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US 2012/0268833 A1Published application
Zoom lens
AssigneeAbility Enterprise Co., Ltd.
InventorHsiang-Ho CHOU
Life of this patent
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Abstract
An embodiment of this invention provides a zoom lens that includes, in order from an object side to an image-forming side, a first lens group having positive refraction power; a second lens group having negative refraction power; a third lens group having positive refraction power; and a fourth lens group having positive refraction power; wherein the second lens group and the fourth lens group move along an optical axis for zooming between a wide-angle end and a telephoto end.
Claims20
A zoom lens, in order from an object, comprising:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- and
- a fourth lens group having positive refractive power;
- wherein the second lens group and the fourth lens group are moved along an optical axial for zooming between a wide-angle end and a telephoto end.
3 more elements
Dependencies are inferred from the claim text.