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:
Jan. 27, 2009
Filed:
Dec. 17, 2004
Bernhard Messerschmidt, Jena, DE;
Christian Ruessel, Jena-Cospeda, DE;
Sandra Hornschuh, Jena, DE;
Torsten Possner, Jena, DE;
Ulf Possner, Jena, DE;
Bernhard Messerschmidt, Jena, DE;
Christian Ruessel, Jena-Cospeda, DE;
Sandra Hornschuh, Jena, DE;
Torsten Possner, Jena, DE;
Ulf Possner, Jena, DE;
Grintech GmbH, Jena, DE;
Abstract
The invention is directed to an aluminoborosilicate glass containing alkali metals for the production of optical components with refractive index gradients which are generated by ion exchange of monovalent metal ions in a base glass comprising at least silicon oxide, boron oxide, aluminum oxide and an alkali metal oxide, particularly for the production of gradient index lenses (GRIN lenses). The object of the invention, to find a novel possibility for producing GRIN lenses based on aluminoborosilicate glasses in which the glass has an appreciably reduced tendency toward crystallization in subsequent thermal treatment processes, is met according to the invention in an alkali-containing aluminoborosilicate glass for the production of optical components with refractive index gradients generated by ion exchange of monovalent, refractive index-changing metal ions in a base glass of SiO, AlO, a metal-(III)-oxide (of B and/or Ga) and at least one metal-(I)-oxide (of Li, Na, K and/or Rb) in that defined molar ratios of metal-(III)-oxides to the metal-(I)-oxides of the base glass are adjusted within a given range in order to appreciably reduce the tendency toward crystallization of the glass for subsequent thermal treatment processes. Point defects caused by crystallites in the GRIN lenses produced in this manner are drastically reduced in this way.