200916872 鉤件25 導槽261 架體27 電極31，32 架體24 導執裝置26 導軌262 回復彈性件30 八、 本案若有化學式時，請揭示最能顯示發明特徵的化 學式：（無） 九、 發明說明： 【發明所屬之技術領域】 、 本發明係有關一種鏡頭移位機構（lens displacement mechanism) ’尤指一種藉形狀記憶合金線（SMA線）與彈 簧力來控制鏡頭之前/後移位以進行自動對焦，供可應用 於一自動對焦鏡頭模組者。 【先前技術】 目前使用之數位相機、具拍攝功能的手機、筆記型電 腦等手持式電子裝置上，常設有一可自動對焦 (auto-focusing，簡稱AF )之微型相機（鏡頭）模組 (compact camera module，簡稱CCM)，而該鏡頭模組基 C 本上包含· 一容腔（housing ); —由鏡片群（lens group )及一鏡頭夾持部（iens holder)組成之鏡頭，其 係套设在§亥容腔内且位於光轴上，並可朝接近物 (object )之方向以滑動方式或螺旋轉動方式進行移位； 及一鏡頭移位（控制）機構（lens displacement/control mechanism) ’主要用以驅動該鏡頭在光軸上產生滑動方式 或螺旋轉動方式之移位動作，藉以達成自動對焦之功效。 常見之習知鏡頭移位機構的設計包含有：一種稱為壓 電馬達（piezoelectric motor )，其係利用壓電 (piezoelectric )材料原理形成，但一般所使用之壓電材 200916872 材』垾(refl〇w)高溫，而可耐受迴焊高溫之特別200916872 Hooks 25 Guides 261 Frames 27 Electrodes 31, 32 Frames 24 Guides 26 Guides 262 Resilience 30 30. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: (none) [Description of the Invention] [Technical Field] The present invention relates to a lens displacement mechanism, in particular, a shape memory alloy wire (SMA wire) and a spring force to control the front/rear displacement of the lens. Autofocus is available for use with an autofocus lens module. [Prior Art] On the handheld electronic device currently used, such as a digital camera, a mobile phone with a shooting function, and a notebook computer, there is an auto-focusing (AF) miniature camera (lens) module (compact camera). Module, referred to as CCM), and the lens module base C includes a housing; a lens consisting of a lens group and an ens holder, the sleeve is sleeved In the 亥海容 cavity and on the optical axis, and can be displaced in the direction of the object in a sliding manner or a spiral rotation; and a lens displacement control mechanism (lens displacement/control mechanism) It is mainly used to drive the lens to produce a sliding mode or a spiral rotation mode on the optical axis, thereby achieving the effect of autofocus. The common design of the lens shifting mechanism includes: a piezoelectric motor, which is formed by the principle of piezoelectric material, but generally used piezoelectric material 200916872 垾 (refl 〇w) high temperature, which can withstand the special high temperature of reflow
箬式搜Η、冉VCM)者，其係利用電磁力與彈性件（如彈 立ϋ ί合形成，但在迴焊（reflow)溫度時將會損壞 i在低磁力’因此上述習用之壓電馬達與音圈馬 1 一括夺白不可使用迴焊，致在量產效率上受到限制； 種利用形狀記憶合金（shape memoir alloy ，簡稱為 —)而形成者，其係利用一 SMA裝置（SMA device ) 了 而藉由SMA的「熱縮冷漲」特性以驅使鏡頭產生移位效 果、’由於SMA可達5 %收縮量，遠大於一般材質之熱 漲冷縮變形量’且SMA可耐受迴焊高溫’致在組裝時可使 用迴焊，故可增加組裝產量而有具體實用價值。而目前在 鏡頭移位機構之設計領域中已有甚多利用SMA的習知技 術’如：US5，185,621A、US5,279，123A、US5,459,544A、 US 6,307,678B2、US 6,449,434B1、W02005001540、 US20020136548 ' US2007058070 > US2007047938 > JP64000938 、 JP9127398 、 JP62067738 、 JP3196781 、 JP2006329111 、 JP2005275270 、 JP2005195998 、 JP2005156892 、 JP2004184775 、 JP2004129950 、 JP2004069986、JP2004038058、JP2000056208 等，而上述 各專利案雖然都是利用SMA作為鏡頭移位的驅動力，但所 揭不的技術手段或驅動方式卻各有不同；惟，上述各習知 技術之結構大部分仍較為複雜，體積相對較大，不符合鏡 頭模組之小型化要求，例如US6,449,434B1，其係利用一 SMA線，使其二相對端固定住，並使其介於二相對端之間 的中間活動段之長度向中間點（longitudinal mid-point;) 拉緊懸掛在一可樞轉運動之制動器（actuator )的外緣一 溝槽上以作為驅動施力點，而該制動器的外緣上另設一相 對之凸梢並卡入一鏡頭夾持部（lens holder)之外緣一卡 200916872 槽中以作為應力點，使謂該SMA線熱 動該制動器（actuator )樞轉一角度，使；= 生以驅 (actuator )上該相對之凸梢也同步樞」 ° 凸梢與鏡頭夾持部之外緣上卡槽之間的阳人用度，進而藉 之位置，藉以達成鏡頭移位並定位之調整功 成鏡頭之對焦功能。由上可知，US6，姻，434B ^他^箬 Η Η 冉 冉 冉 , , , 利用 利用 利用 利用 利用 利用 利用 利用 利用 利用 利用 利用 利用 利用 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁 电磁The motor and the voice coil horse 1 can not be used for reflow, which is limited in mass production efficiency. The shape is formed by a shape memoir alloy (abbreviated as -), which uses an SMA device (SMA device). And by the "heat shrinkage and cold rise" characteristic of SMA to drive the lens to shift the effect, 'because SMA can reach 5% shrinkage, far greater than the thermal expansion and contraction deformation of general materials' and SMA can withstand back The high temperature of welding can be used for reflow soldering during assembly, so it can increase the assembly yield and has specific practical value. At present, there are many conventional techniques for utilizing SMA in the design field of lens shifting mechanisms such as: US5,185,621 A, US5, 279, 123A, US5, 459, 544A, US 6, 307, 678B2, US 6, 449, 