CN109521551B - Large-relative-aperture zero-temperature-drift vehicle-mounted optical system and imaging method - Google Patents
Large-relative-aperture zero-temperature-drift vehicle-mounted optical system and imaging method Download PDFInfo
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- CN109521551B CN109521551B CN201811553126.6A CN201811553126A CN109521551B CN 109521551 B CN109521551 B CN 109521551B CN 201811553126 A CN201811553126 A CN 201811553126A CN 109521551 B CN109521551 B CN 109521551B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 49
- 125000005647 linker group Chemical group 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 230000004075 alteration Effects 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000005286 illumination Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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Abstract
The invention relates to a large relative aperture zero temperature drift vehicle-mounted optical system and an imaging method, wherein the optical image detection system is sequentially provided with a front group A, a diaphragm C and a rear group B along the direction from left to right of light rays, the front group A comprises a meniscus negative lens A1, a meniscus negative lens A2 and a biconvex positive lens A3 which are sequentially arranged, the rear group B comprises a bonding group formed by a meniscus positive lens B1, a biconvex positive lens B2 and a meniscus negative lens B3, the optical system has the advantages of simple structure, reasonable design, larger view angle, smaller distortion, small defocusing amount under the environment of high temperature and low temperature, and can keep normal imaging, and the lens can be matched with a CCD or CMOS chip with 300 ten thousand pixels for use.
Description
Technical Field
The invention relates to a large relative aperture zero temperature drift vehicle-mounted optical system and an imaging method.
Background
The lens is an important component of the vehicle-mounted camera, the current vehicle-mounted lens is in a high-speed development stage, various vehicle-mounted lenses in the market are endlessly layered, but most lenses have the problems of small light flux, high-low temperature defocusing, low illumination, large distortion and the like. When such a lens is used in combination with a camera, it is difficult to actually achieve a higher resolution.
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 large-relative-aperture zero-temperature-drift vehicle-mounted optical system and an imaging method, and the problems of small light quantity, high-low-temperature defocusing, low illumination, large distortion and the like of a vehicle-mounted lens are solved.
In order to solve the technical problems, the technical scheme of the invention is as follows: the large-relative-aperture zero-temperature-drift vehicle-mounted optical system is sequentially provided with a front group A, a diaphragm C and a rear group B along the direction from left to right of light rays, wherein the front group A comprises a meniscus negative lens A1, a meniscus negative lens A2 and a biconvex positive lens A3 which are sequentially arranged, and the rear group B comprises a gluing group formed by a meniscus positive lens B1, a biconvex positive lens B2 and a meniscus negative lens B3.
Further, the air space between the front group a and the rear group B is 2.55mm, the air space between the meniscus negative lens A1 and the meniscus negative lens A2 is 1.4mm, the air space between the meniscus negative lens A2 and the biconvex positive lens A3 is 1.47mm, the air space between the biconvex positive lens A3 and the diaphragm C is 1.15mm, the air space between the diaphragm C and the meniscus positive lens B1 is 1.4mm, and the air space between the meniscus positive lens B1 and the cemented group is 0.1mm.
Further, the focal length of the optical system is f, wherein the focal lengths of the meniscus negative lens A1, the meniscus negative lens A2, the biconvex positive lens A3, the meniscus positive lens B1, the biconvex positive lens B2 and the meniscus negative lens B3 are f1, f2, f3, f4, f5 and f6 respectively; wherein the following ratio is satisfied with the focal length f: -3.5< f1/f < -2.0, -3< f2/f < -2,2.9< f3/f <1.8,5< f4/f <2.5,2.5< f5/f <1, -3.5< f6/f < -2.1.
Further, a parallel plate is arranged between the meniscus negative lens B3 and the IMA image surface.
An imaging method of a large relative aperture zero temperature drift vehicle-mounted optical system comprises the following steps: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
Compared with the prior art, the invention has the following beneficial effects: the lens has the advantages of simple structure, reasonable design, larger view angle, larger relative aperture, smaller distortion, small defocus amount under high and low temperature environments, capability of keeping normal imaging, and capability of being matched with a CCD or CMOS chip with 300 ten thousand pixels.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of an optical system;
FIG. 2 is a graph showing the MTF function value of the visible light of the present optical system;
FIG. 3 shows the MTF values of the present optical system in a low temperature-40 degree environment;
fig. 4 shows MTF values in the high-temperature 105-degree environment of the present optical system.
In the figure:
a-front group; b-rear group; c-diaphragm; D-IMA; a1-a negative meniscus lens; a2-meniscus negative lens; a3-biconvex positive lens; b1-positive meniscus lens; b2-biconvex positive lens; b3-negative meniscus lens.
Detailed Description
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, a large relative aperture zero temperature drift vehicle-mounted optical system is sequentially provided with a front group a, a diaphragm C and a rear group B along the direction of light rays from left to right, wherein the front group a comprises a meniscus negative lens A1, a meniscus negative lens A2 and a biconvex positive lens A3 which are sequentially arranged, and the rear group B comprises a bonding group formed by a meniscus positive lens B1, a biconvex positive lens B2 and a meniscus negative lens B3.
In this embodiment, the air space between the front group a and the rear group B is 2.55mm, the air space between the meniscus negative lens A1 and the meniscus negative lens A2 is 1.4mm, the air space between the meniscus negative lens A2 and the biconvex positive lens A3 is 1.47mm, the air space between the biconvex positive lens A3 and the diaphragm C is 1.15mm, the air space between the diaphragm C and the meniscus positive lens B1 is 1.4mm, and the air space between the meniscus positive lens B1 and the cemented group is 0.1mm.
In this embodiment, the focal length of the optical system is f, where the focal lengths of the meniscus negative lens A1, the meniscus negative lens A2, the biconvex positive lens A3, the meniscus positive lens B1, the biconvex positive lens B2, and the meniscus negative lens B3 are f1, f2, f3, f4, f5, and f6, respectively; wherein the following ratio is satisfied with the focal length f: -3.5< f1/f < -2.0, -3< f2/f < -2,2.9< f3/f <1.8,5< f4/f <2.5,2.5< f5/f <1, -3.5< f6/f < -2.1.
In this embodiment, a parallel plate is disposed between the meniscus negative lens B3 and the IMA image plane.
An imaging method of a large relative aperture zero temperature drift vehicle-mounted optical system comprises the following steps: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
In the embodiment, the invention adopts a six-piece structure, the focal power is reasonably distributed, the front three-piece structure and the rear three-piece structure are adopted, various aberrations are well balanced, the chromatic aberration is corrected by reasonably selecting the glass material of the glued piece, the requirement of higher illumination is realized by controlling the main light angle of light rays, and the lens can normally image in high-temperature and low-temperature environments by optimizing the glass material.
The optical system consists of six full glass spherical lenses, wherein the front three-piece structure is used for suppressing light rays, the front piece is made of materials with higher refractive index, high-grade aberration can be effectively reduced, the rear piece is made of a glued piece, the front piece is made of materials with higher Abbe numbers, the negative piece is made of materials with lower Abbe numbers, chromatic aberration is balanced, and optical thermal compensation is realized through temperature compensation of lenses; other aberrations are balanced through reasonable focal power distribution, and tolerance sensitivity of the lens is reduced.
In this embodiment, the individual lens parameters are as follows:
the specific performance parameters of the optical structure are as follows: focal length: effl=2.8 mm; f number = 1.8; angle of view: 2w is more than or equal to 100 degrees; distortion: < -8%; the diameter of the imaging circle is larger than phi 5; working spectral range: imaging by visible light; the total optical length TTL is less than or equal to 16mm, and the optical back intercept is more than or equal to 5mm; the lens is suitable for a 300 ten thousand-pixel high-resolution CCD or CMOS camera.
As can be seen from fig. 2, the lens has higher resolution, and meets the transfer function requirement of a 300-ten-thousand-pixel CMOS chip.
As can be seen from fig. 3 and fig. 4, the MTF attenuation of the lens is small in the environments of 105 ℃ at high temperature and-40 ℃ at low temperature, and the zero temperature drift performance of the lens is basically realized.
Compared with other lenses, the lens has the following advantages: the TTL is short, the structure is compact, and the requirements of the vehicle-mounted lens on the total length are met; the relative aperture is larger, the illuminance is high, and the picture brightness is good; under the high-low temperature test environment (-40 to 105 ℃), the imaging quality is not affected by temperature; the cost is low, a six-piece structure is adopted, and the selected glass material is relatively cheap; by reasonably adjusting the structure and the distance of the glass spherical surface, the tolerance sensitivity is good, and the assembly and the debugging are easy.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. The utility model provides a big relative aperture zero temperature floats on-vehicle optical system which characterized in that: the optical system is sequentially provided with a front group A, a diaphragm C and a rear group B along the direction of light rays from left to right, wherein the front group A comprises a meniscus negative lens A1, a meniscus negative lens A2 and a biconvex positive lens A3 which are sequentially arranged, and the rear group B comprises a bonding group formed by a meniscus positive lens B1, a biconvex positive lens B2 and a meniscus negative lens B3 which are sequentially arranged; the air interval between the front group A and the rear group B is 2.55mm, the air interval between the meniscus negative lens A1 and the meniscus negative lens A2 is 1.4mm, the air interval between the meniscus negative lens A2 and the biconvex positive lens A3 is 1.47mm, the air interval between the biconvex positive lens A3 and the diaphragm C is 1.15mm, the air interval between the diaphragm C and the meniscus positive lens B1 is 1.4mm, and the air interval between the meniscus positive lens B1 and the bonding group is 0.1mm; the focal length of the optical system is f, wherein the focal lengths of the meniscus negative lens A1, the meniscus negative lens A2, the biconvex positive lens A3, the meniscus positive lens B1, the biconvex positive lens B2 and the meniscus negative lens B3 are respectively f1, f2, f3, f4, f5 and f6; wherein the following ratio is satisfied with the focal length f: -3.5< f1/f < -2.0, -3< f2/f < -2,2.9< f3/f <1.8,5< f4/f <2.5,2.5< f5/f <1, -3.5< f6/f < -2.1; a parallel flat plate is arranged between the meniscus negative lens B3 and the IMA image surface; the individual lens parameters are listed in the following table:
。
2. an imaging method of a large relative aperture zero temperature drift vehicle-mounted optical system, adopting the large relative aperture zero temperature drift vehicle-mounted optical system as defined in claim 1, characterized in that: the light path sequentially enters the front group A, the diaphragm C and the rear group B for imaging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811553126.6A CN109521551B (en) | 2018-12-18 | 2018-12-18 | Large-relative-aperture zero-temperature-drift vehicle-mounted optical system and imaging method |
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| CN201811553126.6A CN109521551B (en) | 2018-12-18 | 2018-12-18 | Large-relative-aperture zero-temperature-drift vehicle-mounted optical system and imaging method |
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| CN109521551A CN109521551A (en) | 2019-03-26 |
| CN109521551B true CN109521551B (en) | 2023-11-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068917A (en) * | 2019-05-05 | 2019-07-30 | 昆明科茂机电技术有限公司 | A kind of on-vehicle lens and on-vehicle lens mould group |
| CN110456477B (en) * | 2019-07-30 | 2024-07-05 | 福建福光天瞳光学有限公司 | Low-distortion rearview optical system and imaging method |
| CN110554488B (en) * | 2019-08-31 | 2024-07-05 | 福建福光天瞳光学有限公司 | Small day and night vehicle-mounted optical system and working method thereof |
| CN110727088B (en) * | 2019-10-17 | 2021-12-28 | 福建福光股份有限公司 | Wide-angle high-low temperature-resistant fixed-focus lens and working method thereof |
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| CN203311085U (en) * | 2013-06-28 | 2013-11-27 | 东莞市宇瞳光学科技有限公司 | Wide-angle prime lens |
| CN106908938A (en) * | 2017-04-05 | 2017-06-30 | 舜宇光学(中山)有限公司 | A kind of aspherical fish eye lens |
| CN107741633A (en) * | 2017-11-30 | 2018-02-27 | 福建福光股份有限公司 | 1.3mm focal lengths panorama day and night confocal optical system |
| CN107976768A (en) * | 2017-12-29 | 2018-05-01 | 福建福光光电科技有限公司 | A kind of big thang-kng zero temp shift optical texture of uniform thickness 3mm and its imaging method |
| CN209343019U (en) * | 2018-12-18 | 2019-09-03 | 福建福光天瞳光学有限公司 | The vehicle-mounted optical system of object lens of large relative aperture zero temp shift |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4947700B2 (en) * | 2006-09-21 | 2012-06-06 | 富士フイルム株式会社 | Wide-angle imaging lens, imaging device, and camera module |
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| CN203311085U (en) * | 2013-06-28 | 2013-11-27 | 东莞市宇瞳光学科技有限公司 | Wide-angle prime lens |
| CN106908938A (en) * | 2017-04-05 | 2017-06-30 | 舜宇光学(中山)有限公司 | A kind of aspherical fish eye lens |
| CN107741633A (en) * | 2017-11-30 | 2018-02-27 | 福建福光股份有限公司 | 1.3mm focal lengths panorama day and night confocal optical system |
| CN107976768A (en) * | 2017-12-29 | 2018-05-01 | 福建福光光电科技有限公司 | A kind of big thang-kng zero temp shift optical texture of uniform thickness 3mm and its imaging method |
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