CN105259642B - A kind of phtographic lens and image capture device - Google Patents
A kind of phtographic lens and image capture device Download PDFInfo
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- CN105259642B CN105259642B CN201510823860.XA CN201510823860A CN105259642B CN 105259642 B CN105259642 B CN 105259642B CN 201510823860 A CN201510823860 A CN 201510823860A CN 105259642 B CN105259642 B CN 105259642B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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Abstract
The application provides a kind of phtographic lens and image capture device, the phtographic lens successively includes: diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface with same central axis by the direction of object side to image side along optical axis, by the way that the setting parameter of the pick-up lens is rationally arranged, it is made to meet relationshipSo that the phtographic lens has biggish aperture, so that light-inletting quantity increases when acquiring image in the environment of dark, to improve image quality.
Description
Technical field
The present invention relates to imaging device technical fields, more specifically to a kind of phtographic lens and image capture device.
Background technique
In recent years, with the continuous progress of science and technology, the integrated level of digital electric equipment it is also higher and higher, mobile phone, digital phase
The photographic equipments such as machine become more compact, frivolous, portable, and phtographic lens has become must not in the intelligent terminals such as mobile phone, PDA
The optical module that can lack, when Image Acquisition is carried out in the case where dark using phtographic lens in the prior art, imaging
Quality is lower, therefore, how to provide that a kind of also the phtographic lens of imaging with high quality becomes in the case where insufficient light
Those skilled in the art's one of the technical problems that are urgent to solve.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of phtographic lens and image capture device, to provide one kind in light
Also there is the phtographic lens of the imaging of better quality in insufficient situation.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of phtographic lens successively includes: by the direction of object side to image side along optical axis
Diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging with same central axis
Face；
First lens have positive light coke, and the object side surface and image side surface of first lens are convex surface knot
Structure；
Second lens have negative power, and the image side surface of second lens is concave structure；
The third lens have positive light coke, and the object side surface of the third lens is concave structure, image side surface is
Convex configuration；
4th lens have negative power, and the 4th lens are meniscus, and the object of the 4th lens
Side surface is convex surface, image side surface is concave surface, and the two sides of the 4th lens are wavy；
First lens, the second lens, the object side surface of the third lens and the 4th lens and image side surface are aspheric
Face structure；
The setting parameter of phtographic lens meets relational expression:
Wherein, the EPD is the entrance pupil aperture of the phtographic lens, and F is the effective focal length of the phtographic lens, described
FOV is the field angle of the phtographic lens.
Preferably, in phtographic lens described above, the setting parameter of the phtographic lens also meets in following relationship
Any one or any combination:
1.3 ﹤ TTL/F ﹤ 1.4；
0.8<(IMA/2)/F<0.85；
-4<f2/f3<-3.5；
1.8<(R5+R6)/(R5-R6)<2.0；
Wherein, the TTL is the overall length of the phtographic lens, and the IMA is the image height of the phtographic lens, and the f2 is
The focal length of second lens, the f3 are the focal length of the third lens, and the R5 is the second lens object side surface
Radius of curvature, the R6 are the radius of curvature on second lens image side surface.
Preferably, in phtographic lens described above, the setting parameter of the phtographic lens also meets in following relationship
Any one or any combination:
0.43<D4/E4<1.28；
Vd2>22 and Vd4<55；
1.5<n1&n3&n4<1.6；
Wherein, the D4 is the 4th lens in the thickness on optical axis, and the E4 is the 4th lens on off axis
Thickness；The Vd2 is the Abbe number of second lens, and the Vd4 is the Abbe number of the 4th lens, and the n1 is institute
The refractive index of the first lens is stated, the n3 is the refractive index of the third lens, and the n4 is the refractive index of the 4th lens.
Preferably, in phtographic lens described above, the setting parameter of the phtographic lens also meets in following relationship
Any one or any combination:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3 ﹤ n3-n4 ﹤ 0.4；
Wherein, the D2 is second lens in the thickness on optical axis, and the E2 is second lens on off axis
Thickness, the f3 be the third lens focal length, the f4 be the 4th focal length of lens, the n3 be the third lens
Refractive index, the n4 be the 4th lens refractive index.
Preferably, in phtographic lens described above, the setting parameter of the phtographic lens also meets in following relationship
Any one or any combination:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4 ﹤ f3/F ﹤ 0.5；
Wherein, the D3 is the third lens in the thickness on optical axis, and the E3 is the third lens on off axis
Thickness, Vd2 is the Abbe number of second lens, and the Vd3 is the Abbe number of the third lens, and the f3 is described the
The focal length of three lens.
Preferably, in phtographic lens described above, the setting parameter of the phtographic lens also meets in following relationship
Any one or any combination:
TL1A1-L4A4/ BFL < 2.15；
T12=T34；
E3 ﹤ E1 ﹤ E2 ﹤ E4；
Wherein, the TL1A1-L4A4It is located at the central point of optical axis to the described 4th thoroughly for the object side surface of first lens
The image side surface of mirror is located at the distance of the central point on optical axis, and the BFL is that the image side surface of the 4th lens is located in optical axis
For heart point to the vertical range of the imaging surface, the T12 is first lens and interval of second lens on optical axis
Distance, the T34 are the third lens and spacing distance of the 4th lens on optical axis, and the E3 is that the third is saturating
Thickness of the mirror on off-axis, the thickness that the E1 is first lens on off-axis, E2 are second lens on off-axis
Thickness, the thickness that E4 is the 4th lens on off-axis.
Preferably, in phtographic lens described above, first lens, the second lens, the third lens and the 4th lens
Material is resin.
A kind of image capture device, using there is phtographic lens described in above-mentioned any one.
Preferably, described image acquisition equipment is mobile phone, PDA, camera or computer.
Based on the above-mentioned technical proposal, phtographic lens provided in an embodiment of the present invention, by the way that the pick-up lens is rationally arranged
Setting parameter, so that it is met relationshipSo that the phtographic lens tool
There is biggish aperture, so that light-inletting quantity increases when acquiring image in the environment of dark, to improve into image quality
Amount.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of phtographic lens disclosed in the embodiment of the present application；
Fig. 2 is the curvature of field and distortion figure tested phtographic lens disclosed in the embodiment of the present application two；
Fig. 3 is the spherical aberration figure tested phtographic lens disclosed in the embodiment of the present application two；
Fig. 4 is a kind of structural schematic diagram of phtographic lens disclosed in application embodiment three；
Fig. 5 is the curvature of field and distortion figure tested phtographic lens disclosed in the embodiment of the present application three；
Fig. 6 is the spherical aberration figure tested phtographic lens disclosed in the embodiment of the present application three；
Fig. 7 is a kind of structural schematic diagram of phtographic lens disclosed in application example IV；
Fig. 8 is the curvature of field and distortion figure tested phtographic lens disclosed in the embodiment of the present application four；
Fig. 9 is the spherical aberration figure tested phtographic lens disclosed in the embodiment of the present application four；
Figure 10 is a kind of structural schematic diagram of phtographic lens disclosed in application embodiment five；
Figure 11 is the curvature of field and distortion figure tested phtographic lens disclosed in the embodiment of the present application five；
Figure 12 is the spherical aberration figure tested phtographic lens disclosed in the embodiment of the present application five.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
The application passes through the study found that when taking pictures in the case where insufficient light, the effect for the image shot with
The F number of the phtographic lens is related, and the F number is smaller, aperture is bigger, and the light for entering sensor by camera lens is more,
Light-inletting quantity is more, and imaging is also just brighter, therefore, can effectively improve the light levels of shooting picture by reducing the F number.
In view of this, referring to Fig. 1, the application is provided with a kind of phtographic lens, and the camera lens is along optical axis by object side to image side
Direction successively includes:
Diaphragm 00, the first lens 10, the second lens 20, the third lens 30, the 4th lens 40, filter with same central axis
Mating plate 50 and imaging surface 60；
First lens 10 are the lens with positive light coke, the object side surface and image side surface of first lens 10
It is convex configuration；
Second lens 20 are the lens with negative power, and the image side surface of second lens 20 is concave surface knot
Structure；
The third lens 30 are the lens with positive light coke, and the object side surface of the third lens 30 is concave surface knot
Structure, image side surface are convex configuration；
4th lens 40 are the lens with negative power, and the surface of the 4th lens 40 is non-spherical structure,
4th lens 40 are meniscus, and the object side surface of the 4th lens 40 is convex surface, image side surface is concave surface, and
The two sides of 4th lens 40 are wavy；
The setting parameter of phtographic lens meets relational expression:
Wherein, the EPD is the entrance pupil aperture of the phtographic lens, and F is the effective focal length of the phtographic lens, described
FOV is the field angle of the phtographic lens.
