A continuous zoom tube lens and image pickup device

Abstract

The application discloses a kind of continuous zoom tube mirrors and image acquisition devices, the continuous zoom tube mirror includes: the first lens group with negative refractive power, the second lens group with negative refractive power, the third lens group with negative refractive power and the fourth lens group with positive refractive power are sequentially arranged from object plane to image plane direction;The continuous zoom tube mirror satisfies the following conditions: 0.0<|f2 / f1|<1.3;0.0<|f3 / f1|<1.4;0.0<|f4 / f1|<1.5;0.0<|f2 / f3|<2.0;Wherein, f1 is the focal distance of first lens group, f2 is the focal distance of second lens group, f3 is the focal distance of third lens group, f4 is the focal distance of fourth lens group.The application has the characteristics of large adjustable range of focal length, long working distance, high resolution performance and small chromatic aberration.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more specifically to a continuous zoom lens and an apparatus using the lens, such as a microscope equipped with the lens optical system and an image acquisition device equipped with the lens optical system. Background Technology

[0002] In recent years, with the rapid development of the biotechnology and electronics industries, modular combinations of objective lenses and continuously zoom tube lens optical systems have provided more and faster possibilities for microscopic observation. Typically, the imaging part of a microscope optical system can be divided into: objective lens, tube lens, prism system, and eyepiece. Magnification changes in a microscope optical system can be achieved by changing objective lenses, eyepieces, and tube lenses of different magnifications. Without changing the objective lenses and eyepieces through hardware, the magnification of the microscope optical system can be changed by directly adjusting the lens spacing within the tube lens to alter the focal distance. However, the imaging design of continuously zoom tube lenses not only requires coordination with different objective lenses but also needs to consider performance under continuous zoom to meet the overall requirements for high-resolution imaging at both wide-angle and telephoto focal lengths. For such optical systems, the design of on-axis aberration, magnification chromatic aberration, field curvature, and distortion correction presents certain challenges.

[0003] Chinese patent document CN202110572781.1, "A continuous zoom optical system with an external entrance pupil", has an adjustable focal length range of 100mm-400mm. For some application scenarios, the adjustable focal length range of 100mm-400mm is not large enough to meet the application needs. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a continuous zoom lens and image acquisition device, which has the characteristics of a large adjustable focal length range (-60mm~-720mm), long working distance, high resolution performance and small chromatic aberration.

[0005] The present invention adopts the following technical solution:

[0006] On the one hand, a continuous zoom lens consists of a first lens group with negative refractive power, a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power arranged sequentially from the object plane to the image plane; this enables the continuous zoom lens to have strong negative refractive power, thereby ensuring that the optical system of the continuous zoom lens has a larger zoom range and high optical performance.

[0007] In order for the continuous zoom lens optical system to have a wider zoom range and higher resolution, the continuous zoom lens must meet the following conditions:

[0008] 0.0 <|f2 / f1| < 1.3;

[0009] 0.0 <|f3 / f1| < 1.4;

[0010] 0.0 <|f4 / f1| < 1.5;

[0011] 0.0 <|f2 / f3| < 2.0;

[0012] Where f1 is the focal distance of the first lens group, f2 is the focal distance of the second lens group, f3 is the focal distance of the third lens group, and f4 is the focal distance of the fourth lens group.

[0013] Preferably, the second and third lens groups are zoom groups, and the focal length of the tube lens is changed by varying the optical spacing between the second lens group and the first lens group, the second lens group and the third lens group, and the third lens group and the fourth lens group.

[0014] Preferably, the first lens group is closest to the object plane and has two or more cemented lenses. Specifically, from the object plane to the image plane, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are arranged sequentially. The first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has negative refractive power, the eighth lens has positive refractive power, and the ninth lens has positive refractive power.

[0015] Preferably, the second lens group has a tenth lens and an eleventh lens arranged sequentially from the object plane to the image plane; the tenth lens has negative refractive power, and the eleventh lens has either positive or negative refractive power.

[0016] Preferably, the third lens group includes a twelfth lens arranged sequentially from the object plane to the image plane; the twelfth lens has negative refractive power.

[0017] Preferably, the fourth lens group comprises a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens arranged sequentially from the object plane to the image plane; the thirteenth lens has positive refractive power, the fourteenth lens has positive or negative refractive power, the fifteenth lens has positive or negative refractive power, the sixteenth lens has negative refractive power, the seventeenth lens has positive or negative refractive power, and the eighteenth lens has positive or negative refractive power.

