CN102928963A - Taking lens - Google Patents
Taking lens Download PDFInfo
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- CN102928963A CN102928963A CN201110229900XA CN201110229900A CN102928963A CN 102928963 A CN102928963 A CN 102928963A CN 201110229900X A CN201110229900X A CN 201110229900XA CN 201110229900 A CN201110229900 A CN 201110229900A CN 102928963 A CN102928963 A CN 102928963A
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- image lens
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Abstract
The invention discloses a taking lens, which sequentially comprises a first lens group with positive focal power, a second lens group with positive focal power and an imaging surface from an object side to an image side. The first lens group comprises at least one first lens with positive focal power. The second lens group comprises at least one second lens with positive focal power. Each first lens comprises a first surface close to the object side and a second surface close to the image side from the object side to the image side. The taking lens is in line with conditional expressions that: (1) D/TTL is more than 1.18; (2) F1/F is more than 1.5 and less than 1.7; and (3) R2/(F1)<2> is more than 0.15 and less than 0.25, wherein D is the diameter of an effective imaging range of the taking lens; TTL is the total length of the optical axis of the taking lens; F1 is the focal length of the first lens group; F1 is the total focal length of the taking lens; R2 is the radius of curvature of the second surface; and F1 is the focal length of the first lens group. The taking lens in line with the conditional expressions is high in imaging quality and favorable for miniaturization.
Description
Technical field
The present invention relates to a kind of sampling image lens.
Background technology
Development along with science and technology, electronic product is constantly towards compact and multi-functional future development, and in the electronic product, possessed outside the image-taking device such as digital camera, computing machine etc., even the devices such as mobile phone or personal digital assistance (PDA) also have the demand that adds image-taking device; And for easy to carry and meet the demand of hommization, image-taking device not only needs to have good image quality, also needs less Yu lower cost simultaneously, and the while can effectively promote the application of this image-taking device.
And because the material selectivity of traditional sphere abrading glass lens is more, and aberration is comparatively favourable for revising, widely industry is used, but when sphere abrading glass lens were applied in less and visual angle (Wide-angle) the larger situation of numerical aperture (F Number), the correction of the aberrations such as spherical aberration is difficulty.And in order to improve the shortcoming of above-mentioned traditional sphere abrading glass lens, present image-taking device is existing to be used aspherical plastic lens or uses aspheric surface moulded glass sheet, to obtain better image quality, but the structure of above-mentioned optical viewfinder, lens length is excessive, make image-taking device can't have smaller size smaller or lower cost, be difficult for satisfying the compact requirement of electronic product.
Summary of the invention
In view of this, be necessary to provide a kind of image quality good and be beneficial to the sampling image lens of miniaturization.
A kind of sampling image lens, from the thing side to comprising successively as side: a first lens group, with positive light coke has the second lens combination and an imaging surface of positive light coke, described first lens group comprises at least one first lens with positive light coke, described the second lens combination comprises that at least one has the second lens of positive light coke, described first lens is from the thing side to comprising as side near the first surface of thing side and near the second surface of picture side, this sampling image lens formula that meets the following conditions:
(1)D/TTL>1.18；(2)1.5<F1/F<1.7；（3）0.15<R2/(F1)
2<0.25；
Wherein, D is the effective areas imaging diameter of sampling image lens; TTL is the optical axis overall length of sampling image lens, and F1 is the focal length of first lens group; F is total focal length of sampling image lens; R2 is the radius-of-curvature of second surface; F1 is the focal length of first lens group.
Satisfy the sampling image lens of above-mentioned condition, image quality is good and be beneficial to miniaturization.
Description of drawings
The structural representation of the sampling image lens that Fig. 1 provides for first embodiment of the invention;
Fig. 2 is the spherical aberration figure of the sampling image lens among Fig. 1;
Fig. 3 is the curvature of field figure of the sampling image lens among Fig. 1;
Fig. 4 is the distortion figure of the sampling image lens among Fig. 1;
The structural representation of the sampling image lens that Fig. 5 provides for second embodiment of the invention;
Fig. 6 is the spherical aberration figure of the sampling image lens among Fig. 5;
Fig. 7 is the curvature of field figure of the sampling image lens among Fig. 5;
Fig. 8 is the distortion figure of the sampling image lens among Fig. 5.
The main element symbol description
| |
100、100a |
| The |
10 |
| The |
20 |
| |
30 |
| |
40 |
| |
11 |
| The |
12 |
| |
15 |
| Optical axis | X |
| First surface | S1 |
| Second surface | S2 |
| The 3rd surface | S3 |
| The 4th surface | S4 |
| The 5th surface | S5 |
| The 6th surface | S6 |
Following embodiment further specifies the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described in further detail.
See also Fig. 1, the sampling image lens 100 that it provides for first embodiment of the invention.This sampling image lens 100 comprises successively from thing side to picture side (near imaging surface): a first lens group 10, with positive light coke has the second lens combination 20, an optical filter 30, and the imaging surface 40 of positive light coke.
Described first lens group 10 comprises that at least one has the first lens 11 of positive light coke.Described first lens 11 is from the thing side to comprising as side near the first surface S1 of thing side and near the second surface S2 as side.This first surface S1 protrudes second surface S2 then to first lens 11 inner recess to object one side, and first, second surperficial S1, S2 all are aspheric surfaces.Described first lens 11 is made by plastic material.
Described sampling image lens 100 is provided with diaphragm 15 (Aperture stop) at the side of the first surface S1 of close described first lens 11, with respect to diaphragm 15 symmetries, effectively reduce the impact of coma (coma) with the one-piece construction that guarantees sampling image lens 100; Simultaneously restriction enters the luminous flux of the second lens combination 20 through the light of first lens group 10, and allows through the light cone after the first lens group 10 more symmetrically, and the coma of sampling image lens 100 is revised.
Described the second lens combination 20 comprises at least one the second lens 12 with positive light coke.Described the second lens 12 are from the thing side to comprising as side near the 3rd surperficial S3 of thing side and near the 4th surperficial S4 as side.Described the 3rd, the 4th surperficial S3, S4 all are aspheric surfaces.The 3rd surperficial S3 near near the optical axis X be to object one side protrude the 4th surperficial S4 near near the optical axis X then to the second lens 12 inner recess, described the second lens 12 are made by plastic material.
Described optical filter 30 is from the thing side to comprising as side near the 5th surperficial S5 of thing side and near the 6th surperficial S6 as side.
The sampling image lens 100 of present embodiment can be applicable to camera or video camera.The described sampling image lens 100 Shi ﹕ that meets the following conditions
(1)D/TTL>1.18。
Wherein, D is sampling image lens 100 effective areas imaging diameters; TTL is the optical axis overall length of sampling image lens 100.
The formula that satisfies condition (1) can effectively limit the total length of this sampling image lens 100, realizes system's miniaturization, and can the effective areas imaging of limited restriction and the relativeness of sampling image lens 100 overall lengths.
Preferably, sampling image lens 100 also meets the following conditions:
(2)1.5<F1/F<1.7；（3）0.15<R2/(F1)
2<0.25。
Wherein, F1 is the focal length of first lens group 10; F is total focal length of sampling image lens 100; R2 is the radius-of-curvature of second surface S2; F1 is the focal length of first lens group 10.
The image quality of described sampling image lens 100 can be improved in the formula that satisfies condition (2) and (3).
Preferably, sampling image lens 100 also meets the following conditions:
（4）0.5<R4/F2<0.75；（5）0.7<H31/H32<0.85；(6)0.6<H41/H42<0.7。
Wherein, F2 is the focal length of the second lens combination 20; R4 is the radius-of-curvature of the 4th surperficial S4; H31 is that the horizontal peak of the 3rd surperficial S3 is to the vertical height of the optical axis X of sampling image lens 100; H32 is the significant height of the 3rd surperficial S3; H41 is that the horizontal peak of the 4th surperficial S4 is to the optical axis X vertical height of sampling image lens 100; H42 is the significant height of the 4th surperficial S4.
The formula that satisfies condition (4) to (6) can improve the image quality of described sampling image lens 100, and the shape and structure of further standard the second lens 12.
Preferably, sampling image lens 100 also meets the following conditions:
（7）1.25<L1/L2<1.6。
Wherein, L1 is the center thickness of first lens 11; L2 is the center thickness of the second lens 12.
The formula that satisfies condition (7) can the described first lens 11 of standard and the thickness relativeness of the second lens 12.
Preferably, sampling image lens 100 also meets the following conditions:
(8) Vd1〉50 and Vd2 50.
Wherein, Vd1 be first lens 11 material Abbe number and Vd2 is the Abbe number of the material of the second lens 12.
The formula that satisfies condition (8) can make between the image quality of sampling image lens 100 and the aberration and average out a little.
Take the lens surface center as initial point, optical axis is the x axle, and the aspheric surface face type expression formula of lens surface is:
Wherein, c is the curvature at specular surface center,
Be the height from the optical axis to the lens surface, k is the quadric surface coefficient,
It is the aspheric surface face type coefficient on i rank.By table 1 is seen also hereinafter to table 4() the above-mentioned expression formula of data substitution, can know the aspherical shape of lens surface.
In the present embodiment, each optical element of sampling image lens 100 satisfies the condition of table 1 and table 2, and wherein i represents i lens surface beginning from the thing side; Ri represents the radius-of-curvature of i lens surface beginning from the thing side; Axial distance between i lens surface to the i+1 lens surface that Di represents to begin from the thing side; Ni represents the refractive index of i lens surface beginning from the thing side; Vi represents the Abbe number of i lens surface beginning from the thing side; Ki represents the quadratic curvature of i lens surface beginning from the thing side.The focal length of described first lens group 10 is 2.02; The focal length of described the second lens combination 20 is 2.5; Total focal length of whole sampling image lens 100 is 1.35.
Table 1
| The surface | Lens surface | ri(mm) | Di(mm) | ni | vi | ki |
| Diaphragm | -- | Infinitely great | -0.026 | -- | -- | -- |
| S1 | Aspheric surface | 0.567 | 0.497 | 1.53 | 55.8 | -26.9 |
| S2 | Aspheric surface | 0.835 | 0.190 | -- | -- | -12.1 |
| S3 | Aspheric surface | 0.750 | 0.317 | 1.53 | 55.8 | -25.8 |
| S4 | Aspheric surface | 1.466 | 0.441 | -- | -- | 0.21 |
| S5 | The plane | Infinitely great | 0.21 | 1.517 | 64 | -- |
| S6 | The plane | Infinitely great | 0.01 | -- | -- | -- |
| 40 | The plane | Infinitely great | -- | -- | -- | -- |
Table 2
| The surface asphericity coefficient | S1 | S2 | S3 | S4 |
| A4 | 1.14E+01 | -6.01E-01 | 1.18E+00 | -1.14E+00 |
| A6 | -5.00E+01 | 4.91E+01 | -2.21E+01 | -5.92E-01 |
| A8 | -5.10E+03 | -3.75E+02 | 8.73E+01 | 4.20E+00 |
| A10 | 1.47E+05 | -1.01E+02 | -6.00E+01 | -2.97E+01 |
| A12 | -1.41E+06 | 2.15E+04 | -7.31E+02 | 8.22E+01 |
| A14 | 3.27E+06 | -9.44E+04 | 1.78E+03 | -9.15E+01 |
| A16 | -- | -- | -- | -- |
The aberration of described sampling image lens 100, the curvature of field, distortion and aberration are respectively such as Fig. 2 and shown in Figure 4.Among Fig. 2 respectively for F line (wavelength value 486 nanometers (nm)), d line (wavelength value 587 nm), C line (wavelength value 656 nm) and the aberration value curve observed, the aberration value of generation is controlled in (0.1mm, 0.1mm) scope.Among Fig. 3, curve T and S are respectively meridianal curvature of field (tangential field curvature) family curve and Sagittal field curvature (sagittal field curvature) family curve (together lower).As seen, meridianal curvature of field value and Sagittal field curvature value are controlled in (0.1mm, 0.1mm) scope.And among Fig. 4 as seen, curve dis is distortion performance curve (lower with), amount of distortion is controlled in (2%, 2%) scope, can utilize the revisal of image mode.
The second embodiment
See also Fig. 8, sampling image lens 100 structures of the sampling image lens 100a in the second embodiment and the first embodiment are basic identical, and its difference is: each optical element of the sampling image lens 100a of the second embodiment satisfies the condition of table 4 and table 5.The focal length of described first lens group 10 is 2.2; The focal length of described the second lens combination 20 is 2.46; Total focal length of whole sampling image lens 100 is 1.34.
Table 3
| The surface | Lens surface | ri(mm) | Di(mm) | ni | vi | ki |
| Diaphragm | -- | Infinitely great | -0.026 | -- | -- | -- |
| S1 | Aspheric surface | 0.604 | 0.487 | 1.53 | 56 | -0.22 |
| S2 | Aspheric surface | 0.894 | 0.195 | -- | -- | -28.1 |
| S3 | Aspheric surface | 0.779 | 0.375 | 1.53 | 56 | -22.7 |
| S4 | Aspheric surface | 1.605 | 0.419 | -- | -- | -4.08 |
| S5 | The plane | Infinitely great | 0.21 | 1.517 | 64 | -- |
| S6 | The plane | Infinitely great | 0.01 | -- | -- | -- |
| 40 | The plane | Infinitely great | -- | -- | -- | -- |
Table 4
| The surface asphericity coefficient | S1 | S2 | S3 | S4 |
| A4 | -1.18E+00 | 1.26E+00 | 3.67E-01 | -7.04E-01 |
| A6 | 6.42E+01 | 1.10E+01 | -8.60E+00 | -1.03E+00 |
| A8 | -1.80E+03 | -6.71E+01 | 6.87E+00 | 5.56E+00 |
| A10 | 2.64E+04 | 9.71E+01 | 4.73E+01 | -1.84E+01 |
| A12 | -1.80E+05 | 1.28E+03 | 1.81E+02 | 5.76E+00 |
| A14 | 4.36E+05 | -3.91E+03 | -1.11E+03 | 8.58E+01 |
| A16 | -- | -- | -6.23E+02 | -1.31E+02 |
The aberration of described sampling image lens 100a, the curvature of field, distortion and aberration are extremely shown in Figure 8 such as Fig. 6 respectively.Among Fig. 6 respectively for F line (wavelength value 486 nanometers (nm)), d line (wavelength value 587 nm), C line (wavelength value 656 nm) and the aberration value curve observed, the aberration value of generation is controlled in (0.1mm, 0.1mm) scope.Among Fig. 7, curve T and S are respectively meridianal curvature of field (tangential field curvature) family curve and Sagittal field curvature (sagittal field curvature) family curve (together lower).As seen, meridianal curvature of field value and Sagittal field curvature value are controlled in (0.1mm, 0.1mm) scope.And among Fig. 8 as seen, curve dis is distortion performance curve (lower with), amount of distortion is controlled in (2%, 2%) scope, can utilize the revisal of image mode.
Described sampling image lens 100a can shorten the zoom stroke, and its optics overall length is dwindled, and realizes system's miniaturization, and its aberration is easy to compensation, obtains good image quality.
Although the present invention discloses as above with preferred embodiments,, it is not to limit the present invention, and in addition, those skilled in the art can also do other variation etc. in spirit of the present invention.Certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (10)
1. sampling image lens, from the thing side to comprising successively as side: a first lens group, with positive light coke has the second lens combination and an imaging surface of positive light coke, described first lens group comprises at least one first lens with positive light coke, described the second lens combination comprises that at least one has the second lens of positive light coke, described first lens is from the thing side to comprising as side near the first surface of thing side and near the second surface of picture side, this sampling image lens formula that meets the following conditions:
(1)D/TTL>1.18；(2)1.5<F1/F<1.7；（3）0.15<R2/(F1)
2<0.25；
Wherein, D is the effective areas imaging diameter of sampling image lens; TTL is the optical axis overall length of sampling image lens, and F1 is the focal length of first lens group; F is total focal length of sampling image lens; R2 is the radius-of-curvature of second surface; F1 is the focal length of first lens group.
2. sampling image lens as claimed in claim 1 is characterized in that, described sampling image lens is provided with diaphragm at the side of the first surface of close described first lens.
3. sampling image lens as claimed in claim 1 is characterized in that, the first surface of described first lens is to protrude second surface then to the first lens inner recess to object one side, and first surface and second surface are aspheric surface.
4. sampling image lens as claimed in claim 1 is characterized in that, described the second lens are from the thing side to comprising that as side this zoom-lens system satisfies following condition near the 3rd surface of thing side and near the 4th surface as side:
（4）0.5<R4/F2<0.75；（5）0.7<H31/H32<0.85；(6)0.6<H41/H42<0.7；
Wherein, F2 is the focal length of the second lens combination; R4 is the radius-of-curvature on the 4th surface; H31 is that the 3rd surface level peak is to the vertical height of the optical axis of sampling image lens; H32 is the significant height on the 3rd surface; H41 is that the 4th surface level peak is to the optical axis vertical height of sampling image lens; H42 is the significant height on the 4th surface.
5. sampling image lens as claimed in claim 4 is characterized in that, the 3rd surface near near the optical axis be to object one side protrude the 4th surface near near the optical axis X then to the second lens inner recess.
6. sampling image lens as claimed in claim 1 is characterized in that, this zoom-lens system satisfies following condition:
（7）1.25<L1/L2<1.6；
Wherein, L1 is the center thickness of first lens; L2 is the center thickness of the second lens.
7. sampling image lens as claimed in claim 1 is characterized in that, this zoom-lens system satisfies following condition:
(8) Vd1〉50 and Vd2 50;
Wherein, Vd1 be first lens material Abbe number and Vd2 is the Abbe number of the material of the second lens.
8. sampling image lens as claimed in claim 1 is characterized in that, described sampling image lens further comprises an optical filter, and described optical filter is arranged between described the second lens and the imaging surface.
9. sampling image lens as claimed in claim 1 is characterized in that, described first, second lens are made by plastic material and are non-spherical lens.
10. sampling image lens as claimed in claim 1 is characterized in that, described sampling image lens is applied to camera or video camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110229900XA CN102928963A (en) | 2011-08-11 | 2011-08-11 | Taking lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110229900XA CN102928963A (en) | 2011-08-11 | 2011-08-11 | Taking lens |
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| Publication Number | Publication Date |
|---|---|
| CN102928963A true CN102928963A (en) | 2013-02-13 |
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ID=47643800
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110229900XA Pending CN102928963A (en) | 2011-08-11 | 2011-08-11 | Taking lens |
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| Country | Link |
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| CN (1) | CN102928963A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003329922A (en) * | 2002-05-10 | 2003-11-19 | Seiko Epson Corp | Image pickup lens |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
| CN1641396A (en) * | 2004-01-16 | 2005-07-20 | 里程碑株式会社 | Imaging lens |
| JP2009047836A (en) * | 2007-08-17 | 2009-03-05 | Fujinon Corp | Optical lens, optical system unit and optical apparatus |
| JP2010117669A (en) * | 2008-11-14 | 2010-05-27 | Smk Corp | Single focus lens |
| CN101957494A (en) * | 2009-07-14 | 2011-01-26 | 夏普株式会社 | Imaging lens system and manufacture method thereof and photographing module and manufacture method thereof |
-
2011
- 2011-08-11 CN CN201110229900XA patent/CN102928963A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003329922A (en) * | 2002-05-10 | 2003-11-19 | Seiko Epson Corp | Image pickup lens |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
| CN1641396A (en) * | 2004-01-16 | 2005-07-20 | 里程碑株式会社 | Imaging lens |
| JP2009047836A (en) * | 2007-08-17 | 2009-03-05 | Fujinon Corp | Optical lens, optical system unit and optical apparatus |
| JP2010117669A (en) * | 2008-11-14 | 2010-05-27 | Smk Corp | Single focus lens |
| CN101957494A (en) * | 2009-07-14 | 2011-01-26 | 夏普株式会社 | Imaging lens system and manufacture method thereof and photographing module and manufacture method thereof |
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Application publication date: 20130213 |