CN209765150U - Double telecentric optical system with ultralow distortion - Google Patents
Double telecentric optical system with ultralow distortion Download PDFInfo
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- CN209765150U CN209765150U CN201920524945.1U CN201920524945U CN209765150U CN 209765150 U CN209765150 U CN 209765150U CN 201920524945 U CN201920524945 U CN 201920524945U CN 209765150 U CN209765150 U CN 209765150U
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Abstract
The utility model discloses a double telecentric optical system with ultra-low distortion, which comprises a front lens group, a diaphragm and a rear lens group which are arranged from front to back in sequence along the incident direction of light; the front lens group includes a first lens, a second lens, and a third lens; the rear lens group comprises a fourth lens and a fifth lens; the first lens is a plano-convex lens or a double convex lens with positive focal power, the second lens and the fourth lens are double convex lenses with positive focal power, the third lens is a double concave lens with negative focal power, and the fifth lens is a meniscus lens with positive focal power; the fifth lens is a thick lens; the second lens and the third lens form a double cemented lens. The utility model discloses only adopt 5 conventional spherical lens components to realize the two sides telecentric design of object image, obtain the image quality and the extremely low distortion design of nearly diffraction limit, realize that the object space is not less than 200 mm's overlength working distance formation of image.
Description
Technical Field
The utility model relates to an optical system technical field, more specifically say and relate to a two telecentric optics system of ultralow distortion.
background
The industrial detection technology based on the telecentric optical system is applied to the fields of high-end automation, machine vision and the like, promotes technical iteration and industrial upgrading of industries such as automobile industry, semiconductor integrated circuit manufacturing, advanced material processing, aerospace high-precision assembly, household appliance manufacturing and the like, and shows superiority in realizing product performance, efficiency, precision and cost control. The object-image bilateral telecentric optical system can eliminate the visual error of an object to be detected in an object space, can also eliminate the magnification error caused by the position of an image detector at different image surface positions, obtains constant detection magnification, realizes the detection of characteristics such as undistorted shape and size, and is widely applied to the field of industrial detection.
the object image bilateral telecentric optical system on the market at present has the problems of more lenses, higher cost and the like, has the defects of edge distortion, higher telecentricity and the like in the aspect of imaging quality, cannot solve the technical problem of realizing the long working distance and high-resolution detection imaging, and cannot obtain the advantage of low-cost manufacture on the premise of solving the technical problem of the long working distance and high-resolution detection imaging.
SUMMERY OF THE UTILITY MODEL
The utility model provides a two telecentric optical system of ultralow distortion, through less lens quantity, realize high resolution and extremely low distortion formation of image, be favorable to reducing manufacturing cost.
The utility model provides a solution of its technical problem is: an ultra-low distortion double telecentric optical system comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged from front to back along the incident direction of light;
The front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from front to back;
the rear lens group comprises a fourth lens and a fifth lens which are arranged from front to back in sequence; the image plane of the optical system is positioned at the rear end of the fifth lens;
The first lens is a plano-convex lens or a double convex lens with positive focal power, the second lens and the fourth lens are double convex lenses with positive focal power, the third lens is a double concave lens with negative focal power, and the fifth lens is a meniscus lens with positive focal power; the fifth lens is a thick lens;
The second lens and the third lens form a double cemented lens.
