低周波スパイラル水晶振動子

抄録

"SPIRAL CRYSTAL VIBRATOR" is our coined word. This new type spiral has been defined as ARCHIMEDES' spiral band with several turns, having the larger band width than its thickness. Clamping in the vicinity of its outside terminal, every part of spiral can be caused to move in normal direction of the band width. This results primarily a tortional moment acting on the cross section of every Part of spiral band. The situation is analogous to that of A CONICAL COIL SPRING. The device for maintaining vibrations is realized by using a electromagnetic transducer for pick up and drive functions. Typical frequency is only 156 Hz. It is also available in frequency range from 130 to 800 Hz. This paper presents the results as follows; A mathema tical statement of equation concerning to frequency. Temperetuteecoefficient of frequency vs. crystal cuts of plates. Vacuum sealing effect of glass tube to attain high Q value. Summarized aging data for a few months.