Light separation and recombination system for an off-axis...

H - Electricity – 04 – N

Patent

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H04N 9/31 (2006.01)

Patent

CA 2305511

A color separation and recombination system separates a beam of white light traveling along an optical axis into three differently colored light beams. The system then independently modulates each colored beam and recombines the colored beams to create a color image. The system includes a crossed pair of dichroic filters to separate the beam of white light and to recombine the modulated bundles. The system also includes a pair of aberration-compensating elements that equalize the optical thickness of glass through which each light bundle passes. This equalization of optical thickness equalizes the aberration induced into each bundle. In another embodiment the beam of white light is polarized before separation. The polarities of the colored light beams are then modulated using a spatial light modulator. An analyzer and half-wave plate are provided between the spatial light modulator and the crossed dichroic filters to pass only a portion of the modulated light. The half-wave plate ensures that the modulated light incident on the crossed dichroic filters is of the same polarity as was the polarized white light separated by the crossed dichroic filters.

Ce système de séparation et de recombinaison de couleurs sépare un faisceau de lumière blanche circulant le long d'un axe optique, en trois faisceaux de lumière colorés différemment, puis il module de manière indépendante chaque faisceau coloré et recombine les faisceaux colorés pour créer une image couleur. Ce système comprend une paire croisée de filtres dichroïques, destinés à séparer le faisceau de lumière blanche et à recombiner les faisceaux modulés, ainsi qu'une paire d'éléments de compensation des aberrations, lesquels égalisent l'épaisseur optique du verre à travers lequel chaque faisceau lumineux passe. Cette égalisation de l'épaisseur optique égalise l'aberration induite dans chaque faisceau. Dans un autre mode de réalisation, le faisceau de lumière blanche est polarisé avant séparation. Les polarités des faisceaux lumineux colorés sont ensuite modulées à l'aide d'un modulateur spatial de lumière. Un analyseur et une lame demi-onde sont montés entre ce modulateur et les filtres dichroïques croisés, afin de ne laisser passer qu'une portion de la lumière modulée. La lame demi-onde permet que la lumière modulée, incidente sur les filtres dichroïques, ait la même polarité que la lumière blanche polarisée, séparée par ces filtres.

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