CN114460716A - Fisheye lens comprising two aspherical lenses - Google Patents
Fisheye lens comprising two aspherical lenses Download PDFInfo
- Publication number
- CN114460716A CN114460716A CN202210026993.4A CN202210026993A CN114460716A CN 114460716 A CN114460716 A CN 114460716A CN 202210026993 A CN202210026993 A CN 202210026993A CN 114460716 A CN114460716 A CN 114460716A
- Authority
- CN
- China
- Prior art keywords
- lens
- convex surfaces
- biconvex
- optical
- convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G02B13/06—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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a fish-eye lens comprising two aspheric lenses, wherein an optical system consists of 12 lenses, the system is sequentially provided with a front light group, an aperture diaphragm and a rear light group along an optical axis from an object space to an image space, and the front light group consists of three front lenses with convex surfaces facing the object space, a first biconcave lens, a lens with convex surfaces facing the object space, a first biconvex lens, a second biconvex lens and a double cemented lens formed by a lens with convex surfaces facing the image space; the aperture diaphragm is a thin metal wafer with a hole at the center and limits the size of the clear aperture; the rear light group comprises a double-cemented lens consisting of a third biconvex lens and a second lens with the convex surface facing the image space, and a double-cemented lens consisting of a second biconcave lens and a fourth biconvex lens. The optical system can realize the maximum working visual angle of 220 degrees, the receiving aperture can reach F/2.8, and the focal length is 3.878 mm; and the system has good image surface illumination uniformity, excellent imaging performance, simple and compact structure and easy processing.
Description
Technical Field
The invention relates to an optical system, in particular to a large-relative-aperture fisheye lens comprising two aspheric lenses, which is applied to the technical field of imaging of an optical system with an ultra-large visual field.
Background
The fisheye lens is an optical system with a large field angle and a large aperture, and the full field angle of the fisheye lens can reach more than 180 degrees. The fish-eye lens can obtain all optical information in a hemispherical space or even a hyper-hemispherical space field of view without rotating, so that the fish-eye lens has wide application in fields of safety monitoring, unmanned driving, panoramic photography, military and national defense and the like.
However, in the working environment, the light beam emitted from the object point enters the optical system at a large incident angle, and after the glancing incident light beam is imaged by the optical system, the focusing positions and wavefront parameters in the meridional and sagittal planes may be completely inconsistent, the shape of the wavefront will deviate seriously from the spherical surface, and the optical system has the imaging characteristic of a plane-symmetric optical system, so that the seidel theory is not suitable for the aberration analysis of the system. Therefore, the particularity and complexity of the structure of the fisheye lens itself make the design of the fisheye lens very difficult, and the imaging performance is also difficult to control, which is a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to overcome the defects in the prior art, and provides a fisheye lens comprising two aspheric lenses, on the basis of a developed super-large field aberration theory and a design method, through carrying out optimization design on the fisheye lens and combining with the research of an imaging quality evaluation function of a super-large field optical system, the fisheye lens is found to have the characteristics that the total aberration of the system is changed violently due to the change of some optical surfaces along with the aspheric coefficients in the imaging process, and the influence of the fisheye lens as an aspheric surface on the imaging quality of the system is obvious and far greater than the contribution of other optical surfaces. Therefore, the invention develops a novel fisheye lens system, the surface of an optical element sensitive to the aspheric coefficient is used as an aspheric surface to be optimized, and the obtained optical system has good image surface uniformity, good imaging quality, reliable performance, compact structure and easy processing.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a fish-eye lens comprising two aspheric lenses comprises 12 lenses, a front light group, an aperture diaphragm and a rear light group are sequentially arranged from an object space to an image space along an optical axis, wherein the front light group consists of three front lenses with convex surfaces facing the object space, a first biconcave lens, a lens with convex surfaces facing the object space, a first biconvex lens, a second biconvex lens and a double cemented lens formed by lenses with convex surfaces facing the image space; the second biconvex lens and the first biconvex lens face the image side to form a biconjugated lens; the first biconcave lens is a fourth lens, the lenses with convex surfaces facing the object space are fifth lenses, the first biconvex lens is a sixth lens, the second biconvex lens is a seventh lens, and the lenses with convex surfaces facing the image space are eighth lenses;
the aperture diaphragm is a thin metal wafer with a hole at the center, and the size of the light-transmitting aperture is limited;
the rear light group comprises a double-cemented lens consisting of a third biconvex lens and a second lens with the convex surface facing the image space, and a double-cemented lens consisting of a second biconcave lens and a fourth biconvex lens; the third biconvex lens is a ninth lens, the lenses with the convex surfaces facing the image space of the second biconvex lens are tenth lenses, the second biconcave lens is an eleventh lens, and the fourth biconvex lens is a twelfth lens;
the optical surfaces of all the lenses of the rear light group are spherical surfaces; the front optical surface of the lens with the rear optical surface and the convex surface of the first biconcave lens facing the object space in the front light group is a conic surface, the rear optical surface of the lens with the front optical surface and the convex surface of the first biconcave lens facing the object space is a spherical surface, and the optical surfaces of the other lenses of the front light group are spherical surfaces.
