| 摘要 |
PURPOSE:To prevent an error from being produced, by applying magnetic paint on a nonmagnetic support and applying main magnetic force of lines of an oriented magnetic field from both sides of the running magnetic layer in the direction of running with a specific complementary angle while the paint is still wet, for uniformizing a reproduced output of the entire circumference of a magnetic disc. CONSTITUTION:A magnetic field is applied on the support 1 with orientation magnets 4, 4' from both sides of a magnetic recording material 3 provided with an undried magnetic substance layer 2. Most magnetic force of lines of the oriented magnetic field has a complementary angle theta (0<theta<90 deg.) in the direction of running of the recording material 3. Thus, the orientation of ferromagnetic fine powder of the magnetic layer 2 in the direction of running is corrected at its application, the reproduced output over the entire circumference of the disc is uniformized, the modulation (expressed in Equation, where A is an average output about 2,000 of magnetic flux inversion including the maximum output around one cycle of the track, and B is the average output including the minimum output) is minimized to increase the reproduced output for uniformizing. The support is punched to manufacture a magnetic flexible disc of high quality with good yield. |
