Patent ID: 11884582
Assignee: HOYA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC C  B  G | IPC B  C  G

Claim 0:
1. 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, the method comprising:
irradiating each of an outer circumferential edge surface and an 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 μm 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.