TIRE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a tire device whose size is compact.SOLUTION: An oscillation power generation element (11) for outputting voltage corresponding to oscillation generated on a tread of a tire included in a vehicle when the vehicle runs is included in the tire. The tire device estimates a state of the tire based on time change of the output voltage of the oscillation power generation element. The element for detecting oscillation also has a role to supply power for driving the device included in the tire. Therefore, a battery is not required additionally.