Patent ID: 8030827
Filing Date: 2011-10-04
Classification: H03H

Abstract:
1. A crystal unit comprising: a metal base; at least two lead wires electrically insulated from the metal base and penetrating through the metal base; supporters connecting to apical ends of the lead wires, respectively; and a crystal blank supported by the supporters, each of said supporters comprising: the crystal blank comprising: wherein the stress sensitivity zero axis is an axis direction where change in vibration frequency of the crystal blank with respect to stress will be at a minimum, wherein the crystal blank is placed on the tongue portions of the supporters at the outer circumference thereof where at least the pair of extraction electrodes are extended to such that the crystal blank is held by the supporters over the metal base in such a way as to become parallel with the principal surface of the metal base, and the crystal blank is fixed to the supporters by conductive adhesives, and wherein each of said conductive adhesives includes: a first portion formed between the tongue portion and a lower surface of the crystal blank; a second portion extending to an end face of the crystal blank from an outer surface of the supporter and through the slit; and a third portion formed between an inner surface of the supporter and an upper surface of the crystal blank.