Feedthrough and method for manufacturing feedthrough

Abstract

To provide a feedthrough and a method for manufacturing the feedthrough that make it possible to achieve high reliability and reduce optical loss of an optical fiber. The feedthrough includes: a sleeve including an upper sleeve portion, a sleeve central portion, and a sleeve lower portion; a guide fitted to at least an inner peripheral surface of the sleeve central portion; an optical fiber inserted through a through hole formed in the sleeve; and a sealing material being formed between the sleeve upper portion and the guide and hermetically sealing a part of the optical fiber to a sealing groove communicating with the through hole. In the sleeve, a thermal conductivity of the sleeve lower portion is lower than a thermal conductivity of the sleeve upper portion.

Dependencies are inferred from the claim text.