16-01-2020 дата публикации
Номер: US20200017406A1
Принадлежит:
A glass sheet having asymmetric chemical strengthening is disclosed and described. The examples described herein are directed to a cover glass for an electronic device and other glass components that may be used as enclosure elements or may form an enclosure. Within the glass component, localized compressive stress regions may be formed on opposite sides of the glass component, which may help arrest or redirect propagating cracks or defects in the glass. The opposing compressive stress regions may also help maintain the overall flatness of the component while increasing strength and/or impact resistance of the component. 1. A cover glass for an electronic device , the cover glass comprising:a front surface;a first compressive stress region extending from the front surface to a first depth into the cover glass;a second compressive stress region extending from the front surface to a second depth, less than the first depth, into the cover glass;a rear surface opposite to the front surface;a third compressive stress region extending from the rear surface toward the first compressive stress region and to a third depth into the cover glass; anda fourth compressive stress region extending from the rear surface toward the second compressive stress region and to a fourth depth, greater than the third depth, into the cover glass.2. The cover glass of claim 1 , further comprising:a first tensile stress region positioned between the first compressive stress region and the third compressive stress region; anda second tensile stress region positioned between the second compressive stress region and the fourth compressive stress region.3. The cover glass of claim 2 , wherein a first centerline of the first tensile stress region is offset with respect to a second centerline of the second tensile stress region.4. The cover glass of claim 1 , wherein:the second compressive stress region at least partially surrounds the first compressive stress region; andthe fourth compressive stress ...
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