Material with spectrally selective reflection

US7106516B2 · kind B2 · utility

Assignee

• Applied Films GmbH & Co. · DE

Inventors

• Hans-Georg Lotz · Grundau, DE
• Peter Sauer · Schlüchtern, DE

Key dates

• Filing date: Jan 29, 2003
• Grant date: Sep 12, 2006
• Expiry date: Jan 29, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/142
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A material with spectrally selective reflection in the primary valences of red, green and blue is applied preferably onto laser projection screens in order to make possible the projection even in daylight. In a first embodiment, a first layer of a material that is highly reflective over the entire range of visible light, e.g., aluminum is applied onto a substrate, e.g., glass or a synthetic material, followed by a second layer of a material that is essentially non-absorbing over the entire range of visible light, e.g., SiO2. A third layer in contact with air is applied to the second layer and is made of a material that is partially transmissive over the entire range of visible light, e.g., of NiCr An alternative embodiment comprise five layers, The first layer is made a material with a high index of refraction, e.g.; TiO2, a second of a material with a low index of refraction, e.g., SiO2, the third of a material with a high index of refraction, e.g., TiO2: a fourth of a material with a low index of refraction. e.g., SiO2, and a fifth layer of a material with a high index of refraction, e.g., TiO2.