Finnegan, Henderson, Farabow, Garrett & Dunner
Magnetic head assembly
 A magnetic head assembly has, at least, a recording/reproducing magnetic head made of an Mn-Zn ferrite, a first reinforcer made of a non-magnetic ceramic material and bonded by a glass to the recording/reproducing magnetic head in parallel with the gap formed in the recording/reproducing magnetic head, erasing magnetic heads attached to both sides of the first reinforcer so as to limit the recording width of the recording/reproducing magnetic head, and second reinforcers made of a non-magnetic ceramic material and bonded in parallel to gaps in the erasing magnetic heads, the second reinforcers being positioned at both sides of said recording/reproducing magnetic head. The area Af defined by the thermal expansion coefficient curve of the Mn-Zn ferrite in the temperature range between the normal room temperature and the softening point of the bonding glass and the area Ac defined by the thermal expansion coefficient curve of the first reinforcer in the same temperature range satisfy the following condition: EQU -3.8.times.10.sup.-4 .ltoreq.Af-Ac.ltoreq.1.8.times.10.sup.-4. 
Hitachi Metals, Ltd.
G G
G11B G11B
inventional inventional
Shigetoshi Hirohide Masaaki
Morita Yamada Ashizawa