LIGHT SOURCE DEVICE AND PROJECTION-TYPE DISPLAY DEVICE

摘要

A light source device is provided that can achieve a reduction in size with respect to the direction of irradiation of light to a fluorescent unit as well as a decrease in cost. The light source device (1) is equipped with: light source main body (2), first optical element (3), fluorescent unit (4), and second optical element (5). The first optical element (3) includes first area (13) and second area (14). In response to irradiation of light of a first wavelength that has passed through first area (13), fluorescent unit (4) emits light of a second wavelength toward first area (13). Light of the first wavelength that is reflected at second area (14) is irradiated to second optical element (5). The second optical element (5) emits light of the first wavelength that was irradiated into second optical element (5) in reflection direction (D). The emission position of light of the first wavelength that is emitted from second optical element (5) is located outside virtual space (V1) that extends in the direction opposite to reflection direction (D) from second area (14).

主权项

1. A light source device comprising:
a light source main body that emits light of a first wavelength; a first optical element that includes a first area that transmits light of said first wavelength and reflects light of a second wavelength that differs from said first wavelength and a second area that reflects light of said first wavelength, said first and second areas being provided such that light of said first wavelength that is emitted from said light source main body successively irradiates said first and second areas; a fluorescent unit that emits light of said second wavelength toward said first area in response to irradiation of light of said first wavelength that is transmitted through said first area; and a second optical element into which is irradiated light of said first wavelength that was reflected at said second area;wherein:
said second optical element emits light of said first wavelength, which was irradiated into said second optical element, in the direction of reflection by said first area of light of said second wavelength that was emitted from said fluorescent unit; and the emission position of light of said first wavelength that is emitted from said second optical element is located outside a virtual space that extends in the direction opposite to said direction of reflection from said second area.