Illumination optical apparatus and projection type display apparatus
View Patent ↗An illumination optical apparatus and a projection type display apparatus capable of enhancing an illumination efficiency; having an ellipsoidal mirror, a light source arranged at a first focal point of the ellipsoidal mirror, a stop arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror, and a positive refractive collimator lens for collimating a light flux emitted from the stop to a parallel light flux. A condition (0.01<L 2 /L 1<0.06 ) is satisfied where, L 1 is a distance from an apex of the ellipsoidal mirror to the second focal point thereof and, L 2 (the light source side is a positive distance) is a distance from the second focal point of the ellipsoidal mirror to the stop.
1. An illumination optical apparatus, comprising:
an ellipsoidal mirror;
a light source arranged at a first focal point of said ellipsoidal mirror;
a stop arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror; and
a positive refractive collimator lens for collimating a light flux emitted from said stop to a parallel light flux, and
wherein the following condition is satisfied:
0.01< L 2/ L 1<0.06
where, L1 is a distance from an apex of said ellipsoidal mirror to the second focal point thereof and,
L2 (the light source side is a positive distance) is a distance from the second focal point of said ellipsoidal mirror to said stop.
2. An illumination optical apparatus as set forth in claim 1 , further comprising:
a first fly-eye lens having a positive refractive power arranged on said collimator lens side;
a second fly-eye lens having a positive refracting power, arranged on the emission side being approximately in parallel with said first fly-eye lens; and
a relay lens system for guiding a light flux from said second fly-eye lens to an illumination surface.
3. An illumination optical apparatus, comprising:
an ellipsoidal mirror;
a light source arranged at a first focal point of said ellipsoidal mirror; and
a rod integrator arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror, and
wherein the following condition is satisfied:
0.01< L 2/ L 1<0.06
where, L1 is a distance from an apex of said ellipsoidal mirror to the second focal point thereof, and
L2 (the light source side is a positive distance) is a distance from the second focal point of said ellipsoidal mirror to an incident surface of said rod integrator.
4. An illumination optical apparatus as set forth in claim 3 , further comprising a relay lens system for guiding a light flux from said rod integrator to an illumination surface.
5. A projection type display apparatus, comprising:
an image display device; and
an illumination optical apparatus for emitting an illumination light to said image display device;
wherein said illumination optical apparatus comprises
an ellipsoidal mirror,
a light source arranged at a first focal point of said ellipsoidal mirror,
a stop arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror,
a positive refractive collimator lens for collimating a light flux emitted from said stop to a parallel light flux,
a first fly-eye lens having a positive refracting power and arranged on said collimator lens side,
a second fly-eye lens having a positive refracting power and arranged on the emission side to be approximately in parallel with said first fly-eye lens, and
a relay lens system for guiding a light flux from said second fly-eye lens to an illumination surface, and
wherein the following condition is satisfied:
0.01< L 2/ L 1<0.06
where, L1 is a distance from an apex of said ellipsoidal mirror to the second focal point thereof, and
L2 (the light source side is a positive distance) is a distance from the second focal point of said ellipsoidal mirror to said stop.
6. A projection type display apparatus, comprising:
an image display device; and
an illumination optical apparatus for irradiating an illumination light to said image display device;
wherein said illumination optical apparatus comprises
an ellipsoidal mirror,
a light source arranged at a first focal point of said ellipsoidal mirror,
a rod integrator arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror, and
a relay lens system for guiding a light flux from said rod integrator to an illumination surface, and
wherein the following condition is satisfied:
0.01< L 2/ L 1<0.06
where, L1 is a distance from an apex of said ellipsoidal mirror to the second focal point thereof, and
L2 (the light source side is a positive distance) is a distance from the second focal point of said ellipsoidal mirror to an incident surface of said rod integrator.