Zoom lens and optical apparatus and method for manufacturing...

Details Zoom lens and optical apparatus and method for manufacturing... Zoom lens and optical apparatus and method for manufacturing...

2011-03-22

2011-03-22

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S676000

Reexamination Certificate

active

07911708

ABSTRACT:
A zoom lens includes 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, which are disposed in order from an object along the optical axis, wherein the third lens group comprises: a pre-group, which has a first positive lens, a negative meniscus lens having a convex surface facing the object, a second positive lens, and which has a positive refractive power; and a negative meniscus lens having a convex surface facing the object, which are disposed in order from the object; at least one of three surfaces of an object side and image side lens surfaces of the first positive lens and an object side lens surface of the negative meniscus lens is aspherical; and at least one of three surfaces of an object side lens surface of the second positive lens, and an object side and image side lens surfaces of the negative meniscus lens is aspherical.

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