Master carrier for magnetic transfer and method for transfer
First Claim
1. A master carrier for magnetic transfer to transfer recording information to a magnetic recording medium, said master carrier comprises a plurality of transfer information recording sectors made of ferromagnetic substance corresponding to the recording information to be transferred and having the transfer information recording sectors formed over the circumference of the master carrier with spacing at a fixed angle, non-magnetic material sectors to define the transfer information recording sectors are present between adjacent transfer information recording sectors and surfaces of the non-magnetic material sectors are substantially positioned on and forming the same plane.
2 Assignments
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Accused Products
Abstract
The present invention provides a master carrier for magnetic transfer, comprising a plurality of transfer information recording sectors having recording information magnetized thereon, a non-magnetic-material sector defining each of the transfer information recording sectors is present between each of adjacent transfer information recording sectors, and surfaces of the transfer information recording sectors and surfaces of the non-magnetic material sectors are positioned on and form the same plane.
129 Citations
17 Claims
- 1. A master carrier for magnetic transfer to transfer recording information to a magnetic recording medium, said master carrier comprises a plurality of transfer information recording sectors made of ferromagnetic substance corresponding to the recording information to be transferred and having the transfer information recording sectors formed over the circumference of the master carrier with spacing at a fixed angle, non-magnetic material sectors to define the transfer information recording sectors are present between adjacent transfer information recording sectors and surfaces of the non-magnetic material sectors are substantially positioned on and forming the same plane.
- 5. A master carrier for magnetic transfer to transfer recording information to a magnetic recording medium, said master carrier comprises a plurality of transfer information recording sectors made of ferromagnetic substance corresponding to the recording information to be transferred and being in form of projections on a substrate, and non-magnetic conductive layers formed between the transfer information recording sectors and the substrate.
- 9. A master carrier for magnetic transfer to transfer recording information to a magnetic recording medium, said master carrier comprises a plurality of transfer information recording sectors made of ferromagnetic substance corresponding to the recording information to be transferred and being formed on a substrate, a space or a non-magnetic sector is present between each of the adjacent transfer information recording sectors, surface hardness of each of the transfer information recording sectors is not lower than 20 GPa, and a diamond-like carbon protective film of 3 to 30 nm in thickness is provided on the surface.
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11. A method for magnetic transfer to transfer recording information to a magnetic recording medium, said method comprising the steps of providing a master carrier for magnetic transfer and a slave medium, and for bringing said master carrier and said slave medium into contact with each other, whereby said master carrier for magnetic transfer comprises a plurality of transfer information recording sectors with recording information for transfer magnetized thereon and being formed on a substrate, a space or a non-magnetic sector being provided on each of adjacent transfer information recording sectors, surface hardness of each of said transfer information recording sectors is not lower than 20 GPa, and a diamond-like carbon protective film of 3 to 30 nm in thickness is provided on the surface of the master carrier, and said slave medium has surface hardness of not lower than 1 GPa and has flexibility.
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12. A method for magnetic transfer, comprising the steps of providing a master carrier for magnetic transfer having a magnetic layer on a portion corresponding to information signal on substrate surface and a slave medium to receive transfer, bringing said master carrier into contact with the slave medium, and applying magnetic field for transfer, whereby relationship between coercive force Hcs of the slave magnetic recording medium and the magnetic field for transfer is:
0.6×
Hcs≦
magnetic field transfer≦
1.7×
Hcs.- View Dependent Claims (13)
- 14. A magnetic transfer method to transfer recording information to a magnetic recording medium, comprising a step of performing magnetic transfer by bringing the magnetic recording medium into close contact with a master carrier for magnetic transfer, said master carrier comprises a plurality of transfer information recording sectors made of ferromagnetic substance corresponding to the recording information to be transferred and having the transfer information recording sectors formed over the circumference of the master carrier with spacing at a fixed angle, non-magnetic material sectors to define the transfer information recording sectors are present between adjacent transfer information recording sectors, and surfaces of the transfer information recording sectors and surfaces of the non-magnetic material sectors are substantially positioned on and forming the same plane.
Specification