| 摘要 |
<p>A vibration generator (10) is provided with a contact part (11) and a contact vibration part (13). The vibration generator (10) is installed in a staple box (c) of an entrance door. When a deadbolt (a) of the entrance door is displaced from an unlocked position to a locked position due to a locking operation by an operator, the contact part (11) and the deadbolt (a) make contact. The contact vibration part (13) generates a vibration of a prescribed frequency by using energy resulting from the displacement of the deadbolt (a) transmitted due to the contact part (11) and the deadbolt (a) making contact.</p> |
