Importance

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Abstract

A magnetic transducer head having, at the face end wall, at least one pair of transducer pole piece portions extending in the direction of movement of the tape and having a gap between them. The pole pieces are tangent, at the gap, to a base plane parallel to the general direction of movement of the tape. In the example illustrated, the pole piece portions are disposed at approximately 13.degree. relative to the base plane so that the spacing between the pole piece portions and the base plane increases with distance from the gap on both the approach to and retreat from the gap. The casing has a tape guide surface which overlies the pole piece portions at the face end wall and determines the angle of approach to and retreat from the pole piece portions. This guide surface is cylindrical in the example illustrated, providing an approximately 7.degree. angle of approach and retreat of the tape relative to the base plane, this being substantially less than the 13.degree. angle of the pole piece portions themselves. When used with a standard NAB tape cartridge, a pressure pad within the cartridge presses the tape against the 7.degree. guide surface to conform therewith, thereby positively training the tape to approach and retreat from the gap at that angle, independent of the larger approach and retreat angles of the pole pieces themselves. The face wall of the head has a central window through which the gap and immediately adjacent surfaces of the pole piece portions extend into direct contact with the tape. The pole piece portions continue beneath the guide surface on the face wall fore and aft of the leading and lagging edges of the window.

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First Claim