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:
Aug. 11, 2009
Filed:
Sep. 17, 2003
Applicants:
Hans-jürgen Mann, Oberkochen, DE;
Martin Lowisch, Oberkochen, DE;
Wolfgang Singer, Aalen, DE;
Inventors:
Assignee:
Carl Zeiss SMT AG, Oberkochen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03F 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A mask having a multilayer coating of a specified period thickness distribution such as those used in lithography devices for producing semiconductor components. One problem of projection optics concerns pupil apodization which leads to imaging defects. As here proposed, the period thickness in the mask plane is selected so that it is greater than the period thickness for maximum reflectivity. As a result, not only does the apodization over the pupil become more symmetric but the intensity variation also becomes smaller overall.