| 摘要 |
PURPOSE:To enable the conduction and interruption of current to be controlled by means of light by a method wherein the resistance of a photosensitive semiconductor element in a conducting state at the time of light irradiation is selected to be much lower than a gate resistance. CONSTITUTION:The figure furnishes an example of a photosensitive conductor element D inserted between a gate and a source in parallel therewith. When the element D is not radiated with light, the gate of an Si thyristor Q is impressed with -Vg to be interrupted. But when it is irradiated with light and brought into a conducting state, the Si thyristor Q is changed-over to the conducting state since the potential of gate becomes almost equal to that of a source. Resultantly, the resistance of the element D in the conducting state is selected to be much lower than the gate resistance Rg.
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