CN110412743A - A kind of camera lens - Google Patents
A kind of camera lens Download PDFInfo
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- CN110412743A CN110412743A CN201910615112.0A CN201910615112A CN110412743A CN 110412743 A CN110412743 A CN 110412743A CN 201910615112 A CN201910615112 A CN 201910615112A CN 110412743 A CN110412743 A CN 110412743A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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Abstract
The invention discloses a kind of camera lens, the camera lens includes the first lens group, the second lens group and imaging surface being arranged successively by object side to image side；Lens group meets the following conditions: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；Wherein, f2 is the focal length of the second lens group, and f system is the system focal length of the camera lens, and TTL is the optics overall length of the camera lens, and Fno is the f-number of camera lens, and NL is number of lenses.Lens group due in embodiments of the present invention, being arranged successively two lens groups by object side to image side in particular order in camera lens, and in camera lens meets: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；Therefore lens aperture provided in an embodiment of the present invention is big, high resolution.
Description
Technical field
The present invention relates to optical image technology field more particularly to a kind of camera lenses.
Background technique
Machine visual lens are widely used in the fields such as the manufacturing, quality testing, logistics, medicine, scientific research.Mesh
The preceding general practical aperture of traffic camera lens on the market is mostly F1.6 to 1.8, and under low-light scene, brightness of image is lower, image
Noise is more, influences image definition, needs a large amount of light filling to improve brightness, this is but also light pollution is larger.In addition, city
The resolution of lens of a small number of large apertures is relatively low on face, generally 5,000,000 Pixel-levels, and the picture quality of acquisition is poor.With peace
It is anti-to be promoted to high Qinghua, need camera lens to reach higher performance.Therefore the outstanding of big, high resolution the camera lens change of a aperture is developed
It is important.
Summary of the invention
The embodiment of the invention provides a kind of camera lenses, to solve the problems, such as that lens aperture in the prior art is small.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group and imaging surface；
Lens group meets the following conditions:
1.6 < | f2/f system | < 2.0；
1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；
Wherein, f2 is the focal length of the second lens group, and f system is the system focal length of the camera lens, and TTL is the light of the camera lens
Overall length is learned, Fno is the f-number of camera lens, and NL is number of lenses.
Further, first lens group includes the first negative-power lenses being arranged successively by object side to image side,
Two negative-power lenses, third negative-power lenses group, the first sub-lens group, the second positive power lens and the second sub-lens
Group；
The first sub-lens group includes the first positive power lens, or including the first positive power lens and the 4th negative light
Power lenses；
The second sub-lens group includes third positive power lens and the 5th negative-power lenses.
Further, first negative-power lenses include meniscus lens, direction in first negative-power lenses
The surface of image side is concave surface；
Second negative-power lenses include meniscus lens, towards the surface of image side in second negative-power lenses
For concave surface；
The third negative-power lenses include meniscus lens, towards the surface of image side in the third negative-power lenses
For convex surface, or including biconcave lens；
First positive power lens include biconvex lens；
4th negative-power lenses include meniscus lens, towards the surface of image side in the 4th negative-power lenses
For convex surface；
Second positive power lens include meniscus lens, towards the surface of image side in second positive power lens
For concave surface；
The third positive power lens include biconvex lens；
5th negative-power lenses include meniscus lens, towards the surface of image side in the 5th negative-power lenses
For convex surface, or including biconcave lens.
Further, the second lens group includes third sub-lens group, the 5th positive light focus being arranged successively by object side to image side
Spend lens and the 4th sub-lens group；
The third sub-lens group includes the 6th negative-power lenses and the 4th positive power lens；
The 4th sub-lens group includes that the 7th negative-power lenses, the 6th positive power lens and the 8th negative power are saturating
Mirror.
Further, the 6th negative-power lenses include biconcave lens；
4th positive power lens include biconvex lens；
5th positive power lens include biconvex lens；
7th negative-power lenses include meniscus lens, towards the surface of image side in the 7th negative-power lenses
For concave surface；
6th positive power lens include biconvex lens；
8th negative-power lenses include meniscus lens, towards the surface of image side in the 8th negative-power lenses
For convex surface.
Further, the refractive index of second positive power lens is all larger than 1.90, the 5th positive power lens
Refractive index be all larger than 1.80.
Further, the third negative-power lenses, the first positive power lens, third positive power lens and the 6th
Positive power lens use low-dispersion material.
Further, the third negative-power lenses, the first positive power lens, third positive power lens and the 6th
The Abbe number of positive power lens is all larger than 60.
Further, optical filter is provided between second lens group and the imaging surface.
Further, light bar is provided between first lens group and the second lens group.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group and imaging surface；Lens group meets the following conditions: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*
Fno*Fno*NL*NL)/20000 < 1.25；Wherein, f2 is the focal length of the second lens group, and f system is that the system of the camera lens is burnt
Away from TTL is the optics overall length of the camera lens, and Fno is the f-number of camera lens, and NL is number of lenses.Due in the embodiment of the present invention
In, two lens groups are arranged successively by object side to image side in particular order in camera lens, and the lens group in camera lens is full
Foot: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；Therefore the present invention is implemented
The lens aperture that example provides is big, and resolution ratio is higher.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is camera lens schematic diagram provided in an embodiment of the present invention；
Fig. 2 is lens construction schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the lens construction schematic diagram that the embodiment of the present invention 1 provides；
Fig. 4 is transfer curve figure of the camera lens that provides of the embodiment of the present invention 1 under white light scene；
Fig. 5 is the lens construction schematic diagram that the embodiment of the present invention 2 provides；
Fig. 6 is transfer curve figure of the camera lens that provides of the embodiment of the present invention 2 under white light scene；
Fig. 7 is the lens construction schematic diagram that the embodiment of the present invention 3 provides；
Fig. 8 is transfer curve figure of the camera lens that provides of the embodiment of the present invention 3 under white light scene.
Specific embodiment
The present invention will be describe below in further detail with reference to the accompanying drawings, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Fig. 1 is camera lens schematic diagram provided in an embodiment of the present invention, and the camera lens includes being arranged successively by object side to image side
First lens group G1, the second lens group G2 and imaging surface N；
Lens group meets the following conditions:
1.6 < | f2/f system | < 2.0；
1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；
Wherein, f2 is the focal length of the second lens group, and f system is the system focal length of the camera lens, and TTL is the light of the camera lens
Overall length is learned, Fno is the f-number of camera lens, and NL is number of lenses.
Each lens group in camera lens provided in an embodiment of the present invention has its corresponding focal length f, due to implementing in the present invention
In example, two lens groups, and the lens group in camera lens are arranged successively by object side to image side in particular order in camera lens
Meet: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；Therefore the present invention is real
The lens aperture for applying example offer is big.
In embodiments of the present invention, the absolute value of the focal length and the ratio of the focal length of the camera lens of second lens group is big
In 1.6 and less than 2.0.The absolute value of the ratio of the focal length of the focal length and camera lens of second lens group is too small, although can make camera lens
Length shortens, but will increase spherical aberration, influences picture quality, and the manufacturability of camera lens can reduce.And the second lens
Group focal length and camera lens focal length ratio absolute value it is too big, although can reduce spherical aberration, improve picture quality and
The manufacturability of camera lens, but lens length can be bigger.It the spherical aberration of lens length and camera lens and can make in order to balance
The property made provides the range of the absolute value of the ratio of the focal length of the second lens group and the focal length of camera lens in embodiments of the present invention.
In embodiments of the present invention, the absolute value of the ratio of the focal length of the focal length and camera lens of the second lens group is greater than 1.6 and less than 2.0.
The spherical aberration and manufacturability of lens length and camera lens can preferably be taken into account.
For example, the absolute value of the ratio of the focal length of the focal length and camera lens of the second lens group can be 1.7,1.8 etc..
Fig. 2 is lens construction schematic diagram provided in an embodiment of the present invention, in order to further increase the image quality of camera lens, institute
Stating the first lens group includes the first negative-power lenses 1 being arranged successively by object side to image side, the second negative-power lenses 2, and
Three negative-power lenses groups 3, the first sub-lens group, the second positive power lens 5 and the second sub-lens group C1；
The first sub-lens group includes the first positive power lens 4, or negative including the first positive power lens and the 4th
Power lenses；
The second sub-lens group includes third positive power lens 6 and the 5th negative-power lenses 7.
First sub-lens group shown in Fig. 2 includes the first positive power lens 4, if the first sub-lens group includes first
When positive power lens and four negative-power lenses, in order to enable system can be compact, first positive power lens and
4th negative-power lenses glued can be connected or be fitted and connected.
Specifically, in order to further increase the image quality of camera lens, as shown in Fig. 2, the first negative-power lenses packet
It includes meniscus lens, towards the surface of image side is concave surface in first negative-power lenses；The second negative-power lenses packet
It includes meniscus lens, towards the surface of image side is concave surface in second negative-power lenses；The third negative-power lenses packet
It includes meniscus lens, towards the surface of image side is convex surface in the third negative-power lenses, or including biconcave lens；Described first
Positive power lens include biconvex lens；4th negative-power lenses include meniscus lens, and the 4th negative power is saturating
In mirror towards image side surface be convex surface；Second positive power lens include meniscus lens, and second positive light coke is saturating
In mirror towards image side surface be concave surface；The third positive power lens include biconvex lens；5th negative power is saturating
Mirror includes meniscus lens, towards the surface of image side is convex surface in the 5th negative-power lenses, or including biconcave lens.
Second lens group includes that the third sub-lens group C2, the 5th positive light coke that are arranged successively by object side to image side are saturating
Mirror 10 and the 4th sub-lens group；The third sub-lens group C3 includes the 6th negative-power lenses 8 and the 4th positive power lens
9；The 4th sub-lens group includes the 7th negative-power lenses 11, the 6th positive power lens 12 and the 8th negative-power lenses
13。
In order to which further such that system can be compact, the 6th negative-power lenses 8 and the 4th positive power lens 9 can
With gluing connection or it is fitted and connected；The 4th sub-lens group is saturating including the 7th negative-power lenses 11, the 6th positive light coke
Mirror 12 and the 8th negative-power lenses 13 glued can be connected or are fitted and connected.
In order to further increase the image quality of image, the 6th negative-power lenses include biconcave lens；Described
Four positive power lens include biconvex lens；5th positive power lens include biconvex lens；7th negative power
Lens include meniscus lens, in the 7th negative-power lenses towards image side surface be concave surface；6th positive light coke
Lens include biconvex lens；8th negative-power lenses include meniscus lens, direction in the 8th negative-power lenses
The surface of image side is convex surface.
In order to improve the refractive index of camera lens, reduce camera lens total length, the refractive index of second positive power lens is big
In 1.90, the refractive index of the 5th positive power lens is all larger than 1.80.Such as second the refractive index of positive power lens can
To be 2.0,2.1 etc., the refractive index of the 5th positive power lens can be the 1.9,2.0 etc., and second positive power lens and
The refractive index of 5th positive power lens can be the same or different.
In addition, general spheric glass light is easier than center portion to the edge part focal plane Shi Qi after entering eyeglass
Serious refraction and bending are generated, this phenomenon will lead to sharpness and contrast reduces and the generation of hot spot, so that image
Quality decline.And such aberration is known as spherical aberration.In embodiments of the present invention, the refractive index of second positive power lens
1.90 are all larger than, the refractive index of the 5th positive power lens is all larger than 1.80, can also reduce spherical aberration, improves image
Quality.
The refractive index of second positive power lens is nd5, the refractive index of the 5th positive power lens is nd10.Wherein, nd5
> 1.90, nd10 > 1.80.
Second positive power lens and the 5th positive power lens are all made of Super Hi-Index material, and camera lens can be improved
Refractive index, and then improve the resolution ratio of camera lens.Also, Super Hi-Index material is used, it is saturating that the second positive light coke can also be reduced
The thickness of mirror and the 5th positive power lens, and then reduce the total length of camera lens.
In order to which camera lens can be suitably used for wide in range operating temperature, that is, -40 degrees Celsius to 80 degrees Celsius can clearly at
Picture, in embodiments of the present invention, the third negative-power lenses, the first positive power lens, third positive power lens and
6th positive power lens use low-dispersion material.The third negative-power lenses, the first positive power lens, the positive light of third
The Abbe number of power lenses and the 6th positive power lens is all larger than 60.In addition, third negative-power lenses, the first positive light coke
The Abbe number of lens, third positive power lens and the 6th positive power lens, which is all larger than 60, can also reduce the color difference of image,
To improve picture quality.For example, third negative-power lenses, the first positive power lens, third positive power lens and
The Abbe number of six positive power lens can be 65,68,70 etc..Also, third negative-power lenses, the first positive light coke are saturating
The Abbe number of mirror, third positive power lens and the 6th positive power lens can be the same or different.
The Abbe number of third negative-power lenses is Vd3, the Abbe number of the first positive power lens is Vd4, the positive light of third
The Abbe number of power lenses is Vd6, the Abbe number of the 6th positive power lens is Vd12.Wherein, Vd3 > 60, Vd4 > 60, Vd6 >
60, Vd12 > 60.
Optical filter M, first lens group and the second lens are provided between second lens group and the imaging surface
Light bar P is provided between group.
Light bar P can be fixed and invariable device；Light bar P can also be adjusted automatically continuously, meet contemporary optics instrument with this
The intelligent requirements of device.Optical filter M is the optical device for choosing required radiation wave band.It is image planes N on the right side of optical filter M.
The optical property that camera lens provided in an embodiment of the present invention is realized is as follows: focal length is about 12mm, and aperture Fno <
About 75 degree of 1.25,2 ω of field angle, image planes size y ' is φ 17.5mm.Realize a kind of high-resolution, superstar light, without thermalization etc.
Technical requirements, and it is applicable in monitoring requirement of the road traffic to lane.
In conclusion using the optical lens of 13 or 14 patterns, and being pressed the embodiment of the invention provides a kind of camera lens
It is from left to right arranged successively according to particular order, and the distribution of the focal power by each optical lens, while using reasonable
Optical glass material, so that the structure type of lens system, the parameters such as refractive index, the Abbe number of lens and image-forming condition
Match, and then correct the spherical aberration of lens system, coma, astigmatism, the curvature of field, ratio chromatism, chromatism of position well, to reach
To super large aperture, the resolution ratio of ten million pixel, good environment applicability (from -40 degree to 80 degree).Optical imagery high resolution, energy
Match the cmos imaging chip of 2,000 ten thousand or more pixels；And compact-sized, outer dimension is small, and all optical lenses are all made of
Spherical design, cold machining process is functional, and production cost is low.
Lens aperture provided in an embodiment of the present invention is big, and the light passing amount of camera lens is big, and under low light environment, brightness of image is high, figure
The noise of picture is small, and image definition is high, even if also needing light filling to a certain degree, but the light filling intensity needed can be much smaller,
Light pollution is small, also acts as the effect of power saving environmental protection.And resolution of lens provided in an embodiment of the present invention is high, can reach 1600
It is more than ten thousand Pixel-levels.
For relational expression: 1.6 < | f2/f system | < 2.0, when numerical value is greater than the upper limit, imaging can be promoted, but do not utilized and subtracted
The overall length of mini system；When numerical value is less than lower limit, although system can be more compact, system imaging performance is poor will to be not achieved ten million
The requirement of pixel.
In addition, it is compact to enable the system to, and reach higher imaging performance, the optics overall length of camera lens, number of lenses
Relational expression: 1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25 should be met with f-number.Wherein, TTL is the light of camera lens
Overall length is learned, Fno is the f-number of camera lens, and NL is number of lenses.
It is illustrated below for lens parameters provided in an embodiment of the present invention.
Embodiment 1:
Fig. 3 is lens construction schematic diagram provided in an embodiment of the present invention, and the lens focus is 12.58mm, and aperture Fno is
1.20, camera lens overall length TTL is about 99.8mm.
The data such as radius of curvature, center thickness, refractive index nd and the Abbe constant Vd of each lens, as shown in table 1:
Table 1
It should be noted that the face number in table 1 is in lens construction schematic diagram shown in FIG. 1, by left-to-right lens
Face number.
According in table 1 data and relevant formula it is available: f2=24.65mm；NL=13；| f2/f system |=
1.96；(TTL*Fno*Fno*NL*NL)/20000=1.21；Nd5=2.051；Nd10=1.804；Vd3=61.25；Vd4=
68.62；Vd6=68.62；Vd12=68.62.
Detailed Optical system is carried out below by embodiment 1, is further described mirror provided by the present embodiment 1
Head.
Optical transfer function be for evaluating the mode that the image quality of an optical system is more accurate, intuitive and common,
Its curve is higher, more smooth, shows that the image quality of system is better, has carried out good correction to aberration.
Fig. 4 is transmission function (MTF) curve graph of system under white light conditions, and abscissa is resolution ratio, unit lp/
Mm, ordinate are MTF numerical value, and similar curve hereafter does not repeat no longer to repeat.Such as Fig. 4, it is seen that curve smoothing decline and concentration.
In 140lp/mm, mtf value is greater than 0.3 in image height 7.48mm.To realize system under white light, camera lens can match 2,000
The cmos imaging chip of the above resolution ratio of ten thousand pixels.
Embodiment 2:
Fig. 5 is lens construction schematic diagram provided in an embodiment of the present invention, and the lens focus is 12.13mm, and aperture Fno is
1.02, camera lens overall length TTL are 138mm.
The data such as radius of curvature, center thickness, refractive index nd and the Abbe constant Vd of each lens, as shown in table 2:
Table 2
According in table 2 data and relevant formula it is available: f2=21.65mm；NL=13；| f2/f system |=
1.78；(TTL*Fno*Fno*NL*NL)/20000=1.21；Nd5=2.003；Nd10=1.804；Vd3=81.56；Vd4=
68.35；Vd6=68.35；Vd12=68.35.
Detailed Optical system is carried out below by embodiment 2, is further described mirror provided by the present embodiment 2
Head.
Fig. 6 is transmission function (MTF) curve graph, curve smoothing decline and concentration.In 140lp/mm, in image height 7.48mm
Mtf value is greater than 0.3.To realizing system under white light, camera lens can match the CMOS of the above resolution ratio of 2,000 ten thousand pixels at
As chip.
Embodiment 3:
Fig. 7 is lens construction schematic diagram provided in an embodiment of the present invention, and the lens focus is 12.5mm, and aperture Fno is
1.02 camera lens overall length TTL is 118mm.
The data such as radius of curvature, center thickness, refractive index nd and the Abbe constant Vd of each lens, as shown in table 3:
Table 3
According in table 3 data and relevant formula it is available: f2=21.99mm；NL=14；| f2/f system |=
1.76；(TTL*Fno*Fno*NL*NL)/20000=1.20；Nd5=1.923；Nd10=2.003；Vd3=81.56；Vd4=
68.62；Vd6=68.62；Vd12=68.62.
Detailed Optical system is carried out below by embodiment 3, is further described mirror provided by the present embodiment 3
Head.
Fig. 8 is transmission function (MTF) curve graph, curve smoothing decline and concentration.In 140lp/mm, in image height 7.48mm
Mtf value is greater than 0.3.To realizing system under white light, camera lens can match the CMOS of the above resolution ratio of 2,000 ten thousand pixels at
As chip.
The embodiment of the invention provides a kind of camera lens, the camera lens includes the first lens being arranged successively by object side to image side
Group, the second lens group and imaging surface；Lens group meets the following conditions: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*
Fno*Fno*NL*NL)/20000 < 1.25；Wherein, f2 is the focal length of the second lens group, and f system is that the system of the camera lens is burnt
Away from TTL is the optics overall length of the camera lens, and Fno is the f-number of camera lens, and NL is number of lenses.Due in the embodiment of the present invention
In, two lens groups are arranged successively by object side to image side in particular order in camera lens, and the lens group in camera lens is full
Foot: 1.6 < | f2/f system | < 2.0；1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；Therefore the present invention is implemented
The lens aperture that example provides is big.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions each in flowchart and/or the block diagram
The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computers
Processor of the program instruction to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
To generate a machine, so that generating use by the instruction that computer or the processor of other programmable data processing devices execute
In the dress for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
It sets.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of camera lens, which is characterized in that the camera lens include the first lens group being arranged successively by object side to image side, second thoroughly
Microscope group and imaging surface；
Lens group meets the following conditions:
1.6 < | f2/f system | < 2.0；
1.15 < (TTL*Fno*Fno*NL*NL)/20000 < 1.25；
Wherein, f2 is the focal length of the second lens group, and f system is the system focal length of the camera lens, and TTL is that the optics of the camera lens is total
Long, Fno is the f-number of camera lens, and NL is number of lenses.
