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FUJI XEROX CO., LTD.

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US 20220091549 A1APPLICATION
G03G15/34

LIGHT-EMITTING-DEVICE HEAD AND IMAGE FORMING APPARATUS

Filed:2021-01-05Pub:2022-03-24
Applicant:FUJI XEROX CO., LTD.

A light-emitting-device head includes a first light-emitting-device arrangement including light emitting devices arranged in lines extending in a first scanning direction; a second light-emitting-device arrangement including light emitting devices arranged in lines extending in a first scanning direction, the second light-emitting-device arrangement overlapping the first light-emitting-device arrangement in a second scanning direction at least in part; an optical device that forms an electrostatic latent image by focusing light emitted from the light emitting devices on a photoconductor and exposing the photoconductor to the light; and a switching unit that switches the light-emitting-device arrangement to be lit up between the first light-emitting-device arrangement and the second light-emitting-device arrangement at a switching position defined at any position in an overlapping portion where the first light-emitting-device arrangement and the second light-emitting-device arrangement overlap each other. The electrostatic latent image is composed of dots formed by a screening process performed with a screen having a predetermined screen angle. The switching unit defines the switching position such that when points in the electrostatic latent image that coincide with the switching position are connected to one another by a line, the line forms a zigzag shape while overlapping some of the dots, the zigzag shape including a line segment extending at the screen angle.

US 20220091532 A1APPLICATION
G03G15/043

IMAGE FORMING APPARATUS AND LIGHT-EMITTING-DEVICE HEAD

Filed:2021-01-14Pub:2022-03-24
Applicant:FUJI XEROX CO., LTD.

An image forming apparatus includes a toner-image-forming unit that forms a toner image by using a first light-emitting-device arrangement and a second light-emitting-device arrangement in each of which light-emitting devices are arranged in lines extending in a first scanning direction, the second light-emitting-device arrangement overlapping the first light-emitting-device arrangement in a second scanning direction at least in part, and an optical device that forms an electrostatic latent image by focusing light emitted from the light-emitting devices on a photoconductor and exposing the photoconductor to the light; a transfer unit that transfers the toner image to a recording medium; a fixing unit that fixes the toner image transferred to the recording medium and finishes the image; a switching unit that switches the light-emitting-device arrangement to be lit up between the first light-emitting-device arrangement and the second light-emitting-device arrangement at a switching position defined at any position in an overlapping portion where the first light-emitting-device arrangement and the second light-emitting-device arrangement overlap each other; an acquiring unit that acquires information on density variation at the switching position in the image formed on the recording medium; and a correcting unit that corrects the density variation with reference to the information on density variation.