Abstract:
The present invention provides a method of manufacturing glass substrates for information recording medium comprising steps of polishing of several glass substrates polished at a time using sun-and-planet gear type polishing machine; selectively determining at least two different annular zones of the polishing plate and controlling the temperature variation of the determined annular zones of the polishing machine so as to suppress and control thickness variation of glass substrates. Thickness variation can be suppressed and controlled when temperature gap on different zones of polishing plate is low. It is also the object of the present invention that the temperature variation of at least two different annular zones of polishing plate of the polishing machine is determined to be not over 2 °C. By such a method according to this invention, the surface of glass substrates on different annular zones of polishing plate can be polished so as to have low thickness variations.
Abstract:
The invention disclosed an apparatus for chamfering glass substrates use for the manufacturing of information recording medium. The apparatus comprising a first and a second claim jigs adapted to clamp the glass substrate during chamfering. A method for chamfering glass substrate is also disclosed. The method comprising a step of cleaning the clamp jigs faces at the end of each chamfering cycle so as to remove contaminants, including glass chips from the faces of the clamp jigs prior to introduction of the next glass disk onto the chamfering apparatus.
Abstract:
The present invention provides a method of manufacturing glass substrates for information recording medium comprising steps of polishing of several glass substrates polished at a time using sun-and-planet gear type polishing machine; selectively determining at least two different annular zones of the polishing plate and controlling the temperature variation of the determined annular zones of the polishing machine so as to suppress and control thickness variation of glass substrates. Thickness variation can be suppressed and controlled when temperature gap on different zones of polishing plate is low. It is also the object of the present invention that the temperature variation of at least two different annular zones of polishing plate of the polishing machine is determined to be not over 2 °C. By such a method according to this invention, the surface of glass substrates on different annular zones of polishing plate can be polished so as to have low thickness variations.
Abstract:
Example embodiments relate generally to a device, and methods thereof, for securing a substrate for use in information recording. When in operation, the substrate is securable by selectively cooperating inwardly pressure about the substrate and outwardly pressure about a residing surface.
Abstract:
The present invention disclosed a method of manufacturing glass substrates for information recording medium comprising steps to suppress flatness variation of glass substrate among batches by maintaining a level of slurry concentration circulated in lapping or polishing process using new-formulated or recycled slurry. The present invention also related to a method to suppress flatness variation by removing glass sludge from the polishing slurry circulation.
Abstract:
Example embodiments relate generally to a substrate, information recording medium, information recording device and methods of manufacturing substrates for use in information recording mediums, said methods comprising the steps of polishing a plurality of substrates, pad dressing with a pad dresser after subjecting polishing pads to a plurality of polishing steps, wherein a force is applied onto said pad dresser, from said polishing pads, so as to cause a suppressed variation in outer peripheral portion size among the manufactured substrates.