Appeal No. 1997-2849
Application No. 08/348,811
fourth lens group in a displacement means for attaining
vibration reduction by moving the third lens group in a
direction substantially perpendicular to the optical axis. We
find in column 1, lines 45 through 63, that Umeda recognizes
the problem of employing displacement means in a zoom lens
system. In particular, Umeda discloses that if a displacement
means is employed to stabilize the blurring image in a zoom
lens system, it is desirable to correct aberrations caused in
the deflecting lens group by the deflecting lens group itself.
Umeda discloses in column 3, lines 48 through 60, that it is
desirable to dispose the deflecting lens group in the third
lens unit L . Umeda states that a deterioration of aberration
3
due to stabilizing the blurred image is required to be small.
It is therefore desirable to dispose the deflecting lens group
at a position where the height of incidence and the angle of
incidence do not change significantly during the zooming
operation. Furthermore, if the lens disposed at a place where
the principal ray of the off-axial light intersects with the
optical axis of the zoom lens system, it is utilized as the
deflecting lens group, a deterioration of aberration due to
the decentering of the deflecting lens group becomes small.
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