CN109358407B - 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof - Google Patents
3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof Download PDFInfo
- Publication number
- CN109358407B CN109358407B CN201811363561.2A CN201811363561A CN109358407B CN 109358407 B CN109358407 B CN 109358407B CN 201811363561 A CN201811363561 A CN 201811363561A CN 109358407 B CN109358407 B CN 109358407B
- Authority
- CN
- China
- Prior art keywords
- lens
- aspheric
- aspheric lens
- optical system
- super
- 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
- G02B13/001—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
- G02B13/0035—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 three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a 3.8mm super-economical low-sensitivity high-order aspheric optical system, wherein the optical system of a lens is sequentially provided with a first aspheric lens A-1, a biconvex lens A-2, a diaphragm D, a second aspheric lens B-1 and a third aspheric lens B-2 along the incidence direction of light rays from left to right; the first aspheric lens A-1 and the biconvex lens A-2 form a front group lens with positive focal power, and the second aspheric lens B-1 and the third aspheric lens B-2 form a rear group lens with positive focal power. High resolution, zero temperature drift, day-night confocal and super economy are realized, and the device can be matched with CCD or CMOS below 600 ten thousand.
Description
Technical Field
The invention relates to a 3.8mm super-economical low-sensitivity high-order aspheric optical system and an imaging method thereof.
Background
Various 3.8mm fixed focus lenses are applied to security systems in the prior market, but the lens designed by glass is difficult to meet the market demands in terms of pixels and performances. In order to improve the performance and pixels, more glass lenses are used to achieve higher definition image quality, so that the product cost is greatly increased, and the product popularization difficulty is improved. At present, in the security industry, the lens has the advantages of low cost, high image quality and low-temperature drift and fixed focus in a real sense.
Disclosure of Invention
The invention aims at overcoming the defects, and provides a 3.8mm super-economical low-sensitivity high-order aspheric optical system with a simple structure and an imaging method thereof.
The technical scheme of the invention is that a 3.8mm super-economical low-sensitivity high-order aspheric optical system is provided with a first aspheric lens A-1, a biconvex lens A-2, a diaphragm D, a second aspheric lens B-1 and a third aspheric lens B-2 in sequence along the incidence direction of light rays from left to right; the first aspheric lens A-1 and the biconvex lens A-2 form a front group lens with positive focal power, and the second aspheric lens B-1 and the third aspheric lens B-2 form a rear group lens with positive focal power.
Further, the focal length of the optical system is f, and the first aspheric lens A-1,The focal lengths of the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 are f1, f2, f3 and f4 respectively, wherein f1, f2, f3, f4 and f meet the following proportion:
further, f3 and f4 must satisfy:
further, a filter C is further disposed at the rear side of the third aspheric lens B-2.
Further, the first aspheric lens A-1, the second aspheric lens B-1 and the third aspheric lens B-2 are all made of plastic materials.
Further, the air space between the first aspheric lens A-1 and the biconvex lens A-2 is 5.06mm, the air space between the biconvex lens A-2 and the diaphragm D is 0.1mm, the air space between the diaphragm D and the second aspheric lens B-1 is 2.55mm, and the air space between the second aspheric lens B-1 and the third aspheric lens B-2 is 0.11mm.
An imaging method of a 3.8mm super-economical low-sensitivity high-order aspheric optical system is carried out according to the following steps: the light rays sequentially pass through the first aspheric lens A-1, the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 from left to right and then are imaged.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the spherical aberration and chromatic aberration are corrected by separating the front group of the aspheric surfaces from the rear group of the aspheric surfaces, the high-grade aberration is compensated by the two aspheric air gaps, and the focal point of each aspheric surface is reasonably calculated so as to be free from offset in a high-temperature and low-temperature environment, and the effect of day and night focusing is achieved; the invention has fewer structural lenses, realizes high-definition shooting level with ultra-low cost, not only can reach high-quality pixels in daytime, but also has high-definition image quality under the condition of insufficient light or night, and can still form perfect images in severe environments with different temperatures.
Drawings
The patent of the invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an optical system of the present invention;
FIG. 2 is a graph of MTF focused such that the visible center field of view image quality is optimal;
fig. 3 is a night vision MTF plot focused such that the visible center field of view image quality is optimal.
In the figure: the lens comprises a first aspheric lens A-1, a biconvex lens A-2, a second aspheric lens B-1, a third aspheric lens B-2, a diaphragm D and a filter C.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1-3, a 3.8mm super-economical low-sensitivity high-order aspheric optical system is provided, wherein the optical system of the lens is sequentially provided with a first aspheric lens A-1, a biconvex lens A-2, a diaphragm D, a second aspheric lens B-1 and a third aspheric lens B-2 along the incidence direction of light rays from left to right; the first aspheric lens A-1 and the biconvex lens A-2 form a front group lens with positive focal power, and the second aspheric lens B-1 and the third aspheric lens B-2 form a rear group lens with positive focal power.
In this embodiment, the focal length of the optical system is f, the focal lengths of the first aspheric lens A-1, the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 are f1, f2, f3 and f4 respectively, wherein f1, f2, f3, f4 and f satisfy the following ratio:
by reasonably distributing the focal power of the lens according to the proportion, each lens is in a certain proportion relative to the focal length f of the system, so that the aberration of the lens in the wavelength range of 420-850 nm is reasonably corrected and balanced.
In the present embodimentIn (3), f3 and f4 must satisfy:
the lens can clearly image at high temperature and low temperature, so that the temperature drift is zero, high-definition imaging can be realized under severe temperature conditions, defocus is avoided, and the focal power ratio of the two aspheric surfaces of the rear group must meet the conditions.
In this embodiment, a filter C is further disposed at the rear side of the third aspheric lens B-2.
In this embodiment, the first aspheric lens A-1, the second aspheric lens B-1 and the third aspheric lens B-2 are made of plastic materials.
In this embodiment, the air space between the first aspheric lens A-1 and the biconvex lens A-2 is 5.06mm, the air space between the biconvex lens A-2 and the diaphragm D is 0.1mm, the air space between the diaphragm D and the second aspheric lens B-1 is 2.55mm, and the air space between the second aspheric lens B-1 and the third aspheric lens B-2 is 0.11mm.
An imaging method of a 3.8mm super-economical low-sensitivity high-order aspheric optical system is carried out according to the following steps: the light rays sequentially pass through the first aspheric lens A-1, the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 from left to right and then are imaged.
In this embodiment, the optical system composed of the lens groups described above achieves the following optical indexes:
focal length: f=3.8 mm;
relative aperture f=2.0;
angle of view: 2w is more than or equal to 110 degrees (the image field of view 2 eta' is more than or equal to phi 6.6 mm);
TV distortion: < -8%;
resolution ratio: can be matched with a 600 ten thousand-pixel high-resolution CCD or CMOS camera;
the total length sigma of the light path is less than or equal to 22mm, and the optical rear intercept L' is less than or equal to 5mm;
the applicable spectral line range: 420 nm-850 nm.
In this embodiment, the parameters of each lens are shown in the following table:
in this embodiment, the front group negative power corrects the rear group positive power aberration, and the front group one-piece aspherical surface and the rear group two-piece aspherical surface correct all the higher order aberrations. The whole lens ensures the approximate proportion distribution of the refractive index and the focal power of the lens, and ensures the balance of the incident angles of the front group of lenses and the rear group of lenses so as to reduce the sensitivity of the lens and improve the possibility of production. By reasonably distributing the focal length of each lens, the spherical aberration and the field curvature of the imaging system are small at the same time, and the image quality of the axial and off-axis visual fields is ensured. The total length of the optical path is shorter through the optical system formed by the lenses, so that the size of the lens is small; the back focus is large, and the camera with various interfaces can be matched for use. The first aspheric lens A-1, the second aspheric lens B-1 and the third aspheric lens B-2 are three plastic aspheric surfaces, so that the image quality is good, and the cost is low; the front group of lenses have negative focal power, and the rear group of lenses have positive focal power, so that the lens can still be normally used in a high-low temperature environment; the structure is simple, the volume is small, the high-definition shooting level is realized with ultralow cost, and the imaging can be completed in severe environments with different temperatures.
While the foregoing is directed to the preferred embodiment, other and further embodiments of the invention will be apparent to those skilled in the art from the following description, wherein the invention is described, by way of illustration and example only, and it is intended that the invention not be limited to the specific embodiments illustrated and described, but that the invention is to be limited to the specific embodiments illustrated and described.
Claims (6)
1. A 3.8mm super-economical low-sensitivity high-order aspheric optical system, which is characterized in that: the optical system of the lens sequentially comprises a first aspheric lens A-1, a biconvex lens A-2, a diaphragm D, a second aspheric lens B-1 and a third aspheric lens B-2 along the incidence direction of light rays from left to right; the first aspheric lens A-1 has negative focal power, the second aspheric lens B-1 has positive focal power, and the third aspheric lens B-2 has negative focal power; wherein the first aspherical lens A-1 and the biconvex lensA-2 forms a front group lens with positive focal power, and the second aspheric lens B-1 and the third aspheric lens B-2 form a rear group lens with positive focal power; the focal length of the optical system is f, the focal lengths of the first aspheric lens A-1, the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 are f1, f2, f3 and f4 respectively, wherein f1, f2, f3, f4 and f satisfy the following proportion:
2. the 3.8mm super-economical low-sensitivity high-order aspheric optical system according to claim 1, characterized in that: f3 and f4 must satisfy:
3. the 3.8mm super-economical low-sensitivity high-order aspheric optical system according to claim 1, characterized in that: and the rear side of the third aspheric lens B-2 is also provided with an optical filter C.
4. The 3.8mm super-economical low-sensitivity high-order aspheric optical system according to claim 1, characterized in that: the first aspheric lens A-1, the second aspheric lens B-1 and the third aspheric lens B-2 are all made of plastic materials.
5. The 3.8mm super-economical low-sensitivity high-order aspheric optical system according to claim 1, characterized in that: the air interval between the first aspheric lens A-1 and the biconvex lens A-2 is 5.06mm, the air interval between the biconvex lens A-2 and the diaphragm D is 0.1mm, the air interval between the diaphragm D and the second aspheric lens B-1 is 2.55mm, and the air interval between the second aspheric lens B-1 and the third aspheric lens B-2 is 0.11mm.
6. A method for imaging a 3.8mm supereconomical low-sensitivity high-order aspheric optical system, characterized in that the 3.8mm supereconomical low-sensitivity high-order aspheric optical system according to any one of claims 1-5 is adopted and carried out as follows: the light rays sequentially pass through the first aspheric lens A-1, the biconvex lens A-2, the second aspheric lens B-1 and the third aspheric lens B-2 from left to right and then are imaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811363561.2A CN109358407B (en) | 2018-11-16 | 2018-11-16 | 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811363561.2A CN109358407B (en) | 2018-11-16 | 2018-11-16 | 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109358407A CN109358407A (en) | 2019-02-19 |
| CN109358407B true CN109358407B (en) | 2023-06-06 |
Family
ID=65345367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811363561.2A Active CN109358407B (en) | 2018-11-16 | 2018-11-16 | 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109358407B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703417A (en) * | 2019-11-13 | 2020-01-17 | 福建福光股份有限公司 | All-plastic aspheric day and night confocal optical system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566013B (en) * | 2010-12-15 | 2014-06-11 | 大立光电股份有限公司 | Optical photographing system |
| JP5804474B2 (en) * | 2011-10-28 | 2015-11-04 | 株式会社オプトロジック | Imaging lens |
| CN104834077B (en) * | 2015-05-28 | 2017-05-31 | 广东弘景光电科技股份有限公司 | Image pickup lens for image pickup device |
-
2018
- 2018-11-16 CN CN201811363561.2A patent/CN109358407B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109358407A (en) | 2019-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110568590A (en) | Starlight-level optical lens and imaging method thereof | |
| CN109324400B (en) | Compact-structure 2-time high-definition zoom glass-plastic lens and imaging method thereof | |
| CN106249384A (en) | A kind of super economical 3.6mm aspheric surface day and night confocal optical system | |
| CN109375343B (en) | Vehicle-mounted high-definition looking-around optical system with size of 1.1mm and imaging method thereof | |
| CN109324401B (en) | 3-time economic day and night confocal Gao Qingbo plastic zoom lens and imaging method thereof | |
| CN105259638A (en) | High-light through high-definition fixed-focus aspheric lens | |
| CN210742599U (en) | Starlight-level optical lens | |
| CN109358407B (en) | 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof | |
| CN110333591B (en) | 0.95mm vehicle-mounted high-definition looking-around optical system and imaging method thereof | |
| CN110806633A (en) | 1.4mm wide-angle optical system and imaging method thereof | |
| CN110346921A (en) | A kind of vehicle-mounted optical system of day and night and its imaging method | |
| CN215867313U (en) | 2.8mm large-aperture day and night dual-purpose glass-plastic fixed-focus optical system | |
| CN112363306B (en) | High-resolution large-target-surface 10-30mm day-night zoom monitoring lens and imaging method | |
| CN108319005A (en) | A kind of super clear 4K optical systems of the aspherical day and nights of 4mm | |
| CN113376811A (en) | 2.8mm large-aperture day and night dual-purpose glass-plastic fixed-focus optical system | |
| CN210514764U (en) | 2.82mm focus streaming media intelligence rear-view mirror head | |
| CN110703417A (en) | All-plastic aspheric day and night confocal optical system | |
| CN109298509B (en) | 3.9mm Gao Qingbo plastic pinhole lens and imaging method thereof | |
| CN209311767U (en) | The super economical low sensitivity order aspherical optical system of 3.8mm | |
| CN109188658B (en) | 25mm large target surface high definition 4K aspheric optical system and imaging method | |
| CN105259637A (en) | Large-target face day and night confocal high-definition fixed-focus lens | |
| CN110554488A (en) | small day and night dual-purpose vehicle-mounted optical system and working method thereof | |
| CN108983398B (en) | Economical 6mm aspheric surface optical system | |
| CN209070195U (en) | A kind of super economical big wide-angle low order aspheric optical system of 2.7mm | |
| CN110658608B (en) | 12mm large-aperture day and night dual-purpose prime 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 |