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CN112630946B - An optical imaging lens for long-wave infrared - Google Patents

An optical imaging lens for long-wave infrared Download PDF

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CN112630946B
CN112630946B CN202011616757.5A CN202011616757A CN112630946B CN 112630946 B CN112630946 B CN 112630946B CN 202011616757 A CN202011616757 A CN 202011616757A CN 112630946 B CN112630946 B CN 112630946B
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lens
object side
image side
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optical imaging
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CN112630946A (en
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曹来书
张瑞翔
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Xiamen Leading Optics Co Ltd
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Xiamen Leading Optics Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/14Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
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  • Lenses (AREA)

Abstract

The invention relates to the technical field of lenses. The invention discloses an optical imaging lens for long-wave infrared, which is sequentially provided with four lenses from an object side to an image side along an optical axis; the first lens and the second lens are convex-concave lenses with negative refractive index; the third lens is a convex lens with positive refraction; the fourth lens is a concave-convex lens with positive refractive index; the object side surface and the image side surface of the first lens to the fourth lens are aspheric, and the first lens to the fourth lens are made of plastic materials. The invention has the advantages of long-wave infrared band design, high contrast, higher resolution, better temperature drift management and control, good ghost image optimization, jiao Jiaochang after, good suitability, large light transmission and high relative illumination.

Description

一种用于长波红外的光学成像镜头An optical imaging lens for long-wave infrared

技术领域Technical Field

本发明属于镜头技术领域,具体地涉及一种用于热成像的长波红外的光学成像镜头。The invention belongs to the technical field of lenses, and in particular relates to a long-wave infrared optical imaging lens for thermal imaging.

背景技术Background Art

随着科学技术的不断进步和社会的不断发展,近年来,光学成像镜头也得到了迅猛发展,被广泛地应用在智能手机、平板电脑、视频会议、车载监控、安防监控、智能交通系统、热成像等各个领域,因此,对于光学成像镜头的要求也越来越高。With the continuous advancement of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years and are widely used in various fields such as smart phones, tablets, video conferencing, vehicle monitoring, security monitoring, intelligent transportation systems, thermal imaging, etc. Therefore, the requirements for optical imaging lenses are getting higher and higher.

热成像是通过非接触探测红外能量(热量),并将其转换为电信号,进而在显示器上生成热图像和温度值。目前市面上的热成像监控镜头还存在许多不足之处,如图像对比度很低,分辨细节能力比较差;无热化性能差,不可在高低温情况下工作;杂散光鬼像严重,影响正常使用;采用短中波红外设计,对目标观察的清晰度和清楚度有待提高;镜头后焦普遍较短,不能同时匹配多个系统,适配性较差等,已无法满足用户日益提高的要求,急需进行改进。Thermal imaging is the process of non-contact detection of infrared energy (heat) and conversion of it into electrical signals, which then generates thermal images and temperature values on the display. Currently, thermal imaging surveillance lenses on the market still have many shortcomings, such as low image contrast and poor ability to resolve details; poor athermalization performance and inability to work under high and low temperature conditions; serious stray light ghost images that affect normal use; the use of short and medium-wave infrared design, the clarity and clarity of target observation needs to be improved; the lens back focus is generally short, and it cannot match multiple systems at the same time, and the adaptability is poor, etc., which can no longer meet the increasing requirements of users and urgently need to be improved.

发明内容Summary of the invention

本发明的目的在于提供一种用于长波红外的光学成像镜头用以解决上述存在的至少一个技术问题。The object of the present invention is to provide an optical imaging lens for long-wave infrared to solve at least one of the above-mentioned technical problems.

为实现上述目的,本发明采用的技术方案为:一种用于长波红外的光学成像镜头,从物侧至像侧沿一光轴依次包括第一透镜至第四透镜;第一透镜至第四透镜各自包括一朝向物侧且使成像光线通过的物侧面以及一朝向像侧且使成像光线通过的像侧面;To achieve the above object, the technical solution adopted by the present invention is: an optical imaging lens for long-wave infrared, comprising a first lens to a fourth lens in sequence along an optical axis from an object side to an image side; the first lens to the fourth lens each include an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through;

第一透镜具负屈光率,第一透镜的物侧面为凸面,第一透镜的像侧面为凹面;The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

第二透镜具负屈光率,第二透镜的物侧面为凸面,第二透镜的像侧面为凹面;The second lens has a negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

第三透镜具正屈光率,第三透镜的物侧面为凸面,第三透镜的像侧面为凸面;The third lens has a positive refractive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

第四透镜具正屈光率,第四透镜的物侧面为凹面,第四透镜的像侧面为凸面;The fourth lens element has a positive refractive power, the object side surface of the fourth lens element is a concave surface, and the image side surface of the fourth lens element is a convex surface;

第一透镜至第四透镜的物侧面和像侧面均为非球面,第一透镜至第四透镜均采用塑料材质制成;The object side surfaces and image side surfaces of the first to fourth lenses are all aspherical surfaces, and the first to fourth lenses are all made of plastic material;

该光学成像镜头具有屈光率的透镜只有上述的第一透镜至第四透镜。The optical imaging lens has only the first to fourth lenses with refractive power.

进一步的,该光学成像镜头还满足:nd1>2.4,其中,nd1为第一透镜的折射率。Furthermore, the optical imaging lens also satisfies: nd1>2.4, where nd1 is the refractive index of the first lens.

进一步的,该光学成像镜头还满足:nd4>2.4,其中,nd4为第四透镜的折射率。Furthermore, the optical imaging lens also satisfies: nd4>2.4, where nd4 is the refractive index of the fourth lens.

进一步的,该第二透镜采用溴化锌材料制成。Furthermore, the second lens is made of zinc bromide material.

进一步的,该光学成像镜头还满足:BFL/TTL>0.27,其中,BFL为第四透镜的像侧面至成像面在光轴上的距离,TTL为第一透镜的物侧面至成像面在光轴上的距离。Furthermore, the optical imaging lens also satisfies: BFL/TTL>0.27, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface on the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

更进一步的,该光学成像镜头还满足:BFL>10.0mm。Furthermore, the optical imaging lens also satisfies: BFL>10.0mm.

进一步的,该光学成像镜头还满足:0.42≤ALT/ALG≤0.5,其中,ALT为第一透镜至第四透镜在光轴上的四片透镜的厚度总和,ALG为第一透镜到成像面在光轴上的空气间隙总和。Furthermore, the optical imaging lens also satisfies: 0.42≤ALT/ALG≤0.5, wherein ALT is the sum of thicknesses of four lenses from the first lens to the fourth lens on the optical axis, and ALG is the sum of air gaps from the first lens to the imaging plane on the optical axis.

进一步的,还包括光阑,光阑设置在第一透镜与第二透镜之间。Furthermore, it also includes an aperture, which is arranged between the first lens and the second lens.

进一步的,该第一透镜至第四透镜的物侧面和像侧面均为高阶偶次非球面。Furthermore, the object side surfaces and image side surfaces of the first to fourth lenses are all high-order even-order aspheric surfaces.

本发明的有益技术效果:Beneficial technical effects of the present invention:

本发明采用四片透镜,并通过对各个透镜进行相应设计,具有长波红外波段设计,能够更清晰更清楚地观察目标;对比度很高,分辨率高;无热化管控较好,可在高低温环境下工作;鬼像优化较好,成像质量高;通光大,相对照度高且均匀度好;后焦较长,能够匹配多种结构、环境等应用,适配性好,有利于市场竞争的优点。The present invention adopts four lenses and has a long-wave infrared band design by designing each lens accordingly, so that the target can be observed more clearly; the contrast is very high and the resolution is high; the athermalization control is better and it can work in high and low temperature environments; the ghost image is better optimized and the imaging quality is high; the light transmission is large, the relative illumination is high and the uniformity is good; the back focus is long and it can match a variety of structures, environments and other applications, has good adaptability, and is conducive to the advantages of market competition.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简要介绍,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,对于本领域的普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

图1为本发明实施例一的结构示意图;FIG1 is a schematic diagram of the structure of Embodiment 1 of the present invention;

图2为本发明实施例一的红外8.00-12.00μm的MTF图;FIG2 is an MTF diagram of infrared 8.00-12.00 μm of Example 1 of the present invention;

图3为本发明实施例一的红外8.00-12.00μm在21lp/mm的离焦曲线图;FIG3 is a defocus curve diagram of infrared 8.00-12.00 μm at 21 lp/mm according to the first embodiment of the present invention;

图4为本发明实施例一的红外10.00μm的相对照度曲线图;FIG4 is a relative illumination curve diagram of infrared 10.00 μm according to the first embodiment of the present invention;

图5为本发明实施例一的场曲和畸变示意图;FIG5 is a schematic diagram of field curvature and distortion according to the first embodiment of the present invention;

图6为本发明实施例二的结构示意图;FIG6 is a schematic diagram of the structure of Embodiment 2 of the present invention;

图7为本发明实施例二的红外8.00-12.00μm的MTF图;FIG. 7 is an MTF diagram of infrared 8.00-12.00 μm of the second embodiment of the present invention;

图8为本发明实施例二的红外8.00-12.00μm在21lp/mm的离焦曲线图;FIG8 is a defocus curve diagram of infrared 8.00-12.00 μm at 21 lp/mm according to the second embodiment of the present invention;

图9为本发明实施例二的红外10.00μm的相对照度曲线图;FIG9 is a relative illumination curve diagram of infrared 10.00 μm according to the second embodiment of the present invention;

图10为本发明实施例二的场曲和畸变示意图;FIG10 is a schematic diagram of field curvature and distortion according to the second embodiment of the present invention;

图11为本发明实施例三的结构示意图;FIG11 is a schematic diagram of the structure of Embodiment 3 of the present invention;

图12为本发明实施例三的红外8.00-12.00μm的MTF图;FIG12 is an infrared 8.00-12.00 μm MTF diagram of Embodiment 3 of the present invention;

图13为本发明实施例三的红外8.00-12.00μm在21lp/mm的离焦曲线图;FIG13 is a defocus curve diagram of infrared 8.00-12.00 μm at 21 lp/mm according to the third embodiment of the present invention;

图14为本发明实施例三的红外10.00μm的相对照度曲线图;FIG14 is a relative illumination curve diagram of infrared 10.00 μm according to Embodiment 3 of the present invention;

图15为本发明实施例三的场曲和畸变示意图;FIG15 is a schematic diagram of field curvature and distortion according to Embodiment 3 of the present invention;

图16为本发明实施例四的结构示意图;FIG16 is a schematic diagram of the structure of Embodiment 4 of the present invention;

图17为本发明实施例四的红外8.00-12.00μm的MTF图;FIG17 is an MTF diagram of infrared 8.00-12.00 μm of Example 4 of the present invention;

图18为本发明实施例四的红外8.00-12.00μm在21lp/mm的离焦曲线图;FIG18 is a defocus curve diagram of infrared 8.00-12.00 μm at 21 lp/mm according to the fourth embodiment of the present invention;

图19为本发明实施例四的红外10.00μm的相对照度曲线图;FIG19 is a relative illumination curve diagram of infrared 10.00 μm according to the fourth embodiment of the present invention;

图20为本发明实施例四的场曲和畸变示意图;FIG20 is a schematic diagram of field curvature and distortion according to Embodiment 4 of the present invention;

图21为本发明实施例五的结构示意图;FIG21 is a schematic diagram of the structure of Embodiment 5 of the present invention;

图22为本发明实施例五的红外8.00-12.00μm的MTF图;FIG22 is an infrared 8.00-12.00 μm MTF diagram of Embodiment 5 of the present invention;

图23为本发明实施例五的红外8.00-12.00μm在21lp/mm的离焦曲线图;FIG23 is a defocus curve diagram of infrared 8.00-12.00 μm at 21 lp/mm according to Embodiment 5 of the present invention;

图24为本发明实施例五的红外10.00μm的相对照度曲线图;FIG24 is a relative illumination curve diagram of infrared 10.00 μm according to Embodiment 5 of the present invention;

图25为本发明实施例五的场曲和畸变示意图。FIG. 25 is a schematic diagram of field curvature and distortion of the fifth embodiment of the present invention.

具体实施方式DETAILED DESCRIPTION

为进一步说明各实施例,本发明提供有附图。这些附图为本发明揭露内容的一部分,其主要用以说明实施例,并可配合说明书的相关描述来解释实施例的运作原理。配合参考这些内容,本领域普通技术人员应能理解其他可能的实施方式以及本发明的优点。图中的组件并未按比例绘制,而类似的组件符号通常用来表示类似的组件。To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

现结合附图和具体实施方式对本发明进一步说明。The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

所说的「一透镜具有正屈光率(或负屈光率)」,是指所述透镜以高斯光学理论计算出来的近轴屈光率为正(或为负)。所说的「透镜的物侧面(或像侧面)」定义为成像光线通过透镜表面的特定范围。透镜的面形凹凸判断可依该领域中通常知识者的判断方式,即通过曲率半径(简写为R值)的正负号来判断透镜面形的凹凸。R值可常见被使用于光学设计软件中,例如Zemax或CodeV。R值亦常见于光学设计软件的透镜资料表(lens data sheet)中。以物侧面来说,当R值为正时,判定为物侧面为凸面;当R值为负时,判定物侧面为凹面。反之,以像侧面来说,当R值为正时,判定像侧面为凹面;当R值为负时,判定像侧面为凸面。The term "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The term "object side (or image side) of the lens" is defined as a specific range of the lens surface through which the imaging light passes. The concave and convex shape of the lens can be determined by the judgment method of the general knowledgeable person in this field, that is, the concave and convex shape of the lens surface can be determined by the positive and negative signs of the radius of curvature (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the object side, when the R value is positive, the object side is determined to be convex; when the R value is negative, the object side is determined to be concave. Conversely, for the image side, when the R value is positive, the image side is determined to be concave; when the R value is negative, the image side is determined to be convex.

本发明公开了一种用于长波红外的光学成像镜头,从物侧至像侧沿一光轴依次包括第一透镜至第四透镜;第一透镜至第四透镜各自包括一朝向物侧且使成像光线通过的物侧面以及一朝向像侧且使成像光线通过的像侧面。The present invention discloses an optical imaging lens for long-wave infrared, which comprises a first lens to a fourth lens in sequence along an optical axis from an object side to an image side; the first lens to the fourth lens each comprises an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through.

第一透镜具负屈光率,第一透镜的物侧面为凸面,第一透镜的像侧面为凹面。The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface.

第二透镜具负屈光率,第二透镜的物侧面为凸面,第二透镜的像侧面为凹面。The second lens has a negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface.

第三透镜具正屈光率,第三透镜的物侧面为凸面,第三透镜的像侧面为凸面。The third lens element has a positive refractive power, the object side surface of the third lens element is a convex surface, and the image side surface of the third lens element is a convex surface.

第四透镜具正屈光率,第四透镜的物侧面为凹面,第四透镜的像侧面为凸面。The fourth lens element has a positive refractive power, the object side surface of the fourth lens element is a concave surface, and the image side surface of the fourth lens element is a convex surface.

第一透镜至第四透镜的物侧面和像侧面均为非球面,第一透镜至第四透镜均采用塑料材质制成。The object side surfaces and image side surfaces of the first lens to the fourth lens are all aspherical surfaces, and the first lens to the fourth lens are all made of plastic material.

该光学成像镜头具有屈光率的透镜只有上述的第一透镜至第四透镜。本发明采用四片透镜,并通过对各个透镜进行相应设计,具有长波红外波段设计,能够更清晰更清楚地观察目标;对比度很高,分辨率高;无热化管控较好,可在高低温环境下工作;鬼像优化较好,成像质量高;通光大,相对照度高且均匀度好;后焦较长,能够匹配多种结构、环境等应用,适配性好,有利于市场竞争的优点。The optical imaging lens has only the first to fourth lenses mentioned above as lenses with refractive power. The present invention uses four lenses, and through corresponding design of each lens, has a long-wave infrared band design, can observe the target more clearly and clearly; high contrast, high resolution; better athermal control, can work in high and low temperature environments; better ghost image optimization, high imaging quality; large light transmission, high relative illumination and good uniformity; long back focus, can match a variety of structures, environments and other applications, good adaptability, and is conducive to market competition.

优选的,该光学成像镜头还满足:nd1>2.4,其中,nd1为第一透镜的折射率,更好地对镜头结构优化。Preferably, the optical imaging lens also satisfies: nd1>2.4, wherein nd1 is the refractive index of the first lens, so as to better optimize the lens structure.

优选的,该光学成像镜头还满足:nd4>2.4,其中,nd4为第四透镜的折射率,更好地对镜头结构优化。Preferably, the optical imaging lens also satisfies: nd4>2.4, wherein nd4 is the refractive index of the fourth lens, so as to better optimize the lens structure.

优选的,该第二透镜采用溴化锌材料制成,进一步管控温漂,实现无热化。Preferably, the second lens is made of zinc bromide material to further control temperature drift and achieve athermalization.

优选的,该光学成像镜头还满足:BFL/TTL>0.27,其中,BFL为第四透镜的像侧面至成像面在光轴上的距离,TTL为第一透镜的物侧面至成像面在光轴上的距离,进一步实现后焦较长。Preferably, the optical imaging lens further satisfies: BFL/TTL>0.27, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface on the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, thereby further achieving a longer back focus.

更优选的,该光学成像镜头还满足:BFL>10.0mm,保证较长后焦,提高适配性。More preferably, the optical imaging lens also satisfies: BFL>10.0mm, ensuring a longer back focus and improving adaptability.

优选的,该光学成像镜头还满足:0.42≤ALT/ALG≤0.5,其中,ALT为第一透镜至第四透镜在光轴上的四片透镜的厚度总和,ALG为第一透镜到成像面在光轴上的空气间隙总和,以进一步缩短光学成像镜头的系统长度,且易于加工制造,优化系统配置。Preferably, the optical imaging lens also satisfies: 0.42≤ALT/ALG≤0.5, wherein ALT is the sum of thicknesses of four lenses from the first lens to the fourth lens on the optical axis, and ALG is the sum of air gaps from the first lens to the imaging plane on the optical axis, so as to further shorten the system length of the optical imaging lens, facilitate processing and manufacturing, and optimize system configuration.

优选的,还包括光阑,光阑设置在第一透镜与第二透镜之间,进一步增大镜头的通光。Preferably, it also includes an aperture, which is arranged between the first lens and the second lens to further increase the light transmittance of the lens.

优选的,该第一透镜至第四透镜的物侧面和像侧面均为高阶偶次非球面,进一步优化像差、色差等,提高成像质量。Preferably, the object side surfaces and image side surfaces of the first to fourth lenses are all high-order even-order aspheric surfaces, which further optimize aberrations, chromatic aberrations, etc. and improve imaging quality.

下面将以具体实施例对本发明的用于长波红外的光学成像镜头进行详细说明。The optical imaging lens for long-wave infrared of the present invention will be described in detail with reference to specific embodiments below.

实施例一Embodiment 1

如图1所示,一种用于长波红外的光学成像镜头,从物侧A1至像侧A2沿一光轴I依次包括第一透镜1、光阑5、第二透镜2、第三透镜3、第四透镜4、保护玻璃6和成像面7;第一透镜1至第四透镜4各自包括一朝向物侧A1且使成像光线通过的物侧面以及一朝向像侧A2且使成像光线通过的像侧面。As shown in FIG. 1 , an optical imaging lens for long-wave infrared includes, from an object side A1 to an image side A2 along an optical axis I, a first lens 1, an aperture 5, a second lens 2, a third lens 3, a fourth lens 4, a protective glass 6, and an imaging surface 7; the first lens 1 to the fourth lens 4 each include an object-side surface facing the object side A1 and allowing imaging light to pass through, and an image-side surface facing the image side A2 and allowing imaging light to pass through.

第一透镜1具负屈光率,第一透镜1的物侧面11为凸面,第一透镜1的像侧面12为凹面。The first lens 1 has a negative refractive power, an object-side surface 11 of the first lens 1 is a convex surface, and an image-side surface 12 of the first lens 1 is a concave surface.

第二透镜2具负屈光率,第二透镜2的物侧面21为凸面,第二透镜2的像侧面22为凹面。The second lens element 2 has a negative refractive power, an object-side surface 21 of the second lens element 2 is a convex surface, and an image-side surface 22 of the second lens element 2 is a concave surface.

第三透镜3具正屈光率,第三透镜3的物侧面31为凸面,第三透镜3的像侧面32为凸面。The third lens element 3 has a positive refractive power, an object-side surface 31 of the third lens element 3 is a convex surface, and an image-side surface 32 of the third lens element 3 is a convex surface.

第四透镜4具正屈光率,第四透镜4的物侧面41为凹面,第四透镜4的像侧面42为凸面。The fourth lens element 4 has a positive refractive power. The object-side surface 41 of the fourth lens element 4 is a concave surface, and the image-side surface 42 of the fourth lens element 4 is a convex surface.

第一透镜1至第四透镜4的物侧面和像侧面均为非球面,第一透镜1至第四透镜4均采用塑料材质制成。The object side surfaces and image side surfaces of the first lens 1 to the fourth lens 4 are all aspherical surfaces, and the first lens 1 to the fourth lens 4 are all made of plastic material.

本具体实施例中,光阑5设置在第一透镜1与第二透镜2之间,但并不限于此,在其它实施例中,光阑5也可以设置在其它合适位置。In this specific embodiment, the aperture 5 is disposed between the first lens 1 and the second lens 2 , but it is not limited thereto. In other embodiments, the aperture 5 may also be disposed at other appropriate positions.

优选的,本具体实施例中,第二透镜2采用溴化锌材料制成,但并不以此为限。Preferably, in this specific embodiment, the second lens 2 is made of zinc bromide material, but not limited thereto.

本具体实施例的详细光学数据如表1-1所示。The detailed optical data of this specific embodiment are shown in Table 1-1.

表1-1实施例一的详细光学数据Table 1-1 Detailed optical data of Example 1

本具体实施例中,物侧面11、21、31、41和像侧面12、22、32、42依下列非球面曲线公式定义:In this specific embodiment, the object-side surfaces 11, 21, 31, 41 and the image-side surfaces 12, 22, 32, 42 are defined by the following aspheric curve formula:

其中:in:

r为光学表面上一点到光轴的距离。r is the distance from a point on the optical surface to the optical axis.

z为该点沿光轴方向的矢高。z is the vector height of the point along the optical axis.

c为该表面的曲率。c is the curvature of the surface.

K为该表面的二次曲面常数。K is the quadratic constant of the surface.

A4、A6、A8、A10、A12、A14、A16分别为:四阶、六阶、八阶、十阶、十二阶、十四阶、十六阶的非球面系数。A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16 are respectively the aspheric coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order.

各个非球面的参数详细数据请参考下表:Please refer to the following table for detailed parameter data of each aspheric surface:

表面surface 1111 1212 21twenty one 22twenty two 3131 3232 4141 4242 K=K= 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 -7.7470E-01-7.7470E-01 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A4A 4 = -5.6688E-05-5.6688E-05 -8.3268E-05-8.3268E-05 -2.5498E-04-2.5498E-04 -5.5952E-04-5.5952E-04 -1.2602E-04-1.2602E-04 2.3813E-052.3813E-05 4.0913E-054.0913E-05 6.4348E-056.4348E-05 A6A 6 = -8.1171E-07-8.1171E-07 -2.9460E-06-2.9460E-06 1.9731E-061.9731E-06 5.0470E-065.0470E-06 -3.5594E-07-3.5594E-07 -9.6128E-07-9.6128E-07 -1.3132E-06-1.3132E-06 -8.1608E-07-8.1608E-07 A8A 8 = 0.0000E+000.0000E+00 2.6262E-082.6262E-08 -2.5970E-08-2.5970E-08 -4.6725E-08-4.6725E-08 2.3593E-082.3593E-08 8.2099E-098.2099E-09 3.9793E-083.9793E-08 2.2149E-082.2149E-08 A10A 10 = 0.0000E+000.0000E+00 -9.1741E-10-9.1741E-10 1.2957E-101.2957E-10 1.3655E-101.3655E-10 -2.5259E-10-2.5259E-10 5.2674E-115.2674E-11 -1.9929E-10-1.9929E-10 7.4171E-117.4171E-11 A12A 12 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 5.3677E-135.3677E-13 -9.0193E-13-9.0193E-13 -7.3870E-13-7.3870E-13 -1.9776E-12-1.9776E-12 A14A 14 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A16A 16 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00

本具体实施例的相关条件表达式的数值请参考表6。Please refer to Table 6 for the numerical values of the relevant conditional expressions of this specific embodiment.

本具体实施例的MTF曲线图详见图2,离焦曲线图请参阅图3,可以看出长波红外设计,对比度高,分辨率高,成像质量好;相对照度图详见图4,可以看出相对照度较高,大于0.85,且视场范围相对照度均匀;场曲及畸变图详见图5的(A)和(B),可以看出场曲和畸变都矫正较好。The MTF curve diagram of this specific embodiment is shown in Figure 2, and the defocus curve diagram is shown in Figure 3. It can be seen that the long-wave infrared design has high contrast, high resolution, and good imaging quality; the relative illumination diagram is shown in Figure 4, and it can be seen that the relative illumination is relatively high, greater than 0.85, and the relative illumination of the field of view is uniform; the field curvature and distortion diagrams are shown in (A) and (B) of Figure 5, and it can be seen that both the field curvature and distortion are well corrected.

本具体实施可在高低温环境下使用。This specific implementation can be used in high and low temperature environments.

本具体实施例中,光学成像镜头的焦距f=7.16mm;光圈值FNO=1.0;视场角FOV=82.0°;第一透镜1的物侧面11至成像面7在光轴I上的距离TTL=39.93mm,第四透镜4的像侧面42至成像面7在光轴I上的距离BFL(光学后焦)=10.90mm。In this specific embodiment, the focal length of the optical imaging lens is f=7.16 mm; the aperture value FNO=1.0; the field of view angle FOV=82.0°; the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 7 on the optical axis I is 39.93 mm, and the distance BFL (optical back focus) from the image side surface 42 of the fourth lens 4 to the imaging surface 7 on the optical axis I is 10.90 mm.

实施例二Embodiment 2

如图6所示,本实施例与实施例一的各个透镜的面型凹凸和屈光率相同,仅各透镜表面的曲率半径、透镜厚度等光学参数有所不同。As shown in FIG. 6 , the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

本具体实施例的详细光学数据如表2-1所示。The detailed optical data of this specific embodiment are shown in Table 2-1.

表2-1实施例二的详细光学数据Table 2-1 Detailed optical data of Example 2

本具体实施例的各个非球面的参数详细数据请参考下表:For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

表面surface 1111 1212 21twenty one 22twenty two 3131 3232 4141 4242 K=K= 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 -7.8532E-01-7.8532E-01 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A4A 4 = -5.6133E-05-5.6133E-05 -7.8624E-05-7.8624E-05 -2.5500E-04-2.5500E-04 -5.5910E-04-5.5910E-04 -1.2638E-04-1.2638E-04 2.3850E-052.3850E-05 4.0585E-054.0585E-05 6.4653E-056.4653E-05 A6A 6 = -7.5438E-07-7.5438E-07 -2.8500E-06-2.8500E-06 1.9921E-061.9921E-06 5.0468E-065.0468E-06 -3.5643E-07-3.5643E-07 -9.6723E-07-9.6723E-07 -1.3066E-06-1.3066E-06 -8.2372E-07-8.2372E-07 A8A 8 = 0.0000E+000.0000E+00 2.6570E-082.6570E-08 -2.5859E-08-2.5859E-08 -4.6689E-08-4.6689E-08 2.3547E-082.3547E-08 8.1798E-098.1798E-09 3.9748E-083.9748E-08 2.2151E-082.2151E-08 A10A 10 = 0.0000E+000.0000E+00 -8.3618E-10-8.3618E-10 1.2612E-101.2612E-10 1.3600E-101.3600E-10 -2.5265E-10-2.5265E-10 5.2914E-115.2914E-11 -1.9992E-10-1.9992E-10 7.4044E-117.4044E-11 A12A 12 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 5.4937E-135.4937E-13 -8.9215E-13-8.9215E-13 -7.3354E-13-7.3354E-13 -1.9723E-12-1.9723E-12 A14A 14 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A16A 16 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00

本具体实施例的相关条件表达式的数值请参考表6。Please refer to Table 6 for the numerical values of the relevant conditional expressions of this specific embodiment.

本具体实施例的MTF曲线图详见图7,离焦曲线图请参阅图8,可以看出长波红外设计,对比度高,分辨率高,成像质量好;相对照度图详见图9,可以看出相对照度较高,大于0.85,且视场范围相对照度均匀;场曲及畸变图详见图10的(A)和(B),可以看出场曲和畸变都矫正较好。The MTF curve diagram of this specific embodiment is shown in Figure 7, and the defocus curve diagram is shown in Figure 8. It can be seen that the long-wave infrared design has high contrast, high resolution, and good imaging quality; the relative illumination diagram is shown in Figure 9, and it can be seen that the relative illumination is relatively high, greater than 0.85, and the relative illumination of the field of view is uniform; the field curvature and distortion diagrams are shown in (A) and (B) of Figure 10, and it can be seen that both the field curvature and distortion are well corrected.

本具体实施可在高低温环境下使用。This specific implementation can be used in high and low temperature environments.

本具体实施例中,光学成像镜头的焦距f=7.17mm;光圈值FNO=1.0;视场角FOV=82.0°;第一透镜1的物侧面11至成像面7在光轴I上的距离TTL=39.92mm,光学后焦BFL=10.91mm。In this specific embodiment, the focal length of the optical imaging lens is f=7.17 mm; the aperture value FNO=1.0; the field of view angle FOV=82.0°; the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 7 on the optical axis I is 39.92 mm, and the optical back focus BFL=10.91 mm.

实施例三Embodiment 3

如图11所示,本实施例与实施例一的各个透镜的面型凹凸和屈光率相同,仅各透镜表面的曲率半径、透镜厚度等光学参数有所不同。As shown in FIG. 11 , the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

本具体实施例的详细光学数据如表3-1所示。The detailed optical data of this specific embodiment are shown in Table 3-1.

表3-1实施例三的详细光学数据Table 3-1 Detailed optical data of Example 3

本具体实施例的各个非球面的参数详细数据请参考下表:Please refer to the following table for detailed parameter data of each aspheric surface in this specific embodiment:

表面surface 1111 1212 21twenty one 22twenty two 3131 3232 4141 4242 k=k= 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 -1.8789E+00-1.8789E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A4A 4 = -2.8337E-05-2.8337E-05 -1.4638E-05-1.4638E-05 -2.5587E-04-2.5587E-04 -5.4274E-04-5.4274E-04 -1.2481E-04-1.2481E-04 2.7652E-052.7652E-05 4.9655E-054.9655E-05 7.0157E-057.0157E-05 A6A 6 = -1.1026E-06-1.1026E-06 -4.0972E-06-4.0972E-06 2.4932E-062.4932E-06 5.0672E-065.0672E-06 -4.6734E-07-4.6734E-07 -8.6101E-07-8.6101E-07 -1.1282E-06-1.1282E-06 -6.4007E-07-6.4007E-07 A8A 8 = 0.0000E+000.0000E+00 4.1243E-084.1243E-08 -2.8536E-08-2.8536E-08 -4.7420E-08-4.7420E-08 2.2113E-082.2113E-08 6.3672E-096.3672E-09 3.8196E-083.8196E-08 2.1248E-082.1248E-08 A10A 10 = 0.0000E+000.0000E+00 -1.1428E-09-1.1428E-09 1.2942E-101.2942E-10 1.4538E-101.4538E-10 -2.5684E-10-2.5684E-10 4.1493E-114.1493E-11 -2.6380E-10-2.6380E-10 6.2485E-126.2485E-12 A12A 12 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 9.7302E-139.7302E-13 -4.8993E-13-4.8993E-13 -4.6881E-14-4.6881E-14 -1.3937E-12-1.3937E-12 A14A 14 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A16A 16 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00

本具体实施例的相关条件表达式的数值请参考表6。Please refer to Table 6 for the numerical values of the relevant conditional expressions of this specific embodiment.

本具体实施例的MTF曲线图详见图12,离焦曲线图请参阅图13,可以看出长波红外设计,对比度高,分辨率高,成像质量好;相对照度图详见图14,可以看出相对照度较高,大于0.85,且视场范围相对照度均匀;场曲及畸变图详见图15的(A)和(B),可以看出场曲和畸变都矫正较好。The MTF curve diagram of this specific embodiment is shown in Figure 12, and the defocus curve diagram is shown in Figure 13. It can be seen that the long-wave infrared design has high contrast, high resolution and good imaging quality; the relative illumination diagram is shown in Figure 14, and it can be seen that the relative illumination is relatively high, greater than 0.85, and the relative illumination of the field of view is uniform; the field curvature and distortion diagrams are shown in (A) and (B) of Figure 15, and it can be seen that both the field curvature and distortion are well corrected.

本具体实施可在高低温环境下使用。This specific implementation can be used in high and low temperature environments.

本具体实施例中,光学成像镜头的焦距f=7.16mm;光圈值FNO=1.0;视场角FOV=82.0°;第一透镜1的物侧面11至成像面7在光轴I上的距离TTL=39.92mm,光学后焦BFL=10.88mm。In this specific embodiment, the focal length of the optical imaging lens is f=7.16 mm; the aperture value FNO=1.0; the field of view angle FOV=82.0°; the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 7 on the optical axis I is 39.92 mm, and the optical back focus BFL=10.88 mm.

实施例四Embodiment 4

如图16所示,本实施例与实施例一的各个透镜的面型凹凸和屈光率相同,仅各透镜表面的曲率半径、透镜厚度等光学参数有所不同。As shown in FIG. 16 , the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

本具体实施例的详细光学数据如表4-1所示。The detailed optical data of this specific embodiment are shown in Table 4-1.

表4-1实施例四的详细光学数据Table 4-1 Detailed optical data of Example 4

本具体实施例的各个非球面的参数详细数据请参考下表:For detailed parameter data of each aspheric surface in this specific embodiment, please refer to the following table:

表面surface 1111 1212 21twenty one 22twenty two 3131 3232 4141 4242 K=K= 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 3.2659E-023.2659E-02 -1.6321E+00-1.6321E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A4A 4 = -2.1701E-05-2.1701E-05 -1.1116E-05-1.1116E-05 -2.6129E-04-2.6129E-04 -5.5543E-04-5.5543E-04 -1.3500E-04-1.3500E-04 2.6769E-052.6769E-05 5.4981E-055.4981E-05 7.5372E-057.5372E-05 A6A 6 = -9.7910E-07-9.7910E-07 -2.8902E-06-2.8902E-06 2.4561E-062.4561E-06 4.9595E-064.9595E-06 -5.6073E-07-5.6073E-07 -8.4159E-07-8.4159E-07 -9.8662E-07-9.8662E-07 -7.7747E-07-7.7747E-07 A8A 8 = 0.0000E+000.0000E+00 1.5737E-081.5737E-08 -3.0178E-08-3.0178E-08 -4.9891E-08-4.9891E-08 2.2668E-082.2668E-08 8.4420E-098.4420E-09 3.6654E-083.6654E-08 2.5445E-082.5445E-08 A10A 10 = 0.0000E+000.0000E+00 -6.5535E-10-6.5535E-10 1.6899E-101.6899E-10 1.8939E-101.8939E-10 -2.2469E-10-2.2469E-10 5.9423E-115.9423E-11 -2.1113E-10-2.1113E-10 4.4063E-134.4063E-13 A12A 12 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 9.0865E-139.0865E-13 -6.7594E-13-6.7594E-13 -7.5710E-13-7.5710E-13 -1.8262E-12-1.8262E-12 A14A 14 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A16A 16 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00

本具体实施例的相关条件表达式的数值请参考表6。Please refer to Table 6 for the numerical values of the relevant conditional expressions of this specific embodiment.

本具体实施例的MTF曲线图详见图17,离焦曲线图请参阅图18,可以看出长波红外设计,对比度高,分辨率高,成像质量好;相对照度图详见图19,可以看出相对照度较高,大于0.85,且视场范围相对照度均匀;场曲及畸变图详见图20的(A)和(B),可以看出场曲和畸变都矫正较好。The MTF curve diagram of this specific embodiment is shown in Figure 17, and the defocus curve diagram is shown in Figure 18. It can be seen that the long-wave infrared design has high contrast, high resolution and good imaging quality; the relative illumination diagram is shown in Figure 19, and it can be seen that the relative illumination is relatively high, greater than 0.85, and the relative illumination of the field of view is uniform; the field curvature and distortion diagrams are shown in (A) and (B) of Figure 20, and it can be seen that both the field curvature and distortion are well corrected.

本具体实施可在高低温环境下使用。This specific implementation can be used in high and low temperature environments.

本具体实施例中,光学成像镜头的焦距f=7.15mm;光圈值FNO=1.0;视场角FOV=82.0°;第一透镜1的物侧面11至成像面7在光轴I上的距离TTL=39.90mm,光学后焦BFL=10.89mm。In this specific embodiment, the focal length of the optical imaging lens is f=7.15 mm; the aperture value FNO=1.0; the field of view angle FOV=82.0°; the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 7 on the optical axis I is 39.90 mm, and the optical back focus BFL=10.89 mm.

实施例五Embodiment 5

如图21所示,本实施例与实施例一的各个透镜的面型凹凸和屈光率相同,仅各透镜表面的曲率半径、透镜厚度等光学参数有所不同。As shown in FIG. 21 , the surface profile and refractive power of each lens in this embodiment are the same as those in the first embodiment, and only the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

本具体实施例的详细光学数据如表5-1所示。The detailed optical data of this specific embodiment are shown in Table 5-1.

表5-1实施例五的详细光学数据Table 5-1 Detailed optical data of Example 5

本具体实施例的各个非球面的参数详细数据请参考下表:Please refer to the following table for detailed parameter data of each aspheric surface in this specific embodiment:

表面surface 1111 1212 21twenty one 22twenty two 3131 3232 4141 4242 K=K= 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 6.1032E-016.1032E-01 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A4A 4 = -4.4697E-05-4.4697E-05 -4.8779E-05-4.8779E-05 -3.1337E-04-3.1337E-04 -5.6864E-04-5.6864E-04 -8.4423E-05-8.4423E-05 1.9826E-051.9826E-05 1.4458E-051.4458E-05 4.1577E-054.1577E-05 A6A 6 = -9.5555E-07-9.5555E-07 -4.0258E-06-4.0258E-06 1.9570E-061.9570E-06 4.9957E-064.9957E-06 -2.8019E-07-2.8019E-07 -8.4778E-07-8.4778E-07 -2.0292E-06-2.0292E-06 -1.1921E-06-1.1921E-06 A8A 8 = 0.0000E+000.0000E+00 4.8006E-084.8006E-08 -1.9114E-08-1.9114E-08 -4.5651E-08-4.5651E-08 2.0630E-082.0630E-08 8.2031E-098.2031E-09 5.2355E-085.2355E-08 2.3949E-082.3949E-08 A10A 10 = 0.0000E+000.0000E+00 -1.2302E-09-1.2302E-09 9.0767E-119.0767E-11 1.0251E-101.0251E-10 -2.9967E-10-2.9967E-10 2.5332E-112.5332E-11 -2.3302E-10-2.3302E-10 1.2183E-101.2183E-10 A12A 12 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 1.2272E-121.2272E-12 -4.6352E-13-4.6352E-13 -7.0247E-13-7.0247E-13 -2.1041E-12-2.1041E-12 A14A 14 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 A16A 16 = 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00 0.0000E+000.0000E+00

本具体实施例的相关条件表达式的数值请参考表6。Please refer to Table 6 for the numerical values of the relevant conditional expressions of this specific embodiment.

本具体实施例的MTF曲线图详见图22,离焦曲线图请参阅图23,可以看出长波红外设计,对比度高,分辨率高,成像质量好;相对照度图详见图24,可以看出相对照度较高,大于0.85,且视场范围相对照度均匀;场曲及畸变图详见图25的(A)和(B),可以看出场曲和畸变都矫正较好。The MTF curve diagram of this specific embodiment is shown in Figure 22, and the defocus curve diagram is shown in Figure 23. It can be seen that the long-wave infrared design has high contrast, high resolution and good imaging quality; the relative illumination diagram is shown in Figure 24, and it can be seen that the relative illumination is relatively high, greater than 0.85, and the relative illumination of the field of view is uniform; the field curvature and distortion diagrams are shown in (A) and (B) of Figure 25, and it can be seen that both the field curvature and distortion are well corrected.

本具体实施可在高低温环境下使用。This specific implementation can be used in high and low temperature environments.

本具体实施例中,光学成像镜头的焦距f=7.17mm;光圈值FNO=1.0;视场角FOV=82.0°;第一透镜1的物侧面11至成像面7在光轴I上的距离TTL=39.93mm,光学后焦BFL=10.90mm。In this specific embodiment, the focal length of the optical imaging lens is f=7.17 mm; the aperture value FNO=1.0; the field of view angle FOV=82.0°; the distance TTL from the object side surface 11 of the first lens 1 to the imaging surface 7 on the optical axis I is 39.93 mm, and the optical back focus BFL=10.90 mm.

表6本发明五个实施例的相关重要参数的数值Table 6 Numerical values of relevant important parameters of five embodiments of the present invention

实施例一Embodiment 1 实施例二Embodiment 2 实施例三Embodiment 3 实施例四Embodiment 4 实施例五Embodiment 5 BFLBFL 10.9010.90 10.9110.91 10.8810.88 10.8910.89 10.9010.90 TTLTTL 39.9339.93 39.9239.92 39.9239.92 39.9039.90 39.9339.93 BFL/TTLBFL/TTL 0.270.27 0.270.27 0.270.27 0.270.27 0.270.27 ALTALT 13.2113.21 13.2313.23 13.0113.01 13.2213.22 11.8311.83 ALGALG 26.7226.72 26.6926.69 26.9126.91 26.6826.68 28.1028.10 ALT/ALGALT/ALG 0.490.49 0.500.50 0.480.48 0.500.50 0.420.42

尽管结合优选实施方案具体展示和介绍了本发明,但所属领域的技术人员应该明白,在不脱离所附权利要求书所限定的本发明的精神和范围内,在形式上和细节上可以对本发明做出各种变化,均为本发明的保护范围。Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims (7)

1. An optical imaging lens for long-wave infrared, which is characterized in that: in order from the object side to the image side along an optical axis comprises a first lens to a fourth lens; the first lens element to the fourth lens element each comprise an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;
The first lens has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has positive refractive index, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
The fourth lens has positive refractive index, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
The object side surface and the image side surface of the first lens to the fourth lens are aspheric, and the first lens to the fourth lens are made of plastic materials;
The optical imaging lens has the first lens to the fourth lens, and the optical imaging lens meets the following requirements: nd1>2.4, and BFL/TTL >0.27, where nd1 is the refractive index of the first lens element, BFL is the distance from the image side surface of the fourth lens element to the imaging surface on the optical axis, and TTL is the distance from the object side surface of the first lens element to the imaging surface on the optical axis.
2. The optical imaging lens for long-wave infrared according to claim 1, further satisfying: nd4>2.4, wherein nd4 is the refractive index of the fourth lens.
3. The optical imaging lens for long-wave infrared according to claim 1, wherein: the second lens is made of zinc bromide material.
4. The optical imaging lens for long-wave infrared according to claim 1, further satisfying: BFL >10.0mm.
5. The optical imaging lens for long-wave infrared according to claim 1, further satisfying: ALT/ALG is not less than 0.42 and not more than 0.5, wherein ALT is the sum of thicknesses of four lenses of the first lens to the fourth lens on the optical axis, and ALG is the sum of air gaps of the first lens to the imaging surface on the optical axis.
6. The optical imaging lens for long-wave infrared according to claim 1, wherein: the lens assembly further comprises a diaphragm, and the diaphragm is arranged between the first lens and the second lens.
7. The optical imaging lens for long-wave infrared according to claim 1, wherein: the object side surface and the image side surface of the first lens to the fourth lens are both high-order even-order aspheric surfaces.
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