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:
Jan. 07, 2003
Filed:
Aug. 15, 2001
Manfred Matthae, Jena, DE;
Lothar Schreiber, Jena, DE;
Andreas Faulstich, Goettingen, DE;
Werner Kleinschmidt, Adelebsen, DE;
Carl Zeiss Jena GmbH, Jena, DE;
Abstract
A high-aperture objective comprising a first lens L with positive refractive power f and a second lens L with negative refractive power f wherein the focal length ratio between the two lenses is in the range of −0.4<(f /f )<−0.1 and the total refractive power /f /f is greater than zero, two positive lenses L L whose ratio diameter d d to focal length f f satisfies the condition greater than 0.3 and less than 0.6:0.3<d /f <0.6, 0.3<d /f <0.6, a negative lens L and a collective lens L wherein the negative lens faces the front group and the focal length ratio of L and L f /f is between −0.5 and −2:−0.5<f /f <−2.