| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely detect a predetermined motion made for a door handle by a user. <P>SOLUTION: This door handle 5b includes a transmission antenna device 1, and a shield electrode 7 which is arranged in a predetermined direction and which suppresses a change in capacitance when the human body gets close to it from a predetermined direction. The transmission antenna device 1 is equipped with a transmission antenna part 3 which includes a magnetic body core 9 and a coil 10 wound around the magnetic body core 9 and which generates a signal wave. In the transmission antenna device 1, capacitance detection electrodes 11a and 11b, which are formed in such a shape as to cover the transmission antenna part 3 and which change the capacitance when the human body gets close to the capacitance detection circuit, are provided with a capacitance sensor part 2 to which a capacitance detection circuit for detecting the change of the capacitance is electrically connected and which is coupled to the transmission antenna part 3 in the direction of the longitudinal axis of the magnetic body core 9. In addition, the transmission antenna device 1 is provided with an auxiliary electrode 4 which is arranged in the capacitance sensor part 2 in the state of being separated from the capacitance detection electrodes 11a and 11b and which is formed in such a shape as to cover the transmission antenna part 3. <P>COPYRIGHT: (C)2010,JPO&INPIT |
