Patent ID: 8823819

Claim:
A coating pattern measuring apparatus for measuring a dimension of a coating portion formed on a sheet-shaped base material, the apparatus comprising: a camera holding mechanism that is disposed perpendicular to a transportation direction of the sheet-shaped base material; at least one camera that is held by the camera holding mechanism and is disposed such that the at least one camera is movable in a longitudinal direction of the camera holding mechanism; a rotation mechanism that rotates the camera holding mechanism by θ degrees to rotate the at least one camera from a first image pickup position at a first position at which the coating portion is formed on the sheet-shaped based material to a second image pickup position at a second position, wherein the at least one camera is focused at the same object distance at the first image pickup position and the second image pickup position; a scale for calibration that is disposed at the second image pickup position of the at least one camera and is disposed perpendicular to the transportation direction of the sheet-shaped base material and whose image can be picked up by the at least one camera, the scale for calibration extending across the entire width of the sheet-shaped base material and the scale for calibration not being disposed at the first image pickup position; and an image processing computer that processes an image picked up by the at least one camera, wherein the relationship between a pixel of the at least one camera and a position on the sheet-shaped base material is determined with reference to a picked up image of the scale for calibration.