| 摘要 |
<p>A plurality of optical guide paths (21, 22) are built in a guide path plate (1). A plurality of optical guide posts (61,62) are erected on the guide path plate (1) so that each may oppose to one end of the corresponding optical guide path (21,22). The other end of at least one (21) of the optical guide paths is optically connected to a light projecting portion (3), and the other end of at least another one (22) of the optical guide paths is optically connected to a light receiving portion (4). A part (5) to-be-sensed which is movable is located between the distal ends of the optical guide posts (61, 62) whose base ends are connected to the corresponding optical guide paths (21, 22). The presence of the part (5) to-be-sensed is detected in such a way that the part (5) interrupts or transmits light which passes between the distal ends of the optical guide posts (61, 62).</p> |
