| 摘要 |
<p>PURPOSE:To prevent the leakage and electric shock at a place with much moisture by selectively reflecting a light from a display optical fiber to a load controlling optical fiber. CONSTITUTION:When a light is instantaneously emitted from a controlling optical fiber 30 to a photothyristor 18, a current of an arrow flows through contacts 9-8 to a relay coil 5, a switch 3 is closed, and a power is supplied to a load 4 and a switch 7 is changed to a contact 8-10. At this time a light emitting diode 28 emits a light, and a display output is fed out through a display optical fiber 33. When a photothyristor 19 is then fired by the light emitted from a controlling optical fiber 31, a current reverse to the arrow flows through the coil 5 in the same manner as above, the switch 3 is opened, the diode 27 emits a light, and a display output if fed out through a display optical fiber 32. The lights from the fibers 32, 33 are reflected, and is applied to the fibers 30, 31, thereby controlling electrical energization and de-energization.</p> |
