CN113703144A - High-pixel large-target-surface lens - Google Patents
High-pixel large-target-surface lens Download PDFInfo
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- 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
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- 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 and a second lens group, wherein the first lens group and the second lens group are sequentially arranged from an object side to an image side and have positive focal power, the first lens group comprises a front lens group, an aperture diaphragm and a rear lens group, the front lens group and the aperture diaphragm are sequentially arranged from the object side to the image side and have 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 of an image, reduce distortion, realize full-picture imaging and small and light weight, and meet the imaging performance of a large target surface and high pixels 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 and the curvature radius of the object side surface of the first lens in the front lens group.
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 demand of large-scale manufacturing industry, particularly the fields of LCD panel detection, printed products, grain screening, tobacco foreign matter removal and the like, has the characteristics of wide breadth, high speed, high precision and the like, and is increasing continuously.
However, the optical magnification and imaging frame of the lens in the prior art are small, and the lens cannot be matched with a large-target-surface photoreceptor, especially, the lens has low resolution, large distortion, poor color and contrast and is deficient in short-distance imaging in industrial application, and correspondingly higher requirements on the imaging quality of the lens are provided along with the continuous improvement of detection precision, and the existing lens is limited in some fields with higher imaging quality requirements. Therefore, the development of high-resolution and large-target industrial lens is more urgent.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a high-pixel large-target lens that can improve the resolution of the lens, improve the image quality, reduce distortion, maintain good imaging performance in a wide working distance, realize full-frame imaging and small and light weight, and satisfy the imaging performance of large target and high pixels.
In order to achieve the 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 with positive focal power, which is arranged from an object side to an image side in sequence1And a second lens group G having negative refractive power2First lens group G1Comprises a front lens group G with positive focal power arranged from an object side to an image side in sequencefAn aperture stop and a rear lens group G with positive focal powerbWhen focusing, the first lens group G1Moving along the optical axis, the second lens group G2The relative image surface is fixed, and the following conditions are met:
wherein f is1Is a first lens group G1Focal length of (f)2Is a second lens group G2Focal length of (f)aIs a front lens group GfFocal length of (f)bIs a rear lens group GbThe focal length of (c).
Preferably, the front lens group GfComprising a first lens L having a negative optical power11First lens L11Is a biconcave lens and satisfies the following conditions:
wherein R is1Is the first lens L11F is the focal length of the lens, TTL is the total optical length of the lens, omega is the half field angle of the lens, and D is the first lens L11The maximum effective radius of.
Preferably, the front lens group GfAnd a second lens L with positive focal power12A third lens L having a positive refractive power13A fourth lens element L14And a fifth lens L15First lens L11A second lens element L12A third lens element L13A fourth lens element L14And a fifth lens L15Arranged from the object side to the image side in sequence.
Preferably, the second lens L12And a third lens L13Are all biconvex lenses, the fourth lens L14A cemented lens or a biconvex lens, a fifth lens L15Is a meniscus lens.
Preferably, the rear lens group GbComprising a sixth lens L having a negative optical power21Sixth lens element L21Comprises a fifteenth lens L with positive focal power arranged from the object side to the image sidepAnd a sixteenth lens L having a negative powermGluing the components, and satisfying the following conditions:
ndm≥1.90，υdm≤26，υdp≥55
wherein n isdmIs a sixteenth lens LmD-line refractive index, vdmIs a sixteenth lens LmAbbe number, upsilon ofdpIs the fifteenth lens LpAbbe number of (2).
Preferably, the rear lens group GbFurther comprises a seventh lens L with positive focal power22And an eighth lens L having positive optical power23Sixth lens element L21The seventh lens element L22And an eighth lens L23Arranged from the object side to the image side in sequence.
Preferably, the seventh lens L22Is a meniscus lens, an eighth lens L23Is a biconvex lens or a meniscus lens.
Preferably, the rear lens group GbAnd a ninth lens L with positive and negative focal powers24And a tenth lens L25Sixth lens element L21The seventh lens element L22The eighth lens element L23The ninth lens element L24And a tenth lens L25A seventh lens element L arranged from the object side to the image side22Being a biconvex lens or a meniscus lens, an eighth lens L23Being a biconvex lens, a ninth lens L24And a tenth lens L25Is a biconcave lens or a biconvex lens.
Preferably, the second lens group G2Comprises an eleventh lens L with positive focal power arranged from the object side to the image side31And a twelfth lens L having a negative power32Eleventh lens L31Is a meniscus lens, a twelfth lens L32Is a concave flat lens.
Preferably, the second lens group G2Further comprises a thirteenth lens L with positive focal power33And a fourteenth lens L having a negative refractive power34Eleventh lens L31Twelfth lens element L32Thirteenth lens element L33And a fourteenth lens L34An eleventh lens L arranged from the object side to the image side31Being a biconvex lens, a twelfth lens L32Is a biconcave lens, a thirteenth lens L33And a fourteenth lens L34Are both meniscus lenses.
Compared with the prior art, the invention has the beneficial effects that:
1) the lens realizes focusing by moving the first lens group along an optical axis, and limits 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, thereby improving the resolution of the lens, improving the image quality of an image, reducing distortion, and maintaining good imaging performance in a wide working distance, so that the lens has a large target surface and simultaneously meets the requirement of high pixels, full-frame imaging is realized, the diagonal of the target surface is 46mm, and the resolution reaches one hundred million pixels;
2) by controlling the lens shape and the curvature radius of the object side surface of the object side head lens in the front lens group and limiting the ratio of the optical total length of the lens, the optical aperture of the head lens and the field angle, the distortion aberration can be effectively corrected, the optical total length can be shortened, the weight of the lens can be reduced, and the small and light lens can be realized while the large target surface imaging is realized;
3) through reasonable distribution of focal power, setting of the refractive index and Abbe number of materials of a first object lens in the rear lens group, selection of a material with high refractive index for the first lens, the introduction of spherical aberration and coma aberration can be reduced while negative focal power is increased, and meanwhile, through gluing with an optical material with low dispersion, chromatic aberration correction can be performed, secondary spectrum is reduced, the position chromatic aberration and the magnification chromatic aberration of an optical system can be controlled, and high-quality imaging is achieved while a 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 diagram of aberrations for a work object distance of 500mm, in accordance with an embodiment of the present invention;
FIG. 3 is a graph of MTF at a work object distance of 500mm according to an embodiment of the present invention;
FIG. 4 is a graph of MTF at a work object distance of 1000mm according to an embodiment of the present invention;
FIG. 5 is a graph of MTF at a work object distance of 250mm according to an embodiment of the present invention;
FIG. 6 is a schematic view of a second lens structure according to an embodiment of the present invention;
FIG. 7 is a diagram of aberrations for a second embodiment of the present invention when the object distance is 500 mm;
FIG. 8 is a graph of MTF at a distance of 500mm for a second working object according to an embodiment of the present invention;
FIG. 9 is a graph of MTF at a working object distance of 1000mm according to a second embodiment of the present invention;
FIG. 10 is a graph of MTF at a working object distance of 250mm according to a second embodiment of the present invention;
FIG. 11 is a schematic diagram of a three-lens structure according to an embodiment of the present invention;
FIG. 12 is a chart of aberrations for a three-work object distance of 500mm in accordance with an embodiment of the present invention;
FIG. 13 is a graph of MTF at a distance of 500mm for a three working objects according to an embodiment of the present invention;
FIG. 14 is a graph of MTF at 1000mm for a three-working object distance in accordance with an embodiment of the present invention;
FIG. 15 is a graph of MTF at 150mm distance for a three-working object according to an embodiment of the present invention;
FIG. 16 is a schematic diagram of a four-lens structure according to an embodiment of the present invention;
FIG. 17 is a graph of aberrations for an example of the present invention with a distance of 500mm between four work products;
FIG. 18 is a graph of MTF at 500mm spacing for a quadruplex work plant according to an embodiment of the present invention;
FIG. 19 is a graph of MTF at a distance of 1000mm for a quadruplex work plant according to an embodiment of the present invention;
FIG. 20 is a graph of MTF at 150mm spacing for crops according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any 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 in the description of the present application herein 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 with positive power arranged from an object side to an image side1And a second lens group G having negative refractive power2First lens group G1Comprises a front lens group G with positive focal power arranged from an object side to an image side in sequencefAn aperture stop and a rear lens group G with positive focal powerbWhen focusing, the first lens group G1Moving along the optical axis, the second lens group G2The relative image surface is fixed, and the following conditions are met:
wherein f is1Is a first lens group G1Focal length of (f)2Is a second lens group G2Focal length of (f)aIs a front lens group GfFocal length of (f)bIs a rear lens group GbThe focal length of (c).
Wherein, the light rays pass through the first lens group G in sequence1And a second lens group G2To the image plane, the first lens group G1For focusing group, the second lens group G2For a fixed group, pass through the first lens group G1Moving along the optical axis to realize focusing and defining a first lens group G1And a second lens group G2And in the first lens group G1And a second lens group G2Within the range of focal length ratio, by reasonably selecting the front lens group GfAnd a rear lens group GbThe focal power and focal length ratio range of the lens can maintain good imaging performance in a wide working distance with imaging multiplying power of 0.04-0.4, so that the lens has a large target surface, simultaneously meets the requirement of high pixels, realizes full-picture imaging, the diagonal of the target surface can reach 46mm, and the resolution reaches one hundred million pixels.
If the first lens group G exceeds the condition1And second pass throughLens group G2Upper limit of focal length ratio of the second lens group G2Relative to the first lens group G1Too low focal power to correct the first lens group G1The introduced various aberrations such as spherical aberration, coma aberration and the like cause performance reduction; if the first lens group G exceeds the condition1And a second lens group G2Lower limit of focal length ratio, the second lens group G2Relative to the first lens group G1The focal power of (2) is too large, which causes excessive correction of various aberrations such as spherical aberration and coma aberration, and the imaging quality is reduced.
If out of condition, the middle front lens group GfAnd a rear lens group GbUpper limit of focal length ratio of (1), the rear lens group GbToo small focal power of (A) to the front lens group GfAberration correction is carried out, so that introduced spherical aberration, coma aberration and other aberrations are too large, and the imaging performance is reduced; if the condition is exceeded, the front middle lens group GfAnd a rear lens group GbLower limit of focal length ratio, the rear lens group GbThe focal power of (2) is too large, which causes over-correction of various aberrations and deterioration of imaging performance.
In one embodiment, the front lens group GfComprising a first lens L having a negative optical power11First lens L11Is a biconcave lens and satisfies the following conditions:
wherein R is1Is the first lens L11F is the focal length of the lens, TTL is the total optical length of the lens, omega is the half field angle of the lens, and D is the first lens L11The maximum effective radius of.
Wherein the front lens group G is controlledfThe curvature radius of the object side surface of the middle object side head lens can effectively correct distortion aberration, and the first lens group G is controlled1The lens shape of the middle object side first lens can effectively shorten the optical total length, and the miniaturization of the lens is achieved while the large target surface imaging is achieved. If it exceeds the first lens L11Object side curvature radius and lens focal length ratioThe lower limit of (3) is that the curvature radius is too small, the focal power is too large, the introduced spherical aberration, coma aberration and other aberrations are too large, and the imaging performance is reduced; if it exceeds the first lens L11The upper limit of the ratio of the object side curvature radius to the lens focal length is too large, the curvature radius is too small, the focal power is too small, and sufficient negative distortion aberration correction cannot be introduced, so that the lens distortion is large, and the imaging quality is influenced. By limiting the ratio range of the total optical length, the optical caliber of the first lens and the field angle, the total optical length of the lens can be effectively shortened, the weight of the lens can be reduced, and the requirement of a large target surface can be further met.
In summary, when the above conditional expressions are satisfied, it is beneficial to improve the resolution of the lens, improve the image quality, and reduce the distortion, so that the lens can realize high-quality imaging and satisfy the requirements of large target surface and high pixels.
In one embodiment, the front lens group GfAnd a second lens L with positive focal power12A third lens L having a positive refractive power13A fourth lens element L14And a fifth lens L15First lens L11A second lens element L12A third lens element L13A fourth lens element L14And a fifth lens L15Arranged from the object side to the image side in sequence.
In one embodiment, the second lens L12And a third lens L13Are all biconvex lenses, the fourth lens L14A cemented lens or a biconvex lens, a fifth lens L15Is a meniscus lens. Wherein the fourth lens L14In the case of a cemented lens, for example, the cemented lens is a negative power, and is formed by cementing a double convex lens with a negative power and a double concave lens with a negative power, which are arranged in order from the object side to the image side, or is adjusted according to actual requirements.
In one embodiment, the rear lens group GbComprising a sixth lens L having a negative optical power21Sixth lens element L21Comprises a fifteenth lens L with positive focal power arranged from the object side to the image sidepAnd a sixteenth lens L having a negative powermGluing the components, and satisfying the following conditions:
ndm≥1.90，υdm≤26，υdp≥55
wherein n isdmIs a sixteenth lens LmD-line refractive index, vdmIs a sixteenth lens LmAbbe number, upsilon ofdpIs the fifteenth lens LpAbbe number of (2).
Wherein the focal power is distributed reasonably, and the rear lens group G is setbMiddle object side first lens cemented lens L21Sixteenth lens L in (1)mRefractive index and Abbe number of the glass material, and a fifteenth lens LpThe Abbe number of the glass material is high in refractive index, so that the introduction of spherical aberration and coma aberration can be reduced while negative focal power is increased, and meanwhile, the glass material is glued with an optical material with low dispersion, so that chromatic aberration correction can be performed, secondary spectrum can be reduced, the position chromatic aberration and the magnification chromatic aberration of an optical system can be controlled, and high-quality imaging can be realized while a large target surface is met. If it exceeds the sixteenth lens LmWhen the refractive index of the glass material is lower than the lower limit, the sixteenth lens LmThe power of the imaging lens is insufficient, and the magnification chromatic aberration moves to the positive direction, so that the magnification chromatic aberration is excessively insufficient, and the peripheral imaging performance is low. If it exceeds the sixteenth lens LmWhen the glass material of (2) has an upper limit of Abbe number, the sixteenth lens LmThe chromatic dispersion of the material is too small, so that the correction of the position chromatic aberration is insufficient, and the central imaging performance is low. If it exceeds the fifteenth lens LpWhen the Abbe number of the glass material is lower than the above range, the fifteenth lens LpThe chromatic dispersion of the material is too large, so that the correction of the position chromatic aberration is excessive, and the central imaging performance is low.
In one embodiment, the rear lens group GbFurther comprises a seventh lens L with positive focal power22And an eighth lens L having positive optical power23Sixth lens element L21The seventh lens element L22And an eighth lens L23Arranged from the object side to the image side in sequence.
In one embodiment, the seventh lens L22Is a meniscus lens, an eighth lens L23Is a biconvex lens or a meniscus lens.
Wherein, the seventh transmission is adoptedMirror L22And an eighth lens L23Mainly for compensating the sixth lens L21The introduced curvature of field and astigmatism are configured to have positive optical power to achieve focal plane uniformity.
In one embodiment, the rear lens group GbAnd a ninth lens L with positive and negative focal powers24And a tenth lens L25Sixth lens element L21The seventh lens element L22The eighth lens element L23The ninth lens element L24And a tenth lens L25A seventh lens element L arranged from the object side to the image side22Being a biconvex lens or a meniscus lens, an eighth lens L23Being a biconvex lens, a ninth lens L24And a tenth lens L25Is a biconcave lens or a biconvex lens.
Wherein the ninth lens element L24And a tenth lens L25Positive and negative focal power, and the first lens group G can be effectively corrected by mutual compensation1To realize the first lens group G1No chromatic aberration within the cluster.
In one embodiment, the second lens group G2Comprises an eleventh lens L with positive focal power arranged from the object side to the image side31And a twelfth lens L having a negative power32Eleventh lens L31Is a meniscus lens, a twelfth lens L32Is a concave flat lens.
In one embodiment, the second lens group G2Further comprises a thirteenth lens L with positive focal power33And a fourteenth lens L having a negative refractive power34Eleventh lens L31Twelfth lens element L32Thirteenth lens element L33And a fourteenth lens L34An eleventh lens L arranged from the object side to the image side31Being a biconvex lens, a twelfth lens L32Is a biconcave lens, a thirteenth lens L33And a fourteenth lens L34Are both meniscus lenses.
Wherein the twelfth lens element L32The eleventh lens L mainly plays a role of reducing curvature of field and astigmatism31Eliminable twelfth lens L32The introduced chromatic aberration is the same asTime-to-twelfth lens L32Is optimized to reduce ghosting.
To illustrate the present application in more detail, the following description is given by way of a number of examples.
Example 1:
as shown in FIGS. 1-5, L in this embodiment11Is a biconcave negative lens, L12Is a biconvex positive lens, L13Is a biconvex positive lens, L14Is a negative cemented lens, L15Is a positive meniscus lens, L21Is a negative cemented lens, L22Is a positive meniscus lens, L23Is a biconvex positive lens, L31Is a positive meniscus lens, L32Is a concave flat negative lens. And the following conditions are satisfied:
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, SiSurface number, radius of curvature, thickness, on-axis surface distance between the ith surface and the (i + 1) th surface, nd refractive index, vd Abbe number, INF surface is a plane, and D (0) is the working distance, i.e., object plane, to the first lens L11The on-axis distance between the vertices of the object plane side, D (1) is the first lens group G1And a second lens group G2The on-axis distance between the vertices of adjacent faces. Surface number SiIn the column, 0 denotes an object plane, 25 denotes an image plane, i.e., IMG, and surface numbers 1 to 24 are respective lenses from the object plane to the image plane in this orderThe surfaces of the aperture stop ST and the Cover glass Cover are the same surface as the cemented surface of the different lenses in the cemented lens.
The optical parameters of the lens 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 and the total optical length is 100mm at the standard working distance, 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 fig. 3-5, F1-F5 in each figure sequentially correspond to the abbreviations of image height Y' 0mm,10.82mm,17.15mm,19.47mm,21.633mm, and T, R respectively represent the abbreviations of the Tangential (Tangential) direction and the Radial (Radial) direction, and when the working distances are 500mm, 1000mm, and 250mm respectively, the full image height MTF in the figure is greater than 0.1@80lp/mm, so that the imaging requirements of high pixel, large target surface, and wide working distance are met, and the imaging quality is high.
Example 2:
as shown in FIGS. 6-10, L in this embodiment11Is a biconcave negative lens, L12Is a biconvex positive lens, L13Is a biconvex positive lens, L14Is a negative cemented lens, L15Is a positive meniscus lens, L21Is a negative cemented lens, L22Is a positive meniscus lens, L23Is a positive meniscus lens, L31Is a biconvex positive lens, L32Is a biconcave negative lens, L33Is a positive meniscus lens, L34Is a negative meniscus lens. And the following conditions are satisfied:
ndm＝1.92；υdm＝24.30；υdp＝73.25。
specifically, the optical parameters of each lens are shown in table 3 below:
TABLE 3
In Table 3, SiSurface number, radius of curvature, thickness, on-axis surface distance between the ith surface and the (i + 1) th surface, nd refractive index, vd Abbe number, INF surface is a plane, and D (0) is the working distance, i.e., object plane, to the first lens L11The on-axis distance between the vertices of the object plane side, D (1) is the first lens group G1And a second lens group G2The on-axis distance between the vertices of adjacent faces. Surface number SiIn the column, 0 denotes an object plane, 29 denotes an image plane, i.e., IMG denotes an image plane, and surface numbers 1 to 28 denote the surfaces of the respective lenses, the aperture stop ST, and the Cover glass Cover from the object plane to the image plane in this order, and it should be noted that the cemented surfaces of the different lenses in the cemented lens are denoted by the same surface.
The optical parameters of the lens are shown in table 4 below:
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 and the total optical length is 100mm at the standard working distance, 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 fig. 8-10, F1-F5 in each figure sequentially correspond to the abbreviations of image height Y' 0mm,10.82mm,17.15mm,19.47mm,21.633mm, and T, R respectively represent the abbreviations of the Tangential (Tangential) direction and the Radial (Radial) direction, and when the working distances are 500mm, 1000mm, and 250mm respectively, the full image height MTF in the figure is greater than 0.3@100lp/mm, so that the imaging requirements of high pixel, large target surface, and wide working distance are met, and the imaging quality is high.
Example 3:
as shown in FIGS. 11-15, L in this embodiment11Is a biconcave negative lens, L12Is a biconvex positive lens, L13Is a biconvex positive lens, L14Is a biconvex positive lens, L15Is a negative meniscus lens, L21Is a negative cemented lens, L22Is a biconvex positive lens, L23Is a biconvex positive lens, L24Is a biconcave negative lens, L25Is a biconvex positive lens, L31Is a positive meniscus lens, L32Is a concave flat negative lens. And the following conditions are satisfied:
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, SiSurface number, radius of curvature, thickness, on-axis surface distance between the ith surface and the (i + 1) th surface, nd refractive index, vd Abbe number, INF surface plane, and D (0) working distance, object planeTo the first lens L11The on-axis distance between the vertices of the object plane side, D (1) is the first lens group G1And a second lens group G2The on-axis distance between the vertices of adjacent faces. Surface number SiIn the column, 0 denotes an object plane, 28 denotes an image plane, i.e., IMG denotes an image plane, and surface numbers 1 to 27 denote the surfaces of the respective lenses, the aperture stop ST, and the Cover glass Cover from the object plane to the image plane in this order, and it should be noted that the cemented surfaces of the different lenses in the cemented lens are denoted by the same surface.
The optical parameters of the lens 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 and the total optical length is 112.66mm at the standard working distance, 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, and the optical distortion is less than 5%, so that the requirements of various parameters of the large-target industrial lens are met. As shown in fig. 13-15, F1-F5 in each figure sequentially correspond to the abbreviations of image height Y' 0mm,11.5mm,16.1mm,20.7mm,23mm, T, R respectively for the Tangential (Tangential) and Radial (Radial) directions, and when the working distances are 500mm, 1000mm and 150mm respectively, the full image height MTF >0.3@120lp/mm in the figure meets the imaging requirements of high pixel, large target surface and wide working distance, and the imaging quality is high.
Example 4:
as shown in FIGS. 16-20, L in this embodiment11Is a biconcave negative lens, L12Is a biconvex positive lens, L13Is a biconvex positive lens, L14Is a biconvex positive lens, L15Is a negative meniscus lens, L21Is a negative cemented lens, L22Is a positive meniscus lens, L23Is a biconvex positive lens, L24Is a biconvex positive lens, L25Is a pairConcave negative lens, L31Is a positive meniscus lens, L32Is a concave flat negative lens. And the following conditions are satisfied:
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 (R) | Radius of | Thickness of | 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 | | INF | 1 | 22.79 |
In Table 7, SiSurface number, radius of curvature, thickness, on-axis surface distance between the ith surface and the (i + 1) th surface, nd refractive index, vd Abbe number, INF surface is a plane, and D (0) is the working distance, i.e., object plane, to the first lens L11The on-axis distance between the vertices of the object plane side, D (1) is the first lens group G1And a second lens group G2The on-axis distance between the vertices of adjacent faces. Surface number SiIn the column, 0 denotes an object plane, 28 denotes an image plane, i.e., IMG denotes an image plane, and surface numbers 1 to 27 denote the surfaces of the respective lenses, the aperture stop ST, and the Cover glass Cover from the object plane to the image plane in this order, and it should be noted that the cemented surfaces of the different lenses in the cemented lens are denoted by the same surface.
The optical parameters of the lens 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 and the total optical length is 110.92mm at the standard working distance, and 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%; and various parameter requirements of the industrial lens with the large target surface are met. As shown in fig. 18-20, F1-F5 in each figure sequentially correspond to the abbreviations of image height Y' 0mm,11.5mm,16.1mm,20.7mm,23mm, T, R respectively for Tangential (Tangential) and Radial (Radial) directions, and when the working distance is 500mm, 1000mm and 150mm respectively, the full image height MTF >0.3@100lp/mm in the figure meets the imaging requirements of high pixel, large target surface and wide working distance, and the imaging quality is high.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express the more specific and detailed embodiments described in the present application, but not be construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high-pixel large-target-surface lens is characterized in that: the high-pixel large-target-surface lens comprises a first lens group G with positive focal power, which is arranged from an object side to an image side in sequence1And a second lens group G having negative refractive power2Said first lens group G1Comprises a front lens group G with positive focal power arranged from an object side to an image side in sequencefAn aperture stop and a rear lens group G with positive focal powerbWhen focusing, the first lens group G1Moving along the optical axis, the second lens group G2The relative image surface is fixed, and the following conditions are met:
wherein f is1Is the first lens group G1Focal length of (f)2Is the second lens group G2Focal length of (f)aIs the front lens group GfFocal length of (f)bIs the rear lens group GbThe focal length of (c).
2. The high-pixel large-target lens of claim 1, wherein: the front lens group GfComprising a first lens L having a negative optical power11The first lens L11Is a biconcave lens and satisfies the following conditions:
wherein R is1Is the first lens L11F is the focal length of the lens, TTL is the total optical length of the lens, omega is the half field angle of the lens, and D is the first lens L11The maximum effective radius of.
3. The high-pixel large-target lens of claim 2, wherein: the front lens group GfAnd a second lens L with positive focal power12A third lens L having a positive refractive power13A fourth lens element L14And a fifth lens L15The first lens L11A second lens element L12A third lens element L13A fourth lens element L14And a fifth lens L15Arranged from the object side to the image side in sequence.
4. The high-pixel large-target lens of claim 3, wherein: the second lens L12And a third lens L13Are each a biconvex lens, the fourth lens L14The fifth lens L is a cemented lens or a biconvex lens15Is a meniscus lens.
5. The high-pixel large-target lens of claim 1, wherein: the rear lens group GbComprising a sixth lens L having a negative optical power21The sixth lens L21Comprises a fifteenth lens L with positive focal power arranged from the object side to the image sidepAnd a sixteenth lens L having a negative powermGluing the components, and satisfying the following conditions:
ndm≥1.90，υdm≤26，υdp≥55
wherein n isdmIs the sixteenth lens LmD-line refractive index, vdmIs the sixteenth lens LmAbbe number, upsilon ofdpIs the fifteenth lens LpAbbe number of (2).
6. The high-pixel large-target lens of claim 5, wherein: the rear lens group GbFurther comprises a seventh lens L with positive focal power22And an eighth lens L having positive optical power23The sixth lens L21The seventh lens element L22And an eighth lens L23Arranged from the object side to the image side in sequence.
7. The high pixel large target lens of claim 6, wherein: the seventh lens L22Is a meniscus lens, the eighth lens L23Is a biconvex lens or a meniscus lens.
8. The high pixel large target lens of claim 6, wherein: the rear lens group GbAnd a ninth lens L with positive and negative focal powers24And a tenth lens L25The sixth lens L21The seventh lens element L22The eighth lens element L23The ninth lens element L24And a tenth lens L25The seventh lens element L is arranged from the object side to the image side in sequence22Is a biconvex lens or a meniscus lens, the eighth lens L23Being a biconvex lens, the ninth lens L24And a tenth lens L25Is a biconcave lens or a biconvex lens.
9. The high-pixel large-target lens of claim 1, wherein: the second lens group G2Comprises an eleventh lens L with positive focal power arranged from the object side to the image side31And a twelfth lens L having a negative power32The eleventh lens L31Is a meniscus lens, the twelfth lens L32Is a concave flat lens.
10. The high-pixel large-target lens of claim 9, wherein: the second lens group G2Further comprises a thirteenth lens L with positive focal power33And a fourteenth lens L having a negative refractive power34The eleventh lens L31Twelfth lens element L32Thirteenth lens element L33And a fourteenth lens L34The eleventh lens L is arranged from the object side to the image side in sequence31Being a biconvex lens, the twelfth lens L32Is a biconcave lens, the thirteenth lensMirror L33And a fourteenth lens L34Are both meniscus lenses.
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| CN114994879A (en) * | 2022-07-12 | 2022-09-02 | 舜宇光学(中山)有限公司 | Unmanned aerial vehicle camera lens |
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