Patent ID: 10156780

Abstract:
The phosphor wheel device includes a phosphor wheel, a circulation fan, a motor and a casing unit. The phosphor wheel is disc-shaped, and includes an annular phosphor layer formed on a first face and a plurality of openings disposed on an inner circumferential side. The circulation fan is mounted to a second face opposite to the first face, and blows air through the openings to the phosphor layer side. The motor drives and rotates the phosphor wheel and the circulation fan. The casing unit accommodates the phosphor wheel, the circulation fan, and the motor, and includes a circulation path formed for an airflow generated by the circulation fan to circulate. The casing unit includes an outer cylindrical portion and an inner cylindrical portion disposed substantially concentrically inside the outer cylindrical portion. Both ends of the outer cylindrical portion communicate with both ends of the inner cylindrical portion.