COVER MEMBER AND PORTABLE INFORMATION TERMINAL
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United States of America Patent
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Issued Date -
Jun 25, 2020
app pub date -
Mar 3, 2020
filing date -
Sep 11, 2017
priority date (Note) -
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Abstract
The present invention relates to a cover member (1) made of chemically strengthened glass for protecting an object to be protected, the cover member (1) being characterized by: at least one recessed part (7) being provided on at least one of a first main surface (3) and a second main surface (5) of the cover member (1); the cover member (1) integrally comprising a thin part (13) formed by the recessed part and a thick part (17) connecting with the thin part (13); and, defining tensile stress as positive and compressive stress as negative, the integral value S for main stress difference in the through-thickness direction of the thin part (13) at the position of the center of gravity of the thin part being less than 0 MPa.
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