201205629 六、發明說明： 【日月戶斤身相々貝】 技術領域 本發明係有關於一種設置成面對行動電話、筆記型電 腦等之電子機器之按鍵基板的開關模組。 【先前^^椅3 背景技術 以往，於行動電話、筆記型電腦等之電子機器會設置 具有按鍵部之按鍵基板，再者，藉由按鍵頂部之接觸、非 接觸而切換電連接之ON、OFF之開關模組係配置成面對按 鍵基板。第5圖係顯示配置成面對具有複數按鍵部7〇之按鍵 基板80的習知開關模組1〇〇之概略立體圖，又，第6圖係顯 示第5圖中圖示的開關模組1〇〇之概略截面圖。 如第6(a)圖所示，於開關模組1〇〇設置有：内含電極55 之金屬彈片50 ;電路基板60 ;導光構件3〇 ;及作為發光元 件之LED(發光二極體，Light Emitting Diode)2〇。金屬彈片 50係藉由金屬彈片薄片40 —體地保持於電路基板60上，導 光構件30係藉由黏著層35，隔著預定間隔而安裝於金屬彈 片薄片40。又，於導光構件30之下面，設置有白色油墨呈 點狀印刷之印刷加工或棱鏡加工等之光散射加工部3〇a，且 於導光構件30與LED20間設置有反射體（反射構件）25，該反 射體25係用以將射出自LED20之光有效地自導光構件3〇之 端部導引至導光構件30内。另，反射體25之端部係延伸至 覆蓋導光構件30之上面之位置。 201205629 若藉由前述構造，則可藉由利用朝下方按壓按鍵部7〇 而使金屬彈片5〇變形來進行的金屬彈片5〇與電極55之電接 觸、非接觸，切換開關之ON、〇FF，同時由於在按鍵基板 80之内面，即’按鍵基板80與金屬彈片薄片4〇間設置導光 構件30，因此，可鞛由光散射加工部3〇a，使射出自LED20 並入射至導光構件3〇内之光散射，藉此，自導光構件3〇内 照明各個按鍵部7〇。另，相關技術係揭示於專利文獻丨至專 利文獻6。 先行技術文獻 專利文獻 專利文獻1 .日本專利公開公報特開2009-246821號公報 專利文獻2 .日本專利公開公報特開2008-152951號公報 專利文獻3 :曰本專利公開公報特開2009-140871號公報 專利文獻4 :日本專利公開公報特開2009-187855號公報 專利文獻5 :日本專利公開公報特開2004-139983號公報 專利文獻6:日本專利公開公報特開2008-226844號公報 C發明内容3 發明概要 發明欲解決之課題 然而，前述習知構造係具有以下課題。 第6(b)圖係以模式方式顯示導光構件30内的光行進方 向。舉例言之，射出自LED20且藉由反射體25自導光構件 30之端部入射至導光構件30内之光係如圖*L1所示之光， —面反覆於導光構件30之上面及下面之反射，一面於導光 4 201205629 構件30内前進。又，如圖中L2所示之光，亦包括藉由光散 射加工部3 0 a散射而朝按鍵部7 0之方向脫離導光構件3 〇之 上面之光(藉由依此散射之光，照明按鍵部7〇)。 然而，入射至導光構件30内之光係存在有以下光，即. 如圖中L3、L4所示之光，雖然未形成光散射加工部3如，作 仍於反射體25之邊緣部附近自導光構件30之上面朝按鍵臬 板80之方向漏出者。其結果，於按鍵基板8〇之表面，备有 L3、L4之光漏出之領域，即，LED20附近之領域相較於其 他領域而極端地過度發光之問題。 另一方面’ 一般會對可照明按鍵部之開關模組要求能 盡量地以均一之亮度照明複數按鍵部之「亮度均一性」。然 而，於前述構造中，為了滿足「亮度均一性」之要求，必 須避免在LED20附近之過度發光領域配置按鍵部70，且必 須將LED20與（最接近LED20)按鍵部70之距離隔開。即，必 須大幅地設定第6(b)圖所示之「距離a」，且無法在LED2〇 附近配置按鍵部70。依此，此會牽涉到按鍵部70之龄寥& 設計上、結構上之制約。即，於習知構造中，無法滿足抑 戏·言十 度均一性之要求且更滿足要緩和按鍵部70之配置么# 上、結構上之制約之要求。 ^ 故，本發明之目的係提供一種開關模組，且該開祕择 組係設置成面對按鍵基板者，又，可減低自反射體I ^ -C I方冓 部附近朝按鍵部之方向漏出的光之光量，並藉由於聲 件内前進的光，均一地照明按鍵部。 用以欲解決課題之手段 201205629 為了達成前述目的，於本發明中，開關模組係設置成 面對具有按鍵部之按鍵基板者，又，包含有：電路基板， 係於面對前述按鍵基板之表面形成電極層者；導光構件， 係設置於前述按鍵基板與前述電路基板間者；光源元件， 係將光射出者；及反射構件，係使射出自前述光源元件之 光自前述導光構件之端部入射至前述導光構件内者；又， 藉由使别述按鍵部相對於前述電極層而移動，切換開關之 ON、OFF，同時可藉由入射至前述導光構件内之光，自前 述導光構件内照明前述按鍵部，其特徵在於：前述導光構 件係具有面對前述按鍵基板之第1面；及位於其相對側而面 對前述電路基板之第2面，且前述反射構件係設置成覆蓋前 述端部中的第1面，同時於前述反射構件設置有光吸收性構 件’且該光吸收性構件係堵塞入射至前述導光構件内並自 前述反射構件之邊緣部附近透過第1面的光之光路。 右·藉由前述構造，則由於在反射構件設置有光吸收性 構件，且該光吸收性構件係堵塞入射至導光構件内並自反 射構件之邊緣部附近透過第丨面的光之光路，因此，藉由利 用光吸收構件來吸收光，可減低自反射構件之邊緣部附近 漏出的光之光量。其結果，即使相對於光源元件而將按鍵 部靠近配置’亦'可避免該按鍵部相較於其他按鍵部而過度 發光之問題，因此，可緩和有關按鍵部配置之設計上、結 構上之制約，同時可滿足亮度均一性之要求。另，由於藉 由光吸收性構件來吸收的光係限定於欲自反射構件之邊緣 部附近漏出的光，因此，幾乎不會有因設置光吸收性構件 201205629 而降低用以照明按鍵部之光量之虞，且能以充分之光量照 明按鍵部。 又，較為理想的是刖述光吸收性構件係具有光吸收性 之/專片材’且包含有：光吸收面，係堵塞自前述反射構件 之邊緣部附近透過第1面的光之光路者；及安裝面，係安裝 於削述反射構件者；又，成形為前述安裝面之面積大於前 述光吸收面之面積。 若藉由前述構造，則由於安裝面之面積大於光吸收面 之面積’因此’容易對反射構件安裝具有光吸收性之薄片 材’同時所安裝的W材不易脫f依此，可提升開關模 組之生產性、耐久性。 又，較為理想的是前述薄片材係安裝於前述反射構件 中與面對前述導光構件之面呈相對側之面。 若藉由前述構造，則由於將薄片材安裝於反射構件中 與面對導光構件之面呈相對側之面，因此，容易對反射構 件安裝薄片材，即，可提升生產性並減低製造成本。舉例 5之，在將薄片材安裝於反射構件中面對導光構件側之面 時，由於會將薄片材安裝於反射構件與導光構件間，因此， 不得不在有限空間内進行安裝作業，且生產性會降低，並 可月b會增加製造成本，然而，於本發明之構造中，容易確 保作業空間，且可輕易地進行薄片材之安裝作業。 又，為了達成前述目的，於本發明中，開關模組係設 置成面對具有按鍵部之按鍵基板者，又，包含有：電路基 板，係於面對前述按鍵基板之表面形成電極層者；導光構 201205629 件，係設置於前述贿基板與前述f路基板間者；光源元 件，係將光射出者；及反射構件，係使射出自前述光源元 件之光自前述導光構件之端部人射至前述^_衫； 又，藉由使前述按鍵部相對於前述電極層而移動，切換開 關之0N、〇FF，同時可藉由入射至前述導光構件内之光， 自前述導光構件内照明前述按㈣，其 光構件係具有面對前述按鍵基板之第1δ;及位於其相對側 而面對前《路基板之第2面，且前述反射構件係設置成覆 蓋前述端部中的第1面’同時於前述反射構件中面對第w 之面’在人射至前述導光構件内並自前述反射構件之邊緣 部附近透過第1面的光之光路上，形成湘光吸收性之油墨 之印刷圖案。 若藉由前述構造’則由於在反射構件中面對第i面之 面於入射至導光構件内並自反射構件之邊緣部附近透過 第1面的光之光路上，形成利用光吸收性之油墨之印刷圖 案’因此’藉由於印刷圖案中吸收光，可減低自反射構件 之邊，彖指近;爲出的光之光量。其結果，即使相對於光源 70件而將㈣部靠近配置’亦可避免該按鍵部相較於其他 按鍵部而過度發叙問題，因此，可緩和有關按鍵部配置 之6又汁上、結構上之制約’同時可滿足亮度均一性之要求。 另’由於藉由利用光吸收性之油墨之印刷圖案來吸收的光 係限定於奴自反射構件之邊緣部附近漏出的光，因此，幾 乎不會有因形成利用光吸收性之油墨之印刷圖案而降低用 以照月按鍵#之光量之虞’且能以充分之光量照明按鍵部。 201205629 又 行可使入射至前 且可藉由於業已施 自前述導光構件内 ，較為理想的是前述導光構件係施 述導光構件内之光散射的光散射加工， 行刖述光散射加工之部分中散射之光， 照明前述按鍵部。 =由前述構造’則可使人射轉光構件内之光散 射，藉此，利用散射光，自導光構件内適當_明按鍵部。 又，較為理想的是前述光散射加工係指將具有光散射 =油墨印刷於前述導光構件之印刷力。工，或將具有光散 射性之二維形狀形成於前述導光構件之二 4 · 一、准形狀加工。 右糟由前述構造，則可藉由簡易之加 、 構件施行光散射加工。另，在此所謂 ^，於導光 例如將白色油墨印刷成點狀之加工，再者，_可列舉如： 可列舉如：藉由模具加卫、雷射加之加1維％狀力0工 光構件形成凹凸、棱鏡等之加工。 方去，於導 又，較為理想的是前述導光構件係使 以上、3。。’以下且具有光透過性之薄片構件。又.、、、1〇0_ 若藉由前述構造，則藉由使用厚度薄且具 之薄片構件’可使開關模組全體小型化，除:之:透過性 介於按鍵部與電極層間之導光構件之厚度薄，因此1於 升使用者在操作按鍵部時傳達給使用者之鍵擊感。，可提 發明效果 ~ 種開關楔 如以上所說明，若藉由本發明，則可提供— 量 組，且該開關模組係設置成面對按鍵基板者，又，可 自反射體之邊緣部附近朝按鍵部之方向漏出的光之光低 201205629 並藉由於導光構件内前進的光，均一地照明按鍵部。 圖式簡單說明 第1(a)至1(c)圖係有關本發明之實施形態的開關模組 之概略截面圖。 第2(a)、2(b)圖係有關本發明之實施形態的開關模組之 概略截面圖。 第3(a)至3(h)圖係有關本發明之實施形態的開關模組 之俯視圖。 第4(a)、4(b)圖係說明有關本發明之實施形態的開關模 組之效果圖。 第5圖係習知開關模組之概略立體圖。' 第6(a)、6(b)圖係習知開關模組之;}既略截面圖。 I：實施方式3 用以實施發明之形態 以下，參照圖式，以例示方式詳細地說明用以實施該 發明之形態。不過，特別是只要沒有特別揭示，於以下實 施形態中所揭示之構成零件之尺寸、材質、形狀、其相對 配置等並非是將該發明之範圍僅限定於該等之旨趣。 〔實施形態〕 <1 :有關開關模組之全體構造> 參照第1(a)圖，說明有關可適用本發明之實施形態的開 關模組1之全體構造。第1(a)圖係有關本實施形態的開關模 組1之概略截面圖。 有關本實施形態的開關模組1係配置成面對具有按鍵 10 201205629 部7之按鍵基板8，且可使用在例如於行動電話、筆記型電 腦等之電子機器中的1〇按鍵基板、（^^灯丫按鍵基板。又， 亦可使用在觸控面板等。 如第1(a)圖所示，開關模組1包含有：LED2，係作為發 光元件者；電路基板6,係具有電極11者；金屬彈片薄片4(電 極層）’係具有覆蓋各個電極11之金屬彈片5者；及導光薄 片3(導光構件），係藉由黏著層10安裝於金屬彈片薄片4上 者。電路基板6可使用FPC基板（撓性印刷電路，Flexible Printed Circuit)。又，於LED2與導光薄片3間設置有反射體 9(反射構件），且該反射體9係使射出自LED2之光有效地自 LED2之端部入射至導光薄片3内，又，反射體9之端部係延 伸至覆蓋導光薄片3端部之上面之位置。 若藉由前述構造’則按鍵頂部7a係朝圖中下方移動而 按壓金屬彈片薄片4，藉此’金屬彈片5會變形，且金屬彈 片5與電極11會接觸’藉此，金屬彈片5與電極11係構成電 連接之狀態，即，開關係自OFF切換成ON之狀態。另，一 般而若由操作性之觀點來看，則開關模組宜作成在按 壓按鍵部時可傳達給使用者充分之鍵擊感，若藉由本實施 形悲’則由於作成藉由具有一定強度之金屬彈片5之變形來 切換開關之ON、OFF，因此，可對使用者傳達充分之鍵擊 感。另，各個金屬彈片5係相對於金屬彈片薄片4而一體地 接著’且於製造過程中’藉由將裝設完金屬彈片5之金屬彈 片薄片4安裝於電路基板6，而可相對於複數電極“，以良 好之精度且藉由簡易之步驟來安裝金屬彈片5。 201205629 <2:有關導光薄片> 說明於本實施形態中所使用的導光薄片3。於本實施形 起中，使用厚度125μηι、蕭氏硬度97且具有光透過性之胺 基曱酸酯橡膠薄片（熱硬化性），然而，可適用作為導光薄片 3之材料並不限於此，亦可使用聚碳酸酯薄膜、矽橡膠薄片 等之透明薄片。又，導光薄片3之厚度並無特殊之限制，然 而，若為厚度1〇〇μιΏ以上、300μίη以下，則可說是更為理想 的。另，在此所謂之「透明薄片」未必係指無色透明，只 要是射出自LED2之光可透過者，則導光薄片3並不限於「無 色透明j。 於本實施形態中，由於依此使用厚度薄之導光薄片3， 因此，可達成開關模組1之小型化，除此之外，更可提升前 述鍵擊感之感度。另，以下，於導光薄片3之表面中，將面 對按鍵基板8側之面（圖中上面）作成「第1面3b」，將面對電 路基板6側之面（圆中下面）作成「第2面3c」來進行說明。 導光薄片3係於第2面3c施行光散射加工，且該光散射 加工係使入射至導光薄片3之光散射’並可藉由散射光（第 1(b)圖中L2之光），自導光薄片3内照明按鍵部7。在此，光 散射加工係藉由喷墨印刷機，施行利用白色油墨（具有光散 射性之油墨）之點印刷（印刷加工）’藉此，於第2面3 c印刷白 點3 a(在此’採用白色油墨作為具有光散射性之油墨’然 而，只要具有光散射性，則亦可使用白色以外之油墨）。白 點3a係分別印刷在對應於按鍵部7之位置’藉此，可藉由白 點3a，使業已自LED2入射玄導光薄片3内之光散射，並藉 12 201205629 由散射光，自導光薄片3内照明按鍵部7。另，白點％之點 被度、形狀等並無特殊之限制，然而，舉例言之藉由於 遠離LED2之領域（光衰減而傳達之領域）增加白點％之點 數，即使是配置在遠離LED2之領域之按鍵部7，亦能以充 分之光量照明。 又，光散射加工之形態並不限於此，亦可為以下形態， 即：將利用模具加卫、雷射加工等之三維形狀加工施行於 預定位置，並於導光薄片3形成凹凸雜、稜鏡形狀者。此 時，亦與白點3a相同，藉由利用業已施行三維形狀加工之 部分使光散射，而可適當地照明按鍵部7。另，印刷加工（白 點3a)係施行於第2面3c,然而，三維形狀加工亦可施行於導 光薄片3之第1面3b。此時，亦可於業已施行於第丨面孙之三 維形狀加工中使光散射，藉此，使光自第丨面补朝按鍵部7 之方向透過’並適當地照明按鍵部7。 <3 :有關反射體> 於本實施形態中，設置有用以使射出自L E D 2之光有效 地自導光薄片3之端部入射至導光薄片3内之反射體9。在如 本實施形態般使用厚度薄之導光薄片3時，導光薄片3之厚 度大多會比LED2之光射出領域寬度薄，此時，亦為了使射 出自LED2之光有效地入射至導光薄片3内，於LED2與導光 薄片3間設置反射體9是有效的。於本實施形態中，為了更 有效地使光入射’於導光薄片3之端部中，反射體9係設置 成覆蓋第1面3b,然而，反射體9之形狀並無特殊之限 又，如圖示，亦可於反射體9與第1面31?間設置預定間隔， 13 201205629 且亦可未設置間隔而使反射體9與第1面3b密接。 <4 :光前進方法> 參照第1(b)圖，說明於本實施形態中的導光薄片3内之 光前進方法。第1(b)圖係針對第l(a)圖所示之開關模組1而 放大LED2附近之概略截面圖。 射出自LED2之光係藉由反射體9，自導光薄片3之端部 入射至導光薄片3内（亦包括未透過反射體9而直接入射至 導光薄片3内之光）。於本實施形態中，導光薄片3之第1面 3b、第2面3c皆與空氣層接連，且由於折射率之差異（若將 空氣層之折射率作成1_〇，則導光薄片3之折射率約丨45)， 因此’於導光薄片3内前進的光係如圖中li、L2，一面反覆 於第1面3b及第2面3c之反射，一面朝導光薄片3之另一端部 前進。又，於其光路上具有白點3a時，於白點知中光會散 射，且如圓中L2所示之光，光會朝按鍵部7之方向脫離導光 薄片3内。另，亦包括在自LED2射出後透過黏著層1〇而入 射至金屬彈片薄片4内之光，然而，該光亦會藉由金屬彈片 5之表面等而反射，並透過黏著層10而再度地入射至導光薄片 3内。 <5 :有關減低漏光之構造> 參照第1(b)、1(c)圖，說明減低被列舉作為習知課題的 「漏光」之構造。第l(c)圖係放大第1(b)圖所示之光u之行 進圖案之圖。 