CN115185063B - Large-aperture optical lens and imaging method thereof - Google Patents
Large-aperture optical lens and imaging method thereof Download PDFInfo
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- CN115185063B CN115185063B CN202210831401.6A CN202210831401A CN115185063B CN 115185063 B CN115185063 B CN 115185063B CN 202210831401 A CN202210831401 A CN 202210831401A CN 115185063 B CN115185063 B CN 115185063B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 47
- 238000003384 imaging method Methods 0.000 title claims abstract description 10
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 102100034112 Alkyldihydroxyacetonephosphate synthase, peroxisomal Human genes 0.000 description 1
- 101000799143 Homo sapiens Alkyldihydroxyacetonephosphate synthase, peroxisomal Proteins 0.000 description 1
- 238000000848 angular dependent Auger electron spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a large aperture optical lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, the sixth lens has negative focal power, and the seventh lens is a biconvex positive lens. The seven-piece glass-plastic mixed structure and the multi-piece aspheric surface design are adopted, so that the imaging quality is excellent, and particularly, the peripheral visual field image quality is greatly improved. The field of view reaches 200 degrees, and a monitoring field of view without dead angles can be provided. F number is as low as 1.6, which can exhibit higher brightness and better optical performance.
Description
Technical Field
The invention relates to a large aperture optical lens and an imaging method thereof.
Background
The all-round view lens is already standard of ADAS products and new generation 'intelligent' automobiles, and 6-8 all-round view lenses are required to be carried on average for each automobile to realize full-view monitoring. However, the current optical solutions still have drawbacks, such as generally smaller aperture, lower peripheral illumination, lower peripheral field image quality, and the like.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical problem to be solved by the invention is to provide a large-aperture optical lens and an imaging method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the large aperture optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, the sixth lens has negative focal power, and the seventh lens is a biconvex positive lens.
Preferably, the first lens and the fifth lens are glass lenses, and the second, third, fourth, sixth and seventh lenses are plastic lenses.
Preferably, the sixth lens and the seventh lens are cemented with each other into a cemented positive lens group.
Preferably, the focal length of the optical system is set to be f, and the focal lengths of the first lens, the second lens, the fifth lens and the cemented lens are respectively set to be f 1 、f 2 、f 5 Fc, where f 1 、f 2 、f 5 Fc and f satisfy the following ratios: -5.9<f 1 /f<-5.1，-3.9<f 2 /f<-2.7，3.0<f 5 /f<4.5，5.1<fc/f<9.5。
Preferably, the first lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the third lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the fourth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the sixth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is an abbe constant.
Preferably, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are aspheric lenses; the aspherical curve equation expression is:
wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1 、α 2 、α 3 、α 4 、α 5 、α 6 、α 7 、α 8 Are all high order term coefficients.
Preferably, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 13.75.
Preferably, the F number of the optical system is less than or equal to 1.6.
Preferably, the half image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is not less than 1.91.
An imaging method of a large aperture optical lens comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens and the seventh lens from left to right and then are imaged.
Compared with the prior art, the invention has the following beneficial effects: the seven-piece glass-plastic mixed structure and the multi-piece aspheric surface design are adopted, so that the imaging quality is excellent, and particularly, the peripheral visual field image quality is greatly improved. The field of view reaches 200 degrees, and a monitoring field of view without dead angles can be provided. F number is as low as 1.6, which can exhibit higher brightness and better optical performance.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of an optical structure of a first embodiment of the present invention;
fig. 2 is an MTF performance diagram of an operating band according to a first embodiment of the present invention;
FIG. 3 is a graph of axial chromatic aberration, curvature of field, and distortion of an operating band in accordance with a first embodiment of the present invention;
FIG. 4 is a schematic view of an optical structure of a second embodiment of the present invention;
fig. 5 is an MTF performance diagram of an operating band according to a second embodiment of the present invention;
fig. 6 is a graph of axial chromatic aberration, curvature of field, and distortion of an operating band in accordance with a second embodiment of the present invention.
In the figure: l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; STO-diaphragm; l5-fifth lens; l6-sixth lens; l7-seventh lens; l8-equivalent glass plate; IMA-imaging plane.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. 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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 6, the present embodiment provides a large aperture optical lens, including a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens, which are sequentially disposed from left to right along a light incident path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, the sixth lens has negative focal power, and the seventh lens is a biconvex positive lens.
In the embodiment of the invention, the first lens and the fifth lens are glass lenses, and the second, third, fourth, sixth and seventh lenses are plastic lenses.
In the embodiment of the invention, the sixth lens and the seventh lens are mutually glued to form a glued positive lens group.
In the embodiment of the invention, the focal length of the optical system is set to be f, and the focal lengths of the first lens, the second lens, the fifth lens and the cemented lens are respectively set to be f 1 、f 2 、f 5 Fc, where f 1 、f 2 F5, fc and f satisfy the following ratios: -5.9<f 1 /f<-5.1，-3.9<f 2 /f<-2.7，3.0<f 5 /f<4.5，5.1<fc/f<9.5。
In the embodiment of the present invention, the first lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the third lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the fourth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the sixth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is an abbe constant.
In the embodiment of the invention, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are aspheric lenses; the aspherical curve equation expression is:
wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1 、α 2 、α 3 、α 4 、α 5 、α 6 、α 7 、α 8 Are all higher order termsCoefficients.
In the embodiment of the present invention, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 13.75.
In the embodiment of the invention, the F number of the optical system is less than or equal to 1.6.
In the embodiment of the invention, the half image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is not less than 1.91.
An imaging method of a large aperture optical lens comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens and the seventh lens from left to right and then are imaged.
The specific implementation process comprises the following steps: embodiment one:
the technical indexes of the optical system implementation of the embodiment are as follows:
(1) Focal length: EFFL is less than or equal to 1.00mm and less than or equal to 1.42mm; (2) aperture F is less than or equal to 1.6.
In order to achieve the above design parameters, the specific designs adopted by the optical system of this embodiment are shown in the following table:
the aspherical coefficients of the respective aspherical lenses of the optical system of the present embodiment are as follows:
embodiment two:
the technical indexes of the optical system implementation of the embodiment are as follows:
(1) Focal length: EFFL is more than or equal to 0.98mm and less than or equal to 1.32mm; (2) aperture F is less than or equal to 1.6.
In order to achieve the above design parameters, the specific designs adopted by the optical system of this embodiment are shown in the following table:
the aspherical coefficients of the respective aspherical lenses of the optical system of the present embodiment are as follows:
the above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a big light ring optical lens which characterized in that: the lens consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path; the first lens is a meniscus negative lens, the second lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, the sixth lens has negative focal power, the seventh lens is a biconvex positive lens, the third lens has negative focal length, and the fourth lens has positive focal length; the sixth lens and the seventh lens are mutually glued to form a glued positive lens group; setting the focal length of the optical system as f, and the focal lengths of the first lens, the second lens, the fifth lens and the cemented lens are respectively f 1 、f 2 、f 5 Fc, where f 1 、f 2 、f 5 Fc and f satisfy the following ratios: -5.9<f 1 /f<-5.1，-3.9<f 2 /f<-2.7，3.0<f 5 /f<4.5，5.1<fc/f<9.5; the first lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the second lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the third lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the fourth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the fifth lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; the sixth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50.0; the seventh lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50.0; wherein N is d Is of refractive index, V d Is an Abbe constant; the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are aspheric lenses; the aspherical curve equation expression is:
wherein Z is the altitude of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha 1 、α 2 、α 3 、α 4 、α 5 、α 6 、α 7 、α 8 Are all high order term coefficients;
the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL/f is less than or equal to 13.75; f number of the optical system is less than or equal to 1.6; the half image height ImaH of the optical system and the focal length f of the optical system satisfy: imaH/f is not less than 1.91.
2. The large aperture optical lens of claim 1, wherein: the first lens and the fifth lens are glass lenses, and the second, third, fourth, sixth and seventh lenses are plastic lenses.
3. A method of imaging a large aperture optical lens as claimed in any one of claims 1-2, comprising the steps of: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens and the seventh lens from left to right and then are imaged.
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| CN202210831401.6A CN115185063B (en) | 2022-07-14 | 2022-07-14 | Large-aperture optical lens and imaging method thereof |
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| CN202210831401.6A CN115185063B (en) | 2022-07-14 | 2022-07-14 | Large-aperture optical lens and imaging method thereof |
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| CN115185063B true CN115185063B (en) | 2024-01-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005321426A (en) * | 2004-05-06 | 2005-11-17 | Nidec Copal Corp | Zoom lens |
| CN211318866U (en) * | 2020-01-17 | 2020-08-21 | 东莞市宇瞳光学科技股份有限公司 | Optical lens |
| CN113625435A (en) * | 2021-10-09 | 2021-11-09 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
| CN113900238A (en) * | 2021-12-10 | 2022-01-07 | 江西联创电子有限公司 | Optical lens and imaging apparatus |
| CN114047597A (en) * | 2021-11-03 | 2022-02-15 | 福建福光股份有限公司 | Fixed-focus optical lens and imaging method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123479A (en) * | 2020-01-17 | 2020-05-08 | 东莞市宇瞳光学科技股份有限公司 | Optical lens |
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- 2022-07-14 CN CN202210831401.6A patent/CN115185063B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005321426A (en) * | 2004-05-06 | 2005-11-17 | Nidec Copal Corp | Zoom lens |
| CN211318866U (en) * | 2020-01-17 | 2020-08-21 | 东莞市宇瞳光学科技股份有限公司 | Optical lens |
| CN113625435A (en) * | 2021-10-09 | 2021-11-09 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
| CN114047597A (en) * | 2021-11-03 | 2022-02-15 | 福建福光股份有限公司 | Fixed-focus optical lens and imaging method thereof |
| CN113900238A (en) * | 2021-12-10 | 2022-01-07 | 江西联创电子有限公司 | Optical lens and imaging apparatus |
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