Patent ID: 7086741
Filing Date: 2006-08-08
Classification: G03B

Abstract:
1. An optical system for a projector, comprising: a light source; a projection lens for externally projecting light incident from the light source; an image-forming panel disposed between the light source and the projection lens, and for modulating the light incident at a certain incident angle from the light source, forming an image, and reflecting the formed image onto the projection lens; and a light integrator disposed between the light source and the image-forming panel, wherein the light integrator transforms a cross-sectional face of the light, incident from the light source and radiated onto the image-forming panel at a certain incident angle, into a shape corresponding to the image-forming panel plane so that the cross-sectional face of the light has the same margin width around edges of the image-forming panel plane; wherein the light integrator reduces the shape of the cross-sectional face of the light, which is incident from the light source and which is radiated onto the image-forming panel at a certain incident angle, in proportion to cos θ with respect to the original shape of the cross-sectional face of the light in the direction of a keystone vector formed on the image-forming panel; wherein the incident angle of the light incident onto the image-forming panel is θ; wherein the light integrator comprises a parallelogram shaped cross-sectional face, wherein a width of the cross-sectional face in the direction of the keystone vector is configured to be reduced as a result of multiplying an original width of the cross-sectional face by a value of cos θ.