Patent ID: 7952440
Filing Date: 2011-05-31
Classification: H03H

Abstract:
1. A crystal device for surface mounting comprising: a ceramic case, which has a rectangular shape in a plan view, which cross section is formed to be concave by a bottom wall and a frame wall, and which houses at least a crystal element; a metal ring, which has an annular shape, and which is provided at an end face of an opening of the ceramic case; and a metal cover, which planar outline is made smaller than that of the metal ring, wherein the crystal device for surface mounting is configured such that: an outer circumferential surface of the metal cover is spaced from the outer circumference of the metal ring so as to face a surface of the metal ring to be seam-welded to the surface of the metal ring, to hermetically encapsulate the crystal element; one of the widths of a long side and a short side of the metal ring is made narrower than the other one; one of the widths of a long side and a short side of the frame wall is made narrower than the other one; and one of the widths of a long side and a short side of the metal cover facing the surface of the metal ring is made narrower than the other one.