CN101986183B - Optical lens assembly - Google Patents
Optical lens assembly Download PDFInfo
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- CN101986183B CN101986183B CN200910109070XA CN200910109070A CN101986183B CN 101986183 B CN101986183 B CN 101986183B CN 200910109070X A CN200910109070X A CN 200910109070XA CN 200910109070 A CN200910109070 A CN 200910109070A CN 101986183 B CN101986183 B CN 101986183B
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Abstract
The invention relates to the field of optics and provides an optical lens assembly. The optical lens assembly comprises a first lens and a second lens which are coaxial and are arranged from an object side to an image side in turn, and a fixed diaphragm which is positioned on the rear of the second lens, wherein the first lens is provided with a first convex and aspherical surface which faces the object side and a second concave and aspherical surface which faces the image side; and the second lens is provided with a third convex and aspherical surface which faces the object side and a fourth convex and aspherical surface which faces the image side. The optical lens assembly meets the following conditions that: L/f is more than 3.3, f1 is less than 0 and f2 is more than 0, wherein f is an effective focal distance value of the whole optical lens assembly; L is the total length of an optical system; f1 is an effective focal distance value of the first lens and f2 is an effective focal distance value of the second lens. The optical lens assembly is provided with only two lenses with negative and positive diopters, can collect more edge rays as possible, effectively improves the image surface brightness, reduces an emergence angle of a principal ray of the system and well corrects the off-axis aberration.
Description
Technical field
The present invention relates to optical device, be specifically related to a kind of optical lens assembly.
Background technology
In digital image-forming equipment, the optical imagery camera lens is particularly important assembly, and the picture element of camera lens has directly determined the imaging performance of digital image-forming equipment.Existing optical imagery camera lens series products is often paid attention to outstanding image quality, and less to receiving the light quantity concern, the clear aperature of acquiescence is F.NO=2.8 in the industry.Regenerate and be accompanied by digital product continual renovation simultaneously, the development of sensor technology, thereby also force lens design constantly to have breakthrough, and can reach bigger logical light quantity, to obtain camera, keep watch on the equipment application facet and obtain better effect at PC.Therefore, F.NO is that the lens design of the big aperture of the diaphragm such as 2.0,1.8 grades will obtain increasing attention.But in optical design; The big aperture of the diaphragm means that also light beam more is difficult to effective focusing, more parasitic light and comprehensive aberration, how effective anaberration when guaranteeing big logical light quantity; Obtain good imaging effect; And reduce production costs as much as possible, possess good processability, adapting to industrial large quantities of volume productions will be the difficult point and the emphasis of optical design.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that overcomes prior art, and a kind of optical lens assembly is provided, and it is big to satisfy logical light quantity, and the while is correcting various aberrations effectively.
Technical scheme provided by the invention is; A kind of optical lens assembly; Comprise lens combination and fixed aperture, wherein, said lens combination comprises first lens and second lens coaxial and that be arranged in order from object space to picture side; Said first lens have towards the protruding aspheric first surface of object space and towards the recessed aspheric second surface of picture side, and second lens have protruding aspheric the 4th surface that reaches towards picture side towards the protruding the aspheric the 3rd surperficial 21 of object space; First lens have negative diopter, and second lens have positive diopter; Said fixed aperture is positioned at the 4th surface of second lens and goes up the back image space that perhaps is positioned at second lens; Said optical lens assembly meets the following conditions:
L/f＞3.3；f1＜0；f2＞0；
Wherein f is the effective focal length value of whole optical lens assembly; L is the optical system length overall; F1 is the effective focal length value of first lens; F2 is the effective focal length value of second lens.
The invention has the beneficial effects as follows: only adopt two lens and fixed aperture, negative, positive diopter combinations is adopted in four aspheric surface designs; Its first lens front surface is protruding in object space; The surface is protruding in object space behind first lens, and the second lens front surface is protruding in object space, and the surface is protruding in picture side behind second lens; Can reduce system's chief ray emergence angle, and make off-axis aberration obtain well-corrected.After diaphragm leans on, less spherical aberration and astigmatism that can be to a certain degree.Simultaneously, diaphragm is near imaging surface, and the emergent ray CRA (chief ray emergence angle) that helps through imaging system can be as far as possible little, and the brightness of image of marginal ray is also had certain lifting effect.Diaphragm is in the rear of all eyeglasses near imaging surface, and its first lens are bending curvature to imaging surface, effectively accept marginal ray, and when satisfying the large aperture diaphragm, marginal ray still can better polymerization.
Description of drawings
Fig. 1 is the structural representation of optical lens assembly embodiment one of the present invention;
Fig. 2 is the structural representation of optical lens assembly embodiment two of the present invention;
Optical lens assembly MTF (optical transfer function) figure of Fig. 3 embodiment two;
The optical lens assembly curvature of field synoptic diagram of Fig. 4 embodiment two;
The optical lens assembly distortion synoptic diagram of Fig. 5 embodiment two;
Fig. 6 is the optical assembly structure synoptic diagram of optical lens assembly embodiment three of the present invention;
Optical lens assembly MTF (optical transfer function) figure of Fig. 7 embodiment three;
The optical lens assembly curvature of field synoptic diagram of Fig. 8 embodiment three;
The optical lens assembly distortion synoptic diagram of Fig. 9 embodiment three.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Embodiment one:
As shown in Figure 1; A kind of optical lens assembly that the embodiment of the invention provides; Comprise lens combination and fixed aperture 3; Said lens combination comprises first lens 1 and second lens 2 coaxial and that be arranged in order to picture side from object space, and said first lens 1 have to have towards the 3rd surperficial 21 of object space towards the first surface 11 of object space and towards second surface 12, the second lens 2 of picture side and reach towards the 4th surperficial 22 of picture side; Above-mentioned first surface 11 is aspheric surface with second surface 12; Said first surface 11 is a convex surface, and second surface 12 is a concave surface; The 21 and the 4th surface 22, above-mentioned the 3rd surface is aspheric surface; Said the 3rd surface 21 is a convex surface, and the 4th surface 22 is a convex surface; First lens 1 have negative diopter on the whole, and second lens 2 have positive diopter on the whole.Said fixed aperture 3 is positioned at the 4th surface of second lens 2 and goes up the back image space that perhaps is positioned at second lens 2; Said optical lens assembly meets the following conditions:
L/f＞3.3；f1＜0；f2＞0；
Wherein f is the effective focal length value of whole optical lens assembly; L is the optical system length overall; F1 is the effective focal length value of first lens; F2 is the effective focal length value of second lens; The qualification of the relation between lens assembly length overall and each the lens effective focal length value is being satisfied under the wide-aperture prerequisite, has shortened the length overall of camera lens, and to each aberration, has carried out good rectification, has obtained optical property preferably.
The optical lens assembly of the embodiment of the invention is wide-aperture optical design, and diaphragm is positioned at the back of second lens, less spherical aberration and astigmatism that can be to a certain degree.Simultaneously, diaphragm is near imaging surface, and the emergent ray CRA (chief ray emergence angle) that helps through imaging system can be as far as possible little, and the brightness of image of marginal ray is also had certain lifting effect.Diaphragm is in the rear of all eyeglasses near imaging surface, and its first lens are bending curvature to imaging surface, effectively accept marginal ray, makes under the prerequisite of large aperture diaphragm, and marginal ray still can better polymerization.
Further, the material of said first lens can also can be optical glass for optical plastic; Said second lens material can also can be optical glass for optical plastic.
Further, optical lens assembly of the present invention also comprises optical filter, and said optical filter is not shown in Fig. 1.Said optical filter has towards the front surface of object space with towards the back surface of picture side.Said optical filter is a glass plate, and the equal plating of the front and rear surfaces of glass plate has that one deck is infrared to come from the IR in the object reflection ray by filter membrane (IR-cut Coating) with filtering, thereby improves image quality.
Further, said aspheric pictograph closes following formula:
Wherein: z is for being starting point with each aspheric surface and optical axes crosspoint, the axial axial value of vertical light, and k is the quadric surface coefficient, c is the minute surface curvature of centre, c=1/R, wherein R is a minute surface curvature of centre radius, r is the minute surface centre-height; a
1, a
2, a
3, a
4, a
5, a
6, a
7, a
8Be asphericity coefficient.
The invention has the beneficial effects as follows: the fixed aperture after it adopts two lens and is positioned at lens; Four aspheric surface designs are adopted positive and negative diopter combinations, thus; Can bring more marginal ray as far as possible together; Effectively increase image planes brightness, in the system of large aperture diaphragm, still can be good at polymeric edge light.Carry out good rectification, obtained optical property preferably, and be easy to processing, help cost and reduce.
Embodiment two:
Fig. 2 is the structural representation of optical lens assembly embodiment two of the present invention, with reference to Fig. 2, proposes the second embodiment of the present invention, and present embodiment is on the basis of embodiment one, and the correlation parameter that has further proposed lens assembly is following:
Lens parameters:
| Type | Radius-of-curvature (R) | Quadric surface coefficient (k) | Thickness (dmm) |
| First surface | 8.074533 | -61.72694 | 2.80 |
| Second surface | -5.721327 | 13.73578 | 2.05 |
| The 3rd surface | -9.945894 | 91.41678 | 0.9 |
| The 4th surface | -1.92936 | -2.27452 | 0.1 |
| The optical filter front surface | 0.9 | ||
| Surface behind the optical filter | 2.0 | ||
| Image planes | 0 |
Asphericity coefficient:
First surface: (aspheric surface)
a
1：-0.12711201
a
2：0.022288763
a
3：-0.001871822
a
4：6.199145e-005
a
5：2.8747284e-005
a
6：-5.9170367e-006
a
7：4.9221476e-007
a
8：-1.5570923e-008
Second surface: (aspheric surface)
a
1：0.087099462
a
2：0.027467755
a
3：0.054744908
a
4：0.014972848
a
5：-0.11966942
a
6：0.1500139
a
7：-0.078355407
a
8：0.015828352
The 3rd surface (aspheric surface):
a
1：0.21184653
a
2：0.067924825
a
3：-0.072321909
a
4：0.28656274
a
5：-0.32760408
a
6：0.15827438
a
7：-0.024342645
a
8：0.039877215
The 4th surface (aspheric surface):
a
1：0.029597608
a
2：0.073319831
a
3：-0.25080069
a
4：1.0412002
a
5：-1.7387942
a
6：0.39323287
a
7：2.4360358
a
8：-2.1151889
In the table thickness d for this reason identity distance from next distance, the length overall L=8.72mm of this camera lens, effective focal length value f=2.3mm, the effective focal length value f1=-14.68mm of first lens, the effective focal length value f2=2.57mm of second lens, f-number FNO.=1.8.
In the present embodiment, preferably, the material of first lens is refractive index＞1.58, the optical material of dispersion values＜35, and wherein preferred plastic material PC (polycarbonate), refractive index and chromatic dispersion are respectively n1=1.585, v1=29.9; The material of second lens is refractive index＜1.55, the optical material of dispersion values＞50, and wherein preferred plastic material ZEONEX (armorphous polyolefin), refractive index and chromatic dispersion are respectively n1=1.525, v1=56.
Fig. 3 is modulation transfer function (ModulationTransfer Function the is called for short MTF) curve map of the optical lens assembly of the embodiment of the invention two, transverse axis representation space frequency among the figure, and unit: line is to every millimeter (lp/mm); The longitudinal axis is represented the numerical value of modulation transfer function (MTF), and the numerical value of said MTF is used for estimating the image quality of camera lens, and span is 0-1, and the MTF curve is high more representes that more directly the image quality of camera lens is good more, strong more to the reducing power of true picture.As can beappreciated from fig. 2; The MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very near; It shows: this lens assembly is in each visual field; The imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can both blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of can not occurring.
Fig. 4 and Fig. 5 are respectively the curvature of field and the distortion figure of the optical lens assembly of the embodiment of the invention two, can find out from Fig. 4 and Fig. 5, and the curvature of field of this optical lens assembly is less than 0.10mm, and distortion is less than 2%; Can cooperate the requirement of complementary metal oxide semiconductor (CMOS) (CMOS)/CCD (ChargeCoupled Device is called for short CCD) image sensor reception of main flow on the market.
Therefore embodiment provided by the invention can guarantee the effective polymerization to marginal ray under the situation of large aperture diaphragm, is that non-point image difference and aberrance are well corrected especially, and obtains desirable optical property.
Embodiment three:
Fig. 6 is the structural representation of optical lens assembly embodiment two of the present invention, with reference to Fig. 6, proposes the second embodiment of the present invention, and present embodiment is on the basis of embodiment one, and the correlation parameter that has further proposed lens assembly is following:
Lens parameters:
| Type | Radius-of-curvature (R) | Quadric surface coefficient (k) | Thickness (dmm) |
| First surface | 9.226689 | -78.91152 | 2.87 |
| Second surface | -5.647945 | 13.8713 | 2 |
| The 3rd surface | -7.961955 | 33.04664 | 0.78 |
| The 4th surface | -1.713565 | -1.78347 | 0.1 |
| The optical filter front surface | 0.9 | ||
| Surface behind the optical filter | 2.1 | ||
| Image planes | 0 |
Asphericity coefficient:
First surface (aspheric surface):
a
1：-0.13239387
a
2：0.020306834
a
3：-0.0012555407
a
4：-4.8945981e-005
a
5：3.6343123e-005
a
6：-5.6776908e-006
a
7：4.2806789e-007
a
8：-1.2934519e-008
Second surface (aspheric surface):
a
1：0.077256729
a
2：0.034000851
a
3：0.045795885
a
4：0.022027939
a
5：-0.11722743
a
6：0.14781171
a
7：-0.07995089
a
8：0.017039045
The 3rd surface (aspheric surface):
a
1：0.205314
a
2：0.064978991
a
3：-0.062151404
a
4：0.23670167
a
5：-0.29495838
a
6：0.15408275
a
7：0.043278214
a
8：-0.04376997
The 4th surface (aspheric surface):
a
1：0.05117695
a
2：0.071381312
a
3：-0.24183093
a
4：1.0182805
a
5：-1.7271247
a
6：0.083196504
a
7：3.4308349
a
8：-2.9498988
In the table thickness d for this reason identity distance from next distance, the length overall L=7.77mm of this camera lens, effective focal length value f=2.4mm, the effective focal length value f1=-3.3mm of first lens, the effective focal length value f2=1.92mm of second lens, f-number FNO.=1.8.
In the present embodiment, the material of first lens is refractive index＜1.55, the optical material of dispersion values＞50, and wherein preferred plastic material ZEONEX, refractive index and chromatic dispersion are respectively n2=1.525, v2=56; The material of second lens is refractive index＜1.55, the optical material of dispersion values＞50, and wherein preferred plastic material ZEONEX, refractive index and chromatic dispersion are respectively n2=1.525, v2=56.
Fig. 7 is modulation transfer function (ModulationTransfer Function the is called for short MTF) curve map of the optical lens assembly of the embodiment of the invention three, transverse axis representation space frequency among the figure, and unit: line is to every millimeter (lp/mm); The longitudinal axis is represented the numerical value of modulation transfer function (MTF), and the numerical value of said MTF is used for estimating the image quality of camera lens, and span is 0-1, and the MTF curve is high more representes that more directly the image quality of camera lens is good more, strong more to the reducing power of true picture.As can beappreciated from fig. 2; The MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very near; It shows: this lens assembly is in each visual field; The imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can both blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of can not occurring.
Fig. 8 and Fig. 9 are respectively the curvature of field and the distortion figure of the optical lens assembly of the embodiment of the invention three, can find out from Fig. 8 and Fig. 9, and the curvature of field of this optical lens assembly is less than 0.10mm, and distortion is less than 2%; Can cooperate the requirement of complementary metal oxide semiconductor (CMOS) (CMOS)/CCD (ChargeCoupled Device is called for short CCD) image sensor reception of main flow on the market.
Therefore embodiment provided by the invention can guarantee the effective polymerization to marginal ray under the situation of large aperture diaphragm, is that non-point image difference and aberrance are well corrected especially, and obtains desirable optical property.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. optical lens assembly; Comprise lens combination and fixed aperture; It is characterized in that; Said lens combination comprises first lens and second lens coaxial and that be arranged in order to picture side from object space, and said first lens have towards the protruding aspheric first surface of object space and towards the recessed aspheric second surface of picture side, and second lens have the aspheric the 3rd protruding surperficial protruding aspheric the 4th surface that reaches towards picture side towards object space; First lens have negative diopter, and second lens have positive diopter; Said fixed aperture is positioned at the 4th surface of second lens and goes up the back image space that perhaps is positioned at second lens; Said optical lens assembly meets the following conditions:
L/f＞3.3；f1＜0；f2＞0；
Wherein f is the effective focal length value of whole optical lens assembly; L is the optical system length overall; F1 is the effective focal length value of first lens; F2 is the effective focal length value of second lens.
2. optical lens assembly according to claim 1 is characterized in that also comprise optical filter, said optical filter is positioned at the back image space of second lens; Said optical filter is a glass plate, and the equal plating of the front and rear surfaces of said glass plate has one deck infrared by filter membrane.
3. optical lens assembly according to claim 1 is characterized in that, the face type on said first surface, second surface, the 3rd surface or the 4th surface meets following formula:
Wherein: z is for being starting point with each aspheric surface and optical axes crosspoint, the axial axial value of vertical light, and k is the quadric surface coefficient, c is the minute surface curvature of centre, c=1/R, wherein R is a minute surface curvature of centre radius, r is the minute surface centre-height; a
1, a
2, a
3, a
4, a
5, a
6, a
7, a
8Be asphericity coefficient.
4. optical lens assembly according to claim 1 is characterized in that the material of said first lens is optical plastic or optical glass; Said second lens material is optical plastic or optical glass.
5. like the said optical lens assembly of claim 4, it is characterized in that the material of said first lens and second lens is optical plastic.
6. like the said optical lens assembly of claim 5, it is characterized in that the material of said first lens is refractive index＞1.58, the optical material of dispersion values＜35, the material of second lens are refractive index＜1.55, the optical material of dispersion values＞50.
7. like the said optical lens assembly of claim 6, it is characterized in that the material of said first lens is a polycarbonate, refractive index and chromatic dispersion are respectively n1=1.585, v1=29.9; The material of said second lens is armorphous polyolefin, and refractive index and chromatic dispersion are respectively n1=1.525, v1=56.
8. like the said optical lens assembly of claim 5, it is characterized in that the material of said first lens is refractive index＜1.55, the optical material of dispersion values＞50, the material of said second lens are refractive index＜1.55, the optical material of dispersion values＞50.
9. like the said optical lens assembly of claim 8, it is characterized in that the material of said first lens and second lens is armorphous polyolefin, refractive index and chromatic dispersion are respectively n2=1.525, v2=56.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109070XA CN101986183B (en) | 2009-07-29 | 2009-07-29 | Optical lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109070XA CN101986183B (en) | 2009-07-29 | 2009-07-29 | Optical lens assembly |
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| Publication Number | Publication Date |
|---|---|
| CN101986183A CN101986183A (en) | 2011-03-16 |
| CN101986183B true CN101986183B (en) | 2012-06-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103345045B (en) * | 2013-07-10 | 2015-08-19 | 中山联合光电科技有限公司 | A kind of kind of high image quality miniature Liar of all-plastic lens arrangement |
| EP4127807A1 (en) * | 2020-04-02 | 2023-02-08 | Huawei Technologies Co., Ltd. | Imaging apparatus comprising a wide-angle imaging lens system and a large image sensor |
| CN112904582A (en) * | 2021-02-19 | 2021-06-04 | 南昌欧菲光电技术有限公司 | Optical lens assembly, optical module and equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969883A (en) * | 1998-02-27 | 1999-10-19 | Fuji Photo Optical Co., Ltd. | Imaging lens and optical apparatus using the same |
| JP2000221396A (en) * | 1999-02-02 | 2000-08-11 | Canon Inc | Zoom lens |
| JP2001091830A (en) * | 1999-09-21 | 2001-04-06 | Canon Inc | Zoom lens |
-
2009
- 2009-07-29 CN CN200910109070XA patent/CN101986183B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969883A (en) * | 1998-02-27 | 1999-10-19 | Fuji Photo Optical Co., Ltd. | Imaging lens and optical apparatus using the same |
| JP2000221396A (en) * | 1999-02-02 | 2000-08-11 | Canon Inc | Zoom lens |
| JP2001091830A (en) * | 1999-09-21 | 2001-04-06 | Canon Inc | Zoom lens |
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Effective date of registration: 20200113 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: 518118 Pingshan Road, Pingshan Town, Shenzhen, Guangdong, No. 3001, No. Patentee before: BYD Co.,Ltd. |
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Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. |