Methods of cutting a laminate strengthened glass substrate
First Claim
1. A method of cutting a laminate strengthened glass substrate, the method comprising:
- providing a laminate strengthened glass substrate comprising;
a glass core layer having a first surface portion and a second surface portion opposite the first surface portion;
at least one glass cladding layer fused to the first surface portion or the second surface portion of the glass core layer, wherein the glass core layer has an average core coefficient of thermal expansion CTEcore, and the at least one glass cladding layer has an average cladding coefficient of thermal expansion CTEcladding which is less than the average core coefficient of thermal expansion CTEcore;
forming an edge defect at an edge of the laminate strengthened glass substrate;
heating a first region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the first region is offset from a first side of a desired line of separation;
heating a second region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the second region is offset from a second side of the desired line of separation, and the second region is simultaneously heated with the first region; and
propagating a crack along the desired line of separation between the first and second regions of the laminate strengthened glass substrate, wherein the crack is initiated at the edge defect.
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Abstract
Methods of cutting laminate strengthened glass substrates are disclosed. A method is disclosed which includes providing a laminate strengthened glass substrate having a glass core layer with first and second surface portions, and at least one glass cladding layer fused to the first surface portion or the second surface portion of the glass core layer. The glass core layer has a core coefficient of thermal expansion that is larger than a cladding coefficient of thermal expansion. The method further includes forming an edge defect on the laminate strengthened glass substrate, heating first and second regions of the laminate strengthened glass substrate on the at least one glass cladding layer. The first and second regions are offset from first and second sides of a desired line of separation, respectively. The method further includes propagating a crack imitated at the edge defect between the first and second regions.
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Citations
20 Claims
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1. A method of cutting a laminate strengthened glass substrate, the method comprising:
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providing a laminate strengthened glass substrate comprising; a glass core layer having a first surface portion and a second surface portion opposite the first surface portion; at least one glass cladding layer fused to the first surface portion or the second surface portion of the glass core layer, wherein the glass core layer has an average core coefficient of thermal expansion CTEcore, and the at least one glass cladding layer has an average cladding coefficient of thermal expansion CTEcladding which is less than the average core coefficient of thermal expansion CTEcore; forming an edge defect at an edge of the laminate strengthened glass substrate; heating a first region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the first region is offset from a first side of a desired line of separation; heating a second region of the laminate strengthened glass substrate on the at least one glass cladding layer, wherein the second region is offset from a second side of the desired line of separation, and the second region is simultaneously heated with the first region; and propagating a crack along the desired line of separation between the first and second regions of the laminate strengthened glass substrate, wherein the crack is initiated at the edge defect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cutting a laminate strengthened glass substrate, the method comprising:
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providing a laminate strengthened glass substrate comprising; a glass core layer having a first surface portion and a second surface portion opposite the first surface portion; at least one glass cladding layer fused to the first surface portion or the second surface portion of the glass core layer, wherein the glass core layer has an average core coefficient of thermal expansion CTEcore, and the at least one glass cladding layer has an average cladding coefficient of thermal expansion CTEcladding which is less than the average core coefficient of thermal expansion CTEcore; forming a first reduced central tension zone extending along a desired line of separation, wherein the first reduced central tension zone is offset from a first side of the desired line of separation, and the first reduced central tension zone has a reduced tension CT1 that is less than a center tension CT2 along the desired line of separation; forming a second reduced central tension zone extending along the desired line of separation, the second reduced central tension zone is offset from a second side of the desired line of separation, and the second reduced central tension zone has the reduced center tension CT1 that is less than the center tension CT2 along the desired line of separation; and propagating a crack along the desired line of separation between the first reduced central tension zone and the second reduced central tension zone. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification