Abstract: A container supplying apparatus includes a supply conveyer conveying containers and a screw engaging with the containers on the supply conveyer and conveying the containers to a downstream side. The screw is divided into an upstream screw and a downstream screw rotationally driven by different servomotors. In a case where no container is supplied to a specific bottle table of a weighing and filling apparatus, the upstream screw is decelerated and is then accelerated relative to the downstream screw. As a result, an interval of the successive containers is expanded, and a large interval is maintained therebetween. This supplies no container to the specific bottle table of the weighing and filling apparatus.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 ?pm and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A glass substrate for a magnetic recording medium is formed to have a disc shape and includes ridge shaped textures 13 extending along concentric circles on a main surface. When measuring a 10 ?m square range with an atomic force microscope, the textures have a width W that is between 10 and 200 nm. The textures have a height H that is between 2 and 10 nm. Further, the textures have a ratio (Rp/RMs) of a maximum mountain height with respect to a root mean square roughness that is less than or equal to 15. The textures include high frequency components superimposed on the low frequency components. It is preferable that the textures of the high frequency components have a width W? that is between 0.1 and 20 nm, and the textures of the high frequency components have a height H? that is between 0.1 and 1 nm.

Abstract: Provided is a method for manufacturing a glass substrate for an information recording medium, which is advantageous in that oozing of an alkali and deformation of a texture are suppressed. The glass substrate is chemically reinforced, and a texture is formed in the glass substrate, and then treated with a neutral or alkaline aqueous solution. In the texture forming step, the surface of the glass substrate is etched in a depth of 0.5 to 10 nm.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A glass substrate for a magnetic recording medium is formed to have a disc shape and includes ridge shaped textures 13 extending along concentric circles on a main surface. When measuring a 10 ?m square range with an atomic force microscope, the textures have a width W that is between 10 and 200 nm. The textures have a height H that is between 2 and 10 nm. Further, the textures have a ratio (Rp/RMs) of a maximum mountain height with respect to a root mean square roughness that is less than or equal to 15. The textures include high frequency components superimposed on the low frequency components. It is preferable that the textures of the high frequency components have a width W? that is between 0.1 and 20 nm, and the textures of the high frequency components have a height H? that is between 0.1 and 1 nm.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.0l ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: The present invention provides a method which can simultaneously grind inner peripheral edges and outer peripheral edges of a multiplicity of glass substrates used for magnetic storage media or the like. In order to chamfer the outer edges of the glass substrates g, a multiplicity of annular glass substrates g are firstly stacked with buffer sheets 5 interposed between the glass substrates to make a glass substrate block G. Then, a first plates 1, 1 of the above described clamping jig are applied to both sides of the glass substrate block G, and a first fastening tool 3 is inserted through center holes of the first plates 1, 1 and the glass substrate block G. Next, the glass substrate block G is clamped from an inside thereof for chamfering the outer edges with a grindstone 6.

Abstract: A method for manufacturing a disk-like glass substrate that is used as an information recording medium. The glass substrate is acid resistant. When an index of acid resistance is the maximum depth at which components other than silica dissolve from the glass substrate during immersion of the glass substrate in 1 percentage of weight of sulfuric acid, the acid resistance of the glass substrate is represented by the maximum depth of 0.5 nm to 10 nm. A linear texture is formed by pressing a tape against the glass substrate in a circumferential direction of the glass substrate while feeding abrasion slurry to the surface of the glass substrate. Acid treatment is performed on the glass substrate on which the texture is formed.

Abstract: There is provided a method of polishing a glass substrate for information recording media which enables polishing to be carried out such that the product quality is improved, without the productivity dropping, and without the processing cost increasing. A precision polishing step has a first polishing step and a second polishing step carried out in this order, in which, after carrying out rough polishing on major surfaces of a glass substrate, precision polishing is carried out on the major surfaces by feeding abrasive grains onto the major surfaces, pushing polishing members against the major surfaces, and rotating the major surfaces and the polishing members relative to one another. At least one of the first polishing step and the second polishing step has a preceding polishing step and a succeeding polishing step carried out in this order.

Abstract: A method for manufacturing a disk-like glass substrate that is used as an information recording medium. The glass substrate is acid resistant. When an index of acid resistance is the maximum depth at which components other than silica dissolve from the glass substrate during immersion of the glass substrate in 1 percentage of weight of sulfuric acid, the acid resistance of the glass substrate is represented by the maximum depth of 0.5 nm to 10 nm. A linear texture is formed by pressing a tape against the glass substrate in a circumferential direction of the glass substrate while feeding abrasion slurry to the surface of the glass substrate. Acid treatment is performed on the glass substrate on which the texture is formed.

Abstract: Provided is a method for manufacturing a glass substrate for an information recording medium, which is advantageous in that oozing of an alkali and deformation of a texture are suppressed. The glass substrate is chemically reinforced, and a texture is formed in the glass substrate, and then treated with a neutral or alkaline aqueous solution. In the texture forming step, the surface of the glass substrate is etched in a depth of 0.5 to 10 nm.

Abstract: There is provided a method of polishing a glass substrate for information recording media which enables polishing to be carried out such that the product quality is improved, without the productivity dropping, and without the processing cost increasing. A precision polishing step has a first polishing step and a second polishing step carried out in this order, in which, after carrying out rough polishing on major surfaces of a glass substrate, precision polishing is carried out on the major surfaces by feeding abrasive grains onto the major surfaces, pushing polishing members against the major surfaces, and rotating the major surfaces and the polishing members relative to one another. At least one of the first polishing step and the second polishing step has a preceding polishing step and a succeeding polishing step carried out in this order.

Abstract: The present invention relates to a substrate for information recording media for use as a disk substrate in a hard disk drive or the like and a manufacturing method thereof, an information recording medium such as a magnetic disk, and a starting material glass plate for use as a starting material of the substrate for information recording media. By suitably controlling forming conditions of the starting material glass plate, the starting material glass plate can be manufactured so as to have a long-wavelength waviness of not more than 6 nm. By carrying out precision polishing on this starting material glass plate having a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 &mgr;m and a 90% diameter of the volume grain size distribution of not more than 0.02 &mgr;m, a substrate for information recording media having an excellent planarity can be obtained in a short time and with a low polishing amount.

Abstract: There is provided a method of manufacturing a glass substrate for magnetic disks, according to which circumferential direction texture can be formed without bringing about a drop in anisotropy, thus enabling coating with a magnetic recording layer having a large magnetic coercivity. In a texturing step, a tape is used while a diamond slurry is fed onto at least one main surface of a glass substrate member that has been processed into a substantially circular shape, thus forming a linear texture in a circumferential direction on the at least one main surface. In a chemical strengthening step, the mechanical strength of the glass substrate member is chemically strengthened to a level required of the glass substrate for magnetic disks. The texturing step is carried out after the chemical strengthening step.

Abstract: The present invention provides a method which can simultaneously grind inner peripheral edges and outer peripheral edges of a multiplicity of glass substrates used for magnetic storage media or the like.