CN113208262B

Movatterモバイル変換

Info

Publication number: CN113208262B
Application number: CN202110411780.9A
Authority: CN
Inventors: 金丸直史; 龟井诚一
Original assignee: Lion Corp
Current assignee: Lion Corp
Priority date: 2016-10-28
Filing date: 2017-09-13
Publication date: 2023-01-13
Anticipated expiration: 2037-09-13
Also published as: JP2018118169A; WO2018079115A1; KR20230113407A; SG10202107804WA; JP2023026520A; KR102743233B1; CN113208262A; CN109890249B; JP6385027B1; JPWO2018079115A1; JP2023026518A; JP2024160027A; JP2023026519A; MY208309A; SG10202107814QA; MY200895A; JP2023026521A; CN109890249A; KR102556407B1; KR20190069392A

Abstract

Translated fromChinese

提供能够得到良好操作性的头部薄的牙刷。头部厚度为2.0～4.0mm，颈部宽度的最小值为3.5～4.5mm。设颈部宽度为W mm，厚度为D mm，则颈部宽度从最小值的位置向后端侧方向逐渐变大时，以最小值的位置为起点，颈部宽度从最小值的位置向后端侧方向恒定时，以最前端侧的最小值的位置为起点，与植毛面平行地，在后端侧相距10mm的位置处，D/W值为0.7～2.5，且在宽度为最小值的起点的位置处的D/W值与在该起点的位置的后端侧距离20mm的位置处的D/W值之差在0.05以上，且在该起点的位置的后端侧距离20mm的位置处的D/W超过1.0，在宽度为最小值的起点的位置的后端侧距离10mm的位置处的挠曲系数M(mm⁴)＝W×D³为165～625mm⁴。

To provide a toothbrush with a thin head capable of obtaining good operability. The head thickness is 2.0-4.0mm, and the minimum neck width is 3.5-4.5mm. Assuming that the neck width is W mm and the thickness is D mm, when the neck width gradually increases from the position of the minimum value to the rear end side, the position of the minimum value is used as the starting point, and the neck width is backward from the position of the minimum value When the direction of the end side is constant, the D/W value is 0.7 to 2.5 at a position 10mm away from the rear end side parallel to the flocking surface, starting from the position of the minimum value on the front end side, and the width is the minimum value. The difference between the D/W value at the starting point and the D/W value at a position 20 mm behind the starting point is 0.05 or more, and at a position 20 mm behind the starting point D/W exceeds 1.0, and the deflection coefficient M (mm⁴ )=W×D³ at a position 10 mm behind the starting point where the width is the minimum value is 165 to 625 mm⁴ .

Description

Translated fromChinese

牙刷toothbrush

技术领域technical field

本申请是2017年9月13日提交、发明名称为“牙刷”、申请号为201780066424.X的中国专利申请的分案申请。This application is a divisional application of a Chinese patent application filed on September 13, 2017 with the title of the invention "Toothbrush" and application number 201780066424.X.

本发明涉及牙刷。The present invention relates to toothbrushes.

本申请要求基于2016年10月28日在日本提出申请的日本专利申请2016-211879号的优先权，并在这里引用其内容。This application claims priority based on Japanese Patent Application No. 2016-211879 for which it applied in Japan on October 28, 2016, and uses the content here.

背景技术Background technique

专利文献1～3中提出了一种基于在口腔内的操作性等角度考虑而使头部厚度变薄的牙刷的方案。在使头部的厚度变薄时，会出现强度降低等问题。因此，使用聚缩醛树脂(POM)等强度高的树脂。特别是，在通过将由金属制成的扁平线(flat plate)打入由树脂制成的头部来固定刷毛的扁平线式植毛的情况下，有时会出现植毛强度、头部的耐折强度不充分的情况。Patent Documents 1 to 3 propose a toothbrush in which the thickness of the head is reduced from the viewpoint of operability in the oral cavity and the like. When the thickness of the head is made thin, there are problems such as a decrease in strength. Therefore, a high-strength resin such as polyacetal resin (POM) is used. In particular, in the case of a flat wire type hair transplant in which bristles are fixed by driving a flat plate made of metal into a head made of resin, the strength of the hair transplant and the bending strength of the head may sometimes be insufficient. full situation.

现有技术文献prior art literature

专利文献patent documents

专利文献1：JP特开平7-143914号公报Patent Document 1: JP Unexamined Patent Publication No. 7-143914

专利文献2：JP特开2011-4852号公报Patent Document 2: JP Unexamined Publication No. 2011-4852

专利文献3：JP特开2011-200296号公报Patent Document 3: JP Unexamined Publication No. 2011-200296

发明内容Contents of the invention

发明所要解决的问题The problem to be solved by the invention

本发明人研究后发现：上述牙刷中，连接头部和把手部的颈部粗时，由头部变薄带来的口腔内操作性的提高效果受损。特别是，若颈部变宽时，不仅进一步损害操作性，而且外观上头部的薄度也不显著，商品的印象也受损。然而，使颈部变细时，有时会出现过度挠曲反而在操作性上产生问题的情况。此外，强度上也需要进一步改善。尤其是，在聚丙烯(PP)等牙刷中通常使用的通用树脂的情况下，问题更为显著。The inventors of the present invention have found that, in the above toothbrush, when the neck connecting the head and the handle is thick, the effect of improving the operability in the oral cavity due to the thinning of the head is impaired. In particular, if the neck becomes wider, not only the operability is further impaired, but also the thinness of the head is not conspicuous in appearance, and the image of the product is also impaired. However, when the neck is made thinner, there may be cases where excessive bending causes a problem in operability. In addition, the strength also needs to be further improved. In particular, the problem is more pronounced in the case of general-purpose resins commonly used in toothbrushes such as polypropylene (PP).

本发明是鉴于上述情况而完成的，其目的在于提供一种能够得到良好操作性的头部薄的牙刷。This invention is made|formed in view of the said situation, and it aims at providing the toothbrush with a thin head which can obtain favorable handleability.

解决问题的手段means of solving problems

本发明的第1方式提供一种牙刷，其特征在于，具备配置在前端侧且植毛面上植入有毛束的头部、由该头部的后端侧延伸设置的颈部以及由该颈部的后端侧延伸设置的把手部，所述头部的厚度为2.0～4.0mm，所述颈部形成为：与所述植毛面平行且与所述把手部的长度方向垂直相交的方向上的宽度的最小值为3.5mm以上、4.5mm以下，从所述最小值的位置向后端侧方向，所述宽度恒定或逐渐变大，设所述颈部的所述宽度为Wmm，与所述植毛面垂直相交的方向上的厚度为D mm时，所述颈部的宽度从所述最小值的位置向后端侧方向逐渐变大时，以该最小值的位置为起点，所述颈部的宽度从所述最小值的位置向后端侧方向恒定时，以最前端侧的所述最小值的位置为起点，与所述植毛面平行地，在所述后端侧相距10mm的位置处由所述D/W求得的值为0.7以上、2.5以下，且在所述宽度为最小值的所述起点的位置处由所述D/W求得的值，与在该起点的位置的后端侧距离20mm的位置处由所述D/W求得的值之差在0.05以上，且在该起点的位置的后端侧距离20mm的位置处的D/W超过1.0，在所述宽度为最小值的所述起点的位置的所述后端侧距离10mm的位置处的挠曲系数M(mm⁴)＝W×D³为165mm⁴以上、625mm⁴以下。A first aspect of the present invention provides a toothbrush characterized in that it includes a head arranged on the front end side and a hair bundle implanted on the bristle-implanted surface, a neck extending from the rear end side of the head, and a toothbrush extending from the neck. A handle part extending from the rear end side of the head part, the thickness of the head part is 2.0-4.0 mm, and the neck part is formed in a direction parallel to the flocking surface and perpendicular to the length direction of the handle part The minimum value of the width of the neck is more than 3.5mm and less than 4.5mm. From the position of the minimum value to the rear end side, the width is constant or gradually increases. The width of the neck is Wmm, and the When the thickness in the direction where the flocking surfaces intersect vertically is D mm, when the width of the neck gradually increases from the position of the minimum value to the rear end side, the position of the minimum value is used as the starting point, and the neck When the width of the portion is constant from the position of the minimum value to the rear end side, the position of the minimum value on the front end side is used as a starting point, parallel to the flocking surface, and at a position 10 mm away from the rear end side The value obtained by the D/W at the position where the value obtained by the D/W is between 0.7 and 2.5, and the value obtained by the D/W at the position of the starting point where the width is the minimum value, and the position of the starting point The difference between the values obtained from the D/W at a position 20 mm from the rear end side of the starting point is more than 0.05, and the D/W at a position 20 mm from the rear end side of the starting point exceeds 1.0, in the The deflection coefficient M (mm⁴ )=W×D³ at a position 10 mm away from the rear end side of the starting point where the width is the smallest value is 165 mm⁴ or more and 625 mm⁴ or less.

