CN112612113B - Day and night confocal lens with large aperture of 3.9mm and imaging method thereof - Google Patents
Day and night confocal lens with large aperture of 3.9mm and imaging method thereof Download PDFInfo
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- CN112612113B CN112612113B CN202011593783.0A CN202011593783A CN112612113B CN 112612113 B CN112612113 B CN 112612113B CN 202011593783 A CN202011593783 A CN 202011593783A CN 112612113 B CN112612113 B CN 112612113B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 19
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000010226 confocal imaging Methods 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
-
- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- 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
Abstract
The invention relates to a 3.9mm large aperture day-night confocal lens and an imaging method thereof, wherein the imaging method comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens which are sequentially arranged from left to right along the incidence direction of light rays, the first lens is a biconcave negative lens, the second lens is a meniscus positive lens, the third lens is a biconvex positive lens, the fourth lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, and the first lens, the second lens, the fourth lens and the fifth lens are all aspheric lenses. During imaging, light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the protective glass from left to right and then are imaged. The invention has the characteristics of simple structure, low cost, stable imaging, small chromatic aberration and high overall reliability, realizes the function of day and night dual-purpose, and is suitable for 4K pixel CCD or CMOS cameras.
Description
Technical field:
the invention relates to a day and night confocal lens with a large aperture of 3.9mm and an imaging method thereof.
The background technology is as follows:
the modern society has higher and higher requirements on security protection, the security protection optical lens also develops from standard definition to high definition, and develops from single visible light imaging to visible light and infrared confocal imaging, and a megapixel and day and night dual-purpose zoom security protection lens becomes the main requirement of future markets. Common day and night dual-purpose lenses achieve the confocal purpose by switching optical filters with different thicknesses, and the imaging quality is not ideal enough and can not meet the 4K pixel shooting requirement.
The invention comprises the following steps:
the invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide a day and night confocal lens with a large aperture of 3.9mm and an imaging method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a 3.9mm large aperture day night confocal lens, includes along light incident direction from left to right setting gradually first lens, second lens, diaphragm, third lens, fourth lens and fifth lens, first lens is biconcave negative lens, and the second lens is meniscus positive lens, and the third lens is biconvex positive lens, and the fourth lens is meniscus negative lens, and the fifth lens is biconvex positive lens, and first lens, second lens, fourth lens and fifth lens are aspheric lens.
Further, the air interval between the first lens and the second lens is 1.3-1.6 mm, the air interval between the second lens and the diaphragm is 0.9-1.1 mm, the air interval between the diaphragm and the third lens is 0-1 mm, the air interval between the third lens and the fourth lens is 0-1 mm, and the air interval between the fourth lens and the fifth lens is 0-1 mm.
Further, the focal length of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are f respectively 1 、f 2 、f 3 、f 4 ，f 5 Wherein f 1 、f 2 、f 3 、f 4 、f 5 The following ratio is satisfied with f: -1.44<f 1 /f<-1.38，4.42<f 2 /f<4.58.，1.97<f 3 /f<2.11，-1.37<f 4 /f<-1.32，0.85<f 5 /f<1.01。
Further, the first lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; the second lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the third lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; the fourth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the fifth lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; wherein N is d Is of refractive index, V d Is an abbe constant.
Further, the total optical length TTL of the lens and the focal length F of the lens satisfy: TTL/F is less than or equal to 12.
Further, a protective glass is arranged on the rear side of the fifth lens.
Further, the first lens, the second lens, the fourth lens and the fifth lens are all made of resin materials.
The invention adopts another technical scheme that: the imaging method of the day and night confocal lens with the large aperture of 3.9mm comprises the steps of imaging light rays sequentially passing through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the protective glass from left to right.
Compared with the prior art, the invention has the following effects: the invention has the characteristics of simple structure, low cost, stable imaging, small chromatic aberration and high overall reliability, realizes the function of day and night dual-purpose, and is suitable for 4K pixel CCD or CMOS cameras.
Description of the drawings:
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a graph of the visible MTF of an embodiment of the present invention;
FIG. 3 is a graph of axial chromatic aberration for an embodiment of the invention;
fig. 4 is a field curvature/distortion diagram of 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-fifth lens; 6-diaphragm; 7-protecting glass; 8-imaging plane.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 4, the 3.9mm large aperture day-night confocal lens comprises a first lens L1, a second lens L2, a diaphragm 6, a third lens L3, a fourth lens L4 and a fifth lens L5 which are sequentially arranged from left to right along the light incidence direction, wherein the first lens L1 is a biconcave negative lens, the second lens L2 is a meniscus positive lens, the third lens L3 is a biconvex positive lens, the fourth lens L4 is a meniscus negative lens, the fifth lens L5 is a biconvex positive lens, and the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are all aspheric lenses, and the third lens L3 is a spherical lens.
In this embodiment, the air space between the first lens L1 and the second lens L2 is 1.3-1.6 mm, the air space between the second lens L2 and the diaphragm 6 is 0.9-1.1 mm, the air space between the diaphragm 6 and the third lens L3 is 0-1 mm, the air space between the third lens L3 and the fourth lens L4 is 0-1 mm, and the air space between the fourth lens L4 and the fifth lens L5 is 0-1 mm.
In this embodiment, both the object side surface and the image side surface of the first lens element L1 are concave surfaces; the object side surface of the second lens L2 is a concave surface, and the image side surface is a convex surface; the object side surface and the image side surface of the third lens L3 are both convex surfaces; the object side surface of the fourth lens element L4 is a convex surface, and the image side surface thereof is a concave surface; the object side surface and the image side surface of the fifth lens element L5 are convex.
In this embodiment, the focal length of the lens isf, focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are respectively f 1 、f 2 、f 3 、f 4 ，f 5 Wherein f 1 、f 2 、f 3 、f 4 、f 5 The following ratio is satisfied with f: -1.44<f 1 /f<-1.38，4.42<f 2 /f<4.58.，1.97<f 3 /f<2.11，-1.37<f 4 /f<-1.32，0.85<f 5 /f<1.01。
In this embodiment, the first lens L1 satisfies the relationship: n (N) d ≥1.5，V d More than or equal to 50; the second lens L2 satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the third lens L3 satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; the fourth lens L4 satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the fifth lens L5 satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; wherein N is d Is of refractive index, V d Is an abbe constant.
In this embodiment, the total optical length TTL of the lens and the focal length F of the lens satisfy: TTL/F is less than or equal to 12.
In this embodiment, a protective glass is disposed on the rear side of the fifth lens L5.
In this embodiment, the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are made of resin materials.
In this embodiment, when the lens is imaged, light is imaged on the imaging surface after passing through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the cover glass plate in order from left to right.
Table 1 shows the radius of curvature R, thickness d, and refractive index N of each lens of the optical system in the present embodiment d Abbe number V d 。
Table 1: specific lens parameter table
In this embodiment, each aspherical surface profile Z is defined by the following formula:
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, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic constant; A. b, C, D, E, F, G are all high order coefficients. Table 2 shows the conic constant k and the higher order coefficient A, B, C, D, E, F, G that can be used for each aspherical lens surface in this embodiment.
Table 2: parameters of each aspherical lens
In this embodiment, the technical indexes of the implementation of the optical system are as follows:
(1) Focal length: effl=3.97 mm; (2) aperture f=1.62; (3) angle of view: 2w is more than or equal to 100 degrees; (4) |optical distortion|: less than 40%; (5) the imaging circle diameter is greater than phi 7; (6) operating band: 420-840 nm; (7) The total optical length TTL is less than or equal to 19mm, and the optical back intercept BFL is more than or equal to 3mm; (8) the lens is suitable for a 4K pixel CCD or CMOS camera.
As can be seen from fig. 2, the MTF of the optical system in the visible light band is good, the MTF value of the edge view field is greater than 0.45 at the spatial frequency of 120pl/mm, the MTF value of the center view field is greater than 0.7 at the spatial frequency of 125pl/mm, and the 4K resolution power requirement can be achieved. Fig. 3 and 4 are graphs of axial chromatic aberration and chromatic dispersion focal shift of the optical system. As can be seen from fig. 3, the blue light of 420nm wave band is also included in the evaluation system, so that the chromatic aberration of the purple fringing is better corrected, and the purpose of improving the image quality is achieved. As can be seen from FIG. 4, the dispersion focal shift is less than 0.032mm in the 420-840 nm band. In conclusion, the optical system has excellent imaging quality and completely meets the 4K pixel shooting requirement.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching 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 embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (6)
1. A3.9 mm large aperture day night confocal lens is characterized in that: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens which are sequentially arranged from left to right along the incidence direction of light rays, wherein the first lens is a biconcave negative lens, the second lens is a meniscus positive lens, the third lens is a biconvex positive lens, the fourth lens is a meniscus negative lens, the fifth lens is a biconvex positive lens, and the first lens, the second lens, the fourth lens and the fifth lens are all aspheric lenses; in the lensThe optical element with optical power is a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the air interval between the first lens and the second lens is 1.3-1.6 mm, the air interval between the second lens and the diaphragm is 0.9-1.1 mm, the air interval between the diaphragm and the third lens is 0-1 mm, the air interval between the third lens and the fourth lens is 0-1 mm, and the air interval between the fourth lens and the fifth lens is 0-1 mm; the focal length of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively f 1 、f 2 、f 3 、f 4 ，f 5 Wherein f 1 、f 2 、f 3 、f 4 、f 5 The following ratio is satisfied with f: -1.44<f 1 /f<-1.38，4.42<f 2 /f<4.58.，1.97<f 3 /f<2.11，-1.37<f 4 /f<-1.32，0.85<f 5 /f<1.01。
2. A 3.9mm large aperture day and night confocal lens according to claim 1, wherein: the first lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; the second lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the third lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; the fourth lens satisfies the relation: n (N) d ≥1.5，V d Less than or equal to 50; the fifth lens satisfies the relation: n (N) d ≥1.5，V d More than or equal to 50; wherein N is d Is of refractive index, V d Is an abbe constant.
3. A 3.9mm large aperture day and night confocal lens according to claim 1, wherein: the total optical length TTL of the lens and the focal length F of the lens satisfy: TTL/F is less than or equal to 12.
4. A 3.9mm large aperture day and night confocal lens according to claim 1, wherein: and the rear side of the fifth lens is provided with a protective glass.
5. A 3.9mm large aperture day and night confocal lens according to claim 1, wherein: the first lens, the second lens, the fourth lens and the fifth lens are all made of resin materials.
6. An imaging method of a day and night confocal lens with a large aperture of 3.9mm is characterized by comprising the following steps: a 3.9mm large aperture day and night confocal lens according to any one of claims 1-5, wherein the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the protective glass from left to right for imaging.
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| CN112612113B true CN112612113B (en) | 2023-09-19 |
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| CN113376811A (en) * | 2021-06-30 | 2021-09-10 | 福建福光股份有限公司 | 2.8mm large-aperture day and night dual-purpose glass-plastic fixed-focus optical system |
| CN114355560B (en) * | 2021-12-29 | 2024-03-15 | 福建福光股份有限公司 | High-definition optical lens |
| CN114879341B (en) * | 2022-03-17 | 2024-01-12 | 福建福光天瞳光学有限公司 | Day and night shared monitoring system with simple structure and working method thereof |
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