Light source device and projection display apparatus

A light source device utilizing excitation light to emit fluorescence, the light source device comprising:

• an excitation light source for emitting the excitation light;
• a fluorescent plate in which a substrate has a surface to which a fluorescent material is applied;
• a first optical system configured to optically guide, to a light combining section, fluorescence emitted in a first direction by the excitation light being applied to the fluorescent material;
• and
• a second optical system configured to optically guide, to the light combining section, fluorescence emitted in a second direction by the excitation light being applied to the fluorescent material;
• wherein
• the first direction in which the fluorescence is emitted by the first optical system is a direction in which light is reflected as the fluorescence by the excitation light emitted from the excitation light source being incident, and
• the second direction in which the fluorescence is emitted by the second optical system is a direction in which the excitation light that is emitted from the excitation light source and is incident is transmitted.

A light source device utilizing excitation light to emit fluorescence, the light source device comprising:

• an excitation light source for emitting the excitation light;
• a fluorescent plate in which a substrate has a surface to which a fluorescent material is applied;
• a first optical system configured to optically guide, to a light combining section, fluorescence emitted in a first direction by the excitation light being applied to the fluorescent material;
• and
• a second optical system configured to optically guide, to the light combining section, fluorescence emitted in a second direction by the excitation light being applied to the fluorescent material;
• wherein
• the excitation light source includes a first light source and a second light source,
• the first direction in which the fluorescence is emitted by the first optical system is a direction in which the excitation light that is emitted from the first light source and is incident is transmitted, and
• the second direction in which the fluorescence is emitted by the second optical system is a direction in which the excitation light that is emitted from the second light source and is incident is transmitted.