2. camera lens as described in claim 1, which is characterized in that first lens group includes being arranged successively by object side to image side
The first negative-power lenses, the second negative-power lenses, third negative-power lenses group, the first sub-lens group, the second positive light
Power lenses and the second sub-lens group；
The first sub-lens group includes the first positive power lens, or including the first positive power lens and the 4th negative power
Lens；
The second sub-lens group includes third positive power lens and the 5th negative-power lenses.
3. camera lens as claimed in claim 2, which is characterized in that first negative-power lenses include meniscus lens, described
In first negative-power lenses towards image side surface be concave surface；
Second negative-power lenses include meniscus lens, in second negative-power lenses towards image side surface be it is recessed
Face；
The third negative-power lenses include meniscus lens, in the third negative-power lenses towards image side surface be it is convex
Face, or including biconcave lens；
First positive power lens include biconvex lens；
4th negative-power lenses include meniscus lens, in the 4th negative-power lenses towards image side surface be it is convex
Face；
Second positive power lens include meniscus lens, in second positive power lens towards image side surface be it is recessed
Face；
The third positive power lens include biconvex lens；
5th negative-power lenses include meniscus lens, in the 5th negative-power lenses towards image side surface be it is convex
Face, or including biconcave lens.
4. camera lens as claimed in claim 2, which is characterized in that second lens group includes being arranged successively by object side to image side
Third sub-lens group, the 5th positive power lens and the 4th sub-lens group；
The third sub-lens group includes the 6th negative-power lenses and the 4th positive power lens；
The 4th sub-lens group includes the 7th negative-power lenses, the 6th positive power lens and the 8th negative-power lenses.
5. camera lens as claimed in claim 4, which is characterized in that the 6th negative-power lenses include biconcave lens；
4th positive power lens include biconvex lens；
5th positive power lens include biconvex lens；
7th negative-power lenses include meniscus lens, in the 7th negative-power lenses towards image side surface be it is recessed
Face；
6th positive power lens include biconvex lens；
8th negative-power lenses include meniscus lens, in the 8th negative-power lenses towards image side surface be it is convex
Face.
6. camera lens as claimed in claim 5, which is characterized in that the refractive index of second positive power lens is all larger than
1.90, the refractive index of the 5th positive power lens is all larger than 1.80.
7. camera lens as claimed in claim 5, which is characterized in that the third negative-power lenses, the first positive power lens,
Third positive power lens and the 6th positive power lens use low-dispersion material.
8. camera lens as claimed in claim 7, which is characterized in that the third negative-power lenses, the first positive power lens,
The Abbe number of third positive power lens and the 6th positive power lens is all larger than 60.
9. camera lens as described in claim 1, which is characterized in that be provided with filter between second lens group and the imaging surface
Mating plate.
10. camera lens as described in claim 1, which is characterized in that be provided between first lens group and the second lens group
Light bar.
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| CN201910615112.0A CN110412743B (en) | 2019-07-09 | 2019-07-09 | Lens |
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| JP2009116106A (en) * | 2007-11-07 | 2009-05-28 | Ricoh Opt Ind Co Ltd | Lens for projection and projection image display device |
| CN102043235A (en) * | 2009-10-14 | 2011-05-04 | 三星电子株式会社 | Zoom lens and image pickup device having the same |
| CN102096175A (en) * | 2009-11-30 | 2011-06-15 | 株式会社尼康 | Lens system and optical apparatus |
| CN102298197A (en) * | 2010-06-23 | 2011-12-28 | 株式会社尼康 | Imaging lens, optical apparatus equipped therewith and method for manufacturing imaging lens |
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