201015601 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種用於手持裝置之按鍵結構；特別是用於 具有導光膜（light guide film)及柱塞體(plunger)之手持装置之按鍵 結構。 【先前技術】 為了能在各種不同背景光源的條件下使用手持行動裝置，_般 ^ 手持行動裝置均提供一背光源以照亮操作區域，讓使用者能清楚 地辨識不同之輸入按鍵。 第1圖所示係為以發光二極體（LED )作為按鍵光源之一傳統 手持裝置之按鍵結構示意圖。該按鍵結構1具有一印刷電路板10 以及複數彈性按鍵14’並且於印刷電路板1〇上具有複數電路接點 11、具彈性之金屬圓頂開關（Metal Dome)12以及發光二極體13。 各該彈性按鍵14具有一柱體形狀，並可具有一部分彼此互相連 接’其係為由一有彈性、可透光之材質所組成。當使用者下壓彈 Ο 性按鍵14時，彈性按鍵14將會推擠金屬圓頂開關12，使該金屬 圓頂開關12接觸該電路接點11而形成一電路通路。當印刷電路 板10收到該電路通路之訊號時，將會開啟印刷電路板10上之複 數發光二極體13 ’以照亮該些彈性按鍵14。 然而應用按鍵結構1之照明方法，將會使照明效率受到印刷電 路板10上發光二極體13之數量與排列方式之影響。一般而言， 採用按鍵結構1之手持裝置即使用了 6至8顆以上的發光二極體， 尚不能使各彈性按鍵14獲得均勻且足夠明亮之照明。如果使用更 多的發光二極體雖可改善亮度不足的問題，然而此舉將提愚成 201015601 本’而且將更為耗電。有鑑於此，先前技術乃採用一導光板用以 有效地均句化光源所產生之光線，並於提供—定亮度之前提下減 >'發光-極體之使用數量。然而導光板—般具有相當之厚度採 用此類之導光板將佔用手持裝置内部有限之空間，從而增加手持 裝置之體積，不利於產品微小化之發展。 承上所述，習知技術乃以一導光膜作為導光板之一替代方案， 此類導光膜主要亦利用於其端面配置之發光二極體作為光源，光 源所產生之光線將以—特定角度進人導光膜，以滿足内部全反射 之條件藉、q加光線於導光膜内的均勻度，並確保光線不致從 導光膜之表面散逸1在導賴上相對於按鍵部分之表面特定處 有做圖案化處理’使光線只能從圖案處照亮按鍵因此相較於導 光板$光膜可將光源集巾照明*不浪費所以導光膜之導光效 果更佳’且其厚度更薄，最薄可僅有（U公釐，不但有助於體積之 微小化’且其材料成本亦可相對降低。尤其是使科光膜之手 持裝置I。僅而配備2個發光二極體時，其整體所產生之亮 度及均勻度與習知結構使用導光板並配備1G個發光二極體時具有 同等之亮度及均勻度’因此導光膜之出現立即受到業界之青昧與 大量應用。 第2圖所不係為具有前述導光膜之手持裝置中按鍵結構之示意 圖。於按鍵結構2中，一發光二極體23係設置於外殼2〇内部之 側邊，並朝向一導光膜24投射光源，該導光膜24係置於一柱塞 體25及印刷電路板21上之一金屬圓頂開關22之間。柱塞體25 上具有一按鍵模具26,其上具有代表不同操作按鍵之圖樣（未顯 201015601 示）。 當使用者下壓按鍵模具26時’將一併下壓相應之柱塞體25’柱 塞體25壓迫其下方處之導光膜24,從而下壓導光膜24下方之金 屬圓頂開關22。此際金屬圓頂開關22將因應該下壓而於印刷電路 板21上形成一電路通路，使發光二極體23開始發光，並使光線 進入導光膜24。然而’由於導光膜24係設置於柱塞體25與金屬 圓頂開關22之間，而且導光膜24係呈扁平片狀，因此其與金屬 巍 圓頂開關22之間概呈面接觸（Surface Contact)而具有較大之接 觸面積。當按壓按鍵模具26時，經由柱塞體25下壓之起始作用 力，由於受到導光膜24與金屬圓頂開關22間之較大接觸面積所 分散，因而需增加起始作用力，方能形成足夠之下壓力以下壓金 屬圓頂開關22。 具體而言，將下壓金屬圓頂開關而產生一特定形變時所需之作 用力定義為一峰值力量（Peak Force)，而在金屬圓頂開關22被成 功下壓後其所產生之回復力為—回彈力量（Bottom Force )»所謂 © 的段落感（Click Ratio)，即是在整個下壓過程中按鍵回饋給使用 者手指的一種力度感覺，其定義為： (峰值力量一回彈力量）/峰值力量X 1〇〇%。 一般而言’按壓按鍵所形成之段落感約為40%至60%時，具有 一較佳之觸感。於實做上，段落感約為30%時，即可獲得一初步 觸感’然而在前述具有扁平片狀導光模之按鍵結構2中，非但需 要較大之起始作用力’亦即較大之峰值力量，才能下壓按鍵模具 26 ’而且其回饋給使用者之段落感乃反向地下降，而造成使用者 201015601 按壓該手持裝置時，普遍具有按壓不佳之手感。 有鑑於此’提供一可改善按鍵段落感之導光膜按鍵結構，乃為 此一業界亟待解決的問題。 【發明内容】 本發明之-目的在於提供用於具有導光膜之手持裝置之一按鍵 結構’以使按鍵被下壓時回饋給使用者—較佳之段落感，進而帶 給使用者更佳之產品使用體驗。 為達上述目的，本發明之按鍵結構包含一基板、一凸起開關、 導光膜、以及一第一柱塞體。其中，凸起開關設置於基板上， 導光膜設置於凸起開關之上方，第—柱塞體設置於凸起開關以及 導光膜之間。其中當導光膜受一外力下壓時，導光膜適可使下壓 該第一柱塞體，迫使第一柱塞體下壓凸起開關。 為讓本發明之上述目的、技術特徵、和優點能更明顯易懂，下 文係以較佳實施例配合所附圖式進行詳細說明。 【實施方式】 第3圖所示係為本發明之一按鍵結構示意圖此按鍵結構係應 用於一手持裝置巾，需說明的是’圖巾僅顯示與本發明按鍵結構 相關之元件，其餘與本發明無關之元件係略而未示。在按鍵結構3 中，基板31上具有-凸起開關32，發光二極體33係由基板31 所控制而提供祕’並由導光膜34之—側邊導引光線進人基板31 上方之導光膜34以作為光源。其中基板3 i係為_印刷電路板， 凸起開關32可為-具有金屬圓頂結構之金屬彈片開關，或具有擴 圓形、三角形、四邊形等任意形狀之一金屬彈片開關。 為了改善經由導光膜34下壓凸起開關32之段落感，本發明於 201015601 導光膜34及凸起開關32之間設置有一第一柱塞體35，第一柱塞 體45之材料係包含橡膠。特別地是，其中第一柱塞體35具有一 截面積，係小於凸起開關32之一截面積。藉此設置，可將習知導 光膜34及凸起開關32間之面接觸（surface contact)實質轉換為柱 塞體35及凸起開關32間之點對點之接觸，以增加按鍵之段落感 及使用者友善度(user friendly)。詳言之，當導光膜34受一外力而 被下壓時，導光膜34適可使下壓第一柱塞體35，迫使第一柱塞體 φ 35下壓凸起開關32。因此，最後傳遞至凸起開關32之一下壓力 量，係經由一較小之截面積所分散，使得凸起開關32得到一較大 之單位壓力而容易被下壓成功，進而調整所需之起始作用力，使 按鍵結構3能提供一較佳之段落感。 第4圖所不係為本發明另一實施例之按鍵結構示意圖。於此實 施例中，按鍵結構4具有一外殼4〇,基板41係設置於外殼4〇内， 其上具有複數凸起開關42、複數發光二極體43。導光膜44設置 於凸起開關42之上方，並且與凸起開關42之間具有複數第一枉 ❹塞體45 ’於導光膜44上方設置有一按鍵模具4卜於此實施例中， 該些第一柱塞體45之一部分係彼此互相連接，於其他實施例中亦 可彼此獨立而互不連接。 為了進一步提升手持裝置之段落感，本實施例在導光膜44以及 按鍵模具49之間，更具有複數第二柱塞體46。