WO2016033743A1 - 摄影物镜 - Google Patents

摄影物镜 Download PDF

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Publication number
WO2016033743A1
WO2016033743A1 PCT/CN2014/085789 CN2014085789W WO2016033743A1 WO 2016033743 A1 WO2016033743 A1 WO 2016033743A1 CN 2014085789 W CN2014085789 W CN 2014085789W WO 2016033743 A1 WO2016033743 A1 WO 2016033743A1
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WO
WIPO (PCT)
Prior art keywords
lens
curved surface
optical axis
photographic objective
distance
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PCT/CN2014/085789
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English (en)
French (fr)
Inventor
李家英
周朝明
高云峰
Original Assignee
深圳市大族激光科技股份有限公司
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Application filed by 深圳市大族激光科技股份有限公司 filed Critical 深圳市大族激光科技股份有限公司
Priority to JP2017530373A priority Critical patent/JP6389960B2/ja
Priority to CN201480079905.0A priority patent/CN106461916B/zh
Priority to DE112014006760.1T priority patent/DE112014006760B4/de
Priority to PCT/CN2014/085789 priority patent/WO2016033743A1/zh
Priority to US15/328,875 priority patent/US9915805B2/en
Publication of WO2016033743A1 publication Critical patent/WO2016033743A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to the field of optical technology, and in particular to a photographic objective lens.
  • a photographic objective lens includes first to seventh lenses arranged in a coaxial manner along a transmission direction of incident light rays, the first lens being a meniscus type negative lens, and the second lens being a drum lens, the The three lens is a meniscus type negative lens, the fourth lens is a drum lens, the fifth lens is a double concave lens, the sixth lens is a meniscus positive lens, and the seventh lens is a double convex type a lens; the first lens includes a first curved surface and a second curved surface, the second lens includes a third curved surface and a fourth curved surface, the third lens includes a fifth curved surface and a sixth curved surface, and the fourth lens includes a seventh curved surface and an eighth surface
  • the curved surface, the fifth lens includes a ninth curved surface and a tenth curved surface, the sixth lens includes an eleventh curved surface and a twelfth curved surface, and the seventh lens includes a thirteenth curved surface and a fourteenth curved surface, and the two
  • the center thickness of the first to seventh lenses is 2 ⁇ 5%, 9 ⁇ 5%, 1.5 ⁇ 5%, 9 ⁇ 5%, 0.8 ⁇ 5%, 2 ⁇ 5%, 3 ⁇ 5%, respectively.
  • the unit is millimeters.
  • the distance between the second curved surface and the third curved surface on the optical axis is 4.2 mm ⁇ 5%
  • the spacing between the fourth curved surface and the fifth curved surface on the optical axis is 0.2. ⁇ 5%
  • the distance between the sixth curved surface and the seventh curved surface on the optical axis is 5 mm ⁇ 5%
  • the distance between the eighth curved surface and the ninth curved surface on the optical axis is 2.4 mm ⁇ 5%
  • the distance between the tenth curved surface and the eleventh curved surface on the optical axis is 1.6 mm ⁇ 5%
  • the distance between the twelfth and thirteenth curved surfaces on the optical axis is 0.2 mm ⁇ 5%.
  • the ratio of the refractive index to the Abbe number of the first to seventh lenses is (1.5/64) ⁇ 5%, (1.67/32) ⁇ 5%, (1.61/55). ⁇ 5%, (1.63/55) ⁇ 5%, (1.75/27) ⁇ 5%, (1.62/60) ⁇ 5%, (1.62/60) ⁇ 5%.
  • the clear apertures of the first to seventh lenses are 18 ⁇ 5%, 13 ⁇ 5%, 9 ⁇ 5%, 9 ⁇ 5%, 10 ⁇ 5%, and 11 ⁇ 5, respectively. %, 14 ⁇ 5%, in millimeters.
  • the distance of the first curved surface on the optical axis to the image plane of the photographic objective is 56.9 ⁇ 5% mm.
  • the above-mentioned photographic objective lens utilizes a drum lens having a large thickness, and can not only design a photographic objective lens with a large field of view, but also has a large relative aperture, a small volume, and a large working distance. Therefore, the photographic objective image field is solved, and at the same time, the requirements of large relative aperture, miniaturization and large working distance are ensured. It can be used in a 1-inch format photography system, suitable for various photosensitive media, such as CCD, photographic film, etc., especially suitable for photographic systems with high image quality requirements and small size requirements.
  • FIG. 1 is a schematic structural view of a photographic objective lens in an embodiment
  • Figure 2 is a M.T.F transfer function diagram of the photographic objective lens shown in Figure 1;
  • Figure 3 is a chromatic dispersion and distortion curve of the photographic objective lens shown in Figure 1;
  • Figure 4 is an aberration diagram of the photographic objective lens shown in Figure 1.
  • 5a-5f are partial enlarged views of the respective diffuse spots of Fig. 4.
  • the direction of propagation of light in this specification is transmitted from the left to the right of the drawing.
  • the positive and negative of the radius of curvature is based on the intersection of the spherical center position of the curved surface and the main optical axis.
  • the spherical center of the curved surface is left at this point, and the radius of curvature is negative; otherwise, the spherical center of the curved surface is right at the point, then the curvature
  • the radius is positive.
  • the object on the left side of the lens is the object side
  • the image on the right side of the lens is the image side.
  • a positive lens refers to a lens whose center thickness is larger than the edge thickness
  • a negative lens refers to a lens whose center thickness is smaller than the edge thickness.
  • Fig. 1 is a schematic view showing the structure of a photographic objective lens in an embodiment, and only parts related to the present invention are shown for convenience of explanation.
  • the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are sequentially arranged coaxially along the transmission direction of the incident light.
  • the first lens L1 is a meniscus negative lens
  • the second lens L2 is a drum lens
  • the third lens L3 is a meniscus negative lens
  • the fourth lens L4 is a drum lens
  • the fifth lens L5 is a double concave negative lens.
  • the sixth lens L6 is a meniscus positive lens
  • the seventh lens L7 is a biconvex positive lens.
  • the first lens L1 includes a first curved surface S1 and a second curved surface S2
  • the second lens L2 includes a third curved surface S3 and a fourth curved surface S4
  • the third lens L3 includes a fifth curved surface S5 and a sixth curved surface S6
  • the fourth lens L4 includes
  • the seventh curved surface S7 and the eighth curved surface S8 and the fifth lens L5 include a ninth curved surface S9 and a tenth curved surface S10
  • the sixth lens L6 includes an eleventh curved surface S11 and a twelfth curved surface S12
  • the seventh lens L7 includes the thirteenth curved surface The curved surface S13 and the fourteenth curved surface S14.
  • the two curved surfaces of each lens are the light incident surface and the light exit surface of the lens, respectively, and the first curved surface S1 to the fourteenth curved
  • the first curved surface S1 of the first lens L1 is convex toward the object, the radius of curvature is 30.5 mm, and the curved surface of the second curved surface S2 is the same as the first curved surface S1, and the radius of curvature is 9.6 mm. .
  • the center thickness d1 of the first lens L1 i.e., the thickness of the first lens L1 on the optical axis
  • the ratio of the refractive index Nd1 of the first lens L1 to the Abbe number Vd1 is 1.5/64.
  • the clear aperture ⁇ of the first lens is 18 mm.
  • the third curved surface S3 of the second lens L2 is convex toward the object side, the radius of curvature is 250 mm, the fourth curved surface S4 is convex toward the image side, the radius of curvature is -26 mm, and the central thickness d3 of the second lens L2 is 9 mm.
  • the ratio of the refractive index Nd2 of the second lens L2 to the Abbe number Vd2 is 1.67/32
  • the clear aperture ⁇ of the second lens is 13 mm
  • the distance d2 between the second lens L2 and the first lens L1 on the optical axis is 4.2mm.
  • the tolerance range of each parameter of the second lens L2 is still 5%.
  • the fifth curved surface S5 of the third lens L3 is convex toward the object side, the radius of curvature is 17 mm, the bending direction of the sixth curved surface S6 is the same as that of the fifth curved surface S5, the radius of curvature is 6.7 mm, and the central thickness d5 of the third lens L3 is 1.5. Mm.
  • the ratio of the refractive index Nd3 of the third lens L3 to the Abbe number Vd3 is 1.61/55
  • the clear aperture ⁇ of the third lens is 9 mm
  • the distance d4 between the third lens L3 and the second lens L2 on the optical axis is 0.2mm.
  • the tolerance range of each parameter of the third lens L3 is still 5%.
  • the seventh curved surface S7 of the fourth lens L4 is convex toward the object side, the curvature is 15.5 mm, the eighth curved surface S8 is convex outward with respect to the seventh curved surface S7, the radius of curvature is -12 mm, and the refractive index Nd4 of the fourth lens L4 is The ratio of the number of shells Vd4 is 1.63/55, and the center thickness d7 is 9 mm.
  • the clear aperture ⁇ of the fourth lens is 9 mm, and the distance d6 between the fourth lens L4 and the third lens L3 on the optical axis is 5 mm.
  • the tolerance range of each parameter of the fourth lens L4 is 5%.
  • the ninth curved surface S9 of the fifth lens L5 is convex toward the image side, the curvature is -13 mm, the tenth curved surface S10 is recessed inward with respect to the ninth curved surface S9, the radius of curvature is 20 mm, and the refractive index Nd5 of the fifth lens L5 and Abbe
  • the ratio of the number Vd5 is 1.75/27, and the center thickness d9 is 0.8 mm.
  • the clear aperture ⁇ of the fifth lens is 10 mm, and the distance d8 between the fifth lens L5 and the fourth lens L4 on the optical axis is 2.4 mm.
  • the tolerance range of each parameter of the fifth lens L5 is 5%.
  • the eleventh curved surface S11 of the sixth lens L6 is convex toward the image side, the radius of curvature is -30 mm, the twelfth curved surface S12 is convex toward the image side, the radius of curvature is -10 mm, and the refractive index Nd6 of the sixth lens L6 and Abbe
  • the ratio of the number Vd6 is 1.62/60, and the center thickness d11 of the sixth lens L6 is 2 mm.
  • the clear aperture ⁇ of the sixth lens is 11 mm, and the distance d10 between the sixth lens L6 and the fifth lens L5 on the optical axis is 1.6 mm.
  • the tolerance range of each parameter of the sixth lens L6 is still 5%.
  • the thirteenth curved surface S13 of the seventh lens L7 is convex toward the object side, the radius of curvature is 31 mm, the fourteenth curved surface S14 is convex toward the image side, the radius of curvature is -21 mm, and the refractive index Nd7 and Abbe number of the seventh lens L7
  • the ratio of Vd7 is 1.62/60, and the center thickness d13 is 14 mm.
  • the clear aperture ⁇ of the seventh lens is 14 mm, and the distance d12 between the seventh lens L7 and the sixth lens L6 on the optical axis is 0.2 mm.
  • the tolerance range of each parameter of the seventh lens L7 is 5%.
  • the total length of the photographic objective i.e., the distance of the first curved surface S1 from the optical axis to the image plane of the photographic objective lens
  • L 56.9 mm, which may have a tolerance range of 5%.
  • the use of an ultra-thick positive lens is contraindicated, and it is considered that this increases the curvature of the positive image surface and cannot be corrected to a plane, and it is impossible to design a photographic objective lens with a large field of view.
  • the above-mentioned photographic objective lens overcomes the technical prejudice, and the lens objective lens with a large thickness can not only design a photographic objective lens with a large field of view, but also has the characteristics of large relative aperture, small volume and large working distance. Therefore, the photographic objective image field is solved, and at the same time, the requirements of large relative aperture, miniaturization and large working distance are ensured.
