CN109633863B - Vehicle-mounted front-view high-definition lens with focal length of 5.47mm and imaging method thereof - Google Patents
Vehicle-mounted front-view high-definition lens with focal length of 5.47mm and imaging method thereof Download PDFInfo
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- CN109633863B CN109633863B CN201811623581.9A CN201811623581A CN109633863B CN 109633863 B CN109633863 B CN 109633863B CN 201811623581 A CN201811623581 A CN 201811623581A CN 109633863 B CN109633863 B CN 109633863B
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
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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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Abstract
The invention relates to a vehicle-mounted front-view high-definition lens with a focal length of 5.47mm and an imaging method thereof, wherein the vehicle-mounted front-view high-definition lens comprises a main lens barrel and an optical system arranged in the main lens barrel, the optical system comprises a front group lens A with negative focal power, a diaphragm C and a rear group lens B with positive focal power, the front group lens A comprises a biconcave lens A-1 and a biconvex lens A-2, the biconcave lens A-1 and the biconvex lens A-2 are sequentially arranged from front to back, and the rear group lens B comprises a bonding group, a meniscus negative lens B-3 and a meniscus positive lens B-4, which are sequentially arranged from front to back and are tightly connected by the biconcave lens B-1 and the biconvex lens B-2. The invention has reasonable structure, long focal length, high resolution, simple optical structure, economical material price and the like, and can be matched with CCD or CMOS with high resolution of 200 ten thousand pixels.
Description
Technical field:
the invention relates to a vehicle-mounted front-view high-definition lens with a focal length of 5.47mm and an imaging method thereof.
The background technology is as follows:
the intelligent trend of automobiles is approaching, and the ADAS industry prospect is wide. Intelligence will be an important direction for future development of automobiles. China is gradually increasing in market size and industry development water. Development of ADAS series products will become a development trend of the vehicle industry.
The invention comprises the following steps:
the invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide an economical vehicle-mounted front-view high-definition lens with high resolution and high image quality and a 5.47mm focal length and an imaging method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a on-vehicle front view high definition lens of 5.47mm focus, includes main lens cone and the optical system of setting in main lens cone, optical system includes that the focal power that sets gradually is negative front group lens A, diaphragm C and focal power that follow light from front to back incident direction are positive back group lens B, front group lens A includes biconcave lens A-1 and biconvex lens A-2 that set gradually from front to back, back group lens B includes from front to back the veneer group, meniscus negative lens B-3 and meniscus positive lens B-4 that set gradually by biconcave lens B-1 and biconvex lens B-2 close.
Further, the air gap between the front group lens a and the rear group lens B is 2.66mm.
Further, the air interval between the biconcave lens A-1 and the biconvex lens A-2 in the front group lens A is 1.96mm; the air interval between the bonding group closely connected by the biconcave lens B-1 and the biconvex lens B-2 and the meniscus negative lens B-3 in the rear group lens B is 0.1mm, and the air interval between the meniscus negative lens B-3 and the meniscus positive lens B-4 is 0.1.
Further, a light filter is arranged behind the meniscus positive lens B-4.
Further, a front pressing ring for pressing the biconcave lens A-1 is arranged at the front end of the main lens barrel, a first spacing ring is arranged between the biconcave lens A-1 and the biconvex lens A-2, a second spacing ring is arranged between the biconvex lens A-2 and the gluing group, a third spacing ring is arranged between the gluing group and the meniscus negative lens B-3, and a fourth spacing ring is arranged between the meniscus negative lens B-3 and the meniscus positive lens B-4; the rear end of the main lens barrel is provided with an annular flange for supporting the meniscus positive lens B-4.
The invention adopts another technical scheme that: the imaging method of the vehicle-mounted front-view high-definition lens with the focal length of 5.47mm adopts the vehicle-mounted front-view high-definition lens with the focal length of 5.47mm, and when the vehicle-mounted front-view high-definition lens works, an optical path sequentially enters a front group of lenses A, a diaphragm C and a rear group of lenses B for imaging.
