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TWI770960B - Toothbrush - Google Patents

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Publication number
TWI770960B
TWI770960B TW110115027A TW110115027A TWI770960B TW I770960 B TWI770960 B TW I770960B TW 110115027 A TW110115027 A TW 110115027A TW 110115027 A TW110115027 A TW 110115027A TW I770960 B TWI770960 B TW I770960B
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Taiwan
Prior art keywords
head
neck
hair
amount
height
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TW110115027A
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Chinese (zh)
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TW202130301A (en
Inventor
金丸直史
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日商獅子股份有限公司
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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0054—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body
    • A46B5/0062—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions designed to allow relative positioning of the head to body being flexible or resilient during use
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
    • A46B5/021—Grips or handles specially adapted to conform to the hand
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

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  • Brushes (AREA)

Abstract

本發明提供一種清掃力更優異、且使用感更優異的牙刷。一種牙刷（1），其特徵在於：包括具備頭部（2）、延伸設置於該頭部（2）的頸部（4）、及延伸設置於該頸部（4）的柄部（6）的柄體（10），並於頭部（2）的植毛面上植設有毛束，且藉由特定的測定方法所測定的所述頭部（2）的彎曲量A與所述頸部（4）的彎曲量B的積為0.8～10。The present invention provides a toothbrush having more excellent cleaning power and more excellent feeling in use. A toothbrush (1), characterized in that it comprises a head portion (2), a neck portion (4) extending from the head portion (2), and a handle portion (6) extending from the neck portion (4). The handle body (10) of the head (10), and a hair bundle is implanted on the hair-implanting surface of the head (2), and the bending amount A of the head (2) and the neck are measured by a specific measurement method. The product of the bending amount B of (4) is 0.8 to 10.

Description

牙刷toothbrush

本發明是有關於一種牙刷。 本申請案基於2016年3月9日在日本申請的日本專利特願2016-045368號並主張優先權，且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. 2016-045368 filed in Japan on March 9, 2016, and the content is incorporated herein by reference.

於預防齲齒、牙周病時，重要的是藉由使用牙刷的刷牙來去除口腔內的牙菌斑（plaque）。先前，為了提高牙菌斑去除效果，提出有各種牙刷。例如，藉由使牙刷的頭部變薄，並使頸部變細，而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）。於專利文獻1中記載有一種頭部經薄型化、且於口腔內的操作性優異的牙刷。 另一方面，對於有牙周疾病的生活者等而言，藉由使用牙刷的刷牙來去除牙周袋（periodontal pocket）的污垢、或牙齦的按摩變得重要。於去除牙周袋的污垢、或牙齦的按摩時，需要牙刷毛的適度的彎曲，迄今為止提出有使直徑細的牙刷毛密集的牙刷、或使用前端極細毛等的牙刷。 [現有技術文獻] [專利文獻]In preventing dental caries and periodontal disease, it is important to remove plaque in the oral cavity by brushing with a toothbrush. Conventionally, various toothbrushes have been proposed in order to improve the plaque removal effect. For example, by thinning the head of the toothbrush and thinning the neck, the bristles of the toothbrush can reach the depths of the molars (the throat side of the molars) which are difficult to reach with a normal toothbrush. Patent Document 1 describes a toothbrush having a thin head portion and excellent operability in the oral cavity. On the other hand, for people with periodontal disease, it is important to remove dirt from periodontal pockets or to massage the gums by brushing with a toothbrush. To remove the dirt from the periodontal pocket or massage the gums, moderate bending of the bristles is required, and a toothbrush having densely packed bristles with a small diameter or a toothbrush using ultrafine bristles at the tip has been proposed. [Prior Art Literature] [Patent Literature]

[專利文獻1]日本專利特開平7-143914號公報[Patent Document 1] Japanese Patent Laid-Open No. 7-143914

[發明所欲解決之課題] 但是，若為了提高對於通常的牙刷難以到達的臼齒的深處等的清掃力而僅使牙刷的頭部變薄，則頭部的耐折強度或毛束的脫落強度下降，且牙刷的品質下降。另外，因使頭部變薄，於使用時頭部容易彎曲且毛束擴展等而損害使用者的使用感。因此，使頭部變薄存在極限。 另外，藉由加大牙刷毛的彎曲，使對於牙齦的接觸感變得良好，而可提高使用感。但是，若牙刷毛的彎曲過大，則產生如下等問題：牙刷毛朝牙周袋中的進入性下降且清掃力下降，或毛分叉變大，牙刷的耐久性下降。[The problem to be solved by the invention] However, if only the head portion of the toothbrush is made thinner in order to increase the cleaning force for the depths of molars, which are difficult to reach with a normal toothbrush, the folding strength of the head portion and the shedding strength of the bristle bundle decrease, and the quality of the toothbrush decreases. . In addition, since the head portion is thinned, the head portion is easily bent during use, and the hair bundles spread, etc., which impair the user's feeling of use. Therefore, there is a limit to thinning the head. In addition, by increasing the curvature of the toothbrush bristles, the feeling of contact with the gums becomes good, and the feeling of use can be improved. However, when the curvature of the bristles is too large, there arise problems such as a decrease in the bristle penetration into the periodontal pocket and a decrease in cleaning power, or a large bifurcation of the bristles and a decrease in the durability of the toothbrush.

本發明是鑒於所述情況而成者，其目的在於提供一種清掃力更優異、且使用感更優異的牙刷。 [解決課題之手段]The present invention was made in view of the above-mentioned circumstances, and an object thereof is to provide a toothbrush which is more excellent in cleaning power and more excellent in usability. [Means of Solving Problems]

本發明具有以下的構成。 [1] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且藉由下述的方法（α）所測定的所述頭部的彎曲量A與藉由下述的方法（β）所測定的所述頸部的彎曲量B的積為0.8～10。所述彎曲量A為0.5～3.0，所述彎曲量B為2.1～5.0。所述頭部的厚度為2.0 mm～4.0 mm、且所述頸部的最小的寬度與最小的厚度中的小的一方為3.0 mm～4.5 mm。所述柄體的材質為聚丙烯樹脂。 方法（α）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [2] 如[1]所述的牙刷，其中所述頭部的彎曲量A與所述頸部的彎曲量B的積為2～10。 [3] 如[1]或[2]所述的牙刷，其中藉由下述的方法（α'）所測定的所述頭部的彎曲量A'與所述頸部的彎曲量B的積為2.5～12。 方法（α'）：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10 mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A'。 [4] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且藉由下述的方法（α'）所測定的所述頭部的彎曲量A'與藉由下述的方法（β）所測定的所述頸部的彎曲量B的積為2.5～12。所述彎曲量A'為1～5，所述彎曲量B為2.1～5.0。所述頭部的厚度為2.0 mm～4.0 mm、且所述頸部的最小的寬度與最小的厚度中的小的一方為3.0 mm～4.5 mm。所述柄體的材質為聚丙烯樹脂。 方法（α'）：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10 mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A'。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [5] 如[1]、[2]或[4]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.5 mm。 [6] 如[1]、[2]或[4]所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7 N～3.0 N。 [7] 如[3]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.5 mm。 [8] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛。所述頭部的厚度為2.0 mm～4.0 mm。所述頸部的最小的寬度為3.0 mm～4.5 mm，最小的厚度為3.0 mm～4.5 mm。藉由下述的方法（α'）所測定的所述頭部的彎曲量A'與藉由下述的方法（β）所測定的所述頸部的彎曲量B的積為2.5～12。所述彎曲量A'為1～5 mm。所述彎曲量B與所述彎曲量A'的比（B/A'）為0.8～2.5。 方法（α'）：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10 mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A'。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [9] 如[8]所述的牙刷，其中所述頭部的彎曲量A'與所述頸部的彎曲量B的積為2.5～10。 [10] 如[8]或[9]所述的牙刷，其中所述彎曲量B與所述彎曲量A'的比（B/A'）為0.8～2.0。 [11] 如[8]或[9]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.2 mm。 [12] 如[8]或[9]所述的牙刷，其中所述彎曲量B為2.1～5.0 mm。 [13] 如[8]或[9]所述的牙刷，其中藉由下述的方法（α）所測定的所述頭部的彎曲量A與所述頸部的彎曲量B的積為2～10。 方法（α）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A。 [14] 如[13]所述的牙刷，其中所述彎曲量B與所述彎曲量A的比（B/A）為1.5～5.0。 [15] 如[13]所述的牙刷，其中所述彎曲量A為0.4～3.0 mm。 [16] 如[8]或[9]所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7 N～3.0 N。 [17] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛。所述頭部的厚度為2.0 mm～4.0 mm，所述頸部的最小的寬度為3.0 mm～4.5 mm。所述柄體的材質為聚丙烯樹脂。當將藉由下述的方法（α）所測定的所述頭部的彎曲量設為A，並將藉由下述的方法（β）所測定的所述頸部的彎曲量設為B時，相對於頭部的長度（L2）的頭部的彎曲量（A/L2）的值X為0.015～0.045。相對於所述頭部的長度（L2）與頸部的長度（L3）的和（L2＋L3）的所述頸部的彎曲量（B/（L2＋L3））的值Y與所述X的比，即Y/X為0.8～2.0。 方法（α）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [18] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛。所述頭部的厚度為2.0 mm～4.0 mm，所述頸部的最小的寬度為3.0 mm～4.5 mm。所述柄體的材質為聚縮醛樹脂。當將藉由下述的方法（α）所測定的所述頭部的彎曲量設為A，並將藉由下述的方法（β）所測定的所述頸部的彎曲量設為B時，相對於頭部的長度（L2）的頭部的彎曲量（A/L2）的值X為0.027～0.035。相對於所述頭部的長度（L2）與頸部的長度（L3）的和（L2＋L3）的所述頸部的彎曲量（B/（L2＋L3））的值Y與所述X的比，即Y/X為1.0～1.4。 方法（α）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [19] 如[17]或[18]所述的牙刷，其中所述彎曲量A為0.4～3.0 mm，所述彎曲量B為2.1～5.0 mm。 [20] 如[17]或[18]所述的牙刷，其中所述頸部的最小的厚度為3.0 mm～4.5 mm。 [21] 如[17]或[18]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.2 mm。 [22] 如[20]所述的牙刷，其中所述頸部的最小的厚度為3.0 mm～4.2 mm。 [23] 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上藉由平線式植毛植設有多個毛束。所述頭部的厚度為2.0 mm～4.0 mm。所述頸部的最小的寬度與最小的厚度中的小的一方為3.0 mm～4.5 mm，並且在藉由下述的方法（α）所測定的所述頭部的彎曲量A與藉由下述的方法（β）所測定的所述頸部的彎曲量B中，所述彎曲量A為0.4～3.0 mm，所述彎曲量B為2.1～5.0 mm。所述彎曲量A與所述彎曲量B的差（B－A）為1 mm≦（B－A）≦4 mm。所述彎曲量A的以mm所表示的數值與所述彎曲量B的以mm所表示的數值的積為0.84～10。 方法（α）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A。 方法（β）：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頸部的彎曲量B。 [24] 如[23]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.5 mm，最小的厚度為3.0 mm～4.5 mm。 [25] 如[23]或[24]所述的牙刷，其中所述彎曲量A的以mm所表示的數值與所述彎曲量B的以mm所表示的數值的積為2～10。 [26] 如[23]或[24]所述的牙刷，其中所述彎曲量A為0.5～2.0 mm，所述彎曲量B為2.1～4.0 mm。 [27] 如[23]或[24]所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7 N～3.0 N。 [28] 如[23]或[24]所述的牙刷，其中所述頸部的最小的寬度為3.0 mm～4.2 mm。 [29] 如[23]或[24]所述的牙刷，其中所述柄體的材質為聚丙烯樹脂。 [發明的效果]The present invention has the following constitutions. [1] A toothbrush comprising a handle body having a head portion, a neck portion extending from the head portion, and a handle portion extending from the neck portion, and a hair-implanted surface of the head portion A hair bundle is planted on it, and the amount of curvature A of the head portion measured by the following method (α) and the amount of curvature B of the neck portion measured by the following method (β) The product is 0.8 to 10. The bending amount A is 0.5 to 3.0, and the bending amount B is 2.1 to 5.0. The thickness of the head portion is 2.0 mm to 4.0 mm, and the smaller of the minimum width and the minimum thickness of the neck portion is 3.0 mm to 4.5 mm. The handle body is made of polypropylene resin. Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the handle body in a state where the position of the boundary between the head and the neck is fixed is used as a reference The height, in the fixed state, and further with respect to the length in the long axis direction of the hair-implanted part in the head, hang a weight of 200 g at a position of 10±3% from the front end of the hair-implanted part, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount A of the head portion. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [2] The toothbrush according to [1], wherein the product of the amount of curvature A of the head portion and the amount of curvature B of the neck portion is 2 to 10. [3] The toothbrush according to [1] or [2], wherein the product of the curvature amount A' of the head portion and the curvature amount B of the neck portion measured by the following method (α') 2.5 to 12. Method (α'): The hair-implanted surface of the head is directed upward in the vertical direction, and the position is fixed by moving 10 mm from the position of the boundary between the head and the neck toward the shank. The height of the front end of the handle body in the state is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head, 10 from the front end of the hair-implanted part. A weight of 200 g was suspended at a position of ±3%, and the displacement amount (unit: mm) of the height of the front end of the handle body from the reference height after 10 seconds was defined as the bending of the head Quantity A'. [4] A toothbrush comprising a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a hair-implanted surface of the head A hair bundle is planted on it, and the amount of curvature A' of the head portion measured by the following method (α') and the amount of curvature of the neck portion measured by the following method (β) The product of B is 2.5 to 12. The said bending amount A' is 1-5, and the said bending amount B is 2.1-5.0. The thickness of the head portion is 2.0 mm to 4.0 mm, and the smaller of the minimum width and the minimum thickness of the neck portion is 3.0 mm to 4.5 mm. The handle body is made of polypropylene resin. Method (α'): The hair-implanted surface of the head is directed upward in the vertical direction, and the position is fixed by moving 10 mm from the position of the boundary between the head and the neck toward the shank. The height of the front end of the handle body in the state is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head, 10 from the front end of the hair-implanted part. A weight of 200 g was suspended at a position of ±3%, and the displacement amount (unit: mm) of the height of the front end of the handle body from the reference height after 10 seconds was defined as the bending of the head Quantity A'. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [5] The toothbrush according to [1], [2] or [4], wherein the minimum width of the neck portion is 3.0 mm to 4.5 mm. [6] The toothbrush according to [1], [2] or [4], wherein the bristle tip strength of the bristles constituting the bristle bundle is 1.7 N to 3.0 N. [7] The toothbrush according to [3], wherein the minimum width of the neck portion is 3.0 mm to 4.5 mm. [8] A toothbrush comprising a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a hair-implanted surface of the head The hair bundles are planted on the top, and the shape of the hair bundles planted on the hair-implanting surface of the head is a flat-line type hair planting. The thickness of the head is 2.0 mm˜4.0 mm. The minimum width of the neck is 3.0 mm to 4.5 mm, and the minimum thickness is 3.0 mm to 4.5 mm. The product of the bending amount A' of the head portion measured by the following method (α') and the bending amount B of the neck portion measured by the following method (β) is 2.5 to 12. The bending amount A' is 1 to 5 mm. The ratio (B/A') of the amount of bending B to the amount of bending A' is 0.8 to 2.5. Method (α'): The hair-implanted surface of the head is directed upward in the vertical direction, and the position is fixed by moving 10 mm from the position of the boundary between the head and the neck toward the shank. The height of the front end of the handle body in the state is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head, 10 from the front end of the hair-implanted part. A weight of 200 g was suspended at a position of ±3%, and the displacement amount (unit: mm) of the height of the front end of the handle body from the reference height after 10 seconds was defined as the bending of the head Quantity A'. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [9] The toothbrush according to [8], wherein the product of the amount of curvature A' of the head portion and the amount of curvature B of the neck portion is 2.5 to 10. [10] The toothbrush according to [8] or [9], wherein a ratio (B/A') of the amount of curvature B to the amount of curvature A' is 0.8 to 2.0. [11] The toothbrush according to [8] or [9], wherein the minimum width of the neck portion is 3.0 mm to 4.2 mm. [12] The toothbrush according to [8] or [9], wherein the bending amount B is 2.1 to 5.0 mm. [13] The toothbrush according to [8] or [9], wherein the product of the curvature amount A of the head portion and the curvature amount B of the neck portion measured by the following method (α) is 2 ~10. Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the handle body in a state where the position of the boundary between the head and the neck is fixed is used as a reference The height, in the fixed state, and further with respect to the length in the long axis direction of the hair-implanted part in the head, hang a weight of 200 g at a position of 10±3% from the front end of the hair-implanted part, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount A of the head portion. [14] The toothbrush according to [13], wherein a ratio (B/A) of the amount of curvature B to the amount of curvature A is 1.5 to 5.0. [15] The toothbrush according to [13], wherein the amount of curvature A is 0.4 to 3.0 mm. [16] The toothbrush according to [8] or [9], wherein the bristle tip strength of the bristles constituting the bristle bundle is 1.7 N to 3.0 N. [17] A toothbrush comprising a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a hair-implanted surface of the head The hair bundles are planted on the top, and the shape of the hair bundles planted on the hair-implanting surface of the head is a flat-line type hair planting. The thickness of the head is 2.0 mm to 4.0 mm, and the minimum width of the neck is 3.0 mm to 4.5 mm. The handle body is made of polypropylene resin. When the amount of curvature of the head measured by the following method (α) is defined as A, and the amount of curvature of the neck measured by the following method (β) is defined as B , the value X of the bending amount (A/L2) of the head with respect to the length (L2) of the head is 0.015 to 0.045. The ratio of the value Y of the amount of curvature of the neck (B/(L2+L3)) to the X with respect to the sum of the length (L2) of the head and the length (L3) of the neck (L2+L3), namely Y/X is 0.8 to 2.0. Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the distal end of the handle body in a state where the position of the boundary between the head and the neck is fixed is used as a reference The height, in the fixed state, and further with respect to the length in the long axis direction of the hair-implanted part in the head, hang a weight of 200 g at a position of 10±3% from the front end of the hair-implanted part, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount A of the head portion. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [18] A toothbrush comprising a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a hair-implanted surface of the head The hair bundles are planted on the top, and the shape of the hair bundles planted on the hair-implanting surface of the head is a flat-line type hair planting. The thickness of the head is 2.0 mm to 4.0 mm, and the minimum width of the neck is 3.0 mm to 4.5 mm. The handle body is made of polyacetal resin. When the amount of curvature of the head measured by the following method (α) is defined as A, and the amount of curvature of the neck measured by the following method (β) is defined as B , the value X of the bending amount (A/L2) of the head with respect to the length (L2) of the head is 0.027 to 0.035. The ratio of the value Y of the amount of curvature of the neck (B/(L2+L3)) to the X with respect to the sum of the length (L2) of the head and the length (L3) of the neck (L2+L3), namely Y/X is 1.0 to 1.4. Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the handle body in a state where the position of the boundary between the head and the neck is fixed is used as a reference The height, in the fixed state, and further with respect to the length in the long axis direction of the hair-implanted part in the head, hang a weight of 200 g at a position of 10±3% from the front end of the hair-implanted part, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount A of the head portion. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [19] The toothbrush according to [17] or [18], wherein the amount of curvature A is 0.4 to 3.0 mm, and the amount of curvature B is 2.1 to 5.0 mm. [20] The toothbrush according to [17] or [18], wherein the minimum thickness of the neck portion is 3.0 mm to 4.5 mm. [21] The toothbrush according to [17] or [18], wherein the minimum width of the neck portion is 3.0 mm to 4.2 mm. [22] The toothbrush according to [20], wherein the minimum thickness of the neck portion is 3.0 mm to 4.2 mm. [23] A toothbrush comprising a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanted surface of the head The top is provided with a plurality of hair bundles by flat-line hair planting. The thickness of the head is 2.0 mm˜4.0 mm. The smaller one of the minimum width and the minimum thickness of the neck is 3.0 mm to 4.5 mm, and between the amount of curvature A of the head measured by the following method (α) and the following In the bending amount B of the neck portion measured by the method (β), the bending amount A is 0.4 to 3.0 mm, and the bending amount B is 2.1 to 5.0 mm. The difference (BB-A) between the bending amount A and the bending amount B is 1 mm≦(BB-A)≦4 mm. The product of the numerical value expressed in mm of the bending amount A and the numerical value expressed in mm of the bending amount B is 0.84 to 10. Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the distal end of the handle body in a state where the position of the boundary between the head and the neck is fixed is used as a reference The height, in the fixed state, and further with respect to the length in the long axis direction of the hair-implanted part in the head, hang a weight of 200 g at a position of 10±3% from the front end of the hair-implanted part, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount A of the head portion. Method (β): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the shank in a state where the position of the boundary between the neck and the shank is fixed as a reference In the fixed state, a weight of 200 g is suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the hair-implanted part in the head in the long-axis direction, Let the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds be the bending amount B of the neck portion. [24] The toothbrush according to [23], wherein the neck portion has a minimum width of 3.0 mm to 4.5 mm, and a minimum thickness of 3.0 mm to 4.5 mm. [25] The toothbrush according to [23] or [24], wherein the product of the numerical value expressed in mm of the amount of curvature A and the numerical value expressed in mm of the amount of curvature B is 2 to 10. [26] The toothbrush according to [23] or [24], wherein the amount of curvature A is 0.5 to 2.0 mm, and the amount of curvature B is 2.1 to 4.0 mm. [27] The toothbrush according to [23] or [24], wherein the bristle tip strength of the bristles constituting the bristle bundle is 1.7 N to 3.0 N. [28] The toothbrush according to [23] or [24], wherein the minimum width of the neck portion is 3.0 mm to 4.2 mm. [29] The toothbrush according to [23] or [24], wherein the handle body is made of polypropylene resin. [Effect of invention]

