CN111856727A - Large-aperture ultra-wide-angle high-definition lens and camera equipment comprising same - Google Patents
Large-aperture ultra-wide-angle high-definition lens and camera equipment comprising same Download PDFInfo
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- CN111856727A CN111856727A CN202010841754.5A CN202010841754A CN111856727A CN 111856727 A CN111856727 A CN 111856727A CN 202010841754 A CN202010841754 A CN 202010841754A CN 111856727 A CN111856727 A CN 111856727A
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- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 239000011521 glass Substances 0.000 claims description 8
- 230000014509 gene expression Effects 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 13
- 230000004075 alteration Effects 0.000 abstract description 4
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- 238000012827 research and development Methods 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 2
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- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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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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Abstract
The invention discloses a large-aperture ultra-wide-angle high-definition lens and a camera device comprising the same, wherein the large-aperture ultra-wide-angle high-definition lens sequentially comprises the following components from an object plane to an image plane along an optical axis: the optical lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter, and is compact in structure, small in overall size, capable of greatly reducing the weight of the optical lens, reducing cost and accelerating the research and development period, high in correction degree of aberration, high in MTF resolution, capable of guaranteeing high definition and uniform imaging on the whole image plane, capable of being matched with 1/2.5 chips (more than eight million pixels), high in field angle of the optical lens system and capable of achieving more than 160 degrees, FNO (false positive) of 1.2, high in luminous flux and better in night shooting effect.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a large-aperture ultra-wide-angle high-definition lens and camera equipment comprising the same.
Background
In the security field, a network camera is a common device in a security system, a lens is a main component of the network camera, the performance of the lens directly affects the imaging quality and the imaging field of view, along with the development of the society, the requirements on the technical indexes of the lens for security monitoring are continuously improved, especially the requirements on the imaging quality at night are higher and higher, the aperture of the ultra-wide-angle lens in the existing scheme is about 2.0, the field angle of the ultra-large-aperture lens in the existing scheme is below 100 degrees, and the aperture must be increased in order to present a better effect in a dark environment. However, the large aperture lens manufactured by the conventional structure design cannot compromise the wide field of view and has low general resolution because the large aperture lens has aberration which is more difficult to correct and brings a larger imaging field of view due to the ultra-wide angle.
Chinese patent application No. CN201611209922.9 discloses a large aperture high definition optical system, which is sequentially provided along an optical axis from an object plane to an image plane: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the object surface side of the first lens is a convex surface, and the image surface side of the first lens is a concave surface; the second lens is a biconcave lens; the third lens is a biconvex lens; the object plane side of the fourth lens is a concave surface, and the image plane side of the fourth lens is a convex surface; the object plane side of the fifth lens is a concave surface, and the image plane side of the fifth lens is a convex surface; the sixth lens is a biconvex lens; the fourth lens and the fifth lens are combined lenses, and the TTL/EFL is less than or equal to 5.5. On the other hand, the embodiment of the invention also provides a lens. The embodiment of the invention mainly comprises six lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other, and the fourth lens and the fifth lens are cemented lenses, so that the lens has optical properties of large aperture, high pixel, low distortion, good heat difference elimination and the like.
However, the wide-angle lens described above has the following disadvantages:
1. small field angle (<100 °);
2. the aperture is small (FNO is 1.70), and the image pickup effect at night is poor;
and 3, the MTF resolution is low.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a large-aperture ultra-wide-angle high-definition lens and an image pickup device comprising the same.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
the utility model provides a large aperture super wide angle high definition camera lens, includes from the object plane to image plane along the optical axis in proper order: the optical filter comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter, wherein the first lens is a glass spherical lens with negative focal power, the object plane side of the first lens is a convex surface, the image plane side of the first lens is a concave surface, the second lens is a plastic aspheric lens with negative focal power, the object plane side of the second lens is a concave surface, and the image plane side of the second lens is a concave surface; the third lens is a plastic aspheric lens with positive focal power, and the object plane side of the third lens is a convex surface and the image plane side of the third lens is a concave surface; the fourth lens is a plastic aspheric lens with positive focal power, and the object plane side of the fourth lens is a convex surface and the image plane side of the fourth lens is a convex surface; the fifth lens is a glass spherical lens with positive focal power, and the object plane side of the fifth lens is a convex surface and the image plane side of the fifth lens is a convex surface; the sixth lens is a plastic aspheric lens with negative focal power, and the object plane side of the sixth lens is a concave surface and the image plane side of the sixth lens is a concave surface; the seventh lens is a plastic aspheric lens with positive focal power, and the object plane side of the seventh lens is a convex surface and the image plane side of the seventh lens is a convex surface; the filter is arranged on the image surface side of the seventh lens; a diaphragm is arranged between the fourth lens and the fifth lens;
the effective total focal length of large aperture super wide angle high definition camera lens is f, and the effective focal length of first lens is f1, the effective focal length of second lens is f2, the effective focal length of third lens is f3, and the effective focal length of fourth lens is f4, the effective focal length of fifth lens is f5, the effective focal length of sixth lens is f6, the effective focal length of seventh lens is f7, and satisfies the following relation: f1/f2 is more than 0.51 and less than 1.32; 2.53 < f3/f4 < 4.25; 1.58 < (f5+ f6+ f7)/f < 5.84; -1.86< f6/f7< -0.49.
