| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-reliability airtight terminal that prevents a crack, a fracture and the like of an insulating base from occurring effectively and is capable of fixing a lead pin on the insulating base securely. SOLUTION: This airtight terminal has a through-hole 1a and comprises an insulating base 1 that is coated with a metallic layer 6 from the circumferential surface area of the through-hole 1a to inside the through-hole 1a, a metallic sleeve 3 that is placed on the periphery of the insulating base 1, and a lead pin 2 that is inserted into the through-hole 1a of the insulating base 1 with both its ends protruded and is attached to the metallic layer 6 by means of brazing. The length of the metallic layer 6 inside the through-hole is in the range of 200μm to 5 mm.
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