CN113703142A - Long-focus lens with high pixels and large target surface - Google Patents
Long-focus lens with high pixels and large target surface Download PDFInfo
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- CN113703142A CN113703142A CN202111129226.8A CN202111129226A CN113703142A CN 113703142 A CN113703142 A CN 113703142A CN 202111129226 A CN202111129226 A CN 202111129226A CN 113703142 A CN113703142 A CN 113703142A
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- G02B15/00—Optical objectives with means for varying the magnification
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- 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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- 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
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Abstract
The invention discloses a high-pixel large-target-surface telephoto lens, which comprises a first lens group with positive focal power and a second lens group with negative focal power, which are sequentially arranged from an object side to an image side, wherein the first lens group comprises a front lens group with negative focal power and a rear lens group with positive focal power, which are sequentially arranged from the object side to the image side, when focusing is carried out, the first lens group moves along an optical axis, the second lens group is fixed relative to an image surface, and the focal power of the first lens group and the second lens group, the focal power between the front lens group and the rear lens group and the focal power of the rear lens group are determined by reasonably setting the focal ratio range of the lens and the second lens group. The lens has the characteristics of long focal length, high resolution, good picture quality and low distortion, can maintain stable and good imaging performance in the focusing process, has a small and light structure, and meets the imaging requirements of large target surface and high pixels.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a high-pixel large-target-surface telephoto lens.
Background
With the rapid development of industrial automation, machine vision is widely applied to the fields of production and manufacturing, quality detection, logistics, medicine, scientific research and the like, and a machine vision lens is an important component of an automatic machine and is generally used for monitoring and detecting targets in a specific range at a fixed position, which requires that the lens has the characteristics of small occupied space, large target surface, low distortion, high image quality and the like. For a long-focus fixed-focus lens, the total length and the outer diameter of the lens are difficult to control due to the long focal length, so that the product volume is difficult to be small; in addition, the whole group of focusing modes adopted by the traditional machine vision lens can hardly meet the requirement of a large-range working distance: when the working distance is far away from the optimal working position, the edge image quality is obviously reduced, and meanwhile, because the moving amount of the telephoto lens is large, a space ring is additionally arranged at the rear end of the lens to ensure the focusing range when the working distance is near. In view of the above, the present application provides a small long-focus wide-working-distance machine vision lens to overcome the above-mentioned drawbacks.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a high-pixel large-target-surface telephoto lens which has a long focal length, a high resolution, and low distortion, can maintain stable and good imaging performance during focusing, has a small and lightweight structure, and satisfies the imaging requirements of large target surface 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 telephoto lens, which comprises a first lens group G with positive focal power 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 negative focal power arranged from an object side to an image side in sequencefAnd a rear lens group G having positive 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 is the focal length of the lens, f2Is 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 positive optical power11First lens L11The object side surface is a convex surface, and the following conditions are met:
wherein R is1Is the first lens L11Radius of curvature of the object side.
Preferably, the first lens L11The following conditions are also satisfied:
wherein TTL is the total optical length of the lens, and D is the first lens L11θ is the half field angle of the lens.
Preferably, the front lens group GfAnd a second lens L with negative focal power12Second lens L12Is a biconcave lens, the first lens L11And a second lens L12Arranged from the object side to the image side in sequence.
Preferably, the front lens group GfAnd a third lens L with positive focal power13And a fourth lens L having a negative power14Third lens L13Is a meniscus lens, a fourth lens L14Is a biconcave lens, the first lens L11A second lens element L12A third lens element L13And a fourth lens L14Arranged from the object side to the image side in sequence.
Preferably, the rear lens group GbComprises a fifth lens L with positive focal power arranged from the object side to the image side21A sixth lens L having a negative refractive power22A seventh lens L having a negative refractive power23And an eighth lens L having a positive refractive power24And a ninth lens L having positive optical power25。
Preferably, the fifth lens L21Being a biconvex lens, a sixth lens L22Being cemented lens, seventh lens L23And an eighth lens L24A meniscus lens or a cemented lens, a ninth lens L25A meniscus lens or a biconvex lens.
