Patent ID: 6885513

Claim:
Apparatus for producing recorded signals on a magnetic recording medium comprising: (a) A master element having a permanently formed physical pattern of magnetic and nonmagnetic areas of lands and voids respectively on one surface thereof, said pattern not being magnetizable or erasable by electromagnetic means, said lands being formed of soft magnetic material having high permeability and low coercivity and disposed over a nonmagnetic base, (b) means for moving said medium relative to said element bringing a predetermined next portion of said medium to alignment with said element; (c) means for stopping said medium and holding said medium and said element with substantially no relative motion between said medium and said element, while said element and said medium are maintained in close transducing relation; (d) a magnetic head selected from the group consisting of bipolar heads and quadrupole heads, said magnetic head in recording position relative to said element and said medium; (e) means for said magnetic head to provide a magnetic field to effectively record on said medium a pattern of signals corresponding to said physical pattern; (f) means for reducing said magnetic field of said magnetic head before said medium is moved relative to said element, whereby erasure or corruption of said pattern of signals is avoided.