Preferably, when the rear optical surface of the first biconcave lens and the front optical surface of the lens with the convex surface facing the object side both adopt conic surfaces, the aspheric surface coefficients of the rear optical surface of the first biconcave lens and the front optical surface of the lens with the convex surface facing the object side both satisfy the following equation:
x′2+y′2＝a1z′+a2z′2
in the equation, a1＝2R0，R0Denotes a radius of curvature at the apex of an aspherical surface-type curve of the optical surface of the lens, a2Is to determine the coefficients of the conic surface type, i.e. the aspherical coefficients, when a2>Hyperboloid when 0, when a2When being 0, the compound is paraboloid, when being-1<a2<0 is a long ellipsoid, a2When the expression is-1, it is spherical, a2<-1 is an oblate ellipsoid. The rear optical surface of the fourth lens adopts an aspheric structure, and the front optical surface of the fourth lens adopts an aspheric structureThe optical surface adopts a spherical structure, the front optical surface of the fifth lens adopts an aspheric structure, the rear optical surface adopts a spherical structure, and the front and rear optical surfaces of the rest of lenses all adopt spherical structures.
According to the aberration theory of the Lu plane symmetric optical system, the wave aberration distribution of each optical surface of the fish-eye lens system is calculated, and one or more optical surfaces which are sensitive to aspheric coefficient change, namely the optical surfaces of which aspheric coefficients have large influence on the total aberration of the system, are found by combining an evaluation function capable of quantifying the imaging performance of the optical system, so that two optical surfaces of which aspheric coefficients have large influence on the system aberration in the fish-eye lens are selected as aspheric surfaces.
Further preferably, an aspherical surface type coefficient of a rear optical surface of the first biconcave lens as a fourth lens is a2The aspheric surface type coefficient of the front optical surface of the lens with the convex surface facing the object side as the fifth lens is a2-1.092, wherein the surface type coefficients of the remaining optical surfaces in the optical system are all a2Is-1. The aspheric coefficients in the invention are all close to spherical surfaces, are easy to process, detect, install and debug, and play a key contribution to improving the imaging performance of the optical system.
Preferably, the full field angle of the fisheye lens optical system is 220 degrees, the total focal length is 3.878mm, the D/f' value is 1/2.8, and the rear working distance, namely the distance from the last optical surface of the optical system to the image surface, is 22.645 mm. The axial length of the optical system, the distance from the first reflecting surface of the catadioptric optical system to the image plane, is 175.825 mm.
Preferably, the air space between the front light group and the rear light group is 8.67mm, the air space between the front light group and the aperture stop STO is 6.488mm, and the air space between the aperture stop STO and the rear light group is 2.182 mm.
Preferably, the air space between the three lenses with the convex surfaces facing the object is 36.714mm and 12.269mm, the air space between the lens with the convex surfaces facing the object and the first biconcave lens is 14.253mm, the air space between the first biconcave lens and the lens with the convex surfaces facing the object is 0.469mm, the air space between the lens with the convex surfaces facing the object and the first biconvex lens is 25.311mm, the air space between the first biconvex lens and the double cemented lens formed by the second biconvex lens and the first lens with the convex surfaces facing the image is 0.074mm, and the air space between the double cemented lens formed by the third biconvex lens and the second lens with the convex surfaces facing the image and the double cemented lens formed by the second biconcave lens and the fourth biconvex lens is 0.08 mm.
Preferably, the material of the three lenses with convex surfaces facing the object side and the material of the fourth biconvex lens are N-BK7, the material of the first biconcave lens is SK51, the material of the lens with convex surfaces facing the object side is SF10, the material of the first biconvex lens is SF12, the material of the second biconvex lens is D263TECO, the material of the first lens with convex surfaces facing the image side is LAFN28, the material of the third biconvex lens is K3, the material of the second lens with convex surfaces facing the image side is P-LASF47, and the material of the second biconcave lens is SF 1.
Further preferably, the first lens, the second lens, the third lens and the twelfth lens of the lens group are all made of N-BK7, the refractive index is 1.5168, and the Abel number is 64.167; the fourth lens material is SK51, the refractive index is 1.6209, and the Abel number is 60.311; the fifth lens material is SF10, the refractive index is 1.7283, and the Abbe number is 28.41; the sixth lens material is SF12, the refractive index is 1.6483, and the Abbe number is 33.841; the seventh lens material is D263TECO, the refractive index is 1.5233, and the Abel number is 54.517; the eighth lens material is LAFN28, refractive index 1.7731, abelian number 49.568; the ninth lens material is K3, the refractive index is 1.5182, and the Abel number is 58.977; the tenth lens material is P-LASF47, the refractive index is 1.8061, and the Abbe number is 40.9; the eleventh lens material was SF1, had a refractive index of 1.7174 and an abelian number of 29.513.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the optical system has the advantages of large aperture, wide rear working distance, long axial length and strong adjustability, and the aperture F/# of the optical system reaches 2.8, thereby having more practical value;
2. the fisheye lens optical system designed by the invention adopts two aspheric surfaces, the imaging performance of the oversized view field is effectively improved and is more than 180 degrees, and the aspheric surface coefficient of the fisheye lens optical system is close to the spherical surface, so that the fisheye lens optical system is easy to process and manufacture, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an optical system including two aspheric fisheye lenses according to a preferred embodiment of the invention.
Fig. 2 is a schematic diagram of optical parameter labeling of an optical system including two aspheric fisheye lenses according to a preferred embodiment of the invention.
Fig. 3 is a MTF graph of an optical system including two aspherical fisheye lenses according to a preferred embodiment of the invention.
Fig. 4 is a dot-sequence diagram of an optical system including two aspherical fisheye lenses in accordance with a preferred embodiment of the present invention.
Fig. 5 is a field curvature and distortion curve of an optical system including two aspherical fisheye lenses according to a preferred embodiment of the present invention.
