The phenomenon of magnetic transference at the Curie point can be used to duplicate video tapes by heating blank chromium dioxide tape to its Curie point while bringing it into close proximity to a magnetic mirror image of the tape which is to be duplicated, and then keeping the two tapes in contact as they are allowed to cool. Different magnetic pigments have different Curie points. 500 deg C. This means that a relatively low temperature source of heat can be used to raise the tape beyond the Curie temperature. Although just slightly above the critical temperature for maintaining polyester base stability, the Curie temperature of a CrO 2 based tape is sufficiently low that rapid heating and cooling can essentially eliminate overheating of the base film and mechanically deforming the tape. The master and slave tapes are brought into contact using high pressure air at the print wheel, a precision air bearing with a mirror finished surface and an air cap, where the slave tape is rapidly heated by the laser light up to more than 130 deg C, and then immediately allowing the tape to cool while still in contact with the master to transfer the mirror image of the master tape to the slave tape.
Loading is done automatically by detecting cue signals recorded at the beginning of the program.
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