Method of spatially moving a projection beam from a video or...

G - Physics – 02 – B

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G02B 26/10 (2006.01) G09B 9/32 (2006.01)

Patent

CA 2269534

In order to move spatially the projection beam (P) from a video or graphics projector, the projection beam (P) which emerges from a light source (1) and is guided via and/or through an optoelectronic image generator (2) and through a projection lens (3) is deflected by means of at least one mirror (4) which can be pivotably displaced about two axes, an X-axis extending in the direction of incidence of the projection beam and a transverse Y-axis. In order to attain perfect correction of the image distortion caused by rotation in spite of the rapid movement of the mirror, the images to be projected from the image generator (2) are further rotated when the mirror (4) is pivotably adjusted about the X-axis in forced coupling with the pivotal adjustment of the mirror in order to compensate any image distortion occurring.

Afin de déplacer spatialement le faisceau de projection (P) d'un projecteur vidéo ou graphique, le faisceau de projection (2) émanant d'une source lumineuse (1) et guidé par l'intermédiaire et/ou à travers un système de production d'images (2) et à travers un objectif de projection (3), est dévié à l'aide d'au moins un miroir (4) déplaçable par pivotement autour de deux axes, un axe des X s'étendant dans le sens d'incidence du faisceau de projection et un axe des Y transversal. Afin de parvenir à une correction parfaite du défaut d'image dû à la rotation, en dépit du mouvement rapide du miroir, les images du système de production d'images (2) à projeter sont l'objet d'une rotation supplémentaire, lorsque le miroir (4) est déplacé par pivotement autour de l'axe des X en couplage forcé avec le déplacement par pivotement du miroir, afin de compenser le défaut d'image intervenant.

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