Class / Patent application number | Description | Number of patent applications / Date published |
428846200 | Composite or coated substrate (e.g., ceramic-epoxy composite, etc.) | 21 |
20090017335 | POLYCRYSTALLINE SILICON SUBSTRATE FOR MAGNETIC RECORDING MEDIA, AND MAGNETIC RECORDING MEDIUM - The proportion of {100} crystal faces, the polish rate of which is relatively high during crystal machining, and/or the proportion of {111} crystal faces, the polish rate of which is relatively low during crystal machining, to the total area (S | 01-15-2009 |
20090098415 | METHOD OF FABRICATING SILICON SUBSTRATE FOR MAGNETIC RECORDING MEDIA, AND MAGNETIC RECORDING MEDIUM - In this invention, etching is not performed in the step of planarizing a polycrystalline Si wafer, but only mechanical grinding is performed for planarization. This is because, since the etching rate is crystal-face dependent, etching of the polycrystalline Si wafer unavoidably results in formation of steps due to different crystal face orientations of individual crystal grains exposed on a surface of the wafer, thus hindering precision surface planarization. Subsequently, the Si wafer surface is coated with an oxide film to form an Si wafer with oxide film prior to the final polishing stage and then a surface of the oxide film is planarized, to give a planar substrate (i.e., Si substrate with oxide film) having no step on the surface thereof. | 04-16-2009 |
20090110963 | GLASS FOR INFORMATION RECORDING MEDIA SUBSTRATE, GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK - To provide a glass for an information recording media substrate, which is excellent in weather resistance. | 04-30-2009 |
20090136786 | SILICON SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM - A silicon substrate for a magnetic recording medium in which the substrate has a chamfered surface between its data-carrying surface (surface) having layers including a magnetic layer and its outer peripheral end surface (straight surface) is provided. The silicon substrate is characterized in that a dub-off value at an outer peripheral side of the data-carrying surface is not more than 120 Å wherein when a first position (A) is a point on the data-carrying surface radially and inwardly positioned at 1 mm from the outer peripheral end surface of the substrate, a second position (B) is a point on the data-carrying surface radially and inwardly positioned further at 1.6 mm from the first position (A), and further, provided that a perpendicular line is dropped to a straight line (A-B) connecting the first position (A) with the second position (B), a third position (C) is a point crossing the perpendicular line with the data-carrying surface and a fourth position (H) is a point crossing the perpendicular line with the straight line (A-B), the dub-off value is defined as the maximum value of the distance (C-H) between the third position (C) and the fourth position (H). Using this silicon substrate, a small avalanche point, for a higher recording density, can be obtained for the magnet recording medium. A magnetic recording medium using this silicon substrate is also provided. | 05-28-2009 |
20100190038 | GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME - A glass substrate for a magnetic disk of the invention is a disk-shaped glass substrate for a magnetic disk where the substrate has a main surface and end face and is subjected to chemical reinforcement treatment, and is characterized in that the penetration length in the uppermost-portion stress layer on the main surface is 49.1 μm or less, and that assuming that an angle between the main surface and compressive stress in the stress profile by a Babinet compensator method is θ, a value y of {12·t·ln(tan θ)+(49.1/t)} is the penetration length in the uppermost-portion stress layer or less. | 07-29-2010 |
20100247975 | Method for producing double-sided evaporation film, double-sided evaporation film intermediate, double-sided evaporation film and magnetic recording medium support - A method for producing a double-sided evaporation film by forming metal-containing evaporation films on both surfaces of a non-magnetic plastic substrate film by an evaporation system with an evaporation drum, includes, in the following order: forming a metal-containing evaporation film on a first surface of the substrate film; forming an organic substance film on the metal-containing evaporation film; and forming a metal-containing evaporation film on a second surface of the substrate film, the second surface being opposite to the first surface. | 09-30-2010 |
20110195278 | METAL PLATING ADDITIVE, AND METHOD FOR PLATING SUBSTRATES AND PRODUCTS THEREFROM - The present invention is directed to the fabrication of rigid memory disks, including a metal plating composition which impedes deposition of non-metallic particles during a plating process. The plating composition includes at least one sulfated fatty acid ester additive, or mixtures or salts thereof, of formula: wherein R1 is selected from the group consisting of OH, OCH2, OCH2CH3, C1-C7 alkyl, linear or branched; R2 selected from H and C1-C7 alkyl, linear or branched; m=1 to about 5; n=2 to about 30; o=0 to about 10; M+ is a metal or pseudo metal ion or H+. The additive has a zeta potential which impedes deposit of non-metallic particles. The invention is further directed to a method for electroless plating utilizing the additive composition in a bath with at least a stabilizing agent, complexing agent and reducing agent and source of metal ions. | 08-11-2011 |
20110206947 | METHOD OF PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM - By improving sliding durability while ensuring a high SNR, an improvement in reliability and a further increase in recording density are to be achieved. | 08-25-2011 |
20110318609 | SUBSTRATE FOR SUSPENSION, AND PRODUCTION PROCESS THEREOF - It is an object of the present invention to provide a substrate for suspension reduced in the generation of cracks in an insulating layer at the boundary region between a region where a metal supporting substrate exists and a region where no metal supporting substrate exist. The present invention solves the above object by providing a substrate for suspension comprising a first structural part including a metal supporting substrate, an insulating layer, a wiring layer, and a cover layer, and a second structural part formed so as to extend continuously from the first structural part and has no metal supporting substrate, wherein a position of an edge of an upper surface of the insulating layer coincides with a position of an edge of the lower surface of the cover layer or the position of the edge of the upper surface of the insulating layer is positioned on a side closer to the wiring layer than to the position of the edge of the lower surface of the cover layer at a boundary region between the first structural part and the second structural part. | 12-29-2011 |
20120034492 | ELECTROLESS COATED DISKS FOR HIGH TEMPERATURE APPLICATIONS AND METHODS OF MAKING THE SAME - A disk for a hard disk drive is provided. The disk comprises a substrate comprising aluminum, and a coating layer disposed over the substrate. The coating layer comprises an alloy of Ni, X | 02-09-2012 |
20130040169 | GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND MAGNETIC INFORMATION RECORDING MEDIUM TO WHICH THE GLASS SUBSTRATE IS APPLIED - Disclosed are a glass substrate for an information recording medium, having excellent scratch resistance and a light weight and having high fracture toughness, the glass substrate having a fragility index value, measured in water, of 12 μm | 02-14-2013 |
20130196178 | METHOD FOR PRODUCTION OF HARD DISK SUBSTRATE AND HARD DISK SUBSTRATE - Provided are a method for production of a hard disk substrate capable of obtaining a smooth surface of a plating film by electroless NiP plating that is not degraded in, but exhibits corrosion resistance against, an acid solution and such a hard disk substrate. The method for production of a hard disk substrate including an electroless NiP plating film, includes the steps of: a first plating step of immersing a substrate in first electroless NiP plating bath containing an additive having a smoothing effect to form a lower layer of the electroless NiP plating film on a surface of the substrate, the lower layer having an average surface roughness smaller than an average surface roughness of the surface; and a second plating step of immersing the substrate on which the lower layer of the electroless NiP plating film is formed in the first plating step in a second electroless NiP plating bath to form an upper layer of the electroless NiP plating film, the upper layer having corrosion resistance against an acid solution. The resulting plating film has a smooth surface that is not degraded in, but exhibits corrosion resistance against, an acid solution. | 08-01-2013 |
20150099143 | METHOD FOR PRODUCTION OF HARD DISK SUBSTRATE AND HARD DISK SUBSTRATE - Provided are a method for production of a hard disk substrate capable of obtaining a smooth surface of a plating film by electroless NiP plating that is not degraded in corrosion resistance against the acid solution and such a hard disk substrate. According to the present invention, a method for production of a hard disk substrate including an electroless NiP plating film, includes the steps of: a first plating step of immersing a substrate in first electroless NiP plating bath containing an additive having a smoothing effect to form a lower layer of the electroless NiP plating film on a surface of the substrate, the lower layer having average surface roughness smaller than an average surface roughness of the surface; and a second plating step of immersing the substrate on which the lower layer of the electroless NiP plating film is formed in the first plating step in second electroless NiP plating bath to form an upper layer of the electroless NiP plating film, the upper layer having corrosion resistance against the acid solution. Thereby, a plating film having a smooth surface that is not degraded in corrosion resistance against the acid solution can be obtained. | 04-09-2015 |
20160042754 | METAL MEMBER FOR MAGNETIC STORAGE MEDIUM AND MAGNETIC STORAGE MEDIUM - A metal member for magnetic storage medium includes an aluminum alloy substrate, and a nonmagnetic layer formed on at least one surface of the aluminum alloy substrate, and the nonmagnetic layer comprises a Ni—Cu—P based alloy containing 5 mass % to 50 mass % Cu and 100 ppm to 1000 ppm Pb. | 02-11-2016 |
428846300 | Silicon compound coating | 5 |
20080274381 | PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH PATTERNED MAGNETIC ISLANDS AND NONMAGNETIC TRENCHES AND MANUFACTURING METHOD FOR SUPPRESSING SURFACE DIFFUSION OF TRENCH MATERIAL - A patterned perpendicular magnetic recording medium of the type that has spaced-apart pillars with magnetic material on their ends and with trenches between the pillars that are nonmagnetic regions is made with a method that allows use of a pre-etched substrate. A nonmagnetic capping layer is located in the trenches above the nonmagnetic regions. The substrate has diffusion material in the trenches that when heated will diffuse into the magnetic recording layer material and chemically react with it. The pillars are formed of material that will not diffuse into the recording layer. The recording layer is formed over the entire substrate and a nonmagnetic capping layer that is not chemically reactive with the diffusion material is formed over the recording layer in the trenches. The substrate is annealed to cause the recording layer material in the trenches and the material in the substrate to diffuse into one another and chemically react to render the trenches nonmagnetic. The capping layer suppresses the diffusion of material from the substrate to the surface in the trenches and thus prevents migration of diffusion material to the recording layer material on the ends of the pillars. | 11-06-2008 |
20090148723 | SUBSTRATE FOR RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM USING SAME - A substrate for a recording medium suited for thermally assisted recording methods has a disc shape with a center hole and includes a silicon single-crystal supporting member; an SiO | 06-11-2009 |
20100062287 | METHOD OF POLISHING AMORPHOUS/CRYSTALLINE GLASS TO ACHIEVE A LOW RQ & WQ - A method of polishing to reduce surface roughness of at least one surface of a glass ceramic substrate that includes an amorphous glass portion and a crystalline portion. The method comprises at least one step of polishing the surface using a polishing pad and an abrasive polishing slurry. The polishing slurry comprises a first concentration of Ceria particulates and a second concentration of Silica particulates. The amorphous glass portion and the crystalline portion of the at least one surface are polished substantially equally. | 03-11-2010 |
20100247976 | GLASS SUBSTRATE FOR A MAGNETIC DISK AND METHOD OF MANUFACTURING THE SAME - A glass substrate is for use in a magnetic disk. The glass substrate is formed by using a plate-like glass produced by a float method and having a pair of main surfaces. One surface of the main surfaces, which is formed with a tin layer when producing the plate-like glass by the float method, is caused to serve as a surface not for use in magnetic recording and the other surface formed with no tin layer is caused to serve as a surface for use in magnetic recording. | 09-30-2010 |
20110014500 | Structure and method to fabricate high performance MTJ devices for spin-transfer torque (STT)-RAM application - A STT-RAM MTJ is disclosed with a MgO tunnel barrier formed by natural oxidation and containing an oxygen surfactant layer to form a more uniform MgO layer and lower breakdown distribution percent. A CoFeB/NCC/CoFeB composite free layer with a middle nanocurrent channel layer minimizes Jc | 01-20-2011 |
428846400 | Anodized or oxidized aluminum or aluminum-base alloy | 2 |
20090297888 | Support for Magnetic Recording Medium, and Magnetic Recording Medium - A magnetic recording medium substrate has a polyester film having metallic oxide-containing layers (layers M) formed on both the surfaces, one layer on each surface, the layers M having a thickness of 50 to 200 nm each, characterized in that the magnetic recording medium substrate has a total light transmittance of 0 to 75% and a surface resistivity of 1×10 | 12-03-2009 |
20120219828 | PRODUCTION METHOD OF BASE PLATE FOR DISK DRIVE, BASE PLATE FOR DISK DRIVE, AND DISK DRIVE THEREWITH - A production method of a base plate for a disk drive made by aluminum die casting which can reduce scattering of particles and minimizes particle contamination is provided. The production method of a base plate for a disk drive includes a forming step for forming a base member by aluminum die casting, a coating step for coating the base member with a resin film, a machining step for removing a part of the resin film and a surface layer of the base member in order to expose the aluminum surface, a pretreatment step for immersing the base member with the exposed aluminum surface in a pretreatment solution containing no fluoride, and a metal film forming step for coating the exposed aluminum surface with a metal film. | 08-30-2012 |