CN114167578A - Lens - Google Patents
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- CN114167578A CN114167578A CN202111293834.2A CN202111293834A CN114167578A CN 114167578 A CN114167578 A CN 114167578A CN 202111293834 A CN202111293834 A CN 202111293834A CN 114167578 A CN114167578 A CN 114167578A
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- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 239000011521 glass Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 21
- 230000005499 meniscus Effects 0.000 claims description 16
- 230000004304 visual acuity Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 21
- 238000003384 imaging method Methods 0.000 description 21
- 230000006870 function Effects 0.000 description 16
- 238000012546 transfer Methods 0.000 description 8
- 230000004075 alteration Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000012634 optical imaging Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010226 confocal imaging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- G02B13/14—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
The invention discloses a lens, which consists of a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group and a light splitting device which are sequentially arranged from an object side to an image side; each light emitting side of the light splitting device sequentially comprises an optical filter and an image plane; the lens satisfies:
wherein f isG2F is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens. Four lens groups are arranged in the lens in order from an object side to an image side in a specific order, the four lens groups include 13 lenses having specific powers, and the lens satisfies:
the optical lens with high resolving power, large target surface, large aperture, miniaturization and low cost is realized.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Owing to the rapid development of the security monitoring field in recent years, the optical lens is increasingly applied to the security field, and particularly in the fields of intelligent buildings, intelligent transportation and the like, the pixel requirement of the optical imaging lens is higher and higher. Meanwhile, the platform benefiting from the double COMS technology is more mature in use, and the lens is developed towards the direction of double light paths.
With the rapid development of the security field, the fixed focus lens has more stable optical performance compared with a zoom lens, and the demand of the fixed focus lens is the highest. However, the following problems still exist in the existing optical imaging lens: 1. the existing lens has small size of an imaging target surface and low resolution of an acquired image. 2. The lens aperture is small, and under the condition of low illumination, the image of the camera is dark, so that the product adaptability is reduced. 3. The number of lenses is used more, and the lens size is great for whole camera can't realize miniaturized design. 4. The lens resolution is not high, and the imaging quality is general. 5. Most lenses do not have infrared confocal function.
Therefore, there is a need for an optical lens with high resolution and large target area, large aperture, small size and low cost.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing an optical lens with high resolving power, large target surface, large aperture, miniaturization and low cost.
The embodiment of the invention provides a lens, which is composed of a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group and a light splitting device which are sequentially arranged from an object side to an image side; each light emitting side of the light splitting device sequentially comprises an optical filter and an image plane;
the lens satisfies:
wherein f isG2F is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens;
the first lens group consists of a first positive focal power lens, a first negative focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side;
the second lens group consists of a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side;
the third lens group consists of a fourth positive focal power lens, a fifth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side;
the fourth lens group is composed of a sixth positive power lens, a seventh positive power lens and an eighth positive power lens which are arranged in sequence from the object side to the image side.
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 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 biconcave 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 negative power lens is a meniscus lens, and one surface of the fourth negative power lens facing the object side is a concave surface;
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 concave surface;
the fifth negative focal power lens is a biconcave lens;
the fifth positive focal power lens is a biconvex lens;
the sixth positive focal power lens is a biconvex lens;
the seventh positive focal power lens is a biconvex lens;
the eighth positive power lens is a meniscus lens, and one surface of the eighth positive power lens facing the object side is a convex surface.
Further, the third negative power lens and the third positive power lens constitute a cemented lens group.
Further, the fourth positive power lens, the fifth negative power lens, and the fifth positive power lens constitute a cemented lens group.
Further, the central curvature radius R4 of the image side surface of the first negative power lens and the central curvature radius R5 of the object side surface of the second negative power lens satisfy:
further, a distance BFL from the image side surface of the eighth positive power lens to the image surface and a distance TL from the object side surface of the first positive power lens to the image side surface of the eighth positive power lens satisfy: TL/BFL is less than or equal to 2.5.
Further, f1 of the focal length of the first positive power lens, f5 of the focal length of the third negative power lens, and f10 of the focal length of the fifth positive power lens satisfy: f1 is less than or equal to 75; f5 is less than or equal to-14; f10 is less than or equal to 53.
Further, the abbe number Vd1 of the glass material of the first positive power lens, the abbe number Vd7 of the glass material of the fourth negative power lens, and the abbe number Vd12 of the glass material of the seventh positive power lens satisfy: vd1 is less than or equal to 33; vd7 is less than or equal to 30; vd12 is less than or equal to 75.
Further, the refractive index Nd3 of the glass material of the second negative power lens, the refractive index Nd5 of the glass material of the third negative power lens, the refractive index Nd11 of the glass material of the sixth positive power lens, and the refractive index Nd13 of the glass material of the eighth positive power lens satisfy: nd3 is more than or equal to 1.76; nd5 is more than or equal to 1.71; nd11 is less than or equal to 1.80; nd13 is more than or equal to 1.68.
Further, the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions.
The embodiment of the invention provides a lens, which is composed of a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group and a light splitting device which are sequentially arranged from an object side to an image side; each light emitting side of the light splitting device sequentially comprises an optical filter and an image plane; the lens satisfies:
wherein f isG2F is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens; the first lens group consists of a first positive focal power lens, a first negative focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side; the second lens group consists of a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side; the third lens group consists of a fourth positive focal power lens, a fifth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side; the fourth lens group is composed of a sixth positive power lens, a seventh positive power lens and an eighth positive power lens which are arranged in sequence from the object side to the image side.
Since in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel, the four lens groups include 13 lenses of specific power, and the lens barrel satisfies:
the optical lens with high resolving power, large target surface, large aperture, miniaturization and low cost is realized.
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 provided in embodiment 1 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 view of a lens barrel according to embodiment 1, the lens barrel including, in order from an object side to an image side, a first lens group G1, a second lens group G2, an aperture stop P, a third lens group G3, a fourth lens group G4, and a light splitting device Q; each light emitting side of the light splitting device Q sequentially comprises an optical filter M and an image plane N;
the lens satisfies:
wherein f isG2F is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens;
the first lens group G1 is composed of a first positive power lens L1, a first negative power lens L2 and a second negative power lens L3 which are arranged in order from the object side to the image side;
the second lens group G2 is composed of a second positive power lens L4, a third negative power lens L5, a third positive power lens L6 and a fourth negative power lens L7 which are arranged in order from the object side to the image side;
the third lens group G3 is composed of a fourth positive power lens L8, a fifth negative power lens L9, and a fifth positive power lens L10 arranged in this order from the object side to the image side;
the fourth lens group G4 is composed of a sixth positive power lens L11, a seventh positive power lens L12, and an eighth positive power lens L13, which are arranged in this order from the object side to the image side.
The light splitting device comprises two prisms, and film layers with light splitting functions are arranged on the joint surfaces of the two prisms.
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.
Since in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel, the four lens groups include 13 lenses of specific power, and the lens barrel satisfies:
the optical lens with high resolving power, large target surface, large aperture, miniaturization and low cost is realized.
The first lens group consists of a first positive focal power lens, a first negative focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side;
the second lens group consists of a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side;
the third lens group consists of a fourth positive focal power lens, a fifth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side;
the fourth lens group is composed of a sixth positive power lens, a seventh positive power lens and an eighth positive power lens which are arranged in sequence from the object side to the image side.
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 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 biconcave 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 negative power lens is a meniscus lens, and one surface of the fourth negative power lens facing the object side is a concave surface;
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 concave surface;
the fifth negative focal power lens is a biconcave lens;
the fifth positive focal power lens is a biconvex lens;
the sixth positive focal power lens is a biconvex lens;
the seventh positive focal power lens is a biconvex lens;
the eighth positive power lens is a meniscus lens, and one surface of the eighth positive power lens facing the object side is a convex surface.
In order to further enable the system to be compact, in the embodiment of the present invention, the third negative power lens and the third positive power lens constitute a cemented lens group. The fourth positive focal power lens, the fifth negative focal power lens and the fifth positive focal power lens form a cemented lens group.
In order to further improve the imaging quality of the lens and improve the processing performance of the lens, the embodiment of the inventionA central radius of curvature R4 of the image-side surface of the first negative power lens and a central radius of curvature R5 of the object-side surface of the second negative power lens satisfy:
in order to further enable the system to be compact, in the embodiment of the present invention, a distance BFL from the image-side surface of the eighth positive power lens to the image plane and a distance TL from the object-side surface of the first positive power lens to the image-side surface of the eighth positive power lens satisfy: TL/BFL is less than or equal to 2.5.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, f1 of the focal length of the first positive power lens, f5 of the focal length of the third negative power lens, and f10 of the focal length of the fifth positive power lens satisfy: f1 is less than or equal to 75; f5 is less than or equal to-14; f10 is less than or equal to 53.
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 Vd7 of the glass material of the fourth negative power lens, and the abbe number Vd12 of the glass material of the seventh positive power lens satisfy: vd1 is less than or equal to 33; vd7 is less than or equal to 30; vd12 is less than or equal to 75. In addition, the following are satisfied: vd1 is less than or equal to 33; vd7 is less than or equal to 30; vd12 is less than or equal to 75, 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 second negative power lens, the refractive index Nd5 of the glass material of the third negative power lens, the refractive index Nd11 of the glass material of the sixth positive power lens and the refractive index Nd13 of the glass material of the eighth positive power lens satisfy the following conditions: nd3 is more than or equal to 1.76; nd5 is more than or equal to 1.71; nd11 is less than or equal to 1.80; nd13 is more than or equal to 1.68. And, satisfies: nd3 is more than or equal to 1.76; nd5 is more than or equal to 1.71; nd11 is less than or equal to 1.80; the Nd13 is more than or equal to 1.68, and the spherical aberration can be reduced and the imaging quality can be improved.
The optical performance of the lens provided by the embodiment of the invention is as follows:
the lens imaging target surface can support 1.1 inches at most, and the imaging quality is ensured while the miniaturization of the lens structure is effectively realized by adopting a double-light-path design scheme. The imaging can be used by a sensor which can support the target surface by 1.1 inch at most, and the total mechanical length of the lens does not exceed 120 mm; the MTF value of the whole field of view reaches more than 0.6 under the condition of 100 lp/mm; the lens has the advantages of less lens number, good processability and low cost control; the aperture is large, the F number is 1.3, and the device is particularly suitable for monitoring requirements under low illumination conditions.
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 structure shown in fig. 1;
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 120 mm;
focal length f of the lens: 16 mm;
angle of view of lens: 61 degrees;
optical distortion of the lens: -5.1%;
aperture fno of lens system: 1.3;
size of a lens image plane: 1.1'.
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 2:
TABLE 2
Note that, the mirror numbers in table 2 are the numbers of the left to right lenses in the schematic view of the lens structure shown in fig. 1;
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 120 mm;
focal length f of the lens: 16.5 mm;
angle of view of lens: 55 degrees;
optical distortion of the lens: -4.5%;
aperture fno of lens system: 1.2;
size of a lens image plane: 1.1'.
The lens provided by the embodiment is further described below by performing a detailed optical system analysis on the embodiment.
The optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, and the higher and smoother curve of the optical transfer function indicates that the imaging quality of the system is better, and aberration is well corrected.
As shown in fig. 1, a schematic view of a lens structure provided in embodiment 1;
as shown in fig. 2, a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 in a normal temperature state in a visible light band;
as shown in fig. 3, a field curvature and distortion diagram in the visible light band of the lens provided for embodiment 1;
as shown in fig. 4, a transverse fan diagram of the lens provided in embodiment 1 in the visible light band;
as shown in fig. 5, a dot arrangement diagram of the lens provided for embodiment 1 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 in a normal temperature state in a visible light band;
as shown in fig. 7, a field curvature and distortion diagram in the visible light band of the lens provided for embodiment 2;
as shown in fig. 8, a lateral fan diagram of the lens provided in embodiment 2 in the visible light band;
as shown in fig. 9, a dot array diagram of the lens provided for embodiment 2 in the visible light band is provided.
As can be seen from fig. 2, the optical transfer function (MTF) curve of the lens in the normal temperature state in the visible light portion is relatively smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' 9.0mm) is more than 0.6; therefore, the imaging system provided by the embodiment can meet higher imaging requirements.
As can be seen from fig. 6, the optical transfer function (MTF) curve of the lens in the normal temperature state in the visible light portion is relatively smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' 9.0mm) is more than 0.6; therefore, the imaging system provided by the embodiment can meet higher imaging requirements.
As can be seen from fig. 3 and 7, the curvature of field of the lens is controlled within ± 0.05 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 lens distortion control is better, within-5.1%. Fig. 3 coincides in fig. 3 with reference to curves of a plurality of wavelengths (0.436mm, 0.486mm, 0.546mm, 0.587mm, and 0.656 mm). 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. 8, the distortion of the lens provided by the embodiment of the present invention is-5.1%; 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 deformation caused by the distortion can be corrected through 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 lens are better controlled.
As can be seen from fig. 5 and 9, the lens spot radius is small and relatively concentrated, and the corresponding aberration and coma are also good.
In summary, the embodiment of the invention provides an optical zoom lens which has a large target surface, a large aperture, low cost and infrared confocal imaging high definition. The imaging system adopts 13 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 powers of the optical lenses are distributed and combined, so that the imaging system can realize better distortion control and excellent imaging characteristics.
The embodiment of the invention provides a lens, which is composed of a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group and a light splitting device which are sequentially arranged from an object side to an image side; each light emitting side of the light splitting device sequentially comprises an optical filter and an image plane; the lens satisfies:
wherein f isG2F is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens; the first lens group consists of a first positive focal power lens, a first negative focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side; the second lens group consists of a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side; the third lens group consists of a fourth positive focal power lens, a fifth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side; the fourth lens group is composed of a sixth positive power lens, a seventh positive power lens and an eighth positive power lens which are arranged in sequence from the object side to the image side.
