Large magnification factor zoom lens

Details Large magnification factor zoom lens Large magnification factor zoom lens

2007-06-19

2010-06-29

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07746563

ABSTRACT:
This large magnification factor zoom lens includes, in an order arranged from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The third lens group includes, in an order arranged from the object side, a positive lens, a positive lens, a positive meniscus lens having a larger radius of curvature on an image surface side, and a negative lens. The positive lens has an aspherical surface on an object side.

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