SURFACE MOUNTING QUARTZ CRYSTAL UNIT AND METHOD OF FABRICATING THE SAME
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United States of America Patent
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app pub date -
Oct 14, 2014
filing date -
Nov 29, 2013
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Abstract
A surface mounting quartz crystal unit includes a ceramic substrate, a holding terminal, a metal cover, a signal line terminal and a ground terminal, and a metal layer. The holding terminal holds a crystal resonator on the substrate. The metal cover is arranged to cover the crystal resonator. The signal line terminal and a ground terminal are formed on a rear surface of the substrate. The metal layer bonds the substrate to the metal cover at a part on a front surface of the substrate. The part is in contact with the metal cover. The substrate has a first through via inside the substrate. The first through via connects the holding terminal to the signal line terminal. The substrate has a through conductor at the substrate. The through conductor connects the metal layer to the ground terminal.
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