Patent ID: 6715880
Filing Date: 2004-04-06
Classification: G02B,H04N

Abstract:
A projector device comprising:an illuminating optical system having a rod integrator constructed of a transparent prism-shaped member and having a rectangular cross section to condense light emitted from a light source, a relay lens through which said light fed from said rod integrator passes, a reflecting mirror through which said light fed from said relay lens passes, a reflecting prism through which said light fed from said reflecting mirror passes, a color prism through which said light fed from said reflecting prism passes, a digital micromirror device to condense light fed from said color prism, wherein light reflected by said digital micromirror device, after having passed through said color prism, said reflecting prism and a projection lens, is projected onto a screen and wherein said rod integrator includes at least one notch or a protruded portion, said at least one notch or protruded portion formed on a lengthwise side or sides of said rod integrator in a vicinity of a light incident face and on a lengthwise side or sides in a vicinity of a light outgoing face, wherein the vertex of the angle of said at least one notch extends past the lengthwise plane of the rod integrator towards the center of the rod integrator, and wherein the vertex of the angle of said protruded portion is located substantially at the lengthwise plane of the rod integrator and wherein the angle of the vertex of the protruded portion is less than 180 degrees and wherein the base of a triangle formed by said vertex of the protruded portion is opposite said vertex of said protruded portion and extends in an oblique direction from said rod integrator, said base not breaking the lengthwise plane of the rod integrator.