如前所述，於接近LED2之導光薄片3之端部附近，存 在有透過第1面3b之光（第1(b)、1(c)圖之L3之虛線部分），於 201205629 習知構造中，藉由此種光，會產生光自反射體之邊緣部漏 出之現象。故，於本實施形態中，為了解決該課題’ s史置 有黑色薄片12(光吸收性構件），以堵塞自反射體9之邊緣部 附近透過第1面3b的光之光路，並減低漏出光之光量。 更具體而言，於反射體9之上面（與導光薄片3呈相對側 之面）接著黑色薄片12，並使黑色薄片12之端部自反射體9 之邊緣部伸出，以堵塞自反射體9之邊緣部附近透過第1面 3b的光之光路。 右藉由前述構造，則可於黑色薄片12中’吸收自反射 體9之邊緣部漏出的光L3，因此，< 減低自反射體9之邊緣 部漏出的光之光量。另，在此，使用黑色薄片12作為光吸 收性構件，然而，亦可使用黑色以外之薄片材，又，只要 是町適當地吸收光之構件，則亦玎為將薄片材以外之構件 (例如薄膜等）安裝於反射體9之構造。 又’在將黑色薄片12安裝於反射體9之上面時，由於容 易確保安裝作業所需之空間，因此’具有可提升生產性並 減低製造成本之效果。然而，黑色薄片12之安裝處並不限 於此。即’如第2(b)圖所示，亦可將黑色薄片12安裝於反射 體9之下面（配置導光薄片3側）。即使是前述構造，亦可吸收 自反射體9之邊緣部附近漏出的光，因此，可解決迄今之課 題。然而，若由大幅地取得反射體9之有效面積(使用在光 反射中的領域之面積）之觀點來看，則黑色薄片12位於反射 體9之上面者是較為理想的。 又，作為減低漏光之其他構造，如第2(a)圖所示，亦可 15 201205629 心糾第1面31?之面’且 ，即：於屬於反射體9中面對 為以下構这 的光之光路上（堵 广&+辦9之邊緣部附近透過第1面3 為自反射祖 4瘃之印刷圖案13。 你#)，形成利用光吸收性之'/由'少 塞光路之位 6 , g色油墨，然而，亦 ，决吸收性之油墨可列舉如'私& 舉例言之 成印刷圖案13時， ^γ多、琛藏青色等之油墨。又，在形 # 可採F般的喷墨印刷方式、網版印別：出的光。 構造，亦可吸收自反射體9之邊緣部附近扃 <6:有關設置黑色薄片= 第3圖係有 各日3第3圖’說明設置黑色薄片12 爹，，，、 ^技别是以模式方式顯 關本實施形態的開關模組1之俯視圖，特 示設置黑色薄片12之位置圖。 / /稱滿 叛例言之，如第3(a)、3(c)、3(e)圖所 , 冑色薄片12隱藏在反 模植i時，設置黑色薄片12之位置可為黑② M ㈤〃，如第 3(b)、3(d)、 射體9之内側（反射體9之下面）之位置’ 3(f)圖所示，亦可為黑色薄片12朝反射體9之外側（圖中^ 向）伸出之位置。又，如前所述，當黑色薄片12朝反射體9 之外側伸出時，黑色薄片12可設置於反射體9之上面、下面 兩者。另’若將黑色薄片12朝反射體9之外側伸出時之伸出 寬度(於圖中Υ方向中起自反射體9之邊緣部的露出量）作成 「（黑色薄片12之)伸出寬度」，則依據發明人之銳意檢討’ 可知若將「伸出宽度（mm)」作成〇.3mm以上、〇.7mm以下’ 則可更有效地僅吸收構成漏光原因的光。 又，於第3(a)至3(f)圖中的「照光區域」係顯示對應於 按鍵部7之領域，然而，若考慮「照光區域」與LED2之相 16 201205629 對位置關係而決定設置黑色薄片12(或利用黑色油墨之印 刷圖案13)之位置’則是更為有效的。舉例言之，如第3(a)、 3(b)圖’若將黑色薄片12形成為於LED2之正面構成狹縫， 則可抑制「照光區域」之過度發光，並使更多來自LEd2之 光朝圖中下方(Y方向）穿透，因此，即使是位於遠離LED2 之位置之按鍵部7，亦能以充分之光量照明。又，如第3(c)、 3(d)圖’若於LED2之正面安裝黑色薄片12且未設置狹縫， 則可更確實地抑制「照光區域」之過度發光。又，如第3 (e)、 3(f)圖’當LED2之正面具有「照光區域」時，若於LED2之 正面安裝黑色薄片12，則可適當地抑制「照光區域」之過 度發光。即，只要是可以僅吸收自「照光區域」漏出的光 之位置，則黑色薄片丨2之位置可為任何位置。 <7 :有關黑色薄片之形狀> 於本實施形態中，如第3(a)至3(f)圖所示，將黑色薄片 U成形為長方形狀。然而，黑色薄片12之形狀並無特殊之 限制，舉例言之，亦可為如第3(g)、3(h)圖所示般連接面積 相異的二個面之形狀。於本實施形態中的黑色薄片12係成 形為僅吸收自微小區域漏出的光，且亦為了不會吸收其他 光’黑色薄片12大多會成形為微小尺寸。然而，此時，要 以良好之位置精度將黑色薄片12安裝於反射體9會變得困難。 故’如第3(g)、3(h)圖所示，藉由使用以下黑色薄片12， 可改善安裝性’即：藉由連接部12b，連接堵塞光之光路的 光吸收面12a與安裝於反射體9之安裝面12c者。即，在此， 藉由成形為安裝面12c之面積大於光吸收面12a之面積，而 17 201205629 可有效地僅吸收構成吸收對象的光，並容易對反射體9安裝 黑色薄片12。又，不僅提升黑色薄片12之安裝性，且由於 接著面積會增大’因此’黑色薄片12不易脫落，且亦可提 升耐久性。另，如第3 (g)圖所示，光吸收面12a亦可位於遠 離反射體9之邊緣部之位置。 <8 :有關驗證實驗> 分別對（比較例）與（實施例1)至（實施例5)進行以下驗證 實驗，即：驗證可抑制「照光區域」之過度發光之效果者。 以下，參照第4(a)、4(b)圖，說明驗證實驗之條件、結果。 第4(a)圖係顯示於驗證實驗中所使用的「照光區域」（對應 於按鍵部之區域）、LED2之配置之模式圖，第4(b)圖係分別 於（比較例（左）)與（實施例1(右））中所測定的亮度等高線圖 (上側係俯視圖，下側係表現成三維狀之圖）。另，在此，使 用HI-LAND公司製造之RISA-COLOR/ONEII作為亮度測定 用裝置。 (比較例） 作為比較例，於第4(a)圖所示之「照光區域」（按鍵部) 之配置中，針對未於反射體9安裝黑色薄片12之情形，測定 照光區域」之亮度(cd/m2)。依據發明人之銳意檢討，於 圖示之複數「照光區域」中，位於左上與右上之「照光區 域」（以斜線部所示之區域）會產生明顯的「過度發光」現象， 藉此，可確認無法達成到達滿意水準的「亮度均一性」。故， 將位於左上與右上之「照光區域」作為對象，於（比較例） 與（實施例1)至（實施例5)中比較其亮度。另，於（比較例）中， 18 201205629 左上之「照光區域」之亮度係39.6cd/m2，右上之「照光區 域」之亮度係37.2cd/m2，可知若相較於其他「照光區域」 之亮度，則會顯示高亮度，再者，局部地來說，可確認在 左上之「照光區域」中為接近LED2之左上領域，在右上之 「照光區域」中為接近LED2之右上領域會分別極端地過度 發光。 (實施例1) 於實施例1中，如第4(a)圖所示，將黑色薄片12安裝於 反射體9,並將黑色薄片12之「伸出寬度(mm)」作成0.5mm， 將圖中X方向之寬度作成3mm。藉由前述條件測定亮度之結 果，左上之「照光區域」之亮度係21.9cd/m2(於比較例中為 39.6cd/m2)，右上之「照光區域」之亮度係22.9cd/m2(於比 較例中為37.2cd/m2)，可確認會分別大幅度地降低。又，於 其他「照光區域」中，在接近LED2之「照光區域」中亮度 會降低，另一方面，在遠離LED2之「照光區域」中未看見 大幅度之亮度降低。即，可知能抑制「過度發光」，並滿足 「亮度均一性」之要求。 (實施例2) 於實施例2中，將黑色薄片12之「伸出寬度(mm)」作成 0_7mm，且圖中X方向之寬度係作成與實施例1相同（3mm)。 藉由前述條件測定亮度之結果，左上之「照光區域」之亮 度係19.5cd/m2(於比較例中為39.6cd/m2)，右上之「照光區 域」之亮度係20.5cd/m2(於比較例中為37.2cd/m2)，可確認 會分別大幅度地降低。又，於其他「照光區域」中，在接 19 201205629 近LED2之「照光區域」中亮度會降低，另一方面，在遠離 LED2之「照光區域」中未看見大幅度之亮度降低。即，可 知能抑制「過度發光」，並滿足「亮度均一性」之要求。 (實施例3) 於實施例3中，將黑色薄片12之「伸出寬度(mm)」作成 0.1mm，且圖中X方向之寬度係作成與實施例1相同（3mm)。 藉由前述條件測定亮度之結果，左上之「照光區域」之亮 度係38.7cd/m2(於比較例中為39.6cd/m2)，右上之「照光區 域」之亮度係36.2cd/m2(於比較例中為37.2cd/m2) ’可確認 會分別降低。又，於其他「照光區域」中’在接近LED2之 「照光區域」中亮度會降低，另一方面，在遠離LED2之「照 光區域」中未看見大幅度之亮度降低。即，可知能抑制「過 度發光」，並滿足「亮度均一性」之要求。 (實施例4) 於實施例4中，將黑色薄片12之「伸出寬度(mm)」作成 0-3mm’且圖中X方向之寬度係作成與實施例1相同（3mrn)。 藉由前述條件測定亮度之結果，左上之「照光區域」之亮 度係26.0cd/m2(於比較例中為39.6cd/m2)，右上之「照光區 域」之亮度係24.5cd/m2(於比較例中為37.2cd/m2)，可確認 會分別大幅度地降低。又’於其他「照光區域」中，在接 近LED2之「照光區域」中亮度會降低，另一方面，在遠離 LED2之「照光區域」中未看見大幅度之亮度降低。即，叮 知能抑制「過度發光」，並滿足「亮度均一性」之要求。 (實施例5) 20 201205629 於實施例5中，將黑色薄片12之「伸出寬度(mm)」作成 1.0mm’且圖中χ方向之寬度係作成與實施例丨相同（3mm)。 藉由前述條件測定亮度之結果，左上之「照光區域」之亮 度係16.1cd/m2(於比較例中為39 6cd/m2)，右上之「照光區 域」之冗度係17 2ccj/m2(於比較例中為md/m2)，可確認 會分別大幅度地降低。又，於其他「照光區域」中，在接 近LED2之「照光區域」中亮度會降低，另一方面，在遠離 LED2之「照光區域」中未看見大幅度之亮度降低。即，可 知能抑制「過度發光」，並滿足「亮度均一性」之要求。 其次’第4(b)圖係顯示於（比較例）與（實施例1)中的第 4(a)圖之左上之「照光區域」之亮度等高線圖。於第4(b)圖 中’上側所示者係俯視左上之「照光區域」時之亮度等高 線圖’下側所示者係左上之「照光區域」之三維亮度等高 線圖。如圖示’於（比較例）中，可知在「照光區域」全體中 免度高’特別是接近LED2之左上領域會顯示極高之亮度。 相對於此，於(實施例）中，可知在整體上亮度會降低。即， 可知藉由設置黑色薄片12，可確實地抑制「過度發光」。 <9 :有關本實施形態之效果> 若藉由有關本實施形態的開關模組1，則可取得於習知 構造中無法取得之以下效果。 (有關按鍵部配置之設計上、結構上之制約） 若藉由有關本實施形態的開關模組1，則可藉由前述構 造’減低自反射體9之邊緣部附近漏出的光之光量。依此， 於習知構造中，若將按鍵部配置成靠近LED，則會產生位 21 201205629 於LED附近之按鍵部因漏出光而極端地過度發光之問題， 藉此，會產生無法將按鍵部配置成靠近LED之設計上、結 構上之制約’然而’於本實施形態中，即使將按鍵部7配置 成靠近LED2，亦不會產生此種過度發光之問題。依此，可 縮窄第1(b)圖中所示之距離a(最接近LED2之按鍵部7與 LED2之間隔）’即’將按鍵部7配置成靠近LED2，且可緩和 按鍵部配置之設計上、結構上之制約。 (有關亮度均一性） 若藉由本實施形態，則可抑制配置在LED2附近之按鍵 部7相較於其他按鍵部7而極端地過度發光之現象。又，由 於設置於反射體9之黑色薄片12(或利用黑色油墨之印刷圖 案）僅形成於自反射體9之邊緣部漏出的光之光路上’因 此，對用以照明按鍵部7之其他光（例如第1(b)圖之LI ' L2) 並無任何影響，且即使是遠離LED2之按鍵部7，亦能以充 分之光量照明。依此，可藉由大致均一之亮度，照明配置 在按鍵基板8之複數按鍵部7 ’且可滿足「亮度均一性」之 要求。 以上，若藉由本實施形態，則可提供一種開關模組， 且該開關模組係設置成面對按鍵基板者，又，可減低自反 射體之邊緣部附近朝按鍵部之方向漏出的光之光量，並藉 由於導光構件内前進的光’均一地照明按鍵部。 【圖式簡單説明】 第1 (a)至1 (c)圖係有關本發明之實施形態的開關模組 之概略截面圖。 22 201205629 第2(a)、2(b)圖係有關本發明之實施形態的開關模組之 概略截面圖。 第3(a)至3(h)圖係有關本發明之實施形態的開關模組 之俯視圖。 第4(a)、4(b)圖係說明有關本發明之實施形態的開關模 組之效果圖。 第5圖係習知開關模組之概略立體圖。 第6(a)、6(b)圖係習知開關模組之概略截面圖。 【主要元件符號說明】 1，100…開關模組 9，25...反射體 2 > 20...LED 10，35...黏著層 3...導光薄片 11，55…電極 3a...白點 12...黑色薄片 3b...第1面 12a...光吸收面 3c...第2面 12b...連接部 4，40...金屬彈片薄片 12c...安裝面 5，50…金屬彈片 13...印刷圖案 6，60...電路基板 30…導光構件 7，70...按鍵部 30a...光散射加工部 7a...按鍵頂部 a...距離 8，80...按鍵基板 U，L2，L3，L4.._ 23201205629 VI. Description of the Invention: The present invention relates to a switch module which is provided as a key substrate of an electronic device such as a mobile phone or a notebook computer. [Previously, the chair 3 has been provided with a button substrate having a button portion in an electronic device such as a mobile phone or a notebook computer, and the ON/OFF of the electrical connection is switched by contact or non-contact at the top of the button. The switch module is configured to face the button substrate. 5 is a schematic perspective view showing a conventional switch module 1A configured to face a key substrate 80 having a plurality of button portions 7A, and FIG. 6 is a view showing a switch module 1 illustrated in FIG. A schematic cross-sectional view of the 〇〇. As shown in FIG. 6(a), the switch module 1A is provided with a metal dome 50 containing the electrode 55, a circuit substrate 60, a light guiding member 3A, and an LED (light emitting diode) as a light emitting element. , Light Emitting Diode) 2〇. The metal dome 50 is held by the metal dome sheet 40 on the circuit board 60, and the light guide member 30 is attached to the metal dome sheet 40 via the adhesive layer 35 at predetermined intervals. Further, on the lower surface of the light guiding member 30, a light scattering processing portion 3a for printing processing or prism processing such as dot printing is provided, and a reflector (reflecting member) is provided between the light guiding member 30 and the LED 20. 25. The reflector 25 is configured to efficiently guide light emitted from the LED 20 from the end of the light guiding member 3A into the light guiding member 30. Further, the end portion of the reflector 25 extends to a position covering the upper surface of the light guiding member 30. According to the above configuration, the metal dome 5〇 and the electrode 55 can be electrically contacted and non-contacted by the metal dome 5〇 being deformed by pressing the button portion 7〇 downward, and the switch is turned ON and 〇FF. At the same time, since the light guide member 30 is disposed on the inner surface of the key substrate 80, that is, between the button substrate 80 and the metal dome sheet 4, the light scattering processing portion 3a can be emitted from the LED 20 and incident on the light guide. The light within the member 3 is scattered, whereby the respective button portions 7 are illuminated from the light guiding member 3''. Further, the related art is disclosed in Patent Document 专 to Patent Document 6. CITATION LIST Patent Literature Patent Literature 1. Japanese Patent Laid-Open Publication No. Hei. [Patent Document 4] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. SUMMARY OF THE INVENTION Problems to be Solved by the Invention However, the above-described conventional structure has the following problems. Fig. 6(b) shows the direction in which the light travels in the light guiding member 30 in a mode. For example, the light emitted from the LED 20 and incident on the light guiding member 30 from the end of the light guiding member 30 by the reflector 25 is light as shown in FIG. *L1, and the surface is overlaid on the light guiding member 30. And the reflection below, one side advances in the light guide 4 201205629 member 30. Further, the light shown by L2 in the figure also includes light which is scattered by the light scattering processing portion 30a and is separated from the light guide member 3 in the direction of the button portion 70 (by the light scattered thereby, illumination) Button unit 7〇). However, the light incident on the light guiding member 30 has the following light, that is, the light shown by L3 and L4 in the drawing, although the light-scattering processed portion 3 is not formed, for example, is still near the edge portion of the reflecting body 25. The upper surface of the light guiding member 30 leaks toward the button sill 80. As a result, on the surface of the key substrate 8A, there is a problem in which the light of L3 and L4 leaks, that is, the problem that the field near the LED 20 is excessively excessively emitted compared to other fields. On the other hand, it is generally required that the switch module of the illuminable button portion can illuminate the "brightness uniformity" of the plurality of button portions with uniform brightness as much as possible. However, in the above configuration, in order to satisfy the requirement of "brightness uniformity", it is necessary to avoid the arrangement of the button portion 70 in the excessive light-emitting area in the vicinity of the LED 20, and it is necessary to separate the distance between the LED 20 and the button portion 70 (closest to the LED 20). In other words, the "distance a" shown in Fig. 6(b) must be set large, and the button portion 70 cannot be disposed near the LED 2A. Accordingly, this involves the design and structural constraints of the button portion 70. That is, in the conventional structure, the requirement of the uniformity of the suppression of the tenth degree is not satisfied, and the requirement of the adjustment of the configuration of the button portion 70 is more satisfied. Therefore, the object of the present invention is to provide a switch module, and the open secret set is arranged to face the button substrate, and can reduce the leakage from the vicinity of the reflector I ^ -CI square to the button portion. The amount of light of the light, and the button portion is uniformly illuminated by the light traveling in the sound member. Means for Solving the Problem 201205629 In order to achieve the above object, in the present invention, the switch module is disposed to face the button substrate having the button portion, and further includes: a circuit substrate facing the button substrate a surface forming electrode layer; a light guiding member disposed between the button substrate and the circuit substrate; a light source element for emitting light; and a reflecting member for emitting light from the light source element from the light guiding member The end portion is incident on the light guiding member; and the button portion is moved relative to the electrode layer to switch ON/OFF of the switch, and the light incident into the light guiding member can be Illuminating the button portion from the light guiding member, wherein the light guiding member has a first surface facing the button substrate; and a second surface facing the opposite side of the circuit board, and the reflection The member is disposed to cover the first surface of the end portion, and the light absorbing member is disposed on the reflective member and the light absorbing member is blocked to be incident on the foregoing The light path of the light passing through the first surface is transmitted from the vicinity of the edge portion of the reflecting member in the light guiding member. Right, according to the above configuration, since the light absorbing member is provided on the reflecting member, and the light absorbing member blocks the light path of the light that is incident into the light guiding member and passes through the second surface near the edge portion of the reflecting member, Therefore, by absorbing light by the light absorbing member, the amount of light leaking from the vicinity of the edge portion of the reflection member can be reduced. As a result, even if the button portion is disposed close to the light source element, the problem that the button portion is excessively illuminated compared to the other button portions can be avoided, so that the design and structural constraints of the button portion arrangement can be alleviated. At the same time, it can meet the requirements of brightness uniformity. Further, since the light absorbed by the light absorbing member is limited to the light to be leaked from the vicinity of the edge portion of the reflecting member, there is almost no light amount for illuminating the button portion due to the provision of the light absorbing member 201205629. Then, the button portion can be illuminated with a sufficient amount of light. Further, it is preferable that the light absorbing member has a light absorbing/specific sheet and includes a light absorbing surface that blocks light passing through the first surface from the vicinity of the edge portion of the reflecting member. And the mounting surface is mounted on the reflective member; and the area of the mounting surface is