Zoom lens optical system

Optical: systems and elements – Lens – Multiple component lenses

Reexamination Certificate

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Details

C359S774000, C359S757000

Reexamination Certificate

active

07342730

ABSTRACT:
A compact zoom lens optical system suitable for use in a camera using a solid state photographing device and providing excellent correction of color aberrations, high zooming ratio, and telecentricity. The zoom lens optical system includes: a first lens group having a positive refractive power, the first lens group including two lenses; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group having a positive refractive power. The first through fifth lens groups are sequentially arranged from an object side and the first lens group is moved during zooming from a wide angle position to a telephoto position.

REFERENCES:
patent: 6721105 (2004-04-01), Ohtake et al.
patent: 2005/0190447 (2005-09-01), Misaka
patent: 2006/0056055 (2006-03-01), Obama et al.
patent: 2002-098893 (2002-04-01), None
patent: 2005-017915 (2005-01-01), None
patent: 2005-055625 (2005-03-01), None
patent: 2005-070437 (2005-03-01), None
patent: 2005-107273 (2005-04-01), None

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