Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-10-29
2010-12-14
Martinez, Joseph (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S704000
Reexamination Certificate
active
07852569
ABSTRACT:
An internal focusing zoom lens includes a stationary barrel including a focus-guide cam groove; a zoom cam ring including a focus-shift cam groove and rotated about an optical axis during zooming; a focus cam ring including a focus cam groove and rotated about the optical axis and moved in the optical axis direction to move a focusing lens group during focusing; and a focus correction ring for moving the focus cam ring in the optical axis direction by rotation of the zoom cam ring. The focus correction ring includes a focus correction cam-follower engaged in the focus-shift cam groove, the focus cam groove and the focus-guide cam groove. A position of the focus correction cam-follower in the focus cam groove changes via the focus-shift cam groove and the focus-guide cam groove in accordance with the rotation of the zoom cam ring during zooming.
REFERENCES:
patent: 6631035 (2003-10-01), Iikawa et al.
patent: 7649695 (2010-01-01), Koyama et al.
patent: 2004/0160683 (2004-08-01), Nomura et al.
patent: 2005/0254143 (2005-11-01), Saito et al.
patent: 2006/0034595 (2006-02-01), Yamazaki et al.
patent: 2006/0034596 (2006-02-01), Yamazaki et al.
patent: 2008/0252993 (2008-10-01), Eguchi
patent: 2000-89086 (2000-03-01), None
patent: 3461224 (2003-08-01), None
Greenblum & Bernstein P.L.C.
Hoya Corporation
Martinez Joseph
LandOfFree
Internal focusing zoom lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Internal focusing zoom lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal focusing zoom lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4197492