larger than the area of the light absorbing surface. According to the above configuration, since the area of the mounting surface is larger than the area of the light absorbing surface, it is easy to mount the sheet having light absorbing property to the reflecting member, and the W material to be mounted is not easily removed, thereby improving the switching mode. The productivity and durability of the group. Further, it is preferable that the sheet material is attached to a surface of the reflecting member opposite to a surface facing the light guiding member. According to the above configuration, since the sheet material is mounted on the opposite side of the reflecting member from the surface facing the light guiding member, it is easy to mount the sheet member to the reflecting member, that is, the productivity can be improved and the manufacturing cost can be reduced. . For example, when the sheet member is mounted on the surface of the reflecting member facing the light guiding member side, since the sheet member is mounted between the reflecting member and the light guiding member, the mounting work has to be performed in a limited space, and The productivity is lowered, and the manufacturing cost can be increased by the month b. However, in the configuration of the present invention, it is easy to secure the working space, and the mounting work of the sheet material can be easily performed. Further, in order to achieve the above object, in the present invention, the switch module is disposed to face the button substrate having the button portion, and further includes: a circuit substrate for forming an electrode layer on a surface facing the button substrate; The light guide structure 201205629 is disposed between the bribe substrate and the f-path substrate; the light source element is a light emitter; and the reflection member is configured to emit light from the light source element from an end of the light guide member And the light is moved to the electrode layer, and the button portion is moved relative to the electrode layer to switch between 0N and 〇FF of the switch, and the light incident into the light guiding member can be guided from the light guide In the component inner illumination, according to (4), the optical member has a first δ facing the button substrate; and the opposite side faces the front surface of the front road substrate, and the reflective member is disposed to cover the end portion The first surface 'the surface facing the wth in the reflection member at the same time is formed on the light path of the light that is incident on the light guide member and passes through the first surface from the vicinity of the edge portion of the reflection member to form a light absorption. The ink of the print pattern. According to the above configuration, the light absorbing property is formed by the surface of the reflecting member that faces the i-th surface and is incident on the light guiding member and passes through the light of the first surface in the vicinity of the edge portion of the reflecting member. The printing pattern of the ink 'supplure' can reduce the side of the self-reflecting member by the absorption of light in the printed pattern, and the amount of light that is emitted. As a result, even if the (four) portion is placed close to the light source 70, the button portion can be prevented from being overly remarked compared to the other button portions. Therefore, the arrangement of the button portion can be alleviated and the structure can be relaxed. The constraint 'can also meet the requirements of brightness uniformity. In addition, since the light absorbed by the printing pattern using the light absorbing ink is limited to the light leaking from the vicinity of the edge portion of the self-reflecting member, there is almost no printing pattern for forming the ink using the light absorbing property. On the other hand, the amount of light used to press the button # is reduced, and the button portion can be illuminated with a sufficient amount of light. 201205629 Further, the incident light can be applied to the light guiding member, and it is preferable that the light guiding member is a light scattering processing for light scattering in the light guiding member, and the light scattering processing is described. The scattered light in the portion illuminates the aforementioned button portion. = by the above configuration, the light in the light-reflecting member can be scattered by the person, whereby the light-conducting member can be appropriately used in the light guiding member by the scattered light. Further, it is preferable that the light scattering processing means a printing force having light scattering = ink printed on the light guiding member. Or forming a two-dimensional shape having light-scattering properties on the second light guide member. In the case of the right structure, the light scattering processing can be performed by simply adding the member. In addition, here, in the case of guiding light, for example, the white ink is printed in a dot shape, and _ can be exemplified by, for example, a mold is added, a laser is added, and a 1D% force is added. The optical member is formed into a process such as unevenness, prism, or the like. Further, it is preferable that the light guiding member is made above. . The following sheet member having light transparency. Further, if, by the above structure, the entire switch module can be miniaturized by using a thin sheet member having a thin sheet member, except that the permeability is between the button portion and the electrode layer. The thickness of the optical member is thin, so that the user feels the keystroke of the user when the button portion is operated. According to the invention, a switch group can be provided, and the switch module is disposed to face the button substrate, and is also adjacent to the edge portion of the reflector. The light light leaking in the direction of the button portion is low 201205629 and the button portion is uniformly illuminated by the light traveling in the light guiding member. BRIEF DESCRIPTION OF THE DRAWINGS Figs. 1(a) to 1(c) are schematic cross-sectional views showing a switch module according to an embodiment of the present invention. Figs. 2(a) and 2(b) are schematic cross-sectional views showing a switch module according to an embodiment of the present invention. 3(a) to 3(h) are plan views of the switch module according to the embodiment of the present invention. 4(a) and 4(b) are views showing the effect of the switch module according to the embodiment of the present invention. Figure 5 is a schematic perspective view of a conventional switch module. 