| 摘要 |
Provided is a light source device that achieves a lower cost and that can be made smaller in terms of the direction of light projection to a fluorescence unit. The light source device comprises a light source main unit (2), an optical element (3), a fluorescence unit (4), and a light condensing element (10). The light axis of the light source main unit (2) and the light axis (11) of the light condensing element (10) are shifted. The reflection direction of light of a first wavelength in a reflection region (14) intersects the incident direction of the light of a first wavelength incident in the reflection region (14). In accordance with the projection of the light of a first wavelength, a fluorescence region (12, 13) emits light of a second wavelength in a direction opposite the incident direction of the light of a first wavelength incident in the reflection region (14), and in the reflection direction of the light of a first wavelength in the reflection region (14). The fluorescence region (12, 13) can reflect the light of a second wavelength incident in the fluorescence region (12, 13). In the optical element (3), the reflection direction of the light of a second wavelength is the same as the direction of the light of a first wavelength that has passed through the optical element (3). |
