Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-08-02
2005-08-02
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
06924938
ABSTRACT:
A first group optical system having a positive refracting power, a second group optical system having a negative refracting power, and a third group optical system having a positive refracting power are sequentially arranged from an object side toward an image side. At least the first group optical system and the third group optical system move so that a distance between the first group optical system and the second group optical system becomes minimum at short focal-length side, and a distance between the second group optical system and the third group optical system becomes minimum at long focal-length side. The third group optical system includes a triplet lens formed with a negative lens, a positive lens, and a negative lens.
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Nishina Kiichiro
Ono Nobuaki
Tatsuno Hibiki
Epps Georgia
Hasan M.
Ricoh & Company, Ltd.
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