CN113848635A - Zoom lens with large zoom ratio - Google Patents
Zoom lens with large zoom ratio Download PDFInfo
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- CN113848635A CN113848635A CN202111262700.4A CN202111262700A CN113848635A CN 113848635 A CN113848635 A CN 113848635A CN 202111262700 A CN202111262700 A CN 202111262700A CN 113848635 A CN113848635 A CN 113848635A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
Abstract
The invention discloses a zoom lens with a large zoom ratio, which comprises a front fixed group, a zoom group, a rear fixed group and a compensation group which are sequentially arranged along an optical axis from an object side to an image side, wherein the positions of the front fixed group and the rear fixed group are fixed, the zoom group can move along the optical axis direction to adjust the focal length of the lens, the compensation group can move along the optical axis direction to compensate the deviation of the image surface position of the lens in the zooming process, the first lens of the zoom group close to the object side is a correction lens, the correction lens is an aspheric lens, and the refractive index nd of the correction lens is greater than 1.8. The zoom lens with large zoom ratio has small distortion of the full focus section, clear image quality and small temperature drift, and adopts a four-component structure, so that the structure is simple, the assembly is easy, the yield is improved, and the mass manufacturability is good.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a zoom lens with a large zoom ratio.
Background
Because the field angle of the fixed-focus lens is fixed, one product can only be applied to specific scenes, and the fixed-focus lens cannot meet the use requirements in many scenes. The zoom lens with a large zoom ratio is more and more popular in the market because the focal length is continuously variable and the field angle is also continuously variable within a certain range, and the zoom lens is adaptable to more application scenes. The existing zoom lens with large zoom ratio mainly has the following problems: the lens distortion is large, and the requirement of video communication cannot be met; the image quality definition is low; the field angle is small, and the monitoring blind spot is large; the temperature drift amount is large, and when the temperature is too high or too low, the imaging quality is poor; the five-component mechanism is mostly used, the manufacturability is poor and the yield is low.
In view of this, the inventors of the present application invented a zoom lens with a large zoom ratio.
Disclosure of Invention
The invention aims to provide a zoom lens with a large zoom ratio, which has the advantages of small distortion, clear imaging, simple structure and convenience in installation.
In order to achieve the purpose, the invention adopts the following technical scheme: a zoom lens with a large zoom ratio comprises a front fixed group, a zoom group, a rear fixed group and a compensation group which are sequentially arranged from an object side to an image side along an optical axis, wherein the positions of the front fixed group and the rear fixed group are fixed, the zoom group can move along the optical axis direction to adjust the focal length of a lens, the compensation group can move along the optical axis direction to compensate the deviation of the position of an image surface of the lens in the zooming process, a first lens of the zoom group close to the object side is a correction lens, the correction lens is an aspheric lens, and the refractive index nd of the correction lens is larger than 1.8.
Further, the focal lengths of the front fixed set, the zoom set, the rear fixed set and the compensation set are f1, f2, f3 and f4 respectively, and satisfy: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm, 9mm < f4<10 mm.
Further, the distance between the zooming group and the rear fixed group is T1, and T1 is more than or equal to 0.72mm and less than or equal to 36 mm.
Further, the spacing distance between the rear fixed group and the compensation group is T2, and T2 is more than or equal to 4.9mm and less than or equal to 3.71 mm.
The imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a diaphragm, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens which are arranged in sequence from the object side to the image side along an optical axis, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively comprise an object side surface facing the object side and allowing the imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the front fixing group comprises the first lens, the second lens, the third lens, the fourth lens and the fifth lens, wherein the first lens has negative diopter, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has positive diopter, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, the third lens has positive diopter, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, the fourth lens has positive diopter, the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, the fifth lens has positive diopter, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the zoom lens group comprises the sixth lens, the eighth lens and the seventh lens, wherein the sixth lens is the correcting lens, the sixth lens has negative diopter, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a concave surface, the seventh lens has negative diopter, the object side surface of the seventh lens is a concave surface, the image side surface of the seventh lens is a concave surface, the eighth lens has positive diopter, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface;
the rear fixing group comprises ninth to eleventh lenses, wherein the ninth lens has positive diopter, the object side surface of the ninth lens is a convex surface, the image side surface of the ninth lens is a convex surface, the tenth lens has positive diopter, the object side surface of the tenth lens is a convex surface, the image side surface of the tenth lens is a concave surface, the eleventh lens has negative diopter, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface;
the compensation group comprises twelfth to fourteenth lenses, wherein the twelfth lens has positive diopter, the object side surface of the twelfth lens is a convex surface, the image side surface of the twelfth lens is a convex surface, the thirteenth lens has negative diopter, the object side surface of the thirteenth lens is a concave surface, the image side surface of the thirteenth lens is a convex surface, the fourteenth lens has positive diopter, the object side surface of the fourteenth lens is a convex surface, and the image side surface of the fourteenth lens is a convex surface;
the image side surface of the first lens is glued with the object side surface of the second lens, and the image side surface of the seventh lens is glued with the object side surface of the eighth lens.
Further, the focal lengths of the first lens, the second lens, the sixth lens and the ninth lens are respectively f1、f2、f6、f9And satisfies the following conditions: 400mm<f1<-300mm，130mm<f2<140mm，4-10mm<f6<-9mm，16mm<f9<17mm。
Further, the lens satisfies: 1.7< nd1<2,1.4< nd2<1.6,1.4< nd3<1.75, 1.4< nd4<1.75,1.4< nd5<1.75,1.4< nd9<1.75, wherein nd1, nd2, nd3, nd4, nd5 and nd9 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the ninth lens respectively.
Further, the refractive indexes of the first lens and the second lens meet the following conditions: and l nd1-nd2 l > 0.3.
Further, the lens satisfies: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, and 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, and vd9 are the abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the ninth lens, respectively.
Further, the abbe numbers of the first lens and the second lens satisfy: l vd1-vd2 l > 40.
After the technical scheme is adopted, the invention has the following advantages:
1. according to the zoom lens with the large zoom ratio, the first lens of the zoom group close to the object side adopts the glass aspheric lens with high refractive index, so that the optical distortion of the full-focus section is controlled within 10%, and the deformation of the shooting edge of the full-focus section is small;
2. 13 pieces of glass and 1 piece of glass are used for an aspheric structure, a group of veneers with refractive index difference larger than 0.3 is used for correcting off-axis aberration of the front fixed group, and four pieces of low-dispersion glass are used for correcting chromatic aberration of telephoto magnification, so that full-focus high-definition image quality is obtained;
3. the four-component structure is adopted, the structure is simple, the assembly is easy, the yield is improved, and the mass manufacturability is good;
4. the horizontal field angle exceeds 80 degrees, the monitoring range is large, and the blind spot is small;
5. the lens considers the matching of positive and negative focal powers at different environmental temperatures, and ensures that the full-focus section and different temperature conditions can be clearly imaged.
Drawings
FIG. 1 is a diagram of an optical path of a zoom lens system according to embodiment 1 of the present invention at a shortest focal length;
FIG. 2 is a diagram of an optical path of the zoom lens system of embodiment 1 of the present invention at the longest focal length;
FIG. 3 is a MTF curve of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 4 is a graph of MTF of the zoom lens of embodiment 1 of the present invention at the longest focal length;
FIG. 5 is a focal shift curve diagram of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 6 is a focal shift curve diagram of the zoom lens of embodiment 1 of the present invention at the longest focal length;
FIG. 7 is a diagram of lateral chromatic aberration of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 8 is a diagram of lateral chromatic aberration when the zoom lens system of embodiment 1 of the present invention is at the longest focal length;
FIG. 9 is a distortion diagram of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 10 is a distortion diagram of the zoom lens of embodiment 1 of the present invention at the longest focal length;
FIG. 11 is a diagram of an optical path of the zoom lens system of embodiment 2 of the present invention at the shortest focal length;
FIG. 12 is a diagram of an optical path of the zoom lens system of embodiment 2 of the present invention at the longest focal length;
FIG. 13 is a MTF curve of the zoom lens of embodiment 2 of the present invention at the shortest focal length;
FIG. 14 is a graph of MTF of the zoom lens system of embodiment 2 of the present invention at the longest focal length;
FIG. 15 is a focal shift curve diagram of the zoom lens of embodiment 2 of the present invention at the shortest focal length;
FIG. 16 is a focal shift curve diagram of the zoom lens of embodiment 2 of the present invention at the longest focal length;
FIG. 17 is a diagram of lateral chromatic aberration of the zoom lens of embodiment 2 of the present invention at the shortest focal length;
