CN1940628A - Image-forming lens - Google Patents
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- CN1940628A CN1940628A CN 200610139617 CN200610139617A CN1940628A CN 1940628 A CN1940628 A CN 1940628A CN 200610139617 CN200610139617 CN 200610139617 CN 200610139617 A CN200610139617 A CN 200610139617A CN 1940628 A CN1940628 A CN 1940628A
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- 238000003384 imaging method Methods 0.000 claims abstract description 123
- 230000005499 meniscus Effects 0.000 claims abstract description 9
- 239000000571 coke Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000005304 optical glass Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 57
- 238000010586 diagram Methods 0.000 description 31
- 230000003287 optical effect Effects 0.000 description 12
- 201000009310 astigmatism Diseases 0.000 description 11
- 239000006059 cover glass Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 206010010071 Coma Diseases 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides an image-forming lens, including: a first lens G1 is a positive lens, whose surface on an object side is formed to be convex; a second lens G2 being a negative meniscus lens whose surface on the object side; and a third lens G3 a positive lens; and a forth lens G4 being a meniscus lens whose surface on the object side is formed to be concave paraxially; and the image-forming lens fully satisfies conditional expression (1)-(5), thereby realize compact and insure high imaging performance. The focal power of the first lens determined by conditional expression (1), dispersion is determined by conditional expression (2) and (3), the focal power of the second lens determined by conditional expression (4), the focal power of the thirrd lens determined by conditional expression (5). Thereby, an image-forming lens with more compact structure but with high imaging performance is provided.
Description
Technical field
The present invention relates to a kind of be suitable for carrying charge coupled cell) or the fixed-focus imaging len of the small-sized image pickup devices such as camera of the digital camera of CMOS (Complementary Metal Oxide Semiconductor (the complementary metal oxide semiconductor (CMOS))) imaging apparatus of etc.ing and use silver salt film use CCD (Charge Coupled Device:.
Background technology
In recent years, along with personal computer spreads in general family etc., image informations such as the landscape that photographs and bust can be input to personal computer digital still life camera (below, be called digital camera simply.) popularizing hastily.And along with the multifunction of mobile phone, (モ ジ ユ one Le カ メ ラ: modulecamera) situation of (portable module camera: carry the one Le カ メ ラ with モ ジ ユ) also increases with the module camera to be equipped with the image input in the mobile phone.
In these camera heads, use imaging apparatuss such as CCD or CMOS always.In recent years, such camera head because the miniaturization of imaging apparatus is underway always, has also been sought extremely miniaturization as device integral body thus.In addition, the high pixelation of imaging apparatus is also underway always, thereby seeks high image resolution and high performance.
As the employed imaging len of the camera head after such miniaturization, the lens of putting down in writing in the following patent documentation are for example arranged.In patent documentation 1,2, record the imaging len of 3 pieces of structures respectively.In patent documentation 3～6, record the imaging len of 4 pieces of structures respectively.In the imaging len of patent documentation 3 record, between object side the 2nd lens and the 3rd lens, disposing lens stop, in the imaging len of patent documentation 4 records, lens stop is configured in the position of close object side.In the imaging len of patent documentation 5,6 record, lens stop is configured in the position of the most close object side or is configured in between object side the 1st lens and the 2nd lens.
[patent documentation 1] Japanese kokai publication hei 10-48516 communique
[patent documentation 2] TOHKEMY 2002-221659 communique
[patent documentation 3] TOHKEMY 2004-302057 communique
[patent documentation 4] TOHKEMY 2005-24581 communique
[patent documentation 5] TOHKEMY 2005-4027 communique
[patent documentation 6] TOHKEMY 2005-4028 communique
Summary of the invention
As mentioned above like that in recent years, imaging apparatus miniaturization and high pixelation are underway always, follow in this, and the imaging len that special logarithmic code camera is used requires hi-vision resolution performance and structure miniaturization.On the other hand, imaging len for the portable module camera, in the past mainly aspect cost and the miniaturization aspect have requirement, even if but in the portable module camera, also exist recently the tendency of the high pixelation of imaging apparatus, the requirement to aspect of performance has also improved thus.
