CN102540417B - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN102540417B CN102540417B CN201010612803.4A CN201010612803A CN102540417B CN 102540417 B CN102540417 B CN 102540417B CN 201010612803 A CN201010612803 A CN 201010612803A CN 102540417 B CN102540417 B CN 102540417B
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Abstract
The invention provides a kind of imaging lens, the 3rd lens that this imaging lens comprises first lens with positive light coke successively from thing side to image side, second lens with positive light coke and one have negative power, these first lens comprise a face first surface and a second surface, these second lens comprise one the 3rd surface and one the 4th surface, 3rd lens comprise one the 5th surface and one the 6th surface, wherein, this imaging lens meets relational expression: FB/TTL > 0.30; G1R2/F1 > 19.54; D1/D2 < 1.62; Wherein, FB be the 6th surface with imaging surface along the bee-line on optical axis direction, TTL is the total length of imaging lens, and G1R2 is the radius-of-curvature of second surface, and F1 is the focal length of the first lens.
Description
Technical field
The present invention relates to imaging technique, particularly relate to a kind of imaging lens.
Background technology
Along with the lifting of complementary metal oxide semiconductor (CMOS) (CMOS) procedure for producing, in CMOS, the size (PixelSize) of single pixel can make more and more less, such as, for the CMOS of two mega pixels (2MPixels), its pixel is first reduced to 1.75 μm by original 2.25 μm, be further reduced to 1.4 μm that generally use at present again, correspondingly, the size of CMOS, also by 1/4 original " (2.25 μm) are reduced to 1/5 " (1.75 μm), then 1/6 " (1.4 μm) generally used at present are further reduced to.Due to the lifting of processing procedure, the single wafer (Wafer) of cutting same size size can obtain the crystal grain (Die) of more more number, and therefore manufacturer effectively can reduce the price of CMOS, increases product competitiveness.
Under the diminishing situation of CMOS size, have higher requirement to the design of camera lens is also corresponding, to make camera lens can match with the CMOS with reduced size, thus obtain preferably image quality.In order to obtain preferably image quality, described camera lens demand fulfillment: (1) high resolving power; (2) low aberration; (3) convex (flangeback of the long back of the body, FB), wherein, the convex system of the long back of the body makes last eyeglass of designed camera lens can away from CMOS, to avoid this eyeglass scratch (scratches) and to be stained with dust (particles), thus the image quality of camera lens is caused to reduce.
In view of this, be necessary that providing a kind of has the convex imaging lens of high resolving power, low aberration and the long back of the body.
Summary of the invention
To illustrate that one has high resolving power, low aberration and the convex imaging lens of the long back of the body with specific embodiment below.
A kind of imaging lens, it comprises the first lens that has positive light coke successively from thing side to image side, second lens with positive light coke, and the 3rd lens with negative power, these first lens comprise a first surface towards object side and a second surface towards imaging surface side, these second lens comprise the 3rd surface towards object side and the 4th surface towards imaging surface side, 3rd lens comprise the 5th surface towards object side and the 6th surface towards imaging surface side, wherein, this imaging lens meets relational expression:
FB/TTL＞0.30；
G1R2/F1＞19.54
D1/D2＜1.62；
Wherein, upper 6th surface of FB and imaging surface are along the bee-line on optical axis direction, TTL is the total length of imaging lens, G1R2 is the radius-of-curvature of second surface, F1 is the focal length of the first lens, D1 is along the distance on the direction of Vertical camera lens optical axis between the 4th surperficial effective diameter end points and the 4th centre of surface, and D2 is being parallel to the distance on imaging lens optical axis direction between the 4th surperficial effective diameter end points and the 4th centre of surface.
Relative to prior art, in imaging lens provided by the present invention, it is convex that the restriction of relational expression FB/TTL > 0.30 makes the 3rd lens have the long back of the body, the restriction of relational expression G1R2/F1 > 19.54 can make the first lens have less focal power, and correspondingly can reduce the eccentric susceptibility of the first lens, the restriction of relational expression D1/D2 < 1.62 can make imaging lens have preferably optical aberration correcting effect, imaging lens is made to maintain low aberration and higher resolution, thus ensure that imaging lens has preferably image quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of imaging lens provided by the invention.
Fig. 2 is the spherical aberration performance diagram of the imaging lens that first embodiment of the invention provides.
Fig. 3 is the curvature of field performance diagram of the imaging lens that first embodiment of the invention provides.
Fig. 4 is the distortion performance curve map of the imaging lens that first embodiment of the invention provides.
Fig. 5 is the color aberration characteristics curve map of the imaging lens that first embodiment of the invention provides.
Fig. 6 is modulation transfer function (modulationtransferfunction, the MTF) performance diagram of the imaging lens that first embodiment of the invention provides.
Fig. 7 is the spherical aberration performance diagram of the imaging lens that second embodiment of the invention provides.
Fig. 8 is the curvature of field performance diagram of the imaging lens that second embodiment of the invention provides.
Fig. 9 is the distortion performance curve map of the imaging lens that second embodiment of the invention provides.
Figure 10 is the color aberration characteristics curve map of the imaging lens that second embodiment of the invention provides.
Figure 11 is modulation transfer function (modulationtransferfunction, the MTF) performance diagram of the imaging lens that second embodiment of the invention provides.
Main element symbol description
Imaging lens 100
First lens G1
Second lens G2
3rd lens G3
First surface 11
Second surface 12
3rd surface 13
4th surface 14
5th surface 15
6th surface 16
Diaphragm 20
Optical filter 98
Imaging surface 99
Embodiment
Below in conjunction with accompanying drawing, to be described in further detail the present invention.
Refer to Fig. 1, the embodiment of the present invention provides a kind of imaging lens 100, and this imaging lens 100 comprises from thing side successively to image side: first lens G1 with positive light coke, a second lens G2 and with positive light coke have the 3rd lens G3 of negative power.Particularly, these first lens G1 comprises a first surface 11 towards object side and a second surface 12 towards imaging surface side.These second lens G2 comprises the 3rd surface 13 towards object side and the 4th surface 14 towards imaging surface side.3rd lens G3 comprises the 5th surface 15 towards object side and the 6th surface 16 towards imaging surface side.
In the present embodiment, this imaging lens 100 also comprises one and is arranged at the diaphragm (Aperturestop) 20 of these second lens G2 away from this first lens G1 side, and it is for controlling the luminous flux by the first lens G1.
The position of these first, second, third lens G1, G2, G3 immobilizes, and during imaging, light is incident to diaphragm 20 from thing side, and after the first lens G1, the second lens G2 and the 3rd lens G3, converges (imaging) successively in imaging surface 99.Understandable system, by arranging image sensor, the sensing face (not shown) as Charged Coupled Device (CCD) or complementary metal oxide semiconductor (CMOS) (CMOS) sentences composition imaging system in imaging surface 99.
Described imaging lens 100 meets following relational expression:
(1)FB/TTL＞0.30；
(2)G1R2/F1＞19.54；
(3)D1/D2＜1.62；
Wherein, FB (flangeback, carry on the back convex) be the 6th surface 16 with imaging surface 99 along the bee-line (referring to Fig. 1) on direction, optical axis M place, the total length that TTL (Totaltracklength) is imaging lens 100, G1R2 is the radius-of-curvature of second surface 12, and F1 is the focal length of the first lens G1.In addition, as shown in Figure 1, D1 is along the distance (referring to Fig. 1) on the direction of Vertical camera lens optical axis M between the 4th surperficial 14 effective diameter end points and the 4th surperficial 14 centers, D2 is being parallel to the distance on imaging lens 100 optical axis M direction between the 4th surperficial 14 effective diameter end points and the 4th surperficial 14 centers, needs indicate, indication " effective diameter end points " is herein the end points of the 4th relative optical axis M distance farthest, surface 14.
In imaging lens 100 relational expression provided by the present invention, it is convex that the restriction of relational expression (1) makes the 3rd lens G3 have the long back of the body, the restriction of relational expression (2) can make the first lens G1 have less focal power (power), and correspondingly can reduce the eccentric susceptibility of the first lens G1, the restriction of relational expression (3) can make imaging lens 100 have preferably optical aberration correcting effect, make imaging lens 100 maintain low aberration and higher resolution, thus ensure that imaging lens 100 has preferably image quality.
The material of described first, second, third lens G1, G2, G3 can be selected from any one person in plastics, polymkeric substance and glass respectively.Preferably, for cost-saving, first, second, third lens G1, G2, G3 of the present invention all adopts made of plastic.
Can arrange an optical filter 98 between the 3rd lens G3 and this imaging surface 99, this optical filter 98 is for optionally filtering part light, thus optimal imaging effect.Such as, described optical filter 98 can be a cutoff filter (IR-CutFilter), with the infrared light filtering that cannot be detected by human eye.
Described imaging lens 100 can be used in portable electron device, such as, in mobile phone.
In order to the image quality ensureing that imaging lens 100 has under above-mentioned restrictive condition further, described imaging lens 100 can meet following relational expression further:
(4)-0.34＞G1R2/F2＞G2R1/F2＞-0.68；
(5)-0.42＞G3R2/F3＞G3R1/F3＞-1.92；
Wherein, G2R1 is the radius-of-curvature on the 3rd surface 13, and G2R2 is the radius-of-curvature on the 4th surface 14, and G3R1 is the radius-of-curvature on the 5th surface 15, and G3R2 is the radius-of-curvature on the 6th surface 16, and F2 is the focal length of the second lens G2, and F3 is the focal length of the 3rd lens G3.The restriction of relational expression (4) can guarantee that the focal power of imaging lens 100 is distributed rationally, makes imaging lens 100 have good optical aberration correcting effect.The restriction of relational expression (5) can guarantee that the periphery amount of recess (sag) of the 3rd lens G3 is less, and the center on the 6th surface 16 of the 3rd lens G3 is longer to the distance (carrying on the back convex) of imaging surface 99.In addition, following relational expression is being met:
(6)Vd2＞53、Vd3＜33；
Condition under, imaging lens 100 of the present invention also can effective color difference eliminating, and wherein, Vd2 is the Abbe number of the second lens G2, and Vd3 is the Abbe number of the 3rd lens G3.
With lens surface center for initial point, optical axis is x-axis, and the aspheric surface face type expression formula of lens surface is:
Wherein, c is the curvature at specular surface center,
for the height from optical axis to lens surface, k system quadric surface coefficient, A
iit is the aspheric surface face type coefficient on the i-th rank.
By the data of table 1, table 2, table 3 (referring to hereafter) is substituted into above-mentioned expression formula, the aspherical shape of each lens surface in the imaging lens 100 of first embodiment of the invention can be obtained, in addition, by the data of table 4, table 5, table 6 (referring to hereafter) is substituted into above-mentioned expression formula, the aspherical shape of each lens surface in the imaging lens 100 of second embodiment of the invention can be known.
Show by the optical surface of thing end to picture end sequential in following each table respectively, wherein, agreement F/No is the f-number of imaging lens 100,2 ω are the field angle of imaging lens 100, R is the radius-of-curvature of the optical surface of each lens, D is that the optical surface of correspondence is to distance (two optical surfaces intercept the length of optical axis) on the axle of a rear optical surface, Nd is the refractive index of corresponding lens combination to d light (wavelength is 587 nanometers), Vd is the Abbe number (Abbenumber) of d light in corresponding lens combination, and k is quadric surface coefficient.First lens G1 of the imaging lens 100 of the first and second embodiments and the optical parametric of the second lens G2 meet above-mentioned relation formula (1) ~ (6) below.
First embodiment
Each optical module of the imaging lens 100 that first embodiment of the invention provides meets the condition of table 1 and table 2.
Table 1
| Optical surface | Face type | R(mm) | D(mm) | Nd | Vd |
| Object plane | Plane | Infinitely great | -- | -- | -- |
| Diaphragm 20 | Plane | Infinitely great | -0.04 | -- | -- |
| The thing end surfaces of the first lens G1 | Aspheric surface | 1.59 | 0.44 | 1.53 | 56.0 |
| The picture end surfaces of the first lens G1 | Aspheric surface | 59.65 | 0.47 | -- | -- |
| The thing end surfaces of the second lens G2 | Aspheric surface | -1.13 | 0.72 | 1.53 | 56.0 |
| The picture end surfaces of the second lens G2 | Aspheric surface | -0.62 | 0.06 | -- | -- |
| The thing end surfaces of the 3rd lens G3 | Aspheric surface | 3.25 | 0.52 | 1.63 | 23.4 |
| The picture end surfaces of the 3rd lens G3 | Aspheric surface | 0.86 | 0.85 | -- | -- |
| The thing end surfaces of optical filter 98 | Plane | Infinitely great | 0.30 | 1.52 | 58.6 |
| The picture end surfaces of optical filter 98 | Plane | Infinitely great | 0.08 | -- | -- |
| Imaging surface 99 | Plane | Infinitely great | -- | -- | -- |
Table 2
Table 3
| F(mm) | F/No | 2ω |
| 2.38 | 2.46 | 61.69° |
The spherical aberration of the imaging lens 100 that the present embodiment provides, the curvature of field, distortion, aberration and MTF are respectively as shown in Fig. 2 to Fig. 6.Particularly, six curves illustrated in fig. 2 are respectively for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm), g line (wavelength is 435.8nm), the aberration value curve that h line (wavelength is 404.7nm) is observed.Can find out that the aberration value that imaging lens 100 pairs of visible rays (wavelength coverage is between 400nm-700nm) of the first embodiment produce controls within the scope of-0.05mm ~ 0.05mm by these three curves.As shown in Figure 3, curve T and S is respectively meridianal curvature of field (tangentialfieldcurvature) family curve and Sagittal field curvature (sagittalfieldcurvature) family curve.The meridianal curvature of field value of this imaging lens 100 and Sagittal field curvature value are controlled within the scope of-0.10mm ~ 0.10mm as seen from Figure 3.Further, the curve shown in Fig. 4 is the distortion performance curve of imaging lens 100, and as shown in Figure 4, the optical distortion amount of this imaging lens 100 is controlled in the scope of-2.00% ~ 2.00%.In addition, six curves illustrated in fig. 5 are respectively for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm), g line (wavelength is 435.8nm), the value of chromatism curve that h line (wavelength is 404.7nm) is observed.Can find out that the aberration value that imaging lens 100 pairs of visible rays (wavelength coverage is between 400nm-700nm) of the first embodiment produce controls within the scope of-5.00 μm ~ 5.00 μm by these six curves.In the present embodiment, the aberration corresponding to h line in these six curves has maximum magnitude value, is specially between-2.8 μm ~ 2.8 μm.Further, as shown in Figure 6, under 1/2 frequently (Nyquistfrequency) condition (1/2 frequency (half frequently) of the present embodiment is 180lp/mm), the MTF > 50% (as shown in curve mc) of central vision, the MTF > 30% (as shown in curve mp) of 0.8 visual field, the MTF of all the other visual fields between central vision and 0.8 visual field, then between 30% ~ 50% (as shown in curve mt).In sum, the imaging lens 100 that first embodiment of the invention provides can have high imaging quality (2 ω > 61.69 °).
Second embodiment
Each optical module of the imaging lens 100 that second embodiment of the invention provides meets the condition of table 4, table 5 and table 6.
Table 4
| Optical surface | Face type | R(mm) | D(mm) | Nd | Vd |
| Object plane | Plane | Infinitely great | -- | -- | -- |
| Diaphragm 20 | Plane | Infinitely great | -0.04 | -- | -- |
| The thing end surfaces of the first lens G1 | Aspheric surface | 1.61 | 0.42 | 1.53 | 56.0 |
| The picture end surfaces of the first lens G1 | Aspheric surface | 96.38 | 0.46 | -- | -- |
| The thing end surfaces of the second lens G2 | Aspheric surface | -1.09 | 0.72 | 1.53 | 56.0 |
| The picture end surfaces of the second lens G2 | Aspheric surface | -0.61 | 0.06 | -- | -- |
| The thing end surfaces of the 3rd lens G3 | Aspheric surface | 3.80 | 0.56 | 1.63 | 23.4 |
| The picture end surfaces of the 3rd lens G3 | Aspheric surface | 0.90 | 0.85 | -- | -- |
| The thing end surfaces of optical filter 98 | Plane | Infinitely great | 0.30 | 1.52 | 58.6 |
| The picture end surfaces of optical filter 98 | Plane | Infinitely great | 0.08 | -- | -- |
| Imaging surface 99 | Plane | Infinitely great | -- | -- | -- |
Table 5
Table 6
| F(mm) | F/No | 2ω |
| 2.39 | 2.82 | 61.67° |
The spherical aberration of the imaging lens 100 that the present embodiment provides, the curvature of field, distortion, aberration and MTF are respectively as shown in Fig. 7 to Figure 11.Particularly, six curves illustrated in fig. 7 are respectively for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm), g line (wavelength is 435.8nm), the aberration value curve that h line (wavelength is 404.7nm) is observed.Can find out that the aberration value that imaging lens 100 pairs of visible rays (wavelength coverage is between 400nm-700nm) of the first embodiment produce controls within the scope of-0.05mm ~ 0.05mm by these three curves.As shown in Figure 8, curve T and S is respectively meridianal curvature of field (tangentialfieldcurvature) family curve and Sagittal field curvature (sagittalfieldcurvature) family curve.The meridianal curvature of field value of this imaging lens 100 and Sagittal field curvature value are controlled within the scope of-0.10mm ~ 0.10mm as seen from Figure 3.Further, the curve shown in Fig. 9 is the distortion performance curve of imaging lens 100, and as shown in Figure 9, the optical distortion amount of this imaging lens 100 is controlled in the scope of-2.00% ~ 0%.In addition, six curves illustrated in fig. 10 are respectively for F line (wavelength is 486.1 nanometers (nm)), d line (wavelength is 587.6nm), C line (wavelength is 656.3nm), e line (wavelength is 546.1nm), g line (wavelength is 435.8nm), the value of chromatism curve that h line (wavelength is 404.7nm) is observed.Can find out that the aberration value that imaging lens 100 pairs of visible rays (wavelength coverage is between 400nm-700nm) of the second embodiment produce controls within the scope of-5.00 μm ~ 5.00 μm by these six curves.In the present embodiment, the aberration corresponding to h line in these six curves has maximum magnitude value, is specially between-2.8 μm ~ 2.8 μm.Further, as shown in figure 11, under 1/2 frequently (Nyquistfrequency) condition (1/2 frequency (half frequently) of the present embodiment is 180lp/mm), the MTF > 50% (as shown in curve mc) of central vision, the MTF > 30% (as shown in curve mp) of 0.8 visual field, the MTF of all the other visual fields between central vision and 0.8 visual field, then between 30% ~ 50% (as shown in curve mt).In sum, the imaging lens 100 that second embodiment of the invention provides can have high imaging quality (2 ω > 61.67 °).
It is noted that above-described embodiment is only preferred embodiment of the present invention, those skilled in the art also can do other change in spirit of the present invention.These changes done according to the present invention's spirit, all should be included within the present invention's scope required for protection.
Claims (7)
1. an imaging lens, this imaging lens comprises the first lens that has positive light coke successively from thing side to image side, second lens with positive light coke, and the 3rd lens with negative power, these first lens comprise a first surface towards object side and a second surface towards imaging surface side, these second lens comprise the 3rd surface towards object side and the 4th surface towards imaging surface side, 3rd lens comprise the 5th surface towards object side and the 6th surface towards imaging surface side, wherein, this imaging lens meets relational expression:
FB/TTL>0.30；
G1R2/F1>19.54
D1/D2<1.62；
-0.34>G1R2/F2>G2R1/F2>-0.68；
-0.42>G3R2/F3>G3R1/F3>-1.92；
Wherein, FB be the 6th surface with imaging surface along the bee-line on optical axis direction, TTL is the total length of imaging lens, G1R2 is the radius-of-curvature of second surface, F1 is the focal length of the first lens, D1 is along the distance on the direction of Vertical camera lens optical axis between the 4th surperficial effective diameter end points and the 4th centre of surface, D2 is being parallel to the distance on imaging lens optical axis direction between the 4th surperficial effective diameter end points and the 4th centre of surface, G2R1 is the radius-of-curvature on the 3rd surface, G2R2 is the radius-of-curvature on the 4th surface, G3R1 is the radius-of-curvature on the 5th surface, G3R2 is the radius-of-curvature on the 6th surface, F2 is the focal length of the second lens, F3 is the focal length of the 3rd lens.
2. imaging lens as claimed in claim 1, it is characterized in that, these second lens and the 3rd lens meet relational expression:
Vd2>53、Vd3<33；
Wherein, Vd2 is the Abbe number of the second lens, and Vd3 is the Abbe number of the 3rd lens.
3. imaging lens as claimed in claim 1, is characterized in that, this first surface, second surface, the 3rd surface, the 4th surface, the 5th surface, the 6th surface are respectively aspheric surface.
4. imaging lens as claimed in claim 1, is characterized in that, these first lens, the second lens select in polymkeric substance and glass that any one is made respectively.
5. imaging lens as claimed in claim 1, it is characterized in that, this imaging lens also comprises an optical filter, and this optical filter is arranged between the 3rd lens and this imaging surface.
6. imaging lens as claimed in claim 5, it is characterized in that, this optical filter is a cutoff filter.
7. imaging lens as claimed in claim 1, it is characterized in that, this imaging lens also comprises a diaphragm, and this diaphragm is arranged on the side of these first lens away from these the second lens.
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| CN109828346B (en) * | 2018-12-26 | 2024-04-02 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN116299973B (en) * | 2023-03-14 | 2024-07-09 | 湖北华鑫光电有限公司 | 3P type 500 ten thousand pixel mobile phone lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1576939A (en) * | 2003-07-11 | 2005-02-09 | 柯尼卡美能达精密光学株式会社 | Image pick-up lens, image pick-up unit, and mobile terminal provided with this image pick-up unit |
| CN101369045A (en) * | 2007-08-17 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Lens system |
| CN101430416A (en) * | 2006-11-08 | 2009-05-13 | 富士能株式会社 | Imaging lens having three-lens configuration, camera module, and portable terminal equipment |
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| JP3717488B2 (en) * | 2003-03-31 | 2005-11-16 | フジノン株式会社 | Single focus lens |
| JP2008096621A (en) * | 2006-10-11 | 2008-04-24 | Nidec Copal Corp | Imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1576939A (en) * | 2003-07-11 | 2005-02-09 | 柯尼卡美能达精密光学株式会社 | Image pick-up lens, image pick-up unit, and mobile terminal provided with this image pick-up unit |
| CN101430416A (en) * | 2006-11-08 | 2009-05-13 | 富士能株式会社 | Imaging lens having three-lens configuration, camera module, and portable terminal equipment |
| CN101369045A (en) * | 2007-08-17 | 2009-02-18 | 鸿富锦精密工业（深圳）有限公司 | Lens system |
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Effective date of registration: 20181211 Address after: No. 1216 Lanhua Road, Jincheng Economic Development Zone, Shanxi Province Patentee after: Sanying Super Precision Optoelectronics (Jincheng) Co.,Ltd. Address before: 518109, No. two, No. tenth, East Ring Road, Pinus tabulaeformis Industrial Zone, Longhua Town, Baoan District, Guangdong, Shenzhen, 2 Co-patentee before: HON HAI PRECISION INDUSTRY Co.,Ltd. Patentee before: HONG FU JIN PRECISION INDUSTRY (SHENZHEN) Co.,Ltd. |
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