| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an absorption type multilayer film ND (Neutral Density) filter chip having no burr-shaped defect, by removing a burr-shaped defect generated by press working of an absorption type multilayer film ND filter sheet without giving influence to an optical path part. SOLUTION: The absorption type multilayer film ND filter sheet is prepared by alternately layering oxide dielectric film layers and absorption film layers on at least one surface of a resin film, and the obtained absorption type multilayer film ND filter sheet is press-worked to obtain the absorption type multilayer film ND filter chip 20, and then the burr-shaped defect 21 of the resin film generated on a cut surface of the absorption type multilayer film ND filter chip 20 is melted and removed by flame treatment or infrared ray lamp treatment. COPYRIGHT: (C)2011,JPO&INPIT
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