Master information carrier for magnetic transfer
AssigneeFuji Photo Film Co., Ltd.
InventorsKazuhiro Niitsuma, Masakazu Nishikawa
Life of this patent
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Abstract
A master information carrier includes a base sheet provided with a pattern representing a signal and a magnetic layer formed on the pattern. A transfer magnetic field is applied to a slave medium in a close contact with the master information carrier to magnetically transfer the signal from the master information carrier to the slave medium. The coefficient of thermal expansion of the base sheet of the master information carrier is in the range of 5×10−6/° C. to 25×10−6/° C., and the thermal expansion difference in different directions of the base sheet of the master information carrier is not larger than 8×10−6/° C.
Claims5
A master information carrier which comprises a base sheet provided with a pattern representing a signal and a magnetic layer formed on the pattern and is for transferring the signal to a slave medium in a close contact with the master information carrier, wherein the improvement comprises that
- the coefficient of thermal expansion of the base sheet of the master information carrier is in the range of 5×10−6/° C. to 25×10−6/° C., and
- the thermal expansion difference in different directions of the base sheet of the master information carrier is not larger than 8×10−6/° C.
Dependencies are inferred from the claim text.