US 12,130,575 B2
Determining the existence of point defects in print apparatuses
Michel Assenheimer, Nes Ziona (IL); Asaf Shoshani, Nes Ziona (IL); Naama Barak, Nes Ziona (IL); and Dorit Shalev, Nes Ziona (IL)
Assigned to HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Spring, TX (US)
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
Filed on Oct. 31, 2022, as Appl. No. 18/051,333.
Prior Publication US 2024/0142909 A1, May 2, 2024
Int. Cl. G03G 21/00 (2006.01); G03G 15/01 (2006.01)
CPC G03G 21/0094 (2013.01) [G03G 15/0163 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A print apparatus comprising:
a rotatable photoconductor having a photoconductive surface to receive a latent image representative of an image to be printed onto a printable substrate;
a charging component to apply a voltage to the photoconductive surface as the photoconductor rotates about an axis; and
processing circuitry to:
receive data indicative of a measurement of current resulting from the voltage applied by the charging component;
determine sample current values corresponding to respective rotation angle positions of the photoconductor about the axis;
filter the sample current values;
determine, responsive to detecting a spike in the filtered sample current values being greater than a threshold, that there exists a point defect affecting the latent image; and
generate instruction data responsive to determining that there exists a point defect affecting the latent image.