CN108020909B - 2.8mm focal length high definition super wide angle vehicle-mounted lens - Google Patents
2.8mm focal length high definition super wide angle vehicle-mounted lens Download PDFInfo
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- CN108020909B CN108020909B CN201711320071.XA CN201711320071A CN108020909B CN 108020909 B CN108020909 B CN 108020909B CN 201711320071 A CN201711320071 A CN 201711320071A CN 108020909 B CN108020909 B CN 108020909B
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- G—PHYSICS
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- 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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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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Abstract
The invention relates to a 2.8mm focal length high-definition super-wide-angle vehicle-mounted lens, wherein an optical system of the lens comprises a front group lens A with negative focal power, a diaphragm, a rear group lens B with positive focal power and an optical filter, which are sequentially arranged along the incident direction of light rays from front to back, the front group lens A comprises a negative meniscus lens A-1, a biconcave lens A-2 and a biconvex lens A-3, which are sequentially arranged from front to back, the rear group lens B comprises a positive meniscus lens B-1, a biconvex lens B-2 and a negative meniscus lens B-3, which are sequentially arranged from front to back, and the air interval between the front group lens A and the rear group lens B is 1.6 mm. The lens has the advantages of simple structure, reasonable design, 130-degree horizontal view field, total TTL length smaller than 16mm, 2.0 large aperture, three million-level high-definition pixels, good day and night imaging effect, capability of being simultaneously adapted to vehicle-mounted cmos imaging chips of 0-degree CRA and 25-degree CRA without generating color cast and dark angle phenomena, good lens manufacturability and low manufacturing cost.
Description
Technical Field
The invention relates to a 2.8mm high-definition super-wide-angle vehicle-mounted mirror.
Background
At present, vehicle-mounted driving record monitoring plays an important role in driving safety and traffic disputes, the horizontal field of view of the vehicle-mounted lens in the market is generally between 90 and 120 degrees, and the imaging performance at night is poor; in addition, the lens process difficulty is increased due to the overlarge view field angle of the lens, and the cost of the lens is high. The existing multilane monitoring has higher requirements on a horizontal view field, objects such as license plates and the like which are farther away are identified, the higher requirements on pixels are provided, the improvement of the night vision effect is met by a larger aperture, and the industry trend is to have higher performance and reduce the cost.
Disclosure of Invention
In view of this, the invention aims to provide a 2.8mm focal length high-definition super-wide-angle vehicle-mounted lens with small volume and large horizontal field angle.
The invention is realized by adopting the following scheme: a2.8 mm focal length high-definition super-wide-angle vehicle-mounted lens is characterized in that an optical system of the lens comprises a front group lens A with negative focal power, a diaphragm, a rear group lens B with positive focal power and an optical filter, wherein the front group lens A, the diaphragm, the rear group lens B and the optical filter are sequentially arranged along the incident direction of light from front to back, the front group lens A comprises a negative meniscus lens A-1, a biconcave lens A-2 and a biconvex lens A-3, the rear group lens B comprises a positive meniscus lens B-1, a biconvex lens B-2 and a negative meniscus lens B-3 which are sequentially arranged from front to back, the adhesive combination is tightly connected, and the air interval between the front group lens A and the rear group lens B is 1.6 mm.
Furthermore, the refractive index Nd of the biconcave lens A-2 is more than or equal to 1.45, and the Abbe constant Vd is more than or equal to 60; the refractive index Nd of the positive meniscus lens B-1 is more than or equal to 1.7, and the Abbe constant Vd is more than or equal to 40; the refractive index Nd of the negative meniscus lens B-3 is more than or equal to 1.8, and the Abbe constant Vd is less than or equal to 25.
Further, the focal length F1 of the negative meniscus lens A-1 satisfies the following relation: F1/F is more than or equal to-3 and less than or equal to-1.5; the focal length value F56 of the cemented combination consisting of the biconvex lens B-2 and the negative meniscus lens B-3 satisfies the following relational expression: F56/F is more than or equal to 2 and less than or equal to 4, wherein F is the total focal length value of the lens; the focal length of the front group of lenses A is 13.56mm, and the focal length of the rear group of lenses B is 4.84 mm.
Further, the air space between the negative meniscus lens A-1 and the double convex lens A-2 is 2.1mm, and the air space between the double concave lens A-2 and the double convex lens A-3 is 0.3 mm; the air space between the positive meniscus lens B-1 and the cemented group is 0.1 mm; the air space between the bonding group and the optical filter is 4.5mm, and the object side surface of the negative meniscus lens A-1 is plated with a waterproof film.
Further, the curvature radius R1 of the front mirror surface of the negative meniscus lens A-1 satisfies the relation: 30mm < R1<40mm, the radius of curvature R2 of the rear mirror surface satisfies the relation 2.5mm < R2<3mm, and the thickness is 0.7 mm; the curvature radius R3 of the front mirror surface of the biconcave lens A-2 satisfies the relation: -30mm < R3< -20mm, the radius of curvature R4 of the rear mirror surface satisfying the relation 3mm < R4<4mm, and the thickness being 1.5 mm; the curvature radius R5 of the front mirror surface of the biconvex lens A-3 satisfies the relation: 4mm < R5<6mm, the curvature radius R6 of the rear mirror surface satisfies the relation-20 mm < R6< -15mm, and the thickness is 2 mm; the radius of curvature R7 of the front mirror surface of the positive meniscus lens B-1 satisfies the relation: -20mm < R7< -15mm, the radius of curvature R8 of the rear mirror surface satisfying the relation: -6mm < R < -4mm, thickness 1.5 mm; the curvature radius R9 of the front glued mirror meets the relation: 10mm < R9<15mm, the curvature radius R10 of the gluing surface satisfies the relation-4 mm < R10< -2.5mm, and the curvature radius R11 of the rear mirror surface satisfies the relation: -10mm < R < -6mm, the thickness of the lenticular lens B-2 is 2.0mm, and the thickness of the negative meniscus lens B-3 is 0.7 mm.
Compared with the prior art, the invention has the following beneficial effects: the 2.8mm focal length high-definition super-wide-angle vehicle-mounted lens has the advantages of simple structure, reasonable design, 130 degree of horizontal field of view, total TTL length smaller than 16mm, 2.0 large aperture, three million-level high-definition pixels, good day and night imaging effects, capability of being simultaneously adapted to vehicle-mounted cmos imaging chips of 0-degree CRA and 25-degree CRA, no color cast and dark angle phenomena, good lens manufacturability and low manufacturing cost.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a view showing the structure of an optical system of a lens barrel according to the present invention;
FIG. 2 is an MTF image quality evaluation curve of the vehicle-mounted lens;
FIG. 3 is a low temperature-40 ℃ defocus MTF curve of the vehicle lens;
fig. 4 is a high temperature +85 ℃ defocus MTF curve of the vehicle-mounted lens.
The reference numbers in the figures illustrate: 1-negative meniscus lens A-1, 2-biconcave lens A-2, 3-biconvex lens A-3, 4-diaphragm, 5-positive meniscus lens B-1, 6-biconvex lens B-2, 7-negative meniscus lens B-3, and 8-optical filter.
Detailed Description
As shown in fig. 1, an optical system of the 2.8mm focal length high-definition super-wide-angle vehicle-mounted lens comprises a front group lens a with negative focal power, a diaphragm, a rear group lens B with positive focal power and an optical filter, wherein the front group lens a, the diaphragm, the rear group lens B with positive focal power and the optical filter are sequentially arranged along a light incidence direction from front to back, the front group lens a comprises a negative meniscus lens a-1, a biconcave lens a-2 and a biconvex lens a-3, the rear group lens B comprises a positive meniscus lens B-1, a biconvex lens B-2 and a negative meniscus lens B-3, which are sequentially arranged from front to back, and an air interval between the front group lens a and the rear group lens B is 1.6 mm.
