CN207473174U - Imaging lens system group - Google Patents
Imaging lens system group Download PDFInfo
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- CN207473174U CN207473174U CN201721066452.5U CN201721066452U CN207473174U CN 207473174 U CN207473174 U CN 207473174U CN 201721066452 U CN201721066452 U CN 201721066452U CN 207473174 U CN207473174 U CN 207473174U
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Abstract
This application discloses a kind of imaging lens system group, which is sequentially included along optical axis by object side to image side：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens is convex surface；The image side surface of third lens is convex surface；The image side surface of 4th lens is concave surface；First lens and third lens are respectively provided with positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power；Total effective focal length f of the imaging lens system group and Entry pupil diameters EPD of imaging lens system group meets f/EPD ＜ 1.5.
Description
Technical field
This application involves a kind of imaging lens system group, more specifically, this application involves a kind of large aperture including four lens,
The imaging lens system group of high brightness.
Background technology
As for example photosensitive coupling element (CCD) or Complimentary Metal-Oxide semiconductor element (CMOS) etc. commonly use photosensitive member
The raising of part performance and the reduction of size propose more the high image quality of optical imaging system and miniaturization that match
High requirement.
In order to meet the requirement of miniaturization, F-number Fno (total effective cokes of camera lens that existing imaging lens system group is usually configured
Entry pupil diameters away from/camera lens) 2.0 or more than 2.0, there is good optical property while realizing and minimizing.But
It is with the continuous development of the portable electronic products such as smart mobile phone, higher want is proposed to the imaging lens system group to match
Ask, particularly when for insufficient light (such as rainy days, dusk), hand shaking, this F-number Fno for 2.0 or 2.0 with
On imaging lens system group can not meet the imaging requirements of higher order.
Particularly, in infrared camera field, imaging lens system group also needs to have larger aperture while small size is ensured
And higher brightness, it just can ensure that preferred application of the infrared lens in fields such as detection, identifications.
Utility model content
This application provides be applicable to portable electronic product, can at least solve or part solve it is of the prior art
The imaging lens system group of above-mentioned at least one shortcoming.
On the one hand, this application provides a kind of imaging lens system group, the imaging lens system group along optical axis by object side to image side sequentially
Including：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens can be convex
Face；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens can have
There is positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power；Total effective focal length f of imaging lens system group
It can meet f/EPD ＜ 1.5 with the Entry pupil diameters EPD of imaging lens system group.
In one embodiment, the image side surface of the second lens can be concave surface, the radius of curvature R 3 of the second lens object side
It can meet 0.5 ＜ R3/R4 ＜ 1 with the radius of curvature R 4 of the second lens image side surface.
In one embodiment, the second lens can have positive light coke, and effective focal length f2 is total with imaging lens system group
Effective focal length f can meet 2 ＜ f2/f ＜ 8.
In one embodiment, total effective focal length f of the radius of curvature R 1 of the first lens object side and imaging lens system group
0.5 ＜ R1/f ＜ 1.2 can be met.
In one embodiment, the spacing distance T12 and the first lens of the first lens and the second lens on optical axis
Distance TTL can meet T12/TTL ＜ 0.2 on object side to the axis of imaging lens system composition image planes.
In one embodiment, the first lens in the center thickness CT1 on optical axis and third lens on optical axis
Heart thickness CT3 can meet 0.6 ＜ CT1/CT3 ＜ 1.3.
In one embodiment, the first lens on optical axis center thickness CT1, the second lens are in the center on optical axis
Thickness CT2 and third lens can meet 0.4 ＜ CT1/ (CT2+CT3) ＜ 0.9 in the center thickness CT3 on optical axis.
In one embodiment, the first lens, the second lens, third lens and the 4th lens are on optical axis
The summation ∑ CT of heart thickness and the object side of the first lens, which form distance TTL on the axis of image planes to imaging lens system, can meet ∑ CT/
TTL ＜ 0.6.
In one embodiment, at least one of the object side of the 4th lens and image side surface can have at least one anti-
Qu Dian.
In one embodiment, effective half bore DT42 of the 4th lens image side surface in imaging lens system composition image planes with having
The half ImgH of effect pixel region diagonal line length can meet 0.7 ＜ DT42/ImgH ＜ 1.
In one embodiment, effective half bore DT11 of the first lens object side in imaging lens system composition image planes with having
The half ImgH of effect pixel region diagonal line length can meet 0.5 ＜ DT11/ImgH ＜ 1.
In one embodiment, the intersection point of the second lens object side and optical axis is to effective half mouthful of the second lens object side
Distance SAG21 and second lens of the diameter vertex on optical axis can meet 0 ＜ SAG21/CT2 ＜ in the center thickness CT2 on optical axis
0.7。
In one embodiment, imaging lens system group may also include the infrared band being set between the 4th lens and imaging surface
Pass filter.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens can be convex surface；Third is saturating
At least one of the object side of mirror and image side surface can be convex surface；At least one of the object side of 4th lens and image side surface can
For concave surface；At least two in first lens, third lens and the 4th lens can have positive light coke；Second lens can have just
Focal power, effective focal length f2 and total effective focal length f of imaging lens system group can meet 2 ＜ f2/f ＜ 8.
In one embodiment, the first lens and third lens can have positive light coke.
In one embodiment, the image side surface of the 4th lens can be concave surface.
In one embodiment, the object side of the second lens can be convex surface, and image side surface can be concave surface.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens
For convex surface；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens are equal
There can be positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power.Wherein, the first lens object side
Effective half bore DT11 and imaging lens system composition image planes on the half ImgH of effective pixel area diagonal line length can meet 0.5 ＜
DT11/ImgH ＜ 1.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens
For convex surface；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens are equal
There can be positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power.Wherein, the second lens object side
The radius of curvature R 4 of 3 and second lens image side surface of radius of curvature R can meet 0.5 ＜ R3/R4 ＜ 1.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens
For convex surface；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens are equal
There can be positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power.Wherein, the 4th lens image side surface
Effective half bore DT42 and imaging lens system composition image planes on the half ImgH of effective pixel area diagonal line length can meet 0.7 ＜
DT42/ImgH ＜ 1.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens
For convex surface；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens are equal
There can be positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power.Wherein, the second lens object side
With the distance SAG21 and the second lens of effective half bore vertex of the intersection point of optical axis to the second lens object side on optical axis in light
Center thickness CT2 on axis can meet 0 ＜ SAG21/CT2 ＜ 0.7.
On the other hand, present invention also provides a kind of imaging lens system groups, and the imaging lens system group is along optical axis by object side to image side
Sequentially include：First lens, the second lens, third lens and the 4th lens.The object side of first lens and the second lens
For convex surface；The image side surface of third lens can be convex surface；The image side surface of 4th lens can be concave surface；First lens and third lens are equal
There can be positive light coke；Second lens and the 4th lens are respectively provided with positive light coke or negative power.Imaging lens system group may also include
The infrared band pass filter being set between the 4th lens and imaging surface.
