IMAGE FORMATION DEVICE

PROBLEM TO BE SOLVED: To provide an image formation device which can correct each color image position in a high precision. SOLUTION: A control circuit 60 generates an image start signal at the time of image formation. Simultaneously, the control circuit 60 detects a signal from a recording medium leading end detecting sensor 68, and then generates a vertical scan synchronizing signal based on the image start signal. At this time, the vertical scan synchronizing signal is generated at a timing where a relative position deviation between colors (color registration) becomes minimum, by using a main scan synchronizing signal for a high-speed resolution mode. In other words, until the control circuit 60 generates the vertical scan synchronizing signal, an LD driver 66 is controlled so that the main scan synchronizing signal for a high-speed high-resolution mode is outputted from an SOS sensor 50. Moreover, the LD driver 66 is controlled to obtain the main scan synchronizing signal of a resolution mode at the image formation time after the control circuit 60 generates the vertical scan synchronizing signal. Also a phase of the main scan synchronizing signal is controlled according to the resolution mode to control so that absolute positions of images of each color to a recording medium agree with each other. COPYRIGHT: (C)2005,JPO&NCIPI