CN105259642A - Camera lens and image acquisition device - Google Patents
Camera lens and image acquisition device Download PDFInfo
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- CN105259642A CN105259642A CN201510823860.XA CN201510823860A CN105259642A CN 105259642 A CN105259642 A CN 105259642A CN 201510823860 A CN201510823860 A CN 201510823860A CN 105259642 A CN105259642 A CN 105259642A
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- lens
- phtographic
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- phtographic lens
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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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- Optics & Photonics (AREA)
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Abstract
The invention provides a camera lens and an image acquisition device. The camera lens sequentially comprises, from the object side to the image side along the optical axis, a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a filter sheet and an imaging surface with the same central axis. Through reasonably setting setting parameters of the camera lens, a relation as described in the description is met, the camera lens has a large aperture, an increased incoming light amount in the case of image acquisition in a dark light environment can be realized, and the imaging quality is improved.
Description
Technical field
The present invention relates to imaging device technical field, more particularly, relate to a kind of phtographic lens and image capture device.
Background technology
In recent years, along with the integrated level of the continuous progress of science and technology, digital electric equipment is also more and more higher, the photographic equipment such as mobile phone, digital camera becomes smaller and more exquisite, frivolous, portable, phtographic lens has become requisite optical module in the intelligent terminal such as mobile phone, PDA, when adopting phtographic lens of the prior art to carry out image acquisition when dark, image quality is lower, therefore, a kind of phtographic lens also when insufficient light with high-quality imaging how is provided to become one of those skilled in the art's technical matters urgently to be resolved hurrily.
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 a kind of phtographic lens also when insufficient light with the imaging of better quality.
For achieving the above object, the embodiment of the present invention provides following technical scheme:
A kind of phtographic lens, is comprised along optical axis successively by the direction of thing side to image side:
There is the diaphragm of same central shaft, the first lens, the second lens, the 3rd lens, the 4th lens, optical filter and imaging surface;
Described first lens have positive light coke, and thing side surface and the surface, image side of described first lens are convex configuration;
Described second lens have negative power, and the surface, image side of described second lens is concave structure;
Described 3rd lens have positive light coke, and the thing side surface of described 3rd lens is concave structure, surface, image side is convex configuration;
Described 4th lens have negative power, and described 4th lens are meniscus, and the thing side surface of described 4th lens be convex surface, surface, image side for concave surface, and the two sides undulate of the 4th lens;
Thing side surface and the surface, image side of described first lens, the second lens, the 3rd lens and the 4th lens are non-spherical structure;
The parameters of phtographic lens meets relational expression:
Wherein, described EPD is the entrance pupil aperture of described phtographic lens, and F is the effective focal length of described phtographic lens, and described FOV is the field angle of described phtographic lens.
Preferably, in phtographic lens described above, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
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, described TTL is the overall length of described phtographic lens, described IMA is the image height of described phtographic lens, described f2 is the focal length of described second lens, described f3 is the focal length of described 3rd lens, described R5 is the radius-of-curvature of described second lens thing side surface, and described R6 is the radius-of-curvature on described second surface, lens image side.
Preferably, in phtographic lens described above, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
0.43<D4/E4<1.28；
Vd2>22 and Vd4<55;
1.5<n1&n3&n4<1.6；
Wherein, described D4 is the thickness of described 4th lens on optical axis, and described E4 is described 4th lens in from the thickness on axle; Described Vd2 is the Abbe number of described second lens, and described Vd4 is the Abbe number of described 4th lens, and described n1 is the refractive index of described first lens, and described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
Preferably, in phtographic lens described above, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3﹤n3-n4﹤0.4；
Wherein, described D2 is the thickness of described second lens on optical axis, described E2 is described second lens in from the thickness on axle, described f3 is described 3rd focal length of lens, described f4 is described 4th focal length of lens, described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
Preferably, in phtographic lens described above, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4﹤f3/F﹤0.5；
Wherein, described D3 is the thickness of described 3rd lens on optical axis, and described E3 is described 3rd lens in from the thickness on axle, and Vd2 is the Abbe number of described second lens, and described Vd3 is the Abbe number of described 3rd lens, and described f3 is the focal length of described 3rd lens.
Preferably, in phtographic lens described above, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
T
L1A1-L4A4/BFL＜2.15；
T12＝T34；
E3﹤E1﹤E2﹤E4；
Wherein, described T
l1A1-L4A4the central point that thing side surface for described first lens is positioned at optical axis is positioned at the distance of the central point on optical axis to the face, image side of described 4th lens, described BFL is the vertical range of central point to described imaging surface that the face, image side of described 4th lens is positioned at optical axis, described T12 is described first lens and the spacing distance of described second lens on optical axis, described T34 is described 3rd lens and the spacing distance of described 4th lens on optical axis, described E3 is described 3rd lens in from the thickness on axle, described E1 is described first lens in from the thickness on axle, E2 is described second lens in from the thickness on axle, E4 is described 4th lens in from the thickness on axle.
Preferably, in phtographic lens described above, the material of described first lens, the second lens, the 3rd lens and the 4th lens is resin.
A kind of image capture device, application has the phtographic lens described in above-mentioned any one.
Preferably, described image capture device is mobile phone, PDA, camera or computer.
Based on technique scheme, the phtographic lens that the embodiment of the present invention provides, by rationally arranging the parameters of described pick-up lens, makes it meet relation
make described phtographic lens have larger aperture, thus when making to gather image under the environment of dark, light-inletting quantity increases, thus improve image quality.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of Fig. 1 a kind of phtographic lens disclosed in the embodiment of the present application;
Fig. 2 for disclosed in the embodiment of the present application two phtographic lens test the curvature of field and distortion figure that obtain;
Fig. 3 for disclosed in the embodiment of the present application two phtographic lens test the spherical aberration figure obtained;
The structural representation of Fig. 4 a kind of phtographic lens disclosed in application embodiment three;
Fig. 5 for disclosed in the embodiment of the present application three phtographic lens test the curvature of field and distortion figure that obtain;
Fig. 6 for disclosed in the embodiment of the present application three phtographic lens test the spherical aberration figure obtained;
The structural representation of Fig. 7 a kind of phtographic lens disclosed in application embodiment four;
Fig. 8 for disclosed in the embodiment of the present application four phtographic lens test the curvature of field and distortion figure that obtain;
Fig. 9 for disclosed in the embodiment of the present application four phtographic lens test the spherical aberration figure obtained;
The structural representation of Figure 10 a kind of phtographic lens disclosed in application embodiment five;
Figure 11 for disclosed in the embodiment of the present application five phtographic lens test the curvature of field and distortion figure that obtain;
Figure 12 for disclosed in the embodiment of the present application five phtographic lens test the spherical aberration figure obtained.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
The application is found by research, when taking pictures when insufficient light, the effect of the image shot is relevant with the F number of described phtographic lens, described F number is less, aperture is larger, the light being entered into sensor by camera lens is more, and light-inletting quantity is more, and imaging is also just brighter, therefore, the light levels of shooting picture effectively can be improved by reducing described F number.
Be directed to this, see Fig. 1, the application is provided with a kind of phtographic lens, and this camera lens is comprised along optical axis successively by the direction of thing side to image side:
There is diaphragm 00, first lens 10, second lens 20 of same central shaft, the 3rd lens 30, the 4th lens 40, optical filter 50 and imaging surface 60;
Described first lens 10 are for having the lens of positive light coke, and thing side surface and the surface, image side of described first lens 10 are convex configuration;
Described second lens 20 are for having the lens of negative power, and the surface, image side of described second lens 20 is concave structure;
Described 3rd lens 30 are for having the lens of positive light coke, and the thing side surface of described 3rd lens 30 is concave structure, surface, image side is convex configuration;
Described 4th lens 40 are for having the lens of negative power, the surface of described 4th lens 40 is non-spherical structure, described 4th lens 40 are meniscus, and the thing side surface of described 4th lens 40 be convex surface, surface, image side for concave surface, and the two sides undulate of the 4th lens 40;
The parameters of phtographic lens meets relational expression:
Wherein, described EPD is the entrance pupil aperture of described phtographic lens, and F is the effective focal length of described phtographic lens, and described FOV is the field angle of described phtographic lens.
