1344162 (1) 九、發明說明 【發明所屬之技術領域】 本發明是關於一種在行動電話、其他小型的電子機器 中，能防止因將固定電極嵌入成型在盒體時發生樹脂覆蓋 造成的弊害的開關。 【先前技術】 一直以來已知有如第4圖所示，在由塑料等形成作爲 殼體的基板12的成型時，藉由嵌入成型形成作爲中央電極 1 3與側電極1 4的固定電極的開關（專利文獻1 )。 此開關10是藉由嵌入成型將中央電極13與側電極14形 成在絕緣性基板12的上面凹部內，在該等固定電極上配置 朝下的碗型板簧15，並以金屬蓋20包圍固定載置在該導電 性板簧15上的按鈕18的開關，且是利用按鈕18的突起部19 的按壓上述導電性板簧15將中央電極13與側電極14導通， 解除按壓時，利用導電性板簧15的復原力使按鈕18復原的 開關。 [專利文獻1]日本特開平5-120953號公報 【發明內容】 [發明所欲解決的課題] 使用在這種行動電話、其他小型電子機器的開關10由 於大小只有寬度3〜4mm，且固定電極的厚度爲〇.2mm左 右極爲的薄，所以在基板12的塑料成型時，將中央電極13 (2)1344162 與側電極14 一體嵌入成型時，就如第5圖（ 示，塑料會流入塑料製基板12與金屬製電極 部分而發生樹脂覆蓋60。 更具體而言，是如第5圖（a)所示，金 衝壓加工時由於會在下側角部產生些許的毛 毛邊朝上進行塑料成型時，在有金屬製電極 的邊界部分A的樹脂覆蓋會變少。然而， 接觸部14連續到端子部14a，在埋入塑料製 界部分B會發生樹脂覆蓋60，而導致所謂側 性板簧15接觸不良的問題。 在該第5圖（a)所示的例子，由於是藉 接觸部14b鼓出，所以樹脂覆蓋60的量會比 必須有藉由壓縮加工使接觸部14b鼓出的步 這種小型開關精度佳的予以加工是極爲的麻 在這裡如第5圖（b )所示，若只以彎折 14b確實地露出的話，便不需進行上述壓縮 容易。然而，在埋入塑料製基板12中的邊界 行壓縮加工產生更多的樹脂覆蓋60，而導致 與導電性板簧15接觸不良的問題。 本發明是以提供一種不需進行壓縮加工 覆蓋並確實地電連接的開關，且是開關較小 關。 [用以解決課題的手段] a )或（b )所 1 3、1 4的邊界 屬製電極14在 邊，所以使該 14端部的毛邊 從側電極14的 基板1 2中的邊 電極14與導電 由壓縮加工使 較少，但因爲 驟，所以要將 煩。 加工使接觸部 加工所以加工 部分卻會比進 所謂側電極Μ ，可消除樹脂 電極極薄的開 -5- (3) (3)1344162 根據本發明的開關，是以嵌入成型的方式將中央電極 和側電極安裝在盒體內，將端部常時接觸在上述側電極並 利用按鍵表面的進退動作使中央部與上述電極接觸分離的 接觸片收納在上述盒體的接觸片收納凹部，隔著上述接觸 片利用上述按鍵表面的進退動作將中央電極與側電極之間 導通•關閉的開關，其特徵爲，上述側電極具備有：與上 述接觸片常時接觸的側接觸部；以及從該側接觸部一體沿 著上述盒體的接觸片收納凹部的內壁彎折的立起部。 更理想的是沿著上述側接觸部與上述立起部的彎折部 分形成凹部。 亦可在上述立起部與上述側接觸部的相反緣部彎曲形 成水平部。 [發明的效果] 根據申請專利範圍第1項，以嵌入成型的方式將中央 電極和側電極安裝在盒體內，將端部常時接觸在上述側電 極並利用按鍵表面的進退動作使中央部與上述電極接觸分 離的接觸片收納在上述盒體的接觸片收納凹部，隔著上述 接觸片利用上述按鍵表面的進退動作將中央電極與側電極 之間導通•關閉的開關，上述側電極由於具備有：與上述 接觸片常時接觸的側接觸部；以及從該側接觸部一體沿著 上述盒體的接觸片收納凹部的內壁彎折的立起部，所以不 會在側電極的側接觸部產生樹脂覆蓋的情形，且能提昇開 關的導通•關閉性能。此外，由於從側接觸部一體立起的 -6- (4) (4)1344162 立起部只進行彎折加工，而不需要壓縮加工，所以使用於 小型電子機器的開關的製造簡單，且精度變的更高。 根據專利申請範圍第2項，由於沿著上述側面接觸部 與上述立起部的彎折部分形成凹部，所以不僅增加了側接 觸部與接觸片的接觸面積，且即使樹脂從立起部側流入時 能形成樹脂停滯，並防止樹脂流到側接觸部上面的影響。 根據申請專利範圍第3項，由於在上述立起部與上述 側面接觸部的相反緣部彎曲形成水平部，所以即使在例如 立起部的上端部發生樹脂覆蓋時亦能確實地防止樹脂流入 到立起部的內面。 【實施方式】 [用以實施發明的最佳形態] 本發明的最佳形態是採用以嵌入成型的方式將中央電 極和側電極安裝在盒體內，將端部常時接觸在上述側電極 並利用按鍵表面的進退動作使中央部與上述電極接觸分離 的接觸片收納在上述盒體的接觸片收納凹部，隔著上述接 觸片利用上述按鍵表面的進退動作將中央電極與側電極之 間導通•關閉的開關。 且上述側電極具備有：與上述接觸片常時接觸的側接 觸部；以及從該側接觸部一體沿著上述盒體的接觸片收納 凹部的內壁彎折的立起部。 能沿著上述側接觸部與上述立起部的彎折部分形成凹 部。及/或能在上述立起部與上述側面接觸部的相反緣部 (5) (5)1344162 彎曲形成水平部。藉由該附加的構造能更有效地達成本發 明的目的。 [實施例1 ] 依據第1至3圖說明本發明的實施例。 第3圖（a)中，本發明的開關25是由：盒體27、一體 安裝在該盒體27的中央電極28及側電極29、收納在上述盒 體27的接觸片收納凹部34的接觸片30、被覆在上述盒體27 前面的防塵薄片31、按壓上述接觸片30的按鍵表面32、以 及將該等零件全體包覆成一體化的金屬蓋3 3所構成。 上述盒體2*7是由塑料等的絕緣性材料所構成，在前面 形成橫長的接觸片收納同部34，在後面的四個角部形成端 子用缺口 35，且在兩側面形成組合溝36。在該盒體27將中 央電極28與側電極29—體嵌入成型。 該等之中中央電極28是如第3圖（C)所示，由中央接 觸部28b與兩側端子部28a形成T字形，中央接觸部28b 露出在上述接觸片收納凹部3 4的中央，且中心部份鼓出， 端子部28a從盒體27的上下面突出，在成型後在端子缺口 35部分朝後方彎折與盒體27的上下面成爲平行。 上述側電極29是具有本發明的特徵性構造，在預定的 間隔與兩根側電極29及與該等一體的端子部28a形成π字 形，上述側接觸部29b從上述接觸片收納凹部34的底部露 出連續兩側壁的端面L字形，端子部29a從盒體27的上下 面突出在端子用缺口 35部分朝後方彎折與盒體27的上下面 -8- (6) (6)1344162 成爲平行。 根據第2圖說明上述側接觸部29b的更詳細的構造。 在第5圖（a)或（b)所示的習知例，從側電極Mb 的接觸部連續到端子部14a在邊境部分b埋入塑料製基板 1 0中。 相對於此’本發明側接觸部29b的基本形狀是如第2 圖（a)所示’當與接觸片30的固定片部38接觸的部分構 成水平的側接觸部29b時，則如具有立起部29c —般一體 彎折成端面L字形。結果，在與立起部29上端的盒體17的 邊界部分C ’即使發生例如樹脂覆蓋6 0的情形時，會傳到 立起部29c的內面而不會流入到側接觸部29b的上面。 在上述水平側接觸部29b與立起部29c的彎折點是如 第2圖（b)所示，藉由形成凹部29d，不僅增加了與固定 片部3 8的接觸面積，且即使樹脂從立起部29c側流入時能 形成樹脂停滞並防止樹脂流入到側接觸部29b上面的影響 〇 再將上述立起部29c的上端部彎折形成如第2圖（c) 的水平部29e的方式，即使再如上述立起部29c的上端部 發生樹脂覆蓋60的情形時，亦能防止其流入到立起部2k 的內面。 在第2圖（a) (b) (c)，水平的側接觸部29的端部 A雖與上述接觸片收納凹部34的底部平行，但在第2圖（d )表示藉由彎折加工在水平的側接觸29b的端部A形成彎 曲的埋入部2 9f，並將其埋入到上述接觸片收納凹部34的 -9 - (7) (7)1344162 底部，而使側接觸部29b的上面成型成比接觸片收納凹部 3 4的底部稍高的例子。根據這樣的構成，在邊界點A能 更確實地防止樹脂覆蓋60。 上述接觸片30是由具有長度X寬度X厚度=2.6x1.2x 0.06mm左右的導電性與彈性的金屬板所構成，整體形成 朝下的碗型，藉由切開在長方向的雨條溝，在中央形成朝 上彎曲的可動片部37，在兩側形成朝下彎曲的固定片部38 〇 將該接觸片30收納在上述盒體27的接觸片收納凹部34 時，兩側的固定片部38被載置在上述側電極29的側接觸部 29b上成常時的電接觸，且可動片部37的頂部是與中央電 極28的中央接觸部28b保持間隙相對向而置》 上述防塵薄片31具有電絕緣性，且爲具有黏接劑的軟 性薄片，該防塵薄片31是將接觸片30收納在上述盒體27的 接觸片收納凹部34後，以接著劑黏接在盒體27的上端面。 上述按鍵表面32爲塑料、金屬等對於材料並沒有特別 的限定，鍵鈕部40突出在細長薄板狀的導引本體部39的前 面側，圓錐狀的按壓突起部41—體形成在後方側。該按鍵 表面32是使按壓突起部41位於防塵薄片31的中心而配置。 上述金屬蓋33具有導電性，藉由衝床等沖切厚度 0.2mm左右的金屬板，並予以彎折加工而成，在與上述防 塵薄片31大致相同大小的前面部42的中心穿設讓上述鍵鈕 部40前進後退的鍵鈕貫穿孔46，將該前面部42的上端部與 下端部分別朝後方彎折作成頂板部43和底板部44，又將前 -10- (8) (8)1344162 面部42的兩側部分別朝後方彎折作成側板部45。上述頂板 部43和底板部44的寬度是如第1圖所示，作成有上述按鍵 表面32的導引本體部39與按壓突起部41的厚度左右的寬度 。尤其底板部44是如第3圖所示，朝向後方鼓出形成有2條 凸條部47，將上述按鍵表面32的導引本體部3 9載置在該凸 條部47上，使按鍵表面32的進退順暢，並且在與後述的印 刷電路基板26的前方固定焊接邊5 1之間形成些許的間隙’ 防止銲錫的助銲劑溢流。 上述側板部45形成有靠近上述底板部44側面朝下的定 位突片部48。該定位突片部48亦可是垂直朝下延伸的形狀 ，亦可如以二點虛線所示朝外水平彎折而與底板部44形成 同一面。該側板部45在途中作成細寬的夾入片58而可嵌合 在上述盒體27的組裝溝36，再往該夾入片58後方延長作成 擴開彎曲片部49。該擴開彎曲片部49是朝外彎曲狀彎折， 且在前端部的下端形成與上述底板部44的下面成同一面的 突起部57。 就上述構成的各零件的組裝進行說明。 盒體27中，與盒體27—體嵌入成型的中央電極28的端 子部28a與側電極29的端子部29a，上側是朝後方彎折或 被切斷，下側是朝後方被彎折，將接觸片收納在前面的接 觸片收納凹部34。將防塵薄片31黏貼在盒體27的前面。 按鍵表面32從金屬蓋33的後方嵌合使鍵鈕部40從鍵鈕 貫穿孔46突出。又將之前組裝有接觸片30與防塵薄片31的 盒體27從後方裝入金屬蓋33而與鍵頂板32重疊。進行該裝 -11 - 1344162 Ο) 入時，由於兩側的側板部45的後端部的擴開彎曲片部49各 自朝外張開，所以按鍵表面32與盒體27能順利地嵌合。 將按鍵表面32與盒體27嵌合後’將金屬蓋33的頂板部 4 2和底板部4 4密接在防塵薄片3 1的狀態下’將兩側的側板 部45的後端部擴開彎曲片部49分別朝內側彎折完成按鈕開 關25的組裝。此時，因爲擴開彎曲片部49被彎折，所以會 在與盒體2 7的後面之間形成些許的間隙5 6 ° 接著，在上述印刷電路基板26載置上述金屬蓋33的底 板部44的固定位置設有前方固定焊接邊51，在該前方固定 焊接邊5 1的兩側形成定位突片部48插入的定位孔50 ’並設 有側方固定焊接邊52，且在後方中央設置固定突起部57的 後方固定焊接邊53’又在該後方焊接邊53的兩側設有固定 上述端子部28a和端子部29a的同時使其電連結的電極焊 接邊54。 在該印刷電路基板26的定位孔50、前方固定焊接邊51 、側方固定焊接邊52、後方固定焊接邊53、電極焊接邊54 上進行對應按鈕開關25各部的位置校對並予以載放加熱。 如此一來，各前方固定焊接邊51、側方固定焊接邊52、後 方固定焊接邊53、電極焊接邊54的銲錫熔融將按鈕開關25 固定的同時並予以電連接。 此時，在底板部44是如第3圖及第1圖所示，即使金屬 蓋33的厚度很薄亦能以銲錫55大面積的予以固定，並且銲 錫5 5會流入凸條部47下面的間隙，而可防止銲劑溢流的損 害，且由於能流入較多的銲錫5 5，所以可予以堅固地固定 -12- (10) (10)1344162 。定位突片部48是垂直的狀況、水平的狀況皆可以定位孔 5〇予以定位，且在側方固定焊接邊52可以銲錫55大面積地 予以固定。擴開彎曲片部49的突起部57雖以銲錫55固定在 後方固定焊接邊53，但在擴開彎曲片部49與盒體27後面的 間隙56會如第2圖所示，銲錫55會因毛細管現象的作用而 以銲錫55大面積地侵入固定在後方固定焊接邊53。 端子部28和端子部29a是將下面彎折的平面部接觸在 電極焊接邊54並利用銲錫55以大面積進行固定。 【圖式簡單說明】 第1圖表示本發明的開關的一實施例的縱剖側視圖。 第2圖（a) ( b ) ( c ) (d)分別表示本發明的開關 的側電極2 9的不同例的剖視圖。 第3圖表示本發明的開關的一實施例的分解立體圖。 第4圖爲習知開關1 0的縱剖前視圖。 第5圖（a) (b)表示習知開關10的各種側電極丨4的 不同例的剖視圖。 【主要元件符號說明】 1 〇 :按鈕開關 1 1 :印刷電路基板 12 :基板 1 3 :中央電極 1 4 :側電極 -13- (11)1344162 1 5 :導電性板簧 1 6 :間隔件 1 7 :上蓋 1 8 :按鈕 1 9 :突起部 20 :金屬蓋 21 :電極用焊接邊 22:接地兼用固定用焊接邊 23 :缺口 2 5 :按鈕開關 26 :印刷電路基板 27 :盒體 28 :中央電極 28a ：端子部1344162 (1) EMBODIMENT OF THE INVENTION [Technical Field] The present invention relates to a mobile phone and other small electronic devices capable of preventing the occurrence of defects caused by resin covering when a fixed electrode is insert molded in a casing. switch. [Prior Art] As shown in Fig. 4, when the substrate 12 as a casing is formed of plastic or the like, a switch which is a fixed electrode of the center electrode 13 and the side electrode 14 is formed by insert molding. (Patent Document 1). In the switch 10, the center electrode 13 and the side electrode 14 are formed in the upper concave portion of the insulating substrate 12 by insert molding, and the bowl-shaped leaf spring 15 facing downward is disposed on the fixed electrodes, and is surrounded by the metal cover 20 The switch of the button 18 placed on the conductive leaf spring 15 is electrically connected to the side electrode 14 by pressing the conductive leaf spring 15 by the protrusion 19 of the button 18, and when the pressing is released, the conductivity is utilized. The restoring force of the leaf spring 