US 11,752,774 B2
Inkjet printer image improvement techniques
Tanya Jegeris Snyder, Edina, MN (US); Dale James Ziebarth, Elk River, MN (US); and Bradley O'Hara, Chanhassen, MN (US)
Assigned to ASSA ABLOY AB, Stockholm (SE)
Filed by ASSA ABLOY AB, Stockholm (SE)
Filed on Oct. 1, 2020, as Appl. No. 17/60,643.
Claims priority of provisional application 63/078,270, filed on Sep. 14, 2020.
Prior Publication US 2022/0080740 A1, Mar. 17, 2022
Int. Cl. G06K 15/10 (2006.01); H04N 1/405 (2006.01); H04N 1/409 (2006.01); H04N 1/58 (2006.01); B41J 2/21 (2006.01); B41J 2/045 (2006.01); B41J 13/12 (2006.01)
CPC B41J 2/2132 (2013.01) [B41J 2/04593 (2013.01); B41J 13/12 (2013.01); G06K 15/105 (2013.01); H04N 1/409 (2013.01); H04N 1/4057 (2013.01); H04N 1/58 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a print head configured to selectively emit ink toward a print area to generate a printed image, the print head, relative to the print area, configured to pass across the print area along a first linear axis to provide the printed image; and
a controller configured:
to receive a representation of an image to be printed;
based on the representation, to provide first control signals for controlling emission of the ink from the print head in each of a plurality of single print passes of the print head;
to apply one or more filters to the first control signals to provide second control signals that control droplet sizes of the ink from a plurality of ink jet nozzles of the print head; and
to control motion of the print head to execute multiple passes of the print head across the print area along the first linear axis according to the second control signals in place of each single print pass according to the first control signals;
wherein the droplet sizes pursuant to the second control signals differ between the plurality of ink jet nozzles within a given print pass of the multiple passes of the print head along the first linear axis so as to reduce visual banding of the image to be printed.