| 摘要 |
A projection-type display apparatus including an elliptical condenser mirror having a concave reflecting surface consisting of part of a substantially elliptical surface, a light source arranged near a first focal point of the elliptical surface, a collimator lens having a focal point near a second focal point of the elliptical surface, an optical modulation element array having a lens array on the collimator lens side, in which optical modulation elements each having an area S are two-dimensionally arranged, and a projection lens, wherein the following relations are satisfied: <IMAGE> <IMAGE> (when said light source is arranged perpendicular to the elliptical condenser mirror) <IMAGE> (when said light source is arranged parallel to the elliptical condenser mirror) mu =(B/A)2 (A: major axis, B: minor axis) where L is the length of a light-emitting portion of the light source, mu is the square of a ratio of the minor axis to the major axis of an ellipse of the elliptical condenser mirror, +E,uns f+EE is the focal length of the collimator lens, +E,uns m+EE is the distance between the lens array and an opening portion of the modulation element, and n is the refractive index between the lens array and the modulation element.
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