| 摘要 |
PURPOSE:To obtain a crystal oscillator with small size, large temperature gain and very slight change in oscillating frequency even when ambient temperature is changed by making the temperature change of the crystal oscillator very small against the change in the ambient temperature. CONSTITUTION:The 1st positive characteristic porcelain 2 is fitted to a metallic case outer wall of a crystal oscillator 1 in the way of heat conduction, the 2nd positive characteristic porcelain 5 is fitted to the bottom 4 of a metallic case 3 containing the crystal oscillator 1 and the 1st positive characteristic porcelain 2 in the way of heat conduction, and the positive characteristic porcelains 3 and 5 are connected electrically in series via the metallic case of the crystal oscillator 1 with a jumper 6. Further, a space is provided so that the crystal oscillator 1 does not directly contact with the positive characteristic porcelains 2,5. Then, the temperature change of the crystal oscillator 1 is made very small against the ambient temperature change. Thus, the change in the oscillating frequency is very slight even when the ambient temperature is changed and the crystal oscillator having small size and large temperature gain is obtained. |