15 causes the button 18 to be restored. [Problem to be Solved by the Invention] The switch 10 used in such a mobile phone or other small electronic device has a width of only 3 to 4 mm and a fixed electrode. The thickness is as thin as about 2 mm. Therefore, when the center electrode 13 (2) 1344162 and the side electrode 14 are integrally molded in the plastic molding of the substrate 12, as shown in Fig. 5 (the plastic is poured into the plastic). The resin coating 60 is formed on the substrate 12 and the metal electrode portion. More specifically, as shown in Fig. 5(a), when the gold is subjected to plastic molding at the lower corner portion due to a slight burr edge as shown in Fig. 5(a) There is less resin coverage in the boundary portion A having the metal electrode. However, the contact portion 14 continues to the terminal portion 14a, and the resin covering 60 occurs in the plastic boundary portion B, resulting in the so-called lateral leaf spring 15 The problem of poor contact. In the example shown in Fig. 5(a), since the contact portion 14b is bulged, the amount of the resin cover 60 is higher than the step of bulging the contact portion 14b by compression processing. Small The processing with high precision is extremely high. Here, as shown in Fig. 5(b), if the bending 14b is surely exposed, it is not necessary to perform the above-described compression. However, the plastic substrate 12 is embedded. The boundary line compression processing in the middle produces more resin coverage 60, resulting in a problem of poor contact with the conductive leaf spring 15. The present invention provides a switch that does not require compression processing and is electrically connected, and is a switch. [Means for Solving the Problem] a) or (b) The boundary of the 13 and 14 is the side of the electrode 14, so that the burr of the 14 end is from the substrate 1 2 of the side electrode 14. The side electrode 14 is electrically conductive and less processed by compression, but it is annoying because of the sudden. The processing is performed so that the contact portion is processed so that the processed portion is compared with the so-called side electrode Μ, and the extremely thin opening of the resin electrode can be eliminated. 5-(3) (3) 1344162 The switch according to the present invention is a central electrode which is insert-molded. And the side electrode is mounted in the casing, and the contact piece which is in contact with the side electrode at the end portion and which is in contact with the electrode by the forward and backward movement of the button surface is accommodated in the contact piece housing recess of the casing, and the contact is interposed therebetween. The switch that turns on and off between the center electrode and the side electrode by using the forward and backward movement of the button surface, wherein the side electrode is provided with: a side contact portion that constantly contacts the contact piece; and an integral part from the side contact portion A rising portion that is bent along an inner wall of the contact piece housing recess of the casing. More preferably, the concave portion is formed along the bent portion of the side contact portion and the rising portion. A horizontal portion may be formed by bending the opposite portion of the rising portion and the side contact portion. [Effects of the Invention] According to the first aspect of the patent application, the