SURFACE MOUNTING PIEZOELECTRIC OSCILLATOR

摘要

PROBLEM TO BE SOLVED: To store a crystal piece and an integrated element in the surface and back side recesses separately and also prevent the abnormal oscillation and the variation of frequency by forming a shielding electrode on a bottom wall layer to electrically isolate a piezoelectric piece from the integrated element and eliminating a closed loop of high frequency that is formed between the input and output sides of an oscillating amplifier. SOLUTION: A shielding electrode 18 is formed on the surface of a bottom wall layer 4 and covered with an area that is equal to or wider than an exciting electrode. The electrode is connected to a mounting terminal serving as a ground electrode via an electrode through-hole 11 at the side opposite to a single extending outer circumference part of a drawer electrode. In such a constitution, the electrode patterns formed on the back sides of the integrated element and the layer 4 are electrically independent of a crystal piece via the electrode 18 that is grounded. Thus, the electrostatic or electromagnetic connection is prevented between the output terminal side of an oscillating amplifier contained in the integrated element and the exciting electrode of the crystal piece in particular that serves as the input side of the oscillating amplifier. As a result, a closed loop that is formed between the input and output sides of the oscillating amplifier can be eliminated and also the abnormal oscillation can be prevented.