Patent application number | Description | Published |
20080200097 | POLISHING METHOD AND POLISHING APPARATUS - The polishing method of a disk-shaped substrate for polishing an outer circumference | 08-21-2008 |
20080223402 | DISK-SHAPED SUBSTRATE MANUFACTURING METHOD AND WASHING APPARATUS - The disk-shaped substrate manufacturing method is provided with: scrub-washing a first surface and a second surface of a disk-shaped substrate by respectively using a first porous roller and a second porous roller that have a cylindrical shape and are rotationally driven. The process of the scrub-washing determines a distance between axes of the first porous roller and the second porous roller that sandwich the disk-shaped substrate in between, and performs scrub-washing while the determined distance between the axes is under control. | 09-18-2008 |
20080233841 | DISK-SHAPED SUBSTRATE MANUFACTURING METHOD - The disk-shaped substrate manufacturing method is provided with: generating an air stream downward from an upper area during grinding a disk-shaped substrate in a grinding apparatus; arranging the grinding apparatus on an upper floor face of a floor and arranging water on a lower floor face of the floor, the upper floor face being made of a board having penetration holes or a mesh member, and the lower floor face supporting the upper floor face so as to be located above the lower floor face with a distance; and guiding dust made by the grinding apparatus to the water by use of the air stream. | 09-25-2008 |
20110030424 | METHOD OF MANUFACTURING SUBSTRATE FOR MAGNETIC RECORDING MEDIUM - A method of manufacturing a substrate for a magnetic recording medium that is capable of manufacturing a magnetic recording medium substrate having no warping and superior surface smoothness at a high level of productivity and at low cost. The method of manufacturing a substrate for a magnetic recording medium according to the present invention includes a thin glass sheet formation step of heating and softening a sheet-like glass base material ( | 02-10-2011 |
20120045971 | METHOD OF MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIA - The invention provides a method of manufacturing a glass substrate for magnetic recording media. And the glass substrate has high surface smoothness and little waviness. In the primary, secondary and tertiary lapping process, diamond pads | 02-23-2012 |
20120100786 | METHOD OF MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIA - The invention provides a method of manufacturing a glass substrate for magnetic recording media. And the glass substrate has high surface smoothness and little waviness. In the primary, secondary and tertiary lapping process, diamond pads | 04-26-2012 |
20120103937 | METHOD OF MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC STORAGE MEDIUM - A method of manufacturing a glass substrate for a magnetic recording medium, wherein inner and outer circumference end faces of a disk-like glass substrate having a central aperture are at least treated by: a step of grinding, a step of etching, and a step of polishing, wherein the steps are performed in this order. | 05-03-2012 |
20120204603 | METHOD FOR PRODUCING GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM - The object of the present invention is to provide a production method for a glass substrate having a sufficient impact resistance for a magnetic recording medium with high productivity, without using cerium oxide, or by decreasing the amount of cerium oxide used in the polishing step, and the present invention provides a method for producing a glass substrate for a magnetic recording medium including at least a grinding step for inner and outer peripheries of a disc-shaped glass substrate having a center hole, wherein the grinding step includes a first grinding step for inner and outer peripheries of the glass substrate using a metal-bonded diamond grinding stone in which diamond abrasive grains are fixed with a metal binder, and a second grinding step for the inner and outer peripheries of the glass substrate using a resin-bonded diamond grinding stone in which diamond abrasive grains are fixed with a resin binder. | 08-16-2012 |
20120225610 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM GLASS SUBSTRATE - Provided is a magnetic recording medium glass substrate manufacturing method capable of manufacturing a magnetic recording medium glass substrate having high surface smoothness and low surface waviness with productivity. In a primary lapping process and a secondary lapping process of the manufacturing method, diamond pads ( | 09-06-2012 |