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

Abstract

The utility model 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. According to the utility model, by controlling the zoom group and the compensation group to carry out linear motion along the optical axis, the air space between the lenses is changed, and the continuous zoom adjustment of the system is realized, 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 utility model discloses belong to optical technology field, specifically related to a big area array wide field of view long wave infrared continuous zoom lens. BACKGROUND

[0002] Infrared thermal imaging detection can be widely applied to military fields such as night reconnaissance, target identification and weapon guidance and civil fields such as fault detection, important place security and reconnaissance and temperature measurement due to its advantages of non-contact, large-area rapid detection, temperature difference sensitivity, strong environmental adaptability, intuitive image and good detection performance.

[0003] The non-cooled long-wave infrared lens is the main component of the non-cooled long-wave infrared thermal imager, and the long-wave infrared continuous zoom lens is widely used in the non-cooled infrared thermal imager because it can ensure the continuity of the image during field conversion and target tracking. However, the existing non-cooled 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 matched detector.

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

[0005] Therefore, there is an urgent need in the art to improve the existing non-cooled long-wave infrared continuous zoom lens to improve the maximum optical field of view of the system, compress the axial length of the optical system, and make it have a wider image capture range on the basis of adapting to large-area high-resolution detectors, so as to meet the social needs.

[0006] Therefore, provided herein is a large-array wide-field long-wave infrared continuous zoom lens. Inventive content

[0007] In order to solve the above technical problems, the utility model provides a kind of large-array wide-field long-wave infrared continuous zoom lens, the device is moved in straight line along optical axis by controlling variable magnification group and compensation group, changes air interval between lens, realizes system continuous zoom adjustment, so that it can be based on the adaptation large-array high-resolution detector, with wider image capture range.

[0008] In order to achieve the above technical effects, the utility model realizes by following technical scheme: a kind of large-array wide-field long-wave infrared continuous zoom lens, comprising: by object side to image side on the same optical axis along the direction of optical axis and being provided with the front fixed group A with positive focal power, variable magnification group B with negative focal power, compensation group C with positive focal power, rear fixed group D with positive focal power and long-wave uncooled detector,

[0009] The effective focal length of the lens is 15~105mm, the short-focus end F number is 1.2, the long-focus end F number is 1.5, the total length of 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 range of the system is 54.3°×44.55°~8.4°×6.7°;

[0010] The positions of the variable magnification group B and the compensation group C in the direction of the optical axis are adjustable;

[0011] The front fixed group A is a positive focal power meniscus lens, the side towards the object side is aspherical, and the side towards the image side is aspherical and diffractive;

[0012] The variable magnification group B is a negative focal power double-concave lens, both sides of which are aspherical, and the total moving stroke of the variable magnification group B is 63.07mm;

[0013] The compensation group C is a positive focal power double-convex lens, both sides of which are aspherical, and the total moving stroke of the compensation group C is 7.55mm;

[0014] The rear fixed group D is composed of two lenses D-1 and D-2, wherein the first piece of negative focal power double-concave lens from the object side to the image side along the optical axis is D-1, the side towards the object side is aspherical and diffractive, and the side towards the image side is aspherical;The second piece of positive focal power meniscus lens is D-2, the side towards the object side is spherical, and the side towards the image side is aspherical.

[0015] As a preferred, 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 with a brand of IRG209.

[0016] As a preferred, the distance Z1 between the rear surface of the front fixed group A and the front surface of the zoom group B ranges from 5mm to 68.07mm, the distance Z2 between the rear surface of the zoom group B and the front surface of the compensation group C ranges from 0.3mm to 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 ranges from 0.3mm to 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 kept as 13.20mm.

[0017] As a preferred, the distance between the front surface center vertex of the front fixed group A and the image surface is controlled as 147.36mm in the full zoom state.

[0018] As a preferred, the front surface and the rear surface of the front fixed group A, the front surface and the rear surface of the zoom group B, the front surface and the rear surface of the compensation group C, the front surface and the rear surface of the D-1 rear fixed group, and the front surface of the D-2 rear fixed group are even aspheric surfaces, and the surface equation expression thereof is as follows:

[0019] ;

[0020] Wherein c is the radius of curvature, k is the conic coefficient, r is the normalized radius coordinate, and a1, a2, a3, a4, a5, a6 are aspheric coefficients.

[0021] As a preferred, the coefficients in the surface equation of the front surface of the front fixed group A are as follows: c=1 / r, r=144.38mm, K=0, a1=0, a2=-3.6588×10-4, a3=9.2365×10-5, a4=2.6654×10-6, a5=0, and a6=0. -8 -12 -15 ;

[0022] The coefficients in the surface equation of the rear surface of the front fixed group A are as follows: c=1 / r, r=272.965mm, K=0, a1=0, a2=-1.6635×10-4, a3=2.6565×10-5, a4=-5.6654×10-6, a5=9.8874×10-7, and a6=0. -8 -11 -15 -20 ;

[0023] ​​​​​The coefficients in the front surface surface type equation of the variable magnification group B are respectively: c=1 / r, r=-256.224mm, K=0, a1=0, a2=-3.5852x10 -6 , a3=2.3398x10 -9 , a4=-4.6658x10 -12 , a5=1.3256x10 -15 ;

[0024] The coefficients in the rear surface surface type equation of the variable magnification group B are respectively: c=1 / r, r=137.69mm, K=0, a1=0, a2=-3.6658x10 -6 , a3=7.5755x10 -9 , a4=-1.0245x10 -12 , a5=1.3369x10 -16 ;

[0025] The coefficients in the front surface surface type equation of the compensation group C are respectively: c=1 / r, r=132.778mm, K=0, a1=0, a2=5.294x10 -8 , a3=6.904x10 -10 , a4=2.203x10 -12 , a5=-3.277x10 -15 ;

[0026] The coefficients in the rear surface surface type equation of the compensation group C are respectively: c=1 / r, r=-208.111mm, K=0, a1=0, a2=-2.152x10 -6 , a3=3.1733x10 -9 , a4=-2.2339x10 -12 , a5=1.9853x10 -15 ;

[0027] The coefficients in the front surface surface type equation of the D-1 rear fixed group are respectively: c=1 / r, r=-1138.379mm, K=0, a1=0, a2=-2.7699x10 -5 , a3=8.6238x10 -9 , a4=-4.8826x10 -13 ;

[0028] The coefficients in the rear surface surface type equation of the D-1 rear fixed group are respectively: c=1 / r, r=117.706mm, K=0, a1=0, a2=-1.0100x10 -5 , a3=3.5572x10 -9a4=-5.3388x10 -12 ;

[0029] The coefficients in the front surface profile equation of the D-2 rear fixed group are respectively: c=1 / r, r=38.201mm, K=0, a1=0, a2=-3.2527x10 -7 , a3=-2.8866x10 -8 , a4=7.20119x10 -11 , a5=-2.6522x10 -13 , a6=1.2826x10 -16 .

[0030] Preferably, the rear surface of the front fixed group A is a binary diffraction surface, and the dispersion characteristic expression thereof is:

[0031] ;

[0032] Wherein, λ m represents a center wavelength, λ l represents a long wave, λ s represents a short wave, and v represents an Abbe number, λ m =10μm, λ l =14μm, λ s =8μm, and v=-1.67.

[0033] Wherein, the diffraction surface profile equation of the front fixed group A is as follows:

[0034] ;

[0035] Wherein, c1=-4.45356414549x10 -6 , c2=-7.89463138152255x10 -10 , m=-4, -3, -2, -1, and n=4.003.

[0036] The utility model discloses the beneficial effects are:

[0037] Compared with the prior art, the utility model discloses a large area array wide field of view long wave infrared continuous zoom lens consisting of a front fixed group, a zoom group, a compensation group and a rear fixed group, on the basis of guaranteeing that large area array detector and optical imaging ability can be adapted, the field of view range of optical system is promoted, and the effective field of view range of the system is 54.3°x44.55°~8.4°x6.7°, and the working range of the optical lens in detection imaging and target identification is greatly widened.

[0038] The utility model discloses adopt multiple pieces of even times aspheric surface and binary diffraction surface, and adopt the mode of germanium material and chalcogen material collocation, greatly compress the axial dimension of optical system, and the optical size of existing is 147.36mm, and the whole machine system miniaturization is good in process, and has good optical system imaging quality.

[0039] The utility model discloses the zoom group of having negative light focus and the compensation group of positive light focus are moved along the optical axis and realize the 7 times continuous zoom of optical system focal length from 105mm~15mm, and all have good optical system imaging quality in full focus section, satisfy the use requirement. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduce, and the person skilled in the art can also obtain other drawings according to these drawings without paying the creative labor:

[0041] Figure 1 For the optical system diagram of the utility model large area array wide field of view long wave infrared continuous zoom lens at the focal length of 105mm;

[0042] Figure 2 For the optical system diagram of the utility model large area array wide field of view long wave infrared continuous zoom lens at the focal length of 60mm;

[0043] Figure 3 For the optical system diagram of the utility model large area array wide field of view long wave infrared continuous zoom lens at the focal length of 15mm;

[0044] Figure 4 For the MTF curve diagram of the utility model at the focal length of 105mm, and the spatial frequency is 42lp / mm;

[0045] Figure 5 For the MTF curve diagram of the utility model at the focal length of 60mm, and the spatial frequency is 42lp / mm;

[0046] Figure 6 For the MTF curve diagram of the utility model at the focal length of 15mm, and the spatial frequency is 42lp / mm;

[0047] In the drawing, the component list represented by each sign is as follows:

[0048] 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

[0049] The technical solutions in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. Embodiment 1

[0050] The inventor found that in the prior art, such as a high-definition long-focus long-wave infrared lens disclosed in Chinese patent (CN107991763B), but its resolution capability is only 20 lp / mm, and the imaging effect has further space for improvement. CN117784379A provides a large-array two-motion-group-element long-wave non-cooled continuous zoom lens and working method, but its focal length range is 28.5~153mm, the system maximum field of view range is 30°x23.3°, and the system maximum field of view range still has the ability to be improved, and at the same time, the system length is relatively long, and there is space for further compression of the optical effective length;

[0051] As shown in Figure 1 , Figure 2 and Figure 3 , the optical system diagram of the large-array wide-field long-wave infrared continuous zoom lens at 105mm, 60mm and 15mm, the utility model provides a kind of large-array wide-field long-wave infrared continuous zoom lens, which is sequentially distributed from object side to image side along optical axis and is composed of front fixed group A1, zoom group B2, compensation group C3, rear fixed group D4 and detector, front fixed group A1 is composed of positive focal length meniscus lens A with convex surface towards object side, zoom group B2 is composed of double-concave lens B with negative focal length, compensation group C3 is composed of double-convex lens C with positive focal length, and rear fixed group D4 is composed of double-concave lens D-1 with negative focal length and meniscus lens D-2 with positive focal length, which is sequentially distributed along optical axis direction and has convex surface towards object side.

[0052] Specifically, in the embodiment of the utility model, the effective focal length of the large-array wide-field long-wave infrared continuous zoom lens is 15~105mm, the short-focus end F number is 1.2, the long-focus end F number is 1.5, the total length of optical system is 147.36mm, the adaptive probe resolution is 1280*1024 pixels, the pixel size is 12μm, and the system effective field of view range is 54.3°x44.55°~8.4°x6.7°.

[0053] The zoom group and the compensation group can move linearly along the optical axis, and during zooming, the zoom group moves linearly along the optical axis, and the compensation group moves linearly along the optical axis, and the positions of the front fixed group and the rear fixed group on the optical axis remain unchanged during zooming.

[0054] The lens material of the front fixed group A1, the zooming group B2, the compensation group C3 and the D-2 rear fixed group 6 in the embodiment of the utility model is germanium, the lens material of the D-1 rear fixed group 5 is chalcogenide glass, and the model number thereof is IRG209.

[0055] The front surface and the rear surface of the front fixed group A1, the front surface and the rear surface of the zooming group B2, the front surface and the rear surface of the compensation group C3, the front surface and the rear surface of the D-1 rear fixed group 5 and the front surface of the D-2 rear fixed group 6 are aspherical surfaces.

[0056] Specifically, the front surface of the front fixed group A1 is an even aspherical surface, and the surface equation of the aspherical surface is as follows:

[0057] ;

[0058] Wherein c = 1 / r, r = 144.38mm, K = 0, a1 = 0, a2 = -3.6588x10 -8 , a3 = 9.2365x10 -12 , a4 = 2.6654x10 -15 .

[0059] The rear surface of the front fixed group A1 is an even aspherical surface and a diffraction surface, and the surface equation of the aspherical surface is as follows:

[0060] ;

[0061] Wherein c = 1 / r, r = 272.965mm, K = 0, a1 = 0, a2 = -1.6635x10 -8 , a3 = 2.6565x10 -11 , a4 = -5.6654x10 -15 , a5 = 9.8874x10 -20 ,

[0062] The surface equation of the diffraction surface is as follows:

[0063] ;

[0064] Wherein, c1 = -4.45356414549x10 -6 , c2 = -7.89463138152255x10 -10 , m = -4, -3, -2, -1, and n = 4.003.

[0065] The front surface of the zooming group B2 is an even aspherical surface, and the surface equation of the aspherical surface is as follows:

[0066] ;

[0067] wherein c=1 / r, r=-256.224mm, K=0, a1=0, a2=-3.5852x10-6, a3=2.3398x10-9, a4=-4.6658x10-12, a5=1.3256x10-15. -6 -9 -12 -15 .

[0068] The rear surface of the zoom group B2 is an even aspheric surface, and the surface equation of the aspheric surface is as follows:

[0069] ;

[0070] wherein c=1 / r, r=137.69mm, K=0, a1=0, a2=-3.6658x10-6, a3=7.5755x10-9, a4=-1.0245x10-12, a5=1.3369x10-15. -6 -9 -12 -16 .

[0071] The front surface of the compensation group C3 is an even aspheric surface, and the surface equation of the aspheric surface is as follows:

[0072] ;

[0073] wherein c=1 / r, r=132.778mm, K=0, a1=0, a2=5.294x10-6, a3=6.904x10-9, a4=2.203x10-12, a5=-3.277x10-15. -8 -10 -12 -15 .

[0074] The rear surface of the compensation group C3 is an even aspheric surface, and the surface equation of the aspheric surface is as follows:

[0075] ;

[0076] wherein c=1 / r, r=-208.111mm, K=0, a1=0, a2=-2.152x10-6, a3=3.1733x10-9, a4=-2.2339x10-12, a5=1.9853x10-15.

[0077] The front surface of the D-1 rear fixed group 5 is an even aspheric surface, and the surface equation of the aspheric surface is as follows:

[0078] ​​​​​​​​​ ;

[0079] wherein c=1 / r, r=-1138.379mm, K=0, a1=0, a2=-2.7699x10 -5 , a3=8.6238x10 -9 , a4=-4.8826x10 -13 .

[0080] The rear surface of the D-1 rear fixed group 5 is an even aspheric surface, and the aspheric surface has the following surface equation:

[0081] ;

[0082] wherein c=1 / r, r=117.706mm, K=0, a1=0, a2=-1.0100x10 -5 , a3=3.5572x10 -9 , a4=-5.3388x10 -12 .

[0083] The front surface of the D-2 rear fixed group 6 is an even aspheric surface, and the aspheric surface has the following surface equation:

[0084] ;

[0085] wherein c=1 / r, r=38.201mm, K=0, a1=0, a2=-3.2527x10 -7 , a3=-2.8866x10 -8 , a4=7.20119x10 -11 , a5=-2.6522x10 -13 , a6=1.2826x10 -16 .

[0086] The focal length range of the large-array wide-view field long-wave infrared continuous zoom lens is 15mm~105mm, the distance between the rear surface of the front fixed group A1 and the front surface of the variable group B2 is Z1, the distance between the rear surface of the variable 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 in 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 kept at 13.20mm.

[0087] The distance from the front surface center vertex of the front fixed group A1 to the image surface is controlled to be 147.36mm in the full zoom state. Embodiment 2

[0088] In the utility model, the surfaces of each lens group are marked along the optical axis direction from the object side to the image side, and the front and rear surfaces of the front fixed group A1 are S1 and S2 in turn, the front and rear surfaces of the variable magnification group B2 are S3 and S4 in turn, the front and rear surfaces of the compensation group C3 are S5 and S6 in turn, the front and rear surfaces of the D-1 rear fixed group 5 are S7 and S8 in turn, and the front and rear surfaces of the D-2 rear fixed group 6 are S9 and S10 in turn. In the zoom process of the lens of the utility model, 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. The optical structure parameters when the focal length is 105mm, 60mm and 15mm are shown in Table 1.

[0089]

[0090] In Table 1, 10mm, 3mm, 5.5mm, 7mm and 4.2mm correspond to the center thicknesses of the lenses of the front fixed group A1, the variable magnification group B2, the compensation group C3, the D-1 rear fixed group 5 and the D-2 rear fixed group 6 in turn, and the center thicknesses of the lenses remain unchanged in the continuous zoom process. 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, which continuously changes in the continuous zoom 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 surface is 13.20mm, and the above two parameters remain unchanged in the zoom process.

[0091] In the continuous zoom process, the values of Z1, Z2 and Z3 at different focal lengths are shown in Table 2.

[0092]

[0093] In the continuous zoom process, with the gradual change of the system focal length from 105mm to 15mm, Z1 will monotonously and linearly change, gradually reducing from 68.07mm to 5mm, Z2 will monotonously and linearly change, gradually increasing from 0.3mm to 64.2mm, and Z3 will reciprocally change, increasing from 0.3mm to 7.85mm and then reducing to 0.3mm. ​

[0094] Figure 4 、 Figure 5 、 Figure 6 Fig. 1, 2 and 3 are optical transfer function (MTF) curve graphs of the utility model at focal length of long focus (105mm), medium focus (60mm) and short focus (15mm) respectively, wherein the abscissa is the logarithm of line per millimeter, the ordinate is the normalized contrast, from the graph, it can be seen that the modulation transfer function value of the utility model is high at different focal lengths, which indicates that clear imaging of the target can be realized in the whole process of continuous zooming.

[0095] It is obvious for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0096] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which 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 length, a variable group B with negative focal length, a compensation group C with positive focal length, a rear fixed group D with positive focal length and a long-wave uncooled detector are arranged on the same optical axis from the object side to the image side in the direction of the optical axis; characterized in that the effective focal length of the lens is 15-105 mm, the short-focus end F number is 1.2, the long-focus end F number is 1.5, the total length of the optical system is 147.36 mm, the adapted detector resolution is 1280*1024 pixels, the image element size is 12 μm, and the system effective field of view ranges from 54.3°*44.55° to 8.4°*6.7°; The positions of the variable group B and the compensation group C in the direction of the optical axis are adjustable; The front fixed group A is a positive focal length meniscus lens, the side towards the object is aspheric, and the side towards the image is aspheric and diffractive; The variable group B is a double-concave lens with negative focal length, both sides are aspheric, and the total moving stroke of the variable group B is 63.07 mm; The compensation group C is a double-convex lens with positive focal length, both sides are aspheric, 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 piece of double-concave lens with negative focal length from the object side to the image side along the optical axis is D-1, the side towards the object is aspheric and diffractive, and the side towards the image is aspheric; the second piece of positive focal length meniscus lens is D-2, the side towards the object is spherical, and the side towards the image is aspheric.

2. The large format wide field of view long wave infrared continuous zoom lens of claim 1, wherein: The lens materials of the front fixed group A, the variable group B, the compensation group C and the rear fixed group D-2 are germanium, and the lens material of the rear fixed group D-1 is chalcogenide glass.

3. The large format wide field of view long wave infrared continuous zoom lens of claim 1, wherein: The distance Z1 between the rear surface of the front fixed group A and the front surface of the variable group B ranges from 5 mm to 68.07 mm, the distance Z2 between the rear surface of the variable group B and the front surface of the compensation group C ranges from 0.3 mm to 64.2 mm, the distance Z3 between the rear surface of the compensation group C and the front surface of the rear fixed group D-1 ranges from 0.3 mm to 7.85 mm, the distance between the rear surface of the rear fixed group D-1 and the front surface of the rear fixed group D-2 is 35 mm, and the distance between the rear surface of the rear fixed group D-2 and the detector is kept at 13.20 mm.

4. The large format wide field of view long wave infrared continuous zoom lens of claim 1, wherein: The distance between the center vertex of the front surface of the front fixed group A and the image surface is controlled at 147.36 mm in the full zoom state.

5. The large format wide field of view long wave infrared continuous zoom lens of claim 1, wherein: The front surface and the rear surface of the front fixed group A, the front surface and the rear surface of the variable group B, the front surface and the rear surface of the compensation group C, the front surface and the rear surface of the rear fixed group D-1, and the front surface of the rear fixed group D-2 are even aspheric, and the surface equation expression is as follows: ； wherein c is the curvature radius, k is the conic coefficient, r is the normalized radius coordinate, and a1, a2, a3, a4, a5 and a6 are aspheric coefficients.

6. The large format wide field of view long wave infrared continuous zoom lens of claim 3, wherein: The coefficients in the front surface surface equation of the front fixed group A are respectively: c=1 / r, r=144.38mm, K=0, a1=0, a2=-3.6588x10 -8 -3, a3=9.2365x10 -12 -3, a4=2.6654x10 -15 -3. The coefficients in the surface equation of the rear surface of the front fixing group A are respectively: c=1 / r, r=272.965mm, K=0, a1=0, a2=-1.6635x10 -8 -3, a3=2.6565x10 -11 -3, a4=-5.6654x10 -15 -3, a5=9.8874x10 -20 -3; The coefficients in the front surface face type equation of the variable magnification group B are respectively: c=1 / r, r=-256.224mm, K=0, a1=0, a2=-3.5852x10 -6 -3, a3=2.3398x10 -9 -3, a4=-4.6658x10 -12 -4, a5=1.3256x10 -15 ; The coefficients in the surface equation of the rear surface of the variable magnification group B are respectively: c=1 / r, r=137.69mm, K=0, a1=0, a2=-3.6658x10 -6 , a3=7.5755x10 -9 , a4=-1.0245x10 -12 , a5=1.3369x10 -16 ; The coefficients in the front surface profile equation of the compensation group C are respectively: c=1 / r, r=132.778mm, K=0, a1=0, a2=5.294x10 -8 , a3=6.904x10 -10 , a4=2.203x10 -12 , a5=-3.277x10 -15 ; The coefficients in the back surface profile equation of the compensation group C are respectively: c=1 / r, r=-208.111mm, K=0, a1=0, a2=-2.152x10 -6 , a3=3.1733x10 -9 , a4=-2.2339x10 -12 , a5=1.9853x10 -15 ; The coefficients in the front surface profile equation of the D-1 rear fixing group are respectively: c=1 / r, r=-1138.379mm, K=0, a1=0, a2=-2.7699x10 -5 -4, a3=8.6238x10 -9 -4, a4=-4.8826x10 -13 -4. The coefficients in the equation of the back surface profile of the D-1 rear fixing group are respectively: c=1 / r, r=117.706mm, K=0, a1=0, a2=-1.0100x10 -5 -3, a3=3.5572x10 -9 -3, a4=-5.3388x10 -12 -4. The coefficients in the front surface profile equation of the D-2 post-fixing group are respectively: c=1 / r, r=38.201mm, K=0, a1=0, a2=-3.2527x10 -7 , a3=-2.8866x10 -8 , a4=7.20119x10 -11 , a5=-2.6522x10 -13 , a6=1.2826x10 -16 .

7. The large format wide field of view long wave infrared continuous zoom lens of claim 1, wherein: The rear surface of the front fixed group A is a binary diffractive surface, and the dispersion characteristic expression is as follows: ； where λ m represents the center wavelength, λ l represents the long wave, λ s represents the short wave, v represents the Abbe number, λ m = 10 μm, λ l = 14 μm, λ s = 8 μm, v = -1.67; wherein the diffractive surface equation of the front fixed group A is as follows: ； wherein c1 = -4.45356414549 x 10 -6 c2 = -7.89463138152255 x 10 -10 m = -4, -3, -2, -1, n = 4.003.

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