CN100501489C - Zoom lens system - Google Patents
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- CN100501489C CN100501489C CNB2005101041673A CN200510104167A CN100501489C CN 100501489 C CN100501489 C CN 100501489C CN B2005101041673 A CNB2005101041673 A CN B2005101041673A CN 200510104167 A CN200510104167 A CN 200510104167A CN 100501489 C CN100501489 C CN 100501489C
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Abstract
An object is to provide a zoom lens system having compactness, a high zoom ratio, and high optical performance with preferably correcting various aberrations. The zoom lens system includes, in order from the object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4 having positive refractive power. When a state of lens group positions varies from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 increases, a distance between the second lens group G2 and the third lens group G3 decreases, a distance between the third lens group G3 and the fourth lens group G4 varies, and the fourth lens group G4 moves along a zoom trajectory having a convex shape facing to an image.
Description
The application is in first to file with Japanese patent application JP2004-268952 and JP2005-259575, draws at this to be reference.
Technical field
The present invention relates to a kind of zoom-lens system that is suitable for utilizing the compact camera of solid state image pickup device such as CCD, relate in particular to a kind of zoom-lens system with four lens group structures of Negative-Positive-Negative-positive light coke.
Background technology
As a kind of zoom-lens system that is suitable for solid state image pickup device such as CCD, disclose a kind of zoom-lens system that is made of four lens combination in Japan patented claim JP2003-241092 undetermined, there is the lens combination of a tool positive refraction focal power in this system in the most close thing side.
According to the trend of solid state image pickup device high integration in recent years, need a kind of zoom-lens system that can even under higher characteristic frequency, also can obtain high-contrast.But the problem of bringing is that conventional zoom-lens system will increase the quantity of lens element in order to improve optical property, thereby the diameter of lens becomes big.
Popular along with digital camera also needs in time to satisfy the requirement of portable (specifically being exactly pocket and slim and graceful) and this contradiction of high zoom ratios.
In the disclosed zoom-lens system of Japan patented claim JP2003-241092 undetermined, though pocket property and wide viewing angle are met, zoom ratio is about four or five, so that this requirement of high zoom ratios is not being met.
Summary of the invention
In view of foregoing problems has proposed the present invention.The object of the present invention is to provide and a kind ofly have higher optical property, especially proofreaied and correct various aberrations and have both the zoom-lens system of pocket property and high zoom ratios.
According to an aspect of the present invention, zoom-lens system is made up of following four lens combination from the thing side:
First lens combination with positive refraction focal power;
Second lens combination with negative refraction focal power;
The 3rd lens combination with positive refraction focal power; With
The 4th lens combination with positive refraction focal power,
Wherein when the location status of lens combination when wide-angle end becomes telephoto end, distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination changes, and the 4th lens combination moves along the zoom track that has towards as the protrusion shape of side.
In a preferred embodiment of the invention, when the location status of lens combination when wide-angle end becomes telephoto end, preferred first lens combination is to the thing side shifting.
In a preferred embodiment of the invention, preferably satisfy following conditional expression (1):
0.003<(Δ4a+Δ4b)/TLt<0.1 (1)
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, and TLt is illustrated in total length of lens of zoom-lens system in the telephoto end.
In a preferred embodiment of the invention, preferably satisfy following conditional expression (2):
0.003<Δ4a/(fT-fW)<0.1 (2)
Herein, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
In a preferred embodiment of the invention, preferably satisfy following conditional expression (3):
0.003<Δ4b/(fT-fW)<0.1 (3)
In a preferred embodiment of the invention, preferably satisfy following conditional expression (4):
0.005<M·(Δ4a+Δ4b)/f4<2 (4)
Herein, f4 represents the focal length of the 4th lens combination, and M represents the zoom ratio of zoom-lens system.
In a preferred embodiment of the invention, preferably satisfy following conditional expression (5):
0.5<fM/(fW·fT)
1/2<1.4 (5)
Focal length when herein, fM represents that the 4th lens combination is positioned at the most close picture side position.
In a preferred embodiment of the invention, preferably satisfy following conditional expression (6):
0.3<Δ4b/Δ4a<3.0 (6)
According to a further aspect in the invention, zoom-lens system is made up of following four lens combination from the thing side:
First lens combination with positive refraction focal power;
Second lens combination with negative refraction focal power;
The 3rd lens combination with positive refraction focal power; With
The 4th lens combination with positive refraction focal power,
Wherein when the location status of lens combination when wide-angle end becomes telephoto end, distance between first lens combination and second lens combination changes, distance between second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes, and the 4th lens combination moves along the zoom track that has towards as the protrusion shape of side.
By below with reference to the accompanying drawing detailed description of the preferred embodiment, other characteristics of the present invention and advantage will become more clear.
Description of drawings
Fig. 1 represents the lens strength distribution of the zoom-lens system of each example according to the present invention and moving of each lens combination;
Fig. 2 represents that the lens of the zoom-lens system of example 1 according to the present invention distribute, and wherein (W) is wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end;
Fig. 3 A and 3B are the various aberration curves of expression zoom-lens system of example 1 according to the present invention, and wherein Fig. 3 A represents the various aberration curves of wide-angle end, and Fig. 3 B represents the various aberration curves of the first medium focal length state M1;
Fig. 4 A and 4B are the various aberration curves of expression zoom-lens system of example 1 according to the present invention, and wherein Fig. 4 A represents the various aberration curves of the second medium focal length state M2, and Fig. 4 B represents the various aberration curves of telephoto end T;
Fig. 5 is that the lens of expression zoom-lens system of example 2 according to the present invention distribute, and wherein (W) is wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end;
Fig. 6 A and 6B are the various aberration curves of expression zoom-lens system of example 2 according to the present invention, and wherein Fig. 6 A represents the various aberration curves of wide-angle end, and Fig. 6 B represents the various aberration curves of the first medium focal length state M1;
Fig. 7 A and 7B are the various aberration curves of expression zoom-lens system of example 2 according to the present invention, and wherein Fig. 7 A represents the various aberration curves of the second medium focal length state M2, and Fig. 7 B represents the various aberration curves of telephoto end T;
Fig. 8 is that the lens of expression zoom-lens system of example 3 according to the present invention distribute, and wherein (W) is wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end;
Fig. 9 A and 9B are the various aberration curves of expression zoom-lens system of example 3 according to the present invention, and wherein Fig. 9 A represents the various aberration curves of wide-angle end, and Fig. 9 B represents the various aberration curves of the first medium focal length state M1;
Figure 10 A and 10B are the various aberration curves of expression zoom-lens system of example 3 according to the present invention, and wherein Figure 10 A represents the various aberration curves of the second medium focal length state M2, and Figure 10 B represents the various aberration curves of telephoto end T.
Embodiment
Below with reference to accompanying drawing embodiments of the invention are described.
According to zoom-lens system of the present invention, comprise first lens combination from the thing side with positive refraction focal power, have second lens combination of negative refraction focal power, have the 3rd lens combination and the 4th lens combination of positive refraction focal power with positive refraction focal power.Thing side in the 3rd lens combination is provided with an aperture diaphragm.When the location status of lens combination when wide-angle end becomes telephoto end, the first, second, third and the 4th lens combination moves along optical axis, and the 4th lens combination is at first to the picture side shifting, again from about medium focal length state to the thing side shifting, form zoom track with the protrusion shape that faces the picture side.
In the routine four lens combination zoom-lens systems with the 4th fixing lens combination, total length of lens increases along with the increase of zoom ratio.When lens diameter or total length of lens were implemented restriction, the optical property of zoom-lens system descended.
On the other hand, in zoom-lens system according to the present invention, when the location status of lens combination when wide-angle end becomes telephoto end, by moving the 4th lens combination with the convex track that faces as side, can reduce the total length of lens and the lens diameter of the front lens of zoom-lens system sharp, so that can realize the high zoom ratios that the lens barrel of zoom-lens system dwindles and guarantees the good optical performance.
In zoom-lens system according to the present invention, preferred first lens combination is being shifted to the thing side during to the telephoto end zoom from wide-angle end.
When zoom ratio uprised, the visual angle increased to the variation of telephoto end from wide-angle end, so that identical and first lens combination is fixedly the time when total length of lens, the change of the lens diameter of front lens greatly when guaranteeing the visual angle of wide-angle end.Therefore, be difficult to make that system dwindles.
On the other hand, in zoom-lens system according to the present invention, by first lens combination can be moved and total length of lens variable, can make the lens barrel of zoom-lens system do small and exquisitely.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (1):
0.003<(Δ4a+Δ4b)/TLt<0.1 (1)
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, and TLt is illustrated in total length of lens of zoom-lens system in the telephoto end.By the way, total length of lens thing side of representing first lens combination between the picture plane along the distance of optical axis.
Conditional expression (1) defines the proper range of the 4th lens combination along the ratio of total length of lens of zoom-lens system in the amount of movement of optical axis and the telephoto end.Prescribe a time limit when (Δ 4a+ Δ 4b)/TLt ratio is equal to or less than the following of conditional expression (1), total length of lens becomes big, so that can not realize the small and exquisite of lens barrel.On the other hand, when (Δ 4a+ Δ 4b)/TLt ratio equals or exceeds going up in limited time of conditional expression (1), the 4th lens combination is big along the mobile quantitative change of optical axis, and can not keep the small and exquisite of total length of lens, so that can not realize the small and exquisite of lens barrel except influencing zoom rate.In order to ensure effect of the present invention, preferably the lower limit with conditional expression (1) is arranged on 0.006, and the upper limit is arranged on 0.07.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (2):
0.003<Δ4a/(fT-fW)<0.1 (2)
Herein, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
Conditional expression (2) defines the 4th lens combination when focusing on infinity is positioned at the focal length state of the most close picture side position to the 4th lens combination along optical axis from wide-angle end the proper range of amount of movement.Prescribe a time limit when ratios delta 4a/ (fT-fW) is equal to or less than the following of conditional expression (2), the optical property of medium focal length state descends.On the other hand, prescribe a time limit when ratios delta 4a/ (fT-fW) equals or exceeds going up of conditional expression (2), the 4th lens combination is big along the mobile quantitative change of optical axis, so that do not select to make up this lens barrel.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (2) is set to 0.005, and the upper limit is set to 0.07.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (3):
0.003<Δ4b/(fT-fW)<0.1 (3)
Conditional expression (3) defines that the 4th lens combination is positioned at the proper range of the focal length state of the most close picture side position to the amount of movement of telephoto end when focusing on infinity along optical axis from the 4th lens combination.Prescribe a time limit when ratios delta 4b/ (fT-fW) is equal to or less than the following of conditional expression (3), the optical property of medium focal length state and telephoto end descends.On the other hand, prescribe a time limit when ratios delta 4b/ (fT-fW) equals or exceeds going up of conditional expression (3), the 4th lens combination is big along the mobile quantitative change of optical axis, so that do not select to make up this lens barrel.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (3) is set to 0.005, and the upper limit is set to 0.07.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (4):
0.005<M·(Δ4a+Δ4b)/f4<2 (4)
Herein, f4 represents the focal length of the 4th lens combination, and M represents the zoom ratio of zoom-lens system.
Conditional expression (4) defines the amount of movement of the 4th lens combination along optical axis by the focal length and the zoom ratio of the 4th lens combination.When ratio M (Δ 4a+ Δ 4b)/f4 be equal to or less than conditional expression (4) following in limited time, be difficult to guarantee the optical property in the whole zooming range from the wide-angle end to the telephoto end, and can not realize high zoom ratio.On the other hand, prescribe a time limit when ratio M (Δ 4a+ Δ 4b)/f4 equals or exceeds going up of conditional expression (4), the 4th lens combination is big along the mobile quantitative change of optical axis, so that preferably do not make up this kind lens barrel.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (4) is set to 0.1, and the upper limit is set to 1.4.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (5):
0.5<fM/(fW·fT)
1/2<1.4 (5)
Focal length when herein, fM represents that the 4th lens combination is positioned at the most close picture side position.
Conditional expression (5) defines the proper range that the 4th lens combination is positioned at the focal length state of the most close picture side position.As ratio fM/ (fWfT)
1/2Be equal to or less than the following of conditional expression (5) and prescribe a time limit, the spherical aberration of medium focal length state and astigmatism variation are so that can not guarantee the optical property that whole zooming range is interior.On the other hand, as ratio fM/ (fWfT)
1/2Equal or exceed going up in limited time of conditional expression (5), can not realize high zoom ratio.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (5) is set to 0.6, and the upper limit is set to 1.2.
In zoom-lens system according to the present invention, preferably satisfy following conditional expression (6):
0.3<Δ4b/Δ4a<3.0 (6)
Conditional expression (6) defines the 4th lens combination when focusing on infinity and is positioned at as the amount of movement of the focal length state of side and the 4th lens combination along optical axis from being positioned at as the focal length state of the side ratio to the amount of movement of telephoto end to the 4th lens combination along optical axis from wide-angle end.Prescribe a time limit when ratios delta 4b/ Δ 4a is equal to or less than the lower limit of conditional expression (6) or surpasses going up of conditional expression (6), total length of lens becomes big, so that can not realize the small and exquisite of lens barrel.In order to ensure effect of the present invention, preferably the lower limit of conditional expression (6) is set to 0.6, and the upper limit is set to 1.5.
In zoom-lens system according to the present invention, from infinity to the focusing of nearly thing by carrying out to thing side shifting the 4th lens combination.By the way, can focus on by moving first lens combination, second lens combination or the 4th lens combination.Perhaps can focus on by extending whole lens combination on the whole.Perhaps can focus on as the plane by moving.In lens barrel structure, be more convenient for focusing on by moving the 4th lens combination.
[embodiment]
Explain example below with reference to the accompanying drawings according to zoom-lens system of the present invention.
Fig. 1 represents the lens strength distribution of the zoom-lens system of each example according to the present invention and moving of each lens combination.
In Fig. 1, the zoom-lens system of each example comprises the first lens combination G1 with positive refraction focal power from the thing side according to the present invention, the second lens combination G2 with negative refraction focal power has the 3rd lens combination G3 of positive refraction focal power and the 4th lens combination G4 with positive refraction focal power.When the location status of lens combination from wide-angle end W when telephoto end T changes, distance between the first lens combination G1 and the second lens combination G2 increases, distance between the second lens combination G2 and the 3rd lens combination G3 reduces, variable in distance between the 3rd lens combination G3 and the 4th lens combination G4, the 4th lens combination G4 moves to have the convex track that faces as planar I.
＜example 1 〉
Fig. 2 represents that the lens of the zoom-lens system of example 1 according to the present invention distribute, and wherein (W) is wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end.A sketch to wide-angle end (W) has marked the label of representing each lens element among the figure, has saved the mark to other sketch.Other example is adopted same rule.
The zoom-lens system of example 1 is made up of these assemblies from the thing side according to the present invention: the first lens combination G1 with positive refraction focal power, the second lens combination G2 with negative refraction focal power, aperture diaphragm S has the 3rd lens combination G3 of positive refraction focal power and the 4th lens combination G4 with positive refraction focal power.
The first lens combination G1 with positive refraction focal power is made up of these elements from the thing side is whole: glue together the balsaming lens that forms by convex surface towards the diverging meniscus lens L11 and the biconvex positive lens L12 of thing side, and convex surface is towards the positive meniscus lens L13 of thing side.
The second lens combination G2 with negative refraction focal power is made up of these elements from the thing side is whole: convex surface is towards the diverging meniscus lens L21 of thing side, double-concave negative lens L22 and biconvex positive lens L23.
The 3rd lens combination G3 with positive refraction focal power is made up of these elements from the thing side is whole: biconvex positive lens L31, glue together balsaming lens and the biconvex positive lens L34 that forms by biconvex positive lens L32 and double-concave negative lens L33.
The 4th lens combination is made up of biconvex positive lens L41.
Aperture diaphragm S is arranged on the thing side of the 3rd lens combination G3, moves with the 3rd lens combination G3 is whole.In comprising the following example of example 1, be used for solid state image pickup device D, as in being arranged on as the resolution limiting of the CCD of planar I by the low-pass filter P1 of spatial frequency be used to protect the cover glass P2 of solid state image pickup device D to be arranged between the 4th lens combination G4 and the picture planar I.
Various values according to example 1 have been shown in table 1.In [index] hurdle, f represents focal length, and Bf represents back focal length, and FNO represents the f number, and 2 ω represent visual angle (unit: degree).In [lens data] hurdle, first tabulation shows that r represents radius-of-curvature from the surperficial number of thing side lens surface, and d represents the distance between the lens surface, v is illustrated in the d line, and (Abbe number of λ=587.6nm) locate, n are illustrated in the d line (refractive index of λ=587.56nm) locate.By the way, r=∞ represents plane surface.Save refractive index=1.000000 of air.In [aspherical surface data] hurdle, showed each asphericity coefficient, aspheric surface is represented by following expression formula:
X(y)＝y
2/[r·{1+(1-ky
2/r
2)
1/2}]+C4·y
4+C6·y
6+C8·y
8+C10·y
10
Y represents the height apart from optical axis herein, and the section of X (y) expression along optical axis from the aspheric surface summit is to the aspheric distance of height y, and r represents benchmark radius-of-curvature (paraxial radius-of-curvature), and k represents conical surface coefficient, and Ci represents I rank asphericity coefficient.Aspheric surface is represented by surperficial number band asterisk (*).In [aspherical surface data] hurdle, " E-n " expression " 10
-n".In [index] and [variable range] hurdle, show the focal distance f of wide-angle end W, the first medium focal length state M1, the second medium focal length state M2 and telephoto end T respectively, back focal length Bf, f count FNO and visual angle 2 ω or variable range.In [value of conditional expression] hurdle, show value corresponding to each conditional expression.
In the tabulation of different value, " mm " is common to the unit of length, as the interval between focal length, radius-of-curvature and the optical surface.But,,, also can use any other suitable unit so unit needn't be defined as " mm " because direct proportion amplifies or the optical system of minification can obtain similar optical property.It is identical that label in other example is explained.
