WO2012174786A1 - 一种近红外镜头 - Google Patents

一种近红外镜头 Download PDF

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Publication number
WO2012174786A1
WO2012174786A1 PCT/CN2011/078488 CN2011078488W WO2012174786A1 WO 2012174786 A1 WO2012174786 A1 WO 2012174786A1 CN 2011078488 W CN2011078488 W CN 2011078488W WO 2012174786 A1 WO2012174786 A1 WO 2012174786A1
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Prior art keywords
lens
infrared
lenses
focal length
infrared lens
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PCT/CN2011/078488
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English (en)
French (fr)
Inventor
黄林
戴付建
Original Assignee
浙江舜宇光学有限公司
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Priority claimed from CN2011202182398U external-priority patent/CN202093231U/zh
Priority claimed from CN 201110173404 external-priority patent/CN102213821B/zh
Application filed by 浙江舜宇光学有限公司 filed Critical 浙江舜宇光学有限公司
Priority to US13/501,053 priority Critical patent/US9229201B2/en
Publication of WO2012174786A1 publication Critical patent/WO2012174786A1/zh

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Classifications

    • 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
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/008Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/04Reversed telephoto objectives
    • 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

Definitions

  • the invention relates to a near-infrared lens, in particular to a near-infrared lens with a large aperture, a wide angle and a small distortion composed of four groups of lenses. Background technique
  • the optical lenses used in existing digital products generally use ordinary optical lenses, and the viewing angle is small, and the image quality is not high.
  • the wide-angle lens can overcome this shortcoming, but the biggest problem with the ordinary wide-angle lens is that the image of the object will be distorted after the optical action of the lens. Since only the spherical glass was used in the past, in order to correct the distortion of the image ( Or the barrel deformation, that is, the closer the image is to the edge, the more the image expands and the curve bends into an arc.) It is necessary to install multiple crescent-shaped negative lenses or crescent-shaped positive lenses at the front end of the lens. Eliminate this difference. Ordinary wide-angle lens at the lens angle
  • the lens may not provide better image quality.
  • many patents provide a lens composed of four lenses, for example, in the patent numbers CN200610138436. 2, CN200710111925. 3, CN200710201438. 6, CN200810305113. 7, CN200910302836. 6 and the like. These lenses use a structure in which the first lens is a positive power lens, and the other lenses are different in design.
  • the technical object of the present invention is to overcome the shortcomings of the near-infrared lens in the prior art, and to provide a lens structure having a single tube, which can realize a near-infrared lens with a large aperture, a wide angle, and a small distortion.
  • a near-infrared lens comprising four groups of lenses from the object side to the image side along the optical axis, the first lens being a meniscus lens of negative power, the convex surface facing the object side, using an aspheric surface; the second lens is a meniscus lens with positive or negative power, convex surface facing the image side; the third lens is a biconvex, flat convex or meniscus lens with positive power, flat convex or meniscus, convex surface facing the object side The fourth lens is a positive power lens, using an aspheric surface.
  • the near-infrared lens satisfies the following relationship:
  • is the focal length of the first lens and f is the focal length of the entire system
  • I f 1 1 is the absolute value of the focal length of the first lens
  • I f 2 I is the absolute value of the focal length of the second lens
  • f 3 is the focal length of the third lens
  • f4 is the focal length of the fourth lens
  • f 3 is the focal length of the third lens and f is the focal length of the entire system.
