Patent ID: 8696133
Filing Date: 2014-04-15
Classification: G02B

Abstract:
1. A projection optical system for directing image light from a display element to a projection surface, comprising: a relay optical system which relays the image light to form an intermediary image of a display image on the display element; a polarization splitting element which polarization-splits the image light emerging from the relay optical system to form two intermediary images as said intermediary image; and two projection lenses which project the two intermediary images on an enlarged scale onto the projection surface so that the images are substantially overlaid together on the projection surface wherein the relay optical system is substantially telecentric both to a display-element side and to a projection-surface side, and if an absolute value of a magnification of the relay optical system be β, an equivalent aerial distance from an entrance surface of a most display-element-side lens to a display element surface be La, and an equivalent aerial distance from an exit surface of a most projection-surface-side lens to the intermediary image be Lb, then a formula is fulfilled.