CN109946816B - Ultra-small near-infrared aspheric optical system and imaging method - Google Patents
Ultra-small near-infrared aspheric optical system and imaging method Download PDFInfo
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- CN109946816B CN109946816B CN201910311642.6A CN201910311642A CN109946816B CN 109946816 B CN109946816 B CN 109946816B CN 201910311642 A CN201910311642 A CN 201910311642A CN 109946816 B CN109946816 B CN 109946816B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 23
- 238000003384 imaging method Methods 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000004297 night vision Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The invention relates to a microminiature near infrared aspheric optical system, which comprises a first spherical lens A1, a diaphragm C, a second spherical lens B1, a first aspheric lens B2 and a second aspheric lens B3 which are sequentially arranged from an object side to an image side, wherein the first spherical lens A1 forms a front group A with negative focal power, and the second spherical lens B1, the first aspheric lens B2 and the second aspheric lens B3 form a rear group B with positive focal power; the invention also relates to an imaging method of the microminiature near infrared aspheric optical system. The invention has the advantages of simple and reasonable structural design, ultra-short light path design, extremely reduced installation space, miniaturization of the camera, concealment, larger light-transmitting aperture, good night vision imaging effect, clear imaging even if no illumination environment exists in the vehicle, good level of MTF imaging index by adopting a glass-plastic mixed design scheme, reasonable focal power distribution and material selection, and good imaging performance at high and low temperatures.
Description
Technical Field
The invention relates to a microminiature near infrared aspheric optical system and an imaging method.
Background
At present, various large vehicle-mounted factories and merchants are concentrated in researching fatigue driving early warning monitoring systems, the fatigue driving early warning monitoring systems capture face images of drivers through optical lenses, monitor fatigue conditions of the drivers in real time, early warn fatigue driving in time, and have great significance in safe driving and driving protection. Because the light environment in the vehicle is complex, the prior common vehicle-mounted lens has insufficient image definition at night, has more noise points and seriously affects the judgment and the identification of the early warning system. The optical lens designed for the near infrared 940nm wave band can still capture clear images under the condition of insufficient light at night. In addition, such a lens mounting position is directed against a human face, and a concealed, miniaturized structure is required.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the ultra-small near infrared aspheric optical system and the imaging method, which not only have reasonable structural design, but also have good imaging performance.
In order to solve the technical problems, the technical scheme of the invention is as follows: a microminiature near infrared aspheric optical system comprises a first spherical lens A1, a diaphragm C, a second spherical lens B1, a first aspheric lens B2 and a second aspheric lens B3 which are sequentially arranged from an object side to an image side, wherein the first spherical lens A1 forms a front group A with negative focal power, and the second spherical lens B1, the first aspheric lens B2 and the second aspheric lens B3 form a rear group B with positive focal power.
Further, the first spherical lens A1 is a biconcave lens A1, and the second spherical lens B1 is a biconvex lens B1.
Further, the air interval between the first spherical lens A1 and the second spherical lens B1 is 0.65mm; the air interval between the second spherical lens B1 and the first aspherical lens B2 is 0.7mm; the air interval between the first aspherical lens B2 and the second aspherical lens B3 is 0.3mm.
Further, the second spherical lens B1 satisfies the relationship: nd is more than or equal to 1.8, vd is more than or equal to 30; the first aspheric lens B2 satisfies the relation: nd is more than or equal to 1.6, vd is less than or equal to 30; the second aspherical lens B3 satisfies the relation: nd is more than or equal to 1.5, vd is more than or equal to 50, wherein Nd is refractive index, and Vd is Abbe constant.
An imaging method of a subminiature near infrared aspheric optical system, comprising any one of the subminiature near infrared aspheric optical systems described above, comprising the steps of: the light rays sequentially pass through the first spherical lens A1, the diaphragm C, the second spherical lens B1, the first aspherical lens B2 and the second aspherical lens B3 to be imaged.
Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of simple and reasonable structural design, ultra-short light path design, extremely reduced installation space, miniaturization of the camera, concealment, larger light-transmitting aperture, good night vision imaging effect, clear imaging even if no illumination environment exists in the vehicle, good level of MTF imaging index by adopting a glass-plastic mixed design scheme, reasonable focal power distribution and material selection, and good imaging performance at high and low temperatures.
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 according to an embodiment of the invention.
Fig. 2 is a graph of MTF in the near infrared 940nm band according to an embodiment of the present invention.
FIG. 3 is a graph showing the MTF at-40℃for an example of the present invention.
FIG. 4 is a graph showing the MTF at high temperature +85℃.
In the figure: a1-first spherical lens A1, C-stop C, B1-second spherical lens B1, B2-first aspherical lens B2, B3-second aspherical lens B3.
Description of the embodiments
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the ultra-small near infrared aspheric optical system includes a first spherical lens A1, a diaphragm C, a second spherical lens B1, a first aspheric lens B2 and a second aspheric lens B3 sequentially arranged from an object side to an image side, wherein the first spherical lens A1 forms a front group a with negative focal power, and the second spherical lens B1, the first aspheric lens B2 and the second aspheric lens B3 form a rear group B with positive focal power.
In the embodiment of the present invention, the first spherical lens A1 is a biconcave lens A1, and the second spherical lens B1 is a biconvex lens B1.
In the embodiment of the invention, the air interval between the first spherical lens A1 and the second spherical lens B1 is 0.65mm; the air interval between the second spherical lens B1 and the first aspherical lens B2 is 0.7mm; the air interval between the first aspherical lens B2 and the second aspherical lens B3 is 0.3mm.
In the embodiment of the present invention, the second spherical lens B1 satisfies the relationship: nd is more than or equal to 1.8, vd is more than or equal to 30; the first aspheric lens B2 satisfies the relation: nd is more than or equal to 1.6, vd is less than or equal to 30; the second aspherical lens B3 satisfies the relation: nd is more than or equal to 1.5, vd is more than or equal to 50, wherein Nd is refractive index, and Vd is Abbe constant.
In an embodiment of the present invention, an imaging method of a subminiature near infrared aspheric optical system includes the following steps: the light rays sequentially pass through the first spherical lens A1, the diaphragm C, the second spherical lens B1, the first aspherical lens B2 and the second aspherical lens B3 to be imaged.
In the embodiment of the invention, the technical indexes of the implementation of the optical system are as follows:
(1) Focal length: effl=2.5 mm;
(2) F-number=1.7;
(3) Angle of view: 2w is more than or equal to 100 degrees;
(4) TV distortion: < -10%;
(5) The diameter of the imaging circle is larger than phi 4.7;
(6) Working wave band: 940+ -10 nm;
(7) The total optical length TTL is less than or equal to 7.5mm, and the optical back intercept BFL is more than or equal to 2.5mm;
(8) The lens is suitable for a 300-ten thousand-pixel CCD or CMOS camera.
In this embodiment, the lens adopts an inverse distance structure, and the front group a with negative focal power is used to converge the incident angle of the light with large viewing angle; the biconvex lens A2 is made of a high-refractive-index heavy lanthanum flint material, so that the system advanced spherical aberration is reduced; the focal power of each lens is reasonably distributed, so that the focal shift amount at high and low temperatures is reduced, and good MTF performance is realized; the first aspheric lens B2 and the second aspheric lens B3 of the rear group B are close to an image surface, and image field curvature, high-level off-axis spherical aberration and high-level astigmatism are corrected through surface shape bending; by controlling the incidence angles of the light rays on the first aspheric lens B2 and the second aspheric lens B3, the assembly sensitivity of the first aspheric lens B2 and the second aspheric lens B3 is reduced, and the production yield is greatly improved.
In embodiments of the present invention, specific lens parameters are as follows:
in the embodiment of the present invention, as can be seen from fig. 2, the MTF of the optical system in the near infrared 940nm band is good, and can meet the resolution requirement of three million high definition.
In the embodiment of the invention, the MTF curves of the optical system at the low temperature of-40 ℃ and the high temperature of +85 ℃ are shown in the figures 3 and 4, and the MTF in the figures is not much reduced compared with the MTF at normal temperature, so that the use requirements of high and low temperatures can be met.
Terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape are meant to include a state or shape that is similar, analogous 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.
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 (2)
1. A subminiature near infrared aspheric optical system, characterized by: the lens comprises a first spherical lens A1, a diaphragm C, a second spherical lens B1, a first aspherical lens B2 and a second aspherical lens B3 which are sequentially arranged from an object side to an image side, wherein the first spherical lens A1 forms a front group A with negative focal power, and the second spherical lens B1, the first aspherical lens B2 and the second aspherical lens B3 form a rear group B with positive focal power;
the first spherical lens A1 is a biconcave lens A1, and the second spherical lens B1 is a biconvex lens B1;
the air interval between the first spherical lens A1 and the second spherical lens B1 is 0.65mm; the air interval between the second spherical lens B1 and the first aspherical lens B2 is 0.7mm; the air interval between the first aspheric lens B2 and the second aspheric lens B3 is 0.3mm;
the second spherical lens B1 satisfies the relation: nd is more than or equal to 1.8, vd is more than or equal to 30; the first aspheric lens B2 satisfies the relation: nd is more than or equal to 1.6, vd is less than or equal to 30; the second aspherical lens B3 satisfies the relation: nd is more than or equal to 1.5, vd is more than or equal to 50, wherein Nd is refractive index, vd is Abbe constant;
the focal length of the ultra-small near infrared aspheric optical system is 2.5mm.
2. An imaging method of a microminiature near infrared aspheric optical system is characterized in that: the subminiature near infrared aspheric optical system comprising as set forth in claim 1, comprising the steps of: the light rays sequentially pass through the first spherical lens A1, the diaphragm C, the second spherical lens B1, the first aspherical lens B2 and the second aspherical lens B3 to be imaged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910311642.6A CN109946816B (en) | 2019-04-18 | 2019-04-18 | Ultra-small near-infrared aspheric optical system and imaging method |
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| CN201910311642.6A CN109946816B (en) | 2019-04-18 | 2019-04-18 | Ultra-small near-infrared aspheric optical system and imaging method |
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| CN109946816A CN109946816A (en) | 2019-06-28 |
| CN109946816B true CN109946816B (en) | 2023-12-08 |
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| CN113376806B (en) * | 2021-06-18 | 2022-07-01 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
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|---|---|---|---|---|
| JP2005091666A (en) * | 2003-09-17 | 2005-04-07 | Nagano Kogaku Kenkyusho:Kk | Imaging lens |
| JP2005275175A (en) * | 2004-03-25 | 2005-10-06 | Miyota Kk | Small zoom lens |
| JP2008065257A (en) * | 2006-09-11 | 2008-03-21 | Fujinon Corp | Zoom lens |
| CN102687054A (en) * | 2009-12-14 | 2012-09-19 | 堂智 | Wide angle lens and system equipped with wide angle lens |
| CN104267483A (en) * | 2014-10-14 | 2015-01-07 | 东莞市宇瞳光学科技有限公司 | Optical system |
| CN106249384A (en) * | 2016-08-30 | 2016-12-21 | 福建福光股份有限公司 | A kind of super economical 3.6mm aspheric surface day and night confocal optical system |
| CN207148398U (en) * | 2017-09-14 | 2018-03-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN209842199U (en) * | 2019-04-18 | 2019-12-24 | 福建福光天瞳光学有限公司 | Subminiature near-infrared aspheric optical system |
-
2019
- 2019-04-18 CN CN201910311642.6A patent/CN109946816B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005091666A (en) * | 2003-09-17 | 2005-04-07 | Nagano Kogaku Kenkyusho:Kk | Imaging lens |
| JP2005275175A (en) * | 2004-03-25 | 2005-10-06 | Miyota Kk | Small zoom lens |
| JP2008065257A (en) * | 2006-09-11 | 2008-03-21 | Fujinon Corp | Zoom lens |
| CN102687054A (en) * | 2009-12-14 | 2012-09-19 | 堂智 | Wide angle lens and system equipped with wide angle lens |
| CN104267483A (en) * | 2014-10-14 | 2015-01-07 | 东莞市宇瞳光学科技有限公司 | Optical system |
| CN106249384A (en) * | 2016-08-30 | 2016-12-21 | 福建福光股份有限公司 | A kind of super economical 3.6mm aspheric surface day and night confocal optical system |
| CN207148398U (en) * | 2017-09-14 | 2018-03-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN209842199U (en) * | 2019-04-18 | 2019-12-24 | 福建福光天瞳光学有限公司 | Subminiature near-infrared aspheric optical system |
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