A wide-range zoom lens

Abstract

The invention discloses a wide-range zoom lens, comprising: a first lens with a negative focal length, a second lens with a positive focal length, a third lens with a positive focal length, a fourth lens with a negative focal length, a fifth lens with a negative focal length, a sixth lens with a positive focal length, an aperture, a seventh lens with a positive focal length, an eighth lens with a positive focal length, a ninth lens with a negative focal length, a tenth lens with a positive focal length, an eleventh lens with a positive focal length, a twelfth lens with a negative focal length, a thirteenth lens with a negative focal length, a fourteenth lens with a positive focal length, and a protective glass, which are arranged in sequence from the object side to the image side along the optical axis. The invention effectively reduces the distortion of the zoom lens and improves the camera effect. The zoom lens of the patent has the characteristics of zooming, variable aperture, low distortion, and high resolution to meet the needs of the market.

Description

Technical Field

[0001] The invention relates to a wide-range zoom lens. Background Art

[0002] A zoom lens is a camera lens that can change its focal length within a certain range, thereby obtaining different widths of field angles, different sizes of images, and different ranges of scenery. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very helpful for picture composition.

[0003] The biggest feature of a zoom lens, or its greatest value, is that it enables the focal length of the lens to be changed according to the photographer's wishes. Unlike a fixed focal length lens, a zoom lens does not rely on quick lens replacement to achieve lens focal length change, but rather achieves lens focal length change by pushing, pulling or rotating the zoom ring of the lens. Within the zoom range of the lens, the focal length can be changed steplessly, that is, any focal length within the zoom range can be used for photography, which creates conditions for achieving diversified composition.

[0004] Any focal length of a zoom lens has the same function as other fixed focal length lenses of the same focal length. However, a zoom lens does not restrict the photographer to use a certain focal length, so it is much more convenient and flexible in operation. It saves the trouble of carrying and changing multiple lenses of different focal lengths when shooting outdoors. Even before pressing the shutter of the camera, the photographer can change the focal length of the lens to choose the subject and crop the picture, so as to arrange the picture composition more ideally before shooting. The speed of changing the focal length of a zoom lens is incomparable to that of changing the focal length of a fixed focal length lens by changing the lens. Existing zoom lenses are prone to distortion, unclear pictures, low resolution, and small aperture values. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in existing products and provide a wide-range zoom lens.

[0006] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0007] A wide-range zoom lens, comprising: a first lens with a negative focal length, a second lens with a positive focal length, a third lens with a positive focal length, a fourth lens with a negative focal length, a fifth lens with a negative focal length, a sixth lens with a positive focal length, a diaphragm, a seventh lens with a positive focal length, an eighth lens with a positive focal length, a ninth lens with a negative focal length, a tenth lens with a positive focal length, an eleventh lens with a positive focal length, a twelfth lens with a negative focal length, a thirteenth lens with a negative focal length, a fourteenth lens with a positive focal length, and a protective glass, which are arranged in sequence from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens form a first lens group; the fourth lens, the fifth lens, and the sixth lens form a second lens group; the diaphragm, the seventh lens, the eighth lens, and the ninth lens form a third lens group; the tenth lens, the eleventh lens, and the twelfth lens form a fourth lens group; and the thirteenth lens and the fourteenth lens form a fifth lens group.

[0008] Preferably, the first lens, the second lens, the fifth lens, the sixth lens, the eighth lens, the ninth lens, the eleventh lens, and the twelfth lens are all cemented doublet lenses.

[0009] Preferably, the object-side surfaces of the first lens, the second lens, and the third lens are all convex lenses.

[0010] Preferably, the range of the focal length f1 of the first lens is -85.2 < f1 < -61.2, and the range of the ratio of the focal length f5 of the fifth lens to the focal length f4 of the fourth lens is 0.75 < f5 / f4 < 1.88.

[0011] Preferably, the range of the ratio of the focal length f7 of the seventh lens to the focal length f9 of the ninth lens is -3.15 < f7 / f9 < -1.17, the range of the focal length f11 of the eleventh lens is 12.8 < f11 < 16.4, and the range of the ratio of the focal length f13 of the thirteenth lens to the focal length f14 of the fourteenth lens is -2.15 < f13 / f14 < -0.67.

[0012] Preferably, the range of the focal length f(G1) of the first lens group is 50.6 < f(G1) < 65.9, the range of the focal length f(G2) of the second lens group is -23.4 < f(G2) < -8.6, the range of the focal length f(G3) of the third lens group is 13.8 < f(G3) < 35.9, and the range of the ratio of the focal length f(G5) of the fifth lens group to the focal length f(G4) of the fourth lens group is: 1.49 < f(G5) / f(G4) < 3.07.

[0013] Preferably, the refractive index nd1 and the dispersion coefficient vd1 of the first lens satisfy: 1.56 < nd1 < 1.81, 25 < vd1 < 48; the refractive index nd2 and the dispersion coefficient vd2 of the second lens satisfy: nd2 < 1.55, vd2 > 60; the refractive index nd4 and the dispersion coefficient vd4 of the fourth lens satisfy: 1.56 < nd4 < 1.81, 37 < vd4 < 56.

[0014] Preferably, the refractive index nd6 and the dispersion coefficient vd6 of the sixth lens satisfy: nd6 > 1.95, vd6 < 34; the refractive index nd7 and the dispersion coefficient vd7 of the seventh lens satisfy: 1.45 < nd7 < 1.66, 57 < vd7 < 75; the refractive index nd9 and the dispersion coefficient vd9 of the ninth lens satisfy: 1.77 < nd9 < 1.85, vd9 < 44; the refractive index nd12 and the dispersion coefficient vd12 of the twelfth lens satisfy: nd12 > 1.80, vd12 < 35; the refractive index nd13 and the dispersion coefficient vd13 of the thirteenth lens of the optical lens satisfy: 1.50 < nd13 < 1.65, 58 < vd13 < 66.

[0015] Preferably, the focal length f of the large-range zoom lens satisfies: 6.25 ≤ f ≤ 52.5.

[0016] The beneficial effects of the present invention are as follows: The present invention achieves the function of changing the focal length by adjusting the moving position of the second lens group, adjusts the moving position of the fourth lens group to compensate for focusing to obtain a clear picture, changes the size of the aperture by adjusting the size of the diaphragm, thereby adjusting the brightness of the picture, and effectively reduces the distortion of the zoom lens and improves the imaging effect by reasonably using each lens and limiting the optical power of each lens. The zoom lens of this patent takes into account the characteristics of zooming, variable aperture, low distortion, and high resolution to meet the market demand. Description of the Drawings

[0017] Figure 1 It is a structural diagram of a zoom lens with a focal length f of 6.25 mm according to Embodiment 1 of the present invention;

[0018] Figure 2 It is an MTF analysis diagram of a zoom lens with a focal length f of 6.25 mm according to Embodiment 1 of the present invention;

[0019] Figure 3 It is a Spot diagram of a zoom lens with a focal length f of 6.25 mm according to Embodiment 1 of the present invention;

[0020] Figure 4 It is a field curvature diagram of a zoom lens with a focal length f of 6.25 mm according to Embodiment 1 of the present invention;

[0021] Figure 5: is an optical distortion diagram of the zoom lens with a focal length f of 6.25 mm according to Example 1 of the present invention;

[0022] Figure 6 is a defocus curve diagram of the zoom lens with a focal length f of 6.25 mm according to Example 1 of the present invention;

[0023] Figure 7 is a structural diagram of a zoom lens with a focal length f of 52.5 mm according to Embodiment 2 of the present invention;

[0024] Figure 8 This is the MTF analysis diagram of the zoom lens with a focal length f of 52.5 mm according to Example 2 of the present invention;

[0025] Fig. 9 The spot image of the zoom lens with a focal length f of 52.5 mm according to Embodiment 2 of the present invention;

[0026] Fig.10 is a field curvature diagram of the zoom lens with a focal length f of 52.5 mm according to Embodiment 2 of the present invention;

[0027] Fig.11 : is an optical distortion diagram of the zoom lens with a focal length f of 52.5 mm according to Example 2 of the present invention;

[0028] Fig.12 This is a defocus curve diagram of the zoom lens with a focal length f of 52.5 mm according to Example 2 of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0030] Embodiment 1:

