US4974950A
Expired / Lapsed
US
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Optical system for deflecting image
Assignee: Canon Inc
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Filing: 1989-06-06
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Granted: 1990-12-04
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Expires: 2009-06-06
Abstract
Abstract An optical system comprising, from front to rear, a first lens group of positive power, a second lens group of negative power and a third lens group of positive power, wherein deflection of an image is made by parallel decentering the second lens group.
Inventors
- 👤 Shoichi Yamazaki
- 👤 Nozomu Kitagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:16
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/0875
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
144 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition: |φ.sub.II φ.sub.III -(φ.sub.II -l)d|≦2 where φ II and φ III are the refractive powers of said second and said third lens groups respectively, d is the interval between the principal points of said first and said second lens groups, and l is the distance the image is shifted in a prescribed focal plane when said second lens group moves unit distance in a direction substantially perpendicular to an optical axis to effect parallel decentering, wherein the refractive power of the entire system is normalized to unity.
Claim 2
Dependent Claim
144 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition: |φ.sub.II φ.sub.III -(φ.sub.II -l)d|≦2 where φ II and φ III are the refractive powers of said second and said third lens groups respectively, d is the interval between the principal points of said first and said second lens groups, and l is the distance the image is shifted in a prescribed focal plane when said second lens group moves unit distance in a direction substantially perpendicular to an optical axis to effect parallel decentering, wherein the refractive power of the entire system is normalized to unity.
Claim 3
Dependent Claim
75 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition: |βb(1-βa)|≧1.2 where βa and βb are the magnifications of said second and said third lens groups respectively.
Claim 4
Dependent Claim
75 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition: |βb(1-βa)|≧1.2 where βa and βb are the magnifications of said second and said third lens groups respectively.
Claim 5
Dependent Claim
58 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition:
Claim 6
Dependent Claim
58 words
An optical system for deflecting an image, comprising: from front to rear, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group and the system satisfies the following condition:
Claim 7
Dependent Claim
26 words
-1. 65<f II /f<-0.1 where f II is the focal length of said second lens group, and f is the focal length of the entire system.
Claim 8
Dependent Claim
26 words
-1. 65<f II /f<-0.1 where f II is the focal length of said second lens group, and f is the focal length of the entire system.
Claim 9
Dependent Claim
33 words
An optical system according to claim 3, satisfying the following conditions: R.sub.II1 /f>-0.2, 0.1<R.sub.II1 /f where R III is the radius of curvature of the frontmost lens surface of said second lens group.
Claim 10
Dependent Claim
61 words
An optical system according to claim 4, wherein said second lens group does not include any cemented lens but includes an air lens of the shortest axial separation, and satisfying the following conditions: |R.sub.IIa /R.sub.IIb |<1.8 |f/(f.sub.II R.sub.IIa)|<0.16 |f/(f.sub.II R.sub.II b)|<0.11 where R IIa and R IIb are the radii of curvature of front and rear surfaces of said air lens.
Claim 11
Dependent Claim
47 words
An optical system according to claim 4, wherein said second lens group includes a cemented lens of a positive lens and a negative lens, and satisfying the following conditions: |R.sub.IIc /f|<0.05 where R IIc is the radius of curvature of the cemented surface of said cemented lens.
Claim 12
Dependent Claim
94 words
An optical system comprising: from front to rear, a first lens group having a positive refractive power: a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group; and wherein said third lens group includes at least one positive lens and at least one negative lens, and satisfying the following conditions: 0.15<f.sub.III /f<3 wherein f III is the focal length of said third lens group, and f is the focal length of the entire system.
Claim 13
Dependent Claim
94 words
An optical system comprising: from front to rear, a first lens group having a positive refractive power: a second lens group having a negative refractive power; and a third lens group having a positive refractive power; wherein the image is deflected by decentering said second lens group; and wherein said third lens group includes at least one positive lens and at least one negative lens, and satisfying the following conditions: 0.15<f.sub.III /f<3 wherein f III is the focal length of said third lens group, and f is the focal length of the entire system.
Claim 14
Dependent Claim
72 words
An optical system according to claim 7 wherein said third lens group does not include any cemented lens, but includes an air lens of the shortest axial separation, and satisfying the following conditions: 0.05<|f.sub.AIR /f|<1.8 |R.sub.III1 /R.sub.IIIK |<2.0 where f AIR is the focal length of said air lens, and R III1 and R IIIK are the radii of curvature of the frontmost and rearmost surfaces of said third lens group respectively.
