Patent ID: 7969317

Claim:
An image forming apparatus comprising: an image forming unit configured to form images on a sheet; a casing made of an electromagnetic shielding member; a movable member configured to move from a position outside the casing to a position inside the casing upon contact of the sheet; a radio communication device disposed on the movable member and configured to communicate via radio waves; a sending and receiving unit configured to communicate via radio waves with the radio communication device; a shielding member arranged on the movable member, configured to shield the radio communication between the radio communication device and the sending and receiving unit in a state that the movable member is located within the casing; and a controller configured to determine the presence of the sheet by determining whether the sending and receiving unit can communicate with the radio communication device, wherein an opening is provided on the casing, and the movable member covers the opening in response to being pushed by the sheet to be conveyed.