Table 1
[index]
W M1 M2 T
f＝ 6.3 19 30 47.9
Bf=0.69473 (constant)
FNO＝ 2.6 3.35 3.97 5.09
2ω＝ 61.28° 20.16° 13.1° 8.38°
[lens data]
r d v n
1 50.7928 0.8 23.78 1.84666
2 29.1817 3.2 65.47 1.603
3 -99.7222 0.1
4 27.5451 1.5 52.32 1.755
5 46.2007 (d5)
6 1540.7477 0.8 54.66 1.72916
7 6.173 2.5
8 -13.4291 0.8 52.32 1.755
9 44.8085 0.5709
10 16.6858 1.4 23.78 1.84666
11 -109.8483 (d11)
12 ∞, 0.4 aperture diaphragm S
13
* 10.3942 1.6 61.3 1.58913
14 -36.1395 0.1
15 5.0319 2.8 81.61 1.497
16 -14777.27 0.8 34.96 1.801
17 4.3296 0.8
18
* 11.9583 1.3 81.61 1.497
19 -63.0093 (d19)
20 45 1.5 55.52 1.6968
21 -23.7314 (d21)
22 ∞ 2.62 64.14 1.51633
23 ∞ 1
24 ∞ 0.75 64.14 1.51633
25 ∞ (Bf)
[aspherical surface data]
Surface several 13
κ＝ 0.3146
C4＝ 1.00000E-10
C6＝ 2.45500E-07
C8＝ 1.00000E-14
C10＝ 2.80780E-09
Surface several 18
κ＝ -2.4380
C4＝ -3.28540E-04
C6＝ 1.00000E-12
C8＝ -3.36790E-06
C10＝ 1.00000E-16
[variable range]
W M1 M2 T
f 6.3000 19.0000 30.0000 47.9000
d5 1.2792 14.1146 16.3701 17.6261
d11 15.0028 7.0057 3.4784 0.5110
d19 6.0133 11.1419 15.2478 22.7085
d21 0.9257 0.6354 0.8620 0.9257
[value of conditional expression]
(1)：(Δ4a+Δ4b)/TLt＝ 0.009
(2)：Δ4a/(fT-fW)＝ 0.007
(3)：Δ4b/(fT-fW)＝ 0.007
(4)：M(Δ4a+Δ4b)/f4＝ 0.196
(5)：fM/(fW·fT)
1/2＝ 1.094
(6)：Δ4b/Δ4a＝ 0.916
Fig. 3 A～4B is the various aberration curves of expression zoom-lens system of example 1 according to the present invention, wherein Fig. 3 A represents the various aberrations of wide-angle end W, Fig. 3 B represents the various aberration curves of the first medium focal length state, Fig. 4 A represents the various aberration curves of the second medium focal length state M2, and F4B represents the various aberration curves of telephoto end T.
In each bar curve, FNO represents the f number, and Y represents image height, C represents the C line (aberration curve of λ=656.3nm) locate, d represents that (aberration curve of λ=587.6nm) locate, F represent that (aberration curve of λ=486.1nm) locate, g are represented the g line (aberration curve of λ=435.8nm) locate to the F line to the d line.In the curve of expression spherical aberration, the f numerical table shows the value at place, maximum diameter of hole, and solid line is represented spherical aberration, and dotted line is represented sinusoidal attitude.In the curve of expression astigmatism and distortion, Y represents the maximal value of image height.In the curve of expression coma, Y represents the value of each image height.In the curve of expression astigmatism, solid line represents that dotted line is represented fore-and-aft plane radially as the plane.Above-mentioned explanation about each bar aberration curve is identical with other example.
From each bar curve, be clear that,, shown fabulous optical property according to the zoom-lens system of example 1 as the result who has proofreaied and correct various aberrations in each focal length state from the wide-angle end to the telephoto end well.
＜example 2 〉
Fig. 5 is that the lens of expression zoom-lens system of example 2 according to the present invention distribute, and wherein (W) is wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end.
In Fig. 5, the zoom-lens system of example 2 is made up of these elements from the thing side according to the present invention: the first lens combination G1 with positive refraction focal power, the second lens combination G2 with negative refraction focal power, aperture diaphragm S has the 3rd lens combination G3 of positive refraction focal power and the 4th lens combination G4 with positive refraction focal power.
The first lens combination G1 with positive refraction focal power entirely is made up of these elements from the thing side: balsaming lens that is formed towards the diverging meniscus lens L11 of thing side and biconvex positive lens L12 gummed by convex surface and convex surface are towards the positive meniscus lens L13 of thing side.
The second lens combination G2 with negative refraction focal power entirely is made up of double-concave negative lens L21, double-concave negative lens L22 and biconvex positive lens L23 from the thing side.
The balsaming lens that the 3rd lens combination G3 with positive refraction focal power entirely forms by biconvex positive lens L31, by biconvex positive lens L32 and double-concave negative lens L33 gummed from the thing side, and biconvex positive lens L34 forms.
The 4th lens combination G4 is made up of biconvex positive lens L41.
Aperture diaphragm S is arranged on the thing side of the 3rd lens combination G3, moves with the 3rd lens combination G3.
Various values according to example 2 are suitable for table 2.
Table 2
[index]
W M1 M2 T
f＝ 6.3 11.98 26.88 48
Bf＝ 0.61 0.59 0.578 0.588
FNO＝ 2.77 3.41 3.97 4.62
2ω＝ 64.04° 33.27° 15.12° 8.66°
[lens data]
r d v n
1 34.1194 0.95 27.51 1.7552
2 21.333 4 81.61 1.497
3 -84.5256 0.1
4 27.3623 1.4 46.58 1.804
5 39.1831 (d5)
6 -198.4493 0.8 46.63 1.816
7 6.0301 2.3
8 -17.2496 0.8 54.66 1.72916
9 23.9597 0.1
10 12.3105 1.7 23.78 1.84666
11 -133.3487 (d11)
12 ∞, 0.4 aperture diaphragm S
13
* 6.171 2.5 63.4 1.51606
14
* -17.8808 0.1
15 6.6043 2.4 81.61 1.497
16 -12.2878 0.8 34.96 1.801
17 4.4511 0.8
18 16.55 1.3 43.69 1.72
19 -107.2453 (d19)
20 65.8729 1.8 42.72 1.83481
21 -33.8068 (d21)
22 ∞ 1.65 64.14 1.51633
23 ∞ 0.4
24 ∞ 0.5 64.14 1.51633
25 (Bf)
[aspherical surface data]
Surface several 13
κ＝ 0.3524
C4＝ 1.00000E-10
C6＝ 1.89790E-06
C8＝ -3.88810E-08
C10＝ 1.00000E-16
Surface several 14
κ＝ -5.3055
C4＝ 1.00000E-10
C6＝ 2.22080E-06
C8＝ -1.37750E-07
C10＝ 1.00000E-16
[variable range]
W M1 M2 T
f 6.3018 11.9795 26.8764 48.0147
d5 1.4040 8.5770 17.0200 20.4410
d11 15.3660 10.8010 5.6710 1.5920
d19 4.8830 9.5350 12.4690 15.9910
d21 2.5593 1.1192 1.6840 2.4411
[value of conditional expression]
(1)：(Δ4a+Δ4b)/TLt＝ 0.041
(2)：Δ4a/(fT-fW)＝ 0.034
(3)：Δ4b/(fT-fW)＝ 0.031
(4)：M(Δ4a+Δ4b)/f4＝ 0.765
(5)：fM/(fW·fT)
1/2＝ 0.689
(6)：Δ4b/Δ4a＝ 1.000
Fig. 6 A～7B is the curve of expression various aberrations of zoom-lens system of example 2 according to the present invention, wherein Fig. 6 A represents the various aberration curves of wide-angle end W, Fig. 6 B represents the various aberration curves of the first medium focal length state M1, Fig. 7 A represents the various aberration curves of the second medium focal length state M2, and Fig. 7 B represents the various aberration curves of telephoto end T.
From each bar curve, be clear that,, shown fabulous optical property according to the zoom-lens system of example 2 as the result who has proofreaied and correct various aberrations in each focal length state from the wide-angle end to the telephoto end well.
＜example 3 〉
Fig. 8 is that the lens of expression zoom-lens system of example 3 according to the present invention distribute, wherein
(W) being wide-angle end, (M1) is the first medium focal length state, (M2) is the second medium focal length state, (T) is telephoto end.
In Fig. 8, the zoom-lens system of example 3 is made up of the first lens combination G1 with positive refraction focal power, the second lens combination G2, aperture diaphragm S with negative refraction focal power, the 4th lens combination G4 that has the 3rd lens combination G3 of positive refraction focal power and have a positive refraction focal power from the thing side according to the present invention.
The first lens combination G1 with positive refraction focal power entirely is made up of towards the positive meniscus lens L13 of thing side towards balsaming lens, convex surface that the diverging meniscus lens L11 and the biconvex positive lens L12 gummed of thing side forms convex surface from the thing side.
The second lens combination G2 with negative refraction focal power entirely is made up of double-concave negative lens L21, double-concave negative lens L22 and biconvex positive lens L23 from the thing side.
The 3rd lens combination G3 with positive refraction focal power forms towards the positive meniscus lens L34 of thing side from balsaming lens and convex surface that the thing side entirely forms by biconvex positive lens L31, by biconvex positive lens L32 and double-concave negative lens L33 gummed.
The 4th lens combination G4 is made up of biconvex positive lens L41.
Aperture diaphragm S is arranged on the thing side of the 3rd lens combination G3, moves with the 3rd lens combination G3.
Various numerical value according to example 3 are suitable for table 3.
Table 3
[index]
W M1 M2 T
f＝ 7.5 22.22 37.5 66.53
Bf=1.63127 (constant)
FNO＝ 2.61 3.54 3.81 4.84
2ω＝ 67.83° 23.14° 13.84° 7.95°
[lens data]
r d v n
1 45.2848 1 23.78 1.84666
2 31.9444 6.3 81.61 1.497
3 -134.5167 0.1
4 31.8511 1.9 47.82 1.757
5 43.7941 (d5)
6 -1314.022 1 46.63 1.816
7 8.3694 3.19
8 -20.07 1 52.32 1.755
9 61.8785 0.15
10 19.536 2.2 23.78 1.84666
11 -102.5759 (d11)
12 ∞, 0.5 aperture diaphragm S
13
* 8.3333 3.2 61.3 1.58913
14
* -32.4601 0.1
15 14.7517 3.5 65.47 1.603
16 -12.7614 1.1 34.96 1.801
17 6.0825 1
18 13.3827 1.8056 48.31 1.66672
19 104.4609 (d19)
20 83.3333 2.2222 54.66 1.72916
21 -35.958 (d21)
22 ∞ 2 64.14 1.51633
23 ∞ 0.5
24 ∞ 0.5 64.14 1.51633
25 ∞ (Bf)
[aspherical surface data]
Surface several 13
κ＝ 0.3036
C4＝ 3.73250E-11
C6＝ 1.15480E-06
C8＝ -4.03990E-09
C10＝ 5.19990E-18
Surface several 14
κ＝ -10.8985
C4＝ 3.73250E-11
C6＝ 1.42300E-06
C8＝ -2.18410E-08
C10＝ 5.19990E-18
[variable range]
W M1 M2 T
f 7.5000 22.2222 37.5000 66.5278
d5 1.7063 16.8330 23.8501 26.6560
d11 26.2279 13.0031 7.8690 1.6326
d19 6.3952 14.5234 16.1915 23.6761
d21 2.0482 0.4746 1.3436 2.1096
[value of conditional expression]
(1)：(Δ4a+Δ4b)/TLt＝ 0.036
(2)：Δ4a/(fT-fW)＝ 0.027
(3)：Δ4b/(fT-fW)＝ 0.028
(4)：M(Δ4a+Δ4b)/f4＝ 0.820
(5)：fM/(fW·fT)
1/2＝ 0.995
(6)：Δ4b/Δ4a＝ 1.039
Fig. 9 A～10B is the various aberration curves of expression zoom-lens system of example 3 according to the present invention, wherein Fig. 9 A represents the various aberration curves of wide-angle end W, Fig. 9 B represents the various aberration curves of the first medium focal length state M1, Figure 10 A represents the various aberration curves of the second medium focal length state M2, and Figure 10 B represents the various aberration curves of telephoto end T.
From each bar curve, be clear that,, shown fabulous optical property according to the zoom-lens system of example 3 as the result who has proofreaied and correct various aberrations in each focal length state from the wide-angle end to the telephoto end well.
By the way, need not to give unnecessary details, though the present invention is that example is illustrated with the zoom-lens system of four lens group structures, the simple zoom-lens system that adds lens combination is also contained in the spirit of the present invention in four lens combination.And in the structure of each lens combination, the simple lens combination that adds lens element is also contained among the spirit and scope of the present invention in the lens combination shown in the example.
Other advantage of the present invention and remodeling are easy to realize for a person skilled in the art.Therefore, the invention is not restricted to details particularly and in the representative device of this displaying and description.Therefore, can do various remodeling to the present invention not breaking away under the prerequisite of the present invention by claim and equivalent restricted portion thereof.
Claims (22)
1. zoom-lens system, form by following four lens combination from the thing side:
First lens combination with positive refraction focal power;
Second lens combination with negative refraction focal power;
The 3rd lens combination with positive refraction focal power; With
The 4th lens combination with positive refraction focal power,
Wherein when the location status of lens combination when wide-angle end becomes telephoto end, distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination changes, and the 4th lens combination moves along the zoom track that has towards as the protrusion shape of side.
2. zoom-lens system as claimed in claim 1, it is characterized in that when the location status of lens combination when wide-angle end becomes telephoto end, first lens combination is to the thing side shifting.
