TW202123844A - toothbrush - Google Patents

Abstract

The objective of the present invention is to provide a toothbrush having excellent insertability, operability, and durability. In this toothbrush: the maximum thickness of a head portion (5) is at least 2.0 mm and less than 4 mm; when a brush main body (2) is viewed from the side, a bristle implanting surface side includes a first linear region (S1) extending continuously in a straight line from a bristle implanting surface (5a), a first curved region (E1) which has a center of curvature on the bristle implanting surface side, and which extends in an arc shape from a first inflection point (P1) toward the rear end side, and a second curved region (E2) which has a center of curvature on the rear surface side, which is the opposite side to the bristle implanting surface side, and which extends in an arc shape from a second inflection point (P2), positioned at the rear end of the first curved region, toward the rear end side; and the angle of inclination of a neck portion is at least equal to 8DEG and at most equal to 25DEG, where the angle of inclination is represented by the angle at which, when viewed from the side, a straight line passing through a rear end side edge portion of a bristle implanting hole positioned on the rearmost end side, among a plurality of bristle implanting holes, and the second inflection point, intersects a virtual line (50) passing through the rear end side edge portion (Q1) positioned on the rearmost end side, and a rear end side edge portion (Q2) of the bristle implanting hole positioned second from the rear end side.

Description

牙刷toothbrush

本發明是有關於一種牙刷。 本申請案基於2019年12月26日於日本提出申請的日本專利特願2019-237178號而主張優先權，並將其內容引用於本申請案中。The present invention relates to a toothbrush. This application claims priority based on Japanese Patent Application No. 2019-237178 filed in Japan on December 26, 2019, and the content is cited in this application.

對於齲齒、牙周病的預防，重要的是藉由使用牙刷的刷洗來去除口腔內的齒菌斑（plaque）。作為可使牙刷毛到達通常的牙刷難以到達的臼齒的深處（臼齒的咽喉側）的牙刷，例如市售有藉由於頭部的前端側的植毛部設置牙刷毛束（tuft）部而使毛尖容易到達臼齒的牙刷。For the prevention of dental caries and periodontal disease, it is important to remove plaque in the oral cavity by scrubbing with a toothbrush. As a toothbrush that allows the bristles to reach the depths of the molars (the throat side of the molars), which are difficult to reach by ordinary toothbrushes, for example, there are commercially available toothbrushes that have a tuft portion provided on the tip side of the head. A toothbrush that easily reaches the molars.

另外，於專利文獻1中揭示了一種牙刷，所述牙刷具有頸部，所述頸部於植毛面側及背面側兩者形成有圓弧中心位於植毛面側、於側視時植毛面側呈凹陷的圓弧輪廓的曲面。專利文獻1所揭示的牙刷藉由具有所述曲面，可提高對最後臼齒的***性或操作性。 [現有技術文獻] [專利文獻]In addition, Patent Document 1 discloses a toothbrush having a neck portion formed with an arc on both the tufting surface side and the back side. The curved surface of the concave arc profile. The toothbrush disclosed in Patent Document 1 has the curved surface, so that the insertability and operability of the last molar can be improved. [Prior Art Literature] [Patent Literature]

[專利文獻1]國際公開第2018/079114號[Patent Document 1] International Publication No. 2018/079114

[發明所欲解決之課題] 然而，於所述前端側的植毛部設置了牙刷毛束部的市售牙刷中，由於刷洗齒面時僅與牙刷毛束部接觸，因此存在難以刷洗齒面的大區域的問題。[The problem to be solved by the invention] However, in a commercially available toothbrush in which the bristle tuft portion is provided in the tufted portion on the front end side, since only the bristle tuft portion is contacted when the tooth surface is brushed, there is a problem that it is difficult to brush a large area of the tooth surface.

專利文獻1中所揭示的牙刷是背面側的頸部的形狀為於頭部與頸部的邊界附近暫時向背面側翹曲後向植毛面側翹曲的S字形狀的牙刷，因此於***口腔內的臼齒的深處時頸部的背面側有可能與臉頰接觸而降低使用感，要求使用感更優異的牙刷。另外，若自頭部延伸的頸部較粗，則於***口腔內時需要張大嘴唇，操作性降低。The toothbrush disclosed in Patent Document 1 is an S-shaped toothbrush whose neck shape on the back side is temporarily warped to the back side near the boundary between the head and neck and then warped to the tufting surface side. Therefore, it is inserted into the oral cavity. When the inner molars are deep, the back side of the neck may come into contact with the cheeks and reduce the feeling of use. A toothbrush with a better feeling of use is required. In addition, if the neck extending from the head is thick, the lips need to be widened when inserting into the oral cavity, which reduces the operability.

本發明是考慮以上方面而成，目的在於提供一種***性及操作性優異的牙刷。 [解決課題之手段]The present invention is made in consideration of the above aspects, and its object is to provide a toothbrush excellent in insertability and operability. [Means to solve the problem]

根據本發明的第一方式，可提供一種牙刷，所述牙刷包括刷本體，所述刷本體沿長軸方向設置有柄部、自所述柄部的前端延長的頸部、以及位於所述頸部的前端的頭部，於形成於所述頭部的植毛面的多個植毛孔植設有毛束，且所述牙刷的特徵在於，所述刷本體具有所述頸部的厚度自所述頭部朝向所述柄部連續增加的形狀，所述頭部的最大厚度為2.0 mm以上且小於4 mm，於側面觀察所述刷本體時的所述植毛面側，具有：第一直線區域，自所述植毛面連續地向後端側呈直線狀延伸；第一曲線區域，於所述植毛面側具有曲率中心，自位於所述第一直線區域的後端的第一拐點向所述後端側呈圓弧狀延伸；以及第二曲線區域，於與所述植毛面側為相反側的背面側具有曲率中心，自位於所述第一曲線區域的後端的第二拐點向所述後端側呈圓弧狀延伸，由貫穿所述側視時的位於最後端側的所述植毛孔的後端側緣部與所述第二拐點的直線和虛擬線交差的角度所表示的所述頸部的傾斜角度為8°以上且25°以下，所述虛擬線貫穿所述多個植毛孔中於所述側視時位於最後端側的所述植毛孔的後端側緣部與第二個位於後端側的所述植毛孔的後端側緣部。According to a first aspect of the present invention, there can be provided a toothbrush including a brush body provided with a handle along a long axis direction, a neck extending from the front end of the handle, and a toothbrush located at the neck The head at the front end of the head portion is implanted with tufts of hairs in a plurality of hair transplanting holes formed on the hair transplanting surface of the head, and the toothbrush is characterized in that the brush body has the thickness of the neck from the A shape in which the head continuously increases toward the handle, the maximum thickness of the head is 2.0 mm or more and less than 4 mm, and when the brush body is viewed from the side, the flocking surface side has: a first straight line region, from The tufted surface continuously extends linearly to the rear end side; the first curved area has a center of curvature on the tufted surface side and is rounded from the first inflection point at the rear end of the first straight line area to the rear end side Extending in an arc; and a second curved area having a center of curvature on the back side opposite to the side of the flocking surface, and forming a circular arc from a second inflection point located at the rear end of the first curved area toward the rear end side The inclination angle of the neck is represented by the angle of the intersection of the straight line and the virtual line of the second inflection point and the rear end side edge of the burr transplanting hole located on the rearmost end side when passing through the side view 8° or more and 25° or less, the virtual line penetrates the rear end side edge of the hair transplant hole located on the rearmost side in the side view among the plurality of hair transplant holes and the second one is located on the rear end side The rear edge of the transplanted pores.

另外，於所述本發明的一方式的牙刷中，其特徵在於，於所述側視時的所述背面側，具有：第二直線區域，自所述頭部的背面連續地向後端側呈直線狀延伸；以及第三曲線區域，於所述植毛面側具有曲率中心，自位於所述第二直線區域的後端的第三拐點向所述後端側呈圓弧狀延伸。In addition, in the toothbrush according to the one aspect of the present invention, it is characterized in that, on the back side in the side view, there is a second linear region continuously extending from the back side of the head to the rear end side. Extending linearly; and a third curved area having a center of curvature on the side of the tufting surface and extending in an arc shape from a third inflection point located at the rear end of the second linear area toward the rear end side.

另外，於所述本發明的一方式的牙刷中，其特徵在於，於所述側視時的所述背面側具有第四曲線區域，所述第四曲線區域於所述背面側具有曲率中心，自位於所述第三曲線區域的後端的第四拐點向所述後端側呈圓弧狀延伸。In addition, the toothbrush according to the aspect of the present invention is characterized in that it has a fourth curved area on the back side in the side view, and the fourth curved area has a center of curvature on the back side, The fourth inflection point located at the rear end of the third curved area extends in an arc shape toward the rear end side.

另外，於所述本發明的一方式的牙刷中，其特徵在於，所述頸部的最小厚度為3.0 mm～4.0 mm的於所述長軸方向上的長度為5 mm以上。In addition, in the toothbrush according to the aspect of the present invention, the minimum thickness of the neck portion is 3.0 mm to 4.0 mm, and the length in the long axis direction is 5 mm or more.

另外，於所述本發明的一方式的牙刷中，其特徵在於，所述頸部與所述柄部的邊界處的剖面形狀為橢圓形狀。In addition, in the toothbrush according to the aspect of the present invention, the cross-sectional shape at the boundary between the neck and the handle is an elliptical shape.

另外，於所述本發明的一方式的牙刷中，其特徵在於，所述頸部的於所述長軸方向上的長度為25 mm以上且45 mm以下。In addition, in the toothbrush according to the aspect of the present invention, the length of the neck in the major axis direction is 25 mm or more and 45 mm or less.

另外，於所述本發明的一方式的牙刷中，其特徵在於，於所述側視時的所述植毛面側的所述柄部與所述虛擬線的距離最長的所述長軸方向的位置位於比所述柄部的所述長軸方向的中央更靠前端側。In addition, in the toothbrush according to the aspect of the present invention, in the side view, the handle on the tuft surface side and the imaginary line have the longest distance in the long axis direction. The position is located closer to the tip side than the center of the handle in the longitudinal direction.

另外，於所述本發明的一方式的牙刷中，其特徵在於，所述頭部的前端側於所述側視時相對於所述虛擬線向所述植毛面側以5°以上且15°以下的角度傾斜。 [發明的效果]In addition, in the toothbrush according to the aspect of the present invention, the front end side of the head is set at 5° or more and 15° from the imaginary line to the tuft surface side in the side view. The following angle is inclined. [Effects of the invention]

本發明中，可提供***性、操作性優異的牙刷。In the present invention, a toothbrush excellent in insertability and operability can be provided.

以下，參照圖1至圖4說明本發明的牙刷的實施方式。 再者，以下的實施方式是表示本發明的一方式者，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，為了容易理解各結構，使實際的結構與各結構中的比例尺或數量等不同。Hereinafter, an embodiment of the toothbrush of the present invention will be described with reference to FIGS. 1 to 4. 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 facilitate understanding of each structure, the actual structure is different from the scale, number, etc. in each structure.

另外，於以下的說明中，將後述的頭部5的設置有植毛面5a的一側作為牙刷1的正面側，將頭部5的植毛面5a所面對之側的相反側作為牙刷1的背面側。此外，將與植毛面5a平行且與刷本體2的長度方向正交的方向作為牙刷1的寬度方向，將與植毛面5a正交的方向作為牙刷1的厚度方向來進行說明。另外，將設置有頭部5的一側作為前端側，將設置有柄部3的一側作為後端側來進行說明。In addition, in the following description, the side of the head 5 described later on which the tufted surface 5a is provided is referred to as the front side of the toothbrush 1, and the side opposite to the side facing the tufted surface 5a of the head 5 is referred to as the toothbrush 1. The back side. In addition, a direction parallel to the tufted surface 5a and orthogonal to the longitudinal direction of the brush body 2 will be referred to as the width direction of the toothbrush 1, and a direction orthogonal to the tufted surface 5a will be described as the thickness direction of the toothbrush 1. In addition, the description will be made assuming that the side on which the head 5 is provided is the front end side, and the side on which the handle 3 is provided as the rear end side.

圖1是表示牙刷1的結構的側面圖。圖2是自植毛面5a側觀察牙刷1的正面圖。圖3是頭部5的放大正面圖。圖4是頭部5的放大側面圖。圖2至圖4中，省略了刷40的圖示。FIG. 1 is a side view showing the structure of the toothbrush 1. Fig. 2 is a front view of the toothbrush 1 as viewed from the side of the grafted surface 5a. FIG. 3 is an enlarged front view of the head 5. FIG. 4 is an enlarged side view of the head 5. In FIGS. 2 to 4, illustration of the brush 40 is omitted.

如圖1及圖2所示，本實施方式的牙刷1包括刷本體2以及刷40，所述刷本體2包括整體上形成為長條狀的樹脂成形體。As shown in FIGS. 1 and 2, the toothbrush 1 of the present embodiment includes a brush body 2 and a brush 40, and the brush body 2 includes a resin molded body formed in an elongated shape as a whole.

刷本體2沿長軸方向設置有柄部3、自柄部3的前端延長的頸部4、以及設置於頸部4的前端的頭部5。所謂長軸方向，是指後述的虛擬線50延伸的方向。牙刷1中，可藉由植設於頭部5的植毛面5a～植毛面5d的多個毛束41對口腔內進行清掃。The brush body 2 is provided with a handle 3, a neck 4 extending from the front end of the handle 3, and a head 5 provided at the front end of the neck 4 along the longitudinal direction. The long axis direction refers to the direction in which the virtual line 50 described later extends. In the toothbrush 1, the inside of the oral cavity can be cleaned by a plurality of hair bundles 41 implanted on the hair transplantation surface 5a to the hair transplantation surface 5d of the head 5.

構成刷本體2的樹脂例如較佳為使用聚丙烯（Polypropylene，PP）樹脂、或聚縮醛（聚甲醛（Polyoxymethylene，POM））樹脂、聚對苯二甲酸丁二酯（Polybutylene terephthalate，PBT）樹脂、聚對苯二甲酸乙二酯（Polyethylene terephthalate，PET）樹脂等。其中，較佳為使用在本發明的應力分散性與強度方面平衡良好的PP樹脂。The resin constituting the brush body 2 is preferably, for example, polypropylene (PP) resin, or polyacetal (Polyoxymethylene (POM)) resin, or polybutylene terephthalate (PBT) resin. , Polyethylene terephthalate (PET) resin, etc. Among them, it is preferable to use a PP resin having a good balance between stress dispersibility and strength of the present invention.

另外，構成刷本體2的樹脂的彎曲彈性係數（日本工業標準（Japanese Industrial Standards，JIS）K 7171）較佳為1000 MPa～2800 MPa，更佳為1200 MPa～2500 MPa，進而佳為1500 MPa～2000 MPa。In addition, the flexural elastic modulus (Japanese Industrial Standards (JIS) K 7171) of the resin constituting the brush body 2 is preferably 1000 MPa to 2800 MPa, more preferably 1200 MPa to 2500 MPa, and still more preferably 1500 MPa to 2000 MPa.

（刷本體的正面側的形狀） 關於本實施方式的牙刷1，當側面觀察刷本體2時，於刷本體2的正面側，自頭部5的後端側（關於「頭部5的後端側」將於後面敘述）朝向柄部3側具有：第一直線區域S1，自頭部5的植毛面5a連續地向後端側呈直線狀延伸；第一曲線區域E1，於正面側具有曲率中心，自位於第一直線區域S1的後端的第一拐點P1向後端側呈圓弧狀延伸；以及第二曲線區域E2，於背面側具有曲率中心，自位於第一曲線區域E1的後端的第二拐點P2向後端側呈圓弧狀延伸。(The shape of the front side of the brush body) Regarding the toothbrush 1 of this embodiment, when the brush body 2 is viewed from the side, the front side of the brush body 2 is from the rear end side of the head 5 (the "rear end side of the head 5" will be described later) toward the handle The portion 3 side has: a first straight area S1, which extends linearly from the tufting surface 5a of the head 5 continuously to the rear end side; a first curved area E1, which has a center of curvature on the front side, from the rear end of the first straight area S1 The first inflection point P1 extends in an arc shape toward the rear end side; and the second curved area E2 has a center of curvature on the back side and extends in an arc shape from the second inflection point P2 located at the rear end of the first curved area E1 to the rear end side.

第一拐點P1位於頭部5。第二拐點P2形成頸部4與柄部3的邊界。即，比第二拐點P2更靠後端側是柄部3。關於頸部4與柄部3的邊界的第二拐點P2的詳情，將於後面敘述。The first inflection point P1 is located at the head 5. The second inflection point P2 forms the boundary between the neck 4 and the handle 3. In other words, the shank 3 is located closer to the rear end side than the second inflection point P2. The details of the second inflection point P2 of the boundary between the neck 4 and the handle 3 will be described later.

（刷本體的背面側的形狀） 關於本實施方式的牙刷1，當側面觀察刷本體2時，於刷本體2的背面側，自頭部5的後端側朝向柄部3側具有：第二大致直線區域S2，自頭部5的背面連續地向後端側呈直線狀延伸；第三曲線區域E3，於正面側具有曲率中心，自位於第二直線區域S2的後端的第三拐點P3向後端側呈圓弧狀延伸；以及第四曲線區域E4，於背面側具有曲率中心，自位於第三曲線區域E3的後端的第四拐點P4向後端側呈圓弧狀延伸。第三拐點P3位於頭部5。(The shape of the back side of the brush body) Regarding the toothbrush 1 of the present embodiment, when the brush body 2 is viewed from the side, on the back side of the brush body 2, from the rear end side of the head 5 toward the handle 3 side, there is a second substantially linear area S2 from the head 5 The back surface of S2 continuously extends linearly toward the rear end side; the third curved area E3 has a center of curvature on the front side and extends in an arc shape from the third inflection point P3 located at the rear end of the second linear area S2 to the rear end side; and The four-curved area E4 has a center of curvature on the back side, and extends in an arc shape from the fourth inflection point P4 located at the rear end of the third curved area E3 to the rear end side. The third inflection point P3 is located at the head 5.

第四曲線區域E4是於握持柄部3時手指接觸的部分。第四曲線區域E4是於背面側具有曲率中心的圓弧狀，於背面側彎曲成凹形狀，因此手指適合於柄部3，故而提高了握持容易度，提高了臼齒的易刷性。The fourth curved area E4 is the part touched by the fingers when the handle 3 is held. The fourth curved area E4 has an arc shape with a center of curvature on the back side, and is curved into a concave shape on the back side. Therefore, the fingers fit the handle 3, which improves the ease of grip and improves the ease of brushing of the molars.

若將第一曲線區域E1的曲率半徑設為R1、第二曲線區域E2的曲率半徑設為R2、第三曲線區域E3的曲率半徑設為R3、第四曲線區域E4的曲率半徑設為R4，則較佳為滿足R1＜R3、R2＜R4的關係。作為曲率半徑R1，較佳為60 mm以上且150 mm以下。作為曲率半徑R2，較佳為50 mm以上且100 mm以下。作為曲率半徑R3，較佳為80 mm以上且400 mm以下。作為曲率半徑R4，較佳為70 mm以上且200 mm以下。If the radius of curvature of the first curve area E1 is set to R1, the radius of curvature of the second curve area E2 is set to R2, the radius of curvature of the third curve area E3 is set to R3, and the radius of curvature of the fourth curve area E4 is set to R4, It is preferable to satisfy the relationship of R1<R3, R2<R4. The radius of curvature R1 is preferably 60 mm or more and 150 mm or less. The radius of curvature R2 is preferably 50 mm or more and 100 mm or less. The radius of curvature R3 is preferably 80 mm or more and 400 mm or less. The radius of curvature R4 is preferably 70 mm or more and 200 mm or less.

作為曲率半徑R1，較佳為50 mm～250 mm，更佳為60 mm～200 mm，進而佳為60 mm～150 mm。 作為曲率半徑R2，較佳為50 mm～250 mm，更佳為60 mm～200 mm，進而佳為50 mm～100 mm。 作為曲率半徑R3，較佳為50 mm～600 mm，更佳為60 mm～500 mm，進而佳為80 mm～400 mm。 作為曲率半徑R4，較佳為50 mm～400 mm，更佳為60 mm～300 mm，進而佳為70 mm～200 mm。The radius of curvature R1 is preferably 50 mm to 250 mm, more preferably 60 mm to 200 mm, and still more preferably 60 mm to 150 mm. The radius of curvature R2 is preferably 50 mm to 250 mm, more preferably 60 mm to 200 mm, and still more preferably 50 mm to 100 mm. The radius of curvature R3 is preferably 50 mm to 600 mm, more preferably 60 mm to 500 mm, and still more preferably 80 mm to 400 mm. The radius of curvature R4 is preferably 50 mm to 400 mm, more preferably 60 mm to 300 mm, and still more preferably 70 mm to 200 mm.

作為頸部4與柄部3的邊界（P2）的剖面形狀，較佳為大致四邊形、大致多邊形、正圓形、橢圓形，進而佳為橢圓形狀。藉由為所述形狀，換手容易度降低，刷臼齒時的操作性降低。The cross-sectional shape of the boundary (P2) between the neck portion 4 and the shank portion 3 is preferably a substantially quadrangular shape, a substantially polygonal shape, a perfect circle, or an ellipse, and more preferably an elliptical shape. With this shape, the ease of changing hands is reduced, and the operability when brushing molar teeth is reduced.

頸部4與柄部3的邊界處的剖面積較佳為20 mm² ～80 mm² ，更佳為25 mm² ～55 mm² ，進而佳為25 mm² ～45 mm² 以下。藉由為所述範圍內，可確保耐久性。The cross-sectional area at the boundary between the neck 4 and the handle 3 is preferably 20 mm ² to 80 mm ² , more preferably 25 mm ² to 55 mm ² , and still more ^{preferably 25 mm 2} to 45 mm ² or less. By being within the above range, durability can be ensured.

（頭部） 頭部5為藉由多個毛束41對口腔內進行刷掃的部分，其具有形成為大致長方體狀、並且角部帶有圓形的形狀。於圖1、圖4的本實施方式中，頭部5具有：平板部51，位於後端側，於正面側具有作為基準面的植毛面5a；以及傾斜板部52，位於平板部51的前端側。平板部51的植毛面5a與其相反側的背面形成為彼此平坦的面。於側視時平板部51與後述的虛擬線50大致平行。於圖1、圖4的本實施方式中，具有傾斜板部52，但亦可不具有傾斜板部52而僅由平板部51構成。(head) The head 5 is a part for brushing the inside of the oral cavity by a plurality of hair bundles 41, and has a shape formed in a substantially rectangular parallelepiped shape with rounded corners. In the present embodiment of FIGS. 1 and 4, the head 5 has: a flat plate portion 51 located on the rear end side and a tufting surface 5a as a reference surface on the front side; and an inclined plate portion 52 located at the front end of the flat plate portion 51 side. The tufted surface 5a of the flat plate portion 51 and the back surface on the opposite side thereof are formed as mutually flat surfaces. In a side view, the flat plate portion 51 is substantially parallel to a virtual line 50 described later. In the present embodiment shown in FIGS. 1 and 4, the inclined plate portion 52 is provided, but the inclined plate portion 52 may not be provided and only the flat plate portion 51 may be formed.

於具有傾斜板部52的情況下，較佳為隨著朝向前端側而向朝向正面側（即，植毛面側）的方向傾斜。作為傾斜板部52相對於平板部51（於側視時為虛擬線50）傾斜的角度，較佳為5°以上且15°以下的角度。於圖1、圖4的本實施方式中，傾斜板部52相對於平板部51傾斜的角度作為一例為10°。When it has the inclined plate part 52, it is preferable to incline toward the front side (that is, the tufting surface side) as it goes to the front-end|tip side. The angle at which the inclined plate portion 52 is inclined with respect to the flat plate portion 51 (the virtual line 50 in a side view) is preferably an angle of 5° or more and 15° or less. In the present embodiment of FIGS. 1 and 4, the angle at which the inclined plate portion 52 is inclined with respect to the flat plate portion 51 is 10° as an example.

藉由傾斜板部52相對於平板部51傾斜，頭部5的前端的毛束41的毛長變短，與頭部5的後端的毛束41相比毛束難以撓曲，從而毛剛度提高，因此可獲得臼齒的高清掃實感。藉由傾斜板部52的傾斜角度為5°～15°的範圍內，臼齒的清掃實感優異。As the inclined plate portion 52 is inclined with respect to the flat plate portion 51, the hair length of the hair bundle 41 at the front end of the head 5 is shortened, and the hair bundle is harder to bend than the hair bundle 41 at the rear end of the head 5, thereby improving the hair rigidity , So you can get a high-definition scan of the molars. When the inclination angle of the inclined plate portion 52 is in the range of 5° to 15°, the cleaning feeling of the molar tooth is excellent.

如圖3及圖4所示，傾斜板部52具有高度不同的三個植毛面5b～5d。各植毛面5b～5d與植毛面5a平行。植毛面5b～植毛面5d根據傾斜板部52的傾斜而朝向前端側依次變高。另外，如圖1所示，植設於植毛面5b～植毛面5d的毛束41的毛長與植設於植毛面5a的毛束41的毛長為同等高度。 再者，植設於植毛面5b～植毛面5d的毛束41的毛長可低於或高於植設於植毛面5a的毛束41的毛長。As shown in FIGS. 3 and 4, the inclined plate part 52 has three tufted surfaces 5b-5d with different heights. Each tufting surface 5b-5d is parallel to the tufting surface 5a. According to the inclination of the inclined plate part 52, the tufting surface 5b-the tufting surface 5d become higher in order toward the front-end|tip side. In addition, as shown in FIG. 1, the hair length of the tuft 41 planted on the tuft surface 5b-5d is the same height as the hair length of the tuft 41 planted on the tuft surface 5a. Furthermore, the hair length of the tufts 41 planted on the tufting surface 5b to the tufting surface 5d may be lower or higher than the hair length of the tufts 41 planted on the tufting surface 5a.

於植毛面5a～植毛面5d，呈交錯狀排列配置有多個同一直徑的植毛孔6。植毛孔6設置於長軸方向上相鄰的列錯開半個間距排列的位置。毛束藉由以下方式植設於各植毛孔6：將多根刷毛（filament）捆紮並對折，於其中間夾持被稱為平線的金屬製的防脫用具（未圖示）並打入至植毛孔6。On the tufting surface 5a to 5d, a plurality of tufting holes 6 of the same diameter are arranged in a staggered arrangement. The tufting holes 6 are arranged at positions where adjacent rows are staggered by half a pitch in the long axis direction. The tufts are planted in each pore 6 by the following method: multiple filaments (filament) are bundled and folded, and a metal anti-dropping device (not shown) called a flat wire is clamped in the middle and inserted. To transplant pores 6.

再者，植毛孔6不限於呈格子狀排列配置多個的結構，亦可設為呈交錯狀排列配置多個的結構。另外，植毛孔6的內徑與所植入的毛束的根數相關，因此對毛束的硬度或使用感產生影響，雖然可根據植毛時所使用的毛束的粗度或毛長而以某種程度調整使用感，但一般較佳為1.0 mm～3.0 mm的範圍。In addition, the tuft holes 6 are not limited to a structure in which a plurality of pores are arranged in a grid pattern, and may be a structure in which a plurality of holes are arranged in a staggered pattern. In addition, the inner diameter of the tuft hole 6 is related to the number of hair tufts to be implanted, so it affects the hardness or the feeling of use of the tufts, although it can be changed according to the thickness or hair length of the tufts used at the time of tufting. The feeling of use is adjusted to some extent, but it is generally preferably in the range of 1.0 mm to 3.0 mm.

設置於植毛面5a的植毛孔6形成於植毛面5a的法線方向。設置於植毛面5b～植毛面5d的植毛孔6分別相對於植毛面5b～植毛面5d的法線方向，於開口部朝向後端側的方向上，作為一例傾斜5°而形成。The tufting holes 6 provided on the tufting surface 5a are formed in the normal direction of the tufting surface 5a. The tufting holes 6 provided on the tufting surface 5b-the tufting surface 5d are respectively formed by inclining 5° with respect to the normal direction of the tufting surface 5b-the tufting surface 5d in the direction of the opening toward the rear end side, as an example.

於使用平線將毛束41於折疊的狀態下打入至植毛孔進行植毛時，植毛面5a～植毛面5d相對於打入方向正交地配置，因此可穩定地植毛。另外，於植毛孔6相對於打入方向大幅傾斜的情況下（向與傾斜板部52正交的方向傾斜的情況等），毛束41的打入有可能變得不穩定，但設置於植毛面5b～植毛面5d的植毛孔6為於開口部朝向後端側的方向上傾斜5°的程度，因此可無障礙地打入毛束41。When the tufts 41 are driven into the tufting holes in a folded state using a flat thread for tufting, the tufting surfaces 5a to 5d are arranged orthogonal to the driving direction, so that the tufts can be stably tufted. In addition, when the tuft hole 6 is greatly inclined with respect to the driving direction (when it is inclined in a direction orthogonal to the inclined plate portion 52, etc.), the driving of the tuft 41 may become unstable, but it is installed in the tuft The tufting holes 6 of the surface 5b to the tufting surface 5d are inclined by 5° in the direction of the opening toward the rear end side, and therefore, the tufts 41 can be driven in without obstacles.

關於毛束41的刷毛的材質，雖無特別限定，但例如可列舉：聚醯胺（例如：6-12尼龍、6-10尼龍）、聚酯（例如：聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚對苯二甲酸丙二酯（polytrimethylene terephthalate））、聚烯烴（例如：聚丙烯）、彈性體（例如：烯烴系、苯乙烯系）等合成樹脂材料。另外，該些樹脂材料可組合多種來使用，例如，亦可如芯鞘結構等般於芯部與鞘部使用不同的樹脂材料。The material of the bristles of the tuft 41 is not particularly limited, but for example, polyamide (for example: 6-12 nylon, 6-10 nylon), polyester (for example: polyethylene terephthalate, Synthetic resin materials such as polybutylene terephthalate, polytrimethylene terephthalate), polyolefin (for example: polypropylene), elastomers (for example: olefin-based, styrene-based). In addition, these resin materials can be used in combination of multiple types. For example, different resin materials can be used for the core and sheath as in the core-sheath structure.

另外，作為構成毛束41的刷毛，例如可列舉其直徑朝向毛尖逐漸變小且毛尖被銳化的牙刷毛（錐形（taper）毛）、其直徑自植毛面5a朝向毛尖大致相同的牙刷毛（直（straight）毛）等。作為直毛，可列舉毛尖為與植毛面5a大致平行的平面者、或毛尖被揉成半球狀者。 構成植設於植毛面5b～植毛面5d的毛束41的刷毛較佳為錐形毛或直毛。 構成植設於植毛面5a的毛束41的刷毛較佳為錐形毛或直毛。 植毛面5a～植毛面5d中的任一者的前端可經切毛剪切。In addition, as the bristles constituting the bristle bundle 41, for example, toothbrush bristles (taper bristles) whose diameter is gradually reduced toward the tip of the bristles (taper bristles), and toothbrush bristles whose diameter is approximately the same from the implanted surface 5a toward the tip of the bristles can be cited (Straight hair) and so on. Examples of straight hairs include those whose hair tips are in a plane substantially parallel to the tufted surface 5a, or those whose hair tips are kneaded into a hemispherical shape. The bristles constituting the tuft 41 planted on the tufting surface 5b to the tufting surface 5d are preferably tapered bristles or straight bristles. The bristles constituting the tuft 41 planted on the tufting surface 5a are preferably tapered bristles or straight bristles. The tip of any one of the tufted surface 5a to 5d may be trimmed.

刷毛的橫剖面形狀通常為圓形，但並不限定於此種形狀，例如可設為橢圓形、三角形、四邊形、六邊形、星形、三片葉的三葉草形、四片葉的三葉草形等任意的形狀。The cross-sectional shape of the bristles is usually circular, but is not limited to this shape. For example, it can be oval, triangle, quadrilateral, hexagon, star, three-leaf clover, or four-leaf clover. And other arbitrary shapes.

毛束41的毛長較佳為自頭部5的植毛面5a起，在成人用途中設為8 mm～13 mm，在兒童用途中設為6 mm～9 mm。就口腔內的使用性或使用感的方面而言，刷毛的粗度（最大直徑）較佳為0.12 mm～0.26 mm。另外，考慮到使用感、或刷掃感、清掃效果、耐久性等，亦可將粗度不同的多根刷毛任意組合來使用。The hair length of the hair bundle 41 is preferably set to be 8 mm to 13 mm for adult use, and 6 mm to 9 mm for children use from the transplanted surface 5a of the head 5. In terms of usability and usability in the oral cavity, the thickness (maximum diameter) of the bristles is preferably 0.12 mm to 0.26 mm. In addition, in consideration of usability, brushing sensation, cleaning effect, durability, etc., a plurality of bristles with different thicknesses can be used in any combination.

作為毛束41的植毛方法，除了將所述刷毛的毛束對折，於其中間夾持平線並植設於植毛孔6的平線植毛法以外，亦可使用如下方法：將毛束的下端壓入至成為頭部5的熔融樹脂中並加以固定的熱熔接法、或者將毛束的下端加熱並形成熔融塊之後，將熔融樹脂填充於模具的腔內而與頭部5一體成形的模內（in-mold）法等。As the method of transplanting the hair bundle 41, in addition to the flat thread transplanting method in which the hair bundle of the bristles is folded in half, and the flat thread is sandwiched in the middle and planted in the transplanting hole 6, the following method can also be used: pressing the lower end of the hair bundle Into the molten resin that becomes the head 5 and fix it by thermal welding, or heat the lower end of the tuft to form a molten mass, and then fill the cavity of the mold with molten resin to form an integral mold with the head 5 (In-mold) method and so on.

