A full-frame unmanned aerial vehicle aerial lens

Abstract

The application discloses a full-frame unmanned aerial vehicle aerial camera lens, characterized in that, from the object side to the image side, a first lens G1 with negative focal length, a second lens G2 with positive focal length, a third lens G3 with negative focal length, a fourth lens G4 with positive focal length, a diaphragm shutter STO, a fifth lens G1 with positive focal length, a sixth lens G1 with negative focal length, a seventh lens G1 with negative focal length and a protective glass CG are sequentially arranged, compared with the prior art, the application improves the frame, imaging picture and shooting range of the unmanned aerial vehicle aerial camera lens, and reduces the distortion, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicles, and particularly relates to a full-frame unmanned aerial vehicle aerial camera lens. BACKGROUND

[0002] With the development of society and the progress of technology, optical imaging lenses are widely used in vehicle-mounted, security, video conferencing, face recognition, machine vision and other fields. Among them, the aerial camera lens for unmanned aerial vehicles has the characteristics of low price, convenient carrying and various viewing angles.

[0003] However, the existing unmanned aerial vehicle aerial camera lenses on the market generally have the following defects:

[0004] The camera frame is small, the shooting range is narrow, and the imaging frame is small;

[0005] Most of them use a plurality of long-focus lenses to splice imaging, which is easy to cause color difference and purple edge phenomenon, affecting the image quality;

[0006] The number of lens module elements is large, which affects the counterweight and the price is high. SUMMARY

[0007] The main purpose of the present application is to provide a full-frame unmanned aerial vehicle aerial camera lens, which aims to improve the frame, imaging frame and shooting range of the unmanned aerial vehicle aerial camera lens, and reduce distortion.

[0008] To achieve the above purpose, the present application provides a full-frame unmanned aerial vehicle aerial camera lens, which is sequentially provided from the object side to the image side: a first lens G1 with negative refractive power, a second lens G2 with positive refractive power, a third lens G3 with negative refractive power, a fourth lens G4 with positive refractive power, a diaphragm shutter STO, a fifth lens G1 with positive refractive power, a sixth lens G1 with negative refractive power, a positive lens G1 with negative refractive power, and a protective glass CG.

[0009] Among them, the refractive index of the first lens G1 is 1.5 < Nd1 < 1.8, and the Abbe number is 30 < Vd1 < 50;

[0010] The refractive index of the second lens G2 is 1.8 < Nd2 < 2.0, and the Abbe number is 20 < Vd2 < 35;

[0011] The refractive index of the third lens G3 is 1.5 < Nd3 < 1.8, and the Abbe number is 30 < Vd3 < 50;

[0012] The refractive index of the fourth lens G4 is 1.4 < Nd4 < 1.8, and the Abbe number is 80 < Vd4 < 95;

[0013] The refractive index of the fifth lens G5 is 1.8 < Nd5 < 2.0, and the Abbe number is 30 < Vd5 < 50;

[0014] The refractive index of the sixth lens G6 is 1.5 < Nd6 < 1.8, and the Abbe number is 25 < Vd6 < 40;

[0015] The refractive index of the seventh lens G7 is 1.8 < Nd7 < 2.0, and the Abbe number is 30 < Vd7 < 50.

[0016] A further technical solution of the present application is that the third lens G3 and the fourth lens G4 constitute a first cemented lens JHG1, and the fifth lens G5 and the sixth lens G6 constitute a second cemented lens JHG2.

[0017] A further technical solution of the present application is that the first cemented lens JHG1 is composed of the image side surface of the third lens G3 and the object side surface of the fourth lens G4, the image side surface of the third lens G3 is a concave surface, and the object side surface of the fourth lens G4 is a convex surface.

[0018] A further technical solution of the present application is that the second cemented lens JHG2 is composed of the image side surface of the fifth lens G5 and the object side surface of the sixth lens G6, the image side surface of the fifth lens G5 is a concave surface, and the object side surface of the sixth lens G6 is a convex surface.

[0019] A further technical solution of the present application is that the first lens G1 is a meniscus lens, which is used to collect light rays of an outer field of view, reduce the projection height of the light rays, and reduce the difficulty of aberration correction.

[0020] A further technical solution of the present application is that the back focus of the full-frame unmanned aerial vehicle aerial lens is greater than 28 mm, and the effective aperture of the first lens G1 is greater than 28 mm.

[0021] A further technical solution of the present application is that the focal length f of the full-frame unmanned aerial vehicle aerial lens is 40 mm.

[0022] A further technical solution of the present application is that the aperture F / # of the full-frame unmanned aerial vehicle aerial lens is F / 5.6.

[0023] A further technical solution of the present application is that the total length TTL of the full-frame unmanned aerial vehicle aerial lens is less than 65 mm.

