| 摘要 |
A switch position indicating device comprises a member 9, e.g. a disc, attached to the operating element 2, e.g. a rotor shaft, of a switch and having either a number of holes or reflective markers to pass or reflect light emitted from the ends of optical fibres 15, 18, 20 to receivers 16, 19, 23, also comprising optical fibres to indicate the switching position of the switch. The ends of the fibres can be plugged into an apertured plate 10 aligned with the disc 9 in a predetermined coded pattern related to the switching positions. <IMAGE>
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