A large target surface long focal length two-variable high-definition zoom lens and an imaging method thereof

Abstract

The present application relates to a kind of big target surface long focus two variable high-definition zoom lens and its imaging method, including lens, the optical system of lens is sequentially arranged from left to right along the direction of light incidence and is composed of front fixed mirror group, variable magnification mirror group, compensation mirror group and rear fixed mirror group.The present application is reasonable in design, realizes continuous zoom closed-loop control function, focusing closed-loop control function, focal length feedback function and image output function, can be searched, tracked and photographed to long-distance and high-speed movement target in a wide range, and is applied to unmanned monitoring, early warning, border defense and other demand scenarios.

Description

TECHNICAL FIELD

[0001] The present application relates to a large target surface long focal length two variable high-definition zoom lens and an imaging method thereof. BACKGROUND

[0002] In a visible light imaging system, an optical lens with precise long focal length zoom, high precision, smooth image during operation, and wide temperature range is required. Compared with traditional zoom optical lenses, it has greater advantages in practical application scenarios such as unmanned monitoring, early warning, and coastal defense, and can output smooth and clear images for real-time zoom tracking of targets. However, the existing long focal length optical lens has problems such as insufficient focal length, insufficient target surface, and inability to realize real-time zoom during operation, which limits its application scenarios. Therefore, the present application is born. SUMMARY

[0003] The present application improves the above problems, that is, the technical problem to be solved by the present application is to provide a large target surface long focal length two variable high-definition zoom lens and an imaging method thereof, which is reasonable in design and realizes 300mm to 1100mm large target surface continuous zoom, and widens the application scenarios.

[0004] The present application is composed of a lens, and the optical system of the lens is composed of a front fixed lens group, a zoom lens group, a compensation lens group and a rear fixed lens group arranged in order from left to right along the light incident direction; the front fixed lens group is composed of a double convex lens A, a positive crescent lens B and a first cemented group arranged in order from left to right, the first cemented group is composed of a negative crescent lens C and a positive crescent lens D in close contact; the zoom lens group is composed of a second cemented group and a negative crescent lens H arranged in order from left to right, the second cemented group is composed of a negative crescent lens E, a double convex lens F and a double concave lens G in close contact; the compensation lens group is composed of a double convex lens I, a third cemented group and a positive crescent lens L arranged in order from left to right, the third cemented group is composed of a negative crescent lens J and a double convex lens K in close contact; the rear fixed lens group is composed of a double concave lens M, a plano-convex lens N, a fourth cemented group, a negative crescent lens Q, a fifth cemented group and a filter T arranged in order from left to right, the fourth cemented group is composed of a double concave lens O and a double convex lens P in close contact, and the fifth cemented group is composed of a negative crescent lens R and a double convex lens S in close contact.

[0005] Further, the air gap between the front fixed lens group and the zoom lens group is 55.7mm-93.3mm, the air gap between the zoom lens group and the compensation lens group is 73mm-1.7mm, and the air gap between the compensation lens group and the rear fixed lens group is 25.4mm-61.1mm.

[0006] Further, the air gap between the lenticular lens A and the positive crescent lens B is 0.7mm, the air gap between the positive crescent lens B and the first cemented group is 2.1mm; the air gap between the second cemented group and the negative crescent lens H is 5.0mm, the air gap between the lenticular lens I and the third cemented group is 0.2mm; the air gap between the third cemented group and the positive crescent lens L is 0.1mm, the air gap between the biconcave lens M and the plano-convex lens N is 0.1mm; the air gap between the plano-convex lens N and the fourth cemented group is 78.1mm, the air gap between the fourth cemented group and the negative crescent lens Q is 3.1mm, and the air gap between the negative crescent lens Q and the fifth cemented group is 14.9mm.

[0007] Further, the lens is sequentially provided with a focusing main lens barrel, a main lens barrel and a rear group lens barrel from left to right, the focusing main lens barrel is internally provided with a front group lens barrel, the main lens barrel is internally provided with a variable magnification slide and a compensation slide, the variable magnification slide and the compensation slide are respectively provided with a variable magnification lens barrel and a compensation lens barrel; the front fixed lens group, the variable magnification lens group, the compensation lens group and the rear fixed lens group are respectively installed on the front group lens barrel, the variable magnification lens barrel, the compensation lens barrel and the rear group lens barrel.

