Airtight seal structure of low melting point glass to be used in

Details Airtight seal structure of low melting point glass to be used in Airtight seal structure of low melting point glass to be used in

1994-01-28

1996-05-07

Lee, John D.

Optical waveguides

Accessories

Bushing structure

385 99, G02B 6255

Patent

active

055154735

ABSTRACT:
An airtight sealing method for a leading portion of an optical fiber, which provides high airtight sealing effect and is suitable for mass-production, is provided. The airtight seal structure of a leading portion of an optical fiber according to the present invention comprises an optical fiber and a metal pipe having a through-hole for receiving the optical fiber and adapted to connect an inner portion of the leading portion to an outer portion of the leading portion. A pair of glass pipes each having a through-hole receives the optical fiber and adapted to be inserted into the metal pipe. A low melting point glass material is disposed between the glass pipes in the metal pipe and seals the inner and outer portions of the leading portion by filling a space between an inside of the metal pipe and the optical fiber when heated. Particularly, the melting point of the glass pipes is higher than the melting point of the low melting point glass material so that they are sealed by the low melting point glass material and fixedly bonded to an inner wall of the metal pipe when the low melting point glass material becomes molten state by heating.

REFERENCES:
patent: 4826276 (1989-05-01), Abbott et al.
patent: 4902091 (1990-02-01), Althaus et al.
patent: 4904046 (1990-02-01), Paschke et al.
patent: 5127083 (1992-06-01), Ikeda et al.
"Solder Glass Sealed Windows and Fibers", by G. Kreutzmann et al., Schott Glaswerke, Landshut, Germany, 5 pp., No Date.

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