CN101963693B - Optical lens assembly - Google Patents

Optical lens assembly Download PDF

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CN101963693B
CN101963693B CN2009101089670A CN200910108967A CN101963693B CN 101963693 B CN101963693 B CN 101963693B CN 2009101089670 A CN2009101089670 A CN 2009101089670A CN 200910108967 A CN200910108967 A CN 200910108967A CN 101963693 B CN101963693 B CN 101963693B
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lens assembly
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refractive index
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CN101963693A (en
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刘海生
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Shenzhen Holitech Optoelectronics Co Ltd
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BYD Co Ltd
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Abstract

The invention relates to the optical field, and provides an optical lens assembly. The optical lens assembly comprises a first lens, a second lens and a third lens which are coaxially and sequentially arrayed from an object space to an image space, wherein the first lens is provided with a convex first surface and a concave second surface, the second lens is provided with a third surface and a fourth surface, and the third lens is provided with a fifth surface and a six surface; all the surfaces are aspheric surfaces; the optical lens assembly satisfies the following conditions that: L/f is more than 1.1 and less than 1.35, f1 is more than 0, the absolute value of f/f1 is more than 0.5 and less than 1.2, f2 is more than 0, the absolute value of f2/f is more than 0.9 and less than 2.2, f3 is less than 0, and the absolute value of f3/f is more than 0.55 and less than 2.2, wherein f and L are effective focal length value and total length of the optical system respectively; and f1, f2 and f3 are effective focal lengths of the first, second and third lenses. The total length of the lens is shortened by adopting the three lenses and the combination of positive, positive and negative diopters; and each aberration is welled corrected so that good optical performance is obtained.

