Method for production of an optical component made from quartz glass

US7681416B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Oliver Ganz · Könnern, DE
• Rene Sowa · Bitterfeld-Wolfen, DE
• Peter Bauer · Siegburg, DE
• Norbert Cibis · Alzenau, DE
• Ralph Sattmann · Hanau, DE
• Jan Vydra · Hanau, DE
• Clemens Schmitt · Walldürn, DE

Key dates

• Filing date: Jul 18, 2004
• Grant date: Mar 23, 2010
• Expiry date: Jun 16, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2205/14
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The production of an optical component from quartz glass, by elongation of a coaxial arrangement of a core rod and a hollow cylinder of a given length, is known. The arrangement is thus introduced into a heating zone with a vertical orientation, such that the lower end begins to partly soften and the component is drawn downwards from the softened part. The hollow cylinder has an inner passage, provided with a restriction in the region of the lower end thereof, on which the core rod is supported. Several methods are disclosed for formation of the restriction in which the inner passage (55) is mechanically machined to a final dimension and, in one version of the method, the restriction in the inner passage (55) is generated by means of softening the lower end face of the hollow cylinder, swaged against a tool and thus folded inwards with formation of a peripheral bead ring.