M307135 八、新型說明： 【新型所屬之技術領域】 本創作係有關-種光學系統，尤指—種用於攝影裝置之紅外線截止 光學系統。 【先前技術】 按，人類視覺具有可感知400〜奈米（nm)可見光，但對波長 • 超過700奈米（腿）之紅外線卻無法感知的特性，* CCD (Ch零 C〇U_Device ’電荷耦合元件）等影像感測器則具有不僅對可見光， 而且對波長直到l_nm之紅外線也具有良好感光度的敏感特性，所感 光的紅外線會導致圖像清晰度降低或圖像劣化。故，為使紅外線不入 射到CCD等影像感測器，有必要在影像感測器的入射側配置一紅外線 截止裝置。該紅外線截止裝置可為—光學低猶波器（〇LpF，M307135 VIII. New description: [New technical field] This creation is related to an optical system, especially an infrared cut-off optical system used in photographic equipment. [Prior Art] According to human vision, it has a characteristic that can sense 400 ~ nanometer (nm) visible light, but does not perceive the infrared wavelength of more than 700 nm (leg), * CCD (Ch zero C〇U_Device 'charge coupling Image sensors, etc., have sensitive characteristics not only for visible light but also for good sensitivity to infrared rays having wavelengths up to l_nm, and the sensitized infrared rays may cause image sharpness reduction or image degradation. Therefore, in order to prevent infrared rays from entering the image sensor such as a CCD, it is necessary to arrange an infrared cutoff device on the incident side of the image sensor. The infrared cut-off device can be an optical low-resolution device (〇LpF,
LowPass Filter)或-以平板玻璃為基質之紅外截止遽光片（砂，虹说 • Fllter)。該等紅外線截止裝置具有可使可見光透過而阻擋紅外線透過之 特性，故可關紅外·人CCD成像面而造細财清晰的問題，並 減輕由紅精成的餘色調，核職CCD的彩色顧性能，而 可得到與人類視覺特性相近之彩色圖像。 光學低通渡波器OLPF是由高品質的光學石英水晶片、增透膜、紅 外截止渡光片（如吸收式魏玻璃）等精練合而成。在鏡頭元件和 CCD影像感·之間加設〇LpF，可防止CCD影佩廳由於畫素間 隔而產生的偽色與波紋，改善紅外線對^^成像的影響，使影像更清 5 M307135 晰穩定。LowPass Filter) or - Infrared cut-off calender based on flat glass (sand, rainbow said • Fllter). The infrared cut-off device has the characteristics of transmitting visible light and blocking the transmission of infrared rays, so that the infrared and human CCD imaging surface can be closed to create a clear and fine problem, and the residual color formed by red is reduced, and the color of the nuclear CCD is considered. Performance, and a color image similar to human visual characteristics can be obtained. The optical low-pass waver OLPF is a combination of high-quality optical quartz wafers, anti-reflection coatings, and infrared cut-off light-emitting sheets (such as absorption Wei glass). 〇LpF is added between the lens element and the CCD image sense to prevent the false color and ripple generated by the CCD shadow hall due to the pixel interval, improve the influence of infrared rays on the imaging, and make the image clearer. 5 M307135 .
然而，近年來，隨著CCD技術的快速發展、CCD晝素數不斷提昇。 CCD晝素數目越多，單一感測器尺寸越大，收集到的圖像就越清晰。 因此，光學低通濾波器OLPF已漸不需要，但為避免紅外線進入CCD 成像面，仍需在CCD前增設一以平板玻璃為基質之紅外截止濾光片 ICF。 紅外截止渡光片包括吸收型和反射型。其中，吸收型紅外截止漁光 片係在玻片中含有吸收紅外線的金屬離子。此種吸收型紅外截止濾光 片具有從波長550nm到750nm之間透過率逐漸下降的特性。雖然通過 該透過率特性能再現接近人類視覺敏感特性之自然顏色，然為獲得良 好的透過轉性，需把玻片的厚度加王到既定厚度以上，從而使攝影 裝置小型化之需求難以實現。 反射型紅外截止濾光片則係在玻片上形成有反射紅外線的光學多 層媒。該等多層膜係由高折射率材質形成之薄膜和由低折射率材質形 成之薄膜交替層好層而形成。由於反射型紅外截止濾光片之厚度較 薄，故較易實現攝影裝置之小型化。 然而，由於該反射型紅外截止濾光片係設於CCD與鏡頭系統之 間’來自被攝物之入射光束以近似垂直狀態（入射角為〇度）入射後， 經由鏡頭純人射至紅外截止據光片時，光束已多呈發散狀態，光線 入射角變較大’故紅外線_鱗降低，反射紅外線之效果較差。另， 在攝μ置之光學系統中額外增設—反射型紅外截止濾、光片作為一光 6 M307135 子P件亦增力口 了系統之製造與組裝成本，而較不經濟。 、疋X由上可知，上述習知之紅外線截止裝置，在實際使用上，顯 然仍具有不便與缺失存在，而可待加以改善者。 【新型内容】 本創作之主要目的在於提供_種紅外線截止光料統，該光學系統 的個或多個透鏡面上係鍍有紅外線反射膜，鍍膜面之曲率中心係與 中心入射絲線期邊人射主絲之交驗於_，以實現最佳之紅 外線濾光效果。 本創作之另-目的在於提供—種紅外線截止光學系統，該光學系統 的一個或夠透鏡面上顧有紅外線反賴，可省略單歡置之紅外 線截止裝置，從而降低成本，提升競爭力。 依據本創作之目的而提供之紅外線截止光學系統包含複數個透 鏡，其中至少-個透鏡面上财紅外線反射膜嗜膜面之選擇原則為 該鑛膜面之醇中心和中心人射主光線及周邊人射主光線之交點在同 側，如此可使得CCD成像面上的偏紅色光線分佈平均，增強⑽之彩 色還原性能。優選鍍咖為該纽中滿足上述特定條件且光線入射角 最小之透鏡面。 與習知技術相比，在本創作光學系統中，藉由在一個或多個透鏡面 上直接鑛-紅外線反射膜，可省略習用的單獨設置之紅外線截止裝置 而節約成本。該鐘膜面之曲率中心係與中心入射主光線及周邊入射主 M307135 光線之交點位於同侧，可實現最佳之紅外線濾、光效果。 【實施方式】 請參考第-圖，係爲本創作紅外線截止光學系統之第一實施例。该 紅外線截止光學祕1G包含—鄰近物端設置之新月透鏡1與一鄰近像 端設置之雙凸透鏡2。該新月透鏡i具有第一表面u與第二表面η， 其中鄰近物端之第-表面11财—紅外線反細。該雙凸透鏡2具有 第-表面21與第二表® 22。新月透鏡i第一表面u的曲率中心位於 系統光軸上的ci點處。藉由在新月透鏡！第—表面u上錢一紅外線 反射膜’可使可見光透過而阻n外線之透過，故可限制紅外線進入 CCD成像面而造成圖像不清晰，並減輕由紅外線所造成的偏紅色調， 有效增強CCD的彩色還原性能，而可得到與人類視覺特性相近之彩色 圖像。 入射該光學系統10之中心入射主光線ai與周邊入射主光線bii、 bu在經由新月透鏡1與雙凸透鏡2折射後，交會於系統光軸上的di 點處。由第一圖可見，在本實施例中，該新月透鏡丨鍍有紅外線反射 膜之第一表面11的曲率中心C1係位於中心入射主光線ai與周邊入射 主光線bu、b12的交點D1同側，即鍍膜面η的右側。如此，可使系統 之紅外線濾光達到較佳效果。 為增強紅外線反射效果，亦可在雙凸透鏡2的第一表面21進一步 鍍製一紅外線反射膜。該第一表面21滿足其曲率中心與中心入射主光 M307135 線七及周邊入射主光線bii、匕2的交點Di位於同側的特定條件。該第 表面21的曲率中心係位於系統光軸上的點處，與交點位於雙 凸透鏡2第—表面21的右側。故，在第-實施例的光學系統1〇中， 除於新月透鏡1第—表面11上鑛紅外線反射膜之外，亦可進-步在雙 凸透鏡2 H面21 ±鍍製_紅外線反纏。韻賴面為凸透鏡 2之第-表面21，因巾心人射主光線力及周邊人射主光線^ ★入射 第表面21日寸相對幸父垂直，即，入射角相對較小，如此可較均一地 反射紅外線’而提升紅外線之截止效果。當然，設置多個紅外線反射 鍍膜面可使系統之紅外_光效果最佳化，但會相應增加—定之成本。 "本創作之紅外線反射膜可藉由高折射率材質形成的薄膜及低折射 率材質域的薄膜父替層疊多層而形成。形成該紅外線反射膜的高折 稗層的材貝有Tl〇2、也〇5、他〇5、加2等，低折射率層的材質則 有 Si〇2、A12〇3、MgF2 等。 為將n折射率層和崎射率層交魏麟舰上，通常湖物理成 膜法’亦可採料通的真空驗法，但優選採用可穩定控制膜的折射 ^ 光特倾時間變化小的朗離子加速紐或離子電鐘 *賤射4由於成膜層的折射料光學常數因成膜方法、成膜條件 *素而有所不同’故需在鑛製前正確測定成膜層的光學常數。 第二圖所示係爲本創作紅外線截止光學系統之第二實施例。該紅外 線截止光料統20包含—鄰近物驢置之雙凸透鏡3與-氣像端設 置之雙凹透鏡4。該雙凸透鏡3具有第一表面31和第二表面32。該雙 9 M307135 j、有第表面41和第二表面42。雙凸透鏡3位於系統最左側 ^第一表面^與雙凹透鏡4之第_表面41均鍍有—紅外線反射膜。 、、 第表面31之曲率中心為位於系統光軸上的C3點，雙凹 透、兄第表面41之曲率中心為位於系統光抽上的以點。由第二圖 "見曲率中心〇、C4與中心人射主光線a2及周邊人射主光線b21、 22的又』D2均位於同側。曲率中心C3與交點D2係位於雙凸透鏡3 第表面31之右側，而曲率中心a與交點μ則係位於雙凹透鏡4 第一表面41之左側。 第三圖所示係爲本創作紅外線截止光學系統之第三實施例。該紅外 線截止光學祕30包含4個透鏡，分別為—鄰近物端設置之新月透鏡 6凸透鏡7、一平凸透鏡8及一鄰近像端設置之平凸透鏡9。中心 入射主光線的及周邊入射主光線係交會於位於系統光軸上的點 D3 °該新月透鏡6鄰近物端之表面61鍍有一紅外線反射膜，其曲率中 心係位於系統光軸上之C6點，與光線交點D3共同位於表面&之左 側。該凸透鏡7位於像端之表面72鍍有一紅外線反射膜，其曲率中心 係位於系統光軸上之C7點，與光線交點D3共同位於表面72之左側。 該平凸透鏡8位於像端之表面82亦鍍有一紅外線反射膜，其曲率中心 係位於糸統光軸上之C8點’與光線交點D3亦共同位於表面&之左 側。在本實施例中，優選鍍膜面為凸透鏡8之表面82，因中心入射主 光線a3及周邊入射主光線、br入射該表面82時相對較垂直，即， 入射角相對較小。 M307135 本創作紅外顧止光學纽的主制奴構成触蝴、數位攝影 機内部的影像_1!(感光元件）之透鏡魏的全部或—部分。利用 X在透鏡表Φ上的紅外線反射膜，本創作可在人射罐物端)即對入射光 進订紅外線阻斷。阻斷了紅外線的人射光進人影像感·後，影像感 測器將其轉換輕信號，並制電子部件生成與人眼視髓性相吻合 之彩色圖像信號輸出。 如前所述，本創作之紅外、_止光學系統藉由在—個衫個透鏡面 上設置紅外線反細，使鱗透鏡除具有透鏡的基本功能之外，還進 一步具有阻斷紅外線之功能，故可省略習用之紅外線截止裝置，而可 實現低成本和小型化。 更為重要的是，本創作之紅外線截止光學系統藉由在一個或多個透 鏡面上設置紅外線反射膜，該等鍍膜面之選擇滿足其曲率中心和中心 入射主光線及周邊入射主光線之交點位於同側的特定條件，如此可取 知最佳之紅外線滤光效果’使得CCD成像面上的偏紅色光線分佈平均， 增強CCD之彩色還原性能。優選鐘膜面為中心及周邊入射主光線入射 時基本呈垂直狀態之透鏡表面，即，光線入射角相對較小之透鏡表面， 以較均一地反射紅外線，而提升紅外線之截止效果。 以上所揭示的，僅係本創作的較佳實施方式而已，不能以此來限定 本創作實施的範圍，本技術領域内的一般技術人員根據本創作所作的 均等變化，以及本領域内技術人員熟知的改進，都應仍屬於本專利所 涵蓋的範圍。 11 M307135 【圖式簡單說明】 第一圖係本創作紅外線截止光學系統之第一實施例。 第二圖係本創作紅外線截止光學系統之第二實施例。 第三圖係本創作紅外線截止光學系統之第三實施例。 【主要元件符號說明】 新月透鏡 1、6 雙凸透鏡 2、3 雙凹透鏡 4 凸透鏡 7However, in recent years, with the rapid development of CCD technology, the number of CCDs has been increasing. The greater the number of CCD elements, the larger the size of a single sensor and the clearer the image collected. Therefore, the optical low-pass filter OLPF has been gradually eliminated, but in order to prevent infrared rays from entering the CCD imaging surface, it is necessary to add an infrared cut filter ICF based on a flat glass in front of the CCD. Infrared cut-off light guides include both absorptive and reflective types. Among them, the absorption type infrared cut-off fishing film contains metal ions that absorb infrared rays in the slide. Such