099年08月16日修正替換頁 、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種光學元件，尤其涉及可變焦的透鏡。 【先前技術】 [0002] 傳統的光學透鏡較多採用玻璃材質，由於玻璃透鏡的製 造成本較為昂貴，現有技術中出現了塑膠的光學透鏡， 塑膠透鏡具有價格低、重量輕等優點，其在光學領域中 越來越得到廣泛的應用。 [0003] 對於材料和形狀確定的透鏡來說，其焦距為一恆定值。 在實際應用中，變焦功能的實現一般都是對於由幾片鏡 片組成的光學模組而言的，如第一圖所示，光學模組100 包括第一鏡片102、第二鏡片104、内鏡架106以及外鏡 架108，其中第一鏡片10 2安裝在内鏡架106中，第二鏡 片104安裝在外鏡架108中，外鏡架108套裝在内鏡架106 外圍。通過改變二鏡架106和108在軸向的相對距離，以 改變分別安裝在二鏡架中的鏡片102和104的距離，從而 改變該光學模組100的焦距。 [0004] 上述光學模組1 0 0的變焦功能必須將鏡片分裝在不同的鏡 架中，通過鏡架的相對運動改變鏡片之間的距離，從而 改變鏡組的焦距。此種變焦的方式至少需要兩個鏡架， 組裝也較為麻煩。 【發明内容】 [0005] 有鑒於此，有必要提供一種變焦透鏡，其結構簡單，組 裝方便，能夠精確控制透鏡焦距的變化。 表單編號A0101 第3頁/共9頁 0993291881-0 [0006] 1338153 [0007] [0008] m边鏡，包括-透鏡和安裝在該透鏡周圍的愿電 陶宪片，該透鏡具有-定的彈性；給壓電m通電時 ，其沿該透鏡徑向方向的長度伸長對該透鏡產生擠虔， 使該透鏡變形而改變該透鏡的焦距。 同習知技術相比，本㈣變㈣鏡在—般魏上增加了 壓電陶究片，當需要變焦時，給該壓電陶竞片通電就可 使透鏡的焦距跟隨壓電陶以的伸縮作相應地改變。該 變焦透鏡結構簡單’組裝容易，操作方便，能夠大大提 南生產效率。 【實施方式】 如第二圖所示，變焦透鏡1安裝在鏡架4内，該變焦透鏡! 包括透鏡2以及安裝在透鏡2涛图的壓電陶究片3。壓電陶 究片3在通電時可發生伸縮效應，對透奶產生擠壓使 透鏡2的焦距改變。 [0009] 透!兄2為復σ透鏡，包括基層22、上復合層以及下復合 層26基層22為玻璃材質，上復合層24和下復合層^都 為可塑性材料，如PDMS(PGlydimethyisiiGxane)等 。該透鏡2各層之間通過黏貼、熱壓等方式接合在一起。 壓電陶瓷片3貼合在锈锫u A 在边鏡2的上、下復合層14和16的侧面 基層22兩側各具有一凸塊222，鏡架4内側具有 二卡槽 42將基層22的凸塊222卡入鏡架4的卡槽42中即可將變 焦透鏡1安裝在鏡架4内。 [0010] 094113003 壓電喊即為電致伸縮材料，在電場仙下具有伸縮效 應，可將電能轉化為機械能。壓電H在通電後具體的伸長量和通人電流的電料關 表雜顧 ㈣共H J以様不1 ^338153 099年08月16日按正替换頁 的數值點變化’每個數值點對應__個電壓值。壓電陶究 -般為片狀或柱狀，其長度通常處於毫米級，根據所應 用的具體情沉可it用不同形狀及長度的壓電陶瓷。 _]在正常情況下’透鏡2的焦距是恆定的，當透鏡2的焦距 不能滿足需要時’給壓電陶通電，該壓電陶曼片3 的長度h增加，進而對透鏡2的上、下復合層以和“產生 擠壓作用’使該二復合層的形狀發生變化，由於透鏡的 焦距與其鏡面形狀和厚度等因素相關，因而壓電陶瓷片3 對透鏡2的擠壓可使透鏡2的焦距發生改變。 [0012] 預先設計透鏡2可改變的幾個焦距，通過壓電陶瓷片3在 伸長時與透鏡2發生的作用關係使透鏡2的每—焦距與壓 電陶瓷片3的伸長量--對應。通過控制通電電壓的大小 使壓電陶瓷片3增長到特定的數值點，此時，壓電陶究片 3對透鏡2產生擠壓’從而使透鏡2達到對應的焦距。因而 通過控制電壓可以精確地將透鏡2的焦距調節到需要的& 值。 [0013] 由於透鏡2的上、下復合層24和26為可塑性材料，其n 一定的彈性。因而，需要恢復透鏡2的正常焦距時，將壓 電陶瓷片3斷電，其長度回復到通電前的狀態，其對上、 下復合層24和26的擠壓作用也隨之釋放，使上、下復合 層24和26的形狀回復到正常狀態’透鏡2的焦距也得到復 原。 [0014] 透鏡2形狀的變化量取決於壓電陶瓷片3的種類以及壓電 陶瓷片3的通電電壓的大小。在透鏡2的復合層24和26的 0993291881-0 094113003 表單編號A0101 第5頁/共9頁 1338153 » 099年08月16日修正替換頁 彈性範圍内，其焦距可隨壓電陶瓷片3的通電電壓的變化 做一系列改變。 [0015] 復合透鏡可以減小佔用空間，並且便於安裝，通過各層 材料的變化可改變其光學折射率，從而引導光線到達所 需的路徑。當然，上述的透鏡2也可為一單透鏡，該單透 鏡由可塑性材料注射或模壓成型。在其外圍安裝壓電陶 瓷片，給該壓電陶瓷片通電，其長度增長後致使該單透 鏡發生變形，因而其焦距發生變化。同樣，需要恢復正 常焦距時，只需將壓電陶瓷片斷電即可。 | [0016] 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，舉凡 熟悉本發明技藝之人士，在援依本發明精神所作之等效 修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 [0017] 第一圖係習知技術透鏡變焦結構的示意圖。 [0018] 第二圖係本發明變焦透鏡的示意圖。 _ i 【主要元件符號說明】 ί [0019] 變焦透鏡：1 ； [0020]透鏡：2 ； [0021] 壓電陶瓷片：3 [0022] 鏡架：4MODIFICATION OF ALTERNATE PAGE, EMBODIMENT INSTRUCTIONS: [Technical Field] [0001] The present invention relates to an optical element, and more particularly to a variable focus lens. [Prior Art] [0002] Conventional optical lenses are mostly made of glass. Since the manufacturing cost of glass lenses is relatively expensive, plastic optical lenses have appeared in the prior art. Plastic lenses have the advantages of low price and light weight, and are optical. It is getting more and more widely used in the field. [0003] For materials and shape-determined lenses, the focal length is a constant value. In practical applications, the zoom function is generally implemented for an optical module composed of several lenses. As shown in the first figure, the optical module 100 includes a first lens 102, a second lens 104, and an endoscope. The frame 106 and the outer frame 108, wherein the first lens 10 2 is mounted in the inner frame 106, the second lens 104 is mounted in the outer frame 108, and the outer frame 108 is fitted around the outer frame 106. The focal length of the optical module 100 is varied by varying the relative distance of the two frames 106 and 108 in the axial direction to vary the distance of the lenses 102 and 104 respectively mounted in the two frames. [0004] The zoom function of the optical module 1000 described above must divide the lenses into different frames, and the relative movement of the frames changes the distance between the lenses, thereby changing the focal length of the lens group. This type of zoom requires at least two frames, and assembly is cumbersome. SUMMARY OF THE INVENTION [0005] In view of the above, it is necessary to provide a zoom lens which is simple in structure, convenient in assembly, and capable of accurately controlling variations in lens focal length. Form No. A0101 Page 3 of 9 0993291881-0 [0006] 1338153 [0007] [0008] The m-side mirror includes a lens and a ceramic tile mounted around the lens, the lens having a constant elasticity When the piezoelectric m is energized, its length in the radial direction of the lens is elongated to cause squeezing of the lens, and the lens is deformed to change the focal length of the lens. Compared with the conventional technology, the (four) variable (four) mirror adds a piezoelectric ceramic film to the general Wei. When the zoom is needed, the piezoelectric ceramic tile can be energized to make the focal length of the lens follow the piezoelectric ceramic. The expansion and contraction changes accordingly. The zoom lens has a simple structure, is easy to assemble, and is easy to operate, and can greatly improve production efficiency. [Embodiment] As shown in the second figure, the zoom lens 1 is mounted in a frame 4, which includes a lens 2 and a piezoelectric ceramic sheet 3 mounted on the lens 2 of the lens. The piezoelectric ceramic sheet 3 can undergo a stretching effect when energized, and the projection of the milk is caused to change the focal length of the lens 2. [0009] The brother 2 is a complex sigma lens, including the base layer 22, the upper composite layer, and the lower composite layer 26, the base layer 22 is made of glass, and the upper composite layer 24 and the lower composite layer are both plastic materials, such as PDMS (PGlydimethyisii Gxane), etc. . The layers of the lens 2 are joined together by adhesion, hot pressing, or the like. The piezoelectric ceramic sheet 3 is attached to the rust 锫 u A. Each of the side base layers 22 of the upper and lower composite layers 14 and 16 of the side mirror 2 has a bump 222 on each side thereof, and the inside of the frame 4 has two card slots 42 for the base layer 22 The zoom lens 222 is inserted into the card slot 42 of the frame 4 to mount the zoom lens 1 in the frame 4. [0010] 094113003 Piezoelectric shunt is an electrostrictive material that has a telescopic effect under the electric field to convert electrical energy into mechanical energy. Piezoelectric H after the power-on, the specific elongation and the electrical current of the electric current are turned off (4) Total HJ is not 1 ^ 338153 099 August 16th according to the value of the positive replacement page change 'Each value point corresponding __ voltage value. Piezoelectric ceramics are generally sheet-like or columnar, and their lengths are usually on the order of millimeters. Piezoelectric ceramics of different shapes and lengths can be used depending on the specific application. _] Under normal circumstances, the focal length of the lens 2 is constant, and when the focal length of the lens 2 is not satisfactory, the piezoelectric ceramic is energized, and the length h of the piezoelectric ceramic sheet 3 is increased, thereby on the upper side of the lens 2, The lower composite layer changes the shape of the two composite layers with "generating extrusion". Since the focal length of the lens is related to its mirror shape and thickness, the piezoelectric ceramic sheet 3 can be pressed against the lens 2 to make the lens 2 The focal length of the lens 2 is changed in advance. [0012] The focal length of the lens 2 can be changed in advance, and the relationship between the focal length of the lens 2 and the elongation of the piezoelectric ceramic sheet 3 is caused by the action of the piezoelectric ceramic sheet 3 on the lens 2 during elongation. The amount--corresponding. The piezoelectric ceramic sheet 3 is grown to a specific numerical point by controlling the magnitude of the energization voltage, at which time the piezoelectric ceramic sheet 3 is pressed against the lens 2 so that the lens 2 reaches a corresponding focal length. The focal length of the lens 2 can be precisely adjusted to the desired & value by controlling the voltage. [0013] Since the upper and lower composite layers 24 and 26 of the lens 2 are plastic materials, their n is a certain elasticity. Therefore, the recovery lens 2 is required. Normal focus When the piezoelectric ceramic sheet 3 is de-energized, its length is restored to the state before the energization, and the pressing action on the upper and lower composite layers 24 and 26 is also released, so that the shapes of the upper and lower composite layers 24 and 26 are released. Returning to the normal state, the focal length of the lens 2 is also restored. [0014] The amount of change in the shape of the lens 2 depends on the type of the piezoelectric ceramic sheet 3 and the magnitude of the energization voltage of the piezoelectric ceramic sheet 3. The composite layer 24 in the lens 2 0993291881-0 094113003 of 26 and Form No. A0101 Page 5 of 9 1338153 » The correction of the replacement page in the elastic range of August 16, 099, the focal length can be changed with the change of the voltage of the piezoelectric ceramic piece 3 [0015] The compound lens can reduce the occupied space and is easy to install, and the optical refractive index can be changed by changing the material of each layer to guide the light to a desired path. Of course, the lens 2 described above can also be a single lens. The single lens is injection molded or molded by a plastic material. A piezoelectric ceramic piece is mounted on the periphery thereof, and the piezoelectric ceramic piece is energized, and the length thereof is increased to cause the single lens to be deformed, so that the focal length thereof changes. Similarly, when it is necessary to restore the normal focal length, it is only necessary to electrically charge the piezoelectric ceramic piece. [0016] In summary, the present invention complies with the invention patent requirements, and patents are filed according to law. In the preferred embodiment of the present invention, equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. [Simplified Description] [0017] The first figure is a schematic diagram of a conventional lens zoom structure. [0018] The second figure is a schematic view of the zoom lens of the present invention. _ i [Main component symbol description] ί [0019] Zoom lens: 1; [0020] Lens: 2 ; [0021] Piezoelectric ceramic sheet: 3 [0022] Frame: 4
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[0023] 基層：22 [0024] 上復合層：24 094113003 表單編號A0101 第6頁/共9頁 0993291881-0 13381.53 [0025] 下復合層： [0026] 凸塊：222 [0027] 卡槽：42 26 099年08月16日按正替换頁[0023] Base layer: 22 [0024] Upper composite layer: 24 094113003 Form number A0101 Page 6 / Total 9 pages 0993291881-0 13381.53 [0025] Lower composite layer: [0026] Bump: 222 [0027] Card slot: 42 26 August 16th, 2010, press the replacement page
094113003 表單編號A010] 第7頁/共9頁 0993291881-0094113003 Form No. A010] Page 7 of 9 0993291881-0