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| Number | Title | Issue Date |
| 7876531 | Virtual front shield writer A magnetic writer includes a first write element and a second write element. The first write element produces a first field when a first current is passed through a first coil. The second write element, which is disposed relative to the first write element, produces... | 01/25/2011 |
| 7357998 | Disk substrate for a perpendicular magnetic recording medium, perpendicular magnetic recording disk and manufacturing methods thereof A disk substrate for a perpendicular magnetic recording medium comprises a disk base member, a soft magnetic layer formed on the disk base member, and a protection layer formed on the soft magnetic layer. The soft magnetic layer and the protection layer are deposite... | 04/15/2008 |
| 7274120 | Drive unit and image pickup unit equipped with the drive unit A drive unit for performing precise linear movement of a driven object comprises a motor having a cylindrical stator and a cylindrical rotor that is coaxially put in the cylindrical stator and capable of rotating relatively to the cylindrical stator, a movable barre... | 09/25/2007 |
| 7167342 | Magnetic recording medium, magnetic recording playback device, and information processing device A magnetic recording medium is provided while including a recording layer in which magnetic materials are in the shape of a circular cylinder and uniformity and size reduction are achieved simultaneously. The magnetic recording medium includes a recording layer and ... | 01/23/2007 |
| 7158345 | Thin-film magnetic head appropriately suppressing side fringing and method for fabricating the same A thin-film magnetic head includes a lower core layer; a recording core formed on the lower core layer and exposed at a face surface facing a recording medium, the recording core including a gap layer, an upper pole layer, and optionally, a lower pole layer; an uppe... | 01/02/2007 |
| 6941643 | Method of producing a thin film magnetic head A thin film magnetic head includes a magnetic lower core layer, a magnetic upper core layer, a coil layer, for inducing a recording magnetic field in the lower core layer and the upper core layer, formed so as to go around the base of the upper core layer, and a pla... | 09/13/2005 |
| 6922030 | Adjustable iris-diaphragm controller An adjustable iri-diaphragm controller includes a brushless direct current (DC) motor, an iris defining an aperture that corresponds to an angular position of the DC motor, and a control module including a differential circuit, an integrator, and a current-limiting ... | 07/26/2005 |
| 6911261 | pH adjustment of a melt for use in microetching glass substrates A method of adjusting the pH of a strengthening melt to provide an adjusted melt for use in microetching glass substrates, such as glass disk substrates for use in data storage devices. A base is added to the strengthening melt to raise its pH. A desired degree of m... | 06/28/2005 |
| 6791797 | Cylindrical magnetic recording medium and method for manufacturing the same A magnetic recording medium includes a cylindrical substrate and pores embedded with a magnetic substance that are provided on the outer circumferential surface of the cylindrical substrate and aligned in tracks that are in parallel with one another along the center... | 09/14/2004 |
| 5525398 | Perpendicular magnetic recording medium and method for making A perpendicular magnetic recording medium has a magnetic layer comprised of two stacked sublayers each in the form of ferromagnetic metal thin film consisting of columnar crystal grains wherein the angle θ between the average growth direction of the colu... | 06/11/1996 |
| 5418670 | Magnetic recording medium having a servo pattern of the intermittent type with compensation for suppressing self-generated residual fields A magnetic recording medium has recorded thereon a series of discrete time-limited servo signal bursts. To suppress residual fields emanating from each servo signal burst, at least one half-cycle of a compensating signal is recorded immediately prior to a... | 05/23/1995 |
| 5342682 | Method of molding optical recording drums A method for fabricating in a mold a rotatable recording drum is disclosed. Initially, the mold is rotated and a predetermined quantity of a flowable substance is poured into the mold cavity and is centrifugally flung against the mold wall to form a mold ... | 08/30/1994 |
| 5249093 | Magnetic disk A magnetic disk comprises an annular resilient magnetic recording mediumm, an outer ring having an outer affixing surface, and an annular frame disposed radially inwardly of the outer ring. The annular frame comprises an annular thrusting surface protrude... | 09/28/1993 |
| 5234762 | Compliant support with mutually adhered web for transfer of information A duplicating, printing or recording surface is produced by attaching a strip (10) of magnetic or other web material to a support such as a drum (20) or flat support element provided with a layer (22) of low durometer elastomer, the strip of material and ... | 08/10/1993 |
| 5212615 | Data storage device having stretched and distended magnetic media surface A data storage device having two distended and stretched magnetic media surfaces. The magnetic media has a backing which is distended when secured to a core body of the device. A shell surrounds the core body to further stretch the backing resulting in a ... | 05/18/1993 |
| 5134038 | Thin film magnetic recording medium with controlled grain morphology and topology A magnetic storage medium is composed of a non-wettable substrate upon which a transient liquid metal layer is deposited and maintained as a distribution of discontinuous liquid features. A magnetic film layer is deposited on the transient liquid metal la... | 07/28/1992 |
| 4745510 | Perpendicular magnetic recording and reproducing system A perpendicular magnetic recording and reproducing system records and reproduces a signal on and from a perpendicular magnetic recording medium comprising a magnetic layer which is made from one magnetic material and is constituted by a layer having a low... | 05/17/1988 |
| 4740250 | Aluminium base-alloy for head drum of video cassette recorders An aluminium-base alloy for head drum of video cassette recorders(VCR), which contains copper, magnesium, nickel, silicon, iron and Titanium+Boron and to which chromium is added optionally. The proposed alloy is characterized in that thermal expansion coeffici... | 04/26/1988 |
| 4707756 | Perpendicular magnetic recording medium Disclosed is a perpendicular magnetic recording medium wherein an underlayer made of a material containing Si and/or Ge as its principal ingredient is deposited on a substrate, and a perpendicular magnetic film made of a Co-based alloy is deposited on the... | 11/17/1987 |
| 4659633 | Magnetic recording medium A magnetic recording medium having good durability comprising a substrate and one or two magnetic layers at least a surface of which contains at least one compound selected from the group consisting of a compound of the formula: wherein R is a C2 | 04/21/1987 |
| 4659627 | Magnetic recording medium with lubricant Magnetic recording media having a coating containing harsh pigment like CrO2 particles and adapted for frequent contact with a head, with good durability, abrasivity, etc., accommodated by using a lubricant system including a fluoro-silicone oi... | 04/21/1987 |
| 4654276 | Magnetic recording medium with an underlayer and a cobalt-based magnetic layer An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a coercivity substantially greater than prior CoPt thin film metal alloy media. A tungsten underlayer between the substrate and the CoPt magnetic layer im... | 03/31/1987 |
| 4652499 | Magnetic recording medium with a chromium alloy underlayer and a cobalt-based magnetic layer An improved cobalt-platinum (CoPt) thin film metal alloy media for horizontal magnetic recording has a squareness greater than prior CoPt thin film metal alloy media. An underlayer of a body-centered-cubic (BCC) chromium-based alloy with a lattice cell co... | 03/24/1987 |
| 4652496 | Magnetic recording medium Disclosed is a magnetic recording medium which comprises a support, a magnetic recording layer and optionally a back-coating layer, at least of said magnetic recording layer and said back-coating layer containing a urethane resin having a yield point. The... | 03/24/1987 |
| 4647507 | Magnetic recording material A magnetic recording medium wherein a thin layer comprising an organic compound having at least one carboxyl or mercapto group, at least one fluoroalkyl group having 3 or more carbon atoms and at least one aliphatic alkyl group having 8 or more carbon ato... | 03/03/1987 |
| 4647506 | Flexible, self-cross-linking binders Flexible, self-cross-linking binders, useful for, e.g., paints and magnetic media composites, are prepared from hydroxyl-containing thermoplastic polymers reacted with condensates of diisocyanates and unsaturated esters. They can be cured with an electron... | 03/03/1987 |
| 4643949 | Magnetic recording tape Magnetic recording tape comprising a flexible substrate with magnetic particles secured to the substrate by means of a binder comprising a reaction product of a diisocyanate with a blend of a chain extender and a hydroxyl terminated polycarbonate, said bi... | 02/17/1987 |
| 4643934 | Magnetic recording medium In a magnetic recording medium having a magnetic recording coat formed on one side of a base and a back coat on the other side, the back coat consists of a dispersion in a binder of an inorgainc pigment powder having an average particle diameter of 0.2 to... | 02/17/1987 |
| 4640863 | Magnetic recording media A magnetic recording medium comprising a flexible support and a magnetic layer formed on the flexible support. The flexible support is made of a resin composition which comprises thermoplastic resins and particles of titanium monoxide or dititanium trioxi... | 02/03/1987 |
| 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 said magnetic layer has a surface roughness of at most 0.... | 01/27/1987 |
| 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 non-magnetic base material; (2) which is featured by containing as s... | 01/20/1987 |
| 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, and a non-magnetic backcoat on the other major surface of ... | 01/20/1987 |
| 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 binder, a thermoplastic polyurethane-urea resin is employed, ... | 01/20/1987 |
| 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, and at least one of the elements selected from the group of... | 01/13/1987 |
| 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 process comprises providing a gas containing at least one... | 01/13/1987 |
| 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 dispersed in a resin binder. The abrasive powder has a coa... | 01/06/1987 |
| 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 which unsaturated bonds sensitive to radiation are introduc... | 01/06/1987 |
| 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 acetate and vinyl alcohol with ferromagnetic particles an... | 01/06/1987 |
| 4633357 | Tubular recording medium having a flexible magnetic recording surface A recording medium operative with a recording and/or reproducing apparatus comprising a rotational motor and recording and/or reproducing transducer. The recording medium comprises a main body including a flexible recording carrier in the form of a sheet ... | 12/30/1986 |
| 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 a support and (2) irradiating the resulting support with e... | 12/30/1986 |
