AUXILIARY MAGNETIC FIELD APPLYING DEVICE

摘要

PURPOSE:To efficiently perform the application of a magnetic field to a magneto- optical recording medium by providing a magnetic flux feedback part at a magnetic flux feedback plate as the supporting plate of an auxiliary magnetic field applying device as making approach a magnetic field emitting plane when recording or erasure is performed on the medium by supplying an auxiliary magnetic field interlocking with an optical beam. CONSTITUTION:The magnetic field emitted from he magnetic field emitting plane 1a of a magnetic core part 1 is absorbed in the magnetic flux feedback part 4a of the magnetic flux feedback plate 4 functioning as a yoke part and also, functioning as the supporting plate of the auxiliary magnetic field applying device, which enables the magnetic field to be applied efficiently and uniformly to the medium arranged in the neighborhood of the emitting plane 1a and the feedback part 4a. Also, heat generated from a coil 3 can be emitted naturally extending over the whole of a magnetic plate 2 formed thinly and the plate 4 formed thinly similarly, and furthermore, it follows that the magnetic field generated at a part 1b on which the coil is wound when it is energized can be emitted uniformly in the radius direction of a disk 6 from the emitting plane 1a. By employing such constitution, the device can be formed thinly, and also, assembling can be easily performed.