See scheme disclosed in the above embodiments of the present application, by rationally arranging the parameters of described pick-up lens, it is made to meet relation 0.1< (EPD/F) × tgFOV √ (F/100) <0.5, this phtographic lens is made to meet on the basis of normal distribution mode in imaging, its F coefficient reduces as much as possible, thus when making to gather image under the environment of dark, light-inletting quantity increases, thus improves image quality.
Wherein, obtain through overtesting, the F number of the phtographic lens adopting Technical Design disclosed in the above embodiments of the present application to obtain can reach 2.0 and following, its F number much smaller than conventional radiography camera lens in prior art (2.4,2.6 and 2.8), therefore its imaging effect is also just much better than phtographic lens conventional in prior art.
Be understandable that, when carrying out image acquisition, user can focus according to the position at thing place, and the size of described focusing amount directly affects the Experience Degree of user, and therefore conveniently user uses, the application is also by reasonably arranging the parameters of described phtographic lens, make it have larger focusing amount, concrete, the parameters of described phtographic lens meets relation: 1.3 ﹤ TTL/F ﹤ 1.4, wherein, described TTL is the overall length of described phtographic lens.
Be understandable that, the size of the field angle of described phtographic lens determines the field range of described phtographic lens, field angle is larger, the visual field is larger, the visual field of imaging is also just all the more open, therefore the application is also by rationally arranging the parameters of described phtographic lens, its field angle is increased as much as possible, concrete, the parameters of described phtographic lens meets relation: 0.8< (IMA/2)/F<0.85, wherein, described IMA is the image height of described phtographic lens.Certainly, in order to increase the field angle of described phtographic lens further, the parameters of above-mentioned phtographic lens also can meet relation: 1.8< (R5+R6)/(R5-R6) <2.0, wherein, described R5 is the radius-of-curvature of described second lens 20 thing side surface, described R6 is the radius-of-curvature on described second surface, lens 20 image side, find by adopting aforesaid way reasonably to arrange the thickness of described second lens after deliberation, second lens 20 with higher caliper value can be obtained, and the field angle of described phtographic lens can be made to increase, and, the number of degrees of the field angle of the described phtographic lens obtained by the design of above-mentioned set-up mode are greater than 75 °.
Be understandable that, along with electronic equipment is constantly towards miniaturization, this just requires that the size of described phtographic lens also must reduce thereupon, therefore the application also limits the size of described phtographic lens, be specially: the parameters of described phtographic lens meets relation :-4<f2/f3<-3.5, wherein, described f2 is the focal length of described second lens, described f3 is the focal length of described 3rd lens, by shortening the length of TTL according to the focal length of above-mentioned relation setting described second and the 3rd lens, because this reducing the size of described phtographic lens.
Embodiment two;
Be understandable that, on basis based on embodiment one, in order to improve described phtographic lens performance further, reduce the cost of described phtographic lens, in the above-mentioned fact of the application, the condition retrained the design parameter of described phtographic lens can also comprise any one or combination in any in following relational expression:
0.43<D4/E4<1.28；
Vd2>22 and Vd4<55;
1.5<n1&n3&n4<1.6；
Wherein, described D4 is the thickness of described 4th lens on optical axis, and described E4 is described 4th lens in from the thickness on axle; Described Vd2 is the Abbe number of described second lens, and described Vd4 is the Abbe number of described 4th lens, and described n1 is the refractive index of described first lens, and described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
Wherein, by condition 0.43<D4/E4<1.28, the 4th lens 40 described in described phtographic lens are limited, make described 4th lens 40 after limiting be convenient to shaping, to facilitate production, thus the yield of product can be improved; By condition Vd2>22 and Vd4<55 to described second and the 4th the Abbe number of lens limit, limit the abbe number of described second lens 20 and described 4th lens 40, reach the aberration reducing described phtographic lens imaging, improve the object of image quality; By condition 1.5<n1 & n3 & n4<1.6, the refractive index of described first, the 3rd, the 4th lens is limited, contribute to correction system aberration, simultaneously, limiting described first, the 3rd, the 4th lens adopts the material of refractive index between 1.5-1.6 to make, and contributes to the production, the manufacturing cost that reduce described first, the 3rd, the 4th lens.
