A wide field-of-view continuous zoom optical system from visible light to near infrared

Abstract

This invention relates to a large field-of-view continuous zoom optical system from visible light to near-infrared bands. The system comprises, along the light propagation direction, a front fixed group with positive optical power, a zoom group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and image plane I. The zoom group consists of a meniscus lens with negative optical power and a cemented doublet lens; the compensation group consists of a meniscus lens with positive optical power, a meniscus lens with negative optical power, and a cemented doublet lens with positive optical power. This invention employs two sets of cemented doublet lenses of different types. In one set, the negative lens is made of crown glass with low refractive index and high Abbe number, and the positive lens is made of flint glass with high refractive index and low Abbe number. In the other set, the negative lens is made of flint glass with high refractive index and low Abbe number, and the positive lens is made of crown glass with low refractive index and high Abbe number. These two types of cemented doublet lenses effectively control higher-order spherical aberrations caused by the large field of view, correct field curvature, and suppress chromatic aberration caused by a wide spectral range.

Description

Technical Field

[0001] This invention belongs to the field of optical lens imaging technology, and particularly relates to a large field-of-view continuous zoom optical system from visible light to near infrared. Background Technology

[0002] The field of photoelectric detection holds immense importance in modern technology. It is not only a driving force for technological progress but also a key to the development of numerous high-tech fields. Zoom optical systems, with their continuous zoom capability, can adapt to target detection at varying distances. In the field of photoelectric detection, this not only improves the flexibility and efficiency of detection but also broadens the application scope of photoelectric detection technology.

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

[0004] Detection range is of great significance in the field of photoelectric detection. A larger detection range can significantly improve detection efficiency, and the detection range is closely related to the field of view of the optical system. Currently, no existing visible-to-near-infrared continuous zoom optical system has a field of view exceeding 70°. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a large field-of-view continuous zoom optical system from visible light to near infrared. The system covers the wavelength range from visible light to near infrared, achieving all-weather detection while realizing large field-of-view detection, thereby improving efficiency.

[0006] To solve the above-mentioned technical problems, the large field-of-view continuous zoom optical system of the present invention is provided with, along the light propagation direction, a front fixed group with positive optical power, a zoom 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. The front fixed group consists of three lenses, from left to right: 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. The convex surfaces of the three meniscus lenses all face the object side. The zoom group consists of two lenses. The system consists of, from left to right, a meniscus lens L21 with negative optical power and a cemented doublet lens L22 with negative optical power; the convex surface of the meniscus lens L21 faces the object side; the cemented doublet lens L22 is formed by cementing a biconcave lens L221 and a meniscus lens L222 with positive optical power together, with the convex surface of the meniscus lens L222 facing the object side; the compensation group consists of three lenses, from left to right, a meniscus lens L31 with positive optical power, a meniscus lens L32 with negative optical power, and a cemented doublet lens L33 with positive optical power; the cemented doublet lens L... 33 is composed of a biconvex lens L331 and a negative optical power meniscus lens L332 cemented together, with the convex surface of the meniscus lens L332 facing the image side; the rear fixed group consists of two lenses, from left to right: a negative optical power meniscus lens L41 and a positive optical power biconvex lens L42; the surface of each lens is spherical; when the system changes from a short focal length state to a long focal length state, the zoom group and the compensation group move towards each other.

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

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

[0009] The front and rear surface radii of curvature of the meniscus lens L11 are 49.918mm–50.610mm and 33.223mm–33.429mm, respectively; the front and rear surface radii of curvature of the meniscus lens L12 are 34.128mm–34.477mm and 138.445mm–142.933mm, respectively; and the front and rear surface radii of curvature of the meniscus lens L13 are 32.356mm–35.065mm and 82. The front and rear surface radii of curvature of the meniscus lens L21 are 47.410mm to 52.587mm and 9.654mm to 9.684mm, respectively; the front surface radius of curvature of the cemented doublet lens L22 is -27.305mm to -25.848mm, the cemented surface radius of curvature is 14.800mm to 15.973mm, and the rear surface radius of curvature is 25.565mm to 29.016mm. (The dimensions of the lenses are listed below, but the provided text is incomplete and cannot be accurately translated.) The radii of curvature of the front and rear surfaces of the meniscus lens L31 are 11.083mm–11.323mm and 66.602mm–73.190mm, respectively; the radii of curvature of the front and rear surfaces of the meniscus lens L32 are 5.058mm–5.393mm and 4.646mm–4.999mm, respectively; the radius of curvature of the front surface of the cemented doublet lens L33 is 11.621mm–13.065mm, and the radius of curvature of the cemented surface is -5.78. The front and rear surface radii of curvature of the L41 meniscus lens are -10.686mm to -10.107mm and 20.215mm to 27.588mm, respectively; the front and rear surface radii of curvature of the L42 biconvex lens are 28.671mm to 36.694mm and -21.407mm to -17.817mm, respectively.

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

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

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

[0013] The optical system has a continuous zoom range of 7–50 mm; a detection band of 450 nm–850 nm; a field of view of 78.5°–11.7°; and an F-number that is variable from 4.7 to 6.8.

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

[0015] This invention employs two sets of cemented doublets of different types. In one set, the negative lens is made of crown glass with a low refractive index and a high Abbe number, while the positive lens is made of flint glass with a high refractive index and a low Abbe number. In the other set, the negative lens is made of flint glass with a high refractive index and a low Abbe number, while the positive lens is made of crown glass with a low refractive index and a high Abbe number. These two types of cemented doublets effectively control higher-order spherical aberrations caused by a large field of view, correct field curvature, and suppress chromatic aberration caused by a wide spectral range.

[0016] This invention uses CAF2, H-FK series and H-ZP series materials, which have low dispersion and can effectively correct the chromatic aberration of the secondary spectral suppression system, while optimizing the spherical aberration caused by the large field of view.

[0017] The aperture of this invention is located on the front surface of the first lens element of the compensation group, eliminating the need for a separate mechanical aperture and simplifying the structure. During the zooming process of the optical system, the aperture size remains constant while the F-number changes, ensuring that the uniformity of relative illumination on the image plane at all focal length positions is greater than 93%.

[0018] This invention employs a two-component (magnification group and compensation group) mechanical compensation method. The magnification group and compensation group move towards each other during the zoom process, resulting in a simple structure and easy balance of aberrations in the system, as well as stable image plane position.

[0019] This invention features a large field of view, covering the wavelength range from visible light to near-infrared. It provides clear and stable imaging within the zoom range, enabling all-weather monitoring while significantly improving detection efficiency and facilitating rapid response in emergency situations. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

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

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

[0023] Figure 3 This is the transfer function diagram of the large field-of-view continuous zoom optical system from visible light to near-infrared band of the present invention at a short focal length under normal temperature (20°C) conditions.

[0024] Figure 4 This is the transfer function diagram of the long focal length of the large field-of-view continuous zoom optical system from visible light to near infrared band of the present invention at a normal temperature of 20°C in Embodiment 1.

[0025] Figure 5 This is a relative illumination diagram at a short focal length for Embodiment 1 of the large field-of-view continuous zoom optical system from visible light to near-infrared band of the present invention.

[0026] Figure 6 This is a relative illumination diagram at long focal length for Embodiment 1 of the large field-of-view continuous zoom optical system from visible light to near infrared band of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

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

[0032] like Figure 1 As shown and Figure 2As shown, the large field-of-view continuous zoom optical system of the present invention, in the visible to near-infrared band, is arranged sequentially along the light propagation direction as a front fixed group with positive optical power, a zoom group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and image plane I; the front fixed group consists of three lenses, from left to right: 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, all three meniscus lenses having their convex surfaces facing the object side; the zoom group consists of two lenses. From left to right, the lenses are a meniscus lens L21 with negative optical power and a cemented doublet lens L22 with negative optical power; the convex surface of the meniscus lens L21 faces the object side; the cemented doublet lens L22 is formed by cementing a biconcave lens L221 and a meniscus lens L222 with positive optical power together, with the convex surface of the meniscus lens L222 facing the object side; the compensation group consists of three lenses, from left to right: a meniscus lens L31 with positive optical power, a meniscus lens L32 with negative optical power, and a cemented doublet lens L33 with positive optical power; the cemented doublet lens L33 is formed by cementing a biconvex lens L331 and a meniscus lens L332 with negative optical power together, with the convex surface of the meniscus lens L332 facing the image side; the rear fixing group consists of two lenses, from left to right: a meniscus lens L41 with negative optical power and a biconvex lens L42 with positive optical power. All lenses have spherical surfaces.

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

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

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

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

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

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

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

[0040] The radius of curvature of the front surface of the cemented doublet 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 biconvex 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 meniscus lens L41 has a thickness of 1mm to 1.1mm, a front surface radius of curvature of -10.686mm to -10.107mm, a rear surface radius of curvature of 20.215mm to 27.588mm, and is made of H-K9L material.

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

[0043] All lenses are made of glass.

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

[0045] This invention employs two sets of cemented doublets of different types to effectively control higher-order spherical aberrations caused by a large field of view, correct field curvature, and suppress chromatic aberrations caused by a wide spectral range. It utilizes CAF2, H-FK series, and H-ZP series materials, which have low dispersion and can effectively correct chromatic aberrations in the second-order spectral suppression system while optimizing spherical aberrations caused by a large field of view. The aperture stop is located on the front surface of the first lens of the compensation group, eliminating the need for a separate mechanical aperture stop and simplifying the structure. During zooming, the aperture size of the optical system remains constant while the F-number changes, ensuring that the uniformity of relative illumination on the image plane at all focal length positions is greater than 93%. A two-element (zoom group and compensation group) mechanical compensation method is used, with the zoom group and compensation group moving towards each other during zooming. This simple structure facilitates aberration balance and ensures stable image plane positions.

[0046] Example 1

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

[0048] Table 1

[0049]

[0050]

[0051] The above-described 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@93mm / lp;

[0056] e) Relative illumination: >93%

[0057] Example 2

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

[0059] Table 2

[0060]

[0061]

[0062] The above-described embodiment 2 can achieve the following indicators:

[0063] a) Focal length: 7–50 mm;

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

[0065] c) Band: 450–850 nm;

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

[0067] e) Relative illumination: >93%

[0068] The above embodiments only illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A wide field-of-view continuous zoom optical system from visible light to near-infrared band, characterized in that... The system consists of a front fixed group with positive optical power, a zoom group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and image plane I, arranged sequentially along the light propagation direction. The front fixed group comprises three lenses: from left to right, 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; the convex surfaces of all three meniscus lenses face the object side. The zoom group comprises two lenses: from left to right, a meniscus lens L21 with negative optical power and a cemented doublet lens L22 with negative optical power; the convex surface of the meniscus lens L21 faces the object side. The cemented doublet lens L22 is formed by cementing a biconcave lens L221 and a meniscus lens L222 with positive optical power together; the convex surface of the meniscus lens L222 faces the object side. The compensation group consists of three lenses, from left to right: a positive power meniscus lens L31, a negative power meniscus lens L32, and a positive power cemented doublet lens L33. The cemented doublet lens L33 is formed by cementing a biconvex lens L331 and a negative power meniscus lens L332 together, with the convex surface of the meniscus lens L332 facing the image side. The rear fixing group consists of two lenses, from left to right: a negative power meniscus lens L41 and a positive power biconvex lens L42. All lens surfaces are spherical. When the system changes from a short focal length to a long focal length, the zoom group and the compensation group move towards each other. The front and rear surface radii of curvature of the meniscus lens L11 are 49.918 mm to 50.610 mm and 33.223 mm, respectively. The front and rear surface radii of curvature of the meniscus lens L12 are 34.128mm~34.477mm and 138.445mm~142.933mm, respectively; the front and rear surface radii of curvature of the meniscus lens L13 are 32.356mm~35.065mm and 82.365mm~92.336mm, respectively; the front and rear surface radii of curvature of the meniscus lens L21 are 47.410mm~52.587mm and 9.654mm~9.684mm, respectively; the front surface radius of curvature of the cemented doublet lens L22 is -27.305mm~-25.848mm, the cemented surface radius of curvature is 14.800mm~15.973mm, and the rear surface radius of curvature is... The front and rear surface radii of curvature of the L31 meniscus lens are 11.083mm~11.323mm and 66.602mm~73.190mm, respectively; the front and rear surface radii of curvature of the L32 meniscus lens are 5.058mm~5.393mm and 4.646mm~4.999mm, respectively; the front surface radius of curvature of the L33 cemented doublet lens is 11.621mm~13.065mm, the cemented surface radius of curvature is -5.786mm~-5.735mm, and the rear surface radius of curvature is -12.381mm~-12.183mm; the front and rear surface radii of curvature of the L41 meniscus lens are -10.686mm~-10.The front and rear surface radii of curvature of the biconvex lens L42 are 107mm and 20.215mm~27.588mm, respectively, which are 28.671mm~36.694mm and -21.407mm~-17.817mm.

2. The large field-of-view continuous zoom optical system from visible light to near-infrared band according to claim 1, characterized in that... The materials of the meniscus lens L11 are H-ZF7LA; the materials of the meniscus lens L12 are H-ZPK5; the materials of the meniscus lens L13 are H-ZPK5; the materials of the meniscus lens L21 are H-LAF55; the materials of the biconcave lens L221 are CAF2; the materials of the meniscus lens L222 are H-ZF73; the materials of the meniscus lens L31 are H-ZPK7; the materials of the meniscus lens L32 are H-FK95N; the materials of the biconvex lens L331 are H-FK71; the materials of the meniscus lens L332 are H-ZLAF76A; the materials of the meniscus lens L41 are H-K9L; and the materials of the biconvex lens L42 are H-LAK53A.

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

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

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

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

Images