  • the optical performance of the lens can be significantly improved, such as large aperture, wide angle, small distortion, and the like.
  • the near-infrared lens further includes an aperture, the aperture being located between the second lens and the third lens.
  • the near-infrared lens satisfies the following relationship:
  • dnl /dt is the relative temperature change of the refractive index of the first lens
  • dn2/dt is the relative temperature change of the refractive index of the second lens
  • dn3/dt is the relative change in temperature of the refractive index of the third lens.
  • the third lens is a glass lens
  • the first, second and fourth lenses are plastic lenses.
  • the near-infrared lens further includes a filter disposed between the second lens and the third lens.
  • each lens is fixed.
  • the invention adopts the lens combination of different shapes and realizes the functions of large aperture, wide angle and small distortion by using the power distribution, and can achieve FN0 ⁇ 1, the field of view is >9 Q degree, and the distortion is ⁇ 5%. Further, by limiting the focal length relationship of each of the lenses to a specific range, optical performance can be further improved. Further, by limiting the relationship of dn/dt, the athermalization effect can be effectively achieved.
  • FIG. 1 is a schematic view showing a specific structure of a first embodiment of a near-infrared lens according to the present invention
  • Figure 2 is a diagram showing the axial chromatic aberration of the near-infrared lens at 25 °C in the first embodiment of the present invention
  • Embodiment 3 is an astigmatism diagram of a near-infrared lens at 25 ° C in Embodiment 1 of the present invention
  • Figure 5 is a chromatic aberration diagram of magnification of a near-infrared lens at 25 °C in Embodiment 1 of the present invention.
  • Embodiment 6 is an FFT MTF diagram of a near-infrared lens at 25 ° C in Embodiment 1 of the present invention.
  • Embodiment 8 is an FFT MTF diagram of a near-infrared lens at 50 ° C in Embodiment 1 of the present invention.
  • Figure 9 is a diagram showing the axial chromatic aberration of the near-infrared lens at 25 °C in Embodiment 2 of the present invention.
  • Figure 10 is an astigmatism diagram of a near-infrared lens at 25 °C in Embodiment 2 of the present invention.
  • Figure 11 is a distortion diagram of the near-infrared lens at 25 °C in Embodiment 2 of the present invention.
  • Figure 12 is a chromatic aberration diagram of magnification of a near-infrared lens at 25 °C in Embodiment 2 of the present invention.
  • Figure 13 is an FFT MTF diagram of the near-infrared lens at 25 °C in Embodiment 2 of the present invention.
  • Figure 14 is an FFT MTF diagram of a near-infrared lens at 5 °C in Embodiment 2 of the present invention.
  • Fig. 1 is a schematic view showing the specific structure of a first embodiment of a near-infrared lens according to the present invention.
  • the near-infrared lens of the present invention is mainly composed of four groups of lenses, and includes four groups of lenses in order from the object side to the image side along the optical axis, and the first lens E1 is a meniscus lens with a negative refractive power, and the convex surface is oriented.
  • the object side adopts an aspherical surface;
  • the second lens E2 is a meniscus lens with positive refractive power, and the convex surface faces the image side;
  • the third lens E3 is a plano-convex lens with positive refractive power, the convex surface faces the object side;
  • the fourth lens E4 is The positive power lens is aspherical.
  • a filter E5 and a diaphragm E6 are further provided between the second lens E2 and the third lens E3.
  • the filter E5 and the aperture E6 By relying on the design of the filter E5 and the aperture E6, the incident angle of the chief ray of the entire lens can be reduced, thereby easily eliminating various brightness problems caused by the wavelength shift of the light, and improving the optical quality of the overall imaging.
