Optical system and optical apparatus using the same

Details Optical system and optical apparatus using the same Optical system and optical apparatus using the same

2009-02-06

2011-11-22

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

08064145

ABSTRACT:
An optical system includes a front lens group, a stop, and a rear lens group arranged successively in order from the object side toward the image side. The front lens group includes a solid material element having a refractive action. The rear lens group includes a diffractive optical element. The solid material element is formed on at least one transmissive surface of a refractive optical element. An Abbe number of a solid material of the solid material element with respect to the d line, a partial dispersion ratio of the solid material with respect to the g line and the F line, respective thicknesses of the solid material element and the refractive optical element when measured on the optical axis, and respective focal lengths of the diffractive optical portion of the diffractive optical element and the solid material element in air satisfy predetermined conditional expressions.

REFERENCES:
patent: 5959785 (1999-09-01), Adachi
patent: 6115188 (2000-09-01), Nishio
patent: 6381079 (2002-04-01), Ogawa
patent: 7136237 (2006-11-01), Ogawa
patent: 7193789 (2007-03-01), Maetaki
patent: 7253973 (2007-08-01), Yasui
patent: 7426083 (2008-09-01), Endo
patent: 2001/0055157 (2001-12-01), Shirasuna

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