A short-wave infrared continuous zoom optical system

Abstract

The present invention belongs to the technical field of imaging optical system design, and relates to a short-wave infrared continuous zoom optical system, which is composed of a positive optical power front fixed lens group, a negative optical power zoom lens group, a negative optical power compensation lens group, a positive optical power rear fixed lens group and a target surface IMG, which are arranged in sequence along the optical axis from the object side to the image side; when the focal length changes from the shortest focal length to the longest focal length, the front fixed lens group and the rear fixed lens group are fixed, the zoom lens group and the compensation lens group move along the optical axis direction to get closer to each other, and when the magnification of the zoom lens group is the minimum value -1, the zoom lens group and the compensation lens group move together along the optical axis from the object side to the image side. The present invention is a large zoom ratio system, and the working band covers the short-wave infrared 900-1700nm. It adopts a typical four-element zoom structure and a negative group compensation design, so that the optical system meets the requirements of compactness and miniaturization, and has a simple and compact structure and good image quality.

Description

Technical Field

[0001] The invention belongs to the technical field of imaging optical system design, and in particular relates to a short-wave infrared continuous zoom optical system. Background Art

[0002] In terms of target recognition, the short-wave infrared imaging system is an important supplement to the thermal imaging system. The detector of the medium-wave infrared imaging system in the thermal imaging system is a cooling detector, which is large in size and high in power consumption. The optical lens material is very limited, and the price of the cooling detector and the optical lens is also very expensive. The cold reflection phenomenon that is common in the medium-wave infrared imaging system will have a certain impact on the imaging effect; in addition, the long-wave infrared imaging system detector in the thermal imaging system has low sensitivity and cannot identify distant targets well. The detector of the short-wave infrared imaging system does not require low-temperature refrigeration, is small in size and low in power consumption, and the optical lens uses low-cost visible light glass materials to meet the design needs, and can better correct the chromatic aberration of the system, which can realize long-distance target recognition. Under the night vision conditions of the night sky glow, the photon irradiance is mainly distributed in the short-wave infrared band range of 1000 to 1800nm, which makes the night vision imaging effect of the short-wave infrared imaging system have significant outstanding advantages compared with the visible light night vision imaging system, with high imaging contrast and clear target details. Even on a moonless night, the target object can be seen very clearly. The scattering characteristics of water vapor on the spectrum enable the short-wave infrared imaging system to distinguish water vapor and smoke better than the visible light imaging system.

[0003] Due to the wide operating band range of short-wave infrared imaging systems, the difficulty of chromatic aberration correction increases when designing optical systems, and the design of continuous zoom systems with large zoom ratios is even more difficult. Therefore, fixed focal length systems or zoom systems with small zoom ratios are currently the main focus. This leads to certain limitations in the application of short-wave infrared imaging systems. In order to meet the use requirements in many fields such as site monitoring, fire warning, and forest fire prevention, it is very necessary to design a short-wave infrared continuous zoom optical system with a large zoom ratio. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a short-wave infrared continuous zoom optical system, the working band of which covers 900-1700nm and the focal length range is 12-240mm, which can better identify targets within a larger distance range.

[0005] In order to solve the above technical problems, the short-wave infrared continuous zoom optical system of the present invention is composed of a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group and a target surface IMG which are arranged in sequence from the object side to the image side along the optical axis; the optical power of the front fixed lens group is positive, the optical power of the zoom lens group is negative, the optical power of the compensation lens group is negative, and the optical power of the rear fixed lens group is positive; the front fixed lens group is composed of a biconvex lens A1, a meniscus lens A2 and a meniscus lens A3 which are arranged in sequence from the object side to the image side The zoom lens group is composed of a meniscus lens B1, a biconcave lens B2 and a meniscus lens B3 arranged in sequence from the object side to the image side, and the biconcave lens B2 and the meniscus lens B3 form a cemented lens group; the compensation lens group is composed of a biconcave lens C1 and a lens C2 arranged in sequence from the object side to the image side; the rear fixed lens group is composed of a biconvex lens D1, a biconvex lens D2, a meniscus lens D3, a meniscus lens D4 and a meniscus lens D5 arranged in sequence from the object side to the image side; the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 Focal length f of the front fixed lens group A The relationship satisfied is: 1.20<f A1 / f A <1.5;-2.35<f A2 / f A <-1.80;1.25<f A3 / f A <1.45; focal length f of meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f with zoom lens group B B The relationship satisfied is: 1.41<f B1 / f B <1.80;0.82<f B2 / f B <0.95;-1.62<f B3 / f B <-1.15; focal length f of biconcave lens C1 C1 , the focal length f of the biconvex or meniscus lens C2 C2 Focal length f of the compensation lens group C The relationship satisfied is: 0.26<f C1 / f C <0.52;-1.10<f C2 / f C <-0.42; focal length f of biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4D4 、Focal length f of meniscus lens D5 D5 The focal length f of the rear fixed lens group D D The relationship satisfied is: 0.90<f D1 / f D <1.32;1.38<f D2 / f D <2.20;-2.90<f D3 / f D <-1.19、-4.28<f D4 / f D <-1.30;1.22<f D5 / f D <2.45; at the shortest focal length, the distance between the zoom lens group and the compensating lens group is the farthest. When the focal length changes from the shortest focal length to the longest focal length, the front fixed lens group and the rear fixed lens group remain stationary, and the zoom lens group and the compensating lens group move closer to each other along the optical axis. When the magnification of the zoom lens group is the minimum value -1, the zoom lens group and the compensating lens group move together along the optical axis from the object side to the image side.

[0006] The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is:

[0007] 0.13<TL1 / TTL<0.175; 0.087<TL2 / TTL<0.10; 0.018<TL3 / TTL<0.024; 0.094<TL4 / TTL<0.14;

[0008] Wherein, TTL is the distance between the front surface of the biconvex lens A1 and the target surface on the optical axis; TL1 is the distance between the front surface of the biconvex lens A1 and the rear surface of the meniscus lens A3 on the optical axis; TL2 is the distance between the front surface of the meniscus lens B1 and the rear surface of the meniscus lens B3 on the optical axis; TL3 is the distance between the front surface of the biconcave lens C1 and the rear surface of the lens C2 on the optical axis; TL4 is the distance between the front surface of the biconvex lens D1 and the rear surface of the meniscus lens D5 on the optical axis.

[0009] The thickness of the biconvex lens A1 is 12.70 mm to 14.41 mm, the thickness of the meniscus lens A2 is 2.60 mm to 3.00 mm, the thickness of the meniscus lens A3 is 9.02 mm to 10.34 mm, and the thickness of the meniscus lens B1 is 1.20 mm to 1.40 mm. mm, the thickness of the biconcave lens B2 is 1.20mm~1.40mm, the thickness of the meniscus lens B3 is 4.18mm~4.85mm, the thickness of the biconcave lens C1 is 1.20mm~1.40mm, the thickness of the lens C2 is 2.29mm~2.78mm, the thickness of the biconvex lens D1 is 4.77mm~6.07mm, the thickness of the biconvex lens D2 is 2.34mm~3.86mm, the thickness of the meniscus lens D3 is 1.20mm~1.40mm, the thickness of the meniscus lens D4 is 1.40mm~7.06mm, and the thickness of the meniscus lens D5 is 3.04mm ~4.64mm.

[0010] The air gap between the biconvex lens A1 and the meniscus lens A2 is 0-3.62 mm, the air gap between the meniscus lens A2 and the meniscus lens A3 is 0.18-0.22 mm, the air gap between the meniscus lens A3 and the meniscus lens B1 is 2.0-67.18 mm, the air gap between the meniscus lens B1 and the biconcave lens B2 is 8.83-10.09 mm, the air gap between the biconcave lens B2 and the meniscus lens B3 is 0, the air gap between the meniscus lens B3 and the biconcave lens C1 is 3.92-62.77 mm, the air gap between the biconcave lens C1 and the lens C2 is 0-0.22 mm, the air gap between the lens C2 and the biconvex lens D1 is 1.50-10.65 mm, and the air gap between the biconvex lens D1 and the biconvex lens D2 is 0.18 mm ~0.21mm, the air gap between the biconvex lens D2 and the meniscus lens D3 is 1.53mm~2.52 mm, the air gap between the meniscus lens D3 and the meniscus lens D4 is 0.19mm~0.21mm, and the air gap between the meniscus lens D4 and the meniscus lens D5 is 0~2.30 mm.

[0011] The air space between the meniscus lens A3 and the meniscus lens B1 is 1.85 mm to 2.00 mm at long focus, 54.28 mm to 58.53 mm at medium focus, and 61.87 mm to 67.18 mm at short focus; the air space between the meniscus lens B3 and the biconcave lens C1 is 57.79 mm to 62.77 mm at long focus, 3.92 mm to 5.54 mm at medium focus, and 4.21 mm to 6.16 mm at short focus; the air space between the lens C2 and the biconvex lens D1 is 8.71 mm to 9.73 mm at long focus, 9.31 mm to 10.65 mm at medium focus, and 1.50 mm at short focus.

[0012] All lenses of the optical system are glass spherical lenses. The refractive index of the biconvex lens A1 is N A1 and Abbe number V A1 , the refractive index N of the meniscus lens A2 A2 and Abbe number V A2 Satisfy: |N A1 -N A2 |>0.44,|V A1 -V A2 |>62.50; refractive index N of biconcave lens B2 B2 and Abbe number V B2 , the refractive index N of the meniscus lens B3 B3 and Abbe number V B3 Satisfy: |N B2 -N B3 |>0.18,|V B2 -V B3 |>24.50; refractive index N of biconcave lens C1 C1 and Abbe number V C1 , the refractive index N of lens C2 C2 and Abbe number V C2 Satisfy: |N C1 -N C2 |>0.01,|V C1 -V C2 |>13.40; refractive index N of biconvex lens D2 D2 and Abbe number V D2 , the refractive index N of the meniscus lens D3 D3 and Abbe number V D3 Satisfy: |N D2 -N D3 |>0.16,|V D2 -V D3 |>7.75; the refractive index N of the meniscus lens D4 D4 and Abbe number V D4 、The refractive index N of the meniscus lens D5 D5 and Abbe number V D5 Satisfy: |N D4 -N D5 |>0.30,|V D4 -V D5 |>35.00; refractive index N of meniscus lens A3 A3 and Abbe number V A3 Satisfaction: 1.56<N A3 <1.63、67.20<V A3 <71.35; refractive index N of meniscus lens B1 B1 and Abbe number V B1Satisfaction: 1.42<N B1 <1.86、37.20<V B1 <95.05; biconvex lens D1 refractive index N D1 and Abbe number V D1 Satisfaction: 1.42<N D1 <1.50、81.60<V D1 <95.05.

[0013] The biconvex lens A1 uses crown glass material; the meniscus lens A2 uses flint glass material; the meniscus lens A3 uses crown glass material; the meniscus lens B1 uses crown glass material or flint glass material; the biconcave lens B2 uses crown glass material; the meniscus lens B3 uses flint glass material; the biconcave lens C1 uses flint glass material; the lens C2 uses flint glass material; the biconvex lens D1 uses crown glass material; the biconvex lens D2 uses crown glass or flint glass material; the meniscus lens D3 uses flint glass material; the meniscus lens D4 uses flint glass material; and the meniscus lens D5 uses crown glass material.

[0014] The biconvex lens A1 and the meniscus lens A2 are single lenses or form a cemented lens group; the lens C2 is a biconvex lens, and the biconcave lens C1 and the lens C2 form a cemented lens group; the meniscus lens D4 and the meniscus lens D5 are single lenses.

[0015] The biconvex lens A1 and the meniscus lens A2 are single lenses respectively; the lens C2 is a meniscus lens with positive focal length, and the biconcave lens C1 and the lens C2 form a cemented lens group; the meniscus lens D4 and the meniscus lens D5 are single lenses respectively or form a cemented lens group.

[0016] The biconvex lens A1 and the meniscus lens A2 form a cemented lens group; the lens C2 is a meniscus lens with positive focal length, the biconcave lens C1 and the lens C2 are single lenses respectively; the meniscus lens D4 and the meniscus lens D5 form a cemented lens group.

[0017] The beneficial effects of the present invention are as follows: the optical system is a zoom system with a large zoom ratio of 20 times, a wide focal length range, and a working band covering short-wave infrared 900-1700nm. The imaging system is less affected by atmospheric scattering in the working band, and can be used not only under harsh climatic conditions such as smoke and haze during the day, but also under night glow or moonless conditions to better identify targets within a large distance range; in order to reduce the structural size of the optical system, the optical system adopts a typical negative group mechanical compensation design method, which can reduce the secondary spectrum of the optical system while obtaining a large zoom ratio, better correct the chromatic aberration and the secondary spectrum, and avoid the adverse effects of the secondary spectrum when the optical system identifies a distant target in a long focal length; the variable F number is used to reduce the size of the first lens, the system structure is simple and compact, the size is small, the weight is light, the installation and adjustment difficulty is small, the cost is low, and the image quality is good; the optical system has a long back intercept, which is conducive to the introduction of other mechanical mechanisms; the lens material of the optical system adopts conventional visible light lens material, which can better correct the chromatic aberration and other aberrations of the optical system, and the lens material is low in price, easy to process, and the system cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 to Figure 3 They are respectively the optical structure diagrams of the short-focus, medium-focus and long-focus of the short-wave infrared continuous zoom optical system embodiment 1 of the present invention;

[0019] Figures 4 to 6 They are respectively the modulation transfer function curves of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 1 of the present invention;

[0020] Figure 7 to Figure 9 They are respectively the distortion grid diagrams of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 1 of the present invention;

[0021] Figure 10 to Figure 12 They are respectively the optical structure diagrams of the short-focus, medium-focus and long-focus of Embodiment 2 of the short-wave infrared continuous zoom optical system of the present invention;

[0022] Figure 13 to Figure 15 They are respectively the modulation transfer function curves of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 2 of the present invention;

[0023] Figure 16 to Figure 18 They are respectively the distortion grid diagrams of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 2 of the present invention;

[0024] Figure 19 to Figure 21 They are respectively the optical structure diagrams of the short-focus, medium-focus and long-focus of Embodiment 3 of the short-wave infrared continuous zoom optical system of the present invention;

[0025] Figure 22 to Figure 24They are respectively the modulation transfer function curves of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 3 of the present invention;

[0026] Figure 25 to Figure 27 They are respectively the distortion grid diagrams of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 3 of the present invention;

[0027] Figure 28 to Figure 30 They are respectively the optical structure diagrams of the short-focus, medium-focus and long-focus of the short-wave infrared continuous zoom optical system embodiment 4 of the present invention;

[0028] Figure 31 to Figure 33 They are respectively the modulation transfer function curves of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 4 of the present invention;

[0029] Figure 34 to Figure 36 They are respectively the distortion grid diagrams of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 4 of the present invention;

[0030] Figure 37 to Figure 39 They are respectively the optical structure diagrams of the short-focus, medium-focus and long-focus of Embodiment 5 of the short-wave infrared continuous zoom optical system of the present invention;

[0031] Figure 40 to Figure 42 They are respectively the modulation transfer function curves of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 5 of the present invention;

[0032] Figure 43 to Figure 45 They are respectively the distortion grid diagrams of short focus, medium focus and long focus under normal temperature environment of the short-wave infrared continuous zoom optical system embodiment 5 of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0034] The short-wave infrared continuous zoom optical system of the present invention is composed of a front fixed lens group, a variable magnification lens group, a compensating lens group, a rear fixed lens group and a target surface IMG which are sequentially arranged along the optical axis from the object side to the image side. The optical focal power of the front fixed lens group is positive, the optical focal power of the variable magnification lens group is negative, the optical focal power of the compensating lens group is negative, and the optical focal power of the rear fixed lens group is positive. The front fixed lens group is composed of a biconvex lens A1, a meniscus lens A2 and a meniscus lens A3 which are sequentially arranged from the object side to the image side; the variable magnification lens group is composed of a meniscus lens B1, a biconcave lens B2 and a meniscus lens B3 which are sequentially arranged from the object side to the image side, and the biconcave lens B2 and the meniscus lens B3 form a cemented lens group; the compensating lens group is composed of a biconcave lens C1 and a lens C2 which are sequentially arranged from the object side to the image side; and the rear fixed lens group is composed of a biconvex lens D1, a biconvex lens D2, a meniscus lens D3, a meniscus lens D4 and a meniscus lens D5 which are sequentially arranged from the object side to the image side.

[0035] The biconvex lens A1 and the meniscus lens A2 can be single lenses or form a cemented lens group; the biconcave lens C1 and the lens C2 can be single lenses or form a cemented lens group, and the lens C2 can be a biconvex lens or a meniscus lens; the meniscus lens D4 and the meniscus lens D5 can be single lenses or form a cemented lens group.

[0036] The focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 Focal length f of the front fixed lens group A The relationship satisfied is: 1.20<f A1 / f A <1.5;-2.35<f A2 / f A <-1.80;1.25<f A3 / f A <1.45; focal length f of meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f with zoom lens group B B The relationship satisfied is: 1.41<f B1 / f B <1.80;0.82<f B2 / f B <0.95;-1.62<f B3 / f B <-1.15; focal length f of biconcave lens C1 C1 , the focal length f of the biconvex or meniscus lens C2 C2 Focal length f of the compensation lens group C The relationship satisfied is: 0.26<f C1 / fC <0.52;-1.10<f C2 / f C <-0.42; focal length f of biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 The focal length f of the rear fixed lens group D D The relationship satisfied is: 0.90<f D1 / f D <1.32;1.38<f D2 / f D <2.20;-2.90<f D3 / f D <-1.19、-4.28<f D4 / f D <-1.30;1.22<f D5 / f D <2.45.

[0037] The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is:

[0038] 0.13<TL1 / TTL<0.175; 0.087<TL2 / TTL<0.10; 0.018<TL3 / TTL<0.024; 0.094<TL4 / TTL<0.14;

[0039] Wherein, TTL is the distance between the front surface of the biconvex lens A1 and the target surface on the optical axis; TL1 is the distance between the front surface of the biconvex lens A1 and the rear surface of the meniscus lens A3 on the optical axis; TL2 is the distance between the front surface of the meniscus lens B1 and the rear surface of the meniscus lens B3 on the optical axis; TL3 is the distance between the front surface of the biconcave lens C1 and the rear surface of the lens C2 on the optical axis; TL4 is the distance between the front surface of the biconvex lens D1 and the rear surface of the meniscus lens D5 on the optical axis.

[0040] The thickness of the biconvex lens A1 is 12.70mm~14.41mm, the thickness of the meniscus lens A2 is 2.60mm~3.00mm, the thickness of the meniscus lens A3 is 9.02mm~10.34mm, and the thickness of the meniscus lens B1 is 1.20mm~1.40 mm, the thickness of the biconcave lens B2 is 1.20mm~1.40mm, the thickness of the meniscus lens B3 is 4.18mm~4.85mm, the thickness of the biconcave lens C1 is 1.20mm~1.40mm, the thickness of the lens C2 is 2.29mm~2.78mm, the thickness of the biconvex lens D1 is 4.77mm~6.07mm, the thickness of the biconvex lens D2 is 2.34mm~3.86mm, the thickness of the meniscus lens D3 is 1.20mm~1.40mm, the thickness of the meniscus lens D4 is 1.40mm~7.06mm, and the thickness of the meniscus lens D5 is 3.04mm ~4.64mm.

[0041] The air gap between the biconvex lens A1 and the meniscus lens A2 is 0~3.62mm, the air gap between the meniscus lens A2 and the meniscus lens A3 is 0.18mm~0.22mm, the air gap between the meniscus lens A3 and the meniscus lens B1 is 2.0mm~67.18mm, 1.85mm~2.00mm at long focus, 54.28mm~58.53mm at medium focus, and 61.87mm~61.87mm at short focus. The air spacing between the meniscus lens B1 and the biconcave lens B2 is 8.83mm~10.09mm, the air spacing between the biconcave lens B2 and the meniscus lens B3 is 0, the air spacing between the meniscus lens B3 and the biconcave lens C1 is 3.92mm~62.77mm, 57.79mm~62.77mm at long focus, 3.92mm~5.54mm at medium focus, and 4.21mm~6.16mm at short focus; the air spacing between the biconcave lens C1 and the lens C2 is 0~0.22mm, the air spacing between the lens C2 and the biconvex lens D1 is 1.50mm~10.65mm, 8.71mm~9.73mm at long focus, 9.31mm~10.65mm at medium focus, and 1.50mm at short focus; the air spacing between the biconvex lens D1 and the biconvex lens D2 is 0.18mm ~0.21mm, the air gap between the biconvex lens D2 and the meniscus lens D3 is 1.53mm~2.52 mm, the air gap between the meniscus lens D3 and the meniscus lens D4 is 0.19mm~0.21mm, and the air gap between the meniscus lens D4 and the meniscus lens D5 is 0~2.30 mm.

[0042] All lenses in the optical system are glass spherical lenses. The refractive index of the biconvex lens A1 is N A1 and Abbe number V A1 , the refractive index N of the meniscus lens A2A2 and Abbe number V A2 Satisfy: |N A1 -N A2 |>0.44,|V A1 -V A2 |>62.50; refractive index N of biconcave lens B2 B2 and Abbe number V B2 , the refractive index N of the meniscus lens B3 B3 and Abbe number V B3 Satisfy: |N B2 -N B3 |>0.18,|V B2 -V B3 |>24.50; refractive index N of biconcave lens C1 C1 and Abbe number V C1 , the refractive index N of lens C2 C2 and Abbe number V C2 Satisfy: |N C1 -N C2 |>0.01,|V C1 -V C2 |>13.40; refractive index N of biconvex lens D2 D2 and Abbe number V D2 , the refractive index N of the meniscus lens D3 D3 and Abbe number V D3 Satisfy: |N D2 -N D3 |>0.16,|V D2 -V D3 |>7.75; the refractive index N of the meniscus lens D4 D4 and Abbe number V D4 、The refractive index N of the meniscus lens D5 D5 and Abbe number V D5 Satisfy: |N D4 -N D5 |>0.30,|V D4 -V D5 |>35.00; refractive index N of meniscus lens A3 A3 and Abbe number V A3 Satisfaction: 1.56<N A3 <1.63、67.20<V A3 <71.35; refractive index N of meniscus lens B1 B1 and Abbe number V B1 Satisfaction: 1.42<N B1 <1.86、37.20<V B1 <95.05; biconvex lens D1 refractive index N D1 and Abbe number V D1Satisfaction: 1.42<N D1 <1.50、81.60<V D1 <95.05.

[0043] The biconvex lens A1 is made of crown glass material, such as fluorine crown glass material H-FK61B or H-FK95N; the meniscus lens A2 is made of flint glass material, such as heavy flint glass material H-ZF72A or H-ZF88; the meniscus lens A3 is made of crown glass material, such as heavy phosphorus crown glass material H-ZPK5; the meniscus lens B1 is made of crown glass material or flint glass material, such as fluorine crown glass material H-FK95N or heavy lanthanum flint glass material H-ZLAF76A; the biconcave lens B2 is made of crown glass material, such as heavy crown glass material H-ZK5; the meniscus lens B3 is made of flint glass material, such as heavy flint glass material H-ZF73; the biconcave lens C1 is made of flint glass material, such as heavy lanthanum flint glass material H-ZLAF69 or H-ZLAF5 3B; lens C2 uses flint glass material, such as heavy flint glass material H-ZF52, H-ZF73 or H-ZF88; biconvex lens D1 uses crown glass material, such as fluorine crown glass material H-FK71, H-FK61B or H-FK95N; biconvex lens D2 uses crown glass or flint glass material, such as crown glass material H-K51, fluorine crown glass material H-FK61B or heavy flint glass material H-ZF13; meniscus lens D3 uses flint glass material, such as heavy flint glass material H-ZF88; meniscus lens D4 uses flint glass material, such as heavy lanthanum flint glass material H-ZLAF71 or H-ZLAF53B; meniscus lens D5 uses crown glass material, such as fluorine crown glass material H-FK61B or H-FK95N.

[0044] The front surface of the double concave lens C1 is the aperture of the optical system, and there is no need to add an additional mechanical aperture; at the shortest focal length, the distance between the zoom lens group and the compensating lens group is the farthest. When the focal length changes from the shortest focal length to the longest focal length, the front fixed lens group and the rear fixed lens group are fixed, and the zoom lens group and the compensating lens group move closer to each other along the optical axis. When the magnification of the zoom lens group is the minimum value -1, the zoom lens group and the compensating lens group are closest to each other, and then move together along the optical axis from the object side to the image side.

[0045] The short-wave infrared continuous zoom optical system of the present invention is described in detail below with reference to specific embodiments.

[0046] Example 1: Figure 1 to Figure 3As shown in the figure, in the short-wave infrared continuous zoom optical system of this embodiment, the focal power of the biconvex lens A1 is positive, the focal power of the meniscus lens A2 is negative, and the convex surface faces the image side and the concave surface faces the object side, the focal power of the meniscus lens A3 is positive, and the convex surface faces the object side and the concave surface faces the image side; the biconvex lens A1 and the meniscus lens A2 are single lenses respectively; the focal power of the meniscus lens B1 is negative, and the convex surface faces the object side and the concave surface faces the image side, the focal power of the biconcave lens B2 is negative, the focal power of the meniscus lens B3 is positive, and the convex surface faces the object side and the concave surface faces the image side, and the biconcave lens B2 and the meniscus lens The lens B3 forms a cemented lens group; the focal power of the double concave lens C1 is negative, the focal power of the lens C2 is positive, and a double convex lens is used; the double concave lens C1 and the lens C2 form a cemented lens group; the focal power of the double convex lens D1 is positive, the focal power of the double convex lens D2 is positive, the focal power of the meniscus lens D3 is negative, and the convex surface faces the image side and the concave surface faces the object side, the focal power of the meniscus lens D4 is negative, and the convex surface faces the object side and the concave surface faces the image side, the focal power of the meniscus lens D5 is positive, and the convex surface faces the object side and the concave surface faces the image side; the meniscus lens D4 and the meniscus lens D5 are single lenses respectively.

[0047] The specific parameters of each optical element in this embodiment are shown in Table 1.

[0048] Table 1

[0049] In this embodiment, the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 The focal length of the front fixed lens group is f A Satisfying the relationship, the focal length f of the meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f of the zoom lens group B Satisfying the relationship, the focal length f of the biconcave lens C1 C1 , the focal length f of lens C2 C2 The focal length of the compensation lens group is f C Satisfying the relationship, the focal length f of the biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 Focal length f of the rear fixed lens group DThe satisfied relationship is shown in Table 2. The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is shown in Table 2.

[0050] Table 2

[0051] In this embodiment, the air gaps d1, d2, d3 and d4 at different focal lengths are shown in Table 3 respectively.

[0052] Table 3

[0053] In this embodiment, the working band of the short-wave infrared continuous zoom optical system is 900-1700 nm, the focal length is 12-240 mm, the F number is 4.8-6.5, and it can be adapted to a 640×512, 15 μm short-wave infrared detector. Figures 4 to 6 It is the optical transfer function (MTF) curve of each field of view of short focus, medium focus and long focus when the optical system works at room temperature. The MTF curve can comprehensively reflect the imaging properties of the optical system and is the simplest and most intuitive method for evaluating image quality.

[0054] In the MTF curve, the horizontal axis represents the spatial frequency, the unit is the number of line pairs / mm, and the vertical axis represents the modulation amount. The smaller the modulation amount, the worse the spatial resolution. It can be seen from the figure that the MTF of each field of view at different focal lengths is greater than 0.3, indicating that the target can be imaged clearly. Figure 7 to Figure 9 It is the distortion grid diagram of the optical system. Distortion does not affect the clarity of the image, but only represents the deformation of the image. The smaller the distortion, the smaller the deformation of the image. In the distortion grid diagram, the horizontal axis represents the horizontal field of view, in millimeters, and the vertical axis represents the vertical field of view, in millimeters. It can be seen from the figure that the distortion of each field of view of the short focus is less than 6.4%, the distortion of each field of view of the medium focus is less than 3.3%, and the distortion of each field of view of the long focus is less than 0.9%, indicating that the degree of deformation of the image is not obvious.

[0055] Example 2: Figure 10 to Figure 12 As shown, the difference between the short-wave infrared continuous zoom optical system of this embodiment and the embodiment 1 is that: the lens C2 is a meniscus lens; the meniscus lens D4 and the meniscus lens D5 form a cemented lens group.

[0056] The specific parameters of each optical element in this embodiment are shown in Table 4.

[0057] Table 4

[0058] In this embodiment, the focal length f of the biconvex lens A1 isA1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 The focal length of the front fixed lens group is f A Satisfying the relationship, the focal length f of the meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f of the zoom lens group B Satisfying the relationship, the focal length f of the biconcave lens C1 C1 , the focal length f of lens C2 C2 The focal length of the compensation lens group is f C Satisfying the relationship, the focal length f of the biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 Focal length f of the rear fixed lens group D The satisfied relationship is shown in Table 5, and the relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is shown in Table 5.

[0059] Table 5

[0060] In this embodiment, the air gaps d1, d2, d3 and d4 at different focal lengths are shown in Table 6 respectively.

[0061] Table 6

[0062] In this embodiment, the working band of the short-wave infrared continuous zoom optical system is 900-1700 nm, the focal length is 12-240 mm, the F number is 4.8-6.5, and it can be adapted to a 640×512, 15 μm short-wave infrared detector. Figure 13 to Figure 15 It is the optical transfer function (MTF) curve of each field of view of short focus, medium focus and long focus when the optical system works at room temperature. It can be seen from the figure that the MTF of each field of view at different focal lengths is greater than 0.4, indicating that the target can be clearly imaged. Figure 16 to Figure 18 It is the distortion grid diagram of the optical system. From the diagram, we can see that the distortion of each short-focus field of view is less than 5.3%, the distortion of each medium-focus field of view is less than 3.8%, and the distortion of each long-focus field of view is less than 1.1%, indicating that the degree of image deformation is not obvious.

[0063] Example 3: Figure 19 to Figure 21As shown, the difference between the short-wave infrared continuous zoom optical system of this embodiment and the embodiment 1 is that: the lens C2 is a meniscus lens; the biconvex lens A1 and the meniscus lens A2 form a cemented lens group.

[0064] The specific parameters of each optical element in this embodiment are shown in Table 7.

[0065] Table 7

[0066] In this embodiment, the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 The focal length of the front fixed lens group is f A Satisfying the relationship, the focal length f of the meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f of the zoom lens group B Satisfying the relationship, the focal length f of the biconcave lens C1 C1 , the focal length f of lens C2 C2 The focal length of the compensation lens group is f C Satisfying the relationship, the focal length f of the biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 Focal length f of the rear fixed lens group D The satisfied relationship is shown in Table 8, and the relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is shown in Table 8.

[0067] Table 8

[0068] In this embodiment, the air gaps d1, d2, d3 and d4 at different focal lengths are shown in Table 9 respectively.

[0069] Table 9

[0070] In this embodiment, the working band of the short-wave infrared continuous zoom optical system is 900-1700 nm, the focal length is 12-240 mm, the F number is 4.8-6.5, and it can be adapted to a 640×512, 15 μm short-wave infrared detector. Figure 22 to Figure 24It is the optical transfer function (MTF) curve of each field of view of short focus, medium focus and long focus when the optical system works at room temperature. It can be seen from the figure that the MTF of each field of view at different focal lengths is greater than 0.22, indicating that the target can be clearly imaged. Figure 25 to Figure 27 It is the distortion grid diagram of the optical system. From the diagram, we can see that the distortion of each short-focus field of view is less than 5.5%, the distortion of each medium-focus field of view is less than 2.6%, and the distortion of each long-focus field of view is less than 0.3%, indicating that the degree of image deformation is not obvious.

[0071] Example 4: Figure 28 to Figure 30 As shown, the difference between the short-wave infrared continuous zoom optical system of this embodiment and that of Embodiment 1 is that the biconvex lens A1 and the meniscus lens A2 form a cemented lens group.

[0072] The specific parameters of each optical element in this embodiment are shown in Table 10.

[0073] Table 10

[0074] In this embodiment, the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 The focal length of the front fixed lens group is f A Satisfying the relationship, the focal length f of the meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f of the zoom lens group B Satisfying the relationship, the focal length f of the biconcave lens C1 C1 , the focal length f of lens C2 C2 The focal length of the compensation lens group is f C Satisfying the relationship, the focal length f of the biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 Focal length f of the rear fixed lens group D The satisfied relationships are shown in Table 11. The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is shown in Table 11.

[0075] Table 11

[0076] In this embodiment, the air gaps d1, d2, d3 and d4 at different focal lengths are shown in Table 12 respectively.

[0077] Table 12

[0078] In this embodiment, the working band of the short-wave infrared continuous zoom optical system is 900-1700 nm, the focal length is 12-240 mm, the F number is 4.8-6.5, and it can be adapted to a 640×512, 15 μm short-wave infrared detector. Figure 31 to Figure 33 It is the optical transfer function (MTF) curve of each field of view of short focus, medium focus and long focus when the optical system works at room temperature. It can be seen from the figure that the MTF of each field of view at different focal lengths is greater than 0.2, indicating that the target can be imaged clearly. Figure 34 to Figure 36 It is the distortion grid diagram of the optical system. From the diagram, we can see that the distortion of each short-focus field of view is less than 5.7%, the distortion of each medium-focus field of view is less than 2.5%, and the distortion of each long-focus field of view is less than 0.4%, indicating that the degree of image deformation is not obvious.

[0079] Example 5: Figure 37 to Figure 39 As shown, the difference between the short-wave infrared continuous zoom optical system of this embodiment and embodiment 1 is that lens C2 adopts a meniscus lens C2; the biconvex lens A1 and the meniscus lens A2 form a cemented lens group; the biconcave lens C1 and the meniscus lens C2 are single lenses respectively; and the meniscus lens D4 and the meniscus lens D5 form a cemented lens group.

[0080] The specific parameters of each optical element in this embodiment are shown in Table 13.

[0081] Table 13

[0082] In this embodiment, the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 The focal length of the front fixed lens group is f A Satisfying the relationship, the focal length f of the meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f of the zoom lens group B Satisfying the relationship, the focal length f of the biconcave lens C1 C1 , the focal length f of lens C2 C2 The focal length of the compensation lens group is f C Satisfying the relationship, the focal length f of the biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 Focal length f of the rear fixed lens group D The satisfied relationships are shown in Table 14. The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is shown in Table 14.

[0083] Table 14

[0084] In this embodiment, the air gaps d1, d2, d3 and d4 at different focal lengths are shown in Table 15 respectively.

[0085] Table 15

[0086] In this embodiment, the working band of the short-wave infrared continuous zoom optical system is 900-1700 nm, the focal length is 12-240 mm, the F number is 4.8-6.5, and it can be adapted to a 640×512, 15 μm short-wave infrared detector. Figure 40 to Figure 42 It is the optical transfer function (MTF) curve of each field of view of short focus, medium focus and long focus when the optical system works at room temperature. It can be seen from the figure that the MTF of each field of view at different focal lengths is greater than 0.2, indicating that the target can be imaged clearly. Figure 43 to Figure 45 It is the distortion grid diagram of the optical system. From the diagram, we can see that the distortion of each short-focus field of view is less than 5.7%, the distortion of each medium-focus field of view is less than 2.5%, and the distortion of each long-focus field of view is less than 0.5%, indicating that the degree of image deformation is not obvious.

Claims

1. A short-wave infrared continuous zoom optical system, characterized in that It is composed of a front fixed lens group, a zoom lens group, a compensating lens group, a rear fixed lens group and a target surface IMG which are arranged in sequence from the object side to the image side along the optical axis; the optical power of the front fixed lens group is positive, the optical power of the zoom lens group is negative, the optical power of the compensating lens group is negative, and the optical power of the rear fixed lens group is positive; the front fixed lens group is composed of a biconvex lens A1, a meniscus lens A2 and a meniscus lens A3 which are arranged in sequence from the object side to the image side; the zoom lens group is composed of a meniscus lens B1, a biconcave lens B2 and a meniscus lens B3 which are arranged in sequence from the object side to the image side, and the biconcave lens B2 and the meniscus lens B3 form a cemented lens group; The compensation lens group is composed of a biconcave lens C1 and a lens C2 arranged in sequence from the object side to the image side; the rear fixed lens group is composed of a biconvex lens D1, a biconvex lens D2, a meniscus lens D3, a meniscus lens D4 and a meniscus lens D5 arranged in sequence from the object side to the image side; the focal length f of the biconvex lens A1 is A1 、The focal length f of meniscus lens A2 A2 、Focal length f of meniscus lens A3 A3 Focal length f of the front fixed lens group A The relationship satisfied is: 1.20<f A1 / f A <1.5;-2.35<f A2 / f A <-1.80;1.25<f A3 / f A <1.45; focal length f of meniscus lens B1 B1 , the focal length f of the biconcave lens B2 B2 , the focal length f of the meniscus lens B3 B3 Focal length f with zoom lens group B B The relationship satisfied is: 1.41<f B1 / f B <1.80;0.82<f B2 / f B <0.95;-1.62<f B3 / f B <-1.15; focal length f of biconcave lens C1 C1 , the focal length f of the biconvex or meniscus lens C2 C2 Focal length f of the compensation lens group C The relationship satisfied is: 0.26<f C1 / f C <0.52;-1.10<f C2 / f C <-0.42; focal length f of biconvex lens D1 D1 , the focal length f of the biconvex lens D2 D2 、The focal length f of the meniscus lens D3 D3 、The focal length f of the meniscus lens D4 D4 、Focal length f of meniscus lens D5 D5 The focal length f of the rear fixed lens group D D The relationship satisfied is: 0.90<f D1 / f D <1.32;1.38<f D2 / f D <2.20;-2.90<f D3 / f D <-1.19、-4.28<f D4 / f D <-1.30;1.22<f D5 / f D <2.45; at the shortest focal length, the distance between the zoom lens group and the compensating lens group is the farthest. When the focal length changes from the shortest focal length to the longest focal length, the front fixed lens group and the rear fixed lens group remain stationary, and the zoom lens group and the compensating lens group move closer to each other along the optical axis. When the magnification of the zoom lens group is the minimum value -1, the zoom lens group and the compensating lens group move together along the optical axis from the object side to the image side.

2. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The relationship between the total length TL1 of the front fixed lens group on the optical axis, the total length TL2 of the zoom lens group on the optical axis, the total length TL3 of the compensation lens group on the optical axis, the total length TL4 of the rear fixed lens group on the optical axis and the total length TTL of the optical system is: 0.13<TL1 / TTL<0.175; 0.087<TL2 / TTL<0.10; 0.018<TL3 / TTL<0.024; 0.094<TL4 / TTL<0.14; Wherein, TTL is the distance between the front surface of the biconvex lens A1 and the target surface on the optical axis; TL1 is the distance between the front surface of the biconvex lens A1 and the rear surface of the meniscus lens A3 on the optical axis; TL2 is the distance between the front surface of the meniscus lens B1 and the rear surface of the meniscus lens B3 on the optical axis; TL3 is the distance between the front surface of the biconcave lens C1 and the rear surface of the lens C2 on the optical axis; TL4 is the distance between the front surface of the biconvex lens D1 and the rear surface of the meniscus lens D5 on the optical axis.

3. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The thickness of the biconvex lens A1 is 12.70 mm to 14.41 mm, the thickness of the meniscus lens A2 is 2.60 mm to 3.00 mm, the thickness of the meniscus lens A3 is 9.02 mm to 10.34 mm, and the thickness of the meniscus lens B1 is 1.20 mm to 1.40 mm. mm, the thickness of the biconcave lens B2 is 1.20mm~1.40mm, the thickness of the meniscus lens B3 is 4.18mm~4.85mm, the thickness of the biconcave lens C1 is 1.20mm~1.40mm, the thickness of the lens C2 is 2.29mm~2.78mm, the thickness of the biconvex lens D1 is 4.77mm~6.07mm, the thickness of the biconvex lens D2 is 2.34mm~3.86mm, the thickness of the meniscus lens D3 is 1.20mm~1.40mm, the thickness of the meniscus lens D4 is 1.40mm~7.06mm, and the thickness of the meniscus lens D5 is 3.04mm ~4.64mm.

4. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The air gap between the biconvex lens A1 and the meniscus lens A2 is 0-3.62 mm, the air gap between the meniscus lens A2 and the meniscus lens A3 is 0.18-0.22 mm, the air gap between the meniscus lens A3 and the meniscus lens B1 is 2.0-67.18 mm, the air gap between the meniscus lens B1 and the biconcave lens B2 is 8.83-10.09 mm, the air gap between the biconcave lens B2 and the meniscus lens B3 is 0, the air gap between the meniscus lens B3 and the biconcave lens C1 is 3.92-62.77 mm, the air gap between the biconcave lens C1 and the lens C2 is 0-0.22 mm, the air gap between the lens C2 and the biconvex lens D1 is 1.50-10.65 mm, and the air gap between the biconvex lens D1 and the biconvex lens D2 is 0.18 mm ~0.21mm, the air gap between the biconvex lens D2 and the meniscus lens D3 is 1.53mm~2.52 mm, the air gap between the meniscus lens D3 and the meniscus lens D4 is 0.19mm~0.21mm, and the air gap between the meniscus lens D4 and the meniscus lens D5 is 0~2.30 mm.

5. The short-wave infrared continuous zoom optical system according to claim 4, characterized in that The air space between the meniscus lens A3 and the meniscus lens B1 is 1.85 mm to 2.00 mm at long focus, 54.28 mm to 58.53 mm at medium focus, and 61.87 mm to 67.18 mm at short focus; the air space between the meniscus lens B3 and the biconcave lens C1 is 57.79 mm to 62.77 mm at long focus, 3.92 mm to 5.54 mm at medium focus, and 4.21 mm to 6.16 mm at short focus; the air space between the lens C2 and the biconvex lens D1 is 8.71 mm to 9.73 mm at long focus, 9.31 mm to 10.65 mm at medium focus, and 1.50 mm at short focus.

6. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that All lenses of the optical system are glass spherical lenses. The refractive index of the biconvex lens A1 is N A1 and Abbe number V A1 , the refractive index N of the meniscus lens A2 A2 and Abbe number V A2 Satisfy: |N A1 -N A2 |>0.44,|V A1 -V A2 |>62.50; refractive index N of biconcave lens B2 B2 and Abbe number V B2 , the refractive index N of the meniscus lens B3 B3 and Abbe number V B3 Satisfy: |N B2 -N B3 |>0.18,|V B2 -V B3 |>24.50; refractive index N of biconcave lens C1 C1 and Abbe number V C1 , the refractive index N of lens C2 C2 and Abbe number V C2 Satisfy: |N C1 -N C2 |>0.01,|V C1 -V C2 |>13.40; refractive index N of biconvex lens D2 D2 and Abbe number V D2 , the refractive index N of the meniscus lens D3 D3 and Abbe number V D3 Satisfy: |N D2 -N D3 |>0.16,|V D2 -V D3 |>7.75; the refractive index N of the meniscus lens D4 D4 and Abbe number V D4 、The refractive index N of the meniscus lens D5 D5 and Abbe number V D5 Satisfy: |N D4 -N D5 |>0.30,|V D4 -V D5 |>35.00; refractive index N of meniscus lens A3 A3 and Abbe number V A3 Satisfaction: 1.56<N A3 <1.63、67.20<V A3 <71.35; refractive index N of meniscus lens B1 B1 and Abbe number V B1 Satisfaction: 1.42<N B1 <1.86、37.20<V B1 <95.05; biconvex lens D1 refractive index N D1 and Abbe number V D1 Satisfaction: 1.42<N D1 <1.50、81.60<V D1 <95.

05.

7. The short-wave infrared continuous zoom optical system according to claim 6, characterized in that The biconvex lens A1 uses crown glass material; the meniscus lens A2 uses flint glass material; the meniscus lens A3 uses crown glass material; the meniscus lens B1 uses crown glass material or flint glass material; the biconcave lens B2 uses crown glass material; the meniscus lens B3 uses flint glass material; the biconcave lens C1 uses flint glass material; the lens C2 uses flint glass material; the biconvex lens D1 uses crown glass material; the biconvex lens D2 uses crown glass or flint glass material; the meniscus lens D3 uses flint glass material; the meniscus lens D4 uses flint glass material; and the meniscus lens D5 uses crown glass material.

8. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The biconvex lens A1 and the meniscus lens A2 are single lenses or form a cemented lens group; the lens C2 is a biconvex lens, and the biconcave lens C1 and the lens C2 form a cemented lens group; the meniscus lens D4 and the meniscus lens D5 are single lenses.

9. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The biconvex lens A1 and the meniscus lens A2 are single lenses respectively; the lens C2 is a meniscus lens with positive focal length, and the biconcave lens C1 and the lens C2 form a cemented lens group; the meniscus lens D4 and the meniscus lens D5 are single lenses respectively or form a cemented lens group.

10. The short-wave infrared continuous zoom optical system according to claim 1, characterized in that The biconvex lens A1 and the meniscus lens A2 form a cemented lens group; the lens C2 is a meniscus lens with positive focal length, the biconcave lens C1 and the lens C2 are single lenses respectively; the meniscus lens D4 and the meniscus lens D5 form a cemented lens group.

Images