High-precision distortion correction large-target-surface live broadcast camera lens

Abstract

The invention discloses a high-precision distortion correction large-target surface live broadcast camera lens, which comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged from an object side to an image side along a main optical axis, the focal power of the first lens group, the third lens group and the fourth lens group is positive, and the focal power of the second lens group is negative. The first lens group and the fourth lens group are relatively and fixedly arranged, and the second lens group and the third lens group are respectively configured to be movably arranged along the main optical axis direction relative to the first lens group and the fourth lens group, so that zooming from a wide-angle end to a telephoto end is realized. The aspheric lenses are arranged at different positions of a light path, various aberrations such as spherical aberration, coma, astigmatism, image plane bending and chromatic dispersion are effectively corrected, the imaging quality is greatly improved, and the imaging effects of high resolution, large aperture, large wide angle, small distortion and large target surface are achieved; through internal focusing of the lens, the total length of the lens is kept unchanged, waterproof and dustproof effects are facilitated, and the use experience of the lens is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and specifically to a high-precision distortion correction large target surface live camera lens. Background Art

[0002] With the development and prevalence of Internet technology, video cameras have been widely used in fields such as video conferencing, webcasting, home, and security. Among them, the optical lens, as the "eye" of the camera, is required to have characteristics such as high resolution, large aperture, large wide angle, small distortion, and large target surface.

[0003] A zoom lens can change the focal length within a certain range, thereby obtaining different field angles of view with different widths, different sizes of images, and different ranges of scenes. Without changing the shooting distance, a zoom lens can change the shooting range by pushing or rotating the zoom ring of the lens, so it is very beneficial for picture composition. Since a zoom lens can perform the functions of several fixed-focus lenses, when in use, it not only reduces the number of photographic equipment carried, but also saves the time for changing lenses.

[0004] Currently, the lenses applied in the market for video live broadcast have deficiencies such as non-variable focal length, small target surface, small aperture, and obvious edge distortion and chromatic aberration. Moreover, the existing zoom lenses are telescopic zoom, and the total axial length of the lens will change during zooming, affecting the user experience. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a high-precision distortion correction large target surface live camera lens.

[0006] The high-precision distortion correction large target surface live camera lens according to the first aspect of the embodiments of the present invention is characterized in that the high-precision distortion correction large target surface live camera lens has a principal optical axis, and the high-precision distortion correction large target surface live camera lens includes: a first lens group, a second lens group, a third lens group, and a fourth lens group arranged in sequence from the object side to the image side along the principal optical axis; The optical powers of the first lens group, the third lens group, and the fourth lens group are all positive; the optical power of the second lens group is negative; The first lens group and the fourth lens group are relatively fixedly arranged, and the second lens group and the third lens group are respectively configured to move along the principal optical axis direction relative to the first lens group and the fourth lens group; The first lens group includes a first lens; The second lens group includes a second lens with negative optical power, a third lens with negative optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power, which are arranged in sequence from the object side to the image side. One of the second lens, the third lens, and the fourth lens is set as an aspherical lens; The third lens group includes at least a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens, which are arranged in sequence from the object side to the image side; The sixth lens, the seventh lens, the eighth lens, and the tenth lens are all positive lenses, the ninth lens and the eleventh lens are both negative lenses, the ninth lens and the tenth lens are glued to each other, one of the sixth lens, the seventh lens, and the eighth lens is an aspherical lens, and the lens on the side close to the fourth lens group in the third lens group is an aspherical lens; The fourth lens group includes at least one thirteenth lens, and the lens on the side close to the image side in the fourth lens group is an aspherical lens.

[0007] The high-precision distortion correction large target surface live camera lens according to the embodiment of the present invention has at least the following beneficial effects: 1. By configuring aspherical lenses at different positions in the optical path, the present invention effectively corrects various aberrations such as spherical aberration, coma, astigmatism, field curvature, and chromatic aberration, so that various aberrations are well corrected, and the imaging quality is greatly improved, achieving imaging effects of high resolution, large aperture, large wide angle, small distortion, and large target surface.

[0008] 2. By keeping the first lens group and the fourth lens group relatively fixed, and moving the second lens group and the third lens group to achieve focal length change, in-lens focusing is realized, and the total length of the lens remains unchanged, which is beneficial to waterproof and dustproof, and optimizes the use experience of the lens.

