CN113703144B - High-pixel large-target-surface lens - Google Patents
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- CN113703144B CN113703144B CN202111130950.2A CN202111130950A CN113703144B CN 113703144 B CN113703144 B CN 113703144B CN 202111130950 A CN202111130950 A CN 202111130950A CN 113703144 B CN113703144 B CN 113703144B
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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
- G02B15/163—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
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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
- G02B15/142—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 two groups only
- G02B15/1421—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 two groups only the first group being positive
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Abstract
The invention discloses a high-pixel large-target-surface lens, which comprises a first lens group with positive focal power and a second lens group with negative focal power, wherein the first lens group is sequentially arranged from an object side to an image side, the first lens group comprises a front lens group with positive focal power, an aperture diaphragm and a rear lens group with positive focal power, the front lens group comprises a first lens with negative focal power, the first lens is a biconcave lens, the first lens group moves along an optical axis during focusing, and the second lens group is fixed relative to an image surface. The lens can improve the resolution of the lens, improve the image quality, reduce the distortion, realize full-image-width imaging and small-size light weight, and meet the requirements of large target surface and high-pixel imaging performance in a wide working distance by reasonably setting the focal power and focal length ratio of the first lens group and the second lens group, the focal power and focal length ratio of the front lens group and the rear lens group, and the shape of the first lens in the front lens group and the curvature radius of the object side surface.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a high-pixel large-target-surface lens.
Background
With the continuous development of industrial automation in recent years, the automation degree of a production line is higher and higher, and the industrial lens is required to be increased continuously in the large-scale manufacturing industry, especially in the fields of LCD panel detection, printed products, grain screening, tobacco foreign matter removal and the like, which has the characteristics of wide range, high speed, high precision and the like.
However, the optical magnification and imaging picture of the lens in the prior art are smaller, the lens cannot be matched with a large target surface photoreceptor, and particularly the lens has low resolution, large distortion, poor color and contrast under industrial application, short-distance imaging is caused, and along with the continuous improvement of detection precision, higher requirements are correspondingly put on the imaging quality of the lens, and the existing lens is limited in some fields with higher requirements on the imaging quality. Therefore, the development of industrial lenses with high resolution and large target surface is more urgent.
Disclosure of Invention
The invention aims to solve the problems, and provides a high-pixel large-target-surface lens which can improve the resolution of the lens, improve the image quality, reduce distortion, maintain good imaging performance in a wide working distance, realize full-image imaging and small-size light weight, and meet the imaging performance of a large target surface and high pixels.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The invention provides a high-pixel large-target-surface lens, which comprises a first lens group G 1 with positive focal power and a second lens group G 2 with negative focal power, wherein the first lens group G 1 is sequentially arranged from an object side to an image side, the first lens group G 1 comprises a front lens group G f with positive focal power, an aperture diaphragm and a rear lens group G b with positive focal power, the front lens group G f with positive focal power, the aperture diaphragm and the rear lens group G b with positive focal power are sequentially arranged from the object side to the image side, the first lens group G 1 moves along an optical axis during focusing, and the second lens group G 2 is fixed relative to an image surface and meets the following conditions:
Wherein f 1 is the focal length of the first lens group G 1, f 2 is the focal length of the second lens group G 2, f a is the focal length of the front lens group G f, and f b is the focal length of the rear lens group G b.
Preferably, the front lens group G f includes a first lens L 11 having negative optical power, the first lens L 11 is a biconcave lens, and the following condition is satisfied:
Wherein R 1 is the object-side radius of curvature of the first lens element L 11, f is the focal length of the lens element, TTL is the total optical length of the lens element, ω is the half field angle of the lens element, and D is the maximum effective radius of the first lens element L 11.
Preferably, the front lens group G f further includes a second lens L 12 having positive optical power, a third lens L 13 having positive optical power, a fourth lens L 14, and a fifth lens L 15, and the first lens L 11, the second lens L 12, the third lens L 13, the fourth lens L 14, and the fifth lens L 15 are disposed in order from the object side to the image side.
Preferably, the second lens L 12 and the third lens L 13 are both biconvex lenses, the fourth lens L 14 is a cemented lens or a biconvex lens, and the fifth lens L 15 is a meniscus lens.
Preferably, the rear lens group G b includes a sixth lens L 21 having negative optical power, the sixth lens L 21 includes a fifteenth lens L p having positive optical power and a sixteenth lens L m having negative optical power, which are cemented in order from an object side to an image side, and the following condition is satisfied:
ndm≥1.90,υdm≤26,υdp≥55
Where n dm is the d-line refractive index of the sixteenth lens L m, v dm is the abbe number of the sixteenth lens L m, and v dp is the abbe number of the fifteenth lens L p.