Claim 15
Dependent Claim
84 words
An optical system according to claim 7, wherein said third lens group includes a cemented lens, and satisfying the following conditions: 0.03<|R.sub.IIIN /f|<0.6 0.05<|R.sub.IIIP /f|<0.7 0.05<|R.sub.IIIc /f| where R IIIN is the shortest of the radii of curvature of the surfaces of the negative lenses included in said third lens group, R IIIP is the longest of the radii of curvature of the surfaces of the positive lenses, and R IIIc is the radius of curvature of the cemented surface of said cemented lens.
Claim 16
Dependent Claim
66 words
A photographic optical system for stabilizing an image, comprising: a lens group movable for decentering from an optical axis of said photographic optical system to stabilize the image; a rear lens group positioned on the image side of said movable lens group, said system satisfying the following condition: |βb(1-βa)|>1 where βa and βb are the lateral magnifications of said movable and said rear lens groups respectively.
Claim 17
Dependent Claim
66 words
A photographic optical system for stabilizing an image, comprising: a lens group movable for decentering from an optical axis of said photographic optical system to stabilize the image; a rear lens group positioned on the image side of said movable lens group, said system satisfying the following condition: |βb(1-βa)|>1 where βa and βb are the lateral magnifications of said movable and said rear lens groups respectively.
Claim 18
Dependent Claim
12 words
An optical system according to claim 10, satisfying the following condition: |βb(1-βa)|≧1.2.
Claim 19
Dependent Claim
29 words
An optical system according to claim, 10, further comprising a front lens group positioned on the object side of said movable lens group and having a positive refractive power.
Claim 20
Dependent Claim
35 words
An optical system according to claim 12, satisfying the following condition: -1.65<f.sub.II /f<-0.1 where f II is the focal length of said movable lens group, and f is the focal length of the entire system.
Claim 21
Dependent Claim
54 words
An optical system according to claim 11 or 12, wherein said rear lens group includes at least one positive lens and at least negative lens, and satisfying the following condition: 0.15<f.sub.III /f<3 where f III is the focal length of said rear lens group and f is the focal length of the entire system.
Claim 22
Dependent Claim
78 words
An optical system according to claim 13, wherein said movable lens does not include any cemented lens, but includes an air lens of the shortest axial separation, and satisfying the following conditions: |R.sub.IIa /R.sub.IIb |<1.8 R.sub.II1 /f<-0.2, 0.1<R.sub.II1 /f where R IIa and R IIb are the radii of curvature of the front and rear surfaces of said air lens, and R II1 is the radii of curvature of the frontmost lens surface of said movable lens group.
Claim 23
Dependent Claim
116 words
An optical system for deflecting an image, comprising: from front to rear; a first lens group composed of a plurality of lenses and having as a whole a positive refractive power; a second lens group composed of a plurality of lenses and having as a whole a negative refractive power, the lens space between said first and second lens groups being the longest in the whole system; a third lens group composed of a plurality of lenses and having as a whole a positive refractive power; a sensor unit for sensing deflection of said optical system; and a driving unit for decentering said second lens unit on the basis of an output of said sensor unit.
Claim 24
Dependent Claim
116 words
An optical system for deflecting an image, comprising: from front to rear; a first lens group composed of a plurality of lenses and having as a whole a positive refractive power; a second lens group composed of a plurality of lenses and having as a whole a negative refractive power, the lens space between said first and second lens groups being the longest in the whole system; a third lens group composed of a plurality of lenses and having as a whole a positive refractive power; a sensor unit for sensing deflection of said optical system; and a driving unit for decentering said second lens unit on the basis of an output of said sensor unit.
Claim 25
Dependent Claim
97 words
An optical system according to claim 16, satisfying the following condition: |φ.sub.II φ.sub.III -(φ.sub.II -l)/d|≦2 where φ II and φ III are the refractive powers of said second and said third lens groups respectively, d is the interval between the principal points of said first and said second lens groups, and I is the distance the image is shifted in a prescribed focal plane when said second lens group moves unit distance in a direction substantially perpendicular to an optical axis to effect parallel decentering, wherein the refractive power of the entire system is normalized to unity.
Claim 26
Dependent Claim
28 words
An optical system according to claim 16, satisfying the following condition: |βb(1-βa)|≧1.2 where βa and βb are the magnifications of said second and said third lens groups respectively.
Claim 27
Dependent Claim
35 words
An optical system according to claim 16, satisfying the following condition: -1.65<f.sub.II /f<-0.1 where f II is the focal length of said second lens group, and f is the focal length of the entire system.
Claim 28
Dependent Claim
33 words
An optical system according to claim 19, satisfying the following conditions: R.sub.III /f<-0.2, 0.1<R.sub.III /f where R III is the radius of curvature of the frontmost lens surface of said second lens group.
Claim 29
Dependent Claim
60 words
An optical system according to claim 20, wherein said second lens group does not include any cemented lens but includes an air lens of the shortest axial separation, and satisfying the following conditions: |R.sub.IIa /R.sub.IIb |<1.8 |f/(f.sub.II R.sub.IIa)|<0.16 |f/(f.sub.II R.sub.IIb)|<0.11 where R IIa and R IIb are the radii of curvature of front and rear surfaces of said air lens.
Claim 30
Dependent Claim
47 words
An optical system according to claim 20, wherein said second lens group includes a cemented lens of a positive lens and a negative lens, and satisfying the following conditions: |R.sub.IIc /f|>0.05 wherein R IIc is the radius of curvature of the cemented surface of said cemented lens.
Claim 31
Dependent Claim
53 words
An optical system according to claim 16, wherein said third lens group includes at least one positive lens and at least one negative lens, and satisfying the following condition: 0.15<f.sub.III /f<3 where f III is the focal length of said third lens group, and f is the focal length of the entire system.
Claim 32
Dependent Claim
72 words
An optical system according to claim 23, wherein said third lens group does not include any cemented lens, but includes an air lens of the shortest axial separation, and satisfying the following conditions: 0.05<|f.sub.AIR /f|<1.8 |R.sub.III1 /R.sub.IIIK |<2.0 where f AIR is the focal length of said air lens, and R III1 and R IIIK are the radii of curvature of the frontmost and rearmost surfaces of said third lens group respectively.
Claim 33
Dependent Claim
72 words
A photographic optical system for stabilizing an image, comprising: a front lens group, and a rear lens group that is located behind said front lens group and is arranged to be decentered from the optical axis of the photographic optical system by a decentering means so as to stabilize an image formed by the rear lens group, while satisfying the condition: |(1-βa)|>1 wherein βa is the magnification of said rear lens group.
Claim 34
Dependent Claim
72 words
A photographic optical system for stabilizing an image, comprising: a front lens group, and a rear lens group that is located behind said front lens group and is arranged to be decentered from the optical axis of the photographic optical system by a decentering means so as to stabilize an image formed by the rear lens group, while satisfying the condition: |(1-βa)|>1 wherein βa is the magnification of said rear lens group.
Claim 35
Dependent Claim
49 words
A photographic optical system according to claim 25, wherein said decentering means further comprises sensor means for sensing vibratory motion or jiggle and means, connected to said sensor means, for decentering said rear lens group on the basis of the output of said sensor means to stabilize the image.
Claim 36
Dependent Claim
81 words
An optical system for deflecting an image, comprising: a front lens group having a positive refractive power, an intermediate lens group having a negative refractive power and, a rear lens group having a positive refractive power; wherein said intermediate lens group is decentered, so as to deflect the image, while the optical system satisfies the condition: -1.65<f.sub.II /f<-0.1 wherein f is the focal length of the entire optical system and f II is the focal length of the intermediate lens group.
Claim 37
Dependent Claim
81 words
An optical system for deflecting an image, comprising: a front lens group having a positive refractive power, an intermediate lens group having a negative refractive power and, a rear lens group having a positive refractive power; wherein said intermediate lens group is decentered, so as to deflect the image, while the optical system satisfies the condition: -1.65<f.sub.II /f<-0.1 wherein f is the focal length of the entire optical system and f II is the focal length of the intermediate lens group.
Claim 38
Dependent Claim
24 words
An optical system according to claim 27, satisfying the condition: 0.15<f.sub.III /f<3 wherein f III is the focal length of the rear lens group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |