| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel method of evaluating light-shielding performance suitable for actual use in order to improve a case that the light-shielding performance is not sufficient for the reasons of: strength of light even if using a first class light shielding curtain having a light-shielding rate of not less than 99.9% measured by a method A of a light-shielding performance test method defined by JIS-L-1055; light leaked from pin holes and texture points of the curtain; and obliquely entering leaked light that cannot be evaluated by the method A only for light in one direction from straight above. <P>SOLUTION: A method of evaluating light-shielding performance of a light-shielding curtain 3, comprises: placing the light-shielding curtain 3 on an electric light-irradiated panel 3 in a dark room 1; and comprehensively determining the appearance of overall transmission of light, and the presence or absence and the amount of light leakage from pin holes and texture points. <P>COPYRIGHT: (C)2013,JPO&INPIT |
