Light and small 4k ultra-definition seven-time continuous zooming fog-penetrating lens and imaging method

Abstract

The invention relates to a light and small 4k ultra-definition seven-time continuous zoom fog-penetrating lens and an imaging method, the light and small 4k ultra-definition seven-time continuous zoom fog-penetrating lens comprises an optical system, and the optical system of the lens comprises a front fixed lens group, a zoom lens group, a compensation lens group and a rear fixed lens group which are sequentially arranged from left to right along a light incident light path; the front fixed lens group is composed of a first gluing group formed by tightly connecting a negative meniscus lens A and a biconvex lens B, a plano-convex lens C and a positive meniscus lens D; the zoom lens group is composed of a negative meniscus lens E, a second gluing group formed by tightly connecting a biconcave lens F and a biconvex lens G, and a biconcave lens H; the compensating lens group consists of a biconvex lens I, a third gluing group formed by tightly connecting a negative crescent lens J and a biconvex lens K, and a plano-convex lens L; a continuous zoom closed-loop control function is realized; large-range real-time super-definition imaging can be carried out, and the system can be applied to requirements of unmanned monitoring, early warning and the like; the fog-penetrating wave band color filter is arranged at the rear end of the lens, so that the lens can adapt to the use requirement in a severe environment, and meanwhile, the application scene is widened.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to a lightweight 4K ultra-high-definition 7x continuous zoom lens for fog-penetrating imaging and its imaging method. Background Technology

[0002] In visible light imaging systems, with the emergence of various application scenarios driven by different needs, lightweight 4K ultra-high-definition 7x continuous zoom lenses with fog-penetrating capabilities offer significant advantages over traditional zoom lenses in many practical applications. Therefore, this case study was developed. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a lightweight 4K ultra-high-definition 7x continuous zoom fog-penetrating lens and imaging method. The design is reasonable, realizes lightweight ultra-high-definition continuous zoom with fog-penetrating function, and broadens the application scenarios.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a lightweight 4K ultra-high-definition 7x continuous zoom lens for fog-penetrating imaging, comprising an optical system, characterized in that: the optical system of the lens comprises a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, and a color filter arranged sequentially from left to right along the incident light path; the front fixed lens group consists of a first cemented group of a negative meniscus lens A and a biconvex lens B closely bonded together, a plano-convex lens C, and a positive meniscus lens D arranged sequentially from left to right; the zoom lens group consists of a front fixed lens group of a negative meniscus lens A and a biconvex lens B closely bonded together, a plano-convex lens C, and a positive meniscus lens D arranged sequentially from left to right. The first set of lenses consists of a negative crescent lens E, a biconcave lens F, and a biconvex lens G in a closely bonded second cemented group, and a biconcave lens H. The second set of lenses consists of a biconvex lens I, a negative crescent lens J, and a biconvex lens K in a closely bonded third cemented group, arranged from left to right, and a plano-convex lens L. The third set of lenses consists of a rear fixed lens group consisting of a negative crescent lens M, a positive crescent lens N, a negative crescent lens O, and a biconvex lens P in a closely bonded fourth cemented group, and a negative crescent lens Q, a negative crescent lens R, a biconvex lens S, and a negative crescent lens T in a closely bonded fifth cemented group, arranged from left to right.

[0005] Preferably, the air gap between the front fixed lens group and the zoom lens group is 5.3mm-36.8mm, the air gap between the zoom lens group and the compensating lens group is 69.3mm-1.4mm, and the air gap between the compensating lens group and the rear fixed lens group is 4.4mm-40.8mm.

[0006] Preferably, the on-axis distances between the lenses satisfy the following relationships: the air gap between the first cemented group and the plano-convex lens C is 0.1 mm; the air gap between the plano-convex lens C and the positive meniscus lens D is 0.2 mm; the air gap between the negative meniscus lens E and the second cemented group is 4.0 mm; the air gap between the second cemented group and the biconcave lens H is 1.0 mm; the air gap between the biconvex lens I and the third cemented group is 0.1 mm; the air gap between the third cemented group and the plano-convex lens L is 0.1 mm; the air gap between the negative meniscus lens M and the positive meniscus lens N is 0.1 mm; the air gap between the positive meniscus lens N and the fourth cemented group is 16.3 mm; the air gap between the fourth cemented group and the negative meniscus lens Q is 11.1 mm; the air gap between the negative meniscus lens Q and the negative meniscus lens R is 13.7 mm; and the air gap between the negative meniscus lens R and the fifth cemented group is 0.1 mm.

[0007] Preferably, the biconvex lens B, plano-convex lens C, meniscus lens D, biconvex lens K, and plano-convex lens L are all made of ultra-low dispersion optical glass.

[0008] Preferably, the lens is provided with a focusing main lens barrel, a main lens barrel and a rear lens barrel from left to right. The focusing main lens barrel is provided with a front lens barrel. The main lens barrel is provided with a zoom slide and a compensation slide. The zoom slide and the compensation slide are respectively provided with a zoom lens barrel and a compensation lens barrel. The front fixed lens group, the zoom lens group, the compensation lens group and the rear fixed lens group are respectively mounted on the front lens barrel, the zoom lens barrel, the compensation lens barrel and the rear lens barrel.

[0009] Preferably, the lens further includes an electric focusing mechanism, an electric zoom mechanism, an electric color filter switching mechanism, and a detector camera assembly; the electric focusing mechanism uses a front fixed lens group as the focusing movement group; the electric zoom mechanism drives the zoom lens group and the compensation lens group to perform linear reciprocating motion through the zoom slide and the compensation slide respectively, so as to complete the continuous zoom switching of the lens; the electric color filter switching mechanism is connected to the aperture mount and controls the rotation of the color filter turntable through the electric color filter switching mechanism; the detector camera assembly is mounted on the electric color filter switching mechanism.

[0010] An imaging method for a lightweight 4K ultra-high-definition 7x continuous zoom fog-penetrating lens comprises the following steps: light rays pass sequentially from left to right through a negative meniscus lens A, a biconvex lens B, a plano-convex lens C, a positive meniscus lens D, a negative meniscus lens E, a biconcave lens F, a biconvex lens G, a biconcave lens H, a biconvex lens I, a negative meniscus lens J, a biconvex lens K, a plano-convex lens L, a negative meniscus lens M, a positive meniscus lens N, a negative meniscus lens O, a biconvex lens P, a negative meniscus lens Q, a negative meniscus lens R, a biconvex lens S, and a negative meniscus lens T before forming an image on the imaging plane.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention is reasonably designed and achieves high-definition continuous zoom with a focal length of 39.5-276.5mm, enabling large-scale real-time ultra-high-definition imaging. It can be applied to scenarios requiring unmanned monitoring and early warning. A fog-penetrating color filter is set at the rear of the lens, which enables the lens to adapt to the requirements of use in harsh environments and expands the application scenarios.

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the optical structure of the lens in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the mechanical structure of the lens in an embodiment of the present invention;

[0016] Figure 3 This is the short-focus MTF diagram of the lens in this embodiment of the invention;

[0017] Figure 4 This is the telephoto MTF diagram of the lens in this embodiment of the invention.

[0018] In the diagram: 11-Front fixed lens group; 111-Negative meniscus lens A; 112-Biconvex lens B; 113-Plano-convex lens C; 114-Positive meniscus lens D; 12-Zoom lens group; 121-Negative meniscus lens E; 122-Biconcave lens F; 123-Biconvex lens G; 124-Biconcave lens H; 13-Compensation lens group; 131-Biconvex lens I; 132-Negative meniscus lens J; 133-Biconvex lens K; 134-Plano-convex lens 14-Rear fixed lens group; 141-Negative meniscus lens M; 142-Positive meniscus lens N; 143-Negative meniscus lens O; 144-Biconvex lens P; 145-Negative meniscus lens Q; 146-Negative meniscus lens R; 147-Biconvex lens S; 148-Negative meniscus lens T; 15-Color filter; 16-Electric focusing mechanism; 17-Electric zoom mechanism; 18-Electric color filter switching mechanism; 19-Detector camera assembly. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] Example 1

[0022] like Figures 1-4 As shown, a lightweight 4K ultra-high-definition 7x continuous zoom lens for fog-penetrating imaging includes an optical system. The optical system comprises, from left to right along the incident light path, a front fixed lens group 11, a zoom lens group 12, a compensation lens group 13, a rear fixed lens group 14, and a color filter 15. The front fixed lens group consists of a first cemented group of a negative meniscus lens A111 and a biconvex lens B112, arranged from left to right, a plano-convex lens C113, and a positive meniscus lens D114. The zoom lens group consists of a negative meniscus lens E121, a biconcave lens F122, and a biconvex lens D114, arranged from left to right. The first assembly consists of a second cemented lens group with lens G123 tightly bonded together and a biconcave lens H124; the second assembly consists of a third cemented lens group with biconvex lens I131, negative crescent lens J132 and biconvex lens K133 tightly bonded together, arranged from left to right, and a plano-convex lens L134; the third assembly consists of a fourth cemented lens group with negative crescent lens M141, positive crescent lens N142, negative crescent lens O143 and biconvex lens P144 tightly bonded together, arranged from left to right, and a fifth cemented lens group with negative crescent lens Q145, negative crescent lens R146, biconvex lens S147 and negative crescent lens T148 tightly bonded together.

[0023] In this embodiment, the air gap between the front fixed lens group 11 and the zoom lens group 12 is 5.3mm-36.8mm, the air gap between the zoom lens group 12 and the compensation lens group 13 is 69.3mm-1.4mm, and the air gap between the compensation lens group 13 and the rear fixed lens group 14 is 4.4mm-40.8mm.

[0024] In this embodiment, the air gap between the first cemented group and the plano-convex lens C is 0.1 mm, and the air gap between the plano-convex lens C and the positive meniscus lens D is 0.2 mm; the air gap between the negative meniscus lens E and the second cemented group is 4.0 mm, and the air gap between the second cemented group and the biconcave lens H is 1.0 mm; the air gap between the biconvex lens I and the third cemented group is 0.1 mm, and the air gap between the third cemented group and the plano-convex lens L is 0.1 mm; the air gap between the negative meniscus lens M and the positive meniscus lens N is 0.1 mm, the air gap between the positive meniscus lens N and the fourth cemented group is 16.3 mm, the air gap between the fourth cemented group and the negative meniscus lens Q is 11.1 mm, the air gap between the negative meniscus lens Q and the negative meniscus lens R is 13.7 mm, and the air gap between the negative meniscus lens R and the fifth cemented group is 0.1 mm.

[0025] In this embodiment, the biconvex lens B112, plano-convex lens C113, meniscus lens D114, biconvex lens K133, and plano-convex lens L134 are all made of ultra-low dispersion optical glass. By selecting ultra-low dispersion optical glass material, the chromatic aberration of the system is reduced, and the system resolution is improved.

[0026] The optical system composed of the above lens group achieves the following optical properties:

[0027] Focal length: f′min=39.5mm, f′max=276.5mm;

[0028] Field of view: 19.31°×10.93°~2.76°×1.56°;

[0029] F-numbers: F4.5 for short telephoto lenses, F4.9 for long telephoto lenses.

[0030] Total optical length ∑L: 205mm;

[0031] Variable stroke: 31.5mm;

[0032] Spectral range: 470nm~1000nm.

[0033] In this embodiment, a positive compensation initial structure is selected during the selection process. This structure is beneficial for reducing second-order spectral aberrations and improving imaging quality at long focal lengths. The front fixed lens group uses ultra-low dispersion materials (such as FCD100, H-FK95N, etc.) to further reduce second-order spectral aberrations and improve resolution. By selecting high-refractive-index, low-dispersion glass as the material for the positive lens, the curvature of the refractive surface is reduced, which is beneficial for correcting higher-order spherical aberrations at on-axis and off-axis points. Appropriate complexity is applied to the zoom group and the rear fixed group to reduce image distortion at both long and short focal lengths and to decrease the lead of the motion components.

[0034] In this embodiment, during imaging: light passes from left to right sequentially through the first cemented group, plano-convex lens C113, positive meniscus lens D114, negative meniscus lens E121, second cemented group, biconcave lens H124, biconvex lens I131, third cemented group, plano-convex lens L134, negative meniscus lens M141, positive meniscus lens N142, fourth cemented group, negative meniscus lens Q145, negative meniscus lens R146, fifth cemented group, and color filter 15 before forming an image.

[0035]

[0036] Table 1

[0037] In this embodiment, the lens parameters of the front fixed lens group 11, the zoom lens group 12, the compensating lens group 13, and the rear fixed lens group 14 are shown in Table 1 above.

[0038] Example 2

[0039] like Figure 2 As shown, this embodiment supplements the mechanical structure of the lens based on Embodiment 1. Specifically, the lens is provided with a focusing main lens barrel, a main lens barrel, an aperture mount, and a color filter dial from left to right. The focusing main lens barrel is provided with a front lens barrel. The main lens barrel is provided with a zoom slide and a compensation slide. The zoom slide and the compensation slide are respectively provided with a zoom lens barrel and a compensation lens barrel. The front fixed lens group, the zoom lens group, the compensation lens group, and the rear fixed lens group are respectively mounted on the front lens barrel, the zoom lens barrel, the compensation lens barrel, and the rear lens barrel.

[0040] In this embodiment, the lens is a relatively complex and precise long focal length zoom lens with very high precision requirements. During operation, the image must be stable, and the zoom axis wobble must be carefully controlled. The optical spacing and axial fit tolerances of the lens must be very small. The system requires high coaxiality of each lens element. During assembly, each section of the lens barrel must be rotated, and automatic alignment is achieved using the sphericality and weight of the lenses. A centering instrument is used to check the concentricity of each lens group. After assembly, the image quality of the lens barrel is checked on a collimator to ensure the image quality of the lens. The image plane position of the lens is adjustable (commonly known as focusing), and the focusing accuracy requirement is very high. During focusing, the circular motion of the motor must be converted into the linear motion of the focusing group. This lens uses a high-precision cam mechanism, which has the advantages of precise and flexible focusing with minimal backlash. The zoom mechanism employs two zoom groups and three compensation groups. The zoom cam, via a guide pin assembly, drives the zoom and compensation groups to slide relative to each other within the main lens barrel according to the zoom cam curve. This satisfies the optical system's requirement for point-to-point correspondence during simultaneous zoom and compensation movements. This mechanism offers advantages such as smooth transmission, reliability, no jump, and minimal backlash. The color filter switching mechanism uses a color filter motor to drive the color filter turntable, enabling rapid switching between visible light and infrared color filters. All three mechanisms utilize gear pairs for transmission. The motors are equipped with automatic slippage mechanisms and micro-switch limit protection structures when focusing, zooming, or switching the color filter to its two extreme positions to prevent motor stalling and damage. Furthermore, the entire lens's circuit control section includes protection circuitry to prevent damage from high voltage or incorrect wiring, improving overall reliability. The motor and lens are mounted on a back-mounted design and distributed along the lens's arc, resulting in a compact and aesthetically pleasing structure.

[0041] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0042] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0043] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A lightweight 4K ultra-high-definition 7x continuous zoom lens for defogging, comprising an optical system, characterized in that: The optical system of the lens includes a front fixed lens group, a zoom lens group, a compensating lens group, a rear fixed lens group, and color filters arranged sequentially from left to right along the incident light path. The front fixed lens group consists of a first cemented group consisting of a negative meniscus lens A and a biconvex lens B arranged in close proximity from left to right, a plano-convex lens C, and a positive meniscus lens D. The zoom lens group consists of a second cemented group consisting of a negative meniscus lens E, a biconcave lens F, and a biconvex lens G arranged in close proximity from left to right, and a biconcave lens H. The compensating lens group consists of a third cemented group consisting of a biconvex lens I, a negative meniscus lens J, and a biconvex lens K arranged in close proximity from left to right, and a plano-convex lens L. The rear fixed lens group consists of a fourth cemented group consisting of a negative meniscus lens M, a positive meniscus lens N, a negative meniscus lens O, and a biconvex lens P arranged in close proximity from left to right, a negative meniscus lens Q, a negative meniscus lens R, a biconvex lens S, and a negative meniscus lens T arranged in close proximity from left to right.

2. The lightweight 4K ultra-high-definition 7x continuous zoom lens for penetrating fog as described in claim 1, characterized in that: The air gap between the front fixed lens group and the zoom lens group is 5.3mm-36.8mm, the air gap between the zoom lens group and the compensating lens group is 69.3mm-1.4mm, and the air gap between the compensating lens group and the rear fixed lens group is 4.4mm-40.8mm.

3. The lightweight 4K ultra-high-definition 7x continuous zoom lens for defogging as described in claim 1, characterized in that: The axial distances between the lenses satisfy the following relationships: the air gap between the first cemented group and the plano-convex lens C is 0.1 mm; the air gap between the plano-convex lens C and the positive meniscus lens D is 0.2 mm; the air gap between the negative meniscus lens E and the second cemented group is 4.0 mm; the air gap between the second cemented group and the biconcave lens H is 1.0 mm; the air gap between the biconvex lens I and the third cemented group is 0.1 mm; the air gap between the third cemented group and the plano-convex lens L is 0.1 mm; the air gap between the negative meniscus lens M and the positive meniscus lens N is 0.1 mm; the air gap between the positive meniscus lens N and the fourth cemented group is 16.3 mm; the air gap between the fourth cemented group and the negative meniscus lens Q is 11.1 mm; the air gap between the negative meniscus lens Q and the negative meniscus lens R is 13.7 mm; and the air gap between the negative meniscus lens R and the fifth cemented group is 0.1 mm.

4. The lightweight 4K ultra-high-definition 7x continuous zoom lens for defogging as described in claim 1, characterized in that: The biconvex lens B, plano-convex lens C, meniscus lens D, biconvex lens K, and plano-convex lens L are all made of ultra-low dispersion optical glass.

5. A lightweight 4K ultra-high-definition 7x continuous zoom lens for penetrating fog as described in claim 1, characterized in that: The lens is provided with a focusing main lens barrel, a main lens barrel and a rear lens barrel from left to right. The focusing main lens barrel contains a front lens barrel. The main lens barrel contains a zoom slide and a compensation slide. The zoom slide and the compensation slide are respectively equipped with zoom lens barrels and compensation lens barrels. The front fixed lens group, zoom lens group, compensation lens group and rear fixed lens group are respectively mounted on the front lens barrel, zoom lens barrel, compensation lens barrel and rear lens barrel.

6. A lightweight 4K ultra-high-definition 7x continuous zoom lens for penetrating fog as described in claim 5, characterized in that: The lens also includes an electric focusing mechanism, an electric zoom mechanism, an electric color filter switching mechanism, and a detector camera assembly; the electric focusing mechanism uses a front fixed lens group as the focusing movement group; the electric zoom mechanism drives the zoom lens group and the compensation lens group to perform linear reciprocating motion through the zoom slide and the compensation slide respectively, so as to complete the continuous zoom switching of the lens; the electric color filter switching mechanism is connected to the aperture mount and controls the rotation of the color filter turntable through the electric color filter switching mechanism; the detector camera assembly is mounted on the electric color filter switching mechanism.

7. An imaging method applied to the lightweight 4K ultra-high-definition 7x continuous zoom lens for fog penetration as described in claim 2, characterized in that, The following steps are performed: Light rays pass from left to right through the following lenses in sequence: negative meniscus lens A, biconvex lens B, plano-convex lens C, positive meniscus lens D, negative meniscus lens E, biconcave lens F, biconvex lens G, biconcave lens H, biconvex lens I, negative meniscus lens J, biconvex lens K, plano-convex lens L, negative meniscus lens M, positive meniscus lens N, negative meniscus lens O, biconvex lens P, negative meniscus lens Q, negative meniscus lens R, biconvex lens S, and negative meniscus lens T before forming an image on the imaging plane.

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