  • each lens of the photographic objective lens uses only ordinary optical materials, so the cost is also relatively low.
  • FIG. 2 is a M.T.F transfer function diagram of the photographic objective lens shown in FIG. 1, in which the abscissa indicates the resolution in units of line pairs/mm, and TS represents the field of view in degrees. The figure shows that when the resolution reaches 20 line pairs/mm, M.T.F still has more than 0.6, which is a very ideal state.
  • 3 is a chromatic dispersion and distortion curve of the photographic objective lens shown in FIG. 1, in which the ordinate +Y represents the size of the field of view. The figure shows the beamlet aberration of the photographic objective, where the maximum distortion is less than 2%.
  • XT and YS are also less than 0.3 mm when they are worst.
  • Figure 5 is an aberration diagram of the photographic objective shown in Figure 1, showing the wide beam aberration of the photographic objective.
  • Figures 5a to 5f are partial enlarged views of the respective diffuse spots of Figure 4, wherein Figure 5a indicates the length of the scale of 200 microns, and each of Figures 5a to 5f indicates the angle of view (in degrees) and the image plane. Imaging diameter (in nanometers). It can be seen that the geometric dispersion of the photographic objective is only a few ten micrometers. It can be seen that the image quality has reached an ideal level in the entire image plane.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

一种摄影物镜，包括沿入射光线的传输方向依次共轴排列的第一至第七透镜（L1-L7），其中第一透镜（L1）为弯月型负透镜，第二透镜（L2）为鼓形透镜，第三透镜（L3）为弯月型负透镜，第四透镜（L4）为鼓形透镜，第五透镜（L5）为双凹型透镜，第六透镜（L6）为弯月型正透镜，第七透镜（L7）为双凸型透镜；每个透镜的两个曲面分别是透镜的光入射面和光出射面。

Description

摄影物镜
【技术领域】
本发明涉及光学技术领域，特别是涉及一种摄影物镜。
【背景技术】
在摄影领域中，部分用户有在必须保证大视场的基础上对设备小型化的需求。
【发明内容】
基于此，有必要提供一种小体积、大视场的摄影物镜。
一种摄影物镜，包括沿入射光线的传输方向依次共轴排列的第一透镜至第七透镜，所述第一透镜为弯月型负透镜，所述第二透镜为鼓形透镜，所述第三透镜为弯月型负透镜，所述第四透镜为鼓形透镜，所述第五透镜为双凹型透镜，所述第六透镜为弯月型正透镜，所述第七透镜为双凸型透镜；所述第一透镜包括第一曲面和第二曲面、第二透镜包括第三曲面和第四曲面、第三透镜包括第五曲面和第六曲面、第四透镜包括第七曲面和第八曲面、第五透镜包括第九曲面和第十曲面，第六透镜包括第十一曲面和第十二曲面，第七透镜包括第十三曲面和第十四曲面，每个透镜的两个曲面分别是透镜的光入射面和光出射面，第一曲面至第十四曲面沿入射光线的传输方向依次排布；所述第一曲面至第十四曲面的曲率半径依次为30.5±5%、9.6±5%、250±5%、-26±5%、17±5%、6.7±5%、15.5±5%、-12±5%、-13±5%、20±5%、-30±5%、-10±5%、31±5%、-21±5%，所述第一透镜至第七透镜的中心厚度依次为2±5%、9±5%、1.5±5%、9±5%、0.8±5%，、2±5%、3±5%，单位为毫米。
在其中一个实施例中，所述第二曲面和第三曲面之间在光轴上的间距为4.2毫米±5%，所述第四曲面和第五曲面之间在光轴上的间距为0.2毫米±5%，所述第六曲面和第七曲面之间在光轴上的间距为5毫米±5%、所述第八曲面和第九曲面之间在光轴上的间距为2.4毫米±5%、所述第十曲面和第十一曲面之间在光轴上的间距为1.6毫米±5%、所述第十二和第十三曲面之间在光轴上的间距为0.2毫米±5%。
在其中一个实施例中，所述第一透镜至第七透镜的折射率与阿贝数的比例依次为（1.5/64）±5%、（1.67/32）±5%、（1.61/55）±5%、（1.63/55）±5%、（1.75/27）±5%、（1.62/60）±5%、（1.62/60）±5%。
在其中一个实施例中，所述第一透镜至第七透镜的通光孔径依次为18±5%、13±5%、9±5%、9±5%、10±5%，11±5%、14±5%，单位为毫米。
在其中一个实施例中，所述第一曲面在光轴上至摄影物镜的像面的距离为56.9±5%毫米。
上述摄影物镜利用厚度很大的鼓形透镜，不但可以设计出超大视场的摄影物镜，而且该摄影物镜兼具大的相对孔径及小体积、大工作距离的特点。从而解决了摄影物镜平像场、同时要保证大相对孔径、小型化和大工作距离的要求。其可用于1寸画幅的摄影系统，适合各种感光介质，如CCD、感光胶片等，特别适用于对像质要求高，而体积要求小型化的摄影系统。
【附图说明】
通过附图中所示的本发明的优选实施例的更具体说明，本发明的上述及其它目的、特征和优势将变得更加清晰。在全部附图中相同的附图标记指示相同的部分，且并未刻意按实际尺寸等比例缩放绘制附图，重点在于示出本发明的主旨。
图1为一实施例中摄影物镜的结构示意图；
图2是图1所示摄影物镜的M.T.F传递函数图；
图3是图1所示摄影物镜的色散及畸变曲线图；
图4是图1所示摄影物镜的像差弥散斑图
图5a~5f是图4各个弥散斑的局部放大图。
【具体实施方式】
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本文所使用的术语“及／或”包括一个或多个相关的所列项目的任意的和所有的组合。
需要说明的是，本说明书中光的传播方向是从附图的左边向右边传播。曲率半径的正负以曲面的球心位置与主光轴的交点为准，曲面的球心在该点以左，则曲率半径为负；反之，曲面的球心在该点以右，则曲率半径为正。另外，位于镜头左边的为物方，位于镜头右边的为像方。正透镜是指透镜的中心厚度大于比边缘厚度的透镜，负透镜是指透镜的中心厚度小于边缘厚的透镜。