當使用者下壓按鍵 模具49時，可使第二柱塞體46因而受外力而被下壓，並適可下 壓導光膜44以及第一柱塞體45，從而迫使第一柱塞體45下壓該 凸起開關42。需說明的是，於本實施例中，由於與凸起開關42 201015601 為第一柱塞體45，因此二者間點對點接觸之段落感 ’ 、％ σ結構面接觸所形成之段落⑨。而a，由於第 體46與第-柱塞體45兩者之載面積相較於凸起開關42者：皆具 = = = t :因此更可增加第一按鍵模具49與第二柱塞體46 B 、段洛感，以輔助增加整個下壓行程之整體段落感， 同時又不會增加按鍵結構4之整體厚度。再者，本實施例中第二 柱塞體46之-截面積更可大於第-柱塞體45之一截面積，其主 要設十之理4功效除了可增加段落感之外，更可讓使用者在操 作上更舒豸不會有被凸物頂到之感覺，其原因在於若是柱塞體 之截面積沒有作特殊的設計’當使用者下壓按鍵模具49時，杈塞 體之整體力里傳遞係成尖端受力之方式使用者易產生不適感與 ib物感依據實際測試結果顯示，本實施例非但可減少之下 Μ力里’而且更可增加約略5%之段落感，提升使用者使用產品之 手感。 在此實施例中，按鍵結構4更具有複數第一間隔物47以及第二 間隔物48 °第—間隔物47係形成於基板41以及導光膜44之間， 用以支撲導光膜44 ’並間隔基板41 ^及導光膜44。於此實施例 中，第一間隔物47係與第一柱塞體45 —體成型，並且具有〜部 分彼此互相連接，然而於其他實施例中，第一間隔物47以及第〜 柱塞體45之間並不需要一體成型且彼此互相連接。第二間隔物％ 係位於導光膜44以及第二柱塞體46之間，用以支撐第二柱塞趲 46,以及間隔第二柱塞體钋以及導光膜44。 其中，第一柱塞體45以及第二柱塞體46之材料，係包含橡膠 201015601 (rubber)。按鍵模具49之材料，係包含熱塑性聚胺基甲酸酯 (Thermoplastic Polyurethane, TPU )以及聚碳酸酯（Polycarbonate， PC)-201015601 IX. Description of the Invention: [Technical Field] The present invention relates to a button structure for a handheld device; in particular, for a handheld device having a light guide film and a plunger Button structure. [Prior Art] In order to be able to use a handheld mobile device under various background light sources, the handheld mobile device provides a backlight to illuminate the operating area so that the user can clearly recognize different input buttons. Fig. 1 is a schematic diagram showing the structure of a button of a conventional hand-held device using a light-emitting diode (LED) as a button light source. The button structure 1 has a printed circuit board 10 and a plurality of flexible buttons 14' and has a plurality of circuit contacts 11, a flexible metal dome switch 12 and a light-emitting diode 13 on the printed circuit board 1 . Each of the elastic buttons 14 has a cylindrical shape and may have a portion connected to each other', which is composed of a resilient, light transmissive material. When the user presses the elastic button 14, the resilient button 14 will push the metal dome switch 12 so that the metal dome switch 12 contacts the circuit contact 11 to form a circuit path. When the printed circuit board 10 receives the signal of the circuit path, the plurality of light-emitting diodes 13' on the printed circuit board 10 are turned on to illuminate the flexible keys 14. However, the illumination method using the button structure 1 will cause the illumination efficiency to be affected by the number and arrangement of the light-emitting diodes 13 on the printed circuit board 10. In general, the hand-held device using the button structure 1 uses 6 to 8 or more light-emitting diodes, and the elastic buttons 14 cannot be uniformly and sufficiently brightly illuminated. If more LEDs are used, the problem of insufficient brightness can be improved. However, this will increase the power consumption of 201015601. In view of this, the prior art uses a light guide plate to effectively synthesize the light generated by the light source, and to reduce the amount of light-polar body used before providing the brightness. However, the light guide plate generally has a considerable thickness. The use of such a light guide plate will occupy a limited space inside the handheld device, thereby increasing the volume of the