CN112415713B - Long-focus high-uniformity visual inspection system and manufacturing method thereof - Google Patents
Long-focus high-uniformity visual inspection system and manufacturing method thereof Download PDFInfo
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- CN112415713B CN112415713B CN202011316200.XA CN202011316200A CN112415713B CN 112415713 B CN112415713 B CN 112415713B CN 202011316200 A CN202011316200 A CN 202011316200A CN 112415713 B CN112415713 B CN 112415713B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000011179 visual inspection Methods 0.000 title claims description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 239000011521 glass Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000005308 flint glass Substances 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 6
- 239000005357 flat glass Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000005331 crown glasses (windows) Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims 1
- 238000005286 illumination Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 9
- 238000003384 imaging method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000012634 optical imaging Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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Abstract
The invention provides a machine vision system of a long-focus high-uniformity vision detection system and a manufacturing method thereof, wherein a front lens group A, a diaphragm, a rear lens group B and plate protection glass are sequentially arranged in an optical system of a lens along the incidence direction of light rays from left to right, and the front lens group A comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power, which are sequentially arranged. The machine vision system has the characteristics of large focal length, short working distance, light structure, large light transmission, high and uniform illumination intensity and the like, and can be matched with 2/3' 500 ten thousand-pixel CMOS.
Description
Technical Field
The invention relates to a machine vision system of a long-focus high-uniformity vision detection system and a manufacturing method thereof.
Background
At present, a plurality of detection lenses similar to the detection lenses have been put into use, but other lenses have a series of problems of small light transmission, complex structure, low illumination, non-uniformity, poor near-range image quality, too high cost or too low edge MTF, and the like, so that the detection requirements of the prior art are difficult to meet, and the lenses are difficult to popularize effectively.
Disclosure of Invention
The invention improves the problems, namely the technical problems to be solved by the invention are that the existing detection lens has the problems of small light transmission, complex structure, low and uneven illumination, poor near-range image quality and the like.
The specific embodiments of the invention are: a front lens group A, a diaphragm, a rear lens group B and plate protection glass are sequentially arranged in an optical system of the lens along the incidence direction of light rays from left to right, and the front lens group A comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power, which are sequentially arranged. The rear lens group B sequentially comprises a crescent lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and plate protection glass.
Further, the air distance from the front group of crescent lens A1 to crescent lens A2 is 0.1mm, the air distance from crescent lens A3 to diaphragm is 2.2 mm, the air distance from diaphragm to crescent lens B1 is 3.845 mm, the air distance from biconvex lens B2 to biconvex lens B3 is 0.1mm, the air distance from crescent lens B4 to crescent lens B5 is 1.617 mm, and the distance from crescent lens B5 to protective plate glass D is 10.305 mm.
Further, the crescent lens A2 with positive focal power and the crescent lens A3 with negative focal power are combined into a front group of bonding sheets through optical glue, and materials of the crescent lens A and the crescent lens A3 are respectively dense crown glass and heavy lanthanum glass; the biconcave lens B1 with negative focal power and the biconvex lens B2 with positive focal power are combined into a rear group bonding sheet through optical glue, the biconcave lens B1 and the biconvex lens B2 are respectively made of flint glass and lanthanum flint glass, the focal power of the front group bonding sheet is positive, and the focal power of the rear group bonding sheet is negative.
Further, the air distance between the biconvex lens B3 and the crescent lens B4 is 2.17-mm-17.18 mm.
Further, the aperture value corresponding to the diaphragm is 2.8-16; the focal length is 35mm, and the optical distortion is less than or equal to 1%.
Further, when the object distance is 500mm, the total optical length TTL of the lens is less than or equal to 43mm, the optical back focus is more than or equal to 10mm, and the illuminance is more than 95%.
Further, let the total focal length of the lens be f, from left to right, crescent lens A1, crescent lens A2, crescent lens A3, crescent lens B1, biconvex lens B2, biconvex lens B3, crescent lens B4, and crescent lens B5 have focal lengths f1, f2, f3, f4, f5, f6, f7, and f8 in order, then there are:
0.4＜|f1/f|＜1.3；0.5＜|f2/f|＜1.7；
0.1＜|f3/f|＜0.5；0.8＜|f4/f|＜1.6；
0.5＜|f5/f|＜1.2；0.8＜|f6/f|＜1.9；
0.4＜|f7/f|＜1.5；0.5＜|f8/f|＜1.2；
crescent lens A1, crescent lens A2, crescent lens A3 from left to right. The refractive indexes of the crescent lens B1, the biconvex lens B2, the biconvex lens B3, the crescent lens B4 and the crescent lens B5 are n1, n2, n3, n4, n5, n6, n7 and n8 in sequence, and then the refractive indexes are as follows:
1.70＜n1＜1.90；1.55＜n2＜1.62；
1.73＜n3＜1.90；1.52＜n4＜1.73；
1.65＜n5＜1.80；1.73＜n6＜1.95；
1.59＜n7＜1.73；1.78＜n8＜1.92；
the invention also comprises a manufacturing method of the long-focus high-uniformity visual inspection system, which is characterized in that a front lens group A, a diaphragm, a rear lens group B and plate protection glass are sequentially arranged in the optical system of the lens along the incidence direction of light rays from left to right, wherein the front lens group A comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power, which are sequentially arranged. The rear lens group B sequentially comprises a crescent lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and a flat protection glass D;
the air distance from the front group of crescent lenses A1 to the crescent lenses A2 is 0.1mm, the air distance from the crescent lenses A3 to the diaphragm is 2.2 mm, the air distance from the diaphragm to the crescent lenses B1 is 3.845 mm, the air distance from the biconvex lenses B2 to the biconvex lenses B3 is 0.1mm, the air distance from the crescent lenses B4 to the crescent lenses B5 is 1.617 mm, and the distance from the crescent lenses B5 to the protection flat glass D is 10.305 mm.
Compared with the prior art, the invention has the following beneficial effects: the structure of the invention is further deformed and optimized on the basis of a classical double Gaussian structure. The symmetrical characteristic of the double Gaussian structure has obvious effect on improving aberration and advanced chromatic aberration, the curvature of the thinner lens can correct Petzval field curvature and spherical aberration according to the double Gaussian aberration characteristic, and the curvature change of the thick lens can improve the field area and distortion of the system, so that two lenses are added after double Gaussian in sequence, the primary chromatic aberration can be further improved, the vertical axis aberration is limited, and the air interval can be adjusted to improve the illumination and field area. The structure of the invention adopts a structure with separated positive and negative focal power to realize high-illumination large-light-passing, fully utilizes the characteristics of the diaphragm to change the surface shape, can achieve the aim of adjusting the incidence angle and the emergent angle formed by light on each surface, and can well balance the focal power by matching with the adjustment of refractive index and the control of vignetting, thereby improving illumination and achieving high uniformity. The two glued sheets in the structure not only have remarkable effect on chromatic aberration, but also are helpful for correcting the lens cra so as to adapt to CMOS.
Drawings
Fig. 1 is a diagram of an optical system according to an embodiment of the present invention.
Fig. 2 is a graph of modulation transfer functions of an optical system.
Fig. 3 is an illuminance of an optical system.
Fig. 4 is a graph of field curvature and distortion of an optical system.
In the figure: c-diaphragm, 1-crescent lens A1, 2-crescent lens A2, 3-crescent lens A3, 4-crescent lens B1, 5-biconvex lens B2, 6-biconvex lens B3, 7-crescent lens B4, 8-crescent lens B5, D-plate protection glass.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1 to 4, in an optical system of the lens, a front lens group a, a diaphragm, a rear lens group B and a flat plate protective glass D are sequentially arranged along the incident direction of light rays from left to right, wherein the front lens group a comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power, which are sequentially arranged. The rear lens group B sequentially comprises a crescent lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and a flat protection glass D.
In this embodiment, the air distance from the front group of crescent lenses A1 to A2 is 0.1mm, the air distance from the crescent lens A3 to the diaphragm is 2.2 mm, the air distance from the diaphragm to the crescent lens B1 is 3.845 mm, the air distance from the biconvex lens B2 to the biconvex lens B3 is 0.1mm, the air distance from the crescent lens B4 to the crescent lens B5 is 1.617 mm, and the distance from the crescent lens B5 to the protection plate glass D is 10.305 mm.
In this embodiment, the crescent lens A2 with positive focal power and the crescent lens A3 with negative focal power are combined into the front group of bonding sheets by optical glue, and the materials of the crescent lens a and the crescent lens A3 are respectively dense crown glass and heavy lanthanum glass; the biconcave lens B1 with negative focal power and the biconvex lens B2 with positive focal power are combined into a rear group bonding sheet through optical glue, the biconcave lens B1 and the biconvex lens B2 are respectively made of flint glass and lanthanum flint glass, the focal power of the front group bonding sheet is positive, and the focal power of the rear group bonding sheet is negative.
In this embodiment, the air distance between the biconvex lens B3 and the crescent lens B4 is between 2.17. 2.17 mm and 17.18 mm.
In the embodiment, the aperture value corresponding to the diaphragm is 2.8-16; the focal length is 35mm, and the optical distortion is less than or equal to 1%.
In the embodiment, when the object distance is 500mm, the total optical length TTL of the lens is less than or equal to 43mm, the optical back focus is more than or equal to 10mm, and the illuminance is more than 95%.
In this embodiment, the parameters of each lens are as follows, the following radius of curvature, thickness, and outside diameter units are all mm: the serial numbers of the surfaces are the serial numbers of the lenses from left to right in the drawing, and the bonding surfaces are the same surface:
in this embodiment, as shown in fig. 1, the optical system is composed of 8 spherical lenses, and a front lens group a, a diaphragm C, a rear lens group B and a plate protection glass D are sequentially disposed in the optical system of the lens along the incident direction of light from left to right, where the front lens group a includes a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power. The rear lens group B sequentially comprises a crescent lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and a flat protection glass D. The effect of the air gap of the lens behind the double gauss is similar to that in a gauss telescope objective, i.e. the amount of change in the light height of the marginal rays is amplified by this air gap, and blue light drops more than red light due to the undercorrected chromatic aberration of the first element on the crescent lens B4 and crescent lens B5, thus affecting the chromatic aberration (having a compensating effect), which can also explain partly the reason that the abbe numbers of the latter two elements in the design are lower. The structure of the invention adopts a structure with separated positive and negative focal power to realize high illumination and large light transmission, has small system distortion, fully reduces the image distortion degree, and can provide a good detection picture for industrial detection.
The optical imaging lens provided by the application comprises a plurality of lenses, such as a first lens to an eighth lens. Through reasonably setting the interrelationship between the total effective focal length of the optical imaging lens and the maximum field angle of the optical imaging lens, and optimizing the focal power and the surface shape of each lens, the optical imaging lens is reasonably matched with each other, so that the optical imaging lens is miniaturized, thinned and has a larger imaging surface.
By analyzing the trend of the light, the characteristics of the diaphragm are fully utilized to change the surface shape, so that the incidence angle and the emergent angle formed by the light on each surface can be adjusted, the focal power can be well balanced by matching with the adjustment of the refractive index, the sensitivity of the Monte Carlo distributed type is reduced, and the optical system can withstand the deviation caused by the processing or the assembly of structures, processes and the like, and has the production capacity.
In the embodiment, the lens adopts a full glass spherical lens, so that the performance of the optical system is ensured, the material cost is low, and the lens is easy to process. By adopting a grouping focusing mode, wide object distance imaging is realized by changing the air distance from the lenticular lens B3 to the lenticular lens B4, so that excellent imaging quality under the object distance from 0.08m to infinity is ensured, the distortion can be controlled within 1% in a main working interval, and the edge high image quality can be ensured in the outermost field (ϕ 11). The CRA of the system is smaller than 10 degrees, so that the CRA can be well matched with an image sensor, and the illumination of the system is well ensured. The system is suitable for various temperatures, has no obvious shift of the focal point when being used in the environment of-20 to 60 ℃, and can ensure the normal work.
As can be seen from fig. 2, the MTF value of the optical system is between 0.4 and 0.6 at 150lp/mm, and the lens has excellent image resolution capability and is suitable for CMOS with 500 ten thousand pixels.
FIG. 3 is an illuminance table of an optical system, which can see that the illuminance of the whole system is more than 95%, thereby ensuring the uniformity of the imaging illuminance
As can be seen from FIG. 4, the optical distortion of the optical system is only about 1%, so that the machine vision optical system will be labor-saving
The industrial detection brings high pattern reduction degree and does not have the phenomenon of edge deformation.