The application employs such as four lens, by each power of lens of reasonable distribution, face type, each lens center
Spacing etc. on axis between thickness and each lens so that lens group has ultra-thin, small while good image quality is realized
At least one advantageous effect such as type, low sensitivity, large aperture, high brightness.
Description of the drawings
With reference to attached drawing, by the detailed description of following non-limiting embodiment, other features of the application, purpose and excellent
Point will be apparent.In the accompanying drawings：
Fig. 1 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 1；
Fig. 2A to Fig. 2 E respectively illustrates chromatic curve on the axis of the imaging lens system group of embodiment 1, astigmatism curve, distortion song
Line, ratio chromatism, curve and relative illumination curve；
Fig. 3 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 2；
Fig. 4 A to Fig. 4 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 2, astigmatism curve, distortion song
Line, ratio chromatism, curve and relative illumination curve；
Fig. 5 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 3；
Fig. 6 A to Fig. 6 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 3, astigmatism curve, distortion song
Line, ratio chromatism, curve and relative illumination curve；
Fig. 7 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 4；
Fig. 8 A to Fig. 8 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 4, astigmatism curve, distortion song
Line, ratio chromatism, curve and relative illumination curve；
Fig. 9 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 5；
Figure 10 A to Figure 10 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 5, astigmatism curve, distortion
Curve, ratio chromatism, curve and relative illumination curve；
Figure 11 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 6；
Figure 12 A to Figure 12 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 6, astigmatism curve, distortion
Curve, ratio chromatism, curve and relative illumination curve；
Figure 13 shows the structure diagram of the imaging lens system group according to the embodiment of the present application 7；
Figure 14 A to Figure 14 E respectively illustrate chromatic curve on the axis of the imaging lens system group of embodiment 7, astigmatism curve, distortion
Curve, ratio chromatism, curve and relative illumination curve.
Specific embodiment
Refer to the attached drawing is made more detailed description by the application in order to better understand to the various aspects of the application.It should
Understand, these are described in detail the only description to the illustrative embodiments of the application rather than limit the application in any way
Range.In the specification, the identical element of identical reference numbers.It states "and/or" and includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the statement of first, second, third, etc. is only used for a feature and another spy
Sign distinguishes, and does not indicate that any restrictions to feature.Therefore, in the case of without departing substantially from teachings of the present application, hereinafter
The first lens discussed are also known as the second lens or third lens.
In the accompanying drawings, for convenience of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing
Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape are not limited to attached drawing
In the spherical surface that shows or aspherical shape.Attached drawing is merely illustrative and and non-critical drawn to scale.
Herein, near axis area refers to the region near optical axis.If lens surface is convex surface and does not define convex surface position
When putting, then it represents that the lens surface is convex surface near axis area is less than；If lens surface is concave surface and does not define the concave surface position
When, then it represents that the lens surface is concave surface near axis area is less than.It is known as object side near the surface of object in each lens,
It is known as image side surface near the surface of imaging surface in each lens.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
Represent there is stated feature, element and/or component, but do not preclude the presence or addition of one or more when being used in bright book
Other feature, element, component and/or combination thereof.In addition, ought the statement of such as at least one of " ... " appear in institute
When after the list of row feature, the individual component in entire listed feature rather than modification list is modified.In addition, when describing this
During the embodiment of application, represented " one or more embodiments of the application " using "available".Also, term " illustrative "
It is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms used herein be respectively provided with (including technical terms and scientific words) with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) meaning consistent with their meanings in the context of the relevant technologies should be interpreted as having, and
It will not be explained with idealization or excessively formal sense, unless clearly so limiting herein.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The feature of the application, principle and other aspects are described in detail below.
Such as four lens with focal power are included according to the imaging lens system group of the application illustrative embodiments, that is,
First lens, the second lens, third lens and the 4th lens.This four lens are along optical axis from object side to image side sequential.
Imaging lens system group may also include the photosensitive element for being set to imaging surface, the effective pixel area diagonal of photosensitive element
Long half is ImgH.
First lens can have positive light coke, with larger refractive power, be conducive to shorten lens group entire length, subtract
Lenslet group volume.The object side of first lens can be convex surface, the radius of curvature R 1 of object side and always having for imaging lens system group
0.5 ＜ R1/f ＜ 1.2 can be met between effect focal length f, more specifically, R1 and f can further meet 0.58≤R1/f≤0.74.It is full
Sufficient 0.5 ＜ R1/f ＜ 1.2 of conditional, are conducive to shortening system overall length；Meanwhile increase system light-inletting quantity is also helped to be increased to
Reach the infrared luminous intensity of image planes.
Second lens have positive light coke or negative power, and object side can be convex surface, be conducive to balance off-axis aberration, carry
High imaging quality.Optionally, the second lens can have positive light coke, effective focal length f2 and total effective focal length of imaging lens system group
2 ＜ f2/f ＜ 8 can be met between f, more specifically, f2 and f can further meet 2.39≤f2/f≤7.19.Meet conditional 2
＜ f2/f ＜ 8 are conducive to system focal power and aberration balancing, shorten system overall length.
Optionally, the object side of the second lens can be convex surface, and image side surface can be concave surface.The curvature of second lens object side half
0.5 ＜ R3/R4 ＜ 1 can be met between the radius of curvature R 4 of diameter R3 and the second lens image side surface, more specifically, R3 and R4 are further
0.65≤R3/R4≤0.85 can be met.Meet 0.5 ＜ R3/R4 ＜ 1 of conditional, be conducive to disperse the first power of lens, from
And avoid leading to the first lens surface overbending due to focal power is excessively concentrated, manufacture difficulty is larger；Meanwhile meet conditional
0.5 ＜ R3/R4 ＜ 1 are also beneficial to increase system light-inletting quantity.
Third lens can have positive light coke, image side surface can be convex surface, such dispersion being disposed with conducive to focal power,
So as to reduce the angle of field rays and optical axis outside axis, and then improve the astigmatism problem of the outer visual field of axis.
4th lens have positive light coke or negative power, and image side surface is concave surface, such to be disposed with conducive to imaging surface
It is close to object side, so as to shorten system entire length, realize miniaturization.Optionally, in the object side and image side surface of the 4th lens
It is at least one have at least one point of inflexion.The object side of 4th lens or image side surface have at least one point of inflexion, can be with
The outer visual field light path of adjustment axis, reduces the surface incidence angle of the outer visual field of axis, while can reduce the coma and astigmatism of the outer visual field of axis.
In the application, the spacing distance the center thickness of each lens and each lens can be optimized, is taken the photograph with realizing
As the preferable optical property of lens group.
First lens can expire in the center thickness CT1 on optical axis and third lens between the center thickness CT3 on optical axis
0.6 ＜ CT1/CT3 ＜ 1.3 of foot, more specifically, CT1 and CT3 can further meet 0.67≤CT1/CT3≤1.24.Meet condition
0.6 ＜ CT1/CT3 ＜ 1.3 of formula, are conducive to decentralized system focal power, to avoid focal power concentrations in the first lens or third
On lens, so avoid concentrations due to focal power and caused by tolerance is sensitive and the concentrations due to focal power
Caused by and the problems such as lens surface overbending, difficult forming.
