Zoom optical system, and imaging system incorporating the same

Details Zoom optical system, and imaging system incorporating the same Zoom optical system, and imaging system incorporating the same

2006-07-11

2006-07-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

07075732

ABSTRACT:
The invention relates to a zoom optical system wherein various aberrations are corrected while the total thickness of a lens arrangement upon received at a collapsible lens mount is reduced thereby ensuring compactness, high image-formation capabilities, and high zoom ratios at the wide-angle end, and an imaging system that incorporates the same. The zoom optical system comprises a first lens group G1of negative refracting power and a second lens group G2of positive refracting power. The first lens group G1comprises a negative single lens comprising at least one aspheric surface and a positive single lens with an air separation interposed between the negative single lens and the positive single lens. The second lens group G2comprises a positive lens, a cemented lens consisting of a positive lens and a negative lens and a positive lens, and comprises at least one aspheric surface. Zooming is carried out by varying a spacing between the respective lens groups. The zoom optical system satisfies condition (1) that defines the proper range of the refracting power profile for the first lens group G1, condition (2) that defines an angle-of-view range at the wide-angle end, and condition (3) that defines an angle-of-view range at the telephoto end.

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