The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2012
Filed:
Apr. 22, 2009
Tsutomu Uzawa, Tokyo, JP;
Tsutomu Uzawa, Tokyo, JP;
Olympus Medical Systems Corp., Tokyo, JP;
Abstract
The invention provides a stereoscopic imaging optical system that has a total optical length short enough to be suitable for use in electron image microscopes. The stereoscopic imaging optical system comprises, in order from its object side, one objective lens DB and a plurality of zoom imaging optical systems ZI. Each zoom imaging optical system ZI comprises, in order from its object side, a positive first group G, a negative second group G, an aperture stop AS, a positive third group Gand a positive fourth group G. The second group moves for zooming on an optical axis, and the fourth group moves on the optical axis in association with the second group for correcting an image position fluctuation incidental to zooming. Various conditions are satisfied.