| 摘要 |
PURPOSE:To prevent a read error from occurring during a read due to disturbance light by optically reading recording content displayed on an information recording sheet, etc., with eye confirmation and by making it possible to confirm the recording content by the naked eye during the read. CONSTITUTION:The reverse surface of sheet-shaped or plate-shaped information recording medium 4 where inputted information is displayed with eye confirmation by part 2 easily passing the read beam through and part 3 hardly passing it through is irradiated 6 with the read light, the reflected light of which is detected 7. Reflecting surface 9 reflecting this read beam is provided to the top surface of medium 4 and the inputted information is seen through half mirror 12 from the side opposite to read method 8. In the information input device like this, the spectrum component of the read beam is made different from that of a disturbance light striking photodetector 7 through half mirror 12 and the sensitivity of photodetector 7 is made low to the disturbance light and high to the reflected light of the read beam. |
