Front projectors with shorter projection distance start to gain a lot of interest mainly for Educational Market or Interactive Display Board segments. The shorter projection distance is necessary to avoid the user to hit projected image rays and to reduce the necessary volume for the fixed installation of the projector. We have developed very wide angle projection optics with ±80 degrees field angle to allow a projection distance of 425 mm for 85 inches projected image size. The optical system is based on the association of Projection Lens and Concave Mirror offers a 1.1x Zoom feature integrated in the Projection Lens part. In this paper we describe and discuss the opto-mechanical system and its measured performances.
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