An 8x zoom lens with fog penetration and full-range shooting capabilities

Abstract

The present invention relates to an 8x zoom lens with fog-penetrating, full-range dual-purpose photography. The front fixed lens group comprises a negative meniscus lens A and a biconvex lens B bonded together in a first cemented group, a positive meniscus lens C, a negative meniscus lens D, and a positive meniscus lens E bonded together in a second cemented group; a zoom lens group comprises a plano-concave lens F, a biconcave lens G, and a biconvex lens H bonded together in a third cemented group, and a biconcave lens I; a compensating lens group comprises a biconvex lens J, a negative meniscus lens K, and a biconvex lens L bonded together in a fourth cemented group, and a biconvex lens M; and a rear fixed lens group comprises a biconcave lens N, a positive meniscus lens O, and a negative meniscus lens P bonded together in a fifth cemented group, a biconcave lens Q and a biconvex lens R bonded together in a sixth cemented group, and a negative meniscus lens S, a biconvex lens T, and a negative meniscus lens U bonded together in a seventh cemented group. This lens can perform wide-range search, tracking, and ultra-high-definition photography of targets at both near and far distances and in high-speed motion, and is suitable for scenarios requiring unmanned monitoring, early warning, reconnaissance and strike, and imaging guidance, broadening its application scenarios.

Description

Technical Field

[0001] The invention relates to an 8-fold zoom lens capable of penetrating fog and being used for full-range photography. Background Art

[0002] In visible light imaging systems, zoom optical lenses capable of dual-purpose video and photo capture over a wide range of targets offer significant advantages over traditional zoom optical lenses in practical applications such as unmanned surveillance, early warning, reconnaissance and strike, and imaging guidance. They enable both real-time zoom tracking of targets and ultra-high-definition zoom photography. However, existing continuous zoom optical lenses offer suboptimal imaging targets, limiting their application. This design was the catalyst for this project. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an 8x zoom lens with fog-penetrating and full-range photography capabilities.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: an 8x zoom lens with full-range photography and fog-penetrating function, the optical system of the lens includes a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group and a filter arranged in sequence from left to right along the incident direction of light, the front fixed lens group includes a first cemented group of a negative meniscus lens A and a biconvex lens B, a positive meniscus lens C, a negative meniscus lens D and a positive meniscus lens E, which are arranged in sequence from left to right; the zoom lens group includes a first cemented group of a negative meniscus lens A and a biconvex lens B, which are arranged in sequence from left to right, a second cemented group of a positive meniscus lens C, a negative meniscus lens D and a positive meniscus lens E, which are arranged in sequence from left to right; The plano-concave lens F, the third cemented group of the biconcave lens G and the biconvex lens H in close contact, and the biconcave lens I; the compensation lens group includes, from left to right, a biconvex lens J, a fourth cemented group of the negative meniscus lens K and the biconvex lens L in close contact, and the biconvex lens M; the rear fixed lens group includes, from left to right, a biconcave lens N, a fifth cemented group of the positive meniscus lens O and the negative meniscus lens P in close contact, a sixth cemented group of the biconcave lens Q and the biconvex lens R in close contact, and a seventh cemented group of the negative meniscus lens S, the biconvex lens T and the negative meniscus lens U in close contact.

[0005] Preferably, the air gap between the front fixed lens group and the zoom lens group is 2.4mm-35.0mm, the air gap between the zoom lens group and the compensation lens group is 67.2mm-1.8mm, and the air gap between the compensation lens group and the rear fixed lens group is 3.7mm-36.5mm.

[0006] Preferably, the air gap between the first cemented group and the positive meniscus lens C is 0.2 mm, and the air gap between the positive meniscus lens C and the second cemented group is 0.2 mm; the air gap between the plano-concave lens F and the third cemented group is 4.1 mm, and the air gap between the third cemented group and the biconcave lens I is 1.0 mm; the air gap between the biconvex lens J and the fourth cemented group is 0.1 mm, and the air gap between the fourth cemented group and the biconvex lens M is 0.1 mm; the air gap between the biconcave lens N and the fifth cemented group is 0.1 mm, the air gap between the fifth cemented group and the sixth cemented group is 30.8 mm, the air gap between the sixth cemented group and the negative meniscus lens S is 0.8 mm, and the air gap between the negative meniscus lens S and the seventh cemented group is 5.6 mm.

[0007] Preferably, the biconvex lens B, the positive meniscus lens C, the positive meniscus lens E, the biconcave lens G, the biconvex lens L, and the biconvex lens M are all made of optical glass with ultra-low dispersion.

[0008] Preferably, the mechanical structure of the lens includes a focusing main lens barrel, a main lens barrel and a rear lens barrel arranged in sequence from left to right, a front lens barrel is provided inside the focusing main lens barrel, a zoom slide and a compensation slide are provided inside the main lens barrel, and a zoom lens barrel and a compensation lens barrel are provided on the zoom slide and the compensation slide respectively; the front fixed lens group, the zoom lens group, the compensation lens group and the rear fixed lens group are respectively installed on the front lens barrel, the zoom lens barrel, the compensation lens barrel and the rear lens barrel.

[0009] Preferably, the mechanical structure of the lens also includes an electric focusing mechanism, an electric zoom mechanism, an electric mist-penetrating switching mechanism and a large-target-area camera assembly, the electric focusing mechanism selects a front fixed lens group as a focusing movable group; the electric zoom mechanism drives the magnification lens group and the compensation lens group to perform linear reciprocating motion through the magnification slide and the compensation slide respectively to complete the continuous zoom switching of the lens; the electric mist-penetrating switching mechanism is connected to the light barrier seat, and the electric mist-penetrating switching mechanism controls the rotation of the filter turntable; the large-target-area camera assembly is installed on the electric mist-penetrating switching mechanism.

[0010] Compared with the existing technology, the present invention has the following beneficial effects: the present invention has a reasonable design, realizes continuous zoom of a large target surface with a focal length of 40.1mm-321mm, can perform large-scale search, tracking video and ultra-high-definition photography of targets at long and short distances and high-speed movement, and is applicable to scenarios requiring unmanned monitoring, early warning, reconnaissance and strike, imaging guidance, etc.; a fog-penetrating band filter is provided at the rear end of the lens, so that the lens can adapt to the use requirements in harsh environments, while broadening the application scenarios.

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the optical structure of the lens in an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of the mechanical structure of a lens in an embodiment of the present invention;

[0014] Figure 3 1 is a schematic diagram of the appearance structure of a lens in an embodiment of the present invention;

[0015] Figure 4 is a short-focus MTF diagram of the lens in an embodiment of the present invention;

[0016] Figure 5 is a telephoto MTF diagram of the lens in an embodiment of the present invention;

[0017] Figure 6 The structure of the electric focusing mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 7 The structure of the electric focusing mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 8 The structure of the electric zoom mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 9 The structure of the electric zoom mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 10 This is a schematic diagram of the structure of the electric mist-penetrating switching mechanism in an embodiment of the present invention. Figure 1 ;

[0022] Figure 11 This is a schematic diagram of the structure of the electric mist-penetrating switching mechanism in an embodiment of the present invention. Figure 2 .

[0023] exist Figure 1 middle:

[0024] 11-Front fixed lens group; 111-Negative meniscus lens A; 112-Biconvex lens B; 113-Positive meniscus lens C; 114-Negative meniscus lens D; 115-Positive meniscus lens E; 12-Zoom lens group; 121-Plano-concave lens F; 122-Biconcave lens G; 123-Biconvex lens H; 124-Biconcave lens I; 13-Compensating lens group; 131-Biconvex lens J; 132-Negative meniscus lens K; 133-Biconvex lens L; 134-Biconvex lens M; 14-Rear fixed lens group; 141-Biconcave lens N; 142-Positive meniscus lens O; 143-Negative meniscus lens P; 144-Biconcave lens Q; 145-Biconvex lens R; 146-Negative meniscus lens S; 147-Biconvex lens T; 148-Negative meniscus lens U; 15-Filter;

[0025] exist Figure 2-3 middle:

[0026] 16-Electric focusing mechanism; 17-Electric zoom mechanism; 18-Electric mist-penetrating switching mechanism; 19-Rear fixing assembly; 20-Large-area camera assembly;

[0027] exist Figure 6-11 middle:

[0028] 21-focusing lens group; 22-focusing cam pressure ring; 23-focusing guide pin assembly; 24-focusing cam; 25-focusing main lens barrel; 26-focusing micro switch; 27-focusing limit pin; 28-focusing motor gear; 29-focusing motor; 210-focusing potentiometer gear; 211-focusing potentiometer; 31-zooming lens group; 32-zooming slide; 33-front steel balls; 34-zooming guide pin assembly; 35-zooming cam; 36-main lens barrel; 37-rear steel balls; 38-zooming cam pressure ring; 39-compensating lens group; 3 10-Compensation slide; 311-Compensation guide pin assembly; 312-Zoom micro switch; 313-Zoom limit pin; 314-Zoom potentiometer; 315-Zoom motor; 316-Zoom potentiometer gear; 317-Zoom motor gear; 41-Rear group connecting plate; 42-Visible light filter; 43-Filter turntable shaft; 44-Filter micro switch; 45-Near-infrared filter; 46-Filter turntable; 47-Filter motor gear; 48-Filter pulley; 49-Filter motor; 510-Filter limit pin. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] like Figures 1 to 11 As shown, this embodiment provides an 8x zoom lens with fog-penetrating full-range dual-purpose for photography. 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 a filter, which are arranged in sequence from left to right along the direction of light incidence. The front fixed lens group includes a first cemented group of a negative meniscus lens A and a biconvex lens B, which are closely connected, and a second cemented group of a positive meniscus lens C, a negative meniscus lens D, and a positive meniscus lens E, which are closely connected. The zoom lens group includes a plano-concave lens, which are arranged in sequence from left to right. The present invention aims to provide an 8x zoom lens with full-range photography and a fog-proof function, which is suitable for both photography and video recording.

[0033] In an embodiment of the present invention, the air gap between the front fixed lens group and the zoom lens group is 2.4mm-35.0mm, the air gap between the zoom lens group and the compensation lens group is 67.2mm-1.8mm, and the air gap between the compensation lens group and the rear fixed lens group is 3.7mm-36.5mm.

[0034] In an embodiment of the present invention, the air gap between the first cemented group and the positive meniscus lens C is 0.2 mm, and the air gap between the positive meniscus lens C and the second cemented group is 0.2 mm; the air gap between the plano-concave lens F and the third cemented group is 4.1 mm, and the air gap between the third cemented group and the biconcave lens I is 1.0 mm; the air gap between the biconvex lens J and the fourth cemented group is 0.1 mm, and the air gap between the fourth cemented group and the biconvex lens M is 0.1 mm; the air gap between the biconcave lens N and the fifth cemented group is 0.1 mm, the air gap between the fifth cemented group and the sixth cemented group is 30.8 mm, the air gap between the sixth cemented group and the negative meniscus lens S is 0.8 mm, and the air gap between the negative meniscus lens S and the seventh cemented group is 5.6 mm.

[0035] In this embodiment of the present invention, the biconvex lens B, positive meniscus lens C, positive meniscus lens E, biconcave lens G, biconvex lens L, and biconvex lens M are all made of ultra-low dispersion optical glass. By selecting ultra-low dispersion optical glass materials, the chromatic aberration of the system is reduced and the system resolution is improved.

[0036] In an embodiment of the present invention, the mechanical structure of the lens includes a focusing main lens barrel, a main lens barrel and a rear lens barrel arranged in sequence from left to right, a front lens barrel is provided inside the focusing main lens barrel, a magnification slide and a compensation slide are provided inside the main lens barrel, and a magnification lens barrel and a compensation lens barrel are respectively provided on the magnification slide and the compensation slide; the front fixed lens group, the magnification lens group, the compensation lens group and the rear fixed lens group are respectively installed on the front lens barrel, the magnification lens barrel, the compensation lens barrel and the rear lens barrel.

[0037] In an embodiment of the present invention, the mechanical structure of the lens also includes an electric focusing mechanism, an electric zoom mechanism, an electric mist-penetrating switching mechanism and a large-target-area camera assembly. The electric focusing mechanism selects a front fixed lens group as a focusing movable group; the electric zoom mechanism drives the magnification lens group and the compensation lens group to perform linear reciprocating motion through the magnification slide and the compensation slide respectively to complete continuous zoom switching of the lens; the electric mist-penetrating switching mechanism is connected to the light barrier seat, and the electric mist-penetrating switching mechanism controls the rotation of the filter turntable; the large-target-area camera assembly is installed on the electric mist-penetrating switching mechanism.

[0038] like Figure 6 、 7As shown, the electric focusing mechanism utilizes a fixed lens group at the front of the optical system to form the focusing lens assembly 21. The focusing lens assembly 21 is assembled into the main focusing lens barrel 25 after being ground and fitted. A focusing cam 24 is mounted on the main focusing lens barrel 25 and secured with a focusing cam pressure ring 22. The focusing cam 24 is milled with linear bevel grooves according to optical requirements, while the main focusing lens barrel 25 is milled with straight grooves. Three focusing guide pin assemblies 23, evenly spaced 120° apart, connect the focusing lens assembly 21 to the focusing cam 24 and the main focusing lens barrel 25. A focusing motor gear 28 meshes with a gear on the focusing cam 24. When the focusing motor 29 is powered on and rotates, driving the focusing cam 24, the rotational motion of the focusing lens assembly 21 is converted into linear motion by the straight grooves on the main focusing lens barrel 25, thereby achieving focus on both near and far objects. When focusing on near or far targets, the focus potentiometer gear 210 engages with the focus motor gear 28 to drive the focus potentiometer 211 shaft to rotate, causing the resistance value of the focus potentiometer 211 to change. The changed value of the focus potentiometer 211 can be read out through an appropriate sampling circuit and transmitted to the control center, thereby realizing the display of the focus distance value; conversely, by giving commands through the control center, real-time control of the focus distance value can be realized.

[0039] like Figure 8 、 9As shown, in the electric zoom mechanism, the zoom lens assembly 31 is screwed onto the zoom carriage 32, forming the zoom assembly; the compensating lens assembly 39 is screwed onto the compensating carriage 310, forming the compensating assembly. The zoom carriage 32 and the compensating carriage 310 are each ground to fit within the main lens barrel 36 and then installed within it. The zoom cam 35 is mounted on the main lens barrel 36 using precision front and rear steel balls 33 and 37. The zoom cam pressure ring 38 compresses the cam, forming a rolling bearing structure that converts sliding friction during rotation into rolling friction, reducing friction during the movement of the zoom cam 35. The zoom cam 35 is milled with zoom and compensation curve grooves, respectively, as required by the optical zoom motion equation. The zoom guide pin assembly 34 and the compensation guide pin assembly 311 connect the zoom cam 35 to the zoom carriage 32 and the compensating carriage 310, respectively. The zoom motor gear 317 and the zoom potentiometer gear 316 mesh with the zoom cam 35. When the rotor of the zoom motor 315 rotates positively and negatively, the precision potentiometer 314 and the zoom cam 35 rotate synchronously. The zoom and compensation curved grooves, along with the zoom guide pin assemblies 34 and 311, drive the zoom slide 32 and 310 to move along the zoom and compensation curved grooves. Two straight grooves in the main lens barrel 36 support the zoom guide pin assemblies 34 and 311 and convert the rotational motion of the zoom slide 32 and 310 into linear motion. Strictly controlled clearances between the zoom guide pin assemblies 34 and 311, the curved grooves of the zoom cam 35, and the linear grooves of the main lens barrel 36 ensure smooth, comfortable movement of the zoom and compensation assemblies without binding. This rotation of the zoom motor 315 ensures the forward and backward linear motion of the zoom and compensation assemblies according to the zoom motion equations, thereby achieving continuous focal length adjustment. When the focal length of the system changes, the zoom potentiometer gear 316 engages with the zoom cam 35 gear to rotate the precision potentiometer 314, and the resistance value of the precision potentiometer 314 changes. The changed value of the precision potentiometer 314 can be taken out through an appropriate sampling circuit and transmitted to the control center, thereby realizing the display of the focal length value; conversely, by giving a command through the control center, real-time control of the focal length can be realized.

[0040] like Figure 10 、 11 As shown, the electric mist-penetrating switching mechanism: the visible light filter 52 and the infrared filter 55 are respectively Figure 10 、 11The filter disc 56 is installed in the position shown. The filter disc 56 is fixed to the rear connecting plate 51 via the filter disc shaft 53, ensuring smooth and non-binding rotation. The gear of the filter motor 59 meshes with the gear of the filter disc 56 via the filter pulley 58. When the filter motor 59 is powered, it drives the filter disc 56 to rotate, and the filter limit pin 54 acts as a limiter, thereby switching back and forth between the visible light filter and the infrared filter, ultimately achieving fog penetration requirements. The large-format camera assembly is connected via a slot on the rear connecting plate 51, controlling the positional accuracy of the large-format camera's target surface during adjustment. This limits the freedom of the lens during overall debugging, ensuring efficient lens debugging.

[0041] In the embodiment of the present invention, the optical system composed of the above lens group achieves the following optical indicators:

[0042] Focal length: f′min=40.1mm, f′max=321mm;

[0043] Relative aperture D / f′: 1 / 4.7~1 / 5.2;

[0044] Field of view: 3.1°×2.5°~25.3°×20.2°;

[0045] Total optical length ∑L≤210mm;

[0046] Zoom stroke ≤32.6mm;

[0047] The transmission spectrum of the color filter: 750~900nm through fog.

[0048] In an embodiment of the present invention, the optical design of the front fixed lens group is complicated by adding a positive lens and selecting ED (extra-low dispersion) optical glass. This improves the optical power carrying capacity of the front fixed lens group, which has the highest on-axis light height, and effectively reduces aberrations such as the secondary spectrum of the optical lens, enabling the lens to form images over a wide spectral range with significantly improved resolution, making it compatible with ultra-high-definition cameras.

[0049] In the embodiment of the present invention, when imaging, light passes through the first cemented group, positive meniscus lens C, second cemented group, plano-concave lens F, third cemented group, biconcave lens I, biconvex lens J, fourth cemented group, biconvex lens M, biconcave lens N, fifth cemented group, sixth cemented group, negative meniscus lens S, seventh cemented group, and filter in order from left to right to form an image.

[0050] In this embodiment, the lens parameters of the front fixed lens group, the zoom lens group, the compensating lens group and the rear fixed lens group are shown in the following table.

[0051]

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An 8x zoom lens with fog-penetrating, full-range photography capability, featuring: The optical system of the lens is composed of a front fixed lens group, a zoom lens group, a compensating lens group, a rear fixed lens group and a filter, which are arranged in sequence from left to right along the incident direction of light. The front fixed lens group is composed of a first cemented group of a negative meniscus lens A and a biconvex lens B, which are arranged in sequence from left to right, and a second cemented group of a positive meniscus lens C, a negative meniscus lens D and a positive meniscus lens E; the zoom lens group is composed of a plano-concave lens F, a third cemented group of a biconcave lens G and a biconvex lens H, which are arranged in sequence from left to right, and a biconcave lens I; the compensating ... positive meniscus lens C, a plano-concave lens F, a biconcave lens G and a biconvex lens H, which are arranged in sequence from left to right, and a biconcave lens I; the The optical system comprises a first lens and a second lens, and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The second lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens. The first lens comprises a first lens and a second lens.

2. The 8x zoom lens with fog-penetrating function for full-range photography according to claim 1, characterized in that: The air gap between the front fixed lens group and the zoom lens group is 2.4mm-35.0mm, the air gap between the zoom lens group and the compensation lens group is 67.2mm-1.8mm, and the air gap between the compensation lens group and the rear fixed lens group is 3.7mm-36.5mm.

3. The 8x zoom lens with fog-penetrating function for full-range photography according to claim 1, characterized in that: The air gap between the first cemented group and the positive meniscus lens C is 0.2 mm, and the air gap between the positive meniscus lens C and the second cemented group is 0.2 mm; the air gap between the plano-concave lens F and the third cemented group is 4.1 mm, and the air gap between the third cemented group and the biconcave lens I is 1.0 mm; the air gap between the biconvex lens J and the fourth cemented group is 0.1 mm, and the air gap between the fourth cemented group and the biconvex lens M is 0.1 mm; the air gap between the biconcave lens N and the fifth cemented group is 0.1 mm, the air gap between the fifth cemented group and the sixth cemented group is 30.8 mm, the air gap between the sixth cemented group and the negative meniscus lens S is 0.8 mm, and the air gap between the negative meniscus lens S and the seventh cemented group is 5.6 mm.

4. The 8x zoom lens with fog-penetrating function for full-range photography according to claim 1, characterized in that: The mechanical structure of the lens includes a focusing main lens barrel, a main lens barrel and a rear lens barrel arranged in sequence from left to right, a front lens barrel is provided inside the focusing main lens barrel, a zoom slide and a compensation slide are provided inside the main lens barrel, and a zoom lens barrel and a compensation lens barrel are provided on the zoom slide and the compensation slide respectively; the front fixed lens group, the zoom lens group, the compensation lens group and the rear fixed lens group are respectively installed on the front lens barrel, the zoom lens barrel, the compensation lens barrel and the rear lens barrel.

5. The 8x zoom lens with fog-penetrating function for full-range photography according to claim 4, characterized in that: The mechanical structure of the lens also includes an electric focusing mechanism, an electric zoom mechanism, an electric mist-penetrating switching mechanism and a large-target-area camera assembly. The electric focusing mechanism uses a front fixed lens group as a focusing movable group; the electric zoom mechanism drives the magnification lens group and the compensation lens group to perform linear reciprocating motion through the magnification slide and the compensation slide respectively to complete continuous zoom switching of the lens; the electric mist-penetrating switching mechanism is connected to the light barrier seat, and the electric mist-penetrating switching mechanism controls the rotation of the filter turntable; the large-target-area camera assembly is installed on the electric mist-penetrating switching mechanism.

Images