Patent ID: 8159730
Filing Date: 2012-04-17
Classification: H04N

Abstract:
1. An image reading apparatus comprising: an original base plate on which a bundle of original sheets are mounted; a conveying unit which separates and conveys the bundle of original sheets sheet by sheet; a first image reading unit which reads image information from the one side of the original sheet conveyed by the conveying unit; a second image reading unit which reads image information from the other side of the original sheet; and a detecting unit which detects image existence/non-existence information of each original sheet in a state that the bundle of original sheets is mounted on the original base plate, wherein the detecting unit includes an oscillating unit which oscillates an electromagnetic wave of 30 GHz to 100 THz and a receiving unit which receives a reflected wave of the electromagnetic wave reflected on each side of the sheet, thereby detecting the image existence/non-existence information of each original sheet based on the received electromagnetic wave information.