| 摘要 |
There is provided a crystal device in which an area inside a ceramic case is made larger to increase the design freedom of a crystal unit (crystal element). In a crystal device for surface mounting which is configured such that at least a crystal element 2 is housed in a ceramic case 1 in a rectangular form in plan view, which is composed of a bottom wall 1a and a frame wall 1b, and whose cross section is formed to be concave, and a metal cover 3 is jointed to a metal ring 4 provided at an end face of the opening of the ceramic case 1 by seam welding, to hermetically encapsulate the crystal element 2, one of the widths of the long side and the short side of the metal ring is shorter than the other one.
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