The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2010
Filed:
Jun. 02, 2004
Heinz Fabian, Grossostheim, DE;
Heinz Fabian, Grossostheim, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
The aim of the invention is to improve a known quartz glass cylinder for the production of an optical component, comprising an inner drilling, which is mechanically machined to size and provided with an etched structure by means of an etching treatment, subsequent to the mechanical machining, such that in the application thereof for production of pre-forms and optical fibers, few bubbles arise along the boundary surface between core and sleeve. Said aim is achieved, whereby the etched structure comprises striations with a maximum depth of 2.0 mm and a maximum width of 100 μm. A method for production of such a quartz glass cylinder mechanically machined to size is characterized in that the mechanical machining comprises several serial removal processes with successively lower removal depths, whereby after the last removal process the inner drilling has sub-surface striations with a maximum depth of 2 mm and the inner drilling is subsequently subjected to an etching treatment such that an etching removal with a maximum depth of 50 μm is achieved.