CN116009222B - 4K double telecentric machine vision optical imaging system - Google Patents
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- CN116009222B CN116009222B CN202310168021.3A CN202310168021A CN116009222B CN 116009222 B CN116009222 B CN 116009222B CN 202310168021 A CN202310168021 A CN 202310168021A CN 116009222 B CN116009222 B CN 116009222B
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Abstract
The invention relates to the technical field of optical imaging systems, in particular to a 4K double telecentric machine vision optical imaging system, which comprises a system lens assembly and an image processing assembly, wherein a first lens to a twelfth lens are sequentially arranged from the object side surface of the optical imaging system towards the imaging surface of the optical imaging system according to a numerical sequence, the method of object side and image side chief ray angles and optical system aberration is a collaborative optimization method, and the collaborative optimization method is an evaluation function for setting the object side and image side chief rays to be zero degrees respectively with the normal angles of an object plane and an image plane, and simultaneously setting the aberration evaluation function of the optical imaging system. The system effectively corrects chromatic aberration of the 4K resolution optical system by adopting the low-dispersion optical material, and realizes the design of the 4K resolution double telecentric optical imaging system by adopting a cooperative optimization method of the principal ray angles of an object side and an image side and the aberration of the optical system, thereby realizing 4K high imaging resolution and meeting the requirement of high-precision measurement of machine vision.
Description
Technical Field
The invention relates to a visual optical imaging system, in particular to a 4K double telecentric machine visual optical imaging system, and belongs to the technical field of optical imaging systems.
Background
The high-resolution double-telecentric optical imaging system has wide application prospect in the field of machine vision, and the characteristics of double telecentricity ensure that far and near targets have the same magnification in the field of machine vision measurement, so that the requirement of machine vision measurement is met, but the resolution of the existing double-telecentric optical imaging system is lower, the requirement of machine vision high-precision measurement cannot be met, and the requirement of telecentricity is required to be met while the double-telecentric optical imaging system realizes high-resolution image quality, so that the realization of the high-resolution double-telecentric optical imaging system is a challenge.
Accordingly, there is a need for an improved 4K double telecentric machine vision optical imaging system that addresses the above-described issues.
Disclosure of Invention
The invention aims to provide a 4K double telecentric machine vision optical imaging system, which adopts a low-dispersion optical material to effectively correct chromatic aberration of a 4K resolution optical system, adopts a cooperative optimization method of object space, image space chief ray angles and optical system aberration, realizes the design of the 4K resolution double telecentric optical imaging system, realizes 4K high imaging resolution, and meets the requirement of machine vision high-precision measurement.
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
a 4K double telecentric machine vision optical imaging system comprising a system lens assembly and an image processing assembly, the system lens assembly being twelve lenses, the system lens assembly comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens;
the first lens to the twelfth lens are sequentially arranged from the object side surface of the optical imaging system towards the imaging surface of the optical imaging system according to the numerical sequence, the object side and image side chief ray angles and the optical system aberration method are collaborative optimization methods, the collaborative optimization methods are evaluation functions with the object side and image side chief ray angles of zero degrees respectively with the object plane and the normal line of the image plane, and meanwhile, the optical imaging system aberration evaluation functions are arranged, and the optical imaging system meets the following conditional expression:
TTL/ImgH is less than 1.0; and
a spectral range of 0.48 μm or less than 0.68 μm;
wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system, imgH is half the diagonal length of the effective pixel area on the imaging surface.
Preferably, the thicknesses of the first lens element to the twelfth lens element on the optical axis are TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11 and TP12, respectively;
the image processing assembly includes a filter and an image sensor.
Preferably, the first lens has a convex object side surface, and the thickness of TP1 is: 4mm +.Tp1 +.6mm;
the second lens is provided with a convex object side surface and a convex image side surface, and the thickness of TP2 is as follows: 6mm < TP2 < 8mm;
the third lens has a concave image side surface, and the thickness of TP3 is: 4mm +.Tp3 +.5 mm;
the fourth lens has a convex object side surface corresponding to the third lens, and the thickness of TP4 is: 5mm +.Tp4 +.8 mm;
the fifth lens has a convex object side surface, and has a refractive power, and the thickness of TP5 is: 5mm +.Tp5 +.7mm;
the sixth lens has positive refractive power, an object side surface protruding along an optical axis, and an image side surface protruding along the optical axis, the thickness of TP6 is: 2mm < TP6 < 4mm;
the seventh lens has a convex object side surface, and the thickness of TP7 is: 5mm +.TP 7 +.7 mm;
the eighth lens has negative focal power, and the thickness of the eighth lens is that of TP 8: TP8 mm-12 mm;
the ninth lens has a convex object side surface and a concave image side surface, the ninth lens has a negative refractive power, and the thickness of TP9 is: 4mm < TP9 < 7mm;
the tenth lens corresponds to the ninth lens, has a concave object side surface and a convex object side surface, has a positive refractive power, and has a thickness of TP10 of: 4mm +.Tp10 +.7mm;
the eleventh lens has a concave object side surface and a convex image side surface, the eleventh lens has a positive refractive power, and the refractive power of the eleventh lens is smaller than the refractive power of the tenth lens, the thickness of TP11 is: TP11 is 8mm or 12mm or less;
the twelfth lens has a convex object side surface and a concave image side surface, and the thickness of the TP12 is: 9mm +.TP 12 +.14 mm.
Preferably, the magnification of the object side and the image side is 1:1, the distortion satisfies the following conditions: f-tan (theta) = |0.5|%.
Preferably, the first lens to the twelfth lens are all low-dispersion optical glass, and the model of the low-dispersion optical glass is: H-FK95N.
Preferably, the effective focal length of the optical imaging system is f, the diameter of an entrance pupil of the optical imaging system is HEP, and the effective focal length f and the diameter of the entrance pupil HEP of the optical imaging system satisfy: f/HEP is less than or equal to 3.94.
Preferably, the distance between the fifth lens and the sixth lens is FS, |fs|+.20mm.
Preferably, the distance from the object side surface of the lens assembly to the image processing assembly is TTL, and the distance of the TTL is: ttl=100 mm.
Preferably, the radius of the full field of view of the optical imaging system is R, and the optical imaging system satisfies: r=7.3 mm.
Preferably, the first lens and the second lens each have positive optical power, and the first lens and the second lens are mainly used for converging object-side rays.
The invention has at least the following beneficial effects:
the system adopts a low-dispersion optical material to effectively correct chromatic aberration of the 4K resolution optical system, adopts a cooperative optimization method of principal ray angles of an object side and an image side and aberration of the optical system, realizes the design of a 4K resolution double telecentric optical imaging system, realizes 4K high imaging resolution, and meets the requirement of high-precision measurement of machine vision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block diagram of the optical path of a dual telecentric achromatic imaging system of the present invention;
FIG. 3 is a point diagram of an optical system of the present invention;
FIG. 4 is an optical path difference diagram of an optical system of the present invention;
FIG. 5 is a graph of the transfer function MTF of the optical system of the present invention;
fig. 6 is a distortion diagram of an optical system of the present invention.
In the figure, 1-system lens assembly, 101-first lens, 102-second lens, 103-third lens, 104-fourth lens, 105-fifth lens, 106-sixth lens, 107-seventh lens, 108-eighth lens, 109-ninth lens, 110-tenth lens, 111-eleventh lens, 112-twelfth lens, 2-image processing assembly, 201-filter, 202-image sensor.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so that the implementation process of how the technical means are applied to solve the technical problems and achieve the technical effects of the present application can be fully understood and implemented accordingly.
As shown in fig. 1 to 6, the 4K double telecentric machine vision optical imaging system provided in this embodiment includes a system lens assembly 1 and an image processing assembly 2, the system lens assembly 1 is twelve lenses, and the system lens assembly 1 includes:
the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the eighth lens 108, the ninth lens 109, the tenth lens 110, the eleventh lens 111, and the twelfth lens 112 are sequentially arranged from the object side surface of the optical imaging system toward the imaging surface of the optical imaging system in numerical order, the methods of object side, image side chief ray angles, and optical system aberrations are collaborative optimization methods, the collaborative optimization methods are evaluation functions of the object side, image side chief ray angles with the object plane and the image plane normal line angles being zero degrees, respectively, and at the same time, the optical imaging system aberration evaluation functions are set, and the optical imaging system satisfies the following conditional expressions:
TTL/ImgH is less than 1.0; and
a spectral range of 0.48 μm or less than 0.68 μm;
where TTL is the distance on the optical axis from the object side surface of the first lens 101 to the imaging surface of the optical imaging system, imgH is half the diagonal length of the effective pixel area on the imaging surface;
the invention provides a cooperative optimization method for the angles of object side and image side chief rays and the aberration of an optical system due to the mutual restriction of the double telecentric design and the high resolution image quality design, namely, an evaluation function for controlling the angles of the object side chief rays and the image side chief rays to be zero degrees respectively with the normal angles of an object plane and an image plane is arranged, and meanwhile, the aberration evaluation function of the optical imaging system is arranged, and the cooperative optimization design for the angles of the object side chief rays and the image side chief rays and the aberration of the optical system is realized by arranging the weight coefficients of the two evaluation functions, so that the spectral range of 0.48 mu m is less than or equal to 0.68 mu m, the emergent angles of the object side chief rays and the image side chief rays are all close to 0 DEG, and the requirement of high-precision measurement of machine vision is met.
The lens is characterized in that: the thicknesses of the first lens element 101 to the twelfth lens element 112 on the optical axis are TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11 and TP12, respectively, and the image processing assembly 2 comprises an optical filter 201 and an image sensor 202, so as to facilitate imaging and later imaging processing;
the first lens 101, the first lens 101 has a convex object side surface, and the thickness of TP1 is: 4mm +.Tp1+.6mm, the first lens 101 has positive refractive power, furthermore the first surface of the first lens 101 protrudes in the paraxial region, and the second surface may be aspherical in the paraxial region;
the second lens 102, the second lens 102 has a convex object-side surface and a convex image-side surface, and the thickness of TP2 is: 6mm +.Tp2 +.8mm, the second lens 102 also has positive refractive power, and the thickness of the second lens 102 is greater than the thickness of the first lens 101, the first lens 101 and the second lens 102 both have positive optical power, and the first lens 101 and the second lens 102 are mainly used for converging object side rays;
the third lens 103, the third lens 103 has a concave image-side surface, and the thickness of TP3 is: 4mm +.Tp3+.5mm, the third lens 103 has negative refractive power, the third lens has meniscus shape concave toward the image side;
a fourth lens 104, the fourth lens 104 having a convex object side surface corresponding to the third lens 103, the thickness of TP4 being: 5mm +.Tp4 +.8 mm;
the fifth lens 105, the fifth lens 105 has a convex object side surface, and the fifth lens 105 has a refractive power, and the thickness of TP5 is: 5mm +.Tp5+.7mm, both the fourth lens 104 and the fifth lens 105 have positive refractive power;
a sixth lens 106, the sixth lens 106 having a positive refractive power, an object-side surface protruding along the optical axis, and an image-side surface protruding along the optical axis, the thickness of TP6 being: 2mm is less than or equal to TP6 is less than or equal to 4mm, and the distance between the fifth lens 105 and the sixth lens 106 is FS, |FS| is less than or equal to 20mm, so that the double-telecentric optical imaging system has the characteristics of double telecentric optical imaging systems;
a seventh lens 107, the seventh lens 107 having a convex object side surface with positive refractive power, the fourth lens having a meniscus shape convex toward the object, the thickness of TP7 being: 5mm +.TP 7 +.7 mm;
a ninth lens 109, the ninth lens 109 having a convex object side surface and a concave image side surface, the ninth lens having a negative refractive power, the thickness of TP9 being: 4mm < TP9 < 7mm;
a tenth lens 110, the tenth lens 110 corresponding to the ninth lens 109, having a concave object side surface and a convex object side surface, the tenth lens 110 having a positive refractive power, the thickness of TP10 being: the thickness of the ninth lens 109 is equal to or less than 4mm and equal to or less than 7mm TP10, and the ninth lens 109 and the tenth lens 110 are corresponding to each other, so that the light propagation path is effectively changed;
an eleventh lens 111, the eleventh lens 111 having a concave object side surface and a convex image side surface, the eleventh lens 111 having a positive or negative refractive power, and the refractive power of the eleventh lens 111 being smaller than the refractive power of the tenth lens 110, further, the eleventh lens 111 may have a meniscus shape convex toward the image sensor, the TP11 having a thickness of: TP11 is 8mm or 12mm or less;
a twelfth lens 112, the twelfth lens 112 having a convex object-side surface and a concave image-side surface, the twelfth lens 112 having a positive or negative refractive power, the thickness of TP12 being: 9mm +.Tp12+.14mm, eleventh lens 111 and twelfth lens 112 change the path of light so that the ratio of image space to object space approaches 1:1.
further, as shown in fig. 6, the magnification of the object side and the image side is 1:1, the distortion satisfies the following conditions: f-tan (theta) = |0.5|%, a cooperative optimization method of object side and image side chief ray angles and optical system aberration is adopted, namely, an evaluation function for controlling the object side and image side chief ray angles to be zero degrees with the object plane normal line and the image plane normal line respectively is set, meanwhile, an optical imaging system aberration evaluation function is set, and the cooperative optimization design of the object side and image side chief ray angles and the optical system aberration is realized by setting the weight coefficients of the two evaluation functions, so that the design of an object side and image side double telecentric optical path is realized, the magnification is controlled within |0.5|%, and the clear imaging of a target area is realized;
the optical distortion of the variable optical imaging system in relation to aberrations, expressed as f-tan (theta), may further define the extent to which the aberration shifts between 50% and 100% of the field of view of the image, with the shortest and longest operating wavelengths being incident on the imaging plane through the aperture edge as a test mode, the performance of a particular optical imaging system being evaluated as excellent, and even further with the shortest and longest operating wavelengths being incident on the imaging plane through the aperture edge with a lateral aberration of less than 0.68 μm as a test mode.
The first lens 101 to the twelfth lens 112 are all low-dispersion optical glasses, and the types of the low-dispersion optical glasses are: the H-FK95N adopts low-dispersion optical materials to effectively correct chromatic aberration of the 4K resolution optical system, adopts low-dispersion optical glass materials such as H-FK95N and the like to correct chromatic aberration of the telecentric optical imaging system, and realizes 4K high imaging resolution.
In the present embodiment, as shown in fig. 1 to 5, the effective focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, and the effective focal length f and the entrance pupil diameter HEP of the optical imaging system satisfy: f/HEP +.3.94, the distance from the object side surface of the system lens assembly 1 to the image processing assembly 2 is TTL, and the distance of TTL is: ttl=100 mm, the radius of the full field of view range of the optical imaging system is R, the optical imaging system satisfies: r=7.3 mm, the actual image height is taken as the field of view of the system, the full field of view of the system is a circular area with the diameter of 14.6mm, the technical requirement that the imaging field of view is more than or equal to 12mm multiplied by 8mm can be completely covered, the working distance is 60mm, the working spectrum range of the achromatic imaging system is 0.48-0.68 mu m, the F number is 3.94, the system adopts 12 lenses, the total length is controlled to be 100mm, the axial dimension of the system can be ensured to meet the total requirement, the front two positive focal lenses of the system are mainly used for converging object side rays, the rear integral caliber of the system is controlled, the rear lens group is combined by a plurality of positive and negative focal lenses to realize achromatic correction and residual image difference correction, and meanwhile, the angle of the principal ray is controlled, so that the double telecentric light path structure is realized.
As shown in fig. 1 to 6, the principle of the 4K double telecentric machine vision optical imaging system provided in this embodiment is as follows:
the optical imaging system is used for limited working distance imaging, the actual image height is used as the field of view range of the system, the full field of view range of the system is a circular area with the diameter of 14.6mm, the technical requirement that the imaging field of view is more than or equal to 12mm multiplied by 8mm can be completely covered, the working distance is 60mm at the same time, the working spectrum range of the achromatic imaging system is 0.48-0.68 mu m, the F number is 3.94, the system adopts 12 lenses, the total length is controlled to be 100mm, the axial size of the system can be ensured to meet the total requirement, two front focal lenses of the system are mainly used for converging object rays, the whole caliber of the rear part of the system is controlled, the rear lens group is combined by a plurality of positive focal lenses and negative focal lenses, achromatic aberration correction and other image difference correction are realized, the angle of main rays is controlled at the same time, the double telecentric optical path structure is realized, the 4K high imaging resolution is realized, and the high-precision measurement requirement of machine vision is met.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude that an additional identical element is present in a commodity or system comprising the element.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (10)
1. A 4K double telecentric machine vision optical imaging system comprising a system lens assembly (1) and an image processing assembly (2), characterized in that the system lens assembly (1) is twelve lenses, the system lens assembly (1) comprising:
a first lens (101), a second lens (102), a third lens (103), a fourth lens (104), a fifth lens (105), a sixth lens (106), a seventh lens (107), an eighth lens (108), a ninth lens (109), a tenth lens (110), an eleventh lens (111), and a twelfth lens (112);
the first lens (101) to the twelfth lens (112) are sequentially arranged from the object side surface of the optical imaging system towards the imaging surface of the optical imaging system according to a numerical sequence, the object side and image side chief ray angles and the optical system aberration methods are collaborative optimization methods, the collaborative optimization methods are evaluation functions for setting the object side and image side chief rays to be zero degrees with the object plane and the normal line angles of the image plane respectively, and meanwhile, the optical imaging system aberration evaluation functions are set, and the optical imaging system meets the following conditional expressions:
TTL/ImgH is less than 1.0; and
a spectral range of 0.48 μm or less than 0.68 μm;
wherein TTL is the distance on the optical axis from the object side surface of the first lens (101) to the imaging surface of the optical imaging system, imgH is half the diagonal length of the effective pixel area on the imaging surface.
2. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the thicknesses of the first lens (101) to the twelfth lens (112) on the optical axis are TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11 and TP12 respectively;
the image processing assembly (2) comprises a filter (201) and an image sensor (202).
3. A 4K double telecentric machine vision optical imaging system according to claim 2, characterized in that:
the first lens (101), the first lens (101) has a convex object side surface, and the thickness of TP1 is: 4mm +.Tp1 +.6mm;
the second lens (102), the second lens (102) has a convex object side surface and a convex image side surface, and the thickness of TP2 is: 6mm < TP2 < 8mm;
-the third lens (103), the third lens (103) having a concave image side surface, the TP3 having a thickness of: 4mm +.Tp3 +.5 mm;
the fourth lens (104), the fourth lens (104) having a convex object side surface corresponding to the third lens (103), the TP4 having a thickness of: 5mm +.Tp4 +.8 mm;
the fifth lens (105), the fifth lens (105) having a convex object side surface, and the fifth lens (105) having a refractive power, the TP5 having a thickness of: 5mm +.Tp5 +.7mm;
the sixth lens (106), the sixth lens (106) having a positive refractive power, an object side surface protruding along an optical axis, and an image side surface protruding along the optical axis, the TP6 having a thickness of: 2mm < TP6 < 4mm;
-the seventh lens (107), the seventh lens (107) having a convex object side surface, the TP7 having a thickness of: 5mm +.TP 7 +.7 mm;
the eighth lens (108), the eighth lens (108) having a negative optical power, the TP8 having a thickness of: TP8 mm-12 mm;
-the ninth lens (109), the ninth lens (109) having a convex object side surface and a concave image side surface, the ninth lens (109) having a negative refractive power, the TP9 having a thickness of: 4mm < TP9 < 7mm;
the tenth lens (110), the tenth lens (110) corresponding to the ninth lens (109) having a concave object side surface and a convex object side surface, the tenth lens (110) having a positive refractive power, the TP10 having a thickness of: 4mm +.Tp10 +.7mm;
the eleventh lens (111), the eleventh lens (111) having a concave object side surface and a convex image side surface, the eleventh lens (111) having a positive refractive power, and the refractive power of the eleventh lens (111) being less than the refractive power of the tenth lens (110), the TP11 having a thickness of: TP11 is 8mm or 12mm or less;
the twelfth lens (112), the twelfth lens (112) having a convex object side surface and a concave image side surface, the thickness of the TP12 being: 9mm +.TP 12 +.14 mm.
4. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the magnification of the object side and the image side is 1:1, the distortion satisfies the following conditions: f-tan (theta) = |0.5|%.
5. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the first lens (101) to the twelfth lens (112) are all low-dispersion optical glass, and the types of the low-dispersion optical glass are as follows: H-FK95N.
6. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the effective focal length of the optical imaging system is f, the diameter of an entrance pupil of the optical imaging system is HEP, and the effective focal length f and the diameter HEP of the entrance pupil of the optical imaging system meet the following conditions: f/HEP is less than or equal to 3.94.
7. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the distance between the fifth lens (105) and the sixth lens (106) is FS, |FS|+.20mm.
8. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the distance from the object side surface of the system lens assembly (1) to the image processing assembly (2) is TTL, and the distance of the TTL is as follows: ttl=100 mm.
9. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the radius of the full field of view range of the optical imaging system is R, and the optical imaging system meets the following conditions: r=7.3 mm.
10. A 4K double telecentric machine vision optical imaging system according to claim 1, characterized in that: the first lens (101) and the second lens (102) each have positive optical power, and the first lens (101) and the second lens (102) are mainly used for converging object-side rays.
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| CN108267845B (en) * | 2018-03-20 | 2020-04-14 | 嘉兴中润光学科技有限公司 | Athermalized large-aperture objective optical system |
| CN208689245U (en) * | 2018-07-03 | 2019-04-02 | 嘉兴中润光学科技有限公司 | Short operating distance telecentric lens |
| CN109061856A (en) * | 2018-09-04 | 2018-12-21 | 嘉兴中润光学科技有限公司 | The adjustable imaging lens of object space and image space doubly telecentric |
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