CN108873258B - Super wide angle, large aperture fisheye lens optical system - Google Patents

Super wide angle, large aperture fisheye lens optical system Download PDF

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CN108873258B
CN108873258B CN201810780470.2A CN201810780470A CN108873258B CN 108873258 B CN108873258 B CN 108873258B CN 201810780470 A CN201810780470 A CN 201810780470A CN 108873258 B CN108873258 B CN 108873258B
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lens
focal power
optical system
negative focal
negative
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CN108873258A (en
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曹一青
沈志娟
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Putian University
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Putian University
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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
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

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

The invention relates to an ultra-wide-angle and large-aperture fisheye lens optical system, which sequentially comprises a front group optical system with negative focal power and a rear group optical system with positive focal power from an object side to an image side along the direction of an optical axis; the front group optical system comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with negative focal power in sequence from an object side to an image side along the direction of an optical axis; the rear group optical system comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, an aperture diaphragm, a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a filter in sequence from the object side to the image side along the direction of an optical axis. The invention has the advantages of good image surface uniformity, high imaging quality, wide field angle range and receiving aperture, compact structure, easy processing and installation, and the like.

Description

Super wide angle, large aperture fisheye lens optical system
Technical Field
The invention relates to the field of optical imaging systems, in particular to an ultra-wide-angle and large-aperture fisheye lens optical system.
Background
With the development of science and technology, not only high-resolution images but also a large field of view are required in more and more fields. An ultra-wide-angle optical imaging system, such as a fisheye lens optical system, is a special optical system, has a very large imaging field angle, can achieve full-airspace accommodation and full-time-domain real-time information acquisition, and achieves functions which cannot be achieved by a common imaging system. The fish-eye lens can obtain a field range which cannot be reached by a general optical system, so that the fish-eye lens has wide application in a plurality of fields, and gradually expands the fields of engineering measurement, safety monitoring, national defense and military, dome screen movies and the like from special photography.
For the fisheye lens optical system, the fisheye lens optical system can be divided into a front group optical system and a rear group optical system; the front group of optical systems generally consists of a plurality of negative meniscus lenses and plays a role in compressing the field angle; the rear group optical system is composed of a conventional optical system. In a fisheye lens optical system, the field angle of light rays emitted from an object point with a large field angle and striking the surface of an optical element is very large, so that the aberration of such an optical system is often severe; in addition, in the applications in various fields, in order to obtain clearer images, the medium and small apertures cannot meet the requirements, so that large aperture imaging is pursued, which makes the design of such optical systems more complicated. The seidel aberration theory can only analyze the aberration under the condition of an axisymmetric optical system (the field angle is small), and cannot be used for analyzing and optimally designing the aberration of the ultra-wide angle optical system.
Disclosure of Invention
In view of the above, the present invention provides an ultra-wide-angle and large-aperture fisheye lens optical system, which has the advantages of good image plane uniformity, high imaging quality, wide field angle range, compact structure, easy processing and installation, and the like.
The invention is realized by adopting the following scheme: an ultra-wide-angle and large-aperture fish-eye lens optical system comprises a front group optical system with negative focal power and a rear group optical system with positive focal power in sequence from an object side to an image side along the direction of an optical axis;
the front group optical system comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with negative focal power in sequence from an object side to an image side along the direction of an optical axis;
the rear group optical system comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, an aperture diaphragm, a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and a filter in sequence from the object side to the image side along the direction of an optical axis.
Further, the seventh lens and the eighth lens are combined to form a double cemented lens, the ninth lens and the tenth lens are combined to form a double cemented lens, and the eleventh lens and the twelfth lens are combined to form a double cemented lens.
Furthermore, the field angle of the lens of the optical system is 160 degrees, the total focal length is 3.212mm, the F number is 2.8, the total length is 102.144mm, the detectable wavelength range is 400nm-700nm, and the main wavelength is 586.7 nm.
Further, the materials of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth lenses are N-BK7(N =1.5168), N-BK7(N =1.5168), N-BK7(N =1.5168), SK51(N =1.6209), SF10(N =1.1.7282), SF12(N =1.1.6483), D263TECO (N =1.5233), LAFN28(N =1.7731), K3(N =1.5182), P-LASF47(N =1.8061), SF1(N =1.7174), N-BK 2(N =1.5168), respectively.
Further, the material of the optical filter is N-BK7(N = 1.5168).
Preferably, the aperture diaphragm is located between the eighth lens and the ninth lens, and the optical filter is located between the twelfth lens and the image plane, and can be replaced at any time as required to play a role in filtering light.
The invention provides the technical scheme for optimizing various aberrations in a targeted manner after analyzing and analyzing various aberrations of the optical system by using a high-order aberration theory and a design method of the super-large field optical system.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention perfectly obtains the ultra-wide-angle and large-aperture fisheye lens optical system with the characteristics of good image surface uniformity, good imaging quality and the like.
2. The invention uses the double-cemented lens for many times, selects common low-price materials and does not use the aspheric surface design, thereby relatively reducing the processing cost.
Drawings
FIG. 1 is a schematic diagram of an optical system according to the present invention.
Fig. 2 is a MTF graph of an ultra-wide-angle, large-aperture fisheye lens optical system according to an embodiment of the invention.
Fig. 3 is a relative illuminance diagram of an optical system of an ultra-wide-angle and large-aperture fisheye lens according to an embodiment of the invention.
Fig. 4 is a distortion curve diagram of an optical system of an ultra-wide-angle large-aperture fisheye lens according to an embodiment of the invention.
Fig. 5 is an optical path diagram of an optical system of an ultra-wide-angle large-aperture fisheye lens according to an embodiment of the invention.
In the figure, 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a fourth lens, 5 is a fifth lens, 6 is a sixth lens, 7 is a seventh lens, 8 is an eighth lens, 9 is a ninth lens, 10 is a tenth lens, 11 is an eleventh lens, and 12 is a twelfth lens.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 and 5, the present embodiment provides an ultra-wide-angle, large-aperture fisheye lens optical system, which includes, in order from the object side to the image side along the direction of the optical axis, a front group optical system having negative optical power and a rear group optical system having positive optical power;
the front group optical system comprises a first lens 1 with negative focal power, a second lens 2 with negative focal power and a third lens 3 with negative focal power in sequence from an object side to an image side along the direction of an optical axis;
the rear group optical system includes, in order from the object side to the image side in the direction along the optical axis, a fourth lens 4 with negative power, a fifth lens 5 with positive power, a sixth lens 6 with negative power, a seventh lens 7 with positive power, an eighth lens 8 with negative power, an aperture stop, a ninth lens 9 with positive power, a tenth lens 10 with negative power, an eleventh lens 11 with negative power, a twelfth lens 12 with positive power, and a filter.
In this embodiment, the seventh lens and the eighth lens are combined to form a double cemented lens, the ninth lens and the tenth lens are combined to form a double cemented lens, and the eleventh lens and the twelfth lens are combined to form a double cemented lens.
In this embodiment, the angle of view of the lens of the optical system is 160 °, the total focal length is 3.212mm, the F number is 2.8, the total length is 102.144mm, the detectable wavelength range is 400nm to 700nm, and the dominant wavelength is 586.7 nm.
In the present embodiment, the materials of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, and twelfth lenses are N-BK7(N =1.5168), N-BK7(N =1.5168), N-BK7(N =1.5168), SK51(N =1.6209), SF10(N =1.1.7282), SF12(N =1.1.6483), D263TECO (N =1.5233), LAFN28(N =1.7731), K3(N =1.5182), P-LASF47(N =1.8061), SF1(N =1.7174), N-BK 2(N =1.5168), respectively.
In the present embodiment, the material of the optical filter is N-BK7(N = 1.5168).
Preferably, in this embodiment, the aperture stop is located between the eighth lens and the ninth lens, and the optical filter is located between the twelfth lens and the image plane, and can be replaced at any time as required to perform a filtering function.
The embodiment specifically provides the technical scheme for optimizing various aberrations in a targeted manner after analyzing and analyzing various aberrations of the optical system by using a high-order aberration theory and a design method of the super-large field optical system.
In particular, in this embodiment, the first lens has a negative power, and the optical surfaces facing the object and the image are convex toward the object, the second lens has a negative power, and the optical surfaces facing the object and the image are convex toward the object, the third lens has a negative power, and the optical surfaces facing the object are convex toward the image and the optical surfaces facing the image are convex toward the object, the fourth lens has a negative power, and the optical surfaces facing the object are convex toward the image and the optical surfaces facing the image are convex toward the object, the fifth lens has a positive power, and the optical surfaces facing the object are convex toward the object and the optical surfaces facing the image are convex toward the image, the sixth lens has a negative power, and the optical surfaces facing the object and the image are convex toward the object, and the seventh lens has a positive power, and the optical surfaces facing the object are convex toward the object and the optical surfaces facing the image, the eighth lens has negative focal power, the optical surfaces facing the object space and the image space are convex towards the image space, and form a double cemented lens with the seventh lens group, the ninth lens has positive focal power, the optical surfaces facing the object space are convex towards the object space and the optical surfaces facing the image space are convex towards the image space, the tenth lens has positive focal power, the optical surfaces facing the object space and the image space are convex towards the image space, and form a double cemented lens with the ninth lens group, the eleventh lens has negative focal power, the optical surfaces facing the object space and the image space are convex towards the object space, the twelfth lens has positive focal power, the optical surfaces facing the object space are convex towards the object space and the optical surfaces facing the image space, and form a double cemented lens with the twelfth lens group. The aperture diaphragm is positioned between the eighth lens and the ninth lens, plays a role in adjusting the width of an imaging light beam, is similar to an aperture in a camera, and the optical filter is positioned between the twelfth lens and an image plane, can filter specific wavelengths and can be replaced according to actual needs.
The structural parameters of the optical system of the ultra-wide-angle and large-aperture fish-eye lens of the embodiment are shown in table 1.
TABLE 1
Optical surface Radius (mm) Thickness (mm) Refractive index Material
1 50.127 0.966 1.5168 N-BK7
2 12.970 11.086
3 49.505 0.955 1.5168 N-BK7
4 14.597 4.585
5 -3915.982 0.987 1.5168 N-BK7
6 20.170 24.794
7 -20.854 0.960 1.6209 SK51
8 15.562 0.558
9 16.653 2.982 1.7282 SF10
10 -41.784 7.475
11 26.765 5.861 1.6483 SF12
12 8.556 0.717
13 7.777 5.545 1.5233 D263TECO
14 -11.175 0.970 1.7731 LAFN28
15 -47.147 0.306
16 (aperture diaphragm) Infinite number of elements 2.987
17 75.473 3.605 1.5182 K3
18 -5.713 1.233 1.8061 P-LASF47
19 -16.676 0.328
20 30.011 0.954 1.7174 SF1
21 14.732 3.750 1.5168 N-BK7
22 -13.330 1.484
23 Infinite number of elements 1.212 1.5168 N-BK7
24 Infinite number of elements 17.844
25 (image plane) Infinite number of elements
In this embodiment, fig. 2, fig. 3 and fig. 4 are MTF curves, relative luminances and distortion graphs of an ultra-wide-angle and large-aperture fish-eye lens optical system, respectively. From fig. 2, fig. 3 and fig. 4, it can be obtained that the optical system of the ultra-wide-angle and large-aperture fish-eye lens claimed in the present embodiment has the characteristics of high imaging quality, various aberration corrections to a very good level, high contrast and very small distortion.
By means of the technical scheme of the embodiment, the uniformity of the image surface of the lens is better, the imaging quality is higher, the structure is compact, and the lens is more convenient to process and install.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (3)

