Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-01-04
2005-01-04
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S701000, C359S695000
Reexamination Certificate
active
06839187
ABSTRACT:
A lens distance-varying mechanism for varying a distance between first and second lens groups includes a first lens frame; a second lens frame rotatable relative to the first lens frame; a relative-moving mechanism for moving the first and second lens frames to change a relative position therebetween on an optical axis when the second lens frame is positioned at each of forward and reverse rotation extremities thereof relative to the first lens frame; a differential linking ring which rotates together with the second lens frame; a differential ring which is rotated relative to the differential linking ring by a first angle of rotation greater than a second angle of rotation of the second lens frame relative to the first lens frame; and a biasing member, positioned between the differential ring and the differential linking ring, for absorbing a difference between the first and second angles of rotation.
REFERENCES:
patent: 4974949 (1990-12-01), Tanaka
patent: 5528430 (1996-06-01), Hamasaki
patent: 5790901 (1998-08-01), Nakayama et al.
patent: 6369955 (2002-04-01), Enomoto et al.
patent: 6437922 (2002-08-01), Enomoto et al.
patent: 6456445 (2002-09-01), Nomura et al.
patent: 6493512 (2002-12-01), Sato
patent: 6512638 (2003-01-01), Sato et al.
patent: 6519096 (2003-02-01), Nomura et al.
patent: 6631035 (2003-10-01), Iikawa et al.
patent: 6-100708 (1994-12-01), None
patent: 8-94907 (1996-04-01), None
patent: 2000-199843 (2000-07-01), None
patent: 2000-275518 (2000-10-01), None
Nomura Hiroshi
Sasaki Takamitsu
Tanaka Hitoshi
Epps Georgia
Greenblum & Bernstein P.L.C.
Hasan M.
PENTAX Corporation
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