METHOD OF MAKING A MIRROR SUBSTRATE FOR AN INTERIOR REARVIEW MIRROR ASSEMBLY FOR A VEHICLE
First Claim
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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Abstract
A method of making a mirror substrate for a vehicular mirror assembly includes providing a glass substrate and fixturing the glass substrate at a fixture to support the glass substrate. A rotatable grinding wheel is presented to the front perimeter portion of the glass substrate and the front perimeter portion of the glass substrate is ground to establish a ground rounded surface about and around the periphery of the glass substrate. After grinding the front perimeter portion of the glass substrate to establish the ground rounded surface, a rotatable polishing wheel is presented to the ground rounded surface and the ground rounded surface is polished to establish a polished rounded surface about and around the periphery of the glass substrate. The polished rounded surface provides a smooth transition between the front surface of the glass substrate and a rear portion of the circumferential perimeter edge of the glass substrate.
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Citations
37 Claims
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1. A method of making a mirror substrate for an interior rearview mirror assembly for a vehicle, said method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of making a mirror substrate for an interior rearview mirror assembly for a vehicle, said method comprising:
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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; attaching said grinding wheel to a movable head and 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 while moving said movable head and said grinding wheel along 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, and wherein, during grinding, said movable head indexes at a rate of between 120 in/min and 400 in/min; 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; 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; and wherein the polished rounded surface has a radius of curvature of at least 2.5 mm. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of making a mirror substrate for an interior rearview mirror assembly for a vehicle, said method comprising:
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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; providing a rotatable polishing wheel; attaching said grinding wheel to a movable head and presenting said grinding wheel to the front perimeter portion of the glass substrate; wherein said movable head is movable under computer control around the periphery 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; 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 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; and wherein the polished rounded surface has a radius of curvature of at least 2.5 mm. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification