Two-group zoom lens

Details Two-group zoom lens Two-group zoom lens

2005-11-22

2005-11-22

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S692000

Reexamination Certificate

active

06967783

ABSTRACT:
A zoom lens is disclosed that is formed of only two lens groups. The first lens group includes, from the object side, a plastic lens element having negative refractive power and an aspheric surface, and a lens element having positive refractive power. The second lens group includes, from the object side: a biconvex lens element having an aspheric surface; a lens element having negative refractive power, a smaller curvature on its object side, and with its image-side surface joined to a biconvex lens element. The zoom lens satisfies specified conditions to: (a) allow for ease of manufacture and assembly while maintaining favorable correction of various aberrations, (b) assure that the zoom lens is compact in both the operational and retracted positions, (c) assure that the zoom lens is not easily damaged, and (d) assure that the optical performance is well-maintained despite changes in ambient conditions, such as temperature.

REFERENCES:
patent: 4999007 (1991-03-01), Aoki et al.
patent: 5663836 (1997-09-01), Ogata
patent: 6762887 (2004-07-01), Tomioka
patent: 2003/0179465 (2003-09-01), Noda
patent: 2001-21806 (2001-01-01), None

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