Patent ID: 8773005
Filing Date: 2014-07-08
Classification: H03H

Abstract:
1. A quartz-crystal device, comprising: an AT-cut quartz-crystal frame including a rectangular quartz-crystal vibrating portion, a rectangular frame portion surrounding the vibrating portion, and at least one joining portion, the vibrating portion having first, second, third, and fourth edges and first and second principal surfaces, the principal surfaces each including a respective excitation electrode, the frame portion comprising first, second, third, and fourth frame regions that are coupled together to form the rectangular frame, wherein the first frame region is a short side of the frame portion coupled at a right angle to the third frame region, the third frame region is a long side of the frame portion coupled at a right angle to the second frame region, the second frame region is a short side of the frame portion coupled at a right angle to the fourth frame region, and the fourth frame region is a long side of the frame portion coupled at a right angle to the first frame region, such that the first, second, third, and fourth frame regions are adjacent respective edges of the rectangular frame portion, the at least one joining portion coupling the vibrating portion to the frame portion at or near the first frame region; a package base bonded to the frame portion, the package base including first and second external electrodes situated at respective sites on an external principal surface of the package base, the first and second external electrodes being electrically connected via respective extraction electrodes to respective excitation electrodes on the vibrating portion; wherein the third frame region near its coupling with the first frame region includes a depth dimension and first and second plane surfaces that are parallel to respective principal surfaces of the vibrating portion, the third frame region also having an edge surface extending into the depth dimension and facing a corresponding edge surface of the vibrating portion, the edge surface of the third frame region including one or both of first and second sloped surfaces extending into the depth dimension from the first plane surface and second plane surface, respectively, to form a protrusion that projects toward the corresponding edge surface of the vibrating portion; and wherein the frame portion comprises a first extraction electrode extending via an joining portion from a respective excitation electrode to a respective external electrode, and further comprises a second extraction electrode extending from a respective excitation electrode to a respective external electrode via a joining portion, the first plane surface of the third frame region and the protrusion, or the second plane surface of the third frame region and the protrusion.