| 摘要 |
A system for analysing waves reflected from an LC resonant tag 1 is applied to detecting whether a part or an exchanged expendable supply mounted on a machine is a genuine part, that is, a genuine spare or replaceable part, for example, a photocopier toner cartridge 32. In this example, a scanner 11 can be installed near a cartridge chamber of a copier 31 and the tag 1 is attached to a genuine toner cartridge 32 to indicate that it is a genuine part. When the genuine cartridge 32 is mounted on the copier 31, the scanner 11 analyses the waves reflected by the tag 1 to judge that it is a genuine part, whereby the copier 31 may enter a standby state and display a message such as "YOU CAN MAKE COPIES". When the scanner 11 judges that a non-genuine cartridge is mounted, copier operation may be inhibited and a message such as "PLEASE REPLACE THE TONER CARTRIDGE" may be displayed. The reflected wave scanner 11 operates by transmitting sweeping electromagnetic waves and comparing these with received waveforms to detect the presence and resonant frequency of a tag 1 in the transmission field. The LC resonant tag 1 is constituted by an electrically conducting spiral pattern on surfaces of a dielectric film (fig. 2) and the detection involves phase difference detection (fig. 6) and resonance sharpness detection (fig. 7). Genuine part detection may be applied to automobile spare parts and cash dispenser parts to improve security. Other applications include determining history of attachment of cash dispenser parts for security purposes, a recyclable part having one or more tags 1 which are altered when recycled to enable the scanner 11 to judge how many times the part has been recycled, a tagged toy enabling voice or image responses to tag detection and a tagged security key allowing access to a communication network, e.g. a PC. |
