| 摘要 |
PROBLEM TO BE SOLVED: To simplify a production process by providing satisfactory air-tightness due to press-fitting without using plating processing or the like by smoothly finishing the inner surface of a sealed tube through chemical treatment. SOLUTION: A crystal oscillator 4 is assembled from two leads 5 and held on an air-tight terminal 2. Concerning the outer peripheral face of the air-tight terminal 2, copper plating is performed onto the base, and solder plating 3 of soft plating is performed onto it. A sealed tube 1 is composed of the deep drawing press working mold of any one of 42Ni, german silver, stainless, aluminum and kover and the crystal oscillator is sealed air-tightly by press-fitting the sealed tube 1 into the planting part 3 of the assembled air-tight terminal 2. In this case, before the press-worked sealed tube 1 is press-fitted, it is immersed in the mixed acid solution of 19% nitric acid, 40% sulfric acid, 1% hydrochloric acid and 40% water for about one minute so that it can be finished into smooth plane by chemically treating the flaw, etc., having the depth of about 3μm generated on the inner face by press-working. Even without performing the plating processing onto the sealed tube 1, no leakage is generated by press-fitting.
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