Light source device and heating system including light source device

A heating system comprising:

• a conveying device configured to convey a heating target in a first direction;
• and
• a heating module configured to emit a heating laser light toward the conveying device, wherein
• the heating module comprises a plurality of the light source devices comprising:
• a first laser light source configured to emit a first laser light;
• a second laser light source configured to emit a second laser light;
• a third laser light source configured to emit a third laser light;
• a fourth laser light source configured to emit a fourth laser light;
• a condenser lens;
• a first reflecting surface located at a first distance along an optical axis of the condenser lens from the condenser lens such that a reflection direction of the first laser light is directed toward the condenser lens along the optical axis;
• a second reflecting surface located at a second distance along the optical axis from the condenser lens such that a reflection direction of the second laser light is directed toward the condenser lens along the optical axis;
• a third reflecting surface located at a third distance along the optical axis from the condenser lens such that a reflection direction of the third laser light is directed toward the condenser lens along the optical axis;
• a fourth reflecting surface located at a fourth distance along the optical axis from the condenser lens such that a reflection direction of the fourth laser light is directed toward the condenser lens along the optical axis;
• a first afocal system disposed on a first optical path from the first laser light source to the first reflecting surface such that the first laser light exits toward the first reflecting surface;
• a second afocal system disposed on a second optical path from the second laser light source to the second reflecting surface such that the second laser light exits toward the second reflecting surface;
• a third afocal system disposed on a third optical path from the third laser light source to the third reflecting surface such that the third laser light exits toward the third reflecting surface;
• a fourth afocal system disposed on a fourth optical path from the fourth laser light source to the fourth reflecting surface such that the fourth laser light exits toward the fourth reflecting surface;
• a first substrate supporting the first laser light source and the second laser light source;
• and
• a second substrate supporting the third laser light source and the fourth laser light source on a side opposite to the first substrate with respect to the optical axis,
• wherein, when a plan view taken in a direction along the optical axis is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant with a position of the optical axis serving as an origin, the first reflecting surface is located in the first quadrant, the second reflecting surface is located in the second quadrant, the third reflecting surface is located in the third quadrant, and the fourth reflecting surface is located in the fourth quadrant,
• the heating module is disposed in the first direction, and
• the plurality of light source devices are arranged in the first direction such that short-side directions of the first substrate and the second substrate coincide with a direction perpendicular to a direction of the optical axis in a plan view perpendicular to the first direction.

A light source device comprising:

• a first laser light source configured to emit a first laser light;
• a second laser light source configured to emit a second laser light;
• a third laser light source configured to emit a third laser light;
• a fourth laser light source configured to emit a fourth laser light;
• a condenser lens;
• a first reflecting surface located at a first distance along an optical axis of the condenser lens from the condenser lens such that a reflection direction of the first laser light is directed toward the condenser lens along the optical axis;
• a second reflecting surface located at a second distance along the optical axis from the condenser lens such that a reflection direction of the second laser light is directed toward the condenser lens along the optical axis;
• a third reflecting surface located at a third distance along the optical axis from the condenser lens such that a reflection direction of the third laser light is directed toward the condenser lens along the optical axis;
• a fourth reflecting surface located at a fourth distance along the optical axis from the condenser lens such that a reflection direction of the fourth laser light is directed toward the condenser lens along the optical axis;
• a first afocal system disposed on a first optical path from the first laser light source to the first reflecting surface such that the first laser light exits toward the first reflecting surface;
• a second afocal system disposed on a second optical path from the second laser light source to the second reflecting surface such that the second laser light exits toward the second reflecting surface;
• a third afocal system disposed on a third optical path from the third laser light source to the third reflecting surface such that the third laser light exits toward the third reflecting surface;
• and
• a fourth afocal system disposed on a fourth optical path from the fourth laser light source to the fourth reflecting surface such that the fourth laser light exits toward the fourth reflecting surface,
• wherein, when a plan view taken in a direction along the optical axis is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant with a position of the optical axis serving as an origin, the first reflecting surface is located in the first quadrant, the second reflecting surface is located in the second quadrant, the third reflecting surface is located in the third quadrant, and the fourth reflecting surface is located in the fourth quadrant, and
• wherein the second quadrant is located distant from the first quadrant in a certain direction, the third quadrant is located distant from the second quadrant in another direction intersecting the certain direction, the fourth quadrant is located distant from the third quadrant in an opposite direction to the certain direction, and the first quadrant is located distant from the fourth quadrant in an opposite direction to the another direction.