| 摘要 |
<p>An optical level sensor (1) for an electric household appliance, including a tubular body (5) provided with a first open end (8) delimited on the inside of the tubular body by an annular edge (20) and a second open end (9), opposite to the first, being cup-shaped and closed by a lid (11); at least one photo-emitter diode (12), at least one photo-receiver diode (13) and electronic power supply and control means for the diodes, consisting of an electronic board (14) carrying the diodes (12,13) on-board and fixed to an internal face of the lid (11) facing the first open end in use; and a float (25) accommodated within the tubular body, floating between the first and second open ends (8,9); wherein the float has at least one first face (27) made to be only partially reflective and arranged facing the lid (11); in particular, the first face (27) and an internal side surface (7) of the tubular body (5) are white and the float (25) is made of polystyrene.</p> |
