PROBLEM TO BE SOLVED: To provide an inspection device 1 for easily inspecting an overlapping state of a sheet where a plurality of films 35a and 34 are layered.SOLUTION: The inspection device 1 where the plurality of films 35a and 34 of different size are layered has: an illumination part 4 for irradiating the sheet with illumination light 4a a polarizer 5 for polarizing and transmitting the illumination light 4a and an analyzer 6 for polarizing and transmitting the illumination light 4a that has transmitted the polarizer 5 and the sheet. On the basis of luminance or color of the illumination light 4a transmitting the analyzer 6, an overlapping state of the films 35a and 34 is inspected. Moreover, the inspection device has an imaging part 8 for imaging the illumination light 4a transmitting the analyzer 6 as an image of the sheet and a detection part 9 for detecting a bad quality of the sheet according to the overlapping state of the films 35a and 34 based on the luminance or color of the image of the sheet.COPYRIGHT: (C)2013,JPO&INPIT【課題】複数枚のフィルム35a、34が重ねられたシートのその重なりの状態を容易に検査可能な検査装置1を提供する。【解決手段】大きさの異なる複数枚のフィルム35a、34が重ねられたシートの検査装置1であって、照明光4aをシートに照射する照明部4と、照明光4aを偏光して透過させる偏光子5と、偏光子5とシートを透過した照明光4aを偏光して透過させる検光子6とを有し、検光子6を透過した照明光4aの輝度又は色に基づいて、フィルム35a、34の重なりの状態を検査する。そして、さらに、検光子6を透過した照明光4aをシートの像として撮像する撮像部8と、シートの像の輝度又は色に基づくフィルム35a、34の重なりの状態から、シートの不良を検出する検出部9とを有する。【選択図】図5
