| 摘要 |
Provided is either a device with which even a microscopic protrusion of a core material between the core material and a low surface reflectivity material which is layered on both sides thereof is detected with high precision and the end face of a layered sheet material is inspected, or a device with which a microscopic core material burr which is embedded in an activated material, etc., of a cross-section face of a type-II battery electrode sheet material is detected with high precision and inspected. Specifically, a layered sheet material end face inspection device comprises an observation unit, a light source unit, an image recording unit, and a protrusion detection unit. The observation unit is positioned to allow observation of the end face from a direction which is approximately orthogonal to a ridgeline of a core material end part upon an extended line of the primary face of the sheet material. The light source unit is configured to include: a first light source unit which is positioned to project light forming a first primary face-side incidence angle (alpha1) which is inclined toward a first primary face side with respect to an observation optical axis which joins the observation unit and a region to be observed; and a second light source unit which is positioned to project light forming a second primary face-side incidence angle (alpha2) toward a second primary face side with respect to the observation optical axis which joins the observation unit and the region to be observed. |