Fig. 6 is an optical path diagram of an optical system including two aspherical fisheye lenses according to a preferred embodiment of the present invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this embodiment, a fisheye lens comprising two aspheric lenses comprises 12 lenses, and a front light group, an aperture stop, and a rear light group are sequentially disposed along an optical axis from an object side to an image side, where the front light group is composed of three first lenses (1, 2, 3) with convex surfaces facing the object side, a first biconcave lens 4, a lens 5 with convex surfaces facing the object side, a first biconvex lens 6, a second biconvex lens 7, and a first lens 8 with convex surfaces facing the image side; the second biconvex lens 7 and the first lens 8 with the convex surface facing the image side form a biconvex lens;
the aperture diaphragm is a thin metal wafer with a hole at the center, and the size of the light-transmitting aperture is limited;
the rear light group comprises a double-cemented lens consisting of a third biconvex lens 9 and a second lens 10 with the convex surface facing the image space, and a double-cemented lens consisting of a second biconcave lens 11 and a fourth biconvex lens 12;
the optical surfaces of the rear light group lenses are spherical surfaces; the rear optical surface and the convex surface of the first biconcave lens 4 of the front optical group face the front optical surface of the lens 5 of the object space by adopting a secondary rotating conical surface, the front optical surface and the convex surface of the first biconcave lens 4 of the front optical group face the rear optical surface of the lens 5 of the object space by adopting a spherical surface, and the optical surfaces of the other lenses of the front optical group are spherical surfaces.
The embodiment comprises two aspheric fisheye lens optical systems, can complete the imaging of objects with ultra-large view fields, and has the advantages of good adjustability, high imaging quality, low cost and convenient processing.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in the present embodiment, the air space between the front light group and the back light group of the optical system of the fisheye lens including two aspheric surfaces is 8.67mm, the air space between the front light group and the aperture stop STO is 6.488mm, and the air space between the aperture stop STO and the back light group is 2.182 mm.
In this embodiment, the air space between the three lenses (1, 2, and 3) whose convex surfaces face the object is 36.714mm and 12.269mm, the air space between the lens 3 whose convex surfaces face the object and the first biconcave lens 4 is 14.253mm, the air space between the first biconcave lens 4 and the lens 5 whose convex surfaces face the object is 0.469mm, the air space between the lens 5 whose convex surfaces face the object and the first biconvex lens 6 is 25.311mm, the air space between the first biconvex lens 6 and the biconvex lens composed of the second biconvex lens 7 and the first biconvex lens 8 whose convex surfaces face the image is 0.074mm, and the air space between the biconvex lens composed of the third biconvex lens 9 and the second biconvex lens 10 whose convex surfaces face the image and the biconcave lens composed of the second biconvex lens 11 and the fourth biconvex lens 12 is 0.08 mm.
In this embodiment, when the back optical surface of the first biconcave lens 4 and the front optical surface of the lens 5 with the convex surface facing the object side both adopt conic surfaces, the aspheric surface coefficients of the back optical surface of the first biconcave lens 4 and the front optical surface of the lens 5 with the convex surface facing the object side should satisfy the following equation:
x′2+y′2＝a1z′+a2z′2
in the equation, a1＝2R0，R0Denotes a radius of curvature at the apex of an aspherical surface-type curve of the optical surface of the lens, a2Is to determine the coefficients of the conic surface type, i.e. the aspherical coefficients, when a2>Hyperboloid when 0, when a2When being 0, the compound is paraboloid, when being-1<a2<0 is an elongated ellipsoid, a2When the expression is-1, it is spherical, a2<-1 is an oblate ellipsoid.
In this embodiment, the material of the three lenses (1, 2, 3) whose convex surfaces face the object side and the fourth biconvex lens 12 is N-BK7, the material of the first biconcave lens 4 is SK51, the material of the lens 5 whose convex surfaces face the object side is SF10, the material of the first biconvex lens 6 is SF12, the material of the second biconvex lens 7 is D263TECO, the material of the first lens 8 whose convex surfaces face the image side is LAFN28, the material of the third biconvex lens 9 is K3, the material of the second lens 10 whose convex surfaces face the image side is P-LASF47, and the material of the second biconvex lens 11 is SF 1.
In this example, the full field angle of the fisheye lens optical system is 220 °, the total focal length is 3.878mm, and the F-number is 2.8. The rear working distance, the distance from the last optical surface of the optical system to the image surface, is 22.645mm, and the axial length of the optical system, the distance from the first reflecting surface of the catadioptric optical system to the image surface, is 175.825 mm.
The working field angle of the optical system comprising the two aspheric fisheye lenses is in a range of 0-110 degrees, and the imaging of objects with ultra-large field angles can be completed; the optical system of the embodiment has the advantages of large aperture, wide rear working distance, long axial length and strong adjustability; in the working view field range, the optical system of the embodiment has good image surface uniformity and high imaging quality, and meanwhile, the optical system has the advantages of simple structure, low cost, convenience in processing and higher practical value.