此外，上述本发明的一实施方式的牙刷中，其特征在于，所述颈部由树脂材料形成，所述树脂材料的弯曲弹性模量为1000MPa以上、2200MPa以下。Furthermore, in the toothbrush according to one embodiment of the present invention described above, the neck portion is formed of a resin material, and the flexural modulus of the resin material is 1000 MPa or more and 2200 MPa or less.

此外，上述本发明的一实施方式的牙刷中，其特征在于，所述颈部由聚丙烯树脂形成。Furthermore, in the toothbrush according to one embodiment of the present invention, the neck portion is formed of polypropylene resin.

另外，上述本发明的一实施方式的牙刷中，其特征在于，以在所述宽度为最小值的所述起点的位置的后端侧距离10mm的位置为基准，在该基准的位置的后端侧距离10mm的位置处的所述挠曲系数的变化率为1.3以上、1.8以下。In addition, in the toothbrush according to one embodiment of the present invention described above, it is characterized in that a position at a distance of 10 mm from the rear end side of the starting point at which the width is the minimum value is used as a reference, and at the rear end of the reference position The rate of change of the deflection coefficient at a position with a side distance of 10 mm is not less than 1.3 and not more than 1.8.

另外，上述本发明的一实施方式的牙刷中，其特征在于，在所述宽度为最小值的所述起点的位置处由所述D/W求得的值与在该位置的后端侧距离20mm的位置处由所述D/W求得的值之差在0.07以下。In addition, in the toothbrush according to one embodiment of the present invention described above, the value obtained from the D/W at the position of the starting point where the width is the minimum value is equal to the distance from the rear end side of the position. The difference between the values obtained from the D/W at the position of 20 mm is 0.07 or less.

发明效果Invention effect

本发明可以提供即使在使用通用树脂的情况下也能够得到良好的口腔内操作性的牙刷。The present invention can provide a toothbrush capable of obtaining good operability in the oral cavity even when a general-purpose resin is used.

附图说明Description of drawings

[图1]是示出本发明的实施方式的图，是牙刷11的平面视图。[ Fig. 1 ] is a diagram illustrating an embodiment of the present invention, and is a plan view of atoothbrush 11 .

[图2]是相同牙刷11的侧面视图。[ FIG. 2 ] is a side view of thesame toothbrush 11 .

[图3]是将牙刷11的前端侧进行了放大的平面视图。[FIG. 3] It is a plan view which enlarged the front-end|tip side of thetoothbrush 11. [FIG.

[图4]是将牙刷11的前端侧进行了放大的侧面视图。[FIG. 4] It is an enlarged side view of the front-end|tip side of thetoothbrush 11. [FIG.

[符号说明][Symbol Description]

11…牙刷；12…把手体；110…头部；111…植毛面；120…颈部；130…把手部。11...toothbrush; 12...handle body; 110...head; 111...flocking surface; 120...neck; 130...handle.

具体实施方式detailed description

以下，结合图1～图4对本发明的牙刷的把手体以及牙刷的实施方式进行说明。Hereinafter, embodiments of the handle body of the toothbrush and the toothbrush according to the present invention will be described with reference to FIGS. 1 to 4 .

此外，以下实施的实施方式显示本发明的一实施方式，而并未限定本发明，在本发明的技术思想范围内可任意变更。此外，以下附图中，为了使各结构易于理解，实际结构与各结构中的比例尺或数量等会有所不同。In addition, the following embodiment shows one embodiment of this invention, It does not limit this invention, It can change arbitrarily within the scope of the technical idea of this invention. In addition, in the following drawings, in order to make each structure easy to understand, the actual structure differs from the scale or number in each structure.

图1是牙刷11的平面视图。图2是牙刷11的侧面视图。图3是将牙刷11的前端侧进行了放大的平面视图。图4是将牙刷11的前端侧进行了放大的侧面视图。FIG. 1 is a plan view of atoothbrush 11 . FIG. 2 is a side view oftoothbrush 11 . FIG. 3 is an enlarged plan view of the front end side of thetoothbrush 11 . FIG. 4 is an enlarged side view of the front end side of thetoothbrush 11 .

本实施方式的牙刷11具备：配置在前端且植入有刷毛的毛束114的头部110，由头部110的后端侧延伸设置的颈部120，和由颈部120的后端侧延伸设置的把手部130(以下，将头部110、颈部120和把手部130合称为把手体12)。Thetoothbrush 11 of the present embodiment is provided with: thehead 110 that is arranged at the front end and has thehair bundle 114 implanted with bristles, theneck 120 extending from the rear end side of thehead 110 , and theA handle portion 130 is provided (hereinafter, thehead portion 110 , theneck portion 120 and thehandle portion 130 are collectively referred to as the handle body 12 ).

关于把手体，作为整体一体成形为长尺状，例如可以以树脂作为材料、通过注射成型获得。The handle body is integrally molded into a long shape as a whole, and can be obtained by injection molding, for example, using resin as a material.

作为把手体的材质，可列举弯曲弹性模量(JIS7171)在1000MPa以上2200MPa以下的树脂，可举例如，聚丙烯树脂(PP)、聚缩醛树脂(POM)、聚苯乙烯树脂(PS)、聚对苯二甲酸乙二酯树脂(PET)、聚对苯二甲酸丁二醇酯树脂(PBT)、丙烯腈丁二烯苯乙烯树脂(ABS)、聚芳酯树脂、聚碳酸酯树脂、丙烯腈苯乙烯树脂(AS)等。其中，从本发明效果更显著以及成本方面考虑，优选作为通用树脂的聚丙烯树脂。As the material of the handle body, a resin having a flexural modulus (JIS7171) of 1000 MPa to 2200 MPa can be mentioned, for example, polypropylene resin (PP), polyacetal resin (POM), polystyrene resin (PS), Polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile butadiene styrene resin (ABS), polyarylate resin, polycarbonate resin, acrylic Nitrile styrene resin (AS), etc. Among them, polypropylene resin, which is a general-purpose resin, is preferable from the standpoint of more remarkable effect of the present invention and cost.

上述树脂可单独使用1种，或者可并用2种以上。These resins may be used alone or in combination of two or more.

