Zoom lens and image pick-up apparatus

Details Zoom lens and image pick-up apparatus Zoom lens and image pick-up apparatus

2007-08-14

2007-08-14

Dang, Hung (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S764000

Reexamination Certificate

active

11146088

ABSTRACT:
A zoom lens is proposed, which includes a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power, which are arranged in order from an object side, performing zooming by moving the second lens group and the fourth lens group, wherein the first lens group includes a front lens group having negative refractive power, an optical member refracting a light path, and a rear lens group having positive refractive power, which are arranged in order from the object side, wherein the fourth lens group includes one single lens, and if an image forming power of the fifth lens group at an object distance of infinity is β5, a conditional formula (1) 1.0<β5<1.8 is satisfied.

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European Search Report; Application No./Patent No.: 05291263.1-1234; Dated: Jan. 2, 2007.

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