| 摘要 |
PROBLEM TO BE SOLVED: To clarify the position of the front door extension of a doorphone and capture the image of a visitor clearly when recognizing with a camera, when a front door light is not lit by lighting a light attached to the front door extension by sensing a body. SOLUTION: Body-sensing function and a surrounding illuminance sensing function are provided in the front door extension, and when the illuminance of the surroundings is lowered to a predetermined value, a visitor is sensed by the detection of the body of the visitor and a light attached to the front door extension is lit automatically.
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