Thermally strengthened consumer electronic glass and related systems and methods
AssigneeCorning Incorporated
InventorsPeter Joseph Lezzi, Richard Orr Maschmeyer, John Christopher Thomas, Kevin Lee Wasson
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Abstract
A strengthened cover glass or glass-ceramic sheet or article as well as processes and systems for making the strengthened glass or glass-ceramic sheet or article is provided for use in consumer electronic devices. The process comprises cooling the cover glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened cover glass sheets for use in or on consumer electronic products.
Claims20
A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween;
- wherein an average thickness between the first and second major surfaces is less than 2 mm;
- wherein an ion content and chemical constituency of at least a portion of both the first major surf ace and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
- wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- wherein a surface roughness of the first major surface is between 0.2 and 1.5 nm Ra roughness.
A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween;
- wherein an average thickness between the first and second major surfaces is less than 2 mm;
- wherein an ion content and chemical constituency of at least a portion of both the first major surf ace and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
- wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- wherein a surface roughness of the first major surface is between 0.2 and 1.5 nm Ra roughness, and wherein a surface roughness of the second major surface is between 0.2 and 1.5 nm Ra roughness;
- wherein stress within the glass sheet varies as a function of position relative to the first and second major surfaces, wherein the stress has a change of at least 200 MPa over a distance of less than 500 μm of thickness of the glass sheet.
A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
- a first major surface opposite a second major surface with an interior region located therebetween;
- wherein an average thickness between the first and second major surfaces is less than 2 mm;
- wherein an ion content and chemical constituency of at least a portion of both the first major surf ace and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
- wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
- wherein a surface roughness of the first major surface is between 0.2 and 1.5 nm Ra roughness;
- wherein the areas of the first and second major surfaces are at least 2500 mm2;
- wherein thickness of the glass sheet is about 0.1 mm to about 1.5 mm, and wherein the glass sheet further comprises a depth of compression that is greater than 17% of the thickness.
Dependencies are inferred from the claim text.