CN111679400B - Detection lens only using three domestic optical materials and design method and application thereof - Google Patents
Detection lens only using three domestic optical materials and design method and application thereof Download PDFInfo
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- CN111679400B CN111679400B CN202010575450.9A CN202010575450A CN111679400B CN 111679400 B CN111679400 B CN 111679400B CN 202010575450 A CN202010575450 A CN 202010575450A CN 111679400 B CN111679400 B CN 111679400B
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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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
- G01M11/0257—Testing optical properties by measuring geometrical properties or aberrations by analyzing the image formed by the object to be tested
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/04—Optical benches therefor
-
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
Abstract
The invention discloses a detection lens only using three domestic optical materials, a design method and application thereof, wherein the detection lens comprises ten lenses of six lens groups which are sequentially arranged, the first lens group is a first lens with positive focal power, the second lens group is a first cemented lens with positive focal power, the third lens group is a second cemented lens with negative focal power, the fourth lens group is a third cemented lens with negative focal power, the fifth lens group is a fourth cemented lens with positive focal power, and the sixth lens group is a sixth lens with positive focal power. The detection lens can obviously reduce the processing cost, has stronger tolerance performance, high resolution, high contrast, good chromatic aberration correction effect and strong universality.
Description
Technical Field
The invention relates to the technical field of non-contact precision detection, in particular to a detection lens only using three domestic optical materials and a design method and application thereof.
Background
With the rapid development of the automation industry, the machine vision technology is widely applied to the aspect of product quality detection. The optical lens is used as a core component of machine vision and plays the role of eyes, so the imaging quality of the lens is very important. In large-scale industrial production, the machine vision replaces the artificial vision, so that the product quality and the production efficiency can be greatly improved.
In industrial detection, the non-contact precision detection of complex parts has high requirements on detection lenses. At present, the most advanced machine vision technology is still mastered by countries such as Europe, America, Japan and the like; china is in the period of technical transformation, great demand is placed on a machine vision technology, few and few lens designs aiming at machine vision are provided, high-end industrial lenses are mostly introduced into foreign products, the foreign high-end industrial lenses usually need more than 10 optical materials, the average unit price of the materials is more than 300 yuan/kg, the structure is complex, the global surface optical glass lens structure generally needs about 10 lens groups and the number of the lenses is more than 15, most of the lens structures within 10 lenses contain a plurality of aspheric lenses, the cost is very high, and the manufacturing cost of the detection equipment is high.
The related technical indexes of the related domestic detection lens hardly meet the use requirements of related detection equipment, the industrial lens is a key part for image acquisition, the performance of machine vision detection equipment is determined, and the quality of the industrial lens directly influences the identification and detection of products, so that the designed high-cost-performance domestic industrial detection lens has high application value, has low cost and is easy to process, and the performance index meets the requirements of the related detection equipment.
Disclosure of Invention
The invention aims to provide a detection lens only using three domestic optical materials, a design method and application thereof, which can solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the detection lens only using three domestic optical materials comprises ten lenses of six lens groups which are sequentially arranged, wherein the first lens group is a first lens with positive focal power, the second lens group is a first cemented lens with positive focal power, the third lens group is a second cemented lens with negative focal power, the fourth lens group is a third cemented lens with negative focal power, the fifth lens group is a fourth cemented lens with positive focal power, and the sixth lens group is a sixth lens with positive focal power.
Further, a diaphragm is arranged between the third lens group and the fourth lens group.
Furthermore, the refractive index of the optical materials of the first lens group (101) and the sixth lens group (106) is 1.64, and the abbe number is 55.47, the second lens group (102) and the fifth lens group (105) are cemented lens groups composed of two optical materials with refractive index of 1.64, abbe number 55.47, refractive index of 1.61, and abbe number 43.88, and the third lens group (103) and the fourth lens group (104) are cemented lens groups composed of two optical materials with refractive index of 1.61, abbe number 55.14, refractive index of 1.61, and abbe number 43.88.
Further, the lens structure adopts a refraction type light path.
The invention relates to a design method of a detection lens only using three domestic optical materials, which firstly sets the basic optical parameters of the whole system, the basic optical parameters include object height, working distance, working wavelength and entrance pupil diameter, while an equivalent parallel plate glass is inserted after the back group, is used for simulating the flat glass inside the imaging device, and adopts a design optimization method combining manpower and design software on the basis, the system is reformed and optimized, and when the system is reformed and optimized, the diaphragm is ensured to be positioned between the front group and the rear group and is closer to the rear group, during later stage design optimization, boundary light rays and characteristic light ray positions are positioned by combining calculation of manually subdivided apertures and fields of view, the interrelation of various aberrations in the lens is found, the aberrations are reasonably matched, and then the lens structure is optimized until the lens structure meets related technical indexes.
Further, the thickness of the equivalent parallel plate glass is determined according to an imaging device.
The invention relates to a detection lens only using three domestic optical materials, which can be used for a high-resolution industrial camera with a chip size of 1/4-1.1 inches after the front and rear groups of air intervals of a lens structure and the curvature radius of each lens are properly adjusted.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the detection lens only using the three domestic optical materials, on the premise that the imaging quality is not lower than that of the existing other lens structures, only the three domestic low-cost optical materials are used, the average unit price is within 100 yuan/kg, the whole structure is simple, the processing difficulty is low, the processing cost can be obviously reduced, and the tolerance performance is strong;
2. the detection lens only using three domestic optical materials has high resolution, low distortion, high contrast and good chromatic aberration correction effect;
3. the detection lens only using three domestic optical materials has strong universality, and the use requirements of the high-resolution industrial camera with the chip size of 1/4-1.1 inches can be met by properly adjusting the air interval between the front group and the rear group of the lens structure and the curvature radius of each lens.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a schematic structural diagram of a detection lens using only three home-made optical materials according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of ray tracing according to embodiment 1 of the present invention;
FIG. 3 is a graph showing curvature of field and distortion in example 1 of the present invention;
FIG. 4 is a MTF graph of example 1 of the present invention.
Description of reference numerals: 101. a first lens group; 102. a second lens group; 103. a third lens group; 104. a fourth lens group; 105. a fifth lens group; 106. a sixth lens group.
Detailed Description
Example 1
As shown in fig. 1 to 4, the inspection lens using only three domestic optical materials according to embodiment 1 includes ten lens elements in the six lens groups, the first lens group 101 is a first cemented lens with positive focal power, the second lens group 102 is a first cemented lens with positive focal power, the third lens group 103 is a second cemented lens with negative focal power, the fourth lens group 104 is a third cemented lens with negative focal power, the fifth lens group 105 is a fourth cemented lens with positive focal power, and the sixth lens group 106 is a sixth lens with positive focal power.
Wherein a diaphragm is arranged between the third lens group 103 and the fourth lens group 104.
Specifically, the refractive index of the optical materials of the first lens group (101) and the sixth lens group (106) is 1.64, and the abbe number is 55.47, the second lens group (102) and the fifth lens group (105) are cemented lens groups composed of two optical materials with a refractive index of 1.64, an abbe number of 55.47, a refractive index of 1.61, and an abbe number of 43.88, and the third lens group (103) and the fourth lens group (104) are cemented lens groups composed of two optical materials with a refractive index of 1.61, an abbe number of 55.14, a refractive index of 1.61, and an abbe number of 43.88.
The detection lens only using three domestic optical materials in the embodiment 1 only uses three domestic low-cost optical materials on the premise that the imaging quality is not lower than that of other existing lens structures, the average unit price is within 100 yuan/kg, the whole structure is simple, the processing difficulty is low, the processing cost can be obviously reduced, the tolerance performance is strong, and meanwhile, the detection lens has the advantages of high resolution, low distortion, high contrast and good chromatic aberration correction effect.
The inspection lens of this embodiment 1, which uses only three domestic optical materials, can be used for non-contact precision inspection of complex parts, such as: precision mechanical component inspection, electronic component inspection (resistors, transistors, IC circuits, etc.), glass and pharmaceutical container inspection, and plastic part inspection (rubber seal rolls, rubber oil seals, O-rings, etc.).
In this embodiment 1, the basic lens parameters are as follows:
the image height is 11mm, the object height is 22mm, the working distance is more than 100mm, the distortion is less than 0.003%, the length is 135mm, and the resolution is more than 1000 ten thousand pixels.
Example 2
According to the design method of the detection lens only using three domestic optical materials in the embodiment 2, firstly, basic optical parameters of the whole system are set in software, wherein the basic optical parameters comprise object height, working distance, working wavelength, entrance pupil diameter and the like, and meanwhile, equivalent parallel plate glass with a certain thickness is inserted behind a rear group and is used for simulating plate glass inside an imaging device, so that the designed lens can ensure the imaging quality in use; in order to eliminate the distance inconsistency between the measured object (or the CCD chip) and the lens and ensure the measurement accuracy, the exit and entrance pupil positions of the optical system need to be effectively controlled.
On the basis, a design optimization method combining manpower and design software is adopted to reconstruct and optimize the system. When the optical diaphragm is transformed and optimized, the optical diaphragm is positioned between the front group and the rear group and is closer to the rear group, so that the optical path difference of each field, each aperture and each wave surface of the rear group can be ensured to be smaller, and further optimization and correction of aberration are facilitated. During later stage design optimization, the positions of boundary rays and characteristic rays are accurately positioned by combining with the accurate calculation of manually subdivided apertures and fields of view, the interrelation of various aberrations in the lens is found, the aberrations are reasonably matched, and continuous optimization is performed until the lens structure meets related technical indexes, so that the lens has better aberration quality, smaller distortion and good manufacturability. Attention is paid to updating and adjusting various optimization target values at any time during the optimization process.
Wherein the thickness of the equivalent parallel plate glass is determined according to the imaging device.
When the equivalent focal length of the lens is 1mm, the structural parameters are as follows:
example 3
According to the application of the inspection lens of this embodiment 3 using only three domestic optical materials, the lens structure of this embodiment can be used for high-resolution industrial cameras with a chip size of 1/4-1.1 inches by properly adjusting the air gap between the front and rear groups and the curvature radius of each lens in the lens structure of embodiment 1.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A detection lens only using three domestic optical materials is characterized in that: the optical lens comprises ten lenses of six lens groups which are sequentially arranged, wherein the first lens group (101) is a first lens with positive focal power, the second lens group (102) is a first cemented lens with positive focal power, the third lens group (103) is a second cemented lens with negative focal power, the fourth lens group (104) is a third cemented lens with negative focal power, the fifth lens group (105) is a fourth cemented lens with positive focal power, and the sixth lens group (106) is a sixth lens with positive focal power;
the refractive index of the optical materials of the first lens group (101) and the sixth lens group (106) is 1.64, the abbe number is 55.47, the second lens group (102) and the fifth lens group (105) are both cemented lens groups composed of two optical materials with refractive index of 1.64, abbe number of 55.47, refractive index of 1.61 and abbe number of 43.88, and the third lens group (103) and the fourth lens group (104) are cemented lens groups composed of two optical materials with refractive index of 1.61, abbe number of 55.14, refractive index of 1.61 and abbe number of 43.88.
2. The inspection lens using only three domestic optical materials as claimed in claim 1, wherein: a diaphragm is arranged between the third lens group (103) and the fourth lens group (104).
3. The inspection lens using only three domestic optical materials as claimed in claim 1, wherein: wherein, the lens structure adopts a refraction type light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010575450.9A CN111679400B (en) | 2020-06-22 | 2020-06-22 | Detection lens only using three domestic optical materials and design method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010575450.9A CN111679400B (en) | 2020-06-22 | 2020-06-22 | Detection lens only using three domestic optical materials and design method and application thereof |
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| Publication Number | Publication Date |
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| CN111679400A CN111679400A (en) | 2020-09-18 |
| CN111679400B true CN111679400B (en) | 2022-05-10 |
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Citations (8)
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| JP2006119159A (en) * | 2004-09-30 | 2006-05-11 | Olympus Corp | .objective lens with correction mechanism |
| JP2009294518A (en) * | 2008-06-06 | 2009-12-17 | Nikon Corp | Objective lens for microscope |
| JP2012003015A (en) * | 2010-06-16 | 2012-01-05 | Ricoh Co Ltd | Imaging lens, camera device, and portable information terminal device |
| CN102331618A (en) * | 2010-06-16 | 2012-01-25 | 株式会社理光 | Image-forming lens, and camera device and portable information terminal device with the image-forming lens |
| JP2012022300A (en) * | 2010-06-16 | 2012-02-02 | Ricoh Co Ltd | Imaging lens, camera device and portable information terminal device |
| CN107402434A (en) * | 2017-08-15 | 2017-11-28 | 秦皇岛视听机械研究所 | A kind of ultra-large vision field angle optical lens of three kinds of low-cost optical materials of use |
| CN209690601U (en) * | 2019-04-12 | 2019-11-26 | 奥普特视觉科技(苏州)有限公司 | A kind of linear array camera lens |
| CN210348042U (en) * | 2019-07-18 | 2020-04-17 | 广东奥普特科技股份有限公司 | High-resolution lens |
-
2020
- 2020-06-22 CN CN202010575450.9A patent/CN111679400B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006119159A (en) * | 2004-09-30 | 2006-05-11 | Olympus Corp | .objective lens with correction mechanism |
| JP2009294518A (en) * | 2008-06-06 | 2009-12-17 | Nikon Corp | Objective lens for microscope |
| JP2012003015A (en) * | 2010-06-16 | 2012-01-05 | Ricoh Co Ltd | Imaging lens, camera device, and portable information terminal device |
| CN102331618A (en) * | 2010-06-16 | 2012-01-25 | 株式会社理光 | Image-forming lens, and camera device and portable information terminal device with the image-forming lens |
| JP2012022300A (en) * | 2010-06-16 | 2012-02-02 | Ricoh Co Ltd | Imaging lens, camera device and portable information terminal device |
| CN107402434A (en) * | 2017-08-15 | 2017-11-28 | 秦皇岛视听机械研究所 | A kind of ultra-large vision field angle optical lens of three kinds of low-cost optical materials of use |
| CN209690601U (en) * | 2019-04-12 | 2019-11-26 | 奥普特视觉科技(苏州)有限公司 | A kind of linear array camera lens |
| CN210348042U (en) * | 2019-07-18 | 2020-04-17 | 广东奥普特科技股份有限公司 | High-resolution lens |
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| CN111679400A (en) | 2020-09-18 |
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