Preferably, the rear lens group G b further includes a seventh lens L 22 having positive optical power and an eighth lens L 23 having positive optical power, and the sixth lens L 21, the seventh lens L 22, and the eighth lens L 23 are disposed in order from the object side to the image side.
Preferably, the seventh lens L 22 is a meniscus lens and the eighth lens L 23 is a biconvex lens or a meniscus lens.
Preferably, the rear lens group G b further includes a ninth lens L 24 and a tenth lens L 25 having positive and negative optical powers with each other, the sixth lens L 21, the seventh lens L 22, the eighth lens L 23, the ninth lens L 24 and the tenth lens L 25 being disposed in order from the object side to the image side, the seventh lens L 22 being a biconvex lens or a meniscus lens, the eighth lens L 23 being a biconvex lens, and the ninth lens L 24 and the tenth lens L 25 being biconcave lenses or biconvex lenses.
Preferably, the second lens group G 2 includes an eleventh lens L 31 having positive optical power and a twelfth lens L 32 having negative optical power, which are disposed in order from the object side to the image side, the eleventh lens L 31 being a meniscus lens, and the twelfth lens L 32 being a concave flat lens.
Preferably, the second lens group G 2 further includes a thirteenth lens L 33 having positive optical power and a fourteenth lens L 34 having negative optical power, the eleventh lens L 31, the twelfth lens L 32, the thirteenth lens L 33 and the fourteenth lens L 34 are disposed in order from the object side to the image side, the eleventh lens L 31 is a biconvex lens, the twelfth lens L 32 is a biconcave lens, and the thirteenth lens L 33 and the fourteenth lens L 34 are meniscus lenses.
Compared with the prior art, the invention has the beneficial effects that:
1) The lens is focused by moving the first lens group along the optical axis, and the focal power and focal length ratio range of the first lens group and the second lens group and the focal power and focal length ratio range of the front lens group and the rear lens group are limited, so that the resolution of the lens can be improved, the image quality can be improved, the distortion can be reduced, and good imaging performance can be maintained in a wide working distance, so that the lens has a large target surface and meets the requirement of high pixels, full-image imaging is realized, the diagonal line of the target surface is 46mm, and the resolution reaches one hundred million pixels;
2) The lens shape and the curvature radius of the object side surface of the object side first lens in the front lens group are controlled, and the ratio of the total optical length of the lens to the optical caliber and the angle of view of the first lens is limited, so that the distortion aberration can be effectively corrected, the total optical length is shortened, the weight of the lens is reduced, the imaging of a large target surface is realized, and the miniaturization and the light weight of the lens are realized;
3) The refractive index and Abbe number of the material of the first lens on the object side in the rear lens group are reasonably distributed, the material with high refractive index is selected for the first lens, the introduction of spherical aberration and coma aberration can be reduced while the negative optical power is increased, meanwhile, chromatic aberration correction can be carried out by gluing with the optical material with low dispersion, the secondary spectrum is reduced, the position chromatic aberration and the chromatic aberration of magnification of an optical system can be controlled, and high-quality imaging is realized while the large target surface is met.
Drawings
FIG. 1 is a schematic view of a lens structure according to an embodiment of the invention;
FIG. 2 is a graph of aberrations of a 500mm object distance according to an embodiment of the invention;
FIG. 3 is a graph of MTF for a 500mm working object distance in accordance with an embodiment of the present invention;
FIG. 4 is a graph of MTF for a working object distance of 1000mm in accordance with an embodiment of the present invention;
FIG. 5 is a graph of MTF for a working object distance of 250mm in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a two-lens structure according to an embodiment of the invention;
FIG. 7 is a graph of aberrations at 500mm object distance for the second embodiment of the invention;
FIG. 8 is a graph of MTF for a 500mm working object distance according to an embodiment of the present invention;
FIG. 9 is a graph of MTF for a second working object distance of 1000mm in accordance with an embodiment of the present invention;
FIG. 10 is a graph of MTF at 250mm working object distance for an embodiment of the present invention;
FIG. 11 is a schematic view of a three-lens structure according to an embodiment of the present invention;
FIG. 12 is a graph of aberrations at 500mm working object distance for a third embodiment of the invention;
FIG. 13 is a graph of MTF for a three-task distance of 500mm in accordance with an embodiment of the present invention;
FIG. 14 is a graph of MTF for a three-task distance of 1000mm in accordance with an embodiment of the present invention;
FIG. 15 is a graph of MTF for a three-task distance of 150mm in accordance with an embodiment of the present invention;
FIG. 16 is a diagram illustrating a fourth lens structure according to an embodiment of the present invention;
FIG. 17 is an aberration diagram of a quadruple crop of 500 mm;
FIG. 18 is a graph of MTF for a quadruple crop spacing of 500mm according to an embodiment of the present invention;
FIG. 19 is a graph of MTF for a quadruple crop of 1000mm in accordance with an embodiment of the present invention;
FIG. 20 is a graph of MTF for a quadruple crop of 150mm according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1, a high-pixel large-target lens includes a first lens group G 1 with positive optical power and a second lens group G 2 with negative optical power, which are sequentially arranged from an object side to an image side, the first lens group G 1 includes a front lens group G f with positive optical power, an aperture stop, and a rear lens group G b with positive optical power, which are sequentially arranged from the object side to the image side, and the first lens group G 1 moves along an optical axis during focusing, and the second lens group G 2 is fixed relative to the image plane and satisfies the following conditions:
Wherein f 1 is the focal length of the first lens group G 1, f 2 is the focal length of the second lens group G 2, f a is the focal length of the front lens group G f, and f b is the focal length of the rear lens group G b.
The light sequentially passes through the first lens group G 1 and the second lens group G 2 to reach an image surface, the first lens group G 1 is a focusing group, the second lens group G 2 is a fixed group, focusing is realized by moving the first lens group G 1 along an optical axis, the focal power and focal length ratio range of the first lens group G 1 and the second lens group G 2 are limited, in the focal length ratio range of the first lens group G 1 and the second lens group G 2, good imaging performance can be maintained in a wide working distance between imaging multiplying power 0.04-0.4 by reasonably selecting the focal power and focal length ratio range of the front lens group G f and the rear lens group G b, so that the lens has a large target surface, simultaneously meets the requirement of high pixels, full-picture imaging is realized, the target surface angle line can reach 46mm, and the resolution reaches one hundred million pixels.
If the upper limit of the focal length ratio of the first lens group G 1 to the second lens group G 2 is exceeded in the conditional expression, the optical power of the second lens group G 2 relative to the first lens group G 1 is too low to correct the spherical aberration, coma aberration and other aberrations introduced by the first lens group G 1, resulting in performance degradation; if the lower limit of the focal length ratio of the first lens group G 1 to the second lens group G 2 is exceeded in the conditional expression, the focal power of the second lens group G 2 relative to the first lens group G 1 is too large, which causes excessive correction of aberrations such as spherical aberration and coma aberration, and the imaging quality is reduced.
If the upper limit of the focal length ratio of the front lens group G f and the rear lens group G b is exceeded in the condition, the focal power of the rear lens group G b is too small, and aberration correction cannot be performed on the front lens group G f, so that the introduced spherical aberration, coma aberration and other aberrations are too large, and the imaging performance is reduced; if the lower limit of the focal length ratio of the front lens group G f and the rear lens group G b is exceeded in the conditional expression, the optical power of the rear lens group G b becomes excessively large, causing excessive correction of aberrations and degradation of imaging performance.
In an embodiment, the front lens group G f includes a first lens L 11 having negative optical power, the first lens L 11 is a biconcave lens, and the following conditions are satisfied:
Wherein R 1 is the object-side radius of curvature of the first lens element L 11, f is the focal length of the lens element, TTL is the total optical length of the lens element, ω is the half field angle of the lens element, and D is the maximum effective radius of the first lens element L 11.
The distortion aberration can be effectively corrected by controlling the object-side curvature radius of the object-side first lens in the front lens group G f, the total optical length can be effectively shortened by controlling the lens shape of the object-side first lens in the first lens group G 1, and the miniaturization of the lens can be achieved while realizing large-target imaging. If the lower limit of the object side surface curvature radius and the lens focal length ratio of the first lens L 11 is exceeded, the curvature radius is too small, the focal power is too large, so that the introduced spherical aberration, the coma aberration and other aberrations are too large, and the imaging performance is reduced; if the upper limit of the object-side surface curvature radius and the lens focal length ratio of the first lens L 11 is exceeded, the curvature radius is too large, the focal power is too small, and enough negative aberration correction cannot be introduced, so that the lens distortion is large, and the imaging quality is affected. The ratio range among the optical total length, the optical caliber of the first lens and the angle of view is limited, so that the optical total length of the lens can be effectively shortened, the weight of the lens is reduced, and the requirement of a large target surface of the lens is further met.
