HOCHBRECHENDE OPTISCHE GLAESER MIT GERINGER DICHTE FUER FERNTEIL- UND NAHTEIL-BRILLENGLAESER

Optical glasses having high refractive indexes and low specific gravities are provided for use as both distant and near vision spectacle lenses. The glasses consist essentially of low molecular weight cationic oxides, alkali metal oxides and divalent oxides to promote the crystallization stability o...

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Bibliographische Detailangaben
Hauptverfasser:	GLIEMEROTH,GEORG,.DR, GEILER,VOLKMAR, FAULSTICH,MARGA
Format:	Patent
Sprache:	ger
Schlagworte:	ACCESSORIES THEREFOR ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CHECKING-DEVICES CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY CONTACT LENSES FIXED CONSTRUCTIONS GENERATING RANDOM NUMBERS GLASS HANDCUFFS JOINING GLASS TO GLASS OR OTHER MATERIALS KEYS LOCKS METALLURGY MINERAL OR SLAG WOOL OPTICS PHYSICS REGISTERING OR INDICATING THE WORKING OF MACHINES SAFES SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TIME OR ATTENDANCE REGISTERS VOTING OR LOTTERY APPARATUS WINDOW OR DOOR FITTINGS
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Beschreibung
Zusammenfassung:	Optical glasses having high refractive indexes and low specific gravities are provided for use as both distant and near vision spectacle lenses. The glasses consist essentially of low molecular weight cationic oxides, alkali metal oxides and divalent oxides to promote the crystallization stability of the glass. They have good chemical resistance, chemical hardenability and a thermal expansion coefficient between 93 and 99x10-7/ DEG C. in the range of 20 DEG -300 DEG C. Optical lenses can be continuously produced due to the high crystallization stability of the glasses and the resultant spectacle lenses have high dioptric values even with thinner edge or center thicknesses.