[0009] According to some embodiments of the present invention, the optical system further includes a diaphragm, and the diaphragm is arranged between the second lens group and the third lens group.

[0010] According to some embodiments of the present invention, the diaphragm is movably arranged along the principal optical axis and moves simultaneously with the third lens group.

[0011] According to some embodiments of the present invention, the position of the diaphragm satisfies the following conditional formula: 0.40≦ST_L / TTLw≦0.65; wherein, ST_L is the distance from the lens closest to the object side in the first lens group to the diaphragm, and TTLw is the overall optical length when the entire system is focused at infinity at the wide-angle end.

[0012] According to some embodiments of the present invention, the first lens group satisfies the following conditional formula: 12≦f1 / fw≦45; Among them, f1 is the focal length of the first lens group, and fw is the focal length when the entire system is focused at infinity at the wide-angle end.

[0013] According to some embodiments of the present invention, the second lens group satisfies the following conditional formula: 16.4 ≦ Vd2 ≦ 30; Among them, Vd2 is the average value of the Abbe numbers of all positive lenses in the second lens group.

[0014] According to some embodiments of the present invention, the second lens group satisfies the following conditional formula: -2.8 ≦ f2 / fw ≦ -1.2; Among them, f2 is the focal length of the second lens group, and fw is the focal length when the entire system is focused at infinity at the wide-angle end.

[0015] According to some embodiments of the present invention, the third lens group satisfies the following conditional formula: Nd3 ≦ 1.65; 65 ≦ Vd3 ≦ 81.8; Among them, Nd3 is the average value of the refractive indices of the d-lines of all positive lenses in the third lens group, and Vd3 is the average value of the Abbe numbers of the d-lines of all positive lenses in the third lens group.

[0016] According to some embodiments of the present invention, the third lens group satisfies the following conditional formula: 2.1 ≦ f3 / fw ≦ 5.0; Among them, f3 is the focal length of the third lens group, and fw is the focal length when the entire system is focused at infinity at the wide-angle end.

[0017] According to some embodiments of the present invention, the aspherical lens of the high-precision distortion correction large target surface live camera lens is made of resin.

[0018] Other features and advantages of the present invention will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings and embodiments, where: Figure 1 is a schematic structural diagram of an embodiment of the high-precision distortion correction large target surface live camera lens of the present invention at the wide-angle end; Figure 2 is a schematic structural diagram of an embodiment of the high-precision distortion correction large target surface live camera lens of the present invention at the telephoto end; Figure 3 is Figure 1 aberration diagrams of spherical aberration, astigmatism, and distortion at the wide-angle end of the embodiment; Figure 4 For Figure 1 Aberration diagrams of spherical aberration, astigmatism, and distortion at the intermediate end of the embodiment; Figure 5 For Figure 1 Aberration diagrams of spherical aberration, astigmatism, and distortion at the telescopic end of the embodiment; Reference numerals in the drawings: First lens group 100; first lens 101; Second lens group 200; second lens 201; third lens 202; fourth lens 203; fifth lens 204; Third lens group 300; sixth lens 301; seventh lens 302; eighth lens 303; ninth lens 304; tenth lens 305; eleventh lens 306; twelfth lens 307; Fourth lens group 400; thirteenth lens 401; fourteenth lens 402; Diaphragm 500. Detailed implementation manners

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] In the description of the present invention, "a plurality of" refers to more than two. If the first and second are described, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0024] The technical solutions of the present invention will be described clearly and completely below with reference to the drawings. Obviously, the following described embodiments are some, but not all, of the embodiments of the present invention.

[0025] With the development and prevalence of Internet technology, video cameras have been widely used in fields such as video conferencing, webcasting, home use, and security. Among them, the optical lens, as the "eye" of the camera, is required to have characteristics such as high resolution, large aperture, wide angle, low distortion, and large image circle.

[0026] A zoom lens can change its focal length within a certain range, thereby obtaining different field angles of view with different widths, different sizes of images, and different ranges of scenes. Without changing the shooting distance, a zoom lens can change the shooting range by pushing or rotating the zoom ring of the lens, so it is very beneficial for picture composition. Since a zoom lens can perform the functions of several fixed-focus lenses, when in use, it not only reduces the number of photographic equipment carried but also saves the time for changing lenses.

[0027] Currently, the lenses applied in video live broadcasts in the market have deficiencies such as non-variable focal length, small image circle, small aperture, and obvious edge distortion and chromatic aberration. Moreover, the existing zoom lenses are telescopic zoom lenses, and the total axial length of the lens will change during zooming, affecting the user experience.

[0028] To solve the above problems, the present invention provides a high-precision distortion correction large-image-circle live camera lens.

[0029] Refer to Figures 1 to 4 As shown, the high-precision distortion correction large-image-circle live camera lens provided by the present invention has a principal optical axis. The lens sequentially includes a first lens group 100, a second lens group 200, a third lens group 300, and a fourth lens group 400 from the object side to the image side. The optical powers of the first lens group 100, the third lens group 300, and the fourth lens group 400 are positive, and the optical power of the second lens group 200 is negative. Among them, the first lens group 100 and the fourth lens group 400 are relatively fixed, with their relative positions unchanged. The second lens group 200, the aperture stop 500, and the third lens group 300 are movably arranged along the principal optical axis. The zooming of the optical system from the wide-angle end to the telephoto end is achieved by the movement of the second lens group 200 and the third lens group 300, thereby realizing in-lens focusing.

[0030] During the focusing process of the in-lens focusing structure, the overall length of the optical system remains unchanged. Compared with telescopic focusing, it has higher precision and flexibility. Since the moving distance of the lens group is short, it can achieve rapid focusing. At the same time, since the position of the lens barrel does not need to move, the sealing performance is good, which is beneficial for the lens to be waterproof and dustproof, thereby protecting the lens and improving the user experience.

[0031] Among them, the first lens group 100 includes a first lens 101; The second lens group 200 includes a second lens 201 with negative optical power, a third lens 202 with negative optical power, a fourth lens 203 with negative optical power, and a fifth lens 204 with positive optical power, which are arranged in sequence from the object side to the image side. One of the second lens 201, the third lens 202, and the fourth lens 203 is set as an aspherical lens; The third lens group 300 of this embodiment includes at least a sixth lens 301, a seventh lens 302, an eighth lens 303, a ninth lens 304 and a tenth lens 305 that are glued together, and an eleventh lens 306, which are arranged in sequence from the object side to the image side. Among them, the sixth lens 301, the seventh lens 302, the eighth lens 303, and the tenth lens 305 are all positive lenses, the ninth lens 304 and the eleventh lens 306 are both negative lenses. One of the sixth lens 301, the seventh lens 302, and the eighth lens 303 is an aspherical lens, and the lens in the third lens group 300 close to the fourth lens group 400 is an aspherical lens; The fourth lens group 400 includes at least one thirteenth lens 401, and the lens in the fourth lens group close to the image side is an aspherical lens.

[0032] The present invention stipulates the optical power of the whole system lenses and the configuration of the aspherical lenses. By configuring aspherical lenses of different materials at different positions, various aberrations such as spherical aberration, coma, astigmatism, field curvature, and chromatic aberration can be effectively corrected, so as to achieve good correction of various aberrations, achieve good imaging quality, meet the imaging requirements of high pixels and large apertures, and be applicable to various fields such as video live broadcast.

[0033] Specifically, the first lens group 100 is a single-element lens group, which can be a single lens or a glued lens. In this embodiment, the first lens group 100 includes a first lens 101, and the first lens 101 is a meniscus lens with positive optical power. In some other embodiments, the first lens 101 can have other structures, such as a doublet lens, etc.

[0034] The first lens group 100 satisfies the following conditional formula: 12≦f1 / fw≦45; Wherein, f1 is the focal length of the first lens group 100, and fw is the focal length when the whole system focuses at infinity at the wide-angle end.

[0035] The above conditional formula stipulates the ratio of the focal distance of the first lens group 100 to the focal distance at the wide-angle end, so as to ensure that chromatic aberration and distortion are not too large while meeting the miniaturization of the lens. When exceeding the upper limit specification of the conditional formula, the optical power of the first lens group 100 becomes weaker, resulting in a smaller varifocal effect of the second lens group 200, which is not conducive to the miniaturization of the lens; when exceeding the lower limit specification of the conditional formula, the optical power of the first lens group 100 becomes stronger, and the lateral chromatic aberration generated at the wide-angle end will become larger, and at the same time, the change in field curvature during the zooming process will be larger, which is not conducive to the realization of high performance. The second lens group 200 of this embodiment sequentially includes, from the object side to the image side: a second lens 201, a third lens 202, a fourth lens 203, and a fifth lens 204. Among them, the second lens 201 and the third lens 202 are meniscus lenses with a negative optical power and a concave image side, the third lens 202 is an aspherical lens, the fourth lens 203 is a biconcave lens with a negative optical power, and the fifth lens 204 is a meniscus lens with a positive optical power.

