WO2019029436A1 - 定焦镜头和包括该定焦镜头的3ccd摄像机 - Google Patents

定焦镜头和包括该定焦镜头的3ccd摄像机 Download PDF

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Publication number
WO2019029436A1
WO2019029436A1 PCT/CN2018/098422 CN2018098422W WO2019029436A1 WO 2019029436 A1 WO2019029436 A1 WO 2019029436A1 CN 2018098422 W CN2018098422 W CN 2018098422W WO 2019029436 A1 WO2019029436 A1 WO 2019029436A1
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WIPO (PCT)
Prior art keywords
lens
crescent
efl
fixed focus
satisfies
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PCT/CN2018/098422
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English (en)
French (fr)
Inventor
杨敏
林佳敏
王火红
曾振煌
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福建浩蓝光电有限公司
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Application filed by 福建浩蓝光电有限公司 filed Critical 福建浩蓝光电有限公司
Priority to GB1911569.0A priority Critical patent/GB2573716B/en
Priority to DE112018000721.9T priority patent/DE112018000721B4/de
Publication of WO2019029436A1 publication Critical patent/WO2019029436A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements

Definitions

  • the present invention relates to the field of optical imaging, and more particularly to a fixed focus lens and a 3CCD camera including the fixed focus lens.
  • the built-in prism of the camera can accurately divide the light entering the lens into three colors and transmit it to the corresponding CCD chip. This process can accurately record the color and provide detailed and sharp images to meet professional shooting. Requirement, but since the dichroic prism group is placed directly in the optical path, a certain aberration will occur, so only a specially designed lens can achieve the desired imaging effect.
  • the general lens design has the best aberration correction at the usual focus distance, but it may cause the aberration at the closest shooting distance.
  • the object of the present invention is to provide a specially designed fixed-focus lens suitable for a 3CCD camera, which is beneficial to the imaging potential of the 3CCD system, and meets the requirements of professional shooting for high resolution, low chromatic aberration and small distortion of the 3CCD system lens.
  • the technical solution adopted by the present invention is:
  • a fixed-focus lens adapted to a 3CCD camera comprising: a first crescent concave lens having a negative refractive power; and a second crescent concave lens having a negative refractive power; a third crescent concave lens having a negative refractive power; a first crescent lens having a positive refractive power; a first lenticular lens having a positive refractive power; a first biconcave lens having a negative refractive power; an iris diaphragm; having a negative refractive power a fourth crescent lens; a second crescent lens having a positive refractive power; a third crescent lens having a positive refractive power; a second lenticular lens having a positive refractive power; a third lenticular lens having a positive refractive power; having a negative refractive power
  • the fifth crescent lens is adapted to a 3CCD camera, comprising: a first crescent concave lens having a negative refractive
  • the first lenticular lens and the first biconcave lens are glued together to form a first cemented lens; and the fourth crescent lens and the second crescent lens are glued together to form a second glue.
  • a lens; and the third lenticular lens and the fifth crescent lens are cemented to each other to form a third cemented lens.
  • the object side surface of the first crescent lens is convex; the object side of the second crescent lens is convex; the object side of the third crescent lens is convex; the first crescent lens
  • the object side surface is a concave surface; the object side surface of the second cemented lens is a concave surface; and the object side surface of the third crescent lens is a concave surface.
  • the interval d1-2 between the first crescent lens and the second crescent lens satisfies 0.12 ⁇ d1-2/EFL ⁇ 0.14; the interval d2-3 between the second crescent lens and the third crescent lens Satisfying 0.08 ⁇ d2-3/EFL ⁇ 0.12; the interval d3-4 between the third crescent lens and the first crescent lens satisfies 0.12 ⁇ d3-4/EFL ⁇ 0.16; between the first crescent lens and the first cemented lens
  • the interval d4-56 satisfies 0.45 ⁇ d4-56/EFL ⁇ 0.49; the interval d56-78 between the first cemented lens and the second cemented lens satisfies 1.12 ⁇ d45-78/EFL ⁇ 1.16; the second cemented lens and the third crescent lens
  • the interval d78-9 between the convex lenses satisfies 0.003 ⁇ d1-2/EFL ⁇ 0.004; the interval d9-10 between the third crescent lens and the second lenticular lens satisfies 0.002 ⁇ d9
  • the fixed-focus lens has an angle of view of 55°.
  • a distance D1 between the iris diaphragm and the third crescent lens and a distance D2 between the fifth crescent lens and the image plane satisfy 1.5 ⁇ (D1+D2)/EFL ⁇ 2.5, EFL is the focal length value of the fixed focus lens.
  • the fixed focus lens satisfies 0.4 ⁇ y/EFL ⁇ 0.6, where y is the half image height of the fixed focus lens, and EFL is the focal length value of the fixed focus lens.
  • the maximum clear aperture of the fixed focus lens satisfies Fno ⁇ 3, where Fno is the F number of the fixed focus lens.
  • the rear working distance BFL of the fixed focus lens satisfies BFL/EFL>1.2, where EFL is the focal length value of the lens.
  • the total length TTL of the fixed focus lens satisfies TTL/EFL ⁇ 6, where EFL is the focal length value of the lens.
  • the invention also relates to a 3CCD camera comprising a fixed focus lens as described above.
  • the invention has the advantages that the lens can have high resolution, low chromatic aberration, small distortion and the like, and the optical system design adopts a floating focusing structure, which can improve the image quality in shooting within a certain wide working range. And can provide photoelectric signals for 1/2" 3CCD color cameras, producing clear and natural color images.
  • FIG. 1 is a schematic structural view of a fixed focus lens according to an embodiment of the present invention.
  • FIG. 2 is a light path diagram of a fixed focus lens according to an embodiment of the present invention.
  • FIG. 3 is an axial spherical aberration diagram of a fixed focus lens according to an embodiment of the present invention.
  • FIG. 4 is a vertical axis chromatic aberration diagram of a fixed focus lens according to an embodiment of the present invention.
  • Figure 5 is a speckle pattern of a fixed focus lens in accordance with an embodiment of the present invention.
  • FIG. 6 is a MTF graph of a fixed focus lens according to an embodiment of the present invention.
  • FIG. 7 is a phase contrast diagram of a fixed focus lens in accordance with an embodiment of the present invention.
  • A-1 first crescent lens
  • A-2 second crescent lens
  • A-3 third crescent lens
  • A-4 first moon lenticular lens
  • A-5 first lenticular lens
  • A-6 first double concave lens
  • A-7 fourth month concave lens
  • A-8 second crescent lens
  • A-9 third crescent lens
  • A-10 second lenticular lens
  • A-11 third lenticular lens
  • A-12 fifth crescent concave lens.
  • a fixed-focus lens adapted to a 3CCD camera includes a first crescent concave lens A having a negative refractive power, which is disposed coaxially from the object side to the image side.
  • a second crescent lens A-2 having a negative refractive power
  • a third crescent lens A-3 having a negative refractive power
  • a first crescent lens A-4 having a positive refractive power
  • a first lenticular lens having a positive refractive power
  • A-5 first biconcave lens A-6 having negative refractive power
  • iris diaphragm fourth crescent lens A-7 having negative refractive power
  • second crescent lens A-8 having positive refractive power
  • the second lenticular lens A-10 having a positive refractive power
  • the third lenticular lens A-11 having a positive refractive power
  • the fifth crescent concave lens A-12 having a negative refractive power.
  • the first lenticular lens A-5 and the first biconcave lens A-6 are glued together to form a first cemented lens; and the fourth crescent lens A-7 and the second The crescent lens A-8 is cemented to each other to form a second cemented lens; and the third lenticular lens A-11 and the fifth crescent lens A-12 are glued to each other to form a third cemented lens.
  • the object side surface of the first crescent lens A-1 is a convex surface
  • the object side surface of the second crescent concave lens A-2 is a convex surface
  • the object side surface of the third crescent concave lens A-3 is a convex surface
  • a surface of the first crescent lens A-4 is a concave surface
  • a side surface of the second cemented lens is a concave surface
  • an object side surface of the third crescent lens A-9 is a concave surface.
  • the interval d3-4 between the first crescent lens A-4 and the first crescent lens A-4 satisfies 0.12 ⁇ d3-4/EFL ⁇ 0.16;
  • the interval d4-56 between the first crescent lens A-4 and the first cemented lens satisfies 0.45 ⁇ d4 -56/EFL ⁇ 0.49;
  • the interval d56-78 between the first cemented lens and the second cemented lens satisfies 1.12 ⁇ d45-78/EFL ⁇ 1.16;
  • the interval between the second cemented lens and the third crescent lens A-9 D78-9 satisfies 0.003 ⁇ d1-2/EFL ⁇ 0.004;
  • the fixed-focus lens has an angle of view of 55°.
