CN107436483B - 1.7mm ultra-wide-angle rear-view vehicle-mounted lens - Google Patents
1.7mm ultra-wide-angle rear-view vehicle-mounted lens Download PDFInfo
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- CN107436483B CN107436483B CN201710578816.6A CN201710578816A CN107436483B CN 107436483 B CN107436483 B CN 107436483B CN 201710578816 A CN201710578816 A CN 201710578816A CN 107436483 B CN107436483 B CN 107436483B
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
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Abstract
The invention relates to a 1.7mm ultra-wide-angle rearview vehicle-mounted lens, which comprises a lens body and a lens barrelThe optical lens comprises a front lens group A with negative focal power, a diaphragm C, a rear lens group B with positive focal power and an optical filter D, wherein the front lens group A consists of a negative meniscus lens A-1 and a positive meniscus thick lens A-2, the rear lens group B consists of a bonding group formed by tightly connecting a plano-convex lens B-1, a double convex lens B-2 and a negative meniscus lens B-3, the air interval between the front lens group A and the rear lens group B is 2.3mm, and the focal length f of the front lens group A is 2.3mmA= 7.08mm, focal length f of rear group lens BBThe vehicle-mounted high-definition super-wide-angle lens has the advantages that the horizontal field of view reaches 130 degrees, the total length of TT L is less than 14mm, the imaging effect is good, the manufacturability is good, and the cost is low.
Description
Technical Field
The invention relates to a 1.7mm ultra-wide-angle rearview vehicle-mounted lens.
Background
At present, the vehicle-mounted lens is developing from a VGA standard definition to a million high-definition pixel trend, the requirement on the optical total length is shorter and shorter, the requirement on the visual field of the lens is larger and larger, the horizontal visual field of the rearview vehicle-mounted lens in the current market is generally below 120 degrees, the imaging performance is poorer, although the introduction of a plastic aspheric lens improves the image quality, the high-low temperature imaging performance of the lens is poor due to the poor thermal stability of optical plastic; in addition, the brightness of the picture of the vehicle-mounted lens containing the plastic aspheric surface is generally lower than that of the full-glass lens. For a vehicle-mounted lens with a horizontal 130-degree ultra-large view field and a short total length requirement, the design of global surface glass has high requirements on lens technology, the processing difficulty is high, and the acquisition of high-definition image quality is difficult.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a 1.7mm ultra-wide-angle rearview vehicle-mounted lens.
In order to solve the technical problems, the technical scheme of the invention is as follows: a1.7 mm ultra-wide-angle rearview vehicle-mounted lens comprises a front lens group A with negative focal power, a diaphragm C, a rear lens group B with positive focal power and an optical filter D, wherein the front lens group A, the diaphragm C, the rear lens group B with positive focal power and the optical filter D are sequentially arranged along the incident direction of light rays from left to right, the front lens group A consists of a negative meniscus lens A-1 and a positive meniscus thick lens A-2, the rear lens group B consists of a bonding group formed by tightly connecting a plano-convex lens B-1, a double convex lens B-2 and a negative meniscus lens B-3, and the air interval between the front lens group A and the rear lens group B is 2.3 mm.
Further, the focal length f of the front group of lenses AA= 7.08mm, focal length f of rear group lens BB=3.56mm。
Further, the air space between the negative meniscus lens A-1 and the positive meniscus thick lens A-2 is 1.3mm, and the air space between the plano-convex lens B-1 and the cemented group is 0.1 mm.
Further, the total optical length TT L of the lens is smaller than 14mm, and the horizontal visual field is larger than 130 degrees.
Furthermore, the object side surface of the negative meniscus lens A-1 is plated with a waterproof film.
Compared with the prior art, the high-definition super-wide-angle vehicle-mounted lens has the advantages of simple structure, reasonable design, good imaging effect, good manufacturability and low cost, the horizontal field of view reaches 130 degrees, and the total length of TT L is less than 14 mm.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is an optical block diagram of the present invention;
FIG. 2 is an MTF image quality evaluation curve of the vehicle-mounted lens;
FIG. 3 is a low temperature 30 ℃ defocus MTF curve of the vehicle lens;
fig. 4 is a high-temperature 70 ℃ defocus MTF curve of the on-vehicle lens.
In the figure:
a-front group lens A; a-1-negative meniscus lens A-1; a-2-positive meniscus thick lens A-2; b-rear group lens B; b-1-plano-convex lens B-1; b-2-biconvex lens B-2; b-3-negative meniscus lens B-3; c-diaphragm C; d-a filter D; and F-an image surface.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in figures 1-4, the 1.7mm ultra-wide-angle rearview vehicle-mounted lens adopts a reverse distance structure and comprises a front group lens A with negative focal power, a diaphragm C, a rear group lens B with positive focal power and an optical filter D which are sequentially arranged along the incident direction of light from left to right, wherein the front group lens A consists of a negative meniscus lens A-1 and a positive meniscus thick lens A-2, the rear group lens B consists of a bonding group formed by tightly connecting a plano-convex lens B-1, a biconvex lens B-2 and a negative meniscus lens B-3, and the air interval between the front group lens A and the rear group lens B is 2.3 mm.
In the present embodiment, the focal length f of the front lens group AA= 7.08mm, focal length f of rear group lens BB=3.56mm。
In this embodiment, the air space between the negative meniscus lens A-1 and the positive meniscus thick lens A-2 is 1.3mm, and the air space between the plano-convex lens B-1 and the cemented group is 0.1 mm.
In this embodiment, the object side of the negative meniscus lens a-1 is coated with a waterproof film.
In the present embodiment, the total optical length TT L of the lens is less than 14mm, and the horizontal field of view is greater than 130 °.
In this embodiment, the optical structure formed by the above lens assembly achieves the following optical indexes:
focal length: f' =1.7 mm;
relative pore size F = 2.0;
the field angle is that the horizontal 2w is more than or equal to 130 degrees (the diagonal 2w is more than or equal to 170 degrees, and the image field of view 2 η' is more than or equal to phi 4.5 mm);
incident angle of principal ray: CRA <5 °;
distortion: less than-90 percent;
resolution ratio: can be matched with 130 ten thousand pixel high-resolution CCD or CMOS chips;
the total length of the light path ∑ is not more than 14mm, and the optical back intercept L' is not less than 2.5 mm;
applicable spectral line range: 480 nm-656 nm.
The lens parameters were as follows:
in the present embodiment, in the optical design, aberration correction and balancing are performed on the visible light band 480-.
In this embodiment, the negative power of the front group corrects 3 th order aberration and 5 th order spherical aberration, the high refractive index material is used to reduce the bending of the lens and increase the light deflection capability, the rear group of adhesive sheet is mainly composed of high refractive index high dispersion heavy flint glass and high refractive index low dispersion lanthanum crown glass to correct chromatic aberration and high level spherical aberration, the negative power of the rear group of adhesive sheet close to the image plane is used to correct curvature of field by glass with larger refractive index, the whole lens ensures the approximate proportion distribution of the refractive index and the power of the lens, and ensures the uniformity of the incident angle of the front and rear group of lenses, so as to reduce the sensitivity of the lens and improve the production possibility.
FIG. 2 is an MTF image quality evaluation curve of the vehicle-mounted lens, the environment is normal temperature of 20 ℃, the visible light working waveband is adopted, the MTF reaches 0.6 in the central view field and 0.4 in the 0.7 view field at the spatial frequency of 90lp/mm, and the million-high-definition resolving power requirement is completely met.
Fig. 3 and 4 show the defocusing MTF curves of the vehicle-mounted lens in the low-temperature-30 ℃ and high-temperature-70 ℃ environments respectively, wherein at a spatial frequency of 90lp/mm, both the defocusing amount at low temperature and high temperature is 5 μm, the MTF reduction of the central field is not more than 0.1, the image quality performance in the high and low temperature environments is very excellent, and the environmental use requirements of the vehicle-mounted lens are completely met.
