| 摘要 |
<p>The invention provides an image forming apparatus which requires only a little standby time at the time of shifting from a standby state to a usual operation state, and accordingly can reduce the required processing time. In a copy machine (2) employed in the invention, a scanner CPU (121) generates a timing signal with a number of clocks substantially equal to the number of clocks of a horizontal synchronization signal, thereby performing shading correction of the output of a CCD line sensor (24) using a shading correction circuit (126). The scanner CPU (121) counts clocks CKS, each of which is obtained by dividing, using the divider (168), the frequency of a reference clock CK by a predetermined value, and outputs a pulse signal as the timing signal substantially in synchronism with the output of a horizontal synchronization signal when the number of counted clocks CKS reaches a predetermined value. <IMAGE></p> |
