A large magnification ratio, three-waveband, compact continuous zoom optical system

Abstract

The present application relates to a kind of continuous zoom optical systems, in particular to a kind of big zoom ratio, three-waveband, compact continuous zoom optical systems, solve the existing optical system zoom ratio and compression ratio is small, narrow spectral range, volume weight is big, cannot satisfy the problem of application demand of aviation photoelectric equipment.The system includes front fixed group, variable magnification group, rear fixed group front group, adjustable diaphragm, compensation group, rear fixed group back group and filter;Front fixed group includes first negative meniscus lens, first positive lens, second positive lens and first negative lens;Variable magnification group includes second negative meniscus lens, third positive lens, second negative lens, third negative meniscus lens, fourth positive lens and third negative lens;Rear fixed group front group includes fourth negative meniscus lens, fifth positive lens and fifth negative meniscus lens;Compensation group includes fourth negative lens, sixth negative meniscus lens, sixth positive lens, seventh negative meniscus lens and seventh positive lens;Rear fixed group back group includes fifth negative lens and eighth positive lens.

Description

TECHNICAL FIELD

[0001] The present application relates to a continuous zoom optical system, in particular to a large zoom ratio, three-waveband, compact continuous zoom optical system. BACKGROUND

[0002] The continuous zoom optical system is a common optical path form of photoelectric imaging system, which requires that the image surface is stable during zooming and no virtual image is generated. The continuous zoom optical system can be generally divided into an optical compensation system and a mechanical compensation system, and the configurations of these systems are composed of three parts of a front fixed group (focusing group), a zoom group and a rear fixed group. The moving direction and speed of different lens groups of the optical compensation system are the same, and only a mechanical structure is needed to connect the lens groups together to realize linear motion to achieve zooming. The zoom group of the mechanical compensation system includes a zoom group and a compensation group, and the zoom group usually performs linear motion and the compensation group performs nonlinear motion, so that the image surface is maintained stable during the entire zooming process through a specially designed mechanical cam; this configuration not only improves the stability of the image surface, but also increases the compression ratio of the system to a certain extent, which has certain advantages for compact and large zoom ratio systems. The commonly used mechanical compensation systems include positive group compensation, negative group compensation and double group linkage compensation, and these configurations have their own advantages and disadvantages. The double group linkage compensation requires a high mechanical mechanism, but can realize complex optical path zooming with large zoom ratio.

[0003] The existing continuous zoom optical system is mainly based on the positive group compensation and negative group compensation configurations in the mechanical compensation system, which has simple design, small zoom ratio, small compression ratio and narrow spectral range. The system designed by using the double group linkage compensation optical path has narrow spectral range, complex mechanical structure and large system volume and weight, which are not conducive to the application of aviation photoelectric equipment. For new type of aviation photoelectric equipment, the optical path is required to be compact, the zoom ratio is required to be large, the compression ratio is required to be large, the spectral range is required to be wide, the imaging quality is required to be good, and the image surface is required to be stable. The existing optical system configuration cannot meet the application requirements. Therefore, it has high application value to carry out technical research on the large zoom ratio, large compression ratio and wide spectral range continuous zoom optical system suitable for new type of aviation photoelectric equipment. SUMMARY

[0004] The purpose of the present application is to provide a large zoom ratio, three-waveband, compact continuous zoom optical system, so as to solve the technical problems that the existing continuous zoom optical systems with positive group compensation and negative group compensation configurations have small zoom ratio, small compression ratio and narrow spectral range, and the existing continuous zoom optical system with double group linkage compensation has narrow spectral range, complex mechanical structure, large system volume and weight, and cannot meet the application requirements of new type of aviation photoelectric equipment.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A large zoom ratio, three-waveband, compact continuous zoom optical system is characterized by comprising:

[0007] The front fixed group, the variable magnification group, the front group of the rear fixed group, the adjustable diaphragm, the compensation group, the rear group of the rear fixed group and the filter are sequentially arranged along an optical path.

[0008] The front fixed group is a positive lens group comprising a first negative meniscus lens, a first positive lens, a second positive lens and a first negative lens sequentially arranged along an optical path, and the four lenses adopt a four-separation type.

[0009] The variable magnification group comprises a second negative meniscus lens, a third positive lens, a second negative lens, a third negative meniscus lens, a fourth positive lens and a third negative lens sequentially arranged along an optical path; the variable magnification group has a negative focal power and an absolute value of the focal power is greater than or equal to 0.1.

[0010] The front group of the rear fixed group comprises a fourth negative meniscus lens, a fifth positive lens and a fifth negative meniscus lens sequentially arranged along an optical path; the front group of the rear fixed group has a positive focal power.

[0011] The compensation group comprises a fourth negative lens, a sixth negative meniscus lens, a sixth positive lens, a seventh negative meniscus lens and a seventh positive lens sequentially arranged along an optical path; the compensation group has a positive focal power.

[0012] The rear group of the rear fixed group comprises a fifth negative lens and an eighth positive lens sequentially arranged along an optical path; the rear group of the rear fixed group has a negative focal power.

[0013] The filter is an afocal lens for realizing imaging switching of three modes of color, black and white and laser.

[0014] Further, in order to better correct the wide spectral chromatic aberration under long focal length, the first positive lens, the second positive lens and the first negative lens are made of FK95 optical glass.

[0015] Further, in order to better eliminate the wide spectral chromatic aberration caused by short focus, the refractive index of the third positive lens is greater than or equal to 1.7.

[0016] The Abbe number of the second negative lens is greater than or equal to 88.

[0017] Further, in order to correct off-axis higher-order aberrations under different focal lengths, and to play a role of field lens, compress the light exit height of the rear group of the rear fixed group, and further improve the compression ratio, the fourth negative meniscus lens and the fifth negative meniscus lens are made of heavy lanthanum glass.

[0018] The material of the fifth positive lens is FK glass.

[0019] Further, in order to realize the large dynamic range adjustment of the optical energy of the whole continuous zoom optical system, the diaphragm aperture adjustment range of the adjustable diaphragm is 0-15mm.

[0020] Further, the curvature radius values of the first negative meniscus lens, the first positive lens, the second positive lens, the first negative lens, the second negative meniscus lens, the third positive lens, the second negative lens, the third negative meniscus lens, the fourth positive lens, the third negative lens, the fourth negative meniscus lens, the fifth positive lens, the fifth negative meniscus lens, the fourth negative lens, the sixth negative meniscus lens, the sixth positive lens, the seventh negative meniscus lens, the seventh positive lens, the fifth negative lens, the eighth positive lens and the filter are 315.011, 104.295, 122.447, 78.624, 193.021, 32.635, -113.798, 163.686, 37.731, -38.634, 15.297, 18.445, -54.002, -189.094, -15.672, -1283.822, 139.460, 26.008, -16.866, -67.461 and ∞ respectively, and the curvature radius values close to the image side surface are 104.827, -451.176, 7041.290, 428.829, 29.198, -135.217, 40.583, 25.401, 398.589, 100.612, 13.231, -33.377, 24268.1, -35.684, -39.705, -24.773, 24.234, -36.108, 43.192, -16.881 and ∞ respectively, all of which are in millimeter;

[0021] Further, the center thickness values of the first negative meniscus lens, the first positive lens, the second positive lens, the first negative lens, the second negative meniscus lens, the third positive lens, the second negative lens, the third negative meniscus lens, the fourth positive lens, the third negative lens, the fourth negative meniscus lens, the fifth positive lens, the fifth negative meniscus lens, the fourth negative lens, the sixth negative meniscus lens, the sixth positive lens, the seventh negative meniscus lens, the seventh positive lens, the fifth negative lens, the eighth positive lens and the filter lens are 6.0, 13.8, 11.0, 11.0, 3.0, 9.0, 3.0, 2.0, 3.0, 2.0, 2.0, 4.5, 2.0, 3.0, 1.8, 3.5, 2.0, 4.2, 1.8, 2.5 and 2.0 respectively, all of which are in millimeter;

[0022] The thickness values of the air gaps between two adjacent ones of the first negative meniscus lens, the first positive lens, the second positive lens, the first negative lens, the second negative meniscus lens, the third positive lens, the second negative lens, the third negative meniscus lens, the fourth positive lens, the third negative lens, the fourth negative meniscus lens, the fifth positive lens, the fifth negative meniscus lens, the adjustable diaphragm, the fourth negative lens, the sixth negative meniscus lens, the sixth positive lens, the seventh negative meniscus lens, the seventh positive lens, the fifth negative lens, the eighth positive lens and the filter on the principal optical axis are 0.1, 0.3, 0.3, 4.0, 1.01, 0.684, 8.93, 1.129, 2.485, 77.84, 1.564, 0.226, 2.0, 23.455, 2.03, 3.803, 0.3, 0.3, 20.147, 3.243 and 4.506, respectively, and the units are millimeters;

[0023] The distance between the surface of the filter close to the image side and the image plane on the principal optical axis is 4.642 millimeters.

[0024] The present application has the following beneficial effects:

[0025] (1)The large magnification ratio, three-waveband, compact continuous zoom optical system comprises a front fixed group, a variable magnification group, a front group of a rear fixed group, an adjustable diaphragm, a compensation group, a rear group of the rear fixed group and a filter arranged in sequence along an optical path; the front fixed group is a positive lens group composed of four lenses in a four-separation configuration, used for focusing and correcting chromatic aberration in a wide spectral range under a long focal length; the variable magnification group comprises six lenses with a negative focal power and an absolute value of the focal power greater than or equal to 0.1, capable of realizing optical magnification compression in a large magnification ratio and eliminating chromatic aberration in a wide spectrum generated by the short focus; the compensation group comprises five lenses, used for compensating residual aberration generated by the variable magnification group and also playing a role in image stabilization compensation during zooming of the continuous zoom optical system; in the application, the traditional rear fixed group is split into the front group of the rear fixed group and the rear group of the rear fixed group, and the front group of the rear fixed group is arranged between the variable magnification group and the compensation group, the front group of the rear fixed group comprises three lenses with a positive focal power, used for improving the compression ratio of the continuous zoom optical system; the rear group of the rear fixed group is arranged between the compensation group and the filter, comprising two lenses with a negative focal power, mainly used for compensating off-axis chromatic aberration and high-order aberration of the long focus; therefore, the large magnification ratio, three-waveband, compact continuous zoom optical system is a new type of continuous zoom optical system based on a positive group compensation configuration in a mechanical compensation system, with simple mechanical structure, small system volume and weight, capable of realizing continuous zoom high-performance imaging with a spectral range of 0.4-1.1 μm, a focal length range of 16-520 mm, a variable magnification ratio of 32.5, a system focal length ratio of 2:1 and an F number of 3.6-5.8, and meeting the application requirements of new type of aerial photoelectric equipment; therefore, the application solves the technical problems of the existing continuous zoom optical systems with positive group compensation and negative group compensation, small variable magnification ratio and compression ratio and narrow spectral range, and the existing continuous zoom optical system with double-group linkage compensation, narrow spectral range, complex mechanical structure and large system volume and weight, which cannot meet the application requirements of new type of aerial photoelectric equipment; under the premise of ensuring high imaging quality, the large magnification ratio, three-waveband, compact continuous zoom optical system realizes compact optical path design with a large magnification ratio and a wide spectral range.

[0026] (2)The materials of the first positive lens, the second positive lens and the first negative lens in the front fixed group of the large magnification ratio, three-waveband, compact continuous zoom optical system are preferably FK95 optical glass, which can make the correction of chromatic aberration in a wide spectral range under a long focal length better.

[0027] (3) the zoom group in the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application changes the configuration of the traditional zoom group including only 3-4 lenses, increases the third positive lens and the second negative lens, and preferably the third positive lens is a high refractive index lens with a refractive index greater than or equal to 1.7, and the second negative lens is a large Abbe number lens with an Abbe number greater than or equal to 88, so that the effect of eliminating the wide spectrum chromatic aberration generated by the short focus is better.

[0028] (4) the front group of the rear fixed group in the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application is arranged between the zoom group and the compensation group, the optical power of the front group of the rear fixed group is positive, and the materials of the fourth negative meniscus lens and the fifth negative meniscus lens in the front group of the rear fixed group are preferably heavy lanthanum glass, and the material of the fifth positive lens is preferably FK glass, so that the off-axis higher-order aberration under different focal lengths can be better corrected, and the field lens can be used to compress the light exit height of the rear group of the rear fixed group, so that the compression ratio is further improved.

[0029] (5) the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application has three spectral bands of color, black and white, and laser, the color has high-definition imaging capability, the black and white has fog imaging capability, and the laser has spot monitoring imaging capability; and the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application has excellent imaging quality in different focal lengths and different spectral ranges, the distortion in different focal lengths is small, the maximum distortion is less than 1%, and stable imaging can be realized in the continuous zoom process, and the stable imaging precision is better than 0.01mm; therefore, the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application can not only be applied to the zoom television of the new generation of aviation photoelectric equipment, but also be popularized and applied to other compact photoelectric systems such as various aviation photoelectric pods, photoelectric turret and the like which need continuous zoom imaging. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the optical path diagram of the embodiment of the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application;

[0031] Figure 2 is the optical diagram of the embodiment of the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application at different focal lengths, wherein:

[0032] (A) is the optical diagram of the short focus 16mm;

[0033] (B) is the optical diagram of the medium focus 285mm;

[0034] (C) is the optical diagram of the long focus 520mm;

[0035] Figure 3 is the imaging quality diagram of the embodiment of the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application at different focal lengths and different spectral values, wherein:

[0036] (A1) is an imaging quality map of short focal length 16 mm, spectral value 0.486 μm ~ 0.656 μm;

[0037] (A2) is an imaging quality map of short focal length 16 mm, spectral value 0.7 μm ~ 0.9 μm;

[0038] (A3) is an imaging quality map of short focal length 16 mm, spectral value 1.064 μm;

[0039] (B1) is an imaging quality map of medium focal length 285 mm, spectral value 0.486 μm ~ 0.656 μm;

[0040] (B2) is an imaging quality map of medium focal length 285 mm, spectral value 0.7 μm ~ 0.9 μm;

[0041] (B3) is an imaging quality map of medium focal length 285 mm, spectral value 1.064 μm;

[0042] (C1) is an imaging quality map of long focal length 520 mm, spectral value 0.486 μm ~ 0.656 μm;

[0043] (C2) is an imaging quality map of long focal length 520 mm, spectral value 0.7 μm ~ 0.9 μm;

[0044] (C3) is an imaging quality map of long focal length 520 mm, spectral value 1.064 μm;

[0045] Figure 4 are the distortion maps of different focal lengths of the embodiment of the present application, which is a large zoom ratio, three-waveband, compact continuous zoom optical system, wherein:

[0046] (a) is a distortion map of short focal length 16 mm;

[0047] (b) is a distortion map of medium focal length 285 mm;

[0048] (c) is a distortion map of long focal length 520 mm.

[0049] The explanations of the various reference numerals in the figures are as follows:

[0050] 1 - front fixed group, 11 - first negative meniscus lens, 12 - first positive lens, 13 - second positive lens, 14 - first negative lens, 2 - zoom group, 21 - second negative meniscus lens, 22 - third positive lens, 23 - second negative lens, 24 - third negative meniscus lens, 25 - fourth positive lens, 26 - third negative lens, 3 - front group of rear fixed group, 31 - fourth negative meniscus lens, 32 - fifth positive lens, 33 - fifth negative meniscus lens, 4 - adjustable diaphragm, 5 - compensation group, 51 - fourth negative lens, 52 - sixth negative meniscus lens, 53 - sixth positive lens, 54 - seventh negative meniscus lens, 55 - seventh positive lens, 6 - rear group of rear fixed group, 61 - fifth negative lens, 62 - eighth positive lens, 7 - filter, 8 - image plane. DETAILED DESCRIPTION

[0051] The application will be described in detail below with reference to the drawings and specific embodiments.

[0052] Referring to Figure 1 The application is a large zoom ratio, three-waveband, compact continuous zoom optical system, which comprises a front fixed group 1, a zoom group 2, a front group of rear fixed group 3, an adjustable diaphragm 4, a compensation group 5, a rear group of rear fixed group 6 and a filter 7 arranged in sequence along an optical path. The large zoom ratio, three-waveband, compact continuous zoom optical system of the application adopts 21 optical elements, and none of the optical elements is a non-spherical optical element, and the details are as follows:

[0053] Referring to Figure 1 The above-mentioned front fixed group 1 is a positive lens group comprising a first negative meniscus lens 11, a first positive lens 12, a second positive lens 13 and a first negative lens 14 arranged in sequence along an optical path, and the four lenses adopt a four-separation type configuration; the above-mentioned zoom group 2 comprises a second negative meniscus lens 21, a third positive lens 22, a second negative lens 23, a third negative meniscus lens 24, a fourth positive lens 25 and a third negative lens 26 arranged in sequence along an optical path; the zoom group 2 has a negative focal power and the absolute value of the focal power is greater than or equal to 0.1; the above-mentioned front group of rear fixed group 3 comprises a fourth negative meniscus lens 31, a fifth positive lens 32 and a fifth negative meniscus lens 33 arranged in sequence along an optical path; the front group of rear fixed group 3 has a positive focal power; the above-mentioned compensation group 5 comprises a fourth negative lens 51, a sixth negative meniscus lens 52, a sixth positive lens 53, a seventh negative meniscus lens 54 and a seventh positive lens 55 arranged in sequence along an optical path; the compensation group 5 has a positive focal power; the above-mentioned rear group of rear fixed group 6 comprises a fifth negative lens 61 and an eighth positive lens 62 arranged in sequence along an optical path; the rear group of rear fixed group 6 has a negative focal power; and the above-mentioned filter 7 is a lens with no focal power, which is used to realize imaging switching of three modes of color, black and white and laser. Figure 1 The position indicated by reference numeral 8 is an image plane.

[0054] The front fixed group 1 is used for focusing and correcting chromatic aberration of wide spectrum under long focal length. In the embodiment, the materials of the first positive lens 12, the second positive lens 13 and the first negative lens 14 in the front fixed group 1 are all FK95 optical glass. The FK95 optical glass is introduced to make the effect of correcting chromatic aberration of wide spectrum under long focal length better.

[0055] The variable magnification group 2 is used for realizing large variable magnification ratio light path compression in optical variable magnification and eliminating wide spectrum chromatic aberration caused by short focus. In the application, the variable magnification group 2 changes the configuration of the traditional variable magnification group which only includes 3-4 lenses, increases the third positive lens 22 and the second negative lens 23, and preferably the refractive index of the third positive lens 22 is greater than or equal to 1.7, which is 1.9459 in the embodiment, and preferably the Abbe number of the second negative lens 23 is greater than or equal to 88, which is 94.5234 in the embodiment. In this way, the effect of eliminating wide spectrum chromatic aberration caused by short focus is better.

[0056] The compensation group 5 is used for compensating residual aberration caused by the variable magnification group, and also plays a role of image stabilization compensation in the variable focus process of the continuous zoom optical system.

[0057] In the application, the traditional rear fixed group is split into the rear fixed group front group 3 and the rear fixed group rear group 6, the rear fixed group front group 3 is arranged between the variable magnification group 2 and the compensation group 5 to improve the compression ratio of the continuous zoom optical system, and the rear fixed group rear group 6 is arranged between the compensation group 5 and the filter 7, which is mainly used for compensating off-axis chromatic aberration and high-order aberration of long focus. In the embodiment, the materials of the fourth negative meniscus lens 31 and the fifth negative meniscus lens 33 in the rear fixed group front group 3 are both preferably heavy lanthanum glass, and the material of the fifth positive lens 32 is preferably FK glass. In this way, the off-axis high-order aberration under different focal lengths can be better corrected, and the fifth positive lens 32 can also play a role of field lens to compress the light exit height of the rear fixed group rear group 6, so that the compression ratio is further improved.

[0058] The adjustable diaphragm 4 is arranged behind the fifth negative meniscus lens 33 which is the last lens of the rear fixed group front group 3. In order to realize large dynamic range adjustment of light energy of the whole continuous zoom optical system, the diaphragm aperture of the adjustable diaphragm 4 is preferably adjusted in the range of 0-15 mm.

[0059] The filter 7 is arranged at the end of the light path. By switching the filter 7, three modes of color, black and white and laser high-performance imaging switching are realized.

[0060] Table 1 is the optical system parameters of the embodiment of the application.

[0061] Table 1:

[0062]

[0063]

[0064]

[0065] In Table 1, among the two radius of curvature values corresponding to each lens and filter 7, the radius of curvature value in the upper row is the radius of curvature value of the surface close to the object side, and the radius of curvature value in the lower row is the radius of curvature value of the surface close to the image side; the thickness value corresponding to each lens and filter 7 in Table 1 is the central thickness value of the lens itself; the interval value corresponding to each lens and adjustable diaphragm 4 in Table 1 is the thickness value of the air gap on the main optical axis between the lens or adjustable diaphragm 4 adjacent to the image side; and the interval value corresponding to filter 7 in Table 1 is the distance on the main optical axis between the surface close to the image side of filter 7 and image plane 8.

[0066] The large-variation-ratio, three-waveband, compact continuous zoom optical system of the embodiment has a total optical path length of 255 mm and a long-focus focal length of 520 mm, and realizes a compression ratio of 2:1.

[0067] Figure 2 is an optical diagram of the short focus 16 mm of the large-variation-ratio, three-waveband, compact continuous zoom optical system embodiment of the application, (B) is an optical diagram of the medium focus 285 mm, and (C) is an optical diagram of the long focus 520 mm.

[0068] Figure 3 is an imaging quality diagram of the large-variation-ratio, three-waveband, compact continuous zoom optical system embodiment of the application at different focal lengths and different spectral values, wherein (A1) is an imaging quality diagram of the short focus 16 mm and the spectral value of 0.486 μm to 0.656 μm, (A2) is an imaging quality diagram of the short focus 16 mm and the spectral value of 0.7 μm to 0.9 μm, (A3) is an imaging quality diagram of the short focus 16 mm and the spectral value of 1.064 μm, (B1) is an imaging quality diagram of the medium focus 285 mm and the spectral value of 0.486 μm to 0.656 μm, (B2) is an imaging quality diagram of the medium focus 285 mm and the spectral value of 0.7 μm to 0.9 μm, (B3) is an imaging quality diagram of the medium focus 285 mm and the spectral value of 1.064 μm, (C1) is an imaging quality diagram of the long focus 520 mm and the spectral value of 0.486 μm to 0.656 μm, (C2) is an imaging quality diagram of the long focus 520 mm and the spectral value of 0.7 μm to 0.9 μm, and (C3) is an imaging quality diagram of the long focus 520 mm and the spectral value of 1.064 μm. Figure 3 It can be seen that the large-variation-ratio, three-waveband, compact continuous zoom optical system of the embodiment has excellent imaging quality at different focal lengths and different spectral values. It can be seen that the large-variation-ratio, three-waveband, compact continuous zoom optical system of the embodiment has excellent imaging quality at different focal lengths and different spectral values.

[0069] Figure 4 are different focal length distortion maps of a large zoom ratio, three-waveband, compact continuous zoom optical system embodiment of the present application, wherein: (a) is a short focal length 16mm distortion map; (b) is a middle focal length 285mm distortion map; (c) is a long focal length 520mm distortion map. From Figure 4 It can be seen that the large zoom ratio, three-waveband, compact continuous zoom optical system embodiment has a small distortion at different focal lengths, and the maximum distortion is less than 1%.

[0070] In summary, the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application not only realizes a large zoom ratio, large compression ratio, wide spectral range design of a compact optical path under the premise of ensuring high imaging quality, but also can realize stable imaging during continuous zooming, and the stable imaging precision is better than 0.01mm; therefore, the large zoom ratio, three-waveband, compact continuous zoom optical system of the present application can not only be applied to a new generation of aviation photoelectric equipment zoom television, but also can be popularized and applied to other types of aviation photoelectric pod, photoelectric turret and other compact photoelectric systems which need continuous zoom imaging.

Claims

1. A high zoom ratio, three-band, compact continuous zoom optical system, characterized in that: It includes a front fixed group (1), a zoom group (2), a rear fixed group front group (3), an adjustable aperture (4), a compensation group (5), a rear fixed group rear group (6), and a filter (7) arranged sequentially along the optical path; The front fixed group (1) is a positive lens group including a first negative meniscus lens (11), a first positive lens (12), a second positive lens (13) and a first negative lens (14) arranged sequentially along the optical path towards the object surface, and the four lenses adopt a four-separated configuration. The zoom group (2) includes a second negative meniscus lens (21), a third positive lens (22), a second negative lens (23), a third negative meniscus lens (24), a fourth positive lens (25), and a third negative lens (26) arranged sequentially along the optical path and curving towards the object surface; the optical power of the zoom group (2) is negative and the absolute value of the optical power is greater than or equal to 0.1; The front group (3) of the rear fixed group includes a fourth negative meniscus lens (31) bent toward the object plane, a fifth positive lens (32) and a fifth negative meniscus lens (33) bent toward the image plane arranged sequentially along the optical path; the optical power of the front group (3) of the rear fixed group is positive. The compensation group (5) includes a fourth negative lens (51), a sixth negative meniscus lens (52) bent toward the image plane, a sixth positive lens (53), a seventh negative meniscus lens (54) bent toward the object plane, and a seventh positive lens (55) arranged sequentially along the optical path; the optical power of the compensation group (5) is positive. The rear fixed group (6) includes a fifth negative lens (61) and an eighth positive lens (62) arranged sequentially along the optical path; the optical power of the rear fixed group (6) is negative. The filter (7) is a non-photomagnetic lens used to achieve imaging switching between color, black and white, and laser modes.

2. The high zoom ratio, three-band, compact continuous zoom optical system according to claim 1, characterized in that: The first positive lens (12), the second positive lens (13), and the first negative lens (14) are all made of FK95 optical glass.

3. The large zoom ratio, three-band, compact continuous zoom optical system according to claim 2, characterized in that: The refractive index of the third positive lens (22) is greater than or equal to 1.7; The Abbe number of the second negative lens (23) is greater than or equal to 88.

4. The large zoom ratio, three-band, compact continuous zoom optical system according to claim 3, characterized in that: The fourth negative meniscus lens (31) and the fifth negative meniscus lens (33) are both made of heavy lanthanum glass; The fifth positive lens (32) is made of FK glass.

5. The high zoom ratio, three-band, compact continuous zoom optical system according to claim 4, characterized in that: The aperture diameter of the adjustable aperture (4) can be adjusted from 0 to 15 mm.

6. The large zoom ratio, three-band, compact continuous zoom optical system according to claim 5, characterized in that: The radii of curvature of the first negative meniscus lens (11), the first positive lens (12), the second positive lens (13), the first negative lens (14), the second negative meniscus lens (21), the third positive lens (22), the second negative lens (23), the third negative meniscus lens (24), the fourth positive lens (25), the third negative lens (26), the fourth negative meniscus lens (31), the fifth positive lens (32), the fifth negative meniscus lens (33), the fourth negative lens (51), the sixth negative meniscus lens (52), the sixth positive lens (53), the seventh negative meniscus lens (54), the seventh positive lens (55), the fifth negative lens (61), the eighth positive lens (62), and the filter (7) near the object side surface are 315.011, 104.295, 122.447, 78.624, 193.021, 32.635, and -113.79, respectively. The values ​​8, 163.686, 37.731, -38.634, 15.297, 18.445, -54.002, -189.094, -15.672, -1283.822, 139.460, 26.008, -16.866, -67.461, and ∞, with curvature radii of curvature near the image-side surface of 104.827, -451.176, and 7041, respectively. 290, 428.829, 29.198, -135.217, 40.583, 25.401, 398.589, 100.612, 13.231, -33.377, 24268.1, -35.684, -39.705, -24.773, 24.234, -36.108, 43.192, -16.881, and ∞, all in millimeters; The first negative meniscus lens (11), the first positive lens (12), the second positive lens (13), the first negative lens (14), the second negative meniscus lens (21), the third positive lens (22), the second negative lens (23), the third negative meniscus lens (24), the fourth positive lens (25), the third negative lens (26), the fourth negative meniscus lens (31), the fifth positive lens (32), the fifth negative meniscus lens (33), the fourth negative lens (51), the sixth negative meniscus lens (52), the sixth The center thicknesses of the positive lens (53), the seventh negative meniscus lens (54), the seventh positive lens (55), the fifth negative lens (61), the eighth positive lens (62), and the filter (7) are 6.0, 13.8, 11.0, 11.0, 3.0, 9.0, 3.0, 2.0, 3.0, 2.0, 2.0, 4.5, 2.0, 3.0, 1.8, 3.5, 2.0, 4.2, 1.8, 2.5, and 2.0, respectively, all in millimeters. First negative meniscus lens (11), first positive lens (12), second positive lens (13), first negative lens (14), second negative meniscus lens (21), third positive lens (22), second negative lens (23), third negative meniscus lens (24), fourth positive lens (25), third negative lens (26), fourth negative meniscus lens (31), fifth positive lens (32), fifth negative meniscus lens (33), adjustable aperture (4), fourth negative lens (51), sixth negative meniscus lens (52), sixth positive lens (53), seventh negative meniscus lens The thicknesses of the air gaps between adjacent lenses (54), the seventh positive lens (55), the fifth negative lens (61), the eighth positive lens (62), and the filter (7) along the principal optical axis are 0.1, 0.3, 0.3, 4.0, 1.01, 0.684, 8.93, 1.129, 2.485, 77.84, 1.564, 0.226, 2.0, 23.455, 2.03, 3.803, 0.3, 0.3, 20.147, 3.243, and 4.506, respectively, all in millimeters. The distance between the surface of the filter (7) near the image side and the image plane (8) on the principal optical axis is 4.642 mm.

Images