Patent US5579171A successfully refreshed from Google Patents.
US5579171A
Expired / Lapsed
US
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Zoom lens equipped with the image stabilizing function
Assignee: Nikon Corp
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Filing: 1995-11-22
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Granted: 1996-11-26
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Expires: 2015-11-22
Abstract
Abstract A zoom lens having a four-unit lens construction with positive, negative, positive, and positive refractive powers. In an embodiment, the second lens unit is moved toward the image side during the magnification change from the wide angle end to the telephoto end, and the third lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization. The zoom lens satisfies the condition that ΔY=f 4 /f 3 ·ΔS. In another embodiment, the first, third, and fourth lens units are moved toward the object side during the magnification change from the wide angle end to the telephoto end, and the second lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization. The zoom lens satisfies the condition that ΔY=(1-β 2 )·β 34 ·ΔS.
Inventors
- 👤 Kenzaburo Suzuki
- 👤 Masahiro Nakatsuji
- 👤 Keiji Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:01
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/64; G02B27/646; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/144113; G02B15/16; G02B15/163; G02B15/167; G02B15/173
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
170 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said second lens unit is moved toward the image side for magnification change, wherein said zoom lens includes image position displacing means for moving said third lens unit in a direction substantially orthogonal to the optical axis to effect image stabilization, and said zoom lens satisfies the following condition: ΔY=f.sub.4 /f.sub.3 ·ΔS, where ΔS is the amount of movement of the third lens unit in the direction substantially orthogonal to the optical axis, f 3 is the focal length of the third lens unit, f 4 is the focal length of the fourth lens unit, and ΔY is the amount of movement of the image during magnification change.
Claim 2
Dependent Claim
170 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said second lens unit is moved toward the image side for magnification change, wherein said zoom lens includes image position displacing means for moving said third lens unit in a direction substantially orthogonal to the optical axis to effect image stabilization, and said zoom lens satisfies the following condition: ΔY=f.sub.4 /f.sub.3 ·ΔS, where ΔS is the amount of movement of the third lens unit in the direction substantially orthogonal to the optical axis, f 3 is the focal length of the third lens unit, f 4 is the focal length of the fourth lens unit, and ΔY is the amount of movement of the image during magnification change.
Claim 3
Dependent Claim
72 words
A zoom lens equipped with an image stabilizing function according to claim 1, said zoom lens satisfying the following conditions: 0.5<f.sub.3 /(f.sub.W ·f.sub.T).sup.1/2 <1 ΔSmax/f.sub.3 <0.1, where f W is the focal length of the zoom lens at the wide angle end, f T is the focal length of the zoom lens at the telephoto end, and ΔSmax is the maximum amount of displacement of said third lens unit during image stabilization.
Claim 4
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 1, further comprising a flare stop for intercepting unnecessary light when said third lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 5
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 2, further comprising a flare stop for intercepting unnecessary light when said third lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 6
Dependent Claim
28 words
A zoom lens equipped with an image stabilizing function according to claim 1, wherein said third lens unit includes at least one convex lens and a concave lens.
Claim 7
Dependent Claim
28 words
A zoom lens equipped with an image stabilizing function according to claim 2, wherein said third lens unit includes at least one convex lens and a concave lens.
Claim 8
Dependent Claim
69 words
A zoom lens equipped with an image stabilizing function according to claim 5, said zoom lens satisfying the following conditions: 0.5<rt/f.sub.3 <20 L/f.sub.W <0.3, where rt is the radius of curvature of the object side surface of the convex lens in the third lens unit which is most adjacent to the image side, and L is the length of the third lens unit as measured along the optical axis.
Claim 9
Dependent Claim
69 words
A zoom lens equipped with an image stabilizing function according to claim 6, said zoom lens satisfying the following conditions: 0.5<rt/f.sub.3 <20 L/f.sub.W <0.3, where rt is the radius of curvature of the object side surface of the convex lens in the third lens unit which is most adjacent to the image side, and L is the length of the third lens unit as measured along the optical axis.
Claim 10
Dependent Claim
85 words
A zoom lens equipped with an image stabilizing function according to claim 5, satisfying said zoom lens satisfies the following conditions: 0.1<Δnd<0.4 15<Δνd<50, where Δnd is the average value of the refractive index of the concave lens of the third lens unit, minus the average value of the refractive index of the convex lens, and Δνd is the average value of the Abbe number of the convex lens of the third lens unit, minus the average value of the Abbe number of the concave lens.
Claim 11
Dependent Claim
84 words
A zoom lens equipped with an image stabilizing function according to claim 6, said zoom lens satisfying the following conditions: 0.1<Δnd<0.4 15<Δνd<50, where Δnd is the average value of the refractive index of the concave lens of the third lens unit, minus the average value of the refractive index of the convex lens, and Δνd is the average value of the Abbe number of the convex lens of the third lens unit, minus the average value of the Abbe number of the concave lens.
