Optically active color filter

US7170679B2 · kind B2 · utility

Assignee

• Vision Quest Lighting, Inc. · US

Inventors

• Torrey M. Bievenour · Stony Brook, US
• Lawrence Lieberman · Hartsdale, US

Key dates

• Filing date: Sep 18, 2003
• Grant date: Jan 30, 2007
• Expiry date: Sep 18, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/24
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optically active color filter for controlling the color of light produced by a light source. The color filter includes an optically active device positioned between a linear polarizer and an adjustable position linear polarizer whose orientation can be controlled mechanically or electrically. In a preferred embodiment, the optically active device contains a liquid optically active substance such as high maltose corn syrup. The optically active color filter may be used for controlling the color of a light source such as a stage light or spotlight and in other applications requiring a device for controlling the color of a light source.