Patent ID: 9332895
Filing Date: 2016-05-10
CPC Classification: A61B,H01L

Claim Text:
1. A light source apparatus emitting a light of a first specific spectrum band and a light of a second specific spectrum band with a wavelength longer than the first specific spectrum band in a first irradiation mode, and emitting a light of a second irradiation band with a spectrum different from the light emitted in the first irradiation mode, in a second irradiation mode, the light source apparatus comprising: a casing that is opened toward an irradiating direction of the light; a first light emitting element that is provided in the casing, the first light emitting element emitting light in the first irradiation mode and not emitting the light in the second irradiation mode, and a light emission band of the first light emitting element having a portion that overlaps the first specific spectrum band; a first phosphor that is provided in the casing so that the light emitted by the first light emitting element can reach the first phosphor, the first phosphor including the first specific spectrum band in an excitation band thereof, and including the second specific spectrum band in a fluorescence emission band thereof; a second phosphor that is provided in the casing so that the light emitted by the first light emitting element reaches the second phosphor, an excitation intensity of the second phosphor, as compared with an excitation intensity of the first phosphor, being lower in the first specific spectrum band and higher in a second fluorescence excitation band at a short wavelength side in the second irradiation band, and a fluorescence emission band of the second phosphor including the second irradiation band other than the second fluorescence excitation band; and a second light emitting element that is provided in the casing so that light emitted from the second light emitting element can reach the first phosphor and the second phosphor, the second light emitting element emitting the light in the second irradiation mode and not emitting the light in the first irradiation mode, and a light emission band of the second light emitting element being included in the second fluorescence excitation band, wherein the first phosphor is a powder phosphor placed with such a density that the first phosphor uses a part of the light emitted by the first light emitting element as an excitation light, and scatters another part of the light emitted by the first light emitting element and at least a part of the light emitted by the second light emitting element without using the other part of the light emitted by the first light emitting element and at least a part of the light emitted by the second light emitting element as the excitation light, and the second phosphor is a powder phosphor that is placed with such a density that the second phosphor uses a part of the light emitted by the second light emitting element as an excitation light, and scatters another part of the light emitted by the second light emitting element and at least a part of the light emitted by the first light emitting element without using the other part of the light emitted by the second light emitting element and at least a part of the light emitted by the first light emitting element as the excitation light.