CN114063253B - Zero-chromatic-aberration optical lens and imaging method thereof - Google Patents
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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Abstract
The invention provides a zero-chromatic aberration optical lens which is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, an optical filter and protective glass which are sequentially arranged from front to back along an incident light path. The invention has reasonable design, excellent image quality, extremely low distortion and chromatic aberration, and full-wave band imaging quality close to the diffraction limit, which is enough to meet the requirements of various scientific researches and industrial production; the glass-plastic system has stronger structure and optical stability compared with a large number of glass-plastic or all-plastic systems in the current market by adopting a full-glass design; the working wavelength covers visible light and near infrared wave bands, and can adapt to more complex application scenes; all optical surfaces are designed in a spherical surface mode, and production and assembly costs are greatly reduced.
Description
Technical Field
The invention relates to a zero-chromatic-aberration optical lens and an imaging method thereof.
Background
Industrial lenses, as a core component of a machine vision system, are widely used in the fields of flaw and defect detection, optical measurement, 3D scanning, and even medicine. In consideration of the precision requirements of the application scenarios, the current market continuously demands industrial lenses with low distortion, low dispersion and large depth of field. The study of optical systems having the above-mentioned technical features has also been a major issue at present.
Disclosure of Invention
In view of the above, the present invention provides a zero-aberration optical lens and an imaging method thereof, which have excellent image quality, extremely low distortion and chromatic aberration, and full-band imaging quality close to the diffraction limit, and are sufficient for various scientific research and industrial production requirements; the glass-plastic system has stronger structure and optical stability compared with a large number of glass-plastic or all-plastic systems in the current market by adopting a full-glass design; the working wavelength covers visible light and near infrared wave bands, and can adapt to more complex application scenes; all optical surfaces adopt spherical surface design, thereby greatly reducing the production and assembly cost.
The invention is realized by adopting the following scheme: the optical lens consists of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, an optical filter and protective glass which are sequentially arranged from front to back along an incident light path.
Further, the first lens element L1 is a biconvex positive lens element, the second lens element L2 is a meniscus negative lens element, the third lens element L3 is a biconvex positive lens element, the fourth lens element L4 is a biconcave negative lens element, the fifth lens element L5 is a meniscus positive lens element, the sixth lens element L6 is a biconcave negative lens element, and the seventh lens element L7 is a biconvex positive lens element, and the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are all made of glass.
Further, the air space between the first lens L1 and the second lens L2 is 0.1 to 1.0mm, the air space between the second lens L2 and the third lens L3 is 0.1 to 1.0mm, the air space between the third lens L3 and the fourth lens L4 is 0.1 to 1.0mm, the air space between the fourth lens L4 and the fifth lens L5 is 0.1 to 1.0mm, the air space between the fifth lens L5 and the sixth lens L6 is 1.0 to 2.0mm, the air space between the sixth lens L6 and the diaphragm is 5.8 to 6.8mm, and the air space between the diaphragm and the seventh lens L7 is 7.0 to 8.0mm.
Further, the focal length of the optical lens is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are respectively f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Wherein f is 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 And f satisfy the following ratio: 0.5<f 1 /f<1.0；-1.0<f 2 /f<-0.1；0.1<f 3 /f<0.7；-0.5<f 4 /f<0.1；0.1<f 5 /f<1.0；-0.5<f 6 /f<0.5；0.1<f 7 /f<0.9。
Further, the first lens L1 satisfies the relation: n is a radical of d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n is a radical of d ≥1.6，V d Less than or equal to 50.0; the third lens satisfies the relation: n is a radical of d ≤1.5，V d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of hydrogen d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n is a radical of d ≤1.5，V d Less than or equal to 50.0; the sixth lens satisfies the relation: n is a radical of d ≥1.6，V d Less than or equal to 40.0; the seventh lens satisfies the relation: n is a radical of d ≥1.5，V d Not less than 50; wherein N is d Is refractive index, V d Abbe constant.
Furthermore, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all designed to be spherical.
Further, an optical total length TTL of the optical lens and a focal length f of the optical system satisfy: TTL/f is less than or equal to 1.15.
An imaging method of a zero-chromatic-aberration optical lens comprises the following steps: the light rays sequentially pass through a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, a light filter and protective glass from an object space to form an image on an imaging surface.
Compared with the prior art, the invention has the following beneficial effects: (1) By adopting the 7G full-glass structure design, the optical performance is more stable, the structure is simpler, the tolerance sensitivity is lower, the assembly is easy, the cost is lower, and the method is more suitable for large-scale high-yield production; (2) The working wavelength covers visible light and near infrared wave bands, and complex illumination conditions such as dark light, night and the like can be better met; (3) The image quality is excellent, and the imaging quality close to zero distortion and zero chromatic aberration is obtained in the full field of view; (4) The surface type design is reasonable, the incident angle of light on each optical surface can be controlled, and the tolerance sensitivity is further reduced; (5) All optical surfaces are designed in a spherical surface mode, and production and assembly costs are greatly reduced.
Drawings
FIG. 1 is a schematic diagram of an optical configuration of an embodiment of the present invention;
FIG. 2 is a graph of axial chromatic aberration for an embodiment of the present invention;
FIG. 3 is a vertical axis color difference plot of an embodiment of the present invention;
FIG. 4 is a field curvature distortion diagram according to an embodiment of the present invention.
In the figure: l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; l5-a fifth lens; l6-sixth lens; STO-stop; l7-seventh lens, L8-optical filter; l9-protective glass; IMG — imaging plane.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure herein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1-2, the present embodiment provides a zero-aberration optical lens, which is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, an optical filter, and a protective glass, which are sequentially disposed along an incident light path from front to back.
In this embodiment, the first lens element L1 is a biconvex positive lens element, and both the object-side surface and the image-side surface thereof are concave surfaces; the second lens L2 is a meniscus negative lens, the object side surface of which is convex, and the image side surface of which is concave; the third lens element L3 is a biconvex positive lens element, and both the object-side surface and the image-side surface thereof are concave surfaces; the fourth lens L4 is a biconcave negative lens, and the object side surface and the image side surface of the fourth lens are both concave surfaces; the fifth lens element L5 is a meniscus positive lens element, which has a convex object-side surface and a concave image-side surface; the sixth lens element L6 is a negative biconcave lens element, both of which have concave object-side and image-side surfaces; the seventh lens element L7 is a biconvex positive lens element, and has a convex object-side surface and a convex image-side surface; the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all made of glass.
In this embodiment, the air space between the first lens L1 and the second lens L2 is 0.1 to 1.0mm, the air space between the second lens L2 and the third lens L3 is 0.1 to 1.0mm, the air space between the third lens L3 and the fourth lens L4 is 0.1 to 1.0mm, the air space between the fourth lens L4 and the fifth lens L5 is 0.1 to 1.0mm, the air space between the fifth lens L5 and the sixth lens L6 is 1.0 to 2.0mm, the air space between the sixth lens L6 and the diaphragm is 5.8 to 6.8mm, and the air space between the diaphragm and the seventh lens L7 is 7.0 to 8.0mm.
In this embodiment, the focal length of the optical lens is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are respectively f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Wherein f is 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 And f satisfy the following ratio: 0.5<f 1 /f<1.0；-1.0<f 2 /f<-0.1；0.1<f 3 /f<0.7；-0.5<f 4 /f<0.1；0.1<f 5 /f<1.0；-0.5<f 6 /f<0.5；0.1<f 7 /f<0.9。
In this embodiment, the first lens L1 satisfies the relation：N d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n is a radical of d ≥1.6，V d Less than or equal to 50.0; the third lens satisfies the relation: n is a radical of d ≤1.5，V d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n is a radical of d ≤1.5，V d Less than or equal to 50.0; the sixth lens satisfies the relation: n is a radical of hydrogen d ≥1.6，V d Less than or equal to 40.0; the seventh lens satisfies the relation: n is a radical of d ≥1.5，V d Not less than 50; wherein N is d Is refractive index, V d Abbe constant.
In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all designed to be spherical.
In this embodiment, the total optical length TTL of the optical lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 1.15.
In this embodiment, the operating wavelength of the optical system covers visible light and near infrared bands.
In this embodiment, a filter L8 is disposed behind the seventh lens L7, and a protection glass L9 is disposed behind the filter.
Table 1 shows the radius of curvature R, thickness d, and refractive index N of each lens of the optical system of example 1 d And Abbe number V d 。
TABLE 1 detailed lens parameters Table
Table 2 shows the optical back focus variation for the optical system of example 1 at different object distances.
TABLE 2 back focal length-dependent change table
| Intercept/mm of object | INFINITY | 20000 | 3000 |
| Optical back focus/mm | 45.43 | 45.71 | 47.31 |
In this embodiment, the technical indexes of the optical system are as follows:
(1) Focal length: EFFL =74.5mm; (2) aperture F =4.8; (3) angle of view: 2w is more than or equal to 7.0 degrees; (4) the diameter of the imaging circle is larger than phi 9mm; (5) working wave band: visible light and near infrared; (6) The total optical length TTL is less than or equal to 86.1mm, and the optical back intercept BFL is more than or equal to 45.4mm.
As can be seen from FIGS. 2 and 3, the maximum axial chromatic aberration of the optical system in the full operating band is less than 0.018mm; the maximum vertical axis chromatic aberration is less than 0.55um, so that the vertical axis chromatic aberration and the axial chromatic aberration of the invention are well corrected. Meanwhile, the maximum distortion of the system is less than 0.05 percent. In conclusion, the invention has extremely high imaging quality and can meet various requirements of scientific research and industrial production.
An imaging method of a zero-chromatic-aberration optical lens comprises the following steps: the light rays sequentially pass through a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, a light filter and protective glass from an object space to form an image on an imaging surface.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, the orientations or positional relationships indicated for indicating the positional relationships such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., applied in any one of the technical aspects of the present disclosure described above are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present disclosure, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present disclosure, and the terms used for indicating the shape applied in any one of the technical aspects of the present disclosure described above include shapes similar, similar or approximate thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (6)
1. A zero-chromatic aberration optical lens is characterized in that the optical lens consists of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm, a seventh lens L7, an optical filter and protective glass which are sequentially arranged from front to back along an incident light path;
the total optical length TTL of the optical lens and the focal length f of the optical lens meet the following conditions: TTL/f is less than or equal to 1.15;
the focal length of the optical lens is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are respectively f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Wherein f is 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 And f satisfy the following ratio: 0.5<f 1 /f<1.0；-1.0<f 2 /f<-0.1；0.1<f 3 /f<0.7；-0.5<f 4 /f<0.1；0.1<f 5 /f<1.0；-0.5<f 6 /f<0.5；0.1<f 7 /f<0.9。
2. The optical lens assembly with zero aberration as claimed in claim 1, wherein the first lens element L1 is a biconvex positive lens element, the second lens element L2 is a meniscus negative lens element, the third lens element L3 is a biconvex positive lens element, the fourth lens element L4 is a biconcave negative lens element, the fifth lens element L5 is a meniscus positive lens element, the sixth lens element L6 is a biconcave negative lens element, and the seventh lens element L7 is a biconvex positive lens element, and the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are made of glass.
3. The optical lens assembly with zero chromatic aberration of claim 2, wherein an air space between the first lens L1 and the second lens L2 is 0.1 to 1.0mm, an air space between the second lens L2 and the third lens L3 is 0.1 to 1.0mm, an air space between the third lens L3 and the fourth lens L4 is 0.1 to 1.0mm, an air space between the fourth lens L4 and the fifth lens L5 is 0.1 to 1.0mm, an air space between the fifth lens L5 and the sixth lens L6 is 1.0 to 2.0mm, an air space between the sixth lens L6 and the stop is 5.8 to 6.8mm, and an air space between the stop and the seventh lens L7 is 7.0 to 8.0mm.
4. A zero-aberration optical lens according to claim 3, wherein the first lens L1 satisfies the relationship: n is a radical of hydrogen d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n is a radical of d ≥1.6，V d Less than or equal to 50.0; the third lens satisfies the relation: n is a radical of d ≤1.5，V d Not less than 50.0; the fourth lens satisfies the relation: n is a radical of d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n is a radical of d ≤1.5，V d Less than or equal to 50.0; the sixth lens satisfies the relation: n is a radical of d ≥1.6，V d Less than or equal to 40.0; the seventh lens satisfies the relation: n is a radical of d ≥1.5，V d Not less than 50; wherein N is d Is refractive index, V d Abbe constant.
5. The optical lens assembly as claimed in claim 4, wherein the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are all designed to be spherical.
6. The imaging method of the zero-chromatic-aberration optical lens is adopted by the zero-chromatic-aberration optical lens as claimed in claim 5, wherein light rays sequentially pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the diaphragm, the seventh lens L7, the optical filter and the protective glass from an object side to reach an imaging surface for imaging.
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| JP4076334B2 (en) * | 2001-10-15 | 2008-04-16 | 日東光学株式会社 | Projection lens |
| CN107167899A (en) * | 2017-06-30 | 2017-09-15 | 东莞市宇瞳光学科技股份有限公司 | A kind of wide working distance machine visual lens of small-sized focal length |
| TWI714852B (en) * | 2018-05-23 | 2021-01-01 | 先進光電科技股份有限公司 | Optical image capturing system |
| CN110133828B (en) * | 2019-04-28 | 2021-04-06 | 江西联创电子有限公司 | Fixed focus lens |
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