434B1, W02005001540, US20020136548 ' US2007058070 > US2007047938 > JP64000938, JP9127398, JP62067738, JP3196781, JP2006329111, JP200527527 0, JP2005195998, JP2005156892, JP2004184775, JP2004129950, JP2004069986, JP2004038058, JP2000056208, etc., while the above patents all use SMA as the driving force for lens shift, but the technical means or driving methods are different; However, most of the above-mentioned conventional techniques are still relatively complicated in structure and relatively large in size, and do not meet the miniaturization requirements of the lens module. For example, US 6,449,434 B1 uses an SMA wire to fix the opposite ends thereof. And the length of the intermediate movable section between the opposite ends is pulled to the outer edge of the pivotable actuator to the intermediate point (longitudinal mid-point;) The driving point is driven, and a corresponding convex tip is disposed on the outer edge of the brake and is clamped into the outer edge of a lens holder to be a stress point in the slot of the 200916872, so that the SMA line is hot. The actuator is pivoted at an angle so that the opposite bumps on the actuator are also synchronized. The bump and the outer edge of the lens clamping portion are engaged with the slot. Male human costs, and further by the position, so as to achieve the positioning of the lens shift and the focus adjusting lens to a power function. From the above, US6, marriage, 434B ^ he ^
技術雖然相同利用SMA線作為驅動力源，但卻者 其他連動裝置如制動器（actuatQr)或其他 桿 裝置等才能驅動鏡頭夾持部移位，也就是，習夫 == 干 SMA線與鏡頭夾持部（lens holder )之間幾乎都另設一連 動裝置’用以使SMA之收縮驅動力藉該連動裝置而^換 鏡頭夾持部（lens holder)之驅動力；因此習知技術在 SMA之應用上，其鏡頭移位（控制）機構之結構及運動方 式過於複雜而不夠簡化，相對影響鏡頭模組小型化及降低 成本之設計要求，不利於量產化，故仍有進一步改進办 間。 二 【發明内容】 本發明主要目的乃在於提供一種利用形狀記憶合金 (SMA )之鏡頭移位機構（iens displacement mechanism using shape memory al loy )，適用於一自動對焦鏡頭模組 (auto-focusing lens module )，其係利用一形狀記憶合 金線（shape memory alloy wire，簡稱為 SMA 線），使該 SMA線之二相對端（0pp0Site ends )固定住，並使介於二 相對端之間的中間活動段（intermediate movable portion )的長度向中間點（i〇ngitudinal mid-point )拉 緊懸掛在鏡頭夾持部（lens holder )外緣上所設之一對應 鉤件上’使該中間活動段相對於二相對端形成緊張狀態； 200916872 ，上述結構，當SMA線因電流導通而受熱時，該中間活 =可收縮而牽該對應鉤件，藉以驅動該鏡頭在光軸上 移位而達成自動對焦效果。Although the technology uses the SMA wire as the driving force source, other linkage devices such as brakes (actuatQr) or other lever devices can drive the lens clamping portion to be displaced, that is, the Xifu == dry SMA wire and lens clamping There is almost a separate linkage between the lens holders to enable the contraction driving force of the SMA to change the driving force of the lens holder by the linkage device; therefore, the conventional technology is applied to the SMA. In addition, the structure and movement mode of the lens shifting (control) mechanism are too complicated and not simplified, and the design requirements for miniaturization and cost reduction of the lens module are relatively unfavorable for mass production, so there is still room for further improvement. [Disclosed] The main object of the present invention is to provide an iens displacement mechanism using shape memory al loy for an auto-focusing lens module. ), which uses a shape memory alloy wire (SMA wire) to fix the opposite ends of the SMA wire (0pp0Site ends) and to make an intermediate movable section between the opposite ends of the SMA wire. The length of the intermediate movable portion is pulled to the intermediate point (i〇ngitudinal mid-point) and hung on one of the corresponding hook members on the outer edge of the lens holder. The opposite end forms a tension state; 200916872, the above structure, when the SMA wire is heated by the current conduction, the intermediate activity = can be contracted to take the corresponding hook member, thereby driving the lens to shift on the optical axis to achieve an autofocus effect.
本發明再^目的乃在於提供一種利用形狀記憶合金 _( SMA )_之鏡頭移位機構，其可利用一條以上之8黯線如 =條或三條或四條等，使該等SMA線以環周緣對稱或等 =式佈設在鏡頭之外周緣處，並使各SMA線之二相對端 住，而其介於二相對端之間的中間活動段則分別各 ^緊懸掛在鏡頭外緣上一分別對應設立之鉤件上，使各 MA線之中間活動段相對於二相對端形成緊張狀態；藉上 v結構，當各SMA線因電流同步導通而受熱時，各sma 之中間活動段可同步收縮並牽引鏡頭上之對應鉤件，以 同步驅動該鏡頭在光軸上滑動移位而達成自動對焦效^。 本發明又一目的乃在於提供一種利用形狀記憶合金 j SMA )之鏡頭移位機構，其進一步可在鏡頭上配置一回 f彈性件（return印rinS element )，當SMA線因電流切 斷而冷卻並膨脹回復至原來長度時，該回復彈性件可 對之回復力，以使該鏡頭回復至原位而達成自兄 r 明另一目的乃在於提供—種利用形狀記憶合金 緣之間設置相對應配合之導轨裝置， 壁 應配合，以使鏡頭可在容腔内穩定地滑動移^。、導軌對 【實施方式】 為使本發明更加明確詳實，茲列舉較佳 下列圖示’將本發明之結構及其技術特徵詳=並配δ 本發明以下所揭示之實施6例，乃是針對本發明鏡頭移 200916872 位機構之主要構成元件或直接相關之元件而作說明，因此 本發明以下所揭示之實施例雖是應用於一自動對焦鏡頭模 組中，但就一般具有自動對焦功能之鏡頭模組而言，除了 本發明所揭示之鏡頭移位機構外，其他結構乃屬一般通知 之技術，因此一般在此領域中熟悉此項技藝之人士瞭解， 本發明^揭示自動對焦鏡頭模組之構成元件並不限制於以 下所揭示之實施例結構，也就是該自動對焦鏡頭模組之各 構成元件是可以進行許多改變、修改、甚至等效變更的， 例如·該鏡頭模組中容腔（housing )之形狀設計並不限 制，也就是鏡頭模組之内部空間設計並不限制；或由鏡片 群_( lens group )及一鏡頭夾持部（lens h〇lder)組 鏡頭的整體形狀或結構型態也不限制，如該鏡頭（比⑽ 可包含由單一鏡片或數個鏡片構成之鏡片群，且單一鏡片 片群-般可先容設在一固定件内而再與一鏡頭失持部 ( =ns h〇ider)結合形成一鏡頭；或該鏡頭炎持部 holder)之形狀或結構型態也不限制，其在組裝上可作各 種不同设計，供可配合該鏡頭模組之外殼、内部空間、容 ，（Rousing )或内部其他構成元件等以組裝成一體而形 成一鏡頭模組；或該SMA線之使用線數與所驅動的鏡頭數 也，限制，可由一 SMA線驅動一鏡頭或由多組sma線驅動 一個鏡頭或多個鏡頭。 參考圖1-3所示，其分別係本發明一實施例之立體、 上視及一側面示意圖。本發明利用形狀記憶合金（SMA ) 頭移位機1 ，係可應用於一自動對焦鏡頭模組2中， ^中=鏡頭模組2基本上至少包含—容腔（h〇using ) 頭21在容腔2〇内之光軸X上可滑動移位；該鏡 播含一由早一鏡片（lenS)或數個鏡片（如二鏡 )，成之鏡片群22以及一供容設該鏡頭群22之鏡頭夾持 邓（lens holder) 23，也就是鏡片群22及鏡頭夾持部23一 200916872 般是組成一可同步移動的鏡頭21，且套設在容腔2〇内而可 在光拍X上滑動移位’但该鏡頭21包含鏡片群22或鏡頭夾 持部（lens holder) 23的結構或組裝型態並不限制。 本發明鏡頭移位機構1包含至少一形狀記憶合金線 (shape memory alloy wire，簡稱為 SMA 線）1〇 ，其可 隨著應用在SMA線之溫度而產生一種麻田散/沃斯田鐵結 構變換（martensite/austenite transformation )的特性； 當一 SMA線（或SMA裝置）受熱達到沃斯田鐵轉換起始溫 度（autenitic start temperature)與沃斯田鐵轉換結束溫 度（autenitic finish temperature )之間時，可呈現「熱 縮」特性；而當冷卻至麻田散鐵轉換起始溫度 (martensite start temperature )與麻田散鐵轉換結束溫 度（martensite finish temperature)之間時，可呈現「冷 脹」特性。而藉由SMA線上導通電流以使其產生溫度升降 及其其熱縮冷漲:特牲，可使鏡頭21滑動移位。 本發明之特徵在於：該SMA線10具有二相對端 (opposite ends ) 11 及一中間活動段（intermediate movable portion) 12介於二相對端11之間，其中該二相對 端11係固定住，如可固定於鏡頭模組2之容腔2〇之外緣處 的架體24上’至於二相對端π之固定方式並不限制，包括 炎固、黏固、焊固等不同方式，但以能簡易加工而完成固 疋為佳。該中間活動段12之長度向中間點（longitudinal mid-point) 13係拉緊懸掛在鏡頭21外緣上一對應鉤件25 上’其中該對應鉤件25可設於鏡片群22之固定件之外緣上 或设於鏡頭夾持部（lens holder ) 23之外緣上，以使該中 間活動段12在懸掛該鉤件25之後可相對於二相對端11形成 緊張狀態；藉上述結構，當該SMA線10因電流導通而受熱 時’該SMA線1〇之中間活動段12可收縮並牵引該鉤件25， 200916872 藉以驅動該鏡頭21在光軸χ上滑動移位而達成自動對焦效 果。 本發明利用SMA線10的數目及各線1〇在鏡頭21之 環周緣外的佈設方式並不限制，玆選擇利用一條、二條及 四條SMA線10作為實施例，分別說明如下： <第一實施例> 參考圖1-3所示，本實施例係利用一條SMA線10，當 物距由遠而近時，鏡頭21則遠離成像側朝向物體側移位以 達到對焦的目的；在本實施例中，鏡頭21與成像面距離變 化如表一： 表一 物距（ram) 70 100 600 1000 無窮遠 鏡頭移動 距離（ran ) 0.243 0.167 0.023 0.011 0 當對焦時，鏡頭21係受控制而移動，即，自動對焦之 鏡頭21係由一對焦按鈕所控制（圖未示），當使用者按下 對焦按鈕時，則可藉由電極31,32兩端對鏡頭移位機構1 供電，當控制電流流經SMA線10後，可因SMA線10之阻抗 而產生焦耳熱（Joule heat )，使SMA線10受熱而收縮， 而因SMA線10的長度、溫度與控制電流之間為一近似線性 關係，進而可藉SMA線10收縮量而控制鏡頭21之適當位 移，以使鏡頭21與成像面距離改變，以達成對焦之目的。 在本實施例中，SMA線10使用材質為鎳鈦合金、線徑 為0.002”的SMA線，控制電流與SMA長度變化分別如表 二所示。 200916872 物距（mm) 70 100 600 1000 無窮遠 鏡頭移動 距離（mm ) 0.243 0.167 0.023 0.011 0 控制電流 (mA) 50 35 20 15 0 上述經由電極31，32兩端對鏡頭移位機構1供電的結 構及導電連接方式，包含藉由電路板或電子線路以控制經 過該SMA線10之電流的導通或切斷以及經過該SMA線1〇之 電流強弱等，並不限制’由於該等設計並非屬於本發明鏡 頭移位機構1之主要構成元件，亦非本發明之特徵所在， 且利用目前電子相關技術即能達成設計目的者，故不在此 再詳加敘述。 本實施例進一步可在鏡頭21上配置一回復彈性件 (return spring element ) 30如彈簧或彈片，當 SMA 線 10 因電流切斷而冷卻致膨脹回復至原來長度時，該回復彈性 件30可對鏡頭21提供一與SMA線10之收縮牵引力反向之回 復力，也就是與該SMA線10之中間活動段12因收縮而牽引 鏡頭21移位之方向相反，以使該鏡頭21回復至原位，也就 是回復至該SMA線1〇之中間活動段12未受熱收縮之前的位 置。至於該回復彈性件3〇之彈性型態如壓縮彈簧或伸張式 彈簧、數目或設立位置並不限制，如：可利用一壓縮彈簧 設立在鏡頭21與物側外蓋（圖未示）之間如圖ι_3所示設 在鏡頭21之上端，以對鏡頭21提供一與sma線10收縮牽引 力反向之壓縮彈簧力；亦可利用一伸張式彈簧設立在鏡頭 21因SMA線10收縮而牽引移位之相反端（圖未示，即如圖 1-3設在鏡頭21之下端），以對鏡頭21提供一與SMA線1〇 收縮牽引力相反之伸張彈簧力，用以將鏡頭21朝原位拉 回0 10 200916872 本實施例進一步可在鏡頭21與容腔20之間設置一組相 對應配合之導軌裝置26，如利用鏡頭模組2之容腔20之外 緣處與鏡頭21較接近或密接的架體27上設置一與鏡頭21相 配合之導軌裝置26 ’如在架體27及鏡頭21之間分別設置可 對應配合之導槽261及導軌262，以使鏡頭21可藉該導軌 裝置26而在容腔20内穩定地滑動移位；至於該導執裝置26 之設立位置及數目並不限制，可視鏡頭21滑動之穩定性需 要及/或架體26與鏡頭21之間的組裝型態而選擇導軌裝置 26之設立位置及數目。 <第二實施例> 參考圖4-6所示，本實施例係利用二條SMA線1〇，該 二條SMA線10係以環周緣對稱或等間距佈設在鏡頭21之外 周緣處為佳；本實施例之二條SMA線1〇其各二相對端^係 固定在鏡頭21外緣之二對稱邊上，且使各中間活動段12分 別以其長度向中間點13各自拉緊懸掛在分別設於鏡頭21外 緣之對稱邊上之鉤件25上，使各SMA線1〇之中間活動段12 相對於二相對端11形成緊張狀態；藉上述結構，當二條 SMA線10因電流導通而受熱時，各SMA線1〇之中間活動段 同步收縮並牵引鏡頭21上之對應鉤件邪，藉以同步驅 動該鏡頭21在光轴X上滑動移位而達成自動對焦效果。 。本實施例進一步可在鏡頭21上配置一回復彈性件3 〇如 彈簧或彈片’當SMA線1〇因電流切斷而冷卻致膨脹回復至 原來長度時，該回復彈性件30可對鏡頭21提供一與SMA線 W收縮牽引力反向之回復力以使該鏡頭21回復至原位。 本實施例進一步可在鏡頭21與容腔20之間設置一組導 執農置26 ’該導執裝置26係設置在鏡頭21之外周緣上二條 SMA線1〇之間的一側邊上，以使鏡頭21可藉該組導執裝置 200916872 26而在容腔20内穩定地滑動移位。 又本實施例亦可在鏡頭21與容腔20之間設置二組導軌 裝置26，該二組導軌裝置26可配合二條SMA線10而以對稱 方式設置或以鄰接方式設置；以鏡頭21之外周緣所形成的 圓形當作一 X-Y面並分成四個象限為例說明，當以對稱方 式設置時，該二條SMA線10係分別設於第一、三象限而二 組導軌裝置26分別設於第二、四象限。當以鄰接方式設置 時，二條SMA線10條分別設於第一、二象限而二組導軌裝 置26分別設於第三、四象限，也就是，若以圊4-6所示方 形體之四侧邊為例說明，該二條之SMA線10係佈設在鏡頭 外周緣相鄰之二侧邊處，並使各SMA線10之二相對端固定 住，而各中間活動段則分別拉緊懸掛在鏡頭外緣上一對應 鉤件上，而二組導軌裝置26則設置於二條SMA線1〇之對面 側邊處。 而設置一組或二組導軌裝置26之主要目的係使鏡頭21 可藉該導軌裝置26而在容腔20内穩定地滑動移位。一般而 言’第二實施例中設有二條SMA線10，致其收縮牵引力的 作用效果比第一實施例只設一條SMA線10為佳。 <第三實施例> 參考圖7-9所示，本實施例係利用四條SMA線1〇 ’該 四條SMA線10係以環周緣對稱或等間距佈設在鏡頭21之外 周緣處為佳，也就是四條SMA線10之各二相對端11係分別 固定在鏡頭21之四對邊上，使各SMA線10之中間活動段12 分別以其長度向中間點13各自拉緊懸掛在鏡頭21外緣之相 對邊上對應設立之鉤件25上，使各SMA線10之中間活動段 12相對於二相對端11形成緊張狀態；藉上述結構，當四條 SMA線10因電流導通而受熱時，各SMA線10之中間活動段 12 200916872 12可同步收縮並牽引鏡頭21上之對應鉤件25，藉以同步驅 動該鏡頭21在光軸X上滑動移位而達成自動對焦效果。 本實施例進一步可在鏡頭21上配置一回復彈性件3〇如 彈簧或彈片，當SMA線10因電流切斷而冷卻致膨脹回復至 原來長度時，該回復彈性件30可對鏡頭21提供—與SMA線 10收縮牽引力反向之回復力以使該鏡頭21回復至原位。 由於本實施例之四條SMA線1〇係固定在鏡頭21之四對 邊上’可對鏡頭21提供平衡之收縮牽引力，基本上已可使 鏡頭21在容腔20内穩定地滑動移位，故以本實施例而言， 該導軌裝置26可視需要而選擇設置或不設置。又若搭配適 當之影像品質回授（feedback )機制以分別調控四條sma 線’則可精密微调鏡頭之傾斜（tilt)，可更進步增 進影像品質。 日 本發明之結構設計與習知者比較，至少可具有下列優 點： ’、 < 1 >、本發明之SMA線10不須藉其他連動機構如制 動器（actuator )、扳機（trigger )或其他相類似之槓 桿裝置等而可直接驅動鏡頭21滑動移位，可簡化鏡頭自動 對焦移位機構之結構及運動方式，符合鏡頭模組小型化及 降低成本之設計要求，有利於量產化。 < 2 >、本發明可耐迴焊（reflow )高溫，可提高量 產化之可能性。 < 3 >、本發明之SMA線10之中間活動段12的長度向 中間點13係拉緊懸掛在鏡頭21外緣之一鉤件25上，使SMA 線10呈“V”型架構，故可得到較長的行程，也就是使用 相同之SMA線10，其收縮牵引力可對鏡頭21提供較長的移 13 200916872 位量；且可藉電子電路之回授控制或SMA線10之長度-溫 度-阻抗之間的關係，可精確控制鏡頭21的移位量，也就 是可精確控制鏡頭21之對焦位置。 < 4 >、本發明若利用二條或以上之SMA線10並環周 緣對稱或等間距佈設在鏡頭21之外周緣處如第三實施例， 則可搭配適當之影像品質回授（feedback )機制以分別調 控各條SMA線10，可藉以補正鏡頭21之傾斜或偏搖 (tilt/yaw/pitch )。 以上所述僅為本發明的較佳實施例，對本發明而言僅 是說明性的’而非限制性的；本專業技術人員理解，在本 發明權利要求所限定的精神和範圍内可對其進行許多改 變’修改，甚至等效變更，但都將落入本發明的保護範圍 内。 【圖式簡單說明】 圖1係本發明第一實施例之立體示意圖。 圖2係圖1之上視示意圖。 圖3係圖1 一侧面示意圖。 圖4係本發明第二實施例之立體示意圖。 圖5係圖4之上視示意圖。 圖6係圖4 一側面示意圖。 圖7係本發明第三實施例之立體示意圖。 圖8係圖7之上視示意圖。 圖9係圖7 —侧面示意圖。 【主要元件符號說明】 鏡頭移位機構1 形狀記憶合金線/SMA線1 〇 相對端11 200916872 中間活動段12 長度向中間點（longitudinal mid-point ) 13 鏡頭模組2 容腔20 鏡頭21 鏡片群22 鏡頭炎持部（lens holder) 23 架體24 鉤件25 導執裝置26 〔 導槽261 導軌262 架體27 回復彈性件30Another object of the present invention is to provide a lens shifting mechanism using a shape memory alloy _(SMA)_, which can utilize more than one 8 黯 line such as = strip or three or four, etc., so that the SMA lines are around the circumference The symmetry or equal = is arranged at the periphery of the lens, and the two SMA wires are opposite to each other, and the intermediate movable segments between the opposite ends are respectively hung on the outer edge of the lens. Correspondingly, the intermediate movable section of each MA line forms a tension state with respect to the opposite ends of the two MA lines; by the v structure, when the SMA lines are heated by the synchronous current conduction, the intermediate movable section of each sma can be synchronously contracted. And the corresponding hook member on the lens is pulled to synchronously drive the lens to slide and shift on the optical axis to achieve an autofocus effect. Another object of the present invention is to provide a lens shifting mechanism using a shape memory alloy j SMA ), which can further configure a returning ryS element on the lens to cool the SMA wire due to current cutoff. And when the expansion returns to the original length, the recovery elastic member can restore the force to restore the lens to the original position to achieve the self-brother, and the other purpose is to provide a corresponding arrangement between the edges of the shape memory alloy. In conjunction with the rail device, the walls should be matched so that the lens can be slidably moved within the cavity. [Embodiment] In order to make the present invention more clear and detailed, the following diagrams are preferred. The structure of the present invention and its technical features are detailed and matched with the implementation of the present invention disclosed in the following six examples. The lens of the present invention is explained by the main constituent elements of the 200916872 position mechanism or directly related components. Therefore, the embodiments disclosed in the present invention are applied to an autofocus lens module, but generally have an autofocus lens. In addition to the lens shifting mechanism disclosed in the present invention, other structures are generally notified techniques, and thus those skilled in the art are generally aware that the present invention discloses an autofocus lens module. The constituent elements are not limited to the structure of the embodiment disclosed below, that is, the constituent elements of the autofocus lens module can be changed, modified, or even changed in an equivalent manner, for example, the cavity of the lens module ( The shape design of the housing is not limited, that is, the internal space design of the lens module is not limited; or by the lens group_( lens group And the overall shape or structure of a lens henna group lens is not limited, such as the lens (the ratio of (10) may include a lens group consisting of a single lens or a plurality of lenses, and a single lens sheet The group can be firstly disposed in a fixing member and then combined with a lens missing portion (=ns h〇ider) to form a lens; or the shape or structure of the lens holder is not limited. It can be assembled in various designs for assembling the lens module, the internal space, the housing, the other components, or the like to form a lens module; or the SMA wire The number of lines used and the number of lenses driven are also limited. One lens can be driven by one SMA wire or one lens or multiple lenses can be driven by multiple sets of sma lines. Referring to Figures 1-3, there are shown in perspective, top and side views, respectively, of an embodiment of the present invention. The invention utilizes a shape memory alloy (SMA) head shifting machine 1 which can be applied to an autofocus lens module 2, wherein the middle lens module 2 basically comprises at least a cavity (head) 21 The optical axis X in the cavity 2 is slidably displaced; the mirror comprises a lens group (lenS) or a plurality of lenses (such as two mirrors), a lens group 22 and a lens group The lens of 22 holds the lens holder 23, that is, the lens group 22 and the lens clamping portion 23-200916872 form a lens 21 that can be moved synchronously, and is sleeved in the cavity 2〇 and can be photographed in the light. Sliding shift on X 'but the configuration or assembly type of the lens 21 including the lens group 22 or the lens holder 23 is not limited. The lens shifting mechanism 1 of the present invention comprises at least one shape memory alloy wire (abbreviated as SMA wire) 1〇, which can generate a structure of the 麻田散/沃斯田铁 structure with the application of the temperature of the SMA wire. (martensite/austenite transformation) characteristics; when an SMA wire (or SMA device) is heated to reach between the austenitic start temperature and the austenitic finish temperature, It can exhibit "heat shrinkage" characteristics; when it is cooled to between the martensite start temperature and the martensite finish temperature, it can exhibit "cold expansion" characteristics. The current is turned on by the SMA wire to cause the temperature to rise and fall and its heat shrinkage: the lens 21 can be slidably displaced. The invention is characterized in that the SMA wire 10 has two opposite ends 11 and an intermediate movable portion 12 interposed between the opposite ends 11, wherein the opposite ends 11 are fixed, such as It can be fixed on the frame 24 at the outer edge of the cavity 2 of the lens module 2. The fixing manner of the opposite ends π is not limited, and includes different methods such as curing, sticking, and welding, but It is better to complete the solid processing. The intermediate movable section 12 is longitudinally suspended from the longitudinal mid-point 13 series on the outer edge of the lens 21 on a corresponding hook member 25, wherein the corresponding hook member 25 can be disposed on the fixing member of the lens group 22. The outer edge is disposed on the outer edge of the lens holder 23 so that the intermediate movable section 12 can form a tension state relative to the opposite ends 11 after the hook member 25 is suspended; When the SMA wire 10 is heated due to current conduction, the intermediate movable section 12 of the SMA wire 1 收缩 can contract and pull the hook member 25, and the 200916872 can drive the lens 21 to slide on the optical axis to achieve an autofocus effect. The present invention utilizes the number of SMA wires 10 and the manner in which each wire 1〇 is disposed outside the circumference of the lens 21, and is not limited to use one, two, and four SMA wires 10 as an embodiment, respectively, as follows: <First implementation [Examples] Referring to Figures 1-3, this embodiment utilizes an SMA wire 10, and when the object distance is far, the lens 21 is displaced away from the image side toward the object side to achieve the purpose of focusing; In the example, the distance between the lens 21 and the imaging surface changes as shown in Table 1: Table 1 Object Distance (ram) 70 100 600 1000 Infinity lens movement distance (ran ) 0.243 0.167 0.023 0.011 0 When focusing, the lens 21 is controlled to move, That is, the autofocus lens 21 is controlled by a focus button (not shown). When the user presses the focus button, the lens shift mechanism 1 can be powered by the electrodes 31, 32, when the current is controlled. After flowing through the SMA wire 10, Joule heat can be generated due to the impedance of the SMA wire 10, so that the SMA wire 10 is heated and contracted, and the length, temperature and control current of the SMA wire 10 are approximately linear. And can be contracted by SMA line 10 The appropriate displacement of the lens 21 is controlled by the amount to change the distance between the lens 21 and the imaging surface for the purpose of focusing. In the present embodiment, the SMA wire 10 is made of a nickel-titanium alloy wire having a wire diameter of 0.002", and the control current and the length of the SMA are respectively shown in Table 2. 200916872 Object distance (mm) 70 100 600 1000 Infinity Lens movement distance (mm) 0.243 0.167 0.023 0.011 0 Control current (mA) 50 35 20 15 0 The above structure and conductive connection method for supplying power to the lens shift mechanism 1 via the electrodes 31, 32, including by circuit board or electronic The line is used to control the conduction or disconnection of the current passing through the SMA wire 10 and the current intensity through the SMA wire 1 , etc., and is not limited to the fact that the design is not a major component of the lens shifting mechanism 1 of the present invention. The present invention can further configure a return spring element 30 such as a spring on the lens 21, which is not characterized by the present invention. Or the elastic piece, when the SMA wire 10 is cooled and the expansion is restored to the original length due to the current cut, the return elastic member 30 can provide the lens 21 with a contraction traction force with the SMA wire 10. Recovering the force, that is, the direction in which the intermediate movable section 12 of the SMA wire 10 is displaced by the contraction of the traction lens 21 is reversed to return the lens 21 to the home position, that is, to the middle of the SMA wire 1〇 The movable section 12 is not subjected to the position before the heat shrinkage. As for the elastic type of the return elastic member 3, such as a compression spring or a tension spring, the number or the setting position is not limited, for example, a compression spring can be used to establish the lens 21 and the object. A side cover (not shown) is disposed at the upper end of the lens 21 as shown in FIG. 1 to provide a compression spring force to the lens 21 opposite to the contraction traction force of the sma line 10; and may also be established by using a tension spring The lens 21 is pulled by the opposite end of the displacement of the SMA wire 10 (not shown, as shown in FIG. 1-3 at the lower end of the lens 21) to provide the lens 21 with a stretch spring opposite to the SMA wire 1 〇 contraction traction force. The force is used to pull the lens 21 back to the original position. 