Wide-angle projection lens and optical engine for a...

G - Physics – 02 – B

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G02B 13/06 (2006.01) G02B 13/04 (2006.01) G02B 13/18 (2006.01) G03B 21/30 (2006.01)

Patent

CA 2547443

A wide-angle projection lens is incorporated in an optical engine for use in a short throw distance, front projection display system for a variety of applications. The front projection display device includes an optical engine including an illumination system, an imaging system, and the wide-angle projection lens. The wide-angle projection lens includes a first lens group of negative refractive power that has at least one aspheric surface. The wide- angle projection lens outputs an image at a half field angle of at least 45~, where the image has substantially no distortion. For example, when the first lens group is placed at a distance of less than 1 meter from a viewing screen, the output image has a size of about 40 inches diagonal or greater, and requires substantially no keystone correction. In other aspects, the optical engine can be implemented in a wall-mounted projection wide-angle projection lens is incorporated in an optical engine for use in a short throw distance, front projection display system for a variety of applications. The front projection display device includes an optical engine including an illumination system, an imaging system, and the wide-angle projection.

L'invention concerne un objectif de projection grand-angle incorporé dans un moteur optique destiné à être utilisé à courte distance, ainsi qu'un système d'affichage par projection frontale destiné à diverses applications. Le dispositif d'affichage par projection frontale comprend un moteur optique doté d'un système d'éclairage, d'un système d'imagerie et dudit objectif de projection grand-angle. Cet objectif comprend un premier groupe de lentilles à réfringence négative, comportant au moins une surface asphérique. L'objectif de projection grand-angle émet une image à un angle de demi-champ d'au moins 45·, l'image ne présentant sensiblement pas de distorsion. Par exemple, lorsque le premier groupe de lentilles est placé à une distance inférieure à 1 mètre d'un écran de visualisation, l'image émise présente une taille en diagonal d'environ 40 pouces ou supérieure et ne nécessite sensiblement pas de correction du trapèze. Dans d'autres aspects, le moteur optique peut être mis en oeuvre dans un système de projection mural, un système multimédia, un système de moniteur intégré compact et une unité de projection portable.

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