Made referring to scheme disclosed in the above embodiments of the present application by the way that the setting parameter of the pick-up lens is rationally arranged
It meets relationship 0.1 < (EPD/F) × tgFOV √ (F/100) < 0.5, so that the phtographic lens meets normal distribution side in imaging
On the basis of formula, F coefficient reduces as far as possible, so that light-inletting quantity increases when acquiring image in the environment of dark
It is more, to improve image quality.
Wherein, it is obtained through overtesting, the photographic mirror obtained using Technical Design disclosed in the above embodiments of the present application
The F number of head can achieve 2.0 and hereinafter, its much smaller than conventional radiography camera lens in the prior art F number (2.4,2.6 and 2.8), because
This its imaging effect is also just much better than phtographic lens conventional in the prior art.
It is understood that user can focus according to the position where object, the focusing when carrying out Image Acquisition
The size of amount directly affects the Experience Degree of user, therefore user uses for convenience, and the application is also described through reasonable settings
The setting parameter of phtographic lens makes it have biggish focusing amount, closes specifically, the setting parameter of the phtographic lens meets
System: 1.3 ﹤ TTL/F ﹤ 1.4, wherein the TTL is the overall length of the phtographic lens.
It is understood that the size of the field angle of the phtographic lens determines the field range of the phtographic lens,
Field angle is bigger, and the visual field is bigger, and the visual field of imaging is also just all the more open, therefore the application also passes through the photography is rationally arranged
The setting parameter of camera lens, increases its field angle as far as possible, specifically, the setting parameter of the phtographic lens meets relationship:
0.8 < (IMA/2)/F < 0.85, wherein the IMA is the image height of the phtographic lens.Certainly, in order to further increase described take the photograph
The field angle of shadow camera lens, the setting parameter of above-mentioned phtographic lens can also meet relationship: 1.8 < (R5+R6)/(R5-R6) < 2.0,
In, the R5 is the radius of curvature of the 20 object side surface of the second lens, and the R6 is the 20 image side surface of the second lens
Radius of curvature can obtain it has been investigated that being reasonably configured to the thickness of second lens by using aforesaid way
There must be the second lens 20 of higher caliper value, and may make the field angle of the phtographic lens to increase, also, set by above-mentioned
The degree of the field angle for the phtographic lens that the mode of setting designs is greater than 75 °.
It is understood that this requires the rulers of the phtographic lens as electronic equipment is constantly towards miniaturization
It is very little also to reduce therewith, therefore the application is also defined the size of the phtographic lens, specifically: the photographic mirror
The setting parameter of head meets relationship: -4 < f2/f3 < -3.5, wherein the f2 is the focal length of second lens, and the f3 is institute
The focal length for stating the third lens, by according to above-mentioned relation set described second and the focal lengths of the third lens shorten the length of TTL,
Therefore the size of the phtographic lens is reduced.
Embodiment two；
It is understood that based on the basis of embodiment one, in order to further increase the phtographic lens performance, reduce
The cost of the phtographic lens, in the above-mentioned fact of the application, the condition constrained to the design parameter of the phtographic lens is also
May include any one in following relationship or any combination:
0.43<D4/E4<1.28；
Vd2>22 and Vd4<55；
1.5<n1&n3&n4<1.6；
Wherein, the D4 is the 4th lens in the thickness on optical axis, and the E4 is the 4th lens on off axis
Thickness；The Vd2 is the Abbe number of second lens, and the Vd4 is the Abbe number of the 4th lens, and the n1 is institute
The refractive index of the first lens is stated, the n3 is the refractive index of the third lens, and the n4 is the refractive index of the 4th lens.
Wherein, it is defined, is made by the 4th lens 40 described in the phtographic lens of condition 0.43 < D4/E4 < 1.28 pair
The 4th lens 40 after must limiting are convenient for molding, to facilitate production, so that the yield of product can be improved；By condition Vd2 >
22 and the Abbe number of Vd4 < 55 pair described second and the 4th lens be defined, limit second lens 20 and the described 4th thoroughly
The abbe number of mirror 40 reaches the aberration for reducing the phtographic lens imaging, improves the purpose of image quality；By condition 1.5 <
N1&n3&n4 < 1.6 pair are described first, third, the refractive index of the 4th lens are defined, and facilitate correction system aberration, meanwhile,
It limits described first, third, the 4th lens to be made of material of the refractive index between 1.5-1.6, helps to reduce described the
One, third, the production of the 4th lens, manufacturing cost.
Preferably, in the present embodiment, the setting parameter of the phtographic lens meets condition:
(1) 1.3 ﹤ TTL/F ﹤ 1.4；
(2)0.1<(EPD/F)×tgFOV√(F/100)<0.5；
(3)0.8<(IMA/2)/F<0.85；
(4)-4<f2/f3<-3.5；
(5)1.8<(R5+R6)/(R5-R6)<2.0；
(6)0.43<D2/E2<0.75；
(7)f3/f4≦-1；
(8) 0.3 ﹤ Vd3-Vd4 ﹤ 0.4；
Wherein, 8 of aforementioned four lens aspherical meet condition
The z indicates that the Z coordinate value of lens surface each point, r indicate the Y axis coordinate value of each point on lens surface, and c is the song of lens surface
The inverse of rate radius R, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
On the basis of meeting above-mentioned 8 constraint condition, the design parameter of the phtographic lens can be with are as follows: F=2.85mm,
FNO=2.0, FOV=77.6 °, in order to verify the technical effect of phtographic lens disclosed in the above embodiments of the present application, the application
Also by being adopted to by the parameter of the diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface
It is defined, the asphericity coefficient is defined using the numerical value in table 2, the obtained photography with the numerical value in table 1
The structure of camera lens can be found in Fig. 1, be tested the obtained curvature of field and distortion figure Fig. 2 and spherical aberration figure Fig. 3, and test result shows to use
The phtographic lens that Technical Design disclosed in the above embodiments of the present application obtains has good imaging effect.
Embodiment three
It is understood that based on the basis of embodiment one, in order to further increase the phtographic lens performance, reduce
The cost of the phtographic lens, in the above-mentioned fact of the application, the condition constrained to the design parameter of the phtographic lens is also
May include any one in following relationship or any combination:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3 ﹤ n3-n4 ﹤ 0.4；
Wherein, the D2 is second lens in the thickness on optical axis, and the E2 is second lens on off axis
Thickness, the f3 be the third lens focal length, the f4 be the 4th focal length of lens, the n3 be the third lens
Refractive index, the n4 be the 4th lens refractive index.
Wherein, it is defined by the second lens 20 in the phtographic lens of condition 0.43 < D2/E2 < 0.75 pair, so that
Second lens 20 after restriction are convenient for molding, to facilitate production, so that the yield of product can be improved；Pass through condition f3/f4
The focal length of≤- 1 pair of third and fourth lens is defined, so that the total length of the phtographic lens reduces, reduces institute
State the size of phtographic lens；The refractive index of the third, the 4th lens is defined by 0.3 ﹤ n3-n4 ﹤ 0.4 of condition, is made
The material that third and fourth lens select different refractivity is obtained, so that refractive index between the two has 0.3-0.4
Difference, to improve image quality, it is to be understood that each implementation of the phtographic lens disclosed in the embodiment of the present application
In example, first lens and the third lens can be made of the identical material of refractive index.Second lens can use
The refractive index of another material is constituted, the material of the refractive index and composition the third lens of the material for constituting the 4th lens
Refractive index meets 0.3 ﹤ n3-n4 ﹤ 0.4 of relationship.
