| 摘要 |
PURPOSE:To obtain a small-sized sensor requiring no memory and receiving no adverse effect due to the oblique running of a manuscript, by simultaneously receiving reflected lights from the parts to be inspected of the manuscript by two light receiving elements. CONSTITUTION:The light from red LED 2 passes through a cylindrical lens 7 and an aperture 14 to irradiate the surface to be inspected of a manuscript 1 and the reflected light passes through the aperture 14 and a red-pass filter 8 to be received by a light receiving element 9. The light from green LED 3 passes through the lens 7, the aperture 14 and a green-pass filter 10 to be received by a light receiving element 11. By this method, the reflected light from the respective points of the surface to be inspected of the manuscript 1 are simultaneously received by the elements 9, 11. Therefore, not only a memory for holding a signal becomes unnecessary but also it is unnecessary to accurately perform the adjustment of the distance between two inspection points and the control of the moving speed of the manuscript and, further, even when the manuscript runs obliquely, hue discrimination can be performed without trouble.
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