Large-area-array wide-view-field long-wave infrared continuous zoom lens

Abstract

The invention discloses a large-area-array wide-view-field long-wave infrared continuous zoom lens. Comprising a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a rear fixed group D with positive focal power and a long-wave uncooled detector which are arranged on the same optical axis from an object side to an image side along the optical axis direction, the effective focal length of the lens is 15-105 mm, the F number of the short focal end is 1.2, the F number of the long focal end is 1.5, the total length of an optical system is 147.36 mm, the resolution ratio of an adaptive detector is 1280 * 1024 pixels, the pixel size is 12 microns, and the effective view field range of the system is 54.3 degrees * 44.55 degrees-8.4 degrees * 6.7 degrees. The function of the invention is to control the zoom group and the compensation group to perform linear motion along the optical axis, change the air space between the lenses and realize continuous zoom adjustment of the system, so that the system has a wider image capture range on the basis of being adaptive to a large-area-array high-resolution detector.

Description

Technical Field

[0001] The patent of this invention belongs to the field of optical technology, and specifically relates to a large-array, wide-field-of-view, long-wave infrared continuous zoom lens. Background Art

[0002] Infrared thermal imaging detection has many advantages, such as non-contact, large-area rapid detection, temperature difference sensitivity, strong environmental adaptability, intuitive images, and good detection performance. It can be widely used in fields such as night reconnaissance, target identification, weapon guidance, and civil fields such as fault detection, key security and reconnaissance, and temperature measurement. Compared with refrigerated infrared thermal imagers, uncooled infrared thermal imagers have more extensive applications in the civil field due to their low power consumption, fast startup, easy use, low cost, and high cost performance.

[0003] Uncooled long-wave infrared lens is the main component of uncooled long-wave infrared thermal imager. Long-wave infrared continuous zoom lens is widely used in uncooled infrared thermal imager because it can ensure the continuity of image during field of view conversion and target tracking. However, the existing uncooled long-wave infrared continuous zoom lens generally has defects such as small zoom ratio, large F number, small field of view, and low resolution of detector. With the rapid development of large-array uncooled infrared movement and related components, infrared detector manufacturers have launched high-resolution infrared detectors with various pixel sizes such as 1024×768, 1280×1024, 1280×1280, etc. At present, the zoom lens industry, especially the long-wave infrared zoom lens industry, is mainly designed based on low pixel resolution infrared detectors. To adapt to long-wave uncooled detectors with a pixel size of 12μm and a resolution of 1280×1024, higher requirements are put forward for the design of zoom lenses.

[0004] For example, Chinese patent CN107991763B discloses a high-definition telephoto long-wave infrared lens with a large zoom ratio, but its resolution is only 20lp / mm, and the imaging effect has room for further improvement. CN117784379A discloses a large-array two-moving-element long-wave non-cooled continuous zoom lens and working method, but its focal length range is 28.5~153mm, and the maximum field of view of the system is 30°×23.3°. The maximum field of view of the system still has the ability to be improved. At the same time, the system length is relatively long, and there is room for further compression of the optical effective length.

[0005] Based on this, technical personnel in this field urgently need to improve the existing uncooled long-wave infrared continuous zoom lens. On the basis of ensuring its optical system imaging capability and high-resolution detection capability, they need to increase the system's maximum optical field of view and compress the axial length of the optical system so that it can have a wider image capture range while adapting to large-array high-resolution detectors to meet social needs.

[0006] Therefore, this paper provides a large array, wide field of view, long-wave infrared continuous zoom lens. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a large-array wide-field-of-view long-wave infrared continuous zoom lens. The device controls the zoom group and the compensation group to move linearly along the optical axis, changes the air gap between the lenses, and realizes continuous zoom adjustment of the system, so that it can have a wider image capture range on the basis of adapting to a large-array high-resolution detector.

[0008] In order to achieve the above technical effects, the present invention is implemented by the following technical solutions: a large-array wide-field long-wave infrared continuous zoom lens, comprising: a front fixed group A with positive optical power, a zoom group B with negative optical power, a compensation group C with positive optical power, a rear fixed group D with positive optical power, and a long-wave uncooled detector arranged along the optical axis from the object side to the image side on the same optical axis. The effective focal length of the lens is 15-105 mm, the F number at the short focal end is 1.2, the F number at the long focal end is 1.5, the total length of the optical system is 147.36 mm, the resolution of the adapted detector is 1280*1024 pixels, the pixel size is 12 μm, and the effective field of view of the system is 54.3°×44.55°~8.4°×6.7°; The positions of the zoom group B and the compensation group C in the direction of the optical axis are adjustable; The front fixed group A is a meniscus lens with positive focal power, the side facing the object side is an aspherical surface, and the side facing the image side is an aspherical surface and a diffraction surface; The zoom group B is a double concave lens with negative focal power, both sides of which are aspherical surfaces, and the total moving stroke of the zoom group B is 63.07 mm; The compensation group C is a biconvex lens with positive focal power, both sides of which are aspherical surfaces, and the total moving stroke of the compensation group C is 7.55 mm; The rear fixed group D is composed of two lenses D-1 and D-2, wherein the first biconcave lens with negative optical power along the optical axis from the object side to the image side is D-1, the side facing the object side is an aspherical surface and a diffraction surface, and the side facing the image side is an aspherical surface; the second meniscus lens with positive optical power is D-2, the side facing the object side is a spherical surface, and the side facing the image side is an aspherical surface.

[0009] Preferably, the lens material of the front fixed group A, the zoom group B, the compensation group C and the D-2 rear fixed group is germanium, and the lens material of the D-1 rear fixed group is chalcogenide glass, and its brand is IRG209.

[0010] Preferably, the distance Z1 between the rear surface of the front fixed group A and the front surface of the magnification group B varies in the range of 5mm~68.07mm, the distance Z2 between the rear surface of the magnification group B and the front surface of the compensation group C varies in the range of 0.3mm~64.2mm, the distance Z3 between the rear surface of the compensation group C and the front surface of the D-1 rear fixed group varies in the range of 0.3mm~7.85mm, the distance between the rear surface of the D-1 rear fixed group and the front surface of the D-2 rear fixed group is 35mm, and the distance between the rear surface of the D-2 rear fixed group and the detector is maintained at 13.20mm.

[0011] Preferably, the distance between the central vertex of the front surface of the front fixed group A and the image plane is controlled to be 147.36 mm in the full zoom state.

[0012] Preferably, the front surface and rear surface of the front fixed group A, the front surface and rear surface of the zoom group B, the front surface and rear surface of the compensation group C, the front surface and rear surface of the D-1 rear fixed group, and the front surface of the D-2 rear fixed group are all even-order aspherical surfaces, and their surface equations are expressed as follows: ; Where c is the radius of curvature, k is the cone coefficient; r is the normalized radius coordinate; a1, a2, a3, a4, a5, a6 are aspherical coefficients.