FIG. 18 is a diagram showing lateral chromatic aberration when the zoom lens system of embodiment 2 of the present invention has the longest focal length;
FIG. 19 is a distortion diagram of a zoom lens system according to embodiment 2 of the present invention at the shortest focal length;
FIG. 20 is a distortion diagram of the zoom lens of embodiment 2 of the present invention at the longest focal length;
FIG. 21 is a schematic diagram showing an optical path of a zoom lens system of embodiment 3 of the present invention at a shortest focal length;
FIG. 22 is a diagram illustrating an optical path when the zoom lens system of embodiment 3 of the present invention has a longest focal length;
FIG. 23 is a MTF curve of the zoom lens of embodiment 3 of the present invention at the shortest focal length;
FIG. 24 is a graph of MTF of the zoom lens of embodiment 3 of the present invention at the longest focal length;
FIG. 25 is a focal shift curve diagram of the zoom lens of embodiment 3 of the present invention with the shortest focal length;
FIG. 26 is a graph showing the focal shift of the zoom lens of embodiment 3 of the present invention at its longest focal length;
FIG. 27 is a diagram showing lateral chromatic aberration when the zoom lens system of embodiment 3 of the present invention is at the shortest focal length;
FIG. 28 is a diagram showing lateral chromatic aberration when the zoom lens system of embodiment 3 of the present invention has the longest focal length;
FIG. 29 is a distortion diagram of the zoom lens of embodiment 3 of the present invention at the shortest focal length;
FIG. 30 is a distortion diagram of the zoom lens system of embodiment 3 of the present invention at the longest focal length.
Description of reference numerals:
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-seventh lens, 8-eighth lens, 9-ninth lens, 10-tenth lens, 11-eleventh lens, 12-twelfth lens, 13-thirteenth lens, 14-fourteenth lens, 15-diaphragm and 16-protective sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses a zoom lens with a large zoom ratio, which comprises a front fixed group, a zoom group, a rear fixed group and a compensation group which are sequentially arranged along an optical axis from an object side to an image side, wherein the positions of the front fixed group and the rear fixed group are fixed, the zoom group can move along the optical axis direction to adjust the focal length of the lens, the compensation group can move along the optical axis direction to compensate the deviation of the image surface position of the lens in the zooming process, and the zoom function of the whole lens is realized by the matching movement of the zoom group and the compensation group. The first lens of the variable power group close to the object side is a correction lens, the correction lens is an aspheric lens, both surfaces of the correction lens are aspheric surfaces, and the refractive index nd of the correction lens is larger than 1.8. And optical distortion is corrected, so that the low distortion characteristic of the full focal length is realized.
The focal lengths of the front fixed group, the zooming group, the rear fixed group and the compensation group are respectively f1, f2, f3 and f4, and satisfy the following conditions: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm, 9mm < f4<10 mm. The positive and negative focal power matching at different environmental temperatures is considered, so that clear imaging can be ensured in the full-focus section and under different temperature conditions.
The distance between the zoom group and the rear fixed group is T1, the distance from the short focus to the long focus is changed from 0.72mm to 36mm, namely, T1 is more than or equal to 0.72mm and less than or equal to 36mm, and the change of T1 plays a role in changing the focal length of the lens. The spacing distance between the rear fixed group and the compensation group is T2, the spacing distance from the short focus to the long focus is changed from 4.9mm to 3.71mm, namely the T2 is more than or equal to 4.9mm and less than or equal to 3.71mm, and the change of T2 plays a role in compensating an image plane.
