Patent ID: 8310513
Filing Date: 2012-11-13
Classification: B41J,G02B,G03G,G06K,H04N

Abstract:
1. A light-source driving device used for driving a plurality of light-emitting units in an optical scanning device that optically scans a surface to be scanned with light fluxes emitted from the plurality of light-emitting units in a main scanning direction, the light-source driving device comprising: a high-frequency clock generating circuit that generates a plurality of high-frequency clock signals having mutually different phases; a write-data creating circuit that creates a plurality of write data corresponding to the plurality of light-emitting units according to image information; and a modulated-data control circuit that creates a plurality of modulated data corresponding to the plurality of light-emitting units from the plurality of write data based on at least one of a relation between an array of the plurality of light-emitting units and an array of a plurality of light spots formed on the surface to be scanned and a relation between the surface to be scanned and the main scanning direction, and separately controls output timings of the plurality of modulated data using a time, as a unit, corresponding to a phase difference between the plurality of high-frequency clock signals, wherein the modulated-data control circuit includes: a control circuit that controls a correspondence relation between the plurality of light-emitting units and the plurality of modulated data based on the relation between the array of the plurality of light-emitting units and the array of the plurality of light spots and the relation between the surface to be scanned and the main scanning direction, a correction-data acquiring circuit that separately acquires an amount of shift between start timings of write to the surface to be scanned as correction data including data in which the time corresponding to a phase difference between the plurality of high-frequency clock signals is set as a unit, and an adjusting circuit that separately adjusts output timings of the plurality of modulated data using the phase difference, as a unit, of the plurality of high-frequency clock signals based on the correction data acquired by the correction-data acquiring circuit so that the start timings of write to the surface to be scanned match each other; and wherein the light-source driving device further includes a driving circuit that drives the plurality of light-emitting units based on the plurality of modulated data output from the modulated-data control circuit.