| 摘要 |
PROBLEM TO BE SOLVED: To improve the convenience property by requiring no manual locking or unlocking action, and automatically locking or unlocking a door. SOLUTION: A transmitter 1 intermittently transmits the ID inherent to a device generated by an ID generation section 5 through an intermittent transmission section 6 and an antenna 7. A controller 2 receives the radio wave through an antenna 8 and a reception section 9, and it compares the demodulated ID with the ID stored in advance. If they coincide, the received field intensity is strong and a user approaches the door of an automobile, and the door of the automobile is unlocked. If the demodulated ID is noncoincident with the ID stored in advance, the received field intensity is weak, the user leaves the door of the automobile, and the door of the automobile is locked. |
