Zoom lens, and electronic imaging system using the same

Details Zoom lens, and electronic imaging system using the same Zoom lens, and electronic imaging system using the same

2005-12-13

2005-12-13

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

06975462

ABSTRACT:
A zoom lens has an easily bendable optical path with high optical specification performance such as a high zoom ratio, a wide-angle arrangement, a small F-number and reduced aberrations. The lens comprises a first lens group GI that remains fixed during zooming, a second lens group G2 that has negative refracting power and moves during zooming, a third lens group G3 that has positive refracting power and moves during zooming, and a fourth lens group G4 that has positive refracting power and moves during zooming and focusing. The first lens group comprises, in order from an object side thereof, a negative meniscus lens component convex on an object side thereof, a reflecting optical element for bending an optical path and a positive lens. The fourth lens group G4 moves in a locus opposite to that of movement of the third lens group G3 during zooming when focusing on infinity.

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Shashin Kogyo (Photographic Industry) Mar. 2002 (pp. 104-105).

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