JP4669294B2 - Zoom lens and imaging apparatus having the same - Google Patents
Zoom lens and imaging apparatus having the same Download PDFInfo
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- JP4669294B2 JP4669294B2 JP2005022561A JP2005022561A JP4669294B2 JP 4669294 B2 JP4669294 B2 JP 4669294B2 JP 2005022561 A JP2005022561 A JP 2005022561A JP 2005022561 A JP2005022561 A JP 2005022561A JP 4669294 B2 JP4669294 B2 JP 4669294B2
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
Description
1.7<Δ2X/√|f1・f2|<2.3
0.5<D23w/fw<1.2
1.88<n1a
なる条件を満足することを特徴としている。 The zoom lens of the present invention includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having positive refractive power, hand during zooming in the zoom lens the distance of each lens group is changed, the wide-angle end from Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the distance between the third lens group and the second lens group at the wide-angle end d23w, the first lens group and the focal length of the second lens group respectively f1, f2, the focal length of the entire system at the wide angle end fw, the average of the refractive index of the material of the lenses constituting the first lens group When the value is n1a ,
1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5 <D23w / fw <1.2
1.88 <n1a
It is characterized by satisfying the following conditions.
1.7<Δ2X/√|f1・f2|<2.3
1.88<n1a
なる条件を満足することを特徴としている。 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. in the zoom lens hand spacing of each lens group is changed upon zooming, the first lens group consists of two lenses, Deruta2X the amount of movement of the second lens group during zooming to the telephoto end from the wide angle end, the first each one lens group is a focal length of the second lens group f1, f2, when an average value of the refractive index of the material of the lenses constituting the first lens group and n1a,
1.7 <Δ2X / √ | f1 · f2 | <2.3
1.88 <n1a
It is characterized by satisfying the following conditions.
1.7<Δ2X/√|f1・f2|<2.3
0.5<D23w/fw<1.2
1.85<n2b
なる条件を満足することを特徴としている。 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. in the zoom lens hand spacing of each lens group is changed upon zooming, Deruta2X the amount of movement of the second lens group during zooming from the wide-angle end to the telephoto end, and the second lens group at the wide-angle end and the third lens group D23w spacing, the first lens group and the focal length of the second lens group respectively f1, f2, the focal length of the entire system at the wide angle end fw, the material of the negative lens constituting the second lens group When the refractive index is n2b ,
1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5 <D23w / fw <1.2
1.85 <n2b
It is characterized by satisfying the following conditions.
1.7<Δ2X/√|f1・f2|<2.3
1.85<n2b
なる条件を満足することを特徴としている。 In addition, the zoom lens of the present invention includes, in order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. in the zoom lens hand spacing of each lens group is changed upon zooming, the first lens group consists of two lenses, Deruta2X the amount of movement of the second lens group during zooming to the telephoto end from the wide angle end, the first each one lens group is a focal length of the second lens group f1, f2, when the refractive index of the material of the negative lens constituting the second lens group and n2b,
1.7 <Δ2X / √ | f1 · f2 | <2.3
1.85 <n2b
It is characterized by satisfying the following conditions.
とで、正レンズG21と正レンズG22で発生した収差をキャンセルさせている。 And the aberration which generate | occur | produced with the positive lens G21 and the positive lens G22 is canceled by making the image side surface of the negative lens G23 cemented with the positive lens G22 into a concave shape.
sk’=f3(1−β3)
の関係が成り立っている。 Here, when the back focus is sk ′, the focal length of the third lens unit L3 is f3, and the imaging magnification of the third lens unit L3 is β3,
sk ′ = f3 (1-β3)
The relationship is established.
0<β3<1.0
である。 However,
0 <β3 <1.0
It is.
3.8<(β2t・β3w)/(β2w・β3t)>5.2・・・・(3)
1.88<n1a・・・・(4)
1.85<n2b・・・・(5)
1.9<f3/f2<2.5・・・・(6)
5.2<f3/fw<6.4・・・・(7)
なる条件を満足している。 0.5 < D23w / fw < 1.2 (2)
3.8 <(β2t · β3 w ) / (β2 w · β3t)> 5.2 (3)
1.88 <n1a (4)
1.85 <n2b (5)
1.9 <f3 / f2 <2.5 (6)
5.2 <f3 / fw <6.4 (7)
Is satisfied.
