| 摘要 |
PROBLEM TO BE SOLVED: To provide an entrance door or a door through which it can be distinguished whether a person existing in the front of the door is a real home deliverer or a criminal who impersonates a deliverer before opening the door and a home delivery object (parcel) can be safely delivered without opening the entrance door or the door.SOLUTION: A small window 2 of about 30 cm square is mounted in a door 1. Since the door 1 is provided with the small window 2, it can be distinguished who is a person existing in the front of the door 1 from an inside of the door, delivery can be performed, and there is no need to open the entrance door 1 or a door. Furthermore, entry into the room by a criminal becomes difficult and crimes are drastically reduced probably in future. |
