Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-09-06
2005-09-06
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S701000
Reexamination Certificate
active
06940658
ABSTRACT:
A step-zoom lens includes two movable lens groups; a lens group support unit; and a cam ring having a cam groove. The cam groove includes a finite number of focal-length steps, so as to perform a focusing operation between infinite and closest photographing positions at each focal-length step. The cam groove includes a wide-angle mode section, a telephoto mode section, and a mode switching section. The closest photographing positions in two adjacent focal-length steps and the infinite photographing positions in two adjacent focal-length steps are adjacent to each other, respectively. One focal-length step of the infinite photographing position at a longest focal length in the wide-angle mode section is provided at one end of the mode switching section, and another focal-length step of the infinite photographing position at a shortest focal length in the telephoto mode section is provided at the other end.
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Sasaki Takamitsu
Shimizu Kunihiko
Tanaka Hitoshi
Epps Georgia
Greenblum & Bernstein P.L.C.
Hasan M.
PENTAX Corporation
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