JPS5473605A - Azimuth recording method using double film - Google Patents

Abstract

PURPOSE:To prevent from picking up other signal when reading out one signal due to azimuth loss, by providing double film medium having low coercive force film in the upper layer and high coercive force film in the lower layer, and writing in at an azimuth angle in high magnetic field in the lower layer and low magnetic field in the upper layer. CONSTITUTION:A double film recording medium is composed with high coercive force magnetic film 4 in the lower layer and low coercive force magnetic film 5 in the upper layer. First signals are recorded into the both magnetic film in high magnetic field by inclining the recording head by 1/2 of the azimuth angle phi. Then, inclining the recording head in the reverse direction by 1/2 of the azimuth angle phi, and signals are recorded in low magnetic field. Thus, since the medium 4 of the lower layer has high corcive force, it is not influenced by low magnetic field, and the previous pattern 6 remains as it has been. On the other hand, since the upper layer film body 5 has low coercive force, the previous recording is erased even if signals are recorded in low magnetic field, and a new recording pattern 7 will be recorded. By adjusting the gap of the reading head to the angle of pattern 7 of film body 5 when reading out, the record 6 on the film body 4 may not be read out by the azimuth loss, and only the record 7 on the film body 5 will be read out.