CN110441892B - Low-distortion miniaturized high-resolution fisheye lens optical system - Google Patents
Low-distortion miniaturized high-resolution fisheye lens optical system Download PDFInfo
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- CN110441892B CN110441892B CN201910712900.1A CN201910712900A CN110441892B CN 110441892 B CN110441892 B CN 110441892B CN 201910712900 A CN201910712900 A CN 201910712900A CN 110441892 B CN110441892 B CN 110441892B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 92
- 230000005499 meniscus Effects 0.000 claims abstract description 20
- 239000005308 flint glass Substances 0.000 claims description 15
- 229910052746 lanthanum Inorganic materials 0.000 claims description 15
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 4
- 102220616555 S-phase kinase-associated protein 2_E48R_mutation Human genes 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 description 11
- 230000004075 alteration Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/18—Optical 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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Abstract
The invention relates to a low-distortion miniaturized high-resolution fisheye lens optical system, which comprises a front lens group, a diaphragm, a rear lens group and an image plane, wherein the front lens group, the diaphragm, the rear lens group and the image plane are sequentially arranged from front to back along the incidence direction of light rays; the front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from front to back; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back; the fourth lens and the fifth lens form a double-cemented lens, the first lens is a meniscus negative focal power spherical lens, the second lens is a meniscus negative focal power spherical lens, the third lens is a meniscus positive focal power spherical lens, the fourth lens is a biconvex positive focal power spherical lens, the fifth lens is a meniscus negative focal power spherical lens, and the sixth lens is a meniscus positive focal power aspherical lens. The invention can realize the effect of low distortion through a simpler structure and smaller size.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a low-distortion miniaturized high-resolution fisheye lens optical system.
Background
The fisheye lens optical system has a field angle approaching or exceeding 180 degrees, can obtain ultra-large-range scenery imaging and is widely applied to the fields of security protection, monitoring and the like.
The fisheye lens optical system pursues performance indexes of ultra-large field of view, high resolution and light miniaturization, but most of the fisheye lens optical systems applicable to panoramic cameras have the defects of complex structure, large size and the like. With the improvement of the performance requirements of people on panoramic imaging images, besides high-definition imaging, low distortion of the full-picture images is required to be realized so as to adapt to the follow-up electronic image correction algorithm to obtain low-distortion images with better visual experience effects. However, the existing fisheye lens optical system has the defect of large distortion.
There is an urgent need in the market today for a low distortion miniaturized high resolution fisheye lens optical system capable of achieving low distortion effects with a simpler structure and smaller size.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-distortion miniaturized high-resolution fisheye lens optical system. Only one aspheric lens is adopted, so that the panoramic camera has the advantages of small lens quantity, excellent imaging image quality, compact structure, greatly reduced distortion of the whole picture and contribution to improving the application level of the panoramic camera optical system.
The invention solves the technical problems as follows: the low-distortion miniaturized high-resolution fisheye lens optical system comprises a front lens group, a diaphragm, a rear lens group and an image plane, wherein the front lens group, the diaphragm, the rear lens group and the image plane are sequentially arranged from front to back along the incidence direction of light rays;
the front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from front to back;
the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back;
the fourth lens and the fifth lens form a double-cemented lens, the first lens is a meniscus negative focal power spherical lens, the second lens is a meniscus negative focal power spherical lens, the third lens is a meniscus positive focal power spherical lens, the fourth lens is a biconvex positive focal power spherical lens, the fifth lens is a meniscus negative focal power spherical lens, and the sixth lens is a meniscus positive focal power aspheric lens.
As a further improvement of the above technical solution, the optical power of the front lens group is Φa, the optical power of the rear lens group is Φb, the optical power of the entire optical system is Φ, and the following relationships are satisfied among Φa, Φb and Φ:
-0.18≤φA/φ≤-0.12；
0.40≤φB/φ≤0.48。
as a further improvement of the above technical solution, an optical surface of the third lens close to the aperture is a first optical surface, an optical surface of the fourth lens close to the aperture is a second optical surface, a height value of an edge ray of an on-axis view field of the optical system on the first optical surface is h1, and a height value of an edge ray of an on-axis view field of the optical system on the second optical surface is h2, wherein a ratio of h1 to h2 satisfies:
0.92≤h1/h2≤0.98。
as a further improvement of the above technical solution, the center distance between the diaphragm and the third lens is L1, the center distance between the diaphragm and the fourth lens is L2, and the ratio of L1 to L2 satisfies:
0.52≤L1/L2≤0.75。
as a further improvement of the technical scheme, the first lens is made of lanthanum flint glass, the second lens is made of lanthanum flint glass, the third lens is made of lanthanum flint glass, the fourth lens is made of lanthanum flint glass, the fifth lens is made of lanthanum flint glass, and the sixth lens is made of E48R material.
As a further improvement of the above technical solution, the total optical power of the optical system is Φa1, the optical power of the first lens is Φa2, the optical power of the second lens is Φa3, the optical power of the third lens is Φa12, the combined optical power of the fourth lens and the fifth lens is Φb3, and the optical power of the sixth lens is Φb3, wherein Φa1, Φa2, Φa3, Φb12 and Φb3 satisfy the following relations:
-0.22≤φA1/φ≤-0.18；
-0.51≤φA2/φ≤-0.45；
0.28≤φA3/φ≤0.35；
0.25≤φB12/φ≤0.32；
0.20≤φB3/φ≤0.24。
as a further improvement of the above technical solution, the lens assembly further includes an optical filter, and the optical filter is disposed between the image plane and the rear lens group.
The beneficial effects of the invention are as follows: the length of the optical system is only 8.2mm, the size of the optical system is greatly shortened under the same index, the miniaturization design of the panoramic camera is facilitated, and the application scene of the panoramic camera is enriched; the imaging effect with small image distortion is realized through a simpler structure; an aspherical lens is adopted, so that aberration correction capability is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the invention, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic view of an optical path structure of an optical system according to the present invention;
FIG. 2 is a graph of the optical transfer function of the optical system of the present invention;
fig. 3 is a distortion profile of an optical system of the present invention over a full field of view.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. In addition, all connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to a connection structure that may be better formed by adding or subtracting connection aids depending on the particular implementation. The technical features in the invention can be interactively combined on the premise of no contradiction and conflict.
Embodiment 1, referring to fig. 1, proposes a low-distortion miniaturized high-resolution fisheye lens optical system, comprising a front lens set, a diaphragm 700, a rear lens set, and an image plane 800 sequentially arranged from front to back along a light incident direction;
the front lens group includes a first lens 100, a second lens 200, and a third lens 300 sequentially disposed from front to back;
the rear lens group includes a fourth lens 400, a fifth lens 500, and a sixth lens 600, which are sequentially disposed from front to rear;
the fourth lens 400 and the fifth lens 500 form a cemented doublet lens, the first lens 100 is a meniscus negative power spherical lens, the second lens 200 is a meniscus negative power spherical lens, the third lens 300 is a meniscus positive power spherical lens, the fourth lens 400 is a biconvex positive power spherical lens, the fifth lens 500 is a meniscus negative power spherical lens, and the sixth lens 600 is a meniscus positive power aspheric lens.
