Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-03-20
2007-03-20
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S740000
Reexamination Certificate
active
11373800
ABSTRACT:
At least one exemplary embodiment is directed to a zoom lens system which includes a first lens unit having a positive optical power, a second lens unit having a negative optical power and positioned on the image side of the first lens unit, a third lens unit having a positive optical power and positioned on the image side of the second lens unit, a fourth lens unit having a positive optical power and positioned on the image side of the third lens unit, and an F-number determining member. The F-number determining member can be positioned between a vertex of an object-side lens surface of a lens that is nearest to an object side in the third lens unit and an intersecting point of the object-side lens surface and a peripheral portion of the lens in a direction of an optical axis.
REFERENCES:
patent: 4854684 (1989-08-01), Horiuchi
patent: 5424869 (1995-06-01), Nanjo
patent: 6016228 (2000-01-01), Uzawa
patent: 6456441 (2002-09-01), Hoshi
patent: 6975461 (2005-12-01), Eguchi
patent: 6-34882 (1994-02-01), None
patent: 10-62687 (1998-03-01), None
patent: 2001-194586 (2001-07-01), None
patent: 2003-315676 (2003-11-01), None
Canon USA , Inc. Intellectual Property Division
Sugarman Scott J.
LandOfFree
Zoom lens system and image pickup apparatus including the same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zoom lens system and image pickup apparatus including the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system and image pickup apparatus including the same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3729757