CN113433680B - Double-telecentric lens - Google Patents
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- CN113433680B CN113433680B CN202110794770.8A CN202110794770A CN113433680B CN 113433680 B CN113433680 B CN 113433680B CN 202110794770 A CN202110794770 A CN 202110794770A CN 113433680 B CN113433680 B CN 113433680B
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- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 15
- 238000003384 imaging method Methods 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 239000003292 glue Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 3
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- 201000009310 astigmatism Diseases 0.000 description 2
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- G—PHYSICS
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- 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
- 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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Abstract
The invention discloses a double telecentric lens, belonging to the technical field of optical design, which is characterized by comprising an optical amplification group, an aperture diaphragm and an imaging group; the optical amplification group consists of five lenses, wherein; the first lens is a biconvex lens, the second lens is a biconvex lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens, and the fifth lens is a concave lens; the fourth lens and the fifth lens are glued to form a first gluing group; the aperture diaphragm is positioned between the optical amplification group and the imaging group; the imaging group consists of five lenses, wherein: the sixth lens is a concave lens, the seventh lens is a convex-concave lens, the eighth lens is a biconvex lens, the ninth lens is a convex-concave lens, the tenth lens is a biconcave lens, and the sixth lens and the seventh lens are cemented into a second cemented group. The invention improves the resolution and contrast of the lens and reduces the telecentricity and distortion rate of the lens under the condition of ensuring large multiplying power.
Description
Technical Field
The invention belongs to the technical field of optical design, and particularly relates to a double telecentric lens.
Background
The industrial lens plays an important role in a machine vision system, and the requirement on the industrial lens is more and more accurate along with the development of the technology. In order to overcome the problems of large distance and small distance, a double telecentric technology is developed, the magnification ratio cannot be changed along with the change of the object distance within a certain object distance range, and no strict requirement is made on the position of a detected element. Compared with a common lens, the object under the double telecentric lens can more accurately show the size of the industrial element. With the continuous development of machine vision systems, higher requirements are put on the performance of the double telecentric lens.
At present, only the object space telecentric lenses have more large multiplying power in the market, but the high-performance large multiplying power double telecentric lenses in the market are very few. The double telecentric lens has very important influence on precision measurement, and along with the continuous development of machine vision, the performance requirement on the double telecentric lens is higher and higher. For a double telecentric lens, most of the existing double telecentric lenses are small-magnification lenses, and most of the double telecentric lenses can only achieve distortion rate of 0.1% and telecentricity of 0.1 °, and the processing of contrast and resolution is rough, so that the requirements of more and more accurate precision measurement of different products can not be met. The invention aims to solve the problems of designing a high-magnification double telecentric lens, improving the performance of the double telecentric lens, reducing distortion rate and telecentricity as much as possible and improving contrast and resolution as much as possible. The existing large-magnification double telecentric lens is few and has some rough design, the contrast and the resolution are not very high, the telecentricity is 0.1 degrees, the distortion rate is 0.1 percent, and the requirement of increasingly accurate measurement precision can not be met.
Disclosure of Invention
The invention provides a double telecentric lens for solving the technical problems in the prior art, which improves the resolution and the contrast of the lens and reduces the telecentricity and the distortion rate of the lens under the condition of ensuring large multiplying power.
The invention aims to provide a double telecentric lens, which sequentially comprises an optical amplification group, an aperture diaphragm and an imaging group along a light path; wherein:
the optical amplification group consists of five lenses and sequentially comprises the following components along a light path: the lens comprises 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 biconvex lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens, and the fifth lens is a concave lens; the fourth lens and the fifth lens are glued to form a first gluing group;
the aperture diaphragm is positioned between the optical amplification group and the imaging group;
the imaging group consists of five lenses and sequentially comprises the following components along a light path: a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the sixth lens is a concave lens, the seventh lens is a convex-concave lens, the eighth lens is a biconvex lens, the ninth lens is a convex-concave lens, the tenth lens is a biconcave lens, and the sixth lens and the seventh lens are cemented into a second cemented group.
Preferably, the midpoint of the gluing of the fourth lens and the fifth lens is coated with a photosensitive glue.
Preferably, the midpoint of the gluing of the sixth lens and the seventh lens is coated with a photosensitive glue.
Preferably, the radius of curvature of the light incident surface of the first lens is 152.912 +/-5%, and the radius of curvature of the light emergent surface is-152.912 +/-5%; the curvature radius of the light incident surface of the second lens is 152.912 +/-5%, and the curvature radius of the light emergent surface is-152.912 +/-5%; the curvature radius of the light incident surface of the third lens is 65.019 +/-5%, and the curvature radius of the light emergent surface is-65.019 +/-5%; the curvature radius of the light incident surface of the fourth lens is-60.358 +/-5%, and the curvature radius of the light emergent surface of the fourth lens is-30.589 +/-5%; the curvature radius of the light incident surface of the fifth lens is-30.589 +/-5%, and the light emergent surface is a plane; the light incident surface of the sixth lens is a plane, and the curvature radius of the light emergent surface is 18.820 +/-5%; the curvature radius of the light incident surface of the seventh lens is 18.820 +/-5%, and the curvature radius of the light emergent surface of the seventh lens is 60.566 +/-5%; the curvature radius of the light incident surface of the eighth lens is 108.557 +/-5%, and the curvature radius of the light emergent surface is-42.753 +/-5%; the curvature radius of the light incident surface of the ninth lens is 30.275 +/-5%, and the curvature radius of the light emergent surface of the ninth lens is 53.616 +/-5%; the curvature radius of the light incident surface of the tenth lens is-121.132 +/-5%, the curvature radius of the light emergent surface is 20.769 +/-5%, and the unit is millimeter.
Preferably, the center thickness of the first lens is 5.218 ± 5%; the central thickness of the second lens is 7.564 +/-5%; the central thickness of the third lens is 4.125 +/-5%; the central thickness of the fourth lens is 2.958 +/-5%; the center thickness of the fifth lens is 2.428 +/-5%; the center thickness of the sixth lens is 6.028 +/-5%; the center thickness of the seventh lens is 6.543 +/-5%; the center thickness of the eighth lens is 7.683 +/-5%; the central thickness of the ninth lens is 7.934 +/-5%; the thickness of the center of the tenth lens is 6.254 +/-5 percent, and the unit is millimeter.
Preferably, the distance between the air spaces of the first lens and the second lens on the optical axis is 1 +/-5%; the distance between the air intervals of the second lens and the third lens on the optical axis is 12.473 +/-5%; the distance between the air intervals of the third lens and the fourth lens on the optical axis is 2.505 +/-5%; the distance between the fifth lens and the air space of the diaphragm on the optical axis is 13.541 +/-5%; the distance between the diaphragm and the air space of the sixth lens on the optical axis is 18.172 +/-5%; the distance between the air intervals of the seventh lens and the eighth lens on the optical axis is 45.053 +/-5%; the distance between the air intervals of the eighth lens and the ninth lens on the optical axis is 3.351 +/-5%; the distance between the air spaces of the ninth lens and the tenth lens on the optical axis is 5.889 +/-5%, and the units are millimeters.
Preferably, the refractive index and the abbe number of the first lens are 1.62 and 57 +/-5 percent respectively; the refractive index and Abbe number of the second lens are respectively 1.59 and 75.6 +/-5%; the refractive index and the Abbe number of the third lens are respectively 1.62 and 57 +/-5 percent; the refractive index and the Abbe number of the fourth lens are respectively 1.54 and 59.7 +/-5 percent; the refractive index and the Abbe number of the fifth lens are respectively 1.52 and 76.8 +/-5%; the refractive index and the Abbe number of the sixth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and the Abbe number of the seventh lens are respectively 1.61 and 56.7 +/-5 percent; the refractive index and the Abbe number of the eighth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and the Abbe number of the ninth lens are respectively 1.82 and 46.6 +/-5%; the refractive index and the Abbe number of the tenth lens are respectively 1.64 and 35.4 +/-5%.
The invention has the advantages and positive effects that:
the technical scheme of the invention comprises ten lenses, each lens or each plurality of lenses has the special functional emphasis, so that each performance parameter of the lens is responsible for the corresponding lens, and the performance parameters are optimized. The first gluing group and the second gluing group are doubly glued, the two lenses are made of two different glass materials, in order to ensure that the magnification of an imaged image cannot be 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 first glue group 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 second lens and the third lens mainly play a role in reducing object-side telecentricity errors; the ninth lens and the tenth lens are mainly used for reducing image space telecentricity errors. The first lens, the second lens, the eighth lens and the ninth lens are mainly used for adjusting the magnification of an optical path.
