| 摘要 |
PURPOSE:To effect cost down, by installing in a light-receiving system of reflected light from a cylindrical specimen a frame provided with nearly the same curvature as the external curvature of the specimen and attaching to this frame a light guide leading the reflected light to a photoelectric sensor. CONSTITUTION:Parallel light fluxes from a light projecting system constructed with a source 1, such as a light emission diode, etc., cylindrical lens 2, and lens 3, etc. are projected on a cylindrical specimen A and their reflected light is received by a photoelectric sensor 7 composed of a linear self-scanning type image sensor through the light-guide imbedded in a frame 5 provided with a curved surface 4 of the same curvature as the external surface curvature of the specimen A. By this arrangement, distance between the specimen A and light-receiving end of the light-guide 6 remains constant in all positions and automatic conversion from a circle to a straight line is performed and accordingly, significant simplification of data processing can be accomplished. |
