CN110989147B - Small-size day-night confocal wide-angle lens and working method thereof - Google Patents
Small-size day-night confocal wide-angle lens and working method thereof Download PDFInfo
- Publication number
- CN110989147B CN110989147B CN201911305381.3A CN201911305381A CN110989147B CN 110989147 B CN110989147 B CN 110989147B CN 201911305381 A CN201911305381 A CN 201911305381A CN 110989147 B CN110989147 B CN 110989147B
- Authority
- CN
- China
- Prior art keywords
- lens
- plastic aspheric
- glass spherical
- positive lens
- day
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a small-size day-night confocal wide-angle lens and a working method thereof, and the wide-angle lens comprises a front lens group A-0, a diaphragm B-0 and a rear lens group C-0 which are sequentially arranged from left to right along an object space to an image space, wherein the front lens group A-0 comprises a glass spherical meniscus negative lens A-1 and a glass spherical meniscus positive lens A-2 which are sequentially arranged; the rear lens group C-0 comprises a plastic aspheric biconvex positive lens C-1, a plastic aspheric biconcave negative lens C-2 and a plastic aspheric biconvex positive lens C-3 which are sequentially arranged, and the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 form a combined sheet. The invention has the advantages of reasonable structure, simple and convenient operation, light weight, small volume and good day and night confocal effect.
Description
Technical Field
The invention relates to a small-size day-night confocal wide-angle lens and a working method thereof.
Background
The wide-angle lens is an important component of a camera, and through development of many years, the low-end products with multiple lenses, high assembly difficulty, low optical index and the like in the early stage gradually transit to the economic high-index wide-angle lens. However, most wide-angle lenses in the current market still have the problems of large size, high cost, light weight of finished products, miniaturization, poor day and night confocal effect and the like.
Disclosure of Invention
In view of this, the present invention provides a small-sized day-night confocal wide-angle lens and a working method thereof, which have the advantages of reasonable structure, simple operation, light weight, small size and good day-night confocal effect.
The technical scheme of the invention is as follows: a small-size day-night confocal wide-angle lens comprises a front lens group A-0, a diaphragm B-0 and a rear lens group C-0 which are sequentially arranged from left to right along an object space to an image space, wherein the front lens group A-0 comprises a glass spherical meniscus negative lens A-1 and a glass spherical meniscus positive lens A-2 which are sequentially arranged; the rear lens group C-0 comprises a plastic aspheric biconvex positive lens C-1, a plastic aspheric biconcave negative lens C-2 and a plastic aspheric biconvex positive lens C-3 which are sequentially arranged, and the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 form a combined sheet.
Further, along the direction from the object space to the image space from left to right, the air space between the glass spherical meniscus negative lens A-1 and the glass spherical meniscus positive lens A-2 is 2.17mm, the air space between the glass spherical meniscus positive lens A-2 and the diaphragm B-0 is 0.1mm, the air space between the diaphragm B-0 and the plastic aspheric double-convex positive lens C-1 is 1.44mm, and the air space between the plastic aspheric double-convex positive lens C-1 and the plastic aspheric double-concave negative lens C-2 is 1.15 mm.
Further, setting the focal length of the lens to be f; the focal lengths of the lenses from the object plane to the image plane are f1, f2, f3, f4 and f5 in sequence, and the following relations are satisfied: -1.6< f1/f < -1.2; -26< f2/f1< -22; 0.01< f3/f2< 0.05; -1< f4/f3< -0.5; -1< f5/f4< -1.5.
Further, the abbe numbers of the materials of the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 are respectively v4 and v5, and the refractive indexes are respectively n4 and n5, which satisfy the following relations: 20< v4< 30; 50< v5< 60; 1.6< n4< 1.7; 1.5< n5< 1.6.
Further, a parallel flat plate and an IMA image surface are sequentially arranged at the rear end of the plastic aspheric double convex positive lens C-3.
