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Inventor:
Nagao; Makoto
Address:
Kanagawa, JP
No. of patents:
17
Patents:












Patent Number Title Of Patent Date Issued
6977786 Information recording method using a vertical magnetic system December 20, 2005
In an information recording method of the present invention by carrying out recording data while carrying out tracking servo accurately, high density recording of signals at a good S/N can be carried out, and high density recording by a vertical magnetic recording system can be carried o
6829201 Magnetic information recording medium having regions magnetized in different directions, a metho December 7, 2004
There are provided an information recording medium which permits accurate tracking servo, and a method for recording and reproducing for an information recording medium which allows recording and reproducing of a signal at a favorable S/N by carrying out at least one of information r
5348811 Recording medium and method of performing recording/producing on the recording medium September 20, 1994
A recording medium and method of performing recording/reproducing on the recording medium. The recording medium includes a multi-layer structure wherein at least two kinds of atomic layers are alternately laminated on a support. The elements of the atomic layers are selected so that they
5061562 Method for preparing a magnetic recording medium and a magnetic disk using the same October 29, 1991
A method for preparing a magnetic recording medium which comprises the steps:(a) providing on a non-magnetic support, a thin magnetic metal film,(b) providing on the thin magnetic film, a protective layer comprised substantially of carbon,(c) washing the surface of the protective layer at le
4994321 Perpendicular magnetic recording medium and the method for preparing the same February 19, 1991
A perpendicular magnetic recording medium such as a floppy disk is created by providing on at least one surface of a non-magnetic support, a magnetic layer having perpendicular magnetic anisotropy and a protective layer by sputtering. First, a magnetic layer is provided, secondly, the ma
4994305 Method for producing magnetic recording medium February 19, 1991
A method for producing a magnetic recording medium in which a flexible nonmagnetic support is moved continuously while being retained in contact with a plurality of spaced apart cylindrical cans to form thin films of metal on opposite sides of the support successively at portions where t
4956229 Magnetic recording medium September 11, 1990
A durable, rust- and scratch-resistant magnetic recording medium coated thereon a thin ferromagnetic film comprising an iron oxide nitride, wherein said film is an aggregation of pillar particles of said iron oxide nitride, said particles having a higher nitrogen content on their surface
4869797 Method for preparing a magnetic recording medium September 26, 1989
A method of preparing a magnetic recording medium in which a magnetic layer is deposited on a non-magnetic support and then a carbon protective layer is sputtered onto the magnetic layer. The sputtering is performed with a bias voltage of -10V to -100V being applied in the vicinity of th
4868070 Vertical magnetization type recording medium and manufacturing method therefor September 19, 1989
In a method of manufacturing a vertical magnetization type recording medium, a soft magnetic film layer is formed on each of the two sides of a non-magnetic support, and then a vertical magnetization film layer is formed on each soft magnetic film layer thus formed, thereby to provide a
4867101 Apparatus for producing magnetic recording medium September 19, 1989
Contaminant magnetic dust particles and flakes generated during the thin film coating of a substrate 9 in a vacuum chamber 1 are gravitationally collected in catch pans or troughs 8 disposed below the deposition zones. Magnets 10 are provided under the bottoms of the pans to enhance the
4865878 Method of manufacturing vertical magnetization type recording medium September 12, 1989
In a method of manufacturing a vertical magnetization type recording medium, a soft magnetic film layer is formed on each of the two sides of a non-magnetic support, and then a vertical magnetization film layer is formed on each soft magnetic film layer thus formed, thereby to provide a
4840843 Magnetic recording medium June 20, 1989
A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a thin magnetic metal film and a protective layer mainly comprising carbon having a graphite structure containing at least one element selected from the group consisting of Mn, Mo, Nb, Ta,
4717592 Vertical magnetization type recording medium and manufacturing method therefor January 5, 1988
In forming a vertical magnetization type recording medium, a first soft magnetic film layer is formed on each side of a film-shaped support by vacuum deposition or sputtering at a temperature of 30.degree. C. or lower, a second soft magnetic film layer is formed on each of the first
4609962 Magnetic recording medium having improved weather resistance September 2, 1986
A metal thin film type magnetic recording medium having an improved weather resistance is disclosed, which comprises a non-magnetic support base having provided thereon a ferromagnetic metal thin film comprised of column-shaped clusters of ferromagnetic particle having longitudinal axes
4536443 Magnetic recording medium August 20, 1985
A magnetic recording medium comprises a non-magnetic substrate and at least one layer of obliquely deposited magnetic crystals which contains, as a main constituent, Co or a Co--Ni based alloy containing Cr in an amount within the range of 2 to 8 atom % and has a density of 5.0 g/cm.sup.
4521481 Magnetic recording medium June 4, 1985
A magnetic recording medium comprises a non-magnetic substrate and at least one layer of obliquely deposited magnetic crystals which contains, as a main constituent, a Co-Ni based alloy containing Cr in an amount within the range of 2 to 8 atom % and which is obliquely deposited on the
4511635 Magnetic recording medium April 16, 1985
A magnetic recording medium comprises a non-magnetic high-molecular film and at least one magnetic layer containing Co, Ni, Cr and oxygen and formed on the non-magnetic high-molecular film by an oblique incidence vacuum deposition method. The Cr content is within the range of 2 to 8










 
 
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