CN108107556B - Lens of vehicle-mounted ADAS panoramic camera - Google Patents
Lens of vehicle-mounted ADAS panoramic camera Download PDFInfo
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- CN108107556B CN108107556B CN201810047491.3A CN201810047491A CN108107556B CN 108107556 B CN108107556 B CN 108107556B CN 201810047491 A CN201810047491 A CN 201810047491A CN 108107556 B CN108107556 B CN 108107556B
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/0045—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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides a lens of a vehicle-mounted ADAS panoramic camera, and belongs to the technical field of shooting and imaging. The technical problems of serious perspective distortion and the like of the lens of the existing ADAS panoramic camera are solved. The lens of the vehicle-mounted ADAS panoramic camera sequentially comprises from an object plane to an image plane: the lens comprises a first lens group with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power, wherein a diaphragm is arranged between the second lens and the third lens. The invention has the advantage of high definition imaging.
Description
Technical Field
The invention belongs to the technical field of shooting and imaging, and relates to a lens of a vehicle-mounted ADAS panoramic camera.
Background
Along with the popularization of automobiles and the improvement of the living standard of people, the requirements of people on the intellectualization of automobiles and the driving safety are also higher and higher, and the vehicle-mounted ADAS provides a very good solution for people in this aspect. The vehicle-mounted ADAS panoramic camera can carry out panoramic shooting on the 360-degree range of the whole automobile, and the safety of driving and the intellectualization of the automobile are greatly improved by matching with a software system.
The lenses of the existing on-vehicle ADAS panoramic cameras on the market are negative fθ (perspective distortion) distortion, the smaller the fθ value is, the more serious the perspective distortion is, which causes the conditions that the periphery of an image is compressed and the center is too prominent, and is not beneficial to image splicing and the observation of the peripheral condition of the vehicle by a user; the lens resolution of the on-vehicle ADAS panoramic camera on the market is insufficient, the image quality is poor, and most of the definition of the on-vehicle lens is still at 720P level, which can not meet the requirements of people on the definition of the on-vehicle image; the lens aperture of the on-vehicle ADAS panoramic camera on the market is small, and most of FNOs are above 2, which results in difficulty in obtaining more picture details under the condition of low illumination such as cloudy days, night and the like.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a lens of a vehicle-mounted ADAS panoramic camera, which aims to enable surrounding images of a picture to be more real.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a camera lens of on-vehicle ADAS panoramic camera which characterized in that, camera lens includes from object plane to image plane in proper order: a first lens group with negative focal power, a second lens with positive focal power, a third lens with positive focal power, and a third lens with negative focal powerA diaphragm is arranged between the second lens and the third lens; the focal length of the first lens group is f 1 ，f 1 The method meets the following conditions: -1.8mm < f 1 -0.8mm; the focal length of the second lens is f 2 The focal length of the third lens is f 3 ，f 2 And f 3 The method meets the following conditions:the focal length of the fourth lens is f 4 The focal length of the fifth lens is f 5 ，f 4 And f 5 The method meets the following conditions: />
The object plane is the light-in plane of the lens, and the image plane is the light-receiving plane of the solid-state imaging element such as CCD or CMOS; the positive fθ distortion of the lens can be realized through the combined lens, so that the image of the periphery of the picture is more real, and the spliced image is more beneficial to the observation of the peripheral condition of the vehicle by a user.
The first lens group with negative focal power ensures a large field angle of the lens, effectively reduces the caliber of the front end of the lens, and has good effects of eliminating astigmatism, field curvature and controlling distortion. The second lens and the third lens further correct various aberrations through mutual matching among lenses, and high resolution of the lens is guaranteed. The fourth lens and the fifth lens are two aspheric lenses continuously, so that the distortion is reduced, and meanwhile, the high resolution of the vehicle-mounted lens is ensured. In order to restrain strong light and an automobile headlamp, a proper combination of curvature radii of the surfaces of the lenses is adopted, so that obvious ghost images cannot be generated, and the risk of generating parasitic light is reduced.
In the lens of the vehicle-mounted ADAS panoramic camera, the first lens group comprises a first lens close to the object plane and a first lens located on the inner side of the first lens, two mirror surfaces of the first lens are spherical surfaces, and two mirror surfaces of the first lens are aspheric surfaces. The structure can ensure that the lens can realize the positive fθ distortion of the lens, so that the peripheral image of the picture is more real.
As another aspect, in the lens of the on-vehicle ADAS panoramic camera, the first lens group (G1) includes a first lens group near the object plane, a first lens group second and a first lens group third located inside the first lens group, two mirror surfaces of the first lens group are spherical surfaces, two mirror surfaces of the first lens group second are aspherical surfaces, and two mirror surfaces of the first lens group third are aspherical surfaces. The structure can ensure that the lens can realize the positive fθ distortion of the lens, so that the peripheral image of the picture is more real.
In the lens of the vehicle-mounted ADAS panoramic camera, an optical filter and a protective glass are sequentially arranged between the fifth lens and the image surface.
In the lens of the on-vehicle ADAS panoramic camera, the first lens is a meniscus lens and the convex surface faces the object.
In the above-mentioned lens of the on-vehicle ADAS panoramic camera, the first lens has a refractive index n d The method meets the following conditions: n is more than 1.87 and less than 1 d < 2.00. Satisfies the above light refractive index n d The first lens has the characteristic of high refractive index, and can meet the requirement of miniaturization of the lens.
In the above-mentioned lens of the on-vehicle ADAS panoramic camera, the abbe constant V of the third lens d The method meets the following conditions: 81.5 < V d < 95.1. Meets the Abbe constant V d The third lens has the characteristic of low dispersion, has good correction effects on spherical aberration, chromatic aberration and coma aberration, can greatly eliminate axial chromatic aberration of the system, and realizes clear imaging of peripheral view fields.
In the above-mentioned lens of the onboard ADAS panoramic camera, the front diameter of the lens is D 1 The total length of the lens is L, D 1 And L satisfies:l is the distance between the center of the mirror surface of the first lens close to the object plane and the image plane; the structure can ensure that the lens can realize the positive fθ distortion of the lens, so that the peripheral image of the picture is more real.
Compared with the prior art, the lens of the vehicle-mounted ADAS panoramic camera can realize panoramic shooting on the premise that the f-number is 1.8, the front end diameter is smaller than 14mm, and the total length is smaller than 18mm, and can output high-definition image quality of 1.3M or even 2M; the design is further optimized to reasonably distribute the surface curvature and the material of the aspheric lens, so that the ghost image and the parasitic light energy of the lens are well inhibited in a strong light environment, the high-definition imaging quality in a high-low temperature environment is also ensured, and the high-definition imaging device has the advantage of high-definition imaging.
Drawings
Fig. 1 is a schematic optical structure of a lens in embodiment 1.
Fig. 2 is an axial chromatic aberration diagram of the lens barrel in embodiment 1.
Fig. 3 is an image plane curvature of lens barrel in embodiment 1.
Fig. 4 is a schematic optical structure of the lens barrel in embodiment 2.
Fig. 5 is an axial chromatic aberration diagram of the lens barrel in embodiment 2.
Fig. 6 is an image plane curvature of lens barrel in embodiment 2.
In the figure, 1, a first lens; 11. a first lens II; 12. a first lens III; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a diaphragm; 7. a light filter; 8. a protective glass; 9. an image plane.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example 1
As shown in fig. 1, the lens of the on-vehicle ADAS panoramic camera sequentially includes, from an object plane to an image plane 9: a first lens group having negative optical power, a second lens 2 having positive optical power, a third lens 3 having positive optical power, a fourth lens 4 having negative optical power, and a fifth lens 5 having positive optical power; a diaphragm 6 is arranged between the second lens 2 and the third lens 3, and an optical filter 7 and a protective glass 8 are sequentially arranged between the fifth lens 5 and an image surface 9.
The focal length of the first lens group is f 1 ，f 1 The method meets the following conditions: -1.8mm < f 1 -0.8mm; the focal length of the second lens 2 is f 2 The focal length of the third lens 3 is f 3 ，f 2 And f 3 The method meets the following conditions:the focal length of the fourth lens 4 is f 4 The focal length of the fifth lens 5 is f 5 ，f 4 And f 5 The method meets the following conditions: />
The first lens group (G1) comprises a first lens 1 close to an object plane, a first lens second 11 and a first lens third 12, wherein the first lens second 11 and the first lens third 12 are positioned on the inner side of the first lens 1, two mirror surfaces of the first lens 1 are spherical surfaces, two mirror surfaces of the first lens second 11 are aspheric surfaces, and two mirror surfaces of the first lens third 12 are aspheric surfaces. Refractive index n of first lens 1 d The method meets the following conditions: n is more than 1.87 and less than 1 d ＜2.00。
Abbe constant V of the third lens 3 d The method meets the following conditions: 81.5 < V d < 95.1. The front jade diameter of the lens is D 1 The total length of the lens is L, D 1 And L satisfies:in the first embodiment, the refractive index n of the first lens 1 is set d Abbe constant V of the third lens 3 =1.95 d ＝81.6；
The optical structure parameters are provided in the following table:
| face number | Radius of curvature (mm) | Center thickness (mm) | Refractive index n d | Abbe constant V d | |
| S1 | Spherical surface | 8.947 | 0.65 | 1.95 | 32.3 |
| S2 | Spherical surface | 3.941 | 1.65 | ||
| S3 | Aspherical surface | 21.384 | 0.37 | 1.53 | 56 |
| S4 | Aspherical surface | 2.156 | 1.35 | ||
| S5 | Spherical surface | -4.965 | 0.50 | 1.77 | 49.6 |
| S6 | Spherical surface | 4.614 | 0.10 | ||
| S7 | Aspherical surface | 2.754 | 4.40 | 1.63 | 23 |
| S8 | Aspherical surface | -8.065 | 0.10 | ||
| Diaphragm 6 | Spherical surface | Infinite number of cases | 0.10 | ||
| S10 | Spherical surface | 3.246 | 1.93 | 1.49 | 81.6 |
| S11 | Spherical surface | -3.656 | 0.30 | ||
| S12 | Aspherical surface | -11.687 | 1.47 | 1.63 | 23 |
| S13 | Aspherical surface | 2.243 | 0.16 | ||
| S14 | Aspherical surface | 2.589 | 2.11 | 1.53 | 56 |
| S15 | Aspherical surface | 2.446 | 0.10 | ||
| S16 | Spherical surface | Infinite number of cases | 0.30 | 1.51 | 64.1 |
| S17 | Spherical surface | Infinite number of cases | 1.52 | ||
| S18 | Spherical surface | Infinite number of cases | 0.50 | 1.51 | 64.1 |
| S19 | Spherical surface | Infinite number of cases | 0.39 |
The specific positions of the surface serial numbers in the table are shown in the figure 1, and the relevant parameters of the aspheric surfaces corresponding to the surface serial numbers in the table are shown in the following table:
the surface numbers in the two tables are shown in figure 1.
A first lens 1 using the above parameters; a first lens II 11; a first lens III 12; a second lens 2; a third lens 3; the data obtained for the fourth lens 4 and the fifth lens 5 are as follows:
the lens adopting the data can obtain the following results, and the specific results are shown in fig. 2 and appendage 3; as can be seen from the figures 2 and 3, the axial chromatic aberration of RGB of the lens is well corrected, clear imaging can be realized, meanwhile, the T line and the S line can be well converged, the field curvature and the astigmatism are very excellent, and the requirement of uniform imaging of the whole picture is ensured.
Example two
The present embodiment is basically the same in structure and principle as the first embodiment, except that: as shown in fig. 4, the first lens group includes a first lens 1 near the object plane and a second lens 11 located inside the first lens 1, two mirror surfaces of the first lens 1 are spherical surfaces, two mirror surfaces of the second lens 11 are aspheric surfaces, and the first lens 1 is a meniscus lens and is bent towards the image plane 9.
In the second embodiment, the refractive index n of the first lens 1 is set d Abbe constant V of the third lens 3 =1.95 d ＝81.6；
The optical structure parameters are provided in the following table:
the specific positions of the surface serial numbers in the table are shown in fig. 4, and the relevant parameters of the aspheric surfaces corresponding to the surface serial numbers in the table are shown in the following table:
a first lens 1 using the above parameters; a first lens II 11; a second lens 2; a third lens 3; the data obtained for the fourth lens 4 and the fifth lens 5 are as follows:
the lens adopting the data can obtain the following results, and the specific results are shown in fig. 5 and an appendage 6; as can be seen from the figures 5 and 6, the axial chromatic aberration of RGB of the lens is well corrected, clear imaging can be realized, meanwhile, the T line and the S line can be well converged, the field curvature and the astigmatism are very excellent, and the requirement of uniform imaging of the whole picture is ensured.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The lens of the vehicle-mounted ADAS panoramic camera is characterized in that the lens sequentially extends from an object plane to an image planeThe lens consists of a first lens group with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power, wherein a diaphragm is arranged between the second lens and the third lens; the first lens group consists of a first lens I with negative focal power, which is close to the object plane, and a first lens II with negative focal power, which is positioned on the inner side of the first lens I, wherein two mirror surfaces of the first lens I are spherical surfaces, and two mirror surfaces of the first lens II are aspheric surfaces; or the first lens group consists of a first lens I with negative focal power, a first lens II with negative focal power, which is positioned at the inner side of the first lens I, and a first lens III with negative focal power, wherein the two mirror surfaces of the first lens I are spherical surfaces, the two mirror surfaces of the first lens II are aspheric surfaces, and the two mirror surfaces of the first lens III are aspheric surfaces; the focal length of the first lens group is f 1 ，f 1 The method meets the following conditions: -1.8mm < f 1 -0.8mm; the first lens has a light refractive index n d The method meets the following conditions: n is more than 1.87 and less than 1 d < 2.00; the focal length of the second lens is f 2 The focal length of the third lens is f 3 ，f 2 And f 3 The method meets the following conditions:the focal length of the fourth lens is f 4 The focal length of the fifth lens is f 5 ，f 4 And f 5 The method meets the following conditions: />The front jade diameter of the lens is D 1 The total length of the lens is L, D 1 And L satisfies: />
2. The lens of the on-vehicle ADAS panoramic camera according to claim 1, wherein an optical filter and a protective glass are sequentially arranged between the fifth lens and the image plane.
3. The lens of the on-board ADAS panoramic camera of claim 1, wherein the first lens is a meniscus lens and the convex surface is facing the object.
4. The lens of the on-board ADAS panoramic camera of claim 1, wherein the abbe constant V of the third lens d The method meets the following conditions: 81.5 < V d ＜95.1。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810047491.3A CN108107556B (en) | 2018-01-18 | 2018-01-18 | Lens of vehicle-mounted ADAS panoramic camera |
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| CN201810047491.3A CN108107556B (en) | 2018-01-18 | 2018-01-18 | Lens of vehicle-mounted ADAS panoramic camera |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438236U (en) * | 2007-10-05 | 2010-04-14 | 富士能株式会社 | Camera shooting lens and camera shooting device |
| CN203773132U (en) * | 2011-09-29 | 2014-08-13 | 富士胶片株式会社 | Imaging lens and imaging device |
| CN105974561A (en) * | 2016-07-08 | 2016-09-28 | 浙江舜宇光学有限公司 | Wide-angle image photographing lens |
| CN107203029A (en) * | 2016-03-17 | 2017-09-26 | 先进光电科技股份有限公司 | Optical imaging system |
-
2018
- 2018-01-18 CN CN201810047491.3A patent/CN108107556B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438236U (en) * | 2007-10-05 | 2010-04-14 | 富士能株式会社 | Camera shooting lens and camera shooting device |
| CN203773132U (en) * | 2011-09-29 | 2014-08-13 | 富士胶片株式会社 | Imaging lens and imaging device |
| CN107203029A (en) * | 2016-03-17 | 2017-09-26 | 先进光电科技股份有限公司 | Optical imaging system |
| CN105974561A (en) * | 2016-07-08 | 2016-09-28 | 浙江舜宇光学有限公司 | Wide-angle image photographing lens |
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