  • the positions of the above lenses are fixed, and the lenses are not movable.
  • the third lens E3 is a glass lens
  • the first lens El, the second lens E2 and the fourth lens E4 are all plastic lenses.
  • the heat dissipation difference can be overcome by using a glass-plastic mixed structure.
  • the lens needs to satisfy the following expression:
  • dnl/dt is the relative temperature change of the refractive index of the first lens El
  • dn2/dt is the relative temperature change of the refractive index of the second lens E2;
  • dn3/dt is the relative temperature change of the refractive index of the third lens E3.
  • the focal length of each lens is as follows:
  • the mirror surface of the first lens E1 is S1, S2, the mirror surface of the second lens E2 is S3, S4, and the mirror surface of the filter E5 is S5, S6, the surface of the aperture It is S7, the mirror surface of the third lens E3 is S8, S9, the mirror surface of the fourth lens E4 is S10, S11, the mirror surface of the chip protection glass E7 is S12, S13, and the surface of the image surface is S14.
  • Table 1 and Table 2 list the relevant parameters of the lens of the specific embodiment 1, including the surface type of the lens surface, the radius of curvature, and the thickness, material, effective diameter and conical coefficient of each lens.
  • 2 to 8 are graphs showing optical performance corresponding to the specific embodiment 1.
  • 2 to FIG. 5 respectively characterize the chromatic aberration, astigmatism, distortion, and chromatic aberration of magnification of the near-infrared lens of the present invention.
  • the near-infrared lens of Embodiment 1 of the present invention is in chromatic aberration and astigmatism.
  • the distortion and other aspects have been significantly improved, and the image quality has been greatly improved.
  • 6 to 8 are FFT MTF diagrams corresponding to the specific embodiment 1, for reflecting the athermal difference characteristics. As is clear from Figs. 6 to 8, the near-infrared mirror of the first embodiment has good athermalization performance.
  • the near-infrared lens of Embodiment 2 will be further described below.
  • the near-infrared lens of the second embodiment also employs four sets of lenses.
  • the diopter, configuration, and layout of each lens are the same as those of the near-infrared lens of the first embodiment, but the specific parameters of the lenses are completely different.
  • the focal lengths of the lenses of the near-infrared lens of Example 2 are as follows:
  • the near-infrared lens of the second embodiment also adopts a glass-plastic mixed structure to overcome the heat dissipation difference. And the lens satisfies the following expression:
  • Table 3 and Table 4 list the relevant parameters of the lens of the specific embodiment 2, including the surface type of the lens surface, the radius of curvature, and the thickness, material, effective diameter and conical coefficient of each lens.
  • Table 4 is the aspherical high order term coefficients A4, A6, A8, A1 0, A12, A14, and A16 of the aspherical lens of Example 2.
  • 9 to 15 are graphs showing optical performance corresponding to Specific Embodiment 2.
  • 9 to 12 respectively characterize the chromatic aberration, astigmatism, distortion, and chromatic aberration of magnification of the near-infrared lens of Embodiment 2, and it can be clearly seen from the figure that the near-infrared lens of Embodiment 2 of the present invention is in chromatic aberration, image The dispersion and distortion have been significantly improved, and the image quality has been greatly improved.
  • FIG. 13 to FIG. 15 are FFT MTF diagrams corresponding to the specific embodiment 2 for reflecting the athermal difference characteristic. As is clear from Fig. 13 to Fig. 15, the near-infrared lens of the second embodiment has good athermalization performance.
  • the data in the graphs of the above optical properties indicate that the near-infrared lens of the present invention has a good optical effect, and realizes a large aperture, a wide angle, a small distortion, and an athermal difference.

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

Abstract

一种近红外镜头,沿光轴从物方到像方依次包括四组镜片,第一镜片(E1)为负光焦度的弯月形镜片,凸面朝向物方,采用非球面;第二镜片(E2)为正或负光焦度的弯月形镜片,凸面朝向像方;第三镜片(E3)为正光焦度的双凸形、平凸形或弯月形镜片,平凸或弯月形时,凸面朝向物方;第四镜片(E4)为正光焦度的镜片,采用非球面。该近红外镜头能够保证在大孔径、大视场角度下满足成像品质,并且畸变小。

Description

一种近红外镜头
技术领域
本发明涉及一种近红外镜头, 具体的说是涉及一种由四组镜片组成的大孔 径、 广角、 小畸变的近红外镜头。 背景技术
现有的数码产品用的光学镜头一般都是采用普通的光学镜头, 视角小, 成 像质量不高。 采用广角镜头可以克服这种缺点, 但普通的广角镜头存在的最大 问题是物体的成像在经镜头的光学作用后, 会有影像歪曲的现象, 由于过去仅 有球面玻璃, 为了补正成像的歪曲收差 (或称为桶装变形, 即是成像中越接近 边缘,影像越会有扩张及直线弯曲成弧线的现象), 需要加装多片新月形负镜片 或新月形正镜片在镜头的前端才能消除这种收差。 普通的广角镜头在镜头视角
80度时, 需要 8至 10片镜片, 在镜头视角 100度以上, 需要 10至 12片以上, 造成镜头太长且重量增加。 可见普通的广角镜头, 尤其是近红外广角镜头, 结 构复杂, 另外还存在着相对孔径一般都比较小的现象。
随着光学塑胶材料的进步及非球面镜片的制造技术普及化, 便有许多小型 且轻量化的镜头出现。 尤其是使用非球面镜片之后, 镜头视角 80度时, 只需要 3至 4片镜片, 镜头视角 100度时, 仅需要 4至 5片镜片, 镜头视角 120度以 上时, 仅需要 5至 6片镜片, 可见光学镜头正在向小型且轻量化发展。
如果镜头的镜片数太少, 恐无法提供较佳成像质量。 为了保证成像质量, 艮多专利都提供了 4 片镜片组成的镜头, 比如在专利号 CN200610138436. 2、 CN200710111925. 3、 CN200710201438. 6、 CN200810305113. 7、 CN200910302836. 6 等中。 这些镜头都采用了第一镜片为正光焦度的镜片的结构, 其他镜片在设计 上各有不同。
但是可以发现, 这些镜头在广角方面效果还相对较差, 并且图像失真的问 题也无法克服。 并且, 这些专利并没有考虑到温度变化对镜头的影响。 因为现 代光学仪器通常要求能在一个较宽的环境温度范围内具有稳定的性能,需要对 系统进行消热差设计。光学系统的消热差设计是通过一定的补偿技术,使光学系 统在一个较宽的温度范围内保持成像质量不变,通常有三种方法:机械主动式、 机械被动式和光学被动式。 作为光学仪器中最常见的镜头, 为了实现消热差, 一般也是从以上三种方法入手, 但这些方法使得镜头结构更加复杂, 造成成本 升高、 镜头体积变大等问题, 对便携式的镜头的要求是不符合的。 发明内容
鉴于上述问题,本发明的技术目的在于克服现有技术中近红外镜头的缺点, 提供一种具有筒单的镜片结构, 能实现大孔径、 广角、 小畸变的近红外镜头。
为了实现上述技术目的, 本发明通过下面的技术方案实现:
一种近红外镜头, 该镜头沿光轴从物方到像方依次包括四组镜片, 第一镜 片为负光焦度的弯月形镜片, 凸面朝向物方, 采用非球面; 第二镜片为正或负 光焦度的弯月形镜片, 凸面朝向像方; 第三镜片为正光焦度的双凸形、 平凸形 或弯月形镜片, 平凸或弯月形时, 凸面朝向物方; 第四镜片为正光焦度的镜片, 采用非球面。
优选, 所述近红外镜头满足下述的关系式:
① -0. 5<f/f l<-0. 2
其中 Π为第一镜片的焦距, f 为整个系统的焦距;
② | f2 | > | f l |
其中 I f 1 1为第一镜片的焦距的绝对值, I f 2 I为第二镜片的焦距的绝对值;
③ f4>f 3
其中 f 3为第三镜片的焦距, f4为第四镜片的焦距;
④ 0. 2<f/f 3<0. 6
其中 f 3为第三镜片的焦距, f 为整个系统的焦距。
通过确定上述焦距关系, 可以明显改善镜头的光学性能, 诸如大孔径、 广 角、 小畸变等。
优选, 所述近红外镜头还包括光阑, 所述光阑位于所述第二镜片和第三镜 片之间。
进一步, 所述近红外镜头满足下述的关系式:
0<dn3/dt<lE-05, -lE-3<dnl/dt<-5E-5, -lE-3<dn2/dt<-5E-5 其中 dnl /dt为第一个镜片的折射率相对的温度变化量;
其中 dn2/dt为第二个镜片的折射率相对的温度变化量;
其中 dn3/dt为第三个镜片的折射率相对的温度变化量。
优选, 所述第三镜片为玻璃镜片, 所述第一、 二和四镜片为塑料镜片。 优选, 所述近红外镜头还包括滤光片, 所述滤光片设置在第二镜片和第三 镜片之间。
此外, 各镜片的位置固定。
本发明采用不同外形的镜片组合以及利用光焦度分配实现了大孔径、广角、 小畸变的功能, 可以达到 FN0<1 , 视场角 >9 Q度, 畸变 <5%。 进而, 通过对各镜 片的焦距关系限制在特定范围, 可以使光学性能更加优异。 进一步地, 通过限 制 dn/dt的关系, 可以有效地实现消热差效果。 附图说明
通过下面结合附图对其示例性实施例进行的描述, 本发明上述特征和优点 将会变得更加清楚和容易理解。
图 1是本发明所涉及的近红外镜头的实施例 1具体结构示意图;
图 2是本发明实施例 1中近红外镜头 25 °C时的轴上色差图;
图 3是本发明实施例 1中近红外镜头 25 °C时的像散图;
图 4是本发明实施例 1中近红外镜头 25 °C时的畸变图;
图 5是本发明实施例 1中近红外镜头 25 °C时的倍率色差图;
图 6是本发明实施例 1中近红外镜头 25 °C时的 FFT MTF图;
图 7是本发明实施例 1中近红外镜头 5 °C时的 FFT MTF图;
图 8是本发明实施例 1中近红外镜头 50 °C时的 FFT MTF图;
图 9是本发明实施例 2中近红外镜头 25 °C时的轴上色差图;
图 10是本发明实施例 2中近红外镜头 25 °C时的像散图;
图 11是本发明实施例 2中近红外镜头 25 °C时的畸变图;
图 12是本发明实施例 2中近红外镜头 25 °C时的倍率色差图;
图 1 3是本发明实施例 2中近红外镜头 25 °C时的 FFT MTF图;
图 14是本发明实施例 2中近红外镜头 5 °C时的 FFT MTF图;
图 15是本发明实施例 2中近红外镜头 50 °C时的 FFT MTF图; 具体实施方式
下面结合附图对本发明作进一步详细的描述。
图 1是本发明所涉及的近红外镜头的实施例 1的具体结构示意图。
如图所示, 本发明的近红外镜头主要由四组镜片组成, 沿光轴从物方到像 方依次包括四组镜片, 第一镜片 E1为负光焦度的弯月形镜片, 凸面朝向物方, 采用非球面; 第二镜片 E2为正光焦度的弯月形镜片, 凸面朝向像方; 第三镜片 E3为正光焦度的平凸形镜片, 凸面朝向物方; 第四镜片 E4为正光焦度的镜片, 采用非球面。
此外, 在第二镜片 E2和第三镜片 E3之间, 还设置有滤光片 E5和光阑 E6。 依靠滤光片 E5以及光阑 E6的设计, 能够降低整体镜片的主光线的入射角度, 从而比较容易地消除了因为光线的波长偏移而造成的各种亮度问题, 提高整体 成像的光学品质。 并且, 所述以上各镜片的位置是固定的, 各镜片不可移动。
进一步地, 所述第三镜片 E3为玻璃镜片, 所述第一镜片 El、 第二镜片 E2 和第四镜片 E4均为塑料镜片。 通过采用玻塑混合的结构, 可以克服消热差。 并 且所述镜片需要满足下列的表达式:
dnl/dt = dn2/dt = -1.022E-4, dn3/dt = 4.65E-6
其中 dnl/dt为第一镜片 El的折射率相对的温度变化量;
其中 dn2/dt为第二镜片 E2的折射率相对的温度变化量;
其中 dn3/dt为第三镜片 E3的折射率相对的温度变化量。 下面参照图表对 上述发明的技术效果进行描述, 以使得本发明的上述特征和优点更加清楚和容 易理解。
在具体实施例 1中, 各个镜片的焦距如下:
fl = -9.06; f2 = 31.46; f3 = 8.69; f4 = 11.21; f = 3.03。
沿光轴平行从物方将各个部件依次编号, 第一镜片 E1 的镜面为 Sl、 S2, 第二镜片 E2的镜面为 S3、 S4,滤光片 E5的镜面为 S5、 S6, 光阑的面是 S7, 第 三镜片 E3的镜面是 S8、 S9,第四镜片 E4的镜面是 S10、 S11,芯片保护玻璃 E7 的镜面是 S12、 S13,像面的面为 S14。
表 1、 表 2列出的是具体实施例 1的镜片的相关参数, 包含镜片面的表面 类型、 曲率半径, 还有各镜片的厚度、 材料、 有效径以及圓锥系数。
系统参数: 1/3' ' 感光器件 光圏值 1.0 :/:/ O 8i/-0i>l£ 98/-SJoiAV
Figure imgf000007_0002
Figure imgf000007_0001
Figure imgf000007_0003
图 2至图 8为具体实施例 1相对应的光学性能曲线图。 图 2至图 5分别表 征了本发明的近红外镜头的色差、 像散、 畸变和倍率色差等特征, 从图中可以 清楚地看出本发明的实施例 1的近红外镜头在色差、 像散和畸变等方面得到明 显改善, 成像品质大大提高。 图 6至图 8为具体实施例 1相对应的 FFT MTF图, 用以反映消热差特征。 从图 6至图 8中可以清楚看出, 本实施例 1的近红外镜 头具有良好的消热差性能。
下面进一步地介绍实施例 2的近红外镜头。 实施例 2的近红外镜头同样采 用了四组镜片, 各镜片的屈光度、 构型、 布局与实施例 1的近红外镜头相同, 但各镜片的具体参数是完全不同的。
实施例 2的近红外镜头的各镜片的焦距如下:
f l = -6. 80 ; f 2 = 23. 53 ; f 3 = 6. 53; f4 = 8. 47 ; f = 1. 11。
实施例 2的近红外镜头同样采用玻塑混合的结构, 实现克服消热差。 并且 所述镜片满足下列的表达式:
dnl /dt = dn2/dt = -1. 022E-4 , dn3/d t = 4. 65E-6
表 3、 表 4列出的是具体实施例 2的镜片的相关参数, 包含镜片面的表面 类型、 曲率半径, 还有各镜片的厚度、 材料、 有效径以及圓锥系数。
系统参数: 1 /4 ' ' 感光器件 光圏值 1. 0
表 3
面序号 S 表面类型 曲率半径 R 厚度 D 材料 有效径 D 圓锥系数 K 物面 球面 无穷 1500 3115.62
S1 非球面 8.5032 1.1252 1. 531 1 56. 0 9.84 0.0828
S2 非球面 2.3964 4.7657 6.32 -0.6341
S3 非球面 -4.3405 3.4350 1. 531 1 56. 0 5.20 -0.3716
S4 非球面 -4.0844 0.0687 6.61 -0.4228
S5 球面 无穷 0.0638 5.79
S6 球面 无穷 0.7 1. 517 1 64. 2 5.90
S7 球面 无穷 0.0993 6.13
S8 球面 5.3498 2.7057 1. 804 1 46. 6 7.00
S9 球面 -108.9019 2.3504 7.00 S10 非球面 -37.1690 1.3898 1. 585 1 29. 9 5.24 166.7381
Sl l 非球面 -4.3382 0.0750 5.51 -5.7898
S12 球面 无穷 0.75 1. 517 1 64. 2 5.21
S13 球面 无穷 1.4021 5.05
S14 球面 无穷 4.54
表 4是实施例 2的非球面镜片的非球面高次项系数 A4、 A6、 A8、 A1 0、 A12、 A14、 A1 6。
表 4
Figure imgf000009_0001
图 9至图 15为具体实施例 2相对应的光学性能曲线图。 图 9至图 12分别 表征了实施例 2的近红外镜头的色差、 像散、 畸变和倍率色差等特征, 从图中 可以清楚地看出本发明的实施例 2的近红外镜头在色差、 像散和畸变等方面得 到明显改善,成像品质大大提高。图 1 3至图 15为具体实施例 2相对应的 FFT MTF 图, 用以反映消热差特征。 从图 1 3至图 15中可以清楚看出, 本实施例 2的近 红外镜头具有良好的消热差性能。
以上各光学性能的曲线图中的数据表示, 本发明近红外镜头具有较好的光 学效果, 实现了实现大孔径、 广角、 小畸变、 消热差。
上述表格中的具体参数仅仅是例示性的, 各镜片成分曲率半径、 面间隔、 以及折射率的值等, 不限于由上述实施例各数值所示出的值, 可以采用其他的 值, 都可以达到类似的技术效果。
虽然上面针对近红外镜头描述了本发明的原理以及具体实施方式, 但是在 本发明的上述教导下, 本领域技术人员可以在上述实施例的基础上进行各种改 进和变形, 而这些改进或者变形均落在本发明的保护范围内。 本领域技术人员 应该明白, 上面的具体描述只是为了解释本发明的目的, 而并非用于限制本发 明, 本发明的保护范围由权利要求及其等同物限定。

