US 11,654,674 B2
Print medium for generating printhead alignment data
Nigel Hoschke, North Ryde (AU); Rodney Hardy, North Ryde (AU); and Steven Parker, North Ryde (AU)
Assigned to Memjet Technology Limited
Filed by Memjet Technology Limited, Dublin (IE)
Filed on Mar. 31, 2022, as Appl. No. 17/710,633.
Application 17/710,633 is a continuation of application No. 16/736,348, filed on Jan. 7, 2020, granted, now 11,312,126.
Claims priority of provisional application 62/790,883, filed on Jan. 10, 2019.
Prior Publication US 2022/0219449 A1, Jul. 14, 2022
Int. Cl. B41J 2/045 (2006.01); B41F 33/00 (2006.01); B41J 29/393 (2006.01)
CPC B41J 2/04505 (2013.01) [B41F 33/0081 (2013.01); B41J 29/393 (2013.01); B41J 2029/3935 (2013.01); B41J 2202/20 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A system for identifying nozzle misalignments in a printhead, the system comprising:
the printhead; and
a print medium having a calibration pattern printed thereon using the printhead, the calibration pattern comprising one or more rows of spaced apart fiducials, each fiducial comprising a plurality of concentric annuli representing a Barker code,
wherein the Barker code comprises a code sequence having a sequence of N code values, each value being represented by a presence or absence of an annulus at a predetermined distance from a centre of the fiducial, and where N is an integer from 3 to 20.