| 摘要 |
PCT No. PCT/GB93/02582 Sec. 371 Date Jul. 14, 1995 Sec. 102(e) Date Jul. 14, 1995 PCT Filed Dec. 17, 1993 PCT Pub. No. WO94/15322 PCT Pub. Date Jul. 7, 1994.A coin sensor, such as a post acceptance sensor for a coin validator, at a coin sensing station on a coin path having a sidewall, includes optical source and detector pairs 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 which inhibits reflection of radiation from each source to the detectors in the absence of a coin.
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