CN100394241C - Imaging lens - Google Patents

Imaging lens Download PDF

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CN100394241C
CN100394241C CNB2006100737899A CN200610073789A CN100394241C CN 100394241 C CN100394241 C CN 100394241C CN B2006100737899 A CNB2006100737899 A CN B2006100737899A CN 200610073789 A CN200610073789 A CN 200610073789A CN 100394241 C CN100394241 C CN 100394241C
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lens
mentioned
imaging lens
lens system
imaging
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CN1847907A (en
Inventor
筱原义和
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Tianjin OFilm Opto Electronics Co Ltd
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Fujinon Corp
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Abstract

The invention discloses a pick-up lens, which comprises the following parts: first lens, negative second lens, third lens with image side out of optical shaft position and forth lens with two non-spherical lens, wherein the condition formula satisfies R<SUB>3R</SUB>>R<SUB>4F</SUB>>0 (1) and PH<SUB>3R</SUB>>PH<SUB>4F</SUB>, wherein the R<SUB>3R</SUB> is center curvature radius of image lateral of third lens; the R<SUB>4F</SUB> is center curvature radius of image lateral of forth lens; the PH<SUB>3R</SUB> is height of polar point from optical shaft of image surface of third lens; the PH<SUB>4F</SUB> is height from optical shaft of polar point of object lateral of forth lens.

Description

Imaging lens system
Technical field
The present invention relates to a kind of imaging lens system of densification of four chip architectures, relate in particular to the imaging lens system that the seizure image that is applicable to PC or portable terminal etc. is used lens.
Background technology
In the past, as the picture catching lens subassembly of the more slim machine that is installed on digital camera, PC Web video camera, portable terminal etc., that knows had, in three chip architectures of the most close picture side configuration optical aberration correcting with non-spherical lens.
But, well-known, recently, be installed on the imaging apparatus of the CCD etc. of above-mentioned portable terminal etc., develop high pixelation rapidly, so can be tackled four lens arrangements of this problem by known useful lens subassembly.
For example, in the imaging lens system of in following patent documentation 1,2, being put down in writing, be that thus, can obtain can be corresponding to the optical property of the imaging apparatus of high pixel in four chip architectures of two optical aberration correctings of picture side configuration with non-spherical lenses.
The open 2004-102234 communique of [patent documentation 1] Jap.P.
The open 2005-24889 communique of [patent documentation 2] Jap.P.
But in above-mentioned portable terminal, further the requirement of slimming is more and more stronger, and as the imaging lens system that is used in portable terminal etc., also requires to shorten significantly its total length.But the imaging lens system of being put down in writing in the above-mentioned patent documentation 1,2 does not satisfy such requirement.
Summary of the invention
The present invention makes in view of the above problems, its purpose is, provide a kind of and shorten the structure of total lengths by four lens, simultaneously, make with the optical property headed by curvature of the image or the chromatic aberation can be well suited imaging lens system more than the level of imaging apparatus in recent years.
In order to achieve the above object, imaging lens system of the present invention, it is characterized in that: the face of second lens that object side is arranged in order first lens that are made of positive lens, be made of negative lens, the 3rd lens that constitute at the both-sided aspherical lens that have limit on the position beyond the optical axis position as the face of side and object side has the 4th lens that the both-sided aspherical lens of limit constitute on the position beyond the optical axis position, and, the formula that meets the following conditions (1), (2)
R 3R＞R 4F＞0 (1)
PH 3R＞PH 4F (2)
γ d2＜35 (3)
Wherein,
R 3R: the curvature of centre radius of the picture side of above-mentioned the 3rd lens
R 4F: the curvature of centre radius of the object side of above-mentioned the 4th lens
PH 3R: the above-mentioned limit of the face of the picture side of above-mentioned the 3rd lens is apart from the distance of optical axis
PH 4F: the above-mentioned limit of the face of the object side of above-mentioned the 4th lens is apart from the distance of optical axis
γ D2: the Abbe number of above-mentioned second lens.
And so-called above-mentioned " limit " is meant in the position on the radius from the optical axis extending to the peripheral direction, its limit that exists later of the limit of optical axis.In addition, in this manual, under the situation of definition lens shape, represent near the shape that optical axis is in principle.
In addition, in this case, preferred satisfied following conditional (3).
γ d2＜35 (3)
Wherein,
γ D2: the Abbe number of above-mentioned second lens.
And then preferably, described second lens are the meniscus shaped lens of concave surface towards object side.
At this, at least one in the formula that meets the following conditions (4)～(6) is advisable,
0＜R 4F＜R 4R (4)
0＜R 4F/F＜0.5 (5)
γ d1＞65 (6)
Wherein,
R 4R: the curvature of centre radius of the picture side of above-mentioned the 4th lens
F: the focal length of whole lens combination
γ D1: the Abbe number of above-mentioned first lens.
And, between above-mentioned first lens and above-mentioned second lens, disposing aperture, the formula that meets the following conditions (7) is advisable,
D A1-2＞D T1 (7)
Wherein,
D A1-2: the axle between above-mentioned first lens and above-mentioned second lens is gone up the airspace
D T1: the axle of above-mentioned first lens is gone up thickness.
(effect of invention)
According to imaging lens system of the present invention, give first lens main imaging function, the 3rd lens and the 4th lens by both-sided aspherical have the optical aberration correcting function.
And, constitute the curvature of centre radius R of the picture side of the 3rd lens 3RThe curvature of centre radius R of the object side of ratio the 4th lens 4FGreatly, simultaneously, the limit of the picture side of the 3rd lens is apart from distance (highly) PH of optical axis 3RThe limit of the object side of ratio the 4th lens is apart from distance (highly) PH of optical axis 4FGreatly.Promptly, in the air lens between the 3rd lens and the 4th lens, constitute, little as the curvature of centre radius of the curvature of centre radius ratio object side of side, lower as the height and position of the aspheric surface limit of side than the height and position of the aspheric surface limit of object side.If constitute two air lens between the non-spherical lens like this, even shorten the total length of lens combination significantly, also can keep the optical aberration correcting function of the 3rd lens and the 4th lens well, especially can guarantee the formedness of curvature of the image.
And, according to imaging lens system of the present invention, use the high dispersive material at second lens, thereby can compensate the deterioration that is made as four chromatic aberations that cause because of the lens number, and become good chromatic aberation.
Description of drawings
Fig. 1 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 1;
Fig. 2 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 1;
Fig. 3 is the chart of shape data of air lens of the imaging lens system of expression embodiment 1;
Fig. 4 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 2;
Fig. 5 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 2;
Fig. 6 is the chart of shape data of air lens of the imaging lens system of expression embodiment 2;
Fig. 7 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 3;
Fig. 8 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 3;
Fig. 9 is the chart of shape data of air lens of the imaging lens system of expression embodiment 3;
Figure 10 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 4;
Figure 11 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 4;
Figure 12 is the chart of shape data of air lens of the imaging lens system of expression embodiment 4;
Figure 13 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 5;
Figure 14 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 5;
Figure 15 is the chart of shape data of air lens of the imaging lens system of expression embodiment 5;
Figure 16 is the skeleton diagram of structure of the imaging lens system of the expression embodiment of the invention 6;
Figure 17 is the aberration diagram of each aberration (spherical aberration, astigmatism and distortion) of the imaging lens system of expression embodiment 6;
Figure 18 is the chart of shape data of air lens of the imaging lens system of expression embodiment 6.
Among the figure, L 1～L 4-lens, X-optical axis, P-image space, 1-cover glass, 2-aperture, 3-imaging apparatus (shooting face).
Embodiment
Below, with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.Also have, in following record, the power of each related lens or the concaveconvex shape of each lens face are represented the state on the optical axis in principle.The imaging lens system of embodiment as shown in Figure 1 (is that representative is represented with embodiment 1), be arranged in order the following stated lens from object side, make the image space P that focuses on imaging apparatus (shooting face) 3 along the light beam of optical axis X incident effectively, that is: the first lens L that constitutes by positive lens 1, the second lens L that constitutes by negative lens 2, on the position beyond the optical axis position, have the 3rd lens L that the both-sided aspherical lens of limit constitute as the face of side 3, and the face of object side on the position beyond the optical axis position, have the 4th lens L that the both-sided aspherical lens of limit constitute 4And, at the first lens L 1Object side dispose aperture 2, between imaging lens system and imaging apparatus 3, dispose cover glass 1.Also has above-mentioned the 3rd lens L 3Be positive meniscus shaped lens in each of the embodiments described below.In addition, above-mentioned the 4th lens L 4Be positive meniscus shaped lens in each of the embodiments described below, but can also be the negative meniscus lens.And then, more preferably, the above-mentioned second lens L 2Be the meniscus shaped lens of concave surface towards object side.
And the aspherical shape of each lens face is by following aspheric surface formulate.
[mathematical formulae 1]
Z = Y 2 / R 1 + 1 - K &times; Y 2 / R 2 + &Sigma; i = 3 10 A i Y i
Wherein,
Z: the length of the vertical line on the section from the point on the aspheric surface of distance optical axis distance Y to the aspheric surface summit (perpendicular to the plane of optical axis)
Y: from the distance of optical axis
Near R: the radius-of-curvature the aspheric optical axis
K: eccentricity
A i: asphericity coefficient (i=3～10)
Below, the action effect of present embodiment is described.
In four lens, by increasing the first lens L 1Positive, length that can reducing glass integral body.
And, the 3rd lens L 3And the 4th lens L 4, all be the lens of both-sided aspherical, by two lens with this kind optical aberration correcting function are set, can do each aberration headed by curvature of the image or the spherical aberration well.
And, the imaging lens system of present embodiment, the formula that meets the following conditions (1)～(2).
R 3R＞R 4F＞0 (1)
PH 3R＞PH 4F (2)
Wherein,
R 3R: the curvature of centre radius of the picture side of above-mentioned the 3rd lens
R 4F: the curvature of centre radius of the object side of above-mentioned the 4th lens
PH 3R: the above-mentioned limit of the face of the picture side of above-mentioned the 3rd lens is apart from the distance (highly) of optical axis
PH 4F: the above-mentioned limit of the face of the object side of above-mentioned the 4th lens is apart from the distance (highly) of optical axis.
Above-mentioned conditional (1) is illustrated in and is positioned at the 3rd lens L 3And the 4th lens L 4Between the air lens in, as the curvature of centre radius of the face of side curvature of centre semiconductor less than the face of object side.By satisfying this conditional (1),, also can keep the especially formedness of curvature of the image even shorten the total length of lens combination significantly.That is, when not satisfying this conditional (1),, then be difficult to the bending of the tangential image planes of revisal if will shorten the total length of lens combination.
And above-mentioned conditional (2) is illustrated in and is positioned at the 3rd lens L 3And the 4th lens L 4Between the air lens in, lower as the height and position of the aspheric surface limit of side than the height and position of the aspheric surface limit of object side.By satisfying this conditional (2),, also can keep the especially formedness of the tangential curvature of the image of outer peripheral portion even shorten the total length of lens combination significantly.That is, when not satisfying this conditional (2),, then be difficult to the revisal curvature of the image if will shorten the total length of lens combination.
And then, in the imaging lens system of present embodiment, preferably, the formula that meets the following conditions (3).
γ d2＜35 (3)
Wherein,
γ D2: the Abbe number of above-mentioned second lens.
By satisfying above-mentioned conditional (3), can reduce chromatic aberation.That is, if surpass the upper limit of this conditional (3), then axle is gone up the chromatic aberation change greatly, causes exploring power to descend.
And in the imaging lens system of present embodiment, at least one in the formula that meets the following conditions (4)～(6) is advisable.
0＜R 4F＜R 4R (4)
0＜R 4F/F＜0.5 (5)
γ d1＞65 (6)
Wherein,
R 4R: the curvature of centre radius of the picture side of above-mentioned the 4th lens
F: the focal length of whole lens combination
γ D1: the Abbe number of above-mentioned first lens
Above-mentioned conditional (4) expression is at the 4th lens L 4In the curvature of centre radius on two sides, further reduce the curvature of centre radius R of picture side 4R, by satisfying this conditional (4), revisal curvature of the image and shorten total length well.That is, when not satisfying this conditional (4), be difficult to shorten total length.
And above-mentioned conditional (5) expression removes the 4th lens L with the focal length of total system 4The value of curvature of centre radius of object side less than 0.5, if satisfy above-mentioned conditional (5), can guarantee the optical aberration correcting function and further increase the power of the 4th lens, and can further shorten the total length of lens combination.
And above-mentioned conditional (6) expression is by than the first lens L 1The big glass material of Abbe number form.In conditional (1), because definition is with the second lens L 2Form by the high dispersive glass material, therefore, if by satisfying this conditional (6) with the first lens L 1Form by the low glass material that disperses, can reduce a last chromatic aberation, thereby, exploring power improved.
And, in the imaging lens system of present embodiment, meet the following conditions and more be advisable.
That is, at the above-mentioned first lens L 1And the above-mentioned second lens L 2Between configuration aperture 2, the formula that meets the following conditions (7) be advisable (in embodiment 3 described later adopt).
D A1-2＞D T1 (7)
Wherein,
D A1-2: the axle between above-mentioned first lens and above-mentioned second lens is gone up the airspace
D T1: the axle of above-mentioned first lens is gone up thickness
By satisfying such condition, as the first lens L 1With the second lens L 2Between axle go up airspace, the sufficient space that can guarantee to be used to dispose aperture device.That is,, be difficult to the sufficient space of guaranteeing to open and close aperture 2 or inserting the light quantity changeable mechanism if do not satisfy this conditional (7).
And the imaging lens system of present embodiment is positioned at the 3rd lens L 3With the 4th lens L 4Between the two sides of air lens become the shape of coincideing mutually, the symbol of curvature of centre radius is also just all becoming (protruding to the object side direction).So, in the present embodiment, be conceived to be positioned at the 3rd lens L 3With the 4th lens L 4Between the aspherical shape on two sides of air lens, realize based on the following stated fact of finding, that is: because as the magnitude relationship of these two aspheric curvature of centre radiuses of above-mentioned definition and the height and position relation of limit, even the total length of lens combination shortened to three lens arrangements compares also not inferior degree, also can keep curvature of the image well.
And,, can carry out the change of multiple mode as imaging lens system of the present invention.Modification is as, the radius-of-curvature of each lens aptly, and lens are (or lens thickness) and aspheric shape at interval.And, as lens material, be not limited to glass material, constitute by using the plastics material, can reduce cost.Also have, aspheric surface is formed at the 3rd lens L at least 3And the 4th lens L 4The two sides, and preferably also be formed at the first lens L 1And the second lens L 2So,, on a plurality of, carry out optical aberration correcting by aspheric surface being distributed in each lens face, thereby, optical property can be improved.
[embodiment]
(embodiment 1)
Fig. 1 represents the schematic configuration of the imaging lens system of embodiment 1.This imaging lens system comprises: the first lens L that is made of the positive meniscus shaped lens that makes convex surface towards object side 1By the second lens L that concave surface is constituted towards the negative meniscus lens as side 2Near the 3rd lens L that has the aspheric positive meniscus shaped lens formation of limit beyond the two sides has optical axis 3And the 4th lens L 4And, the first lens L 1With the second lens L 2The two sides also be all aspheric surface.
Table 1 expression, the center thickness of the radius of curvature R of each lens face of this imaging lens system (mm), each lens and the airspace between each lens (below, these are referred to as above the axle at interval) D (mm), each lens are in the value of refractive index N on the d line and the Abbe number γ on the d line.And, the order that the numeral in the table begins from object side (first is the aperture face, and the 12 is shooting face).And expression is aspheric about each, at aspheric each constant K, the A shown in the above-mentioned aspheric surface formula in the table 2 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, the focal distance f of the whole lens combination in embodiment 1 is set at 1.0mm.
[table 1]
Face R D N dv d
STO 1 ∞ 0.00000
*2 0.3559 0.20958 1.468250 78.0
*3 6.2432 0.16540
*4 -0.3413 0.13055 1.602929 28.0
*5 -0.8857 0.01741
*6 0.5895 0.15644 1.508692 56.0
*7 0.6129 0.04784
*8 0.2826 0.14850 1.508692 56.0
*9 0.3040 0.12184
10 ∞ 0.06962 1.516330 64.1
11 ∞ 0.12094
IMG 12 ∞
* aspheric surface
[table 2]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
2 7.233×10 -1 -4.976×10 -2 1.023 -1.037×10 1.018×10 1.220×10 2 1.970×10 2 -1.500×10 3 -1.700×10 4
3 1.000 -1.716×10 -1 -1.290 -1.259×10 -3.078×10 2.356×10 2 1.102×10 2 -1.766×10 4 2.499×10 4
4 1.640 -1.312 9.231×10 -2 3.928×10 -1.455×10 2 -8.684×10 2 2.401×10 3 3.611×10 4 -1.750×10 5
5 -2.632 -2.346 -1.844×10 1.090×10 2 2.804×10 -6.861×10 2 -8.552×10 2 5.757×10 3 2.847×10 2
6 -2.533×10 -2.029 6.589 2.914 -2.831×10 -2.024×10 2 2.090×10 2 2.525×10 3 -5.427×10 3
7 5.928×10 -1 -3.573×10 -1 -6.054 -1.781×10 -1 2.027×10 -5.687×10 4.009×10 1.784×10 2 -4.734×10 2
8 -6.293 1.211 -5.793 -1.580×10 5.763 4.983×10 1.894×10 -3.690×10 -1.782×10
9 -3.869 4.703×10 -1 -7.319 1.038×10 -1.746×10 -1.339×10 7.094×10 9.825×10 -2.293×10 2
And, as shown in table 13 according to the imaging lens system of embodiment 1, the formula that all satisfies condition (1)～(6).And the total length of lens combination is set to 1.19mm.
Fig. 2 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 1, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 1, and each aberration of revisal well.
And among the embodiment 1, Fig. 3 represents, to the 3rd lens L 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
(embodiment 2)
Fig. 4 represents the schematic configuration of the imaging lens system of embodiment 2.The structure of this imaging lens system and embodiment 1 are roughly the same, in the drawing explanation of correspondence, about the additional same-sign of identical key element, omit the explanation of its repetition.In this imaging lens system, at the second lens L 2～the four lens L 4The lens face of each lens be formed with aspheric surface.The top interval D (mm) of the axle of the radius of curvature R (mm) of each lens face of this imaging lens system of expression, each lens, each lens reach the value of the Abbe number γ on the d line in the table 3 at the refractive index N on the d line.And, the order that the numeral in the table begins from object side (first is the aperture face, and the 12 is shooting face).And expression in the table 4 is about each aspheric surface, at aspheric each constant K, the A shown in the above-mentioned aspheric surface formula 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, the focal distance f of the whole lens combination in embodiment 2 is set at 1.0mm.
[table 3]
Face R D N dv d
STO 1 ∞ 0.00000
2 0.4090 0.23985 1.496999 80.0
3 3.8957 0.14642
*4 -0.4250 0.12883 1.602929 28.0
*5 -0.9853 0.01718
*6 0.6749 0.18062 1.508692 56.0
*7 0.6680 0.06954
*8 0.2611 0.15696 1.508692 56.0
*9 0.2666 0.12024
10 ∞ 0.06871 1.516330 64.1
11 ∞ 0.12299
IMG 12 ∞
* aspheric surface
[table 4]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
4 1.140 -3.205×10 -1 2.248 2.660×10 1.203×10 2 -1.500×10 3 -2.812×10 3 4.838×10 4 -1.000×10 5
5 4.831 1.106 -1.941×10 1.141×10 2 -1.068×10 2 -7.577×10 2 2.594×10 2 9.856×10 3 -1.502×10 4
6 -4.349 6.387×10 -1 -4.388 4.554 4.049×10 -1.722×10 2 -4.079×10 2 2.329×10 3 -2.636×10 3
7 5.354×10 -1 -1.976 3.103 4.213 -1.617×10 -1.048×10 2 7.966×10 5.665×10 2 -8.188×10 2
8 -3.980 -1.286 5.246 -1.892×10 -1.498×10 4.478×10 -4.590×10 -1.339×10 2.491×10 2
9 -2.156 -1.527 -1.031 1.596×10 -3.999×10 -4.442×10 9.926×10 2.076×10 2 -3.142×10 2
And, as shown in table 13 according to the imaging lens system of embodiment 2 as can be known, the formula that all satisfies condition (1)～(6).And the total length of lens combination is set to 1.25mm.
Fig. 5 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 2, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 2, and each aberration of revisal well.
And Fig. 6 represents the 3rd lens L among the embodiment 2 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
(embodiment 3)
Fig. 7 represents the schematic configuration of the imaging lens system of embodiment 3.This imaging lens system structure, roughly the same with embodiment 1, in the drawing explanation of correspondence,, omit the explanation of its repetition about the additional same-sign of identical key element.But, be the first lens L with the difference of embodiment 1 1The deep camber face towards two convex lens of object side, aperture 2 is positioned at the first lens L 1With the second lens L 2Between, aperture in the middle of being regarded as.
In this imaging lens system, at the first lens L 1～the four lens L 4The lens face of each lens be formed with aspheric surface.The top interval D (mm) of axle of the radius of curvature R (mm) of each lens face of this imaging lens system of table 5 expression, each lens, each lens reach the Abbe number γ on the d line at the refractive index N on the d line value.And, the order that the numeral in the table begins from object side (the 3rd is the aperture face, and the 12 is shooting face).And, expression in the table 6, about each aspheric surface, aspheric each constant K, A as shown in above-mentioned aspheric surface formula 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, be set to 1.0mm in the focal distance f of the whole lens combination of embodiment 3.
[table 5]
Face R D N dv d
*1 0.5371 0.16224 1.469689 78.0
*2 -1.8316 0.01722
STO 3 ∞ 0.24136
*4 -0.3687 0.12928 1.608166 28.0
*5 -0.9144 0.01722
*6 0.4240 0.17937 1.510810 56.0
*7 0.4216 0.05010
*8 0.2767 0.14684 1.510810 56.0
*9 0.3235 0.12054
10 ∞ 0.06888 1.518249 64.1
11 ∞ 0.12192
IMG 12 ∞
* aspheric surface
[table 6]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
1 3.213 -5.704×10 -1 4.783 -6.239×10 6.755×10 5.492×10 2 3.605×10 2 -1.919×10 4 3.482×10 4
2 1.000 -2.350×10 -1 2.235 -4.584×10 1.455×10 1.253×10 3 -8.140×10 2 -4.365×10 4 1.298×10 5
4 1.677 1.047 -3.782 5.516×10 2.383×10 -7.785×10 2 -1.080×10 3 2.664×10 4 -5.028×10 4
5 1.021 -5.821×10 -2 -1.862×10 9.419×10 -1.508×10 -6.207×10 2 -1.033×10 2 8.253×10 3 -1.246×10 4
6 -5.977 -1.913 4.037 2.363 -6.904 -1.393×10 2 1.933×10 1.637×10 3 -3.258×10 3
7 6.252×10 -1 -1.610 -7.983 1.264×10 2.097×10 -1.096×10 2 -2.604×10 3.690×10 2 -4.452×10 2
8 -7.366 2.543 -8.566 -2.427×10 2.259 7.981×10 1.198×10 2 4.733×10 -4.732×10 2
9 -4.193 1.788 -1.146×10 1.060×10 -1.295×10 -8.499 7.231×10 1.067×10 2 -2.586×10 2
And, as shown in table 13, according to the imaging lens system of embodiment 3 as can be known, the formula that all satisfies condition (1)～(7).And the total length of lens combination is set to 1.25mm.
Fig. 8 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 3, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 3, and each aberration of revisal well.
And Fig. 9 represents the 3rd lens L among the embodiment 3 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
(embodiment 4)
Figure 10 represents the schematic configuration of the imaging lens system of embodiment 4.This imaging lens system structure, roughly the same with embodiment 1, in the drawing explanation of correspondence,, omit the explanation of its repetition about the additional same-sign of identical key element.But, be that with the difference of embodiment 1 aperture 2 is present in the first lens L 1In.
Also have, in this imaging lens system, at the first lens L 1～the four lens L 4The lens face of each lens be formed with aspheric surface.The top interval D (mm) of axle of the radius of curvature R (mm) of each lens face of this imaging lens system of table 7 expression, each lens, each lens reach the Abbe number γ on the d line at the refractive index N on the d line value.And, the order that the numeral in the table begins from object side (first is the aperture face, and the 12 is shooting face).And, expression in the table 8, about each aspheric surface, aspheric each constant K, A as shown in above-mentioned aspheric surface formula 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, be set to 1.0mm in the focal distance f of the whole lens combination of embodiment 4.
[table 7]
Face R D N dv d
STO 1 ∞ -0.01948
*2 0.3689 0.24012 1.472819 77.6
*3 17.3941 0.15241
*4 -0.4706 0.12772 1.609211 27.2
*5 -1.2983 0.01948
*6 0.7869 0.14115 1.512221 56.2
*7 0.9131 0.03576
8 0.3385 0.16252 1.512221 56.2
9 0.2711 0.13636
10 ∞ 0.05844 1.518249 64.1
11 ∞ 0.08026
IMG 12 ∞
* aspheric surface
[table 8]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
2 2.484 -3.093×10 -1 8.878×10 -1 -3.478×10 -1.130×10 2 6.121×10 2 7.703×10 2 7.262×10 3 -1.004×10 5
3 5.268×10 -2.114×10 -1 -1.004 -1.313×10 -3.705×10 4.979×10 -3.777×10 2 -8.922×10 3 1.473×10 4
4 2.829 -8.854×10 -1 -2.390 5.035×10 -3.423×10 2 -9.049×10 2 6.825×10 3 4.181×10 4 -2.553×10 5
5 -2.406 -3.163 -9.610 7.715×10 1.971×10 -4.057×10 2 -5.050×10 2 2.367×10 3 2.076×10 3
6 -4.893×10 -2.926 8.618 4.731 -2.825×10 -1.298×10 2 1.042×10 2 1.190×10 3 -2.118×10 3
7 -1.182×10 -2.621×10 -1 -1.406 -2.610 2.505 -6.349 8.808 8.254×10 -1.868×10 2
8 -1.265×10 1.122 -1.051×10 -1.643 1.360×10 4.691×10 -2.425×10 -3.312×10 -2.997×10
9 -4.883 5.713×10 -2 -6.687 1.347×10 -1.218×10 -1.488×10 3.326×10 2.724×10 -5.623×10
And, as shown in table 13, according to the imaging lens system of embodiment 4 as can be known, the formula that all satisfies condition (1)～(3), (5), (6).And the total length of lens combination is set to 1.15mm.
Figure 11 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 4, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 4, and each aberration of revisal well.
And Figure 12 represents the 3rd lens L among the embodiment 4 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
(embodiment 5)
Figure 13 represents the schematic configuration of the imaging lens system of embodiment 5.This imaging lens system structure, roughly the same with embodiment 4, in the drawing explanation of correspondence,, omit the explanation of its repetition about the additional same-sign of identical key element.Be that with the identical point of embodiment 4 aperture 2 is present in the first lens L 1In.
In this imaging lens system, at the first lens L 1～the four lens L 4The lens face of each lens be formed with aspheric surface.The top interval D (mm) of axle of the radius of curvature R (mm) of each lens face of this imaging lens system of table 9 expression, each lens, each lens reach the Abbe number γ on the d line at the refractive index N on the d line value.And, the order that the numeral in the table begins from object side (first is the aperture face, and the 12 is shooting face).And, expression in the table 10, about each aspheric surface, aspheric each constant K, A as shown in above-mentioned aspheric surface formula 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, be set to 1.0mm in the focal distance f of the whole lens combination of embodiment 5.
[table 9]
Face R D N dv d
STO 1 ∞ -0.03598
*2 0.3539 0.21440 1.472819 77.6
*3 5.0596 0.17418
*4 -0.3890 0.13492 1.608166 27.2
*5 -1.1267 0.01799
6 1.0634 0.15986 1.512221 56.2
*7 1.7431 0.02873
*8 0.2988 0.15354 1.512221 56.2
*9 0.2761 0.12592
10 ∞ 0.05397 1.518249 64.1
11 ∞ 0.11244
IMG 12 ∞
* aspheric surface
[table 10]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
2 2.153 -5.606×10 -1 4.206 -4.896×10 3.602 2.312×10 2 7.067×10 2 -6.655×10 3 -1.889×10 4
3 4.018×10 -4.565×10 -2 -2.447 -5.303 3.506 2.075×10 2 -8.900×10 2 -2.164×10 4 5.896×10 4
4 2.105 -1.237 -4.509 4.857×10 -2.315×10 2 -8.401×10 2 5.243×10 3 4.313×10 4 -2.385×105
5 3.382 -3.536 -1.346×10 1.045×10 2 3.272×10 -6.558×10 2 -9.728×10 2 3.735×10 3 5.179×10 3
6 -2.211×10 2 -2.391 1.205×10 4.960 -5.283×10 -2.161×10 2 1.138×10 2 2.322×10 3 -3.828×10 3
7 9.331×10 -1 1.034×10 -1 -4.373×10 -1 -3.410 -1.294 -2.037×10 -2.455×10 2.610×10 2 -3.958×10 2
8 -7.617 2.285 -1.199×10 -5.598 1.273×10 6.217×10 -5.038×10 -4.803×10 4.845×10
9 -2.707 7.338×10 -2 -7.828 1.566×10 -1.849×10 -2.064×10 6.325×10 5.778×10 -1.331×10 2
And, as shown in table 13, according to the imaging lens system of embodiment 5 as can be known, the formula that all satisfies condition (1)～(3), (5), (6).And the total length of lens combination is set to 1.15mm.
Figure 14 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 5, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 5, and each aberration of revisal well.
And Figure 15 represents the 3rd lens L among the embodiment 5 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
(embodiment 6)
Figure 16 represents the schematic configuration of the imaging lens system of embodiment 6.This imaging lens system structure, roughly the same with embodiment 4, in the drawing explanation of correspondence,, omit the explanation of its repetition about the additional same-sign of identical key element.But, be that with the identical point of embodiment 4 aperture 2 is present in the first lens L 1In.
In this imaging lens system, at the first lens L 1～the four lens L 4The lens face of each lens be formed with aspheric surface.The top interval D (mm) of axle of the radius of curvature R (mm) of each lens face of this imaging lens system of table 11 expression, each lens, each lens reach the Abbe number γ on the d line at the refractive index N on the d line value.And, the order that the numeral in the table begins from object side (first is the aperture face, and the 12 is shooting face).And, expression in the table 12, about each aspheric surface, aspheric each constant K, A as shown in above-mentioned aspheric surface formula 3, A 4, A 5, A 6, A 7, A 8, A 9, A 10Value.Also have, be set to 1.0mm in the focal distance f of the whole lens combination of embodiment 6.
[table 11]
Face R D N dv d
STO 1 ∞ -0.01953
*2 0.3712 0.24183 1.472819 77.6
*3 48.8731 0.15155
*4 -0.4622 0.12952 1.609211 27.2
*5 -1.2721 0.01953
6 0.7893 0.14191 1.512221 56.2
*7 0.8858 0.03539
*8 0.3334 0.16353 1.512221 56.2
*9 0.2716 0.13669
10 ∞ 0.05858 1.518249 64.1
11 ∞ 0.07975
IMG 12 ∞
* aspheric surface
[table 12]
Face K A 3A 4A 5A 6A 7A 8A 9A 10
2 2.464 -3.188×10 -1 1.088 -3.459×10 -1.138×10 2 6.059×10 2 8.422×10 2 7.243×10 3 -9.837×10 4
3 -3.009×10 -1.757×10 -1 -1.210 -1.338×10 -3.823×10 4.418×10 -3.716×10 2 -8.748×10 3 1.358×10 4
4 2.848 -8.564×10 -1 -2.430 4.928×10 -3.362×10 2 -8.736×10 2 6.747×10 3 4.087×10 4 -2.516×10 5
5 1.086 -3.192 -9.547 7.642×10 1.942×10 -3.999×10 2 -4.942×10 2 2.340×10 3 2.135×10 3
6 -4.819×10 -2.919 8.205 5.027 -2.832×10 -1.211×10 2 8.263×10 1.187×10 3 -2.144×10 3
7 -1.130×10 -3.155×10 -1 -1.321 -2.566 2.271 -6.690 8.322 8.097×10 -1.984×10 2
8 -1.252×10 1.162 -1.045×10 -1.764 1.321×10 4.619×10 -2.379×10 -3.205×10 -2.791×10
9 -5.027 1.758×10 -1 -6.826 1.330×10 -1.196×10 -1.459×10 3.340×10 2.642×10 -5.596×10
And, as shown in table 13, according to the imaging lens system of embodiment 6 as can be known, the formula that all satisfies condition (1)～(3), (5), (6).And the total length of lens combination is set to 1.15mm.
Figure 17 is spherical aberration, the astigmatism of the imaging lens system of expression embodiment 6, the aberration diagram of distortion.And on the astigmatism figure there be to the aberration of image planes and tangential image planes radially expression.In these aberration diagrams, ω represents angle of half field-of view.From these aberration diagrams obviously as can be known, can shorten the total length of lens combination by the imaging lens system of embodiment 6, and each aberration of revisal well.
And Figure 18 represents the 3rd lens L among the embodiment 6 3With the 4th lens L 4Between the shape of air lens front-back carry out each curve of a subdifferential and second differential.
[table 13]
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6
v d1 78.0 80.0 78.0 77.6 77.6 77.6
v d2 28.0 28.0 28.0 27.2 27.2 27.2
R 3R 0.6129 0.6680 0.4216 0.9131 1.7431 0.8858
R 4F 0.2826 0.2611 0.2767 0.3385 0.2988 0.3334
R 4R 0.3040 0.2666 0.3235 0.2711 0.2761 0.2716
R 4F/F 0.2826 0.2611 0.2767 0.3385 0.2988 0.3334
PH 3R 0.275 0.305 0.285 0.265 0.275 0.265
PH 4F 0.265 0.285 0.255 0.225 0.265 0.235
D A1-2 0.16540 0.14642 0.25858 0.15241 0.17418 0.15155
D T1 0.20958 0.23985 0.16224 0.24012 0.21440 0.24183
(1)R 3R＞R 4F＞0 ○ ○ ○ ○ ○ ○
(2)PH 3R＞PH 4F ○ ○ ○ ○ ○ ○
(3)v d2＜35 ○ ○ ○ ○ ○ ○
(4)0＜R 4F＜R 4R ○ ○ ○ × × ×
(5)0＜R 4F/F＜0.5 ○ ○ ○ ○ ○ ○
(6)v d1＞65 ○ ○ ○ ○ ○ ○
(7)D A1-2＞D T1 × × ○ × × ×

Claims (12)

1. imaging lens system is characterized in that:
The 4th lens that constitute from the both-sided aspherical lens that object side is arranged in order first lens that are made of positive lens, second lens that are made of negative lens, the face that has the 3rd lens that the both-sided aspherical lens of limit constitute and an object side in the position beyond the optical axis position as the face of side have limit in the position beyond the optical axis position and constituting
And, the formula that meets the following conditions (1), (2), (3),
R 3R＞R 4F＞0(1)
PH 3R＞PH 4F(2)
γ d2＜35(3)
Wherein,
R 3R: the curvature of centre radius of the picture side of above-mentioned the 3rd lens
R 4F: the curvature of centre radius of the object side of above-mentioned the 4th lens
PH 3R: the above-mentioned limit of the face of the picture side of above-mentioned the 3rd lens is apart from the distance of optical axis
PH 4F: the above-mentioned limit of the face of the object side of above-mentioned the 4th lens is apart from the distance of optical axis
γ D2: the Abbe number of above-mentioned second lens.
2. imaging lens system according to claim 1 is characterized in that,
Described second lens are the meniscus shaped lens of concave surface towards object side.
3. imaging lens system according to claim 1 is characterized in that,
The formula that meets the following conditions (4),
0＜R 4F＜R 4R(4)
Wherein,
R 4R: the curvature of centre radius of the face of the picture side of described the 4th lens.
4. imaging lens system according to claim 1 is characterized in that,
The formula that meets the following conditions (5),
0＜R 4F/F＜0.5(5)
Wherein,
F: the focal length of whole lens combination.
5. imaging lens system according to claim 1 is characterized in that,
The formula that meets the following conditions (6),
γ d1＞65(6)
Wherein,
γ D1: the Abbe number of above-mentioned first lens.
6. imaging lens system according to claim 1 is characterized in that,
Between above-mentioned first lens and above-mentioned second lens, dispose aperture, the formula that meets the following conditions (7),
D A1-2＞D T1(7)
Wherein,
D A1-2: the axle between above-mentioned first lens and above-mentioned second lens is gone up the airspace
D T1: the axle of above-mentioned first lens is gone up thickness.
7. imaging lens system according to claim 1 is characterized in that,
Above-mentioned second lens are made of high dispersive glass.
8. imaging lens system according to claim 1 is characterized in that,
Above-mentioned the 3rd lens are positive meniscus shaped lenses.
9. imaging lens system according to claim 1 is characterized in that,
Above-mentioned the 4th lens are positive meniscus shaped lenses.
10. imaging lens system according to claim 1 is characterized in that,
Above-mentioned the 4th lens are negative meniscus lens.
11. imaging lens system according to claim 1 is characterized in that,
The two sides of described first lens is aspheric surfaces.
12. imaging lens system according to claim 1 is characterized in that,
The two sides of described second lens is aspheric surfaces.
CNB2006100737899A 2005-04-15 2006-04-17 Imaging lens Expired - Fee Related CN100394241C (en)

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