0 10 200916872 This embodiment further provides a set of corresponding matching rail devices 26 between the lens 21 and the cavity 20, such as the cavity 20 of the lens module 2 The outer edge is closer to the lens 21 or A guide rail device 26 ′ is disposed on the frame body 27, and a guide groove 261 and a guide rail 262 are respectively disposed between the frame body 27 and the lens 21, so that the lens 21 can be used by the lens device 26 is stably slidably displaced in the cavity 20; the position and number of the guiding device 26 are not limited, and the stability of the sliding of the visible lens 21 is required and/or the assembled type between the frame 26 and the lens 21. The position and number of the rail devices 26 are selected. <Second Embodiment> Referring to Figs. 4-6, in the present embodiment, two SMA wires 1 are used, and the two SMA wires 10 are preferably arranged at the periphery of the lens 21 at a circumferentially symmetric or equidistant spacing. The two SMA wires 1 of the embodiment are fixed on the two symmetrical sides of the outer edge of the lens 21, and the intermediate movable segments 12 are respectively slid and suspended by the length to the intermediate point 13 respectively. The hook member 25 is disposed on the symmetrical edge of the outer edge of the lens 21, so that the intermediate movable portion 12 of each SMA wire 1 is formed in a state of tension with respect to the opposite ends 11; by the above structure, when the two SMA wires 10 are electrically connected When heated, the intermediate movable section of each SMA line is synchronously contracted and the corresponding hook element on the lens 21 is pulled, so that the lens 21 is synchronously driven to slide on the optical axis X to achieve an autofocus effect. . In this embodiment, a resilience elastic member 3 such as a spring or a spring piece can be disposed on the lens 21. When the SMA wire 1 冷却 is cooled by the current cut and the expansion returns to the original length, the return elastic member 30 can provide the lens 21 A restoring force that reverses the contraction of the SMA wire W to return the lens 21 to its original position. In this embodiment, a set of guides 26 can be disposed between the lens 21 and the cavity 20. The guide device 26 is disposed on one side of the two SMA wires 1 之外 on the outer periphery of the lens 21, The lens 21 can be stably slidably displaced within the cavity 20 by the set of guiding devices 200916872 26. In this embodiment, two sets of rail devices 26 may be disposed between the lens 21 and the cavity 20, and the two sets of rail devices 26 may be disposed in a symmetrical manner or in an abutting manner in conjunction with the two SMA wires 10; The circular shape formed by the rim is taken as an XY plane and divided into four quadrants. When symmetrical, the two SMA wires 10 are respectively disposed in the first and third quadrants, and the two sets of rail devices 26 are respectively disposed on Second and fourth quadrants. When arranged in an abutting manner, the two SMA wires 10 are respectively disposed in the first and second quadrants, and the two sets of the rail devices 26 are respectively disposed in the third and fourth quadrants, that is, if the square body is shown as 圊4-6 As an example, the two SMA wires 10 are arranged at two adjacent sides of the outer periphery of the lens, and the opposite ends of the SMA wires 10 are fixed, and the intermediate movable segments are respectively hung and suspended. The outer edge of the lens is on a corresponding hook member, and the two sets of rail devices 26 are disposed on opposite sides of the two SMA wires 1〇. The primary purpose of providing one or two sets of rail assemblies 26 is to allow the lens 21 to be stably slidably displaced within the cavity 20 by the rail assembly 26. In general, the second embodiment is provided with two SMA wires 10, so that the effect of contracting the traction force is better than the provision of only one SMA wire 10 in the first embodiment. <Third Embodiment> Referring to Figs. 7-9, the present embodiment utilizes four SMA wires 1 〇 'the four SMA wires 10 are preferably arranged at the periphery of the lens 21 at a circumferentially symmetric or equidistant spacing. That is, the opposite ends 11 of the four SMA wires 10 are respectively fixed on the four opposite sides of the lens 21, so that the intermediate movable segments 12 of the SMA wires 10 are respectively hung and suspended to the lens 21 with their lengths toward the intermediate point 13 respectively. The opposite side of the outer edge of the corresponding hook member 25, the intermediate movable section 12 of each SMA wire 10 is in a state of tension with respect to the opposite ends 11; with the above