| 摘要 |
PURPOSE:To obtain a light source at a low cost wherein irregularity of illuminance is little and illuminance characteristics in the width direction of a manuscript is excellent, by forming coating resin so as to cover a light emitting diode and almost coincide with the outer periphery of a light reflecting film. CONSTITUTION:The light from a light-emitting diode 3 formed on a linear light source 14 is reflected by a manuscript 15. The reflected light having differnt intensity according to whether characters are present is converted into an electric signal by a photodetectior 16, which signal is converted into a data signal. The light outputted from a light-emitting diode 3 is scattered downward by reflection at the rough surface of coating resin 8, and most of it is absorbed by light absorption films 12, 13 formed on the periphery of the coating resin 8. The reflected light 17 (flare light) becomes weak and is outputted. Hence the range wherein the coating resin comes into contact with a light reflecting film becomes constant, irregularity of the form of the coating resin becomes little, and irregularity of illuminance is reduced. |
