Patent ID: 11964344
Assignee: AGC INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A glass substrate for a semiconductor package, comprising:
a first principal surface;
a second principal surface;
at least one hollowed-out portion; and
a plurality of through hole formed in a surrounding of the at least one hollowed-out portion,
wherein in a section of the plurality of hollowed-out portion taken in a direction perpendicular to the first principal surface, a minimum diameter of the plurality of hollowed-out portion is smaller than an opening diameter of the plurality of hollowed-out portion at each of the first principal surface and the second principal surface,
wherein an inner wall of the plurality of hollowed-out portion has a sawtooth shape,
wherein in a plan view of the first principal surface, the sawtooth shape has a shape in which groove portions in an arc shape and protruding portions are arranged alternately, each of the protruding portions being arranged between two neighboring groove portions of the groove portions, and
wherein where a spacing, on the first principal surface, between the two neighboring protruding portions of the protruding portions of the sawtooth shape is denoted as P1, and an opening diameter of the plurality of through hole is denoted as d1, an expression P1<0.8−d1 is satisfied.