Zoom optical system and camera comprising the same

Details Zoom optical system and camera comprising the same Zoom optical system and camera comprising the same

2005-06-14

2005-06-14

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

06906869

ABSTRACT:
The invention relates to a compact two-group zoom optical system which has an angle of view of 70° or greater at the wide-angle end and satisfactory image-formation capability all over the zoom range while maintaining a zoom ratio of 3 or greater. The zoom optical system comprises a first lens group G1having positive refracting power and a second lens group G2having negative refracting power. For zooming from the wide-angle end to the telephoto end, the respective lens groups move toward the object side while the spacing between the first lens group G1and the second lens group G2becomes narrow.

REFERENCES:
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patent: 6008953 (1999-12-01), Itoh
patent: 6072638 (2000-06-01), Enomoto
patent: 6208471 (2001-03-01), Enomoto et al.
patent: 6268965 (2001-07-01), Enomoto
patent: 6396643 (2002-05-01), Yamanashi
patent: 11-14903 (1999-01-01), None
patent: 2000-28921 (2000-01-01), None
patent: 2000-137163 (2000-05-01), None

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