[0031] like Figure 1As shown in the figure, a wide-range zoom lens includes: a first lens E1 with a negative focal length, a second lens E2 with a positive focal length, a third lens E3 with a positive focal length, a fourth lens E4 with a negative focal length, a fifth lens E5 with a negative focal length, a sixth lens E6 with a positive focal length, a diaphragm STO, a seventh lens E7 with a positive focal length, an eighth lens E8 with a positive focal length, a ninth lens E9 with a negative focal length, a tenth lens E10 with a positive focal length, an eleventh lens E11 with a positive focal length, a twelfth lens E12 with a negative focal length, a thirteenth lens E13 with a negative focal length, a fourteenth lens E14 with a positive focal length, and a protective glass B, which are arranged in sequence along the optical axis from the object side to the image side. The first lens E1, the second lens E2, and the third lens E3 form a first lens group G1. The fourth lens E4, the fifth lens E5, and the sixth lens E6 form a second lens group G2. The diaphragm STO, the seventh lens E7, the eighth lens E8, and the ninth lens E9 form a third lens group G3. The tenth lens E10, the eleventh lens E11, and the twelfth lens E12 form a fourth lens group G4. The thirteenth lens E13 and the fourteenth lens E14 form a fifth lens group G5.

[0032] As Figure 1 shown in the figure, the first lens E1, the second lens E2, the fifth lens E5, the sixth lens E6, the eighth lens E8, the ninth lens E9, the eleventh lens E11, and the twelfth lens E12 are all cemented doublet lenses. The object-side surfaces of the first lens E1, the second lens E2, and the third lens E3 are all convex lenses. The range of the focal length f1 of the first lens E1 is -85.2 < f1 < -61.2. The range of the ratio of the focal length f5 of the fifth lens E5 to the focal length f4 of the fourth lens E4 is 0.75 < f5 / f4 < 1.88. The range of the ratio of the focal length f7 of the seventh lens E7 to the focal length f9 of the ninth lens E9 is -3.15 < f7 / f9 < -1.17. The range of the focal length f11 of the eleventh lens E11 is 12.8 < f11 < 16.4. The range of the ratio of the focal length f13 of the thirteenth lens E13 to the focal length f14 of the fourteenth lens E14 is -2.15 < f13 / f14 < -0.67.

[0033] As Figure 1As shown, the focal length f(G1) of the first lens group G1 ranges from 50.6 < f(G1) < 65.9, the focal length f(G2) of the second lens group G2 ranges from -23.4 < f(G2) < -8.6, the focal length f(G3) of the third lens group G3 ranges from 13.8 < f(G3) < 35.9, and the ratio of the focal length f(G5) of the fourth lens group G4 to the focal length f(G5) of the fifth lens group G5 ranges from: 1.49 < f(G5) / f(G4) < 3.07. The refractive index nd1 and the dispersion coefficient vd1 of the first lens E1 satisfy: 1.56 < nd1 < 1.81, 25 < vd1 < 48; the refractive index nd2 and the dispersion coefficient vd2 of the second lens E2 satisfy: nd2 < 1.55, vd2 > 60; the refractive index nd4 and the dispersion coefficient vd4 of the fourth lens E4 satisfy: 1.56 < nd4 < 1.81, 37 < vd4 < 56, and the refractive index nd6 and the dispersion coefficient vd6 of the sixth lens E6 satisfy: nd6 > 1.95, vd6 < 34; the refractive index nd7 and the dispersion coefficient vd7 of the seventh lens E7 satisfy: 1.45 < nd7 < 1.66, 57 < vd7 < 75; the refractive index nd9 and the dispersion coefficient vd9 of the ninth lens E9 satisfy: 1.77 < nd9 < 1.85, vd9 < 44; the refractive index nd12 and the dispersion coefficient vd12 of the twelfth lens E12 satisfy: nd12 > 1.80, vd12 < 35; the refractive index nd13 and the dispersion coefficient vd13 of the thirteenth lens E13 of the optical lens satisfy: 1.50 < nd13 < 1.65, 58 < vd13 < 66. The focal length f of the large-range zoom lens is 6.25 mm.

[0034] The focal length f = 6.25 mm, FNO = 1.9, the total lens length TTL = 90 mm, and the full field of view image height is 6.9 mm for the large-range zoom lens. The parameters of the large-range zoom lens are listed in Table 1 and Table 2 in turn: where Surf is the surface number, Type is the surface type, Radius is the radius of curvature, Thickness is the lens thickness, Index is the refractive index, ABB is the dispersion coefficient, and EFL-E is the focal length.

[0035] Table 1

[0036]

[0037]

[0038]

[0039] Surf1 and Surf2 correspond to the two surfaces of the first lens E1, Surf3 and Surf4 correspond to the two surfaces of the second lens E2, Surf5 and Surf6 correspond to the two surfaces of the third lens E3, Surf7 and Surf8 correspond to the two surfaces of the fourth lens E4, Surf9 and Surf10 correspond to the two surfaces of the fifth lens E5, Surf12 and Surf13 correspond to the two surfaces of the sixth lens E6, Surf14 and Surf15 correspond to the two surfaces of the seventh lens E7, Surf16 and Surf17 correspond to the two surfaces of the eighth lens E8, Surf18 and Surf19 correspond to the two surfaces of the ninth lens E9, Surf20 and Surf21 correspond to the two surfaces of the tenth lens E10, SurfSTO is the surface of the aperture device STO, Surf22 and Surf23 correspond to the two surfaces of the eleventh lens E11, Surf24 and Surf25 correspond to the two surfaces of the twelfth lens E12, Surf26 and Surf27 correspond to the two surfaces of the thirteenth lens E13, Surf28 and Surf29 correspond to the two surfaces of the fourteenth lens E14, and Surf30 is the surface of the protective glass B.

[0040] The relevant focal length values ​​of the lens group are listed in Table 2:

[0041] Lens Group focal length G1 59.37901299 G2 -12.21674309 G3 28.12469375 G4 34.00955612 G5 71.25393358

[0042] Table 2

[0043] In the above table of the embodiment of the present patent, Index is the refractive index, Radius is the radius of curvature, and from Table 1 and Table 2, it can be obtained that: f1 = -73.14, f5 / f4 = 1.31, f7 / f9 = -2.04, f11 = 14.26, f13 / f14 = -1.43, f(G1) = 59.38, f(G2) = -12.22, f(G3) = 28.12, f(G5) / f(G4) = 2.10, nd1 = 1.75, vd1 = 35.0, nd2 = 1 .50, vd2=81.6, nd4=1.74, vd4=44.9, nd6=2.00, vd6=25.4, nd7=1.59, vd7=68.6, nd9=1.80, vd9=34.9, nd12=1.92, vd12=20.9, nd13=1.59, vd13=61.2, all meet the requirements; the zoom lens provided by the embodiment is to provide a zoom, variable aperture, low distortion, and high resolution characteristics to meet the needs of the market. The function of changing the focal length is achieved by adjusting the moving position of the lens group 2 (G2), the moving position of the lens group (G4) is adjusted to compensate for the focus to obtain a clear picture, the size of the aperture is changed by adjusting the size of the diaphragm (STO) to adjust the brightness of the picture, and the distortion of the zoom lens is effectively reduced by reasonably using each lens and limiting the focal length of each lens, thereby improving the effect of photography.

[0044] Figure 2 The implemented MTF (Modulation Transfer Function) analysis diagram is based on the parameters in Table 1. The measurement of the quality of optical lenses, such as resolution, is the most important. The definition of MTF value must be greater than 0 and less than 1. In this technical field, the closer the MTF value is to 1, the better the performance of the lens, that is, the higher the resolution; its variable is spatial frequency, which is measured by the number of lines that can be presented within a mm range, and its unit is lp / mm; the higher this curve is, the higher the lens resolution is, and the ordinate is the MTF value. The horizontal axis can be set as the distance from the center of the image field to the measurement point. The lens is a symmetrical structure centered on the optical axis. The law of image quality change from the center to all directions is the same. Due to the influence of factors such as aberrations, the farther the distance between a point in the image field and the center of the image field is, the MTF value generally shows a downward trend. Therefore, the distance from the center of the image field to the edge of the image field is used as the horizontal axis to reflect the image quality of the edge of the lens.