Claims

1、 一种近红外镜头, 该镜头沿光轴从物方到像方依次包括四组镜片, 第一 镜片为负光焦度的弯月形镜片, 凸面朝向物方, 采用非球面; 第二镜片为正或 负光焦度的弯月形镜片, 凸面朝向像方; 第三镜片为正光焦度的双凸形、 平凸 形或弯月形镜片, 平凸或弯月形时, 凸面朝向物方; 第四镜片为正光焦度的镜 片, 采用非球面。
2、 根据权利要求 1所述的近红外镜头, 其特征在于, 所述近红外镜头满足 下述的关系式:
① -0. 5<f/f l<-0. 2
其中 Π为第一镜片的焦距, f 为整个系统的焦距;
② | f2 | > | f l |
其中 I f 1 1为第一镜片的焦距的绝对值, I f 2 I为第二镜片的焦距的绝对值;
③ f4>f 3
其中 f 3为第三镜片的焦距, f4为第四镜片的焦距;
④ 0. 2<f/f 3<0. 6
其中 f 3为第三镜片的焦距, f 为整个系统的焦距。
3、 根据权利要求 1或 2所述的近红外镜头, 其特征在于, 所述近红外镜头 还包括光阑, 所述光阑位于所述第二镜片和第三镜片之间。
4、 根据权利要求 1或 2所述的近红外镜头, 其特征在于, 所述近红外镜头 满足下述的关系式:
0<dn3/dt<lE-05, -lE-3<dnl/dt<-5E-5, -lE-3<dn2/dt<-5E-5
其中 dnl/dt为第一个镜片的折射率相对的温度变化量;
其中 dn2/dt为第二个镜片的折射率相对的温度变化量;
其中 dn3/dt为第三个镜片的折射率相对的温度变化量。
5、 根据权利要求 1所述的近红外镜头, 其特征在于, 所述第三镜片为玻璃 镜片, 所述第一、 二和四镜片为塑料镜片。
6、 根据权利要求 1所述的近红外镜头, 其特征在于, 所述近红外镜头还包 括滤光片, 所述滤光片设置在第二镜片和第三镜片之间。
7、 根据权利要求 1所述的近红外镜头, 其特征在于, 各镜片的位置固定。
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