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:
Oct. 28, 2008
Filed:
Sep. 16, 2004
Ralf Becker, Bad Gandersheim, DE;
Ruediger Kittelmann, Einbeck, DE;
Eberhard Kurek, Kalefeld, DE;
Harry Wagener, Alfeld, DE;
Ulrich Zirfas, Bad Gandersheim, DE;
Ralf Becker, Bad Gandersheim, DE;
Ruediger Kittelmann, Einbeck, DE;
Eberhard Kurek, Kalefeld, DE;
Harry Wagener, Alfeld, DE;
Ulrich Zirfas, Bad Gandersheim, DE;
Schott AG, Mainz, DE;
Abstract
The optical diffuser has a transparent base body with a first surface, which is divided into facets. Each facet has an elevation or a depression correlated or associated with a second curved surface. Respective facets have correspondingly different geometrical shapes. In some embodiments the respective apexes (S) of the elevations or depressions are arranged along a spiral, especially an Archimedian spiral. In other embodiments the apexes (S) are defined by coordinates (x', y′) derived by rotation of coordinates (x, y) of all points (P), which are defined by an arrangement of facets with a regular hexagonal edge contour, about a center (0, 0) through a twist angle (δ). Alternatively the apexes (S) are defined by coordinates (x″, y″) derived from coordinates (x, y) of all points (P), which are defined by the arrangement of facets with the regular hexagonal edge contour, by random variations with the help of a Monte Carlo method. The optical diffuser according to the invention produces a circular soft-edged light field, which is outstanding for photographic applications.