图1为一实施例中摄影物镜的结构示意图，为了便于说明，仅示出了与本发明相关的部分。包括沿入射光线的传输方向依次共轴排列的第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6以及第七透镜L7。其中第一透镜L1为弯月型负透镜，第二透镜L2为鼓形透镜，第三透镜L3为弯月型负透镜，第四透镜L4为鼓形透镜，第五透镜L5为双凹型负透镜，第六透镜L6为弯月型正透镜，第七透镜L7为双凸型正透镜。第一透镜L1包括第一曲面S1和第二曲面S2、第二透镜L2包括第三曲面S3和第四曲面S4、第三透镜L3包括第五曲面S5和第六曲面S6、第四透镜L4包括第七曲面S7和第八曲面S8、第五透镜L5包括第九曲面S9和第十曲面S10，第六透镜L6包括第十一曲面S11和第十二曲面S12，第七透镜L7包括第十三曲面S13和第十四曲面S14。每个透镜的两个曲面分别是透镜的光入射面和光出射面，第一曲面S1至第十四曲面S14沿入射光线的传输方向依次排布。
具体地，在其中一个实施例中，第一透镜L1的第一曲面S1向物方凸出，曲率半径为30.5mm，第二曲面S2的弯曲方向与第一曲面S1相同，曲率半径为9.6mm。第一透镜L1的中心厚度d1（即第一透镜L1在光轴上的厚度）为2mm。第一透镜L1的折射率Nd1与阿贝数Vd1的比例为1.5/64。第一透镜的通光孔径Φ为18mm。上述各参数并非唯一选择，均存在5%的公差范围，即允许各参数在±5%范围内变化。
第二透镜L2的第三曲面S3向物方凸出，曲率半径为250mm，第四曲面S4为向像方凸出，曲率半径为-26mm，第二透镜L2的中心厚度d3为9mm。第二透镜L2的折射率Nd2与阿贝数Vd2的比例为1.67/32，第二透镜的通光孔径Φ为13mm，第二透镜L2与第一透镜L1之间在光轴上的间距d2为4.2mm。第二透镜L2的各参数的公差范围仍为5%。
第三透镜L3的第五曲面S5向物方凸出，曲率半径为17mm，第六曲面S6的弯曲方向与第五曲面S5相同，曲率半径为6.7mm，第三透镜L3的中心厚度d5为1.5mm。第三透镜L3的折射率Nd3与阿贝数Vd3的比例为1.61/55，第三透镜的通光孔径Φ为9mm，第三透镜L3与第二透镜L2之间在光轴上的间距d4为0.2mm。第三透镜L3的各参数的公差范围仍为5%。
第四透镜L4的第七曲面S7向物方凸出，曲率为15.5mm，第八曲面S8相对第七曲面S7向外凸出，曲率半径为-12mm，第四透镜L4的折射率Nd4与阿贝数Vd4的比例为1.63/55，中心厚度d7为9mm。第四透镜的通光孔径Φ为9mm，第四透镜L4与第三透镜L3之间在光轴上的间距d6为5mm。第四透镜L4的各参数的公差范围同为5%。
第五透镜L5的第九曲面S9向像方凸出，曲率为-13mm，第十曲面S10相对第九曲面S9向内凹进，曲率半径为20mm，第五透镜L5的折射率Nd5与阿贝数Vd5的比例为1.75/27，中心厚度d9为0.8mm。第五透镜的通光孔径Φ为10mm，第五透镜L5与第四透镜L4之间在光轴上的间距d8为2.4mm。第五透镜L5的各参数的公差范围同为5%。
第六透镜L6的第十一曲面S11向像方凸出，曲率半径为-30mm，第十二曲面S12向像方凸出，曲率半径为-10mm，第六透镜L6的折射率Nd6与阿贝数Vd6的比例为1.62/60，且第六透镜L6的中心厚度d11为2mm。第六透镜的通光孔径Φ为11mm，第六透镜L6与第五透镜L5之间在光轴上的间距d10为1.6mm。第六透镜L6的各参数的公差范围仍为5%。
第七透镜L7的第十三曲面S13向物方凸出，曲率半径为31mm，第十四曲面S14向像方凸出，曲率半径为-21mm，第七透镜L7的折射率Nd7与阿贝数Vd7的比例为1.62/60，中心厚度d13为14mm。第七透镜的通光孔径Φ为14mm，第七透镜L7与第六透镜L6之间在光轴上的间距d12为0.2mm。第七透镜L7的各参数的公差范围同为5%。
另外，上述摄影物镜针对λ=550nm的绿光，λ=486nm的蓝光和λ=656nm的红光进行了消色差设计。摄影物镜的总长度（即第一曲面S1在光轴上至摄影物镜的像面的距离）L=56.9毫米，可以有5%的公差范围。
上述摄影物镜的焦距f=110毫米，相对孔径D/ƒ=1：2.8，视场角2ω=72度。
在摄影物镜的领域中，一般认为使用超厚的正透镜是犯忌的，认为这样会增加正像面弯曲，无法校正为平面，而无法设计出大视场的摄影物镜。上述摄影物镜克服了技术偏见，利用厚度很大的鼓形透镜，不但可以设计出超大视场的摄影物镜，而且该摄影物镜兼具大的相对孔径及小体积、大工作距离的特点。从而解决了摄影物镜平像场、同时要保证大相对孔径、小型化和大工作距离的要求。其可用于1寸画幅的摄影系统，适合各种感光介质，如CCD、感光胶片等，特别适用于对像质要求高，而体积要求小型化的摄影系统。值得一提的是，该摄影物镜的各个透镜只使用了普通的光学材料，因此造价也是相当低廉的。
图2是图1所示摄影物镜的M.T.F传递函数图，其中横坐标表示分辨率，单位为线对/毫米，TS表示视场，单位为度。该图显示当分辨率达到20线对/毫米时，M.T.F仍然有0.6以上，达到了非常理想的状态。图3是图1所示摄影物镜的色散及畸变曲线图，其中纵坐标+Y表示视场的大小。该图示出了摄影物镜的细光束像差，其中畸变的最大值小于2%。XT、YS最差时也小于0.3mm。图5是图1所示摄影物镜的像差弥散斑图，示出了摄影物镜的宽光束像差。图5a~5f是图4各个弥散斑的局部放大图，其中图5a标出了200微米的标尺长度，图5a~5f中每幅图都标出了视角（单位为度）和在像面的成像直径（单位为纳米）。可以看到摄影物镜的几何弥散最大也只有十几微米。由此可见在整个的像面内，像质都达到了理想的水平。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (5)

  1. 一种摄影物镜，其特征在于，包括沿入射光线的传输方向依次共轴排列的第一透镜至第七透镜，所述第一透镜为弯月型负透镜，所述第二透镜为鼓形透镜，所述第三透镜为弯月型负透镜，所述第四透镜为鼓形透镜，所述第五透镜为双凹型透镜，所述第六透镜为弯月型正透镜，所述第七透镜为双凸型透镜；所述第一透镜包括第一曲面和第二曲面、第二透镜包括第三曲面和第四曲面、第三透镜包括第五曲面和第六曲面、第四透镜包括第七曲面和第八曲面、第五透镜包括第九曲面和第十曲面，第六透镜包括第十一曲面和第十二曲面，第七透镜包括第十三曲面和第十四曲面，每个透镜的两个曲面分别是透镜的光入射面和光出射面，第一曲面至第十四曲面沿入射光线的传输方向依次排布；
    所述第一曲面至第十四曲面的曲率半径依次为30.5±5%、9.6±5%、250±5%、-26±5%、17±5%、6.7±5%、15.5±5%、-12±5%、-13±5%、20±5%、-30±5%、-10±5%、31±5%、-21±5%，所述第一透镜至第七透镜的中心厚度依次为2±5%、9±5%、1.5±5%、9±5%、0.8±5%，、2±5%、3±5%，单位为毫米。
  2. 根据权利要求1所述的摄影物镜，其特征在于，所述第二曲面和第三曲面之间在光轴上的间距为4.2毫米±5%，所述第四曲面和第五曲面之间在光轴上的间距为0.2毫米±5%，所述第六曲面和第七曲面之间在光轴上的间距为5毫米±5%、所述第八曲面和第九曲面之间在光轴上的间距为2.4毫米±5%、所述第十曲面和第十一曲面之间在光轴上的间距为1.6毫米±5%、所述第十二和第十三曲面之间在光轴上的间距为0.2毫米±5%。
  3. 根据权利要求1所述的摄影物镜，其特征在于，所述第一透镜至第七透镜的折射率与阿贝数的比例依次为（1.5/64）±5%、（1.67/32）±5%、（1.61/55）±5%、（1.63/55）±5%、（1.75/27）±5%、（1.62/60）±5%、（1.62/60）±5%。
  4. 根据权利要求1所述的摄影物镜，其特征在于，所述第一透镜至第七透镜的通光孔径依次为18±5%、13±5%、9±5%、9±5%、10±5%，11±5%、14±5%，单位为毫米。
  5. 根据权利要求1所述的摄影物镜，其特征在于，所述第一曲面在光轴上至摄影物镜的像面的距离为56.9±5%毫米。
PCT/CN2014/085789 2014-09-03 2014-09-03 摄影物镜 WO2016033743A1 (zh)

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