201104350 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及相機模組技術，特別涉及一種具有電致伸縮 聚合物快門裝置之相機模組。 【先前技術】 [0002] 快門裝置係相機模組上控制感光元件（如感光片、影像 感測器等）有效曝光時間之一種裝置，比如，快門速度 為1 / 2秒時’表示感光元件曝光之時間為1 / 2❹拍攝前， 該快門裝置關閉’其可防止相機模組内之感光元件曝光 ;拍攝時’調整好快門速度，按下快門釋放按鈕（即拍 照按鈕），在快門開啟與閉合之間隙間，讓光線藉由快 門裝置到達感光元件，使感光元件獲得正確之曝光。具201104350 VI. Description of the Invention: [Technical Field] The present invention relates to camera module technology, and more particularly to a camera module having an electrostrictive polymer shutter device. [Prior Art] [0002] A shutter device is a device for controlling the effective exposure time of a photosensitive element (such as a photosensitive film, an image sensor, etc.) on a camera module, for example, when the shutter speed is 1/2 second, it indicates that the photosensitive element is exposed. The time is 1 / 2 前 before shooting, the shutter device is turned off 'It prevents the photosensitive element in the camera module from being exposed; when shooting 'Adjust the shutter speed, press the shutter release button (ie the camera button), the shutter opens and closes Between the gaps, the light reaches the photosensitive element through the shutter device, so that the photosensitive element obtains the correct exposure. With
體請參閱Myung-Jin Chung等人2007年10月在Control， Automation and Systems， 2007. ICCAS 07. International Conference on ( Page(s):2319 - 2322)上發表之論文Development of Compact Camera Module Having Auto Focus Actuator and Mechanical Shutter System for Mobi1e Phone 〇 闺常見之相機模組之快門裝置主要包括電子快門與機械快 門。其中，電子快門係用電路控籠門線圈磁鐵之原理 來控制快門時間；機械快Η係利用齒輪傳動控制快門時 間。然而’電子快門與機械快門均需要藉由設計複雜、 精禮之機械連接傳動結構控制開門之開啟與關閉，其價 格ρ貝在工作過程中會因零件間之摩擦而發出雜訊， 098125129 表單編號Α0101 第4頁/共21頁 0982043006-0 201104350 [0004] [0005] [0006] Ο ο 且其響應速度較慢，影響相機模組之成像品質。 因此，有必要提供一種具有結構簡單、無雜訊、且響應 速度較快之快門裝置之相機模組。 【發明内容】 下面將以具體實施例說明一種相機模組。 一種相機模組’包括鏡頭模組、影像感測器及快門裝置 ，該影像感測器及快門裝置之中心均位於鏡頭模組光軸 ，該快門裝置包括框架’收容於該框架内之電致伸縮單 元，該電致伸縮單元包括第一電致伸縮聚合物層、分別 設在該第一電致伸縮聚合物層相對兩表面上之兩個柔性 電極層、以及分別設在該兩個柔性電極層遠離該第一電 致伸縮聚合物層之相背離之兩個表面上之兩個第二電致 伸縮聚合物層，該第一電致伸縮聚合物層沿鏡頭模組光 軸方向之厚度大於該第二電致伸縮聚令物層沿鏡頭模組 光轴方向之厚度’該電致伸縮單元之中心開設有一貫穿 該第一電致伸縮聚合物層、兩，個柔性電極層與兩個第二 電致伸縮聚合物層之通孔，該通孔之中心軸與鏡頭模組 之光袖同轴，當施加於該電致伸縮單元之兩個柔性電極 層之間之電壓改變時，該電致伸縮單元沿垂直於鏡頭模 組光軸方向伸展或收縮’從而改變該通孔之大小以調節 透過該通孔之通光量。 [0007] 098125129 相較於先前技術’本技術方案之相機模組之快門裝置包 括框架與收容於框架内之電致伸縮單元，且該電致伸縮 單元包括第一電致伸縮聚合物層、兩個柔性電極層與兩 個第二電致伸縮聚合物層，電致伸縮單元中心開設一通 表單編號Α0101 第5頁/共21頁 0982043006-0 201104350 孔’藉由施加於該兩雜性電極層之電壓之改變以控制 乂匕孔之大小，其結構簡單 '無雜訊、且響應速度較快 ’並且’兩個柔性電極層設於第—電致伸縮聚合物層相 兩表面，且兩個柔性電極層兩側均設有一個比第一 電致伸縮聚合物層之厚度薄之第二電致伸縮聚合物層， »亥兩個第_電致伸縮聚合物層可有效隔離兩個柔性電極 層與外界之接觸，避免該兩㈣性電極層被外界潮濕之 空氣氧化而影響其導電性能’且較薄第二電致伸縮聚合 物層對快Η裝置之響應速度轉不太，從而提高該快門 裝置之使用壽命與響應之穩定性與精確度。 【實施方式】 ' [0008] [0009] [0010] 下面將結合附圖與實施例對本技術方案之相機模組作進 一步詳細說明。 請參閲圖1 ’本技術方案第一實施例提供一種相機模組 1〇〇。相機模組1〇〇包括鏡頭模組1〇、影像感測器2〇及快 門裝置3〇。影像感測器20及快門裝置3〇之中心均位於鏡 頭模組10之光軸上。 鏡頭模組10包括鏡座〗丨、鏡筒12、鏡片組13。鏡筒12藉 由螺紋配合旋合於鏡座丨丨。鏡片組13收容於鏡筒12内。 本實施例中，鏡座11内開設有第一收容孔lu與第二收容 孔112。鏡筒12藉由設置於其外壁之外螺紋及第一收容孔 ill内壁之内螺紋與鏡座u間相旋合固定。鏡筒12開設有 收容孔121。鏡片組13包括兩個鏡片，兩個鏡片依次設置 在收容孔121内。 098125129 影像感測器2 0收容於第二收容孔11 2内 表單編號A0101 第6頁/共21頁 影像感測器2 0靠 0982043006-0 [0011] 201104350 近鏡片組I3之一側設有一透明板21。透明板2丨主要用於 保護影像感測器2 〇，防止灰塵進入到影像感測器2 0内， 以使影像感測器20具有良好之成像品質。 [0012] 請進一步參閱圖2-5，快門裝置30包括框架32與電致伸縮 單元34。電致伸縮單元34收容於框架32内。本實施例中 ，電致伸縮單元34在垂直於鏡頭模組1〇光轴方向之戴面 為正方形。 [0013] Ο 具體地’框架32包括上框321與下框322。上框321具有 一個與鏡頭模組10光轉平行之頂板323，下框322具有— 個與鏡頭模組10光軸平行之底板324，頂板323與底板 324相對。框架32之中心開設有貫穿頂板323與底板324 且與鏡頭模組10之光軸相對應之通光孔,302^通光孔3〇2 之大小對應於拍照時快門裝置3 〇開啟之最大通光口徑。 ❹ [0014] 上框321與下框322組合後形成一個收容腔304。收容腔 304用於收容電致伸縮單元34，以可保護支撐電致伸縮單 元34。當然，框架32爽可以在電致伸縮單元34製作完成 後一體形成於電致伸縮單元34週邊。 電致伸縮單元34包括第一電致伸縮聚合物層341、兩個柔 性電極層342與兩個第二電致伸縮聚合物層343。第一電 致伸縮聚合物層341具有相對之第一表面3411與第二表面 3412 °兩個柔性電極層342分別設在第一電致伸縮聚合物 層341相對之第一表面3411與第二表面3412上。兩個柔 性電極層342分別具有遠離第一電致伸縮聚合物層341之 相背離之表面3421。兩個第二電致動聚合物層343分別設 在兩個柔性電極層342遠離第一電致伸縮聚合物層341之 098125129 表單編號A0101 第7頁/共21頁 0982043006-0 201104350 相背離之兩個表面3421上。第一電致伸縮聚合物層341沿 鏡頭模組10光軸方向之厚度大於該第二電致伸縮聚合物 層342沿鏡頭模組10光軸方向之厚度。優選地，第一電致 伸縮聚合物層341沿鏡頭模組1 0光轴方向之厚度為 0. 2-0. 8mm之間之任一數值，第二電致伸縮聚合物層343 沿鏡頭模組10光軸方向之厚度為0. 〇 2 - 0. 1 5 mm之間之任 一數值。柔性電極層342沿鏡頭模組10光軸方向之厚度優 選為1 0-200 vm之間之任一數值。 [0015] 電致伸縮單元34之中心開設有一貫穿第一電致伸縮聚合 f % %： j 物層341、兩個柔性電極層342與兩個第二電致伸縮聚合 物層343之通孔305。通孔305之中心轴與鏡頭模組10之 光軸同軸。當施加於電致伸縮單元34之兩個柔性電極層 342之間之電壓改變時，電致伸縮單元34沿垂直於鏡頭模 組10光軸方向伸展或收縮，從而改變通孔305之大小以調 節透過通孔305之通光量。 [0016] 優選地，第一電致伸縮聚合物層341與第二電致伸縮聚合 物層343可選自矽樹脂（Silicone)、聚氨酯彈性體（ 、For more information, see Myung-Jin Chung et al., October 2007, Control, Automation and Systems, 2007. ICCAS 07. International Conference on (Page(s): 2319 - 2322). Development of Compact Camera Module Having Auto Focus Actuator and Mechanical Shutter System for Mobi1e Phone 〇闺 The shutter unit of the common camera module mainly includes an electronic shutter and a mechanical shutter. Among them, the electronic shutter system uses the principle of the circuit control cage coil magnet to control the shutter time; the mechanical fast system uses the gear transmission to control the shutter time. However, both the electronic shutter and the mechanical shutter need to control the opening and closing of the door by a complicated and delicate mechanical connection transmission structure. The price of the shutter is due to the friction between the parts during the work, and the 098125129 form number Α0101 Page 4 of 21 0982043006-0 201104350 [0004] [0005] [0006] ο ο and its slow response speed affects the imaging quality of the camera module. Therefore, it is necessary to provide a camera module having a shutter device having a simple structure, no noise, and a fast response speed. SUMMARY OF THE INVENTION A camera module will be described below with specific embodiments. A camera module includes a lens module, an image sensor and a shutter device. The center of the image sensor and the shutter device are located on the optical axis of the lens module, and the shutter device includes a frame that is electrically received in the frame. a telescopic unit comprising a first electrostrictive polymer layer, two flexible electrode layers respectively disposed on opposite surfaces of the first electrostrictive polymer layer, and two flexible electrodes respectively disposed on the two The layer is away from the two second electrostrictive polymer layers on the two surfaces facing away from the first electrostrictive polymer layer, and the thickness of the first electrostrictive polymer layer along the optical axis of the lens module is greater than a thickness of the second electrostrictive polymer layer along the optical axis of the lens module. The center of the electrostrictive unit has a first electrostrictive polymer layer, two flexible electrode layers and two a through hole of the electrostrictive polymer layer, the central axis of the through hole being coaxial with the optical sleeve of the lens module, when the voltage applied between the two flexible electrode layers of the electrostrictive unit is changed, the electricity Telescopic single The element extends or contracts perpendicularly to the optical axis of the lens module to change the size of the through hole to adjust the amount of light transmitted through the through hole. [0007] 098125129 The shutter device of the camera module of the prior art has a frame and an electrostrictive unit housed in the frame, and the electrostrictive unit comprises a first electrostrictive polymer layer, two a flexible electrode layer and two second electrostrictive polymer layers, the center of the electrostrictive unit is opened by a form number Α0101, page 5 / 21 pages 0982043006-0 201104350 hole 'by being applied to the two impurity electrode layers The change of voltage to control the size of the pupil, the structure is simple 'no noise, and the response speed is faster' and 'two flexible electrode layers are provided on the two surfaces of the first electrostrictive polymer layer, and two flexible A second electrostrictive polymer layer thinner than the thickness of the first electrostrictive polymer layer is disposed on both sides of the electrode layer, and the two _electrostrictive polymer layers are effective to isolate the two flexible electrode layers Contact with the outside world to prevent the two (four) electrode layers from being oxidized by the humid air outside to affect the conductive performance' and the thinner second electrostrictive polymer layer does not change the response speed of the quick-twist device, thereby improving Stability and response of the service life of the shutter means with accuracy. [Embodiment] [0009] [0010] The camera module of the present technical solution will be further described in detail below with reference to the accompanying drawings and embodiments. Please refer to FIG. 1 ' The first embodiment of the technical solution provides a camera module 1 〇〇. The camera module 1 includes a lens module 1A, an image sensor 2A, and a shutter device 3A. The centers of the image sensor 20 and the shutter device 3 are located on the optical axis of the lens module 10. The lens module 10 includes a lens holder 丨, a lens barrel 12, and a lens group 13. The lens barrel 12 is screwed to the mirror holder by a threaded fit. The lens group 13 is housed in the lens barrel 12. In this embodiment, the first receiving hole lu and the second receiving hole 112 are defined in the lens holder 11. The lens barrel 12 is screwed and fixed to the mirror frame u by the external thread provided on the outer wall of the outer wall and the inner thread of the inner wall of the first receiving hole ill. The lens barrel 12 is provided with a receiving hole 121. The lens group 13 includes two lenses, and the two lenses are sequentially disposed in the receiving holes 121. 098125129 Image sensor 2 0 is housed in the second receiving hole 11 2 Form No. A0101 Page 6 / 21 page image sensor 2 0 by 0982043006-0 [0011] 201104350 One side of the lens group I3 is transparent Board 21. The transparent plate 2 is mainly used to protect the image sensor 2 〇 to prevent dust from entering the image sensor 20 to make the image sensor 20 have good image quality. [0012] Referring further to FIGS. 2-5, the shutter assembly 30 includes a frame 32 and an electrostrictive unit 34. The electrostrictive unit 34 is housed in the frame 32. In this embodiment, the electrostrictive unit 34 has a square shape in a direction perpendicular to the optical axis of the lens module 1. [0013] The frame 32 specifically includes an upper frame 321 and a lower frame 322. The upper frame 321 has a top plate 323 parallel to the lens module 10, and the lower frame 322 has a bottom plate 324 parallel to the optical axis of the lens module 10, and the top plate 323 is opposite to the bottom plate 324. The center of the frame 32 is provided with a light-passing hole penetrating through the top plate 323 and the bottom plate 324 and corresponding to the optical axis of the lens module 10. The size of the 302^ light-passing hole 3〇2 corresponds to the maximum opening of the shutter device 3 when the camera is photographed. Light caliber. [0014] The upper frame 321 and the lower frame 322 are combined to form a receiving cavity 304. The receiving cavity 304 is for receiving the electrostrictive unit 34 to protect the supporting electrostrictive unit 34. Of course, the frame 32 can be integrally formed around the electrostrictive unit 34 after the electrostrictive unit 34 is completed. The electrostrictive unit 34 includes a first electrostrictive polymer layer 341, two flexible electrode layers 342, and two second electrostrictive polymer layers 343. The first electrostrictive polymer layer 341 has a first surface 3411 opposite to the second surface 3412. Two flexible electrode layers 342 are respectively disposed on the first surface 3411 and the second surface of the first electrostrictive polymer layer 341. On the 3412. The two flexible electrode layers 342 each have a surface 3421 away from the first electrostrictive polymer layer 341. Two second electrically actuated polymer layers 343 are respectively disposed at 098125129 of the two flexible electrode layers 342 away from the first electrostrictive polymer layer 341. Form No. A0101 Page 7 / 21 pages 0982043006-0 201104350 On the surface 3421. The thickness of the first electrostrictive polymer layer 341 along the optical axis direction of the lens module 10 is greater than the thickness of the second electrostrictive polymer layer 342 along the optical axis of the lens module 10. Preferably, the thickness of the first electrostrictive polymer layer 341 along the optical axis of the lens module 10 is between 0. 2-0. 8mm, the second electrostrictive polymer layer 343 along the lens mode The thickness of the group 10 optical axis direction is any value between 0. 〇2 - 0. 1 5 mm. The thickness of the flexible electrode layer 342 along the optical axis direction of the lens module 10 is preferably any value between 10 and 200 vm. [0015] The center of the electrostrictive unit 34 defines a through hole 305 penetrating through the first electrostrictive polymer f % % j layer 341 , the two flexible electrode layers 342 and the two second electrostrictive polymer layers 343 . . The central axis of the through hole 305 is coaxial with the optical axis of the lens module 10. When the voltage applied between the two flexible electrode layers 342 of the electrostrictive unit 34 changes, the electrostrictive unit 34 expands or contracts in a direction perpendicular to the optical axis of the lens module 10, thereby changing the size of the through holes 305 to adjust The amount of light passing through the through hole 305. [0016] Preferably, the first electrostrictive polymer layer 341 and the second electrostrictive polymer layer 343 may be selected from the group consisting of silicone, polyurethane elastomer (
Polyurethane Elastomer)或丙稀酸彈性體（Acrylic Elastomer) 等具有電致伸 縮效應之材料 。此外 ，第 一電致伸縮聚合物層341與第二電致伸縮聚合物層343既 可選擇同一種材料，亦可選擇不同之材料。柔性電極層 342可選用碳膠、金膠、銀膠、銅膠等導電膠以旋塗或印 刷之方法，或者選用石墨微粒以喷塗之方法，或者選用 鉑以濺鍍之方法，或者選用具有高彈性之奈米碳管薄膜 以黏貼之方法形成於第一電致伸縮聚合物層341相對之第 098125129 表單編號A0101 第8頁/共21頁 0982043006-0 201104350 一表面3411與第二表面3412上。第二電致伸縮聚合物層 343可藉由塗佈或黏貼之方法形成於兩個柔性電極層⑷ 遠離第一電致伸縮聚合物層341之相背離之兩個表面“Η 上。 [0017] Ο Ο [0018] 一般地，當給兩個柔性電極層342通以4-7V之電愿時，電 致伸縮單元34可產生大約5_2〇%之應變量，電致伸縮單元 之響應時間-般在幾毫秒到幾微秒之間，其響應速度較 快。例如，當快門裝置3〇之通光孔3〇2之直徑為21^時， 電致伸縮單兀34之外徑大約為1〇_4〇mm即可，當給電致 伸縮單元34施加某一特定電壓時，電致伸縮單元34之通 孔305可接近消失之程度，從而達到快門關閉之目地。當 然，為保證電致伸縮單元34之通孔3〇5完全關閉，電致伸 縮旱元34之設計外徑可適當增大。此外，電致伸縮單元 34之外徑可根據具體之第一電致伸縮聚合物層34ι、柔性 電極層342、第二電致伸縮聚合物層342所選用之材料、 厚度’以及通光孔302之大小進行設計，使得電致伸縮單 元34可有效控制通^305之開啟與關閉，從而控制透過通 光孔302之通光量。 請參閱圖6-7，本技術方案第二實施例提供之相機模組與 第一實施例提供之相機模組100大致相同，其不同之處在 於，快門裝置230之框架232採用透光材料製作形成。透 光框架232 —體形成’框架232可將電致伸縮單元234密 封於其内部。由於遂光框架232具有較好之透光性能’因 此透光框架2 3 2可不必開設通光孔°從而’該框架2 3 2可 更好地保護收容於其内部之電致伸縮單元234 ’使電致伸 098125129 表單編號A0101 第9頁/共21頁 0982043006-0 201104350 [0019] [0020] 098125129 縮單元234免受外界污染，更好地保證電致伸縮單元234 之伸展與收縮性能。並且，透光框架232可直接用作影像 感測器之透明板以保護影像感測器。本實施例中，電致 伸縮單元234在垂直於鏡頭模組光軸方向之戴面為圓形。 此外，該相機模組100之電致伸縮單元34在垂直於鏡頭模 組1〇〇光轴方向之截面還可以為其他形狀，例如可以為矩 形、三角形、多邊形等形狀，只要電致伸縮單元丨〇〇之通 孔305為圓形即可。 相較於先前技術’本技術方案孓相機模組丨〇〇之快門裝置 3〇包括框架32與收容於框架32内之電致伸縮單元34，且 該電致伸縮單元34包括第一電致伸縮聚合物層341、兩個 柔性電極層342與兩個第二電致伸縮聚合物層343，電致 伸縮單元34中心開設一通孔305 ’藉由施加於該兩個柔性 電極層342之電壓之改變以控制該通孔3〇5之大小，其結 構簡單、無雜訊、且響應速度較烤；並且，兩個柔性電 極層342設於第一電致伸縮聚合物層341相對之兩表面 3411、3412，且兩個柔性翁極層3:42兩侧均設有一個比 第一電致伸縮聚合物層341之厚度薄之第二電致伸縮聚合 物層343，該兩個第二電致伸縮聚合物層343可有效隔離 兩個柔性電極層342與外界之接觸，避免該兩個柔性電極 層342被外界潮濕之空氣氧化而影響其導電性能，且較薄 第二電致伸縮聚合物層343對快門裝置3G之響應速度影響 不大，從而提高該快Η裝置3Q之❹壽命與響應之穩定 性與精確度。 綜上所述，本發明確已符合發明專利之要件，遂依法提 第10頁/共21頁 表單編號A0101 0982043006-0 [0021] 201104350 出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。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】 [0022] [0023] 〇 [0024] [0025] [0026] [0027] [0028] ❹ [0029] 圖1係本技術方案第一實施例提供之相機模組之示意圖。 圖2係圖1之相機模組之快門裝置之快門開啟時之示意圖 Ο 圖3係圖2之快門裝置之電致伸縮單元乏示意圖。 圖4係圖1之相機模組之快門裝置之快門關閉時之示意圖 圖5係圖4之快門裝置之電致伸縮單元之示意圖。 圖6係本技術方案第二實施例提供之相機模組之快門裝置 之示意圖。 圖7係圖6之快門裝置之電致伸縮單元之示意圖。 【主要元件符號說明】 ‘ 相機模組 100 鏡頭模組 10 影像感測器 20 快門裝置 30 、 230 鏡座 11 tit. 鏡阂 12 鏡片組 13 表單編號A0101 第11頁/共21頁 0982043006-0 098125129 201104350 第一收容孔 111 第二收容孔 112 收容孔 121 透明板 21 框架 32 ' 232 電致伸縮單元 34 > 234 上框 321 下框 322 頂板 323 底板 324 通光孔 302 收容腔 304 第一電致伸縮聚合物層 1 . 