CN115933117A - Day and night confocal lens and imaging device - Google Patents
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Translated fromChinese技术领域technical field
本发明涉及光学技术领域，尤其涉及日夜共焦镜头和成像装置。The invention relates to the field of optical technology, in particular to a day and night confocal lens and an imaging device.
背景技术Background technique
随着科技的高速发展，广角镜头由于具备视场角大，拍摄画幅广的优点，广泛应用于安防、车载、智能家居等方面。但由于应用环境的差别，消费者的要求也越来越高。在某些环境复杂的应用场景里，要求镜头在高低温温差较大的条件，镜头能够不离焦；同时保证在白天和黑夜情况下都能有效工作，满足拍摄需求；目前消费市场朝着低成本、小型化的趋势发展，但很多同类产品镜片较多，结构较为复杂，为此研究小型化低成本的日夜共焦镜头具有很强的实用性。With the rapid development of science and technology, wide-angle lenses are widely used in security, vehicle, smart home and other aspects due to their advantages of large field of view and wide shooting frame. However, due to the difference in the application environment, the requirements of consumers are getting higher and higher. In some application scenarios with complex environments, it is required that the lens can not defocus under the condition of large temperature difference between high and low temperature; at the same time, it can work effectively in day and night to meet the shooting needs; the current consumer market is moving towards low cost , The trend of miniaturization is developing, but many similar products have more lenses and more complex structures. Therefore, it is very practical to study miniaturized and low-cost day and night confocal lenses.
发明内容Contents of the invention
本发明的主要目的是提出一种日夜共焦镜头和成像装置，旨在提供一种超大视场角、能日夜共焦的小型日夜共焦镜头。The main purpose of the present invention is to provide a day and night confocal lens and an imaging device, aiming to provide a small day and night confocal lens with super large field of view and capable of confocal day and night.
为实现上述目的，本发明提出的一种日夜共焦镜头，所述日夜共焦镜头具有沿光轴方向呈相对设置的物侧和像侧，所述日夜共焦镜头包括自物侧至像侧依次设置的光焦度为负的第一凸凹透镜、光焦度为负的第二双凹透镜、光焦度为负的第三凸凹透镜、光焦度为正的第四双凸透镜、光焦度为负的第五双凹透镜、光焦度为正的第六双凸透镜，且所述第一凸凹透镜和所述第三凸凹透镜的凹面朝向像侧设置；In order to achieve the above object, the present invention proposes a day and night confocal lens, the day and night confocal lens has an object side and an image side that are oppositely arranged along the optical axis direction, and the day and night confocal lens includes a lens from the object side to the image side The first convex-convex lens with negative power, the second bi-concave lens with negative power, the third convex-concave lens with negative power, the fourth double-convex lens with positive power, and the fourth double-convex lens with positive power are arranged in sequence. a negative fifth biconvex lens, a sixth biconvex lens with positive refractive power, and the concave surfaces of the first convex-concave lens and the third convex-concave lens are set toward the image side;
所述日夜共焦镜头的光学总长TTL≤13mm，所述日夜共焦镜头的光圈数为F，且1.8≤F≤2.4，视场角FOV＝195°±5％。The total optical length of the day and night confocal lens TTL≤13mm, the aperture number of the day and night confocal lens is F, and 1.8≤F≤2.4, and the field of view FOV=195°±5%.
可选地，所述日夜共焦镜头还满足以下条件：Optionally, the day and night confocal lens also meets the following conditions:
-4＜f1＜-2；-5.4＜f2＜-4.6；2.6＜f3＜4.8；2.4＜f4＜4.0；-3.2＜f5＜-1.6；2.4＜f6＜3.5；-4<f1<-2; -5.4<f2<-4.6; 2.6<f3<4.8; 2.4<f4<4.0; -3.2<f5<-1.6; 2.4<f6<3.5;
其中，所述第一凸凹透镜的焦距为f1，所述第二双凹透镜的焦距为f2，所述第三凸凹透镜的焦距为f3，所述第四双凸透镜的焦距为f4，所述第五双凹透镜的焦距为f5，所述第六双凸透镜的焦距为f6。Wherein, the focal length of the first convex-concave lens is f1, the focal length of the second bi-concave lens is f2, the focal length of the third convex-concave lens is f3, the focal length of the fourth bi-convex lens is f4, and the focal length of the fifth bi-convex lens is f2. The focal length of the biconcave lens is f5, and the focal length of the sixth biconvex lens is f6.
