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:
Nov. 14, 2006
Filed:
Sep. 24, 2004
Rolf Wartmann, Waake, DE;
Jan Thirase, Goettingen, DE;
Rolf Wartmann, Waake, DE;
Jan Thirase, Goettingen, DE;
Carl Zeiss Jena GmbH, Jena, DE;
Abstract
The invention is directed to a stereoscopic microscope objective. A microscope objective of this kind contains five lenses. The first lens, considered from the object side, has a focal length between −2.11f and −1.20f; f is the total focal length of the microscope objective. This is followed by a second lens with a focal length between 1.30f and 1.45f, a third lens with a focal length between 1.15f and 1.37f, a fourth lens with a focal length between 0.65f and 1.7f, and a fifth lens with a focal length between −0.96f and 0.48f. Combined, the amount of the refractive power of the last two lenses is less than 0.31f. In the first lens and fifth lens, at least 80% of the refractive power is concentrated on the image-side surfaces. In the second lens, at least 60% of the refractive power is concentrated on the image-side surface. In the third lens, at least 60% of the refractive power is concentrated on the object-side surface. In the fourth lens, at least 70% of the refractive power is concentrated on the image-side surface. The first lens and the fifth lens are made of a material having an anomalous partial dispersion of a first type. The second lens, third lens and fourth lens are made of a material having an anomalous partial dispersion of a second type.