CN114217412A - Lens - Google Patents
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- CN114217412A CN114217412A CN202111484474.4A CN202111484474A CN114217412A CN 114217412 A CN114217412 A CN 114217412A CN 202111484474 A CN202111484474 A CN 202111484474A CN 114217412 A CN114217412 A CN 114217412A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses a lens, which is characterized in that a first positive focal power lens, a second positive focal power lens, a first negative focal power lens, a third positive focal power lens, a second negative focal power lens, a third negative focal power lens, an optical filter and an image plane are sequentially arranged from an object side to an image side; the third positive focal power lens and the second negative focal power lens form a cemented lens group; the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens. The optical lens has the characteristics of high resolving power, large target surface, low cost, large aperture and the like.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Due to the rapid development of automatic driving in recent years, vehicle-mounted optical lenses are increasingly applied in the field of automatic driving, especially in vehicle-mounted lenses, laser radars and the like, and besides the requirements of high pixel and small volume, the requirements of other lenses are also increasing, for example, the field angle is large, the focal length is long, the FNO is small, the illumination intensity is high, the distortion is small, and other performances which are particularly required according to different applications are required. Some properties tend to be difficult to achieve simultaneously with good results.
With the rapid development of the laser radar field, the following problems still exist in the current optical imaging lens: 1. the imaging target surface of the existing optical prime lens is small, most of the imaging target surface is concentrated on 1/2.7 inch, and the existing use requirements cannot be met. 2. The conventional fixed focus lens on the market has a small aperture, and the F number is F1.6 or more. 3. The optical lenses of the lens are more in number, the imaging quality is improved, the size of the whole lens is increased, and the design requirement for miniaturization cannot be met. Therefore, there is a need for an optical lens with high resolution and large target area, low cost, large aperture, etc.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing an optical lens with high resolving power and the characteristics of large target surface, low cost, large aperture and the like.
The embodiment of the present invention provides a lens, in which a first positive power lens, a second positive power lens, a first negative power lens, a third positive power lens, a second negative power lens, a third negative power lens, an optical filter, and an image plane are sequentially arranged from an object side to an image side; the third positive focal power lens and the second negative focal power lens form a cemented lens group;
the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens.
Further, the first positive power lens is a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the second positive focal power lens is a convex lens, one surface of the second positive focal power lens facing the object side is a convex surface, and one surface of the second positive focal power lens facing the image side is a convex surface or a plane;
the first negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the image side is a convex surface;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a convex surface.
Further, the first positive focal power lens, the second positive focal power lens, the third positive focal power lens and the second negative focal power lens are glass spherical lenses;
further, the first negative power lens and the third negative power lens are glass lenses or plastic aspheric lenses.
Further, the central curvature radius R10 of the image side surface of the second negative power lens and the central curvature radius R11 of the object side surface of the third negative power lens satisfy:
further, a focal length f of the first positive power lens1And the distance TTL from the object surface side of the first positive power lens to the image surface satisfies the following conditions: f is not less than 1.61/TTL≤2.5。
Further, f of the focal length of the second positive power lens2F of the focal length of the third negative-power lens6Satisfies the following conditions: f. of2≤42；f6≤-30。
Further, the abbe number Vd1 of the glass material of the first positive power lens, the abbe number Vd3 of the glass material of the first negative power lens, and the abbe number Vd5 of the glass material of the second negative power lens satisfy: vd1 is less than or equal to 62; vd3 is more than or equal to 25; vd5 is less than or equal to 26.
Further, the refractive index Nd3 of the glass material of the first negative power lens, the refractive index Nd5 of the glass material of the second negative power lens, and the refractive index Nd6 of the glass material of the third negative power lens satisfy: nd3 is less than or equal to 1.62; nd5 is less than or equal to 1.96; nd6 is less than or equal to 1.63.
Further, an aperture diaphragm is arranged between the first negative focal power lens and the third positive focal power lens.
The embodiment of the invention provides a lens and a mirrorA first positive focal power lens, a second positive focal power lens, a first negative focal power lens, a third positive focal power lens, a second negative focal power lens, a third negative focal power lens, an optical filter and an image plane are sequentially arranged from the object side to the image side; the third positive focal power lens and the second negative focal power lens form a cemented lens group; the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens.
