CN110333591B - 0.95mm vehicle-mounted high-definition looking-around optical system and imaging method thereof - Google Patents
0.95mm vehicle-mounted high-definition looking-around optical system and imaging method thereof Download PDFInfo
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- CN110333591B CN110333591B CN201910664082.2A CN201910664082A CN110333591B CN 110333591 B CN110333591 B CN 110333591B CN 201910664082 A CN201910664082 A CN 201910664082A CN 110333591 B CN110333591 B CN 110333591B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 238000003384 imaging method Methods 0.000 title claims abstract description 15
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 230000005499 meniscus Effects 0.000 claims abstract description 4
- 230000004075 alteration Effects 0.000 claims description 13
- 230000035945 sensitivity Effects 0.000 claims description 4
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- 230000009286 beneficial effect Effects 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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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
- 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
- G02B13/004—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 four lenses
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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
- 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
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
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- 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
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention relates to a 0.95mm vehicle-mounted high-definition looking-around optical system, which comprises a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged at intervals along a light incident light path from front to back, wherein the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is a biconvex positive lens, the second aspheric lens and the third aspheric lens are closely connected to form a gluing group, and the fourth aspheric lens is biconvex positive lens; the invention also relates to an imaging method of the vehicle-mounted high-definition all-round optical system with the thickness of 0.95 mm. The invention has the characteristics of reasonable structure, simple and convenient operation, clear image quality, low temperature drift and the like.
Description
Technical Field
The invention relates to a 0.95mm vehicle-mounted high-definition looking-around optical system and an imaging method thereof.
Background
The vehicle-mounted all-round lens is widely applied to a vehicle-mounted auxiliary driving system and is required to have the characteristics of high definition of image quality, wide imaging angle, small size and the like. Many vehicle-mounted all-round lenses in the market at present adopt glass-plastic design schemes to overcome the defects of insufficient imaging quality and large volume caused by full glass design. With the development of the automobile industry, the requirements for miniaturization and high image quality are further increased. The conventional vehicle-mounted all-round lens has the defects of general imaging effect, insufficient night brightness, large high-low temperature drift and the like.
Disclosure of Invention
In view of the above, the invention aims to provide a vehicle-mounted high-definition looking-around optical system with the thickness of 0.95mm and an imaging method thereof, which have the characteristics of reasonable structure, simple and convenient operation, clear image quality, low temperature drift and the like.
The technical scheme of the invention is as follows: a0.95 mm vehicle-mounted high-definition all-around optical system comprises a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged at intervals from front to back along a light incident light path; the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is biconvex positive lens, and the first spherical lens and the first aspheric lens form a front group lens with negative focal power; the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens; the second aspheric lens and the third aspheric lens are closely connected to form a gluing group, the fourth aspheric lens is a biconvex positive lens, and the second aspheric lens and the third aspheric lens form a rear group lens with positive focal power.
Further, the air space between the first spherical lens and the first aspherical lens is 1.65mm, the air space between the first aspherical lens and the second spherical lens is 1.5mm, the air space between the second spherical lens and the second aspherical lens is 0.35mm, and the air space between the third aspherical lens and the fourth aspherical lens is 0.1mm.
Further, the total focal length of the optical system is set to f, and the focal lengths of the first spherical lens, the first aspherical lens, the second spherical lens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are sequentially set toThe following relationship is satisfied:
。
further, the refractive index of the first spherical lens is set to N d1 The refractive index of the first aspheric lens is set to N d2 The refractive index of the second spherical lens is set to N d3 Setting the refractive index of the second aspheric lens to N d4 The refractive index of the third aspheric lens is set to N d5 The refractive index of the fourth aspherical lens is set to N d6 The refractive index of each lens satisfies the following relationship: n (N) d1 ≥1.7；N d2 ≥1.5；N d3 ≥1.8；N d4 ≥1.6；N d5 ≥1.5；N d6 ≥1.5。
Further, the Abbe coefficient of the first spherical lens is set to V d1 The Abbe coefficient of the first aspheric lens is set to V d2 Setting the Abbe coefficient of the second spherical lens to V d3 Setting the Abbe coefficient of the second aspheric lens to V d4 Setting the Abbe coefficient of the third aspheric lens to V d5 The refractive index of the fourth aspherical lens is set to V d6 The abbe coefficients of the lenses satisfy the following relationship: v (V) d1 ≥45；V d2 ≥50；V d3 ≤25；V d4 ≤30；V d5 ≥50；V d5 ≥50。
Further, the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are all made of plastic materials.
Further, a filter is provided at the rear end of the fourth aspherical lens.
The imaging method of the 0.95mm vehicle-mounted high-definition all-around optical system comprises the following steps of: (1) The light passes through the first spherical lens, the first aspherical lens, the second spherical lens, the diaphragm, the second aspherical lens, the third aspherical lens and the fourth aspherical lens in sequence from front to back and then reaches an image surface to form images, when the light passes through the front group of lenses, the negative focal power of the front group of lenses can correct the positive focal power aberration of the rear group of lenses, and meanwhile, the front group of lenses is provided with the first aspherical lens between the first spherical lens and the second spherical lens, and when the light passes through, the high-low temperature focus drift of the whole optical system can be compensated; (2) The first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens can correct all the advanced aberration and spherical aberration, the whole lens ensures the approximate proportion distribution of refractive index and focal power of the lens, the balance of the incidence angles of the lenses of the front group of lenses and the lenses of the rear group of lenses is ensured, the sensitivity of the lens is further reduced, and meanwhile, the four aspheric lenses are four plastic aspheric surfaces, and the image quality is good; (3) The front lens is of negative focal power, the rear lens is of positive focal power, when light is incident, the angle of the field of view can reach 200 degrees, and the pictures can be ensured to be clear in severe environments with different temperatures, so that normal use can be ensured in high-low temperature environments.
Compared with the prior art, the invention has the beneficial effects that: the invention has simple and reasonable design, and by introducing a group of aspheric lens bonding groups to correct spherical aberration, chromatic aberration and advanced aberration, not only reduces assembly sensitivity and improves yield, is beneficial to mass production, but also improves imaging quality and reaches a two-million-pixel shooting level; and the focal power of each lens is reasonably calculated, and one aspheric lens is added into two glass lenses to correct the focal drift of the optical system under the high-temperature and low-temperature environments, so that the imaging is clear in a wider temperature range from minus 40 ℃ to +85 ℃.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings.
Drawings
FIG. 1 is a schematic view of an optical structure of 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 high temperature-40℃MTF defocus curve of an embodiment of the present invention;
FIG. 4 is a high temperature +85℃MTFdefocus curve of an example of the present invention;
in the figure: 100-front group lens; 110-a first spherical lens; 120-a first aspheric lens; 130-a second spherical lens; 200-rear group lens; 210-a second aspheric lens; 220-a third aspheric lens; 230-fourth aspheric lens; 300-diaphragm; 400-optical filter.
Description of the embodiments
As shown in fig. 1, the vehicle-mounted high-definition looking-around optical system with the thickness of 0.95mm comprises a first spherical lens, a first aspherical lens, a second spherical lens, a diaphragm, a second aspherical lens, a third aspherical lens and a fourth aspherical lens which are sequentially arranged at intervals from front to back along a light incident light path; the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is biconvex positive lens, and the first spherical lens and the first aspheric lens form a front group lens with negative focal power; the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens; the second aspheric lens and the third aspheric lens are closely connected to form a gluing group, the fourth aspheric lens is a biconvex positive lens, and the second aspheric lens and the third aspheric lens form a rear group lens with positive focal power.
In this embodiment, the air space between the first spherical lens and the first aspherical lens is 1.65mm, the air space between the first aspherical lens and the second spherical lens is 1.5mm, the air space between the second spherical lens and the second aspherical lens is 0.35mm, and the air space between the third aspherical lens and the fourth aspherical lens is 0.1mm.
In the present embodiment, the total focal length of the optical system is set to f, and the focal lengths of the first spherical lens, the first aspherical lens, the second spherical lens, the second aspherical lens, the third aspherical lens, and the fourth aspherical lens are sequentially set toThe following relationship is satisfied:
。
in the present embodiment, the refractive index of the first spherical lens is set to N d1 The refractive index of the first aspheric lens is set to N d2 The refractive index of the second spherical lens is set to N d3 Setting the refractive index of the second aspheric lens to N d4 The refractive index of the third aspheric lens is set to N d5 Transmitting the fourth aspheric surfaceThe refractive index of the mirror is set to N d6 The refractive index of each lens satisfies the following relationship: n (N) d1 ≥1.7；N d2 ≥1.5；N d3 ≥1.8；N d4 ≥1.6；N d5 ≥1.5；N d6 ≥1.5。
In the present embodiment, the Abbe coefficient of the first spherical lens is set to V d1 The Abbe coefficient of the first aspheric lens is set to V d2 Setting the Abbe coefficient of the second spherical lens to V d3 Setting the Abbe coefficient of the second aspheric lens to V d4 Setting the Abbe coefficient of the third aspheric lens to V d5 The refractive index of the fourth aspherical lens is set to V d6 The abbe coefficients of the lenses satisfy the following relationship: v (V) d1 ≥45；V d2 ≥50；V d3 ≤25；V d4 ≤30；V d5 ≥50；V d5 ≥50。
In this embodiment, the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are made of plastic materials.
In this embodiment, an optical filter is disposed at the rear end of the fourth aspherical lens.
Table 1, specific lens parameters are as follows
In the embodiment, six lenses are taken as an example, and the focal power, the surface type, the center thickness of each lens, the axial spacing between the lenses and the like of each lens are reasonably distributed, so that the field angle of the lens is effectively enlarged, the total length of the lens is shortened, and the small distortion and high illumination of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and imaging quality of the lens are improved. Each aspherical surface profile Z is defined by the following formula:
wherein,,is aspheric and has a height of +.>Is higher than the distance vector from the vertex of the aspheric surface; />Paraxial curvature, which is aspherical, +.>(i.e., paraxial curvature->Is the radius of curvature +.>The reciprocal of (2); />Is a conic constant; A. b, C, D, E are all high order coefficients. Table 2 below shows the conic constant k and the higher order coefficient A, B, C, D, E that can be used for each aspherical lens surface in this embodiment.
Table 2 aspherical lens parameters
In this embodiment, the technical indexes of the implementation of the optical system are as follows:
(1) Focal length: effl=0.95 mm; (2) aperture f=2.0; (3) angle of view: 2w is more than or equal to 200 degrees; (4) optical distortion: 120 < - >; (5) imaging circle diameter is greater than phi 4; (6) operating band: 420-700 nm; (7) The total optical length TTL is less than or equal to 12.9mm, and the optical back intercept BFL is more than or equal to 2mm; (8) the lens is suitable for a 200-ten thousand pixel CCD or CMOS camera.
An imaging method of a 0.95mm vehicle-mounted high-definition all-around optical system comprises the following steps of: (1) The light passes through the first spherical lens, the first aspherical lens, the second spherical lens, the diaphragm, the second aspherical lens, the third aspherical lens and the fourth aspherical lens in sequence from front to back and then reaches an image surface to form images, when the light passes through the front group of lenses, the negative focal power of the front group of lenses can correct the positive focal power aberration of the rear group of lenses, and meanwhile, the front group of lenses is provided with the first aspherical lens between the first spherical lens and the second spherical lens, and when the light passes through, the high-low temperature focus drift of the whole optical system can be compensated; (2) The first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens can correct all the advanced aberration and spherical aberration, the whole lens ensures the approximate proportion distribution of refractive index and focal power of the lens, the balance of the incidence angles of the lenses of the front group of lenses and the lenses of the rear group of lenses is ensured, the sensitivity of the lens is further reduced, and meanwhile, the four aspheric lenses are four plastic aspheric surfaces, and the image quality is good; (3) The front lens is of negative focal power, the rear lens is of positive focal power, when light is incident, the angle of the field of view can reach 200 degrees, and the pictures can be ensured to be clear in severe environments with different temperatures, so that normal use can be ensured in high-low temperature environments.
As can be seen from fig. 2, the MTF of the optical system in the visible light band is excellent, and can meet the requirement of resolution of two million high-definition. FIGS. 3 and 4 show MTF defocus curves of the optical system at-40deg.C and +85deg.C, wherein the defocus amount at low temperature is 14 μm, the defocus amount at high temperature is 6 μm, and MTF attenuation is small, so as to completely satisfy high-low temperature image definition.
The above operation procedures and software and hardware configurations are only preferred embodiments of the present invention, and are not limited to the scope of the present invention, and all equivalent changes made by the descriptions and the drawings of the present invention, or direct or indirect application in the related technical field, are equally included in the scope of the present invention.
Claims (7)
1. A0.95 mm on-vehicle high definition optical system that looks around, its characterized in that: the device consists of a first spherical lens, a first aspheric lens, a second spherical lens, a diaphragm, a second aspheric lens, a third aspheric lens and a fourth aspheric lens which are sequentially arranged at intervals from front to back along a light incident light path;
the first spherical lens and the first aspheric lens are meniscus negative lenses, the second spherical lens is biconvex positive lens, and the first spherical lens and the first aspheric lens form a front group lens with negative focal power;
the second aspheric lens is a biconcave negative lens, and the third aspheric lens is a biconvex positive lens;
the second aspheric lens and the third aspheric lens are closely connected to form a gluing group, the fourth aspheric lens is a biconvex positive lens, and the second aspheric lens and the third aspheric lens form a rear group lens with positive focal power;
let the optical power of the first spherical lens be D1, D1 satisfying the following relationship: -0.19 < D1 < -0.16;
the air interval between the first spherical lens and the first aspheric lens is 1.65mm, the air interval between the first aspheric lens and the second spherical lens is 1.5mm, the air interval between the second spherical lens and the second aspheric lens is 0.35mm, and the air interval between the third aspheric lens and the fourth aspheric lens is 0.1mm.
2. The 0.95mm vehicle-mounted high-definition all-around optical system according to claim 1, wherein: setting the total focal length of the optical system as f, and sequentially setting the focal lengths of the first spherical lens, the first aspherical lens, the second spherical lens, the second aspherical lens, the third aspherical lens and the fourth aspherical lens asThe following relationship is satisfied:
。
3. the 0.95mm vehicle-mounted high-definition all-around optical system according to claim 2, wherein: setting the refractive index of the first spherical lens to N d1 The refractive index of the first aspheric lens is set to N d2 The refractive index of the second spherical lens is set to N d3 Setting the refractive index of the second aspheric lens to N d4 The refractive index of the third aspheric lens is set to N d5 The refractive index of the fourth aspherical lens is set to N d6 The refractive index of each lens satisfies the following relationship: n (N) d1 ≥1.7；N d2 ≥1.5；N d3 ≥1.8；N d4 ≥1.6；N d5 ≥1.5；N d6 ≥1.5。
4. A 0.95mm on-board high definition see-around optical system according to claim 3, wherein: setting the Abbe coefficient of the first spherical lens to V d1 The Abbe coefficient of the first aspheric lens is set to V d2 Setting the Abbe coefficient of the second spherical lens to V d3 Setting the Abbe coefficient of the second aspheric lens to V d4 Setting the Abbe coefficient of the third aspheric lens to V d5 The refractive index of the fourth aspherical lens is set to V d6 The abbe coefficients of the lenses satisfy the following relationship: v (V) d1 ≥45；V d2 ≥50；V d3 ≤25；V d4 ≤30；V d5 ≥50；V d5 ≥50。
5. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 4, wherein: the first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens are all made of plastic materials.
6. The 0.95mm vehicle-mounted high-definition all-round optical system according to claim 5, wherein: and the rear end of the fourth aspheric lens is provided with an optical filter.
7. An imaging method of a 0.95mm vehicle-mounted high-definition see-around optical system, comprising the 0.95mm vehicle-mounted high-definition see-around optical system according to claim 6, wherein: (1) The light passes through the first spherical lens, the first aspherical lens, the second spherical lens, the diaphragm, the second aspherical lens, the third aspherical lens and the fourth aspherical lens in sequence from front to back and then reaches an image surface to form images, when the light passes through the front group of lenses, the negative focal power of the front group of lenses can correct the positive focal power aberration of the rear group of lenses, and meanwhile, the front group of lenses is provided with the first aspherical lens between the first spherical lens and the second spherical lens, and when the light passes through, the high-low temperature focus drift of the whole optical system can be compensated; (2) The first aspheric lens, the second aspheric lens, the third aspheric lens and the fourth aspheric lens can correct all the advanced aberration and spherical aberration, the whole lens ensures the approximate proportion distribution of refractive index and focal power of the lens, the balance of the incidence angles of the lenses of the front group of lenses and the lenses of the rear group of lenses is ensured, the sensitivity of the lens is further reduced, and meanwhile, the four aspheric lenses are four plastic aspheric surfaces, and the image quality is good; (3) The front lens is of negative focal power, the rear lens is of positive focal power, when light is incident, the angle of the field of view can reach 200 degrees, and the pictures can be ensured to be clear in severe environments with different temperatures, so that normal use can be ensured in high-low temperature environments.
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| CN112285884B (en) * | 2020-10-28 | 2022-05-27 | 福建福光天瞳光学有限公司 | 1.14mm ultra-wide angle optical system and imaging method thereof |
| CN114942511B (en) * | 2022-05-05 | 2024-05-10 | 福建福光天瞳光学有限公司 | Large-view-range large-imaging-area optical lens and imaging method thereof |
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| JP2002072085A (en) * | 2000-09-01 | 2002-03-12 | Matsushita Electric Ind Co Ltd | Super-wide-angle lens |
| CN101359087A (en) * | 2007-08-02 | 2009-02-04 | 鸿富锦精密工业（深圳）有限公司 | Wide-angle lens and vehicle apparatus using the wide-angle lens |
| CN108957705A (en) * | 2018-09-05 | 2018-12-07 | 利达光电股份有限公司 | A kind of no thermalization ultra-wide angle high definition on-vehicle lens |
| CN210742595U (en) * | 2019-07-23 | 2020-06-12 | 福建福光天瞳光学有限公司 | 0.95mm vehicle-mounted high-definition all-round-looking optical system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002072085A (en) * | 2000-09-01 | 2002-03-12 | Matsushita Electric Ind Co Ltd | Super-wide-angle lens |
| CN101359087A (en) * | 2007-08-02 | 2009-02-04 | 鸿富锦精密工业（深圳）有限公司 | Wide-angle lens and vehicle apparatus using the wide-angle lens |
| CN108957705A (en) * | 2018-09-05 | 2018-12-07 | 利达光电股份有限公司 | A kind of no thermalization ultra-wide angle high definition on-vehicle lens |
| CN210742595U (en) * | 2019-07-23 | 2020-06-12 | 福建福光天瞳光学有限公司 | 0.95mm vehicle-mounted high-definition all-round-looking optical system |
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