Patent ID: 7745978
Filing Date: 2010-06-29
Classification: H01L,H03H

Abstract:
1. A quartz crystal device comprising: a crystal blank having an outer perimeter part and a vibration region partially separated mechanically from the outer perimeter part by a cut-out groove; a first container joined to a first principal surface of said crystal blank by being joined to an entire perimeter of the outer perimeter part of aid crystal blank via a brazing material layer in the first principal surface; and a second container joined to a second principal surface of said crystal blank by being joined to an entire perimeter of the outer perimeter part of said crystal blank via a brazing material layer in the second principal surface; wherein the vibration region of said crystal blank is hermetically encapsulated in a space formed by said first container, said second container and the outer perimeter part of said crystal blank; wherein said crystal blank has a substantially rectangular planar outer shape, and by forming said cut-out groove continuously along three sides of an outer perimeter of said crystal blank, said vibration region mechanically connects to said outer perimeter part as an integral piece only in a connection region along one side of said outer perimeter, wherein said crystal blank comprises: wherein an IC chip on which a circuit electrically connected to said crystal connection terminals and using said crystal blank is integrated is hermetically encapsulated in said space together with said vibration region.