CN113589479B - Imaging system - Google Patents
Imaging system Download PDFInfo
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- CN113589479B CN113589479B CN202110787541.3A CN202110787541A CN113589479B CN 113589479 B CN113589479 B CN 113589479B CN 202110787541 A CN202110787541 A CN 202110787541A CN 113589479 B CN113589479 B CN 113589479B
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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
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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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Abstract
The invention discloses an imaging system, which is used for imagingThe system comprises a standard lens, wherein the object side of the standard lens further comprises a first lens group, an aperture diaphragm, a second negative focal power lens and a second lens group which are sequentially arranged from the object side to the image side, and the image side of the standard lens further comprises an optical filter and an image plane; the imaging system satisfies the following conditions: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; wherein f g1 F is the focal length of the first lens group g2 And f is the focal length of the imaging system, FOV is the angle of view of the imaging system, and TTL is the distance between the object side facing surface of the first lens group and the image plane. On the basis of ensuring the increase of multiplying power, the imaging system with large target surface and high resolution is realized, and the imaging system is smaller in size.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an imaging system.
Background
The optical lens is beneficial to the high-speed development of the intelligent security field in recent years, and is increasingly applied to the security field, especially in the fields of intelligent buildings, intelligent traffic and the like, and the imaging requirement of the optical lens is higher and higher.
In the prior art, in order to realize the optical magnification, the magnification can only be realized by changing different magnification objective lenses, and a plurality of different objective lenses need to be installed in order to realize the change of different magnification. This not only makes the size of the lens larger, but also the cost of the lens is high. The conventional magnification magnifying lens in the market is generally larger in size, more in lens quantity, poor in processability and higher in cost. The imaging target surface is small in size, the requirements of the current large target surface camera cannot be met, and the imaging characteristics are poor; the requirements of today's high resolution cannot be supported. Therefore, on the basis of ensuring the increase of multiplying power, the development of a large-target-surface and high-resolution imaging system becomes particularly important.
Disclosure of Invention
The embodiment of the invention provides an imaging system, which comprises a standard lens, wherein the object side of the standard lens further comprises a first lens group, an aperture diaphragm, a second negative focal power lens and a second lens group which are sequentially arranged from the object side to the image side, and the image side of the standard lens further comprises an optical filter and an image plane;
the imaging system satisfies the following conditions:
50.6≤(f g1 /f g2 )×f×tan(FOV)≤63.1；
TTL/f≤0.69；
wherein f g1 F is the focal length of the first lens group g2 And f is the focal length of the imaging system, FOV is the angle of view of the imaging system, and TTL is the distance between the object side facing surface of the first lens group and the image plane.
Further, the first lens group includes a first positive power lens and a first negative power lens arranged in order from the object side to the image side.
Further, the first positive power lens comprises a biconvex lens;
the first negative focal power lens comprises a meniscus lens, and one surface of the first negative focal power lens facing the object side is a concave surface;
the curvature radius of the surface of the first positive focal power lens facing the image side is the same as that of the surface of the first negative focal power lens facing the object side.
Further, the second lens group includes a third negative power lens and a second positive power lens arranged in order from the object side to the image side.
Further, the second negative focal power lens comprises a concave lens, and one surface of the concave lens facing to the object side is a concave surface;
the third negative power lens comprises a biconcave lens;
the second positive focal power lens comprises a meniscus lens, and one surface of the second positive focal power lens facing the object side is a convex surface;
the curvature radius of the surface of the third negative focal power lens facing the image side is the same as that of the surface of the second positive focal power lens facing the object side.
Further, the first positive power lens, the first negative power lens, the second negative power lens, the third negative power lens and the second positive power lens are spherical lenses or aspherical lenses.