Therefore, expectation is developed at the diversified lens that can synthetically be improved aspect cost, imaging performance and the miniaturization, for example, expectation develop enter sight line not only guarantee also can carry the magazine miniaturization of portable module and also can carry the imaging len of the low-cost and high-performance in the digital camera at aspect of performance.
For such requirement, for example, may be thought of as and sought miniaturization and cost degradation is made as 3 pieces or 4 pieces of structures with a lens piece number, use aspheric surface energetically in order to seek high performance.At this moment, though aspheric surface helps miniaturization and high performance, because unfavorable and cost is easy to increase aspect manufacturing, so aspheric use is preferably the use that takes into full account after the manufacturing.The lens of above-mentioned each patent documentation record are to use structure after the aspheric surface in the mode of 3 pieces or 4 pieces structures, but are inadequate making imaging performance and miniaturization become cubic plane simultaneously for example.
The present invention makes in view of relevant issues point, and its purpose is, is the imaging len that miniaturization structure can obtain high imaging performance though provide a kind of.
Imaging len of the present invention possesses in turn from object side: the 1st lens, and it has the positive light coke of convex surface towards object side; The 2nd lens, it has the negative power of concave surface towards object side; The 3rd lens, it has positive light coke; With the 4th lens, it has near paraxial convex surface towards the meniscus shape of object side; And constitute in the mode that satisfies following conditional (1)～(5) fully.
0.7＜f1/f＜1.1 (1)
1.45＜n1＜1.6 (2)
ν1＞60 (3)
0.8＜|f2/f|＜1.8 (4)
1.9＜f3/f＜20 (5)
Wherein, f1 is the focal length of the 1st lens, and f is whole focal length, and n1 is the refractive indexes of the 1st lens with respect to the d line, and ν 1 is the Abbe numbers of the 1st lens with respect to the d line, and f2 is the focal length of the 2nd lens, and f3 is the focal length of the 3rd lens.
In imaging len of the present invention, not only make miniaturization become possibility by 4 pieces of less like this lens piece numbers, and can obtain also can with carried for example corresponding imaging performance of digital camera of the imaging apparatus of 5,000,000 pixels.Particularly, because the 1st lens have the such focal power of the formula of satisfying condition (1), not only can suppress thus to maximize and can suppress the increase of spherical aberration.Further, the 1st lens are formed by the formula of satisfying condition (2), (3) such lens material, thereby axial chromatic aberration is reduced.And, owing to constitute in the mode of the formula of satisfying condition (4), (5), thus high order such as correcting spherical aberration and coma aberration preferably, and can realize miniaturization.
In imaging len of the present invention, can further satisfy following conditional (6).
bf/TL＞0.2 (6)
Wherein, bf is the distance (air converts, and is about to actual range and is scaled distance in the air dielectric) till from the face of the picture side of the 4th lens to imaging surface, and TL is the distance (air conversion) till from the face of the object side of the 1st lens to imaging surface.When satisfying this conditional, just can guarantee back focal length (back-focus) more fully.
In imaging len of the present invention, can further satisfy following conditional (7).
TL/(2×Ih)＜1.1 (7)
Wherein, Ih is the maximum image height in the imaging surface.When satisfying this conditional, just can realize further miniaturization.
In imaging len of the present invention, the 1st lens～the 4th lens preferably comprise at least one aspheric surface respectively.By carrying out like this, can obtain high aberration performance with comparalive ease.In addition, when the 1st lens are made of optical glass and the 2nd lens～the 4th lens when all being made of resin material, just can realize also realizing lightweight when each aberration (particularly aberration) reduces.
In imaging len of the present invention, further, can between the face position of the object side on the 1st lens axis and the face position on the 1st lens axis, dispose lens stop as side.Carry out just favourable like this to shortening total length.
According to imaging len of the present invention, possess in turn from object side: the 1st lens, it is the positive lens of convex surface towards object side; The 2nd lens, it is the negative lens of concave surface towards object side; The 3rd lens, it is a positive lens; With the 4th lens, its be near paraxial convex surface towards the lens of the meniscus shape of object side; And described imaging len constitutes in the mode that satisfies following conditional (1)～(5) fully, not only can realize miniaturization thus and can guarantee high imaging performance.
Description of drawings
Fig. 1 is the figure of expression as the 1st structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 1.
Fig. 2 is the figure of expression as the 2nd structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 2.
Fig. 3 is the figure of expression as the 3rd structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 3.
Fig. 4 is the figure of expression as the 4th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 4.
Fig. 5 is the figure of expression as the 5th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 5.
Fig. 6 is the figure of expression as the 6th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 6.
Fig. 7 is the figure of expression as the 7th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 7.
Fig. 8 is the figure of expression as the 8th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 8.
Fig. 9 is the figure of expression as the 9th structure example in the imaging len of one embodiment of the present invention, is the sectional view corresponding to embodiment 9.
Figure 10 is the key diagram of basic lens data in the imaging len of expression embodiment 1.
Figure 11 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 1.
Figure 12 is the key diagram of basic lens data in the imaging len of expression embodiment 2.
Figure 13 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 2.
Figure 14 is the key diagram of basic lens data in the imaging len of expression embodiment 3.
Figure 15 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 3.
Figure 16 is the key diagram of basic lens data in the imaging len of expression embodiment 4.
Figure 17 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 4.
Figure 18 is the key diagram of basic lens data in the imaging len of expression embodiment 5.
Figure 19 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 5.
Figure 20 is the key diagram of basic lens data in the imaging len of expression embodiment 6.
Figure 21 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 6.
Figure 22 is the key diagram of basic lens data in the imaging len of expression embodiment 7.
Figure 23 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 7.
Figure 24 is the key diagram of basic lens data in the imaging len of expression embodiment 8.
Figure 25 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 8.
Figure 26 is the key diagram of basic lens data in the imaging len of expression embodiment 9.
Figure 27 is the key diagram of relevant aspherical surface data in the imaging len of expression embodiment 9.
Figure 28 is the key diagram corresponding to the numerical value of formula (1)～(7) in each imaging len of expression embodiment 1～9.
Figure 29 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 1.
Figure 30 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 2.
Figure 31 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 3.
Figure 32 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 4.
Figure 33 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 5.
Figure 34 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 6.
Figure 35 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 7.
Figure 36 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 8.
Figure 37 is the aberration diagram of spherical aberration, astigmatism and distortion in the imaging len of expression embodiment 9.
Among the figure: G1～G4-the 1st lens～the 4th lens, CG-cover glass, Si-are from object side i lens face, and Ri-is from the radius-of-curvature of object side i lens face, and Di-is from the face interval of object side i lens face and i+1 lens face, Z1-optical axis.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are at length described.
