US 12,130,572 B2
Determining the existence of defects in print apparatuses
Asaf Shoshani, Nes Ziona (IL); Lavi Cohen, Nes Ziona (IL); and Yaniv Yona, Nes Ziona (IL)
Assigned to HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Spring, TX (US)
Appl. No. 18/248,811
Filed by Hewlett-Packard Development Company, L.P., Spring, TX (US)
PCT Filed Oct. 13, 2020, PCT No. PCT/US2020/055364
§ 371(c)(1), (2) Date Apr. 12, 2023,
PCT Pub. No. WO2022/081139, PCT Pub. Date Apr. 21, 2022.
Prior Publication US 2023/0418198 A1, Dec. 28, 2023
Int. Cl. G03G 15/00 (2006.01)
CPC G03G 15/5037 (2013.01) [G03G 15/5054 (2013.01); G03G 15/75 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A print apparatus comprising:
a photoconductive surface to receive a latent image representative of an image to be printed onto a printable substrate;
a plurality of print components, each print component having a surface movable relative to the photoconductive surface, wherein a current or voltage is to be applied between the print component surface and the photoconductive surface;
a scanner to scan the printable substrate having the image printed thereon; and a processing circuitry to:
measure the current or voltage between each print component surface and the photoconductive surface;
responsive to detecting a deviation in the measured current or voltage from a reference current or voltage in respect of any of the plurality of print components, determine that there exists a defect associated with the photoconductive surface;
determine, based on an amount of the deviation of the measured current or voltage from the reference current or voltage, an indication of a size of the defect; and
determine, from a scan of the printable substrate, a location of the defect on the printable substrate and a corresponding location of the defect with respect to the photoconductive surface.