Wide zoom lens system

Details Wide zoom lens system Wide zoom lens system

2007-06-05

2007-06-05

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S691000, C359S900000

Reexamination Certificate

active

11225093

ABSTRACT:
Providing a wide zoom lens system having a wide angle of view in the wide-angle end state and a high speed aperture ratio suitable for a solid-state imaging device with securing high optical performance. The system includes, in order from an object, a first lens group having negative refractive power and a second lens group having positive refractive power. The first lens group includes, in order from the object, a negative meniscus lens having convex surface facing to the object, a negative lens, and a positive lens having convex surface facing to the object. The second lens group includes, in order from the object, a positive lens, and a negative lens. At least one surface of the negative meniscus lens of the first lens group is composed of an aspherical surface. Zooming is carried out by changing a distance between the first and second lens groups. Given conditions are satisfied.

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