公开(公告)号：DE2611666A1

公开(公告)日：1977-09-22

申请号：DE2611666

申请日：1976-03-19

Applicant: BASF AG

Inventor： SENKPIEL WERNER DIPL CHEM DR ,  SCHOEETTLE KLAUS DIPL ING ,  WITTKAMP HEINRICH DIPL ING ,  UHL KARL DIPL ING DR

IPC: G11B5/70 ,  B65H23/28 ,  C09D5/23 ,  G11B5/738 ,  G11B15/295 ,  G11B15/60 ,  G11B15/62 ,  G11B5/68

Abstract: The invention is directed to a tape transport mechanism for recording and playing back video signals comprising a contact winding mechanism with tape-guiding means at the capstan and a magnetic tape in which the substrate is a polyethylene terephthalate film. The coated side of the tape, during transport, is in contact with the guide surface of the guide means, and no part of the transport mechanism at which slip could occur during the tape transport is allowed to be in contact with the tape substrate. The tape is wound with its substrate on the inside and its coated side is preferably abrasive with respect to the guide surface, which latter may advantageously consist either of steel or a ceramic material. The bonding agent of the magnetic dispersion - preferably a chromium dioxide dispersion - may be prepared from a polyurethane/polyvinyl chloride mixture which imparts the desired hardness to the tape. The arrangement can be advantageously employed with any kind of record/playback apparatus for video signals which includes a stationary head and develops high tape advance speeds.