Zoom lens and imaging apparatus

Abstract

The application discloses a zoom lens and an imaging device, wherein an optical axis is formed in the zoom lens, the zoom lens has an object side and an image side which are oppositely arranged along the direction of the optical axis, the zoom lens comprises a lens barrel and a plurality of lens groups, the plurality of lens groups sequentially comprise a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group from the object side to the image side, the first lens group has positive refractive power, the first lens group is fixedly installed on the lens barrel, the second lens group has negative refractive power, the second lens group is movably installed on the lens barrel along the direction of the optical axis, the third lens group has positive refractive power, the third lens group is fixedly installed on the lens barrel, the fourth lens group has positive refractive power, the fourth lens group is movably installed on the lens barrel along the direction of the optical axis, and the fifth lens group has positive refractive power, and the fifth lens group is fixedly installed on the lens barrel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical system imaging technology, in particular to a zoom lens and an imaging device. BACKGROUND

[0002] At present, the mainstream high image quality monitoring system zoom lens on the market generally adopts multiple glass aspherical lenses to improve the resolution of the lens, but the manufacturing cost is high. At present, the monitoring system zoom lens starts to develop towards the direction of family and low cost, so the monitoring lens with high manufacturing cost cannot meet the market demand. SUMMARY

[0003] The main purpose of the present application is to provide a zoom lens and an imaging device, which aims to solve the problem of high manufacturing cost of the existing zoom lens.

[0004] In order to achieve the above purpose, the present application provides a zoom lens, an optical axis is formed in the zoom lens, the zoom lens has an object side and an image side which are oppositely arranged along the optical axis direction, and the zoom lens comprises a lens barrel and a plurality of lens groups, the plurality of lens groups comprise:

[0005] A first lens group with positive refractive power, the first lens group is fixedly installed on the lens barrel;

[0006] A second lens group with negative refractive power, the second lens group is movably installed on the lens barrel along the optical axis direction;

[0007] A third lens group with positive refractive power, the third lens group is fixedly installed on the lens barrel;

[0008] A fourth lens group with positive refractive power, the fourth lens group is movably installed on the lens barrel along the optical axis direction; and

[0009] A fifth lens group with positive refractive power, the fifth lens group is fixedly installed on the lens barrel;

[0010] Under the action of external force, the second lens group moves towards the image side, so that the zoom lens zooms from the wide-angle end to the telephoto end, and at the same time, the fourth lens group moves along the optical axis direction to focus the zoom lens;

[0011] Wherein, the focal length of the zoom lens 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, and the focal length of the fifth lens group is f5. When the zoom lens is at the wide-angle end, in the zoom lens:

[0012] 0.103 < fw / f1 < 0.14; and / or,

[0013] -0.758 < fw / f2 < -0.561; and / or,

[0014] 0.199 < fw / f3 < 0.269; and / or,

[0015] 0.148 < fw / f4 < 0.2; and / or,

[0016] 0.136 < fw / f5 < 0.184.

[0017] Optionally, the first lens group comprises, in order from the object side to the image side:

[0018] a first lens having negative refractive power;

[0019] a second lens having positive refractive power;

[0020] a third lens having positive refractive power; and,

[0021] a fourth lens having positive refractive power;

[0022] wherein a focal length of the first lens is f11, a focal length of the second lens is f12, a focal length of the third lens is f13, and a focal length of the fourth lens is f14, and within the first lens group:

[0023] -0.441 < f1 / f11 < -0.294; and / or,

[0024] 0.349 < f1 / f12 < 0.523; and / or,

[0025] 0.3 < f1 / f13 < 0.451; and / or,

[0026] 0.506 < f1 / f14 < 0.758.

[0027] Optionally, the second lens group comprises, in order from the object side to the image side:

[0028] a fifth lens having negative refractive power;

[0029] a sixth lens having negative refractive power; and,

[0030] a seventh lens having positive refractive power;

[0031] wherein a focal length of the fifth lens is f21, a focal length of the sixth lens is f22, and a focal length of the seventh lens is f23, and within the second lens group:

[0032] 0.759 < f2 / f21 < 1.138; and / or,

[0033] 0.553 < f2 / f22 < 0.83; and / or,

[0034] -0.629 < f2 / f23 < -0.42.

[0035] Optionally, the third lens group comprises, in order from the object side to the image side:

[0036] an eighth lens having positive refractive power;

[0037] a ninth lens having positive refractive power; and,

[0038] a tenth lens having negative refractive power;

[0039] wherein a focal length of the eighth lens is f31, a focal length of the ninth lens is f32, and a focal length of the tenth lens is f33, within the third lens group:

[0040] 0.595 < f3 / f31 < 0.892; and / or,

[0041] 0.889 < f3 / f32 < 1.334; and / or,

[0042] -1.194 < f3 / f33 < -0.796.

[0043] Optionally, the fourth lens group comprises, in order from the object side to the image side:

[0044] an eleventh lens having positive refractive power; and,

[0045] a twelfth lens having negative refractive power;

[0046] wherein a focal length of the eleventh lens is f41, and a focal length of the twelfth lens is f42, within the fourth lens group:

[0047] 1.669 < f4 / f41 < 2.258; and / or,

[0048] -1.682 < f4 / f42 < -1.243.

[0049] Optionally, the first lens, the second lens, the third lens, and the fourth lens are all glass spherical lenses; and / or,

[0050] the fifth lens is a glass spherical lens, the sixth lens and the seventh lens are plastic aspherical lenses; and / or,

[0051] the eighth lens is a glass spherical lens, the ninth lens and the tenth lens are plastic aspherical lenses; and / or,

[0052] The eleventh lens is a glass spherical lens, and the twelfth lens is a plastic aspherical lens; and / or,

[0053] The fifth lens group includes a thirteenth lens, and the thirteenth lens is a plastic aspherical positive lens.

[0054] Optionally, the effective clear aperture of the first lens is The total optical length of the zoom lens is TTL. In the zoom lens:

[0055] Optionally, the relative displacement of the fourth lens when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position is ΔZ W-T , the total optical length of the zoom lens is TTL, in the zoom lens: 0.255<ΔZ W-T / TTL<0.331.

[0056] Optionally, the zoom lens further includes a diaphragm, and the diaphragm is located between the second lens group and the third lens group;

[0057] The distance from the aperture to the imaging surface of the zoom lens on the optical axis is L, the total optical length of the zoom lens is TTL, and within the zoom lens: 0.327 <L / TTL<0.442。

[0058] In addition, the present invention also provides an imaging device, which includes the above-mentioned zoom lens.

[0059] In the technical solution of the present invention, in the lens barrel, a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group are arranged in sequence from the object side to the image side, and the optical powers of the five lens groups are positive, negative, positive, positive, and positive, respectively, and the second lens group and the fourth lens group can move along the optical axis in the lens barrel. The second lens group moves toward the image side to enable the zoom lens to zoom from the wide-angle end to the telephoto end, and at the same time, the fourth lens group moves along the optical axis to enable the zoom lens to focus. In this way, by optimizing the positive and negative focal lengths of each lens group, the aberrations of the zoom lens are effectively corrected, and by adjusting the positions of the second lens group and the fourth lens group, the image of the zoom lens remains clear during the zooming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without any creative effort.

[0061] Figure 1 Structure schematic diagram of the zoom lens in the wide-angle end in the present application;

[0062] Figure 2 Structure schematic diagram of the zoom lens in the intermediate magnification in the present application; Figure 1

[0063] Figure 3 Structure schematic diagram of the zoom lens in the telephoto end in the present application; Figure 1

[0064] Figure 4 Spherical aberration diagram of the zoom lens in the wide-angle end in the present application; Figure 1

[0065] Figure 5 Curvature of field diagram of the zoom lens in the wide-angle end in the present application; Figure 1

[0066] Figure 6 Distortion diagram of the zoom lens in the wide-angle end in the present application; Figure 1

[0067] Figure 7 Spherical aberration diagram of the zoom lens in the intermediate magnification in the present application; Figure 1

[0068] Figure 8 Curvature of field diagram of the zoom lens in the intermediate magnification in the present application; Figure 1

[0069] Figure 9 Distortion diagram of the zoom lens in the intermediate magnification in the present application; Figure 1

[0070] Figure 10 Spherical aberration diagram of the zoom lens in the telephoto end in the present application; Figure 1

[0071] Figure 11 Curvature of field diagram of the zoom lens in the telephoto end in the present application; Figure 1

[0072] Figure 12 Distortion diagram of the zoom lens in the telephoto end in the present application. Figure 1 ​​​​​​​​​​​

[0073] BRIEF DESCRIPTION OF DRAWINGS

[0074] Reference Name Reference Name 100 Zoom lens 32 Ninth lens 1 First lens group 33 Tenth lens 11 First lens 4 Fourth lens group 12 Second lens 41 Eleventh lens 13 Third lens 42 Twelfth lens 14 Fourth lens 5 Fifth lens group 2 Second lens group 51 Thirteenth lens 21 Fifth lens 6 Imaging element 22 Sixth lens 61 Image plane 23 Seventh lens 7 Diaphragm 3 Third lens group 8 Filter 31 Eighth lens

[0075] The objectives, features and advantages of the present application will be further illustrated with reference to the following embodiments and accompanying drawings. DETAILED DESCRIPTION

[0076] The technical solutions in the embodiments of the present application will be apparently and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise that the embodiments in the present application fall within the scope of protection of the present application.

[0077] It should be noted that if the embodiments of the present application involve directional indications, the directional indications are only used to explain the relative position relationship, movement condition and the like between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0078] In addition, if the embodiments of the present application involve descriptions of “first”, “second” and the like, the descriptions of “first”, “second” and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is also not within the scope of protection claimed by the present application.

[0079] The present application provides an imaging device, which can be a monitoring camera, a video camera and the like, and the imaging device comprises a zoom lens, and aims to solve the problem of high manufacturing cost of the existing zoom lens. Wherein, Figures 1 to 12 The schematic diagram of the zoom lens provided by the present application.

[0080] Please refer to Figures 1 to 3An optical axis is formed in the zoom lens 100, the zoom lens 100 has an object side and an image side opposite to each other along the optical axis direction, the zoom lens 100 comprises a lens barrel (not shown in the figure) and a plurality of lens groups, the plurality of lens groups comprise, in sequence from the object side to the image side, a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4 and a fifth lens group 5, the first lens group 1 has positive refractive power, the first lens group 1 is fixedly installed on the lens barrel, the second lens group 2 has negative refractive power, the second lens group 2 is movably installed on the lens barrel along the optical axis direction, the third lens group 3 has positive refractive power, the third lens group 3 is fixedly installed on the lens barrel, the fourth lens group 4 has positive refractive power, the fourth lens group 4 is movably installed on the lens barrel along the optical axis direction, the fifth lens group 5 has positive refractive power, and the fifth lens group 5 is fixedly installed on the lens barrel, wherein under the action of an external force, the second lens group 2 moves towards the image side to make the zoom lens 100 zoom from a wide-angle end to a telephoto end, and at the same time the fourth lens group 4 moves along the optical axis direction to make the zoom lens 100 focus.

[0081] Specifically, when the zoom lens 100 is at the wide-angle end, the focal length 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, and the focal length of the fifth lens group 5 is f5, and in the zoom lens: 0.103<fw / f1<0.14, -0.758<fw / f2<-0.561, 0.199<fw / f3<0.269, 0.148<fw / f4<0.2, and 0.136<fw / f5<0.184. Through reasonable setting of the five lens groups and conditional limitation of the wide-angle end focal length of the zoom lens 100 and the focal length ratio of each lens group, the zoom lens 100 has the effects of wide angle and small distortion.

[0082] It should be noted that the refractive power is equal to the difference between the convergence degree of the image side beam and the convergence degree of the object side beam, which represents the ability of the optical system to deflect light. The greater the absolute value of the refractive power, the stronger the bending ability of the light, and the smaller the absolute value of the refractive power, the weaker the bending ability of the light. When the refractive power is positive, the refraction of the light is convergent; when the refractive power is negative, the refraction of the light is divergent. The refractive power can be used to represent a certain refractive surface of a lens (i.e. a surface of the lens), to represent a certain lens, or to represent a system (i.e. a lens group) formed by a plurality of lenses.

[0083] It should be understood that the driving mode of the second lens group 2 and / or the fourth lens group 4 can be various, which can be driven by a driving motor or manually adjusted, and the present application does not limit this.

[0084] In the embodiment, the first lens group 1 comprises, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14, the first lens 11 is a convex-concave negative lens, the convex surface of which faces the object side, the second lens 12 is a convex-concave positive lens, the convex surface of which faces the object side, the third lens 13 is a convex-concave positive lens, the convex surface of which faces the object side, and the fourth lens 14 is a convex-concave positive lens, the convex surface of which faces the object side, wherein 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, and in the first lens group 1: -0.441 < f1 / f11 < -0.294, 0.349 < f1 / f12 < 0.523, 0.3 < f1 / f13 < 0.451, 0.506 < f1 / f14 < 0.758, by optimizing the positive and negative focal lengths of the lenses in the first lens group 1, the aberration of the zoom lens 100 is effectively corrected, which helps to improve the imaging quality of the zoom lens 100.

[0085] Further, the first lens 11 and the second lens 12 are connected by cementing, which helps to reduce the distance between the first lens 11 and the second lens 12, is conducive to reducing the volume of the zoom lens 100, and helps to improve the light transmittance of the first lens group 1.

[0086] It should be noted that in the first lens group 1, the refractive index of the first lens 11 is Nd11, and the Abbe number of the first lens 11 is Vd11, wherein 1.7 < Nd11 < 2.1, and 10 < Vd11 < 40; the refractive index of the second lens 12 is Nd12, and the Abbe number of the second lens 12 is Vd12, wherein 1.4 < Nd12 < 1.7, and 60 < Vd12 < 100; the refractive index of the third lens 13 is Nd13, and the Abbe number of the third lens 13 is Vd13, wherein 1.4 < Nd13 < 1.7, and 60 < Vd13 < 100; the refractive index of the fourth lens 14 is Nd14, and the Abbe number of the fourth lens 14 is Vd14, wherein 1.4 < Nd14 < 1.7, and 60 < Vd14 < 100.

[0087] In the embodiment, the second lens group 2 comprises, in order from the object side to the image side, a fifth lens 21, a sixth lens 22 and a seventh lens 23, the fifth lens 21 is a convex-concave negative lens, the convex surface of which faces the object side, the sixth lens 22 is a double-concave negative lens, and the seventh lens 23 is a double-convex positive lens, wherein 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, and in the second lens group 2: 0.759 < f2 / f21 < 1.138, 0.553 < f2 / f22 < 0.83, and -0.629 < f2 / f23 < -0.42. By optimizing the positive and negative focal lengths of the lenses in the second lens group 2, the aberration of the zoom lens 100 is effectively corrected, which helps to improve the imaging quality of the zoom lens 100.

[0088] Further, in the second lens group 2, the refractive index of the fifth lens 21 is Nd21, and the Abbe number of the fifth lens 21 is Vd21, wherein 1.75 < Nd21 < 2.1, and 15 < Vd21 < 45.

[0089] In the embodiment, the third lens group 3 comprises, in order from the object side to the image side, an eighth lens 31, a ninth lens 32 and a tenth lens 33, the eighth lens 31 is a double-convex positive lens, the ninth lens 32 is a double-concave positive lens, and the tenth lens 33 is a convex-concave negative lens, the convex surface of which faces the object side, wherein the focal length of the eighth lens 31 is f31, the focal length of the ninth lens 32 is f32, and the focal length of the tenth lens 33 is f33, and in the third lens group 3: 0.595 < f3 / f31 < 0.892, 0.889 < f3 / f32 < 1.334, and -1.194 < f3 / f33 < -0.796. By optimizing the positive and negative focal lengths of the lenses in the third lens group 3, the aberration of the zoom lens 100 is effectively corrected, which helps to improve the imaging quality of the zoom lens 100.

[0090] In the embodiment, the fourth lens group 4 comprises, in order from the object side to the image side, an eleventh lens 41 and a twelfth lens 42, the eleventh lens 41 is a double-convex spherical positive lens, and the twelfth lens 42 is a non-spherical negative lens, wherein the focal length of the eleventh lens 41 is f41, the focal length of the twelfth lens 42 is f42, and in the fourth lens group 4: 1.669 < f4 / f41 < 2.258, and -1.682 < f4 / f42 < -1.243. By optimizing the positive and negative focal lengths of the lenses in the fourth lens group 4, the aberration of the zoom lens 100 is effectively corrected, which helps to improve the imaging quality of the zoom lens 100.

[0091] Further, in the fourth lens group 4, the refractive index of the eleventh lens 41 is Nd41, and the Abbe number of the eleventh lens 41 is Vd41, where 1.4 < Nd41 < 1.7, and 60 < Vd41 < 100, the refractive index of the twelfth lens 42 is Nd42, and the Abbe number of the twelfth lens 42 is Vd42, where 1.4 < Nd42 < 1.7, and 15 < Vd42 < 30.

[0092] In order to improve the imaging quality of the zoom lens 100, in the embodiment, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are all glass spherical lenses. Since the glass lens has good light transmittance and is not easily affected by temperature, the first lens group 1 uses glass lenses, which helps to improve the light transmittance of the first lens group 1 and prevent the zoom lens 100 from causing resolution deterioration due to environmental temperature changes.

[0093] In order to reduce the cost of the zoom lens 100, in the embodiment, the fifth lens 21 is a glass spherical lens, the sixth lens 22 and the seventh lens 23 are plastic aspherical lenses. The eighth lens 31 is a glass spherical lens, the ninth lens 32 and the tenth lens 33 are plastic aspherical lenses. The eleventh lens 41 is a glass spherical lens, and the twelfth lens 42 is a plastic aspherical lens. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens, which is different from the spherical lens with constant curvature from the center of the lens to the periphery of the lens. The aspherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration, and can eliminate aberration as much as possible during imaging, thereby improving the imaging quality of the lens. The lens made of glass material can reduce the influence of temperature on the optical performance of the lens, and the lens made of plastic material can reduce the mass and cost of the zoom lens 100. Therefore, the second lens group 2, the third lens group 3, and the fourth lens group 4 use glass lenses and plastic lenses in combination to reduce the cost of the zoom lens 100 while ensuring the imaging quality of the zoom lens 100.

[0094] In the embodiment, the fifth lens group 5 includes a thirteenth lens 51, which is a plastic aspherical positive lens. The use of plastic aspherical lenses helps to eliminate aberration during imaging, improves imaging quality, reduces the mass and cost of the zoom lens 100, and is not limited to the thirteenth lens 51.

[0095] In this embodiment, the zoom lens 100 further includes an imaging element 6, which is located on the image side of the fifth lens group 5. The imaging element 6 has an image surface 61 facing the fifth lens group 5. The imaging element 6 is used to receive light signals emitted from the outside through the multiple lens groups through the image surface 61.

