Patent ID: 7681416
Filing Date: 2010-03-23
Classification: C03B

Abstract:
1. A method for producing an optical component of quartz glass, said method comprising: elongating a coaxial arrangement of a core rod and a hollow cylinder of a predetermined length, wherein the arrangement is supplied in vertical orientation to a heating zone and is softened therein zonewise, starting with a lower end thereof, and the component is drawn off downwards from a softened region of the arrangement, the hollow cylinder having an inner bore that is provided with a constriction in the region of its lower end on which the core rod is supported, and wherein a raw cylinder is provided which is longer than the hollow cylinder to be elongated, the method further comprising mechanically machining the raw cylinder so that the raw cylinder has a bore that is mechanically machined to a final dimension, and wherein the raw cylinder bore is heated in a collapsing zone spaced apart from a front end of the raw cylinder at a distance corresponding at least to the length of the hollow cylinder so that the raw cylinder is collapsed in part, and wherein the hollow cylinder is subsequently separated in the region of the collapsing zone.