3.9<(β2t・β3w)/(β2w・β3t)<5.1・・・・(3a)
1.90<n1a・・・・(4a)
1.90<n2b・・・・(5a)
2.0<f3/f2<2.4・・・・(6a)
5.3<f3/fw<6.35・・・・(7a)
なる条件を満足することである。 0.6 <D23 w /fw<1.1 (2a)
3.9 <(β2 t · β3 w ) / (β2 w · β3 t ) <5.1 (3a)
1.90 <n1a (4a)
1.90 <n2b (5a)
2.0 <f3 / f2 <2.4 (6a)
5.3 <f3 / f w <6.35 ···· (7a)
To satisfy the following conditions.
りに、各レンズ群の間隔が変化するように2つのレンズ群(例えば第1と第2レンズ群、
又は第1と第3レンズ群又は第2と第3レンズ群)を移動させるズームタイプにも適用で
きる。 In each of the above embodiments, instead of moving the three lens groups during zooming, the two lens groups (for example, the first and second lens groups,
Alternatively, the present invention can also be applied to a zoom type in which the first and third lens groups or the second and third lens groups) are moved.
ンズ群を付加しても本発明で得られる効果には変わりがない。 Further, even if a lens unit having a small refractive power is added to the object side of the first lens unit L1 and / or the image side of the third lens unit L3, the effect obtained by the present invention remains unchanged.
を示し、Riはレンズ面の曲率半径、Diは第i面と第(i+1)面との間の間隔、Ni
,νiはそれぞれd線を基準とした屈折率、アッベ数を示す。 Next, numerical examples of the present invention will be shown. In each numerical example, i indicates the order of the surfaces from the object side, Ri is the radius of curvature of the lens surface, Di is the distance between the i-th surface and the (i + 1) -th surface, Ni
, Νi respectively indicate the refractive index and Abbe number with respect to the d-line.
を光軸と垂直な方向の光軸からの高さ、Rを近軸曲率半径、kを円錐定数、B〜Eを非球
面係数とするとき、
x=(h2/R)/[1+{1−(1+k)(h/R)2}1/2]
+Bh4+Ch6+Dh8+Eh10
なる式で表している。 The aspherical shape is such that the light traveling direction is positive, x is the amount of displacement from the surface vertex in the optical axis direction, h
Is the height from the optical axis in the direction perpendicular to the optical axis, R is the paraxial radius of curvature, k is the conic constant, and B to E are aspherical coefficients,
x = (h 2 / R) / [1+ {1− (1 + k) (h / R) 2 } 1/2 ]
+ Bh 4 + Ch 6 + Dh 8 + Eh 10
It is expressed by the following formula.
、ωは半画角を示す。又前述の各条件式と各数値実施例との関係を表1に示す。 “E-0X” means “× 10 −x ”. f represents a focal length, Fno represents an F number, and ω represents a half angle of view. Table 1 shows the relationship between the above-described conditional expressions and numerical examples.
