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US20110123831 METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK  
The present invention relates to a method for manufacturing a glass substrate for a magnetic disk, the method including: a polishing step of supplying a polishing slurry between a polishing cloth...
US20110159319 DISK-SHAPED GLASS SUBSTRATE AND METHOD OF MANUFACTURING DISK-SHAPED GLASS SUBSTRATE  
A front end portion of a core drill is formed in an arc shape in which longitudinal cross-sectional portions have the same radius. A contact width of a cutting edge of the core drill which first...
US20150213826 MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK  
A magnetic-disk glass substrate of the present invention has an average value of squares of inclinations of 0.0025 or less and a frequency at which squares of inclinations are 0.004 or more of 15%...
US20110159320 GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF  
The present invention provides a glass substrate for magnetic disk in which surface irregularity of a principal surface is suppressed and a method for efficiently manufacturing a glass substrate...
US20150248910 MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK  
A magnetic-disk glass substrate of the present invention has a pair of main surfaces, and an arithmetic mean roughness (Ra) for wavelength components of 10 to 50 nm of the surface of the main...
US20110129693 MAGNETIC DISK GLASS SUBSTRATE  
A magnetic disk glass substrate including compressive stress layers at main surfaces and a tensile stress layer between the compressive stress layers formed by chemical strengthening. When the...
US20110159321 GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF  
The present invention provides a method for efficiently manufacturing a glass substrate for magnetic disk having good accuracy of a surface irregularity and an impact resistance. The method...
US20090239102 GLASS FOR DATA STORAGE MEDIUM SUBSTRATE, GLASS SUBSTRATE FOR DATA STORAGE MEDIUM AND MAGNETIC DISK  
To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained. Glass for a data storage medium substrate, which comprises, as represented by mol percentage...
US20100040907 MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND MAGNETIC DISK DEVICE  
It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that...
US20130316194 MANUFACTURING METHOD OF GLASS BLANK FOR MAGNETIC DISK, MANUFACTURING METHOD OF GLASS SUBSTRATE FOR MAGNETIC DISK, GLASS BLANK FOR MAGNETIC DISK, GLASS SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK  
To provide a method for manufacturing a glass blank for magnetic disk and a method for manufacturing a glass substrate for magnetic disk, which are capable of producing a glass blank for magnetic...
US20080268295 GLASS-CERAMICS  
Glass-ceramics include SiO2, Al2O3 and Li2O on oxide basis. In the glass-ceramics, total amount in mass % of SiO2 and Al2O3 is less than 77% and Li2O/(SiO2+Al2O3) which is the ratio in mass % of...
US20110151282 METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR DATA STORAGE MEDIUM AND GLASS SUBSTRATE  
The present invention relates to a method for manufacturing a glass substrate for data storage mediums, the method including a chemical strengthening treatment step of dipping a glass for a...
US20080241603 Magnetic Disk Glass Substrate  
A magnetic disk glass substrate including compressive stress layers at main surfaces and a tensile stress layer between the compressive stress layers formed by chemical strengthening. When the...
US20070251270 METHOD FOR PRODUCING GLASS SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK  
A method for producing a glass substrate for a magnetic disk by polishing a circular glass plate, which comprises a step of polishing the principal plane of the circular glass plate by using a...
US20130083425 MANUFACTURING METHOD OF GLASS SUBSTRATE FOR MAGNETIC DISK, MAGNETIC DISK, AND MAGNETIC RECORDING / REPRODUCING DEVICE  
A manufacturing method of a glass substrate for a magnetic disk is provided whereby nano pits and/or nano scratches cannot be easily produced in polishing a principal face of a glass substrate...
US20130189546 Method for Producing Glass Substrate for Information Storage Medium, and Information Storage Medium  
For an information storage medium a glass substrate is produced in a method including the steps of: polishing a glass substrate with a polishing agent applied thereon; and subsequently, chemically...
US20050238927 Glass substrate for perpendicular magnetic recording disk and method of producing same  
A glass substrate for perpendicular magnetic recording, having a surface with an average surface roughness of 2.0 Å or less and surface height variations of 1 Å or less with wavelengths in the...
US20100136372 GLASS SUBSTRATE FOR MAGNETIC DISK AND METHOD FOR PRODUCING THE SAME  
The present invention relates to a method for producing a glass substrate for a magnetic disk, the method including a step of polishing a main surface of a circular glass plate while supplying a...
US20090142626 GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK APPARATUS  
A glass substrate for a magnetic disk satisfies Ra1≦0.8 [nm], 0 [nm]≦Ra1−Ra2≦0.2 [nm], Wa1≦0.6 [nm], and 0 [nm]≦Wa2−Wa1≦0.2 [nm]. Ra1 is an average surface roughness of a first annular area...
US20140065446 METHOD FOR MANUFACTURING GLASS BLANK FOR MAGNETIC DISK, METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK, GLASS BLANK FOR MAGNETIC DISK  
A method for manufacturing a glass blank for magnetic disk and a method for manufacturing a glass substrate for magnetic disk are provided which are capable of producing a glass blank for magnetic...
US20110165439 METHOD OF MANUFACTURING A GLASS SUBSTRATE FOR A MAGNETIC DISK, GLASS SUBSTRATE FOR A MAGNETIC DISK, METHOD OF MANUFACTURING A MAGNETIC DISK, AND MAGNETIC DISK  
Provided is a method of manufacturing a magnetic disk glass substrate, wherein, in a main surface polishing process, main surface polishing is applied to one of main surfaces of a glass substrate...
US20150118522 METHOD OF FABRICATING A GLASS MAGNETIC HARD DRIVE DISK PLATTER USING FILAMENTATION BY BURST ULTRAFAST LASER PULSES  
A non-ablative method and apparatus for making an economical glass hard disk (platter) for a computer hard disk drive (HDD) using a material machining technique involving filamentation by burst...
US20110268994 GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, POLISHING COLLOIDAL SILICA SLURRY FOR MANUFACTURING THE SAME AND INFORMATION RECORDING MEDIUM  
The present invention relates to a colloidal silica slurry used in a method for manufacturing a glass substrate for an information recording medium, the method including: a lapping step of lapping...
US20060216552 Chemically strengthened glass, substrate for information recording medium and information recording medium  
A glass for use in chemical reinforcement for use in a substrate of an information recording medium, having a composition comprising, denoted as mol %: SiO247 to 70% Al2O31 to 10%(where the total...
US20090324995 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...
US20100266874 METHOD OF SURFACE-FINISHING GLASS SUBSTRATE FOR MAGNETIC DISKS AND GLASS SUBSTRATE FOR MAGNETIC DISKS  
An inner peripheral edge of a toroidal glass substrate for a magnetic disk is subjected to mechanical polishing in such a manner that the surface roughness is no greater than 9 nm in terms of...
US20150262604 MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK  
A magnetic-disk glass substrate according to the present invention is a doughnut-shaped magnetic-disk glass substrate having a circular hole provided in the center, a pair of main surfaces, and an...
US20140287269 GLASS SUBSTRATE FOR A MAGNETIC DISK AND MAGNETIC DISK  
Provided are a magnetic disk substrate and a method of manufacturing the same, wherein the magnetic disk substrate has very few defects present on its surface with an arithmetic mean roughness...
US20090142621 CHROMIUM NITRIDE LAYER FOR MAGNETIC RECORDING MEDIUM  
A magnetic recording media with a multilayer structure and methods for forming the media are described. The magnetic recording media includes a substrate, an underlayer on top of the substrate and...
US20090239101 GLASS SUBSTRATE AND THERMAL-ASSISTED MAGNETIC RECORDING DISK  
A plurality of recording magnetization portions is arranged in a concentric manner around a center of a glass substrate. A plurality of non-magnetization portion having a thermal conductivity...
US20120107647 GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM  
An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass comprising, denoted as molar percentages, 56 to 75 percent of SiO2, 1...
US20150255103 MAGNETIC-DISK GLASS SUBSTRATE, MAGNETIC DISK AND METHOD FOR MANUFACTURING MAGNETIC-DISK GLASS SUBSTRATE  
A magnetic-disk glass substrate of the present invention includes a pair of main surfaces, a side wall surface, and a chamfered surface between the main surfaces and the side wall surface....
US20070264533 Information recording medium glass substrate and information recording medium  
Information recording medium glass substrate which is a molded article composed of an alkali metal-containing glass material having a composition including at least B, Al, alkali metals, Zn, and...
US20110008649 GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING THE SAME, AND MAGNETIC RECORDING MEDIUM  
The present invention relates to a method for manufacturing a glass substrate for information recording medium, the method including: a lapping step of lapping a circular glass plate made of an...
US20050042409 Magnetic disk, magnetic disk manufacturing method and magnetic disk apparatus  
Provided is a magnetic disk capable of reducing waves and realizing a high recording density. A main surface of the disk is made from a silicate glass substrate and has a magnetic recording layer...
US20120276416 MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND MAGNETIC DISK DEVICE  
It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that...
US20070111042 Alkali-depleted glass & glass-based substrates for magnetic & magneto-optical recording media  
A method of manufacturing a glass or glass-based non-magnetic substrate for a magnetic or magneto-optical (MO) data/information storage and retrieval medium comprises sequential steps of providing...
US20090148724 Glass Substrate for Magnetic Recording Medium and Magnetic Recording Medium  
A glass substrate for a magnetic recording medium, having a chamfer face between the surface of the substrate for forming thereon a film comprising a magnetic layer, and the outer peripheral end...
US20060042317 Method of producing a glass substrate for a magnetic disk, Method of producing a magnetic disk, and a cylindrical glass material for a glass substrate  
On producing a glass substrate for a magnetic disk, a side surface of a cylindrical glass material (3) is polished or mirror-finished before the cylindrical glass material is cut in a direction...
US20090136659 METHOD FOR PRODUCING GLASS SUBSTRATE FOR MAGNETIC DISK AND METHOD FOR PRODUCING MAGNETIC DISK  
In a method in which a cut line is formed on one surface of a planar glass material, and the cut line is allowed to extend in the thickness direction of the glass material, thereby cutting a glass...
US20120244388 GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIA, PROCESS FOR ITS PRODUCTION, AND MAGNETIC RECORDING MEDIUM  
A process for producing a glass substrate for information recording media, comprising lapping a glass disk made of low alkali aluminosilicate glass that contains no alkali metal oxide or contains...
US20140085750 GLASS SUBSTRATE FOR A MAGNETIC DISK, MAGNETIC DISK AND METHOD OF MANUFACTURING A MAGNETIC DISK  
A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer...
US20120282493 GLASS SUBSTRATE FOR A MAGNETIC DISK, MAGNETIC DISK AND METHOD OF MANUFACTURING A MAGNETIC DISK  
A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer...
US20150262605 GLASS FOR MAGNETIC RECORDING MEDIA SUBSTRATES, MAGNETIC RECORDING MEDIA SUBSTRATES, MAGNETIC RECORDING MEDIA AND METHOD FOR PREPARATION THEREOF  
The provided are a glass for a magnetic recording medium substrate permitting the realization of a magnetic recording medium substrate affording good chemical durability and having an extremely...
US20110086241 GLASS FOR MAGNETIC RECORDING MEDIA SUBSTRATES, MAGNETIC RECORDING MEDIA SUBSTRATES, MAGNETIC RECORDING MEDIA AND METHOD FOR PREPARATION THEREOF  
The provided are a glass for a magnetic recording medium substrate permitting the realization of a magnetic recording medium substrate affording good chemical durability and having an extremely...
US20110064971 GLASS SUBSTRATE MANUFACTURING METHOD, GLASS SUBSTRATE POLISHING METHOD, GLASS SUBSTRATE POLISHING APPARATUS AND GLASS SUBSTRATE  
A polishing apparatus, includes: a motor; and a controlling unit configured to control the motor, wherein: a glass substrate is polished by causing the controlling unit to control a driving of the...
US20100330396 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. A glass for an information recording media substrate, which comprises, as represented by...
US20070128471 Magnetic disk and magnetic disk manufacturing method  
In a magnetic disk having at least a glass substrate, a plurality of underlayers formed over the glass substrate, and a magnetic layer formed over the plurality of underlayers, at least one of the...
US20140220386 SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK  
The shape and number of surface defects are controlled so that the occurrence of failure is suppressed in an HDD device in which a magnetic head with a very small flying height, such as a DFH...
US20110109994 SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK  
The shape and number of surface defects are controlled so that the occurrence of failure is suppressed in an HDD device in which a magnetic head with a very small flying height, such as a DFH...
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