CN109946816A - Microminiature near-infrared aspheric optical system and imaging method - Google Patents
Microminiature near-infrared aspheric optical system and imaging method Download PDFInfo
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- CN109946816A CN109946816A CN201910311642.6A CN201910311642A CN109946816A CN 109946816 A CN109946816 A CN 109946816A CN 201910311642 A CN201910311642 A CN 201910311642A CN 109946816 A CN109946816 A CN 109946816A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 239000000571 coke Substances 0.000 claims abstract description 4
- 238000009738 saturating Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 230000004297 night vision Effects 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The present invention relates to a kind of microminiature near-infrared aspheric optical systems, the first spherical lens A1, diaphragm C, the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3 including sequence setting from the object side to the image side, wherein the first spherical lens A1 constitutes preceding group of A of negative power, and the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3 constitute rear group of B of positive light coke；The invention further relates to a kind of imaging methods of microminiature near-infrared aspheric optical system.Not only structure design is simple, reasonable by the present invention, and possess ultrashort light path design, it is greatly reduced installation space, camera can be allowed to minimize, with concealment, clear aperture is larger, and night vision imaging effect is good, even if interior no light environment still can blur-free imaging, Mixed Design scheme is moulded using glass, MTF imaging indicators have reached good level, are selected using the distribution of reasonable focal power and material, realize the good imaging performance of high/low temperature.
Description
Technical field
The present invention relates to a kind of microminiature near-infrared aspheric optical system and imaging methods.
Background technique
Current major vehicle-mounted manufacturer is all concentrating research fatigue driving warning monitoring system, which is to pass through optical lens
Driver's facial image is captured, the tired situation of real-time monitoring driver makes early warning to fatigue driving, to safe driving in time
It escorts, it is significant.Since interior light environment is complicated, existing common on-vehicle lens are insufficient in evening images clarity,
Noise is on the high side, seriously affects the judgement identification of early warning system.And for the optical lens of near-infrared 940nm wave band design, night
The case where insufficient light, still can capture clearly image.In addition, such camera lens installation site faces face, it is desirable that have hidden
Covering property, miniaturization structure.
Summary of the invention
In view of the deficiencies in the prior art, technical problem to be solved by the invention is to provide a kind of microminiature near-infrared aspheric
Face optical system and imaging method, it is not only reasonable in design, and also it is good that performance is imaged.
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of microminiature near-infrared aspherics system
System, it is the first spherical lens A1, diaphragm C, the second spherical lens B1 including sequence setting from the object side to the image side, first aspherical
Mirror B2 and the second non-spherical lens B3, wherein the first spherical lens A1 constitutes preceding group of A of negative power, second spherical surface is saturating
Mirror B1, the first non-spherical lens B2 and the second non-spherical lens B3 constitute rear group of B of positive light coke.
Further, the first spherical lens A1 is biconcave lens A1, and the second spherical lens B1 is biconvex lens
B1。
Microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: first spherical surface
Airspace between lens A1 and the second spherical lens B1 is 0.65mm；The second spherical lens B1 and first is aspherical
Airspace between mirror B2 is 0.7mm；Between air between the first non-spherical lens B2 and the second non-spherical lens B3
It is divided into 0.3mm.
Further, the second spherical lens B1 meets relational expression: Nd >=1.8, Vd >=30；Described first is aspherical
Mirror B2 meets relational expression: Nd >=1.6, Vd≤30；The second non-spherical lens B3 meets relational expression: Nd >=1.5, Vd >=50,
Wherein Nd is refractive index, and Vd is Abbe constant.
Further, the focal length F1 of the first spherical lens A1 meets relational expression: -1.5≤F1/F≤- 1.2；Described
The focal length F2 of two spherical lens B1 meets relational expression: 0.8≤F2/F≤1.2；The first non-spherical lens B2 focal length value F3 with
The focal length value F4 of second non-spherical lens B3 meets following relational expression: -3≤F4/F3≤- 5, and wherein F is the total focal length value of camera lens.
A kind of imaging method of microminiature near-infrared aspheric optical system, including microminiature described in above-mentioned any one
Near-infrared aspheric optical system comprising the steps of: it is saturating that light successively passes through the first spherical lens A1, diaphragm C, the second spherical surface
It is imaged after mirror B1, the first non-spherical lens B2 and the second non-spherical lens B3.
Compared with prior art, the invention has the following advantages: the present invention not only structure design is simple, rationally, and
And possess ultrashort light path design, it is greatly reduced installation space, camera can be allowed to minimize, there is concealment, light admission port
Diameter is larger, and night vision imaging effect is good, though interior no light environment still can blur-free imaging, Mixed Design scheme is moulded using glass,
MTF imaging indicators have reached good level, using reasonable focal power distribution and material select, realize high/low temperature it is good at
As performance.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Fig. 1 is the optical texture schematic diagram schematic diagram of the embodiment of the present invention.
Fig. 2 is the MTF curve figure of the near-infrared 940nm wave band of the embodiment of the present invention.
Fig. 3 is -40 DEG C of MTF curves of low temperature of the embodiment of the present invention.
Fig. 4 is+85 DEG C of MTF curves of high temperature of the embodiment of the present invention.
In figure: the second first non-spherical lens B2 of spherical lens B1, B2- of A1- the first spherical lens A1, C- diaphragm C, B1-,
The second non-spherical lens of B3- B3.
Specific embodiment
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate attached drawing, make detailed
Carefully it is described as follows.
As shown in Fig. 1 ~ 4, a kind of microminiature near-infrared aspheric optical system, including sequence setting from the object side to the image side
First spherical lens A1, diaphragm C, the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3, wherein
The preceding group of A, the second spherical lens B1, the first non-spherical lens B2 and second of first spherical lens A1 composition negative power
Rear group of B of non-spherical lens B3 composition positive light coke.
In embodiments of the present invention, the first spherical lens A1 is biconcave lens A1, and the second spherical lens B1 is
Biconvex lens B1.
Microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: first spherical surface
Airspace between lens A1 and the second spherical lens B1 is 0.65mm；The second spherical lens B1 and first is aspherical
Airspace between mirror B2 is 0.7mm；Between air between the first non-spherical lens B2 and the second non-spherical lens B3
It is divided into 0.3mm.
In embodiments of the present invention, the second spherical lens B1 meets relational expression: Nd >=1.8, Vd >=30；Described first
Non-spherical lens B2 meets relational expression: Nd >=1.6, Vd≤30；The second non-spherical lens B3 meets relational expression: Nd >=1.5,
Vd >=50, wherein Nd is refractive index, and Vd is Abbe constant.
In embodiments of the present invention, the focal length F1 of the first spherical lens A1 meets relational expression: -1.5≤F1/F≤-
1.2；The focal length F2 of the second spherical lens B1 meets relational expression: 0.8≤F2/F≤1.2；The first non-spherical lens B2
The focal length value F4 of focal length value F3 and the second non-spherical lens B3 meet following relational expression: -3≤F4/F3≤- 5, and wherein F is camera lens
Total focal length value.
In embodiments of the present invention, a kind of imaging method of microminiature near-infrared aspheric optical system, including above-mentioned
Microminiature near-infrared aspheric optical system described in meaning one comprising the steps of: light successively passes through the first spherical lens
It is imaged after A1, diaphragm C, the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3.
In embodiments of the present invention, the technical indicator that this optical system is realized is as follows:
(1) focal length: EFFL=2.5mm；
(2) number=1.7 aperture F；
(3) field angle: 2w >=100 °；
(4) TV distorts: < -10%；
(5) imaging circular diameter is greater than φ 4.7；
(6) service band: 940 ± 10nm；
(7) optics overall length TTL≤7.5mm, optics rear cut-off distance BFL >=2.5mm；
(8) camera lens is suitable for 3,000,000 pixel CCD or cmos camera.
In the present embodiment, camera lens uses anti-long distance structure, and preceding group of A of negative power is used to restrain entering for big visual angle light
Firing angle；Biconvex lens A2 uses high refractive index heavy-lanthanide flint material, is conducive to reduce system high spherical aberration；It is each by reasonable distribution
The focal power of a eyeglass reduces the Jiao Yiliang of high/low temperature, realizes good MTF performance；The first non-spherical lens B2 of B is organized afterwards
With the second non-spherical lens B3 close to image planes, it is bent by face shape to correct bent image field, advanced oblique spherical aberration and advanced astigmatism；It is logical
Incidence angle of the control light on the first non-spherical lens B2 and the second non-spherical lens B3 is crossed, the first non-spherical lens is reduced
The assembly susceptibility of B2 and the second non-spherical lens B3, greatly improve production yield.
In embodiments of the present invention, specific lens parameters are as follows:
In embodiments of the present invention, as seen from Figure 2, the optical system is good in the MTF performance of near-infrared 940nm wave band,
It can achieve the resolving power demand of 3,000,000 high definitions.
In embodiments of the present invention, Fig. 3 and Fig. 4 is -40 DEG C of low temperature of the optical system and the MTF song of+85 DEG C of high temperature
Line, MTF declines and few compared to room temperature in figure, can satisfy high/low temperature requirement.
For indicating that the term of positional relationship or shape removes applied in any technical solution disclosed in aforementioned present invention
Its otherwise indicated outer meaning includes approximate with its, similar or close state or shape.
Either component provided by the invention by multiple individual component parts either assembled, or one
The separate part that forming technology manufactures.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；Although referring to preferred embodiment pair
The present invention is described in detail, it should be understood by those ordinary skilled in the art that: still can be to of the invention specific
Embodiment is modified or some technical features can be equivalently replaced；Without departing from the spirit of the technical scheme of the invention,
It should all cover within the scope of the technical scheme claimed by the invention.
Claims (6)
1. a kind of microminiature near-infrared aspheric optical system, it is characterised in that: the including sequence setting from the object side to the image side
One spherical lens A1, diaphragm C, the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3, wherein the
One spherical lens A1 constitutes preceding group of A of negative power, and the second spherical lens B1, the first non-spherical lens B2 and second are non-
Rear group of B of spherical lens B3 composition positive light coke.
2. microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: first spherical surface is saturating
Mirror A1 is biconcave lens A1, and the second spherical lens B1 is biconvex lens B1.
3. microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: first spherical surface is saturating
Airspace between mirror A1 and the second spherical lens B1 is 0.65mm；The second spherical lens B1 and the first non-spherical lens
Airspace between B2 is 0.7mm；Airspace between the first non-spherical lens B2 and the second non-spherical lens B3
For 0.3mm.
4. microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: second spherical surface is saturating
Mirror B1 meets relational expression: Nd >=1.8, Vd >=30；The first non-spherical lens B2 meets relational expression: Nd >=1.6, Vd≤30；
The second non-spherical lens B3 meets relational expression: Nd >=1.5, Vd >=50, and wherein Nd is refractive index, and Vd is Abbe constant.
5. microminiature near-infrared aspheric optical system according to claim 1, it is characterised in that: first spherical surface is saturating
The focal length F1 of mirror A1 meets relational expression: -1.5≤F1/F≤- 1.2；The focal length F2 of the second spherical lens B1 meets relational expression:
0.8≤F2/F≤1.2；The focal length value F4 of the first non-spherical lens B2 focal length value F3 and the second non-spherical lens B3 meets such as
Lower relational expression: -3≤F4/F3≤- 5, wherein F is the total focal length value of camera lens.
6. a kind of imaging method of microminiature near-infrared aspheric optical system, it is characterised in that: including such as claim 1 ~ 5 times
Microminiature near-infrared aspheric optical system described in meaning one comprising the steps of: light successively passes through the first spherical lens
It is imaged after A1, diaphragm C, the second spherical lens B1, the first non-spherical lens B2 and the second non-spherical lens B3.
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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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| 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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| CN109946816A true CN109946816A (en) | 2019-06-28 |
| CN109946816B CN109946816B (en) | 2023-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113376806A (en) * | 2021-06-18 | 2021-09-10 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
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| 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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|---|---|---|---|---|
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113376806A (en) * | 2021-06-18 | 2021-09-10 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
| CN113376806B (en) * | 2021-06-18 | 2022-07-01 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
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| CN109946816B (en) | 2023-12-08 |
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