In the embodiment, the refractive index Nd of the biconcave lens A-2 is more than or equal to 1.45, and the Abbe constant Vd is more than or equal to 60; the refractive index Nd of the positive meniscus lens B-1 is more than or equal to 1.7, and the Abbe constant Vd is more than or equal to 40; the refractive index Nd of the negative meniscus lens B-3 is more than or equal to 1.8, and the Abbe constant Vd is less than or equal to 25.
In the present embodiment, the focal length F1 of the negative meniscus lens A-1 satisfies the following relationship: F1/F is more than or equal to-3 and less than or equal to-1.5; the focal length value F56 of the cemented combination consisting of the biconvex lens B-2 and the negative meniscus lens B-3 satisfies the following relational expression: F56/F is more than or equal to 2 and less than or equal to 4, wherein F is the total focal length value of the lens; the focal length of the front group of lenses A is 13.56mm, and the focal length of the rear group of lenses B is 4.84 mm.
In the present embodiment, the air space between the negative meniscus lens a-1 and the double convex lens a-2 is 2.1mm, and the air space between the double concave lens a-2 and the double convex lens a-3 is 0.3 mm; the air space between the positive meniscus lens B-1 and the cemented group is 0.1 mm; the air space between the bonding group and the optical filter is 4.5mm, and the object side surface of the negative meniscus lens A-1 is plated with a waterproof film.
In the embodiment, the horizontal field angle of the lens is larger than 130 degrees, the total optical length TTL is smaller than 16mm, and the lens has a large aperture of 2.0.
In this embodiment, the radius of curvature R1 of the front mirror surface of the negative meniscus lens A-1 satisfies the relationship: 30mm < R1<40mm, the radius of curvature R2 of the rear mirror surface satisfies the relation 2.5mm < R2<3mm, and the thickness is 0.7 mm; the curvature radius R3 of the front mirror surface of the biconcave lens A-2 satisfies the relation: -30mm < R3< -20mm, the radius of curvature R4 of the rear mirror surface satisfying the relation 3mm < R4<4mm, and the thickness being 1.5 mm; the curvature radius R5 of the front mirror surface of the biconvex lens A-3 satisfies the relation: 4mm < R5<6mm, the curvature radius R6 of the rear mirror surface satisfies the relation-20 mm < R6< -15mm, and the thickness is 2 mm; the radius of curvature R7 of the front mirror surface of the positive meniscus lens B-1 satisfies the relation: -20mm < R7< -15mm, the radius of curvature R8 of the rear mirror surface satisfying the relation: -6mm < R < -4mm, thickness 1.5 mm; the curvature radius R9 of the front glued mirror meets the relation: 10mm < R9<15mm, the curvature radius R10 of the gluing surface satisfies the relation-4 mm < R10< -2.5mm, and the curvature radius R11 of the rear mirror surface satisfies the relation: -10mm < R < -6mm, the thickness of the lenticular lens B-2 is 2.0mm, and the thickness of the negative meniscus lens B-3 is 0.7 mm.
In this embodiment, the negative meniscus lens A-1 is made of barium crown, the biconvex lens A-3 is made of heavy lanthanum flint, the positive meniscus lens B-1 is made of lanthanum flint, the biconvex lens B-2 is made of lanthanum crown, and the negative meniscus lens B-3 is made of heavy flint.
The optical structure formed by the lens group achieves the following optical indexes:
focal length: f' =2.8 mm;
F=2.0；
the field angle: the horizontal 2w is more than or equal to 130 degrees (the diagonal 2w is more than or equal to 160 degrees, and the image viewing field 2 eta' is more than or equal to phi 6.6 mm);
incident angle of principal ray: CRA <15 °;
distortion of TV: less than-19 percent;
resolution ratio: the device can be matched with an 1/3 inch 300 ten thousand pixel vehicle-mounted CMOS imaging chip;
the total length sigma of the optical path is less than or equal to 16mm, and the optical back intercept L' is more than or equal to 4.5 mm;
applicable spectral line range: 480 nm-656 nm.
In this embodiment, the lens adopts a fisheye-like structure, the two negatives in the front group are used for reducing incident light rays with a large angle of view, and the material with low refractive index and low dispersion is favorable for correcting the field curvature and the chromatic aberration of magnification of the system. The rear group of the gluing sheets are composed of ZF glass with high refractive index and high dispersion and an LAK glass group with higher refractive index and low dispersion, the gluing surfaces are bent to the diaphragm surface, chromatic aberration and high-grade off-axis spherical aberration are mainly corrected, the whole lens is reasonably distributed through refractive index and focal power, and the reasonable incident angle and deflection angle of each lens are guaranteed, so that the sensitivity of the lens is reduced, and the production yield is improved.
Fig. 2 is an MTF image quality evaluation curve of the vehicle-mounted lens, the environment is at a normal temperature of 20 ℃, the visible light working band is adopted, the MTF reaches 0.6 in the central view field and 0.5 in the 0.7 view field at a spatial frequency of 120lp/mm, and the requirement of three million high-definition resolving power can be met.
FIGS. 3 and 4 are defocusing MTF curves of the vehicle-mounted lens in the low-temperature environment of minus 40 ℃ and the high-temperature environment of plus 85 ℃, respectively, wherein at a spatial frequency of 120lp/mm, the defocusing amount at the low temperature is 7 μm, the defocusing amount at the high temperature is 6 μm, the MTF of the central view field is above 0.5, and the image quality performance at the high and low temperatures completely meets the environmental use requirements of the vehicle-mounted lens.
The lens has the advantages that:
a) according to the completed technical indexes, the total length of the light path is short, and the size of the lens is small; the rear focus is large, which is beneficial to the installation of the vehicle-mounted camera system;
b) the horizontal field angle of the lens is large, so that the real-time shooting of multiple lanes can be met;
c) the maximum lens CRA15 degrees can be simultaneously adapted to the vehicle-mounted cmos imaging chips of 0-degree CRA and 25-degree CRA, and the phenomena of color cast and dark angle cannot be generated;
d) the front group negative film adopts glass with low refractive index and high Abbe number to better correct the field curvature and the magnification chromatic aberration of the system;
e) the rear group of the laminated sheets are made of ZF glass with high refractive index and high dispersion and LAK glass with higher refractive index and low dispersion, so that the excellent achromatization and the off-axis high-grade spherical aberration are realized;
f) all lenses of the vehicle-mounted lens are spherical glass, the manufacturability is excellent, the lens assembly difficulty is reduced, low-price glass is used, the processing and material cost is reduced, and meanwhile, the tolerance sensitivity of the lens is reduced.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a 2.8mm focus high definition super wide angle vehicle-mounted lens which characterized in that: the optical system of the lens comprises a front group lens A with negative focal power, a diaphragm, a rear group lens B with positive focal power and an optical filter, wherein the front group lens A, the diaphragm, the rear group lens B with positive focal power and the optical filter are sequentially arranged along the incident direction of light rays from front to back, the front group lens A comprises a negative meniscus lens A-1, a biconcave lens A-2 and a biconvex lens A-3 which are sequentially arranged from front to back, the rear group lens B comprises a positive meniscus lens B-1, a biconvex lens B-2 and a gluing group which is tightly connected with the negative meniscus lens B-3 which are sequentially arranged from front to back, and the air interval between the front group lens A and the rear group lens B is 1.6 mm; the refractive index Nd of the biconcave lens A-2 is more than or equal to 1.45, and the Abbe constant Vd is more than or equal to 60; the refractive index Nd of the positive meniscus lens B-1 is more than or equal to 1.7, and the Abbe constant Vd is more than or equal to 40; the refractive index Nd of the negative meniscus lens B-3 is more than or equal to 1.8, and the Abbe constant Vd is less than or equal to 25; the focal length F1 of the negative meniscus lens A-1 satisfies the following relation: F1/F is more than or equal to-3 and less than or equal to-1.5; the focal length value F56 of the cemented combination consisting of the biconvex lens B-2 and the negative meniscus lens B-3 satisfies the following relational expression: F56/F is more than or equal to 2 and less than or equal to 4, wherein F is the total focal length value of the lens; the focal length of the front group of lenses A is 13.56mm, and the focal length of the rear group of lenses B is 4.84 mm; the air space between the negative meniscus lens A-1 and the biconvex lens A-2 is 2.1mm, and the air space between the biconcave lens A-2 and the biconvex lens A-3 is 0.3 mm; the air space between the positive meniscus lens B-1 and the cemented group is 0.1 mm; the air space between the bonding group and the optical filter is 4.5mm, and the object side surface of the negative meniscus lens A-1 is plated with a waterproof film; the curvature radius R1 of the front mirror surface of the negative meniscus lens A-1 satisfies the relation: 30mm < R1<40mm, the radius of curvature R2 of the rear mirror surface satisfies the relation 2.5mm < R2<3mm, and the thickness is 0.7 mm; the curvature radius R3 of the front mirror surface of the biconcave lens A-2 satisfies the relation: -30mm < R3< -20mm, the radius of curvature R4 of the rear mirror surface satisfying the relation 3mm < R4<4mm, and the thickness being 1.5 mm; the curvature radius R5 of the front mirror surface of the biconvex lens A-3 satisfies the relation: 4mm < R5<6mm, the curvature radius R6 of the rear mirror surface satisfies the relation-20 mm < R6< -15mm, and the thickness is 2 mm; the radius of curvature R7 of the front mirror surface of the positive meniscus lens B-1 satisfies the relation: -20mm < R7< -15mm, the radius of curvature R8 of the rear mirror surface satisfying the relation: -6mm < R < -4mm, thickness 1.5 mm; the curvature radius R9 of the front glued mirror meets the relation: 10mm < R9<15mm, the curvature radius R10 of the gluing surface satisfies the relation-4 mm < R10< -2.5mm, and the curvature radius R11 of the rear mirror surface satisfies the relation: -10mm < R < -6mm, the thickness of the lenticular lens B-2 is 2.0mm, and the thickness of the negative meniscus lens B-3 is 0.7 mm.
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| CN201711320071.XA CN108020909B (en) | 2017-12-12 | 2017-12-12 | 2.8mm focal length high definition super wide angle vehicle-mounted lens |
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Families Citing this family (7)
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| CN108594406A (en) * | 2018-06-09 | 2018-09-28 | 福建福光股份有限公司 | A kind of high definition of 2.8mm day and night confocal camera lens |
| CN109116522B (en) * | 2018-11-12 | 2024-04-23 | 浙江舜宇光学有限公司 | Image pickup lens |
| CN109459838B (en) * | 2018-12-28 | 2024-05-10 | 福建福光天瞳光学有限公司 | Wide-angle high-resolution vehicle-mounted optical system and imaging method |
| 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 |
| CN110488460A (en) * | 2019-08-14 | 2019-11-22 | 福建福光天瞳光学有限公司 | A kind of 2.82mm focal length Streaming Media intelligent back vision camera lens and its imaging method |
| CN110806633A (en) * | 2019-11-26 | 2020-02-18 | 福建福光天瞳光学有限公司 | 1.4mm wide-angle optical system and imaging method thereof |
| CN110955031B (en) * | 2019-12-23 | 2023-11-10 | 福建福光天瞳光学有限公司 | 2.8mm wide-angle optical system and imaging method thereof |
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| JP6537331B2 (en) * | 2015-04-13 | 2019-07-03 | キヤノン株式会社 | Optical system and imaging apparatus having the same |
| JP6646262B2 (en) * | 2016-04-12 | 2020-02-14 | キヤノン株式会社 | Optical system and imaging apparatus having the same |
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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 |
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