Patent ID: 9158224
Filing Date: 2015-10-13
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit to perform printing using a light source unit and a photosensitive medium; a registration unit to adjust an exposure time to correspond to a change in a power of a light source when the power of the light source changes; and a controller to control the image forming unit to perform printing according to the adjusted exposure time, wherein the image forming unit comprises the light source unit including a plurality of light sources, the image forming unit generating a plurality of horizontal synchronization signals to determine the exposure time, wherein the registration unit changes a power of a second light source while a power of a first light source is fixed, and senses a change in a time difference between a first horizontal synchronization signal generated from the first light source and a second horizontal synchronization signal generated from the second light source with respect to a change in the power of the second light source, as a variation in the horizontal synchronization signal.