handheld device, which is not conducive to the development of miniaturization of the product. As mentioned above, the conventional technology uses a light guiding film as an alternative to the light guiding plate. The light guiding film is mainly used as a light source in the end surface of the light emitting diode, and the light generated by the light source will be- Entering the light guide film at a specific angle to meet the condition of internal total reflection, and adding uniformity of light to the light guide film, and ensuring that the light does not escape from the surface of the light guide film. The surface is specially patterned to make the light only illuminate from the pattern. Therefore, compared with the light guide plate, the light film can illuminate the light source towel* without wasting, so the light guiding effect of the light guiding film is better' and its The thickness is thinner, and the thinnest can be only (U mm, which not only contributes to the miniaturization of the volume), but also the material cost can be relatively reduced. Especially for the handheld device I of the light film. Only two light-emitting two are provided. In the case of a polar body, the brightness and uniformity produced by the whole body are the same as those of the conventional structure using a light guide plate and 1 G light-emitting diodes. Therefore, the appearance of the light-guiding film is immediately recognized by the industry. A large number of applications. Figure 2 A schematic diagram of a button structure in a handheld device having the aforementioned light guiding film. In the button structure 2, a light emitting diode 23 is disposed on a side of the inside of the casing 2 and projects a light source toward a light guiding film 24. The light guiding film 24 is disposed between a plunger body 25 and a metal dome switch 22 on the printed circuit board 21. The plunger body 25 has a button die 26 having a pattern representing different operating buttons ( When the user presses the button mold 26, the plunger body 25 is pressed down to press the corresponding light guide film 24 at the lower portion of the plunger body 25, thereby pressing down the light guide film 24. The metal dome switch 22. The metal dome switch 22 will form a circuit path on the printed circuit board 21 due to the depression, so that the light-emitting diode 23 starts to emit light and allows light to enter the light guiding film 24. Since the light guiding film 24 is disposed between the plunger body 25 and the metal dome switch 22, and the light guiding film 24 is in the form of a flat sheet, it is in surface contact with the metal dome switch 22 (Surface) Contact) has a large contact area. When pressing the button mold At 26 o'clock, the initial force of pressing down through the plunger body 25 is dispersed by the large contact area between the light guiding film 24 and the metal dome switch 22. Therefore, it is necessary to increase the initial force to form sufficient force. The metal dome switch 22 is pressed under the lower pressure. Specifically, the force required to press the metal dome switch to generate a specific deformation is defined as a Peak Force, and the metal dome switch 22 is The successful recovery force is the Bottom Force»the so-called © Click Ratio, which is a kind of dynamic feeling that the button returns to the user's finger during the whole pressing process. Defined as: (peak strength - rebound strength) / peak strength X 1〇〇%. In general, when a button is formed with a stroke feeling of about 40% to 60%, it has a better touch. In practice, when the paragraph sense is about 30%, a preliminary touch can be obtained. However, in the above-mentioned button structure 2 having a flat sheet-shaped light guide mold, not only a larger initial force is required, that is, The peak force of the big one can press the button mold 26' and the sense of the paragraph that is fed back to the user is reversed, causing the user 201015601 to press the handheld device generally, and generally has a feeling of poor pressing. In view of this, it is an urgent problem to be solved in the industry to provide a light guide film button structure which can improve the feeling of the button. SUMMARY OF THE INVENTION The present invention is directed to providing a button structure for a hand-held device having a light guiding film to feed back to the user when the button is pressed, thereby providing a better sense of passage, thereby providing a better product to the user. Use experience. To achieve the above object, the key structure of the present invention comprises a substrate, a bump switch, a light guiding film, and a first plunger body. The protruding switch is disposed on the substrate, the light guiding film is disposed above the protruding switch, and the first plunger is disposed between the protruding switch and the light guiding film. When the light guiding film is pressed by an external force, the light guiding film is adapted to press the first plunger body to force the first plunger body to press the convex switch. The above described objects, features, and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] FIG. 3 is a schematic diagram of a key structure of the present invention. The key structure is applied to a hand-held device towel. It should be noted that the figure only displays the components related to the button structure of the present invention, and the rest and the present The components of the invention are not shown. In the button structure 3, the substrate 31 has a bump switch 32, and the light-emitting diode 33 is controlled by the substrate 31 to provide a secret and guides the light from the side of the light guide film 34 into the upper surface of the substrate 31. The light guiding film 34 serves as a light source. The substrate 3 i is a printed circuit board, and the bump switch 32 can be a metal dome switch having a metal dome structure or a metal dome switch having any shape such as an expanded circle, a triangle, or a quadrangle. In order to improve the sense of passage of the convex switch 32 via the light guiding film 34, the present invention provides a first plunger body 35 between the light guide film 34 and the bump switch 32 of 201015601, and the material of the first plunger body 45 is Contains rubber. In particular, wherein the first plunger body 35 has a cross-sectional area which is smaller than a cross-sectional area of the projection switch 32. By this arrangement, the surface contact between the conventional light guiding film 34 and the bump switch 32 can be substantially converted into a point-to-point contact between the plunger body 35 and the bump switch 32, thereby increasing the paragraph feeling of the button. User friendly. In detail, when the light guiding film 34 is pressed by an external force, the light guiding film 34 is adapted to press down the first plunger body 35, forcing the first plunger body φ 35 to press the convex switch 32. Therefore, the amount of pressure finally transmitted to one of the bump switches 32 is dispersed through a small cross-sectional area, so that the bump switch 32 obtains a large unit pressure and is easily pressed down, thereby adjusting the required amount. The initial force enables the button structure 3 to provide a better sense of paragraph. FIG. 4 is not a schematic diagram of a button structure according to another embodiment of the present invention. In this embodiment, the button structure 4 has a casing 4, and the substrate 41 is disposed in the casing 4, and has a plurality of convex switches 42 and a plurality of LEDs 43 thereon. The light guiding film 44 is disposed above the bump switch 42 and has a plurality of first plug bodies 45 ′ between the bump switch 42 and a button mold 4 disposed above the light guiding film 44. In this embodiment, the One of the first plunger bodies 45 is interconnected to each other, and in other embodiments may be independent of each other without being connected to each other. In order to further enhance the sense of passage of the hand-held device, the present embodiment further has a plurality of second plunger bodies 46 between the light guiding film 44 and the button mold 49. When the user presses the button mold 49, the second plunger body 46 can be depressed by an external force, and the light guiding film 44 and the first plunger body 45 can be pressed down, thereby forcing the first plunger body. The raised switch 42 is depressed 45. It should be noted that, in the present embodiment, since the bump switch 42 201015601 is the first plunger body 45, the paragraphs 9 of the point-to-point contact between the two are in contact with each other. And a, since the loading area of both the first body 46 and the first plunger body 45 is compared with the convex switch 42: all have ===t: therefore, the first button mold 49 and the second plunger body can be further increased. 46 B, segmental sense, to help increase the overall paragraph feel of the entire downstroke stroke, while not increasing the overall thickness of the button structure 4. Furthermore, in this embodiment, the cross-sectional area of the second plunger body 46 can be larger than the cross-sectional area of the first plunger body 45, and the main function of the ten-portion 4 is to increase the paragraph feeling, and The user is more comfortable in operation and does not feel the convex object. The reason is that if the cross-sectional area of the plunger body is not specially designed, when the user presses the button mold 49, the