CN114063257B - A wide-angle and large aperture adiabatic fixed-focus security lens - Google Patents
A wide-angle and large aperture adiabatic fixed-focus security lensDownload PDFInfo
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Abstract
Description
Translated fromChinese技术领域：Technical field:
本发明涉及一种广角大光圈消热差定焦安防镜头。The invention relates to a wide-angle, large-aperture, athermal, fixed-focus security lens.
背景技术：Background technology:
视频监控系统想要实现日夜两用，最常用的手段是使用可见光与红外光共焦的镜头搭配红外滤光片切换器，白天用红外滤光片滤除红外光，让可见光成像，晚上可见光微弱则切换成白片，让红外光成像。但是红外光成像的低清晰度和黑白影像无法满足市场对夜晚高质量监控的需求。针对这一问题，从镜头角度可以增大镜头的进光量来实现日夜全彩画面。The most common method for video surveillance systems to achieve day and night use is to use a lens that is confocal with visible light and infrared light and an infrared filter switcher. During the day, the infrared filter is used to filter out infrared light to allow visible light to form an image. At night, when the visible light is weak, the white filter is switched to allow infrared light to form an image. However, the low definition and black-and-white images of infrared light imaging cannot meet the market's demand for high-quality nighttime surveillance. To address this problem, the amount of light entering the lens can be increased from the lens angle to achieve full-color images day and night.
目前安防镜头的结构组成大多以球面与非球面组合构成，如专利号为2020218097746的安防镜头采用就是球面与非球面组合结构，虽然可以实现日夜共焦且高低温不虚焦，但其光圈数为2 ，进光量相对来说并不大，难以满足现阶段对日夜全彩画面的要求，且其对单片镜片的两面均采用非球面，镜片的加工、装调难度大。At present, the structure of security lenses is mostly composed of a combination of spherical and aspherical surfaces. For example, the security lens with patent number 2020218097746 adopts a combination of spherical and aspherical surfaces. Although it can achieve confocality during the day and night and no out-of-focus at high and low temperatures, its aperture number is 2, and the amount of light entering is relatively small, which makes it difficult to meet the current requirements for full-color images during the day and night. In addition, both sides of the single-lens lens are aspherical, which makes the processing and adjustment of the lens difficult.
发明内容：Summary of the invention:
本发明针对上述现有技术存在的问题做出改进，即本发明所要解决的技术问题是提供一种广角大光圈消热差定焦安防镜头。The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a wide-angle, large-aperture, athermal, fixed-focus security lens.
为了实现上述目的，本发明采用的技术方案是：一种广角大光圈消热差定焦安防镜头，该镜头的光学系统包括沿光线入射方向自左向右依次设置的前镜组A、光阑、后镜组B，所述前镜组A包含自左向右依次设置的弯月负透镜A1、双凹负透镜A2、弯月负透镜A3、双凸正透镜A4、双凸正透镜A5以及弯月负透镜A6，所述弯月负透镜A3与双凸正透镜A-4胶合形成第一组胶合透镜；所述后镜组B包含自左向右依次设置的双凸正透镜B1、双凹负透镜B2、双凸正透镜B3以及弯月正透镜B4，所述双凸正透镜B1与双凹负透镜B2胶合形成第二组胶合透镜。In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a wide-angle large aperture athermal fixed-focus security lens, the optical system of which includes a front lens group A, an aperture, and a rear lens group B arranged in sequence from left to right along the incident direction of light, the front lens group A includes a meniscus negative lens A1, a double concave negative lens A2, a meniscus negative lens A3, a double convex positive lens A4, a double convex positive lens A5 and a meniscus negative lens A6 arranged in sequence from left to right, the meniscus negative lens A3 and the double convex positive lens A-4 are glued to form a first group of glued lenses; the rear lens group B includes a double convex positive lens B1, a double concave negative lens B2, a double convex positive lens B3 and a meniscus positive lens B4 arranged in sequence from left to right, the double convex positive lens B1 and the double concave negative lens B2 are glued to form a second group of glued lenses.