Example three:
this embodiment is substantially the same as the above embodiment, and is characterized in that:
in this embodiment, a fisheye lens including two aspheric lenses includes 12 lenses, and is provided with a front light group, an aperture stop, and a rear light group in sequence from an object side to an image side along an optical axis, and is characterized in that: the front light group consists of three front lenses (1, 2 and 3) with convex surfaces facing an object space, a first biconcave lens 4, a lens 5 with convex surfaces facing the object space, a first biconvex lens 6, a second biconvex lens 7 and a first lens 8 with convex surfaces facing an image space; the second biconvex lens 7 and the first lens 8 with the convex surface facing the image side form a biconvex lens;
the aperture diaphragm is a thin metal wafer with a hole at the center, and the size of the light-transmitting aperture is limited;
the rear light group comprises a double-cemented lens consisting of a third biconvex lens 9 and a second lens 10 with the convex surface facing the image space, and a double-cemented lens consisting of a second biconcave lens 11 and a fourth biconvex lens 12; the rear optical surface of the first biconcave lens 4 and the front optical surface of the lens 5 with the convex surface facing the object space are conic surfaces, and the front optical surface of the first biconcave lens 4 and the rear optical surface of the lens 5 with the convex surface facing the object space are spherical surfaces; and the optical surfaces of the other lenses of the rear light group are spherical surfaces.
In the present embodiment, the back optical surface type coefficient a of the first biconcave lens 42A front optical surface profile factor a of the lens 5 with convex surfaces facing the object side of-1.6462Is-1.092, i.e. the surface type of the two aspheric surfaces is an oblate ellipsoid, the surface type coefficients a of the rest lenses of the front group and each lens of the rear group optical system2Are all-1.
In the present embodiment, the operating field angle of the fisheye lens optical system is in the range of 0 ° to 110 °, the total focal length is 22.68mm, F/# ═ 2.8, and the system axial length is 175.825 mm.
In this embodiment, an aperture stop STO is disposed between the front group optical system and the rear group optical system, that is, the aperture stop STO is disposed between the first lens 8 and the third lenticular lens 9, both of which have convex surfaces facing the image side, and the aperture stop STO has a diameter size of 4.679 mm.
In the embodiment, the lenses (1, 2 and 3) with convex surfaces facing the object space and the fourth biconvex lens 12 are made of N-BK7, the refractive index is 1.5168, and the Abel number is 64.167; the material of the first biconcave lens 4 is SK51, the refractive index is 1.6209, and the Abel number is 60.311; the lens 5 with convex surfaces facing the object space is made of SF10, the refractive index is 1.7283, and the Abel number is 28.41; the first biconvex lens 6 is made of SF12, has a refractive index of 1.6483 and an Abbe number of 33.841; the material of the second biconvex lens 7 is D263TECO, the refractive index is 1.5233, and the Abel number is 54.517; the material of the first lens 8 with the convex surfaces facing the image side is LAFN28, the refractive index is 1.7731, and the Abbe number is 49.568; the third biconvex lens 9 is made of K3, has a refractive index of 1.5182 and an abelian number of 58.977; the material of the lens 10 with the convex surfaces facing the image side of the second block is P-LASF47, the refractive index is 1.8061, and the Abel number is 40.9; the lens 11 with the second convex surfaces facing the object side is made of SF1, the refractive index is 1.7174, and the Abel number is 29.513.
Fig. 1 is a schematic structural diagram of an optical system of a fisheye lens including two aspheric surfaces in this embodiment, from an object plane to an image plane, a principal ray sequentially passes through an incident surface 1 'and an exit surface 2' of a first block lens 1 whose convex surfaces face an object, an incident surface 3 'and an exit surface 4' of a second block lens 2 whose convex surfaces face the object, an incident surface 5 'and an exit surface 6' of a third block lens 3 whose convex surfaces face the object, an incident surface 7 'and an exit surface 8' of a first biconcave lens 4, an incident surface 9 'and an exit surface 10' of a lens 5 whose convex surfaces face the object, an incident surface 11 'and an exit surface 12' of the first biconvex lens 6, an incident surface 13 ', a cemented surface 14' and an exit surface 15 'of a biconvex lens formed by a second biconvex lens 7 and a first lens 8 whose convex surfaces face the image, and an incident surface 16' of a biconvex lens formed by a second lens 9 and a second lens 10 whose convex surfaces face the image, A cemented surface 17 ' and an exit surface 18 ', an incident surface 19 ', a cemented surface 20 ', and an exit surface 21 ' of a double cemented lens composed of the second biconcave lens 11 and the fourth biconvex lens 12.
Fig. 2 is a schematic diagram illustrating optical parameter labeling of an optical system of a fisheye lens including two aspheric surfaces in this embodiment. r is1、r2Radius of curvature, r, of the entrance face 1 'and exit face 2' of the first lens 13、r4Radius of curvature, r, of the entrance face 3 'and exit face 4' of the second lens 25、r6Radius of curvature, r, of the incident surface 5 'and the exit surface 6' of the third lens 37Is the radius of curvature, r, of the incident surface 7' of the first biconcave lens 48Is the radius of curvature, r, at the apex of the exit face 8' of the first biconcave lens 49Radius of curvature at the apex of the entry face 9' of the lens 5, r, convex all facing the object10Radius of curvature, r, of the exit face 10' of the lens 5, convex towards the object11、r12Radius of curvature, r, of the entrance face 11 'and the exit face 12' of the first biconvex lens 613、r14、r15The curvature radius r of the incident surface 13 ', the adhesive surface 14 ' and the exit surface 15 ' of the double cemented lens composed of the second biconvex lens 7 and the first lens 8 with the convex surface facing the image16、r17、r18The radius of curvature r of the incident surface 16 ', the bonding surface 17 ' and the exit surface 18 ' of the double-cemented lens formed by the third double-convex lens 9 and the second lens 10 with the convex surface facing the image space19、r20、r21The radius of curvature of the incident surface 19 ', the cemented surface 20 ' and the exit surface 21 ' of the double cemented lens composed of the second double concave lens 11 and the fourth double convex lens 12; d1、d3、d5、d7、d9、d11、d13、d14、d17、d18、d20、d21The lens thicknesses d of the first lens 1 to the second lens 10, respectively, with their convex surfaces facing the image side2Is the air space between the first lens 1 and the second lens 2, d4Is the air space between the second lens 2 and the third lens 3, d6Is the air space between the third lens 3 and the first biconcave lens 4, d8Is a first biconcave lens4 and a lens 5 with convex surfaces facing the object, d10The air space between the lens 5, the convex surfaces of which are both directed towards the object, and the first biconvex lens 6, d12The air space between the first biconvex lens 6 and the second biconvex lens 7 and the first cemented doublet lens 8 with its convex surface facing the image side, d15The air space between the aperture diaphragm and the double cemented lens consisting of the second biconvex lens 7 and the first lens 8 with the convex surface facing the image space, d16The air space between the aperture diaphragm and the double cemented lens composed of the third biconvex lens 9 and the second lens 10 with its convex surface facing the image space, d19The air space between the double-cemented lens composed of the third biconvex lens 9 and the second lens 10 with the convex surface facing the image space and the double-cemented lens composed of the second biconcave lens 11 and the fourth biconvex lens 12, d22Is the air space between the double cemented lens composed of the second double concave lens 11 and the fourth double convex lens 12 and the image plane.
Fig. 3 is an MTF curve of the FFT method of the fisheye lens optical system including two aspheric surfaces in the present embodiment, in which the horizontal axis represents the operating field angle and the unit is degrees (°); the vertical axis represents the MTF values, ranging from 0 to 1; and evaluating the imaging quality of the optical system according to the MTF value of the optical system. Wherein, the higher and gentler the curve value is, the better the imaging quality of the optical system is represented. Solid lines with solid figures (circles and triangles) and solid lines with open figures (circles and triangles) are shown as chief rays with spatial frequencies of 30lp/mm and 10lp/mm, respectively; in the figure, the solid line with circles (including solid and hollow graphs) and the solid line with triangles (including solid and hollow graphs) are respectively expressed as the meridional direction and the arc loss direction, and it can be seen from the figure that the MTF curve of the fisheye lens optical system is kept very stable in the range of the working field angle of 0 ° to 110 °, which shows that the imaging quality of the optical system is very good in the working range of the field angle.
Fig. 4 is a ray tracing point diagram of the optical system of the fisheye lens including two aspheric surfaces in the present embodiment, which shows ray tracing point diagrams at operating angles of view of 0 °, 30 °, 60 °, 90 ° and 110 °, respectively. The figure contains dot charts of light of three different wavelengths as operating light, namely C light (red light, 656.27nm wavelength), D light (yellow light, 587.56nm wavelength) and F light (blue light, 486.13nm wavelength). It can be seen from fig. 4 that the spot radius of the optical system is small under different angles of view and working rays, which indicates that the corresponding geometric aberrations of the optical system are small in the working angle of view.
Fig. 5 shows the field curvature and F-Theta distortion curve of the optical system of the fisheye lens with two aspheric surfaces in this embodiment, where the field curvature and distortion are one of the important indicators for measuring the lens quality of the optical system. The horizontal axis of the field curvature curve represents field curvature magnitude in mm, and the vertical axis represents field angle in degrees (°); the horizontal axis of the F-Theta distortion curve represents the deviation of distortion between the design lens and the use model in percentage (%) and the vertical axis represents the half field angle in degrees (°). Zemax software can only display the situation with a maximum angle of view of 89 °. Fig. 5 shows that the fish-eye lens optical system including two aspheric surfaces designed by the present invention has small field curvature in the working field angle range, and also shows that the axial chromatic aberration is small, and the distortion meets the lens imaging requirements. The working angle of view of the fish-eye lens optical system comprising the two aspheric surfaces is wide, and the imaging of objects with ultra-large field of view can be completed.
The optical parameters of the optical system of the fish-eye lens including two aspherical surfaces in this embodiment are shown in table 1.
