CN112180567B - Day and night dual-purpose large-light-through-large-target-surface fixed-focus lens and imaging method thereof - Google Patents
Day and night dual-purpose large-light-through-large-target-surface fixed-focus lens and imaging method thereof Download PDFInfo
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- CN112180567B CN112180567B CN202011254044.9A CN202011254044A CN112180567B CN 112180567 B CN112180567 B CN 112180567B CN 202011254044 A CN202011254044 A CN 202011254044A CN 112180567 B CN112180567 B CN 112180567B
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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
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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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- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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Abstract
本发明涉及一种日夜两用大通光大靶面定焦镜头，所述镜头的光学系统包括沿入射光路自前向后依次设置的光焦度为负的前镜组A和光焦度为正的后镜组B，所述前镜组A包括自前向后依次设置的弯月型透镜A‑1、弯月型透镜A‑2；所述后镜组B包括自前向后依次设置的弯月型透镜B‑1、双凸透镜B‑2和弯月型透镜B‑3、双凸透镜B‑4、弯月型透镜B‑5和双凸透镜B‑6。结构简单，设计合理，光路总长较短，体积较小，成像质量良好；F数值极小，提高镜头通光量，不仅可使整体画面更加明亮，并且使镜头在低照环境下的表现更好，呈现出更清晰的成像效果，实现日夜通用功能。
The present invention relates to a day and night dual-purpose large-light flux and large-target surface fixed-focus lens, the optical system of which comprises a front lens group A with negative focal power and a rear lens group B with positive focal power arranged in sequence from front to back along an incident light path, the front lens group A comprises a meniscus lens A-1 and a meniscus lens A-2 arranged in sequence from front to back; the rear lens group B comprises a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, a meniscus lens B-5 and a biconvex lens B-6 arranged in sequence from front to back. The lens has a simple structure, a reasonable design, a short total optical path length, a small volume and good imaging quality; the F value is extremely small, the lens light flux is increased, not only the overall picture can be brighter, but also the lens can perform better in a low-light environment, present a clearer imaging effect, and realize a day and night universal function.
Description
Technical Field
The invention relates to a day and night dual-purpose large-light-transmission large-target-surface fixed focus lens and an imaging method thereof, and belongs to the technical field of optical devices.
Background
With the rapid development of the camera lens market, in recent years, a miniature camera lens which is standardized and stable and can be matched with a camera is formed, under the condition of stable lens imaging, the requirements of customers on the light flux of the lens are continuously increased, and the security and protection lens in the current market has the problems of small light flux and insufficient imaging.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a day and night dual-purpose large-light-transmission large-target-surface fixed focus lens and an imaging method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the optical system of the lens comprises a front lens group A with negative focal power and a rear lens group B with positive focal power, which are sequentially arranged from front to back along an incident light path, wherein the front lens group A comprises a meniscus lens A-1 and a meniscus lens A-2 which are sequentially arranged from front to back; the rear lens group B comprises a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, a meniscus lens B-5 and a biconvex lens B-6 which are sequentially arranged from front to back.
Preferably, a diaphragm C is arranged between the front lens group A and the rear lens group B, and the air interval between the front lens group A and the rear lens group B is 0.05mm.
Preferably, the air space between the meniscus lens A-1 and the meniscus lens A-2 is 3.7mm, the air space between the meniscus lens B-1 and the biconvex lens B-2 is 0.3mm, the air space between the biconvex lens B-2 and the meniscus lens B-3 is 0.16mm, the air space between the meniscus lens B-3 and the biconvex lens B-4 is 0.05mm, the air space between the biconvex lens B-4 and the meniscus lens B-5 is 0.5mm, and the air space between the meniscus lens B-5 and the biconvex lens B-6 is 0.05mm.
Preferably, the air space between the meniscus lens A-1 and the meniscus lens A-2 is 3.5mm, the air space between the meniscus lens B-1 and the biconvex lens B-2 is 0.25mm, the air space between the biconvex lens B-2 and the meniscus lens B-3 is 0.05mm, the air space between the meniscus lens B-3 and the biconvex lens B-4 is 0.05mm, the air space between the biconvex lens B-4 and the meniscus lens B-5 is 0.8mm, and the air space between the meniscus lens B-5 and the biconvex lens B-6 is 0.05mm.
Preferably, the meniscus lens A-1 is a glass spherical lens, the meniscus lens A-2 is a plastic aspherical lens, the meniscus lens B-1 is a plastic aspherical lens, the biconvex lens B-2 is a glass aspherical lens, the meniscus lens B-3 is a glass spherical lens, the biconvex lens B-4 is a plastic aspherical lens, the meniscus lens B-5 is a plastic aspherical lens, and the biconvex lens B-6 is a glass aspherical lens.
Preferably, the mechanical structure of the lens comprises a main lens barrel, the main lens barrel is of a cylindrical structure with four-stage stepped holes inside, a first space ring is arranged between the meniscus lens A-2 and the meniscus lens B-1, a second space ring is arranged between the biconvex lens B-2 and the meniscus lens B-3, a third space ring is arranged between the meniscus lens B-5 and the biconvex lens B-6, an inner hole at the rear end of the main lens barrel is provided with an annular flange for propping against the outer edge part of the rear end face of the biconvex lens B-6, and the front end of the main lens barrel is provided with a step for dispensing and fixing the meniscus lens A-1.
An imaging method of a day and night dual-purpose big light-transmitting big target surface fixed focus lens is carried out according to the following steps: the light rays sequentially pass through the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6 from front to back for imaging.
Compared with the prior art, the invention has the following beneficial effects: the structure is simple, the design is reasonable, the total length of the light path is short, the volume is small, and the imaging quality is good; the F value is extremely small, the light quantity of the lens is improved, the whole picture can be brighter, the lens can better perform in a low-illumination environment, a clearer imaging effect is presented, and the day and night universal function is realized.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a diagram of an optical system according to embodiment 1 of the present invention.
Fig. 2 is a diagram of an optical system according to embodiment 2 of the present invention.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Example 1: as shown in fig. 1, an optical system of the lens comprises a front lens group a with negative focal power and a rear lens group B with positive focal power, which are sequentially arranged from front to back along an incident light path, wherein the front lens group a comprises a meniscus lens a-1 and a meniscus lens a-2, which are sequentially arranged from front to back; the rear lens group B comprises a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, a meniscus lens B-5 and a biconvex lens B-6 which are sequentially arranged from front to back. The volume is small, the light quantity is large, the imaging quality is good, and the imaging device can be matched with a 1/1.8' target surface.
In the embodiment of the invention, a diaphragm C is arranged between the front lens group A and the rear lens group B, an optical filter is arranged behind the rear lens group B, the air interval between the biconvex lens B-6 and the optical filter is 2.3mm, and the air interval between the front lens group A and the rear lens group B is 0.05mm.
In the embodiment of the invention, the air interval between the meniscus lens A-1 and the meniscus lens A-2 is 3.7mm, the air interval between the meniscus lens B-1 and the biconvex lens B-2 is 0.3mm, the air interval between the biconvex lens B-2 and the meniscus lens B-3 is 0.16mm, the air interval between the meniscus lens B-3 and the biconvex lens B-4 is 0.05mm, the air interval between the biconvex lens B-4 and the meniscus lens B-5 is 0.5mm, and the air interval between the meniscus lens B-5 and the biconvex lens B-6 is 0.05mm.
In the embodiment of the invention, the meniscus lens A-1 is a glass spherical lens, the meniscus lens A-2 is a plastic aspherical lens, the meniscus lens B-1 is a plastic aspherical lens, the biconvex lens B-2 is a glass aspherical lens, the meniscus lens B-3 is a glass spherical lens, the biconvex lens B-4 is a plastic aspherical lens, the meniscus lens B-5 is a plastic aspherical lens, and the biconvex lens B-6 is a glass aspherical lens.
In the embodiment of the invention, the mechanical structure of the lens comprises a main lens barrel, the main lens barrel is of a cylindrical structure with four-stage stepped holes inside, a first space ring is arranged between a meniscus lens A-2 and a meniscus lens B-1, a second space ring is arranged between a biconvex lens B-2 and a meniscus lens B-3, a third space ring is arranged between a meniscus lens B-5 and a biconvex lens B-6, an inner hole at the rear end of the main lens barrel is provided with an annular flange for propping against the outer edge part of the rear end face of the biconvex lens B-6, and the front end of the main lens barrel is provided with a step for dispensing and fixing the meniscus lens A-1. The first spacer ring is provided with a first sharp angle shrinkage cavity used for blocking invalid light, the second spacer ring is provided with a second sharp angle shrinkage cavity used for blocking invalid light, and the third spacer ring is provided with a third sharp angle shrinkage cavity used for blocking invalid light.
In an embodiment of the present invention, a meniscus lens A-1, a meniscus lens A-2, a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, the focal length f, refractive index n and radius of curvature R of the above eight lenses satisfy the following relation:
-10.0≤f1≤-5.0,40.5≤f2≤60.5,-50.1≤f3≤-10.1,4.1≤f4≤10.1,-20.1≤f5≤-8.5,5.1≤f6≤15.1,-10.1≤f7≤-5.1,4.1≤f8≤10.1;
1.5≤n1≤1.7，1.5≤n2≤1.7，1.5≤n3≤1.7，1.7≤n4≤1.9，1.6≤n5≤1.8，1.5≤n6≤1.7，1.5≤n7≤1.7，1.7≤n8≤1.9；
50≤R1≤100,-6≤R3≤-2.3,5.2≤R5≤10.5,6.1≤R7≤10.2,20.2≤R9≤40.2,5.4≤R11≤11.5,-5.14≤R13≤-1.25,3.14≤R15≤8.25;
2.1≤R2≤8.2, -6.14≤R4≤-2.25, 2.5≤R6≤10.2, -15.14≤R8≤-6.25, 5.14≤R10≤10.5,-32.14≤R12≤-10.3,-8.14≤R14≤-3.2,-36.1≤R16≤-10.5.
Wherein f1 to f8 correspond to focal lengths of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; n1 to n8 correspond to refractive indexes of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; r1, R3, R5, R7, R9, R11, R13 and R15 correspond to the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, the radius of curvature of the front mirror surface of the biconvex lens B-6, and R2, R4, R6, R8, R10, R12, R14 and R16 correspond to the radius of curvature of the rear mirror surface of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6, respectively.
In embodiments of the present invention, specific parameter examples for each lens are shown in the following table:
wherein the aspherical surface type equation of the aspherical lens is as follows:
，
wherein c is the basic curvature of the center of the surface, k represents a conical coefficient, r is the radial coordinate of a point on the surface, A1-A8 are high-order aspheric coefficients, and the values of the parameters are shown in the following table:
By reasonably using the combination of the glass lens and the plastic lens and adopting the optical structure of 4G4P glass-plastic combination, the advantages of easy processing of the glass lens and lower cost of the plastic lens are fully exerted, meanwhile, the clear aperture is larger, the F value is 1.0, the angle of view is 140 degrees, the total optical length of the lens is less than 22.5mm, the maximum target surface is 9.1mm, the volume is small and exquisite, and the lens can be matched with various interfaces; the imaging quality is good, clear and bright monitoring pictures can be realized even under low illumination at night, the day and night general function is realized, and meanwhile, the purpose of no coke running in an environment of minus 30 ℃ to plus 80 ℃ can be achieved. The meniscus lens A-1 is tightly matched with the meniscus lens A-2 through soma (light shielding sheet), the meniscus lens A-2 is tightly matched with the meniscus lens B-1 through a first spacing ring, the biconvex lens B-2 is tightly matched with the meniscus lens B-3 through a second spacing ring, and the meniscus lens B-5 is tightly matched with the biconvex lens B-6 through a third spacing ring.
An imaging method of a day and night dual-purpose big light-transmitting big target surface fixed focus lens is carried out according to the following steps: the light rays sequentially pass through the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6 from front to back for imaging.
Example 2: as shown in fig. 2, embodiment 2 is different from embodiment 1 in that the air space between the meniscus lens a-1 and the meniscus lens a-2 is 3.5mm, the air space between the meniscus lens B-1 and the lenticular lens B-2 is 0.25mm, the air space between the lenticular lens B-2 and the meniscus lens B-3 is 0.05mm, the air space between the meniscus lens B-3 and the lenticular lens B-4 is 0.05mm, the air space between the lenticular lens B-4 and the meniscus lens B-5 is 0.8mm, and the air space between the meniscus lens B-5 and the lenticular lens B-6 is 0.05mm.
A meniscus lens A-1, a meniscus lens A-2, a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, the focal length f, refractive index n and radius of curvature R of the above eight lenses satisfy the following relation:
-15.0≤f1≤-5.0,20.5≤f2≤60.5,-50.1≤f3≤-10.1, 4.1≤f4≤10.1,-15.1≤f5≤-5.5,5.1≤f6≤15.1,-10.1≤f7≤-5.1,4.1≤f8≤10.1;
1.5≤n1≤1.7，1.5≤n2≤1.7，1.5≤n3≤1.7，1.7≤n4≤1.9，1.6≤n5≤1.8，1.5≤n6≤1.7，1.5≤n7≤1.7，1.7≤n8≤1.9；
30≤R1≤80，-6≤R3≤-2.3，5.2≤R5≤10.5，5.1≤R7≤8.2，15.2≤R9≤30.2，5.4≤R11≤11.5，-5.14≤R13≤-1.25，3.14≤R15≤8.25；
2.1≤R2≤8.2, -6.14≤R4≤-2.25, 2.5≤R6≤10.2, -25.14≤R8≤-6.25, 5.14≤R10≤10.5,-32.14≤R12≤-10.3,-8.14≤R14≤-3.2,-46.1≤R16≤-18.5.
Wherein f1 to f8 correspond to focal lengths of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; n1 to n8 correspond to refractive indexes of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; r1, R3, R5, R7, R9, R11, R13 and R15 correspond to the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, the radius of curvature of the front mirror surface of the biconvex lens B-6, and R2, R4, R6, R8, R10, R12, R14 and R16 correspond to the radius of curvature of the rear mirror surface of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6, respectively.
Specific examples of parameters for each lens are given in the following table:
wherein the aspherical surface type equation of the aspherical lens is as follows:
，
wherein c is the basic curvature of the center of the surface, k represents a conical coefficient, r is the radial coordinate of a point on the surface, A1-A8 are high-order aspheric coefficients, and the values of the parameters are shown in the following table:
by reasonably using the combination of the glass lens and the plastic lens and adopting the optical structure of 4G4P glass-plastic combination, the advantages of easy processing of the glass lens and lower cost of the plastic lens are fully exerted, meanwhile, the clear aperture is larger, the F value is 1.0, the angle of view is 110 degrees, the total optical length of the lens is less than 22.5mm, the maximum target surface is 9.1mm, the volume is small and exquisite, and the lens can be matched with various interfaces; the imaging quality is good, clear and bright monitoring pictures can be realized even under low illumination at night, the day and night general function is realized, and meanwhile, the purpose of no coke running in an environment of minus 30 ℃ to plus 80 ℃ can be achieved.
The invention is not limited to the best implementation mode, and any person can obtain other various types of day and night dual-purpose large-light-transmission large-target-surface focusing lenses and imaging methods thereof under the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (2)
1. The utility model provides a dual-purpose big light-transmitting big target surface of day night is fixed focus camera lens which characterized in that: the optical system of the lens comprises a front lens group A and a rear lens group B, wherein the front lens group A and the rear lens group B are sequentially arranged along an incident light path from front to back, and the front lens group A comprises a meniscus lens A-1 and a meniscus lens A-2 which are sequentially arranged from front to back; the rear lens group B comprises a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, a meniscus lens B-5 and a biconvex lens B-6 which are sequentially arranged from front to back; a diaphragm C is arranged between the front lens group A and the rear lens group B, and the air interval between the front lens group A and the rear lens group B is 0.05mm; the air space between the meniscus lens A-1 and the meniscus lens A-2 is 3.7mm, the air space between the meniscus lens B-1 and the biconvex lens B-2 is 0.3mm, the air space between the biconvex lens B-2 and the meniscus lens B-3 is 0.16mm, the air space between the meniscus lens B-3 and the biconvex lens B-4 is 0.05mm, the air space between the biconvex lens B-4 and the meniscus lens B-5 is 0.5mm, and the air space between the meniscus lens B-5 and the biconvex lens B-6 is 0.05mm; the meniscus lens A-1 is a glass spherical lens, the meniscus lens A-2 is a plastic aspherical lens, the meniscus lens B-1 is a plastic aspherical lens, the biconvex lens B-2 is a glass aspherical lens, the meniscus lens B-3 is a glass spherical lens, the biconvex lens B-4 is a plastic aspherical lens, the meniscus lens B-5 is a plastic aspherical lens, and the biconvex lens B-6 is a glass aspherical lens; the mechanical structure of the lens comprises a main lens barrel, wherein the main lens barrel is of a cylindrical structure with four-stage stepped holes inside, a first space ring is arranged between a meniscus lens A-2 and a meniscus lens B-1, a second space ring is arranged between a biconvex lens B-2 and a meniscus lens B-3, a third space ring is arranged between a meniscus lens B-5 and a biconvex lens B-6, an inner hole at the rear end of the main lens barrel is provided with an annular flange used for propping against the outer edge part of the rear end face of the biconvex lens B-6, and the front end of the main lens barrel is provided with a step used for dispensing and fixing the meniscus lens A-1;
a meniscus lens A-1, a meniscus lens A-2, a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, the focal length f, refractive index n and radius of curvature R of the above eight lenses satisfy the following relation:
-10.0≤f1≤-5.0,40.5≤f2≤60.5,-50.1≤f3≤-10.1,4.1≤f4≤10.1,-20.1≤f5≤-8.5,5.1≤f6≤15.1,-10.1≤f7≤-5.1,4.1≤f8≤10.1;
1.5≤n1≤1.7，1.5≤n2≤1.7，1.5≤n3≤1.7，1.7≤n4≤1.9，1.6≤n5≤1.8，1.5≤n6≤1.7，1.5≤n7≤1.7，1.7≤n8≤1.9；
50≤R1≤100,-6≤R3≤-2.3,5.2≤R5≤10.5,6.1≤R7≤10.2,20.2≤R9≤40.2,5.4≤R11≤11.5,-5.14≤R13≤-1.25,3.14≤R15≤8.25;
2.1≤R2≤8.2, -6.14≤R4≤-2.25, 2.5≤R6≤10.2, -15.14≤R8≤-6.25, 5.14≤R10≤10.5,-32.14≤R12≤-10.3,-8.14≤R14≤-3.2,-36.1≤R16≤-10.5;
Wherein f1 to f8 correspond to focal lengths of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; n1 to n8 correspond to refractive indexes of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; r1, R3, R5, R7, R9, R11, R13 and R15 correspond to the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, the radius of curvature of the front mirror surface of the biconvex lens B-6, and R2, R4, R6, R8, R10, R12, R14 and R16 correspond to the radius of curvature of the rear mirror surface of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6, respectively;
The imaging method of the day and night dual-purpose large-light-transmission large-target-surface fixed focus lens comprises the following steps: the light rays sequentially pass through the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6 from front to back for imaging.
2. The utility model provides a dual-purpose big light-transmitting big target surface of day night is fixed focus camera lens which characterized in that: the optical system of the lens comprises a front lens group A and a rear lens group B, wherein the front lens group A and the rear lens group B are sequentially arranged along an incident light path from front to back, and the front lens group A comprises a meniscus lens A-1 and a meniscus lens A-2 which are sequentially arranged from front to back; the rear lens group B comprises a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, a meniscus lens B-5 and a biconvex lens B-6 which are sequentially arranged from front to back; a diaphragm C is arranged between the front lens group A and the rear lens group B, and the air interval between the front lens group A and the rear lens group B is 0.05mm; the air space between the meniscus lens A-1 and the meniscus lens A-2 is 3.5mm, the air space between the meniscus lens B-1 and the biconvex lens B-2 is 0.25mm, the air space between the biconvex lens B-2 and the meniscus lens B-3 is 0.05mm, the air space between the meniscus lens B-3 and the biconvex lens B-4 is 0.05mm, the air space between the biconvex lens B-4 and the meniscus lens B-5 is 0.8mm, and the air space between the meniscus lens B-5 and the biconvex lens B-6 is 0.05mm; the meniscus lens A-1 is a glass spherical lens, the meniscus lens A-2 is a plastic aspherical lens, the meniscus lens B-1 is a plastic aspherical lens, the biconvex lens B-2 is a glass aspherical lens, the meniscus lens B-3 is a glass spherical lens, the biconvex lens B-4 is a plastic aspherical lens, the meniscus lens B-5 is a plastic aspherical lens, and the biconvex lens B-6 is a glass aspherical lens; the mechanical structure of the lens comprises a main lens barrel, wherein the main lens barrel is of a cylindrical structure with four-stage stepped holes inside, a first space ring is arranged between a meniscus lens A-2 and a meniscus lens B-1, a second space ring is arranged between a biconvex lens B-2 and a meniscus lens B-3, a third space ring is arranged between a meniscus lens B-5 and a biconvex lens B-6, an inner hole at the rear end of the main lens barrel is provided with an annular flange used for propping against the outer edge part of the rear end face of the biconvex lens B-6, and the front end of the main lens barrel is provided with a step used for dispensing and fixing the meniscus lens A-1;
a meniscus lens A-1, a meniscus lens A-2, a meniscus lens B-1, a biconvex lens B-2, a meniscus lens B-3, a biconvex lens B-4, the focal length f, refractive index n and radius of curvature R of the above eight lenses satisfy the following relation:
-15.0≤f1≤-5.0,20.5≤f2≤60.5,-50.1≤f3≤-10.1, 4.1≤f4≤10.1,-15.1≤f5≤-5.5,5.1≤f6≤15.1,-10.1≤f7≤-5.1,4.1≤f8≤10.1;
1.5≤n1≤1.7，1.5≤n2≤1.7，1.5≤n3≤1.7，1.7≤n4≤1.9，1.6≤n5≤1.8，1.5≤n6≤1.7，1.5≤n7≤1.7，1.7≤n8≤1.9；
30≤R1≤80，-6≤R3≤-2.3，5.2≤R5≤10.5，5.1≤R7≤8.2，15.2≤R9≤30.2，5.4≤R11≤11.5，-5.14≤R13≤-1.25，3.14≤R15≤8.25；
2.1≤R2≤8.2, -6.14≤R4≤-2.25, 2.5≤R6≤10.2, -25.14≤R8≤-6.25, 5.14≤R10≤10.5,-32.14≤R12≤-10.3,-8.14≤R14≤-3.2,-46.1≤R16≤-18.5;
Wherein f1 to f8 correspond to focal lengths of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; n1 to n8 correspond to refractive indexes of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, and the biconvex lens B-6, respectively; r1, R3, R5, R7, R9, R11, R13 and R15 correspond to the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5, the radius of curvature of the front mirror surface of the biconvex lens B-6, and R2, R4, R6, R8, R10, R12, R14 and R16 correspond to the radius of curvature of the rear mirror surface of the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6, respectively;
The imaging method of the day and night dual-purpose large-light-transmission large-target-surface fixed focus lens comprises the following steps: the light rays sequentially pass through the meniscus lens A-1, the meniscus lens A-2, the meniscus lens B-1, the biconvex lens B-2, the meniscus lens B-3, the biconvex lens B-4, the meniscus lens B-5 and the biconvex lens B-6 from front to back for imaging.
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| CN213780511U (en) * | 2020-11-11 | 2021-07-23 | 深圳融合光学科技有限公司 | Day and night dual-purpose large-light-transmission large-target-surface prime lens |
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