Abstract: Chamfering processing for chamfering an edge face of a disk-shaped glass plate includes a step of disposing the glass plate such that a portion of the glass plate is disposed in a heating space for heating the glass plate and the remaining portion is disposed outside the heating space; and a step of softening a portion of the edge face of the glass plate by irradiating a circumferential portion of the edge face with a laser beam outside the heating space while rotating the glass plate in one direction around the center of the glass plate, and heating the softened portion of the edge face that has reached the heating space through the rotation.

Abstract: A disk-shaped glass substrate manufacturing method for manufacturing a glass substrate (1) includes preparing a disk-shaped glass blank having main surfaces (11a, 11b) and an outer circumferential end face (12), and irradiating the disk-shaped glass blank with a laser beam (L) along a distance longer than one lap of the outer circumferential end face (12) of the disk-shaped glass blank.

Abstract: A method for manufacturing a disk-shaped glass plate in which shape processing is performed on an edge surface of the glass plate includes processing the edge surface into a target shape by irradiating the edge surface with a laser beam while moving the laser beam relative to the edge surface in a circumferential direction of the glass plate. A cross-sectional intensity distribution of the laser beam with which the edge surface is irradiated is a single mode, and W1>Th holds true and Pd×Th is in a range of 0.8 to 3.5 [W/mm] when a width of luminous flux of the laser beam in a thickness direction of the glass plate at an irradiation position of the edge surface is W1 [mm], a thickness of the glass plate is Th [mm], and a power density of the laser beam is Pd.

Abstract: A magnetic-disk substrate includes two main surfaces and an outer circumferential edge surface. The outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that extends between the two chamfered surfaces. The side wall surface is a curved surface that protrudes outward. The side wall surface has a radius of curvature of 1100 ?m or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate. The magnetic-disk substrate has a plate thickness of less than 0.46 mm. The magnetic-disk substrate is a glass substrate. A length in a direction parallel to the main surface between a connection position at which the chamfered surface is connected to the main surface and a position at which the side wall surface protrudes most outward is 100 ?m or less.

Abstract: A compound of formula (I) or an N-oxide thereof or a salt thereof for controlling harmful arthropods or harmful nematodes, where R1 represents a hydrogen atom, R2 represents ORA2, R3, R7, R14, R17, R19, and R25 represent a hydrogen atom, R4 represents a methyl group, R5 represents a methyl group, R6 represents a hydrogen atom, R8 represents a hydrogen atom, R9 represents a methyl group, R10 represents a hydrogen atom, R11 represents ORA9, R12 represents a hydrogen atom, R13 represents a hydrogen atom, R15 represents a hydrogen atom, R16 represents a hydrogen atom, R18 represents a methyl group, R20 represents a hydrogen atom, R21 represents a methyl group, R22 represents a hydrogen atom, R23 represents a hydrogen atom, R24 represents a hydrogen atom, R26 represents a hydrogen atom, R27 represents a C1-C3 alkoxy group, and RA2 and RA9 represent a hydrogen atom.

Abstract: A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 ?m or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.

Abstract: The present invention provides a method for controlling a plant disease which comprises applying a compound represented by formula (I) [wherein Z represents a C1-C6 chain hydrocarbon group and the like, R1 and R2 are identical to or different from each other and represent a hydrogen atom or a fluorine atom, and R3, R4, R5, R6 and R7 are identical to or different from each other and represent a C1-C6 chain hydrocarbon group and the like] to a plant or a soil, which has excellent control efficacies against plant diseases.

Abstract: A glass substrate includes a pair of main surfaces, and an outer circumferential edge surface. The outer circumferential edge surface has a circular shape. A plurality of portions each of which has a defect, a hole, or glass alteration and extends in a thickness direction of the glass substrate are intermittently formed on the outer circumferential edge surface along a circumferential direction. The outer circumferential edge surface has a roundness not larger than 15 ?m.

Abstract: A disk-shaped glass plate includes a pair of main surfaces, and an outer circumferential edge surface. A thickness of the glass plate is not larger than 0.6 mm. The outer circumferential edge surface has a circular shape. The outer circumferential edge surface includes a plurality of portions each of which has a blemish, melting, degradation, or alteration. The plurality of portions are formed such that a predetermined space is formed between adjacent portions of the plurality of portions along a circumferential direction. The outer circumferential edge surface has a roundness not larger than 15 ?m.

Abstract: A method for manufacturing a glass substrate includes: flattening a to-be-scribed region extending along a predetermined to-be-scribed line on a surface of a glass blank by irradiating the surface of the glass blank with a first laser beam along the to-be-scribed line; and forming a scribe line along the to-be-scribed line by irradiating the flattened to-be-scribed region with a second laser beam.

Abstract: A method for manufacturing a glass substrate including an opening includes forming lines of inner and outer circumferential portions irradiated with a laser beam along substantially concentric circles in a surface of a glass blank, separating a portion on an inner side of the line of the outer circumferential portion of the glass blank and a portion on an outer side of the line of the outer circumferential portion from each other by heating the portion on the outer side of the line of the outer circumferential portion with radiant heat, and separating a portion on an inner side of the line of the inner circumferential portion of the glass blank and a portion on an outer side of the line of the inner circumferential portion from each other by heating the portion on the outer side of the line of the inner circumferential portion with radiant heat.

Abstract: A glass blank is cut out from a glass plate by forming a crack starting portion inside the glass plate by moving a first laser beam relative to the glass plate such that a focal position of the laser beam is located in an inner portion of the glass plate in its thickness direction and the focal position forms a circle when viewed from a surface of the glass plate, then causing cracks to develop from the crack starting portion toward main surfaces of the glass plate, and splitting the glass plate to separate, from the glass plate, a glass blank that includes a separation surface having an arithmetic average surface roughness Ra smaller than 0.01 ?m and a roundness not larger than 15 ?m. Thereafter, main surfaces of the glass blank are ground or polished.

Abstract: A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 ?m or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.

Abstract: A method for manufacturing an annular glass substrate includes: forming, on a glass blank, a separation line that includes a plurality of defects along a predetermined circle by irradiating a surface of the glass blank with a laser beam along the circle; and separating a portion outside the separation line of the glass blank on which the separation line was formed from a portion inside the separation line by heating the portion outside the separation line at a higher temperature than the portion inside the separation line. The separation line includes: a first region in which the defects are periodically formed and an interval between a pair of adjacent defects is a first interval; and a second region in which an interval between a pair of adjacent defects is shorter than the first interval.

Abstract: A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 ?m or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.

Abstract: An annular glass plate has an outer circumferential edge surface, an inner circumferential edge surface, and a thickness not larger than 0.6 mm. The outer circumferential edge surface and the inner circumferential edge surface are constituted by molten surfaces. The molten surfaces in the outer circumferential edge surface and the inner circumferential edge surface each have an arithmetic average surface roughness Ra not larger than 0.1 ?m and the surface roughness of the molten surface in the inner circumferential edge surface is larger than the surface roughness of the molten surface in the outer circumferential edge surface. The molten surfaces in the inner circumferential edge surface and the outer circumferential edge surface do not bulge relative to both main surfaces of the annular glass plate.

Abstract: A method for manufacturing a glass plate includes processing for irradiating an inner circumferential edge surface extending along an inner hole in an annular glass plate with a laser beam along the inner circumferential edge surface. When the inner circumferential edge surface is irradiated with the laser beam, the laser beam is concentrated by a condenser lens and formed into diffused light, and the inner circumferential edge surface is irradiated with the diffused light from a direction inclined with respect to a main surface of the glass plate.

Abstract: A method for manufacturing an annular glass plate that has an outer circumferential edge surface, an inner circumferential edge surface, and a thickness not larger than 0.6 mm includes processing for manufacturing an annular glass plate by irradiating each of the outer circumferential edge surface and the inner circumferential edge surface of an annular glass blank with a laser beam to melt the outer circumferential edge surface and the inner circumferential edge surface and form molten surfaces such that the molten surfaces in the outer circumferential edge surface and the inner circumferential edge surface each have an arithmetic average surface roughness Ra not larger than 0.1 ?m, and the surface roughness of the molten surface in the inner circumferential edge surface becomes larger than the surface roughness of the molten surface in the outer circumferential edge surface.

Abstract: In a method for manufacturing a glass plate that includes chamfering processing for chamfering an edge surface of a glass plate, the chamfering processing includes a step of forming a chamfered surface by irradiating the edge surface of the glass plate with a laser beam, and a step of heating the glass plate before the chamfered surface is formed. When a temperature of the glass blank at which the glass blank is heated is Tp [° C.], a glass transition point of the glass blank is Tg [° C.], and an average coefficient of linear thermal expansion of the glass blank is ? [1/° C.], (Tg?Tp)??5.67×107·?+840 is satisfied.

Abstract: A magnetic-disk glass substrate contains an alkaline earth metal component as a glass composition and includes a pair of main surfaces, and an outer circumferential side edge surface that is a mirror surface. The outer circumferential side edge surface includes a surface having a roughness percentage of 40% or more and 68% or less when a bearing ratio of a roughness cross-sectional area is 50% in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the outer circumferential side edge surface obtained after the outer circumferential side edge surface is etched by 2.5 ?m is measured. A glass transition point of the glass composition that constitutes the magnetic-disk glass substrate is 700° C. or more. The glass composition that constitutes the magnetic-disk glass substrate is alkali-free glass.