Table 1 example optical parameters of a fish-eye lens optical system comprising two aspherical surfaces
| Optical surface | Radius of curvature | Optical spacer | Coefficient of surface shape | Refractive index | Material |
| Article surface | ∞ | ∞ | - | - | - |
| 1 | 101.849 | 5.710 | -1 | 1.51680 | N- |
| 2 | 42.464 | 36.714 | -1 | ||
| 3 | 62.090 | 3.317 | -1 | 1.51680 | N- |
| 4 | 26.524 | 16.269 | -1 | ||
| 5 | 183.382 | 2.984 | -1 | 1.51680 | N-BK7 |
| 6 | 14.557 | 14.253 | -1 | ||
| 7 | -44.463 | 7.647 | -1 | 1.62090 | SK51 |
| 8 | 22.639 | 0.469 | -1.646 | ||
| 9 | 22.000 | 10.487 | -1.092 | 1.72825 | |
| 10 | 82.475 | 25.311 | -1 | ||
| 11 | 179.113 | 2.189 | -1 | 1.64831 | SF12 |
| 12 | -152.798 | 0.074 | -1 | ||
| 13 | 42.159 | 4.467 | -1 | 1.52330 | D263TECO |
| 14 | -25.056 | 2.421 | -1 | 1.77314 | LAFN28 |
| 15 | -63.236 | 6.488 | -1 | ||
| STO | ∞ | 2.182 | - | ||
| 16 | 31.733 | 7.478 | -1 | 1.51820 | K3 |
| 17 | -8.615 | 0.602 | -1 | 1.80610 | P-LASF47 |
| 18 | -28.284 | 0.080 | -1 | ||
| 19 | -147.334 | 0.720 | -1 | 1.71736 | |
| 20 | 28.339 | 3.283 | -1 | 1.51680 | N-BK7 |
| 21 | -14.176 | 22.680 | - | - | - |
| Image plane | ∞ | ∞ | - | - | - |
In summary, the present invention discloses a panoramic imaging optical system including an aspheric catadioptric system. This system is equipped with preceding optical group, aperture diaphragm, back optical group along the optical axis by object space to image space in proper order, preceding optical group all towards the negative lens and a biconcave lens of object space and a convex surface all towards the lens of object space by three convex surface and constitute, back optical group mainly include that a biconvex lens, biconvex lens and convex surface all towards the double-cemented lens that the lens of image space is constituteed, the biconvex lens and convex surface all towards the double-cemented lens that the lens of image space is constituteed and the biconvex lens that the convex surface all towards the lens of object space and biconvex lens are constituteed, the back optical surface of lens and the preceding optical surface of lens are the aspheric surface, and all the other optical surfaces are the sphere. The aperture diaphragm is a thin metal wafer with a hole at the center, and aims to limit the size of the clear aperture. The embodiment adopts 12 single lenses, can realize the maximum working visual angle of 220 degrees, the receiving aperture can reach F/2.8, and the focal length is 22.68 mm; and the system has the characteristics of good image surface illumination uniformity, excellent imaging performance, simple and compact structure and easy processing.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, as long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the present invention.
Claims (7)
1. The utility model provides a fish-eye lens who contains two aspherical lens, includes 12 lenses, follows the object space along the optical axis and to like the image space, is equipped with preceding light group, aperture diaphragm, back light group its characterized in that in proper order: the front light group consists of three front lenses (1, 2 and 3) with convex surfaces facing an object space, a first biconcave lens (4), a lens (5) with convex surfaces facing the object space, a first biconvex lens (6), a second biconvex lens (7) and a first cemented lens (8) with convex surfaces facing an image space; the second biconvex lens (7) and the first lens (8) with the convex surface facing the image side form a biconjugated lens;
the aperture diaphragm is a thin metal wafer with a hole at the center, and the size of the light-transmitting aperture is limited;
the rear light group comprises a double-cemented lens consisting of a third biconvex lens (9) and a second lens (10) with convex surfaces facing the image space, and a double-cemented lens consisting of a second biconcave lens (11) and a fourth biconvex lens (12);
the optical surfaces of all the lenses of the rear light group are spherical surfaces; the front optical surface of the lens (5) with the rear optical surface and the convex surface of the first biconcave lens (4) facing the object space in the front light group is a conic surface, the rear optical surface of the lens (5) with the front optical surface and the convex surface of the first biconcave lens (4) facing the object space is a spherical surface, and the optical surfaces of the other lenses of the front light group are spherical surfaces.
2. The fish-eye lens including two aspherical lenses according to claim 1, wherein: when the rear optical surface of the first biconcave lens (4) and the front optical surface of the lens (5) with the convex surface facing the object side adopt the conic surface of second revolution, the aspheric surface type coefficient of the front optical surface of the lens (5) with the rear optical surface of the first biconcave lens (4) and the convex surface facing the object side should satisfy the following equation:
x'2+y'2＝a1z'+a2z'2
in the equation, a1＝2R0，R0Denotes a radius of curvature at the apex of an aspherical surface-type curve of the optical surface of the lens, a2Is to determine the coefficients of the conic surface type, i.e. the aspherical coefficients, when a2>Hyperboloid when 0, when a2When being 0, the compound is paraboloid, when being-1<a2<0 is an elongated ellipsoid, a2When the expression is-1, it is spherical, a2<-1 is an oblate ellipsoid.
3. The fish-eye lens including two aspherical lenses according to claim 2, wherein: the aspheric surface type coefficient of the rear optical surface (8') of the first biconcave lens (4) isa2-1.646, the aspheric surface type coefficient of the front optical surface (9') of the lens (5) with the convex surfaces facing the object side is a21.092, and the surface type coefficients of the rest optical surfaces in the optical system are all a2＝-1。
4. The fish-eye lens including two aspherical lenses according to claim 1, wherein: the full field angle of the fisheye lens optical system is 220 degrees, the total focal length is 3.878mm, the D/f' value is 1/2.8, and the rear working distance is 22.645 mm.
5. The fish-eye lens comprising two aspherical lenses according to claim 1, wherein: the air space between the front light group and the rear light group is 8.67mm, the air space between the front light group and the aperture stop STO is 6.488mm, and the air space between the aperture stop STO and the rear light group is 2.182 mm.
6. The fish-eye lens comprising two aspherical lenses according to claim 1, wherein: the air space between the three lenses (1, 2 and 3) with the convex surfaces facing the object is 36.714mm and 12.269mm, the air space between the lens (3) with the convex surfaces facing the object and the first biconcave lens (4) is 14.253mm, the air space between the first biconcave lens (4) and the lens (5) with the convex surfaces facing the object is 0.469mm, the air space between the lens (5) with the convex surfaces facing the object and the first biconvex lens (6) is 25.311mm, the air space between the first biconvex lens (6) and the biconvex lens formed by the second biconvex lens (7) and the lens (8) with the convex surfaces facing the image is 0.074mm, the air space between the double cemented lens consisting of the third biconvex lens (9) and the second lens (10) whose convex surfaces face the image side and the double cemented lens consisting of the second biconcave lens (11) and the fourth biconvex lens (12) was 0.08 mm.
