Toner container attachment detecting device and image forming apparatus

A toner container attachment detecting device for use in an image forming apparatus, the toner container attachment detecting device comprising:

• a reader-writer provided at an apparatus body of the image forming apparatus;
• a tag that is provided on a toner container removably attachable to the apparatus body and capable of containing toner and performs data communication of predetermined toner information with the reader-writer;
• a shutter made with an electrically conductive material and provided movably relative to the apparatus body between an open position where the shutter is kept from influencing a carrier wave radiated from an antenna of the reader-writer and a covering position where the shutter underlies across the antenna to influence the carrier wave radiated from the antenna;
• a first displacing portion that is provided on the toner container and displaces, upon attachment of the toner container to the apparatus body, the shutter from the covering position to the open position;
• and
• a second displacing portion that displaces, upon removal of the toner container from the apparatus body, the shutter from the open position to the covering position,
• the reader-writer comprising:
• the antenna;
• a carrier wave generating section that generates a carrier wave to be radiated from the antenna;
• a radio field intensity detecting section that detects a radio field intensity of the carrier wave radiated from the antenna;
• and
• a determining section that determines, based on a detection result of the radio field intensity detecting section, whether or not the toner container is attached to the apparatus body,
• wherein the shutter is grounded.