Wide angle projection lens having three groups

Details Wide angle projection lens having three groups Wide angle projection lens having three groups

G - Physics

02

B

G02B 13/04 (2006.01)

Patent

CA 2601382

A wide angle projection lens include a first lens group of negative refractive power that has at least one aspheric surface. The wide angle projection lens can output an image at a half field angle of at least 45~, where the image has substantially no distortion and requires little or no keystone correction. The wide angle projection lens can be part of an optical engine that can be implemented in rear projection or front projection display devices.

L'invention concerne une lentille de projection grand angle comprenant un premier groupe de lentilles à réfringence négative dotées d'une surface asphérique. Ladite lentille de projection grand angle peut émettre une image à un angle de demi-champs d'au moins 45°, l'image ne présentant sensiblement pas de distorsion et nécessitant peu ou pas de correction du trapèze. Cette lentille de projection grand angle peut faire partie d'un moteur optique pouvant être mis en oeuvre dans des dispositifs d'affichage à projection arrière ou à projection frontale.

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