CN109164559B - Large-numerical aperture near-infrared object image bilateral telecentric optical system - Google Patents
Large-numerical aperture near-infrared object image bilateral telecentric optical system Download PDFInfo
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- CN109164559B CN109164559B CN201811184809.9A CN201811184809A CN109164559B CN 109164559 B CN109164559 B CN 109164559B CN 201811184809 A CN201811184809 A CN 201811184809A CN 109164559 B CN109164559 B CN 109164559B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 230000002146 bilateral effect Effects 0.000 title claims abstract description 12
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 14
- 239000005308 flint glass Substances 0.000 claims description 14
- 239000005331 crown glasses (windows) Substances 0.000 claims description 10
- 229910052746 lanthanum Inorganic materials 0.000 claims description 8
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 11
- 230000004075 alteration Effects 0.000 description 15
- 238000013461 design Methods 0.000 description 4
- 238000002329 infrared spectrum Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 208000001644 thecoma Diseases 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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Abstract
The invention discloses a large numerical aperture near infrared object image bilateral telecentric optical system, which comprises a first lens, a second lens, a beam splitting prism, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a diaphragm, wherein the first lens, the second lens, the beam splitting prism, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the diaphragm are sequentially arranged in the propagation direction from an image plane to an object plane. The first lens adopts a biconvex positive focal power lens, the second lens adopts a biconcave negative focal power lens, the third lens adopts a meniscus positive focal power lens, the fourth lens adopts a biconvex positive focal power lens, the fifth lens adopts a biconcave negative focal power lens, the sixth lens adopts a biconvex positive focal power lens, the seventh lens adopts a biconvex positive focal power lens, and the eighth lens adopts a meniscus positive focal power lens. The numerical aperture of the object side reaches 0.5, and the detection and collection capability is strong; the resolution reaches 0.85 mu m, and high-resolution imaging can be realized; in addition, the invention can realize bilateral telecentricity of the object image and low distortion.
Description
Technical Field
The invention relates to the field of optics, in particular to a large numerical aperture near infrared object image bilateral telecentric optical system.
Background
The current machine vision system adopts an object-image bilateral telecentric optical system, has the advantages of no image deformation, no viewing angle error, ultra-wide depth of field, ultra-low distortion, constant imaging multiplying power and the like, has obvious technical advantages compared with the common industrial lens, and is widely applied to the field of precise industrial detection. The object-image bilateral telecentric optical lens in the existing market is generally applied to the visible light detection spectrum, and telecentric industrial lenses in the near infrared spectrum have few types and have the defects of insufficient resolution, insufficient detection capability and the like.
Disclosure of Invention
Aiming at the defects of the existing object space telecentric optical system, the invention provides a large numerical aperture near infrared object image bilateral telecentric optical system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the large numerical aperture near infrared object image bilateral telecentric optical system comprises a first lens, a second lens, a beam splitting prism, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged in the propagation direction of light rays from an image plane to an object plane;
the first lens and the second lens form a front lens group, and the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens form a rear lens group;
the focal power of the front lens group is phi A, the focal power of the rear lens group is phi C, the focal power of the system is phi,
the ratio of phia to phisatisfies the following condition:
1.8≤φA/φ≤2.2；
the ratio of C to phi satisfies the following condition:
9.1≤φC/φ≤10.5。
further, the curvature radius of the front surface of the first lens is 32.863mm, the curvature radius of the rear surface of the first lens is-55.462 mm, the center thickness of the first lens is 4.2mm, and the light transmission caliber of the first lens is phi 16.8mm; the curvature radius of the front surface of the second lens is-24.588 mm, the curvature radius of the rear surface of the second lens is 14.602mm, the center thickness of the second lens is 2.5mm, and the light transmission caliber of the second lens is phi 12.2mm; the curvature radius of the front surface of the third lens is-468.981 mm, the curvature radius of the rear surface of the third lens is-52.485 mm, the center thickness of the third lens is 8.7mm, and the light-transmitting aperture of the third lens is phi 52.3mm; the curvature radius of the front surface of the fourth lens is 140.698mm, the curvature radius of the rear surface of the fourth lens is-162.111 mm, the center thickness of the fourth lens is 6.7mm, and the light transmission caliber of the fourth lens is phi 50.2mm; the curvature radius of the front surface of the fifth lens is-66.202 mm, the curvature radius of the rear surface of the fifth lens is 39.859mm, the center thickness of the fifth lens is 2.5mm, and the light-transmitting aperture of the fifth lens is phi 48.2mm; the curvature radius of the front surface of the sixth lens is 39.859mm, the curvature radius of the rear surface of the sixth lens is-185.774 mm, the center thickness of the sixth lens is 11.9mm, and the light transmission caliber of the sixth lens is phi 48.2mm; the curvature radius of the front surface of the seventh lens is 50.225mm, the curvature radius of the rear surface of the seventh lens is-578.471, the center thickness of the seventh lens is 9.6mm, and the light transmission caliber of the seventh lens is phi 49.1mm; the curvature radius of the front surface of the eighth lens is 23.513mm, the curvature radius of the rear surface of the eighth lens is 35.756mm, the center thickness of the eighth lens is 5.1mm, and the light transmission caliber of the eighth lens is phi 29.2mm.
Further, the fifth lens and the sixth lens form a double cemented lens.
Further, the first lens adopts a biconvex positive focal power lens, the second lens adopts a biconcave negative focal power lens, the third lens adopts a meniscus positive focal power lens, the fourth lens adopts a biconvex positive focal power lens, the fifth lens adopts a biconcave negative focal power lens, the sixth lens adopts a biconvex positive focal power lens, the seventh lens adopts a biconvex positive focal power lens, and the eighth lens adopts a meniscus positive focal power lens.
Further, the first lens is made of heavy lanthanum flint glass material, the second lens is made of flint glass material, the third lens is made of dense crown glass material, the fourth lens is made of crown glass material, the fifth lens is made of flint glass material, the sixth lens is made of dense crown glass material, the seventh lens is made of heavy lanthanum flint glass material, and the eighth lens is made of heavy lanthanum flint glass material.
The invention has the following beneficial effects:
the invention adopts near infrared spectrum to carry out industrial detection imaging, and has the advantages of strong external light impurity resistance and difficult interference compared with visible spectrum;
the invention realizes large numerical aperture detection imaging, solves the problem of insufficient detection capability of the current CCD or CMOS camera in the near infrared spectrum, and is beneficial to obtaining high-contrast image information of the detected object;
the resolution of the invention reaches 0.85 mu m, the detection capability of physical resolution entering submicron imaging is realized, and the requirement of high-resolution detection imaging by high-end industrial detection machine vision is met.
Drawings
FIG. 1 is a schematic diagram of the composition of an optical system according to the present invention;
FIG. 2 is a graph of the optical transfer function of an optical system of the present invention at 600 lp/mm;
fig. 3 is a distortion chart of the optical system of the present invention.
Detailed Description
For the purpose of facilitating a better understanding of the nature of the present invention by those of ordinary skill in the art, reference will now be made in detail to the following detailed description of the invention taken in conjunction with the accompanying drawings.
Referring to fig. 1, 2 and 3, a large numerical aperture near infrared object image double-sided telecentric optical system includes a first lens 1, a second lens 2, a beam splitting prism 3, a third lens 4, a fourth lens 5, a diaphragm 6, a fifth lens 7, a sixth lens 8, a seventh lens 9 and an eighth lens 10, which are sequentially arranged in a propagation direction of light rays along an image plane 11 to an object plane 12;
the first lens 1 and the second lens 2 form a front lens group, and the third lens 4, the fourth lens 5, the fifth lens 7, the sixth lens 8, the seventh lens 9 and the eighth lens 10 form a rear lens group.
The near infrared illumination light source is coupled with the imaging optical lens through the beam splitter prism 3.
In the preferred embodiment, a CCD or CMOS camera may be placed on the image plane 11 to receive the object plane signal amplified by the industrial lens system, so as to obtain clear and high-magnification object plane information.
The focal power of the front lens group is phi A, the focal power of the rear lens group is phi C, the focal power of the system is phi,
the ratio of phia to phisatisfies the following condition:
1.8≤φA/φ≤2.2；
the ratio of C to phi satisfies the following condition:
9.1≤φC/φ≤10.5。
in this embodiment, the respective lens sizes are as follows: the curvature radius of the front surface of the first lens 1 is 32.863mm, the curvature radius of the rear surface is-55.462 mm, the center thickness is 4.2mm, and the light transmission caliber of the lens is phi 16.8mm; the curvature radius of the front surface of the second lens 2 is-24.588 mm, the curvature radius of the rear surface is 14.602mm, the center thickness is 2.5mm, and the light-transmitting aperture of the lens is phi 12.2mm; the curvature radius of the front surface of the third lens 4 is-468.981 mm, the curvature radius of the rear surface is-52.485 mm, the center thickness is 8.7mm, and the light-transmitting aperture of the lens is phi 52.3mm; the curvature radius of the front surface of the fourth lens 5 is 140.698mm, the curvature radius of the rear surface is-162.111 mm, the center thickness is 6.7mm, and the light-transmitting aperture of the lens is phi 50.2mm; the curvature radius of the front surface of the fifth lens 7 is-66.202 mm, the curvature radius of the rear surface is 39.859mm, the center thickness is 2.5mm, and the light-transmitting aperture of the lens is phi 48.2mm; the curvature radius of the front surface of the sixth lens 8 is 39.859mm, the curvature radius of the rear surface is-185.774 mm, the center thickness is 11.9mm, and the light-transmitting aperture of the lens is phi 48.2mm; the curvature radius of the front surface of the seventh lens 9 is 50.225mm, the curvature radius of the rear surface is-578.471, the center thickness is 9.6mm, and the light transmission caliber of the lens is phi 49.1mm; the curvature radius of the front surface of the eighth lens 10 is 23.513mm, the curvature radius of the rear surface is 35.756mm, the center thickness is 5.1mm, and the light transmission caliber of the lens is phi 29.2mm
The fifth lens 7 and the sixth lens 8 form a cemented doublet.
