Optical unit including an integrator optical system, and projection display device including the optical unit
Provided is an optical unit that includes: light source ( 1 a ); light source ( 1 b ) located to face light source ( 1 a ); color wheel ( 2 ) located between light sources ( 1 a and 1 b ); prism unit ( 3 a ) that totally reflects light emitted from light source ( 1 a ) and that is transmitted through color wheel ( 2 ), and transmits light emitted from light source ( 1 b ) to enter color wheel ( 2 ); and prism unit ( 3 b ) that totally reflects the light emitted from light source ( 1 b ) and that is transmitted through color wheel ( 2 ), and transmits the light emitted from light source ( 1 a ) to enter color wheel ( 2 ).
1. An optical unit comprising:
a first light source;
a second light source located to face the first light source;
a color wheel located between the first light source and the second light source;
a first optical path conversion unit that totally reflects light emitted from the first light source and transmitted through the color wheel, and that transmits light emitted from the second light source to enter the color wheel;
a second optical path conversion unit that totally reflects the light emitted from the second light source and transmitted through the color wheel, and that transmits the light emitted from the first light source to enter the color wheel; and
an integrator optical system that makes uniform luminance distributions of the light totally reflected by the first optical path conversion unit and the light totally reflected by the second optical path conversion unit,
wherein the integrator optical system includes a first integrator optical system into which the light that is totally reflected by the first optical path conversion unit enters, and a second integrator optical system into which the light that is totally reflected by the second optical path conversion unit enters, and
wherein the first optical path conversion unit and the first integrator optical system are integrally formed, and the second optical path conversion unit and the second integrator optical system are integrally formed.
2. The optical unit according to claim 1 , wherein each of the integrator optical systems includes a rod lens.
3. The optical unit according to claim 1 , wherein each of the integrator optical systems includes a fly-eye lens.
4. A projection display device comprising:
the optical unit specified in claim 1 ;
an image forming element that modulates light applied from the optical unit based on an image signal; and
a projection optical system that projects the light modulated by the image forming element.
5. The optical unit according to claim 2 , wherein a side face of the rod lens is mirror-coated.
6. The projection display device according to claim 4 , wherein the image forming element comprises a DMD.