the part of the handle part, the gums are not damaged. , While giving gentle touch to the teeth and gums and comfortable operability, it also reduces the excess pressure of brushing. [Prior Art Literature] [Patent Literature]

[專利文獻1]日本專利特開2000-004944號公報[Patent Document 1] Japanese Patent Laid-Open No. 2000-004944

[發明所欲解決之課題] 但是，專利文獻1的牙刷由於頸部具有全方位的柔軟性，因此在刷牙時難以將刷部穩定地接觸目標的部位。[The problem to be solved by the invention] However, since the toothbrush of Patent Document 1 has omnidirectional flexibility in the neck, it is difficult to stably touch the brush portion to the target site when brushing teeth.

本發明是考慮如以上所述的情況而成者，其目的在於提供具有所謂在維持適當的刷牙壓力的同時，能夠好好地對目標部位進行刷牙的良好的操作性的牙刷。 [解決課題之手段]The present invention was made in consideration of the above-mentioned circumstances, and its object is to provide a toothbrush having a so-called good operability capable of brushing a target site while maintaining an appropriate brushing pressure. [Means to solve the problem]

若跟隨本發明的第一型態，提供一種牙刷，其特徵在於，包括：刷頭部，具有設置於長軸方向的前端側的植毛面；握持部，配置於較所述刷頭部更後端側；頸部，配置於所述植毛面及所述握持部之間，所述刷頭部及所述頸部的至少一部分由硬質樹脂所形成；變形部，配置於所述握持部，藉由與所述植毛面正交的第一方向的外力而變形；第一區域，配置於所述變形部的所述前端側，藉由所述第一方向的外力而非變形；以及第二區域，配置於所述變形部的所述後端側，藉由所述第一方向的外力而非變形，所述握持部的在所述長軸方向上至少自所述握持部的前端遍及所述第二區域，且在與所述長軸方向正交的剖面的至少一部分由所述硬質樹脂形成，所述變形部具有：硬質部，由連接所述第一區域與所述第二區域的所述硬質樹脂而形成；以及軟質部，由軟質樹脂所形成，且覆蓋所述硬質部的至少一部分，在與所述長軸方向正交的剖面中，相對於由所述變形部的外形輪廓或所述外形輪廓的延長線所包圍的封閉空間的截面積，所述硬質部的截面積的佔有率遍及所述長軸方向為35%以下，所述變形部向所述第一方向的彎曲強度被規範為小於向所述長軸方向及與所述第一方向正交的第二方向的彎曲強度，所述軟質部具有凹凸結構部，所述凹凸結構部中，在與所述長軸方向交叉的方向上延長的凹部和凸部在所述長軸方向上互相相鄰配置，所述凹凸結構部分別露出並設置於所述第一方向的所述植毛面側、和與所述第一方向的所述植毛面側為相對側的背面側。According to the first aspect of the present invention, a toothbrush is provided, which is characterized by comprising: a brush head portion having a tufted surface arranged on the front end side of the long axis direction; The rear end side; the neck, which is arranged between the flocking surface and the grip, at least a part of the brush head and the neck is formed of hard resin; the deformed part, which is arranged on the grip Part, which is deformed by an external force in a first direction orthogonal to the tufting surface; a first area is disposed on the front end side of the deforming part, and is not deformed by an external force in the first direction; and The second area is disposed on the rear end side of the deforming portion, and is not deformed by the external force in the first direction, and the grip portion is at least from the grip portion in the long axis direction. The front end of the second region extends over the second region, and at least a part of the cross section orthogonal to the long axis direction is formed of the hard resin, and the deformed portion has: a hard portion that connects the first region and the The second region is formed of the hard resin; and the soft part is formed of a soft resin and covers at least a part of the hard part. In a cross section orthogonal to the long axis direction, compared to the deformation The cross-sectional area of the enclosed space surrounded by the outer contour of the outer contour or the extension line of the outer contour, the cross-sectional area of the hard portion is 35% or less across the major axis direction, and the deformed portion faces the first The bending strength in one direction is regulated to be smaller than the bending strength in the long axis direction and the second direction orthogonal to the first direction. The soft portion has a concavo-convex structure portion. The concave portion and the convex portion extending in the direction intersecting the long axis direction are arranged adjacent to each other in the long axis direction, and the concave and convex structure portions are respectively exposed and provided on the flocking surface side of the first direction, and The side of the flocking surface in the first direction is the back side of the opposite side.

另外，所述本發明的一形態的牙刷中的特徵在於，所述凹部相對於所述凸部的深度相對於所述變形部的所述第一方向的最大厚度而言為2%以上、20%以下。In addition, the toothbrush according to one aspect of the present invention is characterized in that the depth of the concave portion with respect to the convex portion is 2% or more and 20% with respect to the maximum thickness of the deformed portion in the first direction. %the following.

另外，所述本發明的一形態的牙刷中的特徵在於，所述變形部的與所述長軸方向正交的截面為多邊形，所述變形部的所述第二方向的兩側分別設置有所述凹凸結構部。In addition, the toothbrush according to one aspect of the present invention is characterized in that a cross section of the deformed portion orthogonal to the long axis direction is a polygon, and the deformed portion is provided on both sides of the second direction. The concave-convex structure portion.

另外，所述本發明的一形態的牙刷中的特徵在於，所述變形部的所述第二方向的最外輪廓相較於所述變形部的所述第一方向的中心位置而言位於更靠所述背面側。In addition, the toothbrush according to one aspect of the present invention is characterized in that the outermost contour of the deformed portion in the second direction is located more than the center position of the deformed portion in the first direction. Lean on the back side.

另外，所述本發明的一形態的牙刷中的特徵在於，所述變形部經由貫穿所述第一方向且於所述長軸方向延長的貫穿孔於所述第二方向上分支，分支的所述變形部分別具有：所述硬質部經由所述貫穿孔分支且連接所述第一區域和所述第二區部的芯部；以及所述軟質部對經由所述貫穿孔而分支的所述芯部的周圍進行覆蓋的覆蓋部。In addition, the toothbrush according to one aspect of the present invention is characterized in that the deformed portion is branched in the second direction via a through hole that penetrates the first direction and extends in the long axis direction, and the branched portion The deformed portions each have: the hard portion branches via the through hole and connects the core portion of the first region and the second region portion; and the pair of soft portions that are branched via the through hole A covering part that covers the periphery of the core part.

另外，所述本發明的一形態的牙刷中的特徵在於，所述硬質部具有與所述芯部分離，並在所述長軸方向上貫穿所述貫穿孔而連接所述第一區域和所述第二區域的反轉部，所述反轉部在第一方向的外力超過閾值時會跳躍屈曲（leap buckling）而反轉。In addition, the toothbrush according to one aspect of the present invention is characterized in that the hard part has a separation from the core part, and penetrates the through hole in the long axis direction to connect the first region and the core part. In the reversal portion of the second region, the reversal portion will leap buckling and reverse when the external force in the first direction exceeds a threshold value.

另外，所述本發明的一形態的牙刷中的特徵在於，所述硬質部為平板狀，所述硬質部的所述第二方向的長度大於所述硬質部的所述第一方向的長度。In addition, the toothbrush according to one aspect of the present invention is characterized in that the hard portion is a flat plate, and the length of the hard portion in the second direction is greater than the length of the hard portion in the first direction.

另外，所述本發明的一形態的牙刷中的特徵在於，所述硬質部的所述第一方向的中心相較於所述變形部的所述第一方向的中心位置而言位於更靠所述背面側。In addition, the toothbrush according to one aspect of the present invention is characterized in that the center of the hard portion in the first direction is located closer to the center of the deformed portion in the first direction. The back side.

另外，所述本發明的一形態的牙刷中的特徵在於，所述變形部的所述長軸方向的長度為15 mm以上、30 mm以下。In addition, the toothbrush according to one aspect of the present invention is characterized in that the length of the deformed portion in the major axis direction is 15 mm or more and 30 mm or less.

另外，所述本發明的一形態的牙刷中的特徵在於，所述變形部的所述第二方向的長度為5 mm以上、20 mm以下。 [發明的效果]In addition, the toothbrush according to the one aspect of the present invention is characterized in that the length of the deformed portion in the second direction is 5 mm or more and 20 mm or less. [Effects of the invention]

本發明中，可以提供在維持適當的刷牙壓力的同時，能夠正確地對每顆牙齒的齒列進行刷牙的牙刷。In the present invention, it is possible to provide a toothbrush capable of accurately brushing the dentition of each tooth while maintaining an appropriate brushing pressure.

[第一實施方式] 以下，參照圖1～圖6對本發明的牙刷的第一實施方式進行說明。 再者，以下的實施方式是表示本發明的一形態者，並不限定本發明，可於本發明的技術思想的範圍內任意地進行變更。另外，於以下的圖式中，為了容易理解各構成，使實際的結構與各結構的比例尺或數量等不同。另外，在以下的說明中，將側視中與植毛面正交的方向設為厚度方向，在厚度方向上植毛面側設為正面側，與植毛面相反的側設為背面側，對此進行適當說明。[First Embodiment] Hereinafter, the first embodiment of the toothbrush of the present invention will be described with reference to FIGS. 1 to 6. In addition, the following embodiment shows one aspect of the present invention, and does not limit the present invention, and can be changed arbitrarily within the scope of the technical idea of the present invention. In addition, in the following drawings, in order to make it easier to understand each structure, the actual structure is different from the scale or number of each structure. In addition, in the following description, the direction orthogonal to the flocking surface in a side view is the thickness direction, the flocking surface side is the front side in the thickness direction, and the side opposite to the flocking surface is the back side. Proper description.

圖1是牙刷1的正面圖。圖2是以包含寬度方向（圖1的上下方向）的中心的平面切斷牙刷1的剖面圖。FIG. 1 is a front view of the toothbrush 1. As shown in FIG. Fig. 2 is a cross-sectional view of the toothbrush 1 cut through a plane including the center in the width direction (the vertical direction in Fig. 1 ).

本實施方式的牙刷1包括：刷頭部10，配置於長軸方向的前端側（以下，僅稱為前端側），植毛有刷毛的毛束（未圖示）；頸部20，延設於刷頭部10的長軸方向後端側（以下，僅稱為後端側）；以及握持部30，延設於頸部20的後端側且具有變形部70（以下，將刷頭部10、頸部20及握持部30合起來稱為手柄體2）。The toothbrush 1 of the present embodiment includes: a brush head portion 10 arranged on the front end side in the long axis direction (hereinafter referred to as only the front end side), and a tuft of bristles (not shown) where the bristles are implanted; and the neck portion 20 is extended on The rear end side of the major axis direction of the brush head 10 (hereinafter referred to as only the rear end side); and the grip portion 30, which extends on the rear end side of the neck 20 and has a deformed portion 70 (hereinafter, the brush head 10. The neck 20 and the grip 30 are collectively called the handle body 2).

本實施方式的牙刷1是將由硬質樹脂所形成的硬質部H、及由軟質樹脂所形成的軟質部E一體成形而成的成形體。硬質部H構成刷頭部10、頸部20、以及包含變形部70的握持部30各自的至少一部分。軟質部E構成包含變形部70的握持部30的一部分。更詳細而言，本實施方式的刷頭部10及頸部20各自由硬質樹脂所形成，例如表面的一部分由所述軟質樹脂所覆蓋，亦可以一部分由所述軟質樹脂形成。本實施方式的包含變形部70的握持部30的一部分各自由硬質樹脂與軟質樹脂兩者形成（詳情後述）。The toothbrush 1 of this embodiment is a molded body which integrally molded the hard part H formed of hard resin, and the soft part E formed of soft resin. The hard part H constitutes at least a part of each of the head part 10, the neck part 20, and the grip part 30 including the deformed part 70. The soft portion E constitutes a part of the grip portion 30 including the deformable portion 70. In more detail, each of the brush head portion 10 and the neck portion 20 of the present embodiment is formed of a hard resin. For example, a part of the surface is covered with the soft resin, or a part of the surface may be formed of the soft resin. Part of the grip portion 30 including the deformable portion 70 of the present embodiment is each formed of both hard resin and soft resin (details will be described later).

[刷頭部10] 刷頭部10於厚度方向（圖1中與紙面正交的方向）的一側具有植毛面11。再者，以後將與所述厚度方向及長軸方向正交的方向設為寬度方向（或適宜設為側面方向）。於植毛面11形成有多個植毛孔12。於植毛孔12植設有刷毛的毛束（未圖示）。[Brush head 10] The brush head 10 has a tufting surface 11 on one side in the thickness direction (the direction orthogonal to the paper surface in FIG. 1 ). In addition, hereafter, let the direction orthogonal to the said thickness direction and the long axis direction be a width direction (or a side direction as appropriate). A plurality of tufting holes 12 are formed on the tufting surface 11. The tufts of bristles (not shown) are implanted in the tuft holes 12.

刷頭部10的寬度，即於正面側與植毛面11平行、且與長軸方向正交的寬度方向的長度（以下，僅稱為寬度）並無特別限定，例如較佳為7 mm以上、13 mm以下。若為所述下限值以上，則可充分地確保植設毛束的面積，若為所述上限值以下，則可進一步提高口腔內的操作性。The width of the brush head 10, that is, the length in the width direction (hereinafter, simply referred to as the width) that is parallel to the tufting surface 11 on the front side and orthogonal to the long axis direction is not particularly limited. For example, it is preferably 7 mm or more, Below 13 mm. If it is more than the said lower limit, the area of the implanted hair bundle can be fully ensured, and if it is less than the said upper limit, the operability in the oral cavity can be improved further.

刷頭部10的長軸方向的長度（以下，僅稱為長度）並無特別限定，例如較佳為10 mm以上、33 mm以下。若刷頭部10的長度為所述下限值以上，則可充分地確保植設毛束的面積，若為所述上限值以下，則可進一步提高口腔內的操作性。再者，將本實施方式的頸部20與刷頭部10的長軸方向的邊界設為自頸部20朝向刷頭部10方向，頸部20的寬度變成最小值的位置。當頸部20的寬度成為最小值的區域以設定的長度存在的情況下（當頸部20的寬度為最小值的位置不是一個位置），在頸部20與刷頭部10之間的長軸方向上的邊界位於頸部20的寬度成為最小值的最頭前端側位置。The length in the major axis direction of the brush head portion 10 (hereinafter, simply referred to as length) is not particularly limited, and for example, it is preferably 10 mm or more and 33 mm or less. If the length of the brush head part 10 is more than the said lower limit, the area of an implantation tuft can be fully ensured, and if it is less than the said upper limit, the operability in an oral cavity can be improved further. In addition, the boundary of the long axis direction of the neck part 20 of this embodiment and the brush head part 10 is set to the position from the neck part 20 to the direction of the brush head part 10, and the width of the neck part 20 becomes a minimum value. When the area where the width of the neck 20 becomes the minimum exists at the set length (when the position where the width of the neck 20 is the minimum is not a position), the long axis between the neck 20 and the brush head 10 The boundary in the direction is located at the foremost tip side where the width of the neck portion 20 becomes the minimum.

刷頭部10的厚度方向的長度（以下，僅稱為厚度）可考慮材質等來決定，較佳為2.0 mm以上、4.0 mm以下。若刷頭部10的厚度為所述下限值以上，則可進一步提高刷頭部10的強度。若刷頭部10的厚度為所述上限值以下，則可提高朝臼齒的內部的到達性，並且可進一步提高口腔內的操作性。The length of the brush head 10 in the thickness direction (hereinafter, simply referred to as thickness) can be determined in consideration of the material, etc., and is preferably 2.0 mm or more and 4.0 mm or less. If the thickness of the head part 10 is more than the said lower limit, the strength of the head part 10 can be improved further. If the thickness of the brush head portion 10 is equal to or less than the upper limit value, the reachability to the inside of the molar tooth can be improved, and the operability in the oral cavity can be further improved.

毛束是將多個刷毛捆紮而成者。自植毛面11至毛束的前端為止的長度（毛長）可考慮對毛束所要求的毛腰等來決定，例如設為6 mm～13 mm。所有毛束的毛長可相同，亦可相互不同。The bristle bundle is formed by bundling a plurality of bristles. The length (hair length) from the tuft surface 11 to the tip of the hair bundle can be determined in consideration of the hair waist required for the hair bundle, and is set to 6 mm to 13 mm, for example. The hair length of all hair bundles can be the same or different from each other.

毛束的粗度（毛束直徑）可考慮對毛束所要求的毛腰等來決定，例如設為1 mm～3 mm。所有毛束的毛束直徑可相同，亦可相互不同。The thickness of the hair bundle (hair bundle diameter) can be determined in consideration of the hair waist required for the hair bundle, for example, set to 1 mm to 3 mm. The diameter of the hair bundles of all hair bundles can be the same or different from each other.

作為構成毛束的刷毛，例如可列舉：其直徑朝向毛尖逐漸變小且毛尖經尖銳化的刷毛（錐形毛）、其直徑自植毛面11朝向毛尖大致相同的刷毛（直毛）等。作為直毛，可列舉：將毛尖設為與植毛面11大致平行的平面者、或將毛尖弄圓成半球狀者。Examples of the bristles constituting the bristle bundle include bristles (tapered bristles) whose diameter gradually becomes smaller toward the tip of the bristles and whose tip is sharpened, and bristles (straight bristles) whose diameter is approximately the same from the transplanted surface 11 toward the tip of the bristles. Examples of straight hairs include those in which the hair tips are made into a plane approximately parallel to the tuft surface 11, or those in which the hair tips are rounded into a hemispherical shape.