First lens on optical axis center thickness CT1, the second lens are in center thickness CT2 and third lens on optical axis
0.4 ＜ CT1/ (CT2+CT3) ＜ 0.9 can be met between the center thickness CT3 on optical axis, more specifically, CT1, CT2 and CT3
0.43≤CT1/ (CT2+CT3)≤0.73 can further be met.Meet conditional 0.4 ＜ CT1/ (CT2+CT3) ＜ 0.9, help
Relatively reasonable space layout is obtained in the first lens, the second lens, third lens, so as to be conducive to the dispersion of system focal power
With the processing and forming of eyeglass.
All lens with focal power are (when imaging lens system group includes four the lens with focal power in imaging lens system group
When, all lens with focal power refer to the first lens, the second lens, third lens and the 4th lens) respectively on optical axis
Center thickness summation ∑ CT and imaging lens system group optics total length TTL (that is, from the center of the first lens object side into
Distance on the axis of image planes) between can meet ∑ CT/TTL ＜ 0.6, more specifically, ∑ CT and TTL can further meet 0.46≤∑
CT/TTL≤0.51.Meet conditional ∑ CT/TTL ＜ 0.6, be conducive to shorten the entire length of lens group.Meanwhile increase each
Spacing distance between mirror is also beneficial to the tolerance sensitivity of reduction system, promoted the quality of lens group batch production with it is consistent
Property.
The optics total length TTL of the spacing distance T12 of first lens and the second lens on optical axis and imaging lens system group it
Between can meet T12/TTL ＜ 0.2, more specifically, T12 and TTL can further meet 0.06≤T12/TTL≤0.16.Meet item
Part formula T12/TTL ＜ 0.2, are conducive to compress the effective aperture of the second lens, and reducing glass packet size realizes small size performance.
The half of effective half bore DT11 of first lens object side and effective pixel area diagonal line length on imaging surface
0.5 ＜ DT11/ImgH ＜ 1 can be met between ImgH, more specifically, DT11 and ImgH can further meet 0.52≤DT11/
ImgH≤0.63.Meet 0.5 ＜ DT11/ImgH ＜ 1 of conditional, be conducive to shorten the entire length of lens group；At the same time it can also
So that system has larger light-inletting quantity, photosensitive element output signal-noise ratio is improved.
The half of effective half bore DT42 of 4th lens image side surface and effective pixel area diagonal line length on imaging surface
0.7 ＜ DT42/ImgH ＜ 1 can be met between ImgH, more specifically, DT42 and ImgH can further meet 0.83≤DT42/
ImgH≤0.99.Meet 0.7 ＜ DT42/ImgH ＜ 1 of conditional can to avoid because off-axis ray is by four lens when it is excessively steep
Tolerance that is high and steep and generating is sensitive；Meanwhile such arrangement also helps the miniaturization of lens group.
The object side of second lens and the intersection point of optical axis are to the axis between effective half bore vertex of the second lens object side
On distance SAG21 and the second lens can meet 0 ＜ SAG21/CT2 ＜ 0.7 between the center thickness CT2 on optical axis, more specifically
Ground, SAG21 and CT2 can further meet 0.15≤SAG21/CT2≤0.60.Meet 0 ＜ SAG21/CT2 ＜ 0.7 of conditional, have
Conducive to the effective aperture for reducing the second lens, so as to be conducive to the processing of eyeglass and molding.
It can meet f/EPD ＜ 1.5 between total effective focal length f of imaging lens system group and the Entry pupil diameters EPD of imaging lens system group,
More specifically, f and EPD can further meet 1.04≤f/EPD≤1.29.Meet conditional f/EPD ＜ 1.5, it can be effectively
The energy density in image planes is improved, so as to be conducive to improve image space sensor output signal-noise ratio.
Optionally, infrared band pass filter is may be provided between the 4th lens and imaging surface, it is infrared for being filtered through
Light caused by eliminating non-infrared light the problems such as aberration, image blur, that is, eliminates the signal interference that non-infrared light is brought.
In the exemplary embodiment, the imaging lens system group of the application may also include at least one diaphragm.Diaphragm can basis
Need any position being set between object side and image side.By the appropriate selection to stop position, can effectively correct with
The related aberration of diaphragm (for example, coma, astigmatism, distortion and axial chromatic aberration), to improve the image quality of camera lens.Optionally, light
Door screen may be disposed between object side and the first lens.Optionally, diaphragm may be disposed between the first lens and the second lens.
Optionally, above-mentioned imaging lens system group may also include the protection glass for protecting the photosensitive element being located on imaging surface
Glass.
Multi-disc eyeglass, such as described above four can be used according to the imaging lens system group of the above embodiment of the application
Piece.Pass through spacing on the axis between each power of lens of reasonable distribution, face type, the center thickness of each lens and each lens
Deng the volume that can effectively reduce lens group, the machinability for reducing the susceptibility of lens group and improving lens group so that camera shooting
Lens group is more advantageous to producing and processing and being applicable to portable electronic product.Meanwhile pass through the imaging lens system of above-mentioned configuration
Group also has the advantageous effect such as ultra-thin, large aperture, high brightness, high image quality.
In presently filed embodiment, at least one of minute surface of each lens is aspherical mirror.Non-spherical lens
The characteristics of be：From lens centre to lens perimeter, curvature is consecutive variations.It is constant with having from lens centre to lens perimeter
The spherical lens of curvature is different, and non-spherical lens has more preferably radius of curvature characteristic, and there is improvement to distort aberration and improve picture
The advantages of dissipating aberration.After non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, so as to improve
Image quality.In addition, the use of non-spherical lens can also efficiently reduce the lens number in optical system.
However, it will be understood by those of skill in the art that without departing from this application claims technical solution situation
Under, the lens numbers for forming imaging lens system group can be changed, to obtain each result and the advantage described in this specification.For example,
Although being described by taking four lens as an example in embodiments, which is not limited to include four lens.
If desired, the imaging lens system group may also include the lens of other quantity.
The specific embodiment for the imaging lens system group for being applicable to the above embodiment is further described with reference to the accompanying drawings.
Embodiment 1
Referring to Fig. 1 to Fig. 2 E descriptions according to the imaging lens system group of the embodiment of the present application 1.Fig. 1 is shown according to this Shen
Please embodiment 1 imaging lens system group structure diagram.
As shown in Figure 1, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is concave surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a positive light coke, and object side S7 is convex surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between object side and the first lens L1, it is saturating to promote camera shooting
The image quality of microscope group.
Table 1 shows surface type, radius of curvature, thickness, material and the circle of each lens of the imaging lens system group of embodiment 1
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 1
It can be obtained by table 1, the song of the image side surface S4 of the 3 and second lens L2 of radius of curvature R of the object side S3 of the second lens L2
Meet R3/R4=0.73 between rate radius R4；First lens L1 is in the center thickness CT1 on optical axis and third lens L3 in optical axis
On center thickness CT3 between meet CT1/CT3=0.82；First lens L1 is in center thickness CT1, the second lens on optical axis
L2 in the center thickness CT2 on optical axis and third lens L3 in the center thickness CT3 on optical axis meet CT1/ (CT2+CT3)=
0.52。
In embodiment 1, non-spherical lens can be used in each lens, and each aspherical face type x is limited by the following formula：
Wherein, x be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, paraxial curvature c is the inverse of 1 mean curvature radius R of upper table)；K for circular cone coefficient (
It has been provided in table 1)；Ai is the correction factor of aspherical i-th-th ranks.The following table 2 is given available for each aspherical in embodiment 1
The high order term coefficient A of minute surface S1-S84、A6、A8、A10、A12、A14And A16。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.6901E-02 | 1.3274E-02 | -2.1706E-02 | 2.5702E-02 | -1.9823E-02 | 4.9245E-03 | -1.0617E-04 |
| S2 | -4.2572E-02 | -3.0394E-02 | 1.0206E-02 | 1.1631E-02 | -1.5978E-02 | 4.9360E-03 | 1.8444E-04 |
| S3 | -1.8404E-01 | -2.2932E-02 | -1.9112E-01 | 1.8354E-01 | -4.8139E-02 | 1.0335E-03 | 4.3675E-04 |
| S4 | 2.3637E-02 | -1.3993E-01 | -1.5439E-01 | 2.7901E-01 | -1.6071E-01 | 3.9760E-02 | -3.2453E-03 |
| S5 | 1.8305E-01 | -3.5807E-01 | 4.7080E-01 | -4.3425E-01 | 2.4972E-01 | -8.9144E-02 | 1.4350E-02 |
| S6 | -4.8618E-01 | 1.2078E+00 | -1.8554E+00 | 1.7025E+00 | -9.0795E-01 | 2.5477E-01 | -2.8524E-02 |
| S7 | -3.3394E-02 | -5.2685E-02 | 4.0756E-02 | -1.1570E-02 | 1.6497E-03 | -1.1853E-04 | 3.2993E-06 |
| S8 | -1.3131E-01 | 7.0132E-02 | -3.0786E-02 | 8.3243E-03 | -1.2222E-03 | 8.6139E-05 | -2.3107E-06 |
Table 2
The following table 3 provides total effective focal length f of imaging lens system group in embodiment 1, the effective focal length f1 to f4 of each lens, camera shooting
The half ImgH of effective pixel area diagonal line length and the optics total length of imaging lens system group on the imaging surface S11 of lens group
TTL (that is, from distance on the center to the axis of imaging surface S11 of the object side S1 of the first lens L1).
Table 3
It can be obtained by upper table 1 and table 3, between the effective focal length f2 of the second lens L2 and total effective focal length f of imaging lens system group
Meet f2/f=2.56；Between the radius of curvature R 1 of the object side S1 of first lens L1 and total effective focal length f of imaging lens system group
Meet R1/f=0.74；The spacing distance T12 of first lens L1 and the second lens L2 on optical axis and the optics of imaging lens system group
Meet T12/TTL=0.06 between total length TTL；L4 points of first lens L1, the second lens L2, third lens L3 and the 4th lens
Σ CT/TTL=are not met between the summation Σ CT of the center thickness on optical axis and the optics total length TTL of imaging lens system group
0.48。
In embodiment 1, meet between total effective focal length f of imaging lens system group and the Entry pupil diameters EPD of imaging lens system group
F/EPD=1.12；Effective half bore DT11 of the object side S1 of first lens L1 with it is effective on the imaging surface S11 of imaging lens system group
Meet DT11/ImgH=0.61 between the half ImgH of pixel region diagonal line length；The image side surface S8's of 4th lens L4 is effective
Meet between the half ImgH of effective pixel area diagonal line length on the half bore DT42 and imaging surface S11 of imaging lens system group
DT42/ImgH=0.99；The object side S3 of second lens L2 and the intersection point of optical axis to the second lens L2 object side S3 it is effective
Distance SAG21 and the second lens L2 meet SAG21/ between the center thickness CT2 on optical axis on axis between half bore vertex
CT2=0.45.
Fig. 2A shows chromatic curve on the axis of the imaging lens system group of embodiment 1, represent the light of different wave length via
Converging focal point after lens group deviates.Fig. 2 B show the astigmatism curve of the imaging lens system group of embodiment 1, represent meridianal image surface
Bending and sagittal image surface bending.Fig. 2 C show the distortion curve of the imaging lens system group of embodiment 1, represent different visual angles situation
Under distortion sizes values.Fig. 2 D show the ratio chromatism, curve of the imaging lens system group of embodiment 1, represent light via lens
The deviation of different image heights after group on imaging surface.Fig. 2 E show the relative illumination curve of the imaging lens system group of embodiment 1,
It represents the relative illumination corresponding to different image heights on imaging surface.A to Fig. 2 E is it is found that camera shooting given by embodiment 1 according to fig. 2
Lens group can realize good image quality.
Embodiment 2
The imaging lens system group according to the embodiment of the present application 2 is described referring to Fig. 3 to Fig. 4 E.In the present embodiment and following
In embodiment, for brevity, by clipped description similar to Example 1.Fig. 3 is shown according to the embodiment of the present application 2
Imaging lens system group structure diagram.
As shown in figure 3, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is concave surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is convex surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between the first lens L1 and the second lens L2, to be promoted
The image quality of imaging lens system group.
Table 4 shows surface type, radius of curvature, thickness, material and the circle of each lens of the imaging lens system group of embodiment 2
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 5 is shown available for each aspherical in embodiment 2
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 6 is shown
Total effective focal length f of imaging lens system group in embodiment 2, the effective focal length f1 to f4 of each lens, imaging lens system group imaging surface
The half ImgH of the upper effective pixel area diagonal line length and optics total length TTL of imaging lens system group.
