| 摘要 |
PURPOSE:To reliably detect a luminous material, by a method wherein light emitted from an object to be detected is converted into an electric signal, and light, corresponding to a specified color, of lights emitted from the object to be detected is converted into an electric signal. CONSTITUTION:A body 20 of the invention device is located in a position corresponding to a conveyance path 10, a detecting window 20a is formed in the body 20, and a mercury discharge lamp 21, serving an exciting light source, is situated in the body 20 corresponding to the detecting window 20a. In which case, light emitted from an object P to be detected such as mails is converted into an electric signal, and light, corresponding to a specified color, of lights emitted from the object P to be detected is converted into an electric signal, and this permits the reliable detection of a luminous material. |