structure, when the four SMA wires 10 are heated by current conduction, The intermediate movable section 12 of each SMA wire 10 200916872 12 can synchronously contract and pull the corresponding hook member 25 on the lens 21, thereby synchronously driving the lens 21 to slide and shift on the optical axis X to achieve an autofocus effect. In this embodiment, a resilience elastic member 3 such as a spring or a spring piece can be disposed on the lens 21. When the SMA wire 10 is cooled by the current cut to cause the expansion to return to the original length, the return elastic member 30 can provide the lens 21. The restoring force is reversed from the contraction of the SMA wire 10 to return the lens 21 to its original position. Since the four SMA wires 1 of the embodiment are fixed on the four opposite sides of the lens 21, a balanced contraction traction force can be provided to the lens 21, and the lens 21 can be stably slidably displaced in the cavity 20, so In the present embodiment, the rail device 26 can be selected or not provided as needed. If you use the appropriate image quality feedback mechanism to adjust the four sma lines separately, you can fine-tune the tilt of the lens to improve the image quality. The structural design of the Japanese invention has at least the following advantages compared with the prior art: ', < 1 >, the SMA wire 10 of the present invention does not have to borrow other linkage mechanisms such as an actuator, a trigger or the like. Similar to the lever device and the like, the lens 21 can be directly driven to slide, which can simplify the structure and movement mode of the lens autofocus shifting mechanism, and meet the design requirements of miniaturization and cost reduction of the lens module, which is advantageous for mass production. < 2 > The present invention is resistant to reflow high temperature and can increase the possibility of mass production. < 3 >, the length of the intermediate movable section 12 of the SMA wire 10 of the present invention is tensioned toward the intermediate point 13 and hung on one of the hook members 25 of the outer edge of the lens 21, so that the SMA wire 10 has a "V" type structure. Therefore, a longer stroke can be obtained, that is, using the same SMA wire 10, the contraction traction can provide a longer shift of the lens 21 to the amount of 200916872; and can be controlled by electronic circuit feedback or the length of the SMA wire 10 - The relationship between the temperature and the impedance can precisely control the amount of shift of the lens 21, that is, the focus position of the lens 21 can be precisely controlled. < 4 >, the present invention can be used with two or more SMA wires 10 and circumferentially symmetrically or equally spaced around the periphery of the lens 21 as in the third embodiment, and can be matched with appropriate image quality feedback. The mechanism is to adjust the SMA lines 10 separately to correct the tilt or yaw/pitch of the lens 21. The above is only the preferred embodiment of the present invention, and is intended to be illustrative only and not limiting; it is understood by those skilled in the art that Many changes, modifications, and even equivalents are possible, but are intended to fall within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment of the present invention. Figure 2 is a top plan view of Figure 1. Figure 3 is a side view of Figure 1. Figure 4 is a perspective view of a second embodiment of the present invention. Figure 5 is a top plan view of Figure 4. Figure 6 is a side view of Figure 4. Figure 7 is a perspective view of a third embodiment of the present invention. Figure 8 is a top plan view of Figure 7. Figure 9 is a side view of Figure 7. [Major component symbol description] Lens shifting mechanism 1 Shape memory alloy wire / SMA wire 1 〇 opposite end 11 200916872 Intermediate movable section 12 Length to midpoint (longitudinal mid-point) 13 Lens module 2 Cavity 20 Lens 21 Lens group 22 lens holder (lens holder) 23 frame 24 hook member 25 guide device 26 [guide groove 261 guide rail 262 frame 27 return elastic member 30
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