Crystal device for surface mounting

Details Crystal device for surface mounting Crystal device for surface mounting

2011-04-05

2011-04-05

Pascal, Robert (Department: 2817)

Oscillators

With outer casing or housing

C331S158000, C310S311000

Reexamination Certificate

active

07920031

ABSTRACT:
A surface-mounted device includes a ceramic case, which has a concave portion formed by a bottom wall layer, a frame wall intermediate layer and a frame wall upper layer, and which houses at least a crystal element inside the concave portion. The ceramic case includes: arc-formed notched parts at outer circumference four corners thereof; and mounting terminals, which are extended to notched parts in the bottom wall layer among the notched parts, on an outer bottom face thereof. A radius of curvature of the notched parts in the frame wall intermediate layer is made identical to or greater than a radius of curvature of the notched parts in the bottom wall layer, and a radius of curvature of the notched parts in the frame wall upper layer is less than the radii of curvature of the notched parts in the bottom wall layer and the frame wall intermediate layer.

REFERENCES:
patent: 6452311 (2002-09-01), Serizawa
patent: 6998926 (2006-02-01), Miyazaki et al.
patent: 2003-068921 (2003-03-01), None
patent: 2003218265 (2003-07-01), None
patent: 2003-243559 (2003-08-01), None
patent: 2006-303919 (2006-11-01), None

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