Patent ID: 7012246

Claim:
An imaging apparatus for forming an image on a photoconductive substrate, comprising: a first laser emitting a first light beam; a second laser emitting a second light beam; a scanning device for reflecting said first light beam and said second light beam; an HSYNC detector positioned to receive at least one of said first light beam and said second light beam; and a controller communicatively coupled to said first laser, said second laser, said scanning device and said HSYNC detector, said controller being configured to perform actions including: (a) controlling said first laser, said second laser and said scanning device to simultaneously scan said first light beam and said second light beam across an image region of said photoconductive substrate over a plurality of scans to form a latent image on said photoconductive substrate; (b) activating only said first laser outside said image region between first successive scans of said plurality of scans to sense with said HSYNC detector said first light beam; (c) activating only said second laser outside said image region between second successive scans of said plurality of scans to sense with said HSYNC detector said second light beam; and (d) alternating between performing action (b) and action (c) between further successive scans during said forming of said latent image.