CN218824938U - Infrared athermalization camera lens of adaptation 4K resolution ratio subassembly - Google Patents
Infrared athermalization camera lens of adaptation 4K resolution ratio subassembly Download PDFInfo
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- CN218824938U CN218824938U CN202223577962.2U CN202223577962U CN218824938U CN 218824938 U CN218824938 U CN 218824938U CN 202223577962 U CN202223577962 U CN 202223577962U CN 218824938 U CN218824938 U CN 218824938U
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Abstract
The utility model relates to an infrared no thermalization camera lens of adaptation 4K resolution ratio subassembly belongs to optical imaging technical field, has solved the problem that can't satisfy the thermal infrared imager demand of high resolution, big visual field, lightweight in the market among the prior art. The infrared athermalization lens comprises a first lens, a second lens, a third lens and a fourth lens; are respectively arranged once from left to right along the optical axis; the first lens and the fourth lens are convex lenses, and the second lens and the third lens are concave lenses; at least one of the four lenses is chalcogenide glass; at least one of the eight mirror surfaces in the four lenses is a diffraction surface and at least one of the mirror surfaces is an aspheric surface. The non-refrigeration infrared detector adaptive to the 4K ultrahigh resolution is realized, the excellent imaging quality can be ensured in a wider temperature range without focusing, and the non-refrigeration infrared detector has a wider field range compared with other lenses with the same focal length.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an infrared athermal camera lens of adaptation 4K resolution ratio subassembly.
Background
With the continuous progress of infrared technology, the resolution of infrared detectors is also continuously improved. At present, the uncooled infrared lenses on the market are designed for matching detectors with resolution of 1K or below, and the requirements of thermal infrared imagers with high resolution, large view field and light weight on the market can not be met gradually. The lens can be used for a 4096 multiplied by 2160 4K ultra-high resolution uncooled infrared detector, so that the field angle and the acting distance of the thermal infrared imager are remarkably improved, and the market application potential of the thermal infrared imager is further released.
Because the refractive index temperature coefficient dn/dT of the infrared material is larger than that of a visible light material, the infrared lens is more sensitive to temperature change than the visible light lens, and the image surface is subjected to temperature drift due to the larger temperature difference, so that the image contrast is obviously reduced. In order to adapt to a large environmental temperature difference, a focusing lens is often arranged to compensate for image plane drift generated by the temperature difference, a manual or electric focusing mechanism needs to be added in the mode, the structure is complex and heavy, and the light-weight requirement of the thermal infrared imager is not facilitated.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing analysis, the utility model aims to provide an infrared no thermalization camera lens of adaptation 4K resolution ratio subassembly for can't satisfy the problem to high resolution, big visual field, lightweight thermal infrared imager demand in the market among the solution prior art.
The purpose of the utility model is mainly realized through the following technical scheme: the infrared athermalization lens comprises a first lens, a second lens, a third lens and a fourth lens; are respectively arranged once from left to right along the optical axis; the first lens and the fourth lens are convex lenses, and the second lens and the third lens are concave lenses;
at least one of the four lenses is chalcogenide glass;
at least one of the eight mirror surfaces in the four lenses is a diffraction surface and at least one of the eight mirror surfaces is an aspheric surface.
Further, the infrared athermal lens further comprises an aperture diaphragm;
the aperture stop is positioned on the front surface of the second lens or the back surface of the second lens.
Further, the diffraction surface is provided on a mirror surface having an aspherical surface type;
the preferable lens surface types of the infrared athermalization lens are as follows: the front surfaces of the first lens, the third lens and the fourth lens are all spherical surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are all aspheric surfaces, the front surface and the rear surface of the second lens are both aspheric surfaces, and diffraction surfaces are arranged on the aspheric surfaces of the front surfaces.
Further, the preferred lens surface types of the infrared athermalization lens are as follows: the front surfaces of the first lens, the third lens and the fourth lens are aspheric surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are spherical surfaces, the front surface and the rear surface of the second lens are aspheric surfaces, and diffraction surfaces are arranged on the aspheric surfaces of the front surfaces.
Further, the aspheric surface type expression is as follows:
wherein Z is the rise of the relative point of the aspheric surface, R is the radius of curvature of the aspheric surface, C 0 K is a conic coefficient, Y is the distance between a point on the aspheric surface and the optical axis, A, B, C, D, 8230M are high-order term coefficients of each aspheric surface, and i is any positive integer.
Furthermore, the focal length value f of the infrared athermalization lens is within the range of 40mm to 60mm.
Further, the range of the aperture value F is: f is more than or equal to 0.8 and less than or equal to 1.3.
Further, the ranges of the curvature radius of each mirror surface are respectively as follows: the curvature radius of the front surface of the first lens is within the range of 26.831mm and 49.829mm, the curvature radius of the rear surface of the first lens is within the range of 41.72mm and 77.48mm, the curvature radius of the front surface of the second lens is within the range of 18.046mm and 33.514mm, the curvature radius of the rear surface of the second lens is within the range of 14.035mm and 26.065mm, and the curvature radius of the front surface and the curvature radius of the rear surface of the third lens are negative.
Further, the thickness ranges of the lenses are as follows: the first lens thickness ranges from [5.2mm,11.2mm ], the second lens thickness ranges from [2.5mm,8.5mm ], the third lens thickness ranges from [2.5mm,8.5mm ], and the fourth lens thickness ranges from [3.9mm,9.9mm ].
Further, the interval range between the adjacent lenses is: the first lens and the second lens are spaced in the range of [0.1mm,7.15mm ], the second lens and the third lens are spaced in the range of [12.11mm,22.11mm ], the third lens and the fourth lens are spaced in the range of [12.25mm,22.25mm ], and the fourth lens and the detector protection window are spaced in the range of [8.3mm,18.3mm ].
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
an infrared athermalization lens adaptive to a k resolution assembly is characterized in that a chalcogenide glass and a germanium material are subjected to diamond turning to form an aspheric surface and a diffraction surface, the chalcogenide glass and the diffraction surface have good achromatic and athermalization performances, so that the infrared athermalization lens can keep image surface consistency and better image contrast without focusing within the range of-40 ℃ to +80 ℃, and the volume and the weight of the infrared athermalization lens are effectively reduced.
The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
FIG. 1 is a schematic view of an optical system according to embodiment 1 of the present application;
FIG. 2 is a MTF curve at +20 ℃ for example 1 of the present application;
FIG. 3 is a MTF curve at-40 ℃ for example 1 herein;
FIG. 4 is a MTF curve at +80 ℃ for example 1 of the present application;
fig. 5 is a schematic view of an optical system according to embodiment 2 of the present application.
Reference numerals:
1-a first lens; 2-aperture diaphragm; 3-a second lens; 4-a third lens; 5-a fourth lens;
6-detector protection window; 7-detector imaging plane.
Detailed Description
The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The utility model discloses a specific embodiment discloses an infrared athermalization camera lens of adaptation 4K resolution ratio subassembly, as shown in FIG. 1.
Example 1
The infrared athermalization lens comprises a first lens, a second lens, a third lens and a fourth lens; are respectively arranged once from left to right along the optical axis; the first lens and the fourth lens are convex lenses, and the second lens and the third lens are concave lenses;
at least one of the four lenses is chalcogenide glass;
at least one of the eight mirror surfaces in the four lenses is a diffraction surface and at least one of the eight mirror surfaces is an aspheric surface.
Specifically, at least one of the four lenses is made of chalcogenide glass; the other lenses are made of germanium materials, and the arrangement quantity of the chalcogenide glass in the infrared athermal lens is as follows:
wherein, X is the arrangement number of chalcogenide glass in the infrared athermalization lens, n is the number of lenses forming the infrared athermalization lens, X is the number of lenses made of chalcogenide glass material, and X is less than n. Various arrangements of chalcogenide glass in position in an infrared athermalizing lens are within the scope of this patent.
Since chalcogenide glass has good achromatism and athermalization performance, but is expensive, the number of chalcogenide glass is preferably 1, and the first lens is preferably the preferred position in the infrared athermalization lens.
Further, the diffraction surface is provided on a mirror surface having an aspherical surface type;
specifically, the number of the diffraction surfaces arranged at the positions in the infrared athermal lens is as follows:
y is the arrangement number of the diffraction surfaces in the infrared athermalization lens, m is the number of the mirror surfaces of the infrared athermalization lens, Y is the number of the diffraction surfaces, and Y is less than m. Various combinations of arrangements of the diffractive surface at the surface position of the infrared athermalized lens are also within the scope of this patent.
Since the diffraction surfaces have good achromatism and athermalization properties but are liable to cause stray light and energy loss, it is preferable that the number of diffraction surfaces is 1 and is located on the front surface of the second lens.
Specifically, the number of the positions of the aspheric surfaces in the infrared athermal lens is as follows:
wherein Z is the number of the positions of the aspheric surfaces in the infrared athermalization lens, and is not less than m. Any surface may be aspheric and various permutations of aspheric surface locations on the lens surface are intended to be within the scope of this patent.
The aspherical surface is excellent in eliminating various aberrations such as spherical aberration, but is expensive to process and complicated in process, and preferably, the number of aspherical surfaces is 4 to 6.
Further, the infrared athermal lens further comprises an aperture diaphragm;
the aperture stop is positioned on the front surface of the second lens or the back surface of the second lens.
The aperture diaphragm is used for limiting imaging light beams and determining the light flux amount, the aperture value and the like, and the larger the aperture diaphragm is, the larger the imaging light beams and the light flux amount are, the smaller the aperture value is.
The position of the aperture stop in the infrared athermalization lens plays a crucial role in correcting various aberrations such as coma.
Furthermore, the focal length f of the infrared athermalization lens ranges from 40mm to 60mm.
Specifically, the focal length of the lens can be changed by simply adjusting the surface type and the curvature radius of the lens surface, and therefore, the focal length of the infrared athermal lens is optimally designed under the optimization constraint condition through optical design software such as zemax.
The larger the focal length value is, the longer the recognition distance of the infrared athermalization lens is, but the volume, weight and cost of the lens are rapidly increased, and the field angle is also reduced.
Further, in the optical design process, the aperture value of the lens can be changed by simply adjusting the aperture diaphragm size and the like, and the range of the aperture value F is as follows: f is more than or equal to 0.8 and less than or equal to 1.3.
Specifically, the smaller the aperture value is, the better the imaging effect of the infrared athermal lens is relatively, but the volume, weight and cost of the lens are also increased rapidly, and preferably, F is selected to be 1.0.
Specifically, the working distance range of the infrared athermalization lens capable of clearly imaging is (30 m, + ∞) according to the focal length f range.
Specifically, according to the chalcogenide glass and the diffraction surface of the lens, the environment temperature of the infrared athermalization lens capable of clearly imaging is (-40 ℃ and +80 ℃).
Specifically, the number of pixels of the detector in the horizontal direction is less than or equal to 4096, and the number of pixels in the vertical direction is less than or equal to 2160; the detector pixel interval a range is as follows: a is more than or equal to 6um and less than or equal to 15um.
Preferably, the detector resolution specification is 4096 × 2160, the pixel spacing is 8um, and the maximum matchable resolution requirement of the actual design is met. The infrared athermal lens can also be compatible with low-resolution detectors such as 1920 x 1080 and 1280 x 1024.
Further, the radius ranges of curvature of the mirror surfaces are respectively as follows: the range of the curvature radius of the front surface of the first lens is [26.831mm,49.829mm ], the range of the curvature radius of the rear surface of the first lens is [ 41.7248mm ], the range of the curvature radius of the front surface of the second lens is [18.046mm,33.514mm ], the range of the curvature radius of the rear surface of the second lens is [14.035mm,26.065mm ], the curvature radius of the front surface and the rear surface of the third lens are negative values, and the range of the curvature radius of the front surface and the range of the curvature radius of the rear surface of the fourth lens are not limited to the positive negative value and the negative value of the curvature radius of the lens.
Further, the thickness ranges of the lenses are as follows: the first lens thickness range is [5.2mm,11.2mm ], the second lens thickness range is [2.5mm,8.5mm ], the third lens thickness range is [2.5mm,8.5mm ], and the fourth lens thickness range is [3.9mm,9.9mm ].
Further, the interval range between the adjacent lenses is as follows: the first lens and the second lens are separated by a distance of [0.1mm,7.15mm ], the second lens and the third lens are separated by a distance of [12.11mm,22.11mm ], the third lens and the fourth lens are separated by a distance of [12.25mm,22.25mm ]; when the device is used, the interval range between the fourth lens and the detector protection window is set to be [8.3mm,18.3mm ].
Preferably, the preferred lens surface type of the infrared athermalization lens is as follows: the front surfaces of the first lens, the third lens and the fourth lens are all spherical surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are all aspheric surfaces, the front surface and the rear surface of the second lens are both aspheric surfaces, and diffraction surfaces are arranged on the aspheric surfaces of the front surfaces.
Preferably, as shown in table 1, the profile of each surface, the radius of curvature R, the thickness of each lens, the spacing between two adjacent lenses, and the material of each lens.
TABLE 1
Wherein, face number 1 and 2 are the front surface and the back surface of first lens respectively, and face number 3 and 4 are the front surface and the back surface of second lens respectively, and face number 5 and 6 are the front surface and the back surface of third lens respectively, and face number 7 and 8 are the front surface and the back surface of fourth lens respectively, and face number 9 and 10 are the front surface and the back surface of detector protection window respectively, and face number 11 is the detector imaging plane.
Further, the aspheric surface type expression is as follows:
wherein Z is the rise of the relative point of the aspheric surface, R is the radius of curvature of the aspheric surface, C 0 K is a conical coefficient, Y is the distance between a point on the aspheric surface and the optical axis, A, B, C and D \8230Mare aspheric surface high-order term coefficients, i is any positive integer, the aspheric surface high-order term coefficients can be set in optical design software, and the high-order term coefficients are optimized.
Specifically, as shown in table 2, the table is a table of various parameters of aspheric surface type:
TABLE 2
| Surface number | Coefficient of cone | Coefficient of fourth order term | Coefficient of six |
| 2 | 0 | -7.4e-07 | 6.5 |
| 3 | 0 | -3.12e-07 | -1.52 |
| 4 | 0 | -3.92e-06 | -2.52 |
| 6 | 0 | -1.434e-08 | -9.82e-10 |
| 8 | 0 | -9.79e-06 | -2.38e-10 |
The second order coefficient, eighth order coefficient and higher order coefficients take the value 0.
Specifically, as shown in table 3, the parameters of the front surface diffraction surface of the second lens are:
TABLE 3
The performance index that can be reached of the optical lens provided by the embodiment is as follows:
focal length: 50mm
Relative pore size: 1.0
The working wavelength is as follows: 8-12 mu m
Field range: 36.3 ° (H) x 19.7 ° (V) x 40.7 ° (D)
Diameter of the image circle: 37mm
Adapting the detector specification: 4096X 2160,8 μm
No thermalization operating temperature range: minus 40 ℃ to plus 80 DEG C
The closest imaging distance: 30m
FIG. 2 shows MTF curves at +20 ℃ for example 1 of the present application; FIG. 3 shows MTF curves at-40 ℃ for example 1 of the present application; FIG. 4 shows MTF curves at +80 ℃ for example 1 of the present application.
Example 2
As shown in fig. 5, the present embodiment 2 is different from the embodiment 1 in the following points:
preferably, the preferred lens surface type of the infrared athermalization lens is as follows: the front surfaces of the first lens, the third lens and the fourth lens are aspheric surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are spherical surfaces, the front surface and the rear surface of the second lens are aspheric surfaces, and a diffraction surface is arranged on the aspheric surface of the rear surface.
Preferably, as shown in table 4, the profile of each surface, the radius of curvature R, the thickness of each lens, the spacing between two adjacent lenses, and the material of each lens.
TABLE 4
Wherein, face number 1 and 2 are the front surface and the back surface of first lens respectively, and face number 3 and 4 are the front surface and the back surface of second lens respectively, and face number 5 and 6 are the front surface and the back surface of third lens respectively, and face number 7 and 8 are the front surface and the back surface of fourth lens respectively, and face number 9 and 10 are the front surface and the back surface of detector protection window respectively, and face number 11 is the detector imaging plane.
Specifically, as shown in table 5, the parameters of the aspheric surface type of the present embodiment are:
TABLE 5
| Surface number | Coefficient of cone | Coefficient of fourth order term | Coefficient of six |
| 1 | 0 | -2.7e-06 | 3.3 |
| 3 | 0 | -6.22e-07 | -9.12 |
| 4 | 0 | -7.7e-06 | -2.02 |
| 6 | 0 | -3.9e-07 | 8.82e-10 |
| 8 | 0 | -1.79e-07 | 1.0e-9 |
The second order coefficient, eighth order coefficient and higher order coefficients take on the value 0.
Specifically, as shown in table 6, the parameters of the rear surface diffraction surface of the second lens in this embodiment are:
TABLE 6
The performance index that can be reached of the optical lens provided by the embodiment is as follows:
focal length: 45mm in diameter
Relative pore size: 0.95
The working wavelength is as follows: 8-12 mu m
Field range: 40 ° (H). Times.21.7 ° (V). Times.44.8 ° (D)
Diameter of the image circle: 37mm
Adapting the detector specification: 4096X 2160,8 μm
No thermalization operating temperature range: minus 40 ℃ to plus 80 DEG C
The closest imaging distance: 30m
Compared with the prior art, the infrared athermalization lens adaptive to the k-resolution assembly has the advantages that the chalcogenide glass and the germanium material are subjected to diamond turning to form the aspheric surface and the diffraction surface, the chalcogenide glass and the diffraction surface have good achromatism and athermalization performance, the infrared athermalization lens can keep image surface consistency and better image contrast without focusing within the range of-40 ℃ to +80 ℃, and the volume and the weight of the infrared athermalization lens are effectively reduced.
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 should be covered by the present invention.
Claims (10)
1. An infrared athermal lens adapted to a 4K resolution assembly, wherein the infrared athermal lens comprises a first lens, a second lens, a third lens and a fourth lens; are respectively arranged once from left to right along the optical axis; the first lens and the fourth lens are convex lenses, and the second lens and the third lens are concave lenses;
at least one of the four lenses is chalcogenide glass;
at least one of the eight mirror surfaces in the four lenses is a diffraction surface and at least one of the eight mirror surfaces is an aspheric surface.
2. The infrared athermalization lens of claim 1, wherein the infrared athermalization lens further comprises an aperture stop;
the aperture stop is positioned on the front surface of the second lens or the back surface of the second lens.
3. The infrared athermalization lens of claim 2 in which the diffractive surface is disposed on a mirror surface having an aspheric surface profile;
the preferred lens surface types of the infrared athermalization lens are as follows: the front surfaces of the first lens, the third lens and the fourth lens are all spherical surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are all aspheric surfaces, the front surface and the rear surface of the second lens are both aspheric surfaces, and diffraction surfaces are arranged on the aspheric surfaces of the front surfaces.
4. The infrared athermalization lens for a 4K resolution package according to claim 2, wherein the preferred lens surface types of the infrared athermalization lens are: the front surfaces of the first lens, the third lens and the fourth lens are aspheric surfaces, the rear surfaces of the first lens, the third lens and the fourth lens are spherical surfaces, the front surface and the rear surface of the second lens are aspheric surfaces, and diffraction surfaces are arranged on the aspheric surfaces of the front surfaces.
5. The infrared athermal lens for adapting a 4K resolution module as recited in claim 4, wherein said aspheric surface type expression is:
wherein Z is the rise of the relative point of the aspheric surface, R is the radius of curvature of the aspheric surface, C 0 K is a conical coefficient, Y is the distance from a point on the aspheric surface to the optical axis, a, B, C, D \8230, M is each aspheric surface high-order term coefficient, and i is any positive integer.
6. The IR athermal lens for an adaptive 4K resolution package of claim 5, wherein the IR athermal lens has a focal length f in the range 40mm ≦ f ≦ 60mm.
7. The IR athermal lens assembly of claim 6, wherein the F range is: f is more than or equal to 0.8 and less than or equal to 1.3.
8. The lens assembly according to claim 7, wherein the ranges of the curvature radii of the mirror surfaces are respectively as follows: the radius of curvature of the front surface of the first lens is [26.831mm,49.829mm ], the radius of curvature of the rear surface of the first lens is [41.72mm,77.48mm ], the radius of curvature of the front surface of the second lens is [18.046mm,33.514mm ], the radius of curvature of the rear surface of the second lens is [14.035mm,26.065mm ], and the radii of curvature of the front surface and the rear surface of the third lens are both negative.
9. The infrared athermalizing lens system according to claim 8, wherein the lens thicknesses are in the range of: the first lens thickness ranges from [5.2mm,11.2mm ], the second lens thickness ranges from [2.5mm,8.5mm ], the third lens thickness ranges from [2.5mm,8.5mm ], and the fourth lens thickness ranges from [3.9mm,9.9mm ].
10. The infrared athermal lens for a 4K resolution module as recited in claim 9, wherein the spacing between adjacent lenses is in a range of: the first and second lenses are spaced apart in the range of [0.1mm,7.15mm ], the second and third lenses are spaced apart in the range of [12.11mm,22.11mm ], and the third and fourth lenses are spaced apart in the range of [12.25mm,22.25mm ].
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| CN202223577962.2U CN218824938U (en) | 2022-12-30 | 2022-12-30 | Infrared athermalization camera lens of adaptation 4K resolution ratio subassembly |
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