本發明的牙刷的清掃力更優異、且使用感更優異。The toothbrush of the present invention is more excellent in cleaning power and more excellent in usability.

[第1發明] 以下，參照圖1A及圖1B來說明第1發明的牙刷的實施形態。 圖1A及圖1B的牙刷1包括：於俯視下為大致四邊形的頭部2、延伸設置於該頭部2的頸部4、及延伸設置於該頸部4的柄部6（以下，亦將頭部2與頸部4及柄部6合起來稱為柄體10）。於所述頭部2中設置有植毛部（未圖示）。[First Invention] Hereinafter, an embodiment of the toothbrush of the first invention will be described with reference to FIGS. 1A and 1B . The toothbrush 1 of FIGS. 1A and 1B includes a head 2 that is substantially quadrilateral in plan view, a neck 4 extending from the head 2 , and a handle 6 extending from the neck 4 (hereinafter, also referred to as The head 2, the neck 4 and the handle 6 are collectively referred to as the handle body 10). A hair-implanting portion (not shown) is provided in the head portion 2 .

柄體10是作為整體一體成形為長條狀者，例如為將樹脂作為材料並藉由射出成形所獲得者。 作為柄體的材質，可列舉：聚丙烯樹脂（Polypropylene，PP）、聚縮醛樹脂（聚甲醛（Polyoxymethylene，POM））、聚苯乙烯樹脂（Polystyrene，PS）、聚對苯二甲酸乙二酯樹脂（Polyethylene terephthalate，PET）、聚對苯二甲酸丁二酯樹脂（Polybutylene terephthalate，PBT）、丙烯腈-丁二烯-苯乙烯樹脂（Acrylonitrile Butadiene Styrene，ABS）、聚芳酯樹脂、聚碳酸酯樹脂、丙烯腈-苯乙烯樹脂（Acrylonitrile Styrene，AS）、聚酯樹脂（聚(1,4-伸環己基二亞甲基對苯二甲酸)（Poly(l,4-cyclohexylene dimethylene terephthalic acid)，PCTA））等。該些之中，就強度高、成形性優異的方面等而言，較佳為PP、POM、PBT，更佳為PP、POM。另外，就能夠以更低的成本進一步獲得本發明的效果的方面而言，柄體的材質特佳為PP。 所述樹脂可單獨使用一種，亦可將兩種以上組合使用。 柄體的材質的彎曲彈性係數較佳為1200 MPa～3000 MPa，更佳為1500 MPa～3000 MPa。若柄體的材質的彎曲彈性係數為所述範圍，則可將頭部的彎曲量設定成適當的值，並關係到口腔內的清掃力或操作性的提昇、使用者的使用感的提昇。再者，柄體的材質的彎曲彈性係數是依據日本工業標準（Japanese Industrial Standards，JIS）K7171來測定。 另外，柄體10的柄部6的一部分或全部可由軟質樹脂包覆。藉由柄部6的一部分或全部由軟質樹脂包覆，可進一步提高使用者握住柄部6時的握持性。作為所述軟質樹脂，例如可列舉：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，矽樹脂等。The handle body 10 is integrally formed into a long shape as a whole, and is obtained by injection molding, for example, using resin as a material. Examples of the material of the handle body include: polypropylene resin (Polypropylene, PP), polyacetal resin (polyoxymethylene (POM)), polystyrene resin (Polystyrene, PS), polyethylene terephthalate Resin (Polyethylene terephthalate, PET), polybutylene terephthalate resin (Polybutylene terephthalate, PBT), acrylonitrile-butadiene-styrene resin (Acrylonitrile Butadiene Styrene, ABS), polyarylate resin, polycarbonate resin, acrylonitrile-styrene resin (Acrylonitrile Styrene, AS), polyester resin (poly(1,4-cyclohexylene dimethylene terephthalic acid) (Poly(l,4-cyclohexylene dimethylene terephthalic acid), PCTA)) etc. Among these, PP, POM, and PBT are preferable in terms of high strength and excellent formability, and more preferable are PP and POM. Moreover, since the effect of this invention can be acquired more at lower cost, it is especially preferable that the material of the handle body is PP. The resins may be used alone or in combination of two or more. The bending elastic coefficient of the material of the handle body is preferably 1200 MPa to 3000 MPa, more preferably 1500 MPa to 3000 MPa. When the bending elastic coefficient of the material of the handle body is within the above range, the amount of bending of the head can be set to an appropriate value, which is related to the improvement of the cleaning force in the oral cavity, the operability, and the improvement of the user's usability. In addition, the bending elastic modulus of the material of the handle body was measured based on Japanese Industrial Standards (JIS) K7171. In addition, a part or the whole of the handle part 6 of the handle body 10 may be covered with a soft resin. By covering a part or all of the handle portion 6 with soft resin, the gripping property of the user when holding the handle portion 6 can be further improved. Examples of the soft resin include elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, polyester-based elastomers, and polyurethane-based thermoplastic elastomers, and silicone resins.

柄體10的長度L1可考慮操作性等來決定，例如設為150 mm～200 mm。The length L1 of the handle body 10 can be determined in consideration of operability and the like, and is set to, for example, 150 mm to 200 mm.

頭部2是將柄體10的長度方向作為長邊，於俯視下呈4個頂部由曲線來形成切角的大致四邊形的平板狀。於頭部2的一個面（植毛面20）上形成有多個植毛孔22。於該植毛孔22中植設將牙刷毛捆紮而成的毛束，形成包含多個毛束的植毛部。 再者，於本說明書中，所謂俯視，是指自頭部的植毛面側觀察牙刷。將與植毛面20平行且與柄體10的長度方向正交的方向設為寬度，將與植毛面20正交的方向設為厚度。此外，將面對植毛面20之側設為表面，將面對植毛面20之側的相反側設為背面。 於俯視下，頭部2隨著自前端9朝向頸部4，於寬度方向上擴大，其次以同等的寬度延伸，繼而於寬度方向上縮小，最後到達與頸部4的邊界P1。The head 2 is a substantially quadrangular flat plate shape in which the four tops are chamfered by curved lines in plan view, taking the longitudinal direction of the handle body 10 as a long side. A plurality of planting pores 22 are formed on one surface (hair planting surface 20 ) of the head 2 . A hair bundle in which toothbrush bristles are bundled is implanted in the implantation hole 22, and a hair implantation portion including a plurality of hair bundles is formed. In addition, in this specification, a top view means seeing a toothbrush from the hair-implantation surface side of a head. Let the direction parallel to the hair-implantation surface 20 and perpendicular to the longitudinal direction of the handle body 10 be the width, and the direction perpendicular to the hair-implantation surface 20 be the thickness. Moreover, let the side which faces the hair-implantation surface 20 be a front surface, and let the opposite side of the side which faces the hair-implantation surface 20 be a back surface. In a plan view, the head 2 expands in the width direction from the front end 9 toward the neck 4 , then extends with the same width, then shrinks in the width direction, and finally reaches the boundary P1 with the neck 4 .

於本實施形態中，邊界P1是頭部2的俯視形狀中的形成自頸部4起的切角的曲線的終點，即形成切角的曲線的彎曲方向變化的位置。即，頭部與頸部的邊界P1是自俯視下的頭部中的形成自頸部起的切角部分的寬度變小的兩邊緣的曲線或直線R1變化成寬度擴大的曲線或直線、或者寬度相同的直線的位置。另外，於在俯視下寬度隨著頸部朝向柄部而變大的牙刷的情況下，邊界P1與在俯視下頭部與頸部中的寬度最小的位置一致。 再者，例如存在如頭部與頸部以相同的寬度形成的牙刷般，難以特別規定所述邊界P1的位置的情況。於此情況下，相對於長度L1，將自柄體10的前端9起17.5%的位置（例如，當長度L1為180 mm時，自柄體10的前端9起31.5 mm的位置）設為邊界P1。In the present embodiment, the boundary P1 is the end point of the curve forming the chamfer from the neck 4 in the plan view of the head 2 , that is, the position where the bending direction of the curve forming the chamfer changes. That is, the boundary P1 between the head and the neck is a curve or straight line R1 having a widened width from a curved line or straight line R1 that forms both edges of the head in a plan view that form the chamfered portion from the neck portion where the width becomes smaller, or Position of lines of the same width. Moreover, in the case of the toothbrush whose width increases as the neck goes toward the handle in a plan view, the boundary P1 corresponds to the position where the width between the head and the neck in plan view is the smallest. Furthermore, for example, like a toothbrush in which the head and the neck are formed with the same width, it may be difficult to specify the position of the boundary P1 in particular. In this case, with respect to the length L1, the position of 17.5% from the front end 9 of the handle body 10 (for example, when the length L1 is 180 mm, the position of 31.5 mm from the front end 9 of the handle body 10) is set as the boundary. P1.

頭部2的大小可考慮於口腔內的操作性等來決定。 頭部2的最大寬度W1若過大，則於口腔內的操作性下降，若過小，則進行植毛的毛束的數量變得過少，清掃力容易受損。因此，寬度W1例如設為5 mm～13 mm。 頭部2的厚度T1較佳為2.0 mm～4.0 mm，更佳為2.0 mm～3.5 mm，進而更佳為2.5 mm～3.2 mm。若厚度T1為所述下限值以上，則於頭部2中容易確保充分的強度。進而，容易於厚度方向上形成植毛孔22，容易將毛束牢固地植設於植毛孔22中且容易抑制毛束脫落。另外，若厚度T1為所述上限值以下，則可進一步提高牙刷1於口腔內的操作性。進而，可使牙刷毛到達臼齒的深處等口腔內的各個角落，可進一步提高口腔內的污垢去除效果。 再者，當頭部2的厚度不固定時，T1表示頭部2的最小的厚度。 頭部2的長度L2若過長，則於口腔內的操作性容易受損，若過短，則進行植毛的毛束的數量變得過少，清掃效果容易受損。因此，長度L2例如於10 mm～40 mm的範圍內適宜決定。The size of the head 2 can be determined in consideration of operability in the oral cavity and the like. When the maximum width W1 of the head part 2 is too large, the operability in the oral cavity is lowered, and when it is too small, the number of the hair-implanted hair bundles is too small, and the cleaning power is easily impaired. Therefore, the width W1 is set to, for example, 5 mm to 13 mm. The thickness T1 of the head 2 is preferably 2.0 mm to 4.0 mm, more preferably 2.0 mm to 3.5 mm, and still more preferably 2.5 mm to 3.2 mm. When the thickness T1 is equal to or greater than the lower limit value, it is easy to ensure sufficient strength in the head 2 . Furthermore, it becomes easy to form the tuft hole 22 in the thickness direction, and it becomes easy to plant the hair bundle firmly in the tuft hole 22, and it becomes easy to suppress the fall of a hair bundle. Moreover, if the thickness T1 is below the said upper limit, the operability of the toothbrush 1 in the oral cavity can be further improved. Furthermore, the toothbrush bristles can reach every corner in the oral cavity, such as the depths of the molars, and the dirt removal effect in the oral cavity can be further improved. Furthermore, when the thickness of the head 2 is not constant, T1 represents the minimum thickness of the head 2 . When the length L2 of the head 2 is too long, the operability in the oral cavity is easily impaired, and when it is too short, the number of hair bundles to be implanted becomes too small, and the cleaning effect is easily impaired. Therefore, the length L2 is appropriately determined in the range of, for example, 10 mm to 40 mm.

植毛孔22的形狀並無特別限定，可列舉：正圓或橢圓等圓形、三角形或四邊形等多邊形等。 植毛孔22的數量並無特別限定，例如設為10～60。 植毛孔22的直徑對應於所要求的毛束的粗度來決定，例如設為1 mm～3 mm。 植毛孔22的排列圖案並無特別限定，可為所謂的網格狀或鋸齒狀等任何排列圖案。The shape of the implanted pores 22 is not particularly limited, and examples thereof include a circle such as a perfect circle and an ellipse, and a polygon such as a triangle and a quadrangle. The number of the vegetative pores 22 is not particularly limited, but is set to 10 to 60, for example. The diameter of the tufting hole 22 is determined according to the required thickness of the hair bundle, and is, for example, 1 mm to 3 mm. The arrangement pattern of the implanted pores 22 is not particularly limited, and may be any arrangement pattern such as a so-called grid shape or a zigzag shape.

作為構成毛束的牙刷毛，可列舉：其直徑朝向毛尖逐漸變小的牙刷毛（錐形毛），除毛尖的圓形部分以外外徑大致相同的牙刷毛（直毛），毛尖變成篦狀、球狀、前端分裂狀等形狀的牙刷毛。 作為牙刷毛，較佳為錐形毛。藉由將牙刷毛設為錐形毛，可提高牙周袋等的污垢去除效果。進而，可提高牙齦的按摩效果，且使用感進一步提昇。Examples of toothbrush bristles that constitute the bristle bundle include: toothbrush bristles (conical bristles) whose diameters gradually decrease toward the bristle tip, toothbrush bristles (straight bristles) having substantially the same outer diameter except for the circular portion of the bristle tip, and the bristle tip has a grate-like shape , spherical, front-end split and other shapes of bristles. As toothbrush bristles, tapered bristles are preferred. By making the toothbrush bristles tapered, the effect of removing contaminants such as periodontal pockets can be improved. Furthermore, the massage effect of the gums can be improved, and the feeling of use can be further improved.

作為牙刷毛的材質，例如可列舉：6-12尼龍、6-10尼龍等聚醯胺，PET、PBT、聚對苯二甲酸丙二酯（Polytrimethylene terephthalate，PTT）、聚萘二甲酸乙二酯（Polyethylene naphthalate，PEN）、聚萘二甲酸丁二酯（Polybutylene naphthalate，PBN）等聚酯，聚丙烯等聚烯烴，烯烴系彈性體、苯乙烯系彈性體等合成樹脂材料。該些樹脂材料可單獨使用一種，亦可將兩種以上組合使用。 另外，牙刷毛亦可為具有芯部與設置於該芯部的外側的至少1層以上的鞘部的多重芯結構。Examples of the material of the toothbrush bristles include polyamides such as 6-12 nylon and 6-10 nylon, PET, PBT, polytrimethylene terephthalate (PTT), and polyethylene naphthalate. (Polyethylene naphthalate, PEN), polybutylene naphthalate (Polybutylene naphthalate, PBN) and other polyesters, polypropylene and other polyolefins, olefin elastomers, styrene elastomers and other synthetic resin materials. These resin materials may be used alone or in combination of two or more. Moreover, the multi-core structure which has a core part and the sheath part provided in the outer side of this core part at least 1 layer or more may be sufficient as the toothbrush bristles.

牙刷毛的橫剖面形狀較佳為正圓形，但未必限定於正圓形，可對應於牙刷1的目的用途而設為任意的形狀。例如可設為橢圓形、多邊形（例如三角形、四邊形、五邊形、六邊形等）、異形（例如星形、三葉的三葉草形、四葉的三葉草形等）等。The cross-sectional shape of the toothbrush bristles is preferably a perfect circle, but it is not necessarily limited to a perfect circle, and can be set to any shape according to the intended use of the toothbrush 1 . For example, it can be an ellipse, a polygon (for example, a triangle, a quadrilateral, a pentagon, a hexagon, etc.), a special shape (for example, a star, a three-leaf clover, a four-leaf clover, etc.).

各牙刷毛的粗度並無特別限定，例如於橫剖面為正圓形的情況下，較佳為4 mil～8 mil（1 mil＝1/1000 inch＝0.025 mm）。若為所述下限值以上，則自立性提昇且清掃性進一步變高，若為所述上限值以下，則毛束11的毛硬變得適度，接觸感變得更良好。 構成毛束11的牙刷毛可全部為相同的粗度，亦可將兩種以上的粗度不同的牙刷毛加以組合。The thickness of each toothbrush bristles is not particularly limited, but for example, when the cross section is a perfect circle, it is preferably 4 mil to 8 mil (1 mil=1/1000 inch=0.025 mm). If it is more than the said lower limit, self-supporting property will improve and cleaning property will become further high, and if it is less than the said upper limit, the bristle hardness of the hair bundle 11 will become moderate, and a touch feeling will become more favorable. All the toothbrush bristles constituting the bristle bundle 11 may have the same thickness, or two or more types of toothbrush bristles having different thicknesses may be combined.

牙刷毛的毛長例如大人用的牙刷毛較佳為設為8 mm～15 mm，兒童用的牙刷毛較佳為設為6 mm～12 mm。另外，就口腔內的使用性或使用感的方面而言，較佳為所選擇的牙刷毛的直徑越小，越縮短牙刷毛的毛長。另外，亦可對應於使用感或刷掃感、清掃效果、耐久性等目的，將粗度不同的多根牙刷毛組合使用。The bristle length of the toothbrush is preferably 8 mm to 15 mm for adults, and 6 mm to 12 mm for children. Moreover, it is preferable that the diameter of the selected toothbrush bristles decreases the hair length of the toothbrush bristles from the viewpoint of the usability in the oral cavity and the usability. In addition, it is also possible to use a combination of a plurality of toothbrush bristles having different thicknesses according to the purpose of the feeling of use, the feeling of brushing, the cleaning effect, and the durability.

頸部4是將頭部2與柄部6連接者。 於本實施形態中，頸部4自邊界P1朝向柄部6以大致相同的直徑延伸，繼而進行擴徑，最後到達與柄部6的邊界P2。所述邊界P2是頸部4的擴徑的終點，即，於俯視下，形成加寬的部分的兩邊緣的直線的終點或形成加寬的部分的兩邊緣的曲線的彎曲方向變化的位置。若為圖1A，則頸部與柄部的邊界P2是於俯視下，自頸部中的形成寬度變大的部分的兩邊緣的直線或曲線R2變化成寬度逐漸地變小的曲線的位置。 再者，存在如頸部與柄部以相同的寬度形成的牙刷般，難以特別規定所述邊界P2的位置的情況。於此情況下，相對於長度L1，將自柄體10的前端9起42.2%的位置（例如，當長度L1為180 mm時，自柄體10的前端9起76.0 mm的位置）設為邊界P2。The neck 4 is what connects the head 2 to the handle 6 . In the present embodiment, the neck 4 extends from the boundary P1 toward the shank 6 with substantially the same diameter, then expands in diameter, and finally reaches the boundary P2 with the shank 6 . The boundary P2 is the end point of the diameter expansion of the neck portion 4 , that is, the end point of the straight line forming the both edges of the widened portion or the position where the curved direction of the curved line forming the widened portion changes in plan view. 1A , the boundary P2 between the neck and the shank is a position where the straight line or curve R2 of the two edges forming the widened portion of the neck is changed to a gradually narrowed curve in plan view. Furthermore, like a toothbrush in which the neck portion and the handle portion are formed with the same width, it may be difficult to specify the position of the boundary P2 in particular. In this case, with respect to the length L1, the position of 42.2% from the front end 9 of the handle body 10 (for example, when the length L1 is 180 mm, the position of 76.0 mm from the front end 9 of the handle body 10) is set as the boundary. P2.

頸部4的寬度W2較佳為3.0 mm～4.5 mm，更佳為3.0 mm～4.2 mm。若寬度W2為所述下限值以上，則就耐折等的方面而言，於頸部4中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得由適度的彎曲所產生的良好的使用感。另外，若寬度W2為所述上限值以下，則可提高牙刷1於口腔內的操作性。進而，可使牙刷毛到達口腔內的各個角落，可進一步提高口腔內的污垢去除效果。 再者，當頸部4的寬度不固定時，寬度W2表示頸部4的最小的寬度。The width W2 of the neck portion 4 is preferably 3.0 mm to 4.5 mm, more preferably 3.0 mm to 4.2 mm. When the width W2 is equal to or larger than the lower limit value, it is easy to ensure sufficient strength in the neck portion 4 in terms of folding endurance and the like. Furthermore, the toothbrush 1 does not become too soft, and it becomes easy to obtain a favorable feeling of use by moderate bending. Moreover, the operability of the toothbrush 1 in an oral cavity can be improved as width W2 is below the said upper limit. Furthermore, the toothbrush bristles can reach every corner in the oral cavity, and the dirt removal effect in the oral cavity can be further improved. Furthermore, when the width of the neck portion 4 is not constant, the width W2 represents the minimum width of the neck portion 4 .

頸部4的厚度T2較佳為3.0 mm～4.5 mm，更佳為3.0 mm～4.2 mm。若厚度T2為所述下限值以上，則就耐折等的方面而言，於頸部4中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得由適度的彎曲所產生的良好的使用感。另外，若厚度T2為所述上限值以下，則可提高牙刷1於口腔內的操作性。進而，可使牙刷毛到達口腔內的各個角落，可進一步提高口腔內的污垢去除效果。 再者，當頸部4的厚度不固定時，厚度T2表示頸部4的最小的厚度。The thickness T2 of the neck 4 is preferably 3.0 mm to 4.5 mm, more preferably 3.0 mm to 4.2 mm. When the thickness T2 is equal to or more than the lower limit value, it is easy to ensure sufficient strength in the neck portion 4 in terms of folding endurance and the like. Furthermore, the toothbrush 1 does not become too soft, and it becomes easy to obtain a favorable feeling of use by moderate bending. Moreover, the operability of the toothbrush 1 in an oral cavity can be improved as thickness T2 is below the said upper limit. Furthermore, the toothbrush bristles can reach every corner in the oral cavity, and the dirt removal effect in the oral cavity can be further improved. Furthermore, when the thickness of the neck portion 4 is not constant, the thickness T2 represents the minimum thickness of the neck portion 4 .

頸部4的最小直徑較佳為3.0 mm～4.5 mm，更佳為3.0 mm～4.2 mm。若頸部4的最小直徑為所述下限值以上，則就耐折等的方面而言，於頸部4中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得由適度的彎曲所產生的良好的使用感。另外，若頸部4的最小直徑為所述上限值以下，則可提高牙刷1於口腔內的操作性。進而，可使牙刷毛到達口腔內的各個角落，可進一步提高口腔內的污垢去除效果。 再者，頸部4的最小直徑表示所述寬度W2與厚度T2中的小的一方的值，即頸部4的最小的寬度與最小的厚度中的小的一方。於頸部中，更佳為最小的厚度與最小的寬度相同，或最小的寬度比最小的厚度小、且最小的寬度為3.0 mm～4.5 mm。The minimum diameter of the neck 4 is preferably 3.0 mm to 4.5 mm, more preferably 3.0 mm to 4.2 mm. When the minimum diameter of the neck part 4 is more than the said lower limit, it becomes easy to ensure sufficient intensity|strength in the neck part 4 from a viewpoint of folding resistance etc. Furthermore, the toothbrush 1 does not become too soft, and it becomes easy to obtain a favorable feeling of use by moderate bending. Moreover, when the minimum diameter of the neck part 4 is below the said upper limit, the operability of the toothbrush 1 in an oral cavity can be improved. Furthermore, the toothbrush bristles can reach every corner in the oral cavity, and the dirt removal effect in the oral cavity can be further improved. In addition, the minimum diameter of the neck 4 represents the smaller value of the width W2 and the thickness T2, that is, the smaller of the minimum width and the minimum thickness of the neck 4 . In the neck, it is more preferable that the minimum thickness is the same as the minimum width, or the minimum width is smaller than the minimum thickness, and the minimum width is 3.0 mm to 4.5 mm.

頸部4的長度L3可考慮頭部的長度L2等來決定，例如為達到30 mm～90 mm的長度，更佳為30 mm～60 mm。若長度L3為所述下限值以上，則容易使牙刷毛到達口腔內的各個角落，可進一步提高口腔內的污垢去除效果。若長度L3為所述上限值以下，則可進一步提高牙刷1於口腔內的操作性。The length L3 of the neck 4 can be determined in consideration of the length L2 of the head, etc., and is, for example, a length of 30 mm to 90 mm, more preferably 30 mm to 60 mm. When the length L3 is equal to or more than the lower limit value, the bristles of the toothbrush can easily reach every corner in the oral cavity, and the effect of removing dirt in the oral cavity can be further improved. The operability of the toothbrush 1 in an oral cavity can be further improved as length L3 is below the said upper limit.

（頭部2的彎曲量A） 頭部的彎曲量A藉由以下的方法（α）來測定。 方法（α）： 使頭部的植毛面朝向鉛垂方向的上方，以將牙刷的頭部與頸部的邊界P1的位置固定的狀態下的柄體的前端的高度為基準高度。進而，於將所述邊界P1的位置固定的狀態下，相對於頭部中的植毛部的長軸方向的長度，於自植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的柄體的前端的自基準高度起的高度的位移量（單位為mm）設為頭部的彎曲量A。 再者，所謂「植毛部的長軸方向的長度」，是指俯視頭部時的位於最前端側的植毛孔的前端與位於最後端側的植毛孔的後端的距離。 例如，當於俯視下頸部的自頭部起的部分的寬度相同時，於所述頸部的自頭部起的部分中，一面朝向頭部緩慢地改變位置一面測定寬度，並將寬度相同的部分與寬度開始變大的部分的轉折點的位置設為邊界P1。另外，當於俯視下頸部的自頭部起的部分的寬度隨著接近頭部而變小時，於頸部的自頭部起的部分中，一面朝向頭部緩慢地改變位置一面測定寬度，並將寬度變成最小的位置設為邊界P1。(Bending amount A of head 2) The amount of curvature A of the head is measured by the following method (α). Method (α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the tip of the handle body in a state where the position of the boundary P1 between the head and the neck of the toothbrush is fixed is used as a reference height. Furthermore, in a state where the position of the boundary P1 was fixed, a weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implantation part with respect to the length of the hair-implantation part in the head in the long-axis direction. , and the displacement amount (unit is mm) of the height of the front end of the handle body from the reference height after 10 seconds is defined as the bending amount A of the head. In addition, the "length in the long axis direction of the hair-implantation part" refers to the distance between the front end of the tufting hole located on the most distal side and the rear end of the tufting hole located on the rearmost side in a plan view of the head. For example, when the width of the portion of the neck from the head in plan view is the same, the width of the portion of the neck from the head is measured while the position is gradually changed toward the head, and the width is the same. The position of the turning point between the portion where the width begins to increase and the portion where the width begins to increase is set as the boundary P1. In addition, when the width of the portion of the neck from the head becomes smaller as it approaches the head in a plan view, the width of the portion of the neck from the head is measured while gradually changing the position toward the head. The position where the width becomes the smallest is set as the boundary P1.

於本發明中，頭部2的彎曲量A如以下般進行測定。 如圖2A所示，使牙刷1變成植毛面20朝上並於頸部最細部的位置（邊界P1）上使用夾具100進行固定。此時，將柄體10的前端9的高度設為基準高度H0 。 繼而，如圖2B所示，將200 g的秤錘102懸掛於S的位置上，測定10秒後的柄體10的前端9的高度，並將其高度設為H1 。所述S是相對於植毛部長軸方向，自植毛部前端起10±3%的位置。例如當植毛部為19 mm時，S為自該前端起2.0 mm的位置。 繼而，將H1 與H0 的差的絕對值作為a（單位為mm）來求出。所述a例如藉由高度規（height gauge）等來測定。測定是於室溫25±3℃下進行。 進行5次所述測定，並將所述a的平均值設為頭部2的彎曲量A。In the present invention, the amount of curvature A of the head 2 is measured as follows. As shown in FIG. 2A , the toothbrush 1 is fixed with the jig 100 at the position (boundary P1 ) of the thinnest part of the neck so that the bristle-implanting surface 20 faces upward. At this time, let the height of the front end 9 of the handle body 10 be the reference height H 0 . Next, as shown in FIG. 2B , the weight 102 of 200 g was suspended at the position S, the height of the front end 9 of the handle body 10 after 10 seconds was measured, and the height was set to H 1 . Said S is a position of 10±3% from the front end of the hair-implantation part with respect to the direction of the hair-implantation long axis. For example, when the flocked portion is 19 mm, S is a position 2.0 mm from the tip. Next, the absolute value of the difference between H 1 and H 0 is determined as a (unit: mm). The a is measured by, for example, a height gauge or the like. Measurements were performed at room temperature 25±3°C. The measurement was performed five times, and the average value of the a was defined as the amount of curvature A of the head 2 .

彎曲量A較佳為0.4～3.0，更佳為0.4～2.5，進而更佳為0.4～2.0。另外，彎曲量A較佳為0.5～3.0，更佳為0.5～2.5，進而更佳為0.5～2.0。若彎曲量A為所述範圍，則頭部2本身適度地彎曲，植設於頭部2中的植毛部的柔韌性顯現且對於牙齦的接觸感，即使用感變得更良好。另外，若彎曲量A為所述下限值以上，則使用感變得良好。若彎曲量A為所述上限值以下，則於頭部2中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得良好的口腔內操作性、清掃力。 再者，彎曲量A是藉由調整頭部2的材質（即柄體10的材質）的彎曲彈性係數或頭部2的厚度、寬度等來調整。The bending amount A is preferably 0.4 to 3.0, more preferably 0.4 to 2.5, and still more preferably 0.4 to 2.0. In addition, the bending amount A is preferably 0.5 to 3.0, more preferably 0.5 to 2.5, and still more preferably 0.5 to 2.0. When the bending amount A is in the above-mentioned range, the head 2 itself is moderately bent, the flexibility of the hair-implanted portion implanted in the head 2 is exhibited, and the feeling of contact with the gum, that is, the feeling of use becomes better. In addition, when the bending amount A is equal to or more than the lower limit value, the usability becomes good. When the bending amount A is equal to or less than the upper limit value, it is easy to ensure sufficient strength in the head portion 2 . Furthermore, the toothbrush 1 does not become too soft, and it becomes easy to obtain favorable intraoral operability and cleaning power. Furthermore, the bending amount A is adjusted by adjusting the bending elastic coefficient of the material of the head 2 (ie, the material of the handle body 10 ) or the thickness and width of the head 2 .

（頸部4的彎曲量B） 頸部的彎曲量B藉由以下的方法（β）來測定。 方法（β）： 使頭部的植毛面朝向鉛垂方向的上方，以將牙刷的頸部與柄部的邊界的位置固定的狀態下的柄體的前端的高度為基準高度。於所述固定狀態下，進而相對於頭部中的植毛部的長軸方向的長度，於自植毛部的前端起50±3%的位置上懸掛200 g的秤錘，並將10秒後的柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為頸部的彎曲量B。(Bending amount B of neck 4) The bending amount B of the neck is measured by the following method (β). Method (β): The bristle-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the handle body in a state where the position of the boundary between the neck of the toothbrush and the handle is fixed is used as a reference height. In the above-mentioned fixed state, a weight of 200 g was suspended at a position of 50±3% from the front end of the hair-implanted part with respect to the length of the long-axis direction of the hair-implanted part in the head, and 10 seconds later The displacement amount (unit is mm) of the height of the front end of the handle body from the reference height is defined as the bending amount B of the neck.

於本發明中，除利用夾具100固定牙刷1的位置（邊界P1）、及懸掛秤錘102的位置S與頭部2的彎曲量A的測定方法不同以外，與頭部2的彎曲量A同樣地測定頸部4的彎曲量B。 於頸部4的彎曲量B的測定中，利用夾具100固定牙刷1的位置為邊界P2。另外，S是相對於植毛部的長軸方向的長度，自植毛部前端起50±3%的位置。例如當植毛部為19 mm時，S為自前端起9.5 mm的位置。 而且，與頭部2的彎曲量A的測定方法同樣地求出懸掛秤錘102前的基準高度H0 與懸掛秤錘102並經過10秒後的高度H1 的差的絕對值（單位為mm）。測定是於室溫25±3℃下進行。進行5次該測定，並將其平均值設為頸部4的彎曲量B。In the present invention, it is the same as the bending amount A of the head 2 except that the position (boundary P1 ) where the toothbrush 1 is fixed by the jig 100 and the position S at which the weight 102 is suspended are different from the measurement method of the bending amount A of the head 2 The bending amount B of the neck 4 is measured. In the measurement of the bending amount B of the neck portion 4, the position where the toothbrush 1 is fixed by the jig 100 is the boundary P2. In addition, S is the position of 50±3% from the front end of the hair-implantation part with respect to the length of the long-axis direction of the hair-implantation part. For example, when the flocking portion is 19 mm, S is a position of 9.5 mm from the tip. Then, the absolute value of the difference between the reference height H 0 before the weight 102 is suspended and the height H 1 after the weight 102 is suspended and 10 seconds have elapsed is obtained in the same manner as in the method of measuring the amount of curvature A of the head 2 (unit is mm). ). Measurements were performed at room temperature 25±3°C. This measurement is performed 5 times, and the average value thereof is taken as the bending amount B of the neck portion 4 .

彎曲量B較佳為2.1～5.0，更佳為2.3～4.5，進而更佳為2.5～4.0。若彎曲量B為所述範圍，則頸部4適度地彎曲，適度的緩衝性顯現，植毛部對於牙齦的接觸感變得更良好。另外，若彎曲量B為所述下限值以上，則可使牙刷毛到達臼齒的深處等口腔內的各個角落，可進一步提高口腔內的清掃力。進而，牙刷毛朝牙周袋中的進入性提昇，可進一步提高牙周袋的清掃力。若彎曲量B為所述上限值以下，則於頸部4中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得良好的使用感。 再者，彎曲量B是藉由調整頸部4的材質（即柄體10的材質）的彎曲彈性係數或頸部的最小直徑、邊界P2的剖面形狀等來調整。The bending amount B is preferably 2.1 to 5.0, more preferably 2.3 to 4.5, and still more preferably 2.5 to 4.0. When the bending amount B is in the above-mentioned range, the neck 4 is moderately bent, moderate cushioning properties are exhibited, and the touch feeling of the hair-implanted portion with respect to the gum becomes more favorable. Moreover, when the bending amount B is more than the said lower limit, the toothbrush bristles can be made to reach every corner in an oral cavity, such as the depth of a molar, and the cleaning force in an oral cavity can be improved further. Furthermore, the penetration of the toothbrush bristles into the periodontal pocket is improved, and the cleaning power of the periodontal pocket can be further improved. When the bending amount B is equal to or less than the above-mentioned upper limit value, it is easy to ensure sufficient strength in the neck portion 4 . Furthermore, the toothbrush 1 does not become too soft, and it is easy to obtain a good feeling in use. In addition, the bending amount B is adjusted by adjusting the bending elasticity coefficient of the material of the neck 4 (ie, the material of the handle body 10 ), the minimum diameter of the neck, the cross-sectional shape of the boundary P2 , and the like.

頭部的彎曲量A與頸部的彎曲量B的積（A×B）為0.8～10，更佳為1～10，進而佳為1～6，進而更佳為1～3.5。另外，（A×B）較佳為2～10。若（A×B）為所述範圍，則可獲得頭部2與頸部4協調的適度的彎曲。藉此，當使植毛部相對於清掃對象部位（牙齒、牙齦等）滑動時，植毛部的柔韌性與緩衝性顯現，植毛部的接觸感變得良好。另外，（A×B）的下限值為0.8以上，較佳為1以上。另外，較佳為2以上。藉由（A×B）為所述下限值以上，可獲得適度的彎曲，藉此對於牙齦的接觸感良好，且對於牙齦可獲得高按摩效果，使用感提昇。（A×B）的上限值為10以下，較佳為6以下，更佳為3.5以下。藉由（A×B）為所述上限值以下，可抑制由頭部2與頸部4所形成的區域過度彎曲，而導致操作性下降且清掃力下降的情況。另外，可抑制由所述過度彎曲所引起的對於牙齦的按摩效果下降、或使用者使用牙刷1時感覺到鬆軟的情況。進而，可提高牙刷1的強度且耐久性提昇。The product (A×B) of the amount of curvature A of the head and the amount of curvature B of the neck is 0.8 to 10, more preferably 1 to 10, still more preferably 1 to 6, still more preferably 1 to 3.5. In addition, (A×B) is preferably 2 to 10. As long as (A×B) is in the above-mentioned range, an appropriate curvature of the head 2 and the neck 4 can be obtained. Thereby, when the hair-implantation part is slid with respect to the cleaning target site (teeth, gum, etc.), the flexibility and cushioning properties of the hair-implantation part are exhibited, and the touch feeling of the hair-implantation part becomes good. In addition, the lower limit of (A×B) is 0.8 or more, preferably 1 or more. Moreover, 2 or more are preferable. When (A×B) is equal to or more than the lower limit value, a moderate curvature can be obtained, the feeling of contact with the gums is good, a high massage effect can be obtained with respect to the gums, and the feeling of use is improved. The upper limit of (A×B) is 10 or less, preferably 6 or less, and more preferably 3.5 or less. When (A×B) is equal to or less than the upper limit, the region formed by the head portion 2 and the neck portion 4 can be prevented from being excessively curved, resulting in lowering of operability and lowering of cleaning power. In addition, it is possible to suppress the reduction of the massage effect on the gums due to the excessive bending, or the feeling that the user feels loose when using the toothbrush 1 . Furthermore, the strength of the toothbrush 1 can be improved, and the durability can be improved.

彎曲量A與彎曲量B較佳為A＜B。若為A＜B，則可進一步提高牙刷1的操作性。 另外，彎曲量A與彎曲量B的差（B－A）較佳為1以上，更佳為1.5以上，進而更佳為2以上。若（B－A）為所述下限值以上，則相對於頭部2，將頸部4的彎曲量保持得大，可提高緩衝性且對於牙齦的接觸感變得良好，使用者容易確實感覺到對於牙齦的按摩效果。 另外，（B－A）較佳為4以下，更佳為3以下。若（B－A）為所述上限值以下，則相對於頭部2，頸部4的彎曲量不會變得過大，容易提高於口腔內的操作性。進而，容易抑制使用者使用牙刷1時感覺到鬆軟的情況。 （B－A）較佳為1～4，更佳為1～3。 另外，彎曲量B與彎曲量A的比（B/A）較佳為1.5～5.0，更佳為1.8～4.8。The bending amount A and the bending amount B are preferably A<B. When A<B is satisfied, the operability of the toothbrush 1 can be further improved. In addition, the difference (BB) between the bending amount A and the bending amount B is preferably 1 or more, more preferably 1.5 or more, and still more preferably 2 or more. When (BB) is equal to or more than the lower limit value, the amount of curvature of the neck 4 is kept large with respect to the head 2 , the cushioning properties can be improved, the feeling of contact with the gums becomes good, and the user can be easily assured Feel the massage effect on the gums. Moreover, (BB) becomes like this. Preferably it is 4 or less, More preferably, it is 3 or less. If (BB) is below the said upper limit, the bending amount of the neck part 4 will not become too large with respect to the head part 2, and it becomes easy to improve the operability in an oral cavity. Furthermore, when a user uses the toothbrush 1, it becomes easy to suppress that it feels loose. (B-A) is preferably 1-4, more preferably 1-3. In addition, the ratio (B/A) of the bending amount B to the bending amount A is preferably 1.5 to 5.0, and more preferably 1.8 to 4.8.

（頭部2的彎曲量A'） 頭部的彎曲量A'藉由以下的方法（α'）來測定。 方法（α'）： 使頭部的植毛面朝向鉛垂方向的上方，以將自牙刷中的頭部與頸部的邊界的位置朝柄部側移動10 mm的位置固定的狀態下的柄體的前端的高度為基準高度。於所述固定狀態下，進而相對於頭部中的植毛部的長軸方向的長度，於自植毛部的前端起10±3%的位置上懸掛200 g的秤錘，並將10秒後的柄體的前端的自所述基準高度起的高度的位移量（單位為mm）設為所述頭部的彎曲量A'。(Bending amount A' of head 2) The amount of curvature A' of the head is measured by the following method (α'). Method (α'): With the hair-implanted surface of the head facing upward in the vertical direction, the height of the tip of the handle body in a state where the position is fixed by moving 10 mm from the boundary between the head and the neck in the toothbrush toward the handle side is the reference. high. In the above-mentioned fixed state, a weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implanted part with respect to the length of the long-axis direction of the hair-implanted part in the head, and 10 seconds later The displacement amount (unit is mm) of the height from the said reference|standard height of the front-end|tip of a handle|steering body is made into the bending amount A' of the said head part.

於本發明中，除利用夾具100固定牙刷1的位置（邊界P1）與頭部2的彎曲量A的測定方法不同以外，與頭部2的彎曲量A同樣地測定頭部2的彎曲量A'。 於頭部2的彎曲量A'的測定中，利用夾具100固定牙刷1的位置為於長軸方向上自邊界P1的位置朝柄部側移動10 mm的位置P3。 而且，與頭部2的彎曲量A的測定方法同樣地測定懸掛秤錘102前的基準高度H0 與懸掛秤錘102並經過10秒後的高度H1 的差的絕對值（單位為mm）。測定是於室溫25±3℃下進行。進行5次該測定，並將其平均值設為頭部2的彎曲量A'。In the present invention, the bending amount A of the head portion 2 is measured in the same manner as the bending amount A of the head portion 2 except that the position (boundary P1 ) where the toothbrush 1 is fixed by the jig 100 is different from the measurement method of the bending amount A of the head portion 2 . '. In the measurement of the bending amount A' of the head 2, the position where the toothbrush 1 is fixed by the jig 100 is the position P3 moved 10 mm toward the handle side from the position of the boundary P1 in the long axis direction. Then, the absolute value (unit is mm) of the difference between the reference height H 0 before the weight 102 is suspended and the height H 1 after 10 seconds have elapsed after the weight 102 is suspended is measured in the same manner as the method of measuring the amount of curvature A of the head 2 . Measurements were performed at room temperature 25±3°C. This measurement was performed 5 times, and the average value was set as the amount of curvature A' of the head 2 .

彎曲量A'較佳為1～5，更佳為1～4，進而更佳為1～3。若彎曲量A'為所述範圍，則頭部2本身適度地彎曲，植設於頭部2中的植毛部的柔韌性顯現且對於牙齦的接觸感，即使用感變得更良好。另外，若彎曲量A'為所述下限值以上，則使用感變得良好。若彎曲量A'為所述上限值以下，則於頭部2中容易確保充分的強度。進而，牙刷1不會變得過於鬆軟，容易獲得良好的口腔內操作性、清掃力。 再者，彎曲量A'是藉由調整頭部2的材質（即柄體10的材質）的彎曲彈性係數或頭部2的厚度、寬度等來調整。The bending amount A' is preferably 1-5, more preferably 1-4, and still more preferably 1-3. When the bending amount A' is in the above-mentioned range, the head 2 itself is moderately bent, the flexibility of the hair-implanted portion implanted in the head 2 is exhibited, and the feeling of contact with the gum, that is, the feeling of use becomes better. In addition, when the bending amount A' is equal to or more than the lower limit value, the usability becomes good. When the bending amount A' is equal to or less than the upper limit value, it is easy to ensure sufficient strength in the head 2 . Furthermore, the toothbrush 1 does not become too soft, and it becomes easy to obtain favorable intraoral operability and cleaning power. Furthermore, the bending amount A' is adjusted by adjusting the bending elastic coefficient of the material of the head 2 (ie, the material of the handle body 10 ), the thickness and width of the head 2 , and the like.

頭部的彎曲量A'與頸部的彎曲量B的積（A'×B）較佳為2.5～12，更佳為3～12，進而佳為3～10，進而更佳為3～7。若（A'×B）為所述範圍，則容易獲得頭部2與頸部4協調的適度的彎曲。藉此，當使植毛部相對於清掃對象部位（牙齒、牙齦等）滑動時，植毛部的柔韌性與緩衝性顯現，植毛部的接觸感變得更良好。另外，（A'×B）為2.5以上，較佳為3以上。藉由（A'×B）為所述下限值以上，可獲得適度的彎曲，藉此對於牙齦的接觸感更良好，且對於牙齦可獲得更高的按摩效果，使用感進一步提昇。（A'×B）為12以下，較佳為10以下，更佳為7以下。藉由（A'×B）為所述上限值以下，容易抑制由頭部2與頸部4所形成的區域過度彎曲，而導致操作性下降且清掃力下降的情況。另外，可抑制由所述過度彎曲所引起的對於牙齦的按摩效果下降、或使用者使用牙刷1時感覺到鬆軟的情況。進而，可提高牙刷1的強度且耐久性進一步提昇。The product (A'×B) of the bending amount A' of the head and the bending amount B of the neck is preferably 2.5 to 12, more preferably 3 to 12, still more preferably 3 to 10, still more preferably 3 to 7 . When (A'×B) is in the above-mentioned range, it is easy to obtain an appropriate curvature of the head 2 and the neck 4 in harmony. Thereby, when the hair-implanted part is slid with respect to the cleaning target site (teeth, gums, etc.), the flexibility and cushioning properties of the hair-implanted part are exhibited, and the touch of the hair-implanted part becomes better. In addition, (A'×B) is 2.5 or more, preferably 3 or more. When (A'×B) is equal to or more than the lower limit value, a moderate curvature can be obtained, thereby a better contact feeling with respect to the gum can be obtained, a higher massage effect can be obtained with respect to the gum, and the feeling of use can be further improved. (A'×B) is 12 or less, preferably 10 or less, more preferably 7 or less. When (A'×B) is equal to or less than the upper limit, the region formed by the head portion 2 and the neck portion 4 is easily restrained from being excessively curved, resulting in lowering of operability and lowering of cleaning power. In addition, it is possible to suppress the reduction of the massage effect on the gums due to the excessive bending, or the feeling that the user feels loose when using the toothbrush 1 . Furthermore, the strength of the toothbrush 1 can be improved, and the durability can be further improved.

另外，彎曲量B與彎曲量A'的比（B/A'）較佳為0.8～2.5，更佳為0.9～2.0。In addition, the ratio (B/A') of the bending amount B to the bending amount A' is preferably 0.8 to 2.5, more preferably 0.9 to 2.0.

（牙刷毛的毛尖強度） 構成毛束的牙刷毛的毛尖強度如以下般進行測定。 作為測定裝置，使用ISO毛硬強度試驗機。圖3中所示的ISO毛硬強度試驗機200具備基準面202與配置於基準面上的梯狀物（ladder）204。所述梯狀物204具備多根圓柱狀的棒狀體（不鏽鋼製，直徑：3 mm）。所述棒狀體相互平行地以固定間隔（棒狀體的中心彼此為10 mm間隔）進行排列。 首先，將牙刷1設置於所述試驗機200上。此時，使植設於牙刷1的頭部2中的牙刷毛的前端接觸所述試驗機200的基準面202。而且，求出使頭部2相對於所述基準面202水平地滑動時的最大阻力值，並將其設為牙刷毛的毛尖強度。頭部2的滑動方向是牙刷1的長邊方向與所述棒狀體的長邊方向變得相互垂直的方向。將頭部2的滑動速度設為10 mm/min。(tip strength of toothbrush bristles) The bristle tip strength of the toothbrush bristle which comprises a bristle bundle is measured as follows. As a measuring apparatus, an ISO burr hardness tester was used. The ISO burr hardness tester 200 shown in FIG. 3 includes a reference surface 202 and a ladder 204 arranged on the reference surface. The ladder 204 includes a plurality of cylindrical rod-shaped bodies (made of stainless steel, diameter: 3 mm). The rod-shaped bodies were arranged in parallel with each other at regular intervals (the centers of the rod-shaped bodies were 10 mm apart from each other). First, the toothbrush 1 was installed on the test machine 200 . At this time, the tip of the toothbrush bristles implanted in the head 2 of the toothbrush 1 is brought into contact with the reference surface 202 of the testing machine 200 . Then, the maximum resistance value when the head 2 is horizontally slid with respect to the reference surface 202 is obtained, and this value is used as the bristle tip strength of the toothbrush bristles. The sliding direction of the head 2 is a direction in which the longitudinal direction of the toothbrush 1 and the longitudinal direction of the rod-shaped body become perpendicular to each other. The sliding speed of the head 2 was set to 10 mm/min.

牙刷毛的毛尖強度較佳為1.7 N～3.0 N，更佳為1.9 N～2.8 N。若牙刷毛的毛尖強度為所述較佳的範圍，則可進一步提高齒斑的去除力，且牙刷毛對於牙齦的接觸感變得更良好，可進一步提高使用性。The bristle strength of the toothbrush bristles is preferably 1.7 N to 3.0 N, more preferably 1.9 N to 2.8 N. When the bristle tip strength of the toothbrush bristles is in the above-described preferred range, the plaque removal power can be further improved, the contact feeling of the toothbrush bristles with the gums becomes more favorable, and the usability can be further improved.

本實施形態的牙刷1是依據先前公知的牙刷的製造方法來製造。例如，將硬質樹脂射出至模具中，而使柄體10成形。繼而，於所獲得的柄體10的植毛面20上植設毛束，藉此可獲得牙刷1。作為植設毛束的方法，例如可列舉：將毛束對折並將夾在中間的平線打入植毛孔22中，藉此植設毛束的平線式植毛；朝成為植毛部的熔融樹脂中壓入毛束的下端並加以固定的熱熔接法；對毛束的下端進行加熱而形成熔融塊後，將熔融樹脂注入至模具中來使植毛部成形的模內（in-mold）法等。 第1發明的牙刷於設為藉由平線式植毛來對毛束進行植毛的牙刷時特別有效果。當採用平線式植毛時，由平線打入所產生的負荷施加至頭部。因此，頭部變得越薄，對於施加力時的變形的強度變得越低。於本實施形態的牙刷1中，藉由使頸部具有適度的彎曲性，於刷牙時等可將施加至頭部的力自頭部分散至整個頸部。因此，於平線式植毛的情況下，可特別顯著地獲得本發明的效果。 尤其於利用將強度低的聚丙烯樹脂用作柄體的材質的平線式植毛的牙刷的情況下，當將相對於頭部的長度（L2）的頭部的彎曲量（A/L2）的值X設為0.015～0.045時，較佳為將相對於頭部與頸部的長度的和（L2＋L3）的頸部的彎曲量（B/（L2＋L3））的值Y與所述X的比，即Y/X設為0.8～2.0。所述X較佳為設為0.018～0.45，更佳為設為0.018～0.040，此時，較佳為將Y/X設為0.9～2.0，更佳為設為0.9～1.9。 另外，於利用將強度高的聚縮醛樹脂用作柄體材質的平線式植毛的牙刷的情況下，當將所述X設為0.027～0.035，較佳為設為0.029～0.032時，較佳為將所述Y/X設為1.0～1.4，更佳為設為1.0～1.3。The toothbrush 1 of this embodiment is manufactured according to the manufacturing method of a conventionally known toothbrush. For example, the handle body 10 is formed by injecting a hard resin into a mold. Then, the toothbrush 1 can be obtained by planting a tuft of hairs on the bristle-implanting surface 20 of the obtained handle body 10 . As a method of planting the hair bundle, for example, the flat-line type hair planting in which the hair bundle is planted by folding the hair bundle in half and driving a flat line sandwiched therebetween into the planting pores 22; The heat welding method of pressing and fixing the lower end of the hair bundle, and the in-mold method of forming the hair implanted portion by injecting molten resin into a mold after heating the lower end of the hair bundle to form a molten mass, etc. The toothbrush of 1st invention is especially effective when it is set as the toothbrush which transplanted the hair to the hair bundle by the flat-line hair transplant. When the flat-line type hair transplant is used, the load generated by the flat-line driving is applied to the head. Therefore, the thinner the head becomes, the lower the strength against deformation when force is applied. In the toothbrush 1 of this embodiment, the force applied to the head can be dispersed from the head to the entire neck during brushing or the like by giving the neck an appropriate bendability. Therefore, in the case of the flat-line type hair planting, the effect of the present invention can be obtained particularly remarkably. Especially in the case of using a flat-line bristle-implanted toothbrush using a low-strength polypropylene resin as the material of the handle body, when the value of the amount of curvature (A/L2) of the head with respect to the length (L2) of the head is used When X is set to 0.015 to 0.045, it is preferable to be the ratio of the value Y of the bending amount (B/(L2+L3)) of the neck with respect to the sum of the lengths of the head and the neck (L2+L3) and the above-mentioned X, that is, Y/X is set to 0.8 to 2.0. The X is preferably set to 0.018 to 0.45, more preferably 0.018 to 0.040, and in this case, Y/X is preferably set to 0.9 to 2.0, more preferably 0.9 to 1.9. In addition, in the case of using a toothbrush of a flat-line bristles using a high-strength polyacetal resin as a handle material, it is preferable that the X is set to 0.027 to 0.035, preferably 0.029 to 0.032 In order to make said Y/X into 1.0-1.4, it is more preferable to make it into 1.0-1.3.

對本實施形態的牙刷1的使用方法進行說明。 首先，握持柄部6。握持柄部6的形態並無特別限定，可為掌握（palm grip）式，亦可為筆握（pen grip）式。通常，一面向對象部位施加壓力一面進行清掃，因此於任一種握持形態中，均將拇指等放在頸部後端的邊界P2附近來握持柄部6。 繼而，將頭部2插入口腔內，一面按壓柄部6，一面使植毛部於清掃對象部位上滑動。施加至柄部6上的力經由頸部4而傳遞至頭部2，進而自頭部2傳遞至植毛部，藉此植毛部一面向清掃對象部位施加壓力一面進行清掃。此時，因頭部的彎曲量A與頸部的彎曲量B的積（A×B）為0.8～10，故可獲得頭部與頸部協調的適度的彎曲。其結果，容易使植設於牙刷1的頭部2中的牙刷毛到達臼齒的深處等口腔內的各個角落，可提高口腔內的清掃力。進而，容易使牙刷毛進入至牙周袋中，可提高牙周袋的清掃力。此外，藉由獲得適度的彎曲，植毛部的柔韌性與緩衝性提昇，植毛部對於牙齦的接觸感變得良好，可獲得對於牙齦的良好的按摩效果，並可提高使用感。 另外，若頭部的彎曲量A'與頸部的彎曲量B的積（A'×B）為2.5～12，則更容易獲得頭部與頸部協調的適度的彎曲。藉此，可進一步提高口腔內的臼齒的深處或牙周袋等的清掃力，另外，容易獲得對於牙齦的良好的按摩效果，可進一步提高使用感。The usage method of the toothbrush 1 of this embodiment is demonstrated. First, the handle portion 6 is gripped. The form of the grip portion 6 is not particularly limited, and may be a palm grip type or a pen grip type. Usually, cleaning is performed while applying pressure to the target site, so in any of the gripping forms, the handle 6 is gripped by placing the thumb or the like in the vicinity of the boundary P2 at the rear end of the neck. Next, the head portion 2 is inserted into the oral cavity, and the hair-implantation portion is slid on the cleaning target site while pressing the handle portion 6 . The force applied to the handle portion 6 is transmitted to the head portion 2 via the neck portion 4, and is further transmitted from the head portion 2 to the hair-implantation portion, whereby the hair-implantation portion performs cleaning while applying pressure to the cleaning target site. At this time, since the product (A×B) of the bending amount A of the head and the bending amount B of the neck is 0.8 to 10, an appropriate bending in harmony with the head and the neck can be obtained. As a result, the toothbrush bristles implanted in the head 2 of the toothbrush 1 can easily reach every corner of the oral cavity such as the depths of the molars, and the cleaning power in the oral cavity can be improved. Furthermore, the toothbrush bristles can be easily entered into the periodontal pocket, and the cleaning power of the periodontal pocket can be improved. In addition, by obtaining a moderate curvature, the flexibility and cushioning properties of the hair-implanted part are improved, the touch of the hair-implanted part to the gums becomes good, a good massage effect on the gums can be obtained, and the feeling of use can be improved. In addition, when the product (A'×B) of the bending amount A' of the head and the bending amount B of the neck is 2.5 to 12, it is easier to obtain an appropriate bending in harmony with the head and the neck. Thereby, the cleaning power of the depths of the molars in the oral cavity, periodontal pockets, etc. can be further improved, and a good massage effect on the gums can be easily obtained, and the feeling of use can be further improved.

另外，若頭部2的厚度T1為2.0 mm～4.0 mm、且頸部4的最小直徑為3.0 mm～4.5 mm，則更容易使植設於頭部2中的牙刷毛到達臼齒的深處等口腔內的各個角落，可進一步提高口腔內的清掃力。進而，可進一步提高牙刷1的操作性。 進而，若毛尖強度為1.7 N～3.0 N，則更容易使牙刷毛進入至牙周袋中，可進一步提高牙周袋的清掃力。進而，對於牙齦的接觸感變得更良好，可進一步提高使用感。In addition, when the thickness T1 of the head portion 2 is 2.0 mm to 4.0 mm, and the minimum diameter of the neck portion 4 is 3.0 mm to 4.5 mm, it is easier for the toothbrush bristles implanted in the head portion 2 to reach the depths of the molars, etc. Every corner of the oral cavity can further improve the cleaning power in the oral cavity. Furthermore, the operability of the toothbrush 1 can be further improved. Furthermore, when the bristle tip strength is 1.7 N to 3.0 N, the toothbrush bristles can be more easily entered into the periodontal pocket, and the cleaning power of the periodontal pocket can be further improved. Furthermore, the touch feeling with respect to the gum becomes more favorable, and the usability can be further improved.

[第2發明] 第2發明的牙刷的特徵在於：包括植設有毛束的頭部、延伸設置於頭部的頸部、及延伸設置於頸部的柄部，且頭部的彎曲量A'與頸部的彎曲量B的積（A'×B）為2.5～12。第2發明的牙刷除需要頭部的彎曲量A'與頸部的彎曲量B的積（A'×B）為2.5～12以外，可採用與第1發明的牙刷相同的形態，較佳的形態亦相同。 關於A'×B，如第1發明中所說明般。[Second Invention] The toothbrush of the 2nd invention is characterized in that it includes a head on which tufts of bristles are implanted, a neck extending from the head, and a handle extending from the neck, and the amount of curvature A' of the head is equal to the amount of curvature of the neck. The product (A'×B) of the bending amount B is 2.5 to 12. The toothbrush of the 2nd invention can take the same form as the toothbrush of the 1st invention except that the product (A'×B) of the amount of curvature A' of the head and the amount of curvature B of the neck is 2.5 to 12, and it is preferable The form is also the same. About A'×B, it is as demonstrated in 1st invention.

於第2發明的牙刷中，因頭部的彎曲量A'與頸部的彎曲量B的積（A'×B）為2.5～12，故可獲得頭部與頸部協調的適度的彎曲。其結果，容易使植設於牙刷的頭部中的牙刷毛到達臼齒的深處等口腔內的各個角落，可提高口腔內的清掃力。進而，容易使牙刷毛進入至牙周袋中，可提高牙周袋的清掃力。此外，藉由獲得適度的彎曲，植毛部的柔韌性與緩衝性提昇，植毛部對於牙齦的接觸感變得良好，可獲得對於牙齦的良好的按摩效果，並可提高使用感。In the toothbrush of the 2nd invention, since the product (A'×B) of the curvature amount A' of the head and the curvature B of the neck is 2.5 to 12, an appropriate curvature in harmony with the head and the neck can be obtained. As a result, the toothbrush bristles implanted in the head portion of the toothbrush can easily reach every corner of the oral cavity such as the depths of the molars, and the cleaning power in the oral cavity can be improved. Furthermore, the toothbrush bristles can be easily entered into the periodontal pocket, and the cleaning power of the periodontal pocket can be improved. In addition, by obtaining a moderate curvature, the flexibility and cushioning properties of the hair-implanted part are improved, the touch of the hair-implanted part to the gums becomes good, a good massage effect on the gums can be obtained, and the feeling of use can be improved.

以下利用實施例來更詳細地說明本發明，但本發明並不限定於該些實施例。 本實施例中所使用的材料如下述般。 ＜柄體＞ ・POM-1（彎曲彈性係數：2600 MPa） ・PP-1（彎曲彈性係數：1900 MPa） ・PP-2（彎曲彈性係數：1400 MPa） ＜牙刷毛＞ ・PBTHereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Materials used in this example are as follows. ＜Handle body＞ ・POM-1 (Flexural modulus: 2600 MPa) ・PP-1 (Flexural modulus of elasticity: 1900 MPa) ・PP-2 (Flexural modulus: 1400 MPa) ＜Toothbrush bristles＞ ・PBT

（實施例1～實施例3、比較例1～比較例2） 製作與圖1A及圖1B相同的牙刷。各例的牙刷的柄體的長度L1為180 mm，將頭部的厚度T1、頭部的長度L2、頭部的寬度W1、頸部的最小直徑T2、頸部的長度L3、邊界P2的寬度、邊界P2的厚度設為表1中所示的尺寸。於頭部中，捆紮23根牙刷毛（PBT製）來作為毛束，以圖1A中所示的植毛圖案植設該毛束，而設置植毛部。再者，將各例的牙刷毛的長度及粗度設為表1中所示的尺寸。 各例的牙刷的材質如表1中所示般。 另外，利用所述方法測定各例的牙刷的頭部的彎曲量A與頸部的彎曲量B、毛尖強度（邊界P1的位置：自柄體10的前端9起31.5 mm，邊界P2的位置：自柄體10的前端9起76.0 mm）。 將各例的牙刷的彎曲量A、彎曲量B、A×B及毛尖強度示於表1中。(Example 1 to Example 3, Comparative Example 1 to Comparative Example 2) A toothbrush similar to that shown in FIGS. 1A and 1B was produced. The length L1 of the handle body of the toothbrush of each example is 180 mm, and the thickness T1 of the head, the length L2 of the head, the width W1 of the head, the minimum diameter T2 of the neck, the length L3 of the neck, and the width of the boundary P2 , The thickness of the boundary P2 is set to the dimensions shown in Table 1. In the head, 23 toothbrush bristles (made from PBT) were bundled as a hair bundle, and the hair bundle was implanted in the hair implantation pattern shown in FIG. 1A to provide a hair implantation portion. In addition, the length and thickness of the toothbrush bristles of each example were made into the dimension shown in Table 1. The material of the toothbrush of each example is as shown in Table 1. In addition, the bending amount A of the head portion, the bending amount B of the neck portion, and the bristle strength (position of boundary P1: 31.5 mm from the front end 9 of the handle body 10, position of boundary P2: 76.0 mm from the front end 9 of the handle body 10). Table 1 shows the bending amount A, bending amount B, A×B, and bristle tip strength of the toothbrush of each example.

（實施例4～實施例9、比較例3～比較例7） 製作與圖1A及圖1B相同的牙刷。各例的牙刷的柄體的長度L1為180 mm（實施例4～實施例9、比較例3～比較例7），將頭部的厚度T1、頭部的長度L2、頭部的寬度W1、頸部的最小直徑T2、頸部的長度L3、邊界P2的寬度、邊界P2的厚度設為表2及表3中所示的尺寸。於頭部中，捆紮23根牙刷毛（PBT製）來作為毛束，以圖1A中所示的植毛圖案植設該毛束，而設置植毛部。再者，將各例的牙刷毛的長度及粗度設為表2及表3中所示的尺寸。 各例的牙刷的材質如表2及表3中所示般。 另外，利用所述方法測定各例的牙刷的頭部的彎曲量A、頭部的彎曲量A'、頸部的彎曲量B、及毛尖強度。於各例的牙刷中，固定牙刷的邊界P1的位置及邊界P2的位置如所述般決定。 將各例的牙刷的彎曲量A、彎曲量A'、彎曲量B、A×B、A'×B、及毛尖強度示於表2及表3中。(Example 4 to Example 9, Comparative Example 3 to Comparative Example 7) A toothbrush similar to that shown in FIGS. 1A and 1B was produced. The length L1 of the handle body of the toothbrush of each example was 180 mm (Examples 4 to 9, Comparative Examples 3 to 7), and the thickness T1 of the head, the length L2 of the head, the width W1 of the head, The minimum diameter T2 of the neck portion, the length L3 of the neck portion, the width of the border P2, and the thickness of the border P2 were set to the dimensions shown in Tables 2 and 3. In the head, 23 toothbrush bristles (made from PBT) were bundled as a hair bundle, and the hair bundle was implanted in the hair implantation pattern shown in FIG. 1A to provide a hair implantation portion. In addition, the length and thickness of the toothbrush bristles of each example were made into the dimension shown in Table 2 and Table 3. The material of the toothbrush of each example is as shown in Table 2 and Table 3. Moreover, the bending amount A of the head part, the bending amount A' of the head part, the bending amount B of the neck part, and the bristle tip strength of the toothbrush of each example were measured by the said method. In the toothbrush of each example, the position of the boundary P1 and the position of the boundary P2 at which the toothbrush is fixed are determined as described above. Table 2 and Table 3 show the bending amount A, bending amount A', bending amount B, A×B, A'×B, and bristle tip strength of the toothbrush of each example.

另外，關於各例的牙刷，如下述般評價清掃力、使用感、操作性。 將各自的評價結果示於表1～表3中。In addition, about the toothbrush of each example, the cleaning power, the feeling of use, and the operability were evaluated as follows. The respective evaluation results are shown in Tables 1 to 3.

[臼齒的深處（臼齒的咽喉側）的清掃力] 10名監控人員利用各例的牙刷對口腔內進行清掃，並以下述的評價基準評價此時的臼齒的深處的清掃效果。將10名監控人員的平均分為4分以上設為「○」，將平均分為2分以上、未滿4分設為「△」，將平均分未滿2分設為「×」。 ＜評價基準＞ 5分：非常感覺到臼齒的深處的污垢掉落的觸感。 4分：強烈感覺到臼齒的深處的污垢掉落的觸感。 3分：感覺到臼齒的深處的污垢掉落的觸感。 2分：不怎麼感覺到臼齒的深處的污垢掉落的觸感。 1分：感覺不到臼齒的深處的污垢掉落的觸感。[Cleaning force in the depths of the molars (the throat side of the molars)] The inside of the oral cavity was cleaned with the toothbrush of each example by 10 monitors, and the cleaning effect in the depth of the molar teeth at that time was evaluated according to the following evaluation criteria. The average score of 10 monitoring personnel was set as "○", the average score of 2 points or more and less than 4 points was set as "△", and the average score of less than 2 points was set as "X". <Evaluation Criteria> 5 points: The tactile sensation of the dirt falling from the depths of the molars is very much felt. 4 points: The touch feeling of the dirt dropping from the deep part of the molar is strongly felt. 3 points: The touch feeling of the dirt falling from the depths of the molars is felt. 2 points: The feeling that the dirt in the depths of the molars falls off is not so much felt. 1 point: The feeling of dropping of dirt deep in the molars is not felt.

[使用感的評價] 10名監控人員利用各例的牙刷對口腔內進行清掃，以下述的評價基準評價此時的對於牙齦的接觸感，並評價牙刷的使用感。將10名監控人員的平均分為4分以上設為「○」，將平均分為2分以上、未滿4分設為「△」，將平均分未滿2分設為「×」。 ＜評價基準＞ 5分：無牙齦的疼痛，接觸感非常優異。 4分：無牙齦的疼痛，接觸感很優異。 3分：無牙齦的疼痛，接觸感優異。 2分：牙齦感覺到輕微的疼痛。 1分：牙齦感覺到強烈的疼痛。[Evaluation of usability] The inside of the oral cavity was cleaned with the toothbrush of each example by 10 monitors, and the touch feeling with respect to the gums at that time was evaluated by the following evaluation criteria, and the use feeling of the toothbrush was evaluated. The average score of 10 monitoring personnel was set as "○", the average score of 2 points or more and less than 4 points was set as "△", and the average score of less than 2 points was set as "X". <Evaluation Criteria> 5 points: There is no gingival pain, and the touch feeling is very excellent. 4 points: There is no gingival pain, and the touch feeling is excellent. 3 points: There is no gingival pain, and the touch feeling is excellent. 2 points: Slight pain is felt in the gums. 1 point: Strong pain is felt in the gums.

[於口腔內的操作性] 10名監控人員對口腔內進行清掃，並對各例的牙刷的操作性進行評價。操作性的評價設為1分～7分的7個階段，越感覺到操作性良好者，分數變得越高。將10名監控人員的平均分分類成下述判定基準，而判定於口腔內的操作性。 ＜判定基準＞ ○：平均分為5分以上。 △：平均分為3分以上、未滿5分。 ×：平均分未滿3分。[operability in the oral cavity] Ten monitors cleaned the inside of the oral cavity, and evaluated the operability of the toothbrush of each example. The evaluation of operability was made into 7 stages of 1 to 7 points, and the score became higher as the operability was felt to be good. The average score of 10 monitoring personnel was classified into the following judgment criteria, and was judged on the operability in the oral cavity. <Judgment Criteria> ○: The average score is 5 points or more. △: The average score is 3 points or more and less than 5 points. ×: The average score is less than 3 points.

[表1]   實施例1 實施例2 實施例3 比較例1 比較例2 頭部的彎曲量A 0.87 0.89 1.77 0.18 3.11 頸部的彎曲量B 2.90 2.60 3.90 2.00 6.30 A×B 2.50 2.30 6.90 0.40 19.6 頭部的厚度T1（mm） 2.6 3.0 2.6 4.5 2.6 頭部的長度L2（mm） 31.5 31.5 31.5 31.5 31.5 頭部的寬度W1（mm） 10.5 10.5 10.5 10.5 10.5 頸部的最小直徑T2（mm） 3.5 4.0 3.5 5.0 3.5 頸部的長度L3（mm） 44.5 44.5 44.5 44.5 44.5 P2的寬度（mm） 7.5 7.5 7.5 7.5 7.5 P2的厚度（mm） 9.2 9.2 9.2 9.2 9.2 毛尖強度（N） 2.5 2.15 2.57 2.51 2.1 柄體的材質 POM-1 PP-1 PP-1 PP-2 PP-2 牙刷毛的材質 PBT PBT PBT PBT PBT 牙刷毛的長度（mm） 29 29 29 31 29 牙刷毛的粗度（mil） 7.5 7.5 7.5 7.5 7.5 植毛深度（mm） 2.2 2.5 2.2 3.8 2.2 臼齒的深處的清掃力 平均分 4.8 4.4 4.6 1.2 1.9 評價 ○ ○ ○ × × 使用感 平均分 4.2 4.3 4.2 3.2 4.2 評價 ○ ○ ○ △ ○ 口腔內操作性 平均分 6.6 6.2 4.9 2.7 2.1 評價 ○ ○ △ × × [Table 1] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 The amount of curvature of the head A 0.87 0.89 1.77 0.18 3.11 Bending amount of neck 2.90 2.60 3.90 2.00 6.30 A×B 2.50 2.30 6.90 0.40 19.6 Thickness of the head T1 (mm) 2.6 3.0 2.6 4.5 2.6 The length of the head L2 (mm) 31.5 31.5 31.5 31.5 31.5 Width of the head W1 (mm) 10.5 10.5 10.5 10.5 10.5 Minimum diameter of neck T2 (mm) 3.5 4.0 3.5 5.0 3.5 Length of neck L3 (mm) 44.5 44.5 44.5 44.5 44.5 Width of P2 (mm) 7.5 7.5 7.5 7.5 7.5 Thickness of P2 (mm) 9.2 9.2 9.2 9.2 9.2 Hair tip strength (N) 2.5 2.15 2.57 2.51 2.1 handle body material POM-1 PP-1 PP-1 PP-2 PP-2 Material of toothbrush bristles PBT PBT PBT PBT PBT Length of toothbrush bristles (mm) 29 29 29 31 29 Thickness of toothbrush bristles (mil) 7.5 7.5 7.5 7.5 7.5 Flocking depth (mm) 2.2 2.5 2.2 3.8 2.2 Cleaning force in the depths of molars The average score 4.8 4.4 4.6 1.2 1.9 Evaluation ○ ○ ○ × × sense of use The average score 4.2 4.3 4.2 3.2 4.2 Evaluation ○ ○ ○ △ ○ Intraoral maneuverability The average score 6.6 6.2 4.9 2.7 2.1 Evaluation ○ ○ △ × ×

[表2]   實施例4 實施例5 實施例6 實施例7 實施例8 實施例9 頭部的彎曲量A 0.72 0.51 1.26 0.70 0.78 0.93 頸部的彎曲量B 2.58 2.43 2.45 2.44 2.33 2.52 頭部的彎曲量A' 1.68 1.22 2.70 1.73 1.86 2.12 A×B 1.86 1.24 3.09 1.71 1.82 2.34 A'×B 4.33 2.96 6.62 4.22 4.33 5.34 頭部的厚度T1（mm） 3.0 3.0 3.0 3.0 3.0 2.6 頭部的長度L2（mm） 28.9 25.3 33.7 28.7 30.0 28.7 頭部的寬度W1（mm） 9.1 10.6 10.3 10.3 10.5 10.3 頸部的最小直徑T2（mm） 4.0 4.0 4.0 4.0 4.0 3.0 頸部的長度L3（mm） 42.0 45.4 37.3 42.2 40.3 42.2 P2的寬度（mm） 7.8 7.8 7.8 7.8 7.8 7.8 P2的厚度（mm） 9.4 9.4 9.4 9.4 9.4 9.4 毛尖強度（N） 1.41 1.87 2.37 1.89 3.58 1.89 柄體的材質 PP-1 PP-1 PP-1 PP-1 PP-1 POM-1 牙刷毛的材質 PBT PBT PBT PBT PBT PBT 牙刷毛的長度（mm） 29 27 29 29 25 29 牙刷毛的粗度（mil） 5.5 7.0 7.5 7.5 9 7.5 植毛深度（mm） 2.5 2.5 2.5 2.5 2.5 2.5 臼齒的深處的清掃力 平均分 4.5 4.8 4.2 4.4 4.4 4.9 評價 ○ ○ ○ ○ ○ ○ 使用感 平均分 4.8 4.6 4.4 4.5 4.1 4.5 評價 ○ ○ ○ ○ ○ ○ 口腔內操作性 平均分 5.7 6.6 5.9 6.2 6.2 6.7 評價 ○ ○ ○ ○ ○ ○ [Table 2] Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 The amount of curvature of the head A 0.72 0.51 1.26 0.70 0.78 0.93 Bending amount of neck 2.58 2.43 2.45 2.44 2.33 2.52 The amount of curvature of the head A' 1.68 1.22 2.70 1.73 1.86 2.12 A×B 1.86 1.24 3.09 1.71 1.82 2.34 A'×B 4.33 2.96 6.62 4.22 4.33 5.34 Thickness of the head T1 (mm) 3.0 3.0 3.0 3.0 3.0 2.6 The length of the head L2 (mm) 28.9 25.3 33.7 28.7 30.0 28.7 Width of the head W1 (mm) 9.1 10.6 10.3 10.3 10.5 10.3 Minimum diameter of neck T2 (mm) 4.0 4.0 4.0 4.0 4.0 3.0 Length of neck L3 (mm) 42.0 45.4 37.3 42.2 40.3 42.2 Width of P2 (mm) 7.8 7.8 7.8 7.8 7.8 7.8 Thickness of P2 (mm) 9.4 9.4 9.4 9.4 9.4 9.4 Hair tip strength (N) 1.41 1.87 2.37 1.89 3.58 1.89 handle body material PP-1 PP-1 PP-1 PP-1 PP-1 POM-1 Material of toothbrush bristles PBT PBT PBT PBT PBT PBT Length of toothbrush bristles (mm) 29 27 29 29 25 29 Thickness of toothbrush bristles (mil) 5.5 7.0 7.5 7.5 9 7.5 Flocking depth (mm) 2.5 2.5 2.5 2.5 2.5 2.5 Cleaning force in the depths of molars The average score 4.5 4.8 4.2 4.4 4.4 4.9 Evaluation ○ ○ ○ ○ ○ ○ sense of use The average score 4.8 4.6 4.4 4.5 4.1 4.5 Evaluation ○ ○ ○ ○ ○ ○ Intraoral maneuverability The average score 5.7 6.6 5.9 6.2 6.2 6.7 Evaluation ○ ○ ○ ○ ○ ○

[表3]   比較例3 比較例4 比較例5 比較例6 比較例7 頭部的彎曲量A 0.29 0.38 0.19 0.33 0.35 頸部的彎曲量B 1.70 1.79 2.20 1.97 1.79 頭部的彎曲量A' 0.77 1.17 0.52 0.76 0.61 A×B 0.49 0.68 0.42 0.65 0.63 A'×B 1.31 2.09 1.14 1.50 1.09 頭部的厚度T1（mm） 4.5 4.5 4.5 4.5 4.5 頭部的長度L2（mm） 28.0 34.0 24.8 28.0 32.2 頭部的寬度W1（mm） 8.8 10.3 10.6 10.3 10.5 頸部的最小直徑T2（mm） 5.0 5.0 5.0 5.0 5.0 頸部的長度L3（mm） 42.7 37.0 45.9 42.7 39.8 P2的寬度（mm） 7.8 7.8 7.8 7.8 7.5 P2的厚度（mm） 9.4 9.4 9.4 9.4 9.0 柄體的材質 PP-2 PP-2 PP-2 PP-2 PP-1 牙刷毛的材質 PBT PBT PBT PBT PBT 牙刷毛的長度（mm） 31 31 31 31 27 牙刷毛的粗度（mil） 7.5 7.5 7.5 7.5 7.5 植毛深度（mm） 3.8 3.8 3.8 3.8 3.8 臼齒的深處的清掃力 平均分 1.6 1.0 1.9 1.2 1.2 評價 × × × × × 使用感 平均分 3.8 3.5 3.1 3.2 2.9 評價 △ △ △ △ △ 口腔內操作性 平均分 2.9 2.1 3.5 2.7 2.7 評價 × × △ × × [table 3] Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 The amount of curvature of the head A 0.29 0.38 0.19 0.33 0.35 Bending amount of neck 1.70 1.79 2.20 1.97 1.79 The amount of curvature of the head A' 0.77 1.17 0.52 0.76 0.61 A×B 0.49 0.68 0.42 0.65 0.63 A'×B 1.31 2.09 1.14 1.50 1.09 Thickness of the head T1 (mm) 4.5 4.5 4.5 4.5 4.5 The length of the head L2 (mm) 28.0 34.0 24.8 28.0 32.2 Width of the head W1 (mm) 8.8 10.3 10.6 10.3 10.5 Minimum diameter of neck T2 (mm) 5.0 5.0 5.0 5.0 5.0 Length of neck L3 (mm) 42.7 37.0 45.9 42.7 39.8 Width of P2 (mm) 7.8 7.8 7.8 7.8 7.5 Thickness of P2 (mm) 9.4 9.4 9.4 9.4 9.0 handle body material PP-2 PP-2 PP-2 PP-2 PP-1 Material of toothbrush bristles PBT PBT PBT PBT PBT Length of toothbrush bristles (mm) 31 31 31 31 27 Thickness of toothbrush bristles (mil) 7.5 7.5 7.5 7.5 7.5 Flocking depth (mm) 3.8 3.8 3.8 3.8 3.8 Cleaning force in the depths of molars The average score 1.6 1.0 1.9 1.2 1.2 Evaluation × × × × × sense of use The average score 3.8 3.5 3.1 3.2 2.9 Evaluation △ △ △ △ △ Intraoral maneuverability The average score 2.9 2.1 3.5 2.7 2.7 Evaluation × × △ × ×

如表1所示，應用本發明的實施例1、實施例2、實施例3的牙刷的口腔內的清掃力優異、且使用感良好。進而，於口腔內的操作性優異。 相對於此，A×B未滿0.8的牙刷（比較例1）、A×B超過10的牙刷（比較例2）的對於臼齒的深處的清掃力並不充分，亦無法獲得於口腔內的良好的操作性。As shown in Table 1, the toothbrushes of Example 1, Example 2, and Example 3 to which the present invention was applied were excellent in the cleaning power in the oral cavity, and the feeling in use was good. Furthermore, it is excellent in operability in the oral cavity. On the other hand, the toothbrush with A×B of less than 0.8 (Comparative Example 1) and the toothbrush with A×B of more than 10 (Comparative Example 2) had insufficient cleaning power with respect to the depths of the molars, and were not able to obtain intraoral cleaning power. Good operability.

另外，如表2所示，應用本發明的牙刷（實施例4～實施例9）的口腔內的清掃力優異、且使用感良好。進而，於口腔內的操作性優異。 相對於此，如表3所示，A×B未滿0.8、且A'×B未滿3的牙刷（比較例3～比較例7）的對於臼齒的深處的清掃力、對於牙周袋的清掃力、使用感、及於口腔內的操作性的至少一者並不充分。 根據以上的結果，可確認應用本發明的牙刷的口腔內的清掃力更優異、且使用感更優異。Moreover, as shown in Table 2, the cleaning power in the oral cavity to which the toothbrush (Example 4 - Example 9) of this invention was applied was excellent, and the usability was favorable. Furthermore, it is excellent in operability in the oral cavity. On the other hand, as shown in Table 3, the toothbrushes with A×B less than 0.8 and A′×B less than 3 (Comparative Examples 3 to 7) have the cleaning force for the depths of the molars and the periodontal pockets. At least one of the cleaning power, the feeling of use, and the operability in the oral cavity is insufficient. From the above results, it was confirmed that the toothbrush to which the present invention is applied has more excellent cleaning power in the oral cavity and more excellent feeling in use.

1:牙刷 2:頭部 4:頸部 6:柄部 9:柄體的前端 10:柄體 20:植毛面 22:植毛孔 100:夾具 102:秤錘 200:ISO毛硬強度試驗機 202:基準面 204:梯狀物 a:H1 與H0 的差的絕對值 H0 :基準高度 H1 :高度 L1、L2、L3、L4:長度 P1、P2:邊界 R1、R2:曲線或直線 S:相對於植毛部長軸方向，自植毛部前端起10±3%的位置 T2:頸部的厚度（頸部的最小直徑） W1:頭部的寬度 W2:頸部的寬度1: Toothbrush 2: Head 4: Neck 6: Handle 9: Front end of handle body 10: Handle body 20: Implantation surface 22: Implantation hole 100: Fixture 102: Balance weight 200: ISO bristle hardness tester 202: Reference plane 204: ladder a: absolute value of difference between H1 and H0 H0 : reference height H1 : height L1, L2, L3, L4: length P1, P2: boundary R1, R2: curve or straight line S : The position of 10±3% from the tip of the hair-planting part with respect to the hair-planting long axis direction T2: The thickness of the neck (minimum diameter of the neck) W1: The width of the head W2: The width of the neck

圖1A是本發明的一實施形態的牙刷的平面圖。 圖1B是本發明的一實施形態的牙刷的側面圖。 圖2A是說明頭部的彎曲量的測定方法的圖。 圖2B是說明頭部的彎曲量的測定方法的圖。 圖3是說明毛尖強度的測定方法的圖。Fig. 1A is a plan view of the toothbrush according to one embodiment of the present invention. Fig. 1B is a side view of the toothbrush according to the embodiment of the present invention. FIG. 2A is a diagram illustrating a method of measuring the amount of curvature of the head. 2B is a diagram illustrating a method of measuring the amount of curvature of the head. FIG. 3 is a diagram illustrating a method of measuring hair tip strength.

1:牙刷 1: toothbrush

2:頭部 2: head

4:頸部 4: neck

6:柄部 6: Handle

9:柄體的前端 9: The front end of the handle body

10:柄體 10: Handle body

20:植毛面 20: Flocked surface

22:植毛孔 22: Plant pores

L1、L2、L3、L4:長度 L1, L2, L3, L4: length

P1、P2:邊界 P1, P2: Boundary

R1、R2:曲線或直線 R1, R2: Curve or straight line

W1:頭部的寬度 W1: the width of the head

W2:頸部的寬度 W2: The width of the neck

Claims (29)

一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且藉由下述的方法(α)所測定的所述頭部的彎曲量A與藉由下述的方法(β)所測定的所述頸部的彎曲量B的積為0.8~10，所述彎曲量A為0.5~3.0，所述彎曲量B為2.1~5.0，所述頭部的厚度為2.0mm~4.0mm、且所述頸部的最小的寬度與最小的厚度中的小的一方為3.0mm~4.5mm，所述柄體的材質為聚丙烯樹脂，方法(α)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自 所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanting surface of the head is implanted. There are hair bundles, and the product of the bending amount A of the head portion measured by the following method (α) and the bending amount B of the neck portion measured by the following method (β) is 0.8 ~10, the bending amount A is 0.5~3.0, the bending amount B is 2.1~5.0, the thickness of the head is 2.0mm~4.0mm, and the minimum width and minimum thickness of the neck are between The smaller one is 3.0mm~4.5mm, the material of the handle body is polypropylene resin, method (α): make the hair planting surface of the head face upward in the vertical direction, so that the head and the The height of the front end of the handle body in the state where the position of the boundary of the neck portion is fixed is the reference height, and in the fixed state, the length in the long axis direction of the hair-implanted portion in the head portion is A weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implanted portion, and the displacement amount of the height of the front end of the handle body from the reference height after 10 seconds was defined as the head The bending amount A of the part, wherein the unit of the displacement is mm; method (β): make the hair-planting surface of the head face upward in the vertical direction, so as to make the boundary between the neck and the shank part The height of the front end of the handle body in the state where the position is fixed is the reference height, and in the fixed state, the length in the long axis direction of the hair-implantation part in the head part is determined from the hair-implantation part. Hang a weighing weight of 200g at a position of 50±3% from the front end, and 10 seconds later, the front end of the handle body is automatically adjusted. The displacement amount of the height from the reference height is set as the bending amount B of the neck portion, and the unit of the displacement amount is mm. 如請求項1所述的牙刷，其中所述頭部的彎曲量A與所述頸部的彎曲量B的積為2~10。 The toothbrush according to claim 1, wherein the product of the bending amount A of the head portion and the bending amount B of the neck portion is 2-10. 如請求項1或2所述的牙刷，其中藉由下述的方法(α')所測定的所述頭部的彎曲量A'與所述頸部的彎曲量B的積為2.5~12，方法(α')：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A'，其中所述位移量的單位為mm。 The toothbrush according to claim 1 or 2, wherein the product of the curvature amount A' of the head portion and the curvature amount B of the neck portion measured by the following method (α') is 2.5 to 12, Method (α'): The hair-implanted surface of the head is directed upward in the vertical direction, and a position moved 10 mm from the position of the boundary between the head and the neck toward the shank is fixed The height of the front end of the lower handle body is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head, 10± from the front end of the hair-implanted part A weight of 200 g is suspended at a position of 3%, and the displacement amount of the height of the front end of the handle body from the reference height after 10 seconds is set as the bending amount A' of the head, wherein the The unit of displacement is mm. 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且藉由下述的方法(α')所測定的所述頭部的彎曲量A'與藉由下述的方法(β)所測定的所述頸部的彎曲量B的積為2.5~12，所述彎曲量A'為1~5，所述彎曲量B為2.1~5.0，所述頭部的厚度為2.0mm~4.0mm、且所述頸部的最小的寬度與最小的厚度中的小的一方為3.0mm~4.5mm， 所述柄體的材質為聚丙烯樹脂，方法(α')：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A'，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanting surface of the head is implanted. There are hair bundles, and the product of the bending amount A' of the head portion measured by the following method (α') and the bending amount B of the neck portion measured by the following method (β) is 2.5~12, the bending amount A' is 1~5, the bending amount B is 2.1~5.0, the thickness of the head is 2.0mm~4.0mm, and the minimum width and minimum width of the neck are The smaller one of the thicknesses is 3.0mm~4.5mm, The material of the handle body is polypropylene resin, and the method (α'): the hair-implanted surface of the head is directed upward in the vertical direction, so that the position from the boundary between the head and the neck is directed to the The height of the front end of the shank body in a state where the shank portion side is moved by 10 mm and the position is fixed is the reference height, and in the fixed state, it is further relative to the length of the long axis direction of the hair planting portion in the head portion, A weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implanted part, and the displacement amount of the height from the reference height of the front end of the handle body after 10 seconds was set as the The amount of curvature A' of the head, wherein the unit of the displacement is mm; The height of the front end of the shank body in the state where the position of the boundary is fixed is the reference height, and in the fixed state, the length in the long axis direction of the hair-planting part in the head part is determined from the hair-planting part in the fixed state. A weight of 200 g was suspended at a position of 50±3% from the front end of the shank, and the displacement of the height of the front end of the handle body from the reference height after 10 seconds was set as the bending amount of the neck B, wherein the unit of the displacement is mm. 如請求項1、2或4所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.5mm。 The toothbrush of claim 1, 2 or 4, wherein the neck has a minimum width of 3.0 mm to 4.5 mm. 如請求項1、2或4所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7N~3.0N。 The toothbrush according to claim 1, 2 or 4, wherein the bristle tip strength of the toothbrush bristles constituting the bristle bundle is 1.7N to 3.0N. 如請求項3所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.5mm。 The toothbrush according to claim 3, wherein the minimum width of the neck is 3.0 mm to 4.5 mm. 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛，所述頭部的厚度為2.0mm~4.0mm，所述頸部的最小的寬度為3.0mm~4.5mm，最小的厚度為3.0mm~4.5mm，藉由下述的方法(α')所測定的所述頭部的彎曲量A'與藉由下述的方法(β)所測定的所述頸部的彎曲量B的積為2.5~12，所述彎曲量A'為1~5mm，所述彎曲量B與所述彎曲量A'的比(B/A')為0.8~2.5，方法(α')：使所述頭部的植毛面朝向鉛垂方向的上方，以將自所述頭部與所述頸部的邊界的位置朝所述柄部側移動10mm的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A'，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部 中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanting surface of the head is implanted. There are hair bundles, and the shape of the hair bundles planted on the hair planting surface of the head is a flat line type hair planting, the thickness of the head is 2.0mm~4.0mm, and the minimum thickness of the neck is The width is 3.0mm~4.5mm, and the minimum thickness is 3.0mm~4.5mm. The bending amount A' of the head measured by the following method (α') is different from that measured by the following method (β'). ) The product of the measured bending amount B of the neck is 2.5 to 12, the bending amount A' is 1 to 5 mm, and the ratio of the bending amount B to the bending amount A' (B/A') 0.8 to 2.5, method (α'): move the position of the boundary between the head and the neck by 10 mm toward the shank with the hair-implanted surface of the head facing upward in the vertical direction The height of the front end of the handle body in the state where the position is fixed is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head part, from the hair-implanted part A weight of 200 g is suspended at a position of 10±3% from the front end of the handle, and the displacement of the height of the front end of the handle body from the reference height after 10 seconds is set as the bending amount A of the head ', wherein the unit of the displacement is mm; method (β): the state where the hair-planting surface of the head is directed upward in the vertical direction to fix the position of the boundary between the neck and the shank The height of the front end of the lower handle body is the reference height, in the fixed state, and then relative to the head The length of the long-axis direction of the hair-implanted portion in The displacement amount of the height from the height is set as the bending amount B of the neck, wherein the unit of the displacement amount is mm. 如請求項8所述的牙刷，其中所述頭部的彎曲量A'與所述頸部的彎曲量B的積為2.5~10。 The toothbrush according to claim 8, wherein the product of the bending amount A' of the head portion and the bending amount B of the neck portion is 2.5 to 10. 如請求項8或9所述的牙刷，其中所述彎曲量B與所述彎曲量A'的比(B/A')為0.8~2.0。 The toothbrush according to claim 8 or 9, wherein a ratio (B/A') of the amount of curvature B to the amount of curvature A' is 0.8 to 2.0. 如請求項8或9所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.2mm。 The toothbrush according to claim 8 or 9, wherein the minimum width of the neck is 3.0 mm to 4.2 mm. 如請求項8或9所述的牙刷，其中所述彎曲量B為2.1~5.0mm。 The toothbrush according to claim 8 or 9, wherein the bending amount B is 2.1 to 5.0 mm. 如請求項8或9所述的牙刷，其中藉由下述的方法(α)所測定的所述頭部的彎曲量A與所述頸部的彎曲量B的積為2~10，方法(α)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A，其中所述位移量的單位為mm。 The toothbrush according to claim 8 or 9, wherein the product of the bending amount A of the head portion and the bending amount B of the neck portion measured by the following method (α) is 2 to 10, and the method ( α): The hair-implanted surface of the head is directed upward in the vertical direction, and the height of the front end of the handle body in a state where the position of the boundary between the head and the neck is fixed as a reference height, In the fixed state, a weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implantation part with respect to the length in the long axis direction of the hair-implantation part in the head, and 10 The displacement amount of the height of the front end of the handle body from the reference height in seconds is referred to as the bending amount A of the head, and the unit of the displacement amount is mm. 如請求項13所述的牙刷，其中所述彎曲量B與所述彎曲量A的比(B/A)為1.5~5.0。 The toothbrush according to claim 13, wherein a ratio (B/A) of the amount of curvature B to the amount of curvature A is 1.5 to 5.0. 如請求項13所述的牙刷，其中所述彎曲量A為0.4~3.0mm。 The toothbrush according to claim 13, wherein the bending amount A is 0.4 to 3.0 mm. 如請求項8或9所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7N~3.0N。 The toothbrush according to claim 8 or 9, wherein the bristle tip strength of the toothbrush bristles constituting the bristle bundle is 1.7N to 3.0N. 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛，所述頭部的厚度為2.0mm~4.0mm，所述頸部的最小的寬度為3.0mm~4.5mm，所述柄體的材質為聚丙烯樹脂，當將藉由下述的方法(α)所測定的所述頭部的彎曲量設為A，並將藉由下述的方法(β)所測定的所述頸部的彎曲量設為B時，相對於頭部的長度(L2)的頭部的彎曲量(A/L2)的值X為0.015~0.045，相對於所述頭部的長度(L2)與頸部的長度(L3)的和(L2+L3)的所述頸部的彎曲量(B/(L2+L3))的值Y與所述X的比，即Y/X為0.8~2.0，方法(α)：使所述頭部的植毛面朝向鉛垂方向的上方，以將 所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanting surface of the head is implanted. There are hair bundles, and the shape of the hair bundles planted on the hair planting surface of the head is a flat line type hair planting, the thickness of the head is 2.0mm~4.0mm, and the minimum thickness of the neck is The width is 3.0mm~4.5mm, the material of the handle body is polypropylene resin, when the amount of curvature of the head measured by the following method (α) is set as A, and the When the amount of curvature of the neck measured by the method (β) described above is set as B, the value X of the amount of curvature of the head (A/L2) relative to the length (L2) of the head is 0.015 to 0.045. The value of the curvature of the neck (B/(L2+L3)), which is the sum of the length of the head (L2) and the length of the neck (L3) (L2+L3), and the value of the X ratio, that is, Y/X is 0.8~2.0, method (α): make the hair-planting surface of the head face upward in the vertical direction, so that the The height of the front end of the handle body in the state where the position of the boundary between the head and the neck is fixed is the reference height, and in the fixed state, it is further relative to the length of the hair-implanted part in the head. For the length in the axial direction, a weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implanted part, and the height of the front end of the handle body from the reference height was displaced after 10 seconds. The amount is set as the bending amount A of the head, wherein the unit of the displacement is mm; The height of the front end of the shank body in the state where the position of the boundary of the shank portion is fixed is the reference height, and in the fixed state, the length relative to the long axis direction of the hair planting portion in the head portion is A weight of 200 g was suspended at a position of 50±3% from the front end of the hair-implanted portion, and the displacement amount of the height of the front end of the handle body from the reference height after 10 seconds was defined as the neck The bending amount B of the part, wherein the unit of the displacement amount is mm. 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上植設有毛束，並且於所述頭部的所述植毛面上植設有所述毛束的形態為平線式植毛，所述頭部的厚度為2.0mm~4.0mm，所述頸部的最小的寬度為3.0mm~4.5mm，所述柄體的材質為聚縮醛樹脂，當將藉由下述的方法(α)所測定的所述頭部的彎曲量設為 A，並將藉由下述的方法(β)所測定的所述頸部的彎曲量設為B時，相對於頭部的長度(L2)的頭部的彎曲量(A/L2)的值X為0.027~0.035，相對於所述頭部的長度(L2)與頸部的長度(L3)的和(L2+L3)的所述頸部的彎曲量(B/(L2+L3))的值Y與所述X的比，即Y/X為1.0~1.4，方法(α)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck, and a bristle-implanting surface of the head is implanted. There are hair bundles, and the shape of the hair bundles planted on the hair planting surface of the head is a flat line type hair planting, the thickness of the head is 2.0mm~4.0mm, and the minimum thickness of the neck is The width is 3.0mm~4.5mm, the material of the handle body is polyacetal resin, and the amount of curvature of the head measured by the following method (α) is set as A, when the amount of curvature of the neck measured by the following method (β) is taken as B, the value of the amount of curvature of the head (A/L2) relative to the length (L2) of the head X is 0.027 to 0.035, which is calculated by the amount of curvature of the neck (B/(L2+L3)) relative to the sum of the length (L2) of the head and the length (L3) of the neck (L2+L3). The ratio of the value Y to the X, that is, Y/X, is 1.0 to 1.4. Method (α): The hair-planting surface of the head is directed upward in the vertical direction, so that the distance between the head and the neck is adjusted. The height of the front end of the shank body in the state where the position of the boundary is fixed is the reference height, and in the fixed state, the length in the long axis direction of the hair-planting part in the head part is determined from the hair-planting part in the fixed state. A weight of 200 g was suspended at a position of 10±3% from the front end of the handle, and the displacement of the height of the front end of the handle body from the reference height after 10 seconds was set as the bending amount of the head A, wherein the unit of the displacement is mm; Method (β): The position of the boundary between the neck and the shank is fixed with the hair-implanted surface of the head facing upward in the vertical direction The height of the front end of the lower handle body is the reference height, and in the fixed state, further relative to the length in the long axis direction of the hair-implanted part in the head, 50± from the front end of the hair-implanted part A weighing weight of 200 g is suspended at a position of 3%, and the displacement amount of the height of the front end of the handle body from the reference height after 10 seconds is set as the bending amount B of the neck, wherein the displacement The unit of quantity is mm. 如請求項17或18所述的牙刷，其中所述彎曲量A為0.4~3.0mm，所述彎曲量B為2.1~5.0mm。 The toothbrush according to claim 17 or 18, wherein the amount of curvature A is 0.4 to 3.0 mm, and the amount of curvature B is 2.1 to 5.0 mm. 如請求項17或18所述的牙刷，其中所述頸部的最小的厚度為3.0mm~4.5mm。 The toothbrush of claim 17 or 18, wherein the neck has a minimum thickness of 3.0 mm to 4.5 mm. 如請求項17或18所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.2mm。 The toothbrush of claim 17 or 18, wherein the neck has a minimum width of 3.0 mm to 4.2 mm. 如請求項20所述的牙刷，其中所述頸部的最小的厚度為3.0mm~4.2mm。 The toothbrush of claim 20, wherein the neck has a minimum thickness of 3.0 mm to 4.2 mm. 一種牙刷，其特徵在於：包括具備頭部、延伸設置於所述頭部的頸部、及延伸設置於所述頸部的柄部的柄體，並於所述頭部的植毛面上藉由平線式植毛植設有多個毛束，所述頭部的厚度為2.0mm~4.0mm，所述頸部的最小的寬度與最小的厚度中的小的一方為3.0mm~4.5mm，並且在藉由下述的方法(α)所測定的所述頭部的彎曲量A與藉由下述的方法(β)所測定的所述頸部的彎曲量B中，所述彎曲量A為0.4~3.0mm，所述彎曲量B為2.1~5.0mm，所述彎曲量A與所述彎曲量B的差(B-A)為1mm≦(B-A)≦4mm，所述彎曲量A的以mm所表示的數值與所述彎曲量B的以mm所表示的數值的積為0.84~10，方法(α)：使所述頭部的植毛面朝向鉛垂方向的上方，以將 所述頭部與所述頸部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起10±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頭部的彎曲量A，其中所述位移量的單位為mm；方法(β)：使所述頭部的植毛面朝向鉛垂方向的上方，以將所述頸部與所述柄部的邊界的位置固定的狀態下的所述柄體的前端的高度為基準高度，於所述固定狀態下，進而相對於所述頭部中的植毛部的長軸方向的長度，於自所述植毛部的前端起50±3%的位置上懸掛200g的秤錘，並將10秒後的所述柄體的前端的自所述基準高度起的高度的位移量設為所述頸部的彎曲量B，其中所述位移量的單位為mm。 A toothbrush is characterized in that: it comprises a handle body having a head, a neck extending from the head, and a handle extending from the neck; The flat-line hair planting is provided with a plurality of hair bundles, the thickness of the head is 2.0mm~4.0mm, the smaller one of the minimum width and the minimum thickness of the neck is 3.0mm~4.5mm, and In the bending amount A of the head portion measured by the following method (α) and the bending amount B of the neck portion measured by the following method (β), the bending amount A is: 0.4~3.0mm, the bending amount B is 2.1~5.0mm, the difference (B-A) between the bending amount A and the bending amount B is 1mm≦(B-A)≦4mm, the bending amount A is expressed in mm. The product of the numerical value expressed and the numerical value expressed in mm of the bending amount B is 0.84 to 10. Method (α): The hair-planting surface of the head is directed upward in the vertical direction, so that the The height of the front end of the handle body in the state where the position of the boundary between the head and the neck is fixed is the reference height, and in the fixed state, it is further relative to the length of the hair-implanted part in the head. For the length in the axial direction, a weight of 200 g was suspended at a position of 10±3% from the front end of the hair-implanted part, and the height of the front end of the handle body from the reference height was displaced after 10 seconds. The amount is set as the bending amount A of the head, wherein the unit of the displacement is mm; The height of the front end of the shank body in the state where the position of the boundary of the shank portion is fixed is the reference height, and in the fixed state, the length relative to the long axis direction of the hair planting portion in the head portion is A weight of 200 g was suspended at a position of 50±3% from the front end of the hair-implanted portion, and the displacement amount of the height of the front end of the handle body from the reference height after 10 seconds was defined as the neck The bending amount B of the part, wherein the unit of the displacement amount is mm. 如請求項23所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.5mm，最小的厚度為3.0mm~4.5mm。 The toothbrush according to claim 23, wherein the minimum width of the neck is 3.0mm-4.5mm, and the minimum thickness is 3.0mm-4.5mm. 如請求項23或24所述的牙刷，其中所述彎曲量A的以mm所表示的數值與所述彎曲量B的以mm所表示的數值的積為2~10。 The toothbrush according to claim 23 or 24, wherein the product of the numerical value expressed in mm of the amount of curvature A and the numerical value expressed in mm of the amount of curvature B is 2 to 10. 如請求項23或24所述的牙刷，其中所述彎曲量A為0.5~2.0mm，所述彎曲量B為2.1~4.0mm。 The toothbrush according to claim 23 or 24, wherein the amount of curvature A is 0.5 to 2.0 mm, and the amount of curvature B is 2.1 to 4.0 mm. 如請求項23或24所述的牙刷，其中構成所述毛束的牙刷毛的毛尖強度為1.7N~3.0N。 The toothbrush according to claim 23 or 24, wherein the bristle tip strength of the toothbrush bristles constituting the bristle bundle is 1.7N to 3.0N. 如請求項23或24所述的牙刷，其中所述頸部的最小的寬度為3.0mm~4.2mm。 The toothbrush of claim 23 or 24, wherein the neck has a minimum width of 3.0 mm to 4.2 mm. 如請求項23或24所述的牙刷，其中所述柄體的材質為聚丙烯樹脂。 The toothbrush according to claim 23 or 24, wherein the handle body is made of polypropylene resin.
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