CN113848635B - Zoom lens with large zoom ratio - Google Patents
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- CN113848635B CN113848635B CN202111262700.4A CN202111262700A CN113848635B CN 113848635 B CN113848635 B CN 113848635B CN 202111262700 A CN202111262700 A CN 202111262700A CN 113848635 B CN113848635 B CN 113848635B
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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
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Abstract
The invention discloses a zoom lens with large zoom ratio, which 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 image plane 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 more than 1.8. The zoom lens with large zoom ratio has the advantages of reduced full focus Duan Ji, clear image quality, small temperature drift, simple structure, easy assembly, improved yield and good mass manufacturability, and adopts a four-component structure.
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 angle of view of the fixed focus lens is fixed, a product can only be applied to specific scenes, so that the fixed focus lens can not meet the use requirements in a plurality of scenes. The zoom lens with large zoom ratio is more and more popular in the market because the focal length is continuously variable, the angle of view is also continuously variable within a certain range, and the zoom lens can adapt 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 is low in definition; the angle of view 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; five-component mechanisms are mostly used, so that the manufacturability is poor and the yield is low.
In view of this, the present inventors invented a large-magnification-ratio zoom lens.
Disclosure of Invention
The invention aims to provide a large-zoom-ratio zoom lens which is small in distortion, clear in imaging, simple in structure and convenient to install.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a big zoom ratio zoom, includes from the object side to the image side along a fixed group before fixing the group in proper order of optical axis, zoom group, back fixed group and compensation group, the position of fixed group before fixing the group and back is all fixed, zoom group can follow the optical axis direction and remove in order to adjust the camera lens focus, compensation group can follow the optical axis direction and remove in order to compensate the skew of camera lens in the zoom in-process image plane position, the first lens that zoom group is close to the object side is correction lens, correction lens is aspheric lens, and its refracting index nd >1.8.
Further, the focal lengths of the front fixed group, the variable-magnification group, the rear fixed group and the compensation group are f1, f2, f3 and f4 respectively, and the following conditions are satisfied: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm,9mm < f4<10mm.
Further, the interval distance between the variable-magnification group and the rear fixed group is T1, and T1 is more than or equal to 0.72mm and less than or equal to 36mm.
Further, the interval 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 3.71mm.
Further, the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the seventh lens, the eighth lens, a diaphragm, the ninth lens, the tenth lens and the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens respectively comprise an object side surface which faces the object side and enables imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through;
The front fixing set comprises the first to fifth lenses, 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 group comprises the sixth to eighth lenses, 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 set 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 thirteenth lens is a convex surface;
The image side of the first lens is glued with the object side of the second lens, and the image side of the seventh lens is glued with the object side of the eighth lens.
Further, the focal lengths of the first lens, the second lens, the sixth lens and the ninth lens are f 1、f2、f6、f9 respectively, and satisfy the following requirements ：-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, 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 satisfy the following conditions: and nd1-nd2 >0.3.
Further, the lens satisfies: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, vd9 are the abbe numbers of the first, second, third, fourth, fifth, and ninth lenses, respectively.
Further, the first lens and the second lens have dispersion coefficients satisfying: |vd1-vd2| >40.
After the technical scheme is adopted, the invention has the following advantages:
1. The first lens of the zoom lens with large zoom ratio, which is close to the object side, adopts the glass aspheric lens with high refractive index, so that the distortion of the full focus Duan Guangxue is controlled within 10%, and the deformation of the shooting edge of the full focus section is small;
2. Using 13 pieces of glass and 1 piece of glass aspheric structures, correcting off-axis aberration by using a group of glued plates with refractive index difference larger than 0.3 in a front fixed group, and correcting long Jiao Beilv chromatic aberration by using four pieces of low-dispersion glass, so as to obtain full-focus Duan Gao definition image quality;
3. The four-component structure is used, 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 positive and negative focal power matching of different environmental temperatures, and ensures that the full focal section and different temperature conditions can be clearly imaged.
Drawings
FIG. 1 is a diagram of a zoom lens 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 according to embodiment 1 of the present invention at the longest focal length;
FIG. 3 is a graph showing the MTF curve of the zoom lens according to embodiment 1 of the present invention at the shortest focal length;
FIG. 4 is a graph showing the MTF curve of the zoom lens according to embodiment 1 of the present invention at the longest focal length;
FIG. 5 is a graph showing the focal length of the zoom lens according to embodiment 1 of the present invention at the shortest focal length;
FIG. 6 is a graph showing the focal length of the zoom lens of embodiment 1;
FIG. 7 is a lateral chromatic aberration diagram of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 8 is a lateral chromatic aberration diagram of the zoom lens of embodiment 1 of the present invention at the longest focal length;
Fig. 9 is a distortion chart of the zoom lens of embodiment 1 of the present invention at the shortest focal length;
FIG. 10 is a distortion chart of the zoom lens of embodiment 1 of the present invention at the longest focal length;
FIG. 11 is a diagram showing the optical path of a zoom lens according to embodiment 2 of the present invention at the shortest focal length;
FIG. 12 is a diagram showing the optical path of a zoom lens according to embodiment 2 of the present invention at the longest focal length;
FIG. 13 is a graph showing the MTF curve of the zoom lens according to embodiment 2 of the present invention at the shortest focal length;
FIG. 14 is a graph showing the MTF curve of a zoom lens according to embodiment 2 of the present invention at the longest focal length;
FIG. 15 is a graph showing the focal length of the zoom lens according to embodiment 2 of the present invention at the shortest focal length;
FIG. 16 is a graph showing the focal length of the zoom lens according to embodiment 2 of the present invention at the longest focal length;
FIG. 17 is a graph showing lateral chromatic aberration when the zoom lens of embodiment 2 of the present invention is at the shortest focal length;
FIG. 18 is a graph showing lateral chromatic aberration when the zoom lens of embodiment 2 of the present invention is at the longest focal length;
FIG. 19 is a distortion chart of the zoom lens of embodiment 2 of the present invention at the shortest focal length;
FIG. 20 is a distortion chart of a zoom lens according to embodiment 2 of the present invention at the longest focal length;
FIG. 21 is a diagram showing the optical path of a zoom lens according to embodiment 3 of the present invention at the shortest focal length;
FIG. 22 is a diagram showing the optical path of a zoom lens according to embodiment 3 of the present invention at the longest focal length;
FIG. 23 is a graph showing the MTF curve for a zoom lens according to embodiment 3 of the present invention at the shortest focal length;
FIG. 24 is a graph showing the MTF curve of a zoom lens according to embodiment 3 of the present invention at the longest focal length;
FIG. 25 is a graph showing the focal length of the zoom lens of embodiment 3 according to the present invention at the shortest focal length;
FIG. 26 is a graph showing the focal length of the zoom lens of embodiment 3 according to the present invention at the longest focal length;
FIG. 27 is a graph showing lateral chromatic aberration when the zoom lens of embodiment 3 of the present invention is at the shortest focal length;
FIG. 28 is a graph showing lateral chromatic aberration when the zoom lens of embodiment 3 of the present invention is at the longest focal length;
Fig. 29 is a distortion chart of embodiment 3 of the present invention when the zoom lens is at the shortest focal length;
fig. 30 is a distortion chart when the zoom lens of embodiment 3 of the present invention is at the longest focal length.
Reference numerals illustrate:
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, 16-protective sheet.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The term "a lens having a positive refractive index (or negative refractive index)" as used herein means that the paraxial refractive index of the lens calculated by Gaussian optics theory 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 surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (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 the lens data table (LENS DATA SHEET) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined to be convex.
The invention discloses a zoom lens with large zoom ratio, which 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 image plane position of the lens in the zooming process, and the zoom function of the whole lens is realized by the cooperation movement of the zoom group and the compensation group. The first lens of the zoom group close to the object side is a correcting lens, the correcting lens is an aspheric lens, both surfaces are aspheric, and the refractive index nd of the correcting lens is more than 1.8. And correcting optical distortion, thereby realizing the distortion characteristic of the full focus Duan Di.
The focal lengths of the front fixed group, the variable-magnification group, the rear fixed group and the compensation group are f1, f2, f3 and f4 respectively, and the following conditions are satisfied: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm,9mm < f4<10mm. The positive and negative focal power matching of different environmental temperatures is considered, so that clear imaging of the whole focal section and different temperature conditions is ensured.
The interval distance between the zoom group and the rear fixed group is T1, and the interval distance is changed from 0.72mm to 36mm from short focus to long focus, namely, T1 is more than or equal to 0.72mm and less than or equal to 36mm, and the T1 changes, so that the effect of changing the focal length of the lens is achieved. The interval distance between the rear fixed group and the compensation group is T2, and the interval distance from short focus to 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 T2 plays a role in compensating an image plane.
The zoom lens comprises fourteenth lenses, and 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 sequentially arranged 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 which faces the object side and passes imaging light and an image side which faces the image side and passes imaging light;
The front fixing set includes the first to fifth lenses 5, wherein the first lens element 1 has a negative refractive power, the object-side surface of the first lens element 1 is a convex surface, the image-side surface is a concave surface, the second lens element 2 has a positive refractive power, the object-side surface of the second lens element 2 is a convex surface, the image-side surface is a convex surface, the third lens element 3 has a positive refractive power, the object-side surface of the third lens element 3 is a convex surface, the image-side surface is a concave surface, the fourth lens element 4 has a positive refractive power, the object-side surface of the fourth lens element 4 is a convex surface, the image-side surface is a concave surface, the fifth lens element 5 has a positive refractive power, and the object-side surface of the fifth lens element 5 is a convex surface, and the image-side surface is a concave surface;
The zoom group includes the sixth to eighth lenses 8, wherein the sixth lens element 6 is the correction lens element, the sixth lens element 6 has a negative refractive power, an object-side surface of the sixth lens element 6 is a convex surface, an image-side surface of the sixth lens element 6 is a concave surface, the seventh lens element 7 has a negative refractive power, an object-side surface of the seventh lens element 7 is a concave surface, an image-side surface of the seventh lens element 7 is a concave surface, the eighth lens element 8 has a positive refractive power, an object-side surface of the eighth lens element 8 is a convex surface, and an image-side surface of the eighth lens element 8 is a convex surface;
The rear fixing group includes ninth to eleventh lenses 11, wherein the ninth lens element 9 has positive refractive power, the object-side surface of the ninth lens element 9 is convex, the image-side surface is convex, the tenth lens element 10 has positive refractive power, the object-side surface of the tenth lens element 10 is convex, the image-side surface is concave, the eleventh lens element 11 has negative refractive power, the object-side surface of the eleventh lens element 11 is concave, and the image-side surface is concave;
The compensation group includes twelfth to fourteenth lenses 14, wherein the twelfth lens element 12 has positive refractive power, the object-side surface of the twelfth lens element 12 is convex, the image-side surface is convex, the thirteenth lens element 13 has negative refractive power, the object-side surface of the thirteenth lens element 13 is concave, the image-side surface is convex, the fourteenth lens element 14 has positive refractive power, the object-side surface of the fourteenth lens element 14 is convex, the image-side surface is convex,
The image side of the first lens element 1 is cemented with the object side of the second lens element 2, and the image side of the seventh lens element 7 is cemented with the object side of the eighth lens element 8.
The focal lengths of the first lens 1, the second lens 2, the sixth lens 6 and the ninth lens 9 are respectively f 1、f2、f6、f9 and satisfy the following requirements ：-400mm<f1<-300mm,130mm<f2<140mm,4-10mm<f6<-9mm,16mm<f9<17mm.
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, 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 the following conditions: and nd1-nd2 >0.3 for correcting off-axis aberrations.
The lens satisfies the following conditions: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, vd9 are the dispersion coefficients of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the ninth lens 9, respectively.
Wherein, the dispersion coefficients of the first lens 1 and the second lens 2 satisfy the following conditions: and the |vd1-vd2| >40 is used for correcting the chromatic aberration of the magnification of the tele.
The second lens 2 to the fifth lens 5 all use ultra-low dispersion glass for correcting the secondary spectrum and correcting the high chromatic aberration, and simultaneously realize long focal temperature compensation by utilizing the temperature characteristic (large dn/dt) of the low dispersion glass.
The lens has the combined focal length of 3.9-47 mm, TTL less than 125mm, compact overall structure, extremely convenient installation and use and strong practicability.
The lens is maximally F/1.8 light-transmitting, large in light transmitting, high in overall shooting brightness and good in shooting effect at night.
The lens has a large field angle, the horizontal field angle HFOV is larger than 81 degrees, the overall monitoring range of the lens is improved, and the blind spot range is reduced.
The mini-type infrared imaging lens of the present invention will be described in detail with specific examples.
Example 1
Referring to fig. 1 to 2, the invention discloses a zoom lens with large zoom ratio, which comprises a front fixed group, a zoom group, a rear fixed group and a compensation group, wherein the front fixed group, the zoom group, the rear fixed group and the compensation group are sequentially arranged from an object side to an image side along an optical axis, 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 image plane position of the lens in the zooming process, and the zoom function of the whole lens is realized by the matched movement of the zoom group and the compensation group. The first lens of the zoom group close to the object side is a correcting lens, the correcting lens is an aspheric lens, and both surfaces of the correcting lens are aspheric.
In this embodiment, the zoom lens includes fourteenth lens, specifically includes 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 sequentially disposed along an optical axis from an object side to an image side, wherein each of the first lens 1 to the fourteenth lens 14 includes an object side facing the object side and passing imaging light and an image side facing the image side and passing imaging light;
The front fixing set includes the first to fifth lenses 5, wherein the first lens element 1 has a negative refractive power, the object-side surface of the first lens element 1 is a convex surface, the image-side surface is a concave surface, the second lens element 2 has a positive refractive power, the object-side surface of the second lens element 2 is a convex surface, the image-side surface is a convex surface, the third lens element 3 has a positive refractive power, the object-side surface of the third lens element 3 is a convex surface, the image-side surface is a concave surface, the fourth lens element 4 has a positive refractive power, the object-side surface of the fourth lens element 4 is a convex surface, the image-side surface is a concave surface, the fifth lens element 5 has a positive refractive power, and the object-side surface of the fifth lens element 5 is a convex surface, and the image-side surface is a concave surface;
The zoom group includes the sixth to eighth lenses 8, wherein the sixth lens element 6 is the correction lens element, the sixth lens element 6 has a negative refractive power, an object-side surface of the sixth lens element 6 is a convex surface, an image-side surface of the sixth lens element 6 is a concave surface, the seventh lens element 7 has a negative refractive power, an object-side surface of the seventh lens element 7 is a concave surface, an image-side surface of the seventh lens element 7 is a concave surface, the eighth lens element 8 has a positive refractive power, an object-side surface of the eighth lens element 8 is a convex surface, and an image-side surface of the eighth lens element 8 is a convex surface;
The rear fixing group includes ninth to eleventh lenses 11, wherein the ninth lens element 9 has positive refractive power, the object-side surface of the ninth lens element 9 is convex, the image-side surface is convex, the tenth lens element 10 has positive refractive power, the object-side surface of the tenth lens element 10 is convex, the image-side surface is concave, the eleventh lens element 11 has negative refractive power, the object-side surface of the eleventh lens element 11 is concave, and the image-side surface is concave;
the compensation group includes twelfth to fourteenth lenses 14, wherein the twelfth lens element 12 has positive refractive power, the object-side surface of the twelfth lens element 12 is convex, the image-side surface is convex, the thirteenth lens element 13 has negative refractive power, the object-side surface of the thirteenth lens element 13 is concave, the image-side surface is convex, the fourteenth lens element 14 has positive refractive power, the object-side surface of the fourteenth lens element 14 is convex, and the image-side surface is convex;
The image side of the first lens element 1 is cemented with the object side of the second lens element 2, and the image side of the seventh lens element 7 is cemented with the object side of the eighth lens element 8.
The detailed optical data at the shortest focal length of this embodiment is shown in table 1-1.
Table 1-1 detailed optical data at the shortest focal length for example 1
The detailed optical data at the longest focal length of this example is shown in tables 1-2.
Table 1-2 detailed optical data at the longest focal length for example 1
| Surface of the body | Type(s) | Caliber size (diameter) | Radius of curvature | Thickness of (L) | Refractive index | Coefficient of dispersion | Focal length |
| 0 | Sphere | 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 6 is an aspherical lens, and both surfaces thereof are aspherical. The aspherical data in this example are shown in tables 1-3.
Table 1-3 example 1 aspherical data
In this embodiment, the shortest focal length light path diagram of the zoom lens is shown in fig. 1, and the longest focal length light path diagram is shown in fig. 2. As can be seen from the graph with reference to fig. 3 and fig. 4, the MTF curve under visible light when the lens is at the shortest focal length, and the MTF value is still greater than 0.2 when the spatial frequency of the lens reaches 120lp/mm, so that the resolution can be clearly distinguished by human eyes. Referring to fig. 5, the graph of focal shift under visible light when the lens is shortest in focus is shown in fig. 6, and 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. Referring to fig. 7, the transverse chromatic aberration diagram under visible light when the lens is shortest in focus, and referring to fig. 8, it can be seen from the diagram that the transverse chromatic aberration is controlled within 12um, so as to effectively ensure that the off-axis field is not color cast. Fig. 9 shows a distortion chart under visible light when the lens is at the shortest focus, fig. 10 shows a distortion chart under visible light when the lens is at the longest focus, and the distortion is less than 10% from the chart, so that the real-scene shooting can be effectively ensured not to be deformed.
Example 2
As shown in fig. 11 to 12, the present embodiment is substantially the same as the surface irregularities and refractive index of each lens of embodiment 1, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the shortest focal length of this embodiment is shown in table 2-1.
Table 2-1 detailed optical data at example 2 shortest focal length
The detailed optical data at the longest focal length of this example is shown in table 2-2.
Table 2-2 detailed optical data at example 2 longest focal length
In this embodiment, the sixth lens 6 is an aspherical lens, and both surfaces thereof are aspherical, and aspherical data thereof are shown in tables 2 to 3.
In this embodiment, the optical path diagram of the zoom lens at the shortest focal length is shown in fig. 11, and the optical path diagram at the longest focal length is shown in fig. 12. As can be seen from fig. 14, when the spatial frequency of the lens reaches 120lp/mm, the MTF value is still greater than 0.2, and the resolution can be clearly resolved by human eyes. Referring to fig. 15, the graph of focal shift under visible light when the lens is shortest and referring to fig. 16, 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. Referring to fig. 17, a transverse color difference diagram under visible light when the lens is shortest in focus, and referring to fig. 18, it can be seen from the diagram that the transverse color difference is controlled within 12um, so that the off-axis field of view is effectively ensured not to be color cast. Fig. 19 shows a distortion chart under visible light when the lens is at the shortest focus, fig. 20 shows a distortion chart under visible light when the lens is at the longest focus, and it can be seen from the chart that the distortion is less than 10%, so that the real-scene shooting is effectively ensured not to be deformed.
Example 3
As shown in fig. 21 to 22, the present embodiment is substantially the same as the surface irregularities and refractive index of each lens of embodiment 1, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data at the shortest focal length of this embodiment is shown in table 3-1.
Table 3-1 detailed optical data at example 3 shortest focal length
The detailed optical data at the longest focal length of this example is shown in table 3-2.
Table 3-2 detailed optical data at example 3 longest focal length
In this embodiment, the sixth lens 6 is an aspherical lens, and both surfaces thereof are aspherical, and aspherical data thereof are shown in tables 3 to 3.
In this embodiment, the optical path diagram of the zoom lens at the shortest focal length is shown in fig. 21, and the optical path diagram at the longest focal length is shown in fig. 22.
As can be seen from fig. 23 and fig. 24, the MTF curve under visible light when the lens is at the shortest focal length, and the MTF value is still greater than 0.2 when the spatial frequency of the lens reaches 120lp/mm, so that the resolution can be clearly resolved by human eyes. As can be seen from fig. 26, the focus offset is controlled within 50um, so as to effectively ensure that the color of the central field of view is not distorted. Referring to fig. 27 for a lateral color difference chart under visible light when the lens is shortest in focus, referring to fig. 28 for a lateral color difference chart under visible light when the lens is longest in focus, it can be seen from the chart that the lateral color difference is controlled within 12um, so that the off-axis visual field can be effectively ensured not to be color-deviated. Fig. 29 shows a distortion chart under visible light when the lens is at the shortest focus, fig. 30 shows a distortion chart under visible light when the lens is at the longest focus, and it can be seen from the chart that the distortion is less than 14%, so that the real-scene shooting is effectively ensured not to be deformed.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a big zoom ratio zoom which characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the seventh lens, the eighth lens, a diaphragm, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens, the first to fifth lenses are front fixed groups, the sixth to eighth lenses are zoom groups, the ninth to eleventh lenses are rear fixed groups, the twelfth to fourteenth lenses are compensation groups, and each of the first to fourteenth lenses comprises an object side face which faces the object side and enables imaging light to pass and an image side face which faces the image side and enables imaging light to pass;
The first lens element has a negative refractive power, the object-side surface of the first lens element is convex, the image-side surface of the first lens element is concave, the second lens element has a positive refractive power, the object-side surface of the second lens element is convex, the image-side surface of the second lens element is convex, the third lens element has a positive refractive power, the object-side surface of the third lens element is convex, the image-side surface of the third lens element is concave, the fourth lens element has a positive refractive power, the object-side surface of the fourth lens element is convex, the image-side surface of the fourth lens element is concave, the fifth lens element has a positive refractive power, the object-side surface of the fifth lens element is convex, and the image-side surface of the fifth lens element is concave;
The sixth lens element with negative refractive power has a convex object-side surface and a concave image-side surface, and the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface, and the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the ninth lens element has a positive refractive power, wherein an object-side surface of the ninth lens element is a convex surface, an image-side surface of the ninth lens element is a convex surface, the tenth lens element has a positive refractive power, the object-side surface of the tenth lens element is a convex surface, the image-side surface of the tenth lens element is a concave surface, the eleventh lens element has a negative refractive power, the object-side surface of the eleventh lens element is a concave surface, and the image-side surface of the eleventh lens element is a concave surface;
The twelfth lens element has a positive refractive power, wherein the object-side surface of the twelfth lens element is a convex surface, the image-side surface of the twelfth lens element is a convex surface, the thirteenth lens element has a negative refractive power, the object-side surface of the thirteenth lens element is a concave surface, the image-side surface of the thirteenth lens element is a convex surface, the fourteenth lens element has a positive refractive power, the object-side surface of the fourteenth lens element is a convex surface, and the image-side surface of the fourteenth lens element is a convex surface;
The front fixing group and the rear fixing group are fixed in position, 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 image plane 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 more than 1.8;
The focal lengths of the front fixed group, the variable-magnification group, the rear fixed group and the compensation group are f1, f2, f3 and f4 respectively, and the following conditions are satisfied: 50mm < f1<60mm, -11mm < f2< -10 >, 35mm < f3<42mm,9mm < f4<10mm.
2. A high zoom ratio zoom lens according to claim 1, wherein: the interval distance between the variable-magnification group and the rear fixed group is T1, and T1 is more than or equal to 0.72mm and less than or equal to 36mm.
3. A high zoom ratio zoom lens according to claim 1, wherein: the interval 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 3.71mm.
4. A large magnification-varying ratio zoom lens as described in any one of claims 1 to 3, wherein:
The image side of the first lens is glued with the object side of the second lens, and the image side of the seventh lens is glued with the object side of the eighth lens.
5. A high zoom ratio zoom lens according to claim 4, wherein: the focal lengths of the first lens, the second lens, the sixth lens and the ninth lens are respectively f 1、f2、f6、f9, and the requirements are met ：-400mm<f1<-300mm,130mm<f2<140mm,4-10mm<f6<-9mm,16mm<f9<17mm.
6. A high zoom ratio zoom lens according to claim 4, wherein: 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, 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.
7. A high zoom ratio zoom lens according to claim 6, wherein: the refractive indexes of the first lens and the second lens meet the following conditions: and nd1-nd2 >0.3.
8. A high zoom ratio zoom lens according to claim 4, wherein: the lens satisfies the following conditions: 20< vd1<40, 50< vd2<80, 50< vd3<80, 50< vd4<80,50< vd5<80, 50< vd9<80, wherein vd1, vd2, vd3, vd4, vd5, vd9 are the abbe numbers of the first, second, third, fourth, fifth, and ninth lenses, respectively.
9. A high zoom ratio zoom lens according to claim 8, wherein: the dispersion coefficients of the first lens and the second lens satisfy the following conditions: |vd1-vd2| >40.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110709748A (en) * | 2017-06-08 | 2020-01-17 | 柯尼卡美能达株式会社 | Zoom lens and imaging device |
| CN216210203U (en) * | 2021-10-28 | 2022-04-05 | 厦门力鼎光电股份有限公司 | Zoom lens with large zoom ratio |
| CN114355591A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | Large-zoom-ratio ultra-small airborne pod optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4283553B2 (en) * | 2002-12-04 | 2009-06-24 | フジノン株式会社 | Zoom lens |
| US6982835B2 (en) * | 2003-02-05 | 2006-01-03 | Fujinon Corporation | Four-group zoom lens |
| JP4919330B2 (en) * | 2005-10-31 | 2012-04-18 | 富士フイルム株式会社 | Zoom lens |
| CN100429549C (en) * | 2005-10-31 | 2008-10-29 | 富士能株式会社 | Zoom lens |
| JP2010266505A (en) * | 2009-05-12 | 2010-11-25 | Fujifilm Corp | Zoom lens and imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110709748A (en) * | 2017-06-08 | 2020-01-17 | 柯尼卡美能达株式会社 | Zoom lens and imaging device |
| CN216210203U (en) * | 2021-10-28 | 2022-04-05 | 厦门力鼎光电股份有限公司 | Zoom lens with large zoom ratio |
| CN114355591A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | Large-zoom-ratio ultra-small airborne pod optical system |
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