Zoom optical system and imaging device

Abstract

The present invention discloses a zoom optical system and a imaging device. The zoom optical system includes a lens barrel and a lens group. The lens group includes a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, a fifth lens group with a positive optical power, and a sixth lens group with a negative optical power, which are arranged in sequence from the object side to the image side. Through the reasonable setting of the six lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom optical system to the focal lengths of each lens group, the F-number of the zoom optical system can reach 1.1. At such an aperture number, there can be more light entering amount in low-light environments. The combination of multiple aspherical lenses and multiple ZOOM group structures ensures the imaging quality to improve the imaging quality in low light and at long focal lengths.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system design, and particularly to a zoom optical system and a camera device applied to a monitoring system. Background Art

[0002] At present, the mainstream high-image-quality zoom lenses of monitoring systems on the market have a relatively small aperture, resulting in unsatisfactory performance in low-light environments or a sharp decline in performance at long focal lengths, unable to meet market demands. Summary of the Invention

[0003] The main object of the present invention is to provide a zoom optical system and a camera device, aiming to improve the imaging quality in low light and at long focal lengths.

[0004] To achieve the above object, the present invention provides a zoom optical system. The zoom optical system has an object side and an image side oppositely arranged along the optical axis direction. The zoom optical system includes:

[0005] A lens barrel; and,

[0006] A plurality of lens groups disposed in the lens barrel, including a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, a fifth lens group with a positive optical power, a sixth lens group with a negative optical power, and an image sensor chip arranged in sequence from the object side to the image side. Among them, the second lens group and the fourth lens group are movably arranged along the extension direction of the optical axis to zoom the zoom optical system, and the fifth lens group moves cooperatively along the optical axis direction to focus the zoom optical system;

[0007] Wherein, the focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, and the focal length of the sixth lens group is f6. The zoom optical system satisfies the following conditions:

[0008] 0.152 < fw / f1 < 0.205, and -1.157 < fw / f2 < -0.855, and 0.425 < fw / f3 < 0.575, and -0.439 < fw / f4 < -0.325, and 0.529 < fw / f5 < 0.715, and -0.289 < fw / f6 < -0.214.

[0009] Optionally, the first lens group includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with a positive optical power arranged in sequence from the object side to the image side;

[0010] The first lens, the second lens, the third lens, and the fourth lens are all glass spherical lenses;

[0011] The first lens and the second lens are adhesively connected;

[0012] The focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, and the focal length of the fourth lens is f14. The lenses within the first lens group satisfy the following conditions:

[0013] 0.097 < f1 / f11 < 0.132, and -0.709 < f1 / f12 < -0.524, and 0.415 < f1 / f13 < 0.561, and 0.324 < f1 / f14 < 0.438.

[0014] Optionally, the second lens group includes a fifth lens with a negative optical power, a sixth lens with a negative optical power, and a seventh lens with a positive optical power, which are arranged in sequence from the object side to the image side;

[0015] The fifth lens is a glass aspherical lens, and the sixth lens and the seventh lens are glass spherical lenses;

[0016] The sixth lens and the seventh lens are adhesively connected;

[0017] The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23. The lenses within the second lens group satisfy the following conditions:

[0018] 0.606 < f2 / f21 < 0.819, and 0.13 < f2 / f22 < 0.176, and -0.107 < f2 / f23 < -0.079.

[0019] Optionally, the third lens group includes an eighth lens with a positive optical power and a ninth lens with a positive optical power, which are arranged in sequence from the object side to the image side;

[0020] The eighth lens is a glass aspherical lens, and the ninth lens is a glass spherical lens;

[0021] The focal length of the eighth lens is f31, and the focal length of the ninth lens is f32. The lenses within the third lens group satisfy the following conditions:

[0022] 0.442 < f3 / f31 < 0.599, and 0.457 < f3 / f32 < 0.618.

[0023] Optionally, the fourth lens group includes a tenth lens with a negative optical power, and the tenth lens is a glass aspherical lens; and / or,

[0024] The sixth lens group includes a fourteenth lens with a negative optical power, and the fourteenth lens is a glass aspherical lens.

