Patent ID: 7482568
Filing Date: 2009-01-27
Classification: B23K,B44B,B44C,B44F

Abstract:
1. A system for producing an image inside an object which is viewable therethrough comprising: a basic image generator generating a basic image comprising at least two of gray shades; a sub-image generator generating a number of sub-images corresponding to the number of gray shades of comprising the basic image; an auxiliary image generator determining a number of auxiliary images from the sub-images, each auxiliary image comprising one or more points spaced apart by greater than a first minimum distance for which failure of the object may occur; and a laser beam emitting element for generating said auxiliary images in said object, each auxiliary image comprising one or more etch points positioned in a plane in said object and spaced by a distance no less than said first minimum distance, said etch points comprising an area of destruction in said object caused by laser light emitted by said element, said auxiliary images lying in parallel planes spaced apart by no less than a second minimum distance, said auxiliary images, when viewed in a direction generally perpendicular thereto forming a reproduction of said basic image.