| 摘要 |
PROBLEM TO BE SOLVED: To detect the pneumatic pressure, the temperature or the like of a tire by supplying power from the outside via electromagnetic waves without using a battery. SOLUTION: A new power supply source of a tire pneumatic pressure/temperature detector having a power supply source of a known battery is replaced by electromagnetic waves having predetermined frequency bands through power transmission/reception by using an external antenna 90 installed outside a tire 60 and an internal antenna provided inside a valve 70 of the tire 60. If the electromagnetic waves having the frequency bands are matched with a physical structure and an electric structure of the tire 60, a magnetic field component is distributed in the direction substantially normal to a plane including the maximum diameter of the tire 60 in a space between the tire 60 and a wheel 53. When the internal antenna is set to the maximum magnetic field receiving direction, substantially consistent power can be received even if the tire 60 is turned or stopped at any position. COPYRIGHT: (C)2007,JPO&INPIT |
