Abstract: To provide a substrate which is not substantially chipped or cracked on the substrate end faces even when the substrate is a silicon substrate made of a brittle material, and provide a substrate which prevents dust raising from the substrate end faces and prevents dust raising due to rubbing with a processing cassette. A silicon substrate for a magnetic recording medium is formed by setting the lengths L of chamfered portions between the main surfaces of the substrate and the outer circumferential side end face to 0.1±0.03 mm and setting the angles ? between the main surfaces and the chamfered portions between the main surfaces and the outer circumferential side end face to 45 degrees ±5 degrees. It is also possible for a curved portion with a radius of 0.01 mm or more and less than 0.3 mm is interposed between the main surfaces and the outer circumferential side chamfered portions of the substrate.

Abstract: A process for manufacturing a glass substrate for a magnetic recording medium, comprising polishing a glass substrate is polished using abrasive grains and then washing the substrate using a 0.02-0.3% aqueous hydrofluoric acid solution, and a glass substrate for a magnetic recording medium which is manufactured by the process. A polished glass substrate for a magnetic recording medium is manufactured, whereby during washing after polishing of the glass substrate, manifestation of substrate surface defects and overall waviness of the substrate can be minimized, and whereby texture formation in the subsequent texturing step can be accomplished in a uniform manner without creating variation between substrates.

Abstract: A process for manufacturing a glass substrate for a magnetic recording medium comprising polishing a crystallized glass substrate using abrasive grains, and then washing the substrate using an aqueous organic carboxylic acid solution; a glass substrate for a magnetic recording medium which is manufactured by the process; and a magnetic recording medium obtained using the substrate. A glass substrate for a magnetic recording medium is manufactured, whereby the surface roughness is low and the surface defects are minimal for washing after polishing of a crystallized glass substrate, and wherein the Read-Write performance are not impaired when a recording layer including a magnetic film is formed on the magnetic recording medium substrate for manufacturing a magnetic recording medium.

Abstract: When glass substrate is polished by using a polishing carrier, this invention provides a production method of a magnetic disk substrate that can be applied irrespective of shape, material and hardness of a polishing carrier and can prevent the occurrence of scratches on an outer end face of the glass substrate, a magnetic disk glass substrate obtained by such a method and having excellent characteristics, a production method of a magnetic disk characterized in that a magnetic recording layer is formed on such a magnetic disk glass substrate, and a magnetic disk. When glass of the glass substrate contains alkali metals, the invention can prevent the occurrence of protrusions that may result from the movement of sodium ions and lithium ions, on a magnetic film, a protective film, and so forth.

Abstract: The invention provides a magnetic disk glass substrate capable of preventing the occurrence of dust and adhesion of particles to the magnetic disk surface during a magnetic disk production process, a production method and a magnetic disk. A glass substrate for a magnetic disk has a construction in which an outer peripheral edge shape formed around a peripheral edge portion of a main surface has, with another flat portion of the main surface being the reference: an outer peripheral edge portion ski jump value of not greater than 0 ?m; an outer peripheral edge portion roll-off value of ?0.2 to 0.0 ?m; and an outer peripheral edge portion dub-off value of 0 to 120 ?; and the glass substrate has a chamfer surface between the main surface (data surface) and the outer peripheral edge surface (straight surface), and has an R surface having a radius of curvature of 0.013 to 0.080 mm between the data surface and the chamfer surface of the glass substrate.

Abstract: The invention can provide a production method for a magnetic disk substrate capable of reducing the number of surface defects of a glass substrate. When a magnetic disk is produced by using the resulting magnetic disk substrate, the yield and, furthermore, the reliability can be improved. When a surface of a magnetic disk substrate is washed after it is polished, the glass substrate is dipped into a washing solution while the surface of the glass substrate polished is held under a wet condition. The wet condition of the surface of the glass substrate includes a condition in which the glass substrate is dipped into water that may contain a surfactant, and a condition in which a liquid film is formed substantially on the entire surface.

Abstract: The present invention provides a low-cost polishing slurry having excellent effect with respect to defects and smoothness of the surface to be polished. The polishing slurry comprises a silica abrasive and a ceria abrasive, wherein the silica abrasive content is less than 3 mass % and the ceria abrasive content is less than 1 mass %, based on the entire polishing slurry. Further, the present invention provides a method for producing a crystallized glass substrate for an information recording medium, wherein the method use a polishing slurry of the present invention. Furthermore, the present invention provides a method for producing an information recording medium, comprising forming a recording layer on a crystallized glass substrate for an information recording medium obtained by the present method.

Abstract: The invention can provides a production method of a magnetic disk substrate capable of controlling surface roughness and can reduce surface defects using only a polishing step, and a production method of a magnetic disk. When a glass substrate is polished, the glass substrate polished is with abrasive slurry containing abrasives. Next, the glass substrate is further polished with an aqueous rinse solution not containing the abrasives so that the surface roughness Ra of the glass substrate is 4 to 8 ?.

Abstract: The object of the invention is to provide a method of polishing the inner peripheral end surfaces of substrates while maintaining a sufficiently high working precision at the time of polishing the inner peripheral end surfaces of a plurality of disk-like substrates for a recording medium.