The invention provides another technical scheme that the working method of the day and night confocal wide-angle lens with small volume comprises the following steps: when light rays enter, the light path sequentially enters the front lens group A-0, the diaphragm B-0 and the rear lens group C-0 to be imaged, and when the light rays pass through the glass spherical meniscus negative lens A-1, the glass spherical meniscus negative lens A-1 mainly bears a larger field angle for negative focal power, so that the field angles born by the four rear lenses are compressed; when light passes through the glass spherical positive meniscus lens A-2, the glass spherical positive meniscus lens A-2 can better correct field curvature; when light passes through the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3, the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 can reasonably match with the refractive index and the Abbe number of plastic, so that chromatic aberration and high-level aberration of the system can be well corrected.
Compared with the prior art, the invention has the beneficial effects that: (1) the invention has reasonable structure, simple and convenient operation, light weight, small volume and good day and night confocal effect; (2) through the combination of the glass lens and the plastic lens and the matching of the materials of all the lenses, the problem of inconsistent day and night confocal resolving power of the lens is effectively solved by adopting a structural form of 2G3P, and day and night confocal is realized; (3) on the premise of ensuring high resolution, the lens only uses two glass lenses and three plastic aspheric surfaces, and the similar products in the market are generally six glass lenses or two glass lenses and four plastic aspheric surfaces, so the lens has the advantages of obviously simplifying the structure, reducing the weight of the lens and reducing the production cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a schematic view of 20 ℃ 486 nm-656 nmMTF of an embodiment of the present invention;
FIG. 3 is a schematic diagram of 20 deg. night vision 850nmMTF of an embodiment of the present invention.
Detailed Description
As shown in fig. 1 to 3, a small-sized day-night confocal wide-angle lens comprises a front lens group a-0, a diaphragm B-0 and a rear lens group C-0 which are sequentially arranged from left to right along an object space to an image space, wherein the front lens group a-0 comprises a glass spherical meniscus negative lens a-1 and a glass spherical meniscus positive lens a-2 which are sequentially arranged; the rear lens group C-0 comprises a plastic aspheric biconvex positive lens C-1, a plastic aspheric biconcave negative lens C-2 and a plastic aspheric biconvex positive lens C-3 which are sequentially arranged, and the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 form a combined sheet.
In this embodiment, along the direction from the object side to the image side from left to right, the air space between the glass spherical meniscus negative lens a-1 and the glass spherical meniscus positive lens a-2 is 2.17mm, the air space between the glass spherical meniscus positive lens a-2 and the diaphragm B-0 is 0.1mm, the air space between the diaphragm B-0 and the plastic aspheric biconvex positive lens C-1 is 1.44mm, and the air space between the plastic aspheric biconvex positive lens C-1 and the plastic aspheric biconcave negative lens C-2 is 1.15 mm.
In this embodiment, the focal length of the lens is set to f; the focal lengths of the lenses from the object plane to the image plane are f1, f2, f3, f4 and f5 in sequence, and the following relations are satisfied: -1.6< f1/f < -1.2; -26< f2/f1< -22; 0.01< f3/f2< 0.05; -1< f4/f3< -0.5; -1< f5/f4< -1.5.
In this embodiment, the abbe numbers of the materials of the plastic aspherical biconcave negative lens C-2 and the plastic aspherical biconvex positive lens C-3 are respectively v4 and v5, and the refractive indices are respectively n4 and n5, which satisfy the following relationships: 20< v4< 30; 50< v5< 60; 1.6< n4< 1.7; 1.5< n5< 1.6.
In this embodiment, a parallel flat plate and an IMA image plane are further sequentially disposed at the rear end of the plastic aspheric biconvex positive lens C-3.
TABLE 1 specific lens parameters are as follows
In this embodiment, the technical indexes of the optical system are as follows: (1) focal length: EFFL =2.8 mm; (2) f number = 2; (3) the field angle: 2w =130 °; (4) the diameter of the imaging circle is larger than phi 6.6 mm; (5) the relative illumination is more than 42%; (6) the incident angle of the chief ray is less than 15.3 degrees; (7) working spectral range: 486nm to 850 nm; (8) the total optical length TTL is less than or equal to 16mm, and the optical rear intercept is more than or equal to 4.2 mm; (9) the lens is suitable for a CCD or CMOS camera with high resolution and 200 ten thousand pixels;
in this embodiment, the aspherical surface has the following surface equation:
wherein z is a distance vector from a vertex of the aspheric surface when the aspheric surface is at a position with a height of R along the optical axis direction, c is a curvature of a paraxial of the aspheric surface, c =1/R, R is a curvature radius, c is a reciprocal of the curvature radius, k is a conic coefficient, a1 is an aspheric second-order coefficient, a2 is an aspheric fourth-order coefficient, a3 is an aspheric sixth-order coefficient, a4 is an aspheric eighth-order coefficient, a5 is an aspheric tenth-order coefficient, a6 is an aspheric twelfth-order coefficient, a7 is an aspheric fourteenth-order coefficient, a8 is an aspheric sixteenth-order coefficient, and the aspheric coefficients of the two aspheric lenses are as follows:
the invention provides another technical scheme that the working method of the day and night confocal wide-angle lens with small volume comprises the following steps: when light rays enter, the light path sequentially enters the front lens group A-0, the diaphragm B-0 and the rear lens group C-0 to be imaged, and when the light rays pass through the glass spherical meniscus negative lens A-1, the glass spherical meniscus negative lens A-1 mainly bears a larger field angle for negative focal power, so that the field angles born by the four rear lenses are compressed; when light passes through the glass spherical positive meniscus lens A-2, the glass spherical positive meniscus lens A-2 can better correct field curvature; when light passes through the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3, the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 can reasonably match with the refractive index and the Abbe number of plastic, so that chromatic aberration and high-level aberration of the system can be well corrected.
In this embodiment, it can be seen from fig. 2 that the lens meets the imaging requirement of 200 ten thousand pixels, and it can be seen from fig. 3 that the lens still has good imaging performance under the night vision 850nm condition.
The above-mentioned operation flow and software and hardware configuration are only used as the preferred embodiment of the present invention, and not to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or directly or indirectly applied to the related art, are included in the scope of the present invention.
Claims (5)
1. The utility model provides a confocal wide-angle lens of small, day night which characterized in that: the optical lens comprises a front lens group A-0, a diaphragm B-0 and a rear lens group C-0 which are sequentially arranged from left to right along an object space to an image space, wherein the front lens group A-0 comprises a glass spherical meniscus negative lens A-1 and a glass spherical meniscus positive lens A-2 which are sequentially arranged; the rear lens group C-0 comprises a plastic aspheric biconvex positive lens C-1, a plastic aspheric biconcave negative lens C-2 and a plastic aspheric biconvex positive lens C-3 which are sequentially arranged, and the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 form a combined sheet; setting the focal length of the lens as f; the focal lengths of the lenses from the object plane to the image plane are f1, f2, f3, f4 and f5 in sequence, and the following relations are satisfied: -1.6< f1/f < -1.2; -26< f2/f1< -22; 0.01< f3/f2< 0.05; -1< f4/f3< -0.5; -1< f5/f4< -1.5.
2. The small, day-night confocal wide-angle lens of claim 1, wherein: the air space between the glass spherical meniscus negative lens A-1 and the glass spherical meniscus positive lens A-2 is 2.17mm, the air space between the glass spherical meniscus positive lens A-2 and the diaphragm B-0 is 0.1mm, the air space between the diaphragm B-0 and the plastic aspheric double convex positive lens C-1 is 1.44mm, and the air space between the plastic aspheric double convex positive lens C-1 and the plastic aspheric double concave negative lens C-2 is 1.15mm from left to right along the object space to the image space.
3. The small, day-night confocal wide-angle lens of claim 2, wherein: the abbe numbers of the materials of the plastic aspheric double-concave negative lens C-2 and the plastic aspheric double-convex positive lens C-3 are respectively v4 and v5, and the refractive indexes are respectively n4 and n5, so that the following relations are satisfied: 20< v4< 30; 50< v5< 60; 1.6< n4< 1.7; 1.5< n5< 1.6.
4. A small, day and night confocal wide-angle lens according to claim 3, wherein: and a parallel flat plate and an IMA image surface are sequentially arranged at the rear end of the plastic aspheric double-convex positive lens C-3.
5. A method of operating a small-sized, day-night confocal wide-angle lens, comprising the small-sized, day-night confocal wide-angle lens according to claim 4, wherein: when light rays enter, the light path sequentially enters the front lens group A-0, the diaphragm B-0 and the rear lens group C-0 to be imaged, and when the light rays pass through the glass spherical meniscus negative lens A-1, the glass spherical meniscus negative lens A-1 mainly bears a larger field angle for negative focal power, so that the field angles born by the four rear lenses are compressed; when light passes through the glass spherical positive meniscus lens A-2, the glass spherical positive meniscus lens A-2 can better correct field curvature; when light passes through the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3, the plastic aspheric biconcave negative lens C-2 and the plastic aspheric biconvex positive lens C-3 can reasonably match with the refractive index and the Abbe number of plastic, so that chromatic aberration and high-level aberration of the system can be well corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305381.3A CN110989147B (en) | 2019-12-18 | 2019-12-18 | Small-size day-night confocal wide-angle lens and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911305381.3A CN110989147B (en) | 2019-12-18 | 2019-12-18 | Small-size day-night confocal wide-angle lens and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110989147A CN110989147A (en) | 2020-04-10 |
| CN110989147B true CN110989147B (en) | 2021-12-28 |
Family
ID=70094994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911305381.3A Active CN110989147B (en) | 2019-12-18 | 2019-12-18 | Small-size day-night confocal wide-angle lens and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110989147B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929867A (en) * | 2020-08-03 | 2020-11-13 | 凤凰光学股份有限公司 | Day and night high-low temperature confocal optical lens |
| CN113552699A (en) * | 2021-07-27 | 2021-10-26 | 福建福光天瞳光学有限公司 | 3mm large-aperture day and night confocal lens and imaging method thereof |
| CN114236776B (en) * | 2022-01-26 | 2023-11-28 | 福建福光天瞳光学有限公司 | Glass-plastic mixed starlight level 8mm day and night monitoring lens and imaging method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007333966A (en) * | 2006-06-14 | 2007-12-27 | Sony Corp | Imaging lens and imaging apparatus |
| CN101587232B (en) * | 2009-06-09 | 2012-01-11 | 宁波舜宇车载光学技术有限公司 | New megapixels wide-angle lens |
| DE102010035034B3 (en) * | 2010-08-20 | 2012-02-16 | Jos. Schneider Optische Werke Gmbh | High open wide angle lens |
| CN107102423B (en) * | 2017-05-26 | 2023-06-16 | 东莞市宇瞳光学科技股份有限公司 | Miniature high-definition ultra-wide angle prime lens |
| CN108646387B (en) * | 2018-06-26 | 2024-06-04 | 江西联创电子有限公司 | Day and night monitoring lens |
| CN109188654B (en) * | 2018-10-30 | 2024-08-23 | 舜宇光学(中山)有限公司 | Wide-angle lens |
-
2019
- 2019-12-18 CN CN201911305381.3A patent/CN110989147B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110989147A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208752293U (en) | Pick-up lens | |
| CN107193114B (en) | Short-focus ultra-wide-angle small fixed focus lens | |
| CN110646919B (en) | Fisheye lens | |
| CN110989147B (en) | Small-size day-night confocal wide-angle lens and working method thereof | |
| CN108351494B (en) | Imaging lens | |
| CN113589505B (en) | Zoom lens and imaging device | |
| CN111323895A (en) | Lens and manufacturing method thereof | |
| CN112526711A (en) | Optical system | |
| CN215375920U (en) | Camera lens | |
| CN205067852U (en) | Zoom lens | |
| CN111538148B (en) | Small-magnification camera and small-magnification zoom lens | |
| CN211014817U (en) | Zoom lens | |
| CN110441890B (en) | Glass-plastic mixed wide-angle lens | |
| CN217767016U (en) | Zoom lens | |
| CN218413029U (en) | Large-aperture large-target-surface long-focus optical lens | |
| CN217879799U (en) | Zoom lens | |
| CN218158534U (en) | Zoom lens | |
| CN115236843B (en) | Zoom lens | |
| CN100538423C (en) | Minisize image acquisition lens | |
| CN112987232A (en) | Optical lens and electronic device | |
| CN114578527B (en) | Super wide angle lens | |
| CN110333591A (en) | A kind of 0.95mm vehicle-mounted high-definition looks around optical system and its imaging method | |
| CN111679414B (en) | Super-wide-angle athermal day and night lens and working method thereof | |
| CN115494627A (en) | Fixed focus lens | |
| CN212321968U (en) | Large-image-plane high-resolution fisheye lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |