CN102109660A - Image-capturing lens - Google Patents
Image-capturing lens Download PDFInfo
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- CN102109660A CN102109660A CN2009103123110A CN200910312311A CN102109660A CN 102109660 A CN102109660 A CN 102109660A CN 2009103123110 A CN2009103123110 A CN 2009103123110A CN 200910312311 A CN200910312311 A CN 200910312311A CN 102109660 A CN102109660 A CN 102109660A
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Abstract
The invention provides an image-capturing lens. The lens comprises a plurality of lenses, wherein, the lenses comprise a first lens with negative power, a second lens with negative power, a third lens with positive power, a fourth lens with negative power, a fifth lens with positive power and a sixth lens with positive power which are sequentially arranged from an object side to an image side; and each lens comprises an object side face arranged towards the object side and an image side face arranged towards the image side. The image-capturing lens meets the following conditional expressions: (1) R1 is more than 8mm and less than 12mm; (2) R2 is more than 1mm and less than 2mm; (3) Nd1 is more than 1.8 and less than 2; (4) vd1 is more than 30 and less than 50; (5) D1 is more than 0.8mm and less than 1.2mm; and (6) -f1 is more than 2 and less than 3, wherein, R1 is curvature radius of the object side face of the first lens; R2 is the curvature radius of the image side face of the first lens; Nd1 is the refractive index of the first lens; vd1 is the Abbe number of the first lens; D1 is the center thickness of the first lens; and f1 is the focal length of the first lens.
Description
Technical field
The present invention relates to imaging technique, particularly a kind of sampling image lens.
Background technology
Along with the development of imaging technique, on the increasing vehicle environment of sampling image lens in order to monitoring vehicle periphery has been installed, thereby guaranteed traffic safety.The characteristics that are arranged on the sampling image lens on the vehicle are big visual fields, small size.Can guarantee again that for reaching the little while of volume sampling image lens has enough field angle, the deviser often adopts non-spherical lens to realize.And the cost of development height of non-spherical lens, complex manufacturing technology, and the yield of product is lower.
Summary of the invention
In view of this, be necessary to provide a kind of small size, big field angle and the sampling image lens of being convenient to make.
It comprises a plurality of lens a kind of sampling image lens, described a plurality of lens are followed successively by first lens with negative power from the object side to image side, second lens with negative power, the 3rd lens with positive light coke, the 4th lens with negative power, have the 5th lens of positive light coke, and the 6th lens with positive light coke.Each described lens include one towards the thing side of thing side and one towards the picture side of picture side, this sampling image lens formula that satisfies condition wherein:
(1)8mm＜R1＜12mm；
(2)1mm＜R2＜2mm；
(3)1.8＜Nd1＜2；
(4)30＜vd1＜50；
(5)mm0.8＜D1＜1.2mm；
(6)2＜-f1＜3；
Wherein, R1 is the radius-of-curvature of the thing side of first lens; R2 is the radius-of-curvature of the picture side of first lens; Nd1 is the refractive index of first lens; Vd1 is the Abbe number of first lens; D1 is the center thickness of first lens; F1 is the focal length of first lens.
Sampling image lens of the present invention has effectively limited the thickness and the surface curvature degree of first lens by above-mentioned conditional (1) ~ (6).Thereby the volume that reduces sampling image lens has effectively increased field angle simultaneously.
Description of drawings
Fig. 1 is the optical texture synoptic diagram of sampling image lens of the present invention;
Fig. 2 is the longitudinal chromatic aberration curve map of sampling image lens among Fig. 1;
Fig. 3 is the lateral chromatic aberration curve map of sampling image lens among Fig. 1;
Fig. 4 is the curvature of field curve map of sampling image lens among Fig. 1;
Fig. 5 is the distortion curve figure of sampling image lens among Fig. 1;
Fig. 6 is the curve map of the camera lens margin and center brightness ratio of field angle in the sampling image lens among Fig. 1.
The main element symbol description
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100 |
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110 |
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120 |
| The |
130 |
| The |
140 |
| The |
150 |
| The |
160 |
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170 |
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180 |
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190 |
| Glass cover- |
210 |
Embodiment
See also Fig. 1, be the structural representation of the sampling image lens 100 of better embodiment of the present invention.This sampling image lens 100 comprises first lens 110, second lens 120 with negative power, the 3rd lens 130 with positive light coke with negative power from the object side to image side successively, has the 4th lens 140 of negative power, the 6th lens 150 that have the 5th lens 150 of positive light coke and have positive light coke.
Described first lens 110 are first surface S1 in the face of the thing side of thing side, in the face of being second surface S2 as side as the side.Described first surface S1 is the sphere that protrudes towards the thing side, and second surface S2 is the sphere with respect to picture side depression.
Described second lens 120 are the 3rd surperficial S3 in the face of the thing side of thing side, in the face of being the 4th surperficial S4 as side as the side.The described the 3rd surperficial S3 is the sphere that protrudes towards the thing side, and the 4th surperficial S4 is the sphere with respect to picture side depression.
Described the 3rd lens 130 are the 5th surperficial S5 in the face of the thing side of thing side, in the face of being the 6th surperficial S6 as side as the side.The described the 5th surperficial S5 is the sphere that protrudes towards the thing side, and the 6th surperficial S6 is the sphere that protrudes towards the picture side.
Described the 4th lens 140 are the 7th surperficial S7 in the face of the thing side of thing side, in the face of being the 8th surperficial S8 as side as the side.The described the 7th surperficial S7 is the sphere with respect to thing side depression, and the 8th surperficial S8 is with respect to the sphere of picture side depression.
Described the 5th lens 150 are the 9th surperficial S9 in the face of the thing side of thing side, in the face of being the tenth surperficial S10 as side as the side.The described the 9th surperficial S9 is the sphere that protrudes towards the thing side, and the tenth surperficial S10 is the sphere that protrudes towards the picture side.Wherein, the 4th lens 140 glue together mutually by the 9th surperficial S9 of its 8th surperficial S8 and the 5th lens 130.
Described the 6th lens 160 are the 11 surperficial S11 in the face of the thing side of thing side, in the face of being the 12 surperficial S12 as side as the side.The described the 11 surperficial S11 is the sphere that protrudes towards the thing side, and the 12 surperficial S12 is the sphere that protrudes towards the picture side.
Lose the burnt drawback that produces image blur for avoiding sampling image lens to produce under the environment of high temperature, first in the present embodiment to six lens 110 ~ 160 all adopt glass material.
In addition, for fear of the interference of parasitic light, and obtain suitable imaging scope, this sampling image lens 100 also comprises the diaphragm (aperturestop) 170 between the 7th surperficial S7 of the 6th a surperficial S6 who is arranged at the 3rd lens 130 and the 4th lens 20.
During sampling image lens 100 imagings, light is from the incident of thing side, successively through first to six lens 110 ~ 160 and image on the imaging surface 180.Optical sensing subassembly such as CCD or CMOS etc. are set at these imaging surface 180 places just can be obtained via the light of sampling image lens 100 transmissions and with the light of its acquisition and be converted into the electron image signal.In order to protect the optical sensing subassembly that is arranged on imaging surface 180 places and to filter infrared ray in the throw light, between described the 6th lens 160 and described imaging surface 180, also be provided with infrared fileter 190 and glass cover-plate 210.Described infrared fileter 190 and glass cover-plate 210 are designated as S13, S14, S15 and S16 successively by thing side to the surface as side.
For the sampling image lens 100 that obtains reduced size and have big field angle, described sampling image lens 100 formula that satisfies condition:
(1)8mm＜R1＜12mm；
(2)1mm＜R2＜2mm；
(3)1.8＜Nd1＜2；
(4)30＜vd1＜50；
(5)mm0.8＜D1＜1.2mm；
(6)2＜-f1＜3；
Wherein, R1 is the radius-of-curvature of the first surface S1 of first lens 110; R2 is the radius-of-curvature of the second surface S2 of first lens 110; Nd1 is the refractive index of first lens 110; Vd1 is the Abbe number of first lens 110; D1 is the length that the first surface S1 of first lens 110 is intercepted on the optical axis of described first lens 110 to second surface S2, the i.e. center thickness of first lens 110; F1 is the focal length of first lens 110.
The thickness and the surface curvature degree of first lens 110 effectively limited in above-mentioned conditional (1) ~ (6).Thereby, the volume that reduces sampling image lens 100 plays a positive role for being increased field angle.
Preferably, sampling image lens 100 formula that also satisfies condition:
(7)9.5mm＜R3＜11mm；
(8)1mm＜R4＜2mm；
(9)1.5＜Nd2＜1.6；
(10)40＜vd2＜60；
(11)0.3mm＜D2＜1mm；
(12)1.5＜-f2/-f1＜2；
Wherein, R3 is the radius-of-curvature of the 3rd surperficial S1 of second lens 120; R4 is the radius-of-curvature of the 4th surperficial S4 of second lens 120; Nd2 is the refractive index of second lens 120; Vd2 is the Abbe number of second lens 120; D2 is the length that the 3rd surperficial S3 to the four surperficial S4 of second lens 120 are intercepted on the optical axis of described second lens 120, the i.e. center thickness of second lens 120; F2 is the focal length of second lens 120.
The thickness and the surface curvature degree of second lens 120 effectively limited in above-mentioned conditional (7) ~ (12), limited the focal distance ratio between first lens 110 and second lens 120 simultaneously.Thereby further reduce the volume of sampling image lens 100 and the field angle that increases sampling image lens 100.
Preferably, sampling image lens 100 formula that also satisfies condition:
(13)2mm＜R5＜3mm；
(14)-9mm＜R6＜-7mm；
(15)1.8＜Nd3＜2；
(16)10＜vd3＜25；
(17)1mm＜D3＜1.5mm；
(18)1.5＜f3＜3；
Wherein, R5 is the radius-of-curvature of the 5th surperficial S5 of the 3rd lens 130; R6 is the radius-of-curvature of the 6th surperficial S6 of the 3rd lens 130; Nd3 is the refractive index of the 3rd lens 130; Vd3 is the Abbe number of the 3rd lens 130; D3 is the length that the 5th surperficial S5 to the six surperficial S6 of the 3rd lens 130 are intercepted on the optical axis of described the 3rd lens 130, the i.e. center thickness of the 3rd lens 130; F3 is the focal length of the 3rd lens 130.
The thickness and the surface curvature degree of the 3rd lens 130 effectively limited in above-mentioned conditional (13) ~ (18).Thereby further reduce the volume of sampling image lens 100 and the field angle that increases sampling image lens 100.
Preferably, sampling image lens 100 formula that also satisfies condition:
(19)-10mm＜R7＜-8mm；
(20)1mm＜R8＜2mm；
(21)1.8＜Nd4＜2；
(22)10＜vd4＜25；
(23)mm0.2≤D4＜0.4mm；
(24)4＜-f4＜5；
Wherein, R7 is the radius-of-curvature of the 7th surperficial S7 of the 4th lens 140; R8 is the radius-of-curvature of the 8th surperficial S8 of the 4th lens 140; Nd4 is the refractive index of the 4th lens 140; Vd4 is the Abbe number of the 4th lens 140; D4 is the length that the 7th surperficial S7 to the eight surperficial S8 of the 4th lens 140 are intercepted on the optical axis of described the 4th lens 140, the i.e. center thickness of the 4th lens 140; F4 is the focal length of the 4th lens 140.
The thickness and the surface curvature degree of the 4th lens 130 effectively limited in above-mentioned conditional (19) ~ (24).Thereby further reduce the volume of sampling image lens 100 and the field angle that increases sampling image lens 100.
Preferably, sampling image lens 100 formula that also satisfies condition:
(25)1mm＜R9＜2mm；
(26)-3mm＜R10＜-2mm；
(27)1.7＜Nd5＜1.8；
(28)10＜vd4＜25；
(29)mm1.5＜D5＜2mm；
(30)4＜-f5＜5；
Wherein, R9 is the radius-of-curvature of the 9th surperficial S9 of the 5th lens 150; R10 is the radius-of-curvature of the 9th surperficial S9 of the 5th lens 150; Nd5 is the refractive index of the 5th lens 150; Vd5 is the Abbe number of the 5th lens 150; D5 is the length that the 9th surperficial S9 to the ten surperficial S10 of the 5th lens 150 are intercepted on the optical axis of described the 5th lens 150, the i.e. center thickness of the 5th lens 150; F5 is the focal length of the 5th lens 150.
The thickness and the surface curvature degree of the 5th lens 150 effectively limited in above-mentioned conditional (25) ~ (30).Thereby further reduce the volume of sampling image lens 100 and the field angle that increases sampling image lens 100.
Preferably, sampling image lens 100 formula that also satisfies condition:
(31)6mm＜R11＜7mm；
(32)mm-16＜R12＜-15mm；
(33)1.8＜Nd6＜2；
(34)30＜vd6＜50；
(35)mm0.5＜D6＜1mm；
(36)5＜f6＜6；
Wherein, R11 is the radius-of-curvature of the 11 surperficial S11 of the 6th lens 160; R12 is the radius-of-curvature of the 12 surperficial S12 of the 6th lens 160; Nd6 is the refractive index of the 6th lens 160; Vd6 is the Abbe number of the 6th lens 160; D6 is the length that the 11 surperficial S11 to the 12 surperficial S12 of the 6th lens 160 are intercepted on the optical axis of described the 6th lens 160, the i.e. center thickness of the 6th lens 160; F6 is the focal length of the 6th lens 160.
The thickness and the surface curvature degree of the 6th lens 160 effectively limited in above-mentioned conditional (30) ~ (36).Thereby further reduce the volume of sampling image lens 100 and the field angle that increases sampling image lens 100.
Further specify sampling image lens 100 below in conjunction with subordinate list.Wherein, R is the radius-of-curvature on corresponding surface, D for corresponding surface to a back surface axle of (toward the picture side direction) go up apart from (two surfaces intercept the length of optical axis), SD is the radius of the optical surface of each lens.
Sampling image lens 100 satisfies the listed condition of table 1.
Table 1
| Optical surface | Face shape | R(mm) | D(mm) | SD |
| S1 | Sphere | 9.728558 | 0.990000 | 3.960000 |
| S2 | Sphere | 1.622552 | 1.000000 | 1.54000 |
| S3 | Sphere | 10.318704 | 0.40000 | 2.000000 |
| S4 | Sphere | 1.888920 | 0.103950 | 1.237500 |
| S5 | Sphere | 2.312640 | 1.108800 | 1.633500 |
| S6 | Sphere | -8.315252 | 0.212360 | 1.63500 |
| Diaphragm | Infinitely great | 0.100000 | 0.631354 | |
| S7 | Sphere | -9.068239 | 0.300000 | 1.20000 |
| S8 | Sphere | 1.700000 | 0 | 1.20000 |
| S9 | Sphere | 1.700000 | 1.851300 | 1.20000 |
| S10 | Sphere | -2.570995 | 0.049500 | 1.20000 |
| S11 | Sphere | 6.602906 | 0.792000 | 2.079000 |
| S12 | Sphere | -15.631692 | 0.297000 | 2.079000 |
| S13 | The plane | Infinitely great | 0.400000 | 1.700224 |
| S14 | The plane | Infinitely great | 0.594000 | 1.753957 |
| S15 | The plane | Infinitely great | 0.550000 | 1.877266 |
| S16 | The plane | Infinitely great | 1.240886 | 1.954044 |
| Imaging surface | The plane | Infinitely great | 2.222333 |
Can draw from last table, the overall length of this sampling image lens 100 is controlled in the 10mm.
The family curve of the longitudinal chromatic aberration curve of sampling image lens 100, lateral chromatic aberration curve, curvature of field family curve and distortion is respectively as Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5.Among Fig. 2 and Fig. 3, it is longitudinal chromatic aberration curve and the lateral chromatic aberration curve that the light of 436 nanometers, 546 nanometers and 656 nanometers is produced through sampling image lens 100 that curve a, c and e represent wavelength respectively.As seen, in the present embodiment sampling image lens to the longitudinal chromatic aberration that visible light (400-700 nanometer) produces be controlled in-0.1mm ~ 0.1mm in, lateral chromatic aberration is controlled in-5um ~ 5um.Among Fig. 4, it is that the light of 436 nanometers, 546 nanometers and 656 nanometers is through meridianal curvature of field t (tangential field curvature) family curve that sampling image lens 100 produced and sagitta of arc curvature of field s (sagittal field curvature) family curve (down with) that curve a, c and e represent wavelength respectively.As seen, meridianal curvature of field value and sagitta of arc curvature of field value be controlled in-0.25mm ~ 0.10mm between.Among Fig. 4, curve is distortion performance curve (down together).As seen, maximum distortion amount is less than-58.8%.In addition, with reference to the relative brightness figure of Fig. 6 sampling image lens 100, wherein horizontal ordinate is an angle of half field-of view, and ordinate is the brightness ratio of relative central point on every side of sampling image lens 100.Thereby as seen, the relative exposure in the scope of big field angle (173 degree) is than all greater than 40%, thereby guarantees that this sampling image lens 100 still has enough brightness at the image of field angle scope greatly.
Be noted that above-mentioned embodiment only is better embodiment of the present invention, those skilled in the art also can do other variation in spirit of the present invention.The variation that these are done according to spirit of the present invention, all should be included in the present invention's scope required for protection in.
Claims (12)
1. sampling image lens, it comprises a plurality of lens, described a plurality of lens are followed successively by first lens with negative power from the object side to image side, second lens with negative power have the 3rd lens of positive light coke, the 4th lens with negative power, the 5th lens with positive light coke, and the 6th lens with positive light coke, each described lens include one towards the thing side of thing side and one towards the picture side of picture side, this sampling image lens formula that satisfies condition wherein;
(1)8mm＜R1＜12mm；
(2)1mm＜R2＜2mm；
(3)1.8＜Nd1＜2；
(4)30＜vd1＜50；
(5)mm0.8＜D1＜1.2mm；
(6)2＜-f1＜3；
Wherein, R1 is the radius-of-curvature of the thing side of first lens; R2 is the radius-of-curvature of the picture side of first lens; Nd1 is the refractive index of first lens; Vd1 is the Abbe number of first lens; D1 is the center thickness of first lens; F1 is the focal length of first lens.
2. sampling image lens as claimed in claim 1 is characterized in that this sampling image lens formula that also satisfies condition:
(7)9.5mm＜R3＜11mm；
(8)1mm＜R4＜2mm；
(9)1.5＜Nd2＜1.6；
(10)40＜vd2＜60；
(11)0.3mm＜D2＜1mm；
(12)1.5＜-f2/-f1＜2；
Wherein, R3 is the radius-of-curvature of the thing side of second lens; R4 is the radius-of-curvature of the picture side of second lens; Nd2 is the refractive index of second lens; Vd2 is the Abbe number of second lens; D2 is the center thickness of second lens; F2 is the focal length of second lens.
3. sampling image lens as claimed in claim 2 is characterized in that this sampling image lens formula that also satisfies condition:
(13)2mm＜R5＜3mm；
(14)-9mm＜R6＜-7mm；
(15)1.8＜Nd3＜2；
(16)10＜vd3＜25；
(17)1mm＜D3＜1.5mm；
(18)1.5＜f3＜3；
Wherein, R5 is the radius-of-curvature of the thing side of the 3rd lens; R6 is the radius-of-curvature of the picture side of the 3rd lens; Nd3 is the refractive index of the 3rd lens; Vd3 is the Abbe number of the 3rd lens; D3 be the 3rd lens center thickness; F3 is the focal length of the 3rd lens.
4. sampling image lens as claimed in claim 3 is characterized in that this sampling image lens formula that also satisfies condition:
(19)-10mm＜R7＜-8mm；
(20)1mm＜R8＜2mm；
(21)1.8＜Nd4＜2；
(22)10＜vd4＜25；
(23)mm0.2≤D4＜0.4mm；
(24)4＜-f4＜5；
Wherein, R7 is the radius-of-curvature of the thing side of the 4th lens; R8 is the radius-of-curvature of the picture side of the 4th lens; Nd4 is the refractive index of the 4th lens; Vd4 is the Abbe number of the 4th lens; D4 is the center thickness of the 4th lens; F4 is the focal length of the 4th lens.
5. sampling image lens as claimed in claim 4 is characterized in that this sampling image lens formula that also satisfies condition:
(25)1mm＜R9＜2mm；
(26)-3mm＜R10＜-2mm；
(27)1.7＜Nd5＜1.8；
(28)10＜vd4＜25；
(29)mm1.5＜D5＜2mm；
(30)4＜-f5＜5；
Wherein, R9 is the radius-of-curvature of the thing side of the 5th lens; R10 is the radius-of-curvature of the picture side of the 5th lens; Nd5 is the refractive index of the 5th lens; Vd5 is the Abbe number of the 5th lens; D5 is the center thickness of the 5th lens; F5 is the focal length of the 5th lens.
6. sampling image lens as claimed in claim 5 is characterized in that this sampling image lens formula that also satisfies condition:
(31)6mm＜R11＜7mm；
(32)mm-16＜R12＜-15mm；
(33)1.8＜Nd6＜2；
(34)30＜vd6＜50；
(35)mm0.5＜D6＜1mm；
(36)5＜f6＜6；
Wherein, R11 is the radius-of-curvature of the thing side of the 6th lens; R12 is the radius-of-curvature of the 6th lens as the side; Nd6 is the refractive index of the 6th lens; Vd6 is the Abbe number of the 6th lens; D6 is the center thickness of the 6th lens; F6 is the focal length of the 6th lens.
7. sampling image lens as claimed in claim 6 is characterized in that: described the 4th lens glue together mutually by its thing side as side and the 5th lens.
8. sampling image lens as claimed in claim 7 is characterized in that: this sampling image lens also comprises a diaphragm, and this diaphragm is arranged on the thing side of described the 4th lens and looking like between the side of the 3rd lens.
9. as any described sampling image lens of claim 1 to 8, it is characterized in that: described lens all adopt glass material.
10. sampling image lens as claimed in claim 9 is characterized in that: the effective optical surface of described lens is sphere.
11. sampling image lens as claimed in claim 10 is characterized in that: this camera lens module also comprises optical filter and the glass cover-plate that is arranged on behind the 6th eyeglass.
12. sampling image lens as claimed in claim 11 is characterized in that: the overall length of described sampling image lens is less than 10mm.
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| CN105607222A (en) * | 2014-11-18 | 2016-05-25 | 三星电机株式会社 | Lens module |
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| CN113359280A (en) * | 2021-06-17 | 2021-09-07 | 天津欧菲光电有限公司 | Optical lens, camera module and electronic equipment |
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