[0096] Specifically, the image plane 61 can be understood as the surface of an image sensor, that is, it can be the surface of an imaging element 6 such as a CCD or CMOS. More specifically, in this embodiment, the image plane 61 is the surface of a CMOS solid-state imaging element 6 (the size of the CMOS in this embodiment is 1 / 2.8" inch H*V=5.57mm*3.13mm). It can be understood that light carrying information about the object can pass through the first lens group 1, the second lens group 2, the aperture 7, the third lens group 3, the fourth lens group 4, and the fifth lens group 5 in sequence, and finally form an image on the image plane 61.

[0097] In this embodiment, the zoom lens 100 further includes an aperture 7 disposed on the optical axis and located between the second lens group 2 and the third lens group 3. The aperture size of the aperture 7 is adjustable. The aperture 7 can be adjusted accordingly according to changes in ambient light intensity to adjust the light entering the zoom lens 100, thereby further improving the imaging quality of the zoom lens 100.

[0098] Furthermore, the zoom lens 100 satisfies the following conditions: 0.327 <L / TTL<0.442;其中,L为所述光阑7到所述像面61在所述光轴上的距离,TTL为所述变焦镜头100的光学总长,需要说明的是,所述光学总长即为所述第一透镜11的物侧面中心顶点到所述成像面61的距离。

[0099] Specifically, in this embodiment, the zoom lens 100 further includes a filter 8 , which is located between the fifth lens group 5 and the image plane 61 . The filter 8 is used to filter out light of unnecessary wavelengths and stray light, thereby improving imaging quality.

[0100] In this embodiment, the zoom lens 100 meets the following conditions: in, is the effective clear aperture of the first lens 11 , and TTL is the total optical length of the zoom lens 100 .

[0101] In this embodiment, the zoom lens 100 satisfies the following conditions: 0.255<ΔZ W-T / TTL<0.331; where ΔZ W-TTTL is the total track length of the zoom lens 100.

[0102] Specifically, in the present embodiment, the parameters of the zoom lens 100 are as follows:

[0103] Wide-angle end focal length fw = 4.32 mm, telephoto end focal length ft = 40.91 mm; wide-angle end aperture number Fno w = 1.76, telephoto end aperture number Fno T = 3; wide-angle end horizontal field of view FOVH w = 68.26°, telephoto end horizontal field of view FOVH T = 7.75°; optical distortion range is between -5% and 5%; total track length TTL of the zoom lens 100 = 68 mm.

[0104] Specifically, in the present embodiment, the parameters of the zoom lens 100 are as follows:

[0105] Table 1 Parameters of each lens of the imaging lens

[0106]

[0107]

[0108] S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S28, R, D, Nd, Vd.

[0109] Specifically, the surface shape z of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0110]

[0111] wherein c is the curvature corresponding to the radius, y is the radial coordinate (which has the same unit as 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, and when the k coefficient is greater than 0, it is a flat circle), A, B, C, D, E, F are high-order aspheric coefficients, and the high-order coefficients of each aspheric mirror can be known from Table 2 below.

[0112] Table 2: Even-order coefficients of aspheric lenses of the zoom lens 100

[0113] Surface number R K A B C D E F S10 -9.64 0.39 1.1E-03 -5.5E-05 1.0E-06 -5.0E-09 -8.8E-11 -4.8E-12 S11 13.04 -13.03 2.9E-04 3.2E-05 -3.7E-06 1.2E-07 -2.1E-09 1.8E-11 S12 13.3 -5.93 -6.9E-04 6.9E-05 -3.0E-06 5.6E-08 -3.4E-10 -1.9E-14 S13 -22.85 7.92 -8.2E-05 -4.7E-06 5.0E-07 -6.5E-09 1.6E-11 -1.8E-14 S17 10.59 0.26 -3.1E-04 6.9E-06 2.0E-08 -1.1E-08 2.3E-10 -3.0E-14 S18 -89.35 71.26 -1.8E-04 3.2E-05 -1.3E-06 1.1E-08 2.6E-10 -4.5E-14 S19 46.51 -99.82 8.5E-04 -4.6E-05 2.4E-06 -8.7E-08 1.5E-09 1.7E-13 S20 9.64 -4.58 1.6E-03 -7.9E-05 4.0E-06 -1.1E-07 1.6E-09 -3.8E-12 S23 65.29 -82.06 -1.1E-03 2.6E-05 -2.8E-06 1.6E-07 -3.2E-09 -1.5E-11 S24 9.31 -1.89 -5.9E-04 2.6E-05 -1.3E-06 -4.5E-08 8.3E-09 -2.5E-10 S25 52.84 -65.37 -1.8E-04 1.0E-04 -2.4E-05 1.7E-06 -6.8E-08 2.2E-10 S26 -20.53 -52.96 2.3E-05 5.0E-05 -1.5E-05 7.0E-07 -2.1E-08 -2.4E-11

[0114] Wherein, E-01 represents -1 power of 10, E-02 represents -2 power of 10, and so on, and E-N represents -N power of 10.

[0115] From the above parameter data, the focal length ratio of the zoom lens 100 is as follows:

[0116] The ratio of the focal length of the zoom lens 100 at the wide-angle end to the focal length of each lens group is as follows: fw / f1=0.119; fw / f2=-0.645; fw / f3=0.228; fw / f4=0.17; fw / f5=0.156;

[0117] The ratio of the focal length of the first lens group 1 to each lens therein is as follows: f1 / f11=-0.352; f1 / f12=0.419; f1 / f13=0.361; f1 / f1112=0.607;

[0118] The ratio of the focal length of the second lens group 2 to each lens therein is as follows: f2 / f21=0.91; f2 / f22=0.664; f2 / f23=-0.504;

[0119] The ratio of the focal length of the third lens group 3 to each lens therein is as follows: f3 / f31=0.714; f3 / f32=1.067; f3 / f33=-0.955;

[0120] The ratio of the focal length of the fourth lens group 4 to each lens therein is as follows: f4 / f41=1.919; f4 / f42=-1.429;

[0121] The ratio of the distance from the stop 7 to the image plane 61 to the total optical length of the zoom lens 100: L / TTL=0.384;

[0122] The ratio of the effective clear aperture of the first lens 11 to the total optical length of the zoom lens 100:

[0123] The ratio of the movement amount of the second lens group 2 when the zoom lens 100 moves from the wide-angle end to the telephoto end to the total optical length of the zoom lens 100: ΔZW-T / TTL=0.29.

[0124] Table 3 Zoom data of the zoom lens 100 at the wide-angle end, the intermediate magnification position, and the telephoto end, respectively

[0125] Wide angle Intermediate magnification Telephoto T(7) 0.4 17 20.4 T(13) 20.7 4.1 0.8 T(20) 7.6 1.5 2.2 T(25) 1.9 8 7.3

[0126] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural changes made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A zoom lens, characterized in that: An optical axis is formed within the zoom lens. The zoom lens has an object side and an image side that are oppositely arranged along the optical axis direction. The zoom lens includes a lens barrel and a plurality of lens groups. The plurality of lens groups sequentially include, from the object side to the image side: The first lens group, having a positive optical power, is fixedly mounted on the lens barrel; The second lens group, having a negative optical power, is movably mounted on the lens barrel along the optical axis direction; The third lens group, having a positive optical power, is fixedly mounted on the lens barrel; The fourth lens group, having a positive optical power, is movably mounted on the lens barrel along the optical axis direction; and, The fifth lens group, having a positive optical power, is fixedly mounted on the lens barrel; Wherein, under the action of an external force, the second lens group moves towards the image side to make the zoom lens zoom from the wide-angle end to the telephoto end, and at the same time the fourth lens group moves along the optical axis direction to make the zoom lens focus; Wherein, the focal length of the zoom lens 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, and the focal length of the fifth lens group is f5. When the zoom lens is at the wide-angle end, within the zoom lens: 0.103 < fw / f1 < 0.14; and / or, -0.758 < fw / f2 < -0.561; and / or, 0.199 < fw / f3 < 0.269; and / or, 0.148 < fw / f4 < 0.2; and / or, 0.136 < fw / f5 < 0.184; Wherein, the first lens group sequentially includes, from the object side to the image side: The first lens, having a negative optical power; The second lens, having a positive optical power; The third lens, having a positive optical power; and, The fourth lens, having a positive optical power; Wherein, 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. Within the first lens group: -0.441 < f1 / f11 < -0.294; and / or, 0.349 < f1 / f12 < 0.523; and / or, 0.3 < f1 / f13 < 0.451; and / or, 0.506 < f1 / f14 < 0.758; The second lens group sequentially includes, from the object side to the image side: The fifth lens, having a negative optical power; The sixth lens, having a negative optical power; and, The seventh lens, having a positive optical power; Wherein, 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. Within the second lens group: 0.759 < f2 / f21 < 1.138; and / or, 0.553 < f2 / f22 < 0.83; and / or, 2. The zoom lens according to claim 1, wherein: -0.629 < f2 / f23 < -0.

42. The third lens group sequentially includes, from the object side to the image side: The eighth lens, having a positive optical power; The ninth lens, having a positive optical power; and, The tenth lens, having a negative optical power; Among them, the focal length of the eighth lens is f31, the focal length of the ninth lens is f32, and the focal length of the tenth lens is f33. Within the third lens group: 0.595 < f3 / f31 < 0.892; and / or, 0.889 < f3 / f32 < 1.334; and / or, -1.194 < f3 / f33 < -0.

796.

3. The zoom lens according to claim 1, wherein: The fourth lens group includes, in order from the object side to the image side: The eleventh lens, having a positive optical power; and, The twelfth lens, having a negative optical power; Among them, the focal length of the eleventh lens is f41, the focal length of the twelfth lens is f42. Within the fourth lens group: 1.669 < f4 / f41 < 2.258; and / or, -1.682 < f4 / f42 < -1.

243.

4. The zoom lens according to any one of claims 1 to 3, wherein: The first lens, the second lens, the third lens, and the fourth lens are all glass spherical lenses; and / or, The fifth lens is a glass spherical lens, and the sixth lens and the seventh lens are plastic aspherical lenses; and / or, The third lens group includes the eighth lens, the ninth lens, and the tenth lens. The eighth lens is a glass spherical lens, and the ninth lens and the tenth lens are plastic aspherical lenses; and / or, The fourth lens group includes the eleventh lens and the twelfth lens. The eleventh lens is a glass spherical lens, and the twelfth lens is a plastic aspherical lens; and / or, The fifth lens group includes the thirteenth lens, and the thirteenth lens is a plastic aspherical positive lens.

5. The zoom lens according to claim 1, wherein: The effective aperture of the first lens is The total optical length of the zoom lens is TTL. In the zoom lens:

6. The zoom lens according to claim 1, wherein: The relative displacement of the fourth lens when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position is ΔZ W-T , the total optical length of the zoom lens is TTL, in the zoom lens: 0.255<ΔZ W-T / TTL<0.

331.

7. The zoom lens according to claim 1, wherein: The zoom lens further includes an aperture, and the aperture is located between the second lens group and the third lens group; Among them, the distance from the aperture to the imaging surface of the zoom lens on the optical axis is L, and the overall optical length of the zoom lens is TTL. Within the zoom lens: 0.324 < L / TTL < 0.

442.

8. An imaging device, characterized in that Including the zoom lens according to any one of claims 1 to 7.

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