Further, the radius of curvature R1 of the first positive power lens on the side facing the object side and the radius of curvature R4 of the first negative power lens on the side facing the image side satisfy the following conditions:
(R1-R4)/(R1+R4)≤-2.1。
further, the focal length f1 of the first positive power lens, the focal length f2 of the first negative power lens, and the focal length f3 of the second negative power lens satisfy the following conditions:
f1≤31；f2≤-100；f3≤-95。
further, the abbe number Vd1 of the first positive power lens, the abbe number Vd2 of the first negative power lens, the abbe number Vd4 of the third negative power lens, and the abbe number Vd5 of the second positive power lens satisfy the following conditions:
Vd1≤71；Vd2≤55；Vd4≤43；Vd5≤30。
further, the refractive index Nd2 of the first negative power lens, the refractive index Nd3 of the second negative power lens, the refractive index Nd4 of the third negative power lens, and the refractive index Nd5 of the second positive power lens satisfy the following conditions:
Nd2≥1.65；Nd3≤1.88；Nd4≤1.92；Nd5≥1.69。
the embodiment of the invention provides an imaging system, which comprises a standard lens, wherein the object side of the standard lens further comprises a first lens group, an aperture diaphragm, a second negative focal power lens and a second lens group which are sequentially arranged from the object side to the image side, and the image side of the standard lens further comprises an optical filter and an image plane; the imaging system satisfies the following conditions: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; wherein f g1 F is the focal length of the first lens group g2 And f is the focal length of the imaging system, FOV is the angle of view of the imaging system, and TTL is the distance between the object side facing surface of the first lens group and the image plane.
Since in the embodiment of the invention, the imaging system sequentially arranges the specific optical lenses and the lens groups from the object side to the image side in a specific order, and the imaging system satisfies: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; therefore, the imaging system provided by the embodiment of the invention realizes a large-target-surface high-resolution imaging system on the basis of ensuring the multiplying power increase of the standard lens, and the imaging system has smaller size.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an imaging system according to an embodiment of the present invention;
FIG. 2 is a graph of an optical transfer function (MTF) of an imaging system according to an embodiment of the present invention at ambient conditions in the visible light band;
FIG. 3 is a graph of curvature of field and distortion of an imaging system in the visible light band according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an imaging system in the visible light band according to an embodiment of the present invention;
fig. 5 is a point chart of an imaging system in a visible light band according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of an imaging system provided in an embodiment of the present invention, where the imaging system includes a standard lens Q, an object side of the standard lens further includes a first lens group G1, an aperture stop P, a second negative focal power lens L3, and a second lens group G2 sequentially arranged from the object side to an image side, and the image side of the standard lens further includes an optical filter M and an image plane N;
the imaging system satisfies the following conditions:
50.6≤(f g1 /f g2 )×f×tan(FOV)≤63.1；
TTL/f≤0.69；
wherein f g1 F is the focal length of the first lens group g2 And f is the focal length of the imaging system, FOV is the angle of view of the imaging system, and TTL is the distance between the object side facing surface of the first lens group and the image plane.
The embodiment of the invention does not limit the standard lens, and the standard lens can be a lens with a focal length of 160mm, a lens with a focal length of 180mm and the like.
Since in the embodiment of the invention, the imaging system sequentially arranges the specific optical lenses and the lens groups from the object side to the image side in a specific order, and the imaging system satisfies: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; therefore, the imaging system provided by the embodiment of the invention realizes a large-target-surface high-resolution imaging system on the basis of ensuring the multiplying power increase of the standard lens, and the imaging system has smaller size.
In order to further improve the imaging quality of the imaging system, in the embodiment of the present invention, the first lens group includes a first positive power lens L1 and a first negative power lens L2 arranged in order from the object side to the image side.
To further enable compactness of the system, the lens size is smaller, the first positive power lens comprising a biconvex lens;
the first negative focal power lens comprises a meniscus lens, and one surface of the first negative focal power lens facing the object side is a concave surface;
the curvature radius of the surface of the first positive focal power lens facing the image side is the same as that of the surface of the first negative focal power lens facing the object side.
The first positive power lens L1 and the first negative power lens L2 may be bonded or adhesively bonded.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the second lens group includes a third negative power lens L4 and a second positive power lens L5 arranged in order from the object side to the image side.
To further enable compactness of the system, the lens size is smaller, the second negative power lens comprising a concave lens, the face of which facing the object side is concave;
the third negative power lens comprises a biconcave lens;
the second positive focal power lens comprises a meniscus lens, and one surface of the second positive focal power lens facing the object side is a convex surface;
the curvature radius of the surface of the third negative focal power lens facing the image side is the same as that of the surface of the second positive focal power lens facing the object side.
The third negative power lens and the second positive power lens may be bonded or glued.
In order to further improve the imaging quality of the imaging system, in the embodiment of the invention, the first positive focal power lens, the first negative focal power lens, the second negative focal power lens, the third negative focal power lens and the second positive focal power lens are spherical lenses or aspherical lenses.
The aperture size of the aperture diaphragm P determines the aperture value of the system and the depth of field during shooting, and the aperture size can be fixed or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the purposes of adjusting the aperture of the light transmission aperture, namely, changing the aperture value of the system and changing the depth of field.
In view of the lens processing technology, in order to facilitate lens processing, in the embodiment of the present invention, a radius of curvature R1 of a surface of the first positive power lens facing the object side and a radius of curvature R4 of a surface of the first negative power lens facing the image side satisfy the following conditions:
(R1-R4)/(R1+R4)≤-2.1。
in order to further improve the imaging quality of the imaging system, in the embodiment of the present invention, the focal length f1 of the first positive power lens, the focal length f2 of the first negative power lens, and the focal length f3 of the second negative power lens satisfy the following conditions:
f1≤31；f2≤-100；f3≤-95。
in the embodiment of the present invention, in order to enable the imaging system to clearly image in a larger temperature range, in the embodiment of the present invention, the abbe number Vd1 of the first positive power lens, the abbe number Vd2 of the first negative power lens, the abbe number Vd4 of the third negative power lens, and the abbe number Vd5 of the second positive power lens satisfy the following conditions:
Vd1≤71；Vd2≤55；Vd4≤43；Vd5≤30。
in addition, the Abbe number Vd1 of the first positive power lens, the Abbe number Vd2 of the first negative power lens, the Abbe number Vd4 of the third negative power lens and the Abbe number Vd5 of the second positive power lens satisfy Vd1 less than or equal to 71; vd2 is less than or equal to 55; vd4 is less than or equal to 43; vd5 is less than or equal to 30, and can reduce the chromatic aberration of the image, thereby further improving the imaging quality.
In order to further reduce the total length of the imaging system, in the embodiment of the present invention, the refractive index Nd2 of the first negative power lens, the refractive index Nd3 of the second negative power lens, the refractive index Nd4 of the third negative power lens, and the refractive index Nd5 of the second positive power lens satisfy the following conditions:
Nd2≥1.65；Nd3≤1.88；Nd4≤1.92；Nd5≥1.69。
the refractive index Nd2 of the first negative focal power lens, the refractive index Nd3 of the second negative focal power lens, the refractive index Nd4 of the third negative focal power lens and the refractive index Nd5 of the second positive focal power lens meet that Nd2 is more than or equal to 1.65; nd3 is less than or equal to 1.88; nd4 is less than or equal to 1.92; nd5 is more than or equal to 1.69, can also reduce spherical aberration, further improve the imaging quality.
The optical performance realized by the lens provided by the embodiment of the invention is as follows:
according to the imaging system provided by the embodiment of the invention, on the basis of increasing the multiplying power of the standard lens, the target surface size can be supported by phi 42mm at the highest, so that the structural miniaturization of the imaging system is effectively realized, and the imaging quality is ensured.
(1) The imaging can be carried out by a linear array camera with the highest supporting target surface phi 42mm, and the total mechanical length of an imaging system is not more than 45mm;
(2) the MTF value of the full view field reaches more than 0.4 under the condition of 30 lp/mm;
(3) the imaging system has the advantages of less lenses, good processability and lower cost control.
The imaging system parameters provided by the embodiments of the present invention are illustrated below.
Example 1:
in a specific implementation, the radius of curvature R, the center thickness Tc, the refractive index Nd, and the abbe constant Vd of each lens of the imaging system satisfy the conditions listed in table 1:
table 1 parameter table
The imaging system provided in this embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 360mm;
focal length f:560mm;
angle of view: 4.3 °;
optical distortion: 0.5%;
aperture FNO: FNO is less than or equal to 24.4;
target surface size: and the diameter is more than or equal to phi 42mm.
The imaging system provided by this embodiment is further described below by a detailed analysis of the embodiment.
The optical transfer function is used for evaluating an imaging quality of the imaging system in a more accurate, visual and common mode, and the higher and smoother the curve is, which shows that the better the imaging quality of the system is, the better correction is carried out on various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration and the like).
As shown in fig. 2, an optical transfer function (MTF) graph of the imaging system at normal temperature in the visible light band is shown; as shown in fig. 3, a field curvature and distortion diagram of the imaging system in the visible light band are shown; as shown in fig. 4, a cross-sectional view of the imaging system in the visible light band; as shown in fig. 5, a point column diagram of the imaging system in the visible light band is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve graph of the imaging system at normal temperature in the visible light part is smoother and more concentrated, and the MTF average value in the full field of view (half image height Y' =21 mm) reaches more than 0.4; the imaging system provided by the embodiment can achieve higher imaging requirements;
as can be seen from fig. 3 and 4, the imaging system distortion control is better, within 0.5%, and the curvature of field is controlled within ±2mm. The light aberration control is also better.
As can be seen from fig. 5, the imaging system has a smaller spot radius, is more concentrated, and has good corresponding aberration and coma.
The embodiment of the invention provides an optical imaging system with low cost, large target surface and high imaging definition. The imaging system adopts 5 optical lenses with specific structural shapes, and the optical lenses are sequentially arranged from an object side to an image side according to a specific sequence, and can realize better distortion control and excellent imaging characteristics through the distribution and combination of specific optical power of each optical lens.
The imaging system provided by the embodiment of the invention has the advantages that the imaging surface size maximally supports a phi 42sensor (CCD/CMOS) camera, and the requirement of high resolution of equipment is met; the full-view field MTF value reaches more than 0.5 under the condition of 50lp/mm, and has excellent imaging characteristics; the focal power distribution of each lens of the lens is reasonable, the shape of the lens is convenient to process, and the cost of the lens is low.
The embodiment of the invention provides an imaging system, which comprises a standard lens, wherein the object side of the standard lens further comprises a first lens group, an aperture diaphragm, a second negative focal power lens and a second lens group which are sequentially arranged from the object side to the image side, and the image side of the standard lens further comprises an optical filter and an image plane; the imaging system satisfies the following conditions: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; wherein f g1 F is the focal length of the first lens group g2 And f is the focal length of the imaging system, FOV is the angle of view of the imaging system, and TTL is the distance between the object side facing surface of the first lens group and the image plane.
Since in the embodiment of the invention, the imaging system sequentially arranges the specific optical lenses and the lens groups from the object side to the image side in a specific order, and the imaging system satisfies: 50.6 is less than or equal to (f) g1 /f g2 ) Xf×tan (FOV) is less than or equal to 63.1; TTL/f is less than or equal to 0.69; therefore, the imaging system provided by the embodiment of the invention realizes a large-target-surface high-resolution imaging system on the basis of ensuring the multiplying power increase of the standard lens, and the imaging system has smaller size.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The imaging system comprises a standard lens, and is characterized in that the object side of the standard lens comprises a first lens group, an aperture diaphragm, a second negative focal power lens and a second lens group which are sequentially arranged from the object side to the image side, and the image side of the standard lens comprises an optical filter and an image plane;
the imaging system satisfies the following conditions:
50.6≤(f g1 /f g2 )×f×tan(FOV)≤63.1；
TTL/f≤0.69；
wherein f g1 F is the focal length of the first lens group g2 F is the focal length of the imaging system, FOV is the angle of view of the imaging system, TTL is the distance between the object side facing surface of the first lens group and the image plane;
the first lens group consists of a first positive focal power lens and a first negative focal power lens which are sequentially arranged from the object side to the image side;
the second lens group is composed of a third negative focal power lens and a second positive focal power lens which are sequentially arranged from the object side to the image side.
2. The imaging system of claim 1, wherein the first positive power lens is a biconvex lens;
the first negative focal power lens is a meniscus lens, and one surface of the first negative focal power lens facing the object side is a concave surface;
the curvature radius of the surface of the first positive focal power lens facing the image side is the same as that of the surface of the first negative focal power lens facing the object side.
3. The imaging system of claim 1, wherein the second negative power lens is a concave lens having a concave surface facing the object side;
the third negative focal power lens is a biconcave lens;
the second positive focal power lens is a meniscus lens, and one surface of the second positive focal power lens facing the object side is a convex surface;
the curvature radius of the surface of the third negative focal power lens facing the image side is the same as that of the surface of the second positive focal power lens facing the object side.
4. The imaging system of claim 3, wherein the first positive power lens, the first negative power lens, the second negative power lens, the third negative power lens, and the second positive power lens are spherical lenses or aspherical lenses.
5. The imaging system according to claim 1, wherein a radius of curvature R1 of a face of the first positive power lens toward the object side and a radius of curvature R4 of a face of the first negative power lens toward the image side satisfy the following conditions:
(R1-R4)/(R1+R4)≤-2.1。
6. the imaging system of claim 1, wherein a focal length f1 of the first positive power lens, a focal length f2 of the first negative power lens, and a focal length f3 of the second negative power lens satisfy the following conditions:
f1≤31；f2≤-100；f3≤-95。
7. the imaging system of claim 1, wherein the abbe number Vd1 of the first positive power lens, the abbe number Vd2 of the first negative power lens, the abbe number Vd4 of the third negative power lens, and the abbe number Vd5 of the second positive power lens satisfy the following condition:
Vd1≤71；Vd2≤55；Vd4≤43；Vd5≤30。
8. the imaging system of claim 1, wherein the refractive index Nd2 of the first negative power lens, the refractive index Nd3 of the second negative power lens, the refractive index Nd4 of the third negative power lens, and the refractive index Nd5 of the second positive power lens satisfy the following condition:
Nd2≥1.65；Nd3≤1.88；Nd4≤1.92；Nd5≥1.69。
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| CN110346916A (en) * | 2019-07-23 | 2019-10-18 | 福建福光天瞳光学有限公司 | A kind of backsight optical system and its working method |
| CN110609375A (en) * | 2019-09-25 | 2019-12-24 | 浙江舜宇光学有限公司 | Optical imaging lens |
| JP6644292B1 (en) * | 2019-03-26 | 2020-02-12 | ナルックス株式会社 | Imaging optical system |
| CN210626760U (en) * | 2019-08-21 | 2020-05-26 | 浙江大华技术股份有限公司 | Lens |
| CN112147763A (en) * | 2020-11-05 | 2020-12-29 | 中山联合光电研究院有限公司 | Fixed focus lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6644292B1 (en) * | 2019-03-26 | 2020-02-12 | ナルックス株式会社 | Imaging optical system |
| CN110346916A (en) * | 2019-07-23 | 2019-10-18 | 福建福光天瞳光学有限公司 | A kind of backsight optical system and its working method |
| CN210626760U (en) * | 2019-08-21 | 2020-05-26 | 浙江大华技术股份有限公司 | Lens |
| CN110609375A (en) * | 2019-09-25 | 2019-12-24 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN112147763A (en) * | 2020-11-05 | 2020-12-29 | 中山联合光电研究院有限公司 | Fixed focus lens |
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