Citizen Watch Company, Ltd.

Miyota Co., Ltd.

Other

Cimeo Precision Co., Ltd.

Toshinori Ide

Hisao Wakabayashi

Makoto Wakasugi

Hiroaki Takayanagi

Kiyoshi Uchibori

Toshimitsu Aruga

Toshihide Ooi

Toshiya Hayashi

Shinji Nakayama

Takeshi Murata

In a piezoelectric vibrator having a center supporting piezoelectric vibrating reed, one edge of an almost rectangular piezoelectric vibrating reed is fixed at two places of a case by a comparatively hard conductive adhesive. Also, the other edge facing the above-mentioned one edge is fixed at two other places of the case by a comparatively soft adhesive. Further, the case and a lid to cover the piezoelectric vibrating reed which constitute a container for the piezoelectric vibrator are sealed using a glass material having a low melting point of 340&deg; C. or less. Further, in the case of a cantilever supporting piezoelectric vibrating reed, stoppers made of soft adhesive are formed at the top and bottom of the other edge facing the above-mentioned one edge with a slight clearance being provided.

Piezoelectric vibrator

A base (,) has a substantially cylindrical plug (,) penetrated by two leads,A piezoelectric oscillator (,) is secured to and supported on ends of the two leads by supports (,). The supports (,) are formed from solder having as high lead content of more than 60% by weight, preferably 85 to 98% by weight. A cap (,) open at one end is fitted on the piezoelectric oscillator (,). The plug (,) seals the open end of the cap (,) and forms a gas-tight casing, thus forming a piezoelectric oscillator unit with piezoelectric oscillator (,) held gas-tight in the inside. The high lead content solder is soft and has a low Young's Modulus, so that it can disperse stress when the piezoelectric oscillator experiences. It is thus possible to evade stress concentration on the piezoelectric oscillator (,) and improve shock resistance. A layer of a solder with a lead content of 60% by weight or less or of tin or a tin alloy, is formed on the surface of the leads (,), and ensures solder wetting property.

Piezo-electric transducer unit

Container for enclosing a piezo-electric transducer

A piezoelectric oscillator comprises a piezoelectric oscillating reed, an insulating substrate for retaining the piezoelectric oscillating reed, and a cap fixed onto the top surface of the insulating substrate for enclosing the piezoelectric oscillating reed. Four connecting electrodes are formed on the top surface of the insulating substrate for electrical connection to the oscillating reed, which are divided into two groups. Each group includes two connecting electrodes which are connected to each other by metal interconnects. The insulating substrate is rectangular, and two connecting electrodes, each of which belong to one group, are located along the shorter sides of the insulating substrate. On the bottom surface of the insulating substrate, at least two external electrodes are formed, to which metal interconnects for each group are connected through the side surface of the insulating substrate.

Piezolelectric oscillator

Growing community of inventors

Saku, Japan

Toshinori Ide