7. The fisheye lens comprising two aspheric lenses as claimed in any one of claims 1 to 6, characterized in that: the three lenses (1, 2 and 3) with convex surfaces facing the object side and the fourth biconvex lens (12) are made of N-BK7, the first biconcave lens (4) is made of SK51, the lens (5) with convex surfaces facing the object side is made of SF10, the first biconvex lens (6) is made of SF12, the second biconvex lens (7) is made of D263TECO, the lens (8) with convex surfaces facing the image side is made of LAFN28, the third biconvex lens (9) is made of K3, the lens (10) with convex surfaces facing the image side is made of P-LASF47, and the lens (11) with convex surfaces facing the image side is made of SF 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026993.4A CN114460716B (en) | 2022-01-11 | 2022-01-11 | Fisheye lens comprising two aspherical lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210026993.4A CN114460716B (en) | 2022-01-11 | 2022-01-11 | Fisheye lens comprising two aspherical lenses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114460716A true CN114460716A (en) | 2022-05-10 |
| CN114460716B CN114460716B (en) | 2023-10-20 |
Family
ID=81409128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210026993.4A Active CN114460716B (en) | 2022-01-11 | 2022-01-11 | Fisheye lens comprising two aspherical lenses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114460716B (en) |
Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043350A (en) * | 2001-07-30 | 2003-02-13 | Pentax Corp | Wide-angle lens system |
| JP2004085600A (en) * | 2002-08-22 | 2004-03-18 | Pentax Corp | Wide angle zoom lens system |
| JP2009058817A (en) * | 2007-08-31 | 2009-03-19 | Sigma Corp | Fisheye lens |
| US20120013996A1 (en) * | 2010-07-14 | 2012-01-19 | Canon Kabushiki Kaisha | Optical system having fisheye zoom lens and optical apparatus having the optical system |
| JP2012173730A (en) * | 2011-02-24 | 2012-09-10 | Nikon Corp | Zoom lens, optical device, and manufacturing method for zoom lens |
| CN103439783A (en) * | 2011-11-15 | 2013-12-11 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| CN104101989A (en) * | 2014-08-04 | 2014-10-15 | 江苏卡罗卡国际动漫城有限公司 | Fish-eye lens for doublet lens |
| CN105445910A (en) * | 2015-09-17 | 2016-03-30 | 上海大学 | Super-large-field-of-view fish-eye lens having aspheric-structure-based lens |
| US20160170175A1 (en) * | 2014-12-10 | 2016-06-16 | Young Optics Inc. | Optical lens |
| CN106094171A (en) * | 2016-08-08 | 2016-11-09 | 上海大学 | A kind of ultra-large vision field and the fish eye lens of object lens of large relative aperture |
| CN106226889A (en) * | 2016-08-25 | 2016-12-14 | 厦门爱劳德光电有限公司 | A kind of 12,000,000 pixel fish eye lenses |
| CN106932888A (en) * | 2016-12-24 | 2017-07-07 | 舜宇光学(中山)有限公司 | A kind of 360 ° of panorama fish eye lenses |
| CN106932887A (en) * | 2016-11-10 | 2017-07-07 | 嘉兴中润光学科技有限公司 | A kind of vehicle-mounted wide-angle lens |
| CN108732720A (en) * | 2018-04-16 | 2018-11-02 | 上海大学 | A kind of object lens of large relative aperture fish eye lens can be applied to photography |
| CN108845404A (en) * | 2018-07-17 | 2018-11-20 | 莆田学院 | A kind of miniature non-spherical fish eye lens can be used for vehicle-mounted monitoring |
| CN108873258A (en) * | 2018-07-17 | 2018-11-23 | 莆田学院 | A kind of ultra-wide angle, large aperture FISH EYE LENS OPTICS system |
| CN109884775A (en) * | 2019-04-23 | 2019-06-14 | 莆田学院 | It can be used for the bugeye lens system of capsule endoscope |
| JP2020056865A (en) * | 2018-10-01 | 2020-04-09 | キヤノン株式会社 | Optical system and image capturing device having the same |
| CN112649949A (en) * | 2020-12-25 | 2021-04-13 | 上海大学 | Simple fisheye lens comprising an aspherical lens |
| CN113311573A (en) * | 2021-03-18 | 2021-08-27 | 上海大学 | Comprises an aspheric catadioptric panoramic imaging optical system |
| CN113835202A (en) * | 2021-07-24 | 2021-12-24 | 上海大学 | Large-view-field hemispherical airspace fisheye lens system |
-
2022
- 2022-01-11 CN CN202210026993.4A patent/CN114460716B/en active Active
Patent Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043350A (en) * | 2001-07-30 | 2003-02-13 | Pentax Corp | Wide-angle lens system |
| JP2004085600A (en) * | 2002-08-22 | 2004-03-18 | Pentax Corp | Wide angle zoom lens system |
| JP2009058817A (en) * | 2007-08-31 | 2009-03-19 | Sigma Corp | Fisheye lens |
| US20120013996A1 (en) * | 2010-07-14 | 2012-01-19 | Canon Kabushiki Kaisha | Optical system having fisheye zoom lens and optical apparatus having the optical system |
| JP2012173730A (en) * | 2011-02-24 | 2012-09-10 | Nikon Corp | Zoom lens, optical device, and manufacturing method for zoom lens |
| CN103439783A (en) * | 2011-11-15 | 2013-12-11 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| CN104101989A (en) * | 2014-08-04 | 2014-10-15 | 江苏卡罗卡国际动漫城有限公司 | Fish-eye lens for doublet lens |
| US20160170175A1 (en) * | 2014-12-10 | 2016-06-16 | Young Optics Inc. | Optical lens |
| CN105445910A (en) * | 2015-09-17 | 2016-03-30 | 上海大学 | Super-large-field-of-view fish-eye lens having aspheric-structure-based lens |
| CN106094171A (en) * | 2016-08-08 | 2016-11-09 | 上海大学 | A kind of ultra-large vision field and the fish eye lens of object lens of large relative aperture |
| CN106226889A (en) * | 2016-08-25 | 2016-12-14 | 厦门爱劳德光电有限公司 | A kind of 12,000,000 pixel fish eye lenses |
| CN106932887A (en) * | 2016-11-10 | 2017-07-07 | 嘉兴中润光学科技有限公司 | A kind of vehicle-mounted wide-angle lens |
| CN106932888A (en) * | 2016-12-24 | 2017-07-07 | 舜宇光学(中山)有限公司 | A kind of 360 ° of panorama fish eye lenses |
| CN108732720A (en) * | 2018-04-16 | 2018-11-02 | 上海大学 | A kind of object lens of large relative aperture fish eye lens can be applied to photography |
| CN108845404A (en) * | 2018-07-17 | 2018-11-20 | 莆田学院 | A kind of miniature non-spherical fish eye lens can be used for vehicle-mounted monitoring |
| CN108873258A (en) * | 2018-07-17 | 2018-11-23 | 莆田学院 | A kind of ultra-wide angle, large aperture FISH EYE LENS OPTICS system |
| JP2020056865A (en) * | 2018-10-01 | 2020-04-09 | キヤノン株式会社 | Optical system and image capturing device having the same |
| CN109884775A (en) * | 2019-04-23 | 2019-06-14 | 莆田学院 | It can be used for the bugeye lens system of capsule endoscope |
| CN112649949A (en) * | 2020-12-25 | 2021-04-13 | 上海大学 | Simple fisheye lens comprising an aspherical lens |
| CN113311573A (en) * | 2021-03-18 | 2021-08-27 | 上海大学 | Comprises an aspheric catadioptric panoramic imaging optical system |
| CN113835202A (en) * | 2021-07-24 | 2021-12-24 | 上海大学 | Large-view-field hemispherical airspace fisheye lens system |
Non-Patent Citations (6)
| Title |
|---|
| 吕丽军;吴学伟;: "鱼眼镜头初始结构的设计" * |
| 吕丽军;吴学伟;: "鱼眼镜头初始结构的设计", 光学学报, no. 02 * |
| 张宝龙;李丹;张少敬;李洪蕊;杨继超;王靖云;: "非球面鱼眼镜头设计及畸变校正算法研究" * |
| 张宝龙;李丹;张少敬;李洪蕊;杨继超;王靖云;: "非球面鱼眼镜头设计及畸变校正算法研究", 光学学报, no. 12 * |
| 牛智全;吕丽军;: "鱼眼镜头光学***的优化方法" * |
| 牛智全;吕丽军;: "鱼眼镜头光学***的优化方法", 光学仪器, no. 05 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114460716B (en) | 2023-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102455488B (en) | Ultra wide-angle lens | |
| CN110824669B (en) | 8K high-resolution panoramic annular optical lens | |
| CN108490581A (en) | A kind of small distortion imaging system of large aperture ultra-wide angle | |
| US20090310230A1 (en) | Transmitting optical element and optical system using the same | |
| CN210427928U (en) | Big light ring tight shot and shooting device | |
| CN209842204U (en) | Small-field-of-view ultraviolet objective optical system, ultraviolet objective and ultraviolet detector | |
| JPH06300965A (en) | Wide-angle lens | |
| CN113311573B (en) | Comprises an aspheric catadioptric panoramic imaging optical system | |
| CN112285884B (en) | 1.14mm ultra-wide angle optical system and imaging method thereof | |
| JP2578481B2 (en) | Projection lens | |
| CN104330867A (en) | Large-aperture small-F-number optical system used for television wave band | |
| CN211206932U (en) | 1.4mm wide-angle optical system | |
| JP2010060692A (en) | Imaging optical system and imaging apparatus | |
| JP7239985B2 (en) | Imaging optical system | |
| CN115248496B (en) | High-definition optical lens and high-performance laser radar | |
| CN114460716A (en) | Fisheye lens comprising two aspherical lenses | |
| CN110703414A (en) | Big light ring tight shot and shooting device | |
| CN109709665A (en) | A kind of doubly telecentric camera lens and optical system | |
| CN216285930U (en) | Fixed focus lens | |
| CN112649949B (en) | Simple fisheye lens comprising an aspherical lens | |
| US11226471B2 (en) | Camera lens assembly | |
| JP2639963B2 (en) | Endoscope objective lens | |
| CN112394486A (en) | Large-target-surface five-million-pixel optical lens and imaging method thereof | |
| JP2858639B2 (en) | Wide-angle lens for UV | |
| JP2008134535A (en) | Fisheye lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |