Tape-like magnetic medium
AssigneeEMTEC Magnetics GmbH
InventorsJens Soder, Hansjorg Traub, Jurgen Keske, Wolfgang Neumann, Edgar Genter
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Abstract
A tape-like magnetic medium comprising a flexible substrate and a magnetic layer thereon which comprises magnetic pigment and polymeric binder. The magnetic layer has a thickness of at least 3 μm and a specific surface porosity of at least 80 cm2/cm2. Also provided are a production process for the medium and a high-speed process for the production of a copy of a magnetic master tape.
Claims46
A tape-like magnetic medium, comprising a flexible substrate and, on a first side of the substrate, at least one magnetic layer which comprises magnetic pigment and polymeric binder, wherein the at least one magnetic layer has a thickness dM of at least 3 μm and a specific surface porosity SSP of at least 80 cm2/cm2, the SSP being the product of a specific nitrogen adsorption per volume element, according to BET, of the magnetic layer (in cm2/cm3) and the thickness dM of the magnetic layer (in cm).
A process for the production of a copy of a magnetic recording medium having information recorded thereon, wherein a master tape comprising a first magnetic layer and having information recorded thereon and a copy tape comprising a second magnetic layer are passed, at a speed of at least about 4 m/s and with contact of the first and second magnetic layers with one another, over a copying device, and wherein the copy tape is heated above its Curie temperature to copy information recorded on the master tape onto the copy tape.
A process for the production of a copy of a magnetic recording medium having information recorded thereon, wherein a master tape comprising a first magnetic layer and having information recorded thereon and a copy tape comprising a second magnetic layer are passed, at a speed of at least about 4 m/s and with contact of the first and second magnetic layers with one another, over a copying device, and wherein an external magnetic field whose strength is not higher than half the coercive force of the master tape is applied to the master tape and the copy tape to copy information recorded on the master tape onto the copy tape.
Dependencies are inferred from the claim text.