[0024] The full-frame unmanned aerial vehicle aerial lens of the present application has the following beneficial effects:

[0025] 1. The maximum imaging height is 46 mm, which can cover the full frame, the imaging picture is large, and the shooting range is wide;

[0026] 2. The chromatic aberration is corrected for 436-656nm, the overall chromatic aberration is less than 5um, and the purple edge and color imbalance phenomenon will not appear in the shooting picture;

[0027] 3. The distortion is less than 1%, and the shooting picture will not appear distortion phenomenon, and the restoration degree of the object is high. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0029] Figure 1 is a structure diagram of a preferred embodiment of the full-frame unmanned aerial vehicle aerial camera lens of the present application;

[0030] Figure 2 is an optical modulation transfer function diagram of the preferred embodiment of the full-frame unmanned aerial vehicle aerial camera lens of the present application;

[0031] Figure 3 is a distortion diagram of the preferred embodiment of the full-frame unmanned aerial vehicle aerial camera lens of the present application;

[0032] Figure 4 is an axial aberration diagram of the preferred embodiment of the full-frame unmanned aerial vehicle aerial camera lens of the present application;

[0033] Figure 5 is a lateral chromatic aberration diagram of the preferred embodiment of the full-frame unmanned aerial vehicle aerial camera lens of the present application.

[0034] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] It should be noted that if the directionality indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of the present application, the directionality indication is only used to explain the relative position relationship, motion condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indication also changes accordingly.

[0037] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0038] Please refer to Figures 1 to 5 The present application provides a full-frame unmanned aerial vehicle aerial lens, preferably, the full-frame unmanned aerial vehicle aerial lens of the embodiment is sequentially provided from the object side to the image side: a first lens G1 with negative refractive power, a second lens G2 with positive refractive power, a third lens G3 with negative refractive power, a fourth lens G4 with positive refractive power, a diaphragm shutter STO, a fifth lens G5 with positive refractive power, a sixth lens G6 with negative refractive power, a seventh lens G7 with negative refractive power and a protective glass CG.

[0039] The refractive index of the first lens G1 is 1.5 < Nd1 < 1.8, and the Abbe number is 30 < Vd1 < 50; the refractive index of the second lens G2 is 1.8 < Nd2 < 2.0, and the Abbe number is 20 < Vd2 < 35; the refractive index of the third lens G3 is 1.5 < Nd3 < 1.8, and the Abbe number is 30 < Vd3 < 50; the refractive index of the fourth lens G4 is 1.4 < Nd4 < 1.8, and the Abbe number is 80 < Vd4 < 95; the refractive index of the fifth lens G5 is 1.8 < Nd5 < 2.0, and the Abbe number is 30 < Vd5 < 50; the refractive index of the sixth lens G6 is 1.5 < Nd6 < 1.8, and the Abbe number is 25 < Vd6 < 40; the refractive index of the seventh lens G7 is 1.8 < Nd7 < 2.0, and the Abbe number is 30 < Vd7 < 50.

[0040] In this embodiment, the diaphragm shutter STO is arranged in the middle of the full-frame unmanned aerial vehicle aerial lens, which is symmetrical about the optical cable left and right, and is beneficial to correct the off-axis aberration of the lens.

[0041] In this embodiment, the first lens G1 is a crescent lens, which is used to collect the outer field of view light, reduce the light projection height, and reduce the aberration correction difficulty.

[0042] It should be noted that in the embodiment, except that the fourth lens G4 is a special dispersion glass, other lenses can use commonly used domestic glass, which is low in cost.

[0043] Further, in the embodiment, the third lens G3 and the fourth lens G4 constitute a first cemented lens JHG1, and the fifth lens G5 and the sixth lens G6 constitute a second cemented lens JHG2.

[0044] The first cemented lens JHG1 is composed of the image side surface of the third lens G3 and the object side surface of the fourth lens G4, the image side surface of the third lens G3 is a concave surface, and the object side surface of the fourth lens G4 is a convex surface.

[0045] The second cemented lens JHG2 is composed of the image side surface of the fifth lens G5 and the object side surface of the sixth lens G6, the image side surface of the fifth lens G5 is a concave surface, and the object side surface of the sixth lens G6 is a convex surface.

[0046] The embodiment is provided with the first cemented lens JH1 and the second cemented lens JH2 on both sides of the diaphragm shutter STO, which is conducive to correcting the on-axis aberration and coma of the lens, and has a good effect on the overall aberration correction of the lens.

[0047] The focal length, total length, field angle, aperture size, maximum lens and mirror size of the full-frame unmanned aerial vehicle aerial lens of the embodiment are shown in Table 1.

