US 12,408,282 B2
Electronic devices having differentially strengthened cover members
Christopher C. Bartlow, Menlo Park, CA (US); Dale N. Memering, Langhome, PA (US); and Tyler A. Marshall, Sunnyvale, CA (US)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Nov. 15, 2022, as Appl. No. 17/986,959.
Claims priority of provisional application 63/300,984, filed on Jan. 19, 2022.
Prior Publication US 2023/0232558 A1, Jul. 20, 2023
Int. Cl. H05K 5/03 (2006.01); C03C 21/00 (2006.01); H05K 5/00 (2006.01)
CPC H05K 5/03 (2013.01) [C03C 21/002 (2013.01); H05K 5/0018 (2022.08); H05K 5/0086 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device comprising:
an optical component;
a display; and
an enclosure at least partially enclosing the optical component and comprising a cover member defining an exterior surface and an interior surface, the cover member comprising:
a first chemically strengthened zone defining a first stress profile comprising a first region of compressive stress extending from the exterior surface to the interior surface; and
a second chemically strengthened zone positioned over the optical component, surrounded by the first chemically strengthened zone, and defining a second stress profile comprising:
a second region of compressive stress extending from the exterior surface;
a third region of compressive stress extending from the interior surface; and
a region of tensile stress between the second and the third regions of compressive stress; and
a third chemically strengthened zone positioned over the display and surrounding the first chemically strengthened zone, the third chemically strengthened zone defining a third stress profile different than the first stress profile.