As a preferred embodiment of the present invention, the large-aperture ultra-wide-angle high-definition lens satisfies the following conditional expression: l/h <3.83, wherein: l represents the total length of the large-aperture ultra-wide-angle high-definition lens, and h represents the size of the image plane.
In a preferred embodiment of the present invention, the abbe number of the second lens is greater than 40 and less than 55.
In a preferred embodiment of the present invention, the refractive index of the third lens is less than 1.75.
In a preferred embodiment of the present invention, the refractive index of the fourth lens is less than 1.65.
In a preferred embodiment of the present invention, the first lens is a meniscus lens.
In addition, the invention also provides camera equipment which comprises the large-aperture ultra-wide-angle high-definition lens.
Compared with the prior art, the optical lens obtained by adopting 2 glass spherical lenses and 5 plastic non-spherical lenses has compact structure and small overall dimension, greatly reduces the weight of the lens, reduces the cost and accelerates the research and development period, the optical parameters in the optical lens system are better matched with the imaging conditions, so that the aberration of the lens system is corrected to a greater degree, the MTF resolution is high, high definition and uniform imaging on the whole image surface are ensured, a 1/2.5 chip (more than eight million pixels) can be matched, the field angle of the lens reaches more than 160 degrees, the FNO (FNO) reaches 1.2, the luminous flux is large, and the night image pickup effect is better; in addition, all optical glass lenses adopt a spherical surface design, the cold machining process performance of the lenses is good, the cost of glass materials is low, the price of finished lenses is also low, and the yield of mass production is high; all plastic lenses have good processing performance, the research and development period is shortened, and the research and development efficiency is improved.
Drawings
FIG. 1 is a schematic view of a lens according to an embodiment of the invention.
FIG. 2 is a 160lp/mmMTF analysis diagram according to an embodiment of the present invention.
Fig. 3 is a defocus graph according to an embodiment of the present invention.
FIG. 4 is a field curvature diagram of an embodiment of the present invention.
FIG. 5 is a F-Theta distortion diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
As shown in fig. 1, the present embodiment provides a large-aperture ultra-wide-angle high-definition lens, which sequentially includes, from an object plane to an image plane along an optical axis: the optical filter comprises a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an optical filter E8, wherein the first lens E1 is a glass spherical lens with negative optical power, the object surface side of the first lens E1 is a convex surface, and the image surface side of the first lens E1 is a concave surface, the second lens E2 is a plastic aspheric lens with negative optical power, the object surface side of the second lens E2 is a concave surface, and the image surface side of the second lens E2 is a concave surface; the third lens element E3 is a plastic aspheric lens with positive focal power, and the object plane side of the third lens element E3 is a convex surface and the image plane side is a concave surface; the fourth lens element E4 is a plastic aspheric lens with positive focal power, and the object plane side of the fourth lens element E4 is a convex surface and the image plane side is a convex surface; the fifth lens E5 is a glass spherical lens with positive focal power, and the object plane side and the image plane side of the fifth lens E5 are convex surfaces; the sixth lens element E6 is a plastic aspheric lens with negative focal power, and the object plane side of the sixth lens element E6 is a concave surface and the image plane side is a concave surface; the seventh lens element E7 is a plastic aspheric lens with positive focal power, and the seventh lens element E7 has a convex object-side surface and a convex image-side surface; the filter E8 is disposed on the image plane side of the seventh lens E7; a diaphragm ST is arranged between the fourth lens E4 and the fifth lens E5; as can be seen from fig. 1, the fourth lens element E4 and the fifth lens element E5 are both biconvex lenses, which can reduce the tolerance of tilt and decentration and improve the assembly yield
Wherein: as shown in fig. 1, the object surface side of the first lens E1 is S1, the image surface side is S2, the object surface side of the second lens E2 is S3, the image surface side is S4, the object surface side of the third lens E3 is S5, the image surface side is S6, the object surface side of the fourth lens E4 is S7, the image surface side is S8, the object surface side of the fifth lens E5 is S9, the image surface side is S10, the object surface side of the sixth lens E6 is S11, the image surface side is S12, the object surface side of the seventh lens E7 is S13, and the image surface side is S14.
The effective total focal length of large aperture super wide angle high definition camera lens is f, and the effective focal length of first lens is f1, the effective focal length of second lens is f2, the effective focal length of third lens is f3, and the effective focal length of fourth lens is f4, the effective focal length of fifth lens is f5, the effective focal length of sixth lens is f6, the effective focal length of seventh lens is f7, and satisfies the following relation: f1/f2 is more than 0.51 and less than 1.32; 2.53 < f3/f4 < 4.25; 1.58 < (f5+ f6+ f7)/f < 5.84; -1.86< f6/f7< -0.49;
when the value of f1/f2 exceeds the upper limit of 1.32 or is less than 0.51, decentering and tilting between the first lens and the second lens become very sensitive, and have a great influence on MTF, thereby causing a great reduction and instability of yield, and severely controlling the size and increasing the cost, so that the optical lens in the embodiment of the invention can realize better imaging quality and improve the stability of yield when the condition of 0.51 < f1/f2 < 1.32 is satisfied.
In this embodiment, the large-aperture ultra-wide-angle high-definition lens satisfies the following conditional expressions: l/h <3.83, wherein: l represents the total length of the large-aperture ultra-wide-angle high-definition lens, and h represents the size of the image plane.
In this embodiment, the abbe number of the second lens E2 is greater than 40 and less than 55.
In this embodiment, the refractive index of the third lens E3 is less than 1.75.
In this embodiment, the refractive index of the fourth lens E4 is less than 1.65.
In this embodiment, the first lens element E1 is a meniscus lens.
In order to verify the optical performance of the large-aperture ultra-wide-angle high-definition lens in the embodiment, in one embodiment, the effective focal length of an optical system is 2.90mm, the clear aperture is F/1.2, the total length of the optical system is 22.35mm, the field angle is 160 °, the thickness of an optical filter is 0.7mm, the refractive index is 1.52, and the abbe constant is 64.2; the parameters of each lens are shown in tables 1 and 2.
TABLE 1
TABLE 2
In table 1: surf is surface number, Radius is curvature Radius, Thickness is spherical lens Thickness, Index is refractive Index, ABB is Abbe dispersion coefficient, and EFL-E is focal length.
In table 1, mirror numbers 1 and 2 sequentially represent two mirror surfaces of lens 1 in the light incident direction, mirror numbers 3 and 4 represent two mirror surfaces of lens 2 in the light incident direction, mirror numbers 5 and 6 represent two mirror surfaces of lens 3 in the light incident direction, mirror numbers 7 and 8 represent two mirror surfaces of lens 4 in the light incident direction, mirror number 9 represents a stop surface of a lens, mirror numbers 10 and 11 represent two mirror surfaces of lens five in the light incident direction, mirror numbers 12 and 13 represent two mirror surfaces of lens six in the light incident direction, mirror numbers 14 and 15 represent two mirror surfaces of lens seven in the light incident direction, mirror numbers 16 and 17 represent two mirror surfaces of a filter in the light incident direction, and mirror number 18 represents an image plane.
From table 1, it can be seen: the effective focal length of each lens satisfies the following relation: f1/f2 is more than 0.51 and less than 1.32; 2.53 < f3/f4 < 4.25; 1.58 < (f5+ f6+ f7)/f < 5.84; -1.86< f6/f7< -0.49.
The abbe number of the second lens is 45.1, and is more than 40 and less than 55.
In an embodiment of the present invention, L/H is 3.19, satisfying L/H <3.83, wherein: l denotes a total length of the optical lens, and h denotes a size of the image plane.
In the embodiment of the invention, the refractive index of the third lens is 1.54, so that the refractive index of the third lens is less than 1.75
In the embodiment of the invention, the refractive index of the fourth lens is 1.66, and the refractive index of the fourth lens is less than 1.65.
Table 2 shows aspheric data of all plastic aspheric lenses, i.e., the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6 and the seventh lens E7.
