Interchangeable lens system

Details Interchangeable lens system Interchangeable lens system

2007-01-02

2007-01-02

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

C359S740000

Reexamination Certificate

active

11192733

ABSTRACT:
A lens system is provided. The lens system includes a first lens system moveable between a first position removed from an optical axis and a second position on the optical axis. The first lens system includes a first lens element, an aperture stop, and a second lens element positioned in order from an object side to an image side of the lens system. The first lens system has a first focal length. A second lens system is moveable between a first position on the optical axis and a second position removed from the optical axis. The second lens system has a second focal length with the second focal length being greater than the first focal length such that a magnification ratio change results from interchanging the first lens system and the second system on the optical axis.

REFERENCES:
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patent: 5097360 (1992-03-01), Fukami et al.
patent: 5408361 (1995-04-01), Iwata
patent: 6449430 (2002-09-01), Tasaka et al.
patent: 6873473 (2005-03-01), Lewis et al.
patent: 6995920 (2006-02-01), Nurishi

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