Method for manufacturing glass plate, method for manufacturing magnetic-disk glass substrate, and method for manufacturing magnetic disk
AssigneeHoya Corporation
InventorsToshio Takizawa, Shuhei Azuma
Life of this patent
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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.
Claims10
A method for manufacturing a glass plate, the method comprising:
- chamfering processing for chamfering an edge face of a disk-shaped glass plate,
- the chamfering processing including,
- 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
- 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 a center of the glass plate, and heating the softened portion of the edge face that has reached the heating space through the rotation,
- wherein a region of a main surface of the glass plate that is disposed in the heating space is more than or equal to half the area of the main surface of the glass plate.
Dependencies are inferred from the claim text.