1335996 ， % * 099年08月16日隹正替換頁 六 [0001] [0002] [0003] [0004] 096143498 發明說明： 【發明所屬之技術領域】 ， 本發明涉及成像技術，特別涉及二種廣角鏡頭及成像裝 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 像侧之影像感測器’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，有必要提供一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。 一種廣角鏡頭，其包括鏡筒及收容於該鏡筒内之成像透 1 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。該合光棱鏡包括四個相互接合之偏振分光棱鏡 、三個裸露於該鏡筒外且分屬於三個偏振分光棱鏡之入 射面及與該成像透鏡組相對且屬於另一個偏振分光棱鏡 之出射面’該二個入射面鍍有不同之單色濾光膜以分別 濾取不同波長之單色光。 一種成像裝置’其包括廣角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 表單編號A0101 第4頁/共14頁 0993291884-0 [0005] 1335996 . 099年08月16日修正替換頁 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。該合光棱鏡包括四個相互接合之偏 振分光棱鏡、三個裸露於該鏡筒外且分屬於三個偏振分 光棱鏡之入射面及與該成像透鏡組相對且屬於另一個偏 振分光棱鏡之出射面，該三個入射面鍍有不同之單色濾 光獏以分別濾取不同波長之單色光。 [0006] • 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。 / [0007] 【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。 [0008] 請參閱圖1，第一實施方式之成像裝置100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及設置 於成像鏡片組12物側之合光棱鏡13(X-cube)。合光棱鏡 13包括三個裸露於鏡筒11外之入射面13r，13g，13b及 與成像透鏡組12相對之出射面13w，三個入射面13r， 13g，13b分別鍍有紅（R)、綠（G)、藍（B)色濾光膜I4r， 14g, 14b以分別濾取紅、綠、藍三種單色光。 [0009] 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 096143498 筒11採用塑膠空心圓筒，其物側端形成有合光棱鏡收容 表單編號A0101 第5頁/共14頁 0993291884-0 1335996 099年08月16日修正替換頁 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固設於合未棱鏡收容部111將密封鏡筒 11，以阻隔外界光線進入成像光路影響成像》 [0010] 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 轴設置之塑膠球面鏡、塑勝非球面鏡、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，以保證廣角鏡頭之成像品質，控制廣 | 角鏡頭10之成本及尺寸。 [0011] 合光棱鏡13包括相立接合之四個偏振分光棱鏡 (polarization beam splitter)。由.於三個入射面 13r，13g，13b分別鑛有紅、綠、藍濾光膜14r，14g， 14b，所以：入射面之入射光只有紅色光（紅色s偏振 光）由出射面I3w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11 ;入射面 13b之入射光只有藍色光（藍色s偏振光）由出射面13评進 入鏡筒11 °即，合光棱鏡13之三個入射面13r，13g， 13b分別用於收集紅、綠、藍二種單色光。 [0012] 影像感測器20邛採用電荷耦合型（charge coupled device，CCD)感測器或補充性金屬半導體 (complementary metal oxide semiconductor, CMOS)感測器。請〆併參閱圖2 ’ CCD感測器及⑶⑽感測 器一般包括三個分別用於感測紅、綠、藍三種單色光之 096143498 像素陣列，每個像素陣列分別用於產生圖像之一個原色 表單編號A0101 第6頁/共14頁 0993291884-0 1335996 , , _ 099年08月16日核正替换頁 分量（primary color component) 〇 可以理解，本實 施方式中，三個像素陣列產生之三個原色分量分別對應 入射面13r，13g.，13b之入射光經成像鏡片組12後所成 之原色像》 [0013] 具體地，本實施方式之影像感測器2 0採用CCD感測器，並 設置於成像鏡片組12之像平面處。 [0014] 相較於先前之成像鏡頭’本發明之廣角鏡頭1〇可收集三 個視場（對應合光棱鏡13之三個入射面13r，13g，13b)1335996 , % * August 16th, 2008, 替换正正页页 [0001] [0002] [0003] [0004] 096143498 Description of the Invention: [Technical Field] The present invention relates to imaging technology, and in particular to two wide-angle lenses And an imaging device. [Prior Art] An electronic medical endoscope usually includes an imaging lens and an image sensor disposed on the image 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, medical endoscopes are generally required to have wide-angle imaging characteristics, that is, the imaging mirrors are required to have wide-angle characteristics. For this reason, the industry has attempted to increase the angle 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 includes a lens barrel and an imaging lens set 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 light combining prism comprises four mutually polarized beam splitting prisms, three incident surfaces exposed outside the lens barrel and belonging to three polarization beam splitting prisms, and an exit surface opposite to the imaging lens group and belonging to another polarization beam splitting prism. The two incident faces are plated with different monochromatic filter films to filter monochromatic light of different wavelengths, respectively. An imaging apparatus' 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 is housed in the lens barrel. Form No. A0101 Page 4 of 14 0993291884-0 [0005] 1335996. The imaging lens group in the replacement page is corrected on August 16, 099. The wide-angle lens further includes a light combining prism disposed on the side of the imaging lens assembly. The light combining prism comprises four mutually polarized beam splitting prisms, three incident surfaces exposed outside the lens barrel and belonging to three polarization beam splitting prisms, and an exit surface opposite to the imaging lens group and belonging to another polarization beam splitting prism. The three incident surfaces are plated with