| 摘要 |
A rotary magnetic head assembly for use in recording and playing back video signals including a rotary head drum, a stationary head drum, and magnetic heads. The rotary head drum is supported by a driving shaft and has an outer surface which is generally cylindrical. The rotary drum is rotatable when driven by the shaft. The stationary head drum is disposed coaxially with the rotary drum, and has an outer surface which is generally cylindrical and substantially equal in diameter to the outer surface of the rotary drum. The rotary drum has a first surface opposing the stationary drum with shape formed by a generatrix not perpendicular to the shaft such as a conical or cylindrical. The stationary drum has a second surface opposing the first surface of the rotary drum. The second surface is generally of a shape about the shaft, which is complementary to the first surface to form an air gap between the rotary and stationary head drums through which air flows to form an air film on the outer surfaces of the drums. The magnetic heads are supported on the rotary drum closely to the outer surface of the rotary drum in the gap. The generatrices may preferably be straight, stepwise or gently curved. Coil windings of a rotary transformer of the first and second surfaces may be mounted in grooves provided on the first and second surfaces, and affixed therein by a fixing agent to preferably form smooth and flat surfaces continuous to the first and second surfaces, respectively.
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