Compared with the prior art, the invention has the following effects:
(1) The total length of the light path is short, so that the size of the lens is small; the back focus is moderate, and can be matched with a camera of a trigger interface for use;
(2) The light-transmitting aperture is large, the light inlet quantity is sufficient, and the light-transmitting aperture can be used in a dim environment;
(3) The front lens group A is of negative focal power, the rear lens group B is of positive focal power, and the combination of the front lens group A and the rear lens group B can ensure that the lens can still be normally used in a high-low temperature environment;
(4) The high-resolution and high-image quality are realized by using high-refraction and low-dispersion flint glass and high-refraction and high-dispersion crown glass to achromatize and eliminate astigmatism;
(5) The lens is global, the R value is moderate, the lens assembly difficulty is reduced, low-price glass is used, the processing and material cost is reduced, and the optical sensitivity of the lens is reduced.
Description of the drawings:
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a schematic view of the construction of an embodiment of the present invention;
fig. 3 is an MTF plot focused such that the visible center field of view image quality is optimal.
In the figure:
1-a front pressing ring; 2-a main barrel; 3-a first spacer ring; 4-a second spacer; 5-a third spacer ring; 7-fourth space rings; 8-an annular flange; a-front group lens A; a-1: biconcave lens A-1; a-2: a lenticular lens A-2; b-rear group lens B; b-1: biconcave lens B-1; b-2: a lenticular lens B-2; b-3: a meniscus negative lens B-3; b-4: and a meniscus positive lens B-4.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1-2, the vehicle-mounted front-view high-definition lens with the focal length of 5.47mm comprises a main lens barrel 2 and an optical system arranged in the main lens barrel 2, wherein the optical system comprises a front group lens A with negative focal power, a diaphragm C and a rear group lens B with positive focal power, which are sequentially arranged along the incidence direction of light rays from front to back, the front group lens A comprises a biconcave lens A-1 and a biconvex lens A-2 which are sequentially arranged from front to back, and the rear group lens B comprises a bonding group, a meniscus negative lens B-3 and a meniscus positive lens B-4, which are sequentially arranged from front to back and are tightly connected by the biconcave lens B-1 and the biconvex lens B-2.
In this embodiment, the air gap between the front set of lenses a and the rear set of lenses B is 2.66mm.
In this embodiment, the air space between the biconcave lens A-1 and the biconvex lens A-2 in the front group lens A is 1.96mm; the air interval between the bonding group closely connected by the biconcave lens B-1 and the biconvex lens B-2 and the meniscus negative lens B-3 in the rear group lens B is 0.1mm, and the air interval between the meniscus negative lens B-3 and the meniscus positive lens B-4 is 0.1.
In this embodiment, an optical filter is disposed behind the positive meniscus lens B-4.
In this embodiment, the parameters of each lens are shown in the following table:
the optical system composed of the lenses achieves the following optical indexes:
focal length: f' =5.47 mm;
relative pore size f=1.6;
angle of view: 2w is more than or equal to 66 degrees (the image field of view 2 eta' is more than or equal to phi 6 mm);
distortion: 5.7% below;
resolution ratio: can be matched with a 200 ten thousand-pixel high-resolution CCD or CMOS camera;
the total length sigma of the light path is less than or equal to 19.9mm, and the optical back intercept L' is more than or equal to 2.9mm;
the applicable spectral line range: 420 nm-700 nm.
In this embodiment, the whole lens ensures the approximately proportional distribution of refractive index and focal power of the lens, and ensures the uniformity of the incident angles of the front and rear groups of lenses, so as to reduce the sensitivity of the lens and improve the possibility of production. Meanwhile, the reversibility of the focal power of the front lens and the rear lens is ensured so as to improve the use universality of the whole lens, and the specific scheme is as follows:
as can be seen from FIG. 3, the distance difference between the back focal planes of the visible light and the infrared light passing through the lens is very small, and the imaging requirements of two wave bands can be simultaneously met on the same image plane. When visible light is imaged, the center view field 120 line pair is greater than 0.5, and the edge view field 120 line pair is greater than 0.35.
In this embodiment, the lens has market advantages in the vehicle-mounted field, the front group of negative focal power corrects 3-order aberration and 5-order spherical aberration, the rear group of bonding sheets mainly corrects chromatic aberration and astigmatism by high-refractive-index low-dispersion flint glass and high-refractive-index high-dispersion crown glass, the focal power is reasonably distributed to reduce incidence angles of all surfaces, the high-definition shooting level is achieved with lower sensitivity, and when in optical design, the lens glass material is reasonably selected, so that the aberration of the lens in the wavelength range of 480-850 nm is reasonably corrected and balanced.
In this embodiment, the design of the mechanical structure needs to meet the requirements of the production and assembly process, the assembly size requirements of the customer, and the coaxiality, the effective clear aperture and the air space among the lenses in the optical path design.
In this embodiment, the front end of the main lens barrel 2 is provided with a front pressing ring 1 for pressing the biconcave lens A-1, and the rear end of the main lens barrel 2 is provided with an annular flange 7 for supporting the meniscus positive lens B-4.
In this embodiment, a first spacer ring 3 is disposed between the biconcave lens a-1 and the biconvex lens a-2, so as to ensure the air space between the biconcave lens a-1 and the biconvex lens a-2 and the assembly of the optical axes thereof, and intercept and absorb ineffective light rays at the same time, and the interior of the first spacer ring adopts an inner hook type design, so that the problem of stray light of the lens can be effectively solved.
In this embodiment, a second spacer ring 4 is disposed between the biconvex lens a-2 and the bonding set, so as to ensure the air space between the biconvex lens a-2 and the bonding set and the optical axis assembly thereof, and intercept and absorb ineffective light, and the second spacer ring can effectively solve the problem of stray light of the lens by controlling the size of the inner hole at the position of the diaphragm through adopting a stepped inner hook design, so that the clear aperture of the lens can be ensured.
In this embodiment, a third spacer ring 5 is disposed between the bonding set and the negative meniscus lens B-3, so as to ensure the air space between the bonding set and the negative meniscus lens B-3 and the assembly of the optical axis thereof, and intercept and absorb ineffective light, and the stepped inclined surface design is adopted in the third spacer ring, so that the problem of stray light of the lens can be effectively solved, the front and back sides can be conveniently distinguished, and the reverse assembly of the spacer ring is prevented.
In this embodiment, the fourth spacer ring 6 is disposed between the negative meniscus lens B-3 and the positive meniscus lens B-4, so as to ensure the air space between the negative meniscus lens B-3 and the positive meniscus lens B-4 and the assembly of the optical axes thereof, and intercept and absorb the ineffective light, and the interior of the fourth spacer ring adopts an inner hook design to effectively solve the problem of stray light of the lens.
In this embodiment, the lens barrel is made of metal as a sleeve for carrying the lens and the spacer ring, and the metal lens barrel is firm and durable, and has better strength and wear resistance. The straight cylinder type lens barrel is adopted to ensure coaxiality, is an important factor for ensuring imaging quality, and ensures consistency of optical axes of lenses. The lens barrel adopts an interface mode of M10X0.5-4h to match the use requirement of a client camera.
The invention adopts another technical scheme that: the imaging method of the vehicle-mounted front-view high-definition lens with the focal length of 5.47mm adopts the vehicle-mounted front-view high-definition lens with the focal length of 5.47mm, and when the vehicle-mounted front-view high-definition lens works, an optical path sequentially enters a front group of lenses A, a diaphragm C and a rear group of lenses B for imaging.