Since in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel, the four lens groups include 13 lenses of specific power, and the lens barrel satisfies:
the optical lens with high resolving power, large target surface, large aperture, miniaturization and low cost is realized.
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 the lens is composed of a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group and a light splitting device which are sequentially arranged from an object side to an image side; each light emitting side of the light splitting device sequentially comprises an optical filter and an image plane;
the lens satisfies:
wherein f isG2Is the focal length of the third lens group, f is the system focal length of the lens, and FOV is the field angle of the lens；
The first lens group consists of a first positive focal power lens, a first negative focal power lens and a second negative focal power lens which are arranged in sequence from the object side to the image side;
the second lens group consists of a second positive focal power lens, a third negative focal power lens, a third positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side;
the third lens group consists of a fourth positive focal power lens, a fifth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side;
the fourth lens group is composed of a sixth positive power lens, a seventh positive power lens and an eighth positive power lens which are arranged in sequence from the object side to the image side.
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 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 biconcave 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 negative power lens is a meniscus lens, and one surface of the fourth negative power lens facing the object side is a concave surface;
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 concave surface;
the fifth negative focal power lens is a biconcave lens;
the fifth positive focal power lens is a biconvex lens;
the sixth positive focal power lens is a biconvex lens;
the seventh positive focal power lens is a biconvex lens;
the eighth positive power lens is a meniscus lens, and one surface of the eighth positive power lens facing the object side is a convex surface.
3. The lens barrel according to claim 1, wherein the third negative power lens and the third positive power lens constitute a cemented lens group.
4. The lens barrel according to claim 1, wherein the fourth positive power lens, the fifth negative power lens, and the fifth positive power lens constitute a cemented lens group.
5. The lens barrel as claimed in claim 1, wherein a center radius of curvature R4 of an image side surface of the first negative power lens and a center radius of curvature R5 of an object side surface of the second negative power lens satisfy:
6. the lens barrel according to claim 1, wherein a distance BFL from an image-side surface of the eighth positive power lens to an image surface and a distance TL from an object-side surface of the first positive power lens to an image-side surface of the eighth positive power lens satisfy: TL/BFL is less than or equal to 2.5.
7. The lens barrel according to claim 1, wherein f1 of the focal length of the first positive power lens, f5 of the focal length of the third negative power lens, and f10 of the focal length of the fifth positive power lens satisfy: f1 is less than or equal to 75; f5 is less than or equal to-14; f10 is less than or equal to 53.
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 Vd7 of a glass material of the fourth negative power lens, and an abbe number Vd12 of a glass material of the seventh positive power lens satisfy: vd1 is less than or equal to 33; vd7 is less than or equal to 30; vd12 is less than or equal to 75.
9. The lens barrel according to claim 1, wherein a refractive index Nd3 of a glass material of the second negative power lens, a refractive index Nd5 of a glass material of the third negative power lens, a refractive index Nd11 of a glass material of the sixth positive power lens, and a refractive index Nd13 of a glass material of the eighth positive power lens satisfy: nd3 is more than or equal to 1.76; nd5 is more than or equal to 1.71; nd11 is less than or equal to 1.80; nd13 is more than or equal to 1.68.
10. The lens barrel according to claim 1, wherein the light splitting means includes two prisms, and a joining surface of the two prisms is provided with a film layer having a light splitting function.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047590A (en) * | 2022-05-06 | 2022-09-13 | 福建福光股份有限公司 | Large aperture wide spectrum lens with compact structure |
| CN116027520A (en) * | 2023-03-30 | 2023-04-28 | 深圳市东正光学技术股份有限公司 | Optical imaging system and optical imaging apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007304290A (en) * | 2006-05-10 | 2007-11-22 | Fujinon Corp | Zoom lens for projection and projection type display device |
| CN101598848A (en) * | 2008-06-06 | 2009-12-09 | 鸿富锦精密工业（深圳）有限公司 | Zoom optic lens |
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2021
- 2021-11-03 CN CN202111293834.2A patent/CN114167578B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007304290A (en) * | 2006-05-10 | 2007-11-22 | Fujinon Corp | Zoom lens for projection and projection type display device |
| CN101598848A (en) * | 2008-06-06 | 2009-12-09 | 鸿富锦精密工业（深圳）有限公司 | Zoom optic lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047590A (en) * | 2022-05-06 | 2022-09-13 | 福建福光股份有限公司 | Large aperture wide spectrum lens with compact structure |
| CN116027520A (en) * | 2023-03-30 | 2023-04-28 | 深圳市东正光学技术股份有限公司 | Optical imaging system and optical imaging apparatus |
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| CN114167578B (en) | 2023-06-30 |
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