Zoom lens

Details Zoom lens Zoom lens

2007-06-05

2008-11-11

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07450315

ABSTRACT:
A zoom lens includes, in order from an object side, a first group having a positive refractive power, a second group having a negative refractive power, a diaphragm, a third group having a positive refractive and a fourth group following the third group. When a power of the zoom lens varies from a wide-angle end to a telephoto end, the second group is moved along an optical axis toward an image side with the first and third groups fixed to the optical axis so as to vary the power and the fourth group is moved along the optical axis to perform correction of a position of the image plane, which is associated with the variation of the power, and focusing.

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patent: 2003 121738 (2006-04-01), None

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