In the embodiment of the present invention, fig. 2 is a graph of Modulation Transfer Function (MTF) of the visible light band, which represents the comprehensive resolving power of the optical system, and the horizontal axis in the graph represents spatial frequency, unit: the number of turns per millimeter (cycles/mm), the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother the curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from fig. 2, when the spatial frequency of the visible light band is 160lp/mm, the MTF of the imaging area near the center is greater than 0.65, the imaging quality is good, and it can be seen from the defocus graph of fig. 3 that the depth of focus of the optical lens is good. As can be seen from fig. 2 and 3, the optical lens according to the embodiment of the present invention has corrected and balanced various aberrations to a good level.
FIG. 4 is a curvature of field diagram of the present invention, wherein the curvature of field of the lens is controlled between-0.05 and 0.05.
FIG. 5 is a F-Theta distortion diagram of the lens according to the embodiment of the present invention, wherein the F-Theta distortion of the lens is controlled to be less than-20%.
Example 2
The embodiment provides an image pickup apparatus including the above-described large-aperture ultra-wide-angle high-definition lens.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a large aperture super wide angle high definition camera lens, includes from the object plane to image plane along the optical axis in proper order: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and light filter, its characterized in that: the first lens is a glass spherical lens with negative focal power, the object plane side of the first lens is a convex surface, the image plane side of the first lens is a concave surface, the second lens is a plastic aspheric lens with negative focal power, the object plane side of the second lens is a concave surface, and the image plane side of the second lens is a concave surface; the third lens is a plastic aspheric lens with positive focal power, and the object plane side of the third lens is a convex surface and the image plane side of the third lens is a concave surface; the fourth lens is a plastic aspheric lens with positive focal power, and the object plane side of the fourth lens is a convex surface and the image plane side of the fourth lens is a convex surface; the fifth lens is a glass spherical lens with positive focal power, and the object plane side of the fifth lens is a convex surface and the image plane side of the fifth lens is a convex surface; the sixth lens is a plastic aspheric lens with negative focal power, and the object plane side of the sixth lens is a concave surface and the image plane side of the sixth lens is a concave surface; the seventh lens is a plastic aspheric lens with positive focal power, and the object plane side of the seventh lens is a convex surface and the image plane side of the seventh lens is a convex surface; the filter is arranged on the image surface side of the seventh lens; a diaphragm is arranged between the fourth lens and the fifth lens;
the effective total focal length of large aperture super wide angle high definition camera lens is f, and the effective focal length of first lens is f1, the effective focal length of second lens is f2, the effective focal length of third lens is f3, and the effective focal length of fourth lens is f4, the effective focal length of fifth lens is f5, the effective focal length of sixth lens is f6, the effective focal length of seventh lens is f7, and satisfies the following relation: f1/f2 is more than 0.51 and less than 1.32; 2.53 < f3/f4 < 4.25; 1.58 < (f5+ f6+ f7)/f < 5.84; -1.86< f6/f7< -0.49.
2. The large-aperture ultra-wide-angle high-definition lens according to claim 1, characterized in that: the large-aperture ultra-wide-angle high-definition lens meets the following conditional expression: l/h <3.83, wherein: l represents the total length of the large-aperture ultra-wide-angle high-definition lens, and h represents the size of the image plane.
3. The large-aperture ultra-wide-angle high-definition lens according to claim 1, characterized in that: the abbe number of the second lens is more than 40 and less than 55.
4. The large-aperture ultra-wide-angle high-definition lens according to claim 1, characterized in that: the refractive index of the third lens is less than 1.75.
5. The large-aperture ultra-wide-angle high-definition lens according to claim 1, characterized in that: the refractive index of the fourth lens is less than 1.65.
6. The large-aperture ultra-wide-angle high-definition lens according to claim 1, characterized in that: the first lens is a meniscus lens.
7. An image pickup apparatus characterized in that: comprising a large-aperture ultra-wide-angle high-definition lens as claimed in any one of claims 1 to 6.
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| WO2022111524A1 (en) * | 2020-11-26 | 2022-06-02 | 江西联创电子有限公司 | Optical imaging lens and imaging device |
| CN116125643A (en) * | 2023-02-10 | 2023-05-16 | 中国科学院光电技术研究所 | Super wide-angle bionic machine vision telecentric lens |
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| CN212410948U (en) * | 2020-08-20 | 2021-01-26 | 江西特莱斯光学有限公司 | Large-aperture ultra-wide-angle high-definition lens and camera equipment comprising same |
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| CN116125643A (en) * | 2023-02-10 | 2023-05-16 | 中国科学院光电技术研究所 | Super wide-angle bionic machine vision telecentric lens |
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