different monochromatic filters to filter monochromatic light of different wavelengths. [0006] Compared to the prior imaging lens, the wide-angle lens of the present invention collects incident light of three fields of view (corresponding to 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 ingest (collect light and generate corresponding images) three scenes of the scene, and has 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 imaging device 100 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 » Wide-angle lens • 10 includes a lens barrel 11 and an imaging lens housed in the lens barrel 11 The group 12 and the light combining prism 13 (X-cube) disposed on the object side of the imaging lens group 12. The light combining prism 13 includes three incident surfaces 13r, 13g, 13b exposed outside the lens barrel 11 and an exit surface 13w opposite to the imaging lens group 12. The three incident surfaces 13r, 13g, 13b are respectively plated with red (R), Green (G), blue (B) color filter films I4r, 14g, 14b 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 blocking the 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 096143498 of the present embodiment adopts a plastic hollow cylinder, and the object side end thereof is formed with a light-collecting prism accommodating form number A0101. Page 5 / 14 pages 0993291884-0 1335996 Correction replacement page of August 18, 2008 In the portion 111, the light combining prism accommodating portion 111 is fitted in the shape of the light combining prism 13. In this way, the light-collecting prism 13 is fixed to the un-prism accommodating portion 111 to seal the lens barrel 11 to block external light from entering the imaging light path to affect imaging. [0010] The imaging lens group 12 is used for optical imaging (the light-emitting prism 13 is emitted) The outgoing light of the surface 13w is imaged by the image sensor 20), and one or more coaxial spherical plastic mirrors, plastic aspherical mirrors, glass spherical mirrors or glass aspherical mirrors can be used, as required (for example, the imaging quality of the wide-angle lens 10) The cost of the lens unit 12 of the present embodiment is a four-piece spherical glass mirror to ensure the imaging quality of the wide-angle lens and control the cost and size of the wide-angle lens 10. [0011] The light combining prism 13 includes four polarization beam splitters that are joined together. The red, green and blue filter films 14r, 14g, 14b are respectively deposited on the three incident surfaces 13r, 13g, 13b, so that only the incident light of the incident surface is red light (red s-polarized light) enters the exit surface I3w. The lens barrel 11; the incident light of the incident surface 13g is only green light (green s-polarized light) enters the lens barrel 11 from the exit surface 13w; the incident light of the incident surface 13b is only blue light (blue s-polarized light) is entered by the exit surface 13 The lens barrel 11 °, that is, the three incident surfaces 13r, 13g, 13b of the light combining prism 13 are used to collect two kinds of monochromatic lights of red, green and blue, respectively. [0012] The image sensor 20A uses a charge coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor. Please refer to FIG. 2 ' CCD sensor and (3) (10) sensor generally includes three 096143498 pixel arrays for sensing three kinds of monochromatic light of red, green and blue, respectively, and each pixel array is used to generate images respectively. A primary color form number A0101 page 6 / 14 pages 0993291884-0 1335996 , , _ August 18, 2017, the primary color component is 核 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 The three primary color components respectively correspond to the primary color image formed by the incident light of the incident surface 13r, 13g., 13b through the imaging lens group 12. [0013] Specifically, the image sensor 20 of the present embodiment adopts a CCD sensor. And disposed at the image plane of the imaging lens group 12. [0014] Compared to the prior imaging lens, the wide-angle lens 1 of the present invention can collect three fields of view (corresponding to three incident faces 13r, 13g, 13b of the light combining prism 13).
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（收集光線生成對應之像）三個視場 之場景，具有廣角成像特性。彳 [0015] 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。 [0016] 請一併參閱圖4 ’色輪1 5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15 2部分（約一段）欲入鏡 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12Γ如入射面I3r, 13g， 13b之紅、綠、藍單色光按序經過成像鏡片組12)成像於 影像感測器20。如此設置，當成像裝置200應用於醫用内 096143498 表單煸號A0101 第7頁/共14頁 0993291884-0 1335996 099年08月16日菝正替換頁 視鏡或其他動態攝像裝置（video camera)進行動態拍攝 時，影像感測器20將輪流攝，三個視場之場景（在三個視 場間切換顯示），具有廣角成像特性。 [0017] 綜上所述，本發明確已符合發明專利要件，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方式 ，舉凡熟悉本案技藝之人士，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The incident light has a wide-angle characteristic (close to 270.). The imaging apparatus 100 of the present invention can simultaneously ingest (collect a corresponding image of light generation) 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 film disposed between the imaging lens group 12 and the light combining prism 13. Color wheel 15. [0016] Please refer to FIG. 4 together with the color wheel 15 including an annular filter element 152 composed of three red, green and blue filters and a motor for driving the rotation of the annular filter element 152. The annular filter 'optical sheet element 15 2 portion (about one segment) is intended to enter the lens barrel 11 and is 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 surface 13r, 13g, 13b is allowed to pass through the imaging lens group 12, such as the incident surface I3r, 13g, 13b, the red, green, and blue monochromatic light sequentially passes through the imaging lens group 12) to image the image sensing. 20. So, when the imaging device 200 is applied to the medical 096143498, the form number A0101, page 7 / 14 pages 0993291884-0 1335996, August 18, 2008, is being replaced by a video mirror or other video camera. During dynamic shooting, the image sensor 20 will take turns, three scenes of the scene (switched between three fields of view), with wide-angle imaging characteristics. [0017] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.
【圖式簡單說明】 [0018] 圖1為本發明第一實施方式之成像裝置之結構示意圖。 [0019] 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。 [0020] 圖3為本發明第二實施方式之成像裝置之結構示意圖。 [0021] 圖4為本發明第二實施方式所採用之色輪之平面示意圖。 【主要元件符號說明】 [0022] 成像裝置：100，200 [0023] 濾光膜：14r, 14g，14b [0024] 廣角鏡頭：10 [0025] 合光棱鏡收容部：111 [0026] 鏡筒：11 [0027] 影像感測器：20 [0028] 成像鏡片組：12 0993291884-0 096143498 表單编號A0101 第8頁/共14頁 099年08月16日按正替换頁 1335996 ..BRIEF DESCRIPTION OF THE DRAWINGS [0018] FIG. 1 is a schematic structural view of an image forming apparatus according to a first embodiment of the present invention. 2 is a schematic view showing the structure of an image sensor used in the first embodiment of the present invention. 3 is a schematic structural view of an image forming apparatus according to a second embodiment of the present invention. 4 is a schematic plan view of a color wheel used in a second embodiment of the present invention. [Main component symbol description] [0022] Imaging device: 100, 200 [0023] Filter film: 14r, 14g, 14b [0024] Wide-angle lens: 10 [0025] Light-collecting prism housing: 111 [0026] Tube: 11 [0027] Image Sensor: 20 [0028] Imaging Lens Group: 12 0993291884-0 096143498 Form No. A0101 Page 8 / Total 14 Pages 099 August 16 Press Positive Replacement Page 1335996 ..
[0029] 色輪：15 [0030] 合光棱鏡：13 .[0029] Color wheel: 15 [0030] Light combining prism: 13 .
[0031] 馬達：151 [0032] 入射面：13r，13g，13b [0033] 環狀濾光片元件：152 [0034] 出射面：13w[0031] Motor: 151 [0032] Incident plane: 13r, 13g, 13b [0033] Annular filter element: 152 [0034] Exit surface: 13w
096143498 表單編號A0101 第9頁/共14頁 0993291884-0096143498 Form No. A0101 Page 9 of 14 0993291884-0