此外，为了提高握持性，把手体可被例如弹性体等柔软的树脂部分或全部覆盖。使用弹性体等柔软的树脂的情况下，从提高粘接性的角度考虑，优选例如聚烯烃，更优选PP。In addition, in order to improve the grip, the handle body may be partially or completely covered with a soft resin such as an elastomer. In the case of using a soft resin such as an elastomer, for example, polyolefin is preferable, and PP is more preferable from the viewpoint of improving adhesiveness.

头部110在厚度方向的一侧(以下，称为上表面侧)具有植毛面111。在植毛面111上，形成有多个植毛孔112，在植毛孔112中植入有刷毛的毛束114(参见图2)。此外，图1、图3以及图4中，毛束114在图示中省略。Thehead part 110 has the flockingsurface 111 on one side (henceforth an upper surface side) of a thickness direction. On the hair-plantingsurface 111, a plurality of hair-plantingholes 112 are formed, andhair bundles 114 of bristles are implanted in the hair-planting holes 112 (see FIG. 2 ). In addition, in FIG. 1, FIG. 3, and FIG. 4, thehair bundle 114 is abbreviate|omitted in illustration.

本实施方式中的头部110的后端侧端部定义为：设从配置在最前端侧的植毛孔112的外边缘到头部110的前端的距离为L11时，从配置在最后端侧的植毛孔112的外边缘向着后端侧的方向距离L11的位置。即，如图3所示地，头部110配置在与位于长度方向两端的植毛孔112的外边缘分别相距距离L11的范围110A。范围110A的后端侧的位置是头部110与颈部120之间的边界。The rear end side end of thehead 110 in the present embodiment is defined as: when the distance from the outer edge of thetuft hole 112 arranged on the frontmost side to the front end of thehead 110 is L11, the The outer edge of the tuft-planting hole 112 faces the rear end side at a distance L11. That is, as shown in FIG. 3, thehead part 110 is arrange|positioned in 110 A of distances L11 from the outer edge of the tuft-planting hole 112 located in both ends of a longitudinal direction, respectively. The position on the rear end side of therange 110A is the boundary between thehead 110 and theneck 120 .

把手部130的前端侧端部为手指接触部，手指接触部的前端侧端部为颈部120与把手部130之间的边界。手指接触部被下述棱线区划：例如，形成于颈部120的后端侧中的植毛面111侧的面和把手部130的前端侧中的植毛面111侧的面的交叉部的棱线，或形成于颈部120的后端侧中的植毛面111的相反侧的面和把手部130的前端侧中的植毛面111的相反侧的面的交叉部的棱线。此时，颈部120与把手部130之间的边界通过上述棱线来定义。The front end portion of thehandle portion 130 is a finger contact portion, and the front end portion of the finger contact portion is a boundary between theneck portion 120 and thehandle portion 130 . The finger contact portion is divided by the following ridgelines: for example, the ridgeline formed at the intersection of the surface on the flockingsurface 111 side in the rear end side of theneck 120 and the surface on the flockingsurface 111 side in the front end side of thehandle portion 130 , or the ridge line formed at the intersection of the surface opposite to the flockingsurface 111 on the rear end side of theneck 120 and the surface on the opposite side to the flockingsurface 111 on the front end side of thehandle portion 130 . At this time, the boundary between theneck portion 120 and thehandle portion 130 is defined by the aforementioned ridgeline.

此外，颈部120的后端侧中的植毛面111侧的面和把手部130的前端侧中的植毛面111侧的面在同一平面上而不形成棱线的情况下，通过形成于颈部120的后端侧中的宽度方向的侧面和把手部130的前端侧中的宽度方向的侧面的交叉部的棱线，来区划手指接触部。此时，颈部120与把手部130之间的边界也是通过上述棱线来定义。In addition, when the surface on the side of the flockingsurface 111 on the rear end side of theneck 120 and the surface on the side of the flockingsurface 111 on the front end side of thehandle 130 are on the same plane without forming a ridge line, the The finger contact portion is defined by the ridge line at the intersection of the side surface in the width direction on the rear end side of 120 and the side surface in the width direction on the front end side of thehandle portion 130 . At this time, the boundary between theneck portion 120 and thehandle portion 130 is also defined by the above-mentioned ridgeline.

例如，在侧面视角中把手部130在植毛面111侧形成为呈凸起的近似圆弧形状、颈部120在植毛面111侧形成为呈凹陷的近似圆弧形状的S字形状的实施例的把手体12的情况下，按照如下定义颈部120与把手部130之间的边界。For example, in a side view, thehandle portion 130 is formed in a convex approximate arc shape on the flockingsurface 111 side, and theneck 120 is formed in an S-shaped recessed approximate arc shape on the flockingsurface 111 side. In the case of thehandle body 12, the boundary between theneck portion 120 and thehandle portion 130 is defined as follows.

在把手部130的前端侧的植毛面111侧，形成有中心位置配置在与植毛面111相反的一侧(图2以及图4中，比把手部130更下面的一侧)、在侧面视角中植毛面111侧呈凸起的圆弧轮廓的曲面133。同样地，在把手部130的前端侧的与植毛面111相反的一侧，形成有中心位置配置在与植毛面111相反的一侧、在侧面视角中植毛面111侧呈凸起的圆弧轮廓的曲面134。On the side of the flockingsurface 111 on the front end side of thehandle portion 130, a center position is formed on the opposite side to the flocking surface 111 (in FIGS. 2 and 4 , the lower side than the handle portion 130). The side of the flockingsurface 111 is acurved surface 133 with a raised arc profile. Similarly, on the side opposite to the flockingsurface 111 on the front end side of thehandle portion 130, there is formed a circular arc profile whose center position is disposed on the opposite side to the flockingsurface 111, and where the flockingsurface 111 side is convex in a side view. Thecurved surface 134.

此外，在颈部120的后端侧的植毛面111侧，形成有中心位置配置在植毛面111(图2以及图4中，比把手部130更上面的一侧)、在侧面视角中植毛面111侧呈凹陷的圆弧轮廓的曲面123。同样地，在颈部120的后端侧的与植毛面111相反的一侧，形成有中心位置配置在植毛面111、在侧面视角中植毛面111侧呈凹陷的圆弧轮廓的曲面124。In addition, on the side of the flockingsurface 111 on the rear end side of theneck 120, a central position is arranged on the flocking surface 111 (in FIGS. Theside 111 is acurved surface 123 with a concave arc profile. Similarly, on the side opposite to the flockingsurface 111 on the rear end side of theneck 120, acurved surface 124 is formed with a center position disposed on the flockingsurface 111, and the flockingsurface 111 side is concave in a side view.

随着曲面123以及曲面133分别沿着把手部130的长度方向延伸，在侧面视角中的切线与植毛面111之间的交叉角连续性变化，但在曲面123和曲面133的交叉部上，以切线彼此之间的交叉角为非0或180度的角度θ1交叉。因此，在曲面123和曲面133的交叉部，形成有棱线131。As thecurved surface 123 and thecurved surface 133 extend along the length direction of thehandle portion 130 respectively, the intersection angle between the tangent in the side view and the flockingsurface 111 changes continuously, but on the intersection of thecurved surface 123 and thecurved surface 133, with The tangent lines intersect each other at an angle θ1 other than 0 or 180 degrees. Therefore, aridgeline 131 is formed at the intersection of thecurved surface 123 and thecurved surface 133 .

关于曲面124以及曲面134，也分别随着在把手部130的长度方向上延伸，在侧面视角中的切线与植毛面111之间的交叉角连续性变化，但在曲面124和曲面134的交叉部，以切线彼此之间的交叉角为非0或180度的角度θ2交叉。因此，在曲面124和曲面134的交叉部，形成有棱线132。因此，对于颈部120以及把手部130，将夹着棱线131、132的长度方向的一侧的侧面视角中植毛面111侧呈凸起的圆弧轮廓的曲面133、134与夹着棱线131、132的长度方向的另一侧的侧面视角中植毛面111侧呈凹陷的圆弧轮廓的曲面123、124相连，由此在侧面视角中形成近似S字状。Regarding thecurved surface 124 and thecurved surface 134, also along with extending on the length direction of thehandle portion 130 respectively, the intersection angle continuity between the tangent line in the side view and the flockingsurface 111 changes, but at the intersection of thecurved surface 124 and thecurved surface 134 , the tangents intersect each other at an angle θ2 that is not 0 or 180 degrees. Therefore, aridgeline 132 is formed at the intersection of thecurved surface 124 and thecurved surface 134 . Therefore, for theneck portion 120 and thehandle portion 130, thecurved surfaces 133, 134 that sandwich theridgelines 131, 132 in the side view of the side of the longitudinal direction of the flockingsurface 111 are convex arc profiles and the sides of theridgelines 131, 132. 131 , 132 in the side view of the other side in the longitudinal direction are connected to thecurved surfaces 123 , 124 with a concave arc profile on the side of the flockingsurface 111 , thereby forming an approximate S-shape in the side view.

颈部120的后端侧的边界通过棱线131、132来定义。因此，比棱线131、132更后端侧是配置有把手部130的范围130A，在配置有头部110的范围110A和配置有把手部130的范围130A之间的范围120A配置有颈部120。The rear boundary ofneck 120 is defined byridges 131 , 132 . Therefore, therange 130A where thehandle portion 130 is disposed is located on the rear end side of theridges 131 and 132 , and theneck portion 120 is disposed in arange 120A between therange 110A where thehead portion 110 is disposed and therange 130A where thehandle portion 130 is disposed. .

把手部130的前端侧中的植毛面111侧的端部(比棱线131更后端的一侧)为手指接触部。使用者用拇指接触手指接触部，握持把手部130，由此，可以稳定操作牙刷11。此外，把手部130的长度方向上的棱线132的位置在比棱线131更后端的一侧。因此，与棱线132的位置在比棱线131更前端的一侧的情况相比，手指接触部变厚，可以使牙刷11的操作更加稳定。The edge part on the flockingsurface 111 side among the front-end|tip side of the handle part 130 (the side behind the edge line 131) is a finger contact part. The user can stably operate thetoothbrush 11 by touching the finger contact portion with the thumb and holding thehandle portion 130 . In addition, the position of theridge line 132 in the longitudinal direction of thehandle portion 130 is on the rear side of theridge line 131 . Therefore, compared with the case where the position of theridge line 132 is on the front side of theridge line 131, the finger contact part becomes thicker, and the operation of thetoothbrush 11 can be made more stable.

把手体12的长度没有特别限定，例如可为100～200mm。The length of thehandle body 12 is not particularly limited, and may be, for example, 100 to 200 mm.

头部110的宽度，即，与植毛面111平行且与把手部130的长度方向垂直相交的方向上的宽度(以下，简称为宽度)没有特别限制，例如，优选5～16mm，更优选8～12mm。在上述下限值以上时，可以充分确保植入毛束114的面积，在上述上限值以下时，可以进一步提高口腔内操作性。The width of thehead 110, that is, the width (hereinafter, referred to as width) in a direction parallel to the flockingsurface 111 and perpendicular to the longitudinal direction of thehandle portion 130 is not particularly limited, for example, preferably 5 to 16 mm, more preferably 8 to 10 mm. 12mm. When it is more than the above-mentioned lower limit, the area for implanting thehair bundle 114 can be sufficiently ensured, and when it is below the above-mentioned upper limit, the operability in the oral cavity can be further improved.

头部110的长度并无特别限定，例如，优选为10～33mm，更优选为12～28mm。在上述下限值以上时，能够充分确保植入毛束114的面积，在上述上限值以下时，能够进一步提高口腔内操作性。The length of thehead 110 is not particularly limited, for example, it is preferably 10 to 33 mm, and more preferably 12 to 28 mm. When it is more than the said lower limit, the area which implants thehair bundle 114 can fully be ensured, and when it is below the said upper limit, the operability in an oral cavity can be further improved.

头部110的厚度可以考虑材质等来决定，例如，更优选为2.0～4.0mm。在上述下限值以上时，可以进一步提高头部110的强度，在上述上限值以下时，可以提高到达后牙的到达性，同时可以进一步提高口腔内操作性。The thickness of thehead portion 110 can be determined in consideration of materials and the like, and is, for example, more preferably 2.0 to 4.0 mm. When it is more than the above-mentioned lower limit, the strength of thehead 110 can be further increased, and when it is below the above-mentioned upper limit, the reachability to the posterior teeth can be improved, and the operability in the oral cavity can be further improved.

为了在将头部110插入口腔内时让颈部120接触嘴唇，颈部120的长度例如优选25～70mm。In order for theneck 120 to contact the lips when thehead 110 is inserted into the oral cavity, the length of theneck 120 is preferably 25 to 70 mm, for example.

颈部120的宽度形成为：从最小值的位置向着后端侧方向，恒定或逐渐变大。颈部120的宽度从最小值的位置向着后端侧方向恒定的情况下，最小值的位置定义为最前端侧的位置。本实施方式中的颈部120形成为：其宽度随着从最小值的位置121向着后端侧方向逐渐变大。颈部120的宽度可以考虑材质等来决定，例如，颈部120的最小宽度优选3.5mm以上、4.5mm以下，更优选3.7mm以上、4.3mm以下。在上述下限值以上时，可以进一步提高颈部120的强度，在上述上限值以下时，嘴唇容易闭合，此外，可以提高达到后牙的到达性，同时可以进一步提高口腔内操作性。The width of theneck portion 120 is formed to be constant or gradually increase from the minimum position toward the rear end side. When the width of theneck portion 120 is constant from the position of the minimum value toward the rear end side, the position of the minimum value is defined as the position on the front end side. Theneck portion 120 in this embodiment is formed such that its width gradually increases from theminimum position 121 toward the rear end side. The width of theneck 120 can be determined in consideration of materials, for example, the minimum width of theneck 120 is preferably not less than 3.5 mm and not more than 4.5 mm, more preferably not less than 3.7 mm and not more than 4.3 mm. When the value is above the lower limit, the strength of theneck 120 can be further increased, and when it is below the upper limit, the lips can be easily closed, and the accessibility to the posterior teeth can be improved, and the operability in the oral cavity can be further improved.

另外，设颈部120中的宽度为W mm、与植毛面111垂直相交的方向上的厚度为Dmm时，以颈部120的宽度为最小值的位置121为起点，与植毛面111平行地，在后端侧相距10mm的位置122处的由D/W求得的值优选为0.7以上、2.5以下，更优选为0.7以上、2.0以下，进一步优选为0.8以上、2.0以下，特别优选为0.8以上、1.5以下。In addition, when the width in theneck 120 is W mm, and the thickness in the direction perpendicular to the hair-planting surface 111 is Dmm, the width of theneck 120 is theminimum position 121 as a starting point, parallel to the hair-planting surface 111, The value obtained from D/W at theposition 122 at a distance of 10 mm from the rear end side is preferably 0.7 or more and 2.5 or less, more preferably 0.7 or more and 2.0 or less, still more preferably 0.8 or more and 2.0 or less, particularly preferably 0.8 or more , Below 1.5.

颈部120的最小宽度为3.5mm以上、4.5mm以下的情况中，由D/W求得的值小于上述下限值时，存在刷扫时颈部120容易挠曲、操作性降低的可能性，同时，存在颈部120变宽幅、操作性受损，而且外观上头部110的薄度也不显著，商品的印象也受损的可能性。When the minimum width of theneck 120 is 3.5 mm or more and 4.5 mm or less, if the value obtained from D/W is less than the above lower limit, theneck 120 may be easily bent during brushing and operability may be reduced. , At the same time, there is a possibility that theneck 120 is widened, operability is impaired, and the thinness of thehead 110 is not conspicuous in appearance, and the impression of the product may also be impaired.

另一方面，由D/W求得的值超过上述上限值的情况下，存在厚度D变大、刷扫咬合面时嘴唇难以闭合的可能性。此外，存在通过使头部110变薄而得到的操作性提高的效果受损的可能性。因此，由D/W求得的值为0.7以上、2.5以下时，一边维持通过使头部110变薄而得到的操作性提高，一边容易闭合嘴唇进行刷扫。On the other hand, when the value obtained from D/W exceeds the above-mentioned upper limit, the thickness D becomes large, and it may be difficult to close the lips when brushing the occlusal surface. In addition, there is a possibility that the effect of improving operability obtained by making thehead portion 110 thinner is impaired. Therefore, when the value obtained from D/W is not less than 0.7 and not more than 2.5, it is easy to brush with the lips closed while maintaining the improved operability obtained by making thehead 110 thinner.

另外，以颈部120中的宽度为最小值的位置121为起点，在后端侧相距20mm的位置处的由D/W求得的值超过1.0，优选为1.3以下，更优选为1.05以上、1.2以下。同样地，以颈部120中的宽度为最小值的位置121为起点，在后端侧相距30mm的位置处的由D/W求得的值超过1.0，优选为1.5以下，更优选为1.05以上、1.3以下。In addition, starting from theposition 121 where the width of theneck 120 is the minimum value, the value obtained by D/W at a position 20 mm away from the rear end side exceeds 1.0, preferably 1.3 or less, more preferably 1.05 or more, Below 1.2. Similarly, starting from theposition 121 where the width of theneck 120 is the minimum value, the value obtained by D/W at a position 30 mm away from the rear end side exceeds 1.0, preferably 1.5 or less, more preferably 1.05 or more , Below 1.3.

通过以颈部120中的宽度为最小值的位置121为起点，在后端侧相距20mm的位置处，使厚度D大于宽度W，据此可以抑制由颈部120易于挠曲而导致的操作性降低，同时可以抑制颈部120变宽而损害操作性。像这样地，该位置处的由D/W求得的值在上述范围时，即使是颈部120的该位置插入口腔内的情况下，也可以无难以闭合嘴唇地确保操作性提高的效果。以宽度为最小值的位置121为起点，在后端侧相距30mm的位置处的由D/W求得的值在上述范围时，可以不考虑难以闭合嘴唇地确保操作性提高的效果。By making the thickness D larger than the width W at a position 20 mm away from the rear end side starting from theposition 121 where the width of theneck 120 is the smallest value, it is possible to suppress operability caused by theneck 120 being easily bent. It is possible to prevent theneck 120 from widening and impairing operability. In this way, when the value obtained from D/W at this position is within the above range, even when theneck 120 is inserted into the oral cavity at this position, the effect of improving operability can be ensured without making it difficult to close the lips. When the value obtained from D/W at the position 30 mm away from the rear end side starting from theposition 121 where the width is the smallest value is within the above range, the effect of improving operability can be ensured regardless of the difficulty in closing the lips.

另外，在位置121处由上述D/W求得的值与在以位置121为起点在后端侧相距20mm的位置处由上述D/W求得的值之差优选为0.05以上、0.07以下，更优选为0.06以上、0.07以下。由上述D/W求得的值之差小于上述下限值时以及超过上述上限值时，存在出现与由D/W求得的值小于上述下限值时和由D/W求得的值超过上述上限值时相同的不良状况的可能性。因此，在位置121处由上述D/W求得的值与在以位置121为起点在后端侧相距20mm的位置处由上述D/W求得的值之差为0.05以上、0.07以下时，一边维持通过使头部110变薄而获得的操作性提高，一边容易闭合嘴唇进行刷扫。In addition, the difference between the value obtained by the above-mentioned D/W at theposition 121 and the value obtained by the above-mentioned D/W at a position 20 mm away from the rear end side starting from theposition 121 is preferably 0.05 or more and 0.07 or less, More preferably, it is 0.06 or more and 0.07 or less. When the difference between the value obtained from the above D/W is less than the above lower limit and when it exceeds the above upper limit, there may be a difference between the value obtained from D/W less than the above lower limit and the value obtained from D/W. Possibility of the same bad condition when the value exceeds the above upper limit value. Therefore, when the difference between the value obtained from the above-mentioned D/W at theposition 121 and the value obtained from the above-mentioned D/W at a position 20 mm away from the rear end side from theposition 121 is 0.05 or more and 0.07 or less, While maintaining the improved operability obtained by making thehead 110 thinner, it is easy to brush with the lips closed.

另外，优选地，在以位置121为起点在后端侧相距30mm的位置处由上述D/W求得的值大于在位置121处由上述D/W求得的值，且它们之间的差在0.1以上、0.2以下。在以位置121为起点在后端侧相距30mm的位置处由上述D/W求得的值与在位置121处由上述D/W求得的值满足上述关系时，容易维持通过使头部110变薄而获得的操作性提高，同时容易闭合嘴唇进行刷扫。In addition, preferably, the value obtained from the above D/W at a position 30 mm apart on the rear end side from theposition 121 is larger than the value obtained from the above D/W at theposition 121, and the difference between them More than 0.1 and less than 0.2. When the value obtained from the above-mentioned D/W at a position 30 mm away from the rear end side from theposition 121 and the value obtained from the above-mentioned D/W at theposition 121 satisfy the above-mentioned relationship, it is easy to maintain The maneuverability obtained by thinning is improved, and at the same time, it is easy to close the lips for brushing.

另外，关于对于把手部130的长度方向，以前端侧的位置为基准、后端侧的位置的上述D/W的变化率，设上述颈部120中的宽度为最小值的位置121的后端侧距离10mm的位置的上述D/W的变化率为R01时，变化率R01超过1.00，优选为1.2以下。设位置121的后端侧距离20mm的位置的上述D/W的变化率为R02时，变化率R02超过1.00，优选为1.2以下。设位置121的后端侧距离30mm的位置的上述D/W的变化率为R03时，变化率R03超过1.00，优选为1.3以下。优选地，变化率R01、R02、R03满足R01<R02<R03的关系。In addition, regarding the change rate of the above-mentioned D/W at the position on the rear end side with respect to the longitudinal direction of thehandle part 130 based on the position on the front end side, the rear end of theposition 121 where the width of theneck 120 is the minimum value is assumed to be When the above-mentioned D/W change rate R01 at the side distance of 10 mm is greater than 1.00, it is preferably 1.2 or less. When the above-mentioned D/W change rate R02 at a position 20 mm away from the rear end side of theposition 121 is assumed, the change rate R02 exceeds 1.00, and is preferably 1.2 or less. When the change rate of D/W at the position 30 mm away from the rear end side of theposition 121 is R03, the change rate R03 exceeds 1.00, and is preferably 1.3 or less. Preferably, the rate of change R01, R02, R03 satisfies the relationship of R01<R02<R03.

