Colour projector

H - Electricity – 04 – N

Patent

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Details

H04N 5/74 (2006.01) G02B 6/06 (2006.01) G02B 26/08 (2006.01) H04N 9/31 (2006.01)

Patent

CA 2469590

In a projector using a digital image generator of rectangular form, such as a DMD, the input light beam striking the image generator defines a beam section of greater sectional area than an intended circular beam, so as to increase the number of digital elements of the image generator contributing to the light beam output. An optical arrangement, such as a mask, defines the beam section, which may be elliptical, or pin-cushion like, rather than circular. A lens, or other optical component, corrects the beam shape produced by the mask to the circular beam shape. Alternatively, a fibre-optic bundle replaces the mask and lens arrangement.

La présente invention concerne un projecteur utilisant un générateur d'image numérique de forme rectangulaire, tel qu'un DMD. Selon cette invention, le faisceau lumineux d'entrée qui frappe le générateur d'image définit une section de faisceau de plus grande surface de coupe qu'un faisceau circulaire voulu, de façon à augmenter le nombre d'éléments numériques du générateur d'image participant à la sortie du faisceau lumineux. Un ensemble optique, tel qu'un masque, définit la section de faisceau, qui peut être elliptique ou de type coussin, plutôt que circulaire. Une lentille ou un autre composant optique corrige la forme du faisceau produit par le masque pour lui donner la forme de faisceau circulaire. En variante, un faisceau de fibres optiques remplace l'ensemble masque et lentille.

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