200923414 九、發明說明： . 【發明所屬之技術領域】 ， 树明涉及成像技術’制纽-種廣肖鏡頭及成像 裝置。 • 【先前技術】 電子式醫用内視鏡通常包括成像鏡頭及設置於成像鏡 頭像側之影像感測器’成像鏡頭包括鏡筒及收容於鏡筒内 , 之成像鏡片組。為了方便腔内檢查或者腔内手術操作，一 般要求醫用内視鏡具有廣角成像特性，即要求成像鏡頭具 有廣角特性。為此’業界企圖通過設計成像鏡片組中各個 鏡片之光焦度及各個鏡片之間距來提高成像鏡頭之視場 角，然而，由此獲得之成像鏡頭之視場角並不理想。 【發明内容】 有鑒於此’有必要提供—種具有理想視場角之廣角鏡 頭及採用該廣角鏡頭之成像裝置。 一種廣角鏡碩，其包括鏡筒及收容於該鏡筒内之成像 透鏡組。該廣角鏡頭還包括設置於該成像透鏡組物側之合 光棱鏡。該合級鏡包括三個減於該鏡筒外之入射面及 與該成像透鏡組相對之出射面，該三個入射面鍵有不同之 單色濾光膜以分別濾取不同波長之單色光。 種成像裝置，其包括廣肖鏡頭及設置於該廣角鏡頭 像側之影像感測器。該廣角鏡頭包括鏡筒及收容於該鏡筒 内之成像透鏡組。該廣角鏡頭還包括設置於該成像透鏡組 ⑯側之合紐鏡。該合光棱鏡包括三個裸露於該鏡筒外之 200923414 入射面及，成像透鏡_對之出射面，該三個入射面锻 有不同之單色濾光膜以分別濾取不同波長之單色光。 、相較於先前之成像鏡頭，本發明之廣角鏡頭可收集三 個，場(對應合光棱鏡之三個入射面)之入射光，具有理想之 視場角（接近270。）。採用該廣角鏡頭之成像裝置可同時攝 取(收集I線並生成對應之圖像)三個視場之場景，具有廣角 成像特性。 ^ 【實施方式】 本發明之廣角鏡頭及成像裝置可應用於醫用内視鏡 中。 請參閱圖1，第一實施方式之成像裝置1〇〇包括廣角 鏡頭10及設置於廣角鏡頭10像側之影像感測器20。廣角 鏡頭10包括鏡筒11、收容於鏡筒11内之成像鏡片組12 及》又置於成像鏡片組12物側之合光棱鏡i3(X-cube)。合光 棱鏡13包括三個裸露於鏡筒1;1外之入射面13r, 13g，i3b 及與成像透鏡組12相對之出射面I3w，三個入射面13r，13g, !3b分別鍍有紅(R)、綠(G)、藍⑼色濾光膜14r，14g，Mb 以分別濾取紅、綠、藍三種單色光。 鏡筒11用於固持成像鏡片組12及合光棱鏡13，並阻 隔外界光線進入成像光路(合光棱鏡13之出射面13w與影 像感測器20之間之光路)影響成像。具體地，本實施方式 之鏡筒11採用塑膠空心圓筒，其物侧端形成有合光棱鏡收 容部111，合光棱鏡收容部111與合光棱鏡13形狀相配合。 如此’合光棱鏡13固設於合光棱鏡收容部111將密封鏡筒 200923414 11 ’以阻隔外界統進人成像光路f彡響成像。 成像鏡片組12用於光學成像(將合光棱鏡13之出射面 13W之出射光成像於影像感測器20)，其可採用一片或多片 同轴设置之塑膠球面鏡、塑膠非球面鏡、玻璃球面鏡或玻 璃非球面鏡’視需求(如對廣角鏡頭10之成像品質、成本 或尺寸之要求)而定。本實施方式之成像鏡片組12採用四 片球面玻璃鏡’以保證廣角鏡頭1〇之成像品質，控制廣角 鏡頭10之成本及尺寸。 合光棱鏡13包括相互接合之四個偏振分光棱鏡 (polarization beam splitter)。由於三個入射面 i3r，13g，13b 分別錢有紅、綠、藍濾光膜14γ，14g，14b，所以：入射面 13r之入射光只有紅色光(紅色s偏振光)由出射面13w進入 鏡筒11 ;入射面13g之入射光只有綠色光(綠色s偏振光) 由出射面13w進入鏡筒n ;入射面13b之入射光只有藍色 光(藍色s偏振光)由出射面i3w進入鏡筒η。即，合光棱 鏡13之三個入射面13r，13g，13b分別用於收集紅、綠、藍 三種單色光。 影像感測益20可採用電荷耗合型（charge C0Upied device, CCD)感測器或補充性金屬半導體(c〇mplernentary metal oxide semiconductor，CMOS)感測器。請一併參閱圖 2，CCD感測器及CMOS感測器一般包括三個分別用於感 測紅、綠、藍三種單色光之像素陣列，每個像素陣列分別 用於產生圖像之一個原色分罝(primary color component)_。 可以理解，本實施方式中，三個像素陣列產生之三個原色 200923414 分量分別對應入射面13r，13g，13b之入射光經成像鏡片組 12後所成之原色像。 具體地，本實施方式之影像感測器20採用CCD感測 器，並設置於成像鏡片組12之像平面處。 相較於先前之成像鏡頭，本發明.之廣角鏡頭可收集 三個視場(對應合光棱鏡13之三個入射面13r，13g，13b)之 入射光，具有廣角特性(接近270°)。本發明之成像裝置100 可同時攝取（收集光線並生成對應之圖像)三個視場之場 景，具有廣角成像特性。 請參閱圖3，第二實施方式之成像裝置200與第一實 施方式之成像裝置100之區別包括：成像裝置200還包括 一個設置於成像透鏡組12與合光棱鏡13之間之色輪15。 請一併參閱圖4，色輪15包括紅、綠、藍三段濾光片 組成之環狀濾光片元件152及用於驅動環狀濾、光片元件 152轉動之馬達151。環狀濾、光片元件；JL52部分(約一段)喪 入鏡筒11，並插入成像光路中。如此，當馬達151轉動時， 環狀濾光片元件152之紅、綠、藍三段濾光片輪流插入成 像光路，分離合光棱鏡13之出射面13w之出射光以產生 紅，綠，藍時序色光。即，時序地允許入射面13r，13g，13b 之入射光經過成像鏡片組12(如入射面i3r，13g 13b之紅、 綠、藍單色光按序經過成像鏡片組u)成像於影像感測器 20。如此設置，當成像裝置翻於f _視鏡或其他 動態攝像裝置(video _era)進行動態拍攝時 20將輪流齡三減場之蘇(在三她場_換顯示 200923414 具有廣角成像特性。 、.’T、上所述，本發明確已符合發明專利要件，爰依法提 出專利中請。惟’以上所述者僅為本發明之較佳實施方式， 舉凡热悉本案技藝之人士，於援依本案發明精神所作之等 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】 圖1為本發明第一實施方式之成像裝置之結構示意圖。 圖2為本發明第一實施方式所採用之影像感測器之結構示 意圖。 圖3為本發明第二實施方式之成像裝置之結構示意圖。 圖4為本發明第二實施方式所採用之色輪之平面示意圖。 【主要組件符號說明】 成像裝置 100, 200 濾光膜 14r, 14g, 14b 廣角鏡頭 10 合光棱鏡收容部 111 鏡筒 11 影像感測器 20 成像鏡片組 12 色輪 15 合光棱鏡 13 馬達 151 入射面 13r, 13g, 13b 環狀濾光片元件 152 出射面 13w 10200923414 IX. Inventive description: . [Technical field to which the invention pertains], Shuming relates to imaging technology, and the lens and imaging device. • [Prior Art] An electronic medical endoscope usually includes an imaging lens and an image sensor disposed on the avatar side of the imaging lens. The imaging lens includes a lens barrel and an imaging lens group housed in the lens barrel. In order to facilitate intraluminal examination or intraluminal surgical operation, it is generally required that the medical endoscope has wide-angle imaging characteristics, that is, the imaging lens is required to have wide-angle characteristics. To this end, the industry has attempted to increase the field of view of the imaging lens by designing the power of each lens in the imaging lens group and the distance between the lenses. However, the angle of view of the imaging lens thus obtained is not ideal. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a wide-angle lens having an ideal angle of view and an imaging apparatus using the wide-angle lens. A wide-angle lens comprising a lens barrel and an imaging lens group housed in the lens barrel. The wide-angle lens further includes a light combining prism disposed on the side of the imaging lens group. The grading mirror comprises three incident surfaces which are subtracted from the outside of the lens barrel and an exit surface opposite to the imaging lens group. The three incident surface keys have different monochromatic filter films for respectively filtering the monochromatic colors of different wavelengths. Light. An imaging device includes a wide-angle lens and an image sensor disposed on the image side of the wide-angle lens. The wide-angle lens includes a lens barrel and an imaging lens group housed in the lens barrel. The wide-angle lens further includes a compositing mirror disposed on the side of the imaging lens group 16. The light combining prism comprises three entrance faces of 200923414 exposed outside the lens barrel and an exiting surface of the imaging lens _ opposite, and the three incident surfaces are forged with different monochromatic filter films to respectively filter the monochromatic colors of different wavelengths. Light. Compared with the prior imaging lens, the wide-angle lens of the present invention can collect three incident light of the field (corresponding to the three incident faces of the light combining prism) with an ideal angle of view (close to 270.). The wide-angle lens imaging device can simultaneously capture (collect the I line and generate the corresponding image) three scenes of the scene with wide-angle imaging characteristics. [Embodiment] The wide-angle lens and imaging device of the present invention can be applied to a medical endoscope. Referring to FIG. 1, the image forming apparatus 1 of the first embodiment includes a wide-angle lens 10 and an image sensor 20 disposed on the image side of the wide-angle lens 10. The wide-angle lens 10 includes a lens barrel 11, an imaging lens group 12 housed in the lens barrel 11, and a light-collecting prism i3 (X-cube) placed on the object side of the imaging lens group 12. The light combining prism 13 includes three incident surfaces 13r, 13g, i3b exposed outside the lens barrel 1; 1 and an exit surface I3w opposite to the imaging lens group 12, and the three incident surfaces 13r, 13g, !3b are respectively plated with red ( R), green (G), blue (9) color filter film 14r, 14g, Mb to filter three kinds of monochromatic light of red, green and blue, respectively. The lens barrel 11 is for holding the imaging lens group 12 and the light combining prism 13, and blocks external light from entering the imaging light path (the optical path between the exit surface 13w of the light combining prism 13 and the image sensor 20) to affect imaging. Specifically, the lens barrel 11 of the present embodiment is a hollow plastic cylinder having a light-collecting prism receiving portion 111 formed on the object side end thereof, and the light combining prism housing portion 111 is fitted in the shape of the light combining prism 13. Thus, the light-combining prism 13 is fixed to the light-collecting prism accommodating portion 111, and the sealed lens barrel 200923414 11 ' is blocked from being imaged by the external image forming optical path f. The imaging lens group 12 is used for optical imaging (image of the exit surface 13W of the light combining prism 13 is imaged to the image sensor 20), and one or more coaxial spherical plastic mirrors, plastic aspherical mirrors, and glass spherical mirrors may be used. Or a glass aspherical mirror 'depending on the requirements (such as the imaging quality, cost or size requirements of the wide-angle lens 10). The imaging lens group 12 of the present embodiment employs four spherical glass mirrors to ensure the imaging quality of the wide-angle lens and control the cost and size of the wide-angle lens 10. The light combining prism 13 includes four polarization beam splitters that are joined to each other. Since the three incident surfaces i3r, 13g, and 13b respectively have red, green, and blue filter films 14γ, 14g, and 14b, the incident light of the incident surface 13r is only red light (red s-polarized light) enters the mirror from the exit surface 13w. The incident light of the incident surface 13g is only green light (green s-polarized light) enters the lens barrel n from the exit surface 13w; the incident light of the incident surface 13b is only blue light (blue s-polarized light) enters the lens barrel from the exit surface i3w η. That is, the three incident faces 13r, 13g, 13b of the light combining prism 13 are used to collect three kinds of monochromatic lights of red, green and blue, respectively. The image sensing benefit 20 may be a charge C0Upied device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor. Referring to FIG. 2 together, the CCD sensor and the CMOS sensor generally include three pixel arrays for sensing three kinds of monochromatic lights of red, green and blue, respectively, and each pixel array is used to generate one of the images respectively. Primary color component_. It can be understood that, in the present embodiment, the three primary colors 200923414 generated by the three pixel arrays respectively correspond to the primary color images formed by the incident light of the incident surface 13r, 13g, 13b through the imaging lens group 12. Specifically, the image sensor 20 of the present embodiment employs a CCD sensor and is disposed at an image plane of the imaging lens group 12. Compared with the prior imaging lens, the wide-angle lens of the present invention can collect incident light of three fields of view (corresponding to the three incident faces 13r, 13g, 13b of the light combining prism 13), and has wide-angle characteristics (close to 270°). The imaging apparatus 100 of the present invention can simultaneously ingest (collect light and generate corresponding images) scenes of three fields of view with wide-angle imaging characteristics. Referring to FIG. 3, the difference between the imaging device 200 of the second embodiment and the imaging device 100 of the first embodiment includes that the imaging device 200 further includes a color wheel 15 disposed between the imaging lens group 12 and the light combining prism 13. Referring to FIG. 4 together, the color wheel 15 includes an annular filter element 152 composed of three segments of red, green and blue filters and a motor 151 for driving the ring filter and the rotation of the film element 152. Annular filter, optical element; JL52 part (about one segment) is dropped into the lens barrel 11 and inserted into the imaging optical path. Thus, when the motor 151 rotates, the red, green, and blue three-stage filters of the annular filter element 152 are alternately inserted into the imaging optical path, and the outgoing light of the exit surface 13w of the light combining prism 13 is separated to generate red, green, and blue. Timing color light. That is, the incident light of the incident surfaces 13r, 13g, 13b is allowed to be sequentially imaged through the imaging lens group 12 (for example, the red, green, and blue monochromatic light of the incident surface i3r, 13g 13b sequentially passes through the imaging lens group u) for image sensing. 20. In this way, when the imaging device is turned over to the f-view mirror or other dynamic camera device (video _era) for dynamic shooting, 20 will reduce the age of the three-stage field (in the three-field _ change display 200923414 with wide-angle imaging characteristics. 'T, above, the present invention has indeed met the requirements of the invention patent, and the patent is filed according to law. However, the above is only the preferred embodiment of the present invention, and those who are familiar with the skill of the case, Yu Yiyi BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of an image forming apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic view of the present invention. 3 is a schematic structural view of an image sensor according to a second embodiment of the present invention. Fig. 4 is a plan view showing a color wheel used in a second embodiment of the present invention. Component symbol description] Imaging device 100, 200 filter film 14r, 14g, 14b Wide-angle lens 10 Light-collecting prism housing 111 Tube 11 Image sensor 20 Imaging lens group 12 Color 15 light combiner prism 13 incident surface 151 motor 13r, 13g, 13b annular filter element 152 exit surface 13w 10