[0013] Preferably, the coefficients in the front surface profile equation of the front fixing group A are: c=1 / r, r=144.38mm, K=0, a1=0, a2=-3.6588×10 -8 , a3=9.2365×10 -12 , a4=2.6654×10 -15 ; The coefficients in the rear surface profile equation of the front fixing group A are: c=1 / r, r=272.965mm, K=0, a1=0, a2=-1.6635×10 -8 , a3=2.6565×10 -11 , a4=-5.6654×10 -15 , a5=9.8874×10 -20 ; The coefficients in the front surface profile equation of the zoom group B are: c=1 / r, r=-256.224mm, K=0, a1=0, a2=-3.5852×10 -6 , a3=2.3398×10 -9 , a4=-4.6658×10 -12 , a5=1.3256×10 -15 ; The coefficients in the rear surface profile equation of the zoom group B are: c=1 / r, r=137.69mm, K=0, a1=0, a2=-3.6658×10 -6 , a3=7.5755×10 -9 , a4=-1.0245×10 -12 , a5=1.3369×10 -16 ; The coefficients in the front surface profile equation of the compensation group C are: c = 1 / r, r = 132.778 mm, K = 0, a1 = 0, a2 = 5.294 × 10 -8 , a3=6.904×10 -10 , a4=2.203×10 -12 , a5=-3.277×10 -15 ; The coefficients in the rear surface profile equation of the compensation group C are: c = 1 / r, r = -208.111 mm, K = 0, a1 = 0, a2 = -2.152 × 10 -6 , a3=3.1733×10 -9 , a4=-2.2339×10 -12 , a5=1.9853×10 -15 ; The coefficients in the front surface profile equation of the D-1 posterior fixation group are: c=1 / r, r=-1138.379mm, K=0, a1=0, a2=-2.7699×10 -5 , a3=8.6238×10 -9 , a4=-4.8826×10 -13 ; The coefficients in the posterior surface profile equation of the D-1 posterior fixation group are: c=1 / r, r=117.706mm, K=0, a1=0, a2=-1.0100×10 -5 , a3=3.5572×10 -9 , a4=-5.3388×10 -12 ; The coefficients in the front surface profile equation of the D-2 posterior fixation group are: c=1 / r, r=38.201mm, K=0, a1=0, a2=-3.2527×10 -7 , a3=-2.8866×10 -8 , a4=7.20119×10 -11 , a5=-2.6522×10 -13 , a6=1.2826×10 -16 .

[0014] Preferably, the rear surface of the front fixed group A is a binary diffraction surface, and its dispersion characteristic expression is: ; where λ m represents the central wavelength, λ l represents long wave, λ s represents short wave, v represents Abbe number, and λ m =10μm, take λ l =14μm, take λ s =8μm, v=-1.67; Among them, the diffraction surface equation of the front fixed group A is as follows: ; Where c1=-4.45356414549×10 -6 , c2=-7.89463138152255×10 -10 , m=-4, -3, -2, -1, n=4.003.

[0015] The beneficial effects of the present invention are: Compared with the prior art, the present invention proposes a large-array wide-field-of-view long-wave infrared continuous zoom lens composed of a front fixed group, a zoom group, a compensation group and a rear fixed group. While ensuring the adaptability to large-array detectors and optical imaging capabilities, the field of view of the optical system is improved. The effective field of view of the system is 54.3°×44.55°~8.4°×6.7°, which greatly expands the working range of the optical lens in detection imaging and target recognition.

[0016] The present invention adopts multiple even-order aspheric surfaces and binary diffraction surfaces, and uses a combination of germanium materials and chalcogenide materials to greatly compress the axial size of the optical system. The current optical size is 147.36 mm, the whole system is miniaturized, the processability is good, and the optical system has good imaging quality.

[0017] The present invention realizes 7-fold continuous zooming of the optical system focal length from 105 mm to 15 mm by moving a zoom group with negative optical power and a compensation group with positive optical power along the optical axis, has good optical system imaging quality in the whole focal length, and meets the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Those skilled in the art can also obtain other drawings based on these drawings without creative work: Figure 1This is an optical system diagram of the large-array, wide-field-of-view, long-wave infrared continuous zoom lens of the present invention at a focal length of 105 mm; Figure 2 This is an optical system diagram of the large-array, wide-field-of-view, long-wave infrared continuous zoom lens of the present invention at a focal length of 60 mm; Figure 3 This is an optical system diagram of the large-array, wide-field-of-view, long-wave infrared continuous zoom lens of the present invention at a focal length of 15 mm; Figure 4 This is the MTF curve of the present invention at a focal length of 105mm and a spatial frequency of 42lp / mm; Figure 5 This is the MTF curve diagram of the present invention at a focal length of 60mm and a spatial frequency of 42lp / mm; Figure 6 This is the MTF curve of the present invention at a focal length of 15 mm and a spatial frequency of 42 lp / mm; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Front fixed group A; 2. Zoom group B; 3. Compensation group C; 4. Rear fixed group D; 5. D-1 rear fixed group; 6. D-2 rear fixed group. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0020] The inventors found that in the prior art, such as the Chinese patent (CN107991763B) disclosed a high-definition long-focal-length long-wave infrared lens, but its resolution capability is only 20lp / mm, and the imaging effect has room for further improvement. CN117784379A provides a large-array two-moving-element long-wave uncooled continuous zoom lens and a working method, but its focal length range is 28.5~153mm, and the maximum field of view of the system is 30°×23.3°. The maximum field of view of the system can still be improved. At the same time, the system length is relatively long, and there is room for further compression of the optical effective length. like Figure 1 , Figure 2 and Figure 3The optical system diagram of the large-array wide-field long-wave infrared continuous zoom lens shown in FIG. 1 is at 105 mm, 60 mm, and 15 mm. The present invention provides a large-array wide-field long-wave infrared continuous zoom lens, which is composed of a front fixed group A1, a zoom group B2, a compensation group C3, a rear fixed group D4, and a detector, which are sequentially distributed along the optical axis from the object side to the image side. The front fixed group A1 is composed of a positive optical focal length meniscus lens A with a convex surface facing the object side, the zoom group B2 is composed of a double concave lens B with a negative optical focal length, the compensation group C3 is composed of a double convex lens C with a positive optical focal length, and the rear fixed group D4 is composed of a double concave lens D-1 with a negative optical focal length and a meniscus lens D-2 with a positive optical focal length and a convex surface facing the object side, which are sequentially distributed along the optical axis.

[0021] Specifically, in the embodiment of the present invention, the effective focal length of the large-array wide-field-of-view long-wave infrared continuous zoom lens is 15-105 mm, the F number at the short focal end is 1.2, the F number at the long focal end is 1.5, the total length of the optical system is 147.36 mm, the resolution of the adapted detector is 1280*1024 pixels, the pixel size is 12 μm, and the effective field of view of the system ranges from 54.3°×44.55° to 8.4°×6.7°.

[0022] The zoom group and the compensation group of the present invention can perform reciprocating linear motion along the optical axis. During the zooming process, the zoom group performs monotonous linear motion along the optical axis, and the compensation group performs reciprocating linear motion along the optical axis. The positions of the front fixed group and the rear fixed group on the optical axis remain unchanged during the zooming process.

[0023] In the embodiment of the present invention, the lens material of the front fixed group A1, the variable power group B2, the compensation group C3 and the D-2 rear fixed group 6 is germanium, and the lens material of the D-1 rear fixed group 5 is chalcogenide glass, and its brand is IRG209.

[0024] The large-array wide-field-of-view long-wave infrared continuous zoom lens of the present invention comprises aspherical surfaces of the front and rear surfaces of the front fixed group A1, the front and rear surfaces of the zoom group B2, the front and rear surfaces of the compensation group C3, the front and rear surfaces of the D-1 rear fixed group 5, and the front surface of the D-2 rear fixed group 6.

[0025] Specifically, the front surface of the front fixed group A1 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 144.38 mm, K = 0, a1 = 0, a2 = -3.6588 × 10 -8 , a3=9.2365×10 -12 , a4=2.6654×10 -15 .

[0026] The rear surface of the front fixed group A1 of the present invention is an even-order aspheric surface and a diffractive surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 272.965 mm, K = 0, a1 = 0, a2 = -1.6635 × 10 -8 , a3=2.6565×10 -11 , a4=-5.6654×10 -15 , a5=9.8874×10 -20 , The surface equation of its diffraction surface is as follows: ; Where c1=-4.45356414549×10 -6 , c2=-7.89463138152255×10 -10 , m=-4, -3, -2, -1, n=4.003.

[0027] The front surface of the zoom group B2 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = -256.224 mm, K = 0, a1 = 0, a2 = -3.5852 × 10 -6 , a3=2.3398×10 -9 , a4=-4.6658×10 -12 , a5=1.3256×10 -15 .

[0028] The rear surface of the zoom group B2 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 137.69 mm, K = 0, a1 = 0, a2 = -3.6658 × 10 -6 , a3=7.5755×10 -9 , a4=-1.0245×10 -12 , a5=1.3369×10 -16 .

[0029] The front surface of the compensation group C3 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 132.778 mm, K = 0, a1 = 0, a2 = 5.294 × 10 -8, a3=6.904×10 -10 , a4=2.203×10 -12 , a5=-3.277×10 -15 .

[0030] The rear surface of the compensation group C3 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c=1 / r, r=-208.111mm, K=0, a1=0, a2=-2.152×10-6, a3=3.1733×10-9, a4=-2.2339×10-12, a5=1.9853×10-15.

[0031] The front surface of the D-1 rear fixing group 5 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = -1138.379 mm, K = 0, a1 = 0, a2 = -2.7699 × 10 -5 , a3=8.6238×10 -9 , a4=-4.8826×10 -13 .

[0032] The rear surface of the D-1 rear fixing group 5 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 117.706 mm, K = 0, a1 = 0, a2 = -1.0100 × 10 -5 , a3=3.5572×10 -9 , a4=-5.3388×10 -12 .

[0033] The front surface of the D-2 rear fixing group 6 of the present invention is an even-order aspheric surface, and the surface equation of the aspheric surface is as follows: ; Where c = 1 / r, r = 38.201 mm, K = 0, a1 = 0, a2 = -3.2527 × 10 -7 , a3=-2.8866×10 -8 , a4=7.20119×10 -11 , a5=-2.6522×10 -13 , a6=1.2826×10 -16 .

[0034] The focal length range of the large array wide field long-wave infrared continuous zoom lens of the present invention is 15mm~105mm, the distance between the rear surface of the front fixed group A1 and the front surface of the variable magnification group B2 is Z1, the distance between the rear surface of the variable magnification group B2 and the front surface of the compensation group C3 is Z2, and the distance between the rear surface of the compensation group C3 and the front surface of the D-1 rear fixed group 5 is Z3. When the focal length of the long-wave infrared lens changes within the range of 15mm~105mm, Z1 increases from 5mm to 68.07mm, Z2 decreases from 64.2mm to 0.3mm, Z3 increases from 0.3mm to 7.85mm and then gradually decreases to 0.3mm, the distance between the rear surface of the D-1 rear fixed group 5 and the front surface of the D-2 rear fixed group 6 is 35mm, and the distance between the rear surface of the D-2 rear fixed group 6 and the detector is maintained at 13.20mm.

[0035] In the present invention, the distance from the central vertex of the front surface of the front fixing group A1 to the image plane is controlled to be 147.36 mm in the full zoom state. Example 2

[0036] In the present invention, the surfaces of each lens group are marked along the optical axis from the object side to the image side. The front and rear surfaces of the front fixed group A1 are marked as S1 and S2, the front and rear surfaces of the zoom group B2 are marked as S3 and S4, the front and rear surfaces of the compensation group C3 are marked as S5 and S6, the front and rear surfaces of the D-1 rear fixed group 5 are marked as S7 and S8, and the front and rear surfaces of the D-2 rear fixed group 6 are marked as S9 and S10. During the zooming process of the lens of the present invention, the distance between the rear surface of the front fixed group A1 and the front surface of the zoom group B2 is Z1, the distance between the rear surface of the zoom group B2 and the front surface of the compensation group C3 is Z2, and the distance between the rear surface of the compensation group C3 and the front surface of the D-1 rear fixed group 5 is Z3. The optical structural parameters of the present invention at focal lengths of 105mm, 60mm, and 15mm are shown in Table 1: ; In Table 1, 10mm, 3mm, 5.5mm, 7mm, and 4.2mm correspond to the center thickness of the lens of the front fixed group A1, the zoom group B2, the compensation group C3, the D-1 rear fixed group 5, and the D-2 rear fixed group 6, respectively. The center thickness of the lens remains unchanged during the continuous zooming process. The distance between the rear surface of the front fixed group A and the front surface of the zoom group B is Z1, the distance between the rear surface of the zoom group B and the front surface of the compensation group C3 is Z2, and the distance between the rear surface of the compensation group C3 and the front surface of the D-1 rear fixed group 5 is Z3, which continuously changes during the continuous zooming process. The air gap between the rear surface of the D-1 rear fixed group 5 and the front surface of the D-2 rear fixed group 6 is 35mm, and the distance between the rear surface of the D-2 rear fixed group 6 and the image plane is 13.20mm. The above two parameters remain unchanged during the zooming process.

[0037] During the continuous zooming process, the values ​​of Z1, Z2, and Z3 at different focal lengths are shown in Table 2: ; In the continuous zooming process of the present invention, as the system focal length gradually changes from 105mm to 15mm, Z1 will undergo a monotonous linear change, gradually decreasing from 68.07mm to 5mm, Z2 will undergo a monotonous linear change, gradually increasing from 0.3mm to 64.2mm, and Z3 will undergo a reciprocating change, increasing from 0.3mm to 7.85mm and then decreasing to 0.3mm.

[0038] Figure 4 , Figure 5 , Figure 6 They are respectively optical transfer function (MTF) curves of the present invention at a spatial frequency of 42lp / mm when the focal lengths are long focus (105mm), medium focus (60mm), and short focus (15mm), wherein the horizontal axis is the number of line pairs per millimeter and the vertical axis is the normalized contrast. It can be seen from the figure that at different focal lengths, the modulation transfer function value of the present invention is high, indicating that clear imaging of the target can be achieved throughout the continuous zoom process.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A large array wide field of view long-wave infrared continuous zoom lens, comprising: A front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a rear fixed group D with positive focal power, and a long-wave uncooled detector are arranged along the optical axis from the object side to the image side on the same optical axis; characterized in that: the effective focal length of the lens is 15~105mm, the F number at the short focal end is 1.2, the F number at the long focal end is 1.5, the total length of the optical system is 147.36mm, the resolution of the adapted detector is 1280*1024 pixels, the pixel size is 12μm, and the effective field of view of the system is 54.3°×44.55°~8.4°×6.7°; The positions of the zoom group B and the compensation group C in the direction of the optical axis are adjustable; The front fixed group A is a meniscus lens with positive focal power, the side facing the object side is an aspherical surface, and the side facing the image side is an aspherical surface and a diffraction surface; The zoom group B is a double concave lens with negative focal power, both sides of which are aspherical surfaces, and the total moving stroke of the zoom group B is 63.07 mm; The compensation group C is a biconvex lens with positive focal power, both sides of which are aspherical surfaces, and the total moving stroke of the compensation group C is 7.55 mm; The rear fixed group D is composed of two lenses D-1 and D-2, wherein the first biconcave lens with negative optical power along the optical axis from the object side to the image side is D-1, the side facing the object side is an aspherical surface and a diffraction surface, and the side facing the image side is an aspherical surface; the second meniscus lens with positive optical power is D-2, the side facing the object side is a spherical surface, and the side facing the image side is an aspherical surface.

2. The large-array wide-field long-wave infrared continuous zoom lens according to claim 1, characterized in that: The lens materials of the front fixed group A, the variable power group B, the compensation group C and the D-2 rear fixed group are germanium, and the lens material of the D-1 rear fixed group is chalcogenide glass.

3. The large-array wide-field long-wave infrared continuous zoom lens according to claim 1, characterized in that: The distance Z1 between the rear surface of the front fixed group A and the front surface of the zoom group B varies in the range of 5mm~68.07mm, the distance Z2 between the rear surface of the zoom group B and the front surface of the compensation group C varies in the range of 0.3mm~64.2mm, the distance Z3 between the rear surface of the compensation group C and the front surface of the D-1 rear fixed group varies in the range of 0.3mm~7.85mm, the distance between the rear surface of the D-1 rear fixed group and the front surface of the D-2 rear fixed group is 35mm, and the distance between the rear surface of the D-2 rear fixed group and the detector is maintained at 13.20mm.

4. The large-array wide-field long-wave infrared continuous zoom lens according to claim 1, characterized in that: The distance between the central vertex of the front surface of the front fixed group A and the image plane is controlled to be 147.36 mm in the full zoom state.

5. The large-array wide-field long-wave infrared continuous zoom lens according to claim 1, characterized in that: The front and rear surfaces of the front fixed group A, the front and rear surfaces of the zoom group B, the front and rear surfaces of the compensation group C, the front and rear surfaces of the D-1 rear fixed group, and the front surface of the D-2 rear fixed group are all even-order aspherical surfaces, and their surface equations are expressed as follows: ； Where c is the radius of curvature, k is the cone coefficient; r is the normalized radius coordinate; a1, a2, a3, a4, a5, a6 are aspherical coefficients.

6. The large-array wide-field long-wave infrared continuous zoom lens according to claim 3, characterized in that: The coefficients in the front surface profile equation of the front fixing group A are: c=1 / r, r=144.38mm, K=0, a1=0, a2=-3.6588×10 -8 , a3=9.2365×10 -12 , a4=2.6654×10 -15 ; The coefficients in the rear surface profile equation of the front fixing group A are: c=1 / r, r=272.965mm, K=0, a1=0, a2=-1.6635×10 -8 , a3=2.6565×10 -11 , a4=-5.6654×10 -15 , a5=9.8874×10 -20 ; The coefficients in the front surface profile equation of the zoom group B are: c=1 / r, r=-256.224mm, K=0, a1=0, a2=-3.5852×10 -6 , a3=2.3398×10 -9 , a4=-4.6658×10 -12 , a5=1.3256×10 -15 ; The coefficients in the rear surface profile equation of the zoom group B are: c=1 / r, r=137.69mm, K=0, a1=0, a2=-3.6658×10 -6 , a3=7.5755×10 -9 , a4=-1.0245×10 -12 , a5=1.3369×10 -16 ; The coefficients in the front surface profile equation of the compensation group C are: c = 1 / r, r = 132.778 mm, K = 0, a1 = 0, a2 = 5.294 × 10 -8 , a3=6.904×10 -10 , a4=2.203×10 -12 , a5=-3.277×10 -15 ; The coefficients in the rear surface profile equation of the compensation group C are: c = 1 / r, r = -208.111 mm, K = 0, a1 = 0, a2 = -2.152 × 10 -6 , a3=3.1733×10 -9 , a4=-2.2339×10 -12 , a5=1.9853×10 -15 ; The coefficients in the front surface profile equation of the D-1 posterior fixation group are: c=1 / r, r=-1138.379mm, K=0, a1=0, a2=-2.7699×10 -5 , a3=8.6238×10 -9 , a4=-4.8826×10 -13 ; The coefficients in the posterior surface profile equation of the D-1 posterior fixation group are: c=1 / r, r=117.706mm, K=0, a1=0, a2=-1.0100×10 -5 , a3=3.5572×10 -9 , a4=-5.3388×10 -12 ; The coefficients in the front surface profile equation of the D-2 posterior fixation group are: c=1 / r, r=38.201mm, K=0, a1=0, a2=-3.2527×10 -7 , a3=-2.8866×10 -8 , a4=7.20119×10 -11 , a5=-2.6522×10 -13 , a6=1.2826×10 -16 .

7. The large-array wide-field long-wave infrared continuous zoom lens according to claim 1, characterized in that: The rear surface of the front fixed group A is a binary diffraction surface, and its dispersion characteristic expression is: ； where λ m represents the central wavelength, λ l represents long wave, λ s represents short wave, v represents Abbe number, and λ m =10μm, take λ l =14μm, take λ s =8μm, v=-1.67; Among them, the diffraction surface equation of the front fixed group A is as follows: ； Where c1=-4.45356414549×10 -6 , c2=-7.89463138152255×10 -10 , m=-4, -3, -2, -1, n=4.003.

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