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    • 56. 发明授权
    • Illuminator and projector
    • US11614680B2
    • 2023-03-28
    • US17338222
    • 2021-06-03
    • SEIKO EPSON CORPORATION
    • Ryuta Koizumi
    • G03B21/20G03B33/12
    • An illuminator includes a first light emitter that outputs light to a first wavelength band, a first parallelizer parallelizes the first light outputted from the first light emitter, a wavelength converter having a first surface on the first light and a second surface converts the first light into second light belonging to a second wavelength band, an optical element reflects one of light to the first and second wavelength bands and transmits the other, a first focusing system between the first parallelizer and the optical element has positive power, a diffuser between the first focusing system and the optical element diffuses the first light that exits the first system, and a second focusing system between the optical element and the wavelength converter has positive power, and the second system has a focal point between the principal point of the second system and the second surface of the wavelength conversion layer.