Fig. 1 represents as the 1st structure example in the imaging len of one embodiment of the present invention.This structure example is corresponding to the lens arrangement of the 1st numerical value embodiment described later (Figure 10, Figure 11).In addition, Fig. 2～Fig. 9 represents the 2nd in the present embodiment～the 9th structure example respectively.The 2nd structure example is corresponding to the 2nd numerical value embodiment (Figure 12 described later, lens arrangement Figure 13), the 3rd structure example is corresponding to the 3rd numerical value embodiment (Figure 14 described later, lens arrangement Figure 15), the 4th structure example is corresponding to the 4th numerical value embodiment (Figure 16 described later, lens arrangement Figure 17), the 5th structure example is corresponding to the 5th numerical value embodiment (Figure 18 described later, lens arrangement Figure 19), the 6th structure example is corresponding to the 6th numerical value embodiment (Figure 20 described later, lens arrangement Figure 21), the 7th structure example is corresponding to the 7th numerical value embodiment (Figure 22 described later, lens arrangement Figure 23), the 8th structure example is corresponding to the 8th numerical value embodiment (Figure 24 described later, lens arrangement Figure 25), the 9th structure example is corresponding to the 9th numerical value embodiment (Figure 26 described later, lens arrangement Figure 27).In Fig. 1～Fig. 9, symbol Si represents that face with the inscape of close object side is as the 1st, to add the i face of label i along with the mode that increases in turn to picture side (imaging side).The radius-of-curvature of symbol Ri presentation surface Si.Symbol Di represents i face Si and the i+1 face Si+1 face on optical axis Z1 at interval.Also have, because the basic comprising of each structure example all is identical, so, below describe as the basis with the structure example of imaging len shown in Figure 1, also the structure example of Fig. 2～Fig. 9 is described as required.
This imaging len for example can carry in portable module camera that has adopted imaging apparatuss such as CCD or CMOS or digital camera etc. and use.This imaging len, it constitutes from object side and is equipped with in turn along optical axis Z1: lens stop St, the 1st lens G1, the 2nd lens G2, the 3rd lens G3 and the 4th lens G4.Imaging surface (imaging surface) S at this imaging len
ImgOn dispose imaging apparatuss (not drawing among the figure) such as CCD.Near the imaging surface of imaging apparatus, dispose the cover glass CG that is used to protect imaging surface.Between the 4th lens G4 and imaging surface (imaging surface), except that cover glass CG, also can dispose other opticses such as cutoff filter and low pass filter.
The 1st lens G1, be formed on paraxial near near (optical axis) convex surface towards the meniscus shape of object side and have positive focal power.But as the 6th, the 9th structure example, the 1st lens G1 also can form the biconvex shape near paraxial.The 1st lens G1, the face S1 of preferred object side and be aspheric surface for example as at least one side among the face S2 of side, preferred especially two face S1, S2 are all aspheric surface.The 1st lens G1 like this is made of the little optical glass of chromatic dispersion.In addition, about lens stop St, reduce in order to make the incident angle that incides imaging apparatus, it is favourable then being configured on the position of being partial to object side as far as possible.On the other hand, when lens stop St is positioned at the more close object side of specific surface S1 since will this part (distance of lens stop St and face S1) as the optical length addition, unfavorable aspect integrally-built miniaturization (slimming: hang down the back of the bodyization (て い せ い か)) thus.On those grounds, lens stop St preferred disposition is between the face S1 and face S2 on the optical axis Z1.
The 2nd lens G2, be formed on paraxial near concave surface towards the meniscus shape of object side and have negative focal power.But as the 9th structure example, the 2nd lens G2 also can be formed on and be the concave-concave shape near paraxial.The 2nd lens G2, the face S3 of preferred object side and be aspheric surface for example as at least one side among the face S4 of side, preferred especially two face S3, S4 are all aspheric surface.
The 3rd lens G3, be formed on paraxial near convex surface towards the meniscus shape of object side and have positive focal power.The 3rd lens G3, for example the face S5 of preferred object side and be aspheric surface as at least one side among the face S6 of side.Particularly in the effective diameter scope, face S5 is preferably the aspherical shape that the positive focal power of approaching more periphery just becomes weak more, and face S6 is preferably the aspherical shape that the negative focal power of approaching more periphery just becomes weak more.Just, be that convex form is the aspheric surface of concave shape at peripheral part though the face S5 of object side is preferably near paraxial, be that concave shape is the aspheric surface of convex form at peripheral part though be preferably near paraxial as the face S6 of side.
