Patent ID: 8951714
Filing Date: 2015-02-10
Classification: B23K,B41C,B41N

Abstract:
1. A relief printing plate manufacturing method of manufacturing a relief printing plate by laser engraving, the method comprising: a binary image data generating step of generating binary image data based on multivalued image data representing a printing image; an engraving target shape data generating step of generating, from the binary image data, target stereoscopic shape data as an engraving target; an exposure amount data generating step of calculating, based on the target stereoscopic shape data, exposure amount data, based on which an output of laser light by a laser engraving machine is controlled; an edge exposure amount setting step of providing a predetermined exposure amount to an outside image adjacent pixel in a range of predetermined pixels adjacent to an ON pixel corresponding to an image part of the binary image data; and a laser engraving step of applying laser light to an area of OFF pixels corresponding to a no-image part of the binary image data on the plate based on the exposure amount data to engrave a portion outside of an area to be left on the plate as the image part, and applying laser light to the outside image adjacent pixel on the plate based on the predetermined exposure amount set in the edge exposure amount setting step to form a relief having a projecting shape with a corner part of a flange part of a top face of the relief corresponding to the image part at least partially chamfered from the top face toward a depth direction.