Antonelli, Terry & Wands
Magnetic head device
 A magnetic head device comprising a recording/playback magnetic head and erasing magnetic head, each of which consisting of cores made from a ferrite of Mn-Zn system and a reinforcement plate made from a non-magnetic ceramic material and bonded to respective cores; and sliders made from a non-magnetic ceramic material and united with the magnetic heads. The non-magnetic ceramic material for the sliders has a thermal expansion coefficient which is at least 5.times.10.sup.-7 /.degree.C. greater than that of the non-magnetic ceramic material for the reinforcement plate. 
Hitachi Metals, Ltd.
G G G
G11B G11B G11B
inventional inventional inventional
Shigetoshi Hirohide
Morita Yamada