Optical transmission element

US5031996A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Helmut Saller · Munich, DE
• Guenther Weber · Altötting, DE
• Gisela Ettenberger · Munich, DE
• Heinz Diermeier · Munich, DE

Key dates

• Filing date: Mar 29, 1990
• Grant date: Jul 16, 1991
• Expiry date: Mar 29, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/4402
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical transmission element that has an oil-containing filling compound and inside is provided with a two-layer outside sheath. The inside layer of the sheath is composed of a polyolefin and the outside layer is composed of a polyester, particularly of a polycarbonate. The shrinkage and swelling of the inside layer is largely compensated by the hard outside layer and the swelling portion, which usually appear at higher temperature, are kept extremely low.