PHOSPHOR WHEEL

To provide a phosphor wheel which enables improvement of the efficiency of light condensation.SOLUTION: The phosphor wheel comprises: a first light-emitting unit reflecting incident light of a first wavelength and emitting emission light of the first wavelength; and a second light-emitting unit converting the wavelength of the incident light of the first wavelength and emitting emission light of a second wavelength. The first light-emitting unit includes a reflection surface that reflects the incident light of the first wavelength as reflected light of the first wavelength, and the second light-emitting unit includes a phosphor layer and a basal surface that is an interface with the lowermost portion of the phosphor layer. The phosphor layer is formed having a prescribed thickness on top of the basal surface and converts the wavelength of the incident light of the first wavelength into light of the second wavelength. The height of the reflection surface is higher than the height of the basal surface when the emission direction of the emission light is upward.SELECTED DRAWING: Figure 6 【課題】集光効率を向上させることが可能な蛍光体ホイールを提供すること。【解決手段】蛍光体ホイールは、第１波長の入射光を反射して前記第１波長の出射光を出射する第１発光部と、前記第１波長の入射光の波長を変換して第２波長の出射光を出射する第２発光部と、を備え、前記第１発光部は、前記第１波長の入射光を前記第１波長の反射光として反射する反射面を備え、前記第２発光部は、蛍光体層と、当該蛍光体層の最下部との界面である基底面とを備え、前記蛍光体層は、前記基底面の上に所定の厚さを有して形成され、前記第１波長の入射光の波長を前記第２波長の光に変換し、前記出射光の出射方向を上方として、前記反射面の高さは前記基底面の高さよりも高い。【選択図】図６