Patent ID: 8872208

Claim:
A light source device, comprising: a light source configured to emit light of a predetermined wavelength within a wavelength region covering the wavelength of ultraviolet light and the wavelength of visible light; a wavelength conversion layer including a wavelength conversion material of at least one type that is excited by excitation light from the light source to emit fluorescent light of a wavelength longer than the wavelength of light emitted from the light source, the light source and the wavelength conversion layer being spaced from each other, the light source device employing a reflection system of extracting at least fluorescent light from an incident surface of the wavelength conversion layer through which excitation light from the light source enters the wavelength conversion layer, the wavelength conversion layer having a surface structure with at least one of depressions and projections; a heat dissipation substrate having light reflectivity heat conductivity; and a connecting part configured to connect the wavelength conversion layer to the heat dissipation substrate.