Claim 12
Dependent Claim
178 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said first lens unit, said third lens unit, and said fourth lens unit are moved toward the object side, wherein said zoom lens includes image position displacing means for moving said second lens unit in a direction substantially orthogonal to the optical axis to effect image stabilization, and said zoom lens satisfies the following condition: ΔY=(1-β.sub.2)·β.sub.34 ·ΔS, where ΔS is the amount of movement of said second lens unit in the direction substantially orthogonal to the optical axis, β 2 is the image magnification of said second lens unit, β 34 is the combined image magnification of said third lens unit and said fourth lens unit, and ΔY is the amount of movement of the image.
Claim 13
Dependent Claim
178 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said first lens unit, said third lens unit, and said fourth lens unit are moved toward the object side, wherein said zoom lens includes image position displacing means for moving said second lens unit in a direction substantially orthogonal to the optical axis to effect image stabilization, and said zoom lens satisfies the following condition: ΔY=(1-β.sub.2)·β.sub.34 ·ΔS, where ΔS is the amount of movement of said second lens unit in the direction substantially orthogonal to the optical axis, β 2 is the image magnification of said second lens unit, β 34 is the combined image magnification of said third lens unit and said fourth lens unit, and ΔY is the amount of movement of the image.
Claim 14
Dependent Claim
126 words
A zoom lens equipped with an image stabilizing function according to claim 11, said zoom lens satisfying the following conditions: 0.15<|f.sub.2 /f.sub.W ·f.sub.T).sup.1/2 |<1.0 -1.0<Δ.sub.2 /f.sub.W <0.2 ΔSmax/|f.sub.2 |<0.1, where f 2 is the focal length of said second lens unit, f W is the focal length of the zoom lens at the wide angle end, f T is the focal length of the zoom lens at the telephoto end, ΔSmax is the maximum amount of displacement of said second lens unit during image stabilization, and Δ 2 is the amount of movement of said second lens unit in the direction of the optical axis during the magnification changing operation, wherein movement toward the object side is positive and movement toward the image side is negative.
Claim 15
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 11, further comprising a flare stop for intercepting unnecessary light when said second lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 16
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 12, further comprising a flare stop for intercepting unnecessary light when said second lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 17
Dependent Claim
71 words
A zoom lens equipped with an image stabilizing function according to claim 12, said zoom lens satisfying the following conditions: -1.7<r.sub.- /f.sub.2 <-0.5 L/f.sub.W <0.5, where r - is the radius of curvature of the image side surface of the concave lens in said second lens unit which is most adjacent to the object side, and L is the length of the second lens unit as measured along the optical axis.
Claim 18
Dependent Claim
104 words
A zoom lens equipped with an image stabilizing function according to claim 11, wherein a surface in said second lens unit which is most adjacent to the object side is aspherical, the aspherical surface being given by: ##EQU3## where X(y) is the distance from the tangential plane on the lens vertex to the aspherical surface as measured in the direction of the optical axis, y is the height from the optical axis on the aspherical surface, k is a cone constant, A n is the aspherical surface coefficient, C is the curvature (1/r), and r is the radius of curvature at the lens vertex.
Claim 19
Dependent Claim
166 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said second lens unit is moved toward the image side for magnification change, wherein said third lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization of said zoom lens, and said zoom lens satisfies the following condition: ΔY=f.sub.4 /f.sub.3 ·ΔS, where ΔS is the amount of movement of the third lens unit in the direction substantially orthogonal to the optical axis, f 3 is the focal length of the third lens unit, f 4 is the focal length of the fourth lens unit, and ΔY is the amount of movement of the image during magnification change.
Claim 20
Dependent Claim
166 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said second lens unit is moved toward the image side for magnification change, wherein said third lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization of said zoom lens, and said zoom lens satisfies the following condition: ΔY=f.sub.4 /f.sub.3 ·ΔS, where ΔS is the amount of movement of the third lens unit in the direction substantially orthogonal to the optical axis, f 3 is the focal length of the third lens unit, f 4 is the focal length of the fourth lens unit, and ΔY is the amount of movement of the image during magnification change.
Claim 21
Dependent Claim
72 words
A zoom lens equipped with an image stabilizing function according to claim 17, said zoom lens satisfying the following conditions: 0.5<f.sub.3 /(f.sub.W ·f.sub.T).sup.1/2 <1 ΔSmax/f.sub.3 <0.1, where f W is the focal length of the zoom lens at the wide angle end, f T is the focal length of the zoom lens at the telephoto end, and ΔSmax is the maximum amount of displacement of said third lens unit during image stabilization.
Claim 22
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 17, further comprising a flare stop for intercepting unnecessary light when said third lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 23
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 18, further comprising a flare stop for intercepting unnecessary light when said third lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 24
Dependent Claim
28 words
A zoom lens equipped with an image stabilizing function according to claim 17, wherein said third lens unit includes at least one convex lens and a concave lens.
Claim 25
Dependent Claim
28 words
A zoom lens equipped with an image stabilizing function according to claim 18, wherein said third lens unit includes at least one convex lens and a concave lens.