an absorption type infrared cut filter has a characteristic that the transmittance gradually decreases from a wavelength of 550 nm to 750 nm. Although the natural color close to human visually sensitive characteristics is reproduced by the transmittance characteristic, in order to obtain good transparency, it is necessary to increase the thickness of the slide to a predetermined thickness or more, so that the demand for miniaturization of the photographic apparatus is difficult to achieve. The reflective infrared cut filter is formed on the slide to form an optical multi-layer medium that reflects infrared rays. The multilayer film is formed by a film formed of a high refractive index material and a thin layer of a thin film formed of a low refractive index material. Since the thickness of the reflective infrared cut filter is thin, it is easy to achieve miniaturization of the photographing device. However, since the reflective infrared cut filter is disposed between the CCD and the lens system, the incident beam from the subject is incident in an approximately vertical state (incident angle is a twist), and is incident on the infrared through the lens. According to the light sheet, the light beam has been in a divergent state, and the incident angle of the light becomes larger. Therefore, the infrared ray scale is lowered, and the effect of reflecting infrared rays is poor. In addition, the addition of a reflective infrared cut filter and a light sheet as a light 6 M307135 sub-P piece also increases the manufacturing and assembly cost of the system, and is less economical. It can be seen from the above that the above-mentioned conventional infrared cut-off device obviously has inconvenience and absence in actual use, and can be improved. [New content] The main purpose of this creation is to provide an infrared cut-off light system. One or more lens surfaces of the optical system are coated with an infrared reflective film, and the center of curvature of the coated surface is centered on the center of the incident line. The test of the main wire is checked in _ to achieve the best infrared filter effect. Another object of the present invention is to provide an infrared cut-off optical system in which one of the optical systems has an infrared ray on the lens surface, and the infrared line cut-off device of the single-seat can be omitted, thereby reducing costs and improving competitiveness. The infrared cut-off optical system provided according to the purpose of the present invention comprises a plurality of lenses, wherein at least one of the lens faces of the infra-red reflective film is selected from the center of the alcohol film and the center of the main film and the periphery of the film. The intersection of the person's main rays is on the same side, so that the reddish light distribution on the CCD image plane is averaged, and the color reproduction performance of (10) is enhanced. Preferably, the plating is the lens surface of the button that satisfies the above specific conditions and has the smallest incident angle of light. Compared with the prior art, in the present optical system, by directly using a mine-infrared reflecting film on one or more lens faces, it is possible to omit the conventionally disposed infrared cut-off device and save costs. The center of curvature of the clock face is on the same side as the intersection of the central incident chief ray and the peripheral incident main M307135 ray, which can achieve the best infrared filtering and light effect. [Embodiment] Please refer to the first figure, which is a first embodiment of creating an infrared cut-off optical system. The infrared cut-off optical secret 1G includes a crescent lens 1 disposed adjacent to the object end and a lenticular lens 2 disposed adjacent to the image end. The crescent lens i has a first surface u and a second surface η, wherein the first surface 11 adjacent to the object end is inverted. The lenticular lens 2 has a first surface 21 and a second surface® 22. The center of curvature of the first surface u of the crescent lens i is located at the ci point on the optical axis of the system. With the lens in the crescent moon! On the first surface, the money-infrared reflective film can transmit visible light and block the transmission of the outer line. Therefore, infrared rays can be restricted from entering the CCD imaging surface, resulting in unclear images and reducing the reddishness caused by infrared rays. The color reproduction performance of the CCD can obtain a color image similar to human visual characteristics. The central incident chief ray ai and the peripheral incident chief ray bii, bu incident on the optical system 10 are refracted by the crescent lens 1 and the lenticular lens 2, and then intersect at a di point on the optical axis of the system. As can be seen from the first figure, in the present embodiment, the center of curvature C1 of the first surface 11 on which the crescent lens is plated with the infrared reflecting film is located at the intersection D1 of the central incident chief ray ai and the peripheral incident principal rays bu, b12. The side, that is, the right side of the coated surface η. In this way, the infrared filtering of the system can achieve better results. In order to enhance the infrared reflection effect, an infrared reflecting film may be further plated on the first surface 21 of the lenticular lens 2. The first surface 21 satisfies a specific condition in which the center of curvature is on the same side as the intersection point D of the central incident main light M307135 and the peripheral incident principal rays bii and 匕2. The center of curvature of the first surface 21 is located at a point on the optical axis of the system, and the intersection is located to the right of the first surface 21 of the lenticular lens 2. Therefore, in the optical system 1 of the first embodiment, in addition to the mineral infrared reflecting film on the first surface 11 of the crescent lens 1, the step of the lenticular lens 2 H surface 21 can be further advanced. Wrapped around. The rhyme surface is the first surface 21 of the convex lens 2, because the main light force of the person in the towel and the main light of the surrounding person ^ ★ the surface of the incident surface 21 is relatively perpendicular to the father, that is, the incident angle is relatively small, so Uniformly reflects infrared rays' and enhances the cut-off effect of infrared rays. Of course, setting multiple infrared reflective coating surfaces optimizes the infrared ray effect of the system, but it increases accordingly – the cost. " The infrared reflective film of the present invention can be formed by laminating a plurality of films formed of a high refractive index material and a film of a low refractive index material. The material of the high-fold layer of the infrared-reflective film is T1〇2, 〇5, 〇5, 2+, and the like, and the material of the low-refractive-index layer is Si〇2, A12〇3, MgF2, or the like. In order to transfer the n-refractive-index layer and the rugged-rate layer to the Weilin ship, the lake physical film-forming method can also be used for vacuum testing, but it is preferable to use a stable control film to refract the light. Long ion acceleration neon or ion electric clock * 贱 4 Because the optical constant of the refractive material of the film formation differs depending on the film formation method and film formation conditions, it is necessary to accurately determine the optical constant of the film formation before the mineral system. . The second figure shows a second embodiment of the creation of an infrared cut-off optical system. The infrared ray stop system 20 includes a lenticular lens 3 adjacent to the object and a biconcave lens 4 disposed at the gas image end. The lenticular lens 3 has a first surface 31 and a second surface 32. The double 9 M307135 j has a first surface 41 and a second surface 42. The lenticular lens 3 is located on the leftmost side of the system. The first surface ^ and the first surface 41 of the biconcave lens 4 are plated with an infrared reflecting film. The center of curvature of the first surface 31 is the point C3 on the optical axis of the system, and the center of curvature of the double concave surface and the surface 41 of the brother is a point on the light pumping of the system. From the second picture " see the center of curvature C, C4 and the central person's chief ray a2 and the neighboring person's main ray b21, 22 and then D2 are located on the same side. The center of curvature C3 and the intersection D2 are located on the right side of the first surface 31 of the lenticular lens 3, and the center of curvature a and the point of intersection μ are located on the left side of the first surface 41 of the biconcave lens 4. The third figure shows a third embodiment of the creation of an infrared cut-off optical system. The infrared line cut-off optical secret 30 comprises four lenses, namely a crescent lens 6 disposed adjacent to the object end, a convex lens 7, a plano-convex lens 8, and a plano-convex lens 9 disposed adjacent to the image end. The central incident chief ray and the peripheral incident principal ray are intersected at a point D3 on the optical axis of the system. The surface 61 adjacent to the object end of the crescent lens 6 is plated with an infrared reflecting film whose center of curvature is located on the optical axis of the system. Point, together with the light intersection D3, is located on the left side of the surface & The convex lens 7 is plated with an infrared reflecting film on the surface 72 of the image end, and its center of curvature is located at the point C7 on the optical axis of the system, and is located on the left side of the surface 72 together with the intersection point D3 of the light. The plano-convex lens 8 is also provided with an infrared reflecting film on the surface 82 of the image end, and the center of curvature of the C8 point on the optical axis of the system is also located on the left side of the surface & In the present embodiment, it is preferable that the plating surface is the surface 82 of the convex lens 8, and the incident angle is relatively small since the central incident principal ray a3 and the peripheral incident chief ray are incident on the surface 82, that is, the incident angle is relatively small. M307135 The main slave of this creation infrared optics is composed of all or part of the lens _1! (photosensitive element) inside the digital camera. By using the infrared reflecting film of X on the lens surface Φ, the present invention can block the infrared light of the incident light at the end of the human can. After the person who has blocked the infrared light enters the image, the image sensor converts the light signal, and the electronic component generates a color image signal output that matches the human eye. As described above, the infrared and _stop optical system of the present invention further has a function of blocking infrared rays by providing infrared ray reversal on a lens surface of a shirt, in addition to the basic function of the lens. Therefore, the conventional infrared cutoff device can be omitted, and low cost and miniaturization can be achieved. More importantly, the infrared cut-off optical system of the present invention is provided with an infrared reflecting film on one or more lens faces, and the selection of the coated surfaces satisfies the intersection of the center of curvature and the central incident chief ray and the peripheral incident chief ray. The specific conditions on the same side, so that the best infrared filter effect can be obtained to make the reddish light distribution on the CCD imaging surface average, and enhance the color reproduction performance of the CCD. Preferably, the lens surface is a lens surface having a substantially vertical state when the incident main ray is incident at the center and the periphery thereof, that is, a lens surface having a relatively small incident angle of light, so that the infrared ray is more uniformly reflected, and the cut-off effect of the infrared ray is enhanced. The above disclosure is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the average variation made by those skilled in the art according to the present invention and those skilled in the art are well known to those skilled in the art. Improvements should still fall within the scope of this patent. 11 M307135 [Simple description of the drawings] The first figure is the first embodiment of the present infrared cut-off optical system. The second figure is a second embodiment of the present infrared cut-off optical system. The third figure is a third embodiment of the present infrared cut-off optical system. [Main component symbol description] Crescent lens 1,6 lenticular lens 2, 3 double concave lens 4 convex lens 7
平凸透鏡 8、9 光線交點 D1、D2、D3 中心入射主光線七、a2、a3 紅外截止光學系統10、20、30 第一表面 11、21、3卜4卜61 第二表面 12、22、32、42、72、82 曲率中心 a、C2、C3、C4、C6、C7、C8 周邊入射主光線 bii、bi2、b2l、b22、b3l、b32Plano-convex lens 8, 9 ray intersection D1, D2, D3 center incident chief ray seven, a2, a3 infrared cut-off optical system 10, 20, 30 first surface 11, 21, 3 b 4 b 61 second surface 12, 22, 32 , 42, 72, 82 Curvature centers a, C2, C3, C4, C6, C7, C8 ambient incident chief rays bii, bi2, b2l, b22, b3l, b32
1212