Abstract: The invention provides a production method for a magnetic disk substrate capable of reducing the number of scratches occurring on the surface of a glass substrate and improving the yield of the glass substrate. When a surface of a magnetic disk substrate is polished by using polishing plates each having a pad, an amorphous or crystallized glass substrate is polished by setting a processing rate to 0.15 ?m/min or below and a pad groove width to 2 to 4 mm. Furthermore, a chemical tempered glass substrate is polished by setting the processing rate to 0.15 ?m/min or below.

Abstract: A polishing method without dispersion in the amount of working at the time of polishing the inner peripheral end surfaces of a plurality of disk-like substrates for a recording medium is provided.

Abstract: To reduce a head floating height on a magnetic disk, the invention provides a production method for a magnetic disk substrate capable of efficiently polishing the glass substrate until the degree of flatness (TIR value) of the glass substrate becomes 5 ?m or below. The invention relates to a production method, for a magnetic disk substrate, by polishing a glass substrate by lapping by using a lap plate, characterized in that plate accuracy is set to 180 ?m or below and polishing is carried out until a degree of flatness (TIR value) of the glass substrate becomes 5 ?m or below. A magnetic disk is obtained by forming a magnetic recording layer on this magnetic disk substrate.

Abstract: To start up an operating system (OS), CPU performs initializations in three modes: The three modes include a first I/O initialization (Early init) (132) which is to be done serially when no threads are yet usable, without any advanced technique and with a long wait time until a next operation can be made; a second I/O initialization (136) which is to be done when threads are usable, in a plurality of steps parallelized with each other using the usable threads according to the dependency relation between devices to be initialized and with synchronization between the steps each by a barrier; and a third I/O initialization (Lazy init) (140) in which remaining initializations are done in parallel with each other using the threads commensurately to a user process when the user process becomes executable. The present invention is applicable to home-use electric or electronic appliances.

Abstract: There are provided a culture treatment apparatus and an automatic culture apparatus capable of taking quick and appropriate action even if there is a change in the state of a space where cells stored in a container, such as a culture vessel, for the automatic culture apparatus are subjected to predetermined treatment. The culture treatment apparatus includes a treatment section for applying predetermined treatment to cells stored in an openable container for the automatic culture apparatus in a partitioned space; a detection section for detecting a predetermined state of the space, the detection section being in the space or in the vicinity of the space; and a control section for controlling the treatment section to close the container if the detection section detects the predetermined state with the container opened.

Abstract: In the present invention, a computer in which a plurality of programs are executed under a management of an Operation System having a memory management mechanism includes a unit for ensuring atomicity of a first user process without requiring a dedicated CPU instruction. The unit for ensuring atomicity includes a unit for detecting an interrupt by a second user process, a unit for canceling the first user process by utilizing a memory protection function possessed by said Operating System, and a unit for executing an operation of the first user process again.

Abstract: A multilayer printed wiring board includes a core member having a plurality of glass clothes impregnated with a resin. Each of the glass clothes is woven with glass yarns each of which includes a bundle of glass filaments. One or more buildup layers are laminated on one or each surface of the core member. The core member has an elastic modulus which is no less than 100 times that of the buildup layer at 240° C.

Abstract: A process scheduling apparatus has a delayed task handling process for processing delayed tasks having variable priorities and multiple other processes for handling processes other than delayed tasks. Fixed priorities are assigned to the other processes. The process scheduler sequentially executes the delayed task handling process and the other processes according the assigned priorities. A delayed task registration processor stores newly generated delayed tasks with assigned priorities in a queuing table. A delayed task priority controller selects the delayed task with the highest priority in the queuing table.

Abstract: To start up an operating system (OS), CPU performs initializations in three modes: The three modes include a first I/O initialization (Early init) (132) which is to be done serially when no threads are yet usable, without any advanced technique and with a long wait time until a next operation can be made; a second I/O initialization (136) which is to be done when threads are usable, in a plurality of steps parallelized with each other using the usable threads according to the dependency relation between devices to be initialized and with synchronization between the steps each by a barrier; and a third I/O initialization (Lazy init) (140) in which remaining initializations are done in parallel with each other using the threads commensurately to a user process when the user process becomes executable. The present invention is applicable to home-use electric or electronic appliances.

Abstract: A multilayer printed wiring board includes a core member including a plurality of glass clothes impregnated with a resin. Each of the glass clothes is woven with glass yarns each of which includes a bundle of glass filaments. One or more buildup layers are laminated on one or each surface of the core member. The core member has an elastic modulus which is no less than 100 times that of the buildup layer at 240° C.

Abstract: In the present invention, a computer in which a plurality of programs are executed under a management of an Operation System having a memory management mechanism includes a unit for ensuring atomicity of a first user process without requiring a dedicated CPU instruction. The unit for ensuring atomicity includes a unit for detecting an interrupt by a second user process, a unit for canceling the first user process by utilizing a memory protection function possessed by said Operating System, and a unit for executing an operation of the first user process again.