Patent ID: 9541820
Date: 2017-01-10
CPC Classifications: G03B

Claim:
1. A light source unit comprising: a solid light emitting element that emits light in the blue wavelength range; a luminous light emitting portion on which a luminescent material layer is laid out, the luminescent material layer using the light emitted from the solid light emitting element as excitation light to emit light in a wavelength range of which wavelengths are longer than a wavelength of the excitation light; and a light transmitting portion that transmits the light emitted from the solid light emitting element, the transmitting portion being provided at a different position than the luminous light emitting portion; wherein: an area of a luminescent material that emits luminous light in the green wavelength range is provided at part of the light transmitting portion; the transmitting portion comprises a transparent member; and the light source unit further comprises: an optical plate on which the luminous light emitting portion and another transmitting portion that is different from the transmitting portion are provided in an end-to-end fashion in the circumferential direction, the optical plate being disposed so that the luminous light emitting portion or said another transmitting portion is positioned on an optical path of the light emitted from the solid light emitting element; and a wavelength range adding filter that includes areas of the transparent member and the luminescent material layer, the wavelength range adding filter being provided on an optical path of the light in the blue wavelength range that passes through the other said another transmitting portion; a first reflecting mirror that is provided on an optical path of the light in the blue wavelength range that is emitted from the solid light emitting element to pass through said another transmitting portion at a position on the optical path at a first side of the wavelength range adding filter to be between the optical plate and the wavelength range adding filter, wherein the first reflecting mirror cuts off a peak wavelength of the green light that is emitted by the luminescent material; and a second reflecting mirror that is provided on the optical path of the light in the blue wavelength range that is emitted from the solid light emitting element to pass through said another transmitting portion at a position on the optical path on a second side of the wavelength range adding filter opposite from the first side, wherein the second reflecting mirror cuts off the peak wavelength of the green light that is emitted by the luminescent material.