Internal focusing zoom lens

Details Internal focusing zoom lens Internal focusing zoom lens

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.

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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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