Process and apparatus for elimination of tolerance dependent variations of a selectable spacing between components in optical communication equipment

US4792204A · kind A · utility

Assignees

• Siemens Aktiengesellschaft · DE
• IBM Corporation · US

Inventors

• Heinz Praeur · Munich, DE
• Alfred H. Johnson · Poughkeepsie, US
• Dietmar Schulz · Roßtal, DE
• Peter Pohl · Krailling, DE

Key dates

• Filing date: Jun 8, 1987
• Grant date: Dec 20, 1988
• Expiry date: Jun 8, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/4292
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A process and a device for substantially eliminating tolerance-dependent variations of a preselectable space between the components of an optical communication apparatus is described. U-shaped recesses are provided in a metal casing for pressing in flange-type necks of, for example, optical transmitting and receiving devices. The parallel arranged devices are so spaced from each other that they are not subject to tolerance-dependent variations. For this purpose the metallic necks are coated with a plastic layer, and ribs provided at the lateral walls of the U-shaped recesses dig into the plastic layer. The necks are pressed in precisely at a predetermined spacing by means of a gauge. By the application of varying degrees of pressure when the ribs are pressed in on one side and the other side of the neck, one of the U-shaped recesses can be off-center.