Zoom lens

Details Zoom lens Zoom lens

2011-05-10

2011-05-10

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07940470

ABSTRACT:
A zoom lens includes sequentially from an object side, a positive first lens group; a negative second lens group; a diaphragm; a positive third lens group; a positive fourth lens group; and a positive fifth lens group, wherein a first condition 0.8≦(SLM−(SLW+SLT)/2)/FW≦2.0 and a second condition F14t≦0 are satisfied. SLW is a distance from the diaphragm at a wide angle edge to an imaging plane; SLM is a distance from the diaphragm at an intermediate zoom position to the imaging plane; SLT is a distance from the diaphragm at a telephoto edge to the imaging plane; FW is optical system focal length for infinity at the wide angle edge; and F14t is a combined focal length for the first to the fourth lens groups at the telephoto edge.

REFERENCES:
patent: 2009/0116121 (2009-05-01), Take
patent: 2001-75008 (2001-03-01), None
patent: 2005-345714 (2005-12-01), None

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