Marvell International Limited

Gregory Lee Unruh

Douglas G Keithley

An image forming apparatus performs periodic line based image transformation in order to correct for irregularities in a mirror and for mechanical disturbances that may occur during the rotation of the mirror. The irregularities of the mirror and the mechanical disturbances that occur during the rotation of the mirror may be measured at installation or may be measured during an operation of the image formation apparatus. The characteristics of the mirror are stored as configuration data, which is referenced by a direction of rotation. The image forming apparatus adjusts image data according to the configuration data. The adjustment may occur through data manipulation in stored image data. Alternatively, the adjustment may occur through the control of a pixel rate used to modulate the image data into a transmitted laser beam. The image data may be received by a host device or the image data may be generated by a scanner.

Oscillating mirror line based image transformation

Methods and apparatuses that facilitate the alignment of multiple color planes of a latent image in a multi-beam multi-pass printer. The methods include determining, during a first pass of a transfer medium of a multi-beam printer, a first time interval between when at least one light beam from a multi-beam device is detected and when a top of a page is detected at a selected location of the transfer medium, the multi-beam device including a plurality of light beam sources, and the first pass to form a first color plane of a latent image on the transfer medium. The methods further include selecting, based at least in part on the determined first time interval, a first one of the plurality of light beam sources to begin illuminating the transfer medium to create the first color plane on the transfer medium during the first pass of the transfer medium.

Alignment of color planes in multi-beam multi-pass printers

A method includes providing pixel data that comprises lines of pixel data and shared lines of pixel data, where the shared lines of pixel data are configured such that a first laser and a second laser of a plurality of lasers within a laser printing arrangement will print the shared lines of pixel data during printing of an image on a print medium. The shared lines of pixel data are split between the first laser and the second laser such that two shared lines of pixel data allow for printing of a single line of the image to be printed. During printing, the first and second lasers fire in accordance with lines of the shared lines of pixel data, where the firing of the second laser begins printing of lines of the image and the firing of the first laser completes printing of lines of the image.

Systems and methods for laser spacing compensation in laser printing devices

Methods and apparatuses that facilitate the alignment of multiple color planes of a latent image in a multi-beam multi-pass printer are described herein. The novel methods includes determining, during a first pass of a transfer medium of a multi-beam printer, a first time interval between when at least one light beam from a multi-beam device is detected and when a top of a page is detected at a selected location of the transfer medium, the multi-beam device including a plurality of light beam sources, and the first pass to form a first color plane of a latent image on the transfer medium. The methods further include selecting, based at least in part on the determined first time interval, a first one of the plurality of light beam sources to begin illuminating the transfer medium to create the first color plane on the transfer medium during the first pass of the transfer medium.

Allignment of color planes in multi-beam multi-pass printers

Systems and methods are disclosed for determining and generating horizontal synchronization signals for a laser printer having a multi-facet rotating mirror. Each horizontal synchronization signal is determined based on measurements of the facets. The measurements are reflective of the configuration of the mirror and may be acquired using one horizontal synchronization sensor. Respective pseudo horizontal synchronization signals may be generated for multiple emitters based on the measurements obtained with the single horizontal synchronization sensor.

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Boise, ID, United States of America

Gregory Lee Unruh