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AssigneesTokyo Magnetic Printing Co., Ltd., TDK Corporation
InventorsMasahiro Ito, Shohei Mimura, Masao Shigeta, Tsutomu Chou
Estimating the term…
A magnetic recording medium, and methods of making and reading the same, including on at least a portion of a substrate an irreversible recording layer which contains an irreversible recording material undergoing an irreversible change of saturation magnetization upon heating. The invention involves the steps of previously heating the irreversible recording layer to form an initial heated region in which a plurality of heated bars whose saturation magnetization has been irreversibly changed are arrayed in a bar code pattern, and converting unheated bars disposed between the heated bars into a heated state for changing the array pattern of heated bars, thereby recording the information.
A method of making a magnetic recording medium comprising the steps of:
A method of reading a magnetic recording medium including a hard magnetic material and an irreversible recording material included in a layer having unheated bars and heated bars with irreversibly changed saturation magnetization arrayed in a bar code pattern, said method of reading comprising the steps of:
A method of reading a magnetic recording medium including a hard magnetic material and an irreversible recording material included in a layer having unheated bars and heated bars with irreversibly change saturation magnetization arrayed in a bar code pattern, said method of reading comprising the steps of:
A magnetic recording medium comprising:
Dependencies are inferred from the claim text.