Light source device and projection display apparatus

A light source device comprising:

• a first laser light source unit and a second laser light source unit disposed face-to-face, each of the first laser light source unit and the second laser light source unit comprising a plurality of laser light sources arranged in an array;
• a first reflective member configured to be disposed diagonally with respect to light emitted from the first laser light source unit and from the second laser light source unit, the first reflective member being configured to reflect the light;
• a third laser light source unit and a fourth laser light source unit disposed face-to-face, each of the third laser light source unit and the fourth laser light source unit comprising a plurality of laser light sources arranged in an array;
• a second reflective member configured to be disposed diagonally with respect to light emitted from the third laser light source unit and from the fourth laser light source unit, the second reflective member being configured to reflect the light;
• and
• a returning reflective member configured to reflect the light that is emitted from the second laser light source unit and is reflected by the first reflective member, and the light that is emitted from the fourth laser light source unit and is reflected by the second reflective member,
• wherein
• following types of light are parallel to one another and in an identical direction of travel:
• the light emitted from the first laser light source unit and reflected by the first reflective member;
• the light emitted from the second laser light source unit and reflected by the returning reflective member;
• the light emitted from the third laser light source unit and reflected by the second reflective member;
• and
• the light emitted from the fourth laser light source unit and reflected by the returning reflective member, and
• the second reflective member is disposed on a path of the light from the first reflective member to the returning reflective member, the light being emitted from the second laser light source unit.