Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-03-15
2005-03-15
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S694000, C359S699000, C359S700000, C359S695000
Reexamination Certificate
active
06867926
ABSTRACT:
A cam mechanism includes a cam ring including a cam rib which is formed on a peripheral surface of the cam ring; and a follower ring which is concentric with the cam ring, the follower ring including a pair of cam followers which hold the cam rib between the pair of cam followers. Upon the cam ring and the follower ring being engaged with each other in an assembly process thereof, an inner cam follower of the pair of cam followers first approaches an end of the cam rib in a lengthwise direction thereof, and an outer cam follower of the pair of cam followers subsequently approaches the same end of the cam rib. A portion of the outer cam follower is extended outwards from a position of a peripheral surface of the inner cam follower in a circumferential direction of the follower ring.
REFERENCES:
patent: 5446593 (1995-08-01), Hamasaki et al.
patent: 5731913 (1998-03-01), Imanari
patent: 6631035 (2003-10-01), Iikawa et al.
patent: 6661586 (2003-12-01), Nomura et al.
patent: 6747807 (2004-06-01), Iikawa et al.
patent: 8-146278 (1996-06-01), None
Iikawa Makoto
Takahashi Masashi
Dinh Jack
Epps Georgia
PENTAX Corporation
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