EP0942309A2
Expired / Lapsed
EP
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Variable magnification lens having image stabilizing function
Assignee: Canon Inc
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Filing: 1999-03-11
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Granted: —
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Expires: 2019-03-11
Abstract
Abstract An image stabilizer for stabilizing an image against unexpected vibrations or shaking of a zoom lens includes a diaphragm arranged to vary its full-open aperture diameter according to a magnification varying (zooming) action from a wide-angle end position to a telephoto end position of the zoom lens for the purpose of preventing variations in light quantity which more conspicuously take place in the peripheral part than in the central part of an image plane when an image stabilizing action is performed. <IMAGE>
Inventors
- 👤 Kazuhiro C/O Canon Kabushiki Kaisha Noguchi
- 👤 Tadanori c/o Canon Kabushiki Kaisha Okada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:53
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/144113; G02B27/00; G02B27/64; G02B27/646; H; H04; H04N; H04N23/00; H04N23/60; H04N23/68; H04N23/681; H04N23/6812; H04N23/682; H04N23/685; H04N23/687
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
An image stabilizer for a variable magnification
lens, comprising: a diaphragm disposed in an optical path of said
variable magnification lens; and control means for providing a control to vary a
full-open aperture diameter of said diaphragm according
to a focal length of said variable magnification lens.
Claim 2
Dependent Claim
34 words
An image stabilizer according to claim 1,
wherein said control means provides a control to make the
full-open aperture diameter of said diaphragm smaller
when said variable magnification lens is on a telephoto
side.
Claim 3
Dependent Claim
20 words
An image stabilizer according to claim 1,
wherein said variable magnification lens has an F-number
diaphragm which determines an F-number.
Claim 4
Dependent Claim
20 words
An image stabilizer according to claim 3,
wherein said diaphragm and said F-number diaphragm are
disposed adjacent to each other.
Claim 5
Dependent Claim
36 words
An image stabilizer according to claim 4,
wherein said diaphragm is controlled by said control
means in such a way as to limit an on-axial light flux
when said variable magnification lens on a telephoto
side.
Claim 6
Dependent Claim
38 words
An image stabilizer according to claim 1,
wherein said variable magnification lens has a
decentering lens arranged to decenter in a direction
perpendicular to an optical axis of said variable
magnification lens so as to stabilize an image.
Claim 7
Dependent Claim
42 words
An image stabilizer according to claim 1,
further comprising focal length detecting means for
detecting the focal length of said variable magnification
lens, wherein said control means controls said diaphragm
according to the focal length detected by said focal
length detecting means.
Claim 8
Dependent Claim
16 words
An image stabilizer according to claim 1,
wherein said variable magnification lens is a zoom lens.
Claim 9
Dependent Claim
57 words
An image stabilizer according to claim 1,
further comprising an image pickup device disposed on an
image plane of said variable magnification lens and
arranged to convert an optical image formed by said
variable magnification lens into an electrical signal,
and vibration correcting means for correcting vibration
of said variable magnification lens by processing the
electrical signal.
Claim 10
Dependent Claim
48 words
An image stabilizer for a variable
magnification lens, comprising: a diaphragm disposed in an optical path of said
variable magnification lens; and control means for providing a control to cause
said diaphragm to limit an on-axial light flux when said
variable magnification lens is on a telephoto side.
Claim 11
Dependent Claim
34 words
An image stabilizer according to claim 10,
wherein said control means provides a control to make the
full-open aperture diameter of said diaphragm smaller
when said variable magnification lens is on a telephoto
side.
Claim 12
Dependent Claim
20 words
An image stabilizer according to claim 10,
wherein said variable magnification lens has an F-number
diaphragm which determines an F-number.
Claim 13
Dependent Claim
20 words
An image stabilizer according to claim 12,
wherein said diaphragm and said F-number diaphragm are
disposed adjacent to each other.
Claim 14
Dependent Claim
36 words
An image stabilizer according to claim 13,
wherein said diaphragm is controlled by said control
means in such a way as to limit an on-axial light flux
when said variable magnification lens on a telephoto
side.
Claim 15
Dependent Claim
38 words
An image stabilizer according to claim 10,
wherein said variable magnification lens has a
decentering lens arranged to decenter in a direction
perpendicular to an optical axis of said variable
magnification lens so as to stabilize an image.
Claim 16
Dependent Claim
42 words
An image stabilizer according to claim 10,
further comprising focal length detecting means for
detecting the focal length of said variable magnification
lens, wherein said control means controls said diaphragm
according to the focal length detected by said focal
length detecting means.
Claim 17
Dependent Claim
16 words
An image stabilizer according to claim 10,
wherein said variable magnification lens is a zoom lens.
References Cited (Backward Citations)
No citation records indexed.
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