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:
Sep. 03, 2002
Filed:
Aug. 20, 2001
Rudolf Von Bünau, Essingen, DE;
Jörg Schultz, Aalen, DE;
Johannes Wangler, Königsbronn, DE;
Carl-Zeiss-Stiftung, , DE;
Abstract
An illuminating device of a projection-microlithographic device includes a light source, an objective, and a device which produces a particular image field configuration. The device has fields which, in the direction of scanning movement, are separated at least in parts by a free zone, and are located in a peripheral region of the circular image field of a downstream projection objective in a manner at least approximating rotation symmetry. The integral of the quantity of light passing through the fields in the scanning direction are constant over the entire extent of the image field configuration in the direction at right angles to the scanning direction. Such an image field configuration replaces a conventional rectangular scanner slot formation whose width in the scanning direction corresponds to the forementioned integral of the image field configuration. The design of the image field configuration permits an approximately rotationally symmetric illumination of the projection objective.