Method for inspecting magnetic disk cartridge

A method for inspecting a magnetio disk cartridge, wherein the state, with which an adhesive agent has been applied as an annular layer onto a flange of a center hub in order to adhere a magnetic disk body and the flange of the center hub to each other, is inspected,

• the method for inspecting a magnetic disk cartridge comprising the steps of:
• i) irradiating a collimated light beam to a cross section of the layer of said adhesive agent, which cross section is taken in the radial direction of said center hub, from a direction which is parallel to the surface of said flange and which is perpendicular to said cross section of the layer of said adhesive agent, said collimated light beam having a beam diameter such that the whole cross section may be included in the beam diameter,
• ii) detecting the amount of the collimated light beam, which has passed through the region in the vicinity of said flange,
• iii) calculating the area of said cross section of the layer of said adhesive agent from the detected amount of the collimated light beam, which has passed through the region in the vicinity of said flange, and
• iv) inspecting the amount of said adhesive agent, which has been applied onto said flange, from the results of the calculation.