[0025] Optionally, the fifth lens group includes an eleventh lens with a positive optical power, a twelfth lens with a negative optical power, and a thirteenth lens with a positive optical power, which are arranged in sequence from the object side to the image side;

[0026] The eleventh lens and the twelfth lens are glass spherical lenses, and the thirteenth lens is a glass aspherical lens;

[0027] The eleventh lens and the twelfth lens are adhesively connected;

[0028] The focal length of the eleventh lens is f51, the focal length of the twelfth lens is f52, and the focal length of the thirteenth lens is f53. The lenses in the fifth lens group satisfy the following conditions:

[0029] 0.339 < f5 / f51 < 0.459, and -0.429 < f5 / f52 < -0.317, and 0.902 < f5 / f53 < 1.22.

[0030] Optionally, the zoom optical system satisfies the following conditions:

[0031] Wherein, is the effective clear aperture of the first lens, and TTL is the overall optical length of the zoom optical system.

[0032] Optionally, the zoom optical system satisfies the following conditions: 0.233 < ΔZ1 W-T / TTL < 0.273, 0.066 < ΔZ2 W-T / TTL < 0.08;

[0033] Wherein, ΔZ1 W-T is the relative displacement of the second lens group when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, and ΔZ2 W-T is the relative displacement of the fourth lens group when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, and TTL is the overall optical length of the zoom optical system.

[0034] Optionally, the zoom optical system further includes a diaphragm, and the diaphragm is located between the second lens group and the third lens group;

[0035] Wherein, the distance from the diaphragm to the image plane of the zoom optical system on the optical axis is L, the total optical length of the zoom optical system is TTL, and within the zoom optical system: 0.401 < L / TTL < 0.49.

[0036] An imaging device, the imaging device includes a zoom optical system, the zoom optical system has an object side and an image side oppositely arranged along the optical axis direction, and the zoom optical system includes:

[0037] A lens barrel; and,

[0038] A plurality of lens groups, arranged in the lens barrel, including a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, a fifth lens group with a positive optical power, a sixth lens group with a negative optical power, and an image sensor chip arranged in sequence from the object side to the image side. Wherein, the second lens group and the fourth lens group are movably arranged along the extension direction of the optical axis to zoom the zoom optical system, and the fifth lens group moves cooperatively along the optical axis direction to focus the zoom optical system;

[0039] Wherein, the focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, the focal length of the sixth lens group is f6, and the zoom optical system satisfies the following conditions:

[0040] 0.152 < fw / f1 < 0.205, and -1.157 < fw / f2 < -0.855, and 0.425 < fw / f3 < 0.575, and -0.439 < fw / f4 < -0.325, and 0.529 < fw / f5 < 0.715, and -0.289 < fw / f6 < -0.214.

[0041] In the technical solution provided by the present invention, the second lens group and the fourth lens group are movably mounted on the lens barrel along the optical axis for zooming, and the fourth lens group moves cooperatively along the optical axis so that the zoom optical system zooms from the wide-angle end to the telephoto end. Moreover, the fifth lens group is driven by an external force to move along the optical axis for focusing corresponding to the positions of the second lens group and the fourth lens group, the imaging wavelength, and the imaging object distance, so that the image plane of the zoom optical system remains in clear imaging during the zooming process. The first lens group has a positive optical power, the second lens group has a negative optical power, the third lens group has a positive optical power, the fourth lens group has a negative optical power, the fifth lens group has a positive optical power, and the sixth lens group has a negative optical power. Through the reasonable setting of the six lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom optical system to the focal lengths of each lens group, the F-number of the zoom optical system can reach 1.1. At such an aperture number, more light can enter in a low-light environment. The combination of multiple aspherical lenses and multiple ZOOM group structures ensures the imaging quality, so as to improve the imaging quality in low light and at long focal lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0043] Figure 1 FIG. 9 is a schematic structural diagram of the first embodiment of the zoom optical system provided by the present invention at the wide-angle end;

[0044] Figure 2 FIG. 13 is a schematic structural diagram of the zoom optical system at an intermediate magnification;

[0045] Figure 3 FIG. 17 is a schematic structural diagram of the zoom optical system at the telephoto end;

[0046] Figure 4 FIG. Figure 1 23 is an aberration diagram of the zoom optical system at the wide-angle end in FIG.

[0047] Figure 5 FIG. Figure 1 29 is a field curvature / distortion diagram of the zoom optical system at the wide-angle end in FIG.

[0048] Figure 6 FIG. Figure 2 35 is a spherical aberration diagram of the zoom optical system at an intermediate magnification in FIG.

[0049] Figure 7 is Figure 2 the field curvature / distortion diagram of the zoom optical system in the middle magnification in

[0050] Figure 8 is Figure 3 the aberration diagram of the zoom optical system at the telephoto end in

[0051] Figure 9 is Figure 3 the field curvature / distortion diagram of the zoom optical system at the telephoto end in

[0052] Explanation of the reference numerals in the drawings:

[0053] Label Name Label Name 1 The first lens group 32 The ninth lens 11 The first lens 4 The fourth lens group 12 The second lens 41 The tenth lens 13 The third lens 5 The fifth lens group 14 The fourth lens 51 The eleventh lens 2 The second lens group 52 The twelfth lens 21 The fifth lens 53 The thirteenth lens 22 The sixth lens 6 The sixth lens group 23 The seventh lens 61 The fourteenth lens 3 The third lens group 7 The photosensitive chip 31 The eighth lens 8 The diaphragm

[0054] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that if there are directional indications in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0057] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. Moreover, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0058] At present, the zoom lenses of mainstream high-image-quality monitoring systems on the market have a relatively small aperture, resulting in unsatisfactory performance in low-light environments or a significant decline in performance at long focal lengths, unable to meet market demands.

[0059] The present invention provides a zoom optical system, aiming to improve the technical problem that wide angle and small distortion cannot coexist in the prior art. Please refer to Figures 1 to 9 , and the accompanying drawings show specific embodiments of the zoom optical system.

[0060] Figures 1 to 9 This is an embodiment of the zoom optical system provided by the present invention.

[0061] Please refer to Figures 1 to 3 , the zoom optical system has an object side and an image side arranged oppositely along the optical axis direction. The zoom optical system includes a lens barrel (not shown in the figure) and a plurality of lens groups. The lens barrel extends along the optical axis direction, and the lens groups are arranged in the lens barrel. The lens groups include a first lens group 1 with positive optical power, a second lens group 2 with negative optical power, a third lens group 3 with positive optical power, a fourth lens group 4 with negative optical power, a fifth lens group 5 with positive optical power, a sixth lens group 6 with negative optical power, and an image sensor 7, where the second lens group 2 and the fourth lens group 4 are movably arranged along the extension direction of the optical axis to zoom the zoom optical system, and the fifth lens group 5 moves cooperatively along the optical axis direction to focus the zoom optical system.

[0062] It should be noted that when the second lens group 2 and the fourth lens group 4 move along the extension direction of the optical axis, they are used for zooming. The fourth lens group 4 moves cooperatively along the optical axis direction to zoom the zoom optical system from the wide-angle end to the telephoto end. The fifth lens group 5 is driven by an external force to move along the optical axis corresponding to the positions of the second lens group 2 and the fourth lens group 4, the imaging wavelength, and the imaging object distance for focusing, so that the zoom optical system maintains clear imaging on the image plane during the zooming process.

[0063] It should also be noted that both the second lens group 2 and the fourth lens group 4 can be driven by an external force to move along the optical axis direction. Among them, the external force drive can be a drive motor drive or manual adjustment by hand, and no limitation is made here.

[0064] Moreover, the focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, the focal length of the fourth lens group 4 is f4, the focal length of the fifth lens group 5 is f5, and the focal length of the sixth lens group 6 is f6. The zoom optical system satisfies the following conditions: 0.152 < fw / f1 < 0.205, -1.157 < fw / f2 < -0.855, 0.425 < fw / f3 < 0.575, -0.439 < fw / f4 < -0.325, 0.529 < fw / f5 < 0.715, and -0.289 < fw / f6 < -0.214.

[0065] In the technical solution provided by the present invention, the second lens group 2 and the fourth lens group 4 are movably mounted on the lens barrel along the optical axis for zooming, and the fourth lens group 4 moves cooperatively along the optical axis so that the zoom optical system zooms from the wide-angle end to the telephoto end. Moreover, the fifth lens group 5 is driven by an external force to move along the optical axis for focusing corresponding to the positions of the second lens group 2 and the fourth lens group 4, the imaging wavelength, and the imaging object distance, so that the image plane of the zoom optical system remains in clear imaging during the zooming process. The first lens group 1 has a positive optical power, the second lens group 2 has a negative optical power, the third lens group 3 has a positive optical power, the fourth lens group 4 has a negative optical power, the fifth lens group 5 has a positive optical power, and the sixth lens group 6 has a negative optical power. Through the reasonable arrangement of the six lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom optical system to the focal lengths of each lens group, the F-number of the zoom optical system can reach 1.1. At such an F-number, more light can enter in a low-light environment. The combination of multiple aspherical lenses and multiple ZOOM group structures ensures the imaging quality and improves the imaging quality in low light and at long focal lengths.

[0066] In a specific embodiment, the ratios of the focal length of the zoom optical system at the wide-angle end to the focal lengths of each lens group are as follows: fw / f1 = 0.17; fw / f2 = -0.98; fw / f3 = 0.49; fw / f4 = -0.37; fw / f5 = -0.61; fw / f6 = -0.25.

[0067] Specifically, the first lens group 1 includes a first lens 11 with a positive optical power, a second lens 12 with a negative optical power, a third lens 13 with a positive optical power, and a fourth lens 14 with a positive optical power, which are arranged in sequence from the object side to the image side; the focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, the focal length of the third lens 13 is f13, and the focal length of the fourth lens 14 is f14. The lenses within the first lens group 1 satisfy the following conditions: 0.097 < f1 / f11 < 0.132, and -0.709 < f1 / f12 < -0.524, and 0.415 < f1 / f13 < 0.561, and 0.324 < f1 / f14 < 0.438.

[0068] More specifically, in a specific embodiment, the first lens 11 is a convex-concave lens with a positive optical power, that is, the object side surface of the first lens 11 is a convex surface and the image side surface is a concave surface. The second lens 12 is a biconvex spherical lens with a negative optical power. The third lens 13 is a convex-concave spherical lens with a positive optical power. The fourth lens 14 is a convex-concave spherical lens with a positive optical power. Moreover, the ratio of the focal lengths of the first lens group 1 to each of its lenses is specifically as follows: f1 / f11 = -0.11; f1 / f12 = -0.60; f1 / f13 = 0.48; f1 / f14 = 0.37.

[0069] More specifically, in this embodiment, the focal length values of the first lens group 1 and each lens in the first lens group 1 are: f1 = 77.436; f11 = 691.6; f12 = -128.5; f13 = 162.3; f14 = 207.9.

[0070] Specifically, the second lens group 2 includes a fifth lens 21 with a negative optical power, a sixth lens 22 with a negative optical power, and a seventh lens 23 with a positive optical power, which are arranged in sequence from the object side to the image side; the fifth lens 21 is a glass aspherical lens, and the sixth lens 22 and the seventh lens 23 are glass spherical lenses; the sixth lens 22 and the seventh lens 23 are adhesively connected; the focal length of the fifth lens 21 is f21, the focal length of the sixth lens 22 is f22, and the focal length of the seventh lens 23 is f23. The lenses within the second lens group 2 satisfy the following conditions: 0.606 < f2 / f21 < 0.819, and 0.13 < f2 / f22 < 0.176, and -0.107 < f2 / f23 < -0.079.

[0071] More specifically, in this embodiment, the fifth lens 21 is a convex-concave lens with a negative optical power, that is, the object side of the fifth lens 21 is convex and the image side is concave. The sixth lens 22 is a double-concave spherical lens with a negative optical power, and the seventh lens 23 is a convex-concave spherical lens, that is, the object side of the seventh lens 23 is convex and the image side is concave. The focal length ratios of the second lens group 2 to each lens therein are as follows: f2 / f21 = 0.70; f2 / f22 = 0.15; f2 / f23 = -0.09.

[0072] More specifically, in this embodiment, the focal length values of the second lens group 2 and each lens in the second lens group 2 are: f2 = -13.72; f21 = -19.7; f22 = -91.5; f23 = 150.3.

[0073] Specifically, the third lens group 3 includes an eighth lens 31 with a positive optical power and a ninth lens 32 with a positive optical power, which are arranged in sequence from the object side to the image side. The eighth lens 31 is a glass aspherical lens, and the ninth lens 32 is a glass spherical lens. The focal length of the eighth lens 31 is f31, and the focal length of the ninth lens 32 is f32. The following conditions are satisfied for each lens in the third lens group 3: 0.442 < f3 / f31 < 0.599, and 0.457 < f3 / f32 < 0.618.

[0074] More specifically, in this embodiment, the eighth lens 31 is a double-convex spherical lens with a positive optical power, and the ninth lens 32 is a double-convex spherical lens with a positive optical power. The focal length ratios of the third lens group 3 to each lens therein are as follows: f3 / f31 = 0.51; f3 / f32 = 0.00.

[0075] More specifically, in this embodiment, the focal length values of the third lens group 3 and each lens in the third lens group 3 are: f3 = 27.629; f31 = 54.3; f32 = 52.6.

[0076] Specifically, the fourth lens group 4 includes a tenth lens 41 with a negative optical power, and the tenth lens 41 is a glass aspherical lens. More specifically, in this embodiment, the tenth lens 41 is a double-concave lens, and the focal length value of the tenth lens 41 is f41 = -36.1.

[0077] Specifically, the fifth lens group 5 includes an eleventh lens 51 with positive optical power, a twelfth lens 52 with negative optical power, and a thirteenth lens 53 with positive optical power, which are arranged in sequence from the object side to the image side; the eleventh lens 51 and the twelfth lens 52 are glass spherical lenses, and the thirteenth lens 53 is a glass aspherical lens; the eleventh lens 51 and the twelfth lens 52 are adhesively connected; the focal length of the eleventh lens 51 is f51, the focal length of the twelfth lens 52 is f52, and the focal length of the thirteenth lens 53 is f53. The following conditions are satisfied for each lens in the fifth lens group 5: 0.339 < f5 / f51 < 0.459, and -0.429 < f5 / f52 < -0.317, and 0.902 < f5 / f53 < 1.22.

[0078] More specifically, in this embodiment, the eleventh lens 51 is a convex lens with positive optical power, the twelfth lens 52 is a concave lens with negative optical power, and the thirteenth lens 53 is a biconvex lens with positive optical power; the ratio of the focal length of the fifth lens group 5 to that of each lens therein is as follows: f5 = 22.197; f5 / f51 = 0.39; f5 / f52 = -0.36; f5 / f53 = 1.04.

[0079] More specifically, in this embodiment, the focal length values of the fifth lens group 5 and each lens in the fifth lens group 5 are: f5 = 22.197; f51 = 56.9; f52 = -60.9; f53 = 21.4.

[0080] Specifically, the sixth lens group 6 includes a fourteenth lens 61 with negative optical power, and the fourteenth lens 61 is a glass aspherical lens. More specifically, in this embodiment, the fourteenth lens 61 is a meniscus lens, and the focal length value f61 of the fourteenth lens 61 = -54.9.

[0081] Specifically, in order to ensure the stability of the zoom optical system against temperature changes, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the sixth lens 22, the seventh lens 23, the ninth lens 32, the tenth lens 41, the eleventh lens 51, and the twelfth lens 52 are all glass spherical lenses. Since glass lenses are not easily affected by thermal expansion and contraction and do not suffer from focus shift, glass lenses can well resist the problem of lens deformation due to heat, maintain high precision of the lens for a long time, and reduce costs while ensuring image quality and reliability with spherical lenses, with lower assembly sensitivity and higher yield of finished products.

[0082] In this embodiment, the fifth lens 21, the eighth lens 31, the tenth lens 41, the thirteenth lens 53, and the fourteenth lens 61 are all glass aspherical lenses. The characteristics of aspherical lenses are as follows: from the center of the lens to the periphery of the lens, the curvature changes continuously. Different from spherical lenses with a constant curvature from the center of the lens to the periphery, aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and astigmatism aberration. After using aspherical lenses, it is possible to eliminate as much aberration as possible during imaging, thereby improving the imaging quality of the lens. And using lenses made of glass materials can reduce the influence of temperature on the optical performance of the lens.