In summary, when the above conditional expression is satisfied, it is beneficial to improve the resolution of the lens, improve the image quality, and reduce distortion, so that the lens can realize high-quality imaging and simultaneously satisfy the requirements of large target surface and high pixel.
In an embodiment, the front lens group G f further includes a second lens L 12 having positive optical power, a third lens L 13 having positive optical power, a fourth lens L 14 and a fifth lens L 15, and the first lens L 11, the second lens L 12, the third lens L 13, the fourth lens L 14 and the fifth lens L 15 are disposed in order from an object side to an image side.
In an embodiment, the second lens L 12 and the third lens L 13 are both biconvex lenses, the fourth lens L 14 is a cemented lens or a biconvex lens, and the fifth lens L 15 is a meniscus lens. When the fourth lens L 14 is a cemented lens, for example, the fourth lens L 14 is a negative focal power, and is formed by sequentially cemented lens with negative focal power and biconcave lens with negative focal power from the object side to the image side, or is adjusted according to the actual requirement.
In an embodiment, the rear lens group G b includes a sixth lens L 21 having negative optical power, the sixth lens L 21 includes a fifteenth lens L p having positive optical power and a sixteenth lens L m having negative optical power, which are cemented in order from an object side to an image side, and the following condition is satisfied:
ndm≥1.90,υdm≤26,υdp≥55
Where n dm is the d-line refractive index of the sixteenth lens L m, v dm is the abbe number of the sixteenth lens L m, and v dp is the abbe number of the fifteenth lens L p.
The refractive index and abbe number of the glass material of the sixteenth lens L m in the object side first lens cemented lens L 21 and the abbe number of the fifteenth lens L p in the rear lens group G b are set by reasonably distributing the optical power, and the first lens is made of a material with high refractive index, so that the introduction of spherical aberration and coma aberration can be reduced while the negative optical power is increased, and meanwhile, the chromatic aberration correction can be performed by cementing with an optical material with low dispersion, the secondary spectrum is reduced, the position chromatic aberration and the chromatic aberration of magnification of an optical system can be controlled, and high-quality imaging can be realized while the large target surface is met. If the lower limit of the refractive index of the glass material of the sixteenth lens L m is exceeded, the optical power of the sixteenth lens L m is insufficient, and the chromatic aberration of magnification shifts in the positive direction, resulting in excessive insufficient chromatic aberration of magnification and low peripheral imaging performance. If the upper limit of the abbe number of the glass material of the sixteenth lens L m is exceeded, the dispersion of the material of the sixteenth lens L m is too small, which results in insufficient correction of positional chromatic aberration and low center imaging performance. If the lower limit of the abbe number of the glass material of the fifteenth lens L p is exceeded, the chromatic dispersion of the material of the fifteenth lens L p becomes excessive, and the correction of positional chromatic aberration becomes excessive, and the center imaging performance becomes low.
In an embodiment, the rear lens group G b further includes a seventh lens L 22 having positive optical power and an eighth lens L 23 having positive optical power, and the sixth lens L 21, the seventh lens L 22, and the eighth lens L 23 are disposed in order from the object side to the image side.
In an embodiment, the seventh lens L 22 is a meniscus lens and the eighth lens L 23 is a biconvex lens or a meniscus lens.
The seventh lens L 22 and the eighth lens L 23 are mainly used to compensate the curvature of field and astigmatism introduced by the sixth lens L 21, and are both configured to have positive power to achieve focal plane uniformity.
In an embodiment, the rear lens group G b further includes a ninth lens L 24 and a tenth lens L 25 having positive and negative optical powers, the sixth lens L 21, the seventh lens L 22, the eighth lens L 23, the ninth lens L 24 and the tenth lens L 25 are sequentially disposed from the object side to the image side, the seventh lens L 22 is a biconvex lens or a meniscus lens, the eighth lens L 23 is a biconvex lens, and the ninth lens L 24 and the tenth lens L 25 are biconcave lenses or biconvex lenses.
The ninth lens L 24 and the tenth lens L 25 have positive and negative optical powers, and can effectively correct residual chromatic aberration of the first lens group G 1 by mutual compensation, so as to realize no chromatic aberration in the first lens group G 1.
In an embodiment, the second lens group G 2 includes an eleventh lens L 31 with positive power and a twelfth lens L 32 with negative power, which are disposed in order from the object side to the image side, the eleventh lens L 31 is a meniscus lens, and the twelfth lens L 32 is a concave flat lens.
In an embodiment, the second lens group G 2 further includes a thirteenth lens L 33 having positive optical power and a fourteenth lens L 34 having negative optical power, the eleventh lens L 31, the twelfth lens L 32, the thirteenth lens L 33 and the fourteenth lens L 34 are sequentially disposed from the object side to the image side, the eleventh lens L 31 is a biconvex lens, the twelfth lens L 32 is a biconcave lens, and the thirteenth lens L 33 and the fourteenth lens L 34 are meniscus lenses.
The twelfth lens L 32 mainly plays a role in reducing field curvature and astigmatism, and the eleventh lens L 31 can eliminate chromatic aberration introduced by the twelfth lens L 32, and optimize the surface shape of the twelfth lens L 32 to reduce ghosting.
In order to illustrate the application in more detail, several examples are described below.
Example 1:
As shown in fig. 1 to 5, in this embodiment, L 11 is a biconcave negative lens, L 12 is a biconvex positive lens, L 13 is a biconvex positive lens, L 14 is a negative cemented lens, L 15 is a positive meniscus lens, L 21 is a negative cemented lens, L 22 is a positive meniscus lens, L 23 is a biconvex positive lens, L 31 is a positive meniscus lens, and L 32 is a concave plano negative lens. And satisfies the following conditions:
ndm＝1.92;vdm＝24.93;vdp＝80.27。
specifically, the optical parameters of each lens are shown in table 1 below:
TABLE 1
In table 1, S i is a surface number, a radius, i.e., a radius of curvature, a thickness is an on-axis surface distance between the i-th surface and the i+1th surface, nd is a refractive index, vd is an abbe number, INF is a plane, D (0) is a working distance, i.e., an on-axis distance between the object plane and an apex of the object plane side of the first lens L 11, and D (1) is an on-axis distance between apexes of adjacent planes of the first lens group G 1 and the second lens group G 2. In the column where the surface number S i is located, 0 denotes an object plane, 25 denotes an image plane, IMG denotes an image plane, and the surface numbers 1 to 24 are the surfaces of each lens, aperture stop ST, and Cover glass from the object plane to the image plane in order, and it is to be noted that the cemented surfaces of different lenses in the cemented lens are represented as the same surface.
The optical parameters of the lenses are shown in table 2 below:
TABLE 2
In table 2, RED is the magnification, ω is the half field angle, WD is the standard working distance, far is the farthest working distance, and Near is the nearest working distance.
According to the data, the half field angle of the embodiment is 21.83 degrees at the standard working distance, the total optical length is 100mm, and high-quality imaging of the phi 43mm target surface is realized. As shown in fig. 2, the spherical aberration is controlled within 0.1mm, the astigmatism and the field curvature are controlled within 0.1mm, the optical distortion is less than 5%, and the requirements of various parameters of the large-target industrial lens are met. As shown in figures 3-5, F1-F5 in each figure sequentially correspond to the abbreviations of image heights Y' =0mm, 10.82mm,17.15mm,19.47mm,21.633mm, T and R respectively represent the tangent and Radial directions, when working distances are 500mm, 1000mm and 250mm respectively, the total image height MTF in the figure is more than 0.1@80lp/mm, the imaging requirements of high pixels, large target surfaces and wide working distances are met, and the imaging quality is high.
Example 2:
As shown in fig. 6 to 10, in this embodiment, L 11 is a biconcave negative lens, L 12 is a biconvex positive lens, L 13 is a biconvex positive lens, L 14 is a negative cemented lens, L 15 is a positive meniscus lens, L 21 is a negative cemented lens, L 22 is a positive meniscus lens, L 23 is a positive meniscus lens, L 31 is a biconvex positive lens, L 32 is a biconcave negative lens, L 33 is a positive meniscus lens, and L 34 is a negative meniscus lens. And satisfies the following conditions:
ndm＝1.92;υdm＝24.30;υdp＝73.25。
specifically, the optical parameters of each lens are shown in table 3 below:
TABLE 3 Table 3
In table 3, S i is a surface number, a radius, that is, a radius of curvature, a thickness is an on-axis surface distance between the i-th surface and the i+1th surface, nd is a refractive index, vd is an abbe number, INF is a plane, D (0) is a working distance, that is, an on-axis distance between the object plane and an apex of the object plane side of the first lens L 11, and D (1) is an on-axis distance between apexes of adjacent planes of the first lens group G 1 and the second lens group G 2. In the column where the surface number S i is located, 0 denotes an object plane, 29 denotes an image plane, IMG denotes an image plane, and the surface numbers 1 to 28 are the surfaces of each lens, aperture stop ST, cover glass from the object plane to the image plane in order, and it should be noted that the cemented surfaces of different lenses in the cemented lens are represented as the same surface.
The optical parameters of the lenses are shown in table 4 below:
TABLE 4 Table 4
In table 4, RED is the magnification, ω is the half field angle, WD is the standard working distance, far is the farthest working distance, and Near is the nearest working distance.
According to the data, the half field angle of the embodiment is 22.12 degrees at the standard working distance, the total optical length is 100mm, and high-quality imaging of the phi 43mm target surface is realized. As shown in FIG. 7, the spherical aberration is controlled within 0.1mm, the astigmatism and the field curvature are controlled within 0.1mm, the optical distortion is less than 5%, and the requirements of various parameters of the large-target industrial lens are met. As shown in figures 8-10, F1-F5 in each figure sequentially correspond to the abbreviations of image heights Y' =0mm, 10.82mm,17.15mm,19.47mm,21.633mm, T and R respectively represent the tangent and Radial directions, when working distances are 500mm, 1000mm and 250mm respectively, the total image height MTF in the figure is more than 0.3@100lp/mm, the imaging requirements of high pixels, large target surfaces and wide working distances are met, and the imaging quality is high.
Example 3:
As shown in fig. 11 to 15, in this embodiment, L 11 is a biconcave negative lens, L 12 is a biconvex positive lens, L 13 is a biconvex positive lens, L 14 is a biconvex positive lens, L 15 is a negative meniscus lens, L 21 is a negative cemented lens, L 22 is a biconvex positive lens, L 23 is a biconvex positive lens, L 24 is a biconcave negative lens, L 25 is a biconvex positive lens, L 31 is a positive meniscus lens, and L 32 is a concave-flat negative lens. And satisfies the following conditions:
ndm＝2.01;vdm＝25.43;vdp＝60.79。
Specifically, the optical parameters of each lens are shown in table 5 below:
TABLE 5
In table 5, S i is a surface number, a radius, that is, a radius of curvature, a thickness is an on-axis surface distance between the i-th surface and the i+1th surface, nd is a refractive index, vd is an abbe number, INF is a plane, D (0) is a working distance, that is, an on-axis distance between the object plane and an apex of the object plane side of the first lens L 11, and D (1) is an on-axis distance between adjacent apexes of the surfaces of the first lens group G 1 and the second lens group G 2. In the column where the surface number S i is located, 0 denotes an object plane, 28 denotes an image plane, IMG denotes an image plane, and the surface numbers 1 to 27 are the surfaces of each lens, aperture stop ST, and Cover glass from the object plane to the image plane in order, and it is to be noted that the cemented surfaces of different lenses in the cemented lens are represented as the same surface.
The optical parameters of the lenses are shown in table 6 below:
TABLE 6
In table 6, RED is the magnification, ω is the half field angle, WD is the standard working distance, far is the farthest working distance, and Near is the nearest working distance.
According to the data, the half field angle of the embodiment is 23.02 degrees at the standard working distance, the optical total length is 112.66mm, and high-quality imaging of the phi 46mm target surface is realized. As shown in FIG. 12, the spherical aberration is controlled within 0.1mm, the astigmatism and the field curvature are controlled within 0.1mm, the optical distortion is less than 5%, and the requirements of various parameters of the large-target industrial lens are met. As shown in fig. 13-15, in each figure, F1-F5 sequentially corresponds to image heights Y' =0 mm,11.5mm,16.1mm,20.7mm,23mm, T and R respectively represent abbreviations of the Tangential direction and the Radial direction, when working distances are 500mm, 1000mm and 150mm respectively, the total image height MTF in the figure is more than 0.3@120lp/mm, the imaging requirements of high pixels, large target surfaces and wide working distances are met, and the imaging quality is high.
Example 4:
As shown in fig. 16 to 20, in this embodiment, L 11 is a biconcave negative lens, L 12 is a biconvex positive lens, L 13 is a biconvex positive lens, L 14 is a biconvex positive lens, L 15 is a negative meniscus lens, L 21 is a negative cemented lens, L 22 is a positive meniscus lens, L 23 is a biconvex positive lens, L 24 is a biconvex positive lens, L 25 is a biconcave negative lens, L 31 is a positive meniscus lens, and L 32 is a concave plano negative lens. And satisfies the following conditions:
ndm＝1.99;vdm＝22.72;vdp＝58.63。
Specifically, the optical parameters of each lens are shown in table 7 below:
TABLE 7
| Si | Name of the name | Radius of radius | Thickness of (L) | nd | vd | Effective radius |
| 0 | D(0) | |||||
| 1 | L11 | -63.50 | 1.9 | 1.7184 | 24.29 | 18.90 |
| 2 | 37.12 | 3.2 | 17.96 | |||
| 3 | L12 | 75.92 | 7.0 | 1.9583 | 17.94 | 18.17 |
| 4 | -188.87 | 1.5 | 18.16 | |||
| 5 | L13 | 42.24 | 6.3 | 1.7584 | 52.34 | 17.55 |
| 6 | -148.78 | 3.9 | 17.18 | |||
| 7 | L14 | 20.04 | 5.5 | 1.5122 | 68.17 | 10.15 |
| 8 | -427.09 | 0.2 | 10.84 | |||
| 9 | L15 | 99.94 | 0.8 | 1.54792 | 49.1 | 9.59 |
| 10 | 14.19 | 6.5 | 8.04 | |||
| 11 | ST | INF | 5.6 | 7.91 | ||
| 12 | L21 | -21.47 | 3.9 | 1.55295 | 58.63 | 8.55 |
| 13 | -11.17 | 0.8 | 1.99462 | 22.72 | 8.40 | |
| 14 | -68.89 | 1.6 | 10.56 | |||
| 15 | L22 | -179.64 | 6.8 | 1.70482 | 55.78 | 13.32 |
| 16 | -20.26 | 0.2 | 14.23 | |||
| 17 | L23 | 3977.08 | 5.9 | 1.9583 | 17.94 | 16.57 |
| 18 | -50.97 | 0.2 | 17.11 | |||
| 19 | L24 | 75.68 | 5.6 | 1.9583 | 17.94 | 17.24 |
| 20 | -71.28 | 0.9 | 17.09 | |||
| 21 | L25 | -51.84 | 1.7 | 1.95831 | 17.94 | 17.04 |
| 22 | 61.17 | D(1) | 16.74 | |||
| 23 | L31 | -1536.67 | 4.2 | 1.93283 | 28.84 | 18.26 |
| 24 | -61.21 | 4.8 | 18.37 | |||
| 25 | L32 | -44.47 | 1.9 | 2.00988 | 25.43 | 17.81 |
| 26 | -199.11 | 19.0 | 18.50 | |||
| 27 | Cover | INF | 2 | 1.51872 | 64.2 | 22.53 |
| 28 | IMG | INF | 1 | 22.79 |
In table 7, S i is a surface number, a radius, i.e., a radius of curvature, a thickness is an on-axis surface distance between the i-th surface and the i+1th surface, nd is a refractive index, vd is an abbe number, INF is a plane, D (0) is a working distance, i.e., an on-axis distance between the object plane and an apex of the object plane side of the first lens L 11, and D (1) is an on-axis distance between apexes of adjacent planes of the first lens group G 1 and the second lens group G 2. In the column where the surface number S i is located, 0 denotes an object plane, 28 denotes an image plane, IMG denotes an image plane, and the surface numbers 1 to 27 are the surfaces of each lens, aperture stop ST, and Cover glass from the object plane to the image plane in order, and it is to be noted that the cemented surfaces of different lenses in the cemented lens are represented as the same surface.
The optical parameters of the lenses are shown in table 8 below:
TABLE 8
In table 8, RED is the magnification, ω is the half field angle, WD is the standard working distance, far is the farthest working distance, and Near is the nearest working distance.
According to the data, the half field angle of the embodiment is 23.06 degrees at the standard working distance, the optical total length is 110.92mm, and the high-quality imaging of the phi 46mm target surface is realized. As shown in fig. 17, the spherical aberration is controlled within 0.1mm, the astigmatism and the field curvature are controlled within 0.1mm, and the optical distortion is less than 5%; meets the requirements of various parameters of the large target industrial lens. As shown in figures 18-20, F1-F5 in each figure sequentially correspond to the image heights Y' =0 mm,11.5mm,16.1mm,20.7mm,23mm, T and R respectively represent abbreviations of the Tangential direction and the Radial direction, when working distances are 500mm, 1000mm and 150mm respectively, the total image height MTF in the figure is more than 0.3@100lp/mm, the imaging requirements of high pixels, large target surfaces and wide working distances are met, and the imaging quality is high.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above-described embodiments represent only the more specific and detailed embodiments of the present application, but are not to be construed as limiting the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The utility model provides a big target surface camera lens of high pixel which characterized in that: the high-pixel large-target-surface lens consists of a first lens group G 1 with positive focal power and a second lens group G 2 with negative focal power, which are sequentially arranged from an object side to an image side, wherein the first lens group G 1 consists of a front lens group G f with positive focal power, an aperture diaphragm and a rear lens group G b with positive focal power, which are sequentially arranged from the object side to the image side, and the first lens group G 1 moves along an optical axis during focusing, and the second lens group G 2 is fixed relative to an image plane and meets the following conditions:
Wherein f 1 is the focal length of the first lens group G 1, f 2 is the focal length of the second lens group G 2, f a is the focal length of the front lens group G f, and f b is the focal length of the rear lens group G b;
The front lens group G f includes a first lens L 11 having negative optical power, a second lens L 12 having positive optical power, a third lens L 13 having positive optical power, a fourth lens L 14, and a fifth lens L 15, which are sequentially disposed from an object side to an image side;
The rear lens group G b includes a sixth lens L 21 having negative optical power, a seventh lens L 22 having positive optical power, and an eighth lens L 23 having positive optical power, which are sequentially disposed from an object side to an image side;
The second lens group G 2 includes an eleventh lens L 31 having positive optical power and a twelfth lens L 32 having negative optical power, which are disposed in order from the object side to the image side.
2. The high pixel large target lens of claim 1, wherein: the first lens L 11 is a biconcave lens, and satisfies the following conditions:
Wherein R 1 is the object-side radius of curvature of the first lens L 11, f is the focal length of the lens, TTL is the total optical length of the lens, ω is the half field angle of the lens, and D is the maximum effective radius of the first lens L 11.
3. The high-pixel large-target-surface lens of claim 2, wherein: the second lens L 12 and the third lens L 13 are both biconvex lenses, the fourth lens L 14 is a cemented lens or a biconvex lens, and the fifth lens L 15 is a meniscus lens.
4. The high pixel large target lens of claim 1, wherein: the sixth lens L 21 is composed of a fifteenth lens L p having positive optical power and a sixteenth lens L m having negative optical power, which are sequentially arranged from an object side to an image side, and satisfies the following conditions:
ndm≥1.90,υdm≤26,υdp≥55
Wherein n dm is the d-line refractive index of the sixteenth lens L m, v dm is the abbe number of the sixteenth lens L m, and v dp is the abbe number of the fifteenth lens L p.
5. The high-pixel large-target-surface lens of claim 4, wherein: the seventh lens L 22 is a meniscus lens, and the eighth lens L 23 is a biconvex lens or a meniscus lens.
6. The high-pixel large-target-surface lens of claim 4, wherein: the rear lens group G b further includes a ninth lens L 24 and a tenth lens L 25, which have positive and negative focal powers, wherein the sixth lens L 21, the seventh lens L 22, the eighth lens L 23, the ninth lens L 24 and the tenth lens L 25 are sequentially disposed from an object side to an image side, the seventh lens L 22 is a biconvex lens or a meniscus lens, the eighth lens L 23 is a biconvex lens, and the ninth lens L 24 and the tenth lens L 25 are biconcave lenses or biconvex lenses.
7. The high pixel large target lens of claim 1, wherein: the eleventh lens L 31 is a meniscus lens, and the twelfth lens L 32 is a concave flat lens.
8. The high-pixel large-target-surface lens of claim 7, wherein: the second lens group G 2 further includes a thirteenth lens L 33 having positive optical power and a fourteenth lens L 34 having negative optical power, where the eleventh lens L 31, the twelfth lens L 32, the thirteenth lens L 33 and the fourteenth lens L 34 are sequentially disposed from an object side to an image side, the eleventh lens L 31 is a biconvex lens, the twelfth lens L 32 is a biconcave lens, and the thirteenth lens L 33 and the fourteenth lens L 34 are both meniscus lenses.
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| CN215867319U (en) * | 2021-09-26 | 2022-02-18 | 江西凤凰光学科技有限公司 | High-pixel large-target-surface lens |
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| FR1516612A (en) * | 1966-04-05 | 1968-03-08 | Schneider Co Optische Werke | High brightness varifocal lens |
| AT323441B (en) * | 1973-12-20 | 1975-07-10 | Eumig | PANRATIC LENS |
| JP2014021340A (en) * | 2012-07-19 | 2014-02-03 | Ricoh Co Ltd | Image forming lens, imaging lens unit, and imaging apparatus |
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