公开(公告)号：DE2459878A1

公开(公告)日：1975-07-03

申请号：DE2459878

申请日：1974-12-18

Applicant: IBM

Inventor： LAENEN EDWARD GERALD ,  PRAHL MARVIN EDWARD

IPC: G11B5/53 ,  G11B15/61 ,  G11B15/64 ,  H04N5/78

公开(公告)号：DE2459817A1

公开(公告)日：1975-07-03

申请号：DE2459817

申请日：1974-12-18

Applicant: IBM

Inventor： GRIFFITHS DONALD ERIC ,  LAENEN EDWARD GERALD ,  KALTHOFF CLEMENT HENRY

IPC: G11B15/60 ,  G11B15/61 ,  G11B15/64 ,  H04N5/78

Abstract: A rotating head mandrel is contoured so that in cross-section the mandrel appears similar to the shape of an eyeball. Two mandrels are axially aligned for supporting a tape helically wrapped about the mandrels. Between the two mandrels is a rotor carrying a magnetic head. The magnetic tape helically wraps the two mandrels in the region of the rotor. The path of the rotating head relative to the tape is a transverse track at an acute angle to the longitudinal direction of the tape. The peak of the eyeball contour or cam shape contour of the mandrel is located at the entry and exit points of the tape as it helically wraps the mandrels. The peak gives the tape additional height relative to the rotating head and prevents the head from nicking the edge of the tape as it crosses the edges of the helically wrapped tape. The surfaces of the mandrels have holes through which air may be forced to provide a hydrostatic air bearing between the tape and the mandrels. The pattern of the holes on the mandrels is selected to support the tape in a uniform manner during helical wrap of the tape about the mandrels.