Kabushiki Kaisha Suwa Seikosha

Matsushima Kogyo Kabushiki Kaisha

Matsushima Kogo Kabushiki Kaisha

George Shimakawa

Masatoshi Kobayashi

Yukio Hara

Hiroyuki Fujii

Kabushiki Kaisha Seikosha

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

An improved numeric display is based on the usual seven-segment display, but the segments are both curved and straight in the interest of making the display more legible than the usual segmented display. A particular feature is the division of the usual lower left-hand segment into three portions, all of which are activated simultaneously, as a result of which those numerals involving the lower left-hand segment and the bottom segment are enhanced in appearance. Moreover, the corners of the display are rounded, a feature which improves both the legibility and the appearance of the display.

Numeric display configuration

Growing community of inventors

Nagano, Japan

George Shimakawa