CN220730512U - 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens - Google Patents
160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens Download PDFInfo
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
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- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
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Abstract
The utility model relates to a long-wave infrared optical lens, in particular to a 160-DEG ultra-wide-angle four-piece type long-wave infrared athermalized fisheye lens, which aims to solve the problems that the prior art does not have athermalized performance and has lower relative illuminance. The utility model includes a lens assembly and a frame assembly; the lens component comprises a first lens, a second lens, a third lens, a fourth lens, an aperture diaphragm and a filter lens which are sequentially arranged along the transmission direction of incident light; the frame assembly comprises a lens barrel, a plurality of lens frames and pressing rings, and a spacer ring, wherein the lens frames and the pressing rings are arranged on the inner wall of the lens barrel and used for fixing the lens assembly, and the spacer ring is used for separating the second lens from the third lens. The first lens is a concave-convex lens, the second lens and the third lens are concave-convex lenses, and the fourth lens is a biconvex lens. According to the utility model, through reasonable layout of four lenses, 160-degree ultra-wide angle view finding is realized, light transmittance and relative illuminance are increased, imaging effect is optimized, and production cost of the lenses is reduced.
Description
Technical Field
The utility model relates to a long-wave infrared optical lens, in particular to a 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens.
Background
A fisheye lens (also referred to as an panoramic lens) is an extreme wide-angle lens, the focal length of which is generally 16mm or less, and the viewing angle range of which is generally 120 degrees or more. The working surface of the front lens of the photographic lens is small in radius, and protrudes towards the front of the lens in a parabolic shape, so that the front lens is very similar to eyes of fishes. However, the imaging of the fisheye lens has unavoidable barrel distortion, so that the scenery of the edge field of view is deformed to a certain extent except for the scenery of the center field of view which is basically unchanged, and therefore, the imaging of the fisheye lens is greatly different from the real world scene in the human eye, and is quite unfavorable for the application of the fisheye lens in the fields of industrial production or measurement and the like.
The temperature can seriously affect the performance of the infrared optical material, and in order to ensure the imaging quality of the infrared optical system in different temperature environments, athermalization design is needed, and common athermalization design technologies include an electronic active athermalization technology, a mechanical passive athermalization technology and an optical passive athermalization technology, wherein the principle of the optical passive athermalization technology is that the focal length variation of a lens at different temperatures is the same as the structural material variation along with the temperature by selecting proper optical material and structural material collocation, the system complexity is not increased, and the athermalization design method has the advantages of simple structure, light weight and high reliability and is a preferred scheme for athermalization design of the optical system.
The existing fisheye lens commonly adopts a lens composed of eight or more lenses, and has the following problems: the lens has a complex structure and a large number of lenses, so that the light transmittance of the lens is low, and the lens has good imaging performance only at normal temperature.
Chinese patent CN204462517U discloses a three-piece 150-degree fisheye long-wave infrared lens comprising a first lens, a second lens and a third lens. The first lens is a meniscus lens with negative focal power, the convex surface of the first lens faces the object side, the concave surface of the first lens is an aspheric surface, the second lens is a meniscus lens with positive focal power, the convex surface of the second lens faces the image side, the convex surface of the second lens is an aspheric surface, the third lens is a plano-convex lens with positive focal power, and the convex surface of the third lens faces the image side. However, the prior art has the following problems: does not have athermalization properties; the relative illuminance is low, resulting in insufficient brightness at the image plane edge.
Disclosure of Invention
The utility model aims to solve the problems that the prior art does not have athermalization performance and has low relative illuminance, and provides a 160-DEG ultra-wide-angle four-piece type long-wave infrared athermalization fisheye lens.
The design idea of the utility model is as follows: a reverse-shooting far-distance optical system is formed by reasonably arranging a first lens, a second lens, a third lens, a fourth lens and a filter lens, and then a 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens is formed by assembling with a frame component; the lens component is made of proper optical materials, and the frame component is made of proper structural materials so as to realize the achromatism and athermalization functions of the optical system, so that the fisheye lens has better light transmittance under the condition of less lenses.
In order to achieve the above purpose, the technical solution provided by the present utility model is:
A160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens is characterized in that:
comprising a lens assembly and a frame assembly; the lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, an aperture diaphragm and a filter lens which are sequentially arranged along the transmission direction of incident light; the first lens is a round concave-convex lens with negative focal power, and the object side surface of the first lens is a convex surface; the second lens and the third lens are round concave-convex lenses with positive focal power, and the object side surfaces of the second lens and the third lens are concave surfaces; the fourth lens is a circular biconvex lens with positive focal power; the filter lens is a circular plane mirror; the object side surface of the second lens, the image side surface of the third lens and the object side surface of the fourth lens are all even-order aspheric surfaces; the first lens, the second lens, the third lens, the fourth lens and the filter lens are sequentially arranged in the frame assembly along the light path.
