.201021067 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種按鍵面板結構，尤其涉及一種薄膜 型按鍵面板結構。 【先前技術】 隨著資訊科技之迅速發展，電子裝置如行動電話等朝 著輕薄短小之方向發展，如此薄膜型按鍵面板應運而生。 習知之薄膜型按鍵面板通常包括一按壓表層、一按壓 底層及一圖案層。該圖案層係按鍵標識，如按鍵數位等， 其藉由網印製程將多層油墨印刷於一片材上而成。該按壓 表層、按壓底層及圖案層藉由黏貼或熱壓一體成型。 網印製程通常需要達到兩個目的：一係要使得該薄膜 型按鍵面板之按鍵標識清晰可辨；二係要使得使用者不能 透過該薄膜型按鍵面板而看到電子裝置之内部電子元件。 也就係說’該薄膜型按鍵面板不透明，但於按鍵標識處具 ❹備透光性。如此，該薄膜型按鍵面板需印刷至少兩層油膜 層’其製造過程相對複雜，$，還增加了油墨層之間色澤 之搭配精度，降低了產品之良率。 【發明内容】 蓉於上述内容’有必要提供一種能夠簡化網印製 按鍵面板結構。 -種按鍵面板結構’包括依次堆疊成一體之一按 層、-圖案層及-按壓底層，該圖案層包括一片材及 成於該片材之油墨層，所述片材採用具透光性之不透明材 6 .201021067 質。 . 相較於習知技術，所述按鍵面板結構藉由採用該不透 ^ 明但透光性好之片材，從而省去了習知網印過程中需印刷 一層不透明但透光性好之油墨層，如此只需藉由一道印刷 制程來印刷一層透光性差之油墨層或不透光油墨層於該片 材上即可，如此簡化了網印製程，並簡化了油墨層之間色 澤之搭配，提升了產品之良率。 【實施方式】 ® 請參閱圖1及圖2,本發明較佳實施例電子裝置之按 鍵面板結構10，包括一按壓表層11、一圖案層12、一第 一背膠層13、一彈性層14、一第二背膠層15、一導光層 16、一第三背膠層17及一按壓底層18。 所述按壓表層11由透明且具有彈性之熱塑性高分子 材料製成，如熱塑聚胺醋（Thermoplastic Polyurethane， TPU)。該按壓表層11為薄片結構，其表面形成有複數按 ❿鍵輪廓111。該複數按鍵輪廓111於該按壓表層11之相對 位置用以確定形成於所述按鍵面板結構10上之各按鍵之 相對位置。 所述圖案層12位於所述按壓表層11下方，其包括一 不透明但透光性好之片材121及一油墨層122。 所述片材121之材質可以為丙烯腈-丁二烯-苯乙烯共 聚物（Acrylonitrile Butadiene Styrene，ABS)和聚碳酸酉旨 (Polycarbonate，PC)之混合物，也可以為經過霧面處理 或鍍膜處理之熱塑性高分子材料，如聚碳酸酯 7 .201021067 (Polycarbonate，PC )或對苯二甲酸二乙烯脂樹脂 (Polyethylene terephathalate，PET )。霧面處理係藉由玻璃 砂或紫外光固化謬（Ultraviolet Rays, UV)塗布於熱塑性 高分子材料之表面上。丙烯腈_丁二烯_苯乙烯共聚物和聚 碳酸酯之混合物呈現乳白色，其不透明但透光性較好。同 樣，經過霧面處理或鍍膜處理之聚碳酸酯或對苯二甲酸二 乙烯脂樹脂也不透明但透光性較好。該片材121之尺寸與 該按壓表層U之尺寸大致相當，其與該按壓表層u熱壓 成型為一體。 所述油墨層122為單層透光性差之油漆或不透光油 漆該透光性差之油漆或不透光油漆塗布於該片材121上 以形成所述按鍵標識123。 所述第背膠層13大致為矩形狀之透明雙面黏膠 層，用於將該圖案層12黏接於該彈性層14上。 所述彈性層14為一透明且具有彈性之熱塑性高分子 ❿，料製成，如熱塑聚胺酯。該彈性層14之尺寸與所述第一 走膠層13之尺寸大致相當，其底面形成有複數抵持體 141用於抵持按壓底層18。 所述第二背膠層15為一透明之雙面黏膠層。該第二背 15為一框形結構’其具有一週邊151及由該週邊i5i 圍成之-通槽152。該第一背膠層13及彈性層14容置於 s、槽152内，同時，該週邊151之一面黏結於圖案層u 上，另一面黏結於電子裝置之殼體（未圖示）上。 所述導光層16之尺寸與該彈性層14之尺寸大致相 8 .201021067 當，用於導引從按鍵面板結構111之底部發散出之光線到 . 按鍵標識123上。 ， 所述第三背膠層17為複數透明之雙面黏膠層，用於將 該導光層16黏結於該按壓底層18上。 所述按壓底層18由熱塑性之高分子材料製成，如聚碳 酸酯或對苯二甲酸二乙烯脂樹脂。該按壓底層18之一面凸 "又有複數凸起181，用於按壓電路板上之觸點以實現電路 之導通與斷開。 Ο 組裝該按鍵面板結構10時，首先將印刷有油墨層122 之片材121與該按壓表層n熱壓成型為一體；然後將彈性 層14藉由第一背膠層13黏結於該片材121之中間區域； 隨後將導光層16藉由第三背膠層17黏結於該按壓底層18 上；最後將片材121之週邊藉由第二背膠層15黏結於電子 裝置上，此時該導光層16及按壓底層18固定於該第二背 膠層15與電子裝置之間，該彈性體14藉由第二背膠層15 ❿之通槽152與按壓底層18相抵接，如此該按壓表層u、 圖案層12、彈性層14、導光層16及按壓底層切依序堆疊 於一起從而將該按鍵面板結構ln上組裝完畢。 使用該按鍵面板結構1〇時，只需按壓按鍵表層^之 按鍵輪廓πι，該彈性體14之抵持體141對應地按壓該按 壓底層18之凸起181，該凸起181隨之按壓電路板上之觸 •點以實現電路之導通與斷開。該彈性層14之抵持體ΐ4ι 具有彈性’起到緩衝抵觸之過程，使得用戶不會感覺到明 頌之抵觸感而獲得較佳之觸感。該按鍵面板結構1〇之片材 9 .201021067 12^透明但透光性好，如此—方面使得該按鍵面板10之 按鍵標識123清晰可辨’另—方面使得使用者不能透過該 按鍵面板10看到電子裝置内之電子元件。 所述按鍵面板結才冓10藉由採用該不透明但透光性好 之片材121 ’從而省去了網印過程中印刷一層不透明但透 光性好之油墨層，簡化了網印製程，並降低了成本，並簡 化了油墨層之間色澤之搭配，提升了產品之良率。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key panel structure, and more particularly to a film type key panel structure. [Prior Art] With the rapid development of information technology, electronic devices such as mobile phones have developed in a light, short, and short direction, and such a film-type button panel has emerged. Conventional film type button panels generally include a pressing surface layer, a pressing bottom layer, and a pattern layer. The pattern layer is a button identifier, such as a button digit, etc., which is formed by printing a plurality of layers of ink on a sheet by a screen printing process. The pressing surface layer, the pressing bottom layer and the pattern layer are integrally formed by adhesion or hot pressing. The screen printing process usually needs to achieve two purposes: one is to make the button marking of the film type button panel clear and legible; the second is to prevent the user from seeing the internal electronic components of the electronic device through the film type button panel. In other words, the film type button panel is opaque, but it has transparency in the button mark. In this way, the film type button panel needs to print at least two oil film layers. The manufacturing process is relatively complicated, and the color matching accuracy between the ink layers is increased, thereby reducing the yield of the product. SUMMARY OF THE INVENTION It is necessary to provide a structure for simplifying the screen printing of a button panel. - a button panel structure 'comprising one layer in sequence, one layer, one pattern layer and one pressing layer, the pattern layer comprising a sheet of material and an ink layer formed on the sheet, the sheet being light transmissive The opaque material 6.201021067 quality. Compared with the prior art, the button panel structure adopts the sheet which is not transparent but has good light transmittance, thereby eliminating the need to print a layer of opaque but good light transmission during the conventional screen printing process. The ink layer can be printed on a single light-transmissive ink layer or an opaque ink layer by a printing process, which simplifies the screen printing process and simplifies the color between the ink layers. Matching, improve the yield of the product. 1 and 2, a key panel structure 10 of an electronic device according to a preferred embodiment of the present invention includes a pressing surface layer 11, a pattern layer 12, a first backing layer 13, and an elastic layer 14. a second adhesive layer 15, a light guiding layer 16, a third adhesive layer 17, and a pressing bottom layer 18. The pressing surface layer 11 is made of a transparent and elastic thermoplastic polymer material such as Thermoplastic Polyurethane (TPU). The pressing surface layer 11 has a sheet structure, and its surface is formed with a plurality of 按 key contours 111. The plurality of key contours 111 are positioned relative to the pressing surface layer 11 to determine the relative positions of the keys formed on the key panel structure 10. The pattern layer 12 is located below the pressing surface layer 11, and includes an opaque but light transmissive sheet 121 and an ink layer 122. The material of the sheet 121 may be a mixture of Acrylonitrile Butadiene Styrene (ABS) and Polycarbonate (PC), or may be matte or coated. A thermoplastic polymer material such as polycarbonate 7.201021067 (Polycarbonate, PC) or a polyethylene terephathalate (PET). The matte treatment is applied to the surface of the thermoplastic polymer material by means of glass sand or ultraviolet ray (Ultraviolet Rays, UV). The mixture of acrylonitrile-butadiene-styrene copolymer and polycarbonate exhibits milky white color, which is opaque but has good light transmission. Similarly, the polycarbonate or the vinyl terephthalate resin which has been subjected to matte treatment or coating treatment is also opaque but has good light transmittance. The sheet 121 has a size substantially equivalent to the size of the pressing surface layer U, and is thermoformed integrally with the pressing surface layer u. The ink layer 122 is a single layer of poorly transmissive paint or opaque paint. The poorly transmissive paint or opaque paint is applied to the sheet 121 to form the button mark 123. The backing layer 13 is a substantially rectangular transparent double-sided adhesive layer for bonding the pattern layer 12 to the elastic layer 14. The elastic layer 14 is a transparent and elastic thermoplastic polymer, such as a thermoplastic polyurethane. The elastic layer 14 has a size substantially equivalent to that of the first adhesive layer 13, and a plurality of resisting members 141 are formed on the bottom surface thereof for resisting pressing of the bottom layer 18. The second adhesive layer 15 is a transparent double-sided adhesive layer. The second back 15 is a frame-shaped structure having a periphery 151 and a through groove 152 surrounded by the periphery i5i. The first adhesive layer 13 and the elastic layer 14 are received in the s and the grooves 152. At the same time, one side of the periphery 151 is adhered to the pattern layer u, and the other surface is adhered to the casing (not shown) of the electronic device. The size of the light guiding layer 16 is substantially the same as the size of the elastic layer 14. When used to guide the light emitted from the bottom of the button panel structure 111 to the button mark 123. The third adhesive layer 17 is a plurality of transparent double-sided adhesive layers for bonding the light guiding layer 16 to the pressing bottom layer 18. The pressing underlayer 18 is made of a thermoplastic polymer material such as a polycarbonate or a vinylene terephthalate resin. The pressing bottom layer 18 has a convex surface and a plurality of protrusions 181 for pressing the contacts on the circuit board to turn on and off the circuit.组装 When the button panel structure 10 is assembled, the sheet 121 printed with the ink layer 122 is first thermoformed integrally with the pressing surface layer n; then the elastic layer 14 is bonded to the sheet 121 by the first adhesive layer 13 The intermediate portion; the light-guiding layer 16 is then adhered to the pressing layer 18 by the third adhesive layer 17; finally, the periphery of the sheet 121 is bonded to the electronic device by the second adhesive layer 15, at this time The light guiding layer 16 and the pressing bottom layer 18 are fixed between the second adhesive layer 15 and the electronic device, and the elastic body 14 is abutted against the pressing bottom layer 18 by the through groove 152 of the second adhesive layer 15, so that the pressing The surface layer u, the pattern layer 12, the elastic layer 14, the light guiding layer 16, and the pressing underlayer are sequentially stacked to assemble the button panel structure ln. When the button panel structure is used, only the button outline πι of the button surface layer is pressed, and the abutting body 141 of the elastic body 14 correspondingly presses the protrusion 181 of the pressing bottom layer 18, and the protrusion 181 presses the circuit board accordingly. Touch on the point to achieve the conduction and disconnection of the circuit. The resisting body ΐ4ι of the elastic layer 14 has a process of cushioning against the touch, so that the user does not feel the sense of resistance and obtains a better tactile sensation. The button panel structure 1 〇 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 Electronic components into electronic devices. The button panel 冓 10 simplifies the screen printing process by using the opaque but light transmissive sheet 121 ′, thereby eliminating the printing of an opaque but light transmissive ink layer during the screen printing process. Reduces cost and simplifies the color matching between ink layers, improving product yield.
綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施例，本發 明之範圍並不以上述實施例為限，舉凡熟悉本案技藝之人 士援依本發明之精神所作之等效修飾或變化，皆應涵蓋於 以下申請專利範圍内。 【圖式簡單說明】 圖1係本發明較佳實施例按鍵面板結構之立體分解 圖； ⑩ 圖2係本發明較佳實施例按鍵面板結構另一角度之立 體分解圖； 圖3係本發明較佳實施例按鍵面板結構之組裝圖。 【主要元件符號說明】 按鍵面板結構 10 按壓表層 11 按鍵輪麼 111 圖案層 12 片材 121 油墨層 122 按鍵標識 123 第一背膠層 13 彈性層 14 抵持體 141 .201021067 第二背膠層 15 週邊 151 通槽 152 導光層 16 第三背膠層 17 按壓底層 18 凸起 181 11In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a key panel structure according to a preferred embodiment of the present invention; FIG. 2 is an exploded perspective view of another embodiment of a key panel structure according to a preferred embodiment of the present invention; The assembly diagram of the key panel structure of the preferred embodiment. [Main component symbol description] Button panel structure 10 Pressing the surface layer 11 Button wheel 111 Pattern layer 12 Sheet 121 Ink layer 122 Button mark 123 First adhesive layer 13 Elastic layer 14 Resisting body 141 .201021067 Second adhesive layer 15 Peripheral 151 through slot 152 light guiding layer 16 third adhesive layer 17 pressing the bottom layer 18 protrusion 181 11