whole body of the damper body The force transmission is in the form of a tip force, and the user is prone to discomfort and ib feeling. According to the actual test results, this embodiment can not only reduce the Μ力里, but also increase the paragraph feeling of about 5%, and improve The user's feel of using the product. In this embodiment, the button structure 4 further has a plurality of first spacers 47 and a second spacer 48°. The spacers 47 are formed between the substrate 41 and the light guiding film 44 for supporting the light guiding film 44. 'And the substrate 41 ^ and the light guiding film 44 are spaced apart. In this embodiment, the first spacers 47 are integrally formed with the first plunger body 45, and have portions that are connected to each other. However, in other embodiments, the first spacers 47 and the first to the plunger bodies 45. There is no need to be integrally formed and connected to each other. The second spacer % is located between the light guiding film 44 and the second plunger body 46 for supporting the second plunger 46 and spacing the second plunger body and the light guiding film 44. The material of the first plunger body 45 and the second plunger body 46 includes rubber 201015601 (rubber). The material of the button mold 49 is composed of thermoplastic polyurethane (TPU) and polycarbonate (Polycarbonate, PC).
上述之實施例僅用來例舉本發明之實施態樣，以及闞釋本發明 之技術特徵，並非用來限制本發明之保護範疇。任何熟悉此技術 者可輕易完成之改變或均等性之安排均屬於本發明所主張之範 圍本發明之權利保護範圍應以申請專利範圍為準。【圖式簡單說明】 第1圖係為利用傳統發光二極體配置之按鍵結構示意圖； 第2圖係為傳統具有導光膜之按鍵結構示意圖； 第3圖係為本發明之按鍵結構示意圖；以及 為本發明另一實施例之按鍵結構示意圖。 10 印刷電路板 12 金屬圓頂開關 14 彈性按鍵 20 外殼 22 金屬圓頂開關 24 導光膜 26 按鍵模具 31 基板 33 發光二極體 35 柱塞體 40 外殼 要元件符號說明】 11 13 2 21 23 25 3 32 34 4 按鍵結構 電路接點 發光一極體 按鍵結構 印刷電路板 發光二極體 柱塞體 按鍵結構 凸起開關 導光犋 按鍵結構 11 201015601 41 基板 42 凸起開關 43 發光二極體 44 導光膜 45 第一柱塞體 46 第二柱塞體 47 第一間隔物 48 第二間隔物 49 按鍵模具 12The embodiments described above are only intended to illustrate the embodiments of the present invention, and to explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or equivalents that can be easily made by those skilled in the art are intended to be within the scope of the invention. The scope of the invention should be determined by the scope of the claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a button structure using a conventional light-emitting diode configuration; FIG. 2 is a schematic diagram of a conventional button structure having a light guiding film; FIG. 3 is a schematic diagram of a key structure of the present invention; And a schematic diagram of a button structure according to another embodiment of the present invention. 10 Printed circuit board 12 Metal dome switch 14 Elastic button 20 Housing 22 Metal dome switch 24 Light guide film 26 Key mold 31 Substrate 33 Light-emitting diode 35 Plunger body 40 Symbols of the housing components] 11 13 2 21 23 25 3 32 34 4 Key structure circuit contact light one pole body button structure printed circuit board light emitting diode body button structure convex switch light guide button structure 11 201015601 41 substrate 42 raised switch 43 light emitting diode 44 guide Light film 45 first plunger body 46 second plunger body 47 first spacer 48 second spacer 49 button mold 12