CN113281883B - High-resolution oblique image industrial projection lens - Google Patents
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- CN113281883B CN113281883B CN202110636318.9A CN202110636318A CN113281883B CN 113281883 B CN113281883 B CN 113281883B CN 202110636318 A CN202110636318 A CN 202110636318A CN 113281883 B CN113281883 B CN 113281883B
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Abstract
The invention discloses a high-resolution oblique image industrial projection lens, and relates to the field of industrial detection. The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a diaphragm, wherein the first lens with positive focal power, the second lens with negative focal power, the third lens with negative focal power, the fourth lens with positive focal power, the fifth lens with positive focal power, the diaphragm, the sixth lens with negative focal power, the seventh lens with positive focal power and the eighth lens with positive focal power are sequentially arranged along the optical axis direction. The 3D structured light camera with the obliquely arranged projection light machine can ensure that the projection image of the whole visual field is clear, and finally improves the point cloud reconstruction precision of the whole visual field.
Description
Technical Field
The invention relates to the field of industrial detection, in particular to a high-resolution oblique image industrial projection lens.
Background
The machine vision technology is applied more and more widely in the field of industrial detection, particularly, three-dimensional scanning is adopted, z-direction data information is introduced, the volume, the flatness or the roughness of an object can be visually detected, and when people need rapid high-precision detection with millimeter to micron resolution, a 3D sensing technology based on structured light is often selected. The three-dimensional sensing is used as a key information input link of intelligent manufacturing and is a new starting point of automation, intellectualization and re-creation of all manufacturing. The 3D structured light camera is a non-contact measuring instrument based on a structured light measuring method, and is mainly realized in a mode that a projection device projects structured light with coded information to a measured object, a camera device is used for recording a structured light image sequence, a specific algorithm is facilitated, and three-dimensional data of the measured object is obtained, a projection lens is an important component of the 3D structured light camera, and projection resolution and distortion influence 3D reconstruction precision, and the 3D structured light camera is particularly critical to measurement and detection.
Projection lenses used for industrial measurement in the prior art are basically positive projection lenses (a lens plane is parallel to a projection object plane and a camera acquisition plane), and if a projection optical machine is obliquely arranged (a lens main surface is not parallel to the projection object plane and has an included angle), the whole image is imaged with a fuzzy area. Projection lens mainly used consumption level projection is used on the market, and the lens also is leading in the working of plastics, easily generates heat, and is big to 3D application point cloud reconsitution precision, and to the 3D structure light camera of projection ray apparatus slant, in order to guarantee whole image formation of image uniformity, ordinary orthographic projection lens can not satisfy industrial needs such as high accuracy measurement and detection, needs a high resolution oblique image camera can satisfy the demand of high accuracy measurement and detection.
Chinese patent CN111239977A specifically discloses a low distortion industrial projection lens, which belongs to the technical field of photoelectric projection, and comprises a diaphragm, a lens with positive focal power and a lens with negative focal power, wherein the lenses are all spherical lenses, first to ninth spherical lenses are sequentially distributed from the projection side to the display chip side along the optical axis, and the diaphragm is located between the third spherical lens and the fourth spherical lens; the working distance of the projection lens is 0-300mm, the working wavelength is 444-. The patent is low distortion realized under the condition of a positive light projector, and does not disclose a technical scheme for solving the problem that a fuzzy area exists in the imaging of the whole image due to the fact that a projection optical machine is obliquely placed.
Chinese patent CN104991329B relates to a high resolution projection lens for industrial 3D scanning system, which mainly comprises an optical lens group, an iris diaphragm assembly, a prism and a chip, and is characterized in that: the optical lens group is provided with a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a cemented lens consisting of a fifth lens with negative focal power and a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with positive focal power in sequence from an object side to an image side, the variable diaphragm assembly is arranged between the fourth lens and the fifth lens, and the prism is arranged between the eighth lens and the chip. This patent is just throwing projection lens, has higher requirement to the position of putting of projection ray apparatus, if the projection ray apparatus put to one side, can have whole picture formation of image to have the problem in fuzzy region.
Disclosure of Invention
The invention provides a high-resolution oblique image industrial projection lens, which aims to solve the problems of fuzzy imaging, low resolution and large aberration of the whole image caused by obliquely placing a projection light machine.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the high-resolution oblique image industrial projection lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a diaphragm, wherein the first lens with positive focal power, the second lens with negative focal power, the third lens with negative focal power, the fourth lens with positive focal power, the fifth lens with positive focal power, the diaphragm, the sixth lens with negative focal power, the seventh lens with positive focal power and the eighth lens with positive focal power are sequentially arranged along the optical axis direction.
Further, the lens focal length range f of the oblique image projection lens is 19mm-37 mm.
Further, a prism and a protective glass are sequentially arranged on the right side of the eighth lens.
Furthermore, the lenses of the lens are all glass lenses.
Further, the ratio of the focal length of the first lens to the focal length of the lens is 1 < f1/f < 2.3.
Further, the ratio of the focal length of the second lens to the focal length of the lens is-2.2 < f2/f < -1.4.
Further, the ratio of the focal length of the third lens to the focal length of the lens is-0.5 < f3/f < -0.3.
Further, the ratio of the focal length of the fourth lens to the focal length of the lens is 0.5 < f4/f < 1.2.
Further, the ratio of the focal length of the fifth lens to the focal length of the lens is 0.5 < f5/f < 0.9.
Furthermore, the ratio of the focal length of the six lenses to the focal length of the lens is-1.1 < f6/f < -0.4.
Further, the ratio of the focal length of the seventh lens to the focal length of the lens is 2.2 < f7/f < 2.8.
Further, the ratio of the focal length of the eighth lens to the focal length of the lens is 0.9 < f8/f < 1.6.
Further, the range of F/# of the oblique image projection lens is 3.8-10.
Furthermore, the entrance pupil aperture range of the oblique image projection lens is 2.1mm-9.3 mm.
Further, the working distance WD of the projection lens is 60mm-500 mm.
Further, the first lens and the sixth lens are used for eliminating spherical aberration and axial chromatic aberration.
Further, the second lens is used for eliminating spherical aberration and coma.
Further, the third and fifth lenses are used for eliminating chromatic aberration of magnification and distortion.
Further, the fourth lens is used for eliminating astigmatism and chromatic aberration of magnification.
Further, the seventh lens and the eighth lens are used for a field region and distortion.
Further, the working wavelength lambda ranges from 440nm to 470 nm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the 3D structured light camera with the obliquely arranged projection light machine meets the condition that the main surface of the projection lens intersects with the projection object plane and the imaging plane and is a line, so that the projection image of the whole visual field can be ensured to be clear, and the point cloud reconstruction precision of the whole visual field is finally improved.
(2) The projection lens has reasonable positive and negative focal power, and can design an oblique image projection lens with ultrahigh resolution, small aberration and distortion of less than 0.2% and with working distance (WD for short) of 60-500 mm.
(3) The invention meets the Samm's law and realizes the clear imaging of the whole inclined object plane lens field of view (FOV).
Drawings
FIG. 1 is a schematic diagram of an eight-lens spherical oblique image projection lens according to the present invention;
FIG. 2 is a schematic diagram of Schlemm's Law imaging;
FIG. 3 is a diagram of a WD 60mm oblique projection lens;
FIG. 4 is a graph of the image quality MTF of an oblique image projection lens with WD 60 mm;
FIG. 5 is a graph of distortion of a 60mm oblique projection lens;
FIG. 6 is a diagram of a projection lens with WD of 200 mm;
FIG. 7 is a graph of the image quality MTF of an oblique projection lens with WD being 200 mm;
FIG. 8 is a graph of distortion of a 200mm tilted image projection lens;
FIG. 9 is a schematic diagram of a projection lens with WD 350mm oblique image;
FIG. 10 is a graph of the image quality MTF of an oblique image projection lens with WD being 350 mm;
FIG. 11 is a graph of distortion of a 350mm tilted image projection lens;
FIG. 12 is a view of a WD-500 mm oblique projection lens;
fig. 13 is a graph of the imaging quality MTF of an oblique image projection lens with WD of 500 mm;
FIG. 14 is a graph of distortion of a 500mm oblique projection lens;
the reference numbers are as follows: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. A fifth lens; 6. a diaphragm; 7. a sixth lens; 8. a seventh lens; 9. an eighth lens; 10. a prism; 11. protecting glass; 12. an image source surface; 13. and projecting the object plane.
Detailed Description
In order to make the purpose and technical solution of the present invention clearer, the following will clearly and completely describe the technical solution of the present invention with reference to the embodiments.
According to the industrial high-resolution oblique image projection lens shown in fig. 1, the industrial high-resolution oblique image projection lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 7, a seventh lens 8, an eighth lens 9 and a diaphragm 6, wherein the first lens 1 with positive focal power, the second lens 2 with negative focal power, the third lens 3 with negative focal power, the fourth lens 4 with positive focal power, the fifth lens 5 with positive focal power, the diaphragm 6, the sixth lens 7 with negative focal power, the seventh lens 8 with positive focal power and the eighth lens 9 with positive focal power are sequentially arranged along the optical axis direction, and a prism 10 and a protective glass 11 are sequentially arranged on the right side of the eighth lens 9. Wherein, the right side of the protective glass 11 is provided with an image source surface 12, and the left side of the first lens 1 is provided with a projection object surface 13.
The focal length range f of the lens of the oblique image projection lens is 19mm-37mm, and the ratio of the focal length of the first lens 1 to the focal length of the lens is 1 < f1/f < 2.3; the ratio of the focal length of the second lens 2 to the focal length of the lens is-2.2 < f2/f < -1.4; the ratio of the focal length of the third lens 3 to the focal length of the lens is-0.5 < f3/f < 0.3; the ratio of the focal length of the fourth lens 4 to the focal length of the lens is more than 0.5 and less than f4/f and less than 1.2; the ratio of the focal length of the fifth lens 5 to the focal length of the lens is more than 0.5 and less than f5/f and less than 0.9; the ratio of the focal length of the six lenses to the focal length of the lens is-1.1 < f6/f < 0.4; the ratio of the focal length of the seventh lens 8 to the focal length of the lens is 2.2 < f7/f < 2.8; the ratio of the focal length of the eighth lens 9 to the focal length of the lens is 0.9 < f8/f < 1.6. The range of F/# of the oblique image projection lens is 3.8-10. The entrance pupil aperture range of the oblique image projection lens is 2.1mm-9.3 mm. The working distance WD of the projection lens is 60mm-500 mm. The working wavelength lambda ranges from 440nm to 470 nm. Specifically, the first lens 1 and the sixth lens 7 are used for eliminating spherical aberration and axial chromatic aberration. The second lens 2 is used for eliminating spherical aberration and coma. The third and fifth lenses 5 are used for eliminating chromatic aberration of magnification and distortion. The fourth lens 4 is used for eliminating astigmatism and chromatic aberration of magnification. The seventh lens 8 and the eighth lens 9 are used for field regions and distortion.
According to the Samm's law, when extension lines of an object plane, a lens main surface and an imaging plane intersect on a plane, and the intersecting plane is unique, as shown in FIG. 2, the whole inclined object plane lens has a clear field of view (FOV) for imaging, and the following Samm relationships are required:
wherein, α is an angle between an object plane and an optical axis of the lens, β is an angle between an imaging plane and the optical axis of the lens, a 'is an object distance of an O point on the optical axis, b' is an image distance of the O point on the optical axis, and b '/a' is a magnification of the lens.
Example 1
A WD (wavelength division multiple) 60mm projection lens is designed by utilizing the 8 spherical focal power structures, the working wavelength lambda ranges from 440nm to 470nm, the lens focal length F is 19.12mm, and F/#is4.5, the detailed design structure is shown in figure 3, and the detailed design parameters are shown in a table (1).
Table (1) WD 60mm oblique image projection lens design parameters
Of which 18 and 19 are prisms 10 and 20 and 21 are cover glasses 11. The included angle α between the object plane and the optical axis is 75.5 degrees, the included angle β between the imaging plane and the optical axis is 87.07 degrees, that is, tan α/tan β is 0.1982, and the lens magnification b '/a': 0.1982, which satisfy the scheimpflug formula (1). Fig. 4 is a graph of imaging quality MTF of a 60mm oblique projection lens, all fields are close to diffraction limit, which indicates that imaging reaches the limit, and sufficient space is left for processing, so that high-resolution imaging can be ensured. Fig. 5 is a distortion plot of a 60mm WD oblique projection lens with less than 0.1% distortion at full field of view, where the abscissa of the distortion plot represents the percentage and the ordinate represents the field of view. In conclusion, the oblique image projection lens design has the advantages of full-field ultrahigh-resolution imaging, small aberration and low distortion.
Example 2
A WD (wavelength division multiplexing) projection lens is designed by utilizing the 8 spherical focal power structures, the working wavelength lambda ranges from 440nm to 470nm, the lens focal length F is 36mm, F/#is4.5, the detailed design structure is shown in figure 6, and the detailed design parameters are shown in a table (2).
Table (2) WD 200mm oblique image projection lens design parameters
Of which 18 and 19 are prisms 10 and 20 and 21 are cover glasses 11. The included angle α between the object plane and the optical axis is 74.54122 degrees, the included angle β between the imaging plane and the optical axis is 87.5 degrees, that is, tan α/tan β is 0.15788, and the lens magnification b '/a'/0.15788 satisfies the scheimpflug formula (1). Fig. 7 is a graph of the imaging quality MTF of a 200mm diagonal projection lens with the entire field of view approaching the diffraction limit, and fig. 8 is a graph of the distortion of a 200mm diagonal projection lens with less than 0.1% distortion at the full field of view, where the abscissa of the distortion graph represents the percentage and the ordinate represents the field of view. In conclusion, the oblique image projection lens design has the advantages of full-field ultrahigh-resolution imaging, small aberration and low distortion.
Example 3
A WD 350mm projection lens is designed by utilizing the 8 spherical focal power structures, the value range of the working wavelength lambda is 440nm-470nm, the focal length F of the lens is 36mm, and F/#is4.5, the detailed design structure is shown in figure 9, and the detailed design parameters are shown in a table (3).
Table (3) WD 350mm oblique image projection lens design parameters
Of which 18 and 19 are prisms 10 and 20 and 21 are cover glasses 11. The included angle α between the object plane and the optical axis is 65.45 degrees, the included angle β between the imaging plane and the optical axis is 87.5 degrees, i.e., tan α/tan β is 0.09559, and the lens magnification b '/a'/0.09559 satisfy the schemer equation (1). Fig. 10 is a graph of the imaging quality MTF of the 350mm oblique projection lens with WD, the entire field of view is close to the diffraction limit, fig. 11 is a graph of the distortion of the 350mm oblique projection lens with WD, the distortion is less than 0.1% in the entire field of view, wherein the abscissa of the distortion graph represents the percentage and the ordinate represents the field of view. In conclusion, the oblique image projection lens design has the advantages of full-field ultrahigh-resolution imaging, small aberration and low distortion.
Example 4
A WD (wavelength division multiple access) 500mm projection lens is designed by utilizing the 8 spherical focal power structures, the value range of the working wavelength lambda is 440nm-470nm, the focal length F of the lens is 34mm, and F/#is4.5, the detailed design structure is shown in figure 12, and the detailed design parameters are shown in a table (4).
