Large-target-surface long-focal-length two-variable high-definition zoom lens

Abstract

The utility model relates to a large-target-surface long-focal-length two-variable high-definition zoom lens, which comprises a lens, and an optical system of the lens comprises a front fixed lens group, a zoom lens group, a compensating lens group and a rear fixed lens group which are sequentially arranged from left to right along a light incidence direction. According to the utility model, the design is reasonable, a continuous zoom closed-loop control function, a focusing closed-loop control function, a focal length feedback function and an image output function are realized, large-range searching and tracking camera shooting can be carried out on targets with far and near distances and high-speed movement, and the system is applied to scenes with requirements such as unmanned monitoring, early warning, marginal and coast defense and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a big target surface long focus length two variable high definition zoom lens. BACKGROUND

[0002] In the visible light imaging system, have the precise long focus length zoom, high accuracy, image requirement smooth when working operation optical lens, can be applicable to wide temperature change range simultaneously, compared with traditional zoom optical lens, in unmanned monitoring, early warning, border defense etc. UTILITY MODEL CONTENTS

[0003] The utility model improves above -mentioned problem, that is, the technical problem that the utility model solves is to provide a big target surface long focus length two variable high definition zoom lens, reasonable in design realizes 300mm to 1100mm big target surface continuous zoom, widens application scene.

[0004] The utility model is such a constitution, it includes the lens, the optical system of lens is by the front fixed mirror group, the variable multiple lens group, the compensation mirror group and the rear fixed mirror group that are sequentially arranged from left to right along the light incidence direction is composed, the front fixed mirror group is by the bi-convex lens A, the positive crescent lens B and the first cementation group that are sequentially arranged from left to right is composed, the first cementation group is by negative crescent lens C and positive crescent lens D close together, the variable multiple lens group is by the second cementation group and negative crescent lens H that are sequentially arranged from left to right is composed, the second cementation group is by negative crescent lens E, bi-convex lens F and biconcave lens G close together, the compensation mirror group is by the bi-convex lens I, the third cementation group and the positive crescent lens L that are sequentially arranged from left to right is composed, the third cementation group is by negative crescent lens J and bi-convex lens K close together, the rear fixed mirror group is by the biconcave lens M, the plane convex lens N, the fourth cementation group, negative crescent lens Q, the fifth cementation group and the optical filter T that are sequentially arranged from left to right is composed, the fourth cementation group is by biconcave lens O and bi-convex lens P close together, the fifth cementation group is by negative crescent lens R and bi-convex lens S close together.

[0005] Further, the air interval between the front fixed mirror group and the variable multiple lens group is 55.7mm-93.3mm, the air interval between the variable multiple lens group and the compensation mirror group is 73mm-1.7mm, and the air interval between the compensation mirror group and the rear fixed mirror 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 guide pin assembly and a compensation guide pin assembly arranged on the main lens barrel, the zoom cam is rotationally fitted 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 respectively provided with a zoom curve groove and a compensation curve groove, the zoom guide pin assembly and the compensation guide pin assembly are connected together through the zoom curve groove and the compensation curve groove, the zoom cam is respectively provided with a zoom motor gear and a zoom potentiometer gear, the zoom motor gear and the zoom potentiometer gear are respectively engaged with the zoom cam, the zoom motor gear is driven to rotate by a zoom motor, and the zoom potentiometer gear is connected with a zoom potentiometer, and the zoom potentiometer rotates synchronously with the zoom cam.

