Light source apparatus and projection display apparatus

1. A light source apparatus comprising:

a laser light source;

a phosphor wheel which includes phosphor formed in an annular shape;

a split mirror configured to split an emission light from the laser light source into a first light path not passing through the phosphor wheel and a second light path passing through the phosphor wheel; and

a multiplexing reflection mirror having a first surface on which a partial reflection coating having a predetermined reflectance is formed, and a second surface on which a total reflection coating is formed, the first surface and the second surface being opposite to each other and formed in a parallel flat shape,

wherein the multiplexing reflection mirror is disposed on the first light path and disposed so as to incline toward an optical path of the emission light from the laser light source such that the emission light is incident on the first surface.

2. The light source apparatus according to claim 1 , further comprising a diffusing element which diffuses the emission light from the laser light source.

3. The light source apparatus according to claim 2 , wherein the multiplexing reflection mirror is disposed on an optical path, immediately before the diffusing element, of the emission light from the laser light source.

4. The light source apparatus according to claim 2 , further comprising a light condenser configured to focus the emission light from the laser light source on the diffusing element,

wherein the light condenser is disposed between the laser light source and the multiplexing mirror.

5. The light source apparatus according to claim 1 , wherein the predetermined reflectance falls within a range from 25% to 50%.

6. A projection display apparatus comprising the light source apparatus according to claim 1 .

7. The light source apparatus according to claim 1 , wherein the second light path passes through blue light.