Zoom system

Details Zoom system Zoom system

2005-02-08

2005-02-08

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Lens

With variable magnification

C359S744000, C359S368000

Reexamination Certificate

active

06853494

ABSTRACT:
The invention concerns a zoom system, having various materials (glass types) and variable air spaces, for example for a surgical (stereo)microscope, constructed from four symmetrically arranged lens groups (2through5), each two lens groups (2, 5; 3, 4) being arranged identically and in mirror-image fashion with respect to one another. As a result of the special selection of glass types having anomalous partial dispersion, and the specific design features, a high zoom factor is achieved with a short overall length, as well as good correction of the secondary spectrum, astigmatism, and field curvature.

REFERENCES:
patent: 3731990 (1973-05-01), Van Orden
patent: 4015897 (1977-04-01), Konoma et al.
patent: 4632520 (1986-12-01), Yamakawa
patent: 5708532 (1998-01-01), Wartmann
M690 (Leica brochure: Ophthalmologie [Ophthalmology]) M1-602-0de-1.94-SCH, Jan. 1994 printing.

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