数値実施例1
f=4.69〜21.60 Fno=2.56〜5.97 2ω=65.5°〜15.9°
R 1 = 28.278 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.123 D 2 = 2.84
R 3 = 9.485 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = 可変
R 5 = 絞り D 5 = 0.40
R 6 = 13.007 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 690.521 D 7 = 0.10
R 8 = 6.185 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.336 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.092 D10 = 0.81
R11 = 23.853 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.457 D12 = 可変
R13 = 18.330 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -36.938 D14 = 可変
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
焦点距離 4.69 12.90 21.60
可変間隔
D 4 20.33 5.16 1.80
D12 4.02 15.03 26.52
D14 4.33 4.08 3.36
非球面係数
R2 k=-1.57269e+00 B=9.31352e-04 C=-9.32116e-07 D=1.10249e-08
E=3.97985e-10
R8 k=-1.77870e-01 B=5.38565e-05 C=2.46566e-06
数値実施例2
f=4.50〜24.35 Fno=2.74〜7.00 2ω=67.7°〜14.1°
R 1 = 28.104 D 1 = 1.80 N 1 = 1.882997 ν1 = 40.8
R 2 = 5.326 D 2 = 2.67
R 3 = 9.520 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.301 D 4 = 可変
R 5 = 絞り D 5 = 0.20
R 6 = 10.497 D 6 = 1.50 N 3 = 1.620411 ν 3 = 60.3
R 7 = 91.154 D 7 = 0.10
R 8 = 6.413 D 8 = 2.05 N 4 = 1.788001 ν 4 = 47.4
R 9 = -27.354 D 9 = 1.50 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.137 D10 = 0.50
R11 = 24.649 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -22.165 D12 = 可変
R13 = 15.118 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = -112.010 D14 = 可変
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
焦点距離 4.50 14.14 24.35
可変間隔
D 4 23.38 5.25 1.80
D12 3.95 16.12 28.69
D14 4.25 3.96 3.25
非球面係数
R2 k=-1.31424e+00 B=6.16883e-04 C=3.16840e-06 D=1.01182e-08
E=-3.58477e-10
R8 k=-2.76663e+00 B=1.25488e-03 C=-1.10959e-05 D=3.02464e-07
数値実施例3
f=4.29〜25.30 Fno=2.50〜6.90 2ω=70.2°〜13.6°
R 1 = 33.847 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.319 D 2 = 2.49
R 3 = 9.526 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.478 D 4 = 可変
R 5 = 絞り D 5 = 0.20
R 6 = 10.394 D 6 = 1.45 N 3 = 1.639999 ν 3 = 60.1
R 7 = 62.083 D 7 = 0.10
R 8 = 6.334 D 8 = 2.10 N 4 = 1.772499 ν 4 = 49.6
R 9 = -51.827 D 9 = 1.55 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.096 D10 = 0.55
R11 = 22.577 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -21.511 D12 = 可変
R13 = 12.440 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = 110.419 D14 = 可変
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
焦点距離 4.29 14.31 25.30
可変間隔
D 4 22.31 4.94 1.78
D12 3.54 16.87 30.62
D14 4.16 3.50 2.42
非球面係数
R1 k=1.66792e+01 B=3.29890e-05 C=-3.75031e-06 D=7.54949e-08
E=-8.64945e-10
R2 k=-1.28756e+00 B=6.38450e-04 C=5.28748e-06 D=-1.07260e-07
E=7.71211e-10
R8 k=-3.00310e+00 B=1.38557e-03 C=-1.77869e-05 D=5.11304e-07
数値実施例4
f=4.69〜21.60 Fno=2.52〜5.97 2ω=65.5°〜15.9°
R 1 = 27.781 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.112 D 2 = 2.87
R 3 = 9.459 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.081 D 4 = 可変
R 5 = 絞り D 5 = 0.40
R 6 = 12.693 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 748.560 D 7 = 0.10
R 8 = 6.188 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -17.856 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.062 D10 = 0.90
R11 = 24.749 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.554 D12 = 可変
R13 = 20.052 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -32.668 D14 = 可変
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
焦点距離 4.69 17.55 21.60
可変間隔
D 4 19.84 5.11 1.80
D12 3.00 14.28 26.27
D14 4.99 4.58 3.48
非球面係数
R2 k=-1.55604e+00 B=9.15097e-04 C=-5.65375e-08 D=7.02344e-09
E=2.63734e-10
R8 k=-2.86351e-01 B=1.03856e-04 C=4.26746e-06
数値実施例5
f=4.69〜21.60 Fno=2.58〜5.97 2ω=65.5°〜15.9°
R 1 = 28.388 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.087 D 2 = 2.90
R 3 = 9.529 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = 可変
R 5 = 絞り D 5 = 0.10
R 6 = 13.199 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 554.461 D 7 = 0.10
R 8 = 6.184 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.358 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.115 D10 = 0.81
R11 = 22.733 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -16.955 D12 = 可変
R13 = 16.884 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -49.680 D14 = 可変
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
焦点距離 4.69 12.98 21.60
可変間隔
D 4 20.79 5.40 1.96
D12 5.06 15.84 26.79
D14 3.58 3.27 2.80
非球面係数
R2 k=-1.49618e+00 B=8.75196e-04 C=-3.59972e-07 D=1.41022e-08
E=3.46972e-10
R8 k=-4.33552e-01 B=1.86343e-04 C=5.39556e-06
Numerical example 1
f = 4.69-21.60 Fno = 2.56-5.97 2ω = 65.5 ° -15.9 °
R 1 = 28.278 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.123 D 2 = 2.84
R 3 = 9.485 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = Variable
R 5 = Aperture D 5 = 0.40
R 6 = 13.007 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 690.521 D 7 = 0.10
R 8 = 6.185 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.336 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.092 D10 = 0.81
R11 = 23.853 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.457 D12 = variable
R13 = 18.330 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -36.938 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
Focal length 4.69 12.90 21.60
Variable interval
D 4 20.33 5.16 1.80
D12 4.02 15.03 26.52
D14 4.33 4.08 3.36
Aspheric coefficient
R2 k = -1.57269e + 00 B = 9.31352e-04 C = -9.32116e-07 D = 1.10249e-08
E = 3.97985e-10
R8 k = -1.77870e-01 B = 5.38565e-05 C = 2.46566e-06
Numerical example 2
f = 4.50〜24.35 Fno = 2.74〜7.00 2ω = 67.7 ° 〜14.1 °
R 1 = 28.104 D 1 = 1.80 N 1 = 1.882997 ν1 = 40.8
R 2 = 5.326 D 2 = 2.67
R 3 = 9.520 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.301 D 4 = Variable
R 5 = Aperture D 5 = 0.20
R 6 = 10.497 D 6 = 1.50 N 3 = 1.620411 ν 3 = 60.3
R 7 = 91.154 D 7 = 0.10
R 8 = 6.413 D 8 = 2.05 N 4 = 1.788001 ν 4 = 47.4
R 9 = -27.354 D 9 = 1.50 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.137 D10 = 0.50
R11 = 24.649 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -22.165 D12 = variable
R13 = 15.118 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = -112.010 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
Focal length 4.50 14.14 24.35
Variable interval
D 4 23.38 5.25 1.80
D12 3.95 16.12 28.69
D14 4.25 3.96 3.25
Aspheric coefficient
R2 k = -1.31424e + 00 B = 6.16883e-04 C = 3.16840e-06 D = 1.01182e-08
E = -3.58477e-10
R8 k = -2.76663e + 00 B = 1.25488e-03 C = -1.10959e-05 D = 3.02464e-07
Numerical Example 3
f = 4.29-25.30 Fno = 2.50-6.90 2ω = 70.2 ° -13.6 °
R 1 = 33.847 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.319 D 2 = 2.49
R 3 = 9.526 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.478 D 4 = Variable
R 5 = Aperture D 5 = 0.20
R 6 = 10.394 D 6 = 1.45 N 3 = 1.639999 ν 3 = 60.1
R 7 = 62.083 D 7 = 0.10
R 8 = 6.334 D 8 = 2.10 N 4 = 1.772499 ν 4 = 49.6
R 9 = -51.827 D 9 = 1.55 N 5 = 2.003300 ν 5 = 28.3
R10 = 5.096 D10 = 0.55
R11 = 22.577 D11 = 1.20 N 6 = 1.834000 ν 6 = 37.2
R12 = -21.511 D12 = variable
R13 = 12.440 D13 = 1.60 N 7 = 1.516330 ν 7 = 64.1
R14 = 110.419 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
Focal length 4.29 14.31 25.30
Variable interval
D 4 22.31 4.94 1.78
D12 3.54 16.87 30.62
D14 4.16 3.50 2.42
Aspheric coefficient
R1 k = 1.66792e + 01 B = 3.29890e-05 C = -3.75031e-06 D = 7.54949e-08
E = -8.64945e-10
R2 k = -1.28756e + 00 B = 6.38450e-04 C = 5.28748e-06 D = -1.07260e-07
E = 7.71211e-10
R8 k = -3.00310e + 00 B = 1.38557e-03 C = -1.77869e-05 D = 5.11304e-07
Numerical Example 4
f = 4.69〜21.60 Fno = 2.52〜5.97 2ω = 65.5 ° 〜15.9 °
R 1 = 27.781 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.112 D 2 = 2.87
R 3 = 9.459 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.081 D 4 = variable
R 5 = Aperture D 5 = 0.40
R 6 = 12.693 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 748.560 D 7 = 0.10
R 8 = 6.188 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -17.856 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.062 D10 = 0.90
R11 = 24.749 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -17.554 D12 = variable
R13 = 20.052 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -32.668 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
Focal length 4.69 17.55 21.60
Variable interval
D 4 19.84 5.11 1.80
D12 3.00 14.28 26.27
D14 4.99 4.58 3.48
Aspheric coefficient
R2 k = -1.55604e + 00 B = 9.15097e-04 C = -5.65375e-08 D = 7.02344e-09
E = 2.63734e-10
R8 k = -2.86351e-01 B = 1.03856e-04 C = 4.26746e-06
Numerical Example 5
f = 4.69-21.60 Fno = 2.58-5.97 2ω = 65.5 ° -15.9 °
R 1 = 28.388 D 1 = 1.80 N 1 = 1.882997 ν 1 = 40.8
R 2 = 5.087 D 2 = 2.90
R 3 = 9.529 D 3 = 1.75 N 2 = 1.922860 ν 2 = 18.9
R 4 = 16.168 D 4 = Variable
R 5 = Aperture D 5 = 0.10
R 6 = 13.199 D 6 = 1.50 N 3 = 1.693501 ν 3 = 53.2
R 7 = 554.461 D 7 = 0.10
R 8 = 6.184 D 8 = 2.25 N 4 = 1.696797 ν 4 = 55.5
R 9 = -18.358 D 9 = 1.60 N 5 = 1.901355 ν 5 = 31.6
R10 = 5.115 D10 = 0.81
R11 = 22.733 D11 = 1.30 N 6 = 1.719995 ν 6 = 50.2
R12 = -16.955 D12 = variable
R13 = 16.884 D13 = 1.60 N 7 = 1.487490 ν 7 = 70.2
R14 = -49.680 D14 = variable
R15 = ∞ D15 = 1.00 N 8 = 1.516330 ν 8 = 64.1
R16 = ∞
Focal length 4.69 12.98 21.60
Variable interval
D 4 20.79 5.40 1.96
D12 5.06 15.84 26.79
D14 3.58 3.27 2.80
Aspheric coefficient
R2 k = -1.49618e + 00 B = 8.75196e-04 C = -3.59972e-07 D = 1.41022e-08
E = 3.46972e-10
R8 k = -4.33552e-01 B = 1.86343e-04 C = 5.39556e-06
L2 第2レンズ群
L3 第3レンズ群
SP 絞り
IP 像面
G ガラスブロック
d d線
g g線
ΔS サジタル像面
ΔM メリディオナル像面 L1 First lens group L2 Second lens group L3 Third lens group SP Aperture IP Image plane G Glass block d d line g g line ΔS Sagittal image plane ΔM Meridional image plane
Claims (17)
- 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際して各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw、前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、
1.7<Δ2X/√|f1・f2|<2.3
0.5<D23w/fw<1.2
1.88<n1a
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, Deruta2X the movement amount of the second lens group in zooming from the wide-angle end to the telephoto end, d23w the distance between the third lens group and the second lens group at the wide-angle end, the first lens group when the focal length of each of the f1 of the second lens group, f2, the focal length of the entire system at the wide angle end fw, the average value of the refractive index of the material of the lenses constituting the first lens group and n1a and,
1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5 <D23w / fw <1.2
1.88 <n1a
A zoom lens that satisfies the following conditions: - 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際して各レンズ群の間隔が変化するズームレンズにおいて、前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、
1.7<Δ2X/√|f1・f2|<2.3
1.88<n1a
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, the first lens group consists of two lenses, from the wide-angle end Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the first lens group of the second lens group When the focal lengths are f1 and f2, respectively, and the average value of the refractive index of the materials of the lenses constituting the first lens group is n1a ,
1.7 <Δ2X / √ | f1 · f2 | <2.3
1.88 <n1a
A zoom lens that satisfies the following conditions: - 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際して各レンズ群の間隔が変化するズームレンズにおいて、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、広角端における前記第2レンズ群と前記第3レンズ群との間隔をD23w、前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、広角端での全系の焦点距離をfw、前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、
1.7<Δ2X/√|f1・f2|<2.3
0.5<D23w/fw<1.2
1.85<n2b
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, Deruta2X the movement amount of the second lens group in zooming from the wide-angle end to the telephoto end, d23w the distance between the third lens group and the second lens group at the wide-angle end, the first lens group when the focal length of each of the f1 of the second lens group, f2, the focal length of the entire system at the wide angle end fw, the refractive index of the material of the negative lens constituting the second lens group and n2b and,
1.7 <Δ2X / √ | f1 · f2 | <2.3
0.5 <D23w / fw <1.2
1.85 <n2b
A zoom lens that satisfies the following conditions: - 物体側より像側へ順に、負の屈折力の第1レンズ群、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群からなり、ズーミングに際して各レンズ群の間隔が変化するズームレンズにおいて、前記第1レンズ群は2枚のレンズより成り、広角端から望遠端へのズーミングにおける前記第2レンズ群の移動量をΔ2X、前記第1レンズ群と前記第2レンズ群の焦点距離を各々f1,f2、前記第2レンズ群を構成する負レンズの材料の屈折率をn2bとするとき、
1.7<Δ2X/√|f1・f2|<2.3
1.85<n2b
なる条件を満足することを特徴とするズームレンズ。 In order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a positive third lens group refractive power, hand spacing of each lens group changes upon zooming in the zoom lens, the first lens group consists of two lenses, from the wide-angle end Δ2X the amount of movement of the second lens group during zooming to the telephoto end, the first lens group of the second lens group When the focal lengths are f1 and f2, respectively, and the refractive index of the material of the negative lens constituting the second lens group is n2b ,
1.7 <Δ2X / √ | f1 · f2 | <2.3
1.85 <n2b
A zoom lens that satisfies the following conditions: - 前記第1レンズ群を構成するレンズの材料の屈折率の平均値をn1aとするとき、
1.88<n1a
なる条件を満足することを特徴とする請求項3または4に記載のズームレンズ。 When the average value of the refractive index of the material of the lens constituting the first lens group is n1a,
1.88 <n1a
The zoom lens according to claim 3, wherein the following condition is satisfied. - 前記第2レンズ群の広角端と望遠端での結像倍率を各々β2w、β2t、前記第3レンズ群の広角端と望遠端での結像倍率を各々β3w、β3tとするとき、
3.8<(β2t・β3w)/(β2w・β3t)<5.2
なる条件を満足することを特徴とする請求項1乃至5のいずれか1項に記載のズームレンズ。 When the imaging magnifications at the wide-angle end and the telephoto end of the second lens group are β2w and β2t, respectively, and the imaging magnifications at the wide-angle end and the telephoto end of the third lens group are β3w and β3t, respectively.
3.8 <(β2t · β3w) / (β2w · β3t) <5.2
The zoom lens according to claim 1 , wherein the following condition is satisfied. - 広角端から望遠端へのズーミングに際して、前記第1レンズ群は像側に凸状の軌跡で移動し、前記第2レンズ群は物体側に移動し、前記第3レンズ群は像側に移動することを特徴とする請求項1乃至6のいずれか1項に記載のズームレンズ。 During zooming from the wide-angle end to the telephoto end, the first lens group moves along a convex locus toward the image side, the second lens group moves toward the object side, and the third lens group moves toward the image side. The zoom lens according to claim 1 , wherein the zoom lens is a zoom lens.
- 前記第1レンズ群は負レンズと正レンズから成り、該負レンズの少なくとも1つの面は非球面形状であることを特徴とする請求項1乃至7のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 7, wherein the first lens group includes a negative lens and a positive lens, and at least one surface of the negative lens has an aspherical shape.
- 前記第1レンズ群は、像側の面が凹形状でメニスカス形状の負レンズ、物体側の面が凸形状でメニスカス形状の正レンズより成り、前記負レンズの像側の面は非球面形状であることを特徴とする請求項1乃至8のいずれか1項に記載のズームレンズ。 Wherein the first lens group, a negative lens on the image side surface is concave outcomes Nisukasu shape comprises a positive lens on the object side surface is convex outcomes Nisukasu shape, the image side surface of the negative lens is aspherical The zoom lens according to claim 1 , wherein the zoom lens has a shape.
- 前記第2レンズ群は、物体側より像側へ順に、正レンズ、正レンズ、負レンズ、正レンズから成ることを特徴とする請求項1乃至9のいずれか1項に記載のズームレンズ。 10. The zoom lens according to claim 1, wherein the second lens group includes a positive lens, a positive lens, a negative lens, and a positive lens in order from the object side to the image side.
- 前記第2レンズ群は、物体側より像側へ順に、物体側の面が凸形状の正レンズ、両レンズ面が凸形状の正レンズ、両レンズ面が凹形状の負レンズ、正レンズから成ることを特徴とする請求項1乃至10のいずれか1項に記載のズームレンズ。 The second lens group includes, in order from the object side to the image side, a positive lens having a convex surface on the object side, a positive lens having a convex shape on both lens surfaces, a negative lens having a concave shape on both lens surfaces, and a positive lens. The zoom lens according to claim 1 , wherein the zoom lens is a zoom lens.
- 前記第3レンズ群の焦点距離をf3とするとき、
1.9<f3/f2<2.5
なる条件を満足することを特徴とする請求項1乃至11のいずれか1項に記載のズームレンズ。 When the focal length of the third lens group is f3,
1.9 <f3 / f2 <2.5
The zoom lens according to claim 1 , wherein the following condition is satisfied. - 前記第3レンズ群の焦点距離をf3、広角端での全系の焦点距離をfwとするとき、
5.2<f3/fw<6.4
なる条件を満足することを特徴とする請求項1乃至12のいずれか1項に記載のズームレンズ。 When the focal length of the third lens group is f3 and the focal length of the entire system at the wide angle end is fw ,
5.2 <f3 / fw <6.4
The zoom lens according to claim 1 , wherein the following condition is satisfied. - 前記第3レンズ群は単一の正レンズより成ることを特徴とする請求項1乃至13のいずれか1項に記載のズームレンズ。 The zoom lens according to any one of claims 1 to 13, wherein the third lens group includes a single positive lens.
- 前記第3レンズ群を物体側に移動させて無限遠物体から近距離物体へのフォーカシングを行うことを特徴とする請求項1乃至14のいずれか1項に記載のズームレンズ。 The zoom lens according to claim 1, wherein the third lens group is moved toward the object side to perform focusing from an object at infinity to an object at a short distance.
- 固体撮像素子に像を形成することを特徴とする請求項1乃至15のいずれか1項に記載のズームレンズ。 The zoom lens according to claim 1 , wherein an image is formed on a solid-state image sensor.
- 請求項1乃至16のいずれか1項に記載のズームレンズと、該ズームレンズによって形成された像を受光する固体撮像素子とを有することを特徴とする撮像装置。 A zoom lens according to any one of claims 1 to 16, an imaging apparatus characterized by having a solid-state imaging device for receiving an image formed by the zoom lens.
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