'Sections 6(a) and 6(b) are conventional switch modules; I. Embodiment 3 Mode for Carrying Out the Invention Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the constituent parts disclosed in the following embodiments are not intended to limit the scope of the invention to such a particular purpose, unless otherwise specified. [Embodiment] <1: Overall structure of the switch module> Referring to Fig. 1(a), the overall structure of the switch module 1 to which the embodiment of the present invention is applicable will be described. Fig. 1(a) is a schematic cross-sectional view showing the switch module 1 of the present embodiment. The switch module 1 of the present embodiment is disposed so as to face the button substrate 8 having the button 10 201205629 portion 7, and can be used in a one-touch button substrate in an electronic device such as a mobile phone or a notebook computer, (^ ^ 丫 丫 button substrate. Also, it can be used in a touch panel, etc. As shown in Fig. 1(a), the switch module 1 includes: LED 2 as a light-emitting element; and a circuit board 6 having an electrode 11 The metal dome sheet 4 (electrode layer) has a metal dome 5 covering each of the electrodes 11; and a light guiding sheet 3 (light guiding member) is attached to the metal dome sheet 4 by the adhesive layer 10. An FPC substrate (Flexible Printed Circuit) can be used for the substrate 6. Further, a reflector 9 (reflecting member) is provided between the LED 2 and the light guiding sheet 3, and the reflector 9 is effective for emitting light from the LED 2. The ground is incident on the light guide sheet 3 from the end of the LED 2, and the end portion of the reflector 9 extends to cover the upper surface of the end portion of the light guide sheet 3. If the above structure is used, the button top 7a is directed to the front. Moving in the lower middle to press the metal dome sheet 4, Thereby, the metal shrapnel 5 is deformed, and the metal dome 5 is in contact with the electrode 11. Thus, the metal dome 5 and the electrode 11 are electrically connected, that is, the open relationship is switched from OFF to ON. From the viewpoint of operability, the switch module should be designed to convey a sufficient keystroke feeling to the user when the button portion is pressed, and if it is formed by the present embodiment, it is made by a metal shrapnel having a certain strength. The deformation of 5 switches the ON and OFF of the switch, so that a sufficient keying sensation can be conveyed to the user. In addition, each of the metal domes 5 is integrally followed by 'within the manufacturing process' with respect to the metal dome sheet 4 The metal dome sheet 4 on which the metal dome 5 is mounted is mounted on the circuit board 6, and the metal dome 5 can be mounted with good precision and with a simple procedure with respect to the plurality of electrodes. 201205629 <2: Light guide sheet> The light guide sheet 3 used in the present embodiment will be described. In the present embodiment, an amine phthalate rubber sheet (thermosetting property) having a thickness of 125 μm and a hardness of 97 and having light transmittance is used. However, the material which can be applied as the light guiding sheet 3 is not limited thereto. A transparent sheet such as a polycarbonate film or a ruthenium rubber sheet can also be used. Further, the thickness of the light guiding sheet 3 is not particularly limited. However, it is more preferable to have a thickness of 1 μm or more and 300 μίη or less. In addition, the "transparent sheet" as used herein does not necessarily mean that it is colorless and transparent, and the light guide sheet 3 is not limited to "colorless and transparent" as long as it is transparent to light emitted from the LED 2. In the present embodiment, it is used as it is. The light guide sheet 3 having a small thickness can achieve the miniaturization of the switch module 1 and, in addition, the sensitivity of the key click feeling can be improved. Further, in the surface of the light guide sheet 3, the surface is The surface on the side of the key substrate 8 (the upper surface in the drawing) is referred to as a "first surface 3b", and the surface facing the circuit board 6 side (the lower surface of the circle) is referred to as a "second surface 3c". The light guiding sheet 3 is subjected to light scattering processing on the second surface 3c, and the light scattering processing is to scatter light incident on the light guiding sheet 3 and can be scattered light (light of L2 in the first (b) diagram) The self-light-guiding sheet 3 illuminates the button portion 7 therein. Here, in the light scattering processing, a dot printing (printing process) using white ink (ink having light scattering property) is performed by an ink jet printer, whereby white dots 3 a are printed on the second surface 3 c (at This 'white ink is used as the light-scattering ink'. However, as long as it has light-scattering properties, an ink other than white can be used. The white dots 3a are printed at positions corresponding to the button portions 7 respectively, whereby the light that has been incident on the light guide sheets 3 from the LEDs 2 can be scattered by the white dots 3a, and by 12 201205629 by scattered light, self-guided The button portion 7 is illuminated inside the light sheet 3. In addition, the point of the white point % is not particularly limited by the degree, the shape, etc., however, by way of example, the point of increasing the white point % is increased by the distance from the field of the LED 2 (the field of light attenuation), even if it is disposed far away The button portion 7 in the field of LED2 can also be illuminated with a sufficient amount of light. Further, the form of the light-scattering processing is not limited to this, and a three-dimensional shape processing such as mold reinforcement or laser processing may be performed at a predetermined position, and irregularities and ridges may be formed on the light guide sheet 3. Mirror shape. At this time, similarly to the white point 3a, the light portion 7 can be appropriately illuminated by scattering light using a portion which has been subjected to three-dimensional shape processing. Further, the printing process (white point 3a) is applied to the second surface 3c, but the three-dimensional shape processing can also be performed on the first surface 3b of the light guiding sheet 3. At this time, it is also possible to scatter the light in the three-dimensional shape processing which has been performed in the third face, thereby allowing the light to be transmitted from the second surface to the direction of the button portion 7 and appropriately illuminating the button portion 7. <3: Reflector> In the present embodiment, a reflector 9 for allowing light emitted from L E D 2 to efficiently enter the light guide sheet 3 from the end portion of the light guide sheet 3 is provided. When the light guide sheet 3 having a small thickness is used as in the present embodiment, the thickness of the light guide sheet 3 is often thinner than the width of the light emitting region of the LED 2, and in this case, the light emitted from the LED 2 is efficiently incident on the light guide. In the sheet 3, it is effective to provide the reflector 9 between the LED 2 and the light guiding sheet 3. In the present embodiment, in order to more efficiently cause light to enter the end portion of the light guiding sheet 3, the reflector 9 is disposed to cover the first surface 3b. However, the shape of the reflector 9 is not particularly limited. As shown in the figure, a predetermined interval may be provided between the reflector 9 and the first surface 31. 13 201205629, and the reflector 9 may be in close contact with the first surface 3b without providing a space therebetween. <4: Light advancing method> Referring to Fig. 1(b), a light advancing method in the light guiding sheet 3 in the present embodiment will be described. Fig. 1(b) is a schematic cross-sectional view showing the vicinity of the LED 2 in the vicinity of the switch module 1 shown in Fig. 1(a). The light emitted from the LED 2 is incident on the light guiding sheet 3 from the end portion of the light guiding sheet 3 by the reflector 9, and also includes light that is directly incident on the light guiding sheet 3 without being transmitted through the reflector 9. In the present embodiment, the first surface 3b and the second surface 3c of the light guiding sheet 3 are both connected to the air layer, and due to the difference in refractive index (if the refractive index of the air layer is made 1_〇, the light guiding sheet 3 Since the refractive index is about 丨45), the light that travels in the light guiding sheet 3 is reflected by the first surface 3b and the second surface 3c as shown by li and L2 in the figure, and is directed toward the light guiding sheet 3 The other end is moving forward. Further, when there is a white point 3a on the optical path, the light is scattered at the white point, and as shown by L2 in the circle, the light is released from the light guide sheet 3 in the direction of the button portion 7. In addition, the light incident on the metal dome sheet 4 through the adhesive layer 1 after being emitted from the LED 2 is also included. However, the light is also reflected by the surface of the metal dome 5 and the like, and is again transmitted through the adhesive layer 10. It is incident into the light guiding sheet 3. <5: Structure for reducing light leakage> Referring to Figs. 1(b) and 1(c), the structure of "light leakage" which is listed as a conventional problem will be described. Fig. 1(c) is an enlarged view of the pattern of the light u shown in Fig. 1(b). As described above, in the vicinity of the end portion of the light guiding sheet 3 close to the LED 2, there is light transmitted through the first surface 3b (the dotted line portion of L3 in the first (b) and the first (c) diagram), and it is known in 201205629 In the structure, such light causes a phenomenon in which light leaks from the edge portion of the reflector. Therefore, in the present embodiment, in order to solve the problem, the black sheet 12 (light absorbing member) is placed to block the light path of the light that has passed through the first surface 3b from the vicinity of the edge portion of the reflector 9, and the leakage is reduced. The amount of light. More specifically, the upper surface of the reflector 9 (the side opposite to the light guiding sheet 3) is followed by the black sheet 12, and the end of the black sheet 12 is projected from the edge of the reflector 9 to block the self-reflection. The light path of the light passing through the first surface 3b in the vicinity of the edge portion of the body 9. By the above configuration, the light L3 leaking from the edge portion of the reflector 9 can be absorbed in the black sheet 12, and therefore, < The amount of light leaking from the edge of the reflector 9 is reduced. Here, the black sheet 12 is used as the light absorbing member. However, a sheet other than black may be used, and a member other than the sheet may be used as long as it is a member that appropriately absorbs light. The film or the like is attached to the structure of the reflector 9. Further, when the black sheet 12 is mounted on the upper surface of the reflector 9, since it is easy to secure the space required for the mounting work, it has the effect of improving productivity and reducing manufacturing cost. However, the mounting of the black sheet 12 is not limited thereto. That is, as shown in Fig. 2(b), the black sheet 12 may be attached to the lower surface of the reflector 9 (on the side of the light guiding sheet 3). Even in the above configuration, light leaking from the vicinity of the edge portion of the reflector 9 can be absorbed, so that the subject to date can be solved. However, it is preferable that the black sheet 12 is positioned above the reflector 9 from the viewpoint of largely obtaining the effective area of the reflector 9 (the area of the field used for light reflection). Further, as another structure for reducing light leakage, as shown in Fig. 2(a), it is also possible to correct the surface of the first surface 31? by the 2012 201229, that is, the surface of the reflector 9 is configured as follows. On the light of the light road (the vicinity of the edge of the block & + office 9 through the first surface 3 is the self-reflecting ancestor 4 瘃 print pattern 13 . You #), the formation of the use of light absorption / / by the less light road Bit 6 , g color ink, however, the ink of the absorption is exemplified by inks such as 'private & When, for example, the printed pattern 13, ?γ, 琛 青 cyan, and the like. In addition, in the shape of the ink-jet printing method, the screen printing: the light. The structure can also be absorbed from the vicinity of the edge of the reflector 9 <6: Regarding the setting of the black sheet = Fig. 3 is a view of the setting of the black sheet 12 各, 、, ^, ^ is a mode view of the switch module 1 of the present embodiment , the position map of the black sheet 12 is set. / / said full rebellion, as shown in Figures 3 (a), 3 (c), 3 (e), when the enamel sheet 12 is hidden in the reverse mold i, the position of the black sheet 12 can be black 2 M (five) 〃, as shown in the position 3 (f) of the third (b), 3 (d), the inner side of the projecting body 9 (below the reflector 9), or the black sheet 12 toward the reflector 9 The position on the outside (in the figure) extends. Further, as described above, when the black sheet 12 protrudes toward the outside of the reflector 9, the black sheet 12 can be disposed on both the upper surface and the lower surface of the reflector 9. Further, when the black sheet 12 is projected toward the outer side of the reflector 9, the protrusion width (the amount of exposure from the edge portion of the reflector 9 in the Υ direction in the drawing) is made "the extension width of the black sheet 12". According to the intensive review of the inventors, it can be seen that if the "stretching width (mm)" is made 〇3 mm or more and 〇.7 mm or less, it is possible to more effectively absorb only the light constituting the cause of light leakage. Further, the "illumination area" in the third (a) to (f) diagrams indicates the area corresponding to the button portion 7, however, the setting of the "illumination area" and the phase of the LED 2 16 201205629 is determined. The position of the black sheet 12 (or the printed pattern 13 using black ink) is more effective. For example, as shown in Figures 3(a) and 3(b), if the black sheet 12 is formed to form a slit on the front surface of the LED 2, excessive light emission in the "illumination area" can be suppressed, and more is derived from LEd2. The light penetrates toward the lower side (Y direction) in the drawing, so that even the button portion 7 located far from the LED 2 can be illuminated with a sufficient amount of light. Further, as shown in Figs. 3(c) and 3(d), if the black sheet 12 is attached to the front surface of the LED 2 and no slit is provided, excessive light emission in the "illumination region" can be more reliably suppressed. Further, when the front side of the LED 2 has the "illumination area" as shown in Figs. 3(e) and 3(f), if the black sheet 12 is attached to the front surface of the LED 2, the excessive light emission in the "illumination area" can be appropriately suppressed. In other words, the position of the black sheet bundle 2 can be any position as long as it can absorb only the light leaking from the "illumination region". <7: Shape of black sheet> In the present embodiment, as shown in Figs. 3(a) to 3(f), the black sheet U is formed into a rectangular shape. However, the shape of the black sheet 12 is not particularly limited. For example, the shape of the two faces having different connection areas as shown in Figs. 3(g) and 3(h) may be used. The black sheet 12 in the present embodiment is shaped so as to absorb only light leaking from the minute areas, and also does not absorb other light. The black sheet 12 is often formed into a small size. However, at this time, it is difficult to mount the black sheet 12 to the reflector 9 with good positional accuracy. Therefore, as shown in Figs. 3(g) and 3(h), the mounting property can be improved by using the following black sheet 12, that is, the light absorbing surface 12a of the light path blocking the light is connected and mounted by the connecting portion 12b. On the mounting surface 12c of the reflector 9. In other words, by forming the area of the mounting surface 12c larger than the area of the light absorbing surface 12a, 17 201205629 can effectively absorb only the light constituting the object to be absorbed, and the black sheet 12 can be easily attached to the reflector 9. Further, not only the mounting property of the black sheet 12 is improved, but also the area is increased. Therefore, the black sheet 12 is less likely to fall off and the durability can be improved. Further, as shown in Fig. 3(g), the light absorbing surface 12a may be located away from the edge portion of the reflector 9. <8: Verification Experiment> The following verification experiments were performed on (Comparative Example) and (Example 1) to (Example 5), respectively, to verify that the effect of excessive light emission in the "illumination region" can be suppressed. Hereinafter, the conditions and results of the verification experiment will be described with reference to Figs. 4(a) and 4(b). Fig. 4(a) shows a pattern diagram of the "illumination area" (corresponding to the area of the button portion) and the arrangement of the LED 2 used in the verification experiment, and the 4th (b) diagram is respectively (comparative example (left) And the luminance contour map measured in (Example 1 (right)) (the upper side is a plan view, and the lower side is a three-dimensional diagram). Further, here, RISA-COLOR/ONEII manufactured by HI-LAND Co., Ltd. is used as a device for measuring brightness. (Comparative Example) As a comparative example, in the arrangement of the "illumination region" (button portion) shown in Fig. 4(a), the luminance of the illumination region is measured for the case where the black foil 12 is not attached to the reflector 9. Cd/m2). According to the intensive review of the inventors, in the plural "illumination area" of the figure, the "illumination area" (the area indicated by the oblique line) located at the upper left and the upper right may cause a significant "over-luminescence" phenomenon, thereby It is confirmed that the "brightness uniformity" that reaches the satisfaction level cannot be achieved. Therefore, the luminance is compared between (Comparative Example) and (Example 1) to (Example 5) with the "illumination region" located at the upper left and the upper right. In addition, in (Comparative Example), the brightness of the "illumination area" on the upper left of 18 201205629 is 39.6 cd/m2, and the brightness of the "illumination area" on the upper right is 37.2 cd/m2, which is known to be compared with other "illumination areas". Brightness will show high brightness. In addition, locally, it can be confirmed that in the upper left "illumination area", it is close to the upper left area of LED2, and in the upper right "illumination area", it is close to the upper right area of LED2. Over-lighting. (Embodiment 1) In the first embodiment, as shown in Fig. 4(a), the black sheet 12 is attached to the reflector 9, and the "stretch width (mm)" of the black sheet 12 is made 0.5 mm. In the figure, the width in the X direction is made 3 mm. As a result of measuring the brightness by the above conditions, the luminance of the "illumination area" on the upper left side was 21.9 cd/m2 (39.6 cd/m2 in the comparative example), and the brightness of the "illumination area" on the upper right side was 22.9 cd/m2 (for comparison) In the example, it is 37.2 cd/m2), and it can be confirmed that it is greatly reduced. Further, in other "illumination areas", the brightness is lowered in the "illumination area" close to the LED 2, and on the other hand, a large brightness reduction is not observed in the "illumination area" away from the LED 2. That is, it can be seen that the "excessive illumination" can be suppressed and the requirement of "brightness uniformity" is satisfied. (Embodiment 2) In the second embodiment, the "stretching width (mm)" of the black sheet 12 was made 0-7 mm, and the width in the X direction in the drawing was made the same as that of the first embodiment (3 mm). As a result of measuring the brightness by the above conditions, the luminance of the "illumination area" on the upper left side was 19.5 cd/m2 (39.6 cd/m2 in the comparative example), and the brightness of the "illumination area" on the upper right side was 20.5 cd/m2 (for comparison) In the example, it is 37.2 cd/m2), and it can be confirmed that it is greatly reduced. Further, in the other "illumination areas", the brightness is lowered in the "illumination area" of the LEDs 2, 201205629, and the brightness reduction is not seen in the "illumination area" of the LEDs 2. That is, it is known that "excessive illumination" can be suppressed and the requirement of "brightness uniformity" is satisfied. (Example 3) In Example 3, the "stretch width (mm)" of the black sheet 12 was made 0.1 mm, and the width in the X direction in the drawing was made the same as that of the first example (3 mm). As a result of measuring the brightness by the above conditions, the luminance of the "illumination area" on the upper left side was 38.7 cd/m2 (39.6 cd/m2 in the comparative example), and the brightness of the "illumination area" on the upper right side was 36.2 cd/m2 (for comparison) In the example, it is 37.2 cd/m2) 'can be confirmed to be reduced separately. Further, in other "illumination areas", the brightness is lowered in the "illumination area" close to the LED 2, and on the other hand, a large brightness reduction is not observed in the "illumination area" far from the LED 2. That is, it can be seen that the "excessive luminescence" can be suppressed and the requirement of "brightness uniformity" is satisfied. (Embodiment 4) In the fourth embodiment, the "extension width (mm)" of the black sheet 12 is made 0-3 mm' and the width in the X direction in the drawing is made the same as that of the first embodiment (3 mrn). As a result of measuring the brightness by the above conditions, the brightness of the "illumination area" on the upper left side was 26.0 cd/m2 (39.6 cd/m2 in the comparative example), and the brightness of the "illumination area" on the upper right side was 24.5 cd/m2 (for comparison) In the example, it is 37.2 cd/m2), and it can be confirmed that it is greatly reduced. Further, in other "illumination areas", the brightness is lowered in the "illumination area" close to the LED 2, and on the other hand, a large brightness reduction is not observed in the "illumination area" away from the LED 2. That is, 叮 knows to suppress "excessive luminescence" and satisfies the requirement of "brightness uniformity". (Embodiment 5) 20 201205629 In the fifth embodiment, the "extension width (mm)" of the black sheet 12 was made 1.0 mm' and the width in the χ direction in the drawing was made the same as that of the example (3 mm). As a result of measuring the brightness by the above conditions, the luminance of the "illumination area" on the upper left is 16.1 cd/m2 (39 6 cd/m2 in the comparative example), and the redundancy of the "illumination area" on the upper right is 17 2 ccj/m2 (in In the comparative example, md/m2) was confirmed to be greatly reduced. Further, in the other "illumination areas", the brightness is lowered in the "illumination area" close to the LED 2, and on the other hand, a large brightness reduction is not observed in the "illumination area" away from the LED 2. That is, it is known that "excessive illumination" can be suppressed and the requirement of "brightness uniformity" is satisfied. Next, the fourth (b) figure is a luminance contour map showing the "illumination area" on the upper left side of the fourth (a) figure in (Comparative Example) and (Example 1). In the figure shown in Fig. 4(b), the upper side of the "illumination area" in the upper left "illumination area" is shown as the upper part of the "illumination area" on the upper left side. As shown in the figure, in the (comparative example), it is understood that the high-level brightness is particularly high in the "light-illuminating region" as a whole, and in particular, the upper left region of the LED 2 is displayed. On the other hand, in (Example), it is understood that the brightness is lowered as a whole. That is, it can be seen that by providing the black sheet 12, "excessive light emission" can be surely suppressed. <9: Effect of the present embodiment> With the switch module 1 of the present embodiment, the following effects that cannot be obtained in the conventional structure can be obtained. (Design and structural constraints on the arrangement of the button portions) According to the switch module 1 of the present embodiment, the amount of light leaking from the vicinity of the edge portion of the reflector 9 can be reduced by the above-described configuration. Accordingly, in the conventional structure, when the button portion is disposed close to the LED, a problem occurs in which the button portion near the LED is extremely over-exposed due to leakage of light at bit 21 201205629, whereby the button portion cannot be generated. In the present embodiment, even if the button portion 7 is disposed close to the LED 2, the problem of such excessive light emission does not occur. Accordingly, the distance a shown in FIG. 1(b) (the distance between the button portion 7 closest to the LED 2 and the LED 2) can be narrowed, that is, the button portion 7 is disposed close to the LED 2, and the arrangement of the button portion can be alleviated. Design and structural constraints. (Regarding luminance uniformity) According to the present embodiment, it is possible to suppress the phenomenon that the button portion 7 disposed in the vicinity of the LED 2 is excessively excessively emitted compared to the other button portions 7. Further, since the black sheet 12 (or the printing pattern using the black ink) provided on the reflector 9 is formed only on the optical path of the light leaking from the edge portion of the reflector 9, "the other light for illuminating the button portion 7 is (For example, LI ' L2 in Figure 1(b)) has no effect, and even if it is away from the button portion 7 of the LED 2, it can be illuminated with a sufficient amount of light. Accordingly, the plurality of button portions 7' disposed on the key substrate 8 can be illuminated by substantially uniform brightness, and the "brightness uniformity" can be satisfied. As described above, according to the present embodiment, a switch module can be provided, and the switch module is disposed to face the button substrate, and the light leaking from the vicinity of the edge portion of the reflector toward the button portion can be reduced. The amount of light is uniformly illuminated by the light traveling in the light guiding member. BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1(a) to 1(c) are schematic cross-sectional views showing a switch module according to an embodiment of the present invention. 22 201205629 2(a) and 2(b) are schematic cross-sectional views of a switch module according to an embodiment of the present invention. 3(a) to 3(h) are plan views of the switch module according to the embodiment of the present invention. 4(a) and 4(b) are views showing the effect of the switch module according to the embodiment of the present invention. Figure 5 is a schematic perspective view of a conventional switch module. Figures 6(a) and 6(b) are schematic cross-sectional views of conventional switch modules. [Description of main component symbols] 1,100...switch module 9,25...reflector 2 > 20...LED 10,35...adhesive layer 3...light guide sheet 11,55...electrode 3a ...white point 12...black sheet 3b...first surface 12a...light absorbing surface 3c...second surface 12b...connecting portion 4,40...metal shrapnel sheet 12c.. Mounting surface 5, 50...metal dome 13...printing pattern 6,60...circuit board 30...light guiding member 7,70...button portion 30a...light scattering processing portion 7a...button top a...distance 8, 80... button substrate U, L2, L3, L4.._ 23