Rotary thin film magnetic head device

摘要

Joining end faces of semicircular magnetic rotor halves are adhered to form a disc-shaped rotor. Magnetic heads are formed at two ends of one of the joining end faces. A magnetic head core and a coil pattern for exciting the core of each of the magnetic heads are formed by alternately depositing magnetic films, insulating films or nonmagnetic conductive films in accordance with thin-film formation techniques. A groove having a triangular cross section is formed at an intermediate portion between the magnetic heads along the thickness of the given rotor half. The center of rotation of the rotor is defined by the groove. Therefore, the line connecting the distal ends of the gaps of the magnetic heads passes through the center of rotation of the rotor and a middle point of the line precisely coincides with the center of rotation. A pair of rotor coil patterns are formed on an upper surface of the rotor to be concentric with the center of rotation in accordance with thin-film formation techniques. These rotor coil patterns serve as rotors of a rotary transformer. Each rotor coil pattern is connected to the corresponding magnetic head through connecting conductors formed on one of the joining end faces in accordance with the thin-film formation techniques.