Patent ID: 6019151
Filing Date: 2000-02-01
Classification: B41J,B41M,C09D

Abstract:
Apparatus for digital printing images in annular-radial coordinates onto discs having an axis of rotation, the printing to occur between an inner radius R1 of the disc and an outer radius R2 of the disk; said apparatus comprising:a linear printhead array extending radially of the disc at least between inner radius R1 and outer radius R2; anda drive adapted to rotate the disc about the axis while the printhead is imagewise addressed to create an imaged area that is symmetric to the center of the disc and adapted to rotate the disc at an annular velocity such that the spatial resolution of the printed image along the outer edge of the image is the same as that of an original image being printed, wherein the image area is divided into discrete sections to be printed in associated tiles located on the disc such that:(xi, yi)=>(ri, .theta.i),where (xi, yi) are local coordinates of the center of the associated tile, and (.theta.i is determined by a radial line through the center of the associated tile.