| 摘要 |
PROBLEM TO BE SOLVED: To provide a coin diameter detecting apparatus having simple structure and requiring no line sensor. SOLUTION: The coin diameter detecting apparatus is provided with: a light irradiation means which is arranged under a coin conveyance path surface and irradiates a coin conveyed through a light transmission part formed on the coin conveyance path surface with light; a light receiving means which is arranged over the coin conveyance path surface and receives light which is not shielded by the conveyed coin out of light passing through the light transmission part; and a control part for determining a diameter of the coin based on relationship between a maximum light receiving quantity when the coin does not pass and a minimum light receiving quantity when the coin passes through the light transmission part. The light transmission part is provided with notches formed on both sides from both side ends of the coin conveyance path surface to the inside at a prescribed angle from the width direction of the coin conveyance path surface, the light irradiation means is constituted of parabolic mirrors and light sources arranged on focal points of the parabolic mirrors and irradiates the light transmission part with parallel light, and the light receiving means is constituted of parabolic mirrors and light receiving sensors arranged on the focal points of respective parabolic mirrors and receives light by converging parallel light passing through the light transmission part into the focal points of respective parabolic mirrors. COPYRIGHT: (C)2009,JPO&INPIT
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