| 摘要 |
<p>PURPOSE:To make the amount of emission of each dot of LED uniform and thereby to eliminate the occurrence of nonuniformity in density appearing in a print, by providing an LED drive timing control element which controls a drive time of each LED on the basis of the nonuniformity in the amount of the emission of each dot of the LED. CONSTITUTION:An LED print head has a lined-up LED array 4, an image data receiving element 3, an LED drive timing control element 2 and an LED driving element 1. The nonuniformity in the amount of emission of each dot of LED is classified beforehand, and the drive timing control element 2 is connected to an AND gate input terminal (a) of the LED driving element 1 through any one of drive lines A to C selected in accordance of a classification value. Thereby the drive timing control element 2 outputs to the LED driving element 1 an instruction to control a drive time to be long for LED connected thereto and having a small amount of emission and to be short for LED connected thereto and having a large amount of emission, and based on said instruction, each LED dot is driven in the LED driving element 1, so as to make the amount of emission uniform.</p> |