The 4th lens G4 is formed near the meniscus shape of paraxial convex surface towards object side, for example has positive focal power.The 4th lens G4, for example the face S7 of preferred object side and be aspheric surface as at least one side among the face S8 of side.Particularly in the effective diameter scope, face S7 is preferably the aspherical shape that the positive focal power of approaching more periphery just becomes weak more, and face S8 is preferably the aspherical shape that the negative focal power of approaching more periphery just becomes weak more.Just, be that convex form is the aspheric surface of concave shape at peripheral part though the face S7 of object side is preferably near paraxial, be that concave shape is the aspheric surface of convex form at peripheral part though be preferably near paraxial as the face S8 of side.
In addition, shape and larger-size the 2nd lens G2～the 4th lens G4 that has than the 1st lens G1 complexity all is made of resin material.Therefore, complicated aspherical shape not only can be formed accurately, and lightweight can be sought as imaging len integral body.
Further, this imaging len constitutes in the mode of the formula that meets the following conditions fully (1)～(5).
0.7＜f1/f＜1.1 (1)
1.45＜n1＜1.6 (2)
ν1＞60 (3)
0.8＜|f2/f|＜1.8 (4)
1.9＜f3/f＜20 (5)
Wherein, f1 is the focal length of the 1st lens G1, and f is whole focal length, and n1 is the refractive index of the 1st lens G1 with respect to the d line, and ν 1 is the Abbe numbers of the 1st lens with respect to the d line, and f2 is the focal length of the 2nd lens G2, and f3 is the focal length of the 3rd lens G3.
In this imaging len, the formula that can further meet the following conditions (6).
bf/TL＞0.2 (6)
Wherein, bf is that face S7 from the picture side of the 4th lens G4 is to imaging surface S
ImgTill distance (air conversion), TL is that face S1 from the object side of the 1st lens G1 is to imaging surface S
ImgTill distance (air conversion).
In this imaging len, the formula that can further meet the following conditions (7).
TL/(2×Ih)＜1.1 (7)
Wherein, Ih is the maximum image height in the imaging surface.
Below, the effect and the effect of the imaging len of the present embodiment that as above constitutes like that described.
In imaging len of the present invention, make each lens face of the 1st lens G1～the 4th lens G4 form the aspherical shape that reaches the inferior asphericity coefficient regulation of odd number by even number, not only can realize miniaturization thus by 4 pieces of less like this lens piece numbers, and can obtain also can with carried for example corresponding imaging performance of digital camera of the imaging apparatus of 5,000,000 pixels.Particularly, because the 1st lens G1 has the such focal power of the formula of satisfying condition (1), not only can suppress thus to maximize and also can suppress the increase of spherical aberration.Further, owing to the 1st lens G1 is formed by the formula of satisfying condition (2), (3) such optical glass, thereby axial chromatic aberration is reduced.And, owing to constitute in the mode of the formula of satisfying condition (4), (5), thus high order such as correcting spherical aberration and coma aberration preferably, and help miniaturization.Further, when the mode with the formula of satisfying condition (6), (7) constitutes, just not only guarantee sufficient back focus and realize further miniaturization.In addition, because lens stop St is configured on the face S1 and the position between face S2 on the optical axis Z1, so total length is further shortened.Below, the meaning of conditional (1)～(7) is at length described.
Conditional (1) is the formula of the proper range of expression amount (f1/f), and this amount (f1/f) is the amount of the focal power (1/f1) of expression the 1st lens G1 with respect to the size of the focal power (1/f) of total system.Distribute to rationalize by the focal power that makes the 1st lens G1, can make the correction of each aberration and back focal length fully guarantee carry out according to very balanced mode.At this, when the lower limit that is lower than conditional (1) and the positive light coke of the 1st lens G1 too during grow, the correction of spherical aberration was not only insufficient but also cause the maximization of total system.On the other hand, when the upper limit that surpasses conditional (1) and the positive light coke of the 1st lens G1 when too dying down just can not fully be guaranteed back focal length.
The chromatic dispersion of the employed optical glass of the 1st lens G1 with respect to the d line stipulated in conditional (2), (3).Chromatic dispersion can be suppressed by the formula of satisfying condition (2), (3), the reduction of axial chromatic aberration can be sought thus.
Conditional (4) is the formula of the proper range of expression amount (f2/f), and this amount (f2/f) is the amount of the focal power (1/f2) of expression the 2nd lens G2 with respect to the size of the focal power (1/f) of total system.Distribute rationalization by the focal power that makes the 2nd lens G2, can proofread and correct each aberration preferably.At this, when the lower limit that is lower than conditional (4) and the negative power of the 2nd lens G2 too during grow just causes the increase of high order aberration.On the other hand, when the upper limit that surpasses conditional (2) and the negative power of the 2nd lens G2 when too dying down, the difficulty that just becomes of the correction of spherical aberration or coma mainly.Particularly, under this imaging len meets the following conditions the situation of formula (8), just can carry out better aberration correction.
0.9＜|f2/f|＜1.1 (8)
Conditional (5) is the formula of the proper range of expression amount (f3/f), and this amount (f3/f) is the amount of the focal power (1/f3) of expression the 3rd lens G3 with respect to the size of the focal power (1/f) of total system.Distribute to rationalize by the focal power that makes the 3rd lens G3, can make the correction of each aberration and back focal length fully guarantee carry out according to very balanced mode.At this, when the lower limit that is lower than conditional (5) and the positive light coke of the 3rd lens G3 too during grow just can not fully be guaranteed back focal length.On the other hand, when the upper limit that surpasses conditional (5) and the positive light coke of the 3rd lens G3 when too dying down, the aberration correction difficulty that just becomes fully.Particularly, under the situation of the formula of meeting the following conditions (9), can make back focal length fully guarantee and preferably aberration correction carry out according to very balanced mode.
3.0＜f3/f＜10 (9)
The miniaturization of conditional (6), (7) regulation imaging len integral body.Satisfy condition (6) just can guarantee back focal length more fully.Particularly, under the situation of the formula of meeting the following conditions (10), can guarantee bigger back focal length.In addition, satisfy condition (7) just can realize further miniaturization.Particularly, under the situation of the formula of meeting the following conditions (11), can obtain further miniaturization.
bf/TL＞0.23 (10)
TL/(2×Ih)＜1.0 (11)
Like this,, the 1st lens G1～the 4th lens G4 is constituted and satisfy the defined terms formula in the above described manner, not only can realize miniaturization thus and can guarantee high imaging performance according to the imaging len of present embodiment.
Then, the concrete numerical value embodiment of the imaging len that present embodiment is related to describes.Below, the 1st numerical value embodiment is described to overview the 1st～the 9th numerical value embodiment (embodiment 1～9) as the basis.
Figure 10, Figure 11 represent the concrete lens data (embodiment 1) corresponding to imaging lens structure shown in Figure 1.Figure 10 represents basic lens data, and Figure 11 represents the data relevant with aspherical shape.Similarly, Figure 12, Figure 13 represent the concrete lens data (embodiment 2) corresponding to the 2nd structure example (Fig. 2).Similarly, Figure 14, Figure 15 represent the concrete lens data (embodiment 3) corresponding to the 3rd structure example (Fig. 3).Similarly, Figure 16, Figure 17 represent the concrete lens data (embodiment 4) corresponding to the 4th structure example (Fig. 4).Similarly, Figure 18, Figure 19 represent the concrete lens data (embodiment 5) corresponding to the 5th structure example (Fig. 5).Similarly, Figure 20, Figure 21 represent the concrete lens data (embodiment 6) corresponding to the 6th structure example (Fig. 6).Similarly, Figure 22, Figure 23 represent the concrete lens data (embodiment 7) corresponding to the 7th structure example (Fig. 7).Similarly, Figure 24, Figure 25 represent the concrete lens data (embodiment 8) corresponding to the 8th structure example (Fig. 8).Similarly, Figure 26, Figure 27 represent the concrete lens data (embodiment 9) corresponding to the 9th structure example (Fig. 9).
In the face sequence number Si hurdle in basic lens data shown in Figure 10, the symbol Si of expression and imaging len shown in Figure 1 corresponding, except that lens stop St the general the face of the inscape of close object side as the 1st and along with towards the sequence number of having added i (i=1～10) face of label to increase mode in turn as side.In radius of curvature R i hurdle, expression corresponding to symbol Ri shown in Figure 1 from the value of the radius-of-curvature of object side i face.The symbol that face interval D i also represents on the hurdle to add corresponding to Fig. 1, from object side i face Si and i+1 face Si+1 the interval on optical axis.The unit of the value of radius of curvature R i and face interval D i is a millimeter (mm).In Ndj, vdj hurdle, respectively the expression also comprise cover glass CG and from object side j (j=1～5) lens key element with respect to the refractive index of d line (wavelength 587.6nm) and the value of Abbe number.Also have, the radius of curvature R 9 on cover glass CG two sides, the value of R10 are 0 (zero), and expression is the plane thus.In addition, in the face interval D i hurdle of lens stop, face S1 on the expression optical axis and the distance (mm) of lens stop St.Negative sign means the more close picture side of lens stop St specific surface S1.At the marge of Figure 10, as each data, represented the focal distance f (mm), F number (FNO.), back focal length bf (mm) of total system simultaneously, from the face S1 of the object side of the 1st lens G1 to imaging S
ImgTill distance (air conversion) TL (mm) and the value of the maximum image height Ih (mm) in the imaging surface.
In Figure 10, the mark " * " that is attached to face sequence number Si left side represents that this lens face is an aspherical shape.In each embodiment, all two sides of the 1st lens G1～the 4th lens G4 are all aspherical shape.In basic lens data, as these aspheric radius-of-curvature, expression has near near the numerical value of the radius-of-curvature of optical axis (paraxial).
In the numerical value of the aspherical surface data of Figure 11, mark " E " represents that the data after it are the end " power exponent " with 10, and expression is by being the numerical value represented of the exponential function at the end and " E " preceding numerical value multiplies each other with 10.For example, if " 1.0E-02 ", then expression " 1.0 * 10
-2" numerical value.
In aspherical surface data, record is by the value of each coefficient Ai, K in the formula of the aspherical shape of following formula (ASP) expression.More specifically, Z represents to have the hang down length (mm) of perpendicular line of tangential plane (plane vertical with optical axis) on aspheric summit of point on the locational aspheric surface of height h from the distance optical axis.
Z＝C·h
2/{1+(1-K·C
2·h
2)
1/2}+∑A
i·h
i (ASP)
Wherein,
Z: the aspheric degree of depth (mm)
H: the distance till from the optical axis to the lens face (highly) (mm)
K: eccentricity
C: paraxial curvature=1/R
(R: paraxial radius-of-curvature)
A
i: the asphericity coefficient of the i time (i is the integer more than 3)
Also have, in any example in embodiment 1～9, all faces of the 1st lens G1～the 4th lens G4 are all aspherical shape.In addition, as asphericity coefficient A
i, can effectively utilize the 3rd time～the 10th time coefficient A
3～A
10But, in the 3rd～the 8th of embodiment 6 and embodiment 7 the 2nd～the 8th, can use the 3rd time～the 16th time coefficient A effectively
3～A
16
Figure 28 briefly represents value corresponding to above-mentioned conditional (1)～(7) at each embodiment.Such as shown in figure 28, the value of each embodiment is positioned at the numerical range of full terms formula (1)～(7).
