Kabushiki Kaisha Suwa Seikosha

Matsushima Kogyo Kabushiki Kaisha

Matsushima Kogo Kabushiki Kaisha

Yukio Hara

Masatoshi Kobayashi

Hiroyuki Fujii

George Shimakawa

Kabushiki Kaisha Seikosha

Joji Shimakawa

A quartz crystal oscillator including a quartz crystal plate defining a tuning fork having a base, two vibratory tines extending from the base and a frame integrally extending from the base and surrounding the tines is provided. The quartz crystal plate is disposed between two cooperating case members in the region of the base and frame. Thin metallic electrodes are disposed on the opposed planar surfaces of the quartz crystal plate. A through-hole or opening is formed in the base region of the vibrator plate for electrically connecting an electrode from one planar surface of the plate to the opposed planar surface for providing two external terminals on one surface case member. The electrical connection through the through-hole or opening is a thin metal film disposed by sputtering or deposition.

Quartz crystal oscillator

A quartz crystal oscillator package comprising a quartz crystal vibrator leaf enclosed in an evacuated housing. The vibrator leaf frame is sandwiched and sealed between a pair of housing elements formed by etching at one time the periphery of each housing element and at another time etching a concave portion in each housing element. Opposed concave portions provide the internal volume wherein the vibrator leaf is sealed under vacuum. Using heat and vacuum, a metal film deposited on the sealing surfaces of the housing elements fuses with a binder material to form a eutectic alloy seal. A flat package having small size, high structural strength, an excellent hermetic seal, and high internal vacuum is produced by this method.

Method of making a quartz crystal oscillator

Method of producing housing element for quartz crystal oscillator

Growing community of inventors

Nagano, Japan

Yukio Hara