进一步的，所述弯月负透镜A1与双凹负透镜A2之间的空气间隔为4.52mm，所述双凹负透镜A2与弯月负透镜A3之间的空气间隔为0.54mm，所述双凸正透镜A4与双凸正透镜A5之间的空气间隔为0.1mm，所述双凸正透镜A5与弯月负透镜A6之间的空气间隔为0.1mm，所述弯月负透镜A6与双凸正透镜B1之间的空气间隔为2.17mm，，所述双凹负透镜B2与双凸正透镜B3之间的空气间隔为1.12mm，所述双凸正透镜B3与弯月正透镜B4之间的空气间隔为0.1mm，所述弯月正透镜B4与像面的空气间隔为5.0mm。Furthermore, the air gap between the meniscus negative lens A1 and the biconcave negative lens A2 is 4.52 mm, the air gap between the biconcave negative lens A2 and the meniscus negative lens A3 is 0.54 mm, the air gap between the biconvex positive lens A4 and the biconvex positive lens A5 is 0.1 mm, the air gap between the biconvex positive lens A5 and the meniscus negative lens A6 is 0.1 mm, the air gap between the meniscus negative lens A6 and the biconvex positive lens B1 is 2.17 mm, the air gap between the biconcave negative lens B2 and the biconvex positive lens B3 is 1.12 mm, the air gap between the biconvex positive lens B3 and the meniscus positive lens B4 is 0.1 mm, and the air gap between the meniscus positive lens B4 and the image plane is 5.0 mm.
进一步的，所述弯月负透镜A1、双凹负透镜A2、弯月负透镜A3、双凸正透镜A4、双凸正透镜A5、弯月负透镜A6、双凸正透镜B1、双凹负透镜B2、双凸正透镜B3以及弯月正透镜B4均为玻璃材质。Furthermore, the meniscus negative lens A1, biconcave negative lens A2, meniscus negative lens A3, biconvex positive lens A4, biconvex positive lens A5, meniscus negative lens A6, biconvex positive lens B1, biconcave negative lens B2, biconvex positive lens B3 and meniscus positive lens B4 are all made of glass.
进一步的，在该镜头的光学系统中，所述双凹负透镜B2的像侧面为非球面，其余表面均为球面。Furthermore, in the optical system of the lens, the image side surface of the biconcave negative lens B2 is an aspherical surface, and the remaining surfaces are spherical surfaces.
进一步的，所述弯月负透镜A1的焦距为f1、双凹负透镜A2的焦距为f2、弯月负透镜A3的焦距为f3、双凸正透镜A4的焦距为f4、双凸正透镜A5的焦距为f5、弯月负透镜A6的焦距为f6、双凸正透镜B1的焦距为f7、双凹负透镜B2的焦距为f8、双凸正透镜B3的焦距为f9、弯月正透镜B4的焦距为f10，各个透镜焦距满足以下关系式：-14≤f1≤-11；-8≤f2≤-5；-22≤f3≤-19；6≤f4≤9；9≤f5≤12；-42≤f6≤-39；4≤f7≤8；-7≤f8≤-4；9≤f9≤12；15≤f10≤20。Furthermore, the focal length of the meniscus negative lens A1 is f1, the focal length of the biconcave negative lens A2 is f2, the focal length of the meniscus negative lens A3 is f3, the focal length of the biconvex positive lens A4 is f4, the focal length of the biconvex positive lens A5 is f5, the focal length of the meniscus negative lens A6 is f6, the focal length of the biconvex positive lens B1 is f7, the focal length of the biconcave negative lens B2 is f8, the focal length of the biconvex positive lens B3 is f9, and the focal length of the meniscus positive lens B4 is f10, and the focal lengths of each lens satisfy the following relationship: -14≤f1≤-11; -8≤f2≤-5; -22≤f3≤-19; 6≤f4≤9; 9≤f5≤12; -42≤f6≤-39; 4≤f7≤8; -7≤f8≤-4; 9≤f9≤12; 15≤f10≤20.
