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. 22, 1983
Filed:
Feb. 16, 1982
Karl H Drexhage, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Color filter arrays for color imaging devices are disclosed. The arrays are formed in a single layer of a transparent binder containing at least one cationic photo-bleachable dye. The layer has a thickness less than 10 microns, and the dye is present in the layer in an amount sufficient to impart a density to the layer of at least about 0.5 in that portion of the spectrum in which it selectivity absorbs. A method of making the arrays is also disclosed which includes the steps of (1) forming a layer of a transparent binder containing the photo-bleachable dye or dyes and a sensitizer; (2) exposing the layer to a pattern which represents a set of filter elements so as to photo-bleach the photo-bleachable dye; and (3) fixing the layer by leaching the sensitizer from the layer. In particularly preferred embodiments, the dyes are chosen so that those which absorb at longer wavelengths have a lower bleaching efficiency than those which absorb at shorter wavelengths.