Internal focusing zoom lens

Optical: systems and elements – Lens – With variable magnification

Reexamination Certificate

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Details

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

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