[0045] In addition, at a position deviated from the center of the image field, the MTF values ​​measured by the sinusoidal grating along the tangential direction and along the radial direction are different. The MTF curve generated by the lines parallel to the diameter is called the sagittal curve, marked as S (Sagittal), and the MTF curve generated by the lines parallel to the tangent is called the meridional curve, marked as T (Meridional). In this way, there are generally two MTF curves, namely the S curve and the T curve. Figure 2 There are multiple groups of MTF curves from the center of the image field to the edge of the image field, which reflect that this lens system has a higher resolution and its optical performance is greatly improved compared with the current mainstream optical system. Figure 4 There are multiple sets of MTF curves from the center of the image field to the edge of the image field, reflecting that the system has a high resolution.

[0046] Figure 3 This is the point diagram corresponding to the optical lens. Its centroid radius and geometric radius are shown in the figure, which can achieve good imaging quality.

[0047] The smaller the meridian field curvature and sagittal field curvature values ​​are, the better the imaging quality is. Figure 4 As shown, when the lens focal length f is 6.25mm, the meridian field curvature value and the sagittal field curvature value are both controlled within the range of -0.05 to 0.05mm.

[0048] Similarly, the smaller the distortion value of the lens, the better the imaging quality of the lens. Figure 5 The focal length of the lens is 6.25mm and the distortion diagram shows that the optical distortion value is controlled within the range of -7%. Figure 6 is a defocus curve diagram of the zoom lens with a focal length f of 6.25 mm according to Example 1 of the present invention. Figure 6 It can be seen that the distortion of the zoom lens is effectively reduced and the resolution is high.

[0049] In summary, a wide-range zoom lens of the present invention adopts five lens groups. The function of changing the focal length is achieved by adjusting the moving position of the lens group G2, and the moving position of the lens group G4 is adjusted to compensate for the focus to obtain a clear picture. The size of the aperture is changed by adjusting the size of the diaphragm STO to adjust the brightness of the picture. By reasonably using each lens and limiting the optical focal length of each lens, the distortion of the zoom lens is effectively reduced and the camera effect is improved. At the same time, the lenses used have good acid and alkali resistance and high and low temperature resistance, and can be adapted to harsh environments. The zoom lens of this patent takes into account the characteristics of zoom, variable aperture, low distortion, and high resolution to meet market demand.

[0050] Embodiment 2:

[0051] like Figure 7As shown in the figure, a wide-range zoom lens includes: a first lens E1 with a negative focal length, a second lens E2 with a positive focal length, a third lens E3 with a positive focal length, a fourth lens E4 with a negative focal length, a fifth lens E5 with a negative focal length, a sixth lens E6 with a positive focal length, a diaphragm STO, a seventh lens E7 with a positive focal length, an eighth lens E8 with a positive focal length, a ninth lens E9 with a negative focal length, a tenth lens E10 with a positive focal length, an eleventh lens E11 with a positive focal length, a twelfth lens E12 with a negative focal length, a thirteenth lens E13 with a negative focal length, a fourteenth lens E14 with a positive focal length, and a protective glass B, which are arranged in sequence from the object side to the image side along the optical axis. The first lens E1, the second lens E2, and the third lens E3 form a first lens group G1, the fourth lens E4, the fifth lens E5, and the sixth lens E6 form a second lens group G2, the diaphragm STO, the seventh lens E7, the eighth lens E8, and the ninth lens E9 form a third lens group G3, the tenth lens E10, the eleventh lens E11, and the twelfth lens E12 form a fourth lens group G4, and the thirteenth lens E13 and the fourteenth lens E14 form a fifth lens group G5.

[0052] As Figure 7 shown in the figure, the first lens E1, the second lens E2, the fifth lens E5, the sixth lens E6, the eighth lens E8, the ninth lens E9, the eleventh lens E11, and the twelfth lens E12 are all cemented doublets. The object-side surfaces of the first lens E1, the second lens E2, and the third lens E3 are all convex lenses. The range of the focal length f1 of the first lens E1 is -85.2 < f1 < -61.2. The range of the ratio of the focal length f5 of the fifth lens E5 to the focal length f4 of the fourth lens E4 is 0.75 < f5 / f4 < 1.88. The range of the ratio of the focal length f7 of the seventh lens E7 to the focal length f9 of the ninth lens E9 is -3.15 < f7 / f9 < -1.17. The range of the focal length f11 of the eleventh lens E11 is 12.8 < f11 < 16.4. The range of the ratio of the focal length f13 of the thirteenth lens E13 to the focal length f14 of the fourteenth lens E14 is -2.15 < f13 / f14 < -0.67.

[0053] As Figure 7As shown, the focal length f(G1) of the first lens group G1 ranges from 50.6 < f(G1) < 65.9, the focal length f(G2) of the second lens group G2 ranges from -23.4 < f(G2) < -8.6, the focal length f(G3) of the third lens group G3 ranges from 13.8 < f(G3) < 35.9, and the range of the ratio of the focal length f(G5) of the fourth lens group G4 to the focal length f(G5) of the fifth lens group G5 is: 1.49 < f(G5) / f(G4) < 3.07. The refractive index nd1 and the dispersion coefficient vd1 of the first lens E1 satisfy: 1.56 < nd1 < 1.81, 25 < vd1 < 48; the refractive index nd2 and the dispersion coefficient vd2 of the second lens E2 satisfy: nd2 < 1.55, vd2 > 60; the refractive index nd4 and the dispersion coefficient vd4 of the fourth lens E4 satisfy: 1.56 < nd4 < 1.81, 37 < vd4 < 56, and the refractive index nd6 and the dispersion coefficient vd6 of the sixth lens E6 satisfy: nd6 > 1.95, vd6 < 34; the refractive index nd7 and the dispersion coefficient vd7 of the seventh lens E7 satisfy: 1.45 < nd7 < 1.66, 57 < vd7 < 75; the refractive index nd9 and the dispersion coefficient vd9 of the ninth lens E9 satisfy: 1.77 < nd9 < 1.85, vd9 < 44; the refractive index nd12 and the dispersion coefficient vd12 of the twelfth lens E12 satisfy: nd12 > 1.80, vd12 < 35; the refractive index nd13 and the dispersion coefficient vd13 of the thirteenth lens E13 of the optical lens satisfy: 1.50 < nd13 < 1.65, 58 < vd13 < 66. The focal length f of the large-range zoom lens is 52.5 mm.

[0054] Fig. 9 is the spot diagram corresponding to the optical lens, and its centroid radius and geometric radius are as Fig. 9 shown, and good imaging quality can be achieved. Fig.11 In the lens with the focal length f of 52.5 mm in [], the distortion diagram shows that the optical distortion value is controlled within the range of 5%. Figure 8 This is the MTF analysis diagram of the zoom lens with the focal length f of 52.5 mm in Embodiment 2 of the present invention. From Figure 8 it can be seen that the present invention has a high resolution, and the optical performance is greatly improved compared with the current mainstream optical systems; as Fig.10 shown, when the lens focal length f is 52.5 mm, both the meridional field curvature value and the sagittal field curvature value are controlled within the range of -0.05 to 0.05 mm. From Fig.12 it can be seen that the distortion of the zoom lens is effectively reduced and the resolution is high.

[0055] The present invention achieves the function of changing the focal length by adjusting the moving position of the second lens group, adjusts the moving position of the fourth lens group to compensate for the focus to obtain a clear picture, changes the size of the aperture by adjusting the size of the diaphragm, and thus adjusts the brightness of the picture. By reasonably using each lens and limiting the optical focal length of each lens, the distortion of the zoom lens is effectively reduced and the video recording effect is improved. The zoom lens of this patent takes into account the characteristics of zoom, variable aperture, low distortion, and high resolution to meet market demand.

[0056] It should be noted that the above is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiment, and there may be many variations, such as the focal length f of the wide-range zoom lens is any value between 6.25≤f≤52.5. In short, all variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A wide-range zoom lens, characterized in that The large-range zoom lens has fourteen lenses with focal lengths, including: a first lens (E1) with a negative focal length, a second lens (E2) with a positive focal length, a third lens (E3) with a positive focal length, a fourth lens (E4) with a negative focal length, a fifth lens (E5) with a negative focal length, a sixth lens (E6) with a positive focal length, a diaphragm (STO), a seventh lens (E7) with a positive focal length, an eighth lens (E8) with a positive focal length, a ninth lens (E9) with a negative focal length, a tenth lens (E10) with a positive focal length, an eleventh lens (E11) with a positive focal length, a twelfth lens (E12) with a negative focal length, a thirteenth lens (E13) with a negative focal length, a fourteenth lens (E14) with a positive focal length, and a protective glass (B), which are arranged in order from the object side to the image side along the optical axis. The first lens (E1), the second lens (E2), and the third lens (E3) form a first lens group (G1), the fourth lens (E4), the fifth lens (E5), and the sixth lens (E6) form a second lens group (G2), the diaphragm (STO), the seventh lens (E7), the eighth lens (E8), and the ninth lens (E9) form a third lens group (G3), the tenth lens (E10), the eleventh lens (E11), and the twelfth lens (E12) form a fourth lens group (G4), and the thirteenth lens (E13) and the fourteenth lens (E14) form a fifth lens group (G5). The focal lengths of the fourth lens group (G4) and the fifth lens group (G5) are both positive values; The range of the focal length f(G1) of the first lens group (G1) is 50.6 mm < f(G1) < 65.9 mm, the range of the focal length f(G2) of the second lens group (G2) is -23.4 mm < f(G2) < -8.6 mm, the range of the focal length f(G3) of the third lens group (G3) is 13.8 mm < f(G3) < 35.9 mm, and the range of the ratio of the focal length f(G5) of the fifth lens group (G5) to the focal length f(G4) of the fourth lens group (G4) is: 1.49 < f(G5) / f(G4) < 3.07; The lens achieves the function of changing the focal length by adjusting the moving position of the second lens group, and adjusts the moving position of the fourth lens group to compensate for focusing to obtain a clear image.

2. The wide-range zoom lens according to claim 1, characterized in that: The first lens (E1), the second lens (E2), the fifth lens (E5), the sixth lens (E6), the eighth lens (E8), the ninth lens (E9), the eleventh lens (E11), and the twelfth lens (E12) are all cemented lens combinations.

3. The wide-range zoom lens according to claim 1, characterized in that: The object-side surfaces of the first lens (E1), the second lens (E2), and the third lens (E3) are all convex lenses.

4. The wide-range zoom lens according to claim 1, characterized in that: The range of the focal length f1 of the first lens (E1) is -85.2 mm < f1 < -61.2 mm, and the range of the ratio of the focal length f5 of the fifth lens (E5) to the focal length f4 of the fourth lens (E4) is 0.75 < f5 / f4 < 1.

88.

5. The wide-range zoom lens according to claim 1, characterized in that: The range of the ratio of the focal length f7 of the seventh lens (E7) to the focal length f9 of the ninth lens (E9) is -3.15 < f7 / f9 < -1.

17. The range of the focal length f11 of the eleventh lens (E11) is 12.8 mm < f11 < 16.4 mm. The range of the ratio of the focal length f13 of the thirteenth lens (E13) to the focal length f14 of the fourteenth lens (E14) is -2.15 < f13 / f14 < -0.

67.

6. The wide-range zoom lens according to claim 1, characterized in that: The refractive index nd1 and the dispersion coefficient vd1 of the first lens (E1) satisfy: 1.56 < nd1 < 1.81, 25 < vd1 < 48. The refractive index nd2 and the dispersion coefficient vd2 of the second lens (E2) satisfy: nd2 < 1.55, vd2 > 60. The refractive index nd4 and the dispersion coefficient vd4 of the fourth lens (E4) satisfy: 1.56 < nd4 < 1.81, 37 < vd4 < 56.

7. The wide-range zoom lens according to claim 1, characterized in that: The refractive index nd6 and the dispersion coefficient vd6 of the sixth lens (E6) satisfy: nd6 > 1.95, vd6 < 34. The refractive index nd7 and the dispersion coefficient vd7 of the seventh lens (E7) satisfy: 1.45 < nd7 < 1.66, 57 < vd7 < 75. The refractive index nd9 and the dispersion coefficient vd9 of the ninth lens (E9) satisfy: 1.77 < nd9 < 1.85, vd9 < 44. The refractive index nd12 and the dispersion coefficient vd12 of the twelfth lens (E12) satisfy: nd12 > 1.80, vd12 < 35. The refractive index nd13 and the dispersion coefficient vd13 of the thirteenth lens (E13) satisfy: 1.50 < nd13 < 1.65, 58 < vd13 < 66.

8. The wide-range zoom lens according to claim 1, characterized in that: The focal length f of the large-range zoom lens satisfies: 6.25 mm ≤ f ≤ 52.5 mm.

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