LIGHT SOURCE DEVICE

摘要

Provided is a light source device for converting excited light into long-wavelength light having a longer wavelength than the excited light to more efficiently emit the light having a desired wavelength. The light source includes: an excited light source emitting excited light; a wavelength conversion member including a light transmission plate and a wavelength conversion layer formed on the light transmission plate and receiving the excited light from the excited light source and emitting long-wavelength light having a longer wavelength than the excited light, the excited light emitted from the excited light source being incident upon one side of the wavelength conversion layer; a light reflection member provided at one side of the wavelength conversion member and including an excited light transmission window transmitting the excited light; and a filter member provided at the other side of the wavelength conversion member and reflecting the excited light and transmitting the long-wavelength light.