CN114924396A - Large-target-surface double-telecentric lens - Google Patents
Large-target-surface double-telecentric lens Download PDFInfo
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- CN114924396A CN114924396A CN202210554077.8A CN202210554077A CN114924396A CN 114924396 A CN114924396 A CN 114924396A CN 202210554077 A CN202210554077 A CN 202210554077A CN 114924396 A CN114924396 A CN 114924396A
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 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
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000005259 measurement Methods 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
- 238000012360 testing method Methods 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
- G02B13/22—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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Abstract
The invention belongs to the technical field of optical lenses and discloses a large-target-surface double-telecentric lens. Two telecentric lens include first battery of lens, aperture diaphragm and second battery of lens, first battery of lens comprises five lenses, follows the light path and does in proper order: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are a biconvex lens, a concave-convex lens, a convex-concave projection lens and a biconcave lens in sequence; the second lens group comprises five lenses, and the optical path is as follows in sequence: the sixth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the tenth lens element are, in order, a meniscus lens element, a biconvex lens element, a meniscus lens element and a meniscus lens element, and the ninth lens element and the tenth lens element are cemented together to form a second cemented group. The double telecentric lens has the characteristics of visible light spectrum section, double telecentric object image, large target surface of the detector, adjustable object distance and the like; the requirements of an optical system on a large detector target can be met, and the requirements on various object distances can also 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 is to use a machine to replace human eyes for measurement and judgment. The optical lens is an important component of a machine vision system, and with the development of technology, the requirement on an industrial lens is more and more precise. 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 magnification can be kept unchanged within a certain object distance range, and the double telecentric lens is applied to various machine vision detection systems.
The large magnification of the object space telecentric lens in the current market is more, but the high-performance large-target-surface double-telecentric lens with adjustable object distance in the current market is very few. The double telecentric lens plays a very important role in precision measurement, and along with the continuous development of machine vision, the performance requirement of 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 increase the target surface size of the lens while ensuring the telecentricity and distortion rate. The technical scheme adopted by the invention is as follows:
a large-target-surface double telecentric lens comprises a first lens group, an aperture diaphragm and a second lens group along a light path in sequence; wherein:
the first lens group consists of five lenses and sequentially comprises the following components along a 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 projection 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 comprises five lenses, and the optical path is as follows in sequence: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a meniscus lens, the seventh lens is a biconvex lens, the eighth lens is a meniscus lens, the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, and the ninth lens and the tenth lens are cemented into a second cemented 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 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 tenth lens has an optical power of 0.00453; the units are diopters.
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 a heavy fire glass material, the ninth lens is made of a barium crown glass material, and the tenth lens is made of a heavy fire glass material.
The maximum detector diagonal size 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 which can be realized by adjusting the rear working distance is 105mm-180 mm. Therefore, the double telecentric lens obviously has the characteristics of large target surface and adjustable object distance.
In the technical scheme of the invention, the lens comprises eleven lenses (the fifth lens is formed by gluing two lenses), each lens or each plurality of lenses has the specific functional emphasis, so that each parameter of the lens is responsible for the corresponding lens, and the performance parameter of the lens is optimized. The grouping optimization and the multiple structure design increase the target surface size of the double telecentric lens, and widen the adjustable range of the object distance, so that the lens can adapt to wider and more complex working environment and working requirements. In the invention, the relative positions of all lenses of the first lens group and 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 cementing group is doubly cemented, the two lenses are made of two different glass materials, in order to ensure that the magnification of the imaged image is not changed, and the two glass combinations can mutually offset the distortion caused by the properties of the lenses; the lenses are coaxial, which allows the light to be injected and emitted with the greatest possible cancellation of the distortion effects of the lenses themselves. The two groups of lens glue groups are mainly responsible for balancing lens distortion, and the fifth lens and the second glue group are matched with each other, so that the distortion of the lenses can be counteracted to the greatest extent.
The invention has the following beneficial effects:
1. by grouping optimization and multiple structural design, the large target surface and wide object distance adjustable range of the double telecentric lens are realized.
2. And the lenses made of different glass materials are adopted, so that the distortion of the double telecentric lens is reduced.
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 the preferred embodiment of the present invention;
FIG. 4 is a graph of field curvature and distortion for a preferred embodiment of the present invention;
in the above description, 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a fourth lens, 5 is a lens on the front side of the fifth lens, 6 is a lens on 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 further understanding of the contents, features and effects of the present invention, the following detailed description will be given with reference to the accompanying drawings, in which:
example 1
The optical system of the large-target-surface double telecentric lens provided by the embodiment is shown in fig. 1, and the parameters of the first lens to the tenth lens are shown in the following table:
table 1 parameter list for eleven lenses of large target surface double telecentric lens in example 1
As shown in fig. 1, the large-target-surface double telecentric lens provided by the present invention mainly comprises a first lens group, an aperture stop and a second lens group, wherein:
the first lens group consists of five lenses and sequentially comprises the following components along a 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 projection lens, and the fifth lens is a biconcave lens; and, the fifth lens is formed by gluing two lenses, including a front lens and a rear lens.
The second lens group comprises five lenses, and the optical path is as follows in sequence: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a meniscus lens, the seventh lens is a biconvex lens, the eighth lens is a meniscus lens, the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, and the ninth lens and the tenth lens are cemented into a second cemented group.
An aperture stop is located between the first lens group and the second lens group.
Wherein the focal power of the first lens is 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 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 tenth lens has an optical power of 0.00453; the units are diopters.
After testing, the working distance of the double telecentric lens is 105mm-180mm, and the working wave band is 486 nm-656 nm.
Fig. 2 is an optical speckle pattern of the double telecentric lens, wherein OBJ is the object field of view and IMA is the image field of view, both in millimeters. RMS RADIUS represents the root mean square RADIUS of the diffuse spot, GEO RADIUS represents the Airy spot RADIUS, both in microns. As shown in FIG. 2, the Airy spots have a radius of 3.057 μm and a root mean square radius of 9.029 μm at the central field of view; in the marginal field of view, the radius of the Airy spots is 3.953 mu m, the root mean square radius is 11.980 mu m, most of the Airy spots are within the radius, the energy concentration and aberration correction of the on-axis and off-axis points are very good, and the ideal resolution is achieved.
Fig. 3 is a modulation function MTF graph of the double telecentric lens, where the abscissa is spatial resolution, the unit is line pair/mm, the ordinate is contrast, the range of values is 0 to 1, and TS represents the meridional and sagittal components of MTF in different fields of view. As shown in fig. 3, the MTF value for each field has a contrast greater than 0.2 at 150 line pairs/mm, and the overall MTF curve is compact, which shows high contrast and resolution for the lens.
FIG. 4 is a graph of curvature of field and distortion of the double telecentric lens, wherein the field curvature has a field of view on the ordinate and a millimeter unit on the abscissa; the ordinate of the distortion map is the field of view and the abscissa is the distortion value. As shown in fig. 4, the distortion value of the lens in the full field of view is less than 0.05%, and the lens has an extremely low distortion value.
Claims (6)
1. The utility model provides a two telecentric lens of big target surface, its characterized in that, two telecentric lens include first lens group, aperture stop and second lens group along the light path in proper order, wherein:
the first lens group consists of five lenses and sequentially comprises the following components along a 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 projection lens, and the fifth lens is a biconcave lens;
the second lens group comprises five lenses, and the optical path is as follows in sequence: a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the sixth lens is a meniscus lens, the seventh lens is a biconvex lens, the eighth lens is a meniscus lens, the ninth lens is a biconvex lens, the tenth lens is a meniscus lens, and the ninth lens and the tenth lens are cemented into a second cemented group.
2. The large-target-surface double telecentric lens according to claim 1, wherein the double telecentric lens is adapted to the maximum detector diagonal size which can reach phi 21.7 mm.
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 to 180 mm.
4. A double telecentric lens system according to claim 1, 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 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 tenth lens has an optical power of 0.00453; the units are diopters.
5. The large-target-surface double-telecentric lens system according to claim 1, wherein the first lens is made of barium crown glass material, the second lens is made of hard 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 hard fire glass material, and the seventh lens is made of barium crown glass material; the eighth lens is made of a heavy fire glass material, the ninth lens is made of a barium crown glass material, and the tenth lens is made of a heavy fire glass material.
6. The large-target double telecentric lens system of claim 1, wherein the fifth lens is formed by gluing two lenses.
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 |
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| CN202210554077.8A CN114924396B (en) | 2022-05-20 | 2022-05-20 | Large target surface double telecentric lens |
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| CN114924396A true CN114924396A (en) | 2022-08-19 |
| CN114924396B 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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| CN114924396B (en) | 2024-03-22 |
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