As a preferred embodiment of the present invention, the optical power of the front lens group is Φa, the optical power of the rear lens group is Φb, the optical power of the entire optical system is Φ, and the following relationships are satisfied among Φa, Φb and Φ:
-0.18≤φA/φ≤-0.12；
0.40≤φB/φ≤0.48。
as a preferred embodiment of the present disclosure, an optical surface of the third lens 300 near the diaphragm 700 is a first optical surface, an optical surface of the fourth lens 400 near the diaphragm 700 is a second optical surface, a height value of an edge ray of an on-axis view field of the optical system on the first optical surface is h1, and a height value of an edge ray of an on-axis view field of the optical system on the second optical surface is h2, where a ratio of h1 to h2 satisfies:
0.92≤h1/h2≤0.98。
as a preferred embodiment of the present embodiment, the center distance between the diaphragm 700 and the third lens 300 is L1, the center distance between the diaphragm 700 and the fourth lens 400 is L2, and the ratio of L1 to L2 satisfies:
0.52≤L1/L2≤0.75。
in a preferred embodiment of the present disclosure, the first lens 100 is made of lanthanum flint glass, the second lens 200 is made of lanthanum flint glass, the third lens 300 is made of lanthanum flint glass, the fourth lens 400 is made of lanthanum flint glass, the fifth lens 500 is made of lanthanum flint glass, and the sixth lens 600 is made of E48R material. The aspherical surface profile of the sixth lens 600 in this embodiment satisfies the following higher order aspherical sagittal equation:
wherein c is a curvature radius, y is a radial coordinate, k is a conic constant, and A-G are coefficients corresponding to different orders (the coefficients of different orders are parameters of a specific aspheric surface type), and the sagittal height Z of any position of the aspheric surface can be calculated by the above equation.
As a preferred embodiment of the present embodiment, the total optical power of the optical system is Φa1, the optical power of the first lens 100 is Φa2, the optical power of the second lens 200 is Φa3, the optical power of the third lens 300 is Φa3, the combined optical power of the fourth lens 400 and the fifth lens 500 is Φb12, the optical power of the sixth lens 600 is Φb3, and the following relationships are satisfied by Φa1, Φa2, Φa3, Φb12 and Φb3:
-0.22≤φA1/φ≤-0.18；
-0.51≤φA2/φ≤-0.45；
0.28≤φA3/φ≤0.35；
0.25≤φB12/φ≤0.32；
0.20≤φB3/φ≤0.24。
as a preferred embodiment of the present invention, the optical filter 900 is further included, and the optical filter 900 is disposed between the image plane 800 and the rear lens group. In this embodiment, the optical filter 900 is added between the image plane 800 and the rear lens group, so that a spectrum can be obtained in a desired range, and the obtained spectrum range is set to 436nm to 656nm in this embodiment.
The specific parameters of the low-distortion miniaturized high-resolution fisheye lens optical system are as follows:
focal length 0.92mm; the relative aperture D/f is 1/2.2; the angle of view is 210 °; the total length of the optical system is 8.2mm, and the rear working distance (the distance from the sixth lens 600 to the image plane 800) is 1.80mm.
The optical system adopts a reverse-distance optical structure, and because the imaging view field reaches over 210 degrees, in order to reduce the view field aberration such as astigmatism and field curvature caused by the oversized view field, the front lens group adopts two lenses (the first lens 100 and the second lens 200) with negative focal power at the forefront end to obtain a larger inverse value of the magnification of the principal ray, thereby reducing the aberration correction pressure of the rear lens group.
The invention focuses on realizing a highly compact miniaturized design and a low-distortion design on the premise of ensuring high image quality, thereby carrying out corresponding innovative design. First, when the optical system length is shortened, the optical power of each group of lenses increases, and various aberrations such as spherical aberration, coma, astigmatism, and distortion are rapidly increased, resulting in degradation of the image quality of the optical system. In order to realize compact design of the ultra-wide angle optical system, the invention performs perfect correction on various aberrations through reasonable distribution of focal power and optimal selection of optical materials, thereby shortening the size of the optical system and simultaneously obtaining high imaging quality.
Secondly, the invention researches a correction method of distortion under an ultra-large view field, the focal power of the front lens group and the rear lens group is distributed in a larger asymmetric way, the front lens group adopts a negative focal power type, the rear lens group adopts a larger positive focal power type, and the distortion aberration caused by infinite imaging is corrected on the basis.
In the invention, as shown in figure 2, the average transfer function value of the full field of view reaches 0.25 at 360lp/mm, thus ensuring the resolution of the image quality at high resolution. As shown in figure 3, the distortion of the full view field is not more than 10%, so that the compression of the edge image is reduced, the low-distortion image effect is realized by adopting a subsequent correction algorithm, and the imaging quality of the edge image is improved.
The length of the optical system is only 8.2mm, the size of the optical system is greatly shortened under the same index, the miniaturization design of the panoramic camera is facilitated, and the application scene of the panoramic camera is enriched; the average value of the full-view field transfer function reaches 0.25@360lp/mm, so that excellent imaging quality is realized; the distortion of the full field of view is not more than 10%, and the imaging effect with small image distortion is realized; the adoption of one plastic aspherical lens (sixth lens 600) improves aberration correction capability, and has low cost compared with a glass aspherical lens, thereby being beneficial to mass production.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present invention, and these are intended to be included in the scope of the present invention as defined in the appended claims.
Claims (4)
1. The low-distortion miniaturized high-resolution fisheye lens optical system is characterized by comprising a front lens group, a diaphragm, a rear lens group and an image plane which are sequentially arranged from front to back along the incidence direction of light rays;
the front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from front to back;
the rear lens group comprises a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from front to back;
the fourth lens and the fifth lens form a double-cemented lens, the first lens is a meniscus negative focal power spherical lens, the second lens is a meniscus negative focal power spherical lens, the third lens is a meniscus positive focal power spherical lens, the fourth lens is a biconvex positive focal power spherical lens, the fifth lens is a meniscus negative focal power spherical lens, and the sixth lens is a meniscus positive focal power aspheric lens;
the focal power of the front lens group is phi A, the focal power of the rear lens group is phi B, the focal power of the whole optical system is phi, and the following relations among phi A, phi B and phi are satisfied:
-0.18≤φA/φ≤-0.12；
0.40≤φB/φ≤0.48；
the total focal power of the optical system is phi, the focal power of the first lens is phi A1, the focal power of the second lens is phi A2, the focal power of the third lens is phi A3, the combined focal power of the fourth lens and the fifth lens is phi B12, the focal power of the sixth lens is phi B3, and the following relations are satisfied by phi, phi A1, phi A2, phi A3 and phi B12:
-0.22≤φA1/φ≤-0.18；
-0.51≤φA2/φ≤-0.45；
0.28≤φA3/φ≤0.35；
0.25≤φB12/φ≤0.32；
0.20≤φB3/φ≤0.24；
the low-distortion miniaturized high-resolution fisheye lens optical system further comprises an optical filter, and the optical filter is arranged between the image plane and the rear lens group.
2. The low-distortion miniaturized high-resolution fisheye lens optical system of claim 1, wherein: the optical surface of the third lens, which is close to the diaphragm, is a first optical surface, the optical surface of the fourth lens, which is close to the diaphragm, is a second optical surface, the height value of the marginal ray of the on-axis view field of the optical system on the first optical surface is h1, the height value of the marginal ray of the on-axis view field of the optical system on the second optical surface is h2, and the ratio of h1 to h2 satisfies:
0.92≤h1/ h2≤0.98。
3. the low-distortion miniaturized high-resolution fisheye lens optical system of claim 1, wherein: the center distance between the diaphragm and the third lens is L1, the center distance between the diaphragm and the fourth lens is L2, and the ratio of L1 to L2 satisfies:
0.52≤L1/ L2≤0.75。
4. the low-distortion miniaturized high-resolution fisheye lens optical system of claim 1, wherein: the first lens is made of lanthanum flint glass, the second lens is made of lanthanum flint glass, the third lens is made of lanthanum flint glass, the fourth lens is made of lanthanum flint glass, the fifth lens is made of lanthanum flint glass, and the sixth lens is made of E48R material.
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| CN115097597B (en) * | 2022-06-09 | 2024-03-12 | 江西特莱斯光学有限公司 | Glass-plastic mixed thermal drift stable fish-eye lens |
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