| 摘要 |
PROBLEM TO BE SOLVED: To provide a quartz filter whose electric characteristics are improved by forming an appropriate bridging capacitance, and to prevent the deterioration of reliability due to a derived electrode for forming the bridging capacitance. SOLUTION: An input electrode 21 and an output electrode 22 are formed on the back face of a quartz diaphragm 2 with a predetermined interval, and one common electrode 23 corresponding to the input electrode 21 and the output electrode 22 is formed on the surface. A first drawing electrode 21a and a second drawing electrode 22a are respectively extended from the middle part of the long sides of the input electrode 21 and the output electrode 22 to directions far from each other, and derived electrodes 21b and 22b are formed from the edge parts of the short sides of the input electrode 21 and the output electrode 22, and the derived electrodes are extended to the short side direction of the quartz diaphragm, and then bent to the long side direction so as to be made adjacent to each other to form a bridging capacitance C. COPYRIGHT: (C)2004,JPO
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