Table 4
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.0938E-02 | 7.1645E-03 | -1.2217E-02 | 1.5627E-02 | -1.8137E-02 | 8.1936E-03 | -1.5442E-03 |
| S2 | -3.7195E-02 | -2.5868E-03 | -2.0882E-02 | 8.3370E-03 | 6.8312E-03 | -7.9328E-03 | 2.2755E-03 |
| S3 | -1.7076E-01 | -8.0125E-02 | -1.5436E-01 | 1.9385E-01 | -7.2746E-02 | -2.3434E-02 | 2.2857E-02 |
| S4 | -6.5556E-03 | -1.2073E-01 | -1.5830E-01 | 3.0988E-01 | -1.9283E-01 | 3.1055E-02 | 6.8774E-03 |
| S5 | 1.2179E-01 | -3.3096E-01 | 4.7612E-01 | -4.4101E-01 | 2.3203E-01 | -7.9559E-02 | 1.5354E-02 |
| S6 | -6.3654E-01 | 1.5927E+00 | -2.7276E+00 | 2.8992E+00 | -1.8471E+00 | 6.3927E-01 | -9.0844E-02 |
| S7 | -3.9350E-02 | -1.9082E-03 | 1.0826E-02 | -3.9619E-03 | 6.4006E-04 | -4.8389E-05 | 1.3687E-06 |
| S8 | -8.5153E-02 | 3.7287E-02 | -1.2320E-02 | 1.9163E-03 | -1.0815E-04 | 0.0000E+00 | 0.0000E+00 |
Table 5
Table 6
Fig. 4 A show chromatic curve on the axis of the imaging lens system group of embodiment 2, represent the light of different wave length via
Converging focal point after lens group deviates.Fig. 4 B show the astigmatism curve of the imaging lens system group of embodiment 2, represent meridianal image surface
Bending and sagittal image surface bending.Fig. 4 C show the distortion curve of the imaging lens system group of embodiment 2, represent different visual angles situation
Under distortion sizes values.Fig. 4 D show the ratio chromatism, curve of the imaging lens system group of embodiment 2, represent light via lens
The deviation of different image heights after group on imaging surface.Fig. 4 E show the relative illumination curve of the imaging lens system group of embodiment 2,
It represents the relative illumination corresponding to different image heights on imaging surface.According to Fig. 4 A to Fig. 4 E it is found that camera shooting given by embodiment 2
Lens group can realize good image quality.
Embodiment 3
The imaging lens system group according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6 E.Fig. 5 is shown according to this
Apply for the structure diagram of the imaging lens system group of embodiment 3.
As shown in figure 5, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is convex surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is convex surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between the first lens L1 and the second lens L2, to be promoted
The image quality of imaging lens system group.
Table 7 shows surface type, radius of curvature, thickness, material and the circle of each lens of the imaging lens system group of embodiment 3
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 8 is shown available for each aspherical in embodiment 3
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 9 is shown
Total effective focal length f of imaging lens system group in embodiment 3, the effective focal length f1 to f4 of each lens, imaging lens system group imaging surface
The half ImgH of the upper effective pixel area diagonal line length and optics total length TTL of imaging lens system group.
Table 7
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.4003E-02 | -7.5346E-03 | -6.7209E-03 | 6.0803E-03 | -2.1473E-02 | 1.2364E-02 | -1.7349E-03 |
| S2 | -4.0073E-02 | -2.3053E-02 | -2.7752E-02 | 1.6195E-02 | 3.3039E-03 | -2.7646E-03 | 1.1259E-03 |
| S3 | -1.1578E-01 | -5.0949E-03 | -1.9019E-01 | 1.5170E-01 | -7.7018E-02 | 1.4587E-02 | 2.2859E-02 |
| S4 | 1.3480E-02 | -1.3969E-01 | -9.4474E-02 | 1.8379E-01 | -2.4467E-01 | 1.0573E-01 | 6.9279E-03 |
| S5 | 3.6031E-02 | -1.6504E-01 | 2.2961E-01 | -1.5991E-01 | 8.5202E-02 | -7.9465E-02 | 1.5351E-02 |
| S6 | -2.2493E-01 | 6.6619E-01 | -1.2917E+00 | 1.5860E+00 | -1.0110E+00 | 3.0611E-01 | -3.4677E-02 |
| S7 | -6.3749E-01 | 5.5138E-01 | -4.7617E-01 | 4.1691E-01 | -2.1333E-01 | 5.3312E-02 | -5.1217E-03 |
| S8 | -3.7089E-01 | 3.4114E-01 | -2.2096E-01 | 8.8733E-02 | -1.9355E-02 | 1.5132E-03 | 5.8720E-05 |
Table 8
Table 9
Fig. 6 A show chromatic curve on the axis of the imaging lens system group of embodiment 3, represent the light of different wave length via
Converging focal point after lens group deviates.Fig. 6 B show the astigmatism curve of the imaging lens system group of embodiment 3, represent meridianal image surface
Bending and sagittal image surface bending.Fig. 6 C show the distortion curve of the imaging lens system group of embodiment 3, represent different visual angles situation
Under distortion sizes values.Fig. 6 D show the ratio chromatism, curve of the imaging lens system group of embodiment 3, represent light via lens
The deviation of different image heights after group on imaging surface.Fig. 6 E show the relative illumination curve of the imaging lens system group of embodiment 3,
It represents the relative illumination corresponding to different image heights on imaging surface.According to Fig. 6 A to Fig. 6 E it is found that camera shooting given by embodiment 3
Lens group can realize good image quality.
Embodiment 4
The imaging lens system group according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8 E.Fig. 7 is shown according to this
Apply for the structure diagram of the imaging lens system group of embodiment 4.
As shown in fig. 7, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is concave surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is concave surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between the first lens L1 and the second lens L2, to be promoted
The image quality of imaging lens system group.
Table 10 show the surface types of each lens of the imaging lens system group of embodiment 4, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 11 is shown available for each non-in embodiment 4
The high order term coefficient of spherical mirror surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 12
Show total effective focal length f of imaging lens system group in embodiment 4, the effective focal length f1 to f4 of each lens, imaging lens system group into
The half ImgH of the effective pixel area diagonal line length and optics total length TTL of imaging lens system group in image planes.
Table 10
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.0810E-02 | 1.0243E-03 | -1.6939E-02 | 1.0342E-02 | -1.9783E-02 | 8.2773E-03 | -6.2554E-04 |
| S2 | -3.2809E-02 | -2.7210E-02 | -3.3706E-02 | 1.6401E-02 | 4.4599E-03 | -2.2500E-03 | 3.7039E-04 |
| S3 | -1.0678E-01 | -1.8130E-02 | -2.2494E-01 | 1.7703E-01 | -5.5672E-02 | 1.4802E-03 | 2.2862E-02 |
| S4 | 5.7671E-03 | -7.3940E-02 | -2.2723E-01 | 2.0698E-01 | -1.4686E-01 | 6.1850E-02 | 6.9281E-03 |
| S5 | 9.8829E-02 | -2.1919E-01 | 3.0444E-01 | -3.0595E-01 | 1.4302E-01 | -7.9465E-02 | 1.5354E-02 |
| S6 | 4.3080E-01 | -1.3389E+00 | 2.6886E+00 | -3.2470E+00 | 2.3066E+00 | -8.7430E-01 | 1.3442E-01 |
| S7 | -6.1033E-02 | -2.2569E-01 | 8.9914E-02 | 1.5523E-01 | -1.3379E-01 | 3.8682E-02 | -3.9081E-03 |
| S8 | -1.2317E-01 | -1.4640E-02 | 3.8021E-02 | -1.7027E-02 | 2.4742E-03 | 0.0000E+00 | 0.0000E+00 |
Table 11
Table 12
Fig. 8 A show chromatic curve on the axis of the imaging lens system group of embodiment 4, represent the light of different wave length via
Converging focal point after lens group deviates.Fig. 8 B show the astigmatism curve of the imaging lens system group of embodiment 4, represent meridianal image surface
Bending and sagittal image surface bending.Fig. 8 C show the distortion curve of the imaging lens system group of embodiment 4, represent different visual angles situation
Under distortion sizes values.Fig. 8 D show the ratio chromatism, curve of the imaging lens system group of embodiment 4, represent light via lens
The deviation of different image heights after group on imaging surface.Fig. 8 E show the relative illumination curve of the imaging lens system group of embodiment 4,
It represents the relative illumination corresponding to different image heights on imaging surface.According to Fig. 8 A to Fig. 8 E it is found that camera shooting given by embodiment 4
Lens group can realize good image quality.
