CN113419332A - Positive distortion fisheye lens - Google Patents

Positive distortion fisheye lens Download PDF

Info

Publication number
CN113419332A
CN113419332A CN202110877205.8A CN202110877205A CN113419332A CN 113419332 A CN113419332 A CN 113419332A CN 202110877205 A CN202110877205 A CN 202110877205A CN 113419332 A CN113419332 A CN 113419332A
Authority
CN
China
Prior art keywords
lens
refractive index
image
lens element
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.)
Pending
Application number
CN202110877205.8A
Other languages
Chinese (zh)
Inventor
张军光
潘锐乔
黄波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Leading Optics Co Ltd
Original Assignee
Xiamen Leading Optics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xiamen Leading Optics Co Ltd filed Critical Xiamen Leading Optics Co Ltd
Priority to CN202110877205.8A priority Critical patent/CN113419332A/en
Publication of CN113419332A publication Critical patent/CN113419332A/en
Pending legal-status Critical Current

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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical 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
    • G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
    • 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
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • 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)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)

Abstract

The invention discloses a positive distortion fisheye lens, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface and an image side surface; the first lens has negative refractive index; the second lens has negative refractive index; the third lens element has negative refractive index; the fourth lens element has negative refractive index; the fifth lens element has positive refractive index; the sixth lens element has positive refractive index; the seventh lens element has positive refractive index; the eighth lens element has a negative refractive index; the ninth lens element has positive refractive index; the tenth lens element has a negative refractive index; the optical imaging lens has only ten lenses with refractive indexes. The invention can support 12MP pixels, has high-definition imaging effect and clear and uniform imaging pictures; the lens can be ensured to have good picture brightness when used in a night environment; the confocal optical fiber can be used for day and night confocal, the day and night dual-purpose is realized, and the imaging can be ensured to be clear in a night mode; the pixel ratio at the edge of the lens is large, and the compression feeling is small.

Description

Positive distortion fisheye lens
Technical Field
The invention relates to the technical field of lenses, in particular to a positive distortion fisheye lens.
Background
The front lens of the fisheye lens is large in diameter and protrudes towards the front of the lens in a parabolic shape, and is quite similar to the fish eye, so the fisheye lens is commonly called as the fisheye lens, and the fisheye lens is widely applied to the fields of VR cameras, security monitoring, video conferences, unmanned aerial vehicles, vehicles and the like at present, so the requirements on the fisheye lens are higher and higher. However, the existing fisheye lens has at least the following disadvantages:
1. common fish-eye lenses have low pixels, insufficient resolution, blurred imaging pictures and more noise.
2. Due to the wide-angle design requirement, the light passing of a general fisheye lens is generally not large, and the relative illumination of the edge of a picture is low.
3. The common fisheye lens can only support single-visible use or single-infrared use, and cannot reach a clear state at the same time day and night.
4. The common fisheye lens has negative f-theta distortion, large distortion, less pixel proportion at the edge and strong compression sense.
Disclosure of Invention
An object of the present invention is to provide a positive distortion fisheye lens to solve at least one of the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a positive distortion fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side in sequence along an optical axis, wherein the first lens, the second lens and the fourth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a planar object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the tenth lens element with a negative refractive index has a concave object-side surface and a convex image-side surface;
the optical imaging lens has only ten lenses with refractive indexes.
Preferably, the image-side surface of the fifth lens and the object-side surface of the sixth lens are cemented with each other, and the following conditional expression is satisfied: and | vd5-vd6| > 25, wherein vd5 is the Abbe coefficient of the fifth lens, and vd6 is the Abbe coefficient of the sixth lens.
Preferably, the image side surface of the seventh lens and the object side surface of the eighth lens are cemented with each other, and the following conditional expression is satisfied: and | vd7-vd8| is more than 40, wherein vd7 is the Abbe coefficient of the seventh lens, and vd8 is the Abbe coefficient of the eighth lens.
Preferably, the image side surface of the ninth lens and the object side surface of the tenth lens are cemented with each other, and the following conditional expressions are satisfied: and | vd9-vd10| is more than 30, wherein vd9 is the Abbe coefficient of the ninth lens, and vd10 is the Abbe coefficient of the tenth lens.
Preferably, the seventh lens and the ninth lens are made of materials with negative temperature coefficient of refractive index dn/dt and meet the following conditional expression: vd7 > 65 and vd9 > 60.
Preferably, the first lens, the second lens, the third lens and the fourth lens are all in a straw hat shape.
Preferably, the second lens and the fourth lens are both glass aspheric lenses, the rest lenses are glass spherical lenses, and a diaphragm is arranged between the sixth lens and the seventh lens.
Preferably, the lens complies with the following conditional expression:
15＜|(f1/f)|＜18，6＜|(f2/f)|＜7，4＜|(f3/f)|＜5，
11＜|(f4/f)|＜12，4＜|(f5/f)|＜5，15＜|(f6/f)|＜19，
3.5＜|(f7/f)|＜4.5，6.5＜|(f8/f)|＜7.5，
3＜|(f9/f)|＜3.5，5.5＜|(f10/f)|＜6.5，
wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9 and f10 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens, respectively.
After adopting the technical scheme, compared with the background technology, the invention has the following advantages:
1. the invention adopts ten lenses along the direction from the object side to the image side, and the lens is matched with a 1/2.3' sensor through the arrangement design of the refractive index and the surface type of each lens, so that 12MP pixels can be supported, the high-definition imaging effect is achieved, and the imaging picture is clear and uniform.
2. The light transmission F/2.2 of the invention has the imaging edge illumination larger than 60 percent, and ensures that the lens can also have good picture brightness when being used in the night environment.
3. The invention has good infrared confocal performance, the lens can realize day and night confocal, the day and night dual-purpose is realized, and the imaging can be ensured to be clear in night mode.
4. The invention has large field angle, adopts positive distortion design, and has f-theta distortion less than + 23%, thereby leading the pixel proportion of the edge to be large and the compressive feeling to be small.
5. The second lens and the fourth lens are both glass aspheric lenses, so that the lens not only can correct distortion, but also has the effect of improving resolution.
Drawings
FIG. 1 is a light path diagram according to the first embodiment;
FIG. 2 is a graph of MTF of the lens in the first embodiment under the visible light of 435nm-656 nm;
FIG. 3 is a defocus graph of the lens in the first embodiment under 435-656 nm of visible light;
FIG. 4 is a defocus graph of the lens in the first embodiment at infrared 850 nm;
FIG. 5 is a graph of curvature of field and distortion at infrared 850nm for a lens according to an embodiment;
FIG. 6 is a graph of relative illumination at infrared 850nm for a lens according to one embodiment;
FIG. 7 is a light path diagram of the second embodiment;
FIG. 8 is a graph of MTF of the lens of the second embodiment in the visible light range from 435nm to 656 nm;
FIG. 9 is a defocus graph of the lens in the second embodiment in the visible light range from 435nm to 656 nm;
FIG. 10 is a defocus graph of the lens of the second embodiment at infrared 850 nm;
FIG. 11 is a graph of field curvature and distortion at infrared 850nm for a lens according to an embodiment;
FIG. 12 is a graph of relative illumination at 546nm for a lens according to one embodiment;
FIG. 13 is a light path diagram of the third embodiment;
FIG. 14 is a graph of MTF of the lens of the third embodiment in the visible light range from 435nm to 656 nm;
FIG. 15 is a defocus graph of the lens in the third embodiment in the visible light range from 435nm to 656 nm;
FIG. 16 is a defocus graph of the lens of the third embodiment at infrared 850 nm;
FIG. 17 is a graph showing the field curvature and distortion of a lens in the third embodiment in the visible light range from 435nm to 656 nm;
FIG. 18 is a graph of relative illumination at 546nm for a lens according to the third embodiment;
FIG. 19 is a light path diagram of the fourth embodiment;
FIG. 20 is a graph showing the MTF curves of the lens of the fourth embodiment in the visible light range from 435nm to 656 nm;
FIG. 21 is a graph showing the defocus curves of the lens in the fourth embodiment in the visible light range from 435nm to 656 nm;
FIG. 22 is a defocus graph of the lens of the fourth embodiment at infrared 850 nm;
FIG. 23 is a graph of curvature of field and distortion under 435-656 nm in visible light for a lens according to the fourth embodiment;
FIG. 24 is a graph of relative illumination at 546nm for the lens of the fourth embodiment.
Description of reference numerals:
the lens system comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10 and an aperture 11.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
In the present specification, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by the gauss theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses a positive distortion fisheye lens, which sequentially comprises a first lens 1 to a tenth lens 10 from an object side A1 to an image side A2 along an optical axis, wherein each of the first lens 1 to the tenth lens 10 comprises an object side surface facing to the object side A1 and allowing imaging light rays to pass and an image side surface facing to the image side A2 and allowing the imaging light rays to pass;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are convex and concave;
the third lens element 3 has a negative refractive index, and the object-side surface and the image-side surface of the third lens element 3 are concave;
the fourth lens element 4 has a negative refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and concave;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a positive refractive index, and the sixth lens element 6 has a concave object-side surface and a convex image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a planar object-side surface and a convex image-side surface;
the eighth lens element 8 has a negative refractive index, and the eighth lens element 8 has a concave object-side surface and a convex image-side surface;
the ninth lens element 9 has a positive refractive index, and the ninth lens element 9 has a convex object-side surface and a convex image-side surface;
the tenth lens element 10 has a negative refractive index, and the tenth lens element 10 has a concave object-side surface and a convex image-side surface;
the optical imaging lens has only ten lenses with refractive indexes.
Preferably, the image-side surface of the fifth lens 5 and the object-side surface of the sixth lens 6 are cemented with each other, and the following conditional expression is satisfied: the | vd5-vd6| > 25, wherein vd5 is the abbe coefficient of the fifth lens 5, and vd6 is the abbe coefficient of the sixth lens 6, and through the combination of high-low dispersion lenses, chromatic aberration can be corrected, day-night confocal is optimized, and the image quality of the lens is improved.
Preferably, the image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are cemented with each other, and the following conditional expression is satisfied: the | vd7-vd8| > 40, wherein vd7 is the abbe coefficient of the seventh lens 7, and vd8 is the abbe coefficient of the eighth lens 8, and through the combination of the high-low dispersion lenses, chromatic aberration can be corrected, day-night confocal is optimized, and the image quality of the lens is improved.
Preferably, the image-side surface of the ninth lens 9 and the object-side surface of the tenth lens 10 are cemented to each other, and the following conditional expression is satisfied: the | vd9-vd10| > 30, wherein vd9 is the abbe coefficient of the ninth lens 9, and vd10 is the abbe coefficient of the tenth lens 10, and through the combination of high-low dispersion lenses, chromatic aberration can be corrected, day-night confocal is optimized, and the image quality of the lens is improved.
Preferably, the seventh lens 7 and the ninth lens 9 are made of a material with a negative temperature coefficient of refractive index dn/dt, that is, the refractive index of the material decreases with increasing temperature, and the following conditional expression is satisfied: vd7 > 65 and vd9 > 60. The seventh lens 7 and the ninth lens 9 can offset the influence of temperature change on the back focal offset of the lens, effectively balance temperature drift, realize no thermalization and ensure that the lens can still clearly image when being used in a temperature range of-40-85 ℃.
Preferably, the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all in a straw hat shape, and meanwhile, diopters of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all negative values, so that light entering from an object space can be collected quickly, a large field angle is realized, and distortion of the lens is controlled.
Preferably, the second lens 2 and the fourth lens 4 are both glass aspheric lenses, the second lens 2 and the fourth lens 4 can correct distortion and improve the effect of resolving power, the rest lenses are glass spherical lenses, and a diaphragm 11 is arranged between the sixth lens 6 and the seventh lens 7.
The equation for the curves of the object-side and image-side surfaces of a glass aspheric lens is as follows:
Figure BDA0003190778810000071
wherein:
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: the curvature of the aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
Figure BDA0003190778810000072
radial distance (radial distance);
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn；
am: mth order QconCoefficient (is the mthQ)con coefficient)；
Qm con: mth order QconPolynomial (the mthQ)con polynomial)。
Preferably, the lens complies with the following conditional expression:
15＜|(f1/f)|＜18，6＜|(f2/f)|＜7，4＜|(f3/f)|＜5，
11＜|(f4/f)|＜12，4＜|(f5/f)|＜5，15＜|(f6/f)|＜19，
3.5＜|(f7/f)|＜4.5，6.5＜|(f8/f)|＜7.5，
3＜|(f9/f)|＜3.5，5.5＜|(f10/f)|＜6.5，
the optical performance of the lens can be improved by reasonably distributing the optical power, wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9 and f10 are the focal length values of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10 respectively.
The positive distortion fisheye lens of the invention will be described in detail below with specific embodiments.
Example one
Referring to fig. 1, the present embodiment discloses a positive distortion fisheye lens, which includes, in order from an object side a1 to an image side a2 along an optical axis, first to tenth lenses 1 to 10, wherein each of the first to tenth lenses 1 to 10 includes an object side surface facing the object side a1 and passing an imaging light ray therethrough and an image side surface facing the image side a2 and passing an imaging light ray therethrough;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are convex and concave;
the third lens element 3 has a negative refractive index, and the object-side surface and the image-side surface of the third lens element 3 are concave;
the fourth lens element 4 has a negative refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and concave;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a positive refractive index, and the sixth lens element 6 has a concave object-side surface and a convex image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a planar object-side surface and a convex image-side surface;
the eighth lens element 8 has a negative refractive index, and the eighth lens element 8 has a concave object-side surface and a convex image-side surface;
the ninth lens element 9 has a positive refractive index, and the ninth lens element 9 has a convex object-side surface and a convex image-side surface;
the tenth lens element 10 has a negative refractive index, and the tenth lens element 10 has a concave object-side surface and a convex image-side surface;
the optical imaging lens only has the ten lenses with the refractive index; the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are mutually glued; the image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are mutually glued; the image side surface of the ninth lens 9 and the object side surface of the tenth lens 10 are mutually cemented; the second lens 2 and the fourth lens 4 are both glass aspheric lenses, the rest lenses are glass spherical lenses, and a diaphragm 11 is arranged between the sixth lens 6 and the seventh lens 7.
Detailed optical data of this embodiment are shown in table 1.
Table 1 detailed optical data of example one
Figure BDA0003190778810000091
Figure BDA0003190778810000101
In this embodiment, the detailed data of the aspheric parameters of the second lens 2 and the fourth lens 4 refer to the following table:
number of noodles K A4 A6 A8 A10 A12 A14 A16
4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14
5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00
8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08
9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08
In this embodiment, the focal length f of the optical system is 1.23mm, the passing light FNO is 2.2, the field angle FOV is 182 °, and the lens is matched with 1/2.3 "sensor, which can support 12MP pixels.
Fig. 1 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 2, which shows that when the spatial frequency of the lens reaches 225lp/mm, the full-field transfer function image is still greater than 30%, the center-to-edge uniformity is high, the imaging quality is excellent, and the resolution of the lens is high. The defocusing curve graph of the visible light of 435nm-656nm refers to fig. 3, the defocusing curve graph of the infrared 850nm refers to fig. 4, and as can be seen from the graphs, the defocusing amount of the lens under the visible light and the infrared light is small, so that the lens can be confocal day and night, and dual-purpose day and night is realized. Please refer to fig. 5 for the field curvature and distortion diagram of the lens under infrared 850nm, and it can be seen from the diagram that the optical distortion is controlled within + 20%, so that the pixel ratio of the edge is large, the compression sense is small, the imaging frame does not have obvious deformation, and the image restoration is more accurate. Referring to fig. 6, it can be seen that the image edge luminance is greater than 60%, which ensures good image brightness even when the lens is used in night environment.
Example two
As shown in fig. 7 to 12, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 2.
Table 2 detailed optical data of example two
Surface of Type (B) Caliber size (diameter) Radius of curvature Thickness of Material of Refractive index Coefficient of dispersion Focal length
OBJ Shot object surface 0.000 Infinity Infinity
1 First lens 24.671 21.329 1.294 TAF3D 1.80420 46.503 -19.886
2 15.920 8.918 3.296
3 Second lens 14.618 13.959 0.700 M-NBFD130 1.80610 40.731 -8.053
4 10.508 4.349 4.054
5 Third lens 10.000 -27.510 0.794 H-FK61 1.49700 81.595 -5.727
6 5.445 3.216 2.339
7 Fourth lens 6.074 19.403 0.700 M-LAC130 1.69350 53.201 -13.987
8 5.632 6.390 0.187
9 Fifth lens element 5.700 5.486 2.248 H-ZF7LA 1.80519 25.477 5.238
10 Sixth lens element 5.700 -15.506 2.947 H-LAK52 1.72916 54.669 20.470
11 6.000 -8.234 1.047
STO 2.348 Infinity 0.025
13 Seventh lens element 2.400 Infinity 1.980 H-ZPK5 1.59281 68.525 4.897
14 Eighth lens element 4.000 -2.913 1.065 E-FDS1 1.92286 20.880 -8.623
15 6.000 -5.372 0.098
16 Ninth lens 3.100 13.875 1.768 H-ZPK2A 1.60300 65.460 3.758
17 Tenth lens 4.000 -2.589 0.859 H-ZF7LA 1.80519 25.477 -7.119
18 6.000 -5.385 3.063
19 Cover glass 4.492 Infinity 0.800 H-K9L 1.51680 64.198
20 4.586 Infinity 0.537
IMA Image plane 4.683 Infinity
In this embodiment, the detailed data of the aspheric parameters of the second lens 2 and the fourth lens 4 refer to the following table:
number of noodles K A4 A6 A8 A10 A12 A14 A16
4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14
5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00
8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08
9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08
In this embodiment, the focal length f of the optical system is 1.23mm, the passing light FNO is 2.2, the field angle FOV is 182 °, and the lens is matched with 1/2.3 "sensor, which can support 12MP pixels.
Fig. 7 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 8, which shows that when the spatial frequency of the lens reaches 225lp/mm, the full-field transfer function image is still greater than 30%, the center-to-edge uniformity is high, the imaging quality is excellent, and the resolution of the lens is high. The defocusing curve graph of the visible light of 435nm-656nm refers to fig. 9, the defocusing curve graph of the infrared 850nm refers to fig. 10, and as can be seen from the graphs, the defocusing amount of the lens under the visible light and the infrared light is small, so that the lens can be confocal day and night, and dual-purpose day and night is realized. Please refer to fig. 11 for the field curvature and distortion diagram of the lens under infrared 850nm, and it can be seen from the diagram that the optical distortion is controlled within + 23%, so that the pixel ratio of the edge is large, the compression sense is small, the imaging frame does not have obvious deformation, and the image restoration is more accurate. Referring to fig. 12, it can be seen that the image edge luminance is greater than 65%, which ensures good image brightness even when the lens is used in the night environment.
EXAMPLE III
As shown in fig. 13 to 18, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 3.
Table 3 detailed optical data of example three
Surface of Type (B) Caliber size (diameter) Radius of curvature Thickness of Material of Refractive index Coefficient of dispersion Focal length
OBJ Shot object surface 0.000 Infinity Infinity
1 First lens 24.294 19.847 1.294 TAF3D 1.80420 46.503 -18.683
2 15.295 8.326 3.348
3 Second lens 14.618 13.959 0.700 M-NBFD130 1.80610 40.731 -8.053
4 10.508 4.349 3.999
5 Third lens 10.000 -28.595 0.943 H-FK61 1.49700 81.595 -5.562
6 5.281 3.104 2.037
7 Fourth lens 6.074 19.403 0.700 M-LAC130 1.69350 53.201 -13.987
8 5.632 6.390 0.147
9 Fifth lens element 5.700 5.393 4.280 H-ZF7LA 1.80519 25.477 5.399
10 Sixth lens element 5.700 -15.155 1.256 H-LAK52 1.72916 54.669 21.020
11 6.000 -7.904 0.934
STO 2.347 Infinity 0.050
13 Seventh lens element 2.400 Infinity 1.935 H-ZPK5 1.59281 68.525 4.840
14 Eighth lens element 4.000 -2.879 0.995 E-FDS1 1.92286 20.880 -8.512
15 6.000 -5.269 0.098
16 Ninth lens 3.100 15.497 1.807 H-ZPK2A 1.60300 65.460 3.725
17 Tenth lens 4.000 -2.522 0.904 H-ZF7LA 1.80519 25.477 -7.162
18 6.000 -5.165 1.779
19 Cover glass 4.297 Infinity 0.800 H-K9L 1.51680 64.198
20 4.380 Infinity 1.821
IMA Image plane 4.687 Infinity
In this embodiment, the detailed data of the aspheric parameters of the second lens 2 and the fourth lens 4 refer to the following table:
number of noodles K A4 A6 A8 A10 A12 A14 A16
4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14
5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00
8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08
9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08
In this embodiment, the focal length f of the optical system is 1.20mm, the passing light FNO is 2.2, the field angle FOV is 182 °, and the lens is matched with 1/2.3 "sensor, which can support 12MP pixels.
Fig. 13 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 14, which shows that when the spatial frequency of the lens reaches 225lp/mm, the full-field transfer function image is still greater than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. The defocusing curve graph of the visible light of 435nm-656nm refers to fig. 15, the defocusing curve graph of the infrared 850nm refers to fig. 16, and as can be seen from the graph, the defocusing amount of the lens under the visible light and the infrared light is small, so that the lens can be confocal day and night, and dual-purpose day and night is realized. Please refer to fig. 17 for the field curvature and distortion diagram of the lens under the visible light 435nm-656nm, and it can be seen from the diagram that the optical distortion is controlled within + 23%, so that the pixel ratio of the edge is large, the compression sense is small, the imaging frame is not obviously deformed, and the image restoration is more accurate. Referring to fig. 18, it can be seen that the image edge luminance is greater than 65%, which ensures good image brightness even when the lens is used in the night environment.
Example four
As shown in fig. 19 to 24, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment are shown in table 4.
Table 4 detailed optical data for example four
Figure BDA0003190778810000131
Figure BDA0003190778810000141
In this embodiment, the detailed data of the aspheric parameters of the second lens 2 and the fourth lens 4 refer to the following table:
number of noodles K A4 A6 A8 A10 A12 A14 A16
4 0.81 0.0002178 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14
5 -0.52 -0.000376 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0
8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08
9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08
In this embodiment, the focal length f of the optical system is 1.20mm, the passing light FNO is 2.2, the field angle FOV is 182 °, and the lens is matched with 1/2.3 "sensor, which can support 12MP pixels.
Fig. 19 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 20, which shows that when the spatial frequency of the lens reaches 225lp/mm, the full-field transfer function image is still greater than 30%, the center-to-edge uniformity is high, the imaging quality is good, and the resolution of the lens is high. The defocusing curve graph of the visible light of 435nm-656nm is shown in fig. 21, the defocusing curve graph of the infrared 850nm is shown in fig. 22, and the defocusing amount of the lens under the visible light and the infrared light is small, so that the lens can be confocal day and night, and dual-purpose day and night is realized. Please refer to fig. 23 for the field curvature and distortion diagram of the lens under the visible light 435nm-656nm, and it can be seen from the diagram that the optical distortion is controlled within + 23%, so that the pixel ratio of the edge is large, the compression sense is small, the imaging frame is not obviously deformed, and the image restoration is more accurate. Referring to fig. 24, it can be seen that the image edge luminance is greater than 65%, which ensures good image brightness even when the lens is used in the night environment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. The positive distortion fisheye lens is characterized by sequentially comprising a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the fourth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a planar object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the ninth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the tenth lens element with a negative refractive index has a concave object-side surface and a convex image-side surface;
the optical imaging lens has only ten lenses with refractive indexes.
2. A positive distortion fisheye lens as claimed in claim 1, wherein the image side of the fifth lens element and the object side of the sixth lens element are cemented together, and the following conditional expressions are satisfied: and | vd5-vd6| > 25, wherein vd5 is the Abbe coefficient of the fifth lens, and vd6 is the Abbe coefficient of the sixth lens.
3. A positive distortion fisheye lens as claimed in claim 1, wherein the image side of the seventh lens element and the object side of the eighth lens element are cemented to each other, and the following conditional expressions are satisfied: and | vd7-vd8| is more than 40, wherein vd7 is the Abbe coefficient of the seventh lens, and vd8 is the Abbe coefficient of the eighth lens.
4. A positive distortion fisheye lens as claimed in claim 1, wherein the image side of the ninth lens element and the object side of the tenth lens element are cemented together, and the following conditional expressions are satisfied: and | vd9-vd10| is more than 30, wherein vd9 is the Abbe coefficient of the ninth lens, and vd10 is the Abbe coefficient of the tenth lens.
5. A positive distortion fisheye lens as claimed in claim 1, wherein the seventh lens and the ninth lens are made of a material having a negative temperature coefficient of refractive index dn/dt and satisfy the following conditional expression: vd7 is more than 65, vd9 is more than 60, wherein vd7 is the Abbe coefficient of the seventh lens, and vd9 is the Abbe coefficient of the ninth lens.
6. A positive distortion fisheye lens as claimed in claim 1, wherein the first, second, third and fourth lenses are all in the shape of a hat.
7. A positive distortion fisheye lens as claimed in claim 1, wherein the second lens and the fourth lens are both glass aspheric lenses, the remaining lenses are glass spherical lenses, and a diaphragm is provided between the sixth lens and the seventh lens.
8. A positive distortion fisheye lens as claimed in claim 1, characterized in that the following condition is satisfied:
15＜|(f1/f)|＜18，6＜|(f2/f)|＜7，4＜|(f3/f)|＜5，
11＜|(f4/f)|＜12，4＜|(f5/f)|＜5，15＜|(f6/f)|＜19，
3.5＜|(f7/f)|＜4.5，6.5＜|(f8/f)|＜7.5，
3＜|(f9/f)|＜3.5，5.5＜|(f10/f)|＜6.5，
wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9 and f10 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens, respectively.
CN202110877205.8A 2021-07-31 2021-07-31 Positive distortion fisheye lens Pending CN113419332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110877205.8A CN113419332A (en) 2021-07-31 2021-07-31 Positive distortion fisheye lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110877205.8A CN113419332A (en) 2021-07-31 2021-07-31 Positive distortion fisheye lens

Publications (1)

Publication Number Publication Date
CN113419332A true CN113419332A (en) 2021-09-21

Family

ID=77718688

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110877205.8A Pending CN113419332A (en) 2021-07-31 2021-07-31 Positive distortion fisheye lens

Country Status (1)

Country Link
CN (1) CN113419332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI790016B (en) * 2021-11-29 2023-01-11 今國光學工業股份有限公司 Eight-piece wide-angle lens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110542994A (en) * 2019-09-10 2019-12-06 厦门力鼎光电股份有限公司 fisheye lens
CN210294656U (en) * 2019-09-10 2020-04-10 厦门力鼎光电股份有限公司 Fisheye lens
CN210348046U (en) * 2019-09-29 2020-04-17 厦门力鼎光电股份有限公司 Fisheye lens
CN211086776U (en) * 2020-01-10 2020-07-24 厦门力鼎光电股份有限公司 Fisheye lens
CN211375165U (en) * 2020-02-19 2020-08-28 厦门力鼎光电股份有限公司 Fisheye imaging lens
CN213069313U (en) * 2020-10-13 2021-04-27 厦门力鼎光电股份有限公司 High-image-quality optical imaging lens
CN215340516U (en) * 2021-07-31 2021-12-28 厦门力鼎光电股份有限公司 Positive distortion fisheye lens

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110542994A (en) * 2019-09-10 2019-12-06 厦门力鼎光电股份有限公司 fisheye lens
CN210294656U (en) * 2019-09-10 2020-04-10 厦门力鼎光电股份有限公司 Fisheye lens
CN210348046U (en) * 2019-09-29 2020-04-17 厦门力鼎光电股份有限公司 Fisheye lens
CN211086776U (en) * 2020-01-10 2020-07-24 厦门力鼎光电股份有限公司 Fisheye lens
CN211375165U (en) * 2020-02-19 2020-08-28 厦门力鼎光电股份有限公司 Fisheye imaging lens
CN213069313U (en) * 2020-10-13 2021-04-27 厦门力鼎光电股份有限公司 High-image-quality optical imaging lens
CN215340516U (en) * 2021-07-31 2021-12-28 厦门力鼎光电股份有限公司 Positive distortion fisheye lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI790016B (en) * 2021-11-29 2023-01-11 今國光學工業股份有限公司 Eight-piece wide-angle lens

Similar Documents

Publication Publication Date Title
CN109239891B (en) Optical imaging lens group
WO2018006592A1 (en) Wide angle photographic lens
CN106932888B (en) 360-degree panoramic fisheye lens
CN110007447B (en) Fixed focus lens
CN111929861B (en) High-definition fish-eye lens
CN108279484B (en) Optical imaging system
CN214669836U (en) High-resolution glass-plastic mixed fisheye lens
CN213987004U (en) Be applied to fisheye camera lens of VR panorama concatenation
CN113341543A (en) Large-image-surface athermal optical imaging lens
CN215340516U (en) Positive distortion fisheye lens
CN111722378B (en) Large-image-surface high-resolution fish-eye lens
CN212276084U (en) High definition fisheye lens
CN113419332A (en) Positive distortion fisheye lens
CN216387547U (en) Fisheye lens
CN216285934U (en) Compact high-illumination high-definition imaging lens
CN215067495U (en) Large-image-surface athermal optical imaging lens
CN215895097U (en) Monitoring lens in short-focus vehicle carrying vehicle
CN216485760U (en) Long-focus lens with large target surface
CN216622831U (en) Wide-angle reverse-distance day and night confocal lens
CN214751080U (en) Zooming security monitoring lens
CN212321968U (en) Large-image-plane high-resolution fisheye lens
CN214151210U (en) Large-target-surface imaging lens
CN212276080U (en) Small-size optical imaging lens who leads to light greatly
CN114153059A (en) Long-focus lens with large target surface
CN212623294U (en) Large wide-angle low-distortion video optical system and 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