IP Library › Granted Patent US 6,879,452
Granted Patent B2
US 6,879,452 · App. 10/322,437 · Granted Apr 12, 2005

Master information carrier for magnetic transfer

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Quick Facts
Patent No.
US 6,879,452
App. No.
10/322,437
Granted
Apr 12, 2005
Kind
B2
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.

Claims (7)

1. 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 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.

2. A master information carrier as defined in claim 1 in which the coefficient of thermal expansion of the base sheet of the master information carrier is in the range of 10×10 −6 /° C. to 15×10 −6 /° C.

3. A master information carrier as defined in claim 1 which the base sheet of the master information carrier is of pure Ni or Ni—Co containing therein a slight amount of Co.

4. A master information carrier as defined in claim 1 in which the base sheet of the master information carrier is of Fe—Co—Ni containing therein 60% or more of Ni.

5. A master information carrier as defined in claim 1 in which the ratio B/A of the coefficient B of thermal expansion of the base sheet of the slave medium to the coefficient A of thermal expansion of the base sheet of the master information carrier is in the range of 0.3 to 2.1.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 15, 2007
From: FUJIFILM HOLDINGS CORPORATION (FORMERLY FUJI PHOTO FILM CO., LTD.)
To: FUJIFILM CORPORATION
Reel/Frame 018904/0001 →