CN112269242A - High-resolution oblique image lens - Google Patents
High-resolution oblique image lens Download PDFInfo
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- CN112269242A CN112269242A CN202011319910.8A CN202011319910A CN112269242A CN 112269242 A CN112269242 A CN 112269242A CN 202011319910 A CN202011319910 A CN 202011319910A CN 112269242 A CN112269242 A CN 112269242A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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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Abstract
The invention discloses a high-resolution oblique image lens, and relates to the technical field of industrial cameras. The optical axis is sequentially provided with a first spherical lens with positive focal power, a second spherical lens with positive focal power, a diaphragm, a third spherical lens with negative focal power, a fourth spherical lens with negative focal power, a fifth spherical lens with positive focal power, a sixth spherical lens with negative focal power, a seventh spherical lens with positive focal power and an eighth spherical lens with positive focal power from the object side to the image side. The invention designs eight spherical oblique image lenses which meet the Sim's law and are suitable for a target plane with a 0-500mm visual field, and the lenses can clearly image the oblique target in a full-visual-field high-resolution manner and meet the requirements of industrial cameras in the field of 3D line laser measurement.
Description
Technical Field
The invention relates to the technical field of industrial cameras, in particular to a high-resolution oblique image lens.
Background
With the development of optics, image processing and computer technology, 3D line laser measurement technology is widely used. The method utilizes an industrial camera to shoot to obtain corresponding image information, carries out a series of processing on the image, extracts required information and finally achieves the purpose of measurement. The 3D line laser measurement technology needs a lens to shoot an inclined target, and the traditional lens is difficult to clearly image the inclined target in a full view due to the limitation of depth of field.
The Simm's law is that when the extension planes of the three planes, i.e. the object plane, the image plane and the lens plane, are intersected in a straight line, a complete and clear image can be obtained. The discovery of the law of Samm provides a theoretical basis for clear imaging of oblique objects.
Disclosure of Invention
The invention aims to provide a high-resolution oblique image lens which can clearly image an oblique target in a full view field and meets the Simm's law.
In order to solve the problems, the technical scheme of the invention is as follows:
the utility model provides a high resolution oblique image lens, the optical axis distributes from the object side to the image side in proper order:
a first spherical lens having positive optical power, including a first surface on an object side and a second surface on an image side;
a second spherical lens having positive optical power, including a third surface located on the object side and a fourth surface located on the image side;
a diaphragm comprising a fifth face;
a third spherical lens having a negative power, including a sixth surface on the object side and a seventh surface on the image side;
a fourth spherical lens having a negative power, including an eighth surface located on the object side and a ninth surface located on the image side;
a fifth spherical lens having positive optical power, including a tenth surface located on the object side and a tenth surface located on the image side;
a sixth spherical lens having a negative refractive power, including a twelfth facet located on the object side and a thirteenth facet located on the image side;
a seventh spherical lens having positive optical power, including a fourteenth surface located on the object side and a fifteenth surface located on the image side;
and an eighth spherical lens having positive optical power, including a sixteenth surface located on the object side and a seventeenth surface located on the image side.
Further, the field of view of the target plane is 0-500 mm.
The optical filter is arranged on one side, close to the image side, of the eighth spherical lens, and comprises a tenth eight surface located on the object side and a nineteenth surface located on the image side.
Further, when the field of view of the target plane is 10mm, the parameters of each lens are as follows:
the included angle between the object plane and the optical axis is 72 degrees, the included angle between the detector plane and the optical axis is 76.23 degrees, and the magnification of the lens is 0.754.
Further, when the field of view of the target plane is 250mm, the parameters of each lens are:
the included angle between the target plane and the optical axis is 30.8 degrees, the included angle between the detector plane and the optical axis is 74.66 degrees, and the magnification of the lens is 0.163.
Further, when the field of view of the target plane is 500mm, the parameters of each lens are as follows:
the included angle between the target plane and the optical axis is 30.8 degrees, the included angle between the detector plane and the optical axis is 74.66 degrees, and the magnification of the lens is 0.163.
Further, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 35mm, and F/#is2.4.
Further, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 35mm, and F/#is3.5.
Further, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 34.4mm, and F/#is3.58.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention designs eight spherical oblique image lenses meeting the Samm's law, and the lenses can clearly image the oblique target in full view and high resolution;
2. the oblique image lens designed by the invention is suitable for a target plane with a 0-500mm visual field, has a wide application range, and meets the requirements of industrial cameras in the field of 3D line laser measurement;
3. the first spherical lens is favorable for eliminating coma, the second spherical lens is favorable for eliminating spherical aberration, coma and axial chromatic aberration, the diaphragm is arranged between the second spherical lens and the third spherical lens and is favorable for eliminating coma, magnification chromatic aberration and distortion, the third, fourth and fifth spherical lenses are favorable for eliminating spherical aberration, coma, axial chromatic aberration and astigmatism, the sixth, seventh and eighth spherical lenses are favorable for eliminating distortion and field curvature, and the oblique image lens has reasonable positive and negative focal power distribution.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the imaging principle of Samm's law;
FIG. 2 is a schematic view of an oblique image lens structure;
FIG. 3 is a schematic diagram of an oblique-image lens with DOF of 10 mm;
FIG. 4 is a schematic diagram of an MTF curve of an oblique lens with DOF of 10 mm;
FIG. 5 is a schematic diagram of an axial spherical aberration curve of an oblique-image lens with DOF of 10 mm;
FIG. 6 is a schematic diagram of a skew image lens distortion curve with DOF of 10 mm;
FIG. 7 is a schematic diagram of an oblique lens with DOF of 250 mm;
FIG. 8 is a schematic diagram of an MTF curve of an oblique lens with DOF of 250 mm;
FIG. 9 is a schematic diagram of an axial spherical aberration curve of an oblique-image lens with DOF of 250 mm;
FIG. 10 is a schematic diagram of a skew image lens distortion curve with DOF of 250 mm;
fig. 11 is a schematic diagram of an oblique image lens with DOF of 500 mm;
fig. 12 is a schematic diagram of an oblique lens MTF curve with DOF of 500 mm;
FIG. 13 is a schematic diagram of an axial spherical aberration curve of an oblique-image lens with DOF of 500 mm;
FIG. 14 is a schematic diagram of a skew image lens distortion curve with DOF of 500 mm;
wherein, 1 is a first spherical lens; 2 is a second spherical lens; 3 is a diaphragm; 4 is a third spherical lens; 5 is a fourth spherical lens; 6 is a fifth spherical lens; 7 is a sixth spherical lens; 8 is a seventh spherical lens; 9 is an eighth spherical lens; and 10 is a filter.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.
Example (b):
as shown in fig. 1 to 14, the optical axes of the high-resolution oblique image lens are distributed from the object side to the image side in order:
a first spherical lens 1 having positive optical power, including a first surface on an object side and a second surface on an image side;
a second spherical lens 2 having positive optical power, including a third surface on the object side and a fourth surface on the image side;
a diaphragm 3 including a fifth face;
a third spherical lens 4 having a negative power, including a sixth surface on the object side and a seventh surface on the image side;
a fourth spherical lens 5 having a negative power, including an eighth surface located on the object side and a ninth surface located on the image side;
a fifth spherical lens 6 having positive optical power, including a tenth surface on the object side and a tenth surface on the image side;
a sixth spherical lens 7 having a negative power, including a twelfth facet located on the object side and a thirteenth facet located on the image side;
a seventh spherical lens 8 having positive optical power, including a fourteenth surface located on the object side and a fifteenth surface located on the image side;
the eighth spherical lens 9 having positive optical power includes a sixteenth surface located on the object side and a seventeenth surface located on the image side.
The optical filter 10 is disposed on the side of the eighth spherical lens 9 close to the image side, and includes a tenth eight surface located on the object side and a nineteenth surface located on the image side. The filter 10 may not be provided if the light source uses a monochromatic light source.
Fig. 1 shows a schematic diagram of the imaging principle of the schemer's law, extension lines of a target plane, a lens main surface and a detector plane intersect in a plane, and the intersecting plane is unique, and the following schemer's relational expression needs to be satisfied:
where DOF is the field of view of the target plane, i.e. the shooting range. Alpha is the included angle between the target plane and the optical axis of the lens, beta is the included angle between the detector plane and the optical axis of the lens, a 'is the object distance of the O point on the optical axis, b' is the image distance of the O point on the optical axis, and b '/a' is the magnification of the lens.
The first spherical lens 1 helps to eliminate coma, the second spherical lens 2 helps to eliminate spherical aberration, coma and axial chromatic aberration, the diaphragm 3 is arranged between the second spherical lens 2 and the third spherical lens 4 and helps to eliminate coma, magnification chromatic aberration and distortion, the third, fourth and fifth spherical lenses help to eliminate spherical aberration, coma, axial chromatic aberration and astigmatism, and the sixth, seventh and eighth spherical lenses help to eliminate distortion and curvature of field. Because the imaging lens has reasonable positive and negative focal power distribution, a full-view high-resolution oblique image lens with a photographing range of 0mm to 500mm can be designed.
When DOF is 10mm, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 35mm, and F/#is2.4. The detailed design structure is shown in fig. 3, and the detailed design parameters are as follows:
the included angle α between the design target plane and the optical axis is 72 degrees, the included angle β between the detector plane and the optical axis is 76.23 degrees, and the lens magnification b '/a' is 0.754. Further, tan (α)/tan (β) is 0.754, that is, satisfies the schemer relationship. Fig. 4 shows an imaging quality MTF graph of an oblique image lens with DOF of 10mm, MTF >0.4 in a full field of view, fig. 5 shows an axial spherical aberration graph of the oblique image lens with DOF of 10mm, the axial spherical aberration graph is smaller than 0.5mm in a full aperture, fig. 6 shows a distortion graph of the oblique image lens with DOF of 10mm, and distortion is smaller than 0.5% in the full field of view. In conclusion, the design has the advantages of full-field 10mm high-resolution imaging, small aberration and low distortion.
When DOF is 250mm, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 35mm, and F/#is3.5. See fig. 7 for detailed design structure, and the detailed design parameters are shown in the following table:
the included angle α between the object plane and the optical axis is 30.8 degrees, the included angle β between the detector plane and the optical axis is 74.66 degrees, and the lens magnification b '/a' is 0.163. Further, tan (α)/tan (β) is 0.163, that is, satisfies the hamming relation. Fig. 8 shows an imaging quality MTF graph of the oblique image lens with DOF of 250mm, the MTF is greater than 0.4 in the full field of view, fig. 9 shows an axial spherical aberration graph of the oblique image lens with DOF of 250mm, the total aperture is smaller than 0.5mm, fig. 10 shows a distortion graph of the oblique image lens with DOF of 250mm, and the distortion is smaller than 0.5% in the full field of view. In conclusion, the design has the advantages of high-resolution imaging of 250mm in full field of view, small aberration and low distortion.
When DOF is 500mm, the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 34.4mm, and F/#is3.58. The detailed design structure is shown in fig. 11, and the detailed design parameters are shown in the following table:
the included angle α between the object plane and the optical axis is 30.8 degrees, the included angle β between the detector plane and the optical axis is 74.66 degrees, and the lens magnification b '/a' is 0.163. Further, tan (α)/tan (β) is 0.163, that is, satisfies the hamming relation. Fig. 12 shows an imaging quality MTF graph of the oblique image lens with DOF of 500mm, the MTF is greater than 0.4 in the full field of view, fig. 13 shows an axial spherical aberration graph of the oblique image lens with DOF of 500mm, the total aperture is smaller than 0.5mm, fig. 14 shows a distortion graph of the oblique image lens with DOF of 500mm, and the distortion is smaller than 0.5% in the full field of view. In conclusion, the design has the advantages of full-field 500mm high-resolution imaging, small aberration and low distortion.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A high-resolution oblique image lens is characterized in that: the optical axis distributes from the object side to the image side:
a first spherical lens having positive optical power, including a first surface on an object side and a second surface on an image side;
a second spherical lens having positive optical power, including a third surface located on the object side and a fourth surface located on the image side;
a diaphragm comprising a fifth face;
a third spherical lens having a negative power, including a sixth surface on the object side and a seventh surface on the image side;
a fourth spherical lens having a negative power, including an eighth surface located on the object side and a ninth surface located on the image side;
a fifth spherical lens having positive optical power, including a tenth surface located on the object side and a tenth surface located on the image side;
a sixth spherical lens having a negative refractive power, including a twelfth facet located on the object side and a thirteenth facet located on the image side;
a seventh spherical lens having positive optical power, including a fourteenth surface located on the object side and a fifteenth surface located on the image side;
and an eighth spherical lens having positive optical power, including a sixteenth surface located on the object side and a seventeenth surface located on the image side.
2. The high-resolution oblique imaging lens according to claim 1, wherein: the field of view of the target plane is 0-500 mm.
3. The high-resolution oblique imaging lens according to claim 2, wherein: the optical filter is arranged on one side, close to the image side, of the eighth spherical lens and comprises a tenth octahedral surface located on the object side and a nineteenth surface located on the image side.
4. A high-resolution oblique imaging lens according to claim 3, wherein: when the field of view of the target plane is 10mm, the parameters of each lens are as follows:
the included angle between the object plane and the optical axis is 72 degrees, the included angle between the detector plane and the optical axis is 76.23 degrees, and the magnification of the lens is 0.754.
5. A high-resolution oblique imaging lens according to claim 3, wherein: when the field of view of the target plane is 250mm, the parameters of each lens are as follows:
the included angle between the target plane and the optical axis is 30.8 degrees, the included angle between the detector plane and the optical axis is 74.66 degrees, and the magnification of the lens is 0.163.
6. A high-resolution oblique imaging lens according to claim 3, wherein: when the field of view of the target plane is 500mm, the parameters of each lens are as follows:
the included angle between the target plane and the optical axis is 30.8 degrees, the included angle between the detector plane and the optical axis is 74.66 degrees, and the magnification of the lens is 0.163.
7. The high-resolution oblique imaging lens according to claim 4, wherein: the detector size is 1/1.8 ", the operating wavelength is 405 ± 10nm, the lens focal length F is 35mm, and F/#is2.4.
8. The high-resolution oblique imaging lens according to claim 5, wherein: the detector size is 1/1.8', the working wavelength is 405 + -10 nm, the lens focal length F is 35mm, and F/#is3.5.
9. The high-resolution oblique imaging lens according to claim 6, wherein: the detector size is 1/1.8 ", the working wavelength is 405 +/-10 nm, the lens focal length F is 34.4mm, and F/#is3.58.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011319910.8A CN112269242B (en) | 2020-11-23 | 2020-11-23 | High-resolution oblique image lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011319910.8A CN112269242B (en) | 2020-11-23 | 2020-11-23 | High-resolution oblique image lens |
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| CN112269242A true CN112269242A (en) | 2021-01-26 |
| CN112269242B CN112269242B (en) | 2022-07-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281883A (en) * | 2021-06-08 | 2021-08-20 | 中国科学院自动化研究所苏州研究院 | High-resolution oblique image industrial projection lens |
| CN114216404A (en) * | 2021-11-16 | 2022-03-22 | 苏州中科行智智能科技有限公司 | Line laser sensor of Sanm lens |
| CN116026849A (en) * | 2023-02-14 | 2023-04-28 | 深圳赛陆医疗科技有限公司 | Cleanliness detection system |
| CN116360083A (en) * | 2023-04-23 | 2023-06-30 | 深圳市道显技术有限公司 | Moke lens and linear laser sensor |
| CN116819730A (en) * | 2023-06-30 | 2023-09-29 | 梅卡曼德（北京）机器人科技有限公司 | Momer lens and electronic equipment |
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| JPH08327896A (en) * | 1995-05-26 | 1996-12-13 | Minolta Co Ltd | Lens system |
| CN102566015A (en) * | 2010-12-29 | 2012-07-11 | 凤凰光学(上海)有限公司 | Lens of fixed focus type projector |
| CN203595856U (en) * | 2013-11-11 | 2014-05-14 | 舜宇光学(中山)有限公司 | Athermal monitoring camera lens |
| CN111580245A (en) * | 2020-05-25 | 2020-08-25 | 苏州中科全象智能科技有限公司 | High-resolution Samm lens |
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| JPH08327896A (en) * | 1995-05-26 | 1996-12-13 | Minolta Co Ltd | Lens system |
| CN102566015A (en) * | 2010-12-29 | 2012-07-11 | 凤凰光学(上海)有限公司 | Lens of fixed focus type projector |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281883A (en) * | 2021-06-08 | 2021-08-20 | 中国科学院自动化研究所苏州研究院 | High-resolution oblique image industrial projection lens |
| CN114216404A (en) * | 2021-11-16 | 2022-03-22 | 苏州中科行智智能科技有限公司 | Line laser sensor of Sanm lens |
| CN116026849A (en) * | 2023-02-14 | 2023-04-28 | 深圳赛陆医疗科技有限公司 | Cleanliness detection system |
| CN116026849B (en) * | 2023-02-14 | 2023-12-01 | 深圳赛陆医疗科技有限公司 | Cleanliness detection system |
| CN116360083A (en) * | 2023-04-23 | 2023-06-30 | 深圳市道显技术有限公司 | Moke lens and linear laser sensor |
| CN116819730A (en) * | 2023-06-30 | 2023-09-29 | 梅卡曼德（北京）机器人科技有限公司 | Momer lens and electronic equipment |
| CN116819730B (en) * | 2023-06-30 | 2024-01-26 | 梅卡曼德（北京）机器人科技有限公司 | Momer lens and electronic equipment |
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