| 摘要 |
<p>The present invention relates to a front door system which can grasp the situation behind a front door in the outside with a wide display in front of the indoor front door of each house. In order to be installed in front of the front door of each house, an image from a camera in the outside is displayed in the front door by making the image by projecting a beam through a mini projector onto the front door from a ceiling above the indoor front door. An infrared ray sensor, a CC camera, a light emitting light and a projector are installed on the indoor and outdoor ceiling. Thus, the situation behind the front door can be easily grasped by a relatively simple installation construction.</p> |
