| 摘要 |
PURPOSE: A doorbell system for the easy confirmation of a visitor location is provided to open a door lock of a place of a visitor more safely and easily. CONSTITUTION: Chime bells(20a-20d) are equipped together by corresponding to each door lock(10a-10d). Cameras(30a-30d) are installed together by corresponding to each door lock in order to confirm the outside visitor of corresponding door. A monitoring device(40) operates the door lock selectively while looking outside by a signal from cameras when a chime bell operates. A separate communication line is equipped except for signal wires for sounding chime bells between chime bells and a monitoring device. Sensors for detecting the operation of chime bells are equipped in communication lines.
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