Spherical aberration, astigmatism and distortion (distortion aberration) in the imaging len of Figure 29 (A)～Figure 29 (C) expression embodiment 1.In each aberration diagram, expression still in spherical aberration diagram, is also represented the aberration at F line (wavelength 486.1nm), C line (wavelength 656.3nm) with the aberration of d line as reference wavelength.In astigmatism figure, solid line is represented the aberration of radial direction, and dotted line is represented the aberration of tangential direction.Similarly, each aberration of the relevant embodiment 2 of expression in Figure 30 (A)～Figure 30 (C).Similarly, each aberration of the relevant embodiment 3 of expression in Figure 31 (A)～Figure 31 (C).Similarly, each aberration of the relevant embodiment 4 of expression in Figure 32 (A)～Figure 32 (C).Similarly, each aberration of the relevant embodiment 5 of expression in Figure 33 (A)～Figure 33 (C).Similarly, each aberration of the relevant embodiment 6 of expression in Figure 34 (A)～Figure 34 (C).Similarly, expression each aberration relevant in Figure 35 (A)～Figure 35 (C) with embodiment 7.Equally, each aberration of the relevant embodiment 8 of expression in Figure 36 (A)～Figure 36 (C).Similarly, each aberration of the relevant embodiment 9 of expression in Figure 37 (A)～Figure 37 (C).
Can know like that from each above lens data and each aberration diagram,, can bring into play fabulous aberration performance about each embodiment.And, also can obtain the miniaturization of total length.
More than, enumerate several embodiments and embodiment and understand the present invention, but the present invention is not limited to the above-described embodiment and examples, can carry out various distortion.For example, the value of the radius-of-curvature of each lens forming composition, face interval and refractive index is not limited to the value shown in above-mentioned each numerical value embodiment, can adopt other value.And in the above-described embodiment and examples, the two sides in the 1st～the 4th lens all is an aspheric surface, but is not to be defined in this.
Claims (8)
1. an imaging len is characterized in that,
Possess in turn from object side:
Convex surface is towards the 1st lens with positive light coke of object side;
Concave surface is towards the 2nd lens with negative power of object side;
The 3rd lens with positive light coke; With
Convex surface is towards the 4th lens of the meniscus shape of object side near paraxial;
And described imaging len constitutes in the mode of the formula that meets the following conditions fully (1)～(5):
0.7＜f1/f＜1.1 (1)
1.45＜n1＜1.6 (2)
ν1＞60 (3)
0.8＜|f2/f|＜1.8 (4)
1.9＜f3/f＜20 (5)
Wherein,
F1: the focal length of the 1st lens,
F: whole focal length,
N1: the 1st lens are with respect to the refractive index of d line,
1: the 1 lens of ν are with respect to the Abbe number of d line,
F2: the focal length of the 2nd lens,
F3: the focal length of the 3rd lens.
2. imaging len according to claim 1 is characterized in that,
Mode with the formula that further meets the following conditions (6) constitutes:
bf/TL＞0.2 (6)
Wherein,
Bf: the distance (air conversion) till from the face of the picture side of the 4th lens to imaging surface,
TL: distance (air conversion) from the face of the object side of the 1st lens to imaging surface.
3. according to claim 1 or the described imaging len of claim 2, it is characterized in that,
Mode with the formula that further meets the following conditions (7) constitutes:
TL/(2×Ih)＜1.1 (7)
Wherein,
Ih: the maximum image height in the imaging surface.
4. according to any one described imaging len in claim 1～claim 3, it is characterized in that,
Described the 2nd lens～the 4th lens comprise at least one aspheric surface respectively.
5. according to any one described imaging len in claim 1～claim 4, it is characterized in that,
Described the 1st lens comprise at least one aspheric surface.
6. according to any one described imaging len in claim 1～claim 5, it is characterized in that,
Described the 2nd lens～the 4th lens all are made of resin material.
7. according to any one described imaging len in claim 1～claim 6, it is characterized in that,
Described the 1st lens are made of optical glass.
8. according to any one described imaging len in claim 1～claim 7, it is characterized in that,
Further, between the face position of the object side on described the 1st lens axis and the face position on described the 1st lens axis, dispose lens stop as side.
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| Publication number | Publication date |
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| JP2011221561A (en) | 2011-11-04 |
| CN100476491C (en) | 2009-04-08 |
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