CN100429547C - Single-focus lens - Google Patents
Single-focus lens Download PDFInfo
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- CN100429547C CN100429547C CNB200510059018XA CN200510059018A CN100429547C CN 100429547 C CN100429547 C CN 100429547C CN B200510059018X A CNB200510059018X A CN B200510059018XA CN 200510059018 A CN200510059018 A CN 200510059018A CN 100429547 C CN100429547 C CN 100429547C
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Abstract
The present invention relates to an extremely compact single-focus lens of a lens system, which can realize high performance by adopting less lenses and effectively utilizing aspheric surfaces. The single-focus lens is provided with a diaphragm, a first lens (G1) with two aspheric surfaces and a second lens (G2) from an object side in sequence and satisfies conditional expressions (1), (2), wherein the surface of the first lens (G1), which is formed on the object side, is in the shape of a convex positive meniscus, and the convex surface of the secondary battery lens (G2), which is formed in a paraxial mode, is in the shape of a positive meniscus facing the object side; in the conditional expressions 0.20<R1/f<0.70 (1) and 0.05<D2/f1<0.3 (2), f denotes the integral paraxial focal length of the lens system, f1 denotes the paraxial focal length of the first lens (G1), D2 denotes the lens spacing of the first lens (G1) and the secondary battery lens (G2) on an optic axis, and R1 denotes the paraxial curvature radius of the surface of the object side of the first lens (G1).
Description
Technical field
The present invention relates to be suitable for toward for example with the single-focus lens that carries in the portable phone of camera or the PDA small information terminal devices such as (Personal DigitalAssistant).
Background technology
In recent years, be accompanied by personal computer and popularize, the digital still life camera of image information input personal computers such as the landscape taken and bust (below, only be called digital camera) can be popularized rapidly to general family etc.In addition, along with the multifunction of portable phone, the portable phone that carries the band camera of small-sized image pickup module is also popularized rapidly.In addition, carrying photographing module in small-sized Signal Terminal equipment such as PDA also popularizes.
Charge coupled cell) or CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconductor) possess in the equipment of these camera functions, adopted CCD (Charge Coupled Device:.These imaging apparatuss are in recent years to very miniaturization development.Thereby on the picture pick-up device that adopts imaging apparatus such as CCD, for equipment body and carry lens on it, also require miniaturization and.In addition, in recent years, in order to realize high image quality, and the many imaging apparatuss of exploitation pixel, thereupon, also be required the performance of high resolving power more and high-contrast in lens combination.
As the pick-up lens that this picture pick-up device adopted, for example Yi Xia patent documentation 1 is described.Put down in writing the pick-up lens of 2 formations in this patent documentation 1.
Patent documentation 1: the spy opens the 2000-258684 communique
As mentioned above, imaging apparatus in recent years, miniaturization and high pixelation are developed, accompany therewith, particularly require the miniaturization of high resolving power performance and formation in the pick-up lens that digital camera is used.On the other hand, in the pick-up lens that the small information terminal devices such as portable phone of band camera are used, major requirement cost aspect and compactedness in the past, and recently in the portable phone of band camera etc., also trend towards developing the high pixelation of imaging apparatus, for example the above device corresponding with the megabit pixel of 1,000,000 pixels is practical, and be also high with respect to the requirement of aspect of performance.Thereby the diversified lens of taking all factors into consideration cost aspect, aspect of performance and compactedness are developed in expectation.
As the pick-up lens that the small information terminal device corresponding with high pixel used, existing 3 lens combinations that constitute that constitute by 1 glass lens and 2 plastic lenss and the lens combination that adopts 3 above plastic lenss etc. for example developed.But, in order to require correspondingly with in recent years miniaturization, and the expectation lens combination is to be less than 3 block of lense number and in performance direction and existing equal extent.
The described lens of above-mentioned patent documentation, be with 2 constitute and adopt non-ball and lens constitute but the compacter and high performance lens combination of expectation exploitation also.When particularly adopting the small-sized image pickup element, ratio chromatism, is noticeable easily, therefore, can correct ratio chromatism, well as its lens combination expectation.
Summary of the invention
The present invention puts in view of the above problems and produces, and its purpose is to provide a kind of single-focus lens, and it can be by adopting less block of lense number and effectively utilize aspheric surface, thereby realize high-performance and very-close-coupled lens combination.
Single-focus lens of the present invention, from possess successively by object side aperture, two sides be the face of aspherical shape and object side be the 1st lens of meniscus shaped of convex shape and two sides with positive amplification ratio be non-ball and also near paraxial convex surface towards the 2nd lens of the meniscus shaped with positive amplification ratio of object side; And its formation meet the following conditions formula (1), (2):
0.20＜R1/f≤0.355(1)
0.05＜D2/f1≤0.148(2)
Wherein: f represents the paraxial focal length of lens combination integral body, and f1 represents the paraxial focal length of the 1st lens, the lens that D2 represents the 1st lens on the optical axis and the 2nd lens at interval, R1 represents the paraxial radius-of-curvature of face of the object side of the 1st lens.
Single focal lense of the present invention, aperture is configured in by object side, next dispose the 1st lens and the 2nd lens of both-sided aspherical shape successively from object side, and satisfy defined terms formula (1), (2) of the focal length relate to the 1st lens and shape etc., shape, the magnification of each lens are distributed suitably, thereby adopt 2 so few block of lense numbers and effectively utilize aspheric surface, and can obtain and the existing equal high optical property of lens that is used for general 3 formations of the portable phone of camera etc.In addition, can also realize than existing very-close-coupled lens combination.
Here, this single focal lense, preferably it constitutes the formula (3) that also meets the following conditions.Owing to satisfy these conditions, thereby be particularly conducive to the rectification of ratio chromatism.
0.70＜ΔZF/ΔZR≤0.859(3)
And Δ ZF represents the shape displacement at the optical axis direction at maximum effective sunlight height H F place of face of the object side of the 1st lens, and Δ ZR represents the shape displacement at the optical axis direction at maximum effective sunlight height H R place of face of the picture side of the 1st lens.
In addition, in this single focal lense, the lens material of the 1st lens and the 2nd lens preferably is plastic material.Owing to adopt plastic material thereby carry out aspherical mirror machining easily.
Can suitably adopt these preferably to constitute according to necessity, thereby realize more high-performance and compact lens combination.
According to single-focus lens of the present invention, aperture is configured in by object side, next dispose the 1st lens and the 2nd lens of both-sided aspherical shape successively from object side, and satisfy defined terms formula (1), (2) of the focal length relate to the 1st lens and shape etc., make shape, the magnification of each lens distribute optimization, therefore adopt less block of lense number and effectively utilize aspheric surface, thereby can realize high-performance and very-close-coupled lens combination.
Particularly satisfy condition formula (3) and when constituting, can make the rectification of ratio chromatism, easier, thereby can realize more high-performance and small-sized lens combination in the shape that makes the 1st lens.
Description of drawings
Fig. 1 represents lens cut-open view configuration example, corresponding with embodiment 1 of the single-focus lens of one embodiment of the present invention.
Fig. 2 represents the lens cut-open view other configuration examples, corresponding with embodiment 2 of the single-focus lens of one embodiment of the present invention.
Fig. 3 is the key diagram about the 1st lens shape of the single-focus lens of one embodiment of the present invention.
Fig. 4 is the aberration diagram of spherical aberration, astigmatism, optical distortion and ratio chromatism, of the single-focus lens of expression embodiment 1.
Fig. 5 is the aberration diagram of spherical aberration, astigmatism, optical distortion and ratio chromatism, of the single-focus lens of expression embodiment 2.
Among the figure, the CG-cloche; The St-aperture; Gj-begins the j lens from object side; Ri-begins the radius-of-curvature of i lens face from object side; Di-from object side begin i number and the face of i+1 lens face at interval; The Z1-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.
Fig. 1 represents a configuration example of the single-focus lens of one embodiment of the present invention.This configuration example constitutes corresponding with the lens of the 1st numerical value embodiment (table 1, table 2) described later.In addition, Fig. 2 represents a configuration example of the single-focus lens of present embodiment.The configuration example of Fig. 2 constitutes corresponding with the lens of the 2nd numerical value embodiment (table 3, table 4) described later.Also have, among Fig. 1, Fig. 2, symbol Ri, expression with aperture St as No. 0, with by the face of the inscape of object side as No. 1, along with to the radius-of-curvature of as side (imaging side) increases successively, giving i (i=0～6) face of symbol.Symbol Di represent on the optical axis Z1 of i face and i+1 face face at interval.Also have, its basic comprising of each configuration example is all identical, so below, describe with constituting substantially of single-focus lens shown in Figure 1.
This single-focus lens carries for example with small information terminal device such as the portable phone of camera and digital camera etc., particularly adopt in the picture pick-up device of small-sized image pickup element and use.This single-focus lens, its formation are from dispose aperture St, the 1st lens G1 and the 2nd lens G2 successively by object side along optical axis Z1.
Go up configuration at the imaging surface (shooting face) of this single-focus lens and do not have imaging apparatuss such as illustrated CCD.Near the shooting face of CCD, configuration is in order to the cloche CG of protection shooting face.Between the 2nd lens and the imaging surface (shooting face), except that cloche CG, can also dispose other opticses such as infrared ray cut off filter and low-pass filter.
The 1st lens G1, the two sides is an aspherical shape, and forms that to make the face of object side be the meniscus shaped with positive amplification ratio of convex shape.
The 2nd lens G2, the two sides is an aspherical shape, and forms near paraxial convex surface towards the meniscus shaped with positive amplification ratio of object side.The aspherical shape of the 2nd lens G2, hope are for example in the effective diameter scope, rely on the weak more aspherical shape of periphery, negative magnification more as the face of side.Thereby the 2nd lens G2 is convex shape for concave at periphery as the face of side near paraxial for example.
Also have, in the present embodiment, near paraxial lens shape (removes coefficient A by for example part of the middle COEFFICIENT K of aspheric surface formula described later (A)
iPolynomial segment beyond part) expression.
This single-focus lens, its formation meet the following conditions formula (1), (2).In conditional (1), (2), f represents the paraxial focal length of lens combination integral body, f1 represents the paraxial focal length of the 1st lens G1, the lens that D2 represents the 1st lens G1 on the optical axis and the 2nd lens G2 at interval, R1 represents the paraxial radius-of-curvature of face of the object side of the 1st lens G1.
0.20＜R1/f＜0.70(1)
0.05＜D2/f1＜0.3(2)
This single focal lense, preferably it constitutes the formula (3) that also meets the following conditions.
0.70＜ΔZF/ΔZR＜1.20(3)
Here, Δ ZF as shown in Figure 3, represents the shape displacement at the optical axis direction at height H F place of face of the object side of the 1st lens G1, and Δ ZR represents the shape displacement at the optical axis direction at height H R place of face of the picture side of the 1st lens G1.Height H F is in the face of the object side of the 1st lens G1 maximum height by effective sunlight, and height H R is in the face of the picture side of the 1st lens G1 maximum height by effective sunlight.
This single-focus lens, the two sides of the 1st lens G1 and the 2nd lens G2 is an aspherical shape, therefore aspect processability, wishes that the lens material of the 1st lens G1 and the 2nd lens G2 is plastic material.
Below, about as the effect and the effect of the single-focus lens of above formation describe.
This single-focus lens, aperture St is configured in by object side, next dispose the 1st lens G1 and the 2nd lens G2 of both-sided aspherical shape successively from object side, and satisfy defined terms formula (1), (2) of the focal length relate to the 1st lens G1 and shape etc., shape, the magnification of each lens are distributed suitably, therefore adopt 2 so few block of lense numbers and effectively utilize aspheric surface, thereby also can realize the lens combination of high-performance and utmost point compact.The formula (3) owing to also meet the following conditions, thereby can realize more high-performance.
The effect of each conditional as below.Conditional (1) is about the radius-of-curvature of the face of the object side of the 1st lens G1, if break away from this numerical range, then particularly is difficult to carry out the rectification of frame aberration and ratio chromatism,, therefore not as preferred.Conditional (2) is about the paraxial focal distance f 1 of the lens interval D 2 of the 1st lens G1 on the optical axis and the 2nd lens G2 and the 1st lens G1, if break away from this numerical range, then is difficult to suppress total length and guarantee the emergent pupil distance, therefore not as preferred.Conditional (3) if break away from this numerical range, then is difficult to carry out the rectification of ratio chromatism,, therefore not as preferred about the face shape of the 1st lens G1.
So, according to the single-focus lens of present embodiment, by adopting 2 so few block of lense numbers and effectively utilize aspheric surface, thereby can obtain and the existing equal high optical property of lens that is used to general 3 formations of the portable phone of camera etc.In addition, can also realize than existing very-close-coupled lens combination.
[embodiment]
Below, describe about the concrete numerical value embodiment of the single-focus lens of present embodiment.Below, the 1st and the 2nd numerical value embodiment (embodiment 1,2) is carried out general description.Table 1, table 2 are represented the corresponding concrete lens data of formation (embodiment 1) with single-focus lens shown in Figure 1.Also have, table 3, table 4 are represented the corresponding concrete lens data of formation (embodiment 2) with single-focus lens shown in Figure 2.Master data part in the lens data of table 1 and table 3 expression embodiment, table 2 and table 4 expression are about the data division of aspherical shape in the lens data of embodiment.
[table 1]
(*: aspheric surface) (f=3.88mm, FN0.=4.0,2 ω=62.8 °)
[table 2]
[table 3]
(*: aspheric surface) (f=3.86mm, FN0.=4.0,2 ω=62.4 °)
[table 4]
The face number Si hurdle of the lens data shown in each table, single-focus lens about each embodiment, expression with aperture St as No. 0, with by the face of the lens key element of object side as No. 1, along with to the face of i (i=0～6) face of as side (imaging side) increases successively, giving symbol number.Radius of curvature R i hurdle, corresponding with the symbol Ri that gives among Fig. 1, Fig. 2, the value of the radius-of-curvature of the i face that expression begins from object side.About face interval D i hurdle, corresponding with the symbol of giving among Fig. 1, Fig. 2, the interval on i face Si that expression begins from object side and the optical axis of i+1 face Si+1.The unit of the value of radius of curvature R i and face interval D i is a millimeter (mm).J (j=1～3) the lens key element that Ndj, vdj hurdle represent to comprise cloche CG respectively, begin from object side with respect to the refractive index of d line (587.6nm) and the value of Abbe number.Also have, the radius of curvature R 5 on the two sides of cloche CG, the value of R6 are 0 (zero), and this is expressed as the plane.In addition, the value of the radius of curvature R 0 of aperture St is 0 (zero), and this is expressed as imaginary plane.
In table 1 and the table 3,, also represent paraxial focal distance f (mm), F number (FNO.), the field angle 2 ω (ω: value angle of half field-of view) of total system simultaneously as all data.Also have, the single-focus lens of each embodiment has the performance of focal distance f=35mm when being equivalent to shooting face represented with the conversion of 35mm film.
Each lens data of table 1 and table 3 is attached to the mark " * " in face number left side, represents that its lens face is an aspherical shape.Each embodiment all is that two sides S1, the S2 of the 1st lens G1 and two sides S3, the S4 of the 2nd lens G2 form aspherical shape.In the basic lens data, as these aspheric radius-of-curvature, near near the numerical value of the radius-of-curvature of (paraxial) the expression optical axis.
The numerical value that the numerical value of each aspherical surface data of table 2 and table 4, mark " E " expression are connected on it under is the end " power exponent " with 10, represents that it is that the preceding numerical value of the represented numerical value of the exponential function at the end and " E " multiplies each other with 10.For example " if 1.0E-02 ", then expression " 1.0 * 10
-2".
Each aspherical surface data is write down by the value with each coefficient Ai, K of the formula of the aspherical shape of following formula (A) expression.In more detail, Z represents that point on the aspheric surface of the high h of distance optical axis position is down to the length (mm) of the vertical line that connects plane (plane vertical with optical axis) on aspheric surface summit.
Z＝C·h
2/{1+(1-K·C
2·h
2)
1/2}+A
3·h
3+A
4·h
4+A
5·h
5+A
6·h
6+A
7·h
7+A
8·h
8+A
9·h
9+A
10·h
10+A
11·h
11(A)
Wherein:
Z: the aspheric degree of depth (mm)
H: the distance from the optical axis to the lens face (highly) (mm)
K: eccentricity
C: paraxial curvature=1/R (R: paraxial radius-of-curvature)
Ai: the asphericity coefficient of the i time (i=3～11)
Each embodiment all is: the two sides S1 of the 1st lens G1, the aspherical shape of S2, as asphericity coefficient, not only effectively utilize the inferior A of even number
4, A
6, A
8, A
10Expression also effectively utilizes the inferior A of odd number
3, A
7, A
9, A
11Expression.In addition, the two sides S3 of the 2nd lens G2, the aspherical shape of S4 as asphericity coefficient, are not only effectively utilized the inferior A of even number
4, A
6, A
8, A
10Expression also effectively utilizes the inferior A of odd number
3, A
7, A
9Expression.
In addition, in the following table 5,, summarize expression about each embodiment to the value that above-mentioned conditional (1)～(3) relate to.As shown in table 5, the value of each embodiment is in the numerical range of each conditional (1)～(3).
[table 5]
Spherical aberration, astigmatism, optical distortion (distortion aberration) and the ratio chromatism, of the single-focus lens of Fig. 4 (A)～(D) expression embodiment 1.Each aberration diagram, expression is the aberration of reference wavelength with the d line, and spherical aberration diagram and ratio chromatism, figure also represent the aberration about g line (wavelength 435.8nm), C line (wavelength 656.3nm).Among the astigmatism figure, solid line is represented radially the aberration of (sagittal), the aberration that dotted line is represented tangential direction.ω represents angle of half field-of view.Equally, about all aberrations of embodiment 2 shown in Fig. 5 (A)～(D).
As indicated in each above numeric data and each aberration diagram,, adopt less block of lense number can realize correcting well aberration, very-close-coupled lens combination about each embodiment.
Also have, the present invention is not limited to the respective embodiments described above and each embodiment, can carry out various distortion.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. are not limited to the value shown in above-mentioned each numerical value embodiment, also can get other values.
Claims (3)
1. single-focus lens is characterized in that: from possess successively by object side aperture, two sides be the face of aspherical shape and object side be the 1st lens of meniscus shaped of convex shape and two sides with positive amplification ratio be the aspheric surface shape and near paraxial convex surface towards the 2nd lens of the meniscus shaped with positive amplification ratio of object side;
And, its formation meet the following conditions formula (1), (2),
0.20＜R1/f≤0.355 (1)
0.05＜D2/f1≤0.148 (2)
Wherein: f be the paraxial focal length of lens combination integral body, paraxial focal length, D2 that f1 is the 1st lens be the 1st lens on the optical axis and the 2nd lens lens at interval, R1 is the paraxial radius-of-curvature of face of the object side of the 1st lens.
2. single-focus lens according to claim 1 is characterized in that: it constitutes the formula (3) that also meets the following conditions,
0.70＜ΔZF/ΔZR≤0.859 (3)
Wherein: Δ ZF is the shape displacement of the optical axis direction of locating at maximum effective sunlight height (HR) of face of shape displacement, picture side that Δ ZR is the 1st lens of the optical axis direction of locating at maximum effective sunlight height (HF) of face of the object side of the 1st lens.
3. single-focus lens according to claim 1 and 2 is characterized in that: the lens material of above-mentioned the 1st lens and above-mentioned the 2nd lens is plastic material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510059018XA CN100429547C (en) | 2005-03-24 | 2005-03-24 | Single-focus lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510059018XA CN100429547C (en) | 2005-03-24 | 2005-03-24 | Single-focus lens |
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| CN1837884A CN1837884A (en) | 2006-09-27 |
| CN100429547C true CN100429547C (en) | 2008-10-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101206299B (en) * | 2006-12-21 | 2011-07-27 | 比亚迪股份有限公司 | Optical lens component |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5739965A (en) * | 1995-05-31 | 1998-04-14 | Fuji Photo Optical Co., Ltd. | Wide angle lens system for camera |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
-
2005
- 2005-03-24 CN CNB200510059018XA patent/CN100429547C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5739965A (en) * | 1995-05-31 | 1998-04-14 | Fuji Photo Optical Co., Ltd. | Wide angle lens system for camera |
| CN1515950A (en) * | 2002-10-28 | 2004-07-28 | ���Ῠ���ܴ�ع���ʽ���� | Photographic lens, photographic unit and portable terminal |
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