Nihon Dempa Kogyo Co., Ltd.

Yukihiro Okajima

Tatsuya Fujita

A quartz-crystal vibrating piece includes an element unit, excitation electrodes, and an extraction electrode. The element unit includes a vibrator, a first thick portion, and second thick portions. The vibrator has a quadrilateral shape in plan view, vibrates in a thickness-shear mode, and has a thickness t1. The first thick portion has a rectangular shape in plan view, has a short side connected to one side of the vibrator, extends in a first direction, and has a thickness t2 thicker than the thickness t1. The second thick portions are connected to both side surfaces of an end portion of the first thick portion in an opposite side of the vibrator. Each of the second thick portions extends along a second direction intersecting with the first direction and having a thickness t3 thicker than the thickness t1 and same as or different from the thickness t2.

Quartz-crystal vibrating piece, crystal unit, crystal controlled oscillator, and intermediate wafer for quartz-crystal vibrating piece

A surface mount quartz crystal oscillator comprises a package body having a recess, a quartz crystal blank having extending electrodes extending from the outer periphery of the crystal blank, an IC (integrated circuit) chip secured to an inner bottom surface of the recess and having at least an oscillator circuit connected to the crystal blank, and an insulator disposed on the IC chip. A pair of conduction terminals are disposed on an inner wall surface of the recess and electrically connected to the IC chip. The crystal blank is secured to the insulator with a conductive adhesive at positions from which the extending electrodes are extended, and the conductive adhesive electrically connects each extending electrode to one conduction terminal associated therewith.

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Saitama, Japan

Yukihiro Okajima