[0018] Preferably, in order to better control distortion and field curvature, the first lens group, the second lens group, the third lens group, and the fourth lens group must satisfy the following condition:

[0019] 0.0 <|f11 / f1| < 2.6;

[0020] 0.0 <|f12 / f1|< 1.8;

[0021] 0.0 <|f13 / f1|< 1.9;

[0022] 0.0 <|f14 / f1|< 3.3;

[0023] 0.0 <|f15 / f1|< 1.5;

[0024] 0.0 <|f16 / f1|< 1.5;

[0025] 0.0 <|f17 / f1|< 2.3;

[0026] 0.0 <|f18 / f1|< 1.6;

[0027] 0.0 <|f19 / f1|< 1.4;

[0028] 0.0 <|f21 / f2|< 4.3;

[0029] 0.0 <|f22 / f2|< 3.5;

[0030] 0.0 <|f41 / f4|< 2.6;

[0031] 0.0 <|f42 / f4|<16.7;

[0032] 0.0 <|f43 / f4|<10.1;

[0033] 0.0 <|f44 / f4|< 3.9;

[0034] 0.0 <|f45 / f4|< 4.7;

[0035] 0.0 <|f46 / f4|< 6.0;

[0036] Wherein, f1 is the focal distance of the first lens group, f2 is the focal distance of the second lens group, f4 is the focal distance of the fourth lens group, f11 is the focal distance of the first lens, f12 is the focal distance of the second lens, f13 is the focal distance of the third lens, f14 is the focal distance of the fourth lens, f15 is the focal distance of the fifth lens, f16 is the focal distance of the sixth lens, f17 is the focal distance of the seventh lens, f18 is the focal distance of the eighth lens, f19 is the focal distance of the ninth lens, f21 is the focal distance of the tenth lens, f22 is the focal distance of the eleventh lens, f41 is the focal distance of the thirteenth lens, f42 is the focal distance of the fourteenth lens, f43 is the focal distance of the fifteenth lens, f44 is the focal distance of the sixteenth lens, f45 is the focal distance of the seventeenth lens, and f46 is the focal distance of the eighteenth lens.

[0037] On the other hand, an image capturing device includes the aforementioned continuous zoom lens.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] (1) The present invention sets the first lens group, the second lens group, the third lens group and the fourth lens group in the continuous zoom lens so that the first lens group has negative refractive power, the second lens group has negative refractive power, the third lens group has negative refractive power and the fourth lens group has positive refractive power. The focal distance of the entire optical system is changed by changing the interval between the second lens group and the third lens group in the optical system, so that the continuous zoom lens optical system has good optical performance.

[0040] (2) By limiting the focal distance of the first lens group, the second lens group, the third lens group and the fourth lens group, the field curvature, distortion and chromatic aberration of the optical system are further corrected, thereby ensuring the optical performance of the continuous zoom tube lens optical system, so that the tube lens optical system has the characteristics of large zoom range, high resolution performance and small chromatic aberration.

[0041] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0042] Figure 1 This is a lens configuration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -720mm;

[0043] Figure 2 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -720mm;

[0044] Figure 3This is a field curvature diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -720mm;

[0045] Figure 4 This is a distortion diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -720mm;

[0046] Figure 5 This is a lens configuration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -180mm;

[0047] Figure 6 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -180mm;

[0048] Figure 7 This is a field curvature diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -180mm;

[0049] Figure 8 This is a distortion diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -180mm;

[0050] Figure 9 This is a lens configuration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -60mm;

[0051] Figure 10 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -60mm;

[0052] Figure 11 This is a field curvature diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -60mm;

[0053] Figure 12 This is a distortion diagram of the continuous zoom lens of Embodiment 1 of the present invention when the focal distance f = -60mm;

[0054] Figure 13 This is a lens configuration diagram for the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -720mm;

[0055] Figure 14 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -720mm;

[0056] Figure 15 This is the field curvature diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -720mm;

[0057] Figure 16 This is a distortion diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -720mm;

[0058] Figure 17 This is a lens configuration diagram for the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -180mm;

[0059] Figure 18 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -180mm;

[0060] Figure 19 This is the field curvature diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -180mm;

[0061] Figure 20 This is a distortion diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -180mm;

[0062] Figure 21 This is a lens configuration diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -60mm;

[0063] Figure 22 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -60mm;

[0064] Figure 23 This is the field curvature diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -60mm;

[0065] Figure 24 This is a distortion diagram of the continuous zoom lens of Embodiment 2 of the present invention when the focal distance f = -60mm;

[0066] Figure 25 This is a lens configuration diagram for the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -720mm;

[0067] Figure 26 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -720mm;

[0068] Figure 27 This is the field curvature diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -720mm;

[0069] Figure 28 This is a distortion diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -720mm;

[0070] Figure 29 This is a lens configuration diagram for the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -180mm;

[0071] Figure 30 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -180mm;

[0072] Figure 31 This is the field curvature diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -180mm;

[0073] Figure 32 This is a distortion diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -180mm;

[0074] Figure 33 This is a lens configuration diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -60mm;

[0075] Figure 34 This is a spherical aberration diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -60mm;

[0076] Figure 35 This is the field curvature diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -60mm;

[0077] Figure 36 This is a distortion diagram of the continuous zoom lens of Embodiment 3 of the present invention when the focal distance f = -60mm. Detailed Implementation

[0078] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0079] The continuous zoom lens optical system and the image acquisition device equipped with the continuous zoom lens of the present invention will be described below with reference to the accompanying drawings.

[0080] Example 1

[0081] like Figure 1 As shown, the continuous zoom lens optical system OB01 of the first embodiment includes an object stop 700, a first lens group 71, a second lens group 72, a third lens group 73, a fourth lens group 74, and an image plane 750. Among them, the second lens group 72 and the third lens group 73 are zoom groups.

[0082] In the continuous zoom lens optical system of this embodiment:

[0083] The first lens 711 has a focal length f11 of 31.08, a refractive index N11 of 1.50, an Abbe number V11 of 81.6, and a thickness T11 of 6.93.

[0084] The second lens 712 has a focal length f12 of -25.27, a refractive index N12 of 1.76, an Abbe number V12 of 47.7, and a thickness T12 of 2.00.

[0085] The third lens 713 has a focal length f13 of 22.24, a refractive index N13 of 1.50, an Abbe number V13 of 81.6, and a thickness T13 of 10.42.

[0086] The fourth lens 714 has a focal length f14 of -34.86, a refractive index N14 of 1.62, an Abbe number V14 of 60.4, and a thickness T14 of 5.00.

[0087] The fifth lens 715 has a focal length f15 of -22.44, a refractive index N15 of 1.60, an Abbe number V15 of 60.6, and a thickness T15 of 2.00.

[0088] The sixth lens 716 has a focal length f16 of 22.67, a refractive index N16 of 1.85, an Abbe number V16 of 23.8, and a thickness T16 of 3.87.

[0089] The seventh lens 717 has a focal length f17 of -15.57, a refractive index N17 of 1.95, an Abbe number V17 of 17.9, and a thickness T17 of 5.00.

[0090] The eighth lens 718 has a focal length f18 of 13.59, a refractive index N18 of 1.50, an Abbe number V18 of 81.6, and a thickness T18 of 3.96.

[0091] The ninth lens 719 has a focal length f19 of 12.84, a refractive index N19 of 1.80, an Abbe number V19 of 46.6, and a thickness T19 of 3.21.

[0092] The tenth lens 721 has a focal length f21 of -7.14, a refractive index N21 of 1.79, an Abbe number V21 of 47.5, and a thickness T21 of 2.00.

[0093] The eleventh lens 722 has a focal length f22 of 14.33, a refractive index N22 of 1.95, an Abbe number V22 of 17.9, and a thickness T22 of 2.29.

[0094] The twelfth lens 731 has a focal length f31 of -20.64, a refractive index N31 of 1.50, an Abbe number V31 of 81.6, and a thickness T31 of 2.98.

[0095] The thirteenth lens 741 has a focal length f41 of 33.65, a refractive index N41 of 1.92, an Abbe number V41 of 20.9, and a thickness T41 of 6.58.

[0096] The fourteenth lens 742 has a focal length f42 of 34.08, a refractive index N42 of 1.50, an Abbe number V42 of 81.6, and a thickness T42 of 10.43.

[0097] The fifteenth lens 743 has a focal length f43 of -81.64, a refractive index N43 of 1.92, an Abbe number V43 of 20.9, and a thickness T43 of 2.00.

[0098] The sixteenth lens 744 has a focal length f44 of -28.84, a refractive index N44 of 1.95, an Abbe number V44 of 17.9, and a thickness T44 of 2.00.

[0099] The seventeenth lens 745 has a focal length f45 of 31.92, a refractive index N45 of 1.50, an Abbe number V45 of 81.6, and a thickness T45 of 10.36.

[0100] The eighteenth lens 746 has a focal length f46 of -139.64, a refractive index N46 of 1.95, an Abbe number V46 of 17.9, and a thickness T46 of 2.00. Other optical parameters of this tube lens are shown in Tables 1-1 and 1-2.

[0101] As shown in Tables 1-1 and 1-2, in the continuous zoom lens optical system OB01 of this embodiment, the focal length of the first lens group 71 is the combined focal length of the first lens 711 to the ninth lens 719, i.e., f1 is -87.62; the focal length of the second lens group 72 is the combined focal length of the tenth lens 721 to the eleventh lens 722, i.e., f2 is -11.23; the focal length of the third lens group 73 is the focal length of the twelfth lens 731, i.e., f3 is -20.64; and the focal length of the fourth lens group 74 is the combined focal length of the thirteenth lens 741 to the eighteenth lens 746, i.e., f4 is 29.31.

[0102] From the following, we know that |f2 / f1| is 0.13, |f3 / f1| is 0.24, |f4 / f1| is 0.33, |f2 / f3| is 0.54, |f11 / f1| is 0.35, |f12 / f1| is 0.29, |f13 / f1| is 0.25, |f14 / f1| is 0.40, |f15 / f1| is 0.26, |f16 / f1| is 0.26, and |f17 / f1| is 0.26. |f18 / f1| is 0.18, |f19 / f1| is 0.15, |f21 / f2| is 0.64, |f22 / f2| is 1.28, |f41 / f4| is 1.15, |f42 / f4| is 1.16, |f43 / f4| is 2.79, |f44 / f4| is 0.98, |f45 / f4| is 1.09, and |f46 / f4| is 4.76. Continuous zoom lens optical systems within the focal length range offer a large zoom range and also allow for better control of distortion and field curvature.

[0103] In Table 1-2, D1 represents the optical interval between the first lens group and the second lens group, D2 represents the optical interval between the second lens group and the third lens group, and D3 represents the optical interval between the third lens group and the fourth lens group.

[0104] Table 1-1;

[0105]

[0106] Table 1-2;

[0107]

[0108] Figures 1 to 12 This is an example of the lens configuration diagram and aberration diagram of the continuous zoom lens optical system at different focal distances. The various aberrations presented show that when the aberrations are relatively small, a better quality image can be observed.

[0109] Specifically, Figure 1 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention when f=-720mm.

[0110] Figure 2 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-720mm, as shown below. Figure 2 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 2 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.8mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0111] Figure 3 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-720mm, as shown below. Figure 3 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 3 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0112] Figure 4 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-720mm, as shown below. Figure 4 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0113] Figure 5 This is a lens configuration diagram of the continuous zoom tube lens optical system of Embodiment 1 of the present invention when f=-180mm.

[0114] Figure 6 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-180mm, as shown below. Figure 6 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 6 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0115] Figure 7 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-180mm, as shown below. Figure 7 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 7 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0116] Figure 8 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-180mm, as shown below. Figure 8As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0117] Figure 9 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention when f=-60mm.

[0118] Figure 10 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-60mm, as shown below. Figure 10 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 10 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0119] Figure 11 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-60mm, as shown below. Figure 11 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 11 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0120] Figure 12 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 1 of the present invention at f=-60mm, as shown below. Figure 12 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0121] Example 2

[0122] like Figure 13 As shown, the structure of the continuous zoom lens optical system OB02 in this embodiment is similar to that in embodiment one, and it also includes a first lens group 71, a second lens group 72, a third lens group 73, and a fourth lens group 74. The optical parameters of each lens are slightly different from those in embodiment one.

[0123] Specifically, in the continuous zoom lens optical system of this embodiment two:

[0124] The first lens 711 has a focal length f11 of 119.73, a refractive index N11 of 1.50, an Abbe number V11 of 81.6, and a thickness T11 of 6.92.

[0125] The second lens 712 has a focal length f12 of -52.64, a refractive index N12 of 1.76, an Abbe number V12 of 47.7, and a thickness T12 of 2.00.

[0126] The third lens 713 has a focal length f13 of 58.79, a refractive index N13 of 1.50, an Abbe number V13 of 81.6, and a thickness T13 of 10.43.

[0127] The fourth lens 714 has a focal length f14 of -176.88, a refractive index N14 of 1.62, an Abbe number V14 of 60.4, and a thickness T14 of 4.88.

[0128] The fifth lens 715 has a focal length f15 of -22.40, a refractive index N15 of 1.60, an Abbe number V15 of 60.6, and a thickness T15 of 2.25.

[0129] The sixth lens 716 has a focal length f16 of 22.42, a refractive index N16 of 1.85, an Abbe number V16 of 23.8, and a thickness T16 of 5.69.

[0130] The seventh lens 717 has a focal length f17 of -96.44, a refractive index N17 of 1.95, an Abbe number V17 of 17.9, and a thickness T17 of 6.73.

[0131] The eighth lens 718 has a focal length f18 of 33.29, a refractive index N18 of 1.50, an Abbe number V18 of 81.6, and a thickness T18 of 3.98.

[0132] The ninth lens 719 has a focal length f19 of 12.87, a refractive index N19 of 1.80, an Abbe number V19 of 46.6, and a thickness T19 of 3.07.

[0133] The tenth lens 721 has a focal length f21 of -35.28, a refractive index N21 of 1.79, an Abbe number V21 of 47.5, and a thickness T21 of 2.00.

[0134] The eleventh lens 722 has a focal length f22 of -26.68, a refractive index N22 of 1.95, an Abbe number V22 of 17.9, and a thickness T22 of 2.25.

[0135] The twelfth lens 731 has a focal length f31 of -20.43, a refractive index N31 of 1.50, an Abbe number V31 of 81.6, and a thickness T31 of 2.00.

[0136] The thirteenth lens 741 has a focal length f41 of 37.76, a refractive index N41 of 1.92, an Abbe number V41 of 20.9, and a thickness T41 of 6.26.

[0137] The fourteenth lens 742 has a focal length f42 of 424.74, a refractive index N42 of 1.50, an Abbe number V42 of 81.6, and a thickness T42 of 8.74.

[0138] The fifteenth lens 743 has a focal length f43 of 243.76, a refractive index N43 of 1.92, an Abbe number V43 of 20.9, and a thickness T43 of 2.00.

[0139] The sixteenth lens 744 has a focal length f44 of -75.39, a refractive index N44 of 1.95, an Abbe number V44 of 17.9, and a thickness T44 of 2.00.

[0140] The seventeenth lens 745 has a focal length f45 of 66.29, a refractive index N45 of 1.50, an Abbe number V45 of 81.6, and a thickness T45 of 10.84.

[0141] The eighteenth lens 746 has a focal length f46 of -130.29, a refractive index N46 of 1.95, an Abbe number V46 of 17.9, and a thickness T46 of 2.00.

[0142] Other optical parameters of this continuous zoom lens are shown in Tables 2-1 and 2-2.

[0143] As shown in Tables 1-1 and 1-2, in the continuous zoom lens optical system OB02 of this embodiment, the focal length of the first lens group 71 is the combined focal length of the first lens 711 to the ninth lens 719, i.e., f1 is -84.72; the focal length of the second lens group 72 is the combined focal length of the tenth lens 721 to the eleventh lens 722, i.e., f2 is -11.37; the focal length of the third lens group 73 is the focal length of the twelfth lens 731, i.e., f3 is -20.43; and the focal length of the fourth lens group 74 is the combined focal length of the thirteenth lens 741 to the eighteenth lens 746, i.e., f4 is 27.42.

[0144] From the following, we can see that |f2 / f1| is 0.13, |f3 / f1| is 0.24, |f4 / f1| is 0.32, |f2 / f3| is 0.56, |f11 / f1| is 1.41, |f12 / f1| is 0.62, |f13 / f1| is 0.69, |f14 / f1| is 2.09, |f15 / f1| is 0.26, |f16 / f1| is 0.26, and |f17 / f1| is 0.26. The values ​​are: |f18 / f1| = 1.14, |f19 / f1| = 0.39, |f21 / f2| = 3.10, |f22 / f2| = 2.35, |f41 / f4| = 1.38, |f42 / f4| = 15.49, |f43 / f4| = 8.89, |f44 / f4| = 2.75, |f45 / f4| = 2.42, and |f46 / f4| = 4.75. Continuous zoom lens optical systems within the focal length range offer a large zoom range and also allow for better control of distortion and field curvature.

[0145] In Table 2-2, D1 represents the optical interval between the first lens group and the second lens group, D2 represents the optical interval between the second lens group and the third lens group, and D3 represents the optical interval between the third lens group and the fourth lens group.