[0036] Among them, in some embodiments, the second lens group 200 satisfies the following conditional formula: -2.8 ≦ f2 / fw ≦ -1.2; Among them, f2 is the focal length of the second lens group 200, and fw is the focal length when the entire system is focused at infinity at the wide-angle end.

[0037] The above conditional formula stipulates the ratio of the focal distance of the second lens group 200 to the focal distance at the wide-angle end, so as to make the lens structure compact while meeting the requirements of lens aberration correction. When exceeding the upper limit specification of the above formula, the optical power of the second lens group 200 becomes weaker, and the moving distance of this lens group will also increase, which is not conducive to the miniaturization of the lens, and is also not conducive to the aberration correction of the entire lens; when exceeding the lower limit specification, the optical power of the second lens group 200 becomes stronger. Although it is beneficial to the miniaturization of the lens, the optical power of the second lens group 200 is too strong, and it is difficult to correct off-axis aberrations.

[0038] In some embodiments, the second lens group 200 also satisfies the following conditional formula: 16.4 ≦ Vd2 ≦ 30; Among them, Vd2 is the average value of the Abbe numbers of all positive lenses in the second lens group 200. The above conditional formula stipulates the Abbe number of the positive lenses in the second lens group 200. When the conditional formula is satisfied, the lateral chromatic aberration generated at the wide-angle end can be well corrected, and good performance can be obtained; when exceeding the upper limit specification of the conditional formula, the Abbe number of the positive lenses in the second lens group 200 is too large, resulting in insufficient correction of lateral chromatic aberration; when exceeding the lower limit specification of the conditional formula, the Abbe number of the positive lenses is too small, causing overcorrection of lateral chromatic aberration.

[0039] The third lens group 300 includes a sixth lens 301, a seventh lens 302, an eighth lens 303, a ninth lens 304 and a tenth lens 305 that are glued together, an eleventh lens 306, and a twelfth lens 307 that are sequentially arranged from the object side to the image side. Among them, the sixth lens 301 is a meniscus lens with a concave image side, the seventh lens 302, the eighth lens 303, and the tenth lens 305 are all biconvex positive lenses, the ninth lens 304 is a biconcave negative lens, the eleventh lens 306 is a meniscus negative lens. In addition, the sixth lens 301, the eleventh lens 306, and the twelfth lens 307 are all aspherical lenses.

[0040] Further, in some embodiments, the third lens group 300 satisfies the following conditional expressions: Nd3 ≦ 1.65; 65 ≦ Vd3 ≦ 81.8; wherein, Nd3 is the average refractive index of the d-line of all positive lenses of the third lens group 300, and Vd3 is the average Abbe number of the d-line of all positive lenses of the third lens group 300.

[0041] The fourth lens group 400 includes at least one thirteenth lens 401. In this embodiment, the fourth lens group 400 further includes a fourteenth lens 402, and the fourteenth lens 402 is an aspherical lens.

[0042] In some embodiments, the optical system further includes a diaphragm 500. The diaphragm 500 is disposed between the second lens group 200 and the third lens group 300 and is movably disposed along the principal optical axis. When zooming, the diaphragm 500 moves simultaneously with the third lens group 300. A lens fixed relative to the diaphragm 500 is easier to miniaturize. At the same time, the movable diaphragm 500 can achieve a larger zoom ratio, so as to adapt to more usage scenarios and meet various usage requirements.

[0043] Further, the position of the diaphragm 500 satisfies the following conditional expressions: 0.40 ≦ ST_L / TTLw ≦ 0.65; wherein, ST_L is the distance from the lens closest to the object side of the first lens group 100 to the diaphragm 500, and TTLw is the overall optical length at infinity focus in the wide-angle end.

[0044] The above conditional expressions limit the incident pupil position and the exit pupil position by specifying the ratio between the position of the aperture diaphragm relative to the lens on the object side and the overall length of the lens. When the conditional expression exceeds the upper limit, the incident pupil position is too far, resulting in an increase in the outer diameter of the first lens group 100 in the wide-angle end, which is not conducive to lens miniaturization; on the contrary, when the conditional expression exceeds the lower limit, the exit pupil position is close to the object side, resulting in an increase in the outer diameter of the third lens group 300, which is also not conducive to miniaturization.