The zoom lens comprises fourteen lenses, specifically comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a diaphragm 15, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13 and a fourteenth lens 14 which are arranged in sequence from an object side to an image side along an optical axis, wherein each of the first lens 1 to the fourteenth lens 14 comprises an object side surface facing the object side and allowing imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through;
the front fixing group comprises the first to fifth lenses 5, wherein the first lens 1 has negative diopter, the object side surface of the first lens 1 is a convex surface, the image side surface is a concave surface, the second lens 2 has positive diopter, the object side surface of the second lens 2 is a convex surface, the image side surface is a convex surface, the third lens 3 has positive diopter, the object side surface of the third lens 3 is a convex surface, the image side surface is a concave surface, the fourth lens 4 has positive diopter, the object side surface of the fourth lens 4 is a convex surface, the image side surface is a concave surface, the fifth lens 5 has positive diopter, the object side surface of the fifth lens 5 is a convex surface, and the image side surface is a concave surface;
the zoom lens group comprises the sixth lens 8 to the eighth lens 8, wherein the sixth lens 6 is the correcting lens, the sixth lens 6 has negative diopter, the object side surface of the sixth lens 6 is a convex surface, the image side surface is a concave surface, the seventh lens 7 has negative diopter, the object side surface of the seventh lens 7 is a concave surface, the image side surface is a concave surface, the eighth lens 8 has positive diopter, the object side surface of the eighth lens 8 is a convex surface, and the image side surface is a convex surface;
the rear fixing group comprises ninth to eleventh lenses 11, wherein the ninth lens 9 has positive diopter, the object-side surface of the ninth lens 9 is a convex surface, the image-side surface is a convex surface, the tenth lens 10 has positive diopter, the object-side surface of the tenth lens 10 is a convex surface, the image-side surface is a concave surface, the eleventh lens 11 has negative diopter, the object-side surface of the eleventh lens 11 is a concave surface, and the image-side surface is a concave surface;
the compensation group comprises twelfth to fourteenth lenses 14, wherein the twelfth lens 12 has positive refractive power, the object-side surface of the twelfth lens 12 is convex, the image-side surface of the twelfth lens is convex, the thirteenth lens 13 has negative refractive power, the object-side surface of the thirteenth lens 13 is concave, the image-side surface of the thirteenth lens is convex, the fourteenth lens 14 has positive refractive power, the object-side surface of the fourteenth lens 14 is convex, and the image-side surface of the fourteenth lens is convex,
the image side surface of the first lens 1 is cemented with the object side surface of the second lens 2, and the image side surface of the seventh lens 7 is cemented with the object side surface of the eighth lens 8.
The focal lengths of the first lens 1, the second lens 2, the sixth lens 6 and the ninth lens 9 are respectively f1、f2、f6、f9And satisfies the following conditions: 400mm<f1<-300mm，130mm<f2<140mm，4-10mm<f6<-9mm，16mm<f9<17mm。
The lens satisfies the following conditions: 1.7< nd1<2,1.4< nd2<1.6,1.4< nd3<1.75, 1.4< nd4<1.75,1.4< nd5<1.75,1.4< nd9<1.75, wherein nd1, nd2, nd3, nd4, nd5 and nd9 are refractive indexes of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the ninth lens 9 respectively.
Wherein, the refractive indexes of the first lens 1 and the second lens 2 satisfy: and the absolute value of nd1-nd2 is larger than 0.3, and is used for correcting the off-axis aberration.
The lens satisfies the following conditions: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, and 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, and vd9 are the abbe numbers of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the ninth lens 9, respectively.
Wherein, the dispersion coefficients of the first lens 1 and the second lens 2 satisfy: and | vd1-vd2| 40, which is used for correcting chromatic aberration of long focus.
The second lens 2 to the fifth lens 5 all use ultra-low dispersion glass for correcting the secondary spectrum and correcting the high-level chromatic aberration, and simultaneously realize the long-focus temperature compensation by utilizing the temperature characteristic (large dn/dt) of the low-dispersion glass.
The combined focal length of the lens is 3.9-47 mm, TTL is less than 125mm, the whole structure is compact, the installation and the use are very convenient, and the practicability is strong.
The lens is designed to have the maximum F/1.8 light passing, large light passing and high overall shooting brightness, and has good shooting effect at night.
The field angle of the lens is large, the horizontal field angle HFOV is greater than 81 degrees, the whole monitoring range of the lens is improved, and the blind spot range is reduced.
The mini infrared imaging lens of the present invention will be described in detail with specific embodiments.
Example 1
Referring to fig. 1 to 2, the present invention discloses a zoom lens with a large zoom ratio, which includes a front fixed group, a zoom group, a rear fixed group and a compensation group sequentially arranged along an optical axis from an object side to an image side, wherein the positions of the front fixed group and the rear fixed group are fixed, the zoom group can move along the optical axis direction to adjust the focal length of the lens, the compensation group can move along the optical axis direction to compensate the shift of the image plane position of the lens in the zooming process, and the zoom function of the entire lens is realized by the matching movement of the zoom group and the compensation group. The first lens of the zoom group close to the object side is a correction lens, the correction lens is an aspheric lens, and both surfaces of the correction lens are aspheric surfaces.
In this embodiment, the zoom lens includes a fourteenth lens element, specifically including, in order from an object side to an image side along an optical axis, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7, an eighth lens element 8, a diaphragm 15, a ninth lens element 9, a tenth lens element 10, an eleventh lens element 11, a twelfth lens element 12, a thirteenth lens element 13, and a fourteenth lens element 14, where the first lens element 1 to the fourteenth lens element 14 each include an object side surface facing the object side and passing the imaging light rays therethrough and an image side surface facing the image side and passing the imaging light rays therethrough;
the front fixing group comprises the first to fifth lenses 5, wherein the first lens 1 has negative diopter, the object side surface of the first lens 1 is a convex surface, the image side surface is a concave surface, the second lens 2 has positive diopter, the object side surface of the second lens 2 is a convex surface, the image side surface is a convex surface, the third lens 3 has positive diopter, the object side surface of the third lens 3 is a convex surface, the image side surface is a concave surface, the fourth lens 4 has positive diopter, the object side surface of the fourth lens 4 is a convex surface, the image side surface is a concave surface, the fifth lens 5 has positive diopter, the object side surface of the fifth lens 5 is a convex surface, and the image side surface is a concave surface;
the zoom lens group comprises the sixth lens 8 to the eighth lens 8, wherein the sixth lens 6 is the correcting lens, the sixth lens 6 has negative diopter, the object side surface of the sixth lens 6 is a convex surface, the image side surface is a concave surface, the seventh lens 7 has negative diopter, the object side surface of the seventh lens 7 is a concave surface, the image side surface is a concave surface, the eighth lens 8 has positive diopter, the object side surface of the eighth lens 8 is a convex surface, and the image side surface is a convex surface;
the rear fixing group comprises ninth to eleventh lenses 11, wherein the ninth lens 9 has positive diopter, the object-side surface of the ninth lens 9 is a convex surface, the image-side surface is a convex surface, the tenth lens 10 has positive diopter, the object-side surface of the tenth lens 10 is a convex surface, the image-side surface is a concave surface, the eleventh lens 11 has negative diopter, the object-side surface of the eleventh lens 11 is a concave surface, and the image-side surface is a concave surface;
the compensation group comprises twelfth to fourteenth lenses 14, wherein the twelfth lens 12 has positive diopter, the object-side surface of the twelfth lens 12 is a convex surface, the image-side surface is a convex surface, the thirteenth lens 13 has negative diopter, the object-side surface of the thirteenth lens 13 is a concave surface, the image-side surface is a convex surface, the fourteenth lens 14 has positive diopter, the object-side surface of the fourteenth lens 14 is a convex surface, and the image-side surface is a convex surface;
the image side surface of the first lens 1 is cemented with the object side surface of the second lens 2, and the image side surface of the seventh lens 7 is cemented with the object side surface of the eighth lens 8.
The detailed optical data at the shortest focal length of the present embodiment is shown in table 1-1.
Table 1-1 detailed optical data for example 1 at shortest focal length
The detailed optical data at the longest focal length of this embodiment is shown in tables 1-2.
Table 1-2 detailed optical data for example 1 at longest focal length
| Surface of | Type (B) | Caliber size (diameter) | Radius of curvature | Thickness of | Refractive index | Coefficient of dispersion | |
|
| 0 | | infinity | infinity | |||||
| 1 | Sphere | 41.273 | 275.421 | 1.600 | 1.940 | 17.900 | -89.367 | |
| 2 | Sphere | 36.998 | 64.747 | 15.134 | 1.460 | 86.300 | 131.332 | |
| 3 | Sphere | 36.021 | -972.636 | 0.100 | ||||
| 4 | Sphere | 32.440 | 97.598 | 7.248 | 1.470 | 56.700 | 249.109 | |
| 5 | Sphere | 31.143 | 522.115 | 0.100 | ||||
| 6 | Sphere | 30.316 | 67.395 | 7.926 | 1.600 | 54.600 | 153.192 | |
| 7 | Sphere | 29.705 | 229.752 | 0.100 | ||||
| 8 | Sphere | 27.339 | 42.615 | 7.720 | 1.720 | 40.800 | 98.747 | |
| 9 | Sphere | 26.584 | 95.959 | 35.796 | ||||
| 10 | Asphere | 11.299 | 39.421 | 0.800 | 1.950 | 24.100 | -9.873 | |
| 11 | Asphere | 7.431 | 7.591 | 7.562 | ||||
| 12 | Sphere | 7.430 | -12.640 | 0.800 | 1.710 | 33.500 | -10.210 | |
| 13 | Sphere | 8.165 | 17.837 | 4.284 | 1.950 | 17.900 | 11.931 | |
| 14 | Sphere | 8.224 | -28.657 | 0.100 | ||||
| 15 | Sphere | 5.343 | infinity | 1.700 | ||||
| 16 | Sphere | 6.022 | 10.446 | 4.865 | 1.500 | 38.400 | 16.181 | |
| 17 | Sphere | 5.729 | -33.288 | 0.100 | ||||
| 18 | Sphere | 5.239 | 12.683 | 1.866 | 1.980 | 25.4 | 21.239 | |
| 19 | Sphere | 4.824 | 29.382 | 1.040 | ||||
| 20 | Sphere | 4.715 | -24.386 | 3.355 | 1.930 | 20.2 | -6.249 | |
| 21 | Sphere | 3.939 | 8.242 | 3.711 | ||||
| 22 | Sphere | 4.857 | 20.941 | 3.318 | 1.720 | 60.4 | 9.008 | |
| 23 | Sphere | 5.023 | -8.973 | 0.100 | ||||
| 24 | Sphere | 5.003 | -8.759 | 0.800 | 1.940 | 17.9 | -15.487 | |
| 25 | Sphere | 5.354 | -22.426 | 0.100 | ||||
| 26 | Sphere | 5.661 | 14.776 | 9.074 | 1.720 | 54.6 | 14.686 | |
| 27 | Sphere | 5.031 | -29.159 | 4.970 | ||||
| 28 | Sphere | 3.474 | infinity | 0.438 | 1.510 | 64.2 | infinity | |
| 29 | Sphere | 3.388 | infinity | 0.292 |
In this embodiment, the sixth lens element 6 is an aspheric lens element, and both surfaces thereof are aspheric. The aspherical surface data in this embodiment are shown in tables 1 to 3.
Tables 1-3 example 1 aspheric data
In this embodiment, an optical path diagram of the zoom lens at the shortest focus is shown in fig. 1, and an optical path diagram at the longest focus is shown in fig. 2. Please refer to fig. 3 for the MTF graph under visible light when the lens is in the shortest focus, and fig. 4 for the MTF graph under visible light when the lens is in the longest focus, it can be seen from the graph that when the spatial frequency of the lens reaches 120lp/mm, the MTF value is still greater than 0.2, and human eyes can clearly distinguish the resolution. Please refer to fig. 5 for the focal shift curve under visible light when the lens is in the shortest focus, and fig. 6 for the focal shift curve under visible light when the lens is in the longest focus, it can be seen from the graph that the focal shift is controlled within 50um, so as to effectively ensure that the color of the central view field is not distorted. Please refer to fig. 7 for the lateral chromatic aberration diagram under visible light when the lens is in the shortest focus, and fig. 8 for the lateral chromatic aberration diagram under visible light when the lens is in the longest focus, which shows that the lateral chromatic aberration is controlled within 12um, so as to effectively ensure that the off-axis viewing field does not color cast. Please refer to fig. 9 for the distortion diagram under visible light when the lens is in the shortest focus, and refer to fig. 10 for the distortion diagram under visible light when the lens is in the longest focus, as can be seen from the diagram, the distortion is less than 10%, and the real-scene shooting can be effectively ensured not to be deformed.
Example 2
As shown in fig. 11 to 12, in this example, the surface-type convexo-concave and the refractive index of each lens element are substantially the same as those of the lens element of example 1, and the optical parameters such as the curvature radius of each lens element surface and the lens element thickness are different.
The detailed optical data at the shortest focal length of the present embodiment is shown in table 2-1.
Table 2-1 example 2 detailed optical data at shortest focal length
The detailed optical data at the longest focal length of this embodiment is shown in table 2-2.
Table 2-2 detailed optical data for example 2 at longest focal length
In this embodiment, the sixth lens element 6 is an aspheric lens element with both surfaces thereof being aspheric, and the aspheric data thereof are shown in tables 2-3.
In this embodiment, an optical path diagram of the zoom lens at the shortest focus is shown in fig. 11, and an optical path diagram at the longest focus is shown in fig. 12. Please refer to fig. 13 for the MTF graph under visible light in the shortest focus of the lens, and fig. 14 for the MTF graph under visible light in the longest focus of the lens, it can be seen from the graph that when the spatial frequency of the lens reaches 120lp/mm, the MTF value is still greater than 0.2, and the human eye can clearly distinguish the resolution. Please refer to fig. 15 for the focal shift curve under visible light when the lens is in the shortest focus, and fig. 16 for the focal shift curve under visible light when the lens is in the longest focus, it can be seen from the figure that the focal shift is controlled within 50um, which can effectively ensure that the color of the central view field is not distorted. Please refer to fig. 17 for the lateral chromatic aberration diagram under visible light when the lens is in the shortest focus, and fig. 18 for the lateral chromatic aberration diagram under visible light when the lens is in the longest focus, which shows that the lateral chromatic aberration is controlled within 12um, so as to effectively ensure that the off-axis viewing field does not color cast. Please refer to fig. 19 for the distortion diagram under visible light when the lens is in the shortest focus, and fig. 20 for the distortion diagram under visible light when the lens is in the longest focus, which can be seen from the figure that the distortion is less than 10%, which can effectively ensure that the live-action shooting is not distorted.
Example 3
As shown in fig. 21 to 22, in this embodiment, the surface-type convexo-concave and the refractive index of each lens element are substantially the same as those of the lens element of embodiment 1, and the optical parameters such as the curvature radius of each lens element surface and the lens element thickness are different.
The detailed optical data at the shortest focal length of the present embodiment is shown in table 3-1.
Table 3-1 example 3 detailed optical data at shortest focal length
The detailed optical data at the longest focal length of this embodiment is shown in table 3-2.
Table 3-2 detailed optical data for example 3 at longest focal length
In this embodiment, the sixth lens element 6 is an aspheric lens element with both surfaces thereof being aspheric, and the aspheric data thereof is shown in tables 3-3.
In this embodiment, an optical path diagram of the zoom lens at the shortest focus is shown in fig. 21, and an optical path diagram at the longest focus is shown in fig. 22.
Fig. 23 shows the MTF curve under visible light when the lens is in the shortest focus, fig. 24 shows the MTF curve under visible light when the lens is in the longest focus, and it can be seen from the graph that when the spatial frequency of the lens reaches 120lp/mm, the MTF value is still greater than 0.2, and human eyes can clearly distinguish the resolution. Please refer to fig. 25 for the focal shift curve under visible light when the lens is in the shortest focus, and fig. 26 for the focal shift curve under visible light when the lens is in the longest focus, it can be seen from the figure that the focal shift is controlled within 50um, which can effectively ensure that the color of the central view field is not distorted. Please refer to fig. 27 for the lateral chromatic aberration diagram under visible light when the lens is in the shortest focus, and fig. 28 for the lateral chromatic aberration diagram under visible light when the lens is in the longest focus, which shows that the lateral chromatic aberration is controlled within 12um, so as to effectively ensure that the off-axis viewing field does not color cast. Please refer to fig. 29 for distortion diagram under visible light when the lens is in the shortest focus, and fig. 30 for distortion diagram under visible light when the lens is in the longest focus, as can be seen from the figure, the distortion is less than 14%, and the real-scene shooting can be effectively ensured not to be deformed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A zoom lens with a large zoom ratio, comprising: the zoom lens comprises a front fixed group, a zoom group, a rear fixed group and a compensation group which are sequentially arranged from an object side to an image side along an optical axis, wherein the positions of the front fixed group and the rear fixed group are fixed, the zoom group can move along the optical axis direction to adjust the focal length of the lens, the compensation group can move along the optical axis direction to compensate the offset of the position of an image surface of the lens in the zooming process, a first lens of the zoom group close to the object side is a correction lens, the correction lens is an aspheric lens, and the refractive index nd of the correction lens is greater than 1.8.
2. A large magnification-varying zoom lens according to claim 1, wherein: the focal lengths of the front fixed group, the zooming group, the rear fixed group and the compensation group are respectively f1, f2, f3 and f4, and satisfy the following conditions: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm, 9mm < f4<10 mm.
3. A large magnification-varying zoom lens according to claim 1, wherein: the distance between the zooming group and the rear fixed group is T1, and T1 is more than or equal to 0.72mm and less than or equal to 36 mm.
4. A large magnification-varying zoom lens according to claim 1, wherein: the spacing distance between the rear fixed group and the compensation group is T2, and T2 is more than or equal to 4.9mm and less than or equal to 3.71 mm.
5. A large magnification-varying ratio zoom lens according to any one of claims 1 to 4, wherein: the zoom lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a diaphragm, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens to the fourteenth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the front fixing group comprises the first lens, the second lens, the third lens, the fourth lens and the fifth lens, wherein the first lens has negative diopter, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has positive diopter, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, the third lens has positive diopter, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, the fourth lens has positive diopter, the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, the fifth lens has positive diopter, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the zoom lens group comprises the sixth lens, the eighth lens and the seventh lens, wherein the sixth lens is the correcting lens, the sixth lens has negative diopter, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a concave surface, the seventh lens has negative diopter, the object side surface of the seventh lens is a concave surface, the image side surface of the seventh lens is a concave surface, the eighth lens has positive diopter, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface;
the rear fixing group comprises ninth to eleventh lenses, wherein the ninth lens has positive diopter, the object side surface of the ninth lens is a convex surface, the image side surface of the ninth lens is a convex surface, the tenth lens has positive diopter, the object side surface of the tenth lens is a convex surface, the image side surface of the tenth lens is a concave surface, the eleventh lens has negative diopter, the object side surface of the eleventh lens is a concave surface, and the image side surface of the eleventh lens is a concave surface;
the compensation group comprises twelfth to fourteenth lenses, wherein the twelfth lens has positive diopter, the object side surface of the twelfth lens is a convex surface, the image side surface of the twelfth lens is a convex surface, the thirteenth lens has negative diopter, the object side surface of the thirteenth lens is a concave surface, the image side surface of the thirteenth lens is a convex surface, the fourteenth lens has positive diopter, the object side surface of the fourteenth lens is a convex surface, and the image side surface of the fourteenth lens is a convex surface;
the image side surface of the first lens is glued with the object side surface of the second lens, and the image side surface of the seventh lens is glued with the object side surface of the eighth lens.
6. A large magnification-varying zoom lens according to claim 5, wherein: the focal lengths of the first lens, the second lens, the sixth lens and the ninth lens are respectively f1、f2、f6、f9And satisfies the following conditions: 400mm<f1<-300mm，130mm<f2<140mm，4-10mm<f6<-9mm，16mm<f9<17mm。
7. A large magnification-varying zoom lens according to claim 5, wherein: the lens satisfies the following conditions: 1.7< nd1<2,1.4< nd2<1.6,1.4< nd3<1.75, 1.4< nd4<1.75,1.4< nd5<1.75,1.4< nd9<1.75, wherein nd1, nd2, nd3, nd4, nd5 and nd9 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the ninth lens respectively.
8. A large magnification-varying zoom lens according to claim 7, wherein: the refractive indexes of the first lens and the second lens meet that: and l nd1-nd2 l > 0.3.
9. A large magnification-varying zoom lens according to claim 5, wherein: the lens satisfies the following conditions: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, and 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, and vd9 are the abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the ninth lens, respectively.
10. A large magnification-varying zoom lens according to claim 9, wherein: the dispersion coefficients of the first lens and the second lens meet the following conditions: l vd1-vd2 l > 40.
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| CN114355593A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | High-definition multi-component large-zoom-ratio optical zoom lens and imaging method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114355593A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | High-definition multi-component large-zoom-ratio optical zoom lens and imaging method thereof |
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