頭部5具有俯視時四個頂部被曲線切角的大致四邊形的平板狀的形狀。本實施方式中，頭部5與頸部4的邊界O為頭部5的俯視形狀中的形成靠近頸部4的切角的曲線的終點，即為形成切角的曲線的彎曲方向發生變化的位置。因此，頭部5與頸部4的邊界O為自俯視時的頭部5中的形成靠近頸部4的切角部分的寬度變窄的兩邊緣的曲線或直線，變化成寬度擴大的曲線的位置。The head 5 has a substantially quadrilateral flat plate shape with four tops cut by a curve in a plan view. In the present embodiment, the boundary O between the head 5 and the neck 4 is the end point of the curve forming the chamfer close to the neck 4 in the top view shape of the head 5, that is, the bending direction of the curve forming the chamfer changes. Location. Therefore, the boundary O between the head 5 and the neck 4 is a curve or a straight line that changes from the two edges of the head 5 where the width of the chamfered portion close to the neck 4 is narrowed into a curve with an enlarged width when viewed from above. Location.

再者，頭部5只要為容易對口腔內進行刷掃的形狀或大小即可，其形狀並無特別限定，例如亦可設為自其基端側朝向前端側寬度逐漸變窄的形狀。另外，頭部5可為自其基端側朝向前端側厚度逐漸變薄的錐形形狀，亦可為頭部5的背面側的中央部具有***的圓形的形狀。In addition, the head 5 may have a shape or size that facilitates brushing of the oral cavity, and its shape is not particularly limited. For example, it may have a shape whose width gradually narrows from the base end side toward the distal end side. In addition, the head 5 may have a tapered shape in which the thickness gradually becomes thinner from the base end side toward the front end side, or may have a round shape in which the central part of the back side of the head 5 has a bulge.

頭部5的厚度較佳為2 mm以上且小於4 mm，更佳為2.5 mm～3.5 mm。再者，於頭部5的厚度並非一定的情況下，將頭部5的厚度定義為頭部5的最大厚度。 於頭部5的厚度小於2 mm的情況下，耐久性有可能降低。於頭部5的厚度為4 mm以上的情況下，向臼齒的***性或操作性有可能降低。藉由將頭部5的厚度設為2 mm以上且小於4 mm，可於不降低耐久性的情況下提高向臼齒的***性或操作性。The thickness of the head 5 is preferably 2 mm or more and less than 4 mm, more preferably 2.5 mm to 3.5 mm. Furthermore, when the thickness of the head 5 is not constant, the thickness of the head 5 is defined as the maximum thickness of the head 5. In the case where the thickness of the head 5 is less than 2 mm, the durability may be reduced. When the thickness of the head 5 is 4 mm or more, the insertability or operability into the molar teeth may be reduced. By setting the thickness of the head 5 to be 2 mm or more and less than 4 mm, it is possible to improve the insertability or operability into the molars without reducing durability.

（頸部） 頸部4為將柄部3與頭部5之間連結的部分。 本實施方式中，俯視及側視時的頸部4與柄部3的外形形狀為自頭部5與頸部4的邊界O朝向柄部3側平緩的曲線連接多個而成的形狀。而且，於側視時，將平緩的曲線的彎曲方向反轉的位置作為頸部4與柄部3的邊界。即，於圖1的側視時，將正面側的頸部4的曲線自邊界O朝向柄部3側、正面側具有曲率中心的第一直線區域S1的曲率中心向背面側開始變化的位置（第二拐點P2）作為頸部4與柄部3的邊界。(neck) The neck 4 is a part that connects the handle 3 and the head 5. In this embodiment, the outer shape of the neck 4 and the shank 3 in a plan view and a side view is a shape formed by connecting a plurality of gentle curves from the boundary O of the head 5 and the neck 4 to the shank 3 side. In addition, in a side view, the position where the bending direction of the gentle curve is reversed is defined as the boundary between the neck 4 and the shank 3. That is, in the side view of FIG. 1, the curve of the neck 4 on the front side is directed from the boundary O to the shank 3 side, and the center of curvature of the first straight line region S1 having the center of curvature on the front side starts to change toward the back side (the position where The second inflection point P2) serves as the boundary between the neck 4 and the handle 3.

將頸部4的長軸方向的長度定義為側視時的拐點P2的位置與邊界O的最短距離。 頸部4的長度較佳為25 mm～45 mm，進而佳為25 mm～40 mm。 藉由將頸部4的長度設為所述範圍內，可提高向臼齒的***性及臼齒的清掃時的操作性。The length in the major axis direction of the neck 4 is defined as the shortest distance between the position of the inflection point P2 and the boundary O in a side view. The length of the neck 4 is preferably 25 mm to 45 mm, and more preferably 25 mm to 40 mm. By setting the length of the neck 4 within the above-mentioned range, the insertability into the molar teeth and the operability during cleaning of the molar teeth can be improved.

頸部4的剖面形狀較佳為大致四邊形、大致多邊形、正圓形、橢圓形，進而佳為橢圓形狀。更佳為厚度方向為長徑的橢圓狀。 頸部4的厚度自前端側朝向後端側連續增加。藉由使頸部4的厚度連續增加，與頸部4的厚度一定的情況相比，可增大頸部4的強度。另外，頸部4的厚度自前端側朝向後端側連續增加，藉此***至口腔內時嘴唇的張開不會變大，可確保口腔內的操作性。此外，由於刷牙時施加於頸部4的應力集中的位置設置於頭部5側，因此可充分確保後述的使應力於柄部3方向分散的距離，從而可抑制頸部4的過度撓曲。The cross-sectional shape of the neck 4 is preferably a substantially quadrilateral, a substantially polygonal, a perfect circle, or an ellipse, and more preferably an ellipse. More preferably, the thickness direction is an elliptical shape with a major axis. The thickness of the neck 4 continuously increases from the front end side toward the rear end side. By continuously increasing the thickness of the neck 4, the strength of the neck 4 can be increased compared with the case where the thickness of the neck 4 is constant. In addition, the thickness of the neck 4 continuously increases from the front end side toward the rear end side, so that the opening of the lips does not increase when inserted into the oral cavity, and the operability in the oral cavity can be ensured. In addition, since the position where the stress applied to the neck 4 is concentrated when brushing teeth is provided on the head 5 side, it is possible to sufficiently ensure a distance for dispersing the stress in the shank 3 direction, which will be described later, so that excessive deflection of the neck 4 can be suppressed.

作為頸部的最小厚度，較佳為3.0 mm～4.0 mm，更佳為3.0 mm～3.6 mm。 作為頸部的最小寬度，較佳為3.0 mm～4.5 mm，更佳為3.5 mm～4.2 mm。 作為頸部4的最小徑，較佳為3.0 mm～4.0 mm，更佳為3.0 mm～3.6 mm。 於頸部的最小厚度、頸部的最小寬度及頸部4的最小徑小於3.0 mm的情況下，頸部4容易撓曲，操作性有可能降低。於頸部的最小厚度、頸部的最小寬度及頸部4的最小徑超過4.0 mm時，口腔內的操作性有可能降低。 藉由將頸部的最小厚度、頸部的最小寬度及頸部4的最小徑設為3.0 mm以上且4.0 mm以下，可確保操作性。 另外，頸部的最小厚度為3.0 mm～4.0 mm的長度較佳為5 mm以上，更佳為6 mm以上，進而佳為7 mm以上。 頸部的最小寬度為3.0 mm～4.5 mm的長度較佳為5 mm以上，更佳為6 mm以上，進而佳為7 mm以上。 頸部的最小徑為3.0 mm～4.0 mm的長度較佳為5 mm以上，更佳為6 mm以上，進而佳為7 mm以上。 藉由為所述範圍內，可提高向臼齒的深處的***性與操作性。The minimum thickness of the neck is preferably 3.0 mm to 4.0 mm, more preferably 3.0 mm to 3.6 mm. The minimum width of the neck is preferably 3.0 mm to 4.5 mm, more preferably 3.5 mm to 4.2 mm. The minimum diameter of the neck 4 is preferably 3.0 mm to 4.0 mm, more preferably 3.0 mm to 3.6 mm. When the minimum thickness of the neck, the minimum width of the neck, and the minimum diameter of the neck 4 are less than 3.0 mm, the neck 4 is easily flexed, and the operability may be reduced. When the minimum thickness of the neck, the minimum width of the neck, and the minimum diameter of the neck 4 exceed 4.0 mm, the operability in the oral cavity may be reduced. By setting the minimum thickness of the neck, the minimum width of the neck, and the minimum diameter of the neck 4 to 3.0 mm or more and 4.0 mm or less, operability can be ensured. In addition, the length of the neck with a minimum thickness of 3.0 mm to 4.0 mm is preferably 5 mm or more, more preferably 6 mm or more, and still more preferably 7 mm or more. The length of the neck with a minimum width of 3.0 mm to 4.5 mm is preferably 5 mm or more, more preferably 6 mm or more, and still more preferably 7 mm or more. The length of the neck with a minimum diameter of 3.0 mm to 4.0 mm is preferably 5 mm or more, more preferably 6 mm or more, and still more preferably 7 mm or more. By being within the above range, the insertability and operability into the deep part of the molar tooth can be improved.

如上所述，由於形成側視時的頸部4的正面側的第一曲線區域E1與形成側視時的頸部4的背面側的第三曲線區域E3均為於正面側具有曲率中心的圓弧狀，因此沿著齒列的曲線，從而可提高刷臼齒的臉頰側時的***性。As described above, since the first curved area E1 on the front side of the neck 4 in side view and the third curved area E3 on the back side of the neck 4 in side view are both circles with the center of curvature on the front side. It has an arc shape, so it follows the curve of the dentition, which improves the insertability when brushing the cheek side of the molars.

頸部4的傾斜角度θ由貫穿側視時的位於最後端側的植毛孔6的後端側緣部與第二拐點P2的直線和圖1所示的虛擬線50交差的角度所表示。虛擬線50是貫穿於側視時位於最後端側的植毛孔6的後端側緣部Q1與第二個位於後端側的植毛孔6的後端側緣部Q2的直線。Q1與Q2於一般的牙刷中與頭部的後端側的植毛面平行。 作為頸部4的傾斜角度，較佳為8°以上且25°以下。The inclination angle θ of the neck 4 is represented by the angle at which a straight line passing through the rear end side edge of the graft hole 6 located on the rearmost end side in a side view and the second inflection point P2 intersects with the virtual line 50 shown in FIG. 1. The virtual line 50 is a straight line passing through the rear end side edge Q1 of the tuft hole 6 located on the rearmost end side in a side view and the rear end side edge Q2 of the second tuft hole 6 located on the rear end side. Q1 and Q2 are parallel to the tufting surface on the rear end side of the head in a general toothbrush. The inclination angle of the neck 4 is preferably 8° or more and 25° or less.

於頸部4的傾斜角度小於8°的情況下，於刷臼齒的臉頰側時，需要將嘴唇橫向張開很大，***性或操作性有可能降低。於頸部4的傾斜角度超過25°的情況下，於變更刷牙部位時，由於需要大幅度地彎曲手腕的動作，因此刷臼齒時的操作性有可能降低。藉由將頸部4的傾斜角度設為8°以上且25°以下，可確保刷臼齒的臉頰側時的***性或操作性、以及變更刷牙部位時的操作性。In the case where the inclination angle of the neck 4 is less than 8°, when brushing the cheek side of the molars, the lips need to be widened laterally, which may reduce the insertability or operability. In the case where the inclination angle of the neck 4 exceeds 25°, when changing the tooth brushing position, the wrist needs to be bent greatly, so the operability when brushing the molar teeth may be reduced. By setting the inclination angle of the neck 4 to 8° or more and 25° or less, it is possible to ensure the insertability and operability when brushing the cheek side of the molar teeth, and the operability when changing the tooth brushing site.

作為側視時的第二拐點P2與虛擬線50的最短距離，較佳為5 mm以上且15 mm以下，更佳為8 mm以上且12 mm以下。藉此，可確保S字形狀，可提高口腔內***性與使用感。 作為側視時的與第二拐點P2相向的「背面側的P2'」和虛擬線50的最短距離，較佳為1 mm以上且3 mm以下，更佳為1.5 mm以上且3 mm以下。藉此，可確保S字形狀，可提高口腔內***性與使用感。As the shortest distance between the second inflection point P2 and the virtual line 50 in a side view, it is preferably 5 mm or more and 15 mm or less, and more preferably 8 mm or more and 12 mm or less. Thereby, the S shape can be ensured, and the insertability in the oral cavity and the feeling of use can be improved. The shortest distance between "P2' on the back side" facing the second inflection point P2 in a side view and the virtual line 50 is preferably 1 mm or more and 3 mm or less, and more preferably 1.5 mm or more and 3 mm or less. Thereby, the S shape can be ensured, and the insertability in the oral cavity and the feeling of use can be improved.

如上所述，專利文獻1中揭示的牙刷是背面側的頸部的形狀為於頭部與頸部的邊界附近暫時向背面側翹曲後向植毛面側翹曲的S字形狀的牙刷，因此於***口腔內時頸部的背面側與臉頰接觸而有可能降低使用感。另一方面，於本實施方式中，如圖1所示，側視時的頭部與頸部的背面側的形狀自第三拐點向正面側彎曲，形成正面側具有曲率中心的第三曲線區域E3。即，於頭部與頸部的邊界附近不具有暫時向背面側翹曲的形狀。因此，於***口腔內時，可減輕頸部的背面側與臉頰的接觸，從而提高使用感。 進而，藉由將頭部5的厚度減薄至2 mm～4 mm，且將頸部的厚度、寬度、直徑減細至3.0 mm～4.5 mm，將其長軸方向的長度設為5 mm以上，可進一步提高***性、使用感及操作性。 此外，即使將頸部4的長度縮短至25 mm～45 mm，第一直線區域S1、於正面側具有曲率中心的第一曲線區域E1、於背面側具有曲率中心的第二曲線區域E2利用拐點P1、拐點P2以緩和的曲線連接，藉此可進一步提高使用感與操作性。As described above, the toothbrush disclosed in Patent Document 1 is an S-shaped toothbrush whose neck shape on the back side is temporarily warped to the back side near the boundary between the head and the neck and then warped to the tufting surface side. When it is inserted into the mouth, the back side of the neck is in contact with the cheeks, which may reduce the feeling of use. On the other hand, in this embodiment, as shown in FIG. 1, the shape of the back side of the head and neck in a side view is curved from the third inflection point to the front side, forming a third curved area with a center of curvature on the front side. E3. That is, it does not have a shape that is temporarily warped to the back side in the vicinity of the boundary between the head and the neck. Therefore, when it is inserted into the oral cavity, the contact between the back side of the neck and the cheek can be reduced, thereby improving the feeling of use. Furthermore, by reducing the thickness of the head 5 to 2 mm to 4 mm, and the thickness, width, and diameter of the neck to 3.0 mm to 4.5 mm, the length in the major axis direction is set to 5 mm or more , Can further improve the insertability, feeling of use and operability. In addition, even if the length of the neck 4 is shortened to 25 mm to 45 mm, the first straight line region S1, the first curved region E1 with the center of curvature on the front side, and the second curved region E2 with the center of curvature on the back side utilize the inflection point P1. , The inflection point P2 is connected with a gentle curve, which can further improve the sense of use and operability.

（柄部） 柄部3為由使用者握持的部分，形成為長條柱狀。為了確保足以握持該柄部3來使用的長度，較佳為將俯視時的自邊界O至柄部3的後端為止的長度設為100 mm～200 mm。(Handle) The handle 3 is a part held by the user, and is formed in a long columnar shape. In order to ensure a length sufficient to hold the handle 3 for use, it is preferable to set the length from the boundary O to the rear end of the handle 3 in a plan view to 100 mm to 200 mm.

本實施方式中，柄部3於側面觀察刷本體2時具有的形狀為：自其前端側（第二拐點P2側）朝向後端側厚度（第二曲線區域E2與第四曲線區域E4的距離）連續增加，於到達最大厚度後，厚度隨著朝向其後端側而減少。In this embodiment, the handle 3 has a shape when the brush body 2 is viewed from the side: the thickness from the front end side (the second inflection point P2 side) to the rear end side (the distance between the second curve area E2 and the fourth curve area E4) ) Continuously increase. After reaching the maximum thickness, the thickness decreases toward the rear end side.

再者，於柄部3中存在多個成為最大厚度的部位的情況下，將位於最靠近頸部4側的位置的部位唯一地定義為柄部3的成為最大厚度的部位。圖1中，成為柄部3的最大厚度的部位為柄部3Amax。In addition, when there are a plurality of parts having the largest thickness in the shank 3, the part located closest to the neck 4 side is uniquely defined as the part of the shank 3 that has the largest thickness. In FIG. 1, the part which becomes the largest thickness of the shank part 3 is the shank part 3Amax.

柄部3的側視時的正面側的面與虛擬線50的距離最長的長軸方向的位置P11（即，於側視時位置P11相對於虛擬線50成為最大高度）位於比柄部3的長軸方向的中央更靠前端側的柄部3A。即，於比柄部3的長軸方向的長度的中央位置更靠頭部前端側的位置具有位置P11。於側視時以位置P11為邊界，將頭部前端側設為柄部3A，將柄部後端側設為柄部3B。於柄部3中，為了進行毛尖的細微控制，較佳為側視時的正面側的面的位置接近毛束41的前端的位置。The position P11 in the long axis direction where the distance between the front surface of the shank 3 and the virtual line 50 in side view is the longest (that is, the position P11 becomes the maximum height with respect to the imaginary line 50 in side view) is located higher than that of the shank 3 The center in the longitudinal direction is closer to the handle 3A on the tip side. That is, it has a position P11 at a position closer to the front end of the head than the center position of the length of the handle 3 in the long axis direction. In a side view, with the position P11 as the boundary, the front end side of the head is referred to as the handle 3A, and the rear end side of the handle is referred to as the handle 3B. In the handle 3, in order to perform fine control of the hair tips, it is preferable that the position of the front side surface in a side view is close to the position of the tip of the hair bundle 41.

此處，位置P11與虛擬線50的距離比毛束41的前端長。另一方面，作為柄部3（柄部3A）的前端的第二拐點P2與虛擬線50的距離比毛束41的前端短。另外，柄部3（柄部3B）的後端與虛擬線50的距離比毛束41的前端長。即，關於柄部3的正面側的面，位置P11與第二拐點P2之間的區域相對於毛束41的前端的位置的變化大，與此相對，位置P11與後端之間的區域相對於毛束41的前端的位置的變化小，適合於毛尖的細微控制。因此，藉由位置P11位於柄部3A，適合於毛尖的細微控制的區域變長，即使於握持柄部3的後端側的情況下亦可容易地刷臼齒。Here, the distance between the position P11 and the virtual line 50 is longer than the tip of the hair bundle 41. On the other hand, the distance between the second inflection point P2 that is the tip of the handle 3 (the handle 3A) and the virtual line 50 is shorter than the tip of the hair bundle 41. In addition, the distance between the rear end of the handle 3 (the handle 3B) and the virtual line 50 is longer than the front end of the hair bundle 41. That is, with respect to the front side surface of the handle 3, the area between the position P11 and the second inflection point P2 has a large change with respect to the position of the front end of the tuft 41, and on the other hand, the area between the position P11 and the rear end is opposite The change in the position of the tip of the hair bundle 41 is small, and it is suitable for fine control of the hair tip. Therefore, since the position P11 is located at the handle 3A, the area suitable for the fine control of the hair tips becomes longer, and the molar teeth can be easily brushed even when the rear end side of the handle 3 is held.

作為側視時的柄部3的正面側的面的位置P11與虛擬線50的最短距離，較佳為20 mm以上且32 mm以下，更佳為22 mm以上且26 mm以下。 於位置P11與虛擬線50的距離小於20 mm的情況下、或者位置P11與虛擬線50的距離超過32 mm的情況下，於柄部3的後端，側視時的正面側的面的位置自毛束41的前端大幅偏離，毛尖的控制性有可能降低。 於側視時的柄部3的正面側的面的位置P11，和於與虛擬線50垂直的方向上延伸並與位置P11相向的背面側面的交點即位置p11'與虛擬線50的最短距離較佳為8 mm以上且12 mm以下，更佳為10 mm以上且12 mm以下。藉此，可確保S字形狀，可提高口腔內***性與使用感。As the shortest distance between the position P11 of the front surface of the handle 3 in a side view and the virtual line 50, it is preferably 20 mm or more and 32 mm or less, and more preferably 22 mm or more and 26 mm or less. When the distance between the position P11 and the imaginary line 50 is less than 20 mm, or when the distance between the position P11 and the imaginary line 50 exceeds 32 mm, the position of the front surface at the rear end of the handle 3 when viewed from the side A large deviation from the tip of the hair bundle 41 may reduce the controllability of the hair tip. In a side view, the position P11 of the front side surface of the handle 3 and the intersection point of the back side surface extending in the direction perpendicular to the virtual line 50 and facing the position P11, that is, the shortest distance between the position p11' and the virtual line 50 It is preferably 8 mm or more and 12 mm or less, and more preferably 10 mm or more and 12 mm or less. Thereby, the S shape can be ensured, and the insertability in the oral cavity and the feeling of use can be improved.

另外，柄部3的背面側較佳為直至柄部的末端部為止不與虛擬線50相交的形狀。 側視時的柄部的末端部側的柄部3B的背面側的面與虛擬線50的最短距離較佳為8 mm以上且20 mm以下，較佳為10 mm以上且15 mm以下。 側視時的柄部的最末端部與虛擬線50的最短距離較佳為8 mm以上且20 mm以下，更佳為12 mm以上且18 mm以下。 藉此，可確保S字形狀，可提高口腔內***性與使用感。 另外，側視時的連接邊界O與位置P11的線段的最短距離較佳為70 mm～110 mm，更佳為80 mm～110 mm，進而佳為80 mm～100 mm，尤佳為90 mm～100 mm。 另外，側視時的連接拐點P2與位置P11的線段的最短距離較佳為40 mm～80 mm，更佳為50 mm～70 mm。In addition, the back side of the shank 3 is preferably a shape that does not intersect the virtual line 50 up to the end of the shank. The shortest distance between the surface on the back side of the shank 3B on the tip side of the shank and the virtual line 50 in a side view is preferably 8 mm or more and 20 mm or less, and more preferably 10 mm or more and 15 mm or less. The shortest distance between the most distal part of the handle and the virtual line 50 in a side view is preferably 8 mm or more and 20 mm or less, and more preferably 12 mm or more and 18 mm or less. Thereby, the S shape can be ensured, and the insertability in the oral cavity and the feeling of use can be improved. In addition, the shortest distance between the line segment connecting the boundary O and the position P11 in a side view is preferably 70 mm～110 mm, more preferably 80 mm～110 mm, still more preferably 80 mm～100 mm, particularly preferably 90 mm～ 100 mm. In addition, the shortest distance of the line segment connecting the inflection point P2 and the position P11 in a side view is preferably 40 mm to 80 mm, and more preferably 50 mm to 70 mm.

柄部3的剖面形狀較佳為大致四邊形、大致多邊形、正圓形、橢圓形，進而佳為橢圓形狀。進而，更佳為以寬度方向為長徑的橢圓狀。 柄部3的厚度於柄部3A中最大。柄部3A中的最大厚度較佳為9 mm以上且14 mm以下，更佳為10.5 mm以上且12.5 mm以下。The cross-sectional shape of the handle 3 is preferably a substantially quadrilateral, a substantially polygonal, a perfect circle, or an ellipse, and more preferably an ellipse. Furthermore, it is more preferable that it is an elliptical shape with a width direction as a long diameter. The thickness of the handle 3 is the largest in the handle 3A. The maximum thickness in the shank 3A is preferably 9 mm or more and 14 mm or less, more preferably 10.5 mm or more and 12.5 mm or less.

另外，柄部3的寬度於柄部3A中最大。柄部3A的最大寬度較佳為11 mm以上且16 mm以下，更佳為12.5 mm以上且14.5 mm以下。 藉此，可使柄部3的握持性變良好，從而獲得由掌握等帶來的優異的操作性。 較佳為於柄部3A具有最大厚度及最大寬度。藉此，可確保S字形狀，提高口腔內***性與使用感，同時使柄部3的握持性變良好，從而獲得由掌握等帶來的優異的操作性。 作為側視時的柄部3的成為最大厚度的位置（柄部3Amax）與虛擬線50的最短距離，較佳為20 mm以上且32 mm以下，更佳為22 mm以上且26 mm以下。 於側視時的柄部3的成為最大厚度的位置（柄部3Amax），和於與虛擬線50垂直的方向上延伸並與柄部3Amax相向的背面側的面的交點、即柄部3Amax'與虛擬線50的最短距離較佳為8 mm以上且12 mm以下，更佳為10 mm以上且12 mm以下。藉此，可確保S字形狀，提高口腔內***性與使用感，同時使柄部3的握持性變良好，從而獲得由掌握等帶來的優異的操作性。In addition, the width of the handle 3 is the largest in the handle 3A. The maximum width of the handle 3A is preferably 11 mm or more and 16 mm or less, more preferably 12.5 mm or more and 14.5 mm or less. Thereby, the grip of the handle 3 can be improved, and excellent operability due to grasping and the like can be obtained. It is preferable that the handle 3A has the largest thickness and the largest width. Thereby, it is possible to ensure the S-shaped shape, improve the insertability in the oral cavity and the feeling of use, and at the same time improve the grip of the handle 3, thereby obtaining excellent operability due to grasping and the like. As the shortest distance between the position of the maximum thickness of the shank 3 (the shank 3Amax) and the virtual line 50 in a side view, it is preferably 20 mm or more and 32 mm or less, and more preferably 22 mm or more and 26 mm or less. The position of the maximum thickness of the shank 3 in a side view (the shank 3Amax) and the intersection of the back side surface extending in the direction perpendicular to the virtual line 50 and facing the shank 3Amax, that is, the shank 3Amax' The shortest distance from the virtual line 50 is preferably 8 mm or more and 12 mm or less, more preferably 10 mm or more and 12 mm or less. Thereby, it is possible to ensure the S-shaped shape, improve the insertability in the oral cavity and the feeling of use, and at the same time improve the grip of the handle 3, thereby obtaining excellent operability due to grasping and the like.

柄部3的最大厚度相對於柄部3的最大寬度的比率（柄部3的最大厚度/柄部3的最大寬度）較佳為0.6以上且1.3以下，更佳為0.7以上且1.0以下。The ratio of the maximum thickness of the shank 3 to the maximum width of the shank 3 (the maximum thickness of the shank 3/the maximum width of the shank 3) is preferably 0.6 or more and 1.3 or less, more preferably 0.7 or more and 1.0 or less.

柄部3的最大厚度相對於頭部5的最大厚度的比率（柄部3的最大厚度/頭部5的最大厚度）較佳為2.3以上且7.0以下，更佳為2.8以上且4.2以下。The ratio of the maximum thickness of the shank 3 to the maximum thickness of the head 5 (the maximum thickness of the shank 3/the maximum thickness of the head 5) is preferably 2.3 or more and 7.0 or less, more preferably 2.8 or more and 4.2 or less.

柄部3的最大厚度相對於頸部4的最小厚度的比率（柄部3的最大厚度/頸部4的最小厚度）較佳為2.0以上且5.6以下，更佳為2.6以上且4.8以下。The ratio of the maximum thickness of the shank 3 to the minimum thickness of the neck 4 (the maximum thickness of the shank 3/the minimum thickness of the neck 4) is preferably 2.0 or more and 5.6 or less, more preferably 2.6 or more and 4.8 or less.

柄部3的剖面積於柄部3A中最大。柄部3的剖面積較佳為70 mm² 以上且200 mm² 以下，更佳為90 mm² 以上且150 mm² 以下。The cross-sectional area of the handle 3 is the largest in the handle 3A. The cross-sectional area of the handle 3 is preferably 70 mm ² or more and 200 mm ² or less, more preferably 90 mm ² or more and 150 mm ² or less.

於本實施方式的牙刷1中，第一拐點P1位於頭部5，於其後端側具有第二拐點P2。於刷本體2的側視（圖1）時，自正面側（圖2）觀察第一拐點P1與第二拐點P2時的連接拐點P1與拐點P2的最短距離較佳為28 mm以上且40 mm以下，更佳為30 mm以上且35 mm以下。藉此，於頸部4的厚度自頭部5朝向柄部3連續增加的形狀中，可將頭部5與柄部3之間的表面經由頸部4以平滑的曲線連續地連接。另外，可設為使頸部4遍及全長而更細的形狀。In the toothbrush 1 of this embodiment, the 1st inflection point P1 is located in the head part 5, and the 2nd inflection point P2 is provided in the back end side. When the brush body 2 is viewed from the side (Figure 1), the shortest distance connecting the inflection point P1 and the inflection point P2 when viewing the first inflection point P1 and the second inflection point P2 from the front side (Figure 2) is preferably 28 mm or more and 40 mm Below, it is more preferably 30 mm or more and 35 mm or less. Thereby, in the shape where the thickness of the neck 4 continuously increases from the head 5 toward the handle 3, the surface between the head 5 and the handle 3 can be continuously connected in a smooth curve via the neck 4. In addition, the neck 4 may be made thinner over the entire length.

於本實施方式的牙刷1中，第一拐點P1位於頭部5，於其後端側具有第二拐點P2。於刷本體2的俯視時，第一拐點P1與第二拐點P2之間的距離較佳為28 mm以上且45 mm以下，更佳為28 mm以上且41 mm以下，進而佳為30 mm以上且40 mm以下。 藉此，於頸部4的厚度自頭部5朝向柄部3連續增加的形狀中，可將頭部5與柄部3之間的表面經由頸部4以平滑的曲線連續地連接。另外，可設為使頸部4遍及全長而更細的形狀。In the toothbrush 1 of this embodiment, the 1st inflection point P1 is located in the head part 5, and the 2nd inflection point P2 is provided in the back end side. In the top view of the brush body 2, the distance between the first inflection point P1 and the second inflection point P2 is preferably 28 mm or more and 45 mm or less, more preferably 28 mm or more and 41 mm or less, and more preferably 30 mm or more and Below 40 mm. Thereby, in the shape where the thickness of the neck 4 continuously increases from the head 5 toward the handle 3, the surface between the head 5 and the handle 3 can be continuously connected in a smooth curve via the neck 4. In addition, the neck 4 may be made thinner over the entire length.

於本實施方式的牙刷1中，由於具有薄頭部5、細頸部4及粗柄部3，因此若於刷牙時對頭部5施加負荷，則首先應力經由正面側的第一大致直線區域S1集中於第一拐點P1。第一拐點P1處於與背面側的第二大致直線區域S2內相向的位置。因此，於第二大致直線區域S2，若欲將於該第一拐點P1處在背面方向受到的應力分散，則阻力（排斥力）於正面方向起作用。In the toothbrush 1 of the present embodiment, since it has a thin head 5, a thin neck 4, and a thick handle 3, if a load is applied to the head 5 during brushing, the stress first passes through the first substantially straight area on the front side. S1 is concentrated at the first inflection point P1. The first inflection point P1 is at a position facing the inside of the second substantially straight region S2 on the back side. Therefore, in the second substantially straight region S2, if the stress received in the back direction at the first inflection point P1 is to be dispersed, the resistance (repulsive force) acts in the front direction.

於第一拐點P1處在背面方向的應力集中起作用的情況下，若與第一拐點P1相向的區域為大致直線形狀（第二大致直線區域S2），則於第二大致直線區域S2，阻力於正面側起作用。而且，該阻力向與第二大致直線區域S2相向的正面側的第一曲線區域E1傳遞。When the stress concentration in the back direction at the first inflection point P1 acts, if the area facing the first inflection point P1 has a substantially linear shape (the second substantially straight area S2), the resistance is Works on the front side. Then, the resistance is transmitted to the first curved area E1 on the front side facing the second substantially straight area S2.

另外，若於刷本體2的正面側設置具有曲率中心的第一曲線區域E1，則於第一拐點P1處背面方向的應力集中起作用的情況下，根據其彎曲形狀的性質，具有阻力容易於正面側起作用的性質。此外，第一曲線區域E1的曲率半徑越大，阻力越容易分散傳遞。In addition, if the first curved area E1 having the center of curvature is provided on the front side of the brush body 2, when the stress concentration in the back direction at the first inflection point P1 acts, it is easy to have resistance due to the nature of the curved shape. The nature of the front side. In addition, the larger the radius of curvature of the first curved area E1, the easier the resistance is distributed and transmitted.

另外，若於刷本體2的背面側設置於正面側具有曲率中心的第三曲線區域E3，則於背面方向的應力傳遞至第三拐點P3的情況下，根據其彎曲形狀的性質，於第三曲線區域E3，阻力容易於正面側起作用。此外，第三曲線區域E3的曲率半徑越大，阻力越容易分散傳遞。In addition, if the third curved region E3 having the center of curvature on the front side is provided on the back side of the brush body 2, when the stress in the back direction is transmitted to the third inflection point P3, according to the nature of the curved shape, the third curve region E3 In the curved area E3, resistance is likely to act on the front side. In addition, the larger the radius of curvature of the third curved area E3, the easier the resistance is distributed and transmitted.

於刷本體2的側視時，第二拐點P2處於與第三曲線區域E3內相向的位置。另外，由於第一曲線區域E1與第三曲線區域E3為於刷本體2的正面側具有曲率中心的形狀，因此第二拐點P2處的阻力方向成為正面側。此處，若於正面側設置有於刷本體2的背面側具有曲率中心的第二曲線區域E2，則於第二拐點P2處正面方向的阻力起作用的情況下，根據其彎曲形狀的性質，具有阻力容易於背面側起作用的性質。此外，第二曲線區域E2的曲率半徑越大，阻力越容易分散傳遞。When the brush body 2 is viewed from the side, the second inflection point P2 is at a position opposite to the inside of the third curved area E3. In addition, since the first curved area E1 and the third curved area E3 have a shape having a center of curvature on the front side of the brush body 2, the resistance direction at the second inflection point P2 becomes the front side. Here, if a second curved area E2 having a center of curvature on the back side of the brush body 2 is provided on the front side, when the resistance in the front direction at the second inflection point P2 acts, according to the nature of the curved shape, It has the property that resistance easily acts on the back side. In addition, the larger the radius of curvature of the second curved area E2, the easier the resistance is dispersed and transmitted.

於本實施方式中，於第二拐點P2處正面方向的阻力起作用的情況下，由第二曲線區域E2帶來的背面方向的阻力更容易起作用，並且朝柄部3的方向傳遞，可進行應力分散。此外，於第二曲線區域E2中，來自第三曲線區域E3的正面方向的阻力亦傳遞，因此起作用的阻力於正面側與背面側相抵消，亦可期待可進一步分散應力。於本實施方式的牙刷1中，藉由刷本體2的側視時的正面側與背面側的特徵性形狀，可避免朝頸部4的應力集中，並利用自頭部5至柄部3為止的刷本體2的整體使應力分散，從而抑制頸部4的撓曲。In this embodiment, when the resistance in the front direction at the second inflection point P2 acts, the resistance in the back direction caused by the second curved area E2 is more likely to act and is transmitted in the direction of the handle 3. Perform stress dispersion. In addition, in the second curve area E2, the resistance from the front direction of the third curve area E3 is also transmitted, so the acting resistance is offset on the front side and the back side, and it can be expected that the stress can be further dispersed. In the toothbrush 1 of the present embodiment, the characteristic shapes of the front side and the back side of the brush body 2 in a side view can avoid stress concentration toward the neck 4, and use from the head 5 to the handle 3 The entire brush body 2 disperses the stress, thereby suppressing the deflection of the neck 4.

於柄部3的外周面的一部分設置有被覆材8。被覆材8由軟質樹脂形成。被覆材8隨著朝向後端側而逆時針設置成螺旋狀。被覆材8亦可為覆蓋柄部3的整個外周面的結構。 作為軟質樹脂，例如可使用聚烯烴系彈性體、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彈性體樹脂、或矽酮樹脂等。A covering material 8 is provided on a part of the outer peripheral surface of the shank 3. The covering material 8 is formed of soft resin. The covering material 8 is provided in a spiral shape counterclockwise as it goes to the rear end side. The covering material 8 may have a structure covering the entire outer peripheral surface of the handle 3. As the soft resin, for example, elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based thermoplastic elastomers, or silicone resins can be used.

藉由於柄部3的外周面的一部分設置被覆材8，於牙刷1中，握持柄部3時的握持性提高，刷臼齒時的操作性提高。Since the covering material 8 is provided on a part of the outer peripheral surface of the handle 3, in the toothbrush 1, the grip when the handle 3 is gripped is improved, and the operability when brushing the molar teeth is improved.

如上所述，於本實施方式的牙刷1中，可提供於刷洗臼齒時***性、操作性及耐久性亦優異的牙刷。As described above, in the toothbrush 1 of the present embodiment, it is possible to provide a toothbrush that is excellent in insertability, operability, and durability when brushing molar teeth.

以上，參照隨附圖示對本發明的較佳的實施方式進行了說明，但本發明當然不限定於所述例子。所述例子中示出的各構成構件的諸形狀或組合等為一例，可於不脫離本發明的主旨的範圍內基於設計要求等進行各種變更。 [實施例]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 examples. The shapes, combinations, etc. of the constituent members shown in the above examples are just an example, and various changes can be made based on design requirements and the like within the scope not departing from the gist of the present invention. [Example]

以下，藉由實施例來進一步明確本發明的效果。再者，本發明並不限定於以下的實施例，可於不變更其主旨的範圍內適當變更來實施。Hereinafter, the effects of the present invention will be further clarified through examples. In addition, the present invention is not limited to the following examples, and can be implemented with appropriate changes within the scope not changing the gist.

（實施例1～實施例4、比較例1～比較例3） 本實施例中，依據下述表1所示的規格製作實施例1～實施例4、比較例1～比較例3的牙刷。 製作圖1及與圖1相同的牙刷。 各例的牙刷的柄體的全長為180 mm，各部位為表1所示的尺寸。 於頭部，將23根牙刷毛（PBT製：7.5密耳（mil））捆紮並製成毛束，以圖2所示的植毛模式植設該毛束，設置植毛部。(Example 1 to Example 4, Comparative Example 1 to Comparative Example 3) In this example, toothbrushes of Example 1 to Example 4, and Comparative Example 1 to Comparative Example 3 were produced in accordance with the specifications shown in Table 1 below. Fig. 1 and the same toothbrush as Fig. 1 were produced. The total length of the handle body of the toothbrush of each example is 180 mm, and each part has the size shown in Table 1. On the head, 23 toothbrush bristles (manufactured by PBT: 7.5 mils (mil)) were bundled to form a tuft, and the tuft was planted in the tufting pattern shown in Fig. 2 to set the tufting part.

[口腔內的臼齒清掃時的操作性] 10名評論員（monitor）對口腔內進行清掃，對各例的牙刷的操作性進行評價。 操作性的評價為1分～7分的7個等級，感覺操作性越良好，分數越高。將10名評論員的平均分分類為下述判定基準，判定口腔內的操作性。 ＜判定基準＞ ◎◎（twin double-circle mark）：平均分為6分以上。 ◎（double-circle mark）：平均分為5分以上且小於6分。 〇（circle mark）：平均分為4分以上且小於5分。 △（triangle mark）：平均分為3分以上且小於4分。 ×（cross mark）：平均分為2分以上且小於3分。[Operability during cleaning of molars in the oral cavity] Ten reviewers (monitors) cleaned the oral cavity and evaluated the operability of the toothbrush in each case. The operability was evaluated on 7 levels from 1 to 7 points, and the better the operability, the higher the score. The average scores of 10 reviewers were classified into the following judgment criteria, and the operability in the oral cavity was judged. <Judgment Criteria> ◎◎(twin double-circle mark): The average score is 6 points or more. ◎(double-circle mark): The average score is more than 5 points and less than 6 points. 〇 (circle mark): The average score is 4 points or more and less than 5 points. △ (triangle mark): The average score is 3 points or more and less than 4 points. × (cross mark): The average score is 2 points or more and less than 3 points.

[口腔內的臼齒清掃時的使用性] 10名評論員對口腔內進行清掃，對將各例的牙刷***口腔內時頸部的背面側與臉頰接觸的感覺的使用感進行評價。 使用性的評價為1分～7分的7個等級，***口腔內時並無頸部的背面側與臉頰接觸的感覺，感覺***性越良好，分數越高。 將10名評論員的平均分分類為下述判定基準，判定口腔內的使用性。 ＜判定基準＞ ◎◎：平均分為6分以上。 ◎：平均分為5分以上且小於6分。 〇：平均分為4分以上且小於5分。 △：平均分為3分以上且小於4分。 ×：平均分為2分以上且小於3分。[Usability for cleaning the molars in the oral cavity] Ten reviewers cleaned the oral cavity and evaluated the feeling of use of the back side of the neck and the cheek when the toothbrush of each example was inserted into the oral cavity. The usability was evaluated on 7 levels from 1 to 7 points. There was no feeling of contact between the back side of the neck and the cheek when inserted into the mouth. The better the insertability, the higher the score. The average scores of 10 reviewers were classified into the following criteria to determine the usability in the oral cavity. <Judgment Criteria> ◎◎: The average score is 6 points or more. ⊚: The average score is 5 points or more and less than 6 points. ○: The average score is 4 points or more and less than 5 points. △: The average score is 3 points or more and less than 4 points. ×: The average score is 2 points or more and less than 3 points.

[表1]   實施例1 實施例2 實施例3 實施例4 實施例5 比較例1 比較例2 比較例3 形狀 頭部的厚度（mm） 3.5 3.5 3.5 3.5 3.5 3.5 3.5 5 頭部與頸部的邊界附近處的朝向背面側的翹曲形狀 有 無 無 無 無 無 無 無 頸部的角度（°） 9 9 15 15 15 26 5 5 頸部的長度（mm） 40 40 40 34 34 40 40 40 頸部的最小厚度 3.6 3.6 3.6 3.6 3.6 3.6 3.6 5.1 頸部的最小厚度為3.0 mm～4.0 mm的長度 8 8 8 8 8 8 8 0 頸部的最小寬度 4.0 4.0 4.0 4.0 4.0 4.0 4.0 5.5 頸部的最小寬度為3.0 mm～4.5 mm的長度 19 19 19 19 19 19 19 0 頸部與柄部的邊界處的剖面積（mm² ） 40 40 40 40 40 40 40 40 毛長（mm） 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm 頭部的傾斜板部（角度） 無 無 無 無 有（10°） 無 無 無 柄體的材質 PP PP PP PP PP PP PP PP 比柄部3的長軸方向的中央更靠前端側的柄部3A的位置P11與虛擬線50的距離 21 21 24 24 24 21 15 15 柄部3A的最大厚度（mm） 11 11 11 11 11 11 11 11 柄部3A的最大厚度（mm） 14 14 14 14 14 14 14 14 曲率半徑R1 70 150 110 90 90 200 300 400 曲率半徑R2 60 100 70 70 70 100 200 200 曲率半徑R3 300 300 250 200 200 400 500 600 曲率半徑R4 200 200 160 160 160 200 300 300 P1與P2的最短距離（側視時） 30 37 37 31 31 47 47 47 評價項目 P11與P2的最短距離（側視時） 54 54 54 60 60 44 44 44 邊界O與P11的最短距離（側視時） 94 94 94 88 88 104 104 104 臼齒清掃時的操作性 〇 ◎ ◎ ◎◎ ◎◎ △ △ × 臼齒清掃時的使用感 （於***口腔內時，頸部的背面側與臉頰接觸的感覺） 〇 ◎ ◎◎ ◎◎ ◎◎ 〇 △ × [Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 Comparative example 3 shape The thickness of the head (mm) 3.5 3.5 3.5 3.5 3.5 3.5 3.5 5 The warped shape toward the back side near the boundary between the head and the neck have none none none none none none none The angle of the neck (°) 9 9 15 15 15 26 5 5 Length of neck (mm) 40 40 40 34 34 40 40 40 Minimum thickness of neck 3.6 3.6 3.6 3.6 3.6 3.6 3.6 5.1 The minimum thickness of the neck is a length of 3.0 mm～4.0 mm 8 8 8 8 8 8 8 0 Minimum width of neck 4.0 4.0 4.0 4.0 4.0 4.0 4.0 5.5 The minimum width of the neck is a length of 3.0 mm～4.5 mm 19 19 19 19 19 19 19 0 Sectional area at the boundary between neck and handle (mm ² ) 40 40 40 40 40 40 40 40 Hair length (mm) 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm 10 mm Inclined plate part of the head (angle) none none none none Yes (10°) none none none Handle body material PP PP PP PP PP PP PP PP The distance between the position P11 of the shank 3A on the tip side than the center of the shank 3 in the long axis direction and the virtual line 50 twenty one twenty one twenty four twenty four twenty four twenty one 15 15 Maximum thickness of handle 3A (mm) 11 11 11 11 11 11 11 11 Maximum thickness of handle 3A (mm) 14 14 14 14 14 14 14 14 Radius of curvature R1 70 150 110 90 90 200 300 400 Radius of curvature R2 60 100 70 70 70 100 200 200 Radius of curvature R3 300 300 250 200 200 400 500 600 Radius of curvature R4 200 200 160 160 160 200 300 300 The shortest distance between P1 and P2 (when viewed from the side) 30 37 37 31 31 47 47 47 Evaluation item The shortest distance between P11 and P2 (when viewed from the side) 54 54 54 60 60 44 44 44 The shortest distance between boundary O and P11 (when viewed from the side) 94 94 94 88 88 104 104 104 Maneuverability during molar cleaning 〇 ◎ ◎ ◎◎ ◎◎ △ △ X The feeling of use during molar cleaning (the feeling that the back side of the neck is in contact with the cheek when inserted into the mouth) 〇 ◎ ◎◎ ◎◎ ◎◎ 〇 △ X

如[表1]所示，於頭部的最大厚度為2.0 mm以上且小於4 mm、頸部的傾斜角度為8°以上且25°以下的實施例1～實施例4的牙刷中，於臼齒清掃時的操作性及臼齒清掃時的使用感兩方面均獲得了良好的結果。As shown in [Table 1], in the toothbrushes of Examples 1 to 4 in which the maximum thickness of the head is 2.0 mm or more and less than 4 mm, and the inclination angle of the neck is 8° or more and 25° or less, the molar tooth Good results were obtained in both the operability during cleaning and the feeling of use during molar cleaning.

以上，參照隨附圖示對本發明的較佳的實施方式進行了說明，但本發明當然不限定於所述例子。所述例子中示出的各構成構件的諸形狀或組合等為一例，可於不脫離本發明的主旨的範圍內基於設計要求等進行各種變更。 [產業上的可利用性]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 examples. The shapes, combinations, etc. of the constituent members shown in the above examples are just an example, and various changes can be made based on design requirements and the like within the scope not departing from the gist of the present invention. [Industrial availability]

本發明可適用於牙刷。The present invention can be applied to toothbrushes.

1:牙刷 2:刷本體 3、3A、3B、3Amax、3Amax':柄部 4:頸部 5:頭部 5a～5d:植毛面 6:植毛孔 8:被覆材 40:刷 41:毛束 50:虛擬線 51:平板部 52:傾斜板部 E1:第一曲線區域 E2:第二曲線區域 E3:第三曲線區域 E4:第四曲線區域 O:邊界 P1:第一拐點 P2:第二拐點 P3:第三拐點 P4:第四拐點 P11、p11':位置 Q1、Q2:後端側緣部 R1～R4:曲率半徑 S1:第一直線區域 S2:第二直線區域 θ:傾斜角度1: Toothbrush 2: Brush the body 3, 3A, 3B, 3Amax, 3Amax': handle 4: neck 5: head 5a～5d: Planting surface 6: Planting pores 8: Coating material 40: Brush 41: Hair Bundle 50: virtual line 51: Flat part 52: Inclined board E1: The first curve area E2: second curve area E3: The third curve area E4: The fourth curve area O: boundary P1: the first inflection point P2: second inflection point P3: third inflection point P4: Fourth inflection point P11, p11': position Q1, Q2: the edge of the rear end R1～R4: radius of curvature S1: The first straight line area S2: The second straight area θ: Tilt angle

圖1是表示本發明的實施方式的圖，是表示牙刷1的結構的側面圖。 圖2是自植毛面5a側觀察牙刷1的正面圖。 圖3是頭部5的放大正面圖。 圖4是頭部5的放大側面圖。FIG. 1 is a diagram showing an embodiment of the present invention, and is a side view showing the structure of a toothbrush 1. As shown in FIG. Fig. 2 is a front view of the toothbrush 1 as viewed from the side of the grafted surface 5a. FIG. 3 is an enlarged front view of the head 5. FIG. 4 is an enlarged side view of the head 5.

1:牙刷 1: Toothbrush

2:刷本體 2: Brush the body

3、3A、3B、3Amax、3Amax':柄部 3, 3A, 3B, 3Amax, 3Amax': handle

4:頸部 4: neck

5:頭部 5: head

5a:植毛面 5a: Tufted surface

8:被覆材 8: Coating material

40:刷 40: Brush

41:毛束 41: Hair Bundle

50:虛擬線 50: virtual line

51:平板部 51: Flat part

52:傾斜板部 52: Inclined board

E1:第一曲線區域 E1: The first curve area

E2:第二曲線區域 E2: second curve area

E3:第三曲線區域 E3: The third curve area

E4:第四曲線區域 E4: The fourth curve area

O:邊界 O: boundary

P1:第一拐點 P1: the first inflection point

P2:第二拐點 P2: second inflection point

P3:第三拐點 P3: third inflection point

P4:第四拐點 P4: Fourth inflection point

P11、p11':位置 P11, p11': position

Q1、Q2:後端側緣部 Q1, Q2: the edge of the rear end

S1:第一直線區域 S1: The first straight line area

S2:第二直線區域 S2: The second straight area

θ:傾斜角度 θ: Tilt angle

Claims (9)

一種牙刷，包括刷本體，所述刷本體沿長軸方向設置有柄部、自所述柄部的前端延長的頸部、以及位於所述頸部的前端的頭部， 於形成於所述頭部的植毛面的多個植毛孔植設有毛束，且所述牙刷的特徵在於， 所述刷本體具有所述頸部的厚度自所述頭部朝向所述柄部連續增加的形狀， 所述頭部的最大厚度為2.0 mm以上且小於4 mm， 於側面觀察所述刷本體時的所述植毛面側，具有：第一直線區域，自所述植毛面連續地向後端側呈直線狀延伸；第一曲線區域，於所述植毛面側具有曲率中心，自位於所述第一直線區域的後端的第一拐點向所述後端側呈圓弧狀延伸；以及第二曲線區域，於與所述植毛面側為相反側的背面側具有曲率中心，自位於所述第一曲線區域的後端的第二拐點向所述後端側呈圓弧狀延伸， 由貫穿所述側視時的位於最後端側的所述植毛孔的後端側緣部與所述第二拐點的直線和虛擬線交差的角度所表示的所述頸部的傾斜角度為8°以上且25°以下，所述虛擬線貫穿所述多個植毛孔中於所述側視時位於最後端側的所述植毛孔的後端側緣部與位於第二後端側的所述植毛孔的後端側緣部。A toothbrush includes a brush body, the brush body is provided with a handle, a neck extending from the front end of the handle, and a head located at the front end of the neck along the longitudinal direction of the brush body, A plurality of hair transplanting holes formed on the hair transplanting surface of the head are implanted with hair bundles, and the toothbrush is characterized in that: The brush body has a shape in which the thickness of the neck continuously increases from the head toward the handle, The maximum thickness of the head is more than 2.0 mm and less than 4 mm, When the brush body is viewed from the side, the tufting surface side has: a first straight line area extending continuously from the tufting surface to the rear end side in a straight line; a first curvilinear area having a center of curvature on the tufting surface side , Extending in an arc shape from a first inflection point located at the rear end of the first straight line area to the rear end side; and a second curved area having a center of curvature on the back side opposite to the tufting surface side, from A second inflection point located at the rear end of the first curved area extends in an arc shape toward the rear end, The inclination angle of the neck represented by the angle between the straight line and the imaginary line of the second inflection point and the rear end side edge of the hair transplantation hole located on the rearmost end side when passing through the side view is 8° Above and below 25°, the virtual line penetrates the rear end side edge of the transplantation hole located on the rearmost end side in the side view among the plurality of hair transplantation holes and the transplantation hole located on the second rear end side. The rear edge of the pore. 如請求項1所述的牙刷，其中於所述側視時的所述背面側，具有： 第二直線區域，自所述頭部的背面連續地向後端側呈直線狀延伸；以及 第三曲線區域，於所述植毛面側具有曲率中心，自位於所述第二直線區域的後端的第三拐點向所述後端側呈圓弧狀延伸。The toothbrush according to claim 1, wherein the back side in the side view has: The second straight line area continuously extends linearly from the back of the head to the rear end side; and The third curved area has a center of curvature on the side of the tufted surface, and extends in an arc shape from a third inflection point located at the rear end of the second straight line area to the rear end side. 如請求項2所述的牙刷，其中於所述側視時的所述背面側具有第四曲線區域， 所述第四曲線區域於所述背面側具有曲率中心，自位於所述第三曲線區域的後端的第四拐點向所述後端側呈圓弧狀延伸。The toothbrush according to claim 2, wherein the back side in the side view has a fourth curved area, The fourth curved area has a center of curvature on the back side, and extends in an arc shape from a fourth inflection point located at the rear end of the third curved area to the rear end side. 如請求項1至請求項3中任一項所述的牙刷，其中 所述頸部的最小厚度為3.0 mm～4.0 mm的於所述長軸方向上的長度為5 mm以上。The toothbrush according to any one of claims 1 to 3, wherein The minimum thickness of the neck portion is 3.0 mm to 4.0 mm, and the length in the long axis direction is 5 mm or more. 如請求項1至請求項4中任一項所述的牙刷，其中 所述頸部與所述柄部的邊界處的剖面形狀為橢圓形狀。The toothbrush according to any one of claims 1 to 4, wherein The cross-sectional shape of the boundary between the neck and the handle is an ellipse. 如請求項1至請求項5中任一項所述的牙刷，其中 所述頸部的於所述長軸方向上的長度為25 mm以上且45 mm以下。The toothbrush according to any one of claims 1 to 5, wherein The length of the neck in the long axis direction is 25 mm or more and 45 mm or less. 如請求項1至請求項6中任一項所述的牙刷，不具有於所述頭部與所述頸部的邊界附近暫時向背面側翹曲的形狀。The toothbrush according to any one of claims 1 to 6 does not have a shape that is temporarily warped to the back side in the vicinity of the boundary between the head and the neck. 如請求項1至請求項7中任一項所述的牙刷，其中 於所述側視時的所述植毛面側的所述柄部與所述虛擬線的距離最長的所述長軸方向的位置位於比所述柄部的所述長軸方向的中央更靠前端側。The toothbrush according to any one of claims 1 to 7, wherein In the side view, the position in the long axis direction where the distance between the shank portion on the flocking surface side and the virtual line is the longest is located closer to the tip than the center of the shank portion in the long axis direction side. 如請求項1至請求項8中任一項所述的牙刷，其中 所述頭部的前端側於所述側視時相對於所述虛擬線向所述植毛面側以5°以上且15°以下的角度傾斜。The toothbrush according to any one of claims 1 to 8, wherein The tip side of the head is inclined at an angle of not less than 5° and not more than 15° with respect to the virtual line to the side of the tufting surface in the side view.

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