[0045] Refer to Figure 1 , in the high-precision distortion correction large-format live camera lens according to an embodiment of the present invention, from the object side to the image side, it sequentially includes: a first lens 101, a second lens 201, a third lens 202, a fourth lens 203, a fifth lens 204, a diaphragm 500, a sixth lens 301, a seventh lens 302, an eighth lens 303, a ninth lens 304, a tenth lens 305, an eleventh lens 306, a twelfth lens 307, a thirteenth lens 401, and a fourteenth lens 402.

[0046] The curvature radius R (mm), interval D (mm), refractive index Nd, and Abbe number ABV of each surface from the object side to the image side of the high-precision distortion correction large-format live camera lens in this embodiment are shown in Table 1; Table 1

[0047] Among them, the third lens 202, the sixth lens 301, the eleventh lens 306, the twelfth lens 307, and the fourteenth lens 402 are aspherical lenses, which meet the requirements that there is one aspherical lens among the negative lenses of the second lens group 200, there is one aspherical lens among the negative lenses of the third lens group 300, the lens closest to the fourth lens group 400 in the third lens group 300 is an aspherical lens, and the fourth lens group 400 includes one aspherical lens.

[0048] Calculated based on the values of the above surfaces: Nd3 = 1.53, meeting the conditional formula Nd3 ≤ 1.65; Vd3 = 76.4, meeting the conditional formula 65 ≤ Vd3 ≤ 81.8; f3 / fw = 2.74, meeting the conditional formula 2.1 ≤ f3 / fw ≤ 5.0; f2 / fw = -1.91, meeting the conditional formula -2.8 ≤ f2 / fw ≤ -1.2; Vd2 = 25.46, meeting the conditional formula 16.4 ≤ Vd2 ≤ 30; f1 / fw = 20.98, meeting the conditional formula 12 ≤ f1 / fw ≤ 45; ST_L / TTLw = 0.58, meeting the conditional formula 0.40 ≤ ST_L / TTLw ≤ 0.65.

[0049] The focal length f, aperture value Fno, half field of view ω, interval D(0) of the 0th surface, interval D(2) of the 2nd surface, interval D(10) of the 10th surface, and interval D(24) of the 24th surface of the high-precision distortion correction large-format live camera lens in this embodiment adjusted to the wide-angle end, middle, and telephoto end are shown in Table 2; Table 2

[0050] As can be seen from Table 2, the aperture value of the wide-angle end of the optical system designed in this embodiment reaches F1.2. Since the smaller the aperture value, the larger the aperture, the aperture of this embodiment is larger than that of the existing mainstream wide-angle video live lenses with F1.6 and F1.8, and more light can enter within the same unit time; the half field of view angle of the wide-angle end of this embodiment reaches 46.5°, enabling large-format zoom, and the format can reach one inch.

[0051] In addition, the third lens 202, the sixth lens 301, the eleventh lens 306, the twelfth lens 307, and the fourteenth lens 402 of the high-precision distortion correction large-format live camera lens of this embodiment are aspherical lenses. According to the data in Table 1 and the aspherical formula, the sag value of each aspherical surface, that is, the depression X of the lens surface, is obtained. The light incident surface and light exit surface parameters of the aspherical lenses of this embodiment are shown in Table 3.

[0052] Table 3

[0053] Among them, the aspherical formula is as follows:

[0054] Among them, In Table 3, "*4" is the value of the AH4 term, "*6" is the value of the BH6 term, "*8" is the value of the CH8 term, "*10" is the value of the DH10 term, and "*12" is the value of the EH12 term.

[0055] Regarding the imaging quality of the high-precision distortion correction large-format live camera lens of this embodiment: Refer to Figures 2 to 4 As shown, when the high-precision distortion correction large-format live camera lens is adjusted to the wide-angle end, a straight line represents light with a wavelength of 656.2800 nm, a dotted line represents light with a wavelength of 587.5600 nm, and a dash-dotted line represents light with a wavelength of 435.8400 nm; from left to right in each figure, they represent the spherical aberration corresponding to light of three wavelengths at different focal lengths, the astigmatism corresponding to light with a wavelength of 587.5600 nm, and the distortion corresponding to light with a wavelength of 587.5600 nm. From Figures 2 to 4 it can be seen that the spherical aberration of this high-precision distortion correction large-format live camera lens from the wide-angle end to the telephoto end is maintained within 0.20 mm, the chromatic aberration is maintained within 0.1 mm, the astigmatism is maintained within 0.5 mm, and the distortion is maintained within 15%. It can be seen that through the setting of multiple aspherical lenses and the design and arrangement of the lenses in this embodiment, effective correction of spherical aberration, chromatic aberration, astigmatism, distortion, etc. is achieved, improving the imaging quality and usage effect.

[0056] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art to which it pertains.

Claims

1. High-precision distortion correction large-surface live camera lens, characterized by: The high-precision distortion-corrected large-target live camera lens has a main optical axis, and the high-precision distortion-corrected large-target live camera lens comprises: a first lens group, a second lens group, a third lens group and a fourth lens group arranged in sequence from the object side to the image side along the main optical axis; The optical power of the first lens group, the third lens group and the fourth lens group are all positive; the optical power of the second lens group is negative; The first lens group and the fourth lens group are relatively fixed, and the second lens group and the third lens group are respectively configured to be movable relative to the first lens group and the fourth lens group along the main optical axis direction; The first lens group includes a first lens; The second lens group includes a second lens with negative optical power, a third lens with negative optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power, which are arranged in sequence from the object side to the image side, and one of the second lens, the third lens, and the fourth lens is set to be an aspherical lens; The third lens group at least includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side; The sixth lens, the seventh lens, the eighth lens and the tenth lens are all positive lenses, the ninth lens and the eleventh lens are all negative lenses, the ninth lens and the tenth lens are glued to each other, one of the sixth lens, the seventh lens and the eighth lens is an aspherical lens, and the lens on the side of the third lens group close to the fourth lens group is an aspherical lens; The fourth lens group includes at least one thirteenth lens, and the lens close to the image side in the fourth lens group is an aspherical lens.

2. The high-precision distortion-corrected large-target live camera lens according to claim 1, characterized in that: The optical system further comprises an aperture stop, and the aperture stop is arranged between the second lens group and the third lens group.

3. The high-precision distortion-corrected large-target live camera lens according to claim 2, characterized in that: The aperture is arranged to move along the main optical axis direction and moves simultaneously with the third lens group.

4. The high-precision distortion-corrected large-target live camera lens according to claim 3, characterized in that: The aperture position satisfies the following condition: 0.40≦ST_L / TTLw≦0.65; Among them, ST_L is the distance from the lens closest to the object side of the first lens group to the aperture, and TTLw is the total optical length when the entire system is focused at infinity at the wide-angle end.

5. The high-precision distortion-corrected large-surface live camera lens according to claim 1, characterized in that: The first lens group satisfies the following condition: 12≦f1 / fw≦45; Among them, f1 is the focal length of the first lens group, and fw is the focal length when the whole system is focused at infinity at the wide-angle end.

6. The high-precision distortion-corrected large-target live camera lens according to claim 1, characterized in that: The second lens group satisfies the following condition: 16.4≦Vd2≦30; Wherein, Vd2 is the average value of the Abbe numbers of all positive lenses in the second lens group.

7. The high-precision distortion-corrected large-surface live camera lens according to claim 1, characterized in that: The second lens group satisfies the following condition: -2.8≦f2 / fw≦-1.2; Among them, f2 is the focal length of the second lens group, and fw is the focal length when the whole system is focused at infinity at the wide-angle end.

8. The high-precision distortion-corrected large-surface live camera lens according to claim 1, characterized in that: The third lens group satisfies the following conditional formula: Nd3≦1.65; 65≦Vd3≦81.8; Wherein, Nd3 is the average refractive index of the d-line of all the positive lenses of the third lens group, and Vd3 is the average Abbe number of the d-line of all the positive lenses of the third lens group.

9. The high-precision distortion-corrected large-surface live camera lens according to claim 1, characterized in that: The third lens group satisfies the following conditional formula: 2.1≦f3 / fw≦5.0; Among them, f3 is the focal length of the third lens group, and fw is the focal length when the entire system is focused at infinity at the wide-angle end.

10. The high-precision distortion-corrected large-surface live camera lens according to claim 1, characterized in that: The aspherical lens of the high-precision distortion-corrected large-target live camera lens is made of resin.

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