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

[0012] Compared with the prior art, the utility model has the advantages that the utility model discloses the design is reasonable, realizes the focal length 291-1119mm full -range big target surface continuous zooming, can search, track and photograph the target of far and near distance and high -speed motion in a wide range, is applied to unmanned monitoring, early warning, border sea defense and other demand scene, the lens has wide temperature adaptation range, and simultaneously widens the application scene. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the optical structure schematic diagram of the lens of the utility model embodiment;

[0014] Figure 2 It is the mechanical structure schematic diagram of the lens of the utility model embodiment;

[0015] Figure 3 It is the long -focus MTF graph of the lens of the utility model embodiment;

[0016] Figure 4 It is the short -focus MTF graph of the lens of the utility model embodiment;

[0017] Figure 5 It is the structure schematic diagram of the electric focusing mechanism of the lens of the utility model embodiment Figure 1 ;

[0018] Figure 6 It is the structure schematic diagram of the electric focusing mechanism of the lens of the utility model embodiment Figure 2 ;

[0019] Figure 7 It is the structure schematic diagram of the electric zoom mechanism of the lens of the utility model embodiment Figure 1 ;

[0020] Figure 8 This is a schematic diagram of the electric zoom mechanism of the lens in an embodiment of this utility model. Figure 2 .

[0021] In the diagram: 11-Front fixed lens group; 111-Biconvex 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-Biconvex lens F; 123-Biconcave lens G; 124-Negative meniscus lens H; 13-Compensation lens group; 131-Biconvex lens I; 132-Negative meniscus lens J; 133-Biconvex 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-Biconvex lens P; 145-Negative meniscus lens Q; 146-Negative meniscus lens R; 147-Biconvex lens S; 148-Filter T;

[0022] 16-Electric focusing mechanism; 17-Electric zoom mechanism; 18-Rear fixed assembly; 19-Detector camera assembly;

[0023] 21-Focusing lens group; 22-Focusing cam pressure 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 bracket; 212-Focusing potentiometer; 213-Focusing potentiometer gear;

[0024] 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 retaining 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 Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: As Figures 1-8 As shown, in this embodiment, a large target area long focal length dual variable high-definition zoom lens is provided, including a lens. The optical system of the lens consists of a front fixed lens group 11, a zoom lens group 12, a compensation lens group 13 and a rear fixed lens group 14 arranged sequentially from left to right along the light incident direction.

[0027] The front fixed lens group 11 is composed of a lenticular lens A 111, a positive meniscus lens B 112 and a first cemented group arranged from left to right, the first cemented group is composed of a negative meniscus lens C 113 and a positive meniscus lens D 114 in close contact;

[0028] The variable magnification lens group 12 is composed of a second cemented group and a negative meniscus lens H 124 arranged from left to right, the second cemented group is composed of a negative meniscus lens E 121, a lenticular lens F 122 and a biconcave lens G 123 in close contact;

[0029] The compensation lens group 13 is composed of a lenticular lens I 131, a third cemented group and a positive meniscus lens L 134 arranged from left to right, the third cemented group is composed of a negative meniscus lens J 132 and a lenticular lens K 133 in close contact;

[0030] The rear fixed lens group 14 is composed of a biconcave lens M 141, a plano-convex lens N 142, a fourth cemented group, a negative meniscus lens Q 145, a fifth cemented group and a filter T 148 arranged from left to right, the fourth cemented group is composed of a biconcave lens O 143 and a lenticular lens P 144 in close contact, and the fifth cemented group is composed of a negative meniscus lens R 146 and a lenticular lens S 147 in close contact.

[0031] In the embodiment of the utility model, the air interval between the front fixed lens group 11 and the variable magnification lens group 12 is 55.7mm-93.3mm, the air interval between the variable magnification lens group 12 and the compensation lens group 13 is 73mm-1.7mm, and the air interval between the compensation lens group 13 and the rear fixed lens group 14 is 25.4mm-61.1mm.

[0032] In the embodiment of the utility model, the air interval between the lenticular lens A and the positive meniscus lens B is 0.7mm, the air interval between the positive meniscus lens B and the first cemented group is 2.1mm, the air interval between the second cemented group and the negative meniscus lens H is 5.0mm, the air interval between the lenticular lens I and the third cemented group is 0.2mm, the air interval between the third cemented group and the positive meniscus lens L is 0.1mm, the air interval between the biconcave lens M and the plano-convex lens N is 0.1mm, the air interval between the plano-convex lens N and the fourth cemented group is 78.1mm, the air interval between the fourth cemented group and the negative meniscus lens Q is 3.1mm, and the air interval between the negative meniscus lens Q and the fifth cemented group is 14.9mm.

[0033] In the embodiment of the utility model, the positive meniscus lens B and the lenticular lens K are made of super low dispersion optical glass, by selecting the super low dispersion optical glass material, the chromatic aberration of the system is reduced, and the system resolution is improved.

[0034] In the embodiment of the utility model, when imaging: light rays pass through the double convex lens A, the positive crescent lens B, the first cemented group, the second cemented group, the negative crescent lens H, the double convex lens I, the third cemented group, the positive crescent lens L, the double concave lens M, the flat convex lens N, the fourth cemented group, the negative crescent lens Q, the fifth cemented group and the filter T in turn from left to right and then image.

[0035] In the embodiment, the optical technical indexes realized by the optical system of the lens are as follows:

[0036] Focal length: f' min=291mm, f' max=1119mm;

[0037] Relative aperture: 1 / 10.2~1 / 12.2

[0038] Horizontal field angle covers 3.16°~1.3°;

[0039] Optical total length ∑L≤400mm;

[0040] Zoom stroke ≤35.6mm.

[0041] In the embodiment of the utility model, the initial structure of positive compensation is selected when selecting the type, and the structure is beneficial to reducing the secondary spectrum of the system and improving the imaging quality in the long focus; the super low dispersion material (such as H-FK61 material) is used in the front fixed group to further reduce the secondary spectrum of the system and improve the resolution level; the high refractive index and low dispersion glass is selected as the material of the positive lens, so that the curvature of the refractive surface is reduced, which is beneficial to correcting 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, the image distortion of the long focus and the short focus is reduced, and the lead of the moving group is reduced.

[0042] 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:

[0043]

[0044] Table 1

[0045] In the embodiment, 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 front group lens barrel is arranged in the focusing main lens barrel, the zoom slide and the compensation slide are arranged in the main lens barrel, the zoom lens barrel and the compensation lens barrel are respectively arranged on the zoom slide and the compensation slide; the front fixed lens group, the zoom lens group, the compensation lens group and the rear fixed lens group are respectively arranged on the front group lens barrel, the zoom lens barrel, the compensation lens barrel and the rear group lens barrel.

[0046] In the embodiment of the utility model, the lens still includes electric focusing mechanism 16, electric zoom mechanism 17, rear fixed component 18 and detector camera component 19, the electric focusing mechanism selects the front fixed mirror group as the focusing movement group, the electric zoom mechanism drives the zoom lens group and the compensation lens group to do linear reciprocating motion through the variable magnification slide and the compensation slide respectively, to complete the lens continuous zoom switching, the detector camera component is installed on the rear fixed mirror group.

[0047] In the embodiment of the utility model, as shown in Figure 5 、 6 The electric focusing mechanism includes focusing lens group, focusing cam and several focusing guide nail components arranged in focusing main lens barrel, the focusing cam adopts focusing cam pressure ring and is installed on the focusing main lens barrel, the focusing cam has linear inclined groove, the focusing main lens barrel is equipped with straight groove, the focusing guide nail component is used for connecting the focusing lens group, the focusing cam and the focusing main lens barrel together, the focusing cam is externally provided with focusing motor gear meshed with it, the focusing motor gear is driven to rotate by focusing motor, the focusing cam is externally provided with potentiometer and potentiometer gear.

[0048] The electric focusing mechanism selects the lens of optical system front fixed group to form focusing lens group 21, the focusing lens group 21 is installed in the focusing main lens barrel 27 through grinding cooperation with the focusing main lens barrel 27, the focusing cam 24 is installed on the focusing main lens barrel 27 and is pressed tightly by focusing cam pressure ring 22, the focusing cam 24 is milled on linear inclined groove according to optical requirements, the focusing main lens barrel 27 is milled on straight groove, three 120 ° evenly distributed focusing guide nail components 25 are used to connect the focusing lens group 21 with the focusing cam 24 and the focusing main lens barrel 27 together, focusing motor gear 210 is engaged with the gear on the focusing cam 24.

[0049] When the focusing motor 28 is powered and rotated, the rotation of the focusing cam 24 is limited by the straight groove on the focusing main lens barrel 27, and the rotary motion of the focusing lens group 21 is converted into linear motion, so that the focusing of the near and far targets is realized.

[0050] The above-mentioned main lens barrel is further provided with a limiting support 211, and the limiting support 211 is provided with a focusing microswitch 29.

[0051] In the embodiment of the utility model, as shown in Figure 7 、 8As shown, the electric zoom mechanism includes a zoom cam, a zoom guide pin assembly and a compensation guide pin assembly arranged on the main lens barrel, the zoom cam is rotationally fitted with the main lens barrel, the zoom lens group 31 is installed on the zoom slide 32 through a screw to form a zoom assembly, the compensation lens group 39 is installed on the compensation slide 310 through a screw to form a compensation assembly, the main lens barrel is provided with a zoom straight slot and a compensation straight slot, the zoom cam is respectively provided with a zoom curve slot and a compensation curve slot, the zoom guide pin assembly and the compensation guide pin assembly are connected together through the zoom curve slot and the compensation curve slot, the zoom cam is respectively provided with a zoom motor gear and a zoom potentiometer gear, the zoom motor gear and the zoom potentiometer gear are respectively engaged with the zoom cam, 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.

[0052] The main lens barrel is provided with a zoom micro switch 312 and a zoom limiting pin 313.

[0053] The zoom slide 32 and the compensation slide 310 are respectively installed in the main lens barrel 36 after being ground-fitted with the main lens barrel 36, the zoom cam 35 is installed on the main lens barrel 36 through the front precision ball 33 and the rear precision ball 37, and is pressed tightly by the zoom cam pressing ring 38 to form a rolling bearing structure, so that the sliding friction of the zoom cam 35 is converted into rolling friction when the zoom cam 35 rotates, thereby reducing the friction force when the zoom cam 35 moves.

[0054] The zoom cam 35 is respectively milled with a zoom curve slot and a compensation curve slot according to the requirement of an optical zoom motion equation, and then the zoom cam 35 is connected with the zoom slide 32 and the compensation slide 310 through the zoom guide pin assembly 34 and the compensation guide pin assembly 311.

[0055] The zoom motor gear 317 and the zoom potentiometer gear 316 are respectively engaged with the gear of the zoom cam 35. When the rotor of the zoom motor 315 rotates positively or negatively, the zoom potentiometer 314 rotates synchronously with the zoom cam 35. The zoom slide 32 and the compensation slide 310 are driven to move according to the zoom curve slot and the compensation curve slot through the zoom guide pin assembly 34 and the compensation guide pin assembly 311.

[0056] The two straight slots (zoom straight slot and compensation straight slot) on the main lens barrel 36 play a role in supporting the zoom guide pin assembly 34 and the compensation guide pin assembly 311, and the rotational motion of the zoom slide 32 and the compensation slide 310 is changed into linear motion, and by strictly controlling the fitting gap between the zoom guide pin assembly 34, the compensation guide pin assembly 311, the curve slots of the zoom cam 35 and the straight slots of the main lens barrel 36, the sliding of the zoom assembly and the compensation assembly is smooth and comfortable without jamming.

[0057] The zooming motor 315 is rotated to realize the front and back linear motion of the zooming assembly and the compensation assembly according to the zooming motion equation, so that the continuous variable function of the system focal length is realized. When the focal length of the system changes, the zooming potentiometer gear 316 meshes with the zooming cam 35 gear, so that the zooming potentiometer 314 is rotated, and then the resistance value of the fine zooming potentiometer 314 changes. The change value of the fine zooming potentiometer 314 can be taken out through a proper sampling circuit and transmitted to the control center, so that the display of the focal length value is realized. Conversely, through the command given by the control center, the real-time control of the focal length can be realized.

[0058] Any of the technical solutions disclosed in the utility model above, if not 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. Because there are too many values, it is impossible to enumerate them all, so the utility model discloses only part of the values to illustrate the technical solutions of the utility model, and the values listed above should not constitute a limitation on the protection scope of the utility model.

[0059] Meanwhile, if the utility model above discloses or involves mutually fixedly connected parts or structural members, the fixed connection can be understood as being capable of being detachably fixedly connected (for example, connected by using bolts or screws), or being understood as being fixedly connected and incapable of being detached (for example, being riveted or welded), of course, the mutually fixed connection can also be replaced by an integral structure (for example, manufactured by using a casting process to be integrally formed), except that the integral forming process obviously cannot be adopted.

[0060] If the terms "first", "second", etc. are used to limit the parts in this document, those skilled in the art should know that the use of "first", "second" is only for the convenience of distinguishing the parts, and the above terms have no special meaning unless otherwise stated.

[0061] In addition, the terms used to represent the positional relationship or shape in any of the technical solutions disclosed in the utility model above include states or shapes similar, analogous or close to them, unless otherwise stated.

[0062] Any of the parts provided by the utility model can be assembled from a plurality of individual components, or can be an individual component manufactured by an integral forming process.

[0063] It should be noted that the above examples are 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 be modified or some technical features can be replaced by equivalent ones; 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, which comprises, from left to right along the light incident direction, a front fixed lens group, a zoom lens group, a compensation lens group and a rear fixed lens group; the front fixed lens group comprises, from left to right, a lenticular lens A, a positive half-moon lens B and a first cemented group; the zoom lens group comprises, from left to right, a second cemented group and a negative half-moon lens H; the compensation lens group comprises, from left to right, a lenticular lens I, a third cemented group and a positive half-moon lens L; and the rear fixed lens group comprises, from left to right, a biconcave 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.

2. The large-format long focal length dual-variator high-definition zoom lens of claim 1, wherein, The first cemented group is formed by a negative half-moon lens C and a positive half-moon lens D; the second cemented group is formed by a negative half-moon lens E, a lenticular lens F and a biconcave lens G; the third cemented group is formed by a negative half-moon lens J and a lenticular lens K; the fourth cemented group is formed by a biconcave lens O and a lenticular lens P; and the fifth cemented group is formed by a negative half-moon lens R and a lenticular lens S.

3. The large-format, long focal length, two-variable, high definition zoom lens of claim 1, wherein, 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.

4. The large-format, long focal length, two-variable, high definition zoom lens of claim 1, wherein, The air gap between the lenticular 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 lenticular 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 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 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.

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

6. The large-format, long focal length, two-variable, high definition zoom lens of claim 1, wherein, The lens comprises, from left to right, a focusing main lens barrel, a main lens barrel and a rear group lens barrel, 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, and 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.

7. The large-format, long focal length, two-variable, high definition zoom lens of claim 6, 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, and the detector camera assembly is installed on the rear fixed lens group.

8. The large-format, long focal length, two-variable, high definition zoom lens of claim 7, 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.

9. The large-format, long focal length, two-variable, high definition zoom lens of claim 7, wherein, The electric zoom mechanism comprises a zoom cam, a zoom guide pin assembly and a compensation guide pin assembly arranged on a main lens barrel, the zoom cam is rotationally fitted 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 assembly and the compensation guide pin assembly are used to connect the zoom cam with the zoom slide and the compensation slide together through the zoom curved groove and the compensation curved groove respectively, 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, and the zoom potentiometer rotates synchronously with the zoom cam.

Images