| 摘要 |
PURPOSE:To obviate the deterioration of the element itself in outdoor environment by transmitting the light from a light source through a light control body, guiding the light through an optical fiber to a photodetecting element and controlling the transmittance of the light control body by detecting the intensity of the transmitted light. CONSTITUTION:The light 8 of a laser or tungsten lamp or the like from the light source 7 passes the optical fiber 9 and transmits through the EC light control body 1, from which the light passes the optical fiber 10 and arrives at the photodetecting element 11. The element 11 which receives the light 8 sends the electric signal corresponding to the intensity of the received light to a transmittance calculating circuit 12. The data on the desired transmittance T1 is previously stored in a transmittance comparator 13 which transmits an electric charge from a driving circuit 6 via a power line 15 to color the EC light control body 1 of T1<T and to decolor the light control body 1 by the driving circuit 6 if T1>T. The light control body 1 can be controlled to the desired transmittance T1 by repeating this operation. The constitution in which the element is not installed outdoors is thereby enabled and the deterioration of the element in the severe outdoor environment is decreased.
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