Further, the ratio of the image height to the object height of the optical system is a magnification X, and the magnification X satisfies:
0.12≤|X|≤0.36。
Further, the focal power of the front lens group is positive, the focal power of the rear lens group is positive, and the focal power of the front lens group is positiveThe focal power of the rear lens group isWhereinAndthe ratio of (A) to (B) satisfies:
Furthermore, the included angle between the chief ray of the different object point beams of the optical system and the optical axis is theta1The included angle between the chief ray of the light beam reaching the image plane and the optical axis is theta2Theta of1And theta2Satisfies the following conditions:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
Further, the height value of the chief ray of the maximum field of view of the optical system on the first lens is hA1The height value of the chief ray of the maximum field of view on the second lens is hA2Then h isA2and hA1the ratio of (A) to (B) satisfies:
0.10≤|hA2/hA1|≤0.25。
Furthermore, the optical surface of the third lens close to the diaphragm is a first optical surface, the optical surface of the fourth lens close to the diaphragm is a second optical surface, and the height value of the chief ray of the off-axis field of view of the optical system on the first optical surface is hz1the height value of the chief ray of the off-axis visual field on the second optical surface is hz2Wherein h isz2/hz1Satisfies the following conditions:
-21.5≤hz2/hz1≤-15.5。
Further, the height value of the marginal ray of the on-axis field of view of the optical system on the first optical surface is h1the height value of the marginal ray of the on-axis field of view on the second optical surface is h2h is said2/h1Satisfies the following conditions:
0.85≤|h2/h1|≤1.15。
Further, the total optical power of the optical system isthe focal power of the first lens isthe focal power of the double-cemented lens formed by the second lens and the third lens isThe focal power of the fourth lens isThe focal power of the fifth lens isThen:
further, the material of first lens is heavy lanthanum flint glass, the material of second lens is lanthanum flint glass, the material of third lens is heavy flint glass, the material of fourth lens and fifth lens is heavy lanthanum flint glass.
Further, a CCD camera or a CMOS camera is arranged at the image surface and used for receiving the object plane signal.
the utility model has the advantages that: the utility model discloses optical system compact structure only adopts 5 conventional spherical lens components to realize the two side telecentric design of object image, obtains the image quality and the extremely low distortion design of nearly diffraction limit, realizes that the object space is not less than 200 mm's overlength working distance formation of image, can satisfy the detection imaging demand that service environment structure is limited, require long working distance to keep away from.
drawings
in order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a schematic diagram of the structure of the optical system of the present invention;
Fig. 2 is a graph of the optical transfer function of the optical system of the present invention;
Fig. 3 is a distortion diagram of the optical system of the present invention;
fig. 4 is a relative illuminance distribution graph of the optical system of the present invention.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The utility model discloses each technical feature in the creation can the interactive combination under the prerequisite that does not contradict conflict each other.
Embodiment 1, referring to fig. 1, an ultra-low distortion double telecentric optical system includes a front lens group, a diaphragm 600 and a rear lens group sequentially arranged from front to rear along a light incidence direction;
the front lens group comprises a first lens 100, a second lens 200 and a third lens 300 which are arranged from front to back in sequence;
The rear lens group includes a fourth lens 400 and a fifth lens 500 which are sequentially disposed from front to rear; an image plane 700 of the optical system is located at the rear end of the fifth lens 500;
the first lens 100 is a plano-convex lens or a double-convex lens with positive focal power, the second lens 200 and the fourth lens 400 are double-convex lenses with positive focal power, the third lens 300 is a double-concave lens with negative focal power, and the fifth lens 500 is a meniscus lens with positive focal power; the fifth lens 500 is a thick lens;
the diaphragm 600 is an aperture diaphragm.
The second lens 200 and the third lens 300 constitute a double cemented lens.
the fifth lens 500 is a thick lens, the curved shape of the thick lens faces the image plane 700, and the thick lens is located at a position which is nearly not halation, so that aberrations such as spherical aberration and coma aberration can be reduced, and meanwhile, the field curvature of the optical system can be effectively corrected, and the effect of a flat field design is obtained.
the utility model discloses a theory of operation: the light of an object plane is incident into the front lens group in a telecentric mode, the front lens group adopts a structural mode that a single lens is separated from a double-cemented lens to bear the main focal power and aberration of the system, the double-cemented lens adopts a glass material combination with similar refractive index and larger Abbe number difference to correct the chromatic aberration of the optical system, and other aberrations such as larger spherical aberration, coma aberration and the like are avoided; the light is converged by the front lens group and passes through the diaphragm 600; the light reaches the rear lens group from the diaphragm 600, further convergence of the light is realized, and aberrations such as curvature of field and astigmatism are corrected, and the fifth lens 500 is a meniscus-shaped thick lens, so that the light convergence is realized, and the effects of correcting distortion and curvature of field can be achieved. Finally, the object plane is imaged on the image plane 700, and finally, the clearly imaged image information is obtained.
As optimization, the ratio of the image height to the object height of the optical system is a magnification X, and the magnification X satisfies:
0.12≤|X|≤0.36。
After the object plane of the optical system is imaged by the optical system, the image plane 700 is imaged in a reduction mode.
Preferably, the focal power of the front lens group is positive, the focal power of the rear lens group is positive, and the focal power of the front lens group is positiveThe focal power of the rear lens group iswhereinandthe ratio of (A) to (B) satisfies:
For optimization, the included angle between the chief ray of different object point beams of the optical system and the optical axis is theta1the included angle between the chief ray of the light beam reaching the image plane 700 and the optical axis is theta2Theta of1and theta2Satisfies the following conditions:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
As an optimization, the height value of the chief ray of the maximum field of view of the optical system on the first lens 100 is hA1The height value of the chief ray of the maximum field of view on the second lens 200 is hA2Then h isA2And hA1The ratio of (A) to (B) satisfies:
0.10≤|hA2/hA1|≤0.25。
The diaphragm 600 is located between the third lens 300 and the fourth lens 400.
as an optimization, an optical surface of the third lens 300 close to the stop 600 is a first optical surface, an optical surface of the fourth lens 400 close to the stop 600 is a second optical surface, and a height value of a chief ray of the off-axis field of view of the optical system at the first optical surface is hz1The height value of the chief ray of the off-axis visual field on the second optical surface is hz2Wherein h isz2/hz1satisfies the following conditions:
-21.5≤hz2/hz1≤-15.5。
As an optimization, the height value of the marginal ray of the on-axis field of view of the optical system on the first optical surface is h1The height value of the marginal ray of the on-axis field of view on the second optical surface is h2H is said2/h1Satisfies the following conditions:
0.85≤|h2/h1|≤1.15。
As an optimization, the total optical power of the optical system isThe first lens 1An optical power of 00 ofThe focal power of the double cemented lens formed by the second lens 200 and the third lens 300 isThe focal power of the fourth lens 400 isthe fifth lens 500 has an optical power ofThen:
As an optimization, the material of the first lens 100 is heavy lanthanum flint glass, the material of the second lens 200 is lanthanum flint glass, the material of the third lens 300 is heavy flint glass, and the material of the fourth lens 400 and the material of the fifth lens 500 are both heavy lanthanum flint glass.
The utility model discloses optical system has only adopted the optical lens of a slice heavy-calibre, and all the other lenses are small-bore size, and all lens materials are low-cost conventional glass material, are favorable to reducing optical system's manufacturing cost by a wide margin, easily realize batch industrialization manufacturing and popularization.
as an optimization, a CCD camera or a CMOS camera is arranged at the image plane 700, and the CCD camera or the CMOS camera is used for receiving an object plane signal.
The CCD camera or the CMOS camera is used for receiving the object plane signals reduced by the optical system, so that clear and high-resolution object plane information is obtained.
the utility model discloses the biggest innovation has carried out low-cost optical system research and development, has reduced optical system's lens and has used quantity to adopt conventional low-cost optical glass material, its cost is the correction degree of difficulty increase of aberrations such as optical system spherical aberration, astigmatism, field curvature and distortion, needs to solve the aberration and restraines a difficult problem.
The utility model discloses the key structural feature and the aberration distribution characteristics of two side telecentric optics systems of object image, the initial structure based on being close to the symmetry carries out the structural change of asymmetry. Because the front lens group lens is close to an object plane with larger size, the size of the lens is larger, and in order to reduce the use of a large-aperture lens, a single-lens and double-lens separation mode is adopted, only the light-transmitting aperture of the single lens is equivalent to the size of an imaging object plane, and the size of the double-lens is not more than 0.25 of the size of the single lens, so that the use cost of the optical glass material is reduced; the single lens bears main focal power, the focal power of the double-cemented lens is smaller, the residual spherical aberration and coma aberration of the single lens are corrected, and chromatic aberration is mainly corrected; the rear lens group adopts a structural form of two positive focal power lenses far away from the diaphragm 600, wherein the fourth lens 400 bears the main focal power of the rear lens group, and the curved shape of the fourth lens plays a role in increasing the aberration of the rear lens group and compensating the aberrations such as spherical aberration, coma aberration, astigmatism and the like generated by the large-aperture optical system of the front lens group; the last lens is in a thick lens form, the curved shape faces the image plane 700 and is located at a position which is nearly not dizzy, so that the spherical aberration, the coma aberration and other aberrations can be reduced, meanwhile, the field curvature of the optical system can be effectively corrected, and the effect of a flat field design is obtained. Finally, the imaging quality close to the diffraction limit is obtained.
The embodiment of the utility model provides an in, object space telecentric degree is no longer than 0.15, and image space telecentric degree is no longer than 0.25, and the problem of perspective image distortion can effectively be solved in object space telecentric design, combines image space telecentric design can realize fixed multiplying power and not receive the influence of image plane 700 position. The object space telecentricity design result of the optical system shows that the chief ray of an imaging object plane is parallel to the optical axis, and no matter where the object plane is located, the imaging multiplying power of the optical system to the height of an object cannot be influenced. That is, the magnifications of the image space and the object space are constant, providing the optical system with an image capturing capability of low distortion and eliminating visual errors. The distortion of the full field of view is not more than 0.007%, the measurement error caused by distortion is eliminated, and the measurement precision of the optical system is improved.
The utility model discloses optical system has only adopted 5 lens to reach nearly diffraction limit imaging quality, has small, light in weight, and low in manufacturing cost's advantage is favorable to promoting on market.
in this embodiment, an ultra-low distortion double telecentric optical system meeting the parameter requirement of the optical system is designed according to the parameter design requirement of the optical system, and the technical indexes of the optical system are as follows:
Image-side numerical aperture: 0.075;
object space imaging size: 35 mm;
object space working distance: 200 mm;
Magnification: 0.2;
optical relative distortion: less than or equal to 0.007%;
Imaging spectral band: 486nm to 656 nm;
Object space telecentricity: not more than 0.15 degree;
And (3) pixel telecentricity: not more than 0.25 degree;
Total optical length: less than or equal to 245 mm;
Relative illuminance: not less than 99.2 percent.
referring to his 2, fig. 2 represents the optical transfer function curve distribution of the whole optical system in the embodiment of the present invention, the optical transfer function value of all the fields of view of the optical system reaches above 0.34 at 130lp/mm, the near diffraction limit image quality is realized, and the imaging quality is good.
Referring to fig. 3, fig. 3 has characterized the utility model discloses optical system's distortion distribution curve, and the distortion is no longer than 0.007%, is close to zero, has effectively avoided the measuring error that the distortion arouses.
Referring to fig. 4, fig. 4 shows the image plane illuminance distribution of the optical system, in the imaging range, the image plane illuminance uniformity reaches more than 99.2%, and the image plane illuminance uniformity is ensured.
The utility model discloses optical system compact structure only adopts 5 conventional spherical lens components to realize the two sides telecentric design of object image, obtains the image quality and the extremely low distortion design of nearly diffraction limit, satisfies the demand that high-end industry detects machine vision to high resolution detection formation of image. The imaging of the object space is realized to be not less than 200mm, and the detection imaging requirements of limited use environment structure and long working distance requirement can be met.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (10)
1. an ultra-low distortion double telecentric optical system, comprising: the lens comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged from front to back along the incident direction of light;
The front lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from front to back;
The rear lens group comprises a fourth lens and a fifth lens which are arranged from front to back in sequence; the image plane of the optical system is positioned at the rear end of the fifth lens;
the first lens is a plano-convex lens or a double convex lens with positive focal power, the second lens and the fourth lens are double convex lenses with positive focal power, the third lens is a double concave lens with negative focal power, and the fifth lens is a meniscus lens with positive focal power; the fifth lens is a thick lens;
The second lens and the third lens form a double cemented lens.
2. an ultra-low distortion double telecentric optical system according to claim 1, wherein: the ratio of the image height to the object height of the optical system is magnification X, and the magnification X satisfies the following conditions:
0.12≤|X|≤0.36。
3. An ultra-low distortion double telecentric optical system according to claim 1, wherein: the focal power of the front lens group is positive, the focal power of the rear lens group is positive, and the focal power of the front lens group is positiveThe focal power of the rear lens group isWhereinandthe ratio of (A) to (B) satisfies:
4. an ultra-low distortion double telecentric optical system according to claim 1, wherein: the included angle between the chief ray of different object point beams of the optical system and the optical axis is theta1The included angle between the chief ray of the light beam reaching the image plane and the optical axis is theta2Theta of1And theta2Satisfies the following conditions:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
5. an ultra-low distortion double telecentric optical system according to claim 1, wherein: maximum viewing of the optical systemThe height of the chief ray of the field on the first lens is hA1the height value of the chief ray of the maximum field of view on the second lens is hA2Then h isA2and hA1The ratio of (A) to (B) satisfies:
0.10≤|hA2/hA1|≤0.25。
6. An ultra-low distortion double telecentric optical system according to claim 1, wherein: the optical surface of the third lens close to the diaphragm is a first optical surface, the optical surface of the fourth lens close to the diaphragm is a second optical surface, and the height value of the chief ray of the off-axis field of the optical system on the first optical surface is hz1The height value of the chief ray of the off-axis visual field on the second optical surface is hz2Wherein h isz2/hz1Satisfies the following conditions:
-21.5≤hz2/hz1≤-15.5。
7. an ultra-low distortion double telecentric optical system according to claim 6, wherein: the height value of marginal ray of on-axis field of view of the optical system on the first optical surface is h1The height value of the marginal ray of the on-axis field of view on the second optical surface is h2H is said2/h1Satisfies the following conditions:
0.85≤|h2/h1|≤1.15。
8. An ultra-low distortion double telecentric optical system according to claim 1, wherein: the total focal power of the optical system isthe focal power of the first lens isThe focal power of the double-cemented lens formed by the second lens and the third lens isThe focal power of the fourth lens isThe focal power of the fifth lens isThen:
9. An ultra-low distortion double telecentric optical system according to claim 1, wherein: the material of first lens is heavy lanthanum flint glass, the material of second lens is lanthanum flint glass, the material of third lens is heavy flint glass, the material of fourth lens and fifth lens is heavy lanthanum flint glass.
10. An ultra-low distortion double telecentric optical system according to claim 1, wherein: and a CCD camera or a CMOS camera is arranged at the image surface and used for receiving an object plane signal.
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| CN110007448A (en) * | 2019-04-16 | 2019-07-12 | 佛山科学技术学院 | A kind of double telecentric optical system of ultra-low distortion |
| CN110007448B (en) * | 2019-04-16 | 2023-11-28 | 佛山科学技术学院 | Ultra-low distortion double telecentric optical system |
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Assignee: SHENZHEN NEW INDUSTRIES MATERIAL OF OPHTHALMOLOGY Co.,Ltd. Assignor: FOSHAN University Contract record no.: X2023980034279 Denomination of utility model: A Dual Telecentric Optical System with Ultra Low Distortion Granted publication date: 20191210 License type: Common License Record date: 20230403 |
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