Preferably, in the present embodiment, the setting parameter of the phtographic lens meets condition:
(1) 1.3 ﹤ TTL/F ﹤ 1.4；
(2)0.1<(EPD/F)×tgFOV√(F/100)<0.5；
(3)0.8<(IMA/2)/F<0.85；
(4)-4<f2/f3<-3.5；
(5)1.8<(R5+R6)/(R5-R6)<2.0；
(6)0.43<D2/E2<0.75；
(7)f3/f4≦-1；
(8) 0.3 ﹤ n3-n4 ﹤ 0.4；
Wherein, 8 of aforementioned four lens aspherical meet condition
The z indicates that the Z coordinate value of lens surface each point, r indicate the Y axis coordinate value of each point on lens surface, and c is the song of lens surface
The inverse of rate radius R, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
On the basis of meeting above-mentioned 8 constraint condition, the design parameter of the phtographic lens can be with are as follows: F=2.75mm,
FNO=2.1, FOV=79.4 °, in order to verify the technical effect of phtographic lens disclosed in the above embodiments of the present application, the application
Also by being adopted to by the parameter of the diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface
It is defined, the asphericity coefficient is defined using the numerical value in table 4, the obtained photography with the numerical value in table 3
The structure of camera lens can be found in Fig. 4, be tested the obtained curvature of field and distortion figure Fig. 5 and spherical aberration figure Fig. 6, and test result shows to use
The phtographic lens that Technical Design disclosed in the above embodiments of the present application obtains has good imaging effect.
Example IV；
It is understood that based on the basis of embodiment one, in order to further increase the phtographic lens performance, reduce
The cost of the phtographic lens, in the above-mentioned fact of the application, the condition constrained to the design parameter of the phtographic lens is also
May include any one in following relationship or any combination:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4 ﹤ f3/F ﹤ 0.5；
Wherein, the D3 is the third lens in the thickness on optical axis, and the E3 is the third lens on off axis
Thickness, Vd2 is the Abbe number of second lens, and the Vd3 is the Abbe number of the third lens, and the f3 is described the
The focal length of three lens.
Wherein, it is carried out by the thickness of the third lens 30 described in the phtographic lens of condition 1.25 < D3/E3 < 3.24 pair
It limits, so that the third lens 30 after limiting are produced, so that the yield of product can be improved convenient for molding with facilitating；Pass through
The Abbe number of condition Vd2-Vd3≤33 pair described second and the third lens is defined, and limits second lens 20 and described
The abbe number of the third lens 30 reaches the aberration for reducing the phtographic lens imaging, improves the purpose of image quality；Pass through item
0.4 ﹤ f3/F ﹤ 0.5 of part is defined the focal length of the third lens, and then limits the thickness value of the third lens 30, reaches
To the purpose for the overall length for reducing phtographic lens.
Preferably, in the present embodiment, the setting parameter of the phtographic lens meets condition:
(1) 1.3 ﹤ TTL/F ﹤ 1.4；
(2)0.1<(EPD/F)×tgFOV√(F/100)<0.5；
(3)0.8<(IMA/2)/F<0.85；
(4)-4<f2/f3<-3.5；
(5)1.8<(R5+R6)/(R5-R6)<2.0；
(6)1.25<D3/E3<3.24；
(7)Vd2-Vd3≧33；
(8) 0.4 f3/F < 0.5 ﹤；
Wherein, 8 of aforementioned four lens aspherical meet condition
The z indicates that the Z coordinate value of lens surface each point, r indicate the Y axis coordinate value of each point on lens surface, and c is the song of lens surface
The inverse of rate radius R, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
On the basis of meeting above-mentioned 8 constraint condition, the design parameter of the phtographic lens can be with are as follows: F=2.8mm,
FNO=1.9, FOV=78.5 °, in order to verify the technical effect of phtographic lens disclosed in the above embodiments of the present application, the application
Also by being adopted to by the parameter of the diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface
It is defined, the asphericity coefficient is defined using the numerical value in table 6, the obtained photography with the numerical value in table 5
The structure of camera lens can be found in Fig. 7, be tested the obtained curvature of field and distortion figure Fig. 8 and spherical aberration figure Fig. 9, and test result shows to use
The phtographic lens that Technical Design disclosed in the above embodiments of the present application obtains has good imaging effect.
Embodiment five
It is understood that based on the basis of embodiment one, in order to further increase the phtographic lens performance, reduce
The cost of the phtographic lens, in the above-mentioned fact of the application, the condition constrained to the design parameter of the phtographic lens is also
May include any one in following relationship or any combination:
TL1A1-L4A4/ BFL < 2.15；
T12=T34；
E3 ﹤ E1 ﹤ E2 ﹤ E4；
Wherein, the TL1A1-L4A4It is located at the central point of optical axis to the described 4th thoroughly for the object side surface of first lens
The image side surface of mirror is located at the distance of the central point on optical axis, and the BFL is that the image side surface of the 4th lens is located in optical axis
For heart point to the vertical range of the imaging surface, the T12 is first lens and interval of second lens on optical axis
Distance, the T34 are the third lens and spacing distance of the 4th lens on optical axis, and the E3 is that the third is saturating
Thickness of the mirror on off-axis, the thickness that the E1 is first lens on off-axis, E2 are second lens on off-axis
Thickness, the thickness that E4 is the 4th lens on off-axis.
Above-mentioned limited way passes through condition TL1A1-L4A4/ BFL < 2.15 may make phtographic lens focusing with higher
Amount；It is saturating to spacing distance on optical axis of first lens and second lens, the third by condition T12=T34
Mirror is defined with spacing distance of the 4th lens on optical axis so that first lens and second lens from
Wheelbase under the premise of satisfaction minimizes overall length, is taken the photograph from the off-axis distance of, the third lens and the 4th lens described in satisfaction
The basic group reload request of shadow camera lens.
Preferably, in the present embodiment, the setting parameter of the phtographic lens meets condition:
(1) 1.3 ﹤ TTL/F ﹤ 1.4；
(2)0.1<(EPD/F)×tgFOV√(F/100)<0.5；
(3)0.8<(IMA/2)/F<0.85；
(4)-4<f2/f3<-3.5；
(5)1.8<(R5+R6)/(R5-R6)<2.0；
(6) TL1A1-L4A4/BFL < 2.15；
(7) T12=T34；
(8) E3 ﹤ E1 ﹤ E2 ﹤ E4；
Wherein, 8 of aforementioned four lens aspherical meet condition
The z indicates that the Z coordinate value of lens surface each point, r indicate the Y axis coordinate value of each point on lens surface, and c is the song of lens surface
The inverse of rate radius R, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
On the basis of meeting above-mentioned 8 constraint condition, the design parameter of the phtographic lens can be with are as follows: F=2.84mm,
FNO=2.0, FOV=77.3 °, in order to verify the technical effect of phtographic lens disclosed in the above embodiments of the present application, the application
Also by being adopted to by the parameter of the diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface
It is defined, the asphericity coefficient is defined using the numerical value in table 8, the obtained photography with the numerical value in table 7
The structure of camera lens can be found in Figure 10, is tested the obtained curvature of field and distortion figure Figure 11 and spherical aberration figure Figure 12, test result and shows to adopt
The phtographic lens that the Technical Design disclosed in the above embodiments of the present application obtains has good imaging effect.
It is understood that the application is also to described first to fourth in order to reduce the manufacturing cost of the phtographic lens
The material of lens is defined, it is preferred that the material of first to fourth lens is resin.
It is understood that being directed to phtographic lens disclosed in the above embodiments of the present application, present invention also provides one kind
Using the image capture device of the phtographic lens, described image acquisition equipment may include the above-mentioned any one embodiment of the application
Disclosed phtographic lens.Wherein, described image acquisition equipment can be specially in the prior art any one with Image Acquisition
The electronic equipment of function, for example, its can for mobile phone, notebook and iPad, palm PC, camera etc. be able to carry out video or
The electronic equipment of Image Acquisition.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of phtographic lens, which is characterized in that successively include: by the direction of object side to image side along optical axis
Diaphragm, the first lens, the second lens, the third lens, the 4th lens, optical filter and imaging surface with same central axis；
First lens have positive light coke, and the object side surface and image side surface of first lens are convex configuration；
Second lens have negative power, and the image side surface of second lens is concave structure；
The third lens have positive light coke, and the object side surface of the third lens is concave structure, image side surface is convex surface
Structure；
4th lens have negative power, and the 4th lens are meniscus, and the object side table of the 4th lens
Face is convex surface, image side surface is concave surface, and the two sides of the 4th lens are wavy；
First lens, the second lens, the object side surface of the third lens and the 4th lens and image side surface are aspherical knot
Structure；
The setting parameter of phtographic lens meets relational expression:
Wherein, the EPD is the entrance pupil aperture of the phtographic lens, and F is the effective focal length of the phtographic lens, and the FOV is
The field angle of the phtographic lens.
2. phtographic lens according to claim 1, which is characterized in that the setting parameter of the phtographic lens also meets following
Any one in relational expression or any combination:
1.3 ﹤ TTL/F ﹤ 1.4；
0.8<(IMA/2)/F<0.85；
-4<f2/f3<-3.5；
1.8<(R5+R6)/(R5-R6)<2.0；
Wherein, the TTL is the overall length of the phtographic lens, and the IMA is the image height of the phtographic lens, and the f2 is described
The focal length of second lens, the f3 are the focal length of the third lens, and the R5 is the curvature of the second lens object side surface
Radius, the R6 are the radius of curvature on second lens image side surface.
3. phtographic lens according to claim 1 or 2, which is characterized in that the setting parameter of the phtographic lens also meets
Any one in following relationship or any combination:
0.43<D4/E4<1.28
Vd2>22 and Vd4<55
N4 < 1.6 1.5 < n1 & n3 &；
Wherein, the D4 is the 4th lens in the thickness on optical axis, the thickness that the E4 is the 4th lens on off-axis
Degree；The Vd2 is the Abbe number of second lens, and the Vd4 is the Abbe number of the 4th lens, and the n1 is described the
The refractive index of one lens, the n3 are the refractive index of the third lens, and the n4 is the refractive index of the 4th lens.
4. phtographic lens according to claim 1 or 2, which is characterized in that the setting parameter of the phtographic lens also meets
Any one in following relationship or any combination:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3 ﹤ n3-n4 ﹤ 0.4；
Wherein, the D2 is second lens in the thickness on optical axis, the thickness that the E2 is second lens on off-axis
Degree, the f3 are the third lens focal length, and the f4 is the 4th focal length of lens, and the n3 is the folding of the third lens
Rate is penetrated, the n4 is the refractive index of the 4th lens.
5. phtographic lens according to claim 1 or 2, which is characterized in that the setting parameter of the phtographic lens also meets
Any one in following relationship or any combination:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4 ﹤ f3/F ﹤ 0.5；
Wherein, the D3 is the third lens in the thickness on optical axis, the thickness that the E3 is the third lens on off-axis
Degree, Vd2 are the Abbe number of second lens, and the Vd3 is the Abbe number of the third lens, and the f3 is that the third is saturating
The focal length of mirror.
6. phtographic lens according to claim 1 or 2, which is characterized in that the setting parameter of the phtographic lens also meets
Any one in following relationship or any combination:
TL1A1-L4A4/ BFL < 2.15；
T12=T34；
E3 ﹤ E1 ﹤ E2 ﹤ E4；
Wherein, the TL1A1-L4A4It is located at the central point of optical axis to the 4th lens for the object side surface of first lens
Image side surface is located at the distance of the central point on optical axis, and the BFL is that the image side surface of the 4th lens is located at the central point of optical axis
To the vertical range of the imaging surface, the T12 is first lens and spacing distance of second lens on optical axis,
The T34 is the third lens and spacing distance of the 4th lens on optical axis, the E3 be the third lens in
Thickness on off-axis, the thickness that the E1 is first lens on off-axis, the thickness that E2 is second lens on off-axis
Degree, the thickness that E4 is the 4th lens on off-axis.
7. phtographic lens according to claim 1, which is characterized in that first lens, the second lens, the third lens and
The material of 4th lens is resin.
8. a kind of image capture device, which is characterized in that application has the right to require phtographic lens described in 1-7 any one.
9. image capture device according to claim 8, which is characterized in that described image acquire equipment be mobile phone, PDA,
Camera or computer.
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| CN201510823860.XA CN105259642B (en) | 2015-11-23 | 2015-11-23 | A kind of phtographic lens and image capture device |
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| CN105259642B true CN105259642B (en) | 2019-02-19 |
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| CN104020550B (en) * | 2014-03-04 | 2016-10-05 | 广东旭业光电科技股份有限公司 | A kind of phtographic lens |
| CN104570295A (en) * | 2014-12-31 | 2015-04-29 | 广东旭业光电科技股份有限公司 | Large-aperture low-sensitiveness optical lens assembly |
| CN205427288U (en) * | 2015-11-23 | 2016-08-03 | 广东旭业光电科技股份有限公司 | Photographic lens and image acquisition equipment |
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