Cap housing, cap, and semiconductor device

Abstract

A cap housing includes a tubular part, and a top plate, extending from one end toward a center axis of the tubular part, and having an opening. The top plate includes an annular first surface facing the opening, an annular second surface continuous with the first surface and perpendicular to the center axis, and an annular third surface continuous with the second surface and inclined from the second surface. The third surface is inclined from the second surface so as to separate farther away from a center of the tubular part in a direction along the center axis as the third surface approaches the tubular part. A second size of the second surface on a straight line perpendicular to the center axis and passing through the center axis is smaller than or equal to a first size of the first surface in a direction along the center axis.

Dependencies are inferred from the claim text.