  • the distance D1 between the iris diaphragm and the third crescent lens A-9 and the distance D2 between the fifth crescent lens A-12 and the image plane satisfy 1.5 ⁇ (D1+D2)/EFL ⁇ 2.5, EFL is the focal length value of the fixed focus lens. Therefore, the optical system has a floating focus function, and can improve the image quality of the captured image within a certain range.
  • the fixed focus lens satisfies 0.4 ⁇ y/EFL ⁇ 0.6, where y is the half image height of the fixed focus lens, and EFL is the focal length value of the fixed focus lens.
  • the maximum clear aperture of the fixed focus lens satisfies Fno ⁇ 3, where Fno is the F number of the fixed focus lens.
  • the rear working distance BFL of the fixed focus lens satisfies BFL/EFL>1.2, where EFL is the focal length value of the lens.
  • the total length TTL of the fixed focus lens satisfies TTL/EFL ⁇ 6, where EFL is the focal length value of the lens.
  • the invention also relates to a 3CCD camera comprising a fixed focus lens as described above.
  • the lens can be characterized by high resolution, low chromatic aberration, small distortion, etc.
  • the floating focus mechanism can be used inside the system to improve the image quality in close-range shooting, and can provide photoelectric signals for 1/2′′ 3CCD color cameras. Clear and natural color images.
  • FIG. 2 shows an optical path diagram of a fixed focus lens in accordance with an embodiment of the present invention.
  • the fixed focus lens can process the incident light well and converge on the image surface.
  • the fixed focus lens according to the embodiment of the present invention has very good performance and can meet practical needs.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the data of the fixed focus lens is as follows:
  • Optical surface Radius mm Thickness or distance mm Refractive index Abbe number 1 51.220 8.80 1.94595 17.98 2 27.006 3.437 3 74.631 1.900 1.59282 68.63 4 36.545 2.863 5 302.344 1.900 1.59282 68.63 6 54.124 4.241 7 -108.031 2.700 1.90043 37.37 8 -55.993 13.517 9 70.329 5.570 1.90043 37.37 10 -35.163 5.140 1.52345 52.26 11 134.713 12.916 Variable aperture gigantic D1 13 -24.246 7.750 1.90366 31.32 14 -762.942 5.800 1.59282 68.63 15 -31.720 0.100 16 -207.470 4.600 1.59282 68.63 17 -46.119 0.100 18 190.902 4.990 1.59282 68.63 19 -70.879 0.100 20 58.095 8.370 1.59282 68.63 twenty one -55.663 2.100 1.90043 37.37 twenty two -486.4
  • the numbers 1 to 22 sequentially indicate the distance from the optical surface of each lens from the object side to the image side to the next optical surface immediately adjacent thereto (in the case where both optical surfaces belong to the same lens, it indicates the thickness of the lens) ).
  • the thickness or distance value is marked as “D1” and “D2”, indicating the distance between the two surfaces when the lens is at different working distances. The distance is shown in Table 2.
  • the focal length of the fixed focus lens is 28.5 mm. Therefore, the fixed focus lens can meet the mainstream needs.
  • the maximum clear aperture F number of the fixed focus lens is 2.8, which satisfies: Fno ⁇ 3, where Fno is the F number of the optical system.
  • the angle of view of the fixed focus lens is 55°.
  • the lens is matched with a 1/8" CCD to achieve a lens resolution of 15 million pixels.

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

Abstract

本发明涉及一种两组式变焦镜头，其特征在于，包括：从物方侧到像方侧依次同轴设置的具有负光焦度的第一透镜组、孔径光阑、具有正光焦度的第二透镜组，所述第一透镜组包括从物方侧到像方侧依次同轴设置的具有负光焦度的第一月牙透镜、具有负光焦度的第一双凹透镜以及具有正光焦度的第一双凸透镜；所述第二透镜组包括从物方侧到像方侧依次同轴设置的具有正光焦度的第二双凸透镜、具有正光焦度的第二月牙透镜、具有负光焦度的第二双凹透镜、具有正光焦度的第三双凸透镜、具有负光焦度的第三月牙透镜、具有负光焦度的第四月牙透镜、具有正光焦度的第四双凸透镜。

Description

定焦镜头和包括该定焦镜头的3CCD摄像机 技术领域
本发明涉及一种光学成像领域，尤其涉及一种定焦镜头和包括该定焦镜头的3CCD摄像机。
 背景技术
随着3CCD系统的完善，摄像机内置棱镜能将进入镜头的光线准确的分为三种颜色并传到相应的CCD芯片，此过程能精确的记录色彩，提供细节丰富明锐的影像，满足专业拍摄的要求，但由于分光棱镜组是直接放在光路中，会产生一定的像差，所以只有专门设计的镜头才能达到所需的成像效果。
一般镜头的设计，都在常用对焦距离处有最佳的像差矫正，却可能在最近拍摄距离时出现结像差的情形。
 技术问题
本发明的目的在于提供一种专门设计的适配于3CCD摄像机的定焦镜头，有利于发挥3CCD系统成像潜力，满足专业拍摄对适配3CCD系统镜头高分辨、低色差、小畸变等要求。
 技术解决方案
为了解决上述技术问题，本发明采用的技术方案为：
一种适配于3CCD摄像机的定焦镜头，其特征在于：包括由物面侧至像面侧依次同轴设置的：具有负屈折力的第一月牙凹透镜；具有负屈折力的第二月牙凹透镜；具有负屈折力的第三月牙凹透镜；具有正屈折力的第一月牙凸透镜；具有正屈折力的第一双凸透镜；具有负屈折力的第一双凹透镜；可变光阑；具有负屈折力的第四月牙凹透镜；具有正屈折力的第二月牙凸透镜；具有正屈折力的第三月牙凸透镜；具有正屈折力的第二双凸透镜；具有正屈折力的第三双凸透镜；具有负屈折力的第五月牙凹透镜。
在可选实施例中，所述第一双凸透镜与所述第一双凹透镜相互胶合以形成第一胶合透镜；并且所述第四月牙凹透镜与所述第二月牙凸透镜相互胶合以形成第二胶合透镜；并且所述第三双凸透镜和所述第五月牙凹透镜相互胶合以形成第三胶合透镜。
在可选实施例中，所述第一月牙凹透镜的物侧面为凸面；所述第二月牙凹透镜的物侧面是凸面；所述第三月牙凹透镜的物侧面为凸面；所述第一月牙凸透镜的物侧面为凹面；所述第二胶合透镜的物侧面为凹面；所述第三月牙凸透镜的物侧面为凹面。
在可选实施例中，第一月牙凹透镜与第二月牙凹透镜之间的间隔d1-2 满足0.12<d1-2/EFL<0.14；第二月牙凹透镜与第三月牙凹透镜之间的间隔d2-3 满足0.08<d2-3/EFL<0.12；第三月牙凹透镜与第一月牙凸透镜之间的间隔d3-4 满足0.12<d3-4/EFL<0.16；第一月牙凸透镜与第一胶合透镜之间的间隔d4-56 满足0.45<d4-56/EFL<0.49；第一胶合透镜与第二胶合透镜之间的间隔d56-78 满足1.12<d45-78/EFL<1.16；第二胶合透镜与第三月牙凸透镜之间的间隔d78-9 满足0.003<d1-2/EFL<0.004；第三月牙凸透镜与第二双凸透镜之间的间隔d9-10 满足0.002<d9-10/EFL<0.005；第二双凸透镜与第三胶合透镜之间的间隔d10-11/12 满足0.003<d10-11/12/EFL<0.005；第三胶合透镜与像面之间的间隔d11/12-I 满足1.20<d11/12-I/EFL<1.40,         其中EFL为镜头的焦距。
在可选实施例中，所述定焦镜头的视场角为55°。
在可选实施例中，所述可变光阑与所述第三月牙凸透镜之间的距离D1和所述第五月牙凹透镜到像面之间的距离D2满足1.5＜（D1+D2）/EFL＜2.5，EFL为所述定焦镜头的焦距值。
