Class 428/848.2 - Specified texture or roughness (e.g., average roughness (Ra), etc.)

Subclass of Class 428 - Stock material or miscellaneous articles
Definition: Subject matter in which the disk substrate has a specified
No. of patents: 37
Last issue date: 02/28/2012

Number	Title	Issue Date
8124258	Glass substrate for magnetic disk There is provided a glass substrate for a magnetic disk in which a maximum height of bumps forming a roughness pattern at a period of smaller than 2 μm is 6 nm or lower in an annular area having a width of 30 μm on a main surface on which a magnetic recording area...	02/28/2012
7423842	Magnetic recording medium having servo and data track regions with different arithmetical mean deviations A magnetic recording medium including at least a disk substrate 1A, a magnetic recording layer 5 formed with a predetermined concavo-convex pattern on the disk substrate 1A, and a non-magnetic layer 6 filled into concave portions of the c...	09/09/2008
7381485	Magnetic recording tape A magnetic recording tape comprising a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the nonmagnetic support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to...	06/03/2008
7352529	Magnetic recording medium and magnetic recording and reproducing device using a magnetic recording layer formed with a predetermined concavo-convex pattern A magnetic recording medium including at least a disk substrate 1A, a magnetic recording layer 5 formed with a predetermined concavo-convex pattern on the disk substrate 1A, and a non-magnetic layer 6 filled into concave portions of the c...	04/01/2008
7322098	Method of simultaneous two-disk processing of single-sided magnetic recording disks Various methods and apparatus for simultaneously processing two single-sided hard memory disks is provided. Disks are positioned in pairs, with one surface of one disk positioned adjacent one surface of the second disk, with the disk surfaces touching or with a slig...	01/29/2008
7300715	Magnetic recording medium A magnetic recording medium is provided, in which a high recording density is realized, and an electromagnetic transducing characteristic and an error rate are improved. The magnetic recording medium includes a non-magnetic layer containing a non-magnetic powder and...	11/27/2007
7300714	Magnetic recording medium A magnetic recording medium is provided, in which a high recording density is realized, and an electromagnetic transducing characteristic and an error rate are improved. The magnetic recording medium includes a non-magnetic layer containing a non-magnetic powder and...	11/27/2007
7282279	Magnetic recording medium including a radiation-cured material layer having a specified structure and composition A magnetic recording medium is provided that includes a non-magnetic support and, in order, above the non-magnetic support, a radiation-cured material layer cured by exposing a layer that includes a radiation curable compound to radiation, and a magnetic layer that ...	10/16/2007
7255943	Glass substrate for a magnetic disk, magnetic disk, and methods of producing the glass substrate and the magnetic disk On a principal surface of a glass disk substrate, a texture comprising a combination of an isotropic texture for stabilizing a flight of a magnetic head flying and traveling over a magnetic disk and an anisotropic texture for imparting a magnetic anisotropy to a mag...	08/14/2007
7239483	Magnetic disk with specified contact ratio [BH 1.0 nm] and circumferential texturing and magnetic disk apparatus equipped with magnetic disk A texture processing for imparting a magnetic orientation in the circumferential direction is applied to a substrate so as to impart a magnetic anisotropy to the magnetic disk in the circumferential direction. An underlying film, a magnetic recording film, a protect...	07/03/2007
7232612	Glass substrate of disk for recording information, a disk for recording information, and a disk device for recording information In accordance with the present invention, a glass substrate of a disk for recording information, containing oxides of rare earth elements and fine particles dispersed therein, and a disk for recording information and a disk apparatus for recording information using ...	06/19/2007
7220446	Management technique of friction coefficient based on surface roughness, substrate for information recording medium, information recording medium and manufacture method thereof There are disclosed an information recording medium substrate having a surface roughness of Rmax 15 nm or less, and an information recording medium, particularly an information recording medium substrate and information recording medium in which for surfaces of the ...	05/22/2007
7179551	Poly(arylene ether) data storage media A storage media comprises: a substrate comprising a plastic resin portion, wherein to plastic resin portion comprises poly(arylene ether) and a styrene material selected from the group consisting of polystyrene, styrenic copolymer(s), and reaction products and combi...	02/20/2007
7147944	Substrate for magnetic recording media using dried thermoplastic norbornene resin and magnetic recording media using substrate The gas components in thermoplastic norbornene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin...	12/12/2006
7105238	Master information carrier for magnetic transfer A master information carrier has on its surface an irregularity pattern representing information to be magnetically transferred to a magnetic recording medium held in contact with the surface of the master information carrier. The parts of the surface of the master ...	09/12/2006
7070869	Magnetic component The invention relates to an element, comprising a substrate with a surface roughness of less than 5 nm, with saturated bonds on the surface and an MPt3 film applied to at least one side of the substrate, with a magnetic anisotropy perpendicular to the pla...	07/04/2006
7006328	Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus A magnetic recording medium comprising a glass substrate having grooves on the surface thereof, an orientation-determining layer, a non-magnetic undercoat layer, a magnetic layer, and a protective film, the layers and film being successively formed on the substrate....	02/28/2006
6986956	Method of coating smooth electroless nickel on magnetic memory disks and related memory devices A method of manufacture of thin film magnetic disks and other useful articles of similar planar geometry in which a non-magnetic layer is first deposited on one or both sides of the disk or article substrate to mask chemical and mechanically induced heterogeneities ...	01/17/2006
6670032	Oriented magnetic medium on a nonmetallic substrate This invention provides a disk which has an in-plane oriented magnetic recording layer on a glass, ceramic, or other nonmetallic substrate and a method for making the disk. A thin layer of material is deposited on the substrate to form a texture stop laye...	12/30/2003
6667118	Texture-induced magnetic anisotropy of soft underlayers for perpendicular recording media Perpendicular magnetic recording media having no, or substantially reduced, Barkhausen noise are manufactured by a method comprising steps of: (a) providing a non-magnetic substrate having a surface; (b) providing the surface of the substrate with a unidire...	12/23/2003
6632547	Substrate for magnetic recording medium, manufacturing method thereof, and magnetic recording medium A slowly advancing tape-shaped matrix is pressed into contact with a surface of a rapidly rotating non-magnetic substrate for a magnetic recording medium. An abrasive slurry is added to the matrix. The area contact rate between the matrix and the surface,...	10/14/2003
5508077	Textured disc substrate and method A disc substrate having a selected roughness gradient from an inner-diameter region to an outer-diameter region, and a method of producing the texturing on the substrate are disclosed. The method includes simulating the movement of texturing particles pro...	04/16/1996
5268207	Texturing the surface of a recording disk using particle impact In a process for manufacturing a rigid magnetic recording disk, the disk's rigid substrate member is subjected to a force that produces plastic deformation in a manner so as not to remove material therefrom. In this way, the disk is provided with a surfac...	12/07/1993
5250338	Magnetic recording medium A magnetic recording medium which comprises a non-ferromagnetic substrate having two types of defects or irregularities formed thereon along a circumferential direction with different center line average roughnesses, on which a non-ferromagnetic metal fil...	10/05/1993
5250339	Magnetic recording medium A magnetic recording medium suitable for high-density recording which comprises a non-magnetic substrate disk, at least one magnetic layer and at least one protective layer, the magnetic layer and the protective layer being formed in succession on the non...	10/05/1993
5232750	Method for fabricating magnetic recording medium A surface of a non-magnetic base plate is first coarsened to a required surface roughness and an ultrasonic vibration is then applied to the surface of the non-magnetic base plate while the non-magnetic base plate is immersed in a liquid. Thereafter, a ma...	08/03/1993
5223304	Process for fabricating magnetic disks A process for fabricating a magnetic disk which comprises texturing a magnetic disk substrate made of a non-magnetic material having provided on the surface thereof a hard layer of a metal or an oxide to thereby provide fine irregularities on the surface ...	06/29/1993
5210673	Thin-film hard disk magnetic medium A thin-film hard disk magnetic medium comprising a magnetic recording film made from a magnetic metal alloy formed on a circumferentially textured surface of a substrate, in order that the surface of the magnetic recording layer is provided with a surface...	05/11/1993
5202810	Magnetic disk having an improved surface configuration A magnetic disk includes a non-magnetic substrate with a surface processed layer having fine irregularities formed at least on a main surface thereof, and at least thin film magnetic film and a protective film formed in that order on the non-magnetic subs...	04/13/1993
5123933	Method of producing magnetic disk A method of producing a magnetic disk by lapping a magnetic disk medium, comprising the steps of: preparing a lapping tape having an abrasive particle layer provided with abrasive particle clusters and chip pockets formed between adjacent two clusters, ea...	06/23/1992
5082709	Thin film-type magnetic disk A thin film-type magnetic disk includes a non-magnetic substrate having fine particle-like projections provided over at least the entirety of the recording areas of the magnetic disk. The fine particle-like projections are formed either on bulged portions...	01/21/1992
5082747	Magnetic recording disk and sputtering process and apparatus for producing same A magnetic thin film recording disk includes a substrate of a hard electroless plated nickel surface that has been textured to encourage a circular anisotropic orientation of crystal growth during a pass-by sputtering in a continuous production line. A th...	01/21/1992
4842917	Magnetic recording medium and process for producing the same A magnetic recording medium having a magnetic film formed on a substrate directly or through an underlayer from an alloy containing Co as a principal component. The central line average surface roughness Ra and maximum surface roughness Rmax of the magnet...	06/27/1989
4735840	Magnetic recording disk and sputtering process and apparatus for producing same The improved memory disk of the present invention comprises a substrate coated with chromium with preferably a layer of cobalt/nickel as the magnetic layer sealed with a protective coating of carbon. As a result of circumferential texturing, a circular an...	04/05/1988
4698251	Magnetic recording medium and method of producing the same A magnetic disk or like magnetic recording medium having a magnetic layer provided on a non-magnetic substrate by dry-process or wet-process plating means and allowing a head to write and read data thereinto and thereoutof, and a method or producing such ...	10/06/1987
4689260	Abrasion-resistant magnetic recording disk A magnetic recording disk comprises a magnetic layer consisting of a binder and magnetic particles, a silicon substrate and abrasion-resistant material formed on the silicon substrate. The abrasion-resistant material is in the form of elevations which pro...	08/25/1987
4326229	Magnetic record member and process for manufacturing the same An improved magnetic disk recording device having a smooth recording medium layer covered with a protective film layer whose surface is formed with radially extending sinusoidal jogs or undulations defining a surface roughness greater than that of the und...	04/20/1982

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Class 428/848.2 - Specified texture or roughness (e.g., average roughness (Ra), etc.)