Light source apparatus and projection display apparatus

1. A light source apparatus comprising: a light source that emits blue component light; a polarization adjuster that adjusts an entire polarization state of the blue component light emitted from the light source into S-polarization state at a first timing and P-polarization state at a second timing different from the first timing; a separation optical element that separates the blue component light emitted from the light source into a first optical path and a second optical path according to the polarization state adjusted by the polarization adjuster, the first optical path being for using the blue component light as excitation light, the second optical path being for using the blue component light as reference image light; a luminous body provided on the first optical path and that emits reference image light in response to the excitation light; and a combine optical element that combines the first optical path and the second optical path into a single optical path.

2. The light source apparatus according to claim 1 , further comprising a separation/combine optical element that separates the blue component light emitted from the light source into a plurality of optical paths for using the blue component light as the excitation light and that combines a plurality of optical paths of the reference image light emitted in response to the excitation light into a single optical path.

3. The light source apparatus according to claim 1 , wherein the luminous body is provided on a rotary body provided on the first optical path.

4. A projection display apparatus comprising: a light source that emits blue component light; a polarization adjuster that adjusts an entire polarization state of the blue component light emitted from the light source into S-polarization state at a first timing and P-polarization state at a second timing different from the first timing; a separation optical element that separates the blue component light emitted from the light source into a first optical path and a second optical path according to the polarization state adjusted by the polarization adjuster, the first optical path being for using the blue component light as excitation light, the second optical path being for using the blue component light as reference image light; a luminous body provided on the first optical path and that emits reference image light in response to the excitation light; a combine optical element that combines the first optical path and the second optical path into a single optical path; an imager provided on the single optical path and that modulates light emitted from the combine optical element; and a projection unit that projects light emitted from the imager.

5. A projection display apparatus comprising:

a light source that emits blue component light;

a polarization adjuster that adjusts a polarization state of the blue component light emitted from the light source;

a separation optical element that separates the blue component light emitted from the light source into a first optical path and a second optical path according to the polarization state adjusted by the polarization adjuster, the first optical path being for using the blue component light as excitation light, the second optical path being for using the blue component light as reference image light;

an ellipsoidal reflector provided on the first optical path and having a first focal position and a second focal position;

a luminous body that emits reference image light toward the ellipsoidal reflector in response to the excitation light reflected by the ellipsoidal reflector;

a combine optical element that combines the first optical path and the second optical path into a single optical path;

a rod integrator provided on the single optical path and configured to homogenize light, the light being emitted from the combine optical element;

an imager that modulates light emitted from the rod integrator; and

a projection unit that projects light emitted from the imager, wherein

the first focal position is provided closer to the ellipsoidal reflector than the second focal position,

the luminous body is provided at the first focal position, and

a light incident surface of the rod integrator is provided at the second focal position.

6. The projection display apparatus of claim 5 , wherein said polarization adjuster adjusts an entire polarization state of the blue component light emitted from the light source into S-polarization state or P-polarization state according to a timing.