| 摘要 |
<p>A coin sensor, such as a post acceptance sensor for a coin validator, at a coin sensing station (12) on a coin path (10) having a sidewall (16), includes optical source and detector pairs (13a, 14a; 13b, 14b) that detect the presence of the coin by reflection of source radiation to the detector by the coin's surface. In order to improve sensitivity the side wall has an angled surface configuration (20) which exhibits reflection of radiation from each source (13a, b) to the detectors (14a, b) in the absence of a coin.</p> |