Preferably, in the present embodiment, the parameters of described phtographic lens satisfies 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 aspheric surfaces of above-mentioned four lens satisfy condition
On the basis meeting above-mentioned 8 constraint conditions, the design parameter of described phtographic lens can be: F=2.85mm, FNO=2.0, FOV=77.6 °, in order to verify the technique effect of phtographic lens disclosed in the above embodiments of the present application, the application is also by by described diaphragm, first lens, second lens, 3rd lens, 4th lens, numerical value in the parameter employing table 1 of optical filter and imaging surface limits, numerical value in described asphericity coefficient employing table 2 is limited, the structure of the described phtographic lens obtained can see Fig. 1, through testing the curvature of field and distortion figure Fig. 2 and spherical aberration figure Fig. 3 that obtain, test findings shows, the phtographic lens that disclosed in the above embodiments of the present application, Technical Design obtains is adopted to have good imaging effect.
Embodiment three
Be understandable that, on basis based on embodiment one, in order to improve described phtographic lens performance further, reduce the cost of described phtographic lens, in the above-mentioned fact of the application, the condition retrained the design parameter of described phtographic lens can also comprise any one or combination in any in following relational expression:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3﹤n3-n4﹤0.4；
Wherein, described D2 is the thickness of described second lens on optical axis, described E2 is described second lens in from the thickness on axle, described f3 is described 3rd focal length of lens, described f4 is described 4th focal length of lens, described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
Wherein, by condition 0.43<D2/E2<0.75, the second lens 20 in described phtographic lens are limited, make described second lens 20 after limiting be convenient to shaping, to facilitate production, thus the yield of product can be improved; Limited by the focal length of condition f3/f4≤-1 to described third and fourth lens, the total length of described phtographic lens is reduced, reduces the size of described phtographic lens; By condition 0.3 ﹤ n3-n4 ﹤ 0.4, the refractive index of described 3rd, the 4th lens is limited, described third and fourth lens are made to select the material of different refractivity, thus make refractive index between the two have the difference of 0.3-0.4, to improve image quality, be understandable that, in each embodiment of phtographic lens described disclosed in the embodiment of the present application, described first lens and the 3rd lens can adopt the identical material of refractive index to make.Described second lens can adopt the refractive index of another material to form, and the refractive index of the material of described formation the 4th lens meets relation 0.3 ﹤ n3-n4 ﹤ 0.4 with the refractive index of the material forming the 3rd lens.
Preferably, in the present embodiment, the parameters of described phtographic lens satisfies 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 aspheric surfaces of above-mentioned four lens satisfy condition
On the basis meeting above-mentioned 8 constraint conditions, the design parameter of described phtographic lens can be: F=2.75mm, FNO=2.1, FOV=79.4 °, in order to verify the technique effect of phtographic lens disclosed in the above embodiments of the present application, the application is also by by described diaphragm, first lens, second lens, 3rd lens, 4th lens, numerical value in the parameter employing table 3 of optical filter and imaging surface limits, numerical value in described asphericity coefficient employing table 4 is limited, the structure of the described phtographic lens obtained can see Fig. 4, through testing the curvature of field and distortion figure Fig. 5 and spherical aberration figure Fig. 6 that obtain, test findings shows, the phtographic lens that disclosed in the above embodiments of the present application, Technical Design obtains is adopted to have good imaging effect.
Embodiment four;
Be understandable that, on basis based on embodiment one, in order to improve described phtographic lens performance further, reduce the cost of described phtographic lens, in the above-mentioned fact of the application, the condition retrained the design parameter of described phtographic lens can also comprise any one or combination in any in following relational expression:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4﹤f3/F﹤0.5；
Wherein, described D3 is the thickness of described 3rd lens on optical axis, and described E3 is described 3rd lens in from the thickness on axle, and Vd2 is the Abbe number of described second lens, and described Vd3 is the Abbe number of described 3rd lens, and described f3 is the focal length of described 3rd lens.
Wherein, by condition 1.25<D3/E3<3.24, the thickness of the 3rd lens 30 described in described phtographic lens is limited, make described 3rd lens 30 after limiting be convenient to shaping, to facilitate production, thus the yield of product can be improved; By condition Vd2-Vd3≤33 to described second and the 3rd the Abbe number of lens limit, limit the abbe number of described second lens 20 and described 3rd lens 30, reach the aberration reducing described phtographic lens imaging, improve the object of image quality; By condition 0.4 ﹤ f3/F ﹤ 0.5, the focal length of described 3rd lens is limited, and then limit the one-tenth-value thickness 1/10 of described 3rd lens 30, reach the object of the overall length reducing phtographic lens.
Preferably, in the present embodiment, the parameters of described phtographic lens satisfies 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 aspheric surfaces of above-mentioned four lens satisfy condition
On the basis meeting above-mentioned 8 constraint conditions, the design parameter of described phtographic lens can be: F=2.8mm, FNO=1.9, FOV=78.5 °, in order to verify the technique effect of phtographic lens disclosed in the above embodiments of the present application, the application is also by by described diaphragm, first lens, second lens, 3rd lens, 4th lens, numerical value in the parameter employing table 5 of optical filter and imaging surface limits, numerical value in described asphericity coefficient employing table 6 is limited, the structure of the described phtographic lens obtained can see Fig. 7, through testing the curvature of field and distortion figure Fig. 8 and spherical aberration figure Fig. 9 that obtain, test findings shows, the phtographic lens that disclosed in the above embodiments of the present application, Technical Design obtains is adopted to have good imaging effect.
Embodiment five
Be understandable that, on basis based on embodiment one, in order to improve described phtographic lens performance further, reduce the cost of described phtographic lens, in the above-mentioned fact of the application, the condition retrained the design parameter of described phtographic lens can also comprise any one or combination in any in following relational expression:
T
L1A1-L4A4/BFL＜2.15；
T12＝T34；
E3﹤E1﹤E2﹤E4；
Wherein, described T
l1A1-L4A4the central point that thing side surface for described first lens is positioned at optical axis is positioned at the distance of the central point on optical axis to the face, image side of described 4th lens, described BFL is the vertical range of central point to described imaging surface that the face, image side of described 4th lens is positioned at optical axis, described T12 is described first lens and the spacing distance of described second lens on optical axis, described T34 is described 3rd lens and the spacing distance of described 4th lens on optical axis, described E3 is described 3rd lens in from the thickness on axle, described E1 is described first lens in from the thickness on axle, E2 is described second lens in from the thickness on axle, E4 is described 4th lens in from the thickness on axle.
Above-mentioned limiting mode is by condition T
l1A1-L4A4/ BFL < 2.15 can make described phtographic lens have higher focusing amount; By condition T12=T34, to described first lens and described second lens, the spacing distance on optical axis, described 3rd lens and the spacing distance of described 4th lens on optical axis limit, make the off-axis distance of the off-axis distance of described first lens and described second lens, the 3rd lens and the 4th lens meet reduce the prerequisite of overall length to greatest extent under, meet the assembling requirement that described phtographic lens is basic.
Preferably, in the present embodiment, the parameters of described phtographic lens satisfies 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 aspheric surfaces of above-mentioned four lens satisfy condition
described z represents the Z coordinate figure of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is the inverse of the radius of curvature R of lens surface, and k is circular cone coefficient, α
1, α
2, α
3, α
4, α
5, α
6, α
7, α
8for asphericity coefficient.
On the basis meeting above-mentioned 8 constraint conditions, the design parameter of described phtographic lens can be: F=2.84mm, FNO=2.0, FOV=77.3 °, in order to verify the technique effect of phtographic lens disclosed in the above embodiments of the present application, the application is also by by described diaphragm, first lens, second lens, 3rd lens, 4th lens, numerical value in the parameter employing table 7 of optical filter and imaging surface limits, numerical value in described asphericity coefficient employing table 8 is limited, the structure of the described phtographic lens obtained can see Figure 10, through testing the curvature of field and distortion figure Figure 11 and spherical aberration figure Figure 12 that obtain, test findings shows, the phtographic lens that disclosed in the above embodiments of the present application, Technical Design obtains is adopted to have good imaging effect.
Be understandable that, in order to reduce the manufacturing cost of described phtographic lens, the application also limits the material of described first to fourth lens, and preferably, the material of described first to fourth lens is resin.
Be understandable that, be directed to phtographic lens disclosed in the above embodiments of the present application, present invention also provides a kind of image capture device applying described phtographic lens, described image capture device can comprise phtographic lens disclosed in the above-mentioned any embodiment of the application.Wherein, described image capture device can be specially in prior art that any one has the electronic equipment of image collecting function, such as, it can be mobile phone, notebook and iPad, palm PC, the first-class electronic equipment that can carry out video or image acquisition of shooting.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a phtographic lens, is characterized in that, is comprised successively along optical axis by the direction of thing side to image side:
There is the diaphragm of same central shaft, the first lens, the second lens, the 3rd lens, the 4th lens, optical filter and imaging surface;
Described first lens have positive light coke, and thing side surface and the surface, image side of described first lens are convex configuration;
Described second lens have negative power, and the surface, image side of described second lens is concave structure;
Described 3rd lens have positive light coke, and the thing side surface of described 3rd lens is concave structure, surface, image side is convex configuration;
Described 4th lens have negative power, and described 4th lens are meniscus, and the thing side surface of described 4th lens be convex surface, surface, image side for concave surface, and the two sides undulate of the 4th lens;
Thing side surface and the surface, image side of described first lens, the second lens, the 3rd lens and the 4th lens are non-spherical structure;
The parameters of phtographic lens meets relational expression:
Wherein, described EPD is the entrance pupil aperture of described phtographic lens, and F is the effective focal length of described phtographic lens, and described FOV is the field angle of described phtographic lens.
2. phtographic lens according to claim 1, is characterized in that, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
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, described TTL is the overall length of described phtographic lens, described IMA is the image height of described phtographic lens, described f2 is the focal length of described second lens, described f3 is the focal length of described 3rd lens, described R5 is the radius-of-curvature of described second lens thing side surface, and described R6 is the radius-of-curvature on described second surface, lens image side.
3. phtographic lens according to claim 1 and 2, is characterized in that, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
0.43<D4/E4<1.28
Vd2>22 and Vd4<55
1.5<n1﹠n3﹠n4<1.6；
Wherein, described D4 is the thickness of described 4th lens on optical axis, and described E4 is described 4th lens in from the thickness on axle; Described Vd2 is the Abbe number of described second lens, and described Vd4 is the Abbe number of described 4th lens, and described n1 is the refractive index of described first lens, and described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
4. phtographic lens according to claim 1 and 2, is characterized in that, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
0.43<D2/E2<0.75；
f3/f4≦-1；
0.3﹤n3-n4﹤0.4；
Wherein, described D2 is the thickness of described second lens on optical axis, described E2 is described second lens in from the thickness on axle, described f3 is described 3rd focal length of lens, described f4 is described 4th focal length of lens, described n3 is the refractive index of described 3rd lens, and described n4 is the refractive index of described 4th lens.
5. phtographic lens according to claim 1 and 2, is characterized in that, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
1.25<D3/E3<3.24；
Vd2-Vd3≧33；
0.4﹤f3/F﹤0.5；
Wherein, described D3 is the thickness of described 3rd lens on optical axis, and described E3 is described 3rd lens in from the thickness on axle, and Vd2 is the Abbe number of described second lens, and described Vd3 is the Abbe number of described 3rd lens, and described f3 is the focal length of described 3rd lens.
6. phtographic lens according to claim 1 and 2, is characterized in that, the parameters of described phtographic lens also meets any one or combination in any in following relational expression:
T
L1A1-L4A4/BFL＜2.15；
T12＝T34；
E3﹤E1﹤E2﹤E4；
Wherein, described T
l1A1-L4A4the central point that thing side surface for described first lens is positioned at optical axis is positioned at the distance of the central point on optical axis to the face, image side of described 4th lens, described BFL is the vertical range of central point to described imaging surface that the face, image side of described 4th lens is positioned at optical axis, described T12 is described first lens and the spacing distance of described second lens on optical axis, described T34 is described 3rd lens and the spacing distance of described 4th lens on optical axis, described E3 is described 3rd lens in from the thickness on axle, described E1 is described first lens in from the thickness on axle, E2 is described second lens in from the thickness on axle, E4 is described 4th lens in from the thickness on axle.
7. phtographic lens according to claim 1, is characterized in that, the material of described first lens, the second lens, the 3rd lens and the 4th lens is resin.
8. an image capture device, is characterized in that, applies the phtographic lens of having the right described in requirement 1-8 any one.
9. image capture device according to claim 8, is characterized in that, described image capture device is mobile phone, PDA, camera or computer.
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