Each lens has an important performance parameter, and the performance of the parameter can be improved in a more targeted manner. The light path passes through the first lens and the second lens, formally enters the lens light group, and the magnification of the light path is adjusted; adjusting object space telecentricity error by a third lens and the first gluing combination; then the light enters the imaging group through the diaphragm; the second gluing set receives the optical signal passing through the diaphragm, and the second gluing set is matched with the first gluing set to balance and reduce the distortion of the whole lens; the rest lenses mainly balance the image space telecentricity and distortion. Each lens plays its own role, and the lens formed by the combination has excellent performances of high contrast and resolution, low telecentricity and distortion rate under the condition of large magnification.
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 astigmatism for a preferred embodiment of the present invention;
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Please refer to fig. 1.
A double telecentric lens, comprising: an optical amplification group and an imaging group; wherein:
the optical amplification group consists of five lenses in total, and the optical path is as follows: the first lens 1 is a biconvex lens, the second lens 2 is a biconvex lens, the third lens 3 is a biconvex lens, the fourth lens 4 is a concave-convex lens, the fifth lens 5 is a concave lens, and the fourth lens and the fifth lens are doubly cemented to form a first cemented combination; an aperture diaphragm is arranged in the middle; the imaging group is also composed of five lenses, and the optical path is as follows: the sixth lens 6 is a concave lens, the seventh lens 7 is a convex-concave lens, the sixth lens and the seventh lens are doubly cemented to form a second cemented group, the eighth lens 8 is a biconvex lens, the ninth lens 9 is a convex-concave lens, and the tenth lens 10 is a biconcave lens.
The lenses of the first gluing group and the second gluing group are formed by combining two lenses, and the focuses of the two lenses are on the same straight line.
The convex-concave lenses and the concave lenses of the first cemented group are coaxial.
The concave lens and the convex-concave lens of the second cemented group are coaxial.
The middle point between the two lenses of the first gluing set and the second gluing set is coated with photosensitive glue.
Further explanation is made for each lens constituting the optical path: the curvature radius of the light incident surface of the first lens is 152.912 +/-5%, and the curvature radius of the light emergent surface is-152.912 +/-5%; the curvature radius of the light incident surface of the second lens is 152.912 +/-5%, and the curvature radius of the light emergent surface of the second lens is-152.912 +/-5%; the curvature radius of the light incident surface of the third lens is 65.019 +/-5%, and the curvature radius of the light emergent surface is-65.019 +/-5%; the curvature radius of the light incident surface of the fourth lens is-60.358 +/-5%, and the curvature radius of the light emergent surface of the fourth lens is-30.589 +/-5%; the curvature radius of the light incident surface of the fifth lens is-30.589 +/-5%, and the curvature radius of the light emergent surface is infinite; the curvature radius of the light incident surface of the sixth lens is infinite, and the curvature radius of the light emergent surface is 18.820 +/-5%; the curvature radius of the light incident surface of the seventh lens is 18.820 +/-5%, and the curvature radius of the light emergent surface of the seventh lens is 60.566 +/-5%; the curvature radius of the light incident surface of the eighth lens is 108.557 +/-5%, and the curvature radius of the light emergent surface of the eighth lens is-42.753 +/-5%; the curvature radius of the light incident surface of the ninth lens is 30.275 +/-5%, and the curvature radius of the light emergent surface of the ninth lens is 53.616 +/-5%; the curvature radius of the light incident surface of the tenth lens is-121.132 +/-5%, and the curvature radius of the light emergent surface of the tenth lens is 20.769 +/-5%. The units are millimeters.
Center thickness of each lens constituting a double telecentric optical path: the center thickness of the first lens is 5.218 +/-5%; the center thickness of the second lens is 7.564 +/-5%; the center thickness of the third lens is 4.125 +/-5%; the center thickness of the fourth lens is 2.958 +/-5%; the center thickness of the fifth lens is 2.428 +/-5%; the center thickness of the sixth lens is 6.028 +/-5%; the center thickness of the seventh lens is 6.543 +/-5%; the center thickness of the eighth lens is 7.683 +/-5%; the central thickness of the ninth lens is 7.934 +/-5%; the thickness of the tenth lens piece was 6.254 + -5% at the center. The units are millimeters.
The distance between the object and the air space of the first lens on the optical axis is 50 +/-5%; the distance between the air intervals of the first lens and the second lens on the optical axis is 1 +/-5%; the distance between the air intervals of the second lens and the third lens on the optical axis is 12.473 +/-5%; the distance between the air intervals of the third lens and the fourth lens on the optical axis is 2.505 +/-5%; the fourth lens and the fifth lens are double-glued without a gap; the distance between the fifth lens and the air space of the diaphragm on the optical axis is 13.541 +/-5%; the distance between the diaphragm and the air space of the sixth lens on the optical axis is 18.172 +/-5%; the sixth lens and the seventh lens are double-cemented without a gap; the distance between the air intervals of the seventh lens and the eighth lens on the optical axis is 45.053 +/-5%; the distance between the air intervals of the eighth lens and the ninth lens on the optical axis is 3.351 +/-5%; the distance between the air spaces of the ninth lens and the tenth lens on the optical axis is 5.889 +/-5%. The units are millimeters.
Refractive index and abbe number of each lens constituting the double telecentric optical path: the refractive index and Abbe number of the first lens are respectively 1.62 and 57 +/-5 percent; the refractive index and Abbe number of the second lens are respectively 1.59 and 75.6 +/-5 percent; the refractive index and Abbe number of the third lens are respectively 1.62 and 57 +/-5 percent; the refractive index and Abbe number of the fourth lens are respectively 1.54 and 59.7 +/-5 percent; the refractive index and Abbe number of the fifth lens are respectively 1.52 and 76.8 +/-5 percent; the refractive index and Abbe number of the sixth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and Abbe number of the seventh lens are respectively 1.61 and 56.7 +/-5 percent; the refractive index and Abbe number of the eighth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and Abbe number of the ninth lens are respectively 1.82 and 46.6 +/-5 percent; the refractive index and Abbe number of the tenth lens are respectively 1.64 and 35.4 +/-5%.
The working distance of the double telecentric lens is 50mm, and the working wavelength band is 450nm-700 nm.
Referring to fig. 2, the optical speckle pattern shows: wherein, the OBJ is the object space view field, the IMA is the image space view field, and the unit is millimeter. RMS RADIUS represents the root mean square RADIUS of the diffuse spot, GEO RADIUS represents the Airy spot RADIUS, both in microns. As shown, the Airy spot radius is 2.309 μm and the root mean square radius is 3.220 μm at the central field of view; in the marginal field of view, the radius of the Airy spots is 2.651 μm, the radius of the root mean square is 7.378 μm, 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.
Referring to fig. 3, the MTF graph shows that: the abscissa is spatial resolution, in line pairs/mm, the ordinate is contrast, the range is 0-1, and TS represents the meridional and sagittal components of MTF in different fields of view. As shown, the MTF value of each field has a contrast greater than 0.3 at 150 line pairs/mm, and the overall MTF curve is compact, which shows high contrast and resolution of the lens.
Referring to fig. 4, from the field curvature and astigmatism diagrams: the ordinate is the field of view and the abscissa is in millimeters.
The distortion diagram shows that: the ordinate 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 0.02%, and the lens has an extremely low distortion value.
In conclusion: the double telecentric lens designed by the invention has very high contrast and resolution ratio and extremely low telecentricity and distortion rate.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A double telecentric lens is characterized by comprising an optical amplification group, an aperture diaphragm and an imaging group along an optical path in sequence; wherein:
the optical amplification group consists of five lenses and sequentially comprises the following components along a light path: the lens comprises 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 biconvex lens, the third lens is a biconvex lens, the fourth lens is a concave-convex lens, and the fifth lens is a concave lens; the fourth lens and the fifth lens are glued to form a first gluing group;
the aperture diaphragm is positioned between the optical amplification group and the imaging group;
the imaging group consists of five lenses and sequentially comprises the following components along a light path: a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the sixth lens is a concave lens, the seventh lens is a convex-concave lens, the eighth lens is a biconvex lens, the ninth lens is a convex-concave lens, the tenth lens is a biconcave lens, and the sixth lens and the seventh lens are cemented into a second cemented group.
2. The double telecentric lens of claim 1, wherein the midpoint of the fourth lens and the fifth lens that are cemented together is coated with a photosensitive glue.
3. The double telecentric lens of claim 1, wherein the midpoint of the sixth lens and the seventh lens, when cemented, is coated with a light sensitive adhesive.
4. The double telecentric lens system of claim 1, wherein the radius of curvature of the light incident surface of the first lens is 152.912 ± 5%, and the radius of curvature of the light emergent surface is-152.912 ± 5%; the curvature radius of the light incident surface of the second lens is 152.912 +/-5%, and the curvature radius of the light emergent surface is-152.912 +/-5%; the curvature radius of the light incident surface of the third lens is 65.019 +/-5%, and the curvature radius of the light emergent surface is-65.019 +/-5%; the curvature radius of the light incident surface of the fourth lens is-60.358 +/-5%, and the curvature radius of the light emergent surface of the fourth lens is-30.589 +/-5%; the curvature radius of the light incident surface of the fifth lens is-30.589 +/-5%, and the light emergent surface is a plane; the light incident surface of the sixth lens is a plane, and the curvature radius of the light emergent surface is 18.820 +/-5%; the curvature radius of the light incident surface of the seventh lens is 18.820 +/-5%, and the curvature radius of the light emergent surface of the seventh lens is 60.566 +/-5%; the curvature radius of the light incident surface of the eighth lens is 108.557 +/-5%, and the curvature radius of the light emergent surface is-42.753 +/-5%; the curvature radius of the light incident surface of the ninth lens is 30.275 +/-5%, and the curvature radius of the light emergent surface of the ninth lens is 53.616 +/-5%; the curvature radius of the light incident surface of the tenth lens is-121.132 +/-5%, the curvature radius of the light emergent surface is 20.769 +/-5%, and the unit is millimeter.
5. A double telecentric lens system according to claim 1, wherein the first lens has a center thickness of 5.218 ± 5%; the central thickness of the second lens is 7.564 +/-5%; the central thickness of the third lens is 4.125 +/-5%; the central thickness of the fourth lens is 2.958 +/-5%; the center thickness of the fifth lens is 2.428 +/-5%; the center thickness of the sixth lens is 6.028 +/-5%; the center thickness of the seventh lens is 6.543 +/-5%; the center thickness of the eighth lens is 7.683 +/-5%; the central thickness of the ninth lens is 7.934 +/-5%; the thickness of the center of the tenth lens is 6.254 +/-5 percent, and the unit is millimeter.
6. The double telecentric lens of claim 1, wherein the air separation of the first and second lenses is 1 ± 5% of the distance on the optical axis; the distance between the air intervals of the second lens and the third lens on the optical axis is 12.473 +/-5%; the distance between the air intervals of the third lens and the fourth lens on the optical axis is 2.505 +/-5%; the distance between the fifth lens and the air space of the diaphragm on the optical axis is 13.541 +/-5%; the distance between the diaphragm and the air space of the sixth lens on the optical axis is 18.172 +/-5%; the distance between the air intervals of the seventh lens and the eighth lens on the optical axis is 45.053 +/-5%; the distance between the air intervals of the eighth lens and the ninth lens on the optical axis is 3.351 +/-5%; the distance between the air spaces of the ninth lens and the tenth lens on the optical axis is 5.889 +/-5%, and the units are millimeters.
7. A double telecentric lens according to claim 1, wherein the refractive index and abbe number of the first lens sheet are 1.62, 57 ± 5%, respectively; the refractive index and the Abbe number of the second lens are respectively 1.59 and 75.6 +/-5 percent; the refractive index and the Abbe number of the third lens are respectively 1.62 and 57 +/-5 percent; the refractive index and the Abbe number of the fourth lens are respectively 1.54 and 59.7 +/-5 percent; the refractive index and the Abbe number of the fifth lens are respectively 1.52 and 76.8 +/-5%; the refractive index and the Abbe number of the sixth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and the Abbe number of the seventh lens are respectively 1.61 and 56.7 +/-5 percent; the refractive index and the Abbe number of the eighth lens are respectively 1.69 and 31.2 +/-5%; the refractive index and the Abbe number of the ninth lens are respectively 1.82 and 46.6 +/-5%; the refractive index and the Abbe number of the tenth lens are respectively 1.64 and 35.4 +/-5%.
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| CN208795920U (en) * | 2018-10-18 | 2019-04-26 | 光虎光电科技(天津)有限公司 | A kind of low distortion doubly telecentric camera lens |
| CN211454083U (en) * | 2019-11-22 | 2020-09-08 | 福建福光天瞳光学有限公司 | 1.0-time 110mm object distance high-resolution double telecentric optical system and lens |
| CN110908063A (en) * | 2019-12-23 | 2020-03-24 | 福建福光天瞳光学有限公司 | Short-focus high-resolution short-wave infrared lens and imaging method thereof |
| CN211454066U (en) * | 2019-12-23 | 2020-09-08 | 福建福光天瞳光学有限公司 | Short-wave infrared lens with short focal length and high resolution |
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