Space Charge behavior in polyimide film under dc stress with visible light irradiation was investigated out using a newly developed measurement system of the pulsed electro-acoustic (PEA) method. The PEA method has been widely used to observe a space charge distribution in various solid insulating materials. We applied the method to investigate the influence of visible light irradiation on space charge formation in insulating materials under DC stress. It is well known that a property of the conduction in insulating materials is affected by the irradiation of light. However the relationship between the space charge and the irradiation of light has not been clear yet. So, we have observed the effect of the light irradiation on the space charge distribution in polyimide film. In this research, we have found that the space charge formation and the decrease of breakdown strength depends on chemical structure and fundamental absorption of the polyimide.
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