| 摘要 |
PURPOSE:To detect surely marks by irradiating the light from a light source to a measuring object through a beam splitter and an object lens and leading the reflected light to a line sensor and outputting a detection signal only when a mark is detected. CONSTITUTION:A mark sensor consists of a light source 1, a lens 2, a beam splitter 3, an object lens 4 having a large diameter, a cylinder lens 7, a line sensor 8, a control line 9, and an output circuit 10. A measuring object 5 with a mark 6 is set so as to be fed at certain speed. When the light from the light source 1 is irradiated to the measuring object 5 and the mark 6 through the beam splitter 3 and the object lens 4, the reflected light is made incident on the line sensor 8 through the beam splitter 3 and the cylinder lens 7 and is processed by the output circuit 10 to detect variation of the angle of inclination of the surface of the measuring object 5, and the detection signal is outputted only when the mark 6 is detected, and thus, the mark 6 is detected surely even if the color of the measuring object 5 is changed. |