Since in the embodiment of the present invention, the lenses of 6 specific powers, the third positive power lens and the second negative power lens constitute the cemented lens group in the lens arranged in order from the object side to the image side in a specific order, the lens satisfies
The optical lens has the characteristics of high resolving power, large target surface, low cost, large aperture and the like.
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 provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
fig. 3 is a field curvature and distortion diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 4 is a transverse fan diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 5 is a dot-column diagram of a lens provided in embodiment 1 of the present invention in a visible light band;
fig. 6 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 2 of the present invention in a normal temperature state of a visible light band;
fig. 7 is a field curvature and distortion diagram of a lens provided in embodiment 2 of the present invention in a visible light band;
fig. 8 is a transverse fan diagram of a lens provided in embodiment 2 of the present invention in a visible light band;
fig. 9 is a dot-column diagram of a lens provided in embodiment 2 of the present invention in a visible light band.
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 diagram of a lens according to an embodiment of the present invention, in which a first positive power lens L1, a second positive power lens L2, a first negative power lens L3, a third positive power lens L4, a second negative power lens L5, a third negative power lens L6, an optical filter M, and an image plane N are sequentially arranged from an object side to an image side; the third positive power lens L4 and the second negative power lens L5 form a cemented lens group G;
the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens.
An aperture stop P is arranged between the first negative power lens L3 and the third positive power lens L4.
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.
In the embodiment of the present invention, the third positive power lens L4 and the second negative power lens L5 constituting the cemented lens group can further enable the system to be compact.
Since in the embodiment of the present invention, the lenses of 6 specific powers are arranged in the lens in order from the object side to the image side in a specific order, and the lens satisfies
The optical lens has the characteristics of high resolving power, large target surface, low cost, large aperture and the like.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the first positive power lens is a meniscus lens, and one surface of the first positive power lens facing the object side is a convex surface;
the second positive focal power lens is a convex lens, one surface of the second positive focal power lens facing the object side is a convex surface, and one surface of the second positive focal power lens facing the image side is a convex surface or a plane;
the first negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the image side is a convex surface;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a convex surface.
In order to make the lens processing performance better, the first positive focal power lens, the second positive focal power lens, the third positive focal power lens and the second negative focal power lens in the embodiment of the invention are glass spherical lenses. The first negative focal power lens and the third negative focal power lens are glass lenses or plastic aspheric 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 invention, the second negative-power lensThe central curvature radius R10 of the image side surface and the central curvature radius R11 of the object side surface of the third negative power lens satisfy that:
to further enable the system to be compact, in an embodiment of the invention, the focal length f of the first positive power lens1And the distance TTL from the object surface side of the first positive power lens to the image surface satisfies the following conditions: f is not less than 1.61/TTL≤2.5。
In order to further improve the imaging quality of the lens, in the embodiment of the invention, f of the focal length of the second positive power lens2F of the focal length of the third negative-power lens6Satisfies the following conditions: f. of2≤42；f6≤-30。
In the embodiment of the present invention, in order to enable a lens to form an image clearly in a wide temperature range, in the embodiment of the present invention, the abbe number Vd1 of the glass material of the first positive power lens, the abbe number Vd3 of the glass material of the first negative power lens, and the abbe number Vd5 of the glass material of the second negative power lens satisfy: vd1 is less than or equal to 62; vd3 is more than or equal to 25; vd5 is less than or equal to 26. In addition, the following are satisfied: vd1 is less than or equal to 62; vd3 is more than or equal to 25; vd5 is less than or equal to 26, and the chromatic aberration of the image can be reduced, 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 invention, the refractive index Nd3 of the glass material of the first negative power lens, the refractive index Nd5 of the glass material of the second negative power lens and the refractive index Nd6 of the glass material of the third negative power lens satisfy: nd3 is less than or equal to 1.62; nd5 is less than or equal to 1.96; nd6 is less than or equal to 1.63. And, satisfies: nd3 is less than or equal to 1.62; nd5 is less than or equal to 1.96; the Nd6 is less than or equal to 1.63, the spherical aberration can be reduced, and the imaging quality is improved.
The optical performance of 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, the imaging quality is ensured while the high resolution of the lens is effectively realized, and the optical lens can be suitable for the environment of-40-120 ℃. The imaging can be used by a sensor which can support the target surface at the maximum by 1/1.8 inch, and the total mechanical length of the lens does not exceed 38 mm; the MTF value of the whole field of view reaches more than 0.6 under the condition of 100 lp/mm; the aperture is large, the F number is 1.2, and the device is particularly suitable for monitoring requirements under low illumination conditions. Can meet the requirements at different temperatures.
The following exemplifies the lens parameters provided by the embodiment 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 meet the conditions listed in Table 1:
TABLE 1
Note that the mirror numbers in table 1 are the numbers of the left to right lenses in the schematic view of the lens configuration shown in fig. 1.
Among them, the lens L3 and the lens L6 in the embodiment of the present invention are aspherical lenses.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
wherein Z is the axial rise 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 coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order terms of the aspheric polynomial.
TABLE 2
The lens provided by the embodiment of the invention has the following optical technical indexes:
the total optical length TTL is less than or equal to 46.5 mm;
focal length f of the lens: 30.2 mm;
angle of view of lens: 16.0 degrees;
optical distortion of the lens: 3.8 percent;
aperture of lens system: FNO is less than or equal to 1.3;
size of a lens image plane: phi 8.8 mm.
In the embodiment of the invention, the focal length of the cemented lens group G1 is fg1(ii) a Focal length f of the lens system; the field angle of the lens system is FOV and satisfies
The center curvature radius R10 of the image side of the lens L5 of the optical lens and the center curvature radius R11 of the object side of the lens L6 satisfy
Focal length f of lens L1 of the optical lens1And the total optical length TTL of the optical lens is satisfied
F of focal length of lens L2 of optical lens2F, 39.2, focal length of lens L66-47.8; the abbe number Vd1 of the glass material of the lens L1 of the optical lens is 60.37, the abbe number Vd3 of the glass material of the lens L3 is 30.15, and the abbe number Vd5 of the glass material of the lens L5 of the optical lens is 23.78; the refractive index Nd3 of the glass material of the lens L3 of the optical lens is 1.58, the refractive index Nd5 of the glass material of the lens L5 is 1.84, and the refractive index Nd6 of the glass material of the lens L6 is 1.52.
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 barrel satisfy the conditions listed in table 3:
TABLE 3
Note that the mirror surface numbers in table 3 are the surface numbers of the lenses from left to right in the lens configuration diagram shown in fig. 1.
Among them, the lens L3 and the lens L6 in the embodiment of the present invention are aspherical lenses.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
wherein Z is the axial rise 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 coefficients of 4 th, 6 th, 8 th, 10 th, 12 th and 14 th order terms of the aspheric polynomial.
TABLE 4
The lens provided by the embodiment of the invention has the following optical technical indexes:
the total optical length TTL is less than or equal to 43.2 mm;
focal length f of the lens: 28.0 mm;
angle of view of lens: 17.4 degrees;
optical distortion of the lens: 2.8 percent;
aperture of lens system: FNO is less than or equal to 1.3;
size of a lens image plane: phi 8.8 mm.
In the embodiment of the invention, the focal length of the cemented lens group G1 is fg1(ii) a Focal length f of the lens system; the field angle of the lens system is FOV and satisfies
The center curvature radius R10 of the image side of the lens L5 of the optical lens and the center curvature radius R11 of the object side of the lens L6 satisfy
Focal length f of lens L1 of the optical lens1And the total optical length TTL of the optical lens is satisfied
F of focal length of lens L2 of optical lens2F, of focal length of lens L6, 37.96-34.7; the abbe number Vd1 of the glass material of the lens L1 of the optical lens is 60.37, the abbe number Vd3 of the glass material of the lens L3 is 55.77, and the abbe number Vd5 of the glass material of the lens L5 of the optical lens is 17.98; the refractive index Nd3 of the glass material of the lens L3 of the optical lens is 1.53, the refractive index Nd5 of the glass material of the lens L5 is 1.94, and the refractive index Nd6 of the glass material of the lens L6 is 1.52.
In summary, examples 1 to 2 each satisfy the relationship shown in table 5 below.
TABLE 5
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, a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 of the present invention in a normal temperature state of a visible light band;
as shown in fig. 3, a field curvature and a distortion diagram of the lens provided in embodiment 1 of the present invention in the visible light band;
as shown in fig. 4, a transverse light fan diagram of the lens provided in embodiment 1 of the present invention in the visible light band;
as shown in fig. 5, a dot-column diagram of the lens provided in embodiment 1 of the present invention in the visible light band;
as shown in fig. 6, a graph of an optical transfer function (MTF) of the lens provided in embodiment 2 of the present invention in a normal temperature state of a visible light band;
as shown in fig. 7, a field curvature and a distortion diagram of the lens provided in embodiment 2 of the present invention in the visible light band;
as shown in fig. 8, a transverse light fan diagram of the lens provided in embodiment 2 of the present invention in the visible light band;
as shown in fig. 9, a dot-column diagram of the lens provided in embodiment 2 of the present invention in the visible light band is shown.
As can be seen from fig. 2 and 6, the optical transfer function (MTF) curves of the lens in the normal temperature state in the visible light portion are smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' is 4.4mm) is 0.6 or more; therefore, 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 to within ± 0.1 mm. The curvature of field is also called as "field curvature". When the lens has field curvature, the intersection point of the whole light beam is not overlapped with an 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 meridional field curvature, and S represents the sagittal field 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 field coordinates, and the meridional field curvature data is the distance from the currently determined focal plane to the paraxial focal plane measured along the Z axis and measured in the meridional (YZ plane). Sagittal curvature of field data measures distances measured in a plane perpendicular to the meridian plane, the base line in the schematic is on the optical axis, the top of the curve represents the maximum field of view (angle or height), and no units are set on the vertical axis, since the curve is always normalized by the maximum radial field of view.
As can be seen from fig. 3 and 7, the distortion control of the imaging system is better, within 5%. Generally, lens distortion is a general term of intrinsic perspective distortion of an optical lens, that is, distortion caused by perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photography is to reproduce rather than exaggerate, but because the distortion is intrinsic characteristics of the lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated, and only can be improved. As can be seen from fig. 3, the distortion of the fixed focus lens provided in embodiment 1 of the present invention is only 3.8%, and the distortion of the fixed focus lens provided in embodiment 2 of the present invention is only 2.8%, so that the distortion is set to balance the focal length, the field angle and the size of the target surface of the corresponding camera, and the distortion caused by the distortion can be corrected by the post-image processing.
As can be seen from fig. 4 and 8, the curves in the sector diagrams are more concentrated, and the spherical aberration and the chromatic dispersion of the imaging system are better controlled.
As can be seen from fig. 5 and 9, the imaging system has a small spot radius, is relatively concentrated, and has good corresponding aberration and coma.
In summary, the embodiments of the present invention provide an optical lens with low cost, large target surface, large aperture and high imaging definition. The imaging system adopts 6 optical lenses with specific structural shapes, and the optical lenses are arranged in sequence from the object side to the image side according to a specific sequence, and the specific optical power distribution and combination of the optical lenses enable the imaging system to realize better distortion control and excellent imaging characteristics. The imaging surface size supports a sensor (CCD/CMOS) camera with the maximum diameter of 8.8mm, and the requirement of high resolution of equipment is met; the full field MTF value reaches more than 0.6 under the condition of 100lp/mm, and the imaging characteristic is excellent; the focal power of each lens of the lens is distributed reasonably, the shape of the lens is convenient to process, and the cost of the lens is low. The lens aperture is large, the F number is 1.3, and the lens is particularly suitable for monitoring under the low illumination condition and meeting the requirements of laser radar lenses.
The embodiment of the present invention provides a lens, in which a first positive power lens, a second positive power lens, a first negative power lens, a third positive power lens, a second negative power lens, a third negative power lens, an optical filter, and an image plane are sequentially arranged from an object side to an image side; the third positive focal power lens and the second negative focal power lens form a cemented lens group; the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens.
Since in the embodiment of the present invention, the lenses of 6 specific powers, the third positive power lens and the second negative power lens constitute the cemented lens group in the lens arranged in order from the object side to the image side in a specific order, the lens satisfies
The optical lens has the characteristics of high resolving power, large target surface, low cost, large aperture 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 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. A lens is characterized in that a first positive focal power lens, a second positive focal power lens, a first negative focal power lens, a third positive focal power lens, a second negative focal power lens, a third negative focal power lens, an optical filter and an image plane are sequentially arranged from an object side to an image side; the third positive focal power lens and the second negative focal power lens form a cemented lens group;
the lens satisfies:
wherein f isg1F is the focal length of the cemented lens group, f is the focal length of the lens, and FOV is the field angle of the lens.
2. The lens barrel as claimed in claim 1, wherein the first positive power lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
the second positive focal power lens is a convex lens, one surface of the second positive focal power lens facing the object side is a convex surface, and one surface of the second positive focal power lens facing the image side is a convex surface or a plane;
the first negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the image side is a convex surface;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a convex surface.
3. The lens barrel as claimed in claim 1, wherein the first positive power lens, the second positive power lens, the third positive power lens and the second negative power lens are glass spherical lenses.
4. The lens barrel as claimed in claim 1, wherein the first negative power lens and the third negative power lens are glass lenses or plastic aspherical lenses.
5. The lens barrel as claimed in claim 1, wherein a center radius of curvature R10 of the image side surface of the second negative power lens and a center radius of curvature R11 of the object side surface of the third negative power lens satisfy:
6. the lens barrel as claimed in claim 1, wherein a focal length f of the first positive power lens1And the distance TTL from the object surface side of the first positive power lens to the image surface satisfies the following conditions: f is not less than 1.61/TTL≤2.5。
7. The lens barrel according to claim 1, wherein f of a focal length of the second positive power lens2F of the focal length of the third negative-power lens6Satisfies the following conditions: f. of2≤42；f6≤-30。
8. The lens barrel according to claim 1, wherein an abbe number Vd1 of a glass material of the first positive power lens, an abbe number Vd3 of a glass material of the first negative power lens, and an abbe number Vd5 of a glass material of the second negative power lens satisfy: vd1 is less than or equal to 62; vd3 is more than or equal to 25; vd5 is less than or equal to 26.
9. The lens barrel according to claim 1, wherein a refractive index Nd3 of the glass material of the first negative power lens, a refractive index Nd5 of the glass material of the second negative power lens, and a refractive index Nd6 of the glass material of the third negative power lens satisfy: nd3 is less than or equal to 1.62; nd5 is less than or equal to 1.96; nd6 is less than or equal to 1.63.
10. The lens barrel as claimed in claim 1, wherein an aperture stop is disposed between the first negative power lens and the third positive power lens.
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| CN114879344A (en) * | 2022-05-23 | 2022-08-09 | 东莞市宇瞳汽车视觉有限公司 | Fixed focus lens |
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| CN101387740A (en) * | 2007-09-12 | 2009-03-18 | 富士能株式会社 | Imaging lens and imaging apparatus |
| CN110646920A (en) * | 2019-09-17 | 2020-01-03 | 福建福光天瞳光学有限公司 | Long-focus vehicle-mounted optical lens and working method thereof |
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| CN101276040A (en) * | 2007-03-30 | 2008-10-01 | 富士能株式会社 | Imaging lens and imaging device |
| CN101387740A (en) * | 2007-09-12 | 2009-03-18 | 富士能株式会社 | Imaging lens and imaging apparatus |
| CN110646920A (en) * | 2019-09-17 | 2020-01-03 | 福建福光天瞳光学有限公司 | Long-focus vehicle-mounted optical lens and working method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114879344A (en) * | 2022-05-23 | 2022-08-09 | 东莞市宇瞳汽车视觉有限公司 | Fixed focus lens |
| CN114879344B (en) * | 2022-05-23 | 2023-08-22 | 东莞市宇瞳汽车视觉有限公司 | Fixed focus lens |
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