| 摘要 |
<p>PROBLEM TO BE SOLVED: To lessen an airtight terminal in size by a method, wherein a through- hole provided in a ceramic base is filled up with high-melting metal wire and/or paste, and the ceramic base is burned. SOLUTION: An airtight terminal 10 is composed of a cylindrical base 11 of ceramic provided with four through-holes 11a which extend in an axial direction and four high-melting metal wires 12, inserted into the through-holes 11a and burned to be airtightly sealed up to serve as a continuity part. A recess 11b, where a sensor element is installed is provided in the tip of the base 11, a flat 11c where a signal amplifying integrated circuit is placed is provided in the rear edge, and a flange 11d is provided in the peripheral part. By this setup, an airtight terminal 10 of this constitution can be hermetically sealed up, eliminating each gap between a continuity part formed of high-melting metal and the base 11. Thus the airtight terminal 10 can be lessened in size, and moreover an integrated circuit may be mounted directly on the ceramic base 11 or various electric circuits may be formed directly on the base 11.</p> |
