| 摘要 |
A video head drum for a helical scan type video tape recorder, in which a rotary head drum is fixed to a rotary shaft by use of a ring member placed over a cylindrical member which is fitted into the central portion of the rotary head drum and substantially fixed thereto and in which the rotary shaft is inserted, and a pair of ring-shaped fastening plates. The cross section of the ring member in the rotating axial direction indicates an outward bulge at the center and the ring-shaped fastening plates are disposed so as to sandwich the bulge. By fastening the ring-shaped plates, the ring member is forced to be compressed in the radius direction thereof, fixing tightly the cylindrical member to the rotary shaft and consequently fixing the rotary head drum to the rotary shaft, whereby correct attachment of the rotary head drum to the rotary shaft, without causing any eccentric rotation of the rotary head drum or vibrations thereof, can be attained.
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