Patent ID: 8467110
Filing Date: 2013-06-18
Classification: H04N

Abstract:
1. An image reading apparatus, comprising: a document placing unit on which a document is placed; a light source unit in which light sources are arrayed in a depth direction; a light source drive unit that drives the light sources; a light source control unit that controls, when a document size is to be detected, the light source drive unit so that the light sources are divided into a plurality of groups to be driven; an image sensor arranged at a position capable of receiving light emitted from the light sources and reflected by the document on the document placing unit; a detection unit that detects the document size through detection of a position of an edge of the document from an output signal from the image sensor, wherein detecting the document size comprises the light source control unit activating a first group of light sources and deactivating a second group of light sources other than the first group of light sources; and a reading control unit that controls the light source drive unit so that, when the image is to be read, the light sources are activated to illuminate the document.