Embodiment 5
The imaging lens system group according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10 E.Fig. 9 is shown according to this
Apply for the structure diagram of the imaging lens system group of embodiment 5.
As shown in figure 9, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is concave surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is convex surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between object side and the first lens L1, it is saturating to promote camera shooting
The image quality of microscope group.
Table 13 show the surface types of each lens of the imaging lens system group of embodiment 5, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 14 is shown available for each non-in embodiment 5
The high order term coefficient of spherical mirror surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 15
Show total effective focal length f of imaging lens system group in embodiment 5, the effective focal length f1 to f4 of each lens, imaging lens system group into
The half ImgH of the effective pixel area diagonal line length and optics total length TTL of imaging lens system group in image planes.
Table 13
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.3250E-02 | 1.2893E-02 | -2.4007E-02 | 2.7438E-02 | -1.7763E-02 | 4.3274E-03 | -2.7176E-04 |
| S2 | -3.4032E-02 | -2.8793E-02 | 6.9575E-03 | 1.3506E-02 | -1.4905E-02 | 4.8235E-03 | -2.7185E-04 |
| S3 | -1.4642E-01 | -7.2124E-03 | -1.9899E-01 | 1.8037E-01 | -4.8210E-02 | 1.2564E-03 | 7.9764E-04 |
| S4 | 4.1497E-02 | -1.2358E-01 | -1.7354E-01 | 2.7747E-01 | -1.5679E-01 | 4.1506E-02 | -4.2489E-03 |
| S5 | 2.0810E-01 | -3.4503E-01 | 4.5713E-01 | -4.2868E-01 | 2.5249E-01 | -8.7983E-02 | 1.3033E-02 |
| S6 | -5.2762E-01 | 1.2566E+00 | -1.7746E+00 | 1.5308E+00 | -7.7402E-01 | 2.0696E-01 | -2.2267E-02 |
| S7 | 2.5820E-03 | -6.0664E-02 | 3.6590E-02 | -9.2093E-03 | 1.1785E-03 | -7.5594E-05 | 1.8882E-06 |
| S8 | -1.6514E-01 | 8.7381E-02 | -3.3765E-02 | 7.9195E-03 | -1.0446E-03 | 6.8360E-05 | -1.7249E-06 |
Table 14
Table 15
Figure 10 A show chromatic curve on the axis of the imaging lens system group of embodiment 5, represent the light of different wave length via
Converging focal point after lens group deviates.Figure 10 B show the astigmatism curve of the imaging lens system group of embodiment 5, represent meridian picture
Face is bent and sagittal image surface bending.Figure 10 C show the distortion curve of the imaging lens system group of embodiment 5, represent different visual angles
In the case of distortion sizes values.Figure 10 D show the ratio chromatism, curve of the imaging lens system group of embodiment 5, represent light warp
By the deviation of the different image heights after lens group on imaging surface.Figure 10 E show contrasting for the imaging lens system group of embodiment 5
It writes music line, represents the relative illumination corresponding to different image heights on imaging surface.According to Figure 10 A to Figure 10 E it is found that 5 institute of embodiment
The imaging lens system group provided can realize good image quality.
Embodiment 6
The imaging lens system group according to the embodiment of the present application 6 is described referring to Figure 11 to Figure 12 E.Figure 11 shows basis
The structure diagram of the imaging lens system group of the embodiment of the present application 6.
As shown in figure 11, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is concave surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is convex surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between object side and the first lens L1, it is saturating to promote camera shooting
The image quality of microscope group.
Table 16 show the surface types of each lens of the imaging lens system group of embodiment 6, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 17 is shown available for each non-in embodiment 6
The high order term coefficient of spherical mirror surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 18
Show total effective focal length f of imaging lens system group in embodiment 6, the effective focal length f1 to f4 of each lens, imaging lens system group into
The half ImgH of the effective pixel area diagonal line length and optics total length TTL of imaging lens system group in image planes.
Table 16
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.3376E-02 | 1.4573E-02 | -2.2897E-02 | 2.4319E-02 | -2.0369E-02 | 4.9972E-03 | -1.1594E-03 |
| S2 | -4.4366E-02 | -3.2311E-02 | 6.8656E-03 | 7.2142E-03 | -1.8982E-02 | 4.2358E-03 | 2.6175E-03 |
| S3 | -2.0009E-01 | -2.6864E-02 | -1.9719E-01 | 1.8329E-01 | -4.5768E-02 | 3.0644E-03 | 2.6472E-03 |
| S4 | -1.0260E-02 | -1.2812E-01 | -1.4368E-01 | 2.7669E-01 | -1.6475E-01 | 3.8160E-02 | -9.7948E-04 |
| S5 | 1.5229E-01 | -3.5551E-01 | 4.6689E-01 | -4.3870E-01 | 2.4806E-01 | -8.9129E-02 | 1.5086E-02 |
| S6 | -4.0351E-01 | 9.4437E-01 | -1.6404E+00 | 1.7659E+00 | -1.1170E+00 | 3.7355E-01 | -4.9949E-02 |
| S7 | -2.0898E-01 | 6.1476E-02 | 1.8665E-02 | -1.3512E-02 | 3.0181E-03 | -3.0840E-04 | 1.1550E-05 |
| S8 | -1.7771E-01 | 1.0531E-01 | -5.0484E-02 | 1.5890E-02 | -2.7568E-03 | 2.2769E-04 | -7.1017E-06 |
Table 17
Table 18
Figure 12 A show chromatic curve on the axis of the imaging lens system group of embodiment 6, represent the light of different wave length via
Converging focal point after lens group deviates.Figure 12 B show the astigmatism curve of the imaging lens system group of embodiment 6, represent meridian picture
Face is bent and sagittal image surface bending.Figure 12 C show the distortion curve of the imaging lens system group of embodiment 6, represent different visual angles
In the case of distortion sizes values.Figure 12 D show the ratio chromatism, curve of the imaging lens system group of embodiment 6, represent light warp
By the deviation of the different image heights after lens group on imaging surface.Figure 12 E show contrasting for the imaging lens system group of embodiment 6
It writes music line, represents the relative illumination corresponding to different image heights on imaging surface.According to Figure 12 A to Figure 12 E it is found that 6 institute of embodiment
The imaging lens system group provided can realize good image quality.
Embodiment 7
The imaging lens system group according to the embodiment of the present application 7 is described referring to Figure 13 to Figure 14 E.Figure 13 shows basis
The structure diagram of the imaging lens system group of the embodiment of the present application 7.
As shown in figure 13, imaging lens system group sequentially includes the first lens L1, the second lens by object side along optical axis into image side
L2, third lens L3, the 4th lens L4 and imaging surface S11.Imaging lens system group may also include the photosensitive member for being set to imaging surface S11
Part.
First lens L1 has a positive light coke, and object side S1 is convex surface, and image side surface S2 is concave surface, and the first lens L1
Object side S1 and image side surface S2 is aspherical.
Second lens L2 has a positive light coke, and object side S3 is convex surface, and image side surface S4 is concave surface, and the second lens L2
Object side S3 and image side surface S4 is aspherical.
Third lens L3 has a positive light coke, and object side S5 is convex surface, and image side surface S6 is convex surface, and third lens L3
Object side S5 and image side surface S6 is aspherical.
4th lens L4 has a negative power, and object side S7 is concave surface, and image side surface S8 is concave surface, and the 4th lens L4
Object side S7 and image side surface S8 is aspherical.
Optionally, imaging lens system group may also include the optical filter L5 with object side S9 and image side surface S10.Optical filter L5 can
For infrared band pass filter.Light from object sequentially passes through each surface S1 to S10 and is ultimately imaged on imaging surface S11.
Optionally, the diaphragm STO for limiting light beam can be set between the first lens L1 and the second lens L2, to be promoted
The image quality of imaging lens system group.
Table 19 show the surface types of each lens of the imaging lens system group of embodiment 7, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).Table 20 is shown available for each non-in embodiment 7
The high order term coefficient of spherical mirror surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.Table 21
Show total effective focal length f of imaging lens system group in embodiment 7, the effective focal length f1 to f4 of each lens, imaging lens system group into
The half ImgH of the effective pixel area diagonal line length and optics total length TTL of imaging lens system group in image planes.
Table 19
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -1.0082E-02 | -1.3226E-02 | 2.9056E-03 | 6.9244E-03 | -3.1481E-02 | 2.1629E-02 | -5.1705E-03 |
| S2 | -2.4608E-02 | 2.0413E-03 | -2.4382E-02 | -1.4647E-02 | -1.0636E-02 | 5.0419E-02 | -2.5124E-02 |
| S3 | 2.3108E-02 | -4.9641E-02 | -2.4065E-01 | 2.4119E-01 | 1.8248E-02 | -6.8138E-02 | 2.2980E-02 |
| S4 | -7.2907E-02 | -3.6797E-02 | -1.1042E-01 | 1.7116E-01 | -2.1745E-01 | 1.2981E-01 | 1.4286E-02 |
| S5 | 7.8851E-02 | -1.0625E-01 | 1.0834E-01 | -2.3351E-01 | 1.7066E-01 | -7.9201E-02 | 1.5354E-02 |
| S6 | -8.7334E-02 | 1.2519E-01 | -5.9275E-02 | 8.5334E-03 | -5.6340E-04 | 1.7758E-05 | -2.1705E-07 |
| S7 | -1.6032E-02 | -6.5518E-01 | 8.5780E-01 | -4.8134E-01 | 1.4193E-01 | -2.1562E-02 | 1.3338E-03 |
| S8 | -2.0882E-01 | 4.6067E-02 | 3.2161E-02 | -2.3506E-02 | 3.8837E-03 | 0.0000E+00 | 0.0000E+00 |
Table 20
Table 21
Figure 14 A show chromatic curve on the axis of the imaging lens system group of embodiment 7, represent the light of different wave length via
Converging focal point after lens group deviates.Figure 14 B show the astigmatism curve of the imaging lens system group of embodiment 7, represent meridian picture
Face is bent and sagittal image surface bending.Figure 14 C show the distortion curve of the imaging lens system group of embodiment 7, represent different visual angles
In the case of distortion sizes values.Figure 14 D show the ratio chromatism, curve of the imaging lens system group of embodiment 7, represent light warp
By the deviation of the different image heights after lens group on imaging surface.Figure 14 E show contrasting for the imaging lens system group of embodiment 7
It writes music line, represents the relative illumination corresponding to different image heights on imaging surface.According to Figure 14 A to Figure 14 E it is found that 7 institute of embodiment
The imaging lens system group provided can realize good image quality.
To sum up, embodiment 1 to embodiment 7 meets the relationship shown in following table 22 respectively.
| Conditional embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| f/EPD | 1.12 | 1.20 | 1.24 | 1.24 | 1.04 | 1.29 | 1.24 |
| R3/R4 | 0.73 | 0.85 | 0.66 | 0.65 | 0.69 | 0.75 | 0.77 |
| f2/f | 2.56 | 4.69 | 2.85 | 2.74 | 2.39 | 2.98 | 7.19 |
| R1/f | 0.74 | 0.71 | 0.62 | 0.58 | 0.74 | 0.67 | 0.62 |
| T12/TTL | 0.06 | 0.08 | 0.11 | 0.11 | 0.06 | 0.06 | 0.16 |
| CT1/CT3 | 0.82 | 0.80 | 1.10 | 1.22 | 1.12 | 0.67 | 1.24 |
| CT1/(CT2+CT3) | 0.52 | 0.53 | 0.62 | 0.67 | 0.65 | 0.43 | 0.73 |
| ∑CT/TTL | 0.48 | 0.51 | 0.46 | 0.46 | 0.50 | 0.47 | 0.48 |
| DT11/ImgH | 0.61 | 0.60 | 0.57 | 0.57 | 0.63 | 0.52 | 0.57 |
| DT42/ImgH | 0.99 | 0.95 | 0.84 | 0.83 | 0.99 | 0.99 | 0.84 |
| SAG21/CT2 | 0.45 | 0.30 | 0.60 | 0.58 | 0.43 | 0.15 | 0.17 |
Table 22
The application also provides a kind of photographic device, and electronics photosensitive element can be photosensitive coupling element (CCD) or complementation
Property matal-oxide semiconductor element (CMOS).Photographic device can be the independent picture pick-up device of such as digital camera or
The photographing module being integrated on the mobile electronic devices such as mobile phone.The photographic device is equipped with imaging lens system described above
Group.
The preferred embodiment and the explanation to institute's application technology principle that above description is only the application.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology that the specific combination of above-mentioned technical characteristic forms
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
The other technical solutions for arbitrarily combining and being formed.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical solution that the technical characteristic of energy is replaced mutually and formed.
Claims (27)
1. imaging lens system group is sequentially included along optical axis by object side to image side：First lens, the second lens, third lens and the 4th
Lens, which is characterized in that
The object side of first lens and second lens is convex surface；
The image side surface of the third lens is convex surface；
The image side surface of 4th lens is concave surface, and at least one of the object side of the 4th lens and image side surface have
At least one point of inflexion；
First lens and the third lens are respectively provided with positive light coke；
Second lens and the 4th lens are respectively provided with positive light coke or negative power；
Total effective focal length f of the imaging lens system group and Entry pupil diameters EPD of the imaging lens system group meets f/EPD ＜ 1.5.
2. imaging lens system group according to claim 1, which is characterized in that the image side surface of second lens be concave surface, institute
It states the radius of curvature R 3 of the second lens object side and meets 0.5 ＜ R3/R4 ＜ with the radius of curvature R 4 of the second lens image side surface
1。
3. imaging lens system group according to claim 1 or 2, which is characterized in that second lens have positive light coke,
Effective focal length f2 and total effective focal length f of the imaging lens system group meet 2 ＜ f2/f ＜ 8.
4. imaging lens system group according to claim 1, which is characterized in that the radius of curvature R 1 of the first lens object side
Meet 0.5 ＜ R1/f ＜ 1.2 with total effective focal length f of the imaging lens system group.
5. according to the imaging lens system group described in any one of claim 1,2 or 4, which is characterized in that first lens and institute
It states spacing distance T12 of second lens on the optical axis and object side to the imaging lens system of first lens forms picture
Distance TTL meets T12/TTL ＜ 0.2 on the axis in face.
6. imaging lens system group according to claim 1, which is characterized in that first lens are in the center on the optical axis
Thickness CT1 meets 0.6 ＜ CT1/CT3 ＜ 1.3 with the third lens in the center thickness CT3 on the optical axis.
7. imaging lens system group according to claim 1, which is characterized in that first lens are in the center on the optical axis
Thickness CT1, second lens are in the center thickness CT2 on the optical axis and the third lens on the optical axis
Heart thickness CT3 meets 0.4 ＜ CT1/ (CT2+CT3) ＜ 0.9.
8. according to the imaging lens system group described in any one of claim 1,6 or 7, which is characterized in that first lens, described
Second lens, the third lens and the 4th lens respectively at the center thickness on the optical axis summation ∑ CT with it is described
Distance TTL meets ∑ CT/TTL ＜ 0.6 on the object side of first lens to the axis of imaging lens system composition image planes.
9. imaging lens system group according to claim 1, which is characterized in that effective half bore of the first lens object side
The half ImgH of DT11 and effective pixel area diagonal line length in imaging lens system composition image planes meet 0.5 ＜ DT11/ImgH
＜ 1.
10. the imaging lens system group according to claim 1 or 9, which is characterized in that effectively the half of the 4th lens image side surface
Bore DT42 and the half ImgH of effective pixel area diagonal line length in imaging lens system composition image planes meet 0.7 ＜ DT42/
ImgH ＜ 1.
11. imaging lens system group according to claim 1 or 2, which is characterized in that the second lens object side and the light
The intersection point of axis to the second lens object side distance SAG21 and described second of effective half bore vertex on the optical axis
Lens meet 0 ＜ SAG21/CT2 ＜ 0.7 in the center thickness CT2 on the optical axis.
12. imaging lens system group according to claim 5, which is characterized in that the imaging lens system group, which further includes, is set to institute
State the infrared band pass filter between the 4th lens and the imaging surface.
13. imaging lens system group is sequentially included along optical axis by object side to image side：First lens, the second lens, third lens and the 4th
Lens, which is characterized in that
The object side of first lens is convex surface；
At least one of the object side of the third lens and image side surface are convex surface；
At least one of the object side of 4th lens and image side surface are concave surface, and the object side of the 4th lens and picture
At least one of side has at least one point of inflexion；
At least two in first lens, the third lens and the 4th lens have positive light coke；
Second lens have positive light coke, and effective focal length f2 and total effective focal length f of the imaging lens system group meet 2 ＜
F2/f ＜ 8.
14. imaging lens system group according to claim 13, which is characterized in that first lens and the third lens are equal
With positive light coke.
15. imaging lens system group according to claim 14, which is characterized in that first lens are on the optical axis
Heart thickness CT1 meets 0.6 ＜ CT1/CT3 ＜ 1.3 with the third lens in the center thickness CT3 on the optical axis.
16. imaging lens system group according to claim 14, which is characterized in that first lens are on the optical axis
Heart thickness CT1, second lens are in the center thickness CT2 on the optical axis and the third lens on the optical axis
Center thickness CT3 meets 0.4 ＜ CT1/ (CT2+CT3) ＜ 0.9.
17. imaging lens system group according to claim 13, which is characterized in that first lens, second lens, institute
State the summation ∑ CT and first lens of third lens and the 4th lens respectively at the center thickness on the optical axis
Distance TTL meets ∑ CT/TTL ＜ 0.6 on object side to the axis of imaging lens system composition image planes.
18. imaging lens system group according to claim 17, which is characterized in that first lens and second lens exist
Spacing distance T12 on the optical axis and distance on the object side to the axis of imaging lens system composition image planes of first lens
TTL meets T12/TTL ＜ 0.2.
19. imaging lens system group according to claim 13, which is characterized in that the image side surface of the 4th lens is concave surface.
20. imaging lens system group according to claim 19, which is characterized in that effective half mouthful of the 4th lens image side surface
Diameter DT42 and the half ImgH of effective pixel area diagonal line length in imaging lens system composition image planes meet 0.7 ＜ DT42/
ImgH ＜ 1.
21. imaging lens system group according to claim 13, which is characterized in that effective half mouthful of the first lens object side
Diameter DT11 and the half ImgH of effective pixel area diagonal line length in imaging lens system composition image planes meet 0.5 ＜ DT11/
ImgH ＜ 1.
22. imaging lens system group according to claim 13, which is characterized in that the object side of second lens is convex surface,
Image side surface is concave surface.
23. imaging lens system group according to claim 22, which is characterized in that the radius of curvature of the second lens object side
The radius of curvature R 4 of R3 and the second lens image side surface meet 0.5 ＜ R3/R4 ＜ 1.
24. imaging lens system group according to claim 22, which is characterized in that the second lens object side and the optical axis
Intersection point to the second lens object side distance SAG21 of effective half bore vertex on the optical axis with described second thoroughly
Mirror meets 0 ＜ SAG21/CT2 ＜ 0.7 in the center thickness CT2 on the optical axis.
25. imaging lens system group according to claim 13, which is characterized in that the radius of curvature of the first lens object side
R1 and total effective focal length f of the imaging lens system group meet 0.5 ＜ R1/f ＜ 1.2.
26. imaging lens system group according to claim 25, which is characterized in that total effective focal length f of the imaging lens system group
Meet f/EPD ＜ 1.5 with the Entry pupil diameters EPD of the imaging lens system group.
27. according to the imaging lens system group described in any one of claim 17,18,20 or 21, which is characterized in that the camera shooting is saturating
Microscope group further includes the infrared band pass filter being set between the 4th lens and the imaging surface.
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| CN201721066452.5U CN207473174U (en) | 2017-08-24 | 2017-08-24 | Imaging lens system group |
| PCT/CN2018/080106 WO2019037420A1 (en) | 2017-08-24 | 2018-03-23 | Camera lens group |
| US16/231,092 US11137571B2 (en) | 2017-08-24 | 2018-12-21 | Camera lens assembly |
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| CN201721066452.5U CN207473174U (en) | 2017-08-24 | 2017-08-24 | Imaging lens system group |
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