Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-10-30
2007-10-30
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S684000, C359S685000, C359S715000, C359S740000, C359S774000
Reexamination Certificate
active
11672224
ABSTRACT:
A telescopic zoom lens system includes first through fourth lens groups, wherein upon zooming from the short to long focal length extremities, the first and fourth lens groups remain stationary, the second lens group moves toward the image side, and the third lens group moves toward the image side and thereafter moves toward the object side. The first lens group includes positive first and second sub-lens groups, the second sub-lens group being a focusing lens group and including a negative meniscus lens element having a convex surface on the object side and a positive lens element having a convex surface on the object side. The following condition (1) is satisfied:in-line-formulae description="In-line Formulae" end="lead"?2.7<flR/ft<3.5; (1)in-line-formulae description="In-line Formulae" end="tail"?wherein flR and ft designate the focal lengths of the second sub-lens group and the entire zoom lens system at the long focal length extremity, respectively.
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English Language Abstract of JP 2000-019398.
English Language Abstract of JP 2002-006215.
English Language Abstract of JP 2003-202497.
English Language Abstract of JP 2004-109559.
English Language Abstract of JP 6-051202.
English Language Abstract of JP 2001-356381.
U.S. Appl. No. 11/565,735 to Saori, filed Dec. 1, 2006. (still pending).
U.S. Appl. No. 11/690,275 to Saori, filed Mar. 23, 2007. (still pending).
Greenblum & Bernstein P.L.C.
PENTAX Corporation
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