1. The utility model provides an ultra wide angle, large aperture fisheye lens optical system which characterized in that: the optical system comprises a front group optical system with negative focal power and a rear group optical system with positive focal power in sequence from the object side to the image side along the direction of an optical axis;
the front group optical system comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with negative focal power in sequence from an object side to an image side along the direction of an optical axis;
the rear group optical system comprises a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, an aperture diaphragm, a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with negative focal power, a twelfth lens with positive focal power and an optical filter in sequence from the object side to the image side along the direction of an optical axis;
the seventh lens and the eighth lens are combined into a double cemented lens, the ninth lens and the tenth lens are combined into a double cemented lens, and the eleventh lens and the twelfth lens are combined into a double cemented lens;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens are respectively made of N-BK7, N-BK7, N-BK7, SK51, SF10, SF12, D263TECO, LAFN28, K3, P-LASF47, SF1 and N-BK 7;
wherein, all lenses do not adopt aspheric surface design.
2. An ultra-wide angle, large aperture fish-eye lens optical system as claimed in claim 1, wherein: the field angle of a lens of the optical system is 160 degrees, the total focal length is 3.212mm, the F number is 2.8, the total length is 102.144mm, the detectable wavelength range is 400nm-700nm, and the main wavelength is 586.7 nm.
3. An ultra-wide angle, large aperture fish-eye lens optical system as claimed in claim 1, wherein: the material of the optical filter is N-BK 7.
CN201810780470.2A 2018-07-17 2018-07-17 Super wide angle, large aperture fisheye lens optical system Active CN108873258B (en)

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CN110596874A (en) * 2019-09-02 2019-12-20 上饶市奥尼光电科技有限公司 Continuous zooming fisheye lens of digital camera
CN111308674A (en) * 2020-02-27 2020-06-19 福州思贝克光学科技有限公司 Large wide-angle fisheye lens optical system and lens
CN111880292B (en) * 2020-06-20 2023-08-22 广东弘景光电科技股份有限公司 Small-volume fisheye camera module with ultra-wide angle, ultra-high pixel and low chromatic aberration
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CN114460716B (en) * 2022-01-11 2023-10-20 上海大学 Fisheye lens comprising two aspherical lenses
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