CN107765399B - 6mm large-light-transmission day and night confocal high-definition lens - Google Patents
6mm large-light-transmission day and night confocal high-definition lens Download PDFInfo
- Publication number
- CN107765399B CN107765399B CN201711109824.2A CN201711109824A CN107765399B CN 107765399 B CN107765399 B CN 107765399B CN 201711109824 A CN201711109824 A CN 201711109824A CN 107765399 B CN107765399 B CN 107765399B
- Authority
- CN
- China
- Prior art keywords
- lens
- group
- biconvex
- concave lens
- concave
- 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
- G02B13/0055—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
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a 6mm large-light-passing day and night confocal high-definition lens, which comprises a lens barrel, wherein a front group A, a diaphragm and a rear group B are sequentially arranged in the lens barrel along the incident direction of light rays from left to right, the front group A comprises a concave lens A-1, a biconvex lens A-2 and a concave lens A-3 which are sequentially arranged, the rear group B comprises a biconvex lens B-1, a biconvex lens B-2 and a concave lens B-3 which are sequentially arranged, the biconvex lens B-2 and the concave lens B-3 form a gluing group, the air interval between the front group A and the rear group B is 1.1mm, the air interval between the concave lens A-1 and the biconvex lens A-2 is 1mm, the air interval between the biconvex lens A-2 and the concave lens A-3 is 0.4mm, the air interval between the biconvex lens B-1 and the gluing group is 0.1mm, the lens can clearly image under the illumination environment in daytime and can also clearly image through infrared light supplement at night or under the lower illumination environment.
Description
Technical Field
The invention relates to a 6mm large-light-transmission day and night confocal high-definition lens.
Background
At present, various large-light-transmission fixed-focus lenses are applied to a security system in the market, but the problems of serious purple fringing, poor day and night confocal property and the like cannot be solved by a plurality of products, so that the imaging result is unsatisfactory, a larger number of lenses are required to be used to achieve a more perfect effect, and the product cost is greatly increased. At present, in the security industry, a large-light-transmission wide-angle and low-temperature drift fixed-focus lens with low cost and high image quality is provided in the true sense.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a 6mm large-light-transmission day-night confocal high-definition lens.
In order to solve the technical problems, the technical scheme of the invention is as follows: the large-light-passing day and night confocal high-definition lens comprises a lens barrel, wherein a front group A, a diaphragm and a rear group B are sequentially arranged in the lens barrel along the incident direction of light from left to right, the front group A comprises a concave lens A-1, a biconvex lens A-2 and a concave lens A-3 which are sequentially arranged, the rear group B comprises a biconvex lens B-1, a biconvex lens B-2 and a concave lens B-3 which are sequentially arranged, and the biconvex lens B-2 and the concave lens B-3 form a gluing group.
Further, the air space between the front group A and the rear group B is 1.1mm, the air space between the concave lens A-1 and the biconvex lens A-2 is 1mm, the air space between the biconvex lens A-2 and the concave lens A-3 is 0.4mm, and the air space between the biconvex lens B-1 and the bonding group is 0.1 mm.
Furthermore, the front group A has negative focal power, and the rear group B has positive focal power.
Further, a protective glass sheet is arranged on the rear side of the lens B-3.
Furthermore, an AB space ring is arranged between the concave lens A-1 and the biconvex lens A-2, a CD space ring is arranged between the concave lens A-3 and the biconvex lens B-1, and a DE space ring is arranged between the biconvex lens B-1 and the glue combination.
Compared with the prior art, the invention has the following beneficial effects: the structure is compact, aberration of the lens in a wavelength range of 480-850 nm is reasonably corrected and balanced, clear imaging can be achieved in a daytime illumination environment, and imaging can be achieved at night or in a lower illumination environment through infrared light supplement.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a mechanical structure of an optical lens according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 3 is the MTF for the best image quality of the central field of view of visible light when focused;
fig. 4 is the MTF for night vision with best image quality for the central field of view of visible light when focused.
In the figure:
1-AB space ring, 2-CD space ring, 3-DE space ring, 4-lens cone, 5-concave lens A-1; 6-biconvex lens A-2; 7-concave lens a-3; 8-biconvex lens B-1; 9-biconvex lens B-2; 10-concave lens B-3; 11-a diaphragm; 12-protective glass sheet.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-2, a 6mm large-light-transmission day and night confocal high-definition lens comprises a lens barrel, wherein a front group a, a diaphragm and a rear group B are sequentially arranged in the lens barrel along the incident direction of light from left to right, the front group a comprises a concave lens a-1, a biconvex lens a-2 and a concave lens a-3 which are sequentially arranged, the rear group B comprises a biconvex lens B-1, a biconvex lens B-2 and a concave lens B-3 which are sequentially arranged, and the biconvex lens B-2 and the concave lens B-3 form a cemented group.
In this embodiment, the air space between the front group a and the rear group B is 1.1mm, the air space between the concave lens a-1 and the lenticular lens a-2 is 1mm, the air space between the lenticular lens a-2 and the concave lens a-3 is 0.4mm, and the air space between the lenticular lens B-1 and the adhesive group is 0.1 mm.
In this embodiment, the front group a has negative power, and the rear group B has positive power, so as to achieve the purpose of front-rear compensation.
In this embodiment, the rear side of the lens B-3 is provided with a protective glass sheet.
In this embodiment, an AB spacer is disposed between the concave lens a-1 and the biconvex lens a-2, a CD spacer is disposed between the concave lens a-3 and the biconvex lens B-1, and a DE spacer is disposed between the biconvex lens B-1 and the glue set.
In this embodiment, the optical structure formed by the above lens assembly achieves the following optical indexes:
focal length: f' =6 mm;
relative pore size F = 1.2;
the field angle is more than or equal to 75 degrees (the image field angle is 2 η' ≧ phi 6.8 mm);
distortion: less than-20 percent;
resolution ratio: can be matched with a 300 ten thousand pixel high-resolution CCD or CMOS camera;
the total length ∑ of the light path is not more than 22mm, and the optical rear intercept L' is not less than 5 mm;
applicable spectral line range: 480 nm-850 nm.
In the embodiment, the whole lens ensures that the refractive index and the focal power of the lens are approximately proportionally distributed, and the balance of the incident angles of the front and rear lens groups is ensured, so that the sensitivity of the lens is reduced, and the production possibility is improved.
In the embodiment, the total length of the optical path is short and the volume of the lens is small, which can be known from technical indexes; the back focus is large, and the camera with various interfaces can be matched for use; the external structure of the lens adopts the plastic material lens cone, so that the lens is lighter; the front group of negative focal power and the rear group of positive focal power ensure normal use in high and low temperature environments; high-refraction low-dispersion flint glass and high-refraction high-dispersion crown glass are selected to be achromatic and astigmatic; the lens used in the invention is global, the assembly difficulty of the lens is low, the low-price glass is used, the processing and material cost is reduced, and the optical sensitivity of the lens is reduced.
In this embodiment, the design of the mechanical structure needs to satisfy the requirements of the production and assembly processes, the assembly size requirements of customers, and the coaxiality, effective clear aperture and air space between the lenses in the light path design.
AB space ring: the mechanical part is used for ensuring the air space and the optical axis assembly of the A-1 lens and the A-2 lens, intercepting and absorbing invalid light rays, and the problem of stray light of a lens can be effectively solved by adopting an extinction line type design in the space ring, so that an imaging picture is cleaner and clearer.
CD space ring: the mechanical piece has the main functions of ensuring the air space and the optical axis assembly of the A-3 lens and the B-1 lens, intercepting and absorbing invalid light rays, effectively solving the problem of stray light of the lens by adopting an extinction line type design in the space ring, and ensuring the clear aperture of the lens by controlling the size of an inner hole at the position of the diaphragm.
DE space ring: the mechanical piece has the main functions of ensuring the air space and the optical axis assembly of the B-1 lens and the B-2 lens, intercepting and absorbing invalid light rays, effectively solving the problem of stray light of the lens by adopting an extinction line type design in the space ring, and ensuring the clear aperture of the lens by controlling the size of an inner hole at the position of the diaphragm.
A lens barrel: the mechanical piece is used as a sleeve for bearing the lens and the space ring, is made of special plastic materials, is directly injection-molded through a mold, and has the advantages of high dimensional precision, good batch consistency and stability, high molding efficiency, light weight and the like. Besides the inner diameters of all steps in the lens barrel need to be processed strictly according to the drawing tolerance, the coaxiality between all steps is also an important factor for ensuring the imaging quality, namely, the plane where the spacer ring is contacted with the lens needs to have accurate perpendicularity and coaxiality to ensure the accuracy of lens assembly, so that the spacer ring is tightly matched with the lens, and the consistency of the optical axis of the lens is ensured. The lens cone adopts a high-temperature fusion process to fix the whole group of lenses and the space ring together, ensures the imaging quality and has certain waterproof and anti-vibration effects. The lens barrel also adopts an M12X0.5-4h interface mode to match the use requirements of a client camera.
The specific parameters of each lens are as follows:
fig. 3 and 4 are the MTF for the best image quality of the central field of view of visible light when focused and the MTF for night vision, respectively. As can be seen from fig. 3 and 4, when visible light is imaged, the pair position of 120 lines in the central field of view is close to 0.6, the pair position of 120 lines in the edge field of view is close to 0.4, the MTF curve is decreased slowly, the imaging has good contrast and resolution, and the MTF difference between different fields of view is small; the infrared imaging adopts 0.85 micron wavelength, under the condition of clear visible light imaging, the MTF at the 120 line pair position of the central view field is greater than 0.2, the standard is reached, optical filters with different thicknesses do not need to be switched, and day and night confocal is really realized.
The lens barrel is light in overall structure, meets the principle of small overall size, all the space rings are machined by adopting precise numerical control machining equipment for matching precision, and the main lens barrel is formed by adopting a mold in an injection molding mode, so that the matching precision and stability of various mechanical parts and lenses are ensured.
The lens has good visible light imaging performance and can realize day and night confocal without switching optical filters with different thicknesses. Under the condition of ensuring the performance of excellent imaging quality, small temperature drift, day and night confocal performance and the like, the lower cost is realized, and the advantages of smaller volume, lighter weight and more simplified structure are simultaneously met. The ultra-low cost high-definition camera shooting level is realized, high-quality pixels can be achieved in the daytime, high-definition image quality is achieved under the night condition, and imaging quality can be guaranteed under the severe environment of extreme temperature.
The lens has the advantages of large field angle, dual purposes of day and night, simple optical structure, economic material price and the like, the resolution can reach 3MP, and the lens can be matched with a corresponding CCD or CMOS.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (1)
1. The utility model provides a confocal high definition camera lens of big light-passing day night of 6mm which characterized in that: the lens comprises a lens cone, a front group A, a diaphragm and a rear group B are sequentially arranged in the lens cone along the incident direction of light rays from left to right, the front group A comprises a concave lens A-1, a biconvex lens A-2 and a concave lens A-3 which are sequentially arranged, the rear group B comprises a biconvex lens B-1, a biconvex lens B-2 and a concave lens B-3 which are sequentially arranged, the air interval between the front group A and the rear group B is 1.1mm, the air interval between the concave lens A-1 and the biconvex lens A-2 is 1mm, the air interval between the biconvex lens A-2 and the concave lens A-3 is 0.4mm, the air interval between the biconvex lens B-1 and the glue group is 0.1mm, the curvature radiuses of the object side face and the image side face of the concave lens A-1 are respectively-15.5 mm, and the curvature radiuses of the image side face of the concave lens A-1, the concave lens A-, 4.5mm, thickness 0.7 mm; the curvature radii of the object side surface and the image side surface of the biconvex lens A-2 are respectively 9.3mm and-13 mm, and the thickness is 4 mm; the curvature radii of the object side surface and the image side surface of the concave lens A-3 are respectively-6.1 mm and 6.1mm, and the thickness is 1 mm; the curvature radii of the object side surface and the image side surface of the biconvex lens B-1 are respectively 12mm and-5.2 mm, and the thickness is 2.8 mm; the curvature radii of the object side surface and the image side surface of the biconvex lens B-2 are respectively 9.5mm and-10 mm, and the thickness is 1.3 mm; the curvature radiuses of the object side surface and the image side surface of the concave lens B-3 are respectively-10 mm and-50 mm, the thickness is 2.6mm, the front group A is negative focal power, the rear group B is positive focal power, a protective glass sheet is arranged on the rear side of the lens B-3, an AB space ring is arranged between the concave lens A-1 and the double-convex lens A-2, a CD space ring is arranged between the concave lens A-3 and the double-convex lens B-1, and a DE space ring is arranged between the double-convex lens B-1 and the glue group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711109824.2A CN107765399B (en) | 2017-11-11 | 2017-11-11 | 6mm large-light-transmission day and night confocal high-definition lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711109824.2A CN107765399B (en) | 2017-11-11 | 2017-11-11 | 6mm large-light-transmission day and night confocal high-definition lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107765399A CN107765399A (en) | 2018-03-06 |
| CN107765399B true CN107765399B (en) | 2020-07-17 |
Family
ID=61272856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711109824.2A Active CN107765399B (en) | 2017-11-11 | 2017-11-11 | 6mm large-light-transmission day and night confocal high-definition lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107765399B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0882769A (en) * | 1994-09-14 | 1996-03-26 | Minolta Co Ltd | Zoom lens having function to correct hand shake |
| JPH1090600A (en) * | 1996-09-12 | 1998-04-10 | Nikon Corp | Variable magnification optical system |
| US6844987B2 (en) * | 2002-09-11 | 2005-01-18 | Fuji Photo Film Co., Ltd. | Zoom lens system for covering superwide-angle area |
| CN105425365A (en) * | 2015-12-25 | 2016-03-23 | 福建福光股份有限公司 | 6mm high-light-transmission prime lens |
| CN106371194A (en) * | 2016-11-23 | 2017-02-01 | 福建福光股份有限公司 | 6mm high-light-flux and high-definition prime lens for day and night use |
-
2017
- 2017-11-11 CN CN201711109824.2A patent/CN107765399B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0882769A (en) * | 1994-09-14 | 1996-03-26 | Minolta Co Ltd | Zoom lens having function to correct hand shake |
| JPH1090600A (en) * | 1996-09-12 | 1998-04-10 | Nikon Corp | Variable magnification optical system |
| US6844987B2 (en) * | 2002-09-11 | 2005-01-18 | Fuji Photo Film Co., Ltd. | Zoom lens system for covering superwide-angle area |
| CN105425365A (en) * | 2015-12-25 | 2016-03-23 | 福建福光股份有限公司 | 6mm high-light-transmission prime lens |
| CN106371194A (en) * | 2016-11-23 | 2017-02-01 | 福建福光股份有限公司 | 6mm high-light-flux and high-definition prime lens for day and night use |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107765399A (en) | 2018-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108020909B (en) | 2.8mm focal length high definition super wide angle vehicle-mounted lens | |
| CN103439782B (en) | 2.8 focus bugeye lens | |
| CN107422463B (en) | Confocal optical system of clear day night of long burnt superelevation | |
| CN109459838B (en) | Wide-angle high-resolution vehicle-mounted optical system and imaging method | |
| CN109324400B (en) | Compact-structure 2-time high-definition zoom glass-plastic lens 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 | |
| CN110109232B (en) | Zoom lens and imaging method thereof | |
| CN109633863B (en) | Vehicle-mounted front-view high-definition lens with focal length of 5.47mm and imaging method thereof | |
| CN109375343B (en) | Vehicle-mounted high-definition looking-around optical system with size of 1.1mm and imaging method thereof | |
| CN110703417A (en) | All-plastic aspheric day and night confocal optical system | |
| CN209198754U (en) | A kind of high definition is taken photo by plane camera lens | |
| CN107765399B (en) | 6mm large-light-transmission day and night confocal high-definition lens | |
| CN104238077A (en) | Linear dispersion objective lens | |
| CN113376811B (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 | |
| CN107436483B (en) | 1.7mm ultra-wide-angle rear-view vehicle-mounted lens | |
| CN215867313U (en) | 2.8mm large-aperture day and night dual-purpose glass-plastic fixed-focus optical system | |
| CN108169875A (en) | A kind of big thang-kng of 2.8mm day and night confocal high definition camera lens | |
| CN205643814U (en) | High resolution , dual -purpose tight shot of low distortion day night | |
| CN109358407B (en) | 3.8mm super-economical low-sensitivity high-order aspheric optical system and imaging method thereof | |
| CN203422519U (en) | Ultra-wide-angle 2.8 primary lens | |
| CN103389565B (en) | Low-distortion and high-resolution infrared miniature lens | |
| CN105259637A (en) | Large-target face day and night confocal high-definition fixed-focus lens | |
| CN110412744A (en) | A kind of novel rearview optical system and its manufacturing method |
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 |