3. zoom-lens system as claimed in claim 2 is characterized in that satisfying following conditional expression:
0.003<(Δ4a+Δ4b)/TLt<0.1
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, be positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end along optical axis from the 4th lens combination when Δ 4b represents that the 4th lens combination focuses on infinity, TLt is illustrated in total length of lens of zoom-lens system in the telephoto end.
4. zoom-lens system as claimed in claim 3 is characterized in that satisfying following conditional expression:
0.003<Δ4a/(fT-fW)<0.1
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
5. zoom-lens system as claimed in claim 4 is characterized in that satisfying following conditional expression:
0.003<Δ4b/(fT-fW)<0.1
Herein, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
6. zoom-lens system as claimed in claim 5 is characterized in that satisfying following conditional expression:
0.005<M·(Δ4a+Δ4b)/f4<2
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, f4 represents the focal length of the 4th lens combination, and M represents the zoom ratio of zoom-lens system.
7. zoom-lens system as claimed in claim 3 is characterized in that satisfying following conditional expression:
0.003<Δ4b/(fT-fW)<0.1
Herein, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
8. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.003<(Δ4a+Δ4b)/TLt<0.1
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, and TLt is illustrated in total length of lens of zoom-lens system in the telephoto end.
9. zoom-lens system as claimed in claim 8 is characterized in that satisfying following conditional expression:
0.003<Δ4a/(fT-fW)<0.1
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
10. zoom-lens system as claimed in claim 8 is characterized in that satisfying following conditional expression:
0.003<Δ4b/(fT-fW)<0.1
Herein, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
11. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.003<Δ4a/(fT-fW)<0.1
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
12. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.003<Δ4b/(fT-fW)<0.1
Herein, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, fT represents the focal length of zoom-lens system in the telephoto end, and fW represents the focal length of zoom-lens system in the wide-angle end.
13. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.005<M·(Δ4a+Δ4b)/f4<2
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination, f4 represents the focal length of the 4th lens combination, and M represents the zoom ratio of zoom-lens system.
14. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.5<fM/(fW·fT)
1/2<1.4
Herein, the focal length when fM represents that the 4th lens combination is positioned at the most close picture side position, fW represents the focal length of zoom-lens system in the wide-angle end, fT represents the focal length of zoom-lens system in the telephoto end.
15. zoom-lens system as claimed in claim 1 is characterized in that satisfying following conditional expression:
0.3<Δ4b/Δ4a<3.0
Herein, Δ 4a represent the 4th lens combination along optical axis from wide-angle end the absolute value to the focal length state amount of movement, at focal length state, the 4th lens combination is positioned at the position of the most close picture side when focusing on infinity, and the 4th lens combination was positioned at the absolute value of the focal length state of the most close picture side position to the amount of movement of telephoto end when Δ 4b represented to focus on infinity along optical axis from the 4th lens combination.
16. a zoom-lens system is made up of following four lens combination from the thing side:
First lens combination with positive refraction focal power;
Second lens combination with negative refraction focal power;
The 3rd lens combination with positive refraction focal power; With
The 4th lens combination with positive refraction focal power,
Wherein when the location status of lens combination when wide-angle end becomes telephoto end, distance between first lens combination and second lens combination changes, distance between second lens combination and the 3rd lens combination changes, and the distance between the 3rd lens combination and the 4th lens combination changes, and the 4th lens combination moves along the zoom track that has towards as the protrusion shape of side.
17. zoom-lens system as claimed in claim 1 is characterized in that described zoom-lens system comprises at least one non-spherical lens.
18. zoom-lens system as claimed in claim 1 is characterized in that described the 3rd lens combination comprises non-spherical lens.
19. zoom-lens system as claimed in claim 18 also comprises the aperture diaphragm of the non-spherical lens in the 3rd lens combination.
20. zoom-lens system as claimed in claim 1 is characterized in that described zoom-lens system focuses on by move the 4th lens combination along optical axis.
21. zoom-lens system as claimed in claim 1 is characterized in that described the 4th lens combination is made up of lens.
22. zoom-lens system as claimed in claim 1 also comprises the low-pass filter between the 4th lens combination and picture side.
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|---|---|---|---|
| JP2004268952 | 2004-09-15 | ||
| JP2004268952 | 2004-09-15 | ||
| JP2005259575 | 2005-09-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009009104A (en) * | 2007-05-29 | 2009-01-15 | Nikon Corp | Zoom lens and optical apparatus |
| CN102645734B (en) * | 2009-04-24 | 2014-10-15 | 株式会社理光 | Zoom lens unit, imaging apparatus and portable information terminal apparatus |
| EP2244117B1 (en) * | 2009-04-24 | 2017-05-31 | Ricoh Company, Ltd. | Zoom lens unit |
| CN101923206B (en) * | 2009-06-10 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Zoom lens |
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