CN114236772B - Lens - Google Patents
Lens Download PDFInfo
- Publication number
- CN114236772B CN114236772B CN202111632531.9A CN202111632531A CN114236772B CN 114236772 B CN114236772 B CN 114236772B CN 202111632531 A CN202111632531 A CN 202111632531A CN 114236772 B CN114236772 B CN 114236772B
- Authority
- CN
- China
- Prior art keywords
- lens
- power lens
- positive
- negative
- focal power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a lens, which comprises a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, an aperture diaphragm and a second positive focal power lens which are sequentially arranged from an object side to an image sideThe lens system comprises a power lens, a third negative focal power lens, a third positive focal power lens, a fourth positive focal power lens and an image plane; wherein the third negative power lens and the third positive power lens form a cemented lens group; the lens satisfies the following conditions:
wherein f g1 And f is the focal length of the lens, and the FOV is the field angle of the lens. The optical lens has the characteristics of high resolution, miniaturization, low cost, good temperature stability and the like.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
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 pixel requirements of the optical imaging lens are higher and higher. More and more enterprises are beginning to put more research into ultra-high definition, and products with higher pixels and smaller sizes are expected to be developed. For the optical lens, the use of the plastic lens can greatly reduce the volume of the product and the price of the product. More and more mass shots are moving toward the mixing of glass and plastic lenses. And the aspheric surface introduced by the plastic lens can greatly improve the imaging quality to a certain extent.
With the rapid development of the security field, the following problems still exist in the current optical imaging lens: 1. the existing fixed-focus optical lens has small imaging target surface, and most of the imaging target surface is concentrated at 1/2.7 inch or below. 2. The imaging quality is improved, and meanwhile, the size of the whole lens is increased, so that the miniaturization design requirement cannot be met. 3. The plastic lens can greatly improve the mass production consistency of products, and the cost of the lens is greatly reduced by using the plastic lens. The lens commonly used in the market at present is easy to have poor temperature stability. 4. The existing fixed focus lens in the market is generally smaller in aperture, and F numbers are F1.2 and above.
Therefore, there is an urgent need for an optical lens with high resolution, small size, low cost, and good temperature stability.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing an optical lens with high resolution and characteristics of miniaturization, low cost, good temperature stability and the like.
The embodiment of the invention provides a lens, which is formed by sequentially arranging a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, an aperture diaphragm, a second positive focal power lens, a third negative focal power lens, a third positive focal power lens, a fourth positive focal power lens and an image plane from an object side to an image side;
wherein the third negative power lens and the third positive power lens form a cemented lens group;
the lens satisfies the following conditions:
wherein f g1 And f is the focal length of the lens, and the FOV is the field angle of the lens.
Further, 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 convex surface;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the object side is a concave surface;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a convex surface.
Further, the first negative focal power lens, the second negative focal power lens and the fourth positive focal power lens are plastic aspheric lenses.
Further, the first positive power lens is a glass aspherical lens.
Further, the second positive power lens, the third negative power lens and the third positive power lens are glass spherical lenses.
Further, the center radius of curvature R9 of the image side surface of the second positive power lens and the center radius of curvature R10 of the object side surface of the third negative power lens satisfy:
further, a distance from the object plane side of the first negative power lens to the image plane is TTL and a focal length f3 of the first positive power lens satisfies:
further, the focal length f2 of the focal length of the second negative power lens and the focal length f3 of the focal length of the first positive power lens satisfy: f2 is less than or equal to-20; f3 is less than or equal to 11.
Further, the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd5 of the third negative power lens satisfy: vd2 is less than or equal to 61; vd4 is more than or equal to 50; vd5 is less than or equal to 31.
Further, the refractive index Nd3 of the first positive power lens, the refractive index Nd4 of the second positive power lens, and the refractive index Nd6 of the third positive power lens satisfy: nd3 is less than or equal to 1.78; nd4 is less than or equal to 1.65; nd6 is less than or equal to 1.66.
The embodiment of the invention provides a lens, which is formed by sequentially arranging a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, an aperture diaphragm, a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth positive focal power lens from an object side to an image sideAnd an image plane; wherein the third negative power lens and the third positive power lens form a cemented lens group; the lens satisfies the following conditions:
wherein f g1 And f is the focal length of the lens, and the FOV is the field angle of the lens. Since in the embodiment of the present invention, 7 lenses of specific power are sequentially arranged from the object side to the image side in the lens in a specific order, the cemented lens group composed of the third negative power lens and the third positive power lens satisfies: />
The optical lens has the characteristics of high resolution, miniaturization, low cost, good temperature stability and the like.
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 view of a lens structure according to an embodiment of the present invention;
fig. 2 is a graph of optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention at normal temperature in the visible light band;
fig. 3 is a field curvature and distortion diagram of a lens in a visible light band according to embodiment 1 of the present invention;
fig. 4 is a transverse fan diagram of the lens in the visible light band according to embodiment 1 of the present invention;
fig. 5 is a point chart of the lens in the visible light band provided in embodiment 1 of the present invention;
fig. 6 is a graph of optical transfer function (MTF) of the lens barrel according to embodiment 2 of the present invention at normal temperature in the visible light band;
fig. 7 is a field curvature and distortion diagram of a lens in a visible light band according to embodiment 2 of the present invention;
fig. 8 is a transverse fan diagram of the lens in the visible light band according to embodiment 2 of the present invention;
fig. 9 is a point chart of the lens barrel in the visible light band according to embodiment 2 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 view of a lens provided in embodiment 1 of the present invention, in which a first negative focal power lens L1, a second negative focal power lens L2, a first positive focal power lens L3, an aperture stop P, a second positive focal power lens L4, a third negative focal power lens L5, a third positive focal power lens L6, a fourth positive focal power lens L7, and an image plane N are sequentially arranged from an object side to an image side;
wherein the third negative power lens L5 and the third positive power lens L6 constitute a cemented lens group G1;
the lens satisfies the following conditions:
wherein f g1 F is the focal length of the lens, and FOV is the angle of view of the lens, which is the focal length of the cemented lens group G1.
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 purposes of adjustable aperture of light transmission, namely the aperture value of the variable system and the change of depth of field.
Since in the embodiments of the present invention,7 lenses with specific focal powers are sequentially arranged from an object side to an image side in a lens, and a cemented lens group formed by a third negative focal power lens and a third positive focal power lens meets the following conditions:
the optical lens has the characteristics of high resolution, miniaturization, low cost, good temperature stability and the like. And the third negative power lens and the third positive power lens constitute a cemented lens group capable of further reducing the lens size.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the first negative focal power lens is a meniscus lens, and a surface of the first negative focal power lens facing the object side is a convex surface;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the object side is a concave surface;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a convex surface.
In order to make the lens processing performance better, the first negative focal power lens, the second negative focal power lens and the fourth positive focal power lens in the embodiment of the invention are plastic aspheric lenses. The first positive focal power lens is a glass aspheric lens. The second positive focal power lens, the third negative focal power lens and the third positive focal power lens are glass spherical lenses.
In order to further improve the imaging quality of the lens and improve the processing performance of the lens, in the embodiment of the present invention, a central curvature radius R9 of the image side surface of the second positive power lens and a central curvature radius R10 of the object side surface of the third negative power lens satisfy:
to further enable compactness of the system, in an embodiment of the present invention, the distance from the object side of the first negative power lens to the image plane is TTL and the focal length f3 of the first positive power lens satisfies:
in order to further improve the imaging quality of the lens, in the embodiment of the present invention, the focal length f2 of the focal length of the second negative power lens and the focal length f3 of the focal length of the first positive power lens satisfy: f2 is less than or equal to-20; f3 is less than or equal to 11.
In the embodiment of the present invention, in order to enable clear imaging of the lens in a larger temperature range, in the embodiment of the present invention, the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd5 of the third negative power lens satisfy: vd2 is less than or equal to 61; vd4 is more than or equal to 50; vd5 is less than or equal to 31. In addition, the following are satisfied: vd2 is less than or equal to 61; vd4 is more than or equal to 50; vd5 is less than or equal to 31, and can reduce the chromatic aberration of the image, thereby improving the imaging quality.
In order to improve the imaging quality of the lens and reduce the total length of the lens, in the embodiment of the present invention, the refractive index Nd3 of the first positive power lens, the refractive index Nd4 of the second positive power lens, and the refractive index Nd6 of the third positive power lens satisfy: nd3 is less than or equal to 1.78; nd4 is less than or equal to 1.65; nd6 is less than or equal to 1.66. And, satisfy: nd3 is less than or equal to 1.78; nd4 is less than or equal to 1.65; nd6 is less than or equal to 1.66, can reduce spherical aberration and improve imaging quality.
The optical performance realized by the lens provided by the embodiment of the invention is as follows:
the imaging target surface of the optical lens can support 1/1.8 inch at most, so that the high resolution of the lens is effectively realized, the imaging quality is ensured, and the imaging target surface can be suitable for being used in an environment of minus 30 ℃ to 80 ℃. The imaging can be used by a sensor with the maximum supporting target surface of 1/1.8 inch, and the total mechanical length of the lens is not more than 30mm. The full field MTF value is more than 0.6 under the condition of 100 lp/mm. The aperture is larger, the F number is 1.0, and the device is particularly suitable for monitoring requirements under low-illumination conditions. Can meet the requirements at different temperatures.
The following illustrates lens parameters provided in the embodiments of the present invention.
Example 1:
in a specific implementation process, the curvature radius R, the center thickness Tc, the refractive index Nd, the abbe constant Vd and the conic coefficient k of each lens of the lens satisfy the conditions listed in table 1:
TABLE 1
Note that, in the lens structure schematic diagram shown in fig. 1, the mirror numbers in table 1 are the numbers of the lenses from left to right;
the first negative focal power lens, the second negative focal power lens, the first positive focal power lens and the fourth positive focal power lens in the embodiment of the invention are aspheric lenses.
The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; a-F are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th order polynomial coefficients of the aspherical polynomial.
TABLE 2
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 30mm;
lens focal length f:8.0mm;
angle of field of the lens: 64.6 °;
optical distortion of the lens: -11.8%;
diaphragm of lens system: FNO is less than or equal to 1.0;
lens image surface size: phi 8.8mm.
In the embodiment of the invention, the third negative power lens L5 and the lens L6 are a cemented lens group G1, and the focal length of the cemented lens group G1 is f g1 The method comprises the steps of carrying out a first treatment on the surface of the Focal length f of the lens system; the field angle of the lens system is FOV, which satisfies
The central radius of curvature R9 of the image side of the second positive power lens L4 and the central radius of curvature R10 of the object side of the third negative power lens L5 of the optical lens satisfy +.>
The focal length f3 of the first positive focal power lens L3 of the optical lens and the total optical length TTL of the optical lens satisfy +.>
F2= -23.45 of the focal length of the second negative power lens L2 of the optical lens, f3=9.95 of the focal length of the first positive power lens L3; the abbe number Vd 2=23.97 of the glass material of the second negative power lens L2 of the optical lens, the abbe number Vd 4= 65.45 of the glass material of the second positive power lens L4, and the abbe number Vd 5=28.29 of the glass material of the third negative power lens L5 of the optical lens; the refractive index nd3=1.74 of the glass material of the first positive power lens L3, the refractive index nd4=1.60 of the glass material of the second positive power lens L4, and the refractive index nd6=1.62 of the glass material of the third positive power lens L6 of the optical lens.
Example 2:
in a specific implementation process, the curvature radius R, the center thickness Tc, the refractive index Nd, the abbe constant Vd, and the conic coefficient k of each lens of the lens satisfy the conditions listed in table 3:
TABLE 3 Table 3
Note that, in the lens structure schematic diagram shown in fig. 1, the mirror numbers in table 3 are the numbers of the lenses from left to right;
the first negative focal power lens, the second negative focal power lens, the first positive focal power lens and the fourth positive focal power lens in the embodiment of the invention are aspheric lenses. The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; a-F are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th order polynomial coefficients of the aspherical polynomial.
TABLE 4 Table 4
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 30mm;
lens focal length f:7.5mm;
angle of field of the lens: 68.2 °;
optical distortion of the lens: -12.7%;
diaphragm of lens system: FNO is less than or equal to 1.0;
lens image surface size: phi 8.8mm.
In the embodiment of the invention, the third negative power lens L5 and the lens L6 are a cemented lens group G1, and the focal length of the cemented lens group G1 is f g1 The method comprises the steps of carrying out a first treatment on the surface of the Focal length f of the lens system; the field angle of the lens system is FOV, which satisfies
The central radius of curvature R9 of the image side of the second positive power lens L4 and the central radius of curvature R10 of the object side of the third negative power lens L5 of the optical lens satisfy +.>
The focal length f3 of the first positive focal power lens L3 of the optical lens and the total optical length TTL of the optical lens satisfy +.>
F2= -26.38 of the focal length of the second negative power lens L2 of the optical lens, f3=10.45 of the focal length of the first positive power lens L3; the abbe number Vd 2=55.77 of the glass material of the second negative power lens L2 of the optical lens, the abbe number Vd 4= 68.62 of the glass material of the second positive power lens L4, and the abbe number Vd 5=28.31 of the glass material of the third negative power lens L5 of the optical lens; the refractive index nd3=1.73 of the glass material of the first positive power lens L3, the refractive index nd4=1.59 of the glass material of the second positive power lens L4, and the refractive index nd6=1.59 of the glass material of the third positive power lens L6 of the optical lens.
In summary, examples 1 to 2 each satisfy the relationships shown in table 5 below.
TABLE 5
The lens provided by this embodiment will be further described by a detailed analysis of the optical system of the embodiment.
The optical transfer function is a more accurate, visual and common way to evaluate the imaging quality of an optical system, and the higher and smoother the curve, the better the imaging quality of the system, and the better the correction of the aberration.
As shown in fig. 2, an optical transfer function (MTF) curve chart of the lens provided in embodiment 1 of the present invention at normal temperature in the visible light band is shown;
as shown in fig. 3, a field curvature and a distortion chart of the lens in a visible light band provided in embodiment 1 of the present invention are shown;
fig. 4 shows a transverse light fan diagram of the lens in the visible light band according to embodiment 1 of the present invention;
fig. 5 is a point chart of the lens in the visible light band according to embodiment 1 of the present invention;
as shown in fig. 6, an optical transfer function (MTF) curve chart of the lens provided in embodiment 2 of the present invention at normal temperature in the visible light band is shown;
fig. 7 shows a field curvature and a distortion chart of the lens in the visible light band according to embodiment 2 of the present invention;
fig. 8 is a cross light fan diagram of the lens in the visible light band according to embodiment 2 of the present invention;
as shown in fig. 9, a point diagram of the lens barrel in the visible light band according to embodiment 2 of the present invention is shown.
As can be seen from fig. 2 and fig. 6, the optical transfer function (MTF) curve chart of the imaging system in the normal temperature state of the visible light part is smoother and more concentrated, and the MTF average value of the full field of view (half image height Y' =4.4 mm) reaches more than 0.6; the imaging system provided by the embodiment can meet higher imaging requirements.
As can be seen from fig. 3 and 7, the field curvature of the imaging system is controlled within ±0.1 mm. As can be seen from fig. 3, the field curvature of the fixed focus lens provided in embodiment 1 of the present invention is within 0.05mm, and as can be seen from fig. 7, the field curvature of the fixed focus lens provided in embodiment 2 of the present invention is within 0.1 mm. The field Qu Youchen "field curvature". When the lens is curved, the intersection point of the whole light beam does not coincide with the ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface. T represents the meridian curvature and S represents the sagittal curvature. The field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of the field coordinates, and the meridian field curvature data is the distance measured along the Z-axis from the currently determined focal plane to the paraxial focal plane and is measured on the meridian (YZ-plane). The sagittal field curvature data measures the distance measured in a plane perpendicular to the meridian plane, the base line in the diagram being on the optical axis, the top of the curve representing the maximum field of view (angle or height), and no units being placed on the longitudinal axis, since the curve is always normalized by the maximum radial field of view.
As can be seen from fig. 3 and 7, the imaging system distortion control is better, within-13%. Generally, lens distortion is actually a generic term for perspective distortion inherent to an optical lens, that is, distortion due to perspective, which is very detrimental to the imaging quality of a photograph, and after all, the purpose of photographing is to reproduce, not exaggerate, but cannot be eliminated and only improved because it is inherent characteristics of the lens (convex lens converging light, concave lens diverging light). As can be seen from fig. 3, the distortion of the fixed focus lens provided in the embodiment 1 of the present invention is only-11.8%, and the distortion of the fixed focus lens provided in the embodiment 2 of the present invention is only-12.7%, so that the distortion is set to balance the focal length, the angle of view and the size of the corresponding camera target surface, and the deformation caused by the distortion can be corrected by post image processing.
As can be seen from fig. 4 and 8, the curves in the fan diagrams are concentrated, and the spherical aberration and dispersion of the imaging system are also well controlled.
As can be seen from fig. 5 and 9, the imaging system has a smaller spot radius, is relatively concentrated, and has good corresponding aberration and coma.
In summary, the embodiment of the invention provides an optical lens with low cost, large target surface, large aperture and high imaging definition. The imaging system adopts 7 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 embodiment of the invention provides a lens, which is formed by sequentially arranging a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, an aperture diaphragm, a second positive focal power lens, a third negative focal power lens, a third positive focal power lens, a fourth positive focal power lens and an image plane from an object side to an image side; wherein the third negative power lens and the third positive power lens form a cemented lens group; the lens satisfies the following conditions:
wherein f g1 And f is the focal length of the lens, and the FOV is the field angle of the lens. Since in the embodiment of the present invention, 7 lenses of specific power are sequentially arranged from the object side to the image side in the lens in a specific order, the cemented lens group composed of the third negative power lens and the third positive power lens satisfies: />
The optical lens has the characteristics of high resolution, miniaturization, low cost, good temperature stability and the like.
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 (9)
1. The lens is characterized by comprising a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, an aperture diaphragm, a second positive focal power lens, a third negative focal power lens, a third positive focal power lens, a fourth positive focal power lens and an image plane which are sequentially arranged from an object side to an image side;
wherein the third negative power lens and the third positive power lens form a cemented lens group;
the lens satisfies the following conditions:
wherein f g1 F is the focal length of the lens, and FOV is the angle of view of the 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 convex surface;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the object side is a concave surface;
the first positive focal power lens is a biconvex lens;
the second positive focal power lens is a biconvex lens;
the third negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fourth positive focal power lens is a meniscus lens, and one surface of the fourth positive focal power lens facing the object side is a convex surface.
2. The lens of claim 1 wherein the first negative power lens, the second negative power lens and the fourth positive power lens are plastic aspheric lenses.
3. The lens of claim 1 wherein the first positive power lens is a glass aspheric lens.
4. The lens of claim 1 wherein the second positive power lens, the third negative power lens and the third positive power lens are glass sphere lenses.
5. The lens of claim 1 wherein the second positive power lens has a central radius of curvature R9 of its image side and the third negative power lensThe center curvature radius R10 of the object side surface satisfies the following conditions:
6. the lens of claim 1 wherein the distance from the object side of the first negative power lens to the image plane is TTL and the focal length f3 of the first positive power lens satisfies:
7. the lens of claim 1, wherein the focal length f2 of the second negative power lens and the focal length f3 of the first positive power lens satisfy: f2 is less than or equal to-20; f3 is less than or equal to 11.
8. The lens of claim 1, wherein the abbe number Vd2 of the second negative power lens, the abbe number Vd4 of the second positive power lens, and the abbe number Vd5 of the third negative power lens satisfy: vd2 is less than or equal to 61; vd4 is more than or equal to 50; vd5 is less than or equal to 31.
9. The lens of claim 1 wherein the refractive index Nd3 of the first positive power lens, the refractive index Nd4 of the second positive power lens, and the refractive index Nd6 of the third positive power lens satisfy: nd3 is less than or equal to 1.78; nd4 is less than or equal to 1.65; nd6 is less than or equal to 1.66.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632531.9A CN114236772B (en) | 2021-12-29 | 2021-12-29 | Lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632531.9A CN114236772B (en) | 2021-12-29 | 2021-12-29 | Lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114236772A CN114236772A (en) | 2022-03-25 |
| CN114236772B true CN114236772B (en) | 2023-07-04 |
Family
ID=80743966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111632531.9A Active CN114236772B (en) | 2021-12-29 | 2021-12-29 | Lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114236772B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114967065B (en) * | 2022-07-15 | 2022-10-25 | 浙江大华技术股份有限公司 | Lens and camera device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289052B (en) * | 2011-08-22 | 2013-12-04 | 宁波舜宇车载光学技术有限公司 | Ultra wide angle camera lens |
| CN113589478B (en) * | 2021-07-12 | 2023-01-03 | 浙江大华技术股份有限公司 | Lens |
-
2021
- 2021-12-29 CN CN202111632531.9A patent/CN114236772B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114236772A (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111830677B (en) | Lens | |
| CN113589478B (en) | Lens | |
| CN114167578B (en) | Lens | |
| CN114167580B (en) | Lens | |
| CN113777765B (en) | Lens barrel | |
| CN114236772B (en) | Lens | |
| CN114217412B (en) | Lens | |
| CN114167579B (en) | Lens | |
| CN114859532B (en) | Lens and camera device | |
| CN111897090B (en) | Lens | |
| CN111221103B (en) | Lens | |
| CN114924395B (en) | Lens and camera device | |
| CN114185156B (en) | Lens | |
| CN114967065B (en) | Lens and camera device | |
| CN114167588B (en) | Lens | |
| CN114236771B (en) | Lens | |
| CN114924384B (en) | Lens and camera device | |
| CN111897091B (en) | Lens | |
| CN115016104B (en) | Lens and camera device | |
| CN113589479B (en) | Imaging system | |
| CN115291361A (en) | Lens and camera device | |
| CN113325546B (en) | Lens | |
| CN115291359A (en) | Lens and camera device | |
| CN113589503B (en) | Lens barrel | |
| CN113325548B (en) | Lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |