| 摘要 |
PURPOSE:To detect the continuous change in position of a body to be checked, by receiving light by a light receiving fiber bundle having a light receiving surface, which is formed by arranging many optical fibers having the same diameter so that they are closely contacted in a zigzag latticed shape or in a matrix shape in a rectangular form, and converting the light into an electric signal in correspondence with the amount of the received light by a photoelectric converter. CONSTITUTION:When one end surface of a body 4 is not present in a light path between a light source 1 and a light receiving fiber bundle 10, the output of a photoelectric converter 3 indicates the maximum level and becomes constant. When one end surface of the body 4 reaches one end of the light path between the light source 1 and the light receiving bundle 10, the output of the level of the output of the photoelectric converter 3 is decreased as the body to be checked 4 moves the light path between the light source 1 and the light receiving fiber bundle 10. When the one end surface of the body 4 reaches the final end of the light path between the light source 1 and the light receiving fiber bundle 10, the direct light from the light source 1 to the light receiving fiber bundle 10 is shielded by the body 4, and the output of the photoelectric converter 3 becomes the minimum level (0 level). |