进一步的，所述弯月负透镜A1的中心厚度为0.8mm，所述双凹负透镜A2的中心厚度为0.8mm，所述所述弯月负透镜A3的中心厚度为0.8mm，所述双凸正透镜A4的中心厚度为3.39mm，所述双凸正透镜A5的中心厚度为 2.70mm，所述弯月负透镜A6的中心厚度为1.80mm，所述双凸正透镜B1的中心厚度为2.57mm，所述双凹负透镜B2的中心厚度为0.8mm，所述双凸正透镜B3的中心厚度为2.62mm，所述弯月正透镜B4的中心厚度为2.07mm。Furthermore, the center thickness of the meniscus negative lens A1 is 0.8 mm, the center thickness of the biconcave negative lens A2 is 0.8 mm, the center thickness of the meniscus negative lens A3 is 0.8 mm, the center thickness of the biconvex positive lens A4 is 3.39 mm, the center thickness of the biconvex positive lens A5 is 2.70 mm, the center thickness of the meniscus negative lens A6 is 1.80 mm, the center thickness of the biconvex positive lens B1 is 2.57 mm, the center thickness of the biconcave negative lens B2 is 0.8 mm, the center thickness of the biconvex positive lens B3 is 2.62 mm, and the center thickness of the meniscus positive lens B4 is 2.07 mm.
进一步的，所述弯月负透镜A1的折射率为n1，阿贝数为v1，满足关系式1.5≤n1≤1.6，61≤v1≤62；双凹负透镜A2、双凸正透镜B3的折射率为n2,阿贝数为v2,满足关系式：1.8≤n2≤1.9，46≤v2≤47，弯月负透镜A3、弯月负透镜A6、双凹负透镜B-2的折射率为n3,阿贝数为v3,满足关系式：1.8≤n3≤1.9,23≤v3≤24；双凸正透镜A4、弯月正透镜B4的折射率为n4,阿贝数为v4,满足关系式：1.9≤n4≤2.0，35≤v4≤36；双凸正透镜A5的折射率为n5,阿贝数为v5满足关系式：1.7≤n5≤1.8，47≤v5≤48；双凸正透镜B1的折射率为n6,阿贝数为v6,满足关系式：1.5≤n6≤1.6，68≤v6≤69。Furthermore, the refractive index of the meniscus negative lens A1 is n1, and the Abbe number is v1, which satisfies the relationship 1.5≤n1≤1.6, 61≤v1≤62; the refractive index of the biconcave negative lens A2 and the biconvex positive lens B3 is n2, and the Abbe number is v2, which satisfies the relationship 1.8≤n2≤1.9, 46≤v2≤47; the refractive index of the meniscus negative lens A3, the meniscus negative lens A6, and the biconcave negative lens B-2 is n3, and the Abbe number is v3, which satisfies the relationship 1.8≤n3≤1 .9,23≤v3≤24; the refractive index of the biconvex positive lens A4 and the meniscus positive lens B4 is n4, and the Abbe number is v4, which satisfies the relationship: 1.9≤n4≤2.0, 35≤v4≤36; the refractive index of the biconvex positive lens A5 is n5, and the Abbe number is v5, which satisfies the relationship: 1.7≤n5≤1.8, 47≤v5≤48; the refractive index of the biconvex positive lens B1 is n6, and the Abbe number is v6, which satisfies the relationship: 1.5≤n6≤1.6, 68≤v6≤69.
与现有技术相比，本发明具有以下效果：本发明设计合理，光学结构紧凑，具有大光圈，可以提高夜晚成像的亮度与清晰度。Compared with the prior art, the present invention has the following effects: the present invention has reasonable design, compact optical structure, and large aperture, and can improve the brightness and clarity of night imaging.
附图说明：Description of the drawings:
图1是本发明实施例中光学系统的构造示意图；FIG1 is a schematic diagram of the structure of an optical system in an embodiment of the present invention;
图2是本发明实施例中在工作温度为20℃下的MTF曲线；FIG2 is an MTF curve of an embodiment of the present invention at an operating temperature of 20° C.;
图3是本发明实施例中在工作温度为-40℃下的MTF曲线；FIG3 is an MTF curve of an embodiment of the present invention at an operating temperature of -40°C;
图4是本发明实施例中在工作温度为80℃下的MTF曲线；FIG4 is an MTF curve of an embodiment of the present invention at an operating temperature of 80° C.;
图5是本发明实施例的相对照度图；FIG5 is a relative illumination diagram of an embodiment of the present invention;
图6是本发明实施例CRA角度示意图；FIG6 is a schematic diagram of a CRA angle according to an embodiment of the present invention;
图7是本发明实施例中工作温度为20℃下的点列图。FIG. 7 is a point diagram at an operating temperature of 20° C. in an embodiment of the present invention.
图中：In the figure:
A1-弯月负透镜A1；A2-双凹负透镜A2；A3-弯月负透镜A3；A4-双凸正透镜A4；A5-双凸正透镜A5；A6-弯月负透镜A6；B1-双凸正透镜B1；B2-双凹负透镜B2；B3-双凸正透镜B3；B4-弯月正透镜B4；C-光阑。A1-meniscus negative lens A1; A2-biconcave negative lens A2; A3-meniscus negative lens A3; A4-biconvex positive lens A4; A5-biconvex positive lens A5; A6-meniscus negative lens A6; B1-biconvex positive lens B1; B2-biconcave negative lens B2; B3-biconvex positive lens B3; B4-meniscus positive lens B4; C-aperture.
具体实施方式:Specific implementation method:
下面结合附图和具体实施方式对本发明做进一步详细的说明。The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
在本发明的描述中，需要理解的是，术语“ 纵向”、“ 横向”、“上”、“ 下”、“ 前”、“ 后”、“ 左”、“ 右”、“ 竖直”、“ 水平”、“ 顶”、“ 底”、“ 内”、“ 外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
如图1所示，本发明一种广角大光圈消热差定焦安防镜头，该镜头的光学系统包括沿光线入射方向自左向右依次设置的前镜组A、光阑、后镜组B，所述前镜组A包含沿光线入射方向自左向右依次设置的弯月负透镜A1、双凹负透镜A2、弯月负透镜A3、双凸正透镜A4、双凸正透镜A5以及弯月负透镜A6，所述弯月负透镜A3与双凸正透镜A-4胶合形成第一组胶合透镜；所述后镜组B包含沿光线入射方向自左向右依次设置的双凸正透镜B1、双凹负透镜B2、双凸正透镜B3以及弯月正透镜B4，所述双凸正透镜B1与双凹负透镜B2胶合形成第二组胶合透镜。As shown in FIG1 , the present invention discloses a wide-angle, large-aperture, athermal fixed-focus security lens. The optical system of the lens comprises a front lens group A, an aperture, and a rear lens group B, which are sequentially arranged from left to right along the incident direction of light. The front lens group A comprises a meniscus negative lens A1, a biconcave negative lens A2, a meniscus negative lens A3, a biconvex positive lens A4, a biconvex positive lens A5, and a meniscus negative lens A6, which are sequentially arranged from left to right along the incident direction of light. The meniscus negative lens A3 is glued with the biconvex positive lens A-4 to form a first group of glued lenses. The rear lens group B comprises a biconvex positive lens B1, a biconcave negative lens B2, a biconvex positive lens B3, and a meniscus positive lens B4, which are sequentially arranged from left to right along the incident direction of light. The biconvex positive lens B1 is glued with the biconcave negative lens B2 to form a second group of glued lenses.
本实施例中，所述弯月负透镜A1与双凹负透镜A2之间的空气间隔为4.52mm，所述双凹负透镜A2与弯月负透镜A3之间的空气间隔为0.54mm，所述双凸正透镜A4与双凸正透镜A5之间的空气间隔为0.1mm，所述双凸正透镜A5与弯月负透镜A6之间的空气间隔为0.1mm，所述弯月负透镜A6与双凸正透镜B1之间的空气间隔为2.17mm，，所述双凹负透镜B2与双凸正透镜B3之间的空气间隔为1.12mm，所述双凸正透镜B3与弯月正透镜B4之间的空气间隔为0.1mm，所述弯月正透镜B4与像面的空气间隔为5.0mm。In this embodiment, the air gap between the meniscus negative lens A1 and the biconcave negative lens A2 is 4.52 mm, the air gap between the biconcave negative lens A2 and the meniscus negative lens A3 is 0.54 mm, the air gap between the biconvex positive lens A4 and the biconvex positive lens A5 is 0.1 mm, the air gap between the biconvex positive lens A5 and the meniscus negative lens A6 is 0.1 mm, the air gap between the meniscus negative lens A6 and the biconvex positive lens B1 is 2.17 mm, the air gap between the biconcave negative lens B2 and the biconvex positive lens B3 is 1.12 mm, the air gap between the biconvex positive lens B3 and the meniscus positive lens B4 is 0.1 mm, and the air gap between the meniscus positive lens B4 and the image plane is 5.0 mm.
本实施例中，所述弯月负透镜A1、双凹负透镜A2、弯月负透镜A3、双凸正透镜A4、双凸正透镜A5、弯月负透镜A6、双凸正透镜B1、双凹负透镜B2、双凸正透镜B3以及弯月正透镜B4均为玻璃材质。In this embodiment, the meniscus negative lens A1, biconcave negative lens A2, meniscus negative lens A3, biconvex positive lens A4, biconvex positive lens A5, meniscus negative lens A6, biconvex positive lens B1, biconcave negative lens B2, biconvex positive lens B3 and meniscus positive lens B4 are all made of glass.
本实施例中，在该镜头的光学系统中，所述双凹负透镜B2的像侧面为非球面，其余表面均为球面。。其中非球面的圆锥系数为0，第4、6、8次非球面系数A4为2.17*10-5、A6为3.523*10-8、A8为-9.27*10-11。非球面镜片满足以下公式：In this embodiment, in the optical system of the lens, the image side surface of the biconcave negative lens B2 is an aspherical surface, and the other surfaces are spherical surfaces. The cone coefficient of the aspherical surface is 0, and the 4th, 6th, and 8th aspherical coefficientsA4 are 2.17*10-5 ,A6 is 3.523*10-8 , andA8 is -9.27*10-11 . The aspherical lens satisfies the following formula:
式中Z是平行于光轴的表面的表面轮廓，s是与光轴之间的径向距离，C是曲率，K是圆锥常数，A4、A6、A8...第4、6、8… 次非球面系数。Where Z is the surface profile of the surface parallel to the optical axis, s is the radial distance from the optical axis, C is the curvature, K is the cone constant, and A4 , A6 , A8 ... are the 4th, 6th, 8th... aspheric coefficients.
本实施例中，所述弯月负透镜A1的焦距为f1、双凹负透镜A2的焦距为f2、弯月负透镜A3的焦距为f3、双凸正透镜A4的焦距为f4、双凸正透镜A5的焦距为f5、弯月负透镜A6的焦距为f6、双凸正透镜B1的焦距为f7、双凹负透镜B2的焦距为f8、双凸正透镜B3的焦距为f9、弯月正透镜B4的焦距为f10，各个透镜焦距满足以下关系式：-14≤f1≤-11；-8≤f2≤-5；-22≤f3≤-19；6≤f4≤9；9≤f5≤12；-42≤f6≤-39；4≤f7≤8；-7≤f8≤-4；9≤f9≤12；15≤f10≤20。In this embodiment, the focal length of the meniscus negative lens A1 is f1, the focal length of the biconcave negative lens A2 is f2, the focal length of the meniscus negative lens A3 is f3, the focal length of the biconvex positive lens A4 is f4, the focal length of the biconvex positive lens A5 is f5, the focal length of the meniscus negative lens A6 is f6, the focal length of the biconvex positive lens B1 is f7, the focal length of the biconcave negative lens B2 is f8, the focal length of the biconvex positive lens B3 is f9, and the focal length of the meniscus positive lens B4 is f10, and the focal lengths of each lens satisfy the following relationship: -14≤f1≤-11; -8≤f2≤-5; -22≤f3≤-19; 6≤f4≤9; 9≤f5≤12; -42≤f6≤-39; 4≤f7≤8; -7≤f8≤-4; 9≤f9≤12; 15≤f10≤20.
本实施例中，所述弯月负透镜A1的中心厚度为0.8mm，所述双凹负透镜A2的中心厚度为0.8mm，所述所述弯月负透镜A3的中心厚度为0.8mm，所述双凸正透镜A4的中心厚度为3.39mm，所述双凸正透镜A5的中心厚度为 2.70mm，所述弯月负透镜A6的中心厚度为1.80mm，所述双凸正透镜B1的中心厚度为2.57mm，所述双凹负透镜B2的中心厚度为0.8mm，所述双凸正透镜B3的中心厚度为2.62mm，所述弯月正透镜B4的中心厚度为2.07mm。In this embodiment, the center thickness of the meniscus negative lens A1 is 0.8 mm, the center thickness of the biconcave negative lens A2 is 0.8 mm, the center thickness of the meniscus negative lens A3 is 0.8 mm, the center thickness of the biconvex positive lens A4 is 3.39 mm, the center thickness of the biconvex positive lens A5 is 2.70 mm, the center thickness of the meniscus negative lens A6 is 1.80 mm, the center thickness of the biconvex positive lens B1 is 2.57 mm, the center thickness of the biconcave negative lens B2 is 0.8 mm, the center thickness of the biconvex positive lens B3 is 2.62 mm, and the center thickness of the meniscus positive lens B4 is 2.07 mm.
本实施例中，所述弯月负透镜A1的折射率为n1，阿贝数为v1，满足关系式1.5≤n1≤1.6，61≤v1≤62；双凹负透镜A2、双凸正透镜B3的折射率为n2,阿贝数为v2,满足关系式：1.8≤n2≤1.9，46≤v2≤47，弯月负透镜A3、弯月负透镜A6、双凹负透镜B-2的折射率为n3,阿贝数为v3,满足关系式：1.8≤n3≤1.9,23≤v3≤24；双凸正透镜A4、弯月正透镜B4的折射率为n4,阿贝数为v4,满足关系式：1.9≤n4≤2.0，35≤v4≤36；双凸正透镜A5的折射率为n5,阿贝数为v5满足关系式：1.7≤n5≤1.8，47≤v5≤48；双凸正透镜B1的折射率为n6,阿贝数为v6,满足关系式：1.5≤n6≤1.6，68≤v6≤69。In this embodiment, the refractive index of the meniscus negative lens A1 is n1, the Abbe number is v1, and the relationship 1.5≤n1≤1.6, 61≤v1≤62 is satisfied; the refractive index of the biconcave negative lens A2 and the biconvex positive lens B3 is n2, the Abbe number is v2, and the relationship 1.8≤n2≤1.9, 46≤v2≤47 is satisfied; the refractive index of the meniscus negative lens A3, the meniscus negative lens A6, and the biconcave negative lens B-2 is n3, the Abbe number is v3, and the relationship 1.8≤n3≤ 1.9, 23≤v3≤24; the refractive index of the biconvex positive lens A4 and the meniscus positive lens B4 is n4, and the Abbe number is v4, which satisfies the relationship: 1.9≤n4≤2.0, 35≤v4≤36; the refractive index of the biconvex positive lens A5 is n5, and the Abbe number is v5, which satisfies the relationship: 1.7≤n5≤1.8, 47≤v5≤48; the refractive index of the biconvex positive lens B1 is n6, and the Abbe number is v6, which satisfies the relationship: 1.5≤n6≤1.6, 68≤v6≤69.
本实施例中，光学系统的工作波长在可见光范围内划分成四个波段，并赋予不同权重，使得本系统适用于更宽的光谱下清晰成像。In this embodiment, the working wavelength of the optical system is divided into four bands within the visible light range and assigned different weights, so that the system is suitable for clear imaging under a wider spectrum.
本实施例中，该镜头采用十片玻璃镜片，光学结构紧凑，F数不小于1.2，焦距不小于5 mm，工作温度范围在-40至+80℃，工作波段为可见光波段，视场角不小于110°，相对照度大于40%，且120线对下的MTF大于0.4，可适配1/1.8英寸的感光芯片。该光学系统具有的大光圈，可以提高夜晚成像的亮度与清晰度，在后置加入红外滤光片切换器，实现日夜两用的安防镜头。In this embodiment, the lens uses ten glass lenses, has a compact optical structure, an F number of not less than 1.2, a focal length of not less than 5 mm, an operating temperature range of -40 to +80°C, an operating band of visible light, a field of view of not less than 110°, a relative illumination of more than 40%, and an MTF of more than 0.4 under 120 line pairs, and can be adapted to a 1/1.8-inch photosensitive chip. The large aperture of the optical system can improve the brightness and clarity of night imaging, and an infrared filter switcher is added to the rear to achieve a day and night security lens.
本实施例中，各个镜片需满足表1所示的参数要求。In this embodiment, each lens must meet the parameter requirements shown in Table 1.
表1 镜片参数表Table 1 Lens parameters
通过上述表1中的镜片参数，该镜头达到了以下光学指标：According to the lens parameters in Table 1 above, the lens achieves the following optical indicators:
（1）焦距为5mm；(1) Focal length is 5 mm;
（2）像方空间F数为1.2；(2) The image space F number is 1.2;
（3）视场角不小于110°，具有广角特性；(3) The field of view is not less than 110° and has wide-angle characteristics;
（4）光学总长为32.0mm；(4) The total optical length is 32.0 mm;
（5）光学后焦为4.997mm；(5) Optical back focus is 4.997mm;
（6）CRA小于10°；(6) CRA is less than 10°;
（7）相对照度大于40% ；(7) Relative illumination greater than 40%;
（8）工作温度范围在-40℃至+80℃，具有消热差功能；(8) The operating temperature range is -40℃ to +80℃, with heat elimination function;
（9）镜头最大可适配1/1.8英寸靶面（有效靶面为Φ9.0mm）的感光芯片；(9) The lens can adapt to photosensitive chips with a maximum target surface of 1/1.8 inches (effective target surface is Φ9.0mm);
（10）工作波长在可见光范围内划分四个波段，使得本系统适用于更宽的光谱下清晰成像；(10) The working wavelength is divided into four bands in the visible light range, making the system suitable for clear imaging in a wider spectrum;
（11）镜头的MTF大于0.4@120lp/mm，可提供高清分辨率的影像。(11) The MTF of the lens is greater than 0.4@120lp/mm, which can provide high-definition resolution images.
本实施例中，如图2-4所示，在工作温度为-40℃、20℃、80℃时，系统在120lp/mm线对的MTF都能达到0.4以上；图5所示，系统的相对照度大于40%；图6所示，主光线角度在全视场内小于10度；图7所示，最大RMS半径小于4um，该光学系统满足安防镜头的像质要求。In this embodiment, as shown in Figures 2-4, when the operating temperatures are -40°C, 20°C, and 80°C, the MTF of the system at 120lp/mm line pairs can reach above 0.4; as shown in Figure 5, the relative illumination of the system is greater than 40%; as shown in Figure 6, the chief ray angle is less than 10 degrees in the full field of view; as shown in Figure 7, the maximum RMS radius is less than 4um, and the optical system meets the image quality requirements of security lenses.
本发明的镜头拥有大光圈和大进光量，微光夜视成像镜头效果清晰锐利，使得成像设备在极微弱的环境下可以拍摄出清晰亮丽的图像，大大提高了夜晚动态和静态监测的画面质量。The lens of the present invention has a large aperture and a large amount of light entering, and the low-light-level night vision imaging lens has a clear and sharp effect, so that the imaging device can take clear and bright images in extremely weak environments, greatly improving the picture quality of dynamic and static monitoring at night.
另外，上述本发明公开的任一技术方案中所应用的用于表示位置关系或形状的术语除另有声明外其含义包括与其近似、类似或接近的状态或形状。In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制；尽管参照较佳实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者对部分技术特征进行等同替换；而不脱离本发明技术方案的精神，其均应涵盖在本发明请求保护的技术方案范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.
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