In this embodiment, the lens can ensure the imaging quality of the object distance from 0.08mm to infinity, and the imaging performance is optimal when the object distance is between 200 mm and 1000 mm. The optical system is widely applicable to detection environments of various conditions, the optical index shows that the total length of the optical system is small, the application range is wider, the caliber of front and rear groups of lenses is smaller, the size of a structure is reduced, and the lens is smaller; the optical system fully adopts the combination of low-price crown glass and flint glass, and fully balances the focal power of the system, so that the system can clearly image in a high-temperature and low-temperature environment.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (4)
1. The long-focus high-uniformity visual detection system is characterized in that a front lens group A, a diaphragm, a rear lens group B and plate protection glass are sequentially arranged in an optical system of a lens along the incidence direction of light rays from left to right, wherein the front lens group A comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power;
the rear lens group B sequentially comprises a biconcave lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and a flat protection glass D; the optical elements having optical power are only the above 8 lenses;
the air distance from the front group of crescent lenses A1 to the crescent lenses A2 is 0.1mm, the air distance from the crescent lenses A3 to the diaphragm is 2.2 mm, the air distance from the diaphragm to the biconcave lens B1 is 3.845 mm, the air distance from the biconvex lens B2 to the biconvex lens B3 is 0.1mm, the air distance from the crescent lenses B4 to the crescent lenses B5 is 1.617 mm, and the distance from the crescent lenses B5 to the protection flat glass D is 10.305 mm;
the crescent lens A2 with positive focal power and the crescent lens A3 with negative focal power are combined into a front group of bonding sheets through optical glue, and materials of the crescent lens A and the crescent lens A3 are respectively crown glass and lanthanum glass; the biconcave lens B1 with negative focal power and the biconvex lens B2 with positive focal power are combined into a rear group of bonding sheets through optical glue, the biconcave lens B1 and the biconvex lens B2 are respectively made of flint glass and lanthanum flint glass, the focal power of the front group of bonding sheets is positive, and the focal power of the rear group of bonding sheets is negative;
the air distance between the biconvex lens B3 and the crescent lens B4 is 2.17-mm-17.18 mm.
2. The long-focus high-uniformity visual inspection system according to claim 1, wherein said diaphragm has an aperture value of 2.8-16; the focal length is 35mm, and the optical distortion is less than or equal to 1%.
3. The long-focus high-uniformity visual inspection system according to claim 1, wherein the total optical length TTL of the lens is less than or equal to 43mm, the optical back focus is less than or equal to 10mm, and the illuminance is more than 95% when the object distance is 500 mm.
4. The method for manufacturing a long-focal-length high-uniformity visual inspection system according to claim 1, wherein a front lens group A, a diaphragm, a rear lens group B and plate protection glass are sequentially arranged in the optical system of the lens from left to right along the incidence direction of light rays, the front lens group A comprises a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power, which are sequentially arranged;
the rear lens group B sequentially comprises a biconcave lens B1 with negative focal power, a biconvex lens B2 with positive focal power, a biconvex lens B3 with positive focal power, a crescent lens B4 with positive focal power, a crescent lens B5 with negative focal power and a flat protection glass D;
the air distance from the front group of crescent lenses A1 to the crescent lenses A2 is 0.1mm, the air distance from the crescent lenses A3 to the diaphragm is 2.2 mm, the air distance from the diaphragm to the biconcave lens B1 is 3.845 mm, the air distance from the biconvex lens B2 to the biconvex lens B3 is 0.1mm, the air distance from the crescent lenses B4 to the crescent lenses B5 is 1.617 mm, and the distance from the crescent lenses B5 to the protection flat glass D is 10.305 mm.
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| JP2008146016A (en) * | 2006-11-15 | 2008-06-26 | Olympus Imaging Corp | Zoom lens and electronic imaging apparatus using the same |
| JP2010033061A (en) * | 2009-09-09 | 2010-02-12 | Olympus Corp | Imaging lens, and imaging lens device using the same |
| JP2012083789A (en) * | 2012-01-30 | 2012-04-26 | Olympus Corp | Microscope objective lens |
| JP2015090411A (en) * | 2013-11-06 | 2015-05-11 | 京セラオプテック株式会社 | Zoom lens |
| WO2017221949A1 (en) * | 2016-06-21 | 2017-12-28 | 株式会社ｎｉｔｔｏｈ | Image-capturing optical system and image-capturing device |
| CN107015349A (en) * | 2017-04-18 | 2017-08-04 | 凯迈（洛阳）测控有限公司 | A kind of low-light level television imaging relaying coupling optical system |
| CN106990517A (en) * | 2017-05-22 | 2017-07-28 | 凯迈（洛阳）测控有限公司 | A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system |
| CN107144941A (en) * | 2017-07-03 | 2017-09-08 | 福建福光股份有限公司 | A kind of big thang-kng of 5.9mm day and night confocal camera lens |
| WO2019100868A1 (en) * | 2017-11-22 | 2019-05-31 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108845417A (en) * | 2018-06-29 | 2018-11-20 | 福建福光股份有限公司 | One kind disappears parallax machine vision optical system |
| CN110716298A (en) * | 2019-10-29 | 2020-01-21 | 福建福光天瞳光学有限公司 | 1.1-inch large-target-surface 16-mm-focus high-definition low-distortion industrial lens and manufacturing method thereof |
| CN214795378U (en) * | 2020-11-22 | 2021-11-19 | 福建福光天瞳光学有限公司 | Long-focus high-uniformity visual detection system |
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