Transparent covering having an antireflection coating for signs, in particular for display devices

US4725109A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joachim Wank · Dormagen, DE
• August Hell · Straubing, DE

Key dates

• Filing date: Nov 7, 1985
• Grant date: Feb 16, 1988
• Expiry date: Nov 7, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/115
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A layer (2) of a substance of high refractive index having an optical thickness of ##EQU1## and a layer (3) of a substance of low refractive index having an optical thickness of ##EQU2## as well as a layer (4) of a substance of high refractive index having an optical thickness of ##EQU3## and a layer (5) of a substance of low refractive index having an optical thickness of ##EQU4## are arranged as an antireflection coating on a transparent covering (1) of display devices, the wavelengths .lambda.1 and .lambda.2 being in a ratio of 1:1,5 to 1:3.