| 摘要 |
PURPOSE:To uniformly guide light from paper leaves, etc., to respective photodetectors, and to improve the stability of circuit operation, by arranging the photodetectors in the carriage direction of the paper leaves, etc. CONSTITUTION:On the internal bottom of a diffusing mirror box 21, photodetectors 22... are arrayed in the carriage direction of paper leaves P, etc., (such as document). Light with which the leaves P, etc., is irradiated from a light source 1 is reflected by the leaves P, guided into a diffusing mirror box 21 through a condenser lens 2 and a slit 3, and then diffused before being guided to the photodetectors 22.... Consequently, the reflected light from the same visual field of the leaves P is separated into three color components differing in wavelength and pieces of information on them are read to discriminate the kind of the paper leaves, etc. |