可选地，所述日夜共焦镜头还满足以下条件：Optionally, the day and night confocal lens also meets the following conditions:
1.60≤n1≤1.80；1.50≤n2≤1.60；1.55≤n3≤1.70；1.50≤n4≤1.70；1.60≤n5≤1.70；1.50≤n6≤1.75；1.60≤n1≤1.80; 1.50≤n2≤1.60; 1.55≤n3≤1.70; 1.50≤n4≤1.70; 1.60≤n5≤1.70; 1.50≤n6≤1.75;
其中，所述第一凸凹透镜的折射率为n1，所述第二双凹透镜的折射率为n2，所述第三凸凹透镜的折射率为n3，所述第四双凸透镜的折射率为n4，所述第五双凹透镜的折射率为n5，所述第六双凸透镜的折射率为n6。Wherein, the refractive index of the first convex-convex lens is n1, the refractive index of the second bi-concave lens is n2, the refractive index of the third convex-concave lens is n3, and the refractive index of the fourth bi-convex lens is n4, The refractive index of the fifth biconcave lens is n5, and the refractive index of the sixth biconvex lens is n6.
可选地，所述日夜共焦镜头还满足以下条件：Optionally, the day and night confocal lens also meets the following conditions:
50.0≤v1≤65.0；50.0≤v2≤75.0；18.0≤v3≤26.0；60.0≤v4≤75.0；20.0≤v5≤35.0；50.0≤v6≤60.0；50.0≤v1≤65.0; 50.0≤v2≤75.0; 18.0≤v3≤26.0; 60.0≤v4≤75.0; 20.0≤v5≤35.0; 50.0≤v6≤60.0;
其中，所述第一凸凹透镜的色散系数为v1，所述第二双凹透镜的色散系数为v2，所述第三凸凹透镜的色散系数为v3，所述第四双凸透镜的色散系数为v4，所述第五双凹透镜的色散系数为v5，所述第六双凸透镜的色散系数为v6。Wherein, the dispersion coefficient of the first convex-convex lens is v1, the dispersion coefficient of the second bi-concave lens is v2, the dispersion coefficient of the third convex-concave lens is v3, and the dispersion coefficient of the fourth bi-convex lens is v4, The dispersion coefficient of the fifth biconvex lens is v5, and the dispersion coefficient of the sixth biconvex lens is v6.
可选地，所述第二双凹透镜、所述第三凸凹透镜、所述第五双凹透镜、所述第六双凸透镜均为塑胶非球面透镜；Optionally, the second bi-concave lens, the third convex-concave lens, the fifth bi-concave lens, and the sixth bi-convex lens are all plastic aspheric lenses;
所述第一凸凹透镜、所述第四双凸透镜为玻璃球面透镜。The first convex-concave lens and the fourth bi-convex lens are glass spherical lenses.
可选地，所述日夜共焦镜头的有效焦距为EFL，所述日夜共焦镜头的光学总长为TTL，其中，TTL/EFL≤5.95。Optionally, the effective focal length of the day and night confocal lens is EFL, and the total optical length of the day and night confocal lens is TTL, wherein TTL/EFL≤5.95.
可选地，所述第一凸凹透镜的直径为D1，所述日夜共焦镜头的光学总长为TTL，其中，D1/TTL＜0.55。Optionally, the diameter of the first convex-concave lens is D1, and the total optical length of the day-night confocal lens is TTL, wherein D1/TTL<0.55.
可选地，所述日夜共焦镜头的像面直径IC满足：6mm≤IC≤7.2mm。Optionally, the image plane diameter IC of the day and night confocal lens satisfies: 6mm≤IC≤7.2mm.
可选地，所述日夜共焦镜头自物侧到像侧依次还包括光阑、保护玻璃和感光芯片，所述光阑设于所述第三凸凹透镜和所述第四双凸透镜之间，所述保护玻璃和所述感光芯片设于所述第六双凸透镜靠近像侧的一侧。Optionally, the day and night confocal lens further includes an aperture, a protective glass, and a photosensitive chip in sequence from the object side to the image side, and the aperture is arranged between the third convex-convex lens and the fourth bi-convex lens, The protective glass and the photosensitive chip are arranged on the side of the sixth lenticular lens close to the image side.
本发明还提供一种成像装置，所述成像装置包括上述的日夜共焦镜头。The present invention also provides an imaging device, which includes the above-mentioned day and night confocal lens.
本发明提供的技术方案中，自物侧至像侧依次设置有光焦度为负的第一凸凹透镜、光焦度为负的第二双凹透镜、光焦度为负的第三凸凹透镜、光焦度为正的第四双凸透镜、光焦度为负的第五双凹透镜、光焦度为正的第六双凸透镜，通过第一凸凹透镜具有的大口径，对同等焦距情况下可收集更多的光信息，达到弱光下清晰成像的效果，可有效增大监控视场范围，通过所述第四双凸透镜承担了系统较大的光焦度，改变光束的传播方向，更有利于光束在像面上成像，通过六个透镜的光焦度以及形状的合理设置，可实现低成本且轻量化，所述日夜共焦镜头能够很好地控制光线走势，在引入更多的光线的同时使结构更加紧凑，使得所述日夜共焦镜头的总长控制在13mm以内，并通过合理布置非球面透镜使得各种像差得到校正，提升了边缘画质，成像质量高。在孔径方面，光圈值F满足1.8≤F≤2.4，支持1/2.7英寸的像面，所述日夜共焦镜头在弱光下也可清晰成像，且通过合理设定焦距比使得镜头在-40℃～+85℃的环境条件下不离焦，工作性能更加稳定，视场角可达195°±5％，能获得数据信息更加充分，以提供一种大光圈、大角度、小型高低温的日夜共焦镜头。In the technical solution provided by the present invention, a first convex-concave lens with negative refractive power, a second bi-concave lens with negative refractive power, a third convex-concave lens with negative refractive power, The fourth double-convex lens with positive power, the fifth double-concave lens with negative power, and the sixth double-convex lens with positive power, through the large diameter of the first convex-concave lens, can collect More light information can achieve the effect of clear imaging under weak light, which can effectively increase the scope of the monitoring field of view. The fourth double-convex lens undertakes a larger optical power of the system and changes the propagation direction of the beam, which is more conducive to The light beam is imaged on the image plane. Through the reasonable setting of the focal power and shape of the six lenses, low cost and light weight can be achieved. The day and night confocal lens can well control the light trend and introduce more light. At the same time, the structure is made more compact, so that the total length of the day and night confocal lens is controlled within 13mm, and various aberrations are corrected by rationally arranging aspheric lenses, which improves the edge quality and high imaging quality. In terms of aperture, the aperture value F satisfies 1.8≤F≤2.4, and supports a 1/2.7-inch image surface. The day and night confocal lens can also image clearly in low light, and the lens can be set at -40 by setting the focal length ratio reasonably. It does not defocus under the environmental conditions of ℃～+85℃, the working performance is more stable, the field of view can reach 195°±5%, and the data information can be obtained more fully, so as to provide a large aperture, large angle, small high and low temperature day and night confocal lens.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.
图1为本发明提供的日夜共焦镜头的结构示意图；Fig. 1 is the structural representation of day and night confocal lens provided by the present invention;
图2为图1中的日夜共焦镜头的球差曲线示意图；Fig. 2 is a schematic diagram of the spherical aberration curve of the day and night confocal lens in Fig. 1;
图3为图1中的日夜共焦镜头的光线光扇示意图；Fig. 3 is a schematic diagram of the light fan of the day and night confocal lens in Fig. 1;
图4为图1中的日夜共焦镜头的场区畸变/场曲示意图；Fig. 4 is a schematic diagram of field distortion/field curvature of the day and night confocal lens in Fig. 1;
图5为图1中的日夜共焦镜头的MTF示意图。FIG. 5 is a schematic diagram of the MTF of the day and night confocal lens in FIG. 1 .
附图标号说明：Explanation of reference numbers:
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
需要说明，若本发明实施例中有涉及方向性指示(诸如上、下、左、右、前、后……)，则该方向性指示仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.
另外，若本发明实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，全文中出现的“和/或”的含义，包括三个并列的方案，以“A和/或B”为例，包括A方案、或B方案、或A和B同时满足的方案。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B" as an example, including scheme A, scheme B, or schemes that both A and B satisfy. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.
目前闭路监控行业都在朝小型化、多功能、环境适应能力强的方向发展。但是，现有技术主要存在如下缺陷：因不同地域环境复杂，不能适应温差大的环境，容易造成离焦影响拍摄效果。并且监控摄像机长时间工作时，自身存在电路发热，高温情况下影响镜头的聚焦。在夜间或光线较暗地域，现有摄像机容易产生红外补光下色彩缺失、细节不清晰和亮度不足，成像质量差。拍摄角度小，视野范围窄，采集的数据信息不充分。At present, the closed-circuit monitoring industry is developing in the direction of miniaturization, multi-function, and strong environmental adaptability. However, the existing technology mainly has the following defects: due to the complex environment in different regions, it cannot adapt to the environment with large temperature difference, and it is easy to cause defocusing and affect the shooting effect. And when the surveillance camera works for a long time, its own circuit heats up, which affects the focus of the lens under high temperature conditions. At night or in areas with low light, existing cameras are prone to lack of color, unclear details and insufficient brightness under infrared supplementary light, resulting in poor image quality. The shooting angle is small, the field of view is narrow, and the collected data information is insufficient.
为了解决上述问题，本发明提供一种日夜共焦镜头，图1至图5为本发明提供的日夜共焦镜头的具体实施例。In order to solve the above problems, the present invention provides a day and night confocal lens, and FIG. 1 to FIG. 5 are specific embodiments of the day and night confocal lens provided by the present invention.
请参阅图1，所述日夜共焦镜头具有沿光轴方向呈相对设置的物侧和像侧，所述日夜共焦镜头具有沿光轴方向呈相对设置的物侧和像侧，所述日夜共焦镜头包括自物侧至像侧依次设置的光焦度为负的第一凸凹透镜1、光焦度为负的第二双凹透镜2、光焦度为负的第三凸凹透镜3、光焦度为正的第四双凸透镜4、光焦度为负的第五双凹透镜5、光焦度为正的第六双凸透镜6，且所述第一凸凹透镜1和所述第三凸凹透镜3的凹面朝向像侧设置；所述日夜共焦镜头的光学总长TTL≤13mm，所述日夜共焦镜头的光圈数为F，且1.8≤F≤2.4，视场角FOV＝195°±5％。Please refer to Figure 1, the day and night confocal lens has an object side and an image side that are oppositely arranged along the optical axis, the day and night confocal lens has an object side and an image side that are oppositely arranged along the optical axis, the day and night The confocal lens includes a first convex-
本发明提供的技术方案中，自物侧至像侧依次设置有光焦度为负的第一凸凹透镜1、光焦度为负的第二双凹透镜2、光焦度为负的第三凸凹透镜3、光焦度为正的第四双凸透镜4、光焦度为负的第五双凹透镜5、光焦度为正的第六双凸透镜6，通过第一凸凹透镜1具有的大口径，对同等焦距情况下可收集更多的光信息，达到弱光下清晰成像的效果，可有效增大监控视场范围，通过所述第四双凸透镜4承担了系统较大的光焦度，改变光束的传播方向，更有利于光束在像面上成像，通过六个透镜的光焦度以及形状的合理设置，可实现低成本且轻量化，所述日夜共焦镜头能够很好地控制光线走势，在引入更多的光线的同时使结构更加紧凑，使得所述日夜共焦镜头的总长控制在13mm以内，并通过合理布置非球面透镜使得各种像差得到校正，提升了边缘画质，成像质量高。在孔径方面，光圈值F满足1.8≤F≤2.4，支持1/2.7英寸的像面，所述日夜共焦镜头在弱光下也可清晰成像，且通过合理设定焦距比使得镜头在-40℃～+85℃的环境条件下不离焦，工作性能更加稳定，视场角可达195°±5％，能获得数据信息更加充分，以提供一种大光圈、大角度、小型高低温的日夜共焦镜头。In the technical solution provided by the present invention, a first convex-
具体地，在本实施例中，所述日夜共焦镜头还满足以下条件：-4＜f1＜-2；-5.4＜f2＜-4.6；2.6＜f3＜4.8；2.4＜f4＜4.0；-3.2＜f5＜-1.6；2.4＜f6＜3.5；其中，所述第一凸凹透镜1的焦距为f1，所述第二双凹透镜2的焦距为f2，所述第三凸凹透镜3的焦距为f3，所述第四双凸透镜4的焦距为f4，所述第五双凹透镜5的焦距为f5，所述第六双凸透镜6的焦距为f6。通过不同透镜的相互组合及其合理分配光焦度，使光学系统具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。Specifically, in this embodiment, the day and night confocal lens also satisfies the following conditions: -4<f1<-2; -5.4<f2<-4.6; 2.6<f3<4.8; 2.4<f4<4.0; -3.2 <f5<-1.6; 2.4<f6<3.5; wherein, the focal length of the first convex-
具体地，在本实施例中，所述日夜共焦镜头还满足以下条件：Specifically, in this embodiment, the day and night confocal lens also meets the following conditions:
1.60≤n1≤1.80；1.50≤n2≤1.60；1.55≤n3≤1.70；1.50≤n4≤1.70；1.60≤n5≤1.70；1.50≤n6≤1.75；1.60≤n1≤1.80; 1.50≤n2≤1.60; 1.55≤n3≤1.70; 1.50≤n4≤1.70; 1.60≤n5≤1.70; 1.50≤n6≤1.75;
其中，所述第一凸凹透镜1的折射率为n1，所述第二双凹透镜2的折射率为n2，所述第三凸凹透镜3的折射率为n3，所述第四双凸透镜4的折射率为n4，所述第五双凹透镜5的折射率为n5，所述第六双凸透镜6的折射率为n6。Wherein, the refractive index of the first convex-
具体地，在光学透镜中，光的色散会导致不理想的色差，从而导致被观察物体周围的模糊或模糊效果或“色边”，为了使得所述日夜共焦镜头能够有较好的成像品质，在本实施例中，所述日夜共焦镜头还满足以下条件：Specifically, in optical lenses, the dispersion of light can lead to undesirable chromatic aberration, resulting in a blurring or blurring effect or "color fringing" around the observed object, in order to enable the day and night confocal lens to have better imaging quality , in this embodiment, the day and night confocal lens also meets the following conditions:
50.0≤v1≤65.0；50.0≤v2≤75.0；18.0≤v3≤26.0；60.0≤v4≤75.0；20.0≤v5≤35.0；50.0≤v6≤60.0；50.0≤v1≤65.0; 50.0≤v2≤75.0; 18.0≤v3≤26.0; 60.0≤v4≤75.0; 20.0≤v5≤35.0; 50.0≤v6≤60.0;
其中，所述第一凸凹透镜1的色散系数为v1，所述第二双凹透镜2的色散系数为v2，所述第三凸凹透镜3的色散系数为v3，所述第四双凸透镜4的色散系数为v4，所述第五双凹透镜5的色散系数为v5，所述第六双凸透镜6的色散系数为v6。色散系数为v7。色散系数是用来衡量透明介质的光线色散程度。阿贝数就是用以表示透明介质色散能力的指数，色散系数(阿贝数)越大，色散越不明显，镜片的成像品质越好，在本实施例中的各透镜将色散系数控制在较高值，使得所述日夜共焦镜头的色散不明显，镜头的成像品质好。Wherein, the dispersion coefficient of the first convex-
具体地，因树脂镜头的抗冲击能力较强，重量较轻，同时成本也低，在本实施例中，所述第二双凹透镜2、所述第三凸凹透镜3、所述第五双凹透镜5、所述第六双凸透镜6均为塑胶非球面透镜；通过采用塑料非球面透镜有效地控制成本，且通过非球面透镜可以很好的矫正镜头色差，在保证镜头紫边控制情况下，同时矫正高倍位置的球差和正弦差。Specifically, because the resin lens has strong impact resistance, light weight, and low cost, in this embodiment, the second
但是因塑胶材料受环境温度影响的化学特性较为不稳定，其折射率相较全玻璃镜头较弱，导致画面还原度上差于全玻璃镜头，为了保证所述视讯镜头受温度变化的稳定性，在本实施例中，所述第一凸凹透镜1、所述第四双凸透镜4为玻璃球面透镜。因玻璃透镜不容易受热胀冷缩的影响出现跑焦现象，因此玻璃透镜可以很好的抵抗镜头受热变形的问题，长时间保持镜头的高精度。所述日夜共焦镜头采用玻塑混合材质，不仅节省成本，抗冲击能力也较强，还保证了系统的稳定性和高低温的适用性。However, due to the unstable chemical properties of the plastic material affected by the ambient temperature, its refractive index is weaker than that of the all-glass lens, resulting in poorer picture reproduction than the all-glass lens. In order to ensure the stability of the video lens under temperature changes, In this embodiment, the first convex-
具体地，在本实施例中，所述日夜共焦镜头的有效焦距为EFL，所述日夜共焦镜头的光学总长为TTL，其中，TTL/EFL≤5.95。采用不同透镜相互组合及合理分配光焦度，具有日夜共焦、大视角、高像素、以及非常好的消热差等良好性能。需要说明的是，有效焦距EFL是指所述第一透镜靠近物侧的侧面中心顶点与成像面在所述光轴上的距离，光学总长TTL即为所述第一透镜的物侧面中心顶点到所述成像面的距离。Specifically, in this embodiment, the effective focal length of the day and night confocal lens is EFL, and the total optical length of the day and night confocal lens is TTL, wherein TTL/EFL≤5.95. The combination of different lenses and the reasonable distribution of optical power have good performances such as day and night confocal, large viewing angle, high pixel, and very good adiabatic difference. It should be noted that the effective focal length EFL refers to the distance between the center vertex of the side surface of the first lens near the object side and the imaging surface on the optical axis, and the total optical length TTL is the distance from the center vertex of the object side surface of the first lens to The distance of the imaging plane.
具体地，在本实施例中，所述第一凸凹透镜1的直径为D1，所述日夜共焦镜头的光学总长为TTL，其中，D1/TTL＜0.55。当D1和TTL满足上述关系时，能够避免镜头的口径过大，满足最终产品的安装空间要求。Specifically, in this embodiment, the diameter of the first convex-
具体地，在本实施例中，所述日夜共焦镜头的像面直径IC满足：6mm≤IC≤7.2mm。Specifically, in this embodiment, the image plane diameter IC of the day and night confocal lens satisfies: 6mm≤IC≤7.2mm.
进一步地，在本实施例中，所述日夜共焦镜头自物侧到像侧依次还包括光阑7、保护玻璃8和感光芯片9，所述光阑7设于所述第三凸凹透镜3和所述第四双凸透镜4之间，所述保护玻璃8和所述感光芯片9设于所述第六双凸透镜6靠近像侧的一侧。因所述光阑7用以根据实际情况调节光通量，可以提高成像质量。所述保护玻璃8可为感光芯片9IMAGE提供有效保护，所述保护玻璃8可以设置为滤光片，滤光片可有效滤掉非工作波段的杂光，以减小光噪声，为后续的光电模块处理部分减小困难，从而提高成像质量。可以理解的是，所述感光芯片9朝向所述物侧的表面为成像面。Further, in this embodiment, the day and night confocal lens further includes an
具体地，所述成像面可以理解为所述感光芯片9朝向所述物侧的表面，即可以为CCD或者CMOS等摄像元件的表面，可以理解的是，携带被摄物体信息的光线能够依次经过所述第一凸凹透镜1、所述第二双凹透镜2、所述第三凸凹透镜3、所述第四双凸透镜4、所述第五双凹透镜5和所述第六双凸透镜6并最终成像于所述成像面上。Specifically, the imaging surface can be understood as the surface of the
具体地，在本实施例中，所述日夜共焦镜头的参数如下所示：Specifically, in this embodiment, the parameters of the day and night confocal lens are as follows:
本实施例的日夜共焦镜头的焦距f＝2.3mm，光圈值F＝2.06，像面直径6.9mm，对角视场角195°。The focal length of the day and night confocal lens of this embodiment is f=2.3 mm, the aperture value is F=2.06, the image plane diameter is 6.9 mm, and the diagonal field angle is 195°.
具体地，本实施例中，镜片的材质折射率，曲率半径，厚度间隔如下表1所示：Specifically, in this embodiment, the material refractive index, curvature radius, and thickness interval of the lens are shown in Table 1 below:
表1Table 1
具体地，在本实施例中，所述第一凸凹透镜1、所述第二双凹透镜2、所述第三凸凹透镜3、所述第五双凹透镜5和所述第六双凸透镜6均为非球面透镜，而非球面镜片的特点是：从镜片中心到镜片周边，曲率是连续变化的，与从镜片中心到镜片周边具有恒定曲率的球面镜片不同，非球面镜片具有更佳的曲率半径特性，具有改善歪曲像差及改善像散像差的优点，采用非球面镜片后，能够尽可能地消除在成像的时候出现的像差，从而提升镜头的成像质量，而采用玻璃材质的镜片，可减小温度对镜头光学性能的影响。Specifically, in this embodiment, the first convex-
进一步地，在本实施例中，非球面透镜的非球面表面形状满足以下条件：Further, in this embodiment, the shape of the aspheric surface of the aspheric lens satisfies the following conditions:
其中，c为半径所对应的曲率，y为径向坐标(其单位和透镜长度单位相同)，k为圆锥二次曲线系数，(当k系数小于-1时面形曲线为双曲线，当k系数等于-1时为抛物线，当k系数介于-1到0之间时为椭圆，当k系数等于0时为圆形，当k系数大于0时为扁圆形)，4阶项、6阶项、8阶项、10阶项、12阶项、14阶项、16阶项分别表示高次非球面系数(请参照下表2)，通过以上参数即可设定透镜物侧面和像侧面非球面的形状尺寸。Among them, c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic conic conic coefficient, (when the k coefficient is less than -1, the surface curve is a hyperbola, when k When the coefficient is equal to -1, it is a parabola; when the k coefficient is between -1 and 0, it is an ellipse; when the k coefficient is equal to 0, it is a circle; when the k coefficient is greater than 0, it is a flat circle); The order item, the 8th order item, the 10th order item, the 12th order item, the 14th order item, and the 16th order item represent the high-order aspheric coefficients respectively (please refer to the following table 2), and the lens object side and image side can be set through the above parameters The shape and size of an aspheric surface.
表2非球面镜片对应的圆锥系数和非球面系数：Table 2 Cone coefficient and aspheric coefficient corresponding to aspheric lens:
图2为本发明提供的一种日夜共焦镜头一实施例的球差曲线示意图，图3为本发明提供的一种日夜共焦镜头一实施例的光线光扇示意图。FIG. 2 is a schematic diagram of a spherical aberration curve of an embodiment of a day-night confocal lens provided by the present invention, and FIG. 3 is a schematic diagram of a light fan of an embodiment of a day-night confocal lens provided by the present invention.
图4为本发明提供的一种日夜共焦镜头一实施例的场区畸变/场曲示意图，其中，图中的S、T，分别为弧矢像侧、子午像侧所对应的像差。左边是场曲图，右边是畸变图。Fig. 4 is a schematic diagram of field distortion/field curvature of an embodiment of a day and night confocal lens provided by the present invention, wherein S and T in the figure are aberrations corresponding to the sagittal image side and the meridional image side, respectively. On the left is the field curvature plot and on the right is the distortion plot.
图5为本发明提供的一种日夜共焦镜头一实施例的MTF示意图，其中，横坐标为空间频率，纵坐标为对比度；TS Diff.Limit为子午和弧矢方向的衍射极限，TS 0.00(deg)表示在像面0.00视场上子午和弧矢方向的衍射曲线。Fig. 5 is the MTF schematic diagram of an embodiment of a kind of day and night confocal lens provided by the present invention, wherein, abscissa is spatial frequency, and ordinate is contrast; TS Diff.Limit is the diffraction limit of meridian and sagittal direction, TS 0.00( deg) represents the diffraction curves in the meridional and sagittal directions on the 0.00 field of view of the image plane.
由上述图可知，本实施例中的所述日夜共焦镜头的球面像差、场曲以及畸变均能够获得良好的校正。It can be seen from the above figure that the spherical aberration, field curvature and distortion of the day and night confocal lens in this embodiment can all be well corrected.
综上所述，所述日夜共焦镜头的光圈值F满足1.8≤F≤2.4，支持1/2.7英寸的像面，且在-40℃～+85℃的环境条件下不离焦，视场角可达190°±5％，镜头总长控制在13mm以内。In summary, the aperture value F of the day and night confocal lens satisfies 1.8≤F≤2.4, supports a 1/2.7-inch image plane, and does not defocus under the environmental conditions of -40°C to +85°C. It can reach 190°±5%, and the total length of the lens is controlled within 13mm.
本发明还提供一种成像装置，所述成像装置可以是相机、监控设备、摄像头等电子设备，所述成像装置包括上述技术方案所述的日夜共焦镜头，该日夜共焦镜头的具体结构参照上述实施例，由于本日夜共焦镜头的日夜共焦镜头采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。The present invention also provides an imaging device. The imaging device may be electronic equipment such as a camera, a monitoring device, and a camera. The imaging device includes the day and night confocal lens described in the above technical solution. For the specific structure of the day and night confocal lens, refer to In the above-mentioned embodiments, since the day-night confocal lens of this day-night confocal lens adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not repeat them one by one here. .
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.
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