In this embodiment, each lens is made of the following materials: the first lens 1 is made of heavy lanthanum flint glass material, the second lens 2 is made of flint glass material, the third lens 4 is made of heavy crown glass material, the fourth lens 5 is made of crown glass material, the fifth lens 7 is made of flint glass material, the sixth lens 8 is made of crown glass material, the seventh lens 9 is made of heavy crown glass material, and the eighth lens 10 is made of heavy lanthanum flint glass material.
The first lens 1 adopts a biconvex positive focal power lens, the second lens 2 adopts a biconcave negative focal power lens, the third lens 4 adopts a meniscus positive focal power thick lens, the fourth lens 5 adopts a biconvex positive focal power lens, the fifth lens 7 adopts a biconcave negative focal power lens, the sixth lens 8 adopts a biconvex positive focal power lens, the seventh lens 9 adopts a biconvex positive focal power lens, and the eighth lens 10 adopts a meniscus positive focal power lens.
In this embodiment, the placement relationship of each lens is: the distance between the first lens 1 and the second lens 2 is 11.2mm; the distance between the second lens 2 and the beam-splitting prism 3 is 11.7mm; the distance between the beam-splitting prism 3 and the third lens 4 is 61.7mm; the distance between the third lens 4 and the fourth lens 5 is 3.0mm; the distance between the fourth lens 5 and the diaphragm 6 is 1.2mm; the distance between the diaphragm 6 and the fifth lens 7 is 6.1mm; the distance between the sixth lens 8 and the seventh lens 9 is 0.5mm; the distance between the seventh lens 9 and the eighth lens 10 is 28.5mm; the eighth lens 10 is spaced apart from the object plane 12 by 25mm.
The optical system of the invention belongs to object-image bilateral telecentric light paths, the included angle between the object-space chief ray and the optical axis is not more than 0.02 degrees, and the included angle between the image-space chief ray and the optical axis is not more than 0.05 degrees.
The large numerical aperture near infrared object image bilateral telecentric optical system comprises the following specific parameters:
an object side numerical aperture of 0.5; imaging magnification 4 times; the working distance of the object space is 25mm; the relative distortion is not more than 0.015%; the resolution of the object space is 0.85 mu m; imaging spectrum is 800nm to 850nm.
As can be seen from fig. 2, the optical transfer function value of all the fields of view of the present optical system is nearly 0.4 at 600lp/mm, and the diffraction limit image quality is achieved, and the imaging quality is good.
As can be seen from fig. 3, the distortion of the invention is not more than 0.015% and is close to zero within the range of 10mm of the field of view of the image space, thereby effectively avoiding the measurement error caused by the distortion.
In the embodiment of the invention, the technical problem that the detection resolution of the near infrared spectrum is limited by longer wavelength and is not easy to improve is mainly solved, and the design of a large numerical aperture optical system with diffraction limit image quality is realized. In order to realize high resolution of 0.85 mu m, the numerical aperture of the optical system reaches more than 0.5; the light receiving angle of the system to the object plane reaches 60 degrees, the main aberration of the optical system is spherical aberration and coma aberration, and more than seven-level aberration can be generated besides three-level aberration and five-level aberration. In order to solve the problem, the lens group on one side of an object plane is mainly subjected to complicated design by adopting a complicated Petzval optical structure type, the near-halation lens is adopted to bear focal power, and the spherical aberration of the position is in a minimum value, so that the spherical aberration of the system can be effectively reduced; correcting chromatic aberration by adopting a combination of a double-cemented lens and a single lens; and the spherical aberration and the coma aberration generated by the concave surface and the bonding surface of the double-bonding lens are corrected by adopting two single lenses. From the aberration correction result, the design perfectly corrects spherical aberration, coma aberration, astigmatism, field curvature, distortion and chromatic aberration. The imaging quality of diffraction limit is finally obtained, and the imaging resolution is better than 0.85 μm under the condition that the numerical aperture reaches 0.5, which is not realized by the existing products on the market.
In the embodiment of the invention, the object telecentricity is not more than 0.02 degrees, and the object telecentricity design can effectively solve the problem of perspective image distortion and can obtain a distortion-free high-resolution image; the telecentricity of the image space is not more than 0.05 degrees, and the adjustment precision of the CCD or CMOS camera and the optical system is reduced. The distortion of the full field of view is not more than 0.015%, so that the measurement error caused by distortion is eliminated, and the measurement accuracy of the optical system is improved. The optical index of the lens can show that the total length of the optical system is only 195mm, and only 8 lenses are adopted to achieve diffraction limit imaging quality, so that the optical system has the advantages of small volume, light weight and low manufacturing cost, and is favorable for popularization in the market.
The above embodiments are described in detail for the essence of the present invention, but the scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that many improvements and modifications can be made without departing from the spirit of the invention, and it should be noted that these improvements and modifications fall within the scope of the appended claims.
Claims (3)
1. A large numerical aperture near infrared object image bilateral telecentric optical system is characterized in that: the optical lens comprises a first lens, a second lens, a beam splitting prism, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged in the propagation direction of light rays from an image plane to an object plane;
the first lens and the second lens form a front lens group, and the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens form a rear lens group;
the focal power of the front lens group is phi A, the focal power of the rear lens group is phi C, the focal power of the system is phi,
the ratio of phia to phisatisfies the following condition:
1.8φA/φ/>2.2；
the ratio of C to phi satisfies the following condition:
9.1φC/φ/>10.5；
the curvature radius of the front surface of the first lens is 32.863mm, the curvature radius of the rear surface of the first lens is-55.462 mm, the center thickness of the first lens is 4.2mm, and the light transmission caliber of the first lens is phi 16.8mm; the curvature radius of the front surface of the second lens is-24.588 mm, the curvature radius of the rear surface of the second lens is 14.602mm, the center thickness of the second lens is 2.5mm, and the light-transmitting aperture of the second lens is phi 12.2mm; the curvature radius of the front surface of the third lens is-468.981 mm, the curvature radius of the rear surface of the third lens is-52.485 mm, the center thickness of the third lens is 8.7mm, and the light-transmitting aperture of the third lens is phi 52.3mm; the curvature radius of the front surface of the fourth lens is 140.698mm, the curvature radius of the rear surface of the fourth lens is-162.111 mm, the center thickness of the fourth lens is 6.7mm, and the light transmission caliber of the fourth lens is phi 50.2mm; the curvature radius of the front surface of the fifth lens is-66.202 mm, the curvature radius of the rear surface of the fifth lens is 39.859mm, the center thickness of the fifth lens is 2.5mm, and the light-transmitting aperture of the fifth lens is phi 48.2mm; the curvature radius of the front surface of the sixth lens is 39.859mm, the curvature radius of the rear surface of the sixth lens is-185.774 mm, the center thickness of the sixth lens is 11.9mm, and the light transmission caliber of the sixth lens is phi 48.2mm; the curvature radius of the front surface of the seventh lens is 50.225mm, the curvature radius of the rear surface of the seventh lens is-578.471, the center thickness of the seventh lens is 9.6mm, and the light transmission caliber of the seventh lens is phi 49.1mm; the curvature radius of the front surface of the eighth lens is 23.513mm, the curvature radius of the rear surface of the eighth lens is 35.756mm, the center thickness of the eighth lens is 5.1mm, and the light transmission caliber of the eighth lens is phi 29.2mm;
and the fifth lens and the sixth lens form a double-cemented lens.
2. The large numerical aperture near infrared object image double-sided telecentric optical system according to claim 1, wherein: the first lens is a biconvex positive focal power lens, the second lens is a biconcave negative focal power lens, the third lens is a meniscus positive focal power lens, the fourth lens is a biconvex positive focal power lens, the fifth lens is a biconcave negative focal power lens, the sixth lens is a biconvex positive focal power lens, the seventh lens is a biconvex positive focal power lens, and the eighth lens is a meniscus positive focal power lens.
3. The large numerical aperture near infrared object image double-sided telecentric optical system according to claim 1, wherein: the first lens is made of heavy lanthanum flint glass material, the second lens is made of flint glass material, the third lens is made of dense crown glass material, the fourth lens is made of crown glass material, the fifth lens is made of flint glass material, the sixth lens is made of dense crown glass material, the seventh lens is made of heavy lanthanum flint glass material, and the eighth lens is made of heavy lanthanum flint glass material.
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