[0083] Furthermore, in order to reduce light energy loss, increase imaging clarity, protect the scale surface, and further optimize the processing flow to meet the design requirements, in this embodiment, the first lens 11 and the second lens 12 are adhesively connected to form a first adhesive lens, the sixth lens 22 and the seventh lens 23 are adhesively connected to form a second adhesive lens, and the eleventh lens 51 and the twelfth lens 52 are adhesively connected to form a third adhesive lens. In this way, the adhesive parts are reasonably used to improve the image quality of the optical system by the optical components.

[0084] With such a setting, by reasonably distributing the lens optical power, adjusting the glass shape and material combination, chromatic aberration and secondary spectrum are effectively eliminated, and spherical aberration, coma, astigmatism, etc. on each lens are compensated and offset from each other to achieve a clear imaging effect and realize the optimal correction of higher-order aberrations and chromatic aberration.

[0085] Specifically, in a specific embodiment, the refractive index, curvature radius, and thickness interval of the lens materials are shown in the following table:

[0086]

[0087]

[0088]

[0089] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following conditions:

[0090]

[0091] Among them, c is the curvature corresponding to the radius, y is the radial coordinate (whose unit is the same as the unit of the lens length), k is the conic quadratic curve coefficient (when the k coefficient is less than -1, the surface curve is a hyperbola; when the k coefficient is equal to -1, it is a parabola; when the k coefficient is between -1 and 0, it is an ellipse; when the k coefficient is equal to 0, it is a circle; when the k coefficient is greater than 0, it is an oblate circle), and A, B, C, D, E, F, G are the high-order aspheric coefficients (please refer to Table 2 below). The shape and size of the aspheric surfaces on the object side and the image side of the lens can be set through the above parameters.

[0092] Table 2 Conic Coefficients and Aspheric Coefficients Corresponding to Aspheric Lenses

[0093]

[0094]

[0095] It can be understood that the surface of the photosensitive chip 7 facing the object side is the image plane.

[0096] Specifically, the zoom optical system further includes a diaphragm 8, and the diaphragm 8 is located between the second lens group 2 and the third lens group 3; that is, the diaphragm 8 is located between the seventh lens 23 and the eighth lens 31. In this embodiment, the zoom optical system satisfies the following condition: 0.401 < L / TTL < 0.49; where L is the distance from the diaphragm 8 to the image plane on the optical axis, and TTL is the overall optical length of the zoom optical system. It should be noted that the overall optical length is the distance from the center vertex of the object side surface of the first lens 11 to the image plane. In a specific embodiment, L = 64.9 mm.

[0097] In this embodiment, the ratio of the distance from the diaphragm 8 to the image plane to the overall optical length of the zoom optical system: L / TTL = 0.45.

[0098] Specifically, in this embodiment, the zoom optical system further includes a filter, and the filter is located between the sixth lens group 6 and the image plane. The filter is used to filter out unnecessary wavelength bands of light and stray light to reduce optical noise and make it easier for the subsequent optoelectronic module processing part. The filter can also be used to adjust the color degree of the object image during final imaging, thereby improving the imaging quality.

[0099] Specifically, the image plane can be understood as the surface of the photosensitive chip 7 facing the object side, that is, it can be the surface of a camera element such as a CCD or a CMOS. It can be understood that the light carrying the information of the object to be photographed can sequentially pass through the first lens group 1, the second lens group 2, the aperture 8, the third lens group 3, the fourth lens group 4, the fifth lens group 5, the sixth lens group 6, the filter and finally form an image on the image plane.

[0100] Specifically, the zoom optical system satisfies the following conditions: Wherein, is the effective aperture of the first lens 1111, and TTL is the overall optical length of the zoom optical system.

[0101] In this embodiment, the ratio of the effective aperture of the first lens 1111 to the overall optical length of the zoom optical system:

[0102] Specifically, the zoom optical system satisfies the following conditions: 0.233 < ΔZ1 W-T / TTL < 0.273; wherein, ΔZ1 W-T is the relative displacement of the second lens group 2 when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, and TTL is the overall optical length of the zoom optical system.

[0103] In this embodiment, the ratio of the movement amount of the second lens group 2 when the zoom optical system moves from the wide-angle end to the telephoto end to the overall optical length of the zoom optical system: ΔZ1 W-T / TTL = 0.25;

[0104] Specifically, the zoom optical system satisfies the following conditions: 0.066 < ΔZ2 W-T / TTL < 0.08; wherein, ΔZ2 W-T is the relative displacement of the third lens group 3 when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, and TTL is the overall optical length of the zoom optical system.

[0105] In this embodiment, the ratio of the movement amount of the third lens group 3 when the zoom optical system moves from the wide-angle end to the telephoto end to the overall optical length of the zoom optical system: ΔZ2 W-T / TTL = 0.073.

[0106] Specifically, the size of the image plane in this embodiment is set to φ9.2 mm, and the following performance parameters are achieved:

[0107] The focal length at the wide-angle end fw = 13.5 mm, and the focal length at the telephoto end ft = 202.3 mm; the aperture number Fno at the wide-angle end w = 1.1, and the aperture number Fno at the telephoto end T = 3.8; the range of optical distortion is between 3.18% and 1.38%; the overall optical length TTL of the zoom optical system = 145.8 mm.

[0108] Table 3 shows the zoom data of the zoom optical system at the wide-angle end, the intermediate magnification position, and the telephoto end

[0109] Wide angle Intermediate magnification Telephoto T(7) 14.90 47.44 51.09 T(13) 38.10 5.57 1.93 T(20) 11.09 3.36 13.70 T(26) 12.40 11.42 0.89

[0110] In this embodiment, please refer to Figures 1 to 3 , which are the schematic structural diagrams of the zoom optical system at the wide-angle end, the intermediate magnification, and the telephoto end; among them, the intermediate magnification can be understood as the position schematic diagram of each lens group in the zoom optical system when the zoom optical system is between the wide-angle end and the telephoto end.

[0111] Figures 4 to 5 Respectively show the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the zoom optical system at the wide-angle end. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0112] Please refer to Figures 6 to 7 , which are the aberration diagram, field curvature diagram, and distortion diagram of the zoom optical system at the intermediate magnification. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0113] Please refer to Figures 8 to 9 , which are the spherical aberration diagram, field curvature diagram, and distortion diagram of the zoom optical system at the telephoto end. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0114] As can be seen from the above figures, the spherical aberration, field curvature, and distortion of the zoom optical system in this embodiment at the intermediate magnification, wide-angle end, and telephoto end can all be well corrected.

[0115] As can be seen from the above figures, the spherical aberration, field curvature, and distortion of the zoom optical system in this embodiment at the intermediate magnification, wide-angle end, and telephoto end can all be well corrected.

[0116] In summary, the zoom optical system of the present invention adopts a six-group structure of "positive-negative-positive-negative-positive-negative". As the second lens group 2 and the fourth lens group 4 move correspondingly, the focal length changes. The fourth lens group 4 is used for focusing, and the focal length can vary from <13.5 mm at the wide-angle end to >202.3 mm at the telephoto end. The optical distortion at the wide-angle end and the telephoto end is between 3.18% and 1.38%, achieving the effects of wide angle, small distortion, and large magnification.

[0117] The distance position between the first lens group 1 and the photosensitive chip 7 is fixed, and the distance between the first lens group 1 and the photosensitive chip 7 is less than 145.8 mm.

[0118] In addition, the present invention also provides a camera device. The camera device includes the zoom optical system described in the above technical solution. Since the camera device includes the zoom optical system, the specific structure of this zoom optical system refers to the above embodiments. Since the zoom optical system of this camera device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0119] The above are only optional embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A zoom optical system, characterized in that, The zoom optical system has an object side and an image side that are oppositely arranged along the optical axis direction, and the zoom optical system includes: A lens barrel; and, A plurality of lens groups disposed within the lens barrel, including a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, a fifth lens group with a positive optical power, a sixth lens group with a negative optical power, and an image sensor chip arranged in sequence from the object side to the image side. Among them, the second lens group and the fourth lens group are movably arranged along the extending direction of the optical axis to zoom the zoom optical system, and the fifth lens group moves cooperatively along the optical axis direction to focus the zoom optical system; Wherein, the focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, the focal length of the sixth lens group is f6, and the zoom optical system satisfies the following conditions: 0.152 < fw / f1 < 0.205, and -1.157 < fw / f2 < -0.855, and 0.425 < fw / f3 < 0.575, and -0.439 < fw / f4 < -0.325, and 0.529 < fw / f5 < 0.715, and -0.289 < fw / f6 < -0.214; The first lens group includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with a positive optical power arranged in sequence from the object side to the image side; The second lens group includes a fifth lens with a negative optical power, a sixth lens with a negative optical power, and a seventh lens with a positive optical power arranged in sequence from the object side to the image side; The third lens group includes an eighth lens with a positive optical power and a ninth lens with a positive optical power arranged in sequence from the object side to the image side; The fourth lens group includes a tenth lens with a negative optical power; The fifth lens group includes an eleventh lens with a positive optical power, a twelfth lens with a negative optical power, and a thirteenth lens with a positive optical power arranged in sequence from the object side to the image side; The sixth lens group includes a fourteenth lens with a negative optical power.

2. The zoom optical system according to claim 1, wherein, The first lens, the second lens, the third lens, and the fourth lens are all glass spherical lenses; The first lens and the second lens are adhesively connected; The focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, the focal length of the third lens is f14, and the lenses within the first lens group satisfy the following conditions: 0.097 < f1 / f11 < 0.132, and -0.709 < f1 / f12 < -0.524, and 0.415 < f1 / f13 < 0.561, and 0.324 < f1 / f14 < 0.

438.

3. The zoom optical system according to claim 1, wherein The fifth lens is a glass aspherical lens, and the sixth and seventh lenses are glass spherical lenses; The sixth lens and the seventh lens are adhesively connected; The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23. The lenses within the second lens group satisfy the following conditions: 0.606 < f2 / f21 < 0.819, and 0.13 < f2 / f22 < 0.176, and -0.107 < f2 / f23 < -0.

079.

4. The zoom optical system according to claim 1, characterized in that, The eighth lens is a glass aspherical lens, and the ninth lens is a glass spherical lens; The focal length of the eighth lens is f31, the focal length of the ninth lens is f32. The lenses within the third lens group satisfy the following conditions: 0.442 < f3 / f31 < 0.599, and 0.457 < f3 / f32 < 0.

618.

5. The zoom optical system according to claim 1, characterized in that, The tenth lens is a glass aspherical lens; and / or, The fourteenth lens is a glass aspherical lens.

6. The zoom optical system according to claim 1, wherein, The eleventh and twelfth lenses are glass spherical lenses, and the thirteenth lens is a glass aspherical lens; The eleventh lens and the twelfth lens are adhesively connected; The focal length of the eleventh lens is f51, the focal length of the twelfth lens is f52, and the focal length of the thirteenth lens is f53. The lenses within the fifth lens group satisfy the following conditions: 0.339 < f5 / f51 < 0.459, and -0.429 < f5 / f52 < -0.317, and 0.902 < f5 / f53 < 1.

22.

7. The zoom optical system according to claim 1, wherein The zoom optical system satisfies the following condition: 0.346 < øL11 / TTL < 0.423; wherein, øL11 is the effective clear aperture of the first lens, and TTL is the overall optical length of the zoom optical system.

8. The zoom optical system according to claim 1, characterized in that, The zoom optical system satisfies the following conditions: 0.233 < ΔZ1W-T / TTL < 0.273, 0.066 < ΔZ2W-T / TTL < 0.08; wherein, ΔZ1W-T is the relative displacement of the second lens group when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, ΔZ2W-T is the relative displacement of the fourth lens group when the zoom optical system is in the wide-angle end position and when the zoom optical system is in the telephoto end position, and TTL is the overall optical length of the zoom optical system.

9. The zoom optical system according to claim 1, characterized in that, The zoom optical system further includes a diaphragm, and the diaphragm is located between the second lens group and the third lens group; wherein, the distance from the diaphragm to the image plane of the zoom optical system on the optical axis is L, and the overall optical length of the zoom optical system is TTL. Within the zoom optical system: 0.401 < L / TTL < 0.

49.

10. A camera device, characterized in that, Comprising the zoom optical system according to any one of claims 1 to 9.

Images