US 11,691,912 B2
Chemically strengthened and textured glass housing member
Masashige Tatebe, Kakogawa (JP); Takahiro Oshima, Nerima-ku (JP); Jody Akana, San Francisco, CA (US); Palaniappan Chinnakaruppan, Cupertino, CA (US); Tushar S. Deshpande, San Jose, CA (US); Kenichi Nakajima, Fujisawa (JP); Shigehiro Sanichi, Osaka (JP); Takashi Kato, Osaka (JP); and Koji Takano, Osaka (JP)
Assigned to APPLE INC., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Oct. 21, 2019, as Appl. No. 16/659,173.
Claims priority of provisional application 62/781,542, filed on Dec. 18, 2018.
Prior Publication US 2020/0189973 A1, Jun. 18, 2020
Int. Cl. B32B 15/04 (2006.01); B32B 17/06 (2006.01); C03C 21/00 (2006.01); C03C 17/04 (2006.01); C03C 3/083 (2006.01); H01M 50/124 (2021.01); C03C 17/00 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/083 (2013.01); C03C 17/007 (2013.01); C03C 17/04 (2013.01); H01M 50/124 (2021.01); H01M 50/1245 (2021.01); C03C 2203/52 (2013.01); C03C 2217/77 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A glass member for a housing of an electronic device, comprising:
an aluminosilicate glass substrate defining a first surface of the glass member, the first surface having a first average surface roughness (Ra) below 1 micron;
a fused composite coating bonded to a portion of the aluminosilicate glass substrate and comprising:
an amorphous glass matrix having a softening temperature that is lower than a softening temperature of the aluminosilicate glass substrate and a coefficient of thermal expansion that is greater than the coefficient of thermal expansion of the aluminosilicate glass substrate; and
crystalline particles having a softening temperature that is higher than the softening temperature of the amorphous glass matrix and a coefficient of thermal expansion that is less than the coefficient of thermal expansion of the amorphous glass matrix, the crystalline particles dispersed in the amorphous glass matrix and extending from a surface of the amorphous glass matrix, thereby defining a textured second surface of the glass member, the textured second surface having a second average surface roughness (Ra) between 1 micron and 10 microns;
a first ion-exchanged layer extending into the glass member and through the fused composite coating; and
a second ion-exchanged layer extending into the glass member from the first surface.