Optical: systems and elements – Image stabilization – By movable refractive structure
Reexamination Certificate
1999-04-22
2001-03-20
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Image stabilization
By movable refractive structure
C359S554000, C359S689000
Reexamination Certificate
active
06204968
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a zoom lens system having a camera shake compensating function, and more specifically, to a zoom lens system having a camera shake compensating function suitable for use in a lens shutter camera, capable of preventing image blur due to camera shake (i.e. shake of the camera caused when the user holds the camera to perform photographing).
2. Description of the Prior Art
Conventionally, the failure in photographing was mostly attributed to camera shake and being out of focus. In recent years; however, most cameras employ the automatic focusing mechanism and with the improvement of focusing accuracy of the automatic focusing mechanism, the problem of the failure in photographing due to being out of focus has been practically solved. On the other hand, the lens system normally incorporated in the camera has shifted from a fixed focal length lens system to a zoom lens system, and with the shift, the magnification and the longest focal length have been increased. Consequently, camera shake very frequently occurs. As a result, presently, it is no exaggeration to say that a major cause of failure in photographing is caused by camera shake. For this reason, a camera shake compensating function can be indispensable for the zoom lens system.
As zoom lens systems having a camera shake compensating function, zoom lens systems have been proposed in which camera shake is compensated for by decentering a part of the lens (Japanese Laid-open Patent Applications Nos. H1-116619, H2-103014, H2-93620, H4-362909, H4-212916 and H6-95039).
In a zoom lens system having a camera shake compensating function, not only the optical performance is excellent in a standard condition (hereinafter, sometimes referred to as “predecentering condition”) but also the generation of aberrations (hereinafter, referred to as “decentering aberrations”) caused by the decentering of the lens is curbed to maintain the optical performance in a compensated condition (hereinafter, sometimes referred to as “post-decentering condition). In the above-mentioned prior arts, however, since the degradation of optical performance due to the decentering is great, sufficient optical performance is not obtained in the entire zoom range. Furthermore, the increase in magnification and the reduction in size are not sufficiently achieved.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a high-magnification, compact zoom lens system having a camera shake compensating function, capable of compensating camera shake while maintaining high optical performance in the entire zoom range.
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Minolta Co. , Ltd.
Nguyen Thong
Price and Gess
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