Light source device and projection apparatus

A light source device comprising:

• a first light source configured to emit a first excitation beam;
• a second light source different from the first light source, a second light source configured to emit a second excitation beam;
• a first beam narrowing element configured to narrow the first excitation beam prior to striking an optical combiner;
• a second beam narrowing element configured to narrow the second excitation beam prior to striking the optical combiner;
• the optical combiner configured to:
• reflect or transmit the first excitation beam after narrowing;
• and
• reflect or transmit the second excitation beam after narrowing;
• a first wavelength converter including a first phosphor to which the first excitation beam transmitted through the optical combiner enters and excites the first phosphor to cause the first phosphor to emit a first fluorescent beam proceeding in a first optical path;
• and
• a second wavelength converter including a second phosphor to which the second excitation beam reflected by the optical combiner enters and excites the second phosphor to cause the second phosphor to emit a second fluorescent beam proceeding in a second optical path,
• wherein the optical combiner is at a point at which the first optical path of the first fluorescent beam intersects the second optical path of the second fluorescent beam, and
• the optical combiner is further configured to:
• combine the first fluorescent beam and the second fluorescent beam to generate a flux of a combination of the first fluorescent beam and the second fluorescent beam;
• and
• emit the flux of the combination in one emission direction,
• wherein
• the optical combiner is a dichroic mirror,
• the dichroic mirror has one surface having:
• a first area onto which the first excitation beam strikes;
• and
• a second area onto which the second excitation beam strikes,
• the first part is in the first area,
• the second part is in the second area,
• the first part transmits the first excitation beam,
• the second part reflects the second excitation beam,
• the first excitation beam on the optical combiner has a first major axis of a first spot diameter,
• the second excitation beam on the optical combiner has a second major axis of a second spot diameter, and
• the first major axis and the second major axis are substantially parallel to a boundary face between the first area and the second area.