Patent · US Active

Wide range zoom system

US8958159B2 · kind B2 · utility

1Cited by

2References

9Claims

0Family size

Assignee

Carl Zeiss Microscopy GmbH · DE

Inventors

Michael Wacke · Oettingen, DE
Joerg Sprenger · Jena, DE

Key dates

Filing date	Jun 17, 2011
Grant date	Feb 17, 2015
Priority date	—
Expiry date	Nov 13, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG02B27/0075
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A wide range zoom system, for microscopes. The zoom system includes five lens groups, of which, starting at the object side, the second and fourth lens group are displaceable in the axial direction relative to the first, third and fifth lens group. A stop of variable opening diameter that is stationary relative to the first, third and fifth lens group is provided between the second and fourth lens group, wherein the maximum opening diameter of said stop is in middle zoom magnifications. As magnification increases, the object-side aperture increases non-linearly in relation to the magnification, such that in regions of low magnifications the object-side aperture increases more sharply than in regions of higher magnifications.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.