CN114924396B - Large target surface double telecentric lens - Google Patents
Large target surface double telecentric lens Download PDFInfo
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- CN114924396B CN114924396B CN202210554077.8A CN202210554077A CN114924396B CN 114924396 B CN114924396 B CN 114924396B CN 202210554077 A CN202210554077 A CN 202210554077A CN 114924396 B CN114924396 B CN 114924396B
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- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 11
- 229910052788 barium Inorganic materials 0.000 claims description 8
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000005331 crown glasses (windows) Substances 0.000 claims description 8
- 238000001429 visible spectrum Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 3
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 125000005647 linker group Chemical group 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012360 testing method 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
- G02B13/22—Telecentric objectives or lens systems
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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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- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention belongs to the technical field of optical lenses, and discloses a large-target-surface double-telecentric lens. The double telecentric lens comprises a first lens group, an aperture diaphragm and a second lens group, wherein the first lens group consists of five lenses, and the following steps are sequentially carried out along a light path: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially a biconvex lens, a concave-convex lens, a convex-concave lens and a biconcave lens; the second lens group consists of five lenses, and the following steps are sequentially carried out along the light path: the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are sequentially a concave-convex lens, a biconvex lens, a convex-concave lens, a concave-convex lens and a concave-convex lens, and the ninth lens and the tenth lens are glued into a second gluing group. The double telecentric lens has the characteristics of visible spectrum, double telecentricity of object and image, large target surface of the detector, adjustable object distance and the like; the requirements of the optical system on the large detector target and the requirements of various object distances can be met.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a large-target-surface double-telecentric lens.
Background
The machine vision system uses a machine to replace human eyes to measure and judge. Optical lenses are important components in machine vision systems, and with the development of technology, requirements for industrial lenses are more and more accurate. Compared with the common imaging lens, the double telecentric lens has a unique light path structure, and can effectively correct the parallax of the common imaging lens, so that the imaging multiplying power can be kept unchanged within a certain object distance range, and the double telecentric lens is applied to various machine vision detection systems.
The object space telecentric lens in the current market has more large multiplying power, but the double telecentric lens with high performance and adjustable object distance in the current market has very few. The double telecentric lens plays a very important role in precise measurement, and with the continuous development of machine vision, the performance requirement on the double telecentric lens is higher and higher.
Disclosure of Invention
In view of the above technical problems in the prior art, an object of the present invention is to provide a large target surface double telecentric lens, which can improve the target surface size of the lens while ensuring telecentricity and distortion rate. The technical scheme adopted by the invention is as follows:
the double telecentric lens with the large target surface sequentially comprises a first lens group, an aperture diaphragm and a second lens group along a light path; wherein:
the first lens group consists of five lenses, and the first lens group comprises the following components in sequence along the light path: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the first lens is a biconvex lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, the fourth lens is a convex-concave lens, and the fifth lens is a biconcave lens;
the aperture diaphragm is positioned between the first lens group and the second lens group;
the second lens group consists of five lenses, and the following steps are sequentially carried out along the light path: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a concave-convex lens, the seventh lens is a biconvex lens, the eighth lens is a convex-concave lens, the ninth lens is a biconvex lens, the tenth lens is a concave-convex lens, and the ninth lens and the tenth lens are glued into a second gluing group.
In a further technical scheme, the fifth lens is formed by gluing two lenses.
In a further aspect, the first lens has an optical power of 0.00815; the focal power of the second lens is-0.00375; the third lens has an optical power of 0.00624; the focal power of the fourth lens is 0.0234; the focal power of the fifth lens is-0.0617; the focal power of the sixth lens is 0.00941; the focal power of the seventh lens is 0.0116; the focal power of the eighth lens is-0.0174; the focal power of the ninth lens is-0.0113; the optical power of the tenth lens is 0.00453; the units are all mm -1 。
In a further technical scheme, the first lens is made of barium crown glass material, the second lens is made of heavy fire glass material, the third lens and the fourth lens are made of barium crown glass material, the fifth lens and the sixth lens are made of heavy fire glass material, and the seventh lens is made of barium crown glass material; the eighth lens is made of heavy fire glass material, the ninth lens is made of barium crown glass material and the tenth lens is made of heavy fire glass material.
The maximum detector diagonal dimension which can be adapted by the double telecentric lens with the structure can reach phi 21.7mm, and the adjustable range of the object distance can be 105-180 mm through the adjustment of the rear working distance. Therefore, the double telecentric lens has the characteristics of large target surface and adjustable object distance.
In the technical scheme of the invention, the lens consists of eleven lenses (the fifth lens is formed by gluing two lenses), and each lens or each lens has special functional emphasis points, so that each parameter of the lens is responsible for the corresponding lens, and the performance parameters of the lens are more optimized. The grouping optimization and the multiple structural design increase the target surface size of the double telecentric lens, and widen the adjustable range of object distances, so that the lens can adapt to wider and more complex working environments and working requirements. In the invention, the relative positions among all lenses of the first lens group are unchanged, the relative positions among all lenses of the second lens group are unchanged, and the distance between the first lens group and the second lens group is adjustable. Adjusting the distance between the first lens group and the second lens group can adjust the object distance of the double telecentric lens.
The second gluing group is double-glued, the two lenses are made of two different glass materials, so that the magnification of an imaged image cannot be changed, and the two glass combinations can mutually counteract distortion caused by the properties of the lenses; the two lenses are coaxial, which allows the light rays to cancel the distortion effects of the lenses themselves to the maximum extent during the injection and ejection. The two groups of lens bonding groups are mainly responsible for balancing lens distortion, and the fifth lens and the second bonding group are matched with each other, so that the distortion of the lenses can be offset to the greatest extent.
The invention has the following beneficial effects:
1. through grouping optimization and multiple structural design, the large target surface and the wide adjustable range of object distance of the double telecentric lens are realized.
2. And the distortion of the double telecentric lens is reduced by adopting lenses made of different glass materials.
Drawings
FIG. 1 is a light path diagram of a preferred embodiment of the present invention;
FIG. 2 is an optical speckle pattern of a preferred embodiment of the present invention;
FIG. 3 is a graph of the modulation function MTF of a preferred embodiment of the present invention;
FIG. 4 is a graph of curvature of field and distortion of a preferred embodiment of the present invention;
wherein 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a fourth lens, 5 is a lens at the front side of the fifth lens, 6 is a lens at the rear side of the fifth lens, 7 is a sixth lens, 8 is a seventh lens, 9 is an eighth lens, 10 is a ninth lens, and 11 is a tenth lens.
Detailed Description
For a further understanding of the present invention, its aspects, features and advantages, reference should be made to the following detailed description of the embodiments, taken in conjunction with the accompanying drawings, in which:
example 1
The optical system with the large target surface and the double telecentric lens provided by the embodiment is shown in fig. 1, and each parameter of the first lens to the tenth lens is shown in the following table:
table 1 list of parameters for eleven lenses of the large target area double telecentric lens of example 1
As shown in fig. 1, the large target surface double telecentric lens provided by the invention mainly comprises a first lens group, an aperture diaphragm and a second lens group, wherein:
the first lens group consists of five lenses, and the first lens group comprises the following components in sequence along the light path: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the first lens is a biconvex lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, the fourth lens is a convex-concave lens, and the fifth lens is a biconcave lens; and the fifth lens is formed by bonding two lenses, and comprises a front side lens and a rear side lens.
The second lens group consists of five lenses, and the following steps are sequentially carried out along the light path: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a concave-convex lens, the seventh lens is a biconvex lens, the eighth lens is a convex-concave lens, the ninth lens is a biconvex lens, the tenth lens is a concave-convex lens, and the ninth lens and the tenth lens are glued into a second gluing group.
An aperture stop is positioned between the first lens group and the second lens group
Wherein the first lens has an optical power of 0.00815; the focal power of the second lens is-0.00375; the third lens has an optical power of 0.00624; the focal power of the fourth lens is 0.0234; the focal power of the fifth lens is-0.0617; the focal power of the sixth lens is 0.00941; the focal power of the seventh lens is 0.0116; the focal power of the eighth lens is-0.0174; the focal power of the ninth lens is-0.0113; the optical power of the tenth lens is 0.00453; the units are all mm -1 。
After test, the working distance of the double telecentric lens of the embodiment is 105mm-180mm, and the working wave band is 486 nm-656 nm.
Fig. 2 is an optical speckle pattern of the above-described double telecentric lens, wherein OBJ is the object field of view, IMA is the image field of view, and units are millimeters. RMS RADIUS represents the root mean square RADIUS of the diffuse speck, GEO RADIUS represents the airy speck RADIUS, all in microns. As shown in FIG. 2, the radius of the Airy spot is 3.057 μm and the root mean square radius is 9.029 μm in the central field of view; when the edge view field is formed, the radius of the Airy spot is 3.953 mu m, the radius of the root mean square is 11.980 mu m, most of the Airy spot is within the radius of the Airy spot, the energy concentration and aberration correction of on-axis and off-axis points are very good, and the ideal resolution is achieved.
Fig. 3 is a graph of the modulation function MTF of the above-mentioned double telecentric lens, wherein the abscissa is the spatial resolution, the unit is line pair/millimeter, the ordinate is the contrast, the value range is 0-1, and ts represents the meridian and sagittal components of MTF under different fields. As shown in fig. 3, the MTF value of each field is greater than 0.2 at 150 line pairs/mm, and the whole MTF curve is compact, so that the lens has high contrast and resolution.
FIG. 4 is a graph of field curvature and distortion for the double telecentric lens described above, wherein the field curvature has a field of view on the ordinate and millimeters on the abscissa; the ordinate of the distortion map is the field of view, and the abscissa is the distortion value. As can be seen from fig. 4, the distortion value of the lens in the full field of view is less than 0.05%, and the lens has a very low distortion value.
Claims (5)
1. The utility model provides a big target surface double telecentric lens, its characterized in that, double telecentric lens comprises first lens group, aperture diaphragm and second lens group along the light path in proper order, wherein:
the first lens group consists of five lenses, and the first lens group comprises the following components in sequence along the light path: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the first lens is a biconvex lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, the fourth lens is a convex-concave lens, and the fifth lens is a biconcave lens;
the second lens group consists of five lenses, and the following steps are sequentially carried out along the light path: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a concave-convex lens, the seventh lens is a biconvex lens, the eighth lens is a convex-concave lens, the ninth lens is a biconvex lens, the tenth lens is a concave-convex lens, and the ninth lens and the tenth lens are glued into a second gluing group;
the first lens has an optical power of 0.00815; the focal power of the second lens is-0.00375; the third lens has an optical power of 0.00624; the focal power of the fourth lens is 0.0234; the focal power of the fifth lens is-0.0617; the focal power of the sixth lens is 0.00941; the focal power of the seventh lens is 0.0116; the focal power of the eighth lens is-0.0174; the focal power of the ninth lens is-0.0113; the optical power of the tenth lens is 0.00453; the units are all mm -1 。
2. The large target double telecentric lens of claim 1, wherein said double telecentric lens accommodates maximum detector diagonal dimensions up to Φ21.7mm.
3. The large target surface double telecentric lens according to claim 1, wherein the adjustable range of the object distance of the double telecentric lens is 105mm-180 mm.
4. The large target double telecentric lens of claim 1, wherein said first lens is made of barium crown glass material, said second lens is made of heavy fire glass material, said third and fourth lenses are made of barium crown glass material, said fifth and sixth lenses are made of heavy fire glass material, and said seventh lens is made of barium crown glass material; the eighth lens is made of heavy fire glass material, the ninth lens is made of barium crown glass material and the tenth lens is made of heavy fire glass material.
5. The large target area double telecentric lens of claim 1, wherein said fifth lens is formed by two lenses glued together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210554077.8A CN114924396B (en) | 2022-05-20 | 2022-05-20 | Large target surface double telecentric lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210554077.8A CN114924396B (en) | 2022-05-20 | 2022-05-20 | Large target surface double telecentric lens |
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| Publication Number | Publication Date |
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| CN114924396A CN114924396A (en) | 2022-08-19 |
| CN114924396B true CN114924396B (en) | 2024-03-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001324675A (en) * | 2000-05-17 | 2001-11-22 | Mitsubishi Electric Corp | Retrofocus type lens and projection type display device |
| JP2010211160A (en) * | 2009-03-12 | 2010-09-24 | Nittoh Kogaku Kk | Lens system including both-side telecentric lens system |
| CN207689737U (en) * | 2017-12-27 | 2018-08-03 | 福建师范大学 | The low distortion industrial lens of big target surface |
| CN109557641A (en) * | 2018-12-29 | 2019-04-02 | 苏州源卓光电科技有限公司 | A kind of doubly telecentric projection lithography camera lens |
| CN209765151U (en) * | 2019-05-22 | 2019-12-10 | 福建师范大学 | Double telecentric lens with double vision fields |
| CN113433680A (en) * | 2021-07-14 | 2021-09-24 | 光虎光电科技(天津)有限公司 | Double-telecentric lens |
-
2022
- 2022-05-20 CN CN202210554077.8A patent/CN114924396B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001324675A (en) * | 2000-05-17 | 2001-11-22 | Mitsubishi Electric Corp | Retrofocus type lens and projection type display device |
| JP2010211160A (en) * | 2009-03-12 | 2010-09-24 | Nittoh Kogaku Kk | Lens system including both-side telecentric lens system |
| CN207689737U (en) * | 2017-12-27 | 2018-08-03 | 福建师范大学 | The low distortion industrial lens of big target surface |
| CN109557641A (en) * | 2018-12-29 | 2019-04-02 | 苏州源卓光电科技有限公司 | A kind of doubly telecentric projection lithography camera lens |
| CN209765151U (en) * | 2019-05-22 | 2019-12-10 | 福建师范大学 | Double telecentric lens with double vision fields |
| CN113433680A (en) * | 2021-07-14 | 2021-09-24 | 光虎光电科技(天津)有限公司 | Double-telecentric lens |
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| CN114924396A (en) | 2022-08-19 |
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