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 (4)
1. A5.47 mm focal length vehicle-mounted front-view high-definition lens is characterized in that: the lens comprises a main lens barrel and an optical system arranged in the main lens barrel, wherein the optical system comprises a front group lens A, a diaphragm C and a rear group lens B, wherein the front group lens A, the diaphragm C and the rear group lens B are sequentially arranged along the incidence direction of light rays from front to back, the optical power is negative, the front group lens A comprises a biconcave lens A-1 and a biconvex lens A-2 which are sequentially arranged from front to back, and the rear group lens B comprises a gluing group, a meniscus negative lens B-3 and a meniscus positive lens B-4, which are sequentially arranged from front to back and are tightly connected by the biconcave lens B-1 and the biconvex lens B-2;
the air space between the front group of lenses A and the rear group of lenses B is 2.66mm;
the air interval between the biconcave lens A-1 and the biconvex lens A-2 in the front group lens A is 1.96mm; the air interval between the bonding group closely connected by the biconcave lens B-1 and the biconvex lens B-2 and the meniscus negative lens B-3 in the rear group lens B is 0.1mm, and the air interval between the meniscus negative lens B-3 and the meniscus positive lens B-4 is 0.1;
focal length of optical system: f' =3.24 mm; relative pore size f=2.2; angle of view: 2w is more than or equal to 140 degrees, and the image field of view 2 eta' is more than or equal to phi 6.6mm; distortion: -15.6%; resolution ratio: can be matched with a 200 ten thousand-pixel high-resolution CCD or CMOS camera; the total length sigma of the light path is less than or equal to 17.5mm, and the optical back intercept L' is more than or equal to 5.5mm; the applicable spectral line range: 420 nm-700 nm;
the parameters for each lens are shown in the following table:
。
2. the 5.47mm focal length vehicular forward looking high definition lens of claim 1, wherein: and an optical filter is arranged behind the meniscus positive lens B-4.
3. The 5.47mm focal length vehicular forward looking high definition lens of claim 1, wherein: the front end of the main lens barrel is provided with a front pressing ring used for pressing the biconcave lens A-1, a first spacing ring is arranged between the biconcave lens A-1 and the biconvex lens A-2, a second spacing ring is arranged between the biconvex lens A-2 and the gluing group, a third spacing ring is arranged between the gluing group and the meniscus negative lens B-3, and a fourth spacing ring is arranged between the meniscus negative lens B-3 and the meniscus positive lens B-4; the rear end of the main lens barrel is provided with an annular flange for supporting the meniscus positive lens B-4.
4. An imaging method of a vehicle-mounted front-view high-definition lens with a focal length of 5.47mm is characterized by comprising the following steps: a 5.47mm focal length vehicle-mounted front-view high definition lens as claimed in any one of claims 1 to 3, wherein in operation, the optical path sequentially enters the front group lens a, the diaphragm C and the rear group lens B for imaging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811623581.9A CN109633863B (en) | 2018-12-28 | 2018-12-28 | Vehicle-mounted front-view high-definition lens with focal length of 5.47mm and imaging method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811623581.9A CN109633863B (en) | 2018-12-28 | 2018-12-28 | Vehicle-mounted front-view high-definition lens with focal length of 5.47mm and imaging method thereof |
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| CN109633863A CN109633863A (en) | 2019-04-16 |
| CN109633863B true CN109633863B (en) | 2023-07-21 |
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| CN110646920B (en) * | 2019-09-17 | 2023-10-27 | 福建福光天瞳光学有限公司 | Long-focal-length vehicle-mounted optical lens and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991762A (en) * | 2017-12-12 | 2018-05-04 | 福建福光股份有限公司 | A kind of 1.3mm focal lengths panorama day and night confocal high definition camera lens |
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| CN107991762A (en) * | 2017-12-12 | 2018-05-04 | 福建福光股份有限公司 | A kind of 1.3mm focal lengths panorama day and night confocal high definition camera lens |
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