Visual lens
阅读说明：本技术 一种视觉镜头 (Visual lens ) 是由 张占军 米士隆 韩妮 刘创标 于 2020-07-24 设计创作，主要内容包括：本发明实施例公开了一种视觉镜头。该视觉镜头包括：沿光轴依次排列的第一透镜组、光阑和第二透镜组；第一透镜组包括沿光轴从物方至像方依次排列的具有正光焦度的第一透镜、具有负光焦度的第二透镜、具有负光焦度的第三透镜、具有正光焦度的第四透镜、具有正光焦度的第五透镜和具有负光焦度的第六透镜；第二透镜组包括沿光轴从物方至像方依次排列的具有负光焦度的第七透镜、具有正光焦度的第八透镜、具有正光焦度的第九透镜、具有正光焦度的第十透镜和具有负光焦度的第十一透镜。本发明实施例提供的视觉镜头可以实现占用空间小、畸变小、工作距离宽的要求。(The embodiment of the invention discloses a visual lens. The visual lens includes: the lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along an optical axis; the first lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from the object side to the image side along the optical axis; the second lens group includes a seventh lens having negative power, an eighth lens having positive power, a ninth lens having positive power, a tenth lens having positive power, and an eleventh lens having negative power, which are arranged in order from the object side to the image side along the optical axis. The visual lens provided by the embodiment of the invention can meet the requirements of small occupied space, small distortion and wide working distance.)
1. A vision lens, comprising: the lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along an optical axis;
the first lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis;
the second lens group includes a seventh lens having negative power, an eighth lens having positive power, a ninth lens having positive power, a tenth lens having positive power, and an eleventh lens having negative power, which are arranged in order from the object side to the image side along the optical axis.
2. A vision lens according to claim 1, wherein the first lens group comprises a fixed lens group; the second lens group includes a focus lens group.
3. A vision lens according to claim 1, wherein the focal lengths of the first lens group and the vision lens satisfy the relation: 3.5<|fA/f|<7.5；
The focal lengths of the second lens group and the vision lens satisfy the relation: 0.9<|fB/f|<2.5；
Wherein f is the focal length of the visual lens, fAIs the focal length of the first lens group, fBIs the focal length of the second lens group.
4. A vision lens according to claim 1, wherein the focal lengths of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth and eleventh lenses and the focal length of the vision lens satisfy the following relationships, respectively:
3.0<|f1/f|<8.0；
1.5<|f2/f|<4.0；
0.7<|f3/f|<1.2；
1.0<|f4/f|<3.5；
0.9<|f5/f|<2.0；
1.0<|f6/f|<3.5；
0.7<|f7/f|<2.2；
0.7<|f8/f|<2.2；
0.9<|f9/f|<2.5；
1.2<|f10/f|<3.2；
1.0<|f11/f|<3.2；
wherein f is the visual lensFocal length of (f)1Is the focal length of the first lens, f2Is the focal length of the second lens, f3Is the focal length of the third lens, f4Is the focal length of the fourth lens, f5Is the focal length of the fifth lens, f6Is the focal length of the sixth lens, f7Is the focal length of the seventh lens, f8Is the focal length of the eighth lens, f9Is the focal length of the ninth lens, f10Is the focal length of the tenth lens, f11Is the focal length of the eleventh lens.
5. A vision lens according to claim 1, wherein the tenth lens and the eleventh lens constitute a first cemented lens.
6. A vision lens according to claim 1, wherein the seventh lens and the eighth lens constitute a second cemented lens.
7. A visual lens according to claim 6, wherein the Abbe number of the seventh lens and the Abbe number of the eighth lens satisfy the relation: l vd7-vd8 l > 30; wherein vd7 is the abbe number of the seventh lens, and vd8 is the abbe number of the eighth lens.
8. A vision lens as recited in claim 1, wherein said first lens, said second lens, said third lens, said fourth lens, said fifth lens, said sixth lens, said seventh lens, said eighth lens, said ninth lens, said tenth lens, and said eleventh lens are all glass spherical lenses.
9. The vision lens of claim 1, wherein 0.15< TTL/Imgh <0.28, where TTL is the total length of the vision lens and Imgh is the image height of the vision lens.
Technical Field
The embodiment of the invention relates to the technical field of optical imaging, in particular to a visual lens.
Background
With the increasing industrial automation degree, the continuous development of a machine vision system is driven.
In a machine vision system, the imaging quality of a lens plays a crucial role, and the overall performance of the machine vision system is directly influenced. With the increasing application of machine vision in a plurality of fields such as electronic product manufacturing, food packaging, intelligent logistics, medical diagnosis and the like, the technical requirements of machine vision lenses are higher and higher, for example, the vision lenses are required to have the characteristics of wide working distance, large support target surface, high pixels and the like. However, the vision lens in the prior art has low pixels, large distortion, small supporting target surface and narrow working distance.
Disclosure of Invention
The embodiment of the invention provides a visual lens, which is used for realizing the effects of high pixel occupation, small space, small distortion and wide working distance.
An embodiment of the present invention provides a visual lens, including: the lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged along an optical axis;
the first lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis;
the second lens group includes a seventh lens having negative power, an eighth lens having positive power, a ninth lens having positive power, a tenth lens having positive power, and an eleventh lens having negative power, which are arranged in order from the object side to the image side along the optical axis.
Optionally, the first lens group comprises a fixed lens group; the second lens group includes a focus lens group.
Optionally, focal lengths of the first lens group and the vision lens satisfy the relation: 3.5<|fA/f|<7.5；
The focal lengths of the second lens group and the vision lens satisfy the relation: 0.9<|fB/f|<2.5；
Wherein f is the focal length of the visual lens, fAIs the focal length of the first lens group, fBIs the firstFocal length of the two lens groups.
Optionally, focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens and a focal length of the vision lens respectively satisfy a relation:
3.0<|f1/f|<8.0；
1.5<|f2/f|<4.0；
0.7<|f3/f|<1.2；
1.0<|f4/f|<3.5；
0.9<|f5/f|<2.0；
1.0<|f6/f|<3.5；
0.7<|f7/f|<2.2；
0.7<|f8/f|<2.2；
0.9<|f9/f|<2.5；
1.2<|f10/f|<3.2；
1.0<|f11/f|<3.2；
wherein f is the focal length of the visual lens, f1Is the focal length of the first lens, f2Is the focal length of the second lens, f3Is the focal length of the third lens, f4Is the focal length of the fourth lens, f5Is the focal length of the fifth lens, f6Is the focal length of the sixth lens, f7Is the focal length of the seventh lens, f8Is the focal length of the eighth lens, f9Is the focal length of the ninth lens, f10Is the focal length of the tenth lens, f11Is the focal length of the eleventh lens.
Optionally, the tenth lens and the eleventh lens constitute a first cemented lens.
Optionally, the seventh lens and the eighth lens constitute a second cemented lens.
Optionally, an abbe number of the seventh lens and an abbe number of the eighth lens satisfy the relation: l vd7-vd8 l > 30; wherein vd7 is the abbe number of the seventh lens, and vd8 is the abbe number of the eighth lens.
Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens are all glass spherical lenses.
Optionally, the visual lens meets the condition that TTL/Imgh is less than 0.28 and is greater than 0.15, where TTL is the total length of the visual lens, and Imgh is the image height of the visual lens.
According to the visual lens provided by the embodiment of the invention, the first lens group, the diaphragm and the second lens group are sequentially arranged along the optical axis; the first lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis; the second lens group comprises a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, a tenth lens with positive focal power and an eleventh lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis, the problems of low pixel, large distortion, small supporting target surface and narrow working distance of the vision lens in the prior art are solved, and the effects of small occupied space, high pixel, small distortion and wide working distance are realized.
Drawings
Fig. 1 is a schematic structural diagram of a visual lens provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another visual lens provided in an embodiment of the present invention;
FIG. 3 is a graph of vertical axis chromatic aberration for 486nm, 588nm and 656nm of the vision lens of FIG. 2;
FIG. 4 is a graph of axial aberrations for the vision lenses 486nm, 588nm, 656nm shown in FIG. 2;
FIG. 5 is a plot of field curvature for the visual lenses 486nm, 588nm, 656nm shown in FIG. 2;
FIG. 6 is a plot of distortion at 588nm for the vision lens shown in FIG. 2;
FIG. 7 is a graph of vertical axis chromatic aberration for 486nm, 588nm and 656nm of the vision lens of FIG. 1;
FIG. 8 is a graph of axial aberrations of the vision lenses 486nm, 588nm, 656nm shown in FIG. 1;
FIG. 9 is a plot of field curvature for the visual lenses 486nm, 588nm, 656nm shown in FIG. 1;
fig. 10 is a distortion plot of the vision lens 588nm shown in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a visual lens according to an embodiment of the present invention, and as shown in fig. 1, the visual lens according to the embodiment of the present invention includes: a
Wherein, the focal power is equal to the difference between the convergence of the image side light beam and the convergence of the object side light beam, which characterizes the capability of the optical system to deflect the light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In this embodiment, each lens can be fixed in a lens barrel (not shown in fig. 1), and the optical power of the lens is reasonably distributed, so that the imaging effect of the visual lens is good.
In the present embodiment, the
According to the technical scheme of the embodiment, a first lens group, a diaphragm and a second lens group are arranged in sequence along an optical axis; the first lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis; the second lens group comprises a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with positive focal power, a tenth lens with positive focal power and an eleventh lens with negative focal power which are sequentially arranged from an object side to an image side along an optical axis, the problems of low pixel, large distortion, small supporting target surface and narrow working distance of the vision lens in the prior art are solved, and the effects of small occupied space, high pixel, small distortion and wide working distance are realized.
Optionally, with continued reference to fig. 1, the
Specifically, when the working distance is changed, the focusing lens group moves back and forth relative to the fixed lens group to focus, so that an optimal imaging surface is found, and the imaging quality is improved.
Alternatively, with continued reference to fig. 1, the focal lengths of the
Optionally, with continued reference to fig. 1, the focal lengths of the
The parameters of the lenses can be matched with each other, and the light line of the light beam is adjusted through the focal length of each lens, so that the effects of small occupied space, high pixel, small distortion and wide working distance are finally realized, the full-field optical distortion of the visual lens provided by the embodiment of the invention is less than 0.5%, the distortion degree of an image can be reduced, and good imaging quality can be maintained at the full working distance to adapt to different measurement requirements.
Alternatively, with continued reference to fig. 1, the
It should be noted that the
Alternatively, with continued reference to fig. 1, the
On the basis of the above scheme, optionally, with continued reference to fig. 1, the abbe number of the
Specifically, when | vd7-vd8| >30, it can be ensured that the
Optionally, with continued reference to fig. 1, the
Illustratively, the
Optionally, with continued reference to fig. 1, the
Optionally, the visual lens meets the condition that TTL/Imgh is less than 0.28 and is greater than 0.15, where TTL is the total length of the visual lens, and Imgh is the image height of the visual lens. It can be known that the visual lens provided by the embodiment has the characteristic of large supporting target surface. Meanwhile, the length of the visual lens provided by the embodiment is short.
The visual lens provided by the embodiment of the present invention will be further described with reference to specific examples, which should be construed as limiting the present application.
The following are exemplary: with continued reference to fig. 2, in this embodiment, the radius of curvature, thickness (i.e., distance between center points of adjacent mirror surfaces), refractive index, and abbe number of each lens from the object side to the image side along the optical axis in the vision lens shown in fig. 2 satisfy the conditions listed in table 1:
table 1 shows a design value for the visual lens (F12.07 mm; F2.0):
half of curvature
Thickness of
Refractive index
Abbe number
S1
100.17
3.00
1.62
60.4
S2
-116.55
0.10
S3
9.44
1.00
1.75
52.3
S4
7.14
4.00
S5
-34.67
1.00
1.85
23.8
S6
13.31
1.60
S7
-31.48
4.00
1.85
23.8
S8
-17.45
1.00
S9
13.12
3.20
1.79
47.5
S10
-52.37
1.00
S11
17.93
1.60
1.62
60.4
S12
10.05
3.20
Diaphragm
PL
3.39
S14
-9.18
2.50
1.62
60.4
S15
-4.15
1.00
1.79
47.5
S16
-11.62
0.23
S17
40.82
3.80
1.62
60.4
S18
-9.80
0.20
S19
31.30
2.50
1.75
52.3
S20
-20.00
0.80
S21
-11.05
1.00
1.85
23.8
S22
-209.07
2.91
S23
0.00
1.65
1.52
64.2
S24
0.00
7.48
The surface numbers in table 1 are numbered according to the surface order of the respective lenses, where "S1" represents the front surface of the first lens, "S2" represents the rear surface of the first lens, and so on; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air.
Wherein, FIG. 3 is a vertical axis chromatic aberration curve chart of 486nm, 588nm and 656nm of the visual lens shown in FIG. 2; FIG. 4 is a graph of axial aberrations for the vision lenses 486nm, 588nm, 656nm shown in FIG. 2; FIG. 5 is a plot of field curvature for the visual lenses 486nm, 588nm, 656nm shown in FIG. 2; fig. 6 is a distortion plot of the visual lens 588nm shown in fig. 2. As can be seen from fig. 3 and 4, the vertical axis aberration of the visual lens provided by the present embodiment is small, and the axial aberration is small. As can be seen from fig. 5, the curvature of field of the visual lens provided by the present embodiment is small, that is, the difference between the central image quality and the peripheral image quality is small during imaging. As can be seen from fig. 6, the full-field optical distortion of the visual lens provided in the present embodiment is small. As can be seen from fig. 3, 4, 5 and 6, the visual lens provided by the embodiment of the invention has good imaging quality, high pixel height, small space, small distortion and wide working distance.
Illustratively, with continued reference to fig. 1, in this embodiment, the curvature radius, thickness (i.e., distance between center points of adjacent mirror surfaces), refractive index, and abbe number of each lens from the object side to the image side along the optical axis in the lens shown in fig. 1 satisfy the conditions listed in table 2:
table 2 shows a design value for the visual lens (F12.1 mm; F2.0):
the surface numbers in table 2 are numbered according to the surface order of the respective lenses, where "S1" represents the front surface of the first lens, "S2" represents the rear surface of the first lens, and so on; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the material between the current surface and the next surface to light, the blank space represents that the current position is air, and the refractive index is 1; the abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air.
Wherein, FIG. 7 is a vertical axis chromatic aberration curve chart of 486nm, 588nm and 656nm of the visual lens shown in FIG. 1; FIG. 8 is a graph of axial aberrations of the vision lenses 486nm, 588nm, 656nm shown in FIG. 1; FIG. 9 is a plot of field curvature for the visual lenses 486nm, 588nm, 656nm shown in FIG. 1; fig. 10 is a distortion plot of the vision lens 588nm shown in fig. 1. As can be seen from fig. 7 and 8, the visual lens provided by the present embodiment has small vertical axis aberration and small axial aberration. As can be seen from fig. 9, the curvature of field of the visual lens provided by the present embodiment is small, that is, the difference between the central image quality and the peripheral image quality is small during imaging. As can be seen from fig. 10, the full-field optical distortion of the visual lens provided in the present embodiment is small. As can be seen from fig. 7, 8, 9 and 10, the visual lens provided by the embodiment of the invention has the advantages of good imaging quality, high pixel height, small space, small distortion and wide working distance.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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