Patent ID: 6367935
Filing Date: 2002-04-09
Classification: G02B,G03H

Abstract:
A method for at least partly eliminating speckles in a laser image that is projected onto an image screen (37) having a screen surface area, by scanning said image screen by an illumination laser beam (34), comprising the following steps:(a) projecting said illumination laser beam (34) onto said image screen (37), (b) dividing said illumination laser beam (34) on its way to said image screen (37) into a plurality of partial beams (36), (c) illuminating with each partial beam (36) a partial screen area that is smaller than said screen surface area illuminated by said illumination laser beam (34), (d) generating different speckle patterns by respectively moving said partial beams (36) within an image element (32) to be projected onto said image screen (37), and (e) heterodyning said different speckle patterns on one another in such a way that said different speckle patterns average each other out of said laser image.