[0008] Further, the lens further comprises an electric focusing mechanism, an electric zooming mechanism, a rear fixed assembly and a detector camera assembly, the electric focusing mechanism selects the front fixed lens group as a focusing moving group; the electric zooming mechanism drives the variable magnification lens group and the compensation lens group to do linear reciprocating motion through the variable magnification slide and the compensation slide, so as to complete continuous zooming switching of the lens; the detector camera assembly is installed on the rear fixed lens group.

[0009] Further, the electric focusing mechanism comprises a focusing lens group, a focusing cam and a plurality of focusing guide pin assemblies arranged in the focusing main lens barrel, the focusing cam is installed on the focusing main lens barrel by a focusing cam pressing ring, the focusing cam is provided with a linear inclined groove, the focusing main lens barrel is provided with a straight groove, the focusing guide pin assemblies are used to connect the focusing lens group, the focusing cam and the focusing main lens barrel together, the focusing cam is externally provided with a focusing motor gear engaged with the focusing cam, the focusing motor gear is driven to rotate by a focusing motor, and the focusing cam is externally further provided with a potentiometer and a potentiometer gear.

[0010] Further, the electric zoom mechanism comprises a zoom cam, a zoom pin assembly and a compensation pin assembly arranged on the main lens barrel, the zoom cam is rotationally connected with the main lens barrel, the zoom lens group is installed on the zoom slide through screws to form a zoom assembly, the compensation lens group is installed on the compensation slide through screws to form a compensation assembly, the main lens barrel is provided with a zoom straight groove and a compensation straight groove, the zoom cam is provided with a zoom curve groove and a compensation curve groove respectively, the zoom pin assembly and the compensation pin assembly are connected with the zoom cam and the zoom slide and the compensation slide through the zoom curve groove and the compensation curve groove respectively, the zoom cam is provided with a zoom motor gear and a zoom potentiometer gear respectively, the zoom motor gear and the zoom potentiometer gear are engaged with the zoom cam respectively, the zoom motor gear is driven to rotate by the zoom motor, and the zoom potentiometer gear is connected with the zoom potentiometer, and the zoom potentiometer rotates synchronously with the zoom cam.

[0011] Further, the positive crescent lens B and the lenticular lens K are made of optical glass with ultra-low dispersion.

[0012] Further, an imaging method of the large-target long-focus two-variable high-definition zoom lens is characterized in that light rays sequentially pass through the lenticular lens A, the positive crescent lens B, the first cemented group, the second cemented group, the negative crescent lens H, the lenticular lens I, the third cemented group, the positive crescent lens L, the biconcave lens M, the plano-convex lens N, the fourth cemented group, the negative crescent lens Q, the fifth cemented group and the filter T from left to right to perform imaging.

[0013] Compared with the prior art, the present application has the following beneficial effects: the present application is rationally designed, realizes full-range large-target continuous zooming with a focal length of 291-1119mm, can search and track image shooting of targets at long and short distances and high-speed motion, and is applied to unmanned monitoring, early warning, border and sea defense and other demand scenes; the lens has a wide temperature adaptation range and simultaneously widens the application scene. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is an optical structure schematic diagram of the lens of the embodiment of the present application;

[0015] Figure 2 is a mechanical structure schematic diagram of the lens of the embodiment of the present application;

[0016] Figure 3 is a long-focus MTF diagram of the lens of the embodiment of the present application;

[0017] Figure 4 is a short-focus MTF diagram of the lens of the embodiment of the present application;

[0018] Figure 5 is a structure schematic diagram of the electric focusing mechanism of the lens of the embodiment of the present application; Figure 1 ​

[0019] Figure 6 is the schematic configuration of the electric focusing mechanism of the lens of the embodiment of the present application Figure 2 ;

[0020] Figure 7 is the schematic configuration of the electric zoom mechanism of the lens of the embodiment of the present application Figure 1 ;

[0021] Figure 8 is the schematic configuration of the electric zoom mechanism of the lens of the embodiment of the present application Figure 2 .

[0022] In the figure: 11 - front fixed lens group; 111 - lenticular lens A; 112 - positive meniscus lens B; 113 - negative meniscus lens C; 114 - positive meniscus lens D; 12 - zoom lens group; 121 - negative meniscus lens E; 122 - lenticular lens F; 123 - biconcave lens G; 124 - negative meniscus lens H; 13 - compensation lens group; 131 - lenticular lens I; 132 - negative meniscus lens J; 133 - lenticular lens K; 134 - positive meniscus lens L; 14 - rear fixed lens group; 141 - biconcave lens M; 142 - plano-convex lens N; 143 - biconcave lens O; 144 - lenticular lens P; 145 - negative meniscus lens Q; 146 - negative meniscus lens R; 147 - lenticular lens S; 148 - filter T;

[0023] 16 - electric focusing mechanism; 17 - electric zoom mechanism; 18 - rear fixed group; 19 - detector camera assembly;

[0024] 21 - focusing lens group; 22 - focusing cam pressing ring; 23 - front row of steel balls; 24 - focusing cam; 25 - focusing guide pin assembly; 26 - rear row of steel balls; 27 - focusing main lens barrel; 28 - focusing motor; 29 - focusing micro switch; 210 - focusing motor gear; 211 - limit support; 212 - focusing potentiometer; 213 - focusing potentiometer gear;

[0025] 31 - zoom lens group; 32 - zoom slide; 33 - front precision steel ball; 34 - zoom guide pin assembly; 35 - zoom cam; 36 - main lens barrel; 37 - rear precision steel ball; 38 - zoom cam pressing ring; 39 - compensation lens group; 310 - 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. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0027] Embodiment 1: as Figures 1-8As shown, in the embodiment, a large target surface long focal length two variable high-definition zoom lens is provided, comprising a lens, and an optical system of the lens is composed of a front fixed lens group 11, a variable magnification lens group 12, a compensation lens group 13 and a rear fixed lens group 14 which are sequentially arranged from left to right along the light incident direction.

[0028] The front fixed lens group 11 is composed of a double convex lens A 111, a positive crescent lens B 112 and a first cemented group which are sequentially arranged from left to right, and the first cemented group is composed of a negative crescent lens C 113 and a positive crescent lens D 114.

[0029] The variable magnification lens group 12 is composed of a second cemented group and a negative crescent lens H 124 which are sequentially arranged from left to right, and the second cemented group is composed of a negative crescent lens E 121, a double convex lens F 122 and a double concave lens G 123.

[0030] The compensation lens group 13 is composed of a double convex lens I 131, a third cemented group and a positive crescent lens L 134 which are sequentially arranged from left to right, and the third cemented group is composed of a negative crescent lens J 132 and a double convex lens K 133.

[0031] The rear fixed lens group 14 is composed of a double concave lens M 141, a plano-convex lens N 142, a fourth cemented group, a negative crescent lens Q 145, a fifth cemented group and a filter T 148 which are sequentially arranged from left to right, the fourth cemented group is composed of a double concave lens O 143 and a double convex lens P 144, and the fifth cemented group is composed of a negative crescent lens R 146 and a double convex lens S 147.

[0032] In the embodiment, the air gap between the front fixed lens group 11 and the variable magnification lens group 12 is 55.7mm-93.3mm, the air gap between the variable magnification lens group 12 and the compensation lens group 13 is 73mm-1.7mm, and the air gap between the compensation lens group 13 and the rear fixed lens group 14 is 25.4mm-61.1mm.

[0033] In the embodiment, the air gap between the double convex lens A and the positive crescent lens B is 0.7mm, the air gap between the positive crescent lens B and the first cemented group is 2.1mm, the air gap between the second cemented group and the negative crescent lens H is 5.0mm, the air gap between the double convex lens I and the third cemented group is 0.2mm, the air gap between the third cemented group and the positive crescent lens L is 0.1mm, the air gap between the double concave lens M and the plano-convex lens N is 0.1mm, the air gap between the plano-convex lens N and the fourth cemented group is 78.1mm, the air gap between the fourth cemented group and the negative crescent lens Q is 3.1mm, and the air gap between the negative crescent lens Q and the fifth cemented group is 14.9mm.

[0034] In the embodiment of the present application, the positive meniscus lens B and the lenticular lens K are made of optical glass with ultra-low dispersion; by selecting the optical glass material with ultra-low dispersion, the chromatic aberration of the system is reduced, and the resolution of the system is improved.

[0035] In the embodiment of the present application, when imaging, the light rays pass through the lenticular lens A, the positive meniscus lens B, the first cemented group, the second cemented group, the negative meniscus lens H, the lenticular lens I, the third cemented group, the positive meniscus lens L, the biconcave lens M, the plano-convex lens N, the fourth cemented group, the negative meniscus lens Q, the fifth cemented group, and the filter T in sequence from left to right, and then imaging is performed.

[0036] In the embodiment of the present application, on the basis of the embodiment 1, the optical technical indexes realized by the optical system of the present lens are as follows:

[0037] Focal length: f'min=291mm, f'max=1119mm;

[0038] Relative aperture: 1 / 10.2~1 / 12.2

[0039] Horizontal field of view angle covers 3.16°~1.3°;

[0040] Optical total length ∑L≤400mm;

[0041] Zoom stroke ≤35.6mm.

[0042] In the embodiment of the present application, the initial structure of positive group compensation is selected when selecting the type, which is beneficial to reduce the secondary spectrum aberration of the system and improve the imaging quality at long focus; the material with ultra-low dispersion (such as H-FK61 material) is used in the front fixed group to further reduce the secondary spectrum aberration of the system and improve the resolution level; the glass with high refractive index and low dispersion is selected as the material of the positive lens to reduce the curvature of the refractive surface, which is beneficial to correct the high-order spherical aberration of the on-axis point and the off-axis point; the zoom group and the rear fixed group are appropriately complicated to reduce the image distortion at long focus and short focus, and to reduce the lead of the moving group.

[0043] In the embodiment, the specific design parameters of each lens (the front fixed lens group 11, the zoom lens group 12, the compensation lens group 13, and the rear fixed lens group 14) of the optical system are shown in the following table 1:

[0044]

[0045] Table 1

[0046] In the embodiment of the present application, the lens further comprises an electric focusing mechanism 16, an electric zooming mechanism 17, a rear fixed assembly 18 and a detector camera assembly 19. The electric focusing mechanism selects the front fixed lens group as the focusing moving group. The electric zooming mechanism drives the zooming lens group and the compensating lens group to do linear reciprocating motion through the zooming slide and the compensating slide, so as to complete the continuous zooming switching of the lens. The detector camera assembly is installed on the rear fixed lens group.

[0047] In the embodiment of the present application, the electric focusing mechanism comprises a focusing lens group, a focusing cam and a plurality of focusing guide pin assemblies arranged in the focusing main lens barrel. The focusing cam is installed on the focusing main lens barrel by a focusing cam pressing ring. The focusing cam has a linear inclined groove thereon. The focusing main lens barrel has a straight groove thereon. The focusing guide pin assemblies are used to connect the focusing lens group, the focusing cam and the focusing main lens barrel together. The focusing cam is externally provided with a focusing motor gear engaged with the focusing cam. The focusing motor gear is driven to rotate by a focusing motor. The focusing cam is externally further provided with a potentiometer and a potentiometer gear.

[0048] In the embodiment of the present application, as shown in Figure 5 , 6 The electric focusing mechanism selects the lenses of the optical system front fixed group to form the focusing lens group 21. The focusing lens group 21 is installed in the focusing main lens barrel 27 by grinding fit. The focusing cam 24 is installed on the focusing main lens barrel 27 and is pressed tightly by the focusing cam pressing ring 22. The focusing cam 24 is milled with a linear inclined groove according to optical requirements. The focusing main lens barrel 27 is milled with a straight groove. Three 120° uniformly distributed focusing guide pin assemblies 25 are used to connect the focusing lens group 21, the focusing cam 24 and the focusing main lens barrel 27 together. The focusing motor gear 210 is engaged with the gear on the focusing cam 24.

[0049] The electric focusing mechanism selects the lenses of the optical system front fixed group to form the focusing lens group 21. The focusing lens group 21 is installed in the focusing main lens barrel 27 by grinding fit. The focusing cam 24 is installed on the focusing main lens barrel 27 and is pressed tightly by the focusing cam pressing ring 22. The focusing cam 24 is milled with a linear inclined groove according to optical requirements. The focusing main lens barrel 27 is milled with a straight groove. Three 120° uniformly distributed focusing guide pin assemblies 25 are used to connect the focusing lens group 21, the focusing cam 24 and the focusing main lens barrel 27 together. The focusing motor gear 210 is engaged with the gear on the focusing cam 24.

[0050] When the focusing motor 28 is energized and rotates, driving the focusing cam 24 to rotate, the rotational motion of the focusing lens group 21 is converted into linear motion by the straight groove on the focusing main lens barrel 27, thereby achieving focusing on targets at different distances. When focusing on targets at different distances, the focusing potentiometer gear 213 meshes with the gear part on the outer periphery of the focusing cam and the focusing motor gear 210, driving the shaft of the focusing potentiometer 212 to rotate, causing a change in the resistance value of the focusing potentiometer 212. The change value of the focusing potentiometer 212 can be read through an appropriate sampling circuit and transmitted to the control center, thereby realizing the display of the focusing distance value; conversely, the focusing distance value can be controlled in real time by issuing a command through the control center.

[0051] The main lens barrel is also provided with a limiting bracket 211, and the limiting bracket 211 is provided with a focusing micro switch 29.

[0052] In embodiments of the present invention, such as Figure 7 , 8 As shown, the electric zoom mechanism includes a zoom cam, a zoom guide pin assembly, and a compensation guide pin assembly mounted on the main lens barrel. The zoom cam rotates with the main lens barrel. The zoom lens assembly 31 is mounted on the zoom slide 32 by screws to form a zoom assembly. The compensation lens assembly 39 is mounted on the compensation slide 310 by screws to form a compensation assembly. The main lens barrel is provided with a zoom straight groove and a compensation straight groove. The zoom cam is provided with a zoom curve groove and a compensation curve groove. The zoom guide pin assembly and the compensation guide pin assembly connect the zoom cam to the zoom slide and the compensation slide through the zoom curve groove and the compensation curve groove, respectively. A zoom motor gear and a zoom potentiometer gear are respectively provided on the outside of the zoom cam. The zoom motor gear and the zoom potentiometer gear mesh with the zoom cam. The zoom motor gear is driven to rotate by the zoom motor. A zoom potentiometer is connected to the zoom potentiometer gear and rotates synchronously with the zoom cam.

[0053] The aforementioned main lens barrel is equipped with a zoom micro switch 312 and a zoom limit pin 313.

[0054] The aforementioned zoom slide 32 and compensation slide 310 are respectively installed into the main lens barrel 36 after being ground and fitted together. The zoom cam 35 is mounted on the main lens barrel 36 through the front precision steel ball 33 and the rear precision steel ball 37, and is pressed by the zoom cam pressure ring 38 to form a rolling bearing structure, which converts the sliding friction when the zoom cam 35 rotates into rolling friction, thereby reducing the friction force when the zoom cam 35 moves.

[0055] The zoom cam 35 is milled with zoom and compensation curve grooves according to the requirements of the optical zoom motion equation. Then, the zoom cam 35 is connected to the zoom slide 32 and the compensation slide 310 by the zoom guide pin assembly 34 and the compensation guide pin assembly 311.

[0056] The variable magnification motor gear 317 and the zoom potentiometer gear 316 are respectively engaged with the gear of the zoom cam 35. When the variable magnification motor 315 rotor rotates positively or negatively, the zoom potentiometer 314 rotates synchronously with the zoom cam 35. The variable magnification carriage 32 and the compensation carriage 310 are driven to move along the variable magnification curve groove and the compensation curve groove by the variable magnification guide pin assembly 34 and the compensation guide pin assembly 311.

[0057] The two straight grooves (variable magnification straight groove and compensation straight groove) on the main lens barrel 36 support the variable magnification guide pin assembly 34 and the compensation guide pin assembly 311, and change the rotation of the variable magnification carriage 32 and the compensation carriage 310 into linear motion. By strictly controlling the cooperation gap between the variable magnification guide pin assembly 34 and the compensation guide pin assembly 311 and the curve groove of the zoom cam 35 and the straight groove of the main lens barrel 36, the variable magnification and compensation assemblies are ensured to slide smoothly and comfortably without jamming.

[0058] The variable magnification assembly and the compensation assembly are driven to move forward and backward along the zoom motion equation by the rotation of the variable magnification motor 315, so as to realize the continuous variable function of the system focal length. When the focal length of the system changes, the zoom potentiometer gear 316 is engaged with the gear of the zoom cam 35, so that the zoom potentiometer 314 rotates. Then the resistance of the zoom potentiometer 314 changes, and the change value of the zoom potentiometer 314 can be obtained by a proper sampling circuit and transmitted to the control center, so as to realize the display of the focal length value. Conversely, the real-time control of the focal length can be realized by giving a command from the control center.

[0059] Any technical solution disclosed in the above application, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only one of the many implementable values with more obvious technical effects or representative values. Since there are too many values to enumerate, the application discloses some values to illustrate the technical solutions of the application, and the above-mentioned values should not constitute a limitation on the protection scope of the application.

[0060] Meanwhile, if the above application discloses or involves mutually fixed and connected parts or structural members, unless otherwise stated, the fixed connection can be understood as being able to be disassembled and fixedly connected (for example, connected by using bolts or screws), and can also be understood as being fixedly connected and not being disassembled (for example, riveting, welding), of course, the mutually fixed connection can also be replaced by an integral structure (for example, integrally formed by using casting process) (obviously, except for the integral forming process).

[0061] If the terms "first", "second" or the like are used herein to describe individual elements, those skilled in the art should understand that these terms are merely used to distinguish one element from another, and do not necessarily have a special meaning.

[0062] In addition, the terms used to represent the positional relationship or shape in any of the technical solutions disclosed herein include the approximate, similar or close state or shape unless otherwise stated.

[0063] Any of the components provided by the present application can be assembled from multiple individual components or manufactured as a single component by one-piece forming process.

[0064] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A large target surface long focal length two variable high definition zoom lens, characterized in that, The lens comprises an optical system composed of a front fixed lens group, a zoom lens group, a compensation lens group and a rear fixed lens group arranged in sequence from left to right along the light incident direction; the front fixed lens group, the zoom lens group and the compensation lens group are movable; the front fixed lens group is composed of a double convex lens A, a positive half-moon lens B and a first cemented group arranged in sequence from left to right, the first cemented group is composed of a negative half-moon lens C and a positive half-moon lens D; the zoom lens group is composed of a second cemented group and a negative half-moon lens H arranged in sequence from left to right, the second cemented group is composed of a negative half-moon lens E, a double convex lens F and a double concave lens G; the compensation lens group is composed of a double convex lens I, a third cemented group and a positive half-moon lens L arranged in sequence from left to right, the third cemented group is composed of a negative half-moon lens J and a double convex lens K; the rear fixed lens group is composed of a double concave lens M, a plano-convex lens N, a fourth cemented group, a negative half-moon lens Q, a fifth cemented group and a filter T arranged in sequence from left to right, the fourth cemented group is composed of a double concave lens O and a double convex lens P, the fifth cemented group is composed of a negative half-moon lens R and a double convex lens S; The air gap between the front fixed lens group and the zoom lens group is 55.7mm-93.3mm, the air gap between the zoom lens group and the compensation lens group is 73mm-1.7mm, and the air gap between the compensation lens group and the rear fixed lens group is 25.4mm-61.1mm.

2. The large-format long focal length dual-variator high-definition zoom lens of claim 1, wherein, The air gap between the double convex lens A and the positive half-moon lens B is 0.7mm, the air gap between the positive half-moon lens B and the first cemented group is 2.1mm; the air gap between the second cemented group and the negative half-moon lens H is 5.0mm, the air gap between the double convex lens I and the third cemented group is 0.2mm; the air gap between the third cemented group and the positive half-moon lens L is 0.1mm, the air gap between the double concave lens M and the plano-convex lens N is 0.1mm; the air gap between the plano-convex lens N and the fourth cemented group is 78.1mm, the air gap between the fourth cemented group and the negative half-moon lens Q is 3.1mm, and the air gap between the negative half-moon lens Q and the fifth cemented group is 14.9mm.

3. The large-format, long focal length, two-variable, high definition zoom lens of claim 1, wherein, The lens is provided with a focusing main lens barrel, a main lens barrel and a rear group lens barrel arranged in sequence from left to right, the inside of the focusing main lens barrel is provided with a front group lens barrel, the inside of 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 installed on the front group lens barrel, the zoom lens barrel, the compensation lens barrel and the rear group lens barrel.

4. The large-format, long focal length, two-variable, high definition zoom lens of claim 3, wherein, The lens further comprises an electric focusing mechanism, an electric zoom mechanism, a rear fixed assembly and a detector camera assembly, the electric focusing mechanism selects the front fixed lens group as a focusing moving group; the electric zoom mechanism drives the zoom lens group and the compensation lens group to do linear reciprocating motion through the zoom slide and the compensation slide to complete continuous zoom switching of the lens; the detector camera assembly is installed on the rear fixed lens group.

5. The large-format, long focal length, two-variable, high definition zoom lens of claim 4, wherein, The electric focusing mechanism comprises a focusing lens group, a focusing cam and focusing guide pin assemblies arranged in a focusing main lens barrel, the focusing cam is installed on the focusing main lens barrel by a focusing cam pressing ring, the focusing cam has a linear inclined groove, the focusing main lens barrel is provided with a straight groove, the focusing guide pin assemblies are used to connect the focusing lens group, the focusing cam and the focusing main lens barrel together, the focusing cam is provided with a focusing motor gear outside and engaged with the focusing cam, the focusing motor gear is driven to rotate by a focusing motor, and the focusing cam is further provided with a potentiometer and a potentiometer gear outside.

6. A large-format, long focal length, two-variable, high definition zoom lens according to claim 4, wherein, The electric zoom mechanism comprises a zoom cam, zoom guide pin assemblies and compensation guide pin assemblies arranged on a main lens barrel, the zoom cam is rotationally connected with the main lens barrel, a zoom lens group is installed on a zoom slide by screws to form a zoom assembly, a compensation lens group is installed on a compensation slide by screws to form a compensation assembly, the main lens barrel is provided with a zoom straight groove and a compensation straight groove, the zoom cam is provided with a zoom curved groove and a compensation curved groove respectively, the zoom guide pin assemblies and the compensation guide pin assemblies are used to connect the zoom cam with the zoom slide and the compensation slide respectively through the zoom curved groove and the compensation curved groove, the zoom cam is provided with a zoom motor gear and a zoom potentiometer gear outside respectively, the zoom motor gear and the zoom potentiometer gear are engaged with the zoom cam respectively, the zoom motor gear is driven to rotate by a zoom motor, and the zoom potentiometer gear is connected with a zoom potentiometer, the zoom potentiometer rotates synchronously with the zoom cam.

7. The large-format, long focal length, two-variable, high definition zoom lens of claim 1, wherein, The positive meniscus lens B and the lenticular lens K are made of optical glass with ultra-low dispersion.

8. An imaging method for a large-area, long-focal-length dual variable high-definition zoom lens as described in any one of claims 1 to 7, characterized in that, Light rays pass through the lenticular lens A, the positive meniscus lens B, the first cemented group, the second cemented group, the negative meniscus lens H, the lenticular lens I, the third cemented group, the positive meniscus lens L, the biconcave lens M, the plano-convex lens N, the fourth cemented group, the negative meniscus lens Q, the fifth cemented group and the filter T in sequence from left to right to form an image.

Images