Printing – Printing members – Blanks and processes
Patent
1994-02-04
1995-06-27
Yan, Ren
Printing
Printing members
Blanks and processes
21912168, 21912181, B41C 100
Patent
active
054270260
ABSTRACT:
A press sheet engraving apparatus produces a press sheet by forming concavities on a synthetic resin sheet with a radiation of a laser beam on the synthetic resin sheet in response to image data. This press sheet engraving apparatus is comprised of a cylinder having the synthetic resin sheet wound thereon, a rotating device for rotating the cylinder, a laser emitting diode for emitting a laser beam, a sliding device for sliding the laser emitting diode in parallel to a central axis of the cylinder, a comparing circuit for comparing a density of the image data and a predetermined threshold level at every image data corresponding to one line parallel to a rotational direction of the cylinder, and a controller for controlling the rotating device, the laser emitting diode and the sliding device on the basis of an output signal of the comparing circuit, wherein the controller forms the press sheet by engraving a concavity corresponding to image data of a level lower than the threshold level and a concavity corresponding to image data of a level higher than the threshold level while the cylinder rotates a plurality of times when image data of a level higher than the threshold level exits within the image data corresponding to one line and forms the press sheet by engraving a concavity corresponding to the image data while the cylinder rotates once when the image data of a level higher than the threshold level does not exist in the image data corresponding to one line.
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patent: 4944826 (1990-07-01), Zollman et al.
patent: 5126531 (1992-06-01), Majima et al.
patent: 5247883 (1993-09-01), Kuwahara et al.
patent: 5259311 (1993-11-01), McCaughey, Jr.
patent: 5278027 (1994-01-01), Clarke
patent: 5293426 (1994-03-01), Wouch et al.
Kananen Ronald P.
Sony Corporation
Yan Ren
LandOfFree
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