201210530 六、發明說明： 【發明所屬之技彳椅區域】 發明領域 技術領域 本發明係關於牙刷。 本申請案係主張基於2〇1〇年8月6日在日本提申之特願 2010-177779號之優先權，於此引用其之内容。 C ^tr 發明背景 在為口腔内清掃器具之牙刷中’為了提高為最必須機 能之牙垢去除効果’一直對捆束牙刷用毛而成的毛束的排 列下工夫至今。所知道的係在基本的牙刷中毛束的排列， 係均一直徑的毛束被格子狀或是交錯狀地植設者。 近年’由於衛生意向提高，在牙刷，被要求牙垢除去 效果更上一層的提升，對於這般的需求，提議組合有不同 直徑毛束而成的牙刷，或是組合有不同毛長的毛束而成的 牙刷。 例如’專利文獻1提議下述的牙刷：該牙刷具有前端側 植毛區域與後端側植毛區域’且使前端側植毛區域之植毛 密度向於後端側植毛區域之植毛密度；其中該前述前端側 植毛區域係在頭部偏前端處沿著植毛面的週緣大致U字型 地配置有大口徑毛束，而後端側植毛區域係在頭部偏後端 處配設有小口徑毛束。依據此牙刷可獲得在口腔内各部， 特別係特在白齒的咬合面高的刷掃力。 4 201210530 又，在專利文獻2則提議有下述的牙刷：該牙刷具有中 央毛束列與外側毛束列’且中央毛束列之植毛穴總面積與 外側毛束列之植毛穴總面積的比率係1 : 0.6〜1 : 2.8，其中 中央毛束列係沿著頭部長向方向於中央，在内徑為 2_0〜2.8mm之植毛穴植設有屌|J毛者，而外側毛束列係在前述 中央毛束列之兩外側於内徑為1 · 2〜1 · 6 m m之植毛六植設有 刷毛者。依據此牙刷，可效率佳地刷掃位在齒面、齒頸部 以及齒間部等細部之牙垢。 在專利文獻3則提議有下述的牙刷：該牙刷中央毛竊以 及中間毛簇之列係設於外側毛簇之内側，該中央毛蔡之毛 長最高且朝向外側列之毛鎮毛長係依次變低，而束徑係依 中央毛簇、中間毛簇以及外側毛簇之順序依次擴大之牙 刷；其中，該中央毛藤以及中間毛簇的束徑係較最外側列 之外側毛族的束徑還細且δ玄中央毛鎮以及中間毛籍的毛長 係較前述外側毛箱的毛長還高。依據此牙刷可獲得優異的 清掃實感以及向口腔内之間隙的插入實感。 在專利文獻4則提議有下述的牙刷：將植毛面區劃為平 行牙刷軸向方向之3mm寬的中央帶狀區域與位於此中央帶 狀區域兩側之一雙外側區域，使中央帶狀區域之中央主鬃 毛(bristle)的高度高於外側區域之外側主鬃毛的高度且使 中央主鬃毛全體的硬度大於外側主鬃毛全體的硬度。依據 此牙刷可效率佳地刷掃齒間部。 或者，提議有使用將牙刷用毛的毛尖尖銳化，即使用 所謂的錐化毛之牙刷。 201210530 例如，在專利文獻5則提議有下述的牙刷：將經錐化之 針狀的毛形成為較其他部位之針狀毛的高度還高1mm〜 10mm之突出部。依據此牙刷，針狀的毛因應需要可局部 地、集中地穿透牙齒之間隙部或牙周袋等牙齒週邊之細緻 的部位而容易地除去食物渣滓。 又，在專利文獻6〜7則提議有下述的牙刷：植設有毛 長不同之毛束且將構成前述毛束之鬃毛的尖端部作成錐化 狀者。依據此牙刷可獲得優異的刷掃實感以及向口腔内之 間隙的插入實感。 先行技術文獻 專利文獻 專利文獻1特開2007-229065號公報 專利文獻2特開2008-154808號公報 專利文獻3日本國特許第3583346號公報 專利文獻4日本國特許第4076403號公報 專利文獻5特開2002-85159號公報 專利文獻6日本國特許第358581 1號公報 專利文獻7特開2001-346632號公報 L發明内容3 發明概要 發明所欲解決的課題 可是，要是罹患牙周病，為了避免刷掃時的疼痛或出 血等則有喜好盡可能不會帶給牙齦刺激觸感之牙刷的傾 向。而為了不帶給牙齦刺激，一般來說或使用牙刷用毛直 201210530 . 徑經細化之柔和的牙刷用毛、或使用所謂剛度（毛腰）低的牙 刷用毛、或提高牙刷用毛的植毛密度而分散刷掃壓力。 另一方面，要是使用剛度低的牙刷用毛則牙垢的除去 易變得不充分；要是提高牙刷用毛的植毛密度則變得會限 制用以使毛尖進入牙齒與牙齦間的間隙所必須之各毛束的 活動。這般的牙刷不能滿足為牙周病對東之根本課題的「齒 頸部的清掃性」。對牙周病患者而言，係尋求一邊帶來不會 對牙齦加諸負擔的安心感，一邊可適當地清掃齒頸部的牙 刷。 此外，上述專利文獻1〜7的牙刷，係從有效率地除去 牙垢之觀點而成之發明，對牙周病患者之關心卻係不充分。 ' 於是，本發明之目的係提供可兼容對牙齦溫和的觸感 —以及齒頸部之高清掃性的牙刷。 用以解決課題的手段 本發明者等人深入探討的結果，獲得下述的知識：由 於位置於植毛面寬度方向外側之毛束易於接觸牙齦，而藉 由緩解該毛束對牙齦造成之壓力，而可實現對牙齦之溫和 觸感。此外，發現藉由使位置於植毛面大致中央之毛束的 植毛密度與位置於植毛面外側之毛束的植毛密度在一定的 範圍，而可兼容對牙齦的溫和觸感以及齒頸部之清掃性， 而至完成本發明。 即，本發明之牙刷係具備於前端設有頭部的握持件且 形成於前述頭部植毛面之2個以上的植毛穴中植設有牙刷 用毛毛束的牙刷，其特徵在於前述植毛面具備有中央毛束 7 201210530 群與一雙之外側毛束蛘，該中央毛束群係並設在前述握持 件之軸線方向且係由位置於前述植毛面大致中央之2以上 的中央毛束而成者；該—雙之外側毛束群則係由在垂直前 述握持件軸線之方向上挾著前述中央毛束群所植設之2以 上的外側毛束而成者；將由連結位置於前述中央毛束群最 外周之前述中央毛束所植設之前述植毛穴外緣的環狀線所 包圍之區域當作中央植毛區域，而將構成前述中央毛束群 之牙刷用毛總根數除以前述中央植毛區域的面積所得之値 當作中央植毛密度，將由連結位置於前述外側毛束群其中 一者最外周之前述外側毛束所植設之前述植毛穴外緣的環 狀線所包圍之區域當作第一外側植毛區域，將由連結位置 於另一前述外側毛束群最外周之前述外側毛束所植設之前 述植毛穴外緣之環狀線所包圍之區域當作第二外側植毛區 域’將構成前述-雙外側毛束群之牙毛總根數除以前 述第-外側植毛區域面積與前述第二外側植毛區域面積之 和所得之値當作外繼毛密度，而以外廳毛密度/中央植 毛密度所表示之植毛密度比為丨6〜6 〇。 剛述中央毛束在垂直其長度方向之截面的直徑為 〜L6mm ’且將垂直前述外側毛束長度方向之前述外側毛 束的截面積除以垂直前述中央毛束長度方向之前述中央毛 束=截面積所得之値以1>8以上為佳；較佳係前述中央毛束 在則述植毛面上之長度係長於前述外側毛束在前述植毛面 上，長度，更佳係、前述中央毛束以及前述外側毛束之兩者 或疋任者，含有朝向毛尖其徑逐漸變小之牙刷用毛。 201210530 發明効果 依據本發明之牙刷，在頭部 與:雙T卜側毛束群’該中央毛束群係並設二 方向且係由位置於前述植毛面大致中央之以上的中央毛 束所成者，而該—雙之外側毛束群係由在垂直前述握持件 轴線方向上挾著前述中央毛束群所植設之以上的外側也 束所成者’將由連結位置於前述巾央毛束群最外周之前述 中央毛束所植設之前述植毛穴外緣的環狀線所包圍之區域 ‘作中央植毛區域，而將由構成前述中央毛束群之牙刷用 毛總根數除以前述中央植毛區域的面積所得之値當作中央 植毛密度，而將由連結位置於前述外側毛束群其中一者最 外周之前述外側毛束所植設之前述植毛穴外緣的環狀線所 包圍之區域當作第一外側植毛區域，將由連結位置於另一 前述外側毛束群最外周之前述外側毛束所植設之前述植毛 穴外緣的環狀線所包圍之區域當作第二外側植毛區域，將 構成前述一雙外側毛束群之牙刷用毛總根數除以前述第一 外側植毛區域之面積與前述第二外側植毛區域之面積的和 所得之値當作外側植毛密度，由於以外側植毛密度/中央植 毛密度所表示之植毛密度比為1.6〜6.0,而可兼容對牙齦之 溫和觸感與齒頸部之高清掃性。 依據本發明之牙刷，由於前述中央毛束在垂直其長度 方向之截面的直徑為1.0〜1.6mm，且將垂直前述外側毛束 長度方向之前述外側毛束截面積除以垂直前述中央毛束長 度方向之前述中央毛束的截面積所得之値為L8以上’而可 201210530 使對牙齦之觸感更良好並且可更提升齒頸部之清掃性。 依據本發明之牙刷，由於前述中央毛束在前述植毛面 上之長度係作成長於前述外側毛束在前述植毛面上之長 度，前述中央毛束之前端變得易於進入牙周袋或齒間部而 可進一步提升齒頸部之清掃性。 由於在前述中央毛束以及前述外側毛束兩者或是任一 者係包含有朝向毛尖牙刷用毛直徑逐漸變小之牙刷用毛， 而構成前述中央毛束或是前述外側毛束之牙刷用毛前端變 得易於進入牙周袋或齒間部，可進一步提升齒頸部的清掃 性。 圖式簡單說明 第1A圖係顯示本發明一實施形態之牙刷頭部的平面 圖。 第1B圖係顯示本發明一實施形態之牙刷頭部的側面 圖。 第2圖係於第1A圖及第1B圖之牙刷所使用之牙刷用毛 的側面圖。 C實施方式3 較佳實施例之詳細說明 用以實施發明的形態 針對本發明之牙刷，在以下參照圖式進行説明。第1A 圖係顯示有關本發明一實施形態之牙刷1之頭部的平面 圖；第1B圖係有關本發明一實施形態之牙刷1頭部之側面 圖。 10 201210530 如於第1A圖以及第⑺圖所示般，牙刷i具備握持件2， ^持件2則雜略地由長尺狀之握持部（未顯示於圖）與設於 前述握持部前端之頭部4所構成者。第1A圖中，符號〇係握 持件2之軸線，即，在握持件2之長度方向上且通過握持件2 之中心的線。 將軸線Ο方向當作長向之平面視圖下，頭部4大致係矩 形，將任意面當作植毛毛束之植毛面5。在植毛面5，在轴 線Ο上且沿著軸線〇 ’交錯狀地形成有2 3個有底圓筒狀之中 央植毛穴1G’在此2個以上中央植毛穴1()植設大致圓柱狀地 捆束2以上之中央牙刷用毛13而成中央毛束12而構成中央 毛束群14。 又，在植毛面5，在其寬度方向，即垂直轴線〇之方向 上挾著中央植毛穴10,沿軸線〇形成有12個有底圓筒狀之外 側植毛穴2 0 ’在此外側植毛穴2 〇植設大致圓柱狀地捆束2以 上之外側牙刷用毛23而成外侧毛束22。然後，在植毛面5， 由沿頭部4之側緣6所設之6個外側毛束2 2構成第一外側毛 束群24a，而由沿頭部4之側緣7所設之6個外側毛束22構成 第二外側毛束群24b。 為中央毛束12在植毛面5上之長度的毛長ti係作成長 於為外側毛束22在植毛面5上之長度的毛長t2者。 在植毛面5形成有中央植毛區域η,該中央植毛區域係 顯示設有中央毛束群14之區域’中央植毛區域丨丨係以連結 置於中央毛束群14最外周之中央毛束12所植設之中央植 毛八1〇外緣之環狀線所包圍之區域。尚且，此環狀線構成 201210530 隣接的中央植毛穴ι〇彼此之共通接線。 在植毛面5，形成有第一外側植毛區域21 a，該第一外 側植毛區域顯示設有第一外側毛束群24a之區域，第一外側 植毛區域21a係以連結構成第一外側毛束群24a之外側毛束 22所植設的外側植毛穴20外緣的環狀線所包圍之區域。 尚且，此環狀線係構成在第一外側毛束群24a内瞵接之 外側植毛穴20彼此的共通接線。 又’在植毛面5形成有第二外側植毛區域2ib，該第二 外側植毛區域係顯示設有第二外側毛束群24b之區域，第二 外側植毛區域21 b係以連結構成第二外側毛束群24b之外側 毛束22所植設之外側植毛穴20外緣的環狀線所包圍之區 域。尚且，此環狀線係構成在第二外側毛束群24b内隣接之 外側植毛穴20彼此的共通接線。 握持件2的材質’可考慮牙刷1所要求之剛性或機械特 性等來決定’例如’藉由使用撓曲模數(JIS K7203)在500 〜3000MPa範圍的高硬度樹脂’可獲得對牙刷丨係必要之機 械特性。這般的高硬度樹脂，例如可舉：聚丙稀(pp)、聚 對笨二甲酸乙二酯（PET)、聚對苯二甲酸環已二曱酯 (PCT)、聚苯乙_(ps)、丙烯腈-丁二豨-苯乙烯(ABS)、丙酸 纖維素(CP)、聚芳香酯、聚碳酸酯以及丙稀腈_苯乙稀(as) 等，可使用此等之1種或2種以上。 頭部4之大小可考慮於口腔内的操作性等來決定，例 如，寬度W作成10〜15mm、厚度T作成4〜8mm。 中央植毛六10之直徑R1係可因應中央毛束12之直徑， 12 201210530 . 即，垂直中央毛束12長度方向之截面的直徑來決定，例如， 作成1.0〜1.6mm。在本實施形態中，全部的中央植毛穴1〇 之直徑R1係作成大致相等。大致相等係指稱全部的直徑111 係包含於±5%之範圍内。 又，外側植毛穴20之直徑R2係可因應外側毛束22之直 徑來決定，例如，作成1.8〜2.4mm。在本實施形態中，全 部的外側植毛穴20之直徑R2係作成大致相等。大致相等係 指稱全部的直徑R2係包含於±5%之範圍内。 在第1A圖，中央植毛穴10之數量為23個，但本發明並 不限於此。中央植毛穴10之數量可因應植毛面的形狀來決 定，以18〜28個為佳。 又，在第1A圖，外側植毛穴20之數量為12個，但本發 • 明並不限於此。外側植毛穴20之數量係可因應植毛面的形 狀來決定，以8〜16個為佳。 中央毛束12之毛長ti可考慮中央牙刷用毛13之材質及 粗細等來決定，例如，作成6〜15mm。 中央毛束12之毛束徑ri，即，垂直中央毛束12長度方 向之截面的直徑，並無特別限定，以1.0〜1.6mm為佳、1.2 〜1.4mm為更佳。要是中央毛束12之毛束徑rl為1.0mm以 上，則作為中央毛束12之剛度會變高而齒頸部之清掃性會 提升’要是為1.6mm以下則中央毛束12之尖端部變得易於 侵入牙周袋或齒間部等之微細部分而清掃性提升。 在本實施形態，全部的中央毛束12之毛束徑rl係作成 大致相等。大致相等係指稱全部的直徑rl係包含於±5%之範 13 201210530 圍内。 對每1個中央毛束12之中央牙刷用毛13的根數可考慮 中央牙刷用毛13之牙刷用毛徑等來決定 ，例如，作成1 〇 30根。 尚且，中央毛束12之毛束徑ri係在與植毛面5之邊界部 伤上之直徑，並與中央植毛穴1〇之直徑幻大致相等。大致 相等係指稱差異在±5%内。 中央毛束群14之植毛密度，即，構成中央毛束群14之 中央牙刷用毛13的總根數除以中央植毛區域11之面積所得 之値（中央植毛密度）係無特別限定，例如，以4〜11根/mm2 為佳、以6〜9根/mm2為佳。要是中央植毛密度未滿4根/mm2 則在刷掃時中央毛束14彼此無法相互地支撐變為低剛度而 齒頸部之清掃性降低。要是中央植毛密度超過11根/mm2， 則在刷掃時，隣接之中央毛束14彼此的干擾變大，中央毛 束14之彎曲等的活動被過度地抑制，而妨礙中央牙刷用毛 13往齒頸部的侵入。 如第2圖所示般，中央牙刷用毛13係大致圓柱狀且其尖 端部係從基部13b朝向前端13a直徑逐漸變小’為所謂的錐 化毛。 中央牙刷用毛13之材質無特別限定’例如’可使用： 6-12耐綸及6-10耐綸等之聚醯胺；PET、聚對笨二曱酸丁二 酯（PBT)以及聚對笨二曱酸丙二酯（PTT)等之聚酯；pp等之 聚烯烴；還有烯烴系彈性體及苯乙烯系彈性體等之合成樹 脂材料。又，亦可將2以上之此等樹脂材料組合使用，例如， 14 201210530 « . 亦可如芯㈣造等般在芯部與勒部使用不同樹脂材料β 中央牙刷用毛13之牙刷用毛徑可考慮中央牙刷用毛ΐ3 之材質等來決定，例如，作成6〜 ^⑽㈣刪⑹㈣簡脑)。為如⑽上的話確保可良 好地清掃齒頸部之剛度，為9mil以下的話確保可緩解對 牙齦等之刺激的柔軟性。尚且，錐化毛之牙刷用毛徑係即 將朝向前端13a直徑逐漸變小時之直徑，即尖端部之基部 13b之直徑。 外側毛束22在植毛面5上的長度，即毛長^係可考慮外 側牙刷用毛23之材質及粗細等來決定，例如，作成6〜 13mm 〇 以下述（1)式所表示之中央毛束12之毛長ti與外側毛束22 之毛長t2間的毛長差t3，以〇.3mm以上2_0mm以下為佳、以 0-5〜l_5mm為較佳。tl>t2的話，可圖謀齒頸部之清掃性以 及對牙齦之觸感更進一步的提升。 毛長差t3(mm)=毛長tl(mm)-毛長t2(mm) · · · (1) 外側毛束22之毛束徑r2,即，垂直外側毛束22長度方 向之截面的直徑，以1.8〜2.4mm為佳、以2.0〜2.2mm為較 佳。要是外側毛束22之毛束徑r2未滿1.8mm，則在刷掃時， 無法分散從外側毛束22前端往牙齦加諸之壓力，對牙齦之 刺激變強而對牙齦之觸感降低。要是外側毛束22之毛束徑 r2超過2.4mm，則外側牙刷用毛23與同樣構成外側毛束22 之其他的外側牙刷用毛23間的干擾變得過大，損及活動的 自由度，而降低溫和的觸感。 15 201210530 本實施形態，全部的外側毛束22之毛束徑r2係作成A 致相等。大致相等係指稱全部的直徑r2係包含於±5%之料 内。 對每1個外側毛束22之外側牙刷用毛23的根數，<考慮 外側牙刷用毛23之牙刷用毛徑等來決定’例如’作成50〜 200根。 尚且，外側毛束22之毛束徑r2係在與植毛面5之邊界部份 上的直徑，且大致相等於外側植毛穴20之直徑R2。 以[外側毛束截面積]/[中央毛束截面積]所表示之毛束 截面積比係垂直外側毛束22長度方向之截面積（外側毛束 截面積）與垂直中央毛束12長度方向之截面積（中央毛束截 面積）之比率，該毛束截面積比以1.8以上為佳、以1.8〜5.0 為較佳 '以2.5〜4.0為最佳。要是為1.8以上則外側毛束22 之毛束徑不會變得過小，可充分地分散從外側毛束22的前 端往牙齦加諸之壓力而觸感提升。又，中央毛束12之毛束 徑不會變得過大，中央毛束12之尖端部變得易於進入牙周 袋或齒間部而齒頸部之清掃性提升。要是為5.0以下則中央 毛束12之毛束徑與外側毛束22之毛束徑相比不會變得過 小，中央毛束12之剛度變高而齒頸部之清掃性提升。又， 外側毛束22不會變得過大，而因頭部放大造成之操作性以 及頭部的強度提升。 尚且’中央毛束截面積係中央毛束12與植毛面5之邊界 部份的截面積，與中央植毛穴10之開口面積大致相等。外 側毛束截面積係外側毛束2 2與植毛面之邊界部份的截面 16 201210530 , 積，與外側植毛穴20之開口面積大致相等。 第一外側毛束群24a之植毛密度，即，將構成第一外側 毛束群24a之外側牙刷用毛23之總根數除以第一外側植毛 區域21a之面積所得之値，以1〇根/mm2以上為佳、以15根 /mm2以上為較佳。要是第一外側毛束群24a之植毛密度未滿 10根/mm2，則在刷掃時變得難以分散從外侧毛束22之前端 往牙齦加諸之壓力。 第二外側毛束群24b之植毛密度，即，將構成第二外側 毛束群2 4 b之外側牙刷用毛2 3總根數除以第二外側植毛區 域21b之面積所得之値係與第一外側毛束群24a之植毛密度 係同樣的。 第一外側毛束群24a之植毛密度與第二外側毛束群24b • 之植毛密度可相同亦可不同。不過，從在刷掃時對口腔内 上下左右任一牙齦皆確保溫和的觸感的觀點來看，第一外 側毛束群24a之植毛密度與第二外側毛束群24b之植毛密 度，係以大致相等為佳。尚且，大致相等係意指以[第—外 側毛束群之植毛密度]/[第二外側毛束群之植毛密度]所表 示之比為0.95〜1.05。 構成第二外側毛束群24b之外側牙刷用毛23的總根數 與構成第-外側毛束群24a之㈣牙刷用毛23的總根 同樣的。 構成第-外側毛束群2 4 a之外側牙毛2 3的總根數 與構成第二㈣毛束群24b之外崎_毛23的總根數可 為相同亦可為不同。不過，從在刷掃時對口腔内上下左右 17 201210530 任一牙齦皆確保溫和的觸感的觀點來看，構成第一外側毛 束群24a之外側牙刷用毛23總根數與構成第二外側毛束群 24b之外側牙刷用毛23總根數以大致相等為佳。 尚且，大致相等係意指以[構成第一外側毛束群之外側 牙刷用毛總根數]/[構成第二外側毛束群之外側牙刷用毛總 根數]所表示之比為0.95〜1.05。 將構成第一外側毛束群24a之外側牙刷用毛23的總根 數與構成第二外側毛束群2 4 b之外側牙刷用毛2 3的總根數 之和除以第一外側植毛區域2la之面積與第二外側植毛區 域21b之面積的和所得之値（外側植毛密度）係，例如，以 根/mm2以上為佳、以15根/mm2以上為較佳。要是外側植毛 密度未滿10根/mm2則在刷掃時會變得難以分散從外側毛束 22之前端往牙齦加諸之壓力。 以[外側植毛密度]/[中央植毛密度]所表示之植毛密度 比，係1_6〜6.0、以1_8〜4.0為佳、以2.0〜3.5為較佳。要是 植毛岔度比為1_6以上，則因外側毛束群之壓力分散降低而 造成溫和的觸感提升，而因中央毛束之密度過高而造成齒 頸部之清知性提升。要是植毛密度比為6.〇以下，則中央毛 束群14之剛度變高而齒頸部之清掃性提升。即，在上述範 圍内的sir，可圖谋兼谷對牙齦之溫和觸感與齒頸部之良好 的清掃性。 外側牙刷用毛23係與中央牙刷用毛丨3同樣，其尖端部 係朝向前端直徑逐漸變小的錐化毛。 外側牙刷用毛23之材質係與中央牙刷用毛13之材質相 201210530 同。 尚且’中央牙刷用毛13之材質與外側牙刷用毛23之材 質，可為相同亦可為不同。 外側牙刷用毛23之牙刷用毛徑，可考慮外側牙刷用毛 23之材質等來決定，例如，作成4〜7mn。為4mil以上的話， 可獲得充分的自立性，為7mil以下的話可充分地缓解對牙 齦的刺激。 此外’外側牙刷用毛23之牙刷用毛徑以較中央牙刷用 毛13之牙刷用毛徑還小為佳。藉由作成這樣的構成，在刷 掃中一面可因易於接觸牙齦之外側牙刷用毛23而緩解對牙 齦的刺激’一面可因中央牙刷用毛13而提升齒頸部之清掃 性。 本發明之牙刷1的製造方法，可使用習知已知的方法， 例如，可舉將牙刷用毛對折並藉由將挾入在其間之平線打 入植毛穴而植設毛束之平線式植毛、將毛束之下端壓入將 成為植毛部的溶融樹脂中來固定的熱熔接法，或是加熱毛 束下端而形成熔融塊後往模具中注入熔融樹脂來成形植毛 部之模内處理法(in-mold process)等。 依據本貫施形態，在植毛面大致中央設有中央毛束 群，並且在中央毛束群兩側設有一雙的外側毛束群，且由 於植毛密度比係作成1.6〜6.0，在刷掃時，植毛密度高之外 側毛束群接觸牙齦並帶給柔和的觸感，並且因構成植毛密 度低之中央毛束群的中央牙刷用毛而可良好地清掃齒頸 部。此係由於將在刷掃時易於接觸牙齦之外側毛束群作成 19 201210530 高植毛密度，從外側毛束之前端往牙齦加諸之壓力被分 散，因而緩解對牙齦的刺激。 此外，由於中央毛束群係作成比外側毛束群植毛密度 低者，確保各個中央牙刷用毛活動的自由度，中央牙刷用 毛容易地進入牙周袋或齒間部而可良好地清掃齒頸部。進 一步，由於中央牙刷用毛之活動可適度地由一雙之外側毛 束群所控制，中央牙刷用毛確保對除去牙垢所必須的剛度 而可良好地清掃齒頸部。 依據本實施形態，由於中央毛束係作成較外側毛束還 長之毛長，變得易於進入牙周袋或齒間部，而可進一步提 升齒頸部之清掃性。 依據本實施形態，由於中央牙刷用毛及外側牙刷用毛 係作成錐化毛，中央牙刷用毛或外側牙刷用毛易於進入牙 周袋或齒間部，而可進一步提升齒頸部之清掃性。 本發明並不被上述實施形態所限定。在上述之實施形 態，中央毛束係作成大致圓柱狀，例如，在平面視圖糖圓 形之楕圓柱狀亦可、亦可係平面視圖三角形、四邊形以及 五邊形等之多角柱狀。尚且，將中央毛束作成大致圓柱狀 以外之形狀的狀況時，將外接於平面視圖之形狀的正圓 (perfect circle)之直徑當作其毛束徑。 又，外側毛束係與中央毛束同樣地，係平面視圖橢圓 形之楕圓柱狀亦可，亦可係平面視圖三角形、四邊形以及 五邊形等之多角柱狀。 在上述之實施形態，中央植毛穴係作成有底圓筒狀， 20 201210530 ί 中央植毛穴之形狀可因應中央毛束之形狀來決定，例如， 使中央植毛穴為平面視圖橢圓形之有底筒狀亦可，亦可為 平面視圖三角形、四邊形以及五邊形等之有底多角筒狀等。 又，外側植毛穴係與中央植毛穴同樣地，為平面視圖 橢圓形之有底筒狀亦可，亦可為平面視圖三角形、四邊形 及五邊形等之有底多角筒狀等。 於上述實施形態’全部的中央植毛穴之直徑係作成大 致相等，但本發明並不限定於此，全部的中央植毛穴之直 徑，相互地不同亦可，一部分中央植毛穴的直徑與其他中 央植毛穴的直徑不同亦可。 又’在上述實施形態’係將全部的外側植毛穴之直徑 作成大致相等，但本發明並不限定於此，全部的外側植毛 穴之直徑相互地不同亦可，一部份外側植毛穴的直徑與其 他外側植毛穴的直徑不同亦可。 在上述實施形態’中央牙刷用毛係作成錐化毛，但本 發明並不限定於此，例如’中央牙刷用毛在其長度方向整 個為均一直徑者亦可’前端作成半球面或是平行植毛面之 面亦可。不過’從使易於進入牙周袋或齒間部之觀點來看， 以中央毛束一部份的中央牙刷用毛為錐化毛為佳’以中央 毛束全部的中央牙刷用毛為錐化毛為較佳。 又，外側牙刷用毛係與中央牙刷用毛同樣，於其長度 方向整個係均一之直徑者亦可，前端作成半球面或平行植 毛面之面亦可。不過’從使對牙齦之觸感為溫和者的觀點 看來，以外側毛束一部份之外側牙刷用毛為錐化毛為佳’ 21 201210530 以外側毛束全部的外側牙刷用毛為錐化毛為較佳。 此外，亦可使中央牙刷用毛或是外側牙刷用毛之任一 者以錐化毛構成。 在上述實施形態’中央牙刷用毛及外側牙刷用毛係作 成大致圓柱狀之錐化毛，中央牙刷用毛及外側牙刷用毛係 平面視圖橢圓形之槽圓柱狀、平面視圖三角形、四邊形以 及五邊形等之多角柱狀等亦可。尚且，當中央牙刷用毛或 是外側牙刷用毛係大致圓柱狀以外之形狀的狀況時，係將 外接於其平面視圖之形狀之正圓的直徑當作其牙刷用毛 徑。 在上述實施形態’雖然中央毛束之毛長係作成較外側 毛束之毛長還長，但例如，中央毛束之毛長與外側毛束之 毛長相同，即，毛長差為〇mm亦可，中央毛束之毛長較外 側毛束之毛長還短亦可。又，亦可以使連結此毛束之前端 的形狀成為在握持件之軸線方向上重覆山部與谷部的凹凸 面的方式來設定中央毛束及外側毛束之毛長。 不過，從使齒頸部之清掃良好地進行之觀點來看，令 央毛束之毛長以長於外側毛束之毛長為佳。 在上述實施形態，中央毛束群係中央毛束被交錯狀地 植设’但例如，中央毛束係被格子狀地植設亦可。又，中 央毛束群係由23個中央毛束所構成，但構成中央毛束群之 中央毛束之數量為22個以下亦可，為24個以上亦可。 在上述實施形態，第一或是第二外側毛束群，係由6個 外側毛束所構成，但例如，構成第一或是第二外側毛束群 22 201210530 4 . 之外側毛束為5個以下亦可、為7個以上亦可。 又’構成第一外側毛束群之外側毛束之數量與構成第 二外側毛束群之外側毛束之數量相同亦可，不同亦可。 在土述實施形態’第-及第二外側毛束群係將外側毛 束呈i列地並設於婦件的⑽方向，但本發龍不限定於 此，例如，第-或第二外側毛束群，係將外側毛束格子狀、 交錯狀地植設亦可。不過，從使構成第一及第二外側毛束 群之外側毛束的毛束徑盡可能地大並使提升對牙齦的觸感 的觀點來看，第一及第二外側毛束群係以將外側毛束呈1列 地並設在握持件之軸線方向為佳。 在上述實施形態’外側毛束係植設在中央植毛區域外 側，但外側毛束係挾著中央毛束而植設的話即可，例如， 其之一部份位置於中央植毛區域内亦可。 在上述實施形態，全部的中央毛束之毛束徑係作成大 致相等’但例如’中央毛束之毛束徑相互地不同亦可。不 過’從適當地控制中央毛束之剛度之觀點來看，以全部的 中央毛束之毛束徑大致相等為佳。 又，在上述實施形態，全部的外側毛束之毛束徑係作 成大致相等，但例如，外側毛束之毛束徑係相互地不同亦 可。不過，從使由外側毛束前端往牙齦加諸之壓力藉各外 側毛束成為均一，以及使外側毛束群全體的觸感係溫和的 觀點來看，以全部的外側毛束之毛束徑係大致相等為佳。 實施例 (評價方法） 23 201210530 針對各例的牙刷以下述方法來評價觸感與齒頸部之清 掃性。尚且，齒頸部之清掃性係藉由「齒頸部插入實感; 以及「齒頸部清掃實感」來評價。 」 〈觸感的評價> 觸感係意見評論員10人使用各例的牙刷，將對牙齦的 觸感依下述評價基準來評價。意見評論員10人的平均分數 為2.5分以上當作「A」、平均分數2騎以上未滿2 5分當作 「B」、平均分數1.5分以上未滿2 〇分當作「c」而平均分數 未滿1.5分當作「〇」。 《評價基準》 3分.無牙齦疼痛且觸感非常好。 2分：無牙齦疼痛且觸感好。 1为·於牙銀感到微弱的疼痛。 〇分：於牙齦感到強烈的疼痛。 <齒頸部插入實感的評價> 齒頸部插入實感係意見評論員10人使用各例的牙刷， 將往齒頸部之插入實感依下述評價基準來評價。意見評論 員10人之平均分數為2.5分以上當作「A」、平均分數2.0分以 上未滿2_5分當作「B」、平均分數丨5分以上未滿2.〇分當作 「C」而平均分數未滿ι·5分當作「d」。 《評價基準》 3分：非常地感受到毛尖到達牙齒與牙齦之間隙的感覺。 2分：感受到毛尖到達牙齒與牙齦之間隙的感覺。 1分：不太感受到毛尖到達牙齒與牙齦之間隙的感覺。 24 201210530 〇點：感受不到毛尖到達牙齒與牙齦之間隙的感覺。 <齒頸部清掃實感的評價> 齒頸部清掃實感係意見評論員ίο人使用各例的牙刷， 將齒頸部清掃實感依下述評價基準來評價。意見評論員 人平均分數為2.5分以上當作「Α」、平均分數2〇分以上未滿 2.5分當作「Β」、平均分數1.5分以上未滿2 〇分當作「c」而 平均分數未滿1.5分當作「D」。 《評價基準》 3分：非常地感受到牙齒與牙齦之間隙的污垢掉落的残覺。 2分：感受到牙齒與牙銀之間隙的污垢掉落的感覺。 1分：不太感受到牙齒與牙齦之間隙的污垢掉落的感覺。 〇分：感受不到牙齒與牙齦之間隙的污垢掉落的感覺。 (實施例1〜5、比較例1〜2) 依照顯示於表1的做法，與第1Α圖及第1β圖之牙刷1同 樣地製作植設有錐化毛(ΡΒΤ製）的牙刷。此牙刷係具備中央 毛束群與-雙外側毛束群·，該中央毛束群係由交錯狀地植 設之中央毛束而成者’該-雙外側毛束群係由挾著中央毛 束群之外側毛束而成者。第一外側毛束群與第二外側毛束 群係各自以同數量的外側毛束所構成者。 表中’「每-中央毛束之中央牙刷用毛數量」係指構成 1個中央毛束之中央牙刷用毛之數量，「每—外側毛束之外 側牙刷用毛數量」係指構成1個外側毛束之外側牙刷用毛之 數量。關於外側毛束群之做㈣合敎料—外側毛束= 及第二外側毛束群。 25 201210530 針對所獲得之各例的牙刷評價觸感、齒頸部插入實感 以及齒頸部清掃實感，將該結果顯示於表1。 26 201210530 【ιί 比較例 CN (N (Ν 一 (Ν 1 384 1 1 70.0 | in fN 〇 <Ν ο <Ν 1 10.5 1 ο 180 1 1 2160 | | 65.0 I 33.2 00 (N < U u — (N (N CN ν£> 寸 1 1058 | 1 72.9 I 14.5 j (Ν 〇 (Ν Ο (Ν 10_5 tn i 106 1272 70.9 17.9 00 CN <N u u u 實施例 in On <N 〇 Ο 11.5 m (Ν (Ν L638」 75.2」 00 CN 〇 (Ν Ο (Ν 1 10.5 I ο 守 1 280 1 | 3360 | I 70.9 | 47.4 Ο ^· < CQ ω 寸 m <N <N (Ν 守 (Ν 551 72.9 I <5 oo *T) ^Τ) 1 10.5 I | 1008 | 59.5 16.9 (N oi 03 CQ ω m m (N (Ν «ο 卜 寸 (Ν ^52 172.9 I VO 卜· 对 00 00 1 10.5 I •o 卜· 对 868 67.0 13.0 rn ri 卜 CQ < < (N ON (N Ο Ο 11.5 ν〇 1 464 | 1 75·2 1 (N (Ν (Ν fN (Ν (Ν 105 1 130 1 1 1560 | 78.5 19.9 00 寸 CN m < m < 一 CN (Ν (Ν in 寸 (Ν — 55—2」 | 72.9」 VO 一 (Ν 20 1 Ο <Ν | 10.5 | ό vd 106 1272 70.9 17.9 00 <N 寸 (N < < < 中央毛束之數量（根） 中央植毛穴之直徑（mm) 中央毛束之毛束徑（mm) 中央毛束之毛長（mm) 中央牙刷用毛之牙刷用毛徑（mil) 每一中央毛束之_央牙刷用毛數量（根） 中央牙刷用毛總根數（根） <N ε 旦 無 \S 皱 \hD μ? 趔 -δ- /•—V n B E 軚 Μ 外側毛束之數量（根） 外側植毛穴之直徑（mm) 外側毛束之毛束徑（mm) 外側毛束之毛長（mm) 外側牙刷用毛之牙刷用毛徑（mil) 每一外側毛束之外側牙刷用毛數量（根） 外侧牙刷用毛總根數（根） B vS 皙 \21) § 外側毛束群之植毛密度（根/mm2) 毛束截面積比 植毛密度比 觸感 齒頸部插入實感 齒頸部清掃實感 中央毛束群 外側毛束群 結果 201210530 如於表1顯示般，應用本發明之實施例1〜5任一者之觸 感、齒頸部插入實感以及齒頸部清掃實感的評價皆係「A」 或是「B」。另一方面，植毛密度比為12之比較例1，觸感' 齒頸部插入實感以及齒頸部清掃實感的評價為rC」。又， 植毛密度比為6.1之比較例2，雖說觸感之評價為「a」，齒 頸部插入實感及齒頸部清掃實感之評價卻為rc」。 從此結果，了解到由於應用本發明，可圖謀兼容對牙齦 之溫和的觸感以及齒頸部之清掃性。 産業上之可利用性 依據本發明’可提供使兼容有對牙齦之溫和的觸感以 及齒頸部之高清掃性的牙刷。 【囫式簡單說明】 第1A圖係顯示本發明—實施形態之牙刷頭部的平面 圖。 第1B圖係顯示本發明一實施形態之牙刷頭部的側面 圖。 第2圖係於第1A®及第糊之牙刷所使狀牙刷用毛 的側面圖。 【主要元件符號說明】 卜··牙刷 2…握持件 4…頭部 5…植毛面 6、7···側緣 10…中央植毛穴 11…中央植毛區域 12…中央毛束 13…中央牙刷用毛 13a…前端 13b…基部 14…中央毛束群 20···外側植毛穴 21a···第一外側植毛區域 21b···第二外側植毛區域 22…外側毛束 28 201210530 _ 23···外側牙刷用毛 24a…第一外側毛束群 24b…第二外側毛束群 Ο…轴線 IU、R2…直徑 rl、r2···毛束徑 T…厚度 tl、t2···毛長 t3…毛長差 W…寬度 29201210530 VI. Description of the Invention: [Technical Field of the Invention] Field of the Invention The present invention relates to a toothbrush. The present application claims priority to Japanese Patent Application No. 2010-177779, the entire disclosure of which is incorporated herein by reference. C ^tr Background of the Invention In the toothbrush which is an in-oral cleaning device, in order to improve the tartar removal effect which is the most essential function, the arrangement of the hair bundles of the bundled toothbrush has been made up to now. What is known is the arrangement of the tufts in a basic toothbrush, in which the bundles of uniform diameter are arranged in a lattice or staggered manner. In recent years, due to the improvement of hygiene intentions, in the toothbrush, the tartar removal effect is required to be further improved. For such a demand, it is proposed to combine a toothbrush having different diameters of hair bundles, or a combination of hair bundles having different hair lengths. Made into a toothbrush. For example, 'Patent Document 1 proposes a toothbrush having a front end side hair planting region and a rear end side hair planting region' and a planting density of the front end side planting region toward the rear end side hair planting region; wherein the front end side The hair-planting region is provided with a large-diameter hair bundle substantially U-shaped along the periphery of the hair-planting surface at the front end of the head, and a small-diameter hair bundle is disposed at the rear end of the head. According to this toothbrush, it is possible to obtain a brushing force in each part of the oral cavity, in particular, a high occlusal surface of the white tooth. 4 201210530 Further, in Patent Document 2, there is proposed a toothbrush having a central hair bundle row and an outer hair bundle column 'and a total area of the planting hairs of the central hair bundle column and a total area of the planting hairs of the outer hair bundle column. The ratio system is 1: 0.6~1: 2.8, in which the central tufts are arranged in the center along the direction of the head, and the hairs in the inner diameter of 2_0~2.8mm are planted with 屌|J hair, while the outer hair bundle The column is provided with bristles on both outer sides of the central bristle bundle column at an inner diameter of 1 · 2 to 1 · 6 mm. According to this toothbrush, the tartar which is located in the detail of the tooth surface, the tooth neck, and the interdental portion can be efficiently swept. Patent Document 3 proposes a toothbrush in which the center thief and the middle tuft of the toothbrush are disposed on the inner side of the outer tuft, and the central hairy hair has the highest hair length and the hair length of the outer hair column. a toothbrush which is sequentially lowered in the order of the central tuft, the middle tuft, and the outer tuft; wherein the diameter of the central moth and the middle tuft is larger than that of the outermost column The beam diameter is also fine and the hair length of the δ Xuan central Mao town and the middle Mao nationality is higher than that of the aforementioned outer hair box. According to this toothbrush, an excellent cleaning feeling and an insertion feeling into the gap in the oral cavity can be obtained. Patent Document 4 proposes a toothbrush in which the hair-planting surface is divided into a central strip-shaped region of 3 mm wide in the axial direction of the parallel toothbrush and a double outer region on one side of the central strip-shaped region to make the central strip-shaped region The height of the central main bristle is higher than the height of the main main bristles outside the outer region and the hardness of the central main bristles is greater than the hardness of the outer main bristles. According to this toothbrush, the interdental portion can be brushed efficiently. Alternatively, it is proposed to use a toothbrush that sharpens the tip of the toothbrush, i.e., a so-called tapered hairbrush. 201210530 For example, Patent Document 5 proposes a toothbrush in which the tapered needle-like hair is formed to be a protrusion higher than the height of the needle-like hair of the other portion by 1 mm to 10 mm. According to this toothbrush, the needle-like hair can be easily removed from the food residue by locally and intensively penetrating the fine portion of the periphery of the tooth such as the gap portion of the tooth or the periodontal pocket. Further, in Patent Documents 6 to 7, there is proposed a toothbrush in which a hair bundle having a different hair length is planted and a tip end portion of the bristles constituting the hair bundle is tapered. According to this toothbrush, excellent brushing real feeling and insertion into the gap in the oral cavity can be obtained. Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Japanese Patent Publication No. JP-A No. 358581 No. PCT No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. When the pain or bleeding occurs, there is a tendency to prefer not to give the gums a toothbrush that stimulates the touch. In order to not stimulate the gums, generally use a toothbrush with a straight hair 201210530. Use a soft toothbrush with a finer hair, or use a toothbrush with a so-called stiffness (hair waist), or improve the hair of the toothbrush. The density of the hair is spread and the brush sweeps the pressure. On the other hand, if a toothbrush with a low rigidity is used, the removal of tartar may become insufficient; if the density of the hair of the toothbrush is increased, it becomes necessary to limit the gap between the tooth and the gum. Hair bundle activity. Such a toothbrush cannot satisfy the "cleaning property of the tooth neck" which is the fundamental problem of periodontal disease to the east. For patients with periodontal disease, it is desirable to clean the dental brush of the tooth neck while providing a sense of relief that does not burden the gums. Further, the toothbrushes of the above Patent Documents 1 to 7 are invented from the viewpoint of efficiently removing tartar, and the concern for patients with periodontal disease is insufficient. Thus, it is an object of the present invention to provide a toothbrush that is compatible with the gentle touch of the gums, as well as the high-definition sweep of the tooth neck. Means for Solving the Problems As a result of intensive investigation by the present inventors, the following knowledge is obtained: since the hair bundle positioned outside the width direction of the hair-planting surface is easy to contact the gums, and by relieving the pressure of the hair bundle on the gums, It can achieve a gentle touch on the gums. In addition, it has been found that by making the hair density of the hair bundle located substantially at the center of the hair-planting surface and the hair density of the hair bundle positioned outside the hair-planting surface within a certain range, it is compatible with the gentle touch of the gums and the cleaning of the tooth neck. Sexuality, and the completion of the present invention. In other words, the toothbrush of the present invention is provided with a toothbrush in which a hairbrush for hairbrush is formed in two or more planting pockets of the head hair-planting surface, and the hair-planting surface is provided. The central hair bundle 7 201210530 group and a pair of outer hair bundles are arranged, and the central hair bundle group is disposed in the axial direction of the holding member and is a central hair bundle which is located at a position substantially above the center of the hair-planting surface. The double outer group of hair bundles is formed by two or more outer hair bundles planted in the direction perpendicular to the axis of the grip member, adjacent to the central bundle of hair bundles; The area surrounded by the annular line of the outer edge of the planting hole implanted by the central tuft at the outermost circumference of the central tuft group is regarded as a central planting area, and the total number of hairs for the toothbrush constituting the central tuft group is The enthalpy obtained by dividing the area of the central hair-planting area as the central planting density is to be an annular line of the outer edge of the aforementioned hair-planting hole which is implanted by the outer hair bundle at the outermost periphery of one of the outer hair bundle groups. package The surrounding area is regarded as the first outer hair-planting area, and the area surrounded by the annular line of the outer edge of the hair-growing hole of the outer hair bundle which is connected to the outermost circumference of the outermost hair bundle group is regarded as the second The outer hair-planting region' is obtained by dividing the total number of teeth of the above-mentioned double lateral hair bundle group by the sum of the area of the aforementioned first-outer hair-planting region and the area of the second outer hair-planting region as the external hair density. The planting density ratio represented by the hall hair density/central planting density is 丨6~6 〇. Just as the diameter of the cross section of the central tuft in the longitudinal direction thereof is 〜L6 mm′ and the cross-sectional area of the outer tufts perpendicular to the longitudinal direction of the outer tuft is divided by the central tuft of the longitudinal direction of the central tuft= Preferably, the enthalpy of the cross-sectional area is 1> or more; preferably, the length of the central hair bundle on the planting surface is longer than the length of the outer hair bundle on the hair-planting surface, the length, and more preferably, the central tuft And both of the outer hair bundles or the bristles, the toothbrush for the toothbrush having a diameter which gradually decreases toward the tip of the hair. 201210530 EFFECT OF THE INVENTION According to the toothbrush of the present invention, the central hair bundle group of the head and the double-twisted hair bundle group is formed in two directions and is formed by a central tuft which is located substantially above the center of the hair-planting surface. And the pair of outer hair bundles are bundled by the outer side of the above-mentioned central bundle of hair bundles in the direction perpendicular to the axis of the gripper, and will be connected by the joint position. The area surrounded by the annular line of the outer edge of the aforementioned planting hole, which is implanted in the outermost circumference of the tuft of the tufts, is the central planting area, and the total number of hairs of the toothbrush constituting the central tuft group is divided by The area of the central hair-planting area is obtained as a central planting density, and is surrounded by an annular line connecting the outer edges of the hair-growing points of the outer hair bundle of the outermost circumference of one of the outer hair bundle groups. The region is regarded as the first outer hair-planting region, and the region surrounded by the annular line of the outer edge of the hair-growing hole implanted by the outer hair bundle at the outermost circumference of the other outer hair bundle group is regarded as the second a lateral planting area, wherein the total number of hairs of the toothbrush constituting the pair of outer hair bundles is divided by the sum of the area of the first outer hair-planting region and the area of the second outer hair-planting region as the outer planting density, Since the planting density ratio represented by the outer planting density/central planting density is 1.6 to 6.0, it is compatible with the gentle touch of the gums and the high-definition property of the tooth neck. According to the toothbrush of the present invention, since the diameter of the cross section of the central tuft in the longitudinal direction thereof is 1.0 to 1.6 mm, and the cross-sectional area of the outer hair bundle perpendicular to the longitudinal direction of the outer tuft is divided by the length of the central tuft The enthalpy of the cross-sectional area of the central hair bundle in the direction is L8 or more', and 201210530 makes the touch feeling to the gums better and can improve the cleaning property of the tooth neck. According to the toothbrush of the present invention, since the length of the central tuft on the flocking surface is increased by the length of the outer tuft on the flocking surface, the front end of the central tuft becomes easy to enter the periodontal pocket or the interdental portion. The cleaning of the tooth neck can be further improved. The toothbrush for the center hair bundle or the outer hair bundle is included in the center tuft and the outer hair bundle, and the toothbrush for the hairbrush is gradually reduced in diameter. The front end of the hair becomes easy to enter the periodontal pocket or the interdental portion, which further improves the cleaning property of the tooth neck. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a plan view showing a toothbrush head according to an embodiment of the present invention. Fig. 1B is a side view showing a toothbrush head according to an embodiment of the present invention. Fig. 2 is a side view of the toothbrush for the toothbrush used in the toothbrushes of Figs. 1A and 1B. C. Embodiment 3 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Mode for Carrying Out the Invention A toothbrush according to the present invention will be described below with reference to the drawings. Fig. 1A is a plan view showing the head of the toothbrush 1 according to an embodiment of the present invention; and Fig. 1B is a side view showing the head of the toothbrush 1 according to an embodiment of the present invention. 10 201210530 As shown in Fig. 1A and Fig. 7 (7), the toothbrush i is provided with the grip member 2, and the holder 2 is roughly provided by a long-sized grip portion (not shown) and provided in the aforementioned grip. The head 4 of the front end of the holding portion is formed. In Fig. 1A, the symbol is the axis of the grip 2, i.e., the line in the longitudinal direction of the grip 2 and passing through the center of the grip 2. The direction of the axis Ο is taken as a plan view of the long direction, and the head 4 is roughly rectangular, and any face is regarded as the hair-growing face 5 of the hair bundle. In the hair-growing surface 5, there are 23 bottom-shaped cylindrical central planting holes 1G' on the axis Ο and along the axis 〇', and more than two central planting holes 1 () are planted in a substantially cylindrical shape. The central toothbrush hairs 13 are bundled into two or more central hair bundles 12 to form a central hair bundle group 14. Further, in the hair-growing surface 5, the central planting hole 10 is placed in the direction of the width direction, that is, the direction of the vertical axis ,, and 12 bottomed cylindrical outer side hair-planting holes are formed along the axis 2 2 0 ' The hairs 2 are planted in a substantially cylindrical shape, and 2 or more outer toothbrush hairs 23 are formed into outer hair bundles 22. Then, on the hair-growing surface 5, the first outer tufts 24a are formed by the six outer tufts 2 2 provided along the side edges 6 of the head 4, and the six outer bundles 24a are provided along the side edges 7 of the head 4. The outer tuft 22 constitutes a second outer tuft group 24b. The length br of the length of the central tuft 12 on the hair-growing surface 5 is increased to the length t2 of the length of the outer tuft 22 on the hair-growing surface 5. A central hair-planting region η is formed on the hair-growing surface 5, and the central hair-planting region is a region in which a central hair-planting region is provided to connect the central hair-bringing region 14 to connect the central hair bundle 12 placed at the outermost periphery of the central hair bundle group 14. The area surrounded by the circular line of the outer edge of the planting plant. Moreover, this loop line constitutes the common wiring of the adjacent central planting pockets of 201210530. In the hair-growing surface 5, a first outer hair-planting region 21a is formed, the first outer hair-planting region showing a region in which the first outer hair-blowing group 24a is provided, and the first outer hair-planting region 21a is connected to constitute the first outer hair-blowing group The area surrounded by the annular line of the outer edge of the outer planting hole 20 implanted by the outer side tuft 22 of 24a. Further, the loop line constitutes a common wiring between the outer planting holes 20 which are spliced in the first outer bristle bundle group 24a. Further, a second outer hair-planting region 2ib is formed on the hair-growing surface 5, the second outer hair-planting region is a region in which the second outer hair-blowing group 24b is provided, and the second outer hair-planting region 21b is connected to constitute a second outer hair. The outer bundle of hair bundles 22b is surrounded by a ring line surrounded by the outer edge of the outer edge of the hair follicle 20. Further, the loop line constitutes a common wiring between the outer planting holes 20 adjacent to each other in the second outer bristle bundle group 24b. The material of the grip member 2 can be determined by considering the rigidity or mechanical properties required for the toothbrush 1, for example, by using a high hardness resin in the range of 500 to 3000 MPa using a flexural modulus (JIS K7203). The necessary mechanical properties. Such high hardness resins include, for example, polypropylene (pp), polyethylene terephthalate (PET), poly(ethylene terephthalate) (PCT), and polystyrene (PS). , acrylonitrile-butadiene-styrene (ABS), cellulose propionate (CP), polyarylate, polycarbonate, and acrylonitrile- styrene (as), etc., may be used or 2 or more types. The size of the head portion 4 can be determined in consideration of the operability in the oral cavity, etc., for example, the width W is made 10 to 15 mm, and the thickness T is made 4 to 8 mm. The diameter R1 of the central hair graft 6 can be determined according to the diameter of the central tuft 12, 12 201210530. That is, the diameter of the cross section of the vertical central tuft 12 in the longitudinal direction is determined, for example, 1.0 to 1.6 mm. In the present embodiment, the diameters R1 of all the central planting pockets 1 are made substantially equal. Substantially equal means that all diameters 111 are included in the range of ± 5%. Further, the diameter R2 of the outer planting hole 20 can be determined in accordance with the diameter of the outer tuft 22, for example, 1.8 to 2.4 mm. In the present embodiment, the diameter R2 of all the outer planting holes 20 is made substantially equal. Substantially equivalent All diameters R2 are referred to within ±5%. In Fig. 1A, the number of central planting pockets 10 is 23, but the present invention is not limited thereto. The number of central planting hairs 10 can be determined according to the shape of the hair-planting surface, preferably 18 to 28. Further, in Fig. 1A, the number of the outer planting holes 20 is twelve, but the present invention is not limited thereto. The number of lateral planting pores 20 can be determined according to the shape of the hair-planting surface, preferably 8 to 16. The hair length ti of the center tuft 12 can be determined in consideration of the material and thickness of the center toothbrush 13 and is, for example, 6 to 15 mm. The diameter of the hair bundle diameter ri of the center tuft 12, that is, the diameter of the cross section of the vertical center tuft 12 is not particularly limited, and is preferably 1.0 to 1.6 mm, more preferably 1.2 to 1.4 mm. If the hair bundle diameter rl of the center tuft 12 is 1.0 mm or more, the rigidity of the center tuft 12 will become high and the cleaning property of the tooth neck will be improved. If it is 1.6 mm or less, the tip end portion of the center tuft 12 becomes It is easy to invade the minute portion of the periodontal pocket or the interdental portion, and the cleaning property is improved. In the present embodiment, the hair bundle diameters rl of all the central tufts 12 are made substantially equal. Substantially equal means that all diameters rl are included in the range of ± 5% of the range 20121030. The number of the central toothbrush hairs 13 for each of the central hair bundles 12 can be determined by the diameter of the toothbrush of the central toothbrush 13 or the like, for example, 1 to 30. Further, the hair bundle diameter ri of the central tuft 12 is the diameter of the injury to the boundary portion of the hair-planting surface 5, and is approximately equal to the diameter of the central planting haircup. Substantially equal means that the difference is within ±5%. The planting density of the central tuft group 14, that is, the total number of the central toothbrush hairs 13 constituting the central tuft group 14 divided by the area of the central tufting region 11 (the central planting density) is not particularly limited, for example, It is preferably 4 to 11 pieces/mm 2 and preferably 6 to 9 pieces/mm 2 . If the central planting density is less than 4/mm2, the central tufts 14 cannot support each other at the time of brushing to become low rigidity and the cleaning property of the tooth neck is lowered. If the central planting density exceeds 11 pieces/mm2, the interference between the adjacent central tufts 14 becomes large at the time of brushing, and the movement of the central tufts 14 and the like is excessively suppressed, and the central toothbrush is prevented from being smeared 13 Invasion of the tooth neck. As shown in Fig. 2, the central toothbrush hair 13 is substantially cylindrical and its tip end portion is gradually reduced in diameter from the base portion 13b toward the distal end 13a, which is a so-called tapered hair. The material of the central toothbrush 13 is not particularly limited. For example, it can be used: 6-12 nylon and 6-10 nylon, etc.; PET, polybutylene dibenzoate (PBT) and poly pair A polyester such as styrene diacetate (PTT); a polyolefin such as pp; and a synthetic resin material such as an olefin elastomer or a styrene elastomer. Further, it is also possible to use two or more of these resin materials in combination, for example, 14 201210530 « . It is also possible to use different resin materials in the core and the part as the core (four), etc. It is conceivable that the central toothbrush is determined by the material of the bristles 3, for example, 6 to ^(10)(4), (6), and (4). In the case of (10), it is ensured that the rigidity of the tooth neck can be cleaned well, and if it is 9 mil or less, it is ensured that the softness to the stimulation of the gums and the like can be alleviated. Further, the tooth diameter of the toothed toothbrush of the tapered hair is a diameter which gradually becomes smaller toward the front end 13a, that is, the diameter of the base portion 13b of the tip end portion. The length of the outer tuft 22 on the hair-growing surface 5, that is, the length of the hair, can be determined in consideration of the material and thickness of the outer toothbrush 23, for example, 6 to 13 mm, and the central hair represented by the following formula (1) The hair length difference t3 between the hair length ti of the bundle 12 and the hair length t2 of the outer hair bundle 22 is preferably 33 mm or more and 2_0 mm or less, and preferably 0-5 〜 l_5 mm. When tl>t2, the cleaning of the tooth neck and the touch of the gums can be further improved. Hair length difference t3 (mm) = hair length tl (mm) - hair length t2 (mm) · · · (1) The hair bundle diameter r2 of the outer hair bundle 22, that is, the diameter of the cross section of the longitudinal outer hair bundle 22 in the longitudinal direction Preferably, it is preferably 1.8 to 2.4 mm and preferably 2.0 to 2.2 mm. If the hair bundle diameter r2 of the outer tufts 22 is less than 1.8 mm, the pressure applied to the gums from the front end of the outer tufts 22 cannot be dispersed during the brushing, and the stimulation of the gums becomes strong and the touch to the gums is lowered. If the hair bundle diameter r2 of the outer hair bundle 22 exceeds 2.4 mm, the interference between the outer toothbrush hairs 23 and the other outer toothbrush hairs 23 which also constitute the outer hair bundle 22 becomes excessively large, and the degree of freedom of movement is impaired. Reduces the gentle touch. 15 201210530 In the present embodiment, the hair bundle diameters r2 of all the outer hair bundles 22 are made equal. Substantially equal means that all diameters r2 are contained within ±5% of the material. The number of the hairbrush 23 for the outer side of each of the outer hair bundles 22, < Considering that the toothbrush for the outer toothbrush 23 is determined by the diameter of the toothbrush or the like, for example, 50 to 200 pieces are formed. Further, the hair bundle diameter r2 of the outer tuft 22 is a diameter on the boundary portion with the hair-planting surface 5, and is substantially equal to the diameter R2 of the outer tufting hole 20. The cross-sectional area of the bundle of hair bundles indicated by the [outer bundle cross-sectional area] / [central bundle cross-sectional area] is the cross-sectional area of the longitudinal outer bundle 22 in the longitudinal direction (outer bundle cross-sectional area) and the length of the vertical center tuft 12 The ratio of the cross-sectional area (the cross-sectional area of the central hair bundle) is preferably 1.8 or more, and preferably 1.8 to 5.0, preferably 2.5 to 4.0. If it is 1.8 or more, the hair bundle diameter of the outer tufts 22 does not become too small, and the pressure applied from the front end of the outer tufts 22 to the gums can be sufficiently dispersed to improve the touch. Further, the hair bundle diameter of the center tuft 12 does not become excessively large, and the tip end portion of the center tuft 12 is easily inserted into the periodontal pocket or the interdental portion, and the cleaning property of the tooth neck is improved. If it is 5.0 or less, the hair bundle diameter of the center tuft 12 does not become too small as compared with the tuft diameter of the outer tuft 22, the rigidity of the center tuft 12 becomes high, and the cleaning property of the tooth neck is improved. Further, the outer tufts 22 do not become excessively large, and the operability due to the enlargement of the head and the strength of the head are improved. Further, the cross-sectional area of the boundary portion between the central tuft 12 and the flocked surface 5 is substantially equal to the opening area of the central planting hole 10. The cross-sectional area of the outer hair bundle is the cross-section of the boundary portion between the outer hair bundle 2 2 and the hair-planting surface 16 201210530 , and the opening area of the outer hair-planting hole 20 is substantially equal. The planting density of the first outer bristle bundle group 24a, that is, the total number of the outer toothbrush hairs 23 constituting the outer side of the first outer bristle bundle group 24a is divided by the area of the first outer tufting region 21a, It is preferably /mm2 or more, and preferably 15 pieces/mm2 or more. If the planting density of the first outer bristle bundle group 24a is less than 10/mm2, it becomes difficult to disperse the pressure applied from the front end of the outer tuft 22 to the gums during the brushing. The planting density of the second outer bristle bundle group 24b, that is, the total number of the outer toothbrushes 2 3 b of the outer brush bundle group 2 4 b divided by the area of the second outer tufting region 21b The planting density of an outer bristle bundle 24a is the same. The planting density of the first outer bristle bundle group 24a may be the same as or different from the tufting density of the second outer bristle bundle group 24b. However, from the viewpoint of ensuring a gentle touch to any of the upper and lower gingiva in the oral cavity during brushing, the planting density of the first outer bristle bundle group 24a and the planting density of the second outer bristle bundle group 24b are It is roughly equal. Further, roughly equal means that the ratio expressed by [planting density of the outer hair bundle group] / [planting density of the second outer hair bundle group] is 0.95 to 1.05. The total number of the outer toothbrush hairs 23 constituting the second outer hair bundle group 24b is the same as the total root of the (four) toothbrush hairs 23 constituting the first outer hair bundle group 24a. The total number of the outer bristles 23 constituting the first outer bristle bundle group 2 4 a and the total number of outer spurs 23 constituting the second (four) bristle bundle group 24b may be the same or different. However, from the viewpoint of ensuring a gentle touch to any of the upper and lower left and right sides of the mouth, 20121030, during the brushing, the total number of the hairbrushes 23 on the outer side of the first outer hair bundle group 24a constitutes the second outer side. It is preferable that the total number of the hairbrushes 23 on the outer side of the tuft group 24b is substantially equal. In addition, roughly equal means that the ratio of [the total number of hairs for the toothbrush outside the first outer bundle group] / [the total number of hairs of the toothbrush outside the second outer bundle group] is 0.95~ 1.05. The sum of the total number of the toothbrush hairs 23 constituting the outer side of the first outer hair bundle group 24a and the total number of the hairbrush hairs 2 3 constituting the outer side of the second outer hair bundle group 24b is divided by the first outer hair-planting area The enthalpy (outer planting density) obtained by the sum of the area of the 2a outer hair-planting region 21b is preferably, for example, root/mm2 or more, and preferably 15 pieces/mm2 or more. If the density of the outer planting hair is less than 10 pieces/mm2, it becomes difficult to disperse the pressure applied to the gums from the front end of the outer hair bundle 22 during brushing. The planting density ratio expressed by [outer planting density] / [central planting density] is preferably from 1 to 6 to 6.0, preferably from 1 to 8 to 4.0, and preferably from 2.0 to 3.5. If the planting twist ratio is 1_6 or more, the pressure distribution of the outer hair bundle group is lowered to cause a mild touch, and the density of the central hair bundle is too high, resulting in a clear improvement of the tooth neck. If the planting density ratio is 6. 〇 or less, the rigidity of the central tuft group 14 becomes high and the cleaning property of the tooth neck is improved. That is, sir in the above range can be used to map the gentle touch of the gums to the good cleaning property of the tooth neck. Similarly to the central toothbrush burrs 3, the outer toothbrush hairs 23 have taper hairs whose tip end portion gradually decreases toward the tip end. The material of the outer toothbrush hair 23 is the same as that of the central toothbrush hair 13 201210530. Further, the material of the central toothbrush 13 and the outer toothbrush 23 may be the same or different. The hair diameter of the toothbrush for the outer toothbrush 23 can be determined in consideration of the material of the outer toothbrush 23, for example, 4 to 7 mn. If it is 4 mil or more, sufficient self-standing property can be obtained, and if it is 7 mil or less, the stimulation of the gums can be sufficiently alleviated. Further, it is preferable that the tooth diameter of the toothbrush for the outer toothbrush 23 is smaller than the diameter of the toothbrush for the toothbrush 13 for the center toothbrush. With such a configuration, it is possible to improve the cleaning property of the tooth neck by the central toothbrush hair 13 by easily contacting the toothbrush hairs 23 on the outer side of the gum during the brushing. In the method for producing the toothbrush 1 of the present invention, a conventionally known method can be used. For example, a flat-line type hair plant in which a hairbrush is folded in half and a hair bundle is implanted by a flat line which is inserted into the hair-planting hole can be used. a method of heat-sealing in which the lower end of the hair bundle is pressed into a molten resin to be a hair-planting portion, or an in-mold process in which a lower portion of the hair bundle is heated to form a molten mass, and a molten resin is injected into the mold to form a hair-planting portion ( In-mold process) and so on. According to the present embodiment, a central group of hair bundles is arranged substantially at the center of the hair-planting surface, and a pair of outer hair bundle groups are arranged on both sides of the central hair bundle group, and the planting density is 1.6 to 6.0, which is used for brushing. The planting density is high, and the lateral hair bundles contact the gums and give a soft touch, and the toothbrush neck can be well cleaned by the central toothbrush which constitutes the central hair bundle group having a low planting density. This is due to the fact that it is easy to contact the outer bristle bundles during brushing. 19 201210530 High planting density, the pressure from the front end of the outer tuft to the gums is dispersed, thus alleviating the stimulation of the gums. In addition, since the central hair bundle group is made to have a lower planting density than the outer hair bundle group, the degree of freedom of hair movement of each central toothbrush is ensured, and the central toothbrush easily enters the periodontal pocket or the interdental portion to clean the teeth well. neck. Further, since the central toothbrush is moderately controlled by a pair of outer hair bundles, the central toothbrush uses a hair to ensure the rigidity necessary for removing the tartar, and the tooth neck can be well cleaned. According to this embodiment, since the central tuft is made longer than the outer tuft, it is easy to enter the periodontal pocket or the interdental portion, and the cleaning property of the tooth neck can be further improved. According to the present embodiment, since the central toothbrush and the outer toothbrush are used as the tapered hair, the central toothbrush or the outer toothbrush can easily enter the periodontal pocket or the interdental portion, thereby further improving the cleaning property of the tooth neck. . The present invention is not limited to the above embodiments. In the above embodiment, the central tufts are formed in a substantially cylindrical shape, for example, a cylindrical shape in a plan view of a sugar circle, or a polygonal column shape such as a plan view triangle, a quadrangle, and a pentagon. Further, when the central tuft is formed into a shape other than a substantially cylindrical shape, the diameter of a perfect circle circumscribing the shape of the plan view is taken as the bundle diameter. Further, the outer tufts are similar to the central tufts, and may have a cylindrical shape in a plan view elliptical shape, or may be a polygonal column shape such as a plan view triangle, a quadrangle, and a pentagon. In the above embodiment, the central planting hole is formed into a bottomed cylindrical shape, and the shape of the central planting hair hole can be determined according to the shape of the central hair bundle, for example, the central planting hair hole is a flat view elliptical bottomed tube. The shape may also be a bottomed polygonal shape such as a plan view triangle, a quadrangle, and a pentagon. Further, the outer planting hairs are similar to the central planting hairs, and may have a bottomed cylindrical shape in a plan view, or a bottomed polygonal tube such as a plan view triangle, a quadrangle, and a pentagon. In the above embodiment, the diameters of all the central planting points are substantially equal. However, the present invention is not limited thereto, and the diameters of all the central planting points may be different from each other, and the diameters of some central planting points and other central plants may be different. The diameter of the hair points can be different. Further, in the above embodiment, the diameters of all the outer planting points are substantially equal. However, the present invention is not limited thereto, and the diameters of all the outer planting holes may be different from each other, and the diameter of a part of the outer planting holes may be different. It is also different from the diameter of other lateral planting points. In the above embodiment, the central toothbrush is made of a tapered hair. However, the present invention is not limited thereto. For example, if the central toothbrush has a uniform diameter throughout its longitudinal direction, the front end may be made into a hemispherical surface or a parallel hair graft. The face can also be. However, from the point of view of easy access to the periodontal pocket or the interdental portion, it is better to use a central toothbrush with a central hairbrush as the tapered hair. The central toothbrush is made of a central toothbrush. Hair is better. Further, the outer toothbrush hairs may be the same as the central toothbrush hair, and may have a uniform diameter throughout the length direction, and the front end may be a hemispherical surface or a parallel hair graft surface. However, from the point of view of the gentleness of the gums, it is better to use the outer toothbrush as the outer hairbrush for the outer hairbrush. 21 201210530 Hair is preferred. Further, the central toothbrush or the outer toothbrush may be made of tapered hair. In the above-described embodiment, the central toothbrush and the outer toothbrush are made into a substantially cylindrical tapered hair, and the central toothbrush and the outer toothbrush are in a plan view, an elliptical groove, a cylindrical shape, a plan view triangle, a quadrangle, and five. It is also possible to have a polygonal column shape such as a side shape. Further, in the case where the central toothbrush is used in the shape of a hair or a shape in which the outer toothbrush has a substantially cylindrical shape, the diameter of the perfect circle which is externally attached to the plan view is taken as the diameter of the toothbrush. In the above embodiment, the hair length of the central hair bundle is longer than the hair length of the outer hair bundle, but for example, the hair length of the central hair bundle is the same as the hair length of the outer hair bundle, that is, the hair length difference is 〇mm Alternatively, the length of the hair of the central tuft may be shorter than the length of the outer tuft. Further, the hair length of the center hair bundle and the outer hair bundle may be set such that the shape of the front end connecting the hair bundles is such that the uneven portions of the mountain portions and the valley portions are overlapped in the axial direction of the grip member. However, from the viewpoint of making the cleaning of the tooth neck well, it is preferable that the hair length of the hair bundle is longer than the hair length of the outer hair bundle. In the above embodiment, the central tufts of the central tufts are interlaced in a staggered manner. However, for example, the central tufts may be implanted in a lattice shape. Further, the central hair bundle group is composed of 23 central hair bundles, but the number of central hair bundles constituting the central hair bundle group may be 22 or less, and may be 24 or more. In the above embodiment, the first or second outer hair bundle group is composed of six outer hair bundles, but for example, the first or second outer hair bundle group 22 201210530 4 . The following may be used, and it may be seven or more. Further, the number of the outer hair bundles constituting the first outer hair bundle group may be the same as the number of the outer hair bundles constituting the second outer hair bundle group, and may be different. In the embodiment of the present invention, the first and second outer hair bundle groups have the outer hair bundles in the i-row direction and are disposed in the (10) direction of the woman, but the hair dragon is not limited thereto, for example, the first or second outer side. In the group of hair bundles, it is also possible to plant the outer hair bundles in a lattice or staggered manner. However, from the viewpoint of making the hair bundle diameters constituting the outer hair bundles of the first and second outer hair bundle groups as large as possible and lifting the touch feeling to the gums, the first and second outer hair bundle groups are It is preferable that the outer tufts are arranged in one row and arranged in the axial direction of the grip member. In the above embodiment, the outer hair bundle is implanted outside the central hair-planting region, but the outer hair bundle may be implanted with the central hair bundle. For example, one of the positions may be located in the central hair-planting region. In the above embodiment, the hair bundle diameters of all the central tufts are made substantially equal. However, for example, the hair bundle diameters of the central tufts may be different from each other. However, from the viewpoint of appropriately controlling the rigidity of the central tuft, it is preferable that the hair bundle diameters of all the central tufts are substantially equal. Further, in the above embodiment, the hair bundle diameters of all the outer hair bundles are made substantially equal, but for example, the hair bundle diameters of the outer hair bundles may be different from each other. However, from the viewpoint that the pressure applied to the gums from the distal end of the outer hair bundle is uniform by the outer hair bundles, and the tactile sensation of the outer hair bundle group is moderate, the hair bundle diameter of all the outer hair bundles is obtained. The system is roughly equal. EXAMPLES (Evaluation Method) 23 201210530 The toothbrush of each example was evaluated for the touch and the cleanability of the tooth neck by the following method. In addition, the cleaning of the tooth neck is evaluated by "the real feeling of the tooth neck insertion" and "the real feeling of the tooth neck cleaning." <Evaluation of the tactile sensation> Ten people of the tactile sensation commentator used the toothbrush of each example, and evaluated the tactile sensation of the gum according to the following evaluation criteria. The average score of 10 commentators is 2.5 points or more as "A", the average score 2 is more than 25 points as "B", and the average score is 1.5 points or more and less than 2 points as "c". The average score is less than 1.5 points as "〇". "Evaluation Criteria" 3 points. There is no gum pain and the touch is very good. 2 points: no gum pain and good touch. 1 is a weak pain in the silver. Score: I feel strong pain in the gums. <Evaluation of the sensation of the insertion of the tooth and the neck> The sensation of the neck and the neck was evaluated by 10 people using the toothbrush of each example, and the feeling of insertion into the tooth neck was evaluated according to the following evaluation criteria. The average score of 10 commentators is 2.5 points or more as "A", the average score of 2.0 points or more is less than 2_5 points as "B", the average score is 5 points or more, and less than 2. The score is regarded as "C" The average score is less than ι·5 as "d". "Evaluation Criteria" 3 points: I feel the feeling that the tip of the hair reaches the gap between the tooth and the gum. 2 points: Feel the feeling that the tip of the hair reaches the gap between the tooth and the gum. 1 point: I don't feel the feeling that the tip of the hair reaches the gap between the teeth and the gums. 24 201210530 〇 Point: I don't feel the feeling that the tip of the hair reaches the gap between the tooth and the gum. <Evaluation of the feeling of the neck and neck cleaning> The neck and the neck were cleaned by the opinion commentator ίο. Using the toothbrush of each example, the tooth neck cleaning feeling was evaluated according to the following evaluation criteria. The average score of the commentator is 2.5 points or more as "Α", the average score of 2 points or more is less than 2.5 points as "Β", the average score is 1.5 points or more, and less than 2 points are regarded as "c" and the average score is Less than 1.5 points is considered as "D". "Evaluation Criteria" 3 points: I feel the residual feeling of the dirt falling between the teeth and the gums. 2 points: Feel the feeling of falling dirt between the teeth and the silver. 1 point: I don't feel the feeling of falling dirt between the teeth and the gums. 〇分: I don’t feel the feeling of falling dirt between the teeth and the gums. (Examples 1 to 5, Comparative Examples 1 and 2) In accordance with the method shown in Table 1, a toothbrush in which taper hair (tanned) was planted was produced in the same manner as the toothbrush 1 of the first and first figures. The toothbrush has a central hair bundle group and a double outer hair bundle group, and the central hair bundle group is formed by a central hair bundle planted in a staggered manner. The double outer hair bundle group is held by the central hair. The outside of the bundle is made up of hair bundles. The first outer tuft group and the second outer tuft group are each formed by the same number of outer tufts. In the table, 'the number of hairs for the central toothbrush of each of the central hair bundles' refers to the number of hairs for the central toothbrush that constitutes one central hair bundle, and the number of hairs for the toothbrush outside the outer hair bundle refers to one. The amount of hair used on the outside of the outer hair bundle. About the outer hair bundle group (4) combined material - outer hair bundle = and the second outer hair bundle group. 25 201210530 For the toothbrushes of each of the obtained examples, the tactile sensation, the tooth-neck insertion feeling, and the tooth-neck cleaning real feeling were evaluated, and the results are shown in Table 1. 26 201210530 【 ιί 比较 比较 CN (N (Ν 1 Ν 1 384 1 1 70.0 | in fN 〇 <Ν ο <Ν 1 10.5 1 ο 180 1 1 2160 | | 65.0 I 33.2 00 (N < U u — (N (N CN ν£> Inch 1 1058 | 1 72.9 I 14.5 j (Ν _ (Ν _ (Ν 10_5 tn i 106 1272 70.9 17.9 00 CN <N u u u Example in On <N 〇 Ο 11.5 m (Ν (Ν L638) 75.2” 00 CN 〇 (Ν 1 (Ν 1 10.5 I ο 守 1 280 1 | 3360 | I 70.9 | 47.4 Ο ^· < CQ ω inch m <N <N (Ν守Ν (Ν 551 72.9 I <5 oo *T) ^Τ) 1 10.5 I | 1008 | 59.5 16.9 (N oi 03 CQ ω mm (N (Ν «ο Bu inch (Ν ^52 172.9 I VO 卜 · 对 00 00 1 10.5 I •o卜· to 868 67.0 13.0 rn ri 卜 CQ << (N ON (N Ο Ο 11.5 ν〇 1 464 | 1 75·2 1 (N (Ν ( 1 fN (Ν ( 1 105 1 130 1 1 1560 | 78.5 19.9 00 inch CN m < m < One CN (Ν (Ν in inch (Ν — 55—2” | 72.9” VO 一 (Ν 20 1 Ο <Ν | 10.5 | ό vd 106 1272 70.9 17.9 00 <N inch (N <<< Number of central hair bundles (root) Diameter of central planting hairs (mm) Hair bundle diameter of central hair bundle (mm) Hair length of central hair bundle (mm) Hair diameter of central toothbrush with hairbrush (mil) per The number of hairs of a central toothbrush (the root) and the total number of hairs of the central toothbrush (root) <N ε 旦 无 \S wrinkle \hD μ? 趔-δ- /•-V n BE 軚Μ Number of lateral hair bundles (root) Diameter of outer planting pores (mm) Hair bundle diameter of outer hair bundles (mm Hair length of the outer hair bundle (mm) Hair diameter of the toothbrush for the outer toothbrush (mil) Number of hairs for the outer toothbrush of each outer hair bundle (root) Number of hairs for the outer toothbrush (root) B vS 皙\ 21) § The hair density of the outer hair bundle group (root/mm2) The cross-sectional area of the hair bundle is smaller than the planting density. The tactile tooth neck is inserted into the real tooth. The neck is cleaned. The central hair bundle group is outside the hair bundle group. 201210530 As shown in Table 1 In general, the evaluation of the tactile sensation, the insertion of the tooth neck, and the real feeling of the tooth neck cleaning using any of the embodiments 1 to 5 of the present invention are "A" or "B". On the other hand, in Comparative Example 1 in which the planting density ratio was 12, the tactile sensation of the tooth neck insertion and the actual feeling of the tooth neck cleaning were rC. Further, in Comparative Example 2 in which the planting density ratio was 6.1, although the evaluation of the tactile sensation was "a", the evaluation of the real feeling of the tooth neck and the actual feeling of the tooth neck cleaning was rc". From this result, it is understood that due to the application of the present invention, the gentle touch to the gums and the cleaning property of the tooth neck can be constrained. Industrial Applicability According to the present invention, it is possible to provide a toothbrush which is compatible with a gentle touch to the gums and a high-definition sweep of the tooth neck. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a plan view showing a toothbrush head of the present invention. Fig. 1B is a side view showing a toothbrush head according to an embodiment of the present invention. Fig. 2 is a side view of the hairbrush for the toothbrush of the 1A® and the paste. [Description of main component symbols] Bu·Toothbrush 2...grip holder 4...head 5...planting surface 6,7···side edge 10...central planting hole 11...central hair-planting area 12...central hair bundle 13...central toothbrush Hair 13a...Front end 13b...Base 14...Central tuft group 20···Outer planting hole 21a···First outer hair-planting area 21b···Second outer hair-planting area 22...Outer hair bundle 28 201210530 _ 23·· The outer toothbrush hair 24a...the first outer hair bundle group 24b...the second outer hair bundle group Ο...the axis IU, R2...the diameter rl, the r2···the hair bundle diameter T...the thickness tl, the t2···the hair length T3...hair length difference W...width 29