Patent ID: 7854146
Filing Date: 2010-12-21
Classification: C03B

Abstract:
1. A method for producing an optical component of quartz glass, said method comprising: elongating a first coaxial arrangement of a first core rod and a hollow cylinder structure of a predetermined length, wherein the first coaxial 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, the hollow cylinder structure having an inner bore therein, and in a region of the lower end being provided with a constriction in the inner bore on which the first core rod is supported, wherein a) a first upper hollow cylinder is fused at an end thereof with a second lower hollow cylinder so as to form the hollow cylinder structure as an axial cylinder composite, b) the first core rod is introduced into the lower hollow cylinder and the axial cylinder composite is supplied to the heating zone, starting with a lower end thereof, and is softened therein zonewise and elongated so as to form the optical component, c) a drawing bulb being formed as said axial cylinder composite is softened and elongated, said drawing bulb progressing in the cylinder composite to the first upper hollow cylinder, wherein, within said drawing bulb, the inner bore is collapsed at least in part, so as to produce a second constriction of the inner bore, d) the first upper hollow cylinder is separated at a separation plane in an area of the second constriction therein from the optical component so that the separated first upper hollow cylinder has the second constriction at an end thereof, and e) the first upper hollow cylinder is subsequently combined with a second core rod supported on the second constriction in a second coaxial arrangement, and the second coaxial arrangement is elongated so as to produce a second optical component.