刷毛的材質例如可列舉：6-12尼龍（6-12NY）、6-10尼龍（6-10NY）等聚醯胺，聚對苯二甲酸乙二酯（Polyethylene Terephthalate，PET）、聚對苯二甲酸丁二酯（Polybutylene Terephthalate，PBT）、聚對苯二甲酸丙二酯（Polytrimethylene Terephthalate，PTT）、聚萘二甲酸乙二酯（Polyethylene Naphthalate，PEN）、聚萘二甲酸丁二酯（Polybutylene Naphthalate，PBN）等聚酯，聚丙烯（Polypropylene，PP）等聚烯烴，聚烯烴系彈性體，苯乙烯系彈性體等彈性體樹脂等。該些樹脂材料可單獨使用一種、或將兩種以上組合使用。另外，作為刷毛，可列舉具有多重芯結構的聚酯製刷毛，所述多重芯結構具有芯部與設置於所述芯部的外側的至少一層以上的鞘部。The material of the bristles includes, for example, polyamides such as 6-12 nylon (6-12NY) and 6-10 nylon (6-10NY), polyethylene terephthalate (PET), and polyethylene terephthalate. Polybutylene Terephthalate (PBT), Polytrimethylene Terephthalate (PTT), Polyethylene Naphthalate (PEN), Polybutylene Naphthalate (Polybutylene Naphthalate) , PBN) and other polyesters, polypropylene (Polypropylene, PP) and other polyolefins, polyolefin-based elastomers, styrene-based elastomers and other elastomer resins. These resin materials can be used alone or in combination of two or more. In addition, examples of the bristles include polyester bristles having a multiple core structure having a core portion and at least one or more sheath portions provided on the outer side of the core portion.

刷毛的橫剖面形狀並無特別限定，可設為正圓形、橢圓形等圓形，多邊形，星形，三葉的三葉草形，四葉的三葉草形等。所有刷毛的剖面形狀可相同，亦可不同。The cross-sectional shape of the bristles is not particularly limited, and can be round, polygonal, star-shaped, three-leaf clover, four-leaf clover, etc., such as a perfect circle and an ellipse. The cross-sectional shape of all bristles can be the same or different.

刷毛的粗度可考慮材質等來決定，於橫剖面為圓形的情況下，例如設為6 mil～9 mil（1 mil＝1/1000 inch＝0.025 mm）。另外，亦可考慮使用感、刷掃感、清潔效果、耐久性等而將粗度不同的多根刷毛任意地組合使用。The thickness of the bristles can be determined in consideration of the material, etc., in the case of a circular cross section, for example, set to 6 mil to 9 mil (1 mil = 1/1000 inch = 0.025 mm). In addition, a plurality of bristles having different thicknesses may be arbitrarily used in combination in consideration of usability, brushing sensation, cleaning effect, durability, and the like.

[頸部20] 就操作性的觀點而言，頸部20的長度較佳為40 mm以上、70 mm以下。 頸部20的寬度作為一例，以自成為最小值的位置朝後端側逐漸變大的方式形成。本實施方式的頸部20的寬度以隨著自成為最小值的位置朝向後端側逐漸變大的方式形成。另外，頸部20的厚度以隨著自成為最小的位置朝向後端側逐漸變大的方式形成。[Neck 20] From the viewpoint of operability, the length of the neck portion 20 is preferably 40 mm or more and 70 mm or less. As an example, the width of the neck portion 20 is formed so as to gradually increase from the minimum position toward the rear end side. The width of the neck portion 20 of the present embodiment is formed so as to gradually increase from the position of the minimum value toward the rear end side. In addition, the thickness of the neck portion 20 is formed so as to gradually increase toward the rear end side from the smallest position.

頸部20較佳為成為最小的位置上的寬度與厚度均為3.0 mm以上、4.5 mm以下。若成為最小的位置上的頸部20的寬度與厚度為所述下限值以上，則可進一步提高頸部20的強度，若為所述上限值以下，則嘴唇容易閉合，另外，可提高朝臼齒的到達性，並且可進一步提高口腔內的操作性。以隨著自變成最小值的位置朝向後端側逐漸變大的方式形成的頸部20的寬度及厚度可考慮材質等而適宜決定。It is preferable that the width and thickness of the neck portion 20 at the smallest position are both 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 greater than or equal to the lower limit, the strength of the neck portion 20 can be further increased. If the width and thickness of the neck portion 20 are less than the upper limit value, the lips can be easily closed, and the It can reach the molars and can further improve the operability in the oral cavity. The width and thickness of the neck portion 20 formed so as to gradually increase toward the rear end side as the position becomes the minimum value can be appropriately determined in consideration of the material and the like.

頸部20的側視方向中的正面側隨著朝向後端側而朝面向正面側的方向傾斜。頸部20的側面方向觀察的背面側隨著朝向後端側而朝面向背面側的方向傾斜。於正視中，頸部20朝與寬度方向中心的距離隨著朝向後端側而變大的方向傾斜。The front side in the side view direction of the neck portion 20 is inclined toward the front side as it goes to the rear end side. The back side of the neck portion 20 when viewed from the side surface direction is inclined toward the back side as it goes to the rear end side. In front view, the neck portion 20 is inclined in a direction in which the distance from the center in the width direction becomes larger toward the rear end side.

將本實施方式的頸部20與握持部30的邊界設為後述的變形部70所設置的頸部20側前端的位置。此處，與於正視及側視兩者中，寬度以圓弧狀的輪廓自頸部20朝握持部30擴大，且該圓弧的曲率中心的位置已變化的長軸方向的位置一致。更詳細而言，頸部20與握持部30（變形部70）的邊界於圖1中所示的正視中，與曲率中心已自圓弧狀的輪廓的外側朝寬度方向中心側變化的長軸方向的位置一致。另外，於圖2中所示的側視中，頸部20與握持部30（變形部70）的邊界與曲率中心已自圓弧狀的輪廓的外側朝厚度方向中心側變化的長軸方向的位置一致。The boundary between the neck portion 20 and the grip portion 30 of the present embodiment is set to the position of the front end on the side of the neck portion 20 where the deformable portion 70 described later is provided. Here, it coincides with the position in the long axis direction in which the width of the arc-shaped contour expands from the neck portion 20 toward the grip portion 30 in both the front view and the side view, and the position of the center of curvature of the arc has changed. In more detail, the boundary between the neck portion 20 and the grip portion 30 (deformed portion 70) in the front view shown in FIG. 1 is the same as the length of the center of curvature that has changed from the outer side of the arc-shaped contour toward the center side in the width direction. The position in the axis direction is the same. In addition, in the side view shown in FIG. 2, the boundary between the neck portion 20 and the grip portion 30 (deformed portion 70) and the center of curvature have changed from the outer side of the arc-shaped contour toward the center side in the thickness direction. The location is the same.

[握持部30] 握持部30沿著長軸方向來配置。握持部30於形成與頸部20的邊界的前端側具有變形部70。如圖1所示，比變形部70更後端側的握持部30的寬度隨著自與變形部70的邊界朝向後端側逐漸變窄後，以大致固定的長度延長。如圖2所示，比變形部70更後端側的握持部30的厚度隨著自與變形部70的邊界朝向後端側逐漸變窄後，以大致固定的長度延長。握持部30的寬度隨著自與變形部70的邊界朝向後端側逐漸變窄後成為大致固定的長度的長軸方向的位置、與握持部30的厚度隨著自與變形部70的邊界朝向後端側逐漸變窄後成為大致固定的長度的長軸方向的位置相同。本實施方式中變形部70的後端的位置設為軟質部70E與硬質部30H的邊界。[Grip 30] The grip 30 is arranged along the long axis direction. The grip portion 30 has a deformed portion 70 on the front end side forming a boundary with the neck portion 20. As shown in FIG. 1, the width of the grip portion 30 on the rear end side than the deformed portion 70 gradually narrows from the boundary with the deformed portion 70 toward the rear end side, and then is extended by a substantially constant length. As shown in FIG. 2, the thickness of the grip portion 30 on the rear end side than the deformed portion 70 gradually becomes narrower from the boundary with the deformed portion 70 toward the rear end side, and then is extended by a substantially constant length. The width of the grip portion 30 gradually narrows from the boundary with the deformable portion 70 toward the rear end side, and then becomes a position in the major axis direction of a substantially constant length, and the thickness of the grip portion 30 increases with the thickness of the deformable portion 70. The boundary gradually narrows toward the rear end side and becomes a substantially constant length at the same position in the major axis direction. In the present embodiment, the position of the rear end of the deformed portion 70 is defined as the boundary between the soft portion 70E and the hard portion 30H.

握持部30於較變形部70的後端側端部更後端側，於正面側寬度方向的中央具有軟質部31E。軟質部31E構成軟質部E的一部分。軟質部31E於正視中隨著自變形部70的後端側端部朝向後端側逐漸變窄後，以大致固定的長度延長。於正視中，軟質部31E的側緣與握持部30的寬度方向外側的側緣以大致固定的距離來形成。The grip portion 30 has a soft portion 31E at the rear end side of the rear end side end portion of the deformed portion 70 and at the center in the width direction of the front side. The soft portion 31E constitutes a part of the soft portion E. The soft portion 31E gradually narrows from the rear end side end of the deformable portion 70 toward the rear end side in a front view, and then extends by a substantially constant length. In front view, the side edge of the soft portion 31E and the side edge of the grip portion 30 on the outside in the width direction are formed at a substantially constant distance.

握持部30具有設置於變形部70的硬質部70H（參照圖2至圖4）、以及設置於較變形部70更後端側的硬質部30H。硬質部30H、硬質部70H構成硬質部H的一部分。於正面側，硬質部30H具有埋設軟質部31E的凹處31H。於正視中，凹處31H隨著自變形部70的後端朝向後端側逐漸變窄後以大致固定的長度於長軸方向延長。埋設於凹處31H的軟質部31E的一部分比於正面側露出的硬質部30H更突出。其他的軟質部31E與於正面側露出的硬質部30H大致為同一面。The grip portion 30 has a hard portion 70H (refer to FIGS. 2 to 4) provided on the deformed portion 70, and a hard portion 30H provided on the rear end side of the deformed portion 70. The hard portion 30H and the hard portion 70H constitute a part of the hard portion H. On the front side, the hard part 30H has a recess 31H in which the soft part 31E is buried. In the front view, the recess 31H gradually narrows from the rear end of the deformable portion 70 toward the rear end side and then extends in the long axis direction by a substantially constant length. A part of the soft portion 31E buried in the recess 31H protrudes more than the hard portion 30H exposed on the front side. The other soft part 31E is substantially the same surface as the hard part 30H exposed on the front side.

握持部30於背面側的寬度方向的中央具有軟質部32E（參照圖1、圖2）。軟質部32E構成軟質部E的一部分。於正視中，軟質部32E具有與軟質部31E的外形輪廓大致相同的外形輪廓。即，軟質部32E隨著自變形部70的後端朝向後端側逐漸變窄後以大致固定的長度延長。於背視中，軟質部32E的側緣與握持部30的寬度方向外側的側緣以大致固定的距離來形成。The grip portion 30 has a soft portion 32E (refer to FIGS. 1 and 2) at the center in the width direction on the back side. The soft portion 32E constitutes a part of the soft portion E. In front view, the soft portion 32E has an outer contour substantially the same as the outer contour of the soft portion 31E. That is, the soft portion 32E is extended by a substantially constant length as it gradually narrows from the rear end of the deformable portion 70 toward the rear end side. In a back view, the side edge of the soft portion 32E and the side edge of the grip portion 30 on the outside in the width direction are formed at a substantially constant distance.

於背面側，硬質部30H具有埋設軟質部32E的一部分的凹處32H（參照圖2）。於背視中，凹處32H隨著自變形部70的後端朝向後端側逐漸變窄後以大致固定的長度延長。軟質部32E的一部分比於背面側露出的硬質部30H更突出。其他的軟質部32E與於正面側露出的硬質部30H大致為同一面。On the back side, the hard portion 30H has a recess 32H in which a part of the soft portion 32E is buried (see FIG. 2). In a back view, the recess 32H is extended by a substantially constant length as it gradually narrows from the rear end of the deformable portion 70 toward the rear end side. A part of the soft portion 32E protrudes more than the hard portion 30H exposed on the back side. The other soft part 32E is substantially the same surface as the hard part 30H exposed on the front side.

於握持部30的正面側設置有軟質部31E，於背面側設置有軟質部32E，因此握住握持部30時的握緊性提升。The soft portion 31E is provided on the front side of the grip portion 30, and the soft portion 32E is provided on the back side, so the grip when the grip portion 30 is gripped is improved.

[變形部70] 變形部70因與植毛面11正交的厚度方向的外力而變形。變形部70連接前端側的頸部（第一區域）20與後端側的握持部（第二區域）30。變形部70具有硬質部70H與軟質部70E。如圖1及圖2所示，變形部70具有滾紋部（凹凸結構部）101～滾紋部104。[Deformation part 70] The deformed portion 70 is deformed by an external force in the thickness direction perpendicular to the tufted surface 11. The deforming portion 70 connects the neck portion (first area) 20 on the front end side and the grip portion (second area) 30 on the rear end side. The deformed portion 70 has a hard portion 70H and a soft portion 70E. As shown in FIGS. 1 and 2, the deformed portion 70 has a knurled portion (concave-convex structure portion) 101 to a knurled portion 104.

圖3是在變形部70中與長軸方向正交的剖面圖，為圖1中於A-A線觀察的剖面圖。圖4是以包含寬度方向的中心的平面切斷變形部70的剖面圖。Fig. 3 is a cross-sectional view orthogonal to the long axis direction in the deformed portion 70, and is a cross-sectional view viewed on the line A-A in Fig. 1. 4 is a cross-sectional view of the deformed portion 70 cut by a plane including the center in the width direction.

如圖3所示，本實施方式中，硬質部70H的周圍被軟質部70E所覆蓋。變形部70的長軸方向的最大長度較佳為15 mm以上、30 mm以下。藉由將變形部70的長軸方向的最大長度設為15 mm以上，於使用者握住握持部30時，可充分地感受到變形部70的變形。另外，藉由將變形部70的長軸方向的最大長度設為30 mm以下，可抑制變形部容易過於彎曲。另外，握住的部分中的變形區域經限定而抑制操作性的下降。As shown in FIG. 3, in this embodiment, the periphery of the hard part 70H is covered by the soft part 70E. The maximum length in the major axis direction of the deformed portion 70 is preferably 15 mm or more and 30 mm or less. By setting the maximum length in the major axis direction of the deforming portion 70 to be 15 mm or more, when the user grips the grip portion 30, the deformation of the deforming portion 70 can be fully felt. In addition, by setting the maximum length in the major axis direction of the deformed portion 70 to 30 mm or less, it is possible to prevent the deformed portion from being easily bent too much. In addition, the deformation area in the gripped portion is limited to suppress the decrease in operability.

變形部70的與長軸方向正交的剖面的輪廓為於厚度方向的背面側偏心的多邊形。變形部70的剖面輪廓為埋設硬質部70H的軟質部70E的大致六邊形狀的外形輪廓。外形輪廓的六個頂點中，配置於厚度方向的中央（寬度方向兩端）的兩個頂點配置於較變形部70（軟質部70E）的厚度方向的中心更靠背面側。藉由將兩個頂點配置於較變形部70的厚度方向的中心更靠背面側，背面側變得較正面側薄，可使變形部70變得容易於背面側彎曲。 另外，由於在寬度方向兩端配置有在厚度方向上具有相同位置的兩個頂點，因此由於所述頂點位置處的壁厚較大，因此向寬度方向的彎曲阻力大。因此，變形部70難以向寬度方向彎曲。The profile of the cross-section orthogonal to the long axis direction of the deformed portion 70 is a polygon eccentric to the back side in the thickness direction. The cross-sectional profile of the deformed portion 70 is a substantially hexagonal outline of the soft portion 70E in which the hard portion 70H is embedded. Of the six vertices of the outer contour, two vertices arranged in the center in the thickness direction (both ends in the width direction) are arranged on the back side of the deformed portion 70 (soft portion 70E) in the thickness direction. By arranging the two vertices on the back side from the center of the thickness direction of the deformed portion 70, the back side becomes thinner than the front side, and the deformed portion 70 can be easily bent on the back side. In addition, since two vertices having the same position in the thickness direction are arranged at both ends in the width direction, since the wall thickness at the apex position is large, the bending resistance in the width direction is large. Therefore, the deformed portion 70 is difficult to bend in the width direction.

如圖3所示，硬質部70H的剖面形狀形成為寬度大於厚度、且向寬度方向延長的矩形狀。由於硬質部70H的寬度大於厚度，因此成為具有所謂的容易向厚度方向彎曲，難以向寬度方向彎曲的彎曲行為（與彎曲相關的各向異性）。換句話說，變形部70因為具有形成為寬度大於厚度、且向寬度方向延長的矩形狀的剖面的硬質部70H，因此厚度方向的彎曲強度被規範為小於寬度方向的彎曲強度。As shown in FIG. 3, the cross-sectional shape of the hard part 70H is formed in the rectangular shape which is wider than the thickness and extended in the width direction. Since the width of the hard portion 70H is greater than the thickness, it has a so-called bending behavior (anisotropy related to bending) that is easy to bend in the thickness direction and is difficult to bend in the width direction. In other words, since the deformed portion 70 has the hard portion 70H formed into a rectangular cross-section that is wider than the thickness and extends in the width direction, the bending strength in the thickness direction is regulated to be smaller than the bending strength in the width direction.

硬質部70H的厚度方向的中心位置經配置於較變形部70的厚度方向的中心位置更靠背面側。即，硬質部70H於厚度方向的背面側經偏心地配置。The center position in the thickness direction of the hard portion 70H is arranged on the back side of the center position in the thickness direction of the deformed portion 70. That is, the hard portion 70H is eccentrically arranged on the back side in the thickness direction.

與長軸方向正交的剖面中，相對於由變形部70的外形輪廓或外形輪廓的延長線所包圍的封閉空間的截面積，硬質部70H的截面積的佔有率遍及長軸方向為35%以下。如圖3所示，變形部70的外形輪廓於形成封閉空間的情況下，所述封閉空間的面積為變形部70的截面積。藉由將硬質部70H的截面積的佔有率遍及長軸方向設為變形部70的截面積的35%以下，可以使變形部70的向背面側的彎曲強度變小。所述佔有率較佳為25%以下，更佳為15%以下。另外，所述佔有率較佳為3%以上。In the cross section orthogonal to the long axis direction, the cross-sectional area of the hard portion 70H occupies 35% in the long axis direction with respect to the cross-sectional area of the closed space enclosed by the outer contour of the deformed portion 70 or the extension line of the outer contour. the following. As shown in FIG. 3, when the contour of the deformed portion 70 forms a closed space, the area of the closed space is the cross-sectional area of the deformed portion 70. By setting the occupancy rate of the cross-sectional area of the hard portion 70H to 35% or less of the cross-sectional area of the deformed portion 70 in the major axis direction, the bending strength of the deformed portion 70 toward the back side can be reduced. The occupancy rate is preferably 25% or less, more preferably 15% or less. In addition, the occupancy rate is preferably 3% or more.

於變形部70的正面側、背面側及寬度方向兩側的側緣分別露出並設置有波紋部101～波紋部104。更詳細而言，於變形部70的正面側的軟質部70E露出並設置有波紋部101，於變形部70的背面側的軟質部70E露出並設置有波紋部102。Corrugated parts 101 to 104 are respectively exposed on the front side, back side, and side edges of both sides in the width direction of the deforming part 70. In more detail, the soft portion 70E on the front side of the deformed portion 70 is exposed and provided with the corrugated portion 101, and the soft portion 70E on the back side of the deformed portion 70 is exposed and provided with the corrugated portion 102.

如圖1所示，波紋部101、波紋部102分別具有在與長軸方向交叉的方向上延長、且在所述長軸方向上互相相鄰而配置多個的凹部111與凸部112。本實施方式中凹部111與凸部112於寬度方向延長。即，凹部111為於寬度方向延長的溝狀。凸部112為於寬度方向延長的突起。如圖4所示，以包含寬度方向的中心的平面切斷的凹部111的剖面為向厚度方向中心側凹陷的圓弧形狀。以包含寬度方向的中心的平面切斷的凸部112的剖面為向厚度方向外側突出的圓弧形狀。As shown in FIG. 1, the corrugated portion 101 and the corrugated portion 102 each have a plurality of concave portions 111 and convex portions 112 that are elongated in a direction intersecting the long axis direction and are arranged adjacent to each other in the long axis direction. In this embodiment, the concave portion 111 and the convex portion 112 extend in the width direction. That is, the recess 111 has a groove shape extending in the width direction. The convex portion 112 is a protrusion extending in the width direction. As shown in FIG. 4, the cross section of the recessed part 111 cut|disconnected by the plane containing the center of a width direction is a circular arc shape recessed toward the center side of a thickness direction. The cross section of the convex portion 112 cut by a plane including the center in the width direction has an arc shape protruding outward in the thickness direction.

藉由於長軸方向設置多個形成於變形部70的正面側及背面側、在寬度方向延長的薄壁部的凹部111，可以凹部111為中心而使變形部容易向背面側及正面側彎曲。因此，長軸方向的凹部111的位置較佳為設為與波紋部101、波紋部102中的凹部彼此相同。Since a plurality of recesses 111 formed on the front side and the back side of the deformed part 70 and elongated in the width direction are provided in the longitudinal direction, the deformed part can be easily bent to the back side and the front side by using the recessed part 111 as the center. Therefore, the position of the recess 111 in the longitudinal direction is preferably the same as the recesses in the corrugated part 101 and the corrugated part 102.

相對於凸部112的凹部111的深度（自凸部112的頂點位置到凹部111的最凹陷的位置為止的厚度方向的距離）相對於變形部70的最大厚度較佳為2%以上、20%以下。於凹部111的深度相對於變形部70的最大厚度未滿2%的情況下，具有不有效地顯現變形部70的厚度方向的彎曲的可能性。若凹部111的深度相對於變形部70的最大厚度超過20%，則有握持部30容易彎曲而操作性受損的可能性。因此，藉由將凹部111的深度相對於變形部70的最大厚度設為2%以上、20%以下，在確保操作性的狀態下，使變形部70變得容易於背面側及正面側彎曲。The depth of the concave portion 111 relative to the convex portion 112 (the distance in the thickness direction from the vertex position of the convex portion 112 to the most concave position of the concave portion 111) relative to the maximum thickness of the deformed portion 70 is preferably 2% or more and 20% the following. When the depth of the recessed portion 111 is less than 2% of the maximum thickness of the deformed portion 70, there is a possibility that the curvature of the deformed portion 70 in the thickness direction may not be effectively expressed. If the depth of the recessed portion 111 exceeds 20% with respect to the maximum thickness of the deformed portion 70, the grip portion 30 may be easily bent and the operability may be impaired. Therefore, by setting the depth of the recessed portion 111 to 2% or more and 20% or less with respect to the maximum thickness of the deformed portion 70, the deformed portion 70 can be easily bent on the back side and the front side while ensuring operability.

波紋部101中凹部111的深度與波紋部102中凹部111的深度可不同，自將正面側與背面側的操作性及向厚度方向的彎曲特性設為相同的觀點，凹部111的深度較佳為相同。The depth of the concave portion 111 in the corrugated portion 101 and the depth of the concave portion 111 in the corrugated portion 102 may be different. From the viewpoint that the operability and the bending characteristics in the thickness direction of the front side and the back side are the same, the depth of the concave portion 111 is preferably the same.

波紋部101、波紋部102的最大寬度，即作為變形部70的最大寬度較佳為8 mm以上、20 mm以下。於變形部70的最大寬度未滿8 mm的情況下，有握持部30容易彎曲而操作性受損的可能性。另外，若變形部70的最大寬度超過20 mm，則有不有效地顯現變形部70的厚度方向的彎曲的可能性。因此，藉由將波紋部101、波紋部102的最大寬度設為8 mm以上、20 mm以下，在確保操作性的狀態下，使變形部70變得容易於背面側及正面側彎曲。The maximum width of the corrugated portion 101 and the corrugated portion 102, that is, the maximum width of the deformed portion 70, is preferably 8 mm or more and 20 mm or less. When the maximum width of the deformed portion 70 is less than 8 mm, the grip portion 30 may be easily bent and the operability may be impaired. In addition, if the maximum width of the deformed portion 70 exceeds 20 mm, there is a possibility that the curvature of the deformed portion 70 in the thickness direction may not be effectively expressed. Therefore, by setting the maximum width of the corrugated portion 101 and the corrugated portion 102 to 8 mm or more and 20 mm or less, the deformable portion 70 can be easily bent on the back side and the front side while ensuring operability.

作為波紋部101、波紋部102中的凹部111及凸部112的長軸方向的排列間距RP，較佳為變形部70的長軸方向的長度的9%以上、26%以下。於排列間距RP未滿9%的情況下，有不充分地顯現變形部70的彎曲的可能性。於排列間距RP超過26%的情況下，有變形部70過於容易彎曲而操作性受損的可能性。因此，藉由將波紋部101、波紋部102中的凹部111及凸部112的長軸方向的排列間距RP設為變形部70的長軸方向的長度的9%以上、26%以下，在確保操作性的狀態下，使變形部70變得容易於背面側及正面側彎曲。The arrangement pitch RP of the long axis direction of the concave portion 111 and the convex portion 112 in the corrugated portion 101 and the corrugated portion 102 is preferably 9% or more and 26% or less of the length of the deformation portion 70 in the long axis direction. In the case where the arrangement pitch RP is less than 9%, there is a possibility that the bending of the deformed portion 70 is insufficiently expressed. When the arrangement pitch RP exceeds 26%, the deformed portion 70 may be bent too easily and the operability may be impaired. Therefore, by setting the arrangement pitch RP in the long axis direction of the concave portion 111 and the convex portion 112 in the corrugated portion 101 and the corrugated portion 102 to 9% or more and 26% or less of the length of the deformation portion 70 in the long axis direction, it is ensured In a state of operability, the deformable portion 70 is easily bent on the back side and the front side.

於變形部70中寬度方向的一側（圖1中為上側）的側緣的軟質部70E露出並設置有波紋部103。於變形部70中寬度方向的另一側（圖1中為下側）的側緣的軟質部70E露出並設置有波紋部104。The soft portion 70E at the side edge of one side (upper side in FIG. 1) in the width direction of the deformed portion 70 is exposed and provided with a corrugated portion 103. The soft portion 70E at the side edge of the deformed portion 70 on the other side in the width direction (the lower side in FIG. 1) is exposed and provided with the corrugated portion 104.

如圖4所示，波紋部103、波紋部104分別具有在與長軸方向交叉的方向上延長、且在所述長軸方向上互相相鄰而配置多個的凹部113與凸部114（圖4中僅圖示有波紋部103）。本實施方式中凹部113與凸部114於厚度方向延長。即，凹部113為於厚度方向延長的溝狀。凸部114為於厚度方向延長的突起。如圖1所示，在正面視中，凹部113為向寬度方向中心側凹陷的圓弧形狀。在正面視中，凸部114為向寬度方向外側突出的圓弧形狀。As shown in FIG. 4, the corrugated portion 103 and the corrugated portion 104 each have a plurality of concave portions 113 and convex portions 114 that extend in a direction crossing the long axis direction and are arranged adjacent to each other in the long axis direction (Figure In 4, only the corrugated part 103 is shown). In this embodiment, the concave portion 113 and the convex portion 114 extend in the thickness direction. That is, the recessed portion 113 has a groove shape extending in the thickness direction. The convex portion 114 is a protrusion extending in the thickness direction. As shown in FIG. 1, in a front view, the concave portion 113 has a circular arc shape recessed toward the center side in the width direction. In a front view, the convex portion 114 has an arc shape protruding outward in the width direction.

藉由於長軸方向設置多個形成於變形部70的寬度方向兩側、在厚度方向延長的薄壁部的凹部113，變形部70於厚度方向彎曲時的阻力變少，使變形部70變得容易於背面側及正面側彎曲。因此，長軸方向的凹部113的位置較佳為設為與波紋部103、波紋部104中的凹部彼此相同。Since the long axis direction is provided with a plurality of recesses 113 formed on both sides of the deformed portion 70 in the width direction and elongated in the thickness direction, the resistance when the deformed portion 70 is bent in the thickness direction is reduced, and the deformed portion 70 becomes Easy to bend on the back side and the front side. Therefore, the position of the recess 113 in the long axis direction is preferably set to be the same as the recesses in the corrugated part 103 and the corrugated part 104.

相對於凸部114的凹部111的深度（自凸部114的頂點位置到凹部113的最凹陷的位置為止的厚度方向的距離）相對於變形部70的最大寬度較佳為2%以上、20%以下。於凹部113的深度相對於變形部70的最大寬度未滿2%的情況下，變形部70於厚度方向彎曲時的阻力的減少變小，具有不有效地顯現變形部70的厚度方向的彎曲的可能性。若凹部113的深度相對於變形部70的最大寬度超過20%，則有握持部30容易彎曲而操作性受損的可能性。因此，藉由將凹部113的深度相對於變形部70的最大寬度設為2%以上、20%以下，在確保操作性的狀態下，使變形部70變得容易於背面側及正面側彎曲。The depth of the concave portion 111 relative to the convex portion 114 (the distance in the thickness direction from the vertex position of the convex portion 114 to the most concave position of the concave portion 113) relative to the maximum width of the deformed portion 70 is preferably 2% or more and 20% the following. When the depth of the recessed portion 113 is less than 2% of the maximum width of the deformed portion 70, the reduction in resistance when the deformed portion 70 is bent in the thickness direction becomes small, and the bending of the deformed portion 70 in the thickness direction is not effectively displayed. possibility. If the depth of the concave portion 113 exceeds 20% with respect to the maximum width of the deformed portion 70, the grip portion 30 may be easily bent and the operability may be impaired. Therefore, by setting the depth of the concave portion 113 to 2% or more and 20% or less with respect to the maximum width of the deformable portion 70, the deformable portion 70 can be easily bent on the back side and the front side while ensuring operability.

波紋部103中凹部113的深度與波紋部104中凹部113的深度可不同，自將寬度方向的一側與另一側的操作性及向寬度方向的彎曲特性設為相同的觀點，凹部113的深度較佳為相同。The depth of the concave portion 113 in the corrugated portion 103 and the depth of the concave portion 113 in the corrugated portion 104 may be different. The depth is preferably the same.

配置於厚度方向的波紋部101、波紋部102中的凹部111的深度與配置於寬度方向的波紋部103、波紋部104中的凹部113的深度可為相同，但自設為容易於厚度方向彎曲的觀點，凹部111較佳為深於凹部113。The depth of the concave portion 111 in the corrugated portion 101 and the corrugated portion 102 arranged in the thickness direction may be the same as the depth of the concave portion 113 in the corrugated portion 103 and the corrugated portion 104 arranged in the width direction, but it is set to be easy to bend in the thickness direction. From the viewpoint of, the concave portion 111 is preferably deeper than the concave portion 113.

由於於變形部70的周圍在長軸方向上空出間隔（凹部111、凹部113）而設置有凸部112、凸部114，所以於握住變形部70時的握緊性提升。Since the protrusion 112 and the protrusion 114 are provided around the deformed part 70 with spaces (concave parts 111 and recessed parts 113) in the longitudinal direction, the grip when holding the deformed part 70 is improved.

並不限定凹部111及凸部112延伸的方向與凹部111及凸部112並排的長軸方向為正交的平面波紋結構作為波紋部101、波紋部102。在凹部111及凸部112延伸的方向與並排的方向的交叉角度為90度以外的情況下，亦可採用鳶尾波紋結構，所述鳶尾波紋結構設置有凹部111及凸部112延伸的方向與長軸方向呈第一角度交叉且並排於長軸方向的第一波紋群、與凹部111及凸部112延伸的方向與長軸方向呈第二角度交叉且並排於長軸方向的第二波紋群，其中所述第二角度以長軸方向為中心而與第一角度成為線對稱。在採用第一角度與第二角度以長軸方向為中心而成為線對稱的鳶尾波紋結構的情況下，當以凹部111作為中心而變形部70向背面側及正面側彎曲時，第一波紋群與第二波紋群的阻力變為同樣，可抑制變形部70向與厚度方向交叉的方向彎曲。針對波紋部103、波紋部104亦可同樣地採用鳶尾波紋結構。The corrugated portion 101 and the corrugated portion 102 are not limited to a flat corrugated structure in which the extending direction of the concave portion 111 and the convex portion 112 is orthogonal to the long axis direction of the parallel of the concave portion 111 and the convex portion 112. In the case where the crossing angle between the extending direction of the concave portion 111 and the convex portion 112 and the side-by-side direction is other than 90 degrees, an iris wave structure can also be used. The iris wave structure is provided with the extending direction and length of the concave portion 111 and the convex portion 112. A first corrugation group whose axial direction crosses at a first angle and is arranged in the long axis direction, and a second corrugation group which crosses the direction in which the concave portion 111 and the convex portion 112 extend at a second angle to the long axis direction and is arranged in the long axis direction, The second angle is line-symmetric with the first angle centered on the long axis direction. In the case of adopting the iris wave structure in which the first angle and the second angle are line-symmetric with the long axis direction as the center, when the deformed portion 70 is bent to the back side and the front side with the concave portion 111 as the center, the first wave group As with the resistance of the second wave group, it is possible to suppress the deformation of the deformed portion 70 in a direction crossing the thickness direction. The corrugated part 103 and the corrugated part 104 can also adopt the iris corrugated structure in the same way.

另外，凹部111、凹部113及凸部112、凸部114的剖面形狀並不限定於圓弧形狀，例如可為矩形狀、V字狀等。於凹部111、凹部113的剖面形狀中包含角部的情況下，具有所述角部應力集中的可能性，因此凹部111、凹部113的剖面形狀較佳為圓弧形狀。In addition, the cross-sectional shape of the concave portion 111, the concave portion 113, the convex portion 112, and the convex portion 114 is not limited to the arc shape, and may be, for example, a rectangular shape, a V-shape, or the like. When corners are included in the cross-sectional shape of the recessed portion 111 and the recessed portion 113, there is a possibility of stress concentration at the corners. Therefore, the cross-sectional shape of the recessed portion 111 and the recessed portion 113 is preferably an arc shape.

圖5是變形部70中的硬質部70H周邊的部分的正面圖。圖6是變形部70中的硬質部70H周邊的部分的側面圖。 如圖5所示，硬質部70H形成為將於長軸方向為頸部20的硬質部20H、及於握持部中較變形部70更靠後端側的硬質部30H進行連接的平面矩形狀。硬質部70H的寬度形成為較硬質部20H的寬度及硬質部30H的寬度更小。FIG. 5 is a front view of the part around the hard portion 70H in the deformed portion 70. FIG. 6 is a side view of the part around the hard portion 70H in the deformed portion 70. As shown in FIG. 5, the hard portion 70H is formed in a planar rectangular shape that connects the hard portion 20H whose long axis direction is the neck portion 20 and the hard portion 30H on the rear end side of the deformed portion 70 in the grip portion. . The width of the hard portion 70H is formed to be smaller than the width of the hard portion 20H and the width of the hard portion 30H.

與硬質部70H連接的硬質部20H構成第一區域P1，所述第一區域P1的寬度、厚度及厚度方向的彎曲強度大於硬質部70H且更剛直。與硬質部70H連接的硬質部30H構成第二區域P2，所述第二區域P2的寬度、厚度及厚度方向的彎曲強度大於硬質部70H且更剛直。第一區域P1及第二區域P2於各自與長軸方向正交的剖面中，硬質樹脂所佔的比例大於軟質樹脂。於牙刷1中，在握住握持部30的狀態下對刷頭部10施加向背面側的外力時，變形部70的前端側的第一區域P1及後端側的第二區域P2，由於彎曲強度較硬質部70H更大且更剛直，因此成為非變形，配置於第一區域P1及第二區域P2之間的變形部70於背面側變形。The hard portion 20H connected to the hard portion 70H constitutes a first region P1 whose width, thickness, and bending strength in the thickness direction are greater than that of the hard portion 70H and more rigid. The hard portion 30H connected to the hard portion 70H constitutes a second region P2 whose width, thickness, and bending strength in the thickness direction are greater than and more rigid than the hard portion 70H. In the first region P1 and the second region P2, each of the cross-sections orthogonal to the long axis direction has a larger proportion of the hard resin than the soft resin. In the toothbrush 1, when an external force is applied to the back side of the brush head 10 while holding the grip portion 30, the first area P1 on the front end side and the second area P2 on the rear end side of the deforming portion 70 are due to The bending strength is greater than that of the hard portion 70H and more rigid, so it becomes non-deformable, and the deformable portion 70 arranged between the first region P1 and the second region P2 deforms on the back side.

如圖6所示，於硬質部70H的正面側的前端側，在側視下由圓弧狀的曲面73H與硬質部20H（第一區域P1）連接。於硬質部70H的正面側的後端側，在側視下由圓弧狀的曲面74H與硬質部30H（第二區域P1）連接。曲面73H、曲面74H的圓弧中心在側視下位於較硬質部更靠正面側。於硬質部70H的背面側的前端側，在側視下由圓弧狀的曲面75H與硬質部20H連接。於硬質部70H的背面側的後端側，在側視下由圓弧狀的曲面76H與硬質部30H連接。曲面75H、曲面76H的圓弧中心在側視下位於較硬質部更靠背面側。在不存在曲面73H～曲面76H的情況下，具有在硬質部70H的前端側與硬質部20H的邊界，及在硬質部70H的後端側與硬質部30H的邊界上應力集中的可能性。相對於此，藉由存在曲面73H～曲面76H，集中的應力被緩和。As shown in FIG. 6, the front end side of the hard portion 70H is connected to the hard portion 20H (first region P1) by an arc-shaped curved surface 73H in a side view. The hard portion 70H is connected to the hard portion 30H (second region P1) by an arc-shaped curved surface 74H on the rear end side on the front side of the hard portion 70H in a side view. The arc centers of the curved surface 73H and the curved surface 74H are located closer to the front side of the hard part when viewed from the side. The hard portion 70H is connected to the hard portion 20H by an arc-shaped curved surface 75H on the front end side on the back side of the hard portion 70H in a side view. The hard portion 70H is connected to the hard portion 30H by an arc-shaped curved surface 76H on the rear end side on the back side of the hard portion 70H in a side view. The arc centers of the curved surface 75H and the curved surface 76H are located closer to the back side of the hard part in a side view. When there are no curved surfaces 73H to 76H, there is a possibility of stress concentration at the boundary between the front end side of the hard section 70H and the hard section 20H, and at the boundary between the rear end side of the hard section 70H and the hard section 30H. In contrast, the presence of the curved surface 73H to the curved surface 76H reduces the concentrated stress.

作為硬質部70H的厚度（最小厚度）較佳為0.5 mm以上、2.0 mm以下。於硬質部70H的厚度未滿0.5 mm的情況下，對刷頭部10施加向背面側的外力時的變形部70的變形變大，有刷牙時的操作性下降的可能性。於硬質部70H的厚度超過2.0 mm的情況下，對刷頭部10施加向背面側的外力時變得難以彎曲。另外，於施加外力時將硬質部70H設為平面應力狀態變得困難，有耐久性下降的可能性。因此，藉由將硬質部70H的厚度設為0.5 mm以上、2.0 mm以下，可一邊維持刷牙時的操作性，一邊將硬質部70H設為平面應力狀態。The thickness (minimum thickness) of the hard portion 70H is preferably 0.5 mm or more and 2.0 mm or less. When the thickness of the hard portion 70H is less than 0.5 mm, the deformation of the deformable portion 70 when an external force is applied to the back side of the brush head portion 10 becomes large, and there is a possibility that the operability at the time of brushing decreases. When the thickness of the hard portion 70H exceeds 2.0 mm, it becomes difficult to bend when an external force is applied to the back side of the brush head portion 10. In addition, it becomes difficult to bring the hard portion 70H into a plane stress state when an external force is applied, and there is a possibility that durability may be reduced. Therefore, by setting the thickness of the hard portion 70H to 0.5 mm or more and 2.0 mm or less, the hard portion 70H can be brought into a plane stress state while maintaining the operability during tooth brushing.

作為硬質部H的原材料，可列舉彎曲彈性係數（日本工業標準（Japanese Industrial Standards，JIS）7171）為1500 MPa以上、3500 MPa以下的硬質樹脂作為一例，例如可列舉聚縮醛樹脂（Polyoxymethylene，POM）。作為硬質部H的彎曲彈性係數更佳為2000 MPa以上、3500 MPa以下。As a raw material of the hard part H, a hard resin having a bending elastic modulus (Japanese Industrial Standards (JIS) 7171) of 1500 MPa or more and 3500 MPa or less can be cited as an example. For example, polyoxymethylene (POM) resin can be cited. ). The bending elastic modulus of the hard part H is more preferably 2000 MPa or more and 3500 MPa or less.

作為軟質部E的原材料，自即使刷牙負荷增加，牙齒等上的負荷亦落在適當的範圍內的觀點，作為一例，較佳為蕭氏硬度A為50以上、90以下者，更佳為蕭氏硬度A為60以上、80以下者。於蕭氏硬度A未滿50的情況下，有於寬度方向彎曲變得容易的可能性。作為軟質樹脂，例如可列舉彈性體（例如烯烴系彈性體、苯乙烯系彈性體、聚酯系彈性體、聚胺基甲酸酯系熱塑性彈性體等）、矽酮。由於與聚縮醛樹脂的混合性優異，因此較佳為苯乙烯系彈性體。As the raw material of the soft part E, from the viewpoint that the load on the teeth etc. falls within an appropriate range even if the tooth brushing load increases, as an example, those having a Shore hardness A of 50 or more and 90 or less are preferable, and more preferably Xiao The hardness A is 60 or more and 80 or less. When the Shore hardness A is less than 50, there is a possibility that bending in the width direction becomes easy. Examples of soft resins include elastomers (for example, olefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based thermoplastic elastomers, etc.) and silicones. Since it has excellent miscibility with polyacetal resin, it is preferably a styrene-based elastomer.

作為牙刷1中過度刷牙的對策，有效的是確保柔軟的彎曲行為，且使刷牙負荷緩和。因此，於牙刷1的厚度方向的彎曲行為中，尋求即使於刷牙壓力激烈地上升時，亦盡可能地以設定的壓力對牙齒等施加負荷。但是，若在刷牙時除了在厚度方向上，在寬度方向上亦賦予柔軟性，則本來應施加在牙齒上的壓力會分散，這導致清潔力下降。另外，於刷頭部在各種方向上彎曲的情況下，難以將刷頭部10抵接至目標部位，而有導致操作性下降的可能性。As a countermeasure for excessive brushing in the toothbrush 1, it is effective to ensure a soft bending behavior and to relax the tooth brushing load. Therefore, in the bending behavior of the toothbrush 1 in the thickness direction, it is required to apply a load to the teeth and the like with a set pressure as much as possible even when the tooth brushing pressure increases drastically. However, if softness is imparted in the width direction in addition to the thickness direction when brushing the teeth, the pressure that should be applied to the teeth will be dispersed, which leads to a decrease in cleaning power. In addition, in the case where the brush head portion is bent in various directions, it is difficult to abut the brush head portion 10 to the target part, which may cause a decrease in operability.

相對於此，於本實施方式的牙刷1中，設置有於彎曲強度上具有各向異性，在厚度方向上容易彎曲，在寬度方向上難以彎曲的所述變形部70，因此可以抑制所述清潔力的下降及操作性的下降。另外，在本實施方式的牙刷1中的變形部70，由於硬質部70H埋設於軟質部70E中，與變形部70僅由硬質部形成的狀況相比適當的彈性起作用，因此即使於刷牙壓力激烈地上升時，亦可以抑制對牙齒等的負荷。另外，與變形部70僅由軟質部形成的狀況相比，當釋放負荷時立刻回到原本的形狀，因此可對應刷頭部10的各種動作。In contrast, the toothbrush 1 of the present embodiment is provided with the deformed portion 70 that has anisotropy in bending strength, is easy to bend in the thickness direction, and is difficult to bend in the width direction, so that the cleaning can be suppressed. Decrease in power and operability. In addition, in the deformed portion 70 in the toothbrush 1 of the present embodiment, since the hard portion 70H is embedded in the soft portion 70E, it acts with appropriate elasticity compared to the situation in which the deformed portion 70 is formed only by the hard portion. Even when it rises violently, the load on teeth etc. can be suppressed. In addition, compared with a situation where the deformed portion 70 is formed only by a soft portion, it immediately returns to its original shape when the load is released, so that it can respond to various actions of the brush head portion 10.

如上所述，在本實施方式的牙刷1中，藉由將相對於由外形輪廓或外形輪廓的延長線所包圍的封閉空間的截面積，硬質部70H的截面積的佔有率遍及長軸方向設為35%以下，而容易彎曲，且因為在厚度方向的彎曲強度被規範為小於寬度方向的彎曲強度的變形部70中，設置有於正面側及背面側露出的波紋部101、波紋部102，因此可以保持所謂的一邊維持適當的刷牙壓力，一邊好好地對目標部位刷牙的良好的操作性。另外，在本實施方式的牙刷1中，由於於變形部70的寬度方向兩側設置有露出的波紋部103、波紋部104，因此可以使變形部70於厚度方向彎曲時的阻力減少，使變形部70變得更容易於厚度方向彎曲。As described above, in the toothbrush 1 of this embodiment, by setting the cross-sectional area of the hard portion 70H with respect to the cross-sectional area of the closed space enclosed by the outer contour or the extension line of the outer contour, the occupancy rate of the cross-sectional area of the hard portion 70H is set in the long axis direction. It is 35% or less, which is easy to bend, and because the bending strength in the thickness direction is regulated to be smaller than the bending strength in the width direction, the deformed portion 70 is provided with corrugated portions 101 and 102 exposed on the front and back sides, Therefore, it is possible to maintain the so-called good operability of brushing the target part while maintaining an appropriate brushing pressure. In addition, in the toothbrush 1 of the present embodiment, since the corrugated portions 103 and the corrugated portions 104 are exposed on both sides of the deformed portion 70 in the width direction, the resistance when the deformed portion 70 is bent in the thickness direction can be reduced, and the deformation can be reduced. The portion 70 becomes easier to bend in the thickness direction.

[第二實施方式] 接著，針對牙刷1的第二實施方式，參照圖7至圖12進行說明。 該些圖中，針對與於圖1至圖6中所示的第一實施方式的構成要素相同的要素，賦予同樣的符號，並省略其說明。[Second Embodiment] Next, the second embodiment of the toothbrush 1 will be described with reference to FIGS. 7 to 12. In these figures, the same elements as those of the first embodiment shown in FIGS. 1 to 6 are given the same reference numerals, and their description is omitted.

圖7是第二實施方式的牙刷1的正面圖。圖8是以包含寬度方向（圖7的上下方向）的中心的平面切斷所述牙刷1的剖面圖。Fig. 7 is a front view of the toothbrush 1 of the second embodiment. FIG. 8 is a cross-sectional view of the toothbrush 1 cut through a plane including the center in the width direction (the vertical direction in FIG. 7 ).

如圖7及圖8所示，本實施方式中的牙刷1的變形部70具有反轉部80與彈性變形部90。圖9是在變形部70中於長軸方向中央與長軸方向正交的剖面圖，為圖7中於B-B線觀察的剖面圖。圖10是以包含寬度方向的中心的平面切斷變形部70的剖面圖。As shown in FIGS. 7 and 8, the deformed portion 70 of the toothbrush 1 in this embodiment has an inverted portion 80 and an elastic deformed portion 90. 9 is a cross-sectional view perpendicular to the long axis direction in the center of the long axis direction in the deformed portion 70, and is a cross-sectional view viewed on the line B-B in FIG. 7. FIG. 10 is a cross-sectional view of the deformed portion 70 cut in a plane including the center in the width direction.

反轉部80及彈性變形部90分別連接比變形部70更靠前端側的頸部（第一區域）20與比變形部70更靠後端側的握持部（第二區域）30。如圖9所示，於反轉部80的寬度方向兩側空出間隙S而分別設置有彈性變形部90。間隙S由貫穿厚度方向的貫穿孔K形成。如圖7所示，貫穿孔K形成為於長軸方向延伸的平視矩形狀。即，變形部90經由貫穿孔K於寬度方向分支，分支的變形部70分別形成彈性變形部90。The inversion portion 80 and the elastic deformation portion 90 respectively connect the neck portion (first region) 20 on the front end side than the deformation portion 70 and the grip portion (second region) 30 on the rear end side than the deformation portion 70. As shown in FIG. 9, gaps S are provided on both sides of the inversion portion 80 in the width direction, and elastic deformation portions 90 are respectively provided. The gap S is formed by a through hole K penetrating through the thickness direction. As shown in FIG. 7, the through hole K is formed in a rectangular shape in plan view extending in the long axis direction. That is, the deformed portion 90 is branched in the width direction via the through hole K, and the branched deformed portions 70 respectively form the elastic deformable portion 90.

藉由設置間隙S，反轉部80可以反轉（反轉變得容易）而不會干擾周圍的結構。另外，因為彈性變形部90與反轉部80不互相干擾，反轉部80的變形不會追隨彈性變形部90的變形，因此可以使反轉部80與彈性變形部90的功能上的角色（後述）獨立。 藉此，例如可以提高用於獲得以下的效果的設計的自由度。例如，可以使後述的反轉部80在反轉時的振動、聲音清楚地產生。另外，例如可以使外力的大小直到閾值為止的反轉部80的反彈力與位移量成比例地上升，尤其是即使在閾值附近，亦可以保持所述比例關係（反轉部80的反彈力的上升程度不會變緩）。藉此，在直至達到上限的壓力（刷牙壓力）的位移量的區域中，由於使用者所設定的壓力直接反映在反轉部80的反彈力上，因此可以適當地控制刷牙負荷。若是為在外力的大小到達閾值的附近時反彈力的上升程度徐徐地變緩和的設定的情況，則有使用者無意地繼續以上限附近的壓力進行刷牙的可能性。另外，若是間隙S與反轉部80的厚度方向兩側連通，則所述效果進一步提高。 進而，藉由將間隙S於厚度方向變寬，在刷牙時施加於刷毛部（刷毛）的負荷的向量與間隙的開口方向，進而反轉部80與彈性變形部90變形的方向變為平行（參照圖9），且使由於反轉而產生的振動、聲音容易與刷牙負荷產生連動。By providing the gap S, the reversing part 80 can be reversed (reversing becomes easy) without disturbing the surrounding structure. In addition, since the elastic deformation portion 90 and the reversing portion 80 do not interfere with each other, the deformation of the reversing portion 80 does not follow the deformation of the elastic deformation portion 90, so the functional roles of the reversing portion 80 and the elastic deformation portion 90 can be made ( (Described later) Independent. Thereby, for example, the degree of freedom of design for obtaining the following effects can be improved. For example, it is possible to make the vibration and sound of the reversing part 80 described later clearly generated during reversal. In addition, for example, the rebound force of the reversing part 80 up to the threshold value can be increased in proportion to the displacement amount. In particular, even near the threshold value, the proportional relationship can be maintained (the ratio of the rebound force of the reversing part 80 The degree of ascent will not slow down). Thereby, in the region of the displacement amount of the pressure (brushing pressure) up to the upper limit, the pressure set by the user is directly reflected on the repulsive force of the reversing portion 80, so that the brushing load can be appropriately controlled. If the setting is such that when the magnitude of the external force reaches the vicinity of the threshold value, the degree of increase in the rebound force is gradually reduced, there is a possibility that the user may unintentionally continue brushing with a pressure near the upper limit. In addition, if the gap S communicates with both sides in the thickness direction of the reversing portion 80, the effect is further improved. Furthermore, by widening the gap S in the thickness direction, the vector of the load applied to the bristle portion (bristles) during brushing and the opening direction of the gap, and the direction in which the inversion portion 80 and the elastic deformation portion 90 deform become parallel ( Refer to Figure 9), and the vibration and sound due to the reversal are easily linked to the tooth brushing load.

另外，若藉由貫穿孔K使間隙S貫穿前端與後端側，則例如可以進一步擴大彈性變形部90的可動區域，所述彈性變形部90承擔相對刷牙時的負荷而使牙刷骨架彎曲的功能（難以阻礙伴隨彎曲引起的在表面上的拉伸行為與在背面上的壓縮行為）。在彈性變形部90與反轉部80之間不存在貫穿孔K的情況下，彈性變形部90的可動區域變得狹窄。在所述情況下，假設有下述情形：反轉部80並未被給予適當的負荷範圍下的反轉時機，而在達到適當的負荷範圍之前，反轉部80就進行反轉、或者即使在適當的負荷範圍下也未進行反轉。相對於此，藉由在彈性變形部90與反轉部80之間設置貫穿孔K，可以將後述的反轉部80的反轉閾值控制於較細的範圍。 另外，間隙S亦可不於厚度方向上貫穿，例如可以由在彈性變形部90的內部沿所述長軸方向延伸的封閉空腔形成。另外，亦可以由向正面側或背面側開口的凹處（後述）形成。In addition, if the gap S is penetrated through the front end and the rear end by the through hole K, for example, the movable area of the elastic deformation portion 90 can be further enlarged, and the elastic deformation portion 90 bears the function of bending the toothbrush frame with respect to the load during brushing. (It is difficult to hinder the tensile behavior on the surface and the compressive behavior on the back surface caused by bending). When there is no through hole K between the elastic deformation portion 90 and the reversal portion 80, the movable area of the elastic deformation portion 90 becomes narrow. In this case, suppose there is a situation in which the reversing part 80 is not given a reversal timing under an appropriate load range, and the reversing part 80 reverses before reaching the appropriate load range, or even if In the appropriate load range, the reverse is not performed. In contrast, by providing the through hole K between the elastic deformation portion 90 and the reversing portion 80, the reversal threshold value of the reversing portion 80 described later can be controlled to a narrow range. In addition, the gap S may not penetrate in the thickness direction. For example, it may be formed by a closed cavity extending in the longitudinal direction of the elastic deformation portion 90. In addition, it may be formed by a recess (described later) that opens to the front side or the back side.

各彈性變形部90具有硬質部（芯部）90H與軟質部（覆蓋部）90E。如圖7所示，軟質部90E連接頸部20的後端與較變形部70更後端側的握持部30。如圖9及圖10所示，一對彈性變形部90之間設置有向正面側開口的凹處（凹部）71與向背面側開口的凹處（凹部）72。於凹處71及凹處72的寬度方向兩端側的底部分別與貫穿孔K連接。於凹處71及凹處72的寬度方向中央的底部露出並設置有反轉部80。藉由設置凹處71及凹處72，例如可進一步擴大承擔相對刷牙時的負荷而使牙刷骨架彎曲的功能的彈性變形部90的可動區域，且使向厚度方向的彎曲各向異性提高。再者，一對彈性變形部90間的所述凹處亦可不於厚度方向上貫穿，可僅向厚度方向的一邊開口。另外，例如可以形成在彈性變形部90的內部沿長軸方向延伸的封閉空腔，將所述空腔夾在中央，於寬度方向上形成一對彈性變形部90。Each elastic deformation part 90 has a hard part (core part) 90H and a soft part (covering part) 90E. As shown in FIG. 7, the soft portion 90E connects the rear end of the neck portion 20 and the grip portion 30 on the rear end side of the deformed portion 70. As shown in FIGS. 9 and 10, a recess (recess) 71 that opens to the front side and a recess (recess) 72 that opens to the back side are provided between the pair of elastic deformation portions 90. The bottoms at both ends in the width direction of the recess 71 and the recess 72 are connected to the through holes K, respectively. A reversing part 80 is exposed at the bottom of the center in the width direction of the recess 71 and the recess 72. By providing the recess 71 and the recess 72, for example, the movable area of the elastic deformation part 90 which bears the load during brushing and the function of bending the toothbrush frame can be further expanded, and the bending anisotropy in the thickness direction can be improved. Furthermore, the recesses between the pair of elastic deformation portions 90 may not penetrate in the thickness direction, and may be opened to only one side in the thickness direction. In addition, for example, a closed cavity extending in the longitudinal direction of the elastic deformation portion 90 may be formed, and the cavity may be sandwiched in the center to form a pair of elastic deformation portions 90 in the width direction.

一對彈性變形部90在正面側及背面側的兩者中，軟質部90E的長軸方向的端部彼此於寬度方向上連接。在正視中，於橢圓狀的凹處71、凹處72的周圍設置有一對彈性變形部90的軟質部90E。軟質部90E的後端側與握持部30的軟質部31E連接。藉由軟質部90E在彈性變形部90的前端側及後端側的兩者於寬度方向上連接，即使重複反轉，應力亦難以集中於鉸鏈結構的末端，且亦難以折斷。另外，藉由軟質部90E在彈性變形部90的前端側及後端側的兩者於寬度方向上連接，變形部70的各向異性提高，相對於刷牙時的動作，一對彈性變形部90可以於厚度方向上不扭轉地彎曲。進而，藉由軟質部90E於寬度方向上連接，在射出成形時軟質樹脂（彈性體）所具有的熱量增加，因此頸部20與變形部70間的接著性（頸部20與彈性變形部90間的接著性）提高。In the pair of elastic deformation portions 90 on both the front side and the back side, the ends of the soft portion 90E in the long axis direction are connected to each other in the width direction. In front view, a pair of soft parts 90E of elastic deformation parts 90 are provided around the elliptical recess 71 and the recess 72. The rear end side of the soft portion 90E is connected to the soft portion 31E of the grip portion 30. Since the soft portion 90E is connected in the width direction on both the front end side and the rear end side of the elastic deformation portion 90, even if the reversal is repeated, the stress is hard to concentrate on the end of the hinge structure, and it is hard to break. In addition, since the soft portion 90E is connected to both the front end side and the rear end side of the elastic deformation portion 90 in the width direction, the anisotropy of the deformation portion 70 is improved, and a pair of elastic deformation portions 90 are compared to the action when brushing teeth. It can be bent without twisting in the thickness direction. Furthermore, since the soft portion 90E is connected in the width direction, the heat of the soft resin (elastic body) during injection molding increases, so the adhesion between the neck portion 20 and the deformed portion 70 (the neck portion 20 and the elastic deformation portion 90 Adhesion between) improves.

如圖9所示，在變形部70的外形輪廓未形成封閉空間的情況下，由包含以兩點虛線所示的正面側的外形輪廓的延長線及以兩點虛線所示的背面側的外形輪廓的延長線的外型輪廓所包圍的封閉空間的面積是變形部70的截面積。As shown in FIG. 9, when the outer contour of the deformed portion 70 does not form a closed space, an extension line including the outer contour of the front side shown by the two-dot dashed line and the outer contour of the back side shown by the two-dot dashed line The area of the closed space surrounded by the outer contour of the extension line of the contour is the cross-sectional area of the deformed portion 70.

圖11是變形部70中的硬質部70H周邊的部分的正面圖。 如圖11所示，硬質部70H具有設置於反轉部80的寬度方向兩側上的貫穿孔73。貫穿孔73分別於長軸方向上延伸。貫穿孔73於長軸方向上的長度是分別與硬質部20H、硬質部30H的端部分開的長度。如圖9所示，在貫穿孔73中，在寬度方向上的硬質部90H的附近設置有軟質部90E，在寬度方向上的反轉部80的附近形成有貫穿孔K。在硬質部70H中，由於硬質部90H經由貫穿孔73以反轉部80作為中心於寬度方向的兩側配置，因此即使施加負荷且彈性變形部90變形，亦可以保持反轉部80的形狀。當在牙刷1的整個長度上構成的硬質部H彎曲時，變形部70的反轉部80反轉以試圖釋放儲存的應變能。例如，在僅藉由反轉部80將硬質部70H連接至頸部20和握持部30的情況下，由於無法儲存能量，因此立即反轉。若所述反轉部80與後述的第一部分A1及第二部分A2，進而頸部20與握持部30以及硬質部70H一體地射出成型，可有效率地傳輸儲存的應變能至反轉部80。FIG. 11 is a front view of the portion around the hard portion 70H in the deformed portion 70. As shown in FIG. 11, the hard portion 70H has through holes 73 provided on both sides of the inversion portion 80 in the width direction. The through holes 73 respectively extend in the long axis direction. The length of the through hole 73 in the major axis direction is the length separated from the end portions of the hard portion 20H and the hard portion 30H, respectively. As shown in FIG. 9, in the through hole 73, a soft part 90E is provided in the vicinity of the hard part 90H in the width direction, and a through hole K is formed in the vicinity of the inversion part 80 in the width direction. In the hard portion 70H, since the hard portion 90H is arranged on both sides in the width direction with the inverted portion 80 as the center through the through hole 73, the shape of the inverted portion 80 can be maintained even if a load is applied and the elastic deformable portion 90 is deformed. When the hard part H constructed over the entire length of the toothbrush 1 is bent, the inverted part 80 of the deformed part 70 is reversed to try to release the stored strain energy. For example, in the case where the hard part 70H is connected to the neck 20 and the grip part 30 only by the reversing part 80, since energy cannot be stored, it is immediately reversed. If the reversing part 80 and the first part A1 and the second part A2 described later, and the neck 20, the grip part 30 and the hard part 70H are integrally injection molded, the stored strain energy can be efficiently transferred to the reversing part 80.

硬質部90H形成於硬質部70H中較貫穿孔73更靠寬度方向外側。如圖9所示，硬質部90H為長邊在寬度方向上延伸的大致矩形的剖面形狀。硬質部90H以周圍被覆蓋的狀態埋設於軟質部90E。由於硬質部90H被埋設於軟質部90E中，因此自強度的觀點，可以緩和施加到硬質部90H的應力。另外，自牙刷1相對於負荷的彎曲程度的觀點，可控制彈性變形部90的彈性行為。另外，藉由將硬質部90H埋設於軟質部90E中，變形部70中的彎曲各向異性提高，例如相對於刷牙時的動作，可在厚度方向上不扭轉地使彈性變形部90彎曲。The hard portion 90H is formed on the outer side in the width direction of the through hole 73 in the hard portion 70H. As shown in FIG. 9, the hard portion 90H has a substantially rectangular cross-sectional shape with long sides extending in the width direction. The hard portion 90H is buried in the soft portion 90E in a state where the surroundings are covered. Since the hard portion 90H is embedded in the soft portion 90E, the stress applied to the hard portion 90H can be alleviated from the viewpoint of strength. In addition, from the viewpoint of the degree of bending of the toothbrush 1 with respect to the load, the elastic behavior of the elastic deformation portion 90 can be controlled. In addition, by embedding the hard portion 90H in the soft portion 90E, the bending anisotropy in the deforming portion 70 is improved, and for example, the elastic deforming portion 90 can be bent in the thickness direction without twisting in the thickness direction relative to the action during tooth brushing.

一對硬質部90H於厚度方向上配置在相同位置。藉由將一對硬質部90H於厚度方向上配置在相同位置，變形部70中的各向異性增大，且相對於刷牙時的動作，一對彈性變形部90於厚度方向上可不扭轉地彎曲。另外，作為硬質部90H的厚度方向的位置，較佳為較彈性變形部90的厚度成為一半的位置更靠背面側。藉由位於較彈性變形部90的厚度成為一半的位置更靠背面側，可以確保當釋放負荷時立即回到初始形狀的行為的同時，擔保對厚度方向的彎曲容易度。作為硬質部90H的寬度，較佳為2.0 mm以上。藉由將硬質部90H的寬度設為2.0 mm以上，可以抑制在寬度方向上的彎曲。硬質部90H的厚度較佳為2.0 mm以下。藉由將硬質部90H的厚度設為2.0 mm以下，容易在厚度方向上反覆彎曲。自彈性變形部90在寬度方向上比在厚度方向上更不易彎曲的觀點，硬質部90H的寬度較佳為大於硬質部90H的厚度。The pair of hard parts 90H are arranged at the same position in the thickness direction. By arranging the pair of hard portions 90H at the same position in the thickness direction, the anisotropy in the deformed portion 70 is increased, and the pair of elastic deformable portions 90 can be bent in the thickness direction without twisting relative to the action when brushing teeth . In addition, as a position in the thickness direction of the hard portion 90H, it is preferable to be closer to the back side than the position where the thickness of the elastic deformation portion 90 is half. By being located closer to the back side than the position where the thickness of the elastic deformation portion 90 is half the thickness, it is possible to ensure the behavior of returning to the original shape immediately when the load is released, while ensuring the ease of bending in the thickness direction. The width of the hard portion 90H is preferably 2.0 mm or more. By setting the width of the hard portion 90H to be 2.0 mm or more, bending in the width direction can be suppressed. The thickness of the hard portion 90H is preferably 2.0 mm or less. By setting the thickness of the hard portion 90H to 2.0 mm or less, it is easy to bend repeatedly in the thickness direction. From the viewpoint that the elastically deformable portion 90 is less flexible in the width direction than in the thickness direction, the width of the hard portion 90H is preferably greater than the thickness of the hard portion 90H.

進而，在硬質部90H中，藉由存在曲面73H〜曲面76H，彈性變形部90、以及反轉部80的前端側及後端側的兩者具有柔軟性而可變形（可以更精細地感測成為反轉契機的彈性變形部90的變形程度）。Furthermore, in the hard portion 90H, by the presence of curved surfaces 73H to 76H, the elastic deformation portion 90 and both the front end side and the rear end side of the reversing portion 80 are flexible and deformable (more finely sensed The degree of deformation of the elastic deformation portion 90 that is an opportunity for reversal).

硬質部90H與變形部70的寬度方向外側輪廓間的最小距離，即，比硬質部90H更靠寬度方向外側的軟質部90E的最小厚度（壁厚）較佳為1.0 mm以下。藉由將所述軟質部90E的最小厚度設為1.0 mm以下，可以抑制在寬度方向上的彎曲。The minimum distance between the hard portion 90H and the outer contour in the width direction of the deformed portion 70, that is, the minimum thickness (wall thickness) of the soft portion 90E on the outer side in the width direction than the hard portion 90H is preferably 1.0 mm or less. By setting the minimum thickness of the soft portion 90E to 1.0 mm or less, it is possible to suppress bending in the width direction.

藉由使用高彈性係數的原材料（例如POM）作為硬質部H的材料，即使形狀變細或變薄，當施加過剩的負荷時亦會發生跳躍屈曲而顯現出振動。另外，藉由使用高彈性係數的原材料，能夠在產生跳躍屈曲後迅速回到初期狀態（彈性變形部90的彎曲被解除的狀態）。By using a material with a high coefficient of elasticity (such as POM) as the material of the hard part H, even if the shape becomes thinner or thinner, jump buckling and vibration will occur when an excessive load is applied. In addition, by using a material with a high coefficient of elasticity, it is possible to quickly return to the initial state (a state where the bending of the elastic deformation portion 90 is released) after jumping buckling occurs.

自產生跳躍屈曲為止前，即使刷牙負荷增加，對牙齒等的負荷亦落在適當的範圍的觀點，作為軟質部E的原材料的一例，例如較佳為蕭氏硬度A為50以上、90以下者，更佳為蕭氏硬度A為60以上、80以下者。Before jumping flexion occurs, even if the brushing load increases, the load on the teeth falls within an appropriate range. As an example of the material of the soft part E, for example, it is preferable that the Shore hardness A is 50 or more and 90 or less , More preferably, the Shore hardness A is 60 or more and 80 or less.

本實施方式的牙刷1中的變形部70具有硬質部90H埋設於軟質部90E的彈性變形部90，與彈性變形部90僅由硬質部形成的狀況相比適當的彈性起作用，因此即使於刷牙壓力激烈地上升時，亦可以抑制對牙齒等的負荷。另外，與彈性變形部90僅由軟質部形成的狀況相比，當釋放負荷時立刻回到原本的形狀，可對應刷頭部10的各種動作。進而，在本實施方式中，由於一對彈性變形部90在寬度方向上並列配置，因此，相對於厚度方向的負荷，藉由抑制寬度方向的彎曲而能夠抑制因扭轉引起的彎曲，其結果，可以抑制所述清潔力的下降及操作性的下降。The deformable portion 70 in the toothbrush 1 of the present embodiment has an elastic deformable portion 90 in which the hard portion 90H is embedded in the soft portion 90E. Compared with the state where the elastic deformable portion 90 is formed only by the hard portion, the deformable portion 70 acts with appropriate elasticity. Even when the pressure increases drastically, the load on the teeth etc. can be suppressed. In addition, compared with a situation where the elastic deformation portion 90 is formed only by a soft portion, it immediately returns to its original shape when the load is released, and can respond to various actions of the brush head portion 10. Furthermore, in this embodiment, since the pair of elastic deformation portions 90 are arranged side by side in the width direction, it is possible to suppress bending due to torsion by suppressing the bending in the width direction with respect to the load in the thickness direction. As a result, The decrease in the cleaning power and the decrease in operability can be suppressed.

進而，在本實施方式中，由於一對彈性變形部90在寬度方向上並列配置，因此，相對於厚度方向的負荷，藉由抑制寬度方向的彎曲而能夠抑制因扭轉引起的彎曲，其結果，可以抑制所述清潔力的下降及操作性的下降。Furthermore, in this embodiment, since the pair of elastic deformation portions 90 are arranged side by side in the width direction, it is possible to suppress bending due to torsion by suppressing the bending in the width direction with respect to the load in the thickness direction. As a result, The decrease in the cleaning power and the decrease in operability can be suppressed.

如圖7所示，反轉部80於正視中為第二硬質部，所述第二硬質部於長軸方向上延伸，並且對在硬質部70H中較貫穿孔73更靠前端側的第一部分A1與較貫穿孔73更靠後端側的第二部分A2進行連接。反轉部80在未對刷頭部10施加向背面側的外力（或者，施加後述規定的閾值以下的外力）的如圖10所示的第一穩定狀態（以下稱為第一狀態）下，在側視中形成為隨著自長軸方向的兩端部朝向中央逐漸朝向背面傾斜的大致V字狀。即，在第一狀態下，反轉部80於長軸方向的中央成為頂點的背面側形成為凸狀。As shown in FIG. 7, the reversing portion 80 is a second hard portion in front view. The second hard portion extends in the long axis direction and opposes the first portion of the hard portion 70H on the front end side of the through hole 73. A1 is connected to the second portion A2 on the rear end side of the through hole 73. The reversing portion 80 is in the first stable state (hereinafter referred to as the first state) shown in FIG. 10 in which no external force is applied to the back side of the brush head portion 10 (or an external force below a predetermined threshold value described later) is applied, In a side view, it is formed in a substantially V-shape that gradually slopes toward the back from both ends in the long axis direction toward the center. That is, in the first state, the reverse portion 80 is formed in a convex shape on the back side where the apex is at the center in the longitudinal direction.

如圖9所示，在第一狀態下，反轉部80的一部分在寬度方向與硬質部90H重疊。另外，如圖12所示，即使在後述的第二狀態下，反轉部80的一部分亦在寬度方向上與硬質部90H重疊。在第一狀態和第二狀態兩者下，由於反轉部80的一部分在寬度方向上與硬質部90H重疊，因此變形部70的各向異性增大，且相對於刷牙時的動作，一對彈性變形部90可以於厚度方向上不扭轉地彎曲。As shown in FIG. 9, in the first state, a part of the inversion portion 80 overlaps the hard portion 90H in the width direction. In addition, as shown in FIG. 12, even in the second state described later, a part of the inverted portion 80 overlaps the hard portion 90H in the width direction. In both the first state and the second state, since a part of the inverted portion 80 overlaps the hard portion 90H in the width direction, the anisotropy of the deformed portion 70 is increased, and compared to the action during brushing, a pair of The elastic deformation portion 90 can be bent without twisting in the thickness direction.

在所述牙刷1中，當在握住握持部30的狀態下對刷頭部10施加向背面側的外力時，變形部70的前端側的第一區域P1及後端側的第二區域P2由於彎曲強度較硬質部70H更大且更剛直，因此成為非變形，配置於第一區域P1及第二區域P2之間的變形部70於背面側變形。In the toothbrush 1, when an external force is applied to the back side of the brush head 10 while holding the grip portion 30, the first region P1 on the front end side of the deformed portion 70 and the second region on the rear end side are Since P2 has a greater bending strength than the hard portion 70H and is more rigid, it is non-deformable, and the deformable portion 70 arranged between the first region P1 and the second region P2 deforms on the back side.

此時，在外力的大小為規定的閾值以下的情況，彈性變形部90及反轉部80根據外力的大小彈性變形。另外，此時波紋部101一邊於長軸方向延伸一邊於背面側彎曲。波紋部102一邊於長軸方向被壓縮一邊於背後側彎曲。波紋部101、波紋部102由於凹部111的存在在厚度方向上成為薄壁，且藉由在兩個分支部的表面及背面（正面側及背面側）於寬度方向上以相同的間距形成有凹凸。可以容易地不在厚度方向上扭轉地向背面側彎曲。另外，在波紋部103、波紋部104中，由於凹部111的存在在寬度方向上成為薄壁，因此變形部70在厚度方向上彎曲時的阻力減小，且使變形部70變得進一步容易向背面側彎曲。進而，藉由將表面及背面（正面側及背面側）的凹凸（凹部111及凸部112）延長到側面部的凹凸（凹部113及凸部114）並連接，可以相對於厚度方向更不扭轉地彎曲。At this time, when the magnitude of the external force is equal to or less than the predetermined threshold value, the elastic deformation portion 90 and the inversion portion 80 elastically deform in accordance with the magnitude of the external force. In addition, at this time, the corrugated portion 101 is bent on the back side while extending in the longitudinal direction. The corrugated portion 102 is bent on the back side while being compressed in the longitudinal direction. The corrugated portion 101 and the corrugated portion 102 become thin in the thickness direction due to the presence of the concave portion 111, and the surface and the back surface (front side and back side) of the two branch portions are formed with unevenness at the same pitch in the width direction. . It can be easily bent to the back side without twisting in the thickness direction. In addition, in the corrugated portion 103 and the corrugated portion 104, the presence of the concave portion 111 becomes a thin wall in the width direction. Therefore, the resistance when the deformed portion 70 is bent in the thickness direction is reduced, and the deformed portion 70 becomes more easily The back side is curved. Furthermore, by extending and connecting the concavities and convexities (concave 111 and convex 112) on the front and back (front and back sides) to the concavities and convexities (concave 113 and convex 114) of the side surface, it is possible to avoid twisting with respect to the thickness direction. To bend.

在外力的大小超過規定的閾值情況下，彈性變形部90根據超過的外力的大小彈性變形。另一方面，在外力的大小超過規定的閾值情況下，如圖12中的兩點虛線所示，當頸部20變形時，反轉部80跳躍屈曲並反轉。成為第二穩定狀態（以下稱為第二狀態）。在第二狀態下，反轉部80隨著朝向中央而逐漸朝向正面側傾斜的方向上反轉，於側視下向成為大致倒V字狀的方向反轉。在第二狀態下，反轉部80於長軸方向的中央成為頂點的正面側形成為凸狀。When the magnitude of the external force exceeds a predetermined threshold value, the elastic deformation portion 90 elastically deforms according to the magnitude of the excess external force. On the other hand, when the magnitude of the external force exceeds the predetermined threshold value, as shown by the two-dot dashed line in FIG. 12, when the neck portion 20 is deformed, the reversing portion 80 jumps and flexes and reverses. It becomes the second stable state (hereinafter referred to as the second state). In the second state, the inverting portion 80 is inverted in a direction that gradually inclines toward the front side as it goes toward the center, and in a direction in which it becomes a substantially inverted V shape in a side view. In the second state, the inverted portion 80 is formed in a convex shape on the front side where the apex is at the center in the longitudinal direction.

即，在外力的大小超過規定的閾值情況下，藉由彈性變形部90進行彈性變形，在確保變形部70的彎曲強度的狀態下，反轉部80自第一狀態跳躍屈曲並反轉而成為第二狀態。另外，由於在反轉部80與彈性變形部90之間設置有貫穿孔K，因此反轉部80與彈性變形部90可彼此獨立地變形，使反轉部80變得容易反轉。即，於施加刷牙負荷時，由於設置有貫穿孔K，因此不會阻礙彼此的變形行為，而可首先在只有彈性構件90彎曲之後，反轉部80再進行彎曲，再者，反轉部80與彈性變形部90之間未必要貫穿，亦可以形成有間隙S。 另外，相對於對刷頭部10的厚度方向的負荷，由於彈性變形部90在寬度方向的彎曲被抑制，進而可以抑制因扭轉引起的彎曲，因此可有助於反轉部80對向厚度方向的負荷準確地發揮功能。進而，針對反轉部80的反轉，需要儲存應變能，但是如上所述，相對於厚度方向的負荷，由於寬度方向的彎曲被抑制，進而因扭轉引起的彎曲亦被抑制，因此可以將刷牙時的負荷有效率地轉換為應變能。因此，在本實施方式中，可以在適當的時機使反轉部80進行明確的反覆屈曲。That is, when the magnitude of the external force exceeds a predetermined threshold, the elastic deformation portion 90 is elastically deformed, and while the bending strength of the deformation portion 70 is ensured, the inversion portion 80 buckles and reverses from the first state to become The second state. In addition, since the through hole K is provided between the inversion portion 80 and the elastic deformation portion 90, the inversion portion 80 and the elastic deformation portion 90 can be deformed independently of each other, so that the inversion portion 80 becomes easy to invert. That is, when the tooth brushing load is applied, the through hole K is provided, so that the deformation behavior of each other will not be hindered. First, after only the elastic member 90 is bent, the reversing portion 80 can be bent again, and furthermore, the reversing portion 80 It is not necessary to penetrate the elastic deformation portion 90, and a gap S may be formed. In addition, with respect to the load on the thickness direction of the brush head portion 10, since the bending of the elastic deformation portion 90 in the width direction is suppressed, and the bending caused by torsion can be suppressed. Therefore, it can help the reversing portion 80 to face the thickness direction. The load functions accurately. Furthermore, for the reversal of the reversal portion 80, it is necessary to store strain energy. However, as described above, with respect to the load in the thickness direction, the bending in the width direction is suppressed, and the bending due to torsion is also suppressed, so it is possible to brush the teeth. The load at time is efficiently converted into strain energy. Therefore, in the present embodiment, it is possible to cause the inversion portion 80 to perform clear and repeated buckling at an appropriate timing.

藉由所述反轉部80跳躍屈曲並反轉時的振動，握住握持部30的使用者可以偵測到對刷頭部10施加的向背面側的外力為超過閾值的過度刷牙狀態。By the vibration when the reversing part 80 jumps and flexes and reverses, the user holding the grip part 30 can detect that the external force applied to the brush head 10 to the back side is an excessive brushing state exceeding a threshold.

反轉部80在正面側的長軸方向的中央，即在包含凸狀的頂點的區域具有溝部81。反轉部80在背面側的長軸方向的中央，即包含凸狀的頂點的區域具有溝部82。槽部81、溝部82於寬度方向延伸。溝部81在側視中形成為在正面側配置有圓弧中心的圓弧形狀。溝部82在側視中形成為在背面側配置有圓弧中心的圓弧形狀。在反轉部80中未設置有溝部81、溝部82的情況下，則在反轉部80整體上均勻產生應力，難以產生跳躍屈曲。另一方面，藉由在反轉部80中設置有溝部81、溝部82，因此在溝部81、溝部82集中地產生應力，容易產生跳躍屈曲。The inverted portion 80 has a groove 81 in the center of the long axis direction on the front side, that is, in a region including the convex apex. The inverted portion 80 has a groove 82 in the center of the long axis direction on the back side, that is, in the region including the convex apex. The groove portion 81 and the groove portion 82 extend in the width direction. The groove 81 is formed in an arc shape in which the arc center is arranged on the front side in a side view. The groove 82 is formed in an arc shape in which the arc center is arranged on the back side in a side view. In the case where the groove 81 and the groove 82 are not provided in the reversing portion 80, stress is uniformly generated in the entire reversing portion 80, and skip buckling is unlikely to occur. On the other hand, since the groove portion 81 and the groove portion 82 are provided in the inversion portion 80, stress is concentratedly generated in the groove portion 81 and the groove portion 82, and jump buckling is likely to occur.

在側視中，作為圓弧形狀的溝部81、溝部82的半徑，較佳為1 mm以上、2 mm以下。在溝部81、溝部82的半徑未滿1 mm的情況下，有反轉部80不進行反轉的可能性。在溝部81、溝部82的半徑超過2 mm的情況下，有反轉部80反轉時的振動變小而變得難以偵測到處於過度刷牙狀態的可能性。In a side view, the radius of the arc-shaped groove portion 81 and the groove portion 82 is preferably 1 mm or more and 2 mm or less. If the radius of the groove 81 and the groove 82 is less than 1 mm, there is a possibility that the reversing section 80 does not reverse. When the radius of the groove 81 and the groove 82 exceeds 2 mm, the vibration of the reversing section 80 when reversing is reduced, and it may become difficult to detect the state of excessive brushing.

作為溝部81、溝部82的深度，較佳為溝部81深於溝部82。在溝部82深於槽部81的情況下，即使在外力的大小超過規定的閾值的情況下，反轉部80亦難以反轉。另外，在溝部81深於溝部82的情況下，可以引導反轉部80變得更容易向正面側跳躍屈曲。再者，亦可不為設置有溝部81、溝部82兩者的構成，可為不設置有溝部82，而僅設置有溝部81的構成。As the depth of the groove 81 and the groove 82, it is preferable that the groove 81 is deeper than the groove 82. In the case where the groove portion 82 is deeper than the groove portion 81, even when the magnitude of the external force exceeds a predetermined threshold value, the inversion portion 80 is difficult to invert. In addition, when the groove portion 81 is deeper than the groove portion 82, it is possible to guide the inversion portion 80 to be more likely to jump and flex to the front side. In addition, the configuration in which both the groove portion 81 and the groove portion 82 are provided may not be provided, and the groove portion 82 may not be provided, and only the groove portion 81 may be provided.

由於反轉部80在包含凸狀的頂點的區域設置有溝部81、溝部82，因此包括凸狀的頂點的區域比其他區域薄。因此，因為超過閾值的外力所引起的反轉部80的變形而積蓄的應變能能夠立即從溝部81、溝部82作為起點而釋放，可使反轉部80進行反轉。另外，如上所述，由於變形部70的各向異性高，且反轉部80在厚度方向的變形容易，因此藉由因反轉部80的變形而積蓄的應變能，可有助於反轉部80的有效率的向厚度方向反轉等的功能。進而，可調整厚度方向的溝部81、溝部82的位置，而調整反轉部80自第一狀態反轉到第二狀態的位置。Since the inversion part 80 is provided with the groove part 81 and the groove part 82 in the area|region including the convex apex, the area|region including the convex apex is thinner than other regions. Therefore, the strain energy accumulated due to the deformation of the inversion portion 80 caused by the external force exceeding the threshold value can be immediately released from the groove portion 81 and the groove portion 82 as a starting point, and the inversion portion 80 can be reversed. In addition, as described above, since the anisotropy of the deforming portion 70 is high and the inversion portion 80 is easily deformed in the thickness direction, the strain energy accumulated due to the deformation of the inversion portion 80 can contribute to the inversion. The part 80 has functions such as efficient reversal in the thickness direction. Furthermore, the positions of the groove portion 81 and the groove portion 82 in the thickness direction can be adjusted, and the position of the reversing portion 80 from the first state to the second state can be adjusted.

另外，在側視中溝部81、溝部82形成為圓弧形狀，因此例如與在兩個交叉平面形成為V字狀的情況相比，即使包含溝部81、溝部82的反轉部80的頂點向厚度方向移動時，亦可以緩和頂點處的應力集中。In addition, the groove portion 81 and the groove portion 82 are formed in a circular arc shape in a side view. Therefore, for example, compared with the case where the two intersecting planes are formed in a V shape, even if the apex of the inverted portion 80 including the groove portion 81 and the groove portion 82 faces When moving in the thickness direction, the stress concentration at the apex can also be alleviated.

作為對刷頭部10施加的向背面側的外力的閾值，例如為適當的刷牙壓力的上限值。The threshold value of the external force applied to the brush head 10 to the back side is, for example, the upper limit value of an appropriate toothbrushing pressure.

如圖10所示，相對於與長軸方向及寬度方向平行的平面，作為反轉部80傾斜角度θ較佳為5度以上、11度以下，更佳為7度以上、11度以下。在所述傾斜角度θ未滿5度的情況下，由於反轉部80未跳躍屈曲而變形，因此有難以偵測處於過度刷牙狀態的可能性。在所述傾斜角度θ超過11度的情況下，具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時反轉部80斷裂而失去可逆性的可能性。As shown in FIG. 10, with respect to a plane parallel to the major axis direction and the width direction, the inclination angle θ of the inversion portion 80 is preferably 5 degrees or more and 11 degrees or less, and more preferably 7 degrees or more and 11 degrees or less. In the case where the inclination angle θ is less than 5 degrees, since the reversing portion 80 is not buckled and deformed, it may be difficult to detect the state of excessive brushing. In the case where the inclination angle θ exceeds 11 degrees, the reversing part 80 is difficult to flex and reverse under excessive brushing pressure, or the reversing part 80 breaks and loses reversibility when reversed by jumping flexion. .

作為反轉部80的厚度，較佳為除去溝部81、溝部82而為1 mm以上、2mm以下。在反轉部80的厚度未滿1 mm的情況下，有雖然變形但並未跳躍屈曲而難以偵測處於過度刷牙狀態的可能性。在反轉部80的厚度超過2 mm的情況下，具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時反轉部80斷裂而失去可逆性的可能性。The thickness of the inversion portion 80 is preferably 1 mm or more and 2 mm or less except for the groove portion 81 and the groove portion 82. In the case where the thickness of the reversing portion 80 is less than 1 mm, there is a possibility that it is deformed but not flexed and it is difficult to detect the state of excessive brushing. In the case where the thickness of the reversal portion 80 exceeds 2 mm, the reversal portion 80 is difficult to flex and reverse under excessive brushing pressure, or the reversal portion 80 breaks and loses reversibility when reversed by jumping flexion. Sex.

作為反轉部80的寬度，較佳為1.5 mm以上。在反轉部80的寬度未滿1.5 mm的情況下，有變得容易在寬度方向彎曲的可能性。 若將反轉部80的最大厚度設為T（mm），將變形部70的最大厚度設為t（mm）時，則藉由規定由T/t所表示的值，可以控制在施加了過剩的刷牙負荷時反轉部80的反轉難易度及所述時機（閾值）。作為由T/t所表示的值較佳為0.05以上、0.35以下，更佳為0.10以上、0.35以下。在由T/t所表示的值未滿0.05的情況下，反轉部80雖然亦追隨變形部70（彈性變形部90）的彎曲的方式而變形，但是因為不會發生跳躍屈曲，因此有難以偵測處於過度刷牙狀態的可能性。若由T/t所表示的值超過0.35，則具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時斷裂而而失去反轉部80的可逆性的可能性。The width of the inversion portion 80 is preferably 1.5 mm or more. When the width of the inversion portion 80 is less than 1.5 mm, there is a possibility that it becomes easy to bend in the width direction. If the maximum thickness of the inverted portion 80 is set to T (mm) and the maximum thickness of the deformed portion 70 is set to t (mm), by specifying the value represented by T/t, it is possible to control the application of excess The reversal difficulty of the reversing part 80 and the timing (threshold value) at the time of toothbrushing load. 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. When the value represented by T/t is less than 0.05, although the reversal portion 80 also deforms following the bending of the deformed portion 70 (elastically deformed portion 90), it is difficult to cause skip buckling. Detect the possibility of excessive brushing. If the value represented by T/t exceeds 0.35, it is difficult for the reversing part 80 to jump and buckle and reverse under excessive brushing pressure, or break when jumping flexion and reverse and lose the reversibility of the reversing part 80 possibility.

如圖9所示，若將反轉部80的最大寬度設為L（mm），變形部70的最大寬度設為W（mm），則藉由規定由L/W所表示的值，例如可以控制在施加了過剩的刷牙負荷時反轉部80的反轉難易度及所述時機（閾值）。由L/W所表示的值較佳為0.05以上、0.35以下，更佳為0.10以上、0.35以下。在由L/W所表示的值未滿0.05的情況下，反轉部80雖然亦追隨變形部70（彈性變形部90）的彎曲的方式而變形，但是難以跳躍屈曲，因此有難以偵測處於過度刷牙狀態的可能性。若由L/W所表示的值超過0.35，則反轉部80在通常刷牙範圍所產生的手柄體2的彎曲下難以變形及反轉。因此，具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時斷裂而而失去反轉部80的可逆性的可能性。即，藉由將T/t及L/W設為所述範圍內，反轉部80相對於彈性變形部90的彎曲強度在規定的比例下變得柔軟，且相對於承擔手柄骨架的彈性變形部90的彎曲，可以使反轉部80延遲地運作。因此，即使在施加過剩的刷牙負荷的情況下，亦可以控制反轉部80的反轉難易度及成為反轉部80反轉的契機的時機（閾值）。As shown in FIG. 9, if the maximum width of the inverted portion 80 is set to L (mm) and the maximum width of the deformed portion 70 is set to W (mm), by specifying the value represented by L/W, for example, The reversal difficulty and the aforementioned timing (threshold value) of the reversing section 80 when an excessive brushing load is applied are controlled. 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. When the value represented by L/W is less than 0.05, although the reversal portion 80 also deforms following the bending of the deformed portion 70 (elastic deformable portion 90), it is difficult to jump and buckle, so it is difficult to detect the position Possibility of excessive brushing state. If the value represented by L/W exceeds 0.35, the reversing portion 80 is unlikely to be deformed and reversed under the bending of the handle body 2 generated in the normal toothbrushing range. Therefore, the reversing part 80 is difficult to bend and reverse under excessive brushing pressure, or breaks when reversing by jumping flexion, and the reversibility of the reversing part 80 may be lost. That is, by setting T/t and L/W within the above-mentioned ranges, the bending strength of the reversing portion 80 with respect to the elastic deformation portion 90 becomes soft at a predetermined ratio, and the elastic deformation of the handle frame is relatively low. The bending of the portion 90 can delay the operation of the reversing portion 80. Therefore, even when an excessive brushing load is applied, it is possible to control the reversal difficulty of the reversing section 80 and the timing (threshold value) that triggers the reversal of the reversing section 80.

作為反轉部80的長軸方向的長度，較佳為15 mm以上、30 mm以下，更佳為15 mm以上、25 mm以下，進而佳為15 mm以上、20 mm以下。反轉部80的前端側端部的位置為貫穿孔73的前端側端部的位置。反轉部80的後端側端部的位置為貫穿孔73的後端側端部的位置。在反轉部80的長軸方向的長度未滿15 mm的情況下，則有反轉部80在通常的刷牙壓力下難以跳躍屈曲並反轉，並且無法產生為了顯現跳躍屈曲的必要變形的可能性。在反轉部80的長軸方向的長度超過30 mm的情況下，由於直到跳躍屈曲為止所需的位移變得非常大，因此有使用性大幅降低，並且反轉部80的變形行為成為與彈性變形部90的變形行為相同的可能性。The length in the major axis direction of the inversion portion 80 is preferably 15 mm or more and 30 mm or less, more preferably 15 mm or more and 25 mm or less, and still more preferably 15 mm or more and 20 mm or less. The position of the distal end side of the inversion portion 80 is the position of the distal end side of the through hole 73. The position of the rear end side end of the inversion portion 80 is the position of the rear end side end of the through hole 73. In the case where the length of the long axis direction of the reversing portion 80 is less than 15 mm, the reversing portion 80 is difficult to jump and reverse under normal toothbrushing pressure, and may not be deformed to show the jump flexion. Sex. In the case where the length of the long axis direction of the reversing portion 80 exceeds 30 mm, the displacement required to jump flexion becomes very large, so the usability is greatly reduced, and the deformation behavior of the reversing portion 80 becomes more elastic. It is possible that the deformation behavior of the deformed portion 90 is the same.

在側視中，反轉部80位於在彈性變形部90的植毛面11側的外形輪廓與背面側的外形輪廓之間。更詳細而言，作為反轉部分80的厚度方向的位置，以反轉部80不形成牙刷的最外輪廓的方式，藉由在側視中不設為自彈性變形部90的厚度方向突出的位置，例如可以防止反轉部80在使用時與使用者接觸。具體而言，較佳為較彈性變形部90的厚度成為一半的位置更靠背面側。在反轉部80的厚度方向的位置位於較變形部70的厚度成為一半的位置更靠背面側的情況下，當反轉部80反轉至第二狀態時，反轉部80的頂點自彈性變形部90的正面側表面突出而可減少與使用者的手指接觸的可能性。另外，藉由在較彈性變形部90的厚度成為一半的位置更靠背面側配置反轉部80，由於反轉部80在彎曲時，比起正面側而言更壓縮背面側，因此例如變得容易積蓄成為反轉的契機的能量，可使應變能有效率地傳遞到反轉部80。In a side view, the inverted portion 80 is located between the outer contour on the side of the tufted surface 11 of the elastic deformation portion 90 and the outer contour on the back side. In more detail, as the position of the thickness direction of the reversing portion 80, the reversing portion 80 does not form the outermost contour of the toothbrush, and it is not set to protrude from the thickness direction of the elastic deformation portion 90 in a side view. The position can prevent the reversing part 80 from contacting the user during use, for example. Specifically, it is preferable to be closer to the back side than the position where the thickness of the elastic deformation portion 90 becomes half. In the case where the position of the thickness direction of the reversing portion 80 is closer to the back side than the position where the thickness of the deforming portion 70 is half, when the reversing portion 80 is reversed to the second state, the vertex of the reversing portion 80 is self-elastic The front side surface of the deforming portion 90 protrudes to reduce the possibility of contact with the user's finger. In addition, by arranging the reversing portion 80 closer to the back side at a position where the thickness of the elastically deformable portion 90 is half, since the reversing portion 80 compresses the back side more than the front side when bending, it becomes, for example, It is easy to accumulate energy that triggers the reversal, and the strain energy can be efficiently transmitted to the reversing part 80.

構成反轉部80的硬質樹脂的彎曲彈性係數較佳為1500 MPa以上、3500 MPa以下，更佳為2000 MPa以上、3500 MPa以下。在硬質樹脂的彎曲彈性係數未滿1500 MPa的情況下，有反轉部80雖然變形但並未跳躍屈曲而難以偵測處於過度刷牙狀態的可能性。在硬質樹脂的彎曲彈性係數超過3500 MPa的情況下，具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時斷裂而而失去反轉部80的可逆性的可能性。另外，藉由使用具有規定的彎曲彈性係數的原材料，可在短時間內集中地產生隨著跳躍屈曲引起的振動，從而變得敏銳（尖銳、大）。結果，對於使用者來說偵測到過度刷牙變得容易。The bending elastic modulus of the hard resin constituting the inversion portion 80 is preferably 1500 MPa or more and 3500 MPa or less, and more preferably 2000 MPa or more and 3500 MPa or less. In the case where the bending elastic coefficient of the hard resin is less than 1500 MPa, there is a possibility that the inversion portion 80 is deformed but does not buckle, making it difficult to detect the state of excessive brushing. When the bending elasticity coefficient of the hard resin exceeds 3500 MPa, the reversing part 80 is difficult to buckle and reverse under excessive brushing pressure, or it breaks when reversing by jumping flexion and loses the reversibility of the reversing part 80 The possibility. In addition, by using materials with a predetermined bending elasticity coefficient, vibrations caused by jumping flexion can be concentrated in a short period of time, thereby becoming sharp (sharp, large). As a result, it becomes easy for the user to detect excessive brushing.

作為反轉部80跳躍屈曲時的凸狀的頂點在厚度方向的移動距離，較佳為0.2 mm以上、5.0 mm以下。在頂點在厚度方向的移動距離未滿0.2 mm的情況下，跳躍屈曲時的振動變小，有難以偵測處於過度刷牙狀態的可能性。在頂點在厚度方向的移動距離超過5.0 mm的情況下，具有反轉部80在過度刷牙壓力下難以跳躍屈曲並反轉，或者在跳躍屈曲而反轉時斷裂而而失去反轉部80的可逆性的可能性。若跳躍屈曲時反轉部80的移動距離處在所述範圍，則由於跳躍屈曲而產生的振動在短時間內集中地產生且變得敏銳（尖銳、大）。結果，對於使用者來說偵測到過度刷牙變得容易。The movement distance of the convex apex of the inverted portion 80 in the thickness direction at the time of jumping flexion is preferably 0.2 mm or more and 5.0 mm or less. If the movement distance of the apex in the thickness direction is less than 0.2 mm, the vibration during jump flexion becomes smaller, and it may be difficult to detect excessive brushing. In the case where the moving distance of the apex in the thickness direction exceeds 5.0 mm, the reversing part 80 is difficult to flex and reverse under excessive brushing pressure, or breaks when reversing by jumping flexion and loses the reversibility of the reversing part 80 The possibility of sex. If the moving distance of the reversal portion 80 is within the above range during the jump flexion, the vibration due to the jump flexion is concentratedly generated in a short time and becomes sharp (sharp, large). As a result, it becomes easy for the user to detect excessive brushing.

作為彈性變形部90的硬質部90H的厚度，較佳為2.0 mm以下，且較佳為寬度大於厚度。在硬質部90H的厚度為2.0 mm以下的情況下，由於成為平面應力狀態，因此硬質部90H難以產生內部應力。其結果，即使變形亦難以斷裂，並且可以充分地儲存反轉部80的反轉所需要的能量。另外，作為結果，可以明確彈性變形部90的彎曲行為的各向異性，並且可以使扭轉變得困難。The thickness of the hard portion 90H of the elastic deformation portion 90 is preferably 2.0 mm or less, and the width is preferably greater than the thickness. When 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, it is difficult to break even if deformed, and the energy required for the inversion of the inversion portion 80 can be sufficiently stored. In addition, as a result, the anisotropy of the bending behavior of the elastic deformation portion 90 can be clarified, and twisting can be made difficult.

另外，在本實施方式的牙刷1中，由於反轉部80和彈性變形部90在寬度方向上隔著間隙地配置，因此變形部70更容易向正面側和背面側變形，可以成為在長軸方向及寬度方向上幾乎不變形的平面應力狀態。即，在本實施方式的牙刷1中，反轉部80及彈性變形部90變形的方向是在寬度方向上彼此分離的厚度方向，並且成為不存在於同一平面上的構成。換句話說，彈性變形部90藉由厚度方向上的外力而變形的路徑與反轉部80藉由厚度方向上的外力而變形的路徑被無干擾地設置。因此，在本實施方式的牙刷1中，彈性變形部90及反轉部80更難以受到彼此的限制而能夠變形，因此能夠進一步充分地儲存反轉部80的反轉所需的能量，且在反轉部80（特別是溝部81、溝部82）中集中地產生應力，而顯現出敏銳的跳躍屈曲。In addition, in the toothbrush 1 of the present embodiment, since the inverted portion 80 and the elastically deformed portion 90 are arranged with a gap in the width direction, the deformed portion 70 is more easily deformed to the front side and the back side, and can be formed on the long axis. Plane stress state with almost no deformation in the direction and width direction. That is, in the toothbrush 1 of the present embodiment, the direction in which the inverted portion 80 and the elastic deformation portion 90 are deformed is a thickness direction separated from each other in the width direction, and is a configuration that does not exist on the same plane. In other words, the path where the elastic deformation portion 90 is deformed by the external force in the thickness direction and the path where the reversal portion 80 is deformed by the external force in the thickness direction are provided without interference. Therefore, in the toothbrush 1 of the present embodiment, the elastic deformation portion 90 and the reversal portion 80 are more difficult to be restricted by each other and can be deformed. Therefore, the energy required for the reversal of the reversal portion 80 can be more sufficiently stored, and the Stress is concentratedly generated in the inversion portion 80 (especially the groove portion 81 and the groove portion 82), and sharp jump flexion is exhibited.

特別地，在本實施方式的牙刷1中，彈性變形部90中的一對硬質部90H在厚度方向上被配置於相同位置，並且相對於硬質部90H的反轉部80的一部分在第一狀態下於寬度方向上重疊，因此例如即使在對刷頭部10施加寬度方向上的外力時，亦難以產生在長軸方向上延伸的軸線周圍的扭轉。因此，在本實施方式的牙刷1中，變形部70難以在寬度方向上變形，並且可以提高彎曲強度。In particular, in the toothbrush 1 of the present embodiment, the pair of hard portions 90H in the elastic deformation portion 90 are arranged at the same position in the thickness direction, and a part of the inverted portion 80 relative to the hard portion 90H is in the first state. Since the lower part overlaps in the width direction, for example, even when an external force in the width direction is applied to the brush head portion 10, it is difficult to generate twist around the axis extending in the major axis direction. Therefore, in the toothbrush 1 of the present embodiment, the deformed portion 70 is difficult to deform in the width direction, and the bending strength can be improved.

如圖9所示，在與長軸方向正交的剖面中，作為由相對於變形部70的最大截面積的凹處71、凹處72的空間的截面積（從變形部70的最大截面積中去除一對彈性變形部90與反轉部80的截面積而獲得的截面積）的比值所表示的凹處71、凹處72的空間占有率較佳為35％以上、60％以下。此處，變形部70的最大截面積為於如圖9所示的與變形部70的長軸方向正交的剖面中，藉由假想地連接一對彈性變形部90的正面側的最外輪廓，並且假想地連接一對彈性變形部90的背面側的最外輪廓而形成的圖形的面積。As shown in FIG. 9, in the cross section orthogonal to the long axis direction, the cross-sectional area of the space defined by the recess 71 and the recess 72 with respect to the largest cross-sectional area of the deformed portion 70 (from the largest cross-sectional area of the deformed portion 70 The ratio of the cross-sectional area obtained by excluding the cross-sectional area of the pair of elastic deformable portion 90 and the inverted portion 80) represents the space occupancy ratio of the recess 71 and the recess 72, preferably 35% or more and 60% or less. Here, the maximum cross-sectional area of the deformable portion 70 is the cross-section orthogonal to the long axis direction of the deformed portion 70 as shown in FIG. 9 by imaginarily connecting the outermost contours of the front side of the pair of elastic deformable portions 90 , And the area of a figure formed by imaginarily connecting the outermost contours of the back side of the pair of elastic deformation portions 90.

在所述佔有率未滿35％的情況下，彈性變形部90和反轉部80的佔有率增加，在刷牙時朝向厚度方向背面側的彎曲強度變大。在所述情況下，難以維持適當的刷牙壓力，有難以抑制過度刷牙的可能性。在所述佔有率超過60％的情況下，彈性變形部90及反轉部80的佔有率降低，在刷牙時朝向寬度方向的彎曲強度變小。在所述情況下，在刷牙時，對於寬度方向的外力的彎曲變大，有難以精確地對每一顆牙齒的齒列進行刷牙的可能性。When the occupancy rate is less than 35%, the occupancy rate of the elastic deformation portion 90 and the reversal portion 80 increases, and the bending strength toward the back side in the thickness direction at the time of brushing increases. In this case, it is difficult to maintain an appropriate brushing pressure, and there is a possibility that it is difficult to suppress excessive brushing. When the occupancy rate exceeds 60%, the occupancy rate of the elastic deformation portion 90 and the reversal portion 80 decreases, and the bending strength in the width direction at the time of brushing decreases. In this case, when brushing the teeth, the bending of the external force in the width direction becomes large, and there is a possibility that it is difficult to accurately brush the dentition of each tooth.

[實施例] 以下表示實施例來對本發明進行詳細說明，但本發明並不限定於以下的實施例，可於不脫離其主旨的範圍內適宜變更來實施。[Example] Examples are shown below to describe the present invention in detail, but the present invention is not limited to the following examples, and can be implemented with appropriate changes within a range that does not deviate from the gist.

（實施例1～實施例4、比較例1～比較例4） 根據下述[表1]中所示的規格，製作實施例1～實施例4、比較例1～比較例4的樣品。 實施例1～實施例2、比較例1～比較例2設為變形部中不具有貫穿孔及反轉部的牙刷（相當於第一實施方式中所示的牙刷）。實施例3～實施例4、比較例3設為變形部中具有貫穿孔及反轉部的牙刷（相當於第二實施方式中所示的牙刷）。比較例4將不具有變形部的獅王（Lion）股份有限公司製的「齒力佳優勢（Clinica Advantage）3列普通版」的牙刷設為樣本。(Example 1 to Example 4, Comparative Example 1 to Comparative Example 4) According to the specifications shown in the following [Table 1], samples of Examples 1 to 4, and Comparative Examples 1 to 4 were produced. Examples 1 to 2, Comparative Examples 1 to 2 were used as toothbrushes (corresponding to the toothbrush shown in the first embodiment) that did not have a through hole and a reversal portion in the deformed portion. Examples 3 to 4, and Comparative Example 3 are toothbrushes (corresponding to the toothbrushes shown in the second embodiment) having through holes and reversal portions in the deformed portion. In Comparative Example 4, a toothbrush of "Clinica Advantage 3-row regular version" manufactured by Lion Co., Ltd., which does not have a deformed part, was used as a sample.

另外，實施例1～實施例3、比較例2將在變形部的正面側及背面側（表面及背面）設置了波紋部的牙刷設為樣本。針對實施例4，將除了變形部的正面側及背面側（表面及背面）之外，在寬度方向兩側（左右）亦設置了波紋部的牙刷作為樣本。In addition, Example 1-Example 3, and Comparative Example 2 used the toothbrush which provided the corrugated part on the front side and back side (front surface and back surface) of a deformation|transformation part as a sample. For Example 4, in addition to the front side and the back side (front and back) of the deformed portion, a toothbrush with corrugated portions provided on both sides (left and right) in the width direction was used as a sample.

[評價方法] 針對實施例1～實施例4、比較例1～比較例4，分別評價「緩和過剩的刷牙負荷的實感」、「對目標部位好好地刷牙的實感（各向異性）」及「反轉部的跳躍屈曲的容易度」。[Evaluation method] For Example 1 to Example 4, and Comparative Example 1 to Comparative Example 4, "the actual feeling of alleviating the excessive brushing load", "the actual feeling of brushing the target site (anisotropy)" and "the effect of the reversal part" were evaluated respectively. Ease of jumping flexion."

[試驗方法] 專門小組（5人）使用各樣本進行刷牙，分別針對「藉由彎曲緩和過剩的刷牙負荷的實感（可維持適當的刷牙負荷的感受）」、「對目標部位好好地刷牙的實感」及「當給予過剩的刷牙負荷時的、反轉部的跳躍屈曲的容易度」，在實際使用中進行五階段評價，並以其平均分數進行評價。評分的平均值，小數點第二位後四捨五入，設為到小數點後第一位的數值 [評分] 5分：非常感受到、4分：稍微感受到、3分：皆非、2分：不太能感受到，1分：完全未感受到 [評價] ◎+（極好）：4.7～5.0、◎（非常好）：4.3～未滿4.7、○（好）：4.0～未滿4.3、△（還不錯）：3.0～未滿4.0、△-（不好）：2.5～未滿3.0、×（差）:未滿2.5分[experiment method] A dedicated group (5 people) used each sample to brush their teeth. They focused on "the feeling of easing the excess brushing load by bending (the feeling of maintaining a proper brushing load)", "the feeling of brushing the target site well", and "the actual feeling of brushing your teeth well." The ease of jumping flexion of the inverted part when an excessive brushing load is applied" was evaluated in five stages in actual use, and the average score was used for evaluation. The average value of the score, rounded up to the second decimal place, and set to the first decimal place [score] 5 points: very much felt, 4 points: slightly felt, 3 points: nothing, 2 points: not very visible, 1 point: not felt at all [Evaluation] ◎+ (very good): 4.7 to 5.0, ◎ (very good): 4.3 to less than 4.7, ○ (good): 4.0 to less than 4.3, △ (good): 3.0 to less than 4.0, △ -(Bad): 2.5 to less than 3.0, × (poor): less than 2.5 points

[表1]     實施例1 實施例2 實施例3 實施例4 比較例1 比較例2 比較例3 比較例4           變形部要素 變形部 有 有 有 有 有 有 有 無 硬質部70H的最小厚度T（mm） 1.6 1.6 2.0 2.0 1.6 1.6 2.0 - 硬質部70H的寬度W（mm） 9.0 9.0 2.3 2.3 9.0 9.0 2.3 - 有無貫穿孔 無 無 有 有 無 無 有 無 有無反轉部 無 無 有 有 無 無 有 無 有無凹凸結構部/位置 有/表面背面 有/表面背面 有/表面背面 有/表面背面+左右 無 有/表面背面 無 無 第一方向、第二方向的彎曲強度的關係 第一＜第二 第一＜第二 第一＜第二 第一＜第二 第一＜第二 第一＜第二 第一＜第二 第一≒第二 相對於變形部的截面積的硬質部的截面積的佔有率（%） 32 32 14 14 33 38 14 - 凹部相對凸部的深度相對於變形部的最大厚度的比例（%） 30.0 9.0 9.0 9.0 - 30.0 - -   評價項目 緩和過剩的刷牙負荷的實感 ○ ○ ◎ ◎+ × × △ × 對目標部位好好地刷牙的實感（各向異性） △ ○ ◎ ◎ △- △- △- × 反轉部的跳躍屈曲的容易度 - - ○ ◎ - - △ - [Table 1] Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Deformation element Deformation Have Have Have Have Have Have Have no The minimum thickness T of the hard part 70H (mm) 1.6 1.6 2.0 2.0 1.6 1.6 2.0 - The width W of the hard part 70H (mm) 9.0 9.0 2.3 2.3 9.0 9.0 2.3 - With or without through holes no no Have Have no no Have no With or without reversal part no no Have Have no no Have no Whether there is uneven structure/position Yes / surface and back Yes / surface and back Yes / surface and back Yes / surface back + left and right no Yes / surface and back no no The relationship between the bending strength in the first direction and the second direction First <second First <second First <second First <second First <second First <second First <second First ≒ second Occupancy rate of the cross-sectional area of the hard part relative to the cross-sectional area of the deformed part (%) 32 32 14 14 33 38 14 - The ratio of the depth of the concave portion to the convex portion relative to the maximum thickness of the deformed portion (%) 30.0 9.0 9.0 9.0 - 30.0 - - Evaluation item Alleviate the feeling of excessive brushing load ○ ○ ◎ ◎+ X X △ X The actual feeling of brushing your teeth well on the target area (anisotropy) △ ○ ◎ ◎ △- △- △- X Ease of jumping flexion of the reverse part - - ○ ◎ - - △ -

如[表1]所示，於變形部的正面側及背面側設置有凹凸結構部（波紋部），且變形部中硬質部的截面積的佔有率為35%以下的實施例1～實施例4的樣本中，針對「緩和過剩的刷牙負荷的實感」、「對目標部位好好地刷牙的實感」，進而具有反轉部的實施例3～實施例4中「反轉部的跳躍屈曲的容易度」，均獲得良好的評價。As shown in [Table 1], concavo-convex structure parts (corrugated parts) are provided on the front and back sides of the deformed part, and the cross-sectional area of the hard part in the deformed part is 35% or less. Examples 1 to Examples In the sample 4, "the actual feeling of alleviating the excessive brushing load", "the actual feeling of brushing the target site well", and the examples 3 to 4, which have the inversion part, "easy to jump and buckle in the inversion part" "Degrees" have been well evaluated.