在可选实施例中，所述定焦镜头满足0.4<y/EFL<0.6,其中y为所述定焦镜头的半像高，EFL为所述定焦镜头的焦距值。
在可选实施例中，所述定焦镜头的最大通光孔径满足Fno<3，其中Fno为定焦镜头的F数。
在可选实施例中，所述定焦镜头的后工作距离BFL满足BFL/EFL>1.2，其中EFL为镜头的焦距值。
在可选实施例中，所述定焦镜头的总长TTL满足TTL/EFL<6，其中EFL为镜头的焦距值。
本发明还涉及一种3CCD摄像机，包括如上文所述的定焦镜头。
 有益效果
本发明的有益效果在于：该镜头可具有高分辨率、低色像差、畸变小等特点，光学系统设计采用的是浮动对焦的结构，能在一定宽的工作范围内提高拍摄中图像画质，且能为1/2″3CCD彩色摄像机提供光电信号，产生清晰自然的彩色图像。
 附图说明
图1是根据本发明的实施例的定焦镜头的结构示意图；
图2是根据本发明的实施例的定焦镜头的光路图；
图3是根据本发明的实施例的定焦镜头的轴向球差图；
图4是根据本发明的实施例的定焦镜头的垂轴色差图；
图5是根据本发明的实施例的定焦镜头的弥散斑图；
图6是根据本发明的实施例的定焦镜头的MTF曲线图；
图7是根据本发明的实施例的定焦镜头的相对照度图。
标号说明：
A-1、第一月牙凹透镜；A-2、第二月牙凹透镜；A-3、第三月牙凹透镜；
A-4、第一月牙凸透镜；A-5、第一双凸透镜；A-6、第一双凹透镜；
A-7、第四月牙凹透镜；A-8、第二月牙凸透镜；A-9、第三月牙凸透镜；
A-10、第二双凸透镜；A-11、第三双凸透镜；A-12、第五月牙凹透镜。
 本发明的实施方式
为详细说明本发明的技术内容、所实现目的及效果，以下结合实施方式并配合附图予以说明。
如图1所示，根据本发明的实施例的一种适配于3CCD摄像机的定焦镜头包括由物面侧至像面侧依次同轴设置的：具有负屈折力的第一月牙凹透镜A-1；具有负屈折力的第二月牙凹透镜A-2；具有负屈折力的第三月牙凹透镜A-3；具有正屈折力的第一月牙凸透镜A-4；具有正屈折力的第一双凸透镜A-5；具有负屈折力的第一双凹透镜A-6；可变光阑；具有负屈折力的第四月牙凹透镜A-7；具有正屈折力的第二月牙凸透镜A-8；具有正屈折力的第三月牙凸透镜A-9；具有正屈折力的第二双凸透镜A-10；具有正屈折力的第三双凸透镜A-11；具有负屈折力的第五月牙凹透镜A-12。
在可选实施例中，所述第一双凸透镜A-5与所述第一双凹透镜A-6相互胶合以形成第一胶合透镜；并且所述第四月牙凹透镜A-7与所述第二月牙凸透镜A-8相互胶合以形成第二胶合透镜；并且所述第三双凸透镜A-11和所述第五月牙凹透镜A-12相互胶合以形成第三胶合透镜。
在可选实施例中，所述第一月牙凹透镜A-1的物侧面为凸面；所述第二月牙凹透镜A-2的物侧面是凸面；所述第三月牙凹透镜A-3的物侧面为凸面；所述第一月牙凸透镜A-4的物侧面为凹面；所述第二胶合透镜的物侧面为凹面；所述第三月牙凸透镜A-9的物侧面为凹面。
在可选实施例中，第一月牙凹透镜A-1与第二月牙凹透镜A-2之间的间隔d1-2 满足0.12<d1-2/EFL<0.14；第二月牙凹透镜A-2与第三月牙凹透镜A-3之间的间隔d2-3 满足0.08<d2-3/EFL<0.12；第三月牙凹透镜A-3与第一月牙凸透镜A-4之间的间隔d3-4 满足0.12<d3-4/EFL<0.16；第一月牙凸透镜A-4与第一胶合透镜之间的间隔d4-56 满足0.45<d4-56/EFL<0.49；第一胶合透镜与第二胶合透镜之间的间隔d56-78 满足1.12<d45-78/EFL<1.16；第二胶合透镜与第三月牙凸透镜A-9之间的间隔d78-9 满足0.003<d1-2/EFL<0.004；第三月牙凸透镜A-9与第二双凸透镜A-10之间的间隔d9-10 满足0.002<d9-10/EFL<0.005；第二双凸透镜A-10与第三胶合透镜之间的间隔d10-11/12 满足0.003<d10-11/12/EFL<0.005；第三胶合透镜与像面之间的间隔d11/12-I 满足1.20<d11/12-I/EFL<1.40,    其中EFL为镜头的焦距。
在可选实施例中，所述定焦镜头的视场角为55°。
在可选实施例中，所述可变光阑与所述第三月牙凸透镜A-9之间的距离D1和，所述第五月牙凹透镜A-12到像面之间的距离D2满足1.5＜（D1+D2）/EFL＜2.5，EFL为所述定焦镜头的焦距值。从而该光学系统具有浮动对焦功能，能够在一定范围内提高拍摄的图像画质。
在可选实施例中，所述定焦镜头满足0.4<y/EFL<0.6,其中y为所述定焦镜头的半像高，EFL为所述定焦镜头的焦距值。
在可选实施例中，所述定焦镜头的最大通光孔径满足Fno<3，其中Fno为定焦镜头的F数。
在可选实施例中，所述定焦镜头的后工作距离BFL满足BFL/EFL>1.2，其中EFL为镜头的焦距值。
在可选实施例中，所述定焦镜头的总长TTL满足TTL/EFL<6，其中EFL为镜头的焦距值。
本发明还涉及一种3CCD摄像机，包括如上文所述的定焦镜头。
该镜头可具有高分辨率、低色像差、畸变小等特点，系统内部可使用浮动对焦机构，提高近距离拍摄中图像画质，且能为1/2″3CCD彩色摄像机提供光电信号，产生清晰自然的彩色图像。
图2示出了根据本发明的实施例的定焦镜头的光路图。从图中可看出，该定焦镜头可以对入射的光线进行良好的处理并且汇聚到像面上。
从图3到图7可看出，根据本发明的实施例的定焦镜头具有非常好的性能，可以满足实际需要。
实施例一：
在本实施例中，定焦镜头的数据如下表：
光学面 半径mm 厚度或距离mm 折射率 阿贝数
1 51.220 8.80 1.94595 17.98
2 27.006 3.437    
3 74.631 1.900 1.59282 68.63
4 36.545 2.863    
5 302.344 1.900 1.59282 68.63
6 54.124 4.241    
7 -108.031 2.700 1.90043 37.37
8 -55.993 13.517    
9 70.329 5.570 1.90043 37.37
10 -35.163 5.140 1.52345 52.26
11 134.713 12.916    
可变光阑 无穷大 D1    
13 -24.246 7.750 1.90366 31.32
14 -762.942 5.800 1.59282 68.63
15 -31.720 0.100    
16 -207.470 4.600 1.59282 68.63
17 -46.119 0.100    
18 190.902 4.990 1.59282 68.63
19 -70.879 0.100    
20 58.095 8.370 1.59282 68.63
21 -55.663 2.100 1.90043 37.37
22 -486.488 D2    
像面 无穷大      
其中数字1~22依次表示从物面侧到像面侧的各个透镜的光学面到紧邻的下一光学面的距离（在两个光学面都属于同一透镜的情况下，其表示该透镜的厚度）。厚度或距离值标示为“D1”、“D2”，表示镜头在不同工作距离下时，两表面间的距离，其距离如表二所示。
表二
厚度 工作距离800(mm) 工作距离1000(mm) 工作距离1200(mm)
D1 19.603 19.809 19.950
D2 37.387 37.181 37.040
在本实施例中，该定焦镜头的焦距为28.5mm。从而该定焦镜头可满足主流需要。
在本实施例中，定焦镜头的最大通光孔径F数为2.8，满足：Fno<3，其中Fno为光学系统的F数。
在本实施例中，定焦镜头的视场角为55°。
在本实施例中，定焦镜头与1/8″的CCD匹配，半像高为15mm，y/EFL=0.526，满足0.4<y/EFL<0.6,其中y为所述光学系统的半像高，EFL为镜头的焦距值。
在本实施例中，定焦镜头的后工作截距BFL为37.039mm，BFL/EFL=1.299,满足:BFL/EFL>1.2,其中EFL为镜头的焦距值。
在本实施例中，定焦镜头的总长TTL为167mm，TTL/EFL=5.86，满足: TTL/EFL<6, 其中EFL为镜头的焦距值。
在本实施例中，该镜头与1/8″CCD匹配能使镜头分辨率达到1500万像素。
以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何熟悉本专业的技术人员，在不脱离本发明技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。

Claims (10)

  1. 一种定焦镜头，其特征在于：包括由物面侧至像面侧依次同轴设置的：具有负屈折力的第一月牙凹透镜；具有负屈折力的第二月牙凹透镜；具有负屈折力的第三月牙凹透镜；具有正屈折力的第一月牙凸透镜；具有正屈折力的第一双凸透镜；具有负屈折力的第一双凹透镜；可变光阑；具有负屈折力的第四月牙凹透镜；具有正屈折力的第二月牙凸透镜；具有正屈折力的第三月牙凸透镜；具有正屈折力的第二双凸透镜；具有正屈折力的第三双凸透镜；具有负屈折力的第五月牙凹透镜。
  2. 根据权利要求1所述的定焦镜头，其特征在于：所述第一双凸透镜与所述第一双凹透镜相互胶合以形成第一胶合透镜；并且所述第四月牙凹透镜与所述第二月牙凸透镜相互胶合以形成第二胶合透镜；并且所述第三双凸透镜和所述第五月牙凹透镜相互胶合以形成第三胶合透镜。
  3. 根据权利要求2所述的定焦镜头，其特征在于：所述第一月牙凹透镜的物侧面为凸面；所述第二月牙凹透镜的物侧面是凸面；所述第三月牙凹透镜的物侧面为凸面；所述第一月牙凸透镜的物侧面为凹面；所述第二胶合透镜的物侧面为凹面；所述第三月牙凸透镜的物侧面为凹面。
  4. 根据权利要求2所述的定焦镜头，其特征在于:第一月牙凹透镜与第二月牙凹透镜之间的间隔d1-2 满足0.12<d1-2/EFL<0.14；第二月牙凹透镜与第三月牙凹透镜之间的间隔d2-3 满足0.08<d2-3/EFL<0.12；第三月牙凹透镜与第一月牙凸透镜之间的间隔d3-4 满足0.12<d3-4/EFL<0.16；第一月牙凸透镜与第一胶合透镜之间的间隔d4-56 满足0.45<d4-56/EFL<0.49；第一胶合透镜与第二胶合透镜之间的间隔d56-78 满足1.12<d45-78/EFL<1.16；第二胶合透镜与第三月牙凸透镜之间的间隔d78-9 满足0.003<d1-2/EFL<0.004；第三月牙凸透镜与第二双凸透镜之间的间隔d9-10 满足0.002<d9-10/EFL<0.005；第二双凸透镜与第三胶合透镜之间的间隔d10-11/12 满足0.003<d10-11/12/EFL<0.005；第三胶合透镜与像面之间的间隔d11/12-I 满足1.20<d11/12-I/EFL<1.40,  其中EFL为镜头的焦距。
  5. 根据权利要求1所述的定焦镜头，其特征在于:所述可变光阑与所述第三月牙凸透镜之间的距离D1和所述第五月牙凹透镜到像面之间的距离D2满足1.5＜（D1+D2）/EFL＜2.5，EFL为所述定焦镜头的焦距值。
  6. 根据权利要求1所述的定焦镜头，其特征在于:所述定焦镜头满足0.4<y/EFL<0.6,其中y为所述定焦镜头的半像高，EFL为所述定焦镜头的焦距值。
  7. 根据权利要求1所述的定焦镜头，其特征在于: 所述定焦镜头的最大通光孔径满足Fno<3，其中Fno为定焦镜头的F数。
  8. 根据权利要求1所述的定焦镜头，其特征在于:所述定焦镜头的后工作距离BFL满足BFL/EFL>1.2，其中EFL为镜头的焦距值。
  9. 根据权利要求1所述的定焦镜头，其特征在于:所述定焦镜头的总长TTL满足TTL/EFL<6，其中EFL为镜头的焦距值。
  10. 一种3CCD摄像机，其特征在于，包括如权利要求1-9中任一项所述的定焦镜头。
PCT/CN2018/098422 2017-08-10 2018-08-03 定焦镜头和包括该定焦镜头的3ccd摄像机 WO2019029436A1 (zh)

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