MAGNETIC TAPE INSPECTION METHOD AND MAGNETIC TAPE INSPECTION DEVICE

摘要

PURPOSE: To provide a magnetic tape inspection method and a magnetic tape inspection device capable of surely inspecting defects caused by the scars, stains, defective shapes, foreign matter on the surface of a magnetic tape at a high S-N ratio. ;CONSTITUTION: When a sensor head 10 is arranged to face a traveling magnetic tape 13 to optically inspect the surface, the optical axis direction of the sensor head 10 is tilted by 5-9.5° relative to the normal line of the principal plane of the magnetic tape 13. When the optical axis of the sensor head 10 is tilted by 5-9.5° against the vertical direction, the signal output caused by a defect section is made relatively larger than the noise component, and it is detected at a high S-N ratio. The sensor head 10 is provided with a light projection section and a light reception section, light is applied from the light projection section, and the reflected light from the magnetic tape 13 is detected by the light reception section. The light projection section and light reception section are made of an optical fiber, for example.;COPYRIGHT: (C)1996,JPO