Table (4) WD 500mm oblique image projection lens design parameters
Of which 18 and 19 are prisms 10 and 20 and 21 are cover glasses 11. The included angle α between the object plane and the optical axis is 56.0754 degrees, the included angle β between the imaging plane and the optical axis is 87.5 degrees, i.e., tan α/tan β is 0.0649, and the lens magnification b '/a'/0.0649 satisfy the schemer equation (1). Fig. 13 is a graph of the imaging quality MTF of a 500mm WD oblique projection lens, the entire field of view being close to the diffraction limit, and fig. 14 is a graph of the distortion of a 500mm WD oblique projection lens, the distortion being less than 0.2% at the full field of view, wherein the abscissa of the distortion graph represents the percentage and the ordinate represents the field of view. In conclusion, the oblique image projection lens design has the advantages of full-field ultrahigh-resolution imaging, small aberration and low distortion.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (8)
1. The industrial high-resolution oblique image projection lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a diaphragm, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the diaphragm, the sixth lens, the seventh lens and the eighth lens are sequentially arranged along the optical axis direction, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the diaphragm, the sixth lens and the seventh lens are respectively provided with positive focal power; the oblique image industrial projection lens comprises eight lenses with focal power;
the ratio of the focal length of the first lens to the focal length of the lens is 1 < f1/f < 2.3; the ratio of the focal length of the second lens to the focal length of the lens is-2.2 < f2/f < 1.4; the ratio of the focal length of the third lens to the focal length of the lens is-0.5 < f3/f < 0.3; the ratio of the focal length of the fourth lens to the focal length of the lens is more than 0.5 and less than f4/f and less than 1.2; the ratio of the focal length of the fifth lens to the focal length of the lens is more than 0.5 and less than f5/f and less than 0.9; the ratio of the focal length of the six lenses to the focal length of the lens is-1.1 < f6/f < 0.4; the ratio of the focal length of the seventh lens to the focal length of the lens is 2.2 < f7/f < 2.8; the ratio of the focal length of the eighth lens to the focal length of the lens is 0.9 < f8/f < 1.6.
2. The industrial high-resolution oblique image projection lens as claimed in claim 1, wherein the lens focal length f of the industrial high-resolution oblique image projection lens is in the range of 19mm to 37 mm.
3. The industrial projection lens with high resolution oblique image of claim 1, wherein the F/# of the industrial projection lens with high resolution oblique image is in the range of 3.8-10.
4. The industrial high-resolution oblique image projection lens of claim 3, wherein the F/# of the industrial oblique image projection lens is 4.5.
5. The industrial high-resolution oblique image projection lens according to claim 1, wherein the working distance WD of the industrial oblique image projection lens is 60mm-500 mm.
6. The industrial high-resolution oblique image projection lens according to claim 5, wherein the working distance WD of the industrial oblique image projection lens is selected to be 60mm or 200 mm.
7. The industrial high-resolution oblique image projection lens according to claim 1, wherein the entrance pupil aperture of the industrial oblique image projection lens is in the range of 2.1mm to 9.3 mm.
8. The industrial high-resolution oblique image projection lens as claimed in claim 1, wherein the operating wavelength range of the industrial oblique image projection lens is 440nm-470 nm.
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| JP3245297B2 (en) * | 1994-04-19 | 2002-01-07 | 京セラ株式会社 | Small zoom lens |
| JP5384415B2 (en) * | 2010-04-05 | 2014-01-08 | 富士フイルム株式会社 | Wide angle lens for projection and projection display device |
| CN102566015A (en) * | 2010-12-29 | 2012-07-11 | 凤凰光学(上海)有限公司 | Lens of fixed focus type projector |
| CN207937678U (en) * | 2018-03-27 | 2018-10-02 | 视科光电科技（深圳）有限公司 | Camera lens module and 3D printer |
| CN111239977B (en) * | 2020-03-16 | 2022-03-22 | 苏州中科全象智能科技有限公司 | Low-distortion industrial projection lens |
| CN112269242B (en) * | 2020-11-23 | 2022-07-22 | 中国科学院自动化研究所苏州研究院 | High-resolution oblique image lens |
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