公开(公告)号：WO2021010987A1

公开(公告)日：2021-01-21

申请号：PCT/US2019/041986

申请日：2019-07-16

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： LEVY, Nathan A. ,  BENARI, Ron ,  PLOTKIN, Michael ,  BREEN, Craig ,  EMANUELI, Ron ,  LIVNE, Haim ,  ERLICH, Zvi

IPC: B41J2/44 ,  G03G15/00 ,  G02B26/10

Abstract: In an example, a method comprises: directing a sensing beam towards a reflective component of a print apparatus in a direction; detecting a reflected portion of the sensing beam at a detector comprising a two-dimensional sensing region; obtaining an indication of a location of the reflected portion of the sensing beam incident on the two-dimensional sensing region; and determining an orientation of the reflective component based on a correspondence between the location of the portion of the sensing beam on the two-dimensional sensing region and the direction of the sensing beam reflected by the component according to its orientation.

公开(公告)号：WO2020242498A1

公开(公告)日：2020-12-03

申请号：PCT/US2019/034983

申请日：2019-05-31

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： AMBAR, Oron ,  ERLICH, Zvi ,  VLADOMIRSKI, Haim ,  JODRA BARRON, Rodolfo

IPC: G03G15/10 ,  H04N1/034 ,  H04N1/407

Abstract: A light source adjustment apparatus is disclosed. The light source adjustment apparatus includes processing apparatus to receive a scanned image of a pattern printed by a print apparatus onto a printable medium, the pattern including a plurality of blocks of print agent of a first colour printed during a printing operation in which light sources of a light source array irradiate a photoconductive surface; analyse the scanned image to identify a region of non-uniformity within the plurality of blocks of print agent; correlate a location of the identified region of non-uniformity with a corresponding light source in the light source array; determine, based on the identified region of non-uniformity, an adjustment to be made to a parameter of the corresponding light source; and generate a signal to effect the determined parameter adjustment with regard to the corresponding light source. A method and a print apparatus are also disclosed.

公开(公告)号：WO2020242501A1

公开(公告)日：2020-12-03

申请号：PCT/US2019/035004

申请日：2019-05-31

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： AMBAR, Oron ,  ERLICH, Zvi ,  VLADOMIRSKI, Haim

IPC: G03G15/00

Abstract: A focus adjustment method is disclosed. The focus adjustment method includes depositing, using a print apparatus, print agent onto a printable substrate, the print apparatus comprising a photoconductive surface and a writing head having a first end and a second end, the writing head having an array of light sources to emit radiation onto the photoconductive surface during a printing operation. The method also includes during said depositing, moving the writing head relative to the photoconductive surface, between a first position and a second position, to create a printed image. The method also includes determining, based on the printed image, for each of a plurality of locations along the writing head, a position of the writing head relative to the photoconductive surface at which the writing head is most focussed. The method also includes calculating, using processing apparatus, a position of the first end of the writing head and a position of the second end of the writing head relative to the photoconductive surface at which the focus of the writing head at the plurality of locations is within a defined threshold. The method also includes adjusting the position of the first end of the writing head and the second end of the writing head relative to the photoconductive surface according to the calculated positions. A print apparatus and the machine-readable medium are also disclosed.