Patent ID: 9481303
Filing Date: 2016-11-01
CPC Classification: B24B,B60R,C03C,G02B,G02F

Claim Text:
1. A method of making a mirror substrate for an interior rearview mirror assembly for a vehicle, said method comprising: providing a glass substrate having a generally planar front surface, a generally planar rear surface and a circumferential perimeter edge about a periphery of said glass substrate and extending between said front and rear surfaces, wherein said front surface and said perimeter edge meet at a front perimeter portion of said glass substrate that circumscribes said glass substrate; aligning and fixturing said glass substrate at a fixture to support and position said glass substrate; providing a grinding wheel that is rotatable about a grinding wheel axis; providing a polishing wheel that is rotatable about a polishing wheel axis; presenting said grinding wheel to said front perimeter portion of said glass substrate; grinding said front perimeter portion of said glass substrate by moving said grinding wheel around the periphery of said front perimeter portion of said glass substrate while rotating said grinding wheel about said grinding wheel axis to establish a ground generally rounded surface about and around the periphery of said glass substrate; and after grinding said front perimeter portion of said glass substrate to establish said ground generally rounded surface, presenting said polishing wheel to said ground generally rounded surface and polishing said ground generally rounded surface by moving said polishing wheel around the periphery of said glass substrate while rotating said polishing wheel about said polishing wheel axis to establish a polished generally rounded surface about and around the periphery of said glass substrate, wherein said polished generally rounded surface provides a smooth transition between said generally planar front surface of said glass substrate and a rear portion of said circumferential perimeter edge of said glass substrate.