LIGHTING DEVICE AND PROJECTOR

摘要

A lighting device includes a light source that emits a first light flux of a first wavelength band, a fluorescence light emitting element including a phosphor layer which produces, when excited by light of the first wavelength band, light of a second wavelength band, a polarization separation element that has a polarization separation function for light of the first wavelength band and transmits or reflects light of the second wavelength band, a retardation film disposed in an optical path between the polarization separation element and the phosphor layer, a first reflector disposed in an optical path between the retardation film and the phosphor layer, and a second reflector that reflects the light produced by the phosphor layer. The first reflector reflects part of the first light flux toward the polarization separation element, and transmits the other part of the first light flux toward the phosphor layer.

主权项

1. A lighting device comprising:
a light source that emits a first light flux of a first wavelength band; a fluorescence light emitting element including a phosphor layer and a base that supports the phosphor layer, the phosphor layer producing, when excited by light of the first wavelength band, light of a second wavelength band different from the first wavelength band; a polarization separation element that is provided in an optical path between the light source and the phosphor layer, has a polarization separation function for light of the first wavelength band, and transmits or reflects light of the second wavelength band; a retardation film disposed in an optical path between the polarization separation element and the phosphor layer; a first reflector that is disposed in an optical path between the retardation film and the phosphor layer, reflects part of the first light flux toward the polarization separation element, and transmits other part of the first light flux toward the phosphor layer; and a second reflector that is disposed on the opposite side of the phosphor layer to the first reflector and reflects the light produced by the phosphor layer.