center electrode and the side electrode are attached to the casing by insert molding, and the end portion is constantly contacted with the side electrode, and the center portion and the above-mentioned center portion are moved forward and backward by the surface of the button. The contact piece that is separated by the electrode is housed in the contact piece housing recessed portion of the casing, and the switch that turns on and off the center electrode and the side electrode by the advancement and retreat operation of the button surface via the contact piece, the side electrode is provided with: a side contact portion that constantly contacts the contact piece; and a rising portion that is integrally bent from the side contact portion along the inner wall of the contact piece housing recess of the case body, so that resin is not generated at the side contact portion of the side electrode Coverage and can improve the on/off performance of the switch. In addition, since the -6-(4) (4) 1344162 riser that is integrally raised from the side contact portion is bent only and does not require compression processing, the switch used for the small electronic device is simple to manufacture and accurate. Changed even higher. According to the second aspect of the patent application, since the concave portion is formed along the bent portion of the side contact portion and the rising portion, the contact area between the side contact portion and the contact piece is increased, and even if the resin flows in from the rising portion side The resin stagnates and prevents the resin from flowing to the side contacts. According to the third aspect of the patent application, since the horizontal portion is formed by bending the opposite edge portion of the rising portion and the side surface contact portion, the resin can be surely prevented from flowing into the resin even when the resin is covered at the upper end portion of the rising portion. The inside of the riser. [Embodiment] [Best Mode for Carrying Out the Invention] In a preferred embodiment of the present invention, the center electrode and the side electrode are mounted in a casing by insert molding, and the end portion is constantly in contact with the side electrode and the button is used. In the forward and backward movement of the surface, the contact piece that is in contact with the electrode at the center portion is housed in the contact piece housing recess of the case, and the center piece and the side electrode are electrically connected and closed by the advancement and retreat operation of the button surface via the contact piece. switch. Further, the side electrode includes a side contact portion that constantly contacts the contact piece, and a rising portion that is integrally bent from the side contact portion along the inner wall of the contact piece housing recess of the case. A concave portion can be formed along the bent portion of the side contact portion and the rising portion. And/or the horizontal portion can be bent at the opposite edge portion (5) (5) 1344162 of the rising portion and the side contact portion. The object of the present invention can be more effectively achieved by this additional configuration. [Embodiment 1] An embodiment of the present invention will be described based on Figs. 1 to 3. In the third diagram (a), the switch 25 of the present invention is a case in which the casing 27 is integrally attached to the center electrode 28 and the side electrode 29 of the casing 27, and is accommodated in the contact piece housing recess 34 of the casing 27. The sheet 30 is composed of a dust-proof sheet 31 covering the front surface of the casing 27, a button surface 32 for pressing the contact sheet 30, and a metal cover 33 for integrally covering the parts. The case 2*7 is made of an insulating material such as plastic, and has a horizontally long contact piece housing portion 34 formed on the front surface, a terminal notch 35 formed at the rear four corner portions, and a combination groove formed on both side surfaces. 36. In the casing 27, the center electrode 28 and the side electrode 29 are integrally molded. As shown in FIG. 3(C), the center electrode 28 has a T-shape formed by the center contact portion 28b and the both terminal portions 28a, and the center contact portion 28b is exposed at the center of the contact piece housing recess 34, and The center portion is bulged, and the terminal portion 28a protrudes from the upper and lower surfaces of the casing 27, and is bent rearward at the terminal notch 35 portion in parallel with the upper and lower surfaces of the casing 27 after molding. The side electrode 29 has the characteristic structure of the present invention, and forms a π-shape with the two side electrodes 29 and the terminal portions 28a integrated therewith at a predetermined interval, and the side contact portions 29b are from the bottom of the contact piece housing recess 34. The end faces of the continuous side walls are exposed in an L shape, and the terminal portions 29a project from the upper and lower surfaces of the casing 27 and are bent rearward in the terminal notches 35 portion in parallel with the upper and lower surfaces -8-(6) (6) 1344162 of the casing 27. A more detailed structure of the above-described side contact portion 29b will be described based on Fig. 2 . In the conventional example shown in Fig. 5 (a) or (b), the contact portion of the side electrode Mb is continuous until the terminal portion 14a is buried in the plastic substrate 110 at the boundary portion b. With respect to this, the basic shape of the side contact portion 29b of the present invention is as shown in Fig. 2(a). When the portion in contact with the fixing piece portion 38 of the contact piece 30 constitutes the horizontal side contact portion 29b, The starting portion 29c is integrally bent into an end surface L-shape. As a result, even if the resin portion 60 is formed at the boundary portion C' of the casing 17 at the upper end of the rising portion 29, it is transmitted to the inner surface of the rising portion 29c without flowing into the upper surface of the side contact portion 29b. . The bending point of the horizontal side contact portion 29b and the rising portion 29c is as shown in Fig. 2(b), and by forming the concave portion 29d, not only the contact area with the fixing piece portion 38 but also the resin is When the rising portion 29c side flows in, the resin can be stagnated and the resin can be prevented from flowing into the upper surface of the side contact portion 29b, and the upper end portion of the rising portion 29c can be bent to form the horizontal portion 29e as shown in Fig. 2(c). Further, even when the resin cover 60 is formed at the upper end portion of the rising portion 29c, it is prevented from flowing into the inner surface of the rising portion 2k. In Figs. 2(a), (b) and 4(c), the end portion A of the horizontal side contact portion 29 is parallel to the bottom of the contact piece housing recess 34, but Fig. 2(d) shows the bending process. A curved buried portion 29f is formed at the end portion A of the horizontal side contact 29b, and is buried in the bottom of the -9 - (7) (7) 1344162 of the contact piece housing recess 34, and the side contact portion 29b is The upper surface is formed to be slightly higher than the bottom of the contact piece housing recess 34. According to such a configuration, the resin covering 60 can be more reliably prevented at the boundary point A. The contact piece 30 is made of a metal plate having a length X width X thickness = 2.6 x 1.2 x 0.06 mm, and is formed into a downwardly facing bowl shape by cutting the rain ditch in the long direction. A movable piece 37 that is curved upward is formed in the center, and a fixing piece 38 that is bent downward is formed on both sides. When the contact piece 30 is housed in the contact piece housing recess 34 of the case 27, the fixing pieces on both sides are fixed. The 38 is placed on the side contact portion 29b of the side electrode 29 to be in constant electrical contact, and the top of the movable piece portion 37 is opposed to the center contact portion 28b of the center electrode 28 with a gap therebetween. The dust-proof sheet 31 is a flexible sheet having an adhesive, and the contact sheet 30 is housed in the contact sheet housing recess 34 of the case 27, and is adhered to the upper end surface of the case 27 with an adhesive. The button surface 32 is made of plastic, metal or the like, and the material is not particularly limited. The button portion 40 protrudes from the front side of the elongated thin plate-shaped guide body portion 39, and the conical pressing projection portion 41 is formed on the rear side. The button surface 32 is disposed such that the pressing protrusion 41 is located at the center of the dust sheet 31. The metal cover 33 is electrically conductive, and is punched and cut into a metal plate having a thickness of about 0.2 mm by a punching machine or the like, and is bent and formed in the center of the front surface portion 42 having substantially the same size as the dustproof sheet 31. The button portion 40 advances and retreats the button through hole 46, and the upper end portion and the lower end portion of the front portion 42 are bent rearward to form the top plate portion 43 and the bottom plate portion 44, respectively, and the front -10- (8) (8) 1344162 Both side portions of the face portion 42 are bent rearward to form the side plate portion 45, respectively. The width of the top plate portion 43 and the bottom plate portion 44 is the width of the guide body portion 39 and the pressing projection portion 41 of the button surface 32 as shown in Fig. 1 . In particular, as shown in FIG. 3, the bottom plate portion 44 is formed with two ridge portions 47 formed in the rear, and the guide main portion 39 of the button surface 32 is placed on the ridge portion 47 to make the surface of the button. The advancement and retreat of 32 is smooth, and a slight gap is formed between the fixed soldering edge 5 1 on the front side of the printed circuit board 26 to be described later to prevent solder flux from overflowing. The side plate portion 45 is formed with a positioning tab portion 48 that faces downward from the side of the bottom plate portion 44. The positioning tab portion 48 may also have a shape extending vertically downward, or may be bent horizontally outward as indicated by a two-dot chain line to form a surface identical to the bottom plate portion 44. The side plate portion 45 is formed into a thin and wide insertion piece 58 in the middle thereof, and can be fitted into the assembly groove 36 of the casing 27, and extended to the rear of the insertion piece 58 to expand the curved piece portion 49. The flared bent piece 49 is bent outwardly and has a projection 57 that is flush with the lower surface of the bottom plate portion 44 at the lower end of the front end portion. The assembly of each component having the above configuration will be described. In the casing 27, the terminal portion 28a of the center electrode 28 and the terminal portion 29a of the side electrode 29 which are integrally molded with the casing 27 are bent or cut upward, and the lower side is bent toward the rear. The contact piece is housed in the front contact piece housing recess 34. The dustproof sheet 31 is adhered to the front surface of the casing 27. The key surface 32 is fitted from the rear of the metal cover 33 so that the key portion 40 protrudes from the key insertion hole 46. Further, the case 27 to which the contact piece 30 and the dust-proof sheet 31 are previously assembled is placed in the metal cover 33 from the rear to overlap the key top plate 32. When the -11 - 1344162 Ο is inserted, since the expanded bending piece 49 of the rear end portion of the side plate portions 45 on both sides is opened outward, the button surface 32 and the case 27 can be smoothly fitted. After the key surface 32 is fitted into the casing 27, the rear end portion of the side plate portions 45 on both sides is expanded and bent in a state in which the top plate portion 42 and the bottom plate portion 44 of the metal cover 33 are in close contact with the dustproof sheet 31. The sheet portions 49 are bent inwardly to complete the assembly of the push button switch 25. At this time, since the expanded bent piece 49 is bent, a slight gap is formed between the rear surface of the case 27 and the back surface of the case 27, and then the bottom plate portion of the metal cover 33 is placed on the printed circuit board 26. The fixed position of 44 is provided with a front fixed welding edge 51, and the positioning holes 50' into which the positioning tab portion 48 is inserted are formed on both sides of the front fixed welding edge 51, and the side fixed welding edge 52 is provided, and is disposed at the center of the rear side. The welding edge 53' is fixed to the rear of the fixing protrusion 57, and the electrode welding edge 54 for electrically connecting the terminal portion 28a and the terminal portion 29a while being fixed to both sides of the rear welding edge 53 is provided. The positioning hole 50 of the printed circuit board 26, the front fixed welded side 51, the side fixed welded side 52, the rear fixed welded side 53, and the electrode welded side 54 are aligned and placed and heated by the respective portions of the push button switch 25. In this manner, the soldering of each of the front fixed welded side 51, the side fixed welded side 52, the rear fixed welded side 53, and the electrode welded side 54 is melted and the push button switch 25 is fixed and electrically connected. At this time, as shown in FIG. 3 and FIG. 1 , the bottom plate portion 44 can be fixed with a large area of the solder 55 even if the thickness of the metal cover 33 is thin, and the solder 5 5 flows into the lower surface of the ridge portion 47 . The gap prevents damage to the flux overflow, and since it can flow more solder 5 5 , it can be firmly fixed -12- (10) (10) 1344162. The positioning tab portion 48 is in a vertical state, and the horizontal position can be positioned by the positioning hole 5, and the side welding edge 52 can be fixed to the solder 55 over a large area. Although the protrusion 57 of the expanded bending piece 49 is fixed to the rear fixing welded side 53 by the solder 55, the gap 56 behind the expanded piece 49 and the back of the case 27 is as shown in Fig. 2, and the solder 55 is caused by Due to the action of the capillary phenomenon, the solder 55 is intruded and fixed to the rear fixed soldering edge 53 over a large area. The terminal portion 28 and the terminal portion 29a are in contact with the electrode portion 54 which is bent downward, and are fixed to the electrode welding edge 54 by a large area by the solder 55. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional side view showing an embodiment of a switch of the present invention. Fig. 2 (a) (b) (c) (d) are cross-sectional views showing different examples of the side electrode 29 of the switch of the present invention, respectively. Fig. 3 is an exploded perspective view showing an embodiment of the switch of the present invention. Fig. 4 is a longitudinal sectional front view of the conventional switch 10. Fig. 5 (a) and (b) are cross-sectional views showing different examples of the various side electrodes 4 of the conventional switch 10. [Description of main component symbols] 1 〇: Push button switch 1 1 : Printed circuit board 12 : Substrate 1 3 : Center electrode 1 4 : Side electrode - 13 - (11) 1344162 1 5 : Conductive leaf spring 1 6 : Spacer 1 7 : Upper cover 1 8 : Button 1 9 : Projection portion 20 : Metal cover 21 : Welding edge 22 for electrode: Welding joint 23 for grounding and fixing: Notch 2 5 : Push button switch 26 : Printed circuit board 27 : Case 28 : Center Electrode 28a: terminal portion
28b :中央接觸部 2 9 :側電極 29a :端子部 2 9b :側接觸部 29c :立起部 29d :凹部 2 9 e :水平部 29f :埋入部 3 0 :接觸片 3 1 :防塵薄片 -14 (12)1344162 32 :按鍵表面 33 :金屬蓋 34:接觸片收納凹部 35 :端子用缺口 3 6 :組裝溝 37 :可動片部 38 :固定片部 39 :導引本體部 40 :鍵鈕部 41 :按壓突起部 42 :前面部 43 :頂板部 44 :底板部 45 :側板部 46 :鍵鈕貫穿孔28b: central contact portion 2 9 : side electrode 29 a : terminal portion 2 9b : side contact portion 29 c : rising portion 29 d : recess portion 2 9 e : horizontal portion 29 f : buried portion 3 0 : contact piece 3 1 : dustproof sheet - 14 (12) 1344162 32: Button surface 33: Metal cover 34: Contact piece housing recess 35: Terminal notch 3 6 : Assembly groove 37: Movable piece 38: Fixing piece 39: Guide body portion 40: Button portion 41 : pressing protrusion 42 : front portion 43 : top plate portion 44 : bottom plate portion 45 : side plate portion 46 : key button through hole
47 :突條部 48 :定位突片部 49 :擴開彎曲片部 5 0 :定位孔 5 1 :前方固定焊接邊 52 :側方固定焊接邊 5 3 :後方固定焊接邊 54 :電極焊接邊 55 :銲錫 -15 (13) (13)134416247: rib portion 48: positioning tab portion 49: expanding the bent piece portion 50: positioning hole 5 1 : front fixed welding edge 52: side fixed welding edge 5 3 : rear fixed welding edge 54: electrode welding edge 55 : Solder-15 (13) (13) 1344162
5 6 :間隙 5 7 ’·突起部 58 :夾入片 60 :樹脂覆蓋 -165 6 : clearance 5 7 '·protrusion 58 : sandwiched sheet 60 : resin covered -16