CN115437112A - Large-aperture panoramic optical imaging system - Google Patents
Large-aperture panoramic optical imaging system Download PDFInfo
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- CN115437112A CN115437112A CN202211017263.4A CN202211017263A CN115437112A CN 115437112 A CN115437112 A CN 115437112A CN 202211017263 A CN202211017263 A CN 202211017263A CN 115437112 A CN115437112 A CN 115437112A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 62
- 239000000523 sample Substances 0.000 claims 1
- 238000003384 imaging method Methods 0.000 abstract description 21
- 238000012545 processing Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
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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
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised 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 five or more 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
-
- 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
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention relates to a large-aperture panoramic optical imaging system which sequentially comprises a reflector, a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object space to an image space; the aperture diaphragm is positioned between the third lens and the fourth lens, and the fourth lens and the fifth lens are glued to form a double-cemented lens; the optical surfaces of the reflector and the eighth lens facing the image space are aspheric surfaces, and the optical surfaces of the rest lenses are spherical surfaces. The catadioptric panoramic optical imaging system has the characteristics of large aperture, wide field range, good image surface uniformity, good imaging quality, relatively simple structure, convenience in processing and installation.
Description
Technical Field
The invention relates to a panoramic optical imaging technology in the photoelectric industry, in particular to a large-aperture catadioptric panoramic optical imaging system.
Background
With the rapid development of modern science and technology, the fish-eye lens system has large field angle range imaging which cannot be achieved by a conventional optical system, so that the fish-eye lens system is widely applied to the fields of robot navigation, scene monitoring, target recognition and the like. Such optical systems tend to have relatively large aberrations, especially in large aperture imaging situations, and therefore such systems require one or more negative meniscus lenses and multiple refractive lenses to compress the field angle and correct for aberrations. However, the catadioptric imaging system is often composed of a mirror and a set of refractive lenses, which greatly reduces the complexity of the system structure, making it more and more popular for use in various fields. The catadioptric panoramic optical imaging system collects and compresses light rays incident in the horizontal direction by using a reflector, and transfers the light rays into a group of refraction lens groups at the back, so that panoramic images at a certain angle in the horizontal direction and the vertical direction can be acquired in real time.
Disclosure of Invention
The invention aims to solve the technical problem that the existing panoramic imaging system is complex in structure and poor in imaging performance, and provides a large-aperture catadioptric panoramic optical imaging system which is designed by applying a reflector and a group of refraction lens groups. For a catadioptric panoramic imaging system, although its optical elements are arranged axisymmetrically, light rays strike the surface of the optical elements at a large incident angle, causing it to be inconsistent with the imaging characteristics of a paraxial optical system, having a plane-symmetric optical system imaging performance, so that the design of such a system cannot be guided within the seidel aberration analysis method. Therefore, the method is based on the sixth-order wave aberration theory of the ultra-large field-of-view optical system to analyze the aberration of the half-folded reflective panoramic imaging system and establish a system image quality evaluation function to correct the aberration of the system, so that a system with good imaging quality is obtained, and a means is provided for the aberration optimization of the system. The catadioptric panoramic optical imaging system has the characteristics of large aperture, wide field range, good image surface uniformity, good imaging quality, relatively simple structure, convenience in processing and installation.
The invention adopts the following technical scheme: a large-aperture panoramic optical imaging system sequentially comprises a reflector, a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side; the aperture diaphragm is positioned between the third lens and the fourth lens, and the fourth lens and the fifth lens are glued to form a double-cemented lens; the optical surfaces of the reflector and the eighth lens facing the image space are aspheric surfaces, and the optical surfaces of the rest lenses are spherical surfaces.
Preferably, the full field angle of the optical system is 120 degrees, the total focal length is 0.33mm, the F number is 2.6, the total length is 128.96mm, the detection wavelength range is 400nm-700nm, and the main wavelength is 586.7nm.
Preferably, aspheric surface type coefficients of the optical surface of the mirror and the optical surface of the eighth lens facing the image side satisfy a conic surface equation: x is the number of 2 +y 2 ＝a 1 z+a 2 z 2
In the above formula, the parameters x, y, z are coordinates of an arbitrary point on the optical surface, a 1 ＝2R 0 ，R 0 Denotes the radius of curvature at the apex of the aspherical profile curve of the optical surface of the mirror or lens, a 2 Is the surface form factor of the optical surface, wherein a 2 ≠-1。
Preferably, the surface type coefficients of the optical surface of the reflector and the optical surface of the eighth lens facing the image side are 1.88 and-65.25 respectively.
Preferably, the first lens, the second lens and the third lens have the same refractive index.
Preferably, the refractive index of the fourth lens is the smallest of all the lenses.
Preferably, the distance between the first lens and the reflector is the maximum of the distances of all adjacent optical structures.
The invention has the following beneficial effects: in the invention, the reflector M1 is used for collecting and compressing the light rays incident in the horizontal direction, so that the effect of compressing the field angle of an object space is achieved, the field angle of the light rays passing through the reflector M1 can be received by the refraction lens group, and the requirements of the imaging system on a large field angle and large-aperture shooting are ensured. The imaging system uses fewer lenses, so that the imaging system has low processing cost in the design process and is convenient to install. In the imaging system, the optical surface of the mirror M1 and the image-side optical surface of the 8 th refractive lens L8 are aspheric, so that aberrations occurring in the system at a large aperture and a large angle of view are effectively corrected. The catadioptric panoramic optical imaging system has the characteristics of large aperture, wide field range, good image surface uniformity, good imaging quality, relatively simple structure, convenience in processing and installation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of an optical structure according to the present invention;
FIG. 2 is a graph of the Modulation Transfer Function (MTF) of the present invention;
FIG. 3 is a relative illuminance diagram according to the present invention;
fig. 4 is a light path diagram of the present invention.
In the figure: 1-a mirror; 2-a first lens; 3-a second lens; 4-a third lens; 5-aperture diaphragm; 6-a fourth lens; 7-a fifth lens; 8-a sixth lens; 9-a seventh lens; 10-eighth lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
Examples
The following are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the following examples, and all technical solutions belonging to the idea of the present invention belong to the scope of the present invention.
Referring to the attached drawing 1 of the specification, the large-aperture panoramic optical imaging system sequentially comprises a reflector 1, a first lens 2, a second lens 3, a third lens 4, an aperture diaphragm 5, a fourth lens 6, a fifth lens 7, a sixth lens 8, a seventh lens 9 and an eighth lens 10 from an object side to an image side along a light propagation direction. The aperture diaphragm is positioned between the third lens 4 and the fourth lens 6, and the fourth lens 6 and the fifth lens 7 form a double-cemented lens. The optical surface of the reflector 1 and the image-side optical surface of the eighth lens 10 are aspheric, and the optical surfaces of the other lenses are spherical. The full field angle of the large-aperture panoramic optical imaging system is 120 degrees, the total focal length is 0.33mm, the F number is 2.6, the total length is 128.96mm, the detectable wavelength range is 400nm-700nm, and the main wavelength is 586.7nm.
The materials of the reflector 1, the first lens 2, the second lens 3, the third lens 4, the fourth lens 6, the fifth lens 7, the sixth lens 8, the seventh lens 9 and the eighth lens 10 are MIRROR (N = 1.0000), N-PSK53A (N = 1.6180), BK7 (N = 1.5168), PSK52 (N = 1.6031), PSK54 (N = 1.5860) and PSK54 (N = 1.5860), respectively; where n is the refractive index.
The aspheric surface type coefficient of the optical surface of the reflector or the lens satisfies a conic surface equation:
x 2 +y 2 ＝a 1 z+a 2 z 2 ；
in the above formula, the parameters x, y, z are coordinates of an arbitrary point on the optical surface, a 1 ＝2R 0 ，R 0 Denotes the radius of curvature at the apex of the aspherical profile curve of the optical surface of the mirror or lens, a 2 Is a coefficient for determining the surface type of the optical surface; when a is 2 When not equal to-1, the optical surface is aspheric, and the optical surface is specifically classified as follows:
when a is 2 <-1、-1<a 2 <0、a 2 =0 and a 2 >When 0, the surface types of the optical surfaces are respectively a flat ellipsoid, a long ellipsoid, a paraboloid and a hyperboloid; if a is 2 And =1, the optical surface is spherical.
The surface type coefficients of the optical surface of the reflector 1 and the optical surface of the eighth lens 10 facing the image side are respectively 1.88 and-65.25, and the surface type coefficients of the optical surfaces of the rest of the refraction lenses are all-1.
The optical surface of the reflector 1 and the image-oriented optical surface of the eighth lens 10 are both aspheric, and the fourth lens 6 and the fifth lens 7 form a double-cemented lens, which plays a very important role in correcting the aberration of the lens.
Fig. 2 and fig. 3 are a Modulation Transfer Function (MTF) curve and a relative luminance graph of a large aperture panoramic optical imaging system, respectively. The imaging quality of the catadioptric panoramic imaging system is very high as can be obtained from fig. 2; from fig. 3, it can be obtained that the relative illumination of the catadioptric panoramic imaging system is very high, and meets the design requirements.
The structural parameters of a large aperture panoramic optical imaging system described in this embodiment are shown in table 1 (the direction is from the object side to the image side along the light propagation direction):
TABLE 1 optical structure parameters of a large aperture panoramic optical imaging system
In the above table, S1 is an optical surface of the reflector 1 along the incident direction of light from the object plane to the image plane; s2 and S3 are optical surfaces of the first lens 2 facing to the object side and the image side; s4 and S5 are optical surfaces facing the object side and the image side of the second lens 3; s6 and S7 are the optical surfaces of the third lens 4 facing to the object side and the image side; s8 and S9 are optical surfaces of the fourth lens 6 facing to the object side and the image side; s9 and S10 are object-side and image-side optical surfaces of the fifth lens element 7; s11 and S12 are object-side and image-side optical surfaces of the sixth lens element 8; s13 and S14 are object-side and image-side optical surfaces of the seventh lens element 9; s15 and S16 are object-side and image-side optical surfaces of the eighth lens element 10. Here, the fourth lens 6 and the fifth lens 7 constitute a double cemented lens, and therefore S9 is a cemented optical surface of the fourth lens 6 and the fifth lens 7. As can be seen from the above table, the distance between the first lens 2 and the reflector 1 is the farthest in each optical structure, and the distance between the optical surface S2 facing the object and the reflector 1 is 50.12mm. The first lens 2, the second lens 3, and the third lens 4 close to the object have the same refractive index and have the highest refractive index, and the fourth lens 6 on the aperture stop side has the smallest refractive index among all the lenses.
In summary, by means of the technical scheme of the invention, the catadioptric panoramic optical imaging system has the characteristics of large aperture, wide field range, good image surface uniformity, good imaging quality, relatively simple structure, convenience in processing and installation.
Claims (7)
1. A large-aperture panoramic optical imaging system is characterized by comprising a reflector, a first lens, a second lens, a third lens, an aperture diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object space to an image space in sequence; the aperture diaphragm is positioned between the third lens and the fourth lens, and the fourth lens and the fifth lens are glued to form a double-cemented lens; the optical surfaces of the reflector and the eighth lens facing the image space are aspheric surfaces, and the optical surfaces of the rest lenses are spherical surfaces.
2. The large aperture panoramic optical imaging system of claim 1, wherein the optical system has a full field angle of 120 °, a total focal length of 0.33mm, an f-number of 2.6, a total length of 128.96mm, a probe wavelength range of 400nm to 700nm, and a dominant wavelength of 586.7nm.
3. The large-aperture panoramic optical imaging system according to claim 1, wherein aspheric surface coefficients of the optical surfaces of the reflector and the eighth lens facing the image side satisfy a conic equation: x is the number of 2 +y 2 ＝a 1 z+a 2 z 2
In the above formula, the parameters x, y, z are coordinates of an arbitrary point on the optical surface, a 1 ＝2R 0 ，R 0 Denotes the radius of curvature at the apex of the aspherical profile curve of the optical surface of the mirror or lens, a 2 Is the surface form factor of the optical surface, wherein a 2 ≠-1。
4. The large-aperture panoramic optical imaging system of claim 3, wherein the surface type coefficients of the optical surface of the reflector and the optical surface of the eighth lens facing the image side are 1.88 and-65.25, respectively.
5. The large aperture panoramic optical imaging system of claim 1, wherein the first, second and third lenses have the same refractive index.
6. The large aperture panoramic optical imaging system of claim 1, wherein the refractive index of the fourth lens is the smallest of all lenses.
7. The large aperture panoramic optical imaging system of claim 1, wherein the distance between the first lens and the mirror is the maximum of all adjacent optical structure distances.
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| CN202211017263.4A CN115437112A (en) | 2022-08-23 | 2022-08-23 | Large-aperture panoramic optical imaging system |
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| CN202211017263.4A CN115437112A (en) | 2022-08-23 | 2022-08-23 | Large-aperture panoramic optical imaging system |
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