| 摘要 |
PURPOSE:To prevent position offset of a film added with a mass by providing a plate positioned in parallel with a face of a piezoelectric vibrator and having a holder for adjusting frequency of a holding spring holding the piezoelectric vibrator. CONSTITUTION:Air-tight glass is filled in the inside of a metal base 1, vibrator holding springs 4, 5 are fixed to the upper end of terminal pins 2, 3 penetrating this base and a crystal vibrator 6 on both faces of which electrode film is formed is held. A plate (mask) 7 is bent incorporatedly to the one holding spring 4 and a hole 8 for adjusting frequency is formed to this mask. In adjusting the frequency of a crystal vibrator 6, the mask 7 is formed at a low position and the crystal vibrator 6 is positioned to an upper position, an electrode film material such as silver is vaporized and scattered through the hole 8 from the lower direction and vapor-deposited to the center part of the electrode film of the crystal vibrator 6 so as to form vapor-deposition film. Then, the crystal vibrator 6 is vibrated and the said adjustment is attained until the frequency is coincident with a desired value. |
