A7 ________B7_ 五、發明説明（1 ) 〔發明所屬之技術領域〕 本發明係關於能讓呈偏園形扁平狀的金屬接觸面（可 動接點）在固定接點處連結或分離的小型薄型按鈕開關。 〔先前技術〕 就這種形式的按鈕開關來說，從前的按鈕開關都是廣 泛利用如第6圖所示之構造。前述傳統的按鈕開關，乃是 利用髙精度螺絲圈成形技術，在罩殼1 0的開口部1 0 a 之內底面處露出形成成對的固定接點11、 12的同時， 從這些固定接點11、 12導出的外部接續用端子13、 1 4會露出於罩殻1 0的外壁面所形成。此外，在前面開 口部1 0 a的內側處，收納有能與其中一方的固定接點 1 1經常接觸，而能與另一方的固定接點1 2接觸或分離 、呈偏圓形扁平狀的金屬接觸面1 5 ·另外，由於內面設 置有粘著層的可撓性薄片16貼著於罩殼10的上端面’ 可以蓋.閉住前述開口部1 0 a，因此金靥接觸面1 5會完 全被這個可撓性薄片16覆蓋。 籽浐部中呔^'率而hJ'iA-f合作衫印掣 (請先Μ讀背面之注11^項再填寫本頁) 基於這種^造之下的按鈕開關，雖然沒有圖示’但是 實際裝在回路基板上並且配置在操作體下方，透過這個操 作體的金靥接觸面1 5可以利用手指等被壓下。亦即是’ 透過來自上方的操作力，金屬接觸面1 5的中央部，和可 撓性薄片1 6 —但一同被壓擠撞擊，這個金靥接觸面 1 5會彎曲反轉並且與固定接點1 2相接觸，而兩個固定 接點11、12透過金屬接觸面15因而相互導通，因而 本纸張尺度適用中围國家梯準（CNS } A^L格（2丨0X297公釐） ^ 好浐部中戎«.^·而h.T消费合作ίι印掣 A7 ______B7 ___ 五、發明説明（2 ) 將開關回路由關閉（OFF)的狀態切換至開啓（ON) 的狀態•此外，若是在前述開啓（ON)的狀態下除去來 自上方的操作力，金屬接觸面1 5將會因本身的彈性而恢 復至原本的形狀，從固定接點1 2分離並且使開關回路回 復成關閉（OFF)的狀態，而可撓性薄片1 6也會被推 . » 壓至原先初期的位置。 另外，在上述傳統的按鈕開關中，由於採用的是利用 可撓性薄片1 6來蓋閉罩殻1 0的開口部1 0 a之防塵構 造，塵埃等異物將不容易侵入開口部1 0 a內的接點部位 ，於是，將可減少因異物侵入的起因所造成致使信賴度降 低的情況。 此外，就其它傳統技術來說，也有在罩殻開口部的周 圍設置有鉚合壁，藉由利用該鉚合壁夾鉗住收納於這個開 口部內的金靥接觸面外周部，而省略前述可撓性薄片構造 之按鈕開關案例。 〔發明所欲解決之課題〕 不過，如第6圖所示之前者的一般技術，由於可撓性 薄片1 6內面的粘著層之端面露出於罩殻1 0的周圍，當 這個按鈕開關收納、保管於載體帶（carrier tape )時，將容 易產生超輕量的按鈕開關粘附於載體帶的不良性情況，造 成在實裝作業上無法順利進行的問題·此外，前述之一般 傳統的按鈕開關，其爲了讓可撓性薄片1 6即使貼附於天 面，也不會對金屬接觸面1 5的動作特性產生不良影響， 本紙張尺度適用中國國家標準（CNS ) Α4规格（2丨0X297公釐） — rll·----(装------- 订------Q (讀先Μ讀背面之注f項再填寫本艽) -5 - 輕Μ部中灰«.準Λ於JSA·费合作私，£-^ A7 B7 五、發明説明（3 ) 因此必須在這個可撓性薄片16的內面塗布粘著劑而非接 著劑。但是由於粘著劑所能產生的粘貼強度並不夠，因此 會產生可撓性薄片自罩殼10的上端處剝落的虞慮。 因此，一般如第6圓中虛線所示，也有按鈕開關是採 用將具有開口 1 7 a的金屬薄片1 7鉚合在可撓性薄片 1 6及罩殻1 0的外周部》由於附設這樣的金靥薄片1 7 將會增加零件的件數以及增加組合的工作時間和製成品的 厚度，所以並不能說是促使小型薄型化、降低成本的良好 對策。 另一方面，對於將金屬接觸面的外周部以罩殻的鉚合 壁鉚合住之後者的一般技術來說，由於鉚合條件只要有一 點點的不同，將會對金屬接觸面的動作特性產生巨大的變 化，所以必須要求嚴格的鉚合管理，如此必定會產生使鉚 合工程複雜化，不易提升生產性的問題》此外，前述之= 般按鈕開關，其罩殻開口部由於金屬接觸面的關係而無法 密閉，在按壓操作時，金屬接觸面的周圍會形成空隙而容 易致使塵埃等異物進入該開口部內，因此在防塵性方面也 很難產生功效。 · 〔用以解決課題之手段〕 本發明乃是藉由將整個覆蓋住金屬接觸面至少其外周 部的防止脫落零件以罩殻鉚合住，來廉價提供組裝時及實 裝時具良好作業性、防塵性亦高的小型薄型之按鈕開關· 本紙張尺度適用中國國家揉率（CNS }人4此格{ 210X297公釐} (婧先W讀背面之注f項再填寫本頁) 訂 -6- M·浐部中灰«.準*消费合%社印來 A7 _____B7 五、發明説明（4 ) 〔發明的實施形態〕 本發明之按鈕開關構造簡單的說，乃是由在開口部周 圍設置鉚合壁的罩殻、和露出於前述開口部內底部所形成 之成對的固定按點、以及收納於前述開口部內並且經常與 其中一方的前述固定接點接觸，與另一方的前述固定接點 分離之相對向略呈圓形盤狀之金靥接觸面，以及較這個金 靥接觸面的直徑大，並包覆住該金羼接觸面至少外周部且 備有其自身外周部鉚合於前述鉚合壁，保持固定於前述罩 殼中的防止脫落零件，這個防止脫落零件函蓋前述金屬接 觸面全周而經常與之密接。 例如，在前述防止脫落零件部份持用覆蓋住金羼接觸 面外周部的環狀彈性板，利用將這個環狀彈性板外周部以 罩殼的鉚合壁鉚合住，如能形成函盖這個環狀彈性板內周 部全體而彈接於金饜接觸面外周部的構造是最理想的。如 此一來，由於並非直接鉚合於金屬接觸面，所以不需嚴格 的鉚合管理。此外，因爲環狀彈性板乃是函蓋金靥接觸面 外周部全體，以彈接狀態所覆蓋構成，即使按壓操作金靥 接觸面，亦能與環狀彈性板保持密接狀態，獲得良好的防 塵性。另外，由於並非採用可撓性薄片覆蓋金靥接觸面之 構造，因此即使附設環狀彈性板，也能減少零件數量，且 不妨害小型薄型化。 或者是，在前述防止脫落零件的部份採用覆蓋金屬接 觸面全體，塗有粘著劑的可撓性薄片，將這個可撓性薄片 藉由前述的粘著劑貼著於罩殻之前述開口部周圔及金羼接 本紙張尺度速用中國鬮家揉率< CNS ) A4規格（210X297公釐） I-—rrl·-------L----訂---1-- (餚先閏讀背面之注意事項再4W本頁) A7 _B7 __ 五、發明说明（5 ) 觸面之天面處•如此一來，將覆蓋金屬接觸面的可撓性薄 片乂周部以罩殻的鉚合壁鉚合住的話，可撓性薄片的粘著 劑會露ώ於罩殻周圍而造成貼著於非所希望之處的顧慮。 此外，即使粘著劑的黏貼牢度不強，也能藉由前述的鉚合 壁獲得充分的強度，而不會產生可撓性薄片自罩殻剝離的 顧慮· 〔實施例〕 玆佐以涵面說明本發明的按鈕開關如下： 第1圖係爲本發明之一實施例的按鈕開關非操作時之 斷面圖，第2圖係爲按鈕開關操作時的斷面圖，第3圖係 爲第1圖的要部擴大圖，第4圖係爲第2圖的要部擴大圖 0 如這些圖中所示之按鈕開關，乃是由：小型薄型的連 結器開關、開口部1 a的周圍設置有鉚合壁1 b的罩殻， 和露出於開口部la的內底部，成對的固定接點2、 3, 和由這些固定接點2、 3導出而露出形成於罩殼1外壁面 經濟部中央標丰局負工消费合作社印« (請先W讀背面之注f項再填寫本頁) 的外部連接用端子4、5，和收納於開口部1 a內，可以 和其中一方的固定接點2經常接觸，而與另一個固定接點 3脫離，相對向而略呈圓形盤狀的金靥接觸面6，和較這 個金屬接觸面6直徑大的圓環狀平板，本身內周部呈彈接 狀態而覆蓋住金靥接觸面6的外周部之環狀彈性板7的構 造所形成，這個環狀彈性板7的外周部涵蓋全周而鉚合於 前述鉚合壁1 b中•此外，這個環狀彈性板7牢固地保持 本紙張尺度適用中國國家揉準（CNS ) A4規格（210X297公釐) ' A7 __B7 _ 五、發明説明（6 ) 固定於罩殼1上，而且，藉由這種鉚合，環狀彈性板7就 如第~3圖所示經由若干的彎折而產生下壓，因此其內周部 會涵蓋差周而與金屬接觸面6的外周部彈接。 具有這種構造的按鈕開關，雖然沒有圖示*但可以在 回路基板上配置於資裝的操作體下方，透過這個操作體， . · 可以手指等押下金羼接觸面·亦即是，由來自上方的操作 力（第2圖、第4圖中的箭號）將金屬接觸面6的中央部 按入預定的撞擊處時，這個金靥接觸面6會反轉而與固定 接點3接觸，因此兩固定接點2、 3會透過金靥接觸面6 導通並使開關回路能由關閉（O F F )的狀態切換到開啓 (ON)的狀態。此外，在前述開啓（ON)的狀態中去 除來自上方的操作力，那麼金屬接觸面6會因本身的彈性 回復或原本的形狀，由固定接點3分離並使開關回路回到 關閉（OFF)的狀態· 經濟部中央標隼局工消费含作社印11 (讀先閲讀背面之注意事項再填寫本頁) 又，這個按鈕開關中，環狀彈性板乃是涵蓋金屬接觸 面6外周部全周而在彈接狀態下覆蓋，由於環狀彈性板7 的內周部會跟隨金靥接觸面6的外周部彈性變形而變形’ 因此，如第2圖、第4圖所示，即使按壓操作金屬接觸面 6，仍能與環狀彈性板7的內周部保持密接狀態·所以’ 這能形成不必擔心塵埃等異物會侵入開口部1 a內的防塵 \ 構造之按鈕開關，可以防範接點部位上附著異物的顧慮及 導電不良的情形於未然，得到相當高的信賴性· 此外，這個按鈕開關並非直接鉚合於金屬接觸面6 * 因此即使牢牢固定於環狀彈性板7的外周部也不會對金屬 本紙张尺度適用中國國家標率（CNS ) Λ4規格（2丨0X297公釐） I ! A7 _B7_ 五、發明説明（7 ) 接觸面6的動作特性產生不良影響，所以不必進行嚴格的 管理，而且還能期待因組合性良好而提高生產性》 另冰，這個按鈕開關並非如一般以可撓性薄片覆蓋金 屬接觸面來獲得防塵效果或防止脫落之構造，而是利用覆 蓋金靥接觸面6的外周部之環狀彈性板7來確保防塵機能 « - 與防止脫落機能，因此，雖然附設有環狀彈性板7，零件 數量減少也不會妨害小型薄型化·再加上如同前述的鉚合 條件並不嚴苛，所以能夠降低製造成本。 又，環狀彈性板7爲圓環狀的平板，不須絞扭加工等 之處理，材質也沒有特別限定，所以能夠形成極低廉的售 價。不過，若使用金靥板來作爲環狀彈性板，爲了防止觸 電，最好進行與金屬接觸面6的表面材質相同的處理。 第5圖係爲本發明其它實施例之按鈕開關要部斷面斷 ，其與第1圖〜第4圖相對應的部份則標示相同的符號。 經濟部中决標準局貝工消费合作社印" (請先《讀背面之注意事項再壤寫本頁) 第5圖所示之按鈕開關，乃是由：將覆蓋金屬接觸面 6全體之可撓性薄片8，利用塗設於其內面的粘著層黏貼 於罩殻1開口部1 a的周圍（上端面）與金靥接觸面6之 天面，而且，涵蓋這個可撓性薄片8外周部全周以罩殼1 之鉚合壁1 b加以鉚合所構成。而且’這個按鈕開關並不 會產生可撓性薄片8的粘著層端面（粘著劑）露出於罩殻 . · 1周圍而貼著於非所希r望處之顧慮，亦即是不會有妨害載 體帶貼附的實裝作業。再加上沒有必要追加爲了按壓可撓 性薄片8而設匿的其它零件，因此能夠達到廉價製造且不 會妨害小型薄型化。此外，這個按鈕開關即使其可撓性薄 本紙張尺度讁用中國國家標準（CNS ) A4規格（210X297公嫠） -10- A7 __B7 _ 五、發明説明（8 ) 片8的粘著劑粘貼強度不夠，也能因爲鉚合壁1 b的充分 .鉚合~獲得足夠的強度，因此可撓性薄片8可以確實保持固 定於罩癥1，如此·將不會有可撓性薄片8自罩殼1剝離 ，降低可信賴性之顧慮。 又*由於這個按鈕開關的可撓性薄片8能完全閉盖住 罩殼1之開口部l a，所以防塵性亦高。 〔發明之效果〕 本發明以上述說明之形態實施，使能獲得以下所記載 之效果。 經濟部中央標準局员工消費合作社印« (請先閲讀背面之注意事項再填寫本頁) 只要是在覆蓋金屬接觸面外周部之環狀彈性板外周部 處以罩殻的鉚合壁加以鉚合，而涵蓋這個環狀彈性板內周 部並彈接於金屬接觸面之外周部的構造，就不需要嚴格的 鉚合管理，而且亦能提高防塵性*或者是，在覆蓋金屬接 觸面全體的可撓性薄片之外周部處以罩殻的鉚合壁加以鉚 合，而將這個可撓性薄片粘貼在罩殻開口部周圍及金靥接 觸面之天面上的構造形態，將不會產生可撓性薄片的粘著 劑露出於罩殻周圍而粘著於非所希望處之顧慮，也不會有 可撓性薄片自罩殻剝離的顧慮•總而言之，藉由組裝時或 實裝時的良好作業性，和更高的防塵效果，以及能夠減少 零件數量等之事項，將可以低價提供信賴度高且小型薄型 的按鈕開關· 〔圖面之簡單說明〕 本紙張尺度適用中國國家揉準（CNS ) A4規格（210X297公釐）~： ~ 388045 a? B7 五、發明説明（9) 第1圖係爲本發明之按鈕開關的一實施例所示的非操 作時~斷面圖。 (請先閱讀背面之注意事項再填寫本頁) 第2圖係爲該按鈕開關操作時之斷面圖。 第3圖係顯示第1圖的要部擴大圖。 第4圖係顯示第2圖的要部擴大圖。 第5圖係本發明之按鈕開關的其它實施例所示的要部 斷面圖》 第6圖係顯示一般傳統的按鈕開關的斷面圖。 〔圖號說明〕 1 :罩殼 1 a :開口部 1 b :鉚合壁 2，3 :固定接點 6 :金屬接觸面 7 :環狀彈性板 8 :可撓性薄片 經濟部中央椋準局負工消费合作社印裝 本紙張尺度適用中國國家揉準（CNS)A4规格（210X297公釐） -12-A7 ________B7_ V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a small, thin push-button switch that enables a flat metal contact surface (movable contact) to be connected or separated at a fixed contact. . [Prior Art] As for this type of push button switch, the conventional push button switch has widely used the structure shown in Fig. 6. The aforementioned conventional push button switch uses the 髙 precision screw ring forming technology to expose the pair of fixed contacts 11 and 12 at the inner bottom surface of the opening portion 10 a of the housing 10, and from these fixed contacts The external connection terminals 13, 14 derived from 11, 12 are formed on the outer wall surface of the cover 10. In addition, at the inner side of the front opening portion 10 a, a flat circular shape is accommodated, which can be in constant contact with one of the fixed contacts 11 and can be in contact with or separated from the other fixed contact 12. Metal contact surface 1 5 · In addition, since the flexible sheet 16 provided with an adhesive layer on the inner surface is attached to the upper end surface of the casing 10, it can be covered. The opening 10 a is closed, so the metal contact surface 1 5 will be completely covered by this flexible sheet 16.浐 率 'rate in the seed part and hJ'iA-f collaboration shirt printing (please read the note 11 ^ on the back before filling out this page) Based on this button switch, although not shown' However, the circuit board is actually mounted on the circuit board and is arranged below the operating body. The gold contact surface 15 passing through the operating body can be pressed down with a finger or the like. That is, 'through the operating force from above, the central part of the metal contact surface 15 and the flexible sheet 16 — but being squeezed and impacted together, the gold contact surface 15 will bend and reverse and be fixedly connected. Point 12 is in contact with each other, and the two fixed contacts 11 and 12 are connected to each other through the metal contact surface 15. Therefore, this paper size is applicable to the national standard of China (CNS} A ^ L grid (2 丨 0X297 mm) ^浐 部 中 戎 «. ^ · And hT consumer cooperation 印 Indian A7 ______B7 ___ V. Description of the invention (2) Switch the switching circuit from OFF to ON state. • In addition, if the above When the operating force from above is removed in the ON state, the metal contact surface 15 will return to its original shape due to its elasticity. It will be separated from the fixed contact 12 and the switch circuit will return to the OFF state. State, and the flexible sheet 16 will be pushed. »Press to the original initial position. In addition, in the above-mentioned conventional push button switch, because the flexible sheet 16 is used to cover the cover 10 The dust-proof structure of the opening part 10 a prevents foreign matter such as dust The contact points in the opening portion 10 a are easily penetrated, so that the reduction in reliability caused by the invasion of foreign matter can be reduced. In addition, in other conventional technologies, it is also provided around the opening portion of the casing. There is a riveted wall, and by using the riveted wall clamp to clamp the outer peripheral portion of the metal contact surface accommodated in this opening, the case of the button switch with the flexible sheet structure described above is omitted. [Problems to be Solved by the Invention] However As shown in FIG. 6, the former general technology, because the end face of the adhesive layer on the inner surface of the flexible sheet 16 is exposed around the cover 10, when this button switch is stored and stored on a carrier tape ), It is easy to cause the problem that the ultra-lightweight push button switch adheres to the carrier tape, which causes a problem that the installation cannot be smoothly performed. In addition, the aforementioned conventional push button switch is designed to be flexible. Even if the sheet 16 is affixed to the sky, it will not adversely affect the operating characteristics of the metal contact surface 15. This paper size applies the Chinese National Standard (CNS) Α4 specification (2 丨 0X297) ） — Rll · ---- (install ------- order ------ Q (read the first f of the back and read the f), and then fill in this book) -5-light gray in the middle of the light «. Associated with JSA · Faith, £-^ A7 B7 V. Description of the invention (3) Therefore, it is necessary to apply an adhesive instead of an adhesive on the inner surface of this flexible sheet 16. However, due to the adhesive can produce The adhesive strength is not enough, so there is a concern that the flexible sheet peels off from the upper end of the casing 10. Therefore, as shown by the dashed line in the sixth circle, some button switches are also made of metal with an opening 17a Sheet 17 is riveted to the outer periphery of flexible sheet 16 and cover 10. Since the attachment of such a gold foil sheet 17 will increase the number of parts, increase the combined working time and the thickness of the finished product, so It cannot be said that it is a good countermeasure to promote miniaturization and reduction in cost. On the other hand, with the general technique of riveting the outer peripheral portion of the metal contact surface with the riveting wall of the casing, as long as the riveting conditions are slightly different, the operating characteristics of the metal contact surface will be affected. There are huge changes, so strict management of riveting must be required. This will inevitably cause problems that complicate the riveting process and it is not easy to improve productivity. In addition, the aforementioned = general button switch, the opening of the cover due to the metal contact surface It cannot be sealed because of the relationship between them. During the pressing operation, a gap is formed around the metal contact surface and foreign matter such as dust can easily enter the opening. Therefore, it is difficult to produce efficacy in terms of dust resistance. · [Means to solve the problem] The present invention is to provide good workability during assembly and installation at low cost by riveting the anti-falling parts covering the entire metal contact surface at least the outer peripheral portion of the metal contact surface with a cover. 、 Small and thin push button switch with high dust resistance · This paper size is applicable to China's national kneading rate (CNS} person 4 this box {210X297 mm} (Jing W first read the note f on the back before filling this page) Order -6 -M · 浐 中 中 灰 «. Quasi * consumer cooperative company printed A7 _____B7 V. Description of the invention (4) [Inventive embodiment] The structure of the push button switch of the present invention is simply provided around the opening The cover of the riveted wall, the pair of fixed pressing points formed on the bottom of the opening, and the fixed openings that are accommodated in the opening and often contact one of the fixed contacts and the other fixed contact The separated, relatively circular disk-shaped gold ridge contact surface is larger in diameter than this gold ridge contact surface and covers at least the outer periphery of the gold ridge contact surface and is provided with its own outer periphery riveted to the aforementioned Riveted wall to keep solid The anti-falling part, which is fixed in the casing, covers the entire circumference of the metal contact surface and is often in close contact with it. For example, the ring-shaped part covering the outer periphery of the contact surface of the gold tincture is held in a ring shape. The elastic plate is formed by riveting the outer peripheral portion of the annular elastic plate with the riveting wall of the shell. If the inner peripheral portion of the annular elastic plate can be formed and covered with the outer peripheral portion of the gold contact surface, The most ideal. In this way, since it is not directly riveted to the metal contact surface, strict riveting management is not required. In addition, the ring-shaped elastic plate covers the entire outer periphery of the contact surface of the metal ring, and is in the state of spring connection. The covered structure can maintain a tight contact with the ring-shaped elastic plate even if the contact surface of the metal ring is pressed, and obtain good dust resistance. In addition, the structure of the metal ring contact surface is not covered with a flexible sheet, so even if a ring is attached The shape of the elastic plate can also reduce the number of parts, and does not hinder the miniaturization and thinning. A flexible sheet of an adhesive. The flexible sheet is attached to the opening portion of the cover by the aforementioned adhesive, and the metal sheet is attached to the paper. Quickly use the Chinese standard of rubbing rate < CNS ) A4 specification (210X297mm) I --- rrl · ------- L ---- Order --- 1-- (read the precautions on the back first and then the 4W page) A7 _B7 __ 5 2. Description of the invention (5) At the contact surface • In this way, if the peripheral portion of the flexible sheet covering the metal contact surface is riveted with the riveting wall of the cover, the adhesive for the flexible sheet Will be exposed around the cover and cause concerns about undesired places. In addition, even if the adhesiveness of the adhesive is not strong, sufficient strength can be obtained by the aforementioned riveting wall without causing concerns about the peeling of the flexible sheet from the casing. [Example] Zizou Yihan The push button switch of the present invention is described as follows: FIG. 1 is a cross-sectional view of a push-button switch in an embodiment of the present invention when it is not in operation, FIG. 2 is a cross-sectional view of a push-button switch in operation, and FIG. The enlarged view of the main part of Fig. 1 and the enlarged view of Fig. 4 are the enlarged parts of Fig. 2 The button switch shown in these figures is composed of a small and thin connector switch and the opening 1 a A cover provided with a riveted wall 1 b, and a pair of fixed contacts 2 and 3 exposed at the inner bottom of the opening la, and exposed from these fixed contacts 2 and 3 are formed on the outer wall surface of the cover 1 The Ministry of Economic Affairs Central Standards Bureau Bureau of Work and Consumer Cooperatives printed «(please read the note f on the back side and fill in this page first), the external connection terminals 4, 5 are stored in the opening 1 a, and can be used with one of them The fixed contact 2 is often in contact with, but separated from the other fixed contact 3, and has a slightly circular disk shape facing each other. The metal ring contact surface 6 and the ring-shaped flat plate having a larger diameter than the metal contact surface 6 are formed by a structure of a ring-shaped elastic plate 7 that covers the outer periphery of the metal ring contact surface 6 in a resilient state. The outer peripheral portion of this annular elastic plate 7 covers the entire periphery and is riveted in the aforementioned riveting wall 1 b. In addition, this annular elastic plate 7 firmly maintains the paper size and applies the Chinese National Standard (CNS) A4 specification ( 210X297 mm) 'A7 __B7 _ V. Description of the invention (6) It is fixed on the cover 1 and, by this riveting, the ring-shaped elastic plate 7 is bent as shown in Figs. Since a depression is generated, the inner peripheral portion of the metal contact surface 6 covers the difference and elastically contacts the outer peripheral portion of the metal contact surface 6. The push button switch with this structure, although not shown in the figure, can be placed on the circuit board under the installed operating body. Through this operating body, you can use your fingers to hold down the gold contact surface. That is, from the When the upper operating force (arrows in Figs. 2 and 4) presses the center of the metal contact surface 6 into a predetermined impact point, the metal contact surface 6 will reverse and contact the fixed contact 3, Therefore, the two fixed contacts 2 and 3 are conducted through the metal contact surface 6 and the switch circuit can be switched from an OFF state to an ON state. In addition, when the operating force from above is removed in the aforementioned ON state, the metal contact surface 6 will be restored by its own elasticity or its original shape, and the fixed contact 3 will be separated and the switch circuit will be returned to OFF. State of the Ministry of Economic Affairs, Central Bureau of Standards, Consumer Consumption, including the seal of the company 11 (read the precautions on the back, and then fill out this page). In this button switch, the ring-shaped elastic plate covers the entire outer surface of the metal contact surface 6 It is covered in the elastic state all the time, because the inner peripheral portion of the ring-shaped elastic plate 7 is deformed and deformed following the outer peripheral portion of the contact surface 6 of the gold ring. Therefore, as shown in FIG. 2 and FIG. The metal contact surface 6 can still be in close contact with the inner peripheral portion of the ring-shaped elastic plate 7. Therefore, 'This can form a dust-proof switch that does not have to worry about foreign matter such as dust entering the opening 1a, and can prevent contact Concerns about foreign matter adhering to the part and poor electrical conductivity have been obtained beforehand, and have obtained a high degree of reliability. In addition, this push button switch is not directly riveted to the metal contact surface 6 * Therefore, even if it is firmly fixed to the ring-shaped elastic plate The outer part of 7 will not adversely affect the application of the Chinese National Standard (CNS) Λ4 specification (2 丨 0X297 mm) of the metal paper size. I! A7 _B7_ V. Description of the invention (7) The operating characteristics of the contact surface 6, Therefore, strict management is not necessary, and productivity can be expected to be improved due to good combination. In addition, this button switch is not a structure that covers the metal contact surface with a flexible sheet to obtain a dustproof effect or prevent it from falling off. The ring-shaped elastic plate 7 covering the outer periphery of the metal contact surface 6 is used to ensure the dustproof function «-and to prevent the fall-off function. Therefore, although the ring-shaped elastic plate 7 is attached, the reduction in the number of parts does not hinder the miniaturization and thinning. In addition, as the aforementioned riveting conditions are not severe, manufacturing costs can be reduced. Further, the annular elastic plate 7 is a circular flat plate and does not need to be subjected to twisting or the like, and the material is not particularly limited, so that it can be formed at a very low price. However, if a gold plate is used as the ring-shaped elastic plate, in order to prevent electric shock, it is preferable to perform the same treatment as the surface material of the metal contact surface 6. FIG. 5 is a cross-section of a main part of a push button switch according to another embodiment of the present invention, and the parts corresponding to FIGS. 1 to 4 are marked with the same symbols. Printed by Shelley Consumer Cooperatives of the Bureau of Standards and Decisions of the Ministry of Economic Affairs (please read the precautions on the back and write this page first) The button switch shown in Figure 5 is to cover the entire metal contact surface 6 The flexible sheet 8 is adhered to the surrounding surface (upper end surface) of the opening 1 a of the casing 1 and the contact surface 6 of the gold tint with an adhesive layer applied on the inner surface thereof, and the flexible sheet 8 is covered. The outer periphery is formed by riveting the riveting wall 1 b of the cover 1 over the entire periphery. And 'This push button switch does not cause the end face (adhesive) of the adhesive layer of the flexible sheet 8 to be exposed to the housing. · 1 The concern that it is close to the undesired side, that is, it will not There is an obstacle to the mounting operation of the carrier tape. In addition, it is not necessary to add other parts for pressing the flexible sheet 8, so that it can be manufactured at low cost without hindering downsizing. In addition, this push button switch uses the Chinese National Standard (CNS) A4 specification (210X297 cm) even if it has a thin flexible paper. -10- A7 __B7 _ V. Description of the invention (8) Adhesive strength of the adhesive of sheet 8 Insufficient, because the riveting wall 1 b is sufficient. Riveting ~ to obtain sufficient strength, so the flexible sheet 8 can be surely fixed and fixed to the mask 1, so that there will be no flexible sheet 8 from the cover 1 peeling, concerns about reducing reliability. Also, since the flexible sheet 8 of this push button switch can completely close and cover the opening la of the cover 1, it is also highly dust-proof. [Effects of the Invention] The present invention is implemented in the form described above, so that the effects described below can be obtained. Printed by the Consumers' Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs «(Please read the precautions on the back before filling out this page) As long as the outer peripheral portion of the ring-shaped elastic plate covering the outer peripheral portion of the metal contact surface is riveted with a shell riveting wall, The structure that covers the inner peripheral portion of this annular elastic plate and is elastically connected to the outer peripheral portion of the metal contact surface does not require strict riveting management, and can also improve dust resistance *. Or, it can cover the entire metal contact surface. The outer periphery of the flexible sheet is riveted by the riveting wall of the cover, and the structure in which this flexible sheet is pasted around the opening of the cover and on the sky surface of the contact surface of the gold ridge will not produce flexibility. There is no concern that the adhesive of the flexible sheet is exposed around the cover and adheres to the undesired place, and there is no concern that the flexible sheet is peeled from the cover. In short, by good work during assembly or installation And higher dust-proof effect, and can reduce the number of parts, etc., will provide reliable and small and thin push-button switches at a low price. [Simplified description of the drawing] National Standard (CNS) A4 (210X297 mm) ~: ~ 388045 a? B7 V. Description of the invention (9) Figure 1 shows the non-operating time of the push button switch according to an embodiment of the present invention. Face view. (Please read the precautions on the back before filling out this page.) Figure 2 is a sectional view of the button switch when it is operating. Fig. 3 is an enlarged view showing the main part of Fig. 1. FIG. 4 is an enlarged view of the main part of FIG. 2. Fig. 5 is a sectional view of a main part shown in another embodiment of the push button switch of the present invention. Fig. 6 is a sectional view showing a conventional push button switch. [Illustration of drawing number] 1: cover 1 a: opening 1 b: riveted wall 2, 3: fixed contact 6: metal contact surface 7: annular elastic plate 8: flexible sheet Central Ministry of Economic Affairs The paper size of printed papers for consumer cooperatives is applicable to the Chinese National Standard (CNS) A4 (210X297 mm) -12-