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4639389 |
Magnetic recording medium
A magnetic recording medium comprising a plastic base film, a magnetic layer formed on one side of the base film and a backing layer formed on the other side of the base film, characterized in that...
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4637964 |
Magnetic recording medium
Disclosed herein is a magnetic recording medium, (1) in which a magnetic layer is formed by coating a magnetic paint containing a magnetic powder and a binder as its main components on a...
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4637963 |
Magnetic recording medium and method for making
In a magnetic recording medium comprising a non-magnetic substrate having opposed major surfaces, a non-magnetic undercoat on one major surface of the substrate, a magnetic layer on the undercoat,...
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4637959 |
Magnetic recording medium
A magnetic recording medium comprised of a non-magnetic substrate and a magnetic layer formed on one surface of the substrate and consisting essentially of a binder and magnetic powders. As the...
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4636448 |
Magnetic recording medium
In a magnetic recording medium particularly for perpendicular magnetization comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two...
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4636435 |
Polymeric thin film, process for producing the same and products containing said thin film
The present invention concerns a process for producing a novel polymeric thin film having high density, high hardness and high toughness on the surface of a substrate by plasma polymerization. This...
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4636433 |
Magnetic powders for magnetic recording media and magnetic recording media employing said magnetic powder therein
A magnetic powder for magnetic recording media comprises a hexagonal crystalline system ferrite containing, as essential components for said hexagonal crystalline system ferrite, iron and oxygen,...
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4634633 |
Magnetic recording medium
A magnetic recording medium has a magnetic layer consisting essentially of a binder and magnetic particles on one surface of a non-magnetic substrate. The thermoplastic polyurethane-urea resin in...
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4634632 |
Magnetic recording medium
A magnetic recording medium having excellent electromagnetic properties and satisfactory running durability prepared by mixing a highly concentrated solution of copolymers for vinyl chloride, vinyl...
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4634627 |
Magnetic recording medium comprising a surface-treated abrasive
A magnetic recording medium comprising a nonmagnetic support, and a magnetic recording layer formed on said support. The magnetic recording layer comprises a magnetic powder and an abrasive powder...
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4633451 |
Optical servo for magnetic disks
The surface of a magnetic recording disk is encoded with optically sensed indicia, which is employed to control track following of the read/write slider head along a track on a magnetic recording...
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4632878 |
Magnetic recording medium
The present invention relates to a magnetic recording medium prepared by the process comprising (1) coating a magnetic coating composition mainly containing ferromagnetic particles and a binder on...
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4632870 |
Magnetic recording medium
A magnetic recording medium comprising a plastic base of polyester film or the like having a magnetic coat formed on one side, the magnetic coat consisting of a dispersion of a ferromagnetic powder...
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4632868 |
Magnetic recording media
A magnetic recording medium comprising a nonmagnetic supporting substrate and a magnetic layer provided thereon by a binder, said magnetic layer contains a ferromagnetic alloy powder having a...
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4632866 |
Magnetic recording medium
In a coating type magnetic recording medium, a base film is coated with a magnetic paint composition comprising a binder and a magnetic powder mixture of magnetic metal particles with magnetic...
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4631620 |
Magnetic disk cartridge
The magnetic disk of a magnetic disk cartridge is provided with a center core assembly which comprises a main core, an upper core with grooves on one side for engagement with the ridges of a...
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4631609 |
Stretched surface recording disk substrate
A stretched surface recording disk includes an annular substrate to which are adhesively attached magnetic recording films covering each major surface of the substrate. The substrate has annular...
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4631606 |
System for detecting the position of a read-write head on a disk recording medium having servo sectors with three or more servo patterns
In order to perform a high-speed seek of a target track while the increase of area of servo sectors is minimized, each servo sector of a disk recording medium has K (an integer of 3 or more) servo...
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4629646 |
Magnetic recording medium
A magnetic recording medium comprising a non-magnetic substrate, a magnetic recording layer formed on one side of the substrate and a back coating layer formed on the other side of the substrate,...
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4628009 |
Magnetic recording medium
A magnetic recording medium which comprises a plastic base film, a thin magnetic metal layer formed on one side of the base film and a thermoset backing layer formed on the other side of the base...
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4626949 |
Magnetic record disk cleaning and stabilizing assembly
A magnetic record disk assembly includes a floppy disk located within a rigid case having integral case stiffeners, wiping force appliers and floppy disk stabilizers. Wipers made of fabric,...
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4626941 |
Method and apparatus for suppressing the evaporation of lubricant film coated on magnetic disks of a disk storage
A magnetic disk storage apparatus includes an air-tight enclosure containing a drive mechanism for rotating magnetic disks coated with a lubricant material and a flying head assembly. A lubricant...
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4626463 |
Diskette having wear-resistant magnetizable layer
Magnetizable layer of a diskette, as in the prior art, comprises acicular magnetizable particles, alpha-Fe 2 O 3 particles, and head-cleaning agent particles dispersed in nonmagnetizable binder....
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4625384 |
Method of making a recording disc
A recording disc is provided by a disc-shaped, formed-sheet-metal support across which a flexible recording sheet is stretched. The formed-sheet-metal support has a central spindle opening which...
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4624894 |
Magnetic recording medium
In a magnetic recording medium, double magnetic layers are formed on one side of a substrate with a lower magnetic layer containing metallic magnetic particles formed on the substrate and an upper...
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4624883 |
Magnetic recording medium
A magnetic recording medium which comprises a first magnetic layer on a base and a second magnetic layer over the first magnetic layer, the second magnetic layer containing magnetic particles...
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4623942 |
Method and arrangement for detecting error signals in a disk-drive, and a magnetic test disk therefor
A method and an arrangement for detecting error signals in a magnetic disk drive apparatus uses a test disk which has a plurality of test tracks distributed over the recording area and containing...
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4623570 |
Stable stretched surface recording medium
Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the...
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4622661 |
Optically readable storage disc
An interchangeable optically readable storage disk has a substrate with a recording surface, and a cover thereon which may comprise a second substrate with a further recording layer. The disk...
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4621030 |
Perpendicular magnetic recording medium and manufacturing method thereof
A perpendicular magnetic recording medium free from spike noise having a high permeability magnetic material film, an antiferromagnetic material film and a perpendicularly oriented magnetic...
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4621027 |
Magnetic recording medium
A magnetic recording medium is described, comprising a support and a magnetic layer disposed thereon, said magnetic layer containing as its binder component a combination of at least one member of...
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4621018 |
Magnetic recording medium
A magnetic recording medium comprising a transparent support and a magnetic layer formed on the support, said magnetic layer comprising Co-adsorbed Fe 3 O 4 and Co-adsorbed γ-Fe 2 O 3 in a...
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4621016 |
Magnetic recording media
By inclusion of a fluorinated graphite material in conjunction with carbon black in the magnetic layer of a magnetic recording medium, the medium is improved significantly in its surface properties...
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4621008 |
Magnetic recording medium
A magnetic recording medium for use in video and other applications is presented which comprises a substrate, a continuous thin magnetic layer of cobalt and at least one selected from nickel,...
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4619868 |
Magnetic recording medium
A magnetic recording medium comprised of a support having a magnetic layer coated thereon is disclosed. The magnetic layer is comprised of a binder composition having a ferromagnetic powder...
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4619856 |
Magnetic recording medium
A magnetic recording medium is described, comprising a nonmagnetic support, a magnetic layer, and a nonmagnetic intermediate layer provided between the support and the magnetic layer, the...
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4619855 |
Magnetic recording medium with electron beam cured magnetic layer
A magnetic recording medium is disclosed. The medium is comprised of a support base having an average center line roughness (Ra) of 0.035 μm or less which has coated thereon a magnetic layer. The...
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4618900 |
Magnetic disk and spindle for driving the same
Disclosed is a magnetic disk comprising a center hub directly/indirectly fixedly attached to a central hole portion of a disk-like magnetic storage medium, a circular center hole formed at a...
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4618542 |
Magnetic thin film
A magnetic thin film comprised of at least one, usually two magnetic metals selected from iron, nickel, and cobalt is vapor phase grown on a substrate, for example, polyimide film by introducing...
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4618537 |
Recording medium
A recording medium comprising a substrate, a recording layer formed thereupon, and an anticorrosive layer which covers the recording layer and contains a chemical to prevent the corrosion of the...
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4618536 |
Magnetic recording medium
A magnetic recording medium having a high durability with good electro-magnetic properties, which comprises a base material and a magnetic layer provided thereon, the magnetic layer containing...
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4618535 |
Magnetic recording medium
A magnetic recording medium comprising a plastic base film, a thin magnetic metal layer formed on one side of the base film and a backing layer formed on the other side of the base film,...
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4617226 |
Magnetic recording medium
A novel magnetic recording medium comprising a non-magnetic support, a magnetic recording layer, and an intermediate layer containing an electroconductive polymer. An optional second intermediate...
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4616278 |
Information record disk having a unified structure
An information record disc for use in a magnetic recording and reproducing apparatus to provide a plurality of still pictures in a plurality of spiral tracks on a magnetic disc thereof, includes an...
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4615949 |
Magnetic recording medium
A magnetic recording medium comprises a magnetic coating material, or a dispersion of magnetic particles in a resinous binder, and a base to which the coating material is solidly applied, the...
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4615930 |
Magnetic recording media having an undercoat as islands
A magnetic recording medium comprising a non-magnetic resin support, and a magnetic layer form on the support. A polyester or polyurethane resin undercoat is formed between the support and the...
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4614687 |
Magnetic recording medium
A magnetic recording medium which comprises a plastic base film and a magnetic layer formed on one side of the base film and composed of ferromagnetic alloy powder dispersed in a resin binder,...
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4613915 |
Twin track vertical magnetic recording servo control method and apparatus with offset voltage compensation
This invention utilizes a sectored servo control having dual servo tracks recorded in the servo sector. In addition, the servo sector track portions have been recorded with two 180° flux reversals...
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4613548 |
Polyphosphazene magnetic tape lube
A magnetic recording media containing a normally liquid polyphosphazene lubricant, e.g. low molecular weight linear or cyclic poly-fluoroalkoxy phosphazene mixtures.
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4613545 |
Magnetic recording medium
A magnetic recording medium has on a nonmagnetic support, a magnetic layer consisting mainly of an acicular magnetic powder and a binder. The medium has excellent magnetic characteristics required...
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