M377824 五、新型說明： 【新型所屬之技術領域】 本創作係關於一種薄膜電路板結構，尤指一種採用電 容式鍵盤工作原理之薄膜電路板構造。 【先前技術】 如第八圖所示’係一般鍵盤内部的所設的陣列線路 (80)及一與該陣列線路（80)相連接的編碼電路（9〇)，該陣列 線路（80)大致包括複數掃描線s〇〜Sn及複數資料線 〇〇〜On交編成矩陣，而在各掃描線s〇~Sn與各資料線 〇〇~0n跨接處分別設有一接點，當脈衝訊號輪流地送上各 =描線s〇~Sn時，若其中有一接點sw11被接通（上方的 實體按鍵下壓）’則在脈衝訊號由掃描線S1送入時，即透 過接通的接點SW11被送至資料線〇1，如此一來，該編碼 電路（90)即可透過該資料線◦, #得脈衝訊號，進而判讀 出接點sw11的按壓動作。 士然而前述架構卻有出現誤判之可能，例如當使用者同 ^按下位於相鄰對角位置的接點如sw1彳、sw12及SW21 共二個接點按下時，相鄰兩資料線〇1、02上都有訊號送 入’在該等狀況下，編碼電路（9〇)除將判讀接點swi ]、 SW12已接通外，同時亦解讀接點sw21、sw22，共四點接 通亦即出現了一般所稱，，鬼鍵，\解決前述，，鬼鍵”現象的其 種解決方式是在每一個接點上串接一二極體，使訊號 民 I· α 而排除編碼電路（90)的誤判。但既有的陣列線 3 M377824 路（80)都是由薄膜電路板所構成，而薄膜電路板上通常只 是利用銀勝印刷以形成接點及線路，欲在薄臈電路板上安 裝數量龐大的二極體，須付出極大成本，故前述解決方案 不符合經濟效益。 另外一種解決方案是採用電容式鍵盤，此種電容式鍵 盤與生倶來地前述"鬼鍵，，現象具有免疫能力，所謂的電容 '式鍵盤概以電容取代前述陣列線路上的接點，而在實體的 -按鍵下方設有金屬層，當按鍵被按下，與下方的金屬層構 >成-電容’而改變其電容值。由於電容值的變化僅在瞬間 而不持續，故可排除”鬼鍵”現象。但傳統電容式鍵盤之結 構係採用硬質的PC電路板，不僅體積大且成本昂貴，早 已不符產業與市場的需求。 由上述可知，既有用以排除鍵盤上出現，，鬼鍵，，現象的 解決方案，不論是接·點串接二極體或採用電容式鍵盤，在 技術上或成本考量上均有其不可行之處，故有待進一步檢 >討，並謀求更經濟實用且可行的解決方案。 【新型内容】 因此，本創作主要目的在提供一種鍵盤的薄膜電路板 結構，其整合了傳統接點式與電容式鍵盤的工作原理，而 、有鬼鍵的免疫能力；另一方面，其仍可採用既有薄膜 電路板製程’具有低成本、體積小且環保之優點。 、 為達成前述目的採取的主要技術手段係令該薄 板包括： 該表面上形成複數的共同 第薄膜’具有一表面， 4 電極；該共同電極中央為—第—接點電極，周邊為一第一 電容電極； 一第二薄臈，係覆設於第一薄膜上，該第二薄膜具有 -底面，該底面上形成複數的第二電容電極，各第二電容 電極係對應於第一薄膜上的第一電容電極，又第二薄膜在 各第“電谷電極上分別形成一通孔’各通孔係分別對應於 第一薄膜上的第一接點電極； 一第-絕緣層，係、位於S —、第二薄膜之間使二者構 成絕緣狀態’其上的第―、第二電容電極構成一電容；該 第一絕緣層上形成有複數開孔，各開孔分別對應於第二薄 膜上的通孔及第一薄膜上的第一接點電極； 一第二薄膜，係覆設於第二薄膜上，並相對於第一薄 膜：該第三薄膜具有一底面，該底面上形成有複數第二接 點電極，該第二接點電極係對應於第一薄膜上的第一接點 電極； 刖述薄膜式多層電路板在第一薄膜上形成複數的第一 接點電極及第一電容電極，x第二、第三薄膜上則分別形 成第一電容電極及第二接點電極，而分別對應第一薄膜上 的第一電容電極及第一接點電極，並分別構成一電容及一 接點，由於第一薄膜上各成對的第一電容電極及第一接點 電極係形成在一共同電極上，故使前述的電容與接點形同 串聯狀；當前述薄膜電路板設於鍵盤内時，且其上的任一 按鍵被下壓時，將使第三薄膜上的第二接點電極與第一薄 膜上的第一接點電極電接觸，隨即使第一、第二薄膜上與 接點串聯的電容進行充放電，利用電容值的變化供判讀是 勖/7824 否出現按鍵動作。由於前述薄膜電路板的工作原理仍是電 容式，因此可防止出現”鬼鍵”，而其基本架構仍以薄膜電路 板構成，故具有體積小、成本低及易於實現等優點。 為達成前述目的採取的又一技術手段係令該薄膜電路 板包括： 第一薄膜，具有一表面，該表面上形成複數的第一 電極及連接前述各第一電極的線路； 一第二薄膜，具有一底面及一表面，該底面上形成複 數的第二電極，其表面則形成有複數的第三電極，該第二 、第三電極係位於相對應的位置上且構成電連接；又各第 二電極係分別相對於第一薄膜上的第一電極，第一、第二 電極之間具有一絕緣層； 一第三薄膜，具有一底面，該底面上形成複數的第四 電極及連接前述各第四電極的線路；各第四電極係分別相 對於第二薄膜表面之第三電極； -隔離膜，係位於前述第二、第三薄膜之間，該隔離 臈二有#度’其上並形成有複數通孔，各通孔分別對應 於第一、第二薄膜上的第三、第四電極； 前述的薄膜電路板結構，其第一、第二薄膜上每一相 對的第-、第二電極將形成—電容，相對的第2、第四電 極則構成-接點，由於第二薄膜上的第二、第三電極係相 互導通，等同於每一接點分別串接一電容。 【實施方式】 本創作仍 首先請參閱第一圖所示，就電路原理而言 6 M377824 由複數的掃描線S0~Sn及複數的資料線〇㈣n交編組成 :陣列線路，各掃描線SQ~Sn與各f料線〜跨接處 分設-接點sw’每-接點sw又分別串接—電容c(請配合 夕閱第一圖所示），由於接點3抑係與電容◦串接，當按鍵 動作出現’接·點sw將接通’電容c產生充放電，從而可 供判讀該按鍵動作。由上述可知，於本實施例中，該接點 ^為-常開接點，惟對所屬技術領域中具有通常知識者而 言，前述接點sw亦可為一常閉型接點。 為產生前述功能，本創作的第一較佳實施例係如第三 圖所不，主要係、由第一至第三薄膜（1q)(2g)(3q)由下而上依 序疊合所組成；其中： _該第一薄膜（1〇)具有一表面，該表面上形成複數的共 同電極（11)，本實施例中，該共同電極（11)係呈圓形，其 外徑較一般薄膜電路板上的電極尺寸稍大，而令該共同電 ，（11)中央為一第一接點電極（11A)，周邊為環狀的第一電 合電極（11 B)(請配合參閱第四圖所示），除圓形外，該共同 電極⑴）亦可為其他幾何形狀，如矩形等，若為矩形則 其第-電容電極⑴B)可呈一〔形或L形，以上形狀描述 僅為舉例而已，非用以限制其形狀合先陳明；由上述說 明及圖中可以明顯看出，第一接點電極（11A)與第一電容電 極（11 B)就電性上係呈導通狀。 又第一薄膜（1 0)表面進一步形成一第一絕緣層（1 〇〇)， 其可採用印刷方式形成，藉此使第一薄膜（1〇)上的乒同電 沖1)呈絕緣該第—絕緣層（⑽)上形成有複數開孔 (101)，該開孔（101)係對應於第一薄膜（1〇)上的第一接點 7 / un 極（11 A)，其孔經係與第一接點電極（11 的大小匹配， 艮J於第-電容電極⑴8)的外徑意即第一薄膜（叫上 的第電令電極（11 B)係為第一絕緣層（1 00)所覆蓋而構 絕緣。 又 該第二薄膜(20)係覆設於第一薄膜(1〇)上，該第二薄 膜（2〇—)具有—底面，該底面上形成複數第二電容電極（21) ，j貫施例中，進一步於第二薄膜（2〇)的底面形成複數連 接前述第二電容電極（21)的線路（22)，各第：電容電極（21) 係對應於第一薄膜（10)上的第一電容電極（11B)，在第一隔 離層（1〇〇)的絕緣隔離下，第一、第二電容電極（11B)(21) 為平行相對的兩平板，從而構成一電容；又第二薄膜（2〇) 在各第一電容電極（21)上分別形成一通孔（23)，各通孔（23) 係分別對應於第一薄膜（10)上的第一接點電極（11A)，又本 實施例中，該通孔係位於第一電容電極（21)的中央處而使 第一電谷電極（21)呈環狀，又本實施例中，通孔（23)的孔 徑略大於第一絕緣層（100)上的開孔（1〇1)。必須說明的是 :本實施例係將第一絕緣層（1 00)形成在第一薄膜（1〇)的表 面’但對於所屬技術領域具有通常知識者而言，亦可將第 一絕緣層（100)轉換形成在第二薄膜（20)的底面。再者，於 本實施例中’該第二薄膜（20)表面進一步形成有一接地用 的金屬網層（24) ’藉以提供一穩定的電壓位準。另須特別 說明的是：前述金屬網層（24)不必然形成在第一至第三薄 膜（10)(20)(30)上，當前述薄膜電路板設於一鍵盤内，該鍵 盤内設有一接地金屬板’且接地金屬板位於薄膜電路板的 下方，亦可達到提供穩定電壓位準之目的》 «77824 5亥第二薄膜（3〇)係覆設於第二薄膜（20)上，並相對於 第-薄膜(10)，又第三薄膜(30)具有一底自，該底面上形 成有複數第二接點電極(31)，本實施例中，第三薄膜(3⑴ 的底面上進一步形成有複數連接該第二接點電極（31)的線 路（32)及覆蓋該線路（32)的第二絕緣層（33)，亦即第二絕緣 層（33)上形成有複數開口，各開口分別對應於第三薄膜 (3〇)上各個第二接點電極（31)，使該等第二接點電極（31)由 開口處露出；而該第二接點電極（31)係對應於第一薄膜 (10)上的第一接點電極（11A)，從而構成一接點β由於構成 接點之一的第一接點電極（11Α)與第一電容電極（21)係呈導 通狀，因此該接點SW與前述電容c係呈串聯狀態。 月1J述薄膜電路板安裝在一鍵盤内時，且鍵盤上各個按 鍵將分別對應位於前述各個接點及串接電容的上方時，若 鍵盤上有任一按鍵被按下，將使第三薄膜（30)上的第二接 點電極（31)與第一薄膜（1〇>上共通電極（11)中央的第一接點 電極（11Α)電接觸，隨即可使相互串聯的電容產生充放電作 用遂與則述按鍵陣列連接的編碼電路可利用電容值的變 化供判讀是否出現按鍵動作。由於前述薄膜電路板的工作 原理仍是電容式’因此可防止出現”鬼鍵”，而其基本架構 仍以薄膜電路板構成’故具有體積小、成本低及易於實現 等優點。 又本創作的第二較佳實施例係如第五圖所示，主要係 由第一至第二薄膜（4 0)(50)(60)及一位於第二、第三薄膜 (50)(60)之間的隔離膜（70)所組成；其中： 該第一薄膜（40)具有一表面，該表面上形成複數的第 9 M377824 一電極（41)及連接前述各第一電極（41)的線路（43) ^ 又配合參閱第六圖所示，該第二薄膜（5〇)具有一底面 及一表面，該底面上形成複數的第二電極（51),直表面則 μ μ㈣^ f極（52) m三電極（5】）(52)係 位於相對應的位置上且相互構成電連接，其中一種可行的 電連接方式為導通孔；#中，各第二電極(5”係分別相對 於第一薄膜（40)上的第一電極（41)，該第一 '第二電極 (4”(5”之間並進一步形成有一絕緣層而令各相對的第 一、第二電極⑷）(51)分別構成一電容；又前述絕緣層可 形成在第一薄膜（40)及/或第二薄膜（5〇)上於本實施例 中’係於第-薄膜（40)表面形成該絕緣層（42)，以覆蓋各 個第-電極（41)使其構成與第二電極（51)絕緣；對於所屬 技術領域具有通常知識者可以理解的是··該絕緣層㈣可 全面地覆設於第一薄膜(40)的表面，亦可局部地形成於每 -電極（41)上方’於本實施例中’係局部地於各第一電極 (41)上分別覆設一絕緣層（42)。M377824 V. New description: [New technical field] This creation is about a thin-film circuit board structure, especially a thin-film circuit board structure using the working principle of a capacitive keyboard. [Prior Art] As shown in the eighth figure, 'the array line (80) provided inside the general keyboard and the encoding circuit (9〇) connected to the array line (80), the array line (80) is roughly The complex scan lines s〇~Sn and the complex data lines 〇〇~On are interleaved into a matrix, and a contact point is arranged at each of the scan lines s〇~Sn and each data line 〇〇~0n, when the pulse signals are alternately rotated. When the ground is sent to each of the lines s〇~Sn, if one of the contacts sw11 is turned on (the upper physical button is pressed down), then when the pulse signal is sent by the scanning line S1, the contact SW11 is turned on. It is sent to the data line 〇1, so that the encoding circuit (90) can pass the data line ◦, #得脉冲信号, and then judge the pressing action of the contact sw11. However, the foregoing architecture has the possibility of misjudgment. For example, when the user presses the two contacts that are located at the adjacent diagonal positions, such as sw1彳, sw12, and SW21, the two adjacent data lines 〇 1, 02 has a signal sent in 'in these conditions, the encoding circuit (9 〇) in addition to the interpretation of the contact swi], SW12 has been turned on, but also interpret the contacts sw21, sw22, a total of four points That is to say, the general solution, the ghost key, \solve the above, the ghost key phenomenon, the solution is to connect a diode in each contact, so that the signal I · α and eliminate the encoding circuit (90) Misjudgment. However, the existing array line 3 M377824 (80) is composed of a thin film circuit board, and the thin film circuit board usually only uses Yinsheng printing to form contacts and lines, and is intended to be in a thin circuit. The installation of a large number of diodes on the board requires a great deal of cost, so the aforementioned solution is not economical. Another solution is to use a capacitive keyboard, which is the same as the above-mentioned "ghost keys. , the phenomenon has immunity, the so-called capacitance ' The keyboard replaces the contacts on the array lines with capacitors, and a metal layer is placed under the physical-keys. When the buttons are pressed, the metal layer underneath is changed to a capacitor to change its capacitance value. The change of the capacitance value is only in an instant and does not last, so the phenomenon of "ghost key" can be eliminated. However, the structure of the conventional capacitive keyboard is a rigid PC circuit board, which is not only bulky but also expensive, and has long been inconsistent with the needs of the industry and the market. It can be seen from the above that it is useful to eliminate the occurrence of ghosts on the keyboard, ghost key, and the solution of the phenomenon, whether it is a point-to-point serial diode or a capacitive keyboard, it is not feasible in terms of technology or cost. Therefore, it is necessary to further check and seek a more economical and practical solution. [New content] Therefore, the main purpose of this creation is to provide a thin film circuit board structure of a keyboard, which integrates the traditional contact type and Capacitive keyboard works, and has the immune ability of ghost keys; on the other hand, it can still use the existing thin film circuit board process 'has low cost, small size and The main technical means adopted for achieving the above purpose is that the thin plate comprises: a plurality of common first films formed on the surface having a surface, 4 electrodes; the center of the common electrode is a - contact electrode, the periphery a first capacitor electrode; a second thin layer is disposed on the first film, the second film has a bottom surface, the bottom surface forms a plurality of second capacitor electrodes, and each of the second capacitor electrodes corresponds to the first a first capacitor electrode on a film, and a second film respectively forming a through hole on each of the first "electric valley electrodes", each of the through holes corresponding to the first contact electrode on the first film; a first insulating layer, And a second capacitor electrode is formed between the S- and the second film to form an insulating state, wherein the first capacitor and the second capacitor electrode form a capacitor; the first insulating layer is formed with a plurality of openings, and the openings respectively correspond to a through hole on the second film and a first contact electrode on the first film; a second film overlying the second film and opposite to the first film: the third film has a bottom surface, the bottom surface Formed on a plurality of second contact electrodes corresponding to the first contact electrodes on the first film; the thin film type multilayer circuit board forming a plurality of first contact electrodes on the first film and the first The capacitor electrode, the second and third films respectively form a first capacitor electrode and a second contact electrode, and respectively correspond to the first capacitor electrode and the first contact electrode on the first film, and respectively form a capacitor and a contact, since each pair of the first capacitor electrode and the first contact electrode on the first film are formed on a common electrode, so that the capacitor and the contact are formed in series; when the thin film circuit board is provided When the keyboard is pressed, and any button on the button is pressed, the second contact electrode on the third film is electrically contacted with the first contact electrode on the first film, even if the first and second The capacitor connected in series with the contact on the film is charged and discharged, and the change in the capacitance value is used for interpretation. 勖/7824 No button action occurs. Since the working principle of the foregoing thin film circuit board is still capacitive, the "ghost key" can be prevented from being formed, and the basic structure is still composed of a thin film circuit board, so that it has the advantages of small size, low cost, and easy implementation. Another technical means for achieving the foregoing object is that the thin film circuit board comprises: a first film having a surface on which a plurality of first electrodes and a line connecting the first electrodes are formed; and a second film, Having a bottom surface and a surface, the bottom surface is formed with a plurality of second electrodes, the surface of which is formed with a plurality of third electrodes, the second and third electrodes are located at corresponding positions and constitute an electrical connection; The two electrodes are respectively provided with an insulating layer between the first electrode and the second electrode, and a third film has a bottom surface on which a plurality of fourth electrodes are formed and the foregoing a fourth electrode line; each of the fourth electrodes is respectively opposite to the third electrode of the second film surface; - a separator is located between the second and third films, and the isolating layer has a degree of Forming a plurality of through holes respectively corresponding to the third and fourth electrodes on the first and second films; the foregoing thin film circuit board structure, each of the first and second films on the first and the second The two electrodes will form a capacitor, and the opposite second and fourth electrodes constitute a contact. Since the second and third electrodes on the second film are electrically connected to each other, a capacitor is connected in series with each contact. [Embodiment] This creation is still first shown in the first figure. As far as the circuit principle is concerned, 6 M377824 is composed of a plurality of scanning lines S0~Sn and a plurality of data lines 四(4)n: the array lines, the scanning lines SQ~ Sn and each f material line ~ bridging point is set - the contact point sw' each-contact point sw is connected in series - capacitor c (please refer to the first picture shown in the evening), because the contact point 3 and the capacitor string Then, when the button action appears, 'the point sw will be turned on', the capacitor c generates charging and discharging, so that the button action can be interpreted. It can be seen from the above that in the present embodiment, the contact ^ is a normally open contact, but the contact sw can also be a normally closed contact, as is generally known in the art. In order to produce the foregoing functions, the first preferred embodiment of the present invention is as shown in the third figure, mainly by sequentially stacking the first to third films (1q) (2g) (3q) from bottom to top. a composition; wherein: the first film (1〇) has a surface on which a plurality of common electrodes (11) are formed. In this embodiment, the common electrode (11) is circular and has an outer diameter The size of the electrode on the thin film circuit board is slightly larger, so that the common electricity, (11) is a first contact electrode (11A) in the center, and the first electric electrode (11 B) is ring-shaped at the periphery (please refer to the In the four figures, the common electrode (1) may be other geometric shapes, such as a rectangle, etc., and if it is a rectangle, the first capacitor electrode (1) B) may have a shape or an L shape. For the sake of example only, it is not intended to limit the shape thereof; it is obvious from the above description and the figure that the first contact electrode (11A) and the first capacitor electrode (11 B) are electrically Conductive. Further, a surface of the first film (10) is further formed with a first insulating layer (1 〇〇), which can be formed by printing, thereby insulating the ping plate on the first film (1 〇) with the electric punch 1). The first insulating layer ((10)) is formed with a plurality of openings (101) corresponding to the first contact 7 / unpole (11 A) on the first film (1 ,), the holes thereof The meridian is matched to the outer diameter of the first contact electrode (11, and the outer diameter of the first capacitor electrode (1) 8) means that the first film (the first electric electrode (11 B) is the first insulating layer ( The second film (20) is coated on the first film (1), and the second film (2〇) has a bottom surface, and the bottom surface forms a plurality of second In the capacitor electrode (21), in the embodiment, a plurality of lines (22) connecting the second capacitor electrodes (21) are formed on the bottom surface of the second film (2), and each of the capacitor electrodes (21) corresponds to each other. The first capacitor electrode (11B) on the first film (10) is parallel to the first and second capacitor electrodes (11B) (21) under insulation isolation of the first isolation layer (1) a flat plate, thereby forming a capacitor; and a second film (2〇) respectively forming a through hole (23) on each of the first capacitor electrodes (21), and each of the through holes (23) corresponding to the first film (10) The first contact electrode (11A), in this embodiment, the through hole is located at the center of the first capacitor electrode (21) to make the first electric valley electrode (21) ring, and in this embodiment The aperture of the through hole (23) is slightly larger than the opening (1〇1) on the first insulating layer (100). It should be noted that this embodiment forms the first insulating layer (100) on the first film. (1〇) surface 'but for the person having ordinary skill in the art, the first insulating layer (100) may also be formed on the bottom surface of the second film (20). Further, in this embodiment The surface of the second film (20) is further formed with a metal mesh layer (24) for grounding to provide a stable voltage level. It should be particularly noted that the metal mesh layer (24) is not necessarily formed in the first To the third film (10) (20) (30), when the film circuit board is disposed in a keyboard, the keyboard is provided with a ground The metal plate' and the grounded metal plate are located below the thin film circuit board, and can also achieve the purpose of providing a stable voltage level. «77824 5H second film (3〇) is coated on the second film (20), and In the first film (10), the third film (30) has a bottom, and a plurality of second contact electrodes (31) are formed on the bottom surface. In this embodiment, the third film (3) is further formed on the bottom surface. a circuit (32) connected to the second contact electrode (31) and a second insulating layer (33) covering the line (32), that is, a plurality of openings are formed on the second insulating layer (33), and the openings are formed Corresponding to each of the second contact electrodes (31) on the third film (3〇), such second contact electrodes (31) are exposed by the openings; and the second contact electrodes (31) correspond to a first contact electrode (11A) on the first film (10), thereby forming a contact point β; the first contact electrode (11Α) constituting one of the contacts is in conduction with the first capacitor electrode (21) Therefore, the contact SW and the capacitor c are in series. When the thin film circuit board is installed in a keyboard, and the keys on the keyboard are respectively located above the respective contacts and the series capacitors, if any button on the keyboard is pressed, the third film will be made. The second contact electrode (31) on (30) is in electrical contact with the first contact electrode (11Α) in the center of the first film (1〇> common electrode (11), and the capacitors connected in series can be charged. The discharge circuit and the code circuit connected to the button array can use the change of the capacitance value to determine whether the button action occurs. Since the working principle of the thin film circuit board is still capacitive, it can prevent the occurrence of "ghost keys", and the basic The architecture is still constructed of a thin film circuit board, so it has the advantages of small size, low cost, and easy implementation. The second preferred embodiment of the present invention is as shown in the fifth figure, mainly by the first to second films (4). 0) (50) (60) and a separator (70) between the second and third films (50) (60); wherein: the first film (40) has a surface on the surface Forming a plurality of ninth M377824 one electrode (41) and The second film (5〇) has a bottom surface and a surface, and a plurality of second electrodes are formed on the bottom surface (51). ), the straight surface is μ μ (four) ^ f pole (52) m three electrodes (5)) (52) are located at corresponding positions and constitute an electrical connection with each other, one of the feasible electrical connection is a via hole; Each of the second electrodes (5" is opposite to the first electrode (41) on the first film (40), and the first 'second electrode (4' (5" is further formed with an insulating layer for each The opposite first and second electrodes (4)) (51) respectively form a capacitor; and the insulating layer may be formed on the first film (40) and/or the second film (5〇) in the present embodiment. The insulating film (42) is formed on the surface of the first film (40) to cover the respective first electrodes (41) so as to be insulated from the second electrode (51); as will be understood by those of ordinary skill in the art, The insulating layer (4) may be entirely overlaid on the surface of the first film (40), or may be locally formed on each of the electrodes (41) In this embodiment, the 'partially based on the first electrodes (41) each covering an insulating layer (42).
再者該第二薄膜（6〇)具有一底面，該底面上形成複 數的第四電極（61)及連接前述各第㈤電極（61)的線路（62广 各第四電極（61)係分別相對於第二薄膜（5〇)表面之第三電 極（52);而前述第—至第三薄膜（40)(50)(60)上的第一至第 四電極（41)(51 )(52)(61)可為各種不同的形狀，本實施例中 ’該第-至第四電極⑷）(51)(52)(61)係分呈一圓形。 該隔離膜(7〇)具有-厚度，其上並形成有複數通孔 (71) *通孔（71)係分別對應於第二第三薄膜（5q)(6〇)上 的第一第四電極(52)(61)，而利用隔離膜的厚度使第 M377824 三、第四電極（52)(61)呈現常開狀態。 由上述薄膜電路板的結構可以看出，第二、第三薄膜 (50)(60)上呈開路狀的第三、第四電極（52)(61)係構成一常 開接點，第一 ' 第二薄膜（4〇)(50)上的第一、第二電極 (41)(51)則因絕緣層（42)的隔離而等同於一電容再者因第 一溥膜（50)上的第二、第三電極（51 )(52)係呈導通狀，因此 -前述的常開接點與電容係呈串聯狀態。 . 當則述薄膜電路板被安裝在一鍵盤内部時，鍵盤上各 •個按鍵將分別對應位於薄膜電路板上各個接點的上方，一 旦鍵盤上有任一按鍵被按下時，相對下方的第三、第四電 極（52)(61)將會相接觸，而使其二者構成的接點接通，接 著利用第一、第二電極（41)(51)瞬間產生的充放電作用， 作為判讀是否出現按鍵動作的依據。由於其充放電動作係 在很短的時間内完成，因此不會出現所謂的”鬼鍵，，現象。 又請參閱第七圖所示，係本創作第三較佳實施例，其 基本構造與前一實施例大致相同，仍由第一至第三薄膜 (40)(50)(60)及隔離膜（7G)組成，不同處在於：該畴離膜 (7〇)於其中一面上形成有一金屬網層（72)，該金屬網層（72) 係作為接地之用，藉此在第四電極（61)與金屬網層（72)之 間及第一電極（41)與金屬網層（72)之間具有一穩定的電壓 位準，藉此提高訊號的穩定度及判讀的準確性。又前述金 屬網層除可形成在隔離膜（70)上，亦可形成在第一、第二 或第三薄膜（40)(50)(60)上。 【圖式簡單說明】 11 M377824 第:圖：係本創作之電路原理示意圖。 第圖係本創作之陣列線路放大示意圖。 第一圖係、本創作第-較佳實施例的分解圖。 第四圖.係本創作第-較佳實施例的組合剖視圖〇 第五圖係、本創作第二較佳實施例的分解圖。Furthermore, the second film (6〇) has a bottom surface on which a plurality of fourth electrodes (61) and a line connecting the respective (five) electrodes (61) are connected (62 wide fourth electrodes (61) respectively a third electrode (52) opposite to the surface of the second film (5 Å); and first to fourth electrodes (41) (51) on the aforementioned first to third films (40) (50) (60) ( 52) (61) may be of various shapes, and in the present embodiment, the 'the first to fourth electrodes (4)) (51) (52) (61) are in a circular shape. The separator (7〇) has a thickness, and a plurality of through holes (71) are formed thereon. The through holes (71) correspond to the first and fourth portions on the second third film (5q) (6〇), respectively. The electrode (52) (61) is used to make the third and fourth electrodes (52) (61) of the M377824 appear normally open by the thickness of the separator. It can be seen from the structure of the above-mentioned thin film circuit board that the third and fourth electrodes (52) (61) having an open shape on the second and third films (50) (60) constitute a normally open contact, first The first and second electrodes (41) (51) on the second film (4) are equivalent to a capacitor due to the isolation of the insulating layer (42) and the first film (50). The second and third electrodes (51) (52) are electrically connected, so that the aforementioned normally open contact and the capacitor are in series. When the thin film circuit board is mounted inside a keyboard, each button on the keyboard will be respectively located above each contact on the thin film circuit board. Once any button on the keyboard is pressed, the lower side is opposite. The third and fourth electrodes (52) (61) will be in contact with each other, and the contacts formed by the two electrodes are turned on, and then the charge and discharge effects instantaneously generated by the first and second electrodes (41) (51) are used. As a basis for judging whether or not a button action occurs. Since the charging and discharging action is completed in a short time, there is no so-called "ghost key" phenomenon. See also the seventh figure, which is the third preferred embodiment of the present creation, and its basic structure and The former embodiment is substantially the same and still consists of the first to third films (40) (50) (60) and the separator (7G), except that the domain is separated from the film (7〇) on one side thereof. a metal mesh layer (72) for grounding, whereby the fourth electrode (61) and the metal mesh layer (72) and the first electrode (41) and the metal mesh layer ( 72) has a stable voltage level, thereby improving the stability of the signal and the accuracy of the interpretation. The metal mesh layer can be formed on the isolation film (70), and can also be formed in the first and second Or the third film (40) (50) (60). [Simple description of the figure] 11 M377824 P.: Figure: Schematic diagram of the circuit principle of this creation. The figure is an enlarged view of the array line of this creation. An exploded view of the first preferred embodiment of the present invention. FIG. 4 is a cross-sectional view of the combination of the first preferred embodiment of the present invention. FIG fifth line, present an exploded view of the creation of a second preferred embodiment.
係本創作第二較佳實施例的組合刮視圖。 第七圖.係本創作第三較佳實施例的分解圖。 第八圖：係既有鍵盤的電路圖。 【主要元件符號說明】 (10)第一薄膜 (11)共通電極 (11A)第一接點電極 (11 B)第一電容電極 (100)第一絕緣層 (1〇1)開孔 (20)第二薄膜 (21)第二電容電極 (22)(32)(43)線路 (23)通孔 (24)金屬網層 (30)第三薄膜 (31)第二接點電極 (33)第二絕緣層 (40)第一薄膜 (41)第一電極 (42)絕緣層 (43)線路 (50)第二薄膜 (51)第二電極 (52)第三電極 (60)第三薄膜 (61)第四電極 (62)線路 (70)隔離膜 (71)通孔 (72)金屬網層 S0〜Sn掃描線 〜On資料線 12A combined scraping view of the second preferred embodiment of the present invention is created. Figure 7 is an exploded view of a third preferred embodiment of the present creation. Figure 8: A circuit diagram of a keyboard. [Description of main component symbols] (10) First film (11) common electrode (11A) First contact electrode (11 B) First capacitor electrode (100) First insulating layer (1〇1) opening (20) Second film (21) second capacitor electrode (22) (32) (43) line (23) through hole (24) metal mesh layer (30) third film (31) second contact electrode (33) second Insulating layer (40) first film (41) first electrode (42) insulating layer (43) line (50) second film (51) second electrode (52) third electrode (60) third film (61) Fourth electrode (62) line (70) isolation film (71) through hole (72) metal mesh layer S0~Sn scan line ~ On data line 12