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US 2019/0169060 A1Published application
Selectively heat-treated glass-ceramic for an electronic device
AssigneeApple Inc.
InventorsChristopher D. Jones, Matthew S. Rogers, Que Anh S. Nguyen
Life of this patent
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Abstract
The embodiments disclosed herein are directed to forming selectively heat-treated glass-ceramic parts for use in an electronic device. In various embodiments, glass-ceramic parts, such as a cover sheet, may have multiple different regions having different objectives for material properties such as optical properties, strength, fracture toughness, hardness, and the like. Different regions may be selectively heat treated to achieve desired results.
Claims20
A method for forming a glass-ceramic part comprising:
- heating a first region of a glass part to a first temperature that is at or above a crystallization temperature of the glass part;
- and
- maintaining a second region of the glass part at or below a second temperature that is below the first temperature, thereby converting the glass part to the glass-ceramic part, such that:
- the first region has a first median crystal size;
- and
- the second region has a second median crystal size that is less than the first median crystal size.
3 more elements
A method for forming a glass-ceramic part comprising:
- heating a first region of a glass part to a first temperature that is at or above a nucleation temperature of the glass part;
- maintaining a second region of the glass part at or below a second temperature that is below the first temperature;
- and
- subsequently heating the first region of the glass part to a third temperature that is at or above a crystallization temperature of the glass part, thereby converting the glass part to the glass-ceramic part, such that:
- the first region has a first crystal density;
- and
- the second region has a second crystal density that is less than the first crystal density.
4 more elements
An electronic device comprising:
- a display;
- a housing;
- a cover sheet affixed to the housing and positioned adjacent to the display, the cover sheet comprising:
- a first region having an optical haze and a first median crystal size;
- and
- a second region having a second median crystal size that is smaller than a crystal size that causes scattering of light.
3 more elements
Dependencies are inferred from the claim text.