Further, the frame assembly comprises a lens barrel, a plurality of lens frames and pressing rings, and a spacing ring, wherein the lens frames and the pressing rings are arranged on the inner wall of the lens barrel and used for fixing the lens assembly, and the spacing ring is used for separating the second lens from the third lens; the lens cone is formed by sequentially connecting a hollow first cylinder, a cone frustum and a second cylinder, wherein the radius of the bottom surface of the first cylinder is the same as the radius of the large end of the cone frustum, and the radius of the bottom surface of the second cylinder is the same as the radius of the small end of the cone frustum; the glasses frame, the spacing ring and the pressing ring are all annular assemblies; the first lens is arranged at one end of the first cylinder close to the object side, the second lens is arranged at one side of the second cylinder close to the truncated cone, the filter lens is arranged at one end of the second cylinder close to the image side through a pressing ring, the fourth lens is arranged at a position of the second cylinder close to the filter lens, and the third lens is arranged at a position of the second cylinder close to the fourth lens; the space ring is arranged in the second cylinder and is positioned between the lens frames for installing the second lens and the third lens.
Further, the focal length f 'of the first lens' 1 The method meets the following conditions: -3.5f’<f’ 1 <-2.5f'; the focal length f 'of the second lens' 2 The method meets the following conditions: 88f'<f’ 2 <89f'; the focal length f 'of the third lens' 3 The method meets the following conditions: -48f'<f’ 3 <-47f'; focal length f 'of the fourth lens' 4 The method meets the following conditions: 4f'<f’ 4 <5f’。
Further, the radius of curvature R of the first lens object-side surface 1 The method meets the following conditions: 7f'<R 1 <8f', radius of curvature R of image side 2 The method meets the following conditions: 3f'<R 2 <4f'; radius of curvature R of object side surface of second lens 3 The method meets the following conditions: -11.5f'<R 3 <-10.5f', radius of curvature R of the image side 4 The method meets the following conditions: -11f'<R 4 <-10f'; radius of curvature R of object side surface of third lens 5 The method meets the following conditions: -19f'<R 5 <-18.5f', radius of curvature R of the image side surface 6 The method meets the following conditions: -29.5f'<R 6 <-29f'; radius of curvature R of object side surface of fourth lens 7 The method meets the following conditions: 11f'<R 7 <12f', radius of curvature R of image side 8 The method meets the following conditions: -19f'<R 8 <-18.5f’。
Further, the refractive index n of the first lens 1 The method meets the following conditions: 3.9<n 1 <4, a step of; refractive index n of the second lens 2 The method meets the following conditions: 2.3<n 2 <2.5; refractive index n of the third lens 3 The method meets the following conditions: 2.1<n 3 <2.3; refractive index n of the fourth lens 4 The method meets the following conditions: 2.5<n 4 <2.7。
Further, the lens cone, the lens frame, the spacing ring and the pressing ring are all made of aluminum alloy, and the rigidity is high.
Further, the length of the lens barrel is 44.20mm.
Further, at least four mounting rings are uniformly distributed on the outer wall of the second cylinder and are used for being connected with other components.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model adopts four lenses and a filter lens, and the specific layout is as follows: the first lens, the second lens, the third lens, the fourth lens, the aperture diaphragm and the filter lens are sequentially arranged along the transmission direction of incident light, and through the reasonable layout, 160-degree ultra-wide angle framing is realized, the light transmittance and the relative illuminance are increased, the imaging effect is optimized, and the production cost of the lens is reduced; the aperture diaphragm is moved backwards, so that the size of the lens is reduced;
2. in the utility model, the object side surface of the second lens, the image side surface of the third lens and the object side surface of the fourth lens are all even-order aspheric surfaces, so that the effect of correcting the residual aberration of the lens is achieved;
3. in the utility model, the lens cone, the lens frame, the spacing ring and the pressing ring are all made of aluminum alloy, so that the rigidity is high; the optical system of the utility model realizes achromatism and athermalization functions and has athermalization performance by reasonable collocation with the lens materials, and the fisheye lens has better imaging in the working temperature range (-20 ℃ to 40 ℃) and the working wavelength range (8.0 to 14.0 mu m); and the imaging quality does not change obviously along with the temperature change in the working temperature range.
