Method of making a mirror substrate for an interior rearview mirror assembly for a vehicle

  • US 10,189,407 B2
  • Filed: 10/31/2016
  • Issued: 01/29/2019
  • Est. Priority Date: 04/23/2009
  • Status: Active Grant
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First Claim
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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 the glass substrate and extending between the front and rear surfaces, wherein the front surface and the perimeter edge meet at a front perimeter portion of the glass substrate that circumscribes the glass substrate;

    fixturing the glass substrate at a fixture to support the glass substrate;

    providing a rotatable grinding wheel, said grinding wheel comprising a grit level between 150 and 200;

    providing a rotatable polishing wheel, said polishing wheel comprising a grit level between 200 and 500;

    presenting said grinding wheel to the front perimeter portion of the glass substrate;

    grinding the front perimeter portion of the glass substrate via rotating said grinding wheel when said grinding wheel is at the front perimeter portion of the glass substrate to establish a ground rounded surface about and around the periphery of the glass substrate, wherein, during grinding, said grinding wheel rotates at between 4,000 RPM and 6,000 RPM;

    after grinding the front perimeter portion of the glass substrate to establish the ground rounded surface, presenting said polishing wheel to the ground rounded surface and polishing the ground rounded surface via rotating said polishing wheel when said polishing wheel is at the ground rounded surface to establish a polished rounded surface about and around the periphery of the glass substrate, wherein, during polishing, said polishing wheel rotates at between 3,000 RPM and 4,000 RPM; and

    wherein the polished rounded surface provides a smooth transition between the generally planar front surface of the glass substrate and a rear portion of the circumferential perimeter edge of the glass substrate.

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