The lens has the advantages of "
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 lens CRA is small, can be well matched with a vehicle-mounted cmos chip of a 0-degree CRA, and cannot generate color cast and dark corner phenomena;
d) the front group of negative focal power and the rear group of positive focal power ensure the imaging stability in high and low temperature environments;
e) the high-refractivity and high-dispersion heavy flint glass and the high-refractivity and low-dispersion lanthanum crown glass are selected to form a cementing group, so that achromatism and off-axis high-grade spherical aberration can be 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 invention provides a 1.7mm ultra-wide-angle vehicle-mounted lens which adopts a design of 4 groups of 5 full-spherical lenses and has good manufacturability and low cost. The horizontal field of view of this on-vehicle camera lens reaches 130, possess 2.0 big light ring, imaging effect is good, the image quality reaches million high definition levels, even when at low light environment or night, also can guarantee the clarity of image, adopt anti-long distance structure, effectual correction 3 rank aberration and 5 rank spherical aberration, and use high refracting index low Abbe glass with the correction colour difference and big wide angle low light degree of buckling, reach high definition level of making a video recording with lower cost, be applicable to 1/4 inch's CCD or CMOS chip.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (2)
1. The utility model provides a 1.7mm super wide angle back vision vehicle-mounted lens which characterized in that: the optical filter comprises a front lens group A with negative focal power, a diaphragm C, a rear lens group B with positive focal power and an optical filter D, wherein the front lens group A, the diaphragm C, the rear lens group B with positive focal power and the optical filter D are sequentially arranged along the incident direction of light from left to right, the front lens group A consists of a negative meniscus lens A-1 and a positive meniscus lens A-2, the rear lens group B consists of a bonding group formed by tightly connecting a plano-convex lens B-1, a double convex lens B-2 and a negative meniscus lens B-3, the air interval between the front lens group A and the rear lens group B is 2.3mm, and the focal length f of the front lens group A isA= 7.08mm, focal length f of rear group lens BBThe air space between the negative meniscus lens A-1 and the positive meniscus thick lens A-2 is 1.3mm, the air space between the plano-convex lens B-1 and the cementing group is 0.1mm, the total optical length TT L of the lens is less than 14mm, and the horizontal field of view is more than 130 degrees;
the curvature radiuses of the object side surface and the image side surface of the negative meniscus lens A-1 are respectively 12-15mm and 2-3mm, and the thickness is 0.7 mm;
the curvature radiuses of the object side surface and the image side surface of the positive meniscus thick lens A-2 are respectively-10 mm to-15 mm, -4mm to-6 mm, and the thickness is 2.0 mm;
the curvature radii of the object side surface and the image side surface of the plano-convex lens B-1 are INF, -4-6 mm respectively, and the thickness is 1.5 mm;
the curvature radii of the object side surface and the image side surface of the biconvex lens B-2 are respectively 5-8mm, -2-4 mm, and the thickness is 2.6 mm;
the curvature radiuses of the object side surface and the image side surface of the negative meniscus lens A-1 are respectively-2 mm to 4mm, -20 mm to 30mm, and the thickness is 0.7 mm.
2. The 1.7mm ultra-wide-angle rear-view vehicular lens according to claim 1, characterized in that: the object side surface of the negative meniscus lens A-1 is plated with a waterproof film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710578816.6A CN107436483B (en) | 2017-07-17 | 2017-07-17 | 1.7mm ultra-wide-angle rear-view vehicle-mounted lens |
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| CN201710578816.6A CN107436483B (en) | 2017-07-17 | 2017-07-17 | 1.7mm ultra-wide-angle rear-view vehicle-mounted lens |
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| CN107436483A CN107436483A (en) | 2017-12-05 |
| CN107436483B true CN107436483B (en) | 2020-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108169874A (en) * | 2017-12-19 | 2018-06-15 | 福建福光股份有限公司 | A kind of high-definition monitoring camera lens of 3.4mm |
| CN109471248B (en) * | 2018-12-28 | 2023-11-14 | 福建福光天瞳光学有限公司 | 3.2mm high-definition ultra-wide-angle lens and working method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100457967B1 (en) * | 2003-12-08 | 2004-12-03 | 장요셉 | Optical system for ultrathin visible and infrared broadband camera |
| JP3765500B2 (en) * | 1993-12-24 | 2006-04-12 | オリンパス株式会社 | Endoscope objective lens |
| CN102713717B (en) * | 2010-05-20 | 2014-07-02 | 奥林巴斯医疗株式会社 | Endoscope objective lens unit and endoscope |
| CN104749750A (en) * | 2013-12-31 | 2015-07-01 | Kolen株式会社 | Optical lens system |
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2017
- 2017-07-17 CN CN201710578816.6A patent/CN107436483B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3765500B2 (en) * | 1993-12-24 | 2006-04-12 | オリンパス株式会社 | Endoscope objective lens |
| KR100457967B1 (en) * | 2003-12-08 | 2004-12-03 | 장요셉 | Optical system for ultrathin visible and infrared broadband camera |
| CN102713717B (en) * | 2010-05-20 | 2014-07-02 | 奥林巴斯医疗株式会社 | Endoscope objective lens unit and endoscope |
| CN104749750A (en) * | 2013-12-31 | 2015-07-01 | Kolen株式会社 | Optical lens system |
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