Dynamic magnetic information storage or retrieval – Record copying – Contact transfer
Patent
1974-02-06
1978-07-18
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Record copying
Contact transfer
360 71, G11B 586, G11B 1543
Patent
active
041019385
ABSTRACT:
A copying machine for reproducing magnetic video tapes wherein the copies are brought into contact with a master tape, upon which is recorded original video information and with the copy or slave tape being heated at a temperature in the vicinity of the Curie point such that the recorded information on the master tape will be printed on the slave or copy tape. Since the copy or slave tape will shrink after the heating, the present invention provides for compensation of the shrinkage of the slave or copy tape by expanding the master tape in a direction and manner so as to provide that the information on the slave tape will be accurate after it has cooled down.
An oscillator is connected to two recording heads spaced a fixed distance apart which record two signals on the master tape before it has been heated and two reproducing heads are mounted the same fixed distance apart as the recording heads adjacent the slave tape after it has cooled and a comparator detects any phase difference and controls the tape speed.
REFERENCES:
patent: 3777075 (1973-12-01), Hendershot III, et al.
patent: 3825948 (1974-07-01), Hendershot III, et al.
patent: 3827077 (1974-07-01), Kobilka
Cardillo Raymond F.
Sony Corporation
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