| 摘要 |
PURPOSE:To obtain a stable high frequency oscillation block without no leakage of magnetic flux and frequency change in vibration by providing an adjusting hole for oscillating frequency to a printed board and a bottom plate. CONSTITUTION:An oscillation coil 11 whose face except the lower face is shielded by a shield case 5 is fitted to an upper face of the board 2 and a set component 10 and a connecting terminal 4 are soldered to the lower part. They are shielded completely by a shield case 1 and the bottom plate 3. Then the frequency adjusting hole 9 is provided to the board 2 at the lower part of the oscillation coil 11 and a hole 3a is provided to the bottom plate 3. Thus, since no hole is provided to the ceiling of the shield case 5 of the oscillation coil 11, no leakage of magnetic flux exists and even when the shield case 1 is vibrated from external vibration, no frequency change is caused and a stable high frequency oscillation block is obtained.
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