Claim 26
Dependent Claim
69 words
A zoom lens equipped with an image stabilizing function according to claim 21, said zoom lens satisfying the following conditions: 0.5<rt/f.sub.3 <20 L/f.sub.W <0.3, where rt is the radius of curvature of the object side surface of the convex lens in the third lens unit which is most adjacent to the image side, and L is the length of the third lens unit as measured along the optical axis.
Claim 27
Dependent Claim
69 words
A zoom lens equipped with an image stabilizing function according to claim 22, said zoom lens satisfying the following conditions: 0.5<rt/f.sub.3 <20 L/f.sub.W <0.3, where rt is the radius of curvature of the object side surface of the convex lens in the third lens unit which is most adjacent to the image side, and L is the length of the third lens unit as measured along the optical axis.
Claim 28
Dependent Claim
84 words
A zoom lens equipped with an image stabilizing function according to claim 21, said zoom lens satisfying the following conditions: 0.1<Δnd<0.4 15<Δνd<50, where Δnd is the average value of the refractive index of the concave lens of the third lens unit, minus the average value of the refractive index of the convex lens, and Δνd is the average value of the Abbe number of the convex lens of the third lens unit, minus the average value of the Abbe number of the concave lens.
Claim 29
Dependent Claim
84 words
A zoom lens equipped with an image stabilizing function according to claim 22, said zoom lens satisfying the following conditions: 0.1<Δnd<0.4 15<Δνd<50, where Δnd is the average value of the refractive index of the concave lens of the third lens unit, minus the average value of the refractive index of the convex lens, and Δνd is the average value of the Abbe number of the convex lens of the third lens unit, minus the average value of the Abbe number of the concave lens.
Claim 30
Dependent Claim
174 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said first lens unit, said third lens unit, and said fourth lens unit are moved toward the object side, wherein said second lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization of said zoom lens and said zoom lens satisfies the following condition: ΔY=(1-β.sub.2)·β.sub.34 ·ΔS, where ΔS is the amount of movement of said second lens unit in the direction substantially orthogonal to the optical axis, β 2 is the image magnification of said second lens unit, β 34 is the combined image magnification of said third lens unit and said fourth lens unit, and ΔY is the amount of movement of the image.
Claim 31
Dependent Claim
174 words
A zoom lens equipped with an image stabilizing function, comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein, during magnification change from the wide angle end to the telephoto end, said first lens unit, said third lens unit, and said fourth lens unit are moved toward the object side, wherein said second lens unit is moved in a direction substantially orthogonal to the optical axis to effect image stabilization of said zoom lens and said zoom lens satisfies the following condition: ΔY=(1-β.sub.2)·β.sub.34 ·ΔS, where ΔS is the amount of movement of said second lens unit in the direction substantially orthogonal to the optical axis, β 2 is the image magnification of said second lens unit, β 34 is the combined image magnification of said third lens unit and said fourth lens unit, and ΔY is the amount of movement of the image.
Claim 32
Dependent Claim
126 words
A zoom lens equipped with an image stabilizing function according to claim 27, said zoom lens satisfying the following conditions: 0.15<|f.sub.2 /(f.sub.W ·f.sub.T).sup.1/2 |<1.0 -1.0<Δ.sub.2 /f.sub.W <0.2 ΔSmax/|f.sub.2 |<0.1, where f 2 is the focal length of said second lens unit, f W is the focal length of the zoom lens at the wide angle end, f T is the focal length of the zoom lens at the telephoto end, ΔSmax is the maximum amount of displacement of said second lens unit during image stabilization, and Δ 2 is the amount of movement of said second lens unit in the direction of the optical axis during the magnification changing operation, wherein movement toward the object side is positive and movement toward the image side is negative.
Claim 33
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 27, further comprising a flare stop for intercepting unnecessary light when said second lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 34
Dependent Claim
53 words
A zoom lens equipped with an image stabilizing function according to claim 28, further comprising a flare stop for intercepting unnecessary light when said second lens unit is moved in the direction substantially orthogonal to the optical axis for image stabilization and that is disposed in a fixed relationship with the optical axis.
Claim 35
Dependent Claim
71 words
A zoom lens equipped with an image stabilizing function according to claim 28, said zoom lens satisfying the following conditions: -1.7<r.sub.- /f.sub.2 <-0.5 L/f.sub.W <0.5 where r - is the radius of curvature of the image side surface of the concave lens in said second lens unit which is most adjacent to the object side, and L is the length of the second lens unit as measured along the optical axis.
Claim 36
Dependent Claim
104 words
A zoom lens equipped with an image stabilizing function according to claim 27, wherein a surface in said second lens unit which is most adjacent to the object side is aspherical, the aspherical surface being given by: ##EQU4## where X(y) is the distance from the tangential plane on the lens vertex to the aspherical surface as measured in the direction of the optical axis, y is the height from the optical axis on the aspherical surface, k is a cone constant, A n is the aspherical surface coefficient, C is the curvature (1/r), and r is the radius of curvature at the lens vertex.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-11-26 | 2000-05-27 | 2000-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-26 | 2004-05-27 | 2004-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-26 | 2008-05-27 | 2008-11-26 | $7700.00 | Window Closed / Lapsed |