Projection system for projecting a color video picture and...

G - Physics – 02 – B

Patent

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Details

G02B 27/18 (2006.01) G02B 13/00 (2006.01) G03B 21/10 (2006.01) H04N 9/31 (2006.01) H04N 5/74 (2006.01)

Patent

CA 2142715

A projection system for projecting a video image formed of picture elements on a screen (54) has at least one light source (10: 20: 30) of variable intensity that emits a beam of light and a scanning device (44, 46) that scans the beam of light for lighting the picture elements on the screen (54). Transformation optics (50) with at least two stages are arranged between the scanning device (44, 46) and the screen (54), and corrected according to the theorem of the tangent to eliminate optical distortions. The transformation optics in turn have at least two optical stages. The first optical stage generates an intermediate focal plane reproduced on the screen by the subsequent optical stage(s).

Un système de projection sur un écran (54) d'une image vidéo constituée de points d'images comprend au moins une source de lumière (10; 20; 30) à intensité réglable qui émet au moins un faisceau de lumière et un dispositif de balayage (44, 46) qui déplace le faisceau de lumière afin d'éclairer les points d'image sur l'écran (54). Des éléments optiques de transformation (50) à au moins deux étages sont montés entre le dispositif de balayage (44, 46) et l'écran (54) et sont corrigés selon le théorème de la tangente afin d'éliminer des distortions optiques. Les éléments optiques de transformation comprennent à leur tour au moins deux étages optiques. Le premier étage optique génère un plan focal intermédiaire qui est reproduit sur l'écran par le ou les étages optiques ultérieurs.

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