Hewlett-packard Development Company, L.P.

Zvi Erlich

Haim Vladomirski

Oron Ambar

Rodolfo Jodra Barron

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.

Adjusting print apparatus light sources

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.

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Ness Ziona, Israel

Zvi Erlich