| 摘要 |
PURPOSE:To avoid flare phenomenal by moving a reflecting mirror from the position of convergence of accelerated phosphorescence light and setting free. CONSTITUTION:The reflecting mirror 14 is made movable vertically between a position at which the reflecting mirror 14 reflects the accelerated phosphorescence light to a photoelectric reading device and a position where it does not reflect reflected excitation light 2b reflected from an accumulative fluorescent body sheet 10 to the sheet 10. Normally, the reflecting mirror 14 is positioned at a place where it reflects accelerated phosphorescence light to the photoelectric reading device to exhibit huncrions of the reflecting mirror. When lowering of flare phenomnal is more important, the reflecting mirror 14 is positioned at a place where excitation light 2b reflected from the sheet 10 is not reflected to the sheet 10. Thus, flare phenomenal are avoided and its contrast can be improved.
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