JP6296724B2 - ズームレンズ及びそれを有する画像投射装置 - Google Patents
ズームレンズ及びそれを有する画像投射装置 Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
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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
- G02B15/146—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 more than five groups
- G02B15/1465—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 more than five groups the first group being negative
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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
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
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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
-
- 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
- G02B15/20—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 an additional movable lens or lens group for varying the objective focal length
-
- 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
- G02B15/22—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 movable lens means specially adapted for focusing at close distances
- G02B15/24—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 movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/005—Diaphragms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
- G02B9/10—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only one + and one - component
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0046—Movement of one or more optical elements for zooming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
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Description
ズーミングに際して移動する前記複数のレンズ群のうち最も縮小共役側に配置された最終移動レンズ群は正の屈折力で広角端から望遠端へのズーミングに際して拡大共役側へ移動し、前記最終移動レンズ群は1以上の接合レンズを有し、
前記1以上の接合レンズには1以上の負レンズと1以上の正レンズが含まれており、前記1以上の負レンズの材料の平均屈折率と平均アッベ数を各々nn、νn、
前記1以上の正レンズの材料の平均屈折率と平均アッベ数を各々np、νp、
前記最終移動レンズ群の焦点距離をf、広角端における全系の焦点距離をfwとするとき、
5.00<f/fw
|nn−np|<0.080
0.0<νn−νp
なる条件式を満たすことを特徴としている。
5.00<f/fw ・・・(1)
|nn−np|<0.080 ・・・(2)
0.0<νn−νp ・・・(3)
なる条件式を満たしている。
0.001<|nn−np|<0.070 ・・・(2a)
3.5<νn−νp<5.0 ・・・(3a)
ここで、条件式(1a)の上限値を上回ると変倍時の性能変化が大きくなりすぎてしまうので好ましくない。
νav<40.0 ・・・(4)
なる条件式を満足するのが良い。
ここで、条件式(4a)の下限値を下回ると・・・・・ので好ましくない。
0.000<φa/fw<0.001 ・・・(5)
なる条件を満足するのが良い。条件式(5)の上限値を超えると倍率色収差が補正過剰となる。また下限値を超えると色収差が補正不足となってくる。更に好ましくは条件式(5)の数値範囲を次の如くとするのが良い。
次に各実施例において好ましい構成について説明する。1以上の接合レンズに含まれる1つの接合レンズの拡大共役側の面が凹形状、接合レンズ面が拡大共役側に凸形状、縮小共役側の面が縮小共役側に凸形状とすることが収差補正上望ましい。
また前述の各実施例と数値との関係を(表1)に示す。
(A) レンズ構成
広角 中間 望遠
f (焦点距離) 21.78 30.71 39.20
F (開口比) 2.8 2.8 2.8
画角 31.0 23.1 18.5
レンズ全長 167.9
BF 59.2
ズーム比 1.80
r1 = 56.19 d1 = 4.00 n1 =1.805 ν1 =25.4
r2 = 25.59 d2 = 8.20
r3 = 80.00 d3 = 3.03 n2 =1.531 ν2 =55.9
r4 = 32.22 d4 = 12.23
r5 = -31.78 d5 = 3.00 n3 =1.487 ν3 =70.2
r6 = 180.84 d6 = 5.01
r7 = 226.61 d7 = 6.91 n4 =1.806 ν4 =33.3
r8 = -50.67 d8 = 可変
r9 = ∞ d9 = 5.00(補助絞り)(AP)
r10 = 59.63 d10 = 3.46 n5 =1.487 ν5 =70.2
r11 = 185.24 d11 = 可変
r12 = 52.61 d12 = 4.08 n6 =1.834 ν6 =37.2
r13 = 326.80 d13 = 可変
r14 = ∞ d14 = 可変(開口絞り)(ST)
r15 =-266.18 d15 = 1.30 n7 =1.751 ν7 =31.7
r16 = 18.63 d16 = 8.76 n8 =1.487 ν8 =70.4
r17 = -28.72 d17 = 1.33
r18 = -19.55 d18 = 1.30 n9 =1.805 ν9 =25.4
r19 =-573.79 d19 = 0.50
r20 = 130.84 d20 = 8.59 n10=1.497 ν10 =81.5
r21 = -23.31 d21 = 可変
r22 = -63.20 d22 = 1.85 n11=1.686 ν11 =32.0
r23 = 76.16 d23 = 7.67 n12=1.755 ν12 =27.6
r24 = -53.54 d24 = 可変
r25 = 75.14 d25 = 4.45 n13=1.805 ν13 =25.4
r26 =-488.19 d26 = 2.3
r27 = ∞ d27 =30.0 n14 =1.516 ν14 =64.1
r28 = ∞ d28 = 1.9
r29 = ∞ d29 =17.7 n15 =1.805 ν15 =25.4
r30 = ∞ d30 = 5.0
r31 = ∞ d31 = 2.3 n16 =1.516 ν16 =64.1
変倍時 (2100mm) フォーカス時 (広角端)
群間隔 広角 中間 望遠 群間隔 1200mm 9000mm
d8 35.45 4.55 3.89 d6 5.25 4.70
d11 15.57 22.30 4.13 d8 34.81 36.44
d13 6.28 21.82 32.38
d14 19.39 9.65 1.50
d21 1.57 10.04 7.51
d24 1.00 10.89 29.85
(B) 非球面係数
r3
K=0 A=1.73E-05 B=-3.17E-08 C=2.98E-11 D=1.09E-13 E=-1.13E-16 F=-3.59E-19 G=6.86E-22
r4
K=0 A=1.22E-05 B=-3.39E-08 C=-1.53E-11 D=1.03E-13 E=1.31E-15 F=-5.79E-18 G=7.26E-21
(A) レンズ構成
広角 中間 望遠
f (焦点距離) 21.77 30.72 39.26
F (開口比) 2.8 2.8 2.8
画角 31.0 23.2 18.4
レンズ全長 175.0
BF 59.2
ズーム比 1.80
r1 = 47.15 d1 = 2.30 n1 = 1.805 ν1 = 25.4
r2 = 25.59 d2 = 11.59
r3 = 80.00 d3 = 3.16 n2 = 1.531 ν2 = 55.9
r4 = 33.74 d4 = 12.10
r5 = -30.75 d5 = 3.29 n3 = 1.487 ν3 = 70.2
r6 = 123.04 d6 = 1.14
r7 = 268.36 d7 = 5.97 n4 = 1.806 ν4 = 33.3
r8 = -49.48 d8 = 可変
r9 = ∞ d9 = 5.00(補助絞り)(AP)
r10 = 53.35 d10 = 3.12 n5 = 1.487 ν5 = 70.2
r11 = 102.43 d11 = 可変
r12 = 52.02 d12 = 4.41 n6 = 1.834 ν6 = 37.2
r13 = 668.69 d13 = 可変
r14 = ∞ d14 = 可変(開口絞り)(ST)
r15 = -57.99 d15 = 1.30 n7 = 1.755 ν7 = 27.6
r16 = 20.96 d16 = 8.34 n8 = 1.529 ν8 = 66.4
r17 = -26.77 d17 = 1.26
r18 = -19.01 d18 = 1.30 n9 = 1.805 ν9 = 25.4
r19 =-106.79 d19 = 0.50
r20 = 253.48 d20 = 8.04 n10 = 1.497 ν10 = 81.5
r21 = -24.99 d21 = 可変
r22 =-161.98 d22 = 1.85 n11 = 1.800 ν11 = 29.8
r23 = 100.00 d23 = 6.94 n12 = 1.805 ν12 = 25.4
r24 = -61.09 d24 = 可変
r25 = 70.40 d25 = 4.23 n13 = 1.805 ν13 = 25.4
r26 =2819.65 d26 = 2.3
r27 = ∞ d27 =30.0 n14 = 1.516 ν14 = 64.1
r28 = ∞ d28 = 1.9
r29 = ∞ d29 =17.7 n15 = 1.805 ν15 = 25.4
r30 = ∞ d30 = 5.0
r31 = ∞ d31 = 2.3 n16 = 1.516 ν16 = 64.1
変倍時 (2100mm) フォーカス時 (広角端)
群間隔 広角 中間 望遠 群間隔 1200mm 9000mm
d8 44.15 14.88 3.90 d6 5.25 4.70
d11 14.44 16.68 6.43 d8 34.81 36.44
d13 14.35 26.93 36.68
d14 14.72 7.44 1.19
d21 1.00 6.03 6.32
d24 0.50 17.20 34.65
(B) 非球面係数
r3 K=0 A=1.79E-05 B=-4.31E-08 C=1.90E-10 D=-7.30E-13 E=2.32E-15 F=-4.20E-18 G=3.21E-21
r4 K=0 A=1.14E-05 B=-3.66E-08 C=9.65E-11 D=-4.64E-13 E=2.58E-15 F=-6.98E-18 G=7.18E-21
(A) レンズ構成
広角 中間 望遠
f (焦点距離)21.75 30.70 39.24
F (開口比) 2.8 2.8 2.8
画角 31.0 23.1 18.5
レンズ全長 181.0
BF 59.2
ズーム比 1.80
r1 = 56.19 d1 = 4.00 n1 = 1.805 ν1 = 25.4
r2 = 25.59 d2 = 8.20
r3 = 80.00 d3 = 3.03 n2 = 1.531 ν2 = 55.9
r4 = 32.22 d4 = 12.23
r5 = -31.78 d5 = 3.00 n3 = 1.487 ν3 = 70.2
r6 = 180.84 d6 = 2.13
r7 = 226.61 d7 = 6.91 n4 = 1.806 ν4 = 33.3
r8 = -50.67 d8 = 可変
r9 = ∞ d9 = 5.00(補助絞り)(AP)
r10 = 59.63 d10 = 3.46 n5 = 1.487 ν5 = 70.2
r11 = 185.24 d11 = 可変
r12 = 52.61 d12 = 4.08 n6 = 1.834 ν6 = 37.2
r13 = 326.80 d13 = 可変
r14 = ∞ d14 = 可変(開口絞り)(ST)
r15 =-266.18 d15 = 1.30 n7 = 1.751 ν7 = 31.7
r16 = 18.63 d16 = 8.76 n8 = 1.487 ν8 = 70.4
r17 = -28.72 d17 = 1.33
r18 = -19.55 d18 = 1.30 n9 = 1.805 ν9 = 25.4
r19 =-573.79 d19 = 0.50
r20 = 130.84 d20 = 8.59 n10 =1.497 ν10 = 81.5
r21 = -23.31 d21 = 可変
r22 = -63.20 d22 = 1.85 n11 =1.686 ν11 = 32.0
r23 = 76.16 d23 = 7.67 n12 =1.755 ν12 = 27.6
r24 = -53.54 d24 = 可変
r25 = 75.14 d25 = 4.45 n13 =1.805 ν13 = 25.4
r26 =-488.19 d26 = 2.3
r27 = ∞ d27 =30.0 n14 =1.516 ν14 = 64.1
r28 = ∞ d28 = 1.9
r29 = ∞ d29 =17.7 n15 =1.805 ν15 = 25.4
r30 = ∞ d30 = 5.0
r31 = ∞ d31 = 2.3 n16 =1.516 ν16 = 64.1
変倍時 (2100mm) フォーカス時 (広角端)
群間隔 広角 中間 望遠 群間隔 1200mm 9000mm
d8 45.94 15.16 0.50 d6 5.25 4.70
d11 19.20 23.78 16.67 d8 34.81 36.44
d13 10.48 24.00 33.80
d14 15.59 7.20 0.67
d21 0.50 5.84 4.24
d24 0.50 16.22 36.31
(B) 非球面係数
r3 K=0 A=1.66E-05 B=-4.68E-08 C=1.01E-10 D=-1.40E-13 E=2.48E-16 F=-5.09E-19 G=3.63E-22
r4 K=0 A=1.04E-05 B=-5.19E-08 C=7.98E-11 D=-1.51E-13 E=7.29E-16 F=-2.14E-18 G=1.84E-21
ST 開口絞り B1 第1レンズ群 B2 第2レンズ群
B3 第3レンズ群 B4 第4レンズ群 B5 第5レンズ群
B6 第6レンズ群
Claims (8)
- 拡大共役側から縮小共役側へ順に、ズーミングに際して不動の負の屈折力の第1レンズ群、ズーミングに際して隣接するレンズ群との間の間隔が変化するように移動する複数のレンズ群、ズーミングに際して不動の正の屈折力の最終レンズ群を有するズームレンズであって、
ズーミングに際して移動する前記複数のレンズ群のうち最も縮小共役側に配置された最終移動レンズ群は正の屈折力で広角端から望遠端へのズーミングに際して拡大共役側へ移動し、前記最終移動レンズ群は1以上の接合レンズを有し、
前記1以上の接合レンズには1以上の負レンズと1以上の正レンズが含まれており、前記1以上の負レンズの材料の平均屈折率と平均アッベ数を各々nn、νn、
前記1以上の正レンズの材料の平均屈折率と平均アッベ数を各々np、νp、
前記最終移動レンズ群の焦点距離をf、広角端における全系の焦点距離をfwとするとき、
5.00<f/fw
|nn−np|<0.080
0.0<νn−νp
なる条件式を満たすことを特徴とするズームレンズ。 - 前記第1レンズ群はフォーカス機能を有し、ズーミングに際して移動する前記複数のレンズ群は拡大共役側から縮小共役側へ順に、正の屈折力の第2レンズ群、正の屈折力の第3レンズ群、負の屈折力の第4レンズ群、正の屈折力の第5レンズ群より構成されることを特徴とする請求項1に記載のズームレンズ。
- 前記1以上の接合レンズに含まれる1つの接合レンズの拡大共役側の面は拡大共役側に凹形状の面、接合面は拡大共役側に凸形状の面、縮小共役側の面は縮小共役側に凸形状の面であることを特徴とする請求項1又は2に記載のズームレンズ。
- 前記最終移動レンズ群に含まれるレンズの材料の平均アッベ数をνavとするとき、
νav<40.0
なる条件式を満足することを特徴とする請求項1乃至3のいずれか1項に記載のズームレンズ。 - 前記最終移動レンズ群は1枚の負レンズと1枚の正レンズが接合した接合レンズより構成されることを特徴とする請求項1乃至4のいずれか1項に記載のズームレンズ。
- 前記第3レンズ群の縮小共役側にズーミングに際して、他のレンズ群と異なった軌跡で移動する開口絞りを有することを特徴とする請求項2に記載のズームレンズ。
- 前記接合レンズの接合面の屈折力をφaとするとき、
0.000<φa/fw<0.001
なる条件式を満足することを特徴とする請求項5に記載のズームレンズ。 - 請求項1乃至7のいずれか1項に記載のズームレンズと、原画を形成する画像表示素子とを有し、前記画像表示素子によって形成された原画を前記ズームレンズによって投射することを特徴とする画像投射装置。
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