CN111830677A - Lens - Google Patents
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- CN111830677A CN111830677A CN202010669440.1A CN202010669440A CN111830677A CN 111830677 A CN111830677 A CN 111830677A CN 202010669440 A CN202010669440 A CN 202010669440A CN 111830677 A CN111830677 A CN 111830677A
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- lens
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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
Abstract
The invention discloses a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side; the second lens group comprises a sub-lens group and a third positive power lens which are arranged in sequence from the object side to the image side; the lens group satisfies the following conditions: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is a focal length of the sub-lens group, f2 is a focal length of the fifth lens group, and f is a focal length of the lens. Since, in the embodiment of the present invention, five lens groups are arranged in the lens in order from the object side to the image side in a specific order, and the lens groups in the lens satisfy: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is the focal length of the sub-lens group, f2 is the focal length of the fifth lens group, and f is the focal length of the lens, thereby realizing a lens with small volume and large target surface size.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect of control performance is also bigger and bigger. The existing lens on the market is generally simple in structure, the target surface of the lens is more than 1/1.8 inches or 2/3 inches, the requirement for a large target surface in the monitoring field can not be met gradually, the design volume of a small number of lenses capable of meeting the requirement for the large target surface is generally large, and certain limitation is brought to the adaptability of a product. Therefore, it is important to develop a lens with small volume and large target surface size.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a lens with small volume and large target surface size.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side;
the second lens group comprises a sub-lens group and a third positive power lens which are arranged in sequence from the object side to the image side;
the lens group satisfies the following conditions:
-2.6≤f1*f2/f2≤-2；
wherein f1 is a focal length of the sub-lens group, f2 is a focal length of the fifth lens group, and f is a focal length of the lens.
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;
the curvature radius of one surface of the first positive focal power lens facing the image side is the same as that of one surface of the first negative focal power lens facing the object side;
the first positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the first negative power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface.
Further, the sub-lens group includes a second positive power lens and a second negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the second positive focal power lens facing the image side is the same as that of one surface of the second negative focal power lens facing the object side;
the second positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second negative focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the third positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens facing the image side is convex.
Further, the third lens group includes a fourth positive power lens and a third negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fourth positive focal power lens facing the image side is the same as that of one surface of the third negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
Further, the fourth lens group includes a fifth positive power lens, a fourth negative power lens, and a sixth positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth positive focal power lens facing the image side is the same as that of one surface of the fourth negative focal power lens facing the object side; the curvature radius of one surface of the fourth negative focal power lens facing the image side is the same as that of one surface of the sixth positive focal power lens facing the object side;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the sixth positive power lens includes a double convex lens.
Further, the fifth lens group includes a fifth negative power lens and a seventh positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fifth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the seventh positive power lens includes a double convex lens.
Further, an aperture diaphragm is arranged between the third lens group and the fourth lens group.
Further, an optical filter is arranged between the fifth lens group and the image plane.
Further, the abbe numbers of the first negative focal power lens, the second positive focal power lens and the fifth positive focal power lens are all more than or equal to 65.
Further, the refractive indexes of the first positive power lens and the fourth positive power lens are both larger than or equal to 1.9.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side; the second lens group comprises a sub-lens group and a third positive power lens which are arranged in sequence from the object side to the image side; the lens group satisfies the following conditions: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is a focal length of the sub-lens group, f2 is a focal length of the fifth lens group, and f is a focal length of the lens.
Since, in the embodiment of the present invention, five lens groups are arranged in the lens in order from the object side to the image side in a specific order, and the lens groups in the lens satisfy: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is the focal length of the sub-lens group, f2 is the focal length of the fifth lens group, and f is the focal length of the lens, thereby realizing a lens with small volume and large target surface size.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a lens structure according to an embodiment of the present invention;
fig. 2 is a graph of an optical transfer function (MTF) of the lens in a normal temperature state in a visible light band according to an embodiment of the present invention;
FIG. 3 is a graph of an optical transfer function (MTF) of the lens at-30 ℃ in the visible light band according to an embodiment of the present invention;
fig. 4 is a graph of an optical transfer function (MTF) of the lens in a state of +70 ℃ in a visible light band according to an embodiment of the present invention;
fig. 5 is a graph of an optical transfer function (MTF) of the lens in a near-infrared band normal temperature state according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a lens barrel according to embodiment 1 of the present invention, and the lens barrel includes, in order from an object side to an image side, a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an image plane N;
the second lens group G2 comprises a sub-lens group and a third positive power lens L5 which are arranged in order from the object side to the image side;
the lens group satisfies the following conditions:
-2.6≤f1*f2/f2≤-2；
wherein f1 is a focal length of the sub-lens group, f2 is a focal length of the fifth lens group, and f is a focal length of the lens.
In the embodiment of the present invention, five lens groups are arranged in the lens in order from the object side to the image side in a specific order, the second lens group includes a sub-lens group and a third positive power lens arranged in order from the object side to the image side, and the lens groups in the lens satisfy: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is the focal length of the sub-lens group, f2 is the focal length of the fifth lens group, and f is the focal length of the lens, thereby realizing a lens with small volume and large target surface size.
In order to further improve the imaging quality of the lens, 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;
the curvature radius of one surface of the first positive focal power lens facing the image side is the same as that of one surface of the first negative focal power lens facing the object side;
the first positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the first negative power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface.
To further enable the system to be compact, the first positive power lens and the first negative power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the sub-lens group includes a second positive power lens L3 and a second negative power lens L4 arranged in order from the object side to the image side;
the curvature radius of one surface of the second positive focal power lens facing the image side is the same as that of one surface of the second negative focal power lens facing the object side;
the second positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second negative focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the third positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens facing the image side is convex.
To further enable the system to be compact, the second positive power lens and the second negative power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the third lens group includes a fourth positive power lens L6 and a third negative power lens L7 arranged in order from the object side to the image side;
the curvature radius of one surface of the fourth positive focal power lens facing the image side is the same as that of one surface of the third negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
To further enable the system to be compact, the fourth positive power lens and the third negative power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the present invention, the fourth lens group includes a fifth positive power lens L8, a fourth negative power lens L9, and a sixth positive power lens L10, which are arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth positive focal power lens facing the image side is the same as that of one surface of the fourth negative focal power lens facing the object side; the curvature radius of one surface of the fourth negative focal power lens facing the image side is the same as that of one surface of the sixth positive focal power lens facing the object side;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the sixth positive power lens includes a double convex lens.
To further enable the system to be compact, the fifth positive power lens and the fourth negative power lens may be cemented or otherwise snugly connected. The fourth negative power lens and the sixth positive power lens may be cemented or adhesively connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the present invention, the fifth lens group includes a fifth negative power lens L11 and a seventh positive power lens L12 arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fifth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the seventh positive power lens includes a double convex lens.
To further enable the system to be compact, the fifth negative power lens and the seventh positive power lens may be cemented or otherwise snugly connected.
In the embodiment of the invention, an aperture stop P is arranged between the third lens group and the fourth lens group.
The aperture size of the aperture diaphragm determines the aperture value of the system and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the adjustment of the clear aperture, namely the purpose of changing the aperture value of the system and the depth of field is achieved.
And an optical filter M is arranged between the fifth lens group and the image surface, and the optical filter is an optical device for selecting a required radiation wave band.
In the embodiment of the invention, in order to clearly image at the lens between minus 30 ℃ and 70 ℃, the abbe numbers of the first negative power lens, the second positive power lens and the fifth positive power lens are all more than or equal to 65. In addition, the abbe numbers of the first negative focal power lens, the second positive focal power lens and the fifth positive focal power lens are all larger than or equal to 65, and the chromatic aberration of the image can be reduced, so that the imaging quality is improved. Moreover, abbe numbers of the first negative focal power lens, the second positive focal power lens and the fifth positive focal power lens can be the same or different.
In order to increase the refractive index of the lens and reduce the total length of the lens, in the embodiment of the invention, the refractive index of each of the first positive focal power lens and the fourth positive focal power lens is greater than or equal to 1.9. And the refractive indexes of the first positive focal power lens and the fourth positive focal power lens are both more than or equal to 1.9, so that the spherical aberration can be reduced, and the imaging quality is improved. The refractive indexes of the first positive power lens and the fourth positive power lens can be the same or different.
The optical performance of the lens provided by the embodiment of the invention is as follows: the size of an imaging surface can meet the requirement of a 1.1' sensor, the infrared confocal is realized, and the requirement of small volume is met; the temperature compensation design is carried out in the optical design stage, so that the imaging definition of the lens is hardly reduced in an environment of-30 ℃ to +70 ℃; the MTF value of the full field of view reaches more than 0.45 under the condition of 100lp/mm, and the requirement of the current 1200 ten thousand pixel camera on resolution can be well met.
The embodiment of the invention adopts the technical scheme to realize the infrared confocal lens with an ultra-large target surface, small volume, athermal property, high resolution and infrared property.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
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
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 96 mm;
focal length f' of the lens: 25 mm;
angle of view of lens: 39.6 degrees;
optical distortion of the lens: -2.9%;
aperture fno of lens system: f1.4;
size of a lens image plane: 1.1' (≧ phi 17.6 mm).
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 2, it is a graph of an optical transfer function (MTF) of the lens in a normal temperature state in a visible light band; as shown in fig. 3, it is a graph of the optical transfer function (MTF) of the lens in the visible band-30 ℃; as shown in fig. 4, it is a graph of the optical transfer function (MTF) of the lens in the visible band +70 ℃; as shown in fig. 5, it is a graph of the optical transfer function (MTF) of the lens in the near infrared band at normal temperature. As can be seen from fig. 2 to 5, the optical transfer function (MTF) curve of the imaging system in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half image height Y' is 8.8mm) reaches 0.45 or more; therefore, the imaging system provided by the embodiment can achieve high resolution, and meet the imaging requirement of a 1.1-inch 1200-thousand-pixel camera; meanwhile, at-30 ℃ and +70 ℃, the optical transfer function (MTF) curve graph of the lens provided by the proposal is smooth and concentrated, and the average value of the MTF of the full field of view (the half-image height Y' is 8.8mm) reaches more than 0.45, so that the high imaging quality can be still kept, the lens is ensured to be suitable for the complex environment, and all-weather high-definition video monitoring is realized.
In summary, the embodiment of the invention provides an infrared confocal imaging system and a lens with an ultra-large target surface, a small volume, a thermal difference elimination function and a high resolution. Adopting 12 optical lenses with specific structural shapes, arranging the optical lenses in sequence from the object side to the image side according to a specific sequence, and enabling parameters such as refractive index, Abbe coefficient and the like of the optical lenses to be matched with imaging conditions through distribution of the optical power of each optical lens; therefore, on the premise of larger image surface, the requirement of small volume of an ultra-large target surface is met, and the super-large target has excellent environmental adaptability; the method can be widely applied to the field of security monitoring, especially the field of intelligent transportation and road monitoring.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side; the second lens group comprises a sub-lens group and a third positive power lens which are arranged in sequence from the object side to the image side; the lens group satisfies the following conditions: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein, f1F2 is the focal length of the sub-lens group, and f is the focal length of the lens barrel.
Since, in the embodiment of the present invention, five lens groups are arranged in the lens in order from the object side to the image side in a specific order, and the lens groups in the lens satisfy: -2.6. ltoreq. f1 f2/f2Less than or equal to-2; wherein f1 is the focal length of the sub-lens group, f2 is the focal length of the fifth lens group, and f is the focal length of the lens, thereby realizing a lens with small volume and large target surface 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The lens is characterized by comprising a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image surface which are sequentially arranged from an object side to an image side;
the second lens group comprises a sub-lens group and a third positive power lens which are arranged in sequence from the object side to the image side;
the lens group satisfies the following conditions:
-2.6≤f1*f2/f2≤-2；
wherein f1 is a focal length of the sub-lens group, f2 is a focal length of the fifth lens group, and f is a focal length of the lens.
2. The lens barrel according to claim 1, wherein the first lens group includes a first positive power lens and a first negative power lens arranged in order from an object side to an image side;
the curvature radius of one surface of the first positive focal power lens facing the image side is the same as that of one surface of the first negative focal power lens facing the object side;
the first positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the first negative power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface.
3. The lens barrel according to claim 2, wherein the sub-lens group includes a second positive power lens and a second negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the second positive focal power lens facing the image side is the same as that of one surface of the second negative focal power lens facing the object side;
the second positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second negative focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the third positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens facing the image side is convex.
4. The lens barrel according to claim 2, wherein the third lens group includes a fourth positive power lens and a third negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fourth positive focal power lens facing the image side is the same as that of one surface of the third negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
5. The lens barrel according to claim 3, wherein the fourth lens group includes a fifth positive power lens, a fourth negative power lens, and a sixth positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth positive focal power lens facing the image side is the same as that of one surface of the fourth negative focal power lens facing the object side; the curvature radius of one surface of the fourth negative focal power lens facing the image side is the same as that of one surface of the sixth positive focal power lens facing the object side;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the sixth positive power lens includes a double convex lens.
6. The lens barrel according to claim 1, wherein the fifth lens group includes a fifth negative power lens and a seventh positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fifth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the seventh positive power lens includes a double convex lens.
7. The lens barrel according to claim 1, wherein an aperture stop is provided between the third lens group and the fourth lens group.
8. The lens barrel according to claim 1, wherein an optical filter is disposed between the fifth lens group and an image plane.
9. The lens barrel as claimed in claim 5, wherein the first negative power lens, the second positive power lens and the fifth positive power lens have abbe numbers of 65 or more.
10. The lens barrel as claimed in claim 4, wherein the refractive index of each of the first positive power lens and the fourth positive power lens is 1.9 or more.
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| CN115145009A (en) * | 2022-09-02 | 2022-10-04 | 浙江大华技术股份有限公司 | Lens and camera device |
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| WO2023284145A1 (en) * | 2021-07-12 | 2023-01-19 | Zhejiang Dahua Technology Co., Ltd. | Zoom lens |
| CN115032763A (en) * | 2022-05-20 | 2022-09-09 | 佛山华国光学器材有限公司 | Side surface optical imaging system |
| CN115145009A (en) * | 2022-09-02 | 2022-10-04 | 浙江大华技术股份有限公司 | Lens and camera device |
| CN115145009B (en) * | 2022-09-02 | 2022-11-22 | 浙江大华技术股份有限公司 | Lens and camera device |
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