Preferably, the rear lens group GbAnd a tenth lens L having a negative power26The tenth lens L26Is a meniscus 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 power32And the following conditions are satisfied:
nd31≤1.68 (5)
υd31≥27 (6)
nd32≥1.75 (7)
υd32≤55 (8)
wherein n isd31Is an eleventh lens L31D-line refractive index, vd31Is an eleventh lens L31Abbe number, n ofd32Is a twelfth lens L32D-line refractive index, vd32Is a twelfth lens L32Abbe number of (2).
Preferably, the eleventh lens L31And a twelfth lens L32Are both meniscus lenses.
Compared with the prior art, the invention has the beneficial effects that:
1) the lens determines that the first lens group and the second lens group form a telescopic structure with positive and negative focal powers by reasonably setting the focal length ratio range of the second lens group and the lens, can realize high-performance, low-distortion and large-target-surface imaging in a wide working distance range, meets the requirements of shortening the optical total length of the lens and maintaining good imaging performance, determines that the front lens group and the rear lens group form a reverse telescopic structure with negative and positive focal powers by reasonably setting the focal length ratio range between the front lens group and the rear lens group, ensures that the large-target-surface imaging is met while the total length of the first lens group is shortened, increases aberration correction capacity, realizes high-quality imaging, meets full-frame imaging, has a target-surface diagonal of 46mm, and has resolution of one hundred million pixels;
2) by controlling the shape and curvature radius of the lens surface of the first lens close to the object side and limiting the ratio of the total optical length of the lens, the optical caliber of the first lens and the field angle, the aberration can be effectively corrected, the total optical length is further shortened, the weight of the lens is reduced, and the small and light lens is realized while the large target surface is imaged;
3) through reasonably setting the focal power, the material refractive index and the Abbe number of the lens in the second lens group, the position chromatic aberration and the magnification chromatic aberration of an optical system can be controlled, and high-quality imaging is realized while the requirements on large target surface and miniaturization are 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 working distance of 500mm in accordance with an embodiment of the present invention;
FIG. 3 is a graph of MTF at a working distance of 500mm according to an embodiment of the present invention;
FIG. 4 is a graph of MTF at a working distance of 1000mm according to an embodiment of the present invention;
FIG. 5 is a graph of MTF at a working 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 chart of aberrations for a second embodiment of the present invention at a working distance of 500 mm;
FIG. 8 is a graph of MTF at a working distance of 500mm according to a second embodiment of the present invention;
FIG. 9 is a graph of MTF at a working distance of 1000mm according to a second embodiment of the present invention;
FIG. 10 is a graph of MTF at a working 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 working distance of 500mm in accordance with an embodiment of the present invention;
FIG. 13 is a graph of MTF at a working distance of 500mm according to an embodiment of the present invention;
FIG. 14 is a graph of MTF at 1000mm for a third working distance in accordance with an embodiment of the present invention;
FIG. 15 is a graph of MTF at 250mm for the third working distance of the 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 is to be noted that, 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-surface telephoto lens comprises a first lens group G with positive refractive 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 negative focal power arranged from an object side to an image side in sequencefAnd a rear lens group G having positive 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 is the focal length of the lens, f2Is 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).
The lens comprises a first lens group G1And a second lens group G2First lens group G1Comprising a front lens group GfAnd a rear lens group GbDuring operation, light rays sequentially pass through the front lens group GfA rear lens group GbAnd a second lens group G2To the image plane, the first lens group G1Is a focusing group having positive power, and the front lens group GfUsing a negative power, rear lens group GbWith positive focal power, the second lens group G2Is a fixed group with negative focal power and passes through the first lens group G1And the focusing is realized by moving along the optical axis. The lens is provided with a second lens group G reasonably2Determining the first lens group G according to the focal length ratio range of the lens1And a second lens group G2The telescopic structure with positive and negative focal power can realize high-performance, low-distortion and large-target-surface imaging in a wide working distance range, and the requirement of shortening the overall length and maintaining good imaging performance is met. On the other hand, through reasonably arranging the front lens group GfAnd a rear lens group GbThe focal length ratio range of the front lens group and the rear lens group is determined to form a reverse telescope structure with negative and positive focal powers, so that the first lens group G can be ensured1The total length is shortened, the imaging of a large target surface is met, the aberration correction capability of the focusing group is improved, the high-quality imaging is realized, the requirement of high pixels is met, the full-frame imaging is realized, the diagonal line of the target surface is 46mm, and the resolution reaches one hundred million pixels. Compared with the prior art, the lens does not need to move the whole group for focusing, does not need to increase a space ring to ensure the focusing range, and only needs to move the first lens group G1The close-range focusing can be realized.
If the second lens group G in the conditional expression (1) is exceeded2The lower limit of the focal length ratio of the second lens group G to the lens2The focal power of the lens is too low to correct the first lens group G1The introduced various aberrations such as spherical aberration, coma aberration and the like cause performance reduction; if the second lens group G in the conditional expression (1) is exceeded2The upper limit of the lower limit of the focal length ratio of the second lens group G to the lens2The focal power of the opposite lens is too large, which causes excessive correction of various aberrations such as spherical aberration and coma aberration, and the imaging quality is reduced. If the front lens group G in the formula (2) is exceededfAnd a rear lens group GbUpper limit of the focal length ratio of (1), the front lens group GfToo small focal power of (A) to the rear lens group GbAberration correction is carried out, so that overlarge aberrations such as spherical aberration, coma aberration and the like are caused, and the imaging performance is reduced; if the condition (2) is exceeded, the front lens group GfAnd a rear lens group GbLower limit of the focal length ratio of (1), the front lens group GfThe negative focal power of (2) is too large, so that the emergence angle is too slow, and the total length of the lens is increased.
In one embodiment, the front lens group GfComprising a first lens L having a positive optical power11First lens L11The object side surface is a convex surface, and the following conditions are met:
wherein R is1Is the first lens L11Radius of curvature of the object side.
Wherein the front lens group G is controlledfThe curvature radius of the object side surface of the middle-first lens can effectively correct spherical aberration, and the miniaturization of the telephoto lens is achieved while the large target surface imaging is realized. If the telephoto lens exceeds the first lens L in the conditional expression (3)11The lower limit of the ratio of the curvature radius of the object side surface to the focal length of the lens is that the curvature radius is too small, the focal power is too large, so that the introduced spherical aberration, coma aberration and other aberrations are too large, and the imaging performance is reduced; if the first lens L in the conditional expression (3) is exceeded11The upper limit of the ratio of the object side curvature radius to the lens focal length is that the curvature radius is too large, the focal power is too small, and the exit angle is too largeAnd slowly, the total lens length is increased.
In one embodiment, the first lens L11The following conditions are also satisfied:
wherein TTL is the total optical length of the lens, and D is the first lens L11θ is the half field angle of the lens.
Wherein the first lens group G is controlled1The lens shape of the first lens can effectively shorten the optical total length, and the miniaturization of the telephoto lens is achieved while the large target surface imaging is realized. The conditional expression (4) specifies the ratio range among the total optical length, the optical aperture of the first lens and the field angle, and when the conditional expression is satisfied, the total optical length of the telephoto lens can be effectively shortened, the weight of the lens can be reduced, and the requirement of a large target surface can be satisfied.
In one embodiment, the front lens group GfAnd a second lens L with negative focal power12Second lens L12Is a biconcave lens, the first lens L11And a second lens L12Arranged from the object side to the image side in sequence. Second lens L12For correcting the first lens L11Introduced spherical aberration to improve imaging quality.
In one embodiment, the front lens group GfAnd a third lens L with positive focal power13And a fourth lens L having a negative power14Third lens L13Is a meniscus lens, a fourth lens L14Is a biconcave lens, the first lens L11A second lens element L12A third lens element L13And a fourth lens L14Arranged from the object side to the image side in sequence. Third lens L13And a fourth lens L14For correcting spherical aberration and lowering the front lens group GfThe aberration of the imaging lens is reduced, and large-target-surface and high-quality imaging is realized.
In one embodiment, the rear lens group GbComprises a fifth lens with positive focal power arranged from the object side to the image sideMirror L21A sixth lens L having a negative refractive power22A seventh lens L having a negative refractive power23And an eighth lens L having a positive refractive power24And a ninth lens L having positive optical power25. Rear lens group GbFor forming a first lens group G1The positive focal power is provided, the coma aberration is corrected, the long-focus imaging is realized, and the high pixel requirement is met.
In one embodiment, the fifth lens L21Being a biconvex lens, a sixth lens L22Being cemented lens, seventh lens L23And an eighth lens L24A meniscus lens or a cemented lens, a ninth lens L25A meniscus lens or a biconvex lens.
In one embodiment, the rear lens group GbAnd a tenth lens L having a negative power26The tenth lens L26Is a meniscus lens.
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 power32And the following conditions are satisfied:
nd31≤1.68 (5)
υd31≥27 (6)
nd32≥1.75 (7)
υd32≤55 (8)
wherein n isd31Is an eleventh lens L31D-line refractive index, vd31Is an eleventh lens L31Abbe number, n ofd32Is a twelfth lens L32D-line refractive index, vd32Is a twelfth lens L32Abbe number of (2).
Wherein the second lens group G is reasonably set2The refractive index and the Abbe number of the middle glass material control the position chromatic aberration and the magnification chromatic aberration of an optical system within a certain range, and high-quality imaging is realized while the requirements on large target surface and miniaturization are met. If the upper limit of the conditional expression (5) is exceeded, the eleventh lens L31Of (2) a lightThe focal power is too large, the introduced magnification chromatic aberration is too large, and the peripheral imaging performance is low; if the lower limit of the conditional expression (6) is exceeded, the eleventh lens L31The chromatic dispersion of the material is overlarge, the chromatic aberration of the introduced position is overlarge, and the central imaging performance is low. If the lower limit of the conditional expression (7) is exceeded, the twelfth lens L32The focal power of the imaging system is insufficient, and the chromatic aberration of magnification moves to the positive direction, so that the chromatic aberration of magnification is insufficiently corrected, and the peripheral imaging performance is low; if the upper limit of the conditional expression (8) is exceeded, the twelfth lens L32The 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.
In one embodiment, the eleventh lens L31And a twelfth lens L32Are both meniscus lenses.
The present application is described in detail below by way of a number of examples.
Example 1:
as shown in FIGS. 1-5, the high-pixel large-target-surface telephoto lens in this embodiment includes a first lens group G1And a second lens group G2First lens group G1Comprising a front lens group GfAnd a rear lens group GbWherein the front lens group GfComprising L11、L12、L13、L14Rear lens group GbComprising L21、L22、L23、L24、L25A second lens group G2Comprising L31、L32Front lens group GfAnd a rear lens group GbAn aperture diaphragm ST and a second lens group G are arranged between the first lens group and the second lens group2And protective glass Cover is arranged between the image plane and the image plane. Wherein L is11Is a biconvex positive lens, L12Is a biconcave negative lens, L13Is a positive meniscus lens, L14Is a biconcave negative lens, L21Is a biconvex positive lens, L22Is a negative cemented lens, L23Is a negative meniscus lens, L24Is a positive meniscus lens, L25Is a positive meniscus lens; l is31Is a positive meniscus lens, L32Is a negative meniscus lens. And the following conditions are satisfied:
| conditional formula (II) | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| Example 1 | -4.04 | -0.11 | 0.41 | 1.76 | 1.68 | 27.24 | 1.91 | 30.22 |
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, 26 denotes an image plane, i.e., IMG, and surface numbers 1 to 25 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. It should be noted that the cemented surfaces of different lenses in the cemented lens are represented by the same surface.
The optical parameters of the lens are shown in table 2 below:
TABLE 2
In table 2, RED is the magnification, Fno is the aperture value, θ 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 13.63 degrees and the total optical length is 112.73mm at the standard working distance, and high-quality imaging of the phi 46mm target surface is realized. As shown in FIG. 2, the spherical aberration in the aberration diagrams is controlled within 0.1mm, the astigmatism and the curvature of field are controlled within 0.1mm, the optical distortion is less than 1%, and the requirements of various parameters of the large-target industrial lens are met. As shown in fig. 3-5, F1 to F5 in each figure sequentially correspond to abbreviations of image heights Y' of 0mm,11.5mm,16.1mm,20.7mm,23mm and T, R respectively for Tangential (Tangential) and Radial (Radial) directions, 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 pixels, large target surface and wide working distance are met, and the imaging quality is high.
Example 2:
as shown in FIGS. 6-10, the high-pixel large-target-surface telephoto lens in this embodiment includes a first lens group G1And a second lens group G2First lens group G1Comprising a front lens group GfAnd a rear lens group GbWherein the front lens group GfComprising L11、L12Rear lens group GbComprising L21、L22、L23、L24、L25、L26A second lens group G2Comprising L31、L32Front lens group GfAnd a rear lens group GbAn aperture diaphragm ST and a second lens group G are arranged between the first lens group and the second lens group2And protective glass Cover is arranged between the image plane and the image plane. Wherein L is11Is a positive meniscus lens, L12Is a biconcave negative lens, L21Is a biconvex positive lens, L22Is a negative cemented lens, L23Is a negative cemented lens, L24Is a positive cemented lens, L25Is a biconvex positive lens, L26Is a negative meniscus lens, L31Is a positive meniscus lens, L32Is a negative meniscus lens. And the following conditions are satisfied:
| conditional formula (II) | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| Example 2 | -5.18 | -0.20 | 0.74 | 2.35 | 1.54 | 50.96 | 1.75 | 52.64 |
Specifically, the optical parameters of each lens are shown in table 3 below:
TABLE 3
| Si | Name (R) | Radius of | Thickness of | nd | vd | Effective radius | |
| 0 | D(0) | ||||||
| 1 | L11 | 59.30 | 2.5 | 1.9454 | 19.89 | 13.13 | |
| 2 | 204.74 | 1.5 | 12.76 | ||||
| 3 | L12 | -83.90 | 0.8 | 1.6190 | 33.57 | 12.74 | |
| 4 | 80.77 | 2.9 | 12.67 | ||||
| 5 | ST | INF | 2.1 | 13.02 | |||
| 6 | L21 | 35.13 | 4.4 | 1.7660 | 51.36 | 13.08 | |
| 7 | -207.00 | 0.2 | 12.88 | ||||
| 8 | L22 | 60.01 | 0.8 | 1.6498 | 33.13 | 12.33 | |
| 9 | 16.93 | 3.8 | 1.5406 | 51.93 | 11.33 | ||
| 10 | 30.20 | 11.8 | 11.00 | ||||
| 11 | L23 | -25.42 | 0.8 | 1.78333 | 25.71 | 10.30 | |
| 12 | 39.10 | 5.6 | 1.75843 | 52.34 | 12.29 | ||
| 13 | -39.58 | 0.2 | 12.77 | ||||
| 14 | L24 | 69.16 | 7.3 | 1.83862 | 20.43 | 13.90 | |
| 15 | -24.43 | 7.0 | 1.76786 | 24.37 | 13.98 | ||
| 16 | 67.20 | 1.6 | 14.43 | ||||
| 17 | L25 | 2522.72 | 3.7 | 1.88813 | 40.87 | 14.46 | |
| 18 | -50.49 | 2.1 | 14.64 | ||||
| 19 | L26 | -27.80 | 4.6 | 1.49845 | 81.59 | 14.64 | |
| 20 | -52.34 | D(1) | 15.76 | ||||
| 21 | L31 | -174.71 | 6.9 | 1.54299 | 50.96 | 17.29 | |
| 22 | -61.23 | 10.9 | 17.75 | ||||
| 23 | L32 | -48.49 | 0.8 | 1.75303 | 52.64 | 17.48 | |
| 24 | -111.4297 | 33.5 | 17.86 | ||||
| 25 | Cover | INF | 2.0 | 1.51872 | 64.2 | 22.68 | |
| 26 | | INF | 1 | 22.86 |
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, surface numbers 1 to 35 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 26, i.e., IMG denotes the image plane. It should be noted that the cemented surfaces of different lenses in the cemented lens are represented 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, Fno is the aperture value, θ 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 13.68 degrees and the total optical length is 126.64mm at the standard working distance, and high-quality imaging of the phi 46mm target surface is realized. As shown in FIG. 7, the spherical aberration in the aberration diagrams is controlled within 0.1mm, the astigmatism and the curvature of field are controlled within 0.1mm, the optical distortion is less than 0.6%, 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,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 250mm respectively, the full image height MTF >0.45@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 3:
as shown in FIGS. 11-15, the high-pixel large-target-surface telephoto lens in this embodiment includes a first lens group G1And a second lens group G2First lens group G1Comprising a front lens group GfAnd a rear lens group GbWherein the front lens group GfComprising L11、L12Rear lens group GbComprising L21、L22、L23、L24、L25、L26A second lens group G2Comprising L31、L32Front lens group GfAnd a rear lens group GbAn aperture diaphragm ST and a second lens group G are arranged between the first lens group and the second lens group2And protective glass Cover is arranged between the image plane and the image plane. Wherein L is11Is a positive meniscus lens, L12Is a biconcave negative lens, L21Is a biconvex positive lens, L22Is a negative cemented lens, L23Is a negative cemented lens, L24Is a positive cemented lens, L25Is a biconvex positive lens, L26Is a negative meniscus lens; l is31Is a positive meniscus lens, L32Is a negative meniscus lens. And isThe following conditions are satisfied:
| conditional formula (II) | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| Example 3 | -3.51 | -0.16 | 0.59 | 2.15 | 1.61 | 34.37 | 1.89 | 40.87 |
Specifically, the optical parameters of each lens are shown in table 5 below:
TABLE 5
| Si | Name (R) | Radius of | Thickness of | nd | vd | Effective radius | |
| 0 | D(0) | ||||||
| 1 | L11 | 46.55 | 2.7 | 1.9481 | 19.44 | 13.13 | |
| 2 | 123.25 | 1.9 | 12.87 | ||||
| 3 | L12 | -76.31 | 0.8 | 1.6185 | 33.63 | 12.85 | |
| 4 | 75.14 | 1.2 | 12.75 | ||||
| 5 | ST | INF | 0.2 | 13.02 | |||
| 6 | L21 | 34.94 | 4.5 | 1.7672 | 51.22 | 12.93 | |
| 7 | -160.17 | 0.2 | 12.73 | ||||
| 8 | L22 | 57.49 | 0.8 | 1.6762 | 28.85 | 12.10 | |
| 9 | 16.80 | 3.6 | 1.5319 | 55.87 | 11.10 | ||
| 10 | 28.65 | 10.3 | 10.77 | ||||
| 11 | L23 | -25.28 | 0.8 | 1.8025 | 28.07 | 10.30 | |
| 12 | 37.74 | 5.1 | 1.7392 | 53.46 | 11.39 | ||
| 13 | -38.89 | 0.2 | 11.89 | ||||
| 14 | L24 | 61.62 | 6.9 | 1.8336 | 20.75 | 13.07 | |
| 15 | -23.50 | 4.5 | 1.7604 | 23.1 | 13.18 | ||
| 16 | 62.90 | 1.5 | 13.65 | ||||
| 17 | L25 | 863.85 | 3.6 | 1.8939 | 36.79 | 13.68 | |
| 18 | -50.02 | 2.0 | 13.88 | ||||
| 19 | L26 | -26.91 | 0.8 | 1.4985 | 81.59 | 13.88 | |
| 20 | -44.04 | D(1) | 14.30 | ||||
| 21 | L31 | -84.52 | 2.5 | 1.6131 | 34.37 | 16.35 | |
| 22 | -55.86 | 16.3 | 16.55 | ||||
| 23 | L32 | -43.32 | 4.7 | 1.8881 | 40.87 | 16.81 | |
| 24 | -73.04 | 27.2 | 18.00 | ||||
| 25 | Cover | INF | 2.0 | 1.5187 | 64.2 | 22.64 | |
| 26 | | INF | 1 | 22.84 |
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 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, 26 denotes an image plane, i.e., IMG, and surface numbers 1 to 25 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. It should be noted that the cemented surfaces of different lenses in the cemented lens are represented 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, Fno is the aperture value, θ 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 13.48 degrees and the total optical length is 117.79mm 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 in the aberration diagrams is controlled within 0.1mm, the astigmatism and the curvature of field are controlled within 0.1mm, the optical distortion is less than 0.8%, and 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 distance is 500mm, 1000mm and 250mm, the full image height MTF >0.4@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.
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 long-focus lens with high pixel and large target surface is characterized in that: the high-pixel large-target-surface telephoto lens comprises a first lens group G with positive focal power, which is arranged from the object side to the image side in sequence1And a second lens group G having negative refractive power2Said first lens group G1Comprises a front lens group G with negative focal power arranged from an object side to an image side in sequencefAnd a rear lens group G having positive 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 is the focal length of the lens, f2Is 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 tele lens of claim 1, wherein: the front lens group GfComprises a toolA first lens L having a positive refractive power11The first lens L11The object side surface is a convex surface, and the following conditions are met:
wherein R is1Is the first lens L11Radius of curvature of the object side.
3. The high-pixel large-target tele lens of claim 2, wherein: the first lens L11The following conditions are also satisfied:
wherein TTL is the total optical length of the lens, and D is the first lens L11Is the half field angle of the lens.
4. The high-pixel large-target tele lens of claim 2, wherein: the front lens group GfAnd a second lens L with negative focal power12The second lens L12Is a biconcave lens, the first lens L11And a second lens L12Arranged from the object side to the image side in sequence.
5. The high-pixel large-target tele lens of claim 4, wherein: the front lens group GfAnd a third lens L with positive focal power13And a fourth lens L having a negative power14The third lens L13Being a meniscus lens, said fourth lens L14Is a biconcave lens, the first lens L11A second lens element L12A third lens element L13And a fourth lens L14Arranged from the object side to the image side in sequence.
6. The high-pixel large-target tele lens of claim 1, wherein: the rear lens group GbComprises a fifth lens L with positive focal power arranged from the object side to the image side21A sixth lens L having a negative refractive power22A seventh lens L having a negative refractive power23And an eighth lens L having a positive refractive power24And a ninth lens L having positive optical power25。
7. The high-pixel large-target tele lens of claim 6, wherein: the fifth lens L21Being a biconvex lens, the sixth lens L22Being a cemented lens, the seventh lens L23And an eighth lens L24A meniscus lens or a cemented lens, the ninth lens L25A meniscus lens or a biconvex lens.
8. The high-pixel large-target tele lens of claim 7, wherein: the rear lens group GbAnd a tenth lens L having a negative power26The tenth lens L26Is a meniscus lens.
9. The high-pixel large-target tele 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 power32And the following conditions are satisfied:
nd31≤1.68 (5)
vd31≥27 (6)
nd32≥1.75 (7)
vd32≤55 (8)
wherein n isd31Is the eleventh lens L31D-line refractive index, vd31Is the eleventh lens L31Abbe number, n ofd32Is the twelfth lens L32D line ofRefractive index ud32Is the twelfth lens L32Abbe number of (2).
10. The high pixel large target telephoto lens as set forth in claim 9, wherein: the eleventh lens L31And a twelfth lens L32Are both meniscus lenses.
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