JPS5491093A - Contour sliding crystal vibrator - Google Patents

Abstract

PURPOSE:To reduce an equivalent resistance, to increase a Q value, and to make it possible to use a vibrator with its constitution miniaturized for a wrist watch, etc., by shaping the plate surface of the vibrator into a circle. CONSTITUTION:At the center part of the plate surface of circular contour sliding vibrator 7, nearly-square electrode 8 is arranged, the plate-surface center part which is the knot of vibrations is supported from both sides by support material 9 making electric connections, and an electric field is applied by support material 9 in the thickness direction of the plate surface, namely, the Z' direction. Since this vibrator is supported at the knot of vibrations, the loss of vibrations caused by supporting is suppressed and the Q value is prevented from lowering. Because of the circular plate surface, this vibrator has no maximum vibration displacement parts, namely, four corners of a conventional quadrilateral contour sliding vibrator and air resistance becomes small which contributes greatly to equivalent resistance, so that a vibrator with a high Q value can be obtained. In addition, this vibrator can be miniaturized as much as sizes of four corners cut off. Further, using a DT cut crystal vibrator of excellent frequency-temperature characteristics as a vibrator is more effective.