| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a door device and a smart entry system having this door device for detecting opening-closing operation by using a piezoelectric sensor for providing sufficient detecting sensitivity even by the light touch with a flexible structure. <P>SOLUTION: The piezoelectric sensor 4 can be flexibly attached to a door knob 3, and can detect micro-displacement of the door knob 3 with high sensitivity. Thus, sufficient signal output is provided only by touching the door knob 3, and the touch with the door knob 3 can be detected. Since there is no need to reveal an electrode, disturbance and influence such as sticking dust-dirt, rain and snow are hardly received. Since the piezoelectric sensor 4 can be flexibly deformed, a restriction condition of an installation place is reduced, and an arranging space is also reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