[0146] Table 2-1;

[0147]

[0148] Table 2-2;

[0149]

[0150] Figures 13 to 24 This is the second embodiment, showing the lens configuration and aberration diagrams of the continuous zoom lens optical system at different focal distances. The various aberrations presented show that when the aberrations are relatively small, a better quality image can be observed.

[0151] Specifically, Figure 13 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention when f=-720mm.

[0152] Figure 14 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-720mm, as shown below. Figure 14 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 14 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±1.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0153] Figure 15 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-720mm, as shown below. Figure 15 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 15 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0154] Figure 16 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-720mm, as shown below. Figure 16 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0155] Figure 17 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention when f=-180mm.

[0156] Figure 18 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-180mm, as shown below. Figure 18 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 18 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0157] Figure 19 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-180mm, as shown below. Figure 19 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 19 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0158] Figure 20 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-180mm, as shown below. Figure 20As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0159] Figure 21 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention when f=-60mm.

[0160] Figure 22 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-60mm, as shown below. Figure 22 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 22 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0161] Figure 23 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-60mm, as shown below. Figure 23 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 23 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0162] Figure 24 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 2 of the present invention at f=-60mm, as shown below. Figure 24 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0163] Example 3

[0164] like Figure 25 As shown, the structure of the continuous zoom lens optical system OB03 in this embodiment is similar to that in embodiment one, and it also includes a first lens group 71, a second lens group 72, a third lens group 73, and a fourth lens group 74. The optical parameters of each lens are slightly different from those in embodiment one.

[0165] Specifically, in the continuous zoom lens optical system of this embodiment two:

[0166] The first lens 711 has a focal length f11 of 31.37, a refractive index N11 of 1.50, an Abbe number V11 of 81.6, and a thickness T11 of 6.88.

[0167] The second lens 712 has a focal length f12 of -25.64, a refractive index N12 of 1.76, an Abbe number V12 of 47.7, and a thickness T12 of 2.00.

[0168] The third lens 713 has a focal length f13 of 22.29, a refractive index N13 of 1.50, an Abbe number V13 of 81.6, and a thickness T13 of 10.42.

[0169] The fourth lens 714 has a focal length f14 of -35.03, a refractive index N14 of 1.62, an Abbe number V14 of 60.4, and a thickness T14 of 5.00.

[0170] The fifth lens 715 has a focal length f15 of -23.51, a refractive index N15 of 1.60, an Abbe number V15 of 60.6, and a thickness T15 of 2.06.

[0171] The sixth lens 716 has a focal length f16 of 24.08, a refractive index N16 of 1.85, an Abbe number V16 of 23.8, and a thickness T16 of 4.38.

[0172] The seventh lens 717 has a focal length f17 of -14.83, a refractive index N17 of 1.95, an Abbe number V17 of 17.9, and a thickness T17 of 5.00.

[0173] The eighth lens 718 has a focal length f18 of 13.42, a refractive index N18 of 1.50, an Abbe number V18 of 81.6, and a thickness T18 of 4.11.

[0174] The ninth lens 719 has a focal length f19 of 12.58, a refractive index N19 of 1.80, an Abbe number V19 of 46.6, and a thickness T19 of 3.30.

[0175] The tenth lens 721 has a focal length f21 of -6.98, a refractive index N21 of 1.79, an Abbe number V21 of 47.5, and a thickness T21 of 2.00.

[0176] The eleventh lens 722 has a focal length f22 of 14.17, a refractive index N22 of 1.95, an Abbe number V22 of 17.9, and a thickness T22 of 2.26.

[0177] The twelfth lens 731 has a focal length f31 of -19.80, a refractive index N31 of 1.50, an Abbe number V31 of 81.6, and a thickness T31 of 2.00.

[0178] The thirteenth lens 741 has a focal length f41 of 40.03, a refractive index N41 of 1.92, an Abbe number V41 of 20.9, and a thickness T41 of 5.70.

[0179] The fourteenth lens 742 has a focal length f42 of -85.31, a refractive index N42 of 1.92, an Abbe number V42 of 20.9, and a thickness T42 of 2.00.

[0180] The fifteenth lens 743 has a focal length f43 of 37.14, a refractive index N43 of 1.50, an Abbe number V43 of 81.6, and a thickness T43 of 9.16.

[0181] The sixteenth lens 744 has a focal length f44 of -43.07, a refractive index N44 of 1.95, an Abbe number V44 of 17.9, and a thickness T44 of 2.00.

[0182] The seventeenth lens 745 has a focal length f45 of -102.56, a refractive index N45 of 1.95, an Abbe number V45 of 17.9, and a thickness T45 of 2.00.

[0183] The eighteenth lens 746 has a focal length f46 of 31.30, a refractive index N46 of 1.50, an Abbe number V46 of 81.6, and a thickness T46 of 10.71.

[0184] Other optical parameters of this continuous zoom lens are shown in Tables 3-1 and 3-2.

[0185] As shown in Tables 3-1 and 3-2, in the continuous zoom lens optical system OB03 of this embodiment, the focal length of the first lens group 71 is the combined focal length of the first lens 711 to the ninth lens 719, i.e., f1 is -87.43; the focal length of the second lens group 72 is the combined focal length of the tenth lens 721 to the eleventh lens 722, i.e., f2 is -11.92; the focal length of the third lens group 73 is the focal length of the twelfth lens 731, i.e., f3 is -19.80; and the focal length of the fourth lens group 74 is the combined focal length of the thirteenth lens 741 to the eighteenth lens 746, i.e., f4 is 29.67.

[0186] From the following, we can see that |f2 / f1| is 0.14, |f3 / f1| is 0.23, |f4 / f1| is 0.34, |f2 / f3| is 0.60, |f11 / f1| is 1.36, |f12 / f1| is 0.29, |f13 / f1| is 0.25, |f14 / f1| is 0.40, |f15 / f1| is 0.27, |f16 / f1| is 0.28, and |f17 / f1| is 0.28. The values ​​are as follows: |f18 / f1| = 0.17, |f19 / f1| = 0.14, |f21 / f2| = 0.59, |f22 / f2| = 1.19, |f41 / f4| = 1.35, |f42 / f4| = 2.88, |f43 / f4| = 1.25, |f44 / f4| = 1.45, |f45 / f4| = 3.46, and |f46 / f4| = 1.05. Continuous zoom lens optical systems within the focal length range offer a large zoom range and also allow for better control of distortion and field curvature.

[0187] In Table 3-2, D1 represents the optical interval between the first lens group and the second lens group, D2 represents the optical interval between the second lens group and the third lens group, and D3 represents the optical interval between the third lens group and the fourth lens group.

[0188] Table 3-1;

[0189]

[0190] Table 3-2;

[0191]

[0192] Figures 25 to 36 This is the lens configuration diagram and aberration diagram of the continuous zoom lens optical system at different focal distances in this embodiment three. The various aberrations presented show that when the aberrations are relatively small, a better quality image can be observed.

[0193] Specifically, Figure 25 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention when f=-720mm.

[0194] Figure 26 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-720mm, as shown below. Figure 26 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 26 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±2.0mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0195] Figure 27 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-720mm, as shown below. Figure 27 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 27 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.8mm, resulting in optimal center resolution.

[0196] Figure 28 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-720mm, as shown below. Figure 28 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0197] Figure 29 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention when f=-180mm.

[0198] Figure 30 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-180mm, as shown below. Figure 30 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 30 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0199] Figure 31 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-180mm, as shown below. Figure 31 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 31 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0200] Figure 32 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-180mm, as shown below. Figure 32As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0201] Figure 33 This is a lens configuration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention when f=-60mm.

[0202] Figure 34 This is a spherical aberration diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-60mm, as shown below. Figure 34 As shown, the horizontal axis represents spherical aberration in mm, and the vertical axis represents image height in mm. Figure 34 As shown, the solid line represents the d-line, the dashed line represents the C-line, the single-dotted line represents the F-line, and the double-dotted line represents the g-line. The spherical aberration of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in the optimal center resolution of the continuous zoom lens optical system.

[0203] Figure 35 This is the field curvature diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-60mm, as shown below. Figure 35 As shown, the horizontal axis represents the object surface movement in mm, and the vertical axis represents the image height in mm. Figure 35 As shown, solid lines represent the sagittal of light relative to each wavelength, and dashed lines represent the meridional of each wavelength. The field curvature distribution indicates that the field curvature of this continuous zoom lens optical system is controlled within ±0.5mm, resulting in optimal center resolution.

[0204] Figure 36 This is a distortion diagram of the continuous zoom lens optical system of Embodiment 3 of the present invention at f=-60mm, as shown below. Figure 36 As shown, the horizontal axis represents distortion (%), and the vertical axis represents image height (mm). The distortion distribution indicates that the distortion of this continuous zoom lens optical system is controlled within ±1%, resulting in optimal center resolution.

[0205] According to another aspect of the present invention, an image acquisition device is provided, comprising an optical system equipped with the aforementioned continuous zoom lens, for acquiring sample images. Specifically, the specific structure and parameter settings of the continuous zoom lens are the same as described above, and will not be repeated here.

[0206] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A continuous zoom tube lens characterized by, It consists of a first lens group with negative refractive power, a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power arranged sequentially from the object plane to the image plane. The continuous zoom lens satisfies the following conditions: 0.0 <|f2 / f1| < 1.3; 0.0 <|f3 / f1| < 1.4; 0.0 <|f4 / f1| < 1.5; 0.0 <|f2 / f3| < 2.0; Where f1 is the focal distance of the first lens group, f2 is the focal distance of the second lens group, f3 is the focal distance of the third lens group, and f4 is the focal distance of the fourth lens group.

2. The continuous zoom tube lens of claim 1, wherein, The second and third lens groups are zoom groups, and the focal length of the tube lens is changed by varying the optical spacing between the second lens group and the first lens group, the second lens group and the third lens group, and the third lens group and the fourth lens group.

3. The continuous zoom lens according to claim 1, characterized in that, The first lens group is closest to the object plane and has two or more cemented lenses. Specifically, from the object plane to the image plane, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are arranged sequentially. The first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has negative refractive power, the eighth lens has positive refractive power, and the ninth lens has positive refractive power.

4. The continuous zoom lens according to claim 3, characterized in that, The second lens group has a tenth lens and an eleventh lens arranged sequentially from the object plane to the image plane; the tenth lens has negative refractive power, and the eleventh lens has either positive or negative refractive power.

5. The continuous zoom lens according to claim 4, characterized in that, The third lens group includes a twelfth lens arranged sequentially from the object plane to the image plane; the twelfth lens has negative refractive power.

6. The continuous zoom lens according to claim 5, characterized in that, The fourth lens group comprises, from the object plane to the image plane, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens; the thirteenth lens has positive refractive power, the fourteenth lens has either positive or negative refractive power, the fifteenth lens has either positive or negative refractive power, the sixteenth lens has negative refractive power, the seventeenth lens has either positive or negative refractive power, and the eighteenth lens has either positive or negative refractive power.

7. The continuous zoom lens according to claim 6, characterized in that, The first lens group, the second lens group, the third lens group, and the fourth lens group satisfy the following condition: 0.0 <|f11 / f1| < 2.6; 0.0 <|f12 / f1| < 1.8; 0.0 <|f13 / f1| < 1.9; 0.0 <|f14 / f1| < 3.3; 0.0 <|f15 / f1| < 1.5; 0.0 <|f16 / f1| < 1.5; 0.0 <|f17 / f1| < 2.3; 0.0 <|f18 / f1| < 1.6; 0.0 <|f19 / f1| < 1.4; 0.0 <|f21 / f2| < 4.3; 0.0 <|f22 / f2| < 3.5; 0.0 <|f41 / f4| < 2.6; 0.0 <|f42 / f4| < 16.7; 0.0 <|f43 / f4| < 10.1; 0.0 <|f44 / f4| < 3.9; 0.0 <|f45 / f4| < 4.7; 0.0 <|f46 / f4| < 6.0; Wherein, f1 is the focal distance of the first lens group, f2 is the focal distance of the second lens group, f4 is the focal distance of the fourth lens group, f11 is the focal distance of the first lens, f12 is the focal distance of the second lens, f13 is the focal distance of the third lens, f14 is the focal distance of the fourth lens, f15 is the focal distance of the fifth lens, f16 is the focal distance of the sixth lens, f17 is the focal distance of the seventh lens, f18 is the focal distance of the eighth lens, f19 is the focal distance of the ninth lens, f21 is the focal distance of the tenth lens, f22 is the focal distance of the eleventh lens, f41 is the focal distance of the thirteenth lens, f42 is the focal distance of the fourteenth lens, f43 is the focal distance of the fifteenth lens, f44 is the focal distance of the sixteenth lens, f45 is the focal distance of the seventeenth lens, and f46 is the focal distance of the eighteenth lens.

8. An image capturing device, characterized in that, Including the continuous zoom lens as described in any one of claims 1 to 7.

Images