据此，在更容易进入口腔内的颈部120的前端侧，厚度D已经较大，可以回避难以闭合嘴唇进行刷扫的状况。另外，在由刷扫带来的负荷容易施加的颈部120的后端部侧，进一步使厚度D变大，据此可以回避起因于厚度D方向的过度挠曲而导致的操作性的不良状况。Accordingly, at the front end side of theneck 120 which is easier to enter the oral cavity, the thickness D is already relatively large, and the situation that it is difficult to close the lips for brushing can be avoided. In addition, by further increasing the thickness D on the rear end side of theneck 120 where the load due to brushing is likely to be applied, operability problems caused by excessive deflection in the direction of the thickness D can be avoided. .

另外，设从以位置121为起点在后端侧相距10mm的位置起计，以位置121为起点在后端侧相距20mm的位置的上述D/W的变化率为R12时，变化率R12超过1.00，优选在1.2以下。设从以位置121为起点在后端侧相距20mm的位置起计，以位置121为起点在后端侧相距30mm的位置的上述D/W的变化率为R23时，变化率R23超过1.00，优选在1.3以下。优选地，变化率R12、R23满足R01≤R12≤R23的关系。此外，优选地，变化率R12、R23中的至少一个大于变化率R01。In addition, when the change rate of D/W at a position 20 mm away from the rear end side starting fromposition 121 is R12 from a position 10 mm away from the rear end side starting fromposition 121, the change rate R12 exceeds 1.00 , preferably below 1.2. When the change rate of D/W at the position 30 mm apart from theposition 121 is R23 from the position 20 mm away from the rear end side starting from theposition 121, the rate of change R23 exceeds 1.00, preferably Below 1.3. Preferably, the rate of change R12, R23 satisfies the relationship of R01≦R12≦R23. Furthermore, preferably, at least one of the rates of change R12, R23 is greater than the rate of change R01.

据此，与上述同样地，在更容易进入口腔内的颈部120的前端侧，厚度D已经较大，可以回避难以闭合嘴唇进行刷扫的状况。另外，在由刷扫带来的负荷容易施加的颈部120的后端部侧，进一步使厚度D变大，据此可以回避起因于厚度D方向的过度挠曲而导致的操作性的不良状况。Accordingly, similarly to the above, at the front end side of theneck 120 which is easier to enter the oral cavity, the thickness D is already large, and it is possible to avoid the situation where it is difficult to close the lips for brushing. In addition, by further increasing the thickness D on the rear end side of theneck 120 where the load due to brushing is likely to be applied, operability problems caused by excessive deflection in the direction of the thickness D can be avoided. .

另外，已知一般在材质相同的情况下，刚体的挠曲量受到“截面二次矩”的极大影响。由于挠曲量与宽度W的1次乘方、厚度D的3次乘方成比例，故而为了减少挠曲量，优选一边保持厚度D，一边使宽度为最低限度。In addition, it is known that generally when the material is the same, the amount of deflection of a rigid body is greatly influenced by the "second moment of section". Since the amount of deflection is proportional to the first power of the width W and the third power of the thickness D, it is preferable to minimize the width while maintaining the thickness D in order to reduce the amount of deflection.

例如，设挠曲系数M(mm⁴)＝W×D³时，由在颈部120的位置121处的宽度W、厚度D计算出的挠曲系数M优选165mm⁴以上、625mm⁴以下，进一步优选180mm⁴以上、525mm⁴以下，特别优选200mm⁴以上、330mm⁴以下。此外，由颈部120的位置122处的宽度W、厚度D计算出的挠曲系数M为165mm⁴以上、625mm⁴以下，更优选180mm⁴以上、525mm⁴以下，进一步优选200mm⁴以上、330mm⁴以下，进一步优选270mm⁴以上、310mm⁴以下。优选地，在从位置121起与植毛面111平行地在后端侧相距20mm的位置处，由颈部120中的宽度W、厚度D计算出的挠曲系数M为350mm⁴以上、550mm⁴以下。优选地，在从位置121起与植毛面111平行地在后端侧相距30mm的位置处，由颈部120中的宽度W、厚度D计算出的挠曲系数M为600mm⁴以上、1500mm⁴以下。For example, when the deflection coefficient M (mm⁴ )=W×D³ , the deflection coefficient M calculated from the width W and the thickness D at theposition 121 of theneck 120 is preferably 165 mm⁴ or more and 625 mm⁴ or less, and further It is preferably 180 mm⁴ or more and 525 mm⁴ or less, particularly preferably 200 mm⁴ or more and 330 mm⁴ or less. In addition, the deflection coefficient M calculated from the width W and thickness D at theposition 122 of theneck 120 is not less than 165 mm⁴ and not more than 625 mm⁴ , more preferably not less than 180 mm⁴ and not more than 525 mm⁴ , still more preferably not less than 200 mm⁴ and not more than 330 mm⁴ Below, more preferably 270 mm⁴ or more and 310 mm⁴ or less. Preferably, the deflection coefficient M calculated from the width W and thickness D in theneck 120 is 350 mm⁴ or more and 550 mm⁴ or less at a position 20 mm away from the rear end side parallel to the flockingsurface 111 from theposition 121 . Preferably, the deflection coefficient M calculated from the width W and thickness D in theneck 120 is 600 mm⁴ or more and 1500 mm⁴ or less at a position 30 mm away from the rear end side parallel to the flockingsurface 111 from theposition 121 .

位置122处的挠曲系数M在165mm⁴以上、625mm⁴以下时，可以有助于嘴唇闭合时的刷扫性提高，同时可以防止由过度挠曲导致的操作性恶化。When the deflection coefficient M at theposition 122 is not less than 165 mm⁴ and not more than 625 mm⁴ , it can contribute to the improvement of brushing performance when the lips are closed, and can prevent deterioration of operability due to excessive deflection.

作为挠曲系数M的变化率，在位置121和位置122之间，优选1.0以上、1.3以下。此外，作为在位置122与位置121的后端侧距离20mm的位置之间的挠曲系数M的变化率，优选1.3以上、1.8以下。作为位置121的后端侧距离20mm的位置与位置121的后端侧距离30mm的位置之间的挠曲系数M的变化率，优选1.7以上、3.0以下，更优选1.8以上、3.0以下。此外，所述变化率是后端侧的位置处的挠曲系数除以前端侧的位置处的挠曲系数所得到的值，例如，在位置121和位置122之间，根据位置121处的挠曲系数M和位置122处的挠曲系数M，作为M/M而算出的值。The rate of change of the deflection coefficient M is preferably 1.0 or more and 1.3 or less between theposition 121 and theposition 122 . In addition, the rate of change of the deflection coefficient M between theposition 122 and the position 20 mm from the rear end side of theposition 121 is preferably 1.3 or more and 1.8 or less. The rate of change of the deflection coefficient M between the position 20 mm from the rear end side of theposition 121 and the position 30 mm from the rear end side of theposition 121 is preferably 1.7 or more and 3.0 or less, more preferably 1.8 or more and 3.0 or less. In addition, the rate of change is a value obtained by dividing the deflection coefficient at the position of the rear end side by the deflection coefficient at the position of the front end side, for example, between theposition 121 and theposition 122, according to the deflection coefficient at theposition 121 The curvature coefficient M and the curvature coefficient M at theposition 122 are values calculated as M/M.

挠曲系数M及其变化率在上述范围时，容易无导致操作性降低地，闭合嘴唇而进行刷扫。When the deflection coefficient M and its rate of change are in the above-mentioned ranges, it is easy to close the lips and perform brushing without degrading operability.