柔性電極層 342 第二電致伸縮聚合物層 343 第一表面 3411 第'""表面 3412 表面 3421 通孔 305 098125129 表單編號A0101 第12頁/共21頁 0982043006-0A material having an electrostrictive effect such as Polyurethane Elastomer or Acrylic Elastomer. Further, the first electrostrictive polymer layer 341 and the second electrostrictive polymer layer 343 may be selected from the same material or different materials. The flexible electrode layer 342 can be selected by using a conductive adhesive such as carbon glue, gold glue, silver glue or copper glue for spin coating or printing, or by using graphite particles for spraying, or by using platinum for sputtering, or by using The highly elastic carbon nanotube film is formed by adhesion on the first electrostrictive polymer layer 341 opposite to the 098125129 form number A0101, page 8 / 21 pages 0982043006-0 201104350, a surface 3411 and a second surface 3412 . The second electrostrictive polymer layer 343 may be formed by coating or pasting on the two surfaces of the two flexible electrode layers (4) away from the first electrostrictive polymer layer 341. [0017] Ο Ο [0018] Generally, when two flexible electrode layers 342 are connected with a power of 4-7V, the electrostrictive unit 34 can generate a strain of about 5_2%, and the response time of the electrostrictive unit is generally Between a few milliseconds and a few microseconds, the response speed is faster. For example, when the diameter of the light-passing hole 3〇2 of the shutter device 3 is 21^, the outer diameter of the electrostrictive unit 34 is about 1〇. _4〇mm, when a certain voltage is applied to the electrostrictive unit 34, the through hole 305 of the electrostrictive unit 34 can be nearly disappeared, thereby achieving the purpose of shutter closing. Of course, to ensure the electrostrictive unit The through hole 3〇5 of 34 is completely closed, and the outer diameter of the design of the electrostrictive drought element 34 can be appropriately increased. In addition, the outer diameter of the electrostrictive unit 34 can be made according to the specific first electrostrictive polymer layer 34, flexible The material and thickness of the electrode layer 342 and the second electrostrictive polymer layer 342 are selected. And the size of the light-passing hole 302 is designed, so that the electrostrictive unit 34 can effectively control the opening and closing of the pass-through 305, thereby controlling the amount of light passing through the light-passing hole 302. Please refer to FIG. 6-7, the second technical solution. The camera module provided by the embodiment is substantially the same as the camera module 100 provided by the first embodiment, except that the frame 232 of the shutter device 230 is formed by using a light transmissive material. The light transmissive frame 232 is formed to form a frame 232. The electrostrictive unit 234 can be sealed inside. Since the calender frame 232 has better light transmission performance, the light transmissive frame 2 3 2 does not need to open the light transmission hole so that the frame 2 3 2 can be better Protecting the electrostrictive unit 234 'in the interior thereof' to make the electric extension 098125129 Form No. A0101 Page 9 / 21 pages 0982043006-0 201104350 [0019] [0020] 098125129 The unit 234 is protected from external pollution and better guaranteed The stretching and contracting performance of the electrostrictive unit 234. The transparent frame 232 can be directly used as a transparent plate of the image sensor to protect the image sensor. In this embodiment, the electrostrictive unit 234 is perpendicular to the image sensor. The surface of the head module in the optical axis direction is circular. In addition, the electrostrictive unit 34 of the camera module 100 may have other shapes in a cross section perpendicular to the optical axis of the lens module 1, for example, may be a rectangle. a shape such as a triangle, a polygon, or the like, as long as the through hole 305 of the electrostrictive unit is circular. Compared with the prior art, the shutter device 3 of the present invention includes a frame 32 and The electrostrictive unit 34 is housed in the frame 32, and the electrostrictive unit 34 includes a first electrostrictive polymer layer 341, two flexible electrode layers 342 and two second electrostrictive polymer layers 343. A through hole 305 ′ is formed in the center of the telescopic unit 34 to control the size of the through hole 3〇5 by the voltage applied to the two flexible electrode layers 342. The structure is simple, no noise, and the response speed is relatively roasting; Moreover, two flexible electrode layers 342 are disposed on opposite surfaces 3411, 3412 of the first electrostrictive polymer layer 341, and two flexible ingot layers 3: 42 are provided on both sides of the first electrostrictive polymerization. The second layer of thin layer 341 The two stretched polymer layers 343 can effectively isolate the two flexible electrode layers 342 from contact with the outside, and prevent the two flexible electrode layers 342 from being oxidized by the humid air outside to affect the conductive The performance, and the thinner second electrostrictive polymer layer 343 has little effect on the response speed of the shutter device 3G, thereby improving the stability and accuracy of the life and response of the shutter device 3Q. In summary, the present invention has indeed met the requirements of the invention patent, and is based on the law. Page 10 of 21 Form No. A0101 0982043006-0 [0021] 201104350 Patent application. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0029] FIG. 1 is a schematic diagram of a camera module provided by a first embodiment of the present technical solution. [0029] FIG. 2 is a schematic view showing the shutter of the camera module of FIG. 1 when the shutter is opened. FIG. 3 is a schematic diagram of the electrostrictive unit of the shutter device of FIG. 4 is a schematic view showing the shutter of the camera module of FIG. 1 when the shutter is closed. FIG. 5 is a schematic view of the electrostrictive unit of the shutter device of FIG. FIG. 6 is a schematic diagram of a shutter device of a camera module according to a second embodiment of the present technical solution. Figure 7 is a schematic illustration of the electrostrictive unit of the shutter device of Figure 6. [Main component symbol description] 'Camera module 100 Lens module 10 Image sensor 20 Shutter device 30, 230 Mirror base 11 tit. Mirror 阂 12 Lens group 13 Form number A0101 Page 11 of 21 0982043006-0 098125129 201104350 First receiving hole 111 Second receiving hole 112 Receiving hole 121 Transparent plate 21 Frame 32 ' 232 Electrostrictive unit 34 > 234 Upper frame 321 Lower frame 322 Top plate 323 Base plate 324 Light hole 302 Reception cavity 304 First electric Stretch polymer layer 1. Flexible electrode layer 342 Second electrostrictive polymer layer 343 First surface 3411 First '"" Surface 3412 Surface 3421 Through hole 305 098125129 Form No. A0101 Page 12 of 21 0982043006-0