相對於此，於變形部的正面側及背面側具有凹凸結構部，但變形部中硬質部的截面積的佔有率超過35%的比較例2的樣本，在「緩和過剩的刷牙負荷的實感」及「對目標部位好好地刷牙的實感」的任一者均未獲得良好的評價。另外，針對變形部中硬質部的截面積的佔有率為35%以下，但於變形部的正面側及背面側不具有凹凸結構部的比較例1的樣本，在「緩和過剩的刷牙負荷的實感」及「對目標部位好好地刷牙的實感」的任一者均未獲得良好的評價。另外，針對不具有變形部及凹凸結構部的比較例4的樣本，在「緩和過剩的刷牙負荷的實感」及「對目標部位好好地刷牙的實感」的任一者均未獲得良好的評價。另外，相對於實施例3的樣本，於變形部不具有凹凸結構部的比較例3的樣本，針對「對目標部位好好地刷牙的實感」未獲得良好的評價。In contrast, the sample of Comparative Example 2 in which the deformed part has uneven structure on the front side and the back side, but the cross-sectional area of the hard part in the deformed part exceeds 35%, is in the "real feeling of alleviating the excessive brushing load" And neither of the "feelings of brushing the teeth well on the target site" has not been well evaluated. In addition, the sample of Comparative Example 1 in which the cross-sectional area of the hard portion in the deformed portion has an occupancy rate of 35% or less, but does not have uneven structures on the front and back sides of the deformed portion, is described in the "Relief of Excessive Brushing Load" Neither of "" and "the actual feeling of brushing the target site well" has not been well evaluated. In addition, for the sample of Comparative Example 4 that did not have a deformed portion and a concavo-convex structure portion, a good evaluation was not obtained in either of the "feel of alleviating the excessive brushing load" and the "feel of brushing the teeth well on the target site". In addition, with respect to the sample of Example 3, the sample of Comparative Example 3 in which the deformed portion does not have a concavo-convex structure portion did not receive a good evaluation for "the actual feeling of brushing the target site well".

再者，如[表1]所示，在波紋部中的凹部相對凸部的深度相對於變形部的最大厚度的比例位於2％以上、20％以下的範圍內的實施例2～實施例4的樣本比起所述比例落於2％以上、20％以下的範圍外的實施例1，在「對目標部位好好地刷牙的實感」方面獲得了更良好的評價。另外，相對於實施例1〜實施例3的樣本，除變形部的正面側及背面側以外，在寬度方向的兩側亦具有凹凸結構部的實施例4的樣本在「緩和過剩的刷牙負荷的實感」的評價提高。Furthermore, as shown in [Table 1], the ratio of the depth of the concave portion to the convex portion in the corrugated portion relative to the maximum thickness of the deformed portion is in the range of 2% to 20% in Examples 2 to 4 Compared with Example 1, where the ratio falls outside the range of 2% or more and 20% or less, the sample of has a better evaluation in terms of "the actual feeling of brushing your teeth well on the target site". In addition, with respect to the samples of Examples 1 to 3, in addition to the front side and back side of the deformed portion, the sample of Example 4, which also has uneven structure on both sides in the width direction, is in the "relief of excessive brushing load". The evaluation of "real sense" has been improved.

以上，一面參照隨附圖式一面對本發明的適宜的實施方式進行了說明，但本發明當然不限定於所述例子。所述例中所示的各構成構件的各種形狀或組合等為一例，可於不脫離本發明的主旨的範圍內，根據設計要求等而進行各種變更。In the above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is of course not limited to the above-mentioned examples. The various shapes or combinations of the constituent members shown in the above examples are just examples, and various changes can be made in accordance with design requirements and the like without departing from the spirit of the present invention.

例如，於所述實施方式中，雖然例示了於變形部70設置有滾紋部101～滾紋部104的構成，但並不限於所述構成，例如亦可為不設置寬度方向兩側的滾紋部103、滾紋部104，而僅設置於正面側及背面側的滾紋部101、滾紋部102的構成。For example, in the above-mentioned embodiment, although the configuration in which the knurled portion 101 to the knurled portion 104 are provided in the deforming portion 70 is illustrated, it is not limited to the above-mentioned configuration. The ridge portion 103 and the knurled portion 104 are provided only on the knurled portion 101 and the knurled portion 102 on the front side and the back side.

另外，於所述實施方式中，雖然例示了變形部70具有彈性變形部90與反轉部80的構成，但並不限於所述構成，亦可為未設置有彈性變形部90與反轉部80的構成。In addition, in the above-described embodiment, although the deformation portion 70 has an elastic deformation portion 90 and a reversal portion 80 as an example, it is not limited to the above-mentioned structure, and the elastic deformation portion 90 and the reversal portion may not be provided. Composition of 80.

另外，於所述實施方式中，雖然例示了凹部71、凹部72的一部分藉由貫穿孔K貫穿厚度方向的構成，但並不限於所述構成，亦可為僅在正面側或背面側一者開口的構成。 [產業利用性]In addition, in the above-mentioned embodiment, although a configuration in which part of the recessed portion 71 and the recessed portion 72 is penetrated in the thickness direction by the through hole K is illustrated, it is not limited to the above-mentioned configuration, and it may be only on the front side or the back side. The composition of the opening. [Industrial Utilization]

本發明可應於牙刷。The present invention can be applied to toothbrushes.

1:牙刷 2:手柄體 10:刷頭部 11:植毛面 12:植毛孔 20:頸部 30:握持部 31H、32H、71、72:凹處 70:變形部 73、K:貫穿孔 73H、74H、75H、76H:曲面 80:反轉部 81、82:溝部 90:彈性變形部 101、102、103、104:波紋部 111、113:凹部 112、114:凸部 A1:第一部分 A2:第二部分 E、31E、32E、70E、90E:軟質部 H、20H、30H、70H、90H:硬質部 L、W:最大寬度 P1:第一區域 P2:第二區域 RP:排列間距 S:間隙 T、t:最大厚度 θ:傾斜角度 A-A、B-B:線1: Toothbrush 2: handle body 10: Brush the head 11: Tufted surface 12: Pore implantation 20: neck 30: Grip 31H, 32H, 71, 72: recess 70: Deformation 73, K: Through hole 73H, 74H, 75H, 76H: curved surface 80: Reversal part 81, 82: ditch 90: Elastic deformation part 101, 102, 103, 104: corrugated part 111, 113: recess 112, 114: Convex A1: The first part A2: The second part E, 31E, 32E, 70E, 90E: soft part H, 20H, 30H, 70H, 90H: hard part L, W: Maximum width P1: The first area P2: second area RP: Arrangement pitch S: gap T, t: maximum thickness θ: Tilt angle A-A, B-B: line

圖1是表示本發明的實施方式的圖，且為第一實施方式的牙刷1的正面圖。 圖2是以包含寬度方向的中心的平面切斷所述牙刷1的剖面圖。 圖3是在變形部70中靠近長軸方向端部與長軸方向正交的剖面圖。 圖4是以包含寬度方向的中心的平面切斷變形部70的剖面圖。 圖5是硬質部70H中的變形部70周邊的部分的正面圖。 圖6是硬質部70H中的變形部70周邊的部分的側面圖。 圖7是第二實施方式的牙刷1的正面圖。 圖8是以包含寬度方向的中心的平面切斷所述牙刷1的剖面圖。 圖9是在變形部70中於長軸方向中央與長軸方向正交的剖面圖。 圖10是以包含寬度方向的中心的平面切斷變形部70的剖面圖。 圖11是變形部70中的硬質部70H周邊的部分的正面圖。 圖12是用於說明反轉部進行反轉的、以與厚度方向及長軸方向平行的平面切斷變形部70的剖面圖。Fig. 1 is a diagram showing an embodiment of the present invention, and is a front view of the toothbrush 1 of the first embodiment. Fig. 2 is a cross-sectional view of the toothbrush 1 cut through a plane including the center in the width direction. 3 is a cross-sectional view of the deformed portion 70 near the end in the longitudinal direction and orthogonal to the longitudinal direction. 4 is a cross-sectional view of the deformed portion 70 cut by a plane including the center in the width direction. Fig. 5 is a front view of a portion around the deformed portion 70 in the hard portion 70H. FIG. 6 is a side view of the part around the deformed portion 70 in the hard portion 70H. Fig. 7 is a front view of the toothbrush 1 of the second embodiment. Fig. 8 is a cross-sectional view of the toothbrush 1 cut through a plane including the center in the width direction. FIG. 9 is a cross-sectional view perpendicular to the long axis direction at the center of the long axis direction in the deformed portion 70. FIG. 10 is a cross-sectional view of the deformed portion 70 cut in a plane including the center in the width direction. FIG. 11 is a front view of the portion around the hard portion 70H in the deformed portion 70. FIG. 12 is a cross-sectional view of the deformed portion 70 cut by a plane parallel to the thickness direction and the long axis direction for explaining the inversion of the inverted portion.

1:牙刷 1: Toothbrush

2:手柄體 2: handle body

10:刷頭部 10: Brush the head

11:植毛面 11: Tufted surface

12:植毛孔 12: Pore implantation

20:頸部 20: neck

30:握持部 30: Grip

31H、32H:凹處 31H, 32H: recess

70:變形部 70: Deformation

101、103、104:波紋部 101, 103, 104: corrugated part

111:凹部 111: recess

112:凸部 112: Convex

E、31E、32E:軟質部 E, 31E, 32E: soft part

H、20H、30H:硬質部 H, 20H, 30H: hard part

A-A:線 A-A: line

Claims (10)

一種牙刷，其特徵在於，包括： 刷頭部，具有設置於長軸方向的前端側的植毛面； 握持部，配置於較所述刷頭部更後端側； 頸部，配置於所述植毛面及所述握持部之間，所述刷頭部及所述頸部的至少一部分由硬質樹脂所形成； 變形部，配置於所述握持部，藉由與所述植毛面正交的第一方向的外力而變形； 第一區域，配置於所述變形部的所述前端側，藉由所述第一方向的外力而非變形；以及 第二區域，配置於所述變形部的所述後端側，藉由所述第一方向的外力而非變形， 所述握持部的在所述長軸方向上至少自所述握持部的前端遍及所述第二區域，且在與所述長軸方向正交的剖面的至少一部分由所述硬質樹脂形成， 所述變形部具有：硬質部，由連接所述第一區域與所述第二區域的所述硬質樹脂而形成；以及軟質部，由軟質樹脂所形成，且覆蓋所述硬質部的至少一部分， 在與所述長軸方向正交的剖面中，相對於由所述變形部的外形輪廓或所述外形輪廓的延長線所包圍的封閉空間的截面積，所述硬質部的截面積的佔有率遍及所述長軸方向為35%以下， 所述變形部向所述第一方向的彎曲強度被規範為小於向所述長軸方向及與所述第一方向正交的第二方向的彎曲強度， 所述軟質部具有凹凸結構部，所述凹凸結構部中，在與所述長軸方向交叉的方向上延長的凹部和凸部在所述長軸方向上互相相鄰配置， 所述凹凸結構部分別露出並設置於所述第一方向的所述植毛面側、和與所述第一方向的所述植毛面側為相對側的背面側。A toothbrush is characterized in that it comprises: The brush head has a tufting surface arranged on the front end side of the long axis direction; The holding part is arranged at a rear end side than the brush head part; The neck portion is arranged between the hair transplanting surface and the grip portion, and at least a part of the brush head portion and the neck portion are formed of hard resin; The deforming part is arranged at the grip part and is deformed by an external force in a first direction orthogonal to the tufting surface; The first area is disposed on the front end side of the deforming portion, and is not deformed by the external force in the first direction; and The second area is disposed on the rear end side of the deforming part, and is not deformed by the external force in the first direction, The grip portion extends over the second region from at least the tip of the grip portion in the long axis direction, and at least a part of the cross section orthogonal to the long axis direction is formed of the hard resin , The deformed portion has: a hard portion formed of the hard resin connecting the first area and the second area; and a soft portion formed of a soft resin and covering at least a part of the hard portion, In the cross section orthogonal to the long axis direction, the cross-sectional area of the hard portion relative to the cross-sectional area of the closed space enclosed by the outer contour of the deformed portion or the extension line of the outer contour It is 35% or less across the long axis direction, The bending strength of the deformed portion in the first direction is regulated to be smaller than the bending strength in the long axis direction and the second direction orthogonal to the first direction, The soft portion has a concavo-convex structure portion, and in the concavo-convex structure portion, a concave portion and a convex portion extending in a direction crossing the long axis direction are arranged adjacent to each other in the long axis direction, The concavo-convex structure portions are respectively exposed and provided on the side of the flocking surface in the first direction and the back side opposite to the side of the flocking surface in the first direction. 如請求項1所述的牙刷，其中 所述凹部相對於所述凸部的深度相對於所述變形部的所述第一方向的最大厚度而言為2%以上、20%以下。The toothbrush according to claim 1, wherein The depth of the concave portion with respect to the convex portion is 2% or more and 20% or less with respect to the maximum thickness of the deformed portion in the first direction. 如請求項1或請求項2所述的牙刷，其中 所述變形部的與所述長軸方向正交的剖面為多邊形， 所述變形部的所述第二方向兩側分別設置有所述凹凸結構部。The toothbrush according to claim 1 or 2, wherein The cross section of the deformed portion orthogonal to the long axis direction is a polygon, The concave-convex structure portion is respectively provided on both sides of the second direction of the deforming portion. 如請求項3所述的牙刷，其中 所述變形部的所述第二方向的最外輪廓相較於所述變形部的所述第一方向的中心位置而言位於更靠所述背面側。The toothbrush according to claim 3, wherein The outermost contour of the deformed portion in the second direction is located closer to the back surface than the center position of the deformed portion in the first direction. 如請求項1至請求項4中任一項所述的牙刷，其中 所述變形部經由貫穿所述第一方向且於所述長軸方向延長的貫穿孔於所述第二方向上分支， 分支的所述變形部分別具有：所述硬質部經由所述貫穿孔分支且連接所述第一區域和所述第二區部的芯部；以及所述軟質部對經由所述貫穿孔而分支的所述芯部的周圍進行覆蓋的覆蓋部。The toothbrush according to any one of claims 1 to 4, wherein The deformed portion is branched in the second direction through a through hole that penetrates the first direction and extends in the long axis direction, Each of the branched deformed portions has: the hard portion is branched via the through hole and a core portion that connects the first region and the second region portion; and the pair of soft portions is branched via the through hole A covering part that covers the periphery of the core part. 如請求項5所述的牙刷，其中 所述硬質部具有與所述芯部分離，並在所述長軸方向上貫穿所述貫穿孔而連接所述第一區域和所述第二區域的反轉部， 所述反轉部在第一方向的外力超過閾值時會跳躍屈曲而反轉。The toothbrush according to claim 5, wherein The hard part has an inversion part that is separated from the core part and penetrates the through hole in the long axis direction to connect the first region and the second region, When the external force in the first direction exceeds the threshold value, the reversing part will buckle and reverse. 如請求項1至請求項6中任一項所述的牙刷，其中 所述硬質部為平板狀， 所述硬質部的所述第二方向的長度大於所述硬質部的所述第一方向的長度。The toothbrush according to any one of claims 1 to 6, wherein The hard part is in the shape of a flat plate, The length of the hard part in the second direction is greater than the length of the hard part in the first direction. 如請求項7所述的牙刷，其中 所述硬質部的所述第一方向的中心相較於所述變形部的所述第一方向的中心位置而言位於更靠所述背面側。The toothbrush according to claim 7, wherein The center of the hard portion in the first direction is located closer to the back surface than the center position of the deformed portion in the first direction. 如請求項1至請求項8中任一項所述的牙刷，其中 所述變形部的所述長軸方向的長度為15 mm以上、30 mm以下。The toothbrush according to any one of claims 1 to 8, wherein The length of the deformed portion in the major axis direction is 15 mm or more and 30 mm or less. 如請求項1至請求項9中任一項所述的牙刷，其中 所述變形部的所述第二方向的長度為8 mm以上、20 mm以下。The toothbrush according to any one of claims 1 to 9, wherein The length of the deformed portion in the second direction is 8 mm or more and 20 mm or less.
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JP3040913U (en) 1997-02-25 1997-09-05 順元成興業股▲ふん▼有限公司 toothbrush
JP2000004944A (en) 1998-06-26 2000-01-11 Lion Corp Tooth brush
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JP5736734B2 (en) 2010-11-09 2015-06-17 サンスター株式会社 toothbrush
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