Drawings
FIG. 1 is a schematic view of a cross-sectional structure along an axial direction according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a cross-sectional structure along the axial direction (with specific parameters shown) according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of the optical principle of a lens assembly according to an embodiment of the present utility model;
FIG. 4 is a graph of relative illuminance according to an embodiment of the present utility model;
FIG. 5 is a graph of field curvature and distortion values, wherein (a) is the field curvature and (b) is the distortion value;
FIG. 6 is a graph of MTF at-20℃for an example of the present utility model;
FIG. 7 is a graph of MTF at 20deg.C for an embodiment of the present utility model;
FIG. 8 is a graph of MTF at 40℃for an example of the present utility model;
FIG. 9 is an energy diagram of an enclosure circle according to an embodiment of the utility model;
fig. 1 to 3 reference numerals illustrate: 1-lens assembly, 11-first lens, 12-second lens, 13-third lens, 14-fourth lens; 2-frame assembly, 21-lens barrel, 211-first cylinder, 212-truncated cone, 213-second cylinder, 2101-mounting ring, 22-mirror frame, 23-spacer, 24-press ring; 3-a filter lens; 4-aperture stop.
Detailed Description
The utility model will be further described with reference to the drawings and specific examples.
A 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens, see fig. 1-3, comprises a lens component 1 and a frame component 2; the lens assembly 1 comprises a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, an aperture diaphragm 4 and a filter lens 3 which are sequentially arranged along the propagation direction of incident light; the first lens 11 is a round concave-convex lens with negative focal power, and the object side surface of the first lens is a convex surface; the second lens 12 and the third lens 13 are round concave-convex lenses with positive focal power, and the object side surfaces of the second lens and the third lens are concave surfaces; the fourth lens 14 is a circular biconvex lens having positive optical power; the filter lens 3 is a circular plane mirror; the object side surface of the second lens element 12, the image side surface of the third lens element 13 and the object side surface of the fourth lens element 14 are aspheric; the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the filter lens 3 are sequentially arranged in the frame assembly 2 along the light path.
The frame assembly 2 comprises a lens barrel 21, a plurality of lens frames 22 and a pressing ring 24 which are arranged on the inner wall of the lens barrel 21 and used for fixing the lens assembly 1, and a spacing ring 23 used for separating the second lens 12 and the third lens 13; the lens barrel 21 is formed by sequentially connecting a hollow first cylinder 211, a truncated cone 212 and a second cylinder 213, wherein the radius of the bottom surface of the first cylinder 211 is the same as the radius of the large end of the truncated cone 212, and the radius of the bottom surface of the second cylinder 213 is the same as the radius of the small end of the truncated cone 212; the mirror frame 22, the spacing ring 23 and the pressing ring 24 are all annular components; the first lens 11 is disposed at one end of the first cylinder 211 near the object side, the second lens 12 is disposed at one side of the second cylinder 213 near the truncated cone 212, the filter lens 3 is disposed at one end of the second cylinder 213 near the image side through a pressing ring 24, the fourth lens 14 is disposed at a position in the second cylinder 213 near the filter lens 3, and the third lens 13 is disposed at a position in the second cylinder 213 near the fourth lens 14; the spacer 23 is disposed in the second cylinder 213 between the frames 22 in which the second lens 12 and the third lens 13 are mounted.
Specific parameters of each lens in this embodiment are as follows:
the radius of curvature of the object side of the first lens 11 is 17.73mm, and the radius of curvature of the image side is 8.77mm; the second lens element 12 has an object-side radius of curvature of-25.75 mm and an image-side radius of curvature of-25.00 mm; the radius of curvature of the object side of the third lens element 13 is-44.54 mm, and the radius of curvature of the image side is-68.89 mm; the fourth lens element 14 has an object-side radius of curvature of 27.09mm and an image-side radius of curvature of-44.39 mm. The thickness of the first lens 11 is 1.95mm, the thickness of the second lens 12 is 2.49mm, the thickness of the third lens 13 is 2.2mm, and the thickness of the fourth lens 14 is 2.67mm. The distance between the first lens 11 and the second lens 12 is 22.54mm, the distance between the second lens 12 and the third lens 13 is 11.80mm, the distance between the third lens 13 and the fourth lens 14 is 0.30mm, and the distance between the fourth lens 14 and the aperture stop 4 is 0.20mm; the distance between the aperture stop 4 and the filter 3 is 0.40mm.
The materials of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 are Ge, znSe, znS and IRG207 in sequence; the lens barrel 21, the lens frame 22, the spacer 23 and the pressing ring 24 are all made of aluminum alloy. Through reasonable collocation of the materials, the optical system realizes the achromatism and athermalization functions, wherein Ge plays a main achromatism role, and IRG207 plays a main athermalization role. In practical application, the above materials may be replaced by other materials having similar properties.
The focal length of the optical system composed of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 is about 2.40mm, and the f-number is about 1.30. The length of the lens barrel 21 is 44.20mm.
Four mounting rings 2101 are uniformly distributed on the outer wall of the second cylinder 213 and are used for connecting with other components.
FIGS. 4-9 are diagrams of test data according to embodiments of the present utility model; fig. 4 shows the relative illuminance values of different fields of view of the fisheye lens with respect to 0 field of view, wherein the abscissa represents the field angle, and the ordinate represents the relative illuminance value, as can be seen from fig. 4, the illuminance of the edge field is 0.94 times that of the center field, and the illuminance of the image plane is uniform; fig. 5 (a) shows the field curvature values of different fields of view, wherein the abscissa shows the field curvature values, the ordinate shows the field angle, and the data when the wavelengths of the incident light are 8 μm, 10 μm, 11 μm, 12 μm, and 14 μm are sequentially shown from left to right, fig. 5 (b) is a system distortion chart, shows the distortion values of different fields of view, the abscissa shows the relative distortion values, and the ordinate shows the field angle, and although the fisheye lens still has a certain degree of distortion, the distortion of the edge field of view can be corrected by using an image processing technique in the later stage; fig. 6, 7 and 8 sequentially show the transmission sizes of the fisheye lens at-20 ℃, 20 ℃ and 40 ℃ for different spatial frequencies, wherein the abscissa represents the spatial frequency, and the ordinate represents the spatial frequency transmission coefficient of the system, and as can be seen from fig. 6, 7 and 8, the optical transmission functions of the fisheye lens at different temperatures are not obviously changed and all approach to the diffraction limit; fig. 9 shows the energy of the fisheye lens in circles with different radii, wherein the abscissa represents the radius of the circle with the centroid as the origin, and the ordinate represents the energy of the surrounding circle, and as can be seen from fig. 9, 80% of the energy in the full field of view is concentrated within 16.5 μm of the radius, and the energy concentration is high.
The utility model adopts four lenses and one filter lens 3, and the specific layout is as follows: the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the aperture diaphragm 4 and the filter lens 3 are sequentially arranged along the transmission direction of incident light, and through the reasonable layout, 160-degree ultra-wide angle framing is realized, the light transmittance and the relative illuminance are increased, the imaging effect is optimized, and the production cost of the lens is reduced; and the aperture stop 4 is moved backward, reducing the size of the lens. The object side surface of the second lens element 12, the image side surface of the third lens element 13 and the object side surface of the fourth lens element 14 are aspheric, and function in correcting residual aberration of the lens assembly. The first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 are made of Ge, znSe, znS and IRG207 in sequence, and the lens barrel 21, the lens frame 22, the spacing ring 23 and the pressing ring 24 are made of aluminum alloy; through reasonable collocation of the materials, the optical system of the utility model realizes the achromatism and athermalization functions, has athermalization performance, and has better imaging of the fish-eye lens in the working temperature range (-20 ℃ to 40 ℃) and the working wavelength range (8.0 to 14.0 mu m); and the imaging quality does not change obviously along with the temperature change in the working temperature range.
Claims (8)
1. 160 ultra wide angle's four formula long wave infrared athermalization fisheye lenses, its characterized in that:
comprises a lens assembly (1) and a frame assembly (2);
the lens assembly (1) comprises a first lens (11), a second lens (12), a third lens (13), a fourth lens (14), an aperture diaphragm (4) and a filter lens (3) which are sequentially arranged along the transmission direction of incident light;
the first lens (11) is a round concave-convex lens with negative focal power, and the object side surface of the first lens is a convex surface; the second lens (12) and the third lens (13) are round concave-convex lenses with positive focal power, and the object side surfaces of the second lens and the third lens are concave surfaces; the fourth lens (14) is a circular biconvex lens with positive optical power; the filter lens (3) is a circular plane mirror; the object side surface of the second lens (12), the image side surface of the third lens (13) and the object side surface of the fourth lens (14) are all even-order aspheric surfaces;
the first lens (11), the second lens (12), the third lens (13), the fourth lens (14) and the filter lens (3) are sequentially arranged in the frame assembly (2) along the light path.
2. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 1, wherein the lens is characterized by:
the frame assembly (2) comprises a lens barrel (21), a plurality of lens frames (22) and a pressing ring (24) which are arranged on the inner wall of the lens barrel (21) and used for fixing the lens assembly (1), and a spacing ring (23) used for separating the second lens (12) and the third lens (13);
the lens cone (21) is formed by sequentially connecting a hollow first cylinder (211), a cone frustum (212) and a second cylinder (213), wherein the radius of the bottom surface of the first cylinder (211) is the same as the radius of the large end of the cone frustum (212), and the radius of the bottom surface of the second cylinder (213) is the same as the radius of the small end of the cone frustum (212); the glasses frame (22), the spacing ring (23) and the pressing ring (24) are all annular components;
the first lens (11) is arranged at one end of the first cylinder (211) close to the object side, the second lens (12) is arranged at one side of the second cylinder (213) close to the truncated cone (212), the filter lens (3) is arranged at one end of the second cylinder (213) close to the image side through a pressing ring (24), the fourth lens (14) is arranged at a position in the second cylinder (213) close to the filter lens (3), and the third lens (13) is arranged at a position in the second cylinder (213) close to the fourth lens (14); the space ring (23) is arranged in the second cylinder (213) and is positioned between the lens frame (22) for mounting the second lens (12) and the third lens (13).
3. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 2, wherein the lens is characterized in that:
the focal length f 'of the first lens (11)' 1 The method meets the following conditions: -3.5f'<f’ 1 <-2.5f’；
The focal length f 'of the second lens (12)' 2 The method meets the following conditions: 88f'<f’ 2 <89f’；
The focal length f 'of the third lens (13)' 3 The method meets the following conditions: -48f'<f’ 3 <-47f’；
The focal length f 'of the fourth lens (14)' 4 The method meets the following conditions: 4f'<f’ 4 <5f’。
4. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 3, wherein the lens is characterized by:
radius of curvature R of object side surface of first lens (11) 1 The method meets the following conditions: 7f'<R 1 <8f', image sideRadius of curvature R of face 2 The method meets the following conditions: 3f'<R 2 <4f’；
Radius of curvature R of object side surface of second lens (12) 3 The method meets the following conditions: -11.5f'<R 3 <-10.5f', radius of curvature R of the image side 4 The method meets the following conditions: -11f'<R 4 <-10f’；
Radius of curvature R of object side surface of third lens (13) 5 The method meets the following conditions: -19f'<R 5 <-18.5f', radius of curvature R of the image side surface 6 The method meets the following conditions: -29.5f'<R 6 <-29f’；
Radius of curvature R of object side surface of fourth lens (14) 7 The method meets the following conditions: 11f'<R 7 <12f', radius of curvature R of image side 8 The method meets the following conditions: -19f'<R 8 <-18.5f’。
5. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 4, wherein the lens is characterized by:
refractive index n of the first lens (11) 1 The method meets the following conditions: 3.9<n 1 <4；
Refractive index n of the second lens (12) 2 The method meets the following conditions: 2.3<n 2 <2.5；
Refractive index n of the third lens (13) 3 The method meets the following conditions: 2.1<n 3 <2.3；
Refractive index n of the fourth lens (14) 4 The method meets the following conditions: 2.5<n 4 <2.7。
6. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 1 or 2, wherein the lens is characterized in that:
the lens cone (21), the lens frame (22), the spacing ring (23) and the pressing ring (24) are all made of aluminum alloy.
7. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 1 or 2, wherein the lens is characterized in that:
the length of the lens barrel (21) is 44.20mm.
8. The 160-degree ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens according to claim 1 or 2, wherein the lens is characterized in that:
at least four mounting rings (2101) are uniformly distributed on the outer wall of the second cylinder (213).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322178508.8U CN220730512U (en) | 2023-08-14 | 2023-08-14 | 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322178508.8U CN220730512U (en) | 2023-08-14 | 2023-08-14 | 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens |
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| Publication Number | Publication Date |
|---|---|
| CN220730512U true CN220730512U (en) | 2024-04-05 |
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| CN202322178508.8U Active CN220730512U (en) | 2023-08-14 | 2023-08-14 | 160-DEG ultra-wide angle four-piece type long-wave infrared athermalized fisheye lens |
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| Country | Link |
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| CN (1) | CN220730512U (en) |
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- 2023-08-14 CN CN202322178508.8U patent/CN220730512U/en active Active
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