[0048] Table 1

[0049] focal length overall length angle of view aperture size maximum lens aperture image size 40mm 64.05mm 57° F5.6 28mm 43.6mm

[0050] Specifically, in the embodiment, the back focus of the full-frame unmanned aerial vehicle aerial lens is greater than 28mm, the effective aperture of the first lens G1 is greater than 28mm, and the effective apertures of other lenses are all less than 20mm. The focal length f of the full-frame unmanned aerial vehicle aerial lens is 40mm. The aperture F / # of the full-frame unmanned aerial vehicle aerial lens is F / 5.6. The total length TTL of the full-frame unmanned aerial vehicle aerial lens is less than 65mm.

[0051] The curvature radius, thickness, refractive index and Abbe number of each component in the embodiment are shown in Table 2.

[0052] Table 2

[0053]

[0054] In Table 2, the curvature radius and thickness are all in mm, the positive curvature radius means that the surface vertex is located on the left side of the lens main surface, the negative curvature radius means that the surface vertex is located on the right side of the lens main surface, and the infinite curvature radius means that the surface is a plane; the thickness represents the core thickness of the lens or the axial air gap between the lenses; and the refractive index and Abbe number represent the refractive index and Abbe number of the material used by the lens.

[0055] The full-frame unmanned aerial vehicle aerial lens of the present application has the following advantages:

[0056] 1. The maximum imaging height is 46mm, which can cover the full frame, the imaging picture is large, and the shooting range is wide.

[0057] 2. The achromatic design for 436-656nm is less than 5μm, and the shooting picture will not appear purple edge and color imbalance phenomenon.

[0058] 3. The distortion is less than 1%, and the shooting picture will not appear distortion phenomenon, and the restoration degree of the object is high.

[0059] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields within the concept of the present application, and the content of the present application are included in the patent protection scope of the present application.

Claims

1. A full-frame drone aerial photography lens, characterized in that, From the object side to the image side, there are successively provided: a first lens G1 with a negative focal power, a second lens G2 with a positive focal power, a third lens G3 with a negative focal power, a fourth lens G4 with a positive focal power, an aperture shutter STO, a fifth lens G5 with a positive focal power, a sixth lens G6 with a negative focal power, a seventh lens G7 with a negative focal power, and a protective glass CG; Among them, the refractive index of the first lens G1 is 1.5 < Nd1 < 1.8, and the Abbe number is 30 < Vd1 < 50; The refractive index of the second lens G2 is 1.8 < Nd2 < 2.0, and the Abbe number is 20 < Vd2 < 35; The refractive index of the third lens G3 is 1.5 < Nd3 < 1.8, and the Abbe number is 30 < Vd3 < 50; The refractive index of the fourth lens G4 is 1.4 < Nd4 < 1.8, and the Abbe number is 80 < Vd4 < 95; The refractive index of the fifth lens G5 is 1.8 < Nd5 < 2.0, and the Abbe number is 30 < Vd5 < 50; The refractive index of the sixth lens G6 is 1.5 < Nd6 < 1.8, and the Abbe number is 25 < Vd6 < 40; The refractive index of the seventh lens G7 is 1.8 < Nd7 < 2.0, and the Abbe number is 30 < Vd7 < 50; The third lens G3 and the fourth lens G4 form a first cemented lens JHG1, and the fifth lens G5 and the sixth lens G6 form a second cemented lens JHG2; The first cemented lens JHG1 is formed by cementing the image side surface of the third lens G3 and the object side surface of the fourth lens G4. The image side surface of the third lens G3 is concave, and the object side surface of the fourth lens G4 is convex; The second cemented lens JHG2 is formed by cementing the image side surface of the fifth lens G5 and the object side surface of the sixth lens G6. The image side surface of the fifth lens G5 is concave, and the object side surface of the sixth lens G6 is convex.

2. The full-frame drone aerial photography lens according to claim 1, characterized in that, The first lens G1 is a meniscus lens, which is used to collect light in the outer field of view, reduce the light projection height, and reduce the difficulty of aberration correction.

3. The full-frame drone aerial photography lens according to claim 1, characterized in that, The back focus of the full-frame UAV aerial photography lens is greater than 28 mm, and the effective aperture of the first lens G1 is greater than 28 mm.

4. The full-frame drone aerial photography lens according to claim 1, characterized in that, The focal length f of the full-frame UAV aerial photography lens is 40 mm.

5. The full-frame drone aerial photography lens according to claim 1, characterized in that, The aperture F / # of the full-frame UAV aerial photography lens is F / 5.

6.

6. The full-frame drone aerial photography lens according to claim 1, characterized in that, The total length TTL of the full-frame UAV aerial photography lens is less than 65 mm.

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