毛束114束有多根刷毛。从植毛面111到毛束114的前端的长度(毛长)，可考虑毛束114所需的刷毛刚度等来决定，例如可为6～13mm。全部毛束114可为相同毛长，或者可为相互不同的毛长。Hair bundle 114 has a plurality of bristles. The length (hair length) from the flockingsurface 111 to the tip of thebristle bundle 114 can be determined in consideration of the bristle stiffness required for thebristle bundle 114, and can be, for example, 6 to 13 mm. All of thetufts 114 may be of the same hair length, or may be of mutually different hair lengths.

毛束114的粗细(毛束直径)可考虑毛束114所需的刷毛刚度等来决定，例如可为1～3mm。全部毛束114可为相同的毛束直径，或者可为相互不同的毛束直径。The thickness of the bristle bundle 114 (bristle bundle diameter) can be determined in consideration of the bristle stiffness required for thebristle bundle 114 and the like, and can be, for example, 1 to 3 mm. Alltufts 114 may be the same tuft diameter, or may be different tuft diameters from each other.

作为构成毛束114的刷毛，可举例如，向着刷毛前端直径逐渐减小、刷毛前端被尖锐化的刷毛(锥形刷毛)，从植毛面111向着刷毛前端、其直径基本相同的刷毛(直形刷毛)等。作为直形刷毛，可列举：刷毛前端为与植毛面111大致平行的平面者，或者刷毛前端球形化为半球状者。As the bristles that constitute thehair bundle 114, for example, the bristles (tapered bristles) whose diameter gradually decreases toward the bristle front end and the bristle front end is sharpened, and the bristles (straight bristles) whose diameter is substantially the same from the hair-planting surface 111 toward the bristle front end. bristles), etc. Examples of the straight bristles include those in which the tip of the bristle is a plane substantially parallel to the hair-implantedsurface 111 , or a tip of the bristle that is spheroidized into a hemispherical shape.

刷毛的材质，可举例如，6-12尼龙(6-12NY)、6-10尼龙(6-10NY)等聚酰胺、PET、PBT、聚对苯二甲酸丙二醇酯(PTT)、聚萘二甲酸乙二醇酯(PEN)以及聚萘二甲酸丁二醇酯(PBN)等聚酯、PP等聚烯烃、聚烯烃系弹性体、苯乙烯系弹性体等弹性体树脂等。这些树脂材料可以单独使用1种或者组合使用2种以上。此外，作为刷毛，可列举具有多重芯构造的由聚酯制成的刷毛，该多重芯构造具有：芯部和设置在该芯部外侧的至少1层以上的鞘部。The material of bristles can be, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), PET, PBT, polytrimethylene terephthalate (PTT), polynaphthalate Polyesters such as ethylene glycol ester (PEN) and polybutylene naphthalate (PBN), polyolefins such as PP, elastomeric resins such as polyolefin-based elastomers, and styrene-based elastomers. These resin materials may be used alone or in combination of two or more. In addition, examples of bristles include polyester bristles having a multi-core structure including a core and at least one sheath provided outside the core.

刷毛的横截面形状没有特别限定，可设定为正圆形、椭圆形等圆形、多边形、星形、三片叶的三叶草形、四片叶的四叶草形等。全部刷毛的截面形状可相同或者可不同。The cross-sectional shape of the bristles is not particularly limited, and may be a circle such as a perfect circle, an ellipse, a polygon, a star, a three-leaf clover, a four-leaf four-leaf clover, or the like. The cross-sectional shape of all bristles may be the same or may be different.

刷毛的粗细可以考虑材质等来决定，在横截面为圆形时，例如可设定为6～9mil(1mil＝1/1000inch＝0.025mm)。此外，考虑使用感、刷扫感、清扫效果、耐久性等，可将粗细不同的多根刷毛任意组合使用。The thickness of the bristles can be determined in consideration of the material and the like, and when the cross section is circular, for example, it can be set to 6-9 mil (1 mil=1/1000inch=0.025mm). In addition, considering the usability, brushing feeling, cleaning effect, durability, etc., multiple bristles with different thicknesses can be used in any combination.

牙刷11的制造方法首先通过注射成型来成型把手体12。The manufacturing method of thetoothbrush 11 first molds thehandle body 12 by injection molding.

然后，将毛束114植入所得到的把手体12的头部110中。作为毛束114的植毛方法，可列举：将毛束114一折为二，将夹入其间的扁平线打入植毛孔112，由此植入毛束114的扁平线(flat plate)式植毛；将毛束114的下端压入成为植毛部的熔融树脂中并固定的热熔融粘合法；将毛束114的下端加热，形成溶融块后，向模具中注入熔融树脂，成形植毛部的模内法(in-mold process)等。Then, thehair bundle 114 is implanted into thehead 110 of the resultinghandle body 12 . As the method of hair transplantation of thehair bundle 114, it can be enumerated: thehair bundle 114 is folded into two, and the flat wire sandwiched therebetween is punched into thehair transplantation hole 112, thereby implanting thehair bundle 114 into a flat wire (flat plate) type hair transplantation; The thermal fusion bonding method in which the lower end of thehair bundle 114 is pressed into the molten resin that becomes the hair-planting part and fixed; the lower end of thehair bundle 114 is heated to form a molten mass, and then molten resin is injected into the mold to form the hair-planting part. In-mold method (in-mold process) and so on.

如上所述，根据本实施方式的牙刷11，一方面通过使颈部120中的最小宽度为3.5mm以上、4.5mm以下，从而确保容易闭合嘴唇进行刷扫的状态，另一方面通过使由D/W求得的值为0.7以上、2.5，从而聚缩醛等的工程塑料自不必说，即使是使用聚丙烯等通用树脂的情况也可避免操作性降低。As described above, according to thetoothbrush 11 of the present embodiment, on the one hand, by setting the minimum width of theneck 120 to 3.5 mm or more and 4.5 mm or less, it is possible to ensure a state where the lips are easily closed for brushing, and on the other hand, by making the The obtained value of /W is 0.7 or more and 2.5, so that not only engineering plastics such as polyacetal, but also general-purpose resins such as polypropylene can be used to avoid deterioration of workability.

在扁平线式植毛的情况下，对头部110施加了打入扁平线带来的压力。一方面，头部110较薄，针对施力时的变形的强度较低，另一方面，颈部120较粗、强度较高的情况下，有时会出现下述情况：刷牙时的压力集中于头部110，头部110的翘曲变大、使用性降低。与此相对，根据本实施方式的牙刷11，通过使颈部120变细，使其带有一定程度的挠曲性，因而可以将刷牙时的压力从头部110分散至颈部120整体，使用性提高。因此，在扁平线式植毛的情况下，可以特别显著地获得本发明的效果。In the case of the flat wire type hair transplant, thehead 110 is subjected to pressure due to driving the flat wire. On the one hand, thehead 110 is thin and has low strength against deformation when a force is applied. On the other hand, when theneck 120 is thick and strong, the pressure during brushing may be concentrated on the Thehead 110, the warpage of thehead 110 increases, and the usability decreases. On the other hand, according to thetoothbrush 11 of this embodiment, by making theneck 120 thinner, it has a certain degree of flexibility, so the pressure during brushing can be distributed from thehead 110 to theentire neck 120, and it can be used sexual enhancement. Therefore, in the case of flat wire type hair transplantation, the effect of the present invention can be obtained particularly remarkably.

[实施例][Example]

以下，列举实施例，详细地说明本发明，但本发明并不限于以下实施例，可以在不脱离其要旨的范围内适当地变更实施。Hereinafter, examples are given and the present invention will be described in detail, but the present invention is not limited to the following examples, and can be appropriately changed and implemented within a range not departing from the gist thereof.

[表1][Table 1]

(实施例1～实施例5、比较例1～比较例7)(Example 1 to Example 5, Comparative Example 1 to Comparative Example 7)

按照上述[表1]所示的规格，制作形成有颈部120的实施例1～以及比较例1～比较例7的牙刷。头部以及把手部的宽度、长度、厚度、形状全部相同。将PP树脂注射成型，得到图3～4中记载的头部和把手体的一体成型物(从头部的前端起向着把手体，植毛孔的排列为3孔×1列、4孔×6列、3孔×1列。头部的宽度为10mm、长度为25mm、厚度为3.0mm。把手体的长度为110mm。颈部的长度为48mm)。将由PBT制成的长丝形成的锥形刷毛(7.5mil)的毛束通过扁平线式植毛来植入头部，制作牙刷。The toothbrushes of Examples 1 to 7 and Comparative Examples 1 to 7 in which theneck portion 120 was formed were prepared according to the specifications shown in [Table 1] above. The width, length, thickness, and shape of the head and the handle are all the same. The PP resin is injection molded to obtain the integrated molding of the head and the handle body described in Figures 3-4 (from the front end of the head to the handle body, the arrangement of the hair-planting holes is 3 holes × 1 row, 4 holes × 6 rows , 3 holes × 1 column. The width of the head is 10mm, the length is 25mm, and the thickness is 3.0mm. The length of the handle body is 110mm. The length of the neck is 48mm). A bundle of tapered bristles (7.5 mil) formed of filaments made of PBT was implanted in the head by flat wire hair transplantation to produce a toothbrush.

各例中的颈部的宽度为最小的位置、该最小位置的后端侧距离10mm、20mm、30mm的各位置中的由D/W求得的值、由W×D³求得的值示于[表2]。此外，由各例中的由W×D³求得的值的如上述所述地各位置的挠曲系数计算出的变化率示于[表3]。另外，各例中的由D/W求得的值的变化率示于[表4]。In each example, the position where the width of the neck is the smallest, the value obtained by D/W, and the value obtained by W×D³ at the positions at which the distance from the rear end side of the minimum position is 10 mm, 20 mm, and 30 mm are shown. in [Table 2]. In addition, the rate of change calculated from the deflection coefficient at each position as described above of the value obtained from W×D³ in each example is shown in [Table 3]. In addition, the rate of change of the value obtained from D/W in each example is shown in [Table 4].

(评价方法)(Evaluation method)

对于各例的牙刷，用下述方法评价“牙刷的口腔内操作性(在口中的移动容易性)”。About the toothbrush of each example, the "intraoral operability (easiness of movement in the mouth) of the toothbrush" was evaluated by the following method.

＜牙刷的操作性＞＜Operation of the toothbrush＞

对于牙刷的操作性，专业实验组10人使用各例的牙刷，按照下述评价基准评价“口腔内操作性”。专业实验组10人的平均分在2.5分以上为“◎”，平均分在2.0分以上且小于2.5分为“○”，平均分在1.5分以上且小于2.0分为“△”，平均分小于1.5分为“×”。Regarding the operability of the toothbrush, 10 persons in the professional experiment group used the toothbrush of each example, and evaluated "intraoral operability" according to the following evaluation criteria. The average score of 10 people in the professional experimental group is above 2.5 as "◎", the average score above 2.0 and less than 2.5 is "○", the average score is above 1.5 and less than 2.0 is "△", and the average score is less than 2.0 1.5 is divided into "×".

《评价基准》"Evaluation Criteria"

3分：非常能感觉到在口中的移动容易性。3 points|pieces: Ease of movement in the mouth can be felt very much.

2分：感觉到在口中的移动容易性。2 points: Ease of movement in the mouth is felt.

1分：不太能感觉到在口中的移动容易性。1 point: Ease of movement in the mouth cannot be felt so much.

0分：感觉不到在口中的移动容易性。0 points: Ease of movement in the mouth is not felt.

[表2][Table 2]

[表3][table 3]

宽度×厚度³[W×D³]的变化率Rate of change of width x thickness³ [W x D³ ]

[表4][Table 4]

如表2所示，可以确认：头部的厚度为2.0～4.0mm，颈部的宽度的最小值为3.5mm以上、4.5mm以下，在颈部中的最小值的位置的后端侧距离10mm的位置处的由D/W求得的值为0.7以上、2.5以下，且在宽度为最小值的位置121处由D/W求得的值、与在位置121的后端侧距离20mm的位置处由D/W求得的值之差为0.05以上，挠曲系数M(mm⁴)＝W×D³为165mm⁴以上、625mm⁴以下，在位置121的后端侧距离20mm的位置处的由D/W求得的值超过1.0，在位置121的后端侧距离30mm的位置处的由D/W求得的值大于在位置121处由D/W求得的值，且两者之差在0.1以上时，可以获得良好的操作性。As shown in Table 2, it can be confirmed that the thickness of the head is 2.0 to 4.0 mm, the minimum width of the neck is between 3.5 mm and 4.5 mm, and the distance from the rear end of the minimum value in the neck is 10 mm. The value obtained by D/W at the position of 0.7 to 2.5, and the value obtained by D/W atposition 121 where the width is the minimum value, and the position 20 mm away from the rear end side ofposition 121 The difference between the values obtained from D/W is 0.05 or more, the deflection coefficient M(mm⁴ )=W×D³ is 165 mm⁴ or more and 625 mm⁴ or less, and the distance from the rear end side ofposition 121 is 20 mm. The value obtained by D/W exceeds 1.0, the value obtained by D/W at a position 30 mm from the rear end side ofposition 121 is greater than the value obtained by D/W atposition 121, and the difference between the two When the difference is 0.1 or more, good operability can be obtained.

另外，如表4所示地，可以确认：变化率R01、R02、R03、R12、R13分别超过1.00，此外满足R01<R02<R03的关系、R01≤R12≤R23的关系时，也可以获得良好的操作性。In addition, as shown in Table 4, it can be confirmed that the rate of change R01, R02, R03, R12, and R13 exceeds 1.00 respectively, and also satisfies the relationship of R01<R02<R03 and the relationship of R01≤R12≤R23, and good results can be obtained. operability.

以上，一边结合附图，一边对本发明所涉及的适宜的实施方式进行说明，但本发明不限于所涉及的例子这是自不必言的。上述例子中所示的各结构部件的各种形状或组合等仅为一例，在不偏离本发明主旨的范围内，可基于设计要求等进行各种变更。As mentioned above, although the preferred embodiment which concerns on this invention was demonstrated with reference to drawing, it goes without saying that this invention is not limited to this example. The various shapes or combinations of the components shown in the above examples are just examples, and various changes can be made based on design requirements and the like without departing from the gist of the present invention.

例如，上述实施方式的牙刷11中，示例了颈部120从最小宽度的位置向着后端侧宽度逐渐变大的结构，但并不限于该结构，也可为以相同宽度向着后端侧延伸的结构。即便是颈部120以相同宽度向着后端侧延伸的结构，也优选在最小宽度的位置的后端侧距离10mm的位置处的由D/W求得的值为0.7以上、2.5以下。For example, in thetoothbrush 11 of the above-mentioned embodiment, the structure in which the width of theneck 120 gradually increases from the position of the minimum width toward the rear end side is illustrated, but it is not limited to this structure, and it may be extended toward the rear end side with the same width. structure. Even if theneck portion 120 extends toward the rear end with the same width, it is preferable that the value obtained by D/W at a position 10 mm from the rear end side of the minimum width is 0.7 or more and 2.5 or less.