Description

A kind of optical lens assembly
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.Digital product is brought in constant renewal in and is regenerated simultaneously, develops to compact direction day by day, and the optical lens that is provided in the digital image-forming equipment has been had increasingly high requirement.Particularly in camera lens module more than mega pixel and some the miniscanning equipment; In order to guarantee high image quality, brightness and to reach enough field angle; Digital imaging system needs bigger space to come flexion light; Often adopt the method that increases eyeglass quantity and eyeglass material to proofread and correct aberration, improve image quality; This product length does not reach compact requirement far away, has increased the camera lens volume on the one hand, has caused the increase of production cost simultaneously yet.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that overcomes prior art, and a kind of effectively correcting various aberrations is provided, total length, and volume is little, optical lens assembly with low cost.
Technical scheme provided by the invention: a kind of optical lens assembly, comprise lens combination, said lens combination comprises first lens, second lens and the 3rd lens coaxial and that be arranged in order from object space to picture side; First lens have towards the protruding aspheric first surface of object space and towards the recessed aspheric second surface of picture side; Second lens have towards aspheric the 3rd surface of object space and towards aspheric the 4th surface of picture side, and the 3rd lens have the 5th surperficial and towards the 6th surface of picture side towards object space; The 3rd centre of surface is that convex surface, edge are concave surface; The 4th centre of surface is a concave surface, and the edge is smooth plane; The 5th centre of surface is the plane, and the edge is level and smooth arcuation concave surface; The 6th centre of surface is a concave surface, and the edge is level and smooth arcuation convex surface; Said optical lens assembly meets the following conditions:
1.1＜L/f＜1.35；
f1＞0，0.5＜|f/f1|＜1.2；
f2＞0，0.9＜|f/f2|＜2.2；
f3＜0，0.55＜|f/f3|＜2.2；
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; F3 is the effective focal length of the 3rd lens.
The invention has the beneficial effects as follows: technical scheme of the present invention adopts three lens, and six aspheric surfaces designs are just being adopted, positive and negative diopter combinations; Thus, shortened the length overall of camera lens, and to each aberration; Carry out good rectification; Obtained optical property preferably, and be easy to processing, helped cost and reduce.
Description of drawings
The optical assembly structure synoptic diagram of Fig. 1 optical lens assembly embodiment one of the present invention;
Optical lens assembly MTF (optical transfer function) figure of Fig. 2 embodiment two;
The optical lens assembly curvature of field synoptic diagram of Fig. 3 embodiment two;
The optical lens assembly distortion synoptic diagram of Fig. 4 embodiment two;
The optical lens assembly MTF figure of Fig. 5 embodiment three;
The optical lens assembly curvature of field synoptic diagram of Fig. 6 embodiment three;
The optical lens assembly distortion synoptic diagram of Fig. 7 embodiment three.
The specific embodiment mode
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:
Fig. 1 is the optical assembly structure synoptic diagram of optical lens assembly embodiment one of the present invention.
As shown in Figure 1, a kind of optical lens assembly comprises lens combination, and lens combination comprises first lens 1, second lens 2 and the 3rd lens 3 coaxial and that be arranged in order from object space to picture side; First lens 1 have towards the first surface of object space 11 and towards picture side second surface 12; Second lens 2 have towards the 3rd surface 21 of object space and towards the 4th surface 22, the three lens 3 of picture side have towards object space the 5th surperficial 31 and towards the 6th surperficial 32 of picture side; Said first surface 11, second surface 12, the 21, the 4th surface 22, the 3rd surface are aspheric surface; First surface 11 is a convex surface, and second surface 12 is a concave surface; The 3rd surperficial 21 centers are convex surface, and the edge is a concave surface; The 4th surperficial 22 centers are concave surface, and the edge is smooth plane; The 5th surperficial 31 centers are the plane, and the edge is level and smooth arcuation concave surface; The 6th surperficial 32 centers are concave surface, and the edge is level and smooth arcuation convex surface; Said optical lens assembly meets the following conditions:
1.1＜L/f＜1.35；
f1＞0，0.5＜|f/f1|＜1.2；
f2＞0，0.9＜|f/f2|＜2.2；
f3＜0，0.55＜|f/f3|＜2.2；
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; F3 is the effective focal length of the 3rd lens.
Further, optical module of the present invention also comprises fixed aperture 4, and said fixed aperture 4 is positioned on the 6th surface 32 of the 3rd lens 3, perhaps is positioned at the back image space of the 3rd lens 3.Present embodiment preferred immobilization diaphragm 4 is positioned at the back image space of the 3rd lens 3.
Further, optical module of the present invention also comprises optical filter 5, and said optical filter 5 is positioned at the back image space of the 3rd lens 3; Said optical filter 5 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.The preferred optical filter 5 of the present invention is positioned at the back of fixed aperture 4.
Further, the face type on said first surface, second surface, the 3rd surface, the 4th surface, the 5th surface or the 6th surface meets following formula:
z = cr 2 1 + 1 - ( 1 + k ) c 2 r 2 + a 1 r 2 + a 2 r 4 + a 3 r 6 + a 4 r 8 + a 5 r 10 + a 6 r 12
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 6Be asphericity coefficient.
Further, the material of said first lens can also can be optical glass for optical plastic; The material of said second lens can also can be optical glass for optical plastic; Said the 3rd lens material can also can be optical glass for optical plastic.The material of preferred said first lens of present embodiment, second lens and the 3rd lens is optical plastic.
Above-mentioned optical lens assembly, it adopts three lens, and the design of six aspheric surfaces is just being adopted, positive and negative diopter combinations; Thus, shortened the length overall of camera lens, and, carried out good rectification each aberration; Obtained optical property preferably, and be easy to processing, helped cost and reduce.
In addition, fixed aperture is placed on the back of lens combination, can collect more marginal ray, can increase the clear aperature of optical lens assembly of the present invention, needs to increase the raising image quality of lens.To be that the equal plating one deck of sheet glass front and rear surfaces is infrared come from the IR in the object reflection ray by filter coating (IR-cut Coating) with filtering to optical filter, thereby improve image quality.
Embodiment two:
Second embodiment provided by the present invention, on the basis of embodiment one, 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 1.325643 ?0 ?0.25
Second surface 1.060042 ?0 ?0.21
The 3rd surface 7.520604 ?-0.7571741 ?0.47
The 4th surface 0.523487 ?-3.743714 ?0.03
The 5th surface 2.75364 ?-0.325276 ?0.46
The 6th surface 1.253978 ?0 ?0.08
The optical filter front surface ?0.3
Surface behind the optical filter ?0.03
The cover glass front surface ?0.4
Surface behind the cover glass ?0.08
Image planes ?0
Asphericity coefficient:
Type a 1 a 2 a 3 a 4 a 5 a 6
First surface 0.65312957 -1.35697279 27.159753 -673.15972 -596.64185 17984.125
Second surface -0.20089185 -0.08987357 17.6572319 -531.15975 -5123.4896 25364.972
The 3rd surface -0.18457871 3.01257891 35.6157891 -716.75479 5937.5812 -25671.597
The 4th surface -0.045249709 -0.16329857 1.26789156 0.76598214 -2.9511695 -2.8621485
The 5th surface 0.76318972 -0.27982135 22.657835 -1.3257937 -1.3579248 0.1579635
The 6th surface -0.07329458 -0.87156349 1.6792581 -0.7356972 0.3579148 1.2651783
In the table thickness d for this reason identity distance from next distance, the length overall L=2.91mm of this camera lens, effective focal length value f=2.31mm; The effective focal length value f1=2.03mm of first lens, the effective focal length value f2=2.17mm of second lens, the effective focal length value f3=-2.13 of the 3rd lens; F/f1=1.14; F/f2=1.06, f/f3=-0.74, f-number FNO.=2.9.
In the present embodiment, the material of first lens is that < refractive index and chromatic dispersion are respectively n=1.53 to refractive index, v=58 for 1.55, dispersion values>50 optical material, wherein preferred PC (polycarbonate); The material of second lens is refractive index＜1.35, the optical material of dispersion values＜45, and wherein preferred plastic material ZEONEX (armorphous polyolefin), refractive index and chromatic dispersion are respectively n1=1.31, v1=43.5; The material of the 3rd lens is refractive index＞1.57, the optical material of dispersion values＜32, and wherein preferred plastic material PC (polycarbonate), refractive index and chromatic dispersion are divided into n2=1.585, v2=29.5.
Fig. 2 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 (1p/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. 3 and Fig. 4 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. 3 and Fig. 4, 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 (Charge CoupledDevice is called for short CCD) image sensor reception of main flow on the market.
Therefore embodiment provided by the invention can guarantee suitable back focal length on the basis of shortening the camera lens length overall, can also each aberration be that non-point image difference and aberrance are well corrected especially, and obtain desirable optical property.
Embodiment three:
The 3rd embodiment provided by the present invention, on the basis of embodiment one, 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 0.286928 ?-0.9151723 0.44
Second surface 6.060042 ?-109.6843 0.22
The 3rd surface 1.877226 ?0 0.45
The 4th surface 5.569566 ?0 0.03
The 5th surface 2.6513287 ?0 0.43
The 6th surface 0.3987561 ?0 0.06
The optical filter front surface 0.3
Surface behind the optical filter 0.03
The cover glass front surface 0.4
Surface behind the cover glass 0.11
Image planes 0
Asphericity coefficient:
Type a 1 a 2 a 3 a 4 a 5 a 6
First surface 0.53219732 -1.36579152 32.9851234 -597.36984 -6121.3257 16975.175
Second surface -0.31689185 -0.18529928 19.1636572 -493.36582 -4327.1597 27953.159
The 3rd surface -0.23751985 2.63157896 29.3789512 -833.78668 5937.1574 -17956.265
The 4th surface -0.03891565 -0.135698721 1.29358715 0.8123578 -3.1256715 -2.3465872
The 5th surface 0.693196572 -0.19365736 31.6952572 -1.9325157 -1.7563214 0.1798561
The 6th surface -0.067895123 -0.87156349 0.865348715 -0.1365215 0.36794156 1.5632187
In the table thickness d for this reason identity distance from next distance, the length overall L=2.91mm of this camera lens, effective focal length value f=2.31mm; The effective focal length value f1=2.13mm of first lens, the effective focal length value f2=1.97mm of second lens, the effective focal length value f3=-2.07 of the 3rd lens; F/f1=1.08; F/f2=1.17, f/f3=-1.12, f-number FNO.=2.9.
In the present embodiment, the material of first lens is that < refractive index and chromatic dispersion are respectively n=1.53 to refractive index, v=58 for 1.55, dispersion values>50 optical material, wherein preferred PC (polycarbonate); The material of second lens is refractive index＜1.35, the optical material of dispersion values＜45, and wherein preferred plastic material ZEONEX (armorphous polyolefin), refractive index and chromatic dispersion are respectively n1=1.31, v1=43.5; The material of the 3rd lens is refractive index＞1.57, the optical material of dispersion values＜32, and wherein preferred plastic material PC (polycarbonate), refractive index and chromatic dispersion are divided into n2=1.585, v2=29.5.
Fig. 5 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 (1p/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. 5; 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. 6 and Fig. 7 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. 6 and Fig. 7, 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 (Charge CoupledDevice is called for short CCD) image sensor reception of main flow on the market.
Therefore embodiment provided by the invention can guarantee suitable back focal length on the basis that guarantees shortening lens length length overall, can also each aberration be that non-point image difference and aberrance are well corrected especially, and obtain 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 (8)

1. an optical lens assembly comprises lens combination, it is characterized in that, said lens combination comprises first lens, second lens and the 3rd lens coaxial and that be arranged in order from object space to picture side; First lens have towards the protruding aspheric first surface of object space and towards the recessed aspheric second surface of picture side; Second lens have towards aspheric the 3rd surface of object space and towards aspheric the 4th surface of picture side, and the 3rd lens have the 5th surperficial and towards the 6th surface of picture side towards object space; The 3rd centre of surface is that convex surface, edge are concave surface; The 4th centre of surface is a concave surface, and the edge is smooth plane; The 5th centre of surface is the plane, and the edge is level and smooth arcuation concave surface; The 6th centre of surface is a concave surface, and the edge is level and smooth arcuation convex surface; Said optical lens assembly meets the following conditions:
1.1＜L/f＜1.35；
f1＞0，0.5＜|f/f1|＜1.2；
f2＞0，0.9＜|f/f2|＜2.2；
f3＜0，0.55＜|f/f3|＜2.2；
Wherein f is the effective focal length value of whole optical lens assembly; L is the optical lens assembly length overall; F1 is the effective focal length value of first lens; F2 is the effective focal length value of second lens; F3 is the effective focal length of the 3rd lens.
2. optical lens assembly according to claim 1 is characterized in that, also comprises fixed aperture, and the back image space of the 3rd lens is gone up or is positioned on the 6th surface that said fixed aperture is positioned at the 3rd lens.
3. 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 the 3rd 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.
4. optical lens assembly according to claim 1 is characterized in that, the face type on said first surface, second surface, the 3rd surface, the 4th surface, the 5th surface or the 6th surface meets following formula:
Figure F2009101089670C00021
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 6Be asphericity coefficient.
5. optical lens assembly according to claim 1 is characterized in that the material of said first lens can also can be optical glass for optical plastic; The material of said second lens can also can be optical glass for optical plastic; Said the 3rd lens material can also can be optical glass for optical plastic.
6. like the said optical lens assembly of claim 5, it is characterized in that the material of said first lens, second lens and the 3rd lens is optical plastic.
7. like the said optical lens assembly of claim 6; It is characterized in that the material of first lens is refractive index＜1.55, the optical plastic of dispersion values＞50; The material of second lens is refractive index＜1.35; The optical plastic of dispersion values＜45, the material of the 3rd lens are refractive index＞1.57, the optical plastic of dispersion values＜32.
8. like the said optical lens assembly of claim 7, it is characterized in that first lens material is a polycarbonate, refractive index and chromatic dispersion are respectively n1=1.53, v1=58; Second lens material is armorphous polyolefin, and refractive index and chromatic dispersion are respectively n2=1.31, v2=43.5; The 3rd lens material is a polycarbonate, and refractive index and chromatic dispersion are divided into n3=1.585, v3=29.5.
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CN103837966B (en) * 2014-03-04 2016-04-27 中国科学院光电技术研究所 A kind of object lens for i line large-area flat-plate projection mask aligner
CN103837967B (en) * 2014-03-04 2016-05-18 中国科学院光电技术研究所 The i-line projection lens of lithography machine of a kind of large visual field high-NA
KR102663749B1 (en) 2016-02-17 2024-05-08 삼성전자주식회사 Optical lens assembly and apparatus having the same and method of forming an image

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CN2763823Y (en) * 2005-01-07 2006-03-08 鸿富锦精密工业（深圳）有限公司 Composite lens system
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CN101329440A (en) * 2007-06-19 2008-12-24 比亚迪股份有限公司 Optical lens components

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WO1996019749A1 (en) * 1994-12-19 1996-06-27 Benopcon, Inc. Variable power lens systems for producing small images
CN1754110A (en) * 2003-03-04 2006-03-29 纳卢克斯株式会社 Imaging optical system
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
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