Large-view-field visible light to near-infrared continuous zooming optical system

Abstract

The invention relates to a large-view-field continuous zooming optical system from visible light to a near-infrared band. The system is sequentially provided with a front fixing group with positive focal power, a zooming group with negative focal power, a compensation group with positive focal power, a rear fixing group with negative focal power and an image plane I in the light propagation direction; wherein the zoom group is composed of a meniscus lens with negative focal power and a doublet lens; and the compensation group consists of a meniscus lens with positive focal power, a meniscus lens with negative focal power and a doublet lens with positive focal power. According to the invention, two groups of doublet lenses in different forms are adopted, a negative lens in one group of doublet lenses is crown glass with low refractive index and high Abbe number, and a positive lens in one group of doublet lenses is flint glass with high refractive index and low Abbe number; and in the other group of glued lenses, the negative lens is flint glass with high refractive index and low Abbe number, the positive lens is crown glass with low refractive index and high Abbe number, and the two types of glued lenses effectively control high-order spherical aberration caused by a large view field, correct field curvature and suppress chromatic aberration caused by a wide spectral range.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical lens imaging, and particularly relates to a large field of view visible light to near-infrared continuous zoom optical system. Background Art

[0002] The field of optoelectronic detection is of extremely important significance in modern technology. It is not only the driving force for technological progress but also the key to the development of multiple high-tech fields. Due to its ability to continuously zoom, the zoom optical system can adapt to target detection at different distances, which not only improves the flexibility and efficiency of detection in the field of optoelectronic detection but also broadens the application scope of optoelectronic detection technology.

[0003] The visible light to near-infrared band covers a relatively wide spectral range. This wide spectral range enables the system to adapt to different lighting conditions, including sunlight, moonlight, and various artificial light sources. The optical system in the visible light to near-infrared band can achieve imaging at night or under low-light conditions, which is of great significance for the fields of reconnaissance and night navigation.

[0004] The detection range is of great significance for the field of optoelectronic detection. A large detection range can significantly improve the detection efficiency, and the detection range is closely related to the field of view angle of the optical system. The field of view angle of existing visible light to near-infrared continuous zoom optical systems does not exceed 70°. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a large field of view visible light to near-infrared continuous zoom optical system. This system covers the visible light to near-infrared band, realizes all-weather detection while achieving large field of view detection, and achieves the purpose of improving efficiency.

[0006] To solve the above technical problems, the large field of view visible light to near-infrared band continuous zoom optical system of the present invention is sequentially provided with a front fixed group with positive optical power, a variable magnification group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and an image plane I along the light propagation direction; the front fixed group consists of three lenses, which are a meniscus lens L11 with negative optical power, a meniscus lens L12 with positive optical power, and a meniscus lens L13 with positive optical power from left to right in sequence. The convex surfaces of the three meniscus lenses face the object side; the variable magnification group consists of two lenses, which are a meniscus lens L21 with negative optical power and a negative doublet lens L22 from left to right in sequence; the convex surface of the meniscus lens L21 faces the object side; the doublet lens L22 is composed of a biconcave lens L221 and a meniscus lens L222 with positive optical power glued together, and the convex surface of the meniscus lens L222 faces the object side; the compensation group consists of three lenses, which are a meniscus lens L31 with positive optical power, a meniscus lens L32 with negative optical power, and a positive doublet lens L33 from left to right in sequence; the doublet lens L33 is composed of a biconvex lens L331 and a meniscus lens L332 with negative optical power glued together, and the convex surface of the meniscus lens L332 faces the image side; the rear fixed group consists of two lenses, which are a meniscus lens L41 with negative optical power and a biconvex lens L42 with positive optical power from left to right in sequence; the surfaces of all lenses are spherical surfaces; when the system changes from the short focal state to the long focal state, the variable magnification group and the compensation group move towards each other.

[0007] The doublet lens L22 is composed of a biconcave lens L221 and a meniscus lens L222 with positive optical power glued together, and the convex surface of the meniscus lens L222 faces the object side; the doublet lens L33 is composed of a biconvex lens L331 and a meniscus lens L332 with negative optical power glued together, and the convex surface of the meniscus lens L332 faces the image side.

[0008] The material of the meniscus lens L11 is H-ZF7LA; the material of the meniscus lens L12 is H-ZPK5; the material of the meniscus lens L13 is H-ZPK5; the material of the meniscus lens L21 is H-LAF55; the material of the biconcave lens L221 is CAF2; the material of the meniscus lens L222 is H-ZF73; the material of the meniscus lens L31 is H-ZPK7; the material of the meniscus lens L32 is H-FK95N; the material of the biconvex lens L331 is H-FK71; the material of the meniscus lens L332 is H-ZLAF76A; the material of the meniscus lens L41 is H-K9L; the material of the biconvex lens L42 is H-LAK53A.

[0009] The front and rear surface curvature radii of the meniscus lens L11 are 49.918 mm to 50.610 mm and 33.223 mm to 33.429 mm respectively; the front and rear surface curvature radii of the meniscus lens L12 are 34.128 mm to 34.477 mm and 138.445 mm to 142.933 mm respectively; the front and rear surface curvature radii of the meniscus lens L13 are 32.356 mm to 35.065 mm and 82.365 mm to 92.336 mm respectively; the front and rear surface curvature radii of the meniscus lens L21 are 47.410 mm to 52.587 mm and 9.654 mm to 9.684 mm respectively; the front surface curvature radius of the doublet lens L22 is -27.305 mm to -25.848 mm, the curvature radius of the cemented surface is 14.800 mm to 15.973 mm, and the rear surface curvature radius is 25.565 mm to 29.016 mm; the front and rear surface curvature radii of the meniscus lens L31 are 11.083 mm to 11.323 mm and 66.602 mm to 73.190 mm respectively; the front and rear surface curvature radii of the meniscus lens L32 are 5.058 mm to 5.393 mm and 4.646 mm to 4.999 mm respectively; the front surface curvature radius of the doublet lens L33 is 11.621 mm to 13.065 mm, the curvature radius of the cemented surface is -5.786 mm to -5.735 mm, and the rear surface curvature radius is -12.381 mm to -12.183 mm; the front and rear surface curvature radii of the meniscus lens L41 are -10.686 mm to -10.107 mm and 20.215 mm to 27.588 mm respectively; the front and rear surface curvature radii of the biconvex lens L42 are 28.671 mm to 36.694 mm and -21.407 mm to -17.817 mm respectively.

[0010] The thickness of the meniscus lens L11 is 2.8 mm to 3 mm; the thickness of the meniscus lens L12 is 8 mm to 8.2 mm; the thickness of the meniscus lens L13 is 4.6 mm to 4.75 mm; the thickness of the meniscus lens L21 is 1 mm to 1.2 mm; the thickness of the biconcave lens L221 is 0.8 mm to 1 mm, and the thickness of the meniscus lens L222 is 1.4 mm to 1.8 mm; the thickness of the meniscus lens L31 is 1.8 mm to 2 mm; the thickness of the meniscus lens L32 is 1.5 mm to 1.6 mm; the thickness of the biconvex lens L331 is 1.8 mm to 2 mm, and the thickness of the meniscus lens L332 is 0.8 mm to 1 mm; the thickness of the meniscus lens L41 is 1 mm to 1.1 mm; the thickness of the biconvex lens L42 is 1.4 mm to 1.5 mm.

[0011] The air gap between the meniscus lens L11 and the meniscus lens L12 is 0.33 mm to 1.19 mm; the air gap between the meniscus lens L12 and the meniscus lens L13 is 0.3 mm to 0.5 mm; the air gap between the meniscus lens L13 and the meniscus lens L21 is 0.01 mm to 24.55 mm; the air gap between the meniscus lens L21 and the doublet lens L22 is 8.1 mm to 8.86 mm; the air gap between the doublet lens L22 and the meniscus lens L31 is 33.55 mm to 0.39 mm; the air gap between the meniscus lens L31 and the meniscus lens L32 is 0.2 mm to 0.3 mm; the air gap between the meniscus lens L32 and the doublet lens L33 is 2.97 mm to 3.22 mm; the air gap between the doublet lens L33 and the meniscus lens L41 is 2.73 mm to 12.59 mm; the air gap between the meniscus lens L41 and the biconvex lens L42 is 2.26 mm to 3.37 mm.

[0012] The aperture stop of the optical system is arranged on the front surface of the meniscus lens L31.

[0013] The continuous zoom range of the optical system is 7 to 50 mm; the detection band is 450 nm to 850 nm, the field of view angle is 78.5° to 11.7°, and the F number is variable from 4.7 to 6.8.

[0014] Based on the above technical solutions, the advantages and beneficial effects of the present invention are as follows:

[0015] The present invention adopts two groups of doublets with different forms. In one group of doublets, the negative lens is crown glass with low refractive index and high Abbe number, and the positive lens is flint glass with high refractive index and low Abbe number; in the other group of doublets, the negative lens is flint glass with high refractive index and low Abbe number, and the positive lens is crown glass with low refractive index and high Abbe number. These two types of doublets effectively control the high-order spherical aberration caused by the large field of view, correct the field curvature, and suppress the chromatic aberration caused by the wide spectral range.

[0016] The present invention adopts materials such as CaF2, H-FK series and H-ZP series, which have low dispersion, can well correct the secondary spectrum and suppress the chromatic aberration of the system, and at the same time optimize the spherical aberration caused by the large field of view.

[0017] The aperture stop of the present invention is arranged on the front surface of the first lens of the compensation group, and there is no need to make a separate mechanical aperture stop, so the structure is simple. During the zooming process of the optical system, the aperture size of the system remains unchanged, and the F number changes, so that the uniformity of the relative illuminance of the image plane at all focal lengths of the system is greater than 93%.

[0018] The present invention adopts a mechanical compensation method with two components (a variable magnification group and a compensation group). The variable magnification group and the compensation group move towards each other during the zooming process, featuring a simple structure, easy balance of the system's aberrations, and stable image plane position.

[0019] The present invention has a large field of view, with a wavelength band covering visible light to near-infrared. It has clear and stable imaging within the zoom range, can achieve all-weather surveillance, greatly improve the detection efficiency, and achieve a quick response in case of emergencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0021] Figure 1 FIG. is a schematic structural diagram of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at short focal length.

[0022] Figure 2 FIG. is a schematic structural diagram of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at long focal length.

[0023] Figure 3 FIG. is the modulation transfer function graph of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at short focal length in Example 1 under the condition of normal temperature 20°C.

[0024] Figure 4 FIG. is the modulation transfer function graph of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at long focal length in Example 1 under the condition of normal temperature 20°C.

[0025] Figure 5 FIG. is the relative illumination graph of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at short focal length in Example 1.

[0026] Figure 6 FIG. is the relative illumination graph of the large field of view visible light to near-infrared band continuous zoom optical system of the present invention at long focal length in Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0028] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0030] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "left", and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] The present invention will be further described below with reference to the drawings and embodiments.

[0032] As Figure 1 shown and Figure 2As shown in the figure, the large field of view visible light to near-infrared band continuous zoom optical system of the present invention is sequentially provided with a front fixed group with positive optical power, a variable magnification group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and an image plane I along the light propagation direction; the front fixed group is composed of three lenses, which are a meniscus lens L11 with negative optical power, a meniscus lens L12 with positive optical power, and a meniscus lens L13 with positive optical power from left to right in sequence. The convex surfaces of the three meniscus lenses face the object side; the variable magnification group is composed of two lenses, which are a meniscus lens L21 with negative optical power and a negative doublet lens L22 from left to right in sequence; the convex surface of the meniscus lens L21 faces the object side; the doublet lens L22 is composed of a biconcave lens L221 and a meniscus lens L222 with positive optical power glued together. The convex surface of the meniscus lens L222 faces the object side; the compensation group is composed of three lenses, which are a meniscus lens L31 with positive optical power, a meniscus lens L32 with negative optical power, and a positive doublet lens L33 from left to right in sequence; the doublet lens L33 is composed of a biconvex lens L331 and a meniscus lens L332 with negative optical power glued together. The convex surface of the meniscus lens L332 faces the image side; the rear fixed group is composed of two lenses, which are a meniscus lens L41 with negative optical power and a biconvex lens L42 with positive optical power from left to right in sequence. The surfaces of the respective lenses are all spherical surfaces.

[0033] The thickness of the meniscus lens L11 is 2.8 mm to 3 mm, the curvature radius of the front surface is 49.918 mm to 50.610 mm, the curvature radius of the rear surface is 33.223 mm to 33.429 mm, and the material is H-ZF7LA.

[0034] The thickness of the meniscus lens L12 is 8 mm to 8.2 mm, the curvature radius of the front surface is 34.128 mm to 34.477 mm, the curvature radius of the rear surface is 138.445 mm to 142.933 mm, and the material is H-ZPK5.

[0035] The thickness of the meniscus lens L13 is 4.6 mm to 4.75 mm, the curvature radius of the front surface is 32.356 mm to 35.065 mm, the curvature radius of the rear surface is 82.365 mm to 92.336 mm, and the material is H-ZPK5.

[0036] The thickness of the meniscus lens L21 is 1 mm to 1.2 mm, the curvature radius of the front surface is 47.410 mm to 52.587 mm, the curvature radius of the rear surface is 9.654 mm to 9.684 mm, and the material is H-LAF55.

[0037] The radius of curvature of the front surface of the double cemented lens L22 is -27.305 mm to -25.848 mm, the radius of curvature of the cemented surface is 14.800 mm to 15.973 mm, and the radius of curvature of the rear surface is 25.565 mm to 29.016 mm; among them, the thickness of the double concave lens L221 is 0.8 mm to 1 mm, and the material is CAF2; the thickness of the meniscus lens L222 is 1.4 mm to 1.8 mm, and the material is H-ZF73.

[0038] The thickness of the meniscus lens L31 is 1.8 mm to 2 mm, the radius of curvature of the front surface is 11.083 mm to 11.323 mm, the radius of curvature of the rear surface is 66.602 mm to 73.190 mm, and the material is H-ZPK7; further, the aperture stop of the system is arranged on the front surface of the meniscus lens L31.

[0039] The thickness of the meniscus lens L32 is 1.5 mm to 1.6 mm, the radius of curvature of the front surface is 5.058 mm to 5.393 mm, the radius of curvature of the rear surface is 4.646 mm to 4.999 mm, and the material is H-FK95N.

[0040] The radius of curvature of the front surface of the double cemented lens L33 is 11.621 mm to 13.065 mm, the radius of curvature of the cemented surface is -5.786 mm to -5.735 mm, and the radius of curvature of the rear surface is -12.381 mm to -12.183 mm; the thickness of the double convex lens L331 is 1.8 mm to 2 mm, and the material is H-FK71; the thickness of the meniscus lens L332 is 0.8 mm to 1 mm, and the material is H-ZLAF76A.

[0041] The thickness of the meniscus lens L41 is 1 mm to 1.1 mm, the radius of curvature of the front surface is -10.686 mm to -10.107 mm, the radius of curvature of the rear surface is 20.215 mm to 27.588 mm, and the material is H-K9L.

[0042] The thickness of the double convex lens L42 is 1.4 mm to 1.5 mm, the radius of curvature of the front surface is 28.671 mm to 36.694 mm, the radius of curvature of the rear surface is -21.407 mm to -17.817 mm, and the material is H-LAK53A.

[0043] All lenses are made of glass materials.

[0044] When the large field of view visible light to near-infrared band continuous zoom optical system changes from the short focal state to the long focal state, the varifocal group and the compensation group move towards each other.

[0045] The present invention adopts two groups of doublet lenses with different forms, effectively controlling the high-order spherical aberration caused by a large field of view, correcting the field curvature, and suppressing the chromatic aberration brought about by a wide spectral range; adopting materials such as CaF2, H-FK series, and H-ZP series, which have low dispersion, can well correct the secondary spectrum and suppress the chromatic aberration of the system, and at the same time optimize the spherical aberration brought about by a large field of view; the aperture stop is set on the front surface of the first lens of the compensation group, eliminating the need for an additional mechanical aperture stop, with a simple structure. During the zooming process of the optical system, the aperture size of the system remains unchanged while the F-number changes, making the uniformity of the relative illuminance of the image plane at all focal lengths of the system greater than 93%; adopting a mechanical compensation method with two components (the zoom group and the compensation group), the zoom group and the compensation group move towards each other during the zooming process, with a simple structure, and the aberrations of the system are also easily balanced, and the image plane position is stable.

[0046] Example 1

[0047] The parameters (radius of curvature, thickness, spacing, material, etc.) of each optical element in Example 1 are shown in Table 1.

[0048] Table 1

[0049]

[0050]

[0051] The above Example 1 can achieve the following indicators:

[0052] a) Focal length: 7 - 50 mm;

[0053] b) F / #: 4.7 - 6.8;

[0054] c) Band: 450 - 850 nm;

[0055] d) MTF: Full field of view > 0.18 @ 93 lp / mm;

[0056] e) Relative illuminance: > 93%

[0057] Example 2

[0058] The parameters (radius of curvature, thickness, spacing, material, etc.) of each optical element in Example 2 are shown in Table 2.

[0059] Table 2

[0060]

[0061]

[0062] The above Example 2 can achieve the following indicators:

[0063] a) Focal length: 7 - 50 mm;

[0064] b) F / #: 4.7 to 6.8;

[0065] c) Band: 450 to 850 nm;

[0066] d) MTF: > 0.18 @ 93 mm / lp for full field of view;

[0067] e) Relative illuminance: > 93%

[0068] The above embodiments only illustrate several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A continuous zoom optical system from visible light to near-infrared band with a large field of view, characterized in that The system is successively provided with a front fixed group with positive optical power, a variable magnification group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and an image plane I along the light propagation direction; the front fixed group consists of three lenses, which are a meniscus lens L11 with negative optical power, a meniscus lens L12 with positive optical power, and a meniscus lens L13 with positive optical power from left to right. The convex surfaces of the three meniscus lenses face the object side; the variable magnification group consists of two lenses, which are a meniscus lens L21 with negative optical power and a doublet lens L22 with negative optical power from left to right; the convex surface of the meniscus lens L21 faces the object side; the doublet lens L22 is composed of a biconcave lens L221 and a meniscus lens L222 with positive optical power glued together, and the convex surface of the meniscus lens L222 faces the object side; the compensation group consists of three lenses, which are a meniscus lens L31 with positive optical power, a meniscus lens L32 with negative optical power, and a doublet lens L33 with positive optical power from left to right; the doublet lens L33 is composed of a biconvex lens L331 and a meniscus lens L332 with negative optical power glued together, and the convex surface of the meniscus lens L332 faces the image side; the rear fixed group consists of two lenses, which are a meniscus lens L41 with negative optical power and a biconvex lens L42 with positive optical power from left to right; the surfaces of all lenses are spherical surfaces; When the system changes from the short focal state to the long focal state, the variable magnification group and the compensation group move towards each other.

2. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 1, characterized in that The doublet lens L22 is composed of a biconcave lens L221 and a meniscus lens L222 with positive optical power glued together, and the convex surface of the meniscus lens L222 faces the object side; the doublet lens L33 is composed of a biconvex lens L331 and a meniscus lens L332 with negative optical power glued together, and the convex surface of the meniscus lens L332 faces the image side.

3. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 2, wherein The material of the meniscus lens L11 is H-ZF7LA; the material of the meniscus lens L12 is H-ZPK5; the material of the meniscus lens L13 is H-ZPK5; the material of the meniscus lens L21 is H-LAF55; the material of the biconcave lens L221 is CAF2; the material of the meniscus lens L222 is H-ZF73; the material of the meniscus lens L31 is H-ZPK7; the material of the meniscus lens L32 is H-FK95N; the material of the biconvex lens L331 is H-FK71; the material of the meniscus lens L332 is H-ZLAF76A; the material of the meniscus lens L41 is H-K9L; the material of the biconvex lens L42 is H-LAK53A.

4. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 2, characterized in that The front and rear surface curvature radii of the meniscus lens L11 are 49.918mm to 50.610mm, 33.223 mm to 33.429 mm; the front and rear surface curvature radii of the meniscus lens L12 are 34.128 mm to 34.477 mm and 138.445 mm to 142.933 mm respectively; the front and rear surface curvature radii of the meniscus lens L13 are 32.356 mm to 35.065 mm and 82.365 mm to 92.336 mm respectively; the front and rear surface curvature radii of the meniscus lens L21 are 47.410 mm to 52.587 mm and 9.654 mm to 9.684 mm respectively; the front surface curvature radius of the doublet lens L22 is -27.305 mm to -25.848 mm, the curvature radius of the cemented surface is 14.800 mm to 15.973 mm, and the rear surface curvature radius is 25.565 mm to 29.016 mm; the front and rear surface curvature radii of the meniscus lens L31 are 11.083 mm to 11.323 mm and 66.602 mm to 73.190 mm respectively; the front and rear surface curvature radii of the meniscus lens L32 are 5.058 mm to 5.393 mm and 4.646 mm to 4.999 mm respectively; the front surface curvature radius of the doublet lens L33 is 11.621 mm to 13.065 mm, the curvature radius of the cemented surface is -5.786 mm to -5.735 mm, and the rear surface curvature radius is -12.381 mm to -12.183 mm; the front and rear surface curvature radii of the meniscus lens L41 are -10.686 mm to -10.107 mm and 20.215 mm to 27.588 mm respectively; the front and rear surface curvature radii of the biconvex lens L42 are 28.671 mm to 36.694 mm and -21.407 mm to -17.817 mm respectively.

5. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 2, wherein The thickness of the meniscus lens L11 is 2.8 mm to 3 mm; the thickness of the meniscus lens L12 is 8 mm to 8.2 mm; the thickness of the meniscus lens L13 is 4.6 mm to 4.75 mm; the thickness of the meniscus lens L21 is 1 mm to 1.2 mm; the thickness of the biconcave lens L221 is 0.8 mm to 1 mm, and the thickness of the meniscus lens L222 is 1.4 mm to 1.8 mm; the thickness of the meniscus lens L31 is 1.8 mm to 2 mm; the thickness of the meniscus lens L32 is 1.5 mm to 1.6 mm; the thickness of the biconvex lens L331 is 1.8 mm to 2 mm, and the thickness of the meniscus lens L332 is 0.8 mm to 1 mm; the thickness of the meniscus lens L41 is 1 mm to 1.1 mm; the thickness of the biconvex lens L42 is 1.4 mm to 1.5 mm.

6. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 1, characterized in that The air gap between the meniscus lens L11 and the meniscus lens L12 is 0.33 mm to 1.19 mm; the air gap between the meniscus lens L12 and the meniscus lens L13 is 0.3 mm to 0.5 mm; the air gap between the meniscus lens L13 and the meniscus lens L21 is 0.01 mm to 24.55 mm; the air gap between the meniscus lens L21 and the doublet lens L22 is 8.1 mm to 8.86 mm; the air gap between the doublet lens L22 and the meniscus lens L31 is 33.55 mm to 0.39 mm; the air gap between the meniscus lens L31 and the meniscus lens L32 is 0.2 mm to 0.3 mm; the air gap between the meniscus lens L32 and the doublet lens L33 is 2.97 mm to 3.22 mm; the air gap between the doublet lens L33 and the meniscus lens L41 is 2.73 mm to 12.59 mm; the air gap between the meniscus lens L41 and the biconvex lens L42 is 2.26 mm to 3.37 mm.

7. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 1, characterized in that The aperture stop of this system is set on the front surface of the meniscus lens L31.

8. The continuous zoom optical system from visible light to near-infrared band with a large field of view according to claim 1, characterized in that The continuous zoom range of this system is 7 to 50 mm; the detection band is 450 nm to 850 nm, the field of view angle is 78.5° to 11.7°, and the F-number is variable from 4.7 to 6.8.

Images