| 摘要 |
The invention comprises a unit (1) implemented with two elongate chambers (3, 4) provided with openings or gaps (7, 8) on one wall (5, 6). At one end of one chamber one or more LED (9) are adapted, and opposite hereto at the end of the other chamber there is arranged a receiving means (10). After one or more reflections by the reflecting walls of the first chamber (3) the radiation departs through the opening or gap (7) and after reflection by an object (13) on the outside returns through the gap (8) of the other chamber (4), to be reflected by the mirror walls of the chamber such as to strike the receiving means (10) after reflection. |
