Projection system for projecting a color video picture and transformation optical system for same

US5694180A · kind A · utility

Assignee

• LDT GmbH & Co. Laser-Display-Technologie KG · DE

Inventors

• Christhard Deter · Hermsdorf, DE
• Klaus Hiller · Hermsdorf, DE
• Gunther Elster · Günzburg, DE
• Rolf Ruder · Jena, DE
• Wolfgang Holota · Annaberg-Buchholz, DE

Key dates

• Filing date: May 14, 1996
• Grant date: Dec 2, 1997
• Expiry date: May 14, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/3141
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In a projection system for projecting a video picture composed of picture points on a screen with at least one light source which emits a light bundle and can be varied in intensity and with a deflecting device which deflects the light bundle to illuminate the picture points on the screen, a transformation optical system having at least two stages is arranged between the deflecting device and the screen and is corrected according to